JPS5832930Y2 - thermal transfer device - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a thermal transfer device that uses a transfer roll, and when the outer peripheral surface of a three-dimensional object is the transfer surface,
Even if the outer circumferential surface is tapered, continuous transfer to a steel surface can be performed satisfactorily.

By the way, a thermal transfer device equipped with a roll-shaped transfer body called a transfer roll uses the outer circumferential surface of a three-dimensional article as a transfer surface.
Continuous transfer to this can be easily performed,
Therefore, it has been prized as being suitable for transfer that involves making half a turn or a full turn around the article.

However, as shown in FIG. 1, the above-mentioned thermal transfer device basically uses a transfer roll A heated by an appropriate heat source to transfer the outer peripheral surface of a three-dimensional article B, which is held by an appropriate jig and rotated in the direction of the arrow. , that is, while being pressed against the surface to be transferred, a transfer film ct is sandwiched between them, which is moved in the direction of the arrow at a speed equal to the circumferential speed (i.e., transfer speed) of the article,
T-transfer is performed continuously from the film to the transfer surface.

Therefore, in such an apparatus, it is necessary to bring the rolling T roll A into line contact with the outer peripheral surface of the three-dimensional article B to enable continuous transfer.

This requirement is such that if the outer peripheral surface of the three-dimensional article B is tapered, the center line 0A-()A(!:0R-OB) of the transfer roll A and the article H should be aligned. This can be satisfied simply by arranging them so that they are parallel to each other, but if the outer circumferential surfaces are tapered, they can be aligned with their respective center lines 0A as shown in FIGS. 2 and 3.
- Except for cases where the taper is extremely slight, which can still be satisfied even if OA and oB are arranged obliquely in a common plane (horizontal plane in the example), the following Problems remain.

That is, when the outer peripheral surface of the three-dimensional article H is tapered,
The developed shape of the outer circumferential surface, which is the transferred surface, is curved as shown in FIG. There is a big difference between the left side and the left side.

On the other hand, the outer peripheral surface of the transfer roll A is cylindrical,
Even if it is unfolded, it will not have the curved shape described above.

Therefore, when the transfer roll A rolls on the above-mentioned transfer surface, even if the roll is initially perpendicular to the longitudinal direction of the transfer surface, it will gradually become tilted as the transfer progresses. If this is not possible, unreasonable slippage will occur on the surface to be transferred (correctly, on the back surface of the transfer film), and continuous thermal transfer will not be possible.

However, with conventional thermal transfer devices, no consideration has been given to this point, so if the outer peripheral surface of a three-dimensional object has even a slight taper, it tends to cause defects in thermal transfer to a linear surface. Ta.

The thermal transfer device according to the present invention addresses the above-mentioned conventional problems and enables continuous thermal transfer even to the outer circumferential surface of a tapered three-dimensional article. The roll can be tilted freely within a plane perpendicular to a plane common to the rain center line of the roll and the three-dimensional article, and the tilt is restored each time one transfer is completed. It is designed to do the following.

This will be described in detail below with reference to the embodiment shown in FIGS. 5 and 6.

In the figure, reference numeral 1 denotes a transfer roll made of a heat-resistant elastic material such as silicone rubber, which corresponds to the transfer roll A shown in FIGS. 1 to 4. It is rotatably supported by a horizontal support shaft 3 that is horizontally suspended in the left-right direction.

Reference numeral 4 denotes a heat insulating cover attached to the center of the front surface of the support plate 2 so as to cover the roll 1, and a suitable heat source for heating the roll 1 to a required temperature is provided in a recess in the front surface of the cover. 5 shall be provided.

6 is a pressure substrate parallel to the back surface of the support plate 2,
It is fixed to a vertical frame 8 via a relay shaft 7, and this frame 8 is fixed to a pivot shaft 10 between horizontal frames 9, 9.
．． It is assumed that it can be moved slightly back and forth around 10.

However, the above-mentioned support plate 2 has one rotational support shaft 1 oriented in the front-rear direction with respect to the center position of the above-described pressure base plate 6.
1, and is rotatable about the support shaft on the front surface of the pressure substrate 6.

Further, the rotation support shaft 11 described above is positioned so that its forward extension center line intersects the middle of the center line of the support shaft 3, and the weight of the left and right sides of the support plate 2 including the transfer roll 1 is reduced. Care has been taken to balance the distribution.

Therefore, the transfer roll 1 is supported by the support shaft 3 with the rotation support shaft 11 as the center, and can freely tilt from a horizontal position.

The support plate 2 is provided with a means for restoring the above-described inclination of the transfer roll 1 to a horizontal state.
In the illustrated example, springs 12, 12 are suspended between the left and right ends of the support plate and the horizontal frame, respectively, and air cylinders 13 for pushing the horizontal frame 9 are provided at both left and right ends of the support plate.
．． 13 are provided.

However, the above-mentioned springs 12, 12 act directly on the support plate 2 to restore the transfer roll 1 from an inclined position to a horizontal position, and also function to keep the transfer roll 1 in the horizontal position. , 13 function to push the top surface of the horizontal frame 9 with the tip of the plunger 14 only when the transfer roll 1 is to be restored, that is, when the transfer is completed, and at other times, the plunger is in a free state. It is made to be.

Therefore, the spring 12 can be made to have a weak spring pressure since the air cylinder 13 operates at the time of restoration, so that when the transfer roll 1 is tilted to maintain line contact with the surface to be transferred, the inclination is not hindered. You can do it like this.

Note that even if the air cylinder 13 is not provided, the transfer roll 1 can be restored using only the spring 12, but in this case, it takes time to restore the roll 1, so a strong spring is used to achieve instantaneous restoration. In this case, there is a possibility that the inclination of the transfer roll 1 may be hindered.

- In the above-described configuration, the transfer roll 1 is now advanced by an appropriate mechanism (not shown), and the transfer roll 1 is moved forward by a suitable mechanism (not shown), and the transfer roll 1 is moved forward by a suitable mechanism (not shown), and the transfer roll 1 is moved forward by a suitable mechanism (not shown).
As shown in , it is assumed that a three-dimensional article B whose outer circumferential surface is tapered is pressed so as to be in line contact with the outer circumferential surface of the three-dimensional article B, that is, the surface to be transferred, via a transfer film C.

In this case, at the start of transfer, one transfer roll is perpendicular to the longitudinal direction of the transfer surface, which has a curved developed shape as shown in FIG. 4, as shown by the chain line in the same figure. It should be noted that

In other words, one transfer roll and three-dimensional article B have their respective center lines 0.
As shown in FIGS. 1 to 3, A-OA and OB ( ) B are located in a common horizontal plane and are obliquely intersected to achieve line contact between the two.

In such a state, when the transfer is started, the transfer roll 1
Since A rolls on a relatively curved surface to be transferred, it cannot maintain a horizontal posture perpendicular to this surface forever, and tends to tilt within a vertical plane according to the taper of the linear surface.

However, the support plate 2 that supports the transfer roll 1 is attached to the rotation support shaft 1.
1, and the plunger 14 of the air cylinder 13 at this time is in a free state.

Therefore, as the transfer progresses, the transfer roll 1A begins to gradually tilt along with the support plate 2 against the spring 12 around the rotational support shaft 11.

That is, the transfer roll A gradually begins to incline within the vertical plane in order to maintain a line contact state with the three-dimensional object B, and by the time the transfer is completed, the inclined center line has been tilted as shown by the chain line in FIG. 3, for example. OA/ OA/ comes to adopt the posture shown above.

After the transfer to one three-dimensional object B is completed in this way, when one transfer roll is moved backward by a mechanism not shown, the restoring elasticity of the spring 12 on either the left or right causes the air cylinder 13 on the other side to move backward. , plunger 14
In addition, the movement of pushing the horizontal frame 9 is taken into account, and these act directly on the support plate 2, so that the transfer roll 1 changes from its previous tilted position to a horizontal position around the rotation support shaft 11. The posture is instantly restored, and both left and right springs 12
, 12, it is maintained in a horizontal position in preparation for the next transfer.

As described above, the thermal transfer device according to the present invention allows the transfer roll to be freely tilted within a plane perpendicular to a plane common to the rain center line of the roll and the three-dimensional article with which it is to be brought into line contact. Because of this structure, even when the outer circumferential surface of the three-dimensional article is tapered, the transfer roll can be brought into rolling contact with the ridged surface in a line-contact state from start to finish, and therefore the taper It can be expected that continuous transfer, such as half a turn or one turn, can be carried out favorably even on the outer circumferential surface to which it has been attached.

[Brief explanation of drawings]

1 to 4 schematically show a thermal transfer device in which the present invention is implemented, in which FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is a rear view. FIG. 4 is a developed view of the surface to be transferred, FIG. 5 is a front view showing an embodiment of the present invention, and FIG. 6 is a partially cutaway side view. A: Transfer roll, B: Three-dimensional article,
b... Transferred surface, C... Transfer film, 0A-OA... Transfer roll center line, o B
-o B...Three-dimensional article center line, 1...
Transfer roll, 2...Support plate, 11...
Rotating shaft, 12... Spring, 13... Air cylinder.

Claims (1)

[Scope of utility model registration request] A transfer roll to be brought into line contact with the outer circumferential surface of the three-dimensional article through a transfer film is supported so as to be freely tiltable within a plane perpendicular to a plane common to the center line of both, and A thermal transfer device characterized in that it is equipped with means for restoring the inclination after the transfer is completed.