JPS6158318B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical field The present invention relates to a transfer film used for transfer molding. Transfer molding is a method in which a plastic transfer film is inserted between the molds of an injection molding machine, and a pattern previously printed on the transfer film is transferred to the molded product at the same time as molding.

(b) Prior Art There is a conventional transfer film as shown in FIG. Designs 22 are repeatedly printed on the long transfer film 20 at predetermined intervals, and longitudinal marks 30 are provided at the same intervals on the left side of the transfer film 20 in FIG. A continuous width direction mark 32 is provided on the right side. This transfer film 2
0 was used for transfer molding using a transfer molding apparatus as shown in FIGS. 2 and 3. That is, the pattern 22 on the transfer film 20 is transferred between the movable die 14 attached to the movable plate 12 and the fixed die 18 attached to the fixed plate 16. The transfer film 20 is positioned by a film positioning device 24. That is, the film positioning device 24 can feed the transfer film 20 in the longitudinal direction of the film and stop it at a predetermined position, and the film positioning device 24 itself can move in the film width direction and stop it at a predetermined position. A longitudinal direction sensor 26 and a width direction sensor 28 for detecting the longitudinal and widthwise positions of the transfer film 20, respectively, are attached to a stationary part above the outside of the mold. As mentioned above, the pattern 2 is printed on the transfer film 20.
Longitudinal marks 30 arranged at the same pitch as 2
and continuous width direction marks 32 are printed. To position the transfer film 20 in the longitudinal direction, the longitudinal direction sensor 26 detects the longitudinal direction mark 30.
This is done by stopping the feeding of the transfer film 20 when the transfer film 20 is detected, and the width direction positioning of the transfer film 20 is performed by the width direction sensor 28.
This is done by horizontally moving the film positioning device 24 to a position where the width direction mark 32 is detected.

However, in such a conventional transfer film, the longitudinal direction mark 30 is arranged on the side away from the longitudinal center line, so when the transfer film 20 is tilted, the longitudinal direction sensor 26
Even if the longitudinal direction mark 30 is at a predetermined position at the position shown in FIG. I couldn't do it. In order to improve the positioning accuracy, a longitudinal mark may be provided in the center of the transfer film, but in this case it is necessary to distinguish between the pattern and the mark. Also,
In the conventional transfer film 20, only one longitudinal mark 30 is provided, so in order to improve positioning accuracy as much as possible, it is necessary to slow down the film feeding speed, resulting in poor efficiency.
Also, regarding the width direction mark 32, the width direction sensor 2 is placed at a position away from the mold center position.
8, the positioning in the width direction could not be performed precisely either. Further, if there is a printing error between the pattern 22 on the transfer film 20 and the marks 30 and 32, the error is amplified.

(C) Object of the Invention The object of the present invention is to obtain a transfer film that can accurately position a pattern at a transfer position even when the transfer film is tilted.

(d) Structure of the Invention The present invention achieves the above object by arranging longitudinal marks, width marks, and speed switching longitudinal marks at predetermined positions on a transfer film. That is, in the transfer film according to the present invention, longitudinal marks are provided on the longitudinal center line of the transfer film or at positions close to this line at the same intervals as the predetermined intervals between the patterns,
Longitudinal marks for speed switching are arranged at predetermined intervals on the sides of the transfer film in the width direction. A mark is provided.

(E) Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 4 to 9 of the accompanying drawings.

FIG. 4 shows a transfer film 58 according to the present invention. On the long transfer film 58, a pair of designs 86a and 86b that are simultaneously transferred are repeatedly printed at predetermined intervals. A longitudinal mark 82 is provided at the transfer center position of the transfer film 58 (a position on the film center line and intermediate between the patterns 86a and 86b, which corresponds to the mold center position during transfer). The spacing between each longitudinal mark 82 is equal to the pitch between each pattern 86a and 86b. On the left side of the transfer film 58 as seen in FIG. 4, there is a longitudinal direction mark 80 for speed switching.
is provided, and a width direction mark 84 is provided on the right side. The longitudinal direction mark 80 for speed switching and the width direction mark 84 are the longitudinal direction mark 8
It is arranged at the same pitch as 2. The width direction mark 84 is arranged on a width direction line passing through the transfer center position, and has a predetermined length in the longitudinal direction of the film.

5 to 7 show a transfer molding apparatus that performs transfer molding using a transfer film 58. Fixed plate 4
A fixed mold 44 and a movable mold 46 are attached to the movable platen 0 and the movable platen 42, respectively. When the fixed mold 44 and the movable mold 46 are closed, they are guided by the guide pin 48 and the bush 50 and come into close contact with each other.
This mold includes the convex portion 44a of the fixed mold 44 and the movable mold 4.
It has two molding parts (transfer positions) formed by six recesses 46a. A film positioning device 52 is provided on the movable platen 42. The film positioning device 52 includes guide rolls 54 and 5.
The transfer film 58 guided by the transfer film 6 can be stopped at a predetermined position by a longitudinal drive device (not shown). Further, the film positioning device 52 can be moved in the horizontal direction by a widthwise driving device (not shown). The transfer film 58 has guides 60a and 6 for preventing flapping.
0b, and guides 62a and 62b at the upper and lower parts of the movable mold 46. Further, the transfer film 58 is also guided by a guide 63 provided at the center of the movable mold 46. A speed switching longitudinal direction sensor 64 is provided in the stationary part above the mold. A longitudinal sensor 66 is provided in a recess 46b in the center of the movable mold 46. Further, a width direction sensor 68 is provided at a position on a horizontal line passing through the center position of the movable die 46. Longitudinal direction sensor 66 and width direction sensor 6
8 is provided in the movable mold 46 in an enlarged manner in FIG. The longitudinal sensor 66 is fixed in the recess 46b of the movable mold 46 by a support 70. The longitudinal direction sensor 66 is an optical switch and has a light emitting section 66a and a light receiving section 66b arranged parallel to the film width direction. The light emitting section 66a and the light receiving section 66b are connected to an amplifier (not shown) outside the movable mold 46 by glass fiber wires 72a and 72b, respectively. The width direction sensor 68 is attached within the recess 46c of the movable mold 46 by a support 74. The width direction sensor 68 is an optical switch similar to the longitudinal direction sensor 66, and includes a light emitting section 69a and a light receiving section 68.
b, but the light emitting part 68a and the light receiving part 68
b is arranged parallel to the longitudinal direction of the film.
The light emitting section 68a and the light receiving section 68b are connected to an amplifier by glass fiber wires 76a and 76b, respectively. Note that the aforementioned guide 63 is supported by a support 78 fixed to the movable mold 46. Note that, as shown in FIG. 5, when the movable mold 46 is in close contact with the fixed mold 44, the guide 6
A recess 44b is provided for receiving 3.

Next, a transfer molding operation using the transfer film 58 will be explained. First, transfer film 58
is fed at high speed in the longitudinal direction (Y direction shown in FIG. 6) by a longitudinal drive device (not shown).
The longitudinal direction sensor 64 for speed switching is connected to the longitudinal direction mark 80 for speed switching on the left side of the transfer film 58.
When this is detected, the feeding speed of the transfer film 58 is switched from high speed to low speed. At this time, the pattern 86b has passed the longitudinal direction sensor 66. Since the longitudinal direction sensor 66 is configured to be able to detect the mark at the same time as the speed is switched to low speed, the longitudinal direction sensor 66 detects the mark 86.
b will not be mistaken as the longitudinal direction mark 82. After switching to low speed, the transfer film 5
8 is fed by a predetermined amount, the transfer film 58
The longitudinal direction mark 82 located at the transfer center position reaches the position of the longitudinal direction sensor 66 . When the longitudinal mark 82 is detected by the longitudinal sensor 66, the longitudinal drive is stopped and the longitudinal positioning of the film is completed. Next, positioning in the film width direction is performed. That is, the transfer film 58 is moved in the film width direction (X direction shown in FIG. 6) while being supported by the guide rolls 54 and 56 by a width direction drive device (not shown). When the width direction mark 84 provided on the right side of the transfer film 58 in FIG. 6 is detected by the width direction sensor 68, the width direction driving device is stopped and the positioning of the film in the width direction is completed.

Next, the improvement in positioning accuracy due to the use of the transfer film 58 according to the present invention will be explained with reference to FIG. 8 in comparison with a conventional example. Assuming that point G is the transfer center position, conventionally, a mark has been detected at a point a that is distant from point G by _Y1 in the longitudinal direction of the film and _X1 in the width direction of the film. In this case, if the transfer film 58 is tilted by an angle α, an error ΔY corresponding to the distance between points b and c occurs on the longitudinal center line of the film. That is, △Y=X ₁ ×tan
becomes α. In addition, in the film width direction, there are points h and i.
This produces an error ΔX corresponding to the distance between the points. That is, ΔX=Y ₁ ×tanα. However, according to the present invention, the longitudinal direction sensor 66 is located on the center line of the transfer film 58, and the longitudinal direction sensor 66 is located on the center line of the transfer film 58.
The value of X ₁ is 0. Therefore, the transfer film 5
Even if there is an inclination in the film 8, the error in the longitudinal direction of the film can be made almost zero. Further, the width direction sensor 68 is arranged on a line parallel to the film width direction passing through the transfer center position G (for example, point e), and the dimension corresponding to _Y1 is 0. Therefore, even if the transfer film 58 is tilted, the width direction error ΔX can be made almost zero. As a result, by using the transfer film 58 according to the present invention, the film can be positioned extremely accurately in both the longitudinal and width directions.

Furthermore, even if there is a printing error in the positions of the patterns 86a and 86b printed on the transfer film 58, the positions of the marks 82 and 84 may be changed to the pattern 86a and 86b.
Since it is close to a and 86b, errors during transfer can be made smaller than in the conventional case.

In addition, in the embodiment described, the longitudinal direction mark 8
2 is provided at the transfer center position, but even if it is not at the transfer center position, it is possible to obtain similarly high positional accuracy if it is located on a longitudinal line passing through the transfer center position or close to this line. Therefore, even if there is a molded article at the transfer center position, the present invention can be applied to a transfer film 58' of another embodiment shown in FIG. Furthermore, even if the width direction mark 84 is not exactly on the width direction line passing through the transfer center position, the positional accuracy can be improved if it is located close to this line.

(f) Effects of the Invention As explained above, according to the present invention, in a long transfer film on which one or more designs are repeatedly printed at predetermined intervals to be transferred to a molded product at the same time as injection molding, transfer is possible. Longitudinal marks are provided on the longitudinal center line of the transfer film or at positions close to this line at the same intervals as the predetermined intervals between the patterns, and longitudinal marks for speed switching are provided on the widthwise side of the transfer film. The marks are arranged at predetermined intervals, and the width direction marks are provided on the width direction line passing through the transfer center position of the transfer film or at a position close to this line, so that the transfer film is not tilted. High positioning accuracy can be obtained even when printing errors occur. Furthermore, since the feed rate can be changed, efficiency can be improved and positioning accuracy can also be improved.
The present invention also applies when there is a design at the transfer center position.
It can also be applied to cases where a large number of designs are transfer-molded at the same time.

[Brief explanation of the drawing]

Figure 1 shows a conventional transfer film, Figure 2 shows a conventional transfer film.
The figure shows a transfer molding device using a conventional transfer film, FIG. 3 is a view of the transfer molding device shown in FIG. 5 is a diagram showing a transfer molding apparatus using the transfer film according to the present invention, and FIG. 6 is a diagram showing the transfer molding apparatus shown in FIG.
7 is a sectional view taken along the line - in FIG. 6, FIG. 8 is a diagram showing the principle of positioning error generation, and FIG. 9 is a diagram showing another embodiment of the present invention. It is. 80...Longitudinal mark for speed switching, 82...
Longitudinal mark, 84...Width direction mark, 86
a, 86b...design.

Claims (1)

[Scope of Claims] 1. In a long transfer film on which one or more designs are repeatedly printed at predetermined intervals to be transferred to a molded product at the same time as injection molding, on or along the longitudinal center line of the transfer film Longitudinal marks are provided at the same intervals as the predetermined intervals between the patterns at positions close to the transfer film, and longitudinal marks for speed switching are arranged at predetermined intervals on the sides of the transfer film in the width direction. Further, a transfer film characterized in that a width direction mark is provided on a width direction line passing through the transfer center position of the transfer film or at a position close to this line.