Image forming apparatus and method for determining conveyance amount for image forming apparatus

Abstract

To provide an image forming apparatus capable of controlling the transportation of cloth through feedback of an appropriate correction value.SOLUTION: An image forming apparatus 1 comprises a plurality of transport rollers for holding and transporting a cloth 7, an ink jet head 62 for printing on the cloth, a texture detection sensor 61 for detecting the expansion and contraction state of the cloth 7 between an upstream transport roller 45a and a downstream transport roller 46 as a couple disposed at an opposed position across the ink jet head 62, a scanning unit 5 for scanning the ink jet head 62 and the texture detection sensor 61 in the cloth width direction, and a correction controller 2 for determining the amount of subsequent transportation based on the expansion and contraction state of the cloth 7 detected by the texture detection sensor 61.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an image forming apparatus that forms an image by feeding a fabric, and a method for determining a feed amount for the image forming apparatus. [Background technology]

[0002] In an inkjet printer, there is a device and method for feeding a fabric with an appropriate tension, which reads the stretch and wrinkle state of the fabric with a non-contact detector such as a CCD (Charge Coupling Device) camera and corrects the feed amount.

[0003] □ Patent document 1 describes a fabric printing system, and paragraph 0029 of this document states that "Three or five area CCD arrays 134 can be arranged laterally across the web (sheet) of fabric 114 and used to monitor the spatial frequency change of the tissue pattern as a function of induced tensions Tx, Ty in both the X and Y directions." [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-277995 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the area CCD array described in Patent Document 1, which is a camera fixed in the width direction, detects the state of the fabric at a location away from the area where the actual printing process is performed, and corrects the transport process. Therefore, the correction accuracy decreases due to fluctuation factors in the transport of the fabric after the correction. Therefore, the fabric printing system (image forming device) cannot appropriately control the transport of the fabric.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an image forming apparatus and a method for determining a transport amount for an image forming apparatus, which provide feedback of an appropriate correction value to control transport of the cloth. [Means for solving the problem]

[0007] That is, the above-mentioned object of the present invention is achieved by the following configuration.

[0008] (1) A plurality of conveying rollers for gripping and conveying the cloth; A printing unit that prints on the cloth; a cloth state sensor for detecting the number of wefts of the cloth between a pair of conveying rollers disposed at positions opposite to each other with the printing unit therebetween; a scanning unit that scans the printing unit and the cloth condition sensor over the entire area in the cloth width direction; a controller unit that determines a next feed amount based on the stretch state of the cloth detected by the cloth state sensor; An image forming apparatus comprising: (2) a plurality of conveying rollers for gripping and conveying the cloth; A printing unit that prints on the cloth; a cloth condition sensor that detects a stretching state of the cloth between a pair of conveying rollers that are disposed at positions opposite to each other with the printing unit therebetween; a scanning unit that scans the printing unit and the cloth condition sensor over the entire area in the cloth width direction; a controller unit that determines a next feed amount based on the stretch state of the cloth detected by the cloth state sensor; a carriage on which the printing unit and the cloth condition sensor are mounted; An image forming apparatus comprising: (3) a plurality of conveying rollers for gripping and conveying the cloth; A printing unit that prints on the cloth; Between a pair of conveying rollers disposed at positions facing each other across the printing unit, Before A fabric condition sensor capable of counting the number of wefts of the fabric; a scanning unit that scans the printing unit and the cloth condition sensor over the entire area in the cloth width direction; a controller unit that determines a next feed amount based on the stretch state of the cloth detected by the cloth state sensor; An image forming apparatus comprising: (4) a plurality of conveying rollers for gripping and conveying the cloth; A printing unit that prints on the cloth; a cloth state sensor that captures an image of the surface of the cloth between a pair of conveying rollers that are disposed at positions opposite to each other with the printing unit therebetween; a controller unit that counts the number of wefts of the cloth included in the captured image captured by the cloth condition sensor and determines a next conveyance amount based on the counted number of wefts; An image forming apparatus comprising: (5) The plurality of conveying rollers include downstream conveying rollers disposed on the downstream side and upstream conveying rollers disposed on the upstream side, The controller unit controls the downstream transport rollers to transport the cloth by the printing width of the printing unit, and controls the upstream transport rollers to transport the cloth by the counted number of wefts. The image forming apparatus according to (4) above.

[0009] ( 6 ) the cloth condition sensor detects tension on an upstream side of the printing unit in a conveying direction of the cloth. (1) Any of (3) 2. The image forming apparatus according to claim 1 .

[0010] ( 7 ) The conveying roller has a grip structure for gripping the cloth. (1) Any of (4) 2. The image forming apparatus according to claim 1 .

[0011] ( 8 ) The conveying unit further includes a motor capable of controlling an amount of rotation of the conveying roller. (1) to ( 4 ) The image forming apparatus according to any one of the above.

[0012] beforeThe fabric state sensor is a fabric grain detection sensor that counts the number of weft threads of the fabric. It is preferred .

[0013] before The cloth condition sensor detects the state of the cloth at a plurality of points in the cloth width direction, the controller unit determines the amount of fabric to be fed based on data of a plurality of points detected by the fabric condition sensor. It is preferred .

[0014] ( 10 ) The fabric condition sensor is provided upstream of the printing unit. (1) to ( 4 ) The image forming apparatus according to any one of the above.

[0015] before The printing unit and the cloth condition sensor are provided on the carriage. It is preferred .

[0016] ( 11 ) the cloth condition sensor detects the condition of the cloth between the upstream roller immediately adjacent to the printing unit and the printing unit; (1) to ( 4 ) The image forming apparatus according to any one of the above.

[0017] before A fabric state sensor capable of counting the number of wefts of the fabric; It is preferred .

[0018] (1 2 ) The fabric condition sensor includes a light source for illuminating the fabric. (1) to ( 4 ) The image forming apparatus according to any one of the above.

[0019] (1 3 ) a conveying mechanism for intermittently conveying the cloth by a pair of conveying rollers which grip the cloth immediately before and immediately after the cloth condition sensor; the controller unit controls the conveying mechanism so as to set the tension of the cloth to a predetermined value based on the stretch state of the cloth detected by the cloth state sensor. (1) to ( 4 ) The image forming apparatus according to any one of the above.

[0020] (1 4 ) The conveying roller has a grip structure for gripping the cloth. (1 3 ) The image forming apparatus according to claim 1 .

[0021] (1 5 ) A stepping motor capable of controlling the rotation amount of the conveying roller is provided. (1 3 ) The image forming apparatus according to claim 1 .

[0022] (1 6 ) A plurality of conveying rollers for gripping and conveying the cloth; A printing unit that prints on the cloth; The cloth is conveyed between a pair of conveying rollers disposed at positions opposite to each other with the printing unit therebetween. Weft Thread Count A fabric condition sensor for detecting the The printing unit and the cloth state sensor are Throughout the A scanning unit for scanning; A controller unit; A method for determining a conveyance amount of an image forming apparatus, comprising: The controller unit 、 before The fabric status is determined based on the detection data of the fabric status sensor. Weft Thread Count and calculating The fabric Weft Thread Count determining a next transport amount from the A method for determining a conveyance amount in an image forming apparatus that executes the above. Effect of the Invention

[0023] According to the present invention, in the image forming apparatus and the method for determining the transport amount for the image forming apparatus, it is possible to control the transport of the cloth by feeding back an appropriate correction value. [Brief description of the drawings]

[0024] [Figure 1] 1 is a schematic diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 13 is a top view showing the scanning of the carriage. [Figure 4] 11A and 11B are diagrams illustrating a state of the cloth detected by a cloth grain detection sensor. [Diagram 5] 11A and 11B are diagrams illustrating a state of the cloth detected by a cloth grain detection sensor. [Figure 6] This is an embossed rubber roller shown in the photograph substituted for a drawing. [Figure 7] This is the nap-raising roller shown in the photograph substituted for a drawing. [Figure 8] FIG. 13 is a diagram showing a roller arrangement for increasing the roller contact angle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] In order to solve the problem that the tension of the stretchable fabric cannot be controlled in the roll-to-roll conveying method, the inventor has detected the stretch state of the fabric at multiple points across the entire area in the width direction of the fabric, and corrected the conveyance amount of the fabric based on the detected state. Hereinafter, the embodiment for carrying out the present invention will be described in detail with reference to the drawings.

[0026] FIG. 1 is a schematic diagram showing the configuration of an image forming apparatus according to the present embodiment. The image forming apparatus 1 is configured with a correction controller 2, an interface 3, a transport unit 4, a scanning unit 5, and a carriage 6. These units are connected via a system bus, and various signals and data can be input and output between them. The image forming apparatus 1 is a scan-type printing device in which the carriage 6, which is a printing unit, moves in the cloth width direction to form (print) an image on the cloth, and transports the cloth intermittently.

[0027] The correction controller 2 includes a central processing unit (CPU) 21, a random access memory (RAM) 22, a read only memory (ROM) 23, and a storage unit 24.

[0028] The CPU 21 (an example of a calculation device) controls the operation of each part in the image forming apparatus 1 by executing a program read from the ROM 23 or the storage unit 24, and is also capable of performing predetermined processing based on signals, data, etc. acquired from each part. In the first embodiment, the CPU 21 of the correction controller 2 controls the operations of the conveying unit 4, the scanning unit 5, and the carriage 6. The correction controller 2 is a controller unit that determines the next conveying amount in intermittent conveying from a plurality of data collected by a fabric weave detection sensor 61, which will be described later.

[0029] The ROM 23 stores programs executed by the CPU 21, data used when the programs are executed, etc. The CPU 21 executes various processes related to the image forming apparatus 1 by reading and executing the programs stored in the ROM 23. In the RAM 22, variables and parameters generated during the arithmetic processing of the CPU 21 are temporarily written.

[0030] The storage unit 24 is a large-capacity storage device such as a hard disk drive or a solid state drive (SSD), and is used as a storage unit for storing various data related to the present embodiment. In addition to an operating system (OS) and various parameters, a printing program 241 and a correction control program 242 are recorded in the storage unit 24.

[0031] The printing program 241 is a program for causing the CPU 21 to control the scanning unit 5 to scan the inkjet head 62 and print on the fabric 7 based on input image data.

[0032] The correction control program 242 is a program for causing the CPU 21 to intermittently convey the cloth 7 by a predetermined amount based on the grain state of the cloth 7, and for correcting the conveyance amount of the conveying unit 4.

[0033] The ROM 23 and the storage unit 24 are non-volatile memories that record programs, data, and the like required for the operation of the CPU 21. The ROM 23 and the storage unit 24 are used as an example of a computer-readable non-transitory recording medium that stores a program executed by the computer constituting the correction controller 2.

[0034] The interface 3 is composed of a NIC (Network Interface Card), a modem, etc. The interface 3 is a communication unit that establishes a connection with each device, such as a printer controller and a personal computer (not shown), via a LAN (Local Area Network), and allows the correction controller 2 to transmit and receive various data.

[0035] The conveying unit 4 includes an upstream conveying motor 411 and a downstream conveying motor 412. The conveying unit 4 is a mechanism for conveying the cloth, and is controlled by the correction controller 2 described above. The upstream conveying motor 411 drives the upstream conveying roller 45a shown in FIG. 2. The downstream conveying motor 412 drives the downstream conveying roller 46 shown in FIG. 2. The upstream conveying motor 411 and the downstream conveying motor 412 are, for example, stepping motors, and the amount of rotation can be accurately controlled.

[0036] The scanning unit 5 is a mechanism for scanning the carriage 6 in the cloth width direction, and is controlled by the above-mentioned correction controller 2. The correction controller 2 causes the scanning unit 5 to scan the cloth grain detection sensor 61 in the cloth width direction, calculates the stretching state of the cloth 7 from the detection data of the cloth grain detection sensor 61, and determines the next transport amount from the stretching state of the cloth 7. The carriage 6 is a printing unit including an inkjet head 62 and equipped with a weft detection sensor 61, and is scanned in the cloth width direction by the scanning unit 5 to print on the cloth 7. The scanning unit 5 is a mechanical unit capable of moving the weft detection sensor 61 back and forth in the same direction as the movement of the carriage 6. The inkjet head 62 is a printing unit that forms an image by printing on the cloth. The weft detection sensor 61 is an optical sensor, and is a cloth state sensor that detects the stretch state of the cloth at multiple points in the cloth width direction between a pair of conveying rollers installed at positions facing each other across the inkjet head 62. The weft detection sensor 61 captures an image of the surface of the cloth 7, and the correction controller 2 counts the number of wefts from the surface image of the cloth 7. The current stretch state of the cloth relative to the standard state of the cloth can be detected based on the difference between the number of wefts detected by the weft detection sensor 61 and the standard number of wefts. The weft detection sensor 61 has a light source that irradiates infrared light onto the cloth, and the number of wefts is counted by processing the image of the infrared light. This makes it possible to stably detect the stretch state of the cloth regardless of the illuminance of the installation environment. That is, the fabric texture detection sensor 61 detects the tension between a pair of transport rollers disposed at opposing positions across the inkjet head 62. The correction controller 2 then determines the next transport amount of the fabric 7 from data of multiple locations detected by the fabric texture detection sensor 61. The correction controller 2 then controls the transport unit 4 so that the tension of the fabric 7 becomes a predetermined value based on the stretch state of the fabric 7 detected by the fabric texture detection sensor 61. The carriage 6 will be described in detail later with reference to FIGS.

[0037] FIG. 2 is a schematic diagram showing the transport path of the cloth 7. 2 shows the fabric head winder 401, dancer rollers 48 and 49, the decurler 91, guide rollers 44, 441, 442 and 443, the guide plate 47, the upstream transport roller 45a and the pinch roller 45b, the carriage 6, the downstream transport roller 46, the electric heater 92 and the fabric winder 402. Of these, the dancer rollers 48 and 49, the guide rollers 44, 441, 442 and 443, the upstream transport roller 45a and the pinch roller 45b and the downstream transport roller 46 transport the fabric 7 intermittently. Of these, the upstream transport roller 45a and the pinch roller 45b and the downstream transport roller 46 are a pair of transport rollers that grip the fabric 7 immediately before and immediately after the fabric grain detection sensor 61.

[0038] The fabric original roll 401 is an unprinted fabric roll. The decurler 91 is a straightening unit that straightens out curled fabric 7, for example by applying water to the fabric 7. The dancer rollers 48 and 49 are functional units that maintain the tension of the fabric 7 being conveyed at a predetermined value. The guide rollers 44, 441, 442, and 443 are driven rollers that guide the conveyance of the fabric 7, and are made of, for example, metal. The guide plate 47 is a metal plate that guides the conveyance of the fabric 7.

[0039] The upstream transport roller 45a and the downstream transport roller 46 are drive rollers that drive the transport of the cloth 7, and are provided with a grip structure described below to grip the cloth 7. The upstream transport roller 45a and the downstream transport roller 46 are a pair of transport rollers that are installed at positions facing each other with the printing unit therebetween. The pinch roller 45b is a driven roller facing the upstream conveying roller 45a, and nips the cloth 7 to reduce conveying errors due to slipping. The upstream conveying roller 45a is a roller provided on the downstream side immediately adjacent to the guide plate 47 and on the upstream side immediately adjacent to the carriage 6, and is driven by the upstream conveying motor 411 to convey the cloth 7.

[0040] The surface of the upstream transport roller 45a has a grip structure for gripping the cloth 7, and is processed, for example, to have a shark skin texture. The pinch roller 45b abuts against the cloth 7 being transported by the upstream transport roller 45a. The upstream transport roller 45a and the pinch roller 45b grip the cloth 7. The pinch roller 45b is biased toward the upstream conveying roller 45a by a pressure mechanism (not shown). This allows the upstream conveying roller 45a to grip the cloth 7 more firmly than the downstream conveying roller .

[0041] The downstream transport roller 46 is a roller provided immediately upstream of the carriage 6, and is driven by the downstream transport motor 412 to transport the cloth 7. The surface of the downstream transport roller 46 is processed, for example, into a shark skin to form a grip structure. Since the upstream transport roller 45a is provided on the upstream side of the inkjet head 62 and the downstream transport roller 46 is provided on the downstream side, the correction controller 2 can control the tension of the cloth 7 at the position where the inkjet head 62 prints. The downstream transport roller 46 grips the cloth 7 more weakly than the upstream transport roller 45a. As a result, when the tension of the cloth 7 becomes too high, the cloth 7 slides on the downstream transport roller 46, so that the tension of the cloth 7 can be kept below a predetermined value.

[0042] The carriage 6 is scanned in the cloth width direction by the scanning unit 5 in FIG. 5, includes an inkjet head 62, and is configured with a cloth grain detection sensor 61 attached on the upstream side. This allows the cloth grain detection sensor 61 to suitably detect the state of the upstream cloth 7 that has not yet been printed. The cloth grain detection sensor 61 may be attached on the downstream side of the inkjet head 62. The inkjet head 62 is scanned in the cloth width direction (main scanning direction) to form an image on the cloth 7. The cloth grain detection sensor 61 detects the state of the cloth 7 between a pair of upstream conveying rollers 45a and downstream conveying rollers 46 that are installed at positions facing each other with the inkjet head 62 in between, and is scanned in the cloth width direction by the scanning unit 5. The cloth grain detection sensor 61 detects the stretching state of the cloth 7 immediately before the inkjet head 62, which is the printing unit. This allows the CPU 21 to feed back an appropriate correction value and control the conveyance.

[0043] The electric heater 92 is a heater for drying the printed fabric 7. The fabric take-up 402 is a roll of printed fabric.

[0044] The fabric 7 is unwound from the fabric original roll 401 and passes through the guide roller 441 while a predetermined tension is applied by the dancer roller 48. Then, the fabric 7 has its curl corrected by the decurler 91, passes through the guide roller 44 and the guide plate 47, and is transported by the nip region between the upstream transport roller 45a and the pinch roller 45b. Then, the fabric 7 is printed by the inkjet head 62, passes through the downstream transport roller 46 and the guide roller 442, and is dried by the electric heater 92. The fabric 7 passes through the guide roller 443 and is taken up on the fabric take-up 402 with a predetermined tension by the dancer roller 49.

[0045] In the embodiment of FIG. 2, a pair of upstream transport rollers 45a and downstream transport rollers 46, which are installed on either side of the carriage 6, are each driven and controlled to hold the cloth 7 in a secure grip. The upstream transport rollers 45a and downstream transport rollers 46 have a grip structure that allows the cloth 7 to be properly gripped so that slippage does not occur. The cloth 7 in the section between the upstream transport rollers 45a and downstream transport rollers 46 is least susceptible to tension disturbances. A fabric texture detection sensor 61 that detects the state of the cloth 7 is provided in this section, and the correction controller 2 controls the transport amount based on the state of the cloth 7 detected by the fabric texture detection sensor 61. This makes it possible to minimize transport errors caused by the movement of the cloth 7 and obtain high-quality printing results.

[0046] In other words, the image forming apparatus 1 includes a fabric detection sensor 61 which is a means for detecting the tension of the fabric 7, a pair of upstream conveying rollers 45a and downstream conveying rollers 46 which perform conveying correction of the fabric 7 before and after the detection means, and a CPU 21 which determines the conveying amount (correction amount) from the detected tension of the fabric 7.

[0047] The fabric grain detection sensor 61 detects the state of the fabric 7 immediately before the printing unit (the carriage 6 mounting the inkjet head 62), and the CPU 21 feeds back this information to the transport amount of the fabric 7, thereby improving the correction accuracy.

[0048] Fig. 3 is a top view showing the scanning of the carriage 6. The horizontal direction in Fig. 3 is the cloth width direction. The cloth 7 is transported toward the upper side of the figure. The scanning unit 5 scans by reciprocating a carriage 6 in the lateral direction and cloth width direction in Fig. 3. A fabric grain detection sensor 61 is installed on the upstream side of the carriage 6 (lower side in the figure). As a result, while the inkjet head 62 reciprocates in the cloth width direction to print on the cloth 7, the fabric grain detection sensor 61 also moves reciprocally in the cloth width direction. The fabric grain detection sensor 61 detects the fabric grain state in a number of detection areas 613 across the entire width of the cloth 7 just before the inkjet head 62.

[0049] 4 and 5 are diagrams showing the state of the cloth 7 detected by the cloth grain detection sensor 61. FIG. Specifically, for example, Fig. 4 is an image captured when the cloth 7 is in a static state (when there is zero stretch), with the horizontal direction of the figure being the cloth width direction and the upward direction of the figure being the conveying direction, and Fig. 5 is an image captured when the cloth 7 is in a stretched state, with the horizontal direction of the figure being the cloth width direction and the upward direction of the figure being the conveying direction.

[0050] A detection area 613 is located at the center of the images in FIGS. 4 and 5, where weft yarns 71 are stretched in the width direction and warp yarns 72 are stretched in the vertical direction (conveyance direction). When the yarns are counted in the detection area 613 in FIG. 4, the number of weft yarns 71 is found to be three.

[0051] In contrast, Fig. 5 is an image captured when the cloth 7 is stretched. When the threads are counted in the detection area 613 in Fig. 5, the number of weft threads 71 ​​changes to two. By detecting this change, the CPU 21 in Fig. 1 quantifies the amount of stretch of the cloth 7. In this case, the amount of stretch of the cloth 7 is the amount of change from the standard number of weft threads divided by the standard number of weft threads, specifically 0.3333.... By performing this in multiple detection areas 613 across the cloth width, the CPU 21 collects sampling data across the entire width of the cloth 7.

[0052] The CPU 21 controls the conveyance by feeding back an appropriate conveyance amount based on the state of the cloth 7. In principle, the CPU 21 sets the conveyance amount of the downstream conveyance roller 46 to the printing width of the inkjet head 62, and sets the conveyance amount of the upstream conveyance roller 45a to the aforementioned printing width plus feedback of the stretch amount of the cloth 7 between the upstream conveyance roller 45a and the downstream conveyance roller 46. In the case of Fig. 5, the conveyance amount of the upstream conveyance roller 45 is calculated by subtracting the distance between the upstream conveyance roller 45a and the downstream conveyance roller 46 multiplied by the stretch amount of the cloth 7 and a feedback coefficient from the printing width of the inkjet head 62.

[0053] The portion of the cloth 7 that connects the previous print and the current print is in the vicinity of the downstream transport roller 46, so the transport amount of the downstream transport roller 46 is set to a predetermined value here. This makes it possible to connect the intermittent printed areas of the cloth 7 continuously.

[0054] FIG. 6 shows an embossed rubber roller in the form of a photograph substituted for a drawing. An embossed rubber band is attached to the surface of the roller in Fig. 6. By providing such a grip structure to the upstream transport roller 45a and the downstream transport roller 46, the cloth 7 can be securely gripped.

[0055] FIG. 7 shows a nap-raising roller in a photograph substituted for a drawing. A raised material with short fibers is wound around the surface of the roller in Fig. 6. By providing such a grip structure to the upstream transport roller 45a and the downstream transport roller 46, the cloth 7 can be gripped securely.

[0056] FIG. 8 is a diagram showing a roller arrangement for increasing the roller contact angle. By providing a guide roller 44 in the vicinity of (just before or just after) the upstream transport roller 45a and bending the transport path of the cloth 7 to increase the contact angle θ of the upstream transport roller 45a, the cloth 7 can be securely gripped.

[0057] In this embodiment, as a grip structure, a pinch roller 45b is biased against the upstream transport roller 45a to form a nip region, thereby reducing transport errors due to slippage. However, such a nip requires a pressure mechanism, which has the drawback of leaving pressure marks on the printing surface. However, the method shown in FIG. 8 does not require a pressure mechanism because the fabric 7 is gripped without a nip, and there is no risk of leaving pressure marks on the fabric 7.

[0058] According to the image forming apparatus 1 of this embodiment, the correction controller 2 can feed back an appropriate correction value to control the transport of the cloth.

[0059] (Modification) The present invention is not limited to the above-described embodiment, and modifications can be made without departing from the spirit of the present invention. For example, the following modifications are possible: (a) to (b).

[0060] (a) The grip structure for gripping the fabric is not limited to the embossed rubber roller alone, and may be combined with a method for increasing the contact angle by the roller arrangement shown in FIG. 8, and is not limited thereto. (b) The grip structure for gripping the fabric is not limited to the nap raising roller alone, and may be combined with a method for increasing the contact angle by the roller arrangement shown in FIG. 8, and is not limited thereto. [Explanation of symbols]

[0061] 1. Image forming device 2 Correction Controller 21 CPU 22 RAM 23 ROM 24 Memory section 241 Printing Program 242 Compensation Control Program 3. Interface 4. Conveyor 401 Cloth wrapping 402 Cloth winding 411 Upstream conveying motor 412 Downstream conveying motor 44,441~443 Guide roller 45a Upstream conveying roller 45b Pinch roller 46 Downstream conveying roller 47 Guide Plate 48,49 Dancer Lola 5 Scanning section 6 Carriage 61 Fabric detection sensor (Fabric condition sensor) 613 Detection Area 62 Inkjet head (printing section) 7. Fabric 71 Weft 72 Warp threads 91 Decala 92 Electric Wire Heater

Claims

1. A plurality of conveying rollers for gripping and conveying the cloth; A printing unit that prints on the cloth; a cloth state sensor for detecting the number of wefts of the cloth between a pair of conveying rollers disposed at positions opposite to each other with the printing unit therebetween; a scanning unit that scans the printing unit and the cloth condition sensor over the entire area in the cloth width direction; a controller unit that determines a next feed amount based on the stretch state of the cloth detected by the cloth state sensor; An image forming apparatus comprising:

2. A plurality of conveying rollers for gripping and conveying the cloth; A printing unit that prints on the cloth; a cloth condition sensor that detects a stretching state of the cloth between a pair of conveying rollers that are disposed at positions opposite to each other with the printing unit therebetween; a scanning unit that scans the printing unit and the cloth condition sensor over the entire area in the cloth width direction; a controller unit that determines a next feed amount based on the stretch state of the cloth detected by the cloth state sensor; a carriage on which the printing unit and the cloth condition sensor are mounted; An image forming apparatus comprising:

3. A plurality of conveying rollers for gripping and conveying the cloth; A printing unit that prints on the cloth; a cloth state sensor capable of counting the number of wefts of the cloth between a pair of conveying rollers disposed at positions opposite to each other with the printing unit therebetween; a scanning unit that scans the printing unit and the cloth condition sensor over the entire area in the cloth width direction; a controller unit that determines a next feed amount based on the stretch state of the cloth detected by the cloth state sensor; An image forming apparatus comprising:

4. A plurality of conveying rollers for gripping and conveying the cloth; A printing unit that prints on the cloth; a cloth state sensor that captures an image of the surface of the cloth between a pair of conveying rollers that are disposed at positions opposite to each other with the printing unit therebetween; a controller unit that counts the number of wefts of the cloth included in the captured image captured by the cloth condition sensor and determines a next conveyance amount based on the counted number of wefts; An image forming apparatus comprising:

5. The plurality of conveying rollers include downstream conveying rollers disposed on the downstream side and upstream conveying rollers disposed on the upstream side, The controller unit controls the downstream transport rollers to transport the cloth by the printing width of the printing unit, and controls the upstream transport rollers to transport the cloth by the counted number of wefts. The image forming apparatus according to claim 4 .

6. the cloth condition sensor detects tension on an upstream side of the printing unit in a conveying direction of the cloth. The image forming apparatus according to claim 1 .

7. The conveying roller has a grip structure for gripping the cloth. The image forming apparatus according to claim 1 .

8. A motor capable of controlling the rotation amount of the conveying roller is provided. The image forming apparatus according to claim 1 .

9. The cloth condition sensor detects the condition of the cloth at a plurality of points in the cloth width direction, the controller unit determines the amount of fabric to be fed based on data of a plurality of points detected by the fabric condition sensor. The image forming apparatus according to claim 1 .

10. The fabric condition sensor is provided upstream of the printing unit. The image forming apparatus according to claim 1 .

11. the cloth condition sensor detects the condition of the cloth between the upstream roller immediately adjacent to the printing unit and the printing unit; The image forming apparatus according to claim 1 .

12. The fabric condition sensor has a light source that illuminates the fabric. The image forming apparatus according to claim 1 .

13. a conveying mechanism for intermittently conveying the cloth by a pair of conveying rollers which grip the cloth immediately before and immediately after the cloth condition sensor; the controller unit controls the conveying mechanism so as to set the tension of the cloth to a predetermined value based on the stretch state of the cloth detected by the cloth state sensor. The image forming apparatus according to claim 1 .

14. The conveying roller has a grip structure for gripping the cloth. The image forming apparatus according to claim 13.

15. A stepping motor capable of controlling the rotation amount of the conveying roller is provided. The image forming apparatus according to claim 13.

16. A plurality of conveying rollers for gripping and conveying the cloth; A printing unit that prints on the cloth; a cloth state sensor for detecting the number of wefts of the cloth between a pair of conveying rollers disposed at positions opposite to each other with the printing unit therebetween; a scanning unit that scans the printing unit and the cloth condition sensor over the entire area in the cloth width direction; A controller unit; A method for determining a conveyance amount of an image forming apparatus, comprising: The controller unit Calculating the number of wefts of the fabric from the detection data of the fabric condition sensor; determining a next conveyance amount from the number of wefts of the cloth; A method for determining a conveyance amount in an image forming apparatus that executes the above.

Images