JPH09169147A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a printer having good printing quality and being adapted to an ink sheet having a wide width capable of always stably conveying an ink sheet of which back tension is set roughly the same from beginning to ending of the winding of the ink sheet by a method wherein a rotational resistance applied to an ink sheet supply reel is adjusted even when the back tension is varied being caused by the change of a winding diameter. SOLUTION: The title device comprises a movable ink sheet guide 14 that guides an ink sheet 3 in a supplying passage and a rotatable tension lever 15 that supports the movable ink sheet guide 14. Even when a winding diameter of an ink sheet supply reel becomes small and a back tension thereof temporarily becomes greater, the movable ink sheet guide 14 is pulled by the ink sheet 3, the tension lever 15 is rotated and a brake pad 16 that moves being fixed to the tension lever 15 acts such that a rotational resistance applied to the ink supply reel 5 is rendered small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer device for printing information or the like on printing paper, and more particularly to a thermal transfer printer device for printing using a thermal head and an ink sheet.

[0002]

2. Description of the Related Art In recent years, in a thermal transfer type printer device for sequentially printing on a printing paper by using a color ink sheet and a thermal head to which three colors of yellow, magenta, and cyan are sequentially applied, a printer of high printing quality is provided. The demand for equipment is increasing.

FIG. 12 is a side view showing a conventional printer device disclosed in, for example, Japanese Patent Laid-Open No. 2-143881. In the figure, 1 is a thermal head having a heating resistor, 2 is a roller-shaped platen which is a counterpart member of the thermal head 1, and 3 is a base film whose surface is coated with heat-melting or heat-subliming ink. Ink sheet, 4
Is a printing paper for transferring and fixing the ink, 5 is an ink sheet supply reel for storing the unused ink sheet 3 in a roll, and 6 is an ink sheet winding for winding the ink sheet 3 after recording in a roll A take-up reel, 7 is a supply-side ink sheet guide for guiding the ink sheet 3 in the supply path to the thermal head 1, 8 is a peeling member for peeling the ink sheet 3 after passing the thermal head 1 from the printing paper 4, and 9 is Capstan rollers 10 that are drive rollers that convey the printing paper 4 are pinch rollers that are driven rollers that are provided so as to face the capstan roller 9.

Next, the operation will be described. The conventional printer device is configured as described above. For example, as shown in FIG. 12, first, the printing paper 4 is fed to the capstan roller 9 and the pinch roller 10 by a feeding mechanism (not shown).
It is transported to the position where it is sandwiched between. From here, the printing paper 4 is conveyed by the capstan roller 9 and the pinch roller 10 in the direction of the arrow in the figure, and when the printing start position of the printing paper reaches the position of the heating resistor of the thermal head 1, the capstan roller 9 The rotation is stopped and the conveyance of the printing paper 4 is also stopped (hereinafter referred to as “printing paper cueing”). At the same time, the ink sheet take-up reel 6 rotates in the direction of the arrow to wind up the ink sheet 3, and when the printing start position of the ink sheet 3 reaches the position of the heating resistor of the thermal head 1, the ink sheet 3 is taken up. Stop (hereinafter referred to as “ink sheet cueing”).

Next, the thermal head 1 standing by above the platen 2 descends and comes into pressure contact with the platen 2 with the first color (eg yellow) ink sheet 3 and the printing paper 4 interposed therebetween. In this state, the heating resistor of the thermal head 1 is selectively heated to melt or sublime the first color ink applied to the surface of the ink sheet 3 and fix it on the printing paper 4 to form an image.

At this time, the capstan roller 9 rotates to convey the printing paper 4 in the direction of the arrow in the figure, and the ink sheet take-up reel 6 also rotates in the direction of the arrow to run the ink sheet. The ink sheet 3 after passing through the thermal head 1 is peeled off from the printing paper 4 by the ink sheet peeling member 8 and wound up. The ink sheets wound on the ink sheet take-up reel 6 are sequentially supplied from the ink sheet supply reel 5. The ink sheet supply reel 5 is always provided with a constant rotation resistance by a rotation resistance providing means (not shown).
The ink sheet 3 immediately before passing through is supplied from the ink sheet supply reel 5 while maintaining a certain tension.

When the printing for one screen is completed, the thermal head 1 releases the pressure contact with the platen 2 and waits upward.
The capstan roller 9 rotates in the direction opposite to that at the time of printing, the printing paper 4 is conveyed in the direction opposite to the arrow in the figure, and the printing paper 4 is fed again. During this time, the ink sheet take-up reel 6 is also rotated to wind up the first color ink sheet 3 and cue the second color ink sheet. After that, the thermal head 1 is pressed against the platen 2 again, and the printing of the second color (for example, magenta) is performed in the same process as the first color. In this way, the printing operation is repeated in sequence for the third color (for example, cyan) and, if necessary, for the fourth color (for example, black), and a color image is formed by overlapping the colors.

Finally, in a state where the thermal head 1 releases the pressure contact with the platen 2 and waits upward, the printing paper 4 is further conveyed by the capstan roller 9 in the direction of the arrow and discharged outside the apparatus.

[0009]

However, in the conventional printer device as described above, in order to apply tension to the ink sheet 3 immediately before passing through the thermal head 1, the ink sheet supply reel 5 is provided with a rotational resistance of a constant torque. Rotational resistance applying means is provided, but as the winding diameter of the ink sheet supply reel 5 changes, the ink sheet tension (hereinafter, referred to as back tension) immediately before passing through the thermal head 1 also changes, so the back tension is changed. It is difficult to keep the ink sheet supply reel 5 within an appropriate range from the beginning to the end of winding. When the tension is insufficient, defective transfer such as wrinkling of the ink sheet due to slack of the ink sheet 3, and when the tension is excessive. There have been problems such as color misregistration when a large number of colors are overlaid.

The present invention has been made to solve the above-mentioned problems, and the ink sheet supply reel 5 is provided.
Even if the back tension changes due to the change in the winding diameter of the ink, by adjusting the rotation resistance applied to the ink sheet supply reel 5 according to the detected back tension,
It is an object of the present invention to obtain a printer device having a high print quality that does not cause defective transfer of the ink sheet or color misregistration, in which the back tension is almost constant from the beginning to the end of the winding of the ink sheet 3, and the ink sheet 3 can always run stably. is there.

[0011]

A printer device according to the present invention includes a back tension detecting means provided in an ink sheet supply path for detecting a back tension, and a rotation resistance for an ink sheet supply reel. It is provided with a rotation resistance applying means for applying and releasing.

A brake drum connected to the ink sheet supply reel via a rotation transmission system, an ink sheet guide for guiding the ink sheet in the supply path, and one side or both sides of the ink sheet guide are supported and rotated. A movable tension lever, a tension spring for urging the tension lever so that the ink sheet guide moves in a direction to pull the ink sheet, and a tension spring connected to the tension lever via a power transmission system to rotate to the brake drum. And a rotation resistance applying means for applying and releasing resistance.

A brake drum connected to the ink sheet supply reel via a rotation transmission system, an ink sheet guide for guiding the ink sheet in the supply path, and one side or both sides of the ink sheet guide are supported and rotated. A movable tension lever, a tension spring that urges the tension lever so that the ink sheet guide moves in the direction in which the ink sheet is pulled, and a tension resistance that is fixed to the tension lever to impart and release rotational resistance to the brake drum. And a rotation resistance applying means for performing the rotation resistance.

A brake pad is used as a rotation resistance applying means for applying and releasing a rotation resistance to the brake drum.

A brake belt is used as a rotation resistance applying means for applying and releasing rotation resistance to the brake drum.

Further, a speed increasing means for speeding up the rotation of the ink sheet supply reel is provided in the path of the power transmission system between the ink sheet supply reel and the brake drum.

Further, two tension levers are arranged on both sides of the ink sheet, and a synchronizing member is provided to bridge two tension levers on both sides for synchronization.

Further, a stop member for stopping the rotation of the tension lever is provided at a position where the tension lever rotates and the rotation resistance applying means releases the contact with the brake drum.

Also, variable rotation resistance applying means for adjusting the magnitude of rotation resistance applied to the ink sheet supply reel in accordance with the back tension, and constant rotation resistance applying means for applying a constant rotation resistance to the ink sheet supply reel at all times. And are provided at the same time.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION In the printer device according to the embodiment of the present invention, the magnitude of the rotational resistance applied to the ink sheet supply reel is adjusted in accordance with the magnitude of the back tension detected by the back tension detecting means. As a result, the back tension can be kept substantially constant from the beginning to the end of winding the ink sheet.

Further, even if the winding diameter of the ink sheet supply reel becomes small and the back tension temporarily increases,
The ink sheet guide is pulled by the ink sheet, the tension lever rotates, and the rotation resistance imparting means that moves to the tension lever via the power transmission system acts to reduce the rotation resistance imparted to the ink sheet supply reel. The back tension can be kept almost constant from the beginning to the end of winding the ink sheet.

Further, even if the winding diameter of the ink sheet supply reel becomes small and the back tension temporarily becomes large,
The ink sheet guide is pulled by the ink sheet to rotate the tension lever, and the rotation resistance imparting means, which is fixed to the tension lever and moves, acts to reduce the rotation resistance imparted to the ink sheet supply reel. Back tension can be kept almost constant from the beginning to the end of winding.

Further, even if the winding diameter of the ink sheet supply reel becomes small and the back tension temporarily increases,
The ink sheet guide is pulled by the ink sheet to rotate the tension lever, and the brake pad that is fixed and moved by the tension lever acts to reduce the rotational resistance applied to the ink sheet supply reel, thereby winding the ink sheet. Back tension can be kept almost constant from the beginning to the end of winding.

Further, even if the winding diameter of the ink sheet supply reel becomes small and the back tension temporarily becomes large,
The ink sheet guide is pulled by the ink sheet, the tension lever rotates, and the brake belt that is fixed to the tension lever and moves acts to reduce the rotational resistance applied to the ink sheet supply reel. Back tension can be kept almost constant from the beginning to the end of winding.

Further, by connecting the ink sheet supply reel and the brake drum via the speed increasing means, a larger rotation resistance is applied to the ink sheet supply reel with respect to the pressing force of the rotation resistance applying member to the brake drum. Can be granted.

A wide ink sheet can be accommodated by disposing two tension levers on both sides of the ink sheet and by providing a synchronizing member that bridges the two tension levers for synchronization.

When the tension lever rotates and the rotation resistance applying means tries to release the contact with the brake drum, the stop member stops the tension lever from rotating further and the rotation resistance applying means moves to the brake drum. It is possible to always supply the ink sheet 3 without slack by suppressing the complete release of the contact.

Further, the variable rotational resistance applying means is provided with a constant rotational resistance applying means, and the rotational resistance is applied to the ink sheet supply reel at the same time by using the two rotational resistance applying means. Even if only resistance can be applied, a larger rotation resistance can be applied to the ink sheet supply reel.

The present invention will be specifically described below with reference to the drawings showing the embodiments thereof. Embodiment 1 FIG. 1 is a side view showing a configuration of a printer device according to a first embodiment of the present invention. The same reference numerals as those in FIG. 12 denote the same or corresponding parts, and the description thereof will be omitted. In the figure, 11 is a pair of supply rollers that convey the printing paper 4 to the printing unit, 12 is a speed increasing means for speeding up the rotation of the ink sheet supply reel 5, and 13 is the same as the output shaft of the speed increasing means 11. The brake drum arranged above, 14 is a movable ink sheet guide for guiding the ink sheet 3 in the supply path, 15 is a tension lever rotatably arranged to support one side of the ink sheet guide 14, and 15a is Center of rotation of tension lever 15, 16
Is a brake pad that is fixed to the tension lever 15 and presses the brake drum 13 to impart a rotational resistance to the ink sheet supply reel 5, and a felt is bonded to the tension lever 15. Reference numeral 17 denotes a tension spring that urges the tension lever 15 so that the ink sheet guide 14 moves in a direction to pull the ink sheet 3, and 18 denotes two fixed ink sheet guides that wind the ink sheet 3 around the movable ink sheet guide 14.
Reference numeral 19 is a brake unit that always applies a constant rotation resistance to the ink sheet supply reel 5, reference numeral 20 is a pair of discharge rollers that discharge the printing paper 4 to the outside of the apparatus, and a portion surrounded by broken lines is a back tension constant mechanism of the present invention. Is.

Next, the operation of the printer will be described. The printer device according to the first embodiment is configured as described above. First, the printing paper 4 is fed by the supply roller 11.
Is conveyed to a position where it is nipped by the capstan roller 9 and the pinch roller 10. Capstan roller 9 from here
The printing paper 4 is conveyed by the pinch rollers 10 to cue the printing paper, and the ink sheet take-up reel 6 rotates to cue the ink sheet. Next, after the thermal head 1 is brought into pressure contact with the platen 2, the thermal head 1 is heated while the printing paper 4 and the ink sheet 3 are being conveyed together to transfer the ink to the printing paper 4, whereby the above-mentioned conventional embodiment is carried out. The printing operation is performed in the same manner as.

Next, the ink sheet supply operation during the printing operation in the first embodiment will be described. FIG.
1 is a perspective view showing a back tension constant mechanism of the printer device according to the first embodiment of the present invention, and FIGS. 3 and 4 are side views showing the operation of the back tension constant mechanism of the printer device according to the first embodiment of the present invention. The same reference numerals as in FIG. 1 indicate the same or corresponding portions.

When the winding diameter of the ink sheet supply reel 5 at the beginning of ink sheet winding is large, the tension lever 15 is balanced by the balance between the force of the back tension of the ink sheet 3 acting on the movable ink sheet guide 14 and the tension force of the tension spring 17. Is held in the position shown in FIG.
Brake pad 16 fixed to the tension lever 15
Is pressing the brake drum 13. The pressing force applied to the brake drum 13 by the brake pad 16 increases the speed increasing means 1.
It acts as a rotation resistance on the ink sheet supply reel 5 via 2. At this time, the sum of the rotational resistance imparted to the brake drum 13 of the brake pad 16 and the rotational resistance imparted by the brake unit 19 so that the ink sheet 3 is supplied with an appropriate back tension without being loosened or pulled too much. A certain total rotation resistance is configured to be loaded on the ink sheet supply reel 5.

While the printing operation is repeated, the winding diameter of the ink sheet supply reel 5 becomes small and the back tension applied to the movable ink sheet guide 14 at the start of printing becomes large. The movable ink sheet guide 14 moves by being pulled by the ink sheet 3, and accordingly, the entire tension lever 15 rotates in the direction of the arrow around the rotation center to move from the position shown in FIG. 3 to the position shown in FIG. Therefore, the pressing force of the brake pad 16 on the brake drum 13 is reduced. Although the rotational resistance applied to the ink sheet supply reel 5 is small, the back tension is almost the same as the initial time because the winding diameter of the ink sheet supply reel 5 is small, and the tension lever 15 is centered on the rotation center 15a. Then, this time, it rotates in the direction opposite to the arrow and returns again from the position shown in FIG. 4 to the initial position shown in FIG. By supplying the ink sheet 3 while the tension lever 15 repeatedly rotates at the positions shown in FIGS. 3 and 4, it is possible to print while the back tension is always held substantially constant.

Further, as the printing operation is repeated, the winding diameter of the ink sheet supply reel 5 becomes smaller, and the back tension applied to the movable ink sheet guide 14 at the start of printing becomes larger, the tension lever 15 also moves from the position shown in FIG. By rotating the tension lever 15 repeatedly between the initial position and the position where the pressing force of the brake pad 16 on the brake drum 13 is weakened as described above, the ink sheet 3 is supplied. The back tension is kept substantially constant from the beginning to the end of the winding of the ink sheet 3.

Although the effect of supplying the ink sheet 3 at the time of printing has been described above, it goes without saying that the effect of supplying the ink sheet 3 with a substantially constant tension can be obtained even when the ink sheet 3 is indexed.

After the completion of all printing operations, the printing paper 4
Are discharged by the discharge roller 20.

According to the first embodiment, when the entire tension lever rotates in accordance with the ink sheet guide that moves due to the change in back tension, the brake pad fixed to the tension lever imparts appropriate rotation resistance to the brake drum. By being configured to
A mechanism that keeps the back tension substantially constant from the beginning to the end of winding the ink sheet can be realized with a simple configuration.

Further, by connecting the ink sheet supply reel and the brake drum via the speed increasing means, even if the lever ratio of the tension arm is small, it is larger than the pressing force of the rotation resistance applying member to the brake drum. Rotational resistance can be imparted to the ink sheet supply reel.

Further, a brake unit which is a constant rotation resistance applying means is provided together with a brake pad which is a variable rotation resistance applying means, and the rotation resistance is applied to the ink sheet supply reel at the same time by using the two rotation resistance applying means. Even if the brake pad can give only a small rotation resistance, a larger rotation resistance can be given to the ink sheet supply reel.

Embodiment 2 In the first embodiment, the brake pad is used as the member that applies the rotational resistance to the brake drum in conjunction with the ink sheet guide, but in the second embodiment, the case where the brake belt is used is shown. FIG. 5 is a side view showing a configuration of a printer device according to a second embodiment of the present invention, and the same reference numerals as those in FIG. In the figure, reference numeral 21 denotes a brake belt which is fixed to the tension lever 15 and presses the brake drum 13 to impart rotational resistance to the ink sheet supply reel 5, and is a metal belt to which felt is adhered. The part surrounded by the broken line is the back tension constant mechanism of the present invention.

Next, the ink sheet supplying operation during the printing operation in the second embodiment will be described. FIG.
FIG. 7 is a side view showing the operation of the back tension constant mechanism of the printer according to the second embodiment of the present invention.
The same reference numerals denote the same or corresponding parts.

When the winding diameter of the ink sheet supply reel 5 at the beginning of the winding of the ink sheet 3 is large, the tension lever is balanced by the balance between the force exerted by the ink sheet 3 on the movable ink sheet guide 14 by the back tension and the tension force of the tension spring 17. 15 is held at the position shown in FIG. 6, and the brake belt 21 fixed to the tension lever 15 presses the brake drum 13. The frictional force of the brake belt 21 on the brake drum 13 acts on the ink sheet supply reel 5 as rotation resistance. At this time, the rotational resistance is set so that the ink sheet 3 is not loosened or pulled too much and is supplied with an appropriate back tension.

While the printing operation is repeated, the winding diameter of the ink sheet supply reel 5 becomes small, and the back tension applied to the movable ink sheet guide 14 at the start of printing becomes large. The movable ink sheet guide 14 moves by being pulled by the ink sheet 3, and accordingly, the entire tension lever 15 rotates about the rotation center in the direction of the arrow to move from the position shown in FIG. 6 to the position shown in FIG. Therefore, the frictional force of the brake belt 21 on the brake drum 13 is reduced. Although the rotational resistance applied to the ink sheet supply reel 5 is small, the back tension is almost the same as the initial time because the winding diameter of the ink sheet supply reel 5 is small, and the tension lever 15 is centered on the rotation center 15a. Then, this time, it rotates in the direction opposite to the arrow and returns again from the position shown in FIG. 7 to the initial position shown in FIG. By feeding the ink sheet 3 while the tension lever 15 repeatedly rotates at the positions shown in FIGS. 6 and 7, it is possible to print while the back tension is always held substantially constant.

Further, as the printing operation is repeated and the winding diameter of the ink sheet supply reel 5 is reduced and the back tension applied to the movable ink sheet guide 14 at the start of printing is increased, the tension lever 15 is further moved from the position shown in FIG. As the tension lever 15 is repeatedly rotated between the initial position and the position where the frictional force of the brake belt 21 on the brake drum 13 is weakened as described above, the ink sheet 3 is supplied. The back tension is kept substantially constant from the beginning to the end of winding of the ink sheet 3.

Although the effects of the ink sheet 3 supplying operation at the time of printing have been described above, it is needless to say that the same effects can be obtained when the ink sheet 3 is indexed as in the first embodiment.

The operations of supplying, printing, and discharging the printing paper other than supplying the ink sheet are the same as those in the first embodiment.

As described above, according to the second embodiment,
When the entire tension lever rotates in accordance with the ink sheet guide that moves due to the change in back tension, the brake belt fixed to the tension lever is configured to give proper rotation resistance to the brake drum. A mechanism for keeping the back tension almost constant from the beginning to the end of winding can be realized with a simple structure.

Embodiment 3 8 is a side view showing the configuration of the printer device according to the third embodiment of the present invention.
The same reference numerals denote the same or corresponding portions, and the description thereof will be omitted. In the figure, 15b is a pin fixed to the tension lever 15, 22 is a rotatably arranged brake lever, 22a is a rotation center of the brake lever 22, and 22b is fitted with a pin 15b of the tension lever 15. Slotted hole, 23 is brake lever 22
Is a brake pad that is fixed to and presses the brake drum 13 to impart rotation resistance to the ink sheet supply reel 5. The part surrounded by the broken line is the back tension constant mechanism of the present invention.

Next, the ink sheet supplying operation during the printing operation in the third embodiment will be described. FIG.
FIG. 10 is a side view showing the operation of the back tension constant mechanism of the printer according to the third embodiment of the present invention, and the same reference numerals as those in FIG. 8 indicate the same or corresponding portions.

When the winding diameter of the ink sheet supply reel 5 at the beginning of the winding of the ink sheet 3 is large, the tension lever is balanced by the balance between the force of the ink sheet 3 acting on the movable ink sheet guide 14 by the back tension and the tension force of the tension spring 17. 15, the brake lever 22 is held at the position shown in FIG. 9, and the brake pad 23 fixed to the brake lever 22 presses the brake drum 13. The pressing force applied to the brake drum 13 by the brake pad 23 acts on the ink sheet supply reel 5 as rotation resistance. At this time, the rotational resistance is set so that the ink sheet 3 is not loosened or pulled too much and is supplied with an appropriate back tension.

While the printing operation is repeated, the winding diameter of the ink sheet supply reel 5 becomes small, and the back tension applied to the movable ink sheet guide 14 at the start of printing becomes large. The movable ink sheet guide 15 moves by being pulled by the ink sheet 3, and accordingly, the entire tension lever 15 rotates about the rotation center 15a in the direction of the arrow. The brake lever 22 is also rotated in the direction of the arrow about the rotation center 22a by the pin 15b of the tension lever to move from the position shown in FIG. 9 to the position shown in FIG. 10, and the pressing force of the brake pad 23 to the brake drum 13 is exerted. Becomes smaller. Although the rotational resistance applied to the ink sheet supply reel 5 is small, the ink sheet supply reel 5
Since the winding diameter of is small, the back tension is almost the same as the first time, and the brake lever 22 is rotated in the direction opposite to the arrow this time around the rotation center 22a. Return to the initial position shown. By supplying the ink sheet 3 while repeatedly rotating the brake lever 22 between the positions shown in FIGS. 9 and 10, it is possible to print while the back tension is always held substantially constant.

Further, as the printing operation is repeated and the winding diameter of the ink sheet supply reel 5 is reduced, and the back tension applied to the movable ink sheet guide 15 at the start of printing is increased, the brake lever 22 is further moved from the position shown in FIG. When the ink sheet 3 is supplied while the brake lever 22 is repeatedly rotated between the initial position and the position where the pressing force of the brake pad 23 on the brake drum 13 is weakened as described above, The back tension is kept substantially constant from the beginning to the end of winding of the ink sheet 3.

Although the effects in the supply operation of the ink sheet 3 at the time of printing have been described above, it is needless to say that the same effect can be obtained when the ink sheet 3 is indexed as in the first embodiment.

The operations of supplying, printing, and discharging the printing paper other than supplying the ink sheet 3 are the same as those in the first embodiment.

As described above, according to the third embodiment,
An ink sheet guide for guiding the ink sheet in the supply path and a tension lever that supports the ink sheet guide and is rotatable are provided, and the winding diameter of the ink sheet supply reel becomes small and the back tension temporarily becomes large. Also, the ink sheet guide is pulled by the ink sheet, the tension lever moves, and the brake pad that is driven by the tension lever acts to reduce the rotational resistance applied to the ink sheet supply reel. Back tension can be kept almost constant from the beginning to the end of winding.

Embodiment 4 In the first embodiment, the ink sheet guide 14 is supported in a cantilever manner, but in the fourth embodiment, the ink sheet guide is supported in two sides by the two tension levers 15. FIG.
Is a perspective view showing a back tension constant mechanism of a printer according to a fourth embodiment of the present invention, and the same reference numerals as those in FIG. 1 denote the same or corresponding portions, and the description thereof will be omitted. In the figure, 24 is a synchronizing member that is installed to synchronize the left and right tension levers 15, and 25 is fixed to the tension levers 15 and
Is rotated and the rotation resistance applying means 16 is moved to the brake drum 13.
To the position where the pressing of the tension lever 15 is released, 26 is a stop member that stops the rotation of the tension lever 15, 26 is the rotation shaft of the tension lever 15, and 27 is the rotation shaft 26 of the tension lever 15.
A central shaft support member for supporting the
It is a rectangular oblong hole that receives the tension lever 15 and stops the rotation of the tension lever 15.

Next, the operation of the fourth embodiment will be described. In FIG. 11, the ink sheet supply reel 5
The tension levers 15 provided on both sides of the
It is fixed by 4 and rotates in synchronization with each other. When the ink sheet tension changes abruptly, for example, at the start of printing, the tension lever 15 pivots at once and the brake drum 1 of the brake pad 16 is rotated.
Even if the pressure on 3 is about to be released, the stopping member 2
5 and the long hole portion 27a come into contact with each other to prevent further rotation, so that the brake pad 16 is moved to the brake drum 1.
Ink sheet 3 will not be released completely
Can always be supplied without sagging. All other operations are the same as in the first embodiment.

As described above, according to the fourth embodiment,
Arrange two tension levers on both sides of the ink sheet,
In addition, a wide ink sheet can be dealt with by including a synchronizing member that bridges two tension levers for synchronization.

When the tension lever rotates and the rotation resistance applying means tries to release the contact with the brake drum, the stopping member stops the tension lever from rotating further and the rotation resistance applying means moves to the brake drum. By suppressing the complete release of the contact of the ink sheet 3
It is possible to prevent the slack.

[0060]

Since the present invention is configured as described above, it has the following effects.

A back tension detecting means and a rotation resistance applying means are provided, and the magnitude of the rotation resistance applied to the ink sheet supply reel is adjusted in accordance with the back tension detected by the back tension detecting means. The back tension can be kept substantially constant from the beginning of winding to the end of winding. Therefore, it is possible to obtain a printer device with high printing quality without defective transfer of ink sheet or color misregistration.

Further, when the entire tension lever rotates in accordance with the ink sheet guide which moves due to the change in back tension, the rotation resistance applying means connected to the tension lever via the power transmission system applies an appropriate rotation resistance to the brake drum. By being configured to grant,
A mechanism that keeps the back tension almost constant from the beginning to the end of the winding of the ink sheet can be realized with a simple structure. Therefore, it is possible to inexpensively obtain a printer device with high printing quality without defective transfer of the ink sheet or color misregistration. it can.

Further, when the entire tension lever rotates in accordance with the ink sheet guide which moves due to the change in back tension, the rotation resistance applying means fixed to the tension lever is configured to apply an appropriate rotation resistance to the brake drum. In this way, a mechanism that keeps the back tension almost constant from the beginning of the ink sheet to the end of the ink sheet can be realized with a simple configuration. Therefore, a printer device with high printing quality without defective transfer of the ink sheet or color misregistration can be realized. It can be obtained at low cost.

Further, when the entire tension lever rotates in accordance with the ink sheet guide which moves due to the change in back tension, the brake pad fixed to the tension lever gives a proper rotation resistance to the brake drum. As a result, a mechanism that keeps the back tension almost constant from the beginning of the ink sheet to the end of the winding can be realized with a simple configuration. Therefore, a printer device with high printing quality without defective transfer of the ink sheet or color misalignment can be manufactured at low cost. Obtainable.

Further, when the entire tension lever rotates in accordance with the ink sheet guide which moves due to the change in back tension, the brake belt fixed to the tension lever imparts proper rotation resistance to the brake drum. As a result, a mechanism that keeps the back tension almost constant from the beginning of the ink sheet to the end of the winding can be realized with a simple configuration. Therefore, a printer device with high printing quality without defective transfer of the ink sheet or color misalignment can be manufactured at low cost. Can be configured.

Further, the ink sheet supply reel and the brake drum are connected via the speed increasing means to impart a greater rotational resistance to the ink sheet supply reel against the pressing force of the rotational resistance applying member to the brake drum. By
The mechanism that keeps the back tension almost constant from the beginning of the ink sheet to the end of the winding is simple and can be constructed in a small size.
For this reason, it is possible to configure a small-sized and inexpensive printer device with high printing quality without defective transfer of ink sheets or color misregistration.

Further, by disposing two tension levers on both sides of the ink sheet, and by providing a synchronizing member that bridges the two tension levers for synchronization, an ink sheet compatible with a wide ink sheet can be obtained. It is possible to obtain a printer device having high printing quality without defective transfer or color misregistration.

When the tension lever rotates and the rotation resistance applying means tries to release the contact with the brake drum, the stop member stops the tension lever from rotating further and the rotation resistance applying means moves to the brake drum. It is possible to prevent the looseness of the ink sheet by suppressing the complete release of the contact of the ink sheet, and thus it is possible to obtain a printer device having a high printing quality that can always supply the ink sheet stably.

Further, by providing the constant rotation resistance imparting means together with the variable rotation resistance imparting means, and imparting a larger rotation resistance to the ink sheet supply reel even if the variable rotation resistance imparting means can impart only a small rotation resistance, The mechanism that keeps the back tension almost constant from the beginning of the ink sheet to the end of the winding is simple and can be configured in a small size. Therefore, the printer device with high printing quality without defective transfer of ink sheet or color misregistration is small and inexpensive Can be configured.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of a printer device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a back tension constant mechanism of the printer according to the first embodiment of the present invention.

FIG. 3 is a side view showing the operation of the back tension constant mechanism of the printer according to the first embodiment of the present invention.

FIG. 4 is a side view showing the operation of the back tension constant mechanism of the printer according to the first embodiment of the present invention.

FIG. 5 is a side view showing a configuration of a printer device according to a second embodiment of the present invention.

FIG. 6 is a side view showing the operation of the back tension constant mechanism of the printer according to the second embodiment of the present invention.

FIG. 7 is a side view showing the operation of the back tension constant mechanism of the printer according to the second embodiment of the present invention.

FIG. 8 is a side view showing a configuration of a printer device according to a third embodiment of the present invention.

FIG. 9 is a side view showing the operation of the back tension constant mechanism of the printer according to the third embodiment of the present invention.

FIG. 10 is a side view showing the operation of the back tension constant mechanism of the printer according to the third embodiment of the present invention.

FIG. 11 is a perspective view showing a back tension constant mechanism of a printer device according to a fourth embodiment of the present invention.

FIG. 12 is a side view showing a conventional printer device.

[Explanation of symbols]

1 thermal head, 2 platen, 3 ink sheet, 4 printing paper, 5 ink sheet supply reel, 6 ink sheet take-up reel, 7 supply side ink sheet guide, 8 peeling member, 9 capstan roller, 10 pinch roller, 11 supply Roller, 12 speed increasing means, 13
Brake drum, 14 Movable ink sheet guide, 15
Tension lever, 15a Tension lever rotation center, 15b Drive pin, 16 Brake pad, 17
Tension spring, 18 Fixed ink sheet guide, 19
Brake unit, 20 Ejection roller, 21 Brake belt, 22 Brake lever, 22a Brake lever rotation center, 22b Brake lever slot, 23
Brake pad, 24 synchronization member, 25 stop member, 2
6 tension lever rotation shaft, 27 center shaft support member,
27a Long hole part.

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[Procedure amendment]

[Submission date] February 8, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

[Figure 3]

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiji Kishikawa 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Yoshinori Tsunoda 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Inventor Kunihiko Nakagawa 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd.

Claims (9)

[Claims] 1. A state in which an ink sheet coated with a heat-meltable or heat-sublimable ink and a printing paper are overlapped and sandwiched between a thermal head having a heating resistor and a roller platen. The thermal head is heated to transfer the ink on the surface of the ink sheet onto the printing sheet, the printing sheet is conveyed, and the ink sheets sequentially fed from the ink sheet supply reel are wound on the ink sheet take-up reel and run. In a thermal transfer type printer apparatus for forming an image on a printing paper by this, a tension detecting means provided in an ink sheet supply path for detecting the ink sheet tension immediately before passing through the thermal head, and an ink sheet. The supply reel is provided with rotation resistance applying means for applying and releasing rotation resistance, and is detected by the tension detecting means. A printer apparatus, which is configured to adjust a magnitude of a rotation resistance applied to an ink sheet supply reel according to a magnitude of an ejected ink sheet tension. 2. An ink sheet coated with heat-melting or heat-subliming ink and a printing paper are sandwiched between a thermal head having a heat-generating resistor and a roller platen. The thermal head is heated to transfer the ink on the surface of the ink sheet onto the printing sheet, the printing sheet is conveyed, and the ink sheets sequentially fed from the ink sheet supply reel are wound on the ink sheet take-up reel and run. In a thermal transfer type printer device for forming an image on a printing paper by this, a brake drum connected to the ink sheet supply reel via a rotation transmission system, and an ink sheet guide for guiding the ink sheet in the supply path, A tension lever that supports one side or both sides of the ink sheet guide and is rotatable, A tension spring that urges the tension lever so that the sheet guide moves in the direction of pulling the ink sheet, and a rotation resistance that is connected to the tension lever via a power transmission system to apply and release rotation resistance to the brake drum. A printer device, comprising: an applying unit, configured to adjust the magnitude of the rotational resistance applied to the ink sheet supply reel according to the magnitude of the ink sheet tension. 3. An ink sheet coated with heat-meltable or heat-sublimable ink between a thermal head having a heating resistor and a roller-shaped platen and a photographic printing paper are sandwiched in a stacked manner. The thermal head is heated to transfer the ink on the surface of the ink sheet onto the printing sheet, the printing sheet is conveyed, and the ink sheets sequentially fed from the ink sheet supply reel are wound on the ink sheet take-up reel and run. In a thermal transfer type printer device for forming an image on a printing paper by this, a brake drum connected to the ink sheet supply reel via a rotation transmission system, and an ink sheet guide for guiding the ink sheet in the supply path, A tension lever that supports one side or both sides of the ink sheet guide and is rotatable, The sheet guide is provided with a tension spring for urging the tension lever so as to move in the direction of pulling the ink sheet, and a rotation resistance applying unit fixed to the tension lever for applying and releasing the rotation resistance to the brake drum. A printer device, which is configured to adjust a magnitude of a rotation resistance to be applied according to a magnitude of a sheet tension. 4. The printer device according to claim 2, wherein the rotation resistance applying means for applying and releasing the rotation resistance to the brake drum is a brake pad. 5. The printer device according to claim 2, wherein the rotation resistance applying unit that applies and releases the rotation resistance to the brake drum is a brake belt. 6. A speed increasing means for speeding up the rotation of the ink sheet supply reel is provided in a path of a power transmission system between the ink sheet supply reel and the brake drum. The printer device according to any one of claims 2 to 5. 7. A synchronizing member, wherein two tension levers are arranged on both sides of an ink sheet, and a synchronizing member is provided to bridge the two tension levers for synchronization. The printer device according to any one of 1. 8. A stop member for stopping the rotation of the tension lever is provided at a position where the tension lever rotates and the rotation resistance applying means releases the contact with the brake drum. The printer device according to any one of claims 2 to 5. 9. A variable rotation resistance imparting means for adjusting the magnitude of the rotation resistance imparted to the ink sheet supply reel according to the ink sheet tension, and a constant rotation resistance impartation for always imparting a constant rotation resistance to the ink sheet supply reel. 6. The printer device according to claim 2, further comprising means and means.