JPS60159080A - Printer - Google Patents

Abstract

PURPOSE:To eliminate the skew of the paper end SW by a lever and a paper guide by fixing plural paper guides at an equal distance from left and right end portions according to the size of the paper at the paper rest. CONSTITUTION:A paper 15 is sent into a paper guide 4 and a guide 12 by an automatic paper feeder. The same resistance as the resistance to be given to the paper 15 by the paper guide 1 is given at symmetrical positions by the paper guide 12. The paper 15 is sent to a tapered pan 6, where the end 7A of a lever 7 is pressed by the paper 15, and the key 10A of a paper end switch 10 is pressed by the other end 7B to turn the paper end switch 10 ON. The paper 15 is wound around a platen 2 and printed by a printing head 9. The paper 15 so printed is further moved, and when it passes through the end 7A of the lever 7, the pressing of the paper 15 on the lever 7 is released. The paper can thus be fed without causing any skew.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a paper guide for a printer.
In particular, it relates to a printer that eliminates paper skis.

[Technical background of the invention]

In a conventional printer, as shown in FIGS. 1 to 3, a rectangular paper rest 3 is stretched parallel to the longitudinal direction of a cylindrical platen 2. The paper guide 4 has a rectangular shape, has a mounting hole for attaching the paper rest 3 in the upper part, and has a concave cutout 4A in a vertical direction in the lower part. This paper guide 4 is attached to the bent portion of the paper rest 3 with screws or the like. An arc-shaped taper pan 6 is provided on the outer periphery of the platen 2 to wind the paper 5 around the platen. An insertion hole 6A for an inverted lever 7 is bored in the lower part of the paper guide 4 of the tapered pan 6. At the bottom of the platen 2 of the taper pan 6, insertion holes 6B and 6C for the friction roller 8 are formed. An insertion hole 6D for the print head 9 is formed on the opposite side of the tapered pan 6 from the paper guide 4. The lever 7 is in the shape of an inverted rod, and at least its upper end is slanted to facilitate conveyance of paper.

One end 7A of the lever 7 moves up and down between the concave notches 4A of the paper guide 4, and the other end 7B has a paper end switch (5W) installed below the lever 7.
is in contact with. Friction roller 8 clamps paper 5 together with platen 2, rotates platen 2, and sends paper 5 in the direction of the arrow. The print head 9 presses the paper 5 when it is sent to a position facing the print head on the platen 2 to perform printing.

As shown in FIG. 2, when paper 5 is fed between guide 1 and tapered pan 6, paper 5 presses end 7A of lever 7. As shown in FIG. End 7fl of lever 7:
Press part 10A of paper end switch 1o,
Turn on the paper end switch. The paper 5 is held between the platens 2 and 7 and is moved in the direction of the arrow, and is printed by the print head 9. As shown in FIG. 3, when the end 5A of the paper 5 passes the end 7A of the lever 7, the end 7B of the lever 7, which had been suppressed by the paper 5, depresses the key part 10A of the paper end switch 1o. solve. As a result, the paper end switch 10 is turned off, the paper end is detected, printing is stopped, and the paper 5 is ejected.

[Problems with background technology]

However, when such a paper guide 1 uses a cut sheet of paper in an automatic paper feeder, the lever 7 and the paper guide 1 partially provide resistance to the paper 5, so the paper 5 rotates around that point as a fulcrum and generates skidding. I let it happen.

[Purpose of the invention]

The present invention has been made in view of these problems, and an object of the present invention is to provide a printer that eliminates skew caused by the lever of the paper end switch and the paper guide.

[Summary of the invention]

In a printer, there is a paper rest stretched parallel to the longitudinal direction of the platen, a tapered pan that surrounds the platen and forms a conveyance path for paper sheets, and the upper part of the paper rest is attached to the paper rest, and the lower part hangs down toward the tapered pan side. A paper guide with a U-shaped recess, and one end of which is located in the recess of the paper guide and is pushed down by the passing paper sheet.
Detects the vapor end of the mold/<-(!:, It has a paper end switch fixed to the other end of the paper end detection lever of the reverse Lm, and the paper end is fixed to the paper rest from the left and right ends depending on the size of the paper. The above objective was achieved by fixing multiple paper guides at a distance.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

The same reference numerals as in the previous figures indicate the same members.

The printer 1' of the present invention, as shown in FIG. 4, has, in addition to the conventional paper guide 4, paper guides 12, 13, and 14 having the same shape and size as the paper guide 4.

Like the paper guide 4, the paper guide 12 has a mounting hole in the upper part and a U-shaped recessed part in the vertical direction in the lower part.

The paper guide 12 is installed to prevent skewing when using narrow paper 15. When the paper 15 passes through the paper guide 4 and the paper guide 12, the paper guide 12 is applied to the paper 15 so that the resistance that the paper guide 4 gives to the paper 15 and the resistance that the paper guide 12 gives to the paper 15 are the same. When the paper 15 attached to the paper rest 3 is installed in the tapered pan 6 in a position symmetrical to the paper guide 4, the distance between the right end of the paper 15 and the right end of the paper guide 4 is adjusted, and the left end of the paper 15 is adjusted. Letting the distance between the left end of the paper guide 12 and the left end of the paper guide 12 be L2, the position becomes L1=L2. Also, screwing the paper guide 12 to the paper rest 3 slightly reduces the resistance that the paper guide 12 gives to the paper 15.
The angle at which the paper guide 12 contacts the paper 15 can be adjusted for fine adjustment.

The paper guide 13 is applied to a paper 16 that is slightly wider than the paper 15. Place paper 16 in tapered pan 6
If the distance between the right end of the paper 16 and the right end of the paper guide 4 is Ll, and the distance between the left end of the paper 16 and the left end of the paper guide 13 is L3, then the paper guide 13 is placed at a position where L, =L. is attached to Benoku-Rest 3.

The paper guide 14 is applied to a paper 17 which is wider than the paper 16. When paper 17 is placed in the paper pan 6, the distance between the right end of the paper 17 and the right end of the paper guide 4 is L, and the distance between the left end of the paper 17 and the left end of the paper guide 14 is L4, then L1=L4 A paper guide 14 is attached to the paper rest 3 at a position where .

Next, the operation of the present invention will be explained.

Paper 15 is fed from guide 11 to paper guide 4 and guide 12 by an automatic paper feeder. As shown in FIG. 5, the paper guide 12 provides the same resistance to the paper 15 as the resistance that the paper guide 1 provides to the paper 15 at a symmetrical position. Therefore, the paper 15 is sent to the paper 15 without causing any skew. Paper 1
5 is sent to the taper pan 6, the paper 15 presses the end 7A of the lever 7 as shown in FIG. 1. Turn on the end switch 10.

The paper end switch 10 detects that the paper 15 has been fed.

Next, the paper 15 is wrapped around the platen 2 and the print head 9
It will be printed. After printing, the paper 15 moves further, and as shown in FIG.
When the paper 15 passes through the end 7A of the paper 15, the pressure on the lever 7 is released. As a result, the suppression of the end portion 7B of the lever 7 against the opening portion 10A of the paper end switch 10 is released. [vapor end switch] becomes 1t OFF state, detects the paper end, stops printing, and prints paper 1.
Eject 5.

Similar to the paper guide 12, the paper guides 13 and 14 also feed the sheets 16 and 17 without causing skew.

〔Effect of the invention〕

As explained above, by using the present invention, it is possible to eliminate the skew that occurs when the paper rotates around the clamping portion between the paper guide and the lever as a fulcrum, which is highly effective.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional printer, Figure 2 is a sectional view taken along line AA' in Figure 1 while paper is passing through the paper guide, and Figure 3 is a cross-sectional view of Figure 1 after paper has passed through the paper guide. 4 is a perspective view of the printer of the present invention, FIG. 5 is an explanatory diagram of the operation when paper is fed to the paper guide of the printer of the present invention, and FIG. 6 is a diagram of the printer of the present invention. FIG. 7 is an explanatory diagram of the operation while paper is passing through the paper guide of the printer of the present invention, and FIG. 7 is an explanatory diagram of the operation after the paper has passed through the paper guide of the printer of the present invention. 1.1'... Printer 2... Platen 3... Paper rest 4.12.13.1.4... Paper guide 6.1.
Taper pan 711. Lever 8...7 Reaction roller 9...Print head 10...Paper end switch 11...Guide

Claims (1)

[Claims] In a printer, there is a paper rest stretched parallel to the longitudinal direction of the platen, a tapered pan that surrounds the platen and forms a conveyance path for paper sheets, and a tapered pan whose upper part is attached to the paper rest and which hangs down to the tapered pan side and whose lower part is coated. Paper end detection using a first paper guide having a letter-shaped recess and a paper end detection lever having one end located in the recess of the first paper guide and being pushed down by a passing paper sheet. a paper end switch fixed to the other end of the lever, and a paper end switch on the paper rest at a distance from the other end of the paper equal to the distance from one end of the paper to the first paper guide depending on the size of the plurality of papers. 1. A printer comprising: a plurality of second paper guides fixed at positions.