JPS606500A - Film for transfer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 design is printed on the transfer film in advance and transferred to the molded product at the same time as the molding.

(b) Prior Art A conventional transfer film is shown in FIG. 1. 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 20 was used for transfer molding using a transfer molding device as shown in FIGS. 2 and 3. In other words, movable plate 1
The pattern 22 on the transfer film 20 is transferred between the movable die 14 attached to the transfer plate 2 and the fixed die 18 attached to the fixed plate 16. The transfer film 20 is positioned by a film positioning device rq24. That is, the film positioning device 24 can move the 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 respectively detecting the longitudinal position and the width direction position of the transfer film 20 are attached to a stationary part above the outside of the mold. On the transfer film 20, as described above, longitudinal marks 30 and continuous width marks 32 arranged at the same pitch as the pattern 22 are printed.

The longitudinal positioning of the transfer film 20 is performed by stopping the feeding of the transfer film 20 when the longitudinal direction sensor 26 detects the longitudinal direction mark 30, and the width direction positioning of the transfer film 20 is performed by stopping the transfer film 20 when the longitudinal direction sensor 26 detects the longitudinal direction mark 30. This is done by horizontally moving the film positioning device 24 to a position where the width direction sensor 28 detects the width direction mark 32.

However, in such a conventional transfer film, since the longitudinal direction mark 30 is arranged on a side far from the longitudinal center line, when the transfer film 20 is tilted, the longitudinal direction mark 30 is placed at the position of the longitudinal direction sensor 26. Even if the longitudinal direction mark 30 is at a predetermined position, the transfer center position of the transfer film 20 and the center position U of the mold do not match, and the transfer film 20 must be accurately positioned in the longitudinal direction. 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. In addition, conventional transfer film 2
0, only one longitudinal mark 30 is provided, so in order to improve the positioning accuracy as much as possible,
It was necessary to slow down the film feed speed, which was inefficient. Furthermore, since the width direction mark 32 is also detected by the width direction sensor 28 located at a position away from the mold center position, it is possible to similarly perform width direction positioning efficiently. could not.

In addition, the pattern 22 and mark 30 on the transfer film 1.20
and 32, if there is a printing error, that error is amplified.

(c) Purpose 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 in positions close to this line at the same intervals as the predetermined intervals between the patterns, and the transfer film Longitudinal marks for speed switching are arranged at predetermined intervals on the widthwise sides of the transfer film, and widthwise marks are placed on the widthwise line passing through the transfer center position of the transfer film or at a position close to this line. It is provided.

(e) Examples Examples of the present invention will now be described with reference to 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. The transfer center position H of the transfer film 58 (
This position is on the film center line and midway between the designs 86a and 86b, and this position corresponds to the mold center position at the time of transfer)
is provided with a longitudinal mark 82. each firstborn.

The distance between the direction marks 82 is the same as each pattern 86a and 86b.
Equal to the pitch of fill. The fourth part of the transfer film 58
A longitudinal mark 80 for speed switching is provided on the left side in the figure, and a width direction mark 84 is provided on the right side. The speed switching longitudinal marks 80 and the width marks 84 are arranged at the same pitch as the longitudinal marks 82. 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 platen 40 and movable platen 4
A fixed mold 44 and a movable mold 46 are attached to each of the molds 2 and 2. 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 has two molding parts (transfer positions) formed by a convex part 44a of the fixed mold 44 and a concave part 46& of the movable mold 46. 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 is movable in the horizontal direction by a width direction drive device (not shown).
a and 60b 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. FIG. 7 shows an enlarged view of the state in which the longitudinal direction sensor 66 and the width direction sensor 68 are provided within the movable mold 46. The longitudinal direction sensor 66 is located in the recess 46b of the movable mold 46.
It is fixed within by a support 7o. The longitudinal direction sensor 66 is an optical switch and has a light emitting part 66a and a light receiving part 66b arranged in 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 lines 72a and 72b, respectively. The width direction sensor 68 is mounted within the recess 46c of the movable mold 46 by a support 74. The width direction sensor 68 is a light switch similar to the longitudinal direction sensor 66, and the light emitting section 8
8a and a light receiving section 68b, the light emitting section 68a and the light receiving section 68b are arranged parallel to the longitudinal direction of the film.

The light emitting section 68a and the light receiving section 68b each have a glass 7 eye per! It is connected to the amplifier by l176a and 76b. Note that the aforementioned guide 63 is supported by a support 78 fixed to the movable mold 46. In addition,
As shown in FIG. 5, the fixed mold 44 has a movable fl! ! 4
A recess 44b is provided for receiving the guide 63 when the guides 6 are brought into close contact.

Next, a transfer molding operation using the transfer film 58 will be explained. First, the transfer film 58 is sent at high speed in the longitudinal direction (Y direction shown in FIG. 6) by a longitudinal direction driving device (not shown).

The longitudinal direction sensor 64 for speed switching is connected to the transfer film 58.
When the speed switching longitudinal direction mark 80 on the left side of the transfer film 58 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. At the same time as the speed is switched to low speed, the longitudinal direction sensor 66 becomes in a state where the mark can be detected. When the transfer film 58 is fed by a predetermined amount after being switched to a low speed, the longitudinal direction mark 82 located at the transfer center position of the transfer film 58 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 C1 transfer film 5 is moved by a width direction drive device (not shown).
8 moves in the film width direction (X direction shown in FIG. 6) while being supported by guide rolls 54 and 56.

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 drive device is stopped and the positioning of the film in the width direction is completed.

Next, the improvement in positioning accuracy by using the transfer film 58 according to the present invention will be explained based on 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 separated from point G by Yl in the longitudinal direction of the film and xl in the width direction of the film. In this case, the transfer film 58
is tilted by an angle α, the error Δ corresponding to the distance between point b and point C on the center line in the longitudinal direction of the film is
Y occurs. That is, Δy=xlxtanα. Further, an error ΔX corresponding to the distance between the h point and the i point is generated in the film width direction. That is, ΔX = Y]
It is X tan α. However, according to the present invention, the longitudinal direction sensor 66 is located on the center line of the transfer film 58, and the value of x1 is zero. Therefore, even if the transfer film 58 is tilted, the error in the longitudinal direction of the film can be kept to approximately 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 0), 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 approximately O. As a result, by using the transfer film 58 according to the present invention, it is possible to position the film extremely accurately in both the longitudinal direction and the width direction.

In addition, the pattern 8 printed on the transfer film 58''
Even if there is a printing error in the positions of 6a and 86b, since the positions of marks 82 and 84 are close to patterns 86a and 86b, the error during transfer can be made smaller than in the conventional case.

In the described embodiment, the longitudinal direction mark 82 is provided at the transfer center position, but even if it is not at the transfer center position, it may be placed at a similarly high position on the longitudinal line passing through the transfer center position or at a position close to this line. Accuracy can be obtained. Therefore,
Even if there is a molded article at the transfer center position, the present invention can be applied as in the 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) As described in detail, 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, 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 sides 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 can be applied even when there is a pattern at the transfer center position or when a large number of patterns are transfer-molded at the same time.

[Brief explanation of the drawing]

Fig. 1 shows a conventional transfer film, Fig. 2 shows a transfer molding device using a conventional transfer film, and Fig. 3 shows the transfer molding device shown in Fig. 2 along the line III-III. 4 is a view showing the transfer film according to the present invention, FIG. 5 is a view showing a transfer molding apparatus using the transfer film according to the present invention, and FIG. 6 is a view showing the transfer film shown in FIG. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6, FIG. 8 is a diagram showing the principle of positioning error generation, and FIG. It is a figure which shows another Example of invention. 80.e.Longitudinal mark for speed switching, 82...Longitudinal mark, 84...Width direction mark, 86a, 86b
**s design. t I, 3, 21 Figure 4 Figure 5 (312□H Figure 8171 Figure 9

Claims (1)

[Scope of Claims] 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 adjacent positions at the same intervals as the predetermined intervals between the patterns, longitudinal marks for speed switching are arranged at predetermined intervals on the widthwise side of the transfer film, 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.