JPH0450138Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a transfer film feed control device.

(Prior art) For example, thermal transfer devices (hot stamps) and simultaneous molding transfer devices used to transfer designs consisting of designs, letters, etc. onto the surface of resin molded products,
As is well known, in the case of a thermal transfer device using a transfer film with a transfer pattern drawn on the film surface,
The transfer pattern part of this transfer film is pressed onto the object to be transferred using a transfer roll or a hot plate.
Through the action of this pressure and the heat applied to the transfer roll, etc., the above-mentioned pattern is transferred to the surface of the transferred object, and in the case of a simultaneous forming transfer device, the above-mentioned transfer film is transferred to a gold plate. The molds are joined together after being supplied between the molds, and molten resin is injected into the cavity to form a resin molded product, and at the same time, a pattern is transferred to the surface of the resin molded product.

By the way, in the above-mentioned transfer device, the transfer film is fed a fixed amount every time the thermal transfer operation is performed, and an unused part of the transfer film, that is, a new pattern part for transfer, is created between the transferred object and the transfer roll or between the mold. In this case, in order to manufacture high-quality painted products, it is required that the transfer film be sent accurately in fixed quantities, and on the other hand, in order to increase production efficiency, the transfer film is It is required to supply the material at a high speed.

Therefore, conventionally, as shown in FIG. 5, a large number of transfer patterns A are drawn in a line on the film surface at equal pitch intervals, and positioning marks B of a desired shape are placed on the sides of the film. Using a transfer film C on which marks B are similarly written at the required fixed pitch intervals, a mark detection box D is provided at an appropriate position on the feeding path of the transfer film C, and photoelectric conversion means E ₁ , E ₂ provided in this box D are used. are arranged on the upstream side and the downstream side, and as the transfer film C is fed in the direction of the arrow, first the upstream side photoelectric detection means
When E ₁ detects the above positioning mark B,
The detection signal activates the relay in the mark detection box D mentioned above, and sends a film feed speed switching signal to the drive circuit of the electric motor for film feed to feed the transfer film C, which had been fed at a relatively high speed up until then. The speed is decelerated, and then, in this low-speed feeding state, the downstream photoelectric detection means E ₂
When the upstream photoelectric detection means E ₁ detects the same positioning mark B, the electric motor is stopped, thereby feeding the transfer film C by a fixed amount, and at the same time transferring the transfer pattern A. A device that stops the device at a fixed position is being considered.

According to such a mechanism, the upstream photoelectric detection means
The transfer film C can be fed at high speed until _F1 detects the positioning mark B, which speeds up the film supply.At the same time, since the film feed is stopped while the transfer film C is running at a low speed, the transfer film C can be fed at high speed. High-quality products can be manufactured by accurately stopping and eliminating displacement of the transfer pattern A with respect to the object to be transferred.

(Problem to be solved by the invention) In the above control device, the distance L ₁ between the upstream and downstream photoelectric detection means E ₁ and E ₂ is determined by the structure of the thermal transfer device, the control circuit configuration, and other aspects. It may be set for a long time. In addition, in the case where the film feed speed switching signal is generated by a relay as in the conventional circuit described above, there are variations in the control response of the relay and it is not possible to respond quickly to the detection signal. ₂ is transfer film C
In order to detect the positioning mark B in the low-speed feeding state, the distance L ₁ between the upstream photoelectric detection means E ₁ and the downstream photoelectric detection means E ₂ must be adjusted to take into account variations in the responsiveness of the relays. Therefore, it was necessary to set it relatively long for safety reasons.

However, when the above-mentioned arrangement interval L ₁ is set to a long value, the upstream photoelectric detection means
When E ₁ decelerates the film feed speed when it detects the positioning mark B, the transfer film is then fed at low speed over a long distance to the downstream photoelectric detection means E ₂ , and the positioning mark B is moved downstream. It takes too much time to reach the side photoelectric detection means _E2 , resulting in a large time loss and hindering high-speed thermal transfer.

Therefore, the present invention is capable of accurately feeding the transfer film in a fixed amount, but also reduces the time required for feeding the film in a fixed amount even when the mark detection means between upstream and downstream is set to a long interval. An object of the present invention is to provide a transfer film feeding control device that enables short and efficient thermal transfer.

(Means for Solving the Problems) That is, the present invention uses two positioning marks, which are written at predetermined pitch intervals in the longitudinal direction of the transfer film, arranged on the upstream side and the downstream side in the film feeding direction. The transfer film is detected by a mark detection means, and the film feeding speed is reduced by the detection of the mark by the upstream mark detection means, and the film feeding is stopped by the detection of the same mark by the downstream mark detection means. In the feed control device, a circuit for generating a deceleration signal to reduce the transfer speed of the transfer film and a stop signal to stop the transfer is configured with an IC logic circuit, and
The present invention is characterized in that it includes a timer that delays the output timing of the deceleration signal from the time when the mark is detected by the upstream mark detection means to the time when the mark is detected by the downstream mark detection means.

(Function) According to the above configuration, a timer is provided which delays the output timing of the film deceleration signal. Therefore, even if the distance between the upstream mark detection means and the downstream mark detection means is set long, the output timing of the film deceleration signal is delayed so that the transfer film is fed at high speed for most of the distance, thereby making it possible to run between the mark detection means without losing time.

Moreover, the present invention uses an IC logic circuit as a circuit for creating a film deceleration signal when the upstream mark detection means detects a positioning mark.
The film deceleration signal can be generated in response to mark detection quickly and without variation. Therefore, even if the delay time by the timer is set until just before the downstream mark detection means detects the positioning mark, the film speed is quickly switched to low speed as soon as the time is up, so that the downstream mark detection means cannot detect the positioning mark. It is possible to reliably switch the film speed to a low speed in advance.

(Example) Next, an example of the present invention will be described using the drawings.

In the embodiment described below, the present invention is applied to a transfer film feed control device of a thermal transfer device.The transfer film 1 shown in FIG. 1 has the same structure as the transfer film C shown in FIG. Although not shown in the figure, a large number of transfer patterns are drawn on the film surface in a line at regular pitch intervals, and positioning marks 2 of a desired shape are also placed on the side of the film at regular pitch intervals. It is written in. The transfer film 1 is then fed in the direction of the arrow using the rotational force of the electric motor 3.

On the sides of the feeding path of the transfer film 1, photoelectric detection means 4 ₁ and 4 ₂ for detecting the positioning marks ₂ are arranged on the upstream side and the downstream side, respectively, with a required spacing L 2 . Photoelectric detection means 4 ₁ ,
₄₂ mark detection signals PH ₁ and PH ₂ are input to the film stop position control box 5.

Further, in addition to the start signal S ₁ instructing film feeding, an automatic feed signal S ₂ and an external timer signal S ₃ are selectively inputted to the film stop position control box 5 from the controller 6 that controls the thermal transfer device. . Among these, the automatic feed signal _S2 is used as a selection signal when the film is automatically fed by photoelectric detection of the positioning mark 2 described above (in other words, when the transfer film 1 having the positioning mark 2 is used). The external timer signal _S3 is input when the film advance is set from the controller 6 side (in other words, when a transfer film without positioning mark 2 is used)
This is input as the selection signal.

Further, the film stop position control box 5 is configured to output a motor drive signal (operation signal) _S4 and a film feed speed switching signal _S5 to a drive circuit 7 of the electric motor 3, and the drive circuit 7 outputs a motor drive signal S4 and a film feed speed switching signal S5. While ₄ is input, electric motor 3
At the same time, the film feed speed by the electric motor 3 is normally maintained at a high speed, and when the film feed speed switching signal _S5 is inputted, the film feed speed is switched to a low speed.

Next, the control circuit 8 in the film stop position control box 5 will be explained with reference to FIG.
It is composed of a logic circuit and has three input terminals 9: a start signal S ₁ , an automatic feed signal S ₂ , and an external timer signal S _3
1 to 9 ₃ and two input terminals 9 ₄ and 9 ₅ for mark detection signals PH ₁ and PH ₂ , and each of the above signals is inputted through an input interface 10. The control circuit 8 also has two output terminals 11 ₁ and 11 ₂ for a motor drive signal S ₄ and a film feed speed switching signal S ₅ , and these signals are transmitted through the output interface 12 to the drive circuit 7 as described above. is output to.

A flip-flop 13 is provided between the input interface 10 and the output interface 12, which uses the start signal _S1 as a set signal and outputs an output signal when an automatic feed signal _S2 or an external timer signal _S3 is input. The AND circuit 14 calculates the logical sum of the output signal of the flip-flop 13 and the output signal PH ₂ of the downstream photoelectric detection means 4 ₂ . It is assumed that the output signal PH ₂ of the downstream photoelectric detection means 4 ₂ is inverted by the inverter 15 and input to the AND circuit 14 .

The output signal of the AND circuit 13 is transmitted to the motor drive signal output terminal 1 through the output interface 12.
1 ₁ , and is used as one input of another AND circuit 16. The output signal PH ₁ of the upstream photoelectric detection means 4 ₁ is applied to the other input of the AND circuit 16 via the timer circuit 17 . This timer circuit 17 is composed of a CR circuit, and when the upstream photoelectric detection means 4 ₁ detects the positioning mark 2, it delays the detection signal PH ₁ for a required period of time.
It functions to input to the AND circuit 16. Further, the delay time by the timer circuit 17 is configured to be variable, and an adjustment volume 18 is provided on the outer surface of the film stop position control box 5 as shown in FIG. 1 so that the timer time can be easily adjusted from the outside. .

Furthermore, the output of the AND circuit 16 is sent to the film feed speed switching signal output terminal ₁₁₂ .

The circuit operation of this control circuit 8 is shown in FIGS. 3 and 4.
This will be explained using figures.

The time chart in FIG. 3 is an example of control in the case of automatic film feeding, and is a case where a transfer film provided with positioning marks 2 as shown in FIG. 1 is used. That is, when a start signal S ₁ and an automatic feed signal S ₂ are inputted from the controller 6, and automatic feeding of the transfer film 1 is selected and commanded, the flip-flop 13 is set and the flip-flop output is sent to the AND circuit 14.
In this AND circuit 14, the downstream photoelectric detection means 4 ₂
Since the positioning mark 2 has not been detected yet, there is no output (that is, 0 level), but since the inverter 15 is interposed, the input terminal of the AND circuit 14 is at 1 level, and the AND circuit 1
An output is generated at S4, which is sent to the motor drive signal output terminal 111, and is sent to the drive circuit _{7 as a motor drive signal S4 ,} so that the electric motor 3 is driven and the transfer film 1 is fed at high speed.

The output of the AND circuit 14 is also sent to the AND circuit 16, but the upstream photoelectric detection means 4 ₁ has not detected the positioning mark 2 yet, and this means 4 ₁
Since the input level from is 0, AND circuit 1
No output is generated at drive circuit 6, and therefore film feed speed switching signal _S5 is not output to drive circuit 7.
High speed feeding of the transfer film 1 is maintained.

When the upstream photoelectric detection means 4 ₁ first detects the positioning mark 2 by the above film feeding,
The mark detection signal PH ₁ is input to the control circuit 8, but this signal PH ₁ is delayed by the timer circuit 17. Therefore, the mark detection signal PH ₁ is not immediately input to the AND circuit 16, and the transfer film 1 continues to be fed at high speed. Then, the time t ₁ (third
(shown in the figure), the mark detection signal is delayed and input to the AND circuit 16.
An output is generated in the AND circuit 16, and as a result, a film feed speed switching signal _S5 is output from the output terminal ₁₁₂ .
is sent to the drive circuit 7, which activates a relay circuit in the drive circuit to switch the film feed speed to a low speed.

Next, while the transfer film 1 is being fed at this low speed, the same positioning mark 2 detected by the upstream photoelectric detection means 4 ₁ is detected by the downstream photoelectric detection means 4 ₂ . In that case, the mark detection signal PH ₂ is naturally 1
level, but is inverted to 0 level by passing it through the inverter 15, and therefore the AND circuit 1
4 disappears, and the output of the AND circuit 16 also disappears, the output of the motor drive signal _S4 and the film feed speed switching signal _S5 is stopped, the control circuit 8 is reset to the initial state, and the electric motor 3 is stopped, and the feeding of the transfer film 1 is also stopped.

The time chart in FIG. 4 is for thermal transfer using a transfer film without positioning marks 2, and a start signal _S1 and an external timer signal _S3 are input. While the external timer signal _S3 continues to be input, the flip-flop 13 outputs an output and sends the motor drive signal _S4 to the drive circuit 7 to drive the electric motor 3 to feed the transfer film at high speed, and outputs the external timer signal S3. disappears, the electric motor 3 is stopped. In this case, since the mark detection by the photoelectric detection means 4 ₁ and 4 ₂ is not relevant, the film feeding speed remains high from the start to the stop of feeding.

As described above, the timer circuit 17 is provided, and the upstream photoelectric detection means ₄₁ detects the positioning mark 2.
The detected signal PH ₁ is delayed for the required time.
Since it is input to the AND circuit 16,
By adjusting the delay time t ₁ according to the arrangement interval L ₂ of the photoelectric detection means 4 ₁ , 4 ₂ and delaying the timing of switching the transfer film 1 to low-speed feeding, the transfer film 1 can be moved at a low speed within this interval L ₂ . The feeding time _t2 can be shortened, and the loss in film feeding time within the interval _L2 can be reduced.

In addition, the control circuit 8 generates a motor drive signal _S4 and a film feed speed switching signal _S5 for the drive circuit 7 using AND circuits 14 and 16. For this reason, for example, the AND circuit 16
When the timer circuit 17 receives the delayed mark detection signal _PH1 , the film feed speed switching signal _S5 is sent to the drive circuit 7 in response to the input of the delayed mark detection signal PH1 from the timer circuit 17. In other words, the signal response is extremely good. Therefore, even if the timer circuit 17 is set to delay the mark detection signal PH ₁ until just before the positioning mark 2 reaches the downstream photoelectric detection means 4 ₂ , the low speed switching of the film speed is delayed until the positioning mark 2 reaches the downstream side photoelectric detection means 4 2 . This can be done reliably before reaching the side photoelectric detection means 4 ₂ , and the transfer film 1 can be fed at high speed to the limit within the distance L ₂ between the photoelectric detection means 4 ₁ and 4 ₂ . This further eliminates time loss, and even if the arrangement interval _L1 is long, the transfer film 1 can be efficiently fed.

Also, when the sieve feeding is stopped due to mark detection by the downstream photoelectric detection means ₄₂ , the mark detection signal is
Since the output of the AND circuit 14 can be turned off with good responsiveness at the same time as PH ₂ is generated, the transfer film 1 can be stopped with high precision.

(Effect of the invention) As is clear from the above description, since the present invention is provided with a timer that delays the output timing of the film deceleration signal, the arrangement interval between the upstream mark detection means and the downstream mark detection means is Even if the distance is set to be long, by delaying the film deceleration signal and shifting the deceleration switching timing, the transfer film can be fed at high speed through most of the above-mentioned arrangement interval, thereby increasing the distance between the mark detection means. It can be run without any time loss.

Moreover, the present invention uses an IC logic circuit as a circuit for creating a film deceleration signal when the upstream mark detection means detects a positioning mark.
The film deceleration signal can be generated in response to mark detection quickly and without variation. Therefore, even if the delay time by the timer is set to just before the downstream mark detection means detects the positioning mark, the film speed is quickly switched to low speed as soon as the time is up, so that the downstream mark detection means cannot detect the positioning mark. It is possible to reliably switch the film speed to a low speed in advance of the
Mark detection by the downstream mark detection means can be prevented when the film is being fed at high speed. This further eliminates time loss, enables high-speed feeding of the transfer film, and increases production efficiency.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a general schematic diagram of a transfer film feed control device, Fig. 2 is a control circuit diagram, Fig. 3 is a time chart during automatic film feed, and Fig. 4 is an external diagram. This is a time chart when the film is fed by a timer signal. FIG. 5 is a schematic diagram of a conventional transfer film feed control device. 1...Transfer film, 2...Positioning mark,
3...Electric motor, ₄₁ , ₄₂ ...Mark detection means (photoelectric detection means), 7...Drive circuit, 8...Control circuit, 13...Flip-flop, 14, 16
...AND circuit, 17...timer circuit.

Claims (1)

[Scope of utility model registration request] Positioning marks written at predetermined pitch intervals in the longitudinal direction of the transfer film are detected by two mark detection means disposed upstream and downstream in the film feeding direction, and the upstream mark detection means A transfer film feed control device that reduces the film feed speed by detecting a mark and stops the film feed by detecting the same mark by a downstream mark detection means, the transfer film feed speed being decelerated. A circuit for generating a deceleration signal and a stop signal for stopping the feed is configured with an IC logic circuit, and the output timing of the deceleration signal is determined from the time when the mark is detected by the upstream mark detection means to the time when the mark is detected by the downstream mark detection means. A transfer film feed control device characterized by having a timer for delaying the transfer film.