JPH0674107B2 - Copy paper reverse feeding mechanism in double-sided copying machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a copying paper reverse feeding mechanism, and more specifically, in a double-sided copying machine, after guiding copying paper to a copying paper reversing unit, the copying paper is fed upstream of copying paper conveying means. The present invention relates to a copy paper reverse feeding mechanism that reversely feeds paper toward the side.

<Prior 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. In the case of double-sided copying, the copy paper is guided to the copy paper reversing unit and then conveyed to the upstream side of the copy paper conveyance path through the copy paper return conveyance path, and then again conveyed through the copy paper conveyance path. (The other surface is also copied during such conveyance), and the sheet is ejected to the outside of the housing.

The double-sided copying apparatus is provided with a copy paper reverse-feeding mechanism for that purpose because the copy paper needs to be reverse-feeded as described above. This type of copy paper reverse feeding mechanism includes, for example, a reverse feeding roller mounted on a shaft member that is rotated in a predetermined direction, an operating position that acts on the reverse feeding roller, and a non-operating position that separates from the reverse feeding roller. It is known that the driven roller is mounted so as to be movable between them.

However, in the above-described known copy paper reverse feeding mechanism, the driven roller is selectively positioned at the working position and the non-working position, so that a relatively strong actuation source is required due to the weight of the driven roller, There is an inconvenience that the production cost becomes high.

<Objects of the Invention> The present invention has been made in view of the above facts, and its main object is to provide an improved copy paper reverse feed capable of reliably sending a copy paper with a relatively simple configuration. It is to provide a mechanism.

<Summary of the Invention> According to the present invention, a shaft member that is rotated in a predetermined direction, a drive roller that is mounted on the shaft member and is formed of a material having a relatively high coefficient of friction, and a gap between the shaft member and the drive roller. It is made of a material having a relatively high coefficient of friction, and a rotary shaft that is rotatably mounted on the rotary shaft, a plurality of first rollers that are axially spaced from the rotary shaft, and that are driven by the drive roller. A reverse feed roller including a second roller, and a movably mounted between a working position of the reverse feed roller that acts on the second roller and a non-working position that is separated from the second roller. A pressure contact plate, and when the copy paper is guided to the copy paper reversing unit, the pressure contact plate is held in the non-acting position, and thus the copy paper is conveyed between the reverse feeding roller and the pressure contact plate in the non-acting position, On the other hand, the copy paper is guided to the upstream side of the copy paper conveying means. Kiniwa,
The reverse feed of copy paper in a double-sided copying machine, characterized in that the pressure contact plate is held in the working position, and thus the copy paper is conveyed by the action of the second roller of the reverse feed roller and the pressure contact plate. A mechanism is provided.

<Preferred Specific Example of the Invention> Hereinafter, with reference to the accompanying drawings, a preferred specific example of the copy sheet reverse feeding 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 reverse feeding mechanism 2 includes a reverse feeding roller 4 and a pressure contact plate 6 that is pressed against the reverse feeding roller 4. Referring to FIG. 2 together with FIG. 1, the illustrated double-sided copying machine has a shell-type support structure composed of a lower support frame 8 and an upper support frame 10 mounted on the lower support frame 8 so as to be openable and closable. However, when the upper support frame 10 is in the closed position (the position shown in FIG. 2), the lower support frame 8
The various components mounted on the upper support frame body 10 are held in the positional relationship shown in FIGS. 1 and 2. More specifically, the upper support frame 10 has a vertical front substrate 12 and a vertical rear substrate 14 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). is doing. Vertical front substrate 12 of upper support frame 10
And an L-shaped mounting piece 16 on the inner surface of the vertical rear substrate 14, respectively.
And 18 are mounted, and a rotary shaft 22 is rotatably mounted between the lower ends of the mounting pieces 16 and 18 via a bearing member 20.
A plurality of reverse feed rollers 4 are mounted on the rotary shaft 22 at intervals in the axial direction. In the specific example, the backfeed roller 4 includes a first roller 24 formed of a material having a relatively low coefficient of friction and a second roller 26 formed of a material having a relatively high coefficient of friction, the first roller The outer diameters of 24 and the second roller 26 are substantially equal. The first roller 24 is preferably made of synthetic resin, and the second roller 26 is preferably made of synthetic rubber. As shown in FIG. 2, the first roller 24 and the second roller 26 are symmetrically arranged on both sides of the central portion of the rotary shaft 22, and from the central portion of the rotary shaft 22 to both axial sides thereof. A pair of first rollers 24, a pair of second rollers 26 and a pair of first rollers 24 are arranged.

The pressure contact plate 6 is arranged corresponding to the second roller 26 of the reverse feed roller 4. More specifically, the upper support frame 10
A support shaft 30 is rotatably mounted between a vertical front substrate 12 and a vertical rear substrate 14 via a bearing member 28, and a support shaft 30 is provided at an intermediate portion of the support shaft 30 in the axial direction corresponding to the second roller 26. And a pair of pressure contact plates 6 are attached. The pressure contact plate 6 is preferably formed of an elastic material such as metal or synthetic resin, and in the specific example, is formed of an elongated plate member made of synthetic resin. One end of a lever member 32 is fixed to the rear end portion (the left end portion in FIG. 2) of the support shaft 30, and the other end portion of the lever member 32 is an electromagnetic solenoid 34 acting as an operation source via a pin member 33. Is connected to the output end 34a of. The electromagnetic solenoid 34 is mounted on a mounting member 36 fixed to the inner surface of the vertical rear substrate 14. Therefore, when the electromagnetic solenoid 34 is urged, the support shaft 30 is urged via the lever member 32.
Is rotated clockwise in FIG. 1, and the pressure contact plate 6 is moved to the first position.
It is located in the working position shown in solid lines in the figure and shown in FIG. In such an operating position, each pressing plate 6 is pressed against the corresponding second roller 26, and the corresponding second roller 26 is pressed.
It acts elastically on the circumferential surface of 26 by its own elasticity. On the other hand, when the electromagnetic solenoid 34 is deenergized, the support shaft 30 is rotated counterclockwise in FIG. 1 via the lever member 32 by the action of a spring member (not shown), and the pressure contact plate 6 is moved to the first position. It is located in a non-acting position shown by a chain double-dashed line in the figure. In the non-acting position, each pressure contact plate 6 is separated from the corresponding second roller 26 and does not act on the second roller 26. In the specific example, the press contact plate 6 is provided corresponding to the second roller 26, but instead of this, a wide press contact plate continuously extending in the axial direction of the rotating shaft 22 is provided, and the press contact plate 6 is provided at the operating position. In some cases, the pressure contact plate is the first roller 24 and the second roller.
Can also be configured to act on the roller 26 of the.

In the specific example, a shaft member 38 that is driven to rotate in a predetermined direction is provided in relation to the rotary shaft 22, and a drive roller 40 is attached to the shaft member 38. The lower support frame 8 has a vertical front substrate 42 and a vertical rear substrate 44, which are arranged at intervals in the front-rear direction, and the shaft member 38 is provided with a bearing member 46 between the vertical front substrate 42 and the vertical rear substrate 44. It is mounted rotatably through.
The rear end side (the left end side in FIG. 2) of the shaft member 38 penetrates the vertical rear substrate 44 of the lower support frame 8 and projects rearward, and a transmission member (not shown) such as a sprocket is provided at the rear end portion. Is installed. 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. At the intermediate portion of the shaft member 38 as described above, the drive rollers 40 are mounted at intervals in the longitudinal direction of the shafts corresponding to the respective first rollers 24, and the peripheral surfaces of the drive rollers 40 correspond to each other. First roller 24
It is brought into contact with the peripheral surface of the above as described later. Therefore, when the main drive source is operated, the drive force is transmitted to the shaft member 38 via the transmission member and the transmission member, and the drive roller 38 is rotated in the direction shown by the arrow 48 (FIG. 1), and accordingly. As a result, the first roller 24 is driven in the direction shown by the arrow 50 (FIG. 1), and the second roller 26 is also rotated in the direction shown by the arrow 50.
In the illustrated example, each drive roller 40 has a projection 52 at least at one end, as shown in FIG. That is, the pair of drive rollers 40 arranged on the inner side in the axial direction of the shaft member 38 has one outer end (the roller on the right side in FIG. 2).
A pair of drive rollers disposed on the outer side in the width direction is provided with an annular protrusion 52 over the entire circumference at the right end portion of the roller 40 and the left end portion of the roller 40 on the left side in FIG.
The 40 is provided with annular projections 52 at both ends (both left and right sides in FIG. 2) over the entire circumference thereof. The drive roller 40 having such a structure is preferably formed of a material having a relatively high coefficient of friction, particularly synthetic rubber. The length of the drive roller 40 in the width direction is longer than the length of the first roller 24 in the width direction, and the first roller 24 is brought into contact with each drive roller 40 as follows. That is, the pair of first rollers 24 arranged on the inner side in the width direction of the rotary shaft 22 comes into contact with the corresponding drive rollers (the pair of inner drive rollers 40) at a position slightly inner than the center in the width direction. The pair of first rollers 24, which are arranged on the outer side in the width direction, are brought into contact with the central portion between the protrusions 52 of the corresponding drive roller 40 (the pair of outer drive rollers 40), and There is some gap between the roller 24 and the corresponding protrusion 52 of the drive roller 40.

Referring to FIG. 1, a copy paper switching / transporting mechanism 56 is arranged on the upstream side of the reverse feed roller 4 as viewed in the copy paper transporting direction indicated by arrow 54. The illustrated copy paper switching / transporting mechanism 56
Has a conveying means 58 arranged upstream in the copying paper conveying direction shown by an arrow 54 and a switching means 60 arranged between the conveying means 58 and the downstream side, that is, between the conveying means 58 and the above-mentioned reverse feeding roller 4. There is.
The conveying means 58 shown in the figure includes a roller 66 mounted on a shaft member 64 rotated in a direction indicated by an arrow 62, and a roller 70 mounted on a shaft member 68 rotatably arranged below the shaft member 64. And a roller 74 mounted on a shaft member 72 rotatably arranged above the shaft member 64. In the specific example, the roller 66
And 70 are mounted on the lower support frame body 8, and the rollers 74 are mounted on the upper support frame body 10. The roller 70 is brought into contact with the lower portion of the roller 66, and is driven in the direction shown by the arrow 76 in accordance with the rotation of the roller 66 in the direction shown by the arrow 62. The roller 74 is in contact with the upper portion of the roller 66, and is driven in the direction indicated by the arrow 78 as the roller 66 rotates in the direction indicated by the arrow 62. Guide members 80 and 82 are arranged upstream of the rollers 66 and 74. One end sides of the guide members 80 and 82 extend to a lower roller and an upper roller of a fixing device (not shown). Further, in relation to the rollers 66 and 70, conveying roller pairs 86 and 88 are arranged on the downstream side in the copy paper returning direction indicated by the arrow 84. The pair of transport rollers 86 and 88 are used to transport a copy sheet having a copy on one side thereof as will be described later (the copy sheet transporting means transports the copy sheet through the transfer area as required). Stipulates) to act toward the upstream side. The rollers 66 and 70 and the conveying roller pair 86
Between 88 and 88, the other end side of the guide member 80 and the guide plate 90 extend.

The illustrated switching means 60 includes a lower guide member 92 and an upper guide member 94 which are arranged at a distance from each other, and is configured so that the lower guide member 92 and the upper guide member 94 can move integrally. . In the specific example, the lower guide member 92 is fixed to a support shaft 96 that is rotatably mounted. The support shaft 96 has a connecting member.
98 is fixed, and the tip of the connecting member 98 is the pin member 10
It is connected to the output end 102a of the electromagnetic solenoid 102 via 0. As described above, when the electromagnetic solenoid 102 is urged, the support shaft 96 is rotated clockwise in FIG. 1 via the connecting member 98, thus supporting the lower guide member 92 and the upper guide member 94. It is rotated integrally about the shaft 96 and positioned at the first position shown by the solid line in FIG. In the first position, the lower guide member 92 extends from the upper portion of the roller 70 toward the reverse feeding roller 4, and the upper guide member 94 extends from the lower portion of the roller 74 toward the pressure contact plate 6 in the non-acting position. Thus, it becomes possible to convey the copy sheet to the upstream side of the copy sheet conveying means (not shown) as described later. On the other hand, when the electromagnetic solenoid 102 is deenergized, the support shaft 96 is rotated counterclockwise in FIG. 1 via the connecting member 98, and thus the lower guide member 92 and the upper guide member 94 are moved to the support shaft 96.
Is rotated around the center and is positioned at a second position indicated by a chain double-dashed line in FIG. In the second position, the lower guide member 92 extends from the substantially central portion of the roller 64 toward the upper portion of the drive roller 40, and the upper guide member 94 includes the roller 74.
The sheet extends from the vicinity of the substantially central portion toward the lower part of the reverse feeding roller 4, and thus the copy paper can be discharged to the outside of the housing (not shown) as described later. A copy paper reversing unit 104 and guide plate pairs 106 and 108 are further provided in the discharge unit of the above-described double-sided copying apparatus. The illustrated copy sheet reversing unit 104 includes a pair of guide holding plates 110 arranged at intervals.
And 112, and is arranged on the downstream side of the copy paper reverse feeding mechanism 2. The pair of guide plates 106 and 108 extend from the downstream side of the driving roller 40 and the first roller 24 toward the housing (not shown).

In the double-sided copy paper device including the copy paper reverse feeding mechanism 2 having the above-described structure, the copy paper is conveyed as follows.

Mainly referring to FIG. 1, a copy sheet conveyed through a copy sheet conveying path by the action of a copy sheet conveying means (not shown) (while being conveyed through the copy sheet conveying path,
One side of the copy paper is copied), and is conveyed to the nip portion of the rollers 66 and 74 of the conveying means 58 through one end side of the guide member 80 and the guide member 82 as shown by an arrow 114.

When the copy paper is guided to the upstream side of the copy paper conveying means (in other words, when copying is performed on the other side of the copy paper which has been copied on one side in double-sided copying), the electromagnetic solenoid 102 is used.
Is energized, the switching means 60 is held in the first position shown by the solid line in FIG. 1, and the electromagnetic solenoid 34 is deenergized to hold the pressure contact plate 6 in the non-acting position. Therefore, the copy sheet conveyed in the direction shown by the arrow 114 is nipped between the rollers 66 and 74, and passes through the lower guide member 92 and the upper guide member 94 by the cooperation of the rollers 66 and 74, and further the second roller.
It is conveyed to the copy sheet reversing section 104 through between the pressure contact plate 6 and the pressure contact plate 6 in the non-acting position. Then, when the copy sheet is conveyed and discharged at its rear end from the nip portion between the roller 66 and the roller 74, the electromagnetic solenoid 34 is urged, and the pressure contact plate 6 is positioned at the working position as described above. . As a result, the pressure contact plate 6 elastically presses the copy paper against the peripheral surface of the second roller 26, and the second roller 26 and the pressure contact plate 6 are conveyed to the copy paper reversing unit 104 and the rear end portion of the copy paper is conveyed. The lower guide member 92 located at the first position is mainly operated by the second roller 26 and the pressure contact plate 6 from the rear end side of the copy paper.
The rollers 66 and 70 of the conveying means 58 passing between the upper guide member 94 and the upper guide member 94.
It is transported to the space. At this time, since the second roller 26 for positively feeding the copy paper backward is made of a material having a relatively high friction coefficient, the second roller 26 surely acts on the back surface of the copy paper, The above-mentioned conveyance of the copy paper is surely performed. As shown in a specific example, when the pressure contact plate 6 is composed of a relatively long plate member, when the pressure contact plate 6 is moved to the working position as described above, the tip of the pressure contact plate 6 is located behind the copy paper. Acts on the end and moves the rear end to the lower guide member 92
The upper surface of the sheet can be elastically pressed, and thus even a copy paper having a curled rear end can be reliably fed back. The copy paper, which has been fed back as described above, is then nipped between the rollers 66 and 70, and is transported to the transport roller pair 86 and 88 through the other end of the guide member 80 and the pressure contact plate 90 by the cooperation of these. The pair of conveyance rollers 86 and 88 conveys the copy sheet further downstream toward the upstream side of the copy sheet conveying means.

On the other hand, 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 102 is deenergized and the switching means 60 is held at the second position shown by the chain double-dashed line in FIG. Therefore, the copy sheet conveyed in the direction indicated by the arrow 114 is nipped between the rollers 66 and 74, and the cooperative operation of these passes between the lower guide member 92 and the upper guide member 94 to drive the first roller 24. It is conveyed between rollers 40. The copy paper thus conveyed is fed by the first roller 24.
And the drive roller 40, and mainly the first roller 24
And the driving roller 40 cooperate with each other to convey the sheet through the guide plates 106 and 108 to the outside of the housing. In this case, since the driving roller 40 for positively conveying the copy paper is made of a material having a relatively high coefficient of friction, the driving roller 40 surely acts on the back surface of the copy paper, and the above-mentioned conveyance of the copy paper is performed. Is surely carried out. Also, during such transportation,
As can be seen from FIG. 2, because the drive roller 40 is provided with the protrusions 52, the copy paper is nipped between the drive roller 40 and the first roller 24. The projections 52 act on the lower surface of the copy paper, which tends to cause the copy paper to be curved in a wave shape in a direction perpendicular to the transport direction, that is, in the left-right direction in FIG. This makes it possible to reliably convey even copy paper, which is relatively weak.

In the above-mentioned specific example, since the pressure contact plate 6 is provided corresponding to the second roller 26, the pressure contact plate 6 can be made relatively small and lightweight, and in the small operation source, in the specific example. The pressure contact plate 6 can be moved as required by the electromagnetic solenoid 34.

Although one specific example of the copy sheet reverse feeding 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 are made without departing from the scope of the present invention. Is possible.

For example, in the specific example, the projection 52 is provided at one outer end of the pair of drive rollers 40 arranged on the axial side of the shaft member 38, but instead of this, the inner side of the rollers 40, etc. The projections may be provided at the end portions or both ends of those rollers 40, and the projections 52 are provided at both end portions of the pair of drive rollers 40 arranged on the outer sides in the width direction thereof.
Alternatively, the rollers 40 may be provided at one outer end or the other inner end of the roller 40, and the required effects described above can be achieved without providing the protrusion 52.

Furthermore, for example, in a specific example, a lower support frame 8 and an upper support frame 10 mounted on the lower support frame 8 so as to be freely opened and closed.
Although the present invention has been described as being applied to the double-sided copying machine having the shell type support structure, the present invention is not limited to this, and the present invention can also be applied to an apparatus having no shell type support structure.

<Effects of the Invention> According to the copy paper reverse feeding mechanism in the double-sided copying apparatus according to the present invention, the second paper acts on the second roller in order to reversely feed the copy paper in cooperation with the second roller. Since the member configured to be movable between the acting position and the non-acting position separated from the second roller is a pressure contact plate, its weight is significantly reduced as compared with a conventionally used driven roller. Therefore, the driving means for operating this can be downsized, and an inexpensive device can be obtained.

Further, according to the present invention, since the reverse feeding roller has the function of the driven roller that cooperates with the driving roller to discharge the copy paper, the number of parts can be minimized, and the entire apparatus can be made inexpensive. Can be configured.

[Brief description of drawings]

FIG. 1 is a diagram showing a discharge section of a double-sided copying apparatus having a copy sheet reverse feeding mechanism constructed according to the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. 2 ... Copy paper reverse feeding mechanism 4 ... Reverse feeding roller 6 ... Pressure contact plate 22 ... Rotating shaft 24 ... First roller 26 ... Second roller 38 ... Shaft member 40 ... Driving roller 54 ... Copy paper switching / transporting mechanism

Claims (7)

[Claims] 1. A shaft member which is rotated in a predetermined direction, a drive roller which is mounted on the shaft member and is made of a material having a relatively high coefficient of friction, and a rotary member which is rotatably mounted at a distance from the shaft member. A plurality of rotating shafts, and a plurality of the rotating shafts arranged at intervals in the axial direction of the rotating shafts and driven by the drive rollers.
Second roller and second material made of relatively high coefficient of friction material
And a pressure contact plate movably mounted between a working position of the back feeding roller that acts on the second roller and a non-working position that is separated from the second roller. When the copy paper is guided to the copy paper reversing unit, the pressure contact plate is held in the non-acting position, and thus the copy paper is conveyed between the reverse feeding roller and the pressure contact plate in the non-acting position, while copying is performed. When guiding the paper to the upstream side of the copy paper conveying means,
The reverse feed of copy paper in a double-sided copying machine, characterized in that the pressure contact plate is held in the working position, and thus the copy paper is conveyed by the action of the second roller of the reverse feed roller and the pressure contact plate. mechanism. 2. The first roller and the second roller forming the reverse feeding roller are symmetrically arranged on both sides of a central portion of the rotary shaft as a center. A copying paper reverse feeding mechanism in the double-sided copying machine according to item 1. 3. The double-sided press according to claim 1, wherein the press-contact plate is made of an elastic material and elastically acts on the peripheral surface of the second roller when in the operating position. Copy paper reverse feeding mechanism in the copying machine. 4. A copying paper reverse feeding mechanism in a double-sided copying machine according to claim 1, wherein said second roller is made of synthetic rubber. 5. A copying paper reverse feeding mechanism in a double-sided copying apparatus according to claim 1, wherein at least one end peripheral surface of said drive roller is provided with a projection over the entire circumference thereof. 6. A copying paper reverse feeding mechanism in a double-sided copying machine according to claim 1, wherein said first roller is made of a material having a relatively low coefficient of friction. 7. The first roller is made of synthetic resin,
The copy paper reverse feeding mechanism in the double-sided copying apparatus according to claim 1, wherein the drive roller is made of synthetic rubber.