JP3969495B2 - Cover film constant tension feeding device for PTP machine - Google Patents

Description

  The present invention relates to a cover film constant tension feeding device for a PTP machine in which an intermittent operation type printing machine having a buffer function is arranged in the middle of a cover film continuous conveyance line.

  In general, PTP, that is, press-through packing, is a method in which a thermoplastic film is continuously heated by a heating roll 1 and a forming drum 2 as shown in FIGS. Pocket film 3 is formed, and each pocket 3a is filled with tablets, capsules, etc., and a cover film 4 made of aluminum foil or the like is overlaid on the pocket 3a and passed between the seal drum 5 and the seal roll 6, A packaging method in which heat bonding is performed is referred to, and a sheet obtained thereby is referred to as a PTP sheet 7. The PTP sheet 7 thus obtained is cut into a predetermined size to form individual sheets, and further, perforations 8 are provided so that the peripheral portions of the individual pockets 3a filled with tablets, capsules and the like can be easily cut. Is put.

  By the way, in such a PTP sheet 7, a trademark called a registration mark, a chemical symbol, a company name, and the like are often printed on the front surface, back surface, or front and back surfaces of the cover film 4. In recent years, there is an increasing demand for additional printing of, for example, a lot number or the like on a part of a cover film on which a plain cover film or a registration mark is printed, using a printing machine provided in the middle of the cover film conveyance line. The registration mark and lot number must be printed on the sheet by subsequent mark control. That is, even if the pocket 3a portion is cut along the perforation 8, it is required to be displayed independently for each pocket 3a. That is, when the cover film 4 is welded to the pocket film 3, the registration mark and lot number should not be on the perforation 8 and should be in the approximate center of the pocket 3 a.

  Therefore, conventionally, by making the feeding speed of one cover film 4 constant, the tension of the cover film 4 is made constant, and by adjusting the tension of the other pocket film 3, the position of the pocket 3a and the position of the registration mark are made. (For example, Patent Document 1).

Japanese Patent Publication No. 2-60561

  As described above, the cover film 4 is made of aluminum foil or the like. For this reason, fixing is not easy with ordinary ink. Therefore, printing is performed using UV ink (ultraviolet curable ink), and fixing is performed by ultraviolet irradiation. However, in this case, after printing, it is necessary to irradiate ultraviolet rays for a certain period of time until the UV ink is cured, and during that time, the conveyance of the cover film 4 must be stopped. On the other hand, in this type of PTP machine, the cover film 4 and the pocket film 3 are generally conveyed continuously. Therefore, the intermittent operation type printing machine using UV ink is provided with a buffer function for maintaining a gap between the cover film continuous conveyance line, that is, a function capable of temporarily storing a predetermined amount of a cover film after additional printing. . However, this buffer function becomes a major disturbance factor in the subsequent control of the cover film tension, and the conventional system in which the feed speed of the cover film is made constant cannot make the cover film tension constant.

  The technical problem of the present invention is that even if an intermittent operation type printing machine having a buffer function is arranged in the middle of the cover film continuous conveyance line, the subsequent constant tension control can be stably performed. It is in.

  The cover film constant tension feeding device for a PTP machine according to claim 1 of the present invention has the following configuration. In other words, an intermittent operation type printing machine with a buffer function is arranged in the middle of the cover film continuous conveyance line, and the pocket film filled with tablets, capsules, etc. and the cover film fed out from the intermittent operation type printing machine are stacked and heat-welded. In a PTP machine that bonds the two together, a swing roller that feeds the cover film from the intermittent operation type printing machine, a drive motor that drives the feed roller, and a swingable swing that is always biased by the biasing means. Based on a tension roller that is attached to the free end of the arm and applies tension to the cover film that has passed through the feeding roller, an angle sensor that outputs a signal according to the swing angle of the swing arm, and a signal from the angle sensor By controlling the speed of the drive motor so that the swing arm is held at a predetermined angle, A tension control device for the tension to be applied to bar the film is controlled to be constant, but with a.

  In the cover film constant tension feeding device of the PTP machine according to claim 1, the speed of the driving motor of the feeding roller is controlled so that the swing arm constantly biased by the biasing means is held at a predetermined angle. The tension of the cover film is constant.

  The cover film constant tension feeding device of the PTP machine of the present invention will be described below based on the illustrated embodiment. FIG. 1 is a block diagram showing a cover film constant tension feeding device for a PTP machine according to an embodiment of the present invention. In FIG. In the description, reference is made to FIG.

The cover film constant tension feeding device of the PTP machine of this embodiment is a pocket film 3 having a large number of pockets 3a by continuously heating a thermoplastic film by a heating roll 1 and a forming drum 2 as shown in FIG. The pocket 3a is filled with tablets, capsules, etc., and a cover film 4 made of, for example, aluminum foil on which registration marks are printed is overlaid and passed between the seal drum 5 and the seal roll 6, Is bonded by heat to obtain a PTP sheet 7. The PTP sheet 7 thus obtained is cut into a predetermined size to form individual sheets, and further, perforations 8 are provided so that the peripheral portions of the individual pockets 3a filled with tablets, capsules and the like can be easily cut. Is put. This basic flow is the same as that of the conventional example (FIG. 2).
In this embodiment, the intermittent operation type printing machine 11 for additional printing having a buffer function is arranged in the middle of the cover film continuous conveyance line, and is arranged on the outlet side of the printing machine 11 in the cover film continuous conveyance line. The feeding roller 17 is driven by a drive motor (for example, a servo motor) 16, and the swinging swing is always urged downward (clockwise) by an urging means (not shown). An angle sensor that is attached to the free end of the arm 18 and that provides a tension roller 19 that applies tension to the cover film 4 that has passed through the feeding roller 17, and that outputs a signal according to the swing angle of the swing arm 18. That is, based on the point where the encoder 21 is provided and the signal from the encoder 21, the swing arm 18 is moved to a predetermined angle (here, swing-in). A tension control device 31 for controlling the tension applied to the cover film 4 to be constant by controlling the speed of the drive motor 16 of the feed roller 17 so that the drum 18 is held at a horizontal angle). This is different from the conventional example (FIG. 2) described above.

  More specifically, the intermittent operation type printing machine 11 moves the position left and right while conveying the transfer roll 12 using UV ink (ultraviolet curable ink), the ultraviolet irradiation unit 13 and the cover film 4 as ink. By sliding, a cover roller 4 having a buffer function for temporarily storing a predetermined amount of the cover film 4 that has been additionally printed while being temporarily stored, and a slide roller 14 that is disposed so as to face the slide roller 14 are slid left and right. And a drawing roller 15 that draws a predetermined amount of the cover film 4 before additional printing from the film roll 4A or 4B (one is a preliminary roller).

  The urging means for urging the swing arm 18 in the clockwise direction is, for example, a torsion spring provided on the swinging central shaft portion of the swing arm 18 or a tension spring stretched between the swing arm 18 and the machine frame. Thus, the stored force changes according to the swing angle of the swing arm 18.

  Based on the pulse signal from the encoder 21, the tension control device 31 includes an arm angle determination unit 32 that determines the angle of the swing arm 18, a set speed value (initial value), an arm angle, and an arm angle determination unit 32. The feed speed at which the speed of the drive motor 16 of the feed roller 17 is feedback-controlled so that the actual arm angle becomes the set arm angle (for example, the angle at which the swing arm 18 becomes horizontal as shown in FIG. 1) When the actual arm angle is smaller than the set arm angle (a state in which the arm is swung in a counterclockwise direction from the horizontal position in FIG. 1), the stored energy of the urging unit Since the tension is increased and the tension is increased, the arm angle is increased by increasing the speed of the drive motor 16 and increasing the feeding amount by the feeding roller 17. Greatly, thereby controlling to decrease the energy-storing force of the biasing means. Further, when the actual arm angle is larger than the set arm angle (a state in which the arm is swung in the clockwise direction from the horizontal position in FIG. 1), the stored force of the urging means becomes small and the tension is low. Therefore, the speed of the drive motor 16 is slowed down, the feed amount by the feed roller 17 is reduced, the arm angle is reduced, and thereby the energy storage force of the biasing means is increased. .

  1 is a mark sensor arranged in front of the tension roller 19 in the cover film conveyance line in the film traveling direction, and the registration mark printed or additionally printed on the cover film 4 by the mark sensor 22. The position of the lot number is detected, and the registration mark or lot number position of the cover film 4 and the position of the pocket 3a of the pocket film 3 are aligned by the subsequent mark control.

  As described above, in the cover film constant tension feeding device of the PTP machine of this embodiment, the speed of the driving motor 16 of the feeding roller 17 so that the swing arm 18 constantly biased by the biasing means is held at a predetermined angle. Therefore, the tension of the cover film 4 thereafter can be kept constant. For this reason, the position of the registration mark or lot number of the cover film 4 is detected by the mark sensor 22 under the same conditions, and the subsequent mark control is stabilized.

It is a block diagram of one Embodiment apparatus of this invention. It is operation | movement explanatory drawing of the conventional PTP machine. It is the top view and side view which show an example of a PTP sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Pocket film 4 Cover film 11 Intermittent operation type printing machine 16 Drive motor 17 Feeding roller 18 Swing arm 19 Tension roller 21 Encoder (angle sensor)
31 Tension control device

Claims (1)

An intermittent operation type printing machine having a buffer function is arranged in the middle of the cover film continuous conveyance line, and a pocket film filled with tablets, capsules, etc. and a cover film fed out from the intermittent operation type printing machine are overlapped by heat welding. In a PTP machine that bonds both together,
A payout roller for paying out the cover film from the intermittent operation type printing press;
A drive motor for driving the feeding roller;
A tension roller that is attached to a free end of a swingable swing arm that is constantly biased by a biasing means and applies tension to the cover film that has passed through the feeding roller, and a swing angle of the swing arm An angle sensor that outputs signals,
Tension control for controlling the tension applied to the cover film to be constant by controlling the speed of the drive motor so that the swing arm is held at a predetermined angle based on a signal from the angle sensor. Equipment,
A cover film constant tension feeding device for a PTP machine.

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