JPH02213865A - Paper refeeding device - Google Patents

Abstract

PURPOSE:To easily and directly eject paper left on a belt to the outside of a device by switching a switching means which selectively ejects the paper to the outside of the per refeeding device and driving the belt in a rewinding direction when a forcible ejection indication means is operated. CONSTITUTION:The switching means 120 which is disposed at the branch point of a path for housing the paper in a paper housing part 200 and a path 40 for feeding the paper again from the housing part 200 or in the vicinity of it and which selectively ejects the paper to the outside of the paper refeeding device 100 is provided. It is desired that the switching means 120 is a guide cover which can open and close the branch point of the housing path and the paper refeeding path 40 or the vicinity of it. Then, when the switching means 120 is switched to a paper ejecting position and the indication means is operated, the belt 240 is driven in the rewinding direction. At this time, the paper left in the housing part 200 is drawn from the belt 240. Thus, the paper left in the housing part 200 by being taken up to the belt 240 because a mode is set inadvertently or the paper refeeding operation is forgotten is easily and quickly ejected to the outside of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to a paper refeeding device, particularly a single-sided copied sheet discharged from the main body of an image forming device such as a copying machine or a laser beam printer.
The present invention relates to a paper refeeding device that once stores paper in a paper storage unit for double-sided/composite copying and then feeds the paper from the paper storage unit to the main body of an image forming apparatus.

Conventional Technology and Problems Conventionally, this type of paper refeeding device feeds sheets one by one from a backfill tray that sequentially accommodates sheets of single-sided copied paper stacked in a flat state in a tray provided in a substantially horizontal or vertical direction. It was configured as follows:

However, the paper is often heated and curled by the fixing device in the image forming device, so it is necessary to guide the paper one sheet at a time into the tray, or to store the paper one by one.
It is difficult to separate the sheets one by one and refeed them, and there is a risk of problems such as paper jams and double feeding.

Therefore, US Pat.
No. 8-188260, No. 59-39561 (
Corresponding U.S. Application, Patent Section 4.496.1.42)
As described in , a bell I is wound around one or two wooden shafts and is set so that it can be rewound. A paper winding type refeeding device that feeds out paper has been proposed.According to this, it is possible to reliably store and refeed paper sheet by sheet.However, the problem here is that the operator's This process is performed when unnecessary paper is inadvertently stored in the belt, or when the previous paper is left in the belt when copying is started.Such inconveniences occur when If the operator forgets to remove the paper from the paper refeeding device, ■ If the operator accidentally selects double-sided 7-print copying and executes the copying process to the first side, ■ If the machine is turned off while the paper is being loaded. With the paper winding method using a belt, it is practically impossible for an operator to manually remove the paper from the bell I.Moreover, if the paper is ejected through the image forming apparatus main body, If so, you will be spending extra time.

SUMMARY OF THE INVENTION An object of the present invention is to easily and quickly remove paper that has been wound up on a belt and left in a storage section due to incorrect mode settings or forgetting to refeed paper in a paper winding type paper refeeding device. The objective is to make it possible to eject it outside the aircraft.

Means and Function for Achieving the Object In order to achieve the above object, the paper refeeding device according to the present invention has the following features:
(b) a means for instructing an operation to cause paper to be ejected; a switching means for ejecting the paper out of the paper refeeding device;
c) control means for driving the belt in a rewinding direction when the switching means is switched and the instruction means is operated;

Preferably, the switching means is a guide cover that can be opened and closed at or near a branch point between the storage path and the paper refeed path. The switching means is switched to the paper ejection position,
When the instruction means is operated, the belt is driven in the rewinding direction, and the paper remaining in the storage section at that time is fed out from the belt and is directly delivered to the outside of the paper refeeding device without passing through the main body of the image forming device. It can be discharged to.

It is preferable that the guide cover functions as a paper discharge tray when discharging paper, but it may also function simply as an opening/closing member.

[Margin below] Hereinafter, embodiments of a paper refeeding device according to the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the paper refeed unit l-<100>, which is an embodiment of the present invention, is located on the right side of the copying machine main body (1) where the υ1 paper section and the refeed paper receiving section are completely formed. A sorter (400) is also removably attached to the right side of the paper refeed unit 100).

[Schematic configuration and operation of copying machine main body] The copying machine main body (1) includes a known copying mechanism and is mounted on a desk (90). Inside, a photoconductor drum 10> is provided approximately in the center so as to be rotatable in the direction of arrow (a), and around it are a main eraser lamp (11), a sub-charging chip H-G V (12), and a sub-laser lamp. (13), main charger <14
), a magnetic brush type developing device (15), a transfer charge (16), a paper separation unit (17), and a cleaning device (18).
, <10) are sensitized and charged by passing through the eraser lamps (11>, (13) and the charging chips (12), (14), and then the arrows (
b) An electrostatic latent image is formed on the surface by image exposure from the direction.

Copy paper can be fed using two paper feeders (upper and lower) (30), (
32). In this example, A4 size horizontal paper is placed in the upper cassette (30), and paper in the lower cassette (30) is placed horizontally.
32) contains sheets of B5 size horizontally arranged sheets. The size of the copy paper stored in each paper cassette (30), (32) is as follows:
32) is connected to the sensor (PSI) provided on the copying machine main body (1> side),
(PS2) and is identified based on a pre-assigned code. At the same time, the sensor (Psi)
, (PS2) also detects the presence or absence of paper in the cassettes (30), (32).

The paper in the upper cassette h (30) is fed by the paper feed roller (31), and the paper in the lower cassette 32> is fed by the paper feed roller (33).
), and is guided to the timing roller (35) by a guide means (not shown), where it is temporarily stopped. The copy paper once stopped is sent to the transfer section in synchronization with the image formed on the photosensitive drum (10). Next, the toner image is transferred by discharge from the transfer charge + (16), and separated from the surface of the photoreceptor drum (10) by AC discharge from the separation charger (17). After that, the fixing device (
37>, where the image is fixed, and then the discharge roller (37)
8), from (39) to the paper refeeding unit (100
) is passed to. Note that the photosensitive drum (10) after transfer is cleaned by a cleaning device (18) and an eraser lamp (11).
The toner and charge remaining on the surface are removed by the process, and the surface is prepared for the next copying process.

On the other hand, at the bottom of the copying machine main body (1), a timing roller (35) is used to feed the paper re-fed from the paper re-feed unit (OO).
A refeed path (40) is provided, which is comprised of rollers (41>, (42), etc.) for conveying the paper to the paper sheet.

The paper is fed from the paper refeed unit (100) to this path (4) with the image side already copied facing up during double-sided copying, and with the front and back sides reversed and facing down during composite copying.
0), is again supplied to the timing roller (35), and reaches the aforementioned transfer section.

By the way, the main motor (Ml) is connected to the paper feed roller (31
), (33), timing roller (35), conveyor belt (36), fixing device 37), discharge roller (38),
(39) Also drives the paper transport system of the paper refeed path (40) and the paper transport system in the paper refeed unit <100> described below. Further, the developing motor (M2) drives the image forming section including the photosensitive drum (10) and the developing device (15).

[Configuration and operation of paper refeeding unit] This paper refeeding unit (100), as shown in FIG.
A paper feed switching unit (120) receives paper ejected from the copying machine main body (1) and switches the paper feed format as appropriate according to the copy mode, and temporarily stores paper that has been copied on one side during duplex/composite copying. Rolling paper storage section for <2
00>, an intermediate conveyance unit (180) that feeds the paper to the paper storage unit (200), and a refeed unit that feeds the paper stored in the paper storage unit (200) one by one to the paper refeed path (40). It consists of a paper section (320). A micro switch (
MS) is detected by the on/off signal.

The paper refeeding unit (100) also includes a paper output tray (1
75) or a sorter (400) can be selectively installed. FIG. 2 shows a state in which a paper discharge tray (175) is installed, and FIG. 1 shows a state in which a sorter (400) is installed. The sorter (400) is well-known in terms of configuration and function, and is composed of a plurality of bins (410) installed one above the other in the vertical direction.
). When using this sorter (400), the top bin (410>) functions as a paper discharge tray during non-sorting.

[Paper passing switching unit] The paper passing switching unit (120) includes a guide plate (121), <
122).

<123), paper feeding direction switching claw (125), (130
), discharge rollers (135), (136), etc. The switching claw (125) has a guide surface (125 g) that guides the paper to the ejection rollers (135), (136) (1111), and the receiving part has an arcuate shape that guides the loaded paper toward the intermediate conveyance rollers (190) and (191). a guide surface (125b), a paper ejection roller (135),
From the (136) side, the intermediate conveyance roller (190), (19
1) It has an arc-shaped guide surface (125c) that guides it to the side. A resin flexible film (129) is attached to the third guide surface (125c) to serve as a paper guide. The tip of this flexible film (129) extends to contact with or near the guide plate (123), and the sheet transported from the left in FIG.
A) 'y5 direction], but has the function of guiding the paper from the right side to the guide surface (125c) of the switching claw (125).

The switching claw (125) is attached to a support shaft (
126) as a fulcrum, and as shown in FIGS. 6 and 7, the support shaft (126) is attached to the front frame <101
) via an arm (127) to the plunger of a solenoid (SLI). Switching claw (125
) is set to the two-dot chain line position in FIG. 2 by the action of a return spring (not shown) when the solenoid (SLI) is turned off, and is set to the solid line position when the solenoid (SLI) is turned on.

Another switching claw (130) has a guide surface (130a) that guides the paper to the paper output tray (175) or the sorter (400), and an arcuate guide surface that guides the paper toward the right side of the unit (100). (130b), and a frame (101) with the support shaft (131) as a fulcrum;
(111) is rotatably mounted between the two. This support shaft (
131) is connected to the switching pawl (125) and the plunger of a solenoid (SL2) provided on the front frame (101) via an arm (132), as similarly shown in FIGS. 6 and 7. There is. When the solenoid (SL2) is turned off, the switching pawl (130) is set to the dotted chain line position in Figure 2 by the action of a return spring (not shown), and when the solenoid (SL2) is turned on, it is set to the solid line position. .

Moreover, this switching claw (130) is connected to the frame (101>,
(111), and is detachable from the sorter (4).
00) is removed if not connected.

The paper discharge tray (175) is fully supported at one end by a support plate 76). The trailing edge of the paper discharged from the discharge rollers (135) and <136) is regulated and aligned by a regulation plate (177). Note that when this paper output tray (175) is attached, the switching claw (130) is connected to the unit (1
00) and when the sorter (400) is attached, the paper discharge tray (175) and support plate (176) are removed and a switching claw (130) is attached in their place.

On the other hand, a photo sensor (SEL>
is attached via a bracket (133).

This sensor (SEI) is connected to the actuator (134)
protrudes into the conveyance path formed by the guide surface (125a) of the switching claw (125) and the guide plate (123), and detects the paper passing through the path.

The upper ejection roller (135) is coaxially equipped with a tension roller (135a) of a slightly larger diameter (see Fig. 5), and is used not only to eject the paper but also to switch back the paper during composite copying. It is possible to drive forward and reverse rotation. here,
The drive mechanism will be explained with reference to FIGS. 4 and 5.

A bracket (141) and a timing pulley (142a) are attached to the support shaft (140) fixed to the back frame (111).
), a gear (142b) is rotatably mounted, and a pulley (
142a) and the gear (142b) are rotatable under one weight. The bracket (141) has a gear (144),
(145) and (146) are each rotatably mounted, the gear (144) meshes with the gear (142b), and the gear (145) meshes with the gears (142b) and (146). Support shaft (137) of upper discharge roller (135)
A gear (138) is fixed to the end of the gear.

The bracket (141) is biased in the direction of arrow (c) by a coil spring (147), and is connected via a lever (148) to the plunger of a solenoid (SL3) fixed to the back frame (111). It's broken. When the solenoid (SL3) is turned off, the bracket (1
41) is the arrow (C) due to the action of the coil spring (147).
The gear (146) meshes with the gear (138).

When the solenoid (SL3) is turned on, the bracket (14
1) rotates in the opposite direction to the arrow (C), and the gear (144)
meshes with gear <138) instead of gear (146).

A timing belt (151) is stretched between the timing pulley (142a) and other timing pulleys (150a) and (195a). Timing Boo Rike 50
8) is the bracket (1) fixed to the back frame (111).
52) via a support shaft (153),
A gear (150b) rotatably provided integrally with the pulley (150a) meshes with a gear (155) rotatably attached to the tip of the bracket (152). moreover,
The gear (155) is connected to the lower discharge roller (
38> is meshed with a gear (50) fixed to the shaft end. Another timing pulley (195a) is fixed to the end of the support shaft (192) of the intermediate conveyance roller (190).

In the above configuration, the conveyance system of the sheet switching section (120) can be driven by the main motor (Ml) in the copying machine main body (1>. In other words, the main motor (Ml>) is driven by the gear (50).
is constantly driven to rotate in the direction of arrow (d), and this rotation is transmitted to gears (155), (150b), and driver 150a) to rotate the timing belt (151) in the direction of arrow <e). Furthermore, this rotation is caused by a solenoid (SL3
) is turned off, the pulley (142a) and gear (
142b).

(145>, (146) to the gear (138), upper discharge roller (135) and buckling roller (1
35a) in the direction of the arrow (f>). At this time, the gear (144) rotates idly. Meanwhile, the solenoid (S
When L3) is turned on, the gear (144) meshes with the gear (138) as the bracket (141) rotates, and the roller (135).

(135a) is reversed in the direction opposite to the arrow (f>). At this time, the gear (146) rotates idly.

Note that the lower discharge roller (136) is the same as the upper discharge roller (136).
35) and rotates as a result.

(Intermediate conveyance section) The intermediate conveyance section (180) includes a guide plate (181), a guide frame (182), an intermediate conveyance roller (190),
(191). Guide frame (1
82) is installed so as to be rotatable about the bottle (183) as a fulcrum, and is normally set at the position shown by the solid line in FIG. 2 under its own weight. When this guide frame <182> is rotated in the direction of the arrow (g>), the intermediate conveyance path is opened and jammed paper can be easily removed. The other roller (191) is driven to rotate in the direction [arrow (e) direction], and the other roller (191) is completely attached to the guide frame (182), and the roller (190)
It contacts and rotates as a result.

On the other hand, a photo sensor (SE2) is installed on the guide plate (181).
is attached via a bracket (185).

In this sensor (SE2), an actuator (186) protrudes into the intermediate conveyance path and detects a sheet passing through the path.

(Paper transport operation by the paper feed switching unit and intermediate transport unit) The second
When the paper sheet 1 is ejected after copying is completed, the solenoids (SLI) and (SL2) are turned off, and the switching claws (125) and (130) are held at the positions indicated by the dotted chain lines in FIG. Further, the solenoid (SL3) is also turned off, and the discharge rollers (135) and (136) are driven to rotate normally. When the sorter (400) is connected, the paper sent from the ejection rollers (38) and (39) of the copying machine main body (1) to the paper switching section (120) is transferred to the guide plate (123) and the switching claw. (125) guide surface (x2s
a>, while being guided by the guide surface (130a) of the switching claw (130), a conveying force is applied by the discharge rollers (135) and (136), and sent to the sorter (400).

When the paper output tray (175) is installed, the switching claw (130) is removed and the paper is placed on the output roller (175).
35) and (136) directly onto the paper output tray (175).

When the paper copied on the first side is ejected from the copying machine main body (1) in double-sided copy mode, the solenoid (SLI)
) is turned on, the switching claw (125) is set to the solid line position, and the paper is guided between the upper part of the guide plate (181) and the arcuate guide surface (125b) of the switching claw (125), and is conveyed intermediately. Laura (190).

(191) and is sent to a paper storage section (200), which will be described in detail below.

On the other hand, when the paper copied on the first side is retrieved from the copying machine main body (1) in composite copy mode, the solenoid (
SLI) is off, solenoid (SL2) is on,
The switching claw (125) is located at the two-dot chain line position, and the switching claw (130)
) is set to the solid line position. In addition, solenoid (SL)
3) is initially turned off, and the discharge roller (135),
(136) can be driven in normal rotation. The paper is transported in the direction of the arrow (A>) in the same way as in the single-sided copy mode, and the paper is transported in the direction of the arrow (A>), and the switching claw (
130) between the paper refeed unit (100) and the sorter (400).

On the other hand, when the paper ejection tray (175) is attached [at this time, the switching claw (130) is removed], the paper is guided onto the paper ejection tray (175).

Thereafter, the solenoid (SL3) is turned on after a predetermined time after the trailing edge of the paper is detected by the sensor (SEL), and the discharge rollers (135) and (136) are switched from normal rotation to reverse rotation. This predetermined time means that the trailing edge of the paper is
This is the time it takes to move from the detection point of the film (SEI) to an arbitrary position between the leading edge of the film (129) and the nip portion of the discharge rollers (135) and (136). Ejection roller (13
5).

(136) is driven in the reverse direction, the paper is conveyed in the opposite direction to the arrow (A) with the trailing edge leading up to that point, and the film (129) and the arcuate guide surface (125c ) while being guided by the intermediate conveyance roller (190
).

(191) and is fed into the storage section (200).

Next, when the leading edge of the following paper is detected by the sensor (SEI), the solenoid (SL3) is turned off and the discharge roller (135) is switched to normal rotation drive.

In both the double-sided copy mode and composite copy mode, when the number of copies per document set by the operator is stored in the storage section (200), each roller (135
), (190) are stopped, and the switching claw (125) is stopped.
) and (130) each return to the position indicated by the two-dot chain line.

(Paper storage section) The paper storage section (200) includes a guide cover (201),
A guide roller (210), pinch rollers (215) and (216) that follow it, a guide plate (219), and a switching claw (220).

(225), scraper (228), belt winding bobbin (230), belt unwinding bobbin (235)
), belt (240), idle roller (245),
(246), (247), etc. Basically, the paper conveyed downward from the intermediate conveyance rollers (190) and (191) is transferred to the guide roller (210).
, pinch rollers (215), <216) and feed it into the bobbin (230) below. At this time, the bobbin (2
30) is driven to rotate in the direction of the arrow (m), and the paper is wound onto the bobbin (230>) together with the belt (240).When refeeding paper, the upper bobbin (235) is driven to rotate in the direction of the arrow (m). The belt (240) is rewound onto the bobbin (235), and at the same time, the paper is peeled off by a scraper (228) = 19 and fed upwards, and then sent from the guide roller (210) that reverses in the direction of the arrow (j') to the paper refeed unit ( 320).

The switching claw (220) has bins (221) provided at both ends thereof.
As shown in FIG. 7, it is rotatably attached to a protrusion (202) provided on a guide cover (201) via the guide cover (201), and is biased in the direction of arrow (h) by a return spring (not shown).

Normally, the right end portion of this switching claw (220) in FIG. 2 abuts against the stepped portion (201a) of the guide cover (201) and is held at the position shown by the two-dot chain line. The spring force of the return spring that biases the switching claw (220) is set to be relatively weak, and the switching claw <220) is connected to the intermediate conveyance roller (190).

(191), the leading edge of the paper being conveyed is on the guide surface (
When it comes into contact with and presses 220a), it rotates to the solid line position, opens the conveyance path, and guides the leading edge of the paper to the nip between the guide roller (210) and the pinch roller (215).

The guide roller (210) is configured to be able to be switched between forward and reverse directions and to be driven intermittently in order to store the paper and take out the paper during re-feeding, and its drive mechanism will be described with reference to FIGS. 4 and 5. Note that this drive mechanism also operates at the same time as the paper refeeding section (3
20) registration roller (330).

(331) is also driven.

A timing pulley (195b) integrated with the timing pulley (195a) fixed to the spindle (192) of the intermediate conveyance roller (190), and a timing pulley attached to the back frame (111) via the spindle (263). (261
A timing belt (260) is stretched between the gear (260) and the timing pulley (2618), and the gear (261b), which can rotate as one unit with the timing pulley (2618), is connected to the gear (26) of the clutch (CLI).
4) is engaged. The clutch (CLI) is attached to the end of the support shaft (332) of the registration roller (330). The clutch gear (264) is always rotatable, and is further engaged with a gear (266b) attached to the back frame (111) via a support shaft <265>. Timing boot 1 that can be rotated integrally with this gear (266b)
bar 266a) and the support shaft (111) fixed to the back frame (111).
Timing boot 1 bar 2 rotatably attached to 270)
A timing belt (268) is fully tensioned on 71a). The support shaft (270) has a gear (271b),
The bracket (273) is rotatably attached and the gear (273)
71b) is rotatable as one unit with the pulley (2718>).

The bracket (273) has gears (274) and (275
) and (276) are respectively rotatably mounted, and the gear (275) meshes with the gears (27xb) and (276). A clutch (Cl3) is attached to the end of the support shaft (211) of the guide roller (210), and the clutch gear (280) is connected to the gear (2) of the bracket (273).
Either 74) or 276 can be engaged interchangeably. That is, the bracket (273) is biased in the direction of arrow (i) by the coil spring (277), and is also biased by the solenoid (SL5) fixed to the back frame (111).
) is connected to the plunger. Solenoid (SL5
) is completely off, the bracket (273) rotates in the direction of arrow (i) by the action of the coil spring (277), and the gear (276) engages with the clutch gear (280).

When the solenoid (SL5) turns on, the bracket (27
3) rotates in the opposite direction to the arrow (i), and the gear (274)
meshes with the clutch gear (280) instead of the gear (276).

When both of the clutches (CLI>, (Cl3) are in the OFF state, the rotation of the gears (264,) and <280> is directed to the registration roller shaft (332) and the guide roller shaft (
211), and when turned on, the transmission of the rotation is cut off.

In the above configuration, the timing belt (1, 51
) rotates the timing belt (260) in the direction of arrow (e) via the pulleys (195a) and (195b), and also rotates the timing belt (260) in the direction of arrow (e) through the pulleys (2618) and
b), clutch gear (264), gear (266b),
Timing belt (268
) to rotate the bell 1-(268) in the direction of arrow (e). Furthermore, this rotation is caused by a solenoid (SL).
5) is off, the signal is transmitted to the clutch gear (280) via the boot 1 bar 271a), gears (271b>, (275), (276), and the guide roller (21
0) is reversed into an arrow (j゛). On the other hand, the solenoid (
When SL5) is turned on, the arrow (
With the rotation in the opposite direction to i), the gear (274) meshes with the clutch gear (280), and the guide roller (210) rotates normally in the direction of the arrow (j>).

The pinch rollers (215) and (216) are each installed to be rotatable as a result of the guide roller <210), and the pinch roller (215) is attached to the guide cover (201).
), and the pinch roller (216) is attached to the arms (2
17) via a support shaft (218).

The guide cover (201) has a paper guide part (201b), which is normally set at the solid line position in Figure 2 and covers the right side of the paper refeeding unit (100), which can cause problems such as paper jams. At times, as shown in FIG. 3, the paper storage section (200) can be opened by tilting outward to a substantially horizontal position. Specifically, pins (203) and (204) provided at the front and back of the guide cover (201).

(205) is the front frame (101) and the back frame 11
), and the guide cover (201) can be engaged with the guide grooves (112>, (113)) and the right side surface of the pin (201).
03) engages with the lower end of the guide groove (112),
The magnetic plate (206) fixed to the upper end of the guide cover (201) is attracted to the magnet (114> provided on the frame (101>, (111)), so that the set state shown in the solid line in Fig. 2 is established. To open this guide cover (201) outward, open the guide cover (201).
), hold the handle (207) on the second part of the pin (20
3) as a fulcrum, and move the guide cover (201) itself in the direction of the arrow (
k) direction to release the coupling between the magnetic plate (206> and the magnet (114).At this time, the pin (204) moves and is located in the vertical part of the guide groove (113).Next, When the guide cover (201) is pulled upward and the pin (204> is disengaged from the guide groove (113)), the guide cover (201) rotates in the direction of arrow (k) due to the moment due to its own weight.Guide cover (2
01), the pin (203) is finally inserted into the guide groove (11).
2), and the pin (205) engages with the right side parts of the frames L, (101), and (111), so that the paper is set in a substantially horizontal state as shown in FIG. The accommodating part (200) is opened.

In this state, the storage section (200) or the paper refeed section (32
0) Remove the jammed paper. In addition, the opened guide cover (201) is used to directly eject the paper once wound onto the bobbin (230) to the outside of the paper refeed unit l-(100) without passing through the copying machine main body (1). Functions as a forced ejection tray. Forced ejection is executed by turning on a switch (SW) that can be operated from the outside by an operator when the guide cover <201) is opened, and this control will be described in detail later as a control procedure.

On the other hand, a photo sensor (SF
3) is installed to detect the open/closed state of the guide cover (201).

Next, the belt (240) for storing paper and the bobbins (230) and (235) for holding it will be explained.

The bobbins (230) and <235) are respectively attached to spindles (231> and (236)) rotatably mounted between the front frame (1o1) and the back frame (111), and the bobbin (230) is shown in FIG. The outer diameter indicated by the solid line, the bobbin (2
35) has an outer diameter shown by a two-dot chain line. Belt (2
Both ends of 40) are stuck to the bobbin (230), (235), and the idle roller (245), <246), (
The rack is passed to bobbin (230), (247),
235) and unwind. In the initial state, the belt (240) is wound back toward the bobbin (235) (indicated by a solid line in FIG. 2). And the bobbin (
230) is rotated in the direction of the arrow <m), the bobbin (235) is driven to rotate in the direction of the arrow (m), and the belt (240) is wound around the bobbin (230). Bobbin (230).

(235) and Bell 1-(240) are in the state shown by the two-dot chain line. After that, to return to the initial state, use the bobbin (
This is done by rotating the bobbin (235) in the direction of the arrow (m), thereby causing the bobbin (230) to rotate in the direction of the arrow (m').

The bobbins (230) and (235) are driven by a motor (M3) that can be switched between forward and reverse rotations and that can be controlled continuously.The drive mechanism will be explained here with reference to FIGS. 4 and 5. do.

The motor (M3) is fixed to the back frame (111) via a bracket (281), and is rotatably mounted on a timing pulley (282) fixed to its output shaft and a support shaft (283) fixed to the back frame (111). A timing belt (286) is inserted between the installed timing pulley (284a).
) are installed. The support shaft (283) is further equipped with a gear (
284b), bracket 1~(287), gear <288
a), (288b) are installed, and the pulley (284a)
and the gear (284b) can be rotated by one weight, and the gear (284b)
288a) and (288b) are rotatable under one weight. In addition, the support shaft (290) fixed to the back frame (111)
) are rotatably equipped with gears (291a) and (291b). A gear (284b) that rotates together with the pulley (284a) meshes with a gear (291a), and a gear (291b) that rotates together with this gear (291a) meshes with a gear (288a). Furthermore, this gear (
The gear (288b) that rotates together with the gear (288a) is connected to the gear (293) rotatably attached to the bracket (287).
) are meshed with each other.

On the other hand, the support shaft (250) fixed to the back frame (111)
.

(252>, (254) each have a gear (251)
, (253), gear (255a) that can be rotated by body weight
), <255b) are rotatably mounted. The gear (251) meshes with the gear (237) fixed to the end of the bobbin support shaft (236), and the gear (253) is engaged with the gear <255
a), and the gear (255b) is engaged with the bobbin support shaft (231
) is meshed with a gear (232) fixed to the end of the shaft.

The bracket (287) is biased in the direction of arrow (n) by a coil spring (294), and is
111) is connected to the plunger of a solenoid (SL4) fixed to the solenoid (SL4). When the solenoid (SL4) is turned off, the bracket (287) is connected to the coil spring (294).
) rotates in the direction of the arrow (n>), and the gear (293) meshes with the gear (251). When the solenoid (SL4) turns on, the bracket (287) rotates in the direction opposite to the arrow (n>). The gear (293) meshes with the gear (253) instead of the gear (251).

In the above configuration, the belt (240) is attached to the bobbin (230) by rotating the bobbin (230) in the direction of the arrow (m).
To wind it up, turn on the solenoid (SL4), engage the gear (293) with the gear (253), and turn on the motor (M3).
> is rotated in the direction of arrow (0). At this time, the rotational driving force of the motor (M3) is transmitted from the pulley (282) to the pulley (284a) and gear (284b) via the timing belt (286), and the gears (291a) and (29
1b), (288a), (288b) to gear <2
93>, causing the gear (293) to rotate in the direction of the arrow (p>. The rotation of the gear (293) is transmitted to the gear (255a).
), (255b) to the bobbin gear (232),
It is transmitted to the bobbin support shaft (231), and rotationally drives the bobbin (230) in the direction of the arrow (m). At this time, the gear (25
1) is the hook, and the bobbin (235) is the belt (24
The belt (235) rotates in the direction of the arrow (m).
40) onto the bobbin (235), turn off the solenoid (SL4) and shift the gear (293) to the gear (251).
) to drive the motor (M3) in the reverse direction in the direction of the arrow (0゛). At this time, the rotational driving force of the motor (M3) is transmitted to the gear (293) according to the above-mentioned path, and rotates the gear (293) in the direction of the arrow (p').
93) is rotated by the bobbin gear (251) via the gear (251).
37), is transmitted to the bobbin support shaft (236), and the bobbin (
235) is rotated in the direction of the arrow. At this time, the gear (253) is free, and the bobbin (230) is driven to rotate in the direction of the arrow (m') via the belt (240).

By the way, the belt (240) is attached to the bobbin (230), (
235) and when unwinding, simply wind the other bobbin (
235).

When the belt (230) is rotated, the belt (240) becomes loose. Therefore, in this embodiment, as shown in Section 6 and FIG.
), <238), a belt (257) with a circular cross section is stretched over the bobbins (235) and (238), and a resistance force is applied to the driven rotation of the other bobbin (235), (230), thereby effectively preventing the belt (240) from loosening. And so. That is, one bobbin (2
30) is rotated in the direction of the arrow (m), the other bobbin (235) rotates in the direction of the arrow (m) due to the tensile force of the belt (240).
It rotates in the direction of arrow (m') from the bell 1- (233) to the pulley (238) via the bell 1- (257).
) direction acts on the belt (257) and pulley (
233) or (238), and as a result, an appropriate tension is applied to the belt (240), so that the belt (240) does not loosen or sag. Bobbin (
The same applies when the belt (235) is rotated in the direction of the arrow (m), and the space when winding up the belt (240) can be effectively utilized.

The paper conveyed from the intermediate conveyance section (180) is
As will be detailed later, the belt (240) is attached to the bobbin (230).
It is wound up together with the paper and temporarily stored here. At this time, the outer diameter of the belt (240) increases as more paper is accommodated. Therefore, when the motor (M3) is driven at a constant rotation speed, the moving speed (paper storage speed) of the belt (240>) also increases, and the difference with the paper transport speed at the intermediate transport section (180) gradually increases. , in this example, Bell 1-(24
An idle roller (246) rotates as a result of the movement of
) is coated with a high friction material such as rubber material,
After ensuring the belt followability of the idle roller (246), the driven rotational speed of the idle roller (246) is detected, and this is fed back to the drive of the motor (M3), and the moving speed of the belt (240) (paper control so that the accommodation speed) remains constant at all times.

Specifically, as shown in FIGS. 6 and 8, a gear (300) is attached to the end of the spindle (248) of the idle roller (246).
and the support shaft (30) fixed to the front frame (101).
1) is equipped with gears (302a) and (302b) so as to be rotatable under one weight, and a support shaft (303) fixed to the front frame (101) is equipped with a gear (304a) and a pulse disk (304).
b) is rotatably provided as a single unit. Gear (30
0) meshes with gear (302a), and gear (302b) meshes with gear (304a).

The idle roller (246) is rotated by its spindle (24).
8) from gear <300) to gear (302a),
(302b).

(304, 8>) is transmitted to the pulse disk (304b) and rotates the disk (304b).The pulse disk (
A photosensor (SE7) is installed opposite the circumference of the disc (304b), and the rotation speed of the disc (304b) is read by the photosensor (SE7).

In addition, in order to detect the state of winding and unwinding of the belt (240), a transmission type photo sensor (
SE4) is installed, and an overrun mark (241>) is placed on the belt (240) as shown in FIG.

(241), a standby mark (242), and an end mark (243) are formed. Each mark (241
), (242).

(243) is formed by painting a transparent belt (240) with black paint on the back side of the unit slightly away from the side edge of the largest size paper stored in the belt (240),
Sensor (SE4) near the idle roller (246)
Detected in

In other words, as detailed in the control procedure later, the paper refeed unit (
When the power is turned on to the belt (240), the belt (240)
Rewind to the bobbin (235) side (return to initial position)
. In this case, the belt (240) is indicated by the arrow (q') in Fig. 9.
direction, and the sensor (SE4) reaches the standby mark (
242> is detected, the drive of the motor (M3) is stopped. If the standby mark (242) has already passed the sensor (SE4> and the unit (100) is powered off, the next When the power is turned on, no matter how much the bobbin (235) is driven in the direction of the arrow (m), a problem arises in that the sensor (SE4) cannot detect the standby mark (242).Therefore, in order to eliminate this problem, , in this embodiment, the standby mark (24
On the upstream side in the belt return direction of 2), there are overrun marks (241), (24
1) was established. Therefore, the detection of the standby mark (242) by the sensor (SE4>) not only stops the operation of rewinding the belt (240) to the bobbin (235), but also
Even if the return of the bell h (240) to the initial state starts from the time when the standby mark (242) has already passed the detection point of the sensor (SE4), the overrun mark (241>, Upon detection of (241), the return operation of the bell l-<240) is reliably stopped.

By the way, the width of the standby mark (242), overrun mark (241), and (241) is (L).
The pitch (L2) between the standby mark (242) and the overrun mark (241) is the pitch (L2) between the overrun mark (241) and (241).
l). This ensures the identifiability of mark detection by the combination of the sensor (SE4) and the timer.

On the other hand, the end mark (243) is provided on the bobbin (235) side of the bell 1- (240). When the belt (240) moves in the direction of the arrow (q>) when storing paper, and the end mark (243) is detected by the sensor (SE4), it is determined that the capacity - full amount of paper has been stored in the bell (240). do. The length (L3) of the end mark (243) is longer than the length in the storage direction of the maximum size paper stored in the belt (240), that is, the end mark (243) is
From the time when it is detected in SE4), all the sheets that have already been fed in the copying machine main body (1) are stored in the bell 1- (240) = 3
5 At the point when the end mark (243
) is set to a length that allows detection to continue.

Next, the switching claw (225) will be explained with reference to FIGS. 2, 6, and 7.

The switching claw (225) is connected to the frame (101), (111
) and a pulley (227) fixed to the end of the support shaft (226) and the end of the support shaft <211) of the guide roller <210). There is a bell with a circular cross section between the fixed pulley (212).
(258) is stretched. When the guide roller (210) is rotated in the direction of the arrow (j) when storing paper, the pulley (212) and bell 1- (258) are rotated in conjunction with this.
, 1 bar 227) are rotated, and the switching claw (225) is also urged in the direction of arrow (r), and is held at the solid line position in FIG. 2 by being regulated by a stopper (not shown). Switching claw (22
5) guides the paper conveyed from the guide roller (210) between the belt (240) and the scraper (228) with its guide surface (225a) at this solid line position. On the other hand, when refeeding the paper, the guide roller (210) moves with the arrow (
When intermittently rotationally driven in the j') direction, the switching pawl <225> is urged in the direction opposite to the arrow (r) through a similar path, and is regulated by another stopper (not shown) to move along the chain double-dashed line. The sheet held in position and fed out from the belt (240) is guided by the guide surface (225a) to the nip portion between the guide roller (210) and the pinch roller (216).

As described above, when the guide roller (210) is driven to rotate forward and backward in the direction of the arrow (j) or (j゛), the belt (
258) and the pulley (212) or (227), and no more stress than necessary will be applied to the switching pawl (225), which can be held at the solid line position or the two-dot chain line position.

The scraper (228) is made of a rigid thin plate,
A flexible resin film (229) is adhered to its surface, and is rotatably held by the switching claw (225) at its upper end. The tip of the film (229) contacts the outer peripheral surface of the bobbin (230) and the belt (240) wound thereon due to the moment due to its own weight, and the belt (240) moves from the solid line position to the two-dot chain line position in FIG. It is displaced according to the winding thickness and guides the paper being stored and the paper being fed out.

(Paper accommodating operation by the accommodating unit) The paper accommodating operation is the same in both the double-sided lobby mode and the composite copy mode.

In FIG. 2, the conveyance roller (
The paper conveyed in steps 190) and (191) first contacts the guide surface <220a) of the switching claw (220''), rotates the switching claw (220) to the solid line position, and moves the paper to the guide surface (220a). ) and the rib-shaped guide portion <201b) of the guide cover (201>), and the guide roller (21
0) and the pinch roller (215). The guide roller (210) is driven to rotate normally in the direction of arrow (j), and the pinch rollers (215) and (216) are driven to rotate. Therefore, the paper is conveyed around the guide roller (210) in the direction of arrow (j), and from between the guide plate (219) and the guide surface (225a) of the switching claw (225) set at the solid line position, Idle roller (246)
The scraper (228) is conveyed downward between the straight part of the belt (240) connecting the bobbin (230) and the scraper (228). The solenoid (SL4) is turned on and the gear (293) is turned on (
253), the motor (M3) is driven forward in the direction of arrow (0) at a predetermined timing after the leading edge of the paper is detected by the sensor (SE2>), and the motor (M3) is driven to rotate normally in the direction of arrow (0),
30) is rotationally driven in the direction of the arrow (m>).
The paper is wound onto the bobbin (230) together with the belt (240).

After the rear end of the paper is detected by the sensor (SE2), the motor (M3) is turned off at the timing when the paper is completely wound up on the bobbin (230), and the rotation of the bobbin (230) is stopped. The above operation is repeated for the second and subsequent sheets of paper, and the sheets are sequentially wound onto the belt (240).

As described above, stopping the driving of the bobbin (230) every time one sheet of paper is stored and driving the bobbin (230) intermittently is to control the interval between sheets discharged from the copying machine main body (1). The purpose is to make the length as short as possible when stored in the belt (240), to prevent an increase in the winding diameter of the bobbin (230), and to improve storage efficiency and space efficiency.

(Paper refeeding unit) The paper refeeding unit <320) includes a guide plate (321), a guide frame (325), and a guide plate (32) attached thereto.
9), registration rollers (330), (331), and the switching claw (220). As described above, the registration roller (330) is rotationally driven in the direction of arrow (s) via the clutch (CLI) (see FIGS. 4 and 5). The registration roller (331) is connected to the guide frame (32
5) is rotatably attached to the registration roller (330).
It contacts and rotates as a result. The guide frame (325) has a support shaft (326) between the frames (101) and (111).
The guide frame (182) and the guide cover (201) are released and then rotated upward to open the paper refeed path.

In addition, a photo sensor (SE3) is installed on the guide plate (321).
is attached via a bracket (322).

This sensor (SE3) has an actuator (323) that connects the guide surface (220b) of the switching claw (220) with the guide plate (
321) and detects the paper passing through the conveyance path.

(Paper refeeding operation) This is an operation in which the sheets of paper wound together with the belt (240) on the bobbin (230) are fed out one by one and fed into the paper refeeding path (40) of the copying machine main body (1), in double-sided copy mode. , and composite copy mode.

After all the paper that has been copied on one side has been wound onto the bobbin (230), when the operator instructs to start refeed copying [turn on the print switch (61), see Figure 10], the solenoid (SL4) ) is turned off and the gear (293
) is engaged with the gear (251), the motor (M3)
is reversely driven in the direction of the arrow (0'>), and the bobbin (235)
is rotated in the direction of arrow (m)'y5. As a result, the belt (240) is rewound from the bobbin (230), and the rear end of the stored paper in the storage direction is removed from the film (229) attached to the scraper (228).
) and the paper is peeled off from the surface of the belt (240), and the paper is fed out from the bobbin (230) with the rear end in the storage direction leading. The paper rises while being guided by the straight part of the belt (240> that reaches the idle roller (245) and the scraper (228), and the moving direction of the bell 1- (240) is suddenly changed by the idle roller (245). This separates the paper from the belt (240).
219) and the guide surface (225a) of the switching claw (225)
and is fed between the guide roller (210) and the pinch roller (216). At this time, the guide roller (210) is driven in the reverse direction in the direction of the arrow (j'). Therefore, the paper is completely conveyed around the guide roller (210) in the direction of the arrow (j') and passes between the guide surface (220b) of the switching claw (220) and the guide plate (321),
The registration rollers (330) and (331) are reached.

The rotation of the registration rollers (330) and (331) is started by a clutch (CLI) just before the leading edge of the paper in the refeeding direction arrives.
) is stopped by turning on the guide roller (210).
The bobbin (235) continues to rotate. Therefore,
The leading edge of the paper is connected to registration rollers (330) and (331).
) and forms a slight loop. When this loop is formed, the clutch (Cl3) is turned on to stop the rotation of the guide roller (210), and the motor (M3) is turned off to stop the rotation of the bobbin (235). Control here is performed based on a combination of a paper leading edge detection signal from a sensor (SE3) and a timer.

Next, the clutch (CLI>, (Cl3) is turned off, the motor (M3) is turned on, and the registration roller (
330).

(331), the guide roller (210) is rotationally driven, and the paper is moved through the guide frame (325) and the guide plate (32).
9) while being guided by the paper refeed path (
40). The purpose of causing the leading edge of the sheet to collide with the nip portion of the registration rollers (330) and (331) in a stopped state to form a loop at the leading edge of the sheet is to correct the pricking and feeding of the sheet. To ensure this purpose, a registration roller (330).

The conveying force (paper holding force) due to (331) was set to be stronger than the conveying force due to the guide roller (210), pinch rollers (215), and (216).

Thereafter, the paper refeeding operation is repeatedly performed based on the paper refeeding signal from the copying machine main body (1).

When all the sheets have been unwound from the bobbin (230), control is performed to rewind the belt (240) to the bobbin (235) and set it to the initial state.

(Measures against curling of paper) By the way, in this embodiment, during composite copying, the front and back sides of the paper are reversed by the ejection rollers (135) and (136).
43= A reversing means is installed on the upstream side of the storage part (200),
The paper winding direction <m> on the bobbin (230) in the storage section (200) was set to be the same direction as the rotation direction (8>) of the photosensitive drum (10) in the copying machine main body (1). This means that the direction of the curl formed on the paper when it is stored in the bobbin (230) is determined by the curvature of the photoreceptor drum (10) when the paper is re-fed and brought into close contact with the photoreceptor drum (10) again. This is to make it easier to separate the paper from the photoreceptor drum (10) by setting it in the opposite direction.

That is, in the operation of storing paper in the bobbin (230), the paper is fed into the storage section (200) with the first side (image-formed side) facing right in FIG. 2 in the double-sided copy mode,
It is wound up on a belt (240) with the first surface facing inside. At this time, the curl is formed such that the first surface is on the inside. Then, after the paper is re-fed, the blank second surface, which is the outside of the curl, comes into close contact with the photosensitive drum (10), and the image is completely transferred.

On the other hand, in the composite copy mode, the paper is reversed by controlling the forward and reverse rotation of the ejection rollers (135) and (136), and the first side is turned to the left in FIG. 200) and is wound onto a belt <240) with the first side facing outside. At this time, the curl is formed such that the first surface is on the outside. After the paper is fed again, the first surface, which is the outside of the curl, comes into close contact with the photosensitive drum (10), and a new image is transferred over the copied image.

In other words, regardless of whether it is in the double-sided lobby mode or composite copy mode, the image forming surface when refeeding paper is the storage section (20
0), the direction of the curl is opposite to the curvature of the photoreceptor drum (10), and the paper can be easily separated from the photoreceptor drum (10). Become.

[Operation Panel] As shown in FIG. 10, the operation panel (60) is installed on the upper front part of the copying machine body (1), and has a print key (61) for starting the copying operation and a multi-copying operation. An interrupt key (62) for temporarily interrupting the copy operation, a clear/stop key (63) for temporarily stopping the copy operation or canceling the set number, a numeric keypad (64) for setting the number of multi-copy copies (number set), 7-segment)/method display section (65) for displaying the number of copies and copying machine status, up/down key (66) for setting copy density,
(67) and its display LED group (68), a paper selection key (69) for selecting the paper size, and a paper size display LED group (70) for displaying the selected paper size.
), magnification selection keys for selecting copy magnification (71>
, a group of magnification display LEDs that display the selected magnification (
72), a copy mode selection key (73) for selecting one-sided, two-sided, and composite copy modes, one-sided copy mode display ED (74), two-sided copy mode display LED (74),
75) and a composite copy mode display LED (76).

[Control circuit] Fig. 11 shows the control circuit of the copying machine, and shows the copying machine main body (1).
A first microcomputer (8
0), is mainly configured with a second microcomputer (90) for controlling the operation of the paper refeeding unit (100).

In the CPU (80), the switch matrix (81
〉, display section (65), various display LEDs (68),
(70).

(72), (74)', (75), and (76) are connected via a decoder (82). The switch matrix has keys (61) to (6) on the operation panel (60).
4), (66), (67), (69), (71)
.

In addition to the built-in switch in (73), it is composed of a paper size and paper presence/absence detection sensor (PSI), (PS2), an attachment/detachment detection switch (MS) for the paper refeed unit (100), etc. Further, a main motor (Ml), a developing motor (M2>, a timing clutch, a paper feed clutch, an electrification charger, a transfer charger, etc.) are connected to the output boat of the CPU (80).

The CPU (90) has a paper detection sensor (
SEL>, (SE2), (SE3), belt (240
) mark detection sensor (SE4), guide cover (2
The opening/closing detection sensor (SE5) of 01) and the forced ejection switch (澗) are connected, and the output terminals are connected to the solenoids (SLI) to (SL5), clutches (CLI), and (CL2) that drive the paper conveyance system. It is connected. Motor (MS) that drives bobbins (230) and (235)
is the circuit (Ql >, which is incorrectly connected to the CPU (90)).
(Ql).

Constant speed control is performed in (Q3). The circuit (Ql) uses a pulse disk (304b) to control the rotation speed of the idle 0-ra (246).
A signal from a sensor (SE7) detected via the sensor (SE7) and a speed signal from either the output terminal (PL) or (P2) are input. The terminal (Pl) outputs a speed signal for driving the bobbin (235>, and the terminal (P2) outputs a speed signal for driving the bobbin (235).
A speed signal for driving 30) is output. Each of these signals is converted into a voltage value within the circuit (Ql), and the circuit (Ql) is converted into a voltage value.
Ql). On the other hand, the circuit (Q3) outputs a reference waveform voltage for maintaining a constant rotation speed of the pulse disk (304b) to the circuit (Ql). The circuit (Ql) compares the voltage values from the circuits (Ql) and (Q3) to form an appropriate waveform voltage and outputs it to the motor (MS). Also,
The moving speed of the belt (240) driven by the motor (MS) is set slightly higher than the paper conveyance speed when storing paper, and is set slightly lower when refeeding paper.

The CPUs (80>, <90) can communicate with each other. Information set using various keys on the operation panel (60) is transmitted from the CPU <80> to the CPU (90). The CPU (90) transmits, to the CPU (80), a signal that the number of copies of paper has been accommodated, a wait signal that waits for the copying operation, and the like. Although omitted in FIG. 11, the CPU (80) is connected to the document scanning optical system (20).
It is also connected to another CPU that controls the sorter, and when a sorter (<400) is installed, it is also connected to its control CPU.

[Control Procedure] Next, the control procedure of the copying machine main body (1) and the paper refeeding unit 1-(100) executed by the CPUs (80) and (90) will be explained in detail with reference to FIG. Describe. By the way, in the following explanation, on-edge refers to switches,
Off-edge means that a sensor, signal, etc. is switched from an off state to an on state, and off-edge means that a switch, sensor, signal, etc. is switched from an on state to an off state.

(Description of Flags and Signals) Here, various flags and signals used in the following control procedure will be explained in advance.

Jam flag: Displays that a jam has occurred within the copying machine main body (1) and within the paper refeed unit (100). C
In the control at P U (80), step (512
) When the occurrence of a jam is detected in sub-L-chin of the jam detection/processing executed in ), the set is completed, and when the jammed paper removal process is confirmed, it is reset. In the control by the CPU (90), it is set when the occurrence of a jam is detected [see step (S384)], and reset when the jam processing is completed [see step (S392)].

Jam A flag: When the power is turned on to the paper refeeding unit (100), this flag indicates that paper that the previous operator forgot to take out remains in the storage unit (200) [set in step (5234), step (5392).

(5412)].

Jam B flag: Indicates that a jam has occurred during paper transport in the paper refeeding unit (100) [Steps (5374), (5376), (5378), <
5381) Teset, reset at step (5392)].

Copy flag: "Set in step (598), step (Sill), (5116), (5120) Teriset" to indicate that the copying machine main body (1) is in the process of copying.

Single-sided mode flag 2 Instructs execution of single-sided coby mode [step (S23), set in (530), reset in step (527)].

Double-sided mode flag 2 Instructs execution of first side copy in double-sided copy mode [set in step (527), steps (523), (529) Telicera l-].

Composite mode flag 2 Instructs execution of first side copy in composite copy mode [set in step (S29), reset in steps (523) and (530)].

Overprint paper flag: Instructs to feed paper from the upper cassette (30) [set in steps (546) and (5412), reset in steps (545) and (5116)].

Underprint paper flag: “Set in step (545), instruct paper to be fed from the lower cassette (32), in step (54)
6), reset code at (5116).

Paper refeed flag: Indicates that the copy process is for paper refed from the paper refeed unit
(5366), reset with <5407>].

Empty signal: Paper feed force cell l-(30), (32
) to indicate that there is no paper [Step (5)
55) to set, and step (551) to reset.

Stop flag: Instructs to temporarily stop the subsequent copying operation during the copying operation [step (553),
(566), (5101) to set, step (S
58).

<564>, reset in (S96)].

Determined Flag 2 Number of copies per original (number of copies) and storage unit (200) when duplex or composite copy mode is selected
Displays the completion of comparison with the number of sheets that can be accommodated (N) [Set in step (580), step (574), (
S83) to reset].

Copy operation permission flag: Indicates that copy operation is possible without any problems. In particular, the number of sheets that can be accommodated (N
) is reset when the number is set and prohibits the copy operation [Set in step (579), step (580)
to reset].

Paper feed prohibition signal: Displays that the belt (240) has been wound up to the end on the bobbin (230) and prohibits further operation [Set in step (5303), set in steps (5116) and (5412) reset].

Paper feed wait signal: Displays that the paper refeeding unit (100) is not ready to accommodate paper and prohibits paper feeding operation [Set in step (S227), set in step (S227),
249), reset in (S255)].

Paper presence signal: When the number of sheets (number of copies) is stored in the storage section (200), a cellar 1 is issued [step (5310)], and all the sheets are ejected from the storage section (200). [Step (5308
), (5363), (5412) ].

Preprocessing flag: The paper refeed unit (
100) to return to its initial position "set in step (5223), reset in steps (S249) and (S255)".

Standby flag: Indicates that Bell I-(240) has returned to its initial position [step (5249).

(5255) to set, step (5310) to reset].

Drive request signal: Main motor (M
l) [Step (5227), (5
293).

(S323), set in (5407), step (5
249), (S255).

(5310), (S'329), (5409)].

Winding flag: When returning the belt (240) to the initial position, "steps (5246) and (5252) are displayed to indicate that the standby mark (242) and overrun mark (241) have been detected by the sensor (SE4). )
, set at (5254), step (5249),
(5255)].

Position A flag 2 Indicates that the region (L2) of the belt (240) is located at the detection point of the sensor (SE4) [Set in step (5246), step (5249)
) to reset].

Position B flag: Displays that the region (Ll) of the belt (240) is located at the detection point of the sensor (SE4) [set in steps (5252) and (5254), reset in step (5255)].

Main body ejection signal: Displays that paper has been detected by the paper detection sensor provided near the ejection rollers (38) and (39) of the copying machine main body (1).

Paper re-feeding: Displays that paper is being re-feeded [set in step (5323), step (5
329), (reset with 5363>).

Conveyance permission signal: Permits paper to be sent out from the paper refeeding section (320).

Ejection flag 2 Operator stores paper in storage section (200)
[Set in step (5407), step (541
2) to reset].

(Control of copying machine body) FIG. 12 shows the main routine of the CPU (80).

When power is applied to cpu (go), step (51
) to reset the random access memo J (RA
M), initialize registers, timers, counters, etc., and perform initial settings to put each device into the initial mode. Next, in step (S2), the CPU (90)
etc., and when the end of the initial communication is confirmed in step (S3), an internal timer is started in step (S4). This internal timer not only determines the time required for the main routine, but also functions as a criterion for determining the end of counting of each timer used in the following subroutines.

Next, in step (S5), it is determined whether or not the jam flag is "0". Each of the subroutines (S6) to (513) is sequentially called.

In step (S6), input of the number of copies (number of copies per original) set using the numeric keypad (64) is accepted. In step (S7), input of the copy mode (single-sided, double-sided, composite) set by the switch (73) is accepted. In step (S8), the input of the paper size set by switch (69) is accepted. Step (S9)
Now, accept the clear/stop input from the switch (63). In step (510), when the duplex or composite copy mode is selected, it is determined whether or not the set number of sheets (number of copies) can be stored in the paper refeeding unit (100), and the copying operation is permitted. Determine whether or not. In step (511), a copy operation under the selected copy condition is processed. In step (512), a jam within the copying machine body (1) is detected. Specifically, the jam timer set in step (511) is determined, and if jam occurrence is detected, the jam flag is set to 11.
・Then, it determines whether to remove the jammed paper and resets the device to a copy-enabled state. In step (513), the CPU
(90) etc.

After calling each of the above subroutines, step (514
, ), wait for the internal timer to finish counting, and then step (S
Return to 4).

FIG. 13 shows a copy mode setting subroutine executed in step (S7) of the main routine of the CPU (80).

Here, first in step (521) the copy flag is set to "
After confirming that the refeeding unit (100) has been reset to "0", it is determined in step (522) whether the paper refeeding unit (100) is attached or not based on the on/off signal from the microswitch (MS). If it is not attached, turn on the LED (74) in step (523) and set the single-sided mode flag to 11'', and turn on the LED (75).
(76) is turned off, the duplex mode flag and the composite mode flag are reset to "0", and this subroutine ends. On the other hand, if it is fully attached, step (524)
), it is determined whether the selection switch (73) is on edge or not, and in step (S25) it is determined whether the paper refeed flag is "o". If both are YES, that is, the copying machine body (1) is not in the copying operation [YES in step (521)],
Every time the selection switch (73) is turned on, except when copy processing is transferred to the second side during double-sided and composite copying, steps (526) and subsequent steps are executed to switch the copy mode. The copy mode is initially set to one-sided copy mode, and then can be switched to duplex, composite, or one-sided in rotation.

That is, in step <526), the single-sided mode flag is set to "1".
”, and if it is set in rlj, turn off L E D (74) in step (S27),
Turn on D (75) and set the single-sided mode flag to "
o, and set the duplex mode flag to "1".

When the single-sided mode flag has been reset to "oJ", it is determined in step (528) whether the double-sided mode flag is "1" or not, and if it is set to rl, then step (S
29) to turn off the LED (75) and turn off the LED (76).
), the duplex mode flag is reset to "o", and the composite mode flag is set to "1".

If both the single-sided mode flag and the double-sided mode flag have been reset to ``0,'' L E is set in step (530).
D (76) is turned off, the LED (74) is turned on, the composite mode flag is reset to "0", and the single-sided mode flag is set to "1".

FIGS. 14a and 14b show a paper selection subroutine executed in step (S8) of the main routine of the CPU (80).

First, in step (541), it is determined whether the paper refeed flag is "0" or not, and if it has been reset to "0", step (541) is performed.
After confirming that the copy flag has been reset to "O" in step 542), it is determined in step S43 whether or not the selection switch (69) is on-edge. If it is on-edge, set overprint paper or unfed paper alternately. That is, if it is determined in step (S44) that the overprint paper flag is "1", the overprint paper flag is reset to "0" and the underprint paper flag is set to "1" in step (S45). on the other hand,
If it is determined that the top picture paper flag is "0" in step (S44), the bottom picture paper flag is set to "0" in step (546).
and set the overprint paper flag to "1". Thereafter, the paper size that can be accommodated in the paper feed unit selected in step (548>) is displayed on the LED group (70).Step (542).

This step (54) also applies when it is determined No in (543).
8> is processed.

On the other hand, in step <541), the paper refeed flag is set to ``rl''.
If it is determined that this is the case, the copy process is to be performed by refeeding paper, so in step (547), the paper size for copying the first side is substituted as the paper size for copying the second side, and the process proceeds to step (548). do.

Next, in step (549) it is determined whether the empty signal is off-edge, and if it is off-edge, that is, it is not the timing when paper has been replenished, then in step (550) it is determined whether there is no paper in the currently selected paper source. Determine whether or not. If there is paper, the empty signal is reset to "0" in step (551). On the other hand, if there is no paper, step (S52)
It is determined whether the copy flag is "1" or not. If it is set to "1" (if a copy operation is in progress), the stop flag is set to "1" in step (S53) to instruct a temporary stop of the subsequent copy operation, and step (S54)
The set number (the set number of copies) is stored in the RAM. Furthermore, in step (S55), the empty signal is changed to "
1”.

If it is determined in the step (549) that the empty signal is on-edge, that is, if paper is replenished, the original value stored in the step (554) is again substituted for the preset number. Further, in step (S57), the number of copies that are insufficient at this time is calculated, and in step (S58), the stop flag is reset to "0", thereby making it possible to restart the copying operation.

FIG. 15 shows the clear/stop switch (6) executed in step (S9) of the main routine of the CPU (80).
3) shows the subroutine that determines the status.

The clear/stop switch (63) has the following functions.

(1) When copying is not in progress, Initializes copy conditions each time it is turned on.

(2) When copying is in progress, ) The first time it is turned on, the subsequent copy operation is interrupted.

1i) Initialize copy conditions when turned on for the second time.

1t) When the print switch (61) is turned on after the first turn on, the copying operation is restarted.

(3) When there is no paper in the paper feed section during the first side copy operation in duplex or composite copy mode,) If you turn it on once when there is no paper in the paper feed section, it will set to the second side copy mode. .

11) When the paper feed section is full of paper, press the print switch (6).
When 1) is turned on, the first copy operation is restarted.

Therefore, in this subroutine, when it is confirmed in step (561) that the switch <63) is on, it is determined in step (562) whether or not the stop flag is "1". If set to rl, step (563)
If it is determined that the copy flag is 10'', that is, if the copy operation is not in progress, the stop flag is reset to rO'' in step (S64), and the copy conditions are initialized in step (568).

If the stop flag is "0" [No in step (S62)], and if it is determined in step (S65) that the copy flag is "0", the step (568) is processed. If the copy flag is set in rIJ, i.e.
If the copying operation is in progress, the stop flag is set to 11'' in step <566), and the number of copies set at that time (number of copies) is stored in the RAM in step (567).

FIG. 16 shows a subroutine for copy operation permission determination executed in step (510) of the main routine of the CPU (80).

Here, it is determined whether or not the storage unit (200) can receive the number of sheets set when the duplex or composite copy mode is selected.

When it is determined in step (571) that a copy operation is not in progress (copy flag is 10''), the following steps are processed. In step (572), it is determined whether the single-sided mode flag is "0.", and in step (S73), it is determined whether the paper refeed flag is "10", and if either one is set to "1", that is, If the single-sided copy mode has been selected or the paper has already been transferred to the re-feed copy operation, the determined flag is reset to r□ in step (574), and the process returns to step (S79).
) sets the copy operation permission flag to "rl".

On the other hand, if YES in both steps (S72) and (573), that is, the duplex or composite copy mode has been selected and the copying operation to the first side has not yet started, the determined flag is flagged in step (575). is 10''. If reset to r□, step (576
) Calculate the length (L5) of the paper selected in the transport direction,
In step (577), the number of sheets (N) that can be stored in the storage unit (200) is calculated using the following formula.

N=L4/(L5+L6)...
... ■L4: Effective length of belt (240) [distance from standby mark (242) to end mark (243)] L52 Length in the transport direction of stored paper L6: Paper on belt (240) The information on (L4) and (L6) is the spacing between sheets when they are stored in step (S2).
The data is sent from the CPU (90) to the CPU (80).

Next, in step (578), the number of sheets that can be accommodated (N) calculated using the formula 0 and the number of copies (number of copies) are compared, and N
If the number is ≧, the copy operation permission flag is set to "1" in step (579). If N is a numeric value, in step (580) the copy operation permission flag is reset to "0" to prohibit the copy operation, and the determined flag is set to "
1”.

Further, even if the above-mentioned judgment is completed, if the number of sheets or the paper size is changed, the above-mentioned judgment is repeated again. That is, when it is determined that the determined flag is "1" in step (575), it is determined in step (581) whether the set number has been changed, and in step (582) it is determined whether or not the paper size has been changed. , if either is YES, step (58
In 3), reset the determined flag to "OJ.

FIGS. 17a and 17b show a copy operation subroutine that can be executed in step (Sll) of the main routine of the CPU (80).

First, in step (591), it is determined whether the copy flag is "r□", and if it is reset to "0", that is, if copying is not in progress, then in step (592), the print switch (61) is turned on. is detected, it is confirmed in step (593) that the copy operation permission flag is set to rl, and that the empty signal is reset to "0" in step (594). In S95), it is determined whether the stop flag is "1". If the stop flag is set to "1", the stop flag is reset to "0" in step (S96), and the stop flag is set to "0" in step (597). The original value stored in the number is substituted, and the copy flag is set to 11'' in step (598). Immediately after determining that the stop flag is "o" in step (S95), step (S95)
98).

Next, in step (S99), it is determined whether the copy flag is "rl", and if it is reset to "O", the process immediately moves to step (5108). rl", it is determined in step (5100) whether the paper feed prohibition signal is "1" or not. If it is set to ``1'', it means that a trouble has occurred in the paper refeeding unit (100), and the stop flag is set to ``1'' in step (5101), and the current paper feed is set in step (5105). After the feeding of the paper inside is completed, the paper feeding operation is stopped. Also, step (5100
), it is determined in step (5102) whether the stop flag is "1" or not, and if it is set to "1", step (5105) is performed.
process. Next, when completion of paper feeding is confirmed in step (5106), the number of paper sheets fed up to now is substituted for the set number in step (5107), and the process moves to step (5108).

On the other hand, the stop flag is set to 1 in the step (5102).
If it is determined that the paper feed weight signal is "0", it is determined in step (5103>) whether or not the paper feed weight signal is "0", and if it is reset to "rO", the predetermined cassette (30) or (32 ) and moves to step (5108).When the paper feed wait signal is "1"
If it is set, the process immediately moves to step (5108).

Next, in step (5108), a copying operation and a paper transporting operation are performed to form an image on the fed paper. After that, in step <5109>, the single-sided mode flag is set to 11.
”, and if it is set to “1”, that is, if copy processing is in progress in one-sided copy mode, it is determined in step (5110) whether or not copying for the specified number has been completed. When the process is completed, the copy flag is reset to "0" in step (Sill), and this subroutine is ended.

If it is determined in step (5109) that the single-sided mode flag is 10'', that is, if copy processing is in progress in duplex or composite copy mode, it is determined in step (5112) whether or not the paper refeed flag is 10''. do. If it is reset to "0", that is, when copying to the first side,
In step (5113), it is confirmed that the set number of copies have been completed, and in step (5114) it is determined whether the paper presence signal is on-edge. If it is on-edge, that is, the storage part (
200) has accommodated the number of sheets to be set, step (
5115) to store the selected paper source and its paper size in RAM.
to be memorized. Furthermore, in step (5116), the top paper flag and bottom paper feed flag are reset to "O", the paper refeed flag is set to "1", and the copy flag and paper feed prohibition signal are set to "0", respectively. and exit this subroutine.

On the other hand, in the step (5112), the paper refeed flag is set to "1".
”, that is, when copying to the second side, the paper presence signal is set to “0” in step (5117).
Determine whether it has been reset to .

If it is reset to "0", that is, the housing section (200
), if the last sheet has been re-fed from step (51
After confirming the completion of copying to the final paper in step 18), the already stored flag of the paper feed unit is set to "1" in step (5119). Then, in step (5120), the paper refeed flag and the copy flag are reset to "0", and this subroutine is ended.

(Control of paper refeed unit) FIG. 18 shows the main routine of the CPU (90).

When the CPU (90) is powered on, step (5)
201), the random access memory (RAM) is cleared, registers, timers, counters, etc. are initialized, and initial settings are made to put each device into the initial mode. Next, in step (5202) the CPU
(80), and when the end of the initial communication is confirmed in step (5203), step (5204)
starts the internal timer. This internal timer has the same function as that of the main routine of the CPU (80).

Next, in step (5205), the jam flag is set to "0".
Determine whether or not. If it is set to rl, the process immediately moves to step (5209), and if it is reset to rO, each subroutine of steps (5206) to (5209) is called.

In step (5206), the copying machine body (1) '・i
~Processes the operation of returning the belt (240) to the initial position before the one-sheet operation is started. In step (5207), the operation of discharging the paper to the paper discharge tray (175) or the sorter (400) and the operation of storing the paper in the storage section (200) are processed. In step (5208), the paper is placed in the storage section (200).
Processes the operation of refeeding sheets one by one. Step (5
In step 209), the paper refeeding unit (100) detects and processes the paper jam.

After calling each of the above subroutines, step (52
10), wait for the internal timer to finish counting, and then step (
5204).

On the other hand, during processing in CPU (90), CPU (80)
When there is an interrupt request from C, in step (5211)
Processes communication with the PU (80).

FIG. 19 shows a preprocessing subroutine executed in step (5206) of the main routine of the CPU (90).

Here, first, it is determined in step (5221) whether the copy flag is rIJ or not, and if it has been reset to "0", the process moves to step (5225), and if it is set to '1', it moves to step (5222). It is determined whether the paper presence signal is off-edge or not. If it is off-edge, the storage part (20
It is assumed that the paper refeeding operation from step 0) has been completed, and step (
In step 5223), the preprocessing flag is set to 11'', and the process moves to step 5225. If the paper presence signal is not off-edge, the preprocessing flag is set to "1" in step (S224).
If it is set to '1', the process moves to step (5205), and if it is reset to 'O', the process moves to step (5231).

In step (5225), it is determined whether the standby flag is "0." Transition. If the standby flag is reset to 0, step (522
After confirming that the drive request signal is reset to "0" in step 6), the drive request signal is reset in step (5227).
Set the paper feed weight signal to "rl" and drive the motor (M3) in the belt rewinding direction. At the same time, the state counter used in the following step (5230) is reset to "rO" and timer A and trouble timer are started. Here, the bobbin (235) is rotationally driven in the direction of the arrow (m>), and the belt (240) is attached to the bobbin (235).
being rewound to. For timer A, step (5
230) subroutine (see FIG. 20).

The trouble timer is for detecting a trouble in which the belt (240) does not move within a predetermined time when the motor (M3) is driven.

Next, in step (5228), it is determined whether the winding flag is on-edge or not, and if it is on-edge, the belt (240
) standby mark (242) or overrun mark (241) was detected by the sensor (SE4),
In step (5229), the solenoid (SL4), (S
L5) is turned on, the motor (M3) is driven in the belt winding direction, and a trouble timer is started. As a result, the bobbin (230) is rotationally driven in the direction of the arrow (m), and the belt (240) is wound around the bobbin (230). Then, in step (5230), the belt (
240) is temporarily overrun to the initial position and then stopped.

Next, in step (5231), it is determined whether or not the paper refeed flag is "1". If it is set to "1", then in step (5232) the paper is transferred to the storage section (200) according to the operator's selection. Take measures that allow for forced discharge.

If the paper refeed flag is reset to 10'', it is determined in step (5233) whether the sensor (SE3) is turned on. If the sensor (SE3) is turned on, it is determined that the paper presence signal is reset because the power was turned off before or during copy processing to the second side, and the paper presence signal is reset in step (S234).・Set the muA flag to "1".

FIG. 20 shows a subroutine for stopping the belt at the initial position, which is executed in step (5230) during the preprocessing in step <5206>.

In this subroutine, step (5227) is executed during preprocessing.
, (5229> executes control to turn off the driven motor (M3).The values of timers A and B used here can be set under the following conditions.

Timer A>L2/V... Group ■Timer A>Timer B>LL/V...
・・V: Movement speed of belt (240) L1 Pitch of Niover run mark (241) L2 Standby mark (242) and overrun mark (24
1) The stopping process at this distance from the sensor (
Each time SE4) detects marks (241) and (242) and becomes on-edge, it increments the state counter in step (S242), and increments the state counter in step (5243).
), the value of the state counter is checked, and the following control is executed based on the value.

When the value of the state counter is 1', that is, after the motor (M3) is driven in the belt rewinding direction, the sensor (S
When the first on-edge of E4) is successfully detected, it is determined in step (5244) whether or not the winding flag is "0". If it is reset to "0", step (5245
), it is determined whether timer A has finished counting.

If the count is completed, the belt (240) is activated by the sensor (SE4) before the motor (M3) is driven in the rewinding direction.
) is located opposite the detection point of the standby mark (
242>, it can be determined that it was on the downstream side in the rewinding direction [within the range of area (L4)]. In other words, the sensor (SE4
The point where the first on-edge is detected can be determined as a standby mark (242), and step (S246)
) to turn off the motor (M3), set the winding flag and position A flag to rIJ, and set the state counter to “
Reset to 0''.

If timer A has not finished counting, the bell) (2
40) facing the detection point of the sensor (SE4) can be determined to be region (L2) or downstream of region (L2) in the rewinding direction, and timer B is started in step (S247).

Next, if it is determined in step (S244) that the winding flag is "1 yo", in step (5248) it is confirmed that the position A flag is set to "1", and in step (S249) the motor is (M3) is turned off. This stops the rewinding operation of the belt (240). at the same time,
Reset the winding flag and position A flag to "0", set the standby flag to "1", and reset the state counter to "011".
SL4) and (SL5) are turned off, and the drive request signal, paper feed wait signal, and preprocessing flag are reset to "0".

After starting timer B in the step (S247), if the value of the state counter reaches "2°", that is,
When the second on-edge of the sensor (SE4) is detected, it is confirmed that the winding flag is reset to "0" in step (5250), and then step (5251) is performed.
), it is determined whether timer B has finished counting.

If the count is finished, press sensor (SE4) 3.
If the count is not completed after waiting for the second on-edge, it can be determined that the position where the belt (240) was facing the detection point of the sensor (SE4>) was in the area (L2).
Step (S252) is turned off.

This stops the rewinding operation of the belt (240).

At the same time, the winding flag and position B flag are set to "rl" and the state counter is reset to "0".

After determining that timer B has finished counting in the step (5251), if the value of the state counter becomes "3", that is, if the third on-edge of the sensor (SE4) is detected, the process proceeds to step (5253). ), it is determined whether the winding flag is rO. If it is reset to "0", turn off the motor (M3) in step (S254),
Set the winding flag and position B flag to "1" and reset the state counter to "0".On the other hand, if the winding flag is set to "1", step (S255)
) to turn off the motor (M3) and turn off the solenoid (SL4>,
(SL5) is turned off, the winding flag and position B flag are reset to "O", and the standby flag is set to "1".Furthermore, the state counter is reset to "0", and the drive request signal and supply Reset the paper wait signal and preprocessing flag to 10.

FIG. 21 shows a subroutine for ejecting and storing operations executed in step (5207) of the main routine of the CPU (90).

Here, in step (5281), the single-sided mode flag is "1" or not, in step <5282>, the paper refeed flag is "1", and in step (5284), the duplex mode flag is "1" or not. The following processing is performed according to the copy mode being processed at that time.

When copying one side [YES at step (5281)], when copying the second side in duplex or composite copy mode [step (5281)]
5282), the paper is discharged straight to the paper discharge tray (175) or the sorter (400) in step (5283). When copying the first side in double-sided copy mode [YES in step (5284)], step (
In S285), the paper is directly conveyed to the storage unit (200), and in step (5287), the paper is stored in the storage unit (200).

When copying the first side in composite copy mode [Step (S2
84), in step (5286) the paper is switched back by the ejection rollers (135) and (136) to turn the paper upside down and then transported to the storage unit (200).
In step (5287), the paper is stored in the storage section (200).

Note that steps (S283), (5285), (5
The details of the control procedure in step 286) will be omitted.

FIGS. 22a and 22b show the subroutine of the accommodation operation executed in step (5287).

First, in step (5291), it is determined whether the copy flag is "1" or not. If it is reset to "0", the process moves to step (5296), and if it is set to "rl", the process proceeds to step (5292). When the on-edge of the main body ejection signal is confirmed, that is, when the leading edge of the copied paper reaches the ejection section of the copying machine main body (1), the drive request signal is set to 11'' in step (5293). Next, step (5)
294), when the on-edge of the sensor (SE2) is confirmed, that is, the paper sent to the paper refeeding unit (100) is transferred directly from the switching claw (125) to the intermediate conveyance section (180).
(during double-sided copy mode), or is switched back and reversed by the ejection rollers (135) and (136), and then transported to the intermediate transport section (180) (during composite copy mode). When the tip reaches the detection point of the sensor (SE2), the solenoids (SL4) and (SL5) are turned on in step (5295), and the motor (M3) is turned on.
The timer C1 and the jam timer A, which determine the drive start timing of the timer C1, are started. Now the guide roller (210)
is rotationally driven in the direction of arrow (j), and motor (M3
), the bobbin (230) is ready to be driven.

Next, when it is confirmed in step (5296) that the timer C has finished counting, in step (5297) the motor (
A trouble timer is started to confirm that the motor (M3) is being driven normally, the motor (M3) is driven in the winding direction, and the timer C is reset. Thereafter, if the off-edge of the sensor (SE2) is confirmed in step (5298), that is, the trailing edge of the paper is
When detected in step 2), in step (S299), a timer D that determines the off timing of the motor (M3) is started, the jam timer A is reset, and a storage counter is incremented.

The storage counter is for counting the number of sheets stored in the storage section (200).

During processing here, the paper is transferred to the guide roller (210), pinch rollers (215), (216) and belt (240).
), guided by the scraper (228) and arrow (m)
Together with the belt (240), the belt (240) is wound onto a bobbin (230) that rotates in the same direction. And step (5300)
When it is confirmed that the timer D has finished counting, the motor (M3) is turned off and the timer D is reset in step (5301). Further, in step (5302), it is determined whether the sensor (SE4) is on-edge or not. If it is on-edge, at that point the sensor (SE4)
Detects the end mark (243) of the belt (240)
is wound up to the terminal end, and step (530
In step 3), the paper feeding prohibition signal is set to "rl" to prohibit the subsequent paper feeding operation.

Next, in step (5304) it is determined whether the stop flag is off-edge, and in step (5305) it is determined whether the empty signal is off-edge. YES to both
If so, the solenoid (SL4
), (SL5) is turned on, the paper presence signal is reset to 0, and the process moves to step (5309). If the stop flag is not off edge, the process moves to step (5309). If the empty signal is off edge, the process moves to step (5309). For example, in step (5306) it is determined whether the copy flag is "1" or not, and if it is set to "1", the copy operation is restarted after the clear/stop switch (63) is turned on once. It is determined that it is, the step (5308) is executed, and the process moves to step (5309). If the copy flag has been reset to "0", it is determined that the previous copy condition has been canceled, and in step (5307) it is determined whether the count value of the accommodation counter is equal to or greater than "1"'. If the count value is “1” or more, step <53
10), through (5311), the accommodation counter is reset to “0” in step (5312).
0'', this subroutine is immediately terminated.

Executing copy operation to the first side, step (5309)
When it is determined that the count value of the storage counter is equal to the set number, the predetermined number of sheets of paper has been stored in the bobbin (230), so the solenoid (SL4) is activated in step (5310).
), (SL5) is turned off, the drive request signal is reset to "0", the paper presence signal is set to "11", and the standby flag is reset to "0" and set to "1". Furthermore, the step (
After confirming that the stop flag has been reset to "rO" in step (5311), the accommodation counter is reset to "0" in step (5312), and this subroutine is ended.

Figures 23a, 23b, 23c [K is the CPU (90
) shows a subroutine for paper refeeding operation executed in step (5208) of the main routine.

First, in step (5321), it is determined whether the paper refeed flag is "11" or not, and if it is reset to "0", this subroutine is immediately terminated. If it is set to '1', it is determined in step (S322>) whether the copy flag is on-edge, and if it is on-edge, it is determined in step (5323).
), the paper refeeding flag and drive request plug are set to "1", the state counter is reset to "0", and the process moves to step (5325). After that, step (5324)
After determining that the paper refeeding flag is "1", the process moves to step (S325). In step (5325), the current state of the state counter is checked, and the motor (M3) and clutch (CLI) are controlled according to the count value.
, (Cl3), etc.

In the initial stage when the current value of the state counter has been reset to "0", it is determined in step (5326) whether or not the transport permission signal is "1". If it is set to "0", the process moves to step (5360), and if it is set to "1", it is determined in step (S327) whether or not the stop flag is "0". If it has been reset to "O", paper refeeding is prepared for the first time. That is, step (
5328), the timer F, which determines the interval between sheets to be re-fed, is allowed to start, and the state counter is set to "1". If the stop flag is set to "1", in order to temporarily stop the paper refeeding operation, the copy flag, paper refeeding flag, and drive request flag are set to "0" in step (S329).
and turn off the motor (M3).

When the current value of the state counter is 1'', it is determined in step (5330) whether the transport permission signal is "1" or not, and if it is fully set to "1", step (5331) is performed.
Allow the timer F to continue counting, and proceed to step (53).
32) drives the motor (M3) in the rewinding direction, turns off the clutch (CLI), turns on the clutch (Cl3),
The jam B timer for detecting the occurrence of a jam in the paper refeeding section (320) is started, and the state counter is set to "2".
”. Now the registration roller (330),
The rotation of (331) is stopped, and the guide roller (
210) is reversely driven in the direction of the arrow (j゛), the paper begins to be fed out from the bobbin (230).

If it is determined that the transport permission signal is "0" in the step (5330), the timer F is set in the step (5333).
The count is temporarily stopped.

When the current value of the state counter is "2", it is determined in step (5334) whether the transport permission signal is "11", and if it is set to "1", it is determined in step (S335).
), the timer F1 to timer B continue to count, and in step (S336), the clutch (CLI) is kept in the off state and the motor (M3) continues to be driven in the rewinding direction, and the process moves to step (5339). . If the transport permission signal is reset to "0", step (5337)
The counts of the timer F and jam timer B are temporarily stopped, and the clutch (CLI) is stopped in step (5338).
) is turned on to stop the guide roller (210) from rotating in reverse, the motor (M3) is turned off, and the process moves to step (5339).

Next, when it is confirmed in step (5339) that the sensor (SE3) is on-edge, that is, when the leading edge of the paper fed out from the bobbin (230) is detected by the sensor (SE3), in step (5340) Reset the jam timer B and newly install the jam timer C and registration roller (
330), a timer G for determining the paper loop amount immediately before (331) is started, and the state counter is set to "3''.

When the current count of the state counter is "3", it is determined in step (5341) whether the transport permission signal is "11", and if it is set to "1", step (5342) is performed.
) to continue counting the timer F, timer G, and jam timer C, and in step (5343), the clutch (CL
I) is kept in the off state and the motor (M3) continues to be driven in the rewinding direction, and the process moves to step (5346).

If the conveyance permission signal is reset to "0", the count of the timer F1 timer G and jam timer C is allowed to be temporarily stopped in step (5344), and the count of the timer F1 timer G and jam timer C is temporarily stopped.
5) Turn on the clutch (CLI) and turn on the motor (M3).
is turned off and the process moves to step (534, 6). next,
When it is confirmed in step (S346) that the count of timer G has ended, in step (5347>) the clutch (CLI)
) is turned on, the motor (M3) is turned off, and the state counter is set to 4''. This temporarily stops the operation of feeding the paper from the bobbin (230), and the leading edge of the paper moves to the registration roller (330), ( 331), and a slight loop is formed.

When the current value of the state counter is 4'', it is determined in step (5348) whether or not the transport permission signal is "1", and if it is set to "1", the timer F5 jam timer C is set in step (5349). The count of the timer F1 is continued and the process moves to step (5351), and if it is reset to '0', the count of the timer F1 to timer C is temporarily stopped in step (5350), and then the process proceeds to step (5351).
351). Next, when it is confirmed in step (5351) that the timer F has finished counting, step (5351)
5352), the motor (M3) is restarted to be driven in the rewinding direction, the clutches (ct, 1) and (CL2) are turned off, and the state counter is set to "5".

With this, the guide roller (210) is reversed in the direction of the arrow (j゛), and the registration rollers (330>, (
331) is driven, and the paper is sent out from the paper refeeding section (320).

When the current value of the state counter is "5'," it is determined in step (5353) whether the transport permission signal is "1" or not, and if it is completely set to "1", step (5354) is performed.
), the jam timer C continues to count, and in step (5355), the motor (M3) is driven in the rewinding direction and the clutches (CLI) and (CL2) are allowed to continue in the off state, and the process moves to step (5358). do. If the transport permission signal is reset to "0", step (53
At step 56), the count of the jam timer C is temporarily stopped, and at step (S357), the motor (M3) is turned off, the clutches (C1l) and (CL,) are turned on, and the process moves to step (5358). Next, step (535
When the off-edge of the sensor (SE3) is confirmed in 8),
That is, when the trailing edge of the paper is detected by the sensor (SE3), the jam timer C is reset in step (5359) and the state counter is reset to "0"'. With this, one sheet of paper has been re-fed from the storage section (200) to the re-feed path (40>) of the main body (1) of the copying machine.

Next, in step (5360), when the on-edge of the sensor (SE4.) is confirmed, that is, the standby mark (242) of the belt (240) is detected by the sensor (SE4), and the belt (240) is If it is determined that the rewind has been completed, the timer G is started in step (5361). At this time, the paper to be re-fed is the last paper. The timer G is set to the time required for the trailing edge of the last sheet to pass through at least the nip portion of the registration rollers (330) and (331). Next, Stenbu (S3
62>, it is determined whether or not the count of the timer G has ended, and if the count has not ended or the timer G is not operating, it is determined that the stop flag is off-edge in step (5364), and step If it is determined in (S365) that the copy flag has been reset to "OJ", the paper refeed flag is reset to 10 in step (5366). On the other hand, if it is confirmed in the step (S362) that the timer G has finished counting, then in the step (5363)
) to reset the paper presence signal to "0", and then turn the motor (M3>
, clutches (CLI), and (CL2) are turned off, the paper refeeding flag is reset to "O", and timer G is reset, and this subroutine ends.

24a and 24b show a jam detection/processing subroutine executed in step (5209) of the main routine of the CPU (90).

Here, the occurrence of a jam in each part of the paper refeeding unit (100) is detected and warned, the operator is instructed to remove the jammed paper, and once the jammed paper is removed, the apparatus is reset.

First, in step (5371), it is determined whether the jam flag is "10" or not. If it is set to "1", a jam has already occurred, and the process immediately moves to step (5383). If it is reset to r□, step (53
73), (5375), and (S377) for each jam timer A and B.

It is determined whether the count of C has ended or not, and if the end is confirmed, it is determined that a jam has occurred, and step (S374).

(S376), set the jam B flag to “1” in (5378).
” and moves to step (S383). Further, in step (S379), a trouble timer is set [step (5227)].

(5229) A sensor (SE7) that determines whether or not the reference count has ended, and if the end is confirmed, monitors the driven rotation of the idle roller (246) in step (5380)
Determine whether or not there is a pulse input to. If there is no input, it is determined that the motor (M3) does not operate normally, the jam B flag is set to "1" in step (5381), and the process moves to step (5383). On the other hand, if there is an input, the trouble timer is reset in step (5382) and this subroutine is ended.

In step (5383), the jam signal is sent to the CPU (80).
After sending a call to , the jam flag is set to "1" in step (5384). The jam signal is processed by the CPU (80) and displayed on the display section 65) of the operation panel (60). Then, in step (5385), it is determined whether the jam A flag is ``rlj'', and if it is set to ``rl'', in step (5386), it is confirmed that the discharge flag is reset to ``0'', and then In step (5387), all drive system operations are stopped, and in step (5388)
A forced ejection subroutine for directly ejecting the paper from the storage unit (200) to the outside is processed. On the other hand, the step (
If it is determined in step (5385) that the jam A flag has been reset to "0", the jam flag is set to "1" in this case, so the operation of all drive systems is stopped in step (5389). Here, the operator opens the guide cover (201) and removes the jammed paper. The sensor (SE) opens and closes the guide cover (201).
5), and the sensor (S) is detected in step (5390).
When the off-edge of E5) is confirmed, it is determined that the jammed paper has been removed and the guide cover (201) has been closed, and the jam signal is reset in step (5391). Further, in step (S392), all jam flags and jam timers are reset, and this subroutine is ended.

FIG. 25 shows step (5) in the preprocessing subroutine.
232) or the forced ejection subroutine executed at step (5388) in the jam detection/processing subroutine.

Here, based on the opening operation of the guide cover (201) and the ON operation of the switch (SW), the paper stored in the storage section (200) is transferred to the belt (240) and the bobbin (230).
) by rewinding directly from the paper refeed unit (100
) is discharged to the outside.

First, in step (5401), the jam A flag is "1".
In step (5402), it is determined whether the paper presence signal is "rl", and in step (5403) it is determined whether the copy flag is "10". Forced ejection of paper can only be executed when the jam A flag is set to "1" or when the paper present flag is set to "1" and the copy flag is reset to "0". . If the state is executable, step (540
After confirming that the discharge flag has been reset to "0" in step 4), the sensor (SE5) is reset in step (5405).
is turned off, and step (5406
) to determine whether the switch (SW) is on-edge.

The sensor (SE5) is turned off when the guide cover (201) is opened. Therefore, if the sensor (SE5) cannot be turned off completely, this subroutine is terminated. switch(
SW) is operated by the operator, and when its on-edge is confirmed, the drive request signal is set to 1 in step (5407).
1" and reset the copy permission signal to "rO". At the same time, the paper refeed flag is reset to "0", the discharge flag is set to "1", and the motor <M3) is driven in the rewinding direction.

As a result, the sheets stored in the bobbin (230) are sequentially fed out from the belt (240), and as shown in FIG.
10) The paper is ejected from the pinch roller (216) onto the guide cover (201').

Next, in step (5408), it is determined whether the sensor (SE4) is on-edge, and if it is on-edge, that is,
When the standby mark (242) of the belt (240) is detected by the sensor (SE4), it is determined that the rewinding of the belt (240) is completed, and the drive request signal is reset to "0" in step (5409). , motor (M3)
be able to) Furthermore, after confirming that the discharge flag is set to 11'' in step (5410), it is determined in step (5411) whether the sensor (SE5) is on-edge. When the guide cover (201) is closed and the sensor (SE5) is on-edge, step (54)
12), set the copy permission signal to "1", reset the ejection flag and jam A flag to "rO", set the overprint paper flag to "11", and set the paper present signal and paper feed prohibition signal to "rO". 0'' and terminate this subroutine.

[Second Embodiment] In the above-described embodiment, the pre-processing subroutine (see FIG. 19) for returning the belt (240) of the paper storage section (200) to the initial position and the step (5230) in this subroutine are performed. In the belt drive stop processing subroutine (see Fig. 20) that can be executed with the belt (240)
Timer A1 and timer B were used to detect the amount of movement. If the moving speed of the belt (240) is not constant, the pulse signal [corresponding to the moving amount of the belt (240)] of the sensor (SE7) that motors the driven rotation of the idle roller (246) is sent to timer A and timer B. May be used instead. Therefore, such a control procedure will be explained as a second embodiment. The control procedure here is specifically the same as that shown in FIGS. 12 to 25, and the flowcharts shown in FIGS.
Control is performed based on the flowchart shown in FIG.

Here, the pulse count of the sensor (SE7) is allowed to start at step (5227') and step (5247'), and at step (5245') it is determined whether the pulse count is larger than the reference value (Na) or not at step (5251').
), it is determined whether the pulse count is larger than the reference value (Nb). The reference values (Na) and (Nb) are set under the following conditions.

NaXP>L2...
...■NaXP>NbXP>LL
--■P: Belt per pulse (240)
Movement distance L1 Niover run mark (241) 2nd standby mark (242) and overrun mark (24)
1) [hereinafter referred to as margin] Effects of the Invention As is clear from the above explanation, according to the present invention, the switching means for selectively discharging the paper out of the paper refeeding device is switched, and When the forced ejection instruction means is operated, the belt is driven in the rewinding direction, so the paper remaining wound around the belt can be easily and directly ejected from the machine. Since it does not pass through the main body of the image forming apparatus, it can be discharged quickly.

[Brief explanation of the drawing]

1 to 25 show an embodiment of a paper refeeding device according to the present invention, FIG. 1 is a schematic configuration diagram of a copying machine body equipped with a paper refeeding unit, and FIG. 2 is a paper refeeding unit. 3 is a partial configuration diagram showing the guide cover in an open state, FIG. 4 is a rear view of the back frame, FIG. 5 is a perspective view of the drive mechanism from the back frame side, and FIG. FIG. 7 is a front view of the front frame, FIG. 7 is a perspective view showing the internal structure of the paper refeeding unit from the front frame side, FIG. 8 is a perspective view showing other internal structures of the paper refeeding unit from the front frame side, and FIG. The figure is a plan view of the paper storage belt, FIG. 10 is a plan view of the operation panel,
Figure 1 is a block diagram of the control circuit, Figures 12, 13, 14a, 14b1m, 15, 16, and 17.
Figure a, Figure 17b, Figure 18, Figure 19, Figure 20, Figure 21, Figure 22a, Figure 22b, Figure 23a, Figure 23.
Figures b, 23c, 24a, 24b, and 25 are flowcharts showing the control procedure, respectively. FIGS. 26 and 27 are flowcharts showing the control procedure of the second embodiment. (1) Copying machine body, (10) Photosensitive drum, (40) Paper refeed path, (100) Paper refeed unit, (120) Paper feed Switching section, 180)・
... Intermediate conveyance section, (200... Paper storage section, 201
... Guide cover, (210) ... Guide roller, (215, (216) ... Pinch roller, 230
). (235)...Bobbin, 240>...Paper storage belt, 320>...Paper refeed unit, (SW)...Forced ejection switch, (SE5...Open/close detection sensor.

Claims (1)

[Scope of Claims] 1. The paper discharged from the image forming apparatus main body can be sent to the image forming apparatus main body from the paper accommodating part after it is once stored in the paper accommodating part, and the paper accommodating part is connected to two belts. It includes a belt that is stretched between winding shafts and is wound back and forth, and when the belt is wound on one shaft, the paper is wound together with the belt on the shaft, and the belt is wound on the other shaft. In a paper winding type refeeding device that sometimes feeds out the paper that has already been wound up, means for instructing an operation to forcibly eject the paper stored in the paper storage section; a switching means that is installed at or near a branch point between a path for storing paper and a path for refeeding paper from the storage section, and selectively discharges the paper out of the paper refeeding device; A sheet refeeding device comprising: control means for driving the belt in a rewinding direction when the switching means is switched and the instruction means is operated. 2. Claim 1, wherein the switching means is a guide cover that can be opened and closed at or near the branch point.
Refeeding device as described.