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Printer apparatus
| Details |
Inventors: Suzuki, Michio;
Assignee: Tokyo Electric Co., Ltd. (Tokyo, JP)
Primary Examiner: Evans; Arthur G.
Assistant Examiner:
Attorney, Agent or Firm: Frishauf, Holtz, Goodman & Woodward
A printer apparatus is provided with a frame memory for storing a printing pattern, a printing head driven in accordance with the printing pattern stored in the frame memory, and a processor for producing a plurality of graphic patterns in the frame memory in accordance with a plurality of items of printing data which are externally supplied, to thereby form a printing pattern. The processor of the printer apparatus includes a buffer memory and a CPU. The buffer memory stores image distribution data indicating a frame memory area which is occupied by the image portion of the graphic pattern corresponding to printing data to be changed and from which the marginal portions of the graphic pattern is excluded. When printing data which should be used in place of the printing data to be changed is supplied, the CPU reads the image distribution data relating to the printing data to be changed out of the distribution data memory, and clears the frame memory area specified by the image distribution data. |
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DETAILED DESCRIPTION Accordingly, an object of the present invention is to provide a printer apparatus which prints an image corresponding to items of printing data without causing any loss around a character portion in the image even if the printing data for the character portion is changed or updated.
To achieve this object, the present invention provides a printer apparatus which comprises a frame memory for storing a printing pattern, a printing head driven in accordance with the printing pattern stored in the frame memory, and processing circuit for producing a plurality of graphic patterns in the frame memory in accordance with a plurality of items of printing data which are externally supplied, to thereby form a printing pattern, wherein the processing circuit includes a distribution data memory for storing image distribution data indicating a frame memory area which is occupied by an image portion of a graphic pattern corresponding to the printing data to be changed and from which marginal portions of the graphic pattern is excluded, and area-releasing circuit, responsive to the supply of printing data which should be used in place of the printing data to be changed, for reading image distribution data relating to the printing data to be changed, out of the distribution data memory, and for clearing the frame memory area specified by the image distribution data.
The printer apparatus of the present invention operates as follows.
In the case where a printing pattern is to be partly changed, the frame memory area used for storing the image portion of the graphic pattern corresponding to the printing data (the image portion being a portion obtained by excluding the marginal portions from the graphic pattern), is cleared.
Thus, even if the graphic pattern is set to be larger than an ordinary size, with its marginal portions overlapping the frame memory area in which a pattern of a ruled line is stored, the pattern of the ruled line is prevented from being undesirably erased when the graphic pattern of new printing data is stored in the frame memory
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