JPH03227850A - Paper feeder - Google Patents

Abstract

PURPOSE:To simplify a structure by concurrently using a turn member, to which a takeout roller is mounted, to serve as a constitutional part of a detecting means. CONSTITUTION:When a paper form P is taken out, the paper form P in a paper feed cassette is gradually lowered, and a turning angle theta of a turn arm 61 is increased in such a way as to theta1, theta2, theta3. A display part displays the paper form P in a full condition when the turning angle theta of the turn arm 61 is in a relation where theta<theta1, paper form P in a condition with its intermediate residual amount when the relation is theta1<=theta<theta2, paper form P in a condition with its residual amount left a little when the relation is theta2<=theta<theta3, and further the paper form P in a condition with no residual amount when the relation is theta3<theta. In such a way as mentioned, since the residual amount of the paper form P is detected by detecting a turning amount of the turn arm 61, it can be used to concurrently serve as a constitutional part of a detecting means, and cost can be reduced by decreasing a number of part items.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a paper feeding device provided in, for example, an electronic copying machine.

(Prior Art) An electronic T-copier is equipped with a paper feed cassette from which paper is supplied.

The paper in the paper feed cassette is taken out by a take-out roller, and the taken out paper is sent to an image transfer section between a photosensitive drum and a transfer charger, where an image is transferred.

The take-out roller is attached to the rotating end of a rotating arm (rotating member), and this rotating arm rotates each time the take-out roller takes out a sheet of paper, bringing the take-out roller into contact with the next sheet. There is.

By the way, the paper in the paper feed cassette decreases as it is fed, but the remaining amount is detected by a detection means and displayed on the display section of the operation section.

(Problems to be Solved by the Invention) However, in the past, the paper remaining amount detecting means was constituted by a dedicated member, which resulted in a problem of structural complexity and high cost.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sheet feeding device that can be horizontally simplified by using the co-moving member to which the take-out roller is attached also as a component of the detection means.

[Structure of the Invention] (Means for Solving the Three Problems) In order to solve the above problems, the present invention provides a paper feed cassette that stores paper, a take-out roller that takes out the paper from the paper feed cassette, and this take-out roller. a rotating member that moves the take-out roller in the direction of contacting the paper each time the #11 paper is not taken out, and a detector that detects the remaining amount of the paper by detecting the amount of simultaneous movement of the rotating member. It is characterized by comprising the following.

(Function) Every time the paper is fed by the take-out roller, the rotating member rotates and tilts, and the amount of this tilt is detected by a detector to detect the remaining amount of paper.

(Example) The present invention will be described below with reference to an example shown on the oral surface.

FIG. 2 shows an electronic copying machine, in which reference numeral 1 indicates the copying machine main body. A photoreceptor drum 2 is provided in the copying machine body 1 so as to be rotatable in the direction of the arrow.A charger 3, an exposure section 4, a developer 2M, and a developer 2M are arranged around the photoreceptor drum 2 in order along the direction of rotation. 5 a, 5
A transfer and peeling charger 6, 7, a cleaning device (16 stages of cleaning) 8, and a static eliminator 9 are provided.

A conveyance path 10 is provided approximately at the center of the copying machine main body 1, and the conveyance path 10 sequentially includes the following along the conveyance direction of the paper P.
Registration roller 12, transfer and peeling charger 6.
7. Conveyor belt 11. Fixing device 1 and discharge roller 1
4 are arranged.

Further, an exposure system 41 is provided on the upper side of the copying machine main body 1.

This exposure system 41 includes an exposure lamp 42 and a first reflection mirror 43 provided on a first carriage (not shown), and second and third reflection mirrors 44 provided on a second carriage (not shown). 45, a lens 46, and fourth to sixth reflecting mirrors 47, 48, and 49.

The first and second carriages are configured to reciprocate along a document glass 50 provided on the upper surface of the copying machine main body 1.

Reference numeral 51 denotes a line flow fan, and the line flow fan 51 allows hot air inside the copying machine main body 1 to be exhausted to the outside.

On one side of the copying machine main body 1 are upper and lower paper feed cassettes 2.
2.23 are provided, and a paper discharge tray 24 is provided on the other side.

The paper P in the paper feed cassettes 22 and 23 is taken out by a take-out roller 24, and the taken-out paper P is sent between a paper feed roller 26 and a separation roller 27.

During image formation, the exposure system 41 exposes the document to light, and an image of the document is formed on the surface of the photoreceptor drum 20. The surface of the photosensitive drum 2 is charged by a charging charger 3, and an electrostatic latent image of the document is formed by the image formation. This static electricity/F? The image is sent to the developing device 5a or 5b by the rotation of the photosensitive drum 2, and from this developing device 5a or 5b the image is developed 11! Toner is supplied as a shaving.

On the other hand, at this time, sheets of paper P are taken out one by one from the paper feed cassette 22 or 23, and the registration roller pair 12
sent to. After the paper P is aligned by the registration roller pair 12, it is sent to the image transfer section 6a between the photosensitive drum 2 and the transfer charger 6, and the image is transferred thereto. The paper P to which this image has been transferred is peeled off from the photosensitive drum 2 by the action of the peeling charger 7. Then, the peeled paper P is sent to the fixing device 13, and after the image is fixed by the fixing device 13, it is ejected onto the paper ejection tray 24 via the ejection roller 14.

By the way, as shown in FIGS. 1 and 5, the take-out roller 25 is attached via a shaft 62 to the rotating end of a rotating arm 61 as a rotating member. The base end of the rotary arm 61 is fixed to a support shaft 63, and as the support shaft 63 rotates in forward and reverse directions, the rotary arm 61 rotates in the upward direction.

A triangular slit plate 64 is attached to one side of the rotating arm 61, and the slit plate 64 has first to third slits 65, 66, 6 in the rotating direction.
7 is drilled. This slit plate 64 rotates together with the rotating arm 61, and has a slit 65 on the rotating end side.
, 66 and 67 are placed between a light emitting element (not shown) and a light receiving element (not shown) of a photosensor 68 as a detector. Further, a first gear 69 is attached to the shaft 62 of the take-out roller 25, and the support shaft 69 is attached to the shaft 62 of the take-out roller 25.
3 has a second gear 70 attached thereto.

-h, the paper feed roller 26 is attached to a drive shaft 72, and a third gear 73 is attached to this drive shaft 72.

A power transmission belt 74 is connected between the first gear 69 and the second gear 70, and a drive belt 75 is connected between the second gear 70 and the third gear 73. has been done.

Further, as shown in FIG. 5, a through hole 76 is formed in the bottom of the paper feed cassette 22, 23, and a light reflecting type paper empty sensor 77 is provided below the through hole 76. There is.

The copying machine main body 1 is placed on a mounting table 28, as shown in FIG. ing. The operation section 29 includes a zoom setting section 3U, reduction, enlargement, and same magnification setting sections 31, 32, 33, an automatic exposure button 34, a density setting section 35, a display section 36. A copy number setting section 37, a copy button 38, and the like are provided.

Therefore, when feeding paper, the drive shaft 72 is rotationally driven and the paper feeding roller 26 is rotated in the direction of the arrow.
The separation roller 27 is simultaneously rotated in the opposite direction, and the drive belt 75 is run via the first gear 73. This allows the second gear 70, the power transmission belt 74, and the first
The take-out roller 25 is rotated in the direction of the arrow via the gear 69, and the paper P is taken out. Every time this paper P is taken out, the rotating arm 61 rotates downward, and the take-out roller 2
5 is brought into contact with the next sheet P. Paper cassette 22.23
Thereafter, the sheets P inside are sequentially taken out in the same manner.

The taken out paper P is passed through the paper feed roller 26 and separation roller 27.
The paper is then separated into sheets and sent out.

In this way, when the paper P is taken out, the paper P in the paper feed cassette 22, 23 gradually decreases, and the rotating arm 6
1, as shown in FIGS. 7(a) to (C), the rotation angle θ is θ7. θ2. Increase θ.

As shown in FIG. 7(a), when the rotation angle θ of the rotation arm 61 is θ, the light from the light emitting iron of the photosensor 68 is blocked by the plate surface of the slit plate 64. As shown in FIG. 8(a), the display unit 36 displays that the paper P is full.

Further, when the co-movement angle θ of the co-movement arm 61 satisfies θ1≦θ<θ2 as shown in FIG. 65, the photo sensor 68 is turned on as shown in FIG. 6, and as shown in FIG. Something is displayed.

Further, when the rotation angle θ of the rotation arm 61 is θ1≦θ<θ2 as shown in FIG. 7(C), the light from the light emitting element of the photosensor 68 is transmitted to the second After passing through the slit 65, the photosensor 68 is turned on for 24 seconds, and as shown in FIG. 8(c), the display unit 36 displays that the remaining amount of paper P is low.

Furthermore, when the rotation angle θ of the rotation arm 61 is θ3×θ, the light from the light emitting element of the photosensor 68 passes through the third slit 65 of the slit plate 64, and the photosensor 68
is in the ON state of 34■ and the paper empty sensor 77 is turned on, as shown in FIG. 8(d).
The display unit 36 displays that there is no paper P left m.

As described above, since the remaining amount of paper P is detected by detecting the amount of rotation (inclination) of the rotating arm 61, the rotating arm 61 can be used as a component of the detection means for Jb.
The number of parts can be reduced and costs can be reduced.

C. Effects of the Invention As explained above, according to the present invention, since the rotary member is also used as the f stage for detecting the remaining amount of paper, the number of parts can be reduced, the structure can be simplified, and costs can be reduced. This has this effect.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view showing a paper feeding device, FIG. 2 is a configuration diagram showing the inside of an electronic copying machine, Figure 4 is a plan view showing the operation section, Figure 5 is a side view showing the paper feeder, Figure 6 is a graph showing the tilt of the rotating arm and the on/off operation of the detector, and Figure 7 is the paper feeder. FIG. 8, which is an explanatory diagram showing the operation, is a plan view showing a display unit that displays the remaining amount of paper. P...Paper, 22.23...Paper cassette, 25.
... Take-out roller, 61... Rotating arm (rotating member)
68...Photo sensor (detector).

Claims (1)

[Claims] A paper feed cassette that stores paper, a take-out roller that takes out the paper in the paper feed cassette, a rotating member that moves the take-out roller in a direction in which it comes into contact with the paper each time the take-out roller takes out the paper, and A paper feeding device comprising: a detector that detects the remaining amount of paper by detecting the amount of rotation of a moving member.