JPH0885650A - Holding structure for rolled recording paper - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a recording paper holding structure capable of making an appropriate frictional load applied to the recording paper when the recording paper is conveyed regardless of the weight of the roll recording paper. [Structure] At least two rollers 81, which are arranged in a recording paper storage portion 53 of a casing 50 of a recording apparatus and on which a roll-shaped recording paper 61 is placed, and support the rollers rotatably and vertically. Bearing 82 mounted on the housing in a freely slidable state, and a spring 83 for biasing the bearing upward.
And a friction member 84 that is positioned above a portion of the roller other than the portion on which the recording paper is placed and that is compressed by the roller that moves upward by the biasing force of the spring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll-shaped recording paper holding structure used for recording an image in a facsimile machine or the like.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show a recording section of a conventional thermal transfer type facsimile apparatus. The casing 10 of the recording portion of this apparatus is composed of a casing body 11 and a cover 12 that covers an upper opening of the casing body 11, and a roll-shaped recording paper 22 is stored in the casing body 11. A recording paper case 13 is provided for this purpose. In addition, a thermal head 23, a platen roller 24, and a cutter 25, which are mechanisms for printing on the recording paper 22, are provided in the housing body 11. The recording paper 22 includes a recording paper guide 29 and a guide roller 30. After that, it is passed between the thermal head 23 and the platen roller 24. A supply reel 27 for supplying the ink film 26 coated with the heat-melting ink and a take-up reel 28 for winding the ink film 26 after printing are provided above the thermal head 23. The ink film 26 is a film. Thermal head 2 through guides 31 and 32
3 and the recording paper 22. And
When the platen roller 24 is rotated by a drive source (not shown), the recording paper 22 is conveyed in the arrow direction,
Information is sequentially printed on the recording paper 22 by the thermal head 23.

In the above recording apparatus, if the frictional force between the recording paper case 13 and the roll-shaped recording paper 22 is large, it becomes difficult for the platen roller 24 to convey the recording paper 22. Therefore, by attaching a plastic film (not shown) having a small friction coefficient to the recording paper case 13, the friction load can be reduced, and because of the large weight of the recording paper, the plastic film can sufficiently reduce the frictional force. 8 is not possible, the shaft 33 and the bearing 34 are provided on the recording paper case 13 and the recording paper 22 is rotatably supported by the shaft 33 to reduce the frictional force. I was trying.

However, the above-mentioned configuration in which the frictional force between the recording paper 22 and the recording paper case 13 is simply reduced has the following problems.

It is desirable that the frictional force that hinders the rotation of the recording paper 22 be small enough to allow the recording paper 22 to be smoothly conveyed by the platen roller 24. On the other hand, however, some frictional force is not applied when the recording paper is conveyed. Then, due to the inertia of the recording paper 22, the recording paper 22 rotates more than the amount of the recording paper conveyed by the platen roller 24, and unraveling occurs.
2 may be broken, scratched or wrinkled. Therefore, the frictional force applied to the recording paper does not hinder the conveyance of the recording paper by the platen roller 24, and has a magnitude (hereinafter referred to as an appropriate frictional force) that can prevent the rotation of the recording paper due to inertia. Is desirable.

However, since the weight of the roll-shaped recording paper decreases in accordance with the amount used, for example, when the roll-shaped recording paper is set to have an appropriate frictional force when the weight of the roll-shaped recording paper is the largest, When the weight of the recording paper is reduced by use, the frictional force that prevents the rotation of the recording paper due to inertia becomes too small, and there is a problem that the recording paper is unwound.

In this case, it is conceivable to reduce the frictional force between the recording paper and the recording paper case as much as possible and to provide a brake mechanism for applying a constant frictional load to the recording paper, but the structure becomes complicated. is there.

[0008]

As described above, when the conventional roll-shaped recording paper holding structure is set so that an appropriate frictional force is exerted on a recording paper having a large weight, the frictional force is exerted on a recording paper having a small weight. There is a problem in that it becomes too small, and unwinding occurs due to the rotation of the recording paper due to inertia.

The present invention has been made to solve the above-mentioned conventional drawbacks. A roll-shaped recording paper having a simple structure can be applied with an appropriate frictional force regardless of the weight of the recording paper. It is intended to provide a retaining structure.

[0010]

SUMMARY OF THE INVENTION A roll-shaped recording paper holding structure of the present invention has at least two rollers arranged in a recording-paper accommodating portion of a casing of a recording apparatus and on which the roll-shaped recording paper is placed. And a bearing mounted on the housing in a state of supporting the roller rotatably and being vertically slidable,
A spring that urges the bearing upward and abuts on the roller that is positioned above a portion of the roller other than the portion on which the recording paper is placed and that moves upward due to the urging force of the spring. And a friction member.

[0011]

In the present invention, when a heavy recording paper is placed on the roller, the bearing moves downward against the elastic force of the spring, so that the contact pressure of the roller against the friction member decreases. Therefore, the rollers rotate smoothly, and the frictional load when rotating the recording paper is reduced.

On the other hand, when the recording paper of small weight is placed on the roller, the bearing moves upward due to the elastic force of the spring and the contact pressure of the roller against the friction member increases.
The roller becomes difficult to rotate, and therefore the recording paper on the roller also becomes difficult to rotate. However, in this case, since the weight of the recording paper itself is small, the recording paper can rotate while sliding on the rollers. Therefore, the frictional load when the recording paper is rotated is an appropriate load as in the case where a heavy recording paper is placed on the rollers.

[0013]

Embodiments of the present invention will now be described in detail with reference to FIGS. Here, FIG. 1 is a sectional view of a recording device in which a heavy recording paper is stored, and FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is a sectional view of a recording apparatus in which a recording paper having a small weight is stored, FIG. 4 is an enlarged view of a main part of FIG. 3, and FIG. 5 is an enlarged view of a bearing.

The recording apparatus of the present example constitutes the recording section of a thermal transfer type facsimile apparatus, and a casing 50 of the recording section.
As shown in FIGS. 1 and 3, the main body 51 and a cover 52 that covers an upper opening portion of the main body 51 are provided. Inside the main body 51, the roll-shaped recording paper 61 is provided. A recording paper case 53, which is a recording paper storage unit for storing
Is provided. The case 53 is formed of plastic integrally with the housing body 51. The housing body 5
1, a leg portion 55 is provided.

Further, as in the conventional facsimile apparatus, a heat sensitive head 63, a platen roller 64, and a cutter 65, which are mechanisms for printing on the recording paper 61, are provided in the housing main body 51, and the recording paper 53 records. The heat sensitive head 63 and the platen roller 64 are passed through a paper guide 66 and a guide roller 67. Further, a supply reel 71 for supplying the ink film 70 and a take-up reel 72 for winding the ink film 70 after printing are provided above the thermal head 63, and the ink film 70 passes through the film guides 74, 75 and the thermal head. It is positioned between 63 and the recording paper 61. Then, the platen roller 64 is rotated by a drive motor (not shown), so that the recording paper 61 is conveyed in the direction of the arrow and the thermal head 63.
Thus, the information is sequentially printed on the recording paper 61.

In the recording apparatus, the recording paper 61 is held by the following holding structure so that the friction load when the platen roller 64 conveys the recording paper 61 has an appropriate value.

The recording paper holding structure of this example comprises rollers 81, bearings 82, springs 83, and friction members 84. The roller 81 is composed of a main body portion 81a having a large diameter for mounting the recording paper 61, and a shaft portion 81b having a small diameter provided concentrically with the main body portion 81a at both ends of the main body portion 81a, The shaft portion 81b is rotatably held by the bearing 82.

The bearing 82 rotates a slide portion 82a attached to the bottom wall 51a of the housing main body 51 and a shaft portion 81b of a roller 81 provided at the upper end of the slide portion 82a so as to be vertically slidable by a predetermined amount. And a bearing main body 82b that holds the movable body 82b. The spring 83 is wound around the slide portion 82a of the bearing 82 and presses the bearing main body 82b so that the bearing 82 moves upward.

The friction member 84 is formed of, for example, sponge, rubber or the like, and is attached to the outer wall surface of the recording paper case 53 on the bottom side. This friction member 84 is
It is arranged above the first shaft portion 81b and is compressed by the shaft portion 81b of the roller 81 which is moved upward by the action of the spring 83. Further, a hole is formed in the bottom of the recording paper case 53, and the upper side of the main body 81a of the roller 81 is inserted into this hole and protruded inside the case 53. Further, two rollers 81 are arranged in parallel, and the recording paper 61 housed in the recording paper case 53 is placed on the main body 81a of the two rollers 81.

Since the configuration is as described above, FIG.
As shown in FIG. 2, when the heavy recording paper 61 is placed on the rollers 81, the weight of the recording paper 61 causes the bearing 82 to move downward against the elastic force of the spring 83. Therefore, the contact pressure of the shaft portion 81b of the roller 81 with respect to the friction member 84 decreases, and the roller easily rotates smoothly. Therefore,
The torque required to drive the heavy weight recording paper 61 by the platen roller 64 is reduced because the roller 81 is easily rotated. However, in the case of the recording paper 61 having a large weight, the inertial load on the recording paper itself is large, and therefore the unraveling of the recording paper conveyed during printing does not occur because the inertial load on the recording paper itself serves as a brake.

On the other hand, when the weight of the recording paper 61 placed on the roller 81 is reduced when the recording paper is used, the bearing 82 moves upward due to the elastic force of the spring 83, as shown in FIGS. The shaft 81b of the roller 81 is strongly pressed against the friction member 84, so that the roller 81 becomes difficult to rotate. Therefore,
The rotation of the recording paper 61 due to the recording paper conveyance during printing is
The rotation due to the sliding of the recording paper 61 with respect to the roller 81 is the main rather than the rotation due to the rotation of 1. Therefore, the frictional force when the recording paper 61 rotates becomes larger than that when the roller 81 rotates, but the torque required to convey the recording paper 61 does not become large because the weight of the recording paper 61 is small. Further, the weight of the recording paper 61 is small,
Therefore, although the inertial load of the recording paper itself is small, the recording paper 61 rotates while sliding with respect to the roller 81,
The frictional load between 61 becomes large, and this load acts as a brake to prevent the recording paper from being unwound.

FIG. 6 shows another embodiment of the bearing. The bearing 82A of this example is a slide portion 82a that is attached to the housing body 51 so as to be slidable in the vertical direction.
A bearing main body 82b provided at the upper end of the slide portion 82a for rotatably holding the shaft portion 81b of the roller 81, and a spring portion 82c for urging the slide portion 82a and the bearing main body 82b upward. It is integrally molded by. With such a structure, the number of parts and the number of mounting steps can be reduced.

In this example, the recording paper case 53 that surrounds the recording paper 61 is used as the recording paper storage unit. However, since the recording paper 61 itself is held by the rollers 81, the recording paper storage unit is used. What has a role of a guide when the recording paper 61 is placed on the roller 81 may be used. Further, the friction member 84 does not need to be fixed to the case 53 either, and the housing main body 51
It need only be fixed against. Further, the roller 81 is composed of a large-diameter main body 81a and a small-diameter shaft 81b, but the main body 81a and the shaft 81b may have the same thickness.

[0024]

As described above, in the roll-shaped recording paper holding structure of the present invention, when the weight of the recording paper is large, the roller on which the recording paper is placed easily rotates, and the weight of the recording paper is reduced. When the recording paper is small, it becomes difficult for the rollers to rotate. Therefore, the friction load when the recording paper is rotated on the rollers is appropriate regardless of the weight of the recording paper. Therefore, regardless of the weight of the recording paper, it is possible to reduce the driving torque required for conveying the recording paper and prevent the recording paper from unraveling.

[Brief description of drawings]

FIG. 1 is a sectional view of a recording apparatus according to an exemplary embodiment of the present invention, in which a heavy recording paper is stored.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a cross-sectional view of a recording apparatus according to an embodiment of the present invention, in which a recording paper having a small weight is stored.

FIG. 4 is an enlarged view of a main part of FIG.

FIG. 5 is a front view of the bearing according to the embodiment of the invention.

FIG. 6 is a front view of another bearing according to the embodiment of the invention.

FIG. 7 is a sectional view of a conventional recording apparatus.

FIG. 8 is a cross-sectional view of a conventional recording paper storage unit.

[Explanation of symbols]

 50 Housing 53 Recording Paper Storage 61 Recording Paper 81 Roller 82 Bearing 83 Spring

Claims (1)

[Claims] 1. At least two rollers arranged in a recording paper housing of a casing of a recording apparatus and on which roll-shaped recording paper is placed, and supporting the rollers rotatably and sliding in the vertical direction. A bearing attached to the housing in a free state,
A spring that urges the bearing upward and abuts on the roller that is positioned above a portion of the roller other than the portion on which the recording paper is placed and that moves upward due to the urging force of the spring. A roll-shaped recording paper holding structure, comprising: a friction member.