JPH0994703A - Bar feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly feed a bar in a bar feeder. SOLUTION: This bar feeder is constituted so that a pushing rod can be forwarded or retreated along the feeding direction of a bar, by arranging pushing rod 2 for a bar 1 slidably along the feeding direction of the bar, and by arranging a guiding member 3, having a spiral groove 3a, rotatably in parallel to the pushing rod to engage it with the spiral groove of the guiding member via an engaging member 4 to rotate the guiding member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar material feeder for supplying a bar material to a machine tool such as a lathe.

[0002]

2. Description of the Related Art A bar feeder is one in which a long bar is continuously fed to a machine tool such as an NC lathe, and the feeding method uses a chain, a wire, a belt or a roller. It has been known. That is, when using a chain, a wire, a belt or the like, the push rod is driven by them, and the rod material is pushed out to the machine tool side by the tip of the push rod. When a roller or the like is used, the bar material is sandwiched by a plurality of rollers and one of the rollers is driven to send the bar material to the machine tool side.

[0003]

However, in the conventional feeding method, looseness of chains, wires, belts, etc.,
There is a problem in that the control of the feed amount of the bar becomes incomplete due to elongation and slip between the roller and the bar and the like.

It is an object of the present invention to provide a bar feeding device for a bar feeder which can solve such a problem.

[0005]

In order to achieve the above object, the invention of claim 1 is such that the push rod 2 of the rod 1 is slidably arranged along the feed direction of the rod 1, and the spiral groove 3a is formed. A guide member 3 having is arranged rotatably in parallel with the push rod 2.
The push rod 2 is engaged with the spiral groove 3a of the guide member 3 via the engaging member 4, and the push rod 2 is advanced along the feeding direction of the rod 1 by the rotation of the guide member 3. Alternatively, the configuration of a bar material feeder configured to retract is adopted, and the invention of claim 2 is such that the guide member 3 is composed of a spiral body, and the push rod 2 is slidable in a center hole 3b of the spiral body. According to the invention of claim 3, an oil receiver is provided around the guide member 3, and the guide member 3 comes into contact with the inside of the oil receiver. According to the second aspect of the present invention, the configuration of the bar feeder in which the oil 23 that can be used is contained is adopted.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. This bar feeder is shown in FIGS.
2, the push rod 2 of the rod 1 is slidably arranged along the feed direction of the rod 1, and the guide member 3 having the spiral groove 3a is rotatably arranged parallel to the push rod 2. Then, the push rod 2 is engaged with the spiral groove 3a of the guide member 3 through the engaging member 4, and the guide rod 3 is rotated to move the push rod 2 along the feed direction of the rod 1. It is configured to move forward or backward.

The push rod 2 of the rod 1 is a member made of a solid round rod, which is arranged horizontally in the rod feeder and has a front end for holding the rear end of the rod 1. The gripper 5 is rotatably connected to the push rod 2 via a bearing 6. Therefore, when the bar 1 is gripped by the main shaft of an NC lathe or the like (not shown) arranged in the right direction in FIG. 1 at the tip thereof and rotates with the rotation of the main shaft, the gripper 5 is held by the tip of the push rod 2 together with the bar 1. It will rotate while being played.

The guide member 3 is specifically constituted by a spiral body, and more specifically, it is formed by winding a strip-shaped plate material in the form of a coil spring and is horizontally arranged in the bar material feeder. It is arranged. The push rod 2 is slidably inserted into the center hole 3b of the spiral body. Since the center hole 3b penetrates the spiral body forward and backward, the push rod 2 can reciprocate between the front and rear ends of the spiral body.

The guide member 3 is rotatably inserted in a cylindrical case 7 which is horizontally fixed to a machine frame (not shown) of the bar feeder. That is, the rear end of the guide member 3 is fixed to the drive shaft 8 by welding or the like, and the drive shaft 8 is driven by the motor 11 via the pulleys 9a and 9b and the belt 10. The motor 11 is fixed to the case 7 via a bracket 12, and its rotation speed and rotation direction are controlled by a control device (not shown). Also,
The drive shaft 8 is supported at the rear end of the case 7 via a radial bearing 13, a thrust bearing 14, and a bearing case 15, and the front end of the guide member 3 includes an inner cylindrical body 16 that holds the front end from the periphery thereof. It is supported at the front end of the case 7 via an outer cylindrical body 17 that holds the inner cylindrical body 16 from the periphery thereof. Further, if necessary, inside the case 7, receiving members 18 for supporting the middle of the guide member 3 are provided at one place or a plurality of places. The receiving member 18 can also be formed in an elongated shape extending over substantially the entire length of the guide member 3. The receiving member 18 is a sliding bearing body with which the outer peripheral surface of the guide member 3 can come into contact, and is supported on the inner wall surface of the case 7 via an elastic body 19 such as an O-ring made of rubber or urethane or a sheet. The elastic body 19 can absorb the vibration when the bar 1 rotates.

The engaging member 4 is specifically a pin, and a screw 20 is provided at one end thereof, and a roller 21 is rotatably covered at the other end. The engagement member 4 is fixed to the push rod 2 by screwing the screw 20 into the push rod 2 from the side surface, and the roller 21 is fixed to the spiral groove 3 of the guide member 3.
The guide member 3 is engaged by being inserted into a. The upper end of the roller 21 of the engaging member 4 is inserted between the two rail-shaped guide bodies 22 provided in the case 7. Specifically, the guide body 22 is fixed on a flat surface formed by cutting out the receiving member 18 in a horizontal plane. The guide body 22 connects the plurality of receiving members 18 to each other, and both ends thereof are connected and fixed to the bearing case 15 and the inner cylindrical body 16. As a result, when the guide member 3 is rotated in any direction at a fixed position in the case 7, the engaging member 4 is constrained by both the spiral groove 3a of the guide member 3 and the guide body 22. 2 moves forward or backward in the center hole 3b of the guide member 3.

An oil receiver is provided around the guide member 3, and an oil 23 which can contact the guide member 3 is placed in the oil receiver. Specifically, the case 7 also serves as an oil receiver, and an O-ring 24 is provided between the case 7 and the bearing case 15 so as to prevent the oil 23 from leaking out of the case 7. It is provided. The oil 23 is injected into the case 7 at such a level that it comes into contact with the lower side of the guide member 3, and as the guide member 3 rotates, it adheres to the surface of the guide member 3 and is drawn out. Part of it adheres to the surface of the rod 1 and reaches the inside of the outer cylindrical body 17. In the cavity 17 a of the outer cylindrical body 17, the oil 23 together with the bar 1 is placed in the case 7
A scraper 25 for wiping the surface of the bar 1 is provided to prevent the bar 1 from coming out. Further, in order to return the oil 23 scraped by the scraper 25 to the inside of the case 7, a return path 26 for the oil 23 including a gap and a hole is formed between the outer cylindrical body 17 and the inner cylindrical body 16. There is. Further, the receiving member 18 is formed with a through hole 27 for the oil 23 in order to make the level of the oil 23 in the case 7 constant over the entire length of the case 7.

An oil recovery box 28 is attached to the tip of the case 7 so as to cover the opening of the case 7.
The oil that passes through the scraper 25 and drops from the bar 1 is collected by the oil collecting box 28.

Next, the operation of the bar feeder will be described. First, the bar 1 is inserted into the case 7 from the tip of the case 7, passed through the center hole 3b of the guide member 3, and the rear end of the bar 1 is gripped by the gripper 5. Next, the motor 11 is rotated by a predetermined number of rotations under the control of the control device, and the guide member 3 is rotated in a predetermined direction by a predetermined number of rotations. The engaging member 4 is constrained by both the spiral groove 3a that makes a turning motion and the linear groove 22a of the guide body 22, and moves forward in the case 7 by a predetermined distance. Therefore, the push rod 2 also advances in the center hole 3b of the guide member 3 by the same distance, and feeds the rod 1 gripped by the gripper 5 toward the spindle of the machine tool by a certain length. The machine tool grips and rotates the bar 1 with its spindle and cuts it with a blade.

At this time, the oil 23 is scraped up by the guide member 3 and reaches between the center hole 3b of the guide member 3 and the bar member 1 to lubricate them. The oil 23 adhering to the surface of the bar 1 moves forward together with the bar 1, but the oil is scraped off by the scraper 25 and is returned to the case 7 from the return path 26.
Will be back inside.

When the predetermined cutting is completed, the motor 11 further rotates by the above-mentioned number of revolutions, the bar 1 is sent to the machine tool, and the machine tool cuts the tip of the bar 1. When such processing is repeated and the bar 1 is consumed, the motor 11 reversely rotates, the push bar 2 retracts, and a new bar 1 is inserted into the case 7 and then moved forward again. To do.

In the above embodiment, the push rod 2 and the rod 1 are constructed so as to pass through the guide member 3.
It is also possible to pass outside the guide member 3. In that case, the guide member 3 may be solid rather than hollow with the central hole 3b.

[0017]

According to the invention of claim 1, the push rod of the rod is slidably arranged along the feed direction of the rod, and the guide member having the spiral groove is rotatable parallel to the push rod. And the push rod is engaged with the spiral groove of the guide member via an engaging member, and the push rod moves forward or backward along the feed direction of the rod member by rotating the guide member. Since it is configured as described above, it is possible to accurately perform the feed amount of the bar material and improve the processing accuracy.

According to the second aspect of the present invention, since the guide member is formed of a spiral body and the push rod is slidably inserted into the center hole of the spiral body, a space for installing the guide member and the push rod is provided. It can be integrated to save space, and when the rigidity of the spiral body is reduced and elasticity is given, when the push rod is impacted when the rod is supplied, the impact is damped by its damper effect. It is possible to absorb and improve the processing accuracy of the bar material.

According to the third aspect of the present invention, the oil receiver is provided around the guide member, and the oil with which the guide member can contact is put in the oil receiver. It is possible to reduce the vibration of the bar material by supplying it to the bar material and smooth the rotation of the bar material, and to further improve the machining accuracy in combination with the accurate feeding of the bar material by the spiral body.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view of a main part of a bar feeder according to the present invention.

FIG. 2 is an enlarged view of a rear portion in FIG.

FIG. 3 is an enlarged view of a front portion in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 2;

FIG. 5 is a sectional view taken along line VV in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bar material 2 ... Push rod 3 ... Guide member 3a ... Spiral groove 4 ... Engaging member 3b ... Center hole of a spiral body 23 ... Oil

Claims (3)

[Claims] 1. A push rod of a rod is slidably arranged along a feed direction of the rod, a guide member having a spiral groove is rotatably arranged parallel to the push rod, and the push rod is It is configured to be engaged with the spiral groove of the guide member via an engaging member, and the push rod is configured to be advanced or retracted along the feed direction of the rod member by rotating the guide member. A bar feeder. 2. The rod material feeder according to claim 1, wherein the guide member is formed of a spiral body, and the push rod is slidably inserted into a center hole of the spiral body. 3. The bar feeder according to claim 2, wherein an oil receiver is provided around the guide member, and oil which can contact the guide member is put in the oil receiver.