JPH0557529A - Wire delivery device - Google Patents

Abstract

PURPOSE:To prevent a wire from contacting a roller periphery by forming a guid surface with the rotation shaft direction middle part of a guide roller made a small diameter, and making the rotation shaft parallel to rotation surfaces of a feed roller and a pinch roller to be rotatably driven in a wire delivery direction, in a wire delivery device of a wire electric discharge working unit. CONSTITUTION:A guide surface 20, for leading a wire 2 to the middle par, is formed on a periphery of a guide roller 15, and a rotation shaft (a) is made parallel to rotation surfaces of a feed roller 5 and a pinch roller 6 to be disposed. The guide roller 15 is rotatably driven in the delivery direction of the wire 2 with a driving gear 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire discharge device for a wire electric discharge machine in which a used wire is sandwiched between a feed roller and a pinch roller to be sent out and dropped into a wire recovery box as it is.

[0002]

2. Description of the Related Art As a method of collecting used wires in a wire electric discharge machine, there is a method of dropping used wires, which are sent out by being sandwiched between a feed roller and a pinch roller, into a wire recovery box as they are.
This product is convenient because it does not require a wire collection reel or its drive and can collect a large amount at one time, but the used wire sent out from the feed roller and pinch roller can be collected until it is stored in the collection box. Bounce around, supporting parts of feed roller and pinch roller,
Alternatively, it contacts the column surface of the wire electric discharge machine.
Then, since the surface of the used wire is rough, the paint at the contact point is scraped off, scratches are made on the smooth metal surface, and if it repeats, the appearance around the feed roller and pinch roller will be poor. I will make it a thing.

[0003]

DISCLOSURE OF THE INVENTION The present invention, in a wire electric discharge machine using a wire recovery box, properly guides a used wire which is sent out by being sandwiched between a feed roller and a pinch roller, and the wire is properly guided by these rollers. An object of the present invention is to provide a wire feeding device capable of preventing contact with the periphery.

[0004]

A wire feeding direction by a feed roller and a pinch roller is upward. A guide roller is provided in front of the upper part of these rollers at intervals. The guide roller has a shape in which the central portion of the peripheral surface in the direction of the rotation axis is lowered to form a guide portion, and the rotation axis is arranged parallel to the rotation surfaces of the feed roller and the pinch roller. By providing a drive device for the guide roller,
The upper surface of this roller is rotated so as to move in the wire feeding direction.

[0005]

With the structure in which the wire feeding direction by the feed roller and the pinch roller is upward, the contact between the fed wire and the guide roller is secured.

The guide roller restrains the wire from moving and promotes the delivery.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 schematically shows the entire wire electric discharge machining apparatus 1 centering on the path of a wire 2. Wire 2
Is pulled out from the wire supply reel 4 arranged on the wall surface of the column 3 by being sandwiched between the feed roller 5 at the end of the path and the pinch roller 6 thereof, and on the way, the brake roller 7, the upper guide roller 8, the upper nozzle 9, and the workpiece. A wire path is configured through 10, the lower nozzle 11, and the lower guide roller 12. The brake roller 7 applies a predetermined braking force to the pull-out by the feed roller 5 to give the wire 2 passing through the work 10 part a tension necessary for processing. At the location of the work 10, a cutting process is performed by arc discharge between the wire 2 as one electrode and the work 10 as the other electrode, and the work 10 is processed into a predetermined shape. Wire 2 that passed through the work 10
The (used wire) has many fine irregularities on the surface as a result of the electric discharge machining.

The feed roller 5 is driven and rotated with its rotating surface parallel to the wall surface of the column 3, and the pinch roller 6 has an arm 1 whose one end is pivotally supported on the wall surface 13.
The other end of 4 is rotatably supported, and its rotation surface is flush with the feed roller 5. The pinch roller 6 can be separated from the feed roller 5 by rotating the arm 14 when setting the wire 2. After the wire 2 is set, it is constantly urged toward the feed roller 5 by a spring attached to the arm 14,
The peripheral surface is pressed against the peripheral surface of the feed roller 5.

The wire feeding device 1 includes the feed roller 5, the pinch roller 6, the guide roller 15 arranged in front of the upper portion of the feed roller 5, and the driving device 16 (FIGS. 1 and 2) thereof.
7 are configured. The guide roller 15 is rotatably supported by pivotally supporting both ends of the rotary shaft a to the tip portions of stays 19 and 19 projecting from the mounting machine frame 18, and the peripheral surface of the rotary shaft a.
The diameter is smoothly reduced so that the central portion becomes lower in the direction of, and the shape is generally drum-shaped. As a result, the peripheral surface of the guide roller 15 serves as a guide surface 20 for guiding the wire 2 to the center of the guide roller 15. Further, the rotation axis a of the guide roller 15 is arranged parallel to the rotation surfaces of the feed roller 5 and the pinch roller 6 as shown in the figure. In this embodiment, the driving device 16 includes an air nozzle 21 fixed to a mounting frame and a rotary wing 2 fixed to a side surface of the guide roller 15 coaxially with the rotation axis a.
It consists of two. The blowing direction of the air nozzle 21 is directed to the upper half of the rotary vane 22. This is to make the rotation direction of the guide roller 15 coincide with the feeding direction of the wire 2 on the upper surface side. Then, by fixing the mounting plate 18 to the wall surface of the column 3 above the feed roller 5 and the pinch roller 6, the guide roller 15 together with the drive device 16 thereof, the wire feeding side of the feed roller 5 and the pinch roller 6, That is, they are arranged in the front of the upper part with a space.

When the wire electric discharge machine 1 is operated and the cutting process is started, the wire 2 is pulled out from the wire supply reel 4, moves along the wire path, and finally reaches the feed roller 5 and the pinch roller 6. It is sandwiched and sent out as the used wire 2. Then, the wire 2 that has been fed out high falls down forward due to its own weight and contacts the peripheral surface of the guide roller 15 (FIG. 2). Since the center of the peripheral surface of the guide roller 15 is formed as a guide surface 20 having a small diameter, the wire 2 slides down to the center of the guide roller 15 and is regulated at an appropriate position. Further, at this time, the guide roller 15 is rotated in the feeding direction at the portion where the wire 2 is in contact, so that the feeding of the wire 2 is promoted.
Further, the wire 2 is prevented from moving as a synergistic effect of the function of regulating this position and the function of promoting the delivery.

The above is an embodiment. Guide roller 1
The drive device of 5 is not limited to the air nozzle 21 and the rotary vane 22,
It may be a small electric motor. However, in the case of the embodiment, the structure is simple so that the wire 2 is not forcibly delivered, and the rotary vane 22 is always blown with air without providing a special control device for the drive device 16. There is an advantage that no particular trouble occurs even in the state. On the contrary, when the traveling of the wire 2 is stopped, such as when the wire is broken, the operation of the drive device 16 may be stopped in conjunction.

[0012]

EFFECTS OF THE INVENTION There is no wire bouncing between the feeding position of the used wire by the feed roller and the pinch roller and the wire collection box. As a result, the state where the feed roller, the pinch roller, and the periphery thereof are not scratched is eliminated, and the appearance is not spoiled.

[Brief description of drawings]

FIG. 1 is a side view.

FIG. 2 is a front view.

FIG. 3 is a schematic front view.

[Explanation of symbols]

1 Wire Electric Discharge Machine 2 Wire 3 Column 4 Wire Supply Reel 5 Feed Roller 6 Pinch Roller 15 Guide Roller 16 Drive Device 17 Wire Feeding Device

Claims (1)

[Claims] 1. A structure in which a guide roller is provided in front of an upper portion of a feed roller and a pinch roller whose wire feeding direction is upward, and the guide roller has a small diameter in a central portion in a rotation axis direction. Has a guide surface,
A drive device is provided which has its rotation axis parallel to the rotation surfaces of the feed roller and the pinch roller, and which rotates the guide roller so that the upper surface side of the guide roller moves in the wire feeding direction. Wire feeding device in the wire electric discharge machine.