JPH0546448U - Sliding cardboard presser spring mechanism in CSF - Google Patents

Abstract

(57) [Summary] [Purpose] Always eliminate the gap between the platen and paper,
The print noise is suppressed and the LF pitch unevenness is reduced. [Structure] A paper pressing spring 10 is provided so as to be slidable along a direction connecting the platen 2 and the stacker roller 6, and the sliding amount of the paper pressing spring 10 can be changed to adjust the pressing force of the paper 1 against the platen 2. I chose

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a slide type cardboard pressing mechanism in an automatic paper feeding device capable of adjusting the pressing force of a paper against a platen.

[0002]

[Prior Art]

 FIG. 4 is a side view showing a configuration of a main part of a front sheet guide portion of an automatic sheet feeder (hereinafter referred to as CSF) in a conventional printer. In the printer shown in FIG. 4, the sheet 1 sent from the CSF rotates around the rear side (left side in the figure) and is wound around a part of the platen 2 in the printing unit, and is driven and driven by the platen 2. .. In this case, since the paper 1 is forcibly bent along the peripheral surface of the platen 2, a force to move away from the platen 2 acts. Therefore, the print head unit 3 is provided with a ribbon protector 5 for pressing the sheet 1 against the platen 2. Further, the sheet 1 printed in the printing section collides with the front sheet guide 4 provided above the printing section, and is guided to the stacker roller 6 by the front sheet guide 4 as shown by the dotted line, and further the stacker roller 4 is guided. It is configured to be conveyed to a stacker (not shown) by 6.

[0003]

[Problems to be solved by the device]

 However, in the above-described printer having the conventional structure, a force is exerted on the paper 1 that is forcibly wrapped around the platen 2 so as to separate from the platen 2. This force is not constant and varies depending on the type of paper 1, and is generally small for thin paper and large for thick paper and postcards. Therefore, it is ideal that the paper 1 that has passed through the print head unit 3 and the platen 2 travel straight to the stacker roller 6, but if a strong paper 1 such as thick paper or postcard is used, It will be driven in a state away from 2. For this reason, when printing is performed in a state of being separated from the platen 2, there is a problem (problem) that the printing sound becomes loud and the LF (line feed) pitch unevenness easily occurs, which deteriorates the printing quality.

The present invention has been made in order to solve the above problems, and its purpose is to always eliminate the gap between the platen and the paper, suppress the printing sound, and reduce the LF pitch unevenness. To provide.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a CSF that automatically feeds paper to a stacker roller side between a platen and a ribbon protector so that it can slide along a direction connecting the platen and the stacker roller. A paper holding spring having a guide portion that is provided and is capable of switching and adjusting the passage position of the paper after passing between the platen and the ribbon protector according to the slide amount with respect to the platen. The pressing force of the sheet against the platen can be adjusted by adjusting the switching position of the passage position by sliding the pressing spring.

[0006]

[Action]

 According to this configuration, when the paper pressing spring is slid according to the type of paper, the position of the paper passage after passing between the platen and the ribbon protector can be changed according to the slide amount, and at the same time, the position of the platen against the platen can be changed. The paper holding force can be adjusted. Therefore, regardless of the type of paper, it is possible to always eliminate the gap between the platen and the paper and hold the printing paper in close contact with the platen. As a result, it is possible to suppress the print sound to a low level and to eliminate LF pitch unevenness and the like.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 are diagrams showing a main configuration of a front sheet guide portion of a CSF in a printer to which the present invention is applied. 1 and 2, the same reference numerals as those in FIG. 4 denote the same as those in FIG. In the structure according to the embodiment of the present invention shown in FIGS. 1 and 2, and the conventional structure shown in FIG. It is provided.

More specifically, the paper pressing spring 10 is formed by press-molding an elastic plate material to form a first dogleg portion composed of a portion 10a and a portion 10b, a portion 10b and a portion 10c. A first inverted U-shaped portion, a second inverted U-shaped portion including the portions 10c and 10d, and a second inverted U-shaped portion including portions 10d and 10e. It will be done. Further, one end side of the paper pressing spring 10 is fixed to the front sheet guide 4, and the other end side thereof is freely extended to a position intersecting a paper passage passing between the platen 2 and the ribbon protector 5. The entire paper pressing spring 10 is arranged slidably along with the front sheet guide 4 along the direction connecting the platen 2 and the stacker roller 6. The sliding operation can be performed from the outside by the knob 20 mounted on the front sheet guide 4 in a state of penetrating through the long hole 31 formed in the operation panel 30 and protruding to the outside.

FIG. 3 is an operation explanatory diagram for adjusting the pressing force of the paper 1 against the platen 2 by sliding the paper pressing spring 10. Therefore, the operation will be described with reference to FIG. First, in this printer, the sheet 1 sent from the CSF goes around the rear side and is wound around a part of the platen 2, and is run with the platen 2 being driven and fed. Further, the paper 1 which has finished printing through the space between the platen 2 and the ribbon protector 5 in the printing portion comes into contact with the tip 10a of the paper pressing spring 10 and is guided to the platen 2 side by this portion 10b. Further, it is conveyed to the stacker roller 6 side by being attached to the portion of the guide portion 11 which is the bending boundary portion between the portion 10b and the portion 10c, and is then conveyed to the stacker (not shown) by the stacker roller 6. When the paper 1 to be used is strong such as thick paper or postcard, it tries to separate from the platen 2. Therefore, when using the paper 1 having such a high rigidity, the paper pressing spring is pushed through the knob 20. Slide 10 together with the front seat guide 4 to the arrow A side. Then, the position of the guide portion 11 is lowered, and the position of the sheet passage immediately after passing through the platen 2 and the ribbon protector 5 is brought closer to the platen 2 side, whereby the pressing force of the sheet 1 is strengthened. On the other hand, in the case of using a weak paper 1 such as thin paper, the paper pressing spring 10 is slid to the arrow B side together with the front seat guide 4 via the knob 20. Then, the position of the guide portion 11 is raised, and the position of the paper path immediately after passing through the platen 2 and the ribbon protector 5 is moved in a direction away from the platen 2, whereby the pressing force of the paper 1 is weakened. As shown in FIG. 2, this is at a position determined in advance depending on the type of paper 1, for example, at the position of "45 kg" when using 45 kg continuous amount of paper, and when using 55 kg continuous amount of paper. It is suitable for the paper 1 by moving the knob 20 to the position of "55 kg", the position of "70 kg" when using a continuous sheet of 70 kg, and the position of "postcard" when using a postcard. Pressing force can be obtained.

Therefore, according to the structure of this embodiment, regardless of the type of paper, the gap between the platen 2 and the paper 1 is always eliminated, and the paper 1 is closely attached to the platen 2 in the printing section. Can be held. As a result, it is possible to suppress the printing sound to a low level, and it is possible to improve the printing quality by eliminating LF pitch unevenness and the like.

[0011]

[Effect of the device]

 As described above, according to the slide type thick paper restraining spring mechanism in the CSF of the present invention, when the paper pressing spring is slid according to the type of paper, the paper passage after passing between the platen and the ribbon protector The position of can be changed according to the slide amount, and at the same time the paper pressing force on the platen can be adjusted. Therefore, regardless of the type of paper, the gap between the platen and the paper can always be eliminated, and the printing paper can be held in close contact with the platen. As a result, it is possible to suppress the printing sound to a low level and improve the printing quality by eliminating the LF pitch unevenness and the like.

[Brief description of drawings]

FIG. 1 is a side view of essential parts of a printer showing an embodiment of the present invention.

FIG. 2 is a front view of a knob operating portion of the printer shown in FIG.

FIG. 3 is a diagram for explaining an operation in one embodiment of the present invention.

FIG. 4 is a side view of a main part of a conventional printer.

[Explanation of symbols]

1 Paper 2 Platen 3 Print Head 5 Ribbon Protector 6 Stacker Roller 10 Paper Holding Spring 11 Guide

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Shinichi Nunorukawa 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A CSF that automatically feeds a sheet to a stacker roller side between a platen and a ribbon protector, wherein the CSF is slidable along a direction connecting the platen and the stacker roller. Accordingly, a sheet pressing spring having a guide portion capable of switching and adjusting the passage position of the sheet after passing between the platen and the ribbon protector with respect to the platen is provided, and the passage position by sliding of the sheet pressing spring. It is possible to adjust the pressing force of the sheet against the platen by adjusting the switching movement of the CSF.
Slide-type cardboard presser spring mechanism in.