JP2000094472A - Sheet wind-off supply device for injection molding in- mold decorating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet wind-off supply device contrived so that rolls can be replaced efficiently and rapidly without stopping the operation of a molding device and thereby the productivity is enhanced and at the same time, labor-saving or the like is achieved. SOLUTION: A plurality of rolling means 21, 22 on which sheet rolls which are taken up in the form of a roll and consist of long striplike in-mold decorating sheets, are loaded in a freely rotating manner, are arranged in series in the in-mold decorating sheet wind-off direction. The tip part of the in-mold decorating sheet to be wound off from another rolling means is jointed to the rear end part of the in-mold decorating sheet wound off from one of the rolling means 21, 22 for a switchover operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative laminated product (product) in which a painted sheet on which a pattern, a character or the like is applied in a mold at the same time as injection molding is integrally adhered and laminated on the surface of an injection resin molded product.
The present invention relates to a sheet unwinding and feeding device used in an injection molding simultaneous painting apparatus which obtains the following.

[0002]

2. Description of the Related Art Several methods have been proposed for simultaneous injection molding and painting methods in which a painting sheet is integrally adhered to the surface of an injection resin molded article simultaneously with injection molding.
Most of them are arranged so that all or some of the following steps (a) to (i) are performed in the stated order or permuted, and the steps are sequentially performed or a plurality of steps are simultaneously performed in parallel or in parallel. (Japanese Patent Publication No. 50-19132, Jitsuhei 3
-56344, JP-B-7-41637, etc.).

(A) A sheet supply step of supplying a picture sheet onto a female parting surface used for injection molding. (B) a clamping step of fixing and holding the painted sheet on the female parting surface; (C) A heating softening step of heating and softening the painted sheet with a hot platen or the like. (D) A stretching step (preliminary molding step) of stretching the painted sheet along the female cavity by vacuum suction and / or air supply. (E) A mold clamping step of moving one of the female mold and the male mold (usually a female mold) to the other (usually a male mold) to perform mold clamping. (F) An injection molding step of injecting and filling a resin (molten resin) in a flowing state from the male mold side into a cavity formed between the female mold and the male mold to perform injection molding. (G) A mold opening step of separating the female mold and the male mold. (H) A sheet trimming step of separating a portion of the painted sheet to be attached to the injection resin molded body from another portion (excess portion). (I) A take-out step of taking out the laminated product on which the painted sheet is adhesively laminated from both the male and female molds.

[0004] Simultaneously performing a plurality of steps simultaneously means that a plurality of steps are included in one step. For example, in the mold clamping step (e), the painted sheet is divided into a female mold and a male mold. If it is not fixed and held between them, the clamping step (b) is performed simultaneously with the mold clamping step, and the painted sheet is added in the injection molding step (f). If the stretching is performed by the heat and pressure of the injected molten resin, this means that the stretching step (d) is performed simultaneously with the injection molding step.

[0005] As the painting sheet, either a laminated sheet (laminated sheet) or a transfer sheet is used in accordance with the product type. In the case of a laminated sheet, painting is performed as it is by injection molding. That is, all the layers of the sheet are bonded and integrated with the surface of the injection resin molded body to form a decorative layer. On the other hand, when the painting sheet is a transfer sheet, the support sheet of the painting sheet integrated with the surface of the injection resin molded body is peeled off, and only the transfer layer such as the decoration layer remains on the injection resin molding body side. Then, the painting is completed by forming a decorative layer.

[0006]

However, in performing the simultaneous painting by injection molding as described above, a sheet supplying step of supplying a painted sheet to the female parting surface every shot (molding) is essential. In an injection simultaneous painting apparatus that performs simultaneous injection molding painting, usually, a long strip-shaped painting sheet (sheet roll) wound up in a roll shape is sequentially unwound one shot at a time from the front end side, and this unwinding is performed. A sheet unwinding and feeding device is provided which conveys one shot on the leading end side of the painted sheet onto the female parting surface. The sheet unwinding and feeding device can be roughly classified into two types depending on the transport system.

One of them is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-31852.
As can be seen in Japanese Patent Application Publication No. 3 (1993) -3, etc., an unwinding machine (unwinding roll applying means) and a winding machine (winding roll) are provided on the upstream side and the downstream side, respectively, in the conveying direction of the painted sheet in the female mold. And a take-up winding method (roll / roll method) in which the picture-coated sheet is unwound from the unwinding roll hanging means by one shot and wound up by the winding roll hanging means. The other one is provided with a transport chuck and a receiving fixed chuck as seen in, for example, JP-A-6-315950, etc., and is wound by the unwinding roll applying means by the transport chuck. The leading end of the drawn-out painted sheet is held near the upstream end when viewed in the conveying direction of the painted sheet in the female mold, pulled to near the downstream end of the female mold, and conveyed. Is intended to take the cooperation chuck system to grip fixed in the female downstream side tip of the decorative sheet which is conveyed by received by receiving fixed chuck by.

In any case, in the sheet unwinding and feeding apparatus employing the above-described conveying system, in any case, the remaining amount of the sheet roll (painted sheet) loaded in the unwinding roll applying means is smaller than a predetermined amount. When the number is low (or when it is necessary to use a sheet with a different specification such as a pattern from the next shot (so-called pattern change), a new sheet roll is applied to the unwinding roll applying means. The roll to be loaded is changed, and the picture sheet is unwound from the new sheet roll from the next shot.

[0009] However, conventionally, since only one roll applying means is usually provided, the roll exchange is performed by temporarily stopping the operation of the simultaneous injection molding painting apparatus and replacing the sheet by an operator. After performing a troublesome operation of removing the roll from the roll applying means, loading a new sheet roll into the roll applying means, and setting the leading end of the new sheet roll to a sheet supply means such as a sheet feed roll. , The operation of the device was restarted.

[0010] For this reason, it takes a long time to replace the rolls, and at the time of the roll replacement, it is not possible to perform simultaneous painting with injection molding, resulting in poor productivity. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to enable efficient and quick roll change without stopping the operation of the simultaneous injection molding painting apparatus. Accordingly, it is an object of the present invention to provide a sheet unwinding and feeding apparatus for simultaneous painting with injection molding, which can improve productivity and save labor.

[0011]

In order to achieve the above object, a sheet unwinding and feeding apparatus for simultaneous painting with injection molding according to the present invention basically comprises a male and female mold for simultaneous painting with injection molding. It is used to supply painting sheets in between,
A plurality of roll applying means rotatably loaded with a sheet roll composed of a long strip-shaped painting sheet wound in a roll shape are arranged in series along the painting sheet unwinding direction, and the plurality of rolls are provided. After the painted sheet unwound from one of the hanging means, the painted sheet is continuously interposed between the male and female forming dies so as to replace the painted sheet unwound from the other roll hanging means. It is characterized by being supplied.

[0012] In a preferred aspect of the apparatus of the present invention, the back of the painted sheet unwound from one of the plurality of roll applying means is attached to the rear end of the painted sheet unwound from the other roll applying means. The tips are joined by an appropriate technique. In this case, as a preferred specific example, the front end of the subsequently unwound picture sheet, the leading end of the subsequently unwound picture sheet, a double-sided tape, an adhesive means such as an adhesive, or each other, There is a method of joining using a fusion bonding means for melting and bonding, a mechanical connecting means, and the like.

In another preferred embodiment, a driving means is provided for rotating the sheet rolls loaded on the plurality of roll hanging means independently or in conjunction with each other. In this case, it is preferable that the sheet rolls respectively loaded on the plurality of roll applying means can be driven to rotate in both forward and reverse directions. In other words, tension adjustment (applying back tension or the like) of the painted sheet is performed. Possible driving means are provided, for example a stepping geared motor with a powder clutch.

[0014] In still another preferred embodiment, the plurality of roll applying means are located downstream of the painting sheet unwinding direction.
A picture-sheet-feeding roll such as a nip roll is provided, and a specific portion such as the leading end of the picture-sheet unwound from the state of the sheet roll is temporarily interposed between the sheet-feeding roll and the roll applying means. Sheet fixing means for temporarily fixing is provided. In this case, preferably,
A single sheet feed roll is used in common for the painted sheets unwound from the plurality of roll applying means, and the sheet fixing means is a specific part of the painted sheet which is evacuated. It is possible to use one that is sucked and held by suction, or one that is mechanically held by a chuck or the like.

In a further preferred aspect, a pair of sheet fixing means is disposed between the sheet feed roll and the plurality of roll applying means so as to be able to sandwich the unwound painting sheet. At least one of the sheet fixing means can be moved toward and away from the other by advance / retreat driving means such as an air cylinder. In another preferred aspect, sheet cutting means for cutting the unwound picture sheet in the width direction is provided between the plurality of roll applying means and the sheet feed roll.

As the sheet cutting means, in addition to a cutter (a cutting blade made of metal or ceramic), a heating wire made of a heating wire such as a nichrome wire, an ultrasonic cutter, or a shear for cutting a sheet by a shearing force. Tools and the like. In still another preferred aspect, a sheet remaining amount detecting means for detecting that the remaining amount of the sheet roll loaded in each of the plurality of roll applying means has become a predetermined amount or less is provided in the vicinity of the plurality of roll applying means. .

In a preferred embodiment of the sheet unwinding and feeding apparatus according to the present invention having the above-described structure, a plurality of roll applying means (unwinding machines) are provided in series along the unwinding direction of the painted sheet. When performing simultaneous painting by injection molding, first, a sheet roll (first sheet roll) loaded in one of the plurality of roll hanging means (first roll hanging means) is connected to a motor or the like. By rotating the sheet feeding roll including a nip roll and the like in the forward direction by the driving means,
Is intermittently unwound one shot at a time.
The unrolled first painted sheet is, in a preferred embodiment,
It is supplied through a first guide roll, a first sheet cutting means, a first sheet fixing device, and a common sheet feed roll between the male and female forming dies provided in the simultaneous injection-molding and painting apparatus. Through such a clamping process, a heating softening process, a stretching process (preliminary molding process), an injection molding process, and the like, the product is adhered and laminated on the surface of the injection resin molded product to form a product.

Then, the sheet remaining amount detecting means:
When it is detected that the remaining amount of the first sheet roll unwound earlier is less than a predetermined amount (or, from the next shot, a sheet with a different specification such as a pattern is used (so-called pattern change). )) When necessary)
The leading end of the painted sheet unwound from the second sheet roll previously loaded in the second roll applying means is bonded to the painted sheet unwound from the first sheet roll with a double-sided tape or the like. The splicing is performed so that the painting sheet is continuously supplied between the male and female molds.

More specifically, in a preferred embodiment of the apparatus of the present invention, the leading end of a painted sheet (second painted sheet) unwound from a second sheet roll used after the first sheet roll is used. For example, a double-sided tape as a joining means is previously adhered to the upper surface of the portion, and in this state, the front end portion (the lower surface side) is fixed by, for example, sucking and holding the second sheet fixing means. deep. When changing from the first sheet roll to the second sheet roll, for example, the second sheet fixing means is raised, and the leading end of the second painted sheet fixed to the second sheet fixing means is fixed to the second sheet fixing means. (To which a double-sided tape or the like is stuck) is pressed against a portion directly below the first sheet fixing means in the first painted sheet unwound from the first sheet roll. Adhesive bonding is performed via a double-sided tape or the like so as to sandwich the first sheet fixing means and the second sheet fixing means.

Thereafter, the first sheet roll is cut by a first sheet cutting means on a portion of the first sheet roll upstream of an adhesively bonded portion with a second sheet roll, and the driving means is used to cut the first sheet roll. And rewinding the portion of the first painted sheet upstream of the cutting position by the first sheet cutting means, and appropriately taking the first sheet roll into the first sheet roll at an appropriate time.
And a new sheet roll is loaded in the first roll applying means, and the roll is exchanged.

After the adhesive bonding, the first and second sheet fixing means are released from the suction holding state of the first and second painted sheets by the first and second sheet fixing means, and the sheet fixing means and the like are returned to their original positions. The second sheet roll loaded in the second roll hooking means is rotated in the forward direction by a driving means such as a motor, and the common sheet feeding roll is rotated to intermittently rotate the painted sheet by one shot. Unwind. In a preferred embodiment, the unrolled painted sheet is simultaneously subjected to injection molding at the same time as described above via the second guide roll, the second sheet cutting means, the second sheet fixing device, and the common sheet feed roll. It is supplied between the male and female molds provided in the painting apparatus. Conversely, in the case where the second sheet roll loaded in the second roll hanging means is replaced with a new first sheet roll loaded in the first roll hanging means, basically, a change is also performed. This is performed in substantially the same manner as described above.

As described above, in the apparatus of the present invention, a plurality of roll applying means (unwinding machines) into which sheet rolls are loaded are provided in series along the unwinding direction of the painted sheet, and are unwound first. When the remaining amount of the sheet roll becomes smaller than a predetermined amount, the leading end of the sheet roll to be unwound later is bonded to a previously unwound sheet roll with a double-sided tape or the like so that the sheet roll is replaced. The sheet can be continuously supplied between the male and female forming dies without any interruption, eliminating the need to stop the operation of the apparatus at the time of the roll change, as well as the roll change and the sheet change. The replacement can be performed efficiently and promptly, and as a result, productivity can be improved and labor saving can be achieved.

In the present invention, the male and female molds are made of a metal such as iron or ceramics or the like, and are provided with small holes (vacuum suction holes or the like) for vacuum suction or compressed air supply as required. Further, the female mold is constituted by an aggregate of a plurality of divided portions (in a so-called nested structure), a slit-like gap is formed between adjacent divided portions, and vacuum suction is performed using this gap as a vacuum suction hole. It may be.

The male mold is provided with a runner for injecting the resin in a flowing state and a required gate. The number, position, shape and the like of the gates can be freely set in consideration of the shape and the like of the product to be obtained. Further, a clamping means is additionally provided to press and fix the painting sheet on the female parting surface. The clamping means may be provided on either the female type or the male type. As the clamping means, a rectangular frame-shaped or girder-shaped holding plate or the like can be used, and the driving thereof is performed by, for example, a projecting driving means such as a hydraulic cylinder attached to a male mold.

The painted sheet is composed of a base sheet and a decorative layer laminated thereon, and is a laminated sheet (laminated sheet) used as a final product while keeping the base sheet in close contact with the molded product, or Once the painted sheet and the molded article are integrated, any of the transfer sheets that peel off the base sheet (support sheet) while leaving only the decorative layer (transfer layer) on the injection resin molded article (molded article) side Although the apparatus of the present invention can be used, the unwinding and rewinding method (roll / roll method) is particularly difficult to be employed as the painting sheet supply means, and more advantages are obtained when the painting sheet is a laminated laminated sheet. can get.

In the case of the laminated sheet, a thermoplastic resin such as polyolefin resin such as polyethylene and polypropylene, polyvinyl chloride, acrylic resin, polystyrene, ABS resin, polycarbonate resin and polyester resin is used as the base sheet. Can be. The thickness of the base sheet is usually about 20 to 500 μm. As the decorative layer, a printed pattern, colored or transparent coating, a metal thin film, or a functional layer such as a hard coating film, an antifogging paint, or a conductive layer can be used.

In the case of the transfer sheet, it is for transferring a transfer layer, such as a picture layer, once formed on a releasable support sheet, to another transfer target. The transfer layer may be composed of a release layer, a decorative layer, an adhesive layer, and the like, and layers other than the decorative layer may be selected as necessary. The decorative layer is selected from a pattern layer, a metal thin film layer (part or entire surface) or a functional layer such as a hard coating film, an anti-fog coating film, or a conductive layer.

The support sheet is made of nylon 6, nylon 6
A flexible thermoplastic resin film such as a polyamide resin such as No. 6 or the like, a polyolefin resin such as polyethylene or polypropylene, polyvinyl chloride or the like, or a laminate thereof is preferable. The resin for injection molding is a liquid or fluid state obtained by heating and melting a thermoplastic resin such as ABS (acrylonitrile-butadiene-styrene copolymer) resin, polystyrene, polyvinyl chloride, acrylic resin, polycarbonate resin, etc. Or, a two-part curing type, a catalyst-curing type resin, for example, a material conventionally known for painting simultaneously with injection molding such as an uncured liquid such as a urethane resin or a polyester resin can be used, and the required physical properties and It is selected according to cost etc.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are a side view and a plan view showing an embodiment of a sheet unwinding and feeding apparatus for simultaneous painting with injection molding according to the present invention. The sheet unwinding and feeding device 10 of the illustrated embodiment is disposed above the male and female molds provided in the simultaneous injection molding and painting device, and supplies a painted sheet between the male and female molds. ing. The sheet unwinding / supplying device 10 includes a first sheet unwinding mechanism 11 and a second sheet positioned below the first sheet unwinding mechanism 11 on a machine base 2 that is horizontally arranged. The unwinding mechanism 12 is arranged in series along the unwinding direction (here, the horizontal direction) of the picture-sheet.

The first sheet unwinding mechanism 11 includes a long strip-shaped picture sheet S wound around a core tube 33 in a roll shape.
, A first roll hook 21 of a reel type on which a first sheet roll SR1 made of a roll 1 is rotatably mounted, a first motor 31 attached to the roll hook 21, and the first roll hook First picture sheet S unwound from 21
1, a pair of upper and lower first guide rollers 41, a sheet fixing tool 51 for sucking and holding a front end portion or a rear end portion of the painted sheet S <b> 1, and A first sheet cutting tool 61 for cutting a portion between the guide roller 41 and the first sheet fixing tool 51;
A common guide roll 70 disposed downstream of the sheet fixing tool 51, and a common sheet feed roll 8 including a nip roll disposed downstream of the guide roll 70.
0, and a first sheet remaining amount disposed diagonally above and to the left of the first roll hooking means 21 to detect that the remaining amount of the first sheet roll SR1 loaded therein has become less than or equal to a predetermined amount. A detector 91 is provided.

On the other hand, the second sheet unwinding mechanism 12
The core tube 3 is similar to the first sheet unwinding mechanism 11.
A second reel hook 22 of a reel type, on which a second sheet roll SR2 made of a long strip-shaped second painted sheet S2 wound in a roll shape is rotatably mounted. A second motor 32 attached to the second roller 22; a pair of upper and lower second guide rollers 42 for guiding the second painted sheet S2 unwound from the second roll hook 22; A sheet fixing tool 52 for sucking and holding the leading end of the painted sheet S2, and a second section for cutting a portion between the second guide roller 42 and the second sheet fixing tool 52 in the unwound picture sheet S2. Sheet cutting tool 62, a common guide roll 70 disposed downstream of the sheet fixing tool 52, a common sheet feed roll 80 including a nip roll disposed downstream of the guide roll 70, and Disposed in the upper left of the rolling means 22, the second sheet roll SR loaded thereto
2 is provided with a second sheet remaining amount detector 92 for detecting that the remaining amount of the second sheet is less than a predetermined amount.

The first and second motors 31, 32 are
It is a stepping geared motor with a powder clutch that can adjust the tension of the painted sheets S1 and S2 (such as applying back tension), and can rotate the loaded sheet rolls SR1 and SR2 in both forward and reverse directions. ing. The first and second sheet fixing members 51 and 52 are configured to suck and hold the front end portion or the rear end portion of the painting sheet S by vacuum suction. As exemplified in FIGS. 1 and 3,
It is in the form of a sealed rectangular container, and the second sheet fixing member 52 is provided on the upper surface side thereof (in addition to the first sheet fixing member 5).
1 is not shown, but a number of vacuum suction holes 53 are formed in the lower surface thereof, and an external vacuum source (this vacuum source is common to that used when performing the above-described stretching step). Is suctioned through the conduit 56, thereby painting the painted sheets S1, S2 as described later.
The front end portion or the rear end portion 2 is held by suction.

The second seat fixing member 52 has a pair of left and right air cylinders 55, 5
5, the sheet S1 can be moved back and forth in the direction of approaching / separating from the first sheet fixing tool 51, in this state, while holding the leading end of the sheet S1 by suction. Note that the first sheet fixing member 51 is immovable at a predetermined position. A double-sided tape T is attached in advance to the upper surface of the front end portion of the picture sheet S2 unwound from the second roll hook 22.

On the other hand, the first and second sheet remaining amount detectors 91 and 92 include a support base 93 disposed along the axial direction of the sheet rolls SR1 and SR2,
A swing arm 94 pivotally attached to one end surface of the third arm 3;
A roller 95 rotatably attached to the tip of the swing arm 94 and a proximity sensor 96 attached to one end of the support base 93 so as to be in contact with the base end of the swing arm 93. And the first and second
As the remaining amount of the sheet rolls SR1 and SR2 decreases, the roller 94 placed on the sheet rolls SR1 and SR2 descends and the swing arm 93
Swings clockwise in FIG. 1, and when the remaining amount becomes less than a predetermined amount, as shown in FIGS. 4 and 6,
The base end of the swing arm 93 is close to the proximity sensor 96 and emits a signal indicating that the remaining amount is equal to or less than a predetermined amount to the control unit.

A limit switch or the like may be used instead of the proximity sensor. The first and second sheet cutting tools 61 and 62 are constituted by a cutter (a cutting blade made of metal or ceramic) or a heating wire made of a heating wire such as a nichrome wire. The first sheet cutting tool 61 descends from above the first painted sheet S1 to cut the sheet S1 in the width direction, and the second sheet cutting tool 62 rises from below the second painted sheet S2. Thus, the sheet S2 is cut in the width direction.

In the sheet unwinding and feeding apparatus 10 of the present embodiment having the above-described configuration, the first and second roll hooks (unwinding machines) 21 and 22 are arranged along the unwinding direction of the picture-sheet. When the simultaneous painting by injection molding is performed, first, one of them, for example, the first sheet roll SR1 loaded in the first roll hook 21 is corrected by the first motor 31. And a common sheet feed roll 80 composed of nip rolls.
Is rotated to intermittently unwind the first painted sheet S1 by one shot. The unwound picture sheet S1 is
In a preferred embodiment, the injection molding simultaneous painting apparatus is provided via a first guide roll 41, a first sheet cutting tool 61, a first sheet fixing tool 51, and a common guide roll 70 and a sheet feed roll 80. It is supplied between the male and female molds, passes through the clamping process, the heating softening process, the stretching process (preliminary molding process), the injection molding process, etc. as described above, and is adhered and laminated on the surface of the injection resin molded product to form a product. .

Then, as shown in FIG.
The first sheet unwinded by the sheet remaining amount detector 91 of FIG.
When it is detected that the remaining amount of the sheet roll SR1 has become smaller than a predetermined amount (or when it is necessary to use a sheet with a different specification such as a pattern from the next shot (so-called pattern replacement)) ) Includes a first painted sheet S1 unwound from the first roll hook 21.
The second roll hooking device 22 has the second
Second painted sheet S2 unwound from the sheet roll
The front end is bonded and bonded with a double-sided tape T, so that a painted sheet is continuously supplied between the male and female molds.

This will be described in more detail. The joining means is provided in advance on the upper surface of the leading end of the second painted sheet S2 unwound from the second sheet roll SR2 used subsequent to the first sheet roll SR1. A double-sided tape T is adhered, and in this state, the front end portion (the lower surface side) is suction-held and fixed by the second sheet fixing tool 52 (see FIG. 1). Then, the first sheet roll SR1
When changing to the second sheet roll SR2 from
As shown in FIG. 4, the air cylinders 55 and 55 are simultaneously extended to raise the second sheet fixture 52, and the leading end of the second painted sheet S2 fixed thereto (double-sided tape T Is pressed onto a portion of the first painted sheet S1 that has been unwound from the first sheet roll SR1 directly below the first sheet fixing tool 51. The first sheet fixing tool 51 and the second sheet fixing tool 52 are bonded to each other via a double-sided tape T so as to be pressed.

Thereafter, the first sheet roll SR1
And cutting the first sheet cutting tool 61 by lowering the first sheet cutting tool 61 at the upstream side of the adhesive bonding portion with the second sheet-roll SR2, and rotating the first sheet roll SR1 by the motor 31 in reverse. The first painted sheet S1 is rewound upstream of a portion cut by the first sheet cutting tool 61, and the first sheet roll SR1 is appropriately changed to the first roll after an appropriate time. A new sheet roll is loaded into the first roll hooking tool 21 after detaching from the hooking tool 21, and the roll is changed.

After the adhesive bonding, as shown in FIG. 5, the first and second painted sheets S1 and S2 are released from the suction holding state by the first and second sheet fixing tools 51 and 52. Then, the first sheet fixing device 52 is returned to the original position, the second sheet roll S2 loaded in the second roll hooking device 22 is rotated in the forward direction by the motor 32, and the common sheet feeding is performed. The second painting sheet S2 is intermittently unwound by one shot by rotating the roll 80. The unwound second pictorial sheet S2 is the second
Male and female provided in the injection molding simultaneous painting apparatus in the same manner as described above via the guide roll 42, the second sheet cutting tool 62, the second sheet fixing tool 52, the common guide roll 70 and the sheet feed roll 80. It is supplied between both molds.

On the other hand, conversely, the second sheet roll SR2 loaded on the second roll hook 22 is joined to a new first sheet roll SR2 loaded on the first roll hook 21. In the case of performing the replacement, as shown in FIG. 6, similarly to the above, the leading end of the first painted sheet S1 unwound from the first sheet roll SR1 used subsequent to the second sheet roll SR2, as described above. On the lower surface of the part,
A double-sided tape T as a joining means is adhered, and in this state, the front end (on the upper surface side) of the second sheet fixing tool 51 is
And is fixed by suction. When the second sheet roll SR2 is replaced with the first sheet roll SR1, the air cylinders 55 and 55 are simultaneously extended to raise the second sheet fixing tool 52,
The second sheet fixing member 52 is pressed against the second sheet S2 positioned above the second sheet fixing member S2 to suck and hold the sheet S2, and the second sheet fixing member 52 is further raised until the second sheet fixing member 52 contacts the first sheet fixing member 51. Then, the portion sucked and held by the second sheet fixing tool 52 is pressed against (the double-sided tape T of) the leading end of the first pictorial sheet S1 sucked and held by the first sheet fixing tool 51, They are adhesively bonded via a double-sided tape T so that they are sandwiched between the first sheet fixing tool 51 and the second sheet fixing tool 52.

Before or at the same time as the above-mentioned adhesive bonding, a portion of the second sheet roll SR2 upstream of the adhesive bonding portion with the first sheet-roll SR1 is cut by raising the second sheet cutting tool 62. And the second sheet roll SR by the motor 32.
2 to rewind the portion of the second painted sheet S2 on the upstream side from the cut position by the second sheet cutting tool 62, and appropriately set the second sheet roll in view of an appropriate time. The SR2 is removed from the first roll hook 22 and a new sheet roll is loaded in the second roll hook 22 to perform a roll change.

After the adhesive bonding, as shown in FIG. 7, the first and second painted sheets S1 and S2 are released from the suction holding state by the first and second sheet fixing members 51 and 52. Then, the first sheet fixing tool 52 is returned to the original position, the first sheet roll S1 loaded in the first roll hooking tool 21 is rotated in the forward direction by the motor 31, and the common sheet feed is performed. The first painting sheet S1 is intermittently unwound by one shot by rotating the roll 80.

As described above, in the sheet unwinding and feeding apparatus 10 of the present embodiment, the two roll hooks (unwinding machines) 21 and 22 on which the sheet rolls SR1 and SR2 are loaded are moved in the unwinding direction of the picture sheet. When the remaining amount of the previously unwound sheet roll is smaller than a predetermined amount, for example, when the remaining amount of the previously unwound sheet roll is smaller than the predetermined amount, the sheet to be unwound later is attached to the rear end of the previously unwound sheet roll. The tip of the roll is adhesively bonded with double-sided tape or the like so that it can be replaced.
The painted sheet can be continuously supplied between the male and female forming dies without any interruption. This eliminates the need to stop the operation of the device when changing rolls, as well as efficiently changing rolls and changing sheets. This can be performed quickly, and as a result, productivity can be improved and labor can be saved.

[0045]

As can be understood from the above description, according to the sheet unwinding and feeding apparatus for simultaneous painting with injection molding according to the present invention, the painted sheet is continuously and continuously supplied between the male and female molds. It is not necessary to stop the operation of the apparatus at the time of the roll change unlike the conventional one, and the roll change and the sheet changeover can be efficiently and quickly performed, thereby improving the productivity. And labor saving can be achieved.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a sheet unwinding supply device according to the present invention.

FIG. 2 is a plan view showing an embodiment of a sheet unwinding supply device according to the present invention.

FIG. 3 is a perspective view showing a sheet fixing device of the apparatus shown in FIGS. 1 and 2;

FIG. 4 is a side view for explaining a sheet switching operation from a first unwinding mechanism to a second unwinding mechanism of the apparatus shown in FIG. 1;

FIG. 5 is a side view for explaining a sheet switching operation from a first unwinding mechanism to a second unwinding mechanism of the apparatus shown in FIG. 1;

FIG. 6 is a side view for explaining a sheet switching operation from the second unwinding mechanism to the first unwinding mechanism of the apparatus shown in FIG. 1;

FIG. 7 is a side view for explaining a sheet switching operation from the second unwinding mechanism to the first unwinding mechanism of the apparatus shown in FIG. 1;

[Explanation of symbols]

 S1, S2 Pictorial sheet SR1, SR2 Sheet roll T Double-sided tape 10 Sheet unwinding supply unit 11, 12 Sheet unwinding mechanism 21, 22 Roll hook 31, 32 Motor 41, 42 Guide roll 51, 52 Sheet fixing 61, 62 Sheet cutting tool 80 Sheet feed roll 91, 92 Sheet remaining amount detector

Claims (11)

[Claims] 1. A sheet unwinding and feeding device used for feeding a picture sheet between both male and female molds for simultaneous painting by injection molding, comprising a long strip-shaped picture sheet wound up in a roll shape. A plurality of roll applying means on which a sheet roll is rotatably mounted are arranged in series along the painting sheet unwinding direction, and are unwound first from one of the plurality of roll applying means. The apparatus according to claim 1, wherein the painting sheet is continuously supplied between the male and female forming dies so that the painting sheet unwound from another rolling means is replaced after the painting sheet. . 2. A method in which a leading end of a painted sheet unwound from another roll applying means is attached to a rear end of a painted sheet unwound first from one of the plurality of roll applying means. The apparatus according to claim 1, wherein the bonding is performed by using. 3. A front end portion of the previously unrolled painting sheet is bonded to a rear end portion of the previously unrolled painting sheet by a bonding means such as a double-sided tape or an adhesive, or a fusion bonding of the painting sheets. The apparatus according to claim 2, wherein the joining is performed by using a fusion bonding means, a mechanical connection means, or the like. 4. The apparatus according to claim 1, further comprising driving means for rotating the sheet rolls loaded on the plurality of roll applying means independently or in conjunction with each other. An apparatus according to any one of the above. 5. The apparatus according to claim 4, wherein said plurality of roll applying means are provided with driving means capable of driving the loaded sheet rolls in both forward and reverse directions. 6. A painted sheet feed roll is disposed downstream of the plurality of roll applying means in the painting sheet unwinding direction, and a sheet roll of the sheet roll is provided between the sheet feed roll and the roll applying means. The apparatus according to any one of claims 1 to 5, further comprising sheet fixing means for temporarily fixing a specific portion of the painting sheet unwound from the state. 7. A single sheet feed roll composed of a nip roll is commonly used for a painted sheet unwound from the plurality of roll applying means. An apparatus according to claim 1. 8. The apparatus according to claim 6, wherein the sheet fixing means is configured to suck and hold a specific portion of the painted sheet. 9. A pair of sheet fixing means is disposed between the sheet feed roll and the plurality of roll applying means so as to be able to sandwich the unwound painting sheet.
9. The apparatus according to claim 6, wherein at least one of the pair of sheet fixing means is adapted to be able to approach and separate from the other. 10. A sheet cutting means is provided between the plurality of roll applying means and the sheet feed roll for cutting the unwound painting sheet in a width direction. Apparatus according to any one of claims 6 to 9. 11. A sheet remaining amount detecting means for detecting that the remaining amount of a sheet roll loaded in each of the plurality of roll applying means has become a predetermined amount or less is provided in the vicinity of the plurality of roll applying means. 11. The method according to claim 1, wherein
The sheet unwinding and feeding device according to any one of the above.