KR960003331B1 - Transfer printing method and apparatus - Google Patents

Abstract

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Description

[Name of invention]

Transfer method and device

[Brief Description of Drawings]

1 is an explanatory diagram of a transfer method according to the present invention.

FIG. 2 is an explanatory diagram showing a transfer state from position (I) to position (IV) in FIG. 1 when the transfer member is moved.

3 is a schematic front view of a transfer apparatus according to the present invention.

4 is a plan view of the holder and the chain.

5 is a longitudinal side cross-sectional view of a portion of the thermal roller.

6 is a front view of the transfer portion of the heat roller, a part of which is omitted.

7 is a front view of the position adjusting mechanism of the printed layer, a part of which is omitted.

8 and 9 are cross-sectional views of the pressing roll portion and the pitch adjusting roll portion, respectively.

10 is a side view of the pressing roll shaft arm and the pitch adjusting roll shaft arm portion.

Detailed description of the invention

[Technical Field]

The present invention relates to a transfer method and apparatus therefor for transferring a printing layer on a surface of a synthetic resin film by heating and pressing a container drum in which the drum is cylindrical, in particular a drum of a thin wall container.

In this type of conventional transfer method, the transfer paper sheet is supplied between the heat roller and the cylindrical container with the transfer layer on the surface toward the container, the transfer paper is pressed together with the container, and the heat roller is rotated to transfer the film to the transfer film. Rotate the container against.

In this transfer method, many containers cannot be processed or worked in succession with a single row roller, and transfer slip occurs when the speed is increased to improve the work force.

In addition, since the heater is used as a heating source, when the working time is long, the temperature of the heat roller rises, and when the base of the transfer paper is a synthetic resin film, elongation or melting, which causes a transfer slip, occurs due to overheating.

When adjusting the temperature to prevent overheating, the temperature of the roller surface is significantly lowered, resulting in incomplete printing of the printed layer after transfer, which causes a problem such that the printed layer transferred to the container is peeled off even with small friction. In order to continuously obtain a good print product, another improvement is needed.

In accordance with the above-mentioned situation, the present inventors have repeatedly studied the conventional method and apparatus, and accordingly, the above problems are caused by unstable heating temperature, rotation of the heat roller, and imbalance of the transfer speed of the transfer paper, and many kinds of It has been found that, if controlled by means, it is possible to continuously press a number of containers against a single roller to transfer the drum without partial or total transfer slip.

[Overview of invention]

It is an object of the present invention to uniformly distribute the temperature on the roller surface, to facilitate temperature control by an electrical method, and to perform transfer at high speed and reliability by means of a thermal roller irrespective of the rapid change of the temperature difference before and after control. It is to provide a new method and apparatus.

It is another object of the present invention to provide a new transfer method and apparatus which use a transfer film using a synthetic resin film as a base and can adjust the position between the container supplied to the heat roller and the printing layer of the transfer film for each container. .

Another object of the present invention is a novel transfer method and apparatus having a pressure control means which is very effective for aluminum containers and plastic containers, in particular plastic cans produced by injection stretch blow molding, in which the drum is cylindrical and has the same open end as the drum. To provide.

The present invention which can achieve the above object is characterized by using an induction heating roller based on the heating principle of low frequency induction heating as a heat roller.

The heat roller has an induction coil combined with a magnetic flux generating mechanism composed of a coil and a core, and the roller itself generates main heat by electromagnetic induction generated by applying a voltage, and uses a self-heating heater. Unlike the system, there is no heat loss and accurate high temperature control.

In the case of a heat roller provided with a jacket for sealing the heating medium inside the outer circumferential surface of the roller, more uniform surface temperature distribution characteristics can be maintained at all times.

In the present invention, a plurality of containers together with the transfer film are pressed against the surface of the heat roller, the rotation of the heat roller is transmitted to the container through the transfer film so that the container rotates on the surface of the transfer film to print on the surface of the transfer film. The layer is transferred to the drum of the container.

The container is loosely fitted in the movable cylindrical holder, and the transfer film extends over the pitch adjusting rolls, which are equally spaced on the outer circumference of the heat roller, together with the compression rolls and located in the heat transfer portion.

The holder is rotatably supported at an end of the member movably mounted up and down by a circulation transfer means such as a chain positioned between the pressing rolls, and is pressed from the outside of the transfer film to the pressing rolls by a pressing mechanism located in the heat transfer portion. Pressed against the surface of the roller together with the transfer film.

This pressing causes the transfer film and the drum of the container to be sandwiched between the heat roller and the holder, and the transfer film is pulled by the pitch adjusting roll.

In this state, the transfer film is brought into linear contact with the roller surface with the container by the holder, which is all subjected to local heating and pressure.

This condition as described continues until the holder is separated from the pressing mechanism and moved away from the roller surface, and through local line contact this contact will be in continuous contact by positional movement. The printing layer in the heated and compressed state is transferred from the surface of the transfer film to the container body, compressed by the pressing roller, and completely transferred to the container drum.

Such transfer may be performed in part or in front of the drum, but when the transfer is initiated at a position before or after the transfer start point of the drum, positional shift may occur, resulting in incomplete transfer.

This transfer slip is prevented by the rotation of the pitch adjusting roll. The pitch adjusting roll is formed of an eccentric roll to change the running length of the transfer film in the rotational position. The rotation of the pitch adjustment roll is made based on the detection missing of the mechanism for detecting the position of each printing layer of the transfer film and the mechanism for detecting the position of the transferable member subjected to the transfer operation.

Position detection of each printed layer includes the use of margins between the printed layers and the use of appropriate markings pre-printed on the transfer film. However, if there is a printed layer surface that can be used as an indication, it may be used. The detection means is one capable of removing it with an electrical signal, suitably an opto-electric tube system.

The mechanism for detecting the position of the transcript may also be able to remove it as an electrical signal. The position of the transcript can be detected as the position which finally received thermal transfer.

For example, the position may be obtained by measuring the position of the transfer member after the transfer or by measuring the position of the holding member of the transfer body.

Preferred Embodiments of the Invention

In the drawing, reference numeral 100 denotes an induction heating jacket roller (hereinafter referred to as a heat roller) based on the heating principle of low frequency induction heating. A predetermined number of pressing rolls 102 and pitch adjusting rolls 103 are positioned along the roller surface 101.

The pressing roll and the pitch adjusting roll are mounted at regular intervals by placing the pressing roll 102 therein on a disc 105 which is rotatably installed separately from the rotating shaft 104 located at the center of the heat roller 100. have.

Reference numeral 106 denotes a transfer film whose base is a polyethylene terephthalate stretched film, which is supplied from the left side to the lower portion with the printing surface facing outwards and thereby to the right side of the thermal roller 100, and the lower portion of the thermal roller 100. In contact with the pitch adjustment roll 103 in the. The rotatable cylindrical holder 107 is located outside the transfer film 106.

The holder 107 is movably mounted on a conveying means such as a chain (not shown), and is installed such that the pressing rolls 102 are positioned at regular intervals therebetween.

The container 108, in which the drum is cylindrical and loosely fitted at another position and formed of synthetic resin such as aluminum or polyethylene terephthalate, has a roller surface of the thermal roller 100 with a transfer film 106 extending over the pitch adjusting roll 103. (11) is pressed.

The pitch adjusting roll 103 is movably mounted with respect to the disc 105, and is operated by a signal from a transfer film monitoring system (not shown) on the side of the heat roller 100 into which the transfer film and the container are introduced. Rotate in and out by to correct the positional deviation of the transfer film (106).

The heat roller 100 and the disc 105 and the pressing roll 102 and the pitch adjusting roll 103 rotate counterclockwise, the holder 107 rotates clockwise, and the transfer film 106 moves to the right. Is moved. These rotations and movements are all made at constant speed.

The interval between the pressing roll 102 and the holder 107 is set according to the interval of the printing layer 106a of the transfer film 106, and the transfer of the container 108 to the drum is from the end of the printing layer 106. Controlled to initiate.

The transfer is carried out by the container 108 being supported by the holder 107 and being rotated once with the holder 107 by the heat roller 100, and the pressing roll 102 and the transfer film 106 are moved to the container at the transfer raw material position. Immediately exit from 108.

Therefore, the heating and transfer is carried out by the container 108 supplied with the transfer film 106 is linearly in contact with the roller surface of the heat roller 100 by the holder 107 and rotated once to be separated from the roller surface 101. Until successively.

Even though the heating temperature is high from 150 ° C to 200 ° C by local heating by synchronous line contact between the two, the surface of the container 108 does not overheat or melt, and the printing layer 106a is formed on the drum surface of the container 108. It is transferred continuously and printed so that it does not come off easily.

3 shows an outline of a specific example of the transfer apparatus.

Reference numeral 1 is a carrying-in mechanism for carrying aluminum or plastic can 2, which is a transfer object to be supplied from another process, at a predetermined interval, and reference numeral 3 is a can supplied at a predetermined interval by the carrying-in mechanism 1. It is a guide rail for supplying (2) to the supply mechanism 4 of a heat transfer part.

The supply mechanism 4 of the heat transfer part is transferred to the lower side of the heat roll 5 while supporting the can 2 which is supplied by the loading mechanism 1 and whose contents are not filled. The heat roll 5 transfers the transfer film 6 to the can 2 while heating the transfer film 6.

Reference numeral 7 is a pressing mechanism provided below the heat roll 5 to push the can 2 against the heat roll 5 so as to be in contact with each other. Reference numeral 8 denotes a discharge mechanism for discharging the transferred can 2, and reference numeral 9 denotes a supply mechanism for supplying the transfer film 6 to the transfer portion.

The loading mechanism 1 has a timing belt 11 provided near the lower end of the stair wheel 10 provided below the chute. The timing belt 11 has a partition plate separating the can 2 at predetermined intervals.

On the timing belt, the guide rail 3 protrudes inclinedly toward the traveling direction. Although not shown, the can 2 on the timing belt is moved with the timing belt by the inclined surface and loosely into the plastic cylindrical holder 13 mounted on the chain 12 leading to the supply mechanism 4 of the heat transfer portion. You may be forced to fit.

The supply mechanism 4 is annularly formed by the chain 12 as a pass-over body. The chain 12 passes over the four sprockets 12a and travels with the timing belt 11 at its lower end and at the upper end between the guide rail 20a and the guide plate 21 parallel to the rail 20. Drive on (see Figure 5)

As shown in FIG. 4, a row of the pair of connecting shafts 14 extends laterally at regular intervals through the chain 12, and rollers 15 are rotatably installed on the connecting shafts 14. Outside the chain 12, the bell crank 17 is rotatably installed upward on the shaft portion 16 of the seat body 16a provided on the end of the pair of connecting shafts 14, and the holder 13 is It is provided rotatably on the support shaft 17a outside the end of the bell crank 17.

The guide shaft 18 is installed at the bent portion, and the roller 19 traveling on the rail 20 is installed at the end of the guide shaft 18.

The heating roll 5 is provided with a magnetic flux generating mechanism 51 composed of a coil and a core therein, and although not shown in detail, the jacket 53 has a sealing medium therein, and the roll surface 52 is made of silicon. It is made of rubber. At the end of the rotating shaft which protrudes from the heating roll 5 and is driven by a motor, a disc 23 is provided integrally with the drive chain sprocket 24.

Twelve brackets 27 provided with a pressing roll 25 and a pitch adjusting roll 26 are fixedly mounted at equal intervals on the inner side of the peripheral part of the heating roll 5 side of the original plate 23.

The press roll 25 is rotatably mounted via the mounting member 27 on the press roll shaft 28 rotatably inserted into the bracket 27. The pressing furnace shaft 28 extends through the disc 23 to protrude outward, and the pressing roll shaft arm 30 is fixed to the protruding portion. The pressing arm roller 31 is rotatably installed at the end of the pressing roll shaft arm 30.

The pitch adjusting roll 26 is mounted on the rotatable eccentric shaft 33 which is installed on the adjusting roll shaft 32 rotatably inserted into the bracket 27 and at one end thereof protrudes out of the disc 23. . The adjusting roll shaft arm 34 is fixed to the protruding end of the adjusting roll shaft 32, and the adjusting arm roller 35 is rotatably installed at the end of the adjusting roll shaft arm 34.

The pole 36 is integrally provided at the base end of the pressing roll shaft arm 30, and the other end thereof is always biased by the spring 37 means. The adjusting roll shaft arm 34 is provided with teeth 34a that mesh with the pawls 36.

In the outer surface on the introduction side of the disc 23, a longitudinal cam plate 38 slightly bent inward for the pressing roll is located.

The cam plate 38 provides a connection between the pitch adjusting roll 26 and the pressing roll 25 once through the pressing arm roller which is moved together with the original plate 23, after which the position of the pitch adjusting roll 26 This connection is resumed when the pressing roll 25 is determined to be pressed with the can 2 together with the transfer film 6.

The fixed roller guide 39 and the movable roller guide 40 for the adjustment arm roller 35 are provided between the pressing plate cam plate 38 and the original plate 23 behind the upright plate 54.

The fixed roller guide 40 forms a tapered groove 41 to return the pitch adjusting roller 26 to its correct position when a force is applied to the adjusting arm roller 35. The movable roller guide 40 moves the pitch adjustment roll 26 and adjusts the printing layer position of the transfer film 6. The movable roller guide 40 is connected to the two cylinders 43 via the arm 42, and can be controlled by three intervals of upper, middle, and lower portions.

The four pitches of the twelve pitch adjusting rolls 26 are rotatable, and the other eight are previously fixed by screws at predetermined positions. The cam plate 38, the two guide rollers 39, 40 and the cylinder 43 are mounted on an upright plate 54.

The press mechanism 7 for the can 2 includes a press plate 4 having an upper end bent along the heat roller 5 between the rails 20 as shown in FIGS. 3 and 6, and a press plate ( A plurality of connecting members 45 rotatably connected to 44 and an air cylinder 46 connected to the connecting member 45 with a piston shaft 46a.

The pressing plate 44 always presses the holder 13 against the heat roll 5 by the operation of the air cylinder 46 while transferring in contact with the roller 19 of the bell crank 17, but not transferring. While the holder 13 is moved away from the heat roll 15 as indicated by the dashed-dotted line.

As shown in FIG. 3, the transfer film supply mechanism 9 includes a supply roll 55, a winding roll 56, and an intermediate guide roller 47, and transfer film 6 from the supply roll 55. As shown in FIG. Is passed between the can 2 and the heat roll 5 and between the pressing roll 25 and the pitch adjusting roll 26 and wound and fixed to the take-up roll 56 axis.

A transfer brake for controlling the tensile force of the transfer film 6 is installed on the feed roll 55 shaft to adjust the tensile force of the transfer film 6 supplied to the heat roll 5 to a predetermined size. In the middle, a sensor 48 for detecting the surface of the print layer of the transfer film 6 and sending an operation command to the cylinder 43 is provided.

Reference numeral 49 denotes a drive sprocket mounted on a drive shaft (not shown) for operating the transfer chain 12, and the sprocket integrated with the disc 24 is connected to the heat roller 5 by the chain 50. Rotate in the same direction as

The operation is explained in the following.

First, the transfer film 6 is driven to supply the heat transfer station. At the same time, when the can 2 with the open end facing inward is supplied to the supply chute, the can is transferred by the star wheel 10 onto the timing belt 11 at a predetermined interval.

The can 2 on the timing belt 11 is continuously moved toward the chain 12 by the inclined surface of the guide roll 3 and loosely fitted in the holder 13. The can is also conveyed along the guide rail 20 to the heat roll 5 by the movement of the chain 12.

At this time, since the pressing plate 44 is pushed up by the cylinder 46, when the roller 19 is displaced from the rail 20 to the upper surface of the pressing plate 44, the bell crank 17 is supported by the support shaft ( Upward with respect to 16), the can 2 is pressed by the heat roll 5 between the pressing rolls.

On the other hand, the position of the printed layer of the transfer film 6 is always sensed by the sensor 38. Each sensing on the actuator for the cylinder 43 provides an electrical signal, which, in response to the signal, changes the direction of the movable roller guide 40 at the end of the plunger.

When the pressing roll 25 and the pitch adjusting roll 26 are moved to the introduction side of the heat roll 5 by the original plate 23 rotating at the same speed as the chain 12, the arm roller 31 is first used for the pressing roll. The taper portion 38a on the inner upper side of the cam plate 38 is in contact with and moved along the inside thereof. Thus, the pressing roll shaft 28 rotates with respect to the spring 37, so that the pawl 36 is separated from the teeth 34a of the adjusting roll shaft arm 34 so that the pitch adjusting roll 26 is free.

As the rotation of the disc 23 proceeds further, the adjusting arm roller 35 moves into the tapered groove 41 of the fixed roller guide 39 and is guided by the tapered surface to the center portion of the groove. After that, it is moved into the movable roller guide 40 in a predetermined direction by the operation of the cylinder 43. In the passage of the movable roller guide 40, the angle change of the pitch adjusting roll 26 in contact with the transfer film 6 occurs, so that the transfer film is stretched or loosened so that the position of the printing layer with respect to the can 2 of the holder is fine. Adjust it.

At the position where fine adjustment is completed, the arm roller 31 is wound to the original position by the taper portion 38b on the lower inner side of the cam plate 28 and the spring pressure, and the pawl 36 of the pressing roll shaft arm 34 is rotated. And the teeth 34 of the adjusting roll shaft arm 26 are again engaged with each other so that the pressing roll 25 and the pitch adjusting roll 26 are locked with each other, and at the same time, the pressing roll 25 can open the transfer film 6 (2). Pressurize against).

In this state, when the heat roll 5 is further rotated together with the disc 23, the can 2 is rotated while being pressed against the heat roll 5 and the pressing roll 25 through the transfer film 6. Thus, after that, the transfer to the can 2 is carried out in a manner similar to the process mentioned in FIG.

[Effects of the Invention]

As described above, according to the present invention, by using induction heating as a heating means, the temperature of the heat roller is easily removed, and the transfer film is not melted by heating.

In addition, since the transfer is performed by the compression roll after the container and the transfer film are heated, transfer slip is hardly generated when the transfer is performed on the heat roller, and the transfer operation can be performed at high speed. In addition, the present invention is very useful in the industry because the transfer amount of the transfer film can be finely adjusted by the movement of the pitch adjustment roll to prevent the positional deviation.

The apparatus of the present invention can be widely used.

Claims (9)

Using a thermal roller as an induction heating jacket roller, a predetermined number of pressing rolls and a pitch adjusting roll are mounted at regular intervals coaxially with the thermal roller along the roller surface of the thermal roller, and a transfer film is supplied to the outside of the pitch adjusting roller. Press the cylindrical plastic container together with the holder between the compression rollers, bring the transfer film into line contact with the heat roller together with the drum of the container, and synchronously heat the container and the transfer film at the contact portion, and then press And synchronously heating the transfer film and transferring the printed layer of the transfer film to the drum outer circumferential surface of the container after the roll is rolled. A thermal roller in the form of an induction heating jacket roller, a disc rotatably installed on the axis of rotation of the roller, and a predetermined number of pressing rolls and pitches mounted on the disc while the heat rollers are parallel to each other at regular intervals on the roller surface. An adjustment roll, a transfer film extending over the pitch adjustment roller located in the heat transfer station of the heat roller with the printing surface outward, and a transfer film in the heat transfer station mounted on the circulation conveyance means at a predetermined interval so as to be movable up and down A holder for a transfer member which is continuously transported outward, an apparatus for pressing the holder together with the transfer member of its outer circumference with respect to the surface of the heat roller between the pressing rolls through a transfer film, and a transfer roller positioned on the introduction shaft of the heat roller A fine adjusting device for changing the position of the pitch adjusting roll relative to each position of the printing layer to prevent slipping Four devices. 3. A transfer apparatus according to claim 2, wherein the roller surface of the frying heat roller is formed of silicone rubber. 3. The transfer apparatus according to claim 2, wherein the pressing roll and the pitch adjusting roll are provided on a rotating shaft mounted parallel to the bracket inside the disc, and the axis of the pitch adjusting roll is composed of an eccentric shaft. 5. The pressurized arm roll according to claim 2 or 4, wherein one end of the press roll shaft and the adjusting roll shaft protrudes outwardly through the disc, and has a press arm roll provided at one end so as to be pivotably installed. The pressing roll shaft arm is provided at the protruding end of the pressing roll shaft, and the adjusting roll shaft arm is provided at the lower end thereof with the adjusting arm roll and the pawl provided at the proximal end thereof, and the pressing roll shaft arm is formed on the side of the disc. Transfer device, characterized in that biased in the direction of improved engagement by means of a spring installed in the. 6. The transfer device according to claim 5, wherein the transfer device comprises a press roll cam plate located in a disc plane on the introduction side of the heat roller, a fixed roller guide and a movable roller guide vertically installed on an upright plate between the press roll cam plates. A roller guide is connected to a flange of a cylinder operated by a signal from a printing layer detection device for a transfer film, engagement and separation between the pawls and teeth are made by a connection between the press arm roller and the cam plate, and a transfer member And fine adjustment of the position of the printed layer relative to the adjustment arm roller and the fixed roller guide and the movable roller guide. The heat roller according to claim 2, wherein the holder is rotatably installed at one end of the bell crank rotatably mounted up and down on the circulating conveying means and simultaneously on the bent portion of the bell crank and on the pressing plate. And a roller running on a rail formed parallel to the edge. The transfer apparatus according to claim 2 or 7, wherein the holder is formed of a synthetic resin. The transfer apparatus according to claim 2, wherein the transfer film is formed from an extension film.

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