JPH07291476A - Paper feeding device - Google Patents

Abstract

PURPOSE:To make effective grounding, convey sheets of paper smoothly, and reduce the manufacturing costs by forming a spring to press a pressure contact part resiliently to the mating part from an electrically conductive spring material, furnishing a grounding part, and making the pressing part and a contact piece in contact with the grounding part in a consolidated structure. CONSTITUTION:A spring 91 is made from an electrically conductive spring leaf in a single-piece structure through a punch-off process, and the slide contact surfaces 67b near the two end faces of a while roller 67 are put in pressure contact by a pressing piece 96, and the roller 67 is pressed resiliently to the reading part 52. Pressing pieces 112, 113 of a center spring mechanism 93 puts the shaft 82 of each pinch roller 81 in contact so that pinch rollers 81 are pressed resiliently to a conveying roller of a lower unit 41. The white roller 67, etc., made of resin is likely to bear electrostatic charge, which can however be discharged to the ground through the spring 91, a shaft 88, hook 89a. Thereby sheets of paper can be conveyed smoothly while the pressure contact part is prevented from rattling and electrostatic charge is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device used in a transmission section for reading a transmission original of a facsimile machine, for example.

[0002]

2. Description of the Related Art Conventionally, for example, a paper feeding device shown in FIGS. 6 and 7 is known. This paper feeding device constitutes a transmission unit for reading a transmission original of a facsimile apparatus, and includes a lower unit 2 having a reading unit 1 for reading the original.
And a white roller 3 facing the reading unit 1, an upper unit 4 covering the lower unit 2, and the like. A document passage 5 for transmitting a transmission document is formed between the lower unit 2 and the upper unit 4, and the transmission document conveyed in the document passage 5 is pressed by the white roller 3 to be read by the reading unit 1. The reading unit 1 reads the image in a state in which the reading unit 1 is in close contact with.

The lower unit 2 has a side frame 2a made of a metal plate or the like on one side and a gear frame unit 2b on the other side.

The upper unit 4 has an operation panel such as a keyboard attached to its upper surface and has an upper unit body 4a made of resin. And
One end of the upper unit body 4a is connected to the lower unit 2 by a pair of screws 6a serving as a rotating shaft and a screw 6b for restricting a rotation range, and is supported so as to be openable and closable. Also, the shaft 7 is attached to the other end of the upper unit body 4a.
Is rotatably supported, and is hooked to and retained by the lower unit 2 in a detachable manner by resin hooks 8 fixed to both ends of the shaft 7.

Further, in the upper unit 4, a central spring 11 located at the center and side springs 12 and 13 located on both sides of the central spring 11 are respectively screwed.
It is fixed by 14. Further, the four pressing portions 11a are bent and formed on the central spring 11, and
Each side spring 12 and 13 has one pressing portion 12a.
, 13a are bent, and these pressing portions 11a, 1a are
The white roller 3 is elastically pushed downward by 2a and 13a, and is supported so as not to rattle in the vertical direction.

The white roller 3 is made of rubber or resin, and static electricity generated when the paper is conveyed between the white roller 3 and the reading section 1 is easily charged. Therefore, the central spring 11 and the side spring 12 on one side are electrically connected by the first ground cable 15 which is fastened together with the screw 14, and the side spring 12 on the one side and the lower unit are connected. The second side frame 2a is electrically connected with the second ground cable 16 which is fastened together with the screws 6b and 14, so that static electricity charged on the white roller 3 can be removed (grounding). There is.

[0007]

However, in the above-mentioned conventional structure, in order to remove the static electricity charged on the white roller 3, the springs 11 and 12 for pressing the white roller 3 to prevent rattling are connected. Therefore, a plurality of ground cables 15 and 16 are required, and there is a problem that the manufacturing cost is increased due to an increase in the number of parts and an increase in the number of work steps. Further, in the above conventional configuration, the ground cable is not connected to the side spring 13 on the other side,
Connecting the ground cable to the side spring 13 has a problem that the number of parts is further increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a paper feeding device capable of effectively grounding and smoothly carrying a paper and reducing the manufacturing cost.

[0009]

The paper feeding device of the present invention comprises:
The press-contact portion facing the press-contact portion, the spring body that elastically presses the press-contact portion toward the press-contact portion side, and the ground portion are provided, and the sheet is conveyed between the press-contact portion and the press-contact portion. In the paper feeding device, the spring body is made of a conductive spring material, and a pressing portion that comes into contact with the roller and elastically presses it, and a contact piece that comes into contact with the ground portion are integrally formed. It was formed.

[0010]

In the paper feeding apparatus of the present invention, the pressure contact portion is elastically pressed toward the pressure contact portion side by the spring body, and rattling of the pressure contact portion is prevented. The static electricity generated when the paper is conveyed is grounded from the pressing portion of the spring body to the grounding portion through the contact piece, and the charging of the pressure contact portion is suppressed. There is no need for a separate wire material for grounding.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment of the paper feeding apparatus of the present invention will be described below with reference to the drawings.

In FIGS. 4 and 5, reference numeral 21 denotes a facsimile machine, which has a case body 22 constituting an outer shell. Then, inside the case body 22, there is provided a cassette mounting portion 23 which is open to the front side, and a paper feeding cassette 24 serving as a paper feeding portion can be removably mounted in the cassette mounting portion 23. ing. Further, an electrophotographic printing unit 26 which constitutes a printing unit, a fixing unit 27 which also constitutes a printing unit, a transmission unit 28 and the like are housed above the paper feeding cassette 24.

Then, the sheets (recording sheets) such as A4 stacked in the sheet feeding cassette 24 are separated and fed one by one into the recording sheet passage 31 formed so as to make a U-turn, and the printing unit 26 is set. The toner image is transferred from the photosensitive drum when passing, and the toner image is heat-fixed when passing through the fixing unit 27 and is discharged to the recording paper discharge port 33 side opened on the front surface of the case body 22. Has become.

An operation panel 35 having a keyboard 35a, a liquid crystal display 35b and the like is provided on the upper surface of the case body 22, and the transmission original is placed on the rear side of the operation panel 35. An upper cover 36 is provided which forms an inclined document table 36a for setting. Further, on one side of the case body 22, a mounting portion 37 on which a receiver (not shown) is mounted is formed.

As shown in FIGS. 1 to 4, the transmission unit 28 includes a lower unit 41 and a lower unit 41.
It has an upper unit 42 attached to the upper side of 41, and these units 41, 42 constitute a paper feeding device 44. Further, the transmission unit 28 is provided with a document insertion portion 45 having an opening on the upper surface in a continuous manner with the document table 36a, and is also opened on the front surface of the case body 22 and has a document ejection port 46.
Is provided. A document passage 48 is provided on the mating surface of the upper and lower units 41, 42 so as to communicate with the document discharge port 46 from the document insertion portion 45 and convey the transmission document.

The lower unit 41 is called a TR frame unit, and is composed of a lower frame 51 made of resin or the like, a reading unit 52 to be a pressed portion, a gear frame unit 53 and the like. Has been done.

The lower frame 51 also includes a lower plate portion 54 constituting the lower surface of the document passage 48, leg pieces 55a and 55b formed on both sides of the lower plate portion 54, and one leg piece 55a. The gear mounting portion 56 extending outward is integrally formed of, for example, synthetic resin. The reading unit 52 is a so-called compact image sensor (CIS), and is adapted to read a transmission document which is an object to be read and is in close contact with the reading surface 52a formed on the upper surface.

The reading unit 52 has a lower plate portion in the longitudinal direction.
The reading surface 52a is attached to the lower plate portion 54 so that the reading surface 52a is substantially flush with the surface portion of the lower plate portion 54. further,
The lower plate portion 54 is formed in front of and behind the reading portion 52, and has a pair of through holes 58a and 58b formed on both sides thereof, and transport rollers (not shown) are respectively arranged in the through holes 58a and 58b. In addition, the lower plate portion 54 is formed with a pull-in roller through hole 59 which is located on the rear side of the rear through hole 58b and whose longitudinal direction is the width direction.
An unillustrated pull-in roller is arranged in the pull-in roller through hole 59. Also, this lower frame 51
Bearings 61a, 62a are formed on both sides of the reading unit 52. And the gear frame unit 53,
It has a metal gear frame 64, and this gear frame 64
Further, a plurality of gears 65 and a motor 66 that rotationally drives these gears 65 are attached.

Further, facing the reading surface 52a of the reading section 52,
A white roller 67 is arranged as a press contact portion. The white roller 67 has a roller main body 67a having a white outer peripheral surface made of resin such as polyacetal or rubber, and both ends of the roller main body 67a are slidably contacted with each other having a smaller diameter than the roller main body 67a. The portion 67b is formed. Further, adjacent to the sliding contact portion 67b, there is provided a shaft support portion 68 that is detachably fitted to the bearing portions 61a and 62a of the lower frame 51, and a support portion 69 provided with a knob portion 69a is provided. It is provided so that the white roller 67 can be removed upward by gripping the knob portion 69a as required. Further, a resin gear 70 is provided at one end of the white roller 67 so as to mesh with a gear 65 provided in the gear frame unit 53 of the lower unit 41.

On the other hand, the upper unit 42 has an upper frame 71 made of resin also called a keyboard frame, and an operation panel 35 also called a keyboard unit is screwed onto the upper surface of the upper frame 71. Then, on the upper frame 71, an upper plate portion 72 that constitutes the upper surface of the document passage 48, a peripheral plate portion 73 that protrudes upward from the peripheral portion of the upper plate portion 72, and the upper plate portion 72 of the upper plate portion 72. A rib portion 74 having a substantially lattice shape protrudingly provided on the upper surface is integrally formed of resin such as polycarbonate. In addition, in this upper plate portion 72,
A substantially arc-shaped cover portion 76 that covers the white roller 67 is formed, and is located in front of and behind the cover portion 76,
Pinch roller mounting portions 77a and 77b are formed. Each of the pinch roller mounting portions 77a and 77b is formed with a shaft supporting portion 78 which is provided in front and back in a pair so as to project, and a through hole 79 which is opened at both sides of the shaft supporting portion 78. . A pinch roller 81 for conveying a document is arranged in each through hole 79, and a support shaft 82 connecting the pinch rollers 81 on both sides is supported by a shaft support 78 so as to be rotatable and vertically movable. There is. Further, a separation pad attachment portion 84 is formed on the rear side of the rear side pinch roller attachment portion 77b, and a separation pad for separating a transmission document is attached to the lower side portion of the separation pad attachment portion 84. There is. The separation pad is brought into sliding contact with the pull-in roller of the lower unit 41, and as the pull-in roller rotates, the transmission originals stacked on the original table 36a are separated one by one and drawn into the original passage 48. There is.

A pair of mounting pieces 86 on both sides are provided on the lower front side of the upper unit 42.
Using the through hole 86a formed in 86 as a fulcrum, the upper unit 42
Is rotatably supported by the lower unit 41, and the document passage 48 can be opened and closed. A shaft 88 as a grounding portion is arranged on the upper surface of the upper unit 42 near the rear end portion of the upper frame 71. This shaft 88
Is in the form of a conductive metal rod, and both ends thereof are rotatably supported by the peripheral plate portion 73 of the upper frame 71. Further, hooks 89a, 89b made of metal such as sheet metal are fixed to both ends of the shaft 88, which are located outside the peripheral plate 73. By engaging the hooks 89a and 89b with the lower unit 41, the upper unit 42 is engaged and held. Especially one side hook
89a is engaged with the stud portion 64a formed on the metal gear frame 64 of the gear frame unit 53, and the shaft 88 and the gear frame unit 53 are engaged via the hook 89a.
And are electrically connected.

On the upper surface side of the upper frame 71, spring members 91, 91 for pressing the white roller 67 are attached in pairs on both sides, and are located at the center of the spring members 91, 91. Pinch roller 81
A central spring mechanism 93 for pressing the support shaft 82 is attached.

Each spring body 91 is also called a CIS spring and is integrally formed by punching out and bending a conductive spring plate. Each spring body 91 has a base plate portion 95 having a substantially L shape in a plane.
The base plate portion 95 has a first locking hole 95a and a second locking hole 95b. In addition, from one end of the substrate portion 95, a pressing piece 96 as a pressing portion having an elongated rectangular shape is formed.
Are extended in the same plane as the substrate portion 95. Further, from the other end of the substrate portion 95, a contact piece 97 bent upward in an approximately L-shaped cross section is provided.

Then, these spring bodies 91 are
The first locking hole 95a formed in 95 is engaged with the hook-shaped first locking projection 101 provided on the upper surface of the upper frame 71, and the second locking hole 95b is formed on the upper surface of the upper frame 71. It engages with the protruding second locking protrusion 102 and is engaged and held by the upper frame 71.

Further, the pressing pieces 96 of each spring body 91 are inserted through the insertion portions 76a formed at both ends of the cover portion 76 which covers the white roller 67, and are positioned in front of and behind the insertion portion 76a to form the upper frame. The engaging hole 105 of the engaging piece 104 formed on the 71 is inserted. Then, in this state, the pressing piece
96 is locked to each locking piece 104 and is pressed against sliding contact surfaces 67b provided in the vicinity of both ends of the white roller 67, and the white roller 67 is elastically pressed to the lower side, that is, the reading section 52 side. is doing.

Further, the contact piece 97 of each spring body 91 is
The lower surface of the shaft 88 pivotally supported by the upper frame 71 is elastically pressed into sliding contact with the lower surface of the shaft body 91 and the shaft.
88 is in an electrically connected state.

Further, as shown in FIG. 1, the central spring mechanism 93 includes a connecting piece portion 111 made of sheet metal and a connecting piece portion.
Plural pressing pieces 11 connected to or integrally formed with 111
It consists of 2, 113 and so on. Then, the central spring mechanism 93 has a locking hole 11 formed in the connecting piece 111.
1a is attached to the upper frame 71 by engaging the central engaging portion 114 provided on the upper frame 71 in a protruding manner. Further, a contact piece portion 116 bent upward is extended from a rear end portion of the connection piece portion 111.

The pressing pieces 112 and 113 of the central spring mechanism 93 contact the support shafts 82 of the pinch rollers 81 and press the support shafts 82 downward, so that the pinch rollers 81 are conveyed to the lower unit 41. The roller is elastically pressed.

In this way, in the transmission unit 28, by driving the gear frame unit 53, the original table 36a
The transmission originals as sheets stacked on the sheet are drawn into the original passage 48 while being separated one by one by the paper feeding device including the separation pad and the drawing roller, and the original discharge port 46 is provided between the pinch roller 81 and the conveying roller. Be transported to. Then, when passing between the reading unit 52 and the white roller 67, the transmission document that is brought into close contact with the reading surface 52a by the white roller 67 is read by the reading unit 52.

According to this embodiment, the spring body is
Since the white roller 67 is elastically pressed against the reading unit 52 side by 91, the rattling of the white roller 67 can be suppressed, and the central spring mechanism 93 enables each pinch roller 81.
Since the sheet is elastically pressed toward the conveying roller side, rattling of each pinch roller 81 can be suppressed, the transmitted original can be accurately conveyed, and the quality of original reading can be improved.

The static electricity generated when the transmitted document is separated or conveyed is the white roller 67 made of resin.
However, the white roller 67 is in sliding contact with the pressing piece 96 of each spring body 91, and the contact pieces 97 of these spring bodies 91 are in contact with the shaft 88. A metal gear frame that serves as an earth ground by using the hooks 89a and 89b of the shaft 88 as metal.
Since they are engaged with 64, these spring body 91, shaft
88, and white roller via hooks 89a and 89b
67 can be grounded. Therefore, it is possible to suppress the charging of the white roller 67 and to smoothly convey the transmission document.
Similarly, the central spring mechanism 93 can suppress the charging of the support shaft 82 of the pinch roller 81.

Further, since the white roller 67 can be grounded by the spring body 91 which is a member for pressing the white roller 67, the shaft 88 and the hooks 89a and 89b which are members for engaging and holding the upper unit 42, the white roller 67 can be grounded conventionally. It is possible to reduce the number of parts such as the ground cable, and reduce the number of parts to reduce the manufacturing cost. Also,
Since each spring body 91 can be easily attached by engagement, members such as screws can be eliminated, the number of parts can be reduced, the assembly can be facilitated, and the manufacturing cost can be reduced. Further, the spring body 91 has a pressing piece 96.
Since it has a flat plate shape and is locked by the pair of locking pieces 104 of the upper frame 71, the complicated bending process can be reduced without lowering the pressing force against the white roller 67, and the manufacturing cost can be reduced by simplifying the shape of parts. It can be reduced.

[0033]

According to the paper feeding device of the present invention, since the pressure contact portion is elastically pressed toward the pressure contact portion side by the spring body, it is possible to prevent the pressure contact portion from rattling. Since the static electricity generated when the paper is conveyed can be grounded from the pressing portion of the spring body to the grounding portion through the contact piece, it is possible to suppress the charging of the pressure contact portion and smoothly convey the paper. Since a wire member or the like that is a separate member is not required for grounding, the number of parts can be reduced and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a paper feeding device of the present invention.

FIG. 2 is an exploded perspective view of a part of the same paper feeding device.

FIG. 3 is a cross-sectional view of a part of the same paper feeding device.

FIG. 4 is a configuration diagram of a facsimile device using the same paper feeding device.

FIG. 5 is a perspective view of a facsimile device using the same paper feeding device.

FIG. 6 is an exploded perspective view showing a part of a conventional paper feeding device.

FIG. 7 is an exploded perspective view showing the same paper feeding device.

[Explanation of symbols]

 44 Paper feeder 52 Scanning part as pressed part 67 White roller as pressure contact part 88 Shaft as ground contact part 91 Spring body 96 Pressing piece as pressing part 97 Contact piece

Claims (1)

[Claims] 1. A pressure contact portion facing the pressure contact portion, a spring body that elastically presses the pressure contact portion toward the pressure contact portion side, and a ground portion, the pressure contact portion and the pressure contact portion. A paper feeding device in which paper is conveyed between, wherein the spring body is made of a conductive spring material,
A paper feeding device, wherein a pressing portion that comes into contact with the pressure contact portion and elastically presses is integrally formed with a contact piece that comes into contact with the ground contact portion.