JP2640614B2 - Clamping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
The present invention relates to a clamp device for performing predetermined processing such as cleaning and painting on the workpiece.

[0002]

2. Description of the Related Art Conventionally, a clamp device for gripping a workpiece and performing predetermined processing such as cleaning and painting on the workpiece is disclosed in Japanese Utility Model Publication No. 57-55032, for example. There is a clamp device used in a workpiece transfer device. Hereinafter, this clamp device will be briefly described.

This clamping device is provided with an annular plate member that rotates in a vertical plane between processing stations for performing processing such as cleaning and painting, and is provided at four locations on an outer peripheral surface of the annular plate member at equal angles. A notch is formed at the position of the notch, a work stopper is disposed on a ceiling portion (rotation center side) of the notch, and a U-shaped frame surrounding the notch is moved in the direction of the rotation center of the annular plate member. The U-shaped frame is always slidably biased in the direction of the center of rotation of the annular plate member, and the U-shaped frame has positioning pins at the ends of both legs. A workpiece mounting member is provided, and a cam groove for engaging a cam roller for lowering the U-shaped frame is provided in the horizontal girder portion of the U-shaped frame, and further, between the workpiece mounting members. Raise and advance the caliper on which the workpiece is placed below the formed gap.
It is arranged so as to be able to descend and retreat.

[0004] Then, when performing the processing, first,
The cam roller engaged with the cam groove is lowered to widen the gap between the workpiece mounting member provided at the end of each foot rod and the work stopper provided at the ceiling, and the workpiece mounted on the caliper The workpiece is placed on the workpiece placing member, positioned by the positioning pin, and then the cam roller is raised to release the downward pressing force of the U-shaped frame. It is to be sandwiched and fixed between the workpiece mounting member.

[0005] However, in such a conventional technique, a clamp device for placing, positioning, clamping and fixing a workpiece is provided in four notches formed in an annular plate member. Since the U-shaped frame and the cam groove and the like are provided in the horizontal girder portion of the U-shaped frame and are engaged with a cam roller that presses the U-shaped frame, the structure of the clamp device becomes complicated, Further, there has been a problem that the maintenance work becomes considerably difficult and the production cost increases.

There is another problem that the posture of the workpiece cannot be changed while the workpiece is being gripped. If the posture of the workpiece cannot be changed in this way, for example, when cleaning the workpiece, the workpiece is transported to several locations and distributed with a predetermined purpose in each location. The cleaning liquid must be ejected from a large number of cleaning nozzles to clean the workpiece, which complicates the interior of the cleaning chamber, makes maintenance work difficult, and increases the manufacturing cost of the cleaning chamber. Was.

Therefore, a clamp device in which these are improved has already been proposed and filed by the present applicant (Japanese Patent Application No. 4-336601). This clamping device is shown in FIG.
As shown in FIG. 7, a rotatable frame 73 is rotatably provided on a main frame 72 of the clamp device main body 71, and a casing 74 fixed to the rotatable frame 73 is provided on the rotatable frame 73.
(See FIG. 8), a sliding shaft 75 slidably fitted to the casing 74, a clamp member 76 attached to one end of the sliding shaft 75, and a base end of the sliding shaft 75. A clamping unit 79 comprising a resilient urging means 77 which is always biased to the side and a workpiece receiver 78 fixed to the base end side of the casing 74 is provided, and a base end of a sliding shaft 75 of the clamp unit 79 is provided. This is provided with a pressing means 81 for pressing the pressing portion 80 of the clamping device.

When a workpiece is clamped by the clamp device, the pressing means 81 presses the pressing portion of the clamp device.
When pressing 80, the sliding shaft 75 slides in the casing 74 against the resilient urging means 77 to push up the clamp member 76 to bring it to the unclamped state. In this state, when the workpiece is placed on the workpiece receiver 78 and the pressing by the pressing means 81 is released, the workpiece is sandwiched and clamped by the workpiece receiver 78 and the clamp member 76. Will be.

When the clamped workpiece is to be cleaned, the workpiece is immersed in a cleaning liquid in a high-pressure cleaning tank 82,
While rotating the workpiece, a high-pressure cleaning nozzle (not shown) provided inside the cleaning liquid ejects the high-pressure cleaning liquid to agitate the cleaning liquid to clean the workpiece.

[0010]

In the prior art described above, a workpiece is clamped by a workpiece receiver urged by an elastic urging means and a clamp member, and the workpiece is clamped in this clamped state. The workpiece was washed by immersing it in a high-pressure cleaning tank and spraying a cleaning liquid from a high-pressure cleaning nozzle while rotating the workpiece. When the pressing unit was rotated together with the object and the pressing unit came near the high-pressure cleaning nozzle, the pressing unit was pressed by the pressure of the cleaning liquid from the high-pressure cleaning nozzle.

Therefore, when the liquid pressure of the cleaning liquid from the high-pressure cleaning nozzle is smaller than the resilience of the resilient urging means, good cleaning can be performed. When cleaning the workpiece, a stronger pressure of the cleaning liquid is applied to the pressing portion of the clamp device. When such a strong hydraulic pressure is applied to the pressing portion, the elasticity of the elastic urging means is naturally limited, so the clamp member is pushed up against the elasticity of the elastic urging means, There was a risk that the workpiece would shift. Further, when the pressure of the cleaning liquid is stronger, there is a problem that the workpiece drops.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has a very simple structure, and furthermore, the clamp member is unlocked regardless of any strong liquid pressure applied to the pressing portion of the clamp device. It is an object to provide a clamping device that does not clamp.

[0013]

According to the present invention, as a means for solving the above-mentioned problems, a clamp unit is provided rotatably on a main body frame of a clamp device main body, and a rotating substrate which is laterally opposed to the clamp unit. A lower plate having a guide plate formed with a long guide hole in a direction substantially perpendicular to the rotation axis of the rotary substrate, and a workpiece receiver provided at a tip end. A pair of guides, each having an arm fixed thereto, and an upper clamp arm having a clamp member provided at a tip end thereof rotatably mounted on the rotary substrate, and slidably engaged with a long guide hole of the guide plate. A movable member having a member mounted thereon is provided, a copying arm is fixed to an end of the movable member, and the movable member and the upper clamp arm are rotatably connected to each other by a link, and the copying arm is always upward. Providing a resilient biasing means for resiliently urging,
The scanning disk is fixed to the body frame so that the axis of rotation of the rotating substrate and the center of the circle are on the same axis, and the outer peripheral surface is engaged with the copying arm. The copying arm is attached to the outer periphery of the copying disk. A relief groove is formed to allow the copying arm to move when pressed when it is at a predetermined position.

[0014]

The present invention has been configured as described above.
When placing a workpiece on the workpiece receiver, pressing the copying arm at a predetermined position lowers the copying arm along the relief groove of the copying disk. The pressing force is transmitted to a pair of guide members fitted in the long guide hole of the guide plate via the movable member, and the pair of guide members is guided by the long guide hole of the guide plate. And the movable member also descends, and the copying arm also descends horizontally against the elastic force of the elastic urging means.

When the movable member descends, the movable member and the upper clamp arm are connected by the link, and the upper clamp arm is pulled by the link and rotates in the opening direction. This operation is continued until one of the pair of guide members comes into contact with the lower end of the guide hole. Then, when the guide member contacts the lower end of the guide hole, the upper clamp arm is opened.

When the workpiece is placed on the workpiece receiver of the lower clamp arm and the pressing force of the copying arm is released, the copying arm is pushed up by the elastic force of the elastic urging means, and the movable member is also moved. The upper clamp arm is pushed up by the link and is rotated by the link in the closing direction. When one of the pair of guide members abuts on the upper end of the guide hole, the upper clamp arm is closed. That is, the workpiece is firmly clamped to the clamp device body.

Thus, the clamp device main body is immersed in the cleaning liquid in the cleaning tank together with the workpiece while maintaining a fixed posture, and the high pressure cleaning nozzle provided in the cleaning tank is rotated while rotating the clamp unit. The cleaning liquid is jetted to stir the cleaning liquid, thereby cleaning the workpiece.

When the clamp unit is rotated, the copying arm rotates while being engaged with the outer peripheral surface of the copying disk. Therefore, even if a strong pressing force is applied to the copying arm during the rotary cleaning of the workpiece, The pressing force is received on the outer peripheral surface of the copying disk, is not transmitted to the movable member, and the workpiece is cleaned while being firmly clamped.

When the predetermined cleaning step is completed, the main body of the clamp device is raised, and the main body of the clamp device returns to the original position.

When the clamp device body returns to the original position,
Press the copying arm again to open the upper clamp arm. When the upper clamp arm is unclamped in this way, the workpiece is removed from the clamp device main body, and one cleaning step is completed.

[0021]

Next, an embodiment of the present invention will be described with reference to FIGS. In the drawings, reference numeral 1 denotes a clamp device main body, reference numeral 2 denotes a main body frame provided on the clamp device main body 1 in a horizontal state, and reference numeral 3 denotes a clamp unit rotatably provided on the main body frame 2.

Reference numeral 4 denotes a rotating board provided so as to face the clamp unit 3 in the lateral direction. A rotating shaft 5 is fixed to the center of rotation of the rotating board 4, and the rotating shaft 5 is fixed to the main body frame 2. The bearing 6 is rotatably supported by the bearing 6.

Reference numeral 7 denotes a bearing retainer for attaching the bearing 6 to the main body frame 2, and reference numeral 8 denotes a guide plate fixed to the opposing surface of the rotating substrate 4. A long guide hole 9 is formed in the guide plate 8 in a direction substantially perpendicular to the rotation axis of the rotary substrate 4.

Reference numeral 10 denotes a mount bracket disposed on the left and right sides of the guide plate 8 and fixed to the rotating board 4.
Reference numeral 11 denotes a lower clamp arm fixed to the lower surface of the mount bracket 10, and a workpiece receiver 12 is fixed to a distal end of the lower clamp arm 11.

Reference numeral 13 denotes an upper clamp arm rotatably mounted at an appropriate position on the mount bracket 10 by a hinge pin 14, and a clamper 15 serving as a clamp member is fixed to a distal end of the upper clamp arm 13.

Reference numeral 16 denotes a movable bracket which is a movable member provided so as to sandwich the guide plate 8.
A guide roller, which is a pair of guide members slidably fitted in a long guide hole 9 of the guide plate 8, that is, an upper guide roller 17 and a lower guide roller 18 are hinge pins.
It is rotatably mounted by 19 and 20.

Therefore, the movable bracket 16 moves up and down almost vertically by sliding the upper guide roller 17 and the lower guide roller 18 through the long guide hole 9 of the guide plate 8.

Reference numeral 21 denotes a copying arm fixed to the upper part of the movable bracket 16. A guide hole 22 is formed in the copying arm 21 on the upper clamp arm 13 side. The upper surface of the copying arm 21 is a pressing portion 21 '.

Reference numeral 23 denotes a support bracket fixed in place on the guide plate 8. The base end of a spring holding rod 24 slidably fitted into the guide hole 22 of the copying arm 21 is fixed to the support bracket 23. Also, the sign
Reference numeral 25 denotes a spring, which is a resilient urging means interposed between the copying arm 21 and the support bracket 23 so as to always resiliently urge the copying arm 21 upward, which is held by a spring holding rod 24. I have.

Reference numeral 26 denotes a link connecting the movable bracket 16 and the upper clamp arm 13. The link 26 is rotatably connected to the movable bracket 16 by a hinge pin 19, and is rotatably connected to an intermediate portion of the upper clamp arm 13 by a hinge pin 27.

Therefore, when the pressing portion 21 ′ of the copying arm 21 is pressed, the pressing force is applied to the pair of guide rollers 17, 18 fitted in the long guide holes 9 of the guide plate 8 via the movable bracket 16. And a pair of guide rollers 17, 18
Is guided by the long guide hole 9 of the guide plate 8 and descends.
The movable bracket 16 also descends, and the copying arm 21 also springs
Descends horizontally against the resilience of 25.

As the movable bracket 16 descends,
Link 26 between movable bracket 16 and upper clamp arm 13
Upper clamp arm 13
It is pulled by 26 and pivots in the opening direction.

In this operation, the lower guide roller 18 of the pair of guide rollers 17, 18 is connected to the long guide hole 9 of the guide plate 8.
Until the lower guide roller 18
Is locked at the lower end of the guide hole 9, the upper clamp arm 13 is opened.

On the contrary, the pressing portion 21 'of the copying arm 21
When the pressing force is released, the copying arm 21 is pushed up by the elastic force of the spring 25, and the movable bracket 16 and the pair of guide rollers 17, 18 are also raised, so that the pair of guide rollers 1
When the upper guide rollers 17 of 7 and 18 are locked at the upper ends of the guide holes 9, the upper clamp arm 13 is closed. That is, the workpiece W is clamped (see FIG. 1).

Reference numeral 28 denotes both rotating substrates 4 so that the rotating substrates 4 provided facing the clamp unit 3 rotate synchronously.
Are shown in the figure. Reference numeral 29 denotes a copying disk fixed to the body frame 2 such that the center of the circle is on the same axis as the axis of the rotation center of the rotating substrate 4 of the clamp unit 3 and the copying arm 21 is engaged with the outer peripheral surface.

A relief groove 30 is formed on the outer periphery of the copying disk 29 to allow the copying arm 21 to move when the copying arm 21 is pressed and lowered. Reference numeral 31 designates a connection fitting fixed to both sides of the rotary shaft 5 of the rotary substrate 4, and the connection fitting 31 has a guide groove 32 which engages with a guide rail S2 provided in the cleaning tank S1.
Are formed. The guide rail S2 extends to a predetermined position in the cleaning tank S1.

Reference numeral S3 denotes a cleaning solution provided in the cleaning tank S1, reference numeral S4 denotes an elevating device connected to the main body frame 2 of the clamp device main body 1, and elevating device S4 denotes the clamp device main body 1 When clamping, the clamp device body 1
Is immersed together with the workpiece W in the cleaning liquid S3 of the cleaning tank S1.

Next, the operation of this embodiment will be described. First,
As shown in FIG. 1, the clamp device main body 1 is supported by the elevating device S4 and is at the original position. Then, when the pressing portion 21 ′ of the copying arm 21 is pressed by pressing means (not shown), the pressing force is applied to the upper guide roller 17 fitted in the long guide hole 9 of the guide plate 8 via the movable bracket 16. And a pair of guide rollers 18
17 and 18 are guided by the long guide hole 9 of the guide plate 8 and descend, the movable bracket 16 also descends, and the copying arm 21 also releases the relief groove 30 of the copying disk 29 against the elastic force of the spring 25. Descends horizontally through.

As the movable bracket 16 descends,
Link 26 between movable bracket 16 and upper clamp arm 13
Upper clamp arm 13
It is pulled by 26 and pivots in the opening direction. This operation is continued until the lower guide roller 18 of the pair of guide rollers 17 and 18 is locked at the lower end of the elongated guide hole 9 of the guide plate 8. When locked at the lower end of the hole 9, the upper clamp arm 13 is in the open state.

Next, the workpiece W is moved to the lower clamp arm 11.
Of the copying arm 21
When the pressing force is released, the copying arm 21 is pushed up by the elastic force of the spring 25, and the movable bracket 16 is also pushed up.
And is rotated in the closing direction by a pair of guide rollers 1.
When the upper guide rollers 17 of 7 and 18 are locked at the upper ends of the elongated guide holes 9 of the guide plate 8, the upper clamp arm 13 is closed. That is, the workpiece W is the clamp device main body 1
Firmly clamped. At this time, the copying arm 21 can be engaged with the outer peripheral surface of the copying disk 29.

When the workpiece W is clamped by the clamp device main body 1, the lifting device S4 operates, and the clamp device main body 1
Is lowered. Thereby, the clamp device main body 1 is guided by the guide rail S2, and is immersed in the cleaning liquid S3 of the cleaning tank S1 together with the workpiece W while maintaining a constant posture.

In the cleaning tank S1, a rotary driving member (not shown) is provided at the lower end of one of the guide rails S2.
The connection fitting 31 of the clamp device main body 1 releases the engagement with the guide rail S2, and the one connection fitting of the clamp device main body 1 is released.
31 engages the rotary drive member.

At this time, the main body frame 2 is positioned and fixed by engaging one of the connecting fittings 31 with the rotary driving member and simultaneously engaging with the fixing fitting (not shown) provided in the cleaning tank S1.

The main body frame 2 is positioned in the cleaning tank S1,
When it is fixed, the operation of the lifting device S4 stops, the rotation drive member operates, and the clamp unit 3 of the clamp device body 1
Rotates, and a high-pressure cleaning liquid is ejected from a high-pressure cleaning nozzle (not shown) provided in the cleaning tank S1 so that the workpiece W
Is performed. That is, the workpiece W is immersed in the cleaning liquid S3, and is washed with the high-pressure cleaning liquid while rotating.

When the rotation drive member is operated and the clamp unit 3 of the clamp device main body 1 is rotated, the copying arm 21 is rotated.
Rotates while engaging with the outer peripheral surface of the copying disk 29,
Pressing portion 2 of copying arm 21 during rotary cleaning of workpiece W, for example
Even if a strong pressing force of the cleaning liquid is applied to 1 ', the pressing force is locked on the outer peripheral surface of the copying disk 29, is not transmitted to the movable bracket 16, and the workpiece W is firmly clamped. Washed with.

When the predetermined cleaning process is completed, the operation of the rotary drive member is stopped, the lifting device S4 is operated again, and the clamp device body 1 is raised this time. When the clamp device main body 1 rises, the engagement of the one connection fitting 31 of the clamp device main body 1 with the rotation drive member is released, and the clamp device main body 1 is released.
Is engaged with the guide rail S2. At this time, the engagement of the body frame 2 with the fixture is naturally released.

When the clamp device body 1 reaches the rising end of the guide rail S2, the operation of the lifting device S4 stops, and the clamp device body 1 stops at that position and is positioned and supported. That is, the clamp device main body 1 returns to the original position.

When the clamp device main body 1 returns to the original position, the pressing portion of the copying arm 21 is pressed by pressing means (not shown).
21 'is pressed again to open the upper clamp arm 13. In this way, when the workpiece W is unclamped, the workpiece W is removed from the clamp device main body 1 and the one cleaning process is completed.

[0049]

As described above, according to the present invention, since the copying arm provided on the clamping unit of the clamping device body rotates in a state of being engaged with the outer peripheral surface of the copying disk, during the rotation processing of the workpiece, Even if a strong pressing force due to the cleaning liquid is applied to the pressing portion of the copying arm, the pressing force is received by the outer peripheral surface of the copying disk and is not transmitted to the movable member, and the workpiece is firmly clamped. Can be washed.

Further, since no means for rotating the clamp unit is provided in the clamp device main body, the clamp device main body becomes extremely simple, and the weight of the clamp device main body can be reduced.

Further, since the clamp member for clamping and holding the workpiece is opened and closed by the spring force of the spring, the clamp device main body is provided with a cylinder or the like for opening and closing the clamp member as in the conventional case. It is not necessary to provide a special drive source, and as in the above, the clamp device main body becomes extremely simple, and the weight of the clamp device main body can be reduced.

Further, since the structure of the clamp device is extremely simple, there are many effects such as easy maintenance work and low production cost.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment according to the present invention.

FIG. 2 is a plan view of that of FIG.

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

FIG. 4 is a left side view of the one in FIG.

FIG. 5 is a right side view of the one in FIG.

FIG. 6 is a side view of a conventional one.

FIG. 7 is a top view of a conventional device.

FIG. 8 is a sectional view of a conventional clamp unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamp apparatus main body 2 Main body frame 3 Clamp unit 4 Rotating board 8 Guide plate 9 Guide hole 11 Lower clamp arm 12 Workpiece receiver 13 Upper clamp arm 15 Clamper 16 Movable bracket 17 Upper guide roller 18 Lower guide roller 21 Copy arm 25 Spring 26 Link 29 Copy disk 30 Relief groove

Claims (1)

(57) [Claims] A clamp unit is provided on a main body frame of a clamp device main body so as to be rotatable, and a rotating board opposed to the clamp unit in a lateral direction is provided.
Fixing a guide plate having a long guide hole formed in a direction substantially perpendicular to the rotation axis of the rotating substrate, and fixing a lower clamp arm provided with a workpiece receiver at the tip end,
An upper clamp arm provided with a clamp member at the tip thereof is rotatably mounted on the rotary substrate, and a pair of guide members slidably engaged with a long guide hole of the guide plate are mounted. A member is provided, a copying arm is fixed to an end of the movable member, and the movable member and the upper clamp arm are rotatably connected to each other by a link. A biasing means is provided, and a scanning disk is fixed to the main body frame so that the axis of the rotation center of the rotating substrate and the center of the circle are on the same axis, and is engaged with the scanning arm on the outer peripheral surface. A clamping device, wherein a relief groove is formed on the outer periphery to allow movement of the copying arm when the copying arm is pressed at a predetermined position.