Transportation Defect Judgment Device and Printing Device

Abstract

The present invention provides a conveyance defect determination device and a printing device that can reduce the workload of users for conveyance defects. The device includes: a warping detection unit (70) provided between a printing unit (30) that performs printing processing on a printing medium (P) and a supply unit (a lateral paper supply unit (10) and an internal paper supply unit (20)) that supplies the printing medium to the printing unit, and configured to detect warping of the printing medium supplied from the supply unit; and a determination unit (61) configured to determine conveyance defects of the printing medium based on the detection result of the warping detection unit. During a period from the start of supply of the printing medium from the supply unit until a preset number of sheets are supplied, even if warping of the printing medium is detected, the determination unit does not determine it as a conveyance defect. However, when warping of the printing medium is detected starting from the time point of the next printing medium after the preset number of sheets have been supplied, the determination unit determines it as a conveyance defect.

Description

Technical Field

[0001] The present invention relates to a conveyance defect determination device and a printing device that determine conveyance defects based on the detection result of warping of a printing medium. Background Art

[0002] Conventionally, a scheme has been proposed in which a detection unit such as a sensor for detecting a printing medium is provided on a conveyance path of the printing medium of a printing device, and predetermined control is performed based on the detection result of the detection unit.

[0003] For example, in Patent Document 1, a scheme has been proposed in which the length of the printing medium initially conveyed is measured by a detection unit, and when the measured length is longer than a preset length, the feeding of the second printing sheet is stopped.

[0004] In addition, in Patent Document 2, a scheme has been proposed in which the front end of a printing medium is detected, and the surface of the printing medium continuous with the front end is photographed, thereby detecting whether the surface of the printing medium has been printed. When printing is completed, the operation of the device is stopped.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2008-230828

[0008] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2011-112814 Summary of the Invention

[0009] Problems to be Solved by the Invention

[0010] Incidentally, for example, when using a manual paper feed tray of a printing device, there is a case where a user inadvertently deforms a printing medium to cause a so-called warping of the printing medium. Warping of a printing medium refers to a state in which the printing medium warps and lifts from its original conveyance path (conveyance surface).

[0011] When such warping occurs and the warping is simply detected by a detection unit provided on the conveyance path and determined as a conveyance defect to stop the paper feeding of the printing device, etc., there are problems such as frequent stoppages of the printing device and a high operation load on the user for conveyance defects.

[0012] In view of the above circumstances, an object of the present invention is to provide a conveyance defect determination device and a printing device that can reduce the operation load on the user for conveyance defects.

[0013] Means for Solving the Problems

[0014] The conveyance defect determination device of the present invention includes: a warping detection unit that is disposed between a printing unit that performs printing processing on a printing medium and a supply unit that supplies the printing medium to the printing unit, and detects warping of the printing medium supplied from the supply unit; and a determination unit that determines conveyance defects of the printing medium based on the detection result of the warping detection unit. During the period from the start of supply of the printing medium from the supply unit until a preset number of sheets are supplied, even if warping of the printing medium is detected, the determination unit does not determine it as a conveyance defect. However, when warping of the printing medium is detected at the time point of the next printing medium after the preset number of sheets have been supplied, the determination unit determines it as a conveyance defect.

[0015] Advantages of the Invention

[0016] According to the conveyance defect determination device of the present invention, during the period from the start of supply of the printing medium from the supply unit until a preset number of sheets are supplied, even if warping of the printing medium is detected, it is not determined as a conveyance defect. However, when warping of the printing medium is detected at the time point of the next printing medium after the preset number of sheets have been supplied, it is determined as a conveyance defect. Therefore, it is possible to reduce the workload of the user for conveyance defects. Description of the Drawings

[0017] Figure 1 is a diagram showing a schematic configuration of an embodiment of an inkjet printing device of the present invention.

[0018] Figure 2 is a diagram showing Figure 1 a schematic configuration of a control system of the inkjet printing device shown.

[0019] Figure 3 For Figure 1 a flowchart for explaining a method for determining conveyance defects of a printing medium in the inkjet printing device shown.

[0020] Description of Reference Numerals:

[0021] 1: Inkjet printing device; 10: Side paper feeding unit; 11: Paper feeding table; 12: Primary paper feeding unit; 14: Secondary paper feeding unit; 14a: Registration roller; 20: Internal paper feeding unit; 21a, 21b, 21c: Paper feeding tables; 22a, 22b, 22c: Primary paper feeding units; 30: Printing unit; 31 Line head; 32: Conveyor belt; 33: First belt impression roller; 34: Second belt impression roller; 40: Paper discharging unit; 41: Paper discharging table; 42: Paper discharging roller; 43: Switching mechanism; 50: Inverting unit; 51: Inverting table; 52: Inverting roller; 53: Conveyor roller; 60: Control unit; 61: Judgment unit; 70: Warping detection unit; 70a: Oscillating unit; 70b: Oscillation sensor unit; 70c: Support shaft; CR: Circulating conveyance path; FR: Paper feeding conveyance path; SR: Inverting conveyance path; P: Printing medium. Detailed implementation mode

[0022] Hereinafter, an inkjet printing device according to an embodiment of the conveyance defect determination device using the present invention will be described in detail with reference to the accompanying drawings. The inkjet printing device according to the present embodiment is characterized by a method for determining conveyance defects of a printing medium. First, its overall structure will be described. Figure 1 It is a diagram showing a schematic structure of the inkjet printing device 1 according to the present embodiment. It should be noted that Figure 1 The up-down, left-right directions shown are the up-down, left-right directions of the inkjet printing device 1 according to the present embodiment. In addition, Figure 1 The front side near the paper surface is the front, and the back side of the paper surface is the back.

[0023] As Figure 1 shown, the inkjet printing device 1 according to the present embodiment includes a side paper feeding unit 10, an internal paper feeding unit 20, a printing unit 30, a paper discharging unit 40, and an inverting unit 50. It should be noted that in the present embodiment, the side paper feeding unit 10 and the internal paper feeding unit 20 correspond to the supply unit of the present invention.

[0024] The printing unit 30 and the internal paper feeding unit 20 are housed in a housing formed of metal, resin, or the like. In addition, the side paper feeding unit 10 and the paper discharging unit 40 are provided in a state where a part is housed in the housing and a part protrudes outside the housing.

[0025] The side paper feeding unit 10 is a so-called manual paper feeding tray, and includes a paper feeding table 11 for placing the printing medium P, a primary paper feeding unit 12 for extracting and conveying only the uppermost printing medium P from the paper feeding table 11, and a secondary paper feeding unit 14 for sending the printing medium P conveyed by the primary paper feeding unit 12 to the printing unit 30 at a predetermined timing.

[0026] The secondary paper feeding unit 14 includes a positioning roller 14a and a positioning motor (not shown) that drives the positioning roller 14a. The positioning roller 14a abuts against the front end of the printing medium P transported from the primary paper feeding unit 12 or the printing medium P transported from the internal paper feeding unit 20 to temporarily stop the printing medium P to form slack, thereby performing skew correction.

[0027] The internal paper feeding unit 20 includes a paper feeding table 21a for placing the printing medium P, a primary paper feeding unit 22a that extracts only the uppermost printing medium P from the paper feeding table 21a and transports it onto the paper feeding path FR, a paper feeding table 21b for placing the printing medium P, a primary paper feeding unit 22b that extracts only the uppermost printing medium P from the paper feeding table 21b and transports it onto the paper feeding path FR, a paper feeding table 21c for placing the printing medium P, and a primary paper feeding unit 22c that extracts only the uppermost printing medium P from the paper feeding table 21c and transports it onto the paper feeding path FR.

[0028] As described above, in the secondary paper feeding unit 14, the printing medium P is transported from the side paper feeding unit 10 or the internal paper feeding unit 20, and the printing medium P is also transported from the later-described reversing unit 50.

[0029] Therefore, near the secondary paper feeding unit 14 in the transport direction, there is a convergence point where the transport path of the printing medium P supplied from the side paper feeding unit 10 or the internal paper feeding unit 20 converges with the transport path of the printing medium P with one side printed and transported from the reversing unit 50. Based on this convergence point, the path on the paper feeding mechanism side is called the paper feeding path FR, and the other paths are called the circulation transport paths CR.

[0030] In addition, a plurality of paper detection sensors (not shown) for detecting the printing medium P are provided on the circulation transport path CR. Based on the detection signals detected by the paper detection sensors, the transport control of the printing medium P is performed by the later-described control unit 60.

[0031] The printing unit 30 includes four line heads 31, an annular transport belt 32 arranged opposite to the line heads 31, a first belt impression roller 33, and a second belt impression roller 34.

[0032] The transport belt 32 is formed of an annular endless belt and has a plurality of suction holes. The printing medium P supplied from the secondary paper feeding unit 14 is transported to the annular transport belt 32. Then, the printing medium P is adsorbed on the transport belt 32 by the suction of a suction fan (not shown) provided on the back side of the transport path surface of the transport belt 32 and is transported at a predetermined transport speed. Then, while transporting the printing medium P through the transport belt 32, ink is ejected from the line heads 31 onto the printing medium P, thereby performing a printing process on the printing medium P.

[0033] A conveying belt 32 is mounted on a first belt impression roller 33 and a second belt impression roller 34. The first belt impression roller 33 and the second belt impression roller 34 are driven by a conveying motor (not shown), whereby the conveying belt 32 rotates and moves in the Figure 1 clockwise direction.

[0034] In addition, a warping detection unit 70 is provided between the conveying belt 32 and the positioning roller 14a. The warping detection unit 70 detects warping of the printing medium P and includes a swinging unit 70a and a swinging sensor unit 70b.

[0035] The swinging unit 70a is a member extending in a direction (front-rear direction) orthogonal to the conveying direction of the printing medium P. The cross-section of the surface of the swinging unit 70a orthogonal to its extending direction is formed in a crank shape.

[0036] The swinging unit 70a is supported by a support shaft 70c extending in the conveying direction of the printing medium P so as to be rotatable and is supported so as to be swingable in the Figure 1 direction of the arrow A shown and the opposite direction. When warping occurs in the printing medium P conveyed from the positioning roller 14a, the front end in the conveying direction of the printing medium P contacts one end of the swinging unit 70a, whereby the swinging unit 70a is pushed forward and swings in the direction of the arrow A. By this swinging, the other end of the swinging unit 70a separates from the swinging sensor unit 70b. Thereby, it is possible to detect that the warping of the printing medium P is equal to or more than a predetermined amount.

[0037] The swinging unit 70a is arranged such that the printing medium P passes under the swinging unit 70a when no warping occurs in the printing medium P or when the warping is less than a predetermined amount. It should be noted that the distance between one end of the swinging unit 70a and the conveying belt 32 is set to be equal to or less than the distance between each line head 31 and the conveying belt 32, whereby collision between the printing medium P and each line head 31 can be prevented.

[0038] In addition, for example, when the maximum size among the sizes of the printing medium P to be used is the A3 size, the length L of the swinging unit 70a in the direction orthogonal to the conveying direction of the printing medium P is set to be longer than the length of the A3 size in the direction orthogonal to the conveying direction.

[0039] The swinging sensor unit 70b detects contact and non-contact of the swinging unit 70a as described above and outputs the detection signal to the control unit 60. A determination unit 61 (described later) in the control unit 60 determines conveyance failure of the printing medium P based on the detection result of the warping detection unit 70. The determination method thereof will be described in detail later.

[0040] Each line head 31 extends in a direction orthogonal to the conveyance direction of the printing medium P, and ejects ink onto the printing medium P conveyed by the conveyance belt 32. As Figure 1 shown, four line heads 31 are arranged at predetermined intervals along the conveyance path of the printing medium P. The four line heads 31 eject CMYK inks respectively.

[0041] The printing medium P printed by the printing unit 30 is conveyed on the circulation conveyance path CR by conveyance rollers etc. arranged on the circulation conveyance path CR. A switching mechanism 43 is provided on the circulation conveyance path CR, and this switching mechanism 43 switches whether the printing medium P to be conveyed on the circulation conveyance path CR is guided to the paper discharge unit 40 or recycled on the circulation conveyance path CR. Specifically, the switching mechanism 43 switches between the conveyance path on the paper discharge unit 40 side and the conveyance path on the reversing unit 50 side.

[0042] The paper discharge unit 40 has a paper discharge table 41 formed in a tray shape protruding from the housing of the inkjet printing apparatus 1, and a pair of paper discharge rollers 42 that discharge the printing medium P onto the paper discharge table 41. Moreover, the printing medium P guided toward the paper discharge unit 40 by the switching mechanism 43 is discharged onto the paper discharge table 41 by the paper discharge rollers 42.

[0043] The reversing unit 50 includes a reversing table 51, reversing rollers 52, a reversing motor (not shown) that drives the reversing rollers 52, etc. The reversing table 51 has a reversing conveyance path SR for reversing the printing medium P. The reversing rollers 52 convey the printing medium P from the circulation conveyance path CR to the reversing table 51, and return the printing medium P conveyed to the reversing table 51 to the circulation conveyance path CR again.

[0044] The printing medium P guided to the reversing unit 50 by the switching mechanism 43 is conveyed from the circulation conveyance path CR to the reversing table 51 by the reversing rollers 52, and returns from the reversing table 51 to the circulation conveyance path CR again, and thus is conveyed on the circulation conveyance path CR in a state of being reversed on both sides. Then, the printing medium P after being reversed on both sides is conveyed again toward the printing unit 30 by a plurality of rollers such as conveyance rollers 53 provided on the circulation conveyance path CR.

[0045] The printing medium P conveyed by the conveyance roller 53 is conveyed again to the registration roller 14a of the secondary paper supply unit 14, and is sent again to the printing unit 30 by the registration roller 14a at a predetermined timing. Then, after passing under the swing unit 70a, the printing unit 30 performs printing processing on the back surface of the printing medium P.

[0046] Figure 2 is a block diagram showing a schematic configuration of the control system of the inkjet printing apparatus 1 of the present embodiment.

[0047] The control unit 60 controls the entire inkjet printing apparatus 1 and includes a CPU (Central Processing Unit) and a semiconductor memory, etc. The control unit 60 controls the operations of each part of the inkjet printing apparatus 1 by causing the CPU to execute a program pre-stored in the semiconductor memory.

[0048] In addition, the control unit 60 acquires image data output from a computer or the like or image data read by a scanner or the like, and based on this image data, implements a printing process by controlling the printing unit 30.

[0049] In addition, the control unit 60 includes a determination unit 61. The determination unit 61 determines the conveyance defect of the printing medium P based on the detection result of the warping detection unit 70. Moreover, when the determination unit 61 determines that there is a conveyance defect, the control unit 60 stops the operations of the supply systems such as the side paper supply unit 10, the internal paper supply unit 20, and the reversing unit 50, or stops the operations of the supply system and the printing unit 30.

[0050] Specifically, the determination unit 61 of the present embodiment has a counter that counts the number of sheets of the printing medium P supplied from the side paper supply unit 10 or the internal paper supply unit 20. Moreover, during the period from the start of the supply of the printing medium P related to a predetermined printing task until a preset number of sheets are supplied, even if warping of the printing medium P is detected, the determination unit 61 does not determine that there is a conveyance defect.

[0051] In addition, after the time point of the next printing medium P after the above preset number of sheets are supplied, when warping of the printing medium P is detected, the determination unit 61 determines that there is a conveyance defect.

[0052] In the present embodiment, the above preset number of sheets is set to one sheet. That is, when the supplied printing medium P is the first (first sheet) printing medium P related to a predetermined printing task, even if warping of this printing medium P is detected, the determination unit 61 does not determine that there is a conveyance defect, but directly continues the conveyance and printing process of the printing medium P. On the other hand, when the supplied printing medium P is the printing medium after the second sheet related to a predetermined printing task, when warping is detected, the determination unit 61 determines that there is a conveyance defect.

[0053] In this way, for the first (first sheet) printing medium P that is easily deformed inadvertently, even if warping of this printing medium P is detected, it is not determined that there is a conveyance defect, and when warping is detected for the printing medium after the second sheet, it is determined that there is a conveyance defect, thereby being able to reduce the user's operation load caused by conveyance defects.

[0054] Further, the determination unit 61 acquires the attribute information of the supplied printing medium P, and switches the determination method for conveyance defects based on the attribute information. The attribute information of the printing medium P refers to information on the properties to which the printing medium P belongs. For example, there is information on the hardness, thickness, and size of the printing medium P, etc., but it may also be other information. The attribute information of the printing medium P can be acquired from the setting information included in the printing task, or can be acquired from the information set and input on an operation panel (not shown) provided in the inkjet printing apparatus 1.

[0055] The determination unit 61 of the present embodiment acquires information on the type of paper of the printing medium P (plain paper, coated paper, high-quality paper, special paper, thick paper, etc.) as the information on the hardness of the printing medium P. Then, when the acquired information on the type of paper is information on the type of soft paper, as described above, in the case of the first (first sheet) printing medium, even if warping of the printing medium P is detected, the determination unit 61 does not determine it as a conveyance defect, while in the case of the second sheet and subsequent printing media, when warping is detected, the determination unit 61 determines it as a conveyance defect (corresponding to the first determination method of the present invention).

[0056] On the other hand, when the acquired information on the type of paper is not information on the type of soft paper, that is, when it is information indicating a paper type with a hardness equal to or greater than a predetermined hardness, regardless of which sheet the supplied printing medium P is, that is, even in the case of the first (first sheet) printing medium, when warping of the printing medium P is detected, the determination unit 61 determines it as a conveyance defect (corresponding to the second determination method of the present invention).

[0057] When the printing medium P is hard, there is a risk of damage such as collision between the printing medium P and the line head 31. Therefore, by determining it as a conveyance defect from the first printing medium P as described above, damage to the line head 31 and the like can be prevented.

[0058] It should be noted that in the present embodiment, the first determination method and the second determination method are switched according to the hardness of the printing medium P, but it is not limited thereto, and the first determination method and the second determination method may also be switched based on the thickness information of the printing medium P. Specifically, the determination unit 61 may also use the first determination method to determine conveyance defects when the information on the type of paper is thin paper, and use the second determination method to determine conveyance defects when it is thick paper.

[0059] In addition, the relationship between the attribute information of the printing medium P and the first determination method or the second determination method is preset in the determination unit 61. The determination unit 61 switches between the first determination method and the second determination method based on the obtained attribute information of the printing medium P (such as the type information of the paper) and the above relationship.

[0060] Next, refer to Figure 3 The flowchart shown is used to explain the method for determining the conveyance defect of the printing medium P in the inkjet printing apparatus 1 of the present embodiment. It should be noted that in the flowchart, the paper after passing through the flipping path during double-sided printing is not included in the counted quantity.

[0061] First, the control unit 60 waits for a printing instruction for a printing task ("No" in S10). When a printing instruction is received ("Yes" in S10), the supply of the printing medium P is started. Specifically, the control unit 60 starts supplying the printing medium P from the side paper supply unit 10 or the internal paper supply unit 20 to the printing unit 30 (S12).

[0062] Then, the determination unit 61 monitors whether the warping of the printing medium P is detected by the warping detection unit 70 (S14), that is, monitors whether a detection signal of the printing medium P is output from the swing sensor unit 70b. When the determination unit 61 detects the warping of the printing medium P ("Yes" in S14), it confirms whether the printing medium P is a soft printing medium (S16).

[0063] Next, when the printing medium P is a soft printing medium ("Yes" in S16), the determination unit 61 confirms whether the printing medium P is the second and subsequent printing media of the printing task (S18). When the printing medium P is not the second and subsequent printing media of the printing task ("No" in S18), that is, when it is the first (first sheet) printing medium of the printing task, the determination unit 61 does not determine it as a conveyance defect (first determination method) and returns to S14 to monitor the warping of the second and subsequent printing media again (S14). For the first printing medium P, it is directly conveyed to the printing unit 30 for printing processing.

[0064] On the other hand, in S18, when it is confirmed that it is the second and subsequent printing media of the printing medium P ("Yes" in S18), the determination unit 61 determines it as a conveyance defect, and the control unit 60 stops the operations of the supply system and the printing unit 30 according to this determination result (S20). That is, the operations of the supply system and the printing unit 30 are stopped due to the warping of the printing medium P. Moreover, for example, after removing the printing medium P with warping, the control unit 60 starts supplying the printing medium P from the supply system again. It should be noted that at this time, the counter used to confirm whether it is the second and subsequent printing media in S18 is reset and starts counting from "1" again.

[0065] In addition, in S16, when it is confirmed by the determination unit 61 that the printing medium P is not a soft printing medium ( "No" in S16), the determination unit 61 determines that there is a handling defect regardless of whether the printing medium P is the first (the first sheet) printing medium P of the printing task (the second determination method), and the control unit 60 stops the operations of the supply system and the printing unit 30. Moreover, in this case, the counter for confirming whether it is the printing medium P after the second sheet in S18 is also reset and starts counting from "1" again.

[0066] In addition, in S14, when the warping of the printing medium P is not detected ( "No" in S14) and the processing of the printing task has not ended ( "No" in S22), it returns to S14, and the determination unit 61 monitors the warping of the sequentially supplied printing medium P. Moreover, when the processing of the printing task ends in a state where the warping of the printing medium P is not detected ( "Yes" in S22), the control unit 60 directly stops the operations of the supply system and the printing unit 30 and ends the processing (S20).

[0067] As in the above-described embodiment, by switching between the first determination method and the second determination method based on the softness (hardness) of the printing medium P, the first determination method is adopted when the printing medium P is relatively soft, thereby enabling the reduction of the user's workload caused by the occurrence of handling defects. On the other hand, when the printing medium P is relatively hard, by adopting the second determination method, damage to the line head 31 caused by the collision between the printing medium P and the line head 31 can be prevented.

[0068] In addition, in the above-described embodiment, when the printing medium P is relatively soft, for the first printing medium P, even if warping is detected, it is not determined as a handling defect, while when warping is detected for the printing medium P after the second sheet, it is determined as a handling defect. However, the number of sheets of the printing medium P that is not determined as a handling defect even if warping is detected is not limited to one sheet, and can also be set to two or more sheets.

[0069] In addition, the number of sheets of the printing medium P that is not determined as a handling defect even if warping is detected can also be changed based on the attribute information of the printing medium P. The above-described embodiment is an example in which when the printing medium P is relatively soft, the number of sheets of the printing medium P that is not determined as a handling defect is set to one sheet, and when the printing medium P is relatively hard, the number of sheets of the printing medium P that is not determined as a handling defect is set to zero sheets, but it is not limited thereto. When the printing medium P is relatively soft, the number of sheets of the printing medium P that is not determined as a handling defect can be set to two sheets, and when the printing medium P is relatively hard, the number of sheets of the printing medium P that is not determined as a handling defect can be set to one sheet.

[0070] In this way, the number of sheets of the printing medium P that are not determined as handling defects even when warping is detected is changed based on the hardness of the printing medium P, thereby enabling both a reduction in the workload of the user for handling defects and prevention of damage to the line head 31.

[0071] In addition, when the printing medium P is thin, the number of sheets of the printing medium P that are not determined as handling defects can be set to two, and when the printing medium P is thick, the number of sheets of the printing medium P that are not determined as handling defects can be set to one. That is, the number of sheets of the printing medium P that are not determined as handling defects can also be changed based on the attribute information of the printing medium P.

[0072] In this way, the number of sheets of the printing medium P that are not determined as handling defects even when warping is detected is changed based on the thickness of the printing medium P, thereby enabling both a reduction in the workload of the user for handling defects and prevention of damage to the line head 31.

[0073] In addition, for example, when the size of the printing medium P is large, it becomes a case where the length in the direction (front-rear direction) orthogonal to the conveying direction of the printing medium P is longer than the length of each line head 31 in the above orthogonal direction. Thus, when the size of the printing medium P is large, even if warping occurs at both end portions (end portions extending in the conveying direction) of the printing medium P in the above orthogonal direction, since the warping is outside the setting range of the line head 31, it will not collide with the line head 31 and can be conveyed without problems.

[0074] Therefore, when the size of the printing medium P is equal to or larger than a preset size (for example, A3 size), the determination unit 61 may also not determine it as a handling defect regardless of the detection result of the warping detection unit 70 from the start of supply of the printing medium P for a predetermined printing task.

[0075] Thereby, useless stops of the inkjet printing apparatus 1 can be reduced, and a reduction in the workload of the user for handling defects can be achieved.

[0076] In addition, in the above-described embodiment, for the plurality of paper supply units (lateral paper supply unit 10, internal paper supply unit 20) provided in the inkjet printing apparatus 1, handling defect determination control is performed without distinguishing them, but the handling defect determination control of the present invention may also be performed only when using the lateral paper supply unit 10 (manual tray) where paper warping is likely to occur.

[0077] Regarding the handling defect determination apparatus of the present invention, the following supplementary note is further disclosed.

[0078] (Supplementary Note)

[0079] In the conveyance defect determination device of the present invention, it is possible that the determination unit changes a preset number of sheets that are not determined as conveyance defects even when warping of the printing medium is detected, based on the attribute information of the printing medium.

[0080] In addition, in the conveyance defect determination device of the present invention, it is possible that the determination unit switches between a first determination method and a second determination method based on the attribute information of the printing medium. In the first determination method, even when warping of the printing medium is detected during the period until a preset number of sheets are supplied, it is not determined as a conveyance defect. In the second determination method, from the start time point of supply of the printing medium from the supply unit, when warping is detected, it is determined as a conveyance defect.

[0081] In addition, in the conveyance defect determination device of the present invention, it is possible that when the attribute information is information indicating that the printing medium is a printing medium having a predetermined hardness or more, the determination unit switches to the second determination method.

[0082] In addition, in the conveyance defect determination device of the present invention, it is possible that when the attribute information is information indicating that the printing medium is a printing medium having a predetermined thickness or more, the determination unit switches to the second determination method.

[0083] In addition, in the conveyance defect determination device of the present invention, it is possible that when the attribute information is information indicating that the printing medium is a printing medium having a predetermined size or more, even when warping of the printing medium is detected from the start of supply of the printing medium from the supply unit, the determination unit does not determine it as a conveyance defect.

[0084] The printing device of the present invention includes the above-described conveyance defect determination device, supply unit, and printing unit of the present invention.

Claims

1. A transporting defect determination device, characterized in that: The transporting defect determination device includes: A warping detection unit, which is provided between a printing unit that performs printing processing on a printing medium and a supply unit that supplies the printing medium to the printing unit, and detects warping of the printing medium supplied from the supply unit; And A determination unit, which determines a transporting defect of the printing medium based on the detection result of the warping detection unit. During the period from the start of supply of the printing medium from the supply unit until a preset number of sheets are supplied, even if warping of the printing medium is detected, the determination unit does not determine it as a transporting defect. However, when warping of the printing medium is detected starting from the time point of the next printing medium after the preset number of sheets have been supplied, the determination unit determines it as a transporting defect. The determination unit changes the preset number of sheets based on the attribute information of the printing medium.

2. The transporting defect determination device according to claim 1, wherein: The determination unit switches between a first determination method and a second determination method based on the attribute information of the printing medium. In the first determination method, even if warping of the printing medium is detected during the period until the preset number of sheets are supplied, it is not determined as a transporting defect. In the second determination method, starting from the time point of supply of the printing medium from the supply unit, when warping is detected, it is determined as a transporting defect.

3. The handling defect determination device according to claim 2, wherein, When the attribute information is information indicating that the printing medium is of a predetermined hardness or more, the determination unit switches to the second determination method.

4. The handling defect determination device according to claim 2, wherein, When the attribute information is information indicating that the printing medium is of a predetermined thickness or more, the determination unit switches to the second determination method.

5. The handling defect determination device according to claim 1, wherein, When the attribute information of the printing medium is information indicating that the printing medium is of a predetermined size or more, starting from the start of supply of the printing medium from the supply unit, even if warping of the printing medium is detected, the determination unit does not determine it as a transporting defect.

6. A printing device, characterized in that, The printing device includes the transporting defect determination device according to any one of claims 1 to 5, the supply unit, and the printing unit.

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