JPH0671947B2 - Paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a sheet feeding device of a copying machine, which can be used in, for example, an electrostatic transfer type copying machine, a laser printer, an ADF and the like.

<Prior Art> Conventionally, a copying machine has a paper feed table on which a sheet is placed, a conveyance roller for conveying the paper of the paper feed table to a paper feed roller side, and a paper feed table rather than the conveyance roller. Side paper swing roller attached to the tip of a first arm that is swingable, a separation roller for preventing double feed of sheets that contacts the transport roller, and swing between the transport roller and the call roller. It is equipped with a paper intrusion prevention shutter attached to a free second arm.

The control of the intake roller and the shutter has been performed simultaneously by using a solenoid, or at different timings by separately arranged cams.

<Problems to be Solved by the Invention> However, in the former case, a large solenoid is required to swing the heavy intake roller, which causes a problem that the device itself becomes large.

Further, the latter requires a drive mechanism for each cam, which also causes a problem that the device becomes large and the number of parts increases.

Therefore, in the present invention, it is possible to reduce the size of the apparatus itself, to stabilize the swing timing of the take-in roller and the shutter, and to always perform stable feeding without malfunction even in a high-speed copying machine. The purpose of the present invention is to provide a paper feeding device that can be used.

<Means for Solving Problems> A means for solving problems according to the present invention is, as shown in FIGS. 1 and 2, a sheet feeding table 2 for feeding a sheet 1 and a sheet 1 on the sheet feeding table 2. A transport roller 5 for transporting to the paper feed rollers 3 and 4, a first arm 7 swingable around a first shaft 6 upstream of the transport roller 5 in the transport direction, and a first arm 7 of the first arm 7. A paper intake roller 8 attached to the tip, and a second arm that is swingable around the second shaft 10 between the transport roller 5 and the intake roller 8.
11 and a sheet-entry-preventing shutter 12 attached to the second arm 11, and the feeding roller 8 feeds the sheet 1 at the time of feeding.
A first cam 39 that swings the first arm 7 so that the first arm 7 is brought into non-contact with the sheet 1 during standby, and the shutter 12
A second cam that swings the second arm 11 so that the paper can enter the paper feeding position and the standby position
72 is provided, the first cam 39 and the second cam 72,
It is coaxially fitted to the driven shaft 38 side of the clutch mechanism 41 that controls the rotational drive of both cams 39 and 72, and the shutter 12 is placed in a posture capable of penetrating the paper at the time of paper feeding, and then the intake roller 8 is moved to the paper 1 Are brought into contact with each other, and the contact roller 8 is brought into non-contact with the sheet 1 during standby, and then the shutter 12 is brought into a sheet intrusion prevention posture.

<Operation> In the means for solving the above problem, the intake roller 8 is normally raised as shown in FIG. 1, but the shutter 12 is raised by the rotation of the second cam 72 during paper feeding so that the sheet can enter. After the posture is reached, the first cam 39 rotates to cause the pickup roller 8 to temporarily drop onto the sheet due to the weight of the roller itself, so that the sheet 1 is sent to the conveyance roller 5. The fed sheet is conveyed by the conveying roller 5 to the paper feed rollers 3 and 4 which are stopped, and then fed by the paper feed rollers 3 and 4.

When the sheet 1 is completely conveyed, the first cam 39 causes the first arm 7 to swing, and the pickup roller 8 is lifted so as not to contact the sheet. After that, the second arm 11 is moved by the second cam 72.
Oscillates, the shutter 12 is lowered, and the posture of preventing paper intrusion is set, and the printer stands by until the next paper feeding.

<Examples> Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a sheet feeding device of a copying machine showing an embodiment of the present invention, FIG. 2 (a) is a perspective view of the same, FIG. 2 (b) is a sectional view of a spring clutch, and FIG. ) (B) to FIGS. 5 (a) and 5 (b) are views showing the relationship between the spring clutch and the claws, and FIG. 3 (a) is a plan view showing the relationship between the two when the solenoid is off. b) is its front view, FIG. 4 (a)
Is a plan view showing the relationship between the two when the solenoid is on, FIG. 5 (b) is a front view thereof, and FIG. 5 (a) is a view when the clutch cover 45 of the spring clutch makes a slight slight rotation after the solenoid is on. The top view which shows a state and the same figure (b) are the front views.

6 to 11 are views showing the relationship between the two cams, the take-in roller and the shutter, FIG. 6 is a relationship diagram between the shutter in the standby state and the first cam, and FIG. 7 is the standby state. FIG. 8 is a diagram showing the relationship between the ingesting roller and the second cam, FIG. 8 is a diagram showing the relationship between the shutter and the second cam in the ingesting conveyance, and FIG. 9 is a diagram showing the relationship between the ingesting roller and the first cam in the ingesting conveyance. Fig. 10 is a diagram showing the relationship between the shutter and the second cam after the clutch cover 45 has rotated a little less than one revolution, and Fig. 11 is a diagram showing the relationship between the intake roller and the first cam after the clutch cover 45 has been slightly rotated a little. Is.

As shown in the figure, the sheet feeding device includes a sheet feeding table 2 for feeding the sheet 1, a conveying roller 5 for conveying the sheet 1 of the sheet feeding table 2 to the sheet feeding rollers 3 and 4, and A first arm 7 that is swingable around a first shaft 6 that is the central axis of the transport roller 5 on the side of the paper feed table 2 with respect to the transport roller 5, and a paper call attached to the tip of the first arm 7. Pickup roller 8, separation roller 9 for preventing the double feeding of the paper which comes into contact with conveyance roller 5, and second arm 11 which is swingable around second axis 10 between conveyance roller 5 and pickup roller 8. And a sheet stopping shutter 12 attached to the second arm 11.

A first shaft 6 which is a central shaft of the conveying roller 5 is rotatably supported by a main body 13 of the copying machine, and a drive gear 14 for rotationally driving the first shaft 6 is provided with a first spring clutch 15 through a first spring clutch 15. It is connected to the shaft 6. The drive gear 14 has a copier body 13
Power from the side is transmitted. First spring clutch 15
As shown in FIG. 2B, the coil spring 18 is fitted over the boss 16 formed at the shaft end of the drive gear 14 and the boss 17 formed at the end of the first shaft 6. A cylindrical clutch cover 19 externally fitted to the coil spring 18, and a cylindrical latch 20 externally fitted and fixed to the clutch cover 19.
And a first claw piece 21 that is releasably engaged with the latch 20, and a solenoid 22 as a drive unit for engaging and disengaging the first claw piece 21. Then, one end of the coil spring 18 is engaged with the clutch cover 19, and the other end is fixed to the boss 17 of the first shaft 6. The spring 18 is used for the drive gear 14
It is wound in the direction to tighten the boss 16 and the boss 11 of the first shaft 6, but the clutch cover 19 is braked (rotation restricted state).
By doing so, it becomes a state in which it is separated from the boss 16, that is, in a loosened state, and the rotational force of the drive gear 14 is not transmitted to the first shaft 6.

As shown in FIG. 3 (b), the central boss portion 23 of the first claw piece 21 is
Is rotatably fitted to the solenoid body 22a via 24,
The other end 24 of the first claw piece 21 is engaged with a pin 25 formed on the second claw piece 48, which will be described later, from the latch 20 as the second claw piece 48 rotates in the engaging direction. They are related to each other. A spring 26 that urges the first pawl 21 in the latch engagement direction is provided between the other end of the first pawl 21 and the solenoid body 22a.

As shown in FIG. 2A, the rotation driving device 27 that rotationally drives the intake roller 8 includes a first gear 28 externally fitted and fixed to the other end of the first shaft 6 of the conveying roller 5, and a first gear 28. A second gear 30 facing the one gear 28 and fixed to the rotating shaft 29 of the intake roller 8.
And an intermediate gear 31 supported by the first arm 7 interposed between the second gear 30 and the first gear 28.

A swing mechanism for swinging the first arm 7 of the intake roller 8.
As shown in FIG. 2 (a) and FIGS. 7, 9 and 11, reference numeral 33 denotes a swinging member supported by the copying machine main body 13 so as to be swingable around a support shaft 34 parallel to the rotating shaft 29 of the invoking roller 8. The moving arm 35, a long hole 36 formed at the other end of the arm 35, a connecting shaft 37 protruding from the central portion of the first arm 7 so as to fit in the long hole 36, and the swing arm. A first cam 39 fixed to a driven shaft 38 arranged in parallel with the first shaft 6 of the conveying roller 5 to swing 35.
And a follower 40 fixed to the swing arm 35 so as to come into contact with the cam surface of the first cam 39, and a power is transmitted from the copying machine main body 13 side to the driven shaft 38 via a second spring clutch 41. And a driving unit 42 for driving. The drive unit 42 includes a transmission gear 43 that meshes with the drive gear 14 and a driven gear 44 that meshes with the transmission gear 43.

The second spring clutch 41 is mounted between the rotary shaft of the driven gear 44 and the driven shaft 38, and is composed of a coil spring, a clutch cover 45 and the like like the first spring clutch 15. However, on the outer periphery of the clutch cover 45, a pair of clutch claws 4 that are axially displaced
6, 47 are provided, and a second claw piece 48 on the left side and a third claw piece 49 on the right side that engage with the clutch claws 46, 47 are provided.

The second claw piece 48 and the third claw piece 49 are fixed to a boss portion 51 that is rotatably fitted to the shaft 50 of the copying machine body 13 in a C-shape when viewed from the front, and the swing piece 52 is fixed to the boss portion 51. The swing piece 52 is connected to the plunger 22b of the solenoid 22. A second pawl 48 is provided between the swinging piece 52 and the copying machine main body 13 as a clutch pawl.
A spring 53 is attached to the spring 47 for biasing the spacer 47 in the direction of moving away.

The separation roller 9 is pressed against the transport roller 5 by a pressing mechanism 54. The pressurizing mechanism 54 is configured as follows. That is, the separation roller 9 is supported by the main body 13 of the copying machine.
Attached to the tip of the pressure lever 56 that can swing around 55,
A guide ring 57 for guiding the roller shaft 9a of the separation roller 9 in the left-right direction is formed at the tip of the pressure lever 56, and the roller shaft 9a is fitted to the guide ring 57. Further, the roller shaft 9a is fitted from above into the vertical groove 59 formed in the bearing plate 58 of the copying machine main body 13. A coil spring 61 for urging the separation roller 9 toward the transport roller 5 is provided. The coil portion of the spring 61 is wound around the support shaft 55 of the pressure lever 56,
One end 61a of the spring 61 is brought into contact with the lower side of the guide ring 57, and the other end 61b of the spring 61 is engaged with a long hole 64 of a swing piece 63 swinging around a shaft 62 of the copying machine main body 13. There is.

Then, a release mechanism 54A for releasing the biasing force of the spring 61 is provided. The release mechanism 54A is composed of the swinging piece 63 arranged below the lower guide plate 65a which constitutes the paper feed path 65 of the copying machine main body 13. That is, the leading end extension plate 2 a formed at the leading end of the paper feed table 2 is the swing piece 63 and the lower guide plate 65.
It is removably interposed between a and a. By pulling out the paper feed table 2, the swinging piece 63 is rotated upward to release the biasing force of the spring 61, and the separating roller 9 is separated from the transport roller 5 by its own weight. Composed to leave.

Further, the separation roller 9 is normally driven by the conveyance roller 5, but when two or more sheets are conveyed at the same time, the separation roller 9 is reversed to prevent double feeding. The reversing mechanism 66 is shown in FIG. That is, the reversing mechanism 66 of the separation roller 9 is integrally rotatable with the roller shaft 9a of the separation roller 9 and is fitted on the brake plate 67 so as to be slidable in the axial direction, and the brake plate 67 is pressed against the separation roller 9. And a coil spring 67a that biases the coil spring 67a. And
The separation roller 9 is prevented from rotating unless a certain torque or more is applied to the separation roller shaft 9a due to frictional resistance with the brake plate 67. The separation roller shaft 9a is
As shown in the figure, the roller is always rotated in the direction of arrow a with respect to the rotation direction of the conveying roller 5, but when the sheet is not conveyed or only one sheet is conveyed, the conveying roller 5 and the separation roller 9 , Or the frictional resistance between the sheet and the separation roller 9 is larger than the frictional resistance between the separation roller 9 and the brake plate 67,
The separation roller 9 rotates in the direction opposite to the rotation direction of the separation roller shaft 9a (arrow b in the figure), and is driven by the transport roller 5. Further, when two or more sheets are conveyed at the same time, the separation roller 9 and the brake plate 67 rather than the frictional resistance between the sheets.
Since the frictional resistance between them is greater, the separation roller 9 rotates in the same direction as the separation roller shaft 9a (arrow c in the figure) to prevent double feeding.

The rotation force is transmitted to the roller shaft 9a of the separation roller 9 from the gear 6a fixed to the first shaft 6 of the transport roller 5, as shown in FIG.

As shown in FIGS. 2 and 6, the swing mechanism 68 of the shutter 12 includes a second arm 11 for swinging the shutter which is swingable around the second shaft 10 in the copying machine main body 13, and the second arm 11. The boss 70
And an L-shaped follower 71 fixed to the first cam 39, and a second cam 72 and the like arranged coaxially with the first cam 39 to follow the follower 71. The shutter 12 is provided at the tip of the second arm 11. axis
It is connected at 73.

The shapes and mounting positions of the cams 39 and 72 are set as follows. First, the shutter 12 is lifted up by the second cam 72, and after being raised to the upper end, the first roller 39 is dropped by the first cam 39 through the arm 35. Then, by the time the spring clutch 41 makes one revolution, the first cam 39 raises the intake roller 8 in the opposite direction to the previous one, and after it has fully raised to the upper position, the shutter is released.
The timing of the cams 39 and 72 is set so that 12 is lowered, and the time during which the take-in roller 8 is descending is set to a time in which the take-in roller 8 can sufficiently feed the paper to the conveying roller 5.

A substantially L-shaped upper guide plate 74 that allows the sheet to bend is disposed between the transport roller 5 and the sheet feed rollers 3 and 4. A paper detection switch 75 is arranged near the paper feed rollers 3 and 4 at the tip of the upper guide plate 74.

Note that reference numeral 65b in the figure denotes an upper guide plate of the paper feed path 65.

Next, the operation will be described. Although the call-in roller 8 is normally raised as shown in FIG. 1, after the shutter 12 is raised during paper feeding, the call-in roller 8 is temporarily dropped on the paper by the weight of the roller itself. To feed the paper 1 to the transport roller 5. The fed sheet is conveyed by the conveyance roller 5 and the separation roller 9 to the paper feed rollers 3 and 4 which are stopped.

The sheet 1 conveyed by the conveying rollers 5 is a detection switch.
This is detected by 75, and after a certain time after the detection, the conveyance roller 5 is stopped so that a bend is created between the conveyance roller 5 and the paper feed rollers 3 and 4. Due to this bending, the paper 1 is prevented from being pushed into the paper feed rollers 3 and 4, and the tip of the paper 1 is prevented from tilting. The paper feed rollers 3 and 4 start conveying in synchronization with the table for scanning the original so that the leading edge of the image and the leading edge of the sheet 1 are aligned with each other.

In FIG. 3 (b), the solenoid is off, but the clutch cover 19 is stopped by the first claw piece 21 and the clutch cover 45 is stopped by the third claw piece 49, and the drive is stopped. Since it is not transmitted, both the conveying roller 5 and the cams 39, 72 remain stopped, and are in a standby state as shown in FIGS.

Here, when the solenoid 22 is turned on, the first claw piece 21 opens the clutch cover 19 and the drive is transmitted to the first shaft 6,
The transport roller 5 starts to rotate. Due to the rotation of the first shaft 6, the intake roller 8 also starts to rotate via the gears 28, 31, 30. Further, as shown in FIG. 4, the third claw piece 49 is also released and the cams 39, 72 are also rotated, so that the shutter 12 and the take-in roller 8 start to operate as shown in FIG. ).

Right and left claws 46,47 of the second spring clutch 41
Is displaced in the axial direction, and the second pawl piece 48 and the third pawl piece 49 are also displaced, so that the solenoid 22
After a little less than one rotation after the switch is turned on, the second claw piece is
It costs 48. Therefore, with the solenoid 22 still in the ON state, the spring clutch 15 transmits the drive and the transport roller 5
Continues to rotate, but the spring clutch 41 stops the drive in less than one rotation, and stops the rotation of the cams 39 and 72. At this time, the first
As shown in FIG. 1, the take-in roller 8 has already risen, and as shown in FIG. 10, the shutter 12 has already come down (paper conveyance).

Then, in order to create a bend in the paper, the solenoid 22 is turned off after a certain time has passed after the detection by the detection switch 75.

When the solenoid 22 is turned off, the first claw piece 21 of the spring clutch 41 is hooked on the clutch cover 19, so that the transport roller 5
Will stop. In addition, the spring clutch 41 also rotates the remaining one rotation before the previous rotation and then stops and then returns to the initial state (3rd rotation).
Return to the figure) and complete the paper feed operation (creating the paper deflection,
Standby state).

The paper feed table 2 is for stacking sheets, but the paper feed table 2 can be removed when carrying it. When the paper feed table 2 is removed as shown in FIG. The pressurization is released, and the conveyance roller 5 and the separation roller 9 are separated from each other, so that the sheet 1 sandwiched between the rollers 5 and 9 can be easily removed.

The roller shaft 9a of the separation roller 9 is pressed by the pressure lever 56, and the guide ring 57 for receiving the roller shaft 9a of the pressure lever 56 is a lateral elongated hole. Since the lateral direction is controlled by the vertical groove 59 of the guide plate 58, the separation roller 9 is always pressed from directly below the conveyance roller 5.

The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, the clutch mechanism is not limited to the spring clutch and may be another mechanism.

<Effects of the Invention> As is apparent from the above description, according to the present invention, the two rollers provided on the same shaft are used, and at the time of sheet feeding, the sheet feeding roller is moved after the shutter is moved to the sheet penetrable posture. When the paper is fed, the shutter is moved to the paper intrusion prevention posture after the feeding roller is separated from the paper after the paper feeding is completed. The paper can be quickly fed, and the jamming of the paper due to the shutter can be prevented.

Further, since the operation timings of the call-in roller and the shutter are stable, it is possible to reliably feed the paper.

Therefore, downsizing of the apparatus itself can be achieved, and stable feeding can always be performed without malfunction even in high-speed copying operation.

[Brief description of drawings]

1 is a front view of a sheet feeding device of a copying machine showing an embodiment of the present invention, FIG. 2 (a) is a perspective view of the same, and FIG. 2 (b) is a sectional view of a spring clutch. 3 (a) (b) to 5 (a) (b) are views showing the relationship between the spring clutch and the claw, and FIG. 3 (a) is a plane view showing the relationship between the two when the solenoid is off. FIG. 4B is a front view thereof, FIG. 4A is a plan view showing the relationship between the two when the solenoid is on, FIG. 4B is its front view, and FIG. 5A is a solenoid. Is a plan view showing a state in which the clutch cover 45 of the spring clutch is slightly rotated a little after turning on, and FIG. 7B is a front view thereof. 6 to 11 are views showing the relationship between the two cams, the introduction roller and the shutter, FIG. 6 is a relationship diagram between the shutter in the standby state and the first cam, and FIG. 7 is the call in the standby state. FIG. 8 is a diagram showing the relationship between the take-in roller and the second cam, FIG. 8 is a diagram showing the relationship between the shutter and the second cam at the time of feeding and conveying, and FIG. Fig. 10 is a diagram showing the relationship between the shutter and the second cam after the clutch cover 45 has been rotated a little, and Fig. 11 is a diagram showing the clutch cover 45
FIG. 6 is a diagram showing the relationship between the ingesting roller and the first cam after a slight rotation. FIG. 12 is a front view showing the pressing mechanism of the separation roller, FIG. 13 is an enlarged view of the main part thereof, FIG. 14 is a partially cutaway side view showing the reversing mechanism of the separation roller, and FIG. It is a front view showing a rotation direction. 1: Paper, 2: Paper feed stand, 3, 4: Paper feed roller, 5: Conveyor roller, 6:
1st axis, 7: 1st arm, 8: Incoming roller, 9: Separation roller,
10: Second axis, 11: Second arm, 12: Shutter, 15,41: Spring clutch, 19,45: Clutch cover, 21,48,49: Claw piece, 22: Solenoid.

Claims (1)

[Claims] 1. A paper feed table for feeding a sheet, and a feed roller for feeding the paper on the paper feed roller side to the feed roller side.
Between the first arm, which is swingable around the first axis on the upstream side in the transport direction with respect to the transport roller, the paper feed roller attached to the tip of the first arm, and between the transport roller and the call roller. A second arm swingable around a second axis and a paper intrusion prevention shutter attached to the second arm are provided, and the call-in roller is brought into contact with the paper at the time of paper feeding and not in contact with the paper at standby. A second cam that swings the first arm so that the second arm swings so that the shutter has a posture that allows the sheet to enter the sheet when feeding and a posture that prevents the sheet from entering the standby state. A cam is provided, the first cam and the second cam are coaxially fitted to the driven shaft side of a clutch mechanism that controls the rotational drive of both cams, and the shutter is in a posture that allows the sheet to enter the sheet at the time of sheet feeding. After that, the call-in roller comes into contact with the paper and waits Paper feeding apparatus being characterized in that are related to each other such that the sheet intrusion prevention posture shutter after the drawing roller in the paper and non-contact manner.