JPH07125359A - Printer - Google Patents

Abstract

PURPOSE:To reduce the noise by decreasing a quantity of the noise leaking through a delivery port, by a method wherein a paper guide guiding so that paper which is in a delivery process is brought into sliding contact with an edge part positioning at a printing head side of a delivery port is provided. CONSTITUTION:A delivery tray 19 constitutes a paper guide and guides paper P1 which is in a delivery process so that the paper P1 makes slide contact with an edge part 18a positioning at a printing head 17 side of a delivery port 18. Since the paper P1 which is in the delivery process is guided by the delivery tray 19 so that it makes sliding contact with the edge part 18a positioning at the printing head 17 side of the delivery port 18 by the delivery tray 19 like this, such a gap made in a conventional printer between paper and an edge positioning at the printing head side of the delivery port is clogged by the paper. In other words, a space S in which a noise is emitted becomes a closed state by an upper case 12, a cover 13 and the paper P1 which is in the delivery process. Therefore, a leaking quantity to the out side of cases 12a, 13a of the noise to be produced by the head 17 is reduced remarkably.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to printers. In particular, the present invention relates to a printer in which noise is reduced by improving the paper discharge structure.

[0002]

2. Description of the Related Art FIG. 4 is a schematic side view showing an example of a conventional printer.

In FIG. 1, reference numeral 1 denotes a printer case. In the case 1, a platen 2 around which a paper P is wound, a print head H arranged so as to face the platen 2, and a print head are provided. And a paper discharge roller pair 3 for discharging the paper P printed by.

The paper discharge roller pair 3 comprises a driving roller 3a and a driven roller 3b.

The case 1 is provided with a paper discharge port 4.

According to such a printer, the platen 2
The paper P that is wound around and is printed by the print head is conveyed by the paper discharge roller pair 3 and is discharged from the paper discharge port 4 to the outside of the case 1.

[0007]

Generally, in the printer as described above, the print sound of the print head H is a source of noise. In particular, when the print head is a wire dot type head, the noise of the wire is also large because the wire collides with the paper. On the platen 2 side, this noise is absorbed by the platen 2 itself, and therefore is mainly generated on the head H side.

In the above-described conventional printer, the sheet P in the discharging process and the edge portion 4a of the sheet discharge port 4 located on the print head H side are open, so that noise leaking from this gap is generated. There was a problem that the amount was large.

An object of the present invention is to solve the above problems, and to provide a printer capable of reducing the amount of noise leaking from a paper discharge port and reducing the noise.

[0010]

In order to achieve the above object, a printer according to a first aspect of the present invention discharges a sheet printed by a print head provided in a case from a sheet discharge port provided in the case. The printer is provided with a paper guide for guiding the paper in the process of discharging so that the paper is brought into slidable contact with the edge of the paper discharge port located on the print head side.

According to a second aspect of the present invention, in the printer according to the first aspect, the paper guide is composed of a paper discharge tray for supporting the discharged paper.

According to a third aspect of the present invention, the printer according to the first or second aspect is characterized in that the paper discharge port is provided at an intersection of an upper surface and a rear surface of the case.

[0013]

According to the printer of the first aspect, the sheet printed by the print head provided in the case is discharged from the sheet discharge port provided in the case.

Then, the paper in the process of being discharged is guided by the paper guide so as to be in sliding contact with the edge portion of the paper discharge port located on the print head side.
The gap between the paper and the edge of the paper ejection port located on the print head side is closed by the paper.

Therefore, according to this printer, the amount of noise is remarkably reduced.

According to the printer described in claim 2, in the printer described in claim 1, since the paper guide is composed of a paper discharge tray for supporting the discharged paper, it is necessary to provide a separate paper guide. Disappear. In other words, it is possible to obtain the above-mentioned action while supporting the discharged paper by the paper discharge tray.

According to a third aspect of the present invention, in the printer according to the first or second aspect, since the paper discharge port is provided at the intersection of the upper surface and the rear surface of the case, the discharge is generated by the print head. Generated noise is sent toward the rear of the printer, and in combination with the above action,
Generally, the noise on the front side of the printer where the user is located is further reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway side view showing an essential part of an embodiment of a printer according to the present invention, FIG. 2 is a view showing the internal structure of the entire printer, and FIG. 3 is a partially omitted plan view of the printer.

In FIG. 2, reference numeral 10 is a printer main body (hereinafter, also simply referred to as main body), and 20 is a paper feed cassette mounted on the bottom of the main body 10.

The case of the main body 10 comprises a lower case 11, an upper case 12, and a cover 13 detachably attached to the upper case 12.

A paper feed roller 14 is provided for the paper feed cassette 2.
Paper P stored in 0 (not shown in FIG. 2)
Are fed one by one.

The fed paper P is wound around the platen 15 via the paper feed path 10a and is also conveyed while being pinched between the paper feed roller 16 and the platen 15 to form a wire dot type print head. Printing is performed by 17 through an ink ribbon (not shown).

The printed paper passes through the paper discharge path 10b and the paper discharge roller pair 30, and is discharged from the paper discharge port 18 to the paper discharge tray 19
Is discharged to.

As shown in FIG. 2, the paper discharge port 18 is provided in a slit shape (see FIG. 3) extending in the paper width direction at the intersection of the upper surface 13a and the back surface 12a of the case.
The edge portion 18a located on the print head 17 side is linear.

The paper discharge tray 19 constitutes a paper guide, and guides the paper P1 in the process of being discharged so as to be brought into sliding contact with the edge portion 18a of the paper discharge port 18 located on the print head side.

According to such a printer, the paper P1 in the process of being discharged is discharged by the paper discharge tray 19 to the paper discharge port 18
4 is guided so as to come into sliding contact with the edge portion 18a located on the print head side, and therefore, the edge portion located on the print head side of the sheet and the paper discharge port, which occurs in the conventional printer as shown in FIG. The gap between and will be closed by the paper. In other words, the space S in which noise is emitted by the head 17 is closed by the upper case 12, the cover 13, and the sheet P1 in the process of discharging.

Therefore, the amount of noise generated by the head 17 leaking out of the case is significantly reduced.

Further, since the paper discharge tray 19 for supporting the discharged paper P1 constitutes the paper guide, the above-described operation can be obtained while the discharged paper P1 is supported by the paper discharge tray.

Further, the paper discharge port 18 is the upper surface 13 of the case.
Since it is provided at the intersection of a and the back surface 12a, the noise generated by the print head is sent toward the rear of the printer, and the noise on the front side of the printer where the user is generally located is further reduced. .

Although not directly related to the gist of the present invention,
In the above embodiment, noise prevention measures are also taken in the portion of the paper discharge roller pair 30, so that FIG.
Will be described with reference to.

The paper discharge roller pair 30 includes a drive roller 31 and
A driven roller 32 that contacts the drive roller 31 and rotates.
It consists of

The driving roller 31 is a roller made of a material having a large friction coefficient with respect to the paper P, for example, a rubber roller, and is arranged on the non-printing surface Pb side of the paper P.

As shown in FIG. 3, the drive roller 31 is provided with a gear 31b at one end of a shaft 31a. The gear 31b is brought into contact with the platen 15 and meshes with an intermediate gear 33 which rotates. It is driven to rotate. The shaft 31a and the gear 31b of the drive roller 31 are made of synthetic resin, and a rubber tubular body is fixed to the shaft 31a to form a drive roller.

Reference numeral 34 is a U-shaped holder in plan view, and the shaft 34a of the drive roller 31 and the shaft 33a of the intermediate gear 33 are rotatably supported by the holder 34. Holder 3
4 are holes 34b provided in the side plates 34a, 34a,
34b is a protrusion 12 provided on the upper case 12 of the main body 10.
It is rockably supported by fitting to b and 12b, and a compression spring 35 provided between the bottom plate 34c and the upper case thereof always urges the intermediate gear 33 in a direction in which the intermediate gear 33 contacts the platen 15. ing.

The intermediate gear 33 operates as a one-way clutch because the shaft 33a thereof is supported by the elongated hole 34d formed in the holder 34, and the platen 1
Power is transmitted to the drive roller 31 only when the motor 5 rotates in the direction of arrow a in FIG.

The driven roller 32 is a roller made of a material to which ink hardly adheres, for example, a synthetic resin roller, and is arranged on the printing surface Pa side of the paper P.

A shaft 32a of the driven roller 32 is rotatably supported by a holder 36 having a U-shape in plan view.
In the holder 36, the protrusions 36b and 36b provided on the side plates 36a and 36a of the holder 36 are slidably fitted in the long holes 38b of the support plate 38 attached to the cover 13 of the main body 10 by the engaging claws 38a and 38a. Accordingly, the driven roller 32 is configured to be movable back and forth with respect to the drive roller 31, and the compression spring 37 provided between the upper plate 36c and the cover 13 always causes the driven roller 32 to contact the drive roller 31. Being energized.

Reference numeral 40 denotes a guide piece integrally provided on the lower surface of the cover 13, and the guide surface 41 has a guide surface 41.
5 is formed at an angle so that the leading edge Pc of the sheet P initially sent in a slightly curved state is guided so as to come into contact with the drive roller 31 before the driven roller 32.

The portion 42 of the guide piece 40 located on the side of the drive roller 31 is located in the center direction (that is, in the direction of the shaft 31a) of the peripheral surface of the drive roller.

With the above structure, the following operational effects can be obtained.

The drive roller 31 is composed of a rubber roller,
Since the driven roller 32 is arranged on the non-printing surface Pb side of the paper P, and the driven roller 32 is composed of a synthetic resin roller and is arranged on the printing surface Pa side of the paper P, a good conveyance state of the paper P is obtained. At the same time, there is no inconvenience that the ink on the printing surface Pa of the paper is transferred to the printing surface Pa again via the driven roller 32.

Then, the leading edge Pc of the sheet is guided by the guide piece 40.
The guide surface 41 of the guide roller 41 guides the driven roller 32 to contact the drive roller 31 before the driven roller 32.
Since 1 is composed of a rubber roller, the leading edge Pc of the sheet is quickly guided by the pair of sheet discharging rollers 30 and is bitten therein.

Therefore, the conveying force for the printed paper P is quickly obtained, and the paper P is quickly wound in a state of being in close contact with the platen 15. Therefore, the head 17
Thus, a good printing state can be promptly obtained, and the vibration of the paper due to the collision of the wire protruding from the head 17 with the paper P is promptly reduced.

Further, since the portion 42 of the guide piece 40 located on the side of the drive roller 31 is located closer to the center than the peripheral surface of the drive roller 31, the paper P is pressed against the drive roller 31. As a result of being guided, it is possible to obtain a better paper conveyance state.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be appropriately made within the scope of the present invention.

[0047]

According to the present invention, it is possible to reduce the amount of noise leaking from the sheet discharge port and to reduce the noise.

[0048]

[Brief description of drawings]

FIG. 1 is a partially cut side view showing a main part of an embodiment of a printer according to the present invention.

FIG. 2 is a diagram showing an internal structure of the embodiment.

FIG. 3 is a partially omitted plan view of the above embodiment.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 P paper 10 printer 12a case back 13a case upper surface 15 platen 17 print head 18 paper ejection port 19 paper ejection tray

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Noguchi, 3-3-5 Yamato, Suwa City, Nagano Seiko Epson Co., Ltd. (72) Inventor, Yoshiaki Nakayama 3-3-5 Yamato, Suwa City, Nagano Prefecture Seiko Epson Incorporated (72) Inventor Kenjiro Murakami 3-5 Yamato, Suwa City, Nagano Seiko Epson Corporation

Claims (3)

[Claims] 1. A printer for ejecting a sheet printed by a print head provided in a case from a sheet discharge port provided in the case, wherein the sheet in the process of being discharged is the print head of the sheet discharge port. A printer comprising a paper guide that guides the edge portion located on the side so that the edge portion is slidably contacted. 2. The printer according to claim 1, wherein the paper guide includes a paper discharge tray that supports discharged paper. 3. The paper discharge port is provided at an intersection of an upper surface and a back surface of the case.
The listed printer.