JPH0541687U - Air check - Google Patents

Abstract

(57) [Summary] [Purpose] To maintain and improve the service life and chuck accuracy. [Structure] An adjustment screw 13 is provided on the housing 2 side corresponding to the other end side of the piston 16 so that the piston 16 can be moved back and forth toward the side to which the piston 16 is moved.
The other end of the piston 16 is brought into contact with the tip of the piston 16
6 is regulated, and at the same time, the opening / closing movement amount of the finger 23 is adjusted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air chuck for a robot to grab a part or the like in an automated production line, for example.

[0002]

[Prior Art]

 3 and 4 show an example of a conventional air chuck, FIG. 3 is a schematic sectional view thereof, and FIG. 4 is a side view thereof. 3 and 4, the air chuck 101 includes a housing 102, a first piston 103 and a second piston 104 slidably mounted in a cylinder cylinder 114 of the housing 102, and a first piston 103. A pair of link arms 106, which are linked to the lower end via a support shaft 105, and a pair of fingers 108, etc., which are linked to the other end of each link arm 106 via a support shaft 107. It is configured. The upper surface of the cylinder cylinder 114 is closed by a cap 111, and a roller 110 is attached to a part of each link arm 106 via a support shaft 109. Each roller 110 attached to each link arm 106 is in contact with the lower end arm 104a of the second piston 104.

Further, in the air chuck 101, a pair of air inflow / outflow holes 112 and 113 communicating with the inside of the cylinder cylinder 114 are provided on the side surface of the housing 102. In addition, pipes (not shown) are attached to these air inflow / outflow holes 112 and 113, and the pipes are connected to an air compressor (not shown).

Further, air is alternately supplied to the pair of air inflow / outflow holes 112 and 113 from an air compressor by the control of an opening / closing valve in the middle. When the air is supplied from the air inflow / outflow hole 112, the first piston 103 is moved in the cylinder cylinder 114 in the direction of arrow A in FIG. Then, the roller 110 is pushed by the lower surface of the lower end arm 104a of the second piston 104, and the link arm 106 rotates in the direction of arrow C in FIG. 3 while sliding on the lower surface of the lower end arm 104a. Further, due to this rotation operation, the finger 108 receives a force that moves in the direction of arrow E in FIG. 3, and this force causes each finger 108 to move in the direction of arrow E and closes. The amount of movement at this time is regulated by the adjustment screw 116 protruding from one finger 108 coming into contact with the other finger 108. In addition, an attachment 117 is detachably attached to each finger 108 with a screw 119 as shown by a dashed line in the figure, and a component 118 is attached via the attachment 117 during the closing operation. Hold it.

On the other hand, when the air in the air inflow / outflow hole 112 is stopped and air is supplied from the air inflow / outflow hole 113, the first piston 103 and the second piston 104 move inside the cylinder cylinder 114. Is moved in the direction of arrow B in FIG. Then, the link arm 106 rotates in the direction of arrow D in FIG. Further, due to this rotation operation, the finger 108 receives a force that moves in the direction of arrow F in FIG. 3, and this force causes each finger 108 to move in the direction of arrow F and opens.

[0006]

[Problems to be solved by the device]

 However, as described above, in the conventional air chuck structure, the stroke amount of the first and second pistons 103 and 104 on the closing operation side is regulated by the contact of the adjusting screw 116 provided between the fingers 108. .. Therefore, various members such as the link arm 106 and the support shafts 105 and 107 are interposed until the driving force of the pistons 103 and 104 is regulated. Therefore, these members are regulated respectively. The driving force during control will be applied directly. Therefore, the load on each member becomes large, and especially the link arm 106, the bearing 120 (see FIG. 3) interposed between the fingers 108 and the housing 102, is worn out and the life is shortened, and the chuck is shortened. There were problems such as poor repeatability of operations. Further, since the adjusting screw 116 is attached to the finger 108, there is a problem that it is difficult to design the attachment 117 attached to the finger 108.

The present invention has been made in view of the above problems, and an object thereof is to provide an air chuck having a structure capable of maintaining and improving the life and the accuracy of the chuck.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a housing, a piston that reciprocates in the housing, a piston attached to one end of the piston via a link, and opens and closes in conjunction with the movement of the piston. A pair of fingers configured to move the piston by air blown into the housing. In the air chuck, the piston is moved to the housing side corresponding to the other end side of the piston. An adjustment screw that can be adjusted to move forward and backward toward the side is provided, and the other end of the piston is brought into contact with the tip of the adjustment screw to regulate the movement amount of the piston.

[0009]

[Action]

 With this configuration, when the protrusion amount of the adjusting screw is changed, the movement amount of the piston can be directly controlled, and at the same time, the opening / closing movement amount of the finger can be adjusted. That is, since the piston is brought into direct contact with the protruding end of the adjusting screw to regulate the movement amount, the force of the piston at the time of this regulation is applied only to the adjusting screw side and not to the finger side. Therefore, since only the minimum force required for opening and closing the chuck is applied to the fingers, mechanical fatigue of each mechanical component can be reduced. Also, because the adjustment screws used in the conventional structure are not required on the finger side, the structure for attaching attachments etc. to the finger can be simplified, which simplifies the design and makes the structure compact and lightweight. Can be realized.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show an embodiment of an air chuck according to the present invention. FIG. 1 is a schematic sectional view thereof, and FIG. 2 is a side view thereof.

1 and 2, the air chuck 1 is formed with a housing 2 as a base.

More specifically, the housing 2 is formed in the shape of a substantially flat block piece, and the cylinder tube 3 is formed in the inside thereof so as to penetrate vertically. Further, a slit portion 4 is formed on the lower end side of the housing 2 on both left and right sides. In addition, guide rails 5 are fixedly attached to the lower end surfaces of the housing 2 on both front and rear sides with the slit portion 4 interposed therebetween by using screws (not shown). V-grooves 7 in which ball bearings 6 are mounted are formed on the inner surfaces of the guide rails 5 which face each other.

Further, a pair of air inflow / outflow holes 8 and 9 communicating with the inside of the cylinder 3 are provided on the side surface of the housing 2, and a pipe (not shown) can be attached to these air inflow / outflow holes 8 and 9. The air can be supplied from an air compressor (not shown) through this pipe.

Further, the upper portion of the cylinder tube 3 is closed by a cap 10. The cap 10 is attached in a sealed state with a seal packing 11 interposed between the cap 10 and the inner surface of the cylinder tube 3, and after attachment, is fixed by a snap ring 12 so as not to come off. In addition, the cap 10 is formed with a vertically penetrating hole 14 through which the adjusting screw 13 is inserted, and a weld nut 15 is concentrically attached to the hole 14 on the upper surface thereof. The adjusting screw 13 screwed into the weld nut 15 is passed through the hole 14. The amount by which the adjusting screw 13 projects from the lower surface of the cap 10 into the cylinder tube 3 can be adjusted by rotating the adjusting screw 13 from the outside of the upper surface of the cap 10 and changing the screwing amount. At this time, the adjustment screw 13 is moved along the center line of the cylinder cylinder 3 in the direction of arrow AB in FIG.

On the other hand, in the cylinder tube 3 of the housing 2, a piston 16 is slidably mounted from the lower end side of the housing 2. The piston 16 is composed of a first piston 17 and a second piston 18 which is attached so as to partially overlap with the first piston 17, and between the pistons 17 and 18 and between the pistons 17 and 18 and the cylinder. A seal packing 19 is attached and sealed between the inner surface of the cylinder 3 and the inner surface of the cylinder 3.

Further, of the first piston 17 and the second piston 18, a lower end arm portion 18 a is formed at a lower end of the second piston 18 so as to extend outward in the slit portion 4. On the other hand, the lower end of the first piston 17 has a pair of link arms 21 linked to each other via a support shaft 20, and the other ends of the link arms 21 are linked to each other via a support shaft 22. A pair of fingers 23 thus formed are attached. A recess 24 is provided at the upper end of the piston 17, and a damper 25 is mounted in the recess 24 in correspondence with the adjusting screw 13. Further, a roller 27 is attached to a part of the pair of link arms 21 via a support shaft 26, and the roller 27 is in contact with the lower end arm 18 a of the second piston 18. On the other hand, the fingers 23 are disposed in contact with each other between the guide rails 5 via the ball bearings 6 and are movable in the arrow E-F direction in FIG. Further, an attachment 29 for holding the component 28 is detachably attachable to the tip end side of each finger 23 via a screw 30.

Next, the operation of the air chuck 1 will be described. In this air chuck 1, when the air is supplied from the air inlet / outlet hole 8, the closing operation is performed, and conversely, when the air is supplied from the air inlet / outlet hole 9, the opening operation is performed. Opening and closing operations are alternately performed by control.

Therefore, first, a case where air is supplied from the air inflow / outflow hole 8 will be described. When air is supplied from the air inflow / outflow hole 8, the first piston 17 is moved in the cylinder cylinder 3 by an arrow A in FIG. Is moved in the direction. Then, the roller 27 is pushed by the lower surface of the lower end arm 18a of the second piston 18, and the link arm 21 rotates in the direction of arrow C in FIG. 1 while sliding on the lower surface of the lower end arm 18a. Also, due to this rotation operation, the finger 23 receives a force to move in the direction of arrow E in FIG. 1, and this finger moves each finger 23 in the direction of arrow E to close it. The movement at this time is possible until the upper end of the first piston 17 comes into contact with the adjusting screw 13 via the damper 25 and is regulated. When the amount of protrusion of the adjusting screw 13 into the cylinder tube 3 is increased, the stroke amount of the first piston 17 is decreased. Conversely, when the amount of protrusion of the adjusting screw 13 is decreased, the stroke amount of the first piston 17 is decreased. As is said to increase, the movement amount of the finger 23 can be adjusted by switching the stroke. 1 and 2 show a state in which the finger 23 is thus closed and the component 28 is chucked.

On the other hand, when air is supplied from the air inlet / outlet hole 9, the first piston 17 and the second piston 18 are moved in the cylinder cylinder 3 in the direction of arrow B in FIG. Then, the link arm 21 rotates in the direction of arrow D in FIG. Also, due to this rotation operation, the fingers 23 receive a force to move in the direction of arrow F in FIG. 1, and this force causes each finger 23 to move in the direction of arrow F to open. As a result, the component 28 sandwiched between the attachments 29 is released.

That is, according to the air chuck 1 of this embodiment, by alternately opening and closing the pair of fingers 23 in this manner, a predetermined component 28 is grasped and released again. It can be repeated. Then, by changing the protruding amount of the adjusting screw 13, the moving amount of the piston 16 (first piston 17) can be directly controlled, and at the same time, the closing moving amount of the finger 23 can be adjusted.

In the structure of the above-mentioned embodiment, the structure in which the piston 16 is composed of two pistons, that is, the first piston 17 and the second piston 18, is disclosed, but it may be composed of one piston. is there. Further, although the structure for restricting the movement of the piston 16 is disclosed when the piston 16 moves to the side where the finger 23 is closed, the restriction is provided when the finger 23 moves to the side where the finger 23 is opened. It is good.

[0022]

[Effect of the device]

 As described above, according to the air chuck of the present invention, the piston is brought into direct contact with the projecting end of the adjusting screw to regulate the movement amount. Side only, not the finger side. As a result, the minimum force required to open and close the chuck is applied to the fingers, which reduces mechanical fatigue of each mechanical component and prolongs its service life. Accuracy is also improved. Also, because the adjustment screws used in the conventional structure are not required on the finger side, the structure for attaching attachments etc. to the finger can be simplified, which simplifies the design and makes the structure compact and lightweight. It can be achieved. Furthermore, by making the air chuck itself smaller and lighter, the inertia when it is attached to, for example, a robot is reduced, and the positioning accuracy during high-speed operation of the robot is also improved.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an air chuck according to an embodiment of the present invention.

FIG. 2 is a side view of the above air chuck shown in FIG.

FIG. 3 is a schematic sectional view showing an example of a conventional air chuck.

FIG. 4 is a side view of the air chuck shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Air chuck 2 ... Housing 3 ... Cylinder cylinder 13 ... Adjusting screw 16 ... Piston 23 ... Finger 28 ... Parts 29 ... Attachment

Claims (1)

[Scope of utility model registration request] 1. A housing, a piston that reciprocates in the housing, and a pair of fingers that are attached to one end of the piston via a link and that are opened and closed in conjunction with the movement of the piston. And an air chuck for moving the piston by air blown into the housing, wherein the housing side is provided corresponding to the other end side of the piston,
The piston is provided with an adjusting screw that can be moved forward and backward toward the moving side, and the other end side of the piston is brought into contact with the tip of the adjusting screw to regulate the moving amount of the piston. An air chuck characterized by.