JPS6071150A - Chuck pawl changing device - Google Patents

Abstract

PURPOSE:To make it possible to change all chucks in one-time changing step, by rotatably providing a pawl storage ring in a chuck pawl changing device in a lathe, and by providing pawl changing mechanisms each composed of means for engaging and disengaging between pawls and chucks and means for transferring the chucks. CONSTITUTION:A storage ring 16 capable of storing a plurality of pawls 12 to be changed is rotatably arranged around a chuck 5. Further, pawl changing mechanisms composed of means for engaging and disengaing between the pawls and the chuck 5, such as, for example, a release cylinder 23, a release lever 23a, etc. and means for transferring the pawls 12 between the storage ring 16 and the chuck 5, such as, for example, a shift cylinder 20, a shifter 21, an arm 22, etc., are provided in a number which is equal to the number of pawls 12 that may be set on the chuck 5. Accordingly, all the chuck 12 may be simultaneously changed so that the time necessary for changing the pawls 12 are remarkably reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (fl)0 Technical Field of the Invention The present invention relates to a chuck jaw changing device that allows all chuck jaws in a lathe to be replaced at the same time.

(b) Background of the Technology Automation of setup work such as tool exchange in lathes has recently become remarkable, and various proposals have been made regarding automation of chuck jaw exchange.

(C), Prior Art and Problems Conventionally, chuck jaw changing devices have been known to replace each chuck jaw one by one using a turret. However, the number of replacement operations required is equal to the number of pawls, which requires a lot of time, which has the disadvantage of deteriorating the actual machining efficiency of the lathe.

Additionally, a method has been proposed in which a rotating arm is provided between the chuck and a separately provided means for storing the jaws, and the arm is used to simultaneously replace the jaws on the chuck. Pivoting of the arm is extremely problematic in terms of safety.

(d) 0 Purpose of the Invention The present invention eliminates the above-mentioned drawbacks. It is possible to replace all the jaws on the chuck at the same time in - times of replacement operations, and the time used for replacing the jaws is increased by +11. The first objective is to provide a chuck jaw changing device that can be shortened to fi.
The object of the present invention is to provide a highly safe chuck jaw changing device that does not require the use of a rotating arm or the like.

(e) Configuration of the 0 invention, that is, the present invention provides a storage ring capable of storing a plurality of replacement jaws in a manner surrounding the chuck so as to be rotatable and drivable, and a disengagement means for disengaging the jaws and the chuck; A number of pawl exchange mechanisms, each consisting of a transfer means for transferring the pawls between the storage ring and the chuck, are provided in a number equal to the number of pawls that can be attached to the chuck.

(f) 0 Examples of the invention Examples of the present invention will be described below based on the drawings. will be explained in detail.

FIG. 1 is a perspective view showing an embodiment of the chuck jaw changing device according to the present invention, FIG. 2 is a front view of the chuck jaw changing device of FIG. 1, and FIG. 3 is a side sectional view of FIG. 2. , FIG. 4 is a sectional view showing the state of engagement between the master jaw and the claw, FIG. 5 is a sectional view taken along line V-V in FIG. 4, and FIG. Fig. 7 is a view in the direction of the ■ arrow in Fig. 3 showing the relationship between the two, Fig. 7 is a view in the direction of the - arrow in Fig. 3 showing the driving state of the arm, and Fig. 8 shows the engagement relationship between the clamping rod and the lock pin. , Figure 5 ■
It is a sectional view taken along the line -■.

As shown in FIGS. 1 to 3, the lathe 2 has a headstock 3, and a saw chuck 5 is rotatably supported by the headstock 3, which is connected to a main shaft (not shown). As shown in FIG. 6, the chuck 5 is formed with continuous slide grooves 5a and 5e, and the slide groove 5a is equipped with a shifter 6, which is a known drive mechanism, as shown in FIG. Accordingly, three master jaws 7, which are movable and movable in the directions of arrows A and B, are fitted and installed at a pitch of 120 degrees, and each master jaw i? -7, a clamping rod 9 is provided movably in the Z-axis direction, that is, in the directions of arrows C and D. Five coil springs 10 are compressed between the clamping rod 9 and the master jaw 7, and the coil springs 10 always bias the clamping rod 9 in the direction of the arrow. The clamping rod 9 has a cylindrical sliding surface 9a, and one side of the sliding surface 9a has a
As shown in FIG. 8, a cam il 9b is formed. Also, the lock pin 11 is located at the arrow A on the master jaw 7.
, is provided so as to be slidable in direction B, and an engaging protrusion 11a on the lock pin plate engages with the cam groove 9 of the clamping rod 9.
The tip is engaged with b. A rack 9C is formed on the right side surface of the clamping rod 9 in FIG.

Further, a pawl 12 is fitted into and engaged with the slide groove 5e so as to be movable in the directions of arrows A and B.
A rack 12a is formed at a position facing the rack 9C so as to be freely engageable with the rack 9c. Note that the claw 12 is formed with an engagement groove 11b.

Further, the chuck claw changing device 1 according to the present invention is provided around the chuck 5, and the chuck claw changing device 1ζ has a disc-shaped claw storing device W13. As shown in FIG. 3, the pawl storage device] 31 has a frame 15 provided on the headstock 3 so as to be movable only in the Z-axis direction via a key 15a. It is provided so as to be freely movable and driven in the Z-axis, that is, in the directions of arrows C and D, by a cylinder 14 installed at. Also,
A storage ring 16 is supported on the frame 15 so as to be rotatable around ZIII.
The four claw storage IQs 16a are formed at equal angular pitches, that is, 15° pitches, and in a shape that allows the claws 12 to be freely inserted and removed in the directions of arrows A and B. As shown in FIG. 7, the groove 16a of the ring 16 is formed with an escape groove 16.
b is formed by drilling in the direction of arrows A and B, which are radial directions centered on the Z axis, and a replacement pawl 1 is provided in the valley groove 16a.
2 are stored in sets of three at 120° pitch, so eight types are stored every seven (including those currently being mounted on the chuck 5).

A gear 16c is formed in the storage ring 16 over an angle α of 120° or more, and the output shaft of the indexing motor 17 installed on the frame 15 is connected to the gear 16c.
They mesh through 7a.

(Blank below) On the other hand, the chuck jaw changing device 1 has three jaw changing mechanisms 19, which are equal in number to the number of jaws that can be attached to the chuck 5. Each pawl exchange mechanism 19 is provided with a shift cylinder 2o provided on the frame 15 so as to be movable in the directions of arrows A and B via a guide shaft 20a. The shift cylinder 20 is provided with a shifter 21, and the shifter 21 is provided with a rod-shaped arm 22. As shown in FIG. 7, a gear 22a is partially formed in the arm 22 in the axial direction of the arm 22, and further,
A protrusion 22b is provided at the lower end of the arm 22 in FIG. Further, below the shift cylinder 20 in FIG. 3, a release cylinder 23 is provided with a release lever 23a
The release cylinder 23 is provided in such a way that it can be freely driven to protrude in the force direction, and the release cylinder 23 is provided with a lever extending over a predetermined angle in the direction of arrow E1F in FIG. Rotationally driven gear 23
b is provided. As shown in FIG. 7, the gear 23b is partially toothed in a manner corresponding to the gear 22n with which the gear 23b meshes.

Since the chuck jaw changing device 1 has the above configuration, the three jaws 1 attached to the chuck 5
2 with another jaw 12 stored in the storage ring 16, the chuck 5 is rotated to position and hold it at a predetermined jaw replacement position, and the shifter 6 is driven once in the direction of arrow C or D. to move the mask jaw 7 to a predetermined claw replacement position. Next, the cylinder 14 is made to protrude in the D direction,
The frame 15 is moved together with the storage ring 16 in the D direction until the groove 16a of the storage ring 16 is aligned with the slide groove 5e of the chuck gloss. .

When the groove 16a of the storage ring 16 and the slide groove 5e are aligned, the shift cylinders 20 of the three pawl exchange mechanisms 19 provided around the storage ring 16 are driven to move the shifter 21 together with the arm 22 in the direction B. It descends. Since the gear 22a is formed on the arm 22 in the axial direction of the arm 22, even if the arm 22 moves in the direction B, the gear 22a
The meshing between gear 23b of release cylinder 23 and gear 23b of release cylinder 23 is maintained.

Next, release the release cylinder 23. The lever 23a is driven to protrude in the B direction.

At the tip of the release lever 23a (as shown in Fig. 5,
A positioning pin 23d and a button 23c are provided,
A positioning hole 7 is provided on the master jaw 7 in a corresponding manner.
b is bored and the lock pin 11 is provided, the positioning pin 23d fits into the positioning hole 7b, and the button 23c fits into the upper end of the lock pin 11 in FIG. By moving the release lever 23a in the B direction, the lock pin 11 is pushed down in the B direction. Then, the lock pin 11 and the engagement protrusion 11
As shown in FIG. 8, the clamping rod 9, which is engaged through the cam groove 9b
The rack 9C, which had been engaged with the rack 12a of the claw 12 until then, is disengaged, and the claw 12 moves inside the slide groove 5e in the chuck 5 in the direction indicated by the arrow A.
, it becomes possible to move freely in the B direction.

On the other hand, when the release lever 2311 of the release cylinder 23 moves in the B direction, the gear 23b rotates by a predetermined angle in the direction of arrow F in FIG. 7 in conjunction with the movement, and the arm 22 also rotates in the F direction via the gear 22a. Then, the protrusion 22b also rotates in the direction F, and its tip fits into the engagement groove 12b of the claw 12.

In this state, drive the shift cylinder 20 to shift the shifter 21
When the arm 22 is raised in the entry direction, the winter melon 12 in the chuck 5 is pulled up in the A direction, that is, in the direction of the storage ring 16, and inserted into the groove 16a of the storage ring 16. Since the valley groove t6a of the storage ring 16 and the slide groove 5e of the chuck 5 are accurately aligned in phase by the positioning pin 23d of the release lever 23a,
The three claws 12 on the chuck 5 are smoothly transferred from the slide groove 5a to the groove 16a.

When the three claws 12 are stored in the predetermined storage positions of the storage ring 16 at 120° pitch, the release cylinder 23 is driven to move the release lever 23a to A.
raise it in the direction. Then, the arm 22 rotates in the E direction together with the protrusion 22b via the gear 23b1 and the gear 22n.
The protrusion 22b engages with the engagement groove 12 of the pawl 12 that had been engaged with it until then.
b is disengaged, and therefore the pawl 12 that has been pulled up into the groove 16a is held in the groove 16a as it is. Next, the indexing motor 17 is driven, and the slide groove 5e of the chuck 5 is aligned with the three grooves 168 in which the claws 12 to be attached to the chuck 5 are stored at 120° pitch.
As in the case of pulling up the claw 12, release cylinder 2
3 to release the positioning pin 23 of the release lever 23a.
Master d and Busha 23c:? -7 positioning 67
b and the tip of the lock pin 11. Then,
The slide groove 5e and the groove 16a of the storage ring 16 are aligned,
Furthermore, the clamping rod 9 is tightened by the button 23c.
moves in the C direction. Furthermore, by the movement of the release lever 23a in the B direction, the arm 22 is rotated again in the F direction via the gear 23b1 and the gear 22a, as shown in FIG. The claw 16a is fitted into the engagement groove 12b of the claw 12 to be inserted and set next.

In this state, when the shift cylinder 20 is driven to drive the shifter 21 together with the arm 2z in the B direction, the three pawls 12 are pushed into the groove 16 by the protrusion 22b.
a into the slide groove 5e of the chuck 5, and is set on the master jaw 7. The claw 12 is the slide groove 50
When the lock pin 11 is set inside, the release lever 23a is raised to release the engagement between the button 23C and the lock pin 11. Then, the clamping rod 9 is pressed and moved in the D direction by the elasticity of the coil spring 10, and the cam groove 9b
, the lock pin 11 returns to the input direction via the engagement protrusion 11a, and the rack 9C of the clamping rod 9 and the rack 12a of the claw 12 are engaged, and the claw 12 is securely inserted into the slide groove 5e of the chuck 5. Retained and fixed.

When the release lever 23a rises, the protrusion 22b rotates in the E direction as described above, the claw 12 in the slide groove 5e disengages from the engagement groove 12b, and the arm 22 rises in the A direction. It becomes possible to do so. Therefore, when the shift cylinder 20 is driven and the shifter 21 is moved in the A direction together with the arm 22, the arm 22 moves the claw 1
2 remains in chuck 5 and goes up. Therefore, when the cylinder 141e is driven to move the frame 15 backward in the C direction together with the storage ring 16, the replacement operation of the claw 12 is completed as shown in ζ.

In addition, although the above-mentioned embodiment described the case where the chuck 5 is provided with three claws 12, the number of claws provided in the chuck 5 is not limited to three, and may be provided with two, four, etc. as necessary. In that case, it is necessary to provide a number of pawl exchange mechanisms 19 equal to the number of pawls at angular positions corresponding to the relative positions of the pawls on the chuck.

(The following is a blank space) (g) 0 Effects of the Invention As explained above, according to the present invention, the storage ring 16 capable of storing a plurality of replacement claws 12 is provided around the chuck 5 and is rotatably driven. , a release cylinder 23, release lever 23a, and other means for disengaging the claw 12 from the chuck 5, and a shift cylinder 20.
, a number of pawl exchange mechanisms 19, each consisting of a transfer means for transferring the pawls 12 between the storage ring 16 such as a shifter 21 and an arm 22, and the chuck 5, are provided in a number equal to the number of pawls 12 that can be attached to the chuck 5. Therefore, it becomes possible to replace all the jaws 12 on the chuck 5 at the same time, and the time required for replacing the jaws 12 can be significantly shortened, which can contribute to substantially improving the machining efficiency of the lathe.

The jaw exchange mechanism 19 is arranged around the chuck 5, and its operating range is within a flat range, so it is more convenient than a type of device in which the jaws are exchanged by rotating a rotating arm near the headstock. Highly safe.

[Brief explanation of the drawing]

1 is a perspective view showing an embodiment of the chuck jaw changing device according to the present invention, FIG. 2 is a front view of the chuck jaw changing device of FIG. 1, and FIG. 4 is a cross-sectional view showing the engagement state between the master jaw and the pawl, and FIG. 5 is a cross-sectional view taken along the line ■-■ in FIG.
FIG. 6 is a view in the direction of the ■ arrow in FIG. 3 showing the relationship between the chuck, master jaw, and claw, FIG. 7 is a view in the direction of the ■ arrow in FIG. 3 showing the driving state of the arm, and FIG. Figure 5 ■ shows the engagement relationship between the clamping rod and the lock pin
-■ It is a cross-sectional view according to the heel. 1... Chuck jaw changing device 5... Chuck 12... Jaw 16... Storage ring 19... Jaw changing mechanism 20... Transfer means (shift cylinder) 21...・
... Transfer means (shifter) 22 ... Transfer means (arm) 23 ... Engagement release means (release cylinder) 23n ... Engagement release means (release lever) Application Person Yamazaki Iron Works Co., Ltd. η is represented by a patent attorney. Method) % formula % 2 Name of the invention Chuck jaw changing device 3 Relationship with the case of the person making the amendment Patent applicant address 1, Oaza and Koaza, Oro-cho, Niwa-gun, Aichi Prefecture Name (
Name) Yamazaki Iron Works Co., Ltd. Representative Teruhiko Yamazaki 4 Agent Address 3-12-21 Shimoai, Shinjuku-ku, Tokyo 161
No. 6? IIl Positive target details d full text? , 1llll positive content

Claims (1)

[Claims] A storage ring capable of storing a plurality of replacement jaws is provided surrounding the chuck and is rotatably driven, and a means for disengaging the jaws and the chuck, and a means for disengaging the jaws from the chuck, and a ring between the storage ring and the chuck. A chuck jaw exchanging device comprising a number of jaw exchanging mechanisms each including a transfer means for transferring the jaws, the number of which is equal to the number of jaws that can be attached to a chuck.