JPS641239B2 - - Google Patents

Description

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

Conventionally, there have been few handy and powerful power devices used as compact pressure or cutting press devices, but the present invention provides a powerful and compact power device powered by a small prime mover, such as an electric motor, pneumatic motor, hydraulic motor, etc. This provides a lightweight press device.

The gist of the present invention is to use the above-mentioned small motor as a power source, use a reducer etc. to obtain appropriate rotational force, and rotate the cam eccentrically, while a swinging lever is coupled to a fulcrum shaft provided on a fixed lever. A power transmission section formed at the rear end of the swinging lever is brought into sliding contact with the cam to convert the rotation of the cam into a swinging motion of the swinging lever, and the rotation between the fixed lever and the tip of the swinging lever is In the pressurizing or cutting die which is axially coupled to a pressurizing or cutting die which is operated to open and close, the fixing lever is axially coupled to a positioning shaft formed on the front surface of the motor case in parallel with the fulcrum shaft at a portion below the fulcrum shaft; , characterized in that a portion above the fulcrum shaft is screwed to the prime mover case in a direction perpendicular to the fulcrum shaft.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the small press apparatus of the present invention is implemented 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 integrally provided on the side surface of the power gear 4 opposite to the electric motor side, and the cylindrical cam rotates eccentrically in accordance with the rotation of the electric motor. Although an eccentric cylindrical cam is used in this embodiment, a cam of any shape such as an ellipse or an egg can be used.

On the other hand, a fixed lever 7 attached to the front surface of the motor case 6 is provided with a fulcrum shaft 9 in a direction perpendicular to the rotation axis of the cam, that is, the rotation axis of the power gear, and a swing lever 8 is axially coupled to the fulcrum shaft 9. ing.

A pair of left and right shaft holding protrusions 6' are provided at the lower front of the motor case 6, and a positioning shaft 10 that extends between the protrusions and is parallel to the fulcrum shaft of the forward fixed lever allows the fixed lever to be fixed. The lower end of is axially connected and held. Further, the upper part of the fixed lever 6 is fixed to the motor case 6 with bolts 11 at two places on the left and right above the fulcrum shaft 9 in a direction perpendicular to the fulcrum shaft.

Further, the power transmission section 8' formed at the rear end of the swing lever 8 reaches the inside of the prime mover case 6, and is in sliding contact with the eccentric cylindrical cam 5 described above, so that the eccentric cylindrical cam rotates. As a result, the swing lever swings around the fulcrum shaft 9. A crimping die 12 is connected to the tip of the fixed lever 7 and the swinging lever 8 by a shaft 13, and one end of each of the dies 12 is axially connected to the fixed lever 7 and the swinging lever 8 by the shaft 13. It is composed of a connecting plate 14 and a die shaft 15 that connect the upper and lower die bodies 12a, 12b and the two die bodies, and the die body 1 is rotated by the swinging movement of the swinging lever.
It operates to close the meshing portions of 2a and 12b with the die shaft 15 as a fulcrum. Engagement part 1 of die body
6 is provided with a pressurizing protrusion on one side as a pressurizing part for a crimp terminal (not shown), which is a workpiece, and a recess into which the protrusion fits on the other side.

The apparatus of the present invention has the above-described configuration, and a workpiece is inserted into the pressurizing part of the die 12,
When the prime mover 1 is rotated, the pinion 3 rotates the power gear 4 via the reducer 2, causing the cam 5 to rotate eccentrically. Due to the eccentric rotation of this cam, the swinging lever 8 in contact with the cam swings around the fulcrum shaft 9, and the die 12 that is axially connected between the tips of the swinging lever 8 and the fixed lever 7 Operate under pressure.

The swing lever 8 is restrained by the cam 5, the fulcrum shaft 9, and the mounting shaft of the die 12 only when the cam 5 moves from the bottom dead center to the top dead center, and when the cam is in the bottom dead center region. Since the power transmission part 8' of the rocking lever is a free end that is not restricted by the cam, the die can be easily opened and closed by lightly moving the rocking lever from the outside after pressurization is completed. I can do it. The fixed lever 7 has a positioning shaft 10 provided below the fulcrum shaft 9 and parallel to the fulcrum shaft.
It is axially connected to the motor case 6 through the fulcrum shaft 9, and is also screwed and fixed to the motor case 6 by a bolt 11 in a direction perpendicular to the fulcrum shaft above the fulcrum shaft 9, so that the fixing lever cannot be used when assembling the device. The positioning of 7 is regulated by a positioning shaft 10 provided at the lower front of the motor case 6, and the positional relationship of each mechanical component such as the cam 5, fixed lever 7, swing lever 8, etc. with respect to the motor case is maintained accurately and constant. This enables high-precision assembly with little variation. In addition, the reaction force applied to the fixed lever 7 from the swinging lever via the fulcrum shaft 9 and the die mounting shaft 13 when pressurizing the die is generated by the positioning shaft 10.
The lever acts as if to rotate the fixing lever counterclockwise using it as a fulcrum, and acts only as a tensile load on the fixing bolt at the top, making it simple to apply loads to the prime mover case, making it easy to design the strength of the case. There are many advantages such as:

In the embodiments described above, the present invention was embodied as a crimping machine for crimping and connecting lead wires to crimp terminals, but a cutting die was attached in place of the crimping die 12 in the embodiments,
It can be widely applied to tools that utilize pressing force, such as cutting tools for wires, electric wires, etc., and rivet crimping machines by attaching crimping dies.

[Brief explanation of the drawing]

The figure is a cross-sectional view showing an embodiment of the small-sized press apparatus of the present invention. 4... Power gear, 5... Cam, 6... Prime mover cover, 7... Fixed lever, 8... Rocking lever, 9
...Fully shaft, 10...Positioning axis, 11...Bolt, 12...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 fixed lever is positioned below the fulcrum shaft and parallel to the fulcrum shaft on the front surface of the motor case. A small press device, characterized in that it is axially coupled to a shaft and screwed to a prime mover case in a direction perpendicular to the fulcrum shaft above the fulcrum shaft.