JPH02213862A - Paper refeeding device - Google Patents

Abstract

PURPOSE:To effectively use the length of a belt by giving the marks of plural different patterns to the belt and deciding the position of the belt with the aid of comparing the detection signal of the mark with the moving distance signal of the belt. CONSTITUTION:A timer, a pulse counter which is synchronized with the movement of the belt or the like is used as the moving distance detection means of the belt 240. Besides, the position recognition marks 241 - 243 are given to the belt 240 at least by two different patterns corresponding to the stopping position of the belt 240. Then, the position of the belt 240 is decided by comparing timing that the mark 241 is detected and timing that the other marks 242 and 243 are detected with the moving distance of the belt 240, for example. Thus, the present position of the belt 240 is precisely detected and, specially, the belt 240 is precisely stopped at the fixed initial position at the time of rewinding.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to a paper refeeding device, especially a copying machine, a copying machine, a laser beam printer, etc., in which single-sided copied paper is taken out from the main body of an image forming device such as a copying machine, a laser printer, etc. The present invention relates to a paper refeeding device that once stores paper in a paper storage section and then feeds the paper from the paper storage section to the main body of an image forming apparatus.

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

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

Therefore, U.S. Pat.
No. 8-188260, No. 59-39561 (
As described in corresponding U.S. Pat. A paper winding-type refeeding device has been proposed in which paper is wound together with a belt and then fed out during rewinding. According to this,
It is possible to reliably store and refeed sheets one by one. However, the problem here is to accurately detect the current position of the belt, that is, the amount of winding or unwinding. In particular, in order to effectively use the length of the belt, it is necessary to rewind the belt to a certain position (initial position) when paper storage begins, and for this purpose it is important to accurately determine the belt position. .

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to accurately detect the current position of a belt in a paper winding type paper refeeding device, and to accurately stop the belt at a certain initial position particularly during rewinding.

Means and Functions for Achieving the Achievement In order to achieve the above object, the paper refeeding device according to the present invention includes: (a) position recognition marks of a plurality of different patterns attached to the belt; and (b) the position of the position recognition mark. means for detecting a recognition mark; (C) means for detecting the moving distance of the belt; and (d) comparing the detection signal from the mark detection means with the detection signal from the distance detection means; The invention is characterized by comprising means for determining the position of the object.

As the means for detecting the distance traveled by the belt, a timer or a pulse counter synchronized with the movement of the belt is used.

The position recognition mark is applied to the belt in at least two different patterns corresponding to the stop position of the belt.

The position of the belt can be determined in various ways.

For example, the timing at which one mark is detected and the timing at which another mark is detected are compared with the moving distance of the bell], and the position to the bell 1 is determined.

It is preferable that the belt position determination is used for control of stopping the belt at the initial position when the belt is not wound back to the initial position at the start of paper storage.

[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 1-(100), which is an embodiment of the present invention, has a paper section and a re-feed paper receiving section formed in the main body (1) of the copying machine. A sorter (400) is detachably attached to the right side of the paper refeeding unit (100).

[Schematic configuration and operation of copying machine main body] The copying machine main body (1) is equipped with a known copying mechanism and can be mounted on a desk (90). Inside, a photoreceptor drum (10) is provided approximately in the center so as to be rotatable in the direction of the arrow (a), and around it are a main eraser lamp (11), a ZUB charging CHIHE-G V (12), and a ZUBI laser. Lamp (13), main charge charge ~ (14
), a magnetic brush type developing device (15), a transfer charger (16), a paper separation chamber (17), and a cleaning device (18). Photosensitive drum
, (10) are sensitized and charged by passing through the eraser lamps (11), (13) and the charged chips (12), (14), and then are sensitized and charged by the scanning optical system (20) as indicated by the arrow (b). An electrostatic latent image is formed on the surface by imagewise exposure from the direction.

For copy paper, there are two paper feeders (top and bottom).
32). In this example, A4 size horizontal paper is placed in the upper cassette (30), and paper in the lower cassette (30) is placed horizontally.
32) contains sheets of B5 size horizontally arranged sheets. The size of the copy paper stored in each paper cassette (30), (32) is as follows:
32) The sensor (Psi >, (
PS2), it can be identified based on the code given in advance. At the same time, the sensor (Psi),
(PS2) also detects the presence or absence of paper in the cassettes (30) and (32).

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

On the other hand, at the bottom of the copying machine main body (1), a timing roller (35
) is provided with a refeed path (40) comprised of rollers (41), (42), etc.

The paper is fed into this path (40) from the paper refeeding unit (100) with the already copied image side facing up during double-sided copying, and with the front and back sides reversed and facing down during composite copying. Then, remove the timing roller (
35) and reaches the above-mentioned transfer section.

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

[Configuration and operation of paper refeeding unit] This paper refeeding unit (100), as shown in FIG.
A paper feed switching unit (120) receives paper ejected from the copying machine main body (1) and switches the paper feed format as appropriate according to the copy mode, and temporarily stores paper that has been copied on one side during duplex/composite copying. Rolled 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 refeed unit 1-(100) is attached to the copying machine main body (1) is determined by the on/off signal of the micro switch (MS) provided on the copying machine main body (1). .

The paper refeeding unit (100) also includes a paper output tray (1
75) or a sorter (400) can be selectively installed. FIG. 2 shows a state in which a paper discharge tray (175) is installed, and FIG. 1 shows a state in which a sorter (<400) is installed. The sorter (400) is well-known in terms of configuration and function, and it can handle a plurality of bins (41) stacked vertically.
Papers are distributed sequentially to 0). This sorter (400)
, the topmost bin (410) functions as a paper output tray during non-sorting.

[Paper passing switching unit] The paper passing switching unit (120) has a kite board (121), (
122).

(123), paper feeding direction switching claw (125), (130
), discharge rollers (135), (136), etc. The switching claw (125) is connected to the guide surface (1) that guides the paper toward the ejection rollers (135) and (136).
25a), the receiver transfers the loaded paper to the intermediate conveyance roller (190)
, an arcuate guide surface (12) that guides toward the (191) side.
5b), it has an arc-shaped guide surface (125c) that guides the paper from the discharge rollers (135) and (136) side to the intermediate conveyance roller (190) and <191> side. A flexible resin film (129) is attached to the third guide surface (125c) as a paper guide. This flexible film (129> has a guide plate (123) at the tip.
), and the paper conveyed from the left in Figure 2 is moved to the right [direction of arrow (A)].
However, from the right side, the paper is switched to the switching claw (125).
It has a function of guiding to the guide surface (125c).

The switching claw <125) is connected to the support shaft provided between the front frame (101) and the back frame (111) of the unit <100>.
126) as a fulcrum, and as shown in FIGS. 6 and 7, the support shaft (126) is attached to the front frame (101).
) via an arm (127) to the plunger of a solenoid (SLI). Switching claw (125
) is set to the two-dot chain line position in FIG. 2 by the action of a return spring (not shown) when the solenoid (SLI) is turned off, and is set to the solid line position when the solenoid (SLI) is turned on.

Another switching claw (130) has a guide surface (130a) that guides the paper toward the paper output tray (175) side or the sorter (400) side, and an arc-shaped guide surface <130b that guides the paper toward the right side of the unit (100>). ), and the frame (101), (1
11) It is rotatably mounted in between. This support shaft (13
1) is similar to the switching claw (125) in FIGS. 6 and 7.
As shown in the figure, it is connected via an arm (132> to the plunger of a solenoid (SL2>) provided on the front frame (101).
When solenoid (L2) is turned off, the solenoid (
When 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 supported at one end by a support plate (176). Cedar roller (13s>, (136)
The trailing edge of the paper first output from is regulated by the regulation plate (177).
Aligned. Note that when this paper output tray (175) is attached, the switching claw (130) is removed from the unit (100), and when the sorter (400) is attached, the υ1 paper tray (175> and support Board (176
) is removed and a switching claw (130) is attached in its place.

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

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

The upper 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.

The support shaft (140) fixed to the back frame (111) has a bracket 1-(141) and a timing pulley (UZa).
), a gear (142b>) is rotatably mounted, and a pulley (
142a) and the gear (142b) are rotatable under one weight. The bracket (141) has a gear (144),
(145) and (146> are each rotatably mounted, the gear (144) meshes with the gear (142b), and the gear (145) meshes with the gears (142b) and (146). Upper discharge roller (135) spindle (137)
A gear <138> is fixed to the end of the .

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. So1/
When the noid (SL3) is turned off, the bracket (
141) is the arrow (c) due to the action of the coil spring (147).
It rotates in the j5 direction, and the gear (146) meshes with the gear (138).

When the solenoid (SL3) is turned on, the bracket 41
) rotates in the opposite direction to the arrow (C), and the gear (144) meshes with the gear (138) instead of the gear (146>).

A timing bell 1-(151) is stretched between the timing pulley 1-bar 142a) and other timing pulleys (150a) and (195a). Timing pulley (
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 sheet switching section (120) is driven by the main motor (Ml) in the copying machine main body (1). That is, 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 pulley (150a), causing the timing belt (151) to rotate in the direction of arrow (e). Furthermore, this rotation is caused by a solenoid (SL3
) is turned off, the Boo 1 bar 142a) and the gear 42b).

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

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

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

(Intermediate conveyance section) The intermediate conveyance section (180) includes a guide plate (181), a guide frame (182), an intermediate conveyance roller (190),
(191). Guide frame (1
82) is installed so as to be rotatable about the pin (183), and is normally set at the position shown by the solid line in FIG. 2 under its own weight. By rotating this guide frame (182) 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 J 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
) and rotates as a result.

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

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

(Paper conveyance operation by the paper feed switching unit and intermediate conveyance unit)
When paper is ejected after copying is completed, the solenoid (SLI), (SL2> is turned off, and the switching claw (125), <130) is held at the position indicated by the dotted chain line 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 disconnected, the paper sent from the ejection rollers (38) and (39) of the copying machine main body (1) to the paper switching section (120) is transferred to the guide plate (123) and the switching claw. (125) guide surface (125a
), while being guided by the guide surface (130a) of the switching claw (130), a conveying force is applied by the discharge rollers (135) and (136), and sent to the sorter (400). When the paper output tray (175) is installed, the switching claw (
130) has been removed, and the paper is υ[output roller (1
35>, (136) directly onto the paper output tray (175).

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

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

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

On the other hand, if the paper discharge tray (175) is attached, the switching claw (130) is removed and the paper is guided onto the paper discharge 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 is the time it takes for the trailing edge of the paper to move from the detection point of the sensor (SEI) to an arbitrary position between the leading edge of the film (129) and the nip portion of the discharge rollers (135) and (136). It is. Ejection roller (
135).

(136) is driven in the reverse direction, the paper is conveyed in the opposite direction to the arrow (A) with the trailing edge leading so far, and the film (129) and the arc-shaped guide surface 25c of the switching claw (125) ) while being guided by the intermediate conveyance roller (190)
.

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

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

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

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

(225), scraper (228), belt winding water bottle (230), belt unwinding bobbin (235)
, Held (240), Idol Roller (24!5),
(246), <247), etc. Basically, the paper conveyed from the intermediate conveyance rollers (190) and (191) to the bottom 5 is transferred to the guide roller (210).
, pinch rollers (215) and (216),
Feed it to the lower bobbin (230). At this time, the bobbin (
230) is rotated in the direction of the arrow (m>), and the paper is wound onto the pobbink 230) together with the belt (240). When refeeding paper, move the upper bobbin (235) with the arrow <
m) direction to rotate the belt (240) to the bobbin (2).
35), and at the same time send the paper to the scraper (228).
The sheet is peeled off and fed upward, and sent out to the refeeding section (320) from a guide roller (210) that rotates in reverse in the direction of the arrow (j).

The switching claw (220) has pins (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 that has been conveyed will be 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 (195a) and a timing pulley (195b) integrated with a timing pulley (195a) fixed to a spindle (192) of the intermediate conveyance roller (190), and a timing wheel mounted on a back frame (111) via a spindle (263). Pulley (261
A timing bell 1-(260) is stretched between the gear (260) and the timing pulley (261a), and a gear (261b) that can rotate integrally with the timing pulley (261a) is attached to the gear (2) of the clutch (CLI).
64). The clutch (CLI) is attached to the end of the support shaft (332) of the registration roller (330). The clutch gear (264) is always rotatable, and is further engaged with a gear (266b) attached to the back frame (111) via a support shaft (265). The timing pulley (266a) is rotatable as one unit with this gear (266b), and the timing pulley (266a) is rotatably mounted on a support shaft <270) fixed to the back frame (111).
A timing belt (268) is stretched over 271a). A gear (271b) is attached to the support shaft (270).
, 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
>, (276) are each rotatably mounted, and the gear (275) meshes with the gears <271b), (276). A clutch (Cl3) is attached to the end of the support shaft (211) of the guide roller (210), and the clutch gear (280) is connected to the gear (2) of the bracket (273).
Either 74) or 276 can be engaged interchangeably. That is, the bracket (273) is biased in the direction of arrow (i) by 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 completely off, the bracket (273) rotates in the direction of arrow (i) under the action of the coil spring (277), and the gear (276) meshes with the clutch gear (280). When the solenoid (SL5> is turned on, the bracket 1-(27
3) rotates in the opposite direction to the arrow (i), and the gear (274>
meshes with the clutch gear (280) instead of the gear (276).

When the clutches (CLI) and (Cl3) are both off, the rotation of the gears (264) and (280) is controlled by the registration roller shaft (332) and the guide roller shaft (21).
1), 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 pulleys (195a) and (195b), and also
), clutch gear (264>), gear (266b), timing belt (268) via boot (266a)
and rotates the belt (268) in the direction of arrow (e). Furthermore, this rotation is caused by the solenoid (SL5)
is turned off, the gear (271a) and gear (271a) are turned off.
71b), (275), and (276) to the clutch gear (280), and the guide roller (210)
is reversed to the arrow (j'). On the other hand, the solenoid (SL
5), the arrow (i) of the bracket (273)
As the gear (274) rotates in the opposite direction, the gear (274) meshes with the clutch gear (280), and the guide roller (210) rotates normally in the direction of arrow <j.

The pinch rollers (215) and (216) are each installed so as to be rotatable as a result of the guide roller (210) = 24, 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, the bins (203) and (204>) are 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, and move the guide cover (201) itself in the direction of the arrow (
k) direction to release the coupling between the magnetic plate (206) and the magnet (114). At this time, the 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 (2)
01), the bottle (203) is finally in the guide groove (11).
2) and the right side of the frames (101) and (111), the bin (205) is set in a substantially horizontal state as shown in FIG.
Open the paper storage section (200).

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 1-(100) without passing through the copying machine main body (1). Functions as a forced ejection tray. Forced ejection is executed by turning on a switch (SW) that can be operated from the outside by an operator when the guide cover (201) is opened, and this control will be described in detail later as a control procedure.

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

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

The bobbins (230) and (235) are respectively attached to spindles (231) and (236) rotatably mounted between the front frame (101) and the back frame (111), and the bobbin (230) is shown in FIG. 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 bobbins (230), (235), and idle rollers (245), (246), (
The rack is passed to bobbin (230), (247),
235) and then rewound. In the initial state, the belt (240) is wound back toward the bobbin (235) (indicated by a solid line in FIG. 2). And the bobbin (
230) is rotated in the direction of the arrow (m), the bobbin (235) is driven to rotate in the direction of the arrow (m), and the belt (240) is wound around the bobbin (230), Finally the bobbin (230).

(235), the belt (240) is not shown with a two-dot chain line, and the shape 7
, 1. Thereafter, in order to return to the initial state, the bobbin (235) is rotated in the direction of the arrow (m>), and the bobbin (230) is driven and reversed in the direction of the arrow (m').

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

The motor (M3) is fixed to the back frame (111) via a bracket (281>), and is rotatable around a timing pulley (282) fixed to its output 1 and a spindle (283) fixed to the back frame (111). The timing belt (28
6) is stretched. The support shaft (283) further includes a gear (284b), a bracket 1-(287), and a gear <288
a), (288b) are installed, and the pulley (284a)
and the gear (284b) can be rotated by one weight, and the gear (284b)
288a) and (288b) are rotatable under one weight. In addition, the support shaft (290) fixed to the back frame (111)
gears (291a) and (291b>) are rotatably attached to The rotating gear (291b) meshes with the gear (288a).
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), a gear that can be rotated according to body weight (255
a) and (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 (253).
5a), and the gear (255b) meshes with the bobbin support shaft (23
1) meshes with a gear (232) fixed to the end.

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

In the above configuration, the belt (240) is attached to the bobbin (230) by rotating the bobbin (230) in the direction of the arrow (m).
To wind it up, turn on the solenoid (SL4), engage the gear (293) with the gear <253), and turn on the motor (M3).
) is rotated in the direction of arrow (0). At this time, the rotational driving force of the motor (M3) is transmitted from the pulley (282) to the boot 1 bar 284a) and the gear (284b) via the timing belt (286), and the gears (291a) and (2
91b), (288a), (288b) to the gear (293), and the gear (293) is
direction. The rotation of the gear (293) is caused by the rotation of the gear (25).
5a), bobbin gear (232) via (255b)
, is transmitted to the bobbin support shaft (231), and the bobbin (230
) is rotated in the direction of arrow (m). At this time, the gear (
251) is the hook, and the bobbin (235) is the belt (
240) and rotates according to the arrow (m'). on the other hand,
To rotate the bobbin (235) in the direction of the arrow (m) and rewind the belt (240) onto the bobbin (235), turn off the solenoid (SL4) and 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, and rotates the gear (293) in the direction of the arrow (p). ) to the bobbin gear (237) and the bobbin support shaft (236), and rotates the bobbin (235) in the direction of arrow (m). At this time, the gear (253) is free and the bobbin (230)
is driven to rotate in the direction of the arrow (m') via the belt (240).

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

When (230) is driven to rotate, the belt (240) becomes loose. Therefore, in this embodiment, as shown in FIGS. 6 and 7, the bobbin support shaft < 231
>, A bell 1-(257) with a circular cross section is stretched over (238) to apply a resistance force to the driven rotation of the other bobbin (235) and (230), effectively preventing the belt (240) from loosening. It was decided to. That is, one bobbin (
230) is rotated in the direction of the arrow (m), the other bobbin (235) is driven to rotate in the direction of the arrow (m') by the tension of the belt (240), but the belt 1- (257) to the pulley (238) with the arrow (
m) Rotational force in 5 directions acts, slipping occurs between the belt (257) and the pulley (233) or (238), and as a result, moderate tension acts on the belt (240), causing the belt to 240) will not loosen or sag. The same applies when the bobbin (235) is driven to rotate 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, attach the bell 1-(240) to the bobbin (230).
) and is temporarily stored here. At this time, the outer diameter of the belt (240) increases as more paper is accommodated. Therefore, when the motor (M3) is driven at a constant rotation speed, the moving speed (paper storage speed) of the belt (240) also increases, and the difference with the paper transport speed at the intermediate transport section (180) gradually increases. Therefore, in this embodiment, the belt (24
An idle roller (246) rotates as a result of the movement of
) is coated with a high friction material such as rubber material,
After ensuring the belt followability of the idle roller (246), the driven rotational speed of the idle roller (246) is detected, and this is fed back to the drive of the motor <M3>, and the moving speed of the belt (240) (paper control so that the accommodation speed) remains constant at all times.

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

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

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

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

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

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

In other words, as detailed in the control procedure later, the paper refeed unit (
When the power is turned on to the belt (240), the belt (240)
Rewind to the bobbin (235) side (return to initial position)
. In this case, the belt (240) is indicated by the arrow (q゛) in Fig. 9.
direction, and the sensor (SF3) reaches the standby mark (
242), the drive of the motor (M3) is stopped. If the standby mark (242) has already passed the sensor (SF3) and the power to the unit (100) is turned off, the next time the power is turned on, the bobbin (235) will be moved in the direction of the arrow (m). Even if the sensor (SF3) is driven, a problem arises in that the standby mark (242) cannot be detected by the sensor (SF3). Therefore, in order to eliminate such a problem, in this embodiment, the standby mark (24
On the upstream side in the belt return direction of 2), there are overrun marks (241), (24
1) was established. Therefore, the detection of the standby mark (242) by the sensor (SF3) not only stops the operation of rewinding the belt (240) to the bobbin (235), but also
Even if the belt (240) starts returning to its initial state from the time when the standby mark (242) has already passed the detection point of the sensor (SF3), the overrun mark (241), ( 241), the return operation of the belt (240) is reliably stopped.

By the way, the width of the standby mark (242), overrun mark (241>, (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 (SF3) and the timer.

On the other hand, the end mark (243) is provided on the bobbin (235) side of the bell 1- (240). When the belt <240) moves in the direction of the arrow (q) when storing paper, and the end mark (243) is detected by the sensor (SF3), it is determined that the belt (240) has stored the capacity minus the 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), that is, the end mark (243) is
The detection of the end mark (243) by the sensor (SF3) can still continue until all the sheets already fed in the copying machine main body (1) are stored in the bell 1- (240) from the time when it is detected by SF3). The length is set.

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

The switching claw (225> is the frame (101), (111)
) and a pulley (227) fixed to the end of the support shaft (226) and the end of the support shaft (211) of the guide roller (210). A belt with a circular cross section (
258) is installed. When the guide roller (210) loses its rotational drive in the direction of arrow (j) when storing paper, the pulley (212), belt (258), and pulley (227) rotate in conjunction with this, and the switching claw (225) also rotates. Arrow (
r) direction, and is regulated by a stopper (not shown) and held at the position shown by the solid line in FIG. At this solid line position, the switching claw (225) transfers the paper conveyed from the guide roller (210) to the belt (24) using its guide surface (225a).
0) and the scraper (228). On the other hand, when refeeding the paper, the guide roller (210) will move in the direction of the arrow (j゛).
When the switching pawl (2
25) is urged in the direction opposite to the arrow (r) through a similar path, is regulated by another stopper (not shown), and is held at the position indicated by the two-dot chain line, so that the paper fed out from the bell (240) is guided to the guide surface. (225a) at the guide roller (2
10) and the pinch roller (216>).

As described above, when the guide roller (210> is driven to rotate forward and backward in the arrow (j) or (j') direction, the bell) (
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 stuck 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 h (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 of the sheet, and guides the paper that is not being accommodated or the paper that is 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 contacts the guide surface (220a) 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 (z2sa) of the switching claw (225) set at the solid line position, It is conveyed downward between the scraper (228) and the straight part of the heald (240) that connects the idle roller (246) and the bobbin (230). 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 (o), and the bobbin (23
0) is rotated in the direction of arrow (m). In this way, the paper is wound onto the bobbin (230) together with the belt (24,0).

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

As described above, the reason why the bobbin (230) is stopped when one sheet of paper is stored and the bobbin (230) is driven intermittently is to keep the distance between the sheets that can be ejected from the copying machine main body (1) from the belt. When storing the bobbin (240), it is made as short as possible to prevent an increase in the winding diameter of the bobbin (230) and to improve storage efficiency and space efficiency.

(Paper refeeding unit) The paper refeeding unit (320) includes a guide plate (321), a guide frame (325), and a guide plate (32) attached thereto.
9), registration rollers (330), (331), and the switching claw (220). As described above, the registration roller (330) is rotationally driven in the direction of arrow (s) via the clutch (CLI) (see FIGS. 4 and 5). The registration roller (331) is attached to the guide frame (3
25) and is rotatably attached to the registration roller (330).
) and rotates as a result. Guide frame (325)
is the support shaft (326) between the frames (101) and (111).
The guide frame (182) and the guide cover (201) are released and then rotated upward to open the paper refeed path.

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

This sensor (SE3) has an actuator (323) that connects the guide surface (220b) of the switching claw (220) with the guide plate (
321) and detects 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 of the paper that has been copied on one side has been wound onto the bobbin (230), when the operator instructs to start refeed copying [turn on the print switch (61), see Figure 10], solenoid (SL4) is activated. is turned off and the gear (293
) is engaged with the gear (251), the motor (M3) is driven in the reverse direction in the direction of the arrow (0°), and the bobbin (235) is rotationally driven in the direction of the arrow (m). With this belt (2
40) is rewound from the bobbin (230), and the rear end of the stored paper in the storage direction is pushed against the belt (240) by the stiffness of the paper itself and the tip of the film (229) attached to the scraper (228). The paper is peeled off from the surface and is fed out from the bobbin (230) with the rear end in the storage direction leading. The paper is transferred to the idle roller (245) of the belt (240).
) and the scraper (228), the belt (24
The direction of movement of belt (24) can be changed rapidly.
0). Further, the paper is guided by the guide plate (219) and the guide surface (225a) of the switching claw (225), and the paper is guided by the guide roller (210) and the pinch roller (216).
) is sent between. At this time, the guide roller (21
0) 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 (22
0b) and the guide plate <321>, and reaches the registration rollers (330) and (331). The rotation of the registration rollers (330) and (331) is stopped by turning on the clutch (CLI) just before the leading edge of the paper in the refeeding direction arrives, and the rotation of the registration rollers (330) and (331) is stopped by turning on the clutch (CLI).
235) has continued 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. Once this loop has been formed, the clutch (Cl3) is turned on to stop the rotation of the guide roller (210), and the motor (
M3) is turned off to stop the rotation of the bobbin (235). Control here is performed based on a combination of a paper leading edge detection signal from a sensor (SE3) and a timer.

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

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

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

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

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

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

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

On the other hand, in the composite copy mode, the paper is reversed by controlling the forward and reverse rotation of the ejection rollers (135) and (136), and the first side is turned to the left in FIG. 200), and is wound onto a belt (240>) with the first surface facing outward.At this time, a curl is formed so that the first surface is facing outward.Then, after being re-fed, 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 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 (72) for displaying the selected magnification.
), copy mode selection key (73) for selecting one-sided, two-sided, and composite copy mode, one-sided copy mode display LED (74), two-sided copy mode display L E D
(75) and a composite copy mode display LED (76).

[Control circuit] Figure 11 shows the control circuit of the copying machine, and shows the copying machine main body <1)
The first microcomputer (8
0>, a second microcomputer (90) which controls the operation of the paper refeed unit (100).

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

(72), (74)', (75), <76> are connected via a decoder (82). The switch matrix consists of each key (61) to <6 on the operation panel (60).
4), (66), (67), (69), (71)
.

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

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

Constant speed control is performed in (Q3). The circuit (Ql) uses a pulse disk (304b) to control the rotation speed of the idle 0-ra (246).
A signal from a sensor (SE7) detected via the sensor and a speed signal from either the output terminal (circle) or (P2) are input. The terminal <Pl) outputs a speed signal for driving the bobbin (235), and the terminal <P2) outputs a speed signal for driving the bobbin (235).
0) is output. Each of these signals is converted into a voltage value within the circuit (Ql), and the circuit (Ql) is converted to a voltage value.
2). On the other hand, the circuit (Q3) outputs a reference waveform voltage for the pulse disk (304b) to maintain a constant rotation speed to the circuit (Q2). A suitable waveform voltage is formed by comparing the voltage values of , and is output to the motor (MS).Also, the moving speed of the belt (240) that can be driven by the motor (MS) is equal to the paper transport speed when storing paper. It is set slightly higher than that of , and set slightly lower when refeeding paper.

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

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

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

Jam flag: Displays that a jam has occurred within the copying machine main body (1) and within the paper refeed unit (100). C
In the control by the PU (80), step (512)
It is set when the occurrence of a jam is detected in the jam detection/processing subroutine executed in , and is reset when the jammed paper removal process is confirmed. In the control by the CPU (90), when the occurrence of a jam is detected, it is set [
See step (5384)], and can be reset when the jam processing is completed [see step (S392).

Jihemu A flag: When the power is turned on to the paper refeeding unit (100), the "Set in step (5234)" is displayed to indicate that there is paper left in the storage section (200) that the previous operator forgot to take out. , step (5392).

(5412)].

Jam B flag: Indicates that a jam has occurred during paper transport in the paper refeed unit <100) [Step (5374), <5376>, (537g), (
5381) and reset in step (5392)].

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

Single-sided mode flag 2 Instructs execution in single-sided copy mode [step <523>, set in (530), reset in step (S27)].

Double-sided mode flag: Instructs execution of first side copy in double-sided copy mode [set in step (S27), reset in steps (523) and (529>).

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

Overprint paper flag: Instructs to feed paper from the upper-stage printers 1 to (30) [set at step (S46), (5412), reset at step (545>, (5116)).

Underprint paper flag: Instructs to feed paper from lower cassette 1-(32) [set in step <545>, set in step (5)
46>, reset with (5116)].

Paper refeed flag: Displays that the copy process is for paper refed from paper refeed unit 1-(100) [Set in step (S116), 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), (5101) set, step (5
58).

(S64), reset at (596).

Determined Flag 2 Number of copies per original (number of copies) and storage unit (200) when duplex or composite copy mode is selected
Displays the completion of comparison with the number of sheets that can be accommodated (N) [Set in step (580), step (574), (
583)].

Copy operation permission flag 2 - Indicates that the operation is possible without any problems. In particular, the number of sheets that can be accommodated (N
) <Reset in the case of a set number to prohibit the copy operation [Set in step (S79), step (580)
So reset.

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

Paper feed wait signal: Displays that the paper storage WA is not ready in the paper refeeding unit h (100) and prohibits paper feeding operation [Sera! in step (S227)]・Reset in steps (S249) and (S255)].

Paper presence signal: Set when the number of sheets (number of copies) is stored in the storage section (200) [step (
5310) ], "Step (5308)" which is reset when all the sheets are ejected from the storage unit (200).
, (S363), (5412).

Preprocessing flag 2 Paper refeed unit <
100) to return to its initial position [Set in step (5223), reset in steps (S249) and (S255).

Standby flag: Displays that Bell 1-(240) has returned to its initial position [Step (5249).

Sera I at (5255), reset at step (5310)].

Drive request signal: Main morph (M
l) [Step (S227), (5
293).

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

Reset at (5310), (S329), and (5409).

Winding flag: Displays that the stun/bay mark (242) and overrun mark (241) are detected by the sensor (SE4) when returning the belt (240) to the initial position [steps (5246), ( S252
), set at (5254), step (5249),
(5255)].

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 region (Ll> of the belt (240) is located at the detection point of the sensor (SE4) [set in steps (5252) and (5254), reset in step (S255)].

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

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

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

Ejection flag: Operator stores paper in storage section (200)
Displays that the operation to discharge directly to the outside has been selected [set in step (5407>, step (541)
2) Reset.

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

When the CPU (80) is powered on, step (5)
1) will be reset and the random access memo J (R
AM), initialize registers, timers, counters, etc., and perform initial settings to put each device into the initial mode. Next, in step (52), the CPU (90
) etc., and when the end of the initial communication is confirmed in step (S3), an internal timer is started in step (S3). 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 '10', the subroutines of steps <S6) to (513) are sequentially called.

In step (S6), input of the number of copies (number of copies per original) set using the numeric keypad (64) is accepted. In step (S7), input of the copy mode (single-sided, double-sided, composite) set by the switch (73) is accepted. In step (S8), input of the paper size set by switch (69>) is accepted.Step (S9>)
Then, accept the clear/stop input from the switch (63>).In step (510), when duplex or composite copy mode is selected, the set number of sheets (number of copies) is transferred to the paper refeed unit (100). It is determined whether or not the copying machine can be accommodated, and it is determined whether or not the copying operation is permitted.In step (511), the copying operation under the selected copying conditions is processed.In step (512), the copying machine body Detecting the jam in step (1).Specifically, the jam timer set in step (511) is determined,
If the occurrence of a jam has not been detected, the print flag is set to 11, and then it is determined whether the jammed paper has been removed and the apparatus is reset to a copyable state. In step (513), C
Processes communication with PU (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 the copy mode setting subroutine executed in step (57) of the main routine of the CPU (80).

Here, first in step (521) the copy flag is set to "
After confirming that it has been reset to "0", in step (522) it is determined whether the paper refeeding unit 1-(100) is fully installed or not based on the on/off signal from the microswitch (MS). . If it is not attached, turn on the LED (74) in step (523), set the single-sided mode flag to 11'', and turn on the LED (75).
, (76) is turned off, the duplex mode flag and the composite mode flag are reset to 10'', and this subroutine is ended. On the other hand, if it is installed, step (52)
In step 4), it is determined whether or not the selection switch (73) is set to "Easy", and in step (525), it is determined whether or not the paper refeed flag is "0". If both are YES, that is, the copying machine body (1)
is not in the process of copying [YES in step (521)]
, the copy mode is switched by executing step (526) and subsequent steps every time the selection switch (73) is turned on, except when copy processing is transferred to the second side during double-sided copying and composite copying. The copy mode is initially set to one-sided copy mode,
After that, you can switch between double-sided, composite, and single-sided rotation.

That is, in step (526), the single-sided mode flag is set to 11.
”, and if it is set to “1”, turn off L E D (74) in step (527);
Turn on D (75) and set the single-sided mode flag to "
0" and set the duplex mode flag to 1.

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

When both the single-sided mode flag and the double-sided mode flag are reset to 10, L E is set in step (530).
D (76) is turned off, L E D (74) is turned on, the composite mode flag is reset to "0", and the single-sided moto flag is set to "71".

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

First, in step (541), it is determined whether the paper refeed flag is "0" or not. If it is reset to "0", step (541) is performed.
After confirming that the copy flag has been reset to "0" in step 542), it is determined in step S43 whether or not the selection switch (69) is on-edge. If it is on-edge, set the top paper or bottom paper feeding alternately. That is, if it is determined in step (544) that the overprint paper flag is "IJ," the overprint paper flag is reset to "0" and the bottom paper feed flag is set to "IJ" in step (545).On the other hand,
If it is determined in step (544) that the upper picture paper flag is 10, the lower paper feed flag is set to rO' in step (S46).
Reset 1 to 1 and set the -hi paper feed flag to "1". Thereafter, the size of paper stored in the paper feed section selected in step (548) is displayed on the LED group (70). Step (S42).

This step (S4
8) Process.

On the other hand, in step <541), the paper refeed flag is set to "1".
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 or not the empty signal is off-edge. If it is off-edge, that is, it is not the timing when paper has been replenished, then in step (550), it is determined whether there is no paper in the currently selected paper source. Determine whether or not. If there is paper, the empty signal is reset to "O" in step (551). On the other hand, if there is no paper, step (552)
It is determined whether the copy flag is "1" or not. If it is set to '1' (if the copying operation is in progress), the stop flag is set to '1' in step (553) to instruct the temporary stop of the subsequent copying operation, and step (S54)
The set number (the set number of copies) is stored in the RAM. Furthermore, in step (S55), the empty signal is changed to "
1”.

If it is determined in the step (S49) that the empty signal is on-edge, that is, if the paper is fully 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 (558), the stop flag is reset to "0" to enable restart of the copying operation.

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

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

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

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

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

11) When the print switch (61) is turned on after being turned on for the first time, the copying operation is restarted.

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

11> Paper is replenished in the paper feed section and the print switch (6
When 1) is turned on, the first side copy operation is restarted.

Therefore, in this subroutine, when it is confirmed in step (561) that the switch <63> is on, it is determined in step (562) whether the stop flag is rl. If set to '1', 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 "O" [No at step (562)], and when it is determined that the copy flag is "10" at step (565), the step <568> is processed. If the copy flag is set to rl, i.e.
If the copy operation is in progress, the stop flag is set to "1" in step (566), and the number of copies (number of copies) set at that time is stored in the RAM in step (S67).

FIG. 16 shows a subroutine for determining copy operation permission, 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 accept the number of sheets set when the duplex or composite lobby mode is selected.

When it is determined in step (571) that a copy operation is not in progress (copy flag is 10''), the following steps are processed. In step (S72), it is determined whether the single-sided mode flag is "0." In step (573), it is determined whether the paper refeed flag is "0." If the single-sided copy mode has been selected or if the paper has already been transferred to the re-feed copy operation, the determined flag is reset to "0" in step (574), and the process proceeds to step (S79).
) sets the copy operation permission flag to "rl".

On the other hand, if YES in both steps (S72) and (573), that is, the duplex or composite copy mode 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 0., step (576
) Calculate the length (L5) of the paper selected in the transport direction,
In step (577), the number of sheets (N) that can be stored in the storage unit (200) is calculated using the following formula.

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

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

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 (S75), it is determined in step (581,) whether the set number has been changed, and in step (582) it is determined whether the paper size has been changed. If either is YES, step (5)
83), the determined flag is reset to "0."

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

First, in step (591) it is determined whether the copy flag is "0" or not, and if it is reset to Jj, that is, if it is set off during the copy operation, then in step (592) is detected, step (
In step S93), the copy operation permission flag is set to "rl", and in step (594), the empty signal is set to "rl".
After confirming that each has been reset to 0,
In step (595), it is determined whether the stop flag is "1". If the stop flag is set to "1", the stop flag is reset to rO in step (S96), and in step (597) The original value stored in the numeric value is substituted, and the copy flag is set to "1" in step (598). Immediately after determining that the stop flag is "0" in step (595), step (59
8) Process.

Next, in step (599), it is determined whether the copy flag is "1" or not, and if it is reset to "0", the process immediately moves to step (5108). If it is set to "1", it is determined in step <5100> whether the paper feed prohibition signal is "11" or not. If it is set to "1", it means that a trouble has occurred in the paper refeeding unit (100), and in step (5101) the stop flag is set to "1", and in step (s+05) the current paper feed After the feeding of the paper inside is completed, the paper feeding operation is stopped. Also, step (5100
), if it is determined that the paper feed prohibition signal is rO, it is determined in step (5102) whether the stop flag is "1", and if it is set to "1", step (5105) is performed.
process. Next, when completion of paper feeding is confirmed in step (5106), the number of paper sheets fed up to now is substituted for the set number in step (5107), and the process moves to step (5108).

On the other hand, if it is determined in the step (5102) that the s)/tube flag is r In step (5104), a paper feeding operation from a predetermined cassette (30) or (32) is performed, and the process moves to step (5108). Paper feed wait signal is 11
”, 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 "1".
”, and if it is set in rlj, that is, if copy processing is in progress in one-sided copy mode, then in step (5110) it is determined 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 <5ill), and this subroutine ends.

If it is determined that the single-sided mode flag is "0" in step (5109), 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 "0" or not. Determine. If it is reset to "0", that is, when copying to the first side,
In step (5113), it is confirmed that the 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), the selected paper feed unit and its paper size are stored in the RAM. In step (5116), the second paper feed flag and the non-feed paper flag are set to "0".
, the paper refeed flag is set to "rl", and the copy flag and paper feed prohibition signal are reset to "rO", respectively, and this subroutine ends.

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

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

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

When the CPU (90) is powered on, step (52)
01), the random access memory (
Clears RAM), initializes registers, timers, counters, etc., and performs initial settings to put each device into initial mode. Next, in step (5202) the CPU
(80), and when the end of the initial communication is confirmed in step (5203), step (5204)
starts the internal timer. This internal timer has the same function as that of the main routine of the CPU (80).

Next, in step (5205), the jam flag is 10.
Determine whether or not. If it is set to "1", the process immediately moves to step (5209), and if it is reset to "0", each subroutine of steps (5206) to (5209) is called.

In step (5206), the operation of returning the belt (240) to the initial position is processed before the paper feeding operation is started in the copying machine main body (1). In step (5207), the operation of discharging the paper to the paper output tray (175) or the sorter (400> and the operation of storing it in the storage unit (200) are processed. In step (5208), the paper is processed from the storage unit (200) to the storage unit (200). The operation of refeeding sheets one by one is processed.In step (5209), a shift in the sheet refeeding unit (100) is detected and processed.

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

On the other hand, during processing in CPU (90), CPU (80)
When there is an interrupt request from C, in step (5211)
Processes communication with PtJ (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 rOyo, the process moves to step (5225), and if it is set to "1", step ( 5222), it is determined whether the paper presence signal is off-edge. If it is off-edge, the storage part (2
It is assumed that the paper refeeding operation from 00) has been completed, and the preprocessing flag is set to rl in step (S223), and the process moves to step (5225). If the paper presence signal drops at the off edge, the preprocessing flag is set to "
If it is set to ``1'', the process moves to step (5205), and if it is reset to ``r□'', 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 wait signal to "1" and drive the motor (M3) in the belt rewinding direction. At the same time, reset the state counter used in the following step (5230) to "0" and set the timer A,). Start the rubble timer. Here, the bobbin (235) is rotationally driven in the direction of the arrow (m>), and the belt (240) is wound back onto the bobbin (235).
This will be explained using the subroutine 0) (see FIG. 20). The trouble timer is used to detect a trouble in which the belt (240) does not move within a predetermined time when the motor (M3) is driven.

Next, in step (5228), it is determined whether the winding flag is on-edge or not, and if it is on-edge, the belt (240
) standby mark (242) or overrun mark (241) was detected by the sensor (SE4),
In step (S229), the solenoid (SL4), (S
L5) is turned on, the motor (M3) is driven in the belt winding direction, and a trouble timer is started. As a result, the bobbin (230) is rotationally driven in the direction of the arrow (m), and the belt (240) is wound around the bobbin (230). Then, in step (5230), the belt (
240) is temporarily overrun to the initial position and then stopped.

Next, in step (5231), it is determined whether the paper refeed flag is "rl". If it is set to "1", then in step (5232) the paper is forcibly ejected from the storage unit (200) according to the operator's selection.

If the paper refeed flag has been reset to "0", it is determined in step (5233) whether the sensor (SE3) is turned on. If the sensor (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.
, (5229>) executes control to turn off the fully driven motor (M3).The values of timers A and B that can be used here are set under the following conditions.

Timer A > L2/V...
...■Timer A>Timer B>Ll/V...
...■■: Belt (240) movement speed L1 Ni - 2 on the pitch of the overrun mark (241) 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 completely driven in the belt rewinding direction, the sensor (S
When the first on-edge of F3) is detected, it is determined in step (S244) whether or not the winding flag is "0". If it is reset to "0", step (5245
), it is determined whether timer A has finished counting.

If the count is completed, the bell 1- (240) is activated by the sensor (SF) before the motor (M3) is driven in the rewinding direction.
It can be determined that the position facing the detection point 3) was on the downstream side in the rewinding direction from the standby mark (242) [within the area (L4>).In other words, the position facing the detection point of the sensor (SF
The point where the first on-edge is detected in step 3) can be determined to be the standby mark (242), and the point at which the first on-edge is detected can be determined as the standby mark (242)
6) Turn off the motor (M3) and set the winding flag to position A.
The flag is set to rl, and the state counter is reset to 0''.

=75 If timer A has not finished counting, the belt (2
40) facing the detection point of the sensor (SF3) can be determined to be downstream in the rewinding direction from the region (L2) or region (L2>), and timer B is started in step (S247).

Next, when it is determined in step (5244) that the winding flag is "1", in step (5248) it is confirmed that the position A flag is set to "1", and in step (5249) the motor is (M3) is turned off. This stops the rewinding operation of the belt (240). at the same time,
The winding flag and position A flag are reset to "rO", the standby flag is set to "1", and the state counter is reset to "0"'. Also, the solenoid (
SL4) and (SL5) are turned off, and the drive request signal, paper feed wait signal, and preprocessing flag are reset to "0".

After starting timer B in the step (S247), if the value of the state counter becomes "2", that is, if the second on-edge of the sensor (SF3) is detected,
After confirming that the winding flag is reset to "0" G in step (5250), step <5
In step 251), it is determined whether timer B has finished counting. If the count is finished, just press the sensor (SF3).
), and if the count is not completed, it can be determined that the position where the belt (240) was facing the detection point of the sensor (SF3>) was in the area (L2), and step (5252 ) off.

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

At the same time, the winding flag and position B flag are set to "1" and the state counter is reset to "0".

After determining that timer B has finished in step (5251), if the value of the state counter becomes 3'', that is, if the third on-edge of the sensor (SF3) is detected, step At (5253), it is determined whether the winding flag is "0" or not. If it has been reset to '0', the motor (M3) is turned off in step (5254), the winding flag and position B flag are set to '11', and the state counter is reset to II O+1. on the other hand,
If the winding flag is set to "rl", turn off the motor (M3) in step (5255) and turn off the solenoid (
SL4) and (SL5), reset the winding flag and position B flag to "O", and set the standby flag to "
1”. Furthermore, the state counter is reset to 0'', and the drive request signal, paper feed wait signal, and preprocessing flag are reset to 0''.

FIG. 21 shows a subroutine of 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 (S282), the paper refeed flag is "1", and in step (5284), whether the duplex mode flag is "1" or not. The following processing is performed according to the copy mode being processed at that time.

When copying one side [YES at step (5281)], when copying the second side in duplex or composite copy mode [step (5281)]
5282), the paper is discharged straight to the paper discharge tray (175) or the sorter (400) in step (5283). When copying the first side in double-sided copy mode [YES in step (5284)], step (
5285), the paper is directly conveyed to the storage unit (200), and in step (S287), the paper is stored in the storage unit (200).

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

Note that steps (5283), (5285), (5
The details of the control procedure in step 286) will be omitted.

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

First, in step (5291), it is determined whether the copy flag is rl, and if it is reset to '0', the process moves to step (5296), and if it is set to '1', the process goes to step (5292). When the on-edge of the main body ejection signal is confirmed, immediately when the leading edge of the copied paper reaches the ejection section of the copying machine main body (1), the drive request signal is set to "1" in step (5293). . Next, step (5)
294) confirms that the sensor (SF2) is on-edge = 79
= When the paper is fed into the paper refeeding unit (100), the paper is transferred directly from the switching claw (125) to the intermediate conveyance section (1
80) (during double-sided copy mode), or after being switched back and reversed by the ejection rollers (135) and (136), the sheet is transported to the intermediate transport section (180) (during composite copy mode), and then The leading edge of the paper is the sensor (SF
When the detection point 2) is reached, the solenoids (SL4) and (SL5) are turned on in step (5295), and the motor (
Start the timer C1 jam timer A that determines the drive start timing of M3). Now the guide roller (2
10) is rotated in the direction of the arrow (j>), and the motor (M3) is ready to drive the bobbin (230).

Next, when it is confirmed in step (5296) that the timer C has finished counting, in step (5297) the motor (
A trouble timer is started to confirm that the motor (M3) is being driven normally, the motor (M3) is driven in the winding direction, and the timer C is reset. Thereafter, if the off-edge of the sensor (SF2) is confirmed in step (5298), that is, the trailing edge of the paper is
When detected in step 2), in step (5299), a timer D that determines the off timing of the motor (M3) is started, the above-mentioned automatic timer A is reset, and a storage counter is incremented.

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

During processing here, the paper is transferred to the guide roller (210), pinch rollers (215), (216) and belt (240).
), the arrow (m) is guided by the scraper (22g>)
Together with the belt (240), the belt (240) is wound onto a bobbin (230) that rotates in the same direction. And step (5300)
When it is confirmed that the timer D has finished counting, the motor (M3) is turned off and the timer D is reset in step (5301). Further, in step (5302), it is determined whether the sensor (SF3) is on-edge or not. If it is on-edge, at that point the sensor (SF3)
) and detects the end mark (243) of the belt (240
) has been wound up to the terminal end, and step (53
At step 03), the paper feed stop signal is set to 11'' to prohibit further paper feeding operations.

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 is reset to "OJ", it is determined that the previous copy condition has been canceled, and in step (5307) it is determined whether the count value of the accommodation counter is "1" or more. If it is 1″ or more, step (531
0), and (5311), the accommodation counter is reset to "0" in step (5312). Count value is 0''
If so, immediately end this subroutine.

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 of paper has been stored in the bobbin (230>), so the solenoid (SL4) is activated in step (5310).
), (SL5) is turned off, the drive request signal is reset to "0", the paper presence signal is set to "11", and the standby flag is reset to "0". Furthermore, step (5
After confirming that the stop flag has been reset to r□J in step 311), the accommodation counter is reset to "O"' 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 the paper refeed flag is "11" or not, and if it is reset to "0", this subroutine is immediately terminated. If it is set to '1', it is determined in step (5322) whether the copy flag is on-edge, and if it is on-edge, it is determined in step (5323).
), the paper refeeding flag and the drive request flag are reset to "1. and the state counter is rO", and the process moves to step (S325). After that, step (S324)
After determining that the paper refeeding flag is "1" in step (5325), the process moves to step (5325). In step (5325), the current state of the state counter is checked, and the motor (M3) and clutch (CLI) are controlled according to the count value.
, (Cl3), etc.

In the initial stage when the current value of the state counter is reset to "O", it is determined in step (S326) whether the transport permission signal is "1" or not. If it is reset to "0", the process moves to step (5360) and "1.
If the stop flag is set to 10, it is determined in step (5327) whether the stop flag is 10. If the value is reset to 0, then re-feeding is prepared for the first time.In other words, the timer F that determines the paper interval for re-feeding in step (S328)
, and set the state counter to "1". If the stop flag is set to rl, in order to temporarily stop the paper refeeding operation, the copy flag, paper refeeding flag, and drive request flag are set to "0" in step (S329).
” and turn off the motor (M3).

When the count value of the state counter is "1", it is determined in step (5330) whether the transport permission signal is "1" or not, and if it is set to "1", step (5331) is performed.
) to continue counting the timer F, and step (5
332) drives the motor (M3) in the rewinding direction, turns off the clutch (CLI), turns on the clutch (Cl3), and uses a jam B timer to detect the occurrence of a jam in the paper refeeding section (320). and state counter “
2”. Now the registration roller (330)
, (331) are stopped, and the guide roller (210) is reversely driven in the direction of the arrow (j'), and the paper begins to be fed out from the bobbin (230).

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

When the count value of the state counter is "2", it is determined in step (5334) whether the transport permission signal is "1" or not, and if it is set to "rl", the timer F and jam timer are set in step (5335). Continue counting B,
In step (5336), the clutch (CLI) is turned off and the motor (M3) is allowed to continue driving in the rewinding direction.
The process moves to step (5339). Transport permission signal is r□
, the count of the timer F and jam timer B is temporarily stopped in step (5337), and the clutch (CLI) is turned on in step (5338) to stop the reverse rotation of the guide roller (210). Then, 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 sensor (SE3) detects the leading edge of the paper that has been completely fed out from the bobbin (230), step (5340) is performed. to reset the jam timer B and newly reset the jam timer C and registration roller (
330), a timer G for determining the paper loop amount immediately before (331) is started, and the state counter is set to "3".

When the current value of the state counter is "3", it is determined in step (5341) whether or not the transport permission signal is "1", and if it is set to "1", the step (S342) is performed.
) to continue counting the timer F, timer G1, and jam timer C, and in step (5343), the clutch (C
LI) is kept in the off state and the motor (M3) continues to be driven in the rewinding direction, and the process moves to step (5346).

If the conveyance permission signal is reset to "0", the count of the timer 1 timer G and jam timer C is temporarily stopped in step (5344), and the count of the timer 1 timer G and jam timer C is stopped in step (534).
5) Turn on the clutch (CLI) and turn on the motor (M3).
is turned off and the process moves to step (5346). Next, when it is confirmed in step (5346) that the timer G has finished counting, in step (S347) the clutch (CLI) is turned on, the motor (M3) is turned off, and the state counter is set to "4''. As a result, the operation of feeding out the paper from the bobbin (230) is temporarily stopped, and the leading edge of the paper comes into contact with the nip portion of the registration rollers (330) and (331), forming a slight loop.

When the current value of the state counter is "4", it is determined in step (5348) whether the transport permission signal is "1" or not, and if it is set to "1", step (5349) is performed.
), the count of the timer F1 and the jam timer C is continued and the process moves to step (5351), and if it is reset to "r□", the count of the timer F and jam timer C is temporarily stopped in step (5350). The process moves to step (5351). Next, step (5351)
When it is confirmed that the timer F has finished counting, the motor (M3) is restarted in the rewinding direction in step (S352), the clutch (CLI>, (Cl3) is 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 completely fed out from the paper refeeding section (320).

When the current value of the state counter is "5," it is determined in step (5353) whether the transport permission signal is "1" or not.
In step (5355), the jam timer C continues counting, and in step (5355), the motor (M3) is driven in the rewinding direction and the clutch (CLI>, (Cl3) is kept off), and the process moves to step (5358). If the conveyance permission signal is reset to 10'', step (S35
In step 6), the count of the jam timer C is temporarily stopped, and in step (5357), the motor (M3> is turned off,
Clutch<C1l), (Cl3) is turned on and the process moves to step (5358). Next, step (5358
), when the off-edge of the sensor (SE3) is confirmed, that is, when the trailing edge of the paper is detected by the sensor (SE3),
In step (5359), the jam timer C is reset and the state counter is reset to "0". With this, one sheet of paper has been re-fed from the storage section (200) to the re-feed path (40>) of the main body (1) of the copying machine.

Next, in step (5360), when the on-edge of the sensor (SE4> is confirmed), that is, the standby mark (242) of the belt (240) is detected by the sensor (SE4), and the belt (240) reaches the end. If it is determined that the paper has been rewound, timer G is started in step (5361).At this time, the paper to be re-fed is the final paper.Timer G is determined so that the trailing edge of the final paper is at least close to the registration roller (330). , (331) is set to the time until it comes out of the nip.Next, step (S36)
In step 2), it is determined whether or not the count of the timer G has ended, and if the count has not ended or the timer G is not operating, it is determined in step (5364) that the stop flag is off-edge, and the step If it is determined in step (5365) that the copy flag has been reset to "o", the paper refeed flag is reset to "0" in step (5366). On the other hand, in the step (S362), the timer G
When the end of counting is confirmed, step (5363)
Reset the paper presence signal to "o" with
Clara f (CLI), (Cl3) is completed, resets the paper refeeding flag to "0", resets timer G, and ends this subroutine.

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

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

First, in step (5371), it is determined whether or not the jam flag is "rO", 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 Oyo, step (S)
373), (5375), and (5377), it is determined whether or not each jam timer A, BC has finished counting. If it is confirmed that the count has ended, it is determined that a jam has occurred, and the process proceeds to step (S374).
).

(S376), (S378) Tesham B Fraquo r1”
and moves to step (5383). Also,
Step (S379) The trouble timer [Step (
5227).

(5229)], and if it is confirmed that the count has ended, the sensor (SE7) monitors the driven rotation of the idle roller (246) in step (S3so).
Determine whether or not there is a pulse input to. If there is no input, it is determined that the motor (H3) did not operate normally, the jam flag is set to "1" in step (5381), and the process moves to step (5383). On the other hand, if there is an input, the trouble timer is reset in step (S382), and this subroutine is ended.

In step (5383), the jam signal is sent to the CPU (80).
After making a call to , the jam flag is set to 11'' in step (5384). The jam signal is processed by the CPU (80) and displayed on the display section (65) of the operation panel (60). Then, in step (5385), it is determined whether the jam flag is "1" or not, and if it is set to "1", in step (5386), it is confirmed that the discharge flag is reset to "10", and then Step (5387)
Stop the operation of all drive systems in step (5388).
), a forced ejection subroutine for directly ejecting the paper from the storage unit (200) to the outside is processed. On the other hand, if it is determined in step (5385) that the jam flag has been reset to "rO", then in this case the jam flag is set to "11".
Since the drive system has been set completely, the operation of all drive systems is stopped in step (5389). Here, the operator opens the guide cover (201) and removes the jammed paper. The sensor (S) opens and closes the guide cover (201).
E5), and in step (5390) the sensor (
When the off-edge of SE5) is confirmed, it is determined that the jammed paper has been removed and the guide cover (201) has been closed,
The jam signal is reset in step (5391). Further, in step (S392), all jam flags and jam timers are reset, and this subroutine is ended.

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

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

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

The sensor (SE5) is turned off when the guide cover (201) is opened. Therefore, if the sensor (SE5) is not turned off, this subroutine ends. Switch (S
W) is operated by the operator, and when its on-edge is confirmed, the drive request signal is sent to rl in step (5407).
” and reset the copy permission signal to “O”. At the same time, the paper refeed flag is reset to "0.", the discharge flag is set to rl, and the motor <M3> is driven in the rewinding direction.

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

Next, in step (5408), it is determined whether the sensor (SE4) is on-edge, and if it is on-edge, that is,
When the standby mark (242) of the bell I- (240) is detected by the sensor (SE4), it is determined that the rewinding of the belt (240) is completed, and the drive request signal is reset to "rO" in step (5409). At the same time, the motor (M3
) off. Furthermore, after confirming that the discharge flag is set to "1" in step (5410), it is determined in step (5411) whether the sensor (SE5) is on-edge. The guide cover (201) is closed,
When the sensor (SE5) is on-edge, step (5)
412), set the copy permission signal to 11, reset the ejection flag and jam flag to 0, set the overprint paper flag to 1, and set the paper present signal and paper feed stop signal to 10. Reset and exit this subroutine.

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

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

NaXP>L2 ・
...■NaXP>NbXP>LL
--■P: Bell 1-(240
) movement distance L1 pinch of run mark (241) L2 standby mark (242) and overrun mark (24
1) Distance [hereinafter referred to as margin] As is clear from the explanation in 2 of ``Effects of the Invention'', according to the present invention, a plurality of marks with different patterns are attached to the belt, and the detection signal of the mark and the belt Since the belt position is determined by comparison with the moving distance signal, it is possible to accurately determine the belt position and accurately stop the belt at a predetermined position. If used for rewinding and stop control, the length of the belt can always be used effectively.

[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. 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 the other internal structure of the paper refeeding unit from the front frame side; FIG. Fig. 9 is a plan view of the paper storage belt, Fig. 10 is a plan view of the operation panel, and Fig. 1 is a plan view of the paper storage belt.
Figure 1 is a block diagram of the control circuit, Figures 12, 13, 14a, 14blK, 15, 16, and 17.
Figure a, Section 17b, Figure 18, Figure 19, Figure 20, Figure 21, Figure 22a, Figure 22b, Figure 23a, Figure 23
FIG. b, FIG. 23c, FIG. 24a, FIG. 24b, and FIG. 25 are flowcharts showing the control procedure, respectively. FIGS. 26 and 27 are flow charts 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 Department, (135,
(136)...Discharge roller, (180)...Intermediate conveyance section, 200)...Paper storage section, (210)...Guide roller, (230, (235)...Bobbin, (2
40)...Paper storage belt, (241)...Overrun mark, (242)...Standby mark, (
320)... Paper refeeding device, (SE4), (SE7)
...Pulse generation sensor. Figure 8 C~S? Figure 9

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, the belt includes: a plurality of position recognition marks in different patterns attached to the belt; means for detecting the position recognition mark; A reproducing apparatus characterized by comprising: means for detecting a moving distance of the belt; and means for comparing a detection signal from the mark detection means with a detection signal from the distance detection means to determine the position of the belt. Paper feed device.