JP2002337182A - Simultaneous molding/transferring method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simultaneous molding/transferring method and device by which upgrading of a print quality is realized by preventing a transfer film from being stretched, when a deep-drawn molded product is to be molded. SOLUTION: A part of a band-like transfer film X to be transferred this time is positioned forward of the cavity-constituting face 3a of a movable mold 3, and under this state, the part of the transfer film X to be transferred is thrust in the direction of the cavity-constituting face 3 by a thrusting member 71. Next, the transfer film X is tightened onto a block 4 by a clamp 31 around the cavity-constituting face 3a and after that, a pair of molds 2 and 3 are clamped following the retreating of the thrusting member 71. Further, a molten resin is injected into a cavity to be formed by the molds 2 and 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simultaneous molding transfer method and apparatus for transferring a predetermined pattern onto the surface of a resin molded product by a transfer film supplied into a mold at the same time as molding the resin molded product. It belongs to the technical field of simultaneous molding transfer method and apparatus.

[0002]

2. Description of the Related Art Conventionally, as a simultaneous molding and transferring apparatus for printing a pattern composed of characters, patterns, etc. on the surface of a resin molded article at the same time as molding a resin molded article, for example, the apparatus must be previously transferred to a base film between a pair of molds. In the state where the transfer film on which the pattern is printed is supplied, these molds are clamped to form a cavity between the molds, a molten resin is injected into the cavity, and the heat and pressure are applied to the transfer film. There is known an apparatus for transferring a pattern on a surface of a resin being cured.

[0003] In this case, the transfer film is fixed around the mold by a film fixing means such as a clamp so as not to move in a state substantially parallel to the front surface of the mold before the molten resin is injected. You. In this state, the molten resin is injected into the cavity, and the pattern is transferred to the resin molded product while the transfer film is rapidly stretched along the inner surface of the cavity by the heat and pressure. Therefore, particularly when a deep drawn resin molded product is formed, the transfer film is unevenly stretched and a pattern is distorted, so that high quality printing cannot be performed.

As means for solving this problem, for example, a simultaneous molding transfer method and apparatus disclosed in JP-A-11-70543 is disclosed. In this method and apparatus, a transfer film is supplied onto a female parting surface, and the transfer film is pressed and fixed on the female parting surface by clamp means, and is pressed and fixed by the clamp means. The transfer film is heated and softened by a first flat platen, and after or in parallel with the heat softening, the transfer film is stretched to a shape similar to the cavity of the female mold. The transfer film stretched to the above-mentioned shape is brought close to the transfer plate stretched along the cavity so as not to contact the second hot plate of a curved surface / polyhedron type having a similar shape slightly smaller than the cavity. The female mold and the male mold are moved to the other side, and the mold is clamped to form a cavity between both molds. It is to perform the injection molding by injecting filling the resin in a fluid state in the Activity.

[0005]

However, in the method and apparatus described in the above publication, after the transfer film is fixed to the parting surface by the clamping means, the transfer film is stretched by heat and brought into close contact with the cavity. Thus, for example, in the case of a transfer film or the like of aluminum vapor deposition, there is a problem that the printed matter is finely cracked by stretching and loses gloss or discoloration of the printed matter.

Accordingly, the present invention provides a simultaneous molding transfer method and apparatus capable of preventing the elongation of the transfer film and improving the printing quality even when molding a deep drawn molded article. As an issue.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is characterized in that it is configured as follows.

First, the invention according to claim 1 of the present application uses a pair of dies having at least one of them provided with a molding recess, and is supplied between the two dies simultaneously with the molding of the resin molded product. This is a simultaneous molding / transfer method for transferring a predetermined pattern onto the surface of a resin molded product using a transfer film, wherein the current transfer portion of a band-shaped transfer film is positioned in front of a molding recess of one mold, and is pressed in this state. The member is used to push the current transfer portion of the transfer film into the molding concave portion, then clamp the transfer film around the molding concave portion to the mold, and then retract the pushing member and then mold the pair of molds. It is characterized in that the molten resin is injected into a cavity formed by the two dies by tightening.

According to the present invention, a pair of molds provided with molding recesses on at least one side are used, and simultaneously with the molding of the resin molded article, the transfer film supplied between the two molds is used to mold the resin molded article. In the simultaneous molding transfer method of transferring a predetermined pattern to the surface, the current transfer portion of the belt-shaped transfer film is positioned in front of the molding recess of one of the molds, and in this state, the current transfer portion of the transfer film is pressed by a pushing member. Is pressed into the forming recess, and then the transfer film is clamped to the mold around the forming recess. Therefore, when the transfer portion of the transfer film is pressed by the pressing member, the belt-shaped transfer film can be fed out freely. Accordingly, the transfer film has a shape similar to the shape of the molding concave portion of the mold without being stretched.

Further, in this state, the transfer film is clamped, and thereafter, the pushing member is retracted, and then the pair of dies is closed. The molten resin is injected into the cavity formed by the two dies. Therefore, the extension of the transfer film during the filling process of the molten resin is also reduced.

As a result, wrinkles and distortions are less likely to occur in the picture transferred to the molded article, and gloss is not easily lost or discolored due to cracks in the printed matter.

The invention according to claim 2 of the present application is
2. The suction device according to claim 1, wherein at least the current transfer portion of the transfer film is pushed into the molding recess by the pushing member and the transfer film is clamped to the mold. In this case, the current transfer portion of the transfer film is sucked into the molding recess.

According to the present invention, at least from the time when the current transfer portion of the transfer film is pushed into the molding recess by the pushing member to the time when the transfer film is clamped to the mold, the suction provided in the mold is provided. Since the present transfer portion of the transfer film is sucked into the molding recess by the device, the belt-shaped transfer film is further fed out. As a result, the present transfer portion of the transfer film pushed into the molding recess by the pushing member is extended. It will be in close contact with the molding recess without being formed.

Next, the invention according to claim 3 of the present application provides a pair of molds each having at least one of them provided with a molding recess.
A film supply device for supplying a transfer film in front of one mold provided with a forming recess, a clamp device for clamping the transfer film around the forming recess, and both molds provided in the other mold; And a molten resin injection device for injecting a molten resin into a cavity composed of: a molded product in the cavity and simultaneously transferring a predetermined pattern from a transfer film to a surface of the molded product. A pressing member for pushing the current transfer portion of the belt-shaped transfer film into the molding recess in a state where the current transfer portion of the transfer film is located in front of the molding recess of one of the molds; And control means for operating the clamping means after being pushed into the inside.

According to the present invention, a pair of molds provided with molding recesses on at least one side are used, and simultaneously with the molding of the resin molded article, the transfer film supplied between the two molds is used to mold the resin molded article. In the simultaneous molding and transferring apparatus for transferring a predetermined pattern to the surface, the current transfer portion of the band-shaped transfer film is positioned in front of the molding recess of one of the molds, and in this state, the current transfer portion of the transfer film is pressed by the pressing member. Is pressed into the molding recess, and then the transfer film is clamped to the mold around the molding recess, so that when the pushing member is pushed in, the band-shaped transfer film is freely fed out, so the transfer film is extended. Without this, the shape becomes similar to the shape of the molding concave portion of the mold.

Further, in this state, the transfer film is clamped, and thereafter, the pushing member is retracted, and then the pair of dies is closed. The molten resin is injected into the cavity formed by the two dies. Therefore, the extension of the transfer film during the filling process of the molten resin is also reduced.

As a result, wrinkles and distortions are less likely to occur in the pattern transferred to the molded product, and gloss is not easily lost or discolored due to cracks in the printed matter.

Further, the invention described in claim 4 of the present application is:
4. The invention according to claim 3, wherein at least a current transfer portion of the transfer film is pressed into the forming recess by a pushing member and then the transfer film is clamped to a mold. It is characterized in that a suction device for sucking inside is provided.

According to the present invention, at least from the time when the current transfer portion of the transfer film is pushed into the forming recess by the pushing member to the time when the transfer film is clamped to the mold, the suction provided in the mold is provided. Since the present transfer portion of the transfer film is sucked into the molding recess by the device, the belt-shaped transfer film is further fed out. As a result, the present transfer portion of the transfer film pushed into the molding recess by the pushing member is extended. It will be in close contact with the molding recess without being formed.

Further, the invention described in claim 5 of the present application is:
The invention according to claim 3 or 4, further comprising a molded product removing means for removing a molded product remaining in a mold provided with the molten resin injection device after opening the mold, wherein the pushing member is provided with the molded product removing means. It is characterized by being attached to.

According to the present invention, the pushing member is attached to the molded product removing means for removing the molded product remaining in the mold provided with the molten resin injection device after the mold is opened. It is not necessary to separately provide a mechanism for moving the device to the front surface or retracting the device.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A simultaneous molding transfer method and apparatus according to an embodiment of the present invention will be described below.

First, the simultaneous molding and transferring apparatus will be described. As shown in FIG. 1, the simultaneous molding and transferring apparatus 1 is equipped with a fixed mold 2 and a movable mold 3 opposed to each other. When the mold 3 is moved in the direction of the fixed mold 2 by a driving means (not shown) and clamped, a cavity Z (see FIG. 7) having a predetermined shape is formed between the two molds 2 and 3, and in this state, the fixed mold A resin product is formed by injecting a molten resin from the mold 2 into the cavity Z.

A transfer film supply device 5 is provided above the block 4 to which the movable mold 3 is fixed. The transfer film supply device 5 is provided above a protruding portion 6b at the upper end of a front plate 6a of a movable machine base 6 which is moved back and forth by driving means (not shown).
, A feed roller 8 that feeds out the transfer film X, a roller 9 that sandwiches the transfer film X between the feed roller 8, and a feed roller 8 that is operated when the transfer film X is supplied. A motor M1 (see FIG. 4) that rotates in the supply direction and allows rotation in accordance with feeding of the transfer film X by an external force except during operation, and rotates the feed roller 8 by rotation of the motor M1. The roll-shaped transfer film X is paid out, and the transfer film X is supplied to the front surface of the movable mold 3. A transfer film winding device 10 for winding the transfer film X on which transfer has been completed is provided near the lower end of the front plate 6a of the movable machine base 6. The winding device 10 includes a winding shaft 11 for winding the transfer film, and a pressing roller 12 for pressing the transfer film X in directions opposite to each other (left and right directions in FIG. 1) to apply an appropriate tension to the transfer film X.
13 and a motor M2 (see FIG. 4) for rotating the winding shaft 11. When the motors M1 and M2 operate in cooperation with each other, the transfer film X is supplied and wound, and the current transfer portion of the transfer film X is positioned in front of the movable mold 3. .

A molten resin injection device 2 for injecting molten resin from the fixed mold 2 is provided inside a fixing machine base 22 to which a block 21 for fixing the fixed mold 2 is attached.
3 are provided. After the molding is completed, the molded product removing robot 24 for removing the molded product Y (see FIG. 8) attached to the front surface of the fixed mold 2.
Is provided on the upper part of the fixed machine base 22. The molded article removing robot 24 has an arm 25 driven by a cylinder and capable of extending and retracting in the front-rear and up-down directions, and a suction pad 26 near the tip thereof. The arm 25 fixes the suction pad 26 to a fixed mold. It is moved in two directions to abut the molded product Y, and in this state, the molded product Y is removed by suction.

As shown in FIGS. 2 and 3, a clamp 31 for fixing the transfer film X to the front surface 4a of the block 4 around the movable mold 3 is provided on the front surface of the movable mold 3. , A pin 3 inserted into a hole provided in the block 4
2 ... 32 are fixed. The block 4 has a U-shape when viewed from above, and its open side is a front plate 6 of the movable machine base 6.
a, and an opening 33 is provided on a side surface thereof. A slide block 34 supported by the opening 33 so as to be able to move back and forth is provided with the pins 32.
The end opposite to the side where the second clamp 31 is attached is fixed. Also, the slide block 34
A piston 35a of a cylinder 35 fixed to the front plate 6a is fixed to the rear surface, and when the cylinder 35 operates, the slide block 34 and the pins 32.
The clamp 31 comes into contact with and separates from the front surface 4 a of the block 4 via the block 32. The above pin 32
32, a spring member 26 is interposed between the inner surface 4b of the block 4 and the front surface 34a of the slide block 34.
The slide block 34 is urged rearward, so that the clamp 31 reliably clamps the transfer film X between the clamp film 31 and the front surface 4a of the block 4 when the clamp film 31 clamps the transfer film X. .

A groove 4 is formed on the front surface 4a of the block 4.
1 is provided so as to surround the movable mold 3, and a plurality of holes 42... 42 extending from the bottom surface of the groove 41 to the upper surface of the block 4 are provided. On the upper surface side of the block 4 of these holes 42.
43 are connected to one end of the groove 41, the holes 42.
Suction device 40 (FIG. 4) which sucks air between the movable mold 3 and the film member X via the three molds 43 to suck the transfer film X in the direction of the cavity forming surface 3a of the movable mold 3.
Connected).

On the front surface of the fixed block 21, a mold supporting portion 21a projecting forward is provided, and the fixed mold 2 is exchangeably mounted. Further, the block 21 has a spherical portion 21b in which a part of the surface on the side of the fixing machine base 22 is cut off, and a supply passage 21c extending from the spherical portion 21b in the fixed mold 2 direction, The spherical part 2
The nozzle 23a of the molten resin injection device 23 is connected to 1b. The fixed die 2 is also provided with a supply passage 2b, which is connected to a connection portion 21d provided at an end of the supply passage 21c of the block 21, so that the nozzle 32a of the molten resin injection device 23 The injected molten resin is supplied to the supply passage 21c, the connecting portion 21d, the supply passage 2
b, it is supplied to a cavity Z formed by the cavity forming surface 3a of the movable mold 3 and the cavity forming surface 2a of the fixed mold 2.

The above-mentioned suction pad 26 is provided on a support member 61 provided at the tip of the arm 25 of the molded article removing robot 24. That is, the spring member 62 is inserted through the pin member 63 extending from the suction pad 26, and the pin member 63 is supported so as to be able to move back and forth.
The suction pad 26 is urged in the direction of the fixed mold 2 by the spring member 62. Further, the suction pad 26 sucks air from between the molded product Y in contact with the suction pad 26 and the suction pad 26 to suction the molded product Y onto the suction pad 26 (FIG. 4). Reference).
According to this, when the arm 25 moves in the direction of the fixed mold 2 and the suction pad 26 is pressed against the molded product Y, the molded product Y is moved by the suction device 63 (see FIG. 4). , And the molded product Y is removed from the mold 2.

The suction pad 26 of the support member 61
On the surface on the side opposite to the side on which the conical pushing members 71, 71 having a curved end portion are attached, a member 6 is provided.
The piston 72a of the cylinder 72 fixed to both side surfaces of the cylinder 72
And is movable in the movable mold 3 direction. Then, the arm 25 moves in the direction of the movable mold 3, and the pushing members 71, 71
The film member X is moved in the movable mold 3
In the direction of the cavity forming surface 3a.

As shown in FIG. 4, the simultaneous molding and transferring apparatus 1 has a control unit 81 for controlling the operation timing of each member of the apparatus 1. (See FIG. 3) to detect a matching mark provided on the transfer film X to generate a reference timing, and control the operation timing so that the devices connected to the control device 81 operate in cooperation with each other. .

Next, the simultaneous molding / transferring method in the present apparatus 1 executed through the control device 81 will be described. First, as a first step, the motor M1 of the transfer film supply device 5 and the motor M2 of the transfer film take-up device 10 are rotated in cooperation with the molds 2 and 3 being opened,
An unused transfer film X is fed out by a predetermined amount toward the front surface of the movable mold 3.

Next, as a second step, as shown in FIG. 5, the robot arm 25 moves in the direction of the movable mold 3, and the tip of the pushing member 71 is moved by the cylinder 72 to the surface of the cavity forming surface of the movable mold 3. In the direction 3a, the transfer film X is pushed into the vicinity of the cavity forming surface 3a of the movable mold 3. At this time, since the transfer film X has not been clamped yet, the transfer film X is newly unwound from the roll as the pushing member 72 moves toward the cavity forming surface 3a. At this time, a gap 91 is left between the transfer film X and the cavity forming surface 3a of the movable mold 3.
At this time, the transfer film X is not stretched.

Next, as shown in FIG. 6, as a third step, the suction device 40 is operated and the holes 42.
1, the transfer film X and the cavity forming surface 3a
Then, the transfer film X is brought into a state of being substantially along the cavity forming surface 3a of the movable mold 3 by sucking the air between them. At this point, the transfer film X has not yet been clamped, so it is newly fed out from the roll.
It will not be stretched.

Next, as a fourth step, the clamp 31 is actuated as shown by the dashed line in FIG. 6 so that the transfer film X is clamped around the movable mold 3. In addition,
During the movement of the clamp 31 in the direction of the front surface 4a of the block 4, since the suction device 40 is operating, the transfer film X is sucked and a new transfer film X is unwound from the roll. The remaining small gap disappears, and the transfer film X comes into close contact with the cavity forming surface 3a of the movable mold 3. The suction device 40
Operates until the transfer film X comes into close contact and the clamp 31 clamps the film X.
The transfer film X is not extended.

Then, as a fifth step, as shown in FIG. 7, the two dies 2 and 3 are clamped, and the supply passage from the injection nozzle 23a into the cavity Z formed by the two dies 2 and 3. The molten resin is injected through the connection portion 21c, the connecting portion 21d, and the supply passage 2b, so that the resin is cured in the cavity Z and the design is transferred to the surface of the molded product Y on the side of the cavity forming surface 3a. The pushing member 72 is retracted to a position where it does not hinder mold clamping due to the shortening of the robot arm 25 before the start of mold clamping. Also at this time, since the molten resin is injected in a state of being in close contact with the cavity forming surface 3a, the transfer film X is not extended.

Next, as a sixth step, the molds 2 and 3 are opened as shown in FIG. At this time, since the molded product Y is in a state of being connected to the residual resin in the passage 2 b of the fixed mold 2, the molded product Y is stuck to the fixed mold 2 side, and the transfer film X Are separated.

Next, as a seventh step, the robot arm 25 is extended and the suction pad 26 is placed on the front surface of the molded product Y.
Is moved, and the molded product is moved to the suction pad 2 by the suction device 63 (see FIG. 4) provided on the suction pad 26.
6, and the molded product Y is collected.

Then, returning to the first step, the simultaneous molding transfer is repeated.

Therefore, according to the present simultaneous molding transfer method and apparatus, the transfer film X is not stretched during the process. As a result, wrinkles and distortions do not occur in the printed matter on the molded article Y due to the stretching of the transfer film X, and the printed matter cracks and loses gloss or discoloration of the printed matter. Absent.

That is, the current transfer portion of the band-shaped transfer film X is positioned in front of the forming recess of the movable mold 3, and in this state, the pressing member 71 moves the current transfer portion of the transfer film X into the forming recess. Since the transfer film X is clamped around the movable mold 3 around the molding concave portion, when the pushing member 71 is pushed,
The belt-shaped transfer film X is fed out freely, and the transfer film X has a shape similar to the shape of the molding concave portion of the movable mold 3 without being stretched.

In this state, the transfer film X is clamped, and then the pushing member 71 is retracted, and then the pair of dies 2 and 3 are clamped. Since the molten resin is injected into the cavity Z, the extension of the transfer film X during the filling process of the molten resin is also reduced.

As a result, wrinkles and distortions are less likely to occur in the pattern transferred to the molded product, and gloss is not easily lost or discolored due to cracks in the printed matter.

Further, after the currently transferred portion of the transfer film X is pushed into the molding recess by the pushing member 71,
Until the transfer film X is clamped around the movable mold 3, the current transfer portion of the transfer film X is sucked into the molding recess by the suction device 40, so that the belt-shaped transfer film X is further fed out. As a result, the transfer film X pushed into the molding concave portion by the pushing member 71.
This time, the transfer portion of this time comes into close contact with the molding concave portion without being stretched.

Since the pushing member 71 is attached to the molded article removing robot 24 for removing the molded article Y, a mechanism for moving the pushing member 71 to the front of the movable mold 3 and retracting the same is provided. There is no need to provide a separate device.

In this embodiment, the pushing member 7
The shape of 1 was a conical shape with a curved end, but depending on the shape of the molded product, the width of the transfer film surface, etc.
For example, the shape may be a horizontally long shape.

In the present embodiment, the cross-sectional shape of the molding concave portion of the movable mold 3 is a horizontally long U-shape. This can be dealt with by changing the shape and quantity of the 71.

In the present embodiment, the operation of the suction device 40 is performed after a predetermined time has elapsed since the pressing member 71 is operated. The operation may be started from the time when the transfer portion is located on the front surface of the movable mold 3 this time.

In this embodiment, both the film supply device 5 and the film winding device 10 have the motor M
1 and M2, but only the winding device 10 has the motor M2.
May be provided.

[0050]

As described above, according to the present invention, even in the case of molding a deep drawing molded product, simultaneous molding transfer capable of preventing extension of the transfer film and improving print quality. It is possible to provide a method and an apparatus.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a simultaneous molding and transferring apparatus according to the present invention.

FIG. 2 is a front view of a main part around a movable mold in the same device.

FIG. 3 is a cross-sectional view of a main part around both dies in the same device.

FIG. 4 is a system diagram of the apparatus.

FIG. 5 is a cross-sectional view of a main part around the two dies when a pressing member of the device is extended.

FIG. 6 is a cross-sectional view of a main part around both molds when a clamp member of the apparatus is pressed against a movable mold.

FIG. 7 is a cross-sectional view of main parts around the two dies when the dies are clamped.

FIG. 8 is a cross-sectional view of a main part around the two dies when the dies are opened and a molded product is adsorbed by an adsorption member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Simultaneous molding transfer apparatus 2 Fixed mold 3 Movable mold 23 Molten resin injection device 24 Mold removal robot (mold removal means) 31 Clamp (clamp means) 71 Push-in member X Transfer film Y Mold Z Z cavity

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yasuyuki Sekiguchi 1-5-15-1 Higashi-Ishizucho, Sakai-shi, Osaka F-term (in reference) 4F202 AD05 AD09 AD10 AG03 CA11 CB01 CB13 CK11 CL02 CQ01 CQ06 CQ07 4F206 AD05 AD09 AD10 AG03 JA01 JB14 JF05 JL02 JQ81

Claims (5)

[Claims] At least one of a pair of molds provided with a molding concave portion is used to mold a resin molded product, and at the same time, a predetermined film is formed on the surface of the resin molded product by a transfer film supplied between the two molds. A simultaneous molding transfer method for transferring a picture, wherein a current transfer portion of a band-shaped transfer film is positioned in front of a molding recess of one mold, and in this state, a current transfer portion of the transfer film is moved by a pushing member. Pushed into the molding recess, then clamped the transfer film to the mold around the molding recess, then retracted the pushing member and closed the pair of molds to form the two molds. Wherein the molten resin is injected into the cavity. 2. At least during a period from a time when a current transfer portion of a transfer film is pressed into a molding concave portion by a pressing member to a time when the transfer film is clamped to a mold, a suction device provided in the mold is used to transfer the transfer film. 2. The simultaneous molding and transferring method according to claim 1, wherein the transfer portion is suctioned into the molding recess. 3. A pair of molds provided with a molding recess on at least one side thereof, a film supply device for supplying a transfer film in front of one of the molds provided with a molding recess, and a transfer recess forming the transfer film. And a molten resin injection device which is provided in the other mold and injects the molten resin into a cavity formed by both molds, and forms a molded product in the cavity. At the same time
A simultaneous molding transfer device that transfers a predetermined pattern from the transfer film to the surface thereof, in a state where the current transfer portion of the band-shaped transfer film is located in front of the molding recess of one mold,
A simultaneous molding and transfer apparatus, comprising: a pushing member for pushing the portion into the forming recess; and a control means for operating the clamp means after the pushing member pushes the current transfer portion of the transfer film into the recess. 4. The at least current transfer portion of the transfer film is sucked into the molding concave portion until at least the current transfer portion of the transfer film is pressed into the molding concave portion by the pushing member and the transfer film is clamped to the mold. 4. The simultaneous molding and transferring apparatus according to claim 3, further comprising a suction device. 5. A molded product removing means for removing a molded product remaining in a mold provided with a molten resin injection device after the mold is opened, and a pushing member is attached to the molded product removing means. The simultaneous molding and transferring device according to claim 3 or 4, wherein