JPS6228108A - Cutting method for lead in lead cut robot - Google Patents

Abstract

PURPOSE:To apply cutting force of cutting edges to efficiently and sufficiently act on a material to be cut, by pressing the cutting edges in the center direction and cutting the almost column-shaped material to be cut like a lead while the cutting edges are rotated in the peripheral direction of the material to be cut. CONSTITUTION:A cutter part main unit 20, rotating its cutters 30, 31 by a motor 26, turns cutting edges 302, 312 of said cutters in the peripheral direction about a driving shaft serving as the center. The main unit, closing the cutting edges 302, 312 mutually in the center direction simultaneously with their rotation, performs cutting action of a lead (material to be cut) 141. The main unit 20, meshing the cutting edges to be turned around in the peripheral direction of the lead 141 so as to enable it to be cut by the cutting edge while its direction is changed for the lead, easily cuts the lead even if it is in a large diameter or of hard material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for cutting a lead in a robot.

Conventional technology When mounting a component with leads on a printed circuit board, the long leads of the component are inserted into the board, soldered, and then the remaining leads protruding from the back side of the printed circuit board are removed. The long part is cut and removed to make the length even.

Currently, this full-length lead cutting work is automatically performed by a lead cutting robot. This lead cut robot is generally configured with an air nipper provided at one end of the robot arm. Air-12 sobers generally have a structure in which a pair of opposing cutting blades are moved in the direction of blowing the lead into each other to cut the lead.

Problems to be Solved by the Invention As described above, when a lead cutting robot performs numerically controlled lead cutting, the cutting of the lead is frequently performed at approximately the same position of the cutting blade. As a result, the cutting blade is significantly worn and damaged, resulting in a short tool life. When the cutting blade wears out, depending on the degree of wear, it becomes difficult to cut the lead, and this may cause cutting leakage, which causes the lead to be moved to the next cutting operation without being completely cut. This tends to occur with leads having a large diameter or relatively hard leads depending on the material. Furthermore, such reeds are difficult to cut and require a stronger sword than normal reeds. Therefore, as a general method, the cutting operation is repeated several times or the cutting direction or angle is changed.

However, in this direction, the problem arises that cutting takes time and the total time required for cutting becomes longer.

Alternatively, a method of increasing the cutting force may be considered, but meshing the cutting blades with more force than necessary may cause damage to the cutting blades, which is not good for the cutting blades.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a lead cutting method that allows easy cutting with an appropriate cutting force.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a method for rotating a cutting blade in the circumferential direction of a substantially cylindrical material to be cut, such as a reed, while rotating the cutting blade in the direction of the center of the material to be cut. Characterized by pressing, ru.

According to the present invention described above, since the cutting operation of the cutting blade on the material to be cut is performed while rotating the cutting blade in the circumferential direction of the material to be cut, the cutting force of the cutting blade can be efficiently applied to the material to be cut. It can be used with sufficient strength.

In the following, implementation of the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view showing the basic structure of a lead force sorting robot according to the present invention, and FIG. 2 is a side sectional view showing an example of the structure of a part of the cutter. The method of the present invention is carried out by a cantenogrobot having such a configuration.

In FIG. 1 and FIG. 2Q, the TOHO bot arm 20 indicates a portion of the cutter body.

Robot arm 10! d. Extends from the drive unit l-11 and is driven in any direction. At the tip of the robot arm 10, a part of the cutter main body 2o is supported vertically downward. The cutter part main body 2o is one of the percent movement units 11.
Due to the return force, while being vertically supported via the robot arm 10, it is moved in the X-Y directions on a desired plane such as a work table, and is also moved up and down. The moving operation of the cutter partial main body 20 is controlled by the control unit 12.The positioning control operation of the printed circuit board 14 is carried out on the line 13 and is positioned and fixed at a predetermined working position 13A. Lead 141... Protruding vertical position

An air cylinder consisting of a cutter part body 20vC'a for cutting the leads 141, a cylinder 21, and a piston 22 mounted on the cylinder 21 so as to be vertically movable is provided. This air cylinder has an upper pipe 2 that pumps air to move the piston 22 downward.
3 and a lower pipe 24 for upward movement. Air that moves the piston 22 up and down is sent under pressure from a compressor (not shown) through a pipe, and the solenoid valve 2
The upper pipe 23 and the lower pipe 24 are opened and closed by the opening/closing control of 5.
The pressure feeding is switched at a certain timing.

The piston 22 has a generally cylindrical shape with a hollow portion 221 formed in the direction of its central axis, and has a conical inclined surface 22 at its lower end.
2 is formed.

On the other hand, a drive motor 26 is mounted on the upper part of the cutter main body 20.
is completely attached. , a small moving shaft 27 of the drive motor 26,
It protrudes further downward from the piston 22 through the hollow part 221 of the piston 22 described above. A metal fitting 28 is attached to the lower end of the drive shaft 27.The metal fitting 28 is attached to the lower end of the drive shaft 27. A support shaft 29 is provided in a direction perpendicular to the drive shaft 27.The support shaft 29 has 1.
A pair of cutters 3 symmetrical about the drive shaft 27
031 is attached. Cutter 30.31 is
Each intermediate portion is made to protrude inward, and the protruding end is connected to the support end 2.
9, they are configured in a substantially H-shape and are mutually rotatably supported. ℃, the cutters 30 and 31 each have a spring 3 attached to the shaft 29 in the direction of opening their lower ends and closing their upper ends.
It is energized by 21L. Followers 301 and 311 are provided at the upper ends of the cutters 30 and 31, respectively, and are in contact with the lower end inclined surface 222 of the piston 22. This allows the upper end of the cutter 30.31 to move smoothly in the inclined direction and circumferential direction relative to the inclined surface 222 of the piston 22. -f: then cutter 3
The lower end of 0.31 can be engaged with each other facing each other! ;1
．． FJs 302 and 312 are formed at each location.

By configuring the cutter partial body 20 as described above, the cutter 30.31 is rotated by the upward movement of the drive motor 26, and its cutting blade 302° 312 is rotated by the 5-coupling shaft 2.
7 in the circumferential direction. At the same time as this rotation, the upper end 301 of the cutter is caused by the downward movement of the piston 22.
．． 311 is pushed out and the cutting blades 302, 3 at the lower end
12 close toward each other toward the center to perform the cutting operation. When the piston 22 is moved upward, due to the biasing force of the spring 32,
The cutting blades 302, 312 return to their original open state. Next, a lead cutting operation according to the method of this embodiment using the above-mentioned apparatus will be explained.

First, the printed circuit board 14 on which components have been mounted and soldering has been completed is placed on the line 13 and transported to a predetermined working position 13A1, where it is positioned and fixed.

Thereafter, in response to a command from the control unit 12, the ringing unit 11 is driven, and a part of the cutter main body 20 is arbitrarily moved via the robot arm 10. Then, the third
As shown in the figure, the center of the cutter partial body 20d is
First, it is located on the center line of the slide 141 to be cut and stopped. Then, at that position, part of the cutter body 20
moves downward to a position where the cutting blades 302 and 312 face the cutting position of the lead 141 and then stops.

In this state, as shown in FIG.
Cutting the lead] 41 is performed while rotating the lead. For example, in a cutting operation in which the cutting blades 302 and 312 sandwich the lead 141 and the blades 302 and 312 engage with each other, the cutting blades 302 and 312 are caused to rotate once in the circumferential direction of the lead 141. In other words, the cutters 30 and 31 are rotated once by the drive motor 26. Then, the lead can be cut while changing the direction of the cutting blades 302, 312 with respect to the lead. Therefore, even if the lead has a large diameter or is made of a hard material, it can be easily cut with an appropriate cutting force.

When the cutting of the first glue 141 is completed, the rotation of the cutters 30 and 31 is stopped, and at the same time the cutting blade 30
2,312 MyoS opens, and part of the cutter body 20 moves upward.

Thereafter, the cutter part body 20 is then cut by the cutter part 14.
1, and the leads of the printed circuit board 14 are sequentially cut in the same manner as described above. When all the leads on the printed circuit board 14 have been cut, the printed circuit board 14 whose leads have been cut is discharged along the line 13, and at the same time, the next printed circuit board 14 is positioned at the working position 13A. In this way, the same type of printed circuit boards 14 and
Leads 141... are cut with respect to C.

In the above embodiment, the cutting blades 302 and 312 are moved one time in the circumferential direction of the lead for one lead cutting operation.
Although the cutters 30 and 31 are rotated several times in one cutting operation, the cutters 30 and 31 may be rotated several times. This will further improve the cutting efficiency.

In the example, the cutting blades are provided as a pair facing each other, but if the material to be cut is made of a material that is difficult to deform plastically or elastically, it can be made up of only a single cutting blade. Even if there is, it can be cut.

Furthermore, if the cutting blades are shaped so that they can engage with each other, a configuration having a plurality of blades may be used.

Moreover, the material to be cut is not limited to the above-mentioned leads, but can be widely applied to materials having the same or similar structure.

As described in detail of the invention, according to the lead force tensioning method of the present invention, the cutting operation can be easily performed with an appropriate cutting force without being greatly affected by the diameter, hardness of the material, etc. cutting time can be shortened.

In addition, the load on the cutting blade is reduced, smooth cutting operation is possible, and the life of the cutting blade itself can be extended.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a lead cutting robot applied to the method of the present invention, and FIG. 2 is a side cross-sectional view showing an example of the structure of a part of the cutter body for carrying out the cutting method according to the present invention. FIGS. 3, 4, and 4 are diagrams showing the cutting operation of the leads of the printed circuit board. DESCRIPTION OF SYMBOLS 10... Robot arm, 11... Drive unit, 12... Control unit, 20... Cutter part body, 21... Nlinda, 22... ... Piston, 26 ... Drive motor, 30.31 ... Cutter, 302.313 ... Cutting blade, 14 ... Printed circuit board, 141・・・・・・ Lead (material to be cut). Figure 1 1.5 Figure 3

Claims (2)

[Claims] (1) A method for cutting a lead in a lead cutting robot, which comprises rotating a cutting blade in the circumferential direction of a substantially cylindrical material to be cut, such as a reed, and pressing the cutting blade toward the center of the material. (2) The cutting method according to claim (1), characterized in that the cutting process is performed with a pair of cutting blades facing each other while sandwiching the material to be cut.