JP4594904B2 - Image forming apparatus - Google Patents

Description

  The present invention includes a belt-like conveyance unit that adsorbs and conveys a sheet-like recording medium (hereinafter simply referred to as paper), and uses a liquid printing material for the recording medium conveyed by the belt-like conveyance unit. The present invention relates to an image forming apparatus that performs printing.

  Borderless printing has already been performed in printers using inkjet technology. As the method, ink is ejected more than the width of the paper and the ink protruding from the paper is discarded to realize borderless printing.

  As an example of such borderless printing, for example, the invention disclosed in Patent Document 1 is known. In the present invention, when the recording medium is transported by the transport belt, if recording without margin is performed, the recording liquid adheres to the transport belt and the transport function is deteriorated, or the recording liquid is formed on the back surface of the recording medium. Is transferred again, and the quality of the printed matter is deteriorated. Therefore, the first and second belt units arranged in the paper conveyance direction are provided, and the first belt unit includes the first conveyance belt and the first conveyance roller. The second belt unit hangs between the first tension roller, the second belt unit hangs the second conveying belt between the second conveying roller and the second tension roller, and the first and second belt units. In the meantime, ink droplets are ejected from the recording head to perform recording without margins on the front and rear ends of the paper.

  The invention disclosed in Patent Document 2 is also known. In the present invention, when the transport belt is composed of five belts divided in the main scanning direction, and the five belts transport the paper by the center distribution method, the transport belt corresponds to both ends of the transported paper in the main scanning direction. In this case, the recording is performed so that a gap is formed at the position, and recording without margins is performed by ejecting droplets toward the gap to the area where the sheet is removed.

In any case, Patent Documents 1 and 2 disclose a configuration in which borderless printing is realized by setting two transport belts with a gap and discarding the ink protruding from the paper in the gap during printing. Has been.
JP 2005-306515 A JP 2005-305688 A

  In conventional printers that perform borderless printing in this way, paper was not transported by a single transport belt, but could be realized because it was transported using a plurality of belts, In order to carry the paper at a precise distance (μm unit), the paper must be transported by adsorbing the paper by, for example, an electrostatic method and carrying the paper. Since the transport belt that performs such electrostatic adsorption has a width that is greater than the width of the paper, it is not possible to discard the ink that protrudes from the paper, and it remains on the transport belt when the ink protrudes from the paper. Become.

  However, if the transport belt having a paper suction function is soiled with ink, cleaning of the ink is not easy, and there is a problem that when the next paper is sucked, the paper becomes soiled with ink, and the paper suction function is provided. Ink jet printers using a conveyor belt cannot achieve borderless printing.

  Therefore, a problem to be solved by the present invention is to realize borderless printing in a printer using a conveyance belt having a paper suction function.

In order to solve the above-described problem, a first means of the present invention is an image forming apparatus including a plurality of belt-like conveyance units that suck and convey a sheet-like recording medium, wherein the plurality of belt-like conveyance units include: Including a first belt having a width in a direction perpendicular to the conveyance direction of the recording medium that is smaller than the width of the recording medium, and a second belt having a width smaller than the width of the first belt, A moving means for moving the second belt in a direction orthogonal to the conveyance direction of the recording medium is provided, and the width size corresponds to the width size in the direction orthogonal to the conveyance direction of the recording medium. When it is smaller than the sum of the width of the belt and the width of the second belt, the recording medium is conveyed using the first belt, and the width of the first belt and the width of the second belt are used. Greater than the sum of To make the transfer of the second belt is moved to be adjacent to the first belt, the recording medium using both the first belt and the second belt by the moving means to Features.

According to a second means of the present invention , in the first means, when the width size of the recording medium is smaller than the sum of the width of the first belt and the width of the second belt, The belt is arranged such that one end and the other end parallel to the recording medium conveyance direction are located outside, and the recording medium is conveyed, and the sum of the width of the first belt and the width of the second belt. If larger, the second belt is further moved by the moving means, and the recording medium is conveyed in such an arrangement that the other end parallel to the conveying direction of the recording medium is positioned outside. And

In the embodiments described below, the belt-shaped transport means to the conveyor belt 101,111,112,113, means for moving the motor 118 and belt 117, respectively corresponding.

According to the present invention, since it can dropped into liquid printing material to the adjacent portion of the recording medium edge or label belt-like conveying means, to realize the borderless printing using the conveyor belt having a paper adsorption function Can do.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a system configuration of a full-color digital copying machine having a composite function according to Embodiment 1 of the present invention. This full-color copying machine is generally composed of units of an automatic document feeder (ADF) 400, an operation board 620, a color scanner 300, an ink-jet color printer 100, and a paper feed bank 200. A system controller in the copying machine is connected to a personal computer PC via a LAN (Local Area Network). The system controller of the copying machine can be connected to a communication network (Internet), and can exchange data by communicating with a management server of a management center (not shown) via the communication network. The facsimile controller FCU in the machine can perform facsimile communication via the exchange PBX and the public communication network PN.

  In the digital copying machine configured as shown in FIG. 1, for example, print data is output from the printer driver to the printer 100 based on the data or image print command processed by the personal computer PC from the personal computer PC. The printer 100 prints a necessary number of sheets on the paper supplied from the paper bank 200 (images are formed), and the paper is discharged onto the paper discharge tray each time printing for each paper is completed.

  FIGS. 2 and 3 are views showing a state of determining the paper position in each of the trays 201 and 202 in the paper supply bank 200 in this embodiment. In this embodiment, the paper is set by vertical feeding. Walls (paper guides) are mounted on the paper feed trays 201 and 202 according to the paper size, or adjusted to the paper size. In other words, the first wall (paper guide) 123 is removable, the wall cannot be moved, the second wall (paper guide) 124 is not removable, the movable wall, and the third wall (paper guide) 125 is not removable. This is an immovable wall. The movement is a movement in a direction (X direction in the drawing) orthogonal to the paper feeding direction (arrow Y direction).

  For example, in the case of A4 vertical, the position of the movable second wall 124 is adjusted with reference to the immovable first wall 123 as shown in FIG. In the case of A3 length, the first wall 123 is removed, and the position of the second wall 124 is adjusted with reference to the third wall 125 to set the width to A3 length.

  On the other hand, in the case of an ink jet printer, it is common to transport a sheet to a print head and use a transport belt from a printing position to a discharge position. Among these, in order to ensure the conveyance accuracy of the paper, it is generally performed to convey the sheet by attracting the sheet by applying an electrostatic adsorption force between the conveyance belt and the sheet. Therefore, when printing is performed on the edge of the paper, or when printing is performed with the paper edge removed, ink adheres to the conveyance belt. As described above, once ink adheres to the conveyor belt, it is not easy to clean and causes the paper to become dirty, or causes the printing paper to deteriorate in flatness due to increased thickness, leading to deterioration in printing quality. It also becomes.

  In order to cope with this, in this embodiment, a groove is formed on the surface of the conveying belt in accordance with the paper size. This example is shown in FIGS. 4 is a plan view showing the relationship between the conveyance belt and the paper in the case of A4 paper vertical conveyance, and FIG. 5 is a plan view showing the relationship between the conveyance belt and the paper in the case of A3 paper vertical conveyance. In the example of FIG. 4, the first and second grooves 102 and 103 formed on the conveyor belt 101 are positioned at the front and rear ends of the A4 vertical, and the third and fourth grooves 104 and 105 are positioned at both ends. It is formed according to.

  The positions of the first and second walls 123 and 124 shown in FIG. 2 and the positions of the grooves 102, 103, 104, and 105 shown in FIG. 4 are aligned with the four sides of the sheet in the case of A4 sheet vertical conveyance. Therefore, when A4 paper is transported vertically, when the paper tray 201 is set and transported as shown in FIG. 2, ink is ejected into the first to fourth grooves 102 to 105 formed in the transport belt 101. Borderless printing can be realized. Similarly, in the case of A3 paper conveyance, the positions of the second and third walls 124 and 125 shown in FIG. 3, the first, fourth and fifth grooves 102, 105 and 106 shown in FIG. Since the position outside the belt on the right side is aligned with the four sides of the paper in the case of A3 paper vertical conveyance, when the A4 paper is conveyed vertically, if the paper tray 201 is set and conveyed as shown in FIG. Ink can be ejected out of the grooves 102, 105, 106 formed on the right side and the belt on the right side of the conveying belt 101, and borderless printing can be realized.

  Note that the non-movable first wall 123 in FIG. 2 is a reference for determining the paper position so that the right edge of the paper enters the third groove 104 in FIG. When paper is supplied with the reference set in this way, the right edge of the paper overlaps with the third groove 104 of the conveyor belt 101. In the case of A3, the immovable third wall 125 serves as a reference for determining the position of the sheet so that the right end of the sheet comes out of the belt, and when the sheet is fed, the right end of the sheet is positioned outside the conveyance belt 101. The relationship between the paper feed tray 201 and the conveyance belt 101 in FIGS. 2 to 5 is a configuration example for realizing borderless printing. Even in the case of A4 paper vertical conveyance, a configuration in which the right end is outside the belt and the other three sides use grooves is acceptable. In FIGS. 4 and 5, the A4 vertical and A3 vertical examples are individually set. However, the arrangement of the grooves on the conveying belt 101 shown in FIGS. It can also be configured to apply to both the vertical. In addition, a groove may be formed in advance according to the paper size and direction to be used so that borderless printing can be performed regardless of the paper size and direction.

  FIG. 6 is a main part plan view showing the relationship between the transport belt 101 and the position detection device on the main body side, and FIG. 7 is a plan view showing the structure of the transport belt and its drive mechanism. If the relative positional relationship between the wall and the groove as shown in FIGS. 2 to 5 is not exactly matched, the ink is ejected onto the conveyance belt 101 other than the groove. In order to perform such relative position control, it is necessary to accurately detect the home position of the conveyor belt 101. In this embodiment, a filler 109 is provided on the conveying belt 101 side, and a light transmission type sensor (photo interrupter) 110 is provided on the main body side. The filler 109 blocks the optical path of the transmission type sensor 110, thereby providing a transmission type sensor. The configuration is such that the position of the filler 109 is detected. In other words, when the transport belt 101 rotates, the filler 109 also rotates together with it. When the conveyance belt 101 reaches the home position, the filler 109 on the conveyance belt 101 side blocks the LED light of the transmission sensor 110 on the main body side, and detects the home position by changing the output of the transmission sensor 110. The home position itself may not be this position, but may be set such that the transmission sensor 110 is moved by a preset number of pulses after the filler 109 is cut. When the home position is detected in this way, the rotation of the conveyor belt 101 is stopped. The number of pulses is the number of pulses when the motor that feeds the conveyor belt is a stepping motor. The position can also be defined by encoder pulses using an encoder.

  When the home position sensor of the conveyor belt 101 can be detected with high accuracy in this way, the first, second, and fifth grooves 102 formed in the direction orthogonal to the home position and each of the grooves, particularly the conveyance direction. , 103, 106 and the paper edge can be set with high accuracy.

  FIG. 8 is a block diagram showing the main parts of the electrical configuration of the printer 100 and the paper feed bank 200 of the color copying machine according to this embodiment. In the figure, a print control unit 1, a conveyance belt rotation processing unit 2, an adsorption function processing unit 3 that adsorbs sheets of the conveyance belt 101, and a paper feed position setting unit 4 are shown. In the figure, a print control unit 1, a conveyance belt rotation processing unit 2, and a suction function processing unit 3 are provided in a printer 100, and a paper feed position setting unit 4 is provided in the paper feed bank 200. Between the print control unit 1 and the paper feed position setting unit 4, paper set information is sent from the paper feed position setting unit 4 to the print control unit 1, and the print control unit 1 places the paper at a position for borderless printing. Confirm that is set. Between the print control unit 1 and the conveyance belt rotation processing unit 2, the rotation amount information (encoder count value, etc.) of the conveyance belt 101 is fed back from the conveyance belt rotation processing unit 2 to the print control unit 1, and the print control unit is obtained from the information. 1 calculates an appropriate transport belt feed amount and issues an instruction to the transport belt rotation amount processing unit 2. Between the print control unit 1 and the suction function processing unit 3, the print control unit 1 transfers to the suction function processing unit 3 paper suction control information, for example, control change according to the size of the paper, the position of the paper on the belt, etc. The information of is output. Based on this information, the suction function processing unit 3 controls the paper suction function.

FIG. 9 is a flowchart showing a control procedure for positioning and printing of the paper on the conveyor belt 101 in this embodiment.
In this processing procedure, the paper size is detected in the paper feed tray 201, and the paper position is mechanically determined in the paper feed tray 201 (step S101). As shown in FIG. 2 or FIG. 3, the positions of the walls 123, 124, and 125 are set according to the sheet size, so that the sheet size is uniquely determined from the wall position. If the paper size is uniquely determined, the paper position is uniquely determined by the walls 123, 124, and 125. When the paper position is uniquely determined in this way, paper can be fed so that the left and right edges of the paper are positioned outside the belt groove or belt.

  Next, the transport belt 101 is moved to the initial position by using the home position sensor 101 so that the front end of the sheet and the first groove 102 of the transport belt 101 coincide with each other (step S102). In step S101, the left and right edges of the paper are set so as to be positioned outside the groove or belt on the paper feed tray 201. Therefore, when the transport belt 101 is moved from the initial position and the paper is transported while being sucked, the paper These four sides are located in the groove, or one of the four sides is located outside the conveyor belt. If ink is ejected from the ink jet head and written in such a state, the ink at the edge of the paper is ejected to the grooves 102 to 106 or outside the conveying belt, and an image without a border can be printed (step S103). .

  When printing is completed, the conveyor belt 101 is rotated in reverse so that the groove where the rear end of the paper is positioned can be used as the front end groove of the paper to be printed next (step S104). At this time, since the home position of the conveyor belt 101 is detected by the home position sensor 110, the reverse rotation amount can be controlled by software without using the sensor 110.

  When such a reverse rotation function of the conveyor belt 101 is not provided, it is necessary to make a groove to be used at the front end of the next printed sheet immediately after the groove used on the rear end side of the sheet being printed. . This is because a slight distance between the sheets is necessary between the sheet being printed and the next print sheet. However, since this increases the number of grooves, the conveyor belt 101 is rotated in the reverse direction and printing is in progress. The groove at the rear end of the sheet and the groove at the front end of the next print sheet are shared. As used herein, the reverse rotation function naturally means that the belt can be rotated only in a certain direction in order to convey the paper in a certain direction. However, the groove used at the rear edge of the printing medium and the front edge of the next printing paper. Is a function to rotate in the direction opposite to the belt rotation for the paper conveyance direction.

  In addition, an ink absorber (not shown) is mounted in the groove so that the ink discharged into the grooves 102 to 106 does not adversely affect the transport belt 101 and the paper. When the ink absorber is mounted in the groove in this way, the function is maintained by replacing the dirty absorber during maintenance, so that a large-scale conveyor belt replacement is not necessary.

  As described above, according to the present embodiment, the grooves 102 to 106 are formed in the conveyor belt 101, and the removable ink absorber is provided in the grooves 102 to 106. By ejecting the ejected ink into the grooves 102 to 106, the ink can be held in the grooves 102 to 106. Further, by holding the ink in the grooves 102 to 106 in this way, borderless printing can be realized without soiling the conveyor belt 101 or the paper. Furthermore, since it has a suction function, paper can be transported in units of μm, so that high-precision and high-quality borderless printing can be performed.

  In the invention according to the first embodiment, when performing borderless printing, the ink ejected to the edge and the edge of the paper is added to the grooves 102 to 106 formed in the conveyor belt 101, or to the outside of the conveyor belt 101 in addition to the grooves. The ink is discharged to produce a borderless print. This embodiment is an example that enables borderless printing without forming grooves. In the first embodiment, the system configuration shown in FIG. 1 and the configuration of the paper feed tray 201 shown in FIGS. 2 and 3 are the same in this embodiment, so the description of the same configuration is omitted, and only different points will be described. .

  FIG. 10 is a plan view of the conveyor belt portion in the second embodiment. In the present embodiment, the conveyor belt portion is composed of three types of conveyor belts of first to third conveyor belts 110, 112, and 113. Of these, the first conveyor belt 111 is formed to have a width corresponding to the sheet width of the maximum width sheet, and the second conveyor belt 112 having a width approximately half that of the first conveyor belt 111 on the upstream side in the sheet conveyance direction. A third conveyor belt 113 having a width approximately half that of the second conveyor belt 112 is provided. Of these, the first and second conveyor belts 111 and 112 are arranged in parallel with the right end position in the figure, and the third conveyor belt 113 is movable in the direction perpendicular to the sheet conveyance direction. Are provided in parallel with the conveyor belt 112. The upper surfaces of the first to third conveyor belts 111, 112, and 113 are arranged with high precision so as to be on the same plane, and each has a function of holding a sheet by electrostatic attraction.

  FIG. 10 is a plan view showing a state when the A4 paper 114 is conveyed and printed. When the three types of conveyor belts 110, 112, and 113 are used in this way, the front end 114a of the sheet is in the gap 111a between the first conveyor belt 111 and the second conveyor belt 112, and the right end 114b of the sheet is the conveyor belts 111, 112. In addition, marginless printing is performed by ejecting ink into the gap 112a between the second conveyance belt 112 and the third conveyance belt 113 at the left end 114c of the sheet and the gap 111a at the rear end 114d of the sheet. be able to. Borderless printing on the front end 114a, rear end 114d, and right end 114b side of the paper 114 can always be realized without movement of the first and second transport belts 111 and 112 in a direction perpendicular to the paper transport direction. However, the left end 114c can perform borderless printing by moving the third conveyor belt 113 to an appropriate location according to the size of the paper.

  That is, when the sheet is an A3 sheet 115 as shown in FIG. 11, the sheet left end 114c is positioned on the third conveyor belt 113 when the third conveyor belt 113 is in the position of FIG. . If borderless printing is performed at this position, the third conveyor belt 113 becomes dirty, leading to poor conveyance of the paper and contamination of the paper. Therefore, in this embodiment, as shown in FIG. 11, the third conveyor belt 113 is moved in the direction of the second conveyor belt 112, and the paper left end 114 c is positioned further outward from the left end of the third conveyor belt 113. As a result, borderless printing can be performed without the ink ejected to the left edge of the paper adhering to the third conveyor belt 113.

  FIG. 12 is a block diagram showing the main components of the electrical configuration of the printer 100 and the paper feed bank 200 of the color copying machine according to this embodiment. In FIG. 12, the print controller 1, the conveyor belt rotation processor 2, and the conveyor An adsorption function processing unit 3 that performs sheet adsorption of the belt 101, a paper feed position setting unit 4, and a conveyance belt position processing unit 5 are shown. In the figure, a print control unit 1, a conveyance belt rotation processing unit 2, an adsorption function processing unit 3, and a conveyance belt position processing unit 5 are provided in a printer 100, and a paper feed position setting unit 4 is provided in the paper feed bank 200. Yes.

  In the figure, between the print control unit 1 and the paper feed position setting unit 4, paper set information is sent from the paper feed position setting unit 4 to the print control unit 1, and the paper is set at a position for performing borderless printing. Make sure that it is. Between the print control unit 1 and the conveyance belt position processing unit 5, print control is performed on information related to the positions of the conveyance belts 111 to 113 from the conveyance belt position processing unit 5, for example, information such as an encoder output that controls the conveyance belt position. The printing control unit 1 processes the size information of the fed paper, and sends a conveyance belt movement signal to the conveyance belt position processing unit 5.

  Between the printing control unit 1 and the conveyance belt rotation processing unit 2, rotation amount information (encoder count value, etc.) of the conveyance belts 111 to 113 is fed back from the conveyance belt rotation processing unit 2 to the printing control unit 1, and printing is performed from the information. An appropriate conveyance belt feed amount is calculated in the control unit 1 and an instruction is issued to the conveyance belt rotation processing unit 2. Between the print control unit 1 and the suction function processing unit 3, control change from the print control unit 1 to the suction function processing unit 3 according to the paper suction control information, for example, the size of the paper and the position of the paper on the belt Etc. are output.

FIG. 13 is a flowchart showing a control procedure for the movement of the conveyor belt in this embodiment.
In this processing procedure, first, the paper size to be fed is detected by the paper feed tray 201 (step S201). This is as described with reference to FIGS. 2 and 3 of the first embodiment. Next, the third conveyor belt 113 is moved to a position set in advance according to the paper size detected by the paper feed tray 201 (step S202). As a result, the relationship between the conveyance belts 111 to 113 and the sheets 114 and 115 as shown in FIG. 10 or FIG. 11 is established, and the ink protrudes from the sheet between the conveyance belts 111 and 112, 112 and 113, and outside the conveyance belt. Can be discharged, and borderless printing is realized (step S203).

  FIG. 14 is a plan view showing a lateral movement mechanism of the third conveyor belt 113. In this moving mechanism, the third conveying belt 113 is provided so as to be movable along a shaft 116 installed in a direction orthogonal to the sheet conveying direction and a timing belt 117 installed in parallel to the shaft 116. . The moving distance of the third conveyor belt 113 is detected by an encoder 119 that is meshed with the timing belt 117 and is provided coaxially with the rotating shaft of the motor 118 that drives the timing belt 117 and rotates integrally therewith. The home position of the third conveyor belt 113 is set by detecting the filler 121 protruding from the non-rotating portion of the third conveyor belt 113 with the light transmission sensor 120.

  FIG. 15 is a flowchart showing a control procedure for moving the third conveyor belt 113 in a direction orthogonal to the sheet conveyance direction. In this processing procedure, when the power is turned on, the third transport belt 113 moves in a direction orthogonal to the paper transport direction (step S301). At this time, the filler 121 blocks the optical path between the LED and PD of the transmission type sensor 120 fixed to the printer 100 body as the third conveying belt 113 moves. In this embodiment, the position is set as the home position (step S302). When the home position is set, the motor 118 rotates by a movement distance set in advance according to the size of the paper to be transported, the left end 114c of the paper is positioned outside the transport belt 113, and the ink protruding from the paper is removed. The ink is discharged to the outside of the conveyor belt 113. In the present embodiment, the preset movement distance is detected using the encoder 119, and the movement position can be set with high accuracy (step S303).

  As described above, in this embodiment, a plurality of conveyor belts are aligned with a sheet and moved in a direction perpendicular to the sheet conveyance direction, thereby creating a gap between the conveyance belts, overlapping the sheet end in the gap, and further, the gap Ink can be discharged without causing the conveyor belt to become dirty with ink. In addition, since a conveyance belt having a suction function is used, paper conveyance control in units of μm can be realized, and high-accuracy and high-quality borderless printing can be performed.

1 is a diagram showing a system configuration of a full-color digital copying machine having a composite function according to Embodiment 1 of the present invention. 6 is a diagram illustrating a state of determining the paper position of A4 vertical paper in a paper feed tray in a paper feed bank in Embodiment 1. FIG. 6 is a diagram illustrating a state of determining the paper position of A4 vertical paper in a paper feed tray in a paper feed bank in Embodiment 1. FIG. FIG. 6 is a plan view illustrating a relationship between a conveyance belt and a sheet in the case of A4 sheet longitudinal conveyance in Embodiment 1. FIG. 6 is a plan view illustrating a relationship between a conveyance belt and a sheet in the case of A3 sheet longitudinal conveyance in Embodiment 1. FIG. 3 is a plan view of a main part showing a relationship between a conveyance belt and a main body side position detection device in Embodiment 1. FIG. 3 is a plan view illustrating a configuration of a conveyance belt and a driving mechanism thereof in Embodiment 1. FIG. 3 is a block diagram illustrating a main part of an electrical configuration of a printer and a paper feed bank of the color copying machine according to the first exemplary embodiment. 3 is a flowchart illustrating a control procedure for positioning and printing of a sheet on a conveyance belt according to the first exemplary embodiment. FIG. 10 is a plan view of a transport belt portion when transporting A4 vertical paper in Embodiment 2. FIG. 10 is a plan view of a transport belt portion when transporting A3 vertical paper in Embodiment 2. FIG. 6 is a block diagram showing the main parts of the electrical configuration of a printer and a paper feed bank of a color copying machine in Embodiment 2. 6 is a flowchart illustrating a control procedure for movement of a conveyor belt according to a second exemplary embodiment. FIG. 10 is a plan view showing a lateral movement mechanism of a third conveyor belt in Embodiment 2. 10 is a flowchart illustrating a control procedure for moving a third conveyor belt in the second embodiment in a direction orthogonal to the sheet conveyance direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Print control part 2 Conveyance belt rotation process part 3 Adsorption | suction function processing part 4 Paper feed position setting part 5 Conveyance belt process part 100 Printer 101,111,112,113 Conveyance belt 102,103,104,105,106 Groove 107,108 , 114, 115 Paper 109, 121 Filler 110, 120 Transmission type sensor 123, 124, 125 Wall (paper guide)
118 Motor 119 Encoder
200 Paper feed bank 201, 202 Paper feed tray

Claims (2)

In an image forming apparatus provided with a plurality of belt-shaped conveying means for adsorbing and conveying a sheet-like recording medium,
The plurality of belt-shaped conveying means includes a first belt having a width in a direction perpendicular to the conveying direction of the recording medium that is smaller than a width of the recording medium, and a width smaller than the width of the first belt. Including a second belt with
A moving means for moving the second belt in a direction perpendicular to the conveyance direction of the recording medium;
The first belt is used when the width size is smaller than the sum of the width of the first belt and the width of the second belt according to the width size in the direction orthogonal to the conveyance direction of the recording medium. Then, the recording medium is conveyed, and when the width of the first belt and the width of the second belt is larger than the sum of the widths of the first belt and the second belt, the second belt is moved by the moving means. An image forming apparatus, wherein the recording medium is conveyed by using both the first belt and the second belt . 2. The image forming apparatus according to claim 1, wherein when the width size of the recording medium is smaller than a sum of a width of the first belt and a width of the second belt, the first belt is used as the recording medium. When the recording medium is transported in an arrangement in which one end and the other end parallel to the transport direction are positioned on the outside, and larger than the sum of the width of the first belt and the width of the second belt , you and performs conveyance of the recording medium as the arrangement further parallel other end portion and the conveying direction of the recording medium by moving a belt second is located outside by the moving means images Forming equipment.

Images