JPH03281136A - Workpiece tightening device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to cutting of a workpiece such as a rotating polygon mirror, and after angular positioning of the workpiece, the workpiece is fixed (workpiece fixing table). This invention relates to a workpiece tightening device for tightening and fixing a workpiece in a non-rotating state.

[Prior Art] A conventional workpiece tightening device includes a manual workpiece tightening device as shown in FIG.

As shown in FIG. 4, a base 32 is fixed to a main body 31 of the processing machine with a plurality of bolts 34.

The base 32 has a contact portion 32a, and a threaded shaft 35 is protruded from the contact portion 32a, and a tightening nut 33 is screwed into the threaded portion on the free end side. Reference numeral 36 denotes a presser member, which is fitted into a piece 37 slidably fitted in the axial direction to the screw shaft 35 so as to be slidable in the axial direction.

In the above-mentioned workpiece tightening device, the workpiece 38 and the piece 37 fitted with the holding member 36 are fitted into the threaded shaft 35 sequentially in advance, and the tightening nut 33 is loosely screwed.

After angular positioning of the workpiece 38 using a known angle setting device (not shown), the tightening nut 33 is tightened with a predetermined torque using a torque wrench, and the workpiece 38 is attached to the contact portion 32a via the holding member 36. The workpiece 38 is fixed by pressing toward the same direction.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, when tightening the tightening nut by threading, it is necessary to perform torque management by tightening with a torque wrench, which is time-consuming and also causes the presser member to tilt. There is a problem in that uneven contact occurs with the workpiece, resulting in deformation of the workpiece and reduction in machining accuracy. Another problem is that automation is extremely difficult because each tightening nut is rotated using a torque wrench.

The present invention has been made in view of the above-mentioned problems of the conventional technology, and it automatically fixes the workpiece after angular positioning, and furthermore, uneven contact of the presser member against the workpiece occurs. The object of the present invention is to provide a workpiece tightening device that can uniformly tighten the workpiece without any twisting.

[Means for Solving the Problems] In order to achieve the above object, the workpiece tightening device of the present invention includes a workpiece that is integrally provided with a clamping fluid pressure cylinder, and a workpiece that is disposed on the clamping fluid pressure cylinder. a piston having a rod protruding from the distal end surface of the rod, a presser piece having a workpiece suction means slidably fitted in the rod in the axial direction, and a presser foot for holding the presser piece. The piece supports a presser piece holder having a piece suction means and is equipped with a pressing unit that is reciprocally movable in the axial direction of the rod, and the piece has an engaging member for engaging the presser piece with the rod, The workpiece is configured to be clamped in a non-rotating state between the clamp and the presser foot.

Further, the engagement member for engaging the presser piece with the rod includes an engagement plate in which a hole having a notch that engages with the engagement portion of the rod is formed, and the engagement plate has the notch that engages the engagement portion of the rod. It may be biased by an elastic body in the direction of engagement with the portion.

Furthermore, the work piece suction means is a guide hole selectively communicated with the vacuum generation source and the pressurized fluid generation source, and the presser piece suction means for holding the presser piece is used as the vacuum generation source and the pressurized fluid generation source. It is preferable to use a conductive hole that is selectively communicated with.

[Example] Embodiments of the present invention will be explained based on the drawings.

FIG. 1 is a sectional view showing the main parts of an embodiment of the present invention.

As shown in FIG. 1, the indexing device main body 1 of the processing machine includes:
The bolts 2 are fixed by known fixing means such as bolts. The clamp 2 is composed of a base 2b having a flange portion 2c and a contact portion 2a projecting from the base 2b and having a smaller diameter than the base 2b. A piston 5 is disposed within the clamping fluid pressure cylinder 4. The rod 5a of the piston 5 is slidably supported in a through hole passing through the base 2b and the contact portion 2a, and its free end protrudes from the tip end surface of the contact portion 2a. Reference numeral 8 denotes a workpiece such as a rotating polygon mirror that is fitted into the rod 5a so as to be movable in the axial direction of the rod 5a. It is inserted so that it can slide freely in the direction.

On the other hand, the pressing unit 11 is provided on a slider 10 that reciprocates in the horizontal direction shown in the figure (the same direction as the axial direction of the rod 5a) by a known drive means (not shown). In the upper part of the pressing unit 11 in the drawing, a presser foot holder 13 is pivotally supported in a non-rotating state so as to be slidable in the axial direction at a portion coaxially with the presser foot 6. An end plate 13a is fixed to the right end surface of the presser foot holder 13 in the drawing by a plurality of ports 13b, etc., and a compression spring 14 is interposed between the end plate 13a and the main body of the pressing unit 11 to keep the presser foot holder 13 constant. It is biased toward the right side in the figure. Reference numeral 13d is a guide hole which is selectively communicated with a vacuum generation source and a pressurized fluid generation source by known means.

The engagement member pressing unit 12 is supported by the pressing unit 11, and specifically, the main body member 12a is fixed to the pressing unit by fixing means such as a plurality of bolts 11a (only one of which is shown in the drawing). 11, and a pressing member 12b connected to a piston rod 12c driven by a fluid pressure cylinder (not shown) in the main body member 12a is in a non-rotating state in a direction perpendicular to the moving direction of the slider 10. It is pivotally supported so that it can freely slide.

Next, the configuration of the presser foot 6 will be explained.

As shown in FIGS. 1 and 2, the presser piece 6 has a substantially cylindrical shape, and has a guide hole in the center of the surface facing the holder 2 into which the free end of the rod 5a is slidably fitted. is formed,
On the other hand, a small-diameter protrusion 6b is protruded from the end surface on the presser foot holder side and is fitted in a through hole 13c that penetrates the presser foot holder 13 in the axial direction through a sealing member in an airtight manner.

Reference numeral 6a indicates a guide hole, and the guide hole 6a penetrates from the surface of the presser foot 6 facing the workpiece 8 to the tip end surface of the protruding portion 6b. As a result, the presser foot 6 is attached to the presser foot holder 13.
When the presser foot is held in place, the through hole 13 of the presser foot holder 13
c, and is configured to selectively communicate with a vacuum generation source and a pressurized fluid generation source via a conduit or the like with a switching valve (not shown) connected to the base 17 interposed therebetween. In other words, a suction means for the workpiece 8 is configured.

A screw hole 7b into which the lid 7 is screwed is formed in the upper part of the axial center of the presser piece 6, and a screw hole 7b into which the lid 7 is screwed is formed in a part (lower part in the diagram) opposite to this in the radial direction. A hole 7C is formed into which the disc-shaped head 3d is slidably fitted. A slit passing through from the bottom surface of the hole 7c to the bottom surface of the screw hole 7b is formed, and the engagement plate 3a protruding from the head 3d of the engagement member 3 is slidably inserted into the slit. ing. Reference numeral 7a denotes a plurality of compression springs as elastic bodies, which are interposed between the lid 7 and the head 3d, and always urge the engaging member 3 downward in the drawing, so that the engaging member 3 moves downward in the drawing. A notch 3b provided in the hole 3C of the engagement plate 3a is configured to engage with a small diameter portion 5b serving as an engagement portion of the rod 5a. The reference numeral 9 is a cylindrical seal made of rubber, soft synthetic resin, etc.
It is fitted onto the outer periphery of the presser piece 6 so as to cover the entirety of the hole 7a and the hole 7a, and prevents dust and the like from entering the sliding portion of the engaging member 3.

Reference numeral 15 denotes an angle determining device, which may be a known device, but when performing angular positioning of the workpiece 8, it approaches the workpiece (hereinafter referred to as "advance") and performs operations other than angular positioning. It is disposed on a moving device (not shown) so as to move away (hereinafter referred to as "retreating") to a position where it does not get in the way when moving, and is provided with a sensor (not shown) to be described later.

Next, the operation of the unimplemented example will be explained with reference to FIG.

(1) In the initial state, the pressing unit 11 is moved to the right side in the figure from the position shown in FIG.
"retracted position". ), and the workpiece-side surface of the presser foot 6 vacuum-adsorbed to the presser foot holder 13 (hereinafter referred to as the "pressing surface") is separated from the tip of the rod 5a by a predetermined distance.

Further, the pressing member 12b of the engaging member pressing unit 12 is
The engagement plate 3a contacts the screw member 3e of the engagement member 3 and presses the engagement member 3, resisting the elastic force of the plurality of compression springs 7a.
The center of the hole 3C is moved to a position coaxial with the axis of the rod 5a, that is, to a disengagement position (step 102).

(2) When a transport start signal is transmitted to a known automatic hand (not shown), the automatic hand grips the workpiece 80 and transports it to a position facing the pressing surface of the presser foot 6. In this case, a pin is provided at the center of the gripping part of the auto hand, and by inserting the pin into the hole into which the rod 5a of the presser piece 6 is inserted, the center hole of the workpiece 8 is aligned with the presser piece 6.
It is best to make it coaxial with the axis of the

At this time, vacuum suction is performed by a vacuum generation source (not shown) connected to the mouthpiece 17 that communicates with the guide hole 6a of the presser piece 6 through the through hole 13c, and the workpiece 8 is pressed by the presser piece 6. Vacuum adsorb onto the surface. To confirm that this vacuum suction has been performed accurately, a vacuum sensor (not shown) provided in the pipe between the base 17 and the vacuum source detects the detection and outputs a signal A (steps 103, 104).

(3) Upon receiving signal A, the automatic hand moves backward, and a sensor provided on the automatic hand side detects the backward movement of the automatic hand, and outputs signal B (step 105.1).
06).

(4) Upon receiving the signal B, the pressing unit 11 moves the slider 1
As a result, the workpiece 8 and the presser piece 6 are fitted onto the rod 5a and slide on the rod 5a, and the workpiece 8 is the minute distance (1 m
(approx. m) and stop in front of you. This stop position is slider 10
A sensor provided on a driving means such as a fluid pressure cylinder (not shown) for reciprocating the slider (hereinafter referred to as "sensor provided on the slider 10 side") detects the slider and outputs a signal C (steps 107 and 108). .

(5) In response to the signal C, the guide hole 6a is switched to communicate with the pressurized fluid generation source, so that a reverse injection is performed from the guide hole 6a of the presser piece 6, and the workpiece 8 is separated from the presser piece 6. The workpiece 8 is free to move and prepared for angular positioning (step 109).

(6) In parallel with (5) above, in response to the signal C, the angle determining device 15 is advanced toward the workpiece 8 to perform angular positioning of the workpiece 8. Completion of this angular positioning is detected by a sensor provided in the angular positioning device 15, and a signal is output (steps 109 and 110).

(7) Upon receiving the signal, a drive device such as a fluid pressure cylinder (not shown) of the engaging member pressing unit 12 is activated, and the pressing member 12b is moved backward. As a result, the engaging member 3 moves downward in the drawing as described above, and the notch 3b of the hole 3c engages with the small diameter portion 5b of the rod 5a. This pressing member 12b
A sensor (not shown) provided in the engaging member pressing unit 12 detects the retreat of the engaging member and outputs a signal E (Step II
+, +12).

(8) In response to the signal E, the clamping fluid pressure cylinder 4 moves to the left in the figure (hereinafter referred to as "advance"), and is covered by the presser piece 6 toward the distal end surface of the contact portion 2a of the retainer 2. The workpiece 8 is pressed and clamped. That is, the workpiece 8 is tightened and fixed between the presser foot 2 and the presser foot 6 in a non-rotating state. As the kneading process progresses, the presser foot holder 13, which is vacuum-adsorbed with the presser foot 6, moves forward while being guided by the bearing of the pressing unit 11 against the elastic force of the compression spring 14. As a result, the end plate 13a and the proximity switch 16 are separated, so the proximity switch 16 outputs the signal F (step 113).
, 114).

(9) Upon receiving the signal F, the angle determining device 15 moves backward, and the sensor provided in the angle determining device 15 detects the completion of the backward movement and outputs the signal D'. Further, pressurized fluid is back-injected from the guide hole 13b to separate the presser piece 6 from the presser piece holder 13. Then, the presser foot holder 13 retreats due to the elastic force of the compression spring 14, the end plate 14 approaches the proximity switch 16, and the proximity switch 16 outputs the signal F' (step 11).
5°116,]7,118).

(10) In response to the signals D' and F', the pressing unit 11 retreats, the sensor provided on the slider 10 side detects the completion of this retreat, and outputs the signal C' (step 119
．． 120).

(11) In response to the signal C', one side of the workpiece 8 to be processed is processed. After blowing down, the machined surfaces are sequentially indexed by an indexing device provided on the main body, and after a predetermined number of surfaces have been machined, the machine is returned to the initial indexed position. A sensor provided on the processing machine side detects the end of this processing and outputs a signal G (steps 121, 122).

4 (12) Upon receiving the signal G, the pressing unit 11 moves forward again and 1. Return to the state of J2 (4). Slide this to slider 10
A sensor installed on the side detects and outputs a signal C (
123, 124).

(13) Upon receiving the signal C'', the clamping fluid pressure cylinder 4 moves back and releases the clamp. This clamp release is detected by a sensor provided on the second side and outputs a signal H (steps 125, 126).

(14) Upon receiving the signal H, the pressing member 12b moves forward, presses the engaging member 3 of the presser foot 6, and moves so that the hole 3a of the engaging plate 3a is positioned coaxially with the rod 5a, that is, engages. will be canceled. The sensor provided on the engaging member pressing unit 12 side detects this in the same way as in (7) above, and the signal E"
At the same time as the output, the presser piece holder 13 vacuum-chucks the presser piece 6 and the workpiece 8. The vacuum sensor detects this and outputs a signal I (steps 127, 128).

(15) In response to the signals ■ and E', the pressing unit 11 retreats, a sensor provided on the slider 10 side detects this, and outputs a signal C'' (Stella 5 B129, 130).

(16) Upon receiving the signal C'', the auto hand moves to the workpiece 8.
I'm going to go get it. A sensor provided on the auto hand side detects this and outputs a signal B° (step 131, 1
32).

(17) Upon receiving the signal B', pressurized fluid is injected back from the guide hole 6a of the presser piece 6 to separate the workpiece 8 from the presser piece 6, and then the auto hand is moved backward to remove the workpiece 8. Take out (
Step l33).

In the above embodiment, the workpiece 8 may be any object having a shape similar to that of the rotating polygon mirror. Furthermore, although it is desirable to use a gas such as air or an inert gas as the pressurized fluid, it is also possible to use a liquid.

Furthermore, instead of vacuum suction, the workpiece attracting means may have an electromagnet embedded in the surface of the presser piece 6 that faces the workpiece 8, that is, the pressing surface side, and perform magnetic attraction. In this case, the workpiece 8 must be a magnetic material, and the guide hole 6a only needs to be communicated with the pressurized fluid source. This 1 also applies to the presser foot halter 13, so its explanation will be omitted.

[Effects of the Invention] Since the present invention is configured as described above, it produces the effects described below.

Since the workpiece is only pressed in the axial direction and no rotational force is applied, the holding member does not hit the workpiece unevenly as in conventional technology, and the workpiece can be processed with uniform pressure. Since the object can be fixed and the workpiece will not be deformed, the processed grain size will be improved.

In addition, it is possible to automate the entire process including supplying and taking out the workpiece, and since the workpiece is attracted to the presser foot by the suction means, the workpiece is tightened between the presser foot and the workpiece. There is no risk of inadvertent movement even during other processes.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts showing one embodiment of the present invention, FIG. 2 is a sectional view taken along line AA' in FIG. 1, FIG. 3 is a flowchart showing the operation of this embodiment, and FIG. 4 7 is a sectional view of a main part showing a conventional workpiece tightening device. 1... Indexing device main body, 2... Hiring, 2a...
Contact part, 2b... base, 2c... flange part, 3... engaging member, 3a... engaging plate,
3b...notch, 3c...hole,
3d...Head, 3e...Screw member, 4...Fluid pressure cylinder for clamp, 5...Piston, 5a...Rod, 5b
...Small diameter part, 6...Presser piece, 6a...Guiding hole, 7...Lid, 7a, 14...Compression spring, 8...Workpiece, 9...Seal, 1
0... Slider, 11... Pressing unit, 12... Engaging member pressing unit, 12b... Pressing member, 13... Presser piece halter, 13a... End plate, 15... Angle Decision device, 16... Proximity switch. 8

Claims (1)

[Claims] 1. A piston having a rod integrally provided with a clamping fluid pressure cylinder, a rod protruding from a distal end surface of the rod disposed on the clamping fluid pressure cylinder, and the rod. a presser foot having a work piece suction means slidably inserted in the axial direction; and a presser foot holder having a presser foot suction means for holding the presser foot; a pressing unit that is reciprocally movable; the presser piece has an engagement member for engaging the presser piece with the rod, and the workpiece is clamped in a non-rotating state between the rod and the presser piece; A workpiece tightening device characterized by comprising: 2. The engagement member that engages the presser piece with the rod includes an engagement plate in which a hole is formed with a notch that engages with the engagement portion of the rod, and the engagement plate has the notch that engages the engagement portion of the rod. 2. The workpiece tightening device according to claim 1, wherein the workpiece tightening device is biased by an elastic body in a direction to engage the portion. 3. Claim 1 or 2, wherein the workpiece adsorption means is a guide hole selectively communicating with a vacuum generation source and a pressurized fluid generation source.
The workpiece tightening device described. 4. The work clamping device according to claim 1, 2 or 3, wherein the presser foot suction means for holding the presser piece is a guide hole selectively communicated with a vacuum generation source and a pressurized fluid generation source.