JPS6229157B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small press device that uses a small pressure or switching die, for example, a die for crimping lead wires of crimp terminals, cutting wires, electric wires, etc., or staking rivets. .

Conventionally, there have been few handy and powerful power devices used as compact pressing or cutting presses, but the present invention uses an extremely small prime mover, such as a battery-driven prime mover, a pneumatic motor, a hydraulic motor, etc., as the power source. The objective is to provide a powerful, compact and lightweight press device that does the following:

The present invention uses the above-mentioned small-sized prime mover as a power source, obtains appropriate rotational force using a speed reducer, etc., connects a swinging lever to a fulcrum shaft provided on a fixed lever, and connects the swinging lever to the rear end of the swinging lever. The formed power transmission section is driven by the prime mover and is brought into sliding contact with a cam whose rotating shaft direction is perpendicular to the direction of the fulcrum axis of the swinging lever, thereby converting the rotation of the cam into a swinging motion of the swinging lever. , in which a pressurizing or cutting die axially connected between the tip portions of the swinging lever and the fixed lever is operated, in order to reduce the sliding resistance between the swinging lever and the cam. A power transmission section of a rocking lever is provided with a sliding plate between the power transmission section and the cam that moves linearly reciprocally according to the rotation of the cam and whose contact surface with the power transmission section is a flat plate, and also comes into contact with the sliding plate. The present invention is characterized in that a rotatable contact roll is provided in the cam, and that an eccentric cylindrical cam having a sliding ring rotatably fitted on the outer periphery via a bearing member is used as the cam.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the small-sized press apparatus of the present invention is embodied 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 the power gear 4, and the rotational force of the electric motor 1 is reduced by a reduction gear 2 at an appropriate reduction ratio and transmitted to the power gear 4 via the pinion 3. The power gear 4 is provided with an eccentric cylindrical cam 4' on the side opposite to the electric motor, and the cylindrical cam 4' rotates eccentrically in accordance with the rotation of the electric motor. A sliding ring 6 is rotatably fitted on the outer periphery of the eccentric cylindrical cam 4' via a needle bearing member 5. Reference numeral 7 denotes a sliding plate that reciprocates from the bottom dead center to the top dead center according to the eccentric rotation of the sliding ring 6 fitted to the eccentric cylindrical cam 4'. The horizontal plate-shaped part contacts the sliding ring 6, the central part of the hanging plate-shaped part has a vertically elongated through hole into which the rotating shaft of the power gear loosely fits, and the sliding guides provided in the motor case 8 have both sides. It is inserted between the bearing part of the power gear 4 and the end face of the eccentric cylindrical cam 4', and the contact position between the lower face of the horizontal plate part and the sliding ring 6 is adjusted according to the eccentric rotation of the cam. It is constructed so that even if it moves from side to side, it always maintains a horizontal state and reciprocates in a straight line in the vertical direction.

Further, a fixed lever 9 fixed to the front end of the motor case 8 is provided with a fulcrum shaft 11 in a direction perpendicular to the axis of the power gear 4, and a swing lever 10 is axially coupled to the fulcrum shaft 11. A contact roll 12 is axially coupled to a power transmission portion formed at the rear end of the swing lever, and this contact roll 12 is in contact with the upper surface of the sliding plate 7 described above. Therefore, when the sliding plate 7 rises due to the eccentric rotation of the cam 4', the swing lever 1
Accordingly, the power transmission section 0 is pushed up via the contact roll 12 about the fulcrum shaft 11. At this time, the contact roll rotates and moves rearward by the amount of parallel displacement of the contact roll attachment part of the power transmission part due to the rotation of the swing lever about the fulcrum shaft 11.

A crimping die 13 for a crimp terminal is axially connected to the tip of the fixed lever 9 and the swinging lever 10 by a shaft 14, and the seesaw movement of the swinging lever causes the crimping engagement part of the die 13 to connect to the die fixing shaft 15. Operates to engage under pressure at the center.

The device of the present invention has the above-described configuration, and the electric motor 1
When a power source is connected to the
The signal is transmitted through the speed reducer 2 and rotates the eccentric cylindrical cam 4'. Since a sliding ring 6 is fitted to the eccentric cylindrical cam 4' via a relatively thin needle bearing member 5, the sliding ring 6 also moves eccentrically, and a sliding plate 7 is installed in the motor case 8. The eccentric cylindrical cam 4' is caused to move linearly and reciprocally along the sliding plate guide with a stroke from the bottom dead center to the top dead center. The load exerted by the swing lever 10 on the sliding plate 7 becomes a load on the eccentric cylindrical cam, and the sliding ring 6 is fitted to the eccentric cylindrical cam via the needle bearing member 5 as described above. Therefore, the friction loss caused by the eccentric cylindrical cam 4' and the sliding ring 6 due to load application is significantly reduced by the rotation of the needle bearing member 5.
In addition, the sliding plate 7 is limited to linear reciprocating motion by a sliding plate guide formed in the prime mover case 8 and reciprocates between the bottom dead center and the top dead center of the eccentric cylindrical cam 4'. The mechanical loss caused by the rotation of the sliding ring 6 is only due to the lateral pressure of the sliding plate 7 against the sliding plate guide, and the power generated by the eccentric cylindrical cam 4' can be transmitted to the upper surface of the sliding plate 7, and the swinging Lever contact roll 1
2 acts as a uniform load, and can prevent eccentric loads from being applied to the swing lever.

Furthermore, the power transmission part of the swing lever 10 is in contact with the upper surface of the sliding plate 7, and the sliding plate 7 is connected to the eccentric cylindrical cam 4'.
When driven toward the top dead center by the eccentric movement of the swing lever 10, the swing lever 10 rotates around the support shaft 11 in a seesaw motion. At this time, the contact portion of the power transmission section of the rocking lever with the sliding plate 7 moves the upper surface of the sliding plate by the amount of parallel displacement due to the rotation angle of the rocking lever, causing frictional movement at the contact portion. However, a contact roll 12 is axially connected to the power transmission portion of the swing lever, and the contact roll 12 is in contact with the sliding plate via the contact roll, so that the eccentric cylindrical cam 4' moves the contact roll 12 toward the top dead center. When the contact roll is pushed up, the contact roll rotates by the amount of parallel displacement caused by the rotation angle of the swing lever, so that mechanical loss is significantly reduced.

The swing lever 10 is restrained by the eccentric cylindrical cam 4', the support shaft 11, and the fixed shaft of the die only when the eccentric cylindrical cam 4' moves from the bottom dead center to the top dead center. When the core cylindrical cam 4' is in the bottom dead center region, the power transmission part of the swing lever 10 is at a free end that is not constrained by the eccentric cylindrical cam 4', so the swing lever can be lightly seesawed from the outside. The dice can be opened and closed easily.

In the above-mentioned embodiment, the present invention was embodied as a crimping machine for crimp terminals, but a cutting die may be attached in place of the crimping die 13 of the above-mentioned embodiment, and the present invention may be used as a tool for cutting wires, electric wires, etc. It can be widely applied to tools that use pressing force, such as rivet riveting tools by attaching a riveting die.

Furthermore, in the above embodiment, an eccentric cylindrical cam fitted with a sliding ring via a bearing member was used in order to minimize frictional resistance.
It is also possible to use any shape such as oval or oval.

As mentioned above, the device of the present invention has a relatively small number of parts, and the mechanical loss is reduced as much as possible at the point where the power is transmitted, so the overall power transmission loss is reduced, and the device is compact and lightweight. Alternatively, it is extremely effective as a small press device equipped with a cutting die.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of a small press apparatus of the present invention, and FIG. 2 is a cross-sectional view taken along the line A--A in FIG. 4...Power gear, 4'...Eccentric cylindrical cam, 5...
... Bearing member, 6 ... Sliding ring, 7 ... Sliding plate, 8 ... Prime mover case, 9 ... Fixed lever,
10... Swing lever, 11... Fulcrum shaft, 12...
Contact roll, 13...crimping die.

Claims (1)

[Scope of Claims] 1. A swinging lever is axially coupled to a fulcrum shaft of a fixed lever, and a power transmission section of the swinging lever is driven by a prime mover so that the direction of the rotating shaft is orthogonal to the direction of the fulcrum shaft of the swinging lever. In the apparatus, the rotary motion of the cam is converted into a swinging motion by sliding contact with a cam, and a pressurizing or cutting die is axially coupled to the tip of the swinging lever and the corresponding fixed lever. A swinging lever is provided between a power transmission part of the lever and a cam that moves linearly back and forth according to the rotation of the cam, and whose contact surface with the power transmission part is a flat plate, and which comes into contact with the sliding plate. A small press device characterized in that a rotatable contact roll is provided in the power transmission section. 2. The small press device according to claim 1, wherein the cam is an eccentric cylindrical cam having a sliding ring rotatably fitted on the outer periphery via a bearing member.