JPH0211366A - Paper feed mechanism of printer - Google Patents

Abstract

PURPOSE:To perfectly use set roll paper to the last by providing the roll paper housing lid pivotally supported on a shaft parallel to a feed roller and brought into contact with a part of the peripheral surface of the roll paper and the spring member for energizing the housing lid to bring the roll paper into contact with a feed roller under pressure. CONSTITUTION:The bottom part of a hopper 1 charged with roll paper 7 is constituted so as to be curved in a circular arc shape and a feed roller 2 is arranged in a rotatable manner so as to inwardly protrude from said curved surface 1a and a paper feed-out port 6 is provided to the hopper 1 so as to be turned toward the tangential direction of the curved surface 1a of the bottom part of the hopper 1. Further, a shaft 5 is provided to the rear edge of the upper opening of the hopper 1 in parallel to the feed roller 2 and the roll paper housing lid 3 of the hopper 1 is pivotally supported by the shaft 5 in a revolvable manner and the free end 3a of the roll paper housing lid 3 is brought into contact with the peripheral surface of the roll paper 7 in the hopper 1 and, further, a torsion coil spring 4 for energizing the housing lid 3 to bring the roll paper 7 into contact with the feed roller 2 is mounted on the shaft 5.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paper feeding mechanism for a roll paper printer.

[Conventional technology]

As shown in FIG. 3, the paper feeding mechanism (hereinafter referred to as the paper feeding mechanism) of a conventional roll paper printer loads a roll paper 7, which is a strip of continuous paper wound into a roll, into a hopper 1.
A feed roller 2 is brought into pressure contact with the roll paper 7, and the feed roller 2 applies rotational feed to the roll paper 7, so that the continuous paper 7a is fed out from the roll paper 7 through the paper outlet 6 of the hopper 1.

Further, a roll paper storage lid 23 is provided at the upper opening of the hopper 1 so as to be openable and closable.

[Problem to be solved by the invention]

However, in the conventional paper feeding mechanism described above, the bottom shape of the hopper is used to press the roll paper against the feed roller due to its own weight, so the roll paper is used and has a small diameter, resulting in a shape that does not fit in with the bottom shape of the hopper. If this happens, it will no longer come into pressure contact with the feed roller, making it impossible to feed the roll paper.

That is, when the roll paper 7 is set in the hopper 1 and the feed roller 2 is rotated, if the diameter of the inserted roll paper 7 is large like when the roll paper is first used, the diameter of the roll paper 7 is as shown in FIG. 4(a). Since the roll paper 7 is in contact with the feed roller 2, the roll paper 7 can be sent out. However, when the roll paper 7 whose diameter has become smaller after being used for some time is to be used again, as shown in FIG. 4(b). This has the drawback that the roll paper 7 separates from the feed roller 2, making it impossible to feed the paper.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feed mechanism for a roll paper printer that eliminates the above-mentioned drawbacks.

[Means to solve the problem]

In order to achieve the above object, the present invention applies rotational feed to a roll paper formed by winding a band-shaped continuous paper into a roll shape, and provides a paper feeding mechanism for a roll paper printer that feeds the continuous paper from the roll paper, in a hopper. a feed roller that rotates the roll paper loaded in the roll paper by contact friction resistance; a roll paper storage lid that is pivotally supported on a shaft parallel to the feed roller and makes contact with a part of the circumferential surface of the roll paper; and the storage lid. and a spring member that biases the paper roll to press the roll paper against the feed roller.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2(a)
, (b) are cross-sectional views illustrating the operation.

In the figure, reference numeral 7 denotes a roll paper made by winding a band-shaped continuous paper into a roll. The bottom of the hopper 1 into which the roll paper 7 is loaded is curved in an arc shape, and the inner part of the hopper 1 is curved inward from the curved surface 1a. The feed roller 2 is rotatably installed so as to protrude toward the
In addition, a paper outlet 6 is provided in the tangential direction of the bottom curved surface 1a of the hopper 1.

Further, a shaft 5 is provided at the rear edge of the upper opening of the hopper 1 parallel to the feed roller 2, and the roll paper storage lid 3 of the hopper 1 is connected to the shaft 5.
The free end 3 of the roll paper storage lid 3 is rotatably supported.
a is brought into contact with the circumferential surface of the roll paper 7 in the hopper 1, and the shaft 5 is further equipped with a torsion coil spring 4 that biases the storage lid 3 and presses the roll paper 7 against the feed roller 2. Although the torsion coil spring 4 is used as the spring member, the present invention is not limited to this. Further, the storage lid 3 is provided with a notch 3b for operation, making it easy to open and close the lid 3.

In the embodiment, when a large-diameter roll paper 7 is loaded into the hopper 1, the circumferential surface of the roll paper 7 comes into pressure contact with the feed roller 2 as shown in FIG. 2(a). 1, the roll paper 7 is rotated in a counterclockwise direction, and continuous paper 7a is fed out from the roll paper 7 through the paper outlet 6 of the hopper 1.

On the other hand, when the roll paper 7 is used and its diameter becomes smaller,
Although it becomes difficult to maintain the pressure contact state between the roll paper 7 and the feed roller 2, according to the present invention, the storage lid 3 is biased by the torsion coil spring 4 to force the roll paper 7 into pressure contact with the feed roller 2. Even if the roll paper 7 becomes smaller in diameter after being used, the roll paper 7 always rotates under the rotational feed caused by the contact friction of the feed roller 2, and it becomes possible to feed the continuous paper 7a from the roll paper 7 to the end.

〔Effect of the invention〕

As described above, according to the present invention, the peripheral surface of the roll paper is always pressed against the feed roller regardless of the diameter of the roll paper, so that stable paper feed can be achieved by the rotation of the roller. The set roll paper can be used up to the end, which has the effect of saving costs.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2(a)
, (b) is a cross-sectional view explaining the present invention in detail, FIG. 3 is a perspective view showing a conventional example, and FIGS. 4(a) and (b) are cross-sectional views explaining the operation of the conventional example. 1...Hopper 2...Feed roller 3.
... Roll paper storage lid 4 ... Torsion coil spring (spring member) 5 ... Shaft
6...Paper feed lower...roll paper
7a... Continuous paper patent applicant: Nippon Electric Data Equipment Co., Ltd., l'b) Figure Figure Figure Figure Figure

Claims (1)

[Claims] (1) In the paper feed mechanism of a roll paper printer that feeds the continuous paper from the roll paper by giving rotational feed to the roll paper made by winding a band-shaped continuous paper into a roll shape, the roll paper loaded in the hopper is A feed roller that provides rotational feeding due to contact friction resistance, a roll paper storage lid that is pivoted on a shaft parallel to the feed roller and makes contact with a part of the circumferential surface of the roll paper, and a roll paper storage lid that urges the storage lid to feed the roll paper. 1. A paper feed mechanism for a printer for roll paper, characterized in that the paper feed mechanism has a spring member that presses a feed roller into contact with the feed roller.