JP2000272787A - Roll paper housing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the end surface breakage or wrinkling of a paper by supporting one of guide rollers in such a manner that the distance between flanges is movable to the other, and energizing it to the other guide roller side. SOLUTION: In the guide roller mechanism part of a roll paper housing device 1, a roller shaft is suspended on a holder frame 11, and two guide rollers 13 and 14 are arranged on both sides. The space W1 between flanges 13b and 14b is set to be surely slightly smaller than the width W of a roll paper, and the space W2 where a compression coil spring 16 is compressed to maximize the space between the flanges 13b and 14b is set to be surely larger than the roll paper width W. Therefore, when the roll paper R is fallen onto the guide roller part from above, the roll paper R is surely nipped by the flanges 13b and 14b without slippage, and the end surface breakage or wrinkling of the paper R can be also prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a POS (Point
t-of-sales) The present invention relates to a roll paper storage device incorporated in a device or the like.

[0002]

2. Description of the Related Art Conventionally, various roll paper storage devices having a structure in which roll paper serving as a print medium is placed and stored in a roll paper receiving portion have been proposed, and an example thereof will be described with reference to FIG.
A roller 91 is rotatably attached to a roll paper receiving surface inside the housing 90 by snap fitting. It is the side wall 92 that regulates the width direction of the roll paper, and the distance L inside the side wall 92 is larger than the width of the roll paper to be used.
It is set slightly larger. This is because the width of the roll paper varies depending on the process variation at the time of cutting and the humidity, and the side wall is set in consideration of the variation.
When the roll paper is put into the roll paper storage device in the figure, the outer peripheral surface of the roll paper comes into contact with the roller 91 and is held. When the roll paper is fed, the roller 91 rotates following the rotation of the roll paper. Therefore, the occurrence of rubbing marks is small, and the frictional load during paper feeding is reduced. Generally, this type of roll paper storage device is called a throw-in type.

[0003]

However, in the above-described throw-in type roll paper storage device, for example, the roll paper may be shifted in the width direction in the device as shown in FIG. The shift is indicated by X in the figure. The biggest factor is that the width of the side wall that regulates the width direction of the roll paper is larger than the width of the roll paper, but when using roll paper with a small friction coefficient such as coating the paper surface,
This is particularly noticeable.

By the way, when the paper is displaced in this way, the displaced portion hits the side wall, and the end of the paper breaks,
It may wrinkle. Such paper folds and wrinkles not only cause the appearance of the paper on which the data is printed to be not beautiful, but also cause the paper to stretch in the paper storage unit, increasing the paper load, and causing the paper feed pitch due to the friction load. ,
Printing failure may occur.

Accordingly, the present invention is to provide a roll paper storage device capable of preventing the end face of the paper from being broken or wrinkled, and capable of smoothly drawing out the paper.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a storage section for storing a roll of recording paper wound in a roll shape, and a cylindrical section which is in contact with an outer peripheral portion of the roll paper. And a pair of guide rollers rotatably disposed in the storage section so that the flanges face each other. One guide roller is movably supported with respect to the other guide roller so that the distance between the flanges can be changed, and is biased toward the other guide roller.

According to the above configuration, since the roll paper is sandwiched between the flange portions, the paper does not shift in the width direction at the time of paper feeding, and the load is increased because the guide roller is driven. Not even.

Further, according to the present invention, the guide roller is arranged so as to receive the recording paper on the side opposite to the rewind position where the recording paper is rewound from the roll paper. The opposite side of the paper feed direction is a position where the roll paper strongly contacts during paper feed, and the guide roller works effectively.

Further, according to the present invention, the guide roller is provided on a movable member whose position changes in accordance with the weight of the roll paper, and the guide roller has a direction of gravity with respect to the center of the roll paper. It is desirable that the angle formed is between 30 degrees and 55 degrees.

In this configuration, even if the diameter of the roll paper changes, the position where the roll paper is received by the guide roller is the optimum position.

Further, according to the present invention, a guide roller supporting member that supports the guide roller and receives the urging force of the urging member via the guide roller, the urging member, and the pair of guide rollers are integrated. You may be comprised so that it may rotate. With this configuration, the paper feeding load does not increase due to the urging force.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a roll paper storage device according to the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view of a roll paper storage device 1 according to a first embodiment of the present invention. A roller shaft 12 is suspended on a holder frame 11 made of resin in the width direction of the roll paper. A guide roller 13 is rotatably supported by the guide roller 13. The upper part of the roll paper storage device is open, and the roll paper R is dropped from above. Then, the roll paper R is guided by the guide roller 13 and the receiving surface 11 of the holder frame 11.
Supported by a. By the paper feeding means of the printer mechanism 2, the roll paper R is pulled in the direction of arrow A while being unwound. Then, the roll paper R rotates in the arrow B direction.
At this time, the roll paper R strongly contacts the guide roller 13,
The guide roller 13 rotates following the rotation of the roll paper R. As described above, the roll paper R is received by the guide roller 13 and rolls, so that rolling friction occurs, and the load when the roll paper R is pulled is reduced. Note that there is no roller on the surface that receives the roll paper R in the direction of arrow A, that is, the receiving surface 11a, but when the roll paper R is pulled in the direction of arrow A, the outer peripheral surface of the roll paper R moves away from 11a. No strong pressure is applied to the surface 11a. Therefore, as shown in FIG. 1, it is effective to arrange the guide roller 13 at the rear.

When the roll paper R becomes small in diameter, it separates from the guide roller 13 and becomes a groove 1 provided in the holder frame 11.
1b. The roll paper at the time of small diameter is denoted by R1. When the diameter of the roll paper is small, the weight of the roll paper is light and the load is small even in sliding friction. By arranging the detecting means in the groove 11b, it is possible to detect that the roll paper has become small in diameter, and it is possible to notify the roll paper replacement time before the roll paper R runs out.

Next, the mechanism of the guide roller will be further described with reference to FIG. FIG. 2 is a cross-sectional view of the guide roller cut in a diameter direction. The roller shaft 12 is the holder frame 1
1 and two guide rollers 13 and 14 are arranged on both sides. The guide roller 13 has a slight play and is restricted in the axial direction by being sandwiched between the E-shaped retaining ring 15a and the holder frame 11. The other guide roller 14 is also regulated by the E-shaped retaining ring 15b so as not to enter inside in the axial direction, but the position of the guide roller 14 can be moved to some extent in the axial direction (the direction of the arrow C1-C2). I have. A guide roller 14 and a compression coil spring 16 are inserted into the roller shaft 12 between the E-shaped retaining ring 15b and the holder frame 11, and the guide roller 14 is always urged in the direction of arrow C2. Each guide roller has flange portions 13b and 14b, and portions for receiving the roll paper R are cylindrical portions 13a and 14a.
FIG. 2 shows a state before the roll paper R is set, that is, a state where the roll paper R has not entered the roll paper storage device 1.

Here, the flanges 13b, 14 shown in FIG.
The interval W1 of b is set to be slightly smaller than the width W of the roll paper. The interval W2 when the compression coil spring 16 is compressed and the interval between the flanges 13b and 14b is maximized is more reliably than the width W of the roll paper. Is set to be larger. For example, roll paper width W = 57.5 ± 0.5
mm, W1 = 55 ± 0.5 mm, W2 = 60 ± 0.5
mm and so on.

When the roll paper R is dropped onto the guide roller portion from above, the roll paper R is placed on the flanges 13b and 14b.
Sandwiched between. In FIG. 1, the roll paper R is held at the abutting portion S in a range indicated by hatching. For this reason, the roll paper R does not cause the paper misalignment as shown in FIG. 7, and the end face of the paper does not break or become a load. In the present invention, the guide roller is provided at one location behind the roll paper R, and the contact portion S is also provided at one location. This is because it is the most stable that one part is securely inserted, and when setting the roll paper R, only this part is adjusted.
This is because it is easy to set the shape of the roll paper storage device because it can be inserted, and the operator does not need to pay careful attention when setting the roll paper.

Next, a second embodiment will be described with reference to FIG. The second embodiment is another example of the guide roller mechanism. In the guide roller mechanism of FIG.
Although the rotations 3 and 14 are performed, a load is applied to the holder frame 11 by the compression coil spring 16. Therefore, the second embodiment shows a structure in which a load is not applied to the holder frame.

The left and right guide rollers 23 and 24 are pulled inward by a tension coil spring 26 so that the inner width becomes W1, and the guide rollers 23 and 24 and the tension coil spring 26 rotate integrally. Therefore, no load is applied to the holder frame 21 by the spring force.

In the first embodiment shown in FIG. 1, when the roll paper R becomes smaller in diameter, the roll paper R jumps out in the paper feed direction, that is, the direction of arrow A, and
In some cases. This is guide roller 1
This is because the angle D at which the roll paper 3 receives the roll paper R increases, and the weight of the roll paper R does not sufficiently fall on the guide roller 13. Usually, when the angle D is larger than 55 degrees, such a phenomenon is particularly likely to occur.

To solve this problem, the roll paper R may be supported so that the angle D is maintained at an ideal value even when the outer diameter of the roll paper R changes. Therefore, this solution will be described with reference to the following third embodiment.

FIGS. 4 and 5 show a roll paper storage device according to a third embodiment. First, the case where the roll paper has a large diameter is shown in FIG. The angle D0 of the guide roller receiving the roll paper R is set to 40 degrees. If the angle D0 is too small, the roll paper R easily rolls and returns in the direction of arrow B during paper feeding, and the position becomes unstable.

Normally, if D0 is set to 30 degrees or more, stable paper feed can be obtained, although it depends on the type of roll paper, paper feed conditions, and the type of guide roller. Guide roller 13
Is disposed on a roll paper holder 17, and the roll paper holder 13 is rotatably supported in a range around a fulcrum 18. The spring 19 receives the roll paper holder 17. The spring 19 is compressed and deformed by the weight of the roll paper R.

Next, FIG. 5 shows a state in which the paper feed advances and the roll paper R has a small diameter. Since the roll paper R1 is lighter than the roll paper R in FIG. 4, the spring 19 is extended, and the roll paper holder 17 rotates in the direction of arrow C. Thus, the angle D1 for receiving the roll paper R1 is kept at 40 degrees.

In the structure in which the roll paper holder 17 is fixed, as the roll paper diameter decreases, the angle D1 becomes 55 degrees or more, and the roll paper R1 easily comes off the guide roller 13. As described above, in the third embodiment, since the angle at which the roll paper is received by the guide roller is maintained between the ideal values of 30 degrees to 55 degrees, the roll paper is stably sandwiched between the guide rollers. State can be maintained.

Further, since the roll paper is sandwiched between the guide rollers at only one position, the roll paper is hardly displaced and is stable. Even when the operator sets the roll paper, only this portion needs to be adjusted, and the work is easy. .

[0027]

As described above, in the present invention, one guide roller of the pair of guide rollers is movably supported with respect to the other guide roller so that the distance between the flanges can be changed, and the other guide roller is supported. The roller is biased toward the guide roller side so that the outer periphery of the roll paper is elastically sandwiched in the width direction and the paper is not displaced when the paper is fed. No more load. Further, the end face of the paper is not broken and the appearance of the recording paper is not spoiled.

Further, according to the present invention, the guide roller is disposed so as to receive the recording paper on the side opposite to the rewind position where the recording paper is rewound from the roll paper. This is the contact position, and the guide roller works effectively.

Further, according to the present invention, the position of the movable member receiving the guide roller changes due to the weight of the roll paper, and even if the roll paper changes from a large diameter to a small diameter, the guide roller holds the roll paper at the optimum position. Since the sheet is pinched, the behavior of the roll sheet is stable, and the roll sheet is not easily detached from the guide roller.

Further, according to the present invention, the urging force for sandwiching the roll paper does not act on the side wall of the frame and the like. There is no need to increase the feed force.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a roll paper storage device according to the present invention.

FIG. 2 is a sectional view showing a guide roller unit of the same roll paper storage device as in FIG.

FIG. 3 is a sectional view showing a guide roller unit according to a second embodiment of the present invention.

FIG. 4 is a sectional view showing a roll paper storage device according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view of the same roll paper storage device as in FIG. 4 when the roll paper diameter is small.

FIG. 6 is a perspective view showing a conventional roll paper storage device.

FIG. 7 is a perspective view showing a paper misalignment occurring in a conventional roll paper storage device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roll paper storage device 2 Printer mechanism part 11 Holder frame 12 Roller shaft 13, 14 Guide roller 15 E type retaining ring 16 Compression coil spring 17 Roll paper holder 19 Spring R Roll paper

Claims (4)

[Claims] 1. A storage section for storing roll paper on which recording paper is wound in a roll shape, a cylindrical section abutting on an outer peripheral portion of the roll paper, and a flange section abutting on a side face of the roll paper. A pair of guide rollers rotatably disposed in the storage portion such that the flanges face each other, wherein one of the pair of guide rollers is between the flange and the other. The roll paper storage device is supported movably so that the distance of the roll paper can be changed, and is urged toward the other guide roller. 2. The roll according to claim 1, wherein the guide roller is arranged to receive a side opposite to a rewind position where the recording paper is rewound from the roll paper. Paper storage device. 3. The guide roller is provided on a movable member whose position changes according to the weight of the roll paper, and the guide roller has an angle of 30 degrees with the center of the roll paper with respect to the direction of gravity. 3. The roll paper storage device according to claim 2, wherein the roll paper storage device is disposed between the angle of 55 degrees and 55 degrees. 4. A guide roller supporting member that supports the guide roller and receives the urging force of the urging member via the guide roller, the urging member, and the pair of guide rollers rotate integrally. The roll paper storage device according to claim 1, wherein: