JPH065809U - Work discharge device - Google Patents

Abstract

(57) [Summary] [Purpose] The extrusion rod for discharging the work is stably moved so that the work gripping position is always constant. [Structure] An expansion rod 23 fitted into an insertion hole 22 formed in a shaft cylinder 21 is integrally formed with a diameter expansion stop portion 24 for stopping the extrusion rod 23, so that the stop portion 24 is repeatedly violent. Even if an impact is received, the pushing rod 23 can move stably, and the work gripping position is always constant.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for automatically ejecting a work grasped by a collet chuck such as a lathe after finishing the machining.

[0002]

[Prior art]

 3 and 4 show a collet chuck (3) in which a piston (1) for a hydraulic valve adjuster for an internal combustion engine, which is a type of work, is fitted to a rotary cylinder (spindle) (3) of a headstock (2) in a lathe. The main part of the work gripping device for gripping by (A) and cutting the end face (1a) is shown.

A conventional work discharge device (B) is provided in the collet chuck (A). A rotary cylinder (3) is pivotally supported by a headstock (2) via a bearing (4), and its inner surface has a front end (right end in the drawing, hereinafter rightward is referred to as front) that expands in diameter toward the front. A tapered hole (5) is formed.

A pulley (6) is fitted in the center of the outer surface of the rotary cylinder (3), and the rotary cylinder (3) is formed by a V-belt (both not shown) wound between the pulley (6) and the motor. Rotate.

The collet chuck (A) is integrally connected to a cylindrical drawbar (7) which is slidably fitted in the rotary cylinder (3) in the front and rear direction, and a plurality of collet chucks (A) are arranged in parallel with the axis line of the front part thereof. At the front end of the flexible part (8a) divided into two parts, the outer surface is tapered and the gripping part (8) that is in close contact with the tapered hole (5) of the rotary cylinder (3) is connected to the front surface. There is.

Although not shown, the collet chuck (A) expands and contracts by grasping the work by moving the draw bar (7) back and forth by a hydraulic cylinder provided at the rear of the rotary cylinder (3). Do and release.

The work discharging device (B) is composed of a round rod-shaped stopper rod (9) fitted in the draw bar (7) and a shaft cylinder (10) screwed to the front end of the rod. 9) is normally fixed at a predetermined position by a front and rear position adjusting device (not shown). The shaft cylinder (10) is loosely fitted in the flexible part (8a), and two large and small hollow holes (11a) and an insertion hole (11b) communicating with each other are formed on the central axis thereof.

The rear end portion of the work pushing rod (12) having the enlarged diameter portion (12a) at the front end is slidably inserted through the small diameter insertion hole (11b) at the front portion of the shaft cylinder (10). There is.

At the rear end of the push rod (12), a stopper plate (13) having a diameter slightly smaller than the inner diameter of the barrel (10) is fixed with a bolt (14), and the push rod (12) has a hollow hole. Inside (11a), the compression coil spring (15) contracted between the stopper plate (13) and the front end of the stopper rod (9) is constantly urged forward to keep the stopper plate (13) hollow. It is prevented from coming off by coming into contact with the step portion of the hole (11a) and the insertion hole (11b).

The work discharging device (B) described above is a collet in which the front and rear positions of the stopper rod (9) are fixed at predetermined positions corresponding to the size of the piston (1), and the diameter of the collet is expanded slightly by advancing. If the piston (1) is pushed into the grip (8) of the chuck (A) by the push pin (16), the push rod (12) compresses the spring (15) and expands the diameter (12a). ) Retreat until the rear end contacts the front end face of the barrel (10).

Next, when the drawbar (7) is retracted, the piston (1) is gripped at a predetermined position by the gripping portion (8) whose diameter is reduced, and when the rotary cylinder (3) is rotated in this state, both are rotated. The end face (1a) of the piston (1) to be cut can be cut with a cutting tool (not shown).

After the cutting is completed, the draw bar (7) is moved forward and the grip (8) releases the piston (1), so that the piston (1) is pushed by the pushing rod (12) by the spring (15). , It is released forward by vigorously projecting.

[0013]

[Problems to be solved by the device]

 In the conventional work discharging device (B) described above, the stopper plate (13) of the pushing rod (12) repeatedly collides with the inner bottom surface of the shaft cylinder (10) every time the piston is discharged. (14) may gradually loosen. In this case, the stopper plate (13) tilts and interferes with the inner surface of the barrel (10), the movement of the pressing rod (12) becomes slow, or it stops midway, and Is not gripped at a fixed position, resulting in a processing error. In addition, the machined piston (1) may not be discharged promptly or may remain in the grip (8).

Furthermore, since the reference surface when gripping the work is the front end surface of the shaft cylinder (10), looseness is likely to occur in the threaded portion between the stopper rod (9) and the shaft cylinder (10). If it occurs, an error will occur in the processing accuracy.

An object of the present invention is to provide a work discharging device that can prevent such a problem from occurring.

In order to achieve the above-mentioned object, the present invention provides a front end of a stopper rod, which is provided on the axis of a chuck of a lathe or the like so as to be adjustable in the front-rear position, and has insertion holes of different sizes, which communicate with each other. The rear end of the provided shaft cylinder is fitted, and the work piece pushing rod integrally formed with the diameter expansion stop portion in the center is inserted into the insertion hole so that the diameter expansion stop portion contacts the stepped portion in the insertion hole. In addition, the front end of the pushing rod is urged so that the front end of the pushing rod penetrates the small-diameter insertion hole and always projects toward the front of the barrel.

[0017]

[Action]

 Since the diameter expansion stop that stops the extrusion rod is molded integrally with the extrusion rod, the extrusion rod will move stably even if the stop is repeatedly subjected to a strong impact due to the reciprocating motion of the extrusion rod. Therefore, the work gripping position is always constant.

[0018]

【Example】

 1 and 2 show an embodiment of the device of the present invention. It should be noted that the same members as the conventional ones are denoted by the same reference numerals, and detailed description thereof will be omitted.

The work discharge device (C) of the present invention is configured as follows. The rear end of the shaft cylinder (21) is screwed to the front end of the stopper rod (9), and the insertion hole (22) at the front end of the stopper rod (9) has a large-diameter stop (nearly in the middle). The work push-out rod (23) provided with 24) is slidably inserted.

The stop portion (24) and the rear end side of the pushing rod (23) are housed in a hollow hole (11a) having a diameter larger than that of the insertion hole (22).

The pushing rod (23) is constantly urged forward by a compression coil spring (15) which is contracted between the stopper (24) and the stopper rod (9), and the stopper (24) is By coming into contact with the stepped portion (25) in the shaft cylinder (21), it is prevented from coming off. In the normal state, the front end of the pushing rod (23) is located immediately after the center of the gripping part (8) in the collet chuck (A).

In the apparatus of the above embodiment, the front and rear positions of the stopper rod (9) are fixed at predetermined positions corresponding to the size of the piston (1), and the gripping portion (8) is advanced and expanded in diameter. If the piston (1) is pushed into the inside by the push pin (16), the pushing rod (23) compresses the spring (15), and the rear end of the pushing rod (23) becomes the front end of the stopper rod (9). Retreat until it abuts.

Then, the drawbar (7) is retracted, the piston (1) is held at a predetermined position, and the rotary cylinder (3) is rotated by the motor, so that the end face of the piston (1) that rotates together is rotated. (1a) is cut with a cutting tool (not shown).

After the cutting is completed, if the draw bar (7) is advanced to release the piston (1), the piston (1) is urged forward by the pushing rod (23) protruding by the urging force of the spring (15). Often released.

[0025]

[Effect of device]

 The device of the present invention has the following effects. (a) Since the diameter expansion stop portion for stopping the extrusion rod is formed integrally with the extrusion rod, it is extremely strong, and the extrusion speed of the extrusion rod (23) becomes slow even after long-term use. And does not stop halfway.

(B) Therefore, since the gripping position of the work is always a fixed position, the processing accuracy is improved and the processed work can be reliably discharged.

(C) Since the reference surface at the time of gripping the work is the front end of the stopper rod, even if the threaded portion between the axial cylinder and the stopper rod is loosened, the machining accuracy is not affected. .

[Brief description of drawings]

FIG. 1 is a central longitudinal side view of a collet chuck unit according to an embodiment of the present invention before starting work gripping.

FIG. 2 is a side view of the central longitudinal section at the end of gripping the work.

FIG. 3 is a central longitudinal side view of a collet chuck unit including a conventional work discharge device before starting work gripping.

FIG. 4 is a side view of the central longitudinal section at the end of gripping the work.

[Explanation of symbols] (A) Collet chuck (C) Work discharge device (1) Piston (work) (2) Headstock (3) Rotating cylinder (4) Bearing (5) Tapered hole (6) Pulley (7) Drawbar (8) Gripping part (8a) Flexible part (9) Stopper rod (11a) Hollow hole (insertion hole) (15) Compression coil spring (16) Push pin (21) Shaft cylinder (22) Insertion hole (23) Extrusion Rod (24) Expansion stop (25) Step

Claims (1)

[Scope of utility model registration request] 1. A rear end of a shaft cylinder provided with insertion holes of different sizes that communicate with each other is fitted to a front end of a stopper rod that is provided on a shaft of a chuck of a lathe or the like so as to be adjustable in front-rear position. A work pushing rod having a diameter expansion stop integrally formed at the center is inserted into the insertion hole so that the diameter expansion stop comes into contact with a step in the insertion hole, and the front end of the extrusion rod has a small diameter insertion hole. The work discharging device is characterized in that the work discharging device is housed in such a manner that it is urged so that it always penetrates through and protrudes forward of the barrel.