JPH10180370A - Pushing/pulling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make compact and light in weight by saving idlers and freely turnable means of supporting the idlers in a way capable of pushing/pulling transmission parts through a second wheel by reciprocatively rotating a first wheel through driving member. SOLUTION: In this device, a block 7 is fixed to a slide 2 of a press machine 1, to which block 7 is fixed a lower part of air pressure cylinder 16 and a lower part of casing 24. On an upper part of piston rod 19 of the cylinder 16, a pinion 21 formed in one body and a sprocket 22 are supported freely rotatably. A rack 26 which rotates the pinion 21 is fixed to the casing 24. A chain 28 pushed or pulled by the sprocket 22 is composed of a base end 29 connected to an end plate 16a of the cylinder 16, an upward stretching first longitudinal part 31, a U-turn part 30, a downward stretching second longitudinal part 32, and a top end 34 connected to a hydraulic clamp 3. The sprocket 22 is engaged with the longitudinal part 32. With the expansion or contraction of the cylinder 16, the clamp 3 is shifted either to advancing position X or retreating position Y.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a device for pushing and pulling a hydraulic clamp or the like.

[0002]

2. Description of the Related Art A push / pull device of this type has been disclosed in Japanese Utility Model Publication No. 4-21612. The conventional device is configured as follows. A drive chain is looped around a drive sprocket and an idler arranged at predetermined intervals above and below. A piston rod of a pneumatic cylinder is connected to a linear portion of the driving chain, and the driving sprocket is reciprocated by the expansion and contraction of the pneumatic cylinder. The push / pull chain is configured to be able to be pushed / pulled by the push / pull sprocket connected to the driving sprocket, and the hydraulic clamp connected to the tip of the push / pull chain is reciprocated.

[0003]

The above prior art has the following problems. The push-pull device has many components because it is necessary to provide an idler and a means for rotatably supporting the idler. Further, since the above-mentioned drive chain is formed in a loop shape, it is difficult to effectively use the space surrounded by the chain, and the chain is long and its own weight is large. Therefore, the push-pull device occupies a large space and is heavy. An object of the present invention is to make a push-pull device compact and lightweight.

[0004]

In order to achieve the above object, according to the present invention, for example, as shown in FIGS. 1 to 6, a push-pull device is constituted as follows. A first wheel 21 that is reciprocated by the reciprocating means 16 and a driving member 26 that engages with the first wheel 21 to rotate the first wheel 21;
A second wheel 22 rotated by the first wheel 21 and a flexible transmission 28 pushed and pulled by the second wheel 22 are provided, and the transmission 28 is connected to the fixed member 7. A base end 29, a first longitudinal portion 31 extending in the direction of the above-described linear movement, a second longitudinal portion 32 extending in the direction of the linear movement as in the U-turn portion 30, and a distal end 34 connected to the transferred object 3. Are provided in order, and the second longitudinal portion 32
And the above-mentioned second wheel 22 is engaged.

The reciprocating means 16 includes a fluid pressure cylinder such as a pneumatic cylinder or a hydraulic cylinder, an electric motor,
A linear motor or the like is conceivable. The combination of the driving member 26 and the first wheel 21 is preferably a combination of a rack and a pinion, but may be a combination of a chain and a sprocket, and may be a friction transmission composed of a belt-shaped member (or a wire-shaped member) and a pulley. It may be a mechanism. The combination of the transmission 28 and the second wheel 22 is preferably a combination of a chain and a sprocket, but may be a friction transmission mechanism including a belt-shaped member (or a wire-shaped member) and a pulley. As the above-mentioned transferred object 3, a fluid pressure clamp, a mold, a work, or the like can be considered.

[0006]

The present invention operates as follows, for example, as shown in FIG. When the hydraulic clamp 3 to be transferred is transferred from the retreat position Y in the solid line diagram to the advance position X in the two-dot chain line diagram, the first wheel 21 is moved along the drive member 26 by the advance / retreat means 16. When lowered, the first wheel 21 is rotated clockwise by the driving member 26. As a result, the first wheel 21 becomes the second wheel 22
Is rotated clockwise, and the second wheel 22 pushes down the second longitudinal portion 32 of the transmission 28, so that the tip 34 of the transmission 28 moves the clamp 3 to the advanced position X.

On the contrary, when the clamp 3 is transported from the advance position X to the retreat position Y, the first wheel 21 is raised by the advance / retreat means 16.
The first wheel 21 is rotated in the counterclockwise direction by the driving member 26. As a result, the first wheel 21 becomes the second wheel 22
Is rotated in the counterclockwise direction, and the second wheel 22 pushes up the second longitudinal portion 32, so that the clamp 3 is moved to the retracted position Y.

As described above, the second longitudinal portion 32 of the transmission 28 is pushed and pulled by the second wheel 22, so that the second wheel 22 is engaged with the U-turn portion 30. In comparison with the case, the moving length L of the clamp 3, which is the object to be conveyed, is no longer limited by the length of the first longitudinal portion 31, and the moving length L can be increased.

The present invention has the following effects because it is configured and operates as described above. By reciprocating the first wheel by the driving member, the transmission can be pushed and pulled via the second wheel, so that the above-described conventional idler and the means for rotatably supporting the idler can be omitted. For this reason,
The push-pull device of the present invention can be made compact and lightweight because the number of constituent members is small and the occupied space is small because the idler and the support means are omitted.

Further, according to the present invention, the driving chain of the above-mentioned conventional example can be omitted, so that the loop-shaped space surrounded by the driving chain can be effectively used as the installation space for the components of the push-pull device. And the weight of the chain is also eliminated. Therefore, also from this point, the push-pull device can be made compact and lightweight. In addition, the omission of the drive chain eliminates an error due to expansion and contraction of the chain, thereby improving the accuracy of pushing and pulling the transferred object. Further, since the second longitudinal portion of the transmission is pushed and pulled by the second wheel, the moving length of the conveyed object such as the clamp is not limited by the length of the first longitudinal portion, and the moving length is large. Length can be secured.

It is to be noted that, as set forth in claim 2, the first
When the wheel is constituted by a pinion and the second wheel is constituted by a sprocket, and the diameter of the pitch circle of the sprocket is set to a value larger than the diameter of the pitch circle of the pinion, the ratio of these diameters , The rotation speed of the sprocket can be increased, so that the forward / backward stroke of the forward / backward means can be reduced to make the push / pull device more compact.

According to a third aspect of the present invention, a shaft is provided at an output portion of the reciprocating means, and the first and second wheels are rotatably supported on the shaft and the rolling member is rotated. When the rolling member is freely supported and the rolling member is fitted between a pair of guide rails extending in the direction of the linear movement, the shaft, the first wheel and the second wheel are interposed via the rolling member. And can be guided straight in the straight traveling direction. For this reason, it is possible to maintain the engagement between the first wheel and the driving member and the engagement between the second wheel and the transmission in a suitable state, and to prevent the advancing and retreating means from moving. The output can be efficiently transmitted to the transmission.

Further, the advancing / retracting means is constituted by a double-acting pneumatic cylinder, and a piston rod which is an output part of the pneumatic cylinder is connected to the first wheel, and the piston Brake means for preventing the rod from moving forward and backward are provided, and the brake means is released when compressed air is supplied to one of the two working chambers of the pneumatic cylinder. In the case where the switching to the brake state is performed when the compressed air is discharged from both of the two working chambers, it is possible to perform the inching operation on the conveyed object. The transferred object can be stopped at a desired position.

[0014]

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 of a hydraulic source P such as an air hydraulic booster is supplied to a hydraulic working chamber 14 formed above the piston 12 via a two-position switching valve 13, the hydraulic pressure of the cylinder body causes the T-leg 9 to move with respect to the cylinder body. The cylinder body 11 presses the upper die 4 against the lower surface 2 a of the slide 2. Conversely, the pressure oil in the working chamber 14 is transferred to the switching valve 13.
, The cylinder body 11 is lowered by the spring 15 to release the pressed state. 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 (output portion) 19 projects upward from a piston 18 inserted into the cylinder tube 17.

A pair of pinions (first wheels) 21 are rotatably supported above the piston rod 19, and a pair of racks (drive members) 26 are vertically mounted on a casing 24 of the push-pull device 6. Each rack 26 is engaged with each of the pinions 21 to rotate the same. Pinion 21 ・ 21
, A pair of sprockets (second 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, and here, the value of D / d is set to about 2.0. 1 and 2, the pair of pinions 21 and 21, the sprockets 22 and 22, and the racks 26
6 and one each.

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. The base end 29 of the chain 28 is connected via the cylinder tube 17 to the mounting block 7 which is a fixed member. The first longitudinal portion 31 and the second longitudinal portion 32 are guided by a first guide 41 and a second guide 42 so as to be able to be pushed and pulled in the vertical direction, respectively, and the sprocket 22 is mounted on the second longitudinal portion 32. Engaged. The third longitudinal portion 33 is guided by the T-grooves 5.8 so as to be able to be pushed and pulled in the left-right direction.

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, when 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 to supply compressed air to one of the working chambers 37 and 38, the compression valve 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 is output. When the clamp 3 is advanced by the cylinder 16, the contact 58 of the mold detection limit switch 58 is turned off.
a detects the flange 4a of the upper die 4 and outputs a detection signal. Further, when the clamp 3 is driven to advance by mistake when the upper die 4 is not loaded into the lower side of the slide 2 or when the loaded upper die 4 is abnormally small, the cylinder 16 exceeds the set amount. Since the contraction occurs, the abnormal advance detection limit switch 59 detects the contraction, and a detection signal is output.

The specific structure of the above-described push-pull device 6 is as follows.
3 to 5 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.

As shown mainly in FIGS. 2 and 3, the mold detection 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 stop 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 by using the stop 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.

Also, as shown in FIG.
Is prevented from moving rightward beyond the retreat position Y by the bolt 83 fixed to the top wall of the another T groove 8. Further, means 85 for locking the clamp 3 at the retracted position Y is provided on the mounting block 7. The locking means 85 includes a pressing rod 86 inserted into the block 7 in an oil-tight manner so as to be vertically movable, and the rod 86
A lock operating chamber 88 provided between the cover bolt 87 and
A spring 89 for raising and returning the rod 86 is provided, and a spring receiver 90 provided above the rod 86 is provided. The lock operation chamber 88 communicates with the oil supply / discharge passage 65 described above.

When the hydraulic clamp 3 is operated at the retracted position Y, the rod 86 is supplied by the pressure oil supplied from the oil supply / discharge passage 65 to the lock operation chamber 88.
Moves into another T-groove 8, and the rod 88 pushes the bottom surface 9 a of the T-leg 9 of the clamp 3 downward, thereby pressing and fixing the T-leg 9 to the peripheral wall of the another T-groove 8. . For this reason, even during the operation of the press machine 1, it is possible to prevent the clamp 3 that is waiting at the retreat position Y from vibrating due to the impact from the slide 2. On the other hand, when the clamp 3 is released when the clamp 3 at the retracted position Y is moved to the advanced position X, the pressure oil is also discharged from the lock operation chamber 88. As a result, the rod 86 is raised by the spring 89 to release the pressed and fixed state of the T-leg 9, so that the clamp 3 is allowed to move.

The detailed structure of the push-pull chain (transmission tool) 28 near the center in the longitudinal direction (that is, the first longitudinal portion 31, the U-turn portion 30, and the second longitudinal portion 32) is mainly shown in FIG. It will be explained by. FIG. 6 is an exploded perspective view of two adjacent link members 91 and 92 of the chain 28. These adjacent link members 91.9
One of the link members 91 is formed in a substantially U-shape, and includes a left side wall 91a, a right side wall 91b, and a bottom wall 91c.
And The other link member 92 is formed in a substantially inverted U-shape, and has a left side wall 92a and a right side wall 92a.
b and a top wall 92c.

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 connecting the two link members 91 and 92, 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 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 in the longitudinal direction of the chain 28.
In the longitudinal portion 33, the other two link members 92 are connected together and the one connecting member 91 is connected two.
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 arranged substantially identical to the longitudinal axis of the chain 28, the width of the casing 24 of the push-pull device 6 is reduced. For this reason, the push-pull device 6 can be installed adjacently at a small pitch. In addition, since two sets of the rack 26 and the pinion 21 are arranged on both sides of the piston rod 19, the pinion 21 can rotate smoothly without any eccentric load. Further, by changing the diameter d of the pitch circle of the pinion 21, the speed increase ratio and the push-pull force can be easily changed. For this reason, in the push / pull devices having different push / pull capabilities, only the rack 26 and the pinion 21 need to be changed, and other components can be shared, so that the manufacturing cost can be significantly reduced.

Since the sprocket 22 is rotated by the combination of the rack 26 and the pinion 21, the sprocket 22 can be rotated reliably and efficiently, and the positioning accuracy of the hydraulic clamp 3 is improved.

The rolling member 79 is provided between the guide rail 80 and another guide rail 26a provided on the rack 26.
Is inserted into the pinion 2 provided on the sleeve 76.
1 and the sprocket 22 can be moved straight up and down. For this reason, it is possible to prevent the tip of the pinion 21 from biting into the tip of the rack 26 and to prevent the sprocket 22 from being pressed more than necessary to the chain 28. As a result, the rotational resistance of the pinion 21 and the sprocket 22 is reduced, and the output of the pneumatic cylinder 16 can be effectively transmitted to the chain 28.

The pneumatic cylinder 16 is configured to be double-acting, and the extension pressure port 52 and contraction pressure port 53 are selectively connected to the pneumatic working chamber 55c of the brake means 55. Therefore, by switching the three-position switching valve 46, the chain 28 can be pushed and pulled by an inching operation, and the positioning accuracy of the hydraulic clamp 3 is improved. In addition, since the piston rod 19 can be automatically braked by the urging force of the brake spring 55g, even if the compressed air is lost or reduced, the clamp 3 is prevented from moving halfway. it can.

FIG. 7 shows another embodiment of the present invention, and is a view corresponding to FIG. 3 described above. In this alternative embodiment, the same reference numerals are given to members having the same configuration as the above embodiment.

In this embodiment, the cylinder tube 17 of the pneumatic cylinder 16 serving as the reciprocating means is connected to the casing 2.
4 fixed to the upper half. The lower part of the piston rod 19 protruding downward from the cylinder tube 17 is connected to the shaft 73. A sleeve 76 rotatably fitted on the shaft 73 is integrally formed, and a pair of sprockets 22 is provided at the center in the axial direction.
22 and a pair of pinions 21.2 at both ends
1 is provided. The guide rails 80 for guiding the rolling members 79 are disposed forward and backward outside the rack 26 (only one of the front sides is shown here). It is also possible to provide the rolling member 79 between the pinion 21 and the sprocket 22 and arrange the guide rail 80 at a position corresponding to the rolling member 79.

Each of the above embodiments can be further modified as follows. The pinion 21 and the sprocket 22 may be formed integrally or separately. Instead of providing two pinions 21 and two sprockets 22, only one pinion 21 and one sprocket 22 may be provided. The diameter D of the pitch circle of the sprocket 22 is the pinion 2
It is preferable that the diameter is larger than the diameter d of the pitch circle of 1.
There is no problem even if the value is smaller than the diameter d.

The brake means 55 includes a hydraulic clamp 3
It is only necessary to release the holding and fixing state of the piston rod 19 when the piston rod 19 is moved. Instead of using the above-described single-acting cylinder, a double-acting cylinder may be used. May be used. When it is not necessary to perform the inching operation on the transferred object such as the hydraulic clamp 3, the brake unit 55 may be omitted.

The transferred object to be pushed and pulled may be a mold or a work instead of the hydraulic clamp 3. The guide path into which the transferred object and the chain (transmission tool) 28 are inserted may be a guide rail or the like instead of the T-groove 5 described above. The flexible long member housed in the chain 28 may be a pneumatic hose, a welding wire, a packing belt, or the like, in addition to the hydraulic hose 62 and the electric cable 68. The transmission for pushing and pulling the transferred object may be a belt-shaped member or a wire-shaped member instead of the chain 28.

[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 above-described device when 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 shows a push-pull chain provided in the above device,
FIG. 3 is an exploded perspective view of two adjacent link members of the chain.

FIG. 7 is a view showing another embodiment of the present invention and corresponding to FIG. 3 described above.

[Explanation of symbols]

3 ... Conveyed object (hydraulic clamp), 7 ... Fixed side member (mounting block), 16 ... Advancing / retracting means (pneumatic cylinder), 19 ... Piston rod (output unit), 21 ... First wheel (pinion), 22
… Second wheel (sprocket), 26… drive member (rack), 2
6a: guide rail, 28: transmission (chain), 29:
Base end, 30 ... U-turn part, 31 ... First longitudinal part, 32
... the second longitudinal portion, 34 ... the tip, 37/38 ... the working chamber of the pneumatic cylinder 16, 55 ... the brake means, 73 ... the shaft, 79 ... the rolling member, 80 ... the guide rail, D ... the pitch circle of the sprocket 22 Diameter, d: The diameter of the pitch circle of the pinion 21.

Claims (4)

[Claims] 1. A first wheel (21) reciprocated by an advancing / retreating means (16), and a driving member (22) engaged with the first wheel (21) to rotate the first wheel (21). 26), a second wheel (22) rotated by the first wheel (21), and a flexible transmission that is pushed and pulled by the second wheel (22).
(28), and the transmission (28) is fixed to the fixed side member (7).
A first longitudinal portion (31) extending in the direction of the above-mentioned linear movement, a U-turn portion (30), and a second longitudinal portion (32) extending in the direction of the above-mentioned linear movement; Conveyed goods
(3) and a tip (34) connected thereto in that order, and the second wheel (22) is engaged with the second longitudinal portion (32). Push-pull device. 2. The push-pull device according to claim 1, wherein the first wheel is constituted by a pinion (21) and the second wheel is constituted by a sprocket (22);
A push-pull device wherein 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). 3. The push-pull device according to claim 1, wherein a shaft (73) is provided at an output portion (19) of the advance / retreat means (16).
The shaft (73) rotatably supports the first wheel (21) and the second wheel (22) on the shaft (73) and includes a rolling member.
(79) is rotatably supported, and its rolling member (79) is
A pair of guide rails (2
6a) A push-pull device characterized by being fitted between (80). 4. The push-pull device according to claim 1, wherein said advance / retreat means is constituted by a double-acting pneumatic cylinder (16), and an output section of said pneumatic cylinder (16). Is connected to the first wheel (2).
1) a brake means (55) for preventing the piston rod (19) from moving forward and backward;
(55) are two working chambers of the pneumatic cylinder (16).
While the brake state is released when the compressed air is supplied to one of (37) and (38), the compressed air is discharged from both of the two working chambers (37) and (38). A push-pull device configured to be able to switch to a brake state when the vehicle is turned on.