JPH0523301Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for tensioning a transfer foil in the width direction after a pattern has been transferred in a simultaneous forming transfer machine.

(Prior art) Simultaneous molding in which a band-shaped transfer foil with a design provided at a certain pitch is interposed between a fixed mold and a movable mold so that the design is transferred simultaneously with injection molding of a resin molded product. In the transfer machine, either the fixed die or the movable die is provided with a transfer means for transferring the transfer foil by passing between the two, and this transfer means transfers the transfer foil before clamping the mold for each molding operation. It is designed to transfer one pitch at a time. Therefore, unless the transfer foil is stopped in a predetermined positional relationship with respect to the mold, an error will occur in the transfer position of the design onto the molded product. Therefore, this type of simultaneous forming transfer machine is provided with a positioning means in the transfer direction that stops the transfer means when it detects an identification mark provided on the transfer foil for each pitch corresponding to each pattern. It is customary. By the way, when trying to perform accurate positioning using this positioning means,
It is necessary to tension the transfer foil sent out from the mold in the transport direction, but doing so causes the following disadvantages. In other words, in this type of simultaneous molding transfer machine, the design is transferred to the molded product in a high temperature state immediately after solidification with the transfer foil in close contact with it, so the transfer foil is heated after the design has been transferred. Unevenness will occur due to deformation. As tension force in the transfer direction acts on the unevenness, vertical wrinkles occur in the transfer foil, and these vertical wrinkles cause distortion in the next pattern, making it impossible to perform normal transfer.

In addition, in this type of simultaneous molding transfer machine, in order to align the transfer foil to a predetermined position in the width direction perpendicular to the transfer direction, the relative displacement in the width direction of the second identification mark provided on the transfer foil is adjusted. A second positioning means for detecting and positioning is provided, but this second positioning means is usually installed downstream of the transfer mold in the transfer direction. Therefore, due to the occurrence of vertical wrinkles in the transfer foil, the position of the second identification mark is also shifted, making it impossible to accurately align the position in the width direction.

To solve this problem, conventionally, as shown in FIG. The rod 4 and the pedestal 8 are arranged, and the movable mold 1 is attached to the movable pedestal 5 to which the movable mold 1 is fixed, leaving a gap between the horizontal rod 4 and the pedestal 8 that is large enough for the transfer foil 2 to pass through. This was dealt with by passing the transfer foil 2 between them. According to this, the transfer foil 2 passes through a very small gap formed between the pedestal 8 and the horizontal bar 4, so that the vertical wrinkles 6 are stretched out, and the transfer foil Since the pattern 2 is not wrinkled, the pattern 7a to be transferred next time is prevented from being distorted, and positioning in the width direction is also performed with high precision.

(Problem to be solved by the invention) However, in the method of stretching the vertical wrinkles 6 of the transfer foil 2 using the horizontal bar 4 as in the above conventional example, it is necessary to prevent the vertical wrinkles 6 from extending to the pattern 7a before transfer. In order to do this, the pattern 7 after transfer must pass through the horizontal bar 4, so the adjacent patterns 7a and 7 must be provided with a large pitch _p1 , and therefore the pattern 7 must pass through the horizontal bar 4.
A large plain area is required between a and 7',
There was an inconvenience that the transfer foil 2 was wasted.

This invention deals with the above-mentioned situation in simultaneous forming transfer machines, and reduces the blank area between the patterns as much as possible while applying tension to the transfer foil in the transfer direction. To provide an apparatus capable of eliminating vertical wrinkles, positioning a transfer foil in the width direction with high precision, and transferring a pattern without distorting it.

(Means for Solving the Problems) In order to solve the above problems, in the present invention, a belt-shaped transfer foil in which a plurality of designs are arranged in a row in the longitudinal direction is interposed between a fixed mold and a movable mold, and resin molding is performed. In a simultaneous molding transfer machine configured to transfer the design on the transfer foil to the molded product simultaneously with the injection molding of the product,
A pair of clamping means disposed downstream of the fixed mold and the movable mold in the transfer direction of the transfer foil to clamp both sides of the transfer foil, respectively, and a drive for driving the clamping means toward and away from each other. equipped with the means.

(Function) According to the above configuration, the pair of clamping means clamps both side edges of the transfer foil, and in this state, the driving means moves the clamping means in the width direction of the transfer foil, so that the transfer foil is Since vertical wrinkles upstream of the holding means are eliminated due to tension in the direction, positioning in the width direction can be performed with high precision, and distortion of the untransferred design at the transfer position between the fixed mold and the movable mold is prevented. will be done. In that case, for example, even if both edges of the transfer foil are held between the intermediate portion of the pattern after transfer by the holding means, the transfer foil should be held wide enough to prevent vertical wrinkles from extending to the untransferred pattern at the transfer position. Since the foil can be tensioned in the direction, it is possible to use a transfer foil with a smaller pattern pitch.

(Example) Examples of the present invention will be described below.

First, the general structure of the simultaneous molding transfer machine 11 will be explained with reference to FIGS. Type 1
2 and a movable mold 13, as well as a fixed mold 12.
An injection nozzle 14 for molten resin is disposed on the back of the mold 13, and the movable mold 13 is moved in the front-rear direction (left-right direction in FIG. 2) by a driving means (not shown) such as a cylinder.
It is attached to a movable table 15 that is reciprocated and can move toward and away from the fixed mold 12. When the fixed mold 12 and the movable mold 13 come into contact with each other, a cavity of a predetermined shape is formed by the molding surfaces 12a and 13a, and the molten resin injected from the injection nozzle 14 into this cavity is transferred to the fixed mold 12. It is adapted to be supplied and filled through an injection passage 16 provided.

On the other hand, on the movable table 15, there is a band-shaped transfer foil 18 on which a large number of transfer patterns 17...17 are drawn in a row.
A feeding means is provided. This sending means is
It is composed of a transfer foil supply unit 19 provided on the upper part of the movable base 15 and a transfer foil winding unit 20 provided on the lower part of the movable base 15. and,
Between the left and right side frames 21, 21 of the transfer foil supply unit 19, there is a roll support shaft 23 that supports the roll 22 of the untransferred transfer foil 18, and a roll support shaft 23 that supports the roll 22 of the untransferred transfer foil 18.
Transfer foil 18 is placed between a feed roller 24 that pulls out transfer foil 18 from 2 and sends it forward, and this roller 24.
A pressing roller 25 sandwiching the feed roller 24 is pivotally supported, and a first motor 28 for driving the feed roller 24 via a pair of gears 26 and 27 is attached to one side frame 21. Also,
Rack shafts 29, 29 are supported by the side frame 21 so as to be slidable back and forth, and a fixed mold 12, which holds the transfer foil 18, is attached to a connecting member 30 installed on both the rack shafts 29, 29. and a guide roller 3 that guides between the movable mold 13 and
1 is pivoted. The transfer foil supply unit 19 is equipped with a pinion shaft 32 having pinions 32a, 32a that mesh with the rack shafts 29, 29, respectively.By rotating this pinion shaft 32, the guide roller 31 is moved back and forth. The passage position of the transfer foil 18 between the fixed mold 12 and the movable mold 13 can be adjusted back and forth.

On the other hand, the transfer foil winding unit 20
The engaging blocks 34...34 fixed on the movable table 15 are engaged with the rails 35, 35 fixed laterally on the lower surface of the movable base 15, so that they can be slid laterally. , the movable base 1
A second motor 37 for lateral feeding and a screw shaft 39 rotated by the second motor 37 via a belt 38 are supported on the bracket 36 fixed to the screw shaft 36. A female screw member 40 fixed to the substrate 33 is screwed together. Thereby, the entire transfer foil winding unit 20 is slid laterally via the screw shaft 39 in response to the rotation of the second motor 37. Between the left and right side frames 41, 41 of this transfer foil winding unit 20, there is a transferred transfer foil 1.
Roll support shaft 43 that supports No. 8 winding roll 42
, a tensioning roller 44 that tensions the transfer foil 18 in the transfer direction, and a pressing roller 45 that sandwiches the transfer foil 18 between the tensioning roller 44 and the guide in the transfer foil supply unit 19 . Similarly to the roller 31, the pinions 46a, 46a and the rack shaft 4 are rotated by the rotation of the pinion shaft 46.
A guide roller 48 is provided which is moved back and forth via rollers 7 and 47. Also, one side frame 4
1 is connected to the tensioning roller 44 via a belt 49.
A third motor 50 is attached to rotate the transfer foil 18, and this motor 50 constantly pulls the transfer foil 18 in the winding direction via the tension roller 44. The transfer foil 18 is moved between the guide roller 31 and the guide roller 48 in the transfer foil winding unit 20.
is always maintained at a predetermined tension. As shown in FIG. 2, a clamp member 51 is provided on the opposite surface of the fixed mold 12 to the movable mold 13 for fixing the transfer foil 18 when the molds 12 and 13 are brought into contact with each other.
...51 is provided.

Further, on one side of the transfer foil 18, first identification marks 52...52 for positioning in the transfer direction are provided on one side of the transfer foil 18.
In addition, on the other side of the transfer foil 18, a second identification mark 53 for positioning in the width direction is provided in a straight line along the transfer direction. A first position detector 54 is attached to the connecting member 30 of the transfer foil supply unit 19 in correspondence with the passing position of the first identification marks 52...52, and a second identification mark is attached to the lower part of the movable base 15. A second position detector 55 is attached corresponding to the position where the mark 53 passes.

In the transfer foil winding unit 20 located below the movable base 15 to which the second position detector 55 is attached, a pair of left and right air cylinders 56, 56 constituting the width direction tensioning device in this embodiment is installed. They are distributed on both sides of the transfer foil 18. In addition,
Both air cylinders 56, 56 are connected to the base plate 33.
It is attached via brackets 57, 57 to engagement blocks 34, 34 fixed to It's getting old. At the tips of the rods 56a, 56a that extend and retract from the air cylinders 56, 56, a pair of air chucks 58, 58, which also constitute the widthwise tensioning device, are attached.
are fixed to each other via brackets 59, 59, and each air chuck 58 is provided with a pair of claws 58a, 58b which are removable. For example, taking the air chuck 58 on the left side in FIG. 1 as an example, this air chuck 58
As shown in FIG. 3, an air hose 60 is connected to the main body of
A transfer foil 18 is arranged between them. By supplying air through the air hose 60, the air chuck 58 is actuated to close the claws 58a, 58b, thereby pinching the side edge of the transfer foil 18 located between them.

The operation of this embodiment will be explained below.

First, when the movable mold 13 is separated from the fixed mold 12, the first motor 28 receives an operation command signal from a controller (not shown) and rotates in a predetermined feeding direction, whereby the transfer foil 18 is transferred. part is sent out downward, and the next untransferred part of the pattern 17a is transferred to the fixed mold 12 and the movable mold 1.
It is sent to the transfer position between 3 and 3. Then, when the first identification mark 52 provided on the transfer foil 18 reaches the installation position of the first position detector 54 and a predetermined detection strength is obtained, an operation stop signal is output to the first motor 28. Then, positioning in the transport direction by the first position detector 54 is completed. In this case, since a tension force is applied to the transfer foil 18 in the transfer direction via the tension roller 44, the portion of the pattern 17 after the transfer shrinks in the width direction as shown in FIG. As a result, vertical wrinkles 61 . . . 61 are generated that extend to the untransferred pattern 17a at the transfer position, and the second identification mark 53 for positioning in the width direction is also distorted in the width direction. Therefore, in this example, before positioning in the width direction, the transfer foil 1 is
8 is made to be tensioned in the width direction.

First, by extending the two air cylinders 56, 56, the air chucks 58, 58 are moved in the width direction to a position where the transfer foil 18 can be sandwiched between the claws 58a, 58b, as shown by the two-dot chain line in FIG. Thereafter, the air chucks 58, 58 are operated to pinch both sides of the transfer foil 18, respectively.

Next, the air cylinders 56, 56 are contracted while the air chucks 58, 58 are maintained in the clamping operation state, and as shown in FIG. Stretch. Then, the vertical wrinkles 61...61 disappear upstream of the portions held by the claws 58a, 58b of the air chucks 58, 58, so that the untransferred pattern 17a at the transfer position becomes normal, and the widthwise positioning The second identification mark 53 also returns to its straight state.

If the second position detector 55 does not output a predetermined detection strength in this state, the second motor 37 operates until the predetermined detection strength is obtained, thereby adjusting the position in the width direction. That will happen. In this case, the second identification mark 53
Since it is in a straight line state at the second position detector 55, positioning in the width direction can be performed extremely accurately.

(Effects of the invention) As described above, according to the invention, both edges of the transfer foil sent out from the mold with tension applied in the transfer direction are held between the middle part of the transferred pattern,
Even if the transfer foil is tensioned in the width direction in this state, the transfer foil can be tensioned in the width direction so that vertical wrinkles do not extend to the untransferred design at the transfer position.
As a result, even when using transfer foil with a small pattern pitch, the untransferred pattern at the above-mentioned transfer position is prevented from being distorted, and positioning in the width direction can be performed with high precision, resulting in good transfer results. It has the advantage of being obtainable.

[Brief explanation of the drawing]

Figures 1 to 5 show examples of the present invention. Figure 1 is a front view of a simultaneous molding transfer machine, Figure 2 is a central vertical sectional view of the same, and Figure 3 is a cross-sectional view of the simultaneous molding transfer machine. 1 is an arrow view of the air chuck seen from the - line in FIG. 1, FIG. 4 is a schematic configuration diagram showing the state before operation of the width direction tensioning device according to the present embodiment, and FIG. 5 similarly shows the operating state of the above device. It is a schematic block diagram. 6th
The figure is an explanatory diagram of problems in the prior art. 12...Fixed type, 13...Movable type, 17,17
a... Design, 18... Transfer foil, 58... Holding means (air chuck), 56... Drive means (air cylinder).

Claims (1)

[Scope of utility model registration request] A band-shaped transfer foil with a plurality of designs arranged in a longitudinal direction is interposed between a fixed mold and a movable mold, so that the designs on the transfer foil are transferred to the molded product at the same time as the injection molding of the resin molded product. The width direction tensioning device for the transfer foil in the simultaneous forming transfer machine has a pair of tensioning devices disposed on the downstream side in the transfer direction of the transfer foil from the fixed type and the movable type, and sandwiching both side edges of the transfer foil, respectively. 1. A transfer foil tensioning device in the width direction of a simultaneous molding transfer machine, comprising a clamping means and a driving means for driving the clamping means toward and away from each other.