JP2000109248A - Printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding mechanism that can wind up recording paper stably despite a simple structure free from a higher precision in parts and assembly, and a printer that uses the winding mechanism. SOLUTION: A printer 1 uses a winding mechanism 5 mounted at the back of a printer body 4 to wind up such recording paper 7 as journal paper. The winding mechanism 5 has a paper winding shaft 23 that is cantilevered from a support plate 24 and that is provided with a take-up flange 25 on its side of the support plate 24. After passing a writing desk 22, the recording paper 7 out of a discharge opening 21 is taken up on the paper winding shaft 23. The take-up flange 25 is inclined at an angle of from 0 deg. to 5 deg. to the recording paper 7 in the paper feed direction so that its outermost surface is in the flange- side feed line of the recording paper 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding mechanism for winding recording paper such as journal paper, and a printer using the same.

[0002]

2. Description of the Related Art For the purpose of managing sales and inventory at stores and the like, it has been widely used to store journal paper on which sales prices, product names, and the like are printed. 2. Description of the Related Art A printer configured to take up journal paper on a take-up shaft has been proposed.

FIGS. 7 and 8 show the principle of winding the recording paper 106 by a winding mechanism 105 used in this printer.

In FIG. 7, the distance between the paper feeding means 107 and the winding portion of the winding shaft 109 is configured to be the same over the entire width of the recording paper 106, and the winding force f
The take-up reaction force r1 generated by 1 works uniformly on each portion in the paper width direction so that the recording paper 106 does not meander.

On the other hand, in the case of the conventional example shown in FIG.
09 is tilted so that the paper path length at the end without the winding flange 111 is the longest, and the component r3 of the winding reaction force r2 toward the winding flange 111 generated by the winding force f2 of the winding shaft 109. Is generated so that the recording paper 106 is pressed against the winding flange 111 (for example, see Japanese Utility Model Publication No. 64-1313). According to this configuration, the edge of the recording paper 106 is wound. It can be wound up in alignment with the flange 111.

[0006]

However, such a conventional winding mechanism has the following problems.

That is, in the case of the conventional example shown in FIG. 7, in order to prevent the recording paper 106 from meandering, the winding force N1 in the paper feeding portion must be equal in each portion of the recording paper 106 in the paper width direction. In order to do so, a high degree of component accuracy and assembly accuracy is required, which causes an increase in cost.

On the other hand, in the case of the conventional example shown in FIG. 8, since the winding force f2 concentrates on one end of the recording paper 106 in the width direction of the recording paper 106, the recording paper 106 Winding force N2 on one end
Act, the portion is pulled, and the portion 106a on the opposite side is loosened. As a result, the recording paper 106 may meander. When the recording paper 106 meanders, the winding flange 11
A phenomenon such as being strongly pressed or not being pressed occurs. When the recording paper 106 is strongly pressed, the end of the recording paper 106 on the take-up flange side is broken, and the winding diameter at the end becomes larger than the other end.
3, the recording paper 106 cannot be pressed sufficiently against the winding flange 111,
Winding torque cross occurs due to the end surface breaking load on the winding. Further, the recording paper 106 is wound while being slid in the direction of the smaller winding diameter due to the difference in the winding diameter.
Swelling that becomes larger than the outer shape of the winding flange,
The rolled-up recording paper 106 protrudes in a direction where there is no winding flange 111 and is rolled up. The same problem as described above also occurs when it is not pressed against the winding flange 111.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems of the prior art, and it is an object of the present invention to provide a simple structure without requiring a high degree of component precision and assembly precision. An object of the present invention is to provide a winding mechanism capable of stably winding recording paper and a printer using the same.

[0010]

According to a first aspect of the present invention, there is provided a winding shaft for winding a recording sheet conveyed through a printing unit, and one end in a width direction of the recording sheet. A winding shaft disposed above the roll paper before printing, and a flange of the recording paper upstream of the winding shaft of the recording paper path. And a paper guide having a first regulating surface in contact with the first side end and a second regulating surface in contact with the opposite side end, and a paper guide for regulating movement of the recording paper in the width direction. The take-up shaft is mounted so that the take-up shaft portion is inclined with respect to the paper path on the downstream side of the paper guide so as to shorten the conveyance length of the recording paper on the flange side, and the contact surface of the flange portion is provided. The outer diameter of the paper guide side is set on the same plane as the plane including the first regulating surface or on the recording paper side from the same plane. And wherein the are.

According to the above configuration, the take-up flange is always in contact with the recording paper, and the recording paper is slightly meandered, so that the winding quality is ensured. Further, since it is not necessary to consider applying a uniform force to each portion of the recording paper in the paper width direction, a high degree of component precision and assembly precision is not required.

Further, the inclination angle of the winding shaft is more than 0 degree and 5 degrees.
Degrees or less.

With the above construction, the contact pressure between the recording paper and the flange can be set within a range where the end face of the recording paper does not break, and tension is generated on the recording paper at the winding flange contact portion. A pressing force is applied to the flange, and stable winding quality along the winding flange can be secured. This is appropriate from experimental values,
It is even better if it is twice or less.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a winding mechanism according to the present invention and a printer using the same will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an overall configuration of an embodiment of a printer according to the present invention, FIG. 2 is a plan view of the printer of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line CC of FIG.

As shown in FIG. 1, a printer 1 according to this embodiment
Is a two-sheet printer incorporated in a cash register or the like, and includes a printer main body 4 including a printing mechanism 2 and a paper feeding mechanism 3, and a winding mechanism 5 provided behind the printer main body 4.

In FIG. 2 and FIG. 4, recording paper 7 such as journal paper stored in a store for sales and inventory management.
Is arranged at a lower rear portion of the printer main body 4, and the leading end thereof reaches a printing position through a paper path 20 from a paper feed port 17 where movement of the recording paper 7 in the width direction is restricted. . The printed recording paper 7 is conveyed from a discharge port 21 where the movement of the recording paper 7 in the width direction is restricted, through a writing table 22 provided above the paper feeding mechanism 3, and It is wound on the winding shaft 23 of the winding mechanism 5 attached to the rear part. In the present embodiment, the paper guide includes the paper feed port 17 to the discharge port 21, the first regulating surface is a contact surface of the paper feed port 17 and the discharge port 21 on the flange 111 side, The regulating surface is a contact surface on the opposite side of the sheet supply port 17 and the discharge port 21 from the flange 111.

The take-up shaft 23 is rotatably supported by a support plate 24 fixed to the rear of the printer body 4 in a cantilever manner, and a disk-shaped take-up flange 25 is fixed to the support plate 24 side. Have been. The take-up shaft 23 is driven to rotate by meshing between a gear group 28 that is driven to rotate by a take-up belt 27 that is linked to the paper feed mechanism 3 and a gear 26 that is fixed to the end of the take-up shaft 23. It has become.

The winding shaft 23 is inclined so that the outermost periphery of the winding flange 25 enters the paper path of the recording paper 7. This inclination angle differs depending on the paper type, paper thickness of the recording paper 7 and the use environment of the printer, particularly the humidity environment. In the case of the use environment of about 60% of the humidity of the recording paper generally used in the cash register. Of winding shaft 2
The inclination angle of 3 is set so as to sufficiently absorb variations in normal component accuracy and assembly accuracy, etc., and is arranged so that the winding flange 25 and the recording paper 7 are always wound in contact with each other. A good winding quality can be obtained. Further, when considering the high humidity state in the high temperature state, the inclination θ of the recording paper 7 and the take-up flange 25 with respect to the paper feeding direction is set in a range of more than 0 ° and 5 ° or less. The above values are appropriate from the experimental values, and more preferably, 2 degrees or less. On the other hand, when it exceeds 5 degrees, the contact pressure between the recording paper and the flange was increased, and the end face of the recording paper was broken.

FIG. 5 illustrates the principle of the present invention.

Here, in order to facilitate understanding,
The case where the left and right paper path lengths 22a and 22b of the writing table 22 are the same will be described as an example.

As shown in FIG.
Is disposed in the paper path of the recording paper 7. In this case, the length of the inclined surface of the writing table 22 is set at the center of the writing table vertex 22c, and the length corrected in the winding direction is defined as the paper path reference. 23 is a line connecting the take-up flange 23 and the take-up flange 23a. This line is the end surface of the recording paper 7 on the take-up flange side, and the take-up shaft 23 is inclined with respect to this end surface so that the outermost periphery of the take-up flange is within the paper width of the recording paper 7.

In the case of the present embodiment, the amount X entering the paper path
Is a quantity in consideration of the component accuracy and the assembly accuracy.
Receives the winding force F at the outermost peripheral portion of the winding flange 25 and generates a component force R.
It is wound up along.

Further, in a configuration assuming a high humidity state, the winding flange 2 and the line connecting the recording paper 7 and the outermost periphery of the winding flange 25 based on the above-described paper path are used.
Experiments have confirmed that good winding quality can be obtained by setting the inclination θ of the No. 5 with respect to the paper feeding direction in the range of 0 ° to 5 °. With this setting, the end face does not break even in a high humidity state.

FIG. 6 is a diagram showing a setting method of the winding shaft when the left and right paper path lengths 22a and 22b of the writing table 22 are set to different lengths.

As shown in FIG. 6, the left and right paper path lengths 22a and 22b of the writing table 22 are set to different lengths. Also in this case, the method of obtaining the paper path reference is the same as described above, and the paper path reference is obtained by correcting the flange side path length 22a of the writing table in the same manner as described above, and the winding shaft 23 is obtained.
By setting the amount of inclination of, the same effect as described above can be obtained. Further, in this case, the entire paper path length from the discharge port 17 to the winding flange side of the winding shaft 23 and the other side can be adjusted by the writing table path lengths 22a and 22b. For example, in the example of FIG. The total paper path length on the flange side is set shorter than the other. In this case, problems such as unnecessary lifting of the recording paper and meandering of the recording paper easily occur as shown in FIG. 8 of the related art, and the amount X entering the paper path in the present embodiment and FIG. are doing. On the other hand, FIG.
As shown in the example, the writing table path length 22b is set so that the setting of the total path length does not reverse.
If the length is set longer, unnecessary lifting of the recording paper described above can be prevented, and extreme meandering of the recording paper can be suppressed, so that the winding shaft can be arranged with a sufficient accuracy.

Furthermore, in the case of the present embodiment, it is not necessary to consider that a uniform force is applied to each portion of the recording paper in the paper width direction, so that a high degree of component precision and assembly precision are not required. Therefore, according to the present embodiment, it is possible to reduce the unit cost and the assembly cost.

In the above-described embodiment, the type in which the take-up shaft 23 of the take-up mechanism 5 is cantilevered has been described as an example. However, the present invention is not limited to this. The same applies to those that are supported. However, this is most effective when the winding shaft of the winding means is cantilevered as in the above-described embodiment.

Further, the present invention is applicable not only to dot impact printers but also to various printers such as, for example, type printers, thermal printers and ink jet printers.

[0030]

As described above, according to the winding mechanism of the present invention, the recording paper and the winding flange can always be brought into contact with each other and can be wound with an appropriate pressing force. It is possible to obtain a good winding quality without sticking out.

Therefore, according to the present invention, it is possible to inexpensively provide a printer which has a high winding quality and can stably wind the recording paper.

Further, according to the present invention, since the arrangement of the recording paper and the winding shaft for obtaining good winding quality is quantitatively clarified, an enormous amount of time and cost have conventionally been required.
This greatly improves the efficiency of mechanism development.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an overall configuration of an embodiment of a printer according to the present invention.

FIG. 2 is a plan view of the printer of FIG.

FIG. 3 is a view (side view) in the direction of arrow B in FIG. 2;

FIG. 4 is a sectional view taken along line CC of FIG. 2;

FIG. 5 is an explanatory view showing the principle of the present invention.

FIG. 6 is a diagram illustrating a winding shaft setting method according to the present invention.

FIG. 7 is an explanatory diagram showing a principle of winding a recording paper by a winding mechanism according to a conventional example.

FIG. 8 is an explanatory view showing a principle of winding a recording sheet by a winding mechanism according to another conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 printer 2 printing mechanism 3 paper feed mechanism 4 printer main body 5 winding mechanism 7 recording paper 17 paper feed port 20 paper path 21 discharge port 22 (22a, 22b, 22c) writing table 23 winding shaft 24 support plate 25 winding flange 26 gear 27 take-up belt 28 gear group F take-up force R component force X amount entering paper path

Claims (2)

[Claims] An image forming apparatus comprising: a winding shaft for winding recording paper conveyed through a printing unit; and a flange having a contact surface with which one end in the width direction of the recording paper comes into contact. A take-up shaft arranged above the rolled paper before being wound, and a first regulating surface and an opposite side that are in contact with the flange-side end of the recording paper upstream of the take-up shaft in the recording paper path. And a paper guide for restricting the movement of the recording paper in the width direction, wherein the winding shaft is provided with the flange of the recording paper. The take-up shaft portion is mounted obliquely with respect to the paper path on the downstream side of the paper guide so as to shorten the transfer length of the paper guide, and the abutting surface of the flange portion on the paper guide side of the contact surface The outer diameter is located on the same plane as the plane including the first regulating surface or on the recording paper side from the same plane. Printer, characterized in that it is fitted. 2. The inclination angle of the winding shaft is more than 0 degree and 5 degrees.
2. The printer according to claim 1, wherein the temperature is equal to or less than the temperature.