JP3734525B2 - Static eliminator for electrostatic copying machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an electrostatic copying machine, more specifically, a copy paper transport path disposed opposite to a copy paper transport path downstream from a fixing device for fixing a toner image transferred onto the copy paper in an image transfer area. The present invention relates to a static eliminator of an electrostatic copying machine that removes static electricity charged on a copy sheet by contacting the copy sheet moving above.
[0002]
[Prior art]
The electrostatic copying machine transfers the toner image formed on the photosensitive member to the copy paper supplied to the transfer area by the copy paper supply means, and transports the copy paper on which the toner image is transferred to the fixing device to fix it. After that, it is configured to convey toward the discharge unit. In such an electrostatic copying machine, since a transfer voltage such as a corona discharge for transfer is applied to the copy paper at the time of transfer, a considerable amount of static electricity is charged. If the copy paper is transported to the discharge section while being charged with static electricity, smooth transfer of the copy paper will be hindered by the action of static electricity, or the discharged copy paper will attract each other, making it difficult to organize the documents. Come. In order to eliminate the problems caused by static electricity charged on the copy paper, the electrostatic copier removes static electricity charged on the copy paper to the copy paper conveyance path for conveying the copy paper on which the toner image is transferred. Is arranged. The static eliminator comprises a holding member made of a conductive material attached to a conductive attachment member attached to the airframe, and a fiber brush made of a conductive material attached to the lower end portion of the holding member. The brush is brought into contact with the copy paper moving on the copy paper conveyance path.
[0003]
[Problems to be solved by the invention]
Thus, the conventional static eliminator only serves to remove the static electricity charged on the copy paper, and has no other function. On the other hand, the copy paper to which the toner image has been transferred is heated by the fixing device, so that when the paper is cooled during conveyance, a so-called paper curl is generated which is curved due to a temperature difference between the front and back sides. If the degree of paper curl is large, a copy paper conveyance failure occurs, which causes a paper jam.
[0004]
The present invention has been made in view of the above points, and the main technical problem is to remove static electricity charged on the copy paper and to suppress the amount of paper curl generated on the copy paper after fixing. An object of the present invention is to provide a static eliminator for an electrostatic copying machine having a conveyance guide function.
[0005]
[Means for Solving the Problems]
  In order to achieve the main technical problem, according to the present invention, a copy paper transport path downstream of a fixing device for fixing a toner image transferred to a copy paper in an image transfer area.The transport roller and the discharge roller are disposed in the transfer roller, and return reversing means for switching the copy paper to be transported between the discharge roller side and the feed reverse path side is disposed between the transport roller and the discharge roller. In the installed electrostatic copying machine, it is attached to the hanging portion of the fixing cover which is disposed above the copying paper conveying path between the conveying roller and the discharge roller and covers the fixing device. A static eliminator of an electrostatic copying machine that neutralizes static electricity charged on the copy paper in contact with the copy paper moving along the copy paper transport path,
A holding member made of a conductive material having a mounting portion mounted on the hanging portion of the fixing cover, and a guide portion that is connected to the lower end of the mounting portion and is inclined at a predetermined angle; and A fiber brush that is attached to the tip of the guide portion so as to extend in the same direction as the guide portion, and the attachment portion is attached to the hanging portion of the fixing cover, and the downstream side of the copy paper moving direction. The fiber brush contacts the copy paper at an acute angle.
  There is provided a static eliminator for an electrostatic copying machine.
[0006]
[Action]
The static eliminator of the electrostatic copying machine according to the present invention is such that the copy paper on which the toner image is transferred in the image transfer area and the toner image is fixed by the fixing device contacts the fiber brush of the static eliminator when moving along the copy paper conveyance path. Then, the static electricity charged on the copy paper is grounded to the machine body through the conductive mounting member via the fiber brush and the holding member, and is neutralized. Further, when the copy paper passes through the static eliminator, the copy paper abuts against the guide portion of the holding member to suppress paper curl and is guided and conveyed by the guide portion.
[0007]
【Example】
Referring now to the accompanying drawings showing a preferred embodiment of a static eliminator for an electrostatic copying machine constructed according to the present invention, it will be described in further detail.
FIG. 1 schematically shows main components in an electrostatic copying machine to which a static eliminator constructed according to the present invention is applied. The electrostatic copying machine shown in FIG. 1 includes a substantially rectangular parallelepiped housing 2. On the upper surface of the housing 2, a stationary transparent plate 4 on which a document to be copied (not shown) is placed, and an openable / closable document press for covering the transparent plate 4 and the document placed thereon. A member 6 is disposed. A rotating drum 8 having an electrostatic photosensitive member on the peripheral surface is rotatably mounted at a substantially central portion in the housing 2. A charging area 12, an exposure area 14, a development area 16, a transfer area 18, and a cleaning area 20 are arranged around the rotating drum 8 that is rotationally driven in the direction indicated by the arrow 10 as viewed in the direction indicated by the arrow 10. It is installed. The charging area 12 is provided with a charging corona discharger 22, the developing area 16 is provided with a developing device 24, and the transfer area 18 is provided with a transfer corona discharger 26 and a peeling corona discharger 28. A residual toner removing blade 32 is disposed in the cleaning area 20.
[0008]
Above the rotating drum 8, an optical system generally indicated by numeral 34 is disposed. The optical system 34 includes a movable document illumination lamp 36, a first movable reflector 38, a second movable reflector 40, a third movable reflector 42, a stationary lens assembly 44, and a stationary reflector 46. . At the time of scanning exposure, the movable document illumination lamp 36 and the first movable reflecting mirror 38 move at the required speed V, for example, from the scanning exposure start position shown in FIG. The second movable reflecting mirror 40 and the third movable reflecting mirror 42 are half the required speed from the scanning exposure start position shown in FIG. 1 substantially horizontally to the right, for example, to the maximum scanning exposure end position. Moved at V / 2. At this time, the document placed on the transparent plate 4 is irradiated by the movable document illumination lamp 36, and the reflected light from the document is reflected in the first, second and third directions as indicated by the one-dot chain line in FIG. The light is sequentially reflected by the movable reflecting mirrors 38, 40 and 42 to reach the lens assembly 44, and then reflected by the stationary reflecting mirror 46 and projected onto the photosensitive member of the rotary drum 8 in the exposure area 14. When the scanning exposure is completed, the movable document illumination lamp 36 and the first, second and third reflecting mirrors 38, 40 and 42 are returned to the scanning exposure start position.
[0009]
At one end of the housing 2, i.e., the right end in FIG. The illustrated copy paper supply means 48 includes a lower cassette receiving portion 50a, an intermediate cassette receiving portion 50b, and an upper cassette receiving portion 50c. The lower cassette receiving portion 50a, the intermediate cassette receiving portion 50b, and the upper cassette receiving portion 50c are selectively attached to or detached from any of several types of copying paper cassettes 52 that store sheet-like copying paper of different sizes. Can be installed freely. Each of the lower cassette receiving portion 50a, the intermediate cassette receiving portion 50b and the upper cassette receiving portion 50c is provided with delivery rollers 54a, 54b and 54c for delivering copy sheets one by one from the copy paper cassette 52 mounted thereon. Is arranged. The copy paper sent from the copy paper cassette 52 mounted on the lower cassette receiving portion 50a is introduced into a copy paper conveyance path indicated generally by numeral 58 through the copy paper feeding path 56a. The copy paper sent from the copy paper cassette 52 mounted on the intermediate cassette receiving portion 50b is introduced into the copy paper transport path 58 through the copy paper feed paths 56b and 56a. The copy paper sent from the copy paper cassette 52 attached to the upper cassette receiving portion 50c is introduced into the copy paper transport path 58 through the copy paper feed paths 56c, 56b and 56a. The copy paper feed path 56a is defined by guide plates 62 and 64, the copy paper feed path 56b is defined by guide plates 66, 68 and 70 and a pair of feed rollers 72, and the copy paper feed path 56c is provided by a guide plate. 68, 70, 74 and 76 and a feed roller pair 78. The illustrated copy paper supply means 48 further includes a paper feed table mechanism 80. The paper feed table mechanism 80 includes a table (not shown) that can be moved up and down, and a feed roller 82 is disposed above the table. The copy paper sent from the table mechanism 80 is introduced into the copy paper transport path 58 through the copy paper feed path 56d and a copy paper resupply path described later. The copy paper feed path 56d is defined by the guide plates 84 and 86 and the feed roller pair 88.
[0010]
The copy paper conveyance path 58 includes a downstream portion of the guide plate 64 and a downstream portion of the guide plate 94, a conveyance roller pair 96, a guide plate pair 98, a conveyance roller pair 100, a guide plate 102, and the transfer area 18 (that is, a rotating drum). 8 between the transfer corona discharger 26 and the peeling corona discharger 28), the conveying belt mechanism 104, the guide plate 106, the heat fixing roller pair 108 and the guide plate pair 110 constituting the fixing device, and the conveyance switching means 114. It is prescribed. The illustrated conveyance switching means 114 includes a conveyance roller mechanism 118 including three rollers arranged in the vertical direction, that is, an upper roller 115, an intermediate roller 116, and a lower roller 117, and a pair of guides that define a conveyance switching path 121. The members include a lower guide member 119 and an upper guide member 120. The upper roller 115, the intermediate roller 116, and the lower roller 117 are rotated in directions indicated by arrows, respectively, and the lower guide member 119 and the upper guide member 120 are selectively set to a lowered position indicated by a solid line and an elevated position indicated by a two-dot chain line. Positioned. A copy paper discharge path 122 is disposed downstream of the conveyance switching means 114. The copy paper discharge path 122 is defined by a guide plate 123 and discharge rollers 124 and 125, which constitute copy paper discharge means. A tray 126 is detachably attached to the other end of the housing 2, that is, the left end in FIG.
[0011]
  A neutralizing device configured in accordance with the present invention is disposed adjacent to the downstream side of the transport roller mechanism 118 disposed on the downstream side of the heat-fixing roller pair 108 that defines the copy paper transport path 58. Hereinafter, the static eliminator 90 will be described with reference to FIGS. 2 and 3. The static eliminator 90 in the illustrated embodiment includes a fixing cover 93 that covers the heat fixing roller pair 108 and the conveying roller mechanism 118.Drooping ofIt is attached to. The fixing cover 93 is made of a conductive material such as a steel plate or an aluminum plate, is attached to a machine body (not shown), and functions as a conductive mounting member for mounting the static eliminator 90. The static eliminator 90 is located above the copy paper conveyance path.For copy paper transport pathArranged at a substantially right angleTheThe holding member 91 includes a fiber brush 92 attached to the lower end of the holding member 91. The holding member 91 is formed by folding a plate made of a conductive material such as steel or aluminum, and is connected to a mounting portion 911 and a lower end of the mounting portion 911, and is formed by bending a predetermined angle. And. The fiber brush 92 is made of a conductive fiber material such as stainless fiber, and a part of the fiber brush 92 is sandwiched between the lower end portion of the mounting portion 911 in the holding member 91 and the guide portion 912. When the fiber brush 92 is clamped by the holding member 91, for example, it can be easily mounted by attaching a stainless fiber to a resin tape and clamping it by the holding member 91. In the static eliminator 90 configured as described above, the mounting portion 911 of the holding member 91 is mounted on the fixing cover 93 by fixing means 94 such as bolts and nuts. The static eliminator 90 attached to the fixing cover 93 has a guide function for guiding the copy paper to be conveyed, with the guide portion 912 inclined at a predetermined angle downstream in the copy paper moving direction. Also, the fiber brush 92 is applied to copy paper whose tip is conveyed on the copy paper conveyance path.At an acute angleIt is comprised so that it may contact.
[0012]
In association with the conveyance switching means 114, a feed reversing means 127 and a copy paper returning means 128 are provided. The illustrated feed reversing means 127 includes a feed reversing path 129 having a curved portion for guiding and holding the copy paper. The feed reversing path 129 includes an outer guide plate 130 that forms the outside of the curved portion. It is prescribed | regulated by the inner side guide plate 131 which forms the inner side of a curved part. As shown in FIG. 2, the outer guide plate 130 constituting the feed reversing path 129 has a plurality of openings 132 formed at intervals in the width direction. The feed reversing unit 127 also includes a reverse feed roller 133. The reverse feed roller 133 is selectively positioned at a non-operation position indicated by a solid line and an operation position indicated by a two-dot chain line. When the reverse feed roller 133 is positioned at an operation position indicated by a two-dot chain line, the reverse feed roller 133 acts on a transport roller 135 attached to a shaft 134 on which one discharge roller 125 of the discharge roller is mounted. The reverse roller 133 is operated from the non-operating position to the operating position by the reverse roller operating means 136 (see FIG. 2). The reverse feed roller actuating means 136 includes a rotation shaft 138, an arm 139 that connects the shaft 137 on which the reverse feed roller 133 is rotatably mounted to the rotation shaft 138, and an operation lever 140 connected to the rotation shaft 138. And a solenoid 141 for operating the operating lever 140. The rotating shaft 138 is urged to rotate counterclockwise in FIG. 2 by an urging means (not shown). Therefore, when the solenoid 141 is deenergized, the urging means (not shown) is urged. The rotating shaft 138 is rotated counterclockwise by the force, whereby the reverse feed roller 133 is positioned at the non-operating position indicated by the solid line via the arm 139 and the shaft 137. On the other hand, when the solenoid 141 is energized, the rotation shaft 138 is rotated clockwise against the urging force of the urging means (not shown) via the operation lever 140, thereby causing the arm 139 and the shaft 137 to move. Accordingly, the reverse feed roller 133 is positioned at an operation position indicated by a two-dot chain line.
[0013]
The copy paper return means 128 includes a return means 150 and a return control means 152, and extends from the upstream end adjacent to the upstream end of the conveyance switching mechanism 114 to be inclined slightly downward from left to right in FIG. 154 is specified. The return means 150 shown in the figure includes a guide plate pair 156, a transport roller pair 158, a guide plate pair 160, a transport roller pair 162, a guide plate pair 164, a transport roller pair 166, and a guide plate pair 168, and includes a copy paper return path 154. The return control mechanism 152 that defines the upstream side includes a conveyance roller pair 170, a swing member 172, a guide plate 174, a transport roller pair 176, a swing member 178, a guide plate 180, and a transport roller pair 182. The downstream side of the copy paper return path 154 is defined. The swing members 172 and 178 are swingable between a position indicated by a solid line in FIG. 1 and a position indicated by a two-dot chain line in FIG. As can be easily understood by referring to FIG. 1, when the lower guide member 119 and the upper guide member 120 of the transfer switching mechanism 114 are positioned at the lowered position shown by the solid line, the copy paper transfer path 58 and the copy paper discharge The path 122 communicates with each other via the transport switching path 121 in the transport switching mechanism 114. On the other hand, when the lower guide member 119 and the upper guide member 120 are positioned at the ascending position indicated by the two-dot chain line, the copy paper transport path 58 and the feed reversing path 129 pass through the transport switching path 121 in the transport switching mechanism 114. The feeding reversal path 129 and the copy paper return path 154 are communicated with each other via the conveyance switching path 121 in the conveyance switching mechanism 114.
[0014]
In the illustrated electrostatic copying machine, copy paper re-sending means generally indicated by reference numeral 190 is disposed below the copy paper return path 154. The copy paper retransmission means 190 has a receiving base 192. In the illustrated embodiment, the front portion of the cradle 192 is defined by the upper surface of the receiving block 194, and the rear portion thereof is provided on the upper surface of the receiving block 194 with a gap in the width direction (direction perpendicular to the paper surface in FIG. 1). The upper edge of the receiving rib 196 is defined. The rear portion of the cradle 192 extends slightly inclined downward in the copying paper feeding direction, and the front portion extends substantially horizontally. Stop means 198 is disposed at the front end of the cradle 192, that is, the right end in FIG. The stopping means 198 is selectively positioned at either the action position indicated by the solid line or the non-action position indicated by the two-dot chain line. A feeding roller 200 is provided above the front end of the receiving table 192. The feed roller 200 is mounted so that it can freely move upward from a position contacting the upper surface of the cradle 192 (position indicated by a two-dot chain line in FIG. 1) to a predetermined position (position indicated by a solid line in FIG. 1). Usually, it is forced downward by a biasing action by its own weight (appropriate spring means if necessary). Further, there is provided a copy paper refeeding path, generally indicated by numeral 202, extending from the front end of the copy paper retransmitting means 190 to the upstream end 90 of the copy paper transport path 58. The copy paper refeeding means for defining the copy paper refeed path 202 includes a separation roller pair 204, a guide plate pair 206, a refeed roller pair 208, a guide plate pair 210, a refeed roller pair 212, guide plates 84, 86, 214, a re-supply roller pair 216, and guide plates 94 and 218.
[0015]
The electrostatic copying machine according to the illustrated embodiment is configured as described above, and the operation thereof will be described below.
The rotating drum 8 is rotated in the direction indicated by the arrow 10. In the charging area 12, the surface of the photosensitive member on the rotating drum 8 is charged to a specific polarity by the charging corona discharger 26, and in the exposure area 14, the surface is transparent. The image of the original placed on the plate 4 is scanned and exposed on the photoconductor by the optical system 34, and thus an electrostatic latent image is formed on the photoconductor. In the developing area 16, toner is applied to the electrostatic latent image on the photoconductor by the developing device 24 and the electrostatic latent image is developed into a toner image. In the transfer area 18, the copy paper conveyed through the transfer area 18 (which will be described in detail later) is brought into contact with the surface of the photoconductor, and the transfer corona discharger 26 acts on the photoconductor. A toner image is transferred onto the copy paper. Next, the copy paper is peeled from the photoreceptor by the action of the peeling corona discharger 28. The peeled copy paper is conveyed to the heat fixing roller pair 108, and the toner image is fixed on the copy paper as it passes through the heat fixing roller pair 108. On the other hand, in the cleaning area 20, residual toner is removed from the surface of the photoreceptor by the action of the residual toner blade 32.
[0016]
Next, the conveyance of the copy paper will be described as follows. First, a case where an image is formed only on one side of a copy sheet will be described. In this case, the lower guide member 118 and the upper guide member 120 of the transport switching mechanism 114 are positioned at the lowered position indicated by the solid line. Introduced into the copy paper transport path 58 from the copy paper cassette 52 mounted on the lower cassette receiving portion 50a, the intermediate cassette receiving portion 50b or the upper cassette receiving portion 50c, or a table (not shown) of the paper feed table mechanism 80. The copy paper is conveyed through a copy paper conveyance path 58. During this time, a toner image is transferred to one side (i.e., the upper surface) of the copy paper in the transfer area 18, and the toner image is fixed on one side of the copy paper by the action of the heat fixing roller pair 108, and thus one side of the copy paper. An image is formed. Next, the copy sheet passes between the upper roller 115 and the intermediate roller 116 of the transfer switching mechanism 114 and is introduced from the copy sheet transfer path 58 to the transfer switching path 121. At this time, the copy paper tends to bend, but the paper curl is suppressed by coming into contact with the guide portion 912 of the holding member 91 constituting the static eliminator 90 and is guided by the guide portion 912 to the transport switching path 121. Be transported. During this time, the fiber brush 92 comes into contact with the copy paper, and static electricity charged on the copy paper is body-grounded to the machine body via the fiber brush 92, the holding member 91 and the fixing cover 93, and is eliminated. The copy paper conveyed to the conveyance switching path 121 as described above is discharged to the tray 126 by the discharge rollers 124 and 125. In this way, a copy having an image formed on one side is obtained.
[0017]
When forming images on both sides of the copy paper, first, the lower guide member 119 and the upper guide member 120 of the transport switching mechanism 114 are positioned at the raised position indicated by the two-dot chain line. Next, when the copying process is started, a copy paper cassette 52 mounted on the lower cassette receiving portion 50a, the intermediate cassette receiving portion 50b or the upper cassette receiving portion 50c, or a table (not shown) of the paper feed table mechanism 80. The copy paper introduced into the copy paper conveyance path 58 from the above is conveyed through the copy paper conveyance path 58. During this time, a toner image is transferred to one side (i.e., the upper surface) of the copy paper in the transfer area 18, and the toner image is fixed on one side of the copy paper by the action of the heat fixing roller pair 108, and thus one side of the copy paper. An image is formed. The copy paper from the copy paper conveyance path 58 passes between the upper roller 115 and the intermediate roller 116 of the conveyance switching mechanism 114 and is introduced into the conveyance switching path 121, and the above-described feeding reversal of the feeding reversing mechanism 127 through the conveyance switching path 121. Follow route 129. At this time, although the copy paper tends to bend, the paper curl is suppressed by contacting the guide portion 912 of the holding member 91 constituting the static eliminator 90 as described above, and is guided by the guide portion 912 and conveyed. It is conveyed to the switching path 121. During this time, the fiber brush 92 comes into contact with the copy paper, and static electricity charged on the copy paper is body-grounded to the machine body via the fiber brush 92, the holding member 91 and the fixing cover 93, and is eliminated. The copy paper introduced into the feed reversing path 129 as described above comes into contact with one discharge roller 125 located above the discharge roller whose lower surface is rotationally driven in a predetermined direction. A slip is generated between the paper discharge roller 125 and the copy paper, so that the copy paper can travel in a predetermined direction despite the roller being driven to rotate. When the rear end of the copy paper passes the downstream end of the copy paper conveyance path 58 (specifically, when it passes through the nip portion of the upper roller 115 and the intermediate roller 116), the solenoid 141 is energized and the feed reverse path 129 A reverse feed roller 133 provided at the upstream end is positioned at an operation position indicated by a two-dot chain line, whereby the copy paper is pressed against the conveyance roller 135 attached to the shaft 134 to which the discharge roller 125 is attached. As a result, the copy paper is advanced through the conveyance switching path 121 in the reverse direction by the action of the conveyance roller 135 that is rotationally driven in a predetermined direction, and passes between the intermediate roller 116 and the lower roller 117. The paper is introduced into the return path 154 and proceeds through the copy paper return path 154. The solenoid 141 is deenergized at an appropriate time after the copy paper is introduced into the copy paper return path 140 in this way, and the reverse feed roller 133 in the feed reversing mechanism 127 is returned to the non-operating position indicated by the solid line. . As described above, the copy paper P heat-fixed by the heat-fixing roller pair 108 is introduced into the feed reversing path 129 as shown by a two-dot chain line in FIG. 1, but the feed reversing path 129 is curved. Therefore, it tends to curl along the curved portion. However, in the illustrated embodiment, since the plurality of openings 132 are provided in the outer guide plate 130 that forms the outside of the curved portion in the feeding reversal path 129, the copy paper P introduced into the feeding reversing path 129 is provided. Cold air acts on the outer surface of the curved portion through the opening. Accordingly, the copy paper P introduced into the feed reversing path 129 is cooled at the outer surface of the curved portion, and contraction acting in the direction opposite to the curl direction is generated, thereby suppressing the occurrence of paper curl. The
[0018]
As described above, the copy paper advanced through the copy paper return path 154 is guided onto the receiving base 192 of the copy paper retransmitting means 190 and proceeds to the right on the receiving base 192 in FIG. In the illustrated embodiment, when a relatively long copy paper is returned through the copy paper return path 154, the swing member 171 is switched from the position indicated by the solid line in FIG. 1 to the position indicated by the two-dot chain line. Accordingly, a relatively long copy sheet is guided by the lower surface of the swing member 172 and received by the upper edge of the receiving protrusion 196, that is, the receiving table 192. When the intermediate length copy paper is returned through the copy paper return path 154, the swing member 178 is switched from the position indicated by the solid line in FIG. 1 to the position indicated by the two-dot chain line in FIG. Therefore, the copy paper having an intermediate length passes through the upper surface of the swinging member 172 and is then guided to the lower surface of the swinging member 178 so that the upper end edge of the receiving protrusion 196, that is, the receiving base 192 is received. On the other hand, when a relatively short copy sheet is returned, the swing members 172 and 178 are held at the positions indicated by the solid lines in FIG. Accordingly, at this time, the copy paper passes through the upper surfaces of the swing members 172 and 178 and is received by the receiving table 192 by the action of the return roller pair 176 and 182. When the copy paper is received by the receiving tray 192 and fed, the feeding roller 200 acts on the copy paper to feed the copy paper further to the right, and thus the leading edge of the copy paper is at the working position indicated by the solid line. It is brought into contact with the stop means 198 positioned. As a result, the progress of the copy paper is blocked and the copy paper is stopped at a required position on the copy paper re-sending means 190. Even if the feeding roller 200 is rotated at this time, a slip is generated between the feeding roller 200 and the copy paper, and the copy paper is not further advanced.
[0019]
As described above, when the required number of copy sheets are returned to the copy sheet re-sending means 190, the lower guide member 119 and the upper guide member 120 of the transport switching mechanism 114 are returned to the lowered position indicated by the solid line. Then, the stop means 198 in the copy paper retransmitting means 190 is positioned at the non-operating position indicated by the two-dot chain line, and the copy paper is transferred from the copy paper retransmitting means 190 by the action of the feed roller 200 driven to rotate in a predetermined direction. A resupply path 202 is sent out. The copy sheets sent to the copy sheet resupply path 202 are advanced one by one through the copy sheet resupply path 202 and supplied again to the copy sheet transport path 58. As can be easily understood by referring to FIG. 1, the front and back of such a copy paper is reversed by passing through a substantially semicircular copy paper refeeding path 202, and one side on which an image has already been formed is turned down. In this state, it is supplied to the copy paper conveyance path 58. Next, the copy paper is conveyed through a copy paper conveyance path 58. At this time, the toner image is transferred to the other surface, ie, the upper surface of the copy paper in the transfer area 18, and the toner image is fixed on the copy paper by the action of the heat fixing roller pair 108, and thus the image is formed on the other surface of the copy paper. It is formed. Next, the copy paper is introduced from the copy paper transport path 58 to the transport switching path 121 through the transport switching mechanism 114 between the upper roller 115 and the intermediate roller 116. At this time, the copy paper abuts on the guide portion 912 of the holding member 91 constituting the static eliminator 90 as described above to suppress paper curl, and is guided by the guide portion 912 and conveyed to the conveyance switching path 121. . During this time, the fiber brush 92 comes into contact with the copy paper, and static electricity charged on the copy paper is body-grounded to the machine body via the fiber brush 92, the holding member 91 and the fixing cover 93, and is eliminated. The copy paper conveyed to the conveyance switching path 121 as described above is discharged to the tray 126 by the discharge rollers 124 and 125. In this way, a copy having images formed on both sides is obtained.
[0020]
As mentioned above, although this invention was demonstrated based on the Example of illustration, this invention is not limited only to an Example. For example, in the illustrated embodiment, the present invention is applied to a double-sided copying machine. However, it goes without saying that the present invention may be applied to a copying machine that forms an image only on one side of a copy sheet. Absent.
[0021]
【The invention's effect】
The static eliminator of the electrostatic copying machine according to the present invention is configured as described above, and includes a holding member attached to the conductive attachment member and a fiber brush attached to the lower end portion of the holding member, and the holding member is electrically conductive. Since it is composed of a mounting portion fixed to the adhesive mounting member, and a guide portion that is connected to the lower end of the mounting portion and is inclined at a predetermined angle to the downstream side in the copying paper moving direction and is mounted with a fiber brush. When the toner image is transferred in the image transfer area and the toner image is fixed by the fixing device, the fiber brush of the static eliminator contacts the copy paper when moving on the copy paper conveyance path, and the static electricity charged on the copy paper is the fiber brush. Then, the body is grounded through the conductive mounting member through the holding member to be neutralized. Further, when the copy paper passes through the static eliminator, the copy paper abuts against the guide portion of the holding member to suppress paper curl and is guided and conveyed by the guide portion. As described above, the static eliminator of the electrostatic copying machine according to the present invention has a function of removing static electricity charged on the copy paper, and a conveyance guide function of the copy paper while suppressing the amount of paper curl generated on the copy paper after fixing. It comprises.
[Brief description of the drawings]
FIG. 1 is a sectional view schematically showing an embodiment of an electrostatic copying machine to which the present invention is applied.
2 is an enlarged cross-sectional view showing a mounting portion in which the static eliminator according to the present invention is applied to the electrostatic copying machine shown in FIG. 1;
3 is an enlarged perspective view of the static eliminator shown in FIG. 2. FIG.
[Explanation of symbols]
2: Housing
4: Stationary transparent plate
6: Document holding member
8: Rotating drum
22: Corona discharger for charging
24: Developing device
26: Corona discharger for transfer
28: Corona discharger for peeling
32: Residual toner removal blade
34: Optical system
36: Movable document illumination lamp
38: First movable reflector
40: Second movable reflector
42: Third movable reflector
44: Stationary lens assembly
46: Static reflector
48: Copy paper supply means
58: Copy paper transport path
80: Paper feed table mechanism
90: Static eliminator
91: Holding member
92: Fiber brush
93: Fixing cover
94: Fixing means
104: Conveyor belt mechanism
108: Heat fixing roller pair
114: Transport switching means
115: Upper roller
116: Intermediate roller
117: Lower roller
118: Transport roller mechanism
121: Transfer switching route
122: Copy paper discharge route
124: discharge roller
125: discharge roller
126: saucer
127: Feed reversing means
128: Copy paper return means
129: Feed reversal route
130: Outer guide plate
131: Inside guide plate
132: Opening
133: Reverse feed roller
135: Conveying roller
136: Reverse feed roller operating means
141: Solenoid
150: Return means
152: Return control means
154: Copy paper return path
190: Copy paper retransmission means
192: cradle
198: Stop means
200: Feed roller
202: Copy paper resupply path
204: Separation roller pair
208: Refeed roller pair
212: Refeed roller pair
216: Refeed roller pair
911: Wearing part
912: Guide section

Claims (1)

A conveyance roller and a discharge roller are disposed in the copy paper conveyance path downstream of the fixing device for fixing the toner image transferred to the copy paper in the image transfer area, and between the conveyance roller and the discharge roller. In the electrostatic copying machine provided with a return reversing means for switching the transported copy paper between the discharge roller side and the feed reverse path side, the copy paper transport between the transport roller and the discharge roller Affixed to the hanging portion of the fixing cover that is disposed to face the upper side of the fixing device and covers the upper side of the fixing device. A static eliminator for an electrostatic copying machine,
A holding member made of a conductive material having a mounting portion mounted on the hanging portion of the fixing cover, and a guide portion that is connected to the lower end of the mounting portion and is inclined at a predetermined angle; and A fiber brush that is attached to the tip of the guide portion so as to extend in the same direction as the guide portion, and the attachment portion is attached to the hanging portion of the fixing cover, and the downstream side of the copy paper moving direction. The fiber brush contacts the copy paper at an acute angle.
A static eliminator for an electrostatic copying machine.

Images