JPH10120239A - Recording medium conveying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a recording medium which causes jam during conveyance by providing a third conveying means which comes into contact with paper which is collected between a first conveyance means and a second conveying means and is moved in a recording medium conveying device provided with the first and second conveying means which are provided along the direction of conveyance. SOLUTION: Recording paper 8 which is supplied by a paper supply roller 5 which is a first conveying means is directed toward a pair of resist rollers 4a, 4b which is a second conveyance means from a conveyance passage. Here, if recording paper 8 which is shorter than distance L between the pair of register rollers 4a, 4b and the paper supply roller 5 is supplied, jam occurs. In this case, a grip on a shaft 1d is rotated to rotate a roller 1 shaped like a half moon which is a third conveying means in the direction of arrow E, a high friction member 1c is brought into contact with the recording paper 8 which causes jam to push the recording paper 8 into a recessed part 3a, and the roller 1 shaped like the half moon is further rotated to convey the recording paper 8 in the direction of arrow A so that it reaches the pair of register rollers 4a, 4b and is discharged into a region X.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a recording medium transport device incorporated in, for example, an image forming apparatus for transporting a recording medium in a predetermined transport direction.

[0002]

2. Description of the Related Art Conventionally, an image forming apparatus using an electrophotographic method has been widely used. In the electrophotographic image forming apparatus, for example, while rotating a drum-shaped image carrier (photoconductor) at a predetermined process speed, the photoconductor is uniformly charged by a charging device and recorded on a document. The photosensitive member is irradiated with light carrying image information to form an electrostatic latent image on the photosensitive member, and the electrostatic latent image is developed using a developer to form a developed image, and the developed image is recorded. This is a device that obtains a print image (copy image) by transferring it to a recording medium such as paper.

[0003] Such an image forming apparatus generally includes a paper feeding device (an example of a recording medium transport device) that transports a recording sheet to a transfer area where a developed image is transferred to the recording sheet. An example of this paper feeder will be described with reference to FIG.

FIG. 3 is a schematic diagram showing an example of a sheet feeding device.

In the paper feeding device, the recording paper is fed one by one in the direction of arrow A by a paper feed roller 5 and a separation pad 6 from a cassette (not shown) on which a plurality of recording papers 8 'are stacked. . The recording paper 8 fed by the paper feed roller 5 and the separation pad 6 is conveyed to a pair of registration rollers 4a and 4b through a conveyance path between the upper guides 2a and 2b and the lower guide 3.

However, when the recording paper 8 having a length less than the specification less than the distance L between the pair of registration rollers 4a and 4b and the paper feed roller 5 is erroneously passed, the pair of registration rollers 4a and 4b The recording paper 8 cannot be conveyed between the paper feed roller 5 and the paper stays (jam). When such a jam occurs, the upper guide 2a rotates in the direction of arrow B about the hinge 2d in order to remove the recording paper 8. In addition, in this type of apparatus, generally, in order to rotate the upper guide 2a, the unit 7 disposed above the upper guide 2a is moved by an arrow C.
It can be turned in any direction.

[0007]

As described above, in the conventional image forming apparatus, in order to remove the recording paper staying in the middle of the conveyance, a part of the components forming the conveyance path or the upper or lower part of the conveyance path is removed. Arranged components and the like are configured to be rotatable, and by rotating these components, the recording paper that has been jammed is removed.

In recent years, for example, A1 size or A0 size
Large-sized image forming apparatuses for forming an image on recording paper of a large format such as a size are also widely used. Even in this large-sized image forming apparatus, a small-sized recording sheet out of specifications may be used by mistake. If the recording paper of such a small size is jammed in the middle of conveyance, the apparatus main body is large, so that an opening is formed in the apparatus main body in order to easily remove the jammed recording paper, If various parts are made rotatable, there is a problem that the mechanism becomes complicated and the cost increases.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a recording medium transport apparatus that can easily remove a recording medium that has been jammed during transportation.

[0010]

According to a first aspect of the present invention, there is provided a recording medium transporting apparatus for transporting a recording medium in a predetermined transporting direction. And a second transport unit that is disposed downstream of the unit in the predetermined transport direction and transports the recording medium further downstream in the predetermined transport direction. The recording unit that has been transported to the first transport unit In the recording medium transporting device for transporting a medium to the second transporting means, (1) a contact position at which a sheet stays between the first transporting means and the second transporting means, and the stayed paper A third transport unit that transports the stagnated paper to the second transport unit by moving between a non-contact position away from the printer and moving in a predetermined direction when located at the contact position. It is characterized by the following.

According to a second aspect of the present invention, there is provided a recording medium transporting apparatus comprising: a first roller for transporting a sheet in a predetermined transport direction; A second roller disposed downstream of the first direction and transporting the sheet further downstream in the predetermined transport direction;
A guide plate disposed between the first and second rollers for guiding the sheet conveyed by the second roller to the second roller, and the recording medium conveyed to the first roller And (2) an arc-shaped portion that contacts the sheet staying between the first roller and the second roller and a non-contact portion between the arc-shaped portion and the staying sheet. Having a planar portion of contact;
A semi-lunar roller is provided which, when rotated in a predetermined direction, causes the arc-shaped portion to come into contact with the staying paper and transport the staying paper to the second roller.

Here, it is preferable that the semi-lunar roller has a high friction member for increasing a friction coefficient with respect to the staying paper fixed to the arc-shaped portion.

[0013] It is preferable that a positioning means is provided for fixing the half-moon roller in a state where the arc-shaped portion is located at a position distant from the conveyance path on the guide plate.

Further, it is preferable that a recess is formed in a portion of the guide plate facing the half-moon roller.

Further, it is preferable that the apparatus further comprises an interlocking means for rotating at least one of the first and second rollers in conjunction with the semi-lunar roller rotating in the predetermined direction.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a recording medium transport device according to the present invention will be described with reference to the drawings.

FIG. 1 is a side view schematically showing a recording medium conveying device incorporated in a copying machine which is a known image forming apparatus, and FIG. 2 is a perspective view showing the recording medium conveying device of FIG. . Here, a paper feeder that transports a recording sheet to a transfer area where a developed image is transferred to the recording sheet will be described as an example of the recording medium transporting apparatus.

The paper feeder 20 feeds recording papers one by one from a cassette (not shown) on which a plurality of recording papers 8 'are stacked (an example of a predetermined conveying direction in the present invention). And a separation pad 6 which is an example of a first roller according to the present invention. Here, the paper feed roller 5 and the separation pad 6 constitute a first transport unit according to the present invention. Also, the paper feeding device 2
Reference numeral 0 denotes a pair of registration rollers (which are an example of a second roller and a second conveying unit according to the present invention) 4a and 4b downstream of the sheet feeding roller 5 in the conveying direction. A pair of guide plates including an upper guide 2 and a lower guide 3 having an opening 2e at the center is disposed between the paper feed roller 5 and the pair of registration rollers 4a and 4b. A recording paper transport path is formed between the guide 3 and the guide 3. A sensor 10 for detecting the stagnation of the recording paper is arranged in a portion of the upper guide 2 near the registration roller pair 4a, 4b.

The paper feeding device 20 is a half-moon-shaped roller (an example of a third conveying means according to the present invention) at a substantially intermediate portion of a distance between the paper feeding roller 5 and the registration roller pair 4a, 4b. ) 1 is provided. The semilunar roller 1 is pivotally supported by a side plate (not shown), and is arranged in parallel with the registration rollers 4 a and 4 b and the paper feed roller 5.

The semi-lunar roller 1 is provided with an opening 2 e of the upper guide 2.
And an opening 2e of the upper guide 2
Is a half-moon-shaped member having a planar portion 1b substantially blocking the surface. A high friction member 1c made of silicon rubber or the like is attached to the arc-shaped portion 1a of the half-moon roller 1 in order to increase the friction coefficient with respect to the recording paper.

A coil spring (an example of a positioning means according to the present invention) is provided on a side surface of a portion of the semi-lunar roller 1 which is above the upper guide 2 and is slightly upstream of the rotating shaft 1d in the conveying direction. 9) is formed with a spring hook 1e on which one end 9a of the spring 9 is hooked. The other end 9 of the coil spring 9
b is hung on a fixing plate 2f formed on the upper surface of the upper guide 2. By the toggle mechanism using the coil spring 9, the semilunar roller 1 is fixed in an initial state in which the arc-shaped portion 1a is separated from the transport path and the opening 2e is almost closed by the flat portion 1b.

The rotating shaft 1d of the half-moon roller 1 extends in a direction perpendicular to the conveying direction, and a knob 11 is fixed to one end. The half-moon roller 1 moves the knob 11 to the arrow D
The high friction member 1c is configured to rotate in the direction of arrow E in conjunction with the rotation in the direction of arrow E, and the rotation in the direction of arrow E makes contact with the recording sheet 8 that has been jammed in the transport path.

A recess 3a is formed in a portion of the lower guide 3 facing the half-moon roller 1. The recording paper 8 contacted by the high friction member 1c is slightly pushed into the concave portion 3a, and comes into contact with the high friction member 1c on a wide surface due to the stiffness of the recording paper 8.

The operation of the above-described paper feeding device 20 will be described.

The recording paper 8 fed by the paper feed roller 5 rotating in the direction of arrow F and the separation pad 6 urged in the direction of arrow G is transported by the conveying path formed by the upper guide 2 and the lower guide 3. Is transported to the pair of registration rollers 4a and 4b. Here, if the recording paper 8 shorter than the distance (conveying path length) L between the pair of registration rollers 4a, 4b and the paper feed roller 5 is erroneously fed, the recording paper 8 is removed from the pair of registration rollers 4a, 4b. 4b and the trailing edge of the paper is
The sensor 10 stops at the same time as the user leaves, and a jam is detected by the sensor 10.

When such a jam is detected, when the knob 11 is manually rotated in the direction of arrow D, the half-moon roller 1 rotates in the direction of arrow E, and the recording paper 8 that has been jammed in the conveyance path has high friction. When the member 1c comes into contact, the recording paper 8 is slightly pushed into the concave portion 3a. When the knob 11 is further rotated in the direction of arrow D, the half-moon roller 1 is further rotated in the direction of arrow E,
The recording paper 8 is conveyed in the direction of arrow A, reaches the pair of registration rollers 4a, 4b, and rotates the knob 12 fixed to the pair of registration rollers 4b to rotate the pair of registration rollers 4a, 4b.
Is discharged to the area X when is rotated.

After the jammed recording paper 8 has been discharged, when the hand is released from the knob 11, the half-moon-shaped roller 1 is rotated in the direction of the arrow E or in the opposite direction by the above-described toggle mechanism, and the arc-shaped portion 1a is rotated. Moves away from the transport path and returns to the initial state in which the opening 2e is substantially closed by the planar portion 1b and is fixed.

Here, the knob 11 and the registration roller pair 4b
And a pair of registration rollers 4a and 4b are rotated in conjunction with the half-moon-shaped roller 1 rotating in the direction of arrow E by connecting the knob 12 with a gear or belt (an example of an interlocking means according to the present invention). , Or in conjunction with the semilunar roller 1 rotating in the direction opposite to the arrow E,
Is configured to rotate in the direction opposite to arrow F,
Jammed recording paper can be more easily discharged.

The present invention is not limited to the above-described embodiment, and can be variously modified. For example, a plurality of half-months may be used depending on the conveyance length of a guide for conveying a recording medium or for a recording sheet having a wide width. The rollers may be arranged in a row in the recording paper transport direction or arranged in a direction perpendicular to the transport direction to improve the operability of the jam processing.

[0030]

As described above, according to the first recording medium transport apparatus of the present invention, by moving the third transport means to the contact position and moving it in the predetermined direction, the paper staying during the transport is transported. Can be conveyed to the second conveying means, so that the recording medium having the jam can be easily removed.

Further, according to the second recording medium transport apparatus of the present invention, the semicircular roller is rotated in a predetermined direction, so that the arc-shaped portion comes into contact with the retained paper, and this paper is transported to the second recording medium.
, The jammed recording medium can be easily removed by a simple operation. In addition, since the jam processing is performed by the half-moon roller, a jam processing mechanism can be provided at low cost.

Here, when the semi-lunar roller is a member in which a high friction member for increasing the coefficient of friction against the staying paper is fixed to the arc-shaped portion, the staying paper can be removed more reliably.

In the case where positioning means for fixing the semi-lunar roller with the arcuate portion positioned at a position distant from the conveyance path sandwiched between the guide plates is provided, after the jam processing is completed, The roller can be easily returned to the original position.

Further, when the guide plate has a concave portion formed in a portion facing the half-moon roller, the area of the paper in contact with the arc-shaped portion is increased, and the accumulated paper can be more easily removed. I can remove it.

Further, in the case where there is provided an interlocking means for rotating at least one of the first and second rollers in conjunction with the half-moon-shaped roller rotating in a predetermined direction, the accumulated paper can be further easily removed. Easy to remove.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a recording medium transport device of the present invention incorporated in a known image forming apparatus.

FIG. 2 is a perspective view showing the recording medium transport device of FIG.

FIG. 3 is a schematic diagram showing a conventional recording medium transport device.

[Explanation of symbols]

 Reference Signs List 1 semicircular roller 1c high friction member 2 upper guide 2e opening 3 lower guide 4a, 4b registration roller pair 5 paper feed roller 6 separation pad 8 recording paper 9 coil spring 10 sensor 11, 12 knob

Claims (6)

[Claims] A first conveyance unit that conveys the recording medium in a predetermined conveyance direction; and a first conveyance unit that is disposed downstream of the first conveyance unit in the predetermined conveyance direction. A second transport unit for transporting further downstream.
In a recording medium transporting device for transporting a recording medium transported to the first transporting device to the second transporting device, a recording medium transported between the first transporting device and the second transporting device may be used. The stagnated sheet is transported to the second transport unit by moving between a contact position where the sheet is in contact and a non-contact position away from the stagnated sheet, and moving in a predetermined direction when the stagnant sheet is located at the contact position. A recording medium conveying device, comprising: 2. A first roller for transporting a sheet in a predetermined transport direction, and a first roller disposed downstream of the first roller in the predetermined transport direction, and a sheet further downstream in the predetermined transport direction than the first roller. A second roller for conveying, and a guide plate disposed between the first and second rollers for guiding the sheet conveyed by the first roller to the second roller; In a recording medium conveying device for conveying a recording medium conveyed to a first roller to the second roller, an arc-shaped portion that contacts a sheet staying between the first roller and the second roller And the retained paper has a non-contact planar portion, and by rotating in a predetermined direction, the arc-shaped portion contacts the retained paper and transfers the retained paper to the second roller. Equipped with half-moon roller Recording medium transport device, characterized in that the. 3. The recording medium transport device according to claim 2, wherein the half-moon-shaped roller is formed by fixing a high-friction member that increases a coefficient of friction to the staying paper to the arc-shaped portion. 4. The device according to claim 2, further comprising positioning means for fixing said half-moon roller in a state where said arc-shaped portion is located at a position distant from a conveyance path on said guide plate. Recording medium transport device. 5. The recording medium transport apparatus according to claim 2, wherein a concave portion is formed in a portion of the guide plate facing the half-moon roller. 6. The apparatus according to claim 2, further comprising interlocking means for interlocking with said at least one of said first and second rollers in conjunction with said half-moon shaped roller rotating in said predetermined direction. The recording medium transport device according to any one of the preceding claims.