JPS58544Y2 - paper cutting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a paper cutting device that is used in a printing device such as a line printer and cuts printed paper.

In a paper cutting device that cuts paper by moving a cutting means such as a circular cutter in left and right directions with respect to the paper running path, conventionally the cutting means is stopped by position detection limit switches installed in both directions of movement. However, when the width of the paper is sufficiently short compared to the moving distance of the cutting means, there is a problem in that the time to actually start cutting the paper is delayed and the cutting processing speed cannot be increased.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to shorten the time at which the next actual cutting starts by stopping the cutting means that has cut the paper immediately after the cutting is completed.

The present invention achieves the above object by installing a detection means so that the time when paper cutting is completed and the time when the end face of the paper to be cut is detected almost coincides, and the cutting means is stopped by this detection signal.

An embodiment of the present invention will be described below with reference to the drawings.

A cutting blade 1 and a drive motor 2 constituting the cutting means are moved in the right (left) direction by a cutting command signal.

This movement causes the paper 3 to be cut.

When the cutting is completed, the dancer roller 4 applies tension to the paper 3, so that the paper 3 moves in the paper running direction, and the optical sensor 5 detects the end face of the paper to be cut, that is, the completion of cutting.

This detection signal generates a cutting blade stop signal, which causes the drive motor 2 and thus the cutting blade 1 to stop.

When the paper 3 is further fed and a cutting command signal is issued again, the cutting blade 1 moves to the left (right) direction by this signal and immediately starts cutting.

When cutting is completed, a cutting blade stop signal is generated by the detection signal of the optical sensor 5 as described above, and the drive motor 2, that is, the cutting blade 1 is stopped.

Since the cutting blade 1 is stopped at a position corresponding to the paper width in this way, the next cutting can be started immediately without moving a useless distance.

When replacing paper, the cutting blade 1 is moved in a certain direction by a paper replacement switch 6 and stopped by a limit switch I.

Figure 2 is a block diagram for executing the above operation, where the signal PWR is a signal generated when the power is turned on, and the signal EOF
” is the signal generated when paper 3 runs out, signal EXC
is the output signal of the paper exchange switch 6, the signal CUT is the cutting command signal, the signal CUTEND is the output signal of the optical sensor 5, and the signal LIMIT is the output signal of the limit switch 7.

When any of the signals PWR, EOF and EXC is generated, the retrigger flip-flop 1 is output via the NOR gate 11.
3 is set, and at the same time, the flip 70 tab 14 is set via the monomarte 16.

As a result, the transistor 18 turns on and energizes the relay 20, forming a forward (reverse) rotation circuit for the drive motor 2.

Therefore, the cutting blade 1 moves to the right in FIG.

When the cutting blade 1 reaches the right end and the limit switch 7 is activated, a signal LIMIT is generated and the flip-flop 14 is reset.

As a result, the drive motor 2 is stopped and the cutting blade 1 is positioned at the right end, eliminating any danger.

In this state, printing and paper feeding proceed, and the cutting command signal CUT
When this occurs, the retrigger flip 70 knob 13 is triggered, and the flip-flop 15 is set to form a reverse (forward) rotation circuit for the drive motor 2.

When the cutting is completed and the signal CU'T END is generated, the flip-flop 15 is reset and the drive motor 2 immediately stops.

From then on, every time the signal CUT is generated, the flip-flop 1
4 and 15 are set alternately to drive the drive motor 2, that is, the cutting blade 1 in a predetermined direction.

According to the present invention, after cutting the paper, the cutting blade stops while keeping a minimum distance from the edge of the paper so as not to interfere with paper travel, and then moves in the opposite direction to actually start cutting the paper. The time can be sped up and the cutting processing time can be reduced.

For example, if the movable distance of the cutting blade is 'fL/ffl, the paper width is 1 (772, the moving speed of the cutting blade is equal to V), and the distance between the edge of the paper and the cutting blade is DcWI, which does not cause any strain on paper running. This will shorten the time it takes.

Now T- = 80cm 1 = 37.5cm D = 4
If cmV = 40cm, the time can be shortened by less than 1 second.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a block diagram. In the figure, 1 is a switching blade, 2 is a drive motor, 3 is paper, 4 is a dancer roller, 5 is an optical sensor, 6 is a paper exchange switch,
7 beam cut switch, 11 is Noah gate, 12 is OR gate, 13 is retrigger flip-flop, 14.15
is a flip-flop, 16 and 17 are monomulti, 18.
19 is a transistor, and 20.21 is a relay.

Claims (1)

[Scope of utility model registration request] a cutting means that cuts the paper by traveling in the lateral direction of the paper; a dancer roller that is provided so as to be able to descend by its own weight and applies tension to the paper; and a dancer roller that is provided between the cutting means and the dancer roller and that cuts the paper. a detecting means for detecting when the trailing edge of a sheet of paper has passed, and the cutting means is stopped by a detection signal from the detecting means.