JPS59207339A - Paper feed device in copying machine or the like - Google Patents

Abstract

PURPOSE:To reduce the number of paper-feed rollers to only one and as well to eliminate failures, in a paper feed device for an electronic photo-copying machine, etc., by providing a manual insertion inlet attached with a recording paper detector in a coupling section between an inlet and a paper-feed path so that the paper-feed roller is rested in association with a signal from the detector. CONSTITUTION:When a recording paper (a) is inserted into a manual insertion inlet (gamma) from a manual insertion bed 47, a micro-switch MS1 is actuated, and a CPU which is not shown operates a rotary control member which is also not shown, under such a condition that a micro-switch MS2 detects the recording paper (a), to rotate a timing roller 45. At this time a solenoid which is not shown is deenergized so that a paper feed roller 18 rests. When the micro- switch MS2 detects the trailing end of the recording paper (a), the CPU returns the rotary control member which is not shown to its original position to release the manual insertion mode to retrieve the paper feed mode. With this arrangement the manual insertion can be made by only one paper feed roller with a simple structure, thereby failures can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device used in electrophotographic copying machines and the like.

Conventionally, as a paper feed device for an electrophotographic copying machine, the bottom plate of the recording paper cassette is flipped up toward the paper feed roller using a flip-up lever, and the recording paper fed out by the paper feed roller is placed in the paper feed path. A structure is known in which the recording paper is taken up by a roller and sent out by rotating a timing roller at an appropriate timing.

By the way, when adding a manual paper feeding function to such a paper feeding device, the recording paper in the recording paper cassette will not be sent out to the paper feeding path unless the bottom plate of the recording paper cassette is lifted up during manual paper feeding. It becomes possible to manually feed recording paper directly into the paper feed path. However, in the configuration of such a conventional paper feeding device with a manual paper feeding function, a separate paper feeding roller is rotationally driven for manual paper feeding, so a plurality of paper feeding devices are required.

The present invention does not use multiple paper feeding devices unlike the conventional paper feeding device with manual paper feeding function as described above, but uses a single paper feeding device that can feed general paper and manual paper feeding. so that you may be able to
Another object of the present invention is to provide a paper feeding device that can be used for a long period of time by reducing wear and tear on the sorting members and the like.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an electrophotographic copying machine embodying the present invention will be described in detail with reference to the drawings.

First, the entire electrophotographic copying machine to which the present invention is applied will be described with reference to FIGS. 1 and 2.

At the top of the copying machine body A, which has a pair of legs extending perpendicular to the plane of the paper in Fig. 2, is a document table 1 that can reciprocate in the left and right directions.
is positioned, and the image of the document placed on the document table 1 is copied through a condensing light transmitter (trade name: Cellhock lens) 2.
The image is projected onto the circumferential surface of the photosensitive drum 3 built into the body 8'A. Around the photosensitive drum 3, there are a charging electrode 4, a condensing light transmitting body 2, and a developing device 5, which are arranged adjacent to each other in the rotation direction thereof.
, a transfer electrode 6, a static elimination electrode 7, and a cleaning device 8 are arranged. Also, the recording paper a stored in the recording paper cassette B
The toner image is sent to the paper feeding path α by a paper feeding device whose details will be described later, is supplied to the heating roller fixing device 10 by the recording paper conveying device 9 located at the position of the transfer electrode 6, and is transferred from the photosensitive drum 3. After the image is fixed, the paper ejection roller device 1
1, the paper is taken out onto the paper discharge tray 12.

Directly below the copying machine body A, that is, between the legs 13A and 13B, a cassette holder 14, which constitutes a part of the paper feeding device, is incorporated. The cassette holder 14 can be pulled out to the front of the copying machine body A as shown in the first figure along the guide rails 16A and 16BVC that can slide along the grooves 15A and 15B of the legs 13A and 13B, and in this pulled out state. Then, the loaded recording paper (pressure plate) B can be replaced. A flip-up lever 19 is provided on the right side of the cassette holder 14 to flip up the bottom plate 17 of the recording paper cassette B toward a paper feed roller 18, which will be described later. This spring lever 19σ is fixed to the middle part of a spring shaft 20 extending in the front-rear direction on the right side of the cassette pedestal 14, and is controlled by an urging lever 21, which will be described later, at its rear end. The driven lever 22 is fixed.

3 and 4 show the main parts of the paper feeding device that feeds the recording paper a of the recording paper cassette B mentioned above, and the paper feeding device is located at the lower right corner of the copying machine body A facing the flip-up lever 19. It has a large diameter paper feed roller 18 located at. That is, this paper feed roller 18 is connected to the front and rear body frames 23A of the copying machine body A.
, 23B, and a plurality of auxiliary rollers 25 having an outer diameter approximately equal to that of the paper feed roller 18 are fixed at approximately the center of a paper feed roller shaft 24 that is rotatably wrapped around the paper feed roller shaft 23B. It is. An arcuate guide plate 28 is attached to the inner surface of the jam release door 27, which can be opened around a hinge shaft 26 shown in FIG. 28 and the paper feed roller 18, there is formed an intake path β for reversing and directing the recording paper a fed out from the paper feed roller 18 to the left in the horizontal direction.

A separating member 30 is attached to the jam release door 27 so that a separating rubber 29 at the tip can be brought into pressure contact with the circumferential surface of the paper feed roller 18 . The sorting member 3o is fixed to a rotatable sorting shaft 31 built in the front and back direction inside the jam release door 27, and the rear end of the sorting shaft 31 is driven by a bendable torque transmission spring 32. The lever 33 is the support.

Directly above the paper feed roller 18 described above, a rolling contact roller 35 is positioned which can be pressed against the circumferential surface of the paper feed roller 18 by the force of a compression spring 34. This rolling contact roller 35 is made up of vertically movable bearing blocks 36A, 36B pressed downward by a compression spring 34, as shown in FIG. The operating ends 40aK of the vertical movement levers 40A, 40B of the control shaft 39, which spans the fuselage frames 23A, 23B, are respectively engaged. The vertical movement lever 4
0A, 40B are front and rear fuselage frames 23A, 2
3B, the contact roller 35 is biased in the direction of arrow X by the strong biasing spring 41 that is stretched between Take the position shown by the imaginary line in Figure 3.

Returning to FIGS. 3 and 4, the paper feeding device includes a paper feeding path α that connects the front gripping passage β and the lower circumferential surface of the photosensitive drum 3. The paper feed path α, which is composed of a curved upper guide plate 42 and a lower guide plate 43, has the paper feed roller shaft 24.
A timing roller 45 provided on a timing roller shaft 44 extending between the front and rear fuselage frames 23A and 23B and a rolling contact roller 46 that rolls in contact with the timing roller shaft 44 are positioned parallel to the timing roller 45. Also,
A manual feed inlet γ is formed in the upper part of the jam release door 27, which joins the connection position of the intake path β and the paper feed path α, and the recording paper on the manual feed stand 47 fixed to the jam release door 27 is inserted into the same hand. It is taken into the machine through the inlet γ. Further, the manual feed entrance γ and paper feed path α are equipped with microswitches MSI and MS, which detect the insertion of manual feed recording paper and the recording paper that has entered the paper feed path.
2 are facing 1, and these microswitches MSl,
The output signal of MS2 is input to the control circuit CPU shown in FIG. The same control circuit CPUK also has a copy button CB.
A command signal is input, and the control circuit CPU sends an output signal to electromagnetic lunoids 5OLI and 5OL2, which will be described later.

The left side of FIG. 4 and FIG. 5 show a control mechanism for controlling the above-mentioned flip-up shaft 20, paper feed roller shaft 24, handling shaft 31, control shaft 39, and timing roller shaft 44, and a drive (not shown) is shown. Driving chino 4 driven by morph in the direction of arrow Y
8, the first one rotatably supported on the sprocket shaft 49 and the timing roller shaft 30. 2nd sprocket)'
50.

51. A first spring clutch 52 is located between the second sprocket 51 and the timing roller shaft 44.
The rotational motion of the first sprocket 50 is transmitted to the large-diameter drive gear 56 via an input gear 53 integral with the first sprocket 50 and a relay gear 55 of the intermediate shaft 54.

The drive gear 56 is supported by the paper feed roller shaft 24 so as to be freely rotatable as shown in the fourth diagram.
6 are provided with a second spring clutch 57 interposed between the paper feed roller shaft 24 and the paper feed roller shaft 24.
A third spring clutch 59 is provided between the control cam 58 and a control cam 58 rotatably supported thereon.

A support shaft 60 that communicates with the rear body frame 23A is provided approximately midway between the paper feed roller shaft 24 and the timing roller shaft 44, and the inner end of the support shaft 60 is operated by a first electromagnetic solenoid 5OL1. A control pawl 61 is rotatably supported, and a tip hook 61 of the control pawl 61 faces the control sleeve 57a of the second spring clutch 57.
It is set. Therefore, when the first electromagnetic solenoid 5OLI is excited by the output from the control circuit CPU, the rod 62
The control pawl 61 is rotated against the force of the spring 63 via the
The tip hook 61a is pulled away from the control sleeve 57a of the second spring clutch 57, and the feed roller shaft 24 is rotated. Further, a biasing lever 21 is provided at the outer end of the support shaft 60.
The proximal end of the biasing lever 21 is fitted so that it can rotate freely, and a biasing spring 64 made of a tension spring is hooked between the tip of the biasing lever 21 and the driven lever 33 of the cutting shaft 31.

On the other hand, below the support shaft 60 is a rear fuselage frame 23A.
A biasing spring 6 composed of a tension spring is provided between a driven lever 66 that can rotate around the fulcrum shaft 65 and the tip of the aforementioned biasing lever 2.
The distal end 68a of the operating lever 68, on which the lever 7 is engaged and can rotate integrally with the driven lever 66, faces the driven lever 22 of the spring upper shaft 20 which is in the set position as shown in FIG. .

The biasing lever 21 also has a driven roller 69 in its intermediate portion, which is driven by the control cam 58, which is made as a circumferential cam.

Sleeve 59 of the third spring clutch 59 mentioned above
Control cam 58 that can rotate in tandem with a
a, when the circumferential protrusion 58a and the driven roller 69 coincide, the biasing lever 21 is rotated clockwise in FIG. 5 about the support shaft 60, and the biasing springs 64 and 67 are tightened. , the bottom plate 17 of the recording paper presser) H is flipped up, and the sorting rubber 29 of the sorting member 30 is pressed against the circumferential surface of the paper feed roller 18 . Further, the biasing lever 21 has an actuation arm 70 branched from its intermediate portion, and the tip of the actuation arm 70 faces the driven end 40b of the vertically movable lever 40B. Therefore, when the biasing lever 21 is in the non-operating position shown in FIG. Contact roller 3
5 is confusing: When the peripheral protrusion 58a of the control cam 58 and the driven roller 69 coincide with each other when the control cam 58 is positioned away from the roller 18, the vertical movement lever 4OA, 40 moves into the operating arm 70.
EIti is rotated counterclockwise in Figure 5, and the rolling contact roller 3
5 is pressed against the circumferential surface of the paper feed roller 18 by the force of the compression spring 34.

Furthermore, a rotation control member 72 biased counterclockwise in FIG.
8 rotational movements are controlled by this rotation control member 72.

That is, the rotation control member 72 faces the driven end 72a facing the bell crank 73 operated by the second solenoid 5OL2 shown in FIG. 4 and the peripheral teeth of the sleeve 52a of the first spring clutch 52. Locking claw 72b
have. Therefore, the second electromagnetic solenoid 5OL
2 is excited, the locking pawl 72b is disengaged from the sleeve 52a of the first spring clutch 52, and the timing roller 45 rotates. Further, the rotation control member 72 has a pair of half-step tailwinds 72C and 72d facing above and below the sleeve 59a of the third spring clutch 59. That is, the half-step tailwind 72c can intervene in the interlocking locus of the pair of step protrusions 74a and 74b formed on the surface of the sleeve 59a at a distance of about 180 degrees, and the half-step tailwind 72C can intervene in the interlocking locus of the pair of step protrusions 74a and 74b formed on the surface of the sleeve 59a.
4a, approximately 180° located in a different plane from 74b
It is possible to intervene within the locus of movement of the pair of step protrusions 74c and 74d that are separated from each other. Therefore, the control cam 58 and the sleeve 59a rotate by 180 degrees for each reciprocating movement of the rotation control member 72, and return to the old positions of the control cam 58 and the sleeve 59atl'i by two reciprocations of the rotation control member 72.

Since the above-mentioned embodiment has the above-described configuration, paper feeding is performed by the following operation.

When the main switch of the electrophotographic copying machine is turned on, the driving chain 48 is driven by a driving motor (not shown).
It locks the sleeve 52a of the spring clutch 52, and also locks the advancing protrusion 74 of the third spring clutch 59.
Since aK is engaged, the biasing lever 21 maintains the position shown in the fifth figure. Therefore, in this state, the separating shaft 31 is in the inoperative position as shown in FIG. Further, since the actuating lever 68 is retracted below the driven lever 22 of the spring upper shaft 20 as shown in FIG. can be placed on the cassette holder 14 and set under the copying machine body A.

When the copy button CB is pressed, a copy signal is transmitted from the control circuit CPU, and the S2 electromagnetic lens 5OL2 is excited. For this reason, the rotation control member 72 is
Since it is rotated clockwise to the position shown in , there is a half-step tailwind 7.
2C is removed from the advancing protrusion 74a of the third spring clutch 59. Therefore, the sleeve 59a of the third spring clutch 59 and the control cam 58 rotate until they are stopped by the half-step tailwind 72d. As a result, the biasing lever 21 is rotated clockwise as shown in FIG.
4, 67 are drawn, and the cutting shaft 31 and the spring shaft 20
is biased counterclockwise in the figure. In this way, the bottom plate 17 of the recording paper presser) B is flipped up toward the paper feed roller 18, and the separating rubber 29 of the separating member 30 is pressed against the paper feed roller 18, thereby preparing for paper feeding. However,
At the same time, due to the clockwise rotation of the rotation control member 72 described above, the locking pawl 72b engages the first spring clutch 5.
Since it comes off from the second sleeve 52a, the rotation interlock is transmitted to the timing roller 45, and the timing roller 45 rotates. Therefore, unnecessary recording paper that has been accidentally placed in the paper feed path α due to a power outage or other accident is removed.

Next, when the microswitch MS2 detects that there is no recording paper a in the paper feed path α, the first electromagnetic solenoid 5OLI is energized by the output of the control circuit CPU, and the control claw 61 is activated by the control sleeve of the second spring clutch 57. 57
The recording paper a is removed from the paper feeding roller 18, and rotational force is transmitted to the paper feeding roller 18, and due to the rotational movement of the paper feeding roller 18 and the peeling action of the separating member 30, one recording paper a is taken out to the intake path β.

This recording paper a is sent to the paper feed path α by the rolling contact between the paper feed roller 18 and the rolling contact roller 35, but at the time when the recording paper a enters the paper feed path α, a signal is sent from the control circuit CPU. The second electromagnetic solenoid 5OL2 is demagnetized, and the rotation control member 7
2 moves back to the position shown in Fig. 8 (b). Therefore, the sleeve 52a of the first spring clutch 52 is stopped by the locking pawl 72b of the rotation control member 72, so the timing roller 45 is immediately stopped. At the same time, the third
Since the sleeve 59a of the spring clutch 59 is removed from the half-step mold 72d of the U rotation control member 72, the control cam 58 starts to rotate, but the biasing lever 21 control cam 58
8(a) until the circumferential protrusion 58a is completely removed.
Since the position of the recording paper aU in the middle of feeding is maintained, the paper feed path α
proceed inside.

Thereafter, by the continued rotation of the control cam 58, the handling shaft 31 is
And the biasing force of the spring upper shaft 20 disappears, and the sleeve 59a
The step protrusion 74b is the half-step mold 72c of the rotation control member 72.
The control cam 58 is stopped at the position shown in FIG. 8(b). On the other hand, the recording paper being fed advances through the paper feed path α due to the rotational movement of the paper feed row 18 which continues to rotate, and its leading end is stopped by the stationary timing roller 45, and the paper feed path α The sheet is bent in a loop shape inside the paper, and the microswitch MS2 senses the paper feeding ready state, and the control circuit CPU
With this output, the first electromagnetic solenoid 5OLI is demagnetized and the paper feed roller 18 is stopped, and the second electromagnetic solenoid 5OL2 is again energized at a predetermined timing.

In this re-energized state of the second electromagnetic solenoid 5OL2, the sleeve 52a of the first spring clutch 52 becomes free from the locking pawl 72b of the rotation control member 72, so the timing roller 45 rotates and enters the paper feed path α. A certain recording paper a is sent toward the photosensitive drum 3. In this case, the third
Since the advancing protrusion 74d of the sleeve 59ald of the spring clutch 59 is locked by the half-step mold 72d, the circumferential protrusion 58a of the control cam 58 is in the position shown in FIG. 8(c).
Since the biasing lever 21 is in an inoperative state, the spring north lever 19 and the separating member 30 also do not operate.

As described above, the recording paper a in the paper feed path α is fed 2,
When the rear end of the recording paper a is detected by the microswitch MS2, the command 1 of the control circuit CPU (therefore, the second electromagnetic solenoid 5QL2 is demagnetized, and each member returns to the state shown in FIG. 5. Of course, FIG. In the state, the sprung lever 19
Since it is in the inoperative position (U), the cassette holder 14 can be freely inserted and removed from the copying machine body, and the recording paper presser B can be replaced with the desired one.

Next, the case of manual paper feeding will be explained. In this case, one sheet of recording paper a on the manual feed table 47 is fed from the manual feed entrance γ to the paper feed path α.
be incorporated into. That is, when the recording paper a is sensed by the microswitch y-MS1 located at the manual feed population γ,
The second electromagnetic solenoid 5OL2 is energized at an appropriate timing on the condition that the control circuit CPUn-r intake switch MS2 detects the recording paper a. Therefore, the rotation control member 72 is in the position shown in FIG.
Since is not excited, the paper feed roller 18 does not rotate, and the recording paper a in the recording paper roller B is not taken out to the intake path β.

Thereafter, the control circuit CPU returns the rotation control member 72 to the position shown in FIG. 8(b) in response to the rear end detection signal of the manual recording paper a from the microswitch MS2, and once again swings the rotation control member 72 back and forth. to return to the state shown in Figure 5.

Note that during the above-described operation, the rolling contact roller 35 is brought into rolling contact with the paper feeding roller 18 only while the recording paper a is fed from the intake path β to the paper feeding path α. During paper feeding, the load of the contact roller 35 is not applied to the recording paper a, and therefore a "paper feeding error" in which the recording paper a is not fed by the timing roller 45 does not occur.

As is clear from the above description, according to the paper feeding device of the present invention, during manual paper feeding, the paper feeding roller 18 is kept in a non-rotating state, and the rotation control member 7 is controlled by the second electromagnetic lens 5OL2.
Since paper is fed simply by operating 2, there is no need for a dedicated paper feed for manual feed as in the past, and general paper feeding and manual paper feeding can be performed by simply installing one paper feed roller, so the mechanism is simple. It has the advantage that it is extremely simple, has fewer failures, and can be manufactured with a paper feeding structure that is inexpensive.

Further, since the sorting rubber 29 does not wear out prematurely due to the rotation of the paper feed roller 18, there is no need to maintain the paper feed device over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an electrophotographic copying machine according to the present invention, FIG. 2 is an overall sectional view of the same, FIG. 3 is an enlarged sectional view of the paper feeding device of the copying machine, and FIG. 4 is iV −iV in Figure 3
5 is an elevation view of the control mechanism section of the paper feeding device, and FIG. 6 is an exploded perspective view of the control section of the rolling contact roller.
Figure 7 is a block diagram of the paper feeding device, Figures 8 (a), (
B) and (C) are operation explanatory diagrams of the paper feeding device. B... Recording paper cassette, a... Recording paper, 19.
・・Kenage lever, 45・・Timing roller,
72... Rotation control member, 5OL2... Electromagnetic solenoid (actuator), MSI...
・Micro switch (detector), α...Paper feed path, β
...Intake passage, γ...Manual feed entrance.

Claims (1)

[Claims] 1) The recording paper in the recording paper cassette is flipped up toward the paper feeding member by the flip-up lever, and the movement of the paper feeding member passes the paper through the path formed across the conveyance path of the member, and the paper is fed into the paper feeding path. A paper feed device that feeds the paper to the positioned timing roller, and a detector that connects a manual feed inlet to a position where the passage and the paper feed path communicate and detect recording paper at the manual feed inlet are provided, The movement of the timing roller is controlled by a first actuator, the rotational movement of the timing roller and the posture of the flip-up lever are controlled by a rotation control member operated by a second actuator, and the detector detects whether the recording paper is A paper feeding device for a copying machine or the like, characterized in that, when detected, the first actuator is deactivated and only the second actuator is actuated.