JPH10231911A - Push-pull device of clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp push-pull device which is embodied in a small and lightweight construction. SOLUTION: A block 7 is fixed to the lower part of a slide in a press machine, and a T-leg 9 of a hydraulic clamp 3 is fitted movably in a T-groove formed in the slide and a T-groove 8 formed in the block 7. The tip 34 of a chain 28 for pushing and pulling is coupled with the T-leg 9, and the chain 28 is pushed and pulled in the longitudinal direction. The clamp 3 is pulled from the advanced position to the retreat position Y, and the T-leg 9 is pressed to the head 83a of a bolt 83 furnished at the starting part of the T-groove 8. This causes the T-leg 9 to be pinched by the head 83a of the bolt 83 and the peripheral wall 8a of the T-groove 8, so that the clamp 3 in standby in the retreat position Y is prevented from rattling by vibrations generated during the press working process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a device for pushing and pulling a clamp.

[0002]

2. Description of the Related Art A push-pull device of this type has been disclosed in Japanese Utility Model Laid-Open Publication No. 60-136826. This is such that the T-leg of the hydraulic clamp is inserted into the T-groove of the slide of the press machine by a push-pull chain so as to be able to move forward and backward. In order to prevent the hydraulic clamp retracted to the standby position from rattling, A dummy block is provided outside the starting end of the T-groove described above, and in a standby state, the dummy block is pressed by the hydraulic clamp described above.

[0003]

The above prior art has the following problems. Since the dummy block protrudes outside the start end of the T groove, the push-pull device becomes large and heavy by the amount of the protrusion. For this reason, the working range around the push-pull device is narrowed, and the workability is reduced. When the standby position of the hydraulic clamp shifts due to a transport error of the push-pull chain or the like, when the hydraulic clamp is operated at the shifted position, the clamp tool hits the dummy block one-sidedly. May be damaged.
Further, when the type of the clamp and the clamping thickness are different, it is necessary to change the dummy block to one having a different thickness in accordance therewith, and the change is troublesome.

An object of the present invention is to make a push-pull device small and lightweight. Another object of the present invention is to prevent damage due to a clamping error when holding the clamp in a predetermined position.

[0005]

In order to achieve the above object, the invention of claim 1 is, for example, shown in FIGS.
Alternatively, as shown in FIG. 8 or FIG. 9, the clamp pushing / pulling device was configured as follows. T leg 9 fitted in T groove 8
, A flexible transmission 28 which is inserted into the T-groove 8 so as to be able to advance and retreat, and is connected to the T-leg 9. Transmission 2
A rotary wheel 22 for pushing and pulling the rotary wheel 8 in the longitudinal direction, an actuator 16 for reciprocatingly rotating the rotary wheel 22,
A receiving portion 83 provided at the starting end of the groove 8, and by pulling the T-leg 9 to the starting end of the T-groove 8 by the rotating wheel 22 via the transmission 28. The clamp 3 can be held at the retracted position Y by pressing the T-leg 9 against the receiving portion 83 of FIG.

The clamp 3 may be a hydraulic clamp or an electric screw clamp. The transmission 28 may be a chain, a toothed belt, a band-shaped member, a wire-shaped member, or the like. In addition, the receiving portion 83 is provided with the T as shown in FIG.
It can be considered that the case is formed separately from the groove 8, or the case is formed integrally with the T groove 8 as shown in FIG. 8 or 9.

The invention of claim 1 operates as follows, as shown in FIGS. 1, 2 and 6, for example. When the clamp 3 at the advanced position X in the two-dot chain line diagram in FIG. 1 is moved to the retracted position Y and held at the retracted position Y in the solid line diagram, first, the transmission wheel 28 is pulled upward by the rotating wheel 22. Then, the T of the above-mentioned clamp 3 is
The leg 9 is moved rightward toward the start end of the T groove 8.
When the T-leg 9 comes into contact with the receiving portion 83, the T-leg 9 is pressed against the receiving portion 83 by the pulling force of the transmission 28. Thereby, the T leg 9
Is clamped between the receiving portion 83 (and the peripheral wall 8a of the T groove 8), so that the clamp 3 can be prevented from moving at the retreat position Y.

[0008] The first aspect of the present invention, as described above,
In holding the clamp at a predetermined position in the T groove, it is not necessary to provide a dummy block outside the start end of the T groove. For this reason, the push-pull device can be made small and lightweight by the amount of omitting the dummy block. As a result, the working range around the push-pull device is widened, and workability is improved. In addition, by omitting the dummy block, the clamp can be retracted by an amount corresponding to the installation space of the dummy block, thereby increasing the allowable mounting size of the fixed object such as a mold.

In addition, the above-described effect can be achieved with a simple configuration in which the T leg of the clamp is pulled toward the starting end of the T groove and the T leg is pressed against the receiving portion, so that the push / pull device is simple and inexpensive. Can be built. Also, unlike the conventional example, there is no need to perform a clamping operation on the dummy block with respect to the dummy block, so that damage to the clamp tool or the like does not occur. Further, since no dummy block is used, there is no need to change the thickness of the dummy block according to the type of clamp or the clamping thickness.

[0010] As shown in the second aspect of the present invention, the rotating wheel 22 is constituted by a sprocket and the transmission 28 is constituted by a chain. When the sprocket wheel 22 is engaged with the sprocket 32, the chain transmission 28 can be strongly pulled and driven by the sprocket wheel 22. For this reason, the T-leg can be strongly clamped by the transmission device to the receiving portion (and the peripheral wall of the T-groove), and the clamp can be reliably prevented from moving at the retracted position.

Further, when the stopper member 86 according to the third aspect of the present invention is provided, the following operation and effect can be further obtained.
That is, while the clamp 3 is waiting at the retreat position Y,
If the driving force of the actuator 16 decreases or disappears for some reason, the clamp 3 attempts to move from the retreat position Y to the advance position X due to the weight of the transmission 28 or the like. However, the stopper 8
6 is switched from the retracted position N to the protruding position M and the stopper 86 is made to face the T leg 9 of the clamp 3, so that the T leg 9 can be prevented from moving more than a predetermined amount. Thereby, it is possible to prevent the clamp from moving forward by mistake.

Further, as shown in the fourth aspect of the present invention, the T leg 9 is formed with a hole 9b for receiving the stopper 86 switched to the projecting position M, and the hole 9b is formed.
When the stopper member 86 is configured to be able to face the peripheral wall of the above, the stopper member and the stop means composed of the driving mechanism are arranged near the retreat position of the clamp, and the stop means protrudes outward. Therefore, the push-pull device can be made compact.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. First, the schematic configuration of the push / pull device will be described with reference to the system diagram of FIG. 1 and the vertical sectional view of FIG. Reference numeral 1 denotes a press machine, and an upper die 4 can be fixed to a lower surface 2 a of a slide 2 by a plurality of hydraulic clamps 3. Here, only one clamp 3 is shown. In the lower part of the slide 2, T-grooves 5 extending in the left-right direction are formed at predetermined intervals in a direction perpendicular to the paper surface. Push / pull device 6 for moving the clamp 3
Are attached to the lower part of the slide 2 corresponding to the respective T-grooves 5. Another T groove 8 communicating with the T groove 5 is formed in the mounting block 7 of the push / pull device 6.
The T-leg 9 of the clamp 3 is movably fitted in the two T-grooves 5 and 8 in the left-right direction.
It is moved to the advanced position X in the two-dot chain line diagram and the retracted position Y in the solid line diagram in the middle.

A piston 12 inserted into the cylinder body 11 of the clamp 3 is connected to the T leg 9. When pressure oil from a hydraulic source P such as an air hydraulic booster is supplied to a hydraulic working chamber (clamping working chamber) 14 formed above the piston 12 via a two-position switching valve 13, the T-leg 9 The cylinder body 11 rises, and the cylinder body 11 presses the upper die 4 against the lower surface 2 a of the slide 2. Conversely, when the pressure oil in the working chamber 14 is discharged to the tank T via the switching valve 13, the cylinder body 11 is lowered by the spring 15, and the pressed state is released. The push-pull device 6 includes a double-acting pneumatic cylinder 16 extending in the vertical direction, and a lower portion of a cylinder tube 17 of the pneumatic cylinder 16 is fixed to the block 7. A piston rod 19 projects upward from a piston 18 inserted into the cylinder tube 17.

A pair of pinions 21 are rotatably supported on the upper part of the piston rod 19, and a pair of racks 26 are fixed to a casing 24 of the push / pull device 6 in a state of extending vertically. Each rack 26 engages with each of the pinions 21 to rotate the same. The pinion 21 has a pair of sprockets.
(Rotating wheels) 22 are fixed coaxially. The diameter D of the pitch circle of the sprocket 22 is set to a value larger than the diameter d of the pitch circle of the pinion 21. Here, the value of D / d is set to about 2.0. 1 and 2, only one of the pair of pinions 21 and 21, the sprockets 22 and 22 and the racks 26 and 26 is shown.

A push / pull chain 28 for moving the clamp 3 has a base end 29 at the lower left and a first end extending upward.
A longitudinal portion 31, an inverted U-shaped U-turn portion 30, a downwardly extending second longitudinal portion 32, a third longitudinal portion 33 extending into the T-grooves 5.8, and the T-leg 9 And a tip 34 that is connected to the front end. A base end 29 of the chain 28 is connected to the mounting block 7 via the cylinder tube 17. The above-mentioned first longitudinal portion 31
And the second longitudinal portion 32 are guided by the first guide 41 and the second guide 42 so as to be able to be pushed and pulled in the vertical direction, respectively, and the sprocket 22 is engaged with the second longitudinal portion 32. In addition, the third longitudinal portion 33 has a T-shaped groove 5.
8 guides it to be able to push and pull in the left and right directions.

1, the piston 18 of the pneumatic cylinder 16 is advanced upward, and the clamp 3 is switched to the retracted position Y. In this state, when the piston 18 is lowered as shown by a two-dot chain line in FIG. 1, the pinion 21 is rotated clockwise by the rack 26, whereby the sprocket 22 is moved to the second longitudinal portion 32. Is driven downward and the third
The longitudinal portion 33 is advanced into the T groove 5, and the clamp 3 is switched to the advanced position X. Conversely, when the piston 18 in the two-dot chain diagram is raised, the pinion 21 is rotated in the counterclockwise direction by the rack 26, whereby the sprocket 22 turns the second longitudinal portion 32 upward. By driving, the third longitudinal portion 33 is retracted into another T groove 8, and the clamp 3 is switched to the retracted position Y.

In this case, if the stroke of the piston 18 and the piston rod 19 is S and the moving length of the clamp 3 is L, L = S × (D + d) / d. Since the value of D / d is set to about 2 as described above, the moving length L is about three times the stroke S. In other words, the stroke S is approximately equal to the required travel length L.
A short length that is only 1/3 times will be sufficient.

The device for expanding and contracting the pneumatic cylinder 16 is configured as follows. An air pressure source 44 such as a compressor is connected to the cylinder 16 by an air pressure supply / discharge unit 45. That is, when the cylinder 16 is extended, the three-position switching valve 46 is switched to the extension operation position A. Then, the compressed air of the air pressure source 44 is supplied to the expansion working chamber 37 via the check valve 47, and the compressed air in the contraction working chamber 38 is discharged to the atmosphere side through the speed control valve 48. . When the cylinder 16 is contracted, the switching valve 46 is switched to the contraction operation position B. Then, the compressed air of the air pressure source 44 is supplied to the contraction working chamber 37 through another check valve 49, and the extension working chamber 3
The compressed air in 7 is discharged to the atmosphere through another speed control valve 50.

When the cylinder 16 (and the chain 28) is stopped at a desired position during the movement, the switching valve 46 may be switched to the stop operation position C. More specifically, the supply port 52 for extension and the supply port 53 for contraction of the cylinder 16 are connected to the brake means 55 by the shuttle valve 54.
Selectively connected to Although the specific structure of the brake means 55 will be described later, the brake means 55 holds the piston rod 19 at a desired height by a brake spring 55g (not shown).

When the switching valve 46 is switched to one of the extension operation position A and the contraction device position B and compressed air is supplied to one of the working chambers 37 and 38, the compressed air is compressed. Air is supplied to the brake means 55 through the shuttle valve 54, and the brake state is released against the brake spring. On the other hand, when the switching valve 46 is switched to the stop operation position C and the compressed air is discharged from both of the working chambers 37 and 38, the compressed air supplied to the brake means 55 is discharged. The air is discharged to the atmosphere via the shuttle valve 54, and the brake means 55 is switched to the brake state by the brake spring.

When the clamp 3 is moved backward by the pneumatic cylinder 16, it is determined that the piston rod 19 has risen most.
And a detection signal of the clamp retreat position is output. When the clamp 3 is advanced by the cylinder 16, the contact 58 a of the die detection limit switch 58 is connected to the flange 4 a of the upper die 4.
Is detected, and a detection signal of the clamp advance position is output. Further, when the clamp 3 is erroneously advanced and driven when the upper die 4 is not loaded below the slide 2 or when the loaded upper die 4 is abnormally small, the cylinder 16 exceeds the set amount. Since the contraction is performed, the abnormal advance detection limit switch 59 detects the contraction, and an abnormal signal is output.

The specific structure of the above-described push-pull device 6 is as follows.
3 to 6 with reference to FIGS. 1 and 2 of the above. FIG. 3 is a sectional view taken along the line III-III in FIG. FIG. 4 is an enlarged sectional view taken on line IV-IV in FIG. FIG. 5 is an enlarged sectional view taken along line VV in FIG. FIG. 6 is an enlarged schematic view of the main part in FIG.

As shown mainly in FIGS. 2 and 3, the die detecting limit switch 58 and the plate 61 are fixed to the upper surface of the cylinder body 11 of the clamp 3.
The tip base 63 of the hydraulic hose 62 is connected to the plate 61. The base end cap 64 of the hydraulic hose 62 is connected to the oil supply / discharge passage 65 of the mounting block 7 described above. Reference numeral 66 denotes an oil supply / drain port. At the time of clamping, the pressure oil of the hydraulic pressure source P passes through the supply / discharge port 66, the hydraulic hose 62, and the oil passage (not shown) in the plate 61 in this order, and the hydraulic operating chamber 14. At the time of unclamping, the pressurized oil in the working chamber 14 is discharged to the oil tank T through a reverse path. The electric cable 68 of the limit switch 58 and the hydraulic hose 62
It is inserted into the chain 28 in the longitudinal direction and is moved simultaneously with the clamp 3.

The mounting block 7 is fixed to the lower right of the slide 2 by four bolts 70. The casing 24 is fixed to the block 7 and the pneumatic cylinder 16 is fixed by a plurality of bolts 71.

As shown in FIG.
The housing 55a is provided with an end plate 16a of the cylinder 16 described above.
It is fixed to. Shuttle valve 5 described with reference to FIG.
When the compressed air of No. 4 is supplied to the pneumatic working chamber 55c above the piston 55b through the supply / exhaust port 56 of the end plate 16a, the piston 55b and the plurality of balls 55d descend, so that the annular collet 55e expands. The diameter of the piston rod 19 is allowed, and the holding state of the piston rod 19 is released. Reference numeral 55f denotes a groove of the collet 55e.

On the other hand, when the compressed air is discharged from the pneumatic working chamber 55c, the ball 55d is raised by the brake spring 55g via the cam surface 55h of the piston 55b. Thereby, the collet 55e
Is reduced in diameter to maintain the piston rod 19 at a predetermined height. The ball 55d is urged upward by an alignment spring 55i.

A shaft 73 is fixed to the upper part of the piston rod 19 by a fixing bolt 72. Two sliding bearings 7 are provided on both sides of the shaft 73, respectively.
The sleeve 76 is rotatably supported via the bases 4 and 75. The pinion 21 and the sprocket 22 are formed integrally with each sleeve 76.

A guide block 77 is inserted between the pair of sleeves 76 from above, and the guide block 77 is fixed to the shaft 73 with the use of the fixing bolt 72. The guide block 77 prevents the chain 28 from getting entangled or caught in the sprocket 22.

A rolling member 79 made of a radial bearing is externally fitted to each end of the sleeve 76. The rack 26 and the guide rail 80 are fixed to the side plates 24a facing each other of the casing 24 at a predetermined interval. Another guide rail 26a is formed by the surface of the rack 26 that connects the tooth tips. The rolling member 79 is fitted between the facing guide rails 26a and 80 so as to be vertically movable.
As shown in FIG. 3, a contact 57 a of the limit switch 57 for detecting the retreating end and a contact 59 a of the limit switch 59 for detecting an abnormal advance are opposed to the rolling member 79.

The push / pull chain 28 is of a one-sided type, and the base end 29 is fixed to the pneumatic cylinder 16 via an adjustment bolt 81 and a bracket 82. Rollers 95 and 96 described below provided on the chain 28
The first guide 41 and the second guide 42 for guiding the above are provided on the other side plates 24b of the casing 24.

As shown mainly in FIG. 6, a bolt 83 serving as a receiving portion is screwed and fixed to the upper portion of the peripheral wall 8a at the start end of the another T groove 8. Then, the pneumatic cylinder 16 is extended, and the T-leg 9 is inserted into the T-groove 8 through the sprocket 22 and the chain 28.
, The T-leg 9 is pressed against the head 83a of the bolt 83. As a result, the T leg 9 is fixed to the head 83 a of the bolt 83 and the peripheral wall 8 of the T groove 8.
a, and the clamp 3 is held at the retracted position Y. For this reason, even during the operation of the press machine 1, it is possible to prevent the clamp 3 in standby at the retreat position Y from vibrating due to the impact from the slide 2.

If the pressure in the working chamber 37 for extension of the pneumatic cylinder 16 drops or disappears for some reason while the press machine 1 is stopped or stopped, the chain 28 is stopped. The tip 34 of the same chain 28 and the clamp 3 try to move from the retracted position Y to the advanced position X due to its own weight or the like. Therefore, stop means 8 for preventing the clamp 3 from moving forward.
5 is provided above the peripheral wall 8a of the T groove 8.

The stopper means 85 is a stopper member 8 which is inserted in the mounting block 7 in an oil-tight manner so as to be vertically movable.
6, its stopper member 86 and lid bolt 87 (see FIG. 2)
And a spring 89 for raising and returning the stopper member 86, and a spring receiver 90 provided above the stopper member 86. The stop operation chamber 88 communicates with the oil supply / discharge passage 65 described above. A hole 9b for receiving the lower portion of the stopper 86 is formed in the bottom surface 9a of the T-leg 9.

When the hydraulic clamp 3 is operated at the retracted position Y, the oil supply / drain passage 65
The stopper oil 86 is supplied to the stop operation chamber 88 from above, and the stopper oil 86 moves down to the hole 9b of the T-leg 9 and is switched to the protruding position M by the pressure oil. It faces the peripheral wall of the hole 9b. Thus, as described above, even if the pressure in the extension working chamber 37 decreases or disappears, it is possible to prevent the clamp 3 from erroneously moving forward. On the other hand, when the clamped state of the clamp 3 is released when the clamp 3 at the retreat position Y is moved to the advance position X, the pressurized oil is discharged from the stop operation chamber 88 at the same time.
Thereby, the stopper member 86 is connected to the return spring 8.
9 and is switched to the retracted position N, so that the clamp 3 is allowed to move forward.

Next, a portion of the chain 28 near the center in the longitudinal direction (that is, the first longitudinal portion 31 and the U-turn portion 30).
And the detailed structure of the second longitudinal portion 32) will be described mainly with reference to FIG. FIG. 7 is an exploded perspective view of two link members 91 and 92 adjacent to the chain 28. One of the adjacent link members 91, 92 is formed in a substantially U-shape,
A left side wall 91a, a right side wall 91b, and a bottom wall 91c are provided. The other link member 92 is formed in a substantially inverted U-shape, and includes a left side wall 92a, a right side wall 92b, and a top wall 92.
c.

The left side wall 91 of the one link member 91 described above.
a left pin 93 projecting leftward and outward at two places before and after a.
93 is inserted. The large diameter portion of each left pin 93 is fixed to the left side wall 91a by welding. Also, the right wall 91
Right support holes 97 are penetrated at two places before and after b.
2 before and after the right side wall 92b of the other link member 92
Right pins 94, 94 projecting rightward outward are inserted into the locations. The large diameter portion of each right pin 94 is fixed to the right side wall 92b by welding. In addition, 2 before and after the left side wall 92a
Left support holes 98 are pierced at the locations.

When the two link members 91 and 92 are connected to each other, the right pin 94 of the other link member 92 is fitted into the right support hole 97 of the one link member 91 and the other link member 92 The left support hole 98 is externally fitted to the left pin 93 of the one link member 91. Thereby, the left side wall 91a of the two link members 91 and 92
The right side walls 91b and 92b are swingably connected to each other by the right pin 94.

As shown in FIG. 4, the left and right pins 93
The left and right rollers 95 and 96 are rotatably supported by the 94. These left and right rollers 95 and 96 are supported by the first guide 41 and the second guide 42, and are inserted into the T-grooves 5.8 so that they can move forward and backward.
(See FIGS. 1 and 2). The hydraulic hose 62 and the electric cable 68 are connected to the left side wall 9 of the chain 28.
1a / 92a, right side walls 91b / 92b, and bottom wall 91
c and the top wall 92c.

As shown in FIG. 2, one link member 91 and the other link member 92 are alternately connected at an intermediate portion of the chain 28 in the longitudinal direction.
In the longitudinal portion 33, two other link members 92 of the same are connected and one link member 91 is connected. This prevents the vicinity of the distal end 34 of the chain 28 from interfering with the hydraulic hose 62 or the like.

The other link members 92, 92
When connecting them side by side, the rear member may be arranged in front and rear opposite to the front member, and these two members may be connected by pins. The one link member 9
The same applies to the case where 1.91 are connected to each other.

The device of the above embodiment has the following advantages. Since the pneumatic cylinder 16 is configured to be double-acting and the expansion pressure port 52 and the contraction pressure port 53 are selectively connected to the pneumatic working chamber 55c of the brake means 55, By switching the three-position switching valve 46, the chain 28 can be pushed and pulled by the inching operation, and the positioning accuracy of the hydraulic clamp 3 is improved. In addition, the urging force of the brake spring 55g causes the piston rod 19
Can be automatically applied, so that even if the compressed air disappears or drops, the clamp 3 can be prevented from moving halfway.

Each of FIGS. 8 to 10 shows a first modification to a third modification, in which members having the same configuration as in the above embodiment are assigned the same reference numerals in principle. 8 is a diagram corresponding to FIG. 6 described above, and differs from FIG. 6 in the following point. That is, by switching the stopper member 86 of the stop means 85 to the projecting position M, the stopper member 86 faces the upper front surface of the T leg 9. Further, the receiving portion 83 is formed integrally with the peripheral wall 8a of the T groove 8.

The second modified example of FIG. 9 is a diagram corresponding to FIG. 6 above, and differs from FIG. 6 in the following point. A T-leg 9 is provided on an upper portion of a housing 3a of the hydraulic clamp 3, a swing arm 3b is supported on a lower portion of the housing 3a, and a right swing end of the arm 3b is driven by clamping. Further, the stopper member 86 of the stop means 85 discharges the pressure oil from the oil supply / discharge oil passage 65 to be lowered to the projecting position M by the projecting spring 99, whereas the oil supply / discharge oil passage When the pressurized oil is supplied to 65, it is raised to the retreat position N. The receiving portion 83 is formed integrally with the peripheral wall 8a of the T groove 8.

FIG. 10 shows a third modification, and FIG.
Is different from FIG. 2 in the following point.
That is, by pressing the stopper member 86 against the bottom surface of the T leg 9, the hydraulic clamp 3 is prevented from erroneously moving forward.

The above embodiments and modifications can be further modified as follows. The clamp 3 may be a pneumatic clamp instead of a hydraulic clamp, or may be an electric screw clamp. The fluid pressure type stop means 85 may be a double action type instead of a single action type, and may be a pneumatic type instead of a hydraulic type. In addition, the fluid pressure type stop means 85
May use a circuit different from the fluid pressure circuit of the clamp 3. Further, the stopper member 86 of the stop means 85 may be driven by another type of actuator such as a solenoid. The stopper 86
May be provided on the side of the peripheral wall 8a instead of being provided above the peripheral wall 8a of the T groove 8.

The T leg 9 may be configured to be clamped only to the receiving portion 83, instead of being clamped to both the receiving portion 83 and the peripheral wall 8a of the T groove 8. . Further, the clamp 3 is provided with
Of the slide 2 instead of being held in another T-slot 8
It is also possible to configure so as to be held in the T groove 5. The sprocket 22 is a second
Instead of engaging with the longitudinal part 32, it is also possible to engage with the first longitudinal part 31 or the U-turn part 30 described above.

The push / pull transmission may be a toothed belt, a belt-like member, a wire-like member, or the like, instead of the chain 28. When the transmission is constituted by a belt-like member or a wire-like member, a pulley is used as the pushing / pulling means instead of the sprocket 22. As an actuator for driving the push / pull means, a hydraulic cylinder, an electric motor, a linear motor, or the like can be used instead of the pneumatic cylinder 16 described above. The object to be fixed by the clamp 3 may be a workpiece, a heat-treated component, or the like, instead of a mold.

[Brief description of the drawings]

FIG. 1 is a system diagram illustrating a push-pull device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the push / pull device as viewed from an elevation.

FIG. 3 is a cross-sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG.

FIG. 5 is an enlarged sectional view taken along line VV in FIG.

FIG. 6 is an enlarged schematic view of a main part in FIG. 2 described above.

FIG. 7 is an exploded perspective view of a push-pull chain provided in the push-pull device, and two adjacent link members of the chain.

FIG. 8 is a view showing a first modification of the present invention and corresponding to FIG. 6 described above.

FIG. 9 is a view showing a second modification of the present invention and corresponding to FIG.

FIG. 10 is a view showing a third modification of the present invention and corresponding to FIG. 2 described above.

[Explanation of symbols]

3 ... clamp (hydraulic clamp), 8 ... T-slot (another T-slot), 8
a: peripheral wall, 9: T leg, 9b: hole, 16: actuator
(Pneumatic cylinder), 22: rotating wheel (sprocket), 28: transmission (chain), 32: linear long part (second long part) of transmission 28, 83: receiving part (bolt), 86
... Stopper tool, M: projecting position, N: retracting position, Y: retracting position of clamp 3.

Claims (4)

[Claims] A clamp (3) having a T-leg (9) fitted into a T-groove (8), and a clamp (3) inserted into the T-groove (8) so as to be able to advance and retreat, and having the T-leg (9). ), And a transmission that engages with the transmission (28) and is
(28) A rotary wheel (22) for pushing and pulling in the longitudinal direction, and an actuator (16) for reciprocatingly rotating the rotary wheel (22).
And a receiving portion (83) provided at the start end of the T-slot (8), and the transmission (2) is rotated by the rotating wheel (22).
By pulling the T-leg (9) to the start end of the T-groove (8) through 8), the T-leg (9) is pressed against the receiving portion (83) to clamp the clamp. (3) The clamp push-pull device characterized in that it can be held at the retracted position (Y). 2. The push-pull device for a clamp according to claim 1, wherein said rotating wheel (22) is constituted by a sprocket and said transmission tool (28) is constituted by a chain, and said chain transmission is formed. A push / pull device for a clamp, characterized in that said sprocket wheel (22) is engaged with a linear longitudinal portion (32) of a tool (28). 3. A clamp push-pull device according to claim 1, wherein said T-groove (8) has a peripheral wall (8) at a start end thereof.
a) provided with a stopper member (86), and the stopper member
(86) is at the same position as the protruding position (M) which faces the T-leg (9) pressed by the receiving portion (83) and prevents the T-leg (9) from advancing. A clamp pushing / pulling device characterized in that it can be switched to a retracted position (N) allowing the advance by releasing the facing. 4. The push-pull device for a clamp according to claim 3, wherein said T-leg (9) has a hole (9b) for receiving a stopper (86) switched to said projecting position (M). Forming
A clamp pushing / pulling device characterized in that the stopper (86) can face the peripheral wall of the hole (9b).