JPH0755746B2 - Roll paper loading device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll paper loading device for loading a roll-shaped recording paper (hereinafter abbreviated as “roll paper”) and supplying the recording paper in a facsimile, a copying machine or the like. Regarding

2. Description of the Related Art Conventionally, roll paper is often used to supply recording paper to a recording unit in a facsimile or a copying machine. Fourth
The figure shows a schematic structure of a recording apparatus using a conventional roll paper loading device. 1 is a roll paper, 2 is a storage box for storing the roll paper 1, 3 is a recording paper fed from the roll paper 1. A recording head 4 for storing the written image is a recording roller for pressing the recording paper against the recording head 3 and carrying the recording paper, and a reference numeral 5 is a recording motor for rotationally driving the recording roller 4. When the device is operated by the user, the recording motor 5
Is transmitted to the recording roller 4, the recording roller 4 rotates in the direction of arrow A at a predetermined speed, and the recording paper is fed from the roll paper 1 in the direction of arrow B, and the recording head 3 sequentially records on the recording paper. To do. Here, the roll paper 1 is merely dropped into the storage box 2, and during repeated recording paper, the roll paper 1 rotates while frictionally contacting the front wall 2a and the bottom wall 2b of the storage box 2.

Further, as another roll paper mounting mechanism, a roll paper center is rotatably held (see, for example, JP-A-61-2067).
No. 62), the lower surface of the roll paper is held by two parallel auxiliary rollers, and the auxiliary rollers are driven at the same speed as the recording roller (for example, Japanese Utility Model Laid-Open No. 61-1575).
No. 57) is known.

Problems to be Solved by the Invention However, all such conventional configurations have problems. That is, as shown in FIG. 4, when the roll paper is simply dropped into the storage box, the roll paper rotates while making frictional contact with the front wall and the bottom wall of the storage box. In this case, a large frictional force is generated, a large drive torque is required for the recording motor for conveying the recording paper, and there is a problem that the recording motor cannot be downsized and the cost thereof cannot be reduced.

Also, in the case of holding the center of the roll paper rotatably,
There is a problem that a complicated mechanism for that is required, not only the cost is increased, but also the mounting of the roll paper is troublesome.

Further, in the case where the roll paper is held by the rotation driven auxiliary roller, there is a problem that the auxiliary roller and its driving device are required, the structure becomes complicated and the cost becomes high.

The present invention has been made in view of the above problems, and provides a roll paper loading device that can realize the downsizing and cost reduction of a recording motor with a simple structure and that can easily load roll paper. The purpose is to provide.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a rotary unit, which is rotatable in parallel to the axis of a roll paper to be stored, at the bottom of a storage box having a front wall that contacts the roll paper. A support roller is provided, and the support roller is configured to support a fully-rolled roll paper mounted so as to come into contact with the front wall of the storage box on the rear side of the center of the roll paper.

The present invention has the above-described structure, and when the roll paper stored in the storage box has a large diameter and a large weight, the roll paper is supported by the rotatable support roller. It is halved, the required drive torque is reduced, and it is possible to use an inexpensive and small recording motor. When the diameter of the roll paper decreases as the recording paper is consumed, the roll paper is no longer supported by the support rollers and is supported by the bottom wall of the storage box, and frictional force with the bottom wall acts. At this time, since the weight of the roll paper is small, the frictional force is not so large, and the recording paper can be fed out without any trouble by the small recording motor.

Embodiments Embodiments of the present invention shown in the drawings will be described below.

FIG. 1 is a schematic inner side view schematically showing a recording apparatus equipped with a roll paper mounting apparatus according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-II. In FIG. 1 and FIG.
10 is a roll paper, 11 is a roll paper loading device for storing this roll paper, 12 is a recording paper fed from the roll paper 10, 13 is a recording head for recording on the recording paper, 14 is the recording paper pressed against the recording head A recording roller that conveys the recording roller 14 together, and a recording motor 15 that rotates the recording roller 14. The roll paper loading device 11 has a storage box 17 having a front wall 17a and a bottom wall 17b, a support roller 18 provided at the bottom of the storage box 17, and a rotary shaft 19 fixedly holding the support roller 18. . The rotating shaft 19 is rotatably attached to the side wall of the storage box 17, and thus the support roller 18 is rotatable. The support roller 18 may be rotatably held by the rotating shaft 19 and the rotating shaft may be fixed.
The upper end of the support roller 18 projects from the bottom wall 17b of the storage box 17 and can support the roll paper 10. The support roller 18 supports the fully-rolled roll paper 10 mounted in the storage box 17 so as to come into contact with the front wall 17a on the rear side of the center XX of the roll paper. It is arranged parallel to the axis of the roll paper 10.

The operation of the recording apparatus having the above configuration will be described below. The standby state is as shown in FIG. Next, during recording, the recording head 13 follows the recording paper 12 according to the input recording signal.
Further, for example, one-dimensional printing is performed in the width direction of the recording paper 12.
Then, the recording motor 15 is energized to rotate the recording roller 14 in the arrow A direction by a predetermined amount. As a result, the recording paper 12 delivered from the roll paper 10 is conveyed by a predetermined amount in the direction of arrow B. Thereafter, printing by the recording head 13 and conveyance of the recording paper 12 by the recording roller 14 are alternately performed, whereby a two-dimensional written image is recorded on the recording paper 12.

By the way, when feeding the recording paper from the roll paper 10,
When the remaining amount of the roll paper 10 is large, as shown in FIG. 1, the roll paper 10 contacts the front wall 17a and the bottom support roller 18a.
Supported by. Therefore, when the roll paper 10 is pulled by the recording paper 12 and rotates, the roll paper 10 makes frictional contact with the front wall 17b, but the support roll 18 supporting the roll paper 10 rotates in the direction indicated by the arrow c. , Does not give much resistance to the rotation of the roll paper 10. With this, the roll paper 1 directly on the bottom wall 17b
As compared with the case where 0 is supported, the rotational resistance of the roll paper 10 is reduced, and the drive torque required for feeding the recording paper 12 can be reduced.

When the diameter of the roll paper 10 decreases as the recording paper is consumed, the roll paper 10 is no longer supported by the support roller 18, and is supported by the bottom wall 17b of the storage box 17 as shown by the chain double-dashed line in FIG. Becomes Therefore, the roll paper 10 has a frictional force acting not only on the front wall 17a but also on the bottom wall 17b, but at this time, since the weight of the roll paper 10 is small, the frictional force is not so great. not big.

FIG. 3 shows the recording paper remaining amount of the roll paper 10 and the roll paper 10
6 is a graph showing the relationship with the torque required to rotate and rotate the recording paper. In the figure, the curved line (a) indicates the support roller 18
Shows the case where no support roller 18 is provided, and the curve (b) shows the case where the support roller 18 is provided. In the figure, D shows the remaining amount of the roll paper 10 when the remaining amount of the roll paper 10 becomes small and the contact between the support roller 18 and the roll paper 10 disappears, and f shows the recording paper.
The torque against the back tension required to stabilize the transport of 12 is shown. As is clear from the figure, in the case of the present embodiment, the torque required to feed the recording paper 12 from the roll paper 10 is maximum a at the beginning of use of the roll paper 10, and the curve ( When the roll paper 10 does not come into contact with the support roller 18 as shown in (b),
It slightly increases (up to e) as in (c), but then decreases as in curve (a). Therefore, the maximum torque a is
It is half the maximum torque b in the conventional case where the support roller 18 is not provided, the output torque required for the recording motor 15 is small, and an inexpensive and small motor can be used. Further, even when the remaining amount of the roll paper 10 becomes small and the required torque becomes small, the front wall 17a and the bottom wall 17b are
Since it is in frictional contact with, a torque larger than the required back tension f is required. Therefore, an appropriate back tension is always generated, and the recording roller 14 can feed the recording paper 12 without causing it to meander.

In the above embodiment, when the contact between the roll paper 10 and the support roller 18 is lost (that is, when the remaining amount of the roll paper 10 is D), the required torque e is when the roll paper 10 is not used. However, the present invention is not limited to this relationship, and the required torque e may be larger than the required torque a.

EFFECTS OF THE INVENTION As is apparent from the above description, the present invention provides a support roller rotatable in parallel to the axis of the roll paper to be stored in the bottom of the storage box having the front wall that comes into contact with the roll paper. The support roller is configured so that the roll paper that is loaded so as to come into contact with the front wall of this storage box is supported behind the center of the roll paper. In order to hit the roll paper, all you have to do is drop the roll paper into the storage box, it is easy to operate, and when the diameter of the roll paper stored in the storage box is large and the weight is heavy, the roll paper is rotatably supported. It is supported by rollers and the frictional force when feeding the recording paper can be reduced. Therefore, as a motor for feeding the recording paper from the roll paper, an inexpensive and small motor can be used, and the support roller simply rotates. freely Since the roll paper is a roll paper, and the support roller is simply a rotatable roller, the structure is simple and the cost of the apparatus can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic inner side view showing a recording apparatus equipped with a roll paper mounting apparatus according to an embodiment of the present invention, and FIG. 2 is its II-II.
FIG. 3 is a cross-sectional view taken along the arrow, FIG. 3 is a graph showing the relationship between the remaining amount of roll paper and the torque required for feeding the recording paper, and FIG. 4 is a schematic inner side view of the conventional recording apparatus. 10 ... Roll paper, 11 ... Roll paper loading device, 12 ... Recording paper, 13
... recording head, 14 ... recording roller, 15 ... recording motor, 17 ...
Storage box, 17a ... Front wall, 17b ... Bottom wall, 18 ... Support roller, 19 ...
Axis of rotation.

Claims (1)

[Claims] 1. A storage box provided with a front wall for contacting roll paper, and a roll of paper which is mounted in the storage box so as to contact the front wall, and which is located behind the center of the roll paper. A roll paper loading device having a rotatable support roller arranged at the bottom of the storage box and parallel to the axis of the roll paper so as to support the roll paper.