JPH0529055A - Terminal crimp automatic adjustment device - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] A terminal crimping automatic adjustment device that presses terminals and crimps them onto the strips of electric wires in a wire processing machine, and automatically crimps various wires and terminals. By adjusting and controlling, the tensile strength of terminal crimping is strengthened by the ascending / descending operation by a ball screw, and while improving quality, a large number of terminals in small quantities are produced, and mass production saves labor. [Structure] A ball screw 14 integrated with a crimper 15 is screwed up and down on a machine frame 10, and a servo motor 17 is connected to the ball screw 14 so as to rotate in the forward and reverse directions. The servo motor 17 is provided with a crimper position detection sensor 20. Attached,
A comparator 23 having a reference data input device 24 is connected to the crimper position detection sensor 20 via a length measuring converter 21, and a servo drive circuit 25 is connected between the comparator 23 and the servo motor 17. A motor current value converter 26 is connected between the servo drive circuit 25 and the comparator 23 so as to detect the load current value of the servo motor 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal crimping automatic adjusting apparatus for crimping a terminal to a strip of an electric wire in an electric wire processing machine by pressing it with a ball screw.

[0002]

2. Description of the Related Art A crimping device in an electric wire processing machine for crimping a terminal to a strip of an electric wire of this type, which has been already proposed, is constructed as shown in FIGS.

That is, in FIGS. 2 to 4, a crimp (upper mold) 2 is provided with a ram 3 on a crank mechanism (upper mold) 2 on an upper portion 1a of a substantially U-shaped machine frame 1 of a crimping device in an electric wire processing machine. A clinker height adjusting device (a lower limit lowering position adjusting device for the crimper) 4 is installed in the machine frame 1 above the ram 3 so that it can be moved up and down. In addition, the crimper height adjusting device 4 rotates the dial adjusting knob 4a attached to the side surface of the machine frame 1 with a fingertip so as to align with the index 5, so that the height of the crimper 2 is adjusted by the crimper height adjusting device 4. Is being adjusted. further,
On the support base 1b of the machine frame 1 just below the crimper 2,
An anvil (lower mold) 6 is laid, and the anvil 6 is pressed together with the crimper 2 to press the barrel Wa of the terminal Wb onto the strip Wa of the electric wire W to crimp.

Therefore, in the crimping device in the above-described electric wire processing machine, the height of the crimper 2 is adjusted by the crimper height adjusting device 4 by previously turning the dial adjusting knob 4a with the fingertip so as to match the mark 5. The terminal Wb is crimped to the strip Wa of the electric wire W by the cooperation of the crimper 2 and the anvil 6 through the crank mechanism having the ram 3 by adjusting and then driving the driving mechanism of the crimping device. It has been crimped.

In particular, regarding the relationship between the electric wire and the terminal used in the above crimping device, there is a wire of a large size to a wire of a small size, and there are terminals of different shapes and terminals of different sizes. In order to adjust the height H of the barrel of the terminal to be crimped and caulked to the stroke due to the pressing force of the crimper 2, by turning the dial adjusting knob 4a with the fingertip (manual) to the indicator 5, The height of the crimper 2 is adjusted by the crimper height adjusting device 4.

[0006]

However, the above-mentioned crimping device in the electric wire processing machine has the above dial adjustment in order to match the electric wires of different sizes and the terminals of different shapes for crimping and caulking them and the terminals of different sizes. Because the height of the crimper 2 is adjusted by turning the knob 4a with the fingertip to the index 5, it is necessary to crimp and crimp various terminals to the strips of a small amount of various types of electric wires by manual adjustment. Therefore, not only does it require skill, but it also takes a lot of time and labor, and it is difficult to achieve labor saving by mass production.In addition, while the crimping device is in operation, different-sized electric wires and different-sized terminals are crimped. Since it cannot be caulked, it is difficult to improve productivity.

On the other hand, as the material of the terminal Wb, there are brass, phosphor bronze, SUS, and those which are surface-treated with tin, nickel, silver, gold or the like, but the load applied to them varies depending on the material. Nevertheless, the terminal Wb is not pressurized and caulked with an appropriate load.

On the other hand, for example, wire terminals used in safety devices, such as airbag devices for protecting automobile drivers, which give the highest priority to safety of human life, are desired to have an absolutely reliable operation. The emphasis is on the quality of wire terminals, rather than the productivity of mass production.

On the other hand, it has been experimentally clarified that the slower the descending speed of the crimper 2 is, the higher the tensile strength of the terminal crimping is.

The present invention has been made in view of the above-mentioned circumstances, and standard data of different-sized electric wires and terminals of different shapes for crimping and caulking them and terminals of various materials of different sizes are standardized. Preliminarily input to the data input device and automatically and precisely adjust and control the crimper height according to the predetermined wire size and terminal size without requiring skill, and the tensile strength of terminal crimping is enhanced by the lifting operation by the ball screw. It is an object of the present invention to provide a terminal crimping automatic adjusting device which is capable of producing a large number of terminals in a small amount while improving quality accuracy and saving labor by mass production.

[0011]

SUMMARY OF THE INVENTION The present invention is a crimping device provided with an anvil and crimper for crimping a terminal to a strip of electric wire, and a machine screw of the crimping device is provided with a ball screw integrated with the crimper so that the ball screw is vertically movable. Then, a servomotor is connected to the ball screw so as to rotate forward and backward, a crimper position detection sensor is attached to the servomotor, and a comparator equipped with a reference data input device is attached to the crimper position detection sensor. Connect a servo drive circuit between this comparator and the servo motor, and connect a motor current value converter between the servo drive circuit and the comparator to detect the load current value of the servo motor. Are connected to each other.

[0012]

According to the present invention, various standard data for different-sized electric wires and terminals of different shapes for crimping and crimping them and terminals of different sizes are input to the standard data input device, and predetermined electric wires and terminals are input. And the crimper position detection sensor detects the height of the crimper, this detection signal is converted by the length measuring converter, and this is input to the comparator equipped with the reference data input device for arithmetic comparison and through the servo drive circuit. The forward / reverse operation of the servo motor is controlled, and the load current value of the servo motor is detected by the motor current value converter connected to the servo drive circuit, and this detection signal is compared with the reference data input device. It is fed back to the controller and compared for calculation to control the forward / reverse operation of the servo motor through the servo drive circuit, and the crimper is controlled by the specified wire size and terminal size. The height is automatically adjusted accurately without the need for skill, and the tensile strength of the terminal crimp is strengthened by the ball screw raising and lowering operation to improve the quality accuracy and produce a large number of small quantities to save labor by mass production. It is intended to

[0013]

The present invention will now be described with reference to the illustrated embodiments.

In FIG. 1, reference numeral 10 is a substantially U-shaped machine frame of a crimping device in an electric wire processing machine, and a pair of upper and lower bearings 11 is provided on an upper portion 10a of the machine frame 10. A driven wheel (transmission belt wheel) 12 is rotatably fitted in the bearings 11. Further, a ball screw 14 having a ram 13 is screwed up and down on the driven wheel 12, and a crimper (upper mold) 15 is vertically provided at a lower portion of the ram 13. Further, an anvil (lower mold) 16 is laid on the support base 10b of the machine frame 10 just below the crimper 15.
6 is a strip W of electric wire W in cooperation with the above crimper 15.
The terminal Wb is crimped to a. Furthermore,
The servomotor 1 is installed in the machine casing 10 near the driven vehicle 12.
7 is provided in a vertical direction so as to rotate in the forward and reverse directions, and a drive wheel 18 is mounted on an output shaft 17a of the servo motor 17. The drive wheel 18 is connected to the driven wheel 12 by a timing belt 19. It is connected. In addition, the driving vehicle 1
A crimper position detection sensor (crimper height detection sensor) 20 such as a potentiometer, an encoder, or a rotation detector is attached to the machine frame 10 immediately above 8 by being connected to the output shaft 17a.

That is, this crimper position detection sensor 20
Is attached so as to detect the lowest descent position of the crimper based on the rotation speed of the servomotor 17. or,
In this crimper position detection sensor 20, a length-measuring converter (a length-measuring conversion system or a ram position conversion system) 21 of a crimper's height detection signal which measures and outputs the lowermost descent position of the crimper, and an amplifier 22 is provided. Connected through. In addition, the length measurement converter 21 includes, for example, a central processing unit (C
A comparator 23 incorporated in a control circuit such as PU) is connected to the comparator 23. The reference data input device 24 inputs standard data of electric wires of various sizes and terminals of various materials. Connected.

On the other hand, a servo drive circuit (servo motor drive circuit) 25 is connected between the comparator 23 and the pulse motor 17, and the servo drive circuit 2 is provided.
5 and the comparator 23, a motor current value converter (also called a motor current load converter) 26 is an amplifier.
The motor current value converter 26 detects the load current value of the servomotor 17 and feeds it back to the comparator 23. That is, the motor current value converter 26 detects the load current value of the servo motor 17 to compare the input data of the reference data input device 24 with the servo data according to the material and size of the terminals to be crimped. The load current value of the motor 17 is automatically adjusted and controlled, and the pressing force for obtaining the barrel height H (see FIG. 4) of the terminal Wb of a predetermined size is controlled.

The operation of the present invention will be described below.

Therefore, a large number of standard data of the electric wires W of different sizes and the terminals Wb of different sizes are input to the standard data input device 24 in advance.

Next, based on a drive signal from a comparator 23 incorporated in a control circuit such as a central processing unit (CPU), the servo motor 17 is passed through a servo drive circuit 25.
To drive. Then, the output shaft 1 of this servo motor 17
Since the driving wheel 18 integrated with 7a rotates the driven wheel 12 via the timing belt 19, the ball screw 14 screwed onto the driving wheel 18 descends, and the crimper 15 causes the strip Wa of the electric wire W on the anvil 16 to reach the predetermined terminal Wb. While pressing and crimping firmly, the crimper position detection sensor 20
The lowermost lower limit position of the crimper 15 is measured and detected, and this height detection signal is sent to the length measuring converter 21 by an amplifier 22.
Via a digital signal, which is input to the comparator 23, the comparator 23 performs a comparison operation with the standard data of the reference data input device 24, and further connects to the servo drive circuit 25. The motor current value converter 26 detects the load current value of the servo motor 17 to compare the input data of the reference data input device 24 with the input data of the reference data input device 24 according to the material and size of the terminal to be crimped. The load current value of is automatically adjusted and controlled.

That is, the comparator 23 performs a comparison operation with the standard data of the reference data input device 24 and controls the pressing force to obtain the barrel height H (see FIG. 4) of the terminal Wb of a predetermined size. With this, the height of the crimper 15 (the lowermost descent position of the crimper) and the pressing force are automatically and accurately adjusted and controlled according to the size of the predetermined electric wire W and the terminal Wb. We are striving to save labor through mass production by strengthening production and improving quality accuracy.

In the embodiment of the present invention, the transmission mechanism of the servomotor 17 is explained by using the timing belt 19, but as shown by the chain line in FIG. 1, within the scope not changing the gist of the present invention. Further, for example, the spline shaft 28 is slidably fitted to the ball screw 14, and the output shaft 17a of the servomotor 17 is attached to the spline shaft 28.
It is free to change the design to connect the.

[0022]

As described above, according to the present invention, in the crimping device provided with the anvil and the crimper for crimping the terminal to the strip of the electric wire, the ball screw integrated with the crimper can be raised and lowered in the machine frame of the crimping device. The servomotor is connected to the ball screw so as to rotate in the forward and reverse directions.The servomotor is provided with a crimper position detection sensor, and the crimper position detection sensor is equipped with a reference data input device. Connect via a length converter, connect a servo drive circuit between this comparator and the servo motor, and connect a motor current value converter between the servo drive circuit and the comparator and load current of the servo motor. Since it is connected to detect the value, the height of the crimper can be adjusted automatically and accurately without the need for skill, depending on the size of the wire and the size of the terminal. While, to enhance the tensile strength of crimping in vertical movement by a ball screw, to produce a terminal-mix low-volume while improving quality and has an excellent effect such as can be achieved labor saving by mass production.

[Brief description of drawings]

FIG. 1 is a block diagram of a terminal crimping automatic adjusting device of the present invention.

FIG. 2 is a side view of an already proposed crimping device.

FIG. 3 is a side view of an electric wire and a terminal crimped by the crimping device.

FIG. 4 is an enlarged cross-sectional view taken along the chain line AA in FIG.

[Explanation of symbols]

 10 Machine Frame 14 Ball Screw 15 Crimper 16 Anvil 17 Servo Motor 20 Crimper Position Detection Sensor 21 Length Measuring Converter 23 Comparator 24 Reference Data Input Device 25 Servo Drive Circuit 26 Motor Current Value Converter

Claims (1)

Claim: What is claimed is: 1. A crimping device comprising an anvil and a crimper for crimping a terminal to a strip of an electric wire, and a ball screw integrally screwed to the crimper on a machine frame of the crimping device. , A servomotor connected to the ball screw so as to rotate forward and backward, a crimper position detection sensor attached to the servomotor, and reference data connected to the crimper position detection sensor through a length measuring converter. A comparator equipped with an input device, a servo drive circuit connected between the comparator and the servo motor, and a load current value of the servo motor between the servo drive circuit and the comparator. And a motor current value converter connected to the terminal.