JP3329375B2 - Paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device such as an ink jet printer.

[0002]

2. Description of the Related Art A conventional printer is disclosed in
There is one described in Japanese Patent Application Laid-Open No. 2-21662. As shown in FIG. 5, a deflector 3 is arranged along the outer peripheral surface of a platen 2 facing the printing unit 1, and a pair of front and rear swing arms 5 that can swing around a shaft 4 is provided. The feed roller 6 is rotatably provided, and presses both feed rollers 6 against the outer peripheral surface of the platen 2 via the swing arm 5 by the leaf spring 7.

In the above configuration, the paper P is supplied between the platen 2, the deflector 3, and the feed roller 6,
The paper P is fed at a predetermined pitch by the intermittent rotation of the feed roller 6, and printing is performed on the paper P by the printing unit 1.

[0004]

In the above-mentioned conventional configuration,
When the paper P is fed, static electricity is generated on the platen 2, the deflector 3, and the feed roller 6 that come into contact with the paper P, and the static electricity flows to the printed circuit board to generate noise, thereby causing a malfunction.

Therefore, it has been considered that the platen 2 and the feed roller 6 are formed of conductive rubber to discharge static electricity from the platen 2 and the feed roller 6 to the chassis side, but this requires a high manufacturing cost. .

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described conventional drawbacks, and has as its object to provide a paper feeding device capable of releasing static electricity generated when paper is fed and fed to a chassis with a low-cost and simple structure. And

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a paper is supplied to a paper feed port of a housing, and a paper feed roller which contacts the paper is rotated. In a paper feeder configured to supply the sheet between a feed roller and a deflector with a holding roller and feed the sheet at a predetermined pitch by intermittent rotation of the feed roller, the deflector is attached to a chassis. And a pressing plate made of an elastic metal plate attached to the deflector main body. The pressing plate is bent from both sides of the pressing plate main body and the pressing plate main body arranged along the sheet facing surface of the deflector main body. And a pair of engaging pieces engaged on both side surfaces of the deflector body, and extending from the holding plate body along the spring engaging portion of the deflector body. Consists length portion Prefecture, spring is stretched between the chassis and the extension portion and the spring engagement portion, Fi
The holding plate and the
The pressing roller is formed so as to escape to the chassis through a spring, and the pressing roller is projected outside through an opening window of the pressing plate body.

According to the above configuration, the static electricity generated when the paper is fed is released to the chassis via the holding plate and the spring. Therefore, noise caused by the static electricity is prevented, and the malfunction is caused. Can be eliminated, and the holding plate only needs to be elastically brought into contact with the paper, so that the configuration is simple and the manufacturing cost can be reduced.

Further, since the holding plate also serves as the ground plate, the number of parts does not increase, and the manufacturing cost can be reduced.

Further, when the end of the spring is engaged with the spring engaging portion of the deflector body, the end of the spring is also engaged with the extension of the holding plate, so that the spring is moved from the extension through the spring. To release static electricity to the chassis.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an ink jet printer provided with a paper feeding device according to an embodiment of the present invention. A paper feeding port 11 is formed at a rear portion of a housing 10 and a paper discharging port is formed at a front surface thereof. 12 are formed and the housing 10
A paper feed roller 14, a feed roller 15, and a paper discharge roller 16 are provided therein, and are movably supported by a guide shaft 17 and a chassis 18 disposed at an upper portion in the housing 10. A print head 22 and an ink tank 23 are mounted on a carriage 21 that is reciprocated through a platen. A platen 24 is provided to face the print head 22. A deflector 26 with a plurality of pressing rollers 25 facing the feed roller 15 1
The deflector 26 includes a deflector body 27 and a pressing plate (earth plate) 28 attached to the deflector body 27. Reference numeral 29 denotes a press roller that comes into contact with the paper discharge roller 16, and reference numeral 30 denotes a paper feed tray rotatably disposed in the paper feed port 11, which is urged toward the paper feed roller 14 by a spring 31.

In the above configuration, by setting the paper P on the paper feed tray 30, the paper P is pressed against the paper feed roller 14 by the spring 31, and in this state, the paper feed roller 14 is turned on based on the print command signal. Is rotated, and only one sheet of paper P on the sheet feed tray 30 is sent out between the feed roller 15 and the deflector 26, and the feed roller 1
5, the paper P is fed at a predetermined pitch by the intermittent rotation, and is printed on the paper P by the print head 22.
Is discharged from

The deflector body 27 is shown in FIGS.
As shown in FIG. 4, a substantially L-shaped pivoting piece 33 made of a hard synthetic resin material and having a substantially rectangular shape in a plan view and extending obliquely forward from the upper surface thereof, and a pair of brackets 34a extending rearward from the rear end thereof, And a pair of left and right locking pins 36 protruding from appropriate ones of a plurality of ribs 35 extending in the front-rear direction provided on the outer peripheral surface and having a shaft portion 34b provided between the two brackets 34a. And the pivot piece 33 provided on the bottom plate 18a of the chassis 18
7, a spring 39 is attached to the shaft portion 34b of the spring engaging portion 34 and the convex portion 38 provided on the side wall portion 18b of the chassis 18.
By engaging the opposite ends of each of the above, each of the locking pins 36 is brought into contact with a pair of stoppers 40 extending rearward from the side wall portion 18b of the chassis 18, thereby maintaining a predetermined paper holding posture (FIG. 1). reference).

As shown in FIGS. 2 to 4, the pressing plate 28 is made of an elastic metal plate, and is disposed along the sheet facing surface of the deflector main body 27. A pair of engaging pieces 28b bent at right angles from both side edges, and the engaging holes 42 penetrating through the respective engaging pieces 28b are engaged with the projections 43 projecting from both side faces of the deflector body 27. By doing so, it is attached to the lower surface of the deflector body 27.

An extension 28c extending from the holding plate main body 28a to the spring engagement portion 34 is provided.
The end of the spring 39 is engaged with a through hole 44 formed at the tip of 8c.

According to the above configuration, the static electricity generated when the paper P is fed is released to the chassis 18 via the holding plate 28 and the spring 39, so that noise due to the static electricity can be prevented. Therefore, the cause of the malfunction can be eliminated, and since the existing holding plate 28 and spring 39 are used, the number of parts does not increase and the manufacturing cost can be reduced.

As shown in FIGS. 2 to 4, a pair of holding rollers 25 provided on the deflector 26 are housed in housing recesses 46 formed at the front of the deflector body 27. While the shaft portion 25a is fitted in the concave groove 47 formed on the lower surface of the deflector main body 27, it is supported by the pressing plate main body 28a so as not to come out of the concave groove 47.
The lower part of 5 protrudes slightly from the opening window 48 of the holding plate main body 28a to the outside.

In the above embodiment, the deflector 26
The static electricity is released to the chassis 18 by using the pressing plate 28 and the spring 39 of the printer. However, in a printer that does not use the deflector 26, an earth plate is provided on the chassis 18 so as to face the feed roller 15, and the earth plate is What is necessary is just to elastically contact P.

Although an ink jet printer has been described as an example, the present invention is not limited to this, and can be applied to, for example, a laser printer.

[0020]

According to the first aspect of the present invention, static electricity generated when the paper is fed is released to the chassis via the holding plate and the spring, so that noise due to the static electricity is prevented. As a result, the cause of the malfunction can be eliminated, and the holding plate only needs to be elastically brought into contact with the sheet, so that the configuration is simple and the manufacturing cost can be reduced.

Further, since the holding plate also serves as the ground plate, the number of parts does not increase, and the manufacturing cost can be reduced.

Further, when the end of the spring is engaged with the spring engaging portion of the deflector body, the end of the spring is also engaged with the extension of the holding plate, so that the spring is extended from the extension through the spring. To release static electricity to the chassis.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an ink jet printer including a sheet feeding device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the main part.

FIG. 3 is a perspective view of the holding plate.

FIG. 4 is a plan view of the main part.

FIG. 5 is a side view of a main part showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Case 11 Paper feed port 15 Feed roller 25 Press roller 26 Deflector 27 Deflector main body 28 Press plate (earth plate) 28a Press plate main body 28b Engagement piece 28c Extension part 31 Spring 33 Pivot piece 34 Spring engagement part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 1/00-3/68 B65H 5/00

Claims (1)

(57) [Claims] 1. A sheet is supplied to a paper supply port of a housing, and the paper is supplied between a feed roller and a deflector with a holding roller by rotating a paper supply roller that comes into contact with the paper. In a paper feeder configured to feed paper at a predetermined pitch by intermittent rotation of a roller, the deflector includes a deflector body attached to a chassis, and a pressing plate made of an elastic metal plate attached to the deflector body. A presser plate, a presser plate body disposed along the sheet facing surface of the deflector body, a pair of engaging pieces bent from both side edges of the presser plate body and engaged with both side surfaces of the deflector body, An extension extending from the plate body along the spring engagement portion of the deflector body, between the extension and the spring engagement portion and the chassis. A spring is stretched to feed
The static electricity generated at this time is shielded through the holding plate and the spring.
A sheet feeding device formed so as to escape to a chassis, wherein the pressing roller is projected outside from an opening window of a pressing plate body.