JPS63253958A - Image forming device - Google Patents

Abstract

PURPOSE:To eliminate the need of input of a cut size and a copy size by an operator, by discriminating automatically the cut length of roll paper to be a fixed horizontal size or a fixed vertical size. CONSTITUTION:Roll paper 31, 33 are cut to a fixed horizontal size or a fixed vertical size with a cutter 41, based on a cut signal. In this case, whether said paper is cut to the fixed horizontal size or cut to the fixed vertical size is discriminated automatically by a discriminating means, based on an image signal for showing the image length determined by the image scanning direction length of an original and the selected copying magnification, and the first timer means. Also, a timer means for a horizontal cut use or vertical cut use is set. In such a way, it becomes unnecessary to input the cut length one by one to the device by an operator.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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 to be formed.

Conventional technology and its five problems Generally, in copying machines that form original images on roll paper loaded in the paper feed section, there are two methods for cutting the roll paper: a synchro cut method and a standard size cut method. There is.

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 being the width direction and vertical cutting with the short side being 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 in some cases, which is not desirable in terms of usability.

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; and (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; a first timer means that starts counting when the first timer means rises; (V) timer means for horizontal cutting and vertical cutting that are set based on the determination result of the determining means; and (vi) transporting the roll paper to the image forming section. (vi) timer means for horizontal cutting that is set to a length corresponding to the horizontal standard size if the timing signal rises before the determination by the determining means ends; ) a first cutting means that cuts the roll paper when the timer means for each cut ends the count; and (ix) the determination by the determination means ends when the timer means for horizontal cutting ends the count. (x) if the timer means for vertical cut correction is set, the first cut means operates; and a second cutting means that cuts the roll paper when the timer means for vertical cut correction finishes counting.

Function In the above configuration, the cut length of the roll paper, that is, whether to cut to a horizontal standard size or to a vertical standard size, is determined by the image length of the original in the image scanning direction and the selected copy magnification. The determination means automatically makes a determination based on the image signal indicating the cut and the first timer means, and the timer means for horizontal cutting or vertical cutting is set. Then, when the roll paper is conveyed to the image forming section, that is, when the timing signal is rising but the cut length has not been determined, the timer means for horizontal cutting is set once, and each of these cuts is When the timer means finishes counting, the first cutting means operates to automatically cut the roll paper into a standard size according to the image length. on the other hand,
If the determination by the determining means has not ended even after the timer means for horizontal cutting has finished, the timer means for correcting vertical cutting is set to a length corresponding to the vertical standard size. In this case, the operation of the first cutting means is prohibited, and when the timer means for vertical cut correction finishes counting, the second cutting means operates to cut the roll paper into a vertical size. Therefore, the operator does not need to input the cut length into the device each time, and if the cut size cannot yet be determined at the timing of cutting at the horizontal standard size due to trouble in the control system, etc., the cut length will be cut to the vertical standard size, There is no risk that the sized image will be cut to the horizontal standard size.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an image forming apparatus according to the present invention will be described below with reference to the accompanying drawings. This embodiment includes a toner image transfer type copying machine main 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), Mirak 26
), which forms an image of the document conveyed on the document slit glass (27) on the photosensitive drum (2) at the RADF (50) described below.Lens (25)
, the mirror (26) can be moved in the optical axis direction by a motor (M2) according to the copying magnification.

For each copy, the photoreceptor drum (2) is erased from residual charge by a main eraser lamp (3), given a predetermined charge by a charger (4), and then cleaned by an optical system (20). An image is formed to form an electrostatic latent image.This electrostatic latent image is converted 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 charger (7), and the photoreceptor 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 (Ml).

The top picture paper section (30) and the bottom picture paper section (32) each have three sets of microswitches (SWI) to (SW3),
(S$J4) ~ (SW6) have been installed. These switches are turned on and off by protrusions provided for each width size when 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.

The following [Table 1] shows the switch (Sν1) of the upper picture paper section (30).
) to (SW3) are shown below. This [Table 1
], the on state of the switch is represented as "rO" and the off state is represented as 11", and when all the switches are off, it means that the roll paper is not set in the overprint paper section (30). In addition, the switches (Sen4) ~ (
SW6) also performs similar detection.

[Table 11] Various sensors are installed inside the copying machine main body (1). The sensors (PSl) and (PS2) are for detecting cut paper inserted into the manual paper feed section (34).

(PS3), (PS4) are the upper and lower paper feed sections (3).
o), (32) loaded roll paper (31), (
33). Sensor (PS5)
is just before the timing roller (40), and the sensor (PS6
), (PS7) are discharge rollers (44), (PS7), respectively.
Immediately after step 47), the arrival and passing of the paper 9 is detected. Also,
These sensors are also used to detect paper jams and to control other operations of the copying machine assembly 1).

[Automatic document circulation feeder (RADF)] 1st r: I! J
The RADF (50) consists of a document table (51), document transport rollers (52) to (57), and document ejection tray (60).
) and a document transport motor (M3).

Each conveyance roller (52) to (57) is a driven roller (52a), (53a), (53b) to (57a), respectively.
A guide member for conveying the original is appropriately installed around the guide member. In addition, a conveyance roller (54),
<55> is a switching claw (6
1), (63) and guide plates (62), (64), and the conveyance 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 advanced 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) and (53) are retracted, the transfer rollers (53) and (56) circulate.

On the other hand, when the switching claw (65) is retracted from the conveyance path, the original is transferred from the conveyance roller (57) to the ejection tray (60).
is discharged to the top.

Each of the above conveyance rollers (52) to (57) is rotated by the document conveyance motor (M3), and the conveyance speed is set at (V).
), the copying magnification (n) is controlled to (V/n). The conveyance speed (V) at the time of notification is the same as that of the photoreceptor drum (
2) is equal to the peripheral speed and paper conveyance speed.

In addition, each sensor (PS8) to (PSI) is installed in the document transport path.
I) 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 to be 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, the manuscript is RADF (50)
When the photoreceptor is completely conveyed into the interior of the photoreceptor drum (27) and passes over the glass (27), it is irradiated with light from the exposure lamp (21), and the reflected light is imaged on the photoreceptor drum (2). At the same time, the length of the original can be detected by a combination of various sensors and timers, and the switching claws (61) and (63) operate according to the length of the original, so that the original passes through the shortest circulating conveyance path. When the leading edge of the document is detected by the sensor (PSIO), it is determined whether copying has been completed or not. If the circulation for one fold has not yet been completed, the switching claw (65) is operated to transfer the document to the transport roller. When the circulation for each six copies is completed in (53), the document is directly ejected onto the ejection tray (60) through the conveyance roller (57), and the trailing edge is detected by the sensor (Psi 1
'), 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 to stop the document transport operation of RADF (50>). <101) to (110) are numeric keys for setting the number of copies, etc., and (111) is to cancel multi-copying midway. A clear/stop key that has the role of a stop key for clearing the numbers, and a clear/stop key for clearing the numbers. (112) is an interrupt key to execute interrupt copying, (113) and <114) are magnification up and down keys that increase and decrease the copy magnification in steps, (115) and (116) are exposure amounts Exposure Up key and Exposure Down key to increase or decrease the exposure in steps. (117) is a select key for the top picture paper section (3o) or the bottom picture paper section (32). (118) is expanded.

Copy magnification select key with presets of 2 steps of normal magnification and reduction. (119) is a zoom magnification select key for selecting two types of zoom magnification arbitrarily preset by the user. (120) is the zoom magnification input key + for inputting the zoom magnification, and (121) is the synchronized cut designation key for cutting the roll paper in synchronization with the length of the original.

The operation panel further includes a display section (140) including a display LED and a fluorescent display tube, which will be described below.

(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) is selected, and the paper feed section select key (-1
17) is rotated every time the ON operation is performed.

(132) and (133) are roll paper width size display sections, and each paper feed section (30) and (32) 4. : The setting digits are displayed based on the signals from the switches (Swl) to (SW6). (124) to (127) are copy magnification selection display LEDs, and the copy magnification selection key (118)
) is rotated each time the switch is turned on. (12
8) and (129) are zoom magnification selection display LEDs, which are rotated each time the zoom magnification selection key (119) is turned on. (130), (13
1) is a synchro cut selection display LED for the upper and lower roll paper, and the synchro cut designation key (121)
Rotates each time the switch 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 4-digit display segment that displays the selected copy magnification. (143> is a pictorial display instructing the service man to complete the job. (144) is a step display of the exposure amount.

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

(14B) is displayed during interrupt copying. (149) is temperature control,
Weight display when moving the lens (25), etc.

[Control Circuit] Figure 3 shows a microprocessor (hereinafter referred to as CPU) (201) that controls the main body of the copying machine (1), and an 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)
~(208). 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 terminals. IC(206)～(
20g> is used as an output IC, and the control port connects to the CPU (
201) is not connected.

In addition to various parts, the output terminal is connected to a display section (TAO) using a fluorescent display tube and an LED matrix (209) consisting of LEDs (122) to (131), and a CPU (
201) via a decoder (211). Random access memory (hereinafter referred to as R
AM) (212) is connected to the CPU (201) and has memory backup by a battery.

Further, the CPU (201) transmits 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) control circuit for the document transport motor (M3) (
216), a lens (25), and a control circuit (217) for a motor (Ml) that moves the mirror (26) according to the selected copy magnification. Also,
Each sensor (PS8) installed on RAD F (50) ~ (
On and off signals from PSII) are input, and -1
Switching claw <61).

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

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

Figure 4 shows the CPU (201) that controls the copying machine main body (1).
The main routine is shown below.

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), the 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, each subroutine shown in steps (S3> to (S5)) is 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 various timer values determine the end of counting depending on how many times this one routine has been repeated.

Also, if an interrupt request is received from the CPU (215) while various processes are being executed, the CPU (215)
).

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 original insertion signal is "1."
When detected in S8), it is set to "r'1" [see step (5221)]. This original insertion signal is 11.”
When the CPU (215) is able to send the information that has been set to 1, the copy start flag is set to 1 in step (511).
1”.

Next, in step (512), the copy start flag is set to rl,
If it is set to '1', the main motor (Ml>, developing motor, etc. is turned on in step (513), and the charging charger (4) and transfer charger (
7) etc., reset the copy start flag to 0, and set the timers (IA) and (TB). Then, in step (514>), check whether the overprint paper section (30) has been selected. If YES, the clutch of the top picture paper roller (37) is turned on in step (515), and if NO, the clutch of the bottom picture paper roller (38) is turned on. Roll paper (31〉 or (3)
3) is fed toward the timing roller (40).

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

Further, when the judgment end timing of the timer (IB) is confirmed in step (519), the scan signal is set to rl in step (520). The scan signal is
As explained in step (5224) of FIG. 16a, this is a signal for transporting the document from the position of the sensor (PS9>) toward the position of light irradiation by the exposure lamp (21).

Next, in step (521), it is determined whether the timing signal is 11''. Timing signal is photosensitive drum (2)
This is to synchronize the leading edge of the original image formed above and the leading edge of the paper at the transfer position, and the following step (5232)
It is set to 11. This timing signal is 11''
When the timing roller (4) is sent from the CPU (215) in step (522),
0) 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 setting to "0.", and turn off the timing roller (40).
> disengage the clutch.

Next, in step (525), it is determined whether the return signal is "rl". The return signal is sent to the sensor (
When the return signal is detected by the CPU (PSIO), it is set to 1 (see step (5239)).Therefore, when the CPU (215) transmits that the return signal is set to 1, In step (526), it is determined whether the multi-copy is completed. If the multi-copy is not completed, the copy start flag is set to "1" in step (529) and preparations are made to start the copy operation again.If the multi-copy is completed, that is, copies are made for the number of copies set. When the operation is completed, the sensor (
PS6) is 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 a timer (TC) is set. Further, in step (530), a timer (T
When the judgment end timing in C) is confirmed, 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 is ended.

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

First, in step (540), it is determined whether the original image signal is 11''. The original image signal is set to rl when the leading edge of the original inserted into the RADF (50) reaches the light irradiation position on the glass (27) [step (522)
9)]. When the CPU (215) transmits that this original image signal is set to "1.", the paper feed unit (3o) or (3) selected in step (541) is
2) Roll paper (31) or (33) completely 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 Ronil paper.

Next, in step (542), it is determined whether the timing signal is "IJ", that is, whether it is the timing to turn on the timing roller (40) and convey the roll paper to the transfer position.The timing signal is "0". If step (547
), and if it is set to '1', step (543
) sets the timing flag to rl. Lead,
In step (544), it is determined whether the size determination end flag is rl. The size determination completion flag is set to 11 when the determination of the size to cut the roll paper is completed [see step (558)]. Therefore, if the flag has been set to 1, the process moves to step (547). , rg,
If so, the paper source (30
) or (32), a timer (T2) corresponding to the width size of the roll paper (31) or (33) is set. This timer (T2) is set to the time required to cut the roll paper into a horizontal standard size. Then, in step (546), the timer T2 set flag is set to 11''.

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 10''. The original image signal is reset to "rO" 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 is reset to rO' when the rear edge of the original passes the light irradiation position on the glass (27). By conveying the document at a speed of passes, and the original image signal becomes “0”.
”, the timer T2 set flag is set to “o.” in step (550).

Determine whether or not. If the timer T2 set flag is set to "11", the size determination end flag is set to "1" in step (558). Also, if the timer T2 set flag is 10'', it corresponds to 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 timer (T3). This timer (T3
) is set to the time to cut the roll paper into horizontal size.

On the other hand, if it is determined that the original is still passing through the light irradiation position and the original image signal is still set to ``rl'' in step (549>), the timer T2 set flag is set to ``rl'' in step (553). Determine whether or not.Timer T
If the 2-set flag is set to rl, 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) set in the paper roll. 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 0°, and the timer T4 set flag is set to 11. In step (558), the size determination end flag is set to 11. On the other hand, if the timer T2 set flag is "0.", the paper feed unit (30) selected in step (556)
Alternatively, set a timer (T5) corresponding to the width size of the roll paper (31) or (33) that has run out in (32). This timer (T5) is 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 r.
Set to l.

That is, in the cut size determination routine described above, the state of the original image signal is determined when the timer (step 1) finishes counting [see steps (548) and (549)], and the original image signal is reset to 10. For example, it is determined to cut to a horizontal standard size, and if rl remains set, it is determined to be cut to a vertical size. in particular,! If the original image signal has been reset to "0" and the timing signal has already risen to "11" at this time, the timer (T2) for cutting to the horizontal standard size set in step (545) is activated. Keep it set. Further, if the timing signal has not risen to I''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 "11", that is, the timer (
If T2) is set, in step (554) this timer (T2) is corrected and a timer (step 4) for cutting to a vertical size is set. Also, if the timing signal has not risen to "1", step (S
56) to cut to vertical size (T5)
).

After determining the size to be cut as described above, it is determined in step <559) whether or not the timing flag is 11. When started, first, in step (560), it is determined whether or not the timer T2 set flag is 11'', and if it is set to ``1'', step (56
1), the timer (T2) is subtracted, step (562) confirms that the timer (T2) has finished counting, and step (562a) determines whether the size determination end flag is "1". If size determination has already been completed, step (
563), the cutter (41) is turned on, the timer T2 set flag is reset to 1"0", and the timing flag and size determination end flag are reset to 10J.

In this way, the roll paper is cut into a predetermined horizontal size.

On the other hand, when the timer (T2) has finished counting, if the size determination has not yet been completed, [step (562)
NO3 in a), tie 7 in step (576) (Tl
) and set the timer T2 set flag to r.
Reset to "O". Next, in step (577), a timer (T6) for vertical output correction corresponding to the width size of the roll paper (31) or (33) is set, and step (577) is performed.
78) sets the timer T6 set flag to 11''.

Also, if the timers (T3), (r4), and (T5) are set, step (564)
, (568).

In (572), it is determined whether each timer set flag is 11" or not, and the following routines set to 1 are executed. That is, each step (565), (56
9).

(573) and timer (T3), (T4), (T5)
Subtract each step (566), (570), (
574), check that the timers (T3), (T4), and (T5) have finished counting, and then start each step (574).
67), (571), (575) and cutter (41)
is turned on, and the respective timer set flags are reset to "10", and the timing flag and size determination end flag are reset to "0". In this way, the roll paper is cut into a predetermined horizontal size or vertical size.

If the timer (T6) for vertical cut correction is set in step (577), step <579
), if it is determined that the timer T6 set flag is "IJ", the timer (T6) is subtracted in step (580). Then, when it is confirmed in step (581) that the timer (T6) has finished counting, step At (582), the cutter (41) is turned on, the timer T6 set flag is reset to 10'', and the timing flag is also set.

Reset the size determination end flag to 10.

That is, in this embodiment, a timer (T2) for horizontal cutting.

(T3), timer for vertical cutting (T4), (T5)
When the count ends, each cutter (41) is turned on to cut the roll paper. However, the CPU
(201).

(215) Due to a problem such as poor communication between steps (step (562) (562a) See ko. In such a case, a new timer (T6) for vertical cut correction should be set.
is set (see step (577)), and the cutter (41) is prohibited from being turned on in step (563). Then, when the timer (T6) finishes counting, the cutter (41) is turned on [step <582]
], this prevents the inconvenience that an image that should originally be cut at a regular vertical size is cut at a regular horizontal size.

FIG. 7 shows a key processing subroutine executed in step (s5>) of the main routine.

In this subroutine, step (5100) processes the magnification up key (113), step (5101)
) to process the magnification down key (114), step (51
02) 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 display LEDs (124) to (129) are turned off in step (5112), and 1/1000 is added to the magnification. This is repeated every time the magnification up key (113) is pressed, and as a result, if it is determined in step (5113) that the magnification exceeds the maximum setting value of 1.420, the magnification is increased to 1.420 in step (5114). Correct to.

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

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), and change the magnification to 171000 in step (5122).
Subtract. This is repeated every time the magnification down key (114) is pressed, resulting in step <5123).
If it is determined that the magnification has fallen below o, soo, the magnification is corrected to 0.500 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) has been completely turned off, is turned off in step (5131). If so, the display (148) is lit in step (5132), the copy mode at that time is memorized in RAM (212), and if the 0 display (148) that allows interrupts is lit, the process is executed in step (5133). ) to turn off the display (148) and return to copy mode.

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 selection key (117) is on, it is determined in step (5141) whether or not the overprint paper section (30) has been completely 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 underprint paper section (32) is selected, the overprint paper section (30) is selected in step (5143>).Then, the paper feed section (30) or (32) selected in step (5144) is selected. ) is displayed on the display section (132) or (133).

FIG. 12 shows a subroutine for processing step exposure keys (115) 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). do.

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 document stop key (100) executed in step (5105).

First, in step (5160), the original stop key (10
0) is confirmed to be on-edge, 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)
Reset the copy start flag and scan signal to "rO" and reset the timers (TA), (TB), and (TC).

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

When the CPU (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.Next, step (5201)
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 at the step (520
0).

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.

Furthermore, when an interrupt request is received from the CPU (201) while various processes are being executed, the CPU (2 (
Perform data communication with H).

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 a subroutine for document conveyance control 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) sets the original insertion signal to 1'' and turns on the original transport motor (M3). Now the manuscript is in RADF (
50). Next, step (5222)
It is determined whether the sensor (PS9) is on-edge or not, and if it is on-edge, that is, the leading edge of the document is on the sensor (PS9).
If it reaches ", the document transport motor (M3) is turned off in step (5223), and the return signal and document insertion signal are set to "
0”.

Next, in step (5234), it is determined whether the scan signal is "1. If rl", then [step (520')
Reference], in step (5225), the document transport motor (M3
> Turn on. In this case, the motor (M3) is controlled at a speed according to the copy magnification, and the document is transported from the position of the sensor (PS9). At the same time, step (5226)
Set the timer (TD) and (TE) with . 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.
Similarly, the timer (IE) is set to a time at which the timing for turning on the timing roller (40) is issued, taking into account 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 11'' in step (5229).

Subsequently, in step (5230), the timer (IE) is subtracted, and when it is confirmed in step (5231) that the timer (TE) 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, and if it is off-edge, step (5233) is performed.
5234), the timer (TF) is set and the timing signal is reset to 10''. 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 10''.

Next, in step (5238) it is determined whether the sensor (PSIO> is on-edge or not. If it is on-edge, the return signal is set to 11" in step (5239), and in step (5240) it is determined whether the copy is completed or not. If the copy is completed, the switching claw (6
The original is ejected with 5) turned off. On the other hand, if the copying is not completed, the switching claw (65) is turned on in step (5242) 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
) is subtracted, and when it is confirmed in step (5246) that the timer (TG) has finished counting, in step (5247) the original conveyance motor (M3) is turned off and the return signal is reset to "0."

On the other hand, in step (5248), the document stop position is rl.
, and if rl, [step (516
1)], and in step (5249) the document transport motor (
M3) is turned off. At the same time, in step (5250), the timing signal and return signal 11 are reset to 0 degrees, and the timer (ID), (TE), (IF)
, (IG> is reset, and control of RADF (50) is stopped.

[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 may be used 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.

Effects of the Invention As is clear from the above explanation, according to the present invention, a detection means for detecting the width size of the roll paper loaded in the paper feed section;
A 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 a length corresponding to the width of the roll paper detected by the detection means. , a first timer means that starts counting when the image signal rises, and when the first timer means finishes counting, the state of the image signal is determined and the roll paper is set to a horizontal size or a vertical size. Discrimination means for determining whether to cut, timer means for horizontal cutting and vertical cutting that are set based on the determination result of this discrimination means, and means for generating a timing signal for conveying the roll paper to the image forming section. If the timing signal rises before the determination by the determining means ends, the horizontal cut timer means is set to a length corresponding to the horizontal standard size, and the counts of the respective cut timer means are set to a length corresponding to the horizontal standard size. Since it is equipped with a first cutting means that cuts the roll paper when the roll paper is finished, the cut length of the roll paper can be automatically determined as horizontal size or vertical size, and the operator can set the cut length to the machine one by one. No need to input. Moreover, if the discrimination by the discrimination means has not been completed when the count of the timer means for horizontal cut ends, the timer means for vertical cut correction is set to a length corresponding to the vertical standard size; When the timer means for vertical cutting is set, the operation of the first cutting means is prohibited, and the second cutting means is provided for cutting the roll paper when the timer means for vertical cutting correction ends counting. , it is possible to eliminate the problem that an image that should originally be cut in vertical size is cut in horizontal size.

[Brief explanation of drawings]

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. 16a to 16b are flowcharts showing the control procedure. (1)... Copying machine main body, (2>... Photosensitive drum,
(20)...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 first timer means that starts counting when the image signal rises; and when the first timer means finishes counting, it determines the state of the image signal and adjusts the roll paper to a horizontal size or a vertical size. a discriminating means for discriminating whether to cut by the above-mentioned discriminating means; timer means for horizontal cutting and vertical cutting that are set based on the discrimination result of the discriminating means; and generation of a timing signal for conveying the roll paper to the image forming section. means, a timer means for horizontal cutting that is set to a length corresponding to the horizontal size if the timing signal rises before the determination by the determining means is completed; and timer means for each of the cuts. If the first cutting means cuts the roll paper at the end of counting and the timer means for horizontal cutting has not completed the determination by the determining means, the length corresponding to the vertical size is cut. When the timer means for vertical cut correction is set, the operation of the first cutting means is prohibited, and when the timer means for vertical cut correction ends counting, the timer means for vertical cut correction is set. An image forming apparatus comprising: second cutting means for cutting roll paper.