JPS5932154B2 - Cutter reciprocating drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reciprocating drive device for a cutter.
The aim is to provide a reciprocating drive for a cutter with low noise.

In the conventional cutter reciprocating drive device, as shown in Fig. 9, one end of the drive frame arm rotatably supported by a support pin is loosely fitted to an eccentric shaft fixed to the rotary shaft of the motor. There is a clearance between the eccentric shaft and the long groove bearing part C, and the engagement part between the drive pin and the drive frame arm RO to ensure smooth operation. The problem is that the noise increases due to the clearance, and the clearance increases due to collision between the eccentric shaft and the bearing part C that occurs when changing the direction of motion, and the noise increases as the usage time increases. there were.

The present invention has been made in view of the above problems, and will be described below with reference to the drawings showing embodiments of the present invention.

1 to 3, a main body case 1 is made of a synthetic resin material, and a motor X is housed in the main body case 1.

A fixed blade 2 is fixed to the main body case 1.

Comb teeth 3 are arranged side by side at one end of the fixed blade 2, and a pair of movable blade guide holes 4 with long grooves are formed in the center in the direction in which the comb teeth 3 are arranged side by side.

Comb teeth 6 are arranged side by side at one end of the movable blade 5 that comes into sliding contact with the fixed blade 2, and a pair of round driver pin mounting holes 1 are formed in the center.

The movable blade 5 is moved by the fixed blade 2 by the motor X in the direction in which the comb teeth 6 are arranged.
It moves back and forth while in sliding contact with the

The driver 8 is a driving member 1 from which a pair of driver pins 9 are protruded.
0 and a pair of connecting members 11 provided at both ends of the driving member 10 so that the driving member 10 forms a U-shape;
The connecting members 11 are connected to each other and are formed into a rectangular shape with an opening 14 in the center and a bearing member 13 having a circular hole bearing part 12 formed in the center.

The driver pin 9 protrudes in a direction perpendicular to the reciprocating direction of the movable blade 5 and the axial direction of the eccentric shaft 18.

The connecting member 11 and the bearing member 13 are formed thinner in the same direction as the direction in which the driver pin 9 protrudes, and have elasticity.

The bearing portion 12 is bored parallel to the connecting member 11.

The driver pin mounting hole γ of the movable blade 5 is fitted into the driver pin 9, and the movable blade guide hole 4 of the fixed blade 2 is guided in a reciprocating manner, and the driver pin 9 protrudes from the fixed blade 2. A pressing spring 15 for pressing the movable blade 5 against the fixed blade 2 and a seat plate 16 for preventing the pressing spring 15 from being pulled out are attached to the fixed blade 2.

An eccentric shaft 18 fixed to a rotating shaft 17 of the motor X is loosely fitted into the bearing portion 12 .

Making the bearing part 12 a round hole facilitates machining to the set dimensions, and makes it possible to optimize the clearance between the bearing part 12 and the eccentric shaft 18.

Furthermore, the structure can be simplified by using the fixed blade 2 to guide the reciprocating movement of the driver 8 and by attaching a pressing spring to the driver pin.

Incidentally, if the movable blade 5 is guided by a fixed blade and reciprocates, only one driver pin 9 is required.

Further, as shown in FIG. 4, the driver element 8 is configured by shifting the bearing part 12 formed on the bearing member 13 from the center of the driver element 8 provided with the driver pin 9. By shifting, batteries and the like can be stored in the space, and a shape that is easy to use can be easily obtained.

The present invention is constructed as described above, and its operating state will now be described with reference to the operating state diagrams of the driver shown in FIGS. 3 and 5.

The rotational motion of the motor X imparts circular motion to the eccentric shaft 18.

The component of circular motion is in the direction parallel to the reciprocating motion of the movable blade (P)
and the vertical direction (Q), and the vertical direction (the Q component is absorbed by the elasticity of the connecting member 11 and the bearing member 13, and the remaining reciprocating motion is in one direction (the Pi acid component causes the driver 8 to reciprocate).

and gives reciprocating motion to the movable blade 5.

Figure A is a state diagram in which the eccentric shaft 18 and the θ driver 8 are shifted to the right.
Figure C shows a state where the eccentric shaft 18 and driver 8 are shifted to the left, and Figure B
Figures 1 and 2 are diagrams in which the connecting member 11 and the bearing member 13 are deformed and the driver 8 is located at the center.

FIG. 6 shows another embodiment of the driver, in which the driver 8 is formed into a triangular shape by a driving member 10 with a protruding driver pin 9 and a connecting member 11, and a bearing is mounted at the intersection of the connecting member 11. A section 12 is provided.

Since the elastically deformable portion of this structure is linear, it has the effect of being able to bend smoothly.

FIG. 7 shows another embodiment of the driver, in which a connecting member 11 is rotatably connected to a driving member 10 provided with a driver pin 9 with a pin 20, and a bearing member 13 connects the connecting members 11 to each other. A bearing portion 12 is formed on the drive element 8.

By making the connecting member 11 rotatable in this manner, stress on the connecting member 11 can be reduced.

Although not shown, the eccentric shaft 18 may be made into a spherical shape so that the bearing portion 12 and the eccentric shaft 18 are in line contact, or the bearing portion 12 may be made of a thin through hole made of something like sheet metal as shown in FIG. In addition, in the case where the connecting member 11 is rotatably connected to the driving member 10 with a pin 20, even if the connecting member 11 is changed to a rigid one, the bearing portion 12 formed on the bearing member 13 will not move in the direction in which the driver pin 9 protrudes. They swing in the same direction.

As described above, the cutter reciprocating drive device according to the present invention includes a motor housed in a main body case, an eccentric shaft provided on the rotating shaft of the motor, and a drive having a round hole bearing portion into which the eccentric shaft loosely fits. a driver pin protruding from the driver in a direction perpendicular to the axial direction of the eccentric shaft, a comb-shaped movable blade that engages with the driver pin, and a comb-shaped movable blade that slides into contact with the movable blade. The driving element includes a fixed blade and a pressing spring that presses the movable blade against the fixed blade, and a bearing member having the bearing portion is formed on the driving element so as to be swingable in the same direction as the protruding direction of the first driving element pin. Therefore, the rotational motion of the eccentric shaft of the motor is converted into reciprocating motion by a driver equipped with a round hole bearing that can swing freely in a direction perpendicular to the axial direction of the eccentric shaft. This has the effect of always transmitting the rotational motion of the motor smoothly to the movable blade, resulting in low noise.Furthermore, there is a space between the eccentric shaft and the bearing section, unlike conventional cutters in which the eccentric shaft is fitted loosely into the long groove bearing section. Compared to a reciprocating drive device, it does not require clearance and can maintain low noise even during long-term use.Furthermore, since the drive element is engaged with the movable blade, the member to which the drive element is attached can be used easily. This has the effect of simplifying the structure of the cutter and making it smaller.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views of the cutter of the present invention, and FIG.
FIG. 5 is an exploded perspective view of the main parts of the present invention, FIG. 5 is an operating state diagram of one driver, FIG. 4, and FIGS. FIG. 9 is a perspective view of a conventional example. 1...Body case, 2...Fixed blade, 5
...Movable blade, 8...Driver, 9...
...driver pin, 12...bearing part, 13...
...Bearing member, 15...Press it. 17... Morph rotation axis, 18... Eccentric axis, X... Morph.

Claims (1)

[Scope of Claims] 1. A motor housed in a main body case, an eccentric shaft provided on the rotating shaft of the motor, a driver having a round hole bearing portion into which the eccentric shaft loosely fits, and a driver for the eccentric shaft. A driver pin protruding from the driver in a direction perpendicular to the axial direction, a comb-shaped movable blade that engages with the driver pin, a comb-shaped fixed blade that comes into sliding contact with the movable blade, and the movable blade. A reciprocating cutter characterized in that a bearing member having the bearing portion is formed on the drive element so as to be swingable in the same direction as the protrusion direction of the drive element pin. Drive device. 2. The reciprocating drive device for a cutter according to claim 1, wherein the fixed blade guides the reciprocating movement of the driver, and the pressing spring is attached to the driver pin.