JPH0252395B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a crimp-release mechanism for a crimp terminal that releases the crimp-bonded terminal from a crimp die when the terminal is crimp-bonded to an electric wire.

``Prior Art'' Conventionally, in order to crimp a terminal to an electric wire on an automatic wire processing line, etc., an upper die crimper 5 that moves up and down is placed above a fixed lower die anvil 6 as shown in Fig. 5. At the same time, the terminal 2 having the crimping piece 3 is supplied onto the anvil 6, and the end of the electric wire 1 held by the wire conveying chuck 4 is sent out above the terminal 2, and the crimper 5 is lowered to crimp the terminal 2. It consists of a structure. However, since the crimper 5 forcibly fits the U-shaped crimping piece 3 into its own V-shaped groove and plastically deforms the crimping piece 3 for crimping, the terminal 2 bites into the crimper 5 that rises after the crimping process. There is a phenomenon that continues to rise. In the figure, 5' and 6' are crimping pieces for the covered wire portion, and 5'' and 6'' are a crimper and anvil for crimping the crimping pieces for the bare wire portion, respectively.

Therefore, in order to prevent this defective phenomenon, a mold release member 7 is fixedly provided above the terminal 2 on the anvil 6, and as shown in FIG. Means is taken to cause the terminal 2 to come into contact with the crimper 7 and release the terminal 2 from the crimper 5.

"Problems to be Solved by the Invention" According to the above-mentioned prior art, there is a head difference between the feeding position of the electric wire 1 and the crimping piece 3, and the electric wire 1 is bent and crimped by the amount of the head difference, and is separated. During molding, the terminal 2 becomes inclined due to the pulling resistance from the crimper 5 and the contact with the mold release member 7, as shown in FIG. 5C, causing the electric wire 1 near the terminal 2 to be bent severely. Therefore, after the terminal 2 is crimped, the electric wire 1 remains bent and has a bent neck shape. In addition, the above-mentioned bent electric wire becomes an important cause of process trouble in the automatic processing process after terminal crimping, and obstructs automation of the process.

An object of the present invention is to provide a novel press-release mechanism that solves the above-mentioned conventional problems.

``Means for Solving the Problems'' The present invention, which achieves the above objects, has a ``fixed lower die anvil and an upper die crimper attached to a vertically movable slide body, Therefore, in the terminal crimping machine for crimping the terminal on the anvil to the electric wire, the underframe to which the anvil is attached has a wire holding device which is elastically attached to the base frame so as to be able to descend freely, and whose bottom dead center is the wire crimping line. A crimping chuck body is provided, and a pressing body facing the crimping chuck body is attached to the slide body in a retractable elastic manner, and the pressing body is attached to the crimping chuck body and the pressing body. The elasticity is relatively adjusted so that as the sliding body descends, the pressing body presses and descends the crimp chuck body to the bottom dead center, and further, the sliding body has the terminal A mold release tool facing the terminal is elastically attached so as to be freely retractable, and when the slide body is lowered, the mold release tool comes into pressure contact with the crimp terminal and releases the mold by its own elasticity. It consists of a crimping and releasing mechanism for crimp terminals.

"Function" According to the mold release mechanism configured as described above, the terminal is crimped while the electric wire is held in a straight line, and the crimped terminal is released from the crimper in that state.

"Example" The structure and operation of the present invention will be explained in detail based on the following example. Part 1 to show an example of this
In FIG. 8, the terminal crimping machine of the present invention has a lower die anvil 6 fixed on a fixed underframe 10,
Above the anvil 6, an upper die crimper 5 is attached to a slide body 9 that moves up and down in conjunction with the press ram. Then, the terminals 2 forming a chain are sequentially and continuously supplied onto the anvil 6, and the ends of the wires 1 clamped by the wire conveying chuck 4 are sequentially fed above the terminals 2, and the ends of the wires 1 are sequentially fed onto the slide body 9. The crimp piece 3 of the terminal 2 is plastically deformed by the downward movement, and the terminal 2 is crimped onto the electric wire 1. Note that the crimper 5 and anvil 6 are the same as the conventional one shown in FIG.

In the terminal crimping machine described above, a crimping chuck body 11 is provided on the underframe 10 in front of the anvil 6, and the crimping chuck body 11 is elastically supported by a spring body 14 and attached to the underframe 10. The head part has chuck claws 16A and 16B as shown in the third figure, and transfers and clamps the electric wire 1 fed by the wire conveying chuck 4 during crimping. It is designed to be clamped. The crimping chuck body 11 has chuck claws 16A,
16B has a pressing part 15 formed in a stepped shape in front of the crimping chuck body 11.
is formed so that it interferes with the underframe 10 and reaches the bottom dead center, and the electric wire 1 clamped by the chuck claws 16A, 16B is fixedly held on the crimp line 1'.

Above the crimp chuck body 11, there is a pressing body 12 attached to the slide body 9 facing the crimp chuck body 11, and a spring body 18 is disposed between the pressing body 12 and the slide body 9. When it is free, it stops at the lower limit position and interlocks with the slide body 9, and can freely retreat into the slide body 9 in response to external force. Further, a pressing point 19 is provided at the lower end of the pressing body 12, and when the pressing body 12 is lowered, the pressing point 19 comes into contact with the pressing portion 15 of the crimping chuck body 11. The spring body 18 of the press body 12 is considerably larger than the spring body 14 of the crimp chuck body 11 so that the press body 12 hardly moves back and the crimp body 11 is forcibly lowered when the two contact each other. The elasticity of the attachment between the pressing body 12 and the crimping chuck body 11 is relatively adjusted.

On the other hand, a mold release tool 13 is attached to the slide body 9 along the rear of the crimper 5, and the mold release tool 13 is elastically attached to the slide body 9 by interposing a spring body 20 similarly to the pressing body 12. It is fixed at the bottom dead center position and is linked to the vertical movement of the slide body 9, and is also freely retractable into the slide body 9 in response to external force. And mold release tool 13
There is a release point 21 at the lower end, and when the terminal 2 is crimped, the upper end of the terminal 2 and the release point 21 come into pressure contact, and when the crimper 5 rises, the terminal 2 is removed by the crimper by the elasticity of the release tool 13. It is configured to be forcibly released from the mold from 5.

The press-release mechanism consisting of the press chuck body 11, pressing body 12, and release tool 13 described above operates as follows. That is, referring to FIG. 4 which shows the operation according to the processing procedure, first, when the electric wire 1 is fed by the wire conveying chuck 4, the electric wire 1 is immediately transferred to the crimping chuck as shown in FIG. 4A. The electric wire conveying chuck 4 is then clamped by the clamp claws 16 of 11 and transferred, and the electric wire conveying chuck 4 is opened. Subsequently, when the slide body 9 descends, the press body 12 descends in conjunction with the slide body 9, and the press point 19 comes into pressure contact with the press part 15 of the crimping chuck body 11, and the spring force of the spring body 14 is weak. The chuck body 11 descends while holding the electric wire in a straight line.

When the lower end 17 of the crimp chuck body 11 comes into contact with the underframe 10 and reaches the bottom dead center, the electric wire 1 reaches the crimp line 1', the crimp chuck body 11 stops as shown in FIG. 4B. Then, the slide body 9 continues to descend further, and the pressing body 12 pushes the spring body 1
8 is compressed and retreated into the slide body 9, and at the same time, the mold release point 21 of the mold release tool 13 comes into contact with the contact point 2' of the terminal 2 (the upper edge of the contact part of the terminal 2),
Due to the contact resistance, the mold release tool 13 also
Compress 0 and move back. Then, in the above state, the slide body 9 is further lowered slightly, and the crimper 5 plastically deforms the crimping piece 5 and crimps it as shown in FIG. 4C.

Then, the mold release tool 13 strongly presses the contact point 2' of the terminal 2 by the restoring force of the spring body 20 until the above crimping is completed, and after the crimping is completed, it retreats into the slide body 9 with a stroke. The mold release tool 13 strongly presses the terminal 2 by its biasing force until the lower edge of the crimper 5 rises to line A in the figure, thereby releasing the terminal 2 that has bitten into the crimper 5 from the mold. In addition, at this time, the electric wire 1 is attached to the crimping chuck body 1.
The terminal 2 crimped at the tip while being linearly clamped on the terminal 1 is released from the mold.

When the above mold release is completed and the slide body 9 rises, the pressing body 12 and the mold release tool 13 are restored by the restoring force of their own spring bodies 18 and 20, as shown in FIG. 4D. While restoring to the lower limit position, the crimping chuck body 11 releases its own spring body 14.
Due to the restoring bias, the electric wire 1 with the terminal 2 crimped thereon is held in a straight line and returned to the initial feeding position in conjunction with the upward movement of the pressing body 12. The wire 1 is then transferred to the wire conveying chuck 4 again.

As described above, the crimping and releasing mechanism of the present invention has the effect of crimping the terminal while holding the electric wire 1 in a correct straight line, and releasing the terminal in that position.

"Effects of the Invention" As described above, according to the crimping release mechanism of the terminal crimping machine of the present invention, the wire near the terminal does not bend and has the ability to form a straight-shaped terminal crimped wire of good quality. As a result, process troubles in automatic wire processing lines are significantly reduced, processing productivity is improved, and the automation of wire processing is further promoted.

[Brief explanation of the drawing]

Figure 1: A front view showing the crimping and releasing mechanism of an embodiment of the present invention, Figure 2: A vertical sectional view showing the pressing body of the embodiment of Figure 1, Figure 3: Crimp chuck of the embodiment of Figure 1. 4A-D: A front view showing the operation of the embodiment shown in FIG. 1; FIG. 5: A terminal crimping machine having a conventional structure; A is a front view; C is a front view showing the effect. Main symbols: 1...Electric wire, 2...Terminal, 3...Crimp piece, 4...Wire conveyance chuck, 5...Crimper, 6...Anvil, 7...Release member, 9...Slide body, DESCRIPTION OF SYMBOLS 10... Underframe, 11... Crimping chuck body, 12... Pressing body, 13... Mold release tool, 1
4, 18, 20... Spring body, 15... Pressing part, 1
6... Clamp claw, 19... Pressing point, 21
...Release point.

Claims (1)

[Claims] 1. A terminal crimping machine that has a fixed lower mold anvil and an upper mold crimper attached to a slide body that moves up and down, and crimps the terminal on the anvil to the electric wire by lowering the crimper. The mounted underframe is provided with a crimping chuck body for holding the electric wire, which is attached in an elastic manner so as to be able to freely descend and whose bottom dead center is the wire crimping line, and the sliding body has A pressing body facing the crimping chuck is attached in a retractable elastic manner. The slide body is relatively adjusted to lower the body to the bottom dead center, and further, a mold release tool facing the terminal is attached to the slide body in a retractable manner, and the slide body 1. A crimp-release mechanism for a crimp terminal, characterized in that the mold-release tool presses against the terminal by lowering and releases the mold by its own elasticity.