JPS6349461A - Thermal transfer device - Google Patents

Abstract

PURPOSE:To enable fine control of real transfer pressure in the direction perpendicular to a face being transferred with high fidelity according to the profile of the face, by providing a jig for rotating a cubic material having an outer circumferential face which is a face being transferred while supporting dismountably, a transfer roll rollable and contactable against the face being transferred of the cubic material and a unit for feeding a long transfer film. CONSTITUTION:A transfer pressure control system 7 for pressing a face being transferred 11 of a cubic material supported by a jig 2 against a transfer roll 31 comprises a pneumatic cylinder 71 coupled to the jig 2, an electrical- pneumatic regulator 72 for operating the cylinder according to a setting pressure and a compressed air source 73. A transfer speed control system 8 for rotating the jig 2 comprises a D.C. servo motor 81 coupled to the jig and a pulse encoder 82 for detecting the actual rotation of the motor where the D.C. motor 81 is driven through a driver 83. Consequently, the jig 2 rotates with the face being transferred of the material pressing against the transfer roll 31. Consequently, a continuous transfer with high fidelity to the outer circumferential face can be realized easily even for a cubic material having non-circular profile.

Description

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

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

[Conventional technology]

By the way, according to the above-mentioned type of thermal transfer device, it should be possible to continuously perform transfer over the entire circumference or less than the outer peripheral surface of a three-dimensional object as the transfer target surface. 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 three-dimensional objects whose outer periphery is circular, it is easy to keep the transfer pressure and transfer speed constant throughout, and it is easy to achieve good continuous transfer, but for other objects, such as cubic or rectangular objects, For certain three-dimensional articles, 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 at right angles to an imaginary line passing through the rotation center of the jig that supports the article and the rotation center of the transfer roll. In most cases, the article is tilted, and the tilt angle always changes, with a sharp reversal occurring at a 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 differs from part to part of the contact surface and is not constant.

Therefore, for three-dimensional articles whose outer circumference 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, and therefore it is difficult to realize 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,
The purpose is to automatically correct these fluctuations from the set transfer pressure and transfer speed, thereby keeping the actual transfer pressure and transfer speed constant.

However, in this 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 transfer surface, the true transfer pressure in the direction perpendicular to the surface to be transferred will actually vary.

However, in this prior art, depending on whether the transfer site that moves along the surface to be transferred every moment is on a flat part of the contact surface or approaching a part of the corner,
In addition, the transfer pressure is corrected as needed depending on whether the transfer roll is in contact with a flat portion of the transfer surface so as to roll in an upward direction or in a downward direction. It is impossible to do something like this.

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 keep the transfer speed constant. Depending on whether the part is on a flat surface of the transferred surface or a part of a corner, and whether it is moving up or down the flat surface, etc.
It is not possible to precisely correct the transfer speed.

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), transfer pressure is obtained by a hydraulic cylinder; In this case, management of hydraulic fluid is generally troublesome, and both initial cost and running cost are inevitably higher than in pneumatic control using disposable compressed air.

[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 transfer surface to be finely controlled according to the shape of the core.

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

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

c. 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 such a device, the jig is connected to a pneumatic cylinder that applies the transfer surface of the three-dimensional object supported by the jig to the transfer roll, and a DC servo motor that rotates the jig. has been done.

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 at the set speed input to it. Together with a pulse encoder that detects the actual rotational speed of the acid motor that corresponds to the value, it constitutes a transfer speed control system. In addition, these electric vacuum regulator DC servo motors and pulse encoders are connected to an arithmetic circuit into which preprogrammed transfer data is input, and this arithmetic circuit operates along the transfer surface of the three-dimensional article. A function that determines the transfer site that changes moment by moment based on the detected value input from the above-mentioned pulse encoder to the circuit, and a set pressure value and a set speed value corresponding to the transfer site at each time point from the above transfer data. It also has a function to output.

[For production]

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, the three-dimensional object to be transferred is supported by a jig, and this jig is pushed toward the 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 placed on the roll. After pressing, 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 sequentially transmitted to the arithmetic circuit by the pulse encoder. is input. Therefore, the arithmetic circuit always grasps the latest position of the transcription site, which changes from moment to moment.

On the other hand, this arithmetic circuit outputs a set pressure value toward the transfer start site regulator on the transfer target surface.

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 picked up from among the transfer data input to the arithmetic circuit, and is updated as the transfer site moves. Therefore, if the part related to the set pressure value in the transcription data is programmed correctly enough to correspond to the shape of the transfer target surface from the transcription start site to the transcription end site, the summer in the direction perpendicular to the core The transfer pressure is always kept at the optimum value even though the transfer site shifts. Furthermore, depending on whether the transfer site is on a flat part of the transfer surface or approaching a corner, or when the transfer roll is against a flat portion of the transfer surface, The above calculation circuit arbitrarily adjusts the transfer pressure depending on whether the contact is rolling in the direction or in the downward direction. From this point on, output the set speed value towards the DC servo motor.

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 among the transfer data input to the arithmetic circuit, and is updated as the transfer site moves. Therefore, if the part related to the set speed 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 transfer speed as a circumferential speed is
Even though the transcription site shifts, it is always kept at an optimal value. Furthermore, depending on whether the transfer site is on a flat part of the transfer surface or approaching a corner, or when the transfer roll is against a flat portion of the transfer surface, It is also possible to arbitrarily increase or decrease the transfer speed depending on whether the contact is rolling in the direction or in the downward direction.

〔Example〕

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

First, transfer the entire circumference of the outer circumferential surface or the area below it to the transfer surface 11.
A three-dimensional article 1 is supported by a rotatable jig 2 so as to be capable of film attachment. The transfer roll unit 3 paired with this jig 2 has a transfer roll 3I 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 II of the article I is pressed against it, it rotates as the article rotates.

Next, a unit for supplying the long transfer film 4 between the transfer surface 11 of the three-dimensional article 1 and the transfer roll 31 is as follows:
The film is divided into a feeding section 5 and a winding section 6 as well. The former feeding section 5 consists of a feeding shaft 51, a motor 52 for applying back tension to the fed film 4, and a powder clutch 53 that causes desired slippage between the two at any time. 6 consists of a winding shaft 61, a DC servo motor 62 for winding, and a pulse encoder 63 for detecting the amount of movement of the transfer film 4, and the DC motor 62 is driven via a driver 64. . Therefore, the transfer film 4 is pulled out from the payout shaft 51 while being kept under the required tension, passed between the transfer roll 31 and the transferred surface 11 pressed against it, and then wound onto the take-up shaft 61. It turns out.

On the other hand, the transfer surface l of the three-dimensional article supported by the jig 2]
The transfer pressure control system 7 for pressing the transfer roller 31 against the transfer roll 31 includes a pneumatic cylinder 71 connected to the jig 2, and an electro-pneumatic regulator 72 that operates the cylinder according to a set pressure value. An air source 73 is provided. Therefore, the pneumatic cylinder 71 moves the jig 2 forward and backward relative to the transfer roll 31 in response to the supplied air pressure while being regulated by the electro-pneumatic regulator 72, and moves the jig 2 forward and backward with respect to the transfer roll 31, so that the transferred surface of the article l supported by the jig is 11, the above roll 3]
press against.

A transfer speed control system 8 for rotating the jig 2 includes a DC servo motor 81 connected to the jig, and a pulse encoder 82 that detects the actual rotation speed of the motor. is driven via a driver 83. Therefore, the jig 2 rotates while pressing the transferred surface II of the article supported by the jig 2 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, it is abbreviated as CPU, and transfer data programmed in advance according to the shape of the transfer surface 11 of the article is inputted from the data recorder 10. 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 amplifies the set pressure value and the set speed value for each point in time from the transfer data programmed in advance and operates each control system 7.8 in a 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.

Note that the arithmetic circuit 9 in this embodiment also includes:
A function of outputting a set braking value to the powder clutch 53 of the film feeding section 5 described above to adjust the tension of the transfer film 4, and a winding motor 62 of the film winding section 6.
The set winding value is output to the pulse encoder 6.
It also has the function of controlling the winding amount of the transfer film 4 in response to the detected value from the transfer film 3.

〔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 correspondence to the shapes of several surfaces. According to the transfer data obtained, fine grain (grain control) can be controlled, so even for a three-dimensional object whose outer circumferential shape is not circular, it is possible to easily achieve good continuous transfer on the outer circumferential surface.Furthermore, according to the present invention, Since there is no need to use hydraulic control, which is troublesome to manage oil, the initial cost and running cost of the thermal transfer device are reduced.
Moreover, its maintenance and management can be facilitated.

[Brief explanation of drawings]

The figure is a system diagram showing an embodiment of the present invention. 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--Electronic pneumatic regulator, 9--Arithmetic circuit, 10--Data recorder

Claims (1)

[Claims] (1) A jig that removably supports and rotates a three-dimensional article whose outer peripheral surface is a transfer surface, and a transfer roll that is brought into rolling contact with the transfer surface of the three-dimensional article supported by the jig. , a unit that supplies a long transfer film between the two, and the jig is equipped with a unit that supplies a long transfer film between the two, and the jig is equipped with a transfer surface of a three-dimensional object supported by the jig and the above-mentioned transfer roll. A pneumatic cylinder that presses the jig is connected to a DC servo motor that rotates the jig. The latter DC servo motor constitutes a transfer speed control system together with a pulse encoder that detects the actual rotational speed of the motor that corresponds to the set speed value input thereto, and their electro-pneumatic The 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 has the ability to transfer the transfer portion that moves moment by moment along the outer circumferential surface of the three-dimensional article. It has a function to make a judgment based on the detected value inputted to the circuit from the pulse encoder of the circuit, and a function to output a set pressure value and a set speed value corresponding to the transfer site at each time point from the above transfer data. A thermal transfer device characterized by: