JPH0732061Y2 - Paper holding mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a paper pressing mechanism suitable for use in a printer or the like.

[Prior Art] A paper pressing mechanism used in a feeder portion of a conventional printer is normally constructed as shown in FIG. 5 because an opening mechanism for setting a paper is required. That is, 1 is a base of a feeder section on which the paper 2 is arranged, 3 is a paper pressing mechanism for the paper 2, and the paper pressing mechanism 3 is a paper pressing member 5 rotatably supported by a shaft 4 in an arrow direction. , And a tension coil spring 6 for urging the paper pressing member 5 in the closing direction (paper pressing direction). One end of the tension coil spring 6 is locked by a locking portion 7 provided below the shaft 4, and the other end is one side surface of the paper pressing member 5 from the rotation center of the paper pressing member 5 toward the rotation end direction. It is locked by a locking portion 8 provided at a distant position.

In this case, when the paper pressing member 5 is rotated clockwise to the open position shown by the chain double-dashed line, the locking portion 8 moves to the right of the line connecting the shaft 4 and the locking portion 7, Stable hold in open position.

9A and 9B are stoppers for locking the paper pressing member 5 at the paper pressing position and the open position, respectively.

[Problems to be Solved by the Invention] However, in such a conventional paper pressing mechanism 3, the locking portions 7, 8 of the tension coil spring 6 are further provided at a position apart from the rotation center of the paper pressing member 5. Must be provided with stoppers 9A and 9B, which is exposed on the side surface of the paper pressing mechanism 3 and has a bad appearance, or when the base 1 itself is a foldable type and is also used as a printer cover. There is an inconvenience that the mechanical portion of the mechanism 3 is exposed to the outside.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and the purpose thereof is that the appearance is good and the spring engaging portion is not required, and the assembling work is easy. It is to provide a paper pressing mechanism.

[Means for Solving the Problems] In order to achieve the above object, the present invention forms bearing holes for axially supporting the ends of shafts on both protrusions of a substantially U-shaped fixing member. Two engaging recesses are formed on the inner wall of one of the protrusions and are spaced apart from each other by a required angle around the bearing hole, and the two engaging recesses are provided on one side surface of a paper pressing member rotatably supported by the shaft. And a biasing member for biasing the paper pressing member in the direction of the one protrusion between the other side surface and the inner wall of the other protrusion of the fixing member. It was done.

[Operation] In the present invention, the paper pressing member is held at the paper pressing position and the open position by the engaging protrusion selectively engaging with the two engaging recesses of the fixing member. The biasing member is interposed between the inner wall of the other protruding portion of the fixing member and the other side surface of the paper pressing member, is not visually recognized from the outside, and presses the paper pressing member in the direction in which the engaging projection and the engaging recess are engaged. The member is pressed and urged.

[Embodiment] Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

1 is a partially cutaway front view showing an embodiment of a paper pressing mechanism according to the present invention, FIG. 2 is an exploded perspective view of the same, FIG. 3 is a plan view of a paper pressing state, and FIG. 4 is the same. FIG. 3 is an external perspective view of a printer including a mechanism. In these drawings, a paper pressing mechanism 12 that presses the paper 2 and restricts the movement in the width direction is provided on both sides of the front surface of the base 1 which is provided on the feeder portion 11 of the printer 10 and is inclined backward by a required angle. ing. Since the base 1 is provided so as to be foldable, it also serves as a cover for the feeder unit 11.

The paper pressing mechanism 12 includes a fixing member 14 that is screwed and fixed on the base 1, a paper pressing member 15 that is rotatable (openable and closable) with respect to the fixing member 14 via a shaft 16, and a paper pressing member. The compression coil spring 17 serves as a biasing member that biases the member 15 in one direction parallel to the shaft 16.

The fixing member 14 is formed in a substantially U-shape so that the base portion 14A and the pair of projecting portions 14 opposite to both end portions of the base portion 14A.
B and 14C, bearing holes 18A and 18B for fixing the ends of the shaft 16 by press-fitting or the like are formed through both protrusions 14B and 14C, and the inner wall surface of one protrusion 14B is formed. , The bearing holes parallel to and perpendicular to the surface of the fixing member 14
Engagement recesses 19A and 19B are formed by two V-shaped (or U-shaped) grooves intersecting at the center of 18A. The one engaging recess 19A locks the paper pressing member 15 at the paper pressing position, and the end opposite to the bearing hole 18A is open to the tip surface of the one protruding portion 14B. Both ends of the other engaging concave portion 19B are open to the upper and lower surfaces of the protruding portion 14B, and the paper pressing member 15 is locked at the open position.

The paper pressing member 15 has a base portion 15A that is inserted into the recess 20 of the fixing member 14, and is connected to one end of the base portion 15A and has a length substantially equal to that of the fixing member 14 and a plate thickness smaller than that of the base portion 15A. The base 15A is rotatably and axially movably supported by the shaft 16 so as to press the side edge of the paper 2. Further, the base portion 15A is formed with a shaft hole 21 which is opened on both side surfaces thereof and through which the shaft 16 is inserted, and one side surface facing the inner wall surface of the one protruding portion 14B of the fixing member 14 is formed. The two engaging recesses 19
Engagement protrusion 23 composed of a triangular prism that selectively engages A and 19B
Of the fixing member 14 and the other protrusion 14 of the fixing member 14.
A spring accommodation hole 24 for accommodating the compression coil spring 17 is formed coaxially with the shaft hole 21 on the other side surface facing the inner wall surface of C.

The compression coil spring 17 is accommodated in the spring accommodating hole 24 in a compressed state, and one end of the compression coil spring 17 is pressed against the inner wall surface of the protrusion 14C, so that the paper pressing member 15 is fixed to one protrusion 14B of the fixing member 14. Biased in the direction.

In the paper pressing mechanism 12 having such a structure, at the time of pressing the paper, the engaging projection 23 engages with the one engaging recess 19A to fix the paper pressing member 15 to the fixing member 14, in other words, the paper 2. They are held almost parallel. At this time, a sufficient gap is set between the base 1 and the paper pressing member 15 to stably guide the paper 2. When the paper pressing member 15 is rotated in the clockwise direction in FIG. 2 in this state, the engaging projection 23 is moved to the engaging recess 19A.
In order to get out of the paper holding member 15, the paper pressing member 15 moves to the right against the compression coil spring 17, rotates a predetermined angle (90 °), and when the engaging projection 23 coincides with the other engaging recess 19B, The spring force of the compression coil spring 17 moves to the left, and the engagement protrusion 23 engages with the engagement recess 19B to be held in the open position.

Thus, according to the paper pressing mechanism 12 having such a configuration, since the spring for urging the paper pressing member 15 is composed of the compression coil spring 17 and is incorporated in the paper pressing member 15, the conventional tension coil spring system is used. Compared with the above, a spring engaging portion and a stopper are not required, and therefore, the work of hooking the spring on the engaging portion at the time of assembly is unnecessary, and workability can be improved. Further, the compression coil spring 17 is almost invisible from the outside, and the appearance of the paper pressing mechanism 12 is also good.

In the above embodiment, the paper pressing mechanism 12 is provided on the base 1 which also serves as the cover of the feeder unit 11. However, the present invention is not limited to this, and the paper pressing mechanism of the tractor feeder paper feeding mechanism is used. It is also applicable to the department.

Further, in the above embodiment, the engaging concave portions 19A and 19B are formed by two V-shaped grooves which are orthogonal to each other, but the present invention is not limited to this, and a predetermined angle (eg: 90
°) It may be a hemispherical recess provided on the same circumference with a space therebetween.

[Advantages of the Invention] As described above, in the paper pressing mechanism according to the present invention, the paper pressing member is urged between the inner wall of the protruding portion of the fixing member and the side surface of the paper pressing member facing the inner wall of the protruding portion. Since the urging member is interposed, the work of attaching the urging member is simple and easy, it is not exposed to the side of the paper pressing mechanism, and it can be compactly assembled, and the appearance of the paper pressing mechanism is also visible. It is good.

[Brief description of drawings]

1 is a partially cutaway front view showing an embodiment of a paper pressing mechanism according to the present invention, FIG. 2 is an exploded perspective view of the same, FIG. 3 is a plan view of a paper pressing state, and FIG. 4 is the same. FIG. 5 is an external perspective view of a printer having a mechanism, and FIG. 5 is a side view of a conventional paper pressing mechanism. 1 ... Base, 2 ... Paper, 5 ... Paper pressing member, 6 ...
Tension coil spring, 12 …… Paper pressing mechanism, 14 …… Fixing member, 14A, 14B …… Projection part, 15 …… Paper pressing member, 16 ……
Shaft, 17 ... compression coil spring, 18A, 18B ... bearing hole, 19
A, 19B ... Engagement recess, 21 ... Shaft hole, 23 ... Engagement projection, 24
...... Spring storage hole.

Claims (1)

[Scope of utility model registration request] 1. A bearing hole for axially supporting an end portion of a shaft is formed in both projecting portions of a substantially U-shaped fixing member, and a required angle is formed around the bearing hole in an inner wall of one projecting portion. Two engaging recesses that are separated from each other are provided, and an engaging protrusion that selectively engages with the two engaging recesses is provided on one side surface of a paper pressing member that is rotatably supported by the shaft. A paper pressing mechanism characterized in that a biasing member for biasing the paper pressing member toward the one protruding portion is interposed between the other side surface and the inner wall of the other protruding portion of the fixing member.