JPH0542955B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in a thermal transfer device capable of realizing continuous transfer onto the outer peripheral surface of a three-dimensional article.

Therefore, the present invention provides a jig that supports and rotates a three-dimensional article, a transfer roll that rolls into contact with the outer peripheral surface of the three-dimensional article supported by the jig, and a long transfer film that is supplied between the two. The target is a thermal transfer device equipped with a unit.

[Conventional technology]

By the way, according to the above-mentioned type of thermal transfer device,
Using the outer peripheral surface of the three-dimensional article as the transfer target surface, it should be possible to continuously transfer the entire circumference or a smaller area thereof. However, in such continuous transfer, if the transfer pressure and transfer speed of the transfer roll to the transfer surface are not kept at appropriate values, there is a risk of partial transfer failure.

Therefore, for example, for a three-dimensional article whose outer circumference is circular, it is easy to keep the transfer pressure and transfer speed constant from beginning to end, so it is easy to achieve good continuous transfer. For three-dimensional articles such as these, it is not easy to achieve good continuous transfer. In other words, when the outer circumferential shape of a three-dimensional article is not circular, the surface to be transferred is only temporarily perpendicular to the imaginary line passing through the rotation center of the jig that supports the article and the rotation center of the transfer roll. , and the angle of inclination always changes and sharply reverses at the corner of the article. However, in such an article, the radius of rotation of the surface to be transferred viewed from the center of rotation of the jig is different for each portion of the surface and is not constant.

For this reason, for three-dimensional objects whose outer periphery is not circular, it is difficult to keep the true transfer pressure in the direction perpendicular to the transfer surface and the transfer speed as the circumferential speed on the transfer surface constant. Therefore, it is difficult to achieve good continuous transfer.

One technique for solving these problems is disclosed in Japanese Patent Publication No. 53-9124. This prior art sequentially detects the actual transfer pressure and transfer speed and automatically corrects for variations from the set transfer pressure and transfer speed, thereby keeping the actual transfer pressure and transfer speed constant. It is intended to maintain the

However, in that prior art, the transfer pressure is not a pressure in a direction perpendicular to the surface to be transferred, but a pressure in a direction along an imaginary line passing through the rotation center of the jig that supports the article and the rotation center of the transfer roll. Therefore, unless correction is made according to the inclination of the surface to be transferred, the true transfer pressure in the direction perpendicular to the surface will actually vary.

However, in this prior art, the transfer site that moves moment by moment along the surface to be transferred depends on whether the transfer site is on a flat portion or approaching a corner portion of the surface at a certain point in time, and The transfer pressure is corrected at any time depending on whether the roll is in contact with a flat portion of the transfer surface at a certain point in a rolling manner in an upward direction or in a downward direction. Until then, it is impossible to implement.

Furthermore, although this prior art is superior in that the transfer speed can be essentially understood as the circumferential speed on the surface to be transferred, it is too difficult to maintain the transfer speed at a certain point. Whether the transfer site is on a flat surface or in a corner of the transferred surface;
Furthermore, it is not possible to finely correct the transfer speed depending on whether the flat surface is moving upward or downward.

In addition, in this prior art, like some other known examples (for example, see Japanese Patent Publication No. 59-28184 and Japanese Patent Publication No. 28185), the transfer pressure is obtained by a hydraulic cylinder. When it comes to control, managing hydraulic oil is generally troublesome, compared to pneumatic control that uses disposable compressed air.
It is unavoidable that both initial cost and running cost will increase.

[Problem that the invention seeks to solve]

Therefore, the present invention solves the above-mentioned problems with the prior art related to thermal transfer devices, and facilitates good continuous transfer of the outer periphery of a three-dimensional object to a transfer target surface even for a three-dimensional object whose outer periphery is not circular. The purpose of the present invention is to provide an improved device that can be realized.

That is, the first object of the present invention is to enable the true transfer pressure in the direction perpendicular to the surface to be transferred to be finely controlled according to the shape of the surface.

A second object of the present invention is to enable the transfer speed, which should be regarded as the peripheral speed of the surface to be transferred, to be finely controlled according to the shape of the surface.

Furthermore, a third object of the present invention is to make it possible to realize pneumatic control of transfer pressure.

[Means for solving problems]

The technical means of the present invention necessary to achieve the above object are as follows.

First, the thermal transfer device to which the present invention is directed includes a jig for removably supporting and rotating a three-dimensional article whose outer peripheral surface is a surface to be transferred, and a jig for removably supporting and rotating the three-dimensional article whose outer circumferential surface is a transfer surface, and a jig for rotating the three-dimensional article supported by the jig. It is equipped with a transfer roll that rolls into contact with the surface to be transferred, and a unit that supplies a long transfer film between the two.

In this device, the jig is connected to a pneumatic cylinder that presses the transferred surface of the three-dimensional object supported by the jig against the transfer roll, and a DC servo motor that rotates the jig. There is. The former pneumatic cylinder constitutes a transfer pressure control system together with an electro-pneumatic regulator that operates the cylinder according to the input set pressure value, and the latter DC servo motor operates according to the input set pressure value. Together with a pulse encoder that detects the actual rotational speed of the motor that corresponds to the set speed value, it constitutes a transfer speed control system. Also, those electric
The pneumatic regulator, the DC servo motor, and the pulse encoder are connected to an arithmetic circuit into which preprogrammed transcription data is input, and this arithmetic circuit is used to detect the transfer portion that moves moment by moment along the transfer surface of the three-dimensional article. A function to determine the value based on the detected value inputted to the circuit from the above-mentioned pulse encoder, and a function to output the set pressure value and set speed value corresponding to the transfer site at each time from the above-mentioned transfer data. It is equipped.

[Effect]

In the thermal transfer device configured as described above, transfer of a three-dimensional article onto a surface to be transferred is realized in the following manner.

First, a three-dimensional object to be transferred is supported by a jig, and this jig is pushed toward a transfer roll by a pneumatic cylinder operated by an electro-pneumatic regulator, so that the transfer start portion of the surface to be transferred is moved onto the roll. After pressing the jig, the jig is rotated by a DC servo motor. Then, as the jig rotates, the transfer portion that the transfer roll contacts on the transfer surface moves momentarily along the transfer surface, and the transition status is monitored by a calculation circuit using a pulse encoder. are input sequentially to Therefore, the arithmetic circuit always grasps the latest position of the transcription site, which changes every moment.

On the other hand, this arithmetic circuit outputs a set pressure value toward the electro-pneumatic regulator from the time when the transfer start portion of the transfer surface is pressed against the transfer roll.
This electro-pneumatic regulator has responsiveness comparable to that of known hydraulic control servo valves, and accurately operates a pneumatic cylinder in accordance with a given set pressure value. However, the above set pressure value is
It is picked up from among the transcription data input to the arithmetic circuit and updated as the transcription site shifts. Therefore, if the part related to the set pressure value in the transfer data is programmed sufficiently correctly corresponding to the shape of the transferred surface from the transfer start site to the transfer end site, the true value in the direction perpendicular to the surface The transfer pressure is always kept at the optimum value even though the transfer site shifts. And further, depending on whether the transfer site at a given time is on a flat part of the transfer surface or approaching a corner, or whether the transfer roll is At this point, it is also possible to arbitrarily increase or decrease the transfer pressure depending on whether the contact is rolling in an upward direction or in a downward direction.

Furthermore, the arithmetic circuit outputs a set speed value to the DC servo motor from the time when the transfer start portion of the transfer surface is pressed against the transfer roll.
This DC servo motor has excellent responsiveness and accurately rotates the jig according to a given set speed value. However, the above set speed value is picked up from the transcription data input to the arithmetic circuit, and is updated as the transcription site moves. Therefore, if the part related to the set speed in the transfer data is programmed sufficiently correctly corresponding to the shape of the transferred surface from the transfer start site to the transfer end site, the transfer speed as the peripheral speed is It is always maintained at the optimum value even though the parts change. And further, depending on whether the transfer site at a given time is on a flat part of the transfer surface or approaching a corner, or whether the transfer roll is At this point, it is also possible to arbitrarily increase or decrease the transfer speed depending on whether the contact is rolling in an upward direction or in a downward direction.

〔Example〕

Next, specific embodiments of the present invention will be described with reference to the drawings.

First, a three-dimensional article 1 whose entire circumference or less than the outer peripheral surface is a transfer surface 11 is prepared using a rotatable jig 2.
It is removably supported by. The transfer roll unit 3 paired with this jig 2 has a transfer roll 31 that rolls into contact with the transfer surface 11 of the article, is rotatable so as to rotate together with the rotation of the article, and is used for heating. It is equipped with a heater 32.
Therefore, when the transfer roll 31 is heated to a required temperature by the heater 32 and the transfer surface 11 of the article 1 is pressed against it, it rotates as the article rotates.

Next, the transfer surface 11 of the three-dimensional article 1 and the transfer roll 3
A unit for supplying the long transfer film 4 between the transfer film 1 and the transfer film 1 is divided into a winding part 6 as well as a feeding part 5 for the film. The former feeding part 5
a feeding shaft 51 and a motor 52 for applying back tension to the fed film 4;
It consists of a powder clutch 53 that causes a desired slippage between the two at any time, and the latter winding section 6 detects a winding shaft 61, a DC servo motor 62 for winding, and the amount of movement of the transfer film 4. The DC motor 62 is driven via a driver 64. Therefore, the transfer film 4 is pulled out from the feeding shaft 51 while being tensioned with the required tension, and
It passes between the transfer roll 31 and the transferred surface 11 pressed thereto, and is wound onto the winding shaft 61.

On the other hand, a transfer pressure control system 7 for pressing the transferred surface 11 of the three-dimensional article supported by the jig 2 against the transfer roll 31 is connected to a pneumatic cylinder 71 connected to the jig 2 and a set pressure. an electro-pneumatic regulator 7 that operates the cylinder according to the value;
2, and is equipped with a compressed air source 73. Therefore, the pneumatic cylinder 71 moves the jig 2 forward and backward relative to the transfer roll 31 in response to the air pressure supplied while being adjusted by the electro-pneumatic regulator 72.
The transfer surface 11 of the article 1 supported by the jig is pressed against the roll 31.

Further, the transfer speed control system 8 for rotating the jig 2 is controlled by a DC servo motor 81 connected to the jig.
and a pulse encoder 82 that detects the actual rotational speed of the motor, and the DC motor 81 is driven via a driver 83. Therefore, the jig 2 supports the transferred surface 11 of the article supported by the jig 2.
is rotated while being pressed against the transfer roll 31.

However, the arithmetic circuit 9 that controls each of the control systems 7 and 8 described above is, for example, abbreviated as CPU,
Transfer data programmed in advance according to the shape of the transferred surface 11 of the article is transferred to the data recorder 10.
It is now input from This arithmetic circuit 9 has a function of determining the transfer site that moves moment by moment along the transferred surface 11 based on the detection value inputted to the circuit from the pulse encoder 82, and corresponds to the transfer site at each point in time. It has a function of picking up the set pressure value and set speed value from the transfer data and outputting them to the electro-pneumatic regulator 72 and jig rotation motor 81, respectively. Therefore, this arithmetic circuit 9 picks up the set pressure value and established speed value for each time point from the transfer data programmed in advance, operates each control system 7, 8, and operates the control system 7, 8 in the direction perpendicular to the transfer surface 11. While adjusting the true transfer pressure and the transfer speed, which should be regarded as the circumferential speed of the transfer surface, to the above-mentioned respective set values, the transfer to the transfer surface 11 is continuously performed.

The arithmetic circuit 9 in this embodiment also has a function of outputting a setting braking value to the powder clutch 53 of the film feeding section 5 to adjust the tension of the transfer film 4, and a function of adjusting the tension of the film winding section 6. It has the functions of outputting a set winding value to the winding motor 62 and controlling the winding amount of the transfer film 4 in response to a detected value from the pulse encoder 63.

〔Effect of the invention〕

According to the present invention as described above, the true transfer pressure in the direction perpendicular to the transfer surface and the transfer speed, which should be regarded as the circumferential speed of the transfer surface, are both programmed in advance in accordance with the shape of the surface. Since the grain can be finely controlled according to the transferred data, it is possible to easily achieve good continuous transfer on the outer circumferential surface of a three-dimensional object whose outer circumferential shape is not circular. Further, according to the present invention, there is no need to employ hydraulic control, which is troublesome in managing hydraulic fluid, so that the initial cost and running cost of the thermal transfer device can be reduced, and its maintenance management can be facilitated.

[Brief explanation of the drawing]

The figure is a system diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Three-dimensional article, 11...Transfer surface, 2...Jig, 3...Transfer roll unit, 31...Transfer roll, 32...Heater, 4...Transfer film, 5
... Film feeding section, 6 ... Film winding section, 7 ... Transfer pressure control system, 71 ... Pneumatic cylinder, 72 ... Electro-pneumatic regulator, 73 ... Compressed air source, 8 ... Transfer speed control system , 81...DC servo motor, 82...Pulse encoder, 9...
...Arithmetic circuit, 10...Data recorder.

Claims (1)

[Claims] 1. A jig for removably supporting and rotating a three-dimensional article whose outer peripheral surface is a transfer surface, and a jig for rolling and contacting the three-dimensional article supported by the jig with the transfer surface. This is a thermal transfer device that is equipped with a transfer roll that can be transferred, and a unit that supplies a long transfer film between the two, and the jig is equipped with a transfer roll that transfers the transfer surface of a three-dimensional object supported by the jig together with the jig. A pneumatic cylinder that presses against the transfer roll is connected to a DC servo motor that rotates the jig, and the former pneumatic cylinder is an electro-pneumatic regulator that operates the cylinder according to an input set pressure value. The latter DC servo motor constitutes a transfer speed control system together with a pulse encoder that detects the actual rotation speed of the motor that corresponds to the set speed value input thereto. The electro-pneumatic regulator, the DC servo motor, and the pulse encoder are connected to an arithmetic circuit into which preprogrammed transcription data is input, and this arithmetic circuit includes a A function that determines the transfer site that moves moment by moment based on the detection value input from the pulse encoder to the circuit, and a set pressure value and a set speed value corresponding to the transfer site at each time point are determined based on the transfer data. A thermal transfer device characterized by being equipped with a function of outputting from inside.