JPH02222968A - Paper refeeding device - Google Patents

Abstract

PURPOSE:To forcedly eject useless paper alone to the outside of a machine by ejecting paper in a paper containing part without forming an image thereon when either a paper jamming signal or a signal indicating the presence of paper is set. CONSTITUTION:In setting the paper jamming signal, it means that paper stored in a containing part when previous copying is performed remains in the case of turning on a power source. Conversely, in setting the signal indicating the presence of paper, it means that copying is carrying out on the 2nd surface with a refeeding paper. Consequently, paper remaining in the containing part is not required for subsequent copying. By such a reason CPU 90 setting the paper jamming signal and the signal indicating the presence of paper and a CPU 80 controlling the ejection of paper in the paper containing part without forming an image are provided when either of those signals is set. Consequently, the CPU 80 discriminates whether or not paper is forcedly ejected, and only when it discriminate so, the paper is ejected to the outside of the machine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a paper refeeding device, particularly a copying machine, a copying machine, a laser printer, etc.
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.

Conventionally, this type of paper refeeding device stores sheets of single-sided copied paper stacked in a flat state in a tray installed approximately horizontally or vertically, and then feeds the sheets one by one from the tray. (refeed).

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

Therefore, US 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. Pat. 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 be careless and put unnecessary paper into the belt, or if the previous paper is left in the belt when starting the flip. It is processing. Such inconveniences can occur if: ■ The previous operator forgets to remove the paper from the paper refeeding device; ■ If the previous operator accidentally selects duplex/composite copy and executes the lobby process for the first side; ■ If the paper is being stored This occurs when the device is turned off, 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 remove paper that has been wound around the belt and remained in the storage section due to incorrect mode settings or forgotten paper refeeding in a paper winding type paper refeeding device.
Reliably determines whether or not the paper should be forcibly ejected,
The purpose is to allow paper to be ejected outside the machine only when the paper should be ejected.

In order to achieve the above-mentioned problems, the paper refeeding device according to the present invention has the following features: (b) When a predetermined number of sheets of paper that has been folded on the first side are stored in the paper storage unit in the duplex copy mode or composite foldable mode, and when paper is stored in the paper storage unit, the duplex a paper presence signal that is set when the copy mode or composite copy mode is canceled and is reset when all the stored paper has been re-fed for second side copying;
(c) a control unit capable of ejecting the paper present in the paper storage section without performing image forming processing when at least one of the paper jam signal and the paper presence signal is set; shall be.

That is, when the paper jam signal is set, it is the case that the paper stored in the storage section during the previous copying process remains when the power is turned on. Further, when the paper presence signal is set, copy processing to the second side by paper refeeding is in progress, and if the copy processing is interrupted midway through, the paper presence signal remains set.

Therefore, if at least one of the paper jam signal and paper presence signal is set, the paper remaining in the storage unit at that time is, so to speak, unnecessary paper for future copy processing. Therefore, in the present invention, it is possible to eject the paper to the outside of the machine without performing an image forming process, only when there is no paper remaining in the storage unit to be forcibly ejected.

Note that the actual discharge operation is preferably based on an operator's turn-on operation of a discharge instruction means (switch). In addition, the forced ejection mode includes a mode in which the cover member of the paper refeeding device is opened and the paper is directly discharged from the opened part, or a mode in which the paper is discharged outside the machine through the paper passing path of the main body of the image forming apparatus. There is.

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

As shown in FIG. 1, the paper refeeding unit (100), which is an embodiment of the present invention, is located on the right side of the copying machine main body (1) where a paper ejection section and a refeed paper receiving section are formed. A sorter (400) is detachably attached to the right side of the paper refeeding unit (100).

[Schematic structure and operation of copying machine main body] The copying machine main body (1) is equipped with 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 the arrow (Jl), and around it are a main eraser lamp (11), a sub charger (12), and a sub eraser lamp (13). ), main charge charge ~ (14)
, a magnetic brush type developing device (15), a transfer charger (16), a paper separation charge (17), and a cleaning device (18). Photosensitive drum (1
0) is sensitized and charged by passing through eraser lamps (11), (13) and chargers (12), (14), and then subjected to image exposure from the direction of arrow (b) in the scanning optical system (20). 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 horizontal paper is placed in the lower cassette (30).
2) contains sheets of B5 size horizontally arranged paper. The sizes of copy paper that can be accommodated in each paper cassette (30) and (32) are as follows: cassette (30), <3
2) is connected to the sensor (Psi) provided on the copying machine body (1) side, (
PS2> and is identified based on a pre-assigned code. At the same time, the sensor (Psi >,
(PS2) also detects the presence or absence of paper in the cassettes (30) 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).
), and is guided to the timing roller (35) by a guide means (not shown), where it is temporarily stopped. The copy paper once stopped is sent to the transfer section in synchronization with the image formed on the photosensitive drum (10). Next, the toner image is transferred by discharge from the transfer charger (16), and the toner image is transferred from the separation charger (17).
It is separated from the surface of the photoreceptor drum (10) by C discharge.Then it is transferred to the fixing device (37) via the conveyor belt (36).
), and after the image is fixed, the discharge roller (38)
, (39), and is passed to a paper refeeding unit (100), which will be described later. After the transfer, the photosensitive drum (10) is cleaned of toner and electric charge remaining on its surface by a cleaning device (18) and an eraser lamp (11), and is ready for the next copying process.

On the other hand, at the bottom of the copying machine main body (1), there is a paper refeed unit (
The paper re-fed from the timing roller (3
A refeeding path (40) is provided, which includes rollers (41), (42>, etc.) for conveying the paper to 5>.

Paper is transported from the paper refeed unit (100) to this path (4) with the image side that has already been copied facing up during duplex lobby, and with the front and back sides reversed and facing down during composite copying.
0), is again supplied to the timing roller (35), and reaches the aforementioned transfer section.

By the way, the main motor (Ml) is connected to the paper feed roller (31
), (33), timing roller (35), conveyor belt (36), fixing device (37), discharge roller (38),
(39) Also drives the paper transport system of the paper refeed path (40) and the paper transport system in the paper refeed unit (100), 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 the paper that has been completely ejected from the copying machine main body (1) and switches the paper feed format as appropriate according to the copy mode, and temporarily stores paper that has been copied on one side during duplex/composite copying. Winding paper storage section (2
00), an intermediate conveying section (180) that feeds the paper to the paper storage section (200), and a conveyance section (180) that feeds the paper stored in the paper storage section (200) one by one to the paper refeed path (40). and a refeeding section (320) for feeding the paper. Whether or not the paper refeed unit)-(1 (Xl) is installed in the copying machine body (1) can be determined by the on/off signal of the ficro switch (MS) installed on the copying machine body (1). Detected.

The paper refeeding unit (100) also includes a paper output tray (1
75) or a sorter (400) can be selectively installed. Figure 2 shows a state in which a paper output tray (175) is installed, and Figure 1 shows a state in which a sorter (400) is installed. Multiple bins (410
). When using this sorter (400>), the topmost bin (410) functions as a paper discharge tray during non-sorting.

[Paper passing switching section - The paper passing switching section (120) has 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 (125e) 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 (125e) to serve as a paper guide. This flexible film <129) has a guide plate (123) at the tip.
The paper sheet conveyed from the left side in FIG. The guide surface (125c) has a guiding function.

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

Another switching claw (130) includes a guide surface (130a) that guides the paper toward the paper output tray (175) or the sorter (400), and an arcuate guide surface (130a) that guides the paper toward the right side of the unit (100). 130b), and the frame (101), (1
11) It is rotatably mounted in between. This support shaft (13
1) is similar to the switching claw (125) in FIGS. 6 and 7.
As shown in the figure, it is connected via an arm <132) to the plunger of a solenoid (St2) provided on the front frame (101). The switching claw (130) is a solenoid (S
When solenoid (t2) is turned off, the solenoid (
When St2) is turned on, it is set to the solid line position.

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

The paper discharge tray (175) is supported at one end by a support plate (176). Ejection rollers (135), (136)
The trailing edge of the sheet discharged from the paper is regulated and aligned by a regulation Fi (177). Note that when the paper ejection tray (175) is attached and reloaded, the switching claw (130) is removed from the unit (100), and when the sorter (400) is loaded, the ejection tray (175) and the switching claw (130) are removed from the unit (100). Support plate (176
) is removed and a switching claw (130) is attached in its place.

On the other hand, the guide plate (123) has a photo sensor (SEL).
) is attached via a bracket (133).

In this sensor (SEI), an actuator (134) projects into a conveyance path formed by a guide surface (125a) of a switching claw <125> and a guide plate (123), and detects a sheet passing through the path.

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

A bracket (141) and a timing pulley (142a) are attached to the support shaft (140) fixed to the back frame (111).
), a gear (142b) are rotatably mounted, and the boot 1 bar 142a) and gear (142b) are integrally rotatable. The bracket (141) has a gear (144),
(145) and (146) are respectively rotatably mounted, the gear (144) meshes with the gear (142b), and the gear (145) meshes with the gears (142b) and (146). Support shaft (137) of upper discharge roller (135)
A gear (138) is fixed to the end of the gear.

The bracket (141) is biased in the direction of arrow (C) by a fill spring (147), and is connected to the plunger of a solenoid (SL3) fixed to the back frame (111) via a lever (148). The connection is broken. When the solenoid (SL3) is turned off, the bracket (1
41) 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 the gear (13g) instead of the gear (146).

A timing belt (151) is stretched between the timing pulley (142a) and other timing boots 150a) and (195a). Timing pulley (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 integrally 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 fixed to the end of the support shaft (192) of the intermediate conveyance roller (190).

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, the gear (50) is driven by the main motor (Ml).
is constantly driven to rotate in the direction of arrow (d), and this rotation is transmitted to gears (155), (150b), and driver 150a>, thereby rotating the timing belt (151) in the direction of arrow (e). Kira, this rotation is caused by a solenoid (SL3
) is turned off, the pulley (142a) and gear (
142b).

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

(135a) is reversed in the 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 solid line position in FIG. 2 by 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 by the timing belt (151) in the same direction (arrow (e) direction), 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 feeding switching unit and intermediate conveyance unit) 2nd position in single-sided copy mode and duplex/composite copy mode
When paper is ejected after copying to a surface is completed, the solenoids (SLI) and (SL2) are turned off, and the switching claws (125) and (130) are held at the positions indicated by the dotted chain lines in FIG. Further, the solenoid (SL3) is also turned off and the discharge rollers (135) and (136) are driven to rotate in the normal direction. When the sorter (400) is disconnected, the paper sent from the ejection rollers (38), (39) of the copying machine main body (1) to the paper feed switching section (120) is transferred to the guide plate (
123), the guide surface (125a) of the switching claw (125)
), while being guided by the guide surface (130a) of the switching claw (130), a conveying force is applied by the discharge rollers (135) and (136), and sent to the sorter (400). When the paper output tray (175) is installed, the switching claw (
130) has been removed, and the paper is delivered to the ejection roller (13
5), the paper is directly discharged from (136) onto the paper discharge tray (175).

When the paper that has been copied on the first side is ejected from the copier main body (1) in double-sided copy mode, the solenoid (SLI)
) is turned on, the switching claw (125) is set to the solid line position, and the paper is guided between the upper part of the guide plate (181) and the arcuate guide surface (125b) of the switching claw (125), and is conveyed intermediately. The paper is sent from the roller (1901 (191) to the paper storage section (200), which will be described in detail below.

On the other hand, when the paper copied on the first side is ejected from the copying machine main body (1) in composite copy mode, the solenoid (
SLI: ) is off, solenoid (SL2) is on,
The switching claw <125) is at the two-dot chain line position, and the switching claw (130
) is set to the solid line position. In addition, solenoid (SL)
3) is initially turned off, and the discharge roller (135),
(136) is driven in normal rotation. As in the single-sided copy mode, the paper is transported between the paper re-feeding unit (100) and the sorter (400) from the circular guide surface (lt30b) of the switching claw (130) in the direction indicated by the arrow (,6,> direction). guided by.

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 (5L3) is turned on after a predetermined time after the trailing edge of the paper is detected by the sensor (SEI), and the υ output r1-ra (135) and (136) are switched from normal rotation to reverse rotation. This predetermined time is the time it takes for the trailing edge of the paper to move from the detection point of the sensor (SEX) to an arbitrary position between the leading edge of the film (129) and the nip of the discharge roller (135) <136>. It is. When the discharge rollers (135) and (136) are driven in the reverse direction, the paper is transported in the opposite direction to the arrow (A>) with the trailing edge of the paper at the beginning, and the film (129> and the switching claw (125) The intermediate conveyance roller (190>) is guided by the arcuate guide surface (125c).

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

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

In both the double-sided copy mode and composite double mode, when the number of copies per document set by the operator is stored in the storage section (200), each roller (13
5) The drive of (190) has completely stopped, and the switching claw <12
5) and (130) each return to the position indicated by the two-dot chain line.

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

(225), scraper (22B), belt winding bobbin (230), belt unwinding bobbin (235)
), belt (240), idle roller (245)
, (246), (247), etc.

Basically, the paper that has been conveyed downward from the intermediate conveyance rollers (190) and (191) is transferred to the guide roller (210).
, pinch rollers (215) and (216), and send it to the lower bobbin (230). At this time, the bobbin (230) is rotationally driven in the direction of the arrow (m).

The paper is wound onto the bobbin (230) together with the belt (240). When refeeding paper, the upper bobbin (235) is rotated in the direction of the arrow (rn) to rewind the belt (240) onto the bobbin <235>, and at the same time the paper is passed through the scraper (22).
8), the paper is fed upward while being peeled off, and is fed from the guide roller (21, , O) that reverses in the direction of the arrow (jo).
20).

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 the switching claw (2, 20) 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.
The switching claw (220) is an intermediate conveyance roller (190).

At (191), the leading edge of the paper that has been conveyed is below the guide surface.
220a), it rotates to the solid line position, opens the conveyance path, and moves the leading edge of the paper to the guide roller (210).
and guide it to the nip portion of 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 accommodate paper and take out paper during paper refeeding, and its drive mechanism will also be described with reference to FIGS. 4 and 5. . Note that this drive mechanism also operates the paper refeeding section (
320) registration roller (330).

(331) is also driven.

A timing pulley (195b) integrated with the timing pulley (195a) fixed to the spindle (192) of the intermediate conveyance roller (190), and a timing boot attached to the back frame (111) via the spindle (263). 1ba 261
A timing belt (260) is stretched between the clutch (CI-1>
64). The clutch (CLI) is attached to the end of the support shaft (332) of the registration roller (330). The clutch gear (264) is always rotatable, and is further engaged with a gear (266b) attached to the back frame (111) via a support shaft (265). A timing pulley (266a) that can rotate integrally with this gear (266b) and a timing belt ( 268) is installed. The support shaft (270) is further equipped with a gear (271b).
, the bracket (273) is rotatably attached, and the gear (
271b) is rotatable integrally with the pulley (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 (2) of the bracket (273).
Either 74) or 276 can be engaged interchangeably. That is, the bracket (273) is biased in the direction of the arrow (i>) by the coil spring (277), and is also biased by the solenoid (SL5) fixed to the back frame (111).
) is connected to the plunger. Solenoid (SL5
) is 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 the clutches (CLI) and (Cl3) are both off, they transmit the rotation of the gears (264) and (280) to the registration roller shaft (332) and the guide roller shaft (211>), and when they are turned on, they transmit the rotation of the gears (264) and (280) to the registration roller shaft (332) and the guide roller shaft (211>). It is configured to cut off transmission of the rotation.

In the above configuration, the timing belt (151)
The driving force rotates the timing belt (260) in the direction of arrow (e) via the pulleys (195a) and (i95b), and also rotates the timing belt (260) through the pulleys (261a) and gear (261b).
), clutch gear (264), gear (266b), timing belt (268) via pulley (266a)
The belt (268) is rotated in the direction of arrow (e). Furthermore, this rotation is caused by the solenoid (SL5)
is turned off, the pulley (z7ta) 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>
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 the arrow (j>).

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

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

(205) is the front frame (101) and the back frame (11)
The guide cover (201) can be engaged with the guide grooves (112) (113) (113) and the right side portion of 1).
The bottle (203) engages with the lower end of the guide groove (112), and a magnetic plate fixed to the upper end of the magnet (114> provided on the frame (101), (111) guide force/<-(201) (206) is attracted to the set state shown by the solid line in Figure 2.To open this guide cover (201) outward, use the handle (207 ) and using the bottle (203) as a fulcrum, slightly rotate the guide cover (20L) itself in the direction of arrow (k) to erect the magnetic plate) - (20
6) and the magnet (114) are released. 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) i±
It rotates in the direction of the arrow (k>) due to the moment due to its own weight.

The guide cover (201) finally covers the bin <203).
is engaged with the upper end of the guide groove (112), and the bit'/
(205) is -y rheme (x, ot), (111
) (7) By engaging with the right side part, the sheet is set in a substantially horizontal state as shown in FIG.
) is released.

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 eject the paper once wound onto the bobbin (230) directly to the outside of the paper refeeding unit (100) without passing through the copying machine <1>. Functions as a forced ejection tray. Forced ejection is executed by turning on a switch 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 opening and closing of the guide cover (201).

Next, the belt (240) for storing paper and the bobbins (230>, (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
Both ends of 40) are stuck to the bobbin (230), (235), and the idle roller (245), <246), (
The rack is passed to bobbin (230), (247),
235) and then rewound. In the initial state, the belt (240) is rewound toward the bobbin (235) (indicated by a solid line in FIG. 2). As 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). Eventually it becomes a bobbin (230).

<235), the belt (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), thereby causing the bobbin (230) to rotate in the direction of the arrow (m').

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

The motor (M3) is fixed to the back frame (111) via a bracket (281), and is rotatably mounted on a timing pulley (282) fixed to its output shaft and a support shaft (283) fixed to the back frame (111). A timing belt (28) is inserted between the installed timing pulley (284a)
6) is stretched. The support shaft (283) further includes a gear (284b), a bracket <287), and a gear (288).
a), (288b) is fully equipped, pulley (2a4g)
and the gear (284b) are rotatable together, and the gear (284b)
288a), (288b) The bar can be rotated integrally. In addition, the support shaft (29) fixed to the back frame (111)
Gears (291a) and (291b) are rotatably attached to the gears (291a) and (291b). The gear (284b) that rotates together with the gear (284a) meshes with the gear (291a), and the gear (291b) that rotates together with this gear (291a) meshes with the gear (291a).
> meshes with the gear (288a). Furthermore, a gear (238b-) that rotates together with this gear (288a) is a gear (238b-) that is rotatably attached to a bracket (287).
293).

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

(252) and (254) each have a gear (251)
, (253), physically rotatable gear (255a
), (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).
g), and the gear (255b) meshes with the bobbin support shaft (231
) is meshed with a gear (232) fixed to the end of the shaft.

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

In the above configuration, by rotating the bobbin (230) in the direction of the arrow (m), the belt <240) is attached to the bobbin <230).
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 I bar 284a) and gear (284b) via the timing belt (286), and the gears (291a) and (29
1b>, (288a), (288b) to gear (2
93) and rotates the gear (293) 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 (rn). At this time, gear (2
51) is free, and the bobbin (235) is attached to the belt (2
40) according to the arrow (m'). Meanwhile, rotate the bobbin (235) in the direction of the arrow (m) to
240) onto the bobbin (235), turn off the solenoid (SL4) and move the gear (293) to the gear (25).
1) and drive the motor (M3) in the reverse direction in the direction of the arrow (O゛). At this time, the rotational driving force of the motor (M3) is transmitted to the gear (293) according to the above-mentioned path, causing the gear (293) to rotate in the direction of the arrow (p').
293) is rotated by the bobbin gear (293) via the gear (251).
237) is transmitted to the bobbin support shaft (236) and rotationally drives the bobbin (235) in the direction of the arrow (+n). At this time, the gear (253) is free and the bobbin (230)
rotates in accordance with the arrow (mo) 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) fixed to the front frame (101) side end of the bobbin support shafts (231) and (236),
A belt (257) with a circular cross section is stretched over (23g) to apply a resistance force to the driven rotation of the other bobbin (235) and (230), thereby effectively preventing the belt (240) from loosening. . That is, one bobbin (230
) is rotated in the direction of the arrow (m), the other bobbin (235) rotates in the direction of the arrow (mo) due to the tensile force of the belt (240).
) direction, but a rotational force in the direction of the arrow (m>) acts from the boolean 1 bar 233) to the pulley (238) via the belt (257), causing the belt <257) and the pulley (233) to rotate.
) or (238), and as a result, appropriate tension is applied to the belt (240), causing the belt (240) to slip.
The bobbin (240) does not loosen or sag.
) is rotated in the direction of arrow (m).
Space when winding up the belt (240) can be effectively utilized.

The paper conveyed from the intermediate conveyance section (180) is
As will be detailed later, the belt (240) is attached to the bobbin (230).
It is wound up together with the paper and temporarily stored here. At this time, the outer diameter of the belt (240) increases as more paper is accommodated. Therefore, when the motor (M3) is driven at a constant rotation speed, the moving speed (paper storage speed) of the belt (240) also increases, and the difference with the paper transport speed at the intermediate transport section (180) gradually increases. Therefore, in this embodiment, the belt <240
) Idle roller (246) that rotates as a result of movement of
The outer circumferential surface of the idle roller (246) is coated with a high-friction member such as a rubber material to ensure the ability of the idle roller (246) to follow the belt, and the driven rotational speed of the idle roller (246) is detected and transferred to the motor (H3). feedback to the drive of
The moving speed (paper storage speed) of the belt (240) is controlled to be constant at all times.

Specifically, as shown in FIGS. 6 and 8, a gear (300>
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 (304a) and a pulse disk (304).
b) are provided integrally and rotatably. Gear (30
0) meshes with gear (302g>), 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 state of winding and unwinding of the belt (240), a transmission type photo sensor (
SE4) is installed, and an overrun mark (241>) is placed on the belt (240) as shown in FIG.

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

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

In other words, as detailed in the control procedure later, the paper refeed unit (
When the power is turned on to the Zoo), 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), 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 (100) is turned off, the next time the power is turned on, the bobbin (235) will be moved in the direction of the arrow (m). Even if the sensor (SE4) is driven, a problem arises in that the standby mark (242) cannot be detected by the sensor (SE4). Therefore, in order to eliminate such a problem, in this embodiment, the standby mark (24
On the upstream side in the belt return direction of 2), there are overrun marks (241), (24
1) was established. Therefore, the detection of the standby mark (242) by the sensor (SE4) not only stops the operation of rewinding the belt (240) to the bobbin (235), but also
Even if the belt (240) starts returning to its initial state from the time when the standby mark (242) has already passed the detection point of the sensor (SE4), the overrun mark (241>, ( 241), the return operation of the belt (240) is reliably stopped.

By the way, the width of the standby mark (242), overrun mark (241), and (241) is (L).
The pitch (L2) between the standby mark (242) and the overrun mark (241) is the pitch (L2) between the overrun mark (241) and (241).
l〉 is set larger than 〉. 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 belt (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 length of the end mark (243) L3) is the length of the belt (
In other words, the end mark (243) is longer than the length in the storage direction of the maximum size paper stored in the sensor (S
The length of time during which the sensor (SE4) continues to detect the end mark (243) from the time when it is detected by the sensor (SE4) until all the sheets that have already been fed in the copying machine main body (1) are stored in the belt (240). It is set to

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) has been fully installed. When the guide roller (210) is rotated in the direction of the arrow (j) during paper storage, the pulley (212), belt (258),
As the pulley (227) rotates, the switching pawl (225) is also urged in the direction of the arrow <r, and is held at the solid line position in FIG. 2 by being regulated by a stopper (not shown). Switching claw (225)
At this solid line position, the paper conveyed from the guide roller <210) is placed on the belt (225a) by its guide surface (225a).
40) and the scraper (228). On the other hand, when refeeding the paper, the guide roller (210) moves in the direction of the arrow (j'
) direction, the switching claw (
225) is urged in the opposite direction to the arrow (r) through a similar path, is regulated by another stopper (not shown), and is held at the position indicated by the chain double-dashed line, and the paper fed out from the belt (240) is guided to the guide surface (225). At 225a), it is guided to the nip portion between the guide roller (210) and the pinch roller (216).

As described above, when the guide roller (210) is driven to rotate forward and backward in the direction of the arrow (j) or (j゛), the belt (
25B> 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 flexible resin film (229) is adhered to its surface, and is rotatably held by the switching claw (225) at its upper end. The tip of the film <229) contacts the outer peripheral surface of the bobbin (230) and the belt (240) wound thereon due to the moment due to its own weight, and the belt (240) moves from the solid line position to the two-dot chain line position in FIG. It is displaced according to the winding thickness and guides the paper being stored and the paper being fed out.

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

In FIG. 2, the conveyance roller (
The paper conveyed in steps 190) and (191) first comes into contact with the guide surface (220g) of the switching claw (220), rotates the switching claw (220) to the solid line position, and then moves to the guide surface (220a). and the rib-shaped guide portion (201b) of the guide cover (201), and the guide roller (210
) and the pinch roller (215). The guide roller (210) is driven forward in the direction of the 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 arrow (j), and from between the guide plate (219) and the guide surface (225a) of the switching claw (225) set at the solid line position, It is conveyed downward between the straight portion of the belt (240) connecting the idle roller (246) and the bobbin (230) and the stock bar (228). Solenoid (SL4) is turned on and gear (293) shifts to gear (2).
53), and the leading edge of the paper is connected to the sensor (
At a predetermined timing after detection by SE2'), the motor (M3) is driven forward in the direction of arrow (0), and the bobbin (2
30) is rotationally driven in the direction of arrow (m). With this,
The paper is wound onto the bobbin (230) together with the belt (240).

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

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

(Paper refeeding unit) The paper refeeding unit (320) includes a guide plate (321), a guide frame (325), and a guide plate (32) attached thereto.
9), registration rollers (330), (331), and the switching claw (220). As mentioned 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'')
25) and is rotatably attached to the registration roller (330).
) and rotates as a result. Guide frame (325)
There is a support shaft (326) between the frames (101) and (111).
), and the paper refeed path can be opened by rotating upward after releasing the guide frame (182) and guide cover (201).

In addition, the guide plate (321) is a photo sensor (SE
3) is attached via a bracket (322).

This sensor (SE3) has an actuator (32B) that connects the guide surface (zzob) of the switching claw (220) and 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 the paper that has been copied on one side has been wound onto the bobbin <230), when the operator instructs to start refeed copying [turn on the print switch (61), see Figure 10], the solenoid (SL4) ) is turned off and the gear (293
) is engaged with the gear (251), the motor (M3)
is driven in reverse in the direction of the arrow (O゛), and the bobbin (235)
is rotationally driven in the direction of the arrow (to). 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 adjusted by the stiffness of the paper itself and the tip of the film (229) attached to the scraper (228). The paper is peeled off from the surface of the belt (240), and the paper is fed out from the bobbin (230) with the rear end in the storage direction leading. The paper is transferred to the idle roller (2) of the belt (240).
45) and the scraper (228), and the idle roller (245) lifts the belt (
240) due to a sudden change in the direction of movement of the belt (240).
The paper is separated from the guide plate (240").
9) and the guide surface (225a) of the switching claw (225), and the guide roller (210) and the pinch roller (
216). At this time, the guide roller (210) is driven in the reverse direction in the direction of the arrow (j').

Therefore, the paper moves around the guide roller (210) with an arrow (
j゛) direction, passes between the guide surface (220b) of the switching claw (220'') and the guide plate (321), and reaches the registration rollers (330) and (331).Registration roller (330) , (331) is rotated by the clutch (CLI) just before the leading edge of the paper in the re-feeding direction arrives.
The guide roller (210) and bobbin (235>) continue to rotate.Therefore, the leading edge of the paper is stopped by the registration rollers (330) and (331).
collides with the nip 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 (H3) is turned off to stop the rotation of the bobbin (235).The control here is performed based on a combination of the paper leading edge detection signal from the sensor (SE3) and a timer.

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

<331), the guide roller (210) is rotationally driven, and the paper is moved between the guide frame (325) and the guide plate (32).
9) while being guided by the paper refeed path (
40). The purpose of causing the leading edge of the sheet to collide with the nip portion of the registration rollers (330) and (331) in a stopped state to form a loop at the leading edge of the sheet is to correct the 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 based on the paper refeeding signal from the copying machine main body (1).

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

(Measures against curling of paper) By the way, in this embodiment, 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 <ffl> on the bobbin (230) in the storage section (200) is set to the same direction as the rotation direction (a) of the photosensitive drum (10) in the copying machine main body (1). Set. This is because the direction of the curl formed on the paper when it is stored in the bobbin (230) is corrected when the paper is re-fed and the photoreceptor drum (10)
This is to make it easier to separate the sheet from the photoreceptor drum (10) by setting the sheet so that it is in the opposite direction to the curvature of the photoreceptor drum (10) when it comes into close contact with the photoreceptor drum (10) again.

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 onto a belt (240) with the first side facing outward. At this time, the curl is formed so 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 double-sided copy mode or composite copy mode, the image forming surface when refeeding paper is in the storage section (2).
00), 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 suspending the copy operation or canceling the set number, a numeric keypad (64) for setting the number of multi-copy copies (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.
), magnification selection key group (71) for selecting copy magnification
, a group of magnification display LEDs for displaying the selected magnification (
72), a copy mode selection key (73) for selecting one-sided, two-sided, and composite copy modes, one-sided copy mode display ED (74), two-sided copy mode display LED (74),
75) and a composite copy mode display LED (76).

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

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

<72), (74), <75>, <76) are connected via a decoder (82). The switch matrix has keys (61) to (64) on the operation panel (60).
), (66), (67), (69), (71).

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

The CPU (90) has a paper detection sensor (
SE1), (SE2), (SE3), belt (240
) mark detection sensor (SE4), guide cover (2
The opening/closing detection sensor (SE5) of 01) and forced ejection switch (SW) are connected, and the output terminal is connected to a solenoid (SLI) ~(SL5),') that drives the paper conveyance system.
Latches f(CLI), (Q, 2) are connected.

The motor (M) that drives the bobbins (230) and (235)
S) is a 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 roller (246).
The signal from the sensor (SE7) detected via the sensor (SE7) and the speed signal from either the output terminal (Pi>, (P2) are input. The terminal (Pl) is the speed signal for driving the bobbin (235). The terminal (P2) is connected to the bobbin (
230) is output. Each of these signals is converted into a voltage value within the circuit (Ql) and output to the circuit (Q2). On the other hand, the circuit (Q3) outputs a reference waveform voltage for the pulse disk (304b) to maintain a constant rotation speed 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 belt (Q2) driven by the motor (MS) The moving speed of 240) can be set slightly higher than the paper transport speed when storing paper, and can be 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). The CPU (90) transmits, to the CPU (80), a signal that the number of copies of paper has been accommodated, a wait signal that waits for the copying operation, and the like. Although it is omitted in FIG. 11, the CPU (80) is also connected to another CPU that controls the original scanning optical system (20), and when the sorter (400) is installed, the CPU for controlling the document scanning optical system (20) is also connected. Also connected.

[Control Procedure] Next, the control procedure for 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 and subsequent figures. By the way, in the following explanation, on-edge refers to switches, sensors,
Off-edge means that a signal, etc. is switched from an off state to an on state, and off-edge means that a switch, sensor, signal, etc. is switched from an on state to an off state.

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

Jam flag: Displays that a jam has occurred within the copying machine main body (1) and within the paper refeed unit (100). C
In the control by the PU (80), step (512)
It is set when the occurrence of a jam is detected in the jam detection/processing subroutine executed in , and is reset when the jammed paper removal process is confirmed. In the control of the CPU (90), it is set when the occurrence of a jam is detected [see step (5384)], and reset when the jam processing is completed [see step (5392)].

Jam flag: When the power is turned on to the paper refeeding unit (100), it is displayed that there is paper left in the storage section <200) that the previous operator forgot to remove [step (
5234), step (5392).

(5412) to reset.

Jam flag: Displays that a jam has occurred while conveying paper within the paper refeeding unit (100) [step (
5374), (5376), (5378), (53
81) and reset in step (5392)].

Copy flag: Displays that the copying machine main unit (1) is in the process of copying [Set in step (598), step (Sill), (5116), <5120>
So reset.

Single-sided mode flag 2 Instructs execution in single-sided copy mode [set in steps (523) and (530), reset in step (527)].

Duplex mode flag 2 Instructs execution of first side copy in duplex copy mode [Set in step (527'),
Reset in steps (523) and (529)].

Composite mode flag 2 Instructs execution of first side copy in composite copy mode [Set in step (529), set 1 in steps (523) and (530).

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

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

Paper refeeding flag: Indicates that the copy process is for paper that has been re-fed from the paper refeeding unit (100) [
Set in step (5116), step (5120)
, <5366), reset code at (5407).

Empty signal: Paper cassette (30>, (32>)
[Step (55)
5) to set, and step (551) to reset.

Stop flag: Instructs to temporarily stop the subsequent copying operation during the copying operation [step (553),
<566), set at (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
Displays the completion of the comparison with the number of sheets that can be accommodated (N>) [Step (580) Set in ', Step (574),
<S, 83) to reset.

Copy operation permission flag: Indicates that copy operation is possible without causing any problems. In particular, the number of sheets that can be accommodated (
N) Reset in the case of a postfix number to prohibit the copy operation [Set in step (579), step (580)
) to reset].

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

Paper feed wait signal: Displays that the paper refeed unit 7 (100) is not ready to accommodate paper, and prohibits paper feeding operation [Setting is stopped at step (5227), step (5249), ( 5255) to reset.

Paper presence signal: When the set number of sheets (number of copies) is stored in the storage section (200), the sheet is allowed [step (5310)], and all the sheets are ejected from the storage section (200). It is reset when [ste knob (530
8), (5363), (5412).

Preprocessing flag 2 The paper refeed unit (
100) to return to its initial position [set in step (5223), reset in steps (5249) and (5255)].

Standby flag: Indicates that the belt (240) has returned to its initial position [Step (5249)].

Set at (5255), reset at step (5310)
7].

Drive request signal: Main motor (
Ml) is requested to be driven [Stemp (5227),
(5293).

<5323), set at (5407), step (5
249), (5255).

Reset with (5310), <5329), (5409).

Winding flag: Displays that the standby mark (242) and overrun mark (241) are detected by the sensor (SE4) when returning the belt (240) to the initial position [steps (5246), (5252) )
, set at (5254), step (5249),
(S255)].

Position A flag: Indicates that the region (L2) of the belt (240) is located at the detection point of the sensor (SE4) [Set in step (5246), step (5249)
) and 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 at 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 code at (5363).

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

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

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

When the CPU (80) is powered on, the step (Sl
) to reset the random access memo J (RA
M), initialize registers, timers, counters, etc., and perform initial settings to put each device into the initial mode. Next, in step (S2), initial communication is performed with 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 "rO" or not. If it is set to "1", the process immediately moves to step (512), and if it is reset to r□, each subroutine of steps (S6) to (513) is sequentially called.

In the step (S6), the input of the number of copies (number of copies per original) set with the numeric keypad 4) is accepted.In the re-step (S7), the input of the copy mode (single-sided copy number) set with the switch (73) is accepted. , double-sided, composite) input is accepted. In step (S8), the input of the paper size set by switch (69) is accepted. Step (S9)
Then, the clear/stop input from the switch (63) is accepted. In step (510), when duplex or composite copy mode is selected, the set number of sheets (number of copies) is transferred to the paper refeed unit (100). ), and determines whether or not to permit the copy operation.Sten 2 (Sll) processes the copy operation under the selected copy condition.In step (512) A jam within the copying machine body <1) is detected and processed. Specifically, the jam timer set in step (511) is determined,
If the occurrence of a jam is detected, the jam flag is set to "1", after which it is determined whether the jammed paper has been removed, and the apparatus is reset to a copyable state. In step (513), the CPU
(90) etc.

After calling each of the above subroutines, step (514
), wait for the internal timer to finish counting, and then 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 (100) has been reset to "0", it is determined in step (522) whether the paper refeeding unit (100) is attached or not based on the on/off signal from the microswitch (MS). If not installed, step (
523) turns on the LED (74) and sets the single-sided mode flag to "1", and the LED (75), (76
) is turned off, and the duplex mode flag and composite mode flag are reset to "rO", and this subroutine ends. On the other hand, if it is installed, in step (524) it is determined whether the selection switch (73) is on-edge or not, and in step <SZ
S>, it is determined whether the paper refeed flag is "0" or not. If YES in both cases, that is, the copying machine main body (1) is not in the copying operation [YES in step (521), and the selection switch (73) is turned on, step (52
6) Execute the following 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 (526), the single-sided mode flag is r.
Determine whether or not IJ, and if rl is set, turn off the LED (c) in step (527), and turn off the LED (c).
(75) and set the single-sided mode flag to "0".
and set the duplex mode flag to "1".

When the single-sided mode flag is reset to r□, the double-sided mode flag is set to rl in step (528).

If it is set to "Engine", I and ED (75) are turned off in step (529), and L E D
(76) and set the duplex mode flag to "O".
Reset lt, and set the compositing mode flag to rlj.

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

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 or not the paper refeed flag is "o", and if it is reset to "0", step (541) is performed.
After confirming that the copy flag has been reset to r□ in S42), it is determined in step (543) whether the selection switch (69) is on-edge. If it is on-edge, set the top picture paper or the bottom picture paper alternately. That is, if it is determined in step (544) that the overprint paper flag is "1.", then in step (545) the overprint paper flag is reset to "0" and the underprint paper flag is set to "1." ,
If it is determined in step (544) that the top picture paper flag is rO, then in step (546) the bottom picture paper flag is set to r□,
and set the overprint paper flag to rl. 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> is processed.

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 l"IJ or not. If it is set to "rl" (if the copy operation is in progress), the stop flag is set to "rl" in step (553), and the subsequent copy operation is Instruct to stop once and step (554)
) to store the set number (set number of copies) in RAM. Furthermore, in step (S55), the empty signal is set to "1."

If it is determined in the step (549) that the empty signal is on-edge, that is, if paper is replenished, the original value stored in the step (554) is again substituted for the preset number. Further, in step (557), the number of copies missing at this time is calculated, and in step (55B>), the stop flag is reset to r□, allowing the copying operation to be restarted.

Figure 15 shows the clear/stop switch (6) executed in step (S9) of the main routine of the CPU (80).
3) shows a subroutine for determining the state.

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, i〉The first time it is turned on, the subsequent copy operation is interrupted.

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

i) 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, i) If you turn it on once when there is no paper in the paper feed section, the second side will be set to double mode. .

i) 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 "1". If set to '1', step (563)
If it is determined that the copy flag is r OJ, that is,
If the copy operation is not in progress, the stop flag is reset to 10'' in step (564), and the copy conditions are initialized in step (568).

When the stop flag is "r'0" [step (S62)
In step <565), the copy flag is r□.

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 rl in step (566), and the set number (copy number) is stored in RAM.

FIG. 16 shows a subroutine for copy operation permission determination executed in step (510) of the main routine of 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 is selected or has already shifted to refeeding copy operation, the determined flag is reset to "0" in step (574), and step (579) is executed.
) sets the copy operation permission flag to "1".

On the other hand, if YES in both steps (572) and (573), that is, the duplex or composite copy mode is 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 1″θ, step (57
In step 6), the length (L5) in the transport direction of the selected sheet is calculated, and in step (577), the number of sheets (N) that can be stored in the storage section (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 stored paper L6: Paper on belt (240) The information on (L4) and (L6) is the spacing between sheets when they are stored in step (S2).
The data is sent from the CPU (90) to the CPU (80).

Next, in step (578), the number of sheets that can be accommodated (N) calculated using the formula 0 and the number of copies (number of copies) are compared, and N
If ≧the specified number, the copy operation permission flag is set to "rl" in step (579). If N<the 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”.

Furthermore, even if the above judgment is completed, if the number of entries or the paper size is changed, the above judgment is repeated again, that is, if it is judged that the judgment completed flag is "1" in step (S7'5>) , in step (581) it is determined whether the number has been changed, and in step (582) it is determined whether the paper size has been changed, and if either is YES, then step (581) is determined.
83), the determined flag is reset to r□.

FIGS. 17a and 17b show a copy operation subroutine executed in step (511) of the CPU (80) (7) main routine.

First, in step (591) it is determined whether the copy flag is r□, and if it is reset to "0", that is, if the copying operation is not in progress, then in step (592) the print switch (61) is turned on. is detected, it is confirmed in step (593) that the copy operation permission flag is set to "1" and that the empty signal is reset to "O" in step (594), and then step At (595), it is determined whether the stop flag is "1" or not. If the stop flag is set to "1", the stop flag is reset to r□ in step (596), the original value stored in the digit is assigned in step (597), and step <598 ), the copy flag is set to "1." If it is determined that the stop flag is r□ in step (595), the copy flag is immediately set to "1."
9B).

Next, in step (599), it is determined whether the copy flag is "1", and if it is reset to "0", the process immediately moves to step (S108). If it is set to "1", it is determined in step (5100) whether or not the paper feed prohibition signal is "1". If it is set to rIJ, it means that a trouble has occurred in the paper refeeding unit (100), and in step (5101) the stop flag is set to "rl", and in step (5105) the paper currently being fed is After the paper feeding is completed, the paper feeding operation is stopped. Also, step <5100
), if it is determined that the paper feed prohibition signal is "O", it is determined whether the stop flag is "1" in step (5102>), and if it is set to '1', step (S105) 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 wait signal is "O", it is determined in step (5103) whether or not the paper feed wait signal is "O", and if it is reset to "0", the predetermined cassette (30) or ( The paper feeding operation from 32) is executed, and the process moves to step (510B). Paper feed wait signal is "1"
If it is set, the process immediately moves to step (5108).

Next, in step (5108), a copying operation and a paper transporting operation are performed to form an image on the fed paper. After that, in step (5109), the single-sided mode flag is set to rl.
, and if it is set to "1", that is, if copy processing is in progress in one-sided copy mode, it is determined in step (5110) whether or not copying for the specified number has been completed. When the process is completed, the copy flag is reset to r□ 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, then in step (5112) it is determined whether the paper refeed flag is r□. Determine. If it is reset to r□, that is, when copying to the first side,
In step (5113), it is confirmed that the set number of copies have been completed, and in step (5114) it is determined whether the paper presence signal is on-edge. If it is on-edge, that is, the storage part (
200), the step (
5115) to store the selected paper source and its paper size in RAM.
to be memorized. Furthermore, in step (5116), the overprint paper flag and the underprint paper flag are reset to "0", the paper refeed flag is set to "1", and the copy flag and paper feed prohibition signal are respectively reset to rOJ. 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 set to “0” in step (5117).
Determine whether it has been reset to .

If it is reset to "0", that is, the housing section (200
), if the final paper is re-fed from step (5).
After confirming that copying to the final sheet has been completed in step 118), the flag of the paper feed section already stored is set to "1" in step 5119. Furthermore, step (5120)
Reset the paper refeed flag and copy flag to r□,
End this subroutine.

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

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

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

Step (520B) 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, a jam in the paper refeeding unit (100) is detected and handled.

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 there is an interrupt request from the CPU (80) during processing by the CPU (90), the CPU
Processes communication with U (80).

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

Here, first, in step (5221), it is determined whether the copy flag is rl, and if it is reset to "0", the process moves to step (5225), and if it is set to "rl", the process goes to step (5222). It is determined whether the paper presence signal is off-edge or not. If it is off-edge, the storage part (20
It is assumed that the paper refeeding operation from step 0) has been completed, and step (
In step 5223), the preprocessing flag is set to 11'', and the process moves to step 5225. If the paper presence signal is not off-edge, the preprocessing flag is set to "1" in step (5224).
”, and if it has been set to “1”, the process moves to step (5205), and if it has been reset to “rO”, the process moves to step (5231).

In step (5225), it is determined whether the standby flag is "0". rl, the belt (240) has already been rewound to its initial position, so the process immediately moves to step (5231). If the standby flag is reset to r OJ, step (52
After confirming that the drive request signal is reset to "0" in step (5227), the drive request signal and paper feed wait signal are set to "1", and the motor (M3
) in the belt rewinding direction. At the same time, the state counter used in the following step <5230) is set to "0".
” and start timer A1 trouble timer. Here, the bobbin (235) is rotationally driven in the direction of the arrow (m), and the belt (240) is rotated on the bobbin (235).
). For timer A, step (
5230) subroutine (see FIG. 20). The trouble timer is for detecting a trouble in which the belt (240) does not move within a predetermined time when the motor (M3) is driven.

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

Next, in step (5231), it is determined whether the paper refeed flag is "11" 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 "0", it is determined in step (5233) whether the sensor (SE3) is turned on. If the sensor (SE3) is turned on, that is, before or during copy processing to the second side, tf! ! It is determined that the paper presence signal has been reset because X has been turned off, and the jam A flag is set to "1" in step <5234).

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).

This subroutine takes step (5227) during preprocessing.
, (5229) executes control to turn off the motor driven by M. And timer A used here
, B are set under the following conditions.

Timer A > L2/V...
・・■Timer A>Timer B>Ll/V ・Old・
・■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 (
5E4) detects marks (241) and (242) and goes on-edge, the state counter is incremented in step (S242) and the state counter is incremented in step (5243).
), the value of the state counter is checked, and the following control is executed based on the value.

When 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 SE4) is detected, it is determined in step (5244) whether or not the winding flag is "0". rO”, step (524
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 (SE) 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 area (L4)]. In other words, the sensor (SE
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 (H3) and set the winding flag to position A.
Set the flag to ``1'' and reset the state counter to 40''.

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

Next, if it is determined in step <5244 that the winding flag is "rl", in step (5248) it is confirmed that the position A flag is set to "1", and in step (5249) the motor ( M3) is turned off.This stops the rewinding movement iV of the belt (240).At the same time, the winding flag and position mA flag are reset to r□,
Set the standby flag to "rl" and reset the state counter to 10". Also, set the solenoid (
SL4) and (SL5) are turned off, and the drive request signal, paper feed wait signal, and preprocessing flag are reset to r□.

After starting timer B in step (5247), if the value of the state counter becomes "2", that is,
When the second on-edge of the sensor (SE4) is detected, it is confirmed that the winding flag is reset to "0" in step (5250), and then step (5251) is performed.
), it is determined whether timer B has finished counting.

If the count is finished, press sensor (SF4) 3.
If the count is not completed after waiting for the second on-edge, it can be determined that the position where the belt (240) was facing the detection point of the sensor (SF4) was in the area (L2>).
Step (S252) is turned off.

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

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

After determining that timer B has finished counting in step (5251), if the value of the state counter reaches "3", that is, if the third on-edge of the sensor (SF4) is detected, step (5251) is executed. 5253), it is determined whether the winding flag is "O". If it is reset to "0", the motor (M3) is turned off in step (5254), the winding flag and the position B flag are set to "1", and the state counter is reset to 40". On the other hand, if the winding flag is set to "1", step (525
5) to turn off the motor (M3) and turn off the solenoid (SL4).
, (SLY) is turned off, the winding flag and position B flag are reset to r□, and the standby flag is set to "1". Further, the state counter is reset to "O", 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, step (5281) determines whether the single-sided mode flag is "1", step (5282) determines whether the paper refeed flag is "1", and step (5284) determines whether the duplex mode flag is "1". The following processing is performed according to the copy mode being processed at that time.

When copying one side [YES in step (5281), when copying the second side in duplex or composite copy mode [step (5281)]
If YES in step 5282), the paper is discharged straight to the paper discharge tray (175) or sorter (400) in step (5283). When copying the first side in double-sided copy mode [YES in step (5284), 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 (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 the copy flag is "1" or not. If it has been reset to "0", the process moves to step (5296), and if it has been completely set to "1", it moves to step (5292). When the on-edge of the main body ejection signal is confirmed, that is, when the leading edge of the copied paper reaches the ejection section of the copying machine main body (1), the drive request signal is set to "1" in step (5293). . Next, step (5)
294), when the on-edge of the sensor (SF3) is confirmed, that is, the paper sent to the paper refeeding unit (100) is transferred directly from the switching claw (125) to the intermediate conveyance section (180).
(during double-sided copy mode), or is switched back and reversed by the ejection rollers (135) and (136), and then transported to the intermediate transport section (180) (during composite copy mode). When the tip reaches the detection point of the sensor (SF3), the solenoid (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 fully rotated in the direction of 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, a trouble timer is started in step (5297) 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.

After that, when the off-edge of the sensor (SF3") is confirmed in step (529B), that is, when the trailing edge of the paper is detected by the sensor (SE2), the off-timing of the motor (M3) is determined in step <5299). A timer D 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).
), the guide red arrow (m) on the scraper (22B)
The belt (240) is wound onto the bobbin (230) rotating in the direction, and the step (5300)
When it is confirmed that the timer D has finished counting, the motor (M3) is turned off in step <5301>, and the timer D is turned off.
Reset. Further, in step (5302), it is determined whether the sensor (SE4) is on-edge or not.
) and detects the end mark (243) of the belt (240
) has been wound up to the terminal end, and step (53
In step 03), the paper feed prohibition signal is set to rl, 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, the solenoid (SL4
), (SL5) is turned on, the paper presence signal is reset to "0", and the process moves to step (5309). If the stop flag is not off-edge, the process moves to step (5309). If the empty signal is not an off-edge, it is determined whether the copy flag is "1" in step (5306), and if it is set to "1", after the clear/stop switch (63) is turned on once. , determines that the copy operation has been restarted, executes step (5308), and moves to step (5309). If the copy flag is reset to "O", 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 the count value is “1'' or more, step (5
310), step (5312) via (5311)
The accommodation counter is reset to OIT. If the count value is "0", this subroutine is immediately terminated.

Executing copy operation to the first side, step (5309)
When it is determined that the count value of the storage counter is equal to the set number, the predetermined number of sheets of paper has been stored in the bobbin (230), so the solenoid (SL4) is activated in step (5310).
), (SL5), reset the drive request signal to 10, set the paper presence signal to 1, and reset the standby flag to 0.
After confirming that the stop flag has been reset to "0" in step 311), the accommodation counter is reset to "θpa" in step 5312, and this subroutine is ended.

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

First, in step (5321), it is determined whether the paper refeed flag is "1.", and if it is reset to 'O', this subroutine is immediately terminated. rl", it is determined in step (5322) whether the copy flag is on-edge, and if it is on-edge, it is determined in step (5323).
), the paper refeeding flag and drive request flag are set to "1", the state counter is reset to rO, and the process moves to step (5325). After that, step (5324)
After determining that the paper re-feeding flag is 11'', the process moves to step (5325). In step <5325>, the current state of the state counter is checked, and the motor (M3) and clutch (CLI) are controlled according to the count value.
, (Cl3), etc.

In the initial stage when the count value of the state counter is reset to "0", it is determined in step (5326) whether or not the transport permission signal is "1". If it is reset to "OJ", the process moves to step (5360), and if it is set to "1", it is determined in step (5327) whether or not the stop flag is "O". If it is reset to "rO", it will prepare for paper refeeding. That is, step (5
328), starts the timer F that determines the interval between sheets to be re-fed, and sets the state counter to "1". , the copy flag, paper refeeding flag, and drive request flag are set to "O" in step (S329).
and turn off the motor (M3).

When the count 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 count value of the timer F is started in step (5331). , and step (533
2) drives the motor (M3) in the rewinding direction, turns off the clutch (CLI), turns on the clutch (C10), and sets a jam timer to detect the occurrence of a jam in the paper refeeding section (320). Start and set the state counter to “2n.” This will cause the registration roller (330>, (
331) has completely stopped rotating, and the guide roller (21
0) is completely reversely driven in the direction of the arrow (jo), the paper begins to be completely unreeled 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 "1", and if it is set to "1", the timer F1 is set in step (5335). The YAM timer B continues counting, and in step (5336), the clutch (CLI) is kept in the off state and the motor (M3) continues to be driven in the rewinding direction, and the process moves to step (5339). The transport permission signal is “
If it is reset to "O", the count of the timer F and jam timer B is temporarily stopped in step (5337), and the clutch (CLI) is turned on in step (5338) to stop the reverse rotation of the guide roller (210). Then, the motor (M3) is turned off and the process moves to step (5339).

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

When the count value of the state counter is "3", it is determined in step (5341) whether the transport permission signal is "rl", and if it is set to "1", the timer F and timer G are set in step (5342). , the jam timer C continues counting, and the clutch (CLI) is activated at step (5343).
) continues to be 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 has been reset to "O", the counts of the timer F, timer G, and jam timer C are temporarily stopped in step (5344), and the count is stopped in step (534).
In step 5), turn on the clutch (CLl), turn off the motor (M3), and proceed to step (5346).Next, when it is confirmed in step (5346) that the timer G has finished counting, the process proceeds to step (S347). ), turn on the clutch (CLl), turn off the motor (M3), and set the state counter to "4".
The feeding operation from 30) 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.

When the count value of the state counter is "4", it is determined in step (5348) whether or not the transport permission signal is "1", and if it is set to "1", step (5349) is performed.
Then, the timer F1 jams the timer C(7) and moves to step (5351). If the timer F1 is reset to "0", the timer F1
Stop the count of jam timer C once and move to step (5351) 0 Next, step (5351)
), when it is confirmed that the timer F has finished counting, in step (5352) the motor (H3) is restarted to drive outside the rewinding direction, the clutches (CLI) and (C10) are turned off, and the state counter is set to a5. ”.

With this, the guide roller (210) is reversed in the direction of the arrow (jo), and the registration roller (330), (
331) is driven, and the paper is fed in and out from the paper refeeding section (320).

When the count value of the state counter is 45'', it is determined in step (5353) whether the transport permission signal is ``1'', and if it is set to ``1'', the count of the jam timer C is started in step (5354). Continue and step <
5355), the drive of the motor (M3) in the rewinding direction and the off state of the clutch (CLI>, (C10) are continued), and the process moves to step (5358).The conveyance permission signal is r□.

If the count of the jam timer C is temporarily stopped in step (5, 356), the motor (M3) is turned off in step (5357), and the clutches (C1l) and (Cl3) are turned on. Step (53
Next, when the off-edge of the sensor (SE3) is confirmed in step (5358), that is, when the trailing edge of the paper is detected by the sensor (SE3'), the process proceeds to step (5359). The jam timer C is reset and the state counter is reset to "0". With this, one sheet of paper is transferred from the storage section (200) to the copying machine main body (1).
), the paper has been re-feeded to the paper re-feed path (40).

Next, in step (5350), 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, step (536
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 "rO", the paper refeed flag is reset to "0" in step (5366). On the other hand, in step <5362>, timer G
When the end of counting is confirmed, step (5363)
to reset the paper presence signal to "0" and turn the motor (M3>,
The clutch (CLI>, (Cl3) is turned off, the paper refeeding flag is reset to 10'', and the timer G is reset, and this subroutine is ended.

Figures 24a and 24b show the jam detection and
The processing subroutine is shown.

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 device is turned off. Reset.

First, in step (5371), it is determined whether the jam flag is "0" or not. If it is fully 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), (5375), <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 (5374).

(5376) and (5378) set the jam B flag to “1”.
” and moves to step (5383). Further, in step (5379), a trouble timer [step (5227)] is set.

(5229)], and if it is confirmed that the count has ended, the sensor (SE7) monitors the driven rotation of the idle roller (246) in step (5380).
It is determined whether there is no pulse input 2 to. If there is no input, it is determined that the hole motor (M3) does not operate normally, and the jam B flag is set to rl in step (5381).

and moves to step (5383). on the other hand,
If there is an input, the trouble timer is reset in step (5382) and this subroutine is ended.

In step (5383), the jam signal is sent to the CPU (80
), the jam flag is set to "1" in step (5384). The jam signal is processed by the CPU (80) and displayed on the display section (65) of the operation panel (60). Next, in step (5385) it is determined whether the jam A flag is "1" or not, and if it is set to "1", in step (5386) the discharge flag is "confirmed that it has been reset to Ol". Ue, step (5387)
to stop the operation of all drive systems, and proceed to step (538B).
), a forced ejection subroutine for directly ejecting the paper from the storage unit (200) to the outside is processed. On the other hand, if it is determined in the step (5385) that the jam A flag has been reset to "0", in this case the jam B flag is rl
, 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 (
When the off-edge of the sensor (SE5) is confirmed in step (5390), it is determined that the jammed paper has been removed and the guide cover (201) is 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 step (5) in the preprocessing subroutine.
232) or the forced ejection subroutine executed at step (5388) in the jam detection/processing subroutine.

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

First, in step (5401), the jam A flag is "1".
In step (5402) it is determined whether the paper presence signal is "1" or not, and in step (5403) it is determined whether the copy flag is r OJ. Forced ejection of paper can only be executed when the jam A flag is set to "1" or when the paper present flag is set to "1" and the copy flag is reset to "10". If the state is executable, step (54)
After confirming that the discharge flag is reset to "O" in step 04), the sensor (SE5
) is turned off, and step (540
In step 6), 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. switch(
SW) is operated by the operator, and when its on-edge is confirmed, the drive request signal is sent in step (5407).
1" and reset the copy permission signal to "O". At the same time, the paper refeed flag is reset to "0", the discharge flag is set to "1", and the motor (M3) is driven in the rewinding direction.

As a result, the sheets stored in the bobbin (230) are sequentially fed out from the belt (240), and as shown in FIG.
10) The paper is 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, and if it is on-edge, that is,
When the standby mark (242) of the belt <240) is detected by the sensor (SE4), it is determined that the rewinding of the belt (240) has been completed, and the drive request signal is reset to r□ in step (5409). Along with the motor (M3)
Turn off. Furthermore, after confirming that the discharge flag is set to rl in step (5410), it is determined in step (5411) whether the sensor (SE5) is on-edge. When the guide cover (201> is closed and the sensor (SEA) is on-edge, step (54)
12), set the copy permission signal to ``11'', reset the ejection flag and jam flag to ``0'', set the overprint paper flag to ``rl'', and set the paper present signal and paper feed prohibition signal to ``0''. ” and exit this subroutine.

[Second Embodiment] In the above-described embodiment, the preprocessing subroutine (see FIG. 19) for returning the belt (240) of the paper storage section (200) to the initial position and the step (5230> in this subroutine) are performed. In the belt drive stop processing subroutine (see Fig. 20) executed at
Timer A and timer B were used to detect the amount of movement. If the moving speed of the belt (240) is not constant, timer A and timer It may be used instead of 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, and the flowcharts shown in FIGS.
Control is performed based on the flowchart shown in FIG.

Here, the pulse count of the sensor (SE7) is started at step (5227°) and step (5247°), and whether the pulse count is larger than the reference value (Na) at step (5245') is determined at step (5251°).
), it is determined whether the pulse count is larger than the reference value (Nb). The reference values (Na) and (Nb) are set under the following conditions.

NaXP>L2...
...■NaX P> NbX P> Ll
・Old-■P: Belt per pulse (24
0) movement distance L1 pitch of run mark (241) L2 standby mark (242) and overrun mark (24
1) Distance [Hereinafter referred to as Margin Coarse Skin 0 Study As is clear from the above explanation, according to the present invention, when at least one of the paper jam signal and paper presence signal is set, the paper Since the paper in the storage section can be ejected without image formation processing, only unnecessary paper left wound around the belt can be forcibly ejected to the outside of the machine. Therefore, unnecessary belt rewinding operations are not performed.

[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,
11m is a block diagram of the control circuit, Figures 12 and 13,
Figure 14 a130, Figure 14b, Figure 15, Figure 16,
Figures 17a, 17b, 18, 19, 20
Figure 21, Figure 22a, Figure 22b, Figure 23a,
Figures 23b, 23c, 24a, 24b, and 25 are flow tilt diagrams showing control procedures, respectively. FIGS. 26 and 27 are flowcharts showing the control procedure of the second embodiment. (1) Copying machine body, (10) Photosensitive drum, (40) Paper refeed path, (100) Paper refeed unit, (120) Paper feed Switching 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, (SE3)...
Paper detection sensor, <5E5)... Open/close detection sensor.

Claims (1)

[Scope of Claims] 1. The paper discharged from the image forming apparatus main body can be sent to the image forming apparatus main body from the paper accommodating part after it is once stored in the paper accommodating part, and the paper accommodating part is connected to two belts. It includes a belt that is stretched between winding shafts and is wound back and forth, and when the belt is wound on one shaft, the paper is wound together with the belt on the shaft, and the belt is wound on the other shaft. In a paper winding type refeeding device that sometimes feeds out the paper that has already been wound up, a paper jam signal is set when there is paper in the paper storage section when the power is turned on to the paper refeeding device. , When a predetermined number of sheets with the first side copied in the duplex copy mode or the composite copy mode are stored in the paper storage unit, and the duplex copy mode or the composite copy mode is canceled while the paper is stored in the paper storage unit. a paper presence signal that is set when the paper is loaded and reset when all the stored paper is re-fed for second-side copying; and at least one of the paper jam signal and the paper presence signal. A paper refeeding device comprising: a control means capable of ejecting paper existing in a paper storage section without performing image forming processing when the paper is set.