JPS62175340A - Paper refeeder - Google Patents

Abstract

PURPOSE:To make any unnecessary trouble preventable before it happens, by selecting a selector device to the side of a paper discharge tray when detecting a paper jam of copying paper by a paper jam detecting device, while prohibiting any operation of a paper passing mode selecting device. CONSTITUTION:A central processing unit of a controlling device lights a light emitting element 92 when a duplex mode is selected, while a first selector claw 60 is situated in an upper step and a second selector claw 65 in a lower step respectively by each of solenoids 62 and 67, and copying paper out of a pair of paper discharge rollers 21 is reversed of both faces up or down by a turnover roller 76 by way of a guide plate 75 by rollers 71-74, then housed in a paper refeed cassette 50. At this time, if a sensor Se2 detects a rear end of the copying paper, it starts a timer, and in case a sensor Se3 is left turned on intact even if its time limit elapses, it is detected as the paper jam caused by what the copying paper is wound on a turnover roller 76, whereby the first selector claw 60 is selected to the lower step by the solenoid 62, and the succeeding copying paper is guided into a paper discharge tray 45, while any operation of a paper passing mode selecting device is prohibited, thus continuous occurrence in the paper jam is prevented in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a paper refeeding device, particularly a paper refeeding device that once receives copy paper ejected from the copying machine main body, and then refeeds the copy paper from the paper feeding section of the copying machine main body. This invention relates to a paper refeeding device that can handle paper.

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, an upper cassette is installed between the paper ejection section and the paper feed section. When copying to the front side, it is moved to the paper ejecting section to receive the copy paper, and when copying to the back side, it is moved to the paper feed section and the received copy paper is re-feeded. An apparatus is disclosed.

Furthermore, Japanese Patent Application Laid-Open No. 58-134659 discloses that, in a copying machine equipped with a straight path type paper passage, a sheet storage cassette having a sheet storage opening and a sheet feeding opening is connected to a sheet discharge section and a sheet feeding section. A paper refeeding device is disclosed that can be attached and detached by reversing the front and back sides.

However, in each of the above paper refeeding devices, since the upper paper feed cassette or the sheet storage cassette itself is moved from the paper ejection section to the paper feed section, it is necessary to separately provide a paper ejection tray in the paper ejection section when copying the back side. Each cassette is designed as a dedicated part of the copying machine body, and has the problem that it is impossible to install it as an option in existing copying machines that do not have a refeeding device.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to make it possible to re-feed paper with a simple operation without the need to install a separate paper ejection tray when re-feeding paper, and to make it possible to re-feed paper using an existing copying machine that does not take paper re-feeding into consideration. We provide a paper refeeding device that can be used as an option for the paper refeeding cassette, and is designed to prevent unnecessary trouble in the event that copy paper jams in the conveyance path to the paper refeed cassette. It's about doing.

In order to achieve an objective that is more than a means for solving the problem, the paper refeeding device according to the present invention includes: (a) a main body section attached to a paper ejection section of a copying machine main body; (b) the above-mentioned paper refeeding device; (c) a paper refeed cassette that is removable from the main body and also removable from the paper feed section of the main body of the copying machine; (d) from the main body of the copying machine; (e) a switching means for switching the path of the ejected copy paper between the paper output tray side and the paper refeeding cassette side; (f) a control means for operating the switching means in response to a signal from the paper passing mode selection means; (g) a control means installed in the conveyance path to the paper refeeding cassette; (h) when the paper jam detection means detects a copy paper jam, the switching means is switched to the paper output tray side, and the paper feeding mode selection means is switched to the paper output tray side; It is characterized by comprising a means for prohibiting the operation, and the following.

[First Embodiment, see FIGS. 1 to 17] In FIG.
It is removable from the paper ejection section (25) of 1).
First, the outline of the copying machine main body (1) will be explained.

The main body of the copying machine ([) is of a transfer type using a well-known optical system movement method.A photosensitive drum (2) that can be rotated counterclockwise is surrounded by a charging charger (3) and a magnetic plano type. developing device (4), transfer charger (5),
A reverse paper separation charger (6), a residual toner cleaning device (7), and a residual charge eraser lamp (8) are installed. The original placed on the original platen glass (9) is moved to the left in Figure 1 by the optical system (10) (lamp (1)).
1), a lens (12), a mirror, etc.], an image is formed and exposed on the surface of the photosensitive drum (2) immediately in front of the developing device (4).

The copy paper is delivered from the paper feed cassette (15) installed in the paper feed section (13), (14) to each paper feed roller (16), (17).
The sheets are selectively fed one by one by the rotation of the register rollers (18), and are conveyed to the transfer section in synchronization with the leading edge of the image on the photosensitive drum (2), where the toner images are transferred. After that, the copy paper is transferred from the conveyor belt (19) to the fixing device (
20), the toner image is fixed thereon, and the paper is discharged from the paper discharge section (25) by a pair of paper discharge rollers (21).

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)
), paper output tray (45), paper refeed cassette (5o),
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), and this claw part (31a)
, (31a) is attached to the paper ejection section (25) by inserting it into the hole (26X, see FIG. 1) formed in the paper ejection section (25) of the copying machine main body (1). This hole (26) is originally 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 paper output tray (45) is made of transparent resin material, and the main body (
31), and is adapted to receive the copied copy paper discharged from the copying machine main body (1).

As shown in FIG. 4, the paper refeed cassette (50) has a substantially box shape, and as shown in FIG. 2, it can be attached to the main body (31) by sliding from the front side. ing. This paper refeed cassette (50) basically has the same configuration as the paper feed cassette (15), and the bottom plate (51) is swingable in the vertical direction using the back plate (52) as a fulcrum. After being pulled out from the main body (3I), it can be attached to the paper feeding section (13) or (14) of the copy paper main body (1) to re-feed the stored copy paper. FIG. 3 shows the paper refeed cassette (50) installed in the paper feed section (14). 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 (Sel) 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 cassette (50), and a drive roller (71). and a driven roller (72), a second switching pawl (65), a driving roller (73), a driven roller (74), a 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), (45
A) 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 solenoids (62) and (67) shown in FIG. When the paper passing mode is the paper output tray mode, as shown in FIG. 6(A), the first switching claw (6
0) is located at the lower stage, and the copy paper ejected from the paper ejection roller pair (21) of the copying machine main body (1) is guided by the upper surface of the switching claw (60) and sent onto the paper ejection 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, the copy paper is guided by the lower surface of the third switching claw (60) and the guide plate (70),
72).

(7B) and (74), and the top surface of the second switching claw (65), the guide plate (75), and the bottom surface portions (45a) and (45b) of the paper output tray (45). ), and further guided by the guide plate (78), the copying surface is reversed downward (face down) by the reversing roller (76) and the driven roller (77), and then the paper re-feeding cassette (5
0) is sent from the right inside.

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 plate ( 70), is conveyed by rollers (71) and (72), and is guided by the lower surface of the second switching pawl (65) to keep the copy surface facing upward (face up). The paper is fed into the paper feed cassette (50) from the left.

Therefore, the copy paper stacked in the re-feed cassette (50) face-down and face-up in this way can be removed from the main body (31) of the copying machine by pulling out the re-feed cassette (50) from the main body (31). ), the paper is re-fed and double-sided copies or composite copies are made.

Also, each paper feeding mode and each solenoid (62), (67)
Regarding the on/off relationship, in the paper discharge tray mode, the solenoids (62) and (67) are in the off state, and the switching claws (60) and (65) are both located at the lower stage. 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) is also located at the upper stage.

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

On the other hand, in the conveyance path, a copy paper detection sensor (Se2) whose actuator protrudes 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 (Se2) detects copy paper ejected to the main paper refeeding device (30) in any paper feeding mode, operates a counter to count the number of ejected paper sheets, and detects the leading edge of the copy paper. At the motor (7
9), and after a certain period of time has elapsed since the timer is activated upon detecting the trailing edge of the copy paper, that is, after the time has elapsed for the copy paper to be completely stored in the paper refeed cassette (50), the motor (79) is activated.
It is designed to stop the operation of the Sensor (Se3
) is for detecting copy paper jams that wrap around the reversing roller (76) or slip off.

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.

On the other hand, an operation panel (90) shown in FIG. 8 is installed on the main body (31), and includes a key (91) for selecting duplex mode, a 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) are in the released state, the mode is automatically switched to the paper output tray mode.

Figure 9 shows the input/output boat of the microcomputer (CPtl), and the input boat includes each sensor (Sel).
~(Se3), on/off signals from keys (91), (93) are input, and motors (79),
Solenoids (62), (67), light emitting elements (92), (
94) on.

An off signal is output.

Hereinafter, the control procedure in this embodiment will be explained with reference to the flowcharts of FIGS. 1O to 17.

FIG. 10 shows the main control routine. When the power is turned on and the microcomputer (CPU) is reset and started, each parameter is initialized in step (Sl). In step (S2), an internal timer is started. This internal timer is used for the step (SL
), which determines the processing time of one routine of this main routine, and each timer described in the following subroutines determines the end of the set time based on the count number of this internal timer for each routine.

Next, each subroutine of each step (S3) to (SIO) is called in sequence, and when the processing of all the subroutines is completed, the process waits for the internal timer to end in step (Sll) 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 or composite mode is selected, and step (S6) is a subroutine for processing when the paper refeed cassette (50) is pulled out from the main body (31). A subroutine, step (S7) is a subroutine when a jam (paper jam) is detected, step (S8) is a switching claw (80),
(65) Subroutine for switching step (S
9) is a subroutine when the paper refeed cassette (50) is full of copy sheets, and step (SIO) is a subroutine for performing other processing.

Here, various flags used in the following subroutines will be explained.

Over flag: When the number of copy sheets fed into the paper refeed cassette (50) exceeds 50, it is set to "1", indicating that the loaded capacity is almost full.

Two jam flags When the occurrence of a paper jam is detected in the paper refeeding device (30), this flag is set to rlJ and indicates the occurrence of a paper jam.

Jam switching flag: Set to "l" when a paper jam occurs, and instructs to stop driving the motor (79).

Switching flag 2 Paper jam occurs, paper refeed cassette (50)
When the loaded amount reaches a certain value, rlJ is set and instructs to switch the paper passing mode to the paper discharge tray mode.

By the way, FIG. 11 shows a subroutine for turning on the power. When the power is turned on in step (S20), step (S20) is shown.
In steps 321) 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. 12 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,
The determination in this step (S30) is NO, 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 (832). 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 (Se2) 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 (838) ), the copy paper length detection timer determines whether the copy paper length is 210 mm. Since this paper refeeding cassette (50) is only for A4 size horizontal feeding, check whether the copy paper ejected from the copying machine main body (1) is A4 size horizontal feeding or not.
Judgment is made based on the m standard. If the A4 size is not being fed horizontally, the determination in step (83g) is No, and the switching flag is set to "l" in step (S39).

If it is A4 size paper horizontal feed, it is determined as YES in step (S38), and when the end of the auto-shut timer is confirmed in step (S40), the motor (7) is turned on in step (S41).
9) is turned off, and when the end of the auto clear timer is confirmed in step (S42), a switching flag is set to rlJ in step (S43).

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 (Se2), the auto-shut timer ends, and step (
The motor (79) is turned off in S41). In addition, the switching flag is set to rN 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)). A subroutine instructs to switch to paper output tray mode.

Figure 13 shows the subroutine for 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 duplex 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,
In steps (S5:l) and (S54), the solenoid (62
), (67) are 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
el) 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 (Sel) is connected to the paper refeed cassette (5
0) is attached to the main body (31).

Next, in step (35g) it is determined whether the light emitting element (94) is on. This is to determine whether the combining 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 (860), and the step (S
61) to turn off the solenoid (67) and switch to duplex mode. If it is determined in step (S58) that the composition mode has already been selected, in step (S62) it is confirmed that the sheet number counter is 0, and the copy paper is not placed in the re-feed cassette (50). Switch to duplex mode only if the paper is not being fed. That is, step (S6
In step 3), the light emitting element (92) is turned on, in step (S64), the light emitting element (94) is turned off, in step (S65), the solenoid (62) is turned on, and in step (S66), the solenoid (67) is turned off.

Further, the steps after step (S67) are a subroutine 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 (86g) whether or not the light emitting element (94) is on. Light emitting element (94)
If it has already been turned on, since this is the second key operation, the combination mode is canceled in step (S69); the light emitting element (94) is turned off, 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 (Sel)
is turned on, the over flag is set to "0" in step (S73),
After confirming that the jam flag is "10" 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, double-sided copying is not selected, the light emitting element (94) is turned on in step (376), and steps (S77) and (87)
At step 8), turn on the trenoids (62) and (67) and switch to the synthesis mode. On the other hand, even if the duplex mode has already been selected [YES in step (S75)],
79), when it is confirmed that the number of sheets counter is 0,
Switch to compositing mode. That is, the light emitting element (94) is turned on in step (S80), the light emitting element (92) is turned off in step (S81), and step (S82).

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

FIG. 14 shows a subroutine 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 (Sel) that detects the attachment and detachment of the paper re-feed cassette (5o) is determined, and it is determined that the sensor (Sel) is off-edge, that is, the paper re-feed cassette (5o) has been 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 (8139) described below. At the same time, the over flag is reset to "0" in step (S93), the jam flag is reset to rOJ in step (S94), and the jam switching flag is reset to "0" in step (S95).

Next, in step (S96) 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 (398), and the step (S
99).

(8100) turns off the solenoids (62) and (67). On the other hand, if the motor (79) is on, the switching flag is set to "!" in step (SIOI) and the process returns to the 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 occurs when the motor (79) is turned off and the mode is switched to the output tray mode while copy paper is being conveyed, the solenoids (62) and (67)
This is because there is a risk that the switching claws (60) and (65) will switch to the upper stage when the switch is turned off, thereby damaging the copy paper being conveyed. Therefore, in the latter case, the switching flag is set to rN
is set, and in the pawl switching subroutine described below, a request is made to operate the switching pawls (60) and (65) after the copy sheet has passed (switching to the paper discharge tray mode).

FIG. 15 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 (Se2) to the sensor (Se2) 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 (S113) that the sensor (Se3) is still on, the copy paper is moved to the reversing roller (76). Since a paper jam such as paper jam has occurred, the jam switching flag is set to "I" in step (S114), the switching flag is set to "l" in step (S115), and the paper jam is set to "l" in step (S116). Set the jam flag to [ll] and return to the main routine.

FIG. 16 shows a subroutine for switching the switching claws (60) and (65). First, step (S120)
It is determined whether the switching flag is rlJ or not. If switching is instructed, the determination is YES, and step (S121
), the off-edge of the copy paper detection sensor (Se2) is confirmed.
That is, when the trailing edge of the copy paper passes the sensor (Se2), the switching flag is reset to "0" in step (S122), and the light emitting element (9) is switched on in steps (Si20) and (S124).
2) and (94) are turned off, and step (S125
) and (S126) turn off the solenoids (62) and (67). The timing of this switching is such that the copy paper is detected by the sensor (S).
e2) 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 (S129).
) to turn off the motor (79).

FIG. 17 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 selected, it is determined in step (S132) 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 paper refeed cassette's stack Jit (ffi) is set to 70 sheets, and when it reaches 50 sheets, the light emitting elements (92) and (94) blink. ].Therefore, when it is determined in step (S134) that the loaded amount has reached 50 sheets, step (S136) is performed.
), when it is confirmed that the light emitting element (92) is turned on, that is, that the duplex mode is being selected, the light emitting element (92) is made to blink in step (S137).

If it is confirmed in step (S138) 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 rlJ is set in step (S133), and after the copy paper passes, the switching claw (60
), (65) (switching to paper output tray mode) is requested.

[Second embodiment, see FIG. 18] This second embodiment is basically the same as the first 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 has only up and down passages.

In addition, in FIG. 18, the drive system is illustrated in more detail than in the first embodiment, and the rotational force of the motor (79) is transmitted to the gear (101) via the belt (100). Furthermore, it is transmitted to the press roller (34) via the idle gear (102), and is transmitted to the drive roller (71) via the idle gear (103). Further, it is transmitted to the drive roller (73) via a belt (104).
The signal is transmitted to the reversing roller (76) via a belt (+05).

In addition, a static elimination brush (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. and a switching means which is detachably attached to the paper feed section of the copying machine main body, and which switches the path of copy paper discharged from the copy machine main body to the paper output tray side and the paper refeed cassette side, and the copy paper A paper passing mode selection means for selecting the transport path of the paper between the paper ejection tray side and the paper refeeding cassette side, and a control means for operating the switching means in response to a signal from the paper passing mode selection means. 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 ejection tray, and it can be easily installed as an option in an existing copying machine. Moreover, a copy paper jam detection means installed in the transport path to the paper refeed cassette, and when a copy paper jam is detected by the paper jam detection means, the switching means is switched to the paper output tray. Since the copy paper is switched to the side and a means for prohibiting the operation of the paper feeding mode selection means, when a paper jam occurs, the copy paper is automatically fed into the paper ejection tray and then fed into the paper refeeding cassette. Since the operation of the paper feeding mode selection means is prohibited from now on, it is possible to prevent unnecessary troubles such as continuous occurrence of paper jams.

[Brief explanation of drawings]

FIGS. 1 to 17 show a first sheet refeeding device according to the present invention.
Fig. 1 is a cross-sectional view of this paper refeeding device installed in a copying machine, Fig. 2 is a perspective view for explaining attachment and detachment of the paper refeeding cassette, and Fig. 3 is a paper refeeding device. 4 is a perspective view of the paper refeed cassette, FIG. 5 is a sectional view of the paper refeed cassette, and 6
The figure is a sectional view for explaining the switching of the conveyance path of the paper refeeding device, FIG. 7 is an explanatory diagram of the operation of the switching claw, FIG. 8 is a plan view of the operation panel, and FIG. 9 is a block diagram of the control circuit. 10 to 17 are flowcharts for explaining the control procedure. FIG. 18 is a sectional view of a second 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) ... Paper refeed cassette, (
60), (65)...Switching claw, (62). (67)...Solenoid, (70), (75), (7
g)... Guide plate, (71), (72), (73),
(74), (76), (77)...roller, (79)
...Motor, (91), (93)...Key, (92),
(94)...Light emitting element, (Set)...Paper refeed cassette detection sensor, (Se2)...Copy paper detection sensor,
(Se3)... Clogging detection sensor. Patent applicant: Representative of Minolta Camera Co., Ltd. Patent attorney: Aobai Ao and 2 others Figure 74
Figure 75 Figure 75 Figure 12 Figure 73 Figure 16 Figure 17

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 paper 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 discharged from the copying machine body to the paper ejection tray side and the paper refeeding cassette side; a paper passing mode selection means for selecting a conveyance path between a paper discharge tray side and a paper refeeding cassette side; a control means for operating the switching means in response to a signal from the paper passing mode selection means; and the paper refeeding means. a paper jam detection means for copy paper installed in a conveyance path to a cassette; when the paper jam detection means detects a paper jam for copy paper, the switching means is switched to the paper output tray side;
A paper refeeding device comprising: means for inhibiting operation of the paper feeding mode selection means.