JPH03117505A - Chuck device - Google Patents

Abstract

PURPOSE:To conduct a relative motion between a roll part and a scroll part by a rotation of a main spindle by providing a scroll chuck part for opening/ closing a gripping jaw on an end of a main spindle capable of normal/reverse rotation, and moving a stopper part for restraining the roll part of the scroll chuck part to the scroll chuck part. CONSTITUTION:When a roll part 1 having a spiral screw 1b on one face is rotated, a gripping jaw 2 of a scroll chuck part 3, having a screw engaged with the screw 1b, is moved in the radial direction along a groove 31 and the jaw 2 performs an opening/closing action. The scroll part 3 is fitted on an end of a main spindle 4 capable of normal/reverse rotation. A relative rotation between the roll part 1 and the chuck part 3 is caused by the rotation of the main spindle 4 and the gripping jaw 2 abuts on a lens 6. After the abutting, the roll part 1 and the chuck part 3 move together with the main spindle 4, a stopper gear 13 movably engaged with a gear 12 fitted on the roll part 1 is also rotated and a torsion spring 23 is displaced to form a tightening force. Even when the stopper gear 13 is separated from the roll part 1, the gripping state is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a chuck device used when gripping a cylindrical workpiece and machining the end face or outer peripheral surface of the workpiece.

[Conventional technology]

An example of the prior art will be described below with reference to FIG.

In a lens holding chuck for a lens processing machine that holds a lens that has been polished on one side with a collet chuck provided at the tip of a lens holding shaft and processes the other side of the lens, a collet part 8 that holds the lens 7 at the tip has conventionally been used. A ring 9 that is suctioned and held by a vacuum generator (not shown) and positioned in the thickness direction of the lens, a main shaft 10 that guides the collet part 8 with a taper, and a driving part (not shown) that moves the collet part 8. It consisted of a drawper part 11 that moves in the axial direction.

The lens 7 is maintained under vacuum by a vacuum generator (not shown).
It is positioned by a ring 9 in the thickness direction. A collet part 8 is connected and integrated with the drawer part 11 by a screw or the like.
is pulled up in the axial direction by the drive unit 26, and the main shaft 10
A part of the taper of the collet part 8 and a part of the taper of the collet part 8 slide and are guided to change in the radial direction, and contact and hold the outer diameter of the lens 7.

After processing, take the opposite steps to the above and! The ring 7 is separated from the ring 9 by breaking the vacuum of a vacuum generator (not shown), and the process is completed.

[Problem to be solved by the invention]

In the conventional collet chuck system, the allowable range in the radial direction of the workpiece is small, and it is necessary to replace and adjust the chuck each time in response to changes in the radial direction of the target workpiece.

In addition, even in the case of an air chuck (not shown) in which multiple gripping claws move in the radial direction by switching the air, the structure is complicated and the gripping claws have a built-in part that generates the gripping force in the thickness direction. It was difficult to incorporate rings, etc. for positioning. Furthermore, it is necessary to arrange a complicated collet opening/closing mechanism and a driving section of the mechanism on the shaft.

The present invention was made in order to solve the problems in the conventional technology as described above, and it facilitates the incorporation of the mechanism part that determines the thickness of the workpiece, expands the versatility in the radial direction, and makes it possible to attach and detach the workpiece. To provide a chuck device that facilitates automation, and also to provide a chuck device that uses the rotation of the main shaft to create relative movement between the scroll chuck body and the roll part, and can open and close gripping claws without a complicated mechanism. aim at something.

[Means and operations for solving the problems] The present invention will be explained below based on the conceptual diagrams of FIGS. 1a and 1b.

In the present invention, when the roll part 1, which is disposed coaxially with the gripping claw guide part 21 and has a spiral screw on one side, is turned, the gripping claw 2, which has a thread that engages with the roll part 1, moves along the groove 21 provided in the main body. a scroll chuck section 3 that moves in the radial direction and performs opening/closing operations, a main shaft 4 that has the scroll chuck section 3 at its tip and can rotate in forward and reverse directions, and a mechanism that restrains the roll section 1 of the scroll chuck section 3. (hereinafter referred to as a stopper part 5) to move and abut the scroll chuck part 3.

A workpiece 6 is transported and inserted into the chuck gripping claw 2 by a transport device (not shown). Scroll chuck roll part 3
The head stopper section 5 is moved by the moving device 20 until it comes into contact with the roll section I, thereby restraining the rotation of the roll section I. As the main shaft 4 having the scroll chuck part 3 at its tip rotates, a relative movement between the roll part 1 and the chuck part 3 occurs, and the gripping claws 2 open and close to hold the workpiece 6. Thereafter, the stopper part 5 moves away from the roll part 1, and the work gripping state is maintained even when the main shaft 4 rotates. After processing the workpiece 6, the above procedure is reversed to return the workpiece 6 to the transport device.

In the configuration of the chuck device, the gripping claw guide portion 21 is attached to the lower end of the main shaft 4 with its axis being completely bent, and the mounting tube 9 is integrally incorporated inside this by screwing. It is. A roll portion l having a gear on its outer periphery is rotatably supported on the outside of the gripping claw guide portion 21 and is stopped by a retaining ring 30 .

Furthermore, claw grooves 31 are provided in the lower end of the gripping claw guide portion 21 in three radial directions, and grooves 21 that fit with guides 32 formed on both sides of the gripping claws 2 are provided within the claw grooves 31. It is being

A spiral screw 1 provided on the lower surface of the roll portion 1
When the roll part 1 is rotated by the engagement of the screw 2a provided on the upper surface of the gripping claw 2 and the gripping claw 2, the gripping claw 2 moves in the radial direction.

When the workpiece (lens) 6 is conveyed to the lower end of the suction tube 9 by a conveyance device (not shown), the workpiece 6 is suction-held by the suction tube 9 through the suction hole 33 of the main shaft 4 .

〔Example〕

(First Embodiment) A first embodiment of the present invention will be described below based on FIGS. 2 and 3.

In this embodiment, a chuck main body and a suction cylinder 9 arranged coaxially
When the roll part 1, which has a spiral screw on one side, is turned,
A gripping claw 2 having a screw a that engages with it moves in the radial direction along a groove 31 provided in the main body, and a scroll chuck part 3 that performs opening and closing operations, and a normal/reverse rotation having the scroll chuck part 3 at the tip. A gear 12 attached to the main shaft 4 and the roll part 1 of the scroll chuck part 3, a stopper gear 13 that meshes with the gear 12, a housing 25 that holds it rotatably at a certain angle, and the stopper gear 13, It is composed of a detent 22 that hooks one end of the torsion spring 22 and torsion spring 23 arranged coaxially, a rotational position detector 24, and a moving device 20 that moves these to the gear 12.

In addition, the same reference numerals are attached to the same components as those shown in the first drawing, and the explanation thereof will be omitted.

The chuck gripping claws 2 and Helens 6 are transported and inserted by a transport device 20 (not shown). The lens 6 is suctioned and held by a suction tube 9 by a suction device (not shown).

The stopper gear 13 is moved and engaged with the roll part 1 by the moving device until it comes into contact with the roll part 1, thereby restraining the rotation of the roll part.

The stopper gear 13 is arranged on a shaft, and is configured to be able to control rotational torque in one direction by means of an interlocking detent 22 and a torsion spring 23 attached to a housing 25 that rotatably holds the stopper gear 13. has been done.

As the main shaft 4 having the scroll chuck part 3 at its tip rotates, a relative movement between the roll part 1 and the chuck part 3 occurs, and the gripping claws 2 open and close to come into contact with the lens 6. After contact, the roll part 1, chuck part 3, and main shaft 4 move in conjunction (therefore, as the stopper gear 13 rotates in the direction opposite to the rotation of the main shaft 4, the torsion spring 23 is displaced (the third (see figure), and this tightening on the lens 6 via the gripping claw 2 acts as a force.

The amount of displacement of the torsion spring 23 is detected by a rotational position detector 24 disposed coaxially with the stopper gear 13, and when a certain value is reached, the stopper part 5 is removed from the roll part 1 by the moving device 20, and the lens is removed. Maintain the grip state of 6.

After the lens 6 is processed, when the stopper gear 13 comes into contact with the roll portion 1 by the moving device 20, the main shaft 4 rotates in the opposite direction by a certain amount.

As shown in FIG. 3, when the stopper gear 13 rotates in reverse, the detent that is linked to the stopper gear 13 is attached to the housing, so that it does not rotate and the gripping claw 2 of the roll part l that is restrained with the main shaft 4 does not rotate. This acts as a relative movement in the opening direction and returns the lens 6 to the transport device (not shown).

In this embodiment, the roll part 1 is restrained by using the meshing of the gear 12 and the stopper gear 13, so that the restraint effect is reliable and it can be manufactured at low cost.

In addition, since the tightening force can be controlled, it is possible to grip fragile workpieces.

(Second example) A second embodiment of the present invention will be described based on FIG.

Each component is almost the same as in the first embodiment, but the gear 12 in the configuration shown in FIG. 2 becomes the brake disc 14, the stopper gear 13 becomes the brake pad 15, and the brake pad 15 The moving device 16 serves as a moving device 16.

The workpiece 6 is transported and inserted into the chuck gripping claw 2 by a transport device (not shown). The scroll chuck roll part 1 is
It is interlocked with the brake disc 14. The brake pad 15 is actuated by the moving device 16 so as to grip the brake disc 14, and the contact/J1! The frictional force is controlled and maintained, and the rotation of the roll portion 1 is restrained. As the main shaft 4 having the scroll chuck part 3 at its tip rotates, relative movement between the roll part 1 and the chuck part 3 occurs, and the gripping claws 2 open and close to hold the workpiece 6. Thereafter, the brake pad 15 is separated from the brake disc 14, and the gripping state of the workpiece 6 is maintained even when the main shaft 4 rotates. After processing the workpiece 6, the above procedure is reversed and the workpiece 6 is returned to the transport device.

In this embodiment, the roll portion 1 is restrained by gripping the brake disc 14 and the brake pad 15 from above and below, and is controlled and held by friction, so the workpiece 6 is tightened depending on the spindle speed and stopping accuracy. The attachment has little effect on the force, and due to the structure, the load on the main shaft 4 in the radial direction can be reduced.

(Third example) A third embodiment of the present invention will be described based on FIG.

Each component is almost the same as the first embodiment, but the gear 12 in FIG. 2 becomes a friction ring 17, the stopper gear 13 in FIG. 2 becomes a friction block 18, and the moving device 20 in FIG. The movable bag "19" has a function of adjusting the contact force between the bag and the friction ring l7.

The workpiece 6 is transported and inserted into the chuck gripping claw 2 by a transport device (not shown). The scroll chuck roll part 1 is
It is interlocked with the friction ring 17.

The friction block 1B is moved to the roll portion 1 by the moving device 19, and frictionally holds the rotation of the roll portion 1.

As the main shaft 4 having the scroll chuck section 3 at its tip rotates, relative movement between the roll section 1 and the chuck section 3 occurs, and the gripping claws 2 open and close to hold the workpiece 6.

Thereafter, the friction block 18 separates from the friction ring 17, and when the main shaft 4 rotates, the workpiece 6 is returned to the conveying device by performing the opposite procedure to the above procedure. In this embodiment, the restraint of the roll part 1 is Brofuku 18 and a! Rub ring 17
Since the structure is such that the workpiece 6 is held in the radial direction by the frictional force generated by the moving device 19, the speed and stopping accuracy of the spindle have little influence on the force when tightening the workpiece 6.

Further, the tightening force can be varied by frictional force, and the structure is simple.

〔Effect of the invention〕

According to the present invention, the relative movement between the scroll chuck part and the row/structure part can be achieved through a stone bar such as a gear by simply forwarding and reversing the main shaft, so there is no need for a roll rotation drive part, and the structure is simple and inexpensive. It is.

In addition, the air chuck uses a scroll chuck that does not require a complicated mechanism inside the chuck.
There is a large degree of freedom in installing built-in mechanical parts such as suction rings. Furthermore, since the stroke of the gripping claws is large, the versatility in the radial direction is expanded compared to the one using a collet chuck, and it is easy to automate the loading and unloading of workpieces.

[Brief explanation of drawings]

Fig. 1 is a conceptual diagram of the present invention, Fig. 1a is a side sectional view, Fig.
2 and 3 each show a first embodiment of the present invention, FIG. 2a is a side sectional view, and FIG. 2 is a plan view of the scroll chuck,
Fig. 3 is an explanatory diagram of the operation of a torsion spring, Fig. 4 is a side sectional view showing the second embodiment of the present invention, Fig. 5 is a side sectional view showing the third embodiment of the invention, and Fig. 6 is a conventional FIG. 2 is a partially longitudinal side view showing the chuck device of FIG. 1...Roll part 2...Gripping claw 3...Scroll chuck part 4...Main shaft 5...Stomper part 6...Workpiece 20...Moving device

Claims (1)

[Claims] (1) In a chuck device that grips a cylindrical workpiece, etc., when the roll part, which is coaxial with the chuck body and has a spiral screw on one side, is turned, the gripping claw with the screw that engages with the roll part is placed on the same axis as the chuck body, and the gripping claw with the screw that engages with the roll part is placed coaxially with the chuck body. a scroll chuck part that moves in the radial direction along a groove provided in the scroll chuck part and performs opening/closing operations; a main shaft having the scroll chuck part at the tip that can rotate forward and reverse; and a stopper restraining the roll part of the scroll chuck part. A chuck device comprising a scroll chuck section and a moving device for moving the stopper section to a scroll chuck section.