JP2007307786A - Printer, conveyor, and printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly secure a medium without generating wrinkles in a printer. <P>SOLUTION: The printer has a table 110 for securing the medium 30 sent out from a medium roller 20 by sucking the same, a guide roller 106, a printing section 112, and a suction control section 114, the guide roller 106 is held in a position separated above from a suction face and the suction control section 114 further controls the position of the guide roller 106 in the case the medium 30 is conveyed, the suction control section 114 puts the medium 30 on the suction face in order from the side far from the guide roller 106 by gradually bring the guide roller 106 closer to the table 110 in the case of causing the table 110 to carry out suction movement, the suction control section 114 releases the medium 30 from the suction face in order from the side near from the guide roller 106 by gradually releasing the guide roller 106 from the table 110 in the case of causing the table 110 to carry out release movement. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a printing apparatus, a conveying apparatus, and a printing method.

  2. Description of the Related Art Conventionally, as a printing apparatus that performs printing on a thin medium such as a film, an ink jet printer that uses a medium wound up in a roll shape is known (see, for example, Non-Patent Document 1). In such a printing apparatus, it is necessary to fix the medium before printing.

  As a method of fixing the medium, for example, a method of pressing both ends of the printing range with guide rollers that guide the conveyance of the medium is conceivable. However, with this method, there is a case where wrinkles are generated in the medium and an accurate printing result cannot be obtained. In order to suppress the generation of wrinkles, for example, it is conceivable to increase the number of guide rollers to control the tension applied to the medium. However, increasing the number of guide rollers is not preferable because the system becomes complicated.

  Conventionally, printing apparatuses that fix a medium by suction are known (for example, see Patent Documents 1 to 4). However, even in this case, wrinkles may occur due to the suction operation with respect to a thin medium such as a film. Therefore, in this case as well, there are cases where an accurate print result cannot be obtained.

Thus, conventionally, it has been difficult to appropriately fix the medium without generating wrinkles. For this reason, the medium is wrinkled, and an accurate print result may not be obtained. SUMMARY An advantage of some aspects of the invention is that it provides a printing apparatus, a conveyance apparatus, and a printing method that can solve the above-described problems.
Internet (URL: http://www.mimaki.co.jp/) JP 2002-137359 A JP 2001-328233 A JP-A-11-198345 Japanese Patent Laid-Open No. 11-5293

In order to solve the above problems, the present invention has the following configuration.
(Configuration 1) A printing apparatus using a medium roll in which a medium is wound in a roll shape, a table for fixing the medium fed from the medium roll by suction, a guide roller for guiding the conveyance of the medium, and a table The guide roller includes a printing unit that performs printing on the adsorbed medium, an adsorption operation that adsorbs the medium, and an adsorption control unit that causes the table to perform a release operation that releases the medium from the adsorption. The guide roller is perpendicular to the adsorption surface of the table. When the medium is transported, it is held at a position spaced upward from the suction surface, and the suction control unit further controls the position of the guide roller to perform the suction operation on the table. In this case, the suction control unit places the media on the suction surface in order from the side farther from the guide roller by gradually bringing the guide roller closer to the table in the vertical movement direction. When to perform the release operation table, the suction control section, by separating gradually guide rollers in the vertical movement direction from the table, in order from the side close to the guide rollers, releasing the medium from the suction surface. For example, after the conveyance of the medium is temporarily stopped, the suction control unit gradually brings the guide roller closer to the table.

  According to this configuration, when the medium is fixed to the table by suction, the medium is gradually attracted to the table from the side far from the guide roller as the guide roller gradually descends toward the table. In this case, for example, the wrinkle is less likely to occur in the medium as compared with the case where the whole is adsorbed at once. Therefore, if comprised in this way, adsorption | suction of a medium can be performed reliably and easily. Furthermore, this makes it possible to obtain an accurate printing result in printing by the printing unit after suction.

  When the medium is released from the suction after printing or the like, the medium is gradually released from the side closer to the guide roller as the guide roller is gradually separated from the table. Thereby, the medium can be easily released from the adsorbed state. During this time, the table stops suction or blows out, for example.

  Here, the guide roller need not be movable in a direction strictly perpendicular to the suction surface, but may be moved in a direction including a component in the vertical movement direction. For example, the guide roller may move in the vertical movement direction while moving in a direction parallel to the suction surface.

  (Configuration 2) The table is a suction surface member that constitutes the suction surface, and has a suction surface member that has air permeability over the entire surface, and a plurality of exhaust chambers that are arranged in the medium transport direction and can be independently evacuated. And a suction unit that sucks the medium through the suction surface member as each exhaust chamber is exhausted. Exhaust starts in order from the exhaust chamber far from the roller. For example, the suction control unit starts exhausting in order from the exhaust chamber far from the guide roller in accordance with the timing when the medium is placed on the suction surface.

  When configured in this manner, the adsorption surface of the table is divided into a plurality of areas in which suction can be individually controlled corresponding to the separation of the exhaust chambers. And when making a table perform adsorption operation, for example, the adsorption area of a table increases gradually from the side far from a guide roller. In this case, for example, the medium can be stretched before the medium is adsorbed to each adsorption area. Therefore, wrinkles are less likely to occur on the medium.

  Here, when the release operation is performed on the table, the suction control unit stops the exhaust sequentially from the exhaust chamber close to the guide roller, for example, in accordance with the timing at which the medium moves away from the suction surface. In this case, the suction area of the table gradually decreases according to the timing at which the medium moves away from the suction surface. Further, the suction control unit may cause the blowout in order from the exhaust chamber close to the guide roller in accordance with the timing at which the medium moves away from the suction surface. In this case, the blowing area of the table gradually increases according to the timing at which the medium moves away from the suction surface. If comprised in this way, a medium can be appropriately released from a suction surface, without generating a new wrinkle at the time of release.

  Note that the adsorption surface member having air permeability over the entire surface is not limited to the case where there is air permeability in all the minute areas of the surface, but within the range necessary for adsorbing the medium. It only has to be breathable. For example, the adsorption surface member may be formed by providing a large number of through holes (intake holes) in a non-breathable plate-like body.

  (Configuration 3) The table is an adsorption surface member that constitutes an adsorption surface, and is formed with an adsorption surface member having air permeability over the entire surface and at least three exhaust chambers arranged in a transverse direction across the medium. A suction portion for sucking the medium through the suction surface member as each exhaust chamber is exhausted, and each exhaust chamber has an orifice for restricting the flow rate of the exhausted gas. Of the at least three exhaust chambers, the orifice inlet opening for exhausting the central exhaust chamber is larger than the orifice inlet opening for exhausting at least two other exhaust chambers .

  When configured in this manner, the degree of vacuum with which the table sucks the medium is higher in the central portion in the transverse direction than in the left and right portions. In this case, the central portion of the medium is attracted to the table before the left and right portions. Therefore, with this configuration, it is possible to control the order of the medium adsorption and fixation with a simple configuration. This also makes it more difficult for the medium to be wrinkled.

  Each exhaust chamber is exhausted by, for example, a common pump. In this case, the degree of vacuum in each exhaust chamber after the medium covers the entire table is the same. Therefore, the degree of vacuum after adsorption of the entire medium can be made the same in the central portion and the left and right portions.

  (Configuration 4) The adsorption surface of the table is formed of Japanese paper. If comprised in this way, favorable air permeability can be exhibited over the whole adsorption | suction surface. Therefore, the medium can be appropriately adsorbed on the entire adsorption surface. For example, Japanese paper is held with its front surface (smooth surface) having a higher smoothness than the back surface facing the medium.

  (Configuration 5) A printing apparatus that performs printing by transporting a medium, and has a suction surface formed of Japanese paper, a table that fixes the medium transported on the suction surface by suction, and is sucked by the table A printing unit for printing on the printed medium. If comprised in this way, favorable air permeability can be exhibited over the whole adsorption | suction surface. Therefore, the adsorption surface of the table can be formed appropriately. Japanese paper is held with its surface (smooth surface) having a higher smoothness than the back surface facing the medium.

  (Configuration 6) A transport device for transporting a medium in a printing apparatus using a medium roll in which the medium is wound into a roll, and a table for fixing the medium fed from the medium roll by suction, and a guide for the transport of the medium And a suction control unit that causes the table to perform a suction operation for sucking the medium and a release operation for releasing the medium from the suction. The guide roller moves up and down in a vertical movement direction perpendicular to the suction surface of the table. When the medium is transported, it is held at a position spaced upward from the suction surface, and the suction control unit further controls the position of the guide roller to perform the suction operation on the table. In order to move the guide roller closer to the table in the vertical movement direction, place the media on the suction surface in order from the side far from the guide roller and release it to the table. When to perform the work, the suction control section, by separating gradually guide rollers in the vertical movement direction from the table, in order from the side close to the guide rollers, releasing the medium from the suction surface. If comprised in this way, the effect similar to the structure 1 can be acquired.

  (Configuration 7) A transport device that transports a medium in a printing apparatus that transports a medium and has a suction surface formed of Japanese paper, and fixes the medium transported on the suction surface by suction. Provide a table. If comprised in this way, the effect similar to the structure 5 can be acquired.

  (Configuration 8) A printing method using a medium roll in which a medium is wound up in a roll shape, and capable of moving up and down in a vertical movement direction perpendicular to a suction surface of a table that fixes the medium fed from the medium roll by suction. The guide roller is held at a position spaced upward from the adsorption surface of the table, the medium is conveyed while being guided by the guide roller, and the guide roller is gradually brought closer to the table in the vertical movement direction, so that the side far from the guide roller In order, place the medium on the suction surface, fix the medium on the table by suction, print on the medium sucked on the table, and gradually move the guide roller away from the table in the vertical movement direction. In order from the closest side, the medium is separated from the suction surface to release the medium from the suction. In this way, the same effect as in Configuration 1 can be obtained.

  (Configuration 9) A printing method in which a medium is transported to perform printing, and the medium transported on the suction surface is fixed to the table having the suction surface made of Japanese paper by suction, and is sucked to the table Print on the media. In this way, the same effect as in configuration 5 can be obtained.

  According to the present invention, it is possible to appropriately fix a medium without generating wrinkles in a printing apparatus.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. 1 and 2 show an example of the configuration of a printing apparatus 10 according to an embodiment of the present invention. FIG. 1 shows the printing apparatus 10 that is transporting a medium 30. FIG. 2 shows the printing apparatus 10 during printing on the medium 30. The printing apparatus 10 is an ink jet printing apparatus that uses a medium roll 20 in which a medium 30 such as a thin film or paper is wound in a roll shape, and includes a printing unit 112 and a transport unit 100. The printing unit 112 is an inkjet head, and performs printing on the medium 30 conveyed from the medium roll 20 by the conveyance unit 100.

  The transport unit 100 is a transport device for transporting the medium 30 and transports the medium 30 while repeating transport and transport stop. In this example, the conveyance unit 100 includes a conveyance control unit 116, motors 120 and 122, a feeding roller 102 with a motor shaft with a torque limiter, a table 110, a guide roller 104, and a guide roller that also serves as a driving roller (guide roller and driving roller). 106, a winding roller 108 with a motor shaft with a torque limiter, and an adsorption control unit 114. The conveyance control unit 116 controls the conveyance of the medium 30 by controlling the rotation of the feeding roller 102 and the take-up roller 108 via the motors 120 and 122. The motor 120 is a motor with a torque limiter on the feeding side. The motor 122 is a motor with a torque limiter on the winding side.

  The feeding roller 102 is a roller that holds the medium roll 20 before printing, and rotatably holds the medium roll 20 so that the medium 30 is sequentially fed out from the medium roll 20 according to the force with which the medium 30 is pulled out. Further, the feeding roller 102 pulls the medium 30 in the direction opposite to the direction in which the medium 30 is fed in accordance with an instruction from the conveyance control unit 116 by the driving force of the motor 120. Thereby, the feeding roller 102 adjusts the tension applied to the medium 30.

  The table 110 is a suction fixing stage that supports the lower surface of the medium 30 to be conveyed, and is provided so as to face the printing unit 112 with the medium 30 interposed therebetween. The table 110 fixes the medium 30 by suction by sucking the medium 30 in accordance with an instruction from the suction control unit 114 before printing. In addition, after printing is performed, the table 110 performs blowing instead of suction in accordance with an instruction from the suction control unit 114. As a result, the table 110 floats and releases the medium 30.

  The guide rollers 104 and 106 are rollers for guiding the conveyance of the medium 30. The guide rollers 104 and 106 are driven rollers that rotate in accordance with the movement of the medium 30 to be conveyed, and are provided at positions that sandwich the table 110 downstream of the feeding roller 102 in the conveyance direction of the medium 30.

  Here, in this example, the guide roller 104 on the upstream side in the transport direction of the table 110 has the same height as the uppermost portion and the suction surface of the table 110 so that the height of the medium 30 to be fed matches the suction surface of the table 110. It is held in the position where it becomes. Accordingly, when the table 110 sucks the medium 30, the position where the medium 30 is separated from the guide roller 104 on the downstream side in the transport direction is the height of the suction surface of the table 110.

  Further, the guide roller 106 on the downstream side of the conveying direction of the table 110 is a guide roller / driving roller, and is held so as to be vertically movable in the vertical movement direction perpendicular to the suction surface of the table 110 as indicated by an arrow 152. . As shown in FIG. 1, when the medium 30 is transported, the guide roller 106 is held at a position spaced upward from the suction surface. Accordingly, the guide roller 106 conveys the medium 30 while being separated from the table 110.

  As shown in FIG. 2, when printing on the medium 30, the guide roller 106 is held at a position where the uppermost part and the suction surface of the table 110 are at the same height, like the guide roller 104. The As a result, the guide roller 106 brings the medium 30 into contact with the suction surface of the table 110.

  The take-up roller 108 is a roller that takes up the medium 30 printed by the printing unit 112, and is provided downstream in the transport direction with respect to the guide roller 106. The take-up roller 108 rotates in the direction of taking up the medium 30 according to the instruction of the conveyance control unit 116 by the driving force of the motor 122. As a result, the take-up roller 108 sequentially feeds the medium 30 from the medium roll 20 held by the feed roller 102 and transports it in the transport direction.

  The suction control unit 114 causes the table 110 to perform a suction operation and a release operation by controlling suction and blowing of the table 110. Further, the suction control unit 114 further controls the position of the guide roller 106 according to the operation to be performed by the table 110.

  For example, when causing the table 110 to perform a suction operation, the suction control unit 114 gradually brings the guide roller 106 closer to the table 110 while causing the table 110 to perform suction. Accordingly, the suction control unit 114 places the medium 30 on the suction surface in order from the side far from the guide roller 106. In this case, as the guide roller 106 of the table 110 gradually approaches, the medium 30 is gradually attracted to the table 110 from the side far from the guide roller 106. Therefore, according to the present example, the medium 30 can be reliably and easily adsorbed without causing wrinkles in the medium 30.

  When causing the table 110 to perform the release operation, the suction control unit 114 raises the guide roller 106 while gradually blowing the table 110 instead of suction, and gradually separates the guide roller 106 from the table 110. Accordingly, the suction control unit 114 separates the medium 30 from the suction surface in order from the side closer to the guide roller 106. In this case, as the guide roller 106 gradually moves away from the table 110, the medium 30 is gradually released from the side closer to the guide roller 106. Therefore, according to this example, the medium 30 can be easily released from the attracted state.

  Here, the suction control unit 114 causes the table 110 to perform a suction operation before printing on the medium 30 is performed. The printing unit 112 performs printing on the medium 30 adsorbed on the table 110. Therefore, according to this example, an accurate printing result can be obtained in printing by the printing unit 112 after suction. For example, the suction control unit 114 causes the table 110 to perform a releasing operation before the conveyance of the medium 30 is resumed after printing. Thereby, the medium 30 can be appropriately transported in a state released from the suction fixed state.

  In addition, after the table 110 adsorbs the medium 30, it is preferable that the conveyance control unit 116 increases the tension applied to the medium 30 by controlling the feeding roller 102 and the take-up roller 108, for example. In this way, the medium 30 is pulled after being adsorbed, and for example, even if wrinkles occur during adsorption, the wrinkles can be removed appropriately.

  Hereinafter, the configuration of the table 110 will be described in more detail. FIG. 3 is an exploded perspective view showing a first example of the configuration of the table 110. The table 110 includes a suction surface member 202 and a suction unit 204. The adsorption surface member 202 is a porous plate having air permeability over the entire surface, and constitutes an adsorption surface of the table 110. In this example, the attracting surface member 202 is an etched metal plate having no residual stress. The shape of the suction surface member 202 is, for example, a rectangle having a side of about 500 to 600 mm. Further, through holes (intake holes) having a diameter of, for example, about 0.4 ± 0.1 mm are formed in the suction surface member 202 in an array at intervals of, for example, 1.5 mm. If comprised in this way, the medium 30 can be appropriately adsorbed by the whole adsorption surface.

  Here, as the adsorption surface member 202, for example, a resin porous member, Japanese paper, or the like can be used. Also in these cases, the medium 30 can be appropriately adsorbed by the entire adsorption surface. When Japanese paper is used as the suction surface member 202, for example, the Japanese paper is held with the surface having a high smoothness (smooth surface) facing the medium.

  The suction part 204 is a pedestal part having an exhaust chamber 302 whose upper part facing the suction surface member 202 is open. The suction unit 204 holds the suction surface member 202 so as to cover the opening of the exhaust chamber 302, thereby sucking the medium 30 through the suction surface member 202 as the exhaust chamber 302 is exhausted. The exhaust chamber 302 is connected to the intake port 402 of the orifice 304 for reducing the flow rate of the exhausted gas, and is exhausted through the orifice 304. The orifice 304 is connected to a pump (not shown) through a valve, for example, and exhausts the exhaust chamber 302 in accordance with an instruction from the adsorption control unit 114 (see FIG. 1). Thereby, the table 110 performs an adsorption operation. Further, when the table 110 performs the releasing operation, the orifice 304 sends air into the exhaust chamber 302 in accordance with an instruction from the adsorption control unit 114. As a result, the table 110 performs a balloon and releases the medium 30.

  In this example, the suction unit 204 has one exhaust chamber 302. The exhaust chamber 302 is connected to the intake port 402 of the orifice 304 at the center of the bottom surface. In the exhaust chamber 302, a wind direction control wall 306 for controlling the flow of air exhausted and sent by the orifice 304 is provided. The air direction control wall 306 is provided so as to surround the air inlet 402, thereby reducing variations in the degree of vacuum in the exhaust chamber 302.

  FIG. 4 is an exploded perspective view showing a second example of the configuration of the table 110. Except for the points described below, in FIG. 4, the same or similar components as those in FIG. 3 are denoted by the same reference numerals as those in FIG.

  In this example, the suction unit 204 includes a plurality of exhaust chambers 302 arranged in the transport direction of the medium 30. Each exhaust chamber 302 is partitioned by a partition wall 308. Further, each exhaust chamber 302 is connected to an intake port 402 of an orifice 304 provided for each exhaust chamber 302 at the center of the bottom surface thereof. The orifice 304 connected to each exhaust chamber 302 is connected to a pump (not shown) via, for example, an independently controllable valve. Therefore, each exhaust chamber 302 can be exhausted independently. In this example, each exhaust chamber 302 has a shape that is long in the transverse direction across the medium 30, and a wind direction control wall 306 for controlling the air flow is traversed in each exhaust chamber 302. It is provided so as to sandwich the air inlet 402 in the direction.

  With the above configuration, the suction unit 204 of the present example sucks the medium 30 through the suction surface member 202 as each exhaust chamber 302 is exhausted. Thus, the suction surface of the table 110 is divided into a plurality of suction areas that can individually control suction, corresponding to the separation of the exhaust chambers 302. Therefore, it is possible to control the suction area in which the medium 30 is sucked only to a specific area on the suction surface of the table 110.

  When the suction operation is performed on such a table 110, the suction control unit 114 of this example adjusts the exhaust chamber 302 far from the guide roller 106 (see FIG. 1) in accordance with the timing when the medium 30 is placed on the suction surface. The exhaust is started in order. In this way, the suction area of the table 110 can be gradually increased in accordance with the timing when the medium 30 is placed on the suction surface. This also makes it difficult for the medium 30 to be wrinkled.

  When causing the table 110 to perform the release operation, the suction control unit 114 causes the blowout in order from the exhaust chamber 302 close to the guide roller 106, for example, in accordance with the timing at which the medium 30 moves away from the suction surface. In this case, the suction area of the table 110 gradually decreases according to the timing at which the medium 30 moves away from the suction surface. Therefore, with this configuration, the medium 30 can be appropriately released from the suction surface without generating a new wrinkle at the time of release.

  5 and 6 show a third example of the configuration of the table 110. FIG. FIG. 5 is a perspective view showing the configuration of the suction unit 204 in this example. FIG. 6 is a perspective view showing the configuration of the orifices 304a to 304c used in this example. Except for the points described below, in FIG. 5 and FIG. 6, the same or similar components as those in FIG.

  In this example, the suction part 204 is formed with three exhaust chambers 302a to 302c arranged in a transverse direction across the medium, and the suction surface member is responsive to the exhaust of the respective exhaust chambers 302a to 302c. The medium is aspirated through 202. The exhaust chambers 302a to 302c are connected to the intake ports 402a to 402c of the orifices 304a to 304c, and are exhausted through the orifices 304a to 304c. In this example, two orifices 304a to 304c are connected to each of the exhaust chambers 302a to 302c. In each exhaust chamber 302a-c, a wind direction control wall 306 is provided between the two orifices 304a-c.

  Of the three exhaust chambers 302a to 302c, the opening of the intake port 402b of the orifice 304b for exhausting the central exhaust chamber 302b is the orifice 304a, c for exhausting the other two exhaust chambers 302a, c. It is larger than the openings of the intake ports 402a and 402c. Therefore, when the table 110 performs the suction operation, the degree of vacuum for sucking the medium 30 is higher in the central portion where the exhaust chamber 302b is formed than in the left and right portions where the exhaust chambers 302a and c are formed. In this case, the central portion of the medium 30 is attracted to the table 110 before the left and right portions. Therefore, according to this example, wrinkles are less likely to occur in the medium 30.

  All the orifices 304a to 304c are connected to a common pump, and exhaust the exhaust chambers 302a to 302c at the same time. In this case, the degree of vacuum in each of the exhaust chambers 302a to 302c after the medium 30 covers the entire table 110 is the same. Therefore, the degree of vacuum after the entire adsorption of the medium 30 can be made the same in the central portion and the left and right portions.

  FIG. 7 is an exploded perspective view showing a fourth example of the configuration of the table 110. Except for the points described below, in FIG. 7, the same or similar components as those in FIGS. 5 and 6 are denoted by the same reference numerals as those in FIGS.

  In this example, the suction part 204 has a plurality of exhaust chambers 302a to 302c formed in an array. In this arrangement, three exhaust chambers 302a to 302c are formed side by side in the transverse direction of the medium 30 as in the table 110 described with reference to FIGS. Therefore, in this example as well, for example, as in the case of the table 110 described with reference to FIGS. 5 and 6, when performing the suction operation, the center portion of the medium 30 is suctioned to the table 110 before the left and right portions. Can do.

  Further, the exhaust chambers 302a to 302c are formed side by side in the transport direction of the medium 30 as in the table 110 described with reference to FIG. Therefore, in this example as well, for example, as in the table 110 described with reference to FIG. 4, it is possible to control the suction area in which the medium 30 is sucked only to a specific area on the suction surface of the table 110. In addition, for example, the suction area of the table 110 can be gradually increased in accordance with the timing when the medium 30 is placed on the suction surface. Therefore, according to this example, the generation of wrinkles in the medium 30 can be further appropriately suppressed.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The present invention can be suitably used for a printing apparatus, for example.

1 is a diagram illustrating a printing apparatus 10 that is conveying a medium 30. FIG. 2 is a diagram illustrating the printing apparatus 10 during printing on a medium 30. FIG. 3 is an exploded perspective view showing a first example of a configuration of a table 110. FIG. It is a disassembled perspective view which shows the 2nd example of a structure of the table 110. FIG. It is a perspective view which shows the structure of the suction part 204 in the 3rd example of a structure of the table 110. FIG. It is a perspective view which shows the structure of the orifices 304a-c used in the 3rd example of a structure of the table 110. FIG. It is a disassembled perspective view which shows the 4th example of a structure of the table 110. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Printing apparatus, 20 ... Medium roll, 30 ... Medium, 40 ... Wrinkle, 100 ... Conveying part, 102 ... Feeding roller, 104 ... Guide roller, 106 ... Guide roller, 108 ... take-up roller, 110 ... table, 112 ... printing unit, 114 ... adsorption control unit, 116 ... transport control unit, 120 ... motor, 122 ...・ Motor, 152... Arrow, 202... Suction surface member, 204... Suction unit, 302... Exhaust chamber, 304 ... Orifice, 306 ... Air direction control wall, 308. Wall, 402 ... Inlet

Claims (9)

A printing apparatus using a medium roll in which a medium is wound into a roll,
A table for fixing the medium fed from the medium roll by suction;
A guide roller for guiding the conveyance of the medium;
A printing unit for printing on the medium adsorbed on the table;
An adsorption control unit for causing the table to perform an adsorption operation for adsorbing the medium and a release operation for releasing the medium from the adsorption;
The guide roller is vertically movable in a vertical movement direction perpendicular to the suction surface of the table, and when the medium is transported, is held at a position spaced upward from the suction surface,
The suction controller further controls the position of the guide roller;
In the case of causing the table to perform the suction operation, the suction control unit gradually moves the guide roller closer to the table in the up-and-down movement direction, thereby sequentially moving the medium to the suction surface from the side farther from the guide roller. On the
When causing the table to perform the releasing operation, the suction control unit gradually removes the guide roller from the table in the up-and-down movement direction, thereby sequentially removing the medium from the side closer to the guide roller. A printing apparatus characterized by being separated from the printing apparatus. The table is
An adsorption surface member constituting the adsorption surface, the adsorption surface member having air permeability over the entire surface,
A plurality of exhaust chambers that can be independently evacuated are formed in the medium conveyance direction, and suction is performed to suck the medium through the suction surface member as each of the exhaust chambers is exhausted. And
The printing apparatus according to claim 1, wherein when the suction operation is performed by the table, the suction control unit starts exhausting in order from the exhaust chamber far from the guide roller. The table is
An adsorption surface member constituting the adsorption surface, the adsorption surface member having air permeability over the entire surface,
At least three exhaust chambers arranged in a transverse direction across the medium are formed, and each of the exhaust chambers has a suction portion that sucks the medium through the suction surface member in accordance with the exhaust. And
Each of the exhaust chambers is exhausted through an orifice for restricting the flow rate of the exhausted gas,
Of the at least three exhaust chambers, the opening of the inlet of the orifice for exhausting the central exhaust chamber is more than the opening of the inlet of the orifice for exhausting at least two other exhaust chambers The printing apparatus according to claim 1, wherein the printing apparatus is large.   The printing apparatus according to claim 1, wherein the suction surface of the table is formed of Japanese paper. A printing apparatus that performs printing by transporting a medium,
A table having a suction surface formed of Japanese paper and fixing the medium conveyed on the suction surface by suction;
A printing apparatus comprising: a printing unit that performs printing on the medium adsorbed on the table. A transport device for transporting the medium in a printing apparatus using a medium roll in which the medium is wound into a roll,
A table for fixing the medium fed from the medium roll by suction;
A guide roller for guiding the conveyance of the medium;
An adsorption control unit for causing the table to perform an adsorption operation for adsorbing the medium and a release operation for releasing the medium from the adsorption;
The guide roller is vertically movable in a vertical movement direction perpendicular to the suction surface of the table, and when the medium is transported, is held at a position spaced upward from the suction surface,
The suction controller further controls the position of the guide roller;
In the case of causing the table to perform the suction operation, the suction control unit gradually moves the guide roller closer to the table in the up-and-down movement direction, thereby sequentially moving the medium to the suction surface from the side farther from the guide roller. On the
When causing the table to perform the releasing operation, the suction control unit gradually removes the guide roller from the table in the up-and-down movement direction, thereby sequentially removing the medium from the side closer to the guide roller. A conveying device characterized by being separated from the carrier. A transport device that transports the medium in a printing device that transports the medium to perform printing,
A transport apparatus comprising a suction surface formed of Japanese paper, and a table for fixing the medium transported on the suction surface by suction. A printing method using a medium roll in which the medium is wound into a roll,
Holding a guide roller that can move up and down in the vertical movement direction perpendicular to the suction surface of the table that fixes the medium fed from the medium roll by suction at a position spaced upward from the suction surface of the table,
The medium is conveyed while being guided by the guide roller,
By gradually approaching the guide roller to the table in the vertical movement direction, the medium is placed on the suction surface in order from the side far from the guide roller, and the medium is fixed to the table by suction,
Printing on the medium adsorbed on the table;
Printing is characterized in that, by gradually separating the guide roller from the table in the vertical movement direction, the medium is separated from the suction surface in order from the side closer to the guide roller to release the medium from suction. Method. A printing method for transporting a medium and performing printing,
The medium conveyed on the suction surface is fixed by suction to a table having a suction surface made of Japanese paper,
A printing method comprising printing on the medium adsorbed on the table.

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