JPH09104551A - Transfer film cassette and method for winding film on small winding reel in this transfer film cassette - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a problem of a wrinkle in a transfer film caused by a tape thickness and a step difference generated in an edge, by connecting a winding start part of the transfer film to a reel surface by a bonding agent layer formed on the periphery of a reel. SOLUTION: A reel 1 is supported turnably around an axial line in a casing, a transfer film 4 of prescribed length with a prescribed number of image planes is wound on the periphery of the reel 1, so as to constitute a transfer film cassette. Here, a dispenser 3, while holding a fixed clearance from a surface of a small winding reel 1, is moved at a fixed speed in an axial direction of the reel 1, so as to form a linear bonding agent layer 2 of fixed width with a fixed application thickness, thereafter the transfer film 4 is bonded to a surface of the reel 1. In this way, a problem of a wrinkle of the transfer film, caused by a tape thickness and a step difference generated in an edge, can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for adhering an end portion of a strip-shaped film, which is fed from an original roll, to a small winding reel when the film is wound by a predetermined length. . As the film, a thermal transfer film used in a video printer or the like is represented. The present invention also relates to a transfer film cassette using the small winding reel obtained by the above improvement.

[0002]

2. Description of the Related Art A thermal transfer film cassette is generally used in order to facilitate the loading of a thermal transfer film into a thermal transfer printer, and the cassette is a web of thermal transfer film wound on an original roll. It has been printed, for example, it continuously has one screen consisting of a colored pattern in which four colors of black, cyan, magenta, and yellow are juxtaposed in succession) on one reel and the other reel. Glue the ends of the wound web,
It is created by housing this in a casing having a predetermined shape.

When the web of the heat-sensitive transfer film wound on the material roll is fed out by a predetermined number of screens and for a predetermined length and wound around the reel in a small winding operation, the surface of the reel (or a predetermined position on the web) is previously set. It is designed so that the cutting front end portion of the web is attached to the "double-sided adhesive tape" attached to, and the winding is started. The following is an example of a small winding method using a double-sided adhesive tape.

[0004] Japanese Unexamined Patent Publication No. 1-321265 [Patent Document 1] Japanese Unexamined Patent Publication No. 1-321265 A "double-sided adhesive tape" is adhered to a film which is to be wound small, and the film is attached to a reel (bobbin) for small winding, and then the film on the tip side of the tape is cut Method.

[0005] Japanese Patent Laid-Open No. 4-65595 SUMMARY OF THE INVENTION [0005] Air is blown to the tip portion of the heat-sensitive transfer film protruding from the "double-sided adhesive tape" that is affixed to the small reel (bobbin) in advance, and the protruding portion is reeled A method of pressing small pieces to perform small winding work.

By bending the transfer film (protruding portion of about several mm) on the tip side of the double-sided adhesive tape,
The above conventional technique solves the problem that a step is formed on the transfer film to be wound and wrinkles are caused thereby. The "small winding method using a double-sided adhesive tape" exemplified in the above-mentioned conventional technique has the following problems.

Even if it is possible to avoid the problem of the small winding step caused by winding the film on the tip side of the tape in a bent state as in the prior art described above, the small winding caused by the structure of the double-sided adhesive tape itself. The problem of the difference in level will remain. That is, the double-sided pressure-sensitive adhesive tape has a structure in which an adhesive is applied and formed on both surfaces of the core material (or,
Since the core material is impregnated with an adhesive) and the core material itself has a certain thickness, there is inevitably a step from the beginning at the tape sticking point and its surroundings. The film wound on the reel may have a step corresponding to the edge portion of the tape, which may result in trace marks on the film.

Further, in the double-sided adhesive tape, the location where the adhesive is formed depends on the shape of the tape itself from the beginning, and it is necessary to prepare a tape having an appropriate shape and size by cutting beforehand. The work also becomes troublesome.

[0009]

DISCLOSURE OF THE INVENTION The present invention has the above-mentioned problem of the "small winding method using a double-sided pressure-sensitive adhesive tape", that is, a problem of a step of the film due to the thickness of the tape. The problem that the location where the adhesive is formed cannot be set freely. It is an object of the present invention to provide a small winding method capable of solving the above problems and a transfer film cassette manufactured by the method.

[0010]

In the present invention, a liquid adhesive is used for sticking a transfer film to a small winding reel, without using a "double-sided adhesive tape".

That is, according to the invention of claim 1, a reel is supported in a casing having a predetermined shape so as to be rotatable about its axis, and a predetermined number of screens are provided on the outer periphery of the reel.
In a transfer film cassette having a structure in which a transfer film having a predetermined length is wound, a winding start portion of the transfer film is bonded to the reel surface by an adhesive layer formed on the outer circumference of the reel. Is characterized by.

According to a second aspect of the present invention, there is provided a method of winding a strip-shaped film continuous in one direction for a predetermined length on a reel for small winding, wherein a predetermined thickness, a predetermined width, and a predetermined width are provided on the outer circumference of the reel. The method is characterized by comprising a step of directly applying and forming a liquid adhesive having a predetermined length in a linear shape extending along the axial direction.

In forming the liquid adhesive by coating,
An existing dispenser drives the nozzle according to the shape of the adhesive layer.

It is more effective in avoiding the influence of a step difference that the winding start portion of the transfer film is brought into contact with the adhesive on the surface of the reel and then the adhesive is thinly spread by pressing the film with a roller or the like. .

At this time, if the adhesive protrudes from the edge of the transfer film, the next overlapping transfer film will be stuck, and if the adhesive is too far from the edge of the transfer film, the adhesive will Due to the transfer film on the leading end side being bent, a step is formed on the transfer film to be wound, and wrinkles are generated on the transfer film.

Therefore, the adhesive on the reel surface is bonded in the vicinity of the edge portion of the transfer film, and an appropriate amount of the adhesive is applied to an appropriate position so that the adhesive does not overflow even if the adhesive is thinly spread by pressing. It is necessary to form by coating.

[0017]

Since only the liquid adhesive having no core material is used, the steps and wrinkles of the transfer film due to the "tape thickness and edge shape", which are problems when using the double-sided adhesive tape, are eliminated. Further, by properly driving the dispenser, the application amount / application position (shape) can be strictly controlled.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. <Basic operation> By moving the dispenser 3 in the axial direction of the reel 1 at a constant speed while maintaining a constant clearance from the surface of the small winding reel 1, a linear coating having a constant coating thickness and a constant width is formed. The adhesive layer 2 can be formed. (See Fig. 1)

As the adhesive to be used, it is preferable to use a soft adhesive that does not have an excessively high viscosity so that the application amount and the application position can be strictly controlled and spread by pressing is easy.
As an adhesive that can be put to practical use, one having a viscosity of about 1000P is suitable. To form the adhesive layer with a predetermined thickness, width, and length by applying an adhesive having the viscosity described above by a dispenser. It is preferable to use the method described below.

<Applied Operation 1> When forming a coating with a dispenser, the dispenser 3 is moved while supplying a fixed amount of adhesive from a nozzle, so that the coating start and coating end portions (that is, both end portions of the reel 1) are applied. The amount of application becomes large (a liquid is easily accumulated), and it is easy to create the cause of the adhesive squeezing out later. (See FIG. 2) Then, by driving the dispenser 3 so as to operate as shown in FIG. 3, a constant adhesive layer is formed from the start end to the end. That is, the coating start portion (A to
In B), the clearance of the central portion is gradually approached to reduce the amount of adhesive adhered to that portion. In addition, in the coating end portion (C to D), the amount of adhesive adhered to the portion is gradually reduced by gradually moving away from the constant clearance in the central portion.

<Applied Operation 2> In order to make the formed adhesive layer 2 thin (or to make the thickness of the adhesive layer 2 more uniform), as shown in FIG. 4 or FIG.
At the start of winding the transfer film 4, the pressing roller 5 is pressed from above the transfer film 4 stretched with a constant tension.
Is brought into contact with the reel 1 and pressed along the outer periphery of the reel 1.

FIG. 4 is a cross-sectional explanatory view showing the above operation in the order of steps as seen from the axial direction of the reel 1. The adhesive layer 2 is linearly extended on the outer periphery of the reel 1 in a direction perpendicular to the plane of the drawing. After the application and formation (a), the transfer film 4 stretched with a constant tension is brought into contact with the reel 1 (b), the pressing roller 5 is brought into contact with the reel 1 from above the transfer film 4 (c), and the pressing roller is pressed. The transfer film 4 is pressed by rolling 5 around the outer circumference of the reel 1.

FIG. 5 is a sectional view similar to FIG. 4, seen from the axial direction of the reel 1, in which the adhesive layer 2 is applied to the outer periphery of the reel 1 in a linear shape extending in the direction perpendicular to the paper surface. After being formed (a), the transfer film 4 stretched with a constant tension
With the reel 1 (b), the pressing roller 5 is brought into contact with the reel 1 from above the transfer film 4, and the pressing roller 5
Roll along the outer circumference of the reel 1 to transfer the transfer film 4
Is pressed (c).

As a result, the transfer film 4 is adhered to the surface of the reel 1 cleanly and without wrinkles, and the problem of a step due to the adhesive layer does not occur.

In the case of FIG. 4, the adhesive layer is formed on the vertical central axis, and the adhesive layer is spread to the left and right of the central axis by pressing the transfer film. In the case of 5, the adhesive layer was previously formed by coating (on the right side) with the vertical center axis removed, so that the adhesive layer would not spread to the left side of the center axis (in other words, on the right side). It is designed to spread only). That is, in FIG.
Since the shape (line) of the spread adhesive layer can be clarified at the left end, it becomes easy to accurately determine the length of the effective area of the transfer film that is continuous from the winding start portion to the left side.

Although not shown, the transfer film 4
After pressing, the tip side (Fig.
-In FIG. 5, the transfer film 4 on the right side of the central axis)
Is cut with a cutter or the like to form a winding start portion of the transfer film.

[0027]

EFFECT OF THE INVENTION The problem of wrinkling of the transfer film due to the thickness of the tape and the level difference caused by the edge, which has been a problem when the double-sided adhesive tape is used, is solved. Further, by appropriately driving the dispenser, the application amount and application position (shape) of the adhesive can be strictly controlled, and the adhesive formation location can be freely set. The transfer film cassette obtained according to the present invention does not cause wrinkles on the transfer film, and therefore does not affect the transferred image.

[0028]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an outline of a method of applying and forming an adhesive on the surface of a reel.

FIG. 2 is an explanatory view showing an example of an adhesive layer formed by coating.

FIG. 3 is an explanatory diagram showing an outline of a method of applying and forming an adhesive on the surface of a reel.

FIG. 4 is an explanatory cross-sectional view showing a winding start state of a transfer film.

FIG. 5 is an explanatory cross-sectional view showing a winding start state of the transfer film.

[Explanation of symbols]

 1 ... Small winding reel 2 ... Adhesive layer 3 ... Dispenser 4 ... Transfer film 5 ... Pressing roller

Claims (3)

[Claims] 1. A structure in which a reel is supported rotatably around its axis in a casing having a predetermined shape, and a transfer film having a predetermined number of screens and a predetermined length is wound around the outer periphery of the reel. In the transfer film cassette, the winding start portion of the transfer film is configured to be joined to the reel surface by an adhesive layer formed on the outer circumference of the reel. 2. A method of winding a strip-shaped film continuous in one direction for a predetermined length on a small-winding reel, the liquid having a predetermined thickness, a predetermined width, and a predetermined length on the outer periphery of the reel. A method for winding a film around a small winding reel, comprising a step of directly applying and forming an adhesive in a linear shape extending along an axial direction. 3. The method according to claim 2, further comprising the step of spreading a liquid adhesive between the film and the reel after bringing the winding start portion of the film into contact with the small winding reel. How to wrap the film on the small reel.