JP3161039B2 - Paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus that creates a recording sheet using a large-sized original such as a large-sized drawing, a roll paper is mounted on a paper feeding unit without using cut sheets, and the original is printed. The paper is cut in accordance with the size and sent to the image recording unit.

[0003] In such an image recording apparatus, the paper drawn from the roll paper is in a state of curled winding direction of the roll paper, various problems occur if you set the roll paper in the reverse direction I 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 photosensitive drum 11 as shown in FIG. Although there is no danger of winding around the drum 11, when the roll paper is set upside down, as shown in FIG.
Is in the same direction as the bending direction of the photosensitive drum 11, and the paper 37 winds around the photosensitive drum 11. For this reason, there has been a problem that the transfer is not performed favorably, an image shift occurs, and the paper is jammed.

[0004] The guide path of the paper 37 is designed in accordance with the curl direction so that the paper is properly transported. When the paper 37 is set in the reverse direction, the transport of the paper 37 is performed well. There was a problem that was not.

Conventionally, in order to prevent the operation from starting with the roll paper being set in the reverse direction, a detection means for detecting the reverse setting state of the roll paper has been provided .
For example, there is a roll paper loading mechanism disclosed in Japanese Utility Model Laid-Open No. 61-39715. In this mechanism, a sensor that detects that the roll paper has been 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. It is configured to detect. When this roll paper detection mechanism is applied to small-sized roll paper used for facsimile,
Since the roll paper support mechanism is relatively simple, it can be easily applied.

[0006]

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

In order to solve such a problem, the applicant of the present invention can set the roll paper in the paper feeder first, rotate the paper slightly in order to pull out the roll paper, and immediately output the reverse set information. A roll paper reverse setting prevention device has been proposed (Japanese Patent Application No. 3-159673).

In this apparatus, a gear member is integrally provided on a shaft member for supporting the roll paper, the shaft member is supported by a concave portion of the support member, and the shaft member is rotatably provided in the paper feeding direction. , 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 support member corresponding to a gear of a shaft member supporting the roll paper. A link member that swings with the movement of the shaft member is arranged above the shaft member that supports the roll paper, and the swing of the link member is detected, and the roll paper is moved in the opposite direction. In this configuration, means for outputting information of movement is arranged. In this roll paper reverse setting prevention device, when the roll paper is set and the leading end of the paper is nipped by the transport roller, the paper is slightly pulled out from the roll paper, and the roll paper is removed from the concave portion of the support member. Moving. Therefore, at the initial stage when the roll paper is set, it can be known that the roll paper has been set in the opposite direction.

[0009]

[0010]

[0011]

According to the first aspect of the present invention,
(A) Hold the roll paper and rotate it together with the held roll paper.
A pair of roll holding flanges to be rolled;
These rolls hold the roll holding flange
Rolling contact at two different points at the bottom of the holding flange
First and second rollers, and (c) a first roller among them.
Roller to allow normal rotation of the roll paper.
A rotation restricting means for restricting reverse rotation of
Transports the paper set on the roll holding flange upward
The conveying means and the (e) rotation regulating means regulate the rotation of the roll paper.
The second roller as a fulcrum,
Holding a pair of rolls by the force to transport the paper upward
Detect this movement when the flange rises up
Supplies a sensor that detects the reverse setting of the roll paper.
A paper device is provided.

That is, according to the first aspect of the present invention, a pair of rolls which hold the roll paper and rotate together with the held roll paper.
Of the first and second rollers, respectively.
Place them on top of them so that they are in contact with them.
The first roller allows normal rotation of the roll paper,
A rotation restricting means for restricting reverse rotation is attached. This
To ensure that the roll paper is set correctly and
When rotating, the pair of roll holding flanges
And does not rise from the second roller, but rolls
The paper is set upside down and the roll paper rotates in the opposite direction
This rotation is restricted by the rotation
As a result, the pair of roll holding flanges is
Float from the second roller. The sensor lifts this
The roll paper is set in reverse by detecting the movement
Will be detected.

[0013]

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

FIG. 7 shows a schematic configuration of a copying machine provided with a sheet feeding device according to an embodiment of the present invention.

In this copying machine, a photosensitive drum 11 for forming an electrostatic latent image is disposed inside a copying machine main body 10. The manual paper 13 inserted from the manual paper insertion slot 12 is conveyed by a pair of paper conveyance rollers 14 to an arcuate guide portion 15, where the conveyance direction is changed by approximately 180 degrees by the conveyance force of the feed roller 16. Thereafter, the toner image is transferred by passing between the photosensitive drum 11 and a transfer corotron (not shown). The manual paper 13 after the transfer passes between the heating roller 17 and the pressure roller 18, and is discharged from the manual paper discharge port 19 after the toner image is thermally fixed. An original transport unit 20 is provided at an upper part of the copying machine main body 10. This original transport unit 20
Feeds a document 22 inserted from a document insertion opening 21 to an exposure unit 24 by a document conveying roller pair 23. Exposure unit 2
Reference numeral 4 denotes a fluorescent lamp 25 for exposing the document 22 and a collective optical system 26 for forming image information on the document 22 in the form of a slit on the surface of the photosensitive drum 11. The document 22 that has passed through the exposure unit 24 is discharged from a document discharge port 28 by a pair of document conveying rollers 27. When a plurality of copies are made of the same original 22, the original transport roller pairs 23 and 27 are rotated in the reverse direction, and the original 22 is fed backward.

A document detection sensor 29 for detecting the arrival of the document 22 is provided near the transport roller pair 23, and an exposure point sensor 30 is provided near the exposure unit 24. Further, a feed-in sensor 31 is provided near the transport 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 arranged below the copying machine body 10. A 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 pull-out roller pair 36. Paper 3 pulled out by pull-out roller pair 36
7 is a cutter unit 3 including a fixed blade 38a and a rotary blade 38b.
8 and guided by a guide 39, the sheet feeding device 3
4 is discharged from a paper discharge port 40 provided on the upper surface of the copier main body 4 and further provided at a lower part of the copying machine body
Is fed into the copying machine main body 10, and thereafter, as in the case of the above-mentioned manual paper 13, is conveyed by the pair of conveying rollers 14 to the arcuate guide portion 15, and then the toner image is transferred from the photosensitive drum 11 After the toner image is thermally fixed, the toner image is discharged outside the apparatus.

In this copying machine, the cutting position (cutter section 38) of the paper 37 sent 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 conveyance of the sheet 37 to the sheet standby position 42 is performed first. That is, the original 22
Is inserted, the document 22 is made to stand by at the position of the exposure point sensor 30 (document standby position). Next, the paper 37 is sent out from the roll paper 35, and the leading end thereof is sent out to the paper standby position 42. When the paper 37 enters a temporary standby state, the conveyance of the original 22 and the paper 37 is restarted by the restart signal, and the copying cycle starts. In the case of continuous copying, when the sheet 37 is cut by the cutter unit 38, the next sheet is sent to the sheet standby position 42 when the trailing end of the cut sheet 37 has passed the registration sensor 32. On the other hand, when the exposure of the original 22 in the exposure unit 24 is completed, the original is returned by the pair of conveying rollers 23 and 27 and returned to the original standby position, and thereafter the above operation is repeated.

FIG. 1 is a front view showing the set portion of the roll paper 35, 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 pulled out of the paper 37 by the pull-out roller pair 36.
The roll paper 3 which rotates in one direction by being pulled out
It rotates with 5. The paper holding flange 50 is mounted and supported on two rubber rollers 52. Both ends of the shaft 51 of the rubber roller 52 are rotatably supported by a frame 53, and the rubber roller 52 rotates following the rotation of the roll paper 35 and the paper holding flange 50. A bearing 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 rotates the shaft 51 in the clockwise direction (the direction of arrow A).
Is restricted, and the rotation of the shaft 51 is allowed only in the counterclockwise direction (the direction of arrow B). A detection sensor 55 is provided below the roll paper holding flange 50 between the two rubber rollers 52. The detection sensor 55 has a configuration in which the roll paper holding flange 50 has two rubber rollers 5.
Turned off in a state where the top 2 has been successfully set, the roll paper holding flanges 50 at the time of reverse set of roll paper 35 is adapted to detect next turned on when raised from the rubber roller 52, it.

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

However, when the roll paper 35 is set in the reverse direction, as shown in FIG. 4, when the paper 37 is pulled out by the pull-out roller pair 36, the roll paper 35 is drawn together with the roll paper holding flange 50. Attempts to rotate counterclockwise at. Therefore, the rubber roller 5
2 tries to rotate in the clockwise direction in the figure, but this direction is the reverse rotation direction (A direction) of the one-way clutch 54, so that the rotation of the rubber roller 52 is restricted, and the rotation of the rubber roller 52 and the roll paper holding flange 50 are rotated. Load. For this reason, a pulling force of a certain value or more is generated by the drawer roller pair 36, and the roll paper 35 and the roll paper holding flange 54 are lifted by the pulling force, and as a result, the detection sensor 55 is turned on. As a result, the fact that the roll paper 35 is in the reverse setting state is displayed on a 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 the present embodiment,
It is only necessary to provide the one-way clutch 54 on the bearing portion of the rubber roller 52, the cost is simple, the cost is low, and the reverse setting state of the roll paper 35 can be detected immediately at the initial stage when the paper 37 is pulled out. is there.

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

For example, in the above embodiment, the rubber roller 52 is used as a support for the roll paper holding flange 50, and the rotation of the roll paper holding flange 50 is transmitted by frictional force. However, as shown in FIG. If a gear 57 is formed on the periphery of the holding flange 50 and a gear 56 is provided on the flange support side, and the gears 56 and 57 transmit rotation, the roll paper holding flange 50
There is no slippage between the support and the flange support, and the reverse setting state can be detected more reliably.

[0026]

[0027]

As described above, the invention according to claim 1 is described above.
According to a pair of roll holding francs holding roll paper
Besides the roll, the lower part of the roll holding flange is different
First and second rollers that roll at two points
Attached to the first roller for normal rotation of the roll paper
A rotation restricting means for permitting and restricting the reverse rotation;
When the roll holding flange of the
With a simple structure comprising a sensor for detecting gas, yet there is an effect that can be detected quickly reverse the set state of the roll paper in the initial stage of setting the roll paper.

[Brief description of the drawings]

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

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

FIG. 3 is a side view for explaining an operation when roll paper is set in a correct direction in the paper feeding device of FIG. 1;

FIG. 4 is a side view for explaining the operation when the roll paper is set in the paper feeding 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 illustrating a main configuration of a sheet feeding device according to another embodiment of the present invention.

FIG. 7 is a side view illustrating an overall configuration of a copying machine using the sheet feeding device of FIG.

FIG. 8 is a side view for explaining a problem at the time of reverse setting of roll paper.

[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

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-60-209460 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65H 26/00 B65H 16/08 B65H 19 / 12

Claims (1)

(57) [Claims] The roll paper is held and shared with the held roll paper.
A pair of roll holding flange that rotates, which in order to hold the pair of roll holding flange
Two different points at the bottom of each roll holding flange
The first and second rollers which are rolled and contacted by the
Rotation regulation that allows normal rotation and regulates reverse rotation
And a sheet set on the pair of roll holding flanges.
Transport means for transporting the roll paper, and the rotation regulating means regulates the rotation of the roll paper.
And the paper is conveyed by the conveying means with the second roller as a fulcrum.
The pair of roll holding flanges is
To detect this movement when the sensor floats up
And a sensor for detecting the reverse setting state of the roll paper.
A paper feeding device, comprising: