JPS59167428A - Sheet transport apparatus of copying machine - Google Patents

Abstract

PURPOSE:To transport a sheet to the next copying process, with the leasing end of the sheet assuredly registered after a stopper is released by separating an upper roller from a lower roller after the sheet is brought into contact with the stopper to eliminate bending of the sheet. CONSTITUTION:After the posture of a sheet 48 is corrected while the leading end of the sheet 48 such as a copy sheet, a document or the like is brought into contact with a stopper 18 to be stopped, an upper roller 5 of a pair of rollers 5, 6 is separated and displaced upward from the sheet 48 and the lower roller 6 by rotating a ratchet wheel 40, a first cam 28 and a second cam 38 in direction of an arrow 50 by the rotating drive of a shaft 27 and turning a pivotal arm 24 on a pin 29, thereby eliminating bending of the sheet 48. Subsequently, after the sheet 48 stopped by the stopper 18 is released, the upper roller 5 is again brought into contact with the lower roller 6 by its dead load to clamp a sheet between both rollers 5, 6, so that the sheet 48 is transported to the next copying process, with the leading end thereof registered.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet 4 general feeding device for a copying machine for conveying sheets such as originals and copy paper in a copying machine.

As a prior art, there is a sheet conveying device having the following configuration.

A stopper is disposed on the exit side of the pair of transport rollers provided at the confluence of the original and copy paper transport paths to temporarily close the first general transport path and bring the leading edges of both sheets into alignment. Before the leading edge of the document transported by the pair of transport rollers disposed above and below the progressive path comes into contact with the stopper, the upper roller of the pair of rollers that transport the document is displaced away from the lower roller. . Thereafter, the leading edge of the original is brought into contact with the stopper by the weight of the original and the transport force of the lower roller, and the copy paper from the other transport path is also stopped by the stopper, which maintains this state. The tips of the lines match. After that, the ten rollers that transport the original move closer to the lower roller, and the stopper comes off the transport path.In this way, the original and copy paper are fused, and the paper is transported to the next copying process with their leading edges aligned. be done.

In such prior art, when the upper roller is displaced away from the lower roller, the frictional force between the document and the lower roller differs due to the difference in surface roughness and weight of the document, making it impossible to reliably transport the document and ensuring that the leading edge is It was difficult to match.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet conveyance device for a copying machine that solves the above-mentioned technical problem and conveys the sheet to the next copying process with the leading edges of the sheet reliably aligned.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention. The document conveyance path 2 of the diazo copying machine 1 is composed of an upper guide plate 3 and a lower guide plate 4. In this document conveyance path 2, a pair of upper and lower originals are conveyed while pinching the originals. conveyance roller 5,
6 is placed. The conveyance roller 5id is configured to be movable toward and away from the conveyance roller 6, which is a lower roller.

A document detection switch 9 having an actuating piece 8 protruding into the document conveying path 2 is provided on the downstream side of the conveying rollers 5 and 6 in the document conveying direction indicated by an arrow 7, and the document comes into contact with the actuating piece 8. As a result, the document detection switch 9 is activated 1111. A copy paper medium feed path 101 in which a copy paper feed path 10 having a photosensitive layer merges with the original document feed path 2 on the downstream side in the feed direction (right side in FIG. 1) of the detection switch 9
d: Consisting of an upper guide plate 63 and a lower guide plate 64.

Copy sheets 14 are stacked in a cassette 13 of the paper feed device 12 , and the copy sheets 14 are fed to the copy paper conveyance path 10 by a paper feed roller 15 .

At the confluence of the original transport path 2 and the copy paper transport path 10, there are a pair of transport rollers 16 for transporting the original and copy paper.
17 is arranged, and the lower roller of the conveyor rollers 16 and 17, the conveyor roller 17, is configured to be able to move toward and away from the conveyor roller 16, which is the -L roller. Near the confluence of the document transport path 2 and the copy paper transport path 10, there are a first sheet 60, a second sheet 61, which are made of, for example, synthetic resin and are flexible sheets. Third sheet 62
A stopper is provided on the downstream side in the conveyance direction of the confluence of the document conveyance path 2 and the copy paper conveyance path 10 to temporarily stop the conveyance of the document and the copy paper in order to bring their leading edges into alignment. 18 are provided. The original and copy paper, whose leading edges are aligned by a stopper 18 and overlapped, are guided to a printing device 20 by a guide plate 19.

FIG. 2 is a cross-sectional view showing the mechanical structure of the device for driving the embodiment shown in FIG. 1, and FIG. 3 is a horizontal cross-sectional view of FIG. 2. A plurality of conveyance rollers 5 are fixedly provided at equal intervals in the axial direction of the rotating shaft 21. Further, a loosely inserted roller 22 having an insertion hole 51 is loosely inserted into the rotating shaft 21 as a ten roller as shown in the fifth figure. For example, the loosely inserted roller 22 made of synthetic resin is the conveyor roller 5.
A plurality of them are provided at equal intervals in the axial direction (horizontal direction in FIG. 3). Loose insertion roller 22
In order to prevent a large displacement in the axial direction of the cylinder, a setter 23 such as an E-IJ ring is provided at a slight interval on both sides of the cylinder.

The rotating shaft 21 of the progressive roller 5 is pivotally supported at one end of a swinging arm 24 via a bearing 25.
4 is provided with a follower 26 projecting therefrom, and the follower 26 is driven by a first cam 28 fixed to the roller 127 of the paper feed roller 15. The other end of the swing arm 24 is pivotally supported by a frame 30 by a pin 29. A push-up member 32 is pivotally supported at both ends of the shaft 31 of the conveyance roller 17 . This presser member 32 has elongated holes 33 and 34 extending horizontally and vertically, respectively, and a pin 59 at one end of the swing arm 35 is fitted into the elongated holes 33. wT moving arm 35 is pin 3
6 for angular displacement. A follower 37 is provided protruding from the other end of the swing arm 35. This follower 37 is connected to the shaft 2
The second cam 38 is fixed to the second cam 7 . Paper feed roller 1
A pawl 41 can be engaged with and disengaged from a pawl type 40 of a spring clutch 39 provided at the end of the shaft 27 of 5. This nail 41
is formed at one end of an arm 43 that is pivotally supported by a pin 42, and the other end is pin-coupled to a movable piece 45 of a solenoid 44. When the solenoid 44 is not energized, the movable piece 45 is extended as shown in FIG. Accordingly, the power from the sprocket wheel 47 is not transmitted to the shaft 27 of the paper feed roller 15 by the action of the spring clutch 39. When the solenoid 44 is energized, the movable piece 45 retracts, so that the pawl IIT, 4 (l to the pawl 41 is disengaged, and the driving force from the sprocket wheel 47 and the spring clutch 39 are removed.
It is transmitted to the shaft 27 of the paper feed row 215 via.

The stopper 18 has a cutout corresponding to the transport roller 17 as shown by the imaginary line in FIG.
The end portions of the document 8 and the copy paper on the downstream side in the conveying direction are vertically bent, and when the document 48 and the copy paper come into contact with these vertical bends, the leading edges are aligned. The first sheet 60 has its peak end fixed to the end of the upper guide plate 3, and its free end extends downstream of the stopper 18 in the conveying direction. One end of the second sheet 61 is fixed to the end of the lower guide plate 4, and the free end of the second sheet 61 is fixed to the end of the lower guide plate 4.
0, it extends downstream of the stopper 18 in the conveyance direction. One end of the third sheet 62 is fixed to the end of the upper guide plate 63, and the free end comes into contact with the curved surface of the stopper 18.

The original 48 is conveyed between the first sheet 60 and the twenty-seventh sheet 61, and the copy paper is conveyed between the lower guide plate 64 and the third sheet 62. 1st. As shown in FIG. 6, the free end portions of the second sheets 60, 61 extend downstream in the conveying direction from the bent portion of the stopper 18, and are supported by a step formed in the bent portion of the stopper 18. 1st. Second. 3rd Sea) 60
, 61 and 62 are pushed toward one side from the bent portion of the stopper 18 by the conveyance roller 17 as shown in FIG. 2 (1) when the conveyance roller 17 is displaced upward from the notch of the stopper 18 It can be raised. As a result, the state in which the original and the copy paper are stopped by the stopper 18 is released.

FIG. 4 is an enlarged view of the first cam 2B and second cam 38 in FIG. 2(1). The first cam has a first cam surface A1 having a small diameter.
The second cam 38 has a second cam surface A2 having a medium diameter and a third cam surface A3 having a large diameter, and the second cam 38 has a first cam surface B1 having a large diameter and a second cam surface B2 having a small diameter. and has.

To describe the operation with reference to Figure 2 again, first, Figure 2 (1
), the solenoid 44 is not energized, so the pawl 41 remains engaged with the pawl mold 40, and the paper feed roller 15
The shaft 27 of the first cam 28 . does not rotate and accordingly the first cam 28 . 2nd cam 3
8 doesn't rotate either. The follower 26 of the swinging arm 24 has a first
The conveyance roller 5, which is the upper roller, and the loosely inserted roller 22 contact the first cam surface A1, which is the small diameter of the cam 28, and at this time, the upper roller, the conveyance roller 5, and the loose insertion roller 22,
It contacts the conveyance roller 6, which is a lower roller, and rotates due to the contact force. Furthermore, the follower 37 of the swinging arm 35 contacts the large-diameter first cam surface B1 of the second cam 38, and the transport roller 17 contacts the transport roller 16, and the contact force rotates the transport roller 17. .

At this time, when the document 48 is inserted as shown by the arrow 7, it is conveyed by the conveyance rollers 5 and 6.

When the leading edge of the document 48 being conveyed tilts the operating piece 8 of the document detection switch 9, the solenoid 44 is energized and the movable piece 45 is displaced in the direction of arrow 49, thereby causing the arm 43 to rotate around the pin 42. The engagement between the claw 41 and the claw mold 40 is released. Then, the rotational power from the sprocket wheel 47 in the direction of arrow 50 is transmitted to the shaft 27 of the paper feed roller 15 via the spring clutch 39. Also, when the operating piece 8 of the document detection switch 9 is tilted, the solenoid 44
A timer (not shown) is activated to demagnetize the signal.

Referring to FIG. 2(2), when ill+ 27 is rotated and moved, claw mold 40, first cam 28, and second cam 38, which are integral with it, rotate in the direction of arrow 50.

The follower 26 of the swing arm 24 comes into contact with the second cam surface A2, which is the middle diameter of the first cam 28, thereby causing the swing arm 2
4 rotates around the pin 29, the shaft 21 of the conveyance roller 5 is displaced, and the conveyance roller 5 is separated from the conveyance roller 6. At this time, the loosely inserted roller 22 that is loosely inserted into the shaft 21 comes into contact with the conveyance roller 6 under its own weight, as shown in FIG. 5(2). In other words, the document is conveyed while being pinched by its own weight. At the same time, the follower 37 of the swinging arm 35 comes into contact with the second cam surface B2, which is the small diameter of the second cam 38, so that the swinging arm 35
rotates around the pin 36, the lug 31 of the conveyance roller 17 is displaced downward, and the conveyance roller 17 is separated from the conveyance roller 16. This pushed the first part upward. Second
and third sheet 60. The free end of the fit 62 is displaced below the bent portion of the stopper 18, and the bent portion of the stopper 18 protrudes into the confluence of the original and copy paper conveyance paths. Further, as the shaft 27 rotates, the paper feed roller 15, which is integral with the shaft 27, rotates to feed copy paper. Claw 41
After the claw mold 40 is disengaged, the solenoid 44 is demagnetized by the above-mentioned timer, and the claw 41 comes into contact with the circumferential surface of the claw mold 40. The timer may demagnetize the solenoid 44 immediately after the pawl 41 and the pawl mold 40 are disengaged.

During the period when the follower 26 of the swing arm 24 is in contact with the second cam surface A2, which is the middle diameter of the first cam 28, the original 48 and the copy are The copy paper from the paper conveyance path 10 comes into contact with the stopper 18 to achieve leading edge alignment and posture correction. During this period, due to the action of the loose insertion roller 22, the document 48 is subjected to a force in the downstream direction in the general feeding direction even after it comes into contact with the stopper 18, so that the document may be bent.

After the edges of the original and the copy paper have been aligned and their postures corrected, the follower 26 of the swing arm 24 moves to the third cam surface A3, which is the larger diameter of the first cam 28, as shown in FIG. 2(3).
When it comes into contact with , the swinging arm 24 further moves around the pin 29 , and the shaft 21 of the conveyance roller 5 is displaced, further moving away from the conveyance roller 6 by v+fi.

As a result, the loosely inserted roller 22 is also displaced away from the document 48, as shown in FIG. 5(3). By moving the loosely inserted roller 22 away from the conveying roller 6, that is, the original 48, after the leading edges of the original and the copy paper have been aligned and the postures corrected, the bending that has occurred in the original is eliminated, and the stopper 18 The deflection that occurs in the original when the original is released prevents the original from flying out to the downstream side of the copy paper in the conveyance direction.

As another embodiment of the present invention, it may be configured such that the loosely inserted roller 22 is separated from the conveyance roller 6 and the conveyance roller 6 is also displaced downward.

When the loose insertion roller 22 is separated from the document 48, the follower 37 of the swing arm 35 is in contact with the second cam surface B2, which is the small diameter of the second cam 38, and the conveyance roller 17 is moved away from the conveyance roller 16. is estranged from.

After that, as shown in FIG. 2(4), the swing arm 24
The follower 26 contacts the first cam surface A1, which is the small diameter of the first cam 28, and the swinging arm 24 rotates counterclockwise around the pin 29, thereby causing the shaft 21 of the transport roller 5 to 6, the conveyance roller 5 and the loosely inserted roller 22 come close to the conveyance roller 6. At the same time, the follower 37 of the swinging arm 35 contacts the large-diameter cam surface B1 of the second cam 38, which causes the transport roller 17 to displace upward and contact the transport roller 16, and the document is removed by the stopper 18. 48 and the stopped state of the copy paper is released. As a result, the original 48 and the copy paper are conveyed to the printing device 20 with their leading edges aligned. Thereafter, the pawl 41 that was in contact with the circumferential surface of the pawl mold 40 engages with the pawl wheel 40 and returns to the state shown in FIG. 2(1).

As described above, in the sheet conveying device of the first copying machine according to the present invention,
During the period when the leading edge of the original and the copy paper is in contact with the stopper and stopped, the loosely inserted roller serving as one roller moves upwardly, thereby eliminating the deflection that occurs in the original. .

FIG. 7 is a sectional view showing a spring clutch 39 provided at the end of the shaft 27. Boss 5 of sprocket wheel 47
2 is fitted through the shaft 27. The end plate 53 is fixed to @27. The end plate 53 and the boss 54 are abutted against the boss 52 and fixedly fixed to the shaft 27. boss 52
．． A coil spring 55 is fitted into 54 so as to fit snugly between both bosses 52 and 54. One end 56 of the coil spring 55 is fixed to the end plate 53 and thus to the 1lWII 27. The other end 57 of the coil spring 55 is
It is fixed to a claw mold 40 that surrounds 5. The coil spring 55 is wound in a direction 58 in which the sprocket wheel 47 rotates.
(G) When the coil spring 55 is rotated once and the coil spring 55 is turned +I4, the coil spring 55 is set in a direction that tightens the bosses 52 and 54. Therefore, when the pawl 41 engages with the pawl mold 40 and the pawl mold 40 is rotated upwardly, the coil spring 55 releases its tightening force against the boss 52. Therefore, the torque of the sprocket wheel 47 is not transmitted to the shaft 27, and the pawl 41
When the pawl mold 40 is disengaged, the coil spring 55 tightens the boss 52,54, so that the shaft 27 rotates integrally with the sprocket wheel 47.

Although the above embodiment describes a diazo copying machine, the present invention is not limited to a diazo copying machine, but in a transfer type electrostatic copying machine, copying paper and the tip of a photoreceptor having a toner image corresponding to an original are used. In order to match the numbers, the copy paper is temporarily stopped by a stopper that can come into contact with the leading edge of the copy paper, and the leading edge of the copy paper is aligned 11 degrees with the leading edge of the toner image corresponding to the original on the photoreceptor. The present invention may be implemented in conjunction with a conveyance device configured such that at a time when the copy paper is no longer stopped by the stopper, the copy paper that has stopped at a glance is conveyed again for transfer.

As described above, according to the present invention, the upper roller is separated from the lower roller after a sheet such as an original or copy paper comes into contact with the stopper, so that the deflection that occurs in the sheet is eliminated, and the sheet is reliably secured after the stopper is released. It is possible to transport the paper to the next copying process with the leading edges of the paper aligned.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a sectional view showing the mechanical configuration of the embodiment of FIG. 1, FIG. 3 is a horizontal sectional view of FIG. 2, and FIG. The first cam 28 shown in FIG. 5 is a sectional view showing the relationship between the loosely inserted roller 22 and the conveying roller 6, and FIG. 6 is an enlarged view of the second cam 38 and the first cam 38. FIG. 7 is a perspective view showing the relationship between the second and third seats 60, 61, 62, and FIG. 7 is a sectional view of the spring clutch 38. 5.6, 16.17... Conveyance roller, 9...-Document detection switch, 18... Stopper, 21... Rotating shaft,
22... Loose insertion roller, 24.35... Swinging arm,
26° 37...Hollower, 28...1st cam, 38.
...Second cam, 39...Spring clutch, 51...Oshitsuko representative Patent attorney Kei Nishi

Claims (1)

[Scope of Claims] ■ A hard copy that includes a pair of upper and lower rollers that apply pressure to convey the sheet, and a stopper that temporarily stops the sheet conveyed by the pair of rollers by abutting the leading edge of the sheet. In Sakaki's sheet conveying device, ten rollers of the roller pair,
After the posture correction is completed during the period in which the leading edge of the sheet is in contact with the stopper and is stopped, it is displaced upward from the sheet and the stopped state of the sheet by the stopper is released.<-z +r-1 ,, A sheet conveying device for a copying machine whose special feature is to convey the sheet in an Akita manner together with the lower roller. (2) The upper roller is a loosely inserted roller that has an insertion hole through which a vertically displaceable rotary shaft (#4) is passed, and pinches and conveys the sheet together with the lower roller by its own weight, and the rotary shaft f'l, a conveying roller is provided which conveys the sheet while holding the sheet together with the lower roller, moves away from the sheet before the loosely inserted roller is separated from the sheet, and returns together with the loosely inserted roller. f described in range 1
Sheet conveyance device for σ photo machines.