Cutter with laser generator that irradiates cutting position on workpiece to facilitate alignment of blade with cutting position Number:7,367,254 from the United States Patent and Trademark Office (PTO) owispatent A cutter including a base, a holder, a cutter blade portion, and a laser generator. The holder is supported on the base portion in an upright posture. The cutter blade portion supports a moving blade. The cutter blade portion is supported on the holder movable between an upper position and a lower position. The cutter blade portion is moved into the lower position to cut a workpiece supported on the base using the moving blade. The laser generator is attached to the holder or the cutter blade portion in an orientation to direct at least a portion of the laser light onto a position on the workpiece that is directly beneath the cutter blade portion when the cutter blade portion is in the upper position. Alternatively, a holder has a shaft support portion, and a slide shaft is axially slidably supported by the shaft support portion. A front end of the slide shaft has a hinge holder which pivotally supports the cutting blade portion. A laser generator is fixed to a front side of the hinge holder.<H facilitate, irradiates, Cutter, with, las, 7367254.html, Patent, pto, 7367254

Title: Cutter with laser generator that irradiates cutting position on workpiece to facilitate alignment of blade with cutting position

Abstract: A cutter including a base, a holder, a cutter blade portion, and a laser generator. The holder is supported on the base portion in an upright posture. The cutter blade portion supports a moving blade. The cutter blade portion is supported on the holder movable between an upper position and a lower position. The cutter blade portion is moved into the lower position to cut a workpiece supported on the base using the moving blade. The laser generator is attached to the holder or the cutter blade portion in an orientation to direct at least a portion of the laser light onto a position on the workpiece that is directly beneath the cutter blade portion when the cutter blade portion is in the upper position. Alternatively, a holder has a shaft support portion, and a slide shaft is axially slidably supported by the shaft support portion. A front end of the slide shaft has a hinge holder which pivotally supports the cutting blade portion. A laser generator is fixed to a front side of the hinge holder.

Patent Number: 7,367,254 Issued on 05/06/2008 to Ushiwata, et al.

Inventors: Ushiwata; Shigeharu (Hitachinaka, JP), Takano; Shinji (Hitachinaka, JP), Terashima; Hideaki (Hitachinaka, JP), Matsunaga; Kenichi (Hitachinaka, JP), Imamura; Ryuichi (Hitachinaka, JP)
Assignee: Hitachi Koki Co., Ltd. (Tokyo, JP)

Appl. No.: 11/509,759

Filed: August 25, 2006

Related U.S. Patent Documents


Application Number	Filing Date	Patent Number	Issue Date
09930442	Aug., 2001	7207251
09499385	Feb., 2000

Foreign Application Priority Data


Feb 05, 1999 [JP]			P11-28275
Feb 05, 1999 [JP]			P11-28277
Nov 26, 1999 [JP]			P11-335411
Dec 03, 1999 [JP]			P11-344301

Current U.S. Class: 83/520 ; 83/471.3; 83/581

Current International Class: B26D 7/00 (20060101)

Field of Search: 83/521,432,522.14,581,468.3,520 372/107,97

References Cited [Referenced By]

U.S. Patent Documents


2806492	September 1957	Becker
3736402	May 1973	Mefferd et al.
3783404	January 1974	Matsuoka
3787693	January 1974	Stone
3916336	October 1975	Kaiser
4257297	March 1981	Nidbella
4469931	September 1984	Macken
4647155	March 1987	Bjorklund et al.
4665529	May 1987	Baer et al.
4738044	April 1988	Osterhout
4805500	February 1989	Saito et al.
4833782	May 1989	Smith
4856020	August 1989	Ortiz
4885967	December 1989	Bell et al.
4911532	March 1990	Hidaka
4916713	April 1990	Gerber
4939863	July 1990	Alexander et al.
5038481	August 1991	Smith
5056097	October 1991	Meyers
5060548	October 1991	Sato et al.
5177309	January 1993	Willoughby et al.
5285708	February 1994	Bosten
5359779	November 1994	Polk et al.
5373362	December 1994	Kano et al.
5375495	December 1994	Bosten
5446635	August 1995	Jehn
5461790	October 1995	Olstowski
5675899	October 1997	Webb
5996460	December 1999	Waite
6397717	June 2002	Waite
6481322	November 2002	Hsiung
6976764	December 2005	Cheng et al.

Foreign Patent Documents


3406904	Sep., 1984	DE
29616604	Dec., 1996	DE
58-56460	Apr., 1983	JP
61-143116	Sep., 1986	JP
2-32337	Mar., 1987	JP
62-150019	Sep., 1987	JP
6-701	Jan., 1994	JP
10-6934	Jan., 1998	JP
63-92348	Jun., 1998	JP
WO 93/17842	Sep., 1993	WO

Primary Examiner: Ashley; Boyer D.
Assistant Examiner: Sanchez; Omar Flores
Attorney, Agent or Firm: Sughrue Mion, PLLC

Parent Case Text

CROSS REFERENCE TO RELATED APPLICATION

This application is a divisional of U.S. patent application Ser. No. 09/930,442 filed on Aug. 16, 2001 now U.S. Pat. No. 7,207,251, which is a continuation-in-part of U.S. patent application Ser. No. 09/499,385 filed Feb. 7, 2000, now abandoned, and further claims priority based on 35 U.S.C. section 119 to Japanese Patent Application Nos. 11-28275 filed Feb. 5, 1999, 11-28277 filed Feb. 5, 1999, 11-335411 filed Nov. 26, 1999, and 11-344301 filed Dec. 3, 1999. The entire disclosures of the prior applications, Ser. Nos. 09/930,442 and 09/499,385, are hereby incorporated by reference.

Claims

What is claimed is:

1. A cutter comprising: a base portion for supporting a workpiece; a holder supported on the base portion; a cutter blade portion adapted for supporting a circular saw blade that cuts the workpiece, the cutter blade portion being supported on the holder so as to be pivotally movable between an upper position and a lower position, the cutter blade portion being closer to the base portion in the lower position than in the upper position, the circular saw blade having a rotation axis and a blade edge in a circumferential direction of the circular saw blade, the blade edge having a width in a direction of the rotation axis, said width being bounded by two parallel planes; a laser generator, said laser generator including a light emitting portion for emitting a laser light beam plane, the laser generator being provided on the holder at a position higher than a surface of the base and lower than a predetermined position so that the laser light beam plane is formed between the lower edge of the blade and the base when the cutter blade portion is at the upper position; and means for moving the light emitting portion of the laser generator in a longitudinal direction of the rotation axis of the circular saw blade.

2. The cutter as claimed in claim 1, wherein the light emitting portion irradiates the laser light beam plane onto the position to be cut on the workpiece, and the laser generator further comprises: a laser generator support member supporting therein the laser generator.

3. The cutter as claimed in claim 2, wherein the laser generator has a first side and a second side opposite the first side, and the moving means comprises: a screw member screwingly fitted in the laser generator support member with a tip of the screw member abutting against the first side of the laser generator, and a resilient member interposed between the laser generator support member and the second side of the laser generator for urging the laser generator toward the screw member.

4. The cutter as claimed in claim 2, further comprising a resilient body for urging the laser generator in a vertical direction.

5. The cutter as claimed in claim 2, wherein the laser generator support member has a first side wall and a second side wall extending in a vertical direction, and further comprising a first stop member provided to the first side wall and movable in a horizontal direction and a second stop member provided to the second side wall and movable in a horizontal direction for regulating a horizontal movement of the laser generator relative to the laser generator support member.

6. The cutter as claimed in claim 1, wherein the holder is pivotably with respect to the base portion, so that an angle made by the circular saw blade and the base portion is changed when the holder is pivoted with respect to the base portion.

7. The cutter as claimed in claim 1, wherein the holder comprises: a slide shaft support portion; at least one slide shaft extending through the slide shaft support portion and slidably movable in a frontward and a rearward direction with respect to the slide shaft support portion, the at least one slide shaft having a front end; and a hinge holder fixed to the front end of the at least one slide shaft, the hinge holder having a front side, wherein the cutter blade portion is supported on the hinge holder.

8. The cutter as claimed in claim 1, wherein said laser light beam plane travels within a space defined between said two planes and travels in the direction which is perpendicular to the longitudinal direction of the rotation axis of the circular saw blade.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a cutter, such as a tabletop circular saw for cutting wooden boards.

2. Description of the Related Art

There has been known a cutter with a circular blade and a laser generator. The laser generator irradiates the workpiece with a laser light to indicate the position where the cutting is to be performed. The operator then uses the circular blade to cut the workpiece material at the position indicated by the laser light.

Japanese Utility-Model-Application Publication No. SHO-62-150019 discloses a cutter with a blade positioned above a workpiece and a laser generator fixed on the blade support at a position above the blade. Before cutting the workpiece, the user draws a mark on the workpiece to indicate the position on the workpiece to be cut. The user then aligns the laser light emitted from the laser generator with the mark on the workpiece, and lowers the blade to cut the workpiece.

The laser generator disclosed in Japanese Utility-Model-Application Publication No. SHO-62-150019 is fixed at the blade support. Therefore, if the laser light is not actually in alignment with the location that the blade cuts, the user must attempt to compensate for this positional difference by intentionally shifting the laser light out of alignment with the cutting position mark on the workpiece before cutting the workpiece. This increases the possibility that the workpiece will not be cut in the desired cutting position.

West German Patent Publication No. 3406904 discloses a cutter provided with a laser generator mounted on a slide bar. The laser generator can be freely slid horizontally along the slide bar to adjust position where the laser light irradiates the workpiece. However, minute adjustment of where the laser light irradiates the workpiece is difficult with this configuration.

U.S. Pat. Nos. 5,285,708 and 5,375,495 disclose cutters, each having a cutting portion that is disposed above the workpiece, and a laser generator that is disposed above and ahead of the cutting blade. A rail is suspended above the cutting blade so as to extend in a widthwise direction of the cutting blade. A groove is formed in the laser generator to fit in the rail. The laser generator is guided by along the rail so can easily moved in the horizontal direction. However, if the groove in the laser generator and the rail have a poor fit with gaps therebetween, then horizontal movement of the laser generator will be unstable so that the cutting position cannot be accurately indicated using the laser.

Next, a conventional mechanism for adjusting alignment of a laser light with a vertical reference line Y and with a horizontal reference line X will be explained with reference to FIGS. 1 (a) to 3. A cylindrical laser generator 70 is supported in a support member 71 by a fixing screw 72. The fixing screw 72 presses the laser generator 70 downward in the support member 71. The support member 71 is fixed to a base by two bolts 74, 74. One bolt 74 passes through a circular hole 76 and the other bolt 74 passes an elongated hole 77.

As shown in FIGS. 1 (a) and 1 (b), when laser light L1 from the cylindrical laser generator 70 is to be aligned with a vertical reference line Y, the fixing screw 72 is loosened and the cylindrical laser generator 70 is rotated within the support member 71 until the laser light L1 is aligned with the vertical reference line Y. Once alignment is achieved, the fixing screw 72 is retightened to fix the cylindrical laser generator 70 in place in the support member 71.

As shown in FIG. 2, when the laser light L1 is to be aligned with a horizontal reference line X, the bolts 74, 74 are loosened and the support member 71 is pivoted around the circular hole 76 within the horizontal plane. When the laser light L1 is aligned with the horizontal reference line X, then the bolts 74, 74 are tightened to fix the support member 71 in place.

However, because the tip of the fixing screw 72 is not completely flat, the cylindrical laser generator 70 might be moved out of alignment when the fixing screw 72 is tightened. When this happens, the operator must repeat the adjustment process until the laser light L1 is accurately aligned with the vertical reference line Y.

Also, when the bolt 74 is tightened, the support member 71 might move because the contacting surface of the support member 71 or the bolts 74 are slanted. In this case also, the operator must repeat the adjustment process until the laser light L1 is accurately aligned with the horizontal reference line X.

SUMMARY OF THE INVENTION

As shown in FIGS. 4 and 5, normally laser light L1 has a different width W1 than the width W2 cut by the blade. For example, a circular blade 22 with an outer diameter of 255 mm will cut the workpiece to a width W2 of generally 2.5 mm. In contrast, laser light L1 normally has a width W1 of about 0.8 mm. For this reason, an operator could conceivably align the laser light L1 with the cutting position on the workpiece in any of the ways shown in FIGS. 4 to 7 (b). For example, the operator could conceivably align the laser light L1 with the exterior of the left edge of the cutting width as shown in FIGS. 5 and 7 (a), or with the exterior of the right edge of the cutting width as shown in FIG. 7 (b).

Alternatively, the operator could conceivably align the laser light L1 with the interior of the left edge of the blade width W2 as shown in FIGS. 4 and 6 (a), or with the interior of the right edge of the blade width W2 as shown in FIG. 6 (b). However, it is impossible to align the laser light L1 with the interior of the left or right edges of the blade width W2 using the configuration disclosed in U.S. Pat. Nos. 5,285,708 and 5,375,495, because the cutting blade is interposed between the laser generator and the workpiece. If a user attempts to irradiate the workpiece in the manner indicated either in FIG. 6 (a) or 6 (b), that is, with the laser light L1 irradiating the interior of either the left or right edge of the cutting width W2, then the laser light L1 will hit the upper edge of the cutting blade itself, rather than the workpiece. In other words, the cutting blade will block the laser light L1 and prevent the laser light from indicating the cutting position on the workpiece. As a result, the user is only capable of irradiating the workpiece with the laser light in alignment with the exterior of the right or left edge of the cutting width W2.

West German Patent No. DE 29616604 discloses a cutter with a laser generator disposed far from the blade portion. With this configuration, a long extension member must be provided to connect the laser generator with the blade holding member, so that the laser generator is disposed far enough from the blade holding member. This extension member makes gets in the way during cutting operations, and contributes to undesirable overall enlargement of the cutter.

It is an object of the present invention to overcome the above-described problems and to provide a cutter with a laser generator capable of irradiating a desired position on the workpiece with laser light, without interference from the cutter blade.

It is another objective of the present invention to provide a cutter with a laser generator capable of adjusting alignment of emitted laser light in both the horizontal and vertical directions.

It is still another objective of the present invention to provide a cutter with a laser generator wherein width of laser light emitted by the laser generator can be adjusted.

In order to achieve the above-described objectives, a cutter according to one aspect of the present invention includes a base for supporting a workpiece, a holder supported on the base portion in an upright posture, a cutter blade portion, and a laser generator for emitting laser light. The cutter blade portion is adapted for supporting a moving blade that cuts the workpiece. The cutter blade portion is supported on the holder movable between an upper position and a lower position, wherein the cutter blade portion is closer to the base in the lower position than in the upper position.

The laser generator is attached to one of the holder and the cutter blade portion in an orientation to direct at least a portion of the laser light onto a position on the workpiece that is directly beneath the cutter blade portion with respect to the cutter blade portion in the upper position. With this configuration, a desired position to cut the workpiece can be indicated even if the position is directly beneath the cutting blade.

A cutter according to another aspect of the present invention includes a base, a cutter blade portion, a laser generator, a laser generator support member, and means for moving the light emitting portion of the laser generator in a horizontal direction. The laser generator support member supports therein the laser generator slidable in the horizontal direction. The moving means is adapted for moving the light emitting portion of the laser generator in the horizontal direction. With this configuration, the position of the light emitting portion can be easily adjusted in the horizontal direction using a simple moving means such as a screw.

A cutter according to still another aspect of the present invention includes a base, a cutter blade portion, a laser generator, a laser generator support member, a pivot means, first and second regulation members screwingly fitted in the laser generator support member, and first and second resilient means. The pivot means enables the laser generator to pivot horizontally and vertically in the laser generator support member. The first regulation member presses against the laser generator to pivot the laser generator horizontally about the pivot means, and the second regulation member presses against the laser generator to pivot the laser generator vertically about the pivot means. The first and second resilient means urge the laser generator toward the first and second regulation members, respectively. This configuration enables easy adjustment of the laser generator in both vertical and horizontal directions, while eliminating any looseness of fit between the laser generator and the laser generator support member.

A cutter according to a further aspect of the present invention includes a base portion, a cutter blade portion, a laser generator, a convex lens provided in the laser generator, and a lens moving unit. The convex lens is for adjusting the focal point of the laser light emitted by the laser generator. The lens moving unit is for moving the convex lens parallel with optical axis of the laser light emitted from the laser generator to change the width of the laser light. With this configuration, the width of the laser light can be adjusted by merely using the lens moving unit to move the position of the convex lens.

A cutter according to still a further aspect of the present invention includes a base portion, a cutter blade portion, a laser generator, and a movement member. The laser generator has a light emitting portion from which the laser light is emitted, and a stationary wall positioned in front of the light emitting portion. A movable member is disposed in confrontation with the stationary wall and is movable toward and away from the stationary wall for changing a width of the laser light.

A cutter according to still another aspect of the present invention includes a base portion, a holder, a cutter blade portion provided on an upper portion of the holder, a laser generator provided on the holder, and a cleaning mechanism. The cutter blade portion is adapted for free vertical movement toward and away from the base portion between an uppermost position to a lowermost position. The cleaning mechanism contacts a light emitting portion of the laser generator in linking association with vertical movement of the cutter blade portion from the uppermost position to the lowermost position. The cleaning mechanism cleans off the light emitting portion by said contact. With this configuration, the light emitting portion of the laser generator will be automatically cleaned each time the cutter is used to cut a workpiece.

A cutter according to still another aspect of the present invention includes the base, a holder, at least one slide shaft, a hinge holder, a cutter blade portion, and a laser generator. The holder is supported on the base portion in an upright posture, and has a slide shaft support portion. The at least one slide shaft extends through the slide shaft support portion and is slidably movable in a frontward and a rearward direction with respect to the slide shaft support portion. The hinge holder fixed to a front end of the at least one slide shaft. The cutter blade portion is adapted for supporting a moving blade that cuts the workpiece. The cutter blade portion is supported on the hinge holder so as to be movable between an upper position and a lower position. The cutter blade portion is closer to the base in the lower position than in the upper position. The laser generator is adapted for emitting laser light. The laser generator is attached to a front side of the hinge holder in an orientation to direct at least a portion of the laser light onto a position on the workpiece that is directly beneath the cutter blade portion with respect to the cutter blade portion in the upper position.

BRIEF DESCRIPTION OF THE DRAWINGS

The particular features and advantages of the invention as well as other objects will become more apparent from the following description taken in connection with the accompanying drawings, in which:

FIG. 1 (a) is a side view showing a conventional laser unit;

FIG. 1 (b) is a schematic view indicating a laser light out of alignment from a vertical reference line;

FIG. 2 is a top view of the conventional laser unit shown in FIG. 1 (a), with laser light emitted from the laser unit out of alignment with a horizontal reference line;

FIG. 3 is a side view of the conventional laser unit shown in FIG. 1 (a);

FIG. 4 is perspective view showing a workpiece irradiated in a conceivable manner by a laser light along an inner edge of a width to be cut;

FIG. 5 is perspective view showing a workpiece irradiated in a conceivable manner by a laser light along an outer edge of a width to be cut;

FIG. 6 (a) is a schematic view showing a workpiece irradiated in a conceivable manner by a laser light along an inner left edge of a width to be cut;

FIG. 6 (b) is a schematic view showing a workpiece irradiated in a conceivable manner by a laser light along an inner right edge of a width to be cut;

FIG. 7 (a) is a schematic view showing a workpiece irradiated in a conceivable manner by a laser light along an outer left edge of a width to be cut;

FIG. 7 (b) is a schematic view showing a workpiece irradiated in a conceivable manner by a laser light along an outer right edge of a width to be cut;

FIG. 8 is a side view showing a cutter according to a first embodiment of the present invention;

FIG. 9 is a partial view showing the cutter from the rear;

FIG. 10 is a cross-sectional view taken along line X-X of FIG. 8;

FIG. 11 is a partial view showing the cutter from the front;

FIG. 12 is a cross-sectional view showing a laser unit according to the first embodiment, taken along line XII-XII of FIG. 11;

FIG. 13 is a cross-sectional view taken along line XIII-XIII of FIG. 12;

FIG. 14 is a cross-sectional view taken along line XIV-XIV of FIG. 13;

FIG. 15 is a side view showing a modification to the cutter of the first embodiment, the modification including a cleaning mechanism;

FIG. 16 is an enlarged view showing the cleaning mechanism of FIG. 15;

FIG. 17 is an enlarged view showing a brush of the cleaning mechanism moving into contact with a light emitting portion of the laser generator;

FIG. 18 is an enlarged view showing the brush cleaning sawdust off the light emitting portion;

FIG. 19 is a cross-sectional view showing a laser unit according to a second embodiment of the present invention;

FIG. 20 is a cross-sectional view taken along line XX-XX of FIG. 19;

FIG. 21 is a cross-sectional view showing a laser unit according to a third embodiment of the present invention;

FIG. 22 is a cross-sectional view showing a laser unit according to a fourth embodiment of the present invention;

FIG. 23 is a cross-sectional view showing a laser unit according to a fifth embodiment of the present invention;

FIG. 24 is a cross-sectional view showing a laser unit according to a sixth embodiment of the present invention;

FIG. 25 is a cross-sectional view showing a laser unit according to a seventh embodiment of the present invention;

FIG. 26 is a cross-sectional view taken along line XXVI-XXVI of FIG. 25;

FIG. 27 is a cross-sectional view taken along line XXVII-XXVII of FIG. 26;

FIG. 28 (a) is a schematic view showing laser generators according to seventh, eighth, and ninth embodiments of the present invention emitting laser light;

FIG. 28 (b) is a schematic view showing laser light from the laser generators of FIG. 28 (a) out of alignment from a vertical reference line;

FIG. 29 is a schematic view showing a workpiece with the location to be cut indicated by a drawn line;

FIG. 30 is a cross-sectional view showing a laser unit according to an eighth embodiment of the present invention;

FIG. 31 is a cross-sectional view taken along line XXXI-XXXI of FIG. 30;

FIG. 32 is a cross-sectional view taken along line XXXII-XXXII of FIG. 31;

FIG. 33 is a cross-sectional view showing a laser unit according to a ninth embodiment of the present invention;

FIG. 34 is a cross-sectional view taken along line XXXIV-XXXIV of FIG. 33;

FIG. 35 is a cross-sectional view taken along line XXXV-XXXV of FIG. 34;

FIG. 36 is a perspective view showing a laser unit according to a tenth embodiment of the present invention;

FIG. 37 is a cross-sectional view taken along line XXXVII-XXXVII of FIG. 36;

FIG. 38 is a cross-sectional view taken along line XXXVIII-XXXVIII of FIG. 36;

FIG. 39 is a perspective view showing cutting of a workpiece;

FIG. 40 is a perspective view showing a laser unit according to an eleventh embodiment of the present invention with laser light emitted therefrom adjusted to a minimum width;

FIG. 41 is a perspective view showing the laser unit of FIG. 40 with laser light emitted adjusted to a maximum width;

FIG. 42 is a side view showing a cutter according to a twelfth embodiment of the present invention;

FIG. 43 is a side view showing a cutter according to a thirteenth embodiment of the present invention;

FIG. 44 is a front view showing the cutter according to the thirteenth embodiment;

FIG. 45 is a cross-sectional view taken in the direction of an arrow XXXXV of FIG. 46 for showing a shaft support portion of a holder in the cutter according to the thirteenth embodiment; and,

FIG. 46 is partial side view showing a cutting state of the cutter according to the thirteenth embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Cutters according to first through thirteenth embodiments of the present invention will be explained while referring to the accompanying drawings. Unless otherwise noted, orientation terms, such as left, right, front, rear, up, and down, are used with respect to the normal orientation of the device for normal use. The cutters according to the first through eleventh embodiments have substantially the same configuration with exception of components relating to the laser unit. As will be described in more detail later, the laser units of the first through sixth embodiments are configured to enable adjustment in horizontal position of the laser generator. The laser units of the seventh through ninth embodiments include configuration that enables adjustment of the laser generator to align emitted light in the vertical and horizontal directions. The laser units of the tenth and eleventh embodiments are configured to enable adjustment in the width of the laser light emitted from the laser generator. The cutters according to the twelfth and thirteenth embodiments are the modifications to the cutters of the first through eleventh embodiment.

First, a cutter D1 according to the first embodiment will be described while referring to FIGS. 8 to 14. As shown in FIG. 8, the cutter D1 has a base 1, a turntable 2, a fence 3, a holder shaft 4, a holder 10, a clamp lever 5, a shaft 11, a cutter mechanism 20, and a laser unit U. The turntable 2 is supported on the center of the base 1 so as to be freely rotatable horizontally. The upper surface of the turntable 2 shares the same plane with the upper surface of the base 1. A workpiece M, such as a wooden board, is placed on the upper surfaces of the base 1 and the turntable 2. The fence 3 is fixed on the upper surface of the base 1 to support the side surface of the workpiece M. The holder 10 is supported in an upright posture on the rear end of the turntable 2 by the holder shaft 4. The axial center of the holder shaft 4 is aligned substantially with the upper surface of the turntable 2. The holder 10 can be pivoted leftward or rightward with respect to the surface of the turntable 2 about the holder shaft 4.

As shown in FIG. 9, an elongated hole 10a is formed in the rear portion of the holder 10 with a curved shape centered on the holder shaft 4. The clamp lever 5 passes through the elongated hole 10a. A screw portion 6 formed on the tip of the clamp lever 5 is screwed into a screw hole formed in the rear surface of the turntable 2. When the screw portion 6 of the clamp lever 5 is loosened, the holder 10 can be pivoted around the holder shaft 4 within the range defined by the elongated hole 10a. When the screw portion 6 is retightened, the holder 10 is squeezed between the turntable 2 and the clamp lever 5 and fixed in a desired position. It should be noted that the elongated hole 10a is formed with an arc range enabling the holder 10 to be pivoted left and right within a 45-degree angle.

The cutter mechanism 20 is supported above the holder 10 on a shaft 11 to be freely swingable up and down with respect to the upper surface of base 1. A spring 12 is provided between the holder 10 and the cutter mechanism 20 to urge the cutter mechanism 20 upward.

As shown in FIGS. 8 and 10 the cutter mechanism 20 includes a cutting blade shaft 21, a cutting blade, such as a circular saw blade 22, a saw cover 23, a gear case 24, and a handle 29. The cutter mechanism also includes a motor 25, a motor shaft 26, a motor housing 28, bearings 30, 31, a pulley 33, and a transmission belt 27.

The saw cover 23 covers the upper half of the cutting blade 22 and is formed integrally with the gear case 24. The motor housing 28 is positioned above the gear case 24 and covers and supports the motor 25 and the motor shaft 26. The cutting blade shaft 21 is positioned below the gear case 24. As shown in FIG. 10, the cutting blade 22 is fixed on one end of the cutting blade shaft 21 by a bolt 32 and is rotatably supported on the bearings 30, 31. The motor shaft 26 is rotatably supported on a bearing 34. The pulley 35 is provided on the exposed tip of the motor shaft 26 at a position above a pulley 33. The transmission belt 27 spans between the pulleys 33, 35. Power from the motor 25 is transmitted to the cutting blade 22 through the motor shaft 26, the pulleys 35, 33, the transmission belt 27, and the cutting blade shaft 21 to drivingly rotate the cutting blade 22.

As shown in FIGS. 8 and 11, a V-shaped protrusion portion 13 is mounted on the front surface of the holder 10. Stopper bolts 7A, 7B are screwingly fitted in a vertically aligned orientation in the rear upper surface of the turntable 2 at positions along the movement orbit of the protrusion portion 13. Therefore, when the holder 10 is tilted leftward or rightward, then the protrusion portion 13 will abut the head portion of the corresponding stopper bolt 7A, 7B once the holder 10 is tilted to a predetermined angle. In other words, the bolts 7A, 7B determine the tilting range possible of the cutter mechanism 20. According to the present embodiment, the stopper bolts 7A, 7B are disposed to abut the protrusion portion 13 when the holder 10 is pivoted to the extreme left or right (as viewed in FIG. 11) of a 45 degree range.

Although not shown in the drawings, a blade groove plate is fixed to the upper surface of the turntable 2. The blade groove plate is formed with a groove at its center into which the cutting blade 22 enters during cutting operations for cutting a workpiece M. During operations for cutting the workpiece M, the lower edge of the cutting blade 22 drops below the upper surface of the turntable 2. At this time, the cutting blade 22 enters into the groove of the groove plate so that the cut surface of the workpiece M can be prevented from being roughened or scuffed by the edge of the blade 22.

As shown in FIG. 8, the laser unit U includes a support member 40 and a rectangular-shaped laser generator 41. The support member 40 is fixed to the front surface of the holder 10 and houses the laser generator 41. As shown in FIG. 12, the support member 40 and the laser generator 41 define therebetween a rectangular housing space 40a. The laser generator 41 includes a light emitting portion 41a (FIG. 13) for emitting a laser light L1. According to the present embodiment, the light emitting portion 41a is positioned along an imaginary line extending from the blade edge 22a of the cutting blade 22. The laser generator 41 includes a switch (not shown) for starting drive of the light emitting portion 41a to emit the laser light L1.

The support member 40 supports the laser generator 41 in an orientation to direct at least a portion of the emitted laser light L1 directly beneath the blade edge 22a of the cutting blade 22, assuming that the cutter mechanism 20 is raised in its uppermost position as shown in FIG. 8. This configuration overcomes the shortcomings of the configuration described in U.S. Pat. No. 5,375,495, so that the laser light L1 irradiates the upper surface of the workpiece M without interference from the cutting blade 22. As a result, the operator can align the laser light L1 with the interior of left and right edges of the cutting width W2 in the manner shown in FIGS. 6 (a) and 6 (b).

A detailed explanation of the laser unit U according to the present embodiment will be described while referring to FIGS. 12 to 14. The laser unit U is configured to enable horizontal movement of the laser generator 41, so that the position where the laser light L1 falls incident on the workpiece M can be minutely adjusted. For example, when the width W2 of the cutting blade 22 is different from the width W1 of the laser light L1, the laser light L1 can be directed onto the workpiece as indicated in FIGS. 4 through 7 (b), that is, aligned with the interior or exterior of left or right edges of the cutting width W2. Because the laser generator 41 can be moved horizontally, the laser light L1 can be aligned with any position of the cutting width W2.

As shown in FIG. 12, a screw-hole portion 40b is formed at the left side surface of the support member 40. A screw portion 42A of a knob 42 is screwingly fitted in the screw-hole portion 40b. The tip of the knob 42 abuts against the left side surface of the laser generator 41. A compression spring 43 is disposed between the right side wall of the support member 40 and the right side surface of the laser generator 41. The compression spring 43 urges the laser generator 41 toward the knob 42, thereby removing any looseness in the fit between the knob 42 and the laser generator 41. As shown in FIGS. 12 and 14, a bolt 45 passes through the rear wall of the support member 40 and is screwingly fixed into a female screw opened in the laser generator 41. A compression spring 46 is disposed between the bolt 45 and the support member 40 to pull the laser generator 41 rearward. Two stoppers 47 are provided, one screwingly penetrating through each of the left and right side walls of the support member 40. When the laser generator 41 is moved a certain distance either leftward or rightward, the tip of the corresponding stopper 47 abuts the wall of the laser generator 41. In this way, the stoppers 47 restrict horizontal movement of the laser generator 41 within in a predetermined range.

As shown in FIG. 13, left and right compression springs 44 are supported between the upper surface of the laser generator 41 and the upper wall of the support member 40, to urge the laser generator 41 downward. A protruding abutment surface 40c is provided in the rear internal side of the support member 40, that is, in the rectangular housing space 40a, in abutting confrontation with the rear surface of the laser generator 41.

With this configuration, when the knob 42 is rotated to screwingly move leftward as viewed in FIG. 12, the laser generator 41 is slid horizontally leftward by restorative force of the compression spring 43. On the other hand, when the knob 42 is rotated to screwingly move rightward, the laser generator 41 will be pressed by the knob 42 and slid horizontally rightward against the urging force of the compression spring 43. When the knob 42 is rotated once, the laser generator 41 will move by an amount equivalent to only the amount that the screw portion of the knob 42 moves horizontally, thereby enabling minute adjustment of the laser generator 41. At this time, the laser generator 41 is urged against the left, lower, and rear surfaces of the light emitting portion 41a by the compression springs 43, 44, 46 and the bolt 45, thereby removing any looseness between the support member 40 and the laser generator 41. This prevents the knob 42 from being unintentionally rotated by vibration and the like during operations, so the laser generator 41 will not be unintentionally moved.

Next, cutting operations using the cutter D1 according to the present embodiment will be explained. First, the user draws a line L2 on the upper surface of the workpiece M as shown in FIG. 4. For this explanation it will be assumed that the user wants to use the left-hand portion Ma of the workpiece M after cutting the workpiece M, and wishes to retain the line L2 on the portion Ma. In this case, when the laser light L1 is to be aligned with the interior of the left edge of the cutting width W2 as shown in FIG. 6 (a) then the left edge of the laser light L1 is aligned with the right edge of the line L2. On the other hand, when the laser light L1 is to be aligned exterior of the left edge of the cutting width W2 as shown in FIG. 7(a), then as shown in FIG. 5, the operator aligns the right edge of the laser light L1 with the right edge of the line L2. Then, the user grasps the handle 29 of the cutter mechanism 20 and swings the cutter mechanism 20 downward so that the rotating blade cuts through the workpiece M.

Next, a cleaning mechanism for cleaning the laser generator 41 will be explained while referring to FIGS. 15 to 18. As a modification to the first embodiment, the cleaning mechanism is provided in order to clean the surface of the light emitting portion 41a of the laser generator 41. That is, during the process of cutting through the workpiece M, saw dust 63 flies toward the light emitting portion 41a of the laser generator 41 in the direction indicated by an arrow in FIG. 15. In some cases, the sawdust 63 will cling to the light emitting portion 41a as shown in FIG. 16. To remove any sawdust 63 that clings to the light emitting portion 41a, a brush 36 is attached to the lower rear portion of the cutter mechanism 20. The brush 36 is formed from a plurality of resilient fibers, such as nylon fibers. When the cutter mechanism 20 is lowered, the brush 36 approaches the light emitting portion 41a as shown in FIG. 16 until the brush 36 contacts the light emitting portion 41a as shown in FIG. 17. When the brush 36 presses further against the light emitting portion 41a, the sawdust 63 clinging to the light emitting portion 41a is swept away as shown in FIG. 18. In this way, the saw dust 63 can be removed from the light emitting portion 41a so that the cutting position can be constantly, accurately irradiated by the laser light L1 from the light emitting portion 41a.

Next, the second embodiment of the present invention will be described while referring to FIGS. 19 and 20. The cutter according to the second embodiment has the same configuration as the cutter of the first embodiment, except that the laser unit U of the first embodiment is replaced with a laser unit U2 of the second embodiment. Therefore, only the laser unit U2 according to the second embodiment will be described hereinafter.

As shown in FIG. 19, a hole 140d is formed in the left wall of a support member 140. A knob 142 penetrates through the left wall into the rectangular housing space 40a. A screw portion 142A of the knob 142 is screwingly fitted in a female screw portion 141b opened in the side surface of the laser generator 141. A compression spring 143 is disposed on the shaft of the knob 142 at a position between the left side wall of the laser generator 141 and the left wall of the support member 140. The compression spring 143 urges the laser generator 141 rightward to remove any looseness between the laser generator 141 and the compression spring 143. The laser generator 141 can be slid horizontally either rightward or leftward by rotating the know 142. Other configuration of the laser unit U2 is as same as in the laser unit U, so further description will be omitted. Cutting operations according to the configuration of the second embodiment are also the same as those described for the first embodiment.

Next, the third embodiment will be described while referring to FIG. 21. The cutter according to the third embodiment has the same configuration as the cutter of the first embodiment, except that the laser unit U is replaced with a laser unit U3. Therefore, only the laser unit U3 according to the third embodiment will be explained.

As shown in FIG. 21, a hole 240d is formed in the left wall of a support member 240. A knob 242 penetrates through the left wall into a rectangular space 240a of the support member 240. A ring 248 is rotatably engaged with the knob 242 at a right surface of the left wall of the support member 240, so that the knob 242 is axially immovable relative to the support member 240. Alternatively, the ring 248 can be fixed to the right surface of the left wall of the support member 240, and the knob 242 can be loosely supported by the ring 248, so as to prevent the knob 242 from being released from the support member 240.

A screw portion 242A of the knob 242 is screwingly fitted into the female screw portion 241b in the left side of the laser generator 241. A compression spring 243 is supported between the right side wall of the laser generator 241 and the right side wall of the support member 240. The compression spring 243 urges the laser generator 241 toward the knob 242 so that looseness between the laser generator 241 and the knob 242 is removed. Because the ring 248 restricts movement of the knob 242, the laser generator 241 itself slides leftward or rightward in the horizontal direction when the knob 242 is rotated. Other configuration of the laser unit U3 is same as for the laser unit U described in the first embodiment, so further explanation will be omitted. Also, the cutting operations using the cutter of the third embodiment are performed in the same manner as described for the first embodiment.

Next, the fourth embodiment will be described while referring to FIG. 22. The cutter according to the fourth embodiment is the same as described for the first embodiment, except that the laser unit U is replaced with a laser unit U4. Therefore, only the laser unit U4 according to the fourth embodiment will be described hereinafter.

As shown in FIG. 22, a hole 340d is formed in the left wall of a support member 340. A knob 342 passes through the hole 340d into a rectangular space 340a in the support member 340. The knob 342 rotates idly in the hole 340d. A pinion 349 is connected to the inward-facing tip of the knob 342, with the pinion 349 positioned in the rectangular space 340a in abutment with the inner surface of the left wall of the support member 340. The pinion 349 rotates idly with idle rotation of the knob 342 in the hole 340d.

A gear 350 is meshingly engaged with the pinion 349. A horizontally extending screw shaft 350a is connected to the center of the gear 350. The screw shaft 350a is screwingly engaged in a female screw portion 341b in the left side surface of the laser generator 341. A compression spring 343 is supported between the right wall of the support member 340 and the laser generator 341. The compression spring 343 urges the laser generator 341 toward the gear 350, thereby eliminating any looseness between the gear 350 and the laser generator 341. When the knob 342 is rotated, the pinion 349 rotates the gear 350. As a result, the laser generator 341 slides leftward or rightward horizontally, depending on the direction of rotation of the knob 342. Other configuration of the laser unit U4 is the same as for the laser unit U of the first embodiment, so further explanation will be omitted. Also, the cutter according to the fourth embodiment cuts the workpiece M in the same manner as described for the first embodiment.

Next, the fifth embodiment of the present invention will be described while referring to FIG. 23. The cutter according to the fifth embodiment has the same configuration as the cutter of the first embodiment, except that the laser unit U is replaced with a laser unit U5. Accordingly, only the laser unit U5 according to the fifth embodiment will be described hereinafter.

A hole 440d is formed through the left wall of the support member 440, and a knob 442 penetrates through the hole 440d into the rectangular space 440a. A wall 440A is formed inside the support member 440. A pinion 449 is connected to the shaft tip of the knob 442, with the left wall of the support member 440 sandwiched between the pinion 449 and the knob 442. That is, the pinion 449 is positioned between the left wall of the support member 440 and the wall 440A, in abutment with the inner surface of the left wall of the support member 440.

A gear 450 is provided in meshing engagement with the pinion 449. The gear 450 is disposed between the left wall of the support member 440 and the wall 440A, in abutment with the inner surface of the left wall of the support member 440. A screw shaft 450A is attached to the center of the gear 450 and penetrates through the wall 440A into screwing engagement with a female screw portion 441b formed in the left side surface of the laser generator 441. A compression spring 443 is supported between the wall 440A and the left side surface of the laser generator 441, for urging the laser generator 441 in a direction away from the knob 442. With this configuration, when the knob 442 is rotated, the pinion 449 rotates the gear 450. The laser generator 441 slidingly moves leftward or rightward in the horizontal direction, depending on rotational amount and direction of the knob 442. Further, horizontal movement of the gear 450 is restricted by the wall 440A. Other configuration of the laser unit U5 is the same as for the laser unit U of the first embodiment, so further explanation will be omitted. Also, cutting operations performed by the cutter of the fifth embodiment is in a same manner as for the cutter of the first embodiment.

Next, a cutter according to the sixth embodiment will be described while referring to FIG. 24. The cutter according to the sixth embodiment has the same configuration as the cutter according to the first embodiment, except that the laser unit U of the first embodiment is replaced with a laser unit U6. Accordingly, only the laser unit U6 of the sixth embodiment will be described hereinafter.

An open portion 540e is formed in the lower center of the support member 540. Right and left hand walls 540A, 540A extend downward from support member 540 on either side of the open portion 540e. A screw bar 551 is fixed between the walls 540A, 540A in a horizontal orientation to extend across the open portion 540e. A ring screw 552 is screwingly fitted on the outer periphery of the screw bar 551. The ring screw 552 can be moved leftward or rightward between the walls 540A, 540A by rotating the screw ring 552 around the screw bar 551. The outer peripheral edge of the ring screw 552 is fitted in a groove 541c formed in the lower surface of the laser generator 541. A compression spring 543 is supported between right sides of the laser generator 541 and the support member 540. The compression spring 543 urges the laser generator 541 against the ring screw 552, thereby eliminating any looseness between the groove 541c of the laser generator 541 and the outer periphery of the ring screw 552. With this configuration, when the ring screw 552 is rotated, the laser generator 541 will slidingly move rightward or leftward in a horizontal direction in linking association with horizontal movement of the ring screw 552. As a modification, the screw bar 551 can be screwingly fitted with respect to the wall portions 540A,540A of the support member 540, rather than fixedly fitted on the wall portions. In this case, the ring screw is fixed on the screw bar 551. With this modification, by rotating the screw bar 551, the ring screw is moved leftward and rightward in linking association with the movement of the screw bar 551, so that the laser generator 541 also slidingly moves leftward and rightward in the horizontal direction depending on rotational amount of the screw bar 551.

Next, the seventh embodiment of the present invention will be described while referring to FIGS. 25 to 29. The cutter according to the seventh embodiment has substantially the same configuration as the cutter of the first embodiment, except that the laser unit U is replaced with a laser unit U7. Accordingly, the following explanation for the seventh embodiment will be provided for the laser unit U7 only. It should be noted that the laser unit U7 is configured to enable adjustment of orientation of the laser generator 641 in both horizontal and vertical directions.

As shown in FIG. 25, a hemispherical indentation 40f is formed in the inner surface of the left sidewall of a support member 640, near the front of the support member 640. Also, a hemispherical indentation 41d is formed in a laser generator 641 at a position corresponding to the hemispherical indentation 40f, that is, in the outer left side surface of the laser generator 641, near the front of the laser generator 641. A ball 53 is supported between the hemispherical indentations 40f, 41d. The laser generator 641 can be freely pivoted within the rectangular space 640a about the ball 53. That is, the ball 53 serves as a pivot fulcrum and the indentations 40f, 41d serve as pivot fulcrum bearings.

A first stopper 54 is screwingly fitted in the rear portion of the left wall of the support member 640. The tip of the first stopper 54 abuts against the left surface of the laser generator 641, at a position near the rear of the laser generator 641. A compression spring 55 is supported between the right surface of the laser generator 641 and the right wall of the support member 640. The compression spring 55 urges the laser generator 641 toward the first stopper 54.

As shown in FIGS. 26 and 27, a second stopper 56 is screwingly fitted in the lower wall of the support member 640. The second stopper 56 is positioned near the right side wall of the support member 640 as shown in FIG. 26, that is, opposite from the ball 53 with respect to the leftward and rightward directions, and also in the substantial center of the support member 640 with respect to the frontward and rearward directions as shown in FIG. 27. The tip of the second stopper 56 abuts against the lower surface of the laser generator 641. As shown in FIG. 27, two compression springs 57 are disposed between the upper surface of the laser generator 641 and the upper wall of the support member 640 on the opposite side of the laser generator 641 from the second stopper 56. The compression springs 57 urges the laser generator 641 toward the second stopper 56. One of the compression springs 57 is disposed to the front of the second stopper 56 and the other is disposed to the rear of the second stopper 56 in order to maintain balance of the laser generator 641.

With this configuration, when the first stopper 54 is rotated and moved rightward, the tip of the first stopper 54 presses against the rear edge portion of the left side surface of the laser generator 641 so that the laser generator 641 pivots about the ball 53 in the clockwise direction as viewed in FIG. 25. As a result, the laser light L1 will tilt to the left as viewed in FIG. 25. When the first stopper 54 is rotated once, the laser generator 641 will move by an amount equivalent to the movement amount of the screw portion of the first stopper 54. As a result, the laser generator 641 can be moved by extremely small amounts. On the other hand, when the first stopper 54 is moved leftward, restorative force of the compression spring 55 will pivot the laser generator 641 about the ball 53 in the counterclockwise directio