JPS63310426A - Manual paper feeding device for copying machine - Google Patents

Abstract

PURPOSE:To improve an operating property and enable the manual feeding of a number of sheets by providing a pressure contact releasing means for releasing or keeping the pressure contact between a feeding means and sheets of copying paper being interlocked with a manual-feed port opening/closing means. CONSTITUTION:As a manual-feed port cover 71 is opened up, sheets of copying paper 90 on a push-up plate 32 are retracted from a paper feed roller 24 releasing the pressure against the paper feed roller 24. When sheets of manual-feed paper 91 are inserted, the detecting levers 80, 62 of a manual-feed paper detecting switch 73 and a copying paper detecting switch 28 are pushed up due to the passage of the sheets of manual-feed paper 91, detecting the sheets of manual-feed paper 91. Then, as the manual-feed port cover 71 is restored, a motor is driven and a push-up lever 22 further pushes up the end parts of the sheets of manual-feed paper 91 via the sheets of copying paper 90 bringing the end parts into pressure contact with the paper feed roller 24 and, further, pushing up the paper feed roller 24. Here, a push-up detecting switch 65 is turned on and the motor is stopped to bring about a paper feedable condition.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a manual paper feeding device for a copying machine.

(Prior Art) In recent years, various copying machines equipped with manual paper feed have been provided in order to make double-sided copying, composite copying, etc. possible with conventional simple copying machines without relying on high-performance copying machines. . This type of manual paper feed device includes one that is equipped with a dedicated paper feed roller and one that shares the paper feed roller of an automatic paper feed cassette.
Although the latter has a more complex structure, it is more cost-effective and is therefore increasingly being adopted.

An example of a manual paper feeding device that uses a common paper feeding roller is disclosed in Japanese Patent Application Laid-Open No. 171746/1983. In this device, a manual feed table whose tip presses against the paper feed roller from below in the open state is attached to the copier main body so that it can be opened and closed, and a lever shaft that rotates as the manual feed table opens and closes is attached to a lever shaft that controls the tip of the copy paper. A paper feed roller push-up lever that pushes up the paper feed roller, and a manual feed lever that rotates the lever shaft from the outside are provided.

To make a single copy by manual feeding, it is sufficient to place the manually fed sheets one by one on the manual feeding table in an open state and insert them under the paper feed roller, thereby allowing paper feeding. To make continuous copies of multiple sheets by manual feed, leave the manual feed table open, raise the manual feed lever to retract the paper feed roller upward from the surface of the manual feed table, and then feed multiple sheets of paper into the manual feed table. After inserting the paper into the paper until the leading end contacts the return lever, the manual feed lever is lowered to bring the paper feed roller into pressure contact with the paper. This makes it possible to continuously feed all the manual sheets inserted into the manual feed table.

(Problems to be Solved by the Invention) However, in the conventional manual paper feeding device, the operations are different between pitcher feeding and manual feeding of multiple sheets, and in particular, in the case of manual feeding of multiple sheets, it is necessary to operate the manual feeding lever, which is cumbersome. In addition, the number of sheets that can be inserted is limited by the gap between the paper feed roller and the manual feed table, and the manual feed table must be returned to its original position after manual paper feeding, resulting in problems such as poor operability. .

The present invention has been made in view of the above problems, and an object of the present invention is to provide a manual sheet feeding device for a copying machine that has good operability and can manually feed a large number of sheets.

(Means for Solving the Problem) In order to solve the problem of correction, the present invention provides a manual paper feeding device for a copying machine in which the feeding means is shared with the feeding means of another paper feeding device. A manual feed port opening/closing means for opening and closing the manual feed port into which the paper is inserted, and a nuclear feed port opening/closing means are operated in conjunction with the manual feed port opening/closing means to release the pressure contact between the feeding means and the copy paper in the open state, and to release the pressure contact in the closed state. The manual feed guide member guides the manual sheet inserted from the manual feed port between the press-released feeding means and the copy paper.

(Function) Therefore, when the manual paper is inserted from the manual feed port after the manual feed opening/closing means is opened and the pressure contact between the feeding means and the copy paper is released, the manual paper is guided by the manual feed guide member and connected to the feeding means. Located between copy sheets. Then, when the manual feed port opening/closing means is closed, the manual paper is pressed against the feeding means by pressure through the copy paper, and manual paper feeding becomes possible.

(Example) Next, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a copying machine equipped with a manual paper feeder according to the present invention, and first, its schematic configuration will be explained along with its copying operation.

While the photoreceptor drum (1) is rotating in the direction of arrow (a), a certain electric charge is applied to the surface of the photoreceptor drum (1) due to discharge from the charger (2).

Next, a scanner (4) with an exposure lamp of an optical system (3) is installed.
) illuminates the document placed on the document table glass (5) while scanning in the direction of the arrow (b), and the reflected light is reflected by the mirrors (6a), (6b), (6c), and the lens ( 7),
The surface of the photoreceptor drum (1) is exposed to light through the mirror (8) and an electrostatic latent image corresponding to the original image is formed.

This electrostatic latent image is visualized by being supplied with toner from a subsequent developing device (9), and a toner image that reproduces the original image is formed.

On the other hand, the copy paper (90) is fed by a manual paper feeder (to be described later).
70) or a paper feeding unit (20b)
The toner image is selectively supplied from a pair of timing rollers (10) and conveyed to a portion facing a transfer charger (11) at the same timing as the toner image on the photoreceptor drum (1), where the toner image is After being transferred onto copy paper (90) and further separated by a separation charger (12), it is carried between a pair of fixing rollers (14) by a conveyor belt (13), and
The toner image is fused and fixed onto the copy paper (90) and is discharged to the paper discharge section (15).

The surface of the photoreceptor drum (1) is cleaned by a cleaning device (16).
) to scrape off the residual toner on the surface, and further, the residual charge is erased by light irradiation from the eraser lamp (17) in preparation for the next development.

Next, the configurations of the paper feed sections (20a), (20b) and the manual paper feed device (70) will be described.

The paper feed units (2Q a) and (20b) each include a cassette (21), a push-up lever (22), and a push-up mechanism (23).
).

It consists of a paper feed roller (24), a forward rotation roller (25), a reverse rotation roller (2B), a return lever (27), and a copy paper detection switch (28).

As shown in FIG. 2, each cassette (21) is removably formed in a cassette holder (101) provided at two locations on the upper and lower sides of the main body (100) of the copying machine (the lower part is not shown). A push-up plate (32) is provided at the bottom of the tray (31) so that its rear end is engaged with a not-illustrated locking groove of the tray (31) so that it can be raised and lowered.

The push-up lever (22) has one end connected to the copying machine body (100).
The push-up shaft (33) is integrally connected to the push-up shaft (33) supported by the frame (103), and the other end is formed so as to be able to come into contact with the protrusion (34) on the lower surface of the push-up plate (32). As shown in FIG. 3, this push-up lever (22) is appropriately biased in the direction of arrow P by a segment gear (35) fixed to one end of its push-up shaft (33) or by a spring (not shown), so that the push-up lever (22) reaches a stopper. By locking on (36), push up temporary (3
2) is released, and the segment gear (35) is rotated in the opposite direction to the arrow P by the push-up mechanism (23), which will be described later, so that the push-up plate (32) is pressed and pushed up. It has become.

As shown in FIGS. 3 and 4, the push-up mechanism (23)
A support shaft (3) is attached to the frame (103) of the copying machine body (100).
7), a plywood (39) which is rotatable around the stopper (38) and is biased in the direction of arrow Q and is locked to the stopper (38); a motor (40) fixed to the plywood (39); Base plate (
It is attached coaxially with the spindle (37) of the motor (39).
A first reduction gear (42) that meshes with a worm (41) attached to the transmission shaft of 40), and a first reduction gear (42) that is attached to the base plate (39) and meshes with the first reduction gear (42) and the segment gear (35). and a second reduction gear (43).

As shown in FIGS. 2 and 4, the paper feed roller (24)
A paper feed roller shaft (46) is attached to a paper feed roller holder (45) that is swingably attached to a drive shaft (44) that is rotatably supported on a frame (103) via a mounting frame (104).
It is supported by a shaft. The paper feed roller (24) is biased by a spring means (not shown), and the cassette (
21) A paper feed roller gear (47) that comes into contact with the copy paper (90) housed in the paper feed roller shaft (46) and is provided on the paper feed roller shaft (46).
is meshed with a drive gear (48) provided on the drive shaft (44) via an intermediate gear (49), and is rotated by a motor (not shown) connected to the drive shaft (44) to correctly move the copy paper (90). It is designed to be fed between a rolling roller (25) and a reversing roller (26).

In addition, the copy paper (90 sheets) housed in the cassette (21)
) is not pushed up by the push-up lever (22), the paper feed roller (24) descends due to its biasing force, and the push-up detection lever (described later) provided at the tip of the paper feed roller holder (45) is activated. 66) is the copying machine body (100
) is adapted to be engaged with a stopper (50) provided on the frame (103).

As shown in FIG. 4, the normal rotation roller (25) is supported by one end of the drive shaft (44).

As shown in FIGS. 2 and 4, the reversing roller (26)
A reversing roller holder (52) is fixed to a handling shaft (51) supported by a frame (103) of the copying machine main body (IQQ).
) is supported by a reversing roller shaft (53). As shown in FIG. 3, this reversing roller (26) is urged in the direction of arrow R in the figure by a spring means (not shown) and comes into pressure contact with the normal rotating roller (25), and the reversing roller shaft (53) ) is connected to the intermediate gear (4).
9) to rotate in the opposite direction to the normal rotation roller (25). Further, a response lever (54) fixed to one end of the handling shaft (51) is connected to a return lever shaft (54) which will be described later.
5) is pressed by the operating lever (58) and the handling shaft (5) is pressed.
1) rotates and the reverse rotation roller holder (52) swings, thereby making it possible to press against and release the press from the normal rotation roller (25).

As shown in FIGS. 2 to 4, the return lever (27) is
One end of the return lever shaft (55) is fixed to the return lever shaft (55) supported by the frame (103) of the copying machine main body (100), and is biased in the direction of arrow S in FIG. 3 by a spring means (not shown). The claw (56) provided on the base plate (39)
By locking the protrusion (57) of the cassette (
21) with a diagonal upward force toward the front end of the copy paper (90) housed in
26) is located above the pressure contact portion.

Further, as shown in FIG. 3, an operating lever (58) is provided at one end of the return lever shaft (55) of the return lever (27), and the wind (56) is 57
), it faces the responsive lever (54) of the handling shaft (51). Note that the biasing force of the return lever (27) or the operating lever (58) in the S direction is the same as that of the reversing roller (26) or the response lever (54).
It is larger than the biasing force in the R direction of .

As shown in FIGS. 2 and 4, the copy paper detection switch (28) is connected to the frame (103) of the copying machine body (100).
The support shaft (60) of the lever holder (59) is rotatably provided on the
), the tip of which fits into a slit (61) provided in the push-up plate (32) of the cassette (21), and a magnet (59) provided at the tip of the lever holder (59). 63), and a reed switch (64) provided on the frame (103) so as to face the magnet (63). Then, push up the plate (3
2) If there is copy paper (90) on top, press the detection lever (62).
) does not fit into the slit (61), and the magnet (6
3) is separated from the reed switch (64) and the copy paper (
If the detection lever (62) does not have the slit (6
1) and rotates clockwise in FIG. 2, so that the magnet (63) approaches the reed switch (64).

The push-up mechanism (23) includes a push-up detection switch (65).
) is activated by turning it on or off. That is, as shown in FIGS. 2 and 4, the push-up detection switch (65) is connected to the detection lever (66) provided at the tip of the paper feed roller holder (45) and the frame of the copying machine body (100). (103), and the detection lever (66) is turned on and off by moving in and out of the detection recess of the photocoupler (67) as the position of the paper feed roller (24) changes. , to drive the motor (40).

Next, the manual paper feeding device (70) operates the paper feeding section (2Oa
) tray (31) of the cassette (21), push-up lever (22), push-up mechanism (23), and paper feed roller (24)
In addition to the above, it also includes a manual feed cover (71), a manual feed guide member (72), and a manual paper detection switch (73).

As shown in FIG. 2, the manual feed cover (71) has a manual feed port (105) above the cassette (21) installed in the cassette holder (101) that opens on the side of the copying machine main body (100). It covers the copying machine body (100)
Noah L, -m (103) is provided so as to be rotatable around a support shaft (74). In addition, this support shaft (74) has
As shown in FIG. 3, the plywood (
A cam (76) that engages with a protrusion (75) provided on the manual feeder cover (71) is provided so as to be rotatable together with the manual feeder cover (71). Then, when the manual feed location / (- (71) is released, the cam (76) pushes down the protrusion (75) of the base plate (39), and the plywood (39) is rotated around the spindle (37) as shown in the figure. Rotate counterclockwise to engage the second reduction gear (43) and the segment gear (35) and to engage the protrusion (57) and the return lever shaft (
55) are disengaged from the claws (56), respectively.

The manual feed guide member (72) moves the paper feed roller (24) from the lower end of the manual feed rocker cover (71) above the copy sheet (90) that is housed in the cassette (21) and pushed up by the push-up lever (22). ) is supported by the frame (103) of the copying machine main body (100), and the tip of the manual paper (91) inserted by opening the manual paper cover (71) is inserted into the paper feed roller (24). It is designed to lead downward.

As shown in FIGS. 2 and 4, the manual paper detection switch (73) is connected to the frame (103) of the copying machine main body (100).
) of the lever holder (77), which is rotatably provided on the support shaft (7
8) is provided at one end of the manual feed guide member (
A detection lever (80) that fits into a slit (79) formed at the front end of the lever holder (72), a magnet (81) provided at the tip of the lever holder (77), and a detection lever (81) provided on the frame (103) to face the magnet. reed switch (82
) and . Then, install the manual feed guide member (7
2), the detection lever (80) is pressed by the tip of the manual paper (91) and rotates counterclockwise in Fig. 2, and the magnet (81) moves the reed switch ( 82) and detects that the manual paper (91) has been inserted.

In the copying machine having the above configuration, first, the operation of the paper feeding section (20a) that does not use the manual paper feeding device (70) will be described.

In FIG. 2, the cassette (21) containing the copy paper (90) is placed in the cassette holder (1) of the copying machine main body (100).
01), a cassette detection switch (not shown) is turned on after a certain period of time, and the motor (40) shown in FIG. 3 is driven. Here, before the motor (40) is driven, the push-up plate (32) of the cassette (21) is not pushed up by the push-up lever (22), and the paper feed roller (24) is lowered. Therefore, the push-up detection switch (65) is in the off state.

As shown in FIG. 3, the first. Since the segment gear (35) rotates clockwise in the figure against the force via the second reduction gears (42) and (43), the push-up lever (22)
2) to feed the copy paper (90) into the paper feed roller (24).
), the paper feed roller (24) is further pushed up via the copy paper (90). At this time, the push-up detection switch (65) is shielded from light and turned on, and the motor (40) immediately stops to become ready to feed paper. Note that the copy paper detection switch (28) is connected to its detection lever (62).
is pushed up by the copy paper (90), so it is in the off state.

In this state, when the print switch is pressed and the drive shaft (44) rotates, the forward rotation roller (25) and reverse rotation roller (26) rotate.
and the paper feed roller (24) rotates to feed the copy paper (90).
is fed between the normal rotation roller (25) and the reverse rotation roller (26) by the paper feed roller (24), and as shown in FIG.
) and the transfer charger (11).

As the copy paper (90) decreases, the paper feed roller (24) descends and the push-up detection switch (65) passes through and turns off, the motor (40) is immediately driven and the push-up lever is activated as described above. (22) is the copy paper (90) and paper feed roller (
24) starts to be pushed up, and soon the push-up detection switch (
65) is turned on when light is blocked, the motor (40) stops. In this way, as the copy paper (90) decreases, the push-up detection switch (65) is turned on and off to control the copy paper (90).
The pushing-up operation 90) is repeated, and the copy paper is always pressed against the paper feed roller (24) with a constant force. Note that if the copy paper (90) runs out, the copy paper detection switch (28)
)'s detection lever (62) fits into the slit (61) of the push-up plate (32), the magnet (63) approaches the reed switch (64), and it is detected that the copy paper (90) is missing. , is displayed on an operation panel (not shown).

Next, the paper feed section (21) using the manual paper feed device (70)
The operation a) will be explained.

First, as shown in Fig. 5, when the manual feeder cover (71) is opened, the cam (
76) rotates clockwise in Figure 3 to push down the protrusion (75), and the plywood (39) rotates counterclockwise in the figure against the biasing force around the support shaft (37). .

At this time, the second reduction gear (43) and the segment gear (3
5) is disengaged, and the segment gear (35) rotates counterclockwise in the figure along with the push-up lever (22) due to its biasing force (in the direction of arrow P). The lifting plate (32) descends due to its own weight, and the lifting plate (32) descends due to its own weight.
2) The upper copy sheet (90) is retracted from the paper feed roller (24), and the pressure on the paper feed roller (24) is released. As a result, the paper feed roller (24) descends by itself and the push-up detection switch (65) is turned off, but the copy paper detection switch (28) is turned on, so the motor (40)
will not start and the push-up lever (22) will not operate.

Further, due to the rotation of the base plate (39) in the counterclockwise direction in FIG. The shaft (55) rotates clockwise in the figure due to its biasing force (in the direction of arrow S), and the operating lever (58) presses the response lever (54), so the separating shaft (51) is rotated by the biasing force. The reverse rotation roller (26) rotates counterclockwise in the figure, and the reverse rotation roller (26) retreats from the normal rotation roller (25), as shown by the two-dot chain line in FIG. At the same time, due to the rotation of the return lever shaft (55), the return lever (27) moves as shown by the two-dot chain line in FIG.
Since the copy paper (9) rotates clockwise, the copy paper (9) that was stuck between the forward rotation roller (25) and the reverse rotation roller (26)
0) is returned onto the rear push-up plate (32).

Subsequently, as shown in FIG. 5, when a large number of sheets of manual paper (91) are inserted into the manual paper feed slot (105), the manual paper (91) is guided below the paper feed roller (24) by the manual paper feed guide member (72). is guided by the cassette (
21) and stops when it comes into contact with the tray (31). Note that the tip of the manual paper (91) is attached to the cassette holder (101).
The guide plate (106) extended further may be brought into contact with the guide plate (106), or the
It may be brought into contact with the return lever (27) located at the position indicated by the dashed dotted line, or a tip regulating member that is interlocked with the manual feed locker (71) may be provided separately and brought into contact with this.

When the manual paper (91) is inserted, the detection levers (80) and (62) of the manual paper detection switch (73) and the copy paper detection switch (28) are activated to detect the manual paper (91).
The paper (91) is pushed up by the passage of the manual paper (91), and the manual paper (91) is detected. Next, when the manual feed lock cover (71) is returned to its original position, a detection switch (not shown) is turned on, the motor (40) is immediately driven, and the push-up lever (22) is moved to the copy paper (
90). Then, as shown in FIG. 6, the push-up lever (22) pushes up the leading end of the manual paper (91) through the copy paper (90) and pushes the paper feed roller (22) up.
), and further push up the paper feed roller (24). At this point, the push-up detection switch (65) is turned on, the motor (40) is stopped, and the sheet can be fed.

If you press the print switch in this state, the cassette (
Similar to the case of feeding the copy paper (90) in 21), the manual paper (91) is fed and a specified number of copies are made. Here, if the paper feed roller (24) descends as the number of manual paper sheets (91) decreases, the push-up detection switch (65) detects this and operates the push-up mechanism (23), as described above. The paper (91) is always pressed against the paper feed roller (24) with a constant pressure. Then, while the manual feed paper (91) remains, the manual feed copy mode is maintained, and when the print switch is pressed, copying by manual paper feed continues. At this point, insert the manual paper feeder (7
0) to the manual paper feeder (70) and paper feed roller (24).
) is not possible, but switching to another paper feed unit (21b) is permitted.

Furthermore, when the manual paper (91) runs out, the manual paper detection switch (73) is activated and a predetermined display is performed.
After a certain period of time, the manual copy mode is canceled and paper can be fed from the normal cassette (21). Therefore,
After copying by manual paper feeding is completed, unlike the conventional copying machine described above, the copying machine shifts to the cassette paper feeding state without performing any operation such as returning the manual feeding table to its original position.

In the multi-sheet manual feed, if the manual feed cover (71) is opened after feeding a predetermined number of sheets, the cam (
The plywood (39) rotates via the push-up lever (
22) descends, the reverse rotation roller (26) retreats from the forward rotation roller (25), and then the return lever (27)
Since the manually fed paper (91) being fed is returned, the remaining manually fed paper (91) can be easily pulled out.

Further, as shown in FIG. 5, the manual feed paper (91) can be fed as long as the size of the manual feed slot (105) or the dimension between the paper feed roller (24) and the pushed-down copy paper (90) allows. , it is possible to insert as many sheets as you like.

Next, in order to perform one-pitch paper feeding using this manual paper feeder (70), a large number of sheets of manual paper (91) are fed.
The operation can be performed in the same manner as in the case of (1), and the same operation enables one-pitch sheet feeding, so a description of the operation will be omitted.

In addition, in the above embodiment, the interlocking operation of the manual feeder cover (71) and the push-up lever (22) is
) by the cam (76) provided on the push-up lever (22).
The segment gear (35) that rotates the segment gear (35) and the second reduction gear (
43), but the invention is not limited to this.

Other mechanical means such as a link mechanism, or electrical means such as a solenoid or motor may also be used.

Further, in the above embodiment, the push-up lever (22) is pushed up by the motor (40), but it may be pushed by a spring or the like.

(Effects of the Invention) As is clear from the above description, according to the present invention, it is possible to insert sheets into the manual feed slot with the same operation whether it is a pitcher feed or manually feed a large number of sheets, and paper feeding is performed with the same operation. Moreover, after copying by manual paper feeding is completed, the machine shifts to the cassette paper feeding state without any operation, which has the effect of improving operability.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a copying machine equipped with a manual paper feeding device according to the present invention, FIG. 2 is an enlarged sectional view of the paper feeding section of the copying machine shown in FIG. 1, and FIG. 3 is shown in FIG. 1. A front view of the paper feed section as seen from the outside of the frame of the copying machine main body, FIG. 4 is a perspective view of the paper feed section shown in FIGS. 2 and 3, and FIGS. 5 and 6 are shown in FIG. 2. FIG. 6 is a cross-sectional view of the paper feed unit when the manual feed cover is opened and closed, respectively. 21...Cassette, 22...Push lever, 23.
... Push-up mechanism, 24... Paper feed roller (feeding means),
32... Push-up plate, 35... Segment gear, 39
. . . Base plate, 43 . . . Second reduction gear, 70 . . . Manual paper feed device, 71 . , 90... copy paper, 91... manual feed paper, 105
...Manual feed port.

Claims (1)

[Claims] (1) In a manual paper feeding device of a copying machine whose feeding means is shared with the feeding means of another paper feeding device, a manual feeding port opening/closing means for opening and closing the manual feeding port into which manual paper is inserted; Interlockingly, the opening/closing means releases the pressure contact between the feeding means and the copy paper in the open state and maintains the pressure contact in the closed state, and the pressure release means releases the pressure contact between the manual feed paper inserted from the manual feed port. A manual paper feeding device for a copying machine, comprising: a manual feeding guide member that guides the paper between a feeding means and copy paper;