JPH061506A - Paper sheet supplying device - Google Patents

Abstract

PURPOSE:To provide a paper sheet supplying device, which can immediately detect the reversely set state of a rolled paper sheet after setting thereof by means of a simple structure. CONSTITUTION:If a rolled paper sheet 35 is set in the reverse direction and a paper sheet 37 is drawn by a drawing roller pair, the rolled paper sheet 35 tends to rotate counterclockwise together with a rolled paper sheet holding flange 50. Thereby, a rubber roller 52 tends to rotate clockwise, but the rotation of the rubber roller 52 is regulated, and the rotation of the rubber roller 52 and the rolled paper sheet holding flange 50 is subjected to a load, because this direction is the reverse rotational direction (A direction) of a one way clutch 54. Therefore, the tension more than a fixed value is generated on the drawing roller pair 36, and the rolled paper sheet holding flange 54 is floated by this tension, then a detecting sensor 55 is turned on, so that the reverse set state is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet feeding device for feeding a sheet from a roll sheet to an image forming section such as a copying machine or a facsimile machine, and more particularly to a reverse set detecting means for detecting a reverse set state of the roll sheet. The present invention relates to a sheet feeding device provided with.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus for making a recording sheet by using a large-sized original such as a large-sized drawing, a roll paper is attached to a paper feeding section without using a cut paper, and The paper is cut according to the size and sent to the image recording unit.

In such an image recording apparatus, the paper drawn from the roll paper is in a curled state in the winding direction of the roll paper, and various problems occur when the roll paper is set in the reverse direction. To do. For example, when the roll paper is set normally, the curl direction of the paper 37 is opposite to the curving direction of the surface of the photoconductor drum 11 as shown in FIG. Although there is no danger of winding the paper around the drum 11, when the roll paper is set in the opposite way, the paper 37 as shown in FIG.
The curl direction is the same as the curving direction of the photosensitive drum 11, and the paper 37 is wound around the photosensitive drum 11. Therefore, there is a problem that the transfer is not performed well, an image shift occurs, and the paper is jammed.

Further, the guide path of the paper 37 is designed in accordance with the curl direction so that the paper can be conveyed normally. When the paper 37 is set in the reverse direction, the paper 37 can be conveyed well. There was a problem that I wasn't told.

Conventionally, in order to prevent the start of the operation while the roll paper is set in the reverse direction, a device for detecting the reverse setting state of the roll paper is conventionally provided as, for example, the actual development 61. There is a roll paper loading mechanism disclosed in JP-A-39715. In this mechanism, a sensor that detects that the roll paper has rotated in the opposite direction is arranged with respect to the bearing member that supports the roll paper, and when the roll paper is set in the opposite direction, the sensor detects that fact. It is configured to detect. This roll paper detection mechanism can be easily applied to a small size roll paper used in a facsimile because the roll paper support mechanism is relatively simple.

[0006]

However, in this roll paper detection mechanism, a predetermined time has elapsed since the roll paper was mounted in the paper feed section of the facsimile and the switch of the apparatus was turned on to start the paper feed operation. Later, the information that it has been set in the opposite direction is output. For this reason, even when the roll paper is set in the reverse direction, there is a problem that it is determined that the reception is impossible after the facsimile reception is started.

In order to solve such a problem, the applicant of the present invention can first set the roll paper in the paper feed unit and immediately output the reverse set information in a state in which the roll paper is slightly rotated to pull out the roll paper. We proposed a roll paper reverse setting prevention device (Japanese Patent Application No. 3-159673).

In this apparatus, a gear member is integrally provided on a shaft member that supports roll paper, the shaft member is supported by a recess of the support member, and is rotatably provided in the paper feeding direction, and the recess is formed in the support member. , An upright wall member is arranged on one side and an inclined surface is arranged on the other side, and a gear member with a one-way clutch is arranged on the supporting member in correspondence with the gear of the shaft member supporting the roll paper. Then, a link member that is swung along with the movement of the shaft member is disposed above the shaft member that supports the roll paper, and the swing of the link member is detected, so that the roll paper moves in the opposite direction. The configuration is such that means for outputting information on movement is arranged. With this roll paper reverse set prevention device, when the roll paper is set and the leading edge of the paper is nipped by the transport roller, the roll paper is pulled out from the concave portion of the support member with the paper pulled out slightly from the roll paper. Moving. Therefore, at the initial stage of setting the roll paper, it can be known that the roll paper has been set in the opposite direction.

However, this roll paper reverse setting prevention device has a problem that the mechanism is complicated and the cost is increased.

The present invention has been made in view of the above problems, and an object thereof is an inexpensive structure capable of detecting that the roll paper is set in the reverse direction at the initial stage when the roll paper is set. To provide a sheet feeding device.

[0011]

SUMMARY OF THE INVENTION A paper feeding device according to the present invention comprises a pair of rolls for holding a paper pull-out means for pulling out a paper while rotating the roll paper and holding both ends of the roll paper and rotating the roll paper together. Paper holding flanges, and a flange support that supports these paper holding flanges and rotates following the paper holding flanges,
A rotation direction restricting unit that allows rotation of the flange support in the rotation direction when the roll paper is normally set and restricts rotation in the rotation direction when the roll paper is reversely set, and rotation by the rotation direction restricting unit. And a detection unit that detects the regulation state and detects the reverse setting state of the roll paper.

In this paper feeding device, when the roll paper is set in the opposite direction on the flange support together with the roll paper holding flange, the paper withdrawing means is actuated so that the roll paper is reversed from the normal direction as the paper is withdrawn. Try to rotate in the direction. For this reason, the flange support also tries to rotate in the opposite direction, but rotation in that direction is blocked by the rotation direction restricting means (one-way clutch), and the flange support, roll paper holding flange, roll paper, and paper pull-out means are loaded. Takes. This load condition is detected by the detection means,
It is detected that the roll paper is in the reverse set state.

[0013]

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

FIG. 7 shows a schematic structure of a copying machine equipped with a paper feeding device according to an embodiment of the present invention.

In this copying machine, a photoconductor drum 11 for forming an electrostatic latent image is arranged inside a copying machine main body 10. The manual feed sheet 13 inserted through the manual feed sheet insertion port 12 is conveyed by the pair of sheet conveyance rollers 14 to the arc-shaped guide portion 15, where the conveyance direction of the feed roller 16 is changed by about 180 degrees. Then, the toner image is transferred by passing between the photoconductor drum 11 and a transfer corotron (not shown). The manual paper 13 after transfer passes between the heating roller 17 and the pressure roller 18, and after the toner image is thermally fixed, the manual paper 13 is discharged from the manual paper discharge port 19. A document feeder 20 is provided above the copying machine body 10. This document transport unit 20
Feeds the document 22 inserted from the document insertion port 21 to the exposure section 24 by the document transport roller pair 23. Exposure unit 2
Reference numeral 4 includes a fluorescent lamp 25 for exposing the original 22, and a collective optical system 26 for forming image information on the original 22 in a slit shape on the surface of the photosensitive drum 11. The document 22 that has passed through the exposure unit 24 is discharged from the document discharge port 28 by the document conveying roller pair 27. When a plurality of copies are to be made with the same original 22, the original conveying roller pairs 23 and 27 reversely rotate and the original 22 is fed backward.

An original detection sensor 29 for detecting the arrival of the original 22 is provided near the conveying roller pair 23, and an exposure point sensor 30 is provided near the exposure section 24. Further, a feed-in sensor 31 is provided near the conveying roller pair 14, a registration sensor 32 is provided near the feed roller 16, and a paper discharge sensor 33 is provided near the manual paper discharge port 19.

A paper feeding device 34 is disposed below the copying machine main body 10. Roll paper 35 is provided inside the paper feeding device 34.
Is set. The paper 37 is pulled out from the roll paper 35 by a pair of pull-out rollers 36. Paper 3 pulled out by a pair of pull-out rollers 36
7 is a cutter unit 3 including a fixed blade 38a and a rotary blade 38b.
8 and is guided by the guide 39 to feed the sheet feeding device 3
4 is ejected from a sheet ejection port 40 provided on the upper surface of the copying machine 4, and is further provided at a lower part of the copying machine body 10.
From the photoconductor drum 11 to the inside of the copying machine main body 10, and thereafter, like the above-mentioned manual paper 13, the toner is transferred from the photoconductor drum 11 after being conveyed to the arc-shaped guide portion 15 by the conveying roller pair 14. Further, this toner image is thermally fixed and then discharged to the outside of the apparatus.

In this copying machine, the cutting position (cutter section 38) of the paper 37 fed from the roll paper 35 and the paper 3
Since the distance between the sheet 37 and the sheet standby position (registration position) 42 is very long, the sheet 37 is conveyed to the sheet standby position 42 first. That is, the original 22
When the document is inserted, the document 22 is made to stand by at the position of the exposure point sensor 30 (document standby position). Then, the paper 37 is sent out from the roll paper 35, the leading end thereof is sent out to the paper standby position 42, and when the paper is in a temporary standby state, the original 22 and the paper 37 are then resumed to be conveyed by a restart signal, and a copy cycle is started. In the case of continuous copying, when the paper 37 is cut by the cutter unit 38, the next paper is sent to the paper standby position 42 when the trailing edge of the cut paper 37 passes the registration sensor 32. On the other hand, when the exposure of the original 22 is completed in the exposure unit 24, the original 22 is reversely fed by the pair of conveying rollers 23 and 27 and returned to the original standby position, and then the above operation is repeated.

FIG. 1 is a front view showing the set portion of the roll paper 35 taken out, and FIG. 2 is a side view of the same.
Both ends of the roll paper 35 are held by a pair of roll paper holding flanges 50, respectively. These roll paper holding flanges 50 are attached to the paper 37 by the pull-out roller pair 36.
Roll paper 3 that rotates in one direction when paper is pulled out
It is designed to rotate with 5. The sheet holding flange 50 is placed and supported on two rubber rollers 52. Both ends of the shaft 51 of the rubber roller 52 are rotatably supported by the frame 53, and the rubber roller 52 is adapted to rotate following the rotation of the roll paper 35 and the paper holding flange 50. The bearing portion at one end of the shaft 51 of one rubber roller 52 is a one-way clutch 54.

As shown in FIG. 5, the one-way clutch 54 has the shaft 51 in the clockwise direction (direction of arrow A).
The rotation of the shaft 51 is restricted and the rotation of the shaft 51 is allowed only in the counterclockwise direction (direction of arrow B). A detection sensor 55 is arranged below the roll paper holding flange 50 between the two rubber rollers 52. The detection sensor 55 is a rubber roller 5 having two roll paper holding flanges 50.
It is turned off when it is normally set on the sheet 2, and turned off when the roll sheet holding flange 50 is lifted from the rubber roller 52 when the roll sheet 35 is reversely set, and this is detected.

That is, in this embodiment, when the roll paper 35 is set in the correct direction, when the paper 37 is slightly pulled out by the pull-out roller pair 36 as shown in FIG. 3, the roll paper 35 is rolled. Paper holding flange 50
Along with it, it rotates clockwise in the figure. Therefore, the rubber roller 52 rotates counterclockwise in the figure. Since this direction is the normal rotation direction (direction B) of the one-way clutch 54, the rubber roller 52 is allowed to rotate, rotates without load, and the paper 37 is pulled out normally.

However, when the roll paper 35 is set in the opposite direction, as shown in FIG. 4, when the paper 37 is pulled out by the pair of pull-out rollers 36, the roll paper 35 and the roll-paper holding flange 50 are pulled together. Tries to rotate counterclockwise in. Therefore, the rubber roller 5
2 tries to rotate in the clockwise direction in the figure, but since this direction is the reverse rotation direction (direction A) of the one-way clutch 54, the rotation of the rubber roller 52 is restricted, and the rotation of the rubber roller 52 and the roll paper holding flange 50 is restricted. Load on. Therefore, a pulling force of a certain value or more is generated by the pull-out roller pair 36, the pulling force lifts the roll paper 35 and the roll paper holding flange 54, and as a result, the detection sensor 55 is turned on. As a result, the fact that the roll paper 35 is reversely set is displayed on the display unit (not shown), and the driving of the pull-out roller pair 36 is stopped.

As described above, in the sheet feeding device 34 of this embodiment,
The one-way clutch 54 need only be provided in the bearing portion of the rubber roller 52, and it has a simple structure with no cost, and can detect the reverse set state of the roll paper 35 immediately at the initial stage when the paper 37 is pulled out. is there.

The present invention has been described with reference to the examples.
The present invention is not limited to the above embodiments, but can be variously modified without changing the gist thereof.

For example, in the above embodiment, the rubber roller 52 is used as the support of the roll paper holding flange 50, and the rotation of the roll paper holding flange 50 is transmitted by the frictional force. However, as shown in FIG. If the gear 57 is formed on the peripheral portion of the holding flange 50 and the flange support body side is the gear 56, and the rotation is transmitted by the gears 56 and 57, the roll paper holding flange 50
The slip between the flange support and the flange support is eliminated, and the reverse set state can be detected more reliably.

Further, in the above embodiment, the detection sensor 55 is provided below the roll paper holding flange 50, and the lifted state of the roll paper holding flange 50 is detected to detect the reverse set state of the roll paper 35. I chose
When the roll paper 35 is reversely set, the one-way clutch 54
The rotation of the roll paper 35 is blocked by the restriction of No. 3, and as a result, a load is also applied to the pull-out roller pair 36 and its drive motor (not shown). The set state may be detected. Further, the reverse set state may be detected by detecting a change in the conveyance speed of the sheet 37 by the pair of pull-out rollers 36 with a sensor.

[0027]

As described above, according to the paper feeding device of the present invention, the paper pulling-out means for pulling out the paper while rotating the roll paper and the both ends of the roll paper are respectively held and rotate together with the roll paper. A pair of roll paper holding flanges, a flange support that supports these paper holding flanges and rotates following the paper holding flanges, and the rotation of the flange support in the rotation direction when the roll paper is normally set. A rotation direction restricting unit that allows rotation of the roll paper when the roll paper is reversely set and a detection unit that detects the rotation restriction state by the rotation direction restricting unit and detects the reverse setting state of the roll paper. Since it is equipped with a simple structure, the reverse setting state of the roll paper can be detected quickly at the initial stage when the roll paper is set. The effect say.

[Brief description of drawings]

FIG. 1 is a plan view illustrating a configuration of a main part of a sheet feeding device according to an exemplary embodiment of the present invention viewed from the front side.

FIG. 2 is a side view of a main part of the sheet feeding device of FIG. 1 viewed from the left side.

FIG. 3 is a side view for explaining the operation when the roll paper is set in the correct direction in the paper feeder of FIG.

FIG. 4 is a side view for explaining the operation when the roll paper is set in the paper feed device of FIG. 1 in the reverse direction.

FIG. 5 is a side view for explaining the operation of the one-way clutch.

FIG. 6 is a side view showing a main configuration of a sheet feeding device according to another embodiment of the present invention.

7 is a side view showing the overall configuration of a copying machine using the paper feeding device of FIG.

FIG. 8 is a side view for explaining a problem when the roll paper is reversely set.

[Explanation of symbols]

35 ... Roll paper, 36 ... Pull-out roller pair, 37 ... Paper, 50 ... Roll paper holding flange, 52 ... Rubber roller,
53 ... Frame, 54 ... One-way clutch, 55 ... Detection sensor

Claims (1)

[Claims] 1. A paper pull-out means for pulling out a paper while rotating the roll paper, a pair of roll paper holding flanges for holding both ends of the roll paper and rotating with the roll paper, and supporting these paper holding flanges. Together with the flange support that rotates following the paper holding flange, and allow rotation of this flange support in the rotational direction when the roll paper is normally set, and rotate in the rotational direction when the roll paper is reversely set. A sheet feeding device, comprising: a rotation direction regulating unit that regulates the rotation direction regulation unit; and a detection unit that detects the rotation regulation state by the rotation direction regulation unit and detects the reverse setting state of the roll paper.