JPS63145649U

JPS63145649U -

Info

Publication number: JPS63145649U
Application number: JP3976087U
Authority: JP
Priority date: 1987-03-18
Filing date: 1987-03-18
Publication date: 1988-09-26

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例であるサーマルプリ
ンタのリボン巻取機構を示す垂直断面図、第２図
は適用対象の一例である電子タイプライタの外観
図、第３図は第１図における―断面図、第４
図は第１図のリボンカセツトの上板を除いて示す
平面図、第５図は第１図のリボン巻取機構の制御
回路を示すブロツク図である。２：サーマルプリンタ、６：キヤリツジ、１０
：印字用紙、１２：サーマルヘツド、１４：リボ
ンカセツト、１６：インクリボン、２２：供給側
スプール、２４：巻取側スプール、３２：ギヤ軸
、３４：リボン駆動ギヤ、３６：リボン巻取モー
タ、４４：フオトセンサ。 Fig. 1 is a vertical sectional view showing the ribbon winding mechanism of a thermal printer which is an embodiment of the present invention, Fig. 2 is an external view of an electronic typewriter which is an example of the application target, and Fig. 3 is the same as that shown in Fig. 1. -Cross section, No. 4
This figure is a plan view of the ribbon cassette shown in FIG. 1 with the top plate removed, and FIG. 5 is a block diagram showing a control circuit for the ribbon winding mechanism shown in FIG. 1. 2: Thermal printer, 6: Carriage, 10
: Print paper, 12: Thermal head, 14: Ribbon cassette, 16: Ink ribbon, 22: Supply side spool, 24: Take-up side spool, 32: Gear shaft, 34: Ribbon drive gear, 36: Ribbon take-up motor, 44: Photo sensor.

Claims

[Scope of Claim for Utility Model Registration] A print head provided on a carriage is movably supported between a print position where it contacts the print paper via an ink ribbon and a release position where it is separated from the print paper, and the print head is The ink ribbon is printed by thermal transfer while moving with the carriage at the printing position.As the printing progresses, the ink ribbon is supplied from the supply side spool to the print head, and after being thermally transferred, the ink ribbon is peeled off from the printing paper and transferred to the take-up side. This is a thermal printer that winds up the ink ribbon onto a spool and absorbs slack in the ink ribbon that occurs when the print head is retracted from the printing position to the release position by winding it onto the spool on the winding side. a ribbon winding member that integrally engages with the spool on the take-up side and rotates the spool; a ribbon take-up motor that is provided on the carriage and rotates the ribbon take-up member; Based on the ribbon outer diameter detection means for detecting the outer diameter of the ink ribbon and the detection signal of the ribbon outer diameter detection means,
The amount of motor rotation for absorbing the slack of the ink ribbon at the time of release is reduced as the ribbon winding diameter, which is the outer diameter of the ink ribbon on the winding side spool, increases, regardless of the increase in the ribbon winding diameter. 1. A thermal printer comprising: a motor control means for maintaining a constant ribbon winding amount when absorbing slack.