JPH02213861A - Paper refeeding device - Google Patents

Abstract

PURPOSE:To timely and precisely control the finish of paper drawing-out processing by detecting an initial position mark given to a belt and stopping the paper drawing-out processing based on the detection. CONSTITUTION:When the belt 240 is rewound at the time of feeding paper again, the initial position mark 242 given to the belt 240 is detected at a part other than a taking up part by a detection means SE4. Such a state means that the belt 240 is set at an initial position where the paper can be housed (taken up) and simultaneously means that there is no paper housed in the belt 240. Then, the paper drawing out processing is stopped based on the detection signal of the initial position mark. Thus, it is easily and surely detected whether all the papers are drawn out from the taking up belt or not without directly detecting the paper and the stopping timing of the paper drawing-out processing is precisely controlled.

Description

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

Conventional Technology and Problems Conventionally, this type of paper refeeding device has been used to sequentially stack and store sheets of copied paper in a flat state in trays arranged approximately horizontally in five directions or in a vertical direction, and then to feed the sheets one by one from the tray. Send out sheets one by one (
It was configured as follows:

However, the paper is often heated and curled by the fixing device in the image forming device, so it is necessary to guide the paper one 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 that winds the paper together with a belt and then unwinds it during rewinding has not been proposed. According to this,
It is possible to reliably store and refeed sheets one by one. However, the problem here is the detection of paper stored in the belt. For example, it is possible to use an optical sensor to detect the paper wound around the belt as a transparent material, but the winding diameter of the force belt varies widely and is difficult to detect. Furthermore, even if mechanical detection means are used, the configuration will become complicated due to the same reason.
Have difficulty. However, in this type of paper refeeding device, it is important to detect whether all the paper has been completely fed out from the belt during paper refeeding.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to easily and reliably detect whether or not all the paper has been fed out from the winding belt without directly detecting the paper in a paper winding type paper refeeding device. The purpose is to make the timing of stopping processing accurate.

In order to achieve more than a means for achieving the object, the paper refeeding device according to the present invention includes (a) an initial position mark attached to the belt, and (b) an initial position where the belt can accommodate paper. (C) as the paper is being fed out from the belt, when the detection means detects that the belt has returned to the initial position, a paper feeding process is performed; It is characterized by comprising: a control means for avoiding a stop;

In the second configuration, when the belt is rewound during paper refeeding, the initial position mark attached to the belt is detected by the detection means at a portion other than the winding portion. In this state, the belt is used to store (wind up) the paper.
This means that the paper has been set in a possible initial position, and at the same time, it means that there is no paper stored. Then, based on the initial position mark detection signal, the sheet feeding process can be stopped.

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

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

[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 installed to be rotatable in the direction of the arrow (,), and around it are a main eraser lamp (11), a sub-charging chamber (12), and a sub-charging chamber (12). Eraser lamp (13), main charger (14)
, a magnetic brush type developing device M (15), a transfer charge w (16), a paper separation chamber (17), and a cleaning device (18). The photosensitive drum (10) is equipped with an eraser lamp <11), <13) and a broom electric chihe-jihe! (12) and (14), it is sensitized and charged, and the scanning optical system (20) shows the arrow (
b) An electrostatic latent image is formed on the surface by image exposure from the direction.

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 paper arranged horizontally. The size of the copy paper stored in each paper cassette (30), (32) is
32) is connected to the sensor (Psi>,
(PS2) and is identified based on the code assigned in advance. At the same time, the sensor (Psi)
, (PS2) also detects the presence or absence of paper in the cassettes (30), (32).

The paper in the upper cassette (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 to the transfer charge by discharge from (16), and separated from the surface of the photoreceptor drum (10) by AC discharge from separation charge (17). After that, it is sent to the fixing device (37) via the conveyor belt (36)', where the image is fixed, and then the discharge roller (
38), (39) to paper refeed unit (10), which will be described later.
0). Note that the photosensitive drum (10) after transfer
includes a cleaning device (18) and an eraser lamp (11).
) to remove residual toner and charge from the surface and prepare it for the next copying process.

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

The paper is fed from the paper refeed unit (100) to this path (4) with the image side already copied facing up during double-sided copying, and with the front and back sides reversed and facing down during composite copying.
0), is again supplied to the timing roller (35), and reaches the 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 in the paper refeed path (40) and the paper transport system in the paper refeed unit (100), which will be described below. Further, the developing motor (M2) drives the image forming section including the photosensitive drum (10) and the developing device (15).

[Configuration and operation of paper refeeding unit] This paper refeeding unit (100), as shown in FIG.
A paper feed switching unit (120) receives the paper ejected from the copying machine main body (1) and switches the paper feed mode as appropriate according to the copy mode, and a paper feed switching unit (120) that receives the paper ejected from the copying machine main body (1) and switches the paper feed mode as appropriate according to the copy mode, and a paper feed switching unit (120) that Winding allowance paper storage section (2
00), an intermediate conveyance unit (180) that feeds the paper to the paper storage unit (200), and a refeed unit that feeds the paper stored in the paper storage unit (200) one by one to the paper refeed path (40). It consists of a paper section (320). Whether or not the paper refeeding unit (100) is attached to the copying machine main body (1) can be determined by checking the micro switch (1) provided on the copying machine main body (1).
MS) is detected by the on-2-off signal.

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

[Paper passing switching unit] The paper passing switching unit (120) is connected to the guy F 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), has an arc-shaped guide surface (125c) that guides the paper from the discharge roller (135>, (136) side) to the intermediate conveyance roller (190), (191) side.A third guide surface (125c) ) is attached with a resin flexible film (129) to serve as a paper guide.The tip of this flexible film (129>) is attached to the guide plate (123).
), and the sheet conveyed from the left in FIG. 2 is passed to the right [arrow < A) direction.
It has a function of guiding to the guide surface (125c).

The switching claw (125) is attached to a support shaft (
126) as a fulcrum, and as shown in FIGS. 6 and 7, the support shaft (126) is attached to the front frame (101).
) via an arm (127) to the plunger of a solenoid (SLI). Switching claw (125
) is set to the two-dot chain line position in FIG. 2 by the action of a return spring (not shown) when the solenoid (SL1) is turned off, and is set to the solid line position when the solenoid (SLI) is turned on.

Another switching claw (130) is a guide surface (130a) that guides the paper toward the paper output tray (175) side or the sorter (400) 111, and a circle that guides the paper toward the right side of the unit 1-(100). Arc-shaped guide surface 30b)
The frame (101
) and (111) are rotatably attached. This pivot 31) is the sixth
As shown in FIG.
The connection is broken through. When the solenoid <5L2) is turned off, the switching pawl (130) is set to the dotted chain line position in Figure 2 by the action of a return spring (not shown), and when the solenoid (SL2) is turned on, it is set to the solid line position. .

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

The paper discharge tray (175) is fully supported at one end by a support plate (176). The trailing edge of the paper completely discharged from the discharge rollers (135) and (136) is regulated and aligned by a regulating plate (177). Note that when this paper ejection tray (175) is attached, the switching claw (130) is connected to the unit (10).
0) and when the sorter (400) is attached, the paper discharge tray (175) and support plate (176) are removed and a switching claw (130) is attached in their place.

On the other hand, a photo sensor (SEl) is installed on the guide plate (123).
is attached via a bracket (133).

In this sensor (SEI), an actuator (134) protrudes 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 boot 1 bar 142a are attached to the support shaft (140) fixed to the back frame (111).
), a gear (142b) is rotatably mounted, and a pulley (
142a) and the gear (142b) are rotatable under one weight. The bracket (141) has a gear (144),
(145) and (146) are respectively rotatably mounted, the gear (144) meshes with the gear (142b), and the gear (145) meshes with the gears (142b) and (146). Support shaft of upper discharge roller (135) <137)
A gear (13B) is fixed to the end.

The bracket (141) is biased in the direction of arrow (c) by a coil spring (147), and is connected via a lever (148) to the plunger of a solenoid (SL3) fixed to the back frame (111). has been done. When the solenoid (SL3) is turned off, the bracket (1
41) is the arrow (c) due to the action of the coil spring (147>)
The gear (146>) meshes with the gear (13g).

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

A timing bell 1-(151>) is stretched between the timing pulley (142a) and other timing pulleys (150a) and (195a).
150a) is rotatably attached to a bracket <152) fixed to the back frame (111) via a support shaft <153>, and a gear (150b) rotatably provided as one unit with the pulley (150a) is attached to the bracket. It meshes with a gear (155) rotatably attached to the tip of (152). Further, the gear (155) meshes with a gear (50) fixed to the shaft end of the lower discharge roller (38) of the copying machine main body (1). Another timing pulley (195a) is connected to the intermediate conveyance roller ( 190) is fixed to the end of the support shaft (192).

In the above configuration, the conveyance system of the paper switching section (120) is driven by the main motor (Ml) within the copying machine main body (1). In other words, gear <50) at 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) to rotate the timing belt (151) in the direction of arrow (e). Furthermore, this rotation is caused by a solenoid (SL3
) is turned off, the gear (
142b).

<145) and <146> to the gear (138), and the upper discharge roller (135) and the waist are connected to the roller (138).
35a) is rotated forward in the direction of arrow (f). At this time, the gear (144) rotates idly. On the other hand, the solenoid (S
When L3) is turned on, the gear (144) meshes with the gear (138) as the bracket 1-(141) rotates, and the roller (135).

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

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

(Intermediate conveyance section) The intermediate conveyance section (180) includes a guide plate (181), a guide frame (182), an intermediate conveyance roller (190),
(191). Guide frame <1
82> is rotatably installed around the bin <183) as a fulcrum, and is normally set at the position shown by the solid line in FIG. 2 under its own weight. When this guide frame (182) is rotated in the direction of arrow (g), the intermediate conveyance path is opened, making it easier to remove jammed paper. The intermediate conveyance roller (190) is rotationally driven in the same direction [arrow (e) direction] by the timing belt (151), and the other roller (191) is attached to the guide frame (182), and the roller (190)
It contacts and rotates as a result.

On the other hand, a photo sensor (SE2) is mounted on the guide plate (181).
is attached via bracket 1-(185).

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

(Paper conveyance operation by the paper feed switching unit and intermediate conveyance unit)
When the paper is ejected after copying onto the surface, the solenoids (SLI) and (SL2) are turned off, and the switching claws (125) and (130) are held at the positions indicated by the dotted chain lines in FIG. Further, the solenoid (SL3) is also turned off, and the discharge rollers (135) and (136) are driven to rotate normally. When the sorter (400) is connected, the paper sent from the ejection rollers (38), (39) of the copying machine main body (1) to the paper feed switching section (120) is passed through the guide plate (123) and the switching claw. (125) guide surface (125a
), while being guided by the guide surface (1308) 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 fully 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 copied on the first side is ejected from the copying machine main body (1) in double-sided copy mode, the solenoid (SLI)
) is turned on, the switching claw (125) is fully set to the solid line position, and the paper is intermediately transported while being guided by the upper part of the guide plate (181) and the arcuate guide surface (125b) of the switching claw (125). Laura (190).

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

On the other hand, when the paper copied on the first side is ejected from the copying machine main body (1> in composite copy mode), the solenoid (
SLI) is off, solenoid (SL2) is on, switching claw (125) is at the two-dot chain line position, switching claw (130)
is set to the solid line position. In addition, the solenoid (SL3
) are initially turned off, and the discharge roller (135), (
136) can be driven in normal rotation. The paper is conveyed in the direction of the arrow (A) in the same way as in the single-sided copy mode, and the switching claw (1
30) between the paper refeed unit (100) and the sorter (400).

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

Thereafter, the solenoid (SL3) is turned on after a predetermined time after the trailing edge of the paper is detected by the sensor (SEL), and the discharge rollers (135) and (136) are switched from normal rotation to reverse rotation. This predetermined time means that the trailing edge of the paper is
This is the time it takes to move from the detection point of SEI) to an arbitrary position between the leading edge of the film (129) and the nip portion of the discharge roller (135) <136>. Ejection roller (1
35).

(136) is driven in reverse, the paper is conveyed in the opposite direction to the arrow <A) with its trailing edge leading, and the film (129) and the arcuate guide surface (125c) of the switching claw (125) The intermediate conveyance roller (190
).

(191> and sent to the storage section <200>.

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

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

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

(225), scraper (228), belt winding bobbin (230), belt unwinding bobbin (235)
), belt (240), idle roller (245)
, (246), (247), etc.

Basically, the paper that has been conveyed downward from the intermediate conveyance rollers (190) and <191) is transferred to the guide roller (210).
, pinched with pinch rollers (215>, <216),
Feed it to the lower bobbin (230). At this time, the bobbin (
230) is rotationally driven in the direction of the arrow (value), and 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 (m) to rewind the belt (240) onto the bobbin (235), and at the same time the paper is peeled off with a scraper (228) and fed upward. The guide roller (210), which rotates in reverse in the direction of the arrow (j゛), sends out the sheet to the refeeding section (320).

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

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

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

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

(331> is also driven.

A timing pulley (195b) integrated with the timing pulley (195a) fixed to the spindle (192) of the intermediate conveyance roller (190), and a timing pulley attached to the back frame (111) via the spindle (263). (261
A timing belt (260) is stretched between the gear (260) and the timing pulley (261a), and the gear (261b) which can rotate as one unit with the timing pulley (261a) is connected to the gear (260) of the clutch (CLI).
4) is engaged. The clutch (CLI) is attached to the end of the support shaft (332) of the registration roller (330). The clutch gear (264) is always rotatable, and is further engaged with a gear (266b) attached to the back frame (111) via a support shaft (265). This gear (266b) and a timing pulley (266a) which can be rotated as one body, 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 (
The pulley (271b) can rotate 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) is interchangeably interlockable and disconnected. That is, the bracket (273) is biased in the direction of arrow (i) by a coil spring (277), and is also biased by a solenoid (SL5) fixed to the back frame (111).
) is connected to the plunger. Solenoid (SL5
) is turned off, the bracket 1-(273) rotates in the five directions indicated by arrow (i) by 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 (2
73) rotates in the opposite direction to the arrow (i), and the gear (274) rotates in the opposite direction to the arrow (i).
) is the clutch gear (280) instead of the gear (276).
mesh with.

When the clutches (CLI>, (Cl3) are both in the OFF state, the rotation of the gears (264), (280) is controlled by the registration roller shaft (332) and the guide roller shaft (2).
11), and when turned on, the transmission of the rotation is cut off.

In the above configuration, the timing belt (151)
The driving force rotates the timing belt (260) in the direction of arrow (e) via the pulley (195a), (t9sb>), and also rotates the timing belt (260) in the direction of arrow (e)
), clutch gear (264), gear (266b), timing belt (268) via pulley <2668)
and rotates the belt (268) in the direction of arrow (e). Kira, this rotation is caused by the solenoid (SL5)
is turned off, the pulley (271a) and gear (2
71b), (275), and (276) to the clutch gear (280), and the guide roller (210)
is reversed to the arrow (j'). -5, Solenoid (S
L5), the arrow (i
), the gear (274) meshes with the clutch gear (280), and the guide roller (210) rotates normally in the direction of arrow (j).

The pinch rollers (215) and (216) are each installed to be rotatable as a result of the guide roller (210), and the pinch roller (215) is attached to the guide cover (201).
The pinch roller (216) is attached to the guide roller (
The arm (210) provided at both ends of the support shaft <211>
7) 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, there are bins (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) and the right side surface of the bottle (1).
203) engages with the lower end of the guide groove (112), and the magnetic plate (206) fixed to the upper end of the guide cover (201) is attracted to the magnet (114) provided on the frame (101), (111). By doing so, the set state is reached as indicated by the solid line in FIG. To open this guide cover (201) outward,
1) by the handle (207) provided on the top of the bottle (20
3) as a fulcrum, rotate the four guide covers (201) slightly in the direction of arrow (k) to release the coupling between the magnetic plate (206) and the magnet (114). At this time, the bottle (204) is moved and positioned at the vertical part of the guide groove (113). Next, when the guide cover (201) is pulled upward and the bottle (204) is disengaged from the guide groove (113), the guide cover (201) rotates in the direction of arrow (k) due to the moment due to its own weight. Guide cover (
201), the bottle (203) is finally inserted into the guide groove (1).
12) and the right side of the frames (101) and (111), the bin (205) is set in a substantially horizontal state as shown in FIG. (200) 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 refeed unit I-(100) without passing through the copying machine main body (1). Functions as a tray for forced ejection.Forcible ejection is performed by turning on a switch (SW) that can be operated from the outside by the operator when the guide cover (201) is opened, and this control will be explained later in the control procedure. It will be explained in detail as follows.

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

Next, the belt (240) for storing paper and the bobbins (230>, (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. Outer diameter shown by solid line, bobbin <2
35) has an outer diameter shown by a two-dot chain line. Belt (2
40) is fixed at both ends to the bobbin <230), (235), and idle rollers (245), (246), (
247), the rack is passed to the bobbin <230), (
235) and then rewound. In the initial state, the belt (240) is wound back toward the bobbin (235) (indicated by a solid line in FIG. 2). And the bobbin (
230) is rotationally driven in the direction of arrow (m), the bobbin (235) is driven to rotate in the direction of arrow (m'), and the belt (240) is wound around the bobbin (230), Finally, the 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 rotation and that can be controlled continuously.The drive mechanism will be explained here with reference to Figs. 41 and 5. do.

The motor (M3) is fixed to the back frame (111) via a bracket (281), and is rotatably mounted on a timing pulley (282) fixed to its output shaft and a support shaft (283) fixed to the back frame (111). A timing belt (286) is inserted between the installed timing pulley (284a).
) are installed. The support shaft (283) is further equipped with a gear.
284b), bracket]-(287), gear (288
a), (288b) is installed, Boo 1 bar 284a)
and gear (zsab) can rotate under one weight, and gear (
288a) and (288b) are rotatable under one weight. In addition, the support shaft (290) fixed to the back frame (111)
) are rotatably equipped with gears (291a) and <291b). A gear (284b) that rotates together with the boot 1 bar 284a) meshes with a gear (291a), and a gear (291b) that rotates together with this gear (2918) meshes with a gear (288a). Furthermore, this gear (2
The gear (288b) that rotates together with 88a) is the gear (293) rotatably attached to the bracket (287).
It meshes with.

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

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

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

In the above configuration, the bobbin (230) is
) direction to attach the belt (240) to the bobbin (23).
0), 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 boolean 1 bar 282) to the pulley (284a) via the timing belt (286).
Transmitted to gear (284b), gear (291a), <
291b), (288a), and (288b) to the gear (293), which moves the gear (293) in the direction of the arrow (p
＞Rotate in the direction. The rotation of gear (293) is
55a) and (255b) to the bobbin gear (232
) is transmitted to the bobbin support shaft (231), and the bobbin (23
0) is rotated in the direction of the arrow (m). At this time, the gear (251) is in the off position, and the bobbin (235) is driven to rotate in the direction of the arrow (mo) via the belt (240). On the other hand, in order to rotate the bobbin (235) in the direction of the arrow mark and rewind the belt (240) onto the bobbin (235), turn off the solenoid (SL4) and shift the gear (293) to the gear (2).
51) to drive the motor (M3) in the reverse direction in the direction of the arrow (0°). At this time, the rotational driving force of the motor (M3) is transmitted to the gear (293) according to the above-mentioned path, causing the gear (293) to rotate in the direction of the arrow (p'). The rotation of the gear (293) is transmitted to the bobbin gear (237) and the bobbin support shaft (236) via the gear (251), and the bobbin (235) is rotationally driven in the direction of the arrow (m>). ) is free and bobbin <230)
is driven to rotate by the arrow value ') via the belt (240).

By the way, the belt (240) is attached to the bobbin (230), (
When winding the bobbin (235) and unwinding it, simply use the other five bobbins (235).

When (230) is driven to rotate, the belt (240) becomes loose. Therefore, in this embodiment, as shown in FIG. 6 and FIG.
, (238) is stretched with a belt (257) having a circular cross section to apply a resistance force to the driven rotation of the other bobbin (235) and (230), thereby effectively preventing the belt (240) from loosening. did. That is, one bobbin (23
0) is rotated in the direction of the arrow (m), the other bobbin (235) rotates in the direction of the arrow (m) due to the tensile force of the bell l-<240).
It rotates in the direction of arrow (m) from the pulley (233) to the pulley (238) via the bell 1- (257).
) direction acts on the belt (257) and pulley (
233) or (238), and as a result, an appropriate tension is applied to the bell h (240), and the bells 1 to (240) become loose and do not sag. The same applies when the bobbin (235) is rotated in the direction of the arrow (m>), and the space when winding 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 bell (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 peripheral 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 (M3). 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) is attached to the end of the spindle (24g) of the idle roller (246).
and the support shaft (30) fixed to the front frame (101).
1) is equipped with gears (302a) and (302b) so as to be rotatable under one weight, and a support shaft (303) fixed to the front frame (101) is equipped with a gear (304a) and a pulse disk (304).
b) is rotatably provided as a single unit. Gear (30
0) meshes with gear (30211>, gear (302b)
meshes with the gear (304a).

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

(304g) to the pulse disk (3o4b), causing the disk (304b) to rotate. Pulse disk (3
A photosensor (SE7) is installed facing the circumference of the disk (3o4b), and the rotation speed of the disk (3o4b) 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 (
As SE4) is installed, an overrun mark (241) is placed on the bell (240) as shown in Figure 9.

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

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

In other words, as detailed in the control procedure later, the paper refeed unit (
When the power is turned on to the belt (240), the belt (240)
Wind back to the bobbin (235> side (return to initial position)
. In this case, Bell 1-(240) is indicated by the arrow (q'
) direction and stops driving the motor (M3) when the sensor (SE4> detects the standby mark (242).If the standby mark (242) has already passed the sensor (SE4), the motor (M3) is stopped. (100) is turned off, the next time the power is turned on, the sensor (SE4) cannot detect the standby mark (242) no matter how much the bobbin (235) is moved in the direction of the arrow. occurs. Therefore, in order to eliminate such a problem, in this embodiment, the standby mark (24
Overrun marks (241>, (24
1) was established. Therefore, the detection of the standby mark (242) by the sensor (SE4) not only stops the operation of rewinding the belt (240) to the bobbin (235), but also
Even if the return to the initial state of the belt (240) is started 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 bell 1-(240) is reliably stopped.

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

On the other hand, the end mark (243) is provided on the bobbin (235) side of the bell 1- (240).The paper storage belt (240) moves in the direction of the arrow (q), and the end mark (243) If the sensor (SE4) can detect it,
It is determined that the belt (240) has accommodated the capacity of paper. The length L3) of the end mark (243) is longer than the length in the storage direction of the maximum size paper stored in the belt (240>). When all the sheets already fed in the machine body (1) are stored in the belt (240), the end mark (243) is detected by the sensor (SE4).
The detection period is set to a length that continues to be detected.

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

The switching claw (225) is connected to the frame (101), (111
) and a pulley (227) fixed to the end of the support shaft (226), and a pulley (227) fixed to the end of the support shaft (211) of the guide roller (210). A bell 1- with a circular cross section is connected to the fixed pulley <212>.
(258) is stretched. When the guide roller (210) is rotated in the direction of the arrow (j>) during paper storage, the pulley (212), belt (258),
Boo 1 pa 227) rotates, and the switching pawl (225) is also urged in the direction of arrow (r), and is regulated by a stopper (not shown) to be held at the solid line position in FIG. 2. Switching claw (225)
At this solid line position, the paper that has been completely conveyed from the guide roller (210) is transferred to the belt (2) 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). 225a) to guide the roller to the nip between the guide roller (210) and the pinch roller (216).

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

The scraper (228) is made of a rigid thin plate,
A 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 lobby 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 in normal rotation in the direction of arrow (j),
The pinch rollers (215) and (216) are driven to rotate. Therefore, the paper is conveyed around the guide roller (210) in the direction of 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 scraper (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 (
After detection by SE2), the motor (
M3) is driven forward in the direction of arrow (0), and the bobbin <23
0) is rotated in the S direction by the arrow value). In this way, the paper is wound onto the bobbin (230) together with the belt (240).

After the trailing edge of the paper is detected by the sensor (SE2), the motor side 3) 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 it as short as possible when stored in the belt (240), to prevent the winding diameter of the bobbin (230) from increasing, and to improve storage efficiency and space efficiency.

(Paper refeeding unit) The paper refeeding unit (320) includes a guide plate (321), a guide frame (325), and a guide plate (32) attached thereto.
9), registration rollers (330), (331), and the switching claw (220). As described above, the registration roller (330) is rotationally driven in the direction of the arrow (S) via the clutch (CLI) (see FIGS. 4 and 5). Regis) roller (331) is the guide frame (3
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, a photo sensor (SE3) is installed on the guide plate (321).
is attached via a bracket (322).

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

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

After all single-sided copied paper has been wound onto the bobbin (230), when the operator instructs to start refeed copying [turn on the print switch (61), see Figure 10], the solenoid (SL4) ) is turned off and 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 rotated in the direction of the arrow (m>).This causes the belt (
240) is completely unwound from the bobbin (230),
The rear end of the stored paper in the storage direction is peeled off from the surface of the belt (240) by the stiffness of the paper itself and the tip of the film (229) attached to the scraper (228), and the paper moves with the rear end in the storage direction at the front. It is then unwound from the bobbin (230). The paper is transferred to the idle roller (24) of the belt (240).
5) and the scraper (228), the idle roller (245) moves the bell 1-(
240) due to a sudden change in the direction of movement of the belt (240).
240). Furthermore, the paper is placed on the guide plate (219
) and the guide surface (225a) of the switching claw (225), and the guide roller (210) and the pinch roller (2
16). At this time, the guide roller (
210) is driven in reverse in the direction of arrow (j'). Therefore, the paper moves around the guide roller (210) in the direction of the arrow (j
') direction, and the guide surface (220) of the switching claw (220)
220b) and the guide plate (321) and reaches the registration roller (330) <331>. The rotation of the registration rollers (330) and (331) can be stopped by turning on the clutch (CLI) just before the leading edge of the paper in the refeeding direction reaches the guide roller (210) and the bobbin (
235) continues to rotate. Therefore, the leading edge of the paper collides with the nip portion of the registration rollers (330) and (331), forming a slight loop. When this loop is formed, the clutch (Cl3) is turned on to stop the rotation of the guide roller (210), and the motor (
M3) is turned off to stop the rotation of the bobbin (235). Control here is performed based on a combination of a paper leading edge detection signal from a sensor (SE3) and a timer.

Next, the clutches (CLI) and (Cl3) are turned off, and the motor (M3) is turned on, so that the registration roller (
330).

(331), the guide roller (210) is completely rotated, and the paper is moved to 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 are completely unwound from the bobbin (230), control is performed to rewind the belt (240> to the bobbin (235) and set it to the initial state.

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

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

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

That is, 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 (20
0), the direction of the curl is opposite to the curvature of the photoreceptor drum (10), and the paper can be easily separated from the photoreceptor drum (10). becomes.

[Operation Panel] As shown in FIG. 10, the operation panel (60) is installed on the upper front part of the copying machine body (1), and has a print key (61) for starting the copying operation and a multi-copying operation. An interrupt key (62) for temporarily interrupting the copy operation, a clear/stop key (63) for temporarily stopping the copy operation or canceling the set number, a numeric keypad (64) for setting the number of multi-copy 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.
, a group of magnification selection keys (71) for selecting the copy magnification;
A group of magnification display LEDs (7
2), Copy mode selection key (73) for selecting one-sided, two-sided, or composite copy mode, one-sided copy mode displayed ED (74), two-sided copy mode displayed L E D
(75) and a composite copy mode display LED (76).

[Control Circuit] Fig. 11 shows the control circuit of the copying machine, and shows the control circuit of the copying machine (1).
A first microcomputer (S
O) It 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 displays LED (68),
(70).

(72), (74)', (75), and (76) are connected via a decoder (82). The switch matrix includes 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), an attachment/detachment detection switch (MS) for the paper refeeding unit (100), etc. In addition, the output port of the CPU (80) has
A main motor (Ml), a developing motor (M2), a timing clutch, a paper feed clutch, a charging charger, a transfer charger, etc. are connected.

The CPU (90) has a paper detection sensor (S) at its input terminal.
EL), (SE2), (SE3), belt (240)
mark detection sensor (SE4), guide cover (20
1) The open/close detection sensor (SE5) and forced ejection switch (SW) are connected, and the output terminals are connected to the solenoids (SLI) to (SL5), clutches (CLI), and (Cl3) that drive the paper conveyance system. It is connected. The motor (MS) that drives the bobbins (230) and (235)
) is the circuit (Ql) connected to the CPU (90),
(Q2).

Constant speed control is performed in (Q3). The circuit (Ql) has a pulse disk (304b) that controls the rotation speed of the idle zero (246).
A signal from a sensor (SE7) detected via the sensor and a speed signal from either the output terminal (circle) or (P2) are input. The terminal (circle) outputs a speed signal for driving the bobbin (235), and the terminal (P2) outputs a speed signal for driving the bobbin (230).
) is output. Each of these signals is converted into a voltage value within the circuit (Ql), and the circuit (Q2
) is output to. On the other hand, the circuit (Q3) consists of a pulsed disc (
304b) outputs a reference waveform voltage for maintaining a constant rotation speed to the circuit (Q2). In the circuit (Q2), the circuit (
The voltage values from Ql) and (Q3) are compared to form an appropriate waveform voltage and output to the motor (MS). Further, the moving speed of the belt (240) driven by the motor (MS) is set slightly higher than the paper transport speed when storing paper, and is set slightly lower when refeeding paper.

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

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

(Description of 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)
When the occurrence of a jam is detected in the jam detection/processing subroutine executed in , the set is complete, and when the jammed paper removal process is confirmed, the paper is reset. Under the control of the CPU (90), the flag is set when the occurrence of a jam is detected.
See step (5384), and is reset upon completion of jam processing [see step (S392)].

Jam A flag: When the power is turned on to the paper refeeding unit (100), this flag indicates that paper that the previous operator forgot to take out remains in the storage unit (200) [Set in step (S234), (5392).

(5412) to reset.

Jam B flag: Displays that a jam has occurred during paper conveyance in the paper refeeding unit (100) [Step (S374), <5376>, (5378), (
5381) and reset in step (5392)].

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

Single-sided mode flag: Instructs execution in single-sided copy mode (set in step (S23), (530), reset in step (S27)).

Double-sided mode flag 2 Instructs execution of first side copy in double-sided copy mode [set in step (527), reset in steps (523) and (S29)].

Composite mode flag 2 Instructs execution of first side copy in composite copy mode [set in step (529), reset in step <523), (530)].

Upper and upper paper paper lag: Instructs to feed paper from the upper paper cellar 1-(30) [Set in step (S46), (5412), reset in step (545), <5116>]
.

Underprint paper flag: Instructs to feed paper from lower cassette 1-(32) [set in step (S45), set in step (5)
46), reset with (5116)].

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

Empty signal: Paper cassette (30), (32)
Display that there is no paper left [Step (S5)]
5) and reset in step (551)].

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

(S64), reset at (596).

Determined flag: Number of copies per original (number of copies) and storage unit (200) when duplex or composite copy mode is selected
Displays the completion of comparison with the number of sheets that can be accommodated (N) [Set in step (580), step (574), (
583)].

Copy operation permission flag 2 Indicates that copy operation is possible without any problems. In particular, the number of sheets that can be accommodated (N
) is reset if the number is set and prohibits the copy operation [Set in step (579), step <580)
So reset.

Paper feed prohibition signal: Displays that Bell 1- (240) has been wound up to the end on the bobbin (230), and prohibits further operation [set in step (5303), steps (5116), (5412) ) and reset.

Paper feed wait signal: Displays that the paper refeeding unit 1-(100) is not ready to accommodate paper and prohibits paper feeding operation [set in step (S227>, set in step (S227);
S249), reset in (S255)].

Paper presence signal: When the number of sheets (number of copies) is stored in the storage section (200), a cell is issued [step (5310):], and all the sheets are ejected from the storage section <200>. It is reset when [Step (53
08), (S363), (5412).

Preprocessing flag 2 The paper refeed unit (
100) to return to its initial position [set in step (5223), reset in steps (5249) and (S255)].

Standby flag: Displays that Bell 1-(240) has returned to its initial position [Step (S249).

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

Drive request signal, main morph (
Ml) [Step (S227), (
5293>.

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

(5310), (S329), (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), (5
255)].

Position A flag: Displays that the region (L2) of the belt (240) is located at the detection point of the sensor (SE4) [Set in step (S246), step (5249)
) to reset].

Position B flag: Displays that the area (Ll) of Bell 1-(240) is located at the detection point of the sensor (SE4) [Set in steps (5252) and (5254),
reset in step (5255)].

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

Paper refeeding flag: Indicates that paper is being refeeded [Set in step (5323), step (5
329), reset in (S363)].

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 (S
l), the random access memory (R
AM), initialize registers, timers, counters, etc., and perform initial settings to put each device into the initial mode. Next, in step (S2), the CPU (90
), etc., and when the end of the initial communication is confirmed in step (S3), an internal timer is started in step (S4). This internal timer not only determines the time required for the main routine, but also functions as a criterion for determining the end of counting of each timer used in the following subroutines.

Next, in step (S5), it is determined whether the jam flag is 10'' or not. If it is set to "1", the process immediately moves to step (512), and if it is reset to "0", each subroutine of steps (S6) to (513) is sequentially called.

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

After calling each subroutine, 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 completely reset to "0", it is determined in step (522) whether or not the paper refeeding unit (100) is fully installed based on the on/off signal from the microswitch (MS). If not installed, step (
At S23), turn on the LED (74), set the single-sided mode flag to rl, and turn on the LED (75).
(76) is turned off, the duplex mode flag and the composite mode flag are reset to "0", and this subroutine ends. On the other hand, if it is attached, step (524)
In step S25, it is determined whether the selection switch (73) is set to the low edge or not, and whether the paper refeed flag is "o" or not.

If both are YES, that is, the copying machine main body (1) is not in the copying operation [YES in step (521)], and the selection switch Each time (73) is turned on, steps (526) and subsequent steps are executed to switch the copy mode.

The copy mode can be initially set to one-sided copy mode, and can then be switched to duplex, composite, or one-sided by rotation.

That is, in step (526), the single-sided mode flag is set to "1".
”, and if it is set to “1”, turn off L E D (74) in step (S27);
Turn on D (75) and set the single-sided mode flag to "
0" and set the duplex mode flag to 71. Set to .

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

When both the single-sided mode flag and the double-sided mode flag have been reset to "0°," L E is set in step (530).
D (76) is turned off, the LED (74) is turned on, the composite mode flag is reset to "0", and the single-sided mode flag is set to "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 the paper refeed flag is r□, and if it is reset to "0", step (
After confirming that the copy flag has been reset to 10'' in step S42>, it is determined in step S43 whether or not 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", the overprint paper flag is reset to "0" and the underprint paper flag is set to "1" in step (545). On the other hand, if it is determined that the top picture paper flag is r□ in step (544), the bottom picture paper flag is set to "0" in step (546).
”, -hi Set the paper feed flag to “1”. Thereafter, the size of the 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 (S43).
B).

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 (S49), it is determined whether the empty signal is an off-edge, and if it is not an off-edge, that is, the timing is not when the paper is fully replenished, then in step (550), it is determined whether there is no paper in the currently selected paper feed section. Determine whether or not. If there is paper, the empty signal is reset to "0" in step (551). On the other hand, if there is no paper, step (S52)
It is determined whether the copy flag is "1" or not. If it is set to "1" (if the copying operation is in progress), the stop flag is set to rl in step (553), instructing to temporarily stop the subsequent copying operation, and step (S54)
The set number (the set number of copies) is stored in the RAM. Furthermore, in step (555>) the empty signal r
Set to "l".

If it is determined in the step (S49) that the empty signal is on-edge, that is, if paper is replenished, the original number stored in the step (554) is again substituted for the set number. Further, in step (557), the number of copies that are insufficient at this time is calculated, and in step (S58), the stop flag is reset to "rO", thereby making it possible to restart the copying operation.

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

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

(1) When copying is not in progress, Initialize copy conditions when turned on.

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

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

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 copying of the first side in duplex or composite copy mode, > If you turn it on once when there is no paper in the paper feed section, it will set to the second side copy mode. .

ii) Paper is replenished in the paper feed section and the print switch (6) is pressed.
When 1) 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 (S62) whether or not the stop flag is "1".If it is set to rl, then step (563)
If it is determined that the copy flag is "10", that is, if the copy operation is not in progress, the stop flag is reset to "0" in step (S64), and the copy conditions are initialized in step <568).

When the stop flag is 10 [step (S62) No.], step S65> the stop flag is 10"
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 copying is in progress, the stop flag is set to "11" in step (S6B>), and the number of copies set at that time is set in step (S67). ) is stored in RAM.

FIG. 16 shows a subroutine for determining permission for a copy operation, which is executed in step (510) of the main routine of the CPU (80>).

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

When it is determined in step (571) that a copy operation is not in progress (the copy flag is "0"), the following steps are processed. It is determined in step (S72) 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 the paper has already been transferred to the re-feed copy operation, step (S74> resets the determined flag to r□), step (57).
In step 9), the copy operation permission flag is set in rIJ.

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). is 10''. If it is reset to r□, step (576
), the length in the transport direction of the selected sheet @ (L5) 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 conveying direction of stored paper L6: Toward belt (240) Note that the information in (L4) and (L6) is the interval between sheets when storing sheets in step (S2>
The data is sent from the CPU (90) to the CPU (80).

Next, in step (578), the number of sheets that can be accommodated (N) calculated using the formula 0 and the number of copies (number of copies) are compared, and N
If the number is ≧, the copy operation permission flag is set to "1" in step (S79). If the number is N, the copy operation permission flag is reset to rO in step (580), and the copy operation is prohibited. At the same time, set the determined flag to "
1”.

Further, even if the above-mentioned judgment is completed, if the number of sheets or the paper size is changed, the above-mentioned judgment is repeated again. That is, when it is determined that the determined flag is "1" in step (575), it is determined in step (581) whether the set number has been changed, and in step (582) it is determined whether or not the paper size has been changed. , if either is YES, step (58
In 3), the determined flag is reset to "0".

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

First, in step (SQL), it is determined whether the copy flag is "rO" or not. If it is reset to "O", that is, if copying is not in progress, the print switch (61) is turned on in step (S92). When 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 "0" in step (S94), and then step ( In S95), 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 "0" in step (S96), the original value that has been memorized is substituted in the set number in step (S97), and step (59B) is executed. ) to set the copy flag to "1". Immediately after determining that the stop flag is "0" in step (595), step (595)
98).

Next, in step (S99), it is determined whether the copy flag is "1" or not, and if it is reset to "rO", the process immediately moves to step (5108). If it is set to rl, it is determined in step (5100) whether the paper feed prohibition signal is rl. If it is set to "1", it means that a trouble has occurred in the paper refeeding unit (100), and in step (5101) the stop flag is set to "11", and in step (5105) the paper is currently being fed. The paper feeding operation is stopped after the paper feeding is completed. Also, step (5100
), if it is determined that the paper feed prohibition signal is r□, it is determined in step (5102) whether the stop flag is "1" or not.
process. Next, when the completion of paper feeding is confirmed in step (5106>), the number of paper sheets fed to date is substituted into 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 "0", it is determined in step (5103) whether or not the paper feed wait signal is "0", and if it is reset to "rO", the predetermined cassette 1 is
- Executes the paper feeding operation from (30) or <32) and moves to step (5108). Paper feed wait signal is IJ
If it is set to 6 days, the process immediately moves to step (5108).

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

If it is determined in step (5109) that the single-sided mode flag is "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 "O", 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 top picture paper flag and the bottom picture paper flag are reset to "0", the paper refeed flag is set to "11", and the copy flag and paper feed prohibition signal are respectively reset to r□. and terminate this subroutine.

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

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

(Control of paper refeed unit) FIG. 18 shows the main routine of 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 cpU (80).

Next, in step (5205), the jam flag is 10.
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.

In step (5206), an operation is performed to return the belt (240) to the initial position before the copying machine main body (1) starts the sheet feeding operation. In step (5207), the operation of discharging the paper to the paper discharge tray (175) or the sorter (400) and the operation of storing the paper in the storage section (200) are processed. In step (5208), the operation of refeeding sheets one by one from the storage unit (200) is processed. In step (5209), 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, it is determined in step (5221) whether the copy flag is "1" or not, and if it has been reset to "0", the process moves to step (S225), and if it is set to "rl", then step (5222 ) to determine whether the paper presence signal is off-edge. If it is off-edge, the storage part (20
It is assumed that the paper refeeding operation from step 0) has been completed, and step (
In step 5223), the preprocessing flag is set to "1", and the process moves to step (5225). If the paper presence signal is not OFF = 71, it is determined in step (5224) whether the preprocessing flag is "1" or not, and if it is set to "1", the process moves to step (5205). If it is reset to '0', the process moves to step (5231).

In step (5225), it is determined whether the standby flag is "0". If it is set to "1", the belt (240) has already been rewound to the initial position, so the process immediately moves to step (5231). If the standby flag is reset to 10, step (522
After confirming that the drive request signal is reset to "0" in step 6), the drive request signal is reset in step (5227).
Set the paper feed weight signal to 11" and turn the motor (H3)
is driven in the belt rewinding direction. At the same time, the state counter that can be used in the following step (5230) is set to "0".
and start timer A and trouble timer. Here, the bobbin (235) is rotationally driven in the direction of the arrow (rn), and the belt (240) is rotated in the direction of the arrow (rn).
5). Timer A will be explained in the subroutine of step (5230) (see FIG. 20). The l.rubble timer is for detecting a trouble in which the belt (240) does not move within a predetermined time when the motor (M3) is driven.

Next, in step (5228), it is determined whether the winding flag is on edge or not, and if it is on edge, the belt (240
) standby mark (242) or overrun mark (241) was detected by the sensor (SE4),
In step (5229), the solenoid (SL4), (S
L5) is turned on, the motor (M3) is driven in the belt winding direction, and a trouble timer is started. As a result, the bobbin (230) is rotationally driven in the direction of the arrow, and the belt (240) is wound around the bobbin (230). Then, in step (5230), the belt (2
40) is temporarily overrun to the initial position and then stopped.

Next, in step <5231>, if the paper refeeding flag is set to "Determine whether or not IJ.'1", then in step (5232) the paper is fed from the storage unit (200) according to the operator's selection. Perform a process to force the discharge.

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 (SF3) is turned on, it is determined that the paper presence signal is reset because the power was turned off before or during the copying process to the second side, and the paper presence signal is reset in step (5234).・Set the M A flag to 11.

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

In this subroutine, step (S227) is performed during preprocessing.
, (S229) executes control to turn off the driven motor (M3). The values of timers A and B used here are set under the following conditions.

Timer A > L2/V ・Old ・
・■Quima A>Timer B>Ll/V ・Old...
■■: Movement speed of belt (240) L1 pitch of Niover run mark (241) L2 standby mark (242) and overrun mark (24
1) The stopping process here is performed in step (5241) when the sensor (
Each time SF3) detects marks (241) and (242) and becomes on-edge, it increments the state counter in step (5242), and increments the state counter in step (5243).
), the value of the state counter is checked, and the following control is executed based on the value.

When the value of the state counter is "1", that is, after the motor (M3) is driven in the belt rewinding direction, the sensor (S
When the first on-edge of F3) is detected, it is determined in step (5244) whether the winding flag is "0" or not. If it is reset to r□, step (5245
), it is determined whether timer A has finished counting.

If the count is completed, the belt (240) is activated by the sensor (SF3) before the motor (M3) is driven in the rewinding direction.
) is located opposite the detection point of the standby mark (
242>, it is determined that the position is on the downstream side in the rewinding direction [within the range of area (L4)]. In other words, the sensor (SF3
) can be determined to be the standby mark (242), and step (S246) is detected.
) to turn off the motor (M3), set the winding flag and position A flag to 1", and set the state counter to "
Reset to 0゛.

=75=7 If low timer A has not finished counting, then bell) <2
40) facing the detection point of the sensor (SF3>) can be determined to be region (L2) or downstream of region (L2) in the rewinding direction, and timer B is started in step (5247).

Next, if it is determined in step (5244) that the winding flag is rIJ, 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 operation of the belt (240>).At the same time,
The winding flag and position A flag are reset to 10'', the standby flag is set to 11'', and the state counter is reset to ``θ'''. Also, the solenoid (
SF4) and (SF5) are turned off, and the drive request signal, paper feed wait signal, and preprocessing flag are reset to "0."

After starting timer B in step (5247), if the value of the state counter reaches "2", that is, if the second on-edge of the sensor (SF3) is detected,
After confirming that the winding flag has been reset to "0" in step (5250), proceed to step (5251).
It is determined whether timer B has finished counting. If the count has ended, wait for the third on-edge of the sensor (SF3), and if the count has not ended, the position where the belt (240) was facing the detection point of the sensor (SF3>) is in the area ( L2), and step (5252) is turned off.

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

At the same time, the winding flag and position B flag are set to "1", and the state counter is set to "o" + stiffness.

After determining that the 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 (SF3) is detected, the process proceeds to step (S253). ), it is determined whether the winding flag is rO. "If it is reset to OJ, turn off the motor (M3) in step (5254),
Set the winding flag and position B flag to "1" and reset the state counter to "0".On the other hand, if the winding flag is set to "1", step (5255
) to turn off the motor (M3), solenoid (SL4),
(SL5) is turned off, and the winding flag and position B flag are reset to "0".) - Set the standby flag to "1". Further, the state counter is reset to "0", and the drive request signal, paper feed wait signal, and preprocessing flag are reset to "O".

FIG. 21 shows a routine for the ejection/accommodation operation executed in step (5207) of the main routine of the CPU (90).

Here, in step (5281), it is determined whether the single-sided mode flag is "1", in step (5282), whether the refeed flag is "rl", and in step (5284), it is determined whether the duplex mode flag is "11" or not. The following processing is performed according to the copy mode being processed at that time.

When copying one side [YES at step (5281)], when copying the second side in duplex or composite copy mode [step (5281)]
5282), the paper is discharged straight to the paper discharge tray (175) or the sorter (400) in step (5283). When copying the first side in double-sided copy mode [YES in step (5284)], step (
In 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)
84)-1' N O], step (5286)-
r After the paper is switched back by the ejection rollers (135) and (136) and turned over, the storage section (200)
In step (5287), the paper is transported to the storage unit (20
0).

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

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

First, in step (5291), it is determined whether the copy flag is 11'' or not. If it is reset to ``0'', the process moves to step (5296), and if it is set to ``1'', the process proceeds to step (5292). When the on-edge of the main body ejection signal is confirmed, that is, when the leading edge of the copied paper reaches the ejection section of the copying machine main body (1), the drive request signal is set to 11 in step (5293). Next, step (5)
294), when the on-edge of the sensor (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 solenoids (SL4) and (SL5) are turned on in step (5295), and the motor (M3) is turned on.
Timer C and jam timer A, which determine the drive start timing, are started. Now the guide roller (210)
is rotationally driven in the direction of arrow (j), and motor (M3
), the bobbin (230) is ready to be driven.

Next, when it is confirmed in step (5296) that the timer C has finished counting, in step (S297) the motor (
Start a trouble timer to confirm that M3> is being driven normally, drive the motor (M3) in the winding direction, and reset timer C. After that, in step (5298), if the off-edge of the sensor (SF3) is confirmed, that is, the trailing edge of the paper is
When detected in step 3), in step (5299), a timer D that determines the off timing of the motor (M3) is started, the above-mentioned Jihe Mukuima A is reset, and the accommodation counter is incremented.

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

During processing here, the paper is transferred to the guide roller (210), pinch rollers (215), (216) and belt (240).
), guided by the scraper (228) and shown by the arrow (m>
The belt is wound together with the belt (<240) onto a bobbin (230) which rotates in the direction shown in FIG. And step (5300)
When it is confirmed that the timer D has finished counting, the motor (M3) is turned off and the timer D is reset in step (5301). Further, in step (5302), it is determined whether the sensor (SF4) is on-edge or not. If it is on-edge, at that point the sensor (SF4)
) 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 in step (5306) whether the copy flag is "1" or not, 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 has been reset to r□, 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 (531
0), and (5311), the accommodation counter is reset to ``0'' in step (5312). The count value is “
If it is 0'', this subroutine ends immediately.

Executing copy operation to the first side, step (5309)
When it is determined that the count value of the storage counter has become equal to the set number, the predetermined number of sheets have been stored in the bobbin (230), so the solenoid (SL4) is activated in step (5310).
>, (SL5) is turned off, the drive request signal is reset to "0", and the paper presence signal is set to 71. and reset the standby flag to "0"). Furthermore, the step (
After confirming that the stop flag has been reset to "0" in step 5311), the accommodation counter is reset to 0'' in step 5312, and this subroutine is ended.

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

First, in step (5321), it is determined whether or not the paper refeed flag is 11'', and if it is reset to r□, this subroutine is immediately terminated. 1", it is determined in step (S322) whether the copy flag is on-edge, and if it is on-edge, step (5323) is performed.
Set the paper refeeding flag and drive request flag to "1", reset the state counter to "0", and proceed to step (
5325). After that, in step (5324), it is determined that the paper refeeding flag is "1", and then step (
5325). In step (S325), the count value of the state counter is checked, and depending on the count value, the motor (M3), clutch (CLI),
(CL2) etc.

In the initial stage when the count value of the state counter is reset to "0"', it is determined in step (5326) whether the transport permission signal is "1" or not. “If it is reset to 0., move to step (5360) and set it to “1.”
If the stop flag is set to "0", it is determined in step (5327) whether the stop flag is "0" or not. ``If it has been reset to 0yo, prepare to refeed the paper.In other words, in step (5328), timer F determines the interval between sheets to be refeeded.
is started, and the state counter is set to "1".If the stop flag is set to "1", in order to temporarily stop the paper refeeding operation, the copy flag, paper refeeding flag, Set the drive request flag to “0”
” and turn off the motor (M3).

When the current value of the state counter is "1", it is determined in step (5330) whether or not the transport permission signal is "rl", and if it is set to "1", it is determined in step (5331).
Allow the timer F to continue counting, and proceed to step (53).
32) drives the motor (M3) in the rewinding direction, turns off the clutch (CLI), turns on the clutch (CL2), and sets a jam B timer for detecting the occurrence of a jam in the paper refeeding section (320). and state counter “
2”. Now the registration roller (330)
, (331) are stopped and the guide roller (210) is driven in the reverse direction in the direction of the arrow (j'), and 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 current value of the state counter is 2'', it is determined in step (S334) whether the transport permission signal is rlj, and if it is set to IJ, the count of the timer F1 jam timer B is started in step (5335). continue,
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 the count is reset to 0, the counts of the timer F and jam timer B are temporarily stopped in step (5337), and the clutch (CLI) is reset in step (5338).
Turn on to stop the guide roller <210) from reversing,
Turn off the motor (M3) and proceed to step (5339).

Next, when it is confirmed in step (5339) that the sensor (SE3) is on-edge, that is, when the leading edge of the paper fed out from the bobbin (230) is detected by the sensor (SE3), in step (5340) The jam timer B is reset and a new jam timer C and registration controller (3
30), starts timer G to determine the paper loop amount immediately before (331), and sets the state counter to “
Set to 3”.

When the current value of the state counter is "3", it is determined in step (5341) whether the transport permission signal is "1" or not, and if it is set to "1", step <5342)
In step (5343), the timer F, timer G, and jam timer C continue counting, and in step (5343), the clutch (CLI) is activated.
) 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 "0", 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), the clutch (CLI) is turned on, the motor (M3) is turned off, and the process moves to step (5346). Next, when it is confirmed in step (5346) that the timer G has finished counting, in step (S347) the clutch (CLI) is turned on, the motor (M3) is turned off, and the state counter is set to "4". Now, transfer the paper to the bobbin (2
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>, (331)), forming a slight loop.

When the current value of the state counter is "4", it is determined in step (5348) whether the transport permission signal is "11", and if it is set to "1", step (5349) is performed.
), the count of the above-mentioned timer F1 and jam timer C is continued, and the process moves to step (5351). Move to (5351). Next, step (5351)
When it is confirmed that the timer F has finished counting, in step (5352) the motor (M3) is restarted to be driven in the rewinding direction, the clutches (CLI) and (Cl3) are turned off, and the state counter is set to "5". Set to ゛.

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

When the current value of the state counter is "5", it is determined in step (5353) whether the transport permission signal is rl, □+゛..., and if it has been set to "rl", step
354) to continue counting the jam timer C;
In step <5355), the drive of the motor (M3) in the rewinding direction and the off state of the clutches (CLI) and (Cl3) are continued, and the process moves to step (5358). If so, in step (S356), the count of the timer C is temporarily stopped, and in step (5357), the count of the motor (M3) is stopped.
is turned off, clutches (C1l) and (Cl3) are turned on, and the process moves to step (5358). Next, when the off-edge of the sensor (SE3) is confirmed in step (5358), that is, when the trailing edge of the paper is completely detected by the sensor (SE3), the jam timer C is set in step (5359).
At the same time, the steto count is reset to "0". With this, one sheet of paper has been re-fed from the storage section (200) to the re-feed path (40) of the copying machine main body (1).

Next, in step (5360), when the on-edge of the sensor (SE4> is confirmed), that is, the standby mark (242) of the belt (240) is detected by the sensor (SE4), and the belt (240) is located at the terminal end. If it is determined that the rewind has been completed, the timer G is started in step (5361). At this time, the paper that is about to be re-fed is the last paper. The timer G is set to the time required for the trailing edge of the last sheet to pass through at least the nip portion of the registration rollers (330) and (331). Next, Stenbu (S36
In step 2), it is determined whether or not the count of the timer G has ended, and if the count has not ended or the timer G is not operating, it is determined in step (5364) that the stop flag is off-edge, and the step If it is determined in step (5365) that the copy flag has been reset to "o", the paper refeed flag is reset to "0" in step (5366). On the other hand, in the step (5362), the timer G
When the end of counting is confirmed, step (5363)
Reset the paper presence signal to "o" and motor (M3).
The flags f (CLI) and (Cl3) are set to t7, the paper refeeding flag is reset to "0", and the timer G is reset, and this subroutine ends.

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 apparatus is reset.

First, in step (5371), it is determined whether the jam flag is "OJ", and if it is set to "1", a jam has already occurred, so the process immediately moves to step (5383). If it is reset to “0”, step (53)
73), (S375), and (5377) for each jam timer A and B.

It is determined whether the count of C has ended or not, and if the end is confirmed, it is determined that a jam has occurred, and step (5374).

(S376), set the jam B flag to “1” in (5378).
．． and moves to step (5383). Further, in step (5379), a trouble timer is set [step (S227)].

(5229) A sensor (SE7) that determines whether or not the reference count has ended, and if the end is confirmed, monitors the driven rotation of the idle roller (246) in step (5380)
Determine whether or not there is a pulse input to. If there is no input, it is determined that the motor (M3) did not operate normally, and the jam 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 (S382), and this subroutine is ended.

In step (5383), the jam signal is sent to the CPU (80
), the jam flag is set to ``rl'' in step (5384). Jam signal is CPU (80)
is processed and displayed on the display section (65) of the operation panel (60). Furthermore, in step (5385) it is determined whether or not the jam eight flag is "rl", and if it is set to "1", in step (5386) it is confirmed that the discharge flag is reset to "O". , step (S387
) to stop the operation of all drive systems, and step (538
In step 8), 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 step (5385) that the jam 8 flag has been reset to "r□", then in this case the jam B flag is "r".
1. Since this is set, 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 detected by the sensor (SE5), and when an 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) has been closed. Then, in step (5391), the jam signal is reset. Further, in step <5392), all jam flags and jam timers are reset, and this subroutine is ended.

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

Here, based on the opening operation of the guide cover <201) and the ON operation of the switch (Sen), 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 eight flag is "1".
In step (5402), it is determined whether the paper presence signal is "1", and in step (5403) it is determined whether the copy flag is "0". Forced ejection of paper can only be executed when the jam flag is set to ``rl'' or when the paper present flag is set to ``1'' and the copy flag is reset to ``0''. be. If it is executable, step (54)
After confirming that the discharge flag is reset to "0" 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 completely turned off, this subroutine is terminated. The switch (SW) is operated by the operator, and when the on-edge is confirmed, the drive request signal is set to 11'' and the copy permission signal is reset to r□ in step (5407). At the same time, reset the paper refeed flag to "0",
Set the discharge flag to "rl" and turn the motor (M3)
is driven in the rewind direction.

As a result, the sheets stored in the bobbin (230) are completely unwound from the belt (240), and as shown in FIG.
10>, the paper is discharged from the pinch roller (216) onto the guide cover (201).

Next, in step (5408), it is determined whether the sensor (SE4) is on-edge, 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 bell 1- (240) is completed, and the drive request signal is set to "0." in step (5409). At the same time as resetting the motor (M3
) off. Furthermore, after confirming that the discharge flag is set to "1" in step <5410>, it is determined in step (5411) whether the sensor (SE5) is on-edge. The guide cover (201) is closed,
When the sensor (SE5) is on-edge, step (5)
412), set the copy permission signal to "1", reset the ejection flag and jam flag to "10", set the overprint paper flag to "11", 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 pre-processing subroutine (see FIG. 19) for returning the belt (240) of the paper storage section (200) to the initial position and the step (5230) in this subroutine are performed. In the belt drive stop processing subroutine (see Fig. 20) that can be executed at bell 1-(240
) was used to detect the amount of movement of timer A1 and timer B. If the moving speed of the belt (240) is not constant,
A pulse signal [corresponding to the amount of movement of the bell (240)] of the sensor (SE7) that motors the driven rotation of the idle roller (246) may be used in place of the timers A and B. Therefore, such a control procedure will be explained as a second embodiment. The control procedure here is specifically the same as that shown in FIGS. 12 to 25 above, and FIGS.
Control is performed based on the flowcharts shown in FIGS. 25 and 26 instead of the flowchart shown in FIG. 20.

Here, the pulse count of the sensor (SE7) is started at step (5227') and step (5247'), and whether or not 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...
...■NaXP>NbXP>Ll
-...■P: 1 to 24 bells per pulse
0) movement distance L1 overrun mark (241) pitch over L2 standby mark (242)? Distance from run mark (241) [hereinafter referred to as margin] Since the paper feeding process is stopped based on the belt winding diameter, whether or not all the paper has been fed out from the belt can be easily and accurately detected, so to speak, indirectly. The end of paper feeding processing can be controlled accurately and in a timely manner.

[Brief explanation of the drawing]

1 to 25 show an embodiment of a paper refeeding device according to the present invention, FIG. 1 is a schematic configuration diagram of a copying machine body equipped with a paper refeeding unit, and FIG. 2 is a paper refeeding unit. 3 is a partial configuration diagram showing the guide cover in an open state, FIG. 4 is a rear view of the back frame, FIG. 5 is a perspective view of the drive mechanism from the back frame side, and FIG. FIG. 7 is a front view of the front frame, FIG. 7 is a perspective view showing the internal structure of the paper refeeding unit from the front frame side, FIG. 8 is a perspective view showing other internal structures of the paper refeeding unit from the front frame side, and FIG. The figure is a plan view of the paper storage belt, FIG. 10 is a plan view of the operation panel,
Figure 1 is a block diagram of the control circuit, Figures 12, 13, 14a, 14b, 15, 16, and 17a.
Fig. 17b, Fig. 18, Fig. 19, Fig. 20, Fig. 2
District 1, Figure 22a, Figure 22b, Figure 23a, Figure 23b
23c, 24a, 24b, and 25 are flowcharts showing the control procedure, respectively. Second
6 and 27 are flowchart 1 diagrams showing the control procedure of the second embodiment. (1) Copying machine main body, (10) Photosensitive drum, (40) Paper refeed path, (100) Paper refeed unit, (120) Paper feed Switching part, (135)
, (136)...Use roller, (180)...Intermediate conveyance section, (200)...Paper storage section, (210)...
...Guide roller, (230), (235)...Bobbin, (240)...Paper storage belt, (241)...
... Overrun mark, (242) ... Standby mark, (320) ... Paper refeed section, (SE4), (
SE7)...Pulse generation 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, an initial position mark attached to the belt and a mark indicating that the belt is set at the initial position where paper can be accommodated are provided. and a control means for stopping the paper feeding process when the detection means detects that the belt has returned to the initial position while the paper is being fed from the belt. A paper refeeding device featuring: