JP2535658Y2 - Printer 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 feeder for a printer.

[0002]

2. Description of the Related Art Conventionally, a paper feeder of this type of printer has a motor for driving printing paper such as continuous paper and cut sheet paper, and receives a driving force of the motor to move the printing paper in a forward direction or a reverse direction. It is composed of a platen to be fed, and a pressing film made of a resin film for contacting the platen to prevent floating of the printing paper.

[0003] The pressing films include a flat pressing film and a bent pressing film having an obtuse bend formed at the tip.

[0004]

However, in the case of a flat pressing film, the continuous paper Pc may be reversely fed when performing color printing or enlarged character printing. At the perforated portion, the continuous form paper is returned with the continuous form paper bent, and the perforated part may come into contact with the end face (break surface) of the presser film and be returned in a state of being caught. Alternatively, a problem may occur that may cause damage to the holding film.

In the case of a pressing film having a bent shape in which an obtuse angle is formed at the front end, the above-mentioned disadvantages of the pressing film having a flat shape can be solved, but there are the following inconveniences. That is, in general, it is very difficult to bend a resin film, and in particular, the pressing film as described above needs to be brought into contact with a platen or the like at an acute angle. In such a configuration, it is necessary to bend at two places. Therefore, the bending process becomes more difficult. and again,
Since the bent portion extends further than the position where it comes into contact with the platen, the occupied area becomes large and other members such as the print head cannot be placed immediately after the bent portion.

[0006] The present invention has been made to solve the above problems transport, easy to machining of the push member, and at the occupied area is small configuration of the pressing member, the printing paper in the reverse direction It is an object of the present invention to provide a paper feeder for a printer in which a jam does not occur and a presser film is not damaged even if it is caused to do so.

[0007]

In order to achieve this object, a paper feeder of a printer according to the present invention is provided with a paper driving means for transporting print paper in both forward and reverse directions, and a paper transport for forming a transport path for the print paper. Near the member and the paper transport member
The printing paper is placed next to the paper
In the sheet feeder of the printer having a pressing member made of resin film that presses against the conveying member, the pressing
Before covering the tip of the member with the bent middle part
Covering member made of resin film thinner than the pressing member
And both end portions of the covering member excluding the intermediate portion and the
Is provided between the pressing member, the pressing portion of the object covering member
A bonding layer for bonding to a material .

[0008]

In the paper feeder of the printer according to the present invention having the above configuration, the resin film which is thinner than the pressing member is used.
The covering member consisting of the pressing member at the bent intermediate portion
Covers the leading edge so that the leading edge is in contact with printing paper
Becomes smoother. In addition, both ends except the middle part of the covering member
An adhesive layer provided between the portion and the pressing member,
Is bonded to the pressing member, so that the
The thickness does not increase, and the area occupied by the pressing member can be reduced .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 is a schematic diagram of a paper feeder of a printer according to an embodiment of the present invention. As shown in FIG. 2, a platen 2 can be rotated by a platen shaft 3 along a width direction of the printing paper on a transport path Cm of the printing paper such as a continuous paper Pc and a cut sheet Ps. A platen gear 4 is fixed to one end of the platen shaft 3. A paper guide plate 6 rotatably supporting a plurality of paper pressing rollers 5 is provided below the platen 2, and a print reciprocally movable along the platen 2 is provided on the front side of the platen 2. A head 7 is provided.

On the other hand, the printing paper Pc, P
A tractor unit 8 is provided on the upstream side in the transport direction of s. The tractor unit 8 includes a transmission shaft 9 and a guide shaft 10 which extend in parallel with the platen 2 and are rotatably supported by the printer case 1. On both the shafts 9, 10, the movement of the continuous paper Pc is adjusted in the width direction. A pair of possible left and right pin tractors 11 is supported.

In each pin tractor 11, a plurality of orbiting pins are provided between a drive pulley inserted through the transmission shaft 9 via the tractor frame 12 and a driven pulley supported by the tractor frame 12. Having a pin belt. Further, the tractor frame 12 has a paper holding plate 16 which can be switched between a lying position and a standing position.
Is provided.

As shown in FIG. 2, a tractor gear 17 is fixed to the end of the transmission shaft 9 outside one of the pin tractors 11. The tractor gear 17 is meshed with the platen gear 4 via a pair of intermediate gears 18 and 19 rotatably supported by the printer case 1. Further, one of the intermediate gears 18 has
A motor gear 21 of a paper feed motor 20 as a drive source rotatable in forward and reverse directions is meshed and connected. A well-known clutch mechanism (not shown) is provided in a transmission path from the intermediate gear 18 to the transmission shaft 9, and selectively transmits the rotation of the paper feed motor 20 to the pin tractor 11.

Above the tractor unit 8, a paper feed mechanism for holding and feeding the cut sheet Ps is provided.

In this embodiment, a pressing film 22 is adhered and fixed to the downstream side of the paper guide plate 6 and the opposite side to the platen 2 (the side not in contact with the conveyed printing paper Pc, Ps). ing.

FIG. 1 shows the structure of the pressing film 22.
The pressing film 22 is adhered to a portion of the downstream end surface of the paper guide plate 6 opposite to the platen 2, and the width in the horizontal direction is the maximum paper width printable by the printer. Slightly longer than For this reason, the printing paper Pc,
There is no possibility that Ps abuts and hinders sheet feeding. The pressing film 22 has a thickness of 125 micrometers and is made of polyester. However, when the pressing film 22 is applied to a printer mainly handling thick paper, it is necessary to make the pressing film 22 thicker than this thickness and to have high rigidity.

The end face of the pressing film 22 may be broken by a cutter or the like, and it is not particularly necessary to treat the end face.

The end face of the pressing film 22 extending in the width direction (perpendicular to the paper surface in FIG. 2) is positioned just below the printing position by the print head 7 when the printing papers Pc and Ps are not inserted. The platen 2 comes into contact with the platen 2 at an acute angle from the sheet conveyance direction. This contact pressure is applied to the printing paper P sent in contact with the platen 2.
c and Ps are such that they can be easily inserted between the platen 2 and the pressing film 22. Then, as shown in FIG. 1, the printing papers Pc and Ps are pressed toward the platen 2 while being elastically deformed according to the thickness of the printing papers Pc and Ps.

The end face of the pressing film 22 extending in the width direction is covered with a tape 22a shown in FIG. The tape 22a is made of a polyester film and has a thickness of 25 micrometers, and is attached to the pressing film 22 with a double-sided adhesive tape 22b. In addition, since the right end face of the double-sided adhesive tape 22b in FIG. 1 is adhered from the base of the pressing film 22, the end faces of the printing paper Pc and Ps are not caught when feeding the printing paper Pc, which hinders the paper feeding. Does not affect.

Further, as shown in FIG. 1, the end of the tape 22a is pressed by a double-sided adhesive tape 22b.
However, since the intermediate portion including the bent portion does not have the double-sided adhesive tape 22b, the pressing film 2 is stretched on both sides where the double-sided adhesive tape 22b is attached.
By sticking on No. 2, wrinkles do not occur in the middle part. As a result, the paper can be fed smoothly.

Next, the paper transport operation of the paper feeder of the printer having the above-described configuration will be described.

Here, the case where printing is performed on the continuous form paper Pc will be described, but the case where printing is performed on the cut sheet Ps is almost the same. The continuous paper Pc is formed with perforations Pcm at regular intervals.
m and supplied in a folded state.

First, in a state where the feed hole at the leading end of the continuous paper Pc is engaged with each pin 15a of the pin tractor 11 and set, a predetermined amount of forward direction (rightward in FIG. 2) is applied to the continuous paper Pc. The paper feed motor 20 is driven to rotate forward by a predetermined amount in order to give the feed. As a result, the rotational movement is transmitted to the pin tractor 11 and the platen 2 via the gears 4, 17 to 19, and 21, respectively. It is transferred (conveyed) from 11.

Then, the continuous form paper Pc is stored in the continuous form path Cc,
The paper is sent in the forward direction via a transport path Cm between the platen 2 and the paper guide plate 6.

The print head 7 is driven, and at the same time, the pin tractor 11 and the platen 2 are driven by the paper feed motor 20 to perform predetermined printing on the continuous paper Pc.

During printing, for example, when performing color printing or printing enlarged characters, the continuous paper Pc may be fed in the reverse direction. At that time, the continuous form paper Pc is returned in a state where the continuous form paper Pc is bent at the perforation Pcm portion of the continuous form paper Pc.

At this time, in this embodiment, the pressing film 22
Since the leading end of the end face has been subjected to the end face treatment with the tape 22a, the coefficient of friction in the sheet returning direction at the end face is low, and the end fracture surface has a smooth curved surface. When approaching the contact point of the pressing film 22, the pressing film 22 is elastically deformed and separated from the platen 2 side as shown in FIG. 1, and the perforation Pcm passes between the pressing film 22 and the platen 2.

The double-sided adhesive tape 22b for sticking the tape 22a to the pressing film 22 was extended as far as possible on the platen 2 side and as far as possible from the end face on the print head 7 side. This is because the curvature of the tape 22a at the end face of the pressing film 22 can be increased without impairing the elasticity of the pressing film 22 and without hindering the sheet feeding.

Further, the printer of the present invention is particularly effective when printing a printing paper having a step, for example, a label paper.

The present invention is not limited to the above embodiment, but can be variously modified. For example, in the above embodiment, a combination of a polyester base film and a polyester tape is adhered, but a combination of a metal thin plate such as a stainless steel plate or the like with a polyester or other tape may be used.

In the above-described embodiment, the pressing film is provided on the upstream side of the printing position. However, the pressing film may be provided on the downstream side of the printing position to replace the paper bail.

[0032]

[Effect of the invention] As is clear from the above description,
According to the paper feeding device of the printer of the present invention, the pressing member
The tip part is covered with the covering member and becomes smooth
Therefore , there is an advantage that paper feeding is not hindered by unevenness such as perforations of the printing paper. In addition, the covering member is
There is no adhesive layer on the tip of the pressing member
Therefore, the thickness of the tip portion of the pressing member does not increase. Therefore,
Since other members such as a print head can be arranged immediately after the holding position, it contributes to high reliability and miniaturization of the apparatus.

[Brief description of the drawings]

FIG. 1 is an enlarged side view of a pressing film according to the present embodiment, which is partially cut away.

FIG. 2 is a partially cutaway side view of the paper feeding device of the printer of the embodiment.

[Explanation of symbols]

 2 Platen (paper transport means) 6 Paper guide plate 20 Paper feed motor (paper drive means) 22 Pressing film (pressing means) 22a Tape (covering member) Cm Transport path Pc Continuous paper Ps Cut sheet paper

Claims (1)

(57) [Scope of request for utility model registration] 1. A paper driving means for transporting a printing paper in both forward and reverse directions, a paper transporting member for forming a transporting path for the printing paper, and a paper transporting member arranged near the paper transporting member, and a front end portion provided with
Resin that presses the printing paper toward the paper transport member
In a paper feeder of a printer having a pressing member made of a film, a front end portion of the pressing member is covered with a bent intermediate portion.
A cover made of a resin film thinner than the pressing member to be covered.
A cover member, and both ends of the cover member excluding the intermediate portion and the pressing member
Provided between the pressing member and the covering member.
A paper feed device for a printer, comprising: an adhesive layer for bonding .