JPS6253317B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary cutter device that cuts paper or the like using a rotating blade and a fixed blade.

Structure of a conventional example and its problems FIG. 1 is a schematic front view of a conventional rotary cutter device with some parts omitted, and FIG. 2 is a schematic side view of the same device. In each figure, 1 is a rotary blade, which is fixed to a rotatably supported shaft 2. 3 is a fixed blade, which is fixed at the position shown in the figure. Reference numeral 5 denotes a disc fixedly attached to the rotating shaft 6, and is rotated together with the rotating shaft 6 in the direction of the arrow 7. 8
is a swinging arm, the upper end of which is fixed to one end of the shaft 2. A pin 9 provided on the disc 5 is slidably fitted into a long hole 10 formed in the swing arm 8.

The operation of this rotary cutter device will be explained. When the disk 5 is rotated in the direction of the arrow 7, the swinging arm 8 swings in the direction of the arrow 12 using the shaft 2 as a fulcrum, and the rotary blade 1 therefore reciprocates in the direction of the arrow 13. Paper (not shown) passing between the rotary blade 1 and the fixed blade 3 is cut between the blade portion 4 of the rotary blade 1 and the fixed blade 3.

In the conventional rotary cutter device described above, the amount of reciprocating rotation of the rotary blade 1 is determined by the length of the long hole 10 of the swinging arm 8, the distance between the pin 9 and the rotating shaft 6, and the distance between the swinging arm 8 and the disc. There is a problem in that it is difficult to adjust or change because it is related to the relative position of 5.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a rotary cutter device in which the amount of reciprocating rotation of a rotary blade can be easily adjusted and changed.

Structure of the Invention According to the present invention, a first
and a second gear are fixedly installed, and have teeth that mesh with the first gear only in a part of the circumferential direction, and are rotated by meshing with the third gear and the second gear. A fourth gear, which is freely adjustable, and a fifth gear, which has teeth that mesh with the fourth gear in only a part of the circumferential direction and are rotationally driven together with the third gear, are provided. The rotary blade is rotated from the first angle to the second angle by the rotational force transmitted to the shaft by the meshing of the first and third gears, and the rotary blade is rotated from the first angle to the second angle. Due to the rotational force transmitted to the shaft by the meshing of the fifth gear,
The rotary blade is reversely rotated from the second angle to the first angle.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 3 is a schematic plan view of a rotary cutter device according to an embodiment of the present invention. In this figure, 21 is a shaft rotatably supported by frames 22 and 23. A rotary blade 24 is fixed to this shaft. 25 is a blade portion provided on the rotary blade 24. In the vicinity of 24, as shown in Fig. 4 (-
The fixed blade 26 is fixed in a positional relationship as shown in the cross-sectional view taken along the line ''.

Referring again to FIG. 3, the shaft 21 has gears 28, 2.
9 is fixedly installed. 31 is a shaft fixed to the frame 22, and a gear 32 that meshes with the gear 29 is rotatably supported on this shaft 31.

34 is a motor, and a one-way clutch 36 is provided on its rotating shaft 35. A rotating shaft 37 is rotatably supported by the frame 23, and a gear 38 that meshes with the teeth of a one-way clutch 36 is fixedly mounted on the rotating shaft. The one-way clutch 36 transmits only the rotational force of the motor rotating shaft 35 in the direction of the arrow 39 to the gear 38.
Therefore, the rotating shaft 39 of the motor 34 is aligned with the arrow 39.
When rotated in the direction, the rotating shaft 37 is rotated in the direction of the arrow 40.

The rotating shaft 37 receives its rotational force through gears 28 and 32.
Gears 41 and 4 for intermittently transmitting data to
2 is permanently installed.

FIG. 5 is a plan view of the gear 41. As shown in this figure, the gear 41 does not have teeth formed over its entire circumference, but only within the range of angle A.
Teeth 41a that mesh with 8 are formed.

FIG. 6 is a plan view of the gear 42. As shown in this figure, this gear 42 is formed with teeth 42a that mesh with the gear 32 within an angle B range.

The gears 41 and 42 are arranged at angles such that during the period when the gears 28 and 41 are meshed, the gears 32 and 42 are not meshed, and conversely, when the gears 32 and 42 are meshed, the gears 28 and 41 are meshed. It is attached to the rotating shaft 37 for this reason.

Next, the operation of this rotary cutter device will be explained. The paper 43 (Fig. 4) to be cut is the arrow 47.
During the period of conveyance in the direction, the rotary blade 24 remains stationary at an angle shown by a solid line in FIG.

When the cutting position of the paper 43 reaches the position of the fixed blade 26, the motor 34 is activated and its rotating shaft 35 rotates in the direction of the arrow 39.
8 in the direction of arrow 40. First, the teeth 41a of the gear 41 mesh with the gear 28 and rotate in the direction of the arrow 40, and the rotary blade 24 is rotated together with the rotating shaft 21 in the direction of the arrow 44. Rotary blade 2
When the blade portion 4 passes the tip of the fixed blade 26, the paper 43 is cut.

When the rotary blade 24 rotates to the angle shown by the chain line 45 in FIG.
a and the teeth of the gear 32 mesh with each other. Therefore, as the rotating shaft 37 rotates, the rotating blade 24 moves along the arrow line 46.
rotated in the direction When the rotary blade 4 reversely rotates to the position shown by the solid line in FIG. 4, the gears 32 and 42 are disengaged, and the gears 28 and 41 are disengaged. At this point, motor 34 is stopped. This completes one cutting operation.

In the rotary cutter device of this embodiment, as is clear from the above description, the gears 41,
The angle A where the 42 teeth 41, 42b are provided,
By changing B and the number of teeth, the rotary blade 24
The amount of reciprocating rotation can be finely adjusted. Also, by simply replacing gears 41 and 42, the rotary blade 2
The amount of reciprocating rotation of 4 can be easily changed.

Note that the present invention is not limited to the above embodiments. For example, the gears 28, 29 and the gears 41, 42 may be integrated, respectively. Further, it is also possible to directly drive the rotating shaft 37 to rotate with a motor.

Effects of the Invention As explained above, the present invention utilizes two gears partially having teeth in the circumferential direction to rotate the rotary blade back and forth, so the amount of reciprocating rotation of the rotary blade can be finely and precisely controlled. The effect is that it can be easily adjusted and changed.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view with some parts omitted of a conventional rotary cutter device, FIG. 2 is a schematic side view of the same rotary cutter device, and FIG. 3 is a schematic side view of the rotary cutter device according to an embodiment of the present invention. A schematic plan view with some parts omitted, Fig. 4 is a sectional view taken along the line -' in Fig. 3, Fig. 5 is a plan view of one gear for intermittent drive, and Fig. 6 is a plan view of the other gear for intermittent drive. FIG. 21... Axis, 22, 23... Frame, 24...
...Rotating blade, 26...Fixed blade, 28, 29, 32,
36, 41, 42...Gear, 34...Motor, 3
5... Motor rotation axis, 37... Rotation axis.

Claims (1)

[Claims] 1. A rotatably supported shaft, a rotary blade fixed to the shaft, a fixed blade provided close to the rotary blade, and first and second gears fixed to the shaft; a rotationally driven third gear having teeth that mesh with the first gear only in a part of the circumference; a fourth gear that meshes with the second gear and is rotatable; A fifth gear has teeth that mesh with the gear only in a part of the circumferential direction and is rotationally driven together with the third gear, and by the meshing of the first and third gears, A rotational force for rotating the rotary blade from a first angle to a second angle is transmitted to the shaft, and the second, fourth, and fifth gears mesh to rotate the rotary blade to the second angle. A rotary cutter device configured to transmit rotational force for reverse rotation from a second angle to a first angle to the shaft.