JP5814058B2 - Printing apparatus and printing system - Google Patents

Description

  The present invention relates to a printing apparatus and a printing system, and more particularly to a technique for conveying continuous paper.

  Conventionally, as this type of apparatus, there is a printing apparatus including a driving roller, a tension detection unit, a control unit, and a printing unit. The drive roller feeds continuous paper. The tension detector detects the tension of the continuous paper. The control unit varies the rotation speed of the drive roller based on the detection result of the tension detection unit. The printing unit prints on continuous paper (see, for example, Patent Documents 1 and 2).

  For example, in Patent Document 1, the printing unit includes a rotary printing machine, and performs printing in a state where the rotary printing machine is in contact with continuous paper. A single drive roller is provided on the upstream side of the printing unit. When the control unit controls the driving roller, an appropriate tension is applied to the continuous paper between the printing unit (rotary printing press) and the driving roller. As a result, the continuous paper is conveyed in a properly stretched state.

  Patent Document 2 discloses a so-called printing system including two printing units and a reversing unit between these printing units. The printing unit is an inkjet method, and prints on continuous paper in a non-contact state. One drive roller is arranged on the upstream side and the downstream side of each printing unit. The control unit adjusts the rotation speed of these drive rollers, whereby an appropriate tension is applied to the continuous paper between adjacent drive rollers.

JP 2002-60104 A JP 2007-69455 A

However, the conventional example having such a configuration has the following problems.
That is, an external device such as an unwinding device or a coating device is provided on the upstream side of the printing device or the printing paper system. The external device may give a disturbance to the continuous paper. When continuous paper is disturbed, the tension and speed of the continuous paper fluctuate. In this specification, fluctuations in tension and speed of continuous paper are referred to as “continuous paper fluctuations” as appropriate. Although the fluctuation of the continuous paper is weakened before and after the driving roller, it is difficult to sufficiently prevent the fluctuation of the continuous paper with only a single driving roller. For this reason, the fluctuation of the continuous paper is transmitted to the continuous paper on the downstream side of the drive roller, and the continuous paper is conveyed to the printing unit in a changed state.

  However, when the printing unit is in contact with continuous paper as in Patent Document 1, there is not much problem even if the continuous paper fluctuates. This is because the printing unit itself holds (nips) the continuous paper and suppresses the fluctuation of the continuous paper. Therefore, even if the continuous paper is subjected to disturbance, the continuous paper on which the printing unit performs printing is in a state in which fluctuation is suppressed.

  On the other hand, when the printing unit does not contact the continuous paper as in Patent Document 2, the continuous paper passes through the printing unit while changing. That is, the continuous paper on which the printing unit performs printing is in a fluctuating state. For this reason, there arises a disadvantage that it is difficult to print appropriately.

  The present invention has been made in view of such circumstances, and even when the continuous paper is subjected to disturbance, the continuous paper is applied to a printing unit that performs printing in a non-contact state with the continuous paper. It is an object of the present invention to provide a printing apparatus and a printing system that can be appropriately conveyed.

In order to achieve such an object, the present invention has the following configuration.
That is, the printing apparatus of the present invention is a printing apparatus, provided on one of the upstream side or the downstream side of the printing unit that prints on continuous paper in a non-contact state with continuous paper, A drive shaft driving roller, provided on the other upstream or downstream side of the printing unit, provided on the upstream side of the first drive roller for conveying continuous paper, the drive shaft for the base shaft and the first drive roller; A second drive roller that conveys continuous paper, a first detection unit that is provided between the base shaft drive roller and the first drive roller and detects the tension of the continuous paper, the base shaft drive roller, and the first drive roller And a second detection unit that is provided on the downstream side of the second drive roller and detects the tension of the continuous paper, and the rotational speed of the first drive roller based on the detection result of the first detection unit And the second And a control unit for varying the rotation speed of the second drive roller based on a detection result of the detection section, wherein, the tension of the continuous paper detected by the second detector is the first detection unit In the printing apparatus, the first driving roller and the second driving roller are controlled so as to be higher than the tension of the continuous paper detected by .

  [Operation / Effect] According to the printing apparatus of the present invention, the base shaft driving roller, the first driving roller, and the second driving roller respectively convey continuous paper from the upstream side to the downstream side. The printing unit prints on the continuous paper without contact with the conveyed continuous paper.

  At least two drive rollers are provided on the upstream side of the printing unit. The two driving rollers are one of the base shaft driving roller and the first driving roller and the second driving roller. These two drive rollers can sufficiently reduce fluctuations in continuous paper.

  Here, a conveyance section defined by two drive rollers provided on the upstream side of the printing unit is referred to as an “upstream conveyance section”, and a conveyance section defined by the base drive roller and the first drive roller is referred to as “printing conveyance”. This is called “interval”.

  The first detection unit detects the tension of the continuous paper in the printing conveyance section, and the second detection unit detects the tension of the continuous paper in the upstream conveyance section. The control unit varies the rotation speed of the first drive roller based on the detection result of the first detection unit, and adjusts the tension of the continuous paper in the printing conveyance section. Further, the control unit varies the rotation speed of the second drive roller based on the detection result of the second detection unit, and adjusts the tension of the continuous paper in the upstream conveyance section. Thereby, the fluctuation | variation of continuous paper can be suppressed further.

  As described above, the variation of the continuous paper can be suitably suppressed by the arrangement of the driving roller and the control by the control unit. Therefore, even when the continuous paper is disturbed on the upstream side of the second drive roller (that is, upstream of the upstream conveyance section), the continuous paper can be appropriately conveyed to the printing unit. . That is, although the printing unit does not contact the continuous paper, the continuous paper on which the printing unit performs printing is kept in a state in which fluctuation is suppressed. Therefore, the printing unit can appropriately print continuous paper.

In the present invention, the control unit may be configured such that the tension of the continuous paper detected by the second detection unit is higher than the tension of the continuous paper detected by the first detection unit. The roller and the second driving roller are controlled. In other words, the control unit performs control so that the tension of the continuous paper is greater in the upstream conveyance section than in the printing conveyance section. According to this, it is possible to further prevent the fluctuation of the continuous paper from being transmitted from the upstream conveyance section to the printing conveyance section.

  In the above-described invention, the third drive roller that is provided on the downstream side of the base shaft drive roller and the first drive roller and conveys continuous paper, and the downstream side of the base shaft drive roller and the first drive roller. A third detection unit that is provided upstream of the third drive roller and detects the tension of the continuous paper, and the control unit is configured to detect the third drive roller based on a detection result of the third detection unit. It is preferable to vary the rotation speed of.

  According to this, at least two drive rollers are provided on the downstream side of the printing unit. Therefore, even on the downstream side of the printing unit, the fluctuation of the continuous paper can be suitably reduced by these two driving rollers. The two driving rollers are the other of the base shaft driving roller and the first driving roller, and the third driving roller.

  Here, a conveyance section defined by two drive rollers provided on the downstream side of the printing unit is referred to as a “downstream conveyance section”. The third detection unit detects the tension of the continuous paper in the downstream conveyance section. The control unit varies the rotational speed of the third drive roller based on the detection result of the third detection unit, and adjusts the tension of the continuous paper in the downstream conveyance section. Thereby, the fluctuation | variation of a continuous paper can be suppressed further further in the downstream of a downstream conveyance area.

  As described above, even if the continuous paper is disturbed on the downstream side of the third driving roller (that is, the downstream side of the downstream conveyance section) by the arrangement of the driving roller and the control by the control unit, the printing unit On the other hand, continuous paper can be conveyed appropriately. Therefore, the printing unit can appropriately print continuous paper.

  In the above-described invention, it is preferable that the control unit controls the third driving roller so that the tension of the continuous paper detected by the third detection unit is constant. According to this, stable continuous paper conveyance can be realized.

  In the above-described invention, the control unit includes the first driving roller so that the tension of the continuous paper detected by the third detection unit is higher than the tension of the continuous paper detected by the first detection unit. It is preferable to control the third driving roller. In other words, the control unit performs control so that the tension of the continuous paper is greater in the downstream conveyance section than in the printing conveyance section. According to this, it is possible to further prevent the continuous paper from being transmitted from the downstream conveyance section to the printing conveyance section.

The printing apparatus of the present invention is a printing apparatus, a printing unit for printing on continuous paper in a continuous paper and non-contact state, provided on one of the upstream side or downstream side of the printing section, the paper web A drive shaft driving roller, provided on the other upstream or downstream side of the printing unit, provided on the upstream side of the first drive roller for conveying continuous paper, the drive shaft for the base shaft and the first drive roller; A second drive roller that conveys continuous paper, a first detection unit that is provided between the base shaft drive roller and the first drive roller and detects the tension of the continuous paper, the base shaft drive roller, and the first drive roller And a second detection unit that is provided on the downstream side of the second drive roller and detects the tension of the continuous paper, and the rotational speed of the first drive roller based on the detection result of the first detection unit And the second detection A control unit for varying the rotation speed of the second drive roller based on a detection result of, disposed on the downstream side of said base shaft driving roller and the first driving roller, and a third driving roller for conveying the continuous sheet, wherein A third detection unit that is provided downstream of the base drive roller and the first drive roller and upstream of the third drive roller and detects the tension of the continuous paper, and the control unit includes the first drive roller and the third drive roller . The rotation speed of the third drive roller is varied based on the detection result of the three detection unit, and the control unit continuously detects the tension of the continuous paper detected by the third detection unit by the first detection unit. In the printing apparatus, the first driving roller and the third driving roller are controlled so as to be higher than the tension of the paper .

  [Operation / Effect] According to the printing apparatus of the present invention, the base shaft driving roller, the first driving roller, and the second driving roller respectively convey continuous paper from the upstream side to the downstream side. The printing unit prints on the continuous paper without contact with the conveyed continuous paper.

  At least two drive rollers are provided on the upstream side of the printing unit. The two driving rollers are one of the base shaft driving roller and the first driving roller and the second driving roller. These two drive rollers can sufficiently reduce fluctuations in continuous paper.

  Here, a conveyance section defined by two drive rollers provided on the upstream side of the printing unit is referred to as an “upstream conveyance section”, and a conveyance section defined by the base drive roller and the first drive roller is referred to as “printing conveyance”. This is called “interval”.

  The first detection unit detects the tension of the continuous paper in the printing conveyance section, and the second detection unit detects the tension of the continuous paper in the upstream conveyance section. The control unit varies the rotation speed of the first drive roller based on the detection result of the first detection unit, and adjusts the tension of the continuous paper in the printing conveyance section. Further, the control unit varies the rotation speed of the second drive roller based on the detection result of the second detection unit, and adjusts the tension of the continuous paper in the upstream conveyance section. Thereby, the fluctuation | variation of continuous paper can be suppressed further.

  As described above, the variation of the continuous paper can be suitably suppressed by the arrangement of the driving roller and the control by the control unit. Therefore, even when the continuous paper is disturbed on the upstream side of the second drive roller (that is, upstream of the upstream conveyance section), the continuous paper can be appropriately conveyed to the printing unit. . That is, although the printing unit does not contact the continuous paper, the continuous paper on which the printing unit performs printing is kept in a state in which fluctuation is suppressed. Therefore, the printing unit can appropriately print continuous paper.

Further, at least two drive rollers are provided on the downstream side of the printing unit. Therefore, even on the downstream side of the printing unit, the fluctuation of the continuous paper can be suitably reduced by these two driving rollers. The two driving rollers are the other of the base shaft driving roller and the first driving roller, and the third driving roller.

  Here, a conveyance section defined by two drive rollers provided on the downstream side of the printing unit is referred to as a “downstream conveyance section”. The third detection unit detects the tension of the continuous paper in the downstream conveyance section. The control unit varies the rotational speed of the third drive roller based on the detection result of the third detection unit, and adjusts the tension of the continuous paper in the downstream conveyance section. Thereby, the fluctuation | variation of a continuous paper can be suppressed further further in the downstream of a downstream conveyance area.

  As described above, even if the continuous paper is disturbed on the downstream side of the third driving roller (that is, the downstream side of the downstream conveyance section) by the arrangement of the driving roller and the control by the control unit, the printing unit On the other hand, continuous paper can be conveyed appropriately. Therefore, the printing unit can appropriately print continuous paper.

In the present invention, the control unit may be configured such that the tension of the continuous paper detected by the third detection unit is higher than the tension of the continuous paper detected by the first detection unit. The roller and the third drive roller are controlled. In other words, the control unit performs control so that the tension of the continuous paper is greater in the downstream conveyance section than in the printing conveyance section. According to this, it is possible to further prevent the continuous paper from being transmitted from the downstream conveyance section to the printing conveyance section.

  In the above-described invention, it is preferable that the control unit controls the third driving roller so that the tension of the continuous paper detected by the third detection unit is constant. According to this, stable continuous paper conveyance can be realized.

  In the above-described invention, it is preferable that the base driving roller is provided on the upstream side of the printing unit, and the first driving roller is provided on the downstream side of the printing unit. According to this, the 1st drive roller from which a rotational speed changes according to the detection result of a 1st detection part is arrange | positioned not the upstream of a printing part but the downstream of a printing part. For this reason, the speed of the continuous paper in the conveyance section for printing can be stabilized more.

  In the invention described above, the control unit controls the first drive roller so that the tension of the continuous paper detected by the first detection unit is constant, and the continuous paper detected by the second detection unit is controlled. It is preferable to control the second drive roller so that the tension is constant. According to this, stable continuous paper conveyance can be realized.

  The invention described above further includes a speed detection unit that is provided between the base shaft driving roller and the printing unit and detects the speed of the continuous paper, and the printing unit has a timing according to a detection result of the speed detection unit. It is preferable to perform printing. The speed detection unit is arranged at a position closer to the base shaft drive roller rather than the first drive roller. Therefore, the speed of the continuous paper detected by the speed detection unit is relatively stable. Since the printing unit prints at a timing according to the detection result of the speed detection unit, the printing accuracy can be further improved.

  In the above-described invention, it is preferable that the printing unit prints by an inkjet method. According to this, an inkjet printing apparatus can be suitably realized.

  In the above-described invention, it is preferable that the control unit adjusts the rotation speed of the base shaft driving roller to be constant. According to this, the speed at which the continuous paper passes through the printing unit can be further stabilized.

  Further, the printing system of the present invention includes a plurality of the above-described printing devices, and each printing device delivers continuous paper to each other while printing on continuous paper. An inter-device detection unit that detects the tension of continuous paper between the control units in the printing device adjacent to the downstream side of the inter-device detection unit, based on the detection result of the inter-device detection unit, The printing system performs uniform control to increase or decrease the rotational speeds of the base drive roller, the first drive roller, and the second drive roller in the printing apparatus by the same amount.

  [Operation / Effect] According to the printing system of the present invention, the continuous paper is sequentially conveyed to a plurality of printing apparatuses and printed by each printing apparatus. Here, a conveyance section between the printing apparatus and the printing apparatus is referred to as an “inter-apparatus conveyance section”. The inter-apparatus detection unit detects the tension of the continuous paper in at least one inter-apparatus conveyance section.

  Each component in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit operates as follows. In addition to the control of the first drive roller based on the detection result of the first detection unit and the control of the second drive roller based on the detection result of the second detection unit, the control unit is uniformly based on the detection result of the inter-device detection unit. Take control. Here, the uniform control means increasing or decreasing the rotational speed of each driving roller by the same amount. By this uniform control, the speed of the continuous paper is uniformly increased or decreased over the upstream conveyance section and the printing conveyance section. However, since the difference in rotational speed between the driving rollers does not change, the tension of the continuous paper in the upstream conveyance section and the printing conveyance section does not change. That is, when uniform control is performed, only the speed of the continuous paper changes as a whole while the tension of the continuous paper is kept substantially constant. According to such uniform control, even if the continuous paper is disturbed in the inter-device conveyance section, the fluctuation of the continuous paper can be suppressed in the printing apparatus. Therefore, the printing unit can appropriately print continuous paper.

  In the above-described invention, the control unit in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit performs the uniform control when the tension of the continuous paper detected by the inter-apparatus detection part is equal to or less than a threshold value. Preferably, the uniform control is performed when the tension of the continuous paper detected by the inter-device detection unit exceeds the threshold value. According to this, each component in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit operates as follows.

  When the detection result of the inter-apparatus detection unit is less than or equal to the threshold value, it can be said that the disturbance that the continuous paper receives in the inter-apparatus conveyance section is relatively small. In this case, the control unit does not perform uniform control. Even if uniform control is not performed, fluctuations in continuous paper can be suppressed by at least two drive rollers provided on the upstream side of the printing unit. In addition, the control unit controls the first and second drive rollers based on the detection results of the first and second detection units, respectively, so that fluctuations in continuous paper can be further suppressed. As described above, when the continuous paper is subjected to a relatively small disturbance in the inter-apparatus conveyance section, the fluctuation of the continuous paper can be suitably suppressed without performing uniform control. Thereby, the frequency of performing uniform control can be reduced, and there is no possibility that the conveyance of continuous paper becomes unstable.

  On the other hand, when the detection result of the inter-apparatus detection unit exceeds the threshold, it can be said that the disturbance that the continuous paper receives in the inter-apparatus conveyance section is relatively large. In this case, the control unit performs uniform control. Thereby, when a continuous paper receives a comparatively large disturbance in the conveyance section between apparatuses, the fluctuation | variation of a continuous paper can be suppressed effectively.

  As described above, the control unit selectively performs uniform control according to the magnitude of the disturbance that the continuous paper receives in the inter-apparatus conveyance section. Thereby, appropriate conveyance of continuous paper can always be realized.

  In the above-described invention, the control unit in the printing apparatus adjacent to the downstream side of the inter-device detection unit is configured to individually control the rotation speed of the first drive roller based on the detection result of the first detection unit. Further, it is preferable that the uniform control is performed more slowly than the individual control in which the rotation speed of the second drive roller is varied based on the detection result of the second detection unit. According to this, each component in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit operates as follows.

  The control unit performs uniform control more slowly than individual control. Here, “slowly” is exemplified by extending the dead time in uniform control compared to individual control, or decreasing the rate of change per unit time of rotational speed in uniform control compared to individual control. Is done. And if the dead time in uniform control is made comparatively long, the frequency of uniform control can be reduced. Further, if the rate of change of the rotational speed of the driving roller in the uniform control is made relatively small, it is possible to prevent the continuous paper speed from changing sharply. As described above, since the uniform control is performed more slowly than the individual control, it is possible to suitably prevent the conveyance of the continuous paper in the printing apparatus from becoming unstable.

  On the other hand, the control unit performs individual control relatively quickly compared to the uniform control. Thereby, even if the tension of the continuous paper fluctuates in the printing conveyance section or / and the upstream conveyance section, the fluctuation of the tension can be canceled relatively quickly.

The printing system of the present invention, includes a plurality of printing devices, while passing the printing apparatus together undergo continuous sheet, in a printing system for printing on continuous paper, the printing device is a continuous sheet and a non-contact state A printing unit that prints on continuous paper, provided on one of the upstream or downstream side of the printing unit, and provided on one of the upstream side and downstream side of the printing unit, A first drive roller that conveys paper, a second drive roller that is provided upstream of the base shaft drive roller and the first drive roller, and that conveys continuous paper, and between the base shaft drive roller and the first drive roller A first detector for detecting the tension of the continuous paper; and provided upstream of the base shaft driving roller and the first driving roller and downstream of the second driving roller, detection The rotation speed of the first drive roller is varied based on the detection result of the second detection section and the first detection section, and the rotation speed of the second drive roller is determined based on the detection result of the second detection section. A control unit that varies, and the printing system further includes an inter-device detection unit that detects a tension of continuous paper between at least one pair of adjacent printing devices, and the downstream side of the inter-device detection unit The control unit in the printing apparatus adjacent to each of the base drive roller, the first drive roller, and the second drive roller in the printing apparatus based on the detection result of the inter-device detection unit. Uniform control for increasing or decreasing the rotational speed by the same amount is performed, and the control unit in the printing apparatus adjacent to the downstream side of the inter-device detection unit performs the first drive based on the detection result of the first detection unit. Roller rotation speed Varying individually controlled, and the rotational speed of the second drive roller based on a second detection unit of the detection result as compared to the individual control for varying a printing system slowly performing the uniform control.

  [Operation / Effect] According to the printing system of the present invention, the continuous paper is sequentially conveyed to a plurality of printing apparatuses and printed by each printing apparatus. Here, a conveyance section between the printing apparatus and the printing apparatus is referred to as an “inter-apparatus conveyance section”. The inter-apparatus detection unit detects the tension of the continuous paper in at least one inter-apparatus conveyance section.

  Each component in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit operates as follows. In addition to the control of the first drive roller based on the detection result of the first detection unit and the control of the second drive roller based on the detection result of the second detection unit, the control unit is based on the detection result of the inter-device detection unit. Take control. Here, the uniform control means increasing or decreasing the rotational speed of each driving roller by the same amount. By this uniform control, the speed of the continuous paper is uniformly increased or decreased over the upstream conveyance section and the printing conveyance section. However, since the difference in rotational speed between the driving rollers does not change, the tension of the continuous paper in the upstream conveyance section and the printing conveyance section does not change. That is, when uniform control is performed, only the speed of the continuous paper changes as a whole while the tension of the continuous paper is kept substantially constant. According to such uniform control, even if the continuous paper is disturbed in the inter-device conveyance section, the fluctuation of the continuous paper can be suppressed in the printing apparatus. Therefore, the printing unit can appropriately print continuous paper.

  In the above-described invention, the control unit in the printing apparatus adjacent to the downstream side of the inter-device detection unit is configured to individually control the rotation speed of the first drive roller based on the detection result of the first detection unit. Further, it is preferable that the uniform control is performed more slowly than the individual control in which the rotation speed of the second drive roller is varied based on the detection result of the second detection unit. According to this, each component in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit operates as follows.

  The control unit performs uniform control more slowly than individual control. Here, “slowly” is exemplified by extending the dead time in uniform control compared to individual control, or decreasing the rate of change per unit time of rotational speed in uniform control compared to individual control. Is done. And if the dead time in uniform control is made comparatively long, the frequency of uniform control can be reduced. Further, if the rate of change of the rotational speed of the driving roller in the uniform control is made relatively small, it is possible to prevent the continuous paper speed from changing sharply. As described above, since the uniform control is performed more slowly than the individual control, it is possible to suitably prevent the conveyance of the continuous paper in the printing apparatus from becoming unstable.

  On the other hand, the control unit performs individual control relatively quickly compared to the uniform control. Thereby, even if the tension of the continuous paper fluctuates in the printing conveyance section or / and the upstream conveyance section, the fluctuation of the tension can be canceled relatively quickly.

  In the above-described invention, the control unit in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit performs the uniform control when the tension of the continuous paper detected by the inter-apparatus detection part is equal to or less than a threshold value. Preferably, the uniform control is performed when the tension of the continuous paper detected by the inter-device detection unit exceeds the threshold value. According to this, each component in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit operates as follows.

  When the detection result of the inter-apparatus detection unit is less than or equal to the threshold value, it can be said that the disturbance that the continuous paper receives in the inter-apparatus conveyance section is relatively small. In this case, the control unit does not perform uniform control. Even if uniform control is not performed, fluctuations in continuous paper can be suppressed by at least two drive rollers provided on the upstream side of the printing unit. In addition, the control unit controls the first and second drive rollers based on the detection results of the first and second detection units, respectively, so that fluctuations in continuous paper can be further suppressed. As described above, when the continuous paper is subjected to a relatively small disturbance in the inter-apparatus conveyance section, the fluctuation of the continuous paper can be suitably suppressed without performing uniform control. Thereby, the frequency of performing uniform control can be reduced, and there is no possibility that the conveyance of continuous paper becomes unstable.

  On the other hand, when the detection result of the inter-apparatus detection unit exceeds the threshold, it can be said that the disturbance that the continuous paper receives in the inter-apparatus conveyance section is relatively large. In this case, the control unit performs uniform control. Thereby, when a continuous paper receives a comparatively large disturbance in the conveyance section between apparatuses, the fluctuation | variation of a continuous paper can be suppressed effectively.

  As described above, the control unit selectively performs uniform control according to the magnitude of the disturbance that the continuous paper receives in the inter-apparatus conveyance section. Thereby, appropriate conveyance of continuous paper can always be realized.

  In the above-described invention, in the case of the uniform control, the control unit in the printing apparatus adjacent to the downstream side of the inter-device detection unit is configured to use the base shaft driving roller, the first driving roller, and the second driving roller. It is preferable to increase / decrease the rotational speed of each step. According to this, in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit, the speed of the continuous paper does not change abruptly, so that it is possible to preferably avoid the unstable conveyance of the continuous paper.

  In the above-described invention, the printing apparatus further includes a reversing unit that is provided between the printing devices and reverses continuous paper, and the inter-device detection unit is adjacent to the reversing unit and the downstream side of the reversing unit. It is preferable that it is provided between. According to this, the inter-device detection unit is provided at least accompanying the inversion unit. Therefore, even if the reversing unit gives disturbance to the continuous paper, each printing apparatus can perform printing appropriately.

  The present specification also discloses an invention relating to the following printing apparatus and printing system.

  (1) In the printing apparatus according to the above-described invention, the control unit adjusts the rotation speed of the base shaft driving roller regardless of the detection results of the first detection unit and the second detection unit.

  According to each invention described in said (1), the speed of the continuous paper in the printing conveyance area can be stabilized.

  (2) In the printing apparatus according to the above-described invention, the base drive roller and the first drive roller are respectively close to the printing unit.

  According to the invention as described in said (2), the printing conveyance area can be made comparatively short. For this reason, for example, when the controller changes the rotation speed of the first drive roller, it is reflected relatively quickly on the tension of the continuous paper in the printing conveyance section. Thus, the control responsiveness in the printing conveyance section can be improved.

  (3) In the printing apparatus according to the above-described invention, the control unit is configured so that each tension of the continuous paper detected by the first detection unit and the second detection unit is a type of continuous paper, a paper thickness, and a paper quality. A printing apparatus that controls the first drive roller and the second drive roller so as to have a predetermined value according to at least one of them.

  According to the invention as described in said (3), continuous paper can be conveyed with a more suitable tension. Note that the predetermined values corresponding to the first detection unit and the second detection unit may be different values or the same value.

  (4) In the printing apparatus according to the above-described invention, the control unit is configured such that the tension of the continuous paper detected by the third detection unit is a predetermined value corresponding to at least one of the type, paper thickness, and paper quality of the continuous paper. A printing apparatus that controls the third drive roller so as to obtain a value.

  According to the invention as described in said (4), continuous paper can be conveyed with a more suitable tension | tensile_strength.

  (5) In the printing apparatus according to the above-described invention, the control unit causes the continuous paper tension detected by the third detection unit to be equal to the tension of the continuous paper detected by the second detection unit. A printing apparatus for controlling the second drive roller and the third drive roller.

  According to the invention described in (5) above, the difference in the tension of the continuous paper before and after the base drive roller is equal to the difference in the tension of the continuous paper before and after the first drive roller. For this reason, it is possible to further stabilize the conveyance of the continuous paper in the printing conveyance section defined by the base shaft driving roller and the first driving roller.

  (6) In the printing apparatus according to the above-described invention, the control unit is configured such that the tension of the continuous paper detected by the second detection unit is approximately 1.1 of the tension of the continuous paper detected by the first detection unit. A printing apparatus that controls the first drive roller and the second drive roller so as to be doubled.

  According to the invention described in (6) above, the tension of the continuous paper in the upstream conveyance section is adjusted to about 1.1 times that of the printing conveyance section. In this case, the tension borne by the second drive roller is a tension corresponding to about 1.1 times the tension of the continuous paper in the printing conveyance section. That is, the second driving roller generates a tension corresponding to about 1.1 times the tension of the continuous paper in the printing conveyance section on the downstream side (that is, the upstream conveyance section). On the other hand, the tension borne by the driving roller (one of the base shaft driving roller and the first driving roller) adjacent to the upstream side of the printing unit is about 10% of the tension of the continuous paper in the printing conveyance section. As described above, it is possible to reduce the burden on the driving roller adjacent to the upstream side of the printing unit as compared with the second driving roller. For this reason, the drive roller adjacent to the upstream side of the printing unit can be controlled more finely than the second drive roller. As a result, it is possible to finely control the conveyance of the continuous paper in the printing conveyance section.

  (7) In the printing apparatus according to the above-described invention, the control unit is configured such that the tension of the continuous paper detected by the third detection unit is approximately 1.1 of the tension of the continuous paper detected by the first detection unit. A printing apparatus that controls the first drive roller and the third drive roller so as to be doubled.

  According to the invention as described in said (7), compared with the 3rd drive roller, the burden of the drive roller adjacent to the downstream of a printing part can be made small. For this reason, the drive roller adjacent to the downstream side of the printing unit can be more finely controlled, and as a result, the conveyance of the continuous paper in the printing conveyance section can be more finely controlled.

  (8) In the printing apparatus according to the above-described invention, the difference in tension before and after the second drive roller is larger than the difference in tension before and after the drive roller adjacent to the upstream side of the printing unit.

  (9) In the printing apparatus according to the above-described invention, the difference in tension before and after the third driving roller is larger than the difference in tension before and after the driving roller adjacent to the downstream side of the printing unit.

  According to the invention as described in said (8), compared with the 2nd drive roller, the burden of the drive roller adjacent to the upstream of a printing part can be made small. Further, according to the invention described in (9), it is possible to reduce the burden on the driving roller adjacent to the downstream side of the printing unit as compared with the third driving roller. Therefore, according to the inventions described in (8) and (9), the conveyance of the continuous paper in the printing conveyance section can be controlled more finely.

  (10) The printing apparatus according to the above-described invention, further comprising a base nip roller that presses the continuous paper from both sides together with the base drive roller.

  (11) The printing apparatus according to the above-described invention, further comprising a first nip roller for pressing the continuous paper from both sides together with the first drive roller.

  (12) The printing apparatus according to the invention described above, further comprising a second nip roller that presses the continuous paper from both sides together with the second drive roller.

  (13) The printing apparatus according to the above-described invention, further comprising a third nip roller that presses the continuous paper from both sides together with the third driving roller.

  According to the inventions described in (10) to (13), fluctuations in continuous paper can be effectively reduced in each drive roller.

  (14) In the printing apparatus according to the above-described invention, the printing unit is an inkjet head that drops ink.

  According to the invention described in (14), an ink jet printing apparatus can be suitably realized.

  (15) In the printing system according to the above-described invention, the inter-device detection unit is provided between adjacent printing devices.

  According to the invention as described in said (15), it can print suitably in each printing apparatus.

  (16) In the printing system according to the above-described invention, in the case of the uniform control, the control unit in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit includes the base shaft driving roller and the first drive. A printing system that gradually increases or decreases the rotational speeds of the roller and the second drive roller.

  According to the invention described in (16), since the speed of the continuous paper does not change rapidly in the printing apparatus adjacent to the downstream side of the inter-device detection unit, the conveyance of the continuous paper becomes unstable. This can be suitably suppressed.

  According to the printing apparatus according to the present invention, even when the continuous paper is disturbed further upstream of the two drive rollers provided on the upstream side of the printing unit, the two drive rollers may cause fluctuations in the continuous paper. Can be suitably weakened. In addition, the control unit varies the rotation speed of the first drive roller based on the detection result of the first detection unit, and varies the rotation speed of the second drive roller based on the detection result of the second detection unit. Thereby, each tension | tensile_strength of the continuous paper in an upstream conveyance area and the conveyance area for printing can be adjusted, and the fluctuation | variation of continuous paper can further be suppressed. Therefore, continuous paper can be appropriately conveyed to the printing unit. Therefore, the printing unit can appropriately print the continuous paper even though it does not contact the continuous paper.

  Further, according to the printing system of the present invention, the control unit in the printing apparatus adjacent to the downstream side of the inter-device detection unit performs uniform control based on the detection result of the inter-device detection unit. That is, the control unit increases or decreases the rotation speed of each drive roller in the printing apparatus by the same amount. By this uniform control, it is possible to adjust only the speed of the continuous paper while keeping the tension of the continuous paper substantially constant, thereby suppressing the fluctuation of the continuous paper. Therefore, the printing unit in the printing apparatus can appropriately print continuous paper.

1 is a diagram illustrating a configuration of a printing apparatus according to a first embodiment. It is a figure which shows the tension | tensile_strength of the continuous paper in a printing apparatus. FIG. 10 is a diagram illustrating a configuration of a printing system according to a second embodiment. FIG. 10 is a diagram illustrating a configuration of a printing apparatus included in a printing system according to a second embodiment.

  Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating the configuration of the printing apparatus according to the first embodiment.

1. Schematic Configuration The printing apparatus 1 according to the present embodiment is an apparatus that performs printing on a long continuous paper 3. Outside the printing apparatus 1, an unwinding device 5 that supplies the continuous paper 3 to the printing apparatus 1 and a winding device 7 that collects the continuous paper 3 discharged from the printing apparatus 1 are provided.

  The printing apparatus 1 includes a plurality of (four) drive rollers (10, 11, 12, 13), a printing unit 27, a tension detection unit (31, 32, 33), a speed detection unit 35, and a control unit 37. And. Each drive roller (10, 11, 12, 13) conveys the continuous paper 3 supplied from the unwinding device 5 to the printing device 1 in one direction, and sends it out of the device 1 (winding device 7). Each tension detector (31, 32, 33) detects the tension of the continuous paper 3. The speed detection unit 35 detects the speed of the continuous paper 3. The control unit 37 controls the drive roller based on the detection result of the tension detection unit (31, 32, 33). The printing unit 27 performs printing on the continuous paper 3 in a non-contact state with the continuous paper 3. The printing unit 27 performs printing at a timing according to the detection result of the speed detection unit 35. Each configuration will be specifically described below.

2. Conveying system and printing unit Specifically, the driving roller is a base driving roller 10, a first driving roller 11, a second driving roller 12, and a third driving roller 13. These are arranged in the order of the second driving roller 12, the base shaft driving roller 10, the first driving roller 11, and the third driving roller 13 from the upstream side to the downstream side in the conveyance direction of the continuous paper 3. The printing unit 27 is disposed between the base shaft driving roller 10 and the first driving roller 11. Hereinafter, “upstream side in the conveyance direction of the continuous paper 3” is appropriately referred to as “upstream side”, and “downstream side in the conveyance direction of the continuous paper 3” is appropriately referred to as “downstream side”.

  Then, the base drive roller 10 corresponds to a drive roller adjacent to the upstream side of the printing unit 27, and the second drive roller 12 corresponds to a drive roller adjacent to the upstream side of the base drive roller 10. The first driving roller 11 corresponds to a driving roller adjacent to the downstream side of the printing unit 27, and the third driving roller 13 corresponds to a driving roller adjacent to the downstream side of the first driving roller 11. Here, it is preferable that the base shaft driving roller 10 and the first driving roller 11 are respectively close to the printing unit 27.

  The drive rollers 10, 11, 12, and 13 are connected to motors 15, 16, 17, and 18, respectively, and are rotated by the power of the motors 15, 16, 17, and 18. Nip rollers 20, 21, 22, and 23 are attached to the drive rollers 10, 11, 12, and 13, respectively. The nip rollers 20, 21, 22, and 23 are rotatably provided. Each driving roller 10, 11, 12, 13 presses the continuous paper 3 from both sides together with the corresponding nip rollers 20, 21, 22, 23. A driven roller 25 is further provided in the conveyance path of the continuous paper 3. Each driven roller 25 is rotatably provided to guide the continuous paper 3. The nip rollers 20, 21, 22, and 23 correspond to the basic shaft nip roller, the first nip roller, the second nip roller, and the third nip roller in the present invention, respectively.

  Here, the conveyance section of the continuous paper 3 defined by the second drive roller 12 and the base drive roller 10 is referred to as “upstream conveyance section Lu”, and the continuous paper defined by the base drive roller 10 and the first drive roller 11. 3 is referred to as a “printing transport section Lp”, and a transport section of the continuous paper 3 defined by the first drive roller 11 and the third drive roller 13 is referred to as a “downstream transport section Ld”. Note that the printing unit 27 is disposed in the printing conveyance section Lp.

  The printing unit 27 prints on the continuous paper 3 by an inkjet method. Specifically, the printing unit 27 includes an inkjet head having a plurality of nozzles (not shown) that can eject ink droplets. The printing unit 27 is provided above the continuous paper 3 and separated from the continuous paper 3. Then, the printing unit 27 performs printing on the surface of the continuous paper 3 without contacting the continuous paper 3. A driven roller 28 is provided at a position on the back side of the continuous paper 3 and facing the printing unit 27. The driven roller 28 is rotatably provided to keep the continuous paper 3 in a flat state.

  Further, the printing apparatus 1 includes a drying unit 29. The drying unit 29 is provided in the downstream conveyance section Lp and dries the printed continuous paper 3.

3. Specifically, the detection unit is a first tension detection unit 31, a second tension detection unit 32, and a third tension detection unit 33. The first tension detector 31 is provided in the printing transport section Lp, and detects the tension (tension) of the continuous paper 3 in the transport section Lp. In the present embodiment, the first tension detecting unit 31 is disposed between the base shaft driving roller 10 and the printing unit 27. The second tension detector 32 is provided in the upstream conveyance section Lu, and detects the tension of the continuous paper 3 in the conveyance section Lu. The third tension detector 33 is provided in the downstream conveyance section Ld and detects the tension of the continuous paper 3 in the conveyance section Ld. Each tension detection unit 31, 32, 33 is realized by, for example, a pressure sensor. The first, second, and third tension detectors 31, 32, and 33 correspond to the first detector, the second detector, and the third detector, respectively, in this invention.

  The speed detection unit 35 detects the speed of the continuous paper 3. The speed detection unit 35 is disposed between the base shaft driving roller 10 and the printing unit 27. In the present embodiment, the speed detection unit 35 is disposed between the first detection unit 31 and the printing unit 27. The speed detection unit 35 is preferably in the vicinity of the printing unit 27. For example, the speed detection unit 35 is preferably disposed at a position facing the printing unit 27 with the continuous paper 3 interposed therebetween. The speed detection unit 35 is configured by an encoder, for example.

4). Control Unit The control unit 37 receives the detection results of the first, second, and third tension detection units 31, 32, and 33 and the detection result of the speed detection unit 35. The control unit 37 outputs a command to the motors 15, 16, 17, and 18. The motors 15, 16, 17, and 18 rotate and drive the base shaft driving roller 10 and the first, second, and third driving rollers 11, 12, and 13, respectively, according to commands. Thus, the control unit 37 controls the base shaft driving roller 10 and the first, second, and third driving rollers 11, 12, and 13.

  Further, the control unit 37 has information such as the conveyance conditions of the continuous paper 3. Examples of the conveyance conditions include a set value (predetermined value VR) of the rotational speed of the base shaft driving roller 10 and a set value (predetermined values TH, TL) of the tension of the continuous paper 3 in each of the conveyance sections Lu, Lp, Ld. . These predetermined values VR, TH, and TL are constants. These predetermined values VR, TH, and TL are preferably set according to at least one of the type of continuous paper 3, the paper thickness, and the paper quality.

  The control unit 37 includes a central processing unit (CPU) that executes various types of processing, a RAM (Random-Access Memory) that serves as a work area for arithmetic processing, and a fixed disk that stores various types of information such as the transport conditions described above. This is realized by a storage medium or the like.

5. Operation Next, the operation of the printing apparatus 1 according to the first embodiment will be described.

  The continuous paper 3 is drawn into the printing apparatus 1 from an unwinding device 5 that is an external device. In the printing apparatus 1, the continuous paper 3 is wound around the driving rollers 10, 11, 12, 13 and the driven rollers 25, 28 in a predetermined order. Then, the continuous paper 3 is again drawn out of the printing apparatus 1 and drawn into the winding device 7.

  When the control unit 37 rotationally drives the driving rollers 10, 11, 12, and 13, the driving rollers 10, 11, 12, and 13 hold the continuous paper 3 together with the corresponding nip rollers 22, 20, 21, and 23, respectively. The continuous paper 3 is conveyed. Accordingly, the continuous paper 3 is transported in the order of the upstream transport section Lu, the printing transport section Lp, and the downstream transport section Ld, and is discharged from the printing apparatus 1. Along with this, the unwinding device 5 supplies the continuous paper 3 to the printing device 1, and the winding device 7 collects the continuous paper 3 discharged by the printing device 1.

  In the printing conveyance section Lp, the speed detection unit 35 detects the speed of the continuous paper 3. The printing unit 27 (inkjet head) ejects ink droplets onto the continuous paper 3 at a timing according to the detection result of the speed detection unit 35. Accordingly, the printing unit 27 performs printing on the continuous paper 3 in a non-contact state with the continuous paper 3. In the downstream conveyance section Ld, the drying unit 29 dries the printed continuous paper 3.

  Below, the conveyance control of the continuous paper 3 by the control part 37 is demonstrated in detail.

  Each of the tension detection units 31, 32, and 33 detects the tension of the continuous paper 3 and gives the detection result to the control unit 37.

  The control unit 37 controls the drive rollers 10, 11, 12, and 13 based on these detection results and conveyance conditions. In the present embodiment, the control unit 37 controls the base shaft driving roller 10 based on the conveyance conditions. Further, the first drive roller 11 is controlled based on the detection result of the first tension detector 31. Similarly, the second drive roller 12 is controlled based on the detection result of the second tension detection unit 32, and the third drive roller 13 is controlled based on the detection result of the third tension detection unit 33. Hereinafter, the control contents will be described separately for each of the drive rollers 10, 11, 12, and 13.

  For the base shaft driving roller 10, the control unit 37 adjusts the rotational speed of the base shaft driving roller 10 so that the rotational speed of the base shaft driving roller 10 is equal to the predetermined value VR. Note that the control of the base shaft driving roller 10 has nothing to do with the detection results of the tension detection units 31, 32, 33.

  For the first drive roller 11, the control unit 37 matches the tension of the continuous paper 3 detected by the first tension detection unit 31 (that is, the tension of the continuous paper 3 in the printing conveyance section Lp) with a predetermined value TL. As described above, the rotational speed of the first drive roller 11 is varied.

  For example, when the tension of the continuous paper 3 detected by the first tension detector 31 becomes smaller than the predetermined value TL, the rotation speed of the first drive roller 11 is increased. Since the rotational speed of the base shaft driving roller 10 is constant (predetermined value VR), the difference in rotational speed between the first driving roller 11 and the base shaft driving roller 10 is increased by the amount by which the rotational speed of the first driving roller 11 is increased. Become. As the rotational speed difference increases, the tension of the continuous paper 3 in the printing conveyance section Lp increases and approaches the predetermined value TL. On the other hand, when the detection result of the first tension detection unit 31 becomes larger than the predetermined value TL, the rotation speed of the first drive roller 11 is decreased. Thereby, the difference in rotational speed between the first drive roller 11 and the base shaft drive roller 10 is reduced. Along with this, the tension of the continuous paper 3 in the printing conveyance section Lp decreases and approaches the predetermined value TL.

  In this way, by varying the rotation speed of the first drive roller 11, the difference in rotation speed between the drive rollers 11 and 10 is adjusted, and the continuous paper 3 in the printing conveyance section Lp defined by the both drive rollers 3. Adjust the tension. Since the rotation speed of the base shaft driving roller 10 is constant (predetermined value VR), the above-described adjustment can be easily performed only by changing the rotation speed of the first driving roller 11.

  For the second drive roller 12, the control unit 37 matches the tension of the continuous paper 3 detected by the second tension detection unit 32 (that is, the tension of the continuous paper 3 in the upstream conveyance section Lu) with a predetermined value TH. As described above, the rotational speed of the second drive roller 12 is varied. As a result, the difference in rotational speed between the drive rollers 12 and 10 can be easily adjusted, and the tension of the continuous paper 3 in the upstream conveyance section Lu defined by both drive rollers can be easily adjusted. .

  For the third drive roller 13, the control unit 37 matches the tension of the continuous paper 3 detected by the third tension detection unit 33 (that is, the tension of the continuous paper 3 in the downstream conveyance section Ld) with a predetermined value TH. As described above, the rotational speed of the third drive roller 13 is varied. Note that the rotation speed of the first drive roller 11 adjacent to the third drive roller 13 is not adjusted to be constant. However, even in this case, the control unit 37 adjusts the difference in rotation speed between the drive rollers 13 and 11 by changing only the rotation speed of the third drive roller 13, and is defined by both the drive rollers. The tension of the continuous paper 3 in the downstream conveyance section Ld is adjusted.

  Here, the predetermined value TH is preferably higher than the predetermined value TL (TH> TL). For example, the predetermined value TH is preferably about 1.1 times the predetermined value TL.

  The predetermined value TH is preferably equal to or more than several times the tension of the continuous paper 3 on the further downstream side of the downstream conveyance section Ld (the conveyance section indicated by the reference numeral “Ldd” in FIG. 1). According to this, even if the continuous paper 3 fluctuates in the transport section Ldd, it is possible to suitably prevent the fluctuation of the continuous paper 3 from being transmitted to the downstream transport section Ld. The conveyance section Ldd has the same meaning as “the downstream side of the third drive roller 13”. Further, in FIG. 1, reference numeral “Luu” indicates a transport section further upstream than the upstream transport section Lu. The conveyance section Luu is synonymous with “upstream side of the second drive roller 12”.

  As the value of the predetermined value TH, for example, a value within a range of 20 [kgf] to 30 [kgf] is exemplified. However, the predetermined value TH is not limited to this numerical example, and an appropriate value can be designed and selected.

  As a result of the control described above, in the printing apparatus 1, the speed of the continuous paper 3 basically depends on the rotation speed of the base shaft driving roller 10 and is kept substantially constant. In particular, the speed of the continuous paper 3 is more stable in the printing conveyance section Lp, which is on the downstream side of the base shaft driving roller 10, as compared with the other conveyance sections Lu and Ld.

  FIG. 2 is a diagram illustrating the tension of the continuous paper 3 in the printing apparatus 1. In FIG. 2, the horizontal axis is the position of the continuous paper 3 on the conveyance path. The right side of the horizontal axis indicates the upstream side, and the left side indicates the downstream side. Therefore, the direction from the right side to the left side of the horizontal axis corresponds to the conveyance direction of the continuous paper 3. The vertical axis represents the tension of the continuous paper 3. As shown in the drawing, the tension of the continuous paper 3 in the transport sections Ld, Lp, and Lu is adjusted to predetermined values TH, TL, and TH, respectively.

  As shown in the drawing, the second driving roller 12 significantly increases the tension of the continuous paper 3 before and after the second driving roller 12. The base shaft driving roller 10 reduces the tension of the continuous paper 3 to a small extent before and after that. The first drive roller 11 increases the tension of the continuous paper 3 to a small width. The third drive roller 13 significantly reduces the tension of the continuous paper 3. That is, the tension difference ΔT0 before and after the base shaft driving roller 10 is smaller than the tension difference ΔT2 before and after the second driving roller 12. Further, the tension difference ΔT1 before and after the first drive roller 11 is smaller than the tension difference ΔT3 before and after the third drive roller 13. In other words, the second drive roller 12 and the third drive roller 13 produce a relatively large tension, while the base shaft drive roller 10 and the first drive roller 11 adjust the tension within a relatively small range. Yes. As is clear from this, the power load on the base shaft drive roller 10 and the first drive roller 11 is relatively small compared to the power load on the second and third drive rollers 12 and 13 being large.

  As described above, according to the printing apparatus 1 according to the first embodiment, the plurality (two) of the drive rollers 10 and 12 are provided on the upstream side of the printing unit 27. For this reason, for example, even when the continuous paper 3 fluctuates on the upstream side Luu of the second drive roller 12 due to the disturbance of the continuous paper 3 from the unwinding device 5, the continuous drive 3 is continuously performed by the two drive rollers 10 and 12. The fluctuation of the paper 3 can be suitably reduced.

  Similarly, a plurality (two) of driving rollers 11 and 13 are also provided on the downstream side of the printing unit 27. Therefore, for example, even if the continuous paper 3 is disturbed on the downstream side Ldd of the third drive roller 13 due to the disturbance from the winding device 7, the continuous paper 3 is driven by the two drive rollers 11 and 13. It is possible to suitably reduce fluctuations in

  Further, the control unit 37 varies the rotational speed of the first drive roller 11 based on the detection result of the first tension detection unit 31, and adjusts the tension of the continuous paper 3 in the printing conveyance section Lp to a predetermined value TL. Further, the control unit 37 varies the rotational speed of the second drive roller 12 based on the detection result of the second tension detection unit 32, and adjusts the tension of the continuous paper 3 in the upstream conveyance section Lu to a predetermined value TH. In this manner, the control unit 37 individually controls the tension of the continuous paper 3 for each of the transport sections Lu and Lp. Thereby, even if the continuous paper 3 fluctuates in the upstream side Luu of the upstream conveyance section Lu, the fluctuation of the continuous paper 3 can be further suppressed.

  Similarly, the control unit 37 varies the rotational speed of the third drive roller 13 based on the detection result of the third tension detection unit 33, and adjusts the tension of the continuous paper 3 in the downstream conveyance section Ld to a predetermined value TH. . As described above, the control unit 37 individually controls the tension of the continuous paper 3 in the transport section Ld. Thereby, even if the continuous paper 3 fluctuates in the downstream Ldd of the downstream conveyance section Ld, the fluctuation of the continuous paper 3 can be further suppressed.

  As described above, the variation of the continuous paper 3 can be suitably suppressed by the arrangement of the driving rollers 10, 11, 12, and 13 with respect to the printing unit 27 and the control by the control unit 37. For this reason, even if the continuous paper 3 fluctuates due to disturbance, the continuous paper 3 can be appropriately conveyed to the printing unit 27. That is, although the printing unit 27 does not come into contact with the continuous paper 3, the continuous paper 3 on which the printing unit 27 performs printing is kept in a state in which fluctuation is suppressed. Therefore, the printing unit 27 can appropriately print the continuous paper 3.

  Further, since the nip rollers 20, 21, 22, and 23 are provided, the fluctuation of the continuous paper 3 can be effectively reduced in each of the drive rollers 10, 11, 12, and 13.

  Further, the control unit 37 adjusts the rotation speed of the base shaft driving roller 10 to be constant (predetermined value VR). For this reason, the speed at which the continuous paper 3 passes through the printing unit 27 can be suitably stabilized.

  Further, the control unit 37 controls the first drive roller 11 so that the detection result of the first tension detection unit 31 is constant (predetermined value TL). Similarly, the control unit 37 controls the second and third drive rollers 12 and 13 so that the detection results of the second and third tension detection units 32 and 33 are constant (predetermined value TH). Thereby, the tension of the continuous paper 3 in each of the transport sections Lp, Lu, Ld is kept constant, and stable transport of the continuous paper 3 can be realized.

  Further, the control unit 37 controls the upstream conveyance section Lu and the downstream conveyance section Ld so that the tension of the continuous paper 3 is larger than that of the printing conveyance section Lp. In general, when the tension difference is the same, fluctuations in the continuous paper 3 are less likely to be transmitted from a conveyance section having a high tension to a conveyance section having a low tension than from a conveyance section having a low tension to a conveyance section having a high tension. In the case of the present embodiment, the fluctuation of the continuous paper 3 is not easily transmitted to the printing transport section Lp from any of the transport sections Lu and Ld on both sides thereof. Therefore, it is possible to realize stable conveyance of the continuous paper 3 particularly in the printing conveyance section Lp.

  Further, the control unit 37 controls the tension difference ΔT0 before and after the base drive roller 10 to be smaller than the tension difference ΔT2 before and after the second drive roller 12. Thereby, compared with the 2nd drive roller 12, the power burden of the base shaft drive roller 10 becomes small, and the base shaft drive roller 10 can be adjusted with higher precision. As a result, the speed of the continuous paper 3 can be accurately controlled. Similarly, the control unit 37 controls the tension difference ΔT1 before and after the first drive roller 11 to be smaller than the tension difference ΔT3 before and after the third drive roller 13. Thereby, compared with the 3rd driving roller 13, the power burden of the 1st driving roller 11 becomes small, and the 1st driving roller 11 can be controlled with higher precision. As a result, the tension of the continuous paper 3 in the printing transport section Lp can be adjusted with high accuracy.

  Further, the base shaft driving roller 10 is provided not on the downstream side of the printing unit 27 but on the upstream side. For this reason, the speed of the continuous paper 3 in the printing conveyance section can be suitably stabilized.

  In addition, since the speed detection unit 35 is provided between the base shaft driving roller 10 and the printing unit 27, the position of the speed detection unit 35 is closer to the base shaft driving roller 10 than the first driving roller 11. For this reason, the speed detection unit 35 can detect the speed of the continuous paper 3 at a position where the speed is relatively stable. Further, since the speed detection unit 35 is provided in the vicinity of the printing unit 27, the speed of the continuous paper 3 passing through the printing unit 27 can be detected with high accuracy. The printing accuracy by the printing unit 27 can be further improved.

  Further, since the base shaft driving roller 10 and the first driving roller 11 are close to the printing unit 27, the printing conveyance section Lp is relatively short. As a result, the control of the first driving roller 11 by the control unit 37 is reflected relatively quickly on the tension of the continuous paper 3 in the printing conveyance section Lp. That is, the control responsiveness in the printing transport section Lp can be improved.

  Further, since the predetermined values VR, TH, and TL are set according to at least one of the type, paper thickness, and paper quality of the continuous paper 3, the continuous paper 3 can be conveyed at an appropriate speed and an appropriate tension. it can.

  In addition, the set value of the tension of the continuous paper 3 in the upstream conveyance section Lu and the downstream conveyance section Ld is equal to the predetermined value TH. For this reason, the tension difference ΔT0 of the continuous paper 3 before and after the base shaft driving roller 10 is equal to the tension difference ΔT1 of the continuous paper 3 before and after the first driving roller 11. That is, since the load (tension difference) applied to both ends of the printing conveyance section Lp is balanced, the conveyance of the continuous paper 3 can be further stabilized in the printing conveyance section Lp.

  Moreover, since the printing part 27 prints by an inkjet system, an inkjet printing apparatus can be implement | achieved suitably.

Next, Embodiment 2 of the present invention will be described with reference to the drawings.
FIG. 3 is a diagram illustrating a configuration of a printing system according to the second embodiment. In addition, about the same structure as Example 1, detailed description is abbreviate | omitted by attaching | subjecting a same sign.

  The printing system 50 according to the second embodiment includes a plurality (two) of printing apparatuses 1 and 51. The printing apparatus 1 is provided on the upstream side of the printing apparatus 51, and delivers the continuous paper 3 from the printing apparatus 1 to the printing apparatus 51. The printing apparatuses 1 and 51 perform printing on the continuous paper 3. Hereinafter, the conveyance section between the printing apparatus 1 and the printing apparatus 51 is referred to as an “inter-device conveyance section Lm”.

  A reversing unit 61 is provided in the inter-device conveyance section Lm. The reversing unit 61 reverses the front and back of the continuous paper 3. The reversing unit 61 includes a single or a plurality of turn bars (not shown) that change the conveyance angle of the continuous paper 3.

  Further, an inter-apparatus tension detector 63 is provided in the inter-apparatus transport section Lm. In the present embodiment, the inter-device tension detection unit 63 is disposed between the reversing unit 61 and the printing device 51. The inter-apparatus tension detector 63 detects the tension of the continuous paper 3 in the inter-apparatus conveyance section Lm. Then, the inter-device tension detection unit 63 outputs the detection result to the printing device 51. The inter-device tension detector 63 corresponds to the inter-device detector in the present invention.

  FIG. 4 is a diagram illustrating a configuration of the printing apparatus 51. Note that the configuration of the printing apparatus 1 is substantially the same as that shown in FIG.

  As shown in FIG. 4, the printing apparatus 51 has substantially the same configuration as the printing apparatus 1. However, the control unit 67 provided in the printing apparatus 51 is different from the control unit 37 provided in the printing apparatus 1. Hereinafter, the control unit 67 will be specifically described.

  In addition to the detection results of the tension detection units 31, 32, and 33, the detection result of the inter-device tension detection unit 63 is input to the control unit 67. The control unit 67 sets the rotation speed setting value (predetermined value VR) of the base shaft driving roller 10 and the tension setting value (predetermined value TH) of the continuous sheet 3 in each of the conveyance sections Lu, Lp, and Ld as the conveyance conditions of the continuous sheet 3. , TL) and the like, the tension threshold value Tth of the continuous paper 3 in the inter-apparatus conveyance section Lm is provided.

  The control unit 67 includes a central processing unit (CPU) that executes various processes, a RAM (Random-Access Memory) that is a work area for arithmetic processes, a fixed disk that stores various information such as the above-described transport conditions, and the like. This is realized by a storage medium or the like.

  Next, the operation of the printing system 50 according to the second embodiment will be described.

  The continuous paper 3 is drawn out from the unwinding device 5 which is an external device, passes through the printing device 1, the reversing unit 61 and the printing device 51, and is drawn into the winding device 7. The control unit 37 rotates and drives the drive rollers 10, 11, 12, and 13 in the printing apparatus 1, and the control unit 67 rotates and drives the drive rollers 10, 11, 12, and 13 in the printing apparatus 51. As a result, the continuous paper 3 is fed out from the unwinding device 5, sequentially conveyed to the printing device 1, the reversing unit 61, and the printing device 51 and collected by the winding device 7. The reversing unit 61 reverses the front and back of the continuous paper 3. Each printing unit 27 in the printing apparatuses 1 and 51 performs printing on the continuous paper 3 in a non-contact state with the continuous paper 3. As a result, printing is performed on both sides of the continuous paper 3.

  Further, the control units 37 and 67 control the conveyance of the continuous paper 3 in the printing apparatuses 1 and 51, respectively. The conveyance control by the control unit 37 is as described in detail in the operation description of the first embodiment. Below, the conveyance control by the control part 67 is demonstrated in detail. In the following description, each configuration refers to a configuration in the printing apparatus 51 unless otherwise specified. For example, when “base shaft driving roller 10” is described, it means the base shaft driving roller 10 in the printing apparatus 51.

  The control unit 67 receives the detection results of the tension detection units 31, 32, and 33 and the detection result of the inter-device tension detection unit 63. The controller 67 controls each of the drive rollers 10, 11, 12, and 13 based on these detection results and conveyance conditions. Here, in addition to the transport control described in the first embodiment, the control unit 67 performs uniform control. This uniform control is performed when the tension of the continuous paper 3 detected by the inter-apparatus tension detector 63 exceeds the threshold value Tth. Otherwise, no uniform control is performed.

  In the uniform control, the control unit 67 increases or decreases the rotational speeds of the drive rollers 10, 11, 12, and 13 by the same amount. For example, when the rotational speeds of the drive rollers 10, 11, 12, and 13 are V0, V1, V2, and V3, the rotational speeds of the drive rollers 10, 11, 12, and 13 are V0 ± α and V1 ± by uniform control. α, V2 ± α, and V3 ± α. Thereby, the conveyance speed of the continuous paper 3 is uniformly increased or decreased over the conveyance sections Lu, Lp, and Ld. However, since the difference in rotational speed between the adjacent drive rollers does not change, the tension of the continuous paper 3 in each conveyance section Lu, Lp, Ld is kept substantially constant. According to such uniform control, even if the tension of the continuous paper 3 fluctuates in the inter-device conveyance section Lm, the fluctuation of the continuous paper 3 can be suitably suppressed in the printing apparatus 51.

  Here, the threshold value Tth is preferably a value larger than the tension that the continuous paper 3 can normally take outside the printing apparatuses 1 and 51. The threshold value Tth is preferably a value corresponding to about one-sixth to about one-half of the predetermined value TH. The value of the threshold value Tth is preferably a value within the range of 5 to 10 [kgf]. The threshold value Tth is not limited to this numerical example, and an appropriate value can be designed and selected.

  Moreover, the control part 67 performs the conveyance control demonstrated in Example 1 as above-mentioned. Specifically, the control unit 67 adjusts the rotational speed of the base shaft driving roller 10 so that the rotational speed of the base shaft driving roller 10 becomes equal to a predetermined value VR. Further, the controller 67 varies the rotational speed of the first drive roller 11 so that the tension of the continuous paper 3 detected by the first tension detector 31 is equal to the predetermined value TL. Similarly, the rotation speed of the second drive roller 12 is varied so that the tension of the continuous paper 3 detected by the second tension detector 32 is equal to the predetermined value TH, and is detected by the third tension detector 33. The rotational speed of the third drive roller 13 is varied so that the tension of the continuous paper 3 becomes equal to the predetermined value TH. Here, the control for adjusting the rotational speed of the base shaft driving roller 10 is referred to as “adjustment control”, and the control for varying the rotational speed of the first, second, and third driving rollers is referred to as “individual control”. Distinguish from “uniform control”.

  These adjustment control and individual control are performed regardless of whether uniform control is performed. Therefore, when the tension of the continuous paper 3 in the inter-apparatus conveyance section Lm exceeds the threshold value Tth, adjustment control, individual control, and uniform control are performed in parallel. Otherwise, only adjustment control and individual control are performed.

  Comparing the above-described uniform control with the individual control, the uniform control is performed more gently than any of the individual controls. Here, “slowly” means, for example, that the dead time is set longer in the case of uniform control than in the case of individual control. Specifically, the time from when the tension of the continuous paper 3 detected by the inter-device detection unit 63 exceeds the threshold value Tth until the uniform control is started depends on the detection results of the first and second detection units. Therefore, the time until the individual control is started is made longer. Alternatively, “slowly” means, for example, that the rate of change in rotational speed is reduced in the case of uniform control compared to the case of individual control. Specifically, in the uniform control as compared with the individual control, the rotational speeds of the drive rollers 10, 11, 12, and 13 are increased or decreased slowly, gradually increased or decreased stepwise.

  As described above, according to the printing system 50 according to the second embodiment, the continuous paper 3 can be suitably conveyed in each of the printing apparatuses 1 and 51 as in the first embodiment. Accordingly, each of the printing apparatuses 1 and 51 can suitably perform printing on the continuous paper 3.

  In the second embodiment, an inter-apparatus tension detector 63 is provided. The control unit 67 in the printing apparatus 51 adjacent to the downstream side of the inter-apparatus tension detection unit 63 performs uniform control based on the detection result of the inter-apparatus tension detection unit 63. That is, the speed of the continuous paper 3 is increased or decreased uniformly without changing the tension of the continuous paper 3 in the transport sections Lu, Lp, and Ld. Thereby, even if the continuous paper 3 receives disturbance in the conveyance section Lm between apparatuses, the fluctuation | variation of the continuous paper 3 can be suppressed suitably in the printing apparatus 51. FIG.

  The control unit 67 selectively performs this uniform control. That is, the control unit 67 performs uniform control only when the tension of the continuous paper 3 in the inter-apparatus conveyance section Lm exceeds the threshold Tth, and when the tension of the continuous paper 3 in the inter-apparatus conveyance section Lm is equal to or less than the threshold Tth, the control section 67 67 does not perform uniform control.

  When the tension of the continuous paper 3 in the inter-device conveyance section Lm exceeds the threshold value Tth, it can be said that the disturbance that the continuous paper 3 receives in the inter-device conveyance section Lm is relatively large. In such a case, fluctuations in the continuous paper 3 can be effectively suppressed by performing uniform control.

  On the other hand, when the tension of the continuous paper 3 in the inter-device transport section Lm is equal to or less than the threshold Tth, it can be said that the disturbance that the continuous paper 3 receives in the inter-device transport section Lm is relatively small. In such a case, even if the uniform control is not performed, the fluctuation of the continuous paper 3 is suitably performed by the two drive rollers 10 and 12 provided on the upstream side of the printing unit 27 and the individual control by the control unit 67. Can be suppressed. Rather, by not performing uniform control, the frequency of uniform control can be reduced, and there is no possibility that the conveyance of the continuous paper 3 becomes unstable.

  Moreover, since the threshold value Tth described above is set to a relatively large value, the frequency of uniform control can be suitably reduced, and uniform control can be performed only when uniform control is effective.

  Further, the control unit 67 performs uniform control more slowly than individual control. For this reason, the frequency of the uniform control can be further reduced, or the speed of the continuous paper 3 can be prevented from changing rapidly. Therefore, more stable conveyance of the continuous paper 3 can be realized.

  On the contrary, the control unit 67 performs the individual control more quickly than the uniform control. Therefore, fluctuations in the tension of the continuous paper 3 in the transport sections Lu, Lp and Ld can be suppressed relatively quickly.

  The inter-device tension detection unit 63 is provided between the reversing unit 61 and the printing device 51. For this reason, the inter-apparatus tension detecting unit 63 can preferably detect the disturbance that the continuous paper 3 receives from the reversing unit 61.

  The present invention is not limited to the above-described embodiment, and can be modified as follows.

  (1) In each of the embodiments described above, the printing apparatuses 1 and 51 include the third drive roller 13, but the present invention is not limited thereto. That is, the third drive roller 13 may be omitted. Accordingly, the third tension detector 33 may be omitted. Even in this modification, the disturbance that the continuous paper 3 receives on the upstream side of the second drive roller 12 can be suitably suppressed, and the continuous paper 3 can be appropriately conveyed to the printing unit 27.

  (2) In each of the above-described embodiments, the printing apparatuses 1 and 51 include the four drive rollers 10, 11, 12, and 13, but the present invention is not limited thereto. That is, you may change so that five or more drive rollers may be provided.

  (3) In each of the embodiments described above, the base shaft driving roller 10 is provided as a driving roller adjacent to the upstream side of the printing unit 27, and the first driving roller 11 is provided as a driving roller adjacent to the downstream side of the printing unit 27. However, it is not limited to this. That is, the base shaft driving roller 10 may be changed to be provided as a driving roller adjacent to the downstream side of the printing unit 27. Accordingly, the first drive roller 11 may be changed to be provided as a drive roller adjacent to the upstream side of the printing unit 27.

  (4) In each of the above-described embodiments, the set value of the tension of the continuous paper 3 in the upstream transport section Lu and the downstream transport section Ld is equal to the predetermined value TH, but is not limited thereto. That is, different values may be selected as the set values of the tension of the continuous paper 3 in the upstream transport section Lu and the downstream transport section Ld.

  (5) In each of the above-described embodiments, the predetermined value VR is a set value corresponding to the rotational speed of the base shaft driving roller 10, but is not limited thereto. For example, instead of the predetermined value VR, a set value corresponding to the speed of the continuous paper 3 may be employed. The predetermined values TH and TL are set values according to the tension of the continuous paper 3 in the transport sections Lu, Lp, and Ld, but are not limited thereto. For example, you may change into the value according to the difference of the rotational speed between two adjacent drive rollers.

  (6) In each of the embodiments described above, the printing unit 27 performs printing on the continuous paper 3 by the ink jet method, and is configured by the ink jet head, but is not limited thereto. Any device that prints the continuous paper 3 in a non-contact state with the continuous paper 3 can be used as the printing unit 27. For example, examples of the substitutable printing unit include a printing unit using an appropriate configuration and method, such as electrophotography and laser beam printing.

  (7) In the above-described second embodiment, the printing system 50 includes the two printing apparatuses 1 and 51, but is not limited thereto. That is, you may change so that three or more printing apparatuses may be provided. In this case, there are two or more inter-device transport sections Lm. The inter-device tension detecting unit 63 may be provided in at least one of the inter-device transport sections Lm, or may be provided in all the inter-device transport sections Lm. Or you may comprise so that the apparatus tension | tensile_strength detection part 63 may be provided in the conveyance section Lm between apparatuses in which the inversion part 61 is installed.

  (8) In the second embodiment described above, the inter-device tension detection unit 63 is provided outside the printing device 51, but is not limited thereto. In other words, the inter-device tension detection unit 63 may be changed to be provided inside the printing device 51. In this case, it is preferable to arrange the inter-device tension detector 63 on the upstream side of the second drive roller 12.

  (9) In each of the above-described embodiments, the unwinding device 5 and the winding device 7 are exemplified as the external devices of the printing apparatus 1 and the printing system 50, but are not limited thereto. For example, a coating device or a folding machine may be provided as an external device.

DESCRIPTION OF SYMBOLS 1, 51 ... Printing device 3 ... Continuous paper 5 ... Unwinding device 7 ... Winding device 10 ... Base shaft drive roller 11 ... First drive roller 12 ... Second drive roller 13 ... Third drive roller 20 ... Nip roller (base shaft nip roller) )
21 ... Nip roller (first nip roller)
22 ... Nip roller (second nip roller)
23: Nip roller (third nip roller)
27: Printing section 31: First tension detection section (first detection section)
32 ... 2nd tension detection part (2nd detection part)
33 ... Third tension detector (third detector)
35 ... speed detection unit 37, 67 ... control unit 50 ... printing system 61 ... reversing unit 63 ... inter-device tension detection unit (inter-device detection unit)
Lu: Upstream conveying section Lp: Printing conveying section Ld: Downstream conveying section VR: Predetermined value (set constant value of rotation speed of the base shaft driving roller 10)
TL ... Predetermined value (set value of the tension of the continuous paper 3 detected by the first tension detector 31)
TH: Predetermined value (set value of the tension of the continuous paper 3 detected by the second and third predetermined values 32, 33)
Tth ... Predetermined value (threshold value of tension of continuous paper 3 detected by inter-apparatus tension detector 63)

Claims (18)

A printing device,
A printing section for printing on continuous paper in a non-contact state with continuous paper;
A base shaft driving roller that is provided on one of the upstream side or the downstream side of the printing unit and that conveys continuous paper;
A first drive roller that is provided on the other upstream or downstream side of the printing unit and that conveys continuous paper;
A second drive roller provided on the upstream side of the base shaft drive roller and the first drive roller, for conveying continuous paper;
A first detector provided between the base drive roller and the first drive roller for detecting the tension of the continuous paper;
A second detection unit that is provided upstream of the base drive roller and the first drive roller and downstream of the second drive roller, and detects a tension of the continuous paper;
A control unit that varies the rotation speed of the first drive roller based on the detection result of the first detection unit, and varies the rotation speed of the second drive roller based on the detection result of the second detection unit;
Equipped with a,
The control unit includes the first drive roller and the second drive so that the tension of the continuous paper detected by the second detection unit is higher than the tension of the continuous paper detected by the first detection unit. Printing device that controls the rollers . The printing apparatus according to claim 1 ,
A third drive roller that is provided on the downstream side of the base drive roller and the first drive roller, and that conveys continuous paper;
A third detector that is provided downstream of the base drive roller and the first drive roller and upstream of the third drive roller and detects the tension of the continuous paper;
With
The control unit is a printing device that varies a rotation speed of the third drive roller based on a detection result of the third detection unit. The printing apparatus according to claim 2 ,
The control unit is a printing apparatus that controls the third driving roller so that the tension of the continuous paper detected by the third detection unit is constant. The printing apparatus according to claim 2 or 3 ,
The control unit includes the first drive roller and the third drive so that the tension of the continuous paper detected by the third detection unit is higher than the tension of the continuous paper detected by the first detection unit. Printing device that controls the rollers. A printing device,
A printing section for printing on continuous paper in a non-contact state with continuous paper;
A base shaft driving roller that is provided on one of the upstream side or the downstream side of the printing unit and that conveys continuous paper;
A first drive roller that is provided on the other upstream or downstream side of the printing unit and that conveys continuous paper;
A second drive roller provided on the upstream side of the base shaft drive roller and the first drive roller, for conveying continuous paper;
A first detector provided between the base drive roller and the first drive roller for detecting the tension of the continuous paper;
A second detection unit that is provided upstream of the base drive roller and the first drive roller and downstream of the second drive roller, and detects a tension of the continuous paper;
A control unit that varies the rotation speed of the first drive roller based on the detection result of the first detection unit, and varies the rotation speed of the second drive roller based on the detection result of the second detection unit;
A third drive roller that is provided on the downstream side of the base shaft drive roller and the first drive roller and conveys continuous paper;
A third detector that is provided downstream of the base drive roller and the first drive roller and upstream of the third drive roller and detects the tension of the continuous paper;
Equipped with a,
The control unit varies a rotation speed of the third drive roller based on a detection result of the third detection unit,
The control unit includes the first drive roller and the third drive so that the tension of the continuous paper detected by the third detection unit is higher than the tension of the continuous paper detected by the first detection unit. Printing device that controls the rollers . The printing apparatus according to claim 5, wherein
The control unit is a printing apparatus that controls the third driving roller so that the tension of the continuous paper detected by the third detection unit is constant. The printing apparatus according to any one of claims 1 to 6 ,
The base drive roller is provided on the upstream side of the printing unit,
The first drive roller is a printing apparatus provided on the downstream side of the printing unit. The printing apparatus according to any one of claims 1 to 7 ,
The control unit controls the first driving roller so that the tension of the continuous paper detected by the first detection unit is constant, and the tension of the continuous paper detected by the second detection unit is constant. A printing apparatus for controlling the second drive roller as described above. The printing apparatus according to any one of claims 1 to 8 ,
Furthermore, a speed detection unit that is provided between the base shaft driving roller and the printing unit and detects the speed of continuous paper is provided.
The printing unit is a printing apparatus that performs printing at a timing according to a detection result of the speed detection unit. The printing apparatus according to any one of claims 1 to 9 ,
The printing unit is a printing apparatus that performs printing by an inkjet method. The printing apparatus according to any one of claims 1 to 10 ,
The control unit is a printing apparatus that adjusts a rotation speed of the base shaft driving roller to be constant. A printing system comprising a plurality of printing apparatuses according to any one of claims 1 to 11 , wherein each printing apparatus delivers continuous paper to each other and prints on continuous paper.
And an inter-device detection unit that detects the tension of the continuous paper between at least one pair of adjacent printing devices,
The control unit in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit is configured to, based on the detection result of the inter-apparatus detection unit, the base shaft driving roller, the first driving roller in the printing apparatus, and A printing system that performs uniform control to increase or decrease the rotational speeds of the second drive rollers by the same amount. The printing system according to claim 12 , wherein
The control unit in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit does not perform the uniform control when the tension of the continuous paper detected by the inter-apparatus detection unit is equal to or less than a threshold, and the apparatus A printing system that performs the uniform control when the tension of the continuous paper detected by the interval detection unit exceeds the threshold value. The printing system according to claim 12 or 13 ,
The control unit in the printing apparatus adjacent to the downstream side of the inter-device detection unit is configured to individually control the rotation speed of the first drive roller based on the detection result of the first detection unit, and the first 2. A printing system that performs the uniform control more slowly than individual control that varies the rotational speed of the second drive roller based on the detection result of the two detection units. It includes a plurality of printing devices, while passing the printing apparatus together undergo continuous sheet, in a printing system for printing on continuous paper,
The printing apparatus includes:
A printing section for printing on continuous paper in a non-contact state with continuous paper;
A base shaft driving roller that is provided on one of the upstream side or the downstream side of the printing unit and that conveys continuous paper;
A first drive roller that is provided on the other upstream or downstream side of the printing unit and that conveys continuous paper;
A second drive roller provided on the upstream side of the base shaft drive roller and the first drive roller, for conveying continuous paper;
A first detector provided between the base drive roller and the first drive roller for detecting the tension of the continuous paper;
A second detection unit that is provided upstream of the base drive roller and the first drive roller and downstream of the second drive roller, and detects a tension of the continuous paper;
A control unit that varies the rotation speed of the first drive roller based on the detection result of the first detection unit, and varies the rotation speed of the second drive roller based on the detection result of the second detection unit;
With
The printing system further includes an inter-device detection unit that detects a tension of continuous paper between at least one pair of adjacent printing devices,
The control unit in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit is configured to, based on the detection result of the inter-apparatus detection unit, the base shaft driving roller, the first driving roller in the printing apparatus, and Performing uniform control to increase or decrease the rotational speed of the second drive roller by the same amount ,
The control unit in the printing apparatus adjacent to the downstream side of the inter-device detection unit is configured to individually control the rotation speed of the first drive roller based on the detection result of the first detection unit, and the first 2. A printing system that performs the uniform control more slowly than individual control that varies the rotational speed of the second drive roller based on the detection result of the two detection units . The printing system according to claim 15 , wherein
The control unit in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit does not perform the uniform control when the tension of the continuous paper detected by the inter-apparatus detection unit is equal to or less than a threshold, and the apparatus A printing system that performs the uniform control when the tension of the continuous paper detected by the interval detection unit exceeds the threshold value. The printing system according to any one of claims 14 to 16 ,
In the case of the uniform control, the control unit in the printing apparatus adjacent to the downstream side of the inter-apparatus detection unit determines the rotational speeds of the base shaft driving roller, the first driving roller, and the second driving roller. A printing system that increases or decreases in stages. The printing system according to any one of claims 12 to 17 ,
Furthermore, it is provided between the printing devices, and includes a reversing unit that reverses the continuous paper,
The inter-device detection unit is a printing system provided between the reversing unit and the printing device adjacent to the downstream side of the reversing unit.

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