JPH03251390A - Sheet cutting device and recording device having sheet cutting device - Google Patents

Abstract

PURPOSE:To continuously use a cutting device by installing a supporting means which can shift in a prescribed direction and in the reverse direction and installing two cutters for carrying out cutting during the transfer in the normal and reverse directions and a means for detecting the deterioration of the cutter and carrying out cutting only by one cutter according to the above-described detection. CONSTITUTION:Rotary cutters 1a and 1b are supported rotatably on a carriage 1, and the carriage 1 is moved in reciprocation by driving a driving motor 2 in the normal and reverse directions, and the cutter 1a or 1b cuts a sheet. When the carriage 1 is at the right edge, a microswitch 43 is turned ON, and cutting operation is carried out through the left side shift, and when the carriage 1 is at the left edge, a microswitch 42 is turned ON, and the cutting operation is carried out through the right side shift. The cutting time for the left or right side transfer is caught by the above-diescribed two switches 42 and 43, and each degree of deterioration of the left and right cutters 1a and 1b is compared from the cutting operation time. When the cutting time on one cutter is longer over a prescribed value than the other, it is judged that the cutter having the longer cutting time is deteriorated, and the cutting operation is carried out only in one direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sheet cutting device for cutting a rolled sheet into a predetermined size in an image recording device or the like.

[Prior Art] FIG. 9 shows an example in which a conventional sheet cutting device is applied to an image recording device. The rolled recording paper 37 is fed by a paper feed roller 36, the paper feeding timing is adjusted by a registration roller 34, and the paper is conveyed to the position of a head 33, which is a recording means. Each time a scan is completed, it is transported by one sub-scanning distance. Here, a microcomputer (not shown) manages the feed amount of the sub-scanning, and when the rolled recording paper 37 has been conveyed a predetermined amount, a reciprocating cutter 35 as a sheet cutting device is operated to cut the recording paper.

Next, an example of a reciprocating cutter is shown in FIG.

A reciprocating cutter is a rotary cutter that cuts recording paper 44.
45, a cutter unit 46 that rotatably supports this rotary cutter 44.45, a motor 21 for moving this cutter unit 46, a pulley 47, and a pulley 21a and a pulley 47 fixed to the output shaft of the motor 21. It consists of a wire 48 that is wound around and connected at both ends to the cutter unit 46, and microswitches 42 and 43 for detecting the position of the cutter unit. The rotary cutters 44 and 45 of the cutter unit 46 are
Since each cutter has a different angle to facilitate cutting when moving in the left and right directions, it is difficult to cut in both the left and right directions with a single rotary cutter. When cutting the recording paper, if the cutter unit 46 is on the right side, the motor 21 is rotated in the direction in which the cutter unit 46 moves to the left, the recording paper is cut with the rotary cutter 44 on the left side, and the micro switch 42 Detects the end of cutting and stops the motor rotation. Next, when cutting the recording paper, move the cutter unit to the right.

By moving in both left and right directions and cutting with separate rotary cutters, the life of the cutter unit can be approximately doubled compared to using only one rotary cutter and cutting in only one direction. Become.

[Problems to be Solved by the Invention] However, if the cutting is performed by separate rotary cutters in both left and right directions, when one rotary cutter cannot cut, even if the other rotary cutter Even if the cutter unit is usable, the device becomes unusable, and the user cannot use the device until a service person or the like replaces the cutter unit.

[Means (and actions) to solve the problem: If one blade deteriorates and becomes less sharp, the sheet cutting device can be continued to be used by using only the other blade that has not deteriorated. It has been made possible.

The structure of the present invention for achieving the above object includes a support means movable in a predetermined direction and a direction opposite to the predetermined direction, which crosses a sheet conveyance path; a first blade for cutting the sheet; a second blade for cutting the sheet when the support means moves in a direction opposite to a predetermined direction; and a detection means for detecting a deterioration state of the first and second blades. The sheet cutting device is characterized in that the sheet cutting device is configured to cut the sheet using only one of the first or second blades in response to detection by the detection means.

[Embodiment] FIG. 3 shows an image recording apparatus to which the present invention is applied. Components that are the same as those of the conventional example are designated by the same reference numerals as those in FIG. 1, and the description thereof will be omitted.

The detailed configuration of the reciprocating cutter 100 shown in FIG. 3 is shown in FIGS. 1 and 2.

1 and 2 show an embodiment of the present invention.

Rotary cutters 1a and lb are rotatably supported by a carriage 1, and both ends thereof are connected to a wire 3. The wire 3 passes around the driving pulley 7 and the driven pulley 8, and is connected to a tension spring 9, so that it is kept under tension with a constant force. Here, by driving the drive motor 2 forward or backward, the carriage 1 is moved to the guide rail 5.
The sheet material existing in the gap 4 is sandwiched between the rotating cutter 1a or 1b and the fixed blade 6 and cut.

FIG. 4 shows a block diagram of the above embodiment, and FIGS. 5 and 6 show flowcharts.

In FIG. 4, 50 is a control circuit, 51 is a memory, and 52 is a motor driver.

In FIG. 5, first, it is detected whether the cutter unit 1 is located at the right end or the left end (step ■). If the cutter unit 1 is located at the right end, the C micro switch 43 is turned ON). (cutting by moving the cutter unit from the left end to the right) (Step B), and if it is located at the left end, a right cut (cutting by moving the cutter unit from the left end to the right) (Step A). An example of cut control is shown below.

Here, the cutting operation is shown when the cutter unit 100 is on the right side, and the same can be considered when the cutter unit 100 is on the left side (right cut). In the cutting operation, first, the cutter unit 100
drive to the left. Next, when the left microswitch 42 detects the cutter unit 46, that is, when it detects that cutting has been completed, the drive of the cutter unit is stopped (step Sl). Here, the left micro switch 4
2, if it is not detected, it is checked whether a second has not elapsed since the start of driving (step S2). This a second is about 1.5 times the cutting operation time from unit drive to switch detection when the cutting operation is performed normally.If the cutting operation takes more than a second, the left side It is determined that the rotary cutter 1a has deteriorated, and a warning display indicating that the cutter has deteriorated in the left direction is displayed, and information indicating that the rotary cutter 1a has deteriorated is recorded in the RAM 51 backed up by a battery (step S3). Furthermore, it is confirmed that b seconds have not elapsed since the start of driving (step S4).

This b seconds is about three times the normal cutting operation time, and if no detection is detected after b seconds, it is determined that the left direction of the cutter cannot be used, and the drive of the unit is stopped.
A cutter defect is displayed (step S5).

If the switch is detected within b seconds, the curling operation has ended, and the process returns to step S1 to stop driving the unit (step S6). Next, R is backed up by a battery to check whether the rightward rotating cutter 1b has deteriorated or not.
If it is confirmed by recording during AM (step S7) that there is no deterioration, the cutting operation is ended there, and next time the cutting operation is performed on the right side. If it has deteriorated, the degree of deterioration on the left and right sides is compared based on the cutting operation time (step S8). If the time to cut to the right is longer than the time to cut to the left, that is, if the right side is worse than the left,
After the recording paper is ejected, the cutter unit is moved to the right so that the cutting operation is performed in one direction on the right (step S9).
).

In this way, if it is detected that the cutter in one direction has deteriorated, the cutter in the other direction is used, and a warning is displayed to indicate that the cutter has deteriorated.
Users can notify service personnel of equipment deterioration before the equipment becomes unusable, allowing for smooth equipment operation.

[Other Embodiments] FIG. 7 shows a configuration diagram of another embodiment. The motor 21 is for driving the cutter unit, and includes motors CP, U26 to l10.
When a motor ON signal is issued via the motor driver TC 25, the signal becomes the motor drive voltage Vdd and rotates the motor 21.

At this time, a voltage is generated across the current detection resistor 23 that is proportional to the current flowing to the motor driver IC 22, that is, the motor drive current. As the cutter deteriorates, the load on the motor increases, so the degree of cutter deterioration can be determined from the motor drive current. That is, by detecting the voltage V□ across the current detection resistor 23, it is possible to determine whether the cutter has deteriorated. This voltage V□ during cutter operation is determined by a comparator 24 as a deterioration special voltage V re
f and if Vref<VII, it is determined that the operating direction of this cutter has deteriorated, and a warning of cutter deterioration is displayed, and the CPU 26 instructs the CPU 26 to use only the cutter in the direction that has not deteriorated. Control.

Next, the recording means 33 will be explained. The recording means 33 in this embodiment uses a serial bubble jet recording method, as shown in FIG.

The carriage 33a has guide rails 5b fixed at both ends.
It is attached so that it can be slid along. Following,
When a carriage motor (not shown) is rotated in forward and reverse directions, the carriage 33a reciprocates along the guide rail 33b.

Further, a recording head 33g is mounted on the carriage 33a. As shown in FIG. 8, this recording head 33g has an ink reservoir 33g1 filled with ink and a large number of liquid channels 33g2 arranged in a line in the vertical direction of FIG.

In a steady state, the surface tension and external pressure of the ink filled in the liquid path 33g2 are balanced on the orifice surface.

Further, each of the plurality of liquid paths 33g2 is provided with an electrothermal transducer (not shown), and by energizing this in accordance with an image signal, ink is ejected from the orifice and an ink image is formed on the recording sheet 1. It is to be recorded.

That is, when the electrothermal converter is energized, the liquid path 33g
A rapid temperature rise occurs in the ink inside 2, exceeding nucleate boiling.
The ink evaporates and causes film boiling. As a result, bubbles are formed in the ink in the liquid path 33g2, and as the bubbles grow, ink droplets are ejected from the orifice surface onto the recording sheet 5, thereby recording an ink image. When the energization is finished, the bubbles in the liquid path 33g2 are cooled and contracted by the ink, and ink is supplied into the liquid path 33g2 from the ink reservoir 33g1 by capillary action to prepare for the next energization.

Therefore, by energizing the electrothermal transducer in synchronization with the movement of the carriage 33a and in accordance with the image signal,
An ink image is recorded on a recording sheet 1.

A platen 31 for supporting the back surface of the recording sheet S is disposed at a position opposite to the orifice surface of the recording head 33g. Then, the recording sheet S to which a conveying force is applied by the rotation of the conveying roller 32 is transferred to the recording head 33.
However, since the sheet S is prevented from rising from the surface of the platen 31 by the suction means, the orifice surface and the recording sheet S
A constant distance is always maintained between the two.

[Effects of the Invention] As explained above, in the present invention, even if one blade deteriorates, the sheet cutting device can continue to be used by using only the other blade.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of a sheet cutting device according to the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is an image recording device equipped with a sheet cutting device, and FIG. 4 is a control block diagram. , FIG. 5 and FIG. 6 are flowcharts, FIG. 7 is a diagram showing another embodiment, FIG. 8 is a diagram showing a recording means, and FIG. 9 and FIG. 10 are diagrams showing a conventional example. la and Ib are rotary cutters, 2 is a drive motor, 7 is a drive pulley, and 33 is a recording head. 683- -684- et

Claims (2)

[Claims] (1) a support means that is movable in a predetermined direction and a direction opposite to the predetermined direction, which traverses the sheet conveyance path; and a first blade that cuts the sheet when the support means moves in the predetermined direction; a second blade that cuts the sheet when the support means moves in a direction opposite to the predetermined direction; a detection means that detects the deterioration state of the first and second blades; A sheet cutting device characterized in that the sheet is cut by only one of the first and second blades. (2) A recording device comprising: the sheet cutting device according to claim 1; and recording means for recording an image on a sheet conveyed through the sheet conveyance path using ink droplets generated by thermal energy.