JPS60157453A - Automatic paper feeder for ziazo copier - Google Patents

Abstract

PURPOSE:To match the cutting length of photosensitive paper continuously with the length of document by interlocking the selection switch of delay timer for varying the delay time with the function of means for switching the carry speed. CONSTITUTION:Upon start of paper feed through insertion of document, a document trailing edge detector 4 is enabled to detect passing of the trailing edge of document 1 through said detector 4. Consequently, the trailing edge detection signal holding circuit 31 will rise to set CR oscillation timer 32 thus to provide delay time of CR oscillation timer 32 matched with the carrying speed through the resistance preset by the selection switch interlocked with selection of carrying speed. Upon elapse of said delay time, a cutter drive control circuit 30 will function to start rotation of rotary cutter with predetermined time lag, to reset said circuit 31 and timer 32. When increasing the number of selection switches, the delay time can be set finely against the variation of carrying speed resulting in fine matching between the cutting length of photosensitive paper and the length of document.

Description

Detailed Description of the Invention Technical Field The present invention relates to an automatic sheet feeder for a diazo copying machine that uses a roll of photosensitive paper and automatically cuts the paper into a length according to the original size and feeds the paper. Regarding equipment.

Prior Art Diazo copying machines that copy originals of various sizes use roll photosensitive paper, which is automatically cut into sheets of length according to the size of the original to be copied and fed. An automatic sheet feeding device is often used that transports the paper to a printing unit, where the leading edge of the original is aligned with the original.

The schematic structure of an example of this type of diazo copying machine will be explained with reference to FIG. This copying machine includes a document feeding section 100, a photosensitive paper feeding section 200, and a copying section 300.

The document feeder 100 includes a document trailing edge detector 4, a feed roller, and a document leading edge detector 2 along the document conveying path following the document insertion slot.
are arranged in this order. The photosensitive paper feeding section 200 includes
A roll of photosensitive paper 3 is mounted as photosensitive paper, and a paper feed roller, a rotary cutter 5, and a paper feed roller are arranged in this order along the conveyance path of the photosensitive paper pulled out from the roll.

When the original 1 is inserted from the original insertion slot, the original is fed by the paper feed roller, the leading edge of the original is detected by the original leading edge detector 2, and the leading edge of the original is detected by the leading edge detector 2. Based on the detection signal, the original is pulled out from the roll photosensitive paper 3 and sent to the paper feed path. A photosensitive paper whose leading edge is at a predetermined position is fed by a paper feed roller, and the leading edge of the photosensitive paper matches the leading edge of the document 1 and is carried into the copying section 300 . When the trailing edge of the original 1 is detected by the trailing edge detector 4, the rotary cutter 5 starts rotating and cuts the roll of photosensitive paper, and when the rotary cutter 5 rotates once and returns to its original position, the roll of photosensitive paper is cut off. The paper also stops. The position of the document trailing edge detector 4 is arranged in relation to the position of the rotary cutter 5 so that the length of the photosensitive paper thus cut matches the length of the document. Further, the distance from the leading edge of the photosensitive paper, which is pulled out from the roll paper after being cut and stopped, to the merging point with the original, and the distance from the original leading edge detector 2 to the merging point are made equal.

The superimposed original and the cut photosensitive paper are in the copying section 30.
The photosensitive paper is conveyed while being held between the printer glass 6 in the printer 0 and the conveying belt 7, during which printing is performed on the photosensitive paper by the printing lamp 8. The stacked body that has completed the printing process is separated by, for example, suction type separation devices 9 and 10, the original 1 is ejected to the document receiver 11, the photosensitive paper is sent to the developing device 12 where it is developed, and then passed through the ejection roller 13. It is discharged to the copy receiver 14.

When making multiple copies from the same original θ゛i, the desired number of copies is input in advance into a repeat counter (not shown), and the separated original 1 is guided to the repeat tank 16 by the switching claw 15. The leading edge of the document is detected by the repeat section document leading edge detector 17, and the detection signal causes the sheet roll photosensitive paper to be fed. When the trailing edge of the document passes through the trailing edge detector 18 in the repeater 1 to tank 16, the rotary cutter is activated, and the photosensitive paper is cut to the same length as the original. By repeating this process for the desired number of copies, the desired number of copies can be automatically obtained. repeat section original leading edge detector 17;
The relationship between the position of the repeat unit document trailing edge detector 18, the leading edge position of the stopped photosensitive paper, and the position of the rotary cutter 5 is the same as that of the document feed unit lOO.

Now, with diazo copying machines, depending on the transmittance of the manuscript paper,
It is necessary to change the transport speed inside the machine. Original paper feed section 1OO1
Conveyance speed of photoconductor paper feeding section 200, rotary cutter 5
The rotational speed of is also changed to match this speed. However, there is a slight time lag between the time when the document trailing edge detection signal from the document trailing edge detector 4.18 is input to the drive control device of the rotary cutter 5 and the time when the lff-gree cutter starts operating. I can't do it. This time lag is always constant regardless of the conveyance speed. Therefore, when the conveyance speed is high, the length of the photosensitive paper conveyed during the time lag is longer than when the conveyance speed is low.9 As shown in FIG. 2, as the sheet conveyance speed increases,
Since the amount of deviation between the sheet cutting dimension and the document dimension increases (-sheet cutting dimension - document dimension), the operator has to manually adjust the position of the document trailing edge detector every time the conveyance speed is changed, which is a tedious task. was forced to do so.

Purpose The present invention solves the above-mentioned drawbacks of the conventional automatic sheet feeding device of a diazo copying machine, and as shown in FIG. It is an object of the present invention to provide an automatic sheet feeding device in which the amount of deviation between the cut length of a photosensitive paper sheet and the length of an original document is always zero.

(In order to achieve the above-mentioned purpose, the automatic sheet feeding device according to the present invention has a 1° 4-layer automatic sheet feeder that includes a plurality of paper sheets between the document trailing edge detection signal output terminal of the document trailing edge detector and the drive signal input terminal of the rotary cutter drive control circuit. A delay timer whose delay time is variable is provided by a selection switch, and the selection switch is switched in conjunction with the switching operation of the conveying speed switching means to select the length of the photoreceptor conveyed during the delay time and the time lag. A delay time is set for each conveyance speed so that the sum of the lengths conveyed during that time is always constant, so that the cut length of the photosensitive paper always matches the length of the document. .

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 4 is a block diagram of a control system for a rotary cutter according to the present invention. A document trailing edge detection signal holding circuit 31 and a CR oscillation timer 32 constituted by a capacitor and a resistor are connected in sequence between the output end of the document trailing edge detector 4 and the input end of the rotary cutter drive control circuit 30. ing. The C, R oscillation timer 32 is controlled by selection switches SWI to SWn depending on the conveyance speed and resistors R1 to R? +,
Any one of the resistors is selected, and the resistor and the capacitor inside the timer are connected to form a timer circuit that can obtain a delay time corresponding to each of the above-mentioned transport speeds. Selection switch SWl~SW
The selection of n is made in conjunction with the selection of the transport speed using the transport speed dial.

The operation of this circuit will be explained below with reference to the control timing charts shown in FIGS. 4 and 5.

When paper feeding starts by inserting the original, the trailing edge of the original is detected H?
i 4 can be detected, and when the trailing edge of the document 1 passes through the trailing edge detector 4, it is detected, the trailing edge detection signal holding circuit 31 is activated, and the CR oscillation timer 32 is activated. The delay time of the CR oscillation timer 32 becomes a value suitable for the conveyance speed, depending on the resistance value set in advance by the selection switch in conjunction with the selection of the conveyance speed. After the delay time has elapsed, the cutter drive control circuit 30 operates, and after a certain time lag, the rotary cutter 5 starts rotating.

Rear end detection holding circuit 3 by one rotation of the rotary cutter
1 and CR oscillation timer 32 are reset.

By increasing the number of selection switches, it is possible to finely set the delay time for changes in conveyance speed.

Figure 6 shows the conveyance speed from 75 m/h to 1.200 m/h.
This is a curve showing the relationship between the conveyance speed and delay time of an example in which the present invention is applied to a diazo copying machine that can change the speed up to 15 steps up to %/h, and the maximum speed is 1200 m/h.
For K, the delay time is as short as 0.1 seconds, and for the lowest speed of 75 m/h, the delay time is set as long as 3.2 seconds.

Next, an example of a mechanism for switching the selection switch in conjunction with the selection of the transport speed will be described.

7(a), (b), and (C) are diagrams showing the configuration of the mechanism, and as shown in FIG. 7(C), the switch SW
1 to S W n are arranged at a pitch angle θ on a circumference centered on the switch shaft 24 on a switch board 34 fixed to the transport speed switching device machine frame 33. The selection is made by contacting a switch changeover element 25 attached to the tip of an arm 25a fixed to. At the other end of the shaft 24, a mold wheel 21 is fixed at a pitch angle θ and provided with pawls 21a around the periphery as shown in FIG.

In the valley between the adjacent pawls of the mold wheel 21, there is a click pin 2 provided at the tip of a lever 35 that is pivotally supported on the machine frame 33.
3 is pushed into engagement by the force of a spring 36, and the mold wheel is detented. The mold wheel 21 is provided with a long hole 21b in the circumferential direction, and a dial shaft 2o is implanted in an arm provided at one end of the shaft 19a of the conveyance speed diagram/l'19 provided on the same line as the shaft 24. are mated. The length of the long hole 21b is determined by the pitch angle θ of the tire shaft 20.
It is said to be only a movable length. When the dial shaft 20 is located at the center of the elongated hole 21b, a pair of leaf springs 22 are fixed to the model wheel 21, which sandwich the shaft 20 on both sides without bending. A conveyance speed adjusting variable resistor 29 is fixed to the machine frame 88, and a gear 28 provided at the shaft end of the variable resistor 29 meshes with a drive gear 27 provided in the middle of the switch shaft 24.

The operation of this device will be explained below in order with reference to FIGS. 8(a) to 8(d).

When the speed dial 19 is released, the click pin 23 is inserted into the valley between the claws 21a of the model wheel 21 and the dial shaft 20 is held in place by the two plates, as shown in Figure (a). The elongated hole 21 is caught by the elastic force of the leaf spring due to the spring 22.
It is held so that it is in the center of b. In this state, when the speed dial (V19) is turned counterclockwise, the dial shaft 2° moves to the left inside the elongated hole 21b (as shown in figure bj), since the mold wheel 21 is restrained by the click pin 23. The leaf spring 22 on the left side is pushed to the left and deflects.When the speed dial 19 is further turned counterclockwise, the dial shaft 20 comes into contact with the left end of the elongated hole and presses it, as shown in Figure (c). ,
The mold wheel 21 is rotated counterclockwise against the restraint by the click pin 23, and the click pin 23 is pushed up from the valley of the nail to the top of the nail along the nail surface. In this state, the click pin 28 presses the tip of the pawl 21a toward the center with the force F3, and does not press the pawl 21a to the right or left, so the force F that tries to turn the mold wheel counterclockwise is zero. Then, due to the elastic force F2 of the left leaf spring 22 which is bent, the car 21 rotates in the direction in which the leaf spring 22 is no longer bent, that is, in the counterclockwise direction, and the click pin 23 moves into the valley between the adjacent claws. When the dial shaft 20 is pushed in and the conveyor speed dial /l/19 is released, the dial shaft 20 is held in the center of the elongated hole 21b as shown in FIG. The mold wheel 21 is thus rotated by the pitch angle θ. By continuously turning the conveyance speed dial 19, the car 21 changes the conveyance speed tire/L'19 by one pitch angle θ.
The switch switching element 25, which rotates by one pitch angle θ each time it is turned and rotates integrally with the mold wheel, is always in contact with one of the switches 26 arranged at the same pitch angle θ, and is in contact with two switches at the same time. Also, malfunctions caused by not contacting any switches are prevented. In addition, the rotation of the switch shaft 24 causes the variable resistance shaft 29 to rotate through angles proportional to the rotation angle of the mold wheel via shift gears 27 and 28, and the conveyance speed corresponding to the delay time set by each switch is linked. It can be obtained by

Effects As described above, according to the present invention, in a diazo copying machine that uses roll photosensitive paper and automatically cuts and feeds paper according to the length of the original, no manual effort is required even when the conveyance speed is changed. This makes it possible to always match the cut length of the photosensitive paper with the length of the original without using.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a diazo copying machine to which the present invention is applied, and FIG. 2 is a graph showing the amount of deviation between the sheet conveyance speed and the cut length of photosensitive paper with respect to the document length in a conventional automatic sheet feeding device. FIG. 3 is a similar graph that should be achieved by the apparatus of the present invention, FIG. 4 is a block diagram of the control circuit of the automatic sheet feeding apparatus of the present invention, and FIG. 5 is its timing. 6 is a curve diagram showing an example of the relationship between the sheet conveyance speed and the delay time of the delay timer in the embodiment of the present invention, and FIG. 7 is a curve diagram showing an example of the relationship between the sheet conveyance speed and the delay time of the delay timer in the embodiment of the present invention. Figure 8 shows an example of a device that performs switching.
Figures (a), (b), (c) and (d) are schematic diagrams illustrating the operation of the switching device in sequence. ■...Original, 3...Roll photosensitive paper, 4,18...
Original Ti, rear end detection means, 5... rotary cutter (photosensitive paper cutting means), 19... conveyance speed switching dial,
20...Dial shaft (shaft that engages with the long hole of the model car),
21... Model car, 21a... Claw, 21b... Long hole, 22... Leaf spring member, 23... Click pin (
detent member), 24... switch shaft, 25... switch switching element, 26... switch, 30... photosensitive paper cutting means drive control means, 32... delay timer. Drop (0) (C) (b) (d)

Claims (3)

[Claims] (1) The conveyance speed within the machine is variable, and the leading edge of the fed original is aligned with the leading edge of the photosensitive paper unwound from the roll paper at the same speed, and the original is conveyed to the printing section to overlap and feed the original. A document trailing edge detection signal from a document trailing edge detection device provided in the path activates a roll paper cutting device provided in the photosensitive paper feeding path unwound from the roll paper to cut a sheet of length equal to the length of the document. In an automatic sheet feeding device of a diazo copying machine that cuts and feeds photosensitive paper sheets, the detection signal output terminal of the document trailing edge detection means and the drive signal input of the drive control means of the photosensitive paper cutting means are connected. A delay timer is set between the end of the photosensitive paper sheet and the document length, and the selection of the delay time of the delay timer is linked to the selection of the conveyance speed to prevent the difference between the cut length of the photosensitive paper sheet and the document length caused by changes in the sheet conveyance speed. Correct the difference in amount,
An automatic sheet feeding device characterized in that the cut length of photosensitive paper is always made to match the length of the original. (2) The delay time of the delay timer described above can be selected by selectively contacting the switch switching element with a plurality of switches provided on the circumference at an equal pitch angle to the switching pitch angle of the conveyance speed switching dial. The switching element rotates integrally with a ratchet wheel having pawls formed around it at the pitch angle, and the ratchet wheel is provided on the machine frame and is pressed into the valley of the pawl of the ratchet wheel. The detent is applied by a member that is biased in the direction of
At this detented position, the switch changeover element contacts only one of the switches, and the ratchet wheel rotates one pitch by rotation of the conveyance speed switching dial. 2. The device according to claim 1, wherein the device is adapted to be driven by l pitch angle per pitch angle. (3) The means for rotating the ratchet wheel by the transport speed switching dial includes an elongated hole provided in the circumferential direction of the ratchet wheel, and a means that rotates integrally with the transport speed switching dial and the elongated hole. and a leaf spring member that clamps the shaft fixed to the ratchet wheel and fitted into the elongated hole from both sides without deflection while the shaft is in the center of the elongated hole. Then,
3. The device according to claim 2, wherein the length of the elongated hole is such that the shaft can be moved by an angle equal to the pitch angle of the pawls of the ratchet wheel.