JPH04176679A - Paper interval adjusting mechanism of printer - Google Patents

Abstract

PURPOSE:To keep the same printing quality at all temps. and to enhance a printing head by changing the quantity of rotation of a stepping motor according to the temp. detected by the temp. sensor arranged in close vicinity of a platen. CONSTITUTION:Printing paper 2 is passed round a platen 1 and the surface temp. of the platen 1 is detected by the temp. sensor 3 arranged in close vicinity to the platen 1 and the stepping motor 6 directly connected to an eccentric shaft is rotated by the set quantity due to the temp. preliminarily programmed in a control part 4 and subsequently held. A carrier unit 7 is subjected to circular motion around a front shaft 8 by the rotation of the eccentric shaft 5 to control the interval between a printing head 9 and the printing paper 2. For example, temp. is preset to the control part 4 so that the quantity of rotation of the stepping motor 6 is reduced as temp. becomes high and the interval between the printing head 9 and the printing paper 2 is automatically controlled so as to be widened as temp. becomes high.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper gap adjustment mechanism for a printer, and more particularly to an adjustment mechanism for correcting GAP fluctuations due to temperature.

[Conventional technology]

Conventionally, this type of paper spacing adjustment mechanism has been manually adjusted when the spacing between the print head and the paper (hereinafter referred to as paper spacing) fluctuates due to temperature changes.

[Problem to be solved by the invention]

The conventional paper spacing adjustment mechanism described above manually adjusts paper spacing fluctuations due to temperature, so if printing is performed without adjustment, inappropriate paper spacing can cause deterioration of print quality and shorten print head life. It has the disadvantage of becoming.

[Means to solve the problem]

The paper spacing adjustment mechanism of the printer of the present invention is a paper spacing adjustment mechanism of a printer in which a single eccentric shaft passed through a carrier unit equipped with a print head is rotated by a stepping motor and then held. It is characterized in that the amount of rotation of the stepping motor is varied according to the temperature detected by the temperature sensor.

〔Example〕

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

FIG. 1 is a schematic plan view of an embodiment of the present invention.

Since the printing operation of the printer is well known, it will be omitted here. A printing paper 2 is placed on a platen 1.

The temperature of the platen surface is detected by a temperature sensor 3 placed close to the platen 1, and a stepping motor 6 directly connected to an eccentric shaft 5 is rotated and held by a set amount according to a temperature programmed in advance in a control part 4. The rotation of the eccentric shaft 5 causes the carrier unit 7 to perform a circular motion around the front shaft 8, thereby adjusting the distance between the print head 9 and the print paper 2. As a specific example, the controller 4 is set so that the rotation amount of the stepping motor 6 decreases as the temperature increases, and the interval between the print head 9 and the print paper 2 is automatically adjusted so as to increase as the temperature increases. Ru.

〔Effect of the invention〕

As explained above, the present invention has the effect of maintaining the same print quality at all temperatures and improving print quality by keeping the paper spacing constant at all temperatures.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Platen, 2...Print paper, 3...Temperature sensor, 4...Control unit, 5...Eccentric shaft, 6...
... Ste-sopping motor, 7... Carrier unit, 8... Front shaft, 9... Print head.

Claims (1)

[Claims] In the paper spacing adjustment mechanism of a printer, which holds a single eccentric shaft threaded through a carrier unit equipped with a print head after being rotated by a stepping motor, the stepping motor rotates according to the temperature detected by a temperature sensor located close to the platen. A paper interval adjustment mechanism for a printer characterized by varying the amount.