JP3249717B2 - General-purpose positioning 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 precision processing machine for processing precision parts such as optical lenses or an automatic assembly apparatus for automatically assembling the precision parts. The present invention relates to a general-purpose positioning clamp device for accurately positioning with respect to a workpiece.

[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 or a hand of an assembling apparatus. The positioning device used for such positioning is required to be capable of quickly clamping and positioning a work with a smooth operation and to be able to cope with a work having a different shape and size as needed.

Conventionally, various devices have been developed for clamping a work by holding a plurality of chucking arms, clamping pins, and other gripping members against the outer and inner peripheral surfaces of the work, and for example, using a guide pin. (See Japanese Patent Application Laid-Open No. 60-62491) and a gripper chuck that drives a tightening lever by a gear meshing with a rack (Japanese Patent Application Laid-Open No. 58-56711). And a chucking device (see Japanese Patent Application Laid-Open No. 62-297003) in which a gripping member for gripping the inner peripheral surface of a work is advanced and retracted by a cam.

[0004]

However, according to the above-mentioned prior arts, in each case, a driving unit for simultaneously driving a plurality of gripping members transmits a driving force by a guide pin, a cam, a gear, or the like. However, the frictional resistance and the like of these contact surfaces are non-uniform and easily rattled, so that a smooth clamping operation cannot be obtained, and it is impossible to control a wide range of clamping speed, clamping pressure, and the like. However, there is an unsolved problem such that it is not easy to change the clamp position of each gripping member, so that it is not easy to cope with a deformed work or a work having a different size.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned unsolved problems of the prior art, and aims to accurately position a workpiece by a smooth clamping operation and to control a clamping speed and a clamping pressure in a wide range. It is another object of the present invention to provide a general-purpose positioning and clamping device which can easily handle irregularly shaped works and works having different dimensions.

[0006]

In order to achieve the above object, a general-purpose positioning and clamping device according to the present invention comprises a support means.
When a plurality of rotating body rotatably supported on each of said support means, a clamp means for opening and closing by rotation of the coupled <br/> each rotary member to each of the plurality of rotating bodies, each rotary member a drive means having a belts for rotating it engages, at least one of the plurality of rotating bodies is moved against the support means, the rotary to match the work
It is characterized by having position changing means for changing the mounting position of the body and the clamp means .

The position changing means holds the bearing of the rotating body.
It has an arc-shaped mounting hole and is supported at any position along it
The bearing may that have been configured to be secured to the unit.

[0008]

[0009]

The work is positioned on the mounting table by rotating each rotating body and closing 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 possibility of rattling, the driving force of the torque motor or the like is stably transmitted to each rotating body, and therefore, the clamping operation (opening / closing operation) of the clamping means. Can be performed smoothly.

[0010] At least one rotating body is provided with clamping means.
At the same time, since the mounting position with respect to the support means is configured to be freely changeable, a general-purpose positioning position that can easily cope with deformed works or works having different dimensions can be realized.

[0011]

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

FIG. 1 shows a general-purpose positioning and clamping device E according to an embodiment, wherein FIG. 1A is a plan view thereof, and FIG. The general-purpose positioning clamp device E is provided with first to fourth clamp units 20A to 20D, which are detachable clamp means with respect to the base 10 which is a support means, as shown in FIG. Each of the clamp units 20A to 20D has a clamp plate 22 which is a clamp member having one end fixed to the head (see FIG. 2) of the clamp shaft 21 and a clamp pin 23 held at the other end. Are rotatably supported by bearings 24, as shown in FIG.
A driven pulley 25 that forms a rotating body together with the clamp shaft 21 is fixed to a lower end of the clamp shaft 21 . In addition,
A screw 22a for fixing each clamp plate 22 to the head of the clamp shaft 21 is screwed to the head of the clamp shaft 21 through an arc-shaped hole 22b provided in the clamp plate 22. By loosening 22a, clamp shaft 2
It is configured such that the mounting angle of the clamp plate 22 with respect to 1 can be changed.

[0013] driven pulley 25 of each clamp unit 20A~20D is rotated in the same direction by the tooth belt 30 is a belt, toothed belt 30, the drive pulley 3
1a and a drive belt 31b, and are driven by a torque motor 32 constituting a driving means together with the drive belt 1b.

First and third clamp units 20
Each of the bearings 24A and 20C is held in a circular mounting hole provided at a predetermined position on the base 10, and is fixed to the base 10 with screws. The bearings 24 of the second and fourth clamp units 20B and 20D are held by a pair of arc-shaped mounting holes 11b and 11d, which are position changing means provided on the base 10, and are provided along any of these holes. The screw can be freely fixed to the base 10 at the position shown in FIG.

First to fourth clamp units 20A-2
2D, as shown in FIG. 2, the suction pad 40 is disposed around a suction table 40 serving as a mounting table. The suction table 40 exhausts a suction pad 41 fixed to the base 10 and a space provided at the center thereof. to an exhaust line 42 is a suction means, each clamp unit as described below the disk-shaped workpiece W _1, which is carried into the suction table 40 by the carrying hand or the like (not shown) 2
After positioning by 0A to 20D, the exhaust line 4
By exhausting the space of the suction pad 41 by 2, the work W ₁ is sucked to the space, and is kept on standby without causing a positional shift until it is supplied to an automatic processing machine or an automatic assembling device by a carry-out hand or the like.

The first clamp unit 20A has a second driven pulley 26 integrated with the driven pulley 25. The driving force of the torque motor 32 is transmitted from the motor shaft via a drive pulley 31a and a drive belt 31b. Transmitted to the second driven pulley 26 of the first 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 rotate the clamp shaft 21 of the remaining clamp units 20B to 20D.
To rotate. Thus, each clamp unit 2
0A to 20D of the clamp shaft 21 rotate clockwise or counterclockwise by the same amount.
Rotates the 2 in the same direction, to clamp it each clamp pin 23 is pressed against the outer peripheral surface of the workpiece W _1.

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, the finger 27 is rotated beyond a predetermined retract position. The finger 27 is detected by the position sensor 28 and is configured to generate an alarm.

[0018] Since the work W ₁ is a disc-shaped clamp shaft 21 of each clamp unit 20A~20D is suction table 4
If it is arranged at a position that divides a circle R (see FIG. 3) about the center axis O of 0 into four equal parts, each clamp unit 20A
Pressure applied to the workpiece W ₁ of the clamp pin 23 of ~20D is uniformly distributed in the circumferential direction of the workpiece W _1.

The driving force of the torque motor 32 is controlled by the clamp units 20A to 20D via the toothed belt 30.
Is transmitted almost uniformly to the clamp shaft 21 of the workpiece W ₁ , and a uniform pressing force acts on the outer peripheral surface of the work W ₁ from all directions, thereby accurately positioning the workpiece W ₁ at a position centered on the central axis O of the suction table 40. Is done. Pressing force or the clamping pressure acting on the outer peripheral surface of the workpiece W ₁ can be arbitrarily adjusted by changing the driving force of the torque motor 32.

The tension of the tooth-shaped belt 30 is controlled by a tension pulley 33 as tension adjusting means (see FIG. 1B).
Can be arbitrarily adjusted by moving. Thereby, the clamp operation of each of the clamp units 20A to 20D can be made smoother and more stable.

Each of the clamp units 20A to 20D
The rotation speed of the clamp plate 22, that is, the adjustment of the clamp speed, is performed by transmitting the braking force of the powder magnet brake 34 to the motor shaft of the torque motor 32 via the bevel gear train 34a and controlling the rotation speed.

[0022] After positioning the workpiece W ₁ in this way, the adsorption stage by an exhaust line 42 as previously described 40
Suction pads 41 of the work W ₁ by evacuating the space in the
Then, the torque motor 32 is rotated reversely to release the clamping force of each of the clamp units 20A to 20D. In this state, to wait until the time to supply the workpiece W ₁ to a predetermined machine or assembly apparatus.

The present embodiment is widely used for intermediate positioning in a process of sequentially taking out a work such as a lens randomly stored in a stocker and supplying the work to a grinding device or the like. 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 , be different dimensions can be positioned in exactly the same way 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. Furthermore, as shown in the figure (c), when clamping the inner peripheral surface of the cylindrical workpiece W ₄ may be caused to reverse rotation of the torque motor 32.

[0024] as long as the work W ₅ as shown in FIG. 4 has a non-circular cross-section, it corresponds optionally by changing the mounting position of the second to fourth clamp unit 20B~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 set to be movable along the arc-shaped mounting holes 11b and 11d. First, the workpiece W ₅ on the suction table 40, in Figure 4 as shown in (b) against a clamping pin 23 of the first clamp unit 20A person, followed by drawing a second, as shown in (c) The clamp unit 20B is moved to the right side in the figure along the mounting hole 11b and screwed to the base 10, and the screw 22a (see FIG. 1) for fixing the clamp plate 22 to the clamp shaft 21 is loosened to clamp the pin 23. There pivots clamp plate 22 until it abuts against the workpiece W _5, tightening the screws 22a at that position. In a similar manner, FIG.
The clamping pin 23 of the fourth clamp unit 20D is brought into contact with the workpiece W ₅ as shown in the (d). Finally, the torque motor 32 is rotated in the reverse direction so that all the clamp pins 2
3 in terms of alienated from the workpiece W _5, torque motor 32
The rotated forward by clamping the workpiece W _5, to confirm that there is no gap between each clamp pin 23 and the workpiece W _5.

[0026]

Since the present invention is configured as described above, the following effects can be obtained.

[0027] The workpiece can be accurately positioned by the smooth clamping operation, and the clamping speed and the clamping pressure can be controlled in a wide range. In addition, it can easily handle irregularly shaped workpieces and workpieces having different dimensions. it can.

Such a general-purpose positioning clamp device is
Provision of the workpiece to the processing table of the precision processing machine or the hand of the assembly device can be performed quickly and with high accuracy by providing the workpiece during the transfer of the work to the precision processing machine or assembly device, greatly improving the processing accuracy and assembly accuracy. Can contribute.

[Brief description of the drawings]

FIGS. 1A and 1B show a general-purpose positioning clamp device according to an embodiment, in which FIG. 1A is a schematic plan view and FIG.

FIG. 2 is a partial cross-sectional elevation view of the device of FIG. 1 with a portion cut away.

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]

 Reference Signs List 10 base 11b, 11d mounting hole 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 suction table

Continuation of front page (56) References JP-A-60-62491 (JP, A) JP-A-58-56711 (JP, A) JP-A-58-180901 (JP, A) (U, U) Shokai 53-115481 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B23Q 3/18 B23Q 3/06 303

Claims (2)

(57) [Claims] 1. A support means, a plurality of rotating body rotatably supported on each of said support means, said plurality of rotating bodies
And clamping means are connected to the respective opened and closed by rotation of the rotary member, a drive means having a belts for rotating it engages the respective rotating bodies, at least one of the plurality of rotating bodies They are moved in pairs on said support means, taken of the rotating body and the clamping means to fit the workpiece
Generalized positioning clamp device having a position changing means for changing the Ri attached position. 2. The method according to claim 1, wherein the position changing means has an arc-shaped mounting hole for holding a bearing of the rotating body, and the bearing is fixed to the supporting means at an arbitrary position along the hole. The general-purpose positioning clamp device according to claim 1, wherein: