JP2009274397A - Thermal transfer printer for film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermal transfer printer for a film which can accurately hold a positional relationship of images superposed even in the case of piling printing a plurality of colors. <P>SOLUTION: In the thermal transfer printer for the film, a tension control means is provided for keeping constant a tension applied to a plastic film during superposing printing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a thermal transfer printer that prints an image on a plastic film by a thermal transfer printing method.

  In recent years, as disclosed in Patent Document 1, it has a conveying means for conveying a plastic film along a predetermined path and a holding means for holding a plurality of ink ribbons. An ink ribbon moving mechanism for moving a selected ink ribbon to a printing position arranged on the predetermined path; a print head for heating the ink ribbon moved to the printing position to print on the plastic film; and a plastic film There is known a thermal transfer printer including a platen drum that winds the tape.

  In such a thermal transfer printer, a plastic film is wound around a platen drum, the plastic film is fixed to the platen drum, and the printing position in the flow direction is defined by rotating the platen drum, and the ink ribbon is thermally printed at the printing position. The image is printed by heating with the head and transferring the ink ribbon ink onto a plastic film as the printing material. According to such a thermal transfer printer, it is not necessary to prepare a new printing plate each time a printed image is changed or modified as in the screen printing method, and a desired image can be continuously printed on a plastic film. it can.

In addition, when performing overprinting with such a thermal transfer printer, after the printing of the first image is completed, the platen drum is rotated, and the plastic film is moved again to the same printing position as the printing position of the first image. A second image different from the first image can be superimposed on the image and printed, and a plurality of colors can be printed.
JP 2005-280198 A

  However, in the printing means in which a plastic film is wound around the platen drum and the printing position in the flow direction is defined by the rotation of the platen drum, the plastic film is fixed on the platen drum, but by rotating the platen drum, The plastic film that is placed on the platen drum and the plastic film that is placed on the platen drum and the plastic film that is placed on the side that winds up the plastic film from the platen drum is tensioned. It gradually shifts from the fixed position. In particular, fluctuations in tension at the start of rotation of the platen drum are abrupt, and when printing is performed with a plurality of colors superimposed, printing overlay accuracy is reduced due to plastic film displacement caused by tension fluctuations. Further, since the plastic film shifts from the position fixed to the platen drum is random, it is not possible to improve the overlay accuracy by performing correction with a fixed correction amount.

  The present invention pays attention to such problems, and it is a main problem to provide a thermal transfer printer for a film that can maintain the positional relationship of images to be superimposed accurately even when multiple colors are overprinted. To do.

  The present invention for solving the above-mentioned problems has a conveying means for conveying a plastic film along a predetermined path and a holding means for holding a plurality of ink ribbons, and is arbitrarily selected from the plurality of ink ribbons. An ink ribbon moving mechanism for moving the ink ribbon to a printing position disposed on the predetermined path, a printing head for heating the ink ribbon moved to the printing position and printing on the plastic film, and the printing head; A platen drum which is provided at an opposing position and is capable of rotational control for accurately moving the plastic film to the overlapping printing position by winding the plastic film when performing overlapping printing, and the plastic film to the platen drum A supply roller for supplying the plus and the plus wound around the platen drum A film thermal transfer printer comprising a hoisting roller for winding a film and a plastic film fixing means for fixing the plastic film after the plastic film is wound around the platen drum. It is further characterized by further comprising tension control means for keeping the tension constant.

  Further, the tension control means may be a servo motor that controls rotation of the film supply roller and the film winding roller.

  In addition, the tension control means measures a tension applied to the plastic film provided in both the path on the side for supplying the plastic film to the platen drum and the path on the side for winding the plastic film from the platen drum. And a tension adjusting roller for adjusting the tension applied to the plastic film.

  In the invention, the tension control means is applied to the plastic film provided in both the path on the side for supplying the plastic film to the platen drum and the path on the side for winding the plastic film from the platen drum. A tension meter that measures the tension and a feedback device that feeds back the tension measured by the tension meter to the conveying means may be used.

  Further, in a state where the plastic film is fixed to the platen drum by the plastic film fixing means, before starting the rotation of the platen drum, the supply roller is rotated in the plastic film supply direction, and the winding roller is The tension applied to the plastic film may be equal to or less than a certain tension by rotating in the direction opposite to the plastic film winding direction.

  According to the present invention, since the tension control means for keeping the tension of the plastic film constant during the overprinting is provided, the tension applied to the plastic at the start of the platen drum rotation or during the rotation is always constant by the tension control means. It is possible to hold it. Therefore, it is possible to prevent the plastic film from being loosened or excessively tensioned (pulled) due to fluctuations in the tension applied to the plastic film during printing, and the plastic film from being displaced from the fixed position of the platen drum. Therefore, it is possible to accurately maintain the printing position between the images to be overlaid at the time of overprinting.

(First embodiment of the present application)
FIG. 1 is a diagram showing a main part of the thermal transfer printer for film according to the first embodiment of the present application.

  As shown in FIG. 1, a thermal transfer printer for film 1 includes a film supply roller 3 and a film winding roller 4 as conveying means for conveying a plastic film 2 along a predetermined path, and a plurality of ink ribbons R, R,. .. Holding means for holding the ink ribbon, and an ink ribbon movement for moving the ink ribbon R arbitrarily selected from the plurality of ink ribbons R, R... To a printing position arranged on the predetermined path A rotary ink ribbon unit 5 that functions as a mechanism; and a thermal head 6 as a print head that heats the ink ribbon R moved to the printing position and prints it on the plastic film 2. The platen drum 7 is provided at a position opposite to the platen drum, and the plastic film 2 is fixed on the platen drum. A pair of nip rolls 8 Kutame (supply side nip rolls), a 9 (the hoisting side nip roll), the.

  In particular, the thermal transfer printer for film 1 of the present invention is a tension control means for controlling the rotation of the film supply roller 3 and the film winding roller 4 in order to keep the tension applied to the plastic film 2 constant during overprinting. It is characterized by having a servo motor 14.

  According to the thermal transfer printer for film 1 of the present invention having such characteristics, the servo motor 14 as the tension control means controls the rotation of the film supply roller 3 and the film winding roller 4 so that the plastic film 2 is applied. The tension can be kept constant, and the plastic film 2 fixed on the outer periphery of the platen drum 7 can be prevented from being displaced from the fixed position due to the fluctuation of the tension.

  The operation of the printer 1 will be further described.

  FIG. 2 is a diagram showing a print preparation operation of the thermal transfer printer for film according to the first embodiment of the present application.

  In the printing preparation operation, as shown in FIG. 2, at the platen drum 7 origin position, the supply-side nip roll 8 and the winding-up nip roll 9 move in the direction of arrow A (platen drum side), 2 is fixed (nip). By fixing the plastic film 2 on the outer periphery of the platen drum 7 in this way, it is possible to prevent a large printing shift during printing.

  Further, after the plastic film 2 is fixed on the outer periphery of the platen drum 7 (path 23 in the case shown in FIGS. 2 to 7), the supply roller 3 is rotated in the supply direction of the plastic film 2, and the winding roller 4 Is rotated in a direction opposite to the winding direction of the plastic film 2, so that the plastic film (path 21 in the case of FIGS. 2 to 7) and the winding positioned between the supply-side nip roll 8 and the supply roller 3 are wound. The plastic film 2 is fed in advance so that the tension of the plastic film 2 (the path 22 in the case shown in FIGS. 2 to 7) positioned between the upper nip roll 9 and the hoisting roller 4 is below a certain tension. It is preferable to keep it.

  In this way, the supply roller 3 and the hoisting roller 4 are rotated to send out an extra plastic film beforehand, so that the plastic film 2 positioned in the path 21 and the plastic film positioned in the path 22 can be printed at the time of the printing start operation described later. 2 can be prevented from being suddenly pulled by the rotation of the platen drum 7 and the plastic film 2 fixed to the path 23 being displaced from the fixed position. It can be kept accurate.

  Next, the printing start movement operation of the film thermal transfer printer will be described.

  FIG. 3 is a diagram showing a print start moving operation of the thermal transfer printer for film according to the first embodiment of the present application.

  As shown in FIG. 3, first, the rotary ink ribbon unit 5 moves the ink ribbon R arbitrarily selected to the printing position. In parallel with this operation, by rotating the platen drum 7 from the origin position in the direction of arrow B, the plastic film 2 is fixed on the path 23 and moved to the print start position along a predetermined path. .

  Here, when the platen drum 7 is rotated to move the plastic film 2 to the printing start position, the plastic film 2 positioned in the path 21 and the plastic film 2 positioned in the path 22 rotate the platen drum 7. The tension of the plastic film 2 fixed on the path 23 varies from the tension during the print preparation operation, and the plastic film 2 fixed on the path 23 may deviate from the fixed position. There is. According to the first embodiment of the present application, the servo motor 14 serving as the tension control means changes the tension applied to the plastic film 2 positioned in the path 21 and the path 22 based on the fluctuation of the film supply roller 3 and the film winding. Since the rotation of the roller 4 is controlled, the tension applied to the plastic film located in the path 21 and the path 22 can be always kept constant, and the plastic film 2 fixed on the path 23 during the printing start moving operation is It is possible to prevent deviation from the fixed position.

  Here, the servo motor 14 is a motor with a built-in encoder. The tension applied to the plastic film 2 located in the path 21 and the path 22 is constantly monitored. It is possible to apply feedback to the film supply roller 3 and the film winding roller 4 so that the tension applied to the plastic film 2 positioned is constant with a single servo motor. Therefore, when an excessive tension is applied to the plastic film 2 positioned in the path 21 and the path 22 due to the rotation of the platen drum 7 or the like (when pulled), the servo motor 14 that has detected the tension variation causes The plastic film located in the path 21 and the path 22 is controlled by rotating the film supply roller 3 in the film supply direction and rotating the film winding roller 4 in the direction opposite to the film winding direction. 2 can be relaxed. Further, when the tension applied to the plastic film 2 positioned in the path 21 and the path 22 becomes weak (when it is loosened), the servo motor 14 that detects the change in the tension causes the film supply roller based on the change in the tension. 3 is rotated in the direction opposite to the film supply direction, and the film winding roller 4 is controlled to rotate in the film winding direction, whereby tension is applied to the plastic film 2 positioned in the path 21 and the path 22. As described above, when the servo motor 14 monitors the change in tension applied to the plastic film 2 located in the path 21 and the path 22 and determines that the change in tension has occurred, the rotation of the film supply roller 3 and the film winding roller 4 rotates. Therefore, the tension of the plastic film 2 positioned in the path 21 and the path 22 can be kept constant, and thereby the tension applied to the plastic film 2 fixed on the path 23 can be kept constant. Can do. As long as such an effect can be obtained, the motor for controlling the film supply roller 3 and the film winding roller 4 is not limited to the servo motor 14, and a conventionally known motor such as a stepping motor may be used. It can be appropriately selected and used.

  The printing start movement operation is completed by rotating the platen drum 7 and moving the plastic film 2 to the printing start position.

  Next, the printing operation of the film thermal transfer printer will be described.

FIG. 4A is a diagram showing the printing operation (first half) of the thermal transfer printer for film according to the first embodiment of the present application, and FIG. 4B is the thermal transfer for film according to the first embodiment of the present application. It is a figure which shows the printing operation operation | movement (late stage) of a printer.
The

  As shown in FIGS. 4A and 4B, the thermal head 6 heats the ink ribbon R selected arbitrarily while pressing it against the plastic film 2 at the printing start position, and the ink of the ink ribbon R is heated. Is transferred to the plastic film 2. The platen drum 7 located at the position facing the thermal head 6 supports the ink ribbon R and the plastic film 2 at the time of ink transfer, and rotates the platen drum 7 at a predetermined speed in the direction of arrow C, whereby an image is formed on the plastic film 2. Is printed.

  At this time, when the ink ribbon R is pressed by the thermal head 6, the plastic film 2 fixed on the path 23 does not follow the rotation of the platen drum 7 and floats between the platen drum 7 and loosens. As a result, the slackness causes printing misalignment, and the positional relationship between the superimposed images cannot be accurately maintained.

  In the present invention, such a problem is also taken into consideration, and the fluctuation of the tension applied to the plastic film 2 positioned in the path 21 and the path 22 is monitored by the servo motor 14 as the tension control means during the printing operation. When it is determined that the tension has fluctuated, the tension applied to the plastic film 2 positioned in the path 21 and the path 22 is controlled to be constant by controlling the rotation of the film supply roller 3 and the film winding roller 4. . Thereby, the tension of the plastic film 2 fixed on the path 23 can always be kept constant, and the plastic film located in the path 23 can be prevented from being loosened during the printing operation. Thus, the servo motor 14 as the tension control means controls the plastic film 2 fixed on the path 23 by controlling the tension applied to the plastic film 2 positioned in the path 21 and the path 22 to be constant. The tension can be kept constant, and the accuracy of printing misalignment at the time of overlapping printing can be ± 0.1 mm to 0.05 mm, and the positional relationship between the overlapping images can be accurately maintained.

  In the printing operation, when the platen drum 7 is rotated and the plastic film 2 is moved to the end position of the first printing range, the first printing operation is completed.

  Next, the printing end operation will be described.

  FIG. 5 is a diagram illustrating a printing end operation of the thermal transfer printer for film according to the first embodiment of the present application.

  As shown in FIG. 5, when the platen drum 7 finishes the printing operation in the first printing range, the platen drum 7 rotates in the direction of arrow B (the direction opposite to the printing direction) to perform the origin return. At this time, the tension applied to the plastic film 2 fixed on the path 23 varies from the tension controlled to be constant in the printing operation. Even in this case, the servo motor 14 monitors the variation in tension applied to the plastic film 2 located in the path 21 and the path 22, and when it is determined that the variation in tension has occurred, the film supply roller 3 and the film winding roller 4 It is preferable to control the supply and winding of the plastic film 2 so that the tension applied to the plastic film 2 fixed on the path 23 by controlling the rotation is the same as the tension controlled in the printing operation.

  For example, when the ink is transferred a plurality of times to the same printing range, such as when printing an image in color, the platen drum 7 rotates in the direction of arrow B after the first printing to the first printing range is completed. After returning to the origin, the plastic film 2 is conveyed to the printing start position shown in FIG. Along with this operation, the ink ribbon unit 5 moves the ink ribbon R different from the ink ribbon R used in the first printing to the printing position. Thereafter, the ink can be transferred to the same printing range a plurality of times by sequentially performing the processes of FIGS. 2 to 5 until the desired printing is completed.

  According to the thermal transfer printer 1 for a film in the first embodiment of the present application described above, the supply roller 3 so that the tension of the plastic film 2 positioned in the path 21 and the path 22 is equal to or less than a certain tension in the print preparation operation. Then, by rotating the hoisting roller 4 and feeding out the plastic film 2 in advance, the plastic film 2 positioned in the path 21 and the plastic film 2 positioned in the path 22 are rotated by the rotation of the platen drum 7 during the printing start operation. It is possible to prevent the plastic film that is pulled suddenly and fixed on the path 23 from being displaced from the fixed position. The servo motor 14 monitors the tension applied to the plastic film 2 located in the path 21 and the path 22, and when it is determined that the tension has changed, the change in the tension is fed back to the film supply roller 3 and the film winding roller 4. By rotating the film supply roller 3 and the film winding roller 4, the tension applied to the plastic film 2 fixed on the path 23 is always constant in the printing start movement operation, the printing operation operation, and the printing end operation. Can be held. As a result, it is possible to completely prevent printing misalignment that occurs when printing is performed a plurality of times in the same printing range in a state where the tension applied to the plastic film 2 fixed on the path 23 is not constant.

(Second embodiment of the present application)
FIG. 6 is a diagram illustrating a main part of the thermal transfer printer for film 20 according to the second embodiment of the present application.

  As shown in FIG. 6, the second embodiment of the present application is a film thermal transfer printer according to the first embodiment of the present invention shown in FIG. 1 in the path (path 21) on the side of supplying the plastic film to the platen drum. The tension meter 12 and the supply-side tension adjustment roller 10 are characterized in that the tension meter 12 and the winding-side tension adjustment roller 11 are provided in a path (path 22) on the side of winding the plastic film 2 from the platen drum 7. The other common parts constituting the film thermal transfer printer are denoted by the same reference numerals, and description thereof is omitted. Each operation state (print preparation operation, print start movement operation, print operation operation, and print end operation) is the same as the above-described operation, and detailed description thereof is omitted.

  The tension meter 12 is used for measuring the tension applied to the plastic film 2, and a conventionally known tension meter is appropriately selected and used as long as the tension applied to the plastic film 2 can be measured. be able to.

  Further, the position where the tension meter 12 is installed is not particularly limited. However, in the present invention, the plastic film 2 fixed on the path 23 by holding the tension applied to the plastic film 2 positioned in the path 21 and the path 22 constant. Can be prevented from fluctuating from a fixed position. In consideration of such points, the tension meter 12 is respectively provided on the path 21 and the path 22 so as to measure the tension applied to the plastic film 2 positioned in the path 21 and the plastic film 2 positioned in the path 22 as shown in the drawing. It is preferable to be provided.

  Further, in the plastic film conveyance path, a supply side tension adjustment roller 10 and a winding side tension adjustment roller 11 are provided to keep the tension of the plastic film 2 positioned on the paths 21 and 22 constant. The supply side tension adjustment roller 10 and the winding side tension adjustment roller 11 are rollers that can move in the conveyance path, and move in a predetermined direction when the tension applied to the plastic film 2 located in the path 21 and the path 22 fluctuates. The tension applied to the plastic film 2 located in the path 21 and the path 22 is held constant.

  Specifically, the supply-side tension adjusting roller 10 reduces the tension when an excessive tension is applied to the plastic film 2 positioned in the path 21 during each operation (an arrow in the case of FIG. 6). E direction), and when the tension applied to the plastic film 2 located in the path 21 is weakened, it moves in the direction in which the tension is applied (in the case of FIG. 6, the direction of the arrow F). Further, the winding-up tension adjusting roller 11 moves in the direction of relaxing the tension (in the direction of arrow E in the case of FIG. 6) when an excessive tension is applied to the plastic film 2 positioned in the path 22. When the tension applied to the plastic film 2 positioned at 22 is weakened, the plastic film 2 moves in the direction in which the tension is applied (in the direction of arrow F in the case of FIG. 6). Thus, the tension applied to the plastic film 2 located in the path 21 and the path 22 can be kept constant by moving the supply side tension adjustment roller 10 and the winding side tension adjustment roller 11 based on the fluctuation of the tension. The tension applied to the plastic film 2 fixed on the path 23 can be kept constant. Thereby, the accuracy of printing misalignment during overprinting can be set to ± 0.1 mm to 0.05 mm, and the positional relationship between the overlaid images can be maintained with high accuracy.

  The movement direction of the supply side tension adjustment roller 10 and the winding side tension adjustment roller 11 is not limited to the above-mentioned direction, and the movement direction is particularly limited as long as the tension applied to the plastic film 2 can be controlled. There is no limitation. Alternatively, the tension applied to the plastic film 2 positioned in the path 21 and the path 22 may be controlled by rotating the supply side tension adjustment roller 10 and the winding side tension adjustment roller 11.

  Means for moving the supply-side tension adjustment roller 10 and the winding-side tension adjustment roller 11 are not particularly limited, and can be appropriately moved by driving a conventionally known motor or the like, for example, a servo motor or a stepping motor. Etc. Further, when it is determined that the tension measured by the tension meter 12 has fluctuated from a predetermined tension, correction information for correcting the fluctuation is calculated, and the calculated correction information is used as the supply-side tension adjustment roller 10 and the winding-side tension adjustment roller. 11 may be provided with a feedback device (not shown) that feeds back to 11.

(Third embodiment of the present application)
FIG. 7 is a view showing a main part of the thermal transfer printer 30 for film according to the third embodiment of the present application.

  In the third embodiment of the present application, the tension meter 12 for measuring the tension of the plastic film located in the path 21 and the path 22 in the thermal transfer printer for film according to the first embodiment of the present application shown in FIG. The other features of the thermal transfer printer for film 30 are given the same reference numerals, and the description thereof is omitted. . Each operation state (print preparation operation, print start movement operation, print operation operation, and print end operation) is the same as the above-described operation, and detailed description thereof is omitted.

  As shown in FIG. 7, the film thermal transfer printer 30 is provided with a tension meter 12 as a tension control means and a feedback device 13. The tension meter 12 is the same as the tension meter 12 described above, and detailed description thereof is omitted.

  As shown in the figure, the feedback device 13 is connected to the tension meter 12 and receives the tension measured by the tension meter 12, and corrects the changed tension when it is determined that the received tension has changed from a predetermined tension. It is provided for calculating information and feeding back the correction information to the supply roller 3 and the hoisting roller 4.

  The feedback device 13 is not particularly limited as long as the above effects can be achieved, and a conventionally known device can be appropriately selected and used. An example of such a feedback device 13 is a step roller. Since the tension meter 12 is built in the fulcrum shaft of the step roller, it is not necessary to provide the tension meter 12 separately.

  The supply roller 3 and the hoisting roller 4 that have received the correction information from the feedback device 13 control the plastic film supply and hoisting based on the correction information, so that the plastic located in the path 21 and the path 22 is controlled. The tension applied to the film 2 can be kept constant, and the plastic film 2 fixed on the path 23 can be prevented from shifting from the fixed position.

  According to the thermal transfer printer for film 30 described above, the tension meter 12 measures the tension of the plastic film 2 located in the path 21 and the plastic film 2 located in the path 22, and tension control means based on the measured tension. The feedback device 13 calculates correction information for keeping the tension constant, and feeds back the correction information to the supply roller 3 and the hoisting roller 4. The supply roller 3 and the hoisting roller 4 that have received the correction information from the feedback device 13 control the supply of the plastic film and the hoisting based on the correction information, so that the plastic film 2 positioned in the path 21 and the path 22 is changed. Such tension can be kept constant, the plastic film 2 fixed on the path 23 can be prevented from being displaced from the fixed position, and printing misalignment that occurs when printing is repeated a plurality of times can be prevented. And the positional relationship between the superimposed images can be accurately maintained.

It is a figure which shows the principal part of the thermal transfer printer for films which concerns on 1st embodiment of this application. It is a figure which shows the printing preparation operation | movement of the thermal transfer printer for films which concerns on 1st embodiment of this application. It is a figure which shows the printing start movement operation | movement of the thermal transfer printer for films which concerns on 1st embodiment of this application. It is a figure which shows the printing operation | movement operation | movement of the thermal transfer printer for films which concerns on 1st embodiment of this application. It is a figure which shows the printing completion | finish operation | movement of the thermal transfer printer for films which concerns on 1st embodiment of this application. It is a figure which shows the principal part of the thermal transfer printer for films based on 2nd embodiment of this application. It is a figure which shows the principal part of the thermal transfer printer for films based on 3rd embodiment of this application.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 20, 30 ... Thermal transfer printer for films 2 ... Plastic film 3 ... Supply roller 4 ... Winding roller 5 ... Rotary ink ribbon unit 6 ... Thermal head 7 ... Platen drum 8 ... Supply nip roll 9 ... Upper nip roll 10 ... Supply tension adjustment roller 11 ... Upward tension adjustment roller 12 ... Tension meter 13 ... Feedback device 14 ... Servomotor

Claims (5)

A conveying unit configured to convey the plastic film along a predetermined path; and a holding unit configured to hold a plurality of ink ribbons, and an ink ribbon arbitrarily selected from the plurality of ink ribbons is disposed on the predetermined path. An ink ribbon moving mechanism for moving the ink ribbon to the print position, a print head for heating the ink ribbon moved to the print position to print on the plastic film, and a position facing the print head, and performing overprinting A platen drum capable of rotational control for accurately moving the plastic film to the overprinting position by winding the plastic film, a supply roller for supplying the plastic film to the platen drum, and a platen drum A hoisting roller for hoisting the wound plastic film; A thermal transfer printer for film with a plastic film fixing means for performing fixing of the plastic film after winding the plastic film serial platen drum,
A thermal transfer printer for a film, further comprising tension control means for maintaining a constant tension applied to the plastic film during overprinting.   2. The thermal transfer printer for film according to claim 1, wherein the tension control means is a servo motor that controls the rotation of the film supply roller and the film winding roller.   A tension meter for measuring tension applied to the plastic film provided in both the path on the side of supplying the plastic film to the platen drum and the path on the side of winding the plastic film from the platen drum; 2. The thermal transfer printer for film according to claim 1, wherein the thermal transfer printer is a tension adjusting roller for adjusting a tension applied to the plastic film.   A tension meter for measuring the tension applied to the plastic film provided in both the path on the side for supplying the plastic film to the platen drum and the path on the side for winding the plastic film from the platen drum; The thermal transfer printer for film according to claim 1, wherein the thermal transfer printer is a feedback device that feeds back the tension measured by the tension meter to the conveying unit. In the state where the plastic film is fixed to the platen drum by the plastic film fixing means,
Before starting the rotation of the platen drum, the supply roller is rotated in the plastic film supply direction, and the winding roller is rotated in the direction opposite to the plastic film winding direction, so that the tension applied to the plastic film is increased. The thermal transfer printer for film according to any one of claims 1 to 4, wherein the tension is not more than a certain tension.

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