JP2520870Y2 - Chuck for lathe - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a lathe chuck that is used when the inner peripheral surface or the outer peripheral surface of a workpiece is grasped by a plurality of chuck claws and a required portion of the workpiece is turned. It is a thing.

[Conventional technology]

When cutting the required part of the work with the chuck of the lathe,
In many cases, the inner diameter or outer diameter of the work is grasped by a plurality of chuck claws provided on the front surface of the chuck body.

[Problems to be solved by the device]

As described above, when grasping the work on the front surface of the chuck body with the chuck claws, it is necessary to replace the chuck claws having different shapes, sizes, and shapes with each other, which is very troublesome.

An object of this invention is to provide a lathe chuck that can grasp a new work by simply replacing the child claw with a simple mechanism even if the shape or size of the work changes in order to solve the above problems. is there.

[Means for solving the problem]

In order to solve the above problems, a first invention is a lathe chuck in which a front surface of a chuck body is provided with a plurality of chuck claws which are opened and closed by appropriate driving means. It consists of a parent claw that can be freely opened and closed, and a separate child claw that is detachably attached to the workpiece grasping side of this parent claw.Each parent claw is equipped with a push pin that moves forward and backward in the radial direction of the chuck. , The front surface of each push pin is provided with a fitting projection that is detachably fitted from the rear into a fitting hole provided on the rear side of the child claw to prevent the child claw from moving in the radial direction. The work gripping side of the claw is provided with a receiving surface for receiving the back surface of each child claw, and each parent claw and child claw are engaged with each other under the condition that the back surface of the child claw is in close contact with the receiving surface of the parent claw. A pair of protruding ridges to be arranged is provided, and the pair of protruding ridges engaged with each other causes the child claws from the parent claw It was so as to prevent detachment of the chuck body axis direction forward.

In a second aspect of the invention, in the first aspect of the invention, the receiving surface of each parent claw and the rear surface of each child claw are sloped with their front ends closer to the work gripping side, and each push pin has Under the condition that the fitting protrusion and the fitting hole of the child claw are fitted together, a spring that pushes the push pin in the direction in which the back surface of the child claw is pressed against the receiving surface of the parent claw is mounted.

[Action]

Since the present invention has the above-mentioned configuration, when the work is grasped, the parent claw and the child claw of each chuck claw are in close contact with each other and integrally coupled.

That is, when the fitting projection provided on the push pin of each parent claw and the corresponding fitting hole provided on the child claw are fitted, and the receiving surface of the parent claw and the back surface of the child claw are in close contact with each other. Is engaged with the locking portions of the parent claw and the child claw in the axial direction of the chuck body, the child claw is fixed to the parent claw in both the radial direction and the axial direction of the chuck body. Regarding the direction, the locking portions arranged in the circumferential direction are formed by a set of ridges and can cope with the shearing force in the axial direction over a wide range, so that they are firmly and reliably fixed.

Then, when exchanging the child claws, if each push pin is moved to the work grasping side in the radial direction, the fitting projection of the push pin moves the parent claw fitted to this to the work grasping side. Therefore, the parent claw and the child claw are separated in the radial direction, and the child claw can be taken out to the front side in the axial direction of the chuck body. To attach a new claw, the reverse operation of this operation may be performed.

Also, if the front surface of each parent jaw and the back surface of each child jaw are sloped so that the front end is closer to the workpiece grasping side, the Due to the wedge action due to the inclination of the receiving surface and the back surface of the child claw, a component force that presses the child claw and the work toward the chuck body side acts to strengthen the binding force of the work to the chuck body.

Therefore, a spring that pushes the push pin in the direction in which the back surface of the child claw is crimped to the receiving surface of the parent claw is installed under the condition that the fitting protrusion of the push pin and the fitting hole of the child claw are fitted together. When the work grip is released, the parent claw and child claw are still connected by the spring that acts on the push pin, so this chuck claw can be opened and closed like a conventional integrated chuck claw. You only have to move the pushpin against the spring to remove it.

〔Example〕

In the first embodiment shown in FIGS. 1 and 2, 1 is a chuck body, which is integrally connected to the main shaft of a lathe by a bolt at its rear portion.

A plurality of swinging bodies 3 swinging around a shaft 2 are provided near the outer periphery of the main body 1, and chuck claws 4 are fixed to the outer ends of the swinging bodies 3.

Reference numeral 5 is a guide hole in the center of the rear portion of the main body 1, 6 is a drive member provided in a space inside the main body 1, and a tubular portion 7 at the rear portion thereof is fitted into the guide hole 5 so as to be able to move forward and backward, and a draw bar 8 It is connected.

The driving member 6 is provided with a fitting hole 10 having a spherical inner surface at a position corresponding to each rocking body 3, and a spherical rotating body 11 having an eccentric inclined hole 12 is rotatably mounted in each hole 10. .

In the eccentric inclined hole 12 of the rotating body 11, a shaft 13 integrally provided on the rear portion of the rocking body 3 is slidably inserted, and the rotating body 11 and the shaft 13 are prevented from rotating by a slide key 14.

Further, a crimping member 16 is slidably mounted in the recessed hole at the rear end of the shaft 13 and is crimped to the rear wall 9 of the main body 1 by a spring 17.

Each of the chuck claws 4 is composed of a master claw 20 and a separate claw 21. The radial holes 15 provided in each of the master claws 20 are provided with push pins 22 that move forward and backward in the radial direction of the chuck body 1. The push pin 22 is attached to the front side of the parent claw 20 through the long hole 28 of the parent claw 21, and is fitted into the fitting hole 24 on the rear side of the child claw 21 from the rear side so as to be detachable from the rear side. A pin-shaped fitting projection 25 for preventing the movement in the direction is provided, and a receiving surface 26 for receiving the back surface 27 of each child claw 21 is provided on the work grasping side of each parent claw 20.

Further, a part of the parent claw 20 and the child claw 21 are engaged with each other under the condition that the back surface 27 of the child claw 21 is in close contact with the receiving surface 26 of the parent claw 20, and the child from the parent claw 20. A ridge 29 for preventing the claw 21 from separating from the front side in the axial direction of the chuck body, and a ridge engaged with the ridge 29.
30 are provided, and a guide piece 19 having a guide hole 18 is provided at the front end of each parent claw 20.

In addition, the receiving surface 26 of each parent claw 20 and the back surface 27 of each child claw 21 are
The front end is a sloped surface that is closer to the work gripping side, and each push pin 22 is fitted with the fitting protrusion 25 of this push pin 22 and the fitting hole 24 of the child claw 21 under the condition that the child claw 21 back
Push pin 22 in the direction in which 27 is pressed onto the receiving surface 26 of parent claw 20
Attach the spring that presses.

Also, a work stopper is provided at the center of the front surface of the chuck body 1.
Fix 31.

In the above embodiment, FIGS. 1 and 2 show a state in which the work piece 32 is grasped. The parent claw 20 and the child claw 21 are integrally connected, and the child claw 21 grasps the outer circumference of the work 32. There is.

At this time, the fitting protrusion 25 of the push pin 22 and the fitting hole 24 of the child claw 21 are fitted together, and are pushed outward by the spring 23 so that the projection 29 of the parent claw 20 and the projection 30 of the child claw 21 are pushed. Since the and claws are engaged with each other, the parent claw 20 and the child claw 21 are integrated.

Further, since the draw bar 8 is pulled leftward in FIG. 1 by an air cylinder or the like, a force for rotating the chuck claw 4 inward is exerted on each rocking body 3.

Therefore, each chuck claw 4 grasps the work 32, and the receiving surface 26 and the back surface 27 are strongly pressed by the reaction force.

After grasping the work 32 with each chuck claw 4 and performing the turning process as described above, in order to remove the work 32 from the chuck, the draw bar 8 is moved forward under the condition that the chuck stands at a predetermined position and driven together with it. When the member 6 is advanced to open the front part of each rocking body 3 outward, the child claws 21 of each chuck claw 4
Moves away from the work 32 and solves the grasp of the work 32.

Further, in order to remove each child claw 21, the operating rod 35 as shown by the chain line in FIG. 1 is moved to the chuck claw 4 as shown by an arrow a and inserted into the guide hole 18, and the tip thereof. After engaging with the engaging hole 36 of the push pin 22, when the operating rod 35 is turned in the direction of the arrow b, the push pin 22 compresses the spring 23 and the child claw 21.
At the same time, it moves in the direction of the axis of the chuck, and the projection 30 of the child claw 21 is removed from the projection 29 of the parent claw 20.

In this state, the child claw 21 can be easily removed by grasping the child claw 21 by pulling the child claw attachment / detachment means (not shown) and pulling it to the right in FIG.

The second embodiment shown in FIGS. 3 and 4 is different from the first embodiment only in the drive mechanism of the chuck claw 4 and is different from the master claw 20.
Since the engaging and disengaging mechanism of the child claw 21 is the same, only different points will be described.

In this embodiment, each of the parent claws 20 is integrally provided on the front portion of a rod-shaped body 37 having an oval cross section as shown in FIG. 4, and the rod-shaped body 37 spreads forward on the front wall 39 of the main body 1. It is inserted into a plurality of inclined holes 40 provided at the front side so as to be able to move back and forth.

The drive member 41 in the main body 1 has an umbrella shape, and the front surface thereof is a surface orthogonal to the center line of each of the inclined parent claws 20.

Then, the notch 42 is provided from the outer periphery of the position corresponding to each parent pawl 20 of the drive member 41, and the small diameter shaft portion 43 at the rear end of each parent pawl 20 is engaged with each notch 42. This small diameter shaft 43
Locking pieces 44 formed in a T shape on both sides of the rear end are locked to the rear side of the driving member 41, and when the driving member 41 advances and retracts, each parent claw 20 is moved along each inclined hole 40. It has a structure that moves forward and backward in a diagonal direction.

The tubular portion 45 at the rear portion of the driving member 41 is fitted in the central guide hole 46 of the rear wall 9 of the main body 1 so as to be able to move back and forth, is connected to the draw bar 47, and is driven by an air cylinder or the like.

To explain the operation of the second embodiment, FIGS. 3 and 4 show a state in which the work 48 is grasped, and the parent claw 20 and the child claw 21 are integrally connected, and the child claw 21 is Knowing the outer circumference of the work 48.

At this time, similarly to the first embodiment, the fitting protrusion 25 of the push pin 22 and the fitting hole 24 of the child claw 21 are fitted to each other and are pushed outward by the spring 23 so that the projection 29 of the parent claw 20 is pushed. Since the projection 30 of the child claw 21 is engaged with the child claw 21, the parent claw 20 and the child claw 21 are integrated.

Further, since the draw bar 47 is pulled to the left as shown in FIG. 3 by an air cylinder or the like, each rod-shaped body 37 has each inclined hole 40.
Along with the work piece 48, the work piece 48 is grasped by the chuck claws 4 at the tip of the work piece, and the receiving surface 26 and the back surface 27 are strongly crimped by the reaction force, and the work piece 48 is crimped to the work stopper 49. I am busy.

After removing the workpiece 48 from the chuck after grasping the workpiece 48 with each chuck claw 4 and performing the turning processing as described above, the draw bar is used while the chuck is stationary at a predetermined position.
47 together with the drive member 41 to move the rod-shaped members 37
When it is advanced along 40, each chuck claw 4 moves outward and the child claw 21 separates from the work 48.

Further, in order to remove each child claw 21, the tip of the operating rod 50 as shown by the chain line in FIG. 3 is engaged with the notch 51 of the main body 1 and rotated as shown by an arrow c to push the push pin 22. Press the outer edge. Then, this push pin 22 compresses the spring 23 and the child claw
It moves in the direction of the axis of the chuck together with 21, and the engagement state between the projection 30 of the child claw 21 and the projection 29 of the parent claw 20 is released.

In this state, the child claw 21 can be easily removed by grasping the child claw 21 by means of a child claw attaching / detaching means (not shown) and pulling it to the right in FIG.

In each of the above-mentioned embodiments, the case where the outside of the work 32 or 48 is grasped by the chuck claws 4 and the turning process is performed on the front surface or the inner circumference of the work 32 or 48 has been described. When processing the outer periphery of
The positions and working directions of the parent claw 20 and the child claw 21 of each chuck claw 4 may be reversed inward and outward.

[Effect of device]

This invention, as described above, includes a chuck claw provided on the chuck body, a master claw that is openably and closably attached to the chuck body,
Since it is configured with a separate child jaw that is detachably attached to the workpiece grasping side of this parent jaw, the size and shape of the workpiece can be changed simply by replacing the child jaw while the parent jaw is still attached to the chuck body. Can handle.

Further, push pins that advance and retreat in the radial direction of the chuck are mounted on the parent claws, and the push pins are detachably fitted from the rear into the fitting holes on the back side of the child claws on the front side of the push claws. Providing a fitting protrusion to prevent movement in the radial direction,
On the work grasping side of each of the parent claws, a receiving surface for receiving the back surface of each of the claws is provided, and under the condition that the parent claw and the claw are closely attached to the receiving surface of the parent claws. Since a set of protrusions that engage with each other is provided, when the receiving surface of the parent claw and the back surface of the child claw are in close contact, the pair of protrusions provided on the parent claw and the child claw are also in the engaged state. Therefore, the child claw is fixed in both the radial direction and the axial direction of the chuck main body with respect to the parent claw, and in particular, in the axial direction, the locking portions arranged in the circumferential direction form a set of protrusions. Since it is formed by the above method and can cope with the shearing force in the axial direction over a wide range, it is firmly and surely integrated.

Also, the push pin can be moved toward the workpiece and the child claw can be removed by pulling the child claw forward by some means, and the child claw can be attached in the reverse operation, so attachment and removal of the child claw is extremely easy. Is.

Furthermore, if the front surface of each parent claw and the back surface of each child claw are sloped so that the front end is closer to the workpiece grasping side, the The wedge action due to the inclination of the receiving surface and the back surface of the child claw exerts a component force that presses the child claw and the work toward the chuck body side, and the effect of strengthening the binding force of the work to the chuck body is obtained.

In addition to this configuration, the push pin is pushed in the direction in which the back surface of the child claw is pressed against the receiving surface of the parent claw under the condition that the fitting protrusion of the push pin and the fitting hole of the child claw are fitted together. With a spring attached, when the grasp of the work is released,
The spring that acts on the push pin keeps the parent claw and child claw still connected, so when removing the claw, you only have to move the push pin against the spring, and the chuck claw is a conventional integrated chuck claw. It can be opened and closed as well as, and is very easy to handle.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing a first embodiment of the chuck of the present invention, FIG. 2 is a front view of the same as above, FIG. 3 is a vertical sectional side view of the same as the second embodiment, and FIG. It is a figure. 1 ... Chuck body, 4 ... Chuck claw, 20 ... Parent claw,
21 …… Child claw, 22 …… Push pin, 23 …… Spring, 24, 25
...... Mating part, 26 …… Receiving surface, 27 …… Rear surface, 29,30 …… Locking part, 32,48 …… Workpiece, 35,50 …… Control rod,

Claims (2)

(57) [Scope of utility model registration request] 1. A lathe chuck having a plurality of chuck claws which are opened and closed by an appropriate driving means on the front surface of the chuck body, wherein each of the chuck claws is a parent claw that is openably and closably attached to the chuck body. It is composed of a separate child claw that is detachably attached to the workpiece grasping side of the parent claw, and each of the parent claws is equipped with a push pin that advances and retracts in the radial direction of the chuck. A fitting projection is provided in the fitting hole provided on the rear side of the child claw so as to be detachably fitted from the rear side to prevent the child claw from moving in the radial direction. A receiving surface for receiving the back surface of the claw is provided, and each parent claw and child claw are provided with a set of ridges that engage with each other under the condition that the back surface of the child claw is in close contact with the receiving surface of the parent claw, This engaging ridge makes it possible to disengage the child claw from the parent claw in the axial direction forward of the chuck body. A lathe chuck characterized by being blocked. 2. The receiving surface of each parent claw and the back surface of each child claw are sloped with the front end being closer to the work gripping side, and each push pin is fitted with a fitting projection of the push pin and a child claw. The lathe according to claim 1, further comprising a spring that pushes the push pin in a direction in which the back surface of the child claw is crimped to the receiving surface of the parent claw when the hole and the hole are fitted together. Chuck.