JP2018030691A - Sheet transport device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit ink mist generated in printing with an inkjet head printing device from adhering to a belt surface to prevent a sheet from smearing.SOLUTION: A sheet transport device includes sectioning means 6 configured such that a partition plate 5c is installed on a side of a suction port 5a in a pair of suction means 5 arranged while the suction ports 5a are opposite to each other, in order to section a suction area E1 set at a belt surface 4a from a vent area E2 and one or both thereof are movable relatively to a width direction depending on a width dimension of a sheet P directly beneath the belt surface 4a of a suction transfer belt 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a sheet conveying apparatus disposed below a printing unit of an inkjet printing apparatus that performs printing by discharging ink from, for example, an inkjet head onto a sheet (paper) serving as a recording medium.

  As an image forming apparatus for forming a desired image on a sheet, which is a sheet-like recording medium, a plurality of line heads are arranged side by side along the sheet conveyance direction, and the nozzles of each line head are arranged on the sheet to be conveyed. 2. Related Art Inkjet printing apparatuses that form a desired image by ejecting ink are known.

  In this inkjet printing apparatus, when a plurality of sheets are continuously conveyed directly under the line head, damage to the head surface of the line head due to the lifted sheet edge or the line head is prevented while preventing sheet misalignment during conveyance. In order to prevent fouling due to ink adhering to the periphery, a suction conveyance belt having a plurality of vent holes is provided, and the negative pressure generating means conveys the paper while sucking and adsorbing the paper to the belt surface of the suction conveyance belt through the vent holes. (For example, refer to the following Patent Document 1).

JP-A-2015-199595

  In the conventional conveyance device including the conveyance device of Patent Document 1, the suction conveyance belt is designed to have a width dimension and a conveyance direction length according to a maximum size paper (for example, A3 paper) that can be conveyed. The action of the suction force by the belt extends over the entire belt surface. For this reason, for example, when a print job using A4 paper having a width smaller than that of A3 paper is performed, an area other than the passage area on which the paper passes on the belt surface is an area that sucks only air (that is, the paper passes). Non-passing area).

  By the way, the size of the non-passing area on the belt surface is defined by the size of the paper to be transported, but depending on the size of the non-passing area, the airflow of the sucked air is irregularly disturbed and occurs during ink ejection. Fine ink mist may adhere to the belt surface. For this reason, when a paper that is wider than the previous paper size is transported during a print job, there is a risk that the ink attached to the non-passing area will adhere to the back side of the paper and become soiled. .

  Therefore, the present invention has been made in view of the above problems, and provides a sheet conveying apparatus that prevents ink mist from adhering to a belt surface generated during printing by an inkjet head printing apparatus and prevents sheet contamination. It is for the purpose.

In order to achieve the above-described object, the first aspect of the present invention includes an endless suction conveyance belt provided with a plurality of vent holes,
A suction means for sucking air from the back surface side of the belt through the vent hole and sucking and holding the sheet on the belt surface;
In a sheet conveying apparatus comprising:
The passage area of the sheet on the belt surface of the suction conveyance belt is an intake area of the suction means, and the non-passage area of the sheet in the suction conveyance belt is an exhaust area of the suction means,
The sheet conveying apparatus according to claim 1, further comprising a sorting unit that adjusts the intake area or the exhaust area according to a sheet width of the sheet to divide each area.

  According to a second aspect of the present invention, in the sheet conveying apparatus according to the first aspect, the sorting means includes the intake area and the exhaust area according to the sheet width of the sheet on the back side of the suction conveying belt. A sheet conveying apparatus comprising a pair of partition plates whose intervals can be adjusted so as to be divided.

  According to a third aspect of the present invention, in the sheet conveying apparatus according to the first or second aspect, the sorting means is a non-ventilated air that is not sucked or exhausted by the suction means between the intake area and the exhaust area. The sheet conveying apparatus is characterized in that an area is formed.

  According to the sheet conveying apparatus according to the first or second aspect, the belt uses the sheet passing area on the belt surface as the intake area and the sheet non-passing area as the exhaust area according to the sheet width of the sheet passing through the suction conveying belt. Since the sorting means for sorting on the surface is provided, it is possible to prevent ink mist generated during printing from adhering to the non-passing area of the belt surface. Therefore, for example, even when a print job using a small size sheet (A4 paper) is shifted to a print job using a large size sheet (A3 paper), the back surface of the A3 paper is stained by ink mist. There is no adhesion.

  Further, since the non-passing area is the exhaust area, there is an effect of preventing the ink mist generated when the ink is discharged from adhering to the belt surface due to the exhausted air.

  According to the sheet conveying apparatus according to the third aspect, by setting along the conveying direction so that the sheet passing area and the non-passing area on the belt surface are not adjacent to each other and are separated by a predetermined range, It is possible to suppress the turbulence of the air flow caused by the air exhausted from the exhaust area that causes the turbulence of the printed image.

1 is a schematic configuration diagram of an ink jet printing apparatus on which a sheet conveying apparatus according to the present invention is mounted. FIG. 2A is a schematic configuration diagram of the sheet conveying apparatus viewed from the plane, and FIG. 2B is a schematic configuration diagram of the apparatus viewed from the conveyance direction side. It is the figure which showed typically the state of the intake / exhaust in the suction conveyance belt surface vicinity of the apparatus. (A) is a diagram showing a state when a print job using A4 paper is executed in the apparatus, and (b) is a diagram showing a state when a print job using A3 paper is executed in the apparatus. (A), (b) is a figure which shows the other example of a form of the sheet conveying apparatus which concerns on this invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited by this embodiment, and other forms, examples, operational techniques, and the like that can be considered by those skilled in the art based on this form are all included in the scope of the present invention. To do.

  In the present specification, in the following description with reference to the accompanying drawings, when the words “up”, “down”, “left”, and “right” are used to indicate directions and positions, this is shown in FIG. Matches top, bottom, left, and right. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, vertical / horizontal dimensional ratio, shape, and the like may be changed from the actual ones and expressed schematically for the sake of convenience. It is an example and does not limit the interpretation of the present invention.

  Further, in the following description, the “conveyance direction” is a direction in which a sheet (paper P) that is a recording medium at the time of printing is conveyed, and in this embodiment, the length when the paper P is viewed in plan view. Matches the side direction. Further, the “width direction” is a direction orthogonal to the transport direction (that is, a direction perpendicular to the transport direction on the same plane), and in the present embodiment, coincides with the short side direction when the paper P is viewed in plan. To do.

[Configuration of Inkjet Printing Device]
First, an inkjet printing apparatus 100 on which the sheet conveying apparatus 1 according to the present invention is mounted will be described.
As shown in FIG. 1, an inkjet printing apparatus 100 according to the present embodiment is an image forming apparatus that prints a predetermined image on a sheet (paper P) serving as a recording medium. The unit 20, the printing unit 30, the paper discharge unit 40, the reversing unit 50, the storage unit 60, the control unit 70, the setting display unit 80, and the image reading unit 90 are provided.

  The print job executed by the inkjet printing apparatus 100 of the present invention includes various printing conditions (number of prints, print data (characters, images), single-sided / double-sided printing, color settings (single color, multicolor), output magnification, etc. ) Is set information.

  This print job is information received through various communication networks such as the Internet (Internet) and Ethernet (registered trademark), for example, for which print conditions are set by an external terminal such as a PC (personal computer) or a server. In addition, information in which printing conditions are appropriately set in the setting display unit 80 may be set as the print job for the document data obtained by reading the document as a paper medium by the image reading unit 90.

As shown in FIG. 1, a circulation path R <b> 1 is set in the casing of the inkjet printing apparatus 100 as a transport path for paper P that is a print medium.
This circulation path R1 is for returning to the normal path R2 after switching the normal path R2 for transporting the image-formed paper P to the paper discharge unit 40 and the front and back in the transport direction of the paper P with the image formed on the front surface. This is a closed-loop circulation path composed of the reverse path R3. The sheet P is image-formed while being conveyed in the counterclockwise direction in the figure along the circulation path R1, and is switched back through the reverse path R3 as necessary. In addition, a paper feed route R4 that connects the paper feed unit 10 is connected to the upstream side of the printing unit 30 in the circulation route R1.

―Paper Feeder―
The paper feed unit 10 picks up an external paper feed tray 11 that is partly exposed outside the housing and the paper P loaded on the external paper feed tray 11 one by one and supplies it to the printing unit 30. An external paper feed roller 12 to be sent, a plurality of internal paper feed trays 13 arranged in the apparatus casing on which different sizes of paper P are stacked for each size, and a specification among the paper P stacked on the internal paper feed tray 13 A plurality of internal paper feed rollers 14 for picking up the fed paper P one by one and feeding it to the printing unit 30 are provided. The paper feeding unit 10 is disposed on the most upstream side of the transport path, and feeds the paper P having a size designated by the print job to the printing unit 30.

―Transport section―
The transport unit 20 is disposed near the junction of the paper feed path R4 and the reversing path R3, temporarily stops the paper P transported from the paper feed unit 10 or the reversing unit 50, and then performs skew correction and prints at a predetermined timing. A plurality of pairs of registration rollers 21 that are transported toward the section 30; suction transport means 22 that is disposed below the printing section 30 and transports the sheet P transported from the registration rollers 21 while being sucked and held at the center position; An upper surface transport roller 23 is provided that transports the paper P, which is composed of transport rollers and transported by the suction transport means 22, so as to make a U-turn from the right to the left along the normal path R2. The transport unit 20 transports the paper P in a predetermined direction in the circulation path R1.

―Printing Department―
The printing unit 30 corresponds to a plurality of colors of ink (four colors of black (K), cyan (C), magenta (M), and yellow (Y)) having a plurality of head blocks arranged in a staggered pattern along the width direction. The line-type inkjet heads are arranged in parallel to each other in the width direction from the upstream side to the downstream side in the paper conveyance direction. The printing unit 30 prints a predetermined image corresponding to the print job on the paper P conveyed by the conveyance unit 20.

―Output unit―
The paper discharge unit 40 includes a paper discharge table 41 on which the discharged paper P is stacked, and a paper discharge roller 42 that discharges the paper P conveyed by the upper surface conveyance roller 23 toward the paper discharge table 41. Yes. The paper discharge unit 40 is connected to the downstream end of the normal path R2 and discharges the printed paper P.

―Reversing part―
The reversing unit 50 temporarily transports the paper P, which has been transported by the upper surface transporting roller 23, to the switchback unit 52, and then transports the paper P to the refeed roller 53. The reversing unit 51 temporarily A switchback unit 52, which is a space for carrying in, a re-feed roller 53 for transporting the paper P transported by the reversing roller 51 to the registration roller 21, and a paper P transported from the upper transport roller 23 And a switching gate 54 for guiding the paper P carried out from the switchback portion 52 by the reverse roller 51 to the refeed roller 53. The reversing unit 50 is provided in the reversing path R3, and after reversing the front and back of the single-side printed paper P conveyed from the normal path R2, the direction reversing process is performed in which the front and rear in the conveying direction are switched while conveying the reversing path R3. Then, it is conveyed to the registration roller 21.

―Storage unit―
The storage unit 60 is composed of, for example, a flash memory, an HDD (Hard Disk Drive), and the like, and stores various information (computer program, application software, etc.) necessary for driving each unit of the inkjet printing apparatus 100, Temporarily store the set print job.

―Control part―
The control unit 70 is configured by a processor such as a CPU (Central Processing Unit), for example, and reads a computer program and various application software stored in the storage unit 60 to perform program processing, in addition to print processing based on a print job, Arithmetic processing necessary for control processing and various processing of the entire inkjet printing apparatus 100 is executed.

  Note that the control unit 70 has a built-in interface unit (not shown), receives a print job from an external terminal (not shown) via a communication network, and stores the received print job in the storage unit 60.

―Setting display section―
The setting display unit 80 is an input device including, for example, operation keys and a display / input panel, and is provided on the outside of the housing. The setting display unit 80 outputs an operation signal to the control unit 70 when a predetermined operation is performed when setting various setting information necessary for the inkjet printing apparatus 100 in addition to the setting of the print job by the user.

―Image reading part―
The image reading unit 90 includes a light source that emits light for irradiating a document, a CCD image sensor that receives reflected light from the document and performs photoelectric conversion, and optically reads an image of the document to generate image data. . The image reading unit 90 reads a document when using the copy function and the scanner function.

  The sheet conveying apparatus 1 according to the present invention is mounted as the suction conveying means 22 of the conveying unit 20 described above, and includes the intake area E1 and the exhaust area E2 according to the length (width dimension) in the width direction of the paper P. The ink is divided on the belt surface 4a to prevent ink mist generated when ink is discharged from the printing unit 30 from adhering to the belt surface 4a.

[Sheet Conveyor]
Next, the sheet conveying apparatus 1 according to the present invention will be described with reference to FIGS.
As shown in FIG. 2A or 2B, the sheet conveying apparatus 1 according to the present embodiment includes an endless suction conveying belt 4 that is stretched between a driving roller 2 and a driven roller 3, and a back surface of the suction conveying belt 4. The sheet P is composed of suction means 5 which is a negative pressure generating means for generating a negative pressure for sucking air near the belt surface 4a from the side.

  In the present embodiment, since the sheet conveying apparatus 1 of the present invention is mounted on the ink jet printing apparatus 100, the drive control of each part of the sheet conveying apparatus 1 is performed by the control unit 70 that performs overall control of the ink jet printing apparatus 100. However, a control unit dedicated to the sheet conveying apparatus 1 may be provided. In that case, the movement amount of the suction means 5 can be controlled according to the width dimension of the paper P by sharing the print job information with the control unit 70 of the inkjet printing apparatus 100.

  A plurality of ventilation holes 4 b for sucking air in the vicinity of the belt surface 4 a by the suction means 5 are formed on the belt surface 4 a of the suction conveyance belt 4. In the illustrated example, the vent holes 4b are formed in a row at a predetermined interval in parallel with the moving direction (conveying direction) of the suction conveyance belt 4, and a plurality of such columns are arranged along the width direction. ing.

  The sheet conveying apparatus 1 is disposed below the printing unit 30 and conveys the sheet P conveyed from the registration rollers 21 while being sucked and held on the suction conveying belt 4. Further, for example, an encoder (not shown) provided on the driven roller 3 is set so that the moving speed of the suction conveying belt 4 by the sheet conveying apparatus 1 (that is, the conveying speed of the paper P) becomes a conveying speed suitable for the contents of the print job. The number of rotations of a drive motor (not shown) connected to the drive roller 2 is controlled by the control unit 70 based on the output of

  Further, as shown in FIG. 2A, the belt surface 4a of the suction conveyance belt 4 is an area for sucking and exhausting air around the belt surface 4a in accordance with the width dimension of the paper P used in the print job. Are set as “intake area E1” and “exhaust area E2”.

  The suction area E1 is an area for sucking air around the belt surface 4a by the negative pressure of the suction means 5 in order to suck and suck the paper P on the belt surface 4a. It is set approximately the same as the passing area. The exhaust area E2 is an area for exhausting the air sucked in the intake area E1 from the bottom of the belt surface 4a to the outside, and the non-passing area (on the belt surface 4a on which the paper P does not pass during printing). In other words, this is an area where the paper P is not sucked and sucked.

  The suction means 5 is composed of a pair of suction fans in which an intake port 5a is disposed on the front side which is an opposing surface, and an exhaust port 5b is provided on the back side. The suction means 5 is provided so as to be relatively movable in the width direction (left and right direction in the figure) immediately below the belt surface 4a. Under the control of the control unit 70, the width dimension of the paper P used in the print job to be performed. Move in the width direction to match. Thus, the areas E1 and E2 are defined on the belt surface 4a.

  For example, as shown in FIG. 2B, the suction means 5 of the present embodiment is provided on a guide member (rail) 5 d provided along the width direction at a lower position in the inner portion surrounded by the suction conveyance belt 4. The sliding means is suitably slid in the left-right direction in the figure by the driving force of a driving means (such as a motor) (not shown) as long as the suction means 5 is movable in the width direction according to the width dimension of the paper P. However, it is not particularly limited to this configuration.

  Further, the suction means 5 is provided with a sorting member 5c that separates the intake area E1 and the exhaust area E2 on the belt surface 4a of the suction conveyance belt 4. The sorting member 5c of the present embodiment is provided on the side of each suction port 5a of the suction means 5, and extends from the vicinity of the carry-in side end of the suction conveyance belt 4 to the vicinity of the carry-out side end along the conveyance direction ( Hereinafter, it is also referred to as “partition plate 5c”.

  Further, the sorting member 5c is disposed with a predetermined gap (about several mm) so as not to hinder the rotational driving of the suction conveyance belt 4 during the conveyance of the paper. The dimension of the gap may be a dimension that allows at least the air sucked by the suction means 5 and the air exhausted by the suction means 5 to be separated from each other on the belt surface 4a.

  By moving the suction means 5 provided with the partition plate 5c in accordance with the width dimension of the paper P, as shown in FIG. 3, only the width dimension of the paper P on the belt surface 4a becomes the intake area E1. Air is sucked, and the air sucked in the suction area E1 from the exhaust area E2 in the area outside the width dimension of the paper P on the belt surface 4a is exhausted.

  As described above, the sheet conveying apparatus 1 according to the present invention has a pair of suction means 5 in which the intake ports 5a are arranged to face each other as the sorting means 6 that separates the intake area E1 and the exhaust area E2 set on the belt surface 4a. A partition plate 5c is installed on the side of the intake port 5a in the front, and the partition plate 5c is configured such that one or both of the partition plates 5c can be relatively moved in the width direction according to the width dimension of the sheet P immediately below the belt surface 4a of the suction conveyance belt 4. It has become.

  As a result, when the print job is performed, the suction means 5 is moved in the width direction so that the partition plate 5c comes to a position that matches the width dimension of the paper P, and the intake area E1 and the exhaust area E2 are separated on the belt surface 4a. The ink mist discharged at the time of printing is not sucked in the non-passage area of the paper P, and the contamination of the belt surface 4a is reduced.

  Note that the ink mist floating in the space between the printing unit 30 and the sheet conveying apparatus 1 by the ink ejected at the time of printing is exhausted to the outside by other exhaust means (not shown).

[About processing operations]
Next, an operation example during the printing process in the sheet conveying apparatus 1 mounted on the above-described inkjet printing apparatus 100 will be described with reference to FIGS. 4 (a) and 4 (b).
Here, after executing a print job for printing A4 paper as the paper P, a print job for printing A3 paper as the paper P is executed, and the long side of each paper P is in a state parallel to the transport direction (vertical direction). It is an operation example when it conveys.

  In addition, since the ink discharge process by the printing unit 30 by the ink jet printing apparatus 100 on which the sheet conveying apparatus 1 is mounted is the same as the processing content of the conventional apparatus, the description thereof is omitted.

  First, when a print job using A4 paper as the paper size is started, the control unit 70 relatively moves the suction unit 5 according to the width dimension of the paper P. Accordingly, the partition plate 5c moves so as to match the width dimension of the paper P when the A4 paper is conveyed in the vertical direction on the belt surface 4a.

  When a print job is executed, air is sucked and sucked from the intake area E1 which is a passage area of the A4 paper to be conveyed, and the paper P is sucked and sucked, and from the exhaust area E2 which is a non-passage area of the A4 paper. Exhaust air sucked in. Thereby, ink mist generated at the time of ink ejection does not adhere to the non-passage area of A4 paper on the belt surface 4a.

  Next, when the print job using A4 paper is completed and the next print job using A3 paper is executed, the suction unit 5 is first moved relative to the width dimension of the paper P. Accordingly, the partition plate 5c moves so as to match the width dimension of the paper P when the A3 paper is conveyed in the vertical direction on the belt surface 4a.

  When a print job is executed, air is sucked and sucked from the intake area E1 which is a passage area of the A3 paper to be conveyed, and the paper P is sucked and sucked, and from the exhaust area E2 which is a non-passage area of the A3 paper. Exhaust air sucked in.

  At this time, the A3 sheet is transported, but since the intake area E1 is set in accordance with the width dimension of the A4 sheet at the previous print job, the ink mist generated at the time of printing adheres to the exhaust area E2 of the belt surface 4a. Absent. For this reason, even if the print job increases in size, such as A4 paper → A3 paper, the back surface of the A3 paper is not contaminated with ink mist.

  As described above, the sheet conveying device 1 described above separates the intake area E1 and the exhaust area E2 set on the belt surface 4a, so that the intake air in the pair of suction means 5 arranged with the intake ports 5a facing each other is collected. A partition plate 5c is provided on the side of the opening 5a, and is provided with sorting means 6 in which one or both are relatively movable in the width direction in accordance with the width dimension of the paper P just below the belt surface 4a of the suction conveyance belt 4. Yes.

  Accordingly, the intake area E1 and the exhaust area E2 are divided on the belt surface 4a for each print job in accordance with the width dimension of the paper P. For example, a print job using a small size paper P (A4 paper). Since the ink mist can be reduced from adhering to the non-passing area of the belt surface 4a even when the print job is shifted to a print job using a large size paper P (A3 paper), the previous printing is performed. Ink stains do not adhere to the back side of A3 paper having a larger width than paper P used in the job.

  Further, since the non-passing area of the paper P is the exhaust area E2, there is an effect of preventing the ink mist generated when the ink is discharged due to the exhausted air from adhering to the belt surface 4a.

[Other embodiments]
In addition, this invention is not limited to embodiment mentioned above, For example, as shown below, according to a use environment etc., it can also change suitably and can implement. Moreover, the following modified examples can be implemented in any combination within a range not departing from the gist of the present invention.

  In the above-described embodiment, the configuration of the sorting unit 6 has been described with the configuration in which the pair of suction units 5 that are movable below the belt surface 4a along the width direction of the sheet P are provided with the partition plate 5c. Not.

  For example, as shown in FIG. 5 (a), as another configuration example of the sorting means 6, a partition plate 5c is installed on the back side of the belt surface 4a so as to be relatively movable in the width direction, and below the belt surface 4a. It is also possible to adopt a configuration in which the upper portions of the suction means 5 fixedly arranged with a predetermined interval are connected via a bellows-like connecting member 5d. In this embodiment, the partition plate 5c may be moved so that the interval between the partition plates 5c matches the width dimension of the paper P.

  Further, in the above-described embodiment, the air exhausted from the exhaust area E2 disturbs the airflow in the space between the printing unit 30 and the sheet conveying apparatus 1, and the ink ejected during the printing process is correctly applied to the printing surface of the paper P. When the printed image is disturbed without landing, as shown in FIG. 5B, the width direction of the partition plate 5c for separating the intake area E1 and the exhaust area E2 of the belt surface 4a is set to the outside. 5c may be further added, and a non-ventilation area E3 in which air is not sucked or exhausted may be provided between the intake area E1 and the exhaust area E2 on the belt surface 4a.

  This non-ventilated area E3 is set along the transport direction so that the passing area and the non-passing area of the paper P on the belt surface 4a are not adjacent to each other and are separated by a predetermined range. Disturbance of the airflow in the space is suppressed by the exhausted air, and displacement of the landing positions of ink droplets (disturbance of the printed image) due to the disturbance of the airflow can be prevented.

DESCRIPTION OF SYMBOLS 1 ... Sheet conveying apparatus 2 ... Drive roller 3 ... Driven roller 4 ... Suction conveyance belt (4a ... Belt surface, 4b ... Vent hole)
5 ... a pair of suction means (5a ... suction port, 5b ... exhaust port, 5c ... sorting member (partition plate), 5d ... guide member (rail), 5e ... connecting member)
6 ... Sorting means 10 ... Paper feed unit 20 ... Conveying unit 30 ... Printing unit 40 ... Paper discharge unit 50 ... Reversing unit 60 ... Storage unit 70 ... Control unit 80 ... Setting display unit 90 ... Image reading unit 100 ... Inkjet printing apparatus P ... Paper (sheet) as recording medium
E1 ... Intake area E2 ... Exhaust area E3 ... Non-ventilated area

Claims (3)

An endless suction conveyance belt provided with a plurality of ventilation holes;
A suction means for sucking air from the back surface side of the belt through the vent hole and sucking and holding the sheet on the belt surface;
In a sheet conveying apparatus comprising:
The passage area of the sheet on the belt surface of the suction conveyance belt is an intake area of the suction means, and the non-passage area of the sheet on the suction conveyance belt is an exhaust area of the suction means,
A sheet conveying apparatus, comprising: a sorting unit that adjusts the intake area or the exhaust area according to a sheet width of the sheet to divide each area.   The sorting means includes a pair of partition plates whose intervals can be adjusted so that the intake area and the exhaust area are divided according to the sheet width of the sheet on the back side of the suction conveyance belt. The sheet conveying apparatus according to claim 1.   The sheet conveying apparatus according to claim 1, wherein the sorting unit forms a non-ventilated area that is not sucked or exhausted by the suction unit between the intake area and the exhaust area.

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