JP2602493Y2 - Compact clamping 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 lightweight and compact clamp device, and more particularly to a compact clamp device which does not hinder the loading and unloading of a workpiece.

[0002]

2. Description of the Related Art There are various types of work clamping devices. In general, a work clamping device can be engaged with a work after the work is loaded and positioned at a predetermined position to clamp and hold the work, and can be moved to a position separated from the work after processing before the work is unloaded. There are many structures. For this reason, the conventional work clamping apparatus includes a first driving source (cylinder 19 in FIG. 1) for moving the entire apparatus in the direction of approaching or separating from the work, and a work clamping tool to operate the work clamping tool. At least a second drive source is required. Since the first drive source needs to be mounted on the stationary side of the machine,
Of course, a connecting mechanism for connecting the drive source and the work clamping device is required.

[0003]

As described above, in the case of a conventional work clamping apparatus, the first drive source and the coupling mechanism are required, so that the overall structure of the apparatus is increased in size and wide. Installation space is required. However,
In some cases, it is not possible to provide a wide space for the work clamping device, and it is necessary to make the work clamping device and the like as small as possible due to the demand for space saving of the machine. In addition, it is also required to quickly drive the work clamping device in synchronization with the work loading / unloading operation from the viewpoint of improving productivity.

The present invention has been made based on the above-mentioned demands, and has as its object to provide a compact clamp device which is small, compact, and responsive.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a case body having a sliding chamber, a cylinder fixed to the rear end side, and a slidable predetermined stroke. A sliding block which is supported in the sliding chamber and forms a guide chamber therein, and a lever-like member which is pivotally supported at an intermediate portion by a pin fixed to the sliding block, and a front end of which is in contact with the workpiece. A clamp portion which is in contact with and engages with a clamp rod pivotally supporting a guide roller at a rear end side; and a pressure contact member which is slidably supported in the guide chamber and is connected to the cylinder and detachably attached to and detachable from the guide roller. A clamp lock member having a wedge surface that fits therein, and a direction in which the clamp lock member housed in the guide chamber is pressed toward the rear end surface of the guide chamber to release the engagement between the wedge surface and the guide roller. Energized The predetermined stroke is formed at least from a length capable of moving the clamp portion to a position that does not interfere with the work to be carried in and out, and the inclination direction of the wedge surface is The wedge surface is formed in a direction in which the wedge surface is pressed against and engaged with the guide roller to move the clamp portion in the unclamping direction of the work, and the clamping force is rotated by a lever mechanism of a clamp rod that rotates around the pin. It features a compact clamping device that is configured to be enlarged.

[0006]

In a state where the cylinder is not operated, the clamp lock member is pressed by the spring toward the rear end face of the sliding block, and the engagement between the wedge surface and the guide roller of the clamp rod is released. Therefore, the clamp portion of the clamp rod separates from the work and is held in the unclamped state. When clamping the work, first, the cylinder is operated to move the slide block to the work side via the clamp block member and the spring. Since the clamp rod is connected to the slide block via a pin, the clamp moves to a position where the work can be pressed. When the cylinder is further operated in this state, the clamp lock member advances against the spring force, moves away from the rear end surface of the slide block, and the wedge surface is pressed into engagement with the guide roller. Therefore, the clamp rod rotates around the pin, and moves the clamp portion to the work side. Thereby, the work is clamped and locked by the wedge action of the wedge surface. At the time of unlocking, first, when the operating force of the cylinder is released, the spring overcomes the wedge force of the wedge surface, presses the clamp lock member toward the rear end surface side of the sliding block, and releases the engagement between the wedge surface and the guide roller. . In this state, when the cylinder is operated in the retreating direction, the slide block is moved to the rear end, and the clamp rod connected to the pin is retracted by a predetermined stroke. Thus, the workpiece is unlocked and carried out without interfering with the clamp rod. Less than,
The work is locked and unlocked by repeating the same operation.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an axial sectional view showing the entire structure of the present embodiment, FIGS. 2, 3 and 4 are drawings for explaining the detailed structure of each part in FIG. 1, and FIGS. It is a drawing for explaining an operation.

As shown in FIG. 1, a compact type clamp apparatus 1 is roughly divided into a case body 2, a cylinder 3, a slide block 4, and a clamp rod 5 supported by a pin 11.
And a wedge surface 9 of the clamp lock member 6 presses and engages with the guide roller 8 of the clamp rod 5 to apply a clamping force to the work 10 and lock the work 10. I do.

As shown in FIGS. 2 and 3, the case body 2 is surrounded by a front plate 12, a rear plate 13 and a frame 14, and has a box 16 defining a cylindrical sliding chamber 15 therein. It is formed from a gantry 18 on which the box body 16 is mounted and is mounted on the immovable side 17. Although a cylinder 19 is connected to the gantry 18 by a two-dot chain line in FIG. 1, this cylinder 19 corresponds to the first drive source in the description of the prior art and is unnecessary in this embodiment. The rubber member 2 is provided on the front plate 12.
0 and a support pin 21 are provided to hold a clamp rod 5 described later. The frame 14 has a lubricating oil supply pipe 2.
2 are connected, and the supply hole 23 communicates with the sliding chamber 15.

The cylinder 3 is fixed to the rear plate 13 of the case body 2, and its piston rod 35 is arranged to protrude into the sliding chamber 15. The cylinder 3 communicates with a working medium supply source (not shown).

As shown in FIGS. 1 and 3, the sliding block 4 is formed of a cylindrical member slidably supported in a sliding chamber 15 of the case body 2, and has a guide chamber 24 formed therein. . The front and rear sides of the guide chamber 24 are limited by a rear end face 25 and a stepped surface 26 on the front side.
7, 28 are formed through. The front side through-hole 28
Are bored opposite to the through holes 29 of the front plate 12 of the case body 2. The lubricating oil supply hole 23 of the case body 2
Communicates with the inside of the guide chamber 24 through the supply hole 30. As shown in FIG. 1, the sliding block 4 is attached to the front plate 12 of the case body 2.
Is formed such that the rear end face 25 of the slide block 4 and the rear face plate 13 of the case body 2 are separated by a distance a. The distance a corresponds to a predetermined stroke for preventing interference with the work 10 when the work 10 is carried in and out. As shown in FIG.
Are fixed perpendicular to the sliding direction. The lubricating oil supply hole 31 communicates with the pin 11.

As shown in FIG. 1, the clamp rod 5 is formed of a lever-shaped member, and an intermediate portion thereof is pivotally supported by a pin 11 (FIG. 3). As shown also in FIG.
A clamp portion 32 for clamping 0 is formed, and a guide roller 8 is pivotally supported on the rear end side. In other words, as shown in FIG.
The guide roller 8 is supported by the support pin 33 via the bush 34. Further, the front side of the clamp rod 5 from the support point of the pin 11 passes through the through holes 28 and 29 and is exposed (projects) to the work 10 side, and the rear side of the pin 11 is inside the guide chamber 24 of the sliding block 4. And inserted. In addition, the rubber member 20 and the support pin 21 are in contact with and supported by the outer periphery of the clamp rod 5 and prevent entry of dust and the like into the guide chamber 24.

As shown in FIGS. 1 and 4, the clamp lock member 6 is formed of a cylindrical member slidably supported in a guide chamber 24 of the slide block 4. The rear end of the clamp lock member 6 is a piston rod of the cylinder 3. 35. Further, a wedge surface 9 and a relief hole 36 (FIG. 4) are formed in the front end side. The boss 37 on the rear end side is slidably supported on the rear end side 25. The wedge surface 9 is formed of an inclined surface formed by slitting the front surface side of the cylindrical portion of the clamp lock member 6, and the inclination direction thereof is as shown in FIG.
Is formed to be inclined downward toward the pin 11 side. The escape hole 36 is formed in a size that does not interfere with the rotation of the clamp rod 5. The wedge surface 9 has a shape capable of sandwiching the outer periphery of the guide roller 8 of the clamp rod 5 between its upper and lower surfaces, and the wedge surface 9 and the guide roller 8 are brought into contact with each other as shown in FIG. The distance between the rear surface 38 of the clamp lock member 6 and the rear end surface 25 of the sliding block 4 is δ.
Is formed.

The spring 7 includes a sliding block 4 as shown in FIG.
Is provided between the stepped surface 26 in the guide chamber 24 and the front surface 39 of the clamp lock member 6 to urge the clamp lock member 6 toward the rear end surface 25 of the slide block 4. In addition,
The spring force of the spring 7 is weaker than the cylinder force of the cylinder 3 but is stronger than the wedge lock force of the wedge surface 9 of the clamp lock member 6 when the operating force of the cylinder 3 is not applied, and the clamp lock member 6 slides. Rear end face 25 of moving block
And the wedge surface 9 can be released from the wedge engagement between the guide roller 8 and the wedge surface 9.

Next, the operation of this embodiment will be described. In addition,
As shown in FIG. 1, the work 10 is put into a predetermined position by an unillustrated carrying-in / out means, is positioned and held by a work gripper 40, and is locked and unlocked by the compact clamp device 1 of the present embodiment. Shall be performed. FIG. 5 shows an initial state at the time of unlocking. When the cylinder 3 stops operating, the spring force of the spring 7 overcomes the wedge lock force between the wedge surface 9 of the clamp lock member 6 and the guide roller 8, and presses the clamp lock member 6 backward (to the right in the drawing). Release the wedge lock force. As a result, the gap δ becomes zero and the wedge lock member 6
Rear surface 38 contacts the rear end surface 25 of the sliding block 4.
As described above, the clamp rod 5 is slightly rotated in the unlocking direction about the pin 11 by the wedge surface 9 of the wedge lock member 6, and the clamp portion 32 of the clamp rod 5 is rotated.
Moves away from the work 10. Next, as shown in FIG. 6, when the cylinder 3 is operated in the unlocking direction, the clamp lock member 6 is in contact with the sliding block 4, so that the cylinder force of the cylinder 3 acts on the sliding block 4. Pin 1
1 to pull the clamp rod 5 rightward. The clamp rod 5 is pulled into the case main body 2 together with the slide block 4 in a state in which the wedge locking force is released, by an amount substantially corresponding to the distance a. Thus, the clamp portion of the clamp rod 5 is separated from the work 10. Work 10
By releasing the gripper 40 for gripping the workpiece 1,
0 can be moved in the unloading direction and unloaded and removed. Next, although not shown, by operating the cylinder 3 in the locking direction (left direction in the figure), first, the sliding block 4 advances leftward via the clamp lock member 6 and the spring 7, and It comes into contact with the front plate of the main body 2 and stops. Accordingly, the clamp rod 5 also advances, and the clamp portion 32
Is positioned at a position where it can contact the work 10. When the cylinder 3 is further operated in this state, the cylinder force hits the spring force, and only the clamp lock member 6 advances, and the wedge surface 9
Abuts on the outer periphery of the guide roller 8 and clamps the guide roller 8 between the upper and lower wedge surfaces 9, 9. Wedge surface 9, 9
Is inclined downward in the direction of the pin 11, so that the clamp rod 5 pivots the clamp 32 toward the lower side in FIG. 6 around the pin 11 and presses the clamp 32 against the work 10. Engage. Thereby, the work 10 is clamped. Hereinafter, by repeating the same operation, the clamping and unclamping of the work 10 and the advance and retreat of the clamp portion 32 are quickly and reliably performed only by the operation of the single cylinder 3.

In the present invention, the detailed structure of each component of the compact type clamping device is not limited to the above embodiment. In particular, an appropriate structure is adopted for the clamp rod 5 according to the shape of the work 10. Further, the wedge mechanism for generating the wedge force is not limited to the structure including the wedge surface 9 and the guide roller 8 in the drawing. Also, the compact clamp device 1 of the present embodiment
The cylinder 19 shown in FIG. 1 may be arranged so that the whole is largely retracted from the work 10 side during maintenance of the machine or the like.

[0017]

According to the present invention, the following remarkable effects are obtained. (1) Since the clamping and unclamping of the work and the forward and backward movement of the clamp rod are operated by a single cylinder, the entire structure is compactly assembled. (2) Since the operation is performed by a single cylinder, a quick and reliable clamping operation is performed. (3) Since the clamp rod and its wedge lock mechanism are compactly integrated in the case main body, the overall structure is reduced in size and the device space is reduced. Thus, the clamp device can be installed in a narrow space. (4) By stopping the operation of the cylinder, the clamp rod separates from the work, and the clamp rod does not move backward while the unclamping is insufficient. Wear of the contact portion with the clamp portion is prevented. (5) The clamping force of the work is generated by the wedge force generated between the wedge surface and the guide roller, and the wedge force is increased by the lever mechanism by the rotation of the clamp rod around the pin, so that a large clamping force can be obtained. (6) Since the clamp rod is reliably retracted to a position where it does not interfere, the loading and unloading of the work is performed safely and quickly.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing an entire structure of an embodiment of the present invention.

FIG. 2 is a top view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is an axial sectional view for explaining the operation (unlocking) of the present embodiment.

FIG. 6 is an axial sectional view for explaining the operation (unlocking) of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compact clamp apparatus 2 Case main body 3 Cylinder 4 Sliding block 5 Clamp rod 6 Clamp lock member 7 Spring 8 Guide roller 9 Wedge surface 10 Work 11 Pin 12 Front plate 13 Rear plate 14 Frame 15 Sliding chamber 16 Box body 17 Non-moving side 18 Stand 19 Cylinder 20 Rubber member 21 Support pin 22 Lubricating oil supply pipe 23 Supply hole 24 Guide chamber 25 Rear end surface 26 Stepped surface 27 Through hole 28 Through hole 29 Through hole 30 Supply hole 31 Lubricating oil supply hole 32 Clamp Part 33 Support pin 34 Bush 35 Piston rod 36 Relief hole 37 Boss part 38 Rear surface 39 Front surface 40 Work gripper

Claims (1)

(57) [Scope of request for utility model registration] 1. A case body having a sliding chamber, a cylinder fixed to the rear end side, and a sliding body slidably supported in the sliding chamber by a predetermined stroke and forming a guide chamber therein. A block, a lever-like member pivotally supported at an intermediate portion thereof by a pin fixed to the sliding block, and a clamp portion which abuts and engages a work at a front end side and a guide roller at a rear end side. A clamp rod, which is slidably supported in the guide chamber, is connected to the cylinder, and has a wedge surface which is engaged with the guide roller so as to be able to be attached to and detached from the guide roller; Wherein the clamp lock member comprises a spring which presses the clamp lock member toward the rear end surface of the guide chamber to urge the wedge surface and the guide roller in a direction to release the engagement. of The stroke is formed from a length at which the clamp portion can be moved to a position at least not interfering with the work to be carried in and out, and the inclination direction of the wedge surface is such that the wedge surface is pressed into engagement with the guide roller to engage with the guide roller. The clamp is formed so as to move the clamp in the unclamping direction of the work, and this clamping force
It is enlarged by the lever mechanism of the clamp rod that rotates
A compact clamp device characterized by being configured as possible .