JPS63104875A - Transfer-type serial printer - Google Patents

Abstract

PURPOSE:To enable two-direction printing while maintaining printing quality and enhance throughout of printing, by providing a means for feeding an ink ribbon according to the movement of a printing part in one direction, in a direction reverse to the moving direction of the printing part, a means for feeding the ribbon in the reverse direction by an amount corresponding to the movement of the printing part after the movement of the printing part is finished, and a means for feeding the ink ribbon according to the movement of the printing part in the other direction, in the reverse direction. CONSTITUTION:Printing in a forward movement of a printing part 2 is performed by moving the printing part forward with a printing head 8 pressed against a printing medium 10. After the forward movement is finished and before a backward movement is started, the head 8 is separated from the medium 10, and an ink ribbon 11 is taken up around a take-up side reel 4 by a ribbon motor 6 for forward rotation, by an amount equal to the amount by which the printing part is moved in the reverse direction. Printing in the backward movement is performed by rotating a ribbon motor 7 for reverse rotation in the direction of an arrow while moving the printing part backward. When the backward printing is finished, the ribbon motor 6 for forward rotation is rotated in the direction of an arrow, whereby the ribbon 11 is taken up by an amount equal to the backward moving amount of the printing part, resulting in an initial state.

Description

TECHNICAL FIELD The present invention relates to a transfer type serial printer, and more particularly to a transfer type serial printer capable of bidirectional printing.

In transfer type serial printers, in order to print with zero relative speed difference between the print medium and the ink ribbon, printing is performed only when the printing part moves in one direction, and printing occurs when moving in the opposite direction. did not do so.

Therefore, there is a drawback that printing throughput is low.

Therefore, an object of the present invention is to provide a transfer type serial printer capable of printing in both directions.

Structure of the Invention According to the present invention, a printing section having a transfer type print head and moving in the left-right direction with respect to the printing medium, an ink ribbon cassette mounted on the printing section, and an ink ribbon cassette mounted on the printing section according to the movement of the printing section in one direction. means for feeding the ink ribbon in the ink ribbon cassette in a direction opposite to the moving direction of the printing section; A device capable of bidirectional printing, comprising means for feeding the ribbon in a direction opposite to the one direction, and means for feeding the ink ribbon in a direction opposite to the other direction in response to movement of the printing section in the other direction. A transfer type serial printer is obtained.

1-1 Next, the present invention will be described in more detail with reference to the drawings showing one embodiment of the present invention.

Referring to FIG. 1, one embodiment of the present invention includes a printing unit 2 that moves along a guide shaft 1, an ink ribbon cassette 3 that is detachably mounted on the printing unit 2, and an ink ribbon cassette 3 that is fixed to the printing unit 2. A forward rotation ribbon motor 6 and a reverse rotation ribbon motor 7 that respectively engage the take-up reel 4 and the supply reel 5 of the ink ribbon cassette 3, and the printing unit 2.
It has a print head 8 and a platen 9. While the print head 8 is pressed against the medium 10 by a print signal supplied from a host device, the print element of the print head 8 generates heat in response to the print signal, and ink from the ink ribbon 11 is transferred to the print medium 10.

Printing when the printing section 2 moves in the forward direction is performed by moving the printing section in the forward direction while the print head 8 presses the print medium 10. Furthermore, by making the moving speed of the printing unit 2 coincide with the speed of the ink ribbon 11 by the normal rotation ribbon motor 6 by rotating the normal rotation ribbon motor 6 in the direction of the arrow, the relative speed difference between the ink ribbon 11 and the printing medium 10 can be reduced. I'm setting it to zero.

After the forward movement of the printing section ends and before the printing section starts moving in the reverse direction, the ribbon motor for normal rotation is activated by an amount equal to ω, at which the print head 8 separates from the printing medium 10 and the printing section moves in the reverse direction. 6, the ink ribbon 11 is wound onto the take-up reel 4. At this time, the ribbon motor 7 for reverse rotation
is not energized.

Printing when the printing unit 2 moves in the reverse direction is performed while the print head 8 presses the printing medium 10 while moving the printing unit in the reverse direction. In this case, the ink ribbon 11 is sent at the same speed as the movement of the print section by the rotation of the reverse ribbon motor 7 in the direction of the arrow, so the relative speed with the print medium 10 becomes zero.

When printing in the reverse direction is completed, the print head 8 separates from the print medium 10, and the ribbon motor 6 for normal rotation rotates in the direction of the arrow to move the ink ribbon 11 in the same direction as the print part in the reverse direction σ.
By winding it onto the take-up reel 4, it becomes an initial state, and then printing in the printing section in the forward direction becomes possible.

As described in detail, the present invention enables bidirectional printing while maintaining high print quality, and has the effect of improving printing throughput.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention. Explanation of symbols of main parts 6... Ribbon motor for forward rotation 7... Ribbon motor for reverse rotation 8...Print head 10... Printing medium 11... Ink ribbon

Claims (1)

[Claims] A printing unit having a transfer type print head and moving in the left-right direction with respect to the printing medium, an ink ribbon cassette mounted on the printing unit, and an ink ribbon in the ink ribbon cassette as the printing unit moves in one direction. means for sending the ink ribbon in a direction opposite to the moving direction of the printing section; and after the printing section finishes moving in the one direction, the ink ribbon is moved in the opposite direction to the one direction by an amount corresponding to the printing section moving section in the other direction. 1. A transfer type serial printer capable of bidirectional printing, comprising a feeding means and a means for feeding the ink ribbon in a direction opposite to the other direction in response to movement of the printing section in the other direction.