JPH02147251A - Thermal transfer printer head heat sink - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a head heat sink for a thermal transfer printer.

[Prior Art Wg] In a thermal transfer printer, as shown in FIG. 5, the thermal head 5 moves in the direction of arrow α, and in conjunction with this, the ink ribbon 6 runs from arrow A to arrow C to perform printing. A thermal head incorporating a conventional head heat sink has a shape as shown in FIG. When printing with a thermal head incorporating this conventional head heat sink, the ink ribbon 6 is subjected to a head pressing force f on the upper half surface where the platen 7 is located, as shown in FIG. As a result, during printing, the upper half of the ink ribbon 6 is subjected to higher running resistance than the lower half, and this force d that generates a downward force d causes the ink ribbon 6 to bend downward, causing print chipping.

In the conventional technology, printing defects caused by misalignment of the ink ribbon have been solved by widening the width of the ink ribbon.

[Problem M to be solved by the invention] However, when the width of the conventional ink ribbon is widened, the ink ribbon unit cost increases due to the wide width of the ink ribbon, and the ribbon force set increases. It had In order to solve these conventional problems, the present invention aims to eliminate the displacement of the ink ribbon relative to the head that occurs during printing.

[Means for Solving the Problems] In order to solve the above problems, the head heat dissipation plate of the thermal transfer printer of the present invention has one end of the contact surface with the ribbon on the ribbon supply side that has a higher temperature than the other end, and has a print heat dissipation plate that is higher than the other end. It is characterized by having a raised surface that is lower than the body.

[Function] When printing with a thermal transfer printer incorporating the head heat dissipation plate configured as described above, one end of the contact surface with the ribbon on the ribbon supply side of the head heat dissipation plate is higher than the other end (and the print heating element The lower raised surface applies upward force to the ink ribbon as it tries to shift downward against the thermal head.This force balances the forces applied to the ink ribbon, allowing printing without the ink ribbon shifting. .

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing the printing surface of a thermal head incorporating a head heat dissipation plate of a thermal transfer printer according to the present invention. A head chip 2 is adhesively fixed on a head heat sink 1, and a heat generating element 5 is provided on the head chip 2. The head heat sink 1 has a raised surface where one end of the contact surface with the ribbon on the ribbon supply side of the head heat sink is higher than the other end and lower than the print heating element, which is a feature of the present invention.

FIG. 2 is a side view of the head heat sink and ink ribbon of the present invention during printing. The raised surface 4, which is a feature of the head heat dissipation plate of the present invention, generates a higher surface pressure at the contact portion with the ink ribbon 6 than at other portions. As a result, during printing, a higher running resistance is generated in the contact portion than in other portions. Due to this running resistance, an upward force e is applied to the ink ribbon 6. By dynamically balancing this upward force e with the downward force d shown in FIG. 4, it was possible to successfully eliminate the displacement of the ink ribbon.

In addition, as shown in FIG. 3, the platen 7 is ink +77
A raised portion 4, which is a feature of the head heat sink of the present invention, is located on the lower half of the head heat sink 6 and is disposed on the top of the head heat sink 1. The configuration described above may be reversed. Alternatively, by applying friction coefficient reduction treatment (Teflon coating, etc.) to the surface of the head heat sink, it is possible to reduce ribbon slippage due to local variations in the friction coefficient between the ink ribbon and the head heat sink. Furthermore, ribbon running can be made more stable.

[Effects of the Invention] As explained above, in the head heat sink of the thermal transfer printer of the present invention, one end of the contact surface with the ribbon on the ribbon supply side of the head heat sink is higher than the other end and lower than the printing heating element. The simple structure of the raised surface eliminates the vertical gap υ of the ribbon relative to the thermal head, and is effective in eliminating print defects.

[Brief explanation of the drawing]

FIG. 1 is a state of the printing surface of the thermal head incorporating the head heat sink of the thermal transfer printer of the present invention. FIG. 2 is a side view of the head heat sink of the present invention and the ink ribbon during printing. FIG. 5 is a sectional view of essential parts showing an embodiment of a thermal transfer printer incorporating the head heat sink of the present invention. FIG. 4 is a sectional view of essential parts of an embodiment of a thermal transfer printer incorporating a conventional head heat sink. FIG. 5 is a state diagram of main parts showing the printing operation function of the thermal transfer printer. FIG. 6 is a diagram showing the printing surface of a thermal head incorporating a head heat dissipation plate of a conventional thermal transfer printer. 1... Head heat sink 2... Hesode tip... Print heating element... Raised surface...・・・・・・Self-Marhead・・・・・・Ink Ribbon・・・・・・Platend

Claims (1)

[Claims] In the head heat dissipation plate of a thermal transfer printer, the ribbon supply side of the head heat dissipation plate has a raised surface where one end of the contact surface with the ribbon is higher than the other end and lower than the printing heating element, and the contact surface with the ribbon is raised. A head heat dissipation plate for a thermal transfer printer, characterized by being treated to reduce the coefficient of friction.