JPS641238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compact press device for driving small-sized press dies, for example, dies for crimping lead wires of crimp terminals, cutting wires, electric wires, etc., and crimping rivets.

Conventionally, there have been few handy and powerful power devices used as compact pressure or cutting press devices, but the present invention uses an extremely small prime mover, such as an electric motor, pneumatic motor, or hydraulic motor, as the power source, and can be used for a long period of time. To provide a powerful, compact and lightweight press device that does not cause a decrease in pressurizing force even when the press equipment is used.

The gist of the present invention is to use the above-mentioned small-sized motor as a power source, obtain appropriate rotational force using a reducer, etc., and connect a swinging lever to a fulcrum shaft provided on a fixed lever.
A power transmission section formed at the rear end of the swinging lever is driven by the prime mover and is brought into sliding contact with a cam that performs an eccentric rotational motion, converting the rotation of the cam into a swinging motion of the swinging lever. In a pressurizing or cutting die that is axially connected between the tips of a movable lever and a fixed lever, the pressurizing or cutting die can be opened and closed.
Before the power transmission part of the swinging lever in contact with the cam reaches the top dead center of the cam, the engaging part of the die is tightly closed, and the excessive movement of the cam thereafter until the cam reaches the top dead center causes the die, fixed lever, This is characterized in that the eccentric momentum of the cam is set so that some or all of the members of the swing lever are deflected.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a compact press apparatus of the present invention as a crimping machine for crimp terminals will be described below with reference to the drawings.

In the figure, 1 is an electric motor, the output shaft of which is connected to a reduction gear 2, which rotates a pinion 3. The pinion 3 is meshed and connected to a power gear 4, and the rotational force of the electric motor 1 is reduced by a reduction gear 2 at an appropriate reduction ratio. 4.

An eccentric cylindrical cam 5 is provided on the side surface of the power gear 4 opposite to the electric motor, and the cylindrical cam 5 rotates eccentrically in accordance with the rotation of the electric motor. In this example, an eccentric cylindrical cam was used, but an elliptical,
Cams of any shape can be used, such as oval.

On the other hand, a fixed lever 7 fixed to the front end of the motor case 6 is provided with a fulcrum shaft 9 in a direction perpendicular to the rotation axis of the power gear 4, and a swing lever 8 is axially coupled to the fulcrum shaft 9. There is. The swing lever 8
The power transmission section 8' formed at the rear end is in sliding contact with the eccentric cylindrical cam 5 mentioned above, and as the eccentric cylindrical cam rotates, the swing lever 8 is moved to the fulcrum shaft 1.
It makes a rocking motion with 1 as the center. A crimping die 10 is attached to a shaft 11 at the tip of the fixed lever 7 and the swinging lever 8.
It is axially connected by. This die 10 has upper and lower die bodies 1 each having one end axially coupled to the fixed lever 7 and the swinging lever 8 by the shaft 11.
It is composed of a connecting plate 12 and a die shaft 13 that connect the die bodies 0a and 10b, and the die bodies 10a and 10b are connected by the swinging movement of the swinging lever.
It operates so as to close the meshing portion 14 of 10b with the die shaft 11 as a fulcrum.

The engaging portion 14 of the die body is provided with a pressing projection 15 on one side and a recess 16 into which the projection fits, as a pressing portion for a crimp terminal (not shown) as a member to be pressed. The projection 15 and the recess 1
6 are designed to face each other with a gap corresponding to the thickness of the terminal after pressurization and crimping when the meshing portion 14 is brought into close contact with each other. (In the embodiment, two sets of protrusions and recesses are provided so that two types of crimp terminals of different sizes can be processed.) In the present invention, the power transmission section of the swinging lever that is in sliding contact with the cam 5 is provided. 8' reaches the top dead center of the cam, the engaging part 14 of the die is tightly closed, and after the terminal crimping operation is completed by the protrusion 15 and recess 16 of the pressurizing part, the power transmission of the swing lever is continued. The top dead center of the cam is set so that the contact point (contact point with the cam) rises by 0.3 to 2.5 mm. A part or all of the movable lever 8, fixed lever 7, and die 10 are designed to cause deflection deformation as shown by dotted lines in FIG. This deflection deformation is canceled and multiplied when the maximum eccentric point of the cam passes through the top dead center and further rotates toward the bottom dead center.

The apparatus of the present invention has the above-described configuration, and a workpiece is inserted into the pressurizing part of the die 10,
When the prime mover 1 is rotated, the pinion 3 rotates the power gear via the reducer 2, causing the cam 5 to rotate eccentrically. Due to the eccentric rotation of the cam 5, the swinging lever 8 that is in contact with the cam swings about the fulcrum shaft, and the die 10 that is pivotally connected to the tips of the swinging lever 8 and the fixed lever 7 is rotated. Apply pressure. FIG. 2 shows the relationship between the momentum and the pressing force at the contact portion between the cam and the power transmission portion of the rocking lever, which occurs when a workpiece is inserted into the pressurizing portion of the die and the die is pressurized. In Figure 2, the origin is 0.
The displacement from a to a indicates that the workpiece inserted into the pressurizing part of the die is being pressurized, and a
At this point, the pressurization is completed and the meshing portion 14 of the die is tightly closed. After this, the displacement from point a to point b indicates a state in which the engaging part at the tip of the die is brought into close contact with each other after the processing of the workpiece is completed, and the swinging lever has moved excessively.
The pressurizing force during this period is applied to the meshing portion of the die, and the momentum is absorbed as deflection deformation of each member of the swing lever, fixed lever, and die. At point b, the maximum eccentricity of the cam reaches the top dead center, and when the cam rotates toward the bottom dead center, the power transmission section of the swinging lever begins to descend, and at point C, the deflection deformation of each member such as the swinging lever is restored. After that, the pressing force of the die becomes zero.

In general, mechanical devices undergo permanent deformation due to long-term load motion, and the press equipment that is the object of the present invention also has cams, swing levers, fixed levers,
The shafts, dies, and other members of each part gradually wear out and deform during long periods of use. On the other hand, it is desirable that the pressurizing force of the die is configured so that it does not change even if each member is worn out or permanently deformed. In the device of the present invention, the relative position of the cam and the swinging lever is set so that the swinging lever is moved excessively even after the meshing portions of the dies are brought into close contact, and this excess momentum is absorbed by deflection deformation of members such as the lever. Since the pressurizing force of the die can be maintained constant for a long period of time. Furthermore, in the device of the present invention, the pressurizing time of the die is prolonged from the start of deflection deformation of each member to the point of return due to excessive movement of the swing lever, so that the workpiece remains pressurized for a certain period of time after the pressurization is completed. When used in a crimping machine for crimp terminals shown in the embodiment, it is possible to prevent spring back immediately after plastic deformation of the workpiece and to stably obtain a predetermined pressed shape. You can kill two birds with one stone.

In the above-described embodiment, the present invention was embodied as a crimping machine for crimping and connecting lead wires to crimp terminals, but when used as a cutting machine for wires, electric wires, etc., it is possible to cut at the engagement part. It is sufficient to use a die in which a blade is formed and the meshing part is the pressurizing part of the workpiece (wire, etc.), and the device of the present invention can be widely applied to tools that utilize pressurizing force.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the device of the present invention;
FIG. 2 is a diagram showing the relationship between the momentum of the cam and the pressing force in the device of the present invention. 5...cam, 7...fixed lever, 8...swing lever, 9...fulcrum shaft, 10...dice.

Claims (1)

[Claims] 1 A swinging lever is axially coupled to a fulcrum shaft of a fixed lever, and the power transmission part of the swinging lever is brought into sliding contact with a cam driven by a prime mover to convert the rotational motion of the cam into a swinging motion, and the swinging In a device in which a pressurizing or cutting die is axially coupled to the tip of a lever and a corresponding fixed lever, the power transmission part of the swinging lever that is in contact with the cam is connected to the tip of the die before the power transmission part of the swinging lever that is in contact with the cam reaches the top dead center of the cam. The eccentric momentum of the cam was set so that the meshing part was tightly closed and after that, the die, fixed lever, and swinging lever were partially or completely deformed due to excessive movement until the cam reached the top dead center. A small press device characterized by: