JPS63145646U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a ribbon winding device that is an embodiment of the present invention, FIG. 2 is an external view of a word processor that is an example of the application, and FIG. 3 is a sectional view of FIG. 1. 4 is a plan view of the ribbon cassette of FIG. 1 with the top plate removed, and FIG. 5 is a block diagram showing a control circuit for the ribbon winding mechanism of FIG. 1. 2: Thermal printer, 6: Carriage, 12
: Print paper, 14: Thermal head, 16: Ribbon cassette, 18: Ink ribbon, 24: Supply side spool, 26: Take-up side spool, 32: Ribbon take-up motor, 36: Hollow shaft, 42: Spool drive cam, 46, 50: annular felt member, 44: flange portion, 48: flange member, 52: ribbon drive gear.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a thermal printer that prints by thermal transfer while pressing the print head that moves with the carriage against the print paper via an ink ribbon, supply from the supply spool to the print head as printing progresses. A ribbon winding device that peels off the ink ribbon after it has been thermally transferred and then winds it onto a take-up spool while peeling it off from the printing paper, and is provided on a carriage and integrally engages with the take-up spool to remove the ink ribbon from the printing paper. a ribbon winding member that rotates the ribbon winding member; a rotational drive member that is engaged with the ribbon winding member via a power transmission loss member; A ribbon winding motor that causes a relative slip between the ribbon winding member and the ribbon winding member and rotates the ribbon winding member based on the resistance caused by the slip; and detecting the outer diameter of the ink ribbon on the winding side or supply side spool. Based on the ribbon outer diameter detection means and the detection signal of the ribbon outer diameter detection means,
A ribbon winding device for a thermal printer, comprising a motor control means for changing the rotational speed of the ribbon winding motor in response to a change in a winding diameter, which is an outer diameter of an ink ribbon on a winding side spool. . (2) The motor control means reduces the rotational speed of the ribbon winding motor in response to an increase in the winding diameter of the ink ribbon, based on the detection signal of the ribbon outer diameter detection means, and increases the winding diameter. A utility model according to claim 1, characterized in that the ribbon winding motor is drive-controlled so as to keep the relative sliding speed between the ribbon winding member and the rotational drive member substantially constant regardless of the increase in the speed. Ribbon winding device. (3) The power transmission loss member is constituted by a member whose resistance increases as the relative sliding speed between the ribbon winding member and the rotational drive member increases, and the motor control means is configured to increase the resistance of the ribbon outer diameter detection means. Based on the detection signal, the rotational speed of the ribbon winding motor is increased as the winding diameter of the ink ribbon increases, and the ribbon winding is performed so as to increase the relative sliding speed between the ribbon winding member and the rotational drive member. A ribbon winding device according to claim 1, characterized in that a winding motor is driven and controlled.