JPH042657U

JPH042657U -

Info

Publication number: JPH042657U
Application number: JP4412390U
Authority: JP
Priority date: 1990-04-25
Filing date: 1990-04-25
Publication date: 1992-01-10

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例の要部を示す図であ
る。第２図は従来のサーマルプリンタの概略構成
を示す図である。１……サーマルヘツド、２……プラテン、１１
……ヘツド接離機構、１２……ヘツド支持部材、
１５……偏心カム（係合部材）、１６……カム軸
（駆動軸）、２１……インクフイルム送り機構、
２２……巻取芯、２９……インクフイルム用モー
タ（駆動モータ）、４１……選択切替手段、４５
……ワンウエイギヤ（第１のワンウエイクラツチ
部材）、５７……ワンウエイギヤ（第２のワンウ
エイクラツチ部材）。 FIG. 1 is a diagram showing a main part of an embodiment of the present invention. FIG. 2 is a diagram showing a schematic configuration of a conventional thermal printer. 1... Thermal head, 2... Platen, 11
...Head contact/separation mechanism, 12...Head support member,
15... Eccentric cam (engaging member), 16... Camshaft (drive shaft), 21... Ink film feeding mechanism,
22... Winding core, 29... Ink film motor (drive motor), 41... Selection switching means, 45
...One-way gear (first one-way clutch member), 57... One-way gear (second one-way clutch member).

Claims

[Scope of claims for utility model registration] (1) The thermal head is pressed against the platen.
In a thermal printer equipped with a head contact/separation mechanism for separating the ink film and an ink film feeding mechanism having a take-up core capable of winding the ink film, the head contact/separation mechanism may be rotated around one point around the thermal head. a head support member that can be moved to press against and separate from the platen; an engagement member that can engage with the head support member and rotate the head support member; a drive shaft for driving the member, and a drive motor capable of rotationally driving both the take-up core of the ink film feeding mechanism and the drive shaft of the head contact/separation mechanism; A thermal printer comprising a selection switching means for selectively transmitting power to either the winding core or the drive shaft. (2) The selection switching means includes a first one-way clutch member that transmits power only when the drive motor rotates in the normal direction, and a second one-way clutch member that transmits power only when the drive motor rotates in the reverse direction. The winding core and the drive motor are connected using one of both one-way clutch members, the drive shaft and the drive motor are connected using the other one-way clutch member, and the drive shaft is connected to the drive motor using the other one-way clutch member. The thermal printer according to claim 1, wherein the thermal printer is configured to selectively transmit power from the drive motor to either the winding core or the drive shaft by switching the rotational direction of the motor. .