JPH05116421A - Printing device - Google Patents

Abstract

PURPOSE:To make printing density variable by providing an angle regulating mechanism for regulating an angle of a printing head with respect to the direction in which a sheet is fed, a printing head angle controlling section, and a printing timing controlling section corresponding to the angle of the printing head. CONSTITUTION:A sheet 4 on a platen 3 is pressed to the side of the platen 3 by a printing head 1 so as to be held between the printing head 1 and the platen 3, and is fed in the direction shown by the arrow A. An angle regulating mechanism 6 for regulating an angle of the printing head 1 with respect to the sheet-feeding direction A makes the printing head 1 assume a variable angle alpha of inclination from a position normal to the sheet-feeding direction A. An angle controlling mechanism 7 sets the angle alpha of inclination of the printing head 1 by controlling the angle regulating mechanism 6 and communicates the angle information to a printing timing controlling section 8. This printing timing controlling section 8 detects relative positions among the angle alpha of inclination of the printing head 1, the sheet 4 and the printing head 1, and sends printing data to the printing head 1 to make it perform printing while controlling the printing timing in relation to dot heads 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line head type printer, and more particularly to a variable print density function.

[0002]

2. Description of the Related Art In a conventional printing apparatus of this kind, there is no mechanism control for changing the angle of the print head with respect to the sheet conveying direction, and therefore the print density is fixedly determined by the dot density of the dot head. , Couldn't change this. Further, since the print head is arranged so as to be orthogonal to the paper transport direction, it is possible to perform printing such that all dot heads of the print head are driven simultaneously, for example, in the case of printing one line of ruled lines. Had a larger power supply or divided print control.

[0003]

In this conventional printing device, the printing density cannot be changed, so that it is not compatible with other printing devices, and in order to increase the printing density, the dot density is high. The print head must be selected, which increases the cost.
Further, when printing is performed at one time, such as printing a ruled line for one line, a power source with a large capacity is required, or the printing speed is reduced by the divided printing control of one dot line. There was a flaw. The present invention has been made in view of the above-mentioned conventional problems or drawbacks,
It is an object of the invention to provide a printing device capable of changing the printing density.

[0004]

In order to achieve this object, a printer according to the present invention is a printer for printing on a sheet on a flat platen by a print head in which dot heads are arranged in a line. An angle adjusting mechanism that adjusts the angle of the print head with respect to the sheet conveying direction, a print head angle control unit that controls the angle adjusting mechanism, and a print that controls the print timing corresponding to the angle of the print head. And a timing controller.

[0005]

In the present invention, the distance between the print dots can be changed by changing the angle of the print head with respect to the paper conveyance direction.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a printing apparatus according to the present invention. In the figure, reference numeral 1 is a print head, and a plurality of dot heads 2 having an equal distance L are arranged in a line. 3 is a flat platen, and the paper 4 on this platen 3
Is pressed by the print head 1 toward the platen 3 so as to be sandwiched between the print head 1 and the platen 3, and is fed in the direction of arrow A.

Reference numeral 6 is an angle adjusting mechanism for adjusting the angle of the print head 1 with respect to the paper feed direction A, and is for changing the inclination angle α from the position where the print head 1 is orthogonal to the paper feed direction A. 7 controls the angle adjusting mechanism 6 to set the inclination angle α of the print head 1 and notifies the print timing controller 8 of the angle information. The print timing control unit 8 detects the tilt angle α of the print head 1 and the relative position between the paper 4 and the print head 1 to control the print timing with each dot head 2 of the print head 1 and perform printing. Data is sent to the print head 1 for printing.

FIG. 2 is a comparison diagram of the print densities performed by the conventional printer and the printer of the present invention. In the figure,
The print density l ₁ of the print dots 9 in the case of the conventional printing device is equal to the distance L between the dots 2 as shown in (a). On the other hand, the printing density l ₂ of the printing dots 9 when the printing is performed by the printing apparatus of the present invention is l ₂ = LCos α as shown in (b).
Then, as the tilt angle α is increased, l ₂ is decreased and the print density is increased. This print density can be changed steplessly by continuously changing the inclination angle α.

Further, even when printing with a high print density for one line, for example, underline or ruled line is printed, if the print head 1 has an inclination angle α, printing of one dot row of the print head 1 is performed simultaneously. This is not performed (the number of dots that are simultaneously driven by the print head 1 is reduced). Therefore, the power capacity of the printing apparatus can be reduced. Further, this makes it possible to prevent a decrease in the printing speed due to the divided printing control of one dot row, and it becomes possible to perform high-speed printing.

[0010]

As described above, according to the present invention, since it has the function of changing the inclination angle of the print head,
It is possible to change the printing density, which increases the compatibility of the printing device. By giving the print head an inclination, it is possible to reduce the number of dots for batch drive of the print head, thereby reducing the power supply capacity of the printing device and increasing the printing speed because division printing control is unnecessary. effective.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a printing apparatus according to the present invention.

FIG. 2 is a comparison diagram of print densities when printing is performed by the conventional printing device and the printing device according to the present invention.

[Explanation of symbols] 1 print head 2 dot head 3 plane platen 4 paper 6 angle adjustment mechanism 7 angle control mechanism 8 print timing control unit 9 print dots

Claims (1)

[Claims] 1. An angle adjusting mechanism for adjusting an angle of the print head with respect to a sheet conveying direction in a printing device for printing on a sheet on a flat platen by a print head in which dot heads are arranged in a line, and the angle. A printing apparatus comprising: a print head angle control unit that controls an adjustment mechanism; and a print timing control unit that controls printing timing in accordance with the angle of the print head.