JPS58220152A - Method and device for controlling roll paper feed of copying machine - Google Patents

Abstract

PURPOSE:To obtain sheets of copying paper exactly cut each by an exact length, by controlling feed time of the roll of the paper to a value obtd. by multiplying the ratio of the paper feed speed to an original feed speed by the original feed time. CONSTITUTION:When the original 2 is detected with an original photodetector 3, 3b, its output signal DS is fed to CPU23 and it opens an AND gate 24, and a pulse signal PP issued from a pulse generator 20 is applied to a counter 21 to start count. On the other hand, CPU23 generates paper feed signal PS a prescribed time after the rise time of the signal DS. The signal PS enters a roll paper feeder 7 to start paper feed, and opens an AND gate 25 for a counter 22 to count the signal PP. When the end of the original 2 is detected with the detector 3, the counter 21 stops counting. This count value is fed to CPU23, multiplied by the ratio of the roll paper feed speed to the original feed speed, and when the count of the counter 22 becomes equal to that value, the roll paper is cut 8 with a drive signal Sc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll paper feed control method and apparatus for a copying machine that can take a copy of a length corresponding to the size of the original from a scale-sized original.

In general, a copying machine using 1-"-le paper is shown in FIG.
) LL '(IL, +71 NOW, URA Document conveyance device 1 is fed, t,: The document 1 is fed.)
J:C is optically detected by the original detecting device 3 consisting of a light-receiving cable T31) and sent to the original illuminating device 4. The original sent to the original illuminating device 4 is exposed at an exposure point 4a of the original illuminating device 4, and an image is formed on a point 5a of the photosensitive drum 51.

On the other hand, the 1-ru paper wound in an 1'-ru shape is sent out by the 11-ru paper feeding device 7, and is passed through the cutter 8 into the paper Ilr! Transfer is performed by the photosensitive drum 5 guided by the feeding device 9 and on which the image is formed.

The conventional call paper feed control device for this J-shaped copying machine, which can feed sheets of any length to accommodate originals of various sizes, is as shown in Figure 2. There is. In this device, an output No. 15 DS of a light receiving element 31) of a first document detecting device 3 which detects a document 2 fed to the horizontal 1 of the original mWI feeder is sent to an exclusive OR circuit 10 as a signal 8DS. is also added to the exclusive OR circuit 11 via the non-inverting input and the inverting input of the timer circuit 11. 7
and controls the cutter 8. That is, if the output signal 1) S of the light receiving element 3b is as shown in FIG. s'r -l
A pulse 47:-QTS having a pulse width corresponding to the delay time of the timer circuit 11 is output, which is 1°' at the rising and falling portions.

The output signal TS of the tine circuit 11 shown in FIG. 3(b)
is not shown in FIG.
The signal CS from the circuit 10 is shown in FIG. 3(C).
h'tf? It will be done. This signal cs has the same pulse width as the signal 1) S, and is a signal obtained by delaying the signal 1) S by the delay time of the timer circuit 11. The roll paper feeding device 7 is driven by the signals c and s, and the force lever 8 is driven by the signal C3 (see FIG. 3 (1)) generated at the falling edge of the signal PS. The rolled paper feeding device 7 is driven for a time corresponding to the original detection time by the device 3, and roll paper having the same length as the original is obtained.

By the way, the above-mentioned device has a conveyance speed V of the document conveyance device 1.
I) It is assumed that the paper feed speed 01 of the roll paper handling device is equal, and if the above transport speed VI) and the paper feed speed vP are different, it is equal to the document length - ~
Sane “I couldn’t get the C form.

In other words, the paper cut by the above device has an error corresponding to the ratio of the transport speed VD and the paper feed speed VP, and this error becomes larger as the document becomes longer.

This invention is above)! l! This was done in consideration of the above issues, and when the transport speed of the document transport device and the paper feed speed of the roll paper feeder (roll paper feeder F!V) are different (-), the length of the original It is an object of the present invention to provide a roll paper feeding method and apparatus for a copying machine which enables accurately cut paper to be obtained.

In other words, the length of the document is 1-1) the conveyance speed of the document is V
I) /Jtsu(~ and the length of the paper being fed is 1.-
If the paper feeding speed is VP, the time TD during which the document is detected by the document repelling device is T D = 1. , D/VD
...(1), and the paper feeding time TP of the roll paper to obtain the above paper is "T' P = IP, ,/V l)
...(2). Here, LD=LP, but if we insert the 1st condition in equations (1) and (2), then T
P='TD-(DV/Vl)) (31).

In this invention, by controlling the paper feeding time of the low-heel paper using the above equation (3), the m-feeding speed mark VD of the original and the paper feeding speed VP of the 1-1-l paper are different. /,,=
This makes it possible to obtain a sheet of paper exactly equal to the length of the original even when the length of the document is LD.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 4 is a block diagram showing one embodiment of the present invention.

Note that the circuit of this embodiment is based on the second circuit based on the device shown in FIG.
Paired with the circuit shown in the figure 1. 8 of the circuit in Figure 4; (For details, please refer to Figure 1 and use the same function as the circuit in Figure 2.
= Use the same bow. This example is a pulsed type 2
Two counters 21 and 22 driven by a pulse signal PP of a predetermined period generated from 0 are used to form a paper feed signal PS that controls the paper feed time and cutter movement rate. .

When the original 2 is detected by the original detecting device 33, the output of the light receiving element 31) of the original detecting device 3 is sent as a base signal 1) S to the central processing tool F? (CI]tJ) 23
In addition to 1, it is added to Antogame].24, and the AND gate 24 is opened. As a result, the pulse signal PP generated from the pulse generator 20 is
4 to the J counter 21, and the counter 21 starts the 31 number operation of the pulse signal PP. Also C Pj
J23 activates an internal timer based on the signal DS, and releases the paper feed signal PS output from the CPU 23 after a predetermined time. This paper feed signal PS is applied to the roll paper feeder 7 and causes the roll paper feeder 7 to start feeding the roll paper. Also, the paper feed signal PS is output from the AND gate 25.
, opens the AND gate 25, and opens the pulse generator 2.
An output pulse signal PP of 0 is applied to the counter 22 to start the 81 number operation of the counter 22.

When the document 2 is conveyed by the document conveyance device 1, the end of the document 2 is detected by the document detection device 3.
S falls, AND gate 24 closes and counter 2
Stop the g11 number movement of 1. At the same time, the 31 number V (V) 1 of the counter 21 at this time is taken into the CPU 23, and the "L-paper feeding speed ffl" is preset to this count D1.
The ratio VD/VP of the document transport speed VD to VP is multiplied by the value D2 corresponding to λ・1 to obtain the value D I X I) 2
A computation is performed to obtain .

Here, the value D2 is the voltage predetermined by the variable resistor 26 and converted to a digital value by the digital converter 27''i''i''i''.

CPU 23 Idiot') >'l 2217) f
fl numerical value]) 33 Compare the above value D I 'X D 2, S1 numerical value D3 is value 1] 1 x D2 to 3! Then, the paper feed signal PS falls, and the roll paper handling device j? Avoid stopping the paper feeding operation of ff7. Further, when the signal PS falls, the AND GO 1-25 is closed, and the old 1-number operation of the counter 22 is stopped.

Further, the CPU 23 drives the J vine 8 to cut the roll paper in synchronization with the fall of the paper feed signal PS (drives the cutter 8 (generates No. 3 C8, thereby).

Incidentally, the H1 count of the counters 21 and 22 is reset to 1 by the next supply of the document 2.

In this way, the paper feeding operation (paper feeding time) by the roll paper handling device 7 is determined according to the paper feeding speed VP of the roll paper at the document detection time (δ1 value DI of the counter 21) at the document detection device W4. Since the conveying speed VD ratio VD/'V l) is controlled to 11 points IJ, the original 2
It is possible to obtain sheets of paper that exactly match the length of the paper.

Although the embodiment described in L is constructed using CP LJ 23, the same construction can be made by combining a multiplier, a comparator, etc. in place of this CI]jJ.

As described above, according to the present invention, it is possible to feed paper that has been cut in accordance with the document length b, even when the transport speed of the document and the paper feed speed of the rolls are different. Further, by adjusting the speed ratio, it is possible to eliminate errors in paper cutting due to variations in mechanical parts.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the general configuration of a copying machine using [1-leaf paper], Fig. 2 is a block diagram showing a conventional device, and Fig. 3 is a
FIG. 4 is a timing chart for explaining the circuit shown in the figure, and FIG. 4 is a diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Document conveyance device, 2... Document, 3... Document detection device, 4... Document detection device, 5... Photosensitive drum,
6...11-roll paper, 7... Roll paper handling device, E3
...Cutter, 9...Paper transport device, 10...Exclusive 17 circuit, 11...Timer circuit, 20...Pulse generator, 21..., 22...Counter, 23...・C
PU, 24.25...) 7nd gear, 26... Variable resistor, 27...j7 [1 gu'' digital converter. Figure 1 Figure 2 Figure 3 Figure 4 Figure 4 h

Claims (2)

[Claims] (1) Copying machine roll paper that controls the roll paper feeding time of the roll paper feeder based on the transport time of the original transported by the original transporter so that one paper of the length corresponding to the original is loaded. In the paper feed control method, the above-mentioned [l-le paper feed! ! I-Adventure Paper Feeding 3! The ratio of the conveying speed of the document conveying device to the rate (multiplying the conveyance time of the document by the value above) -
1- A roll paper feeding control method for a copying machine, characterized in that the roll paper feeding time is controlled. (2) Document transport device i''7, J, and 1-1- have a paper feeding device, and the paper feeding time is determined by the roll paper feeding device based on the document feeding time by the document feeding device. control,
A copying machine designed to obtain paper of a length corresponding to the original.
-1- A pulse generator that generates pulses of a constant period in the paper feed control device, and a document conveyance device that is disposed in the document conveyance path of the document+m conveyance unit and detects the conveyance of the document; A first counter that counts 91 pulses generated from the pulse generator while the original is being detected by the original detecting device, etc. synchronously emitted from the pulse generator/1
The counted pulses are counted, and the counted value is calculated as follows: [1- The document conveyance that overlaps with the paper feeding speed of the paper feeding device! The count value of the first counter is added to the ratio of the transport speed of 1iflff.
[a second counter which receives a sharpening stop signal that matches the value, and the roll paper feeding device feeds one coil of paper based on the stop signal generated from the second counter; 1. A roll paper feed control device for a copying machine, characterized in that a cutter for cutting the roll paper is activated while stopping the roll paper.