JP2007298811A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus which does not exert an unnecessary force to a paper sheet and does not give rise to unnecessary electrostatic charge by friction. <P>SOLUTION: The image forming apparatus has an image carrier 20 which forms and carries a clear image, a recording medium transfer means which transfers the toner image formed by the image carrier 20 to the recording medium, and a fixing device which imparts a heating and pressurizing effect to the recording medium and fixes the unfixed toner image to the recording medium. The image forming apparatus has a guide member 4-1 for guiding the recording medium holding the unfixed toner image between the transfer means and the fixing device, in which the guide member 4-1 is supported movably with respect to a conveyance course and the guide member 4-1 moves automatically during the image forming operation. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image forming apparatus having recording medium conveyance.

In an image forming apparatus using an electrophotographic system, after transferring a toner image on a photosensitive member to a sheet, the sheet for holding an unfixed toner image is transported to an image fixing apparatus while the sheet holding an unfixed toner image is conveyed to the fixing apparatus. The sheet could not be nipped and conveyed, and was easily affected by the disturbance of the paper behavior, and the disturbance of the paper behavior was likely to cause an abnormal image by affecting the unfixed toner image. This is because the linear velocity difference that occurs because the conveyance speed of the fixing roller and the upstream conveyance roller in the paper conveyance direction cannot be made completely the same speed adversely affects the behavior of the paper that holds the unfixed image. As described above, there are circumstances that cause abnormal images to be generated.
Conventionally, with respect to such a problem, by setting the conveyance speed by the fixing roller slightly slower than the conveyance speed of the conveyance means upstream in the conveyance direction, the linear velocity in the direction in which the deflection of the paper occurs on the upstream side of the fixing roller. By setting and further enlarging the conveyance path between the fixing roller and the transfer unit, the deflection of the sheet is absorbed, so that the influence on the behavior of the sheet is hardly affected. Since the conveyance guide plates can be arranged on both sides of the conveyance path except for the part that conveys the sheet holding the unfixed image, the sheet is guided on the conveyance path opposite to the side where the sheet bends and the sheet is bent. By separating the guide plate from the conveyance path, it was possible to achieve both sheet guide and deflection absorption.
However, in the conveyance section of the paper holding unfixed toner, the conveyance guide is limited to one side which is the non-image surface side. Therefore, in order to absorb the deflection in the conveyance path, the conveyance guide surface from the original paper conveyance path. Therefore, it is difficult to achieve both the sheet guide and the deflection absorption.

Therefore, in Patent Document 1, a transfer unit that transfers a toner image on a photoreceptor to a sheet, a transfer conveyance unit that conveys a sheet that holds an unfixed toner image, and a heating and pressing action are applied to the sheet. An image forming apparatus comprising: a fixing unit that fixes the unfixed toner image on the sheet; and a guide member that is positioned between the transfer unit and the fixing unit and guides the sheet holding the unfixed toner image. An image forming apparatus characterized in that a guide member is rotatably supported is disclosed. Thus, an image forming apparatus that can absorb the deflection generated by the sheet between the transfer unit and the fixing unit, stabilize the behavior of the sheet holding the unfixed toner image, and suppress the occurrence of an abnormal image. Could be provided.
However, in the above invention, since the movement of the transport path is performed by the bending force of the sheet itself, the reaction force may adversely affect the nip portion of the transfer device and the fixing device. Further, while the guide plate is being moved while being bent, the paper is rubbed and conveyed all the time, and there is a concern that abnormal images such as image dust due to frictional charging may occur, and improvement has been desired.

JP 2001-335184 A

  Accordingly, the present invention has been made in view of the above-described problems, and a problem thereof is to provide an image forming apparatus that does not apply unnecessary force to a sheet and that does not generate unnecessary charging due to friction. is there.

The features of the present invention, which is a means for solving the above problems, are listed below.
The present invention provides an image carrier for forming and carrying a visible image, a recording medium transfer device for transferring a toner image formed by the image carrier to a recording medium, and applying a heating and pressing action to the recording medium. And an image forming apparatus having a fixing device for fixing an unfixed toner image to the recording medium,
Between the transfer device and the fixing device, there is a guide member for guiding the recording medium holding an unfixed toner image, the guide member is supported so as to be movable with respect to the transport path, and an image In the image forming apparatus, the guide member is automatically moved during the forming operation.
According to the present invention, the timing of the automatic movement of the guide member is after the leading edge of the recording medium has entered the fixing device nip portion, and the moving direction of the guide plate is determined according to whether the recording medium is a transfer device or a fixing device. The recording medium posture when sandwiched in the nip portion is a convex direction.
According to the present invention, when the guide member automatically moves when the leading edge of the recording medium enters the fixing device nip portion and the recording medium is sandwiched between the nip portions of the transfer device and the fixing device. The recording medium has a plurality of convex shapes such as an S-shape, and the guide plate moves in a direction upstream of the nip portion when the recording medium is sandwiched only in the fixing device nip portion. It is a direction in which the rear end of the recording medium faces.
The present invention is characterized in that the timing of the automatic movement of the guide member is before the leading edge of the recording medium enters the transfer device nip, and the moving direction of the guide plate is a direction approaching the transfer device. To do.
The present invention is characterized in that the movable guide member is brought into contact with a rotating cam with pressure, and the amount of movement of the guide member is determined by the amount of rotation of the cam.
The present invention is characterized in that the amount of movement of the guide member and the stationary position are made variable according to information on a transfer sheet as a recording medium included in the image forming apparatus main body or the printer driver.
The present invention is characterized in that the guide member has a stable sheet separation at the transfer device outlet.
The present invention is characterized in that a neutralizing needle is disposed on the guide member to neutralize the sheet by applying a neutralizing bias.
The present invention is characterized in that a static elimination needle connected to the ground is disposed on the guide member.
The present invention is a laser beam printer.
The present invention is characterized by being a facsimile.
Note that “automatically move” means that the guide plate itself operates as a mechanical mechanism instead of moving by receiving a force from the paper.

  According to the present invention, it is possible to provide an image forming apparatus that does not apply unnecessary force to a sheet and that does not generate unnecessary charging due to friction.

  The best mode for carrying out the present invention will be described below with reference to the drawings. Note that it is easy for a person skilled in the art to make other embodiments by changing or correcting the present invention within the scope of the claims, and these changes and modifications are included in the scope of the claims. The following description is an example of the best mode of the present invention, and does not limit the scope of the claims.

A process for obtaining a color image will be described. FIG. 1 is a diagram illustrating a color image forming apparatus. In FIG. 1, a color image forming apparatus includes a transfer belt unit 10 having an intermediate transfer belt 11 and four image stations. Each image station has an image carrier (hereinafter referred to as a photosensitive drum) 20Y. , 20C, 20M, and 20Bk, respectively, and there are dedicated charging devices 30Y, 30C, 30M, and 30Bk, developing devices 50Y, 50C, 50M, and 50Bk, and cleaning devices 40Y, 40C, 40M, and 40Bk. is doing.
A toner bottle 9 for supplying toner is filled with yellow (Y), cyan (C), magenta (M), and black (Bk) toners from the left in the figure. The developing devices 50Y, 50C, 50M, and 50Bk of the respective colors are replenished by a predetermined replenishment amount through the conveyance path that is not performed.

Regarding the operation, the transfer paper 2 as a recording medium is fed from the paper feed cassette 1 by the paper feed roller 3, and when the leading edge of the transfer paper 2 reaches the registration roller pair 4, it is detected by a sensor (not shown). The transfer sheet 2 is conveyed to the nip portion between the secondary transfer roller 5 and the intermediate transfer belt 11 by the registration roller pair 4 while taking a timing with this detection signal.
The photosensitive drums 20Y, 20C, 20M, and 20Bk, which are uniformly charged in advance by the charging devices 30Y, 30C, 30M, and 30Bk, are exposed and scanned with laser light by the optical writing device 8, and the photosensitive drums 20Y, 20Y, An electrostatic latent image is created on 20C, 20M, and 20Bk.
Each electrostatic latent image is developed by each color developing device 50Y, 50C, 50M, and 50Bk, and a yellow, cyan, magenta, and black toner image is formed on the surface of the photosensitive drum 20Y, 20C, 20M, and 20Bk. The

Next, a voltage is applied to the primary transfer rollers 12Y, 12C, 12M, and 12Bk, and the toner on the photosensitive drums 20Y, 20C, 20M, and 20Bk is sequentially transferred onto the intermediate transfer belt 11. At this time, the image forming operation for each color is executed while shifting the timing from the upstream side toward the downstream side so that the toner image is transferred to the same position on the intermediate transfer belt 11.
The image formed on the intermediate transfer belt 11 is conveyed to the position of the secondary transfer roller 5 and is secondarily transferred to the transfer paper 2. The transfer paper 2 onto which the toner images of the respective colors have been transferred is conveyed to the fixing device 6 and thermally fixed, and is discharged by a paper discharge roller 7.
The residual toner on the photosensitive drums 20Y, 20C, 20M, and 20Bk is cleaned by the respective cleaning devices 40Y, 40C, 40M, and 40Bk, and then a bias of an AC component is applied to the DC in a superimposed manner. The electrification devices 30Y, 30C, 30M, and 30Bk are charged simultaneously with static elimination to prepare for the next imaging. The residual toner on the intermediate transfer belt 11 is cleaned by the intermediate transfer belt cleaning device 13 to prepare for the next image forming process.

FIG. 2 is a diagram illustrating the developing device. The developing device 50 regulates the developing case 55 having an opening, the developing roller 51 disposed so as to face the surface of the photosensitive drum 20 and the developer on the developing roller 51 to a certain height. The developing blade 52, the first conveying screw 53, the second conveying screw 54, and the like disposed at positions facing the developing roller 51 are configured.
The cleaning device 40 also includes a cleaning case 43 having an opening, a cleaning blade 41 for cleaning residual toner on the photosensitive drum 20, and a cleaned waste toner. A waste toner screw 42 for conveying to a waste toner bottle (not shown) is formed.
The transfer belt unit 10 includes an intermediate transfer belt 11, a primary transfer roller 12 for transferring a toner image on the photosensitive drum 20 to the intermediate transfer belt 11, and an intermediate transfer belt case for holding these components. 14 etc.
Reference numeral 30 denotes a charging roller as a charging device, 31 denotes a cleaning roller of the charging roller, and L denotes laser light from the optical writing device 8.

Next, the fixing device 6 will be described. FIG. 3 is a schematic configuration diagram illustrating an example of a fixing device, in which a fixing belt 69, a fixing roller 61, a heating roller 63, and a pressure roller 60 are used as a pressure member. Is the case. In the fixing device 6, an endless fixing belt 69 is wound around a heating roller 63 and a fixing roller 61. The heating roller 63 incorporates heating means such as a halogen lamp 65 in a metal core, and the fixing belt 69 is heated from the inside via the heating roller 63 by this radiant heat. At this time, the fixing roller 61 and the pressure roller 60 are rollers having a silicone rubber on a metal core. The heating roller 63 is an aluminum or iron hollow roller. The fixing belt 69 has a silicone rubber layer and a release layer on a polyimide or nickel base material.
In addition, for example, a thermistor 70, which is a temperature sensor element, is disposed in the heating roller 63 via a belt, and heating means is provided so as to reach the set temperature based on the temperature detection of the thermistor 70. I have control. Further, a pressure roller 60 is provided that pressurizes the fixing roller 61 with a biasing means (not shown) such as a spring through the fixing belt 69. Further, the pressure roller 60 is rotated by a driving means (not shown), whereby the fixing roller 61 is driven to rotate. Further, the fixing device 6 is provided with a tension roller 66 that contacts the vicinity of the center portion of the fixing belt 69. The tension roller 66 pressurizes the fixing belt 69 inward by a spring, whereby a tension is applied to the fixing belt 69. In this embodiment, the driving means is provided in the pressure roller 60, but the pressure roller 60 may be driven and rotated in the fixing roller 61. Further, a separation member 62 is provided on the downstream side of the fixing nip in the sheet conveying direction so that the sheet does not wind around the fixing belt 69. A guide member is disposed at a position facing the separating member 62 and guides the sheet after the fixing nip to the downstream side together with the separating member 62.

FIG. 4 is a schematic diagram of an image forming apparatus having a facsimile function. An image forming unit 101 is disposed at the center of the image forming apparatus, and a paper feeding unit 102 is disposed immediately below the image forming unit 101. A plurality of paper feed units 102 are provided, each having a paper feed tray 1. Above the image forming unit 101, a reading unit 103 for reading a document is disposed. A paper discharge storage unit 104 is formed on the left side of the image forming unit 101, and the sheet 2 on which the image is formed is discharged and stored.
An image forming unit 106 is disposed in the image forming unit 101. Around the drum-shaped photoconductor 20, a charging unit 162 that performs charging processing on the surface, an exposure unit 8 that irradiates image information with laser light on the surface, A developing unit 50 for visualizing an electrostatic latent image formed by exposure on the surface, and a cleaning unit 40 for removing and collecting the toner remaining on the photoreceptor 20 are disposed. In addition, the transfer unit 151 that transfers the toner image formed on the photoconductor 20 to the sheet 2 and the toner on the sheet from which the toner image is obtained pass between a pair of rollers and heat and pressure are applied to form the toner image. Fixing sections 6 for fixing processing are respectively arranged. The sheet that has passed through the fixing unit 6 is discharged to the discharge storage unit 104 by the discharge roller 7.

At the time of double-sided printing, the paper is branched by the branching unit 91, the paper 2 is reversed by the reversing double-sided part 109 and conveyed to the registration roller 4, the skew of the paper 2 is corrected by the registration roller 4, and the back side image forming operation is performed.
In the paper supply unit 102, unused paper 2 is stored in the paper supply tray 1, and the bottom plate 124 that is rotatably supported raises the uppermost paper 2 to a position where the pickup roller 125 can contact. As the paper feed roller 3 rotates, the uppermost paper is sent out from the paper feed tray 1 and conveyed to the registration roller 4.
The registration roller 4 is controlled so as to start rotation at a timing so that the conveyance of the paper 2 is temporarily stopped and the positional relationship between the toner image on the surface of the photoconductor 20 and the front end of the paper 2 is a predetermined position.

  In the reading unit 103, in order to perform reading scanning of the document placed on the contact glass 131, the reading traveling bodies 132 and 133 including the document illumination light source and the mirror reciprocate. The image information scanned by the reading traveling bodies 132 and 133 is read as an image signal into the CCD 135 installed behind the lens 134. The read image signal is digitized and image processed by an image processing unit 150 (not shown). In the image forming unit 101, an electrostatic latent image is formed on the surface of the photoconductor 20 by light emission of a laser diode LD (not shown) in the exposure unit 8 based on the image signal processed by the image processing unit 150. . The optical signal from the LD reaches the photoconductor 20 via a known polygon mirror or lens. Above the reading unit 103, an automatic document feeder 100 that automatically feeds a document is attached.

The image forming apparatus according to the present embodiment, in addition to the function of a so-called digital copier that reads and digitizes a document and copies it onto a sheet as described above, converts image information of the document from a remote location by a control unit 110 (not shown). This is a multi-function image forming apparatus having a function of a fax machine for sending and receiving and a so-called printer function for printing image information handled by a computer on paper. The setting as the copying machine is performed by an operation unit that can be arbitrarily set by the user. Further, all images formed by any function are discharged to the paper discharge storage unit 104.
When the paper is branched by the branching claw 91 and reversed through the reverse double-sided portion 109 and discharged from the paper discharge roller 7 via the reverse paper discharge roller 154, the paper stacked in the paper discharge storage portion 104 is When the image side is the bottom side and the processing order of documents handled by copying, facsimile, and printer is printed from the first page, the first page is the top when taken out from the paper discharge storage unit 104 It is freed from work such as aligning pages again.
The image forming apparatus of the present invention performs image alignment with respect to the sheet 2, and detects the edge of the sheet by the sheet position detecting unit 201 disposed on the upstream side of the conveyance of the image forming unit 101. Thus, image formation is performed on the sheet 2.

5 to 7 are enlarged views of the vicinity of the transfer device and the fixing device in FIG. A guide plate 4-1 is disposed between the transfer device and the fixing device 6 as a guide member for guiding the transfer paper 2 holding an unfixed toner image, with the guide plate fulcrum 4-4 as a fulcrum. ing. The guide plate 4-1 is pressed against the moving cam 4-3 by a tension spring 4-2. When the moving cam 4-3 rotates, the guide plate 4-1 moves with the guide plate fulcrum 4-4 as a fulcrum as shown in FIGS. The amount of movement and the stationary position of the guide plate 4-1 are determined by the amount of rotation of the movable cam 4-3. The amount of movement and the stationary position are determined by information on the transfer paper 2 held by the printer body or printer driver. It is variable. At this time, as shown in FIGS. 5 and 6, the vicinity of the entrance of the fixing device 6 of the guide plate 4-1 is fixed separately from the movable portion, and the sheet behavior in the vicinity of the fixing is always kept constant. It has a configuration that droops.
When the transfer paper 2 exits the secondary transfer roller 5, the guide plate 4-1 is stationary at a position that guides the ideal locus of the leading edge of the transfer paper 2 after the transfer exit. After the leading edge of the transfer paper 2 enters the fixing nip, the guide plate 4-1 moves to a position that does not hinder the behavior of the transfer paper 2 that bends between the transfer portion and the fixing portion.

  FIG. 7 is an example of an enlarged view of the vicinity of the transfer device and the fixing device. In this example, the nip directions of the transfer device and the fixing device 6 are both leftward in the drawing, and the transfer paper 2 that straddles both nips of the transfer portion and the fixing portion is S-shaped as shown in FIG. The movable guide plate 4-1 has a guide plate in a direction (right direction in the figure) in which the rear end of the sheet upstream of the fixing nip portion faces when the transfer paper 2 is sandwiched only in the fixing device nip portion. The fulcrum 4-4 serves as a fulcrum and is arranged to be freely rotatable. As in the previous example, the guide plate 4-1 is pressed against the moving cam 4-3 by a tension spring 4-2. When the movable cam 4-3 rotates, the guide plate 4-1 moves with the guide plate fulcrum 4-4 as a fulcrum, and the conveyance path is variable. At this time, the vicinity of the entrance of the fixing device 6 of the guide plate 4-1 is fixed separately from the movable portion, and the sheet behavior in the vicinity of the fixing is kept constant. Further, the neutralization needle 4-5 is arranged at the end of the guide plate 4-1 on the transfer portion side, and is optimal for each condition depending on the information of the transfer sheet 2 held by the printer main body or the printer driver. The neutralizing needle position is determined by the amount of rotation of the movable cam 4-3. In addition, the optimum static elimination needle position can be adjusted also by changing the stationary position of the guide plate 4-1 according to the rotation amount of the moving cam 4-3 depending on the sheet conveyance timing. As described above, by disposing the static elimination needle on the movable guide plate, it is possible to change the static elimination position of the transfer outlet according to the conveyance timing of the paper and the type of the paper.

  Thus, when the leading edge of the paper enters the fixing device, the shape of the transfer path between the transfer and the fixing after the leading edge of the paper enters the fixing device is made variable, and the leading edge of the paper enters the fixing device in an optimal posture. For this reason, by forming a transfer path between transfer and fixing, it is possible to stabilize the paper behavior after entering the fixing device and suppress the occurrence of abnormal images. In addition, by creating a space in the transport path between the transfer device and the fixing device that does not hinder the deflection of the generated paper, it is possible to stabilize the behavior of the paper and suppress the occurrence of abnormal images. . Furthermore, it is possible to form a transport path that takes into consideration only the transport path at the leading edge of the paper from the transport path that had to be considered up to the space for the paper to be bent up to now. It is possible to form a conveyance path that is resistant to variations in the sheet conveyance speed between transfer and fixing due to variations in the sheet conveyance speed of the fixing device, a decrease in conveyance speed due to deterioration of the fixing device over time, and slip due to sheet surface properties. In addition, it is possible to prevent the unfixed image on the paper from being disturbed by fluttering and coming into contact with the guide member or other parts after the trailing edge of the paper passes through the transfer device by widening the conveyance space.

The present invention can form an optimum exit guide shape of the transfer outlet when the leading edge of the sheet passes through the transfer nip portion and is guided by the guide member.
Further, by adjusting the movement amount using the rotating cam, the guide member position can be determined steplessly within the set movement width. Furthermore, since the guide member is moved only by sliding with the cam, no shock is generated during operation, and an abnormal image such as a shock jitter is generated in the image being formed. Can be eliminated. As a method for bringing the guide member into contact with the cam with pressure, an elastic body such as a tension spring or a leaf spring is used.
Depending on the difference in conditions such as the paper size, thickness, and weight, the optimal conveyance path of the leading edge of the sheet to the fixing device nip and the conveyance space necessary for the sheet to bend change. Therefore, according to the present invention, an optimal image can be obtained regardless of the paper type by assigning an optimal guide member position to each of the paper types to be conveyed.

It is a figure which shows a color image forming apparatus. It is a figure which shows a developing device. FIG. 2 is a schematic configuration diagram illustrating an example of a fixing device. 1 is a schematic diagram of an image forming apparatus having a facsimile function. FIG. 4 is an enlarged view of the vicinity of a transfer device and a fixing device. FIG. 4 is an enlarged view of the vicinity of a transfer device and a fixing device. FIG. 4 is an enlarged view of the vicinity of a transfer device and a fixing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper feed cassette 2 Transfer paper 3 Paper feed roller 4 Registration roller pair 4-1 Guide plate 4-2 Tension spring 4-3 Moving cam 4-4 Guide plate fulcrum 4-5 Static elimination needle 5 Secondary transfer roller La 6 Fixing device (fixing part)
7 Paper discharge roller 8 Optical writing device (exposure unit)
9 toner bottle 10 transfer belt unit 11 intermediate transfer belt 12Y, 12C, 12M, 12Bk primary transfer roller 13 intermediate transfer belt cleaning device 14 intermediate transfer belt case 20Y, 20C, 20M, 20Bk image carrier (photosensitive Body drum)
30Y, 30C, 30M, 30Bk Charging device (charging roller)
31 Charging Roller Cleaning Roller 40Y, 40C, 40M, 40Bk Cleaning Device (Cleaning Unit)
41 Cleaning blade 42 Waste toner screw 43 Cleaning case 50Y, 50C, 50M, 50Bk Developing device (developing part)
51 Developing Roller 52 Developing Blade 53 First Conveying Screw 54 Second Conveying Screw 55 Developing Case 60 Pressure Roller 61 Fixing Roller 62 Separating Member 63 Heating Roller 65 Halogen Lamp 66 Tension Rolling -La 69 Fixing belt 70 Thermistor 91 Branch unit 100 Automatic document feeder 101 Image forming unit 102 Paper feed unit 103 Reading unit 104 Paper discharge storage unit 106 Image forming unit 109 Reversed both sides 124 Bottom plate 125 Pickup roller 131 Contact glass 132 Reading traveling body 133 Reading traveling body 134 Lens 135 CCD
151 Transfer Unit 154 Reversed Discharge Roller 162 Charging Unit 201 Paper Position Detection Means L Laser Light

Claims (11)

An image carrier that forms and carries a visible image; and
A recording medium transfer device for transferring a toner image formed by the image carrier to a recording medium;
A fixing device that applies a heating and pressurizing action to the recording medium and fixes an unfixed toner image on the recording medium;
In an image forming apparatus having
The image forming apparatus includes:
A guide member for guiding the recording medium holding an unfixed toner image between the transfer device and the fixing device;
The guide member is supported so as to be movable with respect to the transport path,
An image forming apparatus wherein the guide member automatically moves during an image forming operation. The image forming apparatus according to claim 1.
The image forming apparatus includes:
The timing of the automatic movement of the guide member is after the leading edge of the recording medium enters the fixing device nip portion,
2. An image forming apparatus according to claim 1, wherein the moving direction of the guide plate is a direction in which the posture of the recording medium becomes convex when the recording medium is sandwiched between nip portions of the transfer device and the fixing device. The image forming apparatus according to claim 1.
The image forming apparatus includes:
The timing of the automatic movement of the guide member is after the leading edge of the recording medium enters the fixing device nip portion,
The recording medium posture when the recording medium is sandwiched between the nip portions of the transfer device and the fixing device has a plurality of convex shapes such as an S-shape,
The image forming method is characterized in that the moving direction of the guide plate is a direction in which the rear end of the recording medium upstream from the nip portion is facing when the recording medium is sandwiched only in the fixing device nip portion. apparatus. The image forming apparatus according to claim 1.
The image forming apparatus includes:
The timing at which the guide member automatically moves is before the recording medium leading edge enters the transfer device nip,
An image forming apparatus, wherein a moving direction of the guide plate is a direction approaching the transfer device. The image forming apparatus according to claim 1,
The image forming apparatus includes:
The movable guide member is brought into contact with the rotating cam with pressure,
An image forming apparatus, wherein the amount of movement of the guide member is determined by the amount of rotation of the cam. The image forming apparatus according to any one of claims 1 to 5,
The image forming apparatus includes:
An image forming apparatus, wherein the amount of movement of the guide member and the stationary position are variable according to information on a transfer sheet as a recording medium included in the image forming apparatus main body or a printer driver. The image forming apparatus according to any one of claims 1 to 6,
The image forming apparatus includes:
An image forming apparatus, wherein the guide member has stable sheet separation at an exit of a transfer device section. The image forming apparatus according to any one of claims 1 to 7,
The image forming apparatus includes:
An image forming apparatus, wherein a neutralizing needle for neutralizing a sheet by applying a neutralizing bias to the guide member is disposed. The image forming apparatus according to claim 1,
The image forming apparatus includes:
An image forming apparatus, wherein a neutralizing needle connected to an earth is disposed on the guide member. The image forming apparatus according to claim 1,
The image forming apparatus includes:
An image forming apparatus which is a laser beam printer. The image forming apparatus according to claim 1,
The image forming apparatus includes:
An image forming apparatus characterized by being a facsimile.

Images