JPH0241281A - Ink ribbon cartridge for heat transfer serial printer - Google Patents

Abstract

PURPOSE:To apply a suitable tension to an ink ribbon corresponding to the diameter of a supply roll of a ribbon by pressing a conductive sheet to the roll in contact by a protrusion formed on a case near the outer periphery of the roll. CONSTITUTION:A protrusion 5 is provided near the outer periphery of a supply roll 1a of a box-shaped cartridge case 4, a conductive sheet 6 provided on the inner faces of the upper and lower faces of the case 4 is pressed in contact to the outer periphery of the roll of an ink ribbon wounded on the roll 1a to generate pressure to the outer periphery of the roll of the ribbon. A braking force R to the conveying force F of the ribbon is generated by a frictional force between the sheet 4 and the roll of the ribbon. The pressure is varied by the diameter of the ink ribbon roll on the roll 1a to suitably control the force R. Accordingly, since no wrinkle and contaminant of the ribbon exist, printing of high quality can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ink ribbon cartridge used in a thermal transfer serial printer.

[Conventional technology]

Conventional thermal transfer serial printers: - During printing operation,
A constant torque friction force is applied to the ink ribbon supply roll (supply roll) in order to provide an appropriate tension to the conveying force of the ink ribbon, which runs while being closely pressed against the recording paper by the thermal head and platen. The carrier has a mechanism that generates braking force.

[Problem to be solved by the invention]

As mentioned above, in conventional thermal transfer serial printers, as a braking mechanism for the ink ribbon supply roll of the ink ribbon cartridge, a constant torque of frictional force is applied to the supply roll, so that the tension of the ink ribbon running in the thermal head section is reduced. The tension varies depending on the diameter of the ink ribbon roll wound around the supply roll, and when the diameter of the ink ribbon roll is large, this tension is insufficient and the ink ribbon is likely to run skewed or wrinkled, while when the diameter is small This method has the disadvantage that the tension of the ink ribbon increases, making it easy for slipping and rubbing to occur between the ink ribbon and the recording paper.

[Means to solve the problem]

The ink ribbon cartridge of the present invention includes a conductive sheet provided near the outer periphery of the ink ribbon roll in the case,
The case is provided with a protrusion for pressing the conductive sheet into contact with the outer periphery of the ink ribbon roll wound around the supply roll.

That is, the ink ribbon cartridge for a thermal transfer serial printer of the present invention includes a supply roll in which an ink ribbon coated with a heat-melting ink on one side of a plastic film base material is wound into a roll, and the ink ribbon fed out from the supply roll. a winding roll for winding the ink ribbon; two conductive sheets disposed above and below the supply roll and the winding roll to sandwich them; and the supply roll, the winding roll, and the conductive sheet. a case for storing a sheet, a protrusion is provided near the outer periphery of the roll of the ink ribbon wound around the supply roll of the case, and the protrusion allows the conductive sheet to be placed around the outer periphery of the roll of the ink ribbon. It is configured so that it can be pressed into contact with.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
FIG. 3 is a sectional view taken along line X-X of the embodiment shown in the figure.

In FIGS. 1 and 2, an ink ribbon supply roll (supply roll) la is wound with an ink ribbon coated with a heat-melting ink on one side of a base material of a plastic film such as polyester. The ink ribbon 1b pulled out from the supply roll 1a is guided by two guide rollers 3 and wound onto a take-up roll 2.

Supply roll 1 of box-shaped cartridge case (case) 4
A protrusion 5 is provided near the outer periphery of the case 4.
The conductive sheet 6 provided on the inner surface of the upper and lower surfaces of the ink ribbon is pressed and brought into contact with the outer periphery of the roll of the ink ribbon wound around the supply roll 1a, and a pressure P is generated against the outer periphery of the roll of the ink ribbon. I'm letting you do it. Therefore, the conductive sheet 4
A braking force R against the conveyance force F of the ink ribbon is generated by the frictional force between the ink ribbon and the roll of the ink ribbon. The pressure P is changed depending on the diameter of the ink ribbon roll on the ink ribbon supply roll 1a to appropriately control the braking force R.

〔Effect of the invention〕

As explained above, in the ink ribbon cartridge of the present invention, a protrusion is provided on the case near the outer periphery of the ink ribbon roll wound around the supply roll, and the conductive sheet is pressed against the ink ribbon roll by the protrusion. By making contact with the ink ribbon, it is possible to apply appropriate tension to the ink ribbon according to the diameter of the ink ribbon roll. Therefore, there are no wrinkles or stains on the ink ribbon, and high-quality printing can be achieved. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
FIG. 3 is a sectional view taken along line X-X of the embodiment shown in the figure. 1a... Supply roll, 1b... Ink ribbon, 2.
... Winding roll, 3... Guide roller, 4... Case, 5... Protrusion, 6... Conductive sheet.

Claims (1)

[Claims] A supply roll in which an ink ribbon coated with heat-melting ink on one side of a plastic film base material is wound into a roll, a take-up roll for winding up the ink ribbon fed out from the supply roll, and the supply roll. two conductive sheets disposed above and below the winding roll, and a case housing the supply roll, the winding roll, and the conductive sheet; A protrusion is provided near the outer periphery of the roll of the ink ribbon wound around the supply roll, and the conductive sheet is pressed against and comes into contact with the outer periphery of the roll of the ink ribbon by the protrusion. Ink ribbon cartridge for thermal transfer serial printer.