JPH10180685A - Cutter control circuit and facsimile device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the software burden of a CPU by producing, from a signal for instructing a movement to one side and a signal indicating detection of reaching of one specified position of a cutter, a signal for instructing a movement to the other and applying a brake on the cutter. SOLUTION: A detecting signal/CUTL of a left sensor SL and a detecting signal/CUTR of a right sensor SR are inputted to a control circuit 41. The waveforms of the detecting signals/CUTL and /CUTR are shaped and, from the control circuit 41, a left standby position signal /CISL and a right standby position signal /CISR respectively indicating the left and right standby positions of a cutter are provided to a CPU 1. Then, if a left driving control signal CDRVL from the CPU 1 to the control circuit 41 is 0 and a right driving control signal CDRVR is 1, a left driving instruction signal CDL becomes A and a right driving instruction signal CDR becomes L, the cutter is driven in a right direction by forward driving a DC motor 53, and a brake is applied on the cutter when signals CDL and CDR are both L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit for driving a cutter for cutting a recording sheet in a facsimile machine or the like, and a facsimile machine.

[0002]

2. Description of the Related Art In recent years, facsimile machines have become widespread, but heat-sensitive roll paper is mainly used as recording paper in relatively low-priced ones that are mainly used for home use. This is because thermal printers are used instead of laser printers in order to lower the price of the facsimile machine itself, but in the lowest price facsimile machine the user cuts the recorded thermal roll paper by himself. It has become. However, a facsimile machine at a slightly higher price range is provided with a cutter for cutting the thermal roll paper. There is also a facsimile apparatus for recording on a plain paper roll by a thermal transfer printer, but the configuration of the cutter portion is basically the same.

Although various types of facsimile cutters as described above have been put into practical use, a rotary cutter system is often used because of its relatively simple structure and low cost. The rotary cutter places the paper on a flat fixed blade, and the disk-shaped rotary blade is placed on the fixed blade near one of the paper discharge ports from one end to the other end in a direction orthogonal to the paper conveyance direction. The paper is cut by rolling as the cutter moves toward the paper.

[0004]

When the cutter having such a rotary blade is moved, it is necessary to perform braking control at both ends of the moving range of the cutter. For this reason,
In the conventional facsimile machine, sensors are arranged at both ends of the moving range of the cutter, and processing for monitoring the detection state of the sensor by software is required. In some cases, processing was affected. For this reason, control by mechanical means may be considered, but in that case, there has been a problem that delicate mechanical adjustment such as a mounting position of the sensor is required.

When an error occurs in which the cutter does not move, a countermeasure is taken depending on whether the cutter itself does not move due to a failure in the drive system of the cutter, or whether the cutter cannot move due to a paper jam. Although the method is different, it has not been clear which error has occurred in the past.

[0006] The present invention has been made in view of such circumstances, and only instructs the start of driving of a cutter when it is necessary to cut paper as necessary in terms of software, in other words. The purpose of the present invention is to provide a cutter control circuit.

It is another object of the present invention to provide a facsimile apparatus which can easily determine the occurrence of an abnormality in the control by the cutter control circuit.

[0008]

SUMMARY OF THE INVENTION A cutter control circuit according to the present invention is a cutter control circuit for braking a cutter when both signals instructing movement in both directions are given. In response to the movement instruction, the signal for instructing movement to one side and the signal for detecting that one of the cutters has reached the predetermined position are generated, and the signal for instructing movement to the other side is generated, thereby braking the cutter. It is characterized by having means for adding.

In such a cutter control circuit of the present invention,
A signal instructing movement to one side in response to an externally given movement instruction to one side and a signal indicating detection of arrival of the cutter at one predetermined position are hard-coded. It is generated as wear and brake is applied to the cutter.

In the facsimile apparatus according to the present invention, even when a predetermined time has elapsed from the time when the cutter for cutting the recording paper is instructed to move to one of the cutters, if the cutter does not reach one of the predetermined positions, the cutter is moved to the other. , And when the arrival of the cutter at the other predetermined position is detected by the elapse of a predetermined time thereafter, it is determined that an abnormality has occurred.

Further, the facsimile apparatus according to the present invention provides a facsimile apparatus in which, even when a predetermined time has passed from the time when the cutter for cutting the recording paper is instructed to move to one side, the arrival of the cutter at one predetermined position is not detected. , And when the arrival of the cutter at the other predetermined position is not detected even after a predetermined time has elapsed, it is determined that an abnormality has occurred.

In such a facsimile apparatus of the present invention, even when a predetermined time has elapsed from the point in time when the movement of one of the cutters was instructed, if the arrival of the cutter in one of the predetermined positions is not detected, the movement to the other is instructed. Then, the occurrence of different types of abnormalities is determined depending on whether or not the arrival of the cutter at the other predetermined position is detected by the elapse of the predetermined time thereafter.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments.

FIG. 1 is a schematic diagram for explaining the configuration and operation of a rotary cutter type cutter unit to be controlled by a cutter control circuit according to the present invention. In FIG.
Reference numeral 51 denotes a fixed blade that also serves as a guide for the sheet P, and the sheet P is conveyed on the fixed blade 51 in the direction of a white arrow. Reference numeral 53 denotes a DC motor, and a screw rod 54 is coaxially connected to the motor shaft. The screw rod 54 is arranged so that its axial direction is orthogonal to the paper P transport direction and parallel to the fixed blade 51.

Reference numeral 52 indicates a cutter head.
A female screw hole is provided to penetrate so that the screw rod 54 is screwed. A rotary blade 55 whose rotation axis is parallel to the transport direction of the paper P is rotatably attached to the cutter head 52. The rotation of the screw rod 54 in the rotation direction of the cutter head 52 is regulated by regulating means (not shown), and the rotary blade 55 is urged toward the fixed blade 51 with respect to the cutter head 52. Therefore, when the motor shaft of the DC motor 53 rotates in either direction, the cutter head 52 moves along the axial direction of the screw rod 54 with the cutting edge of the rotary blade 55 pressed against the fixed blade 51. Accordingly, since the rotary blade 55 rolls with the blade edge pressed against the fixed blade 51, the paper P placed on the fixed blade 51 is cut in a direction orthogonal to the transport direction.

A right sensor SR and a left sensor SL for detecting the position of the cutter head 52 are disposed at both ends of the movable range of the cutter head 52 on the fixed blade 51, respectively. In each of these sensors SR and SL, a leaf spring SRS and SLS is arranged at a position where the cutter head 52 comes into contact with the sensor SR.
Although the details will be described later, the circuit configuration is such that when the cutter head 52 comes into contact with the leaf springs SRS, SLS, the electrical contacts of the limit switches provided therein are brought into a non-contact state.

FIG. 2 is a functional block diagram showing an example of the configuration of a facsimile apparatus of the present invention in which the above-described cutter control circuit (hereinafter referred to as the circuit of the present invention) is incorporated.

In FIG. 2, reference numeral 1 denotes a CPU (central processing unit) functioning as a control unit of the facsimile apparatus, and a ROM (Read) which stores a program for controlling the operation of the entire facsimile apparatus in advance. Only Memor
y) 2 and a RAM (Random Access Memory) 3 functioning as a storage unit for storing data required for control by the CPU 1 or data that needs to be temporarily stored during operation.

The CPU 1 has an NCU (Network Control Unit).
nit) 4 and modem 5 are connected. NCU 4 is CPU 1
, And controls the connection between the line L and the facsimile machine, and has a function of transmitting a dial pulse corresponding to the telephone number of the communication partner and a function of detecting an incoming call. The line L is connected to a general public telephone line (not shown). The modem 5 modulates and demodulates the transmission / reception data, specifically, modulates the transmission data into an audio signal.
Sends out to line L via NCU 4 and vice versa
The audio signal received via U4 is demodulated into a digital signal.

The CPU 1 is further connected to a reading unit 6, an image memory 7, a codec 8, a recording unit 9, an operation unit 10, a display unit 11, and the like. The reading unit 6 reads a document image using, for example, a CCD image sensor. The image memory 7 stores image data read by the reading unit 6 and image data received from outside via the line L and the modem 5. The codec 8 encodes the image data to be transmitted and decodes the received image data. Recorder 9
Records received image data or image data read by the reading unit 6 on recording paper (paper P). The operation unit 10 includes ten keys for inputting numbers such as telephone numbers, one-touch keys, abbreviated keys, operation keys for instructing various operations, and the like. The display unit 11 includes a CRT display or an LCD (Liquid Crystal Display) that displays various information such as a telephone number input by operating the operation unit 10. .

Reference numeral 40 denotes a cutter control unit as a circuit of the present invention, which is connected to the CPU 1 and has the same configuration as that of FIG.
Cutter unit 50, more specifically the DC motor 5
3. Connected to both sensors SR, SL. When the CPU 1 receives the facsimile signal and determines that it is necessary to cut the paper P when the facsimile signal is recorded on the paper P by the recording unit 9, the CPU 1 sends a predetermined control signal to the cutter control unit 40, which will be described later. Output. In accordance with a predetermined control signal output from the CPU 1, the cutter control unit 40 drives and controls the cutter unit 50 to cut the paper P.

FIG. 3 shows the CPU 1, the cutter control unit 40 and the cutter unit.
FIG. 5 is a block diagram showing a connection relationship with the 50. Cutter control unit
40 includes a control circuit 41 and a motor drive circuit 42. Control circuit
41 shows the detection signal / CUTL of the left sensor SL and the right sensor SR
Detection signal / CUTR is input. Note that these signals
Both / CUTL and / CUTR are negative logic, meaning significant when "0" and meaningless when "1". In other words, both signals / CUTL and / CUTR are "
0 ", and" 1 "in the non-detection state.

From the control circuit 41 to the CPU 1, a left standby position signal / CIS indicating that the cutter is at the left or right standby position.
L, the right standby position signal / CISR is given. Note that these signals / CISL and / CISR are also negative logic, and are generated by shaping the waveform of the detection signal / CUTL of the left sensor SL and the detection signal / CUTR of the right sensor SR. The left driving control signal CDRVL and the right driving control signal CDRVR for instructing the driving of the DC motor 53 are supplied from the CPU 1 to the control circuit 41. The control circuit 41 supplies the motor drive circuit 42 with a left drive instruction signal CDL for actually driving the DC motor 53 leftward and a right drive instruction signal CDR for driving the DC motor 53 rightward. These left drive instruction signals CD
Motor drive circuit according to L or right drive instruction signal CDR
42 to DC motor 53 left drive output OUTL or right drive output OU
TR is output.

FIG. 4 shows a left standby position signal / CISL and a right standby position signal input and output between the cutter control unit 40 and the CPU 1.
/ CISR, left drive control signal CDRVL, right drive control signal CDRVR
And the value of the left drive output OUTL and the right drive output OUTR output from the motor drive circuit 42 to the DC motor 53 ("1" or "1").
0 "," H ", or" L ") and the state of the cutter indicated by each, or the control state instructed, and will be briefly described below.

When the detection signal / CUTL of the left sensor SL is "0" (ON) and the detection signal / CUTR of the right sensor SR is "1" (OFF), the cutter is at the left standby position. The detection signal / CUTL of the left sensor SL and the detection signal / CUTR of the right sensor SR are both "
If it is 1 "(off), the cutter is at a position other than the left standby position or the right standby position, that is, at a position (center) between both standby positions. The detection signal / CUTL of the left sensor SL is"".
1 ”(OFF), the detection signal / CUTR of the right sensor SR is“ 0 ”
If it is (ON), the cutter is at the right standby position.

The left drive control signal CDRVL and the right drive control signal CD
When both RVRs are "0", the DC motor 53, in other words, the cutter is in a free state, that is, in a standby state regardless of the position at that time. When the left drive control signal CDRVL is “0” and the right drive control signal CDRVR is “1”, the left drive instruction signal
CDL becomes “H”, the right drive instruction signal CDR becomes “L”,
The cutter is driven rightward (the DC motor 53 is driven to rotate forward). Conversely, if the left drive control signal CDRVL is "1" and the right drive control signal CDRVR is "0", the left drive instruction signal CDL
Becomes “L”, the right drive instruction signal CDR becomes “H”, and the cutter is driven leftward (the DC motor 53 is driven in reverse rotation).
. Note that both left drive control signal CDRVL and right drive control signal CDR
When both VR are “1”, both the left drive instruction signal CDL and the right drive instruction signal CDR become “L”, and the DC motor 5
3, In other words, the cutter enters the braking (braking) state.

Next, the operation of the facsimile apparatus of the present invention,
That is, the cutter control by the CPU 1 will be described with reference to the flowcharts of FIGS.

First, when the power is turned on, the CPU 1 checks the status of both standby position signals / CISL and / CISR (step S1).
If both are not "1"("NO" in step S1), in other words, if either is "0", the cutter is located at the left or right standby position, but it is not. In some cases ("YES" in step S1), the cutter is located at an intermediate portion other than the both standby positions.
The CPU 1 drives the DC motor 53 in the reverse direction, that is, sets the left drive control signal CDRVL to "1" to move the cutter to an initial position, for example, a left standby position (step S2).

Here, the CPU 1 outputs, for example, a left standby position signal / C
The state of the ISL is checked again (step S3). When the left standby position signal / CISL is “0” (“YES” in step S3)
The CPU 1 determines that the cutter is at the left standby position, and when the left standby position signal / CISL is “1” (“YES” at step S3).
NO "), the CPU 1 determines that the cutter is at the right standby position. In this state, if it is necessary to drive the cutter, that is, if it is necessary to cut the paper P (step S11 or S21). "YES"), the CPU 1 drives the cutter right or left (steps S12, S22).

When it is determined in the previous step S3 that the cutter is at the left standby position ("YES" in step S3),
The CPU 1 drives the DC motor 53 in the normal direction by setting the right drive control signal CDRVR to “1” and starts driving the cutter in the right direction (step S12). Monitors whether / CISR becomes “0” (step
S13, S14). On the other hand, if it is determined in the previous step S3 that the cutter is at the left standby position ("N" in step S3)
O ”), the CPU 1 sets the left drive control signal CDRVL to“ 1 ”, thereby driving the DC motor 53 in the reverse direction to start driving the cutter in the left direction (step S22). Monitors whether the standby position signal / CISL becomes “0”
(Steps S23, S24).

After starting driving the cutter in the right direction, 1
If the cutter reaches the right standby position within
“YES” in S14), in other words, the right drive control signal CDRVR
Waiting position signal / CISR within 1 second after setting to “1”
Becomes "0", the CPU 1 determines that the cutter has moved normally. After this, the processing after step S21 is performed. On the other hand, when the cutter arrives at the left standby position within one second from the start of driving the cutter in the left direction (step S2
4 is “YES”), in other words, the left drive control signal CDRVL is set to “
The left standby position signal / CISL becomes “
When the value becomes "0", the CPU 1 determines that the cutter has moved normally. Thereafter, the processing after step S11 is performed.

However, if the cutter does not reach any of the standby positions even one second after the start of driving of the cutter ("YES" in steps S13 and S23), in other words, the right drive control signal CDRVR Or left drive control signal CDRV
Any standby position signal within 1 second after L is set to “1”
If neither / CISL nor / CISR becomes “0”, the CPU 1 drives the cutter in the reverse direction (step S31). Then, one second after the start of the driving of the cutter in the reverse direction, the CPU 1 checks the state of the two standby position signals / CISL and / CISR (step S3).
(2, S33), if either one is “0” (“NO” in step S33), an error (error 1) occurs that the cutter cannot move from one standby position to the other standby position. Is displayed on the display unit 11
(Step S34). Also, if one of the standby position signals / CISL, / CISR remains "1" even after one second has elapsed ("YES" in step S33 and "YES" in step S32),
The CPU 1 considers that an error (error 1) has occurred such that the cutter is stuck in the middle of both standby positions, and displays the fact on the display unit 11 (step S35).

Under the control of the CPU 1 as described above, the facsimile apparatus of the present invention has two types of errors, that is, an error that can only move between one standby position and an intermediate position between the two standby positions, and a cutter that has both errors. Since it is possible to distinguish from an error that does not move at all in the middle of the standby position, the recovery work by the user or the service person becomes easy.

In the facsimile apparatus of the present invention, under the control of the CPU 1 as described above, the cutter control unit 40 actually drives the DC motor 53 to move the cutter, and performs the braking control. 1 is reduced. Hereinafter, the control circuit 41 will be specifically described. FIG.
3 is a circuit diagram showing a circuit configuration example of a control circuit 41. FIG.

The detection signal / CUTL of the left sensor SL is provided by a waveform shaping circuit composed of a resistor and a capacitor and an inverter 411.
And is input to one input terminal of the AND gate 421 via. Further, the detection signal / CUTR of the right sensor SR is input to one input terminal of an AND gate 422 via a waveform shaping circuit composed of a resistor and a capacitor and an inverter 412. The left drive control signal CDRVL output from the CPU 1 is input to the other input terminal of the AND gate 421, and the output signal BLL is input to one input terminal of the OR gate 431. The right drive control signal CDRVR output from the CPU 1 is input to the other input terminal of the AND gate 422, and the output signal BLR is input to the other input terminal of the OR gate 431. The output signal CLK of the OR gate 431 is input to the clock input terminal CK of the D-flip-flop 450.

The left drive control signal CDRVL and the right drive control signal CDRVR, which are output signals from the CPU 1, are AND gates 421, 4
In addition to the signal 22, the signal is also input to both input terminals of the OR gate 432, and the output / CLR of the OR gate 432 is input to the negative logic clear terminal #CL of the flip-flop 450. A latch output Q which is a positive logic output signal of the flip-flop 450 is input to one input terminal of the OR gate 441 and one input terminal of the OR gate 442, respectively. In addition,
The left drive control signal CDRVL, which is an output signal from the CPU 1, is input to the other input terminal of the OR gate 441, and the right drive control signal CDRVR is input to the other input terminal of the OR gate 442, respectively. The output of the OR gate 441 is output to the motor drive circuit 42 as a right drive instruction signal CDR, and the output of the OR gate 442 is output to the motor drive circuit 42 as a left drive instruction signal CDL.

The output signal of the inverter 411 is again passed through the waveform shaping circuit composed of a resistor and a capacitor and the inverter 461 as a left standby position signal / CISL to the CPU 1.
The output signal of the inverter 412 is input to the CPU 1 again as a right standby position signal / CISR via a waveform shaping circuit composed of a resistor and a capacitor and the inverter 462 again. Therefore, the signal from the output from the inverter 411 to the input to the inverter 461 becomes the inverted signal CISL of the left standby position signal / CISL,
Is output from the inverter 462 to the inverter 462, and becomes an inverted signal CISR of the right standby position signal / CISR.

As described above, the output signals / CUTL and / CUTR of the two sensors SR and SL pass through the waveform shaping circuit twice, thereby reducing the influence of chattering due to the limit switches in the two sensors SR and SL. CPU as left standby position signal / CISL and right standby position signal / CISR
1 is input.

The D input terminal of the flip-flop 450 is supplied with the power supply potential Vcc, and the negative logic preset terminal #PR is also supplied with the power supply potential Vcc. Accordingly, the flip-flop 450 outputs the input signal to the clock input terminal CK (the OR gate 431) while the input signal to the negative logic clear terminal #CL (output signal / CLR of the OR gate 432) is “1”. When the output signal CLK) rises from "0" to "1", the level of the input signal to the D input terminal at that time is latched and output as a positive logic latch output Q. However, in this flip-flop 450, the input signal to the D input terminal is always at the power supply potential.
Since it is Vcc, the latch output Q always becomes "1" when the above-described latch operation is performed.

FIG. 8 is a timing chart for explaining the operation of the control circuit 41 configured as described above. Assuming that the cutter is in the standby state at the left standby position at the initial timing T0, the detection signal / CUTL of the left sensor SL shown in FIG.
The inversion signal CISL by 411 is “1”, and the detection signal / CUTR of the right sensor SR shown in FIG.
Is "1" and the inverted signal CISR by the inverter 412 is
Are respectively "0". Further, since the instruction to drive the cutter is not issued from the CPU 1, the left drive control signal CDRVL shown in (c) and the right drive control signal CDRVR shown in (d) are both "0". is there.

In the case described above, both drive control signals CDRVL,
Since both CDRVR are "0", the output signals BLL and BLR of both AND gates 421 and 422 shown in (h) and (i) are both "0". Therefore, as shown in (j)
The output signal CLK of the OR gate 431 is "0", and the output signal / CLR of the OR gate 432 shown in (k) is also "1".
0 ”(significant).
Since 450 is maintained in the reset state, the positive logic latch output Q of the flip-flop 450 shown in (l) is also "
Therefore, since the inputs to both OR gates 441 and 442 shown in (m) and (n) are both "0", the left drive instruction signals CDL, Both the right drive instruction signals CDR become “0.” Therefore, the motor drive circuit 42 does not drive the DC motor 53. In other words,
The cutter is free, as shown in (e).

When it is necessary to drive the cutter to cut the sheet P at timing T1 from such a state, the CPU 1 displays (d) because the current standby position of the cutter is left. The right drive control signal CDRVR for instructing the drive in the right direction is set to "1", and the left drive control signal CDRVL shown in (c) is maintained at "0". As a result, the output signal / CLR of the OR gate 432 shown in (k) changes to “1” (insignificant) and the flip-flop
Although the reset state of 450 is released, the output signal CLK of the OR gate 431 shown in (j) maintains "0" as it is, so that the flip-flop 450 latches the input "1" to the D input terminal. And the positive logic latch output Q maintains "0". Also, the right drive instruction signal CDR which is the output signal of the OR gate 442 shown in (n) is “H”.
However, since the left drive instruction signal CDL, which is the output signal of the OR gate 441 shown in (m), maintains “L”,
The DC motor 53 is driven to rotate forward, and the cutter starts moving rightward from the left standby position as shown in (e). That is,
The cutter makes a software start to the right.

As described above, after a while the cutter starts moving from the left standby position to the right, the leaf spring SLS of the left sensor SL separates from the cutter head 52 and the limit switch inside the left sensor SL is turned off. The detection signal / CUTL of the left sensor SL shown in (a) changes from “0” to “1”. As shown in the figure, the detection signal / CUTL of the left sensor SL generates an impulse several times due to chattering of the limit switch, and the detection signal / CUTL of the left sensor SL is inputted to the AND gate 421. Since the left drive control signal CDRVL, which is the other input signal, is maintained at "0", there is no effect on the other.

At a timing T2 within a maximum of 800 milliseconds from the timing T1 at which the cutter starts to move, the cutter head 52 contacts the leaf spring SRS of the right sensor SR, and the limit switch inside the right sensor SR is first turned on. in this case,
As shown in (b), the detection signal / CUT of the right sensor SR
R generates an impulse several times due to chattering of the limit switch. However, at the time T2 when the cutter head 52 reaches the right standby position and first turns on the limit switch inside the right sensor SR, the output signal BLR of the AND gate 422 shown in (i) becomes "1". (This signal BLR is also affected by chattering.) Therefore, the output signal CLK of this OR gate 431 (this signal CLK
Is also "1", which is input to the clock input terminal CK of the flip-flop 450. The input signal / CLR to the clear terminal #CL of the flip-flop 450 is already “1” at the timing T1 as described above.
(Meaningless). For this reason, the flip-flop 450 latches the input signal "1" to the D input terminal at the timing when the output signal CLK of the OR gate 431 rises from "0" to "1". The latch output Q also changes to "1".

Although the output signal CLK of the OR gate 431 shown in (j) is affected by the chattering of the limit switch, the input signal to the D input terminal of the flip-flop 450 is always "1". Therefore, until the flip-flop 450 is next cleared, in other words, the next significant ("0") signal is applied to the clear terminal #CL of the flip-flop 450.
Until the signal / CLR is input, the latch output Q maintains “1”.

The latch output Q of the flip-flop 450 is
Since the signal is input to the OR gates 441 and 442, the latch output Q of the flip-flop 450 becomes "1" as described above.
, The two OR gates 44 shown in (m) and (n)
The output signals of 1,442 both become "1". That is, the fact that both the left drive instruction signal CDL and the right drive instruction signal CDR become "1" means that the DC motor 53, in other words, the cutter is subjected to hardware braking. This hardware-based braking is applied to the cutter, and after the detection signal / CUTR chattering of the right sensor SR shown in (a) converges, the CPU 1 changes the right drive control signal CDRVR to “
The left drive control signal CDRVL shown in (d) is also set to "1" while maintaining it at "1". In this way, both drive control signals CDRVL and CDRVR both become "1", so that both ORs are set. Both the left driving instruction signal CDL and the right driving instruction signal CDR, which are the output signals of the gates 441 and 442, become "1", which means that the cutter has been braked by software.

Then, at a timing T3 within a maximum of 50 milliseconds from the timing T2, the CPU 1 sends the two drive control signals CDRV
L and CDRVR are both set to “0”. This gives (h) and
The output signal BL of both AND gates 421 and 422 shown in (i)
Both L and BLR turn to "0". Both drive control signals CDRVL, C
Since the output signal / CLR of the OR gate 432 becomes "0" when both DRVR become "0", the flip-flop 450 is cleared. At the same time, both output signals BLL and BLR of the AND gates 421 and 422 change to “0”, so that the output signal CLK of the OR gate 431 also changes to “0”. Therefore, the positive logic latch output Q of the flip-flop 450 is at the timing T
At step 3, the signal changes to "0" and the state is maintained until the output signal CLK of the OR gate 431 becomes "1".
As described above, since both the left drive instruction signal CDL and the right drive instruction signal CDR, which are the output signals of both OR gates 441 and 442, become "0", the DC motor 53, in other words, the cutter enters the free state.

The above description is for the case where the cutter moves rightward when the cutter is at the left standby position, but basically operates similarly in the opposite case.

The CPU 1 supplies the detection signals / CUTL and / CUTR of the two sensors SL and SR to the left standby position signal / CISL and the right standby position signal / CISR in which the influence of chattering is reduced by a two-stage waveform shaping circuit. Is entered.

As described above, in the circuit of the present invention, when the cutter starts moving from one standby position and reaches the other standby position, it is not controlled by the CPU but controlled by the hardware of the circuit itself. The operation causes braking of the cutter. For this reason, the cutter can be reliably stopped without putting a software load on the CPU, and when an error occurs during the movement of the cutter, it is possible to reliably detect the error.

[0051]

As described in detail above, according to the cutter control circuit of the present invention, the movement to one side is instructed in response to the movement instruction to the outside, that is, in this case from the CPU of the facsimile apparatus. And the signal indicating that the arrival of one of the cutters at a predetermined position has been detected, a signal indicating movement to the other is generated in hardware, and braking is applied to the cutter. Is reduced, and it is possible to concentrate on the original control of the facsimile machine.

Further, according to the facsimile apparatus of the present invention as described above, even if the arrival of the cutter at one of the predetermined positions is not detected even after the elapse of a predetermined time from the time when the instruction to move to one of the cutters is given, the other Is instructed, and the occurrence of different types of abnormalities is determined depending on whether or not the arrival of the cutter at the other predetermined position is detected by the elapse of the predetermined time thereafter. Recovery work becomes easier.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating the configuration and operation of a rotary cutter type cutter unit to be controlled by a cutter control circuit according to the present invention.

FIG. 2 is a functional block diagram showing a configuration example of a facsimile apparatus of the present invention in which a cutter control circuit of the present invention is incorporated.

FIG. 3 is a block diagram illustrating a connection relationship among a CPU, a cutter control unit, and a cutter unit of the facsimile apparatus of the present invention.

FIG. 4 shows a cutter controller and a CP of the facsimile apparatus of the present invention.
FIG. 9 is a list showing a relationship between each signal input / output to / from U and a state of a cutter indicated by the signal or control instructed by the signal.

FIG. 5 is a first half of a flowchart showing a procedure of an operation of the facsimile apparatus of the present invention.

FIG. 6 is a latter half of a flowchart showing a procedure of an operation of the facsimile apparatus of the present invention.

FIG. 7 is a circuit diagram illustrating a circuit configuration example of a cutter control circuit according to the present invention.

FIG. 8 is a timing chart for explaining the operation of the cutter control circuit of the present invention.

[Explanation of symbols]

1 CPU, 40 cutter control unit, 50 cutter unit, 42 motor drive circuit, 51 fixed blade, 52 cutter head, 53 DC motor, 54 screw rod, 55 rotary blade, SL left sensor, SR right sensor.

Claims (3)

[Claims] 1. A cutter control circuit that applies braking to a cutter when both signals instructing movement in both directions are given, and instructs movement to one in response to an external movement instruction given from the outside. A cutter control circuit comprising means for applying a brake to the cutter by generating a signal indicating movement to the other from a signal and a signal indicating that the arrival of the cutter at one predetermined position is detected. . 2. A method for instructing movement of a cutter for cutting a recording sheet to another one when the arrival of the cutter at one of the predetermined positions is not detected even after a lapse of a predetermined time from a point in time when the cutter is instructed to move to one of the cutters. A facsimile apparatus configured to determine that an abnormality has occurred when the arrival of the cutter at the other predetermined position is detected by a predetermined time thereafter. 3. Even after a lapse of a predetermined time from the point in time when the cutter for cutting the recording paper is instructed to move to one side, if the arrival of the cutter to the one predetermined position is not detected, the movement to the other is instructed. A facsimile apparatus for determining that an abnormality has occurred when the arrival of the cutter at the other predetermined position is not detected even after a predetermined time has elapsed thereafter.