JP2916981B2 - Swing type clamp device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp device in which a clamp rod is swung.

[0002]

2. Description of the Related Art Swing-type clamping devices of this type include:
The one shown in FIG. 6 is known. 6A shows a clamped state, FIG. 6B shows an unclamped state, and FIG.
(c) shows a swing state. This prior art is configured as follows, as shown in FIG.

[0003] A piston rod 113 is supported on the housing 107 so as to be vertically movable, and a base of a clamp rod 122 is supported on a top of the piston rod 113 by a pivot pin 128 so as to be swingable, and a cam is mounted on the base of the clamp rod 122. A groove 160 is provided, and a roller 138 is engaged with the cam groove 160 from below,
The roller 138 is supported by the housing 107.

The above-mentioned clamping device operates as follows.
6A, the lower die 102 is pressed and fixed to the upper surface of the bolster 101 by the clamp rod 122. When switching from the clamped state to the swing state shown in FIG. 6C, the piston 112 is driven upward. Then, as shown in FIG. 6B, the piston rod 113 raises the clamp rod 122 to the unclamping position Y, and the lower groove portion 161 of the cam groove 160 contacts the roller 138 from below. A downward reaction force starts to act on the lower groove portion 161 from 138. This allows the clamp rod
122 is forcibly rocked by an angle of about 45 degrees,
The swing position is switched to the swing position Z in FIG. 6C by gravity.

[0005] From the swing state of FIG.
When switching to the clamp state (a), the piston
By driving 112 downward, the clamp rod 122 is lowered by the piston rod 113. Then, the cam groove 160 presses the roller 138 downward, so that the roller
An upward reaction force acts on the cam groove 160 from 138. Thereby, the clamp rod 122 swings around the pivot pin 128 and switches to the unclamping position Y in FIG.
Subsequently, it is driven down to the clamp position X in FIG.

[0006]

The above prior art has the following problems. When the clamp rod 122 at the swing position Z is driven for clamping, the U of the lower mold 102 is
When the position of the groove 109 is shifted, an intermediate portion of the clamp rod 122 comes into contact with the lower surface corner 164 of the lower mold 102 as shown in a two-dot chain line diagram in FIG. . For this reason,
The clamp drive is performed while the clamp rod 122 is held in the inclined posture, and the cam groove 160 is
38 is pressed strongly downward diagonally, so the cam groove 160
Or, the roller 138 is damaged.

Further, when the clamp rod 122 at the unclamping position Y is driven to be switched to the swing position Z, the right side of the cam groove 160 is opened,
The angle at which the lower groove portion 161 can be forcibly operated to swing is about 45 degrees, and the further swing is performed by the gravity of the clamp rod 122. Therefore, when foreign matter is caught and mixed in the pivot pin 128 or the like, the clamp rod 122 cannot be switched to the swing position Z. In addition, since the swing operation can be performed only at an angle of about 45 degrees, it can be used for the lower clamping device, but it is difficult to use it for the upper clamping device.

A first object of the present invention is to prevent damage to a clamp device. A second object of the present invention is to make it possible to reliably switch the clamp rod to a desired swing position.

[0009]

According to the present invention, in order to achieve the above object, for example, as shown in FIG. 1 to FIG. 3 or FIG. 5, a clamping device is constituted as follows. .

A drive rod 13 is supported on the housing 7 so as to be able to advance and retreat in the axial direction, and a drive means 20 for operating the drive rod 13 is provided on the housing 7. A clamp rod 13 is attached to the tip 13 a of the drive rod 13. A swing-type clamp device in which a base 22b of the base 22 is swingably supported by a pivotal support 28 so that the clamp rod 22 can swing from a vertically unclamped position Y to a horizontally inclined swing position Z. , An elastic body A for pressing the clamp rod 22 from the swing position Z to the unclamping position Y is provided, and the base 2 of the clamp rod 22 is laterally separated from the pivotal support 28.
2b, a swing operation portion 31 is provided, and an operation portion 38 facing the operation portion 31 is laterally extended from the distal end portion 22a side of the clamp rod 22, and the operation portion 38 is connected to the housing. 7 fixed.

In the above configuration, the following (1)
It is preferable to add at least one of the configurations (3). (1) The operated part 31 for swing is constituted by a pin, and the operation part 38 is constituted by an operation surface extending in the lateral direction. (2) The elastic body A is constituted by a compression coil spring 33, and the compression coil spring 33 is
2 between the base 22b and the housing 7. (3) A structure in which one end of the compression coil spring 33 is received by the swing operated portion 31 and the other end of the spring 33 is received by the housing 7.

[0012]

The present invention operates as follows, for example, as shown in FIG. In the clamped state shown in FIG.
By 0, the drive rod 13 is retracted downward, and the clamp rod 22 is driven to the clamp position X. When switching from the clamped state in FIG. 1A to the swing state in FIG. 1C, the drive rod 20 is advanced upward by the drive means 20 described above.

Then, first, as shown in FIG. 1B, the drive rod 13 switches the clamp rod 22 to the unclamping position Y, and the swing operated portion 31
Is received by the operation section 38, and a downward reaction force starts to be applied from the operation section 38 to the operated section 31. Due to the reaction force, the clamp rod 22 is moved to the pivot pin 28.
To the swing position Z. During the above-mentioned swing operation, the operated portion 31 can be kept in contact with the operating portion 38 by the elastic pressure of the elastic body A, so that a reaction force always acts on the operated portion 31 from the operating portion 38. The clamp rod 22 is forcibly operated to swing over the entire range of the swing operation by the above-mentioned reaction force, so that it is reliably switched to the swing position Z.

From the above-mentioned swinging state of FIG.
When switching to the clamped state shown in FIG.
As a result, the drive rod 13 is retracted downward. Then, the clamp rod 22 is first swung about the pivot pin 28 as shown by a two-dot chain line diagram in FIG. It is swung to the clamp position Y. Thereafter, the clamp rod 22 is driven down to the clamp position X in FIG.

If the carrying position of the fixed object 2 such as a lower mold is shifted during the clamp driving, the driving means 2
In FIG. 1, the clamp rod 22 is clamped downward while the clamp rod 22 remains inclined as shown by the two-dot chain line in FIG. As a result, the swing operated portion 31 is also driven down, but since the operated portion 31 only compresses the elastic body A, the components of the device are not damaged.

[0016]

The present invention has the following effects because it is constructed and operates as described above. At the time of the clamp drive, even if the clamp rod is driven in the inclined posture while being clamped, the operated member for swing only compresses the elastic body, so that the constituent members of the clamp device are not damaged. Furthermore, during the swing operation, the operated portion can be brought into contact with the operation portion by the elastic pressure of the elastic body, so that a reaction force always acts from the operation portion to the operated portion. Since the clamp rod can be forcibly operated to swing over the entire swing operation range by the reaction force, it is possible to reliably switch the clamp rod to the swing position.

When the following configuration is added to the above-described configuration, the following effects are further obtained. (1) The operated part for swing is constituted by a pin,
When the operating section is constituted by an operating surface extending in the lateral direction, the operated section and the operating section can both be formed in a simple shape, so that the swing operation can be performed smoothly and reliably, and the manufacturing cost of the clamp device is increased. Is cheaper. (2) The elastic body is constituted by a compression coil spring,
When the compression coil spring is mounted between the base of the clamp rod and the housing, the range of expansion and contraction of the elastic body is widened, so that the swing angle can be increased. (3) When the end of the compression coil spring is received by the operated part for swing, the operated part can also serve as the receiving part of the spring, so that the configuration of the device is simplified.

[0018]

【Example】

(First Embodiment) FIGS. 1 to 3 show a first embodiment.
First, according to the longitudinal front view of FIG. 2 and the right side view of FIG.
The configuration of the clamp device will be described.

A lower die 2 is placed on the upper surface of a bolster 1 of a press machine, and the lower die 2 is pressed and fixed to the upper surface of the bolster 1 by a clamp 3. A plurality of bolts (not shown) are provided on the stepped portion 6 of the recess 5 formed in the bolster 1.
By this, the housing 7 is fixed. The lower die 2 is formed with a U-shaped groove 9 in plan view.

Cylinder hole 1 formed in housing 7
1, a piston 12 is inserted to be able to move hermetically in a vertical direction. A drive rod 13 is provided on the upper wall 11a of the cylinder hole 11.
Is supported to be able to advance and retreat in the axial direction (here, vertical direction),
The lower part of the drive rod 13 is fixed to the piston 12. A hydraulic pressure chamber 15 for clamping is formed between the upper wall 11a of the cylinder hole 11 and the piston 12, and a pneumatic pressure for swing is provided between the end plate 11b and the piston 12 which constitute the lower wall of the cylinder hole 11. A chamber 16 is formed. Reference numeral 17 denotes a pressure oil supply / discharge port, and reference numeral 18 denotes a compressed air supply / discharge port. A driving means 2 for moving the driving rod 13 forward and backward by the piston 12, the clamping hydraulic chamber 15, and the swing pneumatic chamber 16.
0 is configured.

The base 22b of the clamp rod 22 is swingably supported by the distal end 13a of the drive rod 13. That is, an inverted U-shaped groove 23 is formed in the base portion 22b of the clamp rod as viewed from the right side, and the groove 23 is fitted to the distal end portion 13a of the drive rod 13 above. further,
A plate 26 is fixed to a base 22 b of the clamp rod 22 by a bolt 24 and two roll pins 25. The distal end 13a of the drive rod 13, the base 22b of the clamp rod 22, and the plate 26
The stepped pivot pin 28 is inserted, and the pivot pin 28 is prevented from coming off by the retaining ring 29. The clamp 3
Is fixed to the tip portion 22a of the clamp rod 22. A swing-regulating stopper 30 protrudes from the base 22b of the clamp rod 22.

At a position laterally away from the pivot pin 28, the plate 26 supports a swing operated portion 31 composed of a pin. An elastic body A including a compression coil spring 33 is provided between the operated portion 31 and the housing 7. That is, a spring housing hole 34 is formed in the housing 7, and the lower end of the compression coil spring 33 is received on the bottom wall of the hole 34. The upper end of the compression coil spring 33 is received by the peripheral surface of the operated portion 31 via a spring holder 35. The spring receiver 35 is movable within a predetermined range in a direction perpendicular to the paper surface of FIG.

Further, an inverted L-shaped block 37 is fixed to the upper surface of the housing 7 by a plurality of bolts (not shown). A swing operation section 38 provided on the upper left portion of the block 37 faces the operated section 31 from above. The operation section 38 is constituted by an operation surface extending in the lateral direction. The block 37 supports a proximity switch 40 for detecting a clamp state and a proximity switch 41 for detecting a swing state. These proximity switches 40
In accordance with 41, a detected part 43 in a clamped state and a detected part 44 in a swing state are provided on the plate 26.

The operation of the clamp device will be described with reference to FIG. FIG. 1A shows a clamped state, FIG. 1B shows an unclamped state, and FIG. 1C shows a swing state. In the clamp state of FIG. 1A, compressed air is discharged from the swing pneumatic chamber 16 and pressurized oil is supplied to the clamp hydraulic chamber 15. As a result, the piston 12 is driven downward, the drive rod 13 drives the clamp rod 22 to the clamp position X, and the clamp 3 presses the lower mold 2.

From the clamped state of FIG.
At the time of switching to the swing state of (c), the hydraulic oil is discharged from the clamping hydraulic chamber 15 and the compressed air is supplied to the swing pneumatic chamber 16 to drive the piston 12 upward. Then, first, as shown in FIG.
The driving rod 13 drives the clamp rod 22 upward to the unclamping position Y, the clamp 3 is separated from the lower mold 2 and the operated part 31 is moved to the operating part 38.
It is accepted. Accordingly, a reaction force starts to be applied from the operation unit 38 to the operated unit 31.

By the above reaction force, the clamp rod 22 is swung about the pivot pin 28 and switched to the swing position Z as shown in FIG. 1 (c). During the above-mentioned swing operation, the above-mentioned operated portion 31 can be brought into contact with the operating portion 38 by the elastic force of the compression coil spring 33, so that a reaction force always acts on the operated portion 31 from the operating portion 38. The clamp rod 22 is forcibly operated to swing over the entire range of the swing operation by the above-mentioned reaction force, so that it is reliably switched to the swing position Z.

From the above-mentioned swing state of FIG.
When switching to the clamping state of (a), the clamping device operates in the reverse order. That is, FIG.
When the compressed air is discharged from the swing pneumatic chamber 16 and the pressurized oil is supplied to the clamping hydraulic chamber 15 in the swinging state, the piston 12 drives the clamp rod 22 downward through the drive rod 13. . Thereby, the clamp rod 22 is connected to the compression coil spring 33.
First, as shown in a two-dot chain line diagram in FIG. 3, the rocker is pivoted about the pivot pin 28 and then to the unclamping position Y in FIG. 1B. Thereafter, the clamp rod 22 is driven down to the clamp position X in FIG.

If the position of the U-shaped groove 9 is deviated from the correct position due to the carry-in error of the lower mold 2 during the clamp driving, the clamp rod 22 is moved to the position shown in FIG.
The lower mold 2 is brought into contact with the lower surface corner 2a in the position shown by the two-dot chain line, and is clamped downward while keeping its inclined position. As a result, the operated portion 31 is also lowered downward, and the operated portion 31
Is not compressed, so that the components of the device are not damaged.

The upper end of the compression coil spring 33 may be received directly by the base portion 22b of the clamp rod 22 instead of being received by the operated portion 31 described above.

FIG. 4 shows a modification of the block 37. In this case, the upper portion of the block 37 is formed in an inverted U-shape, and the swing operating portion 38 extending in the lateral direction and the straight traveling guide portion 51 extending in the vertical direction are provided in a row.

(Second Embodiment) FIG. 5 is a vertical sectional front view of a clamp device according to a second embodiment. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and described. The driving means 20 is constituted by a single-acting spring return type hydraulic cylinder. That is, the clamping hydraulic chamber 15 is formed above the piston 12, and the lifting spring 55 is mounted below the piston 12 and the driving rod 13. The elastic body A is constituted by a torsion spring 56. One end of the torsion spring 56 is connected to the distal end portion 13a of the drive rod 13, and the other end of the torsion coil spring 56 is connected to the base 22b of the clamp rod 22.
Reference numeral 31 denotes the swing operated portion. Reference numeral 38 denotes the above-described operation unit, which is provided in the block 37.

Each of the above embodiments can be modified as follows. The drive means 20 may be of a type that performs a clamp drive by pneumatic pressure, and may be one that moves the drive rod forward and backward by screwing in place of the hydraulic cylinder. The elastic body A may be made of urethane rubber or the like instead of the spring.

The pivot pin 28 is preferably formed in a cylindrical shape, but may be formed in a pipe shape. The swing operated portion 31 may be a sphere instead of a pin. The swing angle of the clamp rod 22 may be set in a range in which the lower mold 2 does not interfere with the clamp rod 22 when the clamp rod 22 is carried out and carried in the lateral direction. Therefore, the swing angle can be made larger or smaller than 90 degrees. The clamp device may be one that presses and fixes the upper die, and can be mounted not only on a press machine but also on other types of machines.

[Brief description of the drawings]

FIGS. 1A and 1B are explanatory views of the operation of a clamp device according to a first embodiment of the present invention. FIG. 1A shows a clamped state, FIG. 1B shows an unclamped state, and FIG. The state is shown.

FIG. 2 is a vertical sectional front view of the clamp device.

FIG. 3 is a right side view of FIG. 2 described above.

FIG. 4 is a view showing a modification of a swing operation unit provided in the clamp device.

FIG. 5 shows a second embodiment of the present invention and is a view corresponding to FIG. 2 described above.

FIG. 6 is a diagram showing a conventional example and corresponding to FIG. 1 described above.

[Explanation of symbols]

7 housing, 13 drive rod, 13a tip
Reference Signs List 20: driving means, 22: clamp rod, 22a: distal end, 22b: base, 28: pivot support (pivot pin), 31: operated part for swing, 38: operation part, A: elastic body (compression coil spring) 33, torsion spring 56), Y: unclamping position, Z: swing position.

Claims (1)

(57) [Claims] A drive rod (13) is supported by a housing (7) so as to be able to advance and retreat in the axial direction, and a drive means (20) for operating the drive rod (13) is provided in the housing (7). The base (22b) of the clamp rod (22) is swingably supported by the pivotal support (28) on the tip (13a) of the drive rod (13), and the clamp rod (22) is vertically oriented. In a swing type clamp device configured to be able to swing from an unclamping position (Y) to a swinging position (Z) inclined in a lateral direction, the clamp rod (22) is moved from the swinging position (Z) to the unclamping position (Y ) Is provided on the base (22b) of the clamp rod (22) at a position laterally separated from the pivotal support (28).
(31), and an operating portion (38) facing the operated portion (31) extends laterally from the tip (22a) side of the clamp rod (22), and the operating portion ( (38) is fixed to the housing (7).