JPS6141330Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a facsimile receiver, and particularly to an abnormality detection device in a recording paper conveyance system.

Conventional abnormality detection devices in facsimile receivers include, for example, installing a detector that detects the recording paper in the middle of the recording paper conveyance system, and detecting an abnormality by comparing the time it takes for the recording paper to pass through the detector. . However, as facsimile receivers become faster, a variable sub-scanning system is adopted for feeding the recording paper, and the advancing speed of the recording paper is not constant, making it impossible to detect abnormalities with the above means.

Therefore, an encoder that rotates as the recording paper moves and a detector that detects the rotation of this encoder are installed, and the number of pulses detected by this detector and the number of step pulses applied to the pulse motor that drives the recording paper are calculated. An abnormality detection device that detects abnormalities by comparison has also been proposed. However, this abnormality detection device can only detect an abnormality in paper feeding at the detection section, so even if a problem such as a paper jam occurs immediately ahead, the abnormality will not be detected if the paper feeding at the detection section is normal. There is.

The purpose of the present invention is to eliminate these drawbacks and provide an abnormality detection device that reliably detects abnormalities in the recording paper conveyance system until the recording paper is ejected to the stacker. Recording paper, a drive roller for controlling the advance of the recording paper, a recording head for recording on the recording paper, and a cutter for cutting the recording paper recorded by the recording head each time reception is completed.
an ejection roller for ejecting cut recording paper;
A facsimile receiver having a pulse motor for rotating the drive roller, further comprising a detector for detecting the presence of recording paper between the cutter and the ejection roller, and the number of step pulses applied to the pulse motor. The recording paper cut by the cutter is ejected by the ejection roller at a higher speed than the advancing speed during recording, and the counter starts counting in response to a reception start signal, and the drive roller starts recording. If the detector does not detect the recording paper when a preset number of pulses sufficient to move the paper from the recording head position to the detector position is reached, a first abnormality detection signal is generated. , the timer circuit starts operating at the cutting timing of the cutter when the detector is detecting the recording paper, and sets a preset time sufficient for the ejection roller to drive the recording paper to pass the position of the detector. The abnormality detection device of the facsimile receiver is configured to generate a second abnormality detection signal if the detector detects the recording paper after the elapse of time. Examples will be described below with reference to the drawings.

FIG. 1 is a block diagram of the first embodiment of the present invention, in which 1 is a roll of recording paper (hereinafter referred to as recording paper), 2 is a guide roller, 3 is a recording head, and 4 is a drive roller, which is a pulse for driving the recording paper. Driven by a motor (not shown). A cutter 5 is provided at a position _L2 from the recording position 3a. Reference numeral 6 denotes a detector for detecting recording paper, such as a micro switch, which is provided at a position _L1 from the recording position 3a, and outputs 1 when no recording paper is detected, and outputs 0 when recording paper is detected. 7 is a discharge roller driven by a discharge motor (not shown). 8 is a pinch roller, 9
is Stadka.

FIG. 2 shows an example of the circuit configuration of the same embodiment, in which 21 is a pulse motor drive circuit for driving the recording paper, 22 is an inverting circuit, 23 is an AND circuit, 24 is a counter circuit for counting step pulses of the pulse motor, 25
is a comparison circuit that outputs 1 when the counter value matches a predetermined number N ₁ , 26 is an AND circuit, and 27 is a comparison circuit that outputs 1 when the counter value matches the predetermined number N ₂ after reception is completed. 28 is a cutter drive circuit, 29 is a flip-flop, and 30 is a timer circuit that operates while the flip-flop 29 is outputting 1 and outputs an output after a predetermined period of time.

The operation in such a configuration will be explained. FIG. 3 is a timing chart of this operation, and each signal a to g in FIG. 2 corresponds to a to g in FIG. 3, respectively.
corresponds to For example, when reception of the first sheet is started, the recording paper 1 is recorded by the recording head 3 and sent out by the drive roller 4. At this time, the counter circuit 24 starts counting the number of step pulses of the pulse motor that drives the drive roller 4, and the comparator circuit 24 starts counting the number of step pulses of the pulse motor that drives the drive roller 4.
When the number _N1 set to 5 is counted, the output of the comparator circuit 25 becomes 1, which passes through the NOT circuit 22, and the output of the AND circuit 23 becomes 0, and counting is stopped. Thereafter, the recording paper 1 is sent out one after another by the drive roller 4, and when the reception of the first paper is completed, the counter circuit 2
4 is cleared by a clear pulse. Next, in the case of continuous reception in which reception of the second sheet starts, the counter circuit 24 starts counting the number of step pulses of the pulse motor in receiving the second sheet, and counts _N2 set in the comparison circuit 27. Then, the comparator circuit 27 generates an output 1, and the cutter drive circuit 2
8 operates, the circuit blade 5a of the cutter 5 rotates once,
While cutting the recording paper 1, the flip-flop 29
The output becomes 1, and the timer circuit 30 starts operating. Further, the cut recording paper 1 is discharged to the stacker 9 by a discharge roller 7 driven by a discharge motor at a speed that is always faster than the traveling speed during recording.
The purpose of transporting the cut recording paper 1 at high speed is to create a gap (third This is to provide a signal (as shown in the figure e signal). The counter circuit 24 then continues counting up to _N1 and then stops. After receiving the second image, if you want to immediately start receiving the next image, repeat the above operation, but if the signal to start receiving does not come after the reception of the second image has finished, the pulse motor will stop at N ₂ . The recording paper 1 is sent out by pulse drive, and the recording paper 1 that has been received is cut by the cutter 5 and placed in the stacker 9.
After being ejected, the leading edge of the recording paper 1 is returned to the recording position 3a. Here, if the amount of movement of the recording paper 1 by one step pulse of the pulse motor is P, and N ₁ and N ₂ are determined in the relationship L ₁ ≦N ₁ ×P L ₂ =N ₂ ×P, then the recording paper 1 is normal. If the recording paper 1 is being conveyed, the detector 6 detects the leading edge of the recording paper 1 and the output becomes 0 before the output of the comparison circuit 25 becomes 1, and the output of the AND circuit 26 becomes 0.
Further, as the rear end of the cut recording paper 1 passes through the detector, the output of the flip-flop 29 becomes 0 and the timer circuit 30 stops operating.

However, the recording paper 1 may become jammed in the recording paper conveyance system (hereinafter referred to as the recording feeding system) up to the detector 6, the drive roller 4 may not rotate, or even if it rotates, it may slip. 1 is not conveyed normally, the detector 6 will be delayed in detecting the leading edge of the recording paper 1, and when the counter circuit 24 counts up to N ₁ , if the detector 6 does not detect the recording paper 1, This is the first abnormal operation shown in FIG. When this first abnormal operation occurs, the output of the AND circuit 26 becomes 1 and an abnormality detection signal 1 is generated. In addition, the trailing edge of the cut recording paper 1 may not pass through the detector 6 due to poor cutting of the cutter 5 or paper jamming in the recording paper conveyance system (hereinafter referred to as the ejection system) after the detector.
When the second abnormal operation shown in Fig. 3 occurs, the timer circuit 3
0 continues to operate, and when the ejection roller 7 drives the recording paper 1 for a preset time sufficient to pass the position of the detector 6, the detector 6 detects the recording paper 1.
If detected, output is generated. This output is designated as abnormality detection signal 2. The abnormality detection signal 1
Alternatively, when the abnormality detection signal 2 is generated, warning lights (not shown) are turned on to notify the facsimile transmitter of the abnormality, and the facsimile receiver stops operating.

In the first embodiment, a microswitch is used as the detector, but a detector composed of a light emitting element and a light detecting element may also be used. Also,
In the first embodiment, separate warning lights are turned on for the abnormality detection signal 1 and the abnormality detection signal 2, but the number of warning lights may be reduced to one using an OR circuit.

This invention has a detector between the cutter and the ejection roller, and is configured to detect abnormalities at the leading edge and the cut trailing edge of the recording paper. System abnormalities, etc. 1
The system is configured so that the recording paper is detected by two detectors and then cut by a cutter and then discharged by a discharge roller at a speed faster than the advancing speed during recording. However, by detecting the above-mentioned abnormalities at the leading and trailing edges of each received record, it is possible to quickly and reliably detect abnormalities related to the recording paper transport system, making it an excellent abnormality detection device for facsimile receivers. It has the following.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram of the embodiment of FIG. 1, and FIG. 3 is an operation timing chart of the embodiment of FIG. 1...Rolled recording paper, 3...Recording head, 4
...Drive roller, 5...Cut, 6...Detector,
7... Discharge roller, 9... Stacker, 21... Pulse motor drive circuit, 24... Counter circuit, 2
5... Comparison circuit, 27... Comparison circuit, 30... Timer circuit.

Claims (1)

[Scope of utility model registration request] A roll of recording paper, a drive roller that controls the advancement of the recording paper, a recording head for recording on the recording paper, a cutter that cuts the recording paper recorded by the recording head every time reception is completed, and a cutting device. In a facsimile receiver having a discharge roller for discharging recorded paper and a pulse motor for rotating the drive roller, a detector is provided between the cutter and the discharge roller to detect the presence of the recording paper. In addition, a counter and a timer circuit are provided for calculating the number of step pulses applied to the pulse motor, and the recording paper cut by the cutter is ejected by the ejection roller at a higher speed than the advancing speed during recording, and the counter is also provided. starts counting by the reception start signal, and when the drive roller reaches a preset number of pulses sufficient to move the recording paper from the recording head position to the detector position, the detector detects the recording paper. If not, a first abnormality detection signal is generated, and the timer circuit starts operating at the cutting timing of the cutter when the detector is detecting the recording paper, and the discharge roller drives the recording paper to trigger the detection of the detector. A facsimile receiver characterized in that the facsimile receiver is configured to generate a second abnormality detection signal if the detector detects the recording paper after a preset time sufficient for the recording paper to pass through the position. Anomaly detection device.