JPH02213866A - Paper refeeding device - Google Patents

Abstract

PURPOSE:To easily eject paper left under the state that it is taken up to a belt to the outside of a device by ejecting the paper drawn from a paper housing part on a cover member at the opening time of the cover member which can be opened and closed. CONSTITUTION:The cover member 201 functions also as a guide member which guides to house and to draw the paper and it is also disposed as the outside frame of a paper refeeding device 100. Then, a paper drawing part is opened by opening the cover member 201 outside. When the cover member 201 is opened, the belt 240 is driven in a rewinding direction. At this time, the paper left in the housing part 200 is drawn from the belt 240 and ejected on the cover member 201. That means, when the paper is forcibly ejected from the housing part 200, the paper is directly ejected to the outside of the paper refeeding device without being passed through an image producing device main body. Besides, the cover member 201 functions as the opening and closing means of the paper drawing part and simultaneously functions as a paper ejecting tray. Thus, the paper left in the housing part 200 by being taken up to the belt 240 is ejected to the outside of the device easily and by simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a paper refeeding device, in particular, a single-sided copied sheet discharged from an image forming device main body such as a copying machine or a laser 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 (paper feed).

However, in many cases, the paper is heated and curled by the fixing device in the image forming device, so it is necessary to guide and store the paper one by one into the tray. 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 Patent No. 3.862.802 (corresponding domestic application, Japanese Patent Publication No. 57-42861),
No. 8-188260, No. 59-39561 (
As described in the corresponding U.S. patent application No. 4,496,142, a belt is wound around one or two shafts and is provided so as to be able to be rewound, and the paper ejected from the copying machine is A paper winding type refeeding device has been proposed in which paper is wound together with a belt and then fed out during rewinding. According to this,
It is possible to reliably store and refeed sheets one by one. However, the problem here is that the operator may inadvertently put unnecessary paper into the belt, or if the previous paper is left in the belt when copying starts. It is processing. Such inconveniences can occur if: ■ the previous operator forgets to remove the paper from the paper refeeding device; ■ if you mistakenly select double-sided 7-immediate copying and execute the copy process on the first side; ■ when the paper storage Occurs when the device is powered off during the process, etc. In the paper winding method using a belt, it is practically impossible for an operator to manually remove the paper from the belt.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to easily and easily remove paper that has been wound up on a belt and left in a storage section due to incorrect mode settings or forgetting to perform a paper refeed operation in a paper winding type paper refeeding device. The objective is to make it possible to discharge the waste outside the machine with a suitable configuration.

Means and Function for Achieving the Object In order to achieve the above object, the paper refeeding device according to the present invention is provided with a cover member that can open and close the paper feeding section of the paper storage section, and the cover member is opened. It is characterized in that the paper fed out from the paper storage section is sometimes discharged onto the cover member.

The cover member preferably also functions as a kite member for guiding the storage and feeding of paper, and is also installed as an external frame of the paper refeeding device. This cover member opens the paper feeding section by opening outward. When the cover member is completely opened, 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 discharged onto the cover member.

That is, when the paper is forcibly removed from the storage section, the paper is directly ejected out of the paper refeeding device without passing through the main body of the image forming device, and the cover member functions as an opening/closing means for the paper feeding section. It can also be used as a newspaper tray.

[Bundle of blank spaces] 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 refeeding unit (100), which is an embodiment of the present invention, is located on the right side of the copying machine body 1) where the paper section and the refeed paper receiving section are formed. A sorter (400) is detachably attached to the right side of the paper refeeding 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 photoreceptor drum 10) is provided to be rotatable in the direction of arrow (a), and around it are a main eraser lamp (11), a sub-charging charger (12), and a double laser lamp (12). 13), Main charger (14)
, a magnetic brush type developing device (15), a transfer charger (16), a paper separation chamber (17), and a cleaning device (18). Photoreceptor drum (
10) is sensitized and charged by passing through the eraser lamps (11), (13) and charging chips (12), (14), and is sensitized by the scanning optical system 20) from the direction of arrow (b). Upon image exposure, an electrostatic latent image is formed on its surface.

Copy paper is stored in two upper and lower paper cassettes (30) and (3).
2). In this example, the upper cassette (
A4 size horizontally arranged paper is placed in the lower cassette (30).
2> contains sheets of B5 size paper arranged horizontally. The size of the copy paper stored in each paper cassette (30), (32) is as follows:
Connect the magnet or protrusion provided in 2) to the sensor (PSI >, (
PS2), it can be identified based on the code given in advance. At the same time, the sensor (Psi),
(PS2) also detects the presence or absence of paper in the cassettes (30) and (32).

The paper in the upper cassette (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).
> is supplied into the machine, guided to a timing roller (35) by a guide means (not shown), and stopped there. - 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 charger (16), and separated from the surface of the photoreceptor drum (10) by AC discharge from the separation charge (17). 36) through the fixing device (
37), where the image is fixed, and then sent to 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 this process, and the sheet is ready for the next copying process.

On the other hand, a paper refeed unit (
The paper re-fed from the timing roller (3
A refeeding path (40) is provided, which is composed of rollers (41), (42), etc., for conveying the paper to 5).

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 above-mentioned 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 in the paper refeed path (40) and the paper transport system in the paper refeed unit (100), which will be 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 already been copied on one side during duplex/composite copying. Rolling paper storage section (20
0), 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). Whether or not the paper refeed units 1 to (100) are installed in the copying machine main body (1) can be determined by checking the micro switch (1) installed on the copying machine main body (1).
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 topmost 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) is connected to the guide surface (1) that guides the paper toward the ejection rollers (135) and (136).
25a), the receiver transfers the loaded paper to the intermediate conveyance roller (190)
, an arcuate guide surface (12) that guides toward the (191) side.
5b), it has an arcuate guide surface (125c) that guides the paper from the discharge rollers (135) and (136) side to the intermediate conveyance rollers (190) and (191) side. A flexible resin film (129) is not fully adhered to the third guide surface (125c) to serve as a paper guide. This flexible film (129) has a guide plate (123) at the tip.
The paper that has been completely conveyed from the left in FIG. 2 is passed to the right [in the direction of arrow (A)]; It has a function of guiding to the guide surface (125c).

The switching claw (125) is rotatably mounted around a support shaft (126) provided between the front frame (101) and the back frame (111) of the unit 1-(100), as shown in FIG.
As shown in Fig. 7, the support shaft (126) is connected to the front frame (10
It is connected to the plunge of a solenoid (SLI) provided in 1) via an arm (127). Switching claw (1
25) is set to the chain double-dashed 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 toward the ejecting paper/ray (175) side or the sorter (400) side, and an arcuate guide that guides the paper toward the right side of the unit (100>). having a surface (130b);
Frame (101>, (
in) is rotatably mounted between the two. This support shaft (1
31) is connected via an arm (132) to the plunger of a solenoid (SL2) provided on the front frame (101), as shown in FIGS. 6 and 7, similar to the switching pawl (125). . The switching claw (130) is a solenoid (
When the solenoid (SL2) is turned off, it is set to the dotted chain line position in FIG. 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 a frame (1ot),
(to), and is detachable from the sorter (40).
0) is removed if not connected.

The paper discharge tray (175) is supported at one end by a support plate (176). 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 (
100) and when the sorter (400) is attached, the paper discharge tray (175) and support plate (176) are removed and the switching claw (130) is attached in their place.

On the other hand, the guide plate (123) has a photosensor (SEI).
) is attached via a bracket (133).

This sensor (SEL) 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 υ ejecting roller (135) is coaxially equipped with a slightly larger diameter retaining roller (135a) (see Figure 5), and in addition to ejecting paper, it also performs paper switchback during composite copying. Therefore, it is possible to drive forward and reverse rotation. Here, the drive mechanism will be explained with reference to FIGS. 4 and 5.

The support shaft <140) fixed to the back frame (111) has a bracket 1-(141) and a timing boot 1 bar 142.
a), a gear (142b) is rotatably mounted, and the pulley (142a) and gear (142b) are rotatable as a unit. The gear (144) is attached to the bracket (141).
, (145), <146) are each rotatably mounted, the gear (144) meshes with the gear (142b),
The gear (145) meshes with the gears (142b) and (146). Upper (IIυr low roller 5) support shaft (
A gear (138) is fixed to the end of the gear (137).

In addition, the bracket (141) is biased in the direction of arrow (C) by a coil spring (147), and is connected via a lever holder 48) to the plunger of a solenoid (SL3) fixed to the back frame (111). has been done. When the solenoid (SL3) is turned off, the bracket (14
1) is rotated in the direction of arrow (C) by the action of the coil spring (147), and 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 1 ba 1
50a) is rotatably attached to a bracket (152) fixed to the back frame (111) via a support shaft (153), and a gear (150b) rotatably provided as one unit with the pulley (150a) is attached to the bracket. It meshes with a gear (155) rotatably attached to the tip of (152). Further, the gear (155) meshes with a gear (50) fixed to the shaft end of the lower discharge roller (38) of the copying machine main body (1). Another timing pulley (195a) is connected to the intermediate conveyance roller ( 190) is fixed to the end of the support shaft <192).

In the above configuration, the conveyance system of the paper switching section (120) is driven by the main motor (Ml) within the copying machine main body (1). In other words, gear (50) in main motor (Ml)
is always 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 (Sn3
) is turned off, Boo 1 pa 142a), gear (
142b).

(145>, (146) to the gear (138), and the upper discharge roller (135) and the
35a) is rotated forward in the direction of arrow (f). At this time, the gear (144) rotates idly. On the other hand, the solenoid (S
When n3) is turned on, the gear (144) meshes with the gear (138) as the bracket (14, 1) rotates, and the roller (135).

(135a) is reversed in the opposite direction 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 pin (183), 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 arrow (g), the intermediate conveyance path is opened, making it easier to remove jammed paper. The intermediate conveyance roller (190) is rotationally driven in the same direction [arrow (e) direction] by the timing belt (151), and the other roller (191) is 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 mounted 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 conveyance operation by the paper feed switching unit and intermediate conveyance unit)
When paper is ejected after copying is completed, the solenoids (SLI) and (Sn2) 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 (Sn3) is also turned off, and the discharge rollers (135) and (136) are driven to rotate normally. When the sorter (400) is disconnected, the paper sent from the ejection rollers (38) and (39) of the copying machine main body (1) to the paper switching section (120) is passed through the guide plate (123) and the switching claw. (125) guide surface (125a
), 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 single paper tray (175) is installed, the switching claw (130) is removed and the paper is placed on the output roller (175).
35), direct output tray (175) from (136)
It is discharged to J2.

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 intermediately conveyed while being guided by the upper part of the guide plate (181) and the arcuate guide surface (125b) of the switching claw (125). 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 completely ejected from the copying machine main body (1) in composite copy mode, the solenoid (
SLI ) is off, solenoid (Sn2) 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 (Sn
3) is initially turned off, and the discharge roller (135),
(136) is 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 pressure at the rear end of the paper is detected by the sensor (SEI), 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 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 (1
35).

(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. ) while being guided by the intermediate conveyance roller (190
).

It is sent from <191> to the storage section (200).

Next, when the leading edge of the following paper is detected by the sensor (SEL), 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) is stopped, and the switching claw (125>
, (130) respectively return to the positions indicated by the two-dot chain lines.

(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), heald unwinding bobbin (235)
, BeL 1-(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).
, pinched with pinch rollers (215>, (216),
Feed it to the lower bobbin (230). At this time, the bobbin (
230) is rotated in the direction of arrow (m), and the paper is wound onto the bobbin (23o) together with the belt (240).

When refeeding paper, the top 5 bobbin (235) is rotated in the direction of arrow (m) to move the belt (240) to the bobbin (235).
At the same time, the paper is peeled off by a scraper (228) and fed upward, and sent to the paper re-feeding section (320) from a guide roller <210> which reverses in the direction of the arrow (j゛).

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 1958) fixed to the support shaft (192) of the intermediate conveyance roller (190), and a timing mounted on the back frame (111) via the support shaft <263). Pulley (261
A timing belt (260) is stretched between the gear (260) and the timing pulley (261a), and the gear (261b) which can rotate as one unit with the timing pulley (261a) is connected to the gear (260) of the clutch (CLI).
64). The clutch (CLI) is attached to the end of the support shaft (332) of the registration i-roller (330). The clutch gear (264) is always rotatable, and furthermore, a support shaft (265) is attached to the back frame (111).
) is engaged with the gear (266b) attached through the gear.

A timing pulley (266a) that can rotate integrally with this gear (266b) and a timing belt (268 ) is allowed. The support shaft (270) is further equipped with a gear (271).
b), the bracket (273) is rotatably mounted, and the gear (271b) is rotatable as one unit with the boot 1 bar 271a).

The bracket (273) has gears (274) and (275
) and (276) are respectively rotatably mounted, and the gear (275) meshes with the gears (271b) 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 (273) of the bracket (273).
Either 74) or 276 can be engaged interchangeably. That is, the bracket (273) is fully biased in the direction of the arrow (i>) by the coil spring (277), and the solenoid (SL5) fixed to the back frame (111)
) is connected to the plunger. Solenoid (SL5
) is turned off, the bracket (273) rotates in the direction of arrow (i) under the action of the coil spring (277), and the gear (276) meshes with the clutch gear (280). When the solenoid (SL5) is turned on, the bracket (273
) rotates in the direction opposite 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) and (Cl3) are in the OFF state, the rotation of the gears (264) and (280) is controlled by the registration roller shaft (332) and the guide roller shaft (2).
11), and when the rotation is turned on, the transmission of the rotation is cut off.

In the above configuration, the timing belt (151)
The driving force can rotate the timing belt (260) in the direction of arrow (e) via the pulleys (195a) and (195b), and also
), clutch gear (264), gear (266b), timing belt (268) via
and rotates the belt (268) in the direction of arrow (e). Furthermore, this rotation is caused by the solenoid (SL5)
is turned off, the pulley (271a) and gear (2
71b), (275), and (276) to the clutch gear (280>), and the guide roller (210)
is reversed to the arrow (j'). On the other hand, the solenoid (SL
5), the arrow (i) of the bracket (273)
As the gear (274) rotates in the opposite direction, the gear (274) meshes with the clutch gear (280), and the guide roller (210) rotates normally in the direction of 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), and is normally placed at the solid line position in Figure 2, and covers the right side of the paper refeed unit (100) to prevent paper jams, etc. When a problem occurs, the paper storage section (200) can be opened by tilting it outward to a substantially horizontal position as shown in FIG. Specifically, the bins (203) and (204>) are provided at the front and back of the guide cuff (201).

(205) is the front frame (101) and the back frame <11
The guide cover (201) can be engaged with the guide grooves (112), (113) and the right side surface of the bottle (1).
203) engages with the lower end of the guide groove (112), and the magnets provided on the frames (101) and (111)
y) The magnetic plate (206) fixed to the upper end of the guide cover (201) is attracted to (114), so that the second
The set state is indicated by the solid line in the figure. To open this guide cup <- (201) outward, the guide cover (
Hold the handle (207) on the top of the bottle (201)
203) as a fulcrum, rotate the guide cover (201> itself slightly in the direction of the arrow (k) and attach the magnetic play) (206).
and the magnet (114). At this time, the bottle (204) is moved and positioned at the vertical part of the guide groove (113). Next, when the guide cover (201) is pulled upward and the bottle (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. In the guide cover (201), the bin (203) eventually engages with the upper end of the guide groove (112), and the bin (205) engages with the right side portion of the frames (101) and (111). As a result, as shown in FIG. 3, the sheet is set in a substantially horizontal state, and the sheet storage section (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 that has been wound onto the bobbin (230) to the outside of the paper refeeding unit (100) without passing through the copying machine main body (1). Functions as forced υF output 1~ray. 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 (SE
5) 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 (101) 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
40) is fixed at both ends to bobbins (230), (235), and idle rollers (245), (246), (
The rack is passed to bobbin (230), (247),
235) and then rewound. 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 rotationally driven 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). Finally the bobbin (230).

(235), Heald (240) is 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), and the bobbin (230) is driven and reversed 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 spindle (283) fixed to the back frame (111). Timing bell 1-(28
6) is stretched. The support shaft (283) further includes a gear (284b), a bracket (287), and a gear (288).
a), (288b) are installed, and the pulley (284a)
and gear 〈284b) can be rotated by one weight, and 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 (2
The gear (zssb) that rotates together with 88a) is the gear (293>) that is rotatably mounted on the bracket (287).
It meshes with.

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

(252) and (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) meshes 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 1- (287) is biased in the direction of arrow B- (n) by a coil spring (294), and is also
111) is connected to the plunger of the solenoid (SL4). When the solenoid (SL4) is turned off, the bracket (287) is connected to the coil spring (294).
), the rotating gear (293) meshes with the gear (251) in the direction of arrow (n). When the solenoid (SL4) is turned on, the bracket (287) rotates in the direction opposite to the arrow (n), and 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 boot 1 bar 284a) and the 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 arrow (p). The rotation of the gear (293) is controlled by 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
0) to follow the arrows (,,,') to rotate. on the other hand,
To rotate the bobbin (235) in the direction of the arrow (m) and rewind the belt (240) onto the bobbin (235), turn off the solenoid (SL4) and engage the gear (293) with the gear (251). and move the motor (M3) in the direction of the arrow (0').
Drive in reverse direction. At this time, the rotational driving force of the motor (M3) is transmitted to the gear (293) according to the aforementioned path, causing the gear (293) to rotate in the direction of the arrow (p').

The rotation of the gear (293) is transmitted to the bobbin gear (237) and the bobbin support shaft (236) via the gear (251).
The bobbin (235) is driven to rotate in the direction of arrow (m). At this time, the gear (253) is free and the bobbin (23)
0) 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 (230) is driven to rotate, the belt (240) becomes loose. Therefore, in this embodiment, as shown in FIGS. 6 and 7, a pulley (233>
, (238) is stretched with a belt (257) having a circular cross section, 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 (23
0) 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 bell I-<240).
It rotates in the direction of arrow (m') from the pulley (233) to the pulley (238) via the belt (257).
Rotational force in five directions 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 diameters of bells 1 to (240) increase as sheets are accommodated. Therefore, when the motor (H3) 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. Therefore, in this embodiment, the belt (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 integrally rotatable, and a support shaft (303) fixed to the front frame (101) is equipped with a gear (3o4a) and a pulse disk (304).
b) are provided integrally and rotatably. 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).

(304a) to the pulse disk (304b), causing the disk (304b) to rotate. Pulse disk (3
A photosensor (SE7) is installed facing the circumference of the disk (304b), and the rotation speed of the disk (304b) is determined by the photosensor (SE7).
SE7).

In addition, in order to detect the winding and unwinding states of the bells 1 to (240), a transmission type photosensor (SE4) is installed as shown in FIG. As shown in Figure 9, there is an overrun mark (241>).

(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 power to the unit 1-(100) is turned off, When the power is turned on next time, no matter how much the bobbin (235) is moved in the direction of the arrow (m), there will be a problem that the sensor (SE4) will not be able to detect the standby mark (242).This problem has been resolved. Therefore, in this embodiment, the standby mark (2
42) on the upstream side in the belt return direction, an overrun mark (241) with a different pattern from the mark (242), <2
41) was established. Therefore, not only is the operation of rewinding the belt (240) onto the bobbin (235) stopped upon detection of the standby mark (242) by the sensor (SE4), but also the standby mark (242) is already detected by the sensor (SE4).
Even if the belt (240) starts returning to its initial state from the time it passes the detection point, the sensor (SE4) detects overrun marks (241), (241) and the belt (240) The return operation will be reliably stopped.

By the way, the width of the standby mark (242), O/H one-run mark (241), (241) is (
The pitch (L2) between the standby mark (242> and the overrun mark (241)) is set to be larger than the pitch (Ll) between the overrun mark (241) and <241>. 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 l-<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 belt (240) has stored the capacity - full of paper. . The long end mark (243) (L3) is a bell)
・It is longer than the storage direction length of the maximum size paper stored in (240), that is, the paper feed error has already occurred in the copying machine main body (1>) from the time when the end mark (243> is detected by the sensor (SE4)). End mark (243) by sensor (SE4) when all the paper is stored in bell 1- (240)
The detection period is set to a length that continues to be detected.

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). A belt with a circular cross section (
258) is installed. When the guide roller (210) is rotated in the direction of the arrow (j) during paper storage, the pulley (212), belt (25B),
The pulley (227) rotates, and the switching claw (225) is also urged in the direction of the arrow (r>), and is regulated by a stopper (not shown) and held at the solid line position in FIG. 2.Switching claw (225)
At this solid line position, the paper conveyed from the guide roller (210) is guided by the belt (225a) on its guide surface (225a).
40) and the scraper <228). On the other hand, when the guide roller (210) is intermittently rotated in the direction of the arrow (j゛) during paper refeeding, the switching claw (
225) is energized in the opposite direction to the arrow (r) through a similar path to 3[)-;
It is regulated by another stopper (not shown) and held at the two-dot chain line position, and the paper fed out from the bell 1- (240) is guided by the guide roller (210) on the guide surface (225a).
) and the pinch roller (216).

As described above, when the guide roller (210) is driven to rotate 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) held at the solid line position or the two-dot chain line position.

The scraper (228) is made of a rigid thin plate,
A resin-made visibility 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 thickness of the winding, 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 copy 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 position shown by the solid line, and moves the paper to the guide surface (<2zoa). and the rib-shaped guide portion <zotb) of the guide cover <201), and the guide roller (210
> and the pinch roller (215). The guide roller (210) is driven in normal rotation in the direction of arrow (j),
The pinch rollers (215) and (216) are driven to rotate. Therefore, the paper is conveyed around the guide roller (210) in the direction of the arrow (j>), and from between the guide plate (219) and the guide surface (225a) of the switching claw (225) that is fully set at the solid line position, It is conveyed downward between the straight part of the belt (240) connecting the idle roller (246) and the bobbin (230) and the scraper (228).The solenoid (SL4) is turned on and the gear (293) is moved to the gear (2).
53), and the leading edge of the paper is connected to the sensor (
After detection by SE2), the motor (
M3> is driven forward in the direction of arrow (0), and the bobbin (23
0) is rotated in the direction of arrow (m). In this way, the paper is wound onto the bobbin (230) together with the belt (240).

After the trailing edge of the paper is detected by SE'l, +- (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 bobbin (230) 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), a registration roller (330), <331), and the switching claw (220'). As described above, the registration roller (330) is rotationally driven in the direction of the arrow (S) via the clutch (CLI) (see FIGS. 4 and 5). The registration roller (331) is attached to the guide frame (3
25) and is rotatably attached to the registration roller (330).
) and rotates as a result. Guide frame (325)
is the support shaft (326) between the frames (101>, (111)
), and after releasing the guide frame (182) and guide cover (201), the paper re-feed path can be opened by rotating it in three directions.

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 sheets 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 single-sided copied paper 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 gear <293
) is engaged with the gear (251), the motor (M3>
is reversely driven in the direction of arrow (0')-11j, and the bobbin (2
35) can be rotated in the direction of arrow (m). 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 completely unwound from the bobbin (230) with the rear end in the storage direction leading.The paper moves in a straight line to the idle roller (245) of the belt (240). The paper rises while being guided by the scraper and the scraper <228>, and the moving direction of the belt (240) is abruptly changed by the idle roller (245), thereby separating it 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 (jo). Therefore, the paper is conveyed around the guide roller (210) in the direction of the arrow (jo), passes between the guy 1 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 activated by the clutch (CLI) just before the leading edge of the paper in the refeeding direction arrives.
The guide roller (210) and bobbin (235) continue to rotate. Therefore, the leading edge of the paper is moved by the 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 the sensor (SF3) and a timer.

Next, the clutches (CLI) and (Cl3) are turned off, and the motor (M3) is turned on, so that the registration roller (33) is turned off.
0).

(331), the guide roller (210) is rotationally driven, and the paper is moved through the guide frame (325) and the guide plate (32).
9), the paper refeed path (1) of the copying machine body (1) is
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 oblique 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 incorrectly based on the paper refeeding signal from the copying machine main body (1).

When all the sheets are fed out from the bobbin (230>), control is performed to rewind the belt (240) to the bobbin (235) and set it to the initial state.

(Countermeasures against curling of paper) By the way, in this embodiment, a reversing means for reversing the front and back of the paper using the ejection rollers (135) and (136) during composite copying is installed on the upstream side of the storage section (200). The paper winding direction (m) on the bobbin (230) in the storage section (200) is determined by
10) was set in the same direction as the rotation direction (,). This means that the direction of the curl formed on the paper when it is stored in the bobbin (230) is the opposite direction to the curvature of the photoreceptor drum (10) when the paper is re-fed and comes into close contact with the photoreceptor drum (10) again. This is to facilitate separation of the paper from the photosensitive drum (10).

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 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 up onto a bell l-<240) with the first side facing outward. 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). becomes.

[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 sheets (number set), A 7-segment display (65) for displaying the number of copies and the status of the copying machine, an 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,
A group of magnification selection keys 71) for selecting the copy magnification, a group of magnification display LEDs (72) for displaying the selected magnification.
>, Copy mode selection key (73) for selecting one-sided, two-sided, and composite copy mode, one-sided copy mode displayed E D (74), two-sided copy mode displayed L E
D (75) and a composite copy mode display LED (76) are provided.

"Control circuit" Figure 11 shows the control circuit of the copying machine.
A first microcomputer (8
0) and a second microcomputer 90) which controls the operation of the paper refeeding unit (100).

In the CPU (80), the switch matrix (81
), display section (65), various displays L E D <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)
.

73), a paper size and paper presence/absence detection sensor (Psi), (PS2), an attachment/detachment detection switch (MS) for the paper refeeding unit (100), etc. Also, on the output port of the CPU (80>),
A main motor (Ml), a developing motor (M2), a timing clutch, a paper feed clutch, an electrification charger, a transfer charger, etc. are connected.

The CPU (90) has a paper detection sensor (
SEL>, (SE2), (SE3), belt (240
) mark detection sensor (SE4>), guide cover (2
The open/close detection sensor (SE5) and forced ejection switch (SW) of 01) are connected, and the solenoids (SLI) to (SL5) and clutches (CLI>, (Cl3) that drive the paper conveyance system are connected to the output terminals. The motor (MS) that drives the bobbins (230) and (235)
) is the circuit (Ql) connected to the CPU (90),
(Q2).

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 and a speed signal from either the output terminal (PI) or (P2) are input. The terminal (circle) outputs a speed signal for driving the bobbin (235), and the terminal (P2) outputs a speed signal for driving the bobbin (235).
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.
Q2). 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 (Q2). The circuit (Q2) 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 (H3) can be set slightly higher than the paper transport speed when storing paper, and is set slightly lower when refeeding paper.

CPUs (80) and (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). From the CPU (90) to the CPU (80), a signal indicating the completion of storage of 4-day paper equivalent to the number of copies, a wait signal for waiting the copying operation, etc. are transmitted. Although omitted in FIG. 11, the CPU (80) is also connected to another CPU that controls the document scanning optical system (20), and is also connected to the sorter (40).
0> is installed, it is also connected to its control CPU.

[Control Procedure] Next, the control procedure of the copying machine main body (1) and paper refeeding unit (100) executed by the CPUs (80) and (90) will be described in detail with reference to FIG. 12 et seq. . By the way, in the following explanation, on-edge means that a switch, sensor, signal, etc. switches from an off state to an on state, and off-edge means that a switch, sensor, signal, etc. switches from an on state to an off state. means.

(Description of plugs 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 by the PU (80), step (512)
When the occurrence of a jam is detected in the jam detection/processing subroutine that can be executed, the set is completed, and when the jammed paper removal process is confirmed, it is reset. In the control by the CPU (90), when the occurrence of a jam is detected, it is set [
See step (S384)] and is reset upon completion of jam processing [see step (5392).

G-YAM A flag: When the power is turned on to the paper refeeding unit (100), it is displayed that the paper that the previous operator forgot to take out remains in the storage section (200) [Set in step (5234), step (5392).

(Reset with 5412>.

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

Copy flag: Displays that the copying machine main body (1) is in the process of copying [set in step (598), reset in steps (SLLL>, (5116>, (5120))].

Single-sided mode flag 2 Instructs execution in single-sided copy mode [Serra in steps (523) and (530)]...
Reset code in step (527).

Double-sided mode flag 2 Instructs execution of first side copy in double-sided copy mode [set in step (S27), reset in steps (S23) and (S29)].

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

Overprint paper flag 2 Instructs to feed paper from the upper cassette (30) [set at step (546>, (5412), reset at step (545), (5116))].

Sketch paper flag: Instructs to feed paper from the lower cassette (32) [Set in step (545), step (54)
6), reset with (5116)].

Paper refeed flag: Indicates that the copy process is for paper refed from the paper refeed unit (100) [
Set in step (5116), step (5120)
, (5366), (5407)].

Empty signal: Paper cassette (30), (32)
[Step (55)
5) and reset in step (551)].

Stop flag: Instructs to temporarily stop the subsequent copy operation during the copy operation [step (553),
(S66), set in (5101), step (5
58).

(564), (596) to reset].

Determined Flag 2 Number of copies per original (number of copies) and storage unit (200) when duplex or composite copy mode is selected
"Set in step (580), step (574), (
S83) to reset].

Copy operation permission flag 2 Indicates that copy operation is possible without any problem. 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 Bell 1- (240) has been wound up to the end on the bobbin (230), and prohibits further operation [set in step (5303), steps (5116), (5412) ) to 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: Set when the number of sheets (number of copies) is stored in the storage section (200) [step (
5310) ], is reset when all the sheets have been ejected from the storage unit (200) [step (5308)
, (5363), (5412> ].

Preprocessing flag 2 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 the belt (240) has returned to its initial position [step (5249).

Set at step (5255) and reset at step (5310).

Drive request signal: Main motor (
Ml) [Step (5227), (
5293).

(5323), (5407) set, step (S
249), <5255>.

(5310), (5329), <5409)].

Winding flag: When returning the heald (240) to the initial position, it is displayed that the standby mark (242) and overrun mark (241) are detected by the sensor (SE4) [steps (524, 6), (5252
), set at (5254), step (5249),
(5255) to reset 1~].

Position A flag: Displays that the region (L2) of the belt (240) is located at the detection point of the sensor (SE4) [Set in step (5246), step (S249)
) to reset].

Position B flag: Indicates 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 refeeding flag: Indicates that paper is being refeeded [Set in step (5323), step (5
329), reset with (5363)].

Conveyance permission signal: Permits paper to be sent out from the paper refeed unit <320>.

Ejection flag: Operator stores paper in storage section (200)
Displays that the operation of discharging directly to the outside has been selected [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 the CPU (80) is powered on, step (5)
1), a reset is applied and the random access memory (R
AM), 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 the jam flag is "0." If it is set to "1", the process immediately moves to step (512); if it is reset to "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), 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 (SIO), when the duplex or composite copy mode has been 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 the occurrence of a jam is detected, the jam flag is set to 11. Reset. In step (513), cPU (9
0) etc.

After calling each of the above subroutines, step (514
), wait for the internal timer to finish counting, and then proceed to step (S4).
).

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 h (100) has been completely reset to 0, it is determined in step <522) whether the refeeding unit h (100) is fully installed or not based on the on/off signal from the microswitch (MS). If it is not attached, turn on LED (74) in step (523), set the single-sided mode flag to 11'', and turn on LED (75).
(76) is turned off, the duplex mode flag and the composite mode flag are reset to "o", and this subroutine ends. On the other hand, if it is installed, 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 "0". 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 copying and composite copying, the steps from step (S26) onwards are executed to switch the copy mode. The copy mode is initially set to one-sided copy mode, and can then be switched to duplex, composite, or one-sided in rotation.

That is, in step (S26), the single-sided mode flag is rl.
”, and if it is set to “1”, in step <527>, the LED (74) is turned off and the LED (
75), the one-sided mode flag is reset to r□, and the two-sided mode flag is set to "1".

When the single-sided mode flag is reset to "0", it is determined in step (528) whether the double-sided mode flag is "1", and if it is set to "rl", step (528) is performed.
29) to turn off L E D (75) and turn off L E D
(76) and set the duplex mode flag to "0".
, and set the composite mode flag to 11.

When both the single-sided mode flag and the double-sided mode flag are reset to 10, 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 "rO", 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 not been reset to "0", step (541) is performed.
After confirming that the copy flag is reset to "O" in step 542), press 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 (544) that the overprint paper flag is "1yo", the overlay paper flag is reset to "0" and the unfeeding paper flag is set to "1yo" in step (545). On the other hand, if it is determined in step (S44) that the overprint paper flag is "0", the unfeed paper flag is reset to "rO" and the overprint paper flag is set to "11" in step (S46). Thereafter, the size of paper stored in the paper feed section selected in step (548) is displayed on the LED group <70). Step (542).

This step (54) also applies when the determination is NO in (543).
8) Process.

On the other hand, the paper refeed flag is set to "1" in step (541).
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 "O" in step (551). On the other hand, if there is no paper, step (552)
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 (553) to instruct a temporary stop of the subsequent copy operation, and step (554)
The set number (the set number of copies) is stored in the RAM. Furthermore, in step (555), the empty signal is
1”.

If it is determined in the step (S49) that the empty signal is on-edge, that is, if paper is replenished, the original number stored in the step (554) is again substituted for the set number. Then, in step (S57), the number of copies missing at this time is calculated, and in step (ss8), the stop flag is reset to "0." to enable restart of the copying operation.

FIG. 15 shows the clear/stop switch (63) executed in step (S9) of the main routine of the CPU (80).
) shows a subroutine that determines the status of

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

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

(2) When the print switch (61) is turned on after being turned on for the first time, 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. .

) Paper is replenished in the paper feed section, and the print switch (61
) is turned on, the first side copying 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 "11". If it is set to "1", Step (563)
If it is determined that the copy flag is 101, that is, if the copy operation is not in progress, the stop flag is reset to "0" in step (S64), and the copy conditions are initialized in step (568).

When the stop flag is "0" [NO in step (562), the copy flag is r□ in step (565).

If it is determined that this is the case, the step (568) is processed. If the copy flag is set to "1", that is, if the copy operation is in progress, the stop flag is set to "1" in step (566), and the set number ( number of copies) is stored in RAM.

FIG. 16 shows a subroutine for determining permission for a copy operation that can be 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 (the copy flag is "O"), the following steps are processed. In step (572) it is determined whether the single-sided mode flag is "0" or not, and in step (573) it is determined whether the paper refeed flag is "0" or not. If either one is set to "1", that is, , if the single-sided copy mode has been selected or if the transition has already been made to the paper refeeding copy operation, the determined flag is reset to "rO" in step (S74), and the process returns to step (579).
) sets the copy operation permission flag to 11''.

On the other hand, if YES in both steps (572) 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). It is determined whether or not is r□. If it is reset to "0", step (576
), calculate the length L5) of the paper selected in the transport direction, and
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)] L5: Length in the transport direction of the stored paper (j4 L6: Belt < 240) The information in (L4) and (L6) is the interval between sheets when storing sheets 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 specified number, the copy operation permission flag is set to ``rl'' in step (S79). If N is a numeric value, the copy operation permission flag is reset to "0." in step (580) 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 step 3), reset the determined flag to 10.

FIGS. 17a and 17b show a copy operation subroutine executed in step (511) of the main routine of the CPU (80).

First, in step (591), it is determined whether the copy flag is "0" or not. If it is reset to '0', that is, if it is turned off during the copy operation, then in step (592), the copy flag is set to "0". When on-edge is detected, it is confirmed in step (S93) that the copy operation permission flag is set to "1" and that the empty signal is reset to "10" in step (594). , In step (595), it is determined whether the stop flag is "1." If the stop flag is set to "1", the stop flag is set to 10 in step (596).
'', and in step (597), the original value stored in the numeric value is substituted, and in step (598), the copy flag is set to 11''. If it is determined in step (S95) that the stop flag is "0.", immediately step (598) is processed.

Next, in step (S99), it is determined whether the copy flag is "1.", and if it is reset to rO, 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 in step (5101) the stop flag is set to "11", and in step (5105) the paper is currently being fed. The paper feeding operation is stopped after the paper feeding is completed. Also, step (5100
), if it is determined that the paper feed prohibition signal is "r□", it is determined in step (5102) whether the stop flag is "11" or not, and if it is set to "rl", 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, in the step (5102), the stop flag is set to "
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 "o", the predetermined cassette (30) or ( The paper feeding operation from step 32) is executed, and the process moves to step (5108). Paper feed wait signal is 11"
If it is set, the process immediately moves to step (5108)=67.

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 "1".
．． 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 of the numeral bone has been completed. , upon completion, 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 "0", that is, if copy processing is in progress in duplex or composite copy mode, it is determined in step (5112) whether the paper refeed flag is "0" or not. Determine. If it is reset to "0", that is, when copying to the first side,
In step (5113), it is confirmed that the copying of the input frame has been completed, and in step (5114) it is determined whether or not the paper presence signal is on-edge. If it is on-edge, that is, the storage part (
200), when the number frame sheet is stored in step (200), step (
5115) to store the selected paper source and its paper size in RAM.
to be memorized. Furthermore, in step (5116>), the main paper feed flag and sketch paper flag are reset to "0", the paper refeed flag is set to "11", and the copy flag and paper feed prohibition signal are each reset to "0". and ends 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 10 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 11'' in step (5119). Further, in step (5120), the paper refeed flag and copy flag are reset to "rO", 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 (52)
01), the random access memory (
Clears RAM), initializes registers, timers, counters, etc., and performs initial settings to put each device into initial mode. Next, in step (5202) the CPU (
80), and when the end of the initial communication is confirmed in step (5203), an internal timer is started in step (5204). This internal timer is
It has the same functions as the main routine of the PU (80).

Next, in step (5205), the jam flag is set to rO.
Determine whether or not. If it is set to '1', the process immediately moves to step (5209), and if it is reset to 'rO', each subroutine of steps (5206) to (5209) is called.

Step (5206) processes the operation of returning the belt (240) to the initial position before the paper feeding operation starts in the copying machine main body (1>).In step (5207), the paper is transferred to the paper output tray (175) or to the sorter. The operation of discharging the paper to (400) and the operation of storing it in the storage section (200) are processed. In step (5208), the operation of refeeding the sheets one by one from the storage section (200) is processed. Step (5209) Then, 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, if an interrupt request is received from the CPU (80) during processing by the CPU (90), the CPU
(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 "1" or not, and if it has been reset to "0", the process moves to step (5225), and if it has been fully set to "1", step ( 5222), it is determined whether the paper presence signal is off-edge. 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 (
5223), the preprocessing flag is set to rl, and the process moves to step (S225). If the paper presence signal is not off-edge, the preprocessing flag is set to 11 in step (5224).
”, and 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 10. If it is set to "1", the belt (240) has already been rewound to the initial position, so the process immediately moves to step (5231). If the standby flag has been reset to "0", step (522
After confirming that the drive request signal is reset to 10'' in step 6), the drive request signal is reset in step (5227).
Set the paper feed weight signal to "1" and turn the motor (M3
) in the belt rewinding direction. At the same time, the state counter that can be used in the following step (5230) is set to "0".
．． and start timer A and trouble timer. Here, the bobbin (235) is rotationally driven in the direction of the arrow (m>), and the bell (240) is rotated in the direction of the arrow (m>).
5). Timer A will be explained in the subroutine of step (5230) (see FIG. 20). The trouble timer is used to detect 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 (S229), 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), the paper refeed flag is set to 71. Determine whether or not. If it is set to "1", then in step (5232) the paper is forcibly ejected from the storage unit (200) according to the operator's selection.

If the paper refeed flag has been reset to r□, it is determined in step <5233) whether the sensor (SE3) is turned on. If the sensor (SF3) is turned on, it is determined that the paper presence signal is reset because the power was turned off before or during the copying process to the second side, and the paper presence signal is reset in step (S234). ~Set the program A 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 (S227) is performed during preprocessing.
, (S229) executes control to turn off the driven motor (M3). The values of timers A and B used here are set under the following conditions.

Timer A > L2/V...
...■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 here is performed in step (5241) when the sensor (
Each time SF4) detects marks (241) and (242) and becomes on-edge, it increments the state counter in step (5242), 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 (
When the first on-edge of SF4> is detected, it is determined in step (S244) whether or not the winding flag is "O". If it is reset to "0", step (524) is performed.
In step 5), it is determined whether timer A has finished counting. If the count is completed, the belt (240) is activated by the sensor (SF) before the motor (M3) is driven in the rewinding direction.
It can be determined that the position facing the detection point 4) was on the downstream side in the rewinding direction from the standby mark (242) [within the range of region (L4)]. In other words, the sensor (SF
The point where the first on-edge is detected in step 4) can be determined to be the standby mark (242), and the point at which the first on-edge is detected in step (524)
6) Turn off the motor (M3) and set the winding flag to position A.
Set the flag to ``1'' and reset the state counter to 0''.

If timer A has not finished counting, the bell 1-(
240) facing the detection point of the sensor (SF4) 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 that the winding flag is "1" in step (5244>), then in step (5248) it is confirmed that the position A flag is set to "1", and in step (5249) the motor is (M3) is turned off.This stops the rewinding operation of the belt (240).At the same time,
The winding flag and position A flag are reset to "rO", the standby flag is set to "71", and the state counter is reset to "0". In addition, the solenoid (S
L4>, (SL5) is turned off, and the drive request signal, paper feed wait signal, and preprocessing flag are reset to 10.

After starting timer B in step (5247>), if the value of the state counter reaches 2''', that is, if the second on-edge of the sensor (SF4) is detected,
After confirming that the winding flag has been reset to "0" in step (5250), proceed to step (5251).
It is determined whether timer B has finished counting. If the count has ended, wait for the third on-edge of the sensor (SF4), and if the count has not ended, the position where the belt (240) was facing the detection point of the sensor (SF4) is in the area (L2). ), and 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 "1" 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 reaches "3", that is, if the third on-edge of the sensor (SF4) is detected, the process proceeds to step (5253). ), it is determined whether the winding flag is rO. rO”, turn off the motor (M3) in step (5254),
The winding flag and position B flag are set to "1" and the state counter is reset to "0". On the other hand, if the winding flag is set to "1", the "step" (525
5) 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 "0", and the standby flag is set to "1". Further, the state counter is reset to "0", and the drive request signal, paper feed wait signal, and preprocessing flag are reset to "O".

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) whether the single-sided mode flag is "1" or not, in step (5282) whether the paper refeed flag is "1" or not, and in step (5284>) whether the duplex mode flag is "11" or not. is determined, and 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 (S284)], step (
In step 5285), 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 (52)
In step (5286), the paper is switched back by the discharge rollers (135) and (136) to turn the paper upside down, and then transported to the storage section (200) in step (5286).
In step (5287), the paper is stored in the storage section (200).

Note that steps (5283), (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 or not the copy flag is "rl". If it is reset to "rO", the process moves to step (5296), and if it is set to "1", the main body is transferred to step (5292). When the on-edge of the ejection signal is confirmed, that is, when the leading edge of the copied paper reaches the ejection section of the copying machine 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 lobby 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.
Timer C and jam timer A, which determine the drive start timing, are started. Now the guide roller (210)
is rotated in the direction of the arrow (j>), and the 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)
(7) Detect the end mark (243) and
40) has been wound up to the terminal end, and step (
5303), the paper feed prohibition signal is set to 11'', and subsequent paper feeding operations are prohibited.

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, paper is replenished in the paper feed section that ran out of paper on -1, so the error occurred in step (5308).
SL4), (SLY) OJ'/L, paper signal is reset to OJ, 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 not off-edge, the copy flag is set to "
1", and if it is set to "1", after the clear/stop switch (63) is turned on once,
It is determined that the copy operation has been resumed, and the step (
5308) and moves to step (5309). If the copy flag is 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 "1" or more.・If it is 1゛ or more, step <
5312), the accommodation counter is reset to "0". If the count value is "0", this subroutine ends immediately.

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 "rO". Furthermore, step <5
After confirming that the stop flag has been reset to "0" in step (311), the accommodation counter is reset to "0" in step (5312), and this subroutine is ended.

Figures 23a, 23b, and 23c are CPU (90)
A subroutine for paper refeeding operation executed in step (5208) of the main routine is shown.

First, in step (5321), it is determined whether or not the paper refeed flag is 11'', and if it is reset to 0, this subroutine is immediately terminated. rl", it is determined in step (S322) whether the copy flag is on-edge, and if it is on-edge, the copy flag is set in step (5323).
), set the paper refeeding flag and drive request flag to "1", reset the state counter to "0", and proceed to step (
5325). After that, in step (5324), it is determined that the paper refeeding flag is "1", and then step (
5325). In step (5325), the current status of the state counter is checked, and depending on the count value, the motor (M3), clutch (CLI>,
(CL2) etc.

In the initial stage when the count value of the state counter is reset to "0"', it is determined in step (5326) whether the transport permission signal is "1" or not. ``If it is set to 0yo, move to step (5360) and set to ``1''.
If the stop flag is set to "0", it is determined in step (5327) whether the stop flag is "0" or not. r□", prepare to refeed the paper. That is, timer F determines the interval between sheets to be re-fed in step (5328).
is started and the state counter is set to "1"'. If the stop flag is set to rl, the paper refeeding operation is temporarily stopped =84-. Therefore, in step (S329), the copy flag, paper refeeding flag, and drive request flag are reset to "0", and the motor (M3) is turned off.

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 set to "1", the process is performed in step (5331).
The timer F continues counting at step <53.
32) drives the motor (M3) in the rewinding direction, turns off the clutch (CLI), turns on the clutch (CL2), and sets a jam B timer for detecting the occurrence of a jam in the paper refeeding section (320). and state counter “
2”. Now the registration roller (330)
, (331) are stopped, and the guide roller (210) is reversely driven in the direction of the arrow (j'), and 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 count value of the state counter is "2", it is determined in step (5334) whether the transport permission signal is "rl", and if rl is set, the timer F and jam timer B are set in step (5335). continue counting,
In step (5336), the clutch (CLI) is turned off and the motor (M3) is allowed to continue driving in the rewinding direction, and the process moves to step (5339). Transport permission signal is 1
If reset to 0, the timer F and jam timer B are stopped in step (5337), and the clutch (CLI) is stopped in step (5338).
Turn on to stop the guide roller (210) from reversing,
Turn off the motor (M3) and proceed to step <5339.

Next, when the on-edge of the sensor (SE3) is confirmed in step (S339), that is, when the leading edge of the paper fed out from the bobbin (230) is detected by the sensor (SE3), in step (5340), the Reset jam timer B and install new 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 value of the state counter is "3", it is determined in step (5341) whether or not the transport permission signal is "1", and if it is set to "1", step (S342) is performed.
) to continue counting the jammer F1 timer G1 and jam timer C, and in step (5343) the clutch (C
LI) 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 1 timer G2 and jam timer C is temporarily stopped in step (5344), and the count of the jam timer C is stopped in step (5344).
45) to turn on the clutch (CLI) and turn on the motor (M3).
is turned off and the process moves to step (5346). Next, when it is confirmed in step (5346) that the timer G has finished counting, in step (5347) the clutch (CLI) is turned on, the motor (M3) is turned off, and the state counter is set to "4". Now, transfer the paper to the bobbin (
The feeding operation from 230) is temporarily stopped, and the leading edge of the paper comes into contact with the nip portion of the registration rollers (330) and (331), forming a slight loop.

It is determined whether or not the conveyance permission signal is 11 in step (5348) when the current value of the state counter is "4pa", and if it is set to rl, step (S349) is performed.
In step (5350), the count of the timer F1 jam timer C is continued and the process moves to step <5351). (
5351). Next, when it is confirmed in step (5351) that the timer F has finished counting, in step (5352) the motor (M3) is restarted to be driven in the rewinding direction, and the clutches (CLI) and (CL2) are turned off. and sets the state counter to "5'".

As a result, the guide roller (210) is reversed in the direction of the arrow (j'), and the registration rollers (330), (
331) is fully driven, and the paper is fed out from the paper refeeding section (320).

When the current count 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 set to "1", step (5354) is performed.
) to continue counting the jam timer C, and in step (5355) to continue driving the motor (M3) in the rewinding direction and keeping the clutches (CLI) and (CL2) in the off state, and then proceed to step (5358). do. If the transport permission signal is reset to "0", step (53
56), the count of the timer C is temporarily stopped, the motor (M3) is turned off in step (5357), the clutch (C1l>, (CL2) is turned on, and the process moves to step (5358).Next. , step (S3
When the off-edge of the sensor (SE3) is confirmed in step 58), that is, when the trailing edge of the paper is detected by the sensor (SE3), the jam timer C is reset and the state counter is set in step (5359). It is reset to "0". This means that one sheet of paper has been re-fed from the storage section (200) to the re-feed path (40) of the copying machine main body (1).

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) reaches the end. If it is determined that the process has been rewound, 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 (S36
In step 2), 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 in step (5364) that the stop flag is off-edge, and the step If it is determined in step (5365) that the copy flag has been reset to "O", the paper refeed flag is reset to "0" in step (5366). On the other hand, in the step (S362), the timer G
When the end of counting is confirmed, step (S363)
Reset the paper presence signal to "0" with motor (M3),
The clutches (CLI) and (Cl3) are turned off, the paper refeeding flag is reset to "0", and the 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 "0" 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 “0”, step (53)
73), (S375), and (5377) 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).

(S3'76), (5378) sets the jam B flag to "
1" and moves to step (5383). Further, in step (S379), a trouble timer is set [step (5227)].

(See S229)], and if the count is confirmed to be completed, the sensor (SF3) 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) did not operate normally, and in step (5381) the jam B flag is set to ``1'', and the process moves to step <5383).On the other hand, if there is input, step ( In step S382), the trouble timer is reset and this subroutine is ended.

In step (S383), the jam signal is sent to the CPU (80
) After sending the 9th call to ), set the jam flag to `` in step (5384).
1”. The jam signal is processed by the CPU (80) and displayed on the display section (65) of the operation panel (60). Furthermore, in step (5385) it is determined whether the jam flag is "1" or not, and if it is set to "1", 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 <
5385), the jam B flag is set to 11.
'', 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 opening and closing of the guide cover (201) is controlled by the sensor (
SF5) and when the off-edge of the sensor (SF5) is confirmed in step (5390), it is determined that the jammed paper was incorrectly removed and the guide cover (201) was closed, and a jam signal is sent in step (5391). Reset.

Furthermore, in step (5392) all jam flags,
Reset the jam timer and end this subroutine.

FIG. 25 shows the steps (S) in the preprocessing subroutine.
232) or the forced ejection subroutine that can be executed in 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 flag is set to "1".
In step (5402), it is determined whether the paper presence signal is rlj, and in step (5403) it is determined whether the copy flag is "0". Forced ejection of paper can only be executed when the jam flag is set to "rl" or when the paper present flag is set to "1" and the copy flag is reset to "rO". If it is executable, step ′, step (54,
After confirming that the discharge flag is reset to "rO" in step 04), the sensor (SE
5) is turned off, and step (54) is performed.
06), it is determined whether the switch (SW) is on-edge. The sensor (SE5) is turned off when the guide cover (201) is opened. Therefore, unless the sensor (SE5) is turned off, this subroutine ends. The switch (SW) is operated by the operator, and when the on-edge is confirmed, the drive request signal is set to "11" and the copy permission signal is reset to "0" in step (5407). 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 completely unwound from the belt (240), and as shown in FIG.
10) The paper is discharged from the pinch roller (216) onto the guide cover (201).

Next, in step (5408), it is determined whether the sensor (SE4) is on-edge or not. If it is on-edge, immediately
When the standby mark (242) of the belt (240) is detected by the sensor (SE4), it is determined that the rewinding of the bell 1- (240) is completed, and the drive request signal is reset to "rO" in step (5409). At the same time, the motor (M3
) off. Furthermore, after confirming that the discharge flag is set to "1" in step (5410), it is determined in step (5411) whether the sensor (SE5) is on-edge. The guide cover (201) is closed,
When the sensor (SE5) is on-edge, step (5)
412>, sets the copy permission signal to "1", resets the discharge flag and jam flag to "10", sets the overprint paper flag to "1", and sets the paper presence signal and paper feed prohibition signal to "0". ” and exit this subroutine.

"Second Embodiment" In the above-mentioned 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 In the subroutine (see Fig. 20) for belt drive stop processing executed at
Timer A and timer B were used to detect the amount of movement. If the moving speed of Bell +- (240) is not constant,
The pulse signal of the sensor (SE7) that motors the driven rotation of the idle roller (246) [corresponding to the amount of movement of the belt (240)] may be used in place of the timers A and B. 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 above, and FIGS.
Control is performed based on the flowcharts shown in FIGS. 25 and 26 instead of the flowchart shown in FIG. 20.

Here, the pulse count of the sensor (SE7) is started in step (5227') and step (S247'), and in step (5245') it is determined whether the pulse count is larger than the reference value (Na) or not.
), 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: Bell per pulse (240)
Is the pitch of the moving distance L1 Niover run mark (241) over the L2 Ni standby mark (242)? Distance from the run mark (241) [hereinafter referred to as margin] Effects of the Invention As is clear from the above explanation, according to the present invention, when the cover member that can open and close the paper feeding unit is opened, the paper that is fed out from the paper storage unit is Since the paper is configured to be discharged onto the cover member, the remaining paper that has been wound around the belt can be easily and directly discharged from the machine by unwinding the belt. In addition, there is no need for a special ejection passage or ejection tray, and the paper can be ejected quickly and the structure is simple.

[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, 14b, 15, 16, and 17a.
Fig. 17b, Fig. 18, Fig. 19, Fig. 20, Fig. 2
District 1, Figure 22a, Figure 22b, Figure 23a, Figure 23b
23c, 24a, 24b, and 25 are flowcharts showing the control procedure, respectively. Second
6 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 part, (180)
...Intermediate conveyance section, (200)...Paper storage section, (2
01)...Guide cover, (210)...Guide roller, (230), (235)...Bobbin, (24)
0)...Paper storage belt, (320)...Paper refeed unit, (SW)...Forced ejection switch, (SE5)...
Open/close detection sensor.

Claims (1)

[Scope of Claims] 1. The paper ejected from the image forming apparatus main body can be fed into the image forming apparatus main body from the paper accommodating part after being accommodated in one paper accommodating part, and the paper ejected from the image forming apparatus main body is Belt winding includes a belt that is stretched between shafts and is wound back and forth, and when the belt is wound around one shaft, the paper is wound together with the belt around the shaft, and the belt is wound around the other shaft. In a paper winding type refeeding device that feeds out the paper that has already been wound up when picking up the paper, a cover member that can open and close the paper feeding portion of the paper storage unit is installed, and when this cover member is opened, A paper refeeding device characterized in that the paper fed out from the paper storage section is discharged onto a cover member.