Image forming apparatus

Abstract

To achieve cost reduction by reducing the number of sensors for detecting occurrence of a paper jam and an attitude of a branch guide.SOLUTION: An image forming apparatus 1 includes an image forming unit 13, a fixing unit 14, a first conveying path 113, a second transport path 114, an actuator 20, a branch guide 40, a lever member 60, and a detection sensor 80. When the detection sensor 80 outputs an ON signal before image formation by the image forming unit 13, a control unit 10 causes the branch guide 40 to perform a change operation to change from a second guiding position to a first guiding position, and when the detection sensor 80 still outputs the ON signal when the changing operation is completed, the control unit causes a notification screen indicating that paper P is present on the first conveying path 113 to be displayed on a display unit 16.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an image forming apparatus, and more particularly to a technique for detecting the occurrence of a paper jam and the attitude of a branch guide. [Background technology]

[0002] In a general image forming apparatus, there are known techniques for detecting the occurrence of a paper jam and the position of a branch guide. For example, Patent Document 1 discloses a technique in which, when a paper jam is detected, it is determined whether or not the branch guide plate is located at the home position, and if it is located at the home position, a message is displayed indicating that a jam has occurred, and if it is not located at the home position, the branch guide plate is moved to the home position and a message is displayed indicating that a jam has occurred. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-35148 Summary of the Invention [Problem to be solved by the invention]

[0004] However, to realize the technology disclosed in Patent Document 1, a sensor for detecting a paper jam and a sensor for detecting that the branch guide plate is located at the home position are required. Image forming devices are equipped with many sensors to realize various functions, and there is a problem in that the installation of these sensors increases costs.

[0005] The present invention has been made in view of the above circumstances, and aims to achieve cost reduction by reducing the number of sensors for detecting the occurrence of paper jams and the position of the branch guide.

[0006] An image forming apparatus according to one aspect of the present invention includes an image forming unit that forms an image on a sheet of paper, a fixing unit that fixes the image on the sheet of paper, and a first conveying path that extends from the fixing unit to an ejection port. The sheet conveying device includes a second conveying path branching off from the first conveying path and extending toward the image forming unit; a branch guide that takes a first guiding position when guiding paper to the first conveying path and a second guiding position when guiding paper to the second conveying path; a paper contact member that takes a non-contacting position when not in contact with paper on the first conveying path and a contacting position when in contact with paper on the first conveying path; a detection target member that takes a first detection position when the branch guide takes the first guiding position and a second detection position when the branch guide takes the second guiding position, and that takes the first detection position when the paper contact member takes the non-contacting position and the second detection position when the paper contact member takes the contacting position; and a sensor that outputs a first signal when the detection target member is in the first detection position and a second signal when the detection target member is in the second detection position. [Effects of the Invention]

[0007] According to the present invention, the presence or absence of paper on the first transport path and the position of the branch guide can be detected with one sensor. Therefore, compared to the case where separate sensors are provided to detect the occurrence of a paper jam and the position of the branch guide, the number of sensors can be reduced, thereby achieving cost reduction. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a structure of an image forming apparatus. [Figure 2] FIG. 1 is a block diagram showing a configuration of an image forming apparatus. [Figure 3] FIG. 4 is a partially enlarged view showing the periphery of the fixing unit. [Figure 4] FIG. 4 is a partially enlarged view showing the periphery of the fixing unit. [Figure 5] FIG. 4 is a partially enlarged view showing the periphery of the fixing unit. [Figure 6] 10 is a flowchart illustrating an abnormality detection process. DETAILED DESCRIPTION OF THE INVENTION

[0009] An image forming apparatus according to one embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a cross-sectional view showing the structure of image forming apparatus 1 according to one embodiment of the present invention. Fig. 2 is a block diagram showing the configuration of image forming apparatus 1. Figs. 3 to 5 are partial enlarged views showing the periphery of fixing unit 14 provided in image forming apparatus 1.

[0010] [Device configuration] 1, the image forming apparatus 1 is a tandem color printer. A housing 11 of the image forming apparatus 1 houses a paper feed unit 12, an image forming unit 13, and a fixing unit .

[0011] A paper transport path 111 is formed inside the housing 11, extending from the paper feed unit 12 through the image forming unit 13 to the fixing unit 14. A transport roller pair 112 is provided at an appropriate position on the paper transport path 111. The transport roller pair 112 transports the paper P along the paper transport path 111.

[0012] Further formed within the housing 11 are a first conveying path 113 extending from the fixing section 14 to the discharge outlet 153, and a second conveying path 114 branching off from the first conveying path 113 and joining the paper conveying path 111 upstream of the image forming section 13 in the paper conveying direction.

[0013] The paper feed unit 12 includes a paper feed tray 121, a pickup roller 122, and a pair of paper feed rollers 123. The pickup roller 122 pulls out the paper sheets P stored in the paper feed tray 121 one by one. The pair of paper feed rollers 123 sends out the paper sheets P pulled out by the pickup roller 122 to the paper transport path 111.

[0014] The image forming section 13 forms an image composed of a toner image on a sheet of paper P. The image forming section 13 includes image forming units 131M, 131C, 131Y, and 131K, an intermediate transfer belt 132, a primary transfer roller 133, and a secondary transfer roller .

[0015] Image forming units 131M, 131C, 131Y, and 131K correspond to the colors magenta, cyan, yellow, and black, respectively. Each of image forming units 131M, 131C, 131Y, and 131K includes a photosensitive drum 135, and forms a toner image on photosensitive drum 135 using a developer corresponding to each color through the processes of charging, exposing, developing, and transferring.

[0016] The intermediate transfer belt 132 is stretched over a drive roller 136 and a driven roller 137. The intermediate transfer belt 132 is rotated in accordance with the rotation of the drive roller 136. The driven roller 137 is rotated in accordance with the rotation of the intermediate transfer belt 132.

[0017] The primary transfer rollers 133 are disposed in positions facing each photosensitive drum 135 across the intermediate transfer belt 132. The primary transfer rollers 133 are rotated in accordance with the rotation of the intermediate transfer belt 132. The primary transfer rollers 133 perform primary transfer of the toner images formed on the photosensitive drums 135 onto the intermediate transfer belt 132.

[0018] The secondary transfer roller 134 performs a second transfer of the toner image on the intermediate transfer belt 132 onto the paper P fed from the paper feed unit 12. The secondary transfer roller 134 is disposed in a position facing the drive roller 136 across the intermediate transfer belt 132. The secondary transfer roller 134 is rotated in accordance with the rotation of the intermediate transfer belt 132.

[0019] The fixing unit 14 includes a pressure roller 141 and a fixing roller 142. The pressure roller 141 rotates around its axis by receiving driving force from a drive motor. The fixing roller 142 includes a fixing belt and a heater. The fixing belt is a substantially cylindrical endless belt rotatably supported by a shaft. The heater is provided inside the fixing belt so as to contact the inner circumferential surface of the fixing belt.

[0020] The fixing roller 142 is pressed against the pressure roller 141 by a pressing member to form a nip portion. While being pressed against the pressure roller 141, the fixing roller 142 is rotated in accordance with the rotation of the pressure roller 141. The fixing unit 14 heats and presses the paper P onto which the toner image has been transferred in the nip portion, thereby fixing the toner image to the paper P. As a result, a full-color image is formed on the paper P.

[0021] The image forming apparatus 1 further includes a paper discharge tray 151 and a discharge roller 152 shown in FIG. 3. The discharge roller 152 receives a driving force from a drive motor and rotates around its axis. In this embodiment, the pressure roller 141 and the discharge roller 152 are connected to the same drive motor. The discharge roller 152 discharges the paper P on which the full-color image has been formed from a discharge port 153 to the paper discharge tray 151.

[0022] 3, the paper P on which the full-color image has been formed is sorted into the first conveying path 113 or the second conveying path 114. For example, when an image is formed on only one side of the paper P, the branching guide 40 guides the paper P that has passed through the fixing unit 14 into the first conveying path 113, and the discharge roller 152 discharges the paper P to the paper discharge tray 151.

[0023] On the other hand, when an image is formed on both sides of the paper P, the branching guide 40 guides the paper P, which has passed through the fixing unit 14 and has an image formed on its front side, to the first transport path 113, and the discharge rollers 152 discharge a portion of the paper P to the outside of the device. In this state, when the discharge rollers 152 rotate in the reverse direction and the paper P switches back, the branching guide 40 guides the paper P to the second transport path 114 and sends it out toward the junction with the paper transport path 111. The image forming unit 13 forms an image on the back side of the paper P, which is transported again along the paper transport path 111. The branching guide 40 guides the paper P, which has passed through the fixing unit 14 again, to the first transport path 113, and the discharge rollers 152 discharge the paper P to the paper output tray 151.

[0024] 2, the image forming apparatus 1 includes a control unit 100. The control unit 100 includes a processor, a random access memory (RAM), and a read only memory (ROM). The processor is, for example, a central processing unit (CPU), a micro processing unit (MPU), or an application specific integrated circuit (ASIC).

[0025] The control unit 100 is electrically connected to the paper feed unit 12, the image forming unit 13, the fixing unit 14, the display unit 16, the operation unit 17, the HDD (Hard Disk Drive) 18, and the communication unit 19. The control unit 100 functions as the control unit 10 when various computer programs stored in the built-in ROM or the HDD 18 are executed by the above-mentioned processor.

[0026] The control unit 10 performs overall control of the image forming apparatus 1. Note that the control unit 10 may be configured to be operable by a logic circuit rather than by operation based on a computer program, or may be configured to be realized by two or more control units.

[0027] The display unit 16 is a display device configured by a liquid crystal display or an organic light-emitting diode (EL) display. The display unit 16 displays various screens for the functions that can be executed by the image forming apparatus 1.

[0028] The operation unit 17 includes a plurality of hard keys. The operation unit 17 includes a touch panel that is placed on top of the display unit 16. A user's instructions are input to the operation unit 17. The operation unit 17 may also include soft keys that are displayed on the display unit 16.

[0029] The HDD 18 stores various data including various computer programs for realizing the operations of the image forming apparatus 1. In this embodiment, the HDD 18 stores a detection program for executing an abnormality detection process.

[0030] The communication unit 19 includes a communication module such as a LAN (Local Area Network) board. The control unit 10 performs data communication via the communication unit 19 with an external device such as a PC (Personal Computer) connected via a network.

[0031] A power supply is connected to each part of the image forming apparatus 1. When a user turns on the power supply, power is supplied to each part of the image forming apparatus 1 from the power supply.

[0032] Next, the configuration around the fixing unit 14 will be described in detail with reference to Fig. 3 to Fig. 5. Fig. 3 is a diagram showing the state before image formation, Fig. 4 is a diagram showing the state when paper passes through the first conveying path 113, and Fig. 5 is a diagram showing the state when paper passes through the second conveying path 114.

[0033] As shown in FIG. 3, the image forming apparatus 1 includes an actuator 20, a branch guide 40, a lever member 60, and a detection sensor 80 in the vicinity of the fixing unit 14.

[0034] The actuator 20 includes a rotating shaft 22, a first contact piece 24, and a second contact piece 26. The rotating shaft 22 is rotatably supported above the fixing unit 14. The first contact piece 24 protrudes from the rotating shaft 22 in a direction perpendicular to the axial direction of the rotating shaft 22. The second contact piece 26 protrudes from the rotating shaft 22 in a direction perpendicular to the axial direction of the rotating shaft 22, but in a direction different from the protruding direction of the first contact piece 24 (here, a direction forming an angle of approximately 120° clockwise on the page with respect to the first contact piece 24).

[0035] The actuator 20 is a paper contact member that takes a non-contact position when not in contact with the paper P on the first transport path 113, and takes a contact position when in contact with the paper P on the first transport path 113. Specifically, when there is no paper P in the first transport path 113, the actuator 20 takes a non-contact position in which the first contact piece 24 is located on the first transport path 113, as shown in Figures 3 and 5. When there is paper P in the first transport path 113, the first contact piece 24 comes into contact with the paper P on the first transport path 113, as shown in Figure 4, and the actuator 20 rotates clockwise on the paper surface with the rotation shaft 22 as a fulcrum to take a contact position.

[0036] The branch guide 40 includes a rotating shaft 42, a guide member 44, and a contact member 46. The rotating shaft 42 is rotatably supported above the fixing unit 14. The guide member 44 protrudes from the rotating shaft 42 so that the longitudinal direction of the guide member 44 is along the axial direction of the rotating shaft 42. The contact member 46 protrudes from the rotating shaft 46 in a direction that is perpendicular to the axial direction of the rotating shaft 42 and different from the direction in which the guide member 44 protrudes from the rotating shaft 42 (here, a direction that forms an angle of approximately 180° counterclockwise in the plane of the drawing with respect to the guide member 44).

[0037] 3 and 4, when guiding the paper P to the first transport path 113, the branch guide 40 takes a first guiding position in which a first surface 44A of the guide member 44 forms part of the first transport path 113. When guiding the paper P to the second transport path 114, the branch guide 40 takes a second guiding position in which a second surface 44B opposite to the first surface 44A of the guide member 44 forms part of the second transport path 114, as shown in FIG.

[0038] The control unit 10 operates the solenoid provided in the branch guide 40 in the forward direction for a predetermined movement time (in this case, 120 milliseconds), causing the branch guide 40 to rotate counterclockwise on the paper surface with the rotation axis 42 as a fulcrum, thereby changing the branch guide 40 from the first guiding position to the second guiding position.

[0039] The lever member 60 includes a rotating shaft 62, a contact piece 64, and a detection piece 66 as a member to be detected. The rotating shaft 62 is rotatably supported on the side of the fixing unit 14. The contact piece 64 protrudes from the rotating shaft 62 in a direction perpendicular to the axial direction of the rotating shaft 62. The detection piece 66 protrudes from the rotating shaft 62 in a direction perpendicular to the axial direction of the rotating shaft 62, but in a direction different from the protruding direction of the contact piece 64 (here, a direction forming an angle of approximately 120° counterclockwise in the plane of the drawing with respect to the contact piece 64).

[0040] 3 and 4, when the branch guide 40 is in the first guiding position, the lever member 60 is in a first detecting position in which the contact member 46 of the branch guide 40 is not in contact with the contact piece 64 of the lever member 60. When the branch guide 40 is in the second guiding position, as shown in FIG. 5, the branch guide 40 rotates counterclockwise on the page, causing the contact member 46 of the branch guide 40 to come into contact with the contact piece 64 of the lever member 60, causing the lever member 60 to rotate clockwise on the page about the rotation shaft 62 as a fulcrum, and to assume the second detecting position.

[0041] When the actuator 20 is in the non-contact position, the lever member 60 is in a first detection position in which the second contact piece 26 of the actuator 20 is in contact with the contact piece 64 of the lever member 60, as shown in Fig. 3. When the actuator 20 is in the contact position, as shown in Fig. 4, the second contact piece 26 of the actuator 20 presses the contact piece 64 of the lever member 60 as the actuator 20 rotates clockwise on the page, causing the lever member 60 to rotate clockwise on the page about the rotation shaft 62 as a fulcrum and take the second detection position.

[0042] The detection sensor 80 is a photosensor that detects the detection piece 66 of the lever member 60, and includes a light-emitting element and a light-receiving element that are arranged opposite each other. As shown in Fig. 3, the detection sensor 80 outputs an OFF signal (first signal) when the lever member 60 is in the first detection posture and the detection piece 66 of the lever member 60 is in the light-blocking position (i.e., between the light-emitting element and the light-receiving element).

[0043] As shown in Figures 4 and 5, when the lever member 60 is in the second detection posture and the detection piece 66 of the lever member 60 is in the light-transmitting position (i.e., a position away from between the light-emitting element and the light-receiving element), the detection sensor 80 outputs an ON signal (second signal).

[0044] As described above, when the actuator 20 is in the non-contact position and the branch guide 40 is in the first guiding position as shown in Fig. 3, the detection sensor 80 outputs an OFF signal. On the other hand, when the actuator 20 is in the contact position as shown in Fig. 4 or when the branch guide 40 is in the second guiding position as shown in Fig. 5, the detection sensor 80 outputs an ON signal.

[0045] In this way, in this embodiment, the output of an ON signal by the detection sensor 80 can determine whether the state of the image forming device 1 is either a state in which paper P is present on the first conveying path 113, or a state in which the branch guide 40 is in the second guiding position.

[0046] Incidentally, if there is no abnormality within the image forming apparatus 1 before image formation by the image forming unit 13 (for example, during warm-up), the actuator 20 takes the non-contact position and the branch guide 40 takes the first guiding position, and the detection sensor 80 outputs an OFF signal (first signal). Therefore, if the occurrence of an abnormality within the image forming apparatus 1 is detected by the detection sensor 80 outputting an ON signal before image formation by the image forming unit 13, it is necessary to identify the cause of the detection sensor 80 outputting the ON signal.

[0047] Therefore, in this embodiment, the control unit 10 operates in accordance with the above-mentioned detection program, and when the detection sensor 80 outputs an ON signal before image formation by the image forming unit 13, the control unit 10 performs a change operation to change the branch guide 40 from the second guiding position to the first guiding position, and when the detection sensor 80 still outputs an ON signal at the end of the change operation, the control unit 10 displays a notification screen on the display unit 16 indicating that paper P is present on the first conveying path 113, and when the detection sensor 80 outputs an OFF signal at the end of the change operation, the control unit 10 performs an abnormality detection process to prevent the notification screen from being displayed on the display unit 16.

[0048] [Operation] 6 is a flowchart showing the abnormality detection process. Hereinafter, the operation of the image forming apparatus 1 when the abnormality detection process is executed will be described in detail with reference to FIG.

[0049] When an image formation instruction from the user is received via the operation unit 17, the control unit 10 starts executing the abnormality detection process shown in Fig. 6. The control unit 10 first determines whether the detection sensor 80 is outputting an OFF signal (step S10). If the detection sensor 80 is outputting an OFF signal (YES in step S10), the control unit 10 ends the abnormality detection process.

[0050] If the detection sensor 80 outputs an ON signal (NO in step S10), the control unit 10 requests the fixing unit 14 to reduce the fixing pressure, and causes the fixing unit 14 to reduce the pressing force of the pressing member against the fixing roller 142, thereby reducing the fixing pressure (step S11).

[0051] After the process of step S11, the control unit 10 rotates the drive motors for driving the pressure roller 141 and the discharge roller 152 at full speed while keeping the heater of the fixing roller 142 OFF (step S12).

[0052] After processing step S12, the control unit 10 starts measuring the elapsed time from the start of full-speed rotation drive, and repeats the process of determining that the predetermined waiting time has not been reached (NO in step S13) until the elapsed time reaches a predetermined waiting time (350 milliseconds in this case).

[0053] When the elapsed time reaches a predetermined waiting time (YES in step S13), the control unit 10 stops the full-speed rotation drive and operates the solenoid provided in the branch guide 40 in the reverse direction for a time (40 milliseconds in this case) obtained by dividing the above-mentioned predetermined movement time (120 milliseconds in this case) by a predetermined number of times (three times in this case) (step S14).

[0054] By the processing of step S14, the branch guide 40 rotates a fixed distance (in this case, a distance obtained by dividing the distance required to return from the second guiding position to the first guiding position by the predetermined number of rotations) in the clockwise direction on the page with the rotation shaft 42 as a fulcrum. As a result, when the branch guide 40, which is in a position close to the second guiding position, moves to a position where it takes the first guiding position, the detection piece 66 of the lever member 60 moves from the transmitting position to the blocking position, and the detection sensor 80 outputs an OFF signal.

[0055] After the process of step S14, the control unit 10 determines whether the detection sensor 80 outputs an OFF signal (step S15). If the detection sensor 80 outputs an OFF signal (YES in step S15), the control unit 10 ends the abnormality detection process.

[0056] On the other hand, if the detection sensor 80 outputs an ON signal (NO in step S15), the control unit 10 determines whether the number of times the solenoid has operated is equal to or less than the predetermined number of times (three times in this case) (step S16). In this case, the number of times the solenoid has operated is one, so the control unit 10 determines that the number of times the solenoid has operated is equal to or less than the predetermined number of times (YES in step S16), and returns to the processing of step S14.

[0057] The control unit 10 repeats the processing from step S14 to step S16 until the detection sensor 80 outputs an OFF signal before the number of times the solenoid operates reaches a predetermined number of times (YES in step S15) or until the number of times the solenoid operates reaches a predetermined number of times (NO in step S16).

[0058] When the number of times the solenoid has been operated reaches a predetermined number of times, the branch guide 40 moves to a position where it takes on the first guiding position, even if it was in the second guiding position when the abnormality detection process started.

[0059] When the detection sensor 80 outputs an ON signal (NO in step S15) and the number of times the solenoid has operated reaches a predetermined number of times (NO in step S16), the control unit 10 determines that the reason the detection sensor 80 outputs an ON signal is that the actuator 20 is in a contact position, not the position of the branch guide 40, and causes the display unit 16 to display a notification screen indicating that paper P is present on the first transport path 113 (step S17). After processing step S17, the control unit 10 ends the abnormality detection process.

[0060] According to the above embodiment, one detection sensor 80 can detect the presence or absence of paper P on the first transport path 113 and the attitude of the branch guide 40. As a result, compared to the case where a sensor is provided to detect the occurrence of a paper jam and a sensor to detect the attitude of the branch guide 40, the number of sensors can be reduced, thereby achieving cost reduction.

[0061] Furthermore, according to the above embodiment, when the detection sensor 80 outputs an ON signal before image formation by the image forming unit 13, the control unit 10 causes the branch guide 40 to perform a change operation to change the position from the second guiding position to the first guiding position, and when the detection sensor 80 still outputs an ON signal at the end of the change operation, the control unit 10 causes the display unit 16 to display a notification screen indicating that paper P is present on the first conveying path 113.

[0062] This allows the cause of the detection sensor 80 outputting the ON signal before image formation to be identified as the paper P on the first conveying path 113, and the user can be notified of this. Therefore, the user can easily eliminate the cause of the abnormality by, for example, opening the cover of the image forming apparatus 1 and removing the paper P on the first conveying path 113.

[0063] Furthermore, according to the above embodiment, the control unit 10 does not cause the display unit 16 to display the notification screen if the detection sensor 80 outputs an OFF signal at the end of the change operation.

[0064] This prevents the notification screen from being displayed uselessly when there is no paper P on the first conveying path 113. Furthermore, if the sensor outputs an ON signal before image formation due to the position of the branch guide 40, the branch guide 40 is set to the first guiding position, thereby eliminating the cause of the abnormality.

[0065] (Other variations) The present invention is not limited to the above-described embodiment and modified examples, and various modifications are possible. For example, in the above-described embodiment, the image forming unit 13 etc. forms an image on paper P, but the present invention is not limited to such an embodiment. The image forming unit 13 etc. may form an image on other recording media, not limited to paper P. An example of other recording media is an OHP (Overhead Projector) sheet.

[0066] In the above embodiment, a tandem color printer is used as the image forming apparatus 1, but this is merely an example. The image forming apparatus 1 may be an electrophotographic image forming apparatus, a color multifunction machine, a monochrome multifunction machine, a copy machine, or a facsimile machine.

[0067] The configurations and processes of the above-described embodiment and modified examples shown with reference to FIGS. 1 to 6 are merely one embodiment of the present invention, and the present invention is not limited to these configurations and processes. [Explanation of symbols]

[0068] 1. Image forming device 10 Control Unit 13 Image forming unit 14 Fixing section 16 Display section 20 Actuators 40 Branch Guide 60 Lever member 80 Detection Sensor 113 First conveying route 114 Second transport route

Claims

1. an image forming unit that forms an image on a sheet; a fixing unit that fixes the image onto the paper; a first conveying path extending from the fixing unit to a discharge port; a second conveying path branching from the first conveying path and extending toward the image forming unit; a branch guide that takes a first guiding position when guiding the paper to the first transport path and takes a second guiding position when guiding the paper to the second transport path; a paper contact member that takes a non-contact position when not in contact with the paper on the first transport path and takes a contact position when in contact with the paper on the first transport path; a detection target member that takes a first detection position when the branch guide takes the first guiding position, and a second detection position when the branch guide takes the second guiding position, and that takes the first detection position when the paper contact member takes the non-contact position, and that takes the second detection position when the paper contact member takes the contact position; a sensor that outputs a first signal when the detection target member is in the first detection position, and outputs a second signal when the detection target member is in the second detection position.

2. A control unit; a display unit, 2. The image forming apparatus of claim 1, wherein when the sensor outputs the second signal before image formation by the image forming unit, the control unit causes the branch guide to perform a change operation to change from the second guiding position to the first guiding position, and when the sensor still outputs the second signal at the end of the change operation, the control unit causes the display unit to display a notification screen indicating that the paper is present on the first transport path.

3. The image forming apparatus according to claim 2 , wherein the control unit does not cause the display unit to display the notification screen if the sensor outputs the first signal at the end of the change operation.

Images