JPS604083A - Printer - Google Patents

Abstract

PURPOSE:To enable to insert an edge of a printing paper without jamming when inserting the paper into a printer, by retracting a paper end switch from a quide along which the printing paper is passed, in conjuction with a releasing mechanism. CONSTITUTION:At the time of releasing, when a releasing lever 4 is operated, a semicylindrical shaft is turned counterclockwise to push up a lever 20, and a lever 21 is also pushed up in conjuction therewith, so that the paper end switch 14 fitted to the tip of the lever 21 is also pushed up. Since the switch 14 is supported by a shaft 16, it is rotated counterclockwise with the shaft 16 as a center, so that a lever 15 is separated from upper and lower paper guides 13, 2, resulting in that nothing is present between the paper guides 13, 2, and the printing paper can be easily inserted. Accordingly, any thin paper can be inserted without being damaged, and when the releasing condition is cleared, the paper end switch can display its function.

Description

Detailed Description of the Invention Technical Field The present invention relates to a printing device, and more specifically, a paper end switch is linked to a release mechanism to avoid a guide through which the printing paper passes, thereby improving the insertion of the printing paper. The present invention relates to a printing device configured to improve the printing quality.

PRIOR ART FIG. 1 explains the paper feed error of a conventional printing device such as a typewriter. In the figure, the reference numeral 1 indicates the platen, which is cylindrical in shape, with an axis passing through its center. It is mounted so that it can be rotated through the 2 is a paper lower guide, which is wound around the platen 1 in a semi-cylindrical shape. The one indicated by reference numeral 3 has a mechanism in which a paper press roller passes through the paper lower guide 2 and presses the platen 1. The reference numeral 4 indicates a release lever, which is supported by a shaft 5. The reference numeral 6 is a rotation lever, which is adapted to rotate the semicircular shaft 7 in conjunction with the slider lever 4.

FIG. 2 is a side view for explaining the release mechanism of FIG. 1 in detail. In the figure, the same or corresponding parts as in FIG. 1 are denoted by the same reference numerals, and the explanation thereof will be omitted. In FIG. 2, reference numerals 9 and 10 indicate support shafts, and a lever 11 is provided around the support shaft 9, and a lever 12 is freely rotatable around the support shaft 10. The reference numeral 13 indicates a paper guide.

The tip end of the lever 11 is fixed to a support shaft 10, and the lever 12 is formed into a substantially U-shape, and the paper pressing roller 3 is rotatably supported at its upper end.

Further, a protrusion 12a protrudes from the rear end of the lever 12, and the protrusion 12a is a pin 11a that protrudes toward the lever 12 from the middle of the Leno C-11.

11b.

A spring 8 is stretched between the rear end of the lever 11 and the fixed part of the device, giving the <-11 the habit of rotating clockwise in the figure around the support shaft 9. There is.

Next, the operation of the conventional mechanism constructed as described above will be explained.

When the release lever 4 is not operated, the semicircular shaft I has its flat surface facing upward and is in a horizontal state.

For this reason, the lever 11 is rotated clockwise by the spring 8 which is obtained by cutting the semicircular shaft 7, and the lever 12 is moved in one direction via the support shaft 10, and the paper presser roller 3 is pressed against the recording paper. P is pressed against platen 1.

In this state, the protrusion 12a of the lever 12 is the pin 11a.

11b.

On the other hand, when the release lever 4 is rotated counterclockwise in FIG. 1, the semicircular shaft 7 is also rotated counterclockwise as shown in FIG. 3, and the pin 11b and the protrusion 12a are engaged. Lever 1
1 is rotated counterclockwise about the support shaft 9 against the tensile force of the spring 8.

As a result, the lever 12 is lowered via the support shaft 10, and the paper pressing roller 3 is separated from the platen 1 to be in the released state.

By the way, the conventional device having the above structure was provided with a paper end switch as shown in FIG. 14.

In FIG. 4, the reference numeral 14 is a paper end switch, and the reference numeral 15 is a detection lever, which penetrates the paper lower guide through each opening of the paper upper guide 13 and protrudes upward in a paper detection standby state. It is in. When the detection lever 15 is pressed, the paper end switch is turned on 9, and when the paper leaves the switch, it is turned off and paper can be detected.

Since the conventional paper end switch is configured as shown in Fig. 4, even if the paper presser roller 3 is in the released state,
When extremely thin paper or the like is inserted, the printing paper may succumb to the pressing force of the detection lever 15, resulting in paper edge jamming. In order to avoid this situation, it is possible to weaken the pressure on the detection lever 15, but in this case, the -C lever 15 may vibrate due to mechanical vibration of the printing device, etc., which may cause detection errors1. Purpose The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional printing system. The purpose is to provide equipment.

EXAMPLES Hereinafter, the present invention will be described in detail based on examples shown in the drawings. Figures 5 to 7 are for explaining one embodiment of the present invention, and in the figures, the same parts or corresponding parts as in Figures 1 to 4 are given the same reference numerals, and the explanation thereof will be omitted. .

FIG. 5 is a perspective view showing an embodiment of the present invention.
It is pivoted.

This shaft 16 is rotatably supported by a support plate 17 fixed on a device fixing part.

Reference numeral 18 denotes a support shaft, which supports one end of the lever 20. The other end of the lever 20 is rotatably connected to the lower end of the lever 21 via a support shaft 19.
A paper end switch 14 is fixed to the upper end of 1. The spring shown by 22 has one end attached to the lever 20 and the other end attached to the printing device, and the lever 20 is attached to the printing device side.

Therefore, as long as the release lever 4 is not operated, the flat part of the semicircular shaft 7 is recessed upward, and the lever 20° 21 is held by the spring 22.
The paper end switch 14 is pulled downward by the support plate 1.
The detection lever 15 is in contact with the stopper 23 on the top of the paper guide 7 to restrict clockwise rotation, and the detection lever 15 is fitted into the openings of the upper and lower paper guides 2 and 13 as shown by the solid line, and is in a detection standby state.

On the other hand, when releasing, operating release lever 4 will cause
It is semi-coaxially rotated counterclockwise to push up the lever 20, and in conjunction with this, the lever 21 is also pushed up, and the paper end switch 14 attached to its tip is also pushed up.

Since the paper end switch 14 is supported by the shaft 16,
The lever 15 rotates counterclockwise around the shaft 16, so that the lever 15 moves away from the upper and lower bays, <-guide 13°2, and moves to the seventh position.
As shown in the figure, there is no longer anything between the paper guide and the paper guide, making it easier to insert printing paper.

Since this embodiment is configured as described above, any thin paper can be inserted without damaging it, and when the release state is released, it can function as a paper end switch.

Effects As is clear from the above description, according to the present invention, an excellent effect can be obtained in that printing paper can be inserted into a printing device without jamming its edges.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional platen section, and FIG. 2 is a perspective view of a conventional platen section. Fig. 3 is a side view illustrating the release mechanism of a conventional paper presser roller. Fig. 4 is a side view illustrating the arrangement of a conventional paper end switch. Fig. 5 and subsequent figures show an embodiment of the present invention. Fig. 5 is a perspective view showing one embodiment of the present invention, and Fig. 6 is a perspective view showing an embodiment of the present invention.
7 are side views illustrating the set state and release state of the paper end switch. 1...Platen 2...Paper bottom guide! 3.
...Paper pusher roller 4...Release lever 7...Semicircular shaft 14...Paper end switch 15...Detection lever 2
0.21...shi'bar 22 ・Spring.

Claims (2)

[Claims] (1) In a printing device that includes a platen, a roller that presses the printing paper on the platen, and a paper end switch that detects the end of the printing paper, the paper end switch is connected to a release mechanism that releases the roller from the platen. A printing device characterized in that it is configured to avoid a paper guide through which printing paper passes. ÷ (2) One end of the paper end switch + is rotatably supported on one end of a link lever that is linked to the release mechanism, the other end is rotatably supported on one axis on the device fixing part, and the tip of the paper detection member is 2. The printing device according to claim 1, wherein the printing device is sized within a paper guide.