JPH01208155A - Dot matrix printer - Google Patents

Abstract

PURPOSE:To increase a printing operation speed by thinning out the dots continuing a lateral direction, by thinning out data to be printed by logical operation. CONSTITUTION:An image data memory 1 storing the image data of one dot line, an operation part 2 takes the OR of the complement value of the image data of the n-th dot from the memory 1 and the image data of the (n+1)-th dot, a printing buffer 3 for storing the output data from the operation part 2 and a printing mechanism 4 for performing printing operation on the basis of the printing data from the printing buffer 3 are provided. In performing thinning out printing, the operation part 2 stores the data on and after the second dot in the printing buffer 3 according to a formula: printing data of (n+1)-th data=[printing data of n-th dot] X [printing data of (n+1)-th dot]. By this method, an image wherein dots in a lateral direction are thinned out every other dot is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dot matrix printer in which printed characters and the like are formed by a plurality of dots.

[Conventional technology] Conventional shuttle-type dot impact line printers are
The dot-printed characters are formed by reciprocating the carrier using the Shaol mechanism.

[The problem that the invention attempts to solve]

When attempting to print a vertical bar with a width of 2 dots by thinning printing for high-speed printing, a zigzag vertical bar will be printed.

[Means to solve the problem]

According to the present invention, a memory for storing image data for one dot line, an arithmetic means for performing a logical product of the complementary value of the n-th dot image data from the memory and the (n+1)-th dot image data, A dot matrix printer is obtained having a print data buffer for storing output data of the means.

〔Example〕

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

Referring to FIG. 1, one embodiment of the present invention includes an image data memory 1 that stores image data for one dot line, a complementary value of the n-th dot image data from the memory 1, and a (n+1)-th dot image data. It has an arithmetic unit 2 that performs a logical product with image data, a print buffer 3 that stores output data from the arithmetic unit 2, and a print mechanism 4 that performs a printing operation using the print data from the print buffer 3.

When performing normal printing, the calculation unit 2 outputs input data as output data as it is, as if performing any calculation. In this way, Figure 2 (a) without thinning out
Printing as shown in is obtained.

When performing thinning printing, the calculation section 2 stores data from the second dot onwards in the print buffer 3 according to the following equation.

(n+1)-th dot print data = [n-th dot print data × C(n+1)-th dot print data] According to the above formula, the image in Figure 2 (a>) is as shown in Figure 2 (
As shown in b), an image is obtained in which every other dot is thinned out in the horizontal direction.

[Effects of the Invention] As described above, according to the present invention, by thinning out the data to be printed using a logical operation, it is possible to thin out consecutive dots in the horizontal direction. This makes it possible to speed up the printing operation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a diagram showing printing results for explaining the operation of this embodiment. 1: Image data memory, 2: Arithmetic unit, 3: Print buffer, 4: Print mechanism. Agent Patent Attorney Oto Uchihara

Claims (1)

[Claims] a memory for storing image data for one dot line; a calculation means for performing a logical product of the complementary value of the n-th dot image data from the memory and the (n+1)-th dot image data; and an output of the calculation means. A dot matrix printer comprising a print data buffer for storing data.