JPH05159847A - Automatic controller of pressure in press unit - Google Patents

Abstract

PURPOSE:To promote an improvement in quality in a way of regulating a pressurized state of caulking a terminal to a cable with an anvil and a lifting crimper in an automatic manner, in an automatic controller of pressure in a press unit for the cable terminal such as a crimping machine for caulking the terminal to a strip part of the cable. CONSTITUTION:In a press unit, installing an anvil 2 in the lower part of a machine frame 1, and making a lifting crimper 14 go and down to this machine frame 1 situated just above this anvil 2 through a crank mechanism, a suppressing part 3 of this crank mechanism is installed in the machine frame 1 being situated just above the anvil 2. A pressure detecting sensor 20 is fitted in the machine frame 1 beside this supporting part 3 so as to be floated by a spring 21, then an adjusting screw shaft 22 is installed on top of this pressure detecting sensor 20. In succession, a pulley 23 is fitted in this adjusting screw shaft 22, thereby making this shaft 22 so as to go up and down, and a servomotor 24 is connected to the pulley 23 via a belt 25, while a zero position detecting sensor 27 is installed in the machine frame 1 just above the adjusting screw shaft 22, thereby making this shaft 22 come into contact with this sensor, thus a zero position is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic pressure control device for a wire terminal pressing device such as a crimping machine in a wire processing machine for crimping and mounting a terminal on a strip portion of a wire.

[0002]

2. Description of the Related Art A pressure control device for a pressing device in an electric wire processing machine of this type that has already been proposed is constructed as shown in FIGS.

In FIGS. 5 and 6, an anvil 2 is installed on a machine base 1a of a machine frame 1 of the press machine, and a support portion is provided inside the machine frame 1 located right above the anvil 2. 3 is provided, and in this bearing 3,
A swing lever 4 is pivotally mounted on a support shaft 5 so as to be swingable.
Further, the eccentric rocking member 6 is attached to the free end of the rocking lever 4.
Are connected by a pin shaft 7, and a base portion 6a of the eccentric rocking member 6 is loosely fitted to an eccentric pin 9 of a drive shaft 8 mounted on the machine frame 1 via a ball bearing (not shown). It is equipped. Further, an arm rod 10 is pivotally attached to each end of the eccentric swing member 6 and the swing lever 4 by the pin shaft 7, and a ram member 11 is attached to the end of the arm rod 10. A support shaft 12 is slidably connected in the vertical direction. Further, a ram bolt 13 is screwed to the ram member 11 so that the stroke can be adjusted, and an elevating crimper 14 cooperates with the anvil 2 on the engaging portion 13a of the ram bolt 13 to connect the terminal A of the ram bolt 13. The barrels A1 and A2 are detachably connected so as to be caulked to the electric wire a (see FIG. 6). Further, the pressure detection sensor 1 such as a load cell is provided on the machine casing 1 directly above the support portion 3.
5 is attached by fixing with a bolt 16 so as to detect the pressure at the time of crimping the terminal, and the pressure detection signal of this pressure detection sensor 15 is adapted to display the detected pressure on the display section of a control circuit (not shown). There is.

Therefore, as shown in FIG. 6, the pressure control device of the pressing device in the above-mentioned electric wire processing machine, when the terminal A is crimped by caulking the barrels A1 and A2 to the strip a1 of the electric wire a, By rotating the eccentric pin 9 of the drive shaft 8, the eccentric rocking member 6 is moved by the drive shaft 8.
Since it swings around, the swing lever 4 connected to the eccentric swing member 6 swings around the support shaft 5 of the support portion 3 as a fulcrum, and the ram member 11 through the arm rod 10. The ram bolt 13 and the elevating crimper 14 ascend and descend to cooperate with the anvil 2 to crimp the barrels A1 and A2 of the terminal A onto the electric wire a.

On the other hand, the pressure detection sensor 15 detects the pressure at the time of crimping the terminals and displays the detected pressure on the display section of a control circuit (not shown).

[0006]

However, the pressure detection sensor 15 of the pressure control device of the press device in the above-mentioned electric wire processing machine detects the pressure at the time of crimping the terminal and displays this on the display part of the control circuit. However, in reality, the pressure must be set by the trial press work when inputting the pressure setting, so not only time and effort are spent, but also skill is required, and the pressure is set by the trial press work. Therefore, many terminals A are wasted.

Further, the above-mentioned press device in the electric wire processing machine has a large number of applicators which differ from one manufacturer to another. Since the bottom dead center position of the stroke of each applicator is different, it is necessary to adjust the appropriate stroke. Not only is it difficult to perform, but the work efficiency is poor because a new adjustment work is performed after the lifting crimper 14 is removed, and it is difficult to save labor due to a large number of small quantities.

On the other hand, the wire terminal has a hard type or a soft type, and even though the terminal itself has a thick wall or a thin wall, the wire a has a strip portion a1. Since the ram bolt 13 is used to press the barrels A1 and A2 of the terminal A, which are caulked and attached, the pressure of these terminals depends on the individual difference.
It is expected that the coating will be crimped to such an extent that it will damage the coating, and it is difficult to crimp terminals of uniform quality.

Further, in the above-mentioned pressure control device for the press device, the drive mechanism section may change due to thermal expansion or wear during long-term operation, and in reality, the terminal may be operated in the same state as when the pressure setting is input. There is a problem that it is difficult to maintain the crimping force.

The present invention has been made in view of the above-mentioned circumstances, and a pressure detection sensor is provided on a part of the drive link mechanism so as to be automatically adjusted and controlled, and an origin position detection sensor is attached to the pressure detection sensor. To provide an automatic pressure control device for a press device in which the position of a detection sensor is regulated and a terminal is crimped to an electric wire with an anvil and a lifting crimper to automatically adjust a pressurizing state to improve quality. With the goal.

[0011]

DISCLOSURE OF THE INVENTION The present invention is a press device in which an anvil is provided in the lower part of a machine frame, and a lifting mechanism is raised and lowered by a crank mechanism on the machine frame located directly above the anvil. A support portion of the crank mechanism is provided on the machine frame, and a pressure detection sensor is fitted to the machine frame near the support portion so as to float by a spring, and an adjusting screw shaft is provided on the pressure detection sensor. A pulley is screwed on this adjusting screw shaft so that this adjusting screw shaft moves up and down together with the pressure detection sensor.A servo motor is connected to this pulley via a belt, and the origin position is set on the machine frame directly above the adjusting screw shaft. A detection sensor is attached and the adjustment screw shaft is contacted to detect the origin position.

[0012]

According to the present invention, the bottom dead center position (crimp height) of the stroke of each of the different types of applicators and the pressure of the set crimp of each terminal are input to the control circuit in advance.
The servomotor is driven based on the control signal from the control circuit, the adjusting screw shaft is raised through the belt of the servomotor, and the adjusting screw shaft is brought into contact with the origin position detection sensor to detect the origin position. After that, the servo motor is driven to lower the pressure detection sensor of the adjusting screw shaft against the spring, and the bottom dead center position of the stroke of each elevating crimper of each applicator is detected by the pressure detection sensor and automatically detected. After that, the terminal is crimped to the wire with the anvil and the lifting crimper, and the pressurized state is always automatically adjusted to improve the quality.

[0013]

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

In the present invention, the same components as those of the above-described embodiment will be described with the same reference numerals.

1 to 5, reference numeral 1 is a machine frame of a pressing device in an electric wire processing machine, and an anvil (see FIG. 6) 2 is installed on a machine base 1a of the machine frame 1. Inside the machine frame 1 located directly above the anvil 2, a supporting portion 3 is provided in a stationary state with its position regulated. The supporting portion 3 has a swing lever 4 on a supporting shaft 5. It is swingably pivoted. An eccentric oscillating member 6 is connected to a free end of the oscillating lever 4 by a pin shaft 7, and a base 6a of the eccentric oscillating member 6 is a drive shaft mounted on the machine frame 1. It is loosely fitted to the eccentric pin 9 of the shaft 8 via a ball bearing (not shown). Further, the arm rod 10 is provided at each end of the eccentric rocking member 6 and the rocking lever 4.
Is pivotally attached by the pin shaft 7, and a ram member 11 is connected to an end portion of the arm rod 10 by a support shaft 12 so as to be slidable in the vertical direction. Furthermore, a ram bolt 13 is screwed to the ram member 11 so that the stroke can be adjusted, and an elevating and lowering crimper 14 of the applicator cooperates with the anvil 2 at an engaging portion 13a of the ram bolt 13. The barrels A1 and A2 of the terminal A are detachably connected so as to be caulked to the electric wire a (see FIG. 6). Further, in the machine casing 1 directly above the support portion 3, for example,
A pressure detecting sensor 20 such as a shear type load cell is fitted so as to float by the elasticity of a coil spring 21, and an adjusting screw shaft 22 is integrated with the pressure detecting sensor 20 above the pressure detecting sensor 20. Is provided. Furthermore, the pulley 23 is supported by the pair of upper and lower bearings 22b so as not to move vertically in the machine frame 1 where the adjusting screw shaft 22 is located. 22 is screwed so as to move up and down. or,
An output shaft 24a of a servo motor 24 such as an AC servo motor is connected to the pulley 23 via a belt 25 such as a timing belt, and the servo motor 24 is connected to the machine frame 1. It is installed upside down. Further, as shown in FIG. 4, the control circuit 24a of the servo motor 24 is provided with a main control circuit 26a of the main control device 26 provided in the machine casing 1 via a pressure control circuit 20a and a control circuit 27a described later. Connected. Further, an origin position detection sensor 27 such as a switch is attached to the machine frame 1 immediately above the adjustment screw shaft 22 so as to detect the origin position by abutting the upper surface 22a of the adjustment screw shaft 22. The origin position detection sensor 27 is connected to the control circuit 27a. Furthermore, the detection signals of the pressure detection sensor 20 and the origin position detection sensor 27 indicate the detected pressure on the display unit of the main controller 26.

The operation of the present invention will be described below. Therefore, as shown in FIG.
When the bottom dead center position of the stroke 4 is adjusted, the bottom dead center position (crimp height) of the stroke of each of the different types of applicators is input to the main controller circuit 26a of the main controller 26 in advance. ..

Next, the servo motor 24 is driven based on the control signal from the main control circuit 26a, and the adjusting screw shaft 22 is moved up via the belt 25 of the servo motor 24 to move the adjusting screw shaft 22. The upper surface 22a is brought into contact with the origin position detection sensor 27 to detect the origin position. Then, the servo motor 24 is further driven to drive the adjusting screw shaft 22.
The pressure detection sensor 20 is lowered against the elasticity of the coil spring 21, the bottom dead center position (crimp height) of the stroke of each of the elevating and lowering crimpers 14 is detected by the pressure detection sensor 20, and the signal of the detected pressure is The servo motor 24 is transmitted to the main control circuit 26a, compared and calculated here, and the servo motor 24 is driven based on the control signal from the main control circuit 26a, and the adjusting screw shaft 22 is passed through the belt 25 of the servo motor 24.
The anvil 2 is automatically adjusted by controlling the elevator
The terminal A is crimped to the electric wire a by the lifting and lowering crimper 14 and the barrels A1 and A2 of the terminal A are attached to the strip portion a1 of the electric wire.
We constantly improve the quality by automatically adjusting the pressurizing condition that is caulked.

The flow chart shown in FIG. 5 shows the operation process of the present invention.
The learning diagnosis function input to 6a learns and diagnoses the pressurization state by learning and diagnosing the fluctuation of the crimp height due to the heat generation of the drive motor due to long-time driving, the thermal expansion deformation such as the load resistance friction heat, and the waveform deformation generated in the pressure detection sensor 20. Adjustments are made to improve quality.

Although the present invention has been described with reference to a specific example applied to a pressure automatic control device of a wire terminal pressing device such as a crimping machine, it does not change the gist of the present invention. The design can be freely changed to be used for a hydraulic press, an air press, a post guide press or the like of the terminal.

[0020]

As described above, according to the present invention, an anvil is provided in the lower part of the machine frame, and a press device for elevating and lowering an elevating crimper by a crank mechanism is provided in the machine frame located directly above the anvil. A bearing for the crank mechanism is provided on the machine frame located directly above, and a pressure detection sensor is fitted to the machine frame beside the support so as to float by a spring, and an adjusting screw shaft is mounted above the pressure detection sensor. A pulley is screwed onto this adjusting screw shaft so that the adjusting screw shaft can be moved up and down.A servo motor is connected to this pulley via a belt, and the origin position is detected on the machine frame directly above the adjusting screw shaft. Since a sensor is attached and the origin position is detected by abutting the adjusting screw shaft, the anvil and the elevating crimper can automatically adjust the pressurizing state of crimping the terminal to the wire to improve the quality. Just It is possible to improve the quality by exerting a learning diagnosis function for the heat generation of the motor due to long-time driving, the fluctuation of the crimp height due to the thermal expansion deformation such as load resistance frictional heat, and the waveform deformation generated in the pressure detection sensor. Has the excellent effect of.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of an automatic pressure control device for a press device according to the present invention.

FIG. 2 is a cross-sectional view taken along the chain line AA of FIG.

FIG. 3 Same as above

FIG. 4 is a block diagram of an automatic pressure control device for a press device according to the present invention.

FIG. 5 is a flowchart for explaining the operation of the present invention.

FIG. 6 is a cross-sectional view showing a part of a pressure control device of a conventional press device in a broken manner.

FIG. 7 is an enlarged cross-sectional view showing a main part of a pressure control device of a conventional pressing device.

[Explanation of symbols]

 1 Machine Frame 2 Anvil 3 Support 4 Swing Lever 6 Eccentric Swing Member 10 Arm Rod 14 Lift Crimper 20 Pressure Detection Sensor 21 Coil Spring 22 Adjustment Screw Shaft 23 Pulley 24 Servo Motor 25 Belt 26 Control Circuit 27 Home Position Detection Sensor

Claims (1)

[Claims] 1. A press device in which an anvil is provided in a lower portion of a machine frame, and a crank mechanism moves up and down on the machine frame located directly above the anvil, and the machine frame is located directly above the anvil. The bearing portion of the crank mechanism, the pressure detection sensor fitted to the machine frame beside the bearing portion so as to float by a spring, the adjusting screw shaft provided on the upper portion of the pressure detecting sensor, and the adjusting screw. A pulley that is screwed onto the shaft and that moves up and down the adjustment screw shaft, a servo motor connected to the pulley via a belt, and a machine frame directly above the adjustment screw shaft. An automatic pressure control device for a press device, comprising: an origin position detection sensor that abuts and detects the origin position.