Title:
PLATEN GAP AUTOMATIC ADJUSTING DEVICE IN PRINTER
Document Type and Number:
Japanese Patent JP3019124
Kind Code:
B
Abstract:
PURPOSE: To automatically adjust the relative gap length between a platen and a recording head with high accuracy while preventing the generation of a dent on recording paper due to the contact with a carriage to the utmost.
CONSTITUTION: A stepping motor 5 moving a carriage loaded with a recording head in the vertical direction of a platen, a rotary encoder 12 having a detection mark provided to its circumference and outputting the quantity of rotation of a motor 5, that is, pulse signals in the number proportional to the moving quantity of the carriage and a time lag calculation means 22 moving the carriage from a reference position toward the platen to calculate the increment value of the time from the point of time when the driving pulse of the stepping motor 5 is generated to the point of time when the pulse signal from the rotary encoder 12 is generated are provided. A contact judging means 23 detecting that the increase value reaches a predetermined value is provided and, on the basis of the number of pulses of the rotary encoder 12 up to the point of time when a signal is outputted from the contact judging means 23, the thickness of paper is calculated by a paper thickness calculation means 24.
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Inventors:
Chibahara, Takashi
Application Number:
JP1993000111848
Publication Date:
January 07, 2000
Filing Date:
May 13, 1993
Export Citation:
Assignee:
SEIKO EPSON CORP
International Classes:
B65G1/00; B65G1/04; B65G1/06; B65G47/52; B65G47/88; (IPC1-7): B41J25/308; //H02P8/00