JPH028077A - Automatic paper thickness regulation mechanism of printer - Google Patents

Abstract

PURPOSE:To prevent dispersion of a clearance between a printing mechanism part and a platen and to prevent printing stain in printing, feed inferiority of paper, and lack of printing by a method wherein a sensor lever is made to abut against the printing mechanism part via use paper and a position of the sensor lever is detected with a sensor so as to be constant. CONSTITUTION:Printing paper 3 to be used is pinched between a printing mechanism part 1 and a sensor lever 2. A sensor 4 detects whether the sensor lever 2 slips out from a normal position or not under this state and outputs a detection signal to a controller 13. The controller 13 receives the signal from the sensor 4 and judges whether a position of the sensor layer 2 is normal or not. When the position slips out, a carrier 5 is rotated around a support axle 6b by driving a motor 9, and the sensor lever 2 is pressed down with the printing mechanism part 1 monitoring the output from the sensor 4 to regulate its position. When the position of the sensor lever 2 is regulated to the normal position, registration of the printing mechanism part 1 to a platen 11 corresponding to the printing paper to be used comes to be carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer, and particularly to a mechanism for automatically adjusting the gap between the side of the printing machine and the platen for each paper thickness used.

[Conventional technology]

The automatic paper thickness adjustment mechanism of a conventional printer has an 81 structure using a rotary motor, gears, and eccentric bushings.

Each time the thickness of paper used changes, the above mechanism is used to directly press the printing mechanism against the paper, and then move the printing mechanism aside by a certain amount to adjust the gap to the platen to perform printing.

[Problem to be solved by the invention]

In the above-mentioned conventional automatic paper thickness i structure, the printing mechanism section is retracted after being pressed directly against the paper, so the retraction position of the printing mechanism section is unstable depending on the paper being used, and the printing mechanism section and the platen are Disadvantages include the occurrence of variations in the gap, staining of the paper during printing, poor paper feeding, and the occurrence of missing prints.

An object of the present invention is to provide an automatic paper thickness adjustment 81 for a printer that solves the above problems.

[Means to solve the problem]

In order to achieve the above object, the automatic paper thickness adjustment mechanism of the printer according to the present invention includes a control means for changing the position of the printing mechanism section with respect to the platen of the printer, and a control means for changing the position of the printing mechanism section with respect to the printer's platen, and a control means for sandwiching the printing paper to be used and adjusting the printing mechanism section. changing the position of the printing mechanism by a sensor lever that comes into elastic contact with the sensor lever and the adjusting means;
A control means for controlling the position of the printing mechanism relative to the platen in accordance with the thickness of the printing paper by pressing down the sensor lever through the printing paper in the printing mechanism section and fixing the sensor lever at a preset position. It has the following.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, two support shafts 6a and 6b are laid in parallel along the platen 11 extending in the vertical direction in the figure, and printing e.
l! One support shaft 6b is directly inserted into the carrier 5 mounted on the side of the ellipse, and the other support shaft 6a is inserted through the eccentric bushing 7.
It is rotatably supported around b in the direction of the arrow, and
Support shaft 6a.

6b so as to be able to reciprocate. Further, the gear 8 of the support shaft 6a is meshed with the gear 10 of the motor 9.

Here, an adjusting means for changing the position of the printing mechanism section 1 with respect to the platen 11 is configured with the above-mentioned configuration.

Further, the sensor lever 2 is rotatably supported around a shaft 2a, and the sensor lever 2 is pulled by a spring 12 so that the sensor lever 2 is elastically moved through the printing paper 3 used in the printing mechanism section 1. Let them come into contact with you. Furthermore, it is provided with a sensor 4.4 that detects whether or not the sensor lever 2 is fixed at a preset position regardless of the type of printing paper 3 used, and the sensor 44 is connected to a controller (control means) 13. death,
The motor 9 is connected to the output side of the controller 13.

In the embodiment, the printing paper 3 to be used is sandwiched between the printing mechanism section 1 and the sensor lever 2. In this state, sensor 4
detects whether the sensor lever 2 is deviated from the normal position and outputs the detection signal to the controller 13. The controller 13 receives the signal from the sensor 4 and determines whether the position of the sensor lever 2 is the normal position.
If it is misaligned, drive the motor 9 to rotate the carrier 5 angularly around the support shaft 6b, and while monitoring the output from the sensor 4, press down the sensor lever 2 with the print mechanism 1 to determine the position. adjust. When the position of the sensor lever 2 is adjusted to the normal position, the horizontal portion 1 of the printing machine is positioned with respect to the platen 11 corresponding to the printing paper 3 to be used.

〔Effect of the invention〕

As explained above, in the present invention, the printing machine side part and the platen are in contact with each other through the printing paper, and the printing machine side part and the platen are detected by a sensor so that the position of the sensor lever is kept constant. It has the effect of preventing variations in the gap and preventing print smudges, poor paper feeding, and missing prints during printing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. l... Printing mechanism section 2... Sensor lever 3...
・Print paper 4...Sensor 5...Carrier
6a...Support shaft 6b...Support shaft 7.
...Eccentric bushing 8...Gear 9...Motor 10...Gear 11...Platen 1
2...Spring

Claims (1)

[Claims] (1) An adjusting means for changing the position of the printing mechanism with respect to the platen of the printer, a sensor lever that pinches the printing paper to be used and makes elastic contact with the printing mechanism, and changing the position of the printing mechanism by the adjusting means. , control for controlling the position of the printing mechanism relative to the platen in accordance with the thickness of the printing paper by pressing down the sensor lever through the printing paper in the printing mechanism section and fixing the sensor lever at a preset position; An automatic paper thickness adjustment mechanism characterized by having means.