JPS63253374A - Image forming device - Google Patents

Abstract

PURPOSE:To eliminate the need for an operator to input a cutting size by confirming the state of a picture signal and discriminating whether roll sheets are cut in either a fixed width size or a fixed length size. CONSTITUTION:The roll sheets 31 and 33 are cut in the fixed width size or the fixed length size by means of a cutter 41 in accordance with a cutting signal. Based on a timer means and the picture signal showing picture length determined by the length of an original in a picture scanning direction and by a selected copying magnification, a discrimination means automatically discriminates how the roll sheets 31 and 33 are to be cut, i.e., whether in the fixed length or width size. Thus the operator need not input the length cut.

Description

[Detailed description of the invention] 9 selected monthly amounts on the skin! The present invention relates to an image forming apparatus such as a copying machine or a printer, and particularly to a control mechanism for cutting roll paper on which an image is formed.

and its bell.

Generally, in a copying machine that forms an original image on a roll paper loaded in a paper feed section, there are two methods for cutting the roll paper: a synchro cut method and a standard size cut method.

As shown in Japanese Patent Publication No. 56-26021, the synchronized cut method cuts roll paper to a length equal to the length of the original in the image scanning direction multiplied by (n), where the copying magnification is (n). do. However, in this method, the cut length varies depending on the document length and copying magnification, and handling of the paper after cutting is complicated.

The fixed size cut method is convenient for handling because the cut sheets are the same size. By the way, roll paper can be cut into two types of standard sizes by horizontal cutting with the long side in the width direction and vertical cutting with the short side in the width direction. Which cut to perform is determined based on the length of the document and the copy magnification. Therefore, in the past, the
As disclosed in Japanese Patent No. 92, the cut length is determined by a combination of a roll paper width detection switch and a cut size changeover switch. Or Tokuko Sho 61
As shown in Publication No. 12258, when the roll paper width size matches one side of the copy size, a corresponding cut is made on the other side using a roll paper width size detection switch and a copy size selection switch. I'm trying to do it.

However, with any of these devices, it is necessary for the operator to input the cut size and copy size, which may lead to input errors depending on the case, which is not desirable in terms of usability.

5. Means for performing the following: Therefore, the image forming apparatus according to the present invention includes (i) a detection means for detecting the width size of the roll paper loaded in the paper feed section; (i) a length of the document in the image scanning direction; (i) generating means for generating an image signal indicating an image length determined by the selected copying magnification; (~) When the timer means finishes counting, it determines the state of the image signal and determines whether to cut the roll paper at a horizontal standard size or a vertical standard size. (v) Cutting means that cuts the roll paper using a cut signal based on the determination result of the determining means.

In configurations such as New Year-Monday and above, the cut length of the roll paper, that is, whether it is cut into a horizontal standard size or a vertical standard size, is determined by the length of the original in the image scanning direction and the selected copy magnification. The discrimination is automatically made by the discrimination means based on the image signal indicating the image length deafness and the timer means. Therefore, the operator does not need to input each cut length into the device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, one embodiment of an image forming apparatus according to the present invention will be described with reference to the accompanying drawings. This embodiment includes a toner image transfer type copying machine body (1) and an automatic document circulation conveyance device (hereinafter referred to as RADF) that automatically circulates documents by the number of copies.
(50).

[Copying machine main body] In Fig. 1, the copying machine main body (1) has a photosensitive drum (2) installed approximately in the center so as to be rotatably driven in the direction of arrow (a), and a main eraser lamp ( 3), electrification charger (4), inter-image eraser lamp (5), magnetic brush type developing device (6), transfer charger (7), paper separation charger (8), separation claw (9), blade type A cleaning device (10) is arranged.

The optical system (20) includes an exposure lamp (21) and a mirror (22).
).

(23), (24), lens (25), mirror (26)
), and R A D F (50
), the image of the document being conveyed on the document slit glass (27) is formed on the photosensitive drum (2). Lens (2)
5) The mirror (26) is operated by a motor (M) according to the copying magnification.
2) in the optical axis direction.

For each copy, the photoreceptor drum (2) has its residual charge erased by the main eraser lamp (3), is given a predetermined charge by the charger (4), and the original image is recorded by the optical system (20). An image is formed to form an electrostatic latent image. This electrostatic latent image is turned into a toner image by a developing device (6).

On the other hand, the paper feed section consists of a top paper section (30), a bottom picture paper section (32) into which roll paper (31) and (33) can be selectively loaded, and a manual paper feed section (34) for cut paper. It is configured.

The roll paper (31), (33) is the roller (35), (
A pair of paper feed rollers (37), (38) via
The paper is pulled out from the paper, guided by various guide plates, fed to a pair of timing rollers (40), and temporarily put on standby. Also, the cut paper inserted from the manual paper feed section (34) is passed through a pair of paper feed rollers (39) to a timing roller (40).
The paper will be fed until the paper is loaded, and then it will wait for a while. Timing roller (40
) is rotated by a predetermined timing signal, and the toner image is transferred to the paper by the discharge of the transfer chiller (7), and the toner image is transferred to the paper by the AC discharge by the separation charger (8) and the photoreceptor by the separation claw (9). Separated from drum (2).

The timing signal is issued at the timing when the leading edge of the image formed on the photosensitive drum (2) and the leading edge of the paper are synchronized in the transfer section. Also, roll paper (31>).

(33) is cut into a horizontal or vertical size by a cutter (41) based on a cut signal which will be described in detail below. After the transfer, the paper is transferred to a fixing device (43) via a conveyor belt (42) equipped with an air suction means (not shown).
There, the toner is fixed, and the toner is discharged to the outside of the main body (1) by the first discharge roller (44).

Further, the paper is conveyed vertically upward by belts (45) and (46), and is discharged onto a paper discharge tray (48) by a second discharge roller (47).

The photosensitive drum (2), paper feeding system, and conveyance system are driven by a main motor (Hl).

The main paper feed section (30) and the sketch paper section (32) each have three sets (7) of 74 cross 4 (SWI) to (SW3
), (SW4) to (SW6) are installed. These switches are turned on and off by protrusions provided for each width size as the roll paper is set, and depending on the combination of on and off, the set roll paper ( 31) and (33), and also detects the presence or absence of roll paper.

Table 1 below shows the switch (SWI) for the main paper feed section (30).
) to (SW3), this [Table 1
] indicates that the switch is turned on as "rO" and off as "1", and if all the switches are off, it means that the roll paper is not fully set in the main paper feed section (30). Paper section (32) switch (S$J4) ~
(SW6) also performs similar detection.

[Hereinafter, white thread] [Table 1] Various sensors are also installed inside the copying machine main body (1). Senna (Psi) and (PS2) are for detecting cut paper inserted into the manual paper feed section (34).

Sensors (PS3) and (PS4) are connected to the upper and lower paper feed sections (30
), (32) loaded roll paper (31), (3
3). The sensor (PS5) is located just before the timing roller (40), and the sensor (PS6)
, (PS7) are discharge rollers (44) and bar 47) respectively.
Immediately after, the arrival and passing of paper 2 is detected. These sensors 1 are also used to detect paper jams and to control other operations of the copying machine main body (1).

[Automatic document circulation feeder (RADF)] In FIG. 1, the RADF (50) includes a document table (51), document conveyance rollers (52) to (57), document ejection tray (60), and document conveyance motor (M3). ).

Each of the transport rollers (52) to (57) includes driven rollers (52a), (53a), and (53b) to (57a), and guide members for transporting the original are appropriately installed around them. . In addition, conveyance rollers (54), (5
5) is a switching claw (61) for switching the circulation conveyance path.
, (63) and guide plates (62), (64), and the conveying roller (53) is provided with a switching claw (65) and a guide plate (66) for switching between circulating and discharging the document.

That is, when the switching claw (61) is also entered with the switching claw (65) entered into the conveyance path, the document is circulated and conveyed between the transport rollers (53) and (54), and then the switching claw (
63), the conveyance rollers (53) and (55)
When the switching claws (61>, (63) are retracted), the transfer rollers (53), (56) are circulated.

On the other hand, when the switching claw (65) is retracted from the conveyance path, the original changes from the conveyance path to the low conveyance path. (57) to the output tray (60>
is discharged to the top.

Each of the above-mentioned transport rollers (52) to (57) is rotationally driven by a document transport motor (M3), and the transport speed is set to (V
), the conveying speed (V) at 0 equal magnification, which is controlled to (V/n) with respect to the copying magnification (n), is the photosensitive drum (
2) is equal to the peripheral speed and paper conveyance speed.

In addition, each sensor (PS8) to (Pst
t) is installed. The sensor (PS8) detects the inserted document, and the sensor (PS9) detects the optical system (20).
The original is detected immediately before the light irradiation position by the exposure lamp (21>), the sensor (PSIO> detects the original at the circulation/ejection switching section, and the sensor (PSII) detects the original that can be completely ejected.

Next, to briefly explain its operation, the document table (51
) When the sensor (PS8) detects the leading edge of the document inserted from the
) to (57) are rotated at a peripheral speed corresponding to a preselected copying magnification. Here: lol, the draft is RAD F (
50) and passes over the glass (27) to receive light irradiation from the exposure lamp (21), and the reflected light is imaged on the photoreceptor drum (2). At the same time, the length of the document is detected by a combination of various sensors and timers, and switching claws (61) and (63) are selected depending on the document length.
) operates and the document passes through the shortest circulation conveyance path.When the leading edge of the 0M document is detected by the sensor (PSIO), it is determined whether or not copying is complete. If not, the switching claw (65) is operated to circulate the document by the conveyance roller (53). When the circulation for one copy is completed, the original is directly ejected onto the ejection tray (6o) through the conveyance roller (57), and the trailing edge is connected to the sensor (PS).
ll), the motor (M3) stops.

[Operation Panel In Figure 2, the operation panel has the following keys,
Display means etc. are installed. Each key has an internal switch that is turned on by pressing it.

(100) is a stop key for stopping the document transport operation of RADF (50), (101) to (110) are numeric keys for entering numbers such as the number of copies, (111)
is a clear key that functions as a stop key to cancel the multi-fubi midway through, and a clear key to clear the set numbers.
A stop key (112) is an interrupt key for executing interrupt copying, (113) and (114) are a magnification up key and a magnification down key to increase and decrease the copy magnification in steps. (115) and (116) are the exposure amount up key and exposure amount down key that increase or decrease the exposure amount in steps, (117) is the select key for the top paper section (30) or the bottom picture section (32), (118) ) is enlarged.

Copy magnification select key with two presets of normal size and reduction, (119) is the zoom magnification select key for selecting two types of zoom magnification that are preset by the user, (120) is the zoom magnification (121) is the synchro cut designation key to cut the roll paper in synchronization with the length of the document.

The operation panel has a display as explained below, ED and a fluorescent display tube. ! (14Q).

(122) and (123) are LEDs that display that the roll paper loaded in the top paper section (30) and the bottom picture paper section (32) has been selected, and the paper feed section select key (11)
7) Rotate each time the on operation is performed.

(132) and (133) are roll paper width size display areas,
Display is performed based on signals from the switches (Swl) to (SW6) installed in each paper feed section (30), <32). (124) to (127) are copy magnification selection display LEDs, which are one of the copy magnification selection keys (118).
Rotates every time the switch is turned on. (12B)
, (129) is a zoom magnification selection display LED, which is rotated every time the zoom magnification selection key (119) is turned on. (130) and (131) are synchronized cut selection display L for the upper and lower roll paper.
In ED, rotation is performed each time the synchronized cut designation key (121) is turned on.

In the display section <140) using a fluorescent display tube, (141
) is a two-digit display segment that displays the number of copies, etc.

(142) is a four-digit display segment that displays the selected copy magnification, (143) is a pictorial display that instructs a serviceman call, and (144) is a step display of exposure amount.

(145) is a toner empty display, (146) is a roll paper empty display, and <147) is a paper jam warning display.

(148) is the display during interrupt copying, (149) is the wait display during temperature control, movement of the lens (25), etc.

[Control circuit Figure 3 shows the microprocessor (hereinafter referred to as CPU) (201) that controls the main body of the copying machine (1), and the RA
C controls the DF (50) and optical system (20)
The input/output configuration of PU (215) is shown.

The CPU (201) is an input/output expansion integrated circuit (hereinafter referred to as I
(denoted as C) (202) to (204), (206)
~(20g). IC(202)～(2
04) is used as an input IC, and the CPU
(201) is connected with a data line via a decoder (205). Various keys, switches, sensors, etc. are connected to the input terminal. IC(206)～(
208) is used as an output IC, and the control board connects the CPU (
201).

In addition to various parts, the output terminal includes a display section (140) using a discount display tube, and LEDs (122) to (131).
is connected to the LED matrix <209> consisting of C
Each is controlled by a PU (201) via a decoder (211). Random access memory (hereinafter referred to as RAM) (212) is the CPU (201)
The memory is backed up by a battery.

Further, the CPU (201) sends a value selected from among the nine-step exposure values to the light control circuit (213) as data.

On the other hand, the input/output port of the CPU (215) is RADF (
50) document withdrawal motor (h3) foot roll circuit (
216), a control circuit (217) for a motor (H2) that moves the lens (25) and mirror (26) according to the selected copy magnification. Also,
Each sensor (Psi) ~ (PS
The on/off signal from ll) can be input completely, and the switching claw (61).

(63), turns on the solenoid that drives (65),
An off signal is output. Furthermore, the CPU (215)
It is connected to the PU (201) for communication via a bus (214).

[Control Procedure] Hereinafter, the control procedure of this embodiment will be described in detail with reference to FIGS. 4 to 16b.

Figure 4 shows the CPU (20) that controls the copying machine main body (1).
1) shows the main routine.

When the CPU (201) is reset and the program starts, first, in step (Sl), the RAM (
212), initialize various registers, and make initial settings to put each device into the initial mode. Next, in step (S2), an internal timer of the CPU (201) is started. This internal timer determines the time required for one routine of this main routine, and its value is set in advance in step (Sl).

Next, the subroutines shown in steps (S3) to (S5) are sequentially called, and when the processing of all subroutines is completed, the process waits for the internal timer to end in step (S6), and then returns to step (S2). The time length of this one routine is used to count the various timers that appear in each subroutine, that is, the end of counting is determined based on how many times this one routine has been repeated for the various timer values.

Further, when an interrupt request is received from the CPU (215) while various processes are being executed, the CPU (215) requests an interrupt in step (S7).
5) performs data communication with.

Figures 5a and 5b show the main routine steps (S3
) shows the copy operation subroutine executed in ().

First, in step (510), it is determined whether the document insertion signal is "1."
When the document insertion signal is detected in step S8), it is set to "1" [see step (5221)]. (511) sets the copy start flag to "1"
Set to .

Next, in step (512), the copy start flag is set to "1".
If it is set to "1", the main motor (Ml), the developing motor, etc. are turned on in step (513), and the charger (4) and transfer charger (7) are turned on.
etc., set the copy start flag to rOJ, and set the timers (TA) and (IB).

Then, in step (514), it is determined whether or not the overprint paper section (3o) is selected, and if YES, step (514) is performed.
515), turn on the clutch of the overprint paper roller (37),
If NO, the clutch of the sketch paper roller (38) is turned on. Now the selected roll paper (31) or (33)
) is fed toward the timing roller (4o).

Next, when the judgment end timing of the timer (IA) is confirmed in step (517), the clutches of paper feed rollers (37) and (38) are turned off in step (518).

In addition, when the judgment end timing of the timer ('IB> is confirmed in step (519), step (520)
The scan signal is set to ``1''.The scan signal is set to
Move the document from the sensor (PS9) position to the exposure lamp (21).
This is a signal for transporting the object toward the light irradiation position.

Next, in step (521), the timing signal is set to rl.

Determine whether or not. The timing signal is generated by the photoreceptor drum (2
) is used to synchronize the leading edge of the original image formed on the top of the paper with the leading edge of the paper at the transfer position, and the following step (5232
) is set to ``1.'' This timing signal is rl
, is sent from the CPU (215), the timing roller (
40) Turn on the clutch. At this point, the roll paper begins to be conveyed from the timing roller (40) to the transfer position.

Next, in step (523) it is determined whether the sensor (PS5) is off-edge. The roll paper is cut as explained in FIGS. 6a and 6b, and when the cut trailing edge passes, the sensor (PS5) is turned off.

If the sensor (PS5) is off-edge, step (5)
24), turn off the charger (4), reset the scan signal to "0", and turn off the timing roller (40).
) disengage the clutch.

Next, in step (525), it is determined whether the return signal is 11''. The return signal is sent to the sensor (
PSIO) is set to “1” when detected by [
Refer to step (5239)] Therefore, when the CPU (215) transmits that the return signal has been set to rl, it is determined in step (526) whether or not multi-copying has been completed. If it has not finished, set the copy start flag to "1" in step (529),
Preparations are made to start the copy operation again. When the multi-copy operation is completed, that is, when the copy operation for the set number of copies is completed, the sensor (PS) is activated in step (527).
6) Determine whether or not it is an off-edge. If the trailing edge of the paper passes the sensor (PS6) and the sensor (PS6) is off-edge, the developing motor, transfer charger (7), etc. are turned off in step (528), and the timer (IC) is set. Furthermore, in step (53G), the timer ('fc
), the main motor (Ml) is turned off in step (531), the results of the processing up to now are outputted in step (532), and this subroutine ends.

Figures 6a and 6b show the steps (S4) of the main routine.
) shows the paper cut subroutine that is executed.

First, in step (540), it is determined whether the original image signal is "1". The original image signal is set to "1" when the leading edge of the original inserted into the RADF (50) reaches the light irradiation position on the glass (27) [step (522)]
9)], and when the CPU (215) transmits that this document image signal is set to "1.", the paper feed section (3o) or (3) selected in step (541) is
2) Roll paper (31) or (33) set in
A timer (T1) corresponding to the width size of is set. This timer (T1) is set, for example, to the time it takes for the roll paper to be conveyed by an arbitrary intermediate dimension between the horizontal standard size and the vertical standard size of the roll paper.

Next, in step (542), it is determined whether the timing signal is "1", that is, whether it is the timing to turn on the timing roller (4o) and convey the roll paper to the transfer position. If the timing signal is r□, step (547
), and if it is set to ``1'', step (54
3) Set the timing flag to "1". Next, in step (544), the size determination completion flag is set to "1".
Determine whether or not. The size determination end flag is set to rl when the determination of the size to cut the roll paper is completed [see step (558)]. Therefore, if it is set to 'IJ, the process moves to step (547>). r□
, the paper source (3) selected in step (545)
Roll paper (31) set in 0) or (32)
Alternatively, a timer (T2) corresponding to the width size of (33) is set. This timer (T2) can be set to the time required to cut the roll paper into a horizontal size. Then, in step (546), the timer T2 set flag is set to rl.

Next, in step (547), the timer (T1) is subtracted,
In step (548), it is determined whether the timer (T1) has finished counting. If the timer (T1) has not expired, the process moves to step (559), and if it has finished, it is determined in step (549) whether or not the original image signal is "rO". yXX Both image signals are reset to "10" when the rear edge of the original passes the light irradiation position on the glass (27) [see step (5237), that is, the original image signal corresponds to the copy magnification of the original. By being conveyed at the same speed,
It has a meaning as a signal indicating the image length determined by the image scanning direction length of the original and the selected magnification.
When the CPU (215) transmits that the timer T2 has been reset to "0", the timer T2 set flag is set to r□ in step (550).

Determine whether or not. If the timer T2 set flag is set to "1", the size determination end flag is set to "1" in step (558). Also, if the timer T2 set flag is "0", the width size of the roll paper (31) or (33) set in the paper feed section (30) or (32) selected in step (551) Set the corresponding timer (T3). This timer (T3) is set to the time required to cut the roll paper into a horizontal standard size.

On the other hand, if the document is still passing through the light irradiation position and it is determined in step (549) that the document image signal has not yet been set to rl, then the timer T2 set flag is set to rl, rl, in step (553). Determine whether or not. Timer T
If the 2-set flag is set to "1", the paper feed unit (30) or (32) selected in step (554)
A timer (T4) is set by correcting the timer (T2) in accordance with the width size of the roll paper (31) or (33) that has been completely set. This timer (T4) is a timer (
T2) is corrected to the time required to cut the roll paper into a vertical size and set. And step (555
), the timer T2 set flag is reset to "o", and the timer T4 set flag is set to "11", and in step (558), the size determination end flag is set to rl. On the other hand, if the timer T2 set flag is 1"0", the paper feed section (30
) or (32) to set a timer (T5) corresponding to the width size of the roll paper (31) or (33). This timer (T5) can be set to the time required to cut the roll paper into a vertical size. Then, in step (557), the timer T5 set flag is set to "1", and in step (558), the size determination end flag is set to "1".

That is, in the above cut size determination routine, the state of the original image signal is determined when the timer (T1) finishes counting, and if the original image signal is reset to rO (see steps (548) and (549)), , it is determined that the cut is to be made into the horizontal standard size, and if it remains set to "1", it is determined that the cut is to be made into the vertical standard size. Specifically, if the original image signal has been reset to r□, and at this time the timing signal has already risen to 11'', the image signal for cutting to the horizontal standard size set in step (545) is Keep the timer (T2) set. Further, if the timing signal has not risen to "1", a timer (T3) for cutting to a horizontal standard size is set in step (551). On the other hand, if the timing signal rises to "1" while the original image signal remains set to rl, that is, the timer (T
2) is set, in step (554) this timer (T2) is corrected and a timer (T4) for cutting to a vertical size is set. Further, if the timing signal has not risen to "1", step (55
6) Timer (T5) for cutting to vertical size
Set.

After determining the size to be cut as described above, it is determined in step (559) whether or not the timing flag is "1", and if it is '1', that is, the roll paper is transported from the timing roller (40). , steps (560), (564), (568), (
572), it is determined whether each timer set flag is rl, and the following routines set to ``1.'' are executed. That is, each step (561), (S65
), (569).

At (573), timers (T2), (T3), (τ4),
(T5), each step (562), (566
), (570), (574) are the timer (T2),
After confirming that (T3), (T4), and (T5) have finished counting, each step (563) and (56
7), (571).

(575) turns on the cutter (41), resets each timer set flag to ``0'', and resets the timing flag and size determination end flag to ``0''. It will be cut to the horizontal or vertical size.

FIG. 7 shows the key processing subroutine executed in step (S5) of the main routine.

In this subroutine, in step (5100), the magnification up key (113) is processed, and the step (stol
) to process the magnification down key (114) and step (st
o2) to process the interrupt key (112), step (51)
03) to process the paper size select key (117), and step (5104) to process the step exposure key (115)
, (116), and the document stop key (100) are sequentially executed in step (5105).

FIG. 8 shows a subroutine for processing the magnification up key (113) executed in step (5100).

First, in step (5110), the magnification up key (113
), the step (Sill) is confirmed.
The magnification key displays LED (124) to (129) are turned off, and l/1000 is added to the magnification in step (5112). This is repeated every time the magnification up key (113) is pressed, and as a result, when it is determined in step (s1t3) that the magnification exceeds the maximum setting value of 1.420, the magnification is increased to 1.420 in step (5114). to correct.

FIG. 9 shows a subroutine for processing the magnification down key (114) executed in step (5101).

First, in step (5120), use the magnification down key (114).
) is confirmed to be on-edge, step (5121)
Turn off the magnification key display L E D (124) to (129) in step (5122) and change the magnification to 1/1000.
Subtract. This is repeated every time the magnification down key (114) is pressed, and as a result, step (5123)
If it is determined that the magnification has fallen below o, soo, the magnification is corrected to o, soo in step (5124).

FIG. 10 shows the subroutine for processing the interrupt key (112) executed in step (5102).

First, when it is confirmed in step (5130) that the interrupt key (112) is on, the 0 display (148), which determines whether the interrupt copying display (148) is turned off, is turned off in step (5131). If so, the display (148) is lit in step (5132), the current FP and 8-mode are memorized in the RAM (212), and if the 0 display (148), which allows interrupts, is lit. ,
In step (5133), the display (148) is turned off and the copy mode is restored.

FIG. 11 shows a subroutine for processing the paper size select key (117) executed in step (5103).

First, when it is confirmed in step (5140) that the paper size select key (117) is on, it is determined in step (5141) whether or not the overprint paper section (30) has been selected. If the top picture paper section (30) has been selected, the bottom picture paper section (32) is selected in step (5142). Furthermore, if the sketch paper section (32) has been selected, the top picture paper section (30) is selected in step (5143). Then, the paper size set in the paper feed section (30) or (32) selected in step (5144) is displayed on the display section (132) or (133).

FIG. 12 shows a subroutine for processing step exposure keys (115), (116), and (116) executed in step (5104).

First, in step (5150), the exposure up key (115
) is confirmed to be on-edge, step (5151)
It is determined whether the exposure step is the maximum value or not. If it is the maximum value, the process moves to step (5156), and if it is not the maximum value, the exposure step is increased by one step in step (5152).Next, in step (5156), the exposure step data is sent to the dimming circuit (213). .

On the other hand, in step (5153), the exposure down key (116) is
) is confirmed to be on-edge, step (5154)
It is determined whether the exposure step is the minimum value or not. If it is the minimum value, the process moves to step (5156), and if it is not the minimum value, the exposure step is decreased by one step in step (5155).Next, in the same step (5156) as described above, the exposure step data is transferred to the dimming circuit (213). ).

FIG. 13 shows a subroutine for processing the original stop key (ioo) executed in step (5105).

First, in step (5160), the original stop key (10
When the on-edge of 0) is confirmed, step (5161
) to set the original stop signal to "1". continue,
In step (5162), the operation of each element of the copying machine main body (1) is stopped. At the same time, step (5163)
Set the copy start flag and scan signal to "04" and "7".
and reset the timers (TA), (IB), and (TC).

FIG. 14 shows the main routine of the CPU (215) that controls the optical system (20) and RADF (50).

When the CP tJ (215) is reset and the program starts, first, in step (5200), various registers are initialized and initial settings are made to put each device into the initial mode.
) starts the internal timer of the CPU (215). This internal timer determines the time required for one routine of this main routine, and its value is set in advance in steps (52
00).

Next, the subroutines shown in steps (5202) and (5203) are sequentially called, and when the processing of all subroutines is completed, the process waits for the internal timer to end in step (5204), and then returns to step (5201). The time length of this one routine is used to count the various timers that appear in each subroutine, that is, the end of counting is determined for the various timer values based on how many times this one routine has been repeated.

Also, if an interrupt request is received from the CPU (201) while various processes are being executed, the CPU (201) requests an interrupt in step (5205).
01).

FIG. 15 shows the lens control subroutine executed in step (5202) of the main routine, in which the motor (M2) is controlled in accordance with the copy magnification transmitted from the CPU (201) in step (5210), and the lens (25 ), move the mirror (26).

Figures 16a and 16b show the main routine steps (
5203) shows the subroutine of the document transport foot roll executed in step 5203).

First, in step (5220) it is determined whether the sensor (PS8) is on-edge, and if it is on-edge, step (5220) is performed.
5221), the document insertion signal is set to "1" and the document conveyance motor (M3) is turned on. Now the manuscript is RAD
F (50). Next, step (52
22) Determine whether the sensor (PS9) is on-edge or not. If it is on-edge, that is, if the leading edge of the document reaches the sensor (PS9), the document withdrawal motor (M3) is activated in step (5223). OFF, and reset the return signal and document insertion signal to "0".

Next, in step (5234) it is determined whether the scan signal is "1" or not, and if it is "1", [see step (520)], in step (5225)
Turn on. In this case, the motor (M3) is controlled at a speed according to the copy magnification, and the original is conveyed from the sensor (PS9) position e.
) to set the timer (TD) and (TE). The timer (TD) is set to the time required for the leading edge of the document to reach the light irradiation position on the glass (27) from the sensor (PS9), taking into account the document transport speed according to the copy magnification. Further, the timer (TE) is similarly set to a time at which the timing for turning on the timing roller (40) is issued in consideration of the document conveyance speed according to the copy magnification.

Next, in step (5227), the timer (TD) is subtracted, and in step <5228), it is determined whether the timer (TD) has finished counting. When the timer (TD) ends, that is, when the leading edge of the document reaches the light irradiation position, the document image signal is set to "1" in step (5229).

Next, in step (5230), the timer (TE) is subtracted, and when it is confirmed in step (5231) that the timer ('fE) has finished counting, the timing signal is set to 11'' in step (5232).

Next, in step (5233), it is determined whether the sensor (PS9) is off-edge or not, and if it is off-edge, step (5233) is performed.
5234) sets the timer (TF) and resets the timing signal to rO. The timer (TF) is set to the time required for the trailing edge of the document to pass from the sensor (PS9) to the light irradiation position, taking into consideration the document transport speed according to the copy magnification. Next, in step (5235), the timer (TF) is subtracted, and when it is confirmed that the timer (TF) has finished counting in step (5236), step (5235) is performed.
237), the original image signal is reset to r□.

Next, in step (5238) it is determined whether the sensor (PSIO) is on-edge, and if it is on-edge, the return signal is set to I"1" in step (5239),
In step (5240), it is determined whether copying is complete.

If copying is completed, press the switching claw (
65) is set to eject the original with it turned off. On the other hand, if the copying is not completed, in step (5242) the switching claw (65)
Turn on to switch to document circulation.

Next, in step (5243) it is determined whether the sensor (PSII) is off-edge or not, and if it is off-edge, a timer (TG) is set in step (5244). Timer (
TG> is set to the time from when the trailing edge of the original passes the sensor (PSII) until it is ejected to the ejection tray (60). Therefore, in step (5245) the timer (TG
), and when it is confirmed in step (5246) that the timer (TG) has finished counting, in step (5247) the original conveyance motor (H3) is turned off and the return signal is reset to "0."

On the other hand, in step (5248), the original stop signal is
, and if it is "1", [step (516
1)], and in step (5249) the document transport motor (
M3) is turned off. At the same time, in step (5250), the timing shop name, return signal 1w, and both image signals are r□.

and reset the timer (TD), (TE), (TF
), (TG) and stop controlling the RADF (50).

[Other Examples] Note that the present invention is not limited to the above embodiments,
Various modifications can be made within the scope of the gist.

In particular, regarding document scanning methods, in addition to RADF, which circulates the document, there are also methods that transport the document one sheet at a time.
A method in which the document table is moved back and forth, or a method in which the document table is fixed and the optical system is moved back and forth may be used.

As is clear from the above description, according to the present invention, there is provided a detection means for detecting the width size of the roll paper loaded in the paper feed section;
generating means for generating an image signal indicating an image length determined by the length of the document in the scanning direction and the selected copying magnification; and a length set to correspond to the width size of the roll paper detected by the detection means; a timer means that starts counting when the image signal rises; and when the timer means finishes counting, it determines the state of the image signal and determines whether to cut the roll paper to a horizontal standard size or a vertical standard size. Since the discriminating means is provided with a cutting means for cutting the roll paper using a cut signal based on the discrimination result of the discriminating means, the discriminating means automatically determines the cut length of the roll paper based on the image signal and the timer means. It is possible to determine whether the cut length is a horizontal size or a vertical size, and there is no need for the operator to input the cut length into the device each time, which prevents input errors and improves usability.

[Brief explanation of the drawing]

The drawings show an embodiment of the image forming apparatus according to the present invention, in which Fig. 1 is a schematic diagram of the entire apparatus, Fig. 2 is a plan view of the operation panel, Fig. 3 is a block diagram of the control circuit, and Fig. 4. Or the 16th a l! Figure 16b is a flowchart showing the control procedure. (1)... Copying machine main body, (2)... Photosensitive drum,
(2o)...Optical system, (31), (33)...Roll paper, (40)...Timing roller, (41)...
... Cutter, (50) ... Automatic document circulation conveyance device (R
ADF), (PS9)...Document detection sensor.

Claims (1)

[Claims] 1. In an image forming apparatus capable of forming an image with variable magnification on a roll paper loaded in a paper feed unit, there is provided a detection means for detecting the width size of the roll paper loaded in the paper feed unit; , generating means for generating an image signal indicating an image length determined by the length of the original in the image scanning direction and the selected copying magnification; and setting the roll paper to a length corresponding to the width size of the roll paper detected by the detection means. a timer means that starts counting when the image signal rises; and when the timer means finishes counting, it determines the state of the image signal and cuts the roll paper in either a horizontal size or a vertical size. An image forming apparatus comprising: a discriminating means for discriminating; and a cutting means for cutting a roll paper using a cut signal based on the discriminating result of the discriminating means.