JP4821337B2 - Inkjet recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording device which can appropriately control a release position of cloth from an endless belt according to the difference in degree of stretching of the cloth. <P>SOLUTION: This inkjet recording device comprises the endless belt 24 which is tensely hooked across a plurality of rotators and supports/conveys the cloth 12, a lead-in means 10 which leads in the cloth 12 onto the endless belt 24, a recording means 20 which records data by discharging ink to the cloth 12 on the endless belt 24, and a release means 30 which releases the data-recorded cloth 12 from the surface of the endless belt 24. The release means 30 can change the release position of the cloth 12 from the surface of the endless belt 24, according to the degree of stretching of the cloth 12. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to an ink jet recording apparatus, and more specifically, in a case where a fabric is conveyed and supported using an endless belt, the peeling position from the endless belt can be appropriately controlled according to the difference in the degree of stretch of the fabric, The present invention relates to an ink jet recording apparatus capable of always performing high quality recording.

  In an inkjet recording apparatus that records an image by ejecting fine droplets of ink from a nozzle of a recording head onto a cloth, an endless belt stretched around a plurality of rotating bodies is used to smooth the cloth in the recording area. Used to convey and support the fabric.

  FIG. 13 shows a fabric transport mechanism of such an ink jet recording apparatus. In the figure, 100 is a fabric, 101, 102 and 103 are rollers, 104 is an endless belt stretched over these rollers 101 to 103, and 105 is a recording head.

  The endless belt 104 is driven when the roller 102 is rotated by a motor (not shown), and the cloth 100 is adhered to the flat surface between the rollers 101 and 102 by an adhesive force to support its conveyance.

  In order to keep the surface of the fabric 100 during recording by the recording head 105 smooth, a constant tension is applied to the fabric 100 fed to the endless belt 104. The fabric 100 is in close contact with the endless belt 104 with this tension applied, and an image is recorded by the recording head 105 disposed above the rollers 101 and 102.

  The fabric 100 after recording is further conveyed downstream by the endless belt 104, and is eventually taken up by a take-up roller (not shown) and peeled off from the endless belt 104.

By the way, the fabric 100 shows a difference in the degree of elongation depending on the difference in the fabric or weaving. In an ink jet recording apparatus, an image must be recorded using various fabrics 100 having different degrees of expansion.
Japanese Patent Laid-Open No. 6-1023 (Points where a certain tension is applied to the ink sheet) Japanese Patent Laid-Open No. 6-183086 (Points where winding torque is changed according to the type of recording paper) Japanese Patent No. 3697895 (point of making winding tension weaker than tension in printing)

  In an ink jet recording apparatus using such an endless belt 104, in order to reduce the size of the apparatus, generally, a measure for shortening the distance L between the rollers 101 and 102 is often taken. Along with this, the distance from the recording position by the recording head 105 to the roller 102 on the downstream side also becomes shorter. For this reason, the fabric 100 after recording is separated from the endless belt 104 at an early stage after leaving the recording head 105 from below.

  However, when the fabric 100 is of a type having a high degree of extension, the fabric 100 on the endless belt 104 is in a state of being stretched under a certain tension. If it peels off from the endless belt 104 at an early stage before reaching the belt 102, the adhesive area of the fabric 100 with respect to the endless belt 104 becomes smaller, so that before the recording on the endless belt 104 and the adhesive force of the endless belt 104, As a result of the force of the fabric 100 during recording being shrunk, the fabric 100 is peeled off from the endless belt 104 and the surface state is changed, which causes image quality deterioration.

  For this reason, it is conceivable that the adhesive force of the endless belt 104 is increased to make the fabric 100 difficult to contract. However, increasing the adhesive force not only increases the cost, but also cleans the endless belt 104 for cleaning. There arises a problem that the roller for use is deteriorated severely or the fabric 100 is deteriorated.

  On the other hand, when the fabric 100 is of a type having a small degree of elongation, the distance from the central axis O of the roller 102 to the endless belt 104 as shown in FIG. 14 when the fabric 100 reaches the roller 102 on the downstream side. And the distance to the fabric 100, there is a difference between the amount of movement of the outer periphery of the roller 102 and the amount of movement of the fabric 100, and the amount of movement of the fabric 100 is larger, so that wrinkles 104a are generated in the endless belt 104. Therefore, there is a problem that the fabric 100 cannot be normally conveyed. For this reason, it is necessary to peel the fabric 100 from the endless belt 104 at a relatively early stage before reaching the roller 102.

  As described above, when trying to reduce the size of the apparatus, it is difficult to perform high-quality image recording unless the separation position from the endless belt is appropriately controlled in accordance with the difference in the stretch degree of the fabric. Come.

  Therefore, the present invention provides an ink jet recording apparatus that can appropriately control the peeling position from the endless belt in accordance with the difference in the stretch degree of the fabric and can always perform high quality recording. Let it be an issue.

  The other subject of this invention becomes clear by the following description.

  The above problems are solved by the following inventions.

  According to the first aspect of the present invention, there is provided an endless belt that is stretched over a plurality of rotating bodies, supports and conveys the cloth, feed means for feeding the cloth onto the endless belt, and the cloth on the endless belt. An ink jet recording apparatus comprising: a recording unit that discharges ink to perform recording; and a peeling unit that peels off the recorded fabric from the endless belt, wherein the peeling unit includes a degree of expansion of the fabric. Accordingly, the position of the peeling from the endless belt can be changed.

  According to a second aspect of the present invention, there is provided tension applying means for applying tension to the fabric fed to the endless belt, and the peeling means is in accordance with the degree of expansion of the fabric when the tension is applied by the tension applying means. 2. The ink jet recording apparatus according to claim 1, wherein a peeling position from the endless belt is changed.

  According to a third aspect of the invention, there is provided the ink jet recording apparatus according to the first or second aspect, further comprising an extension degree detecting means for detecting an extension degree of the fabric.

  A fourth aspect of the present invention is the ink jet recording apparatus according to the third aspect, wherein the extension degree detecting means has a plurality of extension degree detection sensors provided side by side in the vertical direction.

  A fifth aspect of the present invention is the ink jet recording apparatus according to the third aspect, wherein the extension degree detecting means has one extension degree detection sensor that is movable up and down.

  According to a sixth aspect of the present invention, there is provided a slack forming means for forming a slack in the fabric after being peeled from the endless belt, and a slack state detecting means for detecting a slack state of the fabric formed by the slack forming means. The peeling means controls the peel position from the endless belt according to the slack state of the fabric detected by the slack state detecting means. Inkjet recording apparatus.

  A seventh aspect of the present invention is the ink jet recording apparatus according to the sixth aspect, wherein the slack state detecting means has a plurality of slackness detecting sensors provided side by side in the vertical direction.

  The invention according to claim 8 is the ink jet recording apparatus according to claim 6, wherein the slackness state detecting means has one slackness detection sensor movable up and down.

  A ninth aspect of the present invention is the ink jet recording apparatus according to any one of the first to eighth aspects, wherein a surface of the endless belt has adhesiveness.

  A tenth aspect of the present invention is the ink jet recording according to any one of the first to ninth aspects, further comprising an electrostatic force generating means for generating an electrostatic attraction force for attracting the fabric to the endless belt. Device.

  According to the first aspect of the present invention, the peeling position from the endless belt can be appropriately controlled according to the difference in the degree of stretch of the fabric, and high-quality recording can always be performed.

  According to the second aspect of the present invention, since the degree of stretch of the fabric can be determined using means for applying a predetermined tension to the fabric, it is necessary to add a separate stretching mechanism or the like in order to measure the stretch of the fabric. Absent.

  According to the third aspect of the present invention, the stretch degree of the fabric can be easily detected, and the separation position of the fabric from the endless belt can be changed based on the detected stretch degree.

  According to the fourth aspect of the present invention, the stretch degree of the fabric can be easily detected by the plurality of stretch degree detection sensors, and the separation position of the fabric from the endless belt is determined based on the detected stretch degree. Can be changed.

  According to the fifth aspect of the present invention, it is possible to reduce the number of use of the extension degree detection sensor and to detect the extension degree more finely.

  According to the sixth aspect of the present invention, the slack state of the fabric can be easily detected, and the separation position of the fabric from the endless belt can be determined based on the detected slack state.

  According to the seventh aspect of the present invention, the slack state of the fabric can be easily detected by the plurality of slack detection sensors, and the separation position of the fabric from the endless belt is determined based on the detected slack state. can do.

  According to the eighth aspect of the invention, the number of detection sensors used can be reduced, and the peeling position of the fabric can be changed more finely by detecting the stretch / sag state more finely.

  According to the ninth aspect of the present invention, the fabric can be brought into close contact with the surface of the endless belt, and can be stably conveyed and supported.

  According to the invention described in claim 10, it is not necessary to make the adhesive force on the endless belt surface so strong that the fabric can be adsorbed on the endless belt by using the electrostatic adsorption force.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an outline of an ink jet recording apparatus according to the present invention, and FIG. 2 is a block diagram showing a structure of a main part of the ink jet recording apparatus according to the present invention.

  In FIG. 1, 10 is a cloth feeding mechanism section, 20 is a recording mechanism section, and 30 is a cloth peeling mechanism section.

  An original winding 12a is attached to the original winding roller 11 in the fabric feeding mechanism section 10, and the fabric 12 is fed out from the original winding 12a. The original winding roller 11 can be rotated by an original winding motor 41 (see FIG. 2), and the rotation of the fabric 12 is controlled by the controller 40 (see FIG. 2). The fabric 12 fed out from the original winding 12 a is fed into the recording mechanism unit 20 via the relay rollers 13 and 14.

  Between the relay rollers 13 and 14, a tension applying unit 15 that applies a predetermined tension to the fabric 12 is provided. The fabric 12 is fed into the recording mechanism unit 20 with a predetermined tension applied by the tension applying unit 15.

  The configuration of the tension applying unit 15 is not particularly limited as long as a predetermined tension can be applied to the fabric 12 before being fed into the recording mechanism unit 20. Here, a weight member having a predetermined weight, for example, a paper tube 15a, is placed on the fabric 12 between the relay rollers 13 and 14. Since the paper tube 15a rolls on the fabric 12 in accordance with the conveyance of the fabric 12, the paper tube 15a is fixed to the fabric 12 at a predetermined position between the relay rollers 13 and 14 simply by placing the paper tube 15a on the fabric 12. This is preferable because it can be applied with a tension of. The strength of the tension can be adjusted by the weight of the paper tube 15a.

  In addition, the tension applying unit 15 may be configured to use a rotating body such as a tension roller urged downward with a predetermined force by, for example, a tension spring.

  The fabric 12 to which a predetermined tension is applied by the tension applying unit 15 is stretched with a stretch degree corresponding to the type. Accordingly, the conveyance path of the fabric 12 between the relay rollers 13 and 14 is lowered downward to a position corresponding to the degree of expansion of the fabric 12, as shown in FIG.

  Here, the degree of stretching in the present invention includes not only a quantitative degree of stretching of the fabric 12 but also a qualitative degree of stretching (stretched state).

  In the vicinity of the tension applying unit 15, a plurality of extension degree detection sensors 16 a to 16 c are arranged side by side in the vertical direction. These stretch degree detection sensors 16a to 16c detect the lower end position of the fabric 12 that has been lowered to a position corresponding to the stretch degree when a predetermined tension is applied by the tension applying unit 15, and thereby the degree of stretch of the fabric 12 is detected. The extension degree detection unit 16 for detecting the above is configured.

  Here, the extension degree detection unit 16 has three extension degree detection sensors 16a to 16c. However, if the extension degree detection unit 16 can detect a plurality of different positions of the fabric 12, the number of arrangement and the specific configuration are particularly limited. It doesn't matter.

  As shown in FIG. 3, the first extension degree detection sensor 16a located at the uppermost position uses the position indicated by the broken line A as the detection line, and the second extension degree detection sensor 16b located intermediately uses the position indicated by the broken line B as the detection line. The third extension degree detection sensor 16c located at the lowermost position uses the position indicated by the broken line C as a detection line.

  Detection signals from the extension degree detection sensors 16a to 16c are transmitted to the controller 40 (see FIG. 2). The controller 40 detects the lower end position of the fabric 12 by determining the presence / absence of detection signals from the extension degree detection sensors 16a to 16c, and determines the extension degree.

  FIG. 4 shows the relationship between the detection signals of the extension degree detection sensors 16a to 16c and the extension degree of the fabric 12. As shown in FIG. According to this, when the extension degree of the fabric 12 is in the state of the solid line in FIG. 3, the first extension degree detection sensor 16a is “detected”, but the second extension degree detection sensor 16b and the third extension degree are detected. Since the detection sensor 16c is “not detected”, the degree of expansion is “small”. In addition, when the degree of expansion of the fabric 12 is in the state of the one-dot chain line in FIG. 3, the first extension degree detection sensor 16a and the second extension degree detection sensor 16b are “detected”, but the third extension degree detection sensor. Since 16c is “no detection”, the degree of expansion is “medium”. Further, when the stretch degree of the fabric 12 is in the state of the two-dot chain line in FIG. 3, all of the first stretch degree detection sensor 16a, the second stretch degree detection sensor 16b, and the third stretch degree detection sensor 16c are “detected”. Therefore, the degree of expansion is “large”.

  In the controller 40, the correspondence relationship between the detection signals of the extension degree detection sensors 16a to 16c and the extension degree of the fabric 12 is stored in advance as, for example, a table, and the detection signals of the extension degree detection sensors 16a to 16c are stored. The degree of expansion of the fabric 12 is determined according to the presence or absence.

  Note that the degree of expansion of the fabric 12 may be a plurality of stages, and is not limited to the above three stages.

  The recording mechanism unit 20 is provided with a fabric transport mechanism in which an endless belt 24 is stretched over three rollers (rotators) 21, 22, and 23. Among them, the driving roller 22 is driven to rotate at a predetermined speed in the direction of the arrow in response to the driving force of the transport motor 43 (see FIG. 2) controlled by the controller 40 (see FIG. 2).

  The surface of the endless belt 24 increases the friction with the fabric 12 to enable conveyance thereof, and the fabric 12 is brought into close contact with the surface to make the recording surface smooth, and the recorded fabric 12 is made to be the endless belt 24. It has a predetermined adhesiveness that can be easily peeled from above. Therefore, the cloth 12 that has been fed in a state where a predetermined tension is applied from the cloth feeding mechanism section 10 is brought into close contact with the surface of the endless belt 24 by the pressing roller 25 disposed above the driven roller 21, It can be stably conveyed and supported.

  Such adhesiveness can be imparted by providing an adhesive material on the surface of the endless belt 24. As the adhesive material, for example, a silicon resin or a urethane resin can be used.

  The fabric 12 on the endless belt 24 is in close contact with the endless belt 24 in a stretched state to which a predetermined tension is applied, and is conveyed along with its driving.

  A recording head 26 is disposed above an endless belt 24 that is substantially horizontal between the driven roller 21 and the driving roller 22. The recording head 26 ejects ink of a predetermined color corresponding to image data onto the surface of the fabric 12 that has been conveyed in close contact with the endless belt 24. The image data is transmitted from the host computer and stored in the buffer memory 45 as shown in FIG. 2, and a data signal for driving is transmitted to the recording head driver 44 based on a command from the controller 40. The recording head driver 44 drives the recording head 26 based on this data signal.

  The recording head 26 includes a short shuttle head that records an image while reciprocating in the width direction orthogonal to the conveyance direction of the fabric 12, and a long shape that spans the width direction of the fabric 12. There is a line type head that is formed and records in the width direction of the fabric 12 at a time. In the case of the shuttle type head, the fabric 12 is intermittently conveyed by a predetermined distance, and in the case of the line type head, the fabric 12 is continuously conveyed at a constant speed.

  The recorded fabric 12 on which a desired image is recorded by the recording head 26 is sent from the endless belt 24 to the peeling mechanism unit 30.

  A cleaning roller 27 is disposed below the lowermost driven roller 23 so as to be in contact with the surface of the endless belt 24. The cleaning roller 27 is immersed in the cleaning liquid 28, and the surface of the rotationally driven endless belt 24 is cleaned with the cleaning liquid 28.

  The recorded fabric 12 fed to the peeling mechanism unit 30 is taken up by the take-up roller 32 via the slack forming roller 31. The winding roller 32 can be rotated by a winding motor 42 (see FIG. 2), and the winding of the fabric 12 is controlled by the controller 40 (see FIG. 2).

  The fabric 12 sent out from the endless belt 24 to the rear portion 30 of the peeling machine is controlled to be wound by the winding roller 32, so that the fabric 12 hangs down between the endless belt 24 and the slack forming roller 31. 12, a slack portion 12b is formed.

  In the vicinity of the slack forming roller 31, a plurality of slack detection sensors 33a to 33c are arranged in the vertical direction. These slack detection sensors 33a to 33c constitute a slack state detection unit 33 for detecting the slack state of the fabric 12 by detecting the lower end position of the slack portion 12b of the fabric 12.

  Here, the slack state detection unit 33 includes three slack detection sensors 33a to 33c. If the slack state detection unit 33 can detect a plurality of different slack states from the lower end position of the slack portion 12b of the fabric 12, the arrangement thereof is provided. The number and specific configuration are not particularly limited.

  As shown in FIG. 5, the first slack detection sensor 33a located at the uppermost position has a position indicated by a broken line A as a detection line, and the second slackness detection sensor 33b located in the middle has a position indicated by a broken line B as a detection line. The third slack detection sensor 33c located at the lowermost position has a position indicated by a broken line C as a detection line.

  Detection signals of these slack detection sensors 33a to 33c are transmitted to the controller 40 (see FIG. 2). The controller 40 detects the lower end position of the slack portion 12b of the fabric 12 by determining the presence or absence of detection signals from the slack detection sensors 33a to 33c, and determines the slack state.

  The relationship between the detection signals of the slack detection sensors 33a to 33c and the slack state of the fabric 12 is shown in FIG. According to this, when the slack portion 12b of the fabric 12 is in the state of the solid line in FIG. 5, all the slack detection sensors 33a to 33c are “not detected”, and thus are determined as “sagging state 1”. Further, when the slack portion 12b of the fabric 12 is in the state of the one-dot chain line in FIG. 5, the first slackness detection sensor 33a is “detected”, but the second slackness detection sensor 33b and the third slackness detection sensor 33c. Is “no detection”, and is determined to be “sagging state 2”. Furthermore, when the slack portion 12b of the fabric 12 is in the state of the two-dot chain line in FIG. 5, the first slackness detection sensor 33a and the second slackness detection sensor 33b are “detected”, but the third slackness detection sensor. Since 33c becomes “no detection”, it is determined as “sagging state 3”.

  In the controller 40, the correspondence relationship between the detection signals of the slack detection sensors 33a to 33c and the slack state of the fabric 12 is stored in advance as a table, for example, according to the presence or absence of the detection signals of the slack detection sensors 33a to 33c. The slack state of the fabric 12 is determined.

  Here, the slack state of the fabric 12 has three levels corresponding to the detection of the extension degree of the fabric 12, but may be a plurality of levels and is not limited at all.

  When the winding roller 32 winds the fabric 12 by a predetermined amount, the fabric 12 is peeled from the endless belt 24 at a position corresponding to the slack state.

  That is, as shown in FIG. 5, when the slack state of the fabric 12 is a solid line state (slack state 1), the fabric 12 extends from above the endless belt 24 at the position E1 on the central axis of the drive roller 22. It is peeled off. When the slack state of the fabric 12 is a one-dot chain line state (slack state 2), the fabric 12 is peeled off from the endless belt 24 at a position E2 slightly along the arc surface of the drive roller 22. Furthermore, when the slack state of the fabric 12 is a two-dot chain line state (slack state 3), the fabric 12 is peeled off from the endless belt 24 at the position E3 along the arc surface of the drive roller 22 about 1/4. Is done.

  Therefore, for example, when the fabric 12 is to be peeled off at the position E1, the winding roller 32 is rotated until the slack state 1 is detected when the slack detection sensors 33a to 33c detect that the fabric 12 is in the slack state 2. Thus, a predetermined amount of the fabric 12 may be wound up.

  In the controller 40, for example, as shown in FIG. 7, data that optimizes the correspondence between the degree of expansion of the fabric 12 and the slack state (peeling position) is stored in advance as a table or the like. Based on this correspondence, the controller 40 detects signals from the slack detection sensors 33a to 33c so as to peel the fabric 12 at an optimum peeling position corresponding to the stretch degree of the fabric 12 detected by the stretch degree detection sensors 16a to 16c. The slack state of the fabric 12 is detected.

  For example, when it is detected that the extension degree of the fabric 12 is “small”, the optimal peeling position of the fabric 12 is the position E1, and the slack state of the fabric 12 becomes the “slack state 1” state. In other words, from FIG. 6, the drive of the winding motor 42 is controlled to wind up a predetermined amount of the fabric 12 around the winding roller 32 so that all the slack detection sensors 33 a to 33 c are “no detection signal”. .

  Although not shown, a drying mechanism for drying the recording fabric 12 fed from the endless belt 24 may be provided between the recording mechanism 20 and the winding roller 32.

  Next, the operation of the ink jet recording apparatus will be described.

  First, after the original winding 12a is mounted at a predetermined position, the original winding roller 11 is set in a free state, the fabric 12 is pulled out and fixed between the pressing roller 25 and the endless belt 24 via the relay rollers 13 and 14. To do. Thereafter, the original winding roller 11 is locked.

  In this state, no tension is applied to the fabric 12 between the relay rollers 13 and 14, but when a paper tube 15 a is placed on the fabric 12 and a predetermined tension is applied to the fabric 12, the tension depends on the type of the fabric 12. The fabric 12 is stretched in the vertical direction, and the position of the paper tube 15a is lowered. At this time, the extension degree of the fabric 12 is detected by the extension degree detection sensors 16 a to 16 c of the extension degree detection unit 16.

 Here, it is assumed that the stretch degree of the fabric 12 is in the state of the solid line in FIG. Therefore, the controller 40 determines that the extension degree of the fabric 12 is “small”. At this time, from FIG. 7, the controller 40 should control the take-up roller 32 so that the optimum peeling position of the fabric 12 is the position E1, and the fabric 12 is in the “slack state 1” state. Is determined.

  Thereafter, an image is recorded on the fabric 12 on the endless belt 24 by the recording head 26, and when the recorded fabric 12 is fed from the endless belt 24 to the peeling mechanism unit 30, it is formed between the slack forming rollers 31. By detecting the lower end position of the loosened portion 12b by the slackness detection sensors 33a to 33c of the slackness degree detecting portion 33, the fabric 12 is controlled while controlling the winding roller 32 so that the fabric 12 is in the “sagging state 1”. By winding up, the fabric 12 is peeled off from the endless belt 24 at a position E1 which is an optimum peeling position.

  If it is determined that the stretch degree of the fabric 12 is “medium”, the fabric 12 is similarly peeled off from the endless belt 24 at the position E2 which is the optimum peel position, and the stretch degree of the fabric 12 is determined. Is determined to be “large”, similarly, the fabric 12 is peeled off from the endless belt 24 at the position E3 which is the optimum peeling position.

  As described above, according to the present invention, the peeling position from the endless belt 24 can be changed according to the stretch degree of the fabric 12 to be used, so that the optimum peel position according to the stretch degree of the fabric 12 can be obtained. Can be peeled off. Therefore, even if the stretch degree of the fabric 12 used varies, the state of the fabric 12 before and during recording on the endless belt 24 can be kept constant, so that high quality recording can always be performed. it can.

  FIG. 8 shows another aspect of the extension degree detection unit 16.

  The extension degree detection unit 16 has one extension degree detection sensor 160. The extension degree detection sensor 160 is attached to a wire 162 spanned between pulleys 161 and 161 arranged at intervals in the vertical direction, and the pulley 161 is rotated by a motor (not shown) in the vertical direction. It is configured to be movable. The height position of the extension detection sensor 160 in the vertical direction can be detected by providing, for example, an encoder sensor for detecting the number of steps of the stepping motor that rotates the pulley 161 and the position of the extension detection sensor 160. it can.

  Therefore, according to the stretch detection unit 16, the stretch detection sensor 160 is moved up and down and the sensor position at the time when the detection signal changes is detected, so that the lower end position of the fabric 12, that is, the fabric 12 is detected. The degree of extension can be detected. According to this, the number of detection sensors used can be reduced, and the degree of expansion can be detected more finely.

  FIG. 9 shows another mode of the slack state detection unit 33.

  The slack state detection unit 33 has one slack detection sensor 330. The slack detection sensor 330 is attached to a wire 332 that is stretched between pulleys 331 and 331 that are spaced apart in the vertical direction, and moves in the vertical direction when the pulley 331 is rotated by a motor (not shown). It is configured to be possible. The height position of the slack detection sensor 330 in the vertical direction can be detected by providing, for example, the number of steps of a stepping motor that rotates the pulley 331, an encoder sensor for detecting the position of the slack detection sensor 330, or the like.

  Therefore, according to the slack state detection unit 33, the slack state of the fabric 12 can be detected by moving the slack detection sensor 330 to a predetermined height according to the degree of expansion of the fabric 12. According to this, the number of detection sensors used can be reduced, and a slack state corresponding to the fine extension degree of the fabric 12 can be formed.

  In the above description, the extension degree of the fabric 12 is detected by the extension degree in the tension applying unit 15 that applies a predetermined tension to the cloth 12. According to this, it is preferable because it is not necessary to add a stretching mechanism part for stretching the fabric 12 separately in order to measure the stretch degree of the fabric 12, but the present invention is not limited to this, and the stretch degree of the fabric 12 is increased. You may provide the expansion mechanism part etc. for measuring separately.

  In the above description, the stretch degree of the fabric 12 is automatically detected using the detection sensor. However, the operator may visually determine the stretch degree of the fabric 12 in the tension applying unit 15 or the like.

  FIG. 10 shows an example of the extension degree detection unit 16 that is preferable in such a case. This extension degree detection unit 16 is divided into three areas 1601 to 1603 of extension degrees “small”, “medium”, and “large” according to the position of the paper tube 15a erected at the end between the relay rollers 13 and 14. The color discrimination plate 1600 is color-coded. Accordingly, the operator can visually determine the color of the visual discriminating plate 1600 where the paper tube 15a is located, whereby the degree of expansion of the fabric 12 can be discriminated.

  In this case, an expansion degree input setting unit is provided on the operation panel of the apparatus, and the expansion degree visually confirmed by the operator is input, so that the controller 40 can input the fabric 12 based on the data shown in FIGS. What is necessary is just to determine the optimal peeling position.

  Further, when the stretch degree is known in advance depending on the type of the fabric 12 to be used, the operator does not perform an operation for detecting the stretch degree of the fabric 12 in the tension applying unit 15 or the like, and the operator sets the stretch in the input setting unit as described above. You may make it input a degree directly. In this case, the extension degree detection unit 16 is not necessarily provided.

  FIG. 11 shows another aspect of the fabric transport mechanism.

  In this embodiment, an electrostatic force generator 29 that generates an electrostatic adsorption force that attracts the fabric 12 to the endless belt 24 is provided on the back side of the endless belt 24 that is positioned between the driven roller 21 and the drive roller 22. ing.

  The electrostatic force generator 29 has a plurality of counter electrodes in which negative electrodes and positive electrodes (not shown) are alternately arranged in a comb shape, and an endless belt is applied by applying a DC voltage to the counter electrodes. 24 is charged, and the fabric 12 is attracted onto the endless belt 24 by electrostatic attraction force.

From the viewpoint of preventing deflection of the ink ejected from the recording head 26, it is preferable that the electrostatic attraction force generated by the electrostatic force generator 29 be 0.7 N / 100 cm ² or less.

In this case, as shown in FIG. 12, the endless belt 24 has an electrostatic force holding layer 24b capable of holding an electrostatic force between a base material 24a made of glass cloth or the like and a surface adhesive layer 24c. Preferably it is. From the viewpoint of allowing the endless belt 24 to hold the electrostatic force and favorably adsorb the fabric 12, the electrostatic force holding layer 24b has a volume resistivity of 10 ³ Ωcm or more, such as Teflon (registered trademark). It is preferable to be formed of a material.

  According to such a fabric transport mechanism, the fabric 12 can be adsorbed on the endless belt 24 by using the electrostatic attraction force generated by the electrostatic force generator 29, so that the adhesive force on the surface of the endless belt 24 is not so much. You don't have to be strong. Therefore, for example, even if wrinkles of the fabric 12 occur on the endless belt 24, the position of the fabric 12 can be easily corrected and dealt with. Moreover, deterioration of the fabric 12 is also suppressed.

1 is a configuration diagram showing an outline of an ink jet recording apparatus according to the present invention. 1 is a block diagram showing a configuration of a main part of an ink jet recording apparatus according to the present invention. Configuration diagram showing the tensioning section The figure which shows the relationship between the detection signal of an extension degree detection sensor, and the extension degree of a fabric. Configuration diagram showing a slack state detection unit The figure which shows the relationship between the detection signal of a slack detection sensor, and the slack state of a fabric. The figure which shows a response | compatibility with the expansion degree of a fabric, and a slack state (peeling position). The figure which shows another aspect of an expansion degree detection part The figure which shows another aspect of a slack state detection part The figure which shows another aspect of an expansion | extension degree detection part. The block diagram which shows another aspect of a fabric conveyance mechanism Diagram showing layer structure of endless belt Configuration diagram showing a conventional fabric transport mechanism The figure explaining the state of the endless belt when peeling the conventional fabric

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Feeding-in mechanism part 11: Original winding roller 12: Fabric 12a: Original winding 12b: Slack part 13, 14: Relay roller 15: Tension applying part 15a: Paper tube 16: Extension degree detection part 16a: First extension degree detection sensor 16b: Second extension degree detection sensor 16c: Third extension degree detection sensor 160: Extension degree detection sensor 161: Pulley 162: Wire 1600: Visual discriminating plates 1601-1603: Area 20: Recording mechanism section 21, 23: Driven roller 22: Drive roller 24: Endless belt 24a: Base material 24b: Electrostatic force holding layer 24c: Adhesive layer 25: Pressing roller 26: Recording head 27: Cleaning roller 28: Cleaning liquid 29: Electrostatic force generator 30: Peeling mechanism unit 31: Slack forming roller 32: Winding roller 33: Slack state detection unit 33a: First slack detection sensor 33b : Second slack detection sensor 33c: third slack detection sensor 330: slack detection sensor 331: pulley 332: wire 40: controller 41: original winding motor 42: winding motor 43: transport motor 44: recording head driver 45: buffer memory

Claims (10)

An endless belt that is stretched over a plurality of rotating bodies and supports and conveys the fabric;
Feeding means for feeding the fabric onto the endless belt;
Recording means for performing recording by discharging ink to the fabric on the endless belt;
An ink jet recording apparatus comprising a peeling means for peeling the recorded fabric from the endless belt,
The ink-jet recording apparatus according to claim 1, wherein the peeling means is capable of changing a peeling position from the endless belt according to the degree of elongation of the fabric. Having tension applying means for applying tension to the fabric fed to the endless belt;
2. The ink jet recording apparatus according to claim 1, wherein the peeling unit changes a peeling position from the endless belt according to a degree of stretch of the fabric when the tension is applied by the tension applying unit.   3. An ink jet recording apparatus according to claim 1, further comprising an extension degree detecting means for detecting an extension degree of the fabric.   4. The ink jet recording apparatus according to claim 3, wherein the extension degree detection means includes a plurality of extension degree detection sensors provided side by side in the vertical direction.   4. An ink jet recording apparatus according to claim 3, wherein said extension degree detecting means has one extension degree detection sensor that can move up and down. Slack forming means for forming a slack in the fabric after being peeled from the endless belt;
A slack state detecting means for detecting a slack state of the fabric formed by the slack forming means,
The ink jet recording apparatus according to claim 1, wherein the peeling unit controls a peeling position from the endless belt according to a slack state of the fabric detected by the slack state detecting unit. .   7. The ink jet recording apparatus according to claim 6, wherein the slack state detecting means includes a plurality of slack detecting sensors provided side by side in the vertical direction.   7. The ink jet recording apparatus according to claim 6, wherein the slack state detecting means has one slack detecting sensor that can move up and down.   The ink jet recording apparatus according to claim 1, wherein a surface of the endless belt has adhesiveness. The ink jet recording apparatus according to claim 1, further comprising an electrostatic force generating unit that generates an electrostatic attraction force that attracts the fabric to the endless belt.

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