JPS6372572A - Paper fixing apparatus of printer - Google Patents

Abstract

PURPOSE:To realize a paper mounting and detaching means in an extremely simple structure, by providing a stopper energized by a spring so as to bring a paper press plate to an open state at the time of the reversal of a drum and to move while pushed by a part of the paper press plate at the time of the positive rotation of the drum to return to the original position. CONSTITUTION:A stepped part 1a is formed to the outer periphery of a drum 1 and a paper press plate 2 is mounted to said stepped part 1a in an openable and closable manner and torsion springs 4 energizing the paper press plate 2 to a closed state are mounted to both side parts of said press plate 2. A stopper 6 is mounted to a frame 9 in a state movable only in a horizontal direction and a force is applied to the paper press plate 2 by a spring 7 in a direction interfering the arm part 2a of said press plate 2. When the drum 1 is reversed, the end surface 2a of the arm part 2a collides with the stopper 6 and the paper press plate 2 is separated from the stepped part 1a to become an open state and paper 5 can be mounted and detached. When the drum 1 rotates positively, the end surface 2ab of the arm part 2a collides with the stopper 6 and the arm part 2a pushes away the stopper 6 in the direction shown by an arrow and the paper press plate 2 becomes a closed state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper fixing device in a drum type printer suitable for application to thermal printers and the like.

[Conventional technology]

As a paper conveyance method mainly applied to color thermal printers, etc., the paper is fixed on the circumference of a drum and printing is performed once for each color by rotating the drum once, and the drum is rotated by the number of colors to be overlapped. , there is a method of overprinting one after another.

This drum type conventional printer has a driving means such as a solenoid for holding down the paper.

[Problem that the invention seeks to solve]

The conventional structure described above has problems in that the device is large because it includes a solenoid and the like, and a driving circuit is also required, making the structure complicated.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention includes a drum having a stepped part running in the axial direction on the outer periphery for pressing the edge of the paper, and a drum that is attached to the drum so as to be openable and closable in a manner opposite to the stepped part. a spring that urges the paper presser plate into a closed state and fixes the paper to the stepped portion of the drum; and a spring that is attached separately from the drum, and that when the drum is reversed, a part of the paper presser plate; When the drum collides with the drum, the paper holding plate is opened, and when the drum rotates forward, the paper holding plate is pushed and moved by a portion of the paper holding plate. The structure is as follows.

[For production]

According to the above means, the paper pressing plate can be opened and closed simply by rotating the drum in the forward and reverse directions, and the paper can be attached and removed. Further, since the paper attachment/detachment mechanism only includes a stopper and a spring that applies force to the stopper in a certain direction, the structure can be simplified and downsized.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings. A stepped portion 1a running in the axial direction is formed on the outer periphery of the drum 1 to press against the edge of the paper. Further, a paper pressing plate 2 is attached to the drum 1 so as to be openable and closable so as to face the stepped portion 1a.

That is, both ends of the paper pressing plate 2 are bent to form arm portions 2a, which are rotatably attached to both sides of the drum by horizontal pins 3. Further, screw springs 4 are provided on both sides of the drum 10 to bias the paper pressing plate 2 to the closed state.
is interposed.

Next, a stopper 6 is attached to the frame 9 separately from the drum so as to be movable only in the horizontal direction, and is applied by a spring 7 in a direction that interferes with the arm portion 2a of the paper holding plate.

In the above-mentioned state, when the drum 1 is reversed, the end surface 2aa of the arm 2a collides with the stopper 6 at the position shown in FIGS. It rotates clockwise against the bias of. Therefore, the paper pressing plate 2 is separated from the stepped portion 1a and becomes open, so that the paper 5 can be attached and detached.

On the other hand, when the drum 1 rotates normally as shown in FIGS. 2 and 5, the end surface 2ab of the arm 2a collides with the stopper 6, causing the arm 2
a pushes the stopper 6 in the direction of the arrow in the figure, and the paper pressing plate 2 maintains the closed state.

Then, when the arm portion 2a and the stopper 6 are separated, the third
As shown in the figure, the stopper 6 is returned to its original state by the spring 7.

Therefore, the relative positional relationship between the arm 2a supported by the bottle 3 on the drum 1 and the stopper 6 supported on the frame 9 is such that when the arm 2a and the stopper 6 are in a normal state, the drum 1 is When rotated in the reverse direction, the end surface 2aa of the arm portion 2a collides with the stopper 6, and when rotated forward, the end surface 2ab of the arm portion 2a is supported so as to collide with the stopper 6.

The rotation of the drum 1 is controlled by a control means (not shown).

〔Effect of the invention〕

As explained above, in this invention, a stopper biased by a spring is attached to the frame side, and the paper is attached and detached only by controlling the rotation of the drum, so that the means for attaching and detaching the paper is realized with an extremely simple structure. Ta.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the structure of the present invention, Fig. 2 is a perspective view showing the stopper moving, Fig. 3 is a perspective view showing the stopper in its normal position, and Fig. 4 is the perspective view showing the stopper in its normal position. 1 is a side view, and FIG. 5 is a side view of FIG. 2. 1... Drum, 2... Paper holding plate, 3... Bin, 4... Spring, 5... Paper, 6... Stopper,
7...Spring, 8...Head, 9...Frame.

Claims (1)

[Claims] Fix the printer paper on the outer circumference of the drum, and
In a printer that prints once by rotating the drum, the drum has a stepped part running in the axial direction on its outer periphery to press against the edge of the paper, and is attached to the drum so that it can be opened and closed in opposition to this stepped part. a spring that urges the paper presser plate into a closed state and fixes the paper to the stepped portion of the drum; and a spring that is attached separately from the drum, and that when the drum is reversed, a part of the paper presser plate; collides with the paper presser plate to open the paper presser plate, and when the drum rotates forward, it is pushed and moved by a part of the paper presser plate,
A paper fixing device for a printer, comprising a stopper that is biased by a spring so as to return to its original position after that.