JPH0357362Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a finger chuck fixing device for a bar feeder, and in particular, it is located at the tip of the feed pipe of the bar feeder to secure the rear end of the bar. This invention relates to a fixing device for fixing a finger chuck for gripping to a feed pipe.

[Conventional technology]

The bar feeder feeds the bar into the main shaft of a processing machine such as a lathe, and also rotatably supports the bar that rotates at high speed during processing. A finger chuck is attached and fixed to the tip of the feed pipe for gripping.

Conventionally, in order to attach and fix a finger chuck to the tip of a feed pipe, as shown in FIG.
The spindle 21 is provided with a pin hole 21a, the finger chuck 22 is provided with a screw hole 22a, and the pin screw 2 is inserted into the screw hole 22a.
3 and the pin 23a is fitted into the pin hole 21a.

[Problem that the invention attempts to solve]

However, in the finger chuck fixing device having such a structure, when the bar rotates during processing, this rotation is transmitted from the finger chuck 22 to the spindle 21 via the pin screw 23. Therefore, a large frictional force acts between the outer peripheral surface of the pin 23a of the pin screw 23 and the inner peripheral surface of the pin hole 21a of the spindle 21 during rotation of the bar. Therefore, the above pin 2
There is a problem in that wear occurs on both or one of the pin hole 3a and the pin hole 21a, causing backlash between them. In addition, sometimes a strong force acts on the bar during driving, and this force is transmitted to the pin hole 21 through the pin 23a.
In some cases, the diameter of the pin hole 21a is enlarged by directly joining the pin hole 21a. In addition, when the pin screw 23 is screwed into the finger chuck, if the pin hole 21a of the spindle 21 and the pin 23a of the pin screw 23 are not accurately aligned, the pin hole 21a may be partially damaged. In some cases, the pin 23a rubs strongly and rattles may occur. Due to the backlash that occurs between the pin 23a and the pin hole 21a due to these reasons, the finger chuck and spindle cannot be firmly fixed, which causes center runout of the bar material and prevents normal machining. There is.

This idea was devised in view of the above circumstances.
The purpose is to provide a finger chuck fixing device that can firmly fix the spindle and finger chuck provided at the tip of the feed pipe and can withstand long-term use. .

[Means for solving problems]

In order to solve the above problems, the present invention provides a finger chuck fixing part having an inclined surface with a small diameter on the tip side on the spindle attached to the tip of the feed pipe of a bar feeder, and the finger chuck fixing part has a small diameter on the tip side. An outer ring having a corresponding inner surface and configured to be expandable in diameter is fitted onto the outside, a driving member is provided on the fixed part to move the outer ring along the axial direction of the fixed part, and a finger chuck is attached to the outer ring. The device is characterized in that the finger chuck is closely fixed to the fixing portion by moving the outer ring using the driving member and expanding the diameter of the outer ring.

[Effect]

An outer ring having an inner surface corresponding to the tapered surface of this fixing part is fitted onto the tapered finger chuck fixing part of the spindle attached to the tip of the feed pipe of the bar feeder, and then an outer ring is fitted onto the outer ring. The finger chuck is mounted on the exterior and the outer ring is moved along the axial direction of the fixing part by a driving member, and the diameter of the outer ring is expanded to tightly fix the finger chuck to the fixing part via the outer ring. can do.

[Example of idea]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a finger chuck fixing device for a bar feeder according to the present invention will be described below with reference to FIGS. 1 to 5.

Fig. 1 is a plan view of a feed pipe 1 that feeds a bar into the main shaft of a lathe and rotatably supports the bar rotating at high speed.
and are each supported by a support 3 at the front thereof. Connecting plates 4 and 5 are fixed to the supports 2 and 3, respectively.

In addition, there is a sleeve 6 at the tip of the feed pipe 1.
is screwed onto the sleeve 6, and a bearing 7 that rotatably supports the spindle 11 is accommodated within the sleeve 6. A finger chuck 8 is attached and fixed to the tip of this spindle 11, and this attachment and fixation is performed by a finger chuck fixing device 10, as shown in FIG. That is, the finger chuck fixing device 10
As shown in detail in FIG. 2, the spindle 11 is rotatably supported within the bearing 7, and the finger chuck fixing portion 12 of the spindle 11.
The bolt 15 constitutes a driving member that moves the outer ring 13 along the axial direction of the fixed portion. The finger chuck fixing portion 12 at the tip of the spindle has an inclined surface 12a with a smaller diameter on the tip side, and a female screw 12b is threaded in the center thereof. Further, the outer ring 13 is divided into two divided pieces 13A and 1, as detailed diagrams thereof are shown in FIGS. 3 to 5.
3B, each of these divided pieces 1
3A and 13B each have an inclined inner surface 13a corresponding to the inclined surface 12a of the fixing portion 12, and a slit 13s in the center thereof. Note that these divided pieces 13A and 13B are integrated by interposing an O-ring 14 in a groove 13b formed on the outer periphery thereof. On the other hand, the head of the bolt 15 as a driving member for moving the outer ring 13 toward the rear end along the axial direction of the spindle 11 has a hexagonal hole 15a (indicated by a broken line) for rotating the bolt 15. is formed.

Next, the operation of the finger chuck fixing device constructed as described above will be explained.

First, the outer ring 13 is fitted onto the finger chuck fixing portion 12 of the spindle 11, and the bolts 15 are temporarily tightened to the extent that the outer ring 13 does not come off.

Next, the finger chuck 8 is mounted on the outer ring 13. A sleeve 9 is press-fitted into the fixed portion of the finger chuck 8, and the inner surface of the sleeve 9 is smooth so as to come into close contact with the outer surface of the outer ring 13. After the finger chuck 8 is mounted on the outer ring 13, the hexagonal hole 1 of the bolt 15 is
When a hexagonal wrench or the like is inserted into 5a and the bolt 15 is tightened, the outer ring 13 moves forward along the axial direction of the spindle 11. Along with this, the diameter of the outer ring 13 is expanded, and the inner surface of the sleeve 9 and the outer surface of the outer ring 13 come into contact with each other, and when the bolt 15 is further tightened, the diameter of the outer ring 13 is further expanded, and the diameter of the outer ring 13 is expanded, and ring 13
and are tightly fixed. On the other hand, it is also closely fixed to the inclined inner surface 13a of the outer ring 13 and the inclined outer surface 12a of the spindle 11. As a result, the finger chuck 8 is firmly fixed to the fixed portion 12 of the spindle 11 via the outer ring 13.

[Effects of the Invention] As is clear from the description of the embodiments, according to the present invention, the finger is attached to the finger chuck fixing portion of the spindle provided at the tip of the feed pipe by surface contact via the outer ring. The chuck can be firmly fixed, and no loosening or rattling will occur between the spindle and the finger chuck during processing of bar materials, etc. Therefore, it is possible to prevent the bar material from causing center runout or the like during processing.

[Brief explanation of drawings]

Fig. 1 is a plan view of a feed pipe using the finger chuck fixing device according to the present invention, and Fig. 2 is an enlarged sectional view of the same finger chuck fixing device.
Fig. 3 is a partially cutaway front view of the outer ring of the finger chuck fixing device, Fig. 4 is a plan view of the outer ring, Fig. 5 is a side view of the outer ring, and Fig. 6 is a conventional fender. FIG. 3 is a partially cutaway sectional view of the swinger chuck fixing device. 1...Feed pipe, 7...Bearing, 8...Finger chuck, 9...Sleeve, 11...Spindle, 12...Finger chuck fixing part, 1
3...Outer ring, 14...O ring, 15
……bolt.

Claims (1)

[Scope of utility model registration request] The spindle attached to the tip of the feed pipe of a bar feeder is provided with a finger chuck fixing part having an inclined surface with a smaller diameter on the tip side, and the fixing part has an inner surface corresponding to the inclined surface and can be freely expanded in diameter. A driving member is provided on the fixed part to move the outer ring along the axial direction of the fixed part, a finger chuck is mounted on the outer ring, and the driving member causes the outer ring to move as shown in FIG. 1. A finger chuck fixing device for a bar feeder, characterized in that the finger chuck is tightly fixed to the fixing part by moving the outer ring and expanding the diameter of the outer ring.