JPH0629120B2 - Copy paper transport mechanism in the discharge section of the double-sided copying machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a copy paper transport mechanism, and more particularly to a copy paper transport mechanism applied to a discharge section of a double-sided copying apparatus.

<Background Art> In recent years, with the diversification of copying, a so-called double-sided copying apparatus capable of performing copying on both sides of copy paper has been proposed and put into practical use. In such a double-sided copying machine, a copy sheet is conveyed through a predetermined copy sheet conveying path defined by a copy sheet conveying means, and one side of the copy sheet is copied during the conveyance. Then, in the case of single-sided copying, the copy paper is ejected outside the housing as it is, while in the case of double-sided copying, the copy paper is guided to the reversing unit and then conveyed through the copy paper return conveyance path. The sheet is conveyed to the upstream side of the path, is then conveyed again through the copy sheet conveying path (the other surface is also copied during the conveyance), and is discharged to the outside of the housing.

The double-sided copying apparatus is provided with a copy sheet conveying mechanism for discharging the copy sheet at the discharge portion thereof, that is, on the downstream side of the fixing device because it is necessary to convey the copy sheet as described above. Various types of copy paper transporting mechanisms of this type have been proposed and put to practical use, but the applicant has filed Japanese Patent Application No. 59-201823 (name: temporary acceptance and reverse transfer for copy paper reversal of a copying machine). In the apparatus), an improved copy paper transport mechanism has been proposed which can transport copy paper as required with a relatively simple structure. Such an improved copy paper transport mechanism is provided with a first roller mounted on a first shaft member that is rotated in a predetermined direction, and a second roller mounted on a second shaft member and driven by the first roller. The second roller and the third shaft member are attached to the second roller.
A third roller movable between an operating position driven by the first roller and a non-operating position separated from the second roller. The first roller and the second roller are provided when the copy paper is discharged out of the housing. When the copy sheet is conveyed by the cooperative action of the rollers of the above, and the copy sheet is guided to the upstream side of the copy sheet conveying mechanism, it is guided to the copy sheet reversing section through the second roller and the third roller in the non-acting position, and then the second sheet. And the third roller placed in the operating position cooperate with each other to convey the copy paper to the upstream side of the conveying means.

However, in the copy paper transport mechanism, the first roller, which is a driving roller, is made of rubber, which is a material having a relatively high friction coefficient, and the second roller, which is a driven roller, is a material having a relatively low friction coefficient. When it is made of synthetic resin, when the copy paper is discharged out of the housing, the copy paper can be reliably conveyed as required, but the copy paper is conveyed toward the upstream side of the copy paper conveyance mechanism. Sometimes the second
Due to the fact that the rollers of
A slip occurs between the second roller and the copy paper, which makes the copy paper conveyance unstable. On the other hand, on the contrary, when the first roller, which is the driving roller, is made of synthetic resin and the second roller, which is the driven roller, is made of rubber, it is easy to understand that the copy paper is When the sheet is ejected to the outside of the housing, a slip occurs between the first roller and the copy sheet, and the copy sheet at that time becomes unstable.

Generally, to ensure that the copy paper is transported as required,
It is important that the roller, which acts as the drive roller, be made of a material having a relatively high coefficient of friction. In connection with this, it is conceivable that both the first roller and the second roller are made of rubber.
When the first roller and the second roller are in contact with each other, the rubbers come into direct contact with each other, and the life of the first roller and the second roller is remarkable due to the friction between the rubbers and the like. Become shorter.

<Objects of the Invention> The present invention has been made in view of the above facts, and its main purpose is to solve the above-mentioned inconveniences and to transfer a copy paper reliably as required, which is an excellent copy paper transfer. It is to provide a mechanism.

<Summary of the Invention> According to the present invention, a first shaft member that is disposed in a discharge portion of a double-sided copying apparatus and is rotated in a predetermined direction, and a first roller that is mounted on the first shaft member. A second shaft member arranged at a distance from the first shaft member, and a second roller attached to the second shaft member and driven by the first roller. A third roller mounted on the second shaft member and rotated by being driven by the second roller, an operating position acting on the third roller, and a non-operation separating from the third roller Pressing means movable between positions, the first roller and the third roller being formed of a material having a relatively high coefficient of friction and the second roller having a relatively low coefficient of friction. The copy paper is made of a material, and when the copy paper is guided to the outside of the housing, the copy paper is made of the first roller and the second roller. It is conveyed toward the outside of the housing by the action, and when it is guided to the upstream side of the copy sheet conveying means, it is guided to the copy sheet reversing section through the third roller and the fourth roller in the non-acting position. After the third
Is provided and is conveyed toward the upstream side of the copy sheet conveying means by the action of the roller and the pressing means set to the operating position.

<Preferred Specific Examples of the Invention> Hereinafter, with reference to the accompanying drawings, preferred specific examples of a copy sheet conveying mechanism configured according to the present invention will be described.

In FIG. 1 showing the discharge section of the double-sided copying apparatus, the illustrated copy paper transport mechanism 2 includes a first shaft member 4 disposed in the discharge section of the double-sided copying apparatus and above the first shaft member 4. It is provided with the 2nd axis member 6 arranged at intervals. Referring to FIG. 2 together with FIG. 1, the illustrated electrostatic copying machine has a shell-type support structure including a lower support frame body 10 and an upper support frame body 12 openably and closably mounted on the lower support frame body 10. When the upper support frame 12 is in the closed position (position shown in FIG. 2), the various components mounted on the lower support frame 10 and the various components mounted on the upper support frame 12 are in the first position. The positional relationship shown in FIGS. 1 and 2 is maintained. More specifically, the lower support frame 10 has a vertical front substrate 14 and a vertical rear substrate 16 which are arranged at intervals in the front-rear direction (direction perpendicular to the paper surface in FIG. 1, left-right direction in FIG. 2). The first shaft member 4 is rotatably mounted between the vertical front substrate 14 and the vertical rear substrate 16 via a bearing member 18. A plurality of (four in the specific example) first rollers 2 are arranged on the first shaft member 4 at intervals in the front-rear direction, and thus in the axial direction.
0 is installed. The rear end side of the first shaft member 4 penetrates the vertical rear substrate 16 of the lower support frame 10 and projects rearward, and a transmission member (not shown) such as a sprocket is attached to the rear end portion. . The transmission member is further drivingly connected to a main drive source (not shown) of the double-sided copying machine via a transmission member (not shown) such as a chain. Therefore,
When the main drive source operates, this drive is transmitted to the first shaft member 4 via the transmission member and the transmission member, and the first roller 2
0 is rotated in the direction indicated by arrow 22 (FIG. 1). As shown in FIG. 2, the first roller 20 described above defines a part of the copy paper transport path 24 for discharging the copy paper together with a second roller described later, and the width direction of the copy paper transport path 24 is defined. (That is, the direction perpendicular to the paper surface in FIG. 1 and the left-right direction in FIG. 2) are symmetrically arranged on both sides in the width direction with the central portion as the center. Each first roller 20 further includes
The protrusion 26 is provided at least at one end. In a specific example, the pair of first rollers 20 arranged on the inner side in the width direction has one outer end (the right end in the right roller 20 in FIG. 2 and the left roller 2 in FIG. 2).
At 0, the left end) has a ring-shaped protrusion 2 over the entire circumference.
6 is provided, and a pair of first members arranged outside the width direction.
The roller 20 is provided with annular protrusions 26 at both ends (both left and right ends in FIG. 2) over the entire circumference thereof. It is important that the first roller 20 having such a configuration is made of a material having a relatively high coefficient of friction, and it is particularly preferable that the first roller 20 is made of rubber such as synthetic rubber.

Further, the upper support frame 12 has a vertical front substrate 28 and a vertical substrate 30 which are arranged at intervals in the front-rear direction. L-shaped mounting pieces 32 and 34 are mounted on the inner surfaces of the vertical front substrate 28 and the vertical rear substrate 30 of the upper support frame 12, respectively, and a bearing member 36 is interposed between the lower ends of the mounting pieces 32 and 34. The second shaft member 36 is rotatably mounted. A plurality of second shaft members 6 are arranged at intervals in the front-rear direction corresponding to each of the first rollers 20 and thus in the axial direction thereof (in the specific example, four rollers are provided corresponding to the first rollers 20). ) Second roller 38 is mounted. Each of the second rollers 38 contacts the peripheral surface of the corresponding first roller 20 when the upper support frame 12 is in the closed position, and
As the roller 20 rotates in the direction indicated by the arrow 22, the roller 20 is driven in the direction indicated by the arrow 40 (FIG. 1). In the specific example,
The length of the second roller 40 in the width direction is shorter than the length of the first roller 20 in the width direction, and the pair of second rollers 38 arranged on the inner side in the width direction of the copy paper transport path 24 correspond to each other. The pair of second rollers 38, which are brought into contact with the first roller 20 slightly inward of the widthwise central portion thereof and are arranged on the widthwise outer side thereof, are the protrusions 2 of the corresponding first roller 20.
There are some gaps between the second roller 38 and the corresponding protrusion 26 of the first roller 20, which is brought into contact with the central portion between the rollers 6. It is important that the second roller 38 having such a structure is made of a material having a relatively low coefficient of friction, and it is particularly preferable that the second roller 38 is made of a synthetic resin such as polyacetal.

The second shaft member 6 described above is further mounted with a third roller 42. In the specific example, the copy paper transport path 2
4 between the pair of second rollers 38 arranged on the front side in the width direction (right side in FIG. 2) and on the rear side in the width direction (second side).
A pair of second rollers 38 disposed on the left side in the drawing)
The third roller 42 is disposed between them. And
In the specific example, the second roller 38 and the third roller 42 described above are used.
As shown in FIG. 2, they are symmetrically arranged on both sides in the width direction with respect to the center in the width direction of the copy paper transport path 24. The third roller 42 has an outer diameter substantially equal to that of the second roller 38, and similarly rotates in the direction indicated by the arrow 40 (FIG. 1) as the second roller 38 is driven. Be moved. It is important that the third roller 42 is formed of a material having a relatively high coefficient of friction, and it is particularly preferable that the third roller 42 be formed of rubber such as synthetic rubber.

A pressing unit is provided in association with the third roller 42 described above. The pressing means shown in the figure is composed of a fourth roller 62 mounted on the third shaft member 8, and the third shaft member 8 is movable between the vertical front substrate 28 and the vertical rear substrate 30 of the upper support frame 12. Is attached to. More specifically, pin members 44 and 46 are planted on the inner surfaces of the vertical front substrate 28 and the vertical rear substrate 30 of the upper support frame 12, and the lever members 48 and 50 are rotatably attached to the pin members 44 and 46. It is installed. A support shaft 52 is fixed between one ends of the lever members 48 and 50, and a pair of connecting members 54 and 56 is fixed at an intermediate portion of the support shaft 52 with a space therebetween. The third shaft member 8 is rotatably attached to the. Further, at the other end of the L-shaped lever member 50 mounted on the vertical rear substrate 30 of the upper support frame 12, the output end 58a of the electromagnetic solenoid 58 attached to the inner surface of the vertical rear substrate 30 is pinned. They are connected via 60. The third shaft member 8 mounted between the connecting members 54 and 56 constitutes a pressing member with a space in the front-rear direction, that is, in the axial direction corresponding to each of the third rollers 42. The fourth roller 62 is mounted. Therefore, when the electromagnetic solenoid 58 is energized,
The lever members 48 and 50 are rotated clockwise in FIG. 1, and the third shaft member 8 is also rotated clockwise in FIG. 1 about the pin members 44 and 46 via the support shaft 52 and the connecting members 54 and 56. And thus the fourth roller 62 is positioned in the working position shown in solid lines in FIG. 1 and in FIG. In such an operating position, the peripheral surface of the fourth roller 62 is pressed against the peripheral surface of the corresponding third roller 42, and thus the fourth roller 62 is moved by the third roller 38 to the arrow 64 (FIG. 1). Driven by the direction indicated by. On the other hand, when the electromagnetic solenoid 58 is deenergized, the lever members 48 and 50 are rotated counterclockwise in FIG. 1 by the action of a spring member (not shown), and the support shaft 52 and the connecting members 54 and 56 are used. The third shaft member 8 is also centered around the pin members 44 and 46.
It is swung counterclockwise in the figure and thus the fourth roller 62 is positioned in the non-acting position, which is indicated by the chain double-dashed line in FIG. In the non-acting position, the fourth roller 6
2 is separated from the corresponding third roller 42 and is not driven by the third roller 42. As shown in FIG. 2, the fourth roller 62 is the third roller 6 described above.
A part of the copy paper transport path 64 for feeding the copy paper back is defined together with 2. The fourth roller 62 is preferably made of synthetic resin such as polyacetal,
With this structure, the weight of the fourth roller 62 can be reduced, and the small electromagnetic solenoid 58 can move the fourth roller 62 as required.

Referring to FIG. 1, a copy sheet switching / conveying mechanism 70 is arranged on the upstream side of the copy sheet conveying mechanism 2 as viewed in the copy sheet conveying direction indicated by arrow 68. The illustrated copy sheet switching / conveying mechanism 70 includes a conveying means 72 arranged on the upstream side in the copying paper conveying direction indicated by an arrow 68 and a downstream side thereof, that is, the conveying means 7.
2 and a switching unit 74 disposed between the copy paper transport mechanism 2 described above. The conveying means 72 shown in the figure is an arrow 76.
The roller 80 mounted on the shaft member 78 which is rotated in the direction shown by, the roller 84 mounted on the shaft member 82 rotatably arranged below the shaft member 78, and the roller 84 mounted above the shaft member 78. Roller 88 mounted on shaft member 86 arranged freely
Is equipped with. In the specific example, the rollers 80 and 84 are mounted on the lower support frame body 10, and the roller 88 is mounted on the upper support frame body 12. The roller 84 is brought into contact with the lower portion of the roller 80, and is driven in the direction indicated by the arrow 90 as the roller 80 rotates in the direction indicated by the arrow 76. The roller 88 is in contact with the upper portion of the roller 80, and is driven in the direction shown by the arrow 92 as the roller 80 rotates in the direction shown by the arrow 76. Laura 80
And 88 in relation to their upstream side a guide member 94.
And 96 are provided. One end sides of the guide members 94 and 96 extend to a lower roller and an upper roller of a fixing device (not shown). Also, in connection with rollers 80 and 84,
Conveying roller pairs 100 and 102 are provided on the downstream side in the copy paper returning direction indicated by the arrow 98. The pair of transport rollers 100 and 102 is a copy sheet transport unit for transporting a copy sheet on one side of which is described later (the copy sheet transport unit transports the copy sheet through the transfer area as required). Stipulates that) is conveyed to the upstream side. The rollers 80 and 84 and the conveying roller pair 100 and 1
Between 02, the other end side of the guide member 94 and the guide plate 10
4 is extended.

The illustrated switching means 74 includes a lower guide member 106 and an upper guide member 108 that are arranged at a distance from each other, and is configured so that the lower guide member 106 and the upper guide member 108 can move integrally. . In the specific example, the lower guide member 106 is fixed to a support shaft 110 that is rotatably mounted.
A connecting member 112 is fixed to the support shaft 110, and a tip portion of the connecting member 112 is connected to an output end 116 a of an electromagnetic solenoid 116 via a pin member 114. As described above, when the electromagnetic solenoid 116 is biased, the support shaft 110 is rotated in the clockwise direction in FIG. 1 via the connecting member 112, thus supporting the lower guide member 106 and the upper guide member 108. It is integrally rotated about the shaft 110 and positioned at the first position shown by the solid line in FIG. In the first position, the lower guide member 106 is connected to the third roller 42 and the fourth roller 42 from the upper portion of the roller 84.
Of the roller 62, and the upper guide member 108 extends from the lower part of the roller 88 toward the nip of the roller 42 and the fourth roller 62 of FIG. 3, thus making a copy as described below. It becomes possible to carry the paper to the upstream side of the copy paper carrying means (not shown). On the other hand, the electromagnetic solenoid 11
6 is deenergized, the support shaft 11
0 is rotated in the counterclockwise direction in FIG. 1, and thus the lower guide member 106 and the upper guide member 108 are integrally rotated about the support shaft 110 so as to move to the second position shown by the chain double-dashed line in FIG. Located in. In the second position, the lower guide member 106 is moved from the substantially central portion of the roller 80 to the first position.
Of the roller 20 and the second roller 38, and the upper guide member 108 extends from the vicinity of the substantially central portion of the roller 88 toward the nip of the first roller 20 and the second roller 38. Thus, the copy paper can be discharged to the outside of the housing (not shown) as described later.

The discharge section of the above-mentioned double-sided copying machine is further provided with a copy sheet reversing section 118 and guide plate pairs 120 and 122. The copy sheet reversing unit 118 shown in the figure is composed of a pair of guide holding plates 124 and 126 arranged at intervals.
It extends downstream of the third roller 42 and the fourth roller 62. The pair of guide plates 120 and 122 extend from the downstream side of the first roller 20 and the second roller 38 toward the outside of the housing.

In the double-sided copying machine provided with the copy paper carrying mechanism 2 having the above-mentioned structure, the copy paper is carried as follows.

Copy paper conveying means (not shown) mainly referring to FIG.
The copy sheet conveyed through the copy sheet conveying path by the action of (1), one side of the copy sheet is copied while being conveyed through the copy sheet conveying path, as shown by an arrow 128. It is conveyed to the nip portion of the rollers 80 and 88 of the conveying means 72 through the side and the guide member 96.

When the copy paper is discharged out of the housing (not shown) (in other words, when one side of the copy paper is copied in single-sided copying, or when both sides of the copy paper are copied in double-sided copying) The electromagnetic solenoid 116 is deenergized and the switching means 74 is held at the second position shown by the chain double-dashed line in FIG. Therefore, the copy sheet conveyed in the direction shown by the arrow 128 is nipped between the rollers 80 and 88, and the lower guide member 10 is operated by the cooperation of these rollers.
It is conveyed between the first roller 20 and the second roller 38 of the copy sheet conveying mechanism 2 through between 6 and the upper guide member 108. When the copy sheet is conveyed to the copy sheet conveying mechanism 2, the first
The copy paper conveyed as described above by nipping the rollers 20 and the second roller 38 between the guide plates 120 and 122 mainly by the cooperation of the first roller 20 and the second roller 38. And is conveyed to the outside of the housing. At this time, since the first roller 20 acting as a driving roller is made of a material having a relatively high coefficient of friction, the first roller 20 surely acts on the back surface of the copy paper, and the above-described conveyance of the copy paper is prevented. Definitely carried out. Further, during such conveyance, as can be understood from FIG.
Due to the provision of the protrusion 26 on the roller 20 of the above, the protrusion 26 acts on the lower surface of the copy paper while the copy paper is nipped between the first roller 20 and the second roller 38. As a result, the copy paper tends to be bent in a direction perpendicular to the conveying direction, that is, in the left-right direction in FIG. 2, in a somewhat wavy shape. Delivers even weak copy paper.

On the other hand, when the copy sheet is guided to the upstream side of the copy sheet conveying means (in other words, when the copy sheet is copied on one side of the double-sided copy sheet, the other side of the copy sheet is also copied), the electromagnetic solenoid 116 is used. The switching means 74 is energized to be held in the first position shown by the solid line in FIG. 1, and the electromagnetic solenoid 58 is deenergized to hold the fourth roller 62 in the non-acting position. . Therefore, the copy sheet conveyed in the direction indicated by the arrow 128 is nipped between the rollers 80 and 88, and passes through between the lower guide member 106 and the upper guide member 108 by the cooperation of these rollers, and further, the copy sheet conveying mechanism 2 moves. It is conveyed to the copy paper reversing unit 118 through between the third roller 42 and the fourth roller 62 in the non-acting position. Then, the copy paper is conveyed so that its trailing end is the roller 80 and the roller 8.
8 and the electromagnetic solenoid 5 when discharged from the nip portion.
8 is biased and the fourth roller 62 is positioned in the working position as described above. As a result, the fourth roller 62 presses the copy paper against the peripheral surface of the third roller 38,
The third roller 42 and the fourth roller 62 form the copy paper reversing unit 1.
The lower guide member that acts on the rear end portion of the copy sheet conveyed to 18 and is located at the first position mainly from the rear end side by the cooperation of the third roller 42 and the fourth roller 62. Conveying means 7 passing between 106 and upper guide member 108
It is conveyed toward between the two rollers 80 and 84. At this time, since the third roller 42 acting as a driving roller is made of a material having a relatively high coefficient of friction, the third roller 42 reliably acts on the back surface of the copy paper, and the above-described conveyance of the copy paper is prevented. Definitely carried out. The copy paper conveyed as described above is then nipped between the rollers 80 and 84, and the cooperative action of these rollers allows the other end of the guide member 94 and the guide plate 10 to be conveyed.
It is conveyed to the pair of conveying rollers 100 and 102 through the space 4 between them, and the pair of conveying rollers 100 and 102 conveys the copy paper further downstream toward the upstream side of the copy paper conveying means.

Although one specific example of the copy paper conveying mechanism configured according to the present invention has been described above, the present invention is not limited to this specific example, and various modifications and corrections can be made without departing from the scope of the present invention. It is possible.

For example, in the specific example, the protrusions 26 are provided at the outer ends of the pair of first rollers 20 arranged on the inner side in the width direction of the copy paper conveyance path, but instead of these, the rollers 20 are provided. The protrusions may be provided on the other inner ends of the rollers or on both ends of the rollers 20. Further, the protrusions 26 may be provided on both ends of the pair of first rollers 20 arranged on the outer sides in the width direction. However, those rollers 20 instead
It may be provided at one outer end or the other inner end, and the above-described desired effects can be achieved without providing the projection 26.

Further, for example, in a specific example, the lower support frame body 10 and the upper support frame body 1 mounted on the lower support frame body 10 so as to be freely opened and closed.
Although the present invention has been described as being applied to a double-sided copying machine having a shell-type support structure consisting of two, the present invention is not limited to this and can be applied to an apparatus having no shell-type support structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a discharge section of a double-sided copying machine provided with a copy paper conveying mechanism constructed according to the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. 2 ... Copy paper transport mechanism 4 ... First shaft member 6 ... Second shaft member 8 ... Third shaft member 20 ... First roller 38 ... Second roller 42 ... Third Roller 62 ... Fourth roller 70 ... Copy paper switching / transporting mechanism 72 ... Transporting means 74 ... Switching means

Claims (6)

[Claims] 1. A first shaft member which is disposed in a discharge part of a double-sided copying apparatus and which is rotated in a predetermined direction, a first roller which is mounted on the first shaft member, and a first roller. A second shaft member arranged at a distance from the shaft member; a second roller attached to the second shaft member and driven by the first roller; and a second shaft A third roller mounted on a member and rotated by being driven by the second roller, and movable between a working position acting on the third roller and a non-working position separated from the third roller. The first roller and the third roller are made of a material having a relatively high coefficient of friction, and the second roller is made of a material having a relatively low coefficient of friction. When the copy paper is guided to the outside of the housing, the copy paper is transferred by the cooperation of the first roller and the second roller. When it is conveyed toward the outside of the housing, and when it is guided to the upstream side of the copy sheet conveying means, it is guided to the copy sheet reversing portion through the third roller and the pressing means in the non-acting position, and then the third roller. And a copy paper transport mechanism which is transported toward the upstream side of the copy paper transport means by the action of the pressing means set to the operating position. 2. The second roller and the third roller are symmetrically arranged on both sides in the width direction with respect to the center in the width direction of the copy sheet conveying path. The described copy paper transport mechanism. 3. The copy according to claim 1 or 2, wherein the first roller and the third roller are made of rubber and the second roller is made of synthetic resin. Paper transport mechanism. 4. The pressing device according to claim 1, further comprising a fourth roller which is driven by the third roller when in the operating position. The described copy paper transport mechanism. 5. The copy paper transport mechanism according to claim 4, wherein the fourth roller is made of synthetic resin. 6. A copy according to claim 1, wherein at least one end peripheral surface of the first roller is provided with a projection over the entire circumference thereof. Paper transport mechanism.