JPS62267180A - Ink ribbon control system - Google Patents

Abstract

PURPOSE:To prevent the difference of printing density, in an impact type line printer, by controlling a feed speed of an ink ribbon by the operation direction of a printing head. CONSTITUTION:When an operation direction signal of a printing head 1 is outputted to a control part for the feed speed of an ink ribbon 2, a ribbon feed motor is controlled to a predetermined speed by controlling frequency or voltage so that the relative speed of the printing head to the ribbon may be in a definite range. That is, the speed of the movement of the printing head 1 in the right and left direction is kept constant, and the speed of the ink ribbon is controlled according to a printing head operation direction so that the feed speed of the ink ribbon 2 at the time of the 'right left' movement of the printing head may become equal to or less than that of the ink ribbon at the time of the 'left right' movement of the printing head. As a result, the difference between the relative speeds of the printing head and the ink ribbon is reduced, and elimination of the difference of printing density due to the operation direction can effectively be obtained.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an ink ribbon feed rate control system.

[Conventional technology]

Conventionally, the ink ribbon of impact-type line printers and the like has been fed at the same speed regardless of the direction of movement of the head.

[Problem that the invention seeks to solve]

The conventional ribbon feeding method described above has the disadvantage that the relative relationship with the ink ribbon feeding speed varies greatly depending on the direction of operation of the print head, and the print density etc. differs depending on the direction of operation of the print head.

[Means for solving problems]

In the ink ribbon feed speed control system of the present invention, the ink ribbon motor feed speed is controlled by the print head operating direction.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The print head motion direction control section 1 outputs a print head motion direction signal to the ink ribbon feed speed control section 2 . The ink ribbon feed speed control unit 2 controls the ribbon feed motor (1) by frequency control or voltage control so that the relative speed between the print head and the ribbon is within a certain range according to the print head movement direction signal and at a predetermined speed. C motor or step motor).

FIG. 2 is an explanatory diagram regarding the speed of the print head and ribbon. In Fig. 2, the print head 1 moves at a speed of one foot in both left and right directions, and the ink ribbon 2 is also fed at a constant speed from left to right or from right to left. →When moving to the right, the speed relationship with the ribbon will be different. In other words, in Figure 2, if the speed of the print head's movement from left to right is constant and the feed speed of the ink ribbon when the print head moves from left to right is 1, then the ink when the print head moves from right to left is By setting the ribbon feeding speed to 1 or less, the speed relationship between the horizontal movement of the print head and the ink ribbon can be made smaller than in the past.

〔Effect of the invention〕

As explained above, by controlling the ink ribbon feeding speed according to the print head operating direction, the difference in relative speed between the print head and the ink ribbon is small, and the effect of eliminating differences in print quality due to the print head operating direction is achieved. There is.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. FIG. 2 is a diagram illustrating the relationship between the print head and ribbon speed.

Claims (1)

[Claims] In an impact type line printer, an ink ribbon feed speed control method is characterized in that the feed speed of the ink ribbon is controlled according to the direction of operation of a print head.