JPS6241009Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a control device for a cutting device that cuts a roll of recording paper, and is used in a paper conveyance device that cuts a roll of recording paper and performs development, fixing, etc. while conveying the cut paper. Regarding.

In conventional paper conveyance devices, a roll of recording paper may be cut to a length longer than a predetermined length due to malfunction of the cutting device.

Therefore, a sheet of paper cut to a length longer than a predetermined length may end up in the sheet conveying device with its front end reaching the developing device and its rear end reaching the recording device. Incidentally, in recent facsimile machines, recording is performed while conveying the paper at a variable speed. However, during development, if the paper is transported at a variable speed, uneven development occurs, so it is necessary to transport the paper at a constant speed. However, as described above, paper cut longer than a predetermined length may end up spanning the recording paper and the developing device, so the paper cut longer than the predetermined length may end up being developed at a variable speed in the recording device. As a result,
Uneven development may occur.

The present invention has been developed in view of the above-mentioned problems with the conventional technology. The present invention provides a control device for a recording paper cutting device.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a paper conveying device in an embodiment of the present invention, FIG. 2 is an enlarged view of a cutting device, FIG. 3 is a circuit diagram of a control device in an embodiment of the present invention, and FIG. The figure is a waveform diagram showing the operation of each part in FIG. 3.

First, explanation will be given with reference to FIGS. 1 and 2.

A roll of recording paper 1 is fed out at a variable speed in the direction of arrow X by a feeding roller 2, and is fed to a recording device 3.
A latent image is formed on the surface. after that,
The rolled recording paper 1 is transported by a transport roller 5, and when it has been transported a predetermined length, a cutting device 6 comprising a rotary blade 6a and a fixed blade 6b is operated and cut.

The cut roll-shaped recording paper 11 (hereinafter referred to as paper) is transported at a constant speed by a transport roller 5'. When the leading edge of the paper 11 reaches the detector 7, the detector 7 operates and detects that the paper 11 is present. This detector 7 is composed of a light emitting element 7a and a light receiving element 7b, and when a paper 11 is interposed between them, light from the light emitting element 7a is transmitted to the paper 1.
1 detects the presence of paper 11. The paper 11 is further conveyed at a constant speed, and is developed and fixed by a developing device 8 and a fixing device 9. Thereafter, the sheet is discharged to the stacker 12 by the sheet discharge roller 10. Rotary blade 6a
A drive device 4 that drives the rotating shaft of the cutting device 6 and the cutting device 6.
The rotation axis of (motor 4 in this example) is
The motor 4 is connected via a belt 14.
The rotational force is transmitted to the rotary blade 6a via the belt 14. Therefore, when the rotary blade 6a rotates once, the rolled recording paper 1 is cut at the contact point of the fixed blade 6b. Further, a shutter 13 attached to the rotating shaft of the rotary blade 6a is adapted to operate a detector 15 when the roll-shaped recording paper 1 is cut. Therefore, based on the detection signal from the detector 15, it is possible to confirm the operation of the cutting device 6, and also to know when the rolled recording paper 1 is being cut.

In this embodiment, a fully rotating cutter is used as the cutting device 6, but a reciprocating cutter or the like may be used. It is also possible to constantly rotate the motor 4, which directly utilizes the output of the motor 4, to drive the cutting device 6, and to operate the cutting device 6 via a switching device such as a clutch.

Next, a description will be given with reference to FIGS. 3 and 4.

First, the output Q ₁ of the up-down counter 19 ~
The initial value of _Q4 is set to "0". Thereafter, a cutter signal _a1 indicating that the cutting device 6 has operated is inputted to the up terminal of the up/down counter 19 via the input terminal 16. The up-down counter 19 receives this cutter signal _a1 as
When input, the contents of outputs _Q1 to _Q4 are set to "1". These outputs Q ₁ to _{Q 4} are obtained by converting the contents of the up-down counter 19 into binary numbers. For example, when the contents of the up-down counter 19 are "1",
In the case of , it becomes "0001", and in the case of "2", it becomes "0010". After that, when the leading edge of the paper 11 reaches the detector 7, the detector 7 operates, and the detection signal b is transmitted to the input terminal 1.
The signal is inputted to a differentiating circuit 18 and an AND circuit 21 via 7.

By the way, since the paper 11 is transported at a constant speed by the transport roller 5' as described above, the time from when the detector 7 detects the leading edge of the paper 11 to when it detects the trailing edge is _t1 to t. ₄ (this time t ₁ to _{t 4} is the detection signal b section outputted by the detector 7) are equally constant.

While the latest paper 11 is being transported by the transport roller 5', the rolled recording paper 1 is fed out again by the delivery roller 2, and is cut by the cutting device 6 after recording is completed. When the second cutter signal _a2 is input through the input terminal 16, the up-down counter 19 counts up the content to "2". At this time, the H level detection signal b is input to one input terminal of the AND circuit 21. Further, the contents of the outputs Q ₁ to _{Q 4} of the up-down counter 19 input to the 4-input OR circuit 20 are "0010", and the 4-input OR circuit 20 outputs an H level signal. However, this H level signal is inverted and becomes an L level signal immediately before being input to the AND circuit 21, so the AND circuit 21 does not output an H level signal. Thereafter, when the trailing edge of the first sheet 11 passes through the detector 7, the detection signal b becomes an L level signal. The differentiating circuit 18 outputs the signal c to the down terminal of the up/down counter 19 at the falling edge of the detection signal b. The up-down counter 19 outputs when this signal c is input.
Change the contents of Q ₁ to _{Q 4} from "2" to "1". The numerical value indicated by this content indicates how many sheets of paper 11 are present within a predetermined length l (distance from cutting device 6 to detector 7). Thereafter, the second sheet 11 is conveyed at a constant speed by the conveyance roller 5', developed and fixed by the developing device 8 and the fixing device 9, and then transferred to the stacker 12 by the sheet discharge roller 10.
The paper is ejected. This second sheet of paper 11 is the detector 7
(time t ₂ when the detection signal b is at H level), the third cutter signal a ₃ is input to the up-down counter 19. When the cutter signal _a3 is input, the up-down counter 19 changes the contents of the outputs Q1 to _Q4 from " ₁ " to "2". Thereafter, when the second sheet 11 passes through the detector 7, the differential circuit 18 outputs a signal c, and the contents of the outputs _Q1 to _Q4 of the up-down counter 19 change from "2" to "1".

Here, the operation of forcibly driving the cutting device 6 when the rolled recording paper 1 is not cut within a predetermined length l due to a malfunction of the cutting device 6 will be described.

The contents of the outputs Q ₁ to _{Q 4} of the up-down counter 19 become "0" when the third sheet 11 passes the detector 7. The contents of the outputs Q ₁ to _{Q 4} represent the number of sheets 11 existing between the cutting device 6 and the detector 7, as described above. Therefore,
The content of the outputs Q ₁ to _{Q 4} of the up-down counter 19 is “0”, which means that the outputs from the cutting device 6 to the detector 7
This means that the paper 11 does not exist until then. However, if the detection signal b from the detector 7 were to be input at this time, there would be a contradiction with the contents of the up-down counter 19. This discrepancy is due to a malfunction of the cutting device 6. When the up-down counter 19 has a value of "0" and the detection signal b from the detector 7 is input, the roll recording paper 1 remains uncut. , it has been extended to the detector 7. If left as is, the roll of recording paper 1 will not be cut one by one, so in such a case it is necessary to cut it at a predetermined length l.

When the contents of the outputs _Q1 to _Q4 of the up-down counter 19 are "0", the output of the 4-input OR circuit 20 becomes an L level signal, but it is inverted just before the input terminal of the AND circuit 21 and becomes an H level signal. Become. At this time, since the H level detection signal b is input to the other input terminal of the AND circuit 21, the AND circuit 21 outputs the H level signal to the differentiating circuit 22. The differentiating circuit 22 inputs the signal e to the motor 4 via the output terminal 23 at the rising edge of the signal from the AND circuit 21 . When this signal e is input, the motor 4 rotates the rotary blade 6a of the cutting device 6, and the rolled recording paper 1 is cut.

As described above, according to the present invention, even if the cutting device that cuts the roll of recording paper malfunctions, the cutting device is forced to operate, so the roll of recording paper can be cut at a predetermined length. be able to.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a paper conveying device in an embodiment of the present invention, FIG. 2 is an enlarged view of the same cutting device, and FIG. 3 is a block diagram showing the circuit configuration of a control device in an embodiment of the present invention. 4 are waveform diagrams showing the operation of each part in FIG. 3. 1...Rolled recording paper, 2...Feeding roller,
3... Recording device, 4... Motor, 5, 5'...
Conveyance roller, 6... Cutting device, 7... Detector, 8
...Developing device, 9...Fixing device, 10... Paper ejection roller, 11... Paper, 12... Stacker, 13
... Shutter, 14 ... Belt, 15 ... Detector, 16, 17 ... Input terminal, 18, 22 ... Differentiation circuit, 19 ... Up-down counter, 20 ...
...4-input OR circuit, 21...AND circuit, 23...
...Output terminal.

Claims (1)

[Scope of utility model registration request] a cutting device for cutting a roll of recording paper; a first detector for detecting that the cutting device has cut the roll of recording paper; a second detector that detects the roll of recording paper cut by the cutting device; a detection signal from the first detector and a detection signal from the second detector are input; an up-down counter that outputs a signal indicating the number of sheets of the cut roll-shaped recording paper existing up to the second detector, and when the output of the up-down counter is "0" and the When the detection signal from the second detector is received, it is determined that the rolled recording paper has not been cut within a predetermined length, and a signal is output to force the cutting device to operate. A control device for a roll recording paper cutting device, characterized in that: