JP2010042594A - Transfer foil feeder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transfer foil feeder, capable of solving defective molding of a decorative molded product by maintaining a regular drawn margin of a transfer foil into a mold. <P>SOLUTION: The transfer foil feeder configured to feed the transfer foil wound in a roll shape from a foil supply roll, pass it over a parting surface of the mold, and wind it on a foil wind-up roll includes a foil feed adjustment means which feeds a constant amount of the drawn margin of the transfer foil to be drawn into the cavity of the mold by additionally feeding the transfer foil from the foil supply roll or unwinding the transfer foil wound on the foil wind-up roll by a predetermined amount. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus for a so-called molding simultaneous painting method for imparting a pattern to the surface of a molded article simultaneously with injection molding, and more specifically, a transfer foil feed for supplying a transfer foil on which a pattern is printed into a molding die. It relates to the device.

  The molding simultaneous painting method is such that before the molding resin is filled in the molding die, the pattern of the transfer foil is positioned and clamped in advance in the cavity of the molding die, and then the molten molding resin. The pattern is transferred to the surface of the molded product simultaneously with the molding of the molded product by filling the cavity.

  As a device for supplying a transfer foil for transferring the pattern into a molding die, a transfer foil feeding device is equipped in the molding machine.

  FIG. 7 shows a configuration of a conventional vertical transfer foil feeding apparatus.

  In the figure, a support frame (not shown) is provided above the molding die 50, and a transfer foil roll 51 is supported on the rotating shaft of the support frame.

  The transfer foil 52 unwound from the transfer foil roll 51 passes through a press roller 53 and a clamp device 54 and is supplied between the fixed mold 50a and the movable mold 50b. After the injection molding, the transfer foil take-up roll 55 is supplied. (For example, refer to Patent Document 1).

In the configuration shown in FIG. 7, the tension applied to the transfer foil 52 at the time of injection molding is controlled, and the drawing margin of the transfer foil 52 drawn into the mold is made constant, so that the upper portion of the mold 50 is In the lower part, clamping devices 54 and 56 are provided. In the figure, 57 is a guide roller, and 58 is a potentiometer.
JP-A-4-185410

  However, the clamp devices 54 and 56 wear the clamp portion with time, so that the pressing force changes depending on the operation time, and eventually the tension of the transfer foil 52 cannot be accurately controlled. There is. As a result, the drawing allowance of the transfer foil 52 drawn into the mold during injection molding changes.

  For example, when the clamping device is new, the pressing force is too strong and the burn-in may occur due to the insufficient allowance, and conversely, the clamping part is worn and the pressing force is weak. As a result, the transfer foil may be excessively drawn into the mold, and the surface of the decorative molded product may be wrinkled.

  In addition, the above-mentioned discoloration means a phenomenon in which the color is white and turbid or appears as a crack in the bent part of the molded product reaching the deep groove.

  The present invention has been made in consideration of the problems in the conventional transfer foil feeding apparatus as described above, and it is possible to prevent defective molding of a decorative molded product by keeping the transfer foil drawn into the molding die constant. The present invention provides a transfer foil feeding device that can be eliminated.

The transfer foil feeding device according to the present invention is configured to feed a transfer foil wound in a roll shape from a foil supply roll, pass through a parting surface of a mold, and then wind up on a foil take-up roll. In the foil feeder,
The transfer foil drawn into the mold is fixed by unwinding a predetermined amount of the transfer foil wound around the foil winding roll or by feeding the transfer foil from the foil supply roll. A transfer foil feeding device comprising foil feeding adjusting means for supplying a quantity.

(a) The first form of the transfer foil feeding device according to the present invention is:
A supply-side motor for feeding the transfer foil from the foil supply roll;
The foil feed adjusting means calculates the foil supply roll diameter every time the foil is fed, and controls the rotation speed of the supply motor so that a fixed amount of the pull-in allowance is supplied according to the calculated roll diameter. Is configured to do.

  Moreover, it has a winding side motor for rotating the foil winding roll, and tension is applied to the transfer foil by torque control of the winding side motor.

The foil feed adjusting means is
The foil feed pitch P and the rotation angle θ detected from the supply side motor are known numbers,
From the following equation (1), the foil supply roll diameter R is calculated as an unknown.
P = Rθ (1)

(b) The second form of the transfer foil feeding device according to the present invention is:
A winding side motor for winding the transfer foil;
After the transfer foil is fed into the mold, the foil feed adjusting means rotates the take-up motor slightly in the direction opposite to the feed direction, so that a certain amount of lead-in allowance is transferred to the mold. It is configured to supply.

  Further, in the second embodiment, when having a foil supply motor for controlling the torque of the foil supply roll, and a clamp device for gripping the transfer foil sent from the foil supply roll in the vicinity of the mold The transfer foil contact surface of the clamp can be made of a low friction coefficient member that allows the transfer foil to slip when the transfer foil is retracted.

(C) The third form of the transfer foil feeding device according to the present invention is:
In the second embodiment, a foil supply motor for controlling the torque of the foil supply roll, a clamp device for gripping the transfer foil fed from the foil supply roll in the vicinity of the mold, and a mold film clamp And the foil feed adjusting means is configured to release the fixing of the transfer foil by the clamp device when the transfer foil is retracted, in addition to supplying a certain amount of the withdrawal allowance. Is the gist.

  In each of the above inventions, the drawing allowance can be determined in advance by at least one of the arrangement and shape of the cavity of the mold.

  According to the transfer foil feeding device of the present invention, since the allowance for drawing the transfer foil into the molding die can be made constant, molding defects such as burns and wrinkles that have occurred on the surface of the decorative molded product are eliminated. It has the advantage of being eliminated.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

  First, the transfer foil used in the transfer foil feeding device of the present invention will be described.

  The transfer foil is basically a laminate of a release layer, a pattern layer, and an adhesive layer on a base sheet. After the pattern layer is bonded to the molding resin via the adhesive layer, the base sheet is opened when the mold is opened. Alternatively, it is peeled off from the interface with the release layer after the mold is opened.

  As the material of the base sheet, it is preferable to use PET (polyethylene terephthalate) excellent in heat resistance, but is not limited thereto, polycarbonate resin, polyamide resin, polyimide resin, polyester resin, acrylic resin, olefin resin, urethane A single layer film selected from a resin, an acrylonitrile butadiene styrene resin, a vinyl chloride resin, or the like, or a laminated film or a copolymer film of two or more resins selected from the above can be used.

  Although the thickness of the base sheet can be 5 to 500 μm, it is preferably 25 to 75 μm in view of good handling properties, and 38 to 50 μm in view of good molding stability. Are preferably used.

  The release layer of the transfer foil is a layer located on the outermost side when the substrate sheet is peeled after transferring the design, and functions as a protective layer for the design. Materials for this release layer include acrylic resins, nitrified cotton resins, polyurethane resins, chlorinated rubber resins, vinyl chloride-vinyl acetate copolymer resins, polyamide resins, polyester resins, epoxy resins, and polycarbonate resins. Examples thereof include resins, olefin resins, acrylonitrile butadiene styrene resins, and the like.

  When hardness is required for the release layer, an ionizing radiation curable resin such as an ultraviolet curable resin can be used. The ionizing radiation curable resin may be used alone or in combination with other resins. Note that the thickness of the release layer is preferably 0.5 to 50 μm.

  The pattern layer forms characters, symbols, patterns, coating patterns, etc., and a resin binder and a pigment (or dye) are mixed, and the resin binder and a concealing metal pigment or inorganic pigment are added. It can be mixed and printed by known gravure printing.

  The method for forming the pattern layer on the release layer is not limited to the above gravure printing, and for example, offset printing can be applied.

  In addition, the pattern layer is not limited to the combination of the resin binder and the pigment as described above, but a metal film such as aluminum, chromium, copper, nickel, indium, tin, or silicon oxide by a method such as vacuum deposition or plating. It can also consist of layers. In addition, it is preferable to set the film thickness of the pattern layer in the range of 0.5 μm to 50 μm in order to obtain a sufficient design, and in the case of the above-described metal film layer, 50 μm to 1200 μm is preferable.

  The adhesive layer is for adhering the pattern layer to the surface of the molded product, and a heat-sensitive or pressure-sensitive resin that is compatible with the molding resin material is used.

  For example, acrylic resins, nitrified cotton resins, polyurethane resins, chlorinated rubber resins, polyamide resins, polyester resins, epoxy resins, polycarbonate resins, olefin resins, acrylonitrile butadiene styrene resins may be used. it can. The adhesive layer preferably has a thickness of 0.5 to 50 μm.

  Next, the structure of the shaping | molding apparatus with which the transfer foil feeding apparatus of this invention is applied is demonstrated.

(a) First Embodiment of Transfer Foil Feeding Device FIG. 1 (a) shows a side view of a molding device, and FIG. 1 (b) shows a front view thereof.

  In both figures, the molding apparatus 1 is mainly composed of a foil supply device 2 and a foil winding device 3 as a transfer foil feeding device, and a molding machine 4.

  The foil supply device 2 is configured to intermittently supply the transfer foil 5 to the molding die 4a of the molding machine 4, winding the long strip-shaped transfer foil 5 around the foil supply roll 2a, and a guide roller The transfer foil 5 is unwound from the tip side through 2b and 2c.

  The transfer foil 5 is unwound by a certain length from the foil supply roll 2a and descends in the direction of arrow C, and is taken up by the foil take-up roll 3a of the foil take-up device 3. A constant tension acts by torque control of the lower motor 13 of the foil winding device 3.

  The pattern formed intermittently on the transfer foil 5 is guided to the cavity 4 b of the molding machine 4.

  In addition, in the figure, 4c has shown the core by the side of the movable mold arrange | positioned in the state facing the cavity 4b. Moreover, 3a in the said foil winding apparatus 3 is a foil winding roll, 3b-3d has each shown the guide roller.

  FIG. 2 shows a part of the transfer foil 5 from the front. A plurality of patterns 5 a and a plurality of feed direction marks 5 b are formed in the longitudinal direction at regular intervals, and a width direction mark 5 c is formed on the transfer foil 5. It is linearly formed along the longitudinal direction.

  Each feed direction mark 5b is detected by a first sensor 6 (see FIG. 1B) disposed on the movement path of the transfer foil 5, and the width direction mark 5c is detected by the second sensor 7 and the third sensor. It is detected by the sensor 8.

  Specifically, when the transfer foil 5 is fed at a high speed in the direction of arrow C and detected by the first sensor 6, the transfer foil 5 is switched to a low speed near the center of the feed direction mark 5b, and the transfer foil 5 is moved (lowered) by a predetermined distance. After that, it comes to stop.

  Further, the width direction mark 5c is detected by the second sensor 7 and the third sensor 8, and the shift in the width direction of the transfer foil 5 is adjusted. The displacement in the width direction is performed by sliding either one or both of the upper frame 9 and the lower frame 10 in the direction of arrow D (see FIG. 1B). That is, the inclination of the transfer foil 5 can be adjusted by arranging the two sensors 7 and 8 in the vertical direction.

  Next, the operation of the transfer foil feeder will be described with reference to FIG.

  FIG. 3A is a schematic view of the transfer foil feeding device. The same components as those in FIG. 1A are denoted by the same reference numerals, and description thereof is omitted. FIG. 3B is an explanatory diagram showing marks printed on the transfer foil. In order to simplify the description, it is assumed that one cavity 4b is formed in the mold 4a.

  In FIG. 3B, the feed pitch P [mm] of the transfer foil 5 is measured and input to a touch panel (not shown) of the control unit (foil feed adjusting means) of the transfer foil feeding device.

  The upper servo motor (supply motor) 12 connected to the rotating shaft of the foil supply roll 2a includes a digital encoder, and counts pulses output from the digital encoder per unit time. The number of rotations can be detected, whereby the control unit can determine the rotation angle θ that the foil supply roll 2a has rotated by calculation.

  In detecting the rotational speed of the upper servo motor 12, not only the digital encoder but also a magnetic encoder, an optical encoder, or the like can be used.

  Further, the molding apparatus 1 originally has a control unit that sets various parameters for foil feeding, for example, feeding length, feeding speed, etc. according to the molded product, and executes foil feeding according to the set parameters. Therefore, as the foil feed adjusting means, the control unit calculates the diameter of the foil supply roll 2a every time the foil is fed, and according to the calculated roll diameter, the feed amount of the transfer foil 5 supplied to the molding machine 4 ( The foil feed control of the present invention can be executed by adding a function of making the conventional mold feed amount + the feed amount of the drawing amount at the time of injection molding constant.

  Note that the shape of the cavity of the mold 4a, more specifically, the drawing allowance S (foil drawing allowance that does not generate burns) required by the deep groove shape provided in the cavity is obtained by conducting a test in advance. Make a decision.

  At the time of each foil feeding in molding, first, the transfer foil 5 is supplied to the molding die 4a at a high speed by detecting the feeding direction mark 5b.

The control unit sets the measured foil feed pitch P and the rotation angle θ obtained by the digital encoder as a known number,
The unknown R is obtained from the following equation (1).
P = Rθ (1)
Where R is the mounting radius of the foil supply roll 2a

  Thereby, the mounting radius (foil supply roll diameter) of the foil supply roll 2a which decreases for every foil feed is obtained.

  Subsequently, the rotation angle of the upper servo motor 12 is controlled to feed the pitch so that the above-described pulling allowance S is obtained, and the foil supply roll 2a is slightly rotated in the unwinding direction (direction in which the tension of the transfer foil 5 is relaxed). Let

In this case, the pull-in allowance S and the obtained mounting radius R are known numbers,
The rotation angle θ is obtained from the following equation (2).
S = Rθ (2)

  The upper servo motor 12 is slightly rotated by the determined rotation angle θ.

  However, the upper servo motor 12 has the capability of controlling the feeding of the transfer foil 5 regardless of the diameter of the foil supply roll 2a even when the mounting radius R is maximum, that is, when the transfer foil 5 is wound to the maximum. The one is selected. Thereby, in the molding apparatus 1 of this embodiment, the clamping apparatus which fixes the transfer foil 5 completely is not provided.

  In this way, by controlling the upper servo motor 12 based on the mounting radius R that changes every time the foil is fed, the transfer foil 5 is fed from the foil supply roll 2a, so that the allowance to be drawn into the cavity 4b is always maintained. This makes it possible to eliminate the burn that has occurred in the bent part A of the molded product.

  Since the lower motor (winding motor) 13 controls the torque of the foil winding roll 3a, when the transfer foil 5 is fed forward, a predetermined tension can be applied to the transfer foil 5. it can.

  Thus, in the transfer foil feeding device of the present invention, as described above, the mounting radius R is calculated for each foil feeding without using the clamping device, and the molding machine 4 is used in accordance with the calculated mounting radius R. Since the feed amount of the transfer foil 5 supplied to the mold (conventional die feed amount + feed amount for the drawing amount at the time of injection molding) is made constant, molding is performed by eliminating burns occurring on the surface of the decorative molded product. Defects can be reliably prevented.

(b) Second Embodiment of Transfer Foil Feeding Device FIG. 4 shows the configuration of a molding device 20 equipped with another transfer foil feeding device.

  The transfer foil feeding device shown in the figure can eliminate wrinkles of the decorative molded product due to wear of the foil clamp or weak torque of the drive motor that rotates the foil supply roll when used for a long time. It is configured to be able to. In FIG. 4, the same components as those in FIG. 3A are denoted by the same reference numerals, and the description thereof is omitted.

  The configuration on the foil supply side mainly includes a foil supply roll 2a, a powder brake for rotating the foil supply roll 2a, a guide roller 2b, and a clamp device 22 for gripping the transfer foil 5.

  In the clamp 22 device, the clamp portion 22a and the roller 22b are arranged to face each other with the transfer foil 5 interposed therebetween, and the clamp is applied to the transfer foil 5 by pressing the clamp portion 22a against the peripheral surface of the roller 22b. It has become. However, a member having a low coefficient of friction, specifically, a Teflon (registered trademark) tape 22c is attached to the transfer foil contact surface in the clamp portion 22a.

  Therefore, when clamping the transfer foil 5, the clamping device 22 of this embodiment does not completely fix the transfer foil 5 as in the conventional foil clamp, but holds the transfer foil 5 to the extent that it is pressed. It is designed to be fixed.

  In this way, the transfer foil 5 is pressed down to stabilize the position of the transfer foil 5, and when a tensile force larger than the pressing force is applied to the transfer foil 5, the transfer foil 5 slides on the Teflon tape 22c. It is supposed to be.

  The foil supply roll 2a is provided with a potentiometer 21, and the number of rotations of the foil supply roll 2a is detected at a constant cycle. The powder brake that rotates the foil supply roll 2a is torque-controlled so that the tension of the transfer foil 5 becomes constant based on the detected number of rotations.

  According to the clamp device 22, wear in the clamp portion can be suppressed as compared with the conventional clamp device. Therefore, it is necessary to prevent slipping by using a motor having a large torque for rotating the foil supply roll 2 a. Absent. Moreover, if the mounting radius of the foil supply roll 2a is calculated by the potentiometer 21 and the torque control of the powder brake is performed based on the calculated mounting radius, the transfer foil 5 can be controlled to a predetermined tension.

  On the other hand, the configuration of the foil winding side includes a foil winding roll 3 a, a lower drive motor 24, and a clamping device 23. Is transferred into the mold, and the transfer foil 5 can be held in a certain amount by the pressing operation of the clamping devices 22 and 23 described above. The foil take-up roll 3 a is interlocked with the lower drive motor 24.

  The clamp device 23 has the same configuration as the clamp device 22 and includes a clamp portion 23a, a Teflon tape 23c, and a roller 23b.

  Next, operation | movement of the shaping | molding apparatus 20 which has the said structure is demonstrated.

  In addition, the drawing-in margin of the transfer foil 5 required to follow the shape of the cavity 4b is assumed to be obtained in advance by a test.

  When the drive motor 24 is driven at a predetermined rotational speed, the foil winding roll 3a rotates and the transfer foil 5 is fed in the direction of arrow C.

  When the transfer of the transfer foil 5 to the mold 4a is completed, the transfer foil 5 is held by the clamping devices 22 and 23.

  Next, the lower drive motor 24 is slightly reversely rotated to secure the allowance by being pulled in by a command from the control unit as the foil feed adjusting means, and feeds the transfer foil 5 in the direction of arrow E.

  When suction is performed from the mold side in this state, the force for sucking the transfer foil 5 is stronger than the pressing force by the clamp devices 22 and 23. Therefore, the Teflon tape 22c of the clamp device 22 and the Teflon of the clamp device 23 are used. The transfer foil 5 slips on the tape 23c, and the transfer foil 5 is drawn into the cavity 4b.

  In this way, on the foil winding side, the lower drive motor 24 whose roller diameter of the drive shaft is constant is reversed to feed the transfer foil 5 for the drawn-in amount required during the injection molding to the mold. Since a constant torque is always applied to the transfer foil 5 by the powder brake on the supply side, even in the molding apparatus 20 equipped with the other transfer foil feeding device, the allowance for drawing the transfer foil into the cavity 4b is always constant. Wrinkles generated on the surface of the decorative molded product due to wear of the clamp portion can be eliminated.

  In the above-described embodiment, the Teflon tape is attached to the clamping devices 22 and 23. However, the present invention is not limited to this. A layer consisting of can also be formed.

  FIG. 5 shows a modified example of the clamping devices 22 and 23.

  In the following drawings, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted.

Since the clamp devices 25 and 26 shown in FIG. 5 have the same configuration, the configuration of the clamp device 25 will be described as a representative.
The clamp device 25 includes a press roller 25a and a support roller 25b, and is configured such that the press roller 25a itself rotates when the transfer foil 5 is fed. The transfer foil 5 can be fed.

  Also in this case, as compared with the conventional clamping device, it is possible to suppress wear in the clamping portion, and therefore it is not necessary to prevent slipping by using a drive motor having a large torque for rotating the foil supply roll 2a.

  Further, if the mounting radius of the foil supply roll 2a is calculated by the potentiometer 21 and the torque control of the powder brake is performed based on the calculated mounting radius, the lower drive motor 24 is rotated in the reverse direction so that the transfer foil 5 is removed. Even if the transfer foil 5 is loosened, the transfer foil 5 can be controlled to be at a predetermined tension again.

(c) Third Embodiment of Transfer Foil Feeding Device FIG. 6 shows the configuration of a molding device 20 equipped with still another transfer foil feeding device.

  In the drawing, the configuration on the foil supply side is the same as in FIG. 4, the foil supply roll 2 a, the powder brake that rotates the foil supply roll 2 a, the guide roller 2 b, and the clamping device for gripping the transfer foil 5. 22 mainly.

  In the clamp 22 device, the clamp portion 22d and the roller 22b are arranged to face each other with the transfer foil 5 interposed therebetween, and the clamp portion 22d is pressed against or separated from the peripheral surface of the roller 22b. 5 is fixed or released.

  The powder brake that rotates the foil supply roll 2a is torque-controlled, and the tension of the transfer foil 5 is constant.

  On the other hand, the configuration of the foil winding side includes a foil winding roll 3 a, a lower drive motor 24, and a clamping device 23. Is transferred into the mold, and the transfer foil 5 can be held in the mold by a predetermined amount by the pressing operation by the clamp unit 23d of the clamp device 22 and the clamp device 23 described above. The foil take-up roll 3 a is interlocked with the lower drive motor 24. Moreover, you may stick a Teflon tape on the pressing surface of the said clamp parts 22d and 23d.

  Next, operation | movement of the shaping | molding apparatus 20 which has the said structure is demonstrated.

  The lower drive motor 24 is driven at a predetermined number of rotations, and the foil winding roll 3a is rotated to feed the transfer foil 5 in the direction of arrow C.

  When the transfer of the transfer foil 5 to the mold 4a is completed, the transfer foil 5 is held by the clamping devices 22 and 23.

  On the other hand, the lower drive motor 24 is slightly reversely rotated to ensure a margin for being pulled in by a command from the control unit as the foil feed adjusting means, and feeds the transfer foil 5 in the direction of arrow E.

  In order to place the transfer foil 5 along the cavity 4b of the mold 4a, a clamp device 22 that has fixed the transfer foil 5 in the middle of pressing the transfer foil 5 against the mold 4a with a mold film clamp device (not shown) and 23 is released. This fixation release is performed by the foil feed adjusting means.

  Thereby, the transfer foil 5 is drawn into the cavity 4b of the mold 4a without applying an excessive tensile force.

  Moreover, since the clamping devices 22 and 23 are separated from the transfer foil 5 when the transfer foil 5 is retracted, the braking force of the clamping devices 22 and 23 hardly changes over time.

  Also in the molding apparatus 20 provided with the transfer foil feeding device of the third form, the allowance for drawing the transfer foil into the cavity 4b can always be made constant, and is generated due to wear of the clamping devices 22 and 23. The wrinkles on the surface of the decorative molded product can be eliminated.

(a) is a side view of a molding apparatus equipped with the transfer foil feeding device of the present invention, and (b) is a front view thereof. It is a principal part front view of the transfer foil supplied from a transfer foil feeder. (a) is a schematic diagram of the main part of the apparatus for explaining the foil feeding operation of the present invention, and (b) is an explanatory diagram of marks printed on the transfer foil. It is an apparatus principal part schematic diagram which shows the 2nd form of the transfer foil feeding apparatus which concerns on this invention. FIG. 5 is a view corresponding to FIG. 4 showing a modification of the foil clamp of the present invention. It is an apparatus principal part schematic diagram which shows the 3rd form of the transfer foil feeding apparatus which concerns on this invention. It is a side view which shows the structure of the conventional transfer foil feeding apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding apparatus 2 Foil supply apparatus 2a Foil supply roll 2b, 2c Guide roller 3 Foil winding apparatus 3a Foil winding roll 3b-3d Guide roller 4 Molding machine 4a Mold 4b Cavity 4c Core 5 Transfer foil 5a Picture 5b Feeding direction mark 5c Width direction mark 6 First sensor 7 Second sensor 8 Third sensor 9 Upper frame 10 Lower frame 12 Upper servo motor (supply motor)
13 Lower motor (winding motor)

Claims (8)

In the transfer foil feeding device configured to wind up the foil take-up roll after the transfer foil wound in a roll shape is sent out from the foil supply roll and passed through the parting surface of the mold.
The transfer foil that is drawn into the mold is fixed by unwinding a predetermined amount of the transfer foil wound around the foil take-up roll by unwinding the transfer foil from the foil supply roll. A transfer foil feeding device comprising foil feeding adjusting means for supplying a quantity. A supply-side motor for feeding the transfer foil from the foil supply roll;
The foil feed adjusting means calculates the foil supply roll diameter every time the foil is fed, and controls the rotation speed of the supply side motor so that a fixed amount of the pull-in allowance is supplied according to the calculated roll diameter. The transfer foil feeding apparatus according to claim 1, wherein the transfer foil feeding apparatus is configured to do so.   3. The transfer foil feeding device according to claim 1, further comprising a winding side motor for rotating the foil winding roll, wherein tension is applied to the transfer foil by torque control of the winding side motor. The foil feed adjusting means is
The foil feed pitch P and the rotation angle θ detected from the supply side motor are known numbers,
The transfer foil feeding apparatus according to claim 2 or 3, wherein the foil supply roll diameter R is calculated as an unknown from the following equation (1).
P = Rθ (1) A winding side motor for winding the transfer foil;
After the transfer foil is fed into the mold, the foil feed adjusting means rotates the take-up motor slightly in the direction opposite to the feed direction, so that a certain amount of lead-in allowance is transferred to the mold. The transfer foil feeding device according to claim 1, wherein the transfer foil feeding device is configured to supply. A foil supply motor for controlling the torque of the foil supply roll;
A clamping device that grips the transfer foil fed from the foil supply roll in the vicinity of the mold, and the transfer foil contact surface in the clamping device allows the transfer foil to slip when the transfer foil is retracted. The transfer foil feeding device according to claim 5, wherein the transfer foil feeding device is constituted by a member having a low friction coefficient. A foil supply motor for controlling the torque of the foil supply roll;
A clamp device for gripping the transfer foil fed from the foil supply roll in the vicinity of the mold, and a mold film clamp device;
6. The transfer foil feeding device according to claim 5, wherein the foil feeding adjusting means is further configured to release the fixing of the transfer foil by the clamp device when the transfer foil is drawn.   The transfer foil feeding device according to any one of claims 1 to 7, wherein the drawing margin is determined in advance by at least one of an arrangement and a shape of a cavity of the mold.