JP2792244B2 - Recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention considers the fact that the widths of a feed roller for recording paper, a roller frame for supporting the roller, and a body frame for supporting the roller expand and contract due to a change in ambient temperature. The present invention relates to a recording apparatus that suppresses a change in the lower limit of the recording range of a recording sheet, that is, the position of a starting point, which is caused by the gap provided, and supports improvement in recording accuracy.

[0002]

2. Description of the Related Art Conventionally, a difference in linear expansion between a feeding roller for recording paper and a roller frame supporting the same and between a roller frame and a main body frame supporting the same due to a change in ambient temperature. In consideration of the above, a slight gap is provided so as not to cause any trouble.

[0003]

Heretofore, there has been a slight gap between a recording paper feed roller and a roller frame supporting the same, and between the roller frame and a main body frame supporting the roller. On the other hand, the provision of the recording paper causes a lower limit of the recording range of the recording paper, that is, a change in the position of the starting point, and eventually causes a reduction in recording accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems of the prior art, and to reduce the width of each of the recording paper feeding roller, a roller frame supporting the roller, and a main body frame supporting the roller. It is an object of the present invention to provide a recording apparatus that suppresses a lower limit of a recording range of a recording sheet, that is, a position change of a starting point, which is caused by a gap provided in consideration of expansion and contraction due to a change in an ambient temperature, and supports improvement in recording accuracy. .

[0005]

According to a first aspect of the present invention, there is provided a recording apparatus which is rotatable within a predetermined range around a first axis of a main body frame as a mechanism mounting base frame. An apparatus having a supported roller frame and a recording paper feeding roller rotatably supported around a second axis parallel to the first axis of the roller frame, wherein the roller is fixed to the body frame. A spring provided between the roller frame and the main body frame so as to press the frame toward the lower limit of the recording range of the recording paper; and a shaft end face of the feeding roller on the upper limit side of the recording range. A leaf spring attached to the roller frame side so as to press toward the lower limit of the recording range. According to a second aspect of the present invention, in the apparatus of the first aspect, the leaf spring and the shaft end surface of the feeding roller make point contact at the center of the shaft end surface.

[0006]

In the recording apparatus according to the first or second aspect,
By pressing a roller frame against the main body frame by a spring and a feeding roller against the roller frame by a leaf spring toward the lower limit side of the recording range of the recording paper, a gap in the first axial direction between the main body frame and the roller frame is obtained. Second between roller frame and feeding roller
It is possible to eliminate the gap in the axial direction, thereby suppressing the lower limit of the position of the recording paper. In particular, in the recording apparatus according to the second aspect, it is possible to reduce the contact friction between the leaf spring and the shaft end surface of the feeding roller.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the recording apparatus according to the present invention will be described below with reference to the drawings. FIG. 3 is a front view of the embodiment, and FIG. 4 is a side view thereof. 3 and 4, a main body frame 1 includes a mechanical component or a mechanical unit of the device,
For example, a base frame for mounting the recording head 9 and the like,
It is stored in a case (not shown) so that it can be pulled out. The recording paper loaded in the roller frame 2 is fed by a feed roller 3 at a predetermined feed speed, and is stored in the lower front part of the main body frame 1. In FIG. 4, the roller frame 2 is rotatably supported by the shaft 4 about 45 degrees forward (counterclockwise) with respect to the main body frame 1. By this rotation, loading or replenishment of the recording paper and maintenance or replacement of the recording head 9 are performed.

FIG. 1 is a detailed plan view of the shaft end of the feed roller 3. In FIG. 1, the left and right shaft ends of the feed roller 3 are supported by bearings 7 coaxially fixed to the roller frame 2, and in particular, the right shaft end surface is pushed leftward by a leaf spring 8, Feeding roller 3 and roller frame 2
(Accurately, the gap in the axial direction between the bearing and the end face of each bearing 7) is removed. A convex portion 8a is integrally formed at a position of the leaf spring 8 which comes into contact with the right shaft end surface of the feeding roller 3, and the convex portion 8a and the center of the right shaft end surface of the feeding roller 3 make point contact. It takes shape.

FIG. 2 is a detailed plan view of a support portion relating to the roller frame 2 of the main body frame 1. In FIG. 2, only the right support portion is shown, and a shaft 4 is provided so as to pass through the main body frame 1 and the roller frame 2. The shaft 4 is prevented from falling out of the main body frame 1 by a retaining ring 6. A left side surface (inner surface) of the main body frame 1;
A coil spring 5 is inserted between the right side surface of the roller frame 2. By the bias of the coil spring 5, the roller frame 2 is pushed leftward with respect to the main body frame 1, and the gap between the roller frame 2 and the main body frame 1 in the direction of the shaft 4 is removed.

Therefore, in FIG.
1, the roller frame 2 with respect to the body frame 1, and in FIG.
Is pressed against the lower limit side (left side in the figure) of the recording range of the recording paper, so that the gap between the body frame 1 and the roller frame 2 in the direction of the axis of the shaft 4 (the first axis in the invention) and the roller frames 2
The gap between the feed rollers 3 in the direction of the axis of the feed roller 3 (the second axis in the present invention) can be eliminated, and the lower limit of the recording paper, that is, the position change of the starting point can be suppressed. Note that the starting point position is slightly to the right of the position of the left feeding pin 3a in FIG. In FIG. 1, the protrusion 8 a of the leaf spring 8 is in point contact with the right shaft end surface of the feed roller 3, so that the friction of the feed roller 3 during the rotation for feeding can be reduced. On the other hand, in FIG. 2, the inner surface of the main body frame 1, the side surface of the roller frame 2, and each end surface of the coil spring 5 take the form of pressing contact with the surface, but the rotation of the roller frame 2 with respect to the main body frame 1. This is sufficient, since the frequency of the is low.

[0011]

In the recording apparatus according to the first or second aspect, the roller frame is pressed against the main body frame by a spring, and the feeding roller is pressed against the roller frame by a leaf spring toward the lower limit of the recording range of the recording paper. Thereby, the gap in the first axial direction between the main body frame and the roller frame and the gap in the second axial direction between the roller frame and the feed roller can be eliminated, and the lower limit of the position of the recording paper can be suppressed. . Therefore, even if the main body frame and the feed roller thermally expand and contract in the axial direction due to the fluctuation of the ambient temperature, the lower limit position of the recording range of the recording paper, that is, the starting position for recording does not change. A decrease in recording accuracy can be prevented.
In particular, in the recording apparatus according to the second aspect, the contact friction and wear between the leaf spring and the shaft end surface of the feeding roller can be reduced, so that the feeding operation can be performed smoothly and the durability of the feeding roller can be improved.

[Brief description of the drawings]

FIG. 1 is a detailed plan view of a shaft end of a feeding roller in an embodiment according to the present invention.

FIG. 2 is a detailed plan view of a bearing portion related to a roller frame of the main body frame.

FIG. 3 is a front view of a main body of the embodiment.

FIG. 4 is a side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body frame 2 Roller frame 3 Feeding roller 4 Shaft 5 Coil spring 6 Retaining ring 7 Bearing 8 Leaf spring 8a Convex part

Claims (2)

(57) [Claims] 1. A roller frame rotatably supported in a predetermined range around a first axis of a main body frame as a mechanism mounting base frame, and a second frame parallel to the first axis of the roller frame. A recording paper feeding roller rotatably supported around an axis, wherein the roller frame is pressed against the main body frame toward a lower limit side of a recording range of the recording paper, A spring provided between the roller frame and the main body frame; and a plate attached to the roller frame side so as to press the shaft end face of the feed roller at the upper end of the recording range toward the lower end of the recording range. A recording device comprising: a spring; 2. A recording apparatus according to claim 1, wherein said leaf spring and said shaft end surface of said feeding roller are in point contact with each other at the center of said shaft end surface.