JP2705769B2 - Work 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 an apparatus for clamping different types of workpieces, wherein the clamp position is changed by using a moving drive source of a processing unit.

[0002]

2. Description of the Related Art Conventionally, as a device for fixing a work to a jig plate, for example, a fixing device such as Japanese Patent Publication No. 55423 is known. This device is a fixing device that accurately attaches a work to a fixed position on a pallet that has been transported to a loading station of a transfer machine, and sandwiches the work between a pair of units.
The posture of the work is kept stable and fixed. As a device for accurately positioning and fixing a workpiece, for example, a device such as Japanese Patent Publication No. 63-7901 is known. This device supports the workpiece by three ball-pieces rotatably supported by spherical seats so that the positioning surface of the workpiece with respect to the pallet is not flat or has the correct position even if it has an arbitrary shape. It was made.

[0003]

However, in such a work fixing device, for example, in order to cope with a different type of work having a different work shape, for example, the tightening bolt is removed and set to a predetermined position. In such a case, it is necessary to perform an operation of changing the clamp arm or the like to a new position corresponding to the shape of the work and resetting the same, and there is a problem that it takes time to adjust the position. And the type of work is changed especially in the middle of the transfer line,
The fact that it takes time to respond to this means that the transfer line needs to be stopped, which is not preferable in terms of productivity.

[0004]

In order to solve this problem, the present invention arranges a jig stand unit in front of a processing unit provided with a spindle whose position can be adjusted, and arranges the jig stand unit around a vertical axis. In a work clamping apparatus in which a rotatable jig plate is provided and a work is clamped to the jig plate, a guide member is fixed to a rear surface side of the jig plate and slidable along the guide member. The clamp arm of the clamp unit integrally formed with the slide plate is protruded toward the front side of the jig plate so as to be able to advance and retreat, and an engagement hole is formed in the rear surface of the slide plate. Then, a holder mounted on the tip of the spindle of the processing unit is engaged with the engagement hole, and the slide plate is moved in accordance with the movement of the spindle to adjust the position of the clamp arm. Further, a plurality of positioning holes are provided on the guide member along the sliding direction of the slide member, and a positioning pin is provided on the slide plate so as to be movable forward and backward in a direction perpendicular to the sliding direction. An engaging groove is formed on the outer periphery of the positioning pin, and the holder is engaged with the engaging groove to move the spindle, whereby the positioning pin and the positioning hole are disengaged. Further, the engagement groove of the positioning pin is made to face the engagement hole of the slide plate.

[0005]

The work to be clamped by the jig base unit is processed by the processing unit, but it is necessary to adjust the clamp position of the jig base unit and the spindle position of the processing unit according to the type of work. Therefore,
When adjusting the spindle position of the processing unit, if the holder mounted on the tip of the spindle is engaged with the engagement hole of the slide plate, the clamp arm on the jig base unit side is used by using the drive means for adjusting the position of the spindle. Can be adjusted. Further, in order to position the slide plate, a positioning pin provided on the slide plate is fitted into a positioning hole of the guide member. The positioning pin is moved forward and backward in accordance with the movement to position or release the position of the slide plate. Then, by positioning the engagement groove of the positioning pin and the engagement hole of the slide plate at the same position, the slide plate can be moved quickly and smoothly after the positioning pin is moved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a work clamping apparatus according to the present invention will be described with reference to the accompanying drawings. 1 is a side view of the entire apparatus, FIG. 2 is a side view of a jig stand unit, and FIG. 3 is a front view of the same.

As shown in FIG. 1, a jig base unit 2 is arranged in front of the processing unit 1, and a work W to be clamped by the jig base unit 2 is processed by the processing unit 1. .

That is, the processing unit 1 is provided with a movable gantry 4 movable along the rail 3 in the X-axis direction (perpendicular to the plane of FIG. 1) and a Z-axis direction (the left-right direction in FIG. 1) on the movable gantry 4. ) And the movable column 5
A plurality of spindles 6 are independently movable in the Y-axis direction (vertical direction in FIG. 1) along the axis, and a tool is attached to the tip of the spindle 6 during machining.

When changing the type of the work W, the switching holders 7, 7 are mounted in place of the tool at the tip of the spindles 6, 6, and the work clamp position is adjusted in the procedure described later.

The jig base unit 2 includes a gate-shaped jig column 10 erected on a base 8, and a rotating body rotatably provided around a vertical axis in the gate type of the jig column 10. 11 and
A turning motor 12 for rotating the rotating body 11;
In the case of the embodiment, as shown in FIG. 3, two sets of the rotating body 11 and the turning motor 12 are provided in parallel.

As shown in FIGS. 2 and 3, the rotating body 11 is provided on a jig base 9 integrated with the base 8 and has a vertical jig plate 13; Work W on 13
And a clamp arm 15 of the clamp unit 14 protrudes from the front surface of the jig plate 13.

Next, details of the configuration around the jig plate 13 will be described with reference to FIGS. FIG. 4 is a front view of the jig plate, FIGS. 5 and 6 are partially cutaway side views, and FIG. 7 is a back view of the jig plate.

The work W is positioned and clamped on the front surface of the jig plate 13. As shown in FIGS. 4 and 5, a plurality of work reference seats 16 are provided on the front surface of the jig plate 13.
Are provided, and positioning knock pins 17 are provided at two upper and lower positions so as to be able to protrude and retract.

That is, the knock pin 17 is attached to the jig plate 1.
A pair of guide sleeves 18 fixed to the jig 3 are slidably inserted, and a connecting plate 20 for vertically connecting the two knock pins 17, 17 is attached to the extension end of the jig plate 13 on the back side. At the center of the connecting plate 20, a positioning cylinder unit 2 fixed to the back surface of the jig plate 13 is provided.
One rod is connected.

Therefore, the positioning cylinder unit 2
By the operation of 1, the upper and lower knock pins 17, 17 project forward from the jig plate 13 (upper half in FIG. 5) or retreat backward (lower half in FIG. 5).

On the back surface of the jig plate 13, vertically arranged guide members 22 as shown in FIG.
Between the upper and left guide members 22 and between the lower left and right guide members 22, respective slide plates 23 are slidably provided vertically. As shown in FIG. 5, the slide plate 23 is provided with a vertically long floating hole 23a through which the guide sleeve 18 is inserted, and the clamp unit 14 is attached thereto.

As shown in FIG. 5, the clamp unit 14 includes a pair of upper and lower clamp cylinders 24 fixed to the respective slide plates 23 and extending forward through the vertically long holes 13a of the jig plate 13. , This clamp cylinder 24
Of each cylinder rod 25 which moves forward and backward by the operation of
And a clamp arm 15 attached to the tip of the cylinder rod 25, and a detection portion 27 corresponding to a position sensor 26 attached to the slide plate 23 is provided at the rear end of the cylinder rod 25.

Incidentally, each slide plate 23 is provided with an engagement hole 28 as shown in FIG. The engagement hole 28 is adapted to allow the switching holder 7 of the processing unit 1 to be inserted therein, and has a horizontally elongated hole.

Next, a positioning mechanism of the slide plate 23 will be described with reference to FIG. FIG. 8 is an enlarged sectional view of a part of FIG.

The slide plate 23 is provided with positioning pins 30 in a direction orthogonal to the slide direction.

That is, as shown in FIG.
The positioning pin 30 is inserted into the pin hole provided in the third member 3, and the positioning pin 30 is urged by a spring 32 supported by a spring seat 31. 33 are provided.

Then, the tip of the positioning pin 30 is fitted into the positioning hole 33 to position and fix the slide plate 23. In the embodiment, two slide plates 23 are provided for each of two types of works W. Two positioning holes 33 are provided.

Further, on the outer periphery of the positioning pin 30,
A holder engaging groove 30a cut in a substantially V shape in the circumferential direction is formed.

The holder engaging groove 30a faces one end of the horizontally long engaging hole 28 formed in the slide plate 23 in a state where the positioning pin 30 is fitted in the positioning hole 33. The direction of the one end is the front side of the biasing direction of the positioning pin 30.

For this reason, the switching holder 7 is engaged from the rear side of the jig plate 13 as shown in FIG. The holder engaging groove 30a of the positioning pin 30 in the hole 28
If it is inserted into the side where there is, the switching holder 7 and the holder engagement groove 3
When the spindle 6 (switching holder 7) is horizontally moved toward the other side of the engagement hole 28, the positioning pin 30 is moved together and its tip is pulled out from the positioning hole 33. . If the spindle 6 (switching holder 7) is moved up and down after the positioning pin 30 is extracted, the slide plate 23 moves together.

As described above, the width of the engaging hole 28 is set to be equal to or longer than the length at which the positioning hole 28 and the tip of the positioning pin 30 are fitted.

The outer periphery of the lower part of the rotating body 11 is shown in FIG.
An annular groove 11a as shown in FIG.
a is clamped by three clamping mechanisms 34 (FIGS. 9 and 10).

That is, this clamping mechanism 34 is
As shown in FIG. 5, a pressing rod 36 provided on the jig table 9 and urged by a spring member 35, and a clamper 38 swingable around a horizontal axis 37 attached to the jig table 9 side are provided.
By pressing the lower part of the clamper 38 with the pressing rod 36, the tip of the clamper 38 is pressed against the lower surface of the annular groove 11a to be clamped.

When the clamp is released, the pressing rod 36 is moved in a direction in which the pressing is loosened, so that the pressing force against the lower surface of the annular groove 11a at the tip of the clamper 38 is weakened, and the rotating body 11 is rotated. In FIG. 6, reference numeral 9a denotes a base shaft for bearing the rotating body 11.

The operation of the clamp device configured as described above will be described.

When processing the work W, the work W to be handled
When the type is changed and the work shape is changed, the position of the clamp arm 15 of the jig base unit 2 needs to be changed accordingly. At the same time, the processing position also changes, so the position of the spindle 6 of the processing unit 1 must also be changed.

Therefore, when changing the type of the work W, the rotating body 11 of the jig base unit 2 is rotated by 180 degrees, and the front surface of the jig plate 13 which has been facing the processing unit 1 until then is changed. 1 in the opposite direction, and the rear surface of the jig plate 13 faces the processing unit 1 as shown in FIG. At the same time, the tool at the tip of the spindle 6 is removed, and the switching holder 7 is mounted instead.

Then, the processing unit 1 is driven in three axial directions, and the respective switching holders 7 are inserted into the respective slide plates 23 near one end of the engagement holes 28 as shown in FIG. For this reason, this switching holder 28 is
Also engages with the holder engaging groove 30a.

When the switching holder 7 is horizontally moved toward the other end of the engaging hole 28, the positioning pin 30
Moves in the direction of contracting the spring 32, and the tip comes out of the positioning hole 33. That is, the positioning and fixing of the slide plate 23 is released.

When the switching holder 7 moves a predetermined stroke horizontally, it moves a predetermined stroke in the vertical direction. The predetermined stroke in the vertical direction corresponds to the work W
It is set according to the shape.
The interval of 3 is formed according to the stroke difference.

Therefore, when the switching holder 7 moves in the vertical direction, the slide plate 23 also moves in accordance with the movement, and when the movement is completed, the switching holder 7 retreats and is pulled out from the engagement hole 28. For this reason, the positioning pin 30 is pushed by the spring 32, and its tip enters a new positioning hole 33, and the slide plate 23 is fixed.

Accordingly, the position of the clamp unit 14 integral with the slide plate 23 is also changed, so that a new work W can be clamped.

When the work W is set on the work reference seat 16 on the front surface of the jig plate 13, the knock pin 17 is projected to engage with the knock hole of the work W, and the clamp cylinder 24 is operated to operate the clamp arm 15. Is used to clamp the work W. The position of the knock hole of the work W does not change depending on the type of the work.

When the workpiece is clamped, the rotating body 11 is rotated by 180 degrees by the turning motor 12, and
As shown in FIG.
Face to face.

[0040]

As described above, in the work clamping apparatus of the present invention, the position of the clamp arm of the jig base unit is adjusted by using the driving means for adjusting the position of the spindle of the processing unit. Therefore, there is no need to provide a driving means for position adjustment in the jig base unit, and the apparatus can be simply configured. Further, in order to position and fix the slide plate integrated with the clamp arm, a positioning pin provided on the slide plate and a positioning hole provided on the guide member are engaged with each other. Utilization can further simplify the device. By engaging the switching holder at the tip of the spindle and moving and adjusting the clamp position and the like,
Quick and accurate response to model change.

[Brief description of the drawings]

FIG. 1 is a side view of the entire apparatus.

FIG. 2 is a side view of the jig stand unit.

FIG. 3 is a front view of the same.

FIG. 4 is a front view of a jig plate.

FIG. 5 is a side view with a part broken away.

FIG. 6 is a side view showing the same broken portion.

FIG. 7 is a rear view of the jig plate.

FIG. 8 is an enlarged cross-sectional view of a part of FIG. 7;

FIG. 9 is a plan view partially in section.

FIG. 10 is a plan view in which the cross section is changed.

FIG. 11 is a partially enlarged view of FIG. 10;

FIG. 12 is a side view of a state during processing.

[Explanation of symbols]

 Reference Signs List 1 processing unit 2 jig stand unit 6 spindle 7 switching holder 13 jig plate 14 clamp unit 15 clamp arm 22 guide member 23 slide plate 28 engagement hole 30 positioning pin 30a holder engagement groove 33 positioning hole

Claims (3)

(57) [Claims] 1. A jig stand unit is disposed in front of a processing unit having a position-adjustable spindle, and a jig plate rotatable around a vertical axis is provided on the jig stand unit. In a work clamping apparatus configured to clamp a work, a guide member is fixed to a rear surface side of the jig plate, and a slide plate that is slidable along the guide member is provided, and is configured integrally with the slide plate. The clamp arm of the clamp unit is projected forward and backward toward the front side of the jig plate, and an engagement hole is formed in the rear surface of the slide plate. And a slide plate is moved in accordance with the movement of the spindle to adjust the position of the clamp arm. 2. A plurality of positioning holes are provided in the guide member along a sliding direction of the slide member, and a positioning pin is provided on the slide plate so as to be movable forward and backward in a direction perpendicular to the sliding direction. 2. An engaging groove is formed on an outer periphery of a pin, and the holder is engaged with the engaging groove to move a spindle so that the positioning pin and the positioning hole can be engaged and disengaged. 2. The work clamping device according to claim 1. 3. The work clamping apparatus according to claim 2, wherein an engaging groove of the positioning pin is made to face an engaging hole of the slide plate.