Title: Adjusting element and ejector device
Abstract: An adjusting device is mounted for rotation about a central axis and can be axially actuated. The adjusting device can be displaced or shifted between an inoperative position and at least one working position by an axially displaceable fluid-driven piston.
Patent Number: 6,883,745 Issued on 04/26/2005 to Trutschel
| Inventors:
|
Trutschel; Hartwig Horst (Würzburg, DE)
|
| Assignee:
|
Koenig & Bauer Aktiengesellschaft (Wurzburg, DE)
|
| Appl. No.:
|
362970 |
| Filed:
|
September 7, 2001 |
| PCT Filed:
|
September 7, 2001
|
| PCT NO:
|
PCTDE01/03444
|
| 371 Date:
|
March 6, 2003
|
| 102(e) Date:
|
March 6, 2003
|
| PCT PUB.NO.:
|
WO0224564 |
| PCT PUB. Date:
|
March 28, 2002 |
Foreign Application Priority Data
| Sep 19, 2000[DE] | 100 46 165 |
| Current U.S. Class: |
242/533.7; 242/573.7 |
| Intern'l Class: |
B65H 019//30; B65H 075//24 |
| Field of Search: |
242/5337
|
References Cited [Referenced By]
U.S. Patent Documents
| 1446305 | Feb., 1923 | Howe.
| |
| 2681498 | Jun., 1954 | Harney.
| |
| 2949313 | Aug., 1960 | Moser et al.
| |
| 3834276 | Sep., 1974 | Gournelle.
| |
| 4149682 | Apr., 1979 | Gustafson et al.
| |
| 4211375 | Jul., 1980 | Weiss et al.
| |
| 4715553 | Dec., 1987 | Hatakeyama et al.
| |
| 4951894 | Aug., 1990 | Young, Jr. et al.
| |
| 5531398 | Jul., 1996 | Krska.
| |
| 5562035 | Oct., 1996 | Pollich et al.
| |
| Foreign Patent Documents |
| 2 144 672 | Mar., 1972 | DE.
| |
| 28 14 338 | Oct., 1979 | DE.
| |
| 44 34 623 | Apr., 1996 | DE.
| |
| 196 22 474 | Dec., 1997 | DE.
| |
| WO 9828218 | Jul., 1998 | WO.
| |
Primary Examiner: Lillis; Eileen D.
Assistant Examiner: Kim; Sang
Attorney, Agent or Firm: Jones Tullar & Cooper PC
Claims
1. An adjusting element comprising:
at least one adjusting shaft supported for rotation with respect to a center
axis;
means for supporting said at least one adjusting shaft for axial movement with
respect to said center axis;
an axially displaceable fluid driven piston usable to displace said at least
one adjusting shaft between a rest position and a work position, wherein in said
rest position, said piston is out of contact with said at least one adjusting shaft
and in said work position, said at least one adjusting shaft is in contact with
said piston; and
at least one magnetic element, said at least one magnetic element being usable
to return said piston to said rest position.
2. The adjusting element of claim 1 wherein in said working position, said adjusting
shaft and said piston are displaceable to said rest position by at least one elastic element.
3. The adjusting element of claim 2 wherein said at least one elastic element
is a spring.
4. The adjusting element of claim 1 wherein said at least one magnetic element
is fixed on said piston.
5. An adjusting element comprising:
at least one adjusting shaft support ed for rotation with respect to a center
axis;
means for supporting said at least one adjusting shaft for axial movement with
respect to said center axis;
an axially displaceable fluid driven piston usable to displace said at least
one adjusting shaft between a rest position and first and second working positions,
wherein in said rest position, said piston is out of contact with said at least
one adjusting shaft, wherein said fluid driven piston is engageable with said at
least one adjusting shaft in said first working position by being charged with
a fluid under pressure, and wherein in said second working position, said at least
one adjusting shaft is engageable with said piston not charged with a fluid under
pressure.
6. The adjusting element of claim 5 wherein in said working position, said adjusting
shaft and said piston are displaceable to said rest position by at least one elastic element.
7. The adjusting element of claim 6 wherein said at least one elastic element
is a spring.
8. The adjusting element of claim 6 wherein said magnetic element is a permanent magnet.
9. An adjusting element comprising:
at least one adjusting shaft supported for rotation with respect to a center
axis;
an ejecting device usable to strip a tube off a clamping mandrel portion of said
adjusting element;
an axially displaceable fluid driven piston usable to displace said at least
one adjusting shaft between a rest position and at least one working position,
wherein in said rest position, said piston is out of contact with said adjusting
shaft, and in said at least one working position, said piston is in contact with
said adjusting shaft.
10. The adjusting element of claim 9 wherein in said working position, said adjusting
shaft and said piston are displaceable to said rest position by at least one elastic element.
11. The adjusting element of claim 10 wherein said at least one elastic element
is a spring.
Description
FIELD OF THE INVENTION
The present invention is directed to an adjusting element and an ejecting device
for a mandrel. The adjusting element is rotatably supported around a center axis
and can be axially actuated.
BACKGROUND OF THE INVENTION
Clamping mandrels usable for the rotatable support of paper rolls, such
as are used in connection with web-fed rotary printing presses, are known from
U.S. Pat. No. 4,149,682, U.S. Pat. No. 4,951,894 and U.S. Pat. No. 4,715,553. Ejecting
devices are provided on the clamping mandrels, by use of which the tube on which
the paper web is wound can be stripped off the clamping mandrels. Spring elements,
that are provided on the ejecting device, are elastically prestressed in the course
of inserting the clamping mandrel into the tube. When the clamping mandrel is pulled
back out of the tube for changing the paper web, the prestress of the spring elements
assures that the tube is stripped off the two oppositely located clamping mandrels.
The disadvantage of this type of structure of an ejecting device lies in that
the force, by which the tube can be stripped off the clamping mandrel, is limited
by the type of construction of the spring elements. It is moreover necessary to
overcome the prestress of the spring elements in the course of inserting the clamping
mandrels into the tube.
A clamping mandrel is known from DE 28 14 338 A1, in which a displaceable ring,
which can rotate together with the mandrel, is arranged between the detent flange
of the mandrel and the tube. An actuating device, which is fixed in place on a
frame, is provided for ejecting the tube. Claws are provided on the actuating device,
wherein the ring can freely rotate in one position of the claws, namely the position
of rest, and is not in engagement with the claws. In the course of operating the
actuating device the claws are pressed against the ring, so that the tube can be
stripped off the clamping mandrel.
It is disadvantageous in connection with the actuating device known from DE 28
14 338 A1 that, because of its mechanical drive mechanism, the ejecting device
requires a large structural volume.
U.S. Pat. No. 2,949,313 discloses an adjusting element which is rotatably seated
around its center axis and which can be axially actuated. The adjusting element
can be displaced between a position of rest and at least one working position by
use of an axially displaceable, fluid-driven piston.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide an adjusting element.
In accordance with the present invention, the object is attained by providing
an adjusting device which is rotatable about a central axis. The adjusting device
is axially displaceable by use of an axially displaceable fluid driven piston.
The adjusting device is displaceable between a position of rest and at least one
working position. In the rest position of the adjusting device the piston does
not contact the adjusting device in the working position of the adjusting element,
it is in contact with the piston. Movement of the piston to its rest position can
be accomplished by use of a magnetic element. An ejector device, for stripping
a tube off a mandrel of the adjusting device can be provided.
The advantages which can be achieved by the present invention lie, in particular,
in that a pressure-charged piston is employed for driving the ejecting arrangement.
Since the pressure-containing fluid, which may be, for example, compressed air
or hydraulic fluid, can be conducted to the piston head above the piston through
conduits, whose geometry can be arbitrarily designed, clamping mandrels of very
compact design are possible. It is furthermore possible to generate very high stripping
forces by selecting a correspondingly high working pressure.
To reduce the technical outlay, in the course of constructing the clamping mandrel,
it is advantageous if the piston for stripping off the tube is driven by use of
the fluid. Elastic spring elements, for example helical springs, can be used for
restoring the piston into the initial position.
Since the ejecting arrangement has an element, which can be rotated along with
the clamping mandrel, and a fixed element, which two elements must be brought into
engagement with each other, there is the danger that increased wear may occur in
the area of contact between the rotatably seated element and the stationary element
of the ejecting arrangement. Therefore, the embodiment of the ejecting arrangement
is to be selected so that the second element can be switched between a position
of rest and at least one working position. In the position of rest, the first element
is completely separated from the second element by a gap, while in the working
position the first element comes to rest against the second element, so that forces
for actuating the second element can be transmitted.
Magnetic elements can be particularly advantageously employed for restoring
the second element out of at least one working position. The attracting forces,
emanating from a magnetic element, act in a contactless manner over an air gap,
and in this way they can automatically retract the stationary second element, for
example an actuating piston, in a particularly simple manner.
In general it is advantageous, in connection with devices which have a rotatably
supported and axially actuable adjusting element, which adjusting element can be
displaced by an axially displaceable, fluid-driven piston between a position of
rest and at least one working position, if the axially displaceable, fluid driven
piston can be returned from its working position into its position of rest by use
of at least one magnetic element. It is possible, in this way, to prevent wear
in the contact zone between the fixed piston and the rotatably supported seated
adjusting element in a simple way. As long as it is not needed, the piston is automatically
retracted, in a simple manner, by the magnetic element and is dependably maintained
in its retracted position.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the present invention is represented in the drawings
and will be described in greater detail in what follows.
Shown are in:
FIG. 1, a cross-sectional, side elevation view of a clamping mandrel in accordance
with the present invention,
FIG. 2, a detail view taken at X in FIG. 1 and showing the clamping mandrel
in a first operating state, and in
FIG. 3, a detail view taken at X in FIG. 1 and showing the clamping mandrel
in a second operating state.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A clamping mandrel
01 in accordance with the present invention is represented
in FIG.
1. Clamping mandrel
01 is fastened in a frame
02,
shown in a broken-off manner, of a roll changer, which is not further represented.
A multi-part shaft
07 is rotatably supported in rolling bearings
04,
06 in the housing
03 of the clamping mandrel
01, which housing
03 is fixedly connected with the frame
02.
On the left side of the housing
03, as seen in FIG. 1, the multi-part
shaft
07 extends to the outside of the housing
03 and constitutes a clamping
cylinder
08, on which a schematically represented tube
09 can be
fixed in place. To fix the tube
09 in place on the clamping mandrel
01,
toggle levers, located at clamping cheeks
11 of the clamping cylinder
08,are
pushed radially outward by the use of plate springs and compression springs. An
adjusting element
12 of the multipart shaft
07, for example an actuating
shaft
12, can be axially displaced in a hollow shaft
13 of the multipart
shaft
07for actuating the clamping cheeks
11, so that the clamping
cheeks
11 are pushed radially outward by positive engagement with spreading
elements
14 which are carried at the left or outboard end of the actuating
shaft
12.
The tube
09, which is engaged by the clamping cylinder
08 supports
a rolled-up web, such as, for example a paper web.
For stripping an empty or used tube
09 off the clamping cylinder
08,
a stripping ring
10 of the clamping cylinder
08, including an ejecting
arrangement with several actuating elements
16, for example rotatable elements
16, for example ejecting bolts
16, is provided. In this case, the
ejecting bolts
16 are arranged in such a way on a hollow shaft
13,
which is part of the multipart shaft
07, so that the one end of the stripping
ring
10 can come to rest against the front or end face of the tube
09.
To accomplish the removal of the tube
09 from the clamping cylinder
08,
the ejecting bolts
16 are synchronously moved axially out, together with
the stripping ring
10, from the free end of the multipart shaft
07.
In the course of this movement, they push the tube
09 axially off the clamping
cylinder
08. Care should be taken that the ejecting bolts
16 and
the stripping ring
10 are seated to be axially displaceable on the hollow
shaft
13 and, together with the hollow shaft
13, rotate in the housing
03 around the center axis
17.
A non-rotatable element, for example a ring-shaped piston
18, which can
be charged with a pressure medium via a pressure line
19, is used for actuating
the ejecting bolts
16. The functioning of the actuation of the ejecting
bolts
16 by use of the piston
18 will be explained by utilization
of FIGS. 2 and 3, which represent the detail X in FIG. 1 in an enlarged manner.
The piston
18 and the right end of the ejecting bolt
16 can be
seen in cross section in FIG.
2. In connection with the operation of the
ejecting bolt
16, it should be noted that the piston
18, together
with the housing
03, an intermediate element
21 and the outer ring
of the rolling bearing
06, are fixed in place in relation to the frame
02,
while the ejecting bolt
16, together with the hollow shaft
13, can
rotate around the center axis
17 of the clamping mandrel
01. The
ring-shaped piston
18 can be sealed by simple seals or seal rings
24,
26, which are structured in the manner of piston rings.
The piston
18 is shown in its position of rest in FIG. 2, in which rest
position of piston
18 the ejecting bolt
16 and the piston
18
are separated by a gap
22. In the position of rest of the piston
18,
the ejecting bolts
16 can rotate, free of wear and resistance, around the
center axis
17. Magnetic elements
23, for example permanent magnets
23, are fastened to the front or end face of the piston
18 which
is facing away from, or remote from the ejecting bolts
16. These magnetic
elements
23 pull the piston
18 against the metallic intermediate
element
21 and in this way assure that the piston
18 is dependably
maintained in its position of rest. The piston
18 is sealed against the
housing
03, or the intermediate element
21, by operation of the seal
rings
24,
26. It is thus possible to exert a force directed in the
direction of the ejecting bolt
16 by charging the pressure line
19
with a pressure medium so as to move the ring-shaped piston
18 to the left,
as shown in FIG.
3.
In FIG. 3 the piston
18 is represented in its working position. By supplying
pressure medium through the pressure line
19, the piston
18 is pushed
against the ejecting bolt
16, so that the ejecting bolts
16 and the
stripper ring
10 move out to the left, as shown in dashed lines in FIG.
1 to strip the tube
09 off the clamping cylinder
08. As soon as the
tube
09 has been stripped off, the pressure medium is drained from the pressure
line
19, so that no pressure forces will now act on the piston
18.
Springs
27, for example helical springs
27, are provided on
each of the ejecting bolts
16, which helical springs
27 prestress
the ejecting bolts
16 against the hollow shaft
13, A restoring force
which, following the draining of the pressure medium out of the pressure line
19,
assures that the ejecting bolts
16 are again automatically retracted, acts
on the ejecting bolts
16 because of the prestress by the helical springs
27. The piston
18 is also pushed back together with the ejecting
bolts
16 until the ejecting bolts
16 come into contact with appropriately
provided end stops
28, as shown in FIG.
1. In this rearmost working
position, in which the piston
18 still rests against the ejecting bolt
16,
a gap
29 exists between the piston
18 and the intermediate element
21, which gap
29 must be bridged to return the piston
18 out
of its rearmost working position and into a position of rest. By operation of the
permanent magnets
23 provided on the piston
18, a magnetic force,
which is directed toward the right as seen in FIGS. 2 and 3, acts on the piston
18, which magnetic force causes the return of the piston
18 across
the gap
29. At the termination of the actuation of the ejecting bolts
16,
the piston
18 again takes up its position of rest as represented in FIG.
2, where it is separated from the ejecting bolts
16 by the gap
22.
For actuating the rotatably seated, axially shiftable ejecting bolts
16,
it is merely necessary to employ the displaceably seated piston
18. Accordingly,
the sealing of the work chamber above the piston
18 is greatly simplified.
The walls of the piston
18 constituting the sealing gap, on the one hand,
and of the housing
03, or of the intermediate elements
21, on the
other hand, do not perform any rotationally directed relative movement.
The end positions of the piston
18 are detected and determined by sensors.
The employment of magnetic elements for uncoupling of a pair of elements can
be utilized, for example, also in the actuating device of the clamping cheeks
11.
It can be seen in FIG. 1 that the actuator shaft
12, which represents such
a rotatably seated actuating element, can be displaced toward the left by operation
of an axially displaceable, non rotating piston
31 for actuating the clamping
cheeks
11. For this purpose, a pressure medium is supplied via a pressure
line
32 to a cylinder chamber formed by the piston
31 and the housing
03. The pressure medium assures that the piston
31 is displaced toward
the left and in this way displaces the actuator shaft
12 by acting on the
front plate
33, so that as a result the clamping cheeks
11 can be actuated.
Following the draining of pressure medium from the pressure line
32,
coil springs
34 assure the return of the actuator shaft
12, so that
the piston
31 is pushed back by the front plate
33. The return of
the actuator shaft
12 is limited by end stops, so that the front plate
33
can push the piston
31 back only up to a defined point, namely the rearmost
working position. In this position, the piston
31 still rests against the
front plate
33, which is undesirable because of wear occurring in case of
a relative movement between the front plate
33 and the piston
31.
To prevent this wear, magnetic elements
37, for example a permanent magnet
37, are provided on the front face of the piston
31 facing away from
the front plate
33, by use of whose magnetic forces the piston
31
can be returned into a position of rest, in which the piston
31 no longer
rests against the front plate
33.
While a preferred embodiment of an adjusting element and ejector device in
accordance with the present invention has been set forth fully and completely hereinabove,
it will be apparent to one of skill in the art that changes in, for example, the
overall size of the device, the specific type of working fluid and the like could
be made without departing from the true spirit and scope of the invention which
is to be limited only by the following claims.
*
