JPH02310223A - Paper feeder and image former - Google Patents

Abstract

PURPOSE:To prevent a sheet of paper afterward the second one from getting out of a separate claw by installing a multiple sheetlike elastic multiple takeout preventing member, regulating a bulge quantity of the paper at time of its takeout and keeping off any multiple takeout, in a turning shaft fitted with a paper feeding means. CONSTITUTION:At time of paper feeding, a clutch installed in one end side of a paper feed roller shaft 57 works and this paper feed roller shaft 57 rotates one time. Then, paper P is fed out by frictional force through contact between a circular delivery part 36a and the paper P with the rotation of this paper feed roller 36. At this time, not only the paper P at an uppermost part but also the paper P after the second one are tried to be taken out by contact frictional force lying between sheets of paper themselves so that no only the paper P at the uppermost part but the paper after the second one are largely bulged and try to ride over a separate claw 51, but a bulge quantity in and around this separate claw 51 is regulated to the specified one because a sheetlike elastic part 58b of a multiple takeout preventing member 58 comes into contact with the paper P. With this regulation, only the paper P at the uppermost part is taken out of the paper feed roller 36.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a paper feeding device that takes out and supplies stacked sheets one by one, and more specifically, An image of a paper feed device that takes out sheets from a storage means such as a paper feed cassette in which sheets are held in a state of being held down by separation claws using a paper feed means such as a half-row paper feed roller, and an electronic copying machine equipped with the same. The present invention relates to a forming device.

(Prior Art) In recent years, image forming apparatuses such as electronic copying machines have become widespread, and many desktop types are now in practical use.

Normally, in desktop electronic copying machines, there is a paper feed cassette that stores the paper with the corners of both ends pressed by separation claws, and the paper in this paper feed cassette is taken out using the friction force. A paper feeding device including a paper feeding roller is used.

In addition, in most paper feeding devices of this type, the paper feeding cassette is installed with a portion of it protruding outside the main body of the device. The cassette cover except for the ejection port is closed.

Conventionally, in this type of paper feeding device, in order to reliably take out one sheet of paper, a resin presser sheet is attached to the cassette cover, and the amount of swelling of the paper between the separating claws that occurs at the time of taking out one sheet is controlled. is regulated by the presser sheet.

(Problem to be Solved by the Invention) However, in recent years, in order to reduce the size and cost of devices, image forming techniques have been developed in which the entire paper feed cassette is housed within the device body and the cassette cover is eliminated. Devices are being developed, but if the cassette cover is removed, the swell of the paper between the separation claws cannot be controlled during ejection, making it impossible to reliably take out a single sheet, and multiple sheets cannot be taken out at the same time. There are serious problems such as being lost.

The present invention has been made based on the above circumstances, and its purpose is to reduce the amount of expansion of paper between the separating claws when taking it out, while having a structure that eliminates the cover of the storage means such as a cassette cover. It is an object of the present invention to provide a paper feeding device that can be reliably regulated and can reliably take out one sheet, and an image forming apparatus equipped with the same.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides, as a first means for achieving the above object, a storage means for storing sheets with both end corners in the take-out direction being pressed by separation claws; A half-moon-shaped paper feeding means, which is provided facing the paper in the storage means and has an arcuate delivery portion that feeds the paper in contact with the paper, and an escape portion that does not come into contact with the paper; The sheet-shaped elastic member is provided on the rotating shaft and prevents multiple take-out by regulating the amount of expansion of the paper during take-out, thereby preventing multiple take-outs.

In addition, as a second means, there is a storage means that stores the paper with both end corners in the take-out direction being pressed by separation claws, and a storage means that is provided facing the paper in the storage means and that is in contact with the paper. a half-moon-shaped paper feeding means having an arc-shaped sending part that sends out the paper and a relief part that does not come into contact with the paper;
A sheet-like elastic body is provided at a position corresponding to the vicinity of the separation claw of the rotating shaft to which this paper feeding means is attached, and prevents multiple ejection by regulating the amount of expansion of the paper near the separation claw during ejection. This configuration includes a removal prevention member.

Further, as a third means, there is a storage means for storing the paper with the corners of both ends in the take-out direction being pressed by separating claws, and a storage means provided facing the paper in the storage means and in contact with the paper. A half-moon-shaped paper feeding means has an arcuate delivery section that sends out paper and a relief part that does not come into contact with the paper, and a rotating shaft to which this paper feeding means is attached is installed to control the amount of expansion of the paper when taking it out. The paper feeding device is provided with a sheet-like elastic member for preventing multiple take-outs by restricting multiple take-outs.

(Function) That is, according to the first means of the present invention, the multiple removal prevention member provided on the rotating shaft prevents the paper from expanding more than necessary when taking out the paper, and the second and subsequent sheets from the separating claw are prevented from expanding more than necessary. This prevents the paper from coming off. This prevents multiple take-outs and enables reliable single-sheet take-out 7. Also,
Since the multiple removal prevention member is formed in almost the same plane as the relief part of the paper feeding means that does not come into contact with the paper, and rotates together with the paper feeding means, it does not interfere with the insertion and removal of the storage means. do not have.

According to the second means, in addition to the effect of the first means, since the multiple removal prevention member is provided at a position corresponding to the vicinity of the separation claw, the amount of swelling of the paper near the separation claw can be reduced. can be regulated, and the separation effect can be obtained in a more stable state.

Further, according to the third means, it is possible to reliably take out one sheet of paper from the storage means and to easily insert and remove the storage means, thereby making it possible to improve reliability and operability during image formation.

(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Figure 2 shows the internal structure of the entire device, and Figure 3 shows the document holding cover in an open state. An image forming process configuration means 2 is built in, and an original platen (hereinafter referred to as a platen glass) 3 on which an original plate is set is provided on the upper surface.

Further, a document holding cover 4 is attached to the rear edge of the apparatus main body 1 to press down a document set on the platen glass 3, and a copy key 5, a copy key 5, An operation panel 9 on which a clear/stop key 6, a numeric keypad 7, a display section 8, etc. are arranged is arranged.

Furthermore, a front cover 10 that can be opened and closed is provided on the front of the apparatus main body 1, and a storage means for storing paper P such as plain paper to be supplied to the image forming process configuration means 2 is provided at the lower part of the front. A paper feed cassette (hereinafter simply referred to as a cassette) 11 is inserted. Further, on the left side of the main body 1 of the apparatus, a tray 12 for collecting fixed sheets P and a power switch 13 are provided.

The image forming process configuration means 2 has the following configuration. That is, a drum-shaped photoreceptor 20 serving as an image carrier is arranged approximately at the center of the apparatus main body 1.
Around this photoreceptor 20, along the rotation direction thereof, a charging device 21, an exposure section 20a1 of an exposure device 22, a developing device 2, etc.
3. Pre-transfer static eliminator 24, transfer device 25, peeling device 26
, a cleaning device 27, a static eliminator 28, and the like are arranged in this order.

Further, inside the apparatus main body 1, paper P1 automatically fed from the cassette 11 or paper P manually fed via the manual paper feed table 29 is transferred between the photoreceptor 20 and the transfer device 25. A paper transport path 31 is formed which leads to the tray 12 provided on the left side of the apparatus main body 1 via an image transfer section 30 between the two.

A pair of registration rollers 32 is arranged on the upstream side of the image transfer section 30 of the paper conveyance path 31, and a fixing device 3 is arranged on the downstream side.
3 and a pair of paper ejection rollers 34 are arranged. Further, a conveyor belt unit 35 is disposed between the peeling device 26 and the fixing device 33.

Also, one sheet of paper P is placed near the top of the cassette 11.
A paper feed roller 36 serves as a paper feed means for taking out sheets one by one, and the paper P taken out through the paper feed roller 36 is received and sent into a first branch transport path that forms the upstream side of the paper transport path 31. A pair of transport rollers 37 is provided. Furthermore, a manual feeding feed roller 38 is disposed at the confluence of the first branched conveyance path and the second branched conveyance path for manual feeding.

Further, the apparatus main body 1 is divided into two parts, an upper unit IA and a lower unit IB, with the paper conveyance path 31 as a border, and a support shaft 40 provided on the paper feed side as necessary. The upper unit IA can be opened approximately 25 degrees using the upper unit IA as a pivot point. The support shaft 40
is composed of a shaft portion of a torsion bar that constantly biases the upper unit IA in the direction of opening.

Further, in FIG. 2, numeral 41 is a cooling fan disposed at the top of the fixing device, and numeral 42 is a manual feed guide that guides the paper that is manually fed. 43 is a high-voltage transformer, and 44 is a scale that serves as a reference for setting an original.

Further, FIG. m4 shows the paper feeding device 50, which has a configuration including a cassette 11 and paper feeding rollers 36, 36 for feeding out the paper P in the cassette 11. The cassette 11 accommodates the paper P in a state in which the corner portions of both ends in the take-out direction are pressed by separation claws 51 . The rear end is supported by a movable guide member 52,52 connected to the rear end and a replaceable rear end support plate 53. Also,
A push-up spring 54.
54 and a weaker push-up spring 55, there is provided a receiving plate 56 that is constantly lifted up, and the uppermost sheet P is always pushed up to a position suitable for taking out.

Further, the paper feed rollers 36.36 are similar to those shown in FIGS.
As shown in the figure, it has a half-moon shape with an arcuate delivery section 36a that contacts the paper P and sends out the paper P, and an escape section 36b that is a flat notch that does not come into contact with the paper P. Further, when stopped, the relief portion 36b is located on the lower surface, and the cassette 11 is moved in a direction perpendicular to the direction of taking out the paper P (direction of arrow A in FIG. 4) without lifting the paper feed roller 36. It can be inserted and removed in the direction of the arrow in Figure 4.

In addition, as shown in FIGS. 1 and 4, the paper feed roller 3
6 and 36 are attached as the rotation shaft.
A multiple extraction prevention member 58 is attached to each of the paper feed rollers 7 and 7, located outside the paper feed roller 36 and above the separation claw 51. These multiple take-out prevention members 58, 58 include a sheet-like elastic part 58b formed in almost the same plane as the relief part 36b of the paper feed roller 36 that does not come into contact with the paper, and a sheet-like elastic part 58b that is connected to the paper feed roller axis. 57, and when stopped, the sheet-like elastic part 58b is located on the lower side and almost parallel to the sheet surface, similar to the escape part 36b of the paper feed roller 36.36. installed on. Moreover, it does not interfere with the insertion and removal of the cassette 11.

In addition, when feeding paper, a clutch (not shown) provided at one end side of the paper feed roller shaft 57 works, and the paper feed roller shaft 57
7 rotates once. Then, due to the contact between the arcuate delivery portions 36a, 36a and the paper P as the paper feed rollers 36, 36 rotate, the paper P is sent out by frictional force.

At this time, not only the topmost sheet P but also the second and subsequent sheets of paper P are being taken out due to the contact friction between the sheets, and not only the topmost sheet of paper P but also the second and subsequent sheets of paper P are being taken out as shown in FIG. As shown in middle a, the paper swells greatly and tries to get over the separation claws 51.51, but the sheet-like elastic portion 58b of the multiple extraction prevention member 58.58 comes into contact with the paper P, causing the paper P to swell near the separation claws 51.51. The amount of swelling is regulated to the extent already shown in FIG. As a result, since the frictional force between the second and subsequent sheets of paper P with the topmost sheet of paper P is not so large, the corner portions at both ends thereof cannot overcome the separation claws 51 and 51, and the topmost sheet of paper P Only the paper P is taken out due to the frictional force with the paper feed roller 36.

It goes without saying that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways without departing from the gist.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

In the paper feeding device according to the first aspect, the multiple removal prevention member provided on the rotating shaft prevents the paper from expanding more than necessary when taking out the paper, thereby preventing the second and subsequent sheets from coming off from the separating claw. Even though the cover of the storage means is eliminated, one sheet can be taken out reliably. In addition, since the multiple removal prevention member is formed in almost the same plane as the relief part of the paper feeding means that does not come into contact with the paper, and rotates relative to the paper feeding means, there is no possibility that it will interfere with the insertion and removal of the storage means. There is no.

In addition to the effect of the first aspect, in the paper feeding device of the second aspect, since the amount of swelling of the paper in the vicinity of the separating claw can be regulated, the separating effect can be obtained in a more stable state.

Further, in the image forming apparatus according to the third aspect, it is possible to reliably take out one sheet from the storage means and to easily insert and remove the storage means, thereby improving reliability and operability during image formation.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a schematic perspective view of the main parts, Fig. 2 is a schematic vertical sectional front view of the entire image forming apparatus, and Fig. 3 is a document holding cover opened. FIG. 4 is a schematic plan view of the paper feeding device, and FIG. 5 is an explanatory diagram showing the state when paper is taken out. DESCRIPTION OF SYMBOLS 11... Accommodating means (paper feeding cassette), 36... Paper feeding means (paper feeding roller), 36a... Arc-shaped sending part, 36
b... Escape part, 50... Paper feeding device, 51... Separation claw, 57... Rotating shaft (paper feeding roller shaft), 58... Multiple extraction prevention member, P... Paper . Applicant Agent Nori Chika Yamashita Butsuma - Figure 1 Figure 3

Claims (3)

[Claims] (1) A storage means that stores the paper with the corner portions at both ends in the take-out direction pressed by separation claws, and is provided facing the paper in the storage means and feeds the paper by contacting the paper. A half-moon-shaped paper feeding means having an arcuate delivery part and a relief part that does not come into contact with the paper, and a rotating shaft to which this paper feeding means is attached, are provided to regulate the amount of expansion of the paper when taking out the paper. A paper feeding device comprising a multiple take-out prevention member made of a sheet-like elastic body that prevents take-out. (2) A storage means that stores the paper with the corner portions at both ends in the take-out direction being pressed by separation claws, and is provided facing the paper in the storage means and feeds the paper by coming into contact with the paper. A half-moon-shaped paper feeding means having an arcuate delivery part and an escape part that does not come into contact with the paper, and a rotating shaft to which this paper feeding means is attached, which is provided at a position corresponding to the vicinity of the separation claw and near the separation claw when taking out the paper. A paper feeding device comprising: a sheet-like elastic member for preventing multiple take-outs by regulating the amount of expansion of paper sheets; and a member for preventing multiple take-outs. (3) A storage means that stores the paper with the corners of both ends in the take-out direction being pressed by separation claws, and a storage means that is provided facing the paper in the paper feed means and that feeds the paper by coming into contact with the paper. A half-moon-shaped paper feeding means having an arcuate delivery part and a relief part that does not come into contact with the paper, and a rotating shaft to which this paper feeding means is attached regulates the amount of expansion of the paper when taking out the paper. An image forming apparatus comprising a sheet feeding device having a sheet-like elastic member for preventing multiple take-outs.