JPS6073849A - Method and apparatus for hot stamping - Google Patents

Abstract

PURPOSE:To enable to perform hot stamping on the tapered clinder face and curved face of a disc product without causing wrinkling by a method in which a heating roller of a shape similar to the curved shape of the periphery of the product is turned and a stamp foil is wound around the product, and number the conditions, the foil is closely contacted with a given stamping face by the heating roller. CONSTITUTION:A disc product 10 is held rotatably around its axial core, and a heating roller 6 similar to the curved shape of the periphery of the product 10 in the bus shape in the contact portion with the product 10 in the face of a given stamping face of the product 10. When a winding roller 27 is lowered toward the direction of arrow P, a stamp foil 28 tensed in a given tension force is rolled on the foil incoming side of the product 10, the roller 24 is also lowered while being pressed at a pin 22 in the direction of arrow Q by the effect of foil tension, and the foil is wound around the periphery of the product 10. Under the condition, the heating roller 6 is lowered in the direction of R while being turned in the direction of G and closely contacted with the product 10, and hot stamping is applied on a given curved face of the periphery.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for hot stamping a curved outer peripheral surface of a circular-shaped product.

Conventional configurations and their problems In recent years, the use of hot stamps has expanded to include not only flat surfaces but also decorative effects on products, such as tapered surfaces, curved surfaces, and cylindrical surfaces. In the conventional hot stamping method, the outer circumferential surface of the product was hot stamped by rotating the product while pressing a hot plate against the surface of the product.

On a tapered surface or a curved surface with an H, it was difficult to completely complete the foil without wrinkles on one surface of the Polar L-stuff. The technical reason for this is that if the surface is tapered or curved, the length of the hot-stamped foil will appear as a difference in diameter of the product shape, and one dimensional difference will appear as wrinkles on the surface. Ta.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned problems of the prior art at once, and aims to provide a method and an apparatus for pot stamping the tapered cylindrical surface and curved surface of a circular machined product without any wrinkles. purpose.

Structure of the Invention The present invention is characterized in that a disc-shaped product is rotatably held on its axis, and the generatrix shape at the contact area with the product faces a predetermined stamp surface of the product. Rotate a heating roller that has the same shape as the curved surface of fti\, and before hot stamping, place the stamp indentation, which is stretched under a predetermined tension between the product and the heating roller, on the clean entry side of the product. A hot stamping method and apparatus for hot stamping a predetermined outer circumferential curved surface by pressurizing and closely adhering the foil to a predetermined stamp surface with a heated roller while the foil is wrapped twice, and hot stamping the predetermined outer circumferential curved surface.

By using a foil tensioning technology that wraps foil around the product before hot stamping, and by using a zero-force heat roller with a shape that is the same as the product's generatrix shape, we are able to create a shape that could not be achieved with existing technologies such as tapered cylindrical surfaces and curved surfaces. Hot stamping on the outer peripheral curved surface can be performed continuously without any appearance defects such as wrinkles.

This makes it possible to hot stamp not only beautiful fins but also complex curved surfaces.

DESCRIPTION OF THE EMBODIMENTS FIGS. 1 and 2 show the entire hot stamping apparatus according to an embodiment of the present invention, and FIGS. 3 and 4 show the main parts of this embodiment.

10 is a disc-shaped product, the outline of which is shown in FIG. Its dimensions are approximately 300mJ in diameter, approximately 10101l1 in thickness, and approximately 2G in chamfer on the tapered surface.

First, the overall configuration of the apparatus of this embodiment fj+ will be explained.

3 is the lower plate, which is the base of this hot stamping device, 2 is the support, and 1 is the upper plate.These three points form the framework. 12 is a product receiver, 11 is a rotating shaft for the product receiver, 9 is a support stand, and 69 is an outer box. When the product 1o is fitted into the product receiver 12, the product 10 is held rotatably. The support stand 9 is fixed to the lower plate 3, and its height relative to one pressurizing direction can be adjusted. 4 is a pressure cylinder, 6 is a pressure base, 6
is a heating roller, 7 is a heater, 8 is a protective cup (-13
o is a bearing box, 31 is a drive main shaft, 32 is a roller drive motor, and a pressure cylinder 4 is attached to the earthen plate 1, and the piston of the pressure cylinder 4 is connected to the cylinder.

The pressure base 6 is fixed, and the pressure base 5. bearing box 30,
The heater 7 and the protective cover 8 form a pressurizing section.

This pressurizing section has a drive main shaft 31 in a bearing box 30, a roller drive motor 32 is attached as a drive source for this, and a heating roller 6 is provided at the tip of the drive main shaft 31 to form a drive section. The axial center of the heating roller 6 and the axial center of the product 10 are substantially in a 1/- line relationship, and moreover, the - is an arrangement relationship that is contained within the same plane. .

In addition, the support 2 in this embodiment is provided with a single winding part 17 and a foil reverse tension part 13 on the left and right sides, respectively, so that the foil can be held in the bottle and under tension in the space between the heating roller 6 and the product 1o. It is haridashi in a state where it is joined.

1 and 4, 46 is the winding main shaft, 46 is the winding motor, 20 is the winding shaft, 21 is the round belt, 18 is the winding roller, 19 is the friction roller, 22 is the pin, 23Fi
Lever 24 is a roller.

These parts form the foil winding section 17. The friction roller 19 has a rubber surface and is in pressure contact with the first take-up roller 18. Now, when the first take-up motor is rotated in the direction of arrow J, the foil enters from under the take-up roller 18 and is pressed against the first take-up roller 18. rotates in the direction of arrow M, and the foil 29 is wound up in the direction of arrow N on the winding shaft 20. In addition, this winding section 17 has a foil guide section that serves as a guide and a guide for holding down one foil until the foil comes into contact with the winding roller 18, and a pin 22 is provided as a rotation fulcrum by its own weight.
A lever 23 is attached to this pin 22.
There is a roller 24 at the tip.

This foil guide part constantly presses the depression in the direction of arrow Q with its own weight around the pin 22.

36 shown in FIGS. 1 and 3 is a reverse tension king shaft.

14 is the foil original fabric - 33 and 34 are the original fabric pressers, 28 is the foil before hot stamping, 38 is the friction plate, 39 is the clutch plate - 4
0 is the clutch, 41 is the pulley.

42 is a compression spring, 36 is a support -37t/'i spring holder.

Reference numeral 16 denotes a reverse pulling/retracting motor, 43 a pulley, 44 a round belt, and 16 a foil guide roller, and these parts form the foil reverse pulling part 13. Reverse tension main shaft 3
6, the original fabric 14 is fixed by the original fabric holders 33 and 34, a friction plate 38 is attached to this main shaft 36, and a clutch 40.6 is connected by a spring 42. Clutch plate 39. Both pulleys 41 are pressed against the friction plate 38, and the rotational torque of the reverse tension main shaft 36 is increased or decreased by adjusting the spring pressure. When the reverse tension motor 16 rotates in the direction of arrow H, the clutch plate 39 rotates in the direction of arrow 1 due to the round bell (44Vc). 36 also tries to rotate in the direction of the arrow. However, the winding direction of the woman is one foil winding section 17.
The upper part of the product 10 is wound in the direction of the arrow,
Since the rotation direction of the reverse tension main shaft 360 is in the direction of the arrow, the foil is constantly pulled in tension both in the L direction and in the direction of the amount of reflection, and at this time, the clutch The contact surface between the plate 39 and the friction 1ii38 may slip. In reality, the winding direction in the L direction is only used when hot stamping.

Tension in the reverse tension direction is applied to the foil from the point between the take-up roller 1 and the friction roller 19, and the foil is pulled in the L direction at the same time as hot stamping starts, and the reverse tension main shaft 36 is also pulled in the direction of the arrow. The foil will come out under certain conditions, with the foil being taut and taut without the raw material coming undone.

26 is a foil wrapping cylinder, 26 is a piston rod of the foil wrapping cylinder, 27 is a wrapping roller, and one foil wrapping cylinder 26 is provided several times on the lower plate 3, and one heating roller 6 and a product 10 are provided. Foil 28 stretched with constant tension in the space between
f: By moving the wrapping roller 27 in the direction of arrow P, the product 1Q is wrapped around the runner entry side, and these parts form the foil wrapping part. The operation of the hot stamping method and its apparatus in Practical Example 1 is shown in Figure 6 (a) below.
), (b>, and (c)), and will be explained according to the order of operation.

In the state before hot stamping in FIG. 6 (2L), the heating roller 6 and the pressure section are on standby above.

Heat from the heater 7 is reflected by the protective cover 8 and applied to the surface of the heating roller 6, and the heating roller 6 is constantly rotating in the direction of arrow G. This heating roller cIt-Table i is made of silicone rubber with a rubber hardness of about 60 to 80, and the optimal surface temperature of the contact part with a product is in the range of about 175 to 216"C. The tensioning part always rotates in the direction of the arrow to give a constant tension to the foil, and the foil wrapping part is waiting at the top, and this foil tension causes the roller 24 to rotate around the pin 22 and the lever 23 and the roller. 24 until it balances with the self 71. The motor of the winding section is stopped. This is the state shown in FIG. 6(a) before hot stamping.

Fig. 5(b) In the foil wrapping state shown in K, the heating roller 6 is still rotating and waiting at the top, the winding section is also stopped, and the reverse tension section of the foil is rotating in the cutting direction. At this time, when the roller 27 descends in the direction of arrow P, the foil 28 is wrapped around the entrance side of the product 10 at a wrapping angle of approximately T0, and due to the effect of the foil tension, The roller 24 also comes down while being pushed in the direction of the arrow Q by using the bottle 22 as a hammer. Even at this time, there are no walnuts in the foil, and the foil ends up wrapping around areas on the outer peripheral surface of the product 1o where hot stamping is not yet completed. The best effect can be obtained if the winding angle T0 is at least 46° or more, but if the winding angle is 90' to 180° or more, the winding angle T0 may be affected by the position of the winding cylinder 26 and the position of the web 14. The angle of entry is not easy, and although an angle of 45° or more is not a problem with hot-stamping soil, the most effective angle is in the range of about 46° to 1200°.

Figure 6(C) shows the state during hot stamping.

The foil winding section, the foil reverse tension section, and the wide wrapping section are in the same state as in FIG. At the same time as the product 10 begins to come into close contact with the product 10 under pressure, the product 1° is held rotatably, so the rotational force of the heating roller 6 is transmitted and the product 1° begins to rotate in the direction of the arrow S. Of course, at this time, the foil begins to be transferred onto the outer peripheral surface of the product 10. As the product 10 is hot-stamped, the streaks 29 after hot-stamping are rolled up by the rotation of the winding unit in the M direction, and the product 10, the heating roller 6, and the foil 28 are pressed into close contact with each other by the lowering of the pressure unit. At the same time as hot stamping starts, the winding motor also starts rotating, so the foil 29 after stamping continues to be wound one round, so the lightweight roller 24. The foil guide part made up of the lever 23 also moves down in the Q direction more and more to the foil 29.
for.

This means that only force in the winding direction is applied.

The circumferential speed of the so-called hot stamping surface on the outer peripheral surface of the product is set to be slightly faster than the foil layer speed of the first winding section due to the pressurized contact between the heating roller 6 and the product 10, thereby forcing the foil itself during hot stamping. This prevents tearing of the foil and slippage between the foil and the product on the stamp surface by stretching, allowing hot stamping to be performed without disturbing the aesthetic appearance.

While hot stamping in this way, the foil 28 is placed on the product 1.
0 While applying strong tension to the so-called foil entry direction side of the outer periphery, which is not hot-stamped, hold it tightly.
To wrap and hot stamp, product 1o
Such tension was also applied to the pressurized contact area between the product 10 and the heating roller 6. Hot stamping was carried out one after another on the outer circumferential surface of the product 10. In the turntable of this embodiment, the outer circumferential surface was a tapered surface. However, since the tension from wrapping was still applied, it was possible to hot stamp with no wrinkles at all.

By the way, when the wrapping cylinder 26 is not used to wrap the thread around the outer periphery of the product 10, even if air is drawn in and the foil is under tension, the foil does not follow any guide material and immediately enters the pressurized contact area. This is largely due to the fact that the outer circumferential surface of the product was used as a guide for the entry of the foil due to the foil wrapping K, which caused wrinkles due to the shuffling.

Furthermore, a plastic turntable with a diameter of about 16 Qmm, a thickness of about 16 mm, and a tapered surface with a chamfer of about 1.60 could be hot-stamped on the outer peripheral tapered surface.

In addition, the shape of the heating roller 6 and the generatrix shape of the product 1o are 1
In this embodiment, it is desired to hot stamp only the tapered surface 47 as shown in FIG.

The heating roller 6 is also formed with a tapered surface 48 having the same inclination angle as the tapered surface 47 of the product 10, so that the product surface and the heating roller surface are accurately brought into close contact, and hot stamping with excellent appearance can be performed because the gaps are hot. It will be done.

Figures 8 and 9 are drawings of the generatrix shapes of the heating roller 60, 64 and the product 49°63 when simultaneously hot-stamping the circular outer circumferential surface, Te, <- surface and the cylindrical outer circumferential surface of other embodiments. Both methods provide hot stamps that are wrinkle-free and have no aesthetic problems.

Note that when the hot stamp completes one rotation around the outer periphery of product 1Q, the foil wrapping section and the pressing section (including the heating roller) rise and the foil winding section also stops rotating. Returning to a), only the heating roller 6 and the foil reverse drawing part continue to rotate. Since a reverse tension force is also applied to the foil, it is re-formed to a constant tension between the wrapping roller 27 and the roller 240 of the R6 guide section, and waits for the next product.

Effects of the Invention As detailed above, the present invention holds a disc-shaped product rotatably around its axis, and forms a generatrix shape at a contact portion with the product, facing a predetermined stamp surface of the product. While rotating a heating roller that has the same shape as the curved surface on the outer periphery of the product, before hot stamping, a stamp foil stretched with a predetermined tension is placed between the product and the heating roller. Wrap the product around the entrance side of the runner, and in the state of wrapping once, press the stamp foil into close contact with the predetermined stamp of the product using the heating roller, and apply a hot stamp to the curved surface of the outer circumference of the foot in one place. By applying this method, it is possible to produce hot stamps with no appearance defects such as wrinkles, and it is possible to realize a hot stamping method and apparatus that can achieve the effect of not only improving the appearance of the product but also enabling hot stamping on complex curved surfaces. It is something.

[Brief explanation of the drawing]

Fig. 1 is an overall view of the hot stamping device in one embodiment 1+lJ of the present invention, Fig. 2 is a cross-sectional view taken along the line A-B of Fig. 1, and Fig. 3 is a cross-sectional view of the main part of the female genital tension part of Fig. 1. 0-D
4 is a sectional view taken along the line E-F of FIG. 1 showing the cross section of the foil winding part, and FIG.
(Cj) is an operation explanatory diagram showing the operations of the above embodiment in order, FIG. 6 is a perspective view of a product to be hot stamped in an embodiment of the present invention, and FIG. 7 is a diagram showing a product in an embodiment of the present invention and its FIGS. 8 and 9 are side views showing the shapes of heating rollers facing each other, and FIGS. 8 and 9 are side views showing a product in another embodiment of the present invention and the shapes of heating rollers facing it. 4...Pressure cylinder, 6...Heating roller, 10...Product-13...Foil reverse eye catching part-17... Foil winding section, 26...Foil winding cylinder, 32...Roller drive motor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 5 Figure 5 (C) Figure 6 0 7

Claims (4)

[Claims] (1) A disk-shaped product is held rotatably around its axis, and a generatrix shape at a contact portion with the product facing a predetermined stamp surface of the product is a curved surface shape at the outer periphery of the product. While rotating a heated roller equal to (1) A stamping method characterized in that the stamp foil is pressurized and brought into close contact with a predetermined stamp surface of the product by the heating roller while the stamp foil is wrapped once, and hot stamping is performed on a predetermined outer circumferential curved surface. (2) A disc-shaped product rotatably held around an axis, and a generatrix shape at the contact area with the product facing a predetermined stamp surface of the product, and a curved surface shape at the outer periphery of the product. identical heating rollers, a drive unit that rotates the heating rollers, a winding unit that winds up the stamp foil stretched at a predetermined tension in the space between the heating roller and the product, and a winding unit that is opposite to the winding direction. (a) a pressure section that presses and brings the stamped surface into close contact with a predetermined stamped surface of the product using the heating roller; 1. A Hola i-stamp device, characterized in that it has a winding part for wrapping the stamp device around the side thereof. (3) The hot stamping device according to claim 2, wherein the winding angle created by the winding portion is 46° or more. (4) A foil guide section is provided in the winding section from the product contacting part to the time when the foil comes into contact with the winding roller, and is swingable and presses the foil only by its own weight. The hot stamping device according to item 2.