JPH10244327A - Punch unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust the length of a punch by arranging a radial direction projecting part arranged to one of a bushing and a base and an axial/ longitudinal direction groove formed on the other of the bushing and the base. SOLUTION: A punch unit can quickly and simply change a whole length of a punch 10 and a punch driver 22. That is, for a guide bushing 12, the unit consisting of the punch 10 and the punch driver 22 is separated and lifted so that a radial direction projecting part 40 moves downward from a groove which receives the projecting part and is open at its end. The punch unit 22, at the position lifted or retracted, is rotated to one direction or the other direction, when the punch 10 together with guide bushing 12 is fixed by engaging a pin 14 with the groove 16, an engaging length, in which a tip 24 of the punch driver 22 formed with an external screw in inserted in a screw hole of a rear end of the punch 10, is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punch unit, and more particularly, to a punch unit with improved structural engagement between the main components of the punch,
The structure facilitates the adjustment of the punch length. The present invention also relates to a punch unit housing, with improved structural engagement and movement common to punch stroke and spring force.

[0002]

2. Description of the Related Art Generally, a punch unit has a punch driver connected to a punch. The punch driver has a punch head at its rear end,
A structure is provided for preventing relative rotation between the punch and the punch driver during the punching process. An axially removable pre-loaded return spring is positioned between the punch head and the guide bush receiving the punch to return the punch driver and punch to a rest position after the punching stroke. I have.

[0003] A punch unit of this general type is
U.S. Pat. Nos. 4,092,888; 4,375,774; 51
No. 31303; 5329835; and International Patent WO
No. 96/03261; shown in earlier patents included in WO 96/05030.

[0004]

However, these prior punch units, although satisfactory in various respects, have been improved with an assembling structure for easily and effectively adjusting the length of the punch. There is still a need to provide an improved punch unit.

There is also a need for improved structural engagement and movement of the housing caused by punch stroke and spring pressure.

Accordingly, it is an object of the present invention to provide an improved punch unit in which the length of the punch is easily adjusted.

[0007]

According to a preferred embodiment of the present invention, a punch unit has a front end and a rear end, and a base disposed on the rear end. The bush receives the punch and the punch driver and guides the axial movement of the punch. The bush has a front stop surface and a rear stop surface, the rear stop surface being closer to the base than the front stop surface. The spring is kept preloaded between the front stop surface and the rear stop surface. A connecting means connects the bush and the base behind the rear stop surface. The connecting means connects and disconnects the bush and the base behind the rear stop surface, and adjusts the axial direction of the punch with respect to the punch driver, that is, connects the punch driver to the punch and removes the punch driver from the punch, respectively. In addition, one of the bush and the base has a radial projection, and the other of the bush and the base has an axial longitudinal groove.

[0008] In another preferred embodiment according to the present invention,
The punch unit is a punch driver having a front end and a rear end, wherein the rear end is connected to the punch driver having a base thereon and the front end of the punch driver by means of an axial fixing screw. With a punch. The guide bush slidably receives the punch and guides the axial movement of the punch. The guide bush has means for preventing rotation of the punch relative to the guide bush during the punching stroke of the punch. A sliding bush having a front end and a rear end receives the punch driver. A front end of the sliding bush is guided movably in the axial direction within the guide bush. The spring, which is maintained in a preloaded state between the base and the guide bush, can apply pressure between the base and the guide bush during a punching process of the punch. A spring seat is disposed between the rear end of the slide bush and the base and fixed to the slide bush, and the spring is supported by the spring seat. At least one releasable securing means is movable on at least one of the punch driver and the spring seat so as to engage the other of the punch driver and the spring seat;
A locking position in which the releasable fixing means engages with one of the punch driver and the spring seat to prevent relative rotation of the punch driver and the sliding bush during a punching stroke of the punch;
The punch driver and the sliding bush are movable between an unlocked position for allowing relative rotation of at least one of the bush and the sliding bush.

In still another embodiment according to the present invention, a punch unit has a housing and a punch driver received in the housing in an axial direction. The guide bush is connected to the housing for rotation with respect to the housing. A punch is provided in the guide bush against rotational movement with respect to the guide bush, and the punch can be attached to a punch driver. The spring means applies an axial pressure to the punch driver so as to move away from the guide bush. The punch unit further has indicator means for the rotational position of the guide bush with respect to the housing. The indicator means comprises: (1) during normal operation of the punch unit, in the engagement position of the spring-loaded means, the housing and the guide bush remain rotationally fixed with respect to each other; and (2) For the purpose of adjustment, release the spring-loaded means so as to allow rotation of the guide bush and housing relative to each other to adjust the length of the punch. It has spring-loaded means on one of the guide bushings or housing and engaging the grooves in the other.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, like components are denoted by the same reference numerals throughout the drawings.

In a first embodiment of the invention shown in FIGS. 1 to 3, the punch unit comprises a punch 10 which is guided in a known manner in a guide bush 12 so as to be able to move linearly. The rotation of the punch 10 with respect to the guide bush 12
Firmly fixed in the radial hole in the punch 10,
Radially protruding and blocked by a pin 14 engaging a longitudinal groove 16 inside the guide bushing 12. This longitudinal groove 16 also opens radially outwardly over its length, so that a pin or other fixing member (not shown) can engage the groove 16 from the outside, and The guide bush 12 can be held so as not to rotate on the frame of the device that does not. In this regard, the disclosed punch unit is the same as the conventional punch unit including the arrangement of the stripper ring 20 fixed to the lower end of the guide bush 12 by the safety washer 18.

A punch driver 22 is screwed to the rear end or upper end 84 of the punch 10, similarly to a known punching tool. In the exemplary embodiment shown, the upper end 84 of the punch 10 is provided with a screw hole for this purpose, in which the shaft tip 24 of the punch driver 22 with external threads is screwed. Has been entered. The total length of the punch 10 and the punch driver 22 is set by adjusting the depth at which the tip 24 of the punch driver 22 is screwed into the screw hole of the punch 10. Reference numeral 26 denotes a base fixed to the rear end of the punch driver 22.
Is identified by

An unusual configuration of the disclosed punch unit is that the front 72 of the unit extends to the rear 74 by the mating bushing 28. The mating bushing 28 may have a tapered shoulder 86 or an axially stepped surface that fits snugly in the enlarged rear portion 80 of the guide bushing 12 with the sliding connection means 76. It has it in the front part 78. An O-ring 30 is mounted within the guide bush 12 and may be disposed on the outer peripheral surface of the tapered shoulder 86 of the bushing 28. Tapered shoulder 8
At 6, the inside diameter of the bushing 28 is larger than the outside diameter of the punch 10, so that during the punching stroke the punch is free to move in its axial direction and can be inserted from above or from behind. 28 and can be inserted into the guide bush 12. Alternatively, the punch 10 can be guided via the tapered front of the bushing 28.

In order to secure the bushing 28 against relative rotation with respect to the guide bush 12, the guide bush 12 is provided with fixing means in the form of one or more shaft holes 32 in the rear part 80. I have. The bore is engaged by a pin 34 mounted in a tapered shoulder 86 of the bushing 28. Thus, in the assembled state, the two bushings 12, 28 are frictionally engaged via O-rings to prevent a relative rotation to form a sealed unit. In other words,
The punch unit is assembled from the guide bush 12 and the mating bush 28, which can also be manufactured as one piece.

In the embodiment of FIGS. 1 and 2, the bushing 28 has an internally threaded rear end 88 in which a rear spring receiver 36, preferably in the form of a ring, is provided with a ring spring. It is screwed in as a shape insert.
The rear spring receiver 36 has a rear stop surface 66 for a compression spring 38 housed in the bayonet bushing 28, which spring is formed by a front stop surface or front spring receiver 64, i. Supported by the shoulder. Compression spring 3
The desired preload for 8 can be set by adjusting the depth of insertion of the rear spring receiver 36 into the internal threads of the bushing 28. The selected setting is determined, for example, by means of a radial projection 40 which is screwed from the inside into the radial threaded hole of the rear spring receiver 36 until it engages the internal thread of the bushing 28. Fixed in position. The radial protrusion 40 may be an adjusting screw whose rear end projects radially inward from the rear spring receiver 36. Further, one or more radial projections on the radial inner peripheral surface of the rear spring receiver 36, for example, an integrated structure or a press-fit pin may be used. In the assembled state shown in FIG. 1, the means for preventing the rotation of the punch 10 with respect to the bushings 28, 12 comprises a radial projection 40 or equivalent and four axial longitudinal grooves 42. Has another radial protrusion that engages with one of the base 26, and the axial longitudinal grooves are evenly distributed around the outer peripheral surface of the base 26, so that in this case, the punch driver 22 The relative rotation of the bushings 28 and 12 and thus of the punch 10 is also prevented. Because the longitudinal grooves 42 in the base 26 are continuous, i.e. open at their axial ends, the punch 10 and the punch driver 22 can be easily assembled axially from the rear end. 1 can be carried out in the assembled state shown in FIG. 1 and can be removed again behind or upwards. In the process of their incorporation, it is sufficient for the radial projections 40 to be co-linear with one of the longitudinal grooves 42.

In order to improve the abutment of the upper end of the compression spring 38, an intermediate ring 44 is inserted between said spring and the rear spring receiver 36, whereby
The spring 38 is supported by the rear spring receiver 36. The inner diameter of the intermediate ring 44 is selected such that the shaft of the punch 10 and the punch driver 22 can be guided therethrough. However, the base 26
It has a larger outer diameter and, as a result, rests on the rear or upper surface of the intermediate ring 44 in the assembled state shown in FIG. Therefore, in the punching process, the intermediate ring 44
It follows the axial movement of the base 26 against being pushed on its lower side by the compression spring 38.

The illustrated punch unit includes a punch 10.
And there is the particular advantage that the overall length of the punch driver 22 can be changed quickly and easily. Starting from the position shown in FIG.
The unit consisting of the 0 and the punch driver 22 need only be lifted apart so that the radial projection 40 can receive the projection and move downward from the groove opening at the end. This retracted position of the punch unit 22 is shown in FIG. If the punch driver 22 is rotated in one direction or the other in this position or in a further raised or retracted position, the punch 10 together with the guide bush 12
When the punch 24 is fixed against rotation by engagement with the punch 10, the engagement length of the distal end 24 of the punch driver 22 having the external thread inserted into the screw hole at the rear end of the punch 10 changes. Since the pitch of this screw is known, two grooves 4
The amount of change in the pitch angle between the two indicates the amount of change in the overall length of the punch 10 and the punch driver 22 when the punch driver 22 is rotated. It can be seen that as the number of grooves 42 formed over the circumference increases, the accuracy of the adjustment increases. During this time, for example, a tooth-shaped groove 42
And a rear spring receiver 36 shaped to fit the internal teeth
May be implemented.

In order to set the entire length of the punch 10 and the punch driver 22 more quickly, the fitting bush 28 is used.
A visible mark can be provided at a position where the groove 42 on the outer periphery of the.

After setting the desired overall length, the punch driver 22 is lowered, as shown in FIG. 1, so that the radial projection 40 is again brought into contact with one of the grooves 42. It suffices to return to the operating position where it is in the engaged state.

Unlike the previous embodiment, the shaft of the punch driver 22 can be formed integrally with the punch 10. In this case, the base 26 is screwed into the rear of this unit, and the overall length of the punch 10 and the punch driver 22 is fixed such that the base 26 is screwed deeper or shallower, for example into a radial screw hole. It is adjusted by being able to be fixed at the desired position by means such as screws. Similarly, the locking screw can protrude radially outward from the base 26, similar to the radial protrusion 40, and the arrangement shown is not suitable, but around the rear spring receiver 36. Along with one or more longitudinal grooves.

Based on the above description and drawings, the securing or safety means for protecting the rotational position of the punch driver 22 or at least its base 26 with respect to the punch 10 is of a simple nature with respect to construction and manufacturing technology. That is stated. Changing the overall length of the punch 10 and the punch driver 22 can be achieved more quickly and more easily than in the past. As can be seen in comparison with FIGS. 1 and 2, it can easily be seen that as the length changes, the punch driver is again correctly placed in the insert bushing 28. If the radial projection 40
If it does not move so as to accurately engage one of the grooves 42 of the base 26, the base will protrude rearward from the bayonet bushing 28.

Finally, a further advantage over the prior art mentioned earlier, namely the longitudinal groove 42 required for protection against rotation, is that the length of the transmission of the pressing force during punching can be adjusted. Has the advantage of not weakening the screw portion required for Since the longitudinal grooves 42 are located on the outer peripheral surface of the base 26, even if the punch 10 has only a relatively small circular or other shaped cross-section, several grooves can be created without difficulty. The longitudinal groove 42 can be cut.

In particular, the insert bush 28 and the guide bush 1
With respect to the connection between them and the shape of the insert bushing 28 and its connection with the rear spring receiver 36, further modifications and designs are possible beyond the details described above. Because the punches 10 are connected to each other
The bushings 12, 28 can be easily pulled out from the two bushings 12, 28 to the rear thereof, so that the bushings 12, 28 can be fastened in place, for example by means of screw connections, plug-in means,
Alternatively, they can be connected to each other by other suitable means, as in the case of a screw connection, the setting of the pre-loaded compression spring 38 being provided there. In addition, this is similar to the embodiment shown in FIGS. 1 and 2, even with only a few longitudinal grooves 42 formed on its outer peripheral surface, as a whole with respect to the guide bush 12. By rotating either the bayonet bushing 28 or the rear spring receiver 36, or by re-securing the screw connection in place, there are options to achieve a better adjustment of the overall length of the punch 10 and punch driver 22. provide. The small changes that occur in the preload of the compression spring 38 in this case are generally not significant.

In the embodiment shown in FIGS. 1 and 2, when the reverse stroke of the unit constituted by the punch 10 and the punch driver 22 is not limited, the punch driver 22 having the base 26 is provided with a spring. Due to the powerful and abrupt action of 38, it can pop out from bayonet bush 28 until it projects larger or smaller rearward.
This undesirable long reverse stroke is damped by a brake cling, such as an O-ring, inserted in the rear spring receiver 36. However, this also has the disadvantage that the base 26 of the punch driver can no longer be easily removed from behind the bushing 28. On the other hand, punch 1
0 and a punch driver 22
It can be very easily and easily pulled out of the bushing 28 partially or completely behind it,
On the other hand, the latch 46 shown in FIG. Rear spring receiver 36
Are provided rotatably. The latch has the form of a two-armed lever. Pin 48 used as a rotating shaft
Is horizontal and tangential to the rear spring receiver 36 in the position shown. In this manner, the latch 46 is provided on the rear spring receiver 36 within a slit that extends substantially in its axial and radial directions and is not completely cut away to form a connecting contact 82, within a certain extent about the axis. To rotate. The spring wire 50, which applies rotational pressure to the front end 68 or lower portion of the latch 46 from outside, has a tendency to continuously rotate the latch 46 to the locked position shown in FIG. The latch 46 is a punch driver base 26.
Prevent the bushing 12, 28 from retracting rearward or upward. In this position, the latch 46 engages a groove 52 that extends axially on the periphery of the punch driver base 26 to form a connection for connecting the bushings 12, 28 and the base. This axially extending groove 52
The front end or lower end is closed by an end wall 96 forming the shoulder 54 symmetrically with the continuous groove 42 opening at both ends. In the exemplary embodiment, four grooves 52 are formed that are evenly distributed around the circumference of the punch base 26, each groove being at an intermediate position between the two grooves 42 and having a latch. 46 has 13 on its circumference relative to the radial projection 40.
They are offset by 5 °.

In the lock position set in the normal state by the spring wire 50 according to FIG.
Since the latch 46 has a position where its front end 68 faces radially inward while remaining slightly inclined elastically,
The latch is inserted when a unit including the punch 10, the punch driver 22, and the punch driver base 26 is inserted.
The punch driver base 26 can be removed radially outward from the front end. However, the end wall of the groove 52 forming the shoulder 54 passes over the latch 46,
As soon as the punch driver base 26 is supported by the intermediate ring 44, the front or lower end of the latch 46 snaps into the groove 52 at the back of the shoulder 54 so that the punch driver 22 and punch 1
Prevents backward movement of 0.

In order to release the lock of the punch driver, the pressing means applies a pressing force radially inward to the operation button 56 inserted into the through hole at the rear end of the bushing 12,28. Used. For example, operation button 5
6 is manually pushed, the upper end or the rear end 70 of the latch 46 is pushed from the outside in the direction of its rotation.
6 is rotated about its axis to the clockwise position, and is rotated about its axis to the release position or the unlock position against the urging force of the spring wire 50, in which position it is no longer engaged with the groove 52. As a result, the punch driver 22, the punch driver base 26, and the punch 10 can be pulled backward or upward from the bushings 12, 28.

The operation button 56 has a large-diameter head at its radially inner end, so that the operation button 56 does not fall out of the hole receiving it.

At the time of assembly, the rear spring receiver 36 is
From above or behind, it is inserted axially into the insert bushing 28. At the peripheral position where the operation button 56 is arranged, the rear spring receiver 36 has an axial groove 58 on the outer peripheral surface thereof. It is closed at the end. The groove 58 is wide and deep enough to receive the head of the operation button 56. Therefore, the operation button 5
6 is held in a restrained state after the rear spring receiver 36 is assembled. Since the large-diameter head abuts on the upper end of the latch 46, the operation button is normally held at a radially outer position by a spring wire 50.

As can further be seen from FIG. 3, the annular groove 90
Is cut out and formed on the inner peripheral surface of the insertion fitting bush 28 at a predetermined distance from the rear end portion 88, and is separated from the rear end portion 88 of the rear spring receiver 36 by a distance substantially equivalent to the above distance. An annular groove 92 is formed on the surface. In the assembled state, these two annular grooves are arranged opposite to each other and define an annular cavity 60 in which two radially measured diameters are arranged opposite each other. A flexible wire 62 that is larger than the depth of each of the annular grooves can be inserted through the walls of the bushing 12, 28 from a generally tangentially oriented hole (not shown). As a result of the insertion of the wire 62, the rear spring receiver 36 is fixed at a predetermined position in the axial direction.

In another preferred embodiment of the invention shown in FIGS. 4 and 5, the punch 10 'is guided in a guide bush 12' for receiving the punch and is axially removable. The guide bush 12 'is fixed to a frame of a device (not shown) by screws or the like. Also in the conventional method, the stripper plate 14 'is provided with the guide bush 12'.
Is detachably attached to the front end or lower end of the punch 1 during punching.
It works to remove from the front end of 0 '.

The rear end or upper end of the punch 10 'is connected to a lower member 18' of a punch driver comprising two parts,
It is fixedly connected by fixing screw means 16 '. The lower or front punch driver member 18 'is provided with a guide key 20 provided between the punch driver member 18' and the punch 10 '.
Is secured against rotation by spline means such that its radially outer end engages a linear groove 22 'in guide bush 12'. The punching force is applied to the punch 10 ′ and the lower punch driver member 1 sandwiched by the axial fixing screw 16 ′ having the thread 44 ′.
8 '.

The lower punch driver member 18 'has a relatively large and deep screw hole 24' at its rear end or upper end, and an upper or rear punch driver member having an external thread formed in the screw hole. The 26 'shaft can be screwed on. The upper punch driver member has at its rear end a base 28 'projecting in the radial direction.

The lower punch driver member 18 'is guided movably in the axial direction in the sliding bushing 30' and subsequently guided in the rear area of the guide bushing 12 '. When the sliding bush 30 'is pulled rearward, the flange-like widening formed at the front end of the sliding bush 30' abuts on the rear end or the upper end wall of the guide bush 12 ', whereby the sliding bush 30' is rearward. Movement to is restricted. A linear groove in the lower punch driver member 18 'or in the guide bush 30' and cooperating with a groove engaging protrusion (not shown) on each other portion or rear end wall of the guide bush 12 '. (Not shown), the sliding bush 30 '
The rotation remains fixed with respect to the guide bush 12 ', the punch 10' and the lower punch driver member 18 '. This means may comprise, for example, a guide pin fixed to the sliding bush 30 'by a fixing screw shown in dash-dot lines in FIG.

The sliding bush 30 'has an internal thread formed at its rear end or upper end, into which an annular portion of a ring-shaped spring seat 32' having an external thread can be screwed. The spring seat protrudes beyond the outer peripheral surface of the sliding bush 30 ', and the compression spring 34
Form a support or spring receiver for the '. In this example, the compression spring has a plurality of disk springs arranged continuously. The compression spring 34 'is sandwiched between the rear end wall of the sliding bush 12' and the spring seat 32 '. The spring preload can be adjusted by rotating the spring seat 32 'with respect to the sliding bush 30'. Thereafter, the spring seat 32 'is secured against rotation with respect to the sliding bushing 30' by fixing screw means, adhesive, or other suitable means. In the assembled state, a fixing ring 36 ′, such as a snap ring, having an outer diameter larger than the inner diameter of the spring seat 32 ′, is located immediately below the annular portion of the ring seat 32 ′ and above the punch driver member 26 ′. Is mounted in a ring-shaped groove on the outer peripheral surface of the. It prevents the upper punch driver member 26 'from being unscrewed or pulled rearward from the sliding bush 30'.

In an exemplary embodiment, the base 28 'projecting radially of the punch drivers 18', 26 '.
Has a groove extending in the radial direction below the spring seat 32 ', and a push button 38' which can be brought into contact with the peripheral surface of the punch driver base 28 'as a detachable fixing member in the groove. Are guided in the radial direction. This push button is acted upon by a compression spring 40 ', which acts on the base 2 of the punch driver.
8 'and pushed radially outward to urge the push button 38' into the locked position, in which the push button 38 'is oriented axially with respect to the longitudinal axis of the punch. Are engaged with the linear grooves 42 'inside the spring seat 32'. For example, 2
Any number of straight grooves 42 ', such as 6 or 8, are evenly formed on the outer periphery of the spring seat 32', and the axially projecting portion of the push button 38 'selectively engages one of them. I can do it. If the push button 38 'is pressed radially from the outside, its axial projection will be displaced from the linear groove 42' in the spring seat 32 ', as shown in FIG. And the upper punch driver member 26 'can be unscrewed from the sliding bush 30' and the spring seat 32 '.

The upper punch driver member 26 'has a central shaft hole 44' which is used to connect the punch 10 'to the lower punch driver member 18'.
Are on the same straight line as. The hole 44 'is large enough to allow a screwdriver to pass through the hole 44' to the hex socket at the rear end of the screw 16 '. The rear end of the hole 44 'is threaded so that a support bolt that allows the punch unit to be suspended can be screwed in to lift and transport the punch unit.

To disassemble the punch unit, the push button 38 'is pushed in radially, where the base 28' of the upper punch driver member 26 'is moved downwards or the punch driver unit 18' is moved downward or forward. It is rotated in the direction away from the upper punch driver 26 ′. After removing the stripper plate 14 ',
The punch 10 'and the lower punch driver member 18' can be pulled down or forward from the sliding bush 30 '. During this rotational movement, the retaining ring 36 'prevents the upper punch driver member 26' from escaping the sliding bush 30 'toward its top. The remaining portion of the punch unit can be separated after the fixing or stopping between the spring seat 32 'and the sliding bush 30' is released and the fixing ring 36 'is removed.

If the lower punch driver member 18 '
If only the punch 10 is to be removed instead of the punch 10, a screwdriver is passed through the hole 44 'from the punch and the punch 1 is removed.
It is possible to unscrew the screw 16 'inserted into the through hole in 0'.

The punch 10 'or the punch 1 held together
Reassembly of the units of the 0 'and lower punch driver members 18' are each performed in the reverse order of the disassembly described above. If only the punch 10 'is removed for regrind, push the push button 38' until the lower end of the externally visible punch reaches the correct position with respect to the stripper plate and pushes upward. After reassembly, which changes the axial relative position between the upper punch driver member 26 'and the lower punch driver member 18' by rotating the base 28 'of the punch driver member 26', The amount that became
It can be easily and simply supplemented. Upper punch driver member 26 'and lower punch driver member 18'
When the pitch of the screw is known, the rotation of the upper punch driver member 26 'required to compensate for the shortened portion of the punch 10' depends on the number of divisions of the linear groove 42 '. You can also know. If the axial projection on the push button 38 'can then re-enter one of the linear grooves 42' in the spring seat 32 ', all parts are locked against rotation.

It can be appreciated that each member of the punch unit can have a different shape than that shown. In each case, the upper punch driver member 22 ′ and the spring seat 32 ′ are moved to the locked position by one of the push buttons 38 ′ or the two push buttons 38 ′ provided at the radially opposed positions. A locking mechanism having a plurality of spring-loaded spheres can be employed to fix the predetermined relative rotational angular position between the two. This locking mechanism must be adjusted so that it can overcome the predetermined torque applied on the base of the upper punch driver member 26 '. Further, the punch drivers 18 'and 26' can be employed as an integral part, and can be connected to the punch 10 'via adjustment screws.

In another preferred embodiment of the present invention, as shown in FIGS. 6 to 12, a punch unit 1 "is provided with a punch 10 which is guided linearly movable within a guide bush 12". Guide bush 1
Rotation of the punch 10 "relative to 2" is prevented by rotation blocking means, such as pins 14 ", which are fixed in radial holes 15" of the punch 10 ". The pins 14" protrude radially and are guided. The bushing 12 "engages an inner longitudinal groove 16". The axial groove 17 "opens radially outward, so that a second pin or other securing member on the frame (not shown) of the device can engage the groove 17" from the outside, The guide bush 12 "on the device frame (not shown) can be held against rotation. The stripper plate 18"
0 "is fixed to the lower end of the guide bush 12" by being loaded.

The rear end or the upper end of the punch 10 "is connected to a punch driver 22". To compensate for the loss of length caused by regrinding the punch 10 ', the punch 10 "and the punch driver 22" adjust the joint length of the two by screwing the screwed joint relative to each other. They are connected by a screw connection as possible. In the embodiment shown in FIG.
The rear end of the 0 "is provided with a screw hole 23", which is screwed to the front end 24 "of the punch driver 22 'where the external screw 25" is formed. The total length of the punch 10 "and the punch driver 22" is set by rotating the front end 24 "of the punch driver 22" and the screw hole 23 "of the punch 10" with respect to each other, and changing the amount of rotation.
A punch head 26 "mounted behind the punch driver 22" receives a force generated by a punching device (not shown) that operates the punch unit 1 ".

In the embodiment shown in FIGS. 6 to 11, the punch unit 1 "is extended rearward by a housing 34", and the housing is provided with a flange 2 fixed to its rear end.
9 ", wherein the housing 34" has a compression spring 32 "acting between the front and rear stop surfaces.
Surrounded by A mating bushing 28 "surrounds the housing and spring. The mating bushing 28" has an inner thread at the rear end and a collar 29 "on it.
Are screwed in as a ring-shaped insert. The fixed flange 29 "receives the punch head 26" in the axial direction, and the punch head 26 "is prevented from coming off by the C-ring 30". The front side of the shoulder of a given collar 29 "constitutes a rear stop surface 31" or a rear spring seat for the compression spring 32 ". The front stop surface or front spring seat 33" is provided at the shoulder of the housing 34 ". Formed by the rear side.

In the assembled state shown in FIG.
A locking pin 35 "or other type of radial protrusion engages around the outer circumference of the punch head 26". In this way, the punch driver 22 ″ is connected to the housing 3
4 ", bushings 23" and 12 ", and therefore fixed against relative rotation with respect to punch 10". The combined punch 10 'and punch driver 22 "can be guided through the interior of the housing 34" to perform the punching. An annular ring 36 "is fitted into a groove 37" formed inside the housing 34 "and near the front stop surface 33". The annular ring 36 "can be formed of rubber, and is formed with the punch driver 22" so that the punch driver 22 "does not easily fall off the rear end of the punch unit 1" when the C ring 30 "is removed. A weak frictional contact is provided, however, this weak frictional contact is not sufficient to prevent the punch driver 22 "from coming off the punch unit 1".

During the punching process, the guide bush 12 ″
During punching, the pin 14 "of the punch 10" is guided along the inner longitudinal groove 16 ". The guide bush 12" is rotatable with respect to the housing 34 ". Accordingly, it is attached to the housing 34 "of the punch driver 22".

The punch unit 1 ″ according to the present invention also includes
Preferably, a punch 10 "and a punch driver 12"
An index member for controlling the relative rotation of is adopted. The indicator member can be constituted by a connection connecting the housing 34 "and the guide bush 12" in the circumferential direction.

Referring to FIGS. 6 to 10, the indicator means is located around the upper end around the guide bush 12 ".
It may be comprised of a number of snap-fit projections, such as a detent mechanism 64 ", which fits into a pawl hole 65" formed in the guide bush 12 ". It is axially positioned to fit or be received by seat means, such as a pawl receiving seat 66 ", which is located at a uniform location about the bottom edge around the housing 34". In a more preferred embodiment. There are three detent mechanisms 64 "arranged around the upper peripheral surface of the guide bush 12", the detent mechanism being selected from among eight pawl receiving seats evenly arranged in the housing 34 ". Fit one. Alternatively, the pawl hole 65 "/ detent mechanism 64" can be located on the housing 34 "and the pawl receiving seat 66" can be located on the guide bush 12 ".
Also, one detent mechanism 64 "and a plurality of pawl receiving seats 66", or one detent receiving seat 66 "or a plurality of detent mechanisms 64", or other combinations thereof may be used.

The detent mechanism 64 "comes from the prior art and has the ball bearing biased by a spring against a rim or edge. The rim or edge has a smaller perimeter than the outer circumference. Thus, the portion of the ball bearing protrudes from the member, but is pushed back into the member when the spring force is overcome.
The ball bearing of each detent mechanism has a pawl receiving seat 6
6 "to achieve rotation of the guide bushing 12" with respect to the housing 34 "without having to release or disengage anything, for indication by discontinuous rotation of the guide bushing relative to the housing. be able to.
When the detent mechanism 64 "is mounted on the pawl receiving seat 66", the guide bush 12 "will not rotate during normal operation on the housing 34".

To achieve the punch length adjustment, the guide bush 12 "is moved relative to the housing 34" at a discrete amount of rotation defined by a detent mechanism 64 "adapted to the pawl receiving seat 66". An index is given in the direction of rotation. This discontinuous rotation rotates the screw connection between punch 10 "and punch driver 22".
Since the pitch angle of the thread frictional fixation of the punch 10 "to the punch driver 22" is known, the amount of length adjustment achieved by this discontinuous rotation is also known.
Therefore, even if the punch 10 "is worn, the length can be adjusted simply, quickly and accurately by simply rotating the guide bush with respect to the housing. The punch 10" and the punch driver 22 " A visible marker (not shown) can be attached to the outer peripheral surface of the fitting bushing 28 "to make the setting of the overall length of the bushing easier.

FIG. 8 depicts a modification of the embodiment of FIG. 7 to apply in cases where a strong rotational force is exerted on one main part or the other during normal operation. This variant shows a locking means in which a snap-fitting projection is in the form of a post 80 ", which is inserted axially into an axial hole 82", When the other ball-shaped projection 64 "is similarly placed on the other pawl receiving seat 66", the housing 3
The spring 8 is arranged to match one of the pawl receiving seats evenly distributed around the bottom end of the 4 "circumference.
The 4 "is located at the bottom of the axial hole 82" to bias the post 80 "upwards toward the pawl receiving seat 66". A pin 86 "is radially disposed within a pin hole 87", which pin 86 "contacts a shoulder 89" near the top 88 "of the column 80" and the column 80 "is pivoted. Guide bush 1 is restricted so as to restrict outward movement from directional hole 82 ".
The groove 92 "is disposed at the periphery of the top portion of the column 2".
It is open in an axial hole 82 "to expose the 0" side. The post 80 "additionally has ridges, bumps, or the like 94" to provide a frictional engagement between the post itself and the user's thumb, and the user may place the thumb on the post 8
Pressing down against the spring 84 "while still contacting the 0" release the column top 88 "from the pawl receiving seat 66" so that the user can manually move the guide bushing against the housing 34 ". 12 "can be rotated.

7 to 10, the guide bush 1
The 2 "connection means comprises two push-buttons 53" arranged radially opposite each other around the upper periphery of the guide bush 12 ".
Placed vertically in a hole oriented at right angles to the 5 "
The radial holes restrict the movement of the push button 53 "in the radial direction and support the push button 53" so that the push button 53 "does not fall outward in the radial direction.

When the guide bush 12 "is engaged with the housing 34", the push button 53 "is urged outward by the main fixed C-ring 56". This main fixed C-ring 56 "(shown in FIGS. 9 and 10) is mounted in a groove 57" cut into the housing 34 "around the outer periphery of the housing 34". It is fixed by a pin 60 "for preventing rotation.
The main fixed C-ring 56 "has two radial projections 61".
The protrusion extends slightly beyond the radius of the groove in the housing 34 "and the housing and engages an inner groove 58" formed in the upper inner peripheral surface of the guide bush 12 ".

Guide bush 12 "and housing 34"
Rotates the guide bush 12 "with respect to the housing 34" so that the push button 53 "matches the radial protrusion 61", and pushes the push button 53 "to the radial protrusion 6".
Separated by pushing inward against 1 ".
This separation occurs as a result of the protrusion 61 "no longer extending into the inner groove 58" of the guide bush 12 ".

FIG. 6 shows the connected guide bush 12 "and the housing 34". When connecting these parts, the housing 34 "is inserted into the upper end or the rear end of the guide bush 12" and the radial projection 61 "is inserted.
Abuts against a downwardly and radially inwardly bent edge 62 ". The inwardly bent edge 62" is provided above an inner groove 58 "of the guide bush 12" and has a protrusion 6 ".
The radial projection 61 "is prevented from being biased outwardly until the 1" is restored by the biasing force of the C-ring 56 "into the inner groove 58" of the guide bush 12 "and snapped into place. FIG. 10 shows the outward biasing of the radial projection 61 "caused by the spring action of the fixed C-ring 56".
The pawl receiving seat 66 "is shown at a dimensioned location on the housing 34".

9 and 11, the housing 34 "includes a housing top 39" which slidably engages the bottom 40 "of the housing. As shown in FIG. 9, there are alternating engaging fingers 41 "on both the top 39" of the housing and the bottom 40 "of the housing, these fingers being located elsewhere. The engaging finger 41 "and the groove 41a" cooperate with each other, so that the compression spring 32 "moves the claw end of the engaging finger 41" to the bottom of the groove 41a ". Can not be compressed beyond that point when touching. Movement of the housing top 39 "with respect to the housing bottom 40" is accomplished by the annular ring 43 "and the top and bottom front convex surfaces 4".
Movement toward each other is limited by engagement with the 4 ", and movement toward each other is limited by engagement between the ring 43" and the rear convex surface 45 "of the top and bottom. Front and rear convexes. Both faces 44 ", 45"
It is formed in the radial direction by cutting the 1 "concave portion 46".
These front convex surfaces 44 "are formed at the ends of fingers 41" provided on both the top and bottom portions 34 ", 40" of the housing. Therefore, the rear convex surface 45 "
Are located at the top and bottom 3 of the housing rather than the convex surface 44 ".
9 "and 40" are formed at the proximal ends. When properly assembled and in the rest position before stamping, as shown in FIG. 3, the annular ring 43 "moves axially due to the engagement of the two housing parts with the front convex surface 44". Prevent you from doing so.

The annular ring 43 "can be a solid metal ring with the annular ring 43" oriented at right angles to the horizontal rest position shown in the figure and in the opposite groove 41a "in the bottom 40" of the housing. By placing the ring, it is inserted between parts of the housing. The annular ring 43 "is then adapted to fit between the opposing recesses 46" of the opposing engaging fingers 41 ".
0 ". The housing top 39" is then rotated to the housing bottom 4 "as described above.
The compression spring 32 "is located above the bottom 40" of the housing so that it can engage the 0 "groove 41a". If the compression spring 32 "has sufficient elasticity so that the irregularities of both the housing portions 39" and 40 "are oriented in a horizontal plane, the annular ring 43"
It can be rotated from its vertical insertion position to its horizontal rest position through an opening for receiving a punch driver 22 ".

Alternatively, the annular ring 43 ″ can be a split ring or a C-ring, which is inserted into an uneven (undulating) ring portion and the spring is directed outwardly from the illustrated operating position. By elastic biasing, it can be inserted between the top and bottom housing parts 39 ", 40".

FIG. 12 depicts a variation of the punch unit 1 ″, in which the punch and punch driver are of one-piece construction, rather than the two-part construction as shown in FIG. In order to enable the length change made in the first embodiment, the punch head 7 is formed.
0 "has an internal thread, which comprises an integral punch and an external threaded portion 71" of a punch stem 72 ". All other portions are similar to those of FIGS. This is the same as the embodiment.

In a more preferred embodiment, the housing 3
The projections on the 4 "or guide bushing 12" are spring resiliently biased to their respective receiving seats on other members, but the housing 34 "and the guide bush 1".
When employing opposing radial surfaces 2 "above, other than spring biasing, for example, by manual force, either through the guide bushing or the housing, are pushed through the holes into the respective grooves and locked there by any suitable means. Inelastic protrusions can also be employed.
For example, the axial hole 82 "can extend through the entire guide bush 12" so that an inelastic protrusion, such as a pin, can be inserted from the bottom of the axial hole 82 " To be secured to the receiving seat 66 ", it is secured there, thereby preventing relative rotation of the guide bush 12" and the housing 34 ".

Having described fairly detailed embodiments of the present invention, a wide variety of embodiments will be apparent to those skilled in the art without departing from the scope of the claimed invention.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment of a punch unit, partially showing a partially assembled state in a cross section.

FIG. 2 is a view corresponding to FIG. 1 with each portion in a sufficiently axially separated position so that relative rotation of each of the upper portion with respect to the lower portion is possible;

FIG. 3 is an enlarged cross-sectional view showing a part of an upper portion of another embodiment of the punch unit rotated 135 degrees from FIGS. 1 and 2;

FIG. 4 is an axial longitudinal sectional view showing another embodiment of the punch unit according to the present invention, showing a state in which the punch still has an original length.

FIG. 5 is a longitudinal sectional view of the punch unit corresponding to FIG. 4, showing the punch re-ground and thereby shortened.

FIG. 6 is a central sectional view showing another embodiment of the punch unit according to the present invention in a completely assembled state.

FIG. 7 is a side view of a lower part of the punch unit shown in a cross section in FIG.

FIG. 8 is a view similar to FIG. 7 with modifications;

FIG. 9 is a center sectional view of an upper portion of the punch unit with a punch driver removed.

FIG. 10 is a sectional view taken along line 4-4 in FIG. 9;

FIG. 11 shows a top housing part and a bottom housing part arranged axially but not arranged in the direction of rotation for the purpose of illustration, and cooperating with a ring shown in cross section FIG.

FIG. 12 is a central sectional view similar to FIG. 6, but showing a modified embodiment of the punch unit of the present invention, in which the punch and the punch driver are configured as an integral part.

[Explanation of symbols]

 Reference Signs List 10 punch 12 guide bush 22 punch driver 26 base 28 bush 38 spring 40 radial protrusion 42 axial longitudinal groove 54 shoulder 64 front stop surface 66 rear stop surface 84 front end 88 rear end 46 latch 10 'punch 12' Guide bush 16 'Fixing screw means 18' Punch driver member below 20 'Guide key (spline) 26' Punch driver member above 28 'Base 30' Sliding bush 32 'Spring seat 34' Spring 38 'Push button (can be released 1 "punch unit 10" punch 12 "guide bush 22" punch driver 34 "housing 64" snap engagement type projection means (detent mechanism) 66 "sheet means (claw receiving seat)

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 597046063 O. Box 728 6400 Industry Avenue Ramsey Minnesota 55303 Un1ted States of America (72) Inventor Albrecht Schneider Germany 61440 Oberwer Zell im Heidegraben 10 (72) Inventor Richard J. Schweiger USA 55304 Minnesota and Bar N. AW. Macker Street 1479 (72) Inventor Gerd Simon Germany 06116 Chemnitz Michael Strasse 46

Claims (7)

[Claims] A punch driver having a front end and a rear end; a base provided at the rear end; a punch having a rear end connected to the front end of the punch driver; A bush for receiving a punch driver, means for preventing rotation of the punch relative to the bush during a punching stroke of the punch, for guiding axial movement of the punch, and a front stop surface; A bush having a rear stop surface closer to the base than the front stop surface; a spring maintained in a preloaded state between the front stop surface and the rear stop surface; and the rear stop. Connecting means for connecting the bush and the base behind the rear stop surface, and connecting the punch driver with a punch driver And the punch driver is released from the punch, and in order to adjust the punch in the axial direction with respect to the punch driver, a radial projection provided on one of the bush and the base; A connection unit comprising: an axial longitudinal groove formed on the other side; 2. The axial longitudinal groove has a shoulder at one end, the radial protrusion comprises a releasable latch,
The releasable latch is such that when the base attempts to move from the bush, the latch and the shoulder engage each other to prevent such movement, and the latch engages the engagement from the groove. The punch unit according to claim 1, wherein the base is selectively movable in the groove so that the base can be separated from the bush in the axial direction when the base is released. 3. The releasable latch has a two-armed lever having a front end and a rear end and being rotatable around an axis within a limited range, wherein the front end of the lever is Spring means for moving radially inward into a locking position cooperating with the outer shoulder to form a stop and forcing the rear end of the lever radially inward. 3. The punch unit according to claim 2, wherein the punch unit can be moved to a radially outer release position by a pressing unit for the punch unit. 4. A punch driver having a front end and a rear end, having a base on the rear end, and a punch connected to the front end of the punch driver by axial fixing screw means. A guide bush for receiving the punch and guiding the axial movement of the punch, the guide bush having means for preventing rotation of the punch relative to the guide bush during a punching process of the punch; A sliding bush having a bush, a front end and a rear end, and receiving the punch driver, wherein the front end of the sliding bush is guided movably in an axial direction within the guide bush; A spring maintained in a preloaded state between the sliding bush and the base and the guide bush, wherein the base is provided during a punching process of the punch; A spring capable of applying pressure between the guide bush, a spring seat disposed between the slide bush and the base, fixed to the slide bush, and receiving the spring; At least one of the punch driver and the spring seat is provided with at least one releasable fixing means movably provided to engage with the other of the punch driver and the spring seat, and the releasable fixing means is A locking position in which the fixing means is engaged with one of the punch driver and the spring seat to prevent rotation of the punch driver and the sliding bush during the punching process of the punch; Allow relative rotation of at least one of the sliding bushes Punch unit, characterized in that it is movable between an unlocked position of the. 5. A front end of the punch driver is connected to the punch by the axial fixing screw means, and the fixing means for preventing rotation of the punch with respect to the guide bush includes the front end and the punch. The punch unit according to claim 4, further comprising a spline that connects the punch unit to the punch unit. 6. A housing, a punch driver axially received in the housing, a guide bush connected to the housing for rotation with respect to the housing, and a guide bush in the guide bush. A punch operably attached to the punch driver, and a spring means for applying an axial pressure to the punch driver so as to separate from the guide bush; Indicator means for setting the rotational position of the guide bush with respect to the housing, the indicator means being provided on one of the guide bush or the housing and engaging with a groove in the other of the guide bush or the housing. (1) During normal operation of the punch unit,
In the engaged position of the spring-loaded means, the housing and guide bush remain fixed in rotation with respect to each other, and (2) the spring-loaded means is for adjustment purposes. The indexing means, wherein when the means is released, the guide bush and the housing are allowed to rotate relative to each other to adjust the length of the punch. 7. The indicator means is a snap-fit type projecting means and a seat means facing on the guide bush and the housing, wherein in the normal operating position, the projecting means on one of the guide bush and the housing is provided. When the housing and the guide bush are snap-engaged with the seat or mounted on the other of these members and disengaged between the projection means and the seat means for adjustment purposes. Said snap-engaging projection means being rotated relative to each other to allow said housing and guide bush to rotate relative to each other to another rotational position where another projection means and seat means engage. The punch unit according to claim 6, further comprising sheet means.