JPH0911073A - General purpose positioning clamp device - Google Patents

Abstract

PURPOSE: To realize a general purpose positioning clamp device in which clamp pressure or the like can be controlled arbitrarily and which can cope with a noncircular work. CONSTITUTION: In four clamp units 20A-20D, each clamp plate 22 is turned to bring a clamp pin 23 into contact with a work W1 . A driving part for turning each clamp plate 22 has a tooth belt 30 for transmitting the driving force of a torque motor 32 to a driven pulley 25 integrated with each clamp shaft 21, whereby the clamp pressure is controlled by controlling the driving force of the torque motor 32, and the fitting positions of the clamp units 20A-20D are changed to cope with a work of a special form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precision processing machine for processing precision parts such as optical lenses or an automatic assembling apparatus for automatically assembling the precision parts. The present invention relates to a general-purpose positioning clamp device for accurately positioning with respect to.

[0002]

2. Description of the Related Art When processing precision parts such as optical lenses or when assembling them automatically, it is necessary to position a work (precision parts) with high precision with respect to a processing table, a hand of an assembling device, or the like. The positioning device used for such positioning is required to be capable of quickly clamping and positioning a work with a smooth operation and capable of coping with a work having a different shape or size at any time.

Conventionally, various devices have been developed for clamping a work by bringing a plurality of chucking arms, gripping members such as clamp pins or the like into contact with the outer peripheral surface or the inner peripheral surface of the work, and for example, guide pins are used. Rotating chuck capable of rotating and revolving to clamp the chucking arm (see Japanese Patent Laid-Open No. 60-62491), and gripper chuck driving a tightening lever by a gear meshing with a rack (Japanese Patent Laid-Open No. 58-56711). For example, a chucking device (see Japanese Patent Laid-Open No. 62-297003) for moving a gripping member that grips the inner peripheral surface of a work by a cam is known.

[0004]

However, according to the above-mentioned conventional techniques, the drive unit for simultaneously driving the plurality of gripping members transmits the driving force by the guide pin, the cam, the gear, or the like. Since the frictional resistance of these contact surfaces is non-uniform and easy to rattle, it is not possible to obtain a smooth clamping operation, and it is also impossible to control the clamping speed and clamping pressure in a wide range. However, since it is not easy to change the clamp position of each gripping member, there is an unsolved problem that it cannot easily cope with a work having a different shape or a work having a different size.

The present invention has been made in view of the unsolved problems of the above-mentioned conventional techniques, and is capable of accurately positioning a work by a smooth clamping operation and controlling the clamping speed and the clamping pressure over a wide range. It is also an object of the present invention to provide a general-purpose positioning clamp device that can freely handle irregularly shaped works and works of different sizes.

[0006]

In order to achieve the above-mentioned object, a general-purpose positioning clamp device of the present invention comprises a mounting table supported by a supporting means and a plurality of rotating bodies each rotatably supported by the supporting means. And a driving means having a toothed belt that engages with each rotating body and rotates the same by rotating the rotating body.

The clamp means may have a clamp member which is rotated by the rotation of each rotating body.

Tension adjusting means for adjusting the tension of the tooth profile belt may be provided.

The drive means may include a torque motor.

A powder magnet brake for controlling the driving force of the torque motor may be provided.

It is preferable that the mounting table has suction means for sucking the work.

It is preferable that at least one rotating body is configured so that its relative position with respect to the supporting means can be changed.

It is preferable that at least one rotating body is configured to be detachable from the supporting means.

[0014]

The work is positioned by placing the work on the mounting table and rotating each rotating body to close the clamp means. Since the frictional resistance of the contact surface between the toothed belt and each rotating body is uniform and there is no risk of rattling, the driving force of the torque motor etc. is stably transmitted to each rotating body, and therefore the clamping operation (opening / closing operation) of the clamping means. Can be done smoothly.

Further, if the tension adjusting means for adjusting the tension of the toothed belt is provided, a more stable and smooth clamping operation can be obtained.

If the drive means has a torque motor, the clamp speed of the clamp means can be arbitrarily controlled in a stepless manner, and if it is a circular work piece, the work piece having different dimensions can be used as it is without adjusting the driving force or the like. Can handle.

If a powder magnet brake for controlling the driving force of the torque motor is provided, the clamping pressure of the clamping means can be controlled freely.

If the mounting table has suction means for sucking the work, it is possible to prevent the work from being displaced after releasing the clamp pressure of the clamp means.

If at least one rotating body is constructed so that its relative position with respect to the supporting means can be changed or is detachable from the supporting means,
In addition to easily handling irregularly shaped workpieces and workpieces with different dimensions, it is also extremely easy to change the positioning position of the workpieces.

[0020]

An embodiment of the present invention will be described with reference to the drawings.

1A and 1B show a general-purpose positioning clamp device E according to one embodiment, FIG. 1A is a plan view thereof, and FIG. 1B is an explanatory view for explaining only a drive section. The general-purpose positioning clamp device E includes first to fourth clamp units 20A to 20D that are detachable clamp means with respect to a base 10 that is a support means, as shown in FIG. Each of the clamp units 20A to 20D has a clamp plate 22 that is a clamp member having one end fixed to the head portion 21a (see FIG. 2) of the clamp shaft 21, and a clamp pin 23 held at the other end. 21 is bearing 2
4, a driven pulley 25, which is a rotating body, is fixed to the lower end of the clamp shaft 21 as shown in FIG. A screw 22a for fixing each clamp plate 22 to the head 21a of the clamp shaft 21 is provided.
Is screwed to the head of the clamp shaft 21 by passing through an arcuate hole 22b provided in the clamp plate 22, and by loosening the screw 22a, the attachment angle of the clamp plate 22 to the clamp shaft 21 is changed. It is configured to be able to.

The driven pulley 25 of each of the clamp units 20A to 20D is rotated in the same direction by the toothed belt 30, and the toothed belt 30 has a drive pulley 31a and a drive belt 31b, and a torque motor 32 which constitutes a driving means together with these. Driven by.

First and third clamp units 20
The bearings 24 of A and 20C are held in circular mounting holes provided at predetermined positions of the base 10 and fixed to the base 10 by screws. The bearings 23 of the second and fourth clamp units 20B and 20D respectively have a pair of arc-shaped mounting holes 11b and 11 provided in the base 10.
held on the base 10 at any position along them.
Can be screwed freely.

First to fourth clamp units 20A-2
As shown in FIG. 2, 0D is arranged around a suction table 40, which is a mounting table, and the suction table 40 exhausts a suction pad 41 fixed to the base 10 and a space portion provided in the center thereof. Each of the clamp units 2 has an exhaust line 42 which is a suction means for carrying out a disk-shaped work W ₁ carried into the suction table 40 by a carry-in hand (not shown) or the like.
After positioning by 0A to 20D, exhaust line 4
The space W of the suction pad 41 is evacuated by 2 and the work W ₁ is sucked onto the suction pad 41, and the work W ₁ is made to stand by without being displaced until it is supplied to the automatic processing machine or the automatic assembling apparatus by a carrying out hand or the like.

The first clamp unit 20A has a second driven pulley 26 that is integral with the driven pulley 25, and the driving force of the torque motor 32 is the driving force from the motor shaft via the drive pulley 31a and the drive belt 31b. 1 is transmitted to the second driven pulley 26 of the clamp unit 20A,
As a result, the clamp shaft 21 of the first clamp unit 20A is rotated, and at the same time, the toothed belt 30 is driven to drive the clamp shaft 21 of the remaining clamp units 20B to 20D.
To rotate. In this way, each clamp unit 2
The clamp shafts 21 of 0A to 20D rotate in the clockwise or counterclockwise direction by the same amount.
2 is rotated in the same direction, and each clamp pin 23 is pressed against the outer peripheral surface of the work W ₁ to clamp it.

A finger 27 is provided at the lower end of the clamp shaft 21 of the third clamp unit 20C, and when each clamp plate 22 is retracted from the clamp position, it is rotated beyond a predetermined retract position. The finger 27 is configured to be detected by the position sensor 28 and to give an alarm.

Since the work W ₁ has a disk shape, the clamp shaft 21 of each of the clamp units 20A to 20D is attached to the suction table 4.
If the circle R (see FIG. 3) centering on the central axis O of 0 is arranged at a position that divides it into four equal parts, each clamp unit 20A
The pressing force of the clamp pins 23 of ˜20 D against the work W ₁ is uniformly distributed in the circumferential direction of the work W ₁ .

The driving force of the torque motor 32 is applied to each of the clamp units 20A to 20D via the toothed belt 30.
Since it is transmitted almost uniformly to the clamp shaft 21 of the workpiece W ₁ , uniform pressing force acts on the outer peripheral surface of the work W ₁ from four directions, whereby the workpiece W ₁ is accurately positioned at a position centered on the central axis O of the suction table 40. To be done. The pressing force acting on the outer peripheral surface of the work W ₁ , that is, the clamp pressure can be arbitrarily adjusted by changing the driving force of the torque motor 32.

The tension of the toothed belt 30 is the tension pulley 33 (see (b) of FIG. 1) which is a tension adjusting means.
It can be adjusted arbitrarily by moving. As a result, the clamp operation of each of the clamp units 20A to 20D can be made smoother and more stable.

Further, each of the clamp units 20A to 20D
The rotation speed of the clamp plate 22, that is, the clamp speed is adjusted by transmitting the braking force of the powder magnet brake 34 to the motor shaft of the torque motor 32 through the bevel gear train 34a and controlling the rotation speed thereof.

After the work W ₁ is positioned in this manner, the suction line 40 is moved by the exhaust line 42 as described above.
The work W ₁ is attracted to the suction pad 41 by exhausting the space of
Then, the torque motor 32 is reversely rotated to release the clamping force of each of the clamp units 20A to 20D. In this state, the workpiece W ₁ is supplied to a predetermined processing machine or assembling apparatus until it is time to supply it.

This embodiment is widely used, for example, for intermediate positioning in the process of sequentially taking out workpieces such as lenses randomly stored in the stocker and supplying them to a grinding machine or the like, and a uniform clamp as described above. accurately performed Moreover clamping force and clamping speed positioning of the workpiece on top that can be adjusted freely by the force, as shown in FIG. 3 (a), if the workpiece W ₂ is a small-diameter disc-shaped than the circular R , Even if the dimensions are different, the positioning can be performed in the same manner as the work W ₁ . Further, as shown in FIG. (B), the workpiece W ₃ against suction table 40 the spacing of the abutment position with respect to the workpiece W ₃ of the clamp pins 23 of each clamp unit 20A~20D by uneven Can be positioned in an eccentric state. Further, as shown in (c) of the figure, when the inner peripheral surface of the cylindrical work W ₄ is clamped, the torque motor 32 may be rotated in the reverse direction.

If the work W ₅ has a non-circular cross section as shown in FIG. 4, it can be dealt with at any time by changing the mounting positions of the second to fourth clamp units 20B to 20D as follows. .

First, as shown in FIG. 4A, the third clamp unit 20C is removed from the circular mounting hole of the base 10, and the second and fourth clamp units 20B and 20D are fixed to the base 10. Loosen the screw
It is in a movable state along the arcuate mounting holes 11b and 11d. First, as shown in FIG. 4B, the clamp pin 23 of the first clamp unit 20A is brought into contact with the work W ₅ on the suction table 40, and then, as shown in FIG. The clamp unit 20B is moved to the right side in the drawing along the mounting hole 11b to be screwed to the base 10, and further, the screw 22a (see FIG. 1) for fixing the clamp plate 22 to the clamp shaft 21 is loosened and the clamp pin 23 is fixed. The clamp plate 22 is rotated until it contacts the work W ₅ , and the screw 22a is tightened at that position. In the same manner, the clamp pin 23 of the fourth clamp unit 20D is brought into contact with the work W ₅ as shown in FIG. Finally, rotate the torque motor 32 in the reverse direction to rotate all the clamp pins 2.
3 away from the work W ₅ and then the torque motor 32
Is rotated forward to clamp the work W _5, and it is confirmed that there is no gap between each clamp pin 23 and the work W ₅ .

[0035]

Since the present invention is configured as described above, it has the following effects.

Workpieces can be accurately positioned with a smooth clamp operation, and the clamping speed and clamping pressure can be controlled over a wide range. Also, it is possible to easily handle irregularly shaped workpieces and work with different dimensions. it can.

Such a general-purpose positioning clamp device is
By providing the workpiece while it is being conveyed to the precision processing machine or assembly device, positioning of the workpiece with respect to the processing table of the precision processing machine or the hand of the assembly device can be performed quickly and with high accuracy, greatly improving processing accuracy and assembly accuracy. I can contribute.

[Brief description of the drawings]

1A and 1B show a general-purpose positioning clamp device according to an embodiment, FIG. 1A is a schematic plan view thereof, and FIG. 1B is a diagram illustrating a drive unit.

2 is a partial cross-sectional elevational view showing a cutaway portion of the apparatus of FIG.

FIG. 3 illustrates positioning of various works having a circular cross section.

FIG. 4 illustrates positioning of a work having a non-circular cross section.

[Explanation of symbols]

 10 Bases 11b and 11d Mounting Holes 20A to 20D Clamp Unit 21 Clamp Shaft 22 Clamp Plate 23 Clamp Pin 24 Bearing 25 Driven Pulley 30 Toothed Belt 32 Torque Motor 40 Adsorption Stand

Claims (8)

[Claims] 1. A mounting table supported by a supporting means, a plurality of rotating bodies each rotatably supported by the supporting means, and a clamping means that opens and closes by rotation of each rotating body.
A general-purpose positioning clamp device having drive means provided with a toothed belt for engaging with and rotating each rotating body. 2. The general-purpose positioning clamp device according to claim 1, wherein the clamp means has a clamp member that is rotated by the rotation of each rotating body. 3. A tension adjusting means for adjusting the tension of the toothed belt is provided.
The general-purpose positioning clamp device described. 4. The general-purpose positioning clamp device according to claim 1, wherein the driving means has a torque motor. 5. The general-purpose positioning clamp device according to claim 4, further comprising a powder magnet brake for controlling the driving force of the torque motor. 6. The general-purpose positioning clamp device according to claim 1, wherein the mounting table has suction means for sucking the work. 7. The general-purpose positioning clamp device according to claim 1, wherein at least one rotating body is configured so that its relative position to the supporting means can be changed. 8. The general-purpose positioning clamp device according to claim 1, wherein at least one rotating body is configured to be detachable from the supporting means.