JPH0499673A - Paper guide for serial printer - Google Patents

Abstract

PURPOSE:To prevent a print paper from springing out of a paper discharge guide, even under a state where the upper end of the print paper is slightly introduced into the paper discharge guide, and to improve the accuracy of line feed pitch by providing the paper discharge guide with a paper guide board comprising a paper guide coil spring. CONSTITUTION:A print head 4 and a paper guide 5 are mounted on a carrier 3. Upper end of a paper guide spring 7 comprising a coil spring is secured to the lower end of a paper discharge guide 6 in order to make correspondence with the paper guide 5 mounted on the carrier 3. Consequently, the leading end of a print paper 10 being guided by the paper guide 5 mounted on the carrier 3 is brought into contact with the inside of the paper guide spring 7 and held in place. When the carrier 3 is moved to the left end or the right end of the print paper 10 under that state, the print paper 10 begins to escape in the direction of an arrow B but the lower end of the paper guide spring 7 retains the leading end of the print paper 10 while deforming resiliently in the direction of an arrow A.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a paper guide device for a serial printer, and particularly to a paper guide for making it possible to print from the upper edge of printing paper in a serial printer. Regarding equipment.

[Conventional technology]

Conventional do-so-invacuum serial printers start printing 1/8 inch or 1/6 inch from the top edge of the printing paper, so there is a paper ejection guide above the platen. A device is provided, and each time one line of printing operation is completed, the carrier on which the print head is mounted is moved to near the center of the printing paper, the paper guide provided on the carrier is moved to the vicinity of the center of the printing paper, and then By causing the printer to perform a changeover operation, the printing paper can be guided by a paper guide provided on the carrier and smoothly led to a paper ejection guide fixed above the platen.

[Problem to be solved by the invention]

The paper ejection guide means of the conventional dot-impact serial printer as described above is such that when the carrier is moved to the left or right end of the printing paper in order to print the next line, the printing paper does not fully reach the paper ejection guide. When the paper has been introduced, you can start printing the next line without any problem, but if the printing paper is not fully introduced into the m paper ejection guide and only a small part of it is introduced, Due to residual deformation of the printing paper that was curved by the platen,
There is a problem that when the printing paper jumps out of the paper ejection guide and the printing operation of the next line is started, the line feed pitch becomes disordered.

[Means to solve the problem]

A paper guide device for a serial printer according to the present invention includes a paper ejection guide provided above a platen of a dot-in-back I-type serial printer in which a print head and a paper guide are mounted on a carrier, and an upper end at a lower end of the paper ejection guide. and a paper guide spring formed of a coil spring which is fixed and whose lower part #ii is free and projects below the lower edge of the paper guide.

Further, the paper guide device for a serial printer of the present invention includes a paper ejection guide provided above a platen of a dot impact type serial printer in which a print head and a paper guide are mounted on a carrier, and an upper end provided at a lower end of the paper ejection guide. The paper guide plate is formed of a thin plate of spring material, and has a fixed portion and a free lower end portion projecting below the lower edge of the paper guide.

C Example] Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a side view of the embodiment shown in FIG. 1, and FIG. 3 is a perspective view showing the operation of the embodiment shown in FIG. 1 when paper is introduced. It is a diagram.

In FIGS. 1 and 2, a print head 4 and a paper guide 5 are mounted on a carrier 3. In FIGS.

The carrier 3 is held movably in parallel to the platen 9 by a guide shaft 1 and a guide plate 2. A paper ejection guide 6 having an ejection roller 8 is provided above the platen 9 in order to eject the printing paper that is wound around the platen 9 and sent. The upper end of a paper guide spring 7 formed of a coil spring is fixed to the lower end of the paper ejection guide 6 in order to correspond to the paper guide 5 mounted on the carrier 3.
The lower end of the paper guide 5 side is free and protrudes below the lower edge of the paper ejection guide 6, allowing for elastic deformation.

In the paper guide device constructed in this manner, as shown in FIG. 3, the leading edge of the print paper 10 guided by the paper guide 5 mounted on the carrier 3 is held in contact with the inside of the paper guide spring 7. In this state, transfer carrier 3 to printing paper 1.
0, the printing paper 10 tries to escape in the direction of arrow B, but the lower end of the paper guide spring 7 elastically deforms in the direction of arrow A and moves the printing paper 1
Hold the 0 tip.

4 is a perspective view showing a second embodiment of the present invention, FIG. 5 is a side view of the embodiment shown in FIG. 4, and FIG. 6 is a perspective view showing the operation of the embodiment shown in FIG. 4 when paper is introduced. It is a diagram.

This embodiment has a similar structure to the first embodiment described above, and instead of the paper guide spring made of a coil spring, a paper guide plate made of a thin spring material is provided. As shown in FIGS. 4 and 5, the carrier 23 on which the print head 24 and the paper guide 25 are mounted,
It is supported movably in parallel to the platen 29 by a guide shaft 21 and a guide plate 22. A paper ejection guide 26 having an ejection roller 28 is provided above the platen 29 to eject the print paper that is wrapped around the two platens and sent. The upper end of a paper guide plate 27 formed of a thin plate of spring material is fixed to the lower end of the paper ejection guide 26 in order to correspond to the paper guide 25 mounted on the carrier 23. The lower end on the paper guide 25 side is free and protrudes below the lower edge of the paper ejection guide 26, allowing for elastic deformation.

In the paper guide device configured in this way, as shown in FIG. 6, the leading edge of the printing paper 10 guided by the paper guide 25 mounted on the carrier 23 is held in contact with the inside of the paper guide plate 27. In this state, transfer the carrier 23 to the printing paper 10.
When the paper guide plate 27 moves toward the left or right end, the printing paper 10 tries to escape in the direction of arrow B, but the lower end of the paper guide plate 27 holds the leading edge of the printing paper 10 while being elastically deformed in the direction of arrow A.

〔Effect of the invention〕

As explained above, the paper guide device for a serial printer of the present invention has a paper guide spring formed of a coil spring or a paper guide plate formed of a thin plate spring material in the paper ejection guide, so that the top edge of the printing paper is fixed. Even in the state where it is slightly introduced into the paper ejection kite,
This has the effect of preventing the print paper from flying out of the paper ejection guide, and therefore improves the precision of the line feed pitch.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention, and FIG. 2 is the actual structure of FIG. 1! FIG. 3 is a perspective view showing the operation of the embodiment shown in FIG. 1 when paper is introduced, FIG. 4 is a perspective view showing the second embodiment of the present invention, and FIG. FIG. 6 is a side view of the embodiment of FIG. 4, and FIG. 6 is a perspective view showing the operation of the embodiment of FIG. 4 when paper is introduced. In the figure, 1.21... Guide shaft, 2.22...
...Guide plate, 3.23...-Carrier,
4・24・・・Print head, 525・・・・Paper guide, 6・26・・・・Paper ejection guide, 7・・・
... Paper kite spring, 8-28 ... Ejection roller, 9, 29 ... Platen, 10 ...
-...Printing paper, 27...-Paper guide board.

Claims (1)

[Scope of Claims] 1. A paper ejection guide provided above the platen of a dot impact type serial printer in which a print head and a paper guide are mounted on a carrier, and a lower end with an upper end fixed to a lower end of the paper ejection guide. A paper guide device for a serial printer, comprising a paper guide spring formed of a coil spring whose portion is free and projects below the lower edge of the paper guide. 2. A paper ejection guide provided above the platen of a dot-impact serial printer in which a print head and a paper guide are mounted on a carrier; A paper guide device for a serial printer, comprising a paper guide plate formed of a thin plate of spring material that projects below the lower edge of the paper guide.