JPS589162A - Automatic sheet paper feed device - Google Patents

Abstract

PURPOSE:To cut roll paper to prescribed length, irrespective of variations of size of an original, by using a shift register as a cutting signal generating means, in an automatic paper feed device of a copying machine, etc. CONSTITUTION:When an original 5 is inserted, a switch 7, and subsequently, a switch 8 are turned on, and a switch flag STF of a microcomputer is set. Also, (d) is set to an address counter, and an initial bit Mo of the address (d) of an RAM is set to ''1''. As a result, a paper feed clutch is turned on, and roll paper is fed into a paper feed port 13, synchronizing with the original 5. A pulse signal P of a pulse generator 15 is applied to an interruption terminal of the microcomputer, following a rotation of a paper feed roller, contents of the RAM memory address (d) are shifted to the left, the back end of the original passes through the switch 7, and after that, a cutting device 14 is turned on when the ''1'' signal has been inputted to a prescribed bit of a prescribed address, therefore, variations of cut size do not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automatic sheet feeding device that cuts roll paper into predetermined dimensions corresponding to the document size and automatically feeds the cut paper into a copying machine ring.

The applicant previously proposed an automatic sheet feeding device that can always cut roll paper into the same predetermined size even if there is some variation in the size of one original, and feed it to copying machines, printing machines, etc. (See Publication No. 55-6901).

However, in the above-mentioned automatic sheet feeder, the cutting dimensions of the roll paper are determined using a cam, a crack, and a chi, which causes wear, play, cracks, and deterioration of chi response characteristics due to changes over time. However, there were disadvantages such as a decrease in cutting accuracy and the need for a large swipe.

In view of the above points, the present invention does not use cams, clutches, or chips for positioning the roll paper to be cut, and even if there is some dirt on the document slide, the roll paper can always be precisely cut to a predetermined size. To provide an automatic sheet feeding device that can cut sheets well and automatically feed them.

Hereinafter, the present invention will be explained with reference to the embodiments shown in the figures.

FIG. 1 shows an embodiment of the present invention, where 1 is a copying machine and 2 is an automatic paper feeder.

A document feed row 24 is provided in the document insertion section 3 of the automatic paper feeder 2, and the inserted document 5 is transferred from the conveyance path 6 to the copying machine l.
transported to. In this conveyance path 6, a microswitch 7 for detecting the trailing edge of a document is provided near the document insertion section 3, and a microswitch 8 for detecting the leading edge of the document is provided near the copying machine 1.

A roll paper 9 of A size width or B size width is loaded into the automatic paper feeder 2, and the inside of the paper is detected by a microswitch 1o. Of course, it goes without saying that this microswitch 1o and the above-mentioned 7 and 8 may be optical switches. The roll paper 9 is fed by paper feed rollers 11 and 12.
The paper 9 is transported to the paper feed port 13. The paper feed port-211.
A rotary roller 14 consisting of a fixed blade 14a and a rotary blade 14b is disposed in the middle of the 12M conveyance path. Further, a nozzle generator 15 is connected to the rotating shaft of the paper feed port 211.

Signal S1 output from micro switch 8), signal 8 output from micro switch 8! As shown in FIGS. 1 and 2, the paper size signal SS output from the microswitch 10 and the Norse P output from the Ruth Generate 5 in synchronization with the paper feed speed are as shown in FIGS. 1 and 2. ! The microcomputer 16 sends operation signals 84+8s to the clutch l1m that drives the paper feeder 211 and the clutch 14e that drives the rotary cartridge 14, respectively. is output.

Now, when document 5 is inserted from document insertion section 3, document 5#i
The document is sent along a conveyance path 6 (by a document feed roller 4) to a copying machine l. In that overcurrent, the micro suiyatia turns on first.
L...Subsequently, the microswitch 8 is turned on. on the other hand,
At this time, the leading edge of the p-page paper 9 is stopped at a position corresponding to the document leading edge detection position of the microswitch 8.

The microcomputer 16 constantly monitors its input ports PIO to P12 and communicates with nine ports in response to the signals input there, but it does nothing even if the microswitch 7 is turned on, and the microswitch 8 is turned ON and nine. and starts processing for the first time.

That is, as shown in the chart 70 in FIG. 3 (1), the microcomputer 16 first monitors the state of the microswitch 8, and if the microswitch 8 is OFF, turns on the flag 8W.
Set F to 0, reset, and wait until Toshi, Micro Switch, and Chi8 are turned ON. This switch flag 8wF is allocated in the RAM, and the state of the microswitch 8 is stored there. When micro switch 8 is turned on,
With switch flag SwF set to 1, micro switch 8
memorize the state of At the same time, out of capo) from P2O.

The operation signal S4 is output to the chiller l1m to turn on the clutch, and the sheet feeding start flag STF is set to 1 to remember that sheet feeding has started. Furthermore, the address counter R
Kd (byte address) is set (5) and the initial bit position [M''] eK1 of the mother byte memory CM in the RAM specified by the contents of the address counter R is set. 4 As shown in Figure 4, set the bit [M] at address d in RAM CJ to 1.
Set to . After that, wait until the microswitch 7 is turned off.

By turning on the camera and chilla, the paper feed slot-211
．． 12 starts rotating, and the roll paper 9 is conveyed to the paper feed port 13 in synchronization with the document 5. As mentioned above, the leading edge of the roll paper 9 before the start of transport corresponds to the position where the microswitch 8 detects the leading edge of the document 5, and both are located at a distance from the paper feed port 13, so the leading edge of the document 5 is detected by the microswitch. The leading edge of the roll paper 9, which starts to be conveyed at the same time as it passes the detection position 8, is overlapped with the leading edge of the original document 5 at the paper feed port i3 in a state where it exactly coincides with the leading edge of the original document 5, and is sent to the copying machine 1).

On the other hand, as the paper feed roller 110 rotates, /l russ P is generated from the Nars generator 15, and this mother russ P
is input to the interrupt terminal INT of the microcomputer 16. Then,
The microcomputer 16 temporarily suspends the processing in the main routine shown in FIG. 3(i) and shifts to the interrupt routine shown in FIG. 3(b).

In this interrupt routine, the start flag STF' is set to "1".
” and is specified by the contents of address counter R at that time! 4 Memory rM shown in Figure 4
J Shift contents to the left. Even if you shift left, the memory r
If there is no carry CY from MJ, the it third
Returning to the main routine shown in Figure (m), the process resumes from the interrupted step. However, if a carry CY occurs by shifting to the left, the contents of the address counter R are incremented by one, the next memory address is specified, and the initial pit [M] of the specified memory CM) is incremented by one. ``1''
After that, return to the main routine. This process is repeated every time No4rus P occurs.

In this way, in this embodiment, a specific area of RAM, that is, a memory portion from address d to address d+n is used.
A shift register is configured by the program, and the initially set "1" is sequentially shifted by one bit by the /# pulse P generated from the /nars generator 15.

Eventually, when the trailing edge of the original 5 passes through the microswitch 7 and the microswitch turns OFF, the paper on the roll paper 9 set in the automatic paper feeder 2 is removed (depending on the ON/OFF state of the microswitch 10). Determine the inside of the paper, and depending on the paper content, next time, change the shift register's "
It is determined whether the IJ position has reached a bit position previously set in accordance with the cutting dimension.

That is, the "1" set in the bit position d (CM) in FIG. 4 is sequentially shifted from Nonorus PK. In other words, the shift position corresponds to the conveyed length of the roll paper 9. Therefore, A out of 90 roll papers? The bit positions on the shift register corresponding to the respective cutting dimensions are set and stored in advance according to the size and B size. For example, the cutting dimension A of size A is [M
]7 B.

position, B size cutting dimension B is CM at address d) *
Set and store the bit position in advance.

On the other hand, at the time when the microswitch 7 is turned off, the shift position of "1" on the shift register has reached the position before the cutting dimension bit position of the roll paper 9 corresponding to the original 5. In other words, if we assume that the inside of the roll paper 9 is A size and the length of the original 5 is an illusion ±α (0<α<A1), the microswiatia is placed at a position that is slightly shorter than the specified size, that is, the original is slightly shorter than the specified size. Since the insertion part is installed at a position offset in three directions, the position of "1" on the shift register at the time the microswitch is turned off is the (AI) bit position and (AI-1).
) exists between bit positions.

After the micro switch is turned off, "l" on the shift register is further shifted in accordance with the pulse P generated from the p4 pulse generator 15, and after a while, (
AI) bit position is reached.

When the microcomputer 16 determines that the shift position has changed to the (Al) bit position, it outputs a signal SI, turns the input, output and input 14c ONL, and cuts the roll paper 9. As a result, even if there is some variation in the length of the original 5, the roll paper 9 always corresponds to the original 5.

On the other hand, the microcomputer 16 rotates the paper feed roll 11 for a while after cutting the roll paper 9 to convey the roll paper 9, and when the leading end of the roll paper 9 reaches the position corresponding to the microswitch 8,
The clutch 11 a t-0FF is applied to stop conveyance of the roll paper 9. After that, start flag 8TF, RA
M (D Reset the contents from address d to address d + n, and return to the initial step. However, at this time, there is still manuscript 5.
If the rear end has not passed through the micro switch 8, the switch flag is 1, so the OF of the micro switch 8 is
'F and when the original 5 passes through the micro switch 8, SwFl is reset and toggled to return to the initial state and prepare for the next paper feeding.

In the above embodiment, a microswitch 10 is provided to detect the inside of the roll paper 9 set in the automatic paper feeder, and the cutting pit position is set on the RAM constituting the shift register for size A and size B. The cutting position is set separately for each size, and the cutting position is determined separately depending on the inside of the roll paper 910), but the micro switch 10 can be omitted and it is possible to distinguish between A size and B size. There is nothing good about trying to process it without any problems.

As described above, according to the present invention, no conventional mechanical parts such as cams, clutches, and chips are used to determine the cutting position of the roll paper, so the roll paper can be cut with high precision, and the original Paper of a predetermined size can be automatically fed regardless of irregularities in size.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the main parts of a Shinito automatic paper feeder showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of a signal system input and output to the microcomputer shown in Fig. 1, and Figs. 3(a) and Cb ) is a flowchart of the main routine and interrupt routine executed by the microcomputer, and FIG. 4 is a memory diagram illustrating the usage state of the RAM of the microcomputer. DESCRIPTION OF SYMBOLS 1... Copying machine, 2... Automatic paper feeder, 3... Document insertion section, 4... Document feed roller, 5... Document, 6...
...Conveyance path, 7.8.10...Micro switch, 9
... Roll paper, 11.12 ... Paper feed roller, l1m
, 14c...Clutch, 13...Paper feed slot, 14...
・Rotary cutter, 14m...Fixed blade, 146...
Rotating blade, 15...4 Ruszoenerator, 16...
Microcomputer. Figure 3 (0) (b)

Claims (1)

[Claims] A first detector that detects the leading edge of the document being conveyed, a second detector that detects the trailing edge, a roll paper conveyance device that conveys the roll paper in synchronization with the conveyance of the document, and a cutter for cutting the roll paper. In an automatic sheet feeding device that cuts out and feeds sheets according to document dimensions from a roll paper, an input pulse generator generates nine pulses in synchronization with the roll paper conveyance speed; Said 1st. a microcombination device that outputs a roll paper transport signal, a force signal, and a ripping operation signal according to the signal from the second detector and the synchronization/error signal, and when the first detector detects the leading edge of the document; At the same time as the transport of the roll paper is started, the initial bit of the data memory for the shift register is set to 9 "1" and shifted every time the synchronization/parallel pulse is input, and the second detector detects the trailing edge of the document. Later, it is determined whether "1" exists or not in multiple bit positions corresponding to the preset cutting dimensions, and "
1. An automatic sheet feeder characterized in that if there is no "1", the conveyance of the 11 roll paper is continued, and if there is a "1", the force and evening operation signals are output.