JPH09131605A - Detent cap fixing device in collet chuck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily attach/detach a hook to/from a cap without using a tool even when the hook to fix the cap is at an arbitrary position by providing a hook of click-stop type to attach/detach a detent cap to/from an engagement groove on a front end face of a fixed cylinder. SOLUTION: In changing a chuck part, a trigger 10a of a hook 10 is pressed in the centrifugal direction of a cap 4, and a lock ball 15 is inserted against a compression spring 14, and the hook 10 is turned to be attached/detached to/from an engagement groove 5. A detent cap 4 and the chuck part can be removed thereby. Another chuck part for change is fitted to a spindle in a reverse operation. The hook 10 is fixed by automatically engaging the lock ball 15 with a locking recessed hole 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detent cap for holding a chuck portion of a collet chuck such as a lathe,
The present invention relates to a device that is easily fixed without using a tool.

[0002]

2. Description of the Related Art FIGS. 3 and 4 schematically show a collet chuck of a lathe equipped with a conventional fixing device.
A chuck portion (2) is detachably fitted to the front end of (1). Male thread (3) cut on the outer peripheral surface of the front end of the spindle (1)
A rear portion of a cylindrical detent cap (4), the front portion of which is tightly fitted to the chuck portion (2), is screwed to the outer peripheral surface of which a large number of engaging grooves parallel to the axis. (5) is cut.

At the front part of the main shaft (1), a detent cap
(4) Cylindrical fixed cylinder that surrounds the rear part with a slight gap
The rear part of (6) is fitted and fixed by a fixing bolt (7).

As shown in FIG. 4, on the front end surface of the fixed cylinder (6), a base of an inverted L-shaped hook (8) whose tip is bent in the axial direction is provided with a hexagon socket bolt ( 9) Attached, always fixed with bolts (7), hook
Since the tip of (8) engages with the engaging groove (5) of the cap (4), the detent cap (4) is fixed so as not to rotate. (8a) is a finger hanging piece.

[0005]

The collet chuck is
When it becomes worn or the size of the work (not shown) to be grasped changes, the chuck part (2) may be replaced. In that case, loosen the bolt (9) and hook it. After rotating (8) to disengage it from the engagement groove (5), it is necessary to rotate the detent cap (4) to remove it from the main shaft (1).

At this time, if the hook (8) is located below the chuck (2), the operation of the tool for turning the bolt (9) is hindered by other members of the lathe, which makes it difficult. for that reason,
Start the motor, rotate the main shaft (1) slightly, and hook
It was necessary to position (8) above, which was troublesome. It is an object of the present invention to provide a fixing device that can solve this problem.

[0007]

According to the present invention, the above object is to provide a plurality of locking grooves on the outer peripheral surface which are parallel to the axis.
In addition, the rear portion was screwed onto the outer peripheral surface of the front end of the spindle, and the front portion was a cylindrical detent cap externally fitted to the chuck portion, and the rear portion was fitted to the front end of the spindle so as to surround the rear portion. In a collet chuck such as a lathe having a fixed barrel, the problem can be solved by providing a click stop type hook on the front end surface of the fixed barrel that engages and disengages with the engagement groove of the detent cap.

[0008]

1 and 2 show the essential parts of a collet chuck to which the present invention is applied. The same members as those described above are designated by the same reference numerals, and a detailed description thereof will be given. Omit it.

In place of the above-mentioned conventional hook, the base end of the hook (10) shown in the figure is rotatably attached by a pin (11) to the front end surface of the fixed barrel (6), and the free end thereof is free. In the center of the rear surface of the end, a recessed spherical engaging recess (12) is provided. (10a)
Is a finger rest.

Locking concave hole (12) in the front end surface of the fixed cylinder (6)
A compression coil spring (14) and a lock ball (15) are inserted in order from the bottom into the bottomed hole (13) formed at the location corresponding to
The lock ball (15) biased outward is prevented from falling out by the reduced diameter portion by caulking the outer edge of the bottomed hole (13), and partly protrudes outward. .

The tip of the hook (10) is always capped (4).
Engage with the engaging groove (5) of the lock ball (1)
It is fixed by engaging 5).

In the present apparatus, when replacing the chuck part (2), the finger hook (10a) of the hook (10) is capped with a finger.
If pressed in the centrifugal direction of (4), the lock ball (15) is pushed against the compression coil spring (14), and the hook (10) rotates and is disengaged from the engaging groove (5). The detent cap (4) and the chuck (2) can be removed.

Another chuck part (2) for replacement can be attached to the main shaft (1) by the reverse operation to the above, and the hook (10) is locked in its locking recess (12). Ball (1
5) is fixed by automatically engaging.

[0014]

According to the present invention, when the detent cap is attached / detached to replace the chuck portion of the collet chuck, the hook for fixing the cap is at any position.
Since the hook can be easily engaged with and disengaged from the cap without using a tool, the labor and time required for exchanging the chuck portion can be significantly saved.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a collet chuck to which the present invention is applied.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a partially central longitudinal side view of a conventional collet chuck.

FIG. 4 is a front view of the same.

[Explanation of symbols]

 (1) Spindle (2) Chuck part (3) Male screw part (4) Non-rotating cap (5) Engagement groove (6) Fixing tube (7) Fixing bolt (8) Hook (8a) Finger hook (9) Bolt (10 ) Hook (10a) Finger hook (11) Pin (12) Engagement concave hole (13) Bottom hole (14) Compression coil spring (15) Lock ball

Claims (1)

[Claims] 1. A cylindrical shape having an outer peripheral surface provided with a plurality of locking grooves parallel to an axis, a rear portion screwed into a front end outer peripheral surface of a main shaft, and a front portion externally fitted to a chuck portion. In a collet chuck such as a lathe having a rotation stopper cap and a fixed cylinder whose rear portion is fitted to the front end of a main shaft so as to surround the rear portion, a front end surface of the fixed cylinder is engaged with an engagement groove of the rotation stopper cap. A locking device fixing device for a collet chuck, which is provided with a click-stop type hook for removing.