JPS594279B2 - rotary cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary cutter used for feeding and cutting rolled paper, film, etc. into any suitable size.

Conventionally, solenoids have been widely used to drive such rotary cutters because they are inexpensive and easy to handle.

FIG. 1 shows an example of such a conventional rotary cutter, in which a fixed blade 1 is rotatably supported by a support shaft 3, and is supported by a tension spring 5 via a pin 4. The cutting edge is pressed against the rotary blade 2. The arm 16 integrally attached to one end of the shaft of the rotary blade 2 is connected to the link 175.
The return spring 18 is connected to the plunger type solenoid 13 by the solenoid 13, and a return spring 18 is attached in a direction facing the solenoid 13. In the rotary cutter configured in this way, when a voltage is applied to the solenoid 13, the solenoid 13 moves in the suction direction, the rotary blade 2 rotates via the link IT and the arm 16, and the fixed blade 1 and the rotary blade 2 (not shown).

(hereinafter referred to as paper). When the voltage applied to the solenoid 13 is removed, the cutter: 5 is activated by the return spring 18.
returns to its original position. Due to its mechanism, a rotary cutter inevitably temporarily blocks the passage of paper with its rotating blade during cutting.

Therefore, there is no problem if cutting is performed while the paper is stationary, but if cutting is performed while the paper is running, there will be no problem while the rotary blade blocks the path during cutting. The paper fed into the rotary blade is temporarily stored in front of the rotary blade as a deflection. Therefore, in order to cut the paper with a rotary cutter without any trouble while the paper is running, the cutting operation of the rotary blade should be performed as quickly as possible, and the deflection that occurs in front of the rotary blade during cutting should be avoided to prevent the paper from becoming cut. It is necessary to keep it to a minimum so as not to interfere with feeding and cutting.

By the way, in the conventional rotary cutter shown in FIG. 1, the operating speed of the rotary blade is slowed down mainly due to the following two factors. (1) Mechanical response delay due to the inertial mass of the drive system including the rotating blade (2) Electrical response delay due to solenoid inductance (
1) In FIG. 1, the rotary blade 2, the arm 116,
This is a delay in response due to mechanical causes due to the reciprocating inertia mass that moves integrally with the operation of the rotary blades such as the link 17 and plunger 13. The response delay in (2) is due to the self-induction of the solenoid coil. This is due to an electrical cause: the response of the current flowing through the solenoid coil is delayed compared to the opening and closing of the solenoid, and therefore the operation of the solenoid is also delayed.

Therefore, in the conventional rotary cutter as shown in FIG.
It is necessary to increase the recovery force due to the The delay in electrical response becomes greater, and the result is that the rotary blade does not necessarily operate quickly. Conversely, a solenoid with a small inductance will generally have a small suction force, and will not necessarily produce good results.

The above-mentioned tendency is not limited to the case of the example shown in Fig. 1, but is common to rotary cutters having a structure driven by a solenoid and a return spring.
If the paper traveling speed is 30ml/second or more,
It is difficult to perform the cutting and the subsequent feeding of the paper without any problems.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the conventional rotary cutter described above and to provide a rotary cutter that can cut paper while it is running at a higher speed. The present invention utilizes a toggle link to obtain reciprocating rocking motion of the rotary blade only during the suction stroke of the solenoid, thereby reducing the reciprocating sliding mass and eliminating the effects of delayed electrical response of the solenoid. .

To explain the present invention with reference to drawings, in FIG. 2, a link 7 and a link 8 are connected in series to an arm 6 integrally attached to the shaft of the rotary blade 2, and one end of the link 8 is connected to a fixed pin. 9
Rotatably attach to. Plunger solenoids 14 and 15 connected to solenoid mounting links 10 and 11, respectively, are arranged at opposing positions at the connection point between the link 7 and the link 8. In the rotary cutter configured as described above, when voltage is applied to the solenoid 14, the solenoid 14 moves in the suction direction, rotates the link 8 around the fixing pin 9 through the link 10, and connects the link 7.
and starts rotating the rotary blade 2 in the cutting direction via the arm 6.

When the link 7 and the link 8 are in a straight line, the rotary blade 2 rotates the most, and if the solenoid 14 further moves in the suction direction thereafter, the rotary blade 2 changes its rotation direction and starts rotating in the return direction. That is, only by moving the solenoid 14 in the suction direction, the rotary blade 2 performs reciprocating rocking rotation and completes the cutting and returning operations. For the next cutting operation, when a voltage is applied to the solenoid 15, the rotary blade 2 is similarly driven.

The spring 12 is for keeping the rotary blade 2 in a steady position, and does not need to be as strong as the return spring 18 in the conventional rotary cutter shown in FIG.

As explained above, the rotary cutter according to the present invention has two solenoids driven alternately.
The only thing that cuts paper is the rotary blade and arm that rotate back and forth, and there is no need for a strong spring for return.

The reciprocating inertial mass is thus minimized and the rotary blade can operate at higher speeds. In other words, in the conventional rotary cutter shown in Fig. 1, the drive system, including the rotary blade, solenoid, and spring, all perform reciprocating motions of cutting and returning during each cutting operation. In order to achieve this, it is first necessary to keep the voltage application time to the solenoid to the minimum necessary limit, and the reciprocating inertial mass is large, and due to the influence of the solenoid's inductance, it is difficult to actually start the return operation even after the voltage is cut off. In contrast, with the rotary cutter of the present invention, only the rotary blade and arm move back and forth, and the return operation of the solenoid is not required, so the voltage application time to the solenoid can be reduced. There is no need for particularly strict control, and a delay in the return operation of the solenoid itself due to the inductance of the solenoid has no effect on the reciprocating speed of the rotary blade. In the rotary cutter of the present invention, an increase in inertial mass due to the use of two solenoids is unavoidable, but since these increased masses do not perform the return operation, the high-speed operation of the rotary blade, which is the purpose of the present invention, cannot be avoided. That is, it has little effect on shortening the interruption time of the paper path. The present invention has the advantage that it is possible to obtain a rotary cutter which has a simple structure using toggle links and can cut paper without any trouble while traveling at a speed approximately twice as high as that of conventional ones. .

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional rotary cutter, Figure 2 is a perspective view showing a conventional rotary cutter.
The figure is a perspective view showing an embodiment of a rotary cutter according to the present invention. 1: Fixed blade, 2: Rotating blade, 5: Fixed blade pressing spring, 6:
Arms, 7, 8, 10, 11: Connection, 14, 15: Solenoid.

Claims (1)

[Claims] A rotary cutter consists of a rotary blade whose shafts at both ends are rotatably supported, and a fixed blade whose cutting edge is pressed against the rotary blade by a spring. Two connections are connected in series between a pin fixed at a certain distance from the shaft and a pin at the tip of the arm, and two solenoids are connected to the pin at the central connection point of the two connections. A rotary cutter characterized by a structure in which the two links are arranged facing each other so as to be driven in a direction perpendicular to the joining direction of the two links via another link.