JP2010208323A - Printing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing system which includes a plurality of printing units and can convey a recording medium film at high speed. <P>SOLUTION: A printing system 10 includes a conveying line 14 which has a film supply part 11 and a film winding part 12 and conveys a recording medium film 13, and printing units 15, 16, 17, and 18 which are arranged along the conveying line 14 in turn from the film supply part 11 side and perform printing on the recording medium film 13. The conveying line has a pair of third conveying rollers 27a and 27a for conveying the recording medium film 13 between a fourth printing unit 18 and the film winding part 12, and a third tension detecting part 27b for detecting the tension applied to the recording medium film 13 in the pair of third conveying rollers 27a and 27a. The drive of the pair of third conveying rollers 27a and 27a is controlled by a control part 30 from the signal from the third tension detecting part 27b so that the tension applied to the recording medium film 13 may be constant. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a printing system including a conveyance line and a plurality of printing units that are arranged along the conveyance line and perform printing on a recording medium film.

  Conventionally, a printing system including a plurality of printing units has been used as one of means for printing a color image or the like on a recording medium film. Each printing unit includes an ink ribbon supply unit, an ink ribbon winding portion, a recording head, and a platen roll, and is arranged along a conveyance line of the printing system.

  Further, a conveyance roller for conveying the recording medium film is provided in the vicinity of each printing unit in the conveyance line, and the recording medium film on the conveyance line is sequentially conveyed by each conveyance roller. While the recording medium film is sequentially conveyed by the respective conveying rollers, printing is sequentially performed on the recording medium film by each printing unit, whereby a color image is printed on the recording medium film.

  In order to appropriately and sequentially print on the recording medium film by each printing unit, it is necessary to match the conveyance speed of the recording medium film on each conveyance roller. However, since the roller diameters of the respective transport rollers are different due to manufacturing errors, even if the rotational speeds of the respective transport rollers are matched, the transport speeds of the recording medium films on the respective transport rollers are completely matched. It was difficult.

  In order to solve such a problem, the non-volatile storage means for storing the rotational driving conditions of the respective transport rollers for which the transport speed of the recording medium film in each transport roller is the same, and the non-volatile storage means stored therein There has been proposed a printer including a control unit that rotationally drives each transport roller according to a rotational driving condition (see Patent Document 1).

JP 2006-198834 A

  However, in the prior art shown in Patent Document 1, a stepping motor is used as a driving mechanism for each transport roller, and therefore the recording medium film is transported at a predetermined pitch by each transport roller. In this case, since the recording medium film is conveyed at a predetermined pitch by a conveying roller having a stepping motor, even if the recording medium film is caught, the conveying operation is maintained. The tension applied to the printing unit may vary between the printing units. In this case, it is conceivable that the recording medium film is stepped out between the printing units, thereby causing a positional shift between printed images applied to the recording medium film by each printing unit. .

  The present invention has been made in consideration of such points, and the position of the print image applied to the recording medium film by each printing unit is matched with high accuracy, and the recording medium film is moved at high speed. It is an object of the present invention to provide a printing system that can be transported.

  The present invention includes a film supply unit and a film winding unit, each having a transport line for transporting a recording medium film, an ink ribbon supply unit, an ink ribbon winding unit, a recording head, and a platen roll. A plurality of printing units that are arranged along the transport line in order from the supply unit side and perform printing on the recording medium film, and the film supply unit includes a supply roller that supplies the recording medium film to the transport line. The film winding unit has a winding roller for winding the recording medium film from the conveying line, and the conveying line is configured to transfer the recording medium film between at least the final printing unit and the film winding unit. A take-up-side transport roller for transporting, and a take-up-side tension detecting unit for detecting a tension applied to the recording medium film in the take-up-side transport roller. The winding side transport roller is driven and controlled by the control unit based on a signal from the corresponding winding side tension detection unit so that the tension of the recording medium film becomes constant. It is.

  In the present invention, the conveyance line is applied to the recording medium film between the film supply unit and the first printing unit, the supply-side conveyance roller that conveys the recording medium film, and the supply-side conveyance roller. A supply-side tension detection unit that detects the tension, and the supply-side transport roller is driven by the control unit based on a signal from the corresponding supply-side tension detection unit so that the tension of the recording medium film becomes constant. A printing system that is controlled.

  In the present invention, the conveyance line is applied to the recording medium film between the pair of adjacent printing units among the plurality of printing units, the intermediate conveyance roller that conveys the recording medium film, and the intermediate conveyance roller. An intermediate tension detecting unit for detecting the tension of the recording medium, and the intermediate transport roller is driven and controlled by the control unit so that the tension of the recording medium film becomes constant based on a signal from the corresponding intermediate tension detecting unit. A printing system.

  The present invention is a printing system in which the winding-side transport roller, the supply-side transport roller, and the intermediate transport roller are each driven by a corresponding servo motor.

  In the present invention, the conveyance line includes an intermediate conveyance roller that conveys a recording medium film between any pair of adjacent printing units among the plurality of printing units, and the intermediate conveyance roller includes the intermediate conveyance roller. The printing system is characterized in that it is driven and controlled by a control section so that the recording medium film conveyance speed in the recording medium is constant.

  The present invention is a printing system in which the supply roller and the take-up roller are driven by corresponding vector inverter motors, respectively.

  In the present invention, a supply roller tension detection unit that detects the tension applied to the recording medium film in the supply roller is provided in the vicinity of the supply roller, and the supply roller is based on a signal from the supply roller tension detection unit. A winding roller tension detecting unit that is driven and controlled by the control unit so that the tension of the recording medium film is constant and detects the tension applied to the recording medium film at the winding roller in the vicinity of the winding roller. And the winding roller is driven and controlled by the control unit so that the tension of the recording medium film becomes constant based on a signal from the winding roller tension detection unit. .

  The present invention is a printing system further comprising a meandering prevention system for preventing a recording medium film conveyed by a conveying line from meandering.

  According to the present invention, the winding-side conveyance roller is driven and controlled by the control unit so that the tension of the recording medium film becomes constant based on the signal from the corresponding winding-side tension detection unit. For this reason, the recording medium film does not step out between the printing units, and thereby the positions of the print images applied to the recording medium film by the printing units are matched with high accuracy. The recording medium film can be conveyed at high speed.

FIG. 1 is a diagram illustrating a printing system according to a first embodiment of the present invention. FIG. 2 is a block diagram showing a control method by a control unit in the first embodiment of the present invention. FIG. 3 is a diagram showing a printing system according to the second embodiment of the present invention. FIG. 4 is a block diagram showing a control method by a control unit in the second embodiment of the present invention. FIG. 5A is a diagram showing the conveyance speed in each printing unit in the second embodiment of the present invention, and FIG. 5B is a diagram showing the conveyance speed in each printing unit in the comparative example.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

1 and 2 are diagrams showing an embodiment of a printing system according to the present invention.
Here, FIG. 1 is a diagram illustrating the entire printing system in the present embodiment, and FIG. 2 is a diagram illustrating a control method by the control unit in the present embodiment.

  First, the entire printing system 10 will be described. As shown in FIG. 1, the printing system 10 includes a film supply unit 11 and a film winding unit 12, and includes a conveyance line 14 that conveys a recording medium film 13 and a conveyance line 14 in order from the film supply unit 11 side. A plurality of, for example, four printing units (a first printing unit 15, a second printing unit 16, a third printing unit 17, and a fourth printing unit 18) for printing on the recording medium film 13 are arranged. I have. In the present embodiment, the printing units 15, 16, 17, and 18 are for printing cyan, magenta, yellow, and black inks on the recording medium film 13, respectively.

  Among them, the first printing unit 15 includes a first ink ribbon supply unit 15a, a first ink ribbon winding upper part 15b for winding up the first ink ribbon 15e supplied from the first ink ribbon supply unit 15a, and a first ink ribbon 15e. A first recording head 15c that presses the ink on the recording medium film 13, and a first platen roll 15d that sandwiches the first ink ribbon 15e and the recording medium film 13 between the first recording head 15c. is doing. Similarly, the second printing unit 16 includes a second ink ribbon supply unit 16a, a second ink ribbon winding portion 16b, a second recording head 16c, and a second platen roll 16d. The third printing unit 17 also includes a third ink ribbon supply unit 17a, a third ink ribbon winding portion 17b, a third recording head 17c, and a third platen roll 17d. The fourth printing unit 18 also includes a fourth ink ribbon supply unit 18a, a fourth ink ribbon winding portion 18b, a fourth recording head 18c, and a fourth platen roll 18d.

  The film supply unit 11 includes a supply roller 21 that supplies the recording medium film 13 to the conveyance line 14, and the film winding unit 12 includes a winding roller 22 that winds the recording medium film 13 from the conveyance line. Have. Among these, the supply roller 21 is driven by a first vector inverter motor 21a as shown in FIG. 2, and this first vector inverter motor 21a is controlled by a control unit 30, whereby the tension of the recording medium film 13 is increased. The torque and speed of the supply roller 21 are adjusted so as to be constant. Similarly, the take-up roller 22 is driven by a second vector inverter motor 22a, and the second vector inverter motor 22a is also controlled by the control unit 30 so that the tension of the recording medium film 13 becomes constant. The torque and speed of the winding roller 22 are adjusted.

  In this case, the control unit 30 makes the tension of the recording medium film 13 at the supply roller 21 and the take-up roller 22 constant from the magnitude of the current passed through the first vector inverter motor 21a and the second vector inverter motor 22a. Thus, the first vector inverter motor 21a and the second vector inverter motor 22a are controlled.

  Next, a roller for conveying the recording medium film 13 from the film supply unit 11 side toward the film winding unit 12 side will be described.

  The transport line 14 includes a pair of first transport rollers (supply-side transport rollers) 23 a and 23 a that transport the recording medium film 13 between the film supply unit 11 and the first printing unit 15, and the pair of first A first tension detection unit (supply side tension detection unit) 23b that is provided in the vicinity of the conveyance rollers 23a and 23a and detects the tension applied to the recording medium film 13 by the pair of first conveyance rollers 23a and 23a; is doing. In the pair of first transport rollers 23a and 23a, the tension applied to the recording medium film 13 in the pair of first transport rollers 23a and 23a is constant based on a signal from the first tension detector 23b. The drive is controlled by the controller 30. Specifically, as shown in FIG. 2, the pair of first transport rollers 23a and 23a are driven by a first servo motor (supply side servo motor) 23c, and the first servo motor 23c has a first tension. The controller 30 is controlled based on a signal from the detector 23b.

  Of these, the first tension detector 23 b has a columnar shape extending in the width direction of the recording medium film 13, and the first tension detector 23 b is disposed in contact with the recording medium film 13. The first tension detector 23b abuts the recording medium film 13 at a constant pressure, and detects the position where the first tension detector 23b and the recording medium film 13 are in contact, that is, the amount of movement of the first tension detector 23b. The tension applied to the recording medium film 13 is detected based on the amount of movement of the first tension detector 23b.

  The transport line 14 further includes a pair of second transports that transport the recording medium film 13 between the second printing unit 16 and the third printing unit 17 that are adjacent to each other among the four printing units 15, 16, 17, and 18. Rollers (intermediate transport rollers) 25a and 25a and a pair of second transport rollers 25a and 25a are provided in the vicinity of the pair of second transport rollers 25a and 25a, and the tension applied to the recording medium film 13 is detected. And a second tension detector (intermediate tension detector) 25b. Also in this case, as in the case of the pair of first transport rollers 23a and 23a, the pair of second transport rollers 25a and 25a are driven by a second servo motor (intermediate servo motor) 25c, and the second servo motor 25c. Is controlled by the control unit 30 based on a signal from the second tension detection unit 25b so that the tension applied to the recording medium film 13 at the pair of second transport rollers 25a and 25a is constant.

  In addition, the transport line 14 includes a pair of third transport rollers (winding side transport rollers) 27 a and 27 a that transport the recording medium film 13 between the fourth printing unit 18 and the film winding unit 12, A third tension detector (winding side tension detection) that is provided in the vicinity of the pair of third transport rollers 27a, 27a and detects the tension applied to the recording medium film 13 at the pair of third transport rollers 27a, 27a. Part) 27b. In this case as well, as in the case of the pair of first transport rollers 23a and 23a, the pair of third transport rollers 27a and 27a are driven by a third servo motor (winding side servo motor) 27c, and this third servo The motor 27c is controlled by the control unit 30 based on a signal from the third tension detection unit 27b so that the tension applied to the recording medium film 13 at the pair of third transport rollers 27a and 27a is constant. .

  In the transport line 14, a pair of first guide rollers 31, 31 that guide the recording medium film 13 are provided before and after the first printing unit 15. 2nd guide rollers 32 and 32 are provided. Further, a pair of third guide rollers 33 and 33 are provided in front of and behind the second tension detection unit 25b and the pair of second transport rollers 25a and 25a, and a pair of fourth guide rollers in the front and rear of the third printing unit 17. 34 and 34 are provided, and a pair of fifth guide rollers 35 and 35 are provided before and after the fourth printing unit 18.

  Next, the operation of the present embodiment having such a configuration will be described with reference to FIGS.

  First, as shown in FIG. 1, a supply roller 21 of a film supply unit 11 around which a recording medium film 13 is wound is prepared, and a front end portion (not shown) of the recording medium film 13 is connected to a first transport roller 23 a, a first Guide roller 31, first printing unit 15, second guide roller 32, second printing unit 16, third guide roller 33, second transport roller 25a, fourth guide roller 34, third printing unit 17, and fifth guide roller 35, the fourth printing unit 18, and the third transport roller 27 a are sequentially passed to the winding roller 22 of the film winding unit 12, and the leading end of the recording medium film 13 is fixed to the winding roller 22.

  On the other hand, in the printing units 15, 16, 17, and 18, ink ribbon supply units 15a, 16a, 17a, and 18a around which the ink ribbons 15e, 16e, 17e, and 18e are wound are prepared, and the ink ribbons 15e, 16e, 17e, and 18e is fed between the recording heads 15c, 16c, 17c, 18c and the platen rolls 15d, 16d, 17d, 18d to the ink ribbon winding upper portions 15b, 16b, 17b, 18b, and the ink ribbon 15e, The tip portions of 16e, 17e, and 18e are fixed to the ink ribbon winding upper portions 15b, 16b, 17b, and 18b.

  Next, as shown in FIG. 1, the recording medium film 13 is sequentially sent to the first printing unit 15, the second printing unit 16, the third printing unit 17, and the fourth printing unit 18. At this time, first, between the first recording head 15c and the first platen roll 15d of the first printing unit 15, the first ink ribbon 15e is applied to the recording medium film 13, and the side on which the ink is applied is the recording medium. It is overlaid so as to face the film 13. Next, the first ink ribbon 15e is heated and pressed against the recording medium film 13 between the first recording head 15c and the first platen roll 15d, whereby the ink on the first ink ribbon 15e is transferred to the recording medium. The film 13 is thermocompression bonded. Thereafter, the first ink ribbon 15e, on which the ink is thermocompression bonded to the recording medium film 13, is wound up by the first ink ribbon winding upper portion 15b. In this way, a cyan image is printed on the recording medium film 13 in the first printing unit 15.

  Next, the recording medium film 13 is sent to the second printing unit 16. Also in this case, the ink of the second ink ribbon 16 e is thermocompression bonded to the recording medium film 13 by the same process as that of the first printing unit 15. As a result, a magenta image is printed on the recording medium film 13. Thereafter, the recording medium film 13 is sent to the third printing unit 17 and the fourth printing unit 18, and the ink of the third ink ribbon 17 e and the fourth ink ribbon 18 e is thermocompression bonded to the recording medium film 13. As a result, yellow and black images are printed on the recording medium film 13. In this way, an image composed of cyan, magenta, yellow, and black inks is printed on the recording medium film 13.

  The recording medium film 13 on which the image is printed is then wound up by the winding roller 22 of the film winding unit 12.

  During this time, that is, while the four printing units 15, 16, 17, and 18 are printing on the recording medium film 13, the recording medium film 13 fed by the supply roller 21 of the film supply unit 11 is conveyed. The film is transported by a pair of first transport rollers 23a and 23a, a pair of second transport rollers 25a and 25a, and a pair of third transport rollers 27a and 27a, and is wound by the wind roller 22 of the film winder 12. .

  In this case, first, the supply roller 21 of the film supply unit 11 is driven by the first vector inverter motor 21a so that the tension of the recording medium film 13 in the supply roller 21 becomes a desired value. At this time, the control unit 30 controls the current passed through the first vector inverter motor 21a so that the tension of the recording medium film 13 on the supply roller 21 becomes a desired value in consideration of the dimensions of the supply roller 21 and the like. To do.

  Further, the pair of first transport rollers 23a and 23a downstream of the supply roller 21 has a first servo motor so that the tension applied to the recording medium film 13 at the pair of first transport rollers 23a and 23a is constant. It is driven by 23c. At this time, the control unit 30 controls the current supplied to the first servomotor 23c so that the tension of the recording medium film 13 is constant based on the signal from the first tension detection unit 23b. In this way, the control unit 30 finely adjusts the torque of the pair of first transport rollers 23a and 23a via the first servo motor 23c so that the tension applied to the recording medium film 13 is constant. Can do.

  In addition, the pair of second transport rollers 25a and 25a downstream of the first transport roller 23a is configured so that the tension applied to the recording medium film 13 at the pair of second transport rollers 25a and 25a is constant. It is driven by a servo motor 25c. At this time, the control unit 30 controls the current supplied to the second servomotor 25c based on the signal from the second tension detection unit 25b so that the tension of the recording medium film 13 becomes constant.

  The pair of third transport rollers 27a and 27a downstream of the second transport roller 25a also has a third tension so that the tension applied to the recording medium film 13 at the pair of third transport rollers 27a and 27a is constant. It is driven by a servo motor 27c. At this time, the control unit 30 controls the current supplied to the third servomotor 27c so that the tension of the recording medium film 13 becomes constant based on the signal from the third tension detection unit 27b.

  Finally, the take-up roller 22 of the film take-up unit 12 downstream of the third transport roller 27a has the second vector inverter motor 22a so that the tension of the recording medium film 13 at the take-up roller 22 becomes a desired value. It is driven by. At this time, the control unit 30 considers the dimensions of the take-up roller 22 and the like, and the current passed through the second vector inverter motor 22a so that the tension of the recording medium film 13 at the take-up roller 22 becomes a desired value. To control.

  As described above, according to the present embodiment, the printing system 10 includes the film supply unit 11 and the film winding unit 12, the conveyance line 14 that conveys the recording medium film 13, the plurality of printing units 15, 16, 17, and 18. The conveyance line 14 includes a pair of third conveyance rollers 27 a and 27 a that convey the recording medium film 13 between the fourth printing unit 18 and the film winding unit 12, and a recording medium in the third conveyance roller 27 a. A third tension detector 27b that detects the tension applied to the film 13; The pair of third transport rollers 27a and 27a is driven and controlled by the control unit 30 so that the tension of the recording medium film 13 becomes constant based on a signal from the third tension detection unit 27b. In this manner, the pair of third transport rollers 27a and 27a are driven and controlled by the control unit 30 so that the tension applied to the recording medium film 13 in the third transport roller 27a is always constant. As a result, the recording medium film 13 does not step out between the printing units 15, 16, 17, and 18. In addition, the position of the print image applied can be matched with high accuracy, and the recording medium film 13 can be conveyed at high speed.

  Further, according to the present embodiment, the transport line 14 of the printing system 10 includes the pair of first transport rollers 23 a and 23 a that transport the recording medium film 13 between the film supply unit 11 and the first printing unit 15. And a first tension detector 23b that detects the tension applied to the recording medium film 13 in the first transport roller 23a, and the transport line 14 further includes a second print unit 16 and a second A pair of second transport rollers 25a and 25a that transport the recording medium film 13 between the three printing units 17, and a second tension that detects the tension applied to the recording medium film 13 at the second transport roller 25a. And a detector 25b. The pair of first transport rollers 23a, 23a and the pair of second transport rollers 25a, 25a are controlled so that the tension applied to the recording medium film 13 at each transport roller 23a, 25a is always constant. The drive is controlled by 30. As a result, the recording medium film 13 does not step out between the printing units 15, 16, 17, and 18. In addition, the position of the printed image applied can be matched with high accuracy, and the recording medium film 13 can be conveyed at a higher speed.

  Furthermore, according to the present embodiment, the respective transport rollers 23a, 25a, 27a are driven by the corresponding servo motors 23c, 25c, 27c. Accordingly, the control unit 30 finely adjusts the torque of each of the transport rollers 23a, 25a, and 27a via the servo motors 23c, 25c, and 27c so that the tension applied to the recording medium film 13 is constant. Can do.

  Moreover, according to this Embodiment, the supply roller 21 of the film supply part 11 and the winding roller 22 of the film winding part 12 are driven by the corresponding vector inverter motors 21a and 22a, respectively. At this time, the control unit 30 controls each vector inverter motor so that the tension of the recording medium film 13 at the supply roller 21 and the take-up roller 22 is constant based on the magnitude of the current flowing through the vector inverter motors 21a and 22a. 21a and 22a are controlled. For this reason, the tension of the recording medium film 13 in the supply roller 21 and the take-up roller 22 can be made constant.

  In the present embodiment, an example is shown in which the printing system 10 is provided with four printing units 15, 16, 17, and 18. However, the present invention is not limited to this, and the printing system 10 can include an arbitrary number of printing units depending on the type of ink printed on the recording medium film 13.

  In the present embodiment, a pair of second transport rollers 25 a and 25 a that transport the recording medium film 13 between the adjacent second printing unit 16 and the third printing unit 17, and the recording medium film 13. The example in which the 2nd tension | tensile_strength detection part 25b which detects the applied tension | tensile_strength is provided was shown. However, the present invention is not limited to this, and the conveyance line 14 can have a pair of conveyance rollers and a tension detection unit between any adjacent printing units.

  Further, in the present embodiment, an example in which the tension of the recording medium film 13 is detected by each of the tension detection units 23b, 25b, and 27b in contact with the recording medium film 13 is shown. However, the present invention is not limited to this, and the tension detection units 23b, 25b, and 27b do not bring the tension detection units 23b, 25b, and 27b into contact with the recording medium film 13, and the tension of the recording medium film 13 can be reduced. May be detected. For example, each tension detector 23b, 25b, 27b may detect the tension of the recording medium film 13 by observing the surface state of the recording medium film 13 with electromagnetic waves.

  Moreover, in this Embodiment, each conveyance roller 23a, 25a, 27a showed the example driven by corresponding servomotor 23c, 25c, 27c. However, the present invention is not limited to this, and each of the transport rollers 23a, 25a, and 27a may be driven by a corresponding vector inverter motor (not shown). In this case, the control unit 30 sets the corresponding vector inverter motor so that the tension of the recording medium film 13 at each of the transport rollers 23a, 25a, and 27a is constant based on the magnitude of the current passed through the corresponding vector inverter motor. Control. For this reason, the tension detectors 23b, 25b, and 27b are not necessary, and the cost of the printing system 10 can be reduced.

  Moreover, in this Embodiment, the supply roller 21 of the film supply part 11 and the winding roller 22 of the film winding part 12 showed the example driven by the corresponding vector inverter motors 21a and 22a, respectively. However, the present invention is not limited to this, and the supply roller 21 and the take-up roller 22 correspond to corresponding servo motors (not shown) based on signals from corresponding tension detection units (not shown) provided in the vicinity. ).

  In the present embodiment, the first tension detection unit 23b, the second tension detection unit 25b, and the third tension detection unit 27b are respectively upstream of the first conveyance roller 23a, the second conveyance roller 25a, and the third conveyance roller 27a. The example provided on the side is shown. However, the present invention is not limited to this, and each tension detector 23b, 25b, 27b may be provided in the vicinity of the corresponding transport roller 23a, 25a, 27a.

  In the present embodiment, the printing system 10 may further include a meandering prevention system (not shown) that prevents the recording medium film 13 conveyed by the conveying line 14 from meandering.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. 3 to 5A. In the second embodiment shown in FIG. 3 to FIG. 5A, the intermediate conveyance roller of the conveyance line is driven and controlled by the control unit so that the conveyance speed of the recording medium film on the intermediate conveyance roller is constant. . In the second embodiment shown in FIG. 3 to FIG. 5A, the same parts as those in the first embodiment shown in FIG. 1 and FIG.

The printing system 10A in the present embodiment provides a printing system capable of conveying a recording medium film at high speed, similarly to the printing system 10 in the first embodiment shown in FIGS. It is structured as a purpose.
In a conventional printer in which a stepping motor is used as a drive mechanism for each transport roller, it is conceivable that the stepping motor will step out when the recording medium film is transported at a high speed. When a step-out occurs in a specific stepping motor, it is conceivable that a deviation occurs between the transport speed of the recording medium film in one printing unit and the transport speed of the recording medium film in another printing unit. The deviation in the transport speed of the recording medium film between the printing units means that the period of the printing process performed in each printing unit is different between the printing units. For this reason, it is considered that the density of printing performed on a predetermined area of the recording medium film differs among printing units. For this reason, in a conventional printer in which a stepping motor is used as a driving mechanism for each transport roller, the recording medium film is generally transported at a low speed so as to prevent step-out.
According to the present embodiment, as in the printing system 10 in the first embodiment shown in FIGS. 1 and 2, the pair of third transport rollers 27a and 27a receives signals from the third tension detector 27b. Based on this, drive control is performed by the control unit 30 so that the tension of the recording medium film 13 becomes constant. For this reason, even when the recording medium film 13 is conveyed at high speed, the step-out does not occur. Thus, density unevenness can be suppressed and the recording medium film 13 can be conveyed at high speed.
Further, according to the present embodiment, as will be described later, the pair of second transport rollers 25a and 25a (intermediate transport rollers) controls the transport speed of the recording medium film 13 on the intermediate transport roller 25a to be constant. The drive is controlled by 30. Thereby, as will be described later, density unevenness can be further suppressed.

  Hereinafter, the printing system 10A according to the second embodiment of the present invention will be described with reference to FIGS. 3 to 5A. FIG. 3 is a diagram illustrating the entire printing system in the present embodiment, and FIG. 4 is a diagram illustrating a control method by the control unit in the present embodiment. FIG. 5A is a diagram illustrating the conveyance speed in each printing unit in the second embodiment of the present invention.

Printing System As shown in FIG. 3, the printing system 10 </ b> A has a film supply unit 11 and a film take-up unit 12, and conveys the recording medium film 13 in order from the film supply unit 11 side. A plurality of, for example, four printing units (first printing unit 15, second printing unit 16, third printing unit 17, fourth printing unit 18) arranged along the line 14 and performing printing on the recording medium film 13. ). Since each printing unit 15, 16, 17, 18 is the same as each printing unit 15, 16, 17, 18 in 1st Embodiment shown in FIG. 1 and FIG. 2, detailed description is abbreviate | omitted.

Film Supply Unit First, the film supply unit 11 will be described. As shown in FIG. 3, the film supply unit 11 has a supply roller 21 for supplying the recording medium film 13 to the transport line 14, and this supply roller 21 is driven by a first vector inverter motor 21a. . As shown in FIG. 3, a supply roller tension detector 21 b that detects the tension applied to the recording medium film 13 in the supply roller 21 is provided near the downstream side of the supply roller 21. Then, as shown in FIG. 4, the first vector inverter motor 21a is controlled by the control unit 30 so that the tension of the recording medium film 13 in the supply roller 21 becomes constant based on the signal from the supply roller tension detection unit 21b. Has been.

  The supply roller tension detector 21b detects the tension applied to the recording medium film 13 by a so-called pickup method, and as shown in FIG. 3, a pair of guides 21f and 21f, a pair of guides 21f, And a pickup roll 21e provided between 21f.

Film Winding Unit Next, the film winding unit 12 will be described. As shown in FIG. 3, the film winding unit 12 has a winding roller 22 that winds the recording medium film 13 from the transport line 14, and this winding roller 22 is driven by a second vector inverter motor 22a. Driven. As shown in FIG. 3, a winding roller tension detector 22 b that detects the tension applied to the recording medium film 13 at the winding roller 22 is provided near the upstream side of the winding roller 22. Then, as shown in FIG. 4, the second vector inverter motor 22a has a control unit 30 based on a signal from the take-up roller tension detection unit 22b so that the tension of the recording medium film 13 on the take-up roller 22 becomes constant. It is controlled by.

  The take-up roller tension detector 22b detects the tension applied to the recording medium film 13 by a so-called pickup method, and as shown in FIG. 3, a pair of guides 22f and 22f and a pair of guides 22f. , 22f, and a pickup roll 22e.

  The supply roller tension detection unit 21b and the take-up roller tension detection unit 22b are not limited to the pickup type tension detector, but may be various types such as a dancer type detector that detects the tension based on the position of the dancer roll. Various types of tension detectors can be used as appropriate.

  Next, a roller for conveying the recording medium film 13 from the film supply unit 11 side toward the film winding unit 12 side will be described.

First transport roller (supply-side transport roller)
The transport line 14 includes a pair of first transport rollers (supply-side transport rollers) 23 a and 23 a that transport the recording medium film 13 between the film supply unit 11 and the first printing unit 15, and the pair of first A first tension detector (supply-side tension detector) 23b that is provided near the downstream side of the transport rollers 23a and 23a and detects the tension applied to the recording medium film 13 at the pair of first transport rollers 23a and 23a. And have. In the pair of first transport rollers 23a and 23a, the tension applied to the recording medium film 13 in the pair of first transport rollers 23a and 23a is constant based on a signal from the first tension detector 23b. The drive is controlled by the controller 30. Specifically, as shown in FIG. 4, the pair of first transport rollers 23a and 23a is driven by a supply-side vector inverter motor 23d, and the supply-side vector inverter motor 23d is supplied from the first tension detection unit 23b. Is controlled by the control unit 30 based on this signal.

  The first tension detector 23b detects the tension applied to the recording medium film 13 by a so-called pickup method, and as shown in FIG. 3, a pair of guides 23f, 23f, a pair of guides 23f, And a pickup roll 23e provided between 23f.

Third transport roller (winding side transport roller)
In addition, the transport line 14 includes a pair of third transport rollers (winding-side transport rollers) 27 a and 27 a that transport the recording medium film 13 between the fourth printing unit 18 and the film winding unit 12, A third tension detection unit (winding side tension detection unit) that is provided in the vicinity of the pair of third conveyance rollers 27a and 27a and detects the tension applied to the recording medium film 13 at the pair of third conveyance rollers 27a and 27a. 27b. In the pair of third transport rollers 27a and 27a, the tension applied to the recording medium film 13 in the pair of third transport rollers 27a and 27a is constant based on a signal from the third tension detection unit 27b. The drive is controlled by the controller 30. Specifically, as shown in FIG. 4, the pair of third transport rollers 27a and 27a are driven by a winding-side vector inverter motor 27d, and the winding-side vector inverter motor 27d has a third tension detecting unit. It is controlled by the control unit 30 based on the signal from 27b.

  The third tension detector 27b detects the tension applied to the recording medium film 13 by a so-called pickup method. As shown in FIG. 3, the pair of guides 27f and 27f, the pair of guides 27f, And a pickup roll 27e provided between 27f.

  The first tension detection unit 23b and the third tension detection unit 27b are not limited to the pickup type tension detector, but may be various types such as a dancer type detector that detects the tension based on the position of the dancer roll. Any type of tension detector may be used as appropriate.

Second transport roller (intermediate transport roller)
The transport line 14 further includes a pair of second transports that transport the recording medium film 13 between the second printing unit 16 and the third printing unit 17 that are adjacent to each other among the four printing units 15, 16, 17, and 18. Rotational speed detection that is provided in the vicinity of the rollers (intermediate transport rollers) 25a and 25a and the pair of second transport rollers 25a and 25a and detects the rotational speed per unit time of the pair of second transport rollers 25a and 25a Part 25e. The pair of second transport rollers 25a and 25a is driven and controlled by the control unit 30 so that the transport speed of the recording medium film 13 in the intermediate transport rollers 25a and 25a is constant. Specifically, as shown in FIG. 4, the pair of second transport rollers 25a and 25a is driven by an intermediate vector inverter motor 27d, and the intermediate vector inverter motor 25d receives a signal from the rotation speed detection unit 25e. Based on this, the controller 30 controls the rotation speed of the intermediate transport rollers 25a and 25a per unit time to be constant.

The method for detecting the rotation number per unit time of the second transport roller 25a by the rotation number detection unit 25e is not particularly limited, and the rotation number per unit time of the second transport roller 25a is detected by a known method. Can do.
In addition, although the example in which the rotation speed detection unit 25e is provided in the vicinity of the second transport roller 25a has been shown, the present invention is not limited thereto, and the rotation speed detection unit 25e is built in the intermediate vector inverter motor 25d. Also good.
Moreover, although the example provided with the rotation speed detection part 25e which detects the rotation speed per unit time of the 2nd conveyance roller 25a was shown, it is not restricted to this, For example, the rotation speed of the 2nd conveyance roller 25a When the ratio between the rotational speed of the intermediate vector inverter motor 25d is always constant, a rotational speed detection unit that detects the rotational speed per unit time of the intermediate vector inverter motor 25d may be provided. In this case, the intermediate vector inverter motor 25d is controlled by the control unit 30 based on a signal from the rotation number detection unit so that the rotation number per unit time of the intermediate vector inverter motor 25d is constant.

  In addition, an example is shown in which the conveyance speed of the recording medium film 13 in the intermediate conveyance roller 25a is made constant by controlling the second conveyance roller 25a or the intermediate vector inverter motor 25d to have a constant rotation speed per unit time. However, it is not limited to this. For example, a speed detector that directly detects the transport speed of the recording medium film 13 on the intermediate transport roller 25a is provided in the vicinity of the intermediate transport roller 25a, and the transport speed of the recording medium film 13 is based on a signal from the speed detector. The intermediate conveyance rollers 25a and 25 may be driven and controlled by the control unit 30 so that is constant.

  In addition, the holding angle of the recording medium film 13 with respect to each of the pair of first transport rollers 23a and 23a, the pair of second transport rollers 25a and 25a, and the pair of third transport rollers 27a and 27a is defined. One roller 23a, 25a, 27a (the roller 23a, 25a, 27a disposed on the lower side in FIG. 3) is made of metal, and the other roller 23a, 25a, 27a (the upper roller in FIG. 3 is disposed on the upper side). The rollers 23a, 25a, 27a) may be made of rubber.

  In the printing system 10 </ b> A, as described above, the supply roller 21, the take-up roller 22, the pair of first transport rollers 23 a and 23 a, and the pair of third transport rollers 27 a and 27 a are applied to the recording medium film 13. Are controlled by the control unit 30 so as to be constant. On the other hand, the pair of second transport rollers 25 a and 25 a are driven and controlled by the control unit 30 so that the transport speed of the recording medium film 13 is constant. For this reason, in the conveyance line 14 of the printing system 10 </ b> A, the reference conveyance speed is determined by the pair of second conveyance rollers 25 a and 25 a. In this case, the supply roller 21, the take-up roller 22, the pair of first transport rollers 23a and 23a, and the pair of third transport rollers 27a and 27a transport the recording medium film 13 on the pair of second transport rollers 25a and 25a. Under the condition that the speed is constant, the controller 30 controls the drive so that the tension applied to the recording medium film 13 at each roller is constant. For this reason, as will be described later, density unevenness can be further suppressed as compared to the case where the pair of second transport rollers 25a and 25a are not driven and controlled at a constant speed.

  Next, the operation of the present embodiment having such a configuration will be described with reference to FIGS. 3 to 5A.

  First, as shown in FIG. 3, a supply roller 21 of a film supply unit 11 around which a recording medium film 13 is wound is prepared, and a front end portion (not shown) of the recording medium film 13 is connected to a first transport roller 23 a, a first one. Guide roller 31, first printing unit 15, second guide roller 32, second printing unit 16, third guide roller 33, second transport roller 25a, fourth guide roller 34, third printing unit 17, and fifth guide roller 35, the fourth printing unit 18, and the third transport roller 27 a are sequentially passed to the winding roller 22 of the film winding unit 12, and the leading end of the recording medium film 13 is fixed to the winding roller 22.

  On the other hand, in the printing units 15, 16, 17, and 18, ink ribbon supply units 15a, 16a, 17a, and 18a around which the ink ribbons 15e, 16e, 17e, and 18e are wound are prepared, and the ink ribbons 15e, 16e, 17e, and 18e is fed between the recording heads 15c, 16c, 17c, 18c and the platen rolls 15d, 16d, 17d, 18d to the ink ribbon winding upper portions 15b, 16b, 17b, 18b, and the ink ribbon 15e, The tip portions of 16e, 17e, and 18e are fixed to the ink ribbon winding upper portions 15b, 16b, 17b, and 18b.

  Next, the recording medium film 13 is transported along the transport line 14. At this time, as described above, the conveyance speed of the recording medium film 13 between the pair of second conveyance rollers 25 a and 25 a becomes the reference of the conveyance speed of the recording medium film 13 in the entire conveyance line 14.

  The pair of second transport rollers 25a and 25a are driven and controlled by the control unit 30 so that the transport speed V of the recording medium film 13 on the second transport roller 25a is, for example, 5 m / min. Specifically, in consideration of the diameter of the second transport roller 25a, the intermediate vector inverter motor 25d or the second transport is performed so that the transport speed V of the recording medium film 13 on the second transport roller 25a becomes the above value. The number of rotations per unit time of the roller 25a is controlled by the control unit 30.

  On the other hand, the supply roller 21, the take-up roller 22, the pair of first transport rollers 23a and 23a, and the pair of third transport rollers 27a and 27a are controlled so that the tension applied to the recording medium film 13 is constant. Each unit 30 is driven and controlled. In this way, the recording medium film 13 is conveyed from the supply roller 21 toward the take-up roller 22.

  The recording medium film 13 is sequentially sent to the first printing unit 15, the second printing unit 16, the third printing unit 17, and the fourth printing unit 18. In each of the printing units 15, 16, 17, and 18, images made of cyan, magenta, yellow, and black inks are printed on the recording medium film 13, respectively. The recording medium film 13 on which the image is printed is then wound up by the winding roller 22 of the film winding unit 12.

  By the way, the density of the image printed in each printing unit depends on the heating temperature of the ink ribbon in each printing unit and the period of the printing process performed in each printing unit (the recording medium film 13 in each printing unit). It is thought that it also depends on the staying time. That is, it can be said that the density of the image printed in each printing unit depends on the conveyance speed of the recording medium film 13 when passing through each printing unit. For this reason, in order to suppress unevenness in image density between the printing units, the transport speed V of the recording medium film 13 when passing through each printing unit is within a predetermined range, for example, within a range of V ± ΔV. It will be important to do this.

Hereinafter, the conveyance speed of the recording medium film 13 in each printing unit 15, 16, 17, 18 will be described with reference to FIG. In the present embodiment, as described above, the conveyance speed of the recording medium film 13 on the second conveyance roller 25a is V. On the other hand, as described above, the pair of first transport rollers 23 a and 23 a are driven and controlled by the control unit 30 so that the tension applied to the recording medium film 13 is constant.
Heat is applied to the recording medium film 13 from the first printing unit 15 or the second printing unit 16 between the first conveying roller 23a and the second conveying roller 25a. For this reason, it is considered that the recording medium film 13 expands and contracts due to heat between the first transport roller 23a and the second transport roller 25a. On the other hand, the pair of first transport rollers 23a and 23a are driven and controlled by the control unit 30 so that the tension applied to the recording medium film 13 is constant even when such expansion and contraction occurs. . For this reason, the conveyance speed of the recording medium film 13 in the first conveyance roller 23a and the conveyance speed of the recording medium film 13 in the printing units 15 and 16 are different from the conveyance speed V in the second conveyance roller 25a by a predetermined amount. It is possible that

That is, when the transport speed of the recording medium film 13 in the second printing unit 16 and v _2, due to such expansion and contraction of the recording medium film 13 between the first conveying roller 23a~ second conveying roller 25a, second the conveying speed v ₂ in the printing unit 16, it is conceivable that differ by the conveyance speed V and the predetermined amount in the second conveyance roller 25a. The difference amount in this case is Δv ₂ (see FIG. 5A).

Also, when the transport speed of the recording medium film 13 in the first printing unit 15 and v _1, due to such expansion and contraction of the recording medium film 13 between the first conveying roller 23a~ second conveying roller 25a, the first It is conceivable that the conveyance speed v ₁ in the printing unit 15 is also different from the conveyance speed v ₂ in the second printing unit 16 by a predetermined amount. The difference amount in this case is Δv ₁ (see FIG. 5A).

The conveying speed _{v 1} in the first printing unit 15, consider the displacement of the conveying speed V of the second conveying roller 25a. As described above, the conveyance speed v ₁ in the first printing unit 15 is different from the conveyance speed v ₂ in the second printing unit 16 by Δv ₁ . Further, the conveying speed _{v 2} of the second printing unit 16 is different only Delta] v ₂ relative to the conveying velocity V in the second conveying roller 25a. For this reason, it can be said that the conveyance speed v ₁ in the first printing unit 15 is cumulatively different from the conveyance speed V in the second conveyance roller 25 a by Δv ₁ + Δv ₂ at the maximum.

In the present embodiment, as described above, the conveyance speed of the recording medium film 13 on the second conveyance roller 25a is V, while the pair of third conveyance rollers 27a and 27a is a recording medium. The drive is controlled by the control unit 30 so that the tension applied to the film 13 is constant. Therefore, when the transport speed of the recording medium film 13 in the third printing unit 17, v _3, as in the second printing unit 16, the recording medium between the second conveying roller 25a~ third conveying roller 27a due to such expansion and contraction of the film 13, the transport velocity v ₃ of the third printing unit 17, it is conceivable that differ by the conveyance speed V and the predetermined amount in the second conveyance roller 25a. The amount of difference in this case is Δv ₃ (see FIG. 5A).

In addition, when the transport speed of the recording medium film 13 in the fourth printing unit 15 is v4, the _fourth speed is caused by the expansion and contraction of the recording medium film 13 between the second transport roller 25a and the third transport roller 27a. It is conceivable that the conveyance speed v ₄ in the printing unit 18 is also different from the conveyance speed v ₃ in the third printing unit 17 by a predetermined amount. The amount of difference in this case is Δv ₄ (see FIG. 5A).

The conveying speed _{v 4} of the fourth printing unit 18, consider the displacement of the conveying speed V of the second conveying roller 25a. As described above, the conveyance speed v ₄ in the fourth printing unit 18 is different from the conveyance speed v ₃ in the third printing unit 17 by Δv ₄ . The transport velocity _{v 3} of the third printing unit 17 is different only Delta] v ₃ to the conveying speed V of the second conveying roller 25a. For this reason, it can be said that the conveyance speed v ₄ in the fourth printing unit 18 is cumulatively different from the conveyance speed V in the second conveyance roller 25 a by Δv ₃ + Δv ₄ at the maximum.

In summary, in the present embodiment, the conveyance speed of the recording medium film 13 in each of the printing units 15, 16, 17, and 18 with respect to the conveyance speed V of the recording medium film 13 in the second conveyance roller 25 a. Are different from each other by Δv ₁ + Δv ₂ , Δv ₂ , Δv ₃ , Δv ₃ + Δv _{4 at the} maximum.

Next, as a comparative example, the third transport roller 27a is drive-controlled so that the transport speed V is constant, while the first transport roller 23a and the second transport roller 25a are drive-controlled so that the tension is constant. (See FIG. 5B). In this case, the conveyance speed v ₄ of the fourth printing unit 18 is considered to be approximately equal to the conveying speed V of the third conveying roller 27a. On the other hand, as is apparent from FIG. 5B, the conveyance speed v ₁ in the first printing unit 15 is cumulative by Δv ₁ + Δv ₂ + Δv ₃ + Δv _{4 at} maximum with respect to the conveyance speed V in the third conveyance roller 27a. It can be said that they are different. For this reason, it is conceivable that the conveyance speed v ₁ in the first printing unit 15 deviates from V ± ΔV, which is the above-described preferable range. For this reason, there is a concern that unevenness occurs in the density of the image printed on the recording medium film 13.

On the other hand, according to the present embodiment, a pair of second units provided between the second printing unit 16 and the third printing unit 17 that are adjacent to each other among the four printing units 15, 16, 17, 18. The transport rollers 25 a and 25 a are driven and controlled by the control unit 30 at a constant speed. For this reason, the deviation between the conveyance speed in each of the printing units 15, 16, 17, and 18 and the conveyance speed V in the second conveyance roller 25a can be suppressed to Δv ₁ + Δv ₂ or Δv ₃ + Δv ₄ at the maximum. . Thereby, it is possible to further reduce the possibility that the conveyance speed in each of the printing units 15, 16, 17, and 18 deviates from V ± ΔV, which is the preferred range described above. Thereby, the density unevenness of the image printed on the recording medium film 13 can be further suppressed.

  In the present embodiment, an example in which a pair of second transport rollers 25a and 25a that are driven and controlled at a constant speed is provided between the adjacent second printing unit 16 and the third printing unit 17 is shown. . However, the present invention is not limited to this, and a pair of second transport rollers 25a and 25a that are driven and controlled at a constant speed can be provided between any adjacent printing units.

  In the present embodiment, the pair of second transport rollers 25a and 25a is driven and controlled by the control unit 30 so that the transport speed V of the recording medium film 13 on the second transport roller 25a is 5 m / min. showed that. However, the present invention is not limited to this, and the conveyance speed V of the recording medium film 13 on the second conveyance roller 25a is appropriately determined according to the characteristics of the printing units 15, 16, 17, 18 and the recording medium film 13. Can be set. According to the present embodiment, as described above, the pair of second transport rollers 25a and 25a that are driven and controlled to transport the recording medium film 13 at a constant speed, and the recording medium film 13 with a constant tension. By combining the pair of third transport rollers 27a and 27a that are driven and controlled to transport, the recording medium film 13 can be transported at high speed without causing density unevenness. In this case, the recording medium film 13 can be conveyed at a high speed, for example, at a speed in the range of 2 to 10 m / min.

DESCRIPTION OF SYMBOLS 10 Printing system 10A Printing system 11 Film supply part 12 Film winding part 13 Recording medium film 14 Conveyance line 15 1st printing unit 15a 1st ink ribbon supply part 15b 1st ink ribbon winding upper part 15c 1st recording head 15d 1st Platen roll 15e First ink ribbon 16 Second printing unit 16a Second ink ribbon supply unit 16b Second ink ribbon winding upper part 16c Second recording head 16d Second platen roll 16e Second ink ribbon 17 Third printing unit 17a Third ink Ribbon supply portion 17b Third ink ribbon winding portion 17c Third recording head 17d Third platen roll 17e Third ink ribbon 18 Fourth printing unit 18a Fourth ink ribbon supply portion 18b Fourth ink ribbon winding portion 18c Fourth recording head 18d 4th platen 18e Fourth ink ribbon 21 Supply roller 21a First vector inverter motor 21b Supply roller tension detector 21e Pickup roll 21f Guide 22 Take-up roller 22a Second vector inverter motor 22b Take-up roller tension detector 22e Pickup roll 22f Guide 23a 1st conveyance roller 23b 1st tension detection part 23c 1st servomotor 23d Supply side vector inverter motor 23e Pickup roll 23f Guide 25a 2nd conveyance roller 25b 2nd tension detection part 25c 2nd servomotor 25d Intermediate vector inverter motor 25e Number of rotations Detection unit 27a Third transport roller 27b Third tension detection unit 27c Third servo motor 27d Winding side vector inverter motor 27e Pickup roll 27f Guide 30 Control unit 31 first guide roller 32 and the second guide roller 33 the third guide roller 34 fourth guide roller 35 fifth guide roller

Claims (8)

A conveyance line that has a film supply unit and a film winding unit, and conveys a recording medium film;
A plurality of printing units each having an ink ribbon supply unit, an ink ribbon winding unit, a recording head, and a platen roll, arranged in order from the film supply unit side along the conveyance line, and printing on a recording medium film; With
The film supply unit has a supply roller for supplying a recording medium film to the conveyance line,
The film winding unit has a winding roller for winding the recording medium film from the transport line,
The conveyance line includes a winding-side conveyance roller that conveys the recording medium film between at least the final printing unit and the film winding unit, and a tension applied to the recording medium film at the winding-side conveyance roller. A winding side tension detection unit for detecting
The printing system is characterized in that the winding-side transport roller is driven and controlled by the control unit based on a signal from the corresponding winding-side tension detection unit so that the tension of the recording medium film becomes constant. The conveyance line detects a tension applied to the recording medium film at the supply-side conveyance roller and a supply-side conveyance roller that conveys the recording medium film between the film supply unit and the first printing unit. A supply side tension detector,
The supply side transport roller is driven and controlled by the control unit so that the tension of the recording medium film becomes constant based on a signal from a corresponding supply side tension detection unit. Printing system. The conveyance line detects an intermediate conveyance roller that conveys a recording medium film between any pair of adjacent printing units among a plurality of printing units, and a tension applied to the recording medium film at the intermediate conveyance roller. An intermediate tension detector
3. The drive of the intermediate transport roller is controlled by the control unit so that the tension of the recording medium film becomes constant based on a signal from the corresponding intermediate tension detection unit. The printing system according to any one of the above.   4. The printing system according to claim 1, wherein the winding-side transport roller, the supply-side transport roller, and the intermediate transport roller are each driven by a corresponding servo motor. The conveyance line has an intermediate conveyance roller for conveying the recording medium film between any pair of adjacent printing units among the plurality of printing units,
The printing system according to claim 1, wherein the intermediate conveyance roller is driven and controlled by a control unit so that a conveyance speed of the recording medium film on the intermediate conveyance roller is constant. .   6. The printing system according to claim 1, wherein the supply roller and the take-up roller are each driven by a corresponding vector inverter motor. In the vicinity of the supply roller, a supply roller tension detection unit for detecting the tension applied to the recording medium film at the supply roller is provided, and the supply roller is recorded based on a signal from the supply roller tension detection unit. The drive is controlled by the control unit so that the tension of the media film is constant,
In the vicinity of the winding roller, a winding roller tension detection unit that detects the tension applied to the recording medium film in the winding roller is provided, and the winding roller receives a signal from the winding roller tension detection unit. 7. The printing system according to claim 1, wherein the printing system is driven and controlled by the control unit so that the tension of the recording medium film becomes constant.   The printing system according to any one of claims 1 to 7, further comprising a meandering prevention system for preventing the recording medium film conveyed by the conveying line from meandering.

Images