JPS62175334A - Paper refeeder - Google Patents

Abstract

PURPOSE:To make copying paper automatically feedable to a paper discharge tray at the time of a paper refeed cassette not yet being attached, by installing a controlling device which selects a selector device to the paper discharge tray side when it detects a fact that the cassette still remains unattached to a copying machine body. CONSTITUTION:When solenoids 62 and 67 are connected to selector claws 60 and 65, etc., selecting a paper passing mode and a sensor se1 for detecting a paper refeed cassette detects the extraction of the cassette from a copying machine body, a controller CPU turns the solenoid 62 to ON, selecting the first selector claw 60 to an upper step, and it is automatically selected to a paper discharge tray mode. Thus, in case of unattachment of the cassette to the copying machine body, copying paper is automatically fed to a paper dis charge tray, so that such a drawback that it is fed to the inside of the refeed cassette is in no case entailed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a paper refeeding device, in particular, a paper refeeding device that once receives the copy paper ejected from the main body of the copying machine, and then feeds the copy paper again from the paper feeding section of the main body of the copying machine. The present invention relates to a paper refeeding device.

Prior Art and its Problems In general, in order to perform double-sided copying or composite copying in a copying machine, it is necessary to feed one sheet of copy paper twice, and various paper refeeding devices have been proposed for this purpose.

For example, in Japanese Patent Application Laid-open No. 56-95264, in order to enable double-sided copying with a simple operation, in a copying machine equipped with a U-turn type paper path, a two-stage cassette is connected to the 01 paper section and the paper feed section. It is now possible to move between copies, and when copying to the front side, it will avoid moving to the tape paper section and receive the copy paper once, and when copying to the back side, it will be moved to the paper feed section and the received copy paper will be re-fed. A refeeding device is disclosed.

Furthermore, Japanese Patent Application Laid-Open No. 58-134659 discloses that a notebook storage cassette with f notebook storage openings and a notebook feeding opening is discharged in a KJ cassette equipped with a straight path type paper passing path. A paper refeeding device is disclosed in which the paper feeding section and the paper feeding section are turned upside down and can be attached and detached.

However, in each paper refeeding device described in 11η, the upper paper feed cassette or the notebook storage capacity center itself is moved from the paper ejection section to the paper feed section, so it is necessary to provide a separate paper ejection tray in the paper ejection section when back side copying is performed. , and each cassette is designed as a dedicated seat in the main body of the copying machine, which solves the problem that it is impossible to install it as an obnoyon in an existing copying machine that does not have a paper refeeding device.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to make it possible to refeed paper with a simple operation without the need to install a separate paper ejection tray when refeeding paper, and to make it possible to refeed paper using existing copying machines that do not take paper refeeding into consideration. A paper refeeding device that can also be used as an option and prevents copy paper from being conveyed to the paper refeeding cassette when the paper refeeding cassette is not installed in the main body. It is about providing.

In order to achieve an objective that is more than just a means to solve the problem, the paper refeeding device according to the present invention includes: (a) a main body section that is attached to the paper ejection section of the main body of the +51 copying machine; (b) (C) a paper refeed cassette that is removable from the main body and removable from the paper feed section of the copying machine; (1) a copying machine main body; (e) a detection means for detecting attachment/detachment of the paper refeeding cassette to and from the main body; f) A control means for switching the switching means to the paper ejection tray side when the detection means detects that the paper refeed cassette is not attached to the main body.

Embodiment [First embodiment, see FIGS. 1 to 7] In FIG. 1, the paper refeeding device (30) according to the present invention
) is removable from the paper ejection section (25) of the copying machine.First, we will briefly explain the main body (1) of the copying machine.

(The manuscript body (1) is of a transfer type using a well-known optical system movement method, and a photoreceptor drum (2) that can be rotated counterclockwise is surrounded by a charger (3) and a magnetic brush. type developing device (4), transfer charger (5)
) (Photograph separation charger (6), residual toner cleaning device (7), residual charge eraser lamp (8)
is installed. The original placed on the original table glass (9) is moved to the left in Figure 1 by an optical system (10) (consisting of a lamp (11), a lens (12), a mirror, etc.)
An image is formed on the surface of the photosensitive drum (2) immediately in front of the developing device (4) and exposed to 'N light.

The copy paper is fed from the paper feed center (15) attached to the paper feed unit (+3), (14) to each paper feed roller (16), (17).
The sheets are selectively fed one by one by the rotation of , and conveyed to the transfer section by a pair of roller rollers (18) in time with the leading edge of the image on the photoreceptor drum (2), where the toner image is transferred. Thereafter, the copy paper is sent from the conveyor belt l-(+9) to the fixing device Mj (20), where the I/ner image is fixed.

This paper refeeding device (30) is for receiving the copy paper ejected from the paper ejecting section (25), and roughly speaking, the main body section (31)
), a paper output tray (45), a paper refeed cassette (50),
It is composed of copy paper path switching claws (60) and (65).

As shown in Fig. 2, the main body (31) has a protrusion (3) at the tip.
1a), (31a) G, and these claw parts (31a), (3
1a) is attached to the paper ejection section (25) by inserting it into a hole (see 26X in FIG. 1) formed in the paper ejection section (25) of the copying machine main body (1). This hole (26) is originally intended for mounting a paper discharge tray (not shown). The bottom of the main body (31) is inclined in consideration of the case where it is mounted on a sorter (not shown).

(The 416 paper tray (45) is made of transparent resin material and is installed on two sides of the main body (31).
1) It is designed to receive the copied paper ejected from the machine.

The refeeding power cent (50) is approximately e as shown in Figure 1.
Ir; no table'/'-h l =y 91a
1. -m, 1-1', 61. − Thick thick if+
(2+)1. It can be installed by sliding from the front side. This paper refeeding cassette (50) basically has the same configuration as the paper feeding cassette (15), and the bottom plate (51) has a back plate (52) as a fulcrum.
It can swing downward, and after being pulled out from the main body (31), the paper feed section (13) or (14) of the copy paper main body (1)
It is possible to re-feed the stored copy paper by attaching it to the machine.

Figure 3 shows this paper refeed cassette (50) in the paper feed section (14).
) is shown attached. Further, as shown in FIG. 4, the paper refeed cassette (50) has a guide plate (32) provided on the main body (31).

(33) The upper part can be slid freely, and the rear part is the main body part (31
), and on the front side, the leg piece (53) provided on the back side touches the protrusion (32) of the guide plate (32).
32a), positioning and removal are prevented. The back of the guide plate (32) has an inclined surface (32b) and a high step (32c), and when the paper refeed cassette (50) is pulled out in the direction of arrow (A), it does not fall off the high step (32c). It will be in a tilted state. This is because the back plate (52) is the copy paper edge press roller (34) on the front side, and the roller support plate (
This is to avoid contact with 35). moreover,
A sensor (Scl) for detecting attachment/detachment of the paper refeed cassette (50) is installed on the back side of the main body (31).

As shown in FIG. 1, the copy paper conveyance path includes a first switching claw (60), a guide plate (70) for guiding the copy paper to the paper refeed center (50), and a drive roller (71). ) and driven roller (72), second switching pawl (65), drive roller (73) and driven roller (74), guide plate (75),
It is composed of a reversing roller (76), a driven roller (77), and an arc-shaped guide plate (78) along the reversing roller (76).

In addition, the lower surface part (45a) of the paper ejection tray (45), (
45a) also has a function as a guide plate. The driving rollers (71), (73) and reversing roller (76) are rotated clockwise by a motor (79) provided in the main body (31), and the copy paper edge pressing roller (34) is also rotated. It is rotated clockwise by this motor (79).

The switching claws (60) and (65) can be switched between the solid line position and the dashed-dotted line position using an operating lever (80), which will be described below. When the paper passing mode is the paper output tray mode, as shown in FIG. 6(A), the first switching claw (60)
is located on the lower stage, and is connected to the paper ejection roller pair (2) of the copying machine main body (1).
The copy paper discharged from 1) is guided by the upper surface of the switching claw (60) and sent onto the paper discharge tray (45). In the case of the duplex mode, as shown in FIG. 6(B), the first switching claw (60) is switched to the upper stage, and the second switching claw (65) is located to the lower stage. Therefore, copy paper is the first
rollers (71), (72) and (73), (
74) to the right, and the second switching claw (
65), the guide plate (75) and the paper output tray (45)
The reversing roller (76) is guided by the lower surface parts (45a) and (45b) of the
).

The copy surface is reversed downward (face down) by the driven roller (77) and fed into the paper refeed cassette (50) from the right side.

In the composite mode, as shown in FIG. 6(C), the switching claws (60) and (65) are switched to the upper stage, and the copy paper is placed between the lower surface of the first switching claw (60) and the guide. It is guided by the plate (70), conveyed by the rollers (71) and (72), and guided by the lower surface of the second switching claw (65) with the copy side facing upward (face-up). , are fed into the paper refeed cassette (50) from the left.

Therefore, the copy paper stacked face-down and face-up in the re-feed cassette (50) can be removed by pulling out the re-feed cassette (50) from the main body (31) and transferring it to the main body (1) of the copying machine. ), the paper is re-fed and double-sided copying or composite copying is performed.

By the way, the copy paper discharged from the copying machine main body (1) has the copy side facing upward, and the operator cannot visually check the copy paper when it is conveyed past the first switching claw (60). can. In particular, even in the case of the duplex mode, since the paper ejection tray (45) is transparent, it is possible to visually observe the sheets being conveyed on the guide plate (75).

On the other hand, in the conveyance path, there is provided a cover sheet detection sensor (Se2) with an actuator or a protrusion on the guide plate (70);
A jam (paper jam) detection sensor (Se3) whose actuator protrudes from the guide plate (78) toward the reversing roller (76)
) are installed. The sensor (Sc2) detects copy paper ejected to the paper refeeding device (30) in any paper feeding mode, operates a counter to count the number of ejected sheets, and detects the leading edge of the copy paper. At the motor (7
9), and when the trailing edge of the copy paper is detected, the timer is turned on and after a certain period of time has elapsed, that is, the copy paper is re-feeded.
- After the time elapsed, the motor (79) is completely stored in (50).
) is designed to stop the operation. Sensor (Se
3) is for detecting copy paper wrapping around the reversing roller (76) or paper jam.

Further, a mylar plate (59) is installed in the main body (31) adjacent to the reversing roller (76). This mylar plate (59) is attached to the reversing roller (76) in the duplex mode.
This is to prevent the trailing edge of the copy paper fed into the paper re-feed cassette (50) from curling upward due to heat curl. Incidentally, upward curling of the leading edge of the copy paper due to heat curling is prevented by rotating the presser roller (34) in the clockwise direction.

Next, the operating means for the switching claws (60) and (65) will be explained with reference to FIG. 7.

First, the first switching claw (60) is rotatably supported on the support shaft (61), and the second switching claw (65) is supported on the support shaft (66).
It is rotatably fixed to an integral surface.

The operating lever (80) has a support shaft (
8I) and is rotatably mounted. Intermediate lever (82)
is rotatably supported at the rear end by a support shaft (83), and its upper and lower arcuate portions (82a) and (82b) are connected to the operating lever (83).
0) forms a circular arc centered on the support shaft (81), and the circular arc part (
82a), on which a pin (60a) fixed to the first switching pawl (60) abuts, and the arcuate portion (82b) has a notch that can be engaged with a pin (8Qa) fixed to the operating lever (80). (82C) and (82d) are formed. The link (84) has one end connected to the operating lever (80), and a guide hole (84a) formed at the other end with the second switching pawl (
The pin (85a) of the link (85) fixed to the support shaft (66) of the link (65) is loosely fitted.

In the paper output tray mode, the operating lever (80) is rotated to the position shown in FIG. 7(A), and the intermediate lever (80)
2), the lower surface of the tip is in contact with the pin (80a), and the first switching claw (60) is located at the lower stage (dotted chain line position in FIG. 1). Further, the pin (85a) of the link (85) is located at the left end of the guide hole (84a) of the link (84), and the second switching claw (65) is also located at the lower stage (solid line position in Figure 1). There is. In this case, the lower end of the operating lever (80) (
80b) is evacuated from the advance/retreat path of the paper refeed cassette (50), and it is possible to pull out the paper refeed cassette (50).

To switch to duplex mode, move the operating lever (8o) to the 7th position.
Rotate it to the vertical position shown in Figure (B). At this time, the pin (8C1a) of the operating lever (80) is in the middle 1? ! ? By engaging with the notch (82c) of the lever (82), the positioning mechanism (82) rotates slightly upward about the support shaft (83), and the circular arc portion (82a) The first switching pawl (6o) is engaged with the pin (60a) on the right end.
) rotates to the upper position (solid line position in Figure 1). At the same time, the link (84) also moves to the left, but the amount of movement is limited to the guide hole (
84a), and the second switching claw (65) remains located at the lower stage. Further, the lower end (8(lh)) of the operating lever (8o) enters the advancing/retreating path of the paper refeed cassette (50), and the attachment/detachment of the paper refeed cassette (50) is locked.

To switch to the composition mode, the operating lever (80) is further rotated to the position shown in FIG. 7(C). At this time,
The operating lever (80) has a pin (80a) that is connected to the intermediate lever (
82), the intermediate lever (82) remains in the same position as in Fig. 7(B), and the first switching pawl (60) also remains rotated to the upper stage. It is. At the same time, by moving the link (84) to the left, the link (85) rotates clockwise together with the spindle (66), and the second switching pawl (65) moves to the upper stage (at the point in Figure 1). Rotate to the chain line position). In addition, the operation lever (80
) remains in the advancing/retreating path of the paper refeed cassette (50), and the lower end (80b) of the paper refeed cassette (50)
I-J ratio is maintained.

In this way, in this embodiment, the present paper refeeding device (
The paper passing mode in step 30) can be switched. In duplex mode and composite mode, the control lever (
The lower end (80b) of the paper refeeding force center (50) enters the advancing/retreating path of the paper refeeding force center (50) and prevents its attachment/detachment. Therefore, after feeding the copy paper to the paper refeed cassette (50) in the duplex/combining mode, set the operating lever (80) to the paper output tray mode and move the paper refeed cassette (50) to the main body (
31).

In addition, a solenoid is connected to the operating lever (80), link (84), etc., and when the solenoid is turned on, the operating lever (80) is activated.
) is configured to forcefully return to the paper output tray mode, when a paper jam occurs, the mode is automatically switched to the paper output tray mode, and copies after the paper jam are placed on the paper output tray (45). can be sent. Furthermore, when the number of copy sheets detected by the sensor (Sc2) reaches the full capacity of the paper refeed cassette (50), the solenoid is turned on to prevent problems such as paper jams that may occur thereafter. It is also possible to prevent this from happening.

Alternatively, when a sensor (Sel) for detecting the paper refeed cassette (50) detects that the paper refeed cassette (50) is pulled out, the solenoid may be turned on to automatically switch to the paper discharge tray mode.

In addition, when using the solenoid, if the timing to turn on the solenoid is when the trailing edge of the copy paper has finished passing the first switching claw (60), then the switching claw (60) There is no risk of damaging the paper.

Further, when the copy paper reaches its full capacity, the fully loaded state may be displayed externally, and in this case, it is convenient for the user if a predetermined advance notice of the full capacity is displayed before the copy paper reaches its full capacity.

[Second Embodiment, See Figures 8 to 18] This second embodiment has basically the same configuration as the first embodiment. The difference is as shown in FIG. A solenoid (62) is used to switch the second switching claws (60) and (65).
, (67) and realized control by a microcomputer. Therefore, the following description will be made with reference to FIGS. 1 to 6.

Turn on each paper feeding mode and each solenoid (68) and (67).

In the output tray mode, the solenoid (
62) and (67) are in the off state, and the switching claw (60)
.

(65) are both located at the bottom. In the duplex mode, the solenoid (62) is turned on and the first switching pawl (60) is located at the upper stage. In the composite mode, the solenoid (67) is also turned on, and the second switching pawl (65)
It is located on the upper row.

On the other hand, an operation panel (90) shown in FIG. 9 is installed on the main body (31), and includes a key (old) for selecting duplex mode, a round key (93) for selecting composite mode,
Light emitting elements (92) and (94) are attached to indicate that each key (91) and (93) has been selected.

Each key (91), (93) is selected by the first on operation, and is selected by the second on operation or other keys (93), (
91) is canceled by the on operation. Each key (91), (
93) is in the released state, the mode is automatically switched to the paper output tray mode.

Figure 1O shows the input/output boat of the microcomputer (CPU), and the human-powered boat has the above-mentioned sensors (Scl).
~(Sc3), on/off signals from keys (91), (93) are manually operated, and motors (79),
Solenoid l” (62), (67), light emitting element (9
2), turned on (94).

An off signal is output.

The control procedure in this embodiment will be explained below with reference to the flowcharts of FIGS. 1I to 18.

FIG. 11 shows the main control routine. When the power is turned on and the microcomputer (CI'U) is reset and started, each parameter is initialized in step (Sl). In step (S2), an internal timer is started. This internal timer is
l), which determines the processing time for one routine in this main routine, and each timer explained in the subroutine below determines the end of j when set based on the count number for each routine of this internal timer. do.

Next, the subroutines of each step (S3) to (StO) are sequentially called, and when the processing of all the subroutines is completed, the process waits for the internal timer to end in step (S11) and returns to step (S2).

Note that step (S3) is a subroutine for processing when the power is turned on, and step (S4) is for turning on the motor (78).

A subroutine for controlling the off, step (S5) is a subroutine for processing when duplex mode and composite mode are selected, and step (Sc) is a subroutine for processing when the paper refeed cassette (50) is pulled out from the main body (3). The subroutine, step (S7) is a subroutine when a jam (paper jam) is detected, and step (S8) is the switching claw (60), (
65) subroutine for switching, step (S9
) is a subroutine for when the paper refeed cassette (50) is full of copy sheets, and step (Sto) is a subroutine for processing the cassette.

Here, we will explain the various flags used in the subroutines below.

Over flag: When the number of copies fed into the paper refeed cassette (5o) exceeds 50 sheets, it is set in rlJ and stacked 1i.
T! Indicates that ffl is almost full.

Jam flag: When the occurrence of a paper jam is detected in the present paper refeeding device (3o), it is set to "1" and indicates the occurrence of a paper jam.

Jam switching flag 1 is set to rlJ when a paper jam occurs and instructs to stop driving the motor (79).

Switching flag 1 Paper jam occurs, paper refeed cassette (50)
is set to 11'' when the loading amount of the tray reaches a certain value, and instructs to switch the paper passing mode to the paper discharge tray mode.

By the way, FIG. 12 shows a subroutine for turning on the power. When the power is turned on in step (S20), step (S20) is confirmed.
In steps S21) and (S22), the light emitting elements (92) and (94) are turned off, and in steps (S23) and (S24), the solenoids (62) and (67) are turned off, and the process returns to the main routine.

FIG. 13 shows the motor control routine. First, in step (S30), it is determined whether the light emitting element (92) or (94) is on. If output tray mode is selected,
It is determined No in this step (S30), and the motor (7
Since there is no need to drive 9), this subroutine ends immediately. If the duplex mode or composite mode is selected, it is determined as YES in this step (S30),
When the on-edge of the sensor (Se2) is confirmed in step (S31), that is, the leading edge of the copy paper is detected by the sensor (Se2), the motor (79) is turned on in step (S32). With this, each roller (71), (73), (76).

(34) starts rotating. At the same time, step (S33
) increments the number of sheets counter and returns to step (S3
4) Reset the auto clear timer and step (S
Step 35) starts the copy paper length detection timer.

Next, in step (S36), when the off-edge of the sensor (Sc2) is confirmed, that is, the trailing edge of the copy paper is detected by the sensor (Se2), an auto-shut timer is set in step (S37), and in step (33g ), the copy paper length detection timer determines whether the copy paper length is 210 mm. This paper refeeding force cent (5o) is only for A4 size horizontal feeding, so whether the copy paper ejected from the copying machine main body (1) is A4 size horizontal feeding or not is determined by its length 210m.
It is determined that the pregnancy is based on m. If the A4 size is not being fed horizontally, the determination in step (33g) is No, and the switching flag is set to "1" in step (S39).

If it is A4 size horizontal feed, select YES and 1 in step (S38).
11, and when the end of the auto clear timer is confirmed in step (S40), the motor (79) is turned off in step (S41), and when the end of the auto clear timer is confirmed in step (S42). , step (S43)
Set the switching flag to rN.

That is, the auto clear timer is set to be slightly longer than the set time of the copy paper length detection timer plus the copy paper transport interval time during continuous copying, and the auto shut timer is set to be slightly longer than the set time of the copy paper length detection timer plus the copy paper transport interval time during continuous copying. It is set slightly longer than . Therefore, when copy sheets are continuously conveyed during continuous copying, the copy sheet length detection timers are started one after another in step (S35), and the motor (79) is not turned off. Then, when one copy or the last copy of continuous copying passes the sensor (Sc2), the auto clear timer ends for the first time, and step (S
41), the motor (79) is turned off. In addition, the switching flag is set to "1" when non-standard size copy paper (other than A4 size horizontal feed) is fed in (step (338)), and when the auto clear timer ends (step (S42)).
is set, and instructs switching to the paper output tray mode in the subsequent subroutine.

Figure 14 shows the subroutine of double-sided/composite selection,
First, in step (S50), it is determined whether the key (91) is on-edge, that is, it is determined whether the key (91) for selecting the double-sided mode is pressed, and if it is pressed, step (S50) is performed.
51), it is determined whether the light emitting element (92) is on.

If the light emitting element (92) is on, duplex mode has already been selected, and since turning on the key (91) this time is the second key operation, processing to cancel the duplex mode is performed.

That is, in step (S52) the light emitting element (92) is turned off,
Solenoid (62) in steps (S53) and (S54)
, (67) is turned off.

On the other hand, if it is determined in step (S51) that the light emitting element (92) is off, then in step (S55) the sensor (S
et) is turned on, and the over flag is set to " in step (S56).
After confirming that the jam flag is "0" and that the jam flag is "0" in step (S57), the mode is switched to the duplex mode. As mentioned above, the sensor (Set) is connected to the paper refeed cassette (5
0) is attached to the main body (31).

Next, in step (858) it is determined whether the light emitting element (94) is on. This is to determine whether the synthesis mode has already been selected. If it has not been selected, the light emitting element (92) is turned on in step (S59), the solenoid (62) is turned on in step (S60), and the (S
61) to turn off the solenoid (67) and switch to duplex mode. If it is determined in step (358) that the composite mode has already been selected, in step (S62) it is confirmed that the sheet number counter is 0, that is, if there is still copy paper in the paper refeed cassette (50). Switch to duplex mode only if the paper is not being fed. That is, step (S63
) turns on the light emitting element (92), turns off the light emitting element (94) in step (S64), turns on the solenoid (62) in step (S65), and turns off the solenoid (67) in step (S66).

Further, the steps after step (S67) are subroutines for selecting a composition mode, and in step (S67), it is determined whether the key (93) for selecting a composition mode is on-edge,
If it is determined that the light emitting element (94) is on, it is determined in step (S6g) whether the light emitting element (94) is on. Light emitting element (94)
If has already been turned on, since this is the second key operation, the light emitting element (94) is turned off in step (S69) to cancel the composition mode, and step (S70) is performed.

In (S71), the solenoids (62) and (67) are turned off. If it is determined in the step (868) that the light emitting element (94) is off, the steps (S55) to (S5
7), in step (S72) the sensor (Set)
is turned on, and the over flag is set to 10 in step (S73).
After confirming that the jam flag is "0" in step (S74), it is determined in step (S75) whether or not the light emitting element (92) is on. If the light emitting element (92) is off, that is, if double-sided copying is not selected, the light emitting element (94) is turned on in step (S76), and steps (S77) and (S7
At step 8), turn on solenoids (62) and (6?) and switch to composite mode. On the other hand, even if the duplex mode has already been selected [YES in step (S75)],
When it is confirmed that the number of sheets counter is 0 in step 9), the mode is switched to the compositing mode. That is, the light emitting element (94) is turned on in step (S80), and the light emitting element (94) is turned on in step (S81).
92) and snap (S82).

In (S83), the solenoids (62) and (67) are turned on.

FIG. 15 shows a subroutine that is executed when the paper refeed cassette (50) is pulled out from the main body (31).

First, in step (S90), the off-edge of the sensor (Set) that detects the attachment and detachment of the paper refeed cassette (50) is determined, and it is determined that the paper refeed cassette (50) is pulled out from the main body (31). When it is confirmed that the number of sheets has been exceeded, the number counter is reset to "0" in step (S91), and the blinking of the light emitting elements (92) and (94) is stopped in step (S92). This step (S92) is inserted to cancel the blinking of the light emitting element (92) or (94) executed in steps (S137) and (S139) described below. At the same time, the over flag is reset to "0" in step (S93), the jam flag is reset to "10" in step (S94), and the jam switching flag is reset to "0" in step (S95).

Next, in step (396) it is determined whether the motor (79) is turned on. If the motor (79) is not turned on, the light emitting elements (92) and (94) are turned off in steps (S97) and (39g), and step (S99) is performed.

In (S100), the solenoids (62) and (67) are turned off. On the other hand, if the motor (79) is on, the switching flag is set to "1" in step (SIOI),
Return to main routine.

That is, the solenoids (62) and (67) are activated only when the motor (79) is turned off and copy paper is not being conveyed.
Turn off and switch to output tray mode. This is because when the motor (79) is turned off and the mode is switched to the output tray mode while copy paper is being transported, the switching claws (eo) and (65) are switched to the upper stage when the solenoids (62) and (67) are turned off. This is because there is a risk that the copy paper being transported may be damaged.

Therefore, in the latter case, the switching flag is set in rlJ, and the switching claws (60) and (65) are operated after the copy paper passes in the claw switching subroutine described below (in the paper output tray mode). The request is to switch to

FIG. 16 shows a subroutine for detecting a paper jam. Here, first, in step (SIIO), the sensor (S
e2) is confirmed to be on-edge, that is, the leading edge of the copy paper is located at the sensor (
When detected in Se2), a jam timer is started in step (Sill). This jam timer is activated when the copy paper moves from the sensor (Sc2) to the sensor (Se) installed at the reversing section.
3) is set to the time it takes to pass. Therefore, even if it is confirmed in step (S112) that the jam timer has ended, if it is determined in step (SiI2) that the sensor (Se3) is still on, the copy paper is moved to the reversing roller (76). Since a paper jam has occurred, such as a paper jam such as "No paper roll", the jam switching flag is set to "1" in step (S114), the switching flag is set to "1" in step (S115), and the paper jam is set to "1" in step (S114). ) to set the jam flag to "1" and return to the main routine.

FIG. 17 shows a subroutine for switching the switching claws (60) and (65). First, in step (S120), it is determined whether the switching flag is rlJ. If switching is instructed, it is determined as YIES, and step (3 to 21)
When the off-edge of the copy paper detection sensor (Se2) is confirmed at step (S122), when the trailing edge of the copy paper passes the sensor (Se2), the switching flag is reset to "0".
In steps (S123) and (S124), the light emitting element (92)
), (94) and step (S125).
, (8126) turns off the solenoids (62) and (67). The timing of this switching is determined when the copy paper is detected by the sensor (Se
2) is set while the copy paper is being conveyed after passing through.

Next, in step (S127), the jam switching flag is set to r.
It is determined whether or not lJ. YES if a paper jam has occurred
It is determined that the jam switching flag is reset to "0" in step (S12g), and the jam switching flag is reset to "0" in step (S12g).
) to turn off the motor (79).

FIG. 18 shows a subroutine for detecting the loading amount of the paper refeed cassette (50). First, step (S130).

In (S131), it is determined whether the light emitting elements (92) and (94) are on or not, that is, whether duplex mode or composite mode is selected. If not, the process returns to the main routine. If it has been selected, it is determined in step (Si32) whether the count value of the sheet number counter is greater than 70, and if it is smaller, it is similarly determined in step (S134) whether the count value is greater than 50. In this embodiment, the loading capacity of the paper refeed cassette is 70 sheets, and when it reaches 50 sheets close to that, a preliminary display indicating that i:4, Ia is near [light emitting elements (92), (94)] blinking]. Therefore, when it is determined in step (3134) that the loading capacity is 50 sheets, step (3134)
), when it is confirmed that the light emitting element (92) is on, that is, that the duplex mode is being selected, the light emitting element (92) is made to blink in step (S137).

Further, when it is confirmed in step (S13g) that the light emitting element (94) is on, that is, that the combination mode is being selected, this light emitting element (94) is made to blink in step (S139).

On the other hand, if it is determined in the step (S132) that the loaded amount has reached 70 sheets, the switching flag r I Jl is set in step (S133), and after the copy paper has passed, the switching claws (60) and (65) are set. request processing to operate (switching to paper output tray mode).

[Third Embodiment, Figure 19] This third embodiment is basically the same as the second embodiment, and the only difference is that the second switching claw (65) is omitted. It is said to be exclusive to the double-sided mode, which only hits up and down passages.

In addition, in FIG. 19, the drive system is illustrated in more detail than in the second embodiment, and the rotational force of the motor (79) is transmitted to the gear (101) via the belt (+00). is further transmitted to the presser roller (34) via the idle gear (102), and is further transmitted to the presser roller (34) via the idle gear (103).
The signal is transmitted to the drive roller (71) via the drive roller (71). Further, it is transmitted to the drive roller (73) via a belt (104), and to the reversing roller (76) via a belt (105).

In addition, a static elimination blank (10
6) is installed to remove static electricity that has accumulated on the copy paper.

Effects of the Invention As is clear from the above explanation, according to the present invention, a paper ejection tray is installed in the main body section attached to the paper ejection section of the copying machine main body, and a paper refeed cassette can be attached and detached. Moreover, it is detachable from the paper feed section of the copying machine main body, and is further provided with a switching means for switching the path of copy paper discharged from the copying machine main body to the paper discharge tray side and the paper refeed cassette side. Not only can the paper refeed cassette be used as a copy paper receiving means and a paper feeding means, but there is no need to provide a separate paper discharge tray, and it can be easily attached to an existing copying machine as an option. In addition, there is a detection means for detecting attachment/detachment of the paper refeed cassette to and from the main body, and when the detection means detects that the paper refeed cassette is not attached to the main body, the iη switching means is ejected. Since a control means for switching to the paper tray side is provided, if the paper refeed cassette is not installed in the main body, copy paper is automatically fed into the paper output tray and then fed into the paper refeed cassette. It never comes.

[Brief explanation of drawings]

1 to 7 show a first embodiment of the paper refeeding device according to the present invention, FIG. 1 is a cross-sectional view of the paper refeeding device installed in a copying machine, and FIG. A perspective view for explaining the attachment and detachment of the paper cassette, FIG. 3 is a sectional view of the paper refeed cassette installed in the paper feed section of the copying machine, FIG. 4 is a perspective view of the paper refeed cassette, and FIG. 5 6 is a sectional view of the paper refeeding cassette, FIG. 6 is a sectional view for explaining switching of the conveyance path of the paper refeeding device, and FIG. 7 is an explanatory diagram of the operation of the switching claw. Figures 8 through 18 show the second embodiment, Figure 8 is an explanatory diagram of the operation of the switching claw, Figure 9 is a plan view of the operation panel, Figure 10 is a block diagram of the control circuit, and Figures 11 through 18. FIG. 18 is a flowchart for explaining the control procedure. FIG. 19 is a sectional view of a third embodiment of the paper refeeding device installed in a copying machine. (1)... Copying machine main body, (25)... Paper ejection section, (3
0)... Paper refeeding device, (31)... Main body, (45)
...Paper output tray, (50)...14 paper feed cassette,
(60), (65)...Switching claw, (62). (67)...Solenoid, (70), (75,), (7
8)...Temporary guide, (71), (72), (73
), (74), (76), (77)...
Roller, (79)・Motor, (80)...Operation lever, (91), (93)...Key, (92), (94)
・・Light emitting element, (Set) ・・Paper refeed cassette detection sensor, (Se2) ・・Copy paper detection sensor, (Se3)
...Paper jam detection sensor. Patent Applicant Minolta Camera Co., Ltd. Agent Patent Attorney Aobai Ao and 2 others Figure 14 Figure 75 Figure 7b Figure 17 Figure 1E3

Claims (1)

[Scope of Claims] 1. A main body section attached to a paper ejection section of a copying machine main body; a paper ejection tray installed on the main body section; a refeeding cassette that is removably attachable to the paper feeding section of the copying machine; a switching means for switching the path of copy paper ejected from the copying machine body to the paper ejection tray side and the paper refeeding cassette side; a detection means for detecting attachment/detachment of a paper cassette to/from the main body; and control for switching the switching means to the paper ejection tray side when the detection means detects that the paper refeed cassette is not attached to the main body. A paper refeeding device characterized by comprising: means.