JP2006137437A - Mark fitting apparatus for ptp sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To drastically shorten a time required for adjusting mark fitting by facilitating to adjust a driving system and to set and change a sheet pitch during a film roll is renewed. <P>SOLUTION: In this mark fitting apparatus, a molding drum 2 and a seal drum 5 are respectively made to independent driving systems. Based on a pulse signal from an encoder 22 installed independently from the driving systems for these drums, lot information, and a mark position signal from a mark sensor 23, speeds of a molding drum driving motor 13 and a seal drum driving motor 14 are determined to synchronously control these driving motors. A reference position on a pocket film 3 side is set and a positional deviation of a registration mark to this reference position is detected. This positional deviation is corrected by controlling a phase of the molding drum driving motor, and controlling a braking force applied on a roller 30 with a brake for adjusting a tension provided in the midway of a cover film feeding system. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mark aligning device for a PTP sheet manufactured by a PTP machine.

  As shown in FIGS. 8 and 9, PTP, that is, press through packing, is generally performed by continuously heating a thermoplastic film by a heating roll 1 and a forming drum 2 as shown in FIGS. The pocket film 3 is formed, and each pocket 3a is filled with tablets, capsules, etc., the cover film 4 made of aluminum foil or the like is overlaid on the pocket 3a, and the gap between the seal drum 5 and the seal roll 6 is passed. 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. The registration mark is required to be displayed independently for each pocket 3a even if the pocket 3a portion is cut along the perforation 8. That is, when the cover film 4 is welded to the pocket film 3, the registration mark should not be on the perforation 8 and should be at the approximate center of the pocket 3 a.

  However, since the pocket film 3 and the cover film 4 are overlapped with each other so that wrinkles do not occur and are passed between the seal drum 5 and the seal roll 6, they expand and contract during the operation of the PTP machine. In many cases, the position of the pocket 3a and the position of the registration mark are not aligned.

  Therefore, conventionally, a single motor is used as a drive source for the molding drum 2 and the seal drum 5 that basically need to be synchronized, and the drums 2 and 5 and the drive motor are connected via a multistage gear mechanism. In addition, a detector having a cam plate that detects the sheet pitch of the pocket film 3 from the rotation of the drive motor is connected to a reduction gear on the output side of the drive motor via another gear mechanism, and further transmits power to the forming drum 2. A servomotor for adjusting the pocket film tension is arranged in the middle of the system via a differential gear device, and is based on the position of the registration mark detected by the mark sensor of the cover film 4 and the sheet pitch detected by the cam plate. Thus, the differential gear device prevents the generated torque from being transmitted to the seal drum 5 side through the power transmission system. , By controlling the rotation of the forming drum 2 side, and adjusting the tension of the pocket film 3, so as to align the positions of the registration marks of the pocket 3a (for example, Patent Document 1).

Japanese Patent Publication No. 2-60561

  However, in order to control the forming drum 2 and the seal drum 5 synchronously, a single drive motor is used and the drums 2 and 5 are connected via a multi-stage gear mechanism. The influence of rush was great, and a great deal of time was spent adjusting the drive system.

  In addition, since the detection of the sheet pitch is performed by a detector having a cam plate connected to the reduction gear on the drive motor output side through a gear mechanism, the influence of backlash is great, and the adjustment of the sheet pitch detection system is great. I was spending time. Furthermore, the adjustment between the seat pitch detection system and the drive system connected thereto is also affected by backlash, and a great amount of time is spent on the matching adjustment. Such a problem occurred every time the pocket film or cover film was updated after the roll was completed. Furthermore, when changing lots, it is necessary to change the gear ratio and cam plate according to the sheet pitch to be changed, and this adds the above-mentioned problems of backlash and matching adjustment. Was spending.

  Further, since the positional deviation between the pocket 3a and the registration mark is corrected only by adjusting the tension on the pocket film 3 side, it takes time until the pocket 3a and the registration mark are aligned, and the supply is made during that time. The wrapped packaging was wasted.

  Further, if the mark pitch of the cover film 4 is different even by 0.1 mm per sheet, this is accumulated in a short time as the cover film 4 is fed, resulting in a large shift. Control becomes difficult with the conventional method of correcting only by tension adjustment. Therefore, until now, it has only relied on the accuracy of the mark printing position, and the packaging material was wasted if it was not optimal pitch printing.

  The technical problem of the present invention is to make it possible to easily adjust the drive system at the time of updating the film roll and to set and change the sheet pitch, and to greatly reduce the time required for the mark alignment adjustment.

  The PTP sheet mark alignment apparatus according to claim 1 of the present invention has the following configuration. That is, a pocket of a pocket film formed with a forming drum is filled with tablets, capsules, etc., and is passed over a cover film made of metal foil printed with a registration mark and passed between a sealing drum and a sealing roll, and by heat welding. In a PTP machine that bonds the two together, a forming drum drive motor that drives the forming drum, a seal drum drive motor that drives the seal drum, a roller with a brake for tension adjustment provided in the middle of the cover film supply system, A mark sensor that detects the position of the registration mark printed on the cover film and outputs a mark position signal; and an encoder that is installed independently of the drive system of each drum and that rotates at a set speed and outputs a pulse signal Based on lot information, pulse signal from encoder and mark position signal from mark sensor The speeds of the forming drum drive motor and the seal drum drive motor are determined to control each of the drive motors synchronously, and a reference position on the pocket film side is set to detect a registration mark misalignment with respect to this reference position. And a control device that corrects the shift by controlling the phase of the forming drum drive motor and controlling the braking force applied to the roller with brake.

  In the PTP sheet mark aligning device according to claim 2, the control device controls the speed of each drive motor so that one sheet pitch is obtained by one rotation of the encoder.

  Further, in the mark aligning device for a PTP sheet according to claim 3, the control device has a counter, sets a plurality of mark detection positions before and after the reference position based on the lot information, and includes these reference positions. The pulse of the corresponding encoder position is set as the detection position, and the registration mark position with respect to the pocket film is determined by comparing the pulse signal of this encoder position with the mark position signal from the mark sensor.

  According to a fourth aspect of the present invention, there is provided a mark alignment apparatus for a PTP sheet, wherein an encoder position is previously set so that an actual reference position on a pocket film side in one lot matches a reference pulse position of an encoder position corresponding to the reference position. The position of the seal drum is adjusted, and the relative pulse position of other lots is set based on this.

  In the PTP sheet mark aligning apparatus according to claim 1, the forming drum and the seal drum are each independently driven, and a pulse signal from an encoder installed independently from the drive system of these drums, lot information, and a mark from a mark sensor. Based on the position signal, the speeds of the molding drum drive motor and the seal drum drive motor are determined and the respective drive motors are synchronously controlled, and the reference position on the pocket film side is set and the registration mark is shifted from the reference position. This positional shift is corrected by controlling the phase of the molding drum drive motor and controlling the braking force applied to the tension-adjusting brake roller provided in the middle of the cover film supply system. Therefore, the problem of backlash in the drive system and seat pitch detection system is almost solved. Is, adjustment of the drive system during the film roll updating, setting of the seat pitch, becomes easily changed, control is facilitated. For this reason, it is possible to greatly reduce the time until the mark position matches, and to suppress the amount of wasted sheets (defective products).

  In the PTP sheet mark aligning apparatus according to claim 2, since the control device controls the speed of each drive motor so that one sheet pitch is obtained by one rotation of the encoder, the lot pitch is changed according to the sheet pitch to be changed. Thus, there is no need to change the gear ratio or replace the cam plate as in the conventional case, and the effect of eliminating the above-described backlash and matching adjustment problems is added to this, so that the lot switching time can be greatly shortened.

  Further, in the mark aligning device for a PTP sheet according to claim 3, the control device has a counter, sets a plurality of mark detection positions before and after the reference position based on the lot information, and includes these reference positions. Since the pulse of the corresponding encoder position is set as the detection position, and the pulse signal of this encoder position is compared with the mark position signal from the mark sensor, the registration mark position with respect to the pocket film is judged. Therefore, it is possible to detect the misalignment of the registration mark with respect to the reference position with high accuracy.

  In the PTP sheet mark aligning apparatus according to claim 4, the position of the encoder is previously set so that the actual reference position on the pocket film side in one lot matches the reference pulse position of the encoder position corresponding thereto. The position of the seal drum is adjusted, and the relative pulse position of other lots is set based on this position. Therefore, when switching lots, the lot information (pulse position) is input to the controller. The pulse position changes according to the sheet pitch to be changed, the reference position of the sheet matches the reference pulse position of the corresponding encoder position, and the registration mark misalignment with respect to the reference position of the sheet is detected. It becomes possible to do.

  The PTP sheet mark aligning device of the present invention will be described below based on the illustrated embodiment. FIG. 1 is a configuration diagram showing a mark aligning device for a PTP sheet according to an embodiment of the present invention, and FIG. 2 is a print example of a cover film mark pitch used in the device of the present embodiment (before applying a voltage to a powder brake). 3 is an explanatory diagram showing the relative positional relationship between the registration mark and the pocket when the lowest voltage is applied to the powder brake, and FIG. 4 is an illustration showing the registration mark and the pocket when the reference voltage is applied to the powder brake. FIG. 5 is an explanatory diagram showing the relative positional relationship between the registration mark and the pocket when the maximum voltage is applied to the powder brake, and FIG. 6 is a registration mark after adjusting the tension of the pocket film and the cover film. FIG. 7 is an explanatory view showing the relative positional relationship between the pockets, and FIG. 7 is an explanatory view of the operation of the apparatus according to the present embodiment. That. In the description, reference is made to FIG.

  The PTP sheet mark aligning apparatus of this embodiment forms a pocket film 3 having a large number of pockets 3a by continuously heating a thermoplastic film with a heating roll 1 and a forming drum 2 as shown in FIG. , Each pocket 3a is filled with tablets, capsules, etc., and a cover film 4 made of a metal foil (for example, aluminum foil) printed with a registration mark is stacked thereon and passed between the seal drum 5 and the seal roll 6; Both are thermally bonded 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 before. The apparatus according to the present embodiment is different from conventional methods in the drive system of the forming drum 2 and the seal drum 5, the sheet pitch detection system, and the alignment and adjustment methods of the position of the pocket 3a and the position of the registration mark m.

  That is, in the apparatus of the present embodiment, dedicated drive motors (for example, servo motors) in which the drive systems of the forming drum 2 and the seal drum 5 are coupled to the respective drums via the rotation transmission mechanisms 11 and 12 between the orthogonal axes, respectively. 13 and 14. Here, the rotation transmission mechanisms 11 and 12 are used to compress the width direction dimensions of the apparatus of the present embodiment by causing the drive motors 13 and 14 to be directed in the line direction, and are not a speed reduction mechanism but 1: 1. The gear ratio is set. That is, the forming drum 2 and the seal drum 5 are basically operated by direct drive.

  The sheet pitch detection system is installed independently without being connected to the drive systems of the forming drum 2 and the seal drum 5 so as not to be influenced by the tension fluctuation of the pocket film 3. That is, it has an inverter motor 21 that rotates at a speed set by an external input, and an encoder 22 that rotates by the inverter motor 21 and outputs a pulse signal (4096 pulse transmission in one rotation). The encoder is previously set so that the actual reference position on the pocket film 3 side (for example, the position of 0 in FIG. 7) matches the reference pulse position of the encoder position corresponding to the position (for example, the position of the pulse 4096 in FIG. 7). The position of 22 and the position of the seal drum 5 are adjusted, and relative encoder position pulses (hereinafter referred to as pulse positions) of other lots having different sheet pitches are set based on this position. Yes. Then, the speed of each of the drive motors 13 and 14 is adjusted by a control device 31 described later so that one sheet pitch is obtained by one rotation of the encoder (4096 pulses = 360 °) based on lot information (pulse position corresponding to the sheet pitch). To be controlled. In other words, the speed of the entire apparatus is determined according to the speed value set by external input to the inverter motor 21 of the sheet pitch detection system that is installed independently from the drive systems of the forming drum 2 and the seal drum 5.

  Matching and adjustment of the position of the pocket 3a and the registration mark are also performed by the control device 31 together with the speed control. That is, the control device 31 includes a counter 32, a speed calculation unit 33, a mark position determination unit 34, a motor operation mode switching unit 35, and a brake operation mode switching unit 36. Based on the pulse signal and the mark position signal from the mark sensor 23 provided in the middle of the cover film supply system, the speeds of the drive motor 13 for the molding drum 2 and the drive motor 14 for the seal drum 5 are determined to determine the respective drive motors 13, 14 is synchronously controlled, a reference position on the pocket film 3 side is set, a registration mark position shift relative to the reference position is detected, and the drive motor 13 of the molding drum 2 is phase-controlled and this position shift is covered. Roller with brake for tension adjustment provided in the middle of the film supply system (for example, rubber roller with powder brake) And a function of correcting by controlling the braking force (applied voltage) applied to 30.

  More specifically, the counter 32 repeatedly counts the pulse signal sent from the encoder 22 (4096 pulse transmission per rotation) from 0 every rotation, and the count value is determined by the speed calculation means 33 and the mark position determination. Each means 34 has a function of inputting.

  The speed calculation means 33 has a function of calculating the speeds of the drive motors 13 and 14 so that one sheet pitch is obtained by one rotation of the encoder from the lot information and the interval between the transmission pulses of the encoder 22, that is, the count speed of the counter 32. .

  Based on the count value sent from the counter 32 and lot information, the mark position determination means 34 has a plurality of mark detection positions A before and after the reference position (0 point position in FIG. 7) on the pocket film 3 side. , B, C, D, and the mark detection positions A, B, C, D including the reference position, the pulse of the corresponding encoder position, that is, the count value of the counter 32, for example, the reference position is 4096 pulses, the position A is set to 4000 pulses, position B is set to 100 pulses, position C is set to 200 pulses, position D is set to 2000 pulses, and the pulse signal from the encoder 22, that is, the count value of the counter 32 is compared with the mark position signal from the mark sensor 23. By doing so, the position of the registration mark m (see FIG. 4) is changed to the pocket film 3. Determines the mark detection position A, B, C, or at position D throat (region), it has a function of detecting the positional deviation of the registration mark m with respect to the reference position of the pocket film 3 side.

The motor operation mode switching means 35 synchronously controls the drive motors 13 and 14 based on the speed calculated by the speed calculation means 33, and based on the determination result of the mark position determination means 34, that is, the drive motor 13. The tension of the pocket film 3 is adjusted by changing the phase state on only the side in three stages (non-adjustment operation mode, fine adjustment operation mode, and coarse adjustment operation mode), and the registration mark m with respect to the reference position on the pocket film 3 side is adjusted. It has a function of correcting the positional deviation and matching one sheet pitch of the pocket film 3 to the mark pitch of the cover film 4.
Here, the non-adjustment operation mode refers to a state in which the pocket film 3 is operated with a basic tension applied.
Further, the fine adjustment operation mode is instantaneous adjustment, and refers to a state in which the tension of the pocket film 3 is slightly increased from the basic tension (an amount in which one sheet pitch of the pocket film 3 is larger than the mark pitch of the cover film 4). .
The coarse adjustment operation mode refers to a state in which the tension of the pocket film 3 is increased more than the basic tension (as much as possible).

The brake operation mode switching means 36 has three levels of braking force (applied voltage) applied to the brake roller 30 based on the determination result of the mark position determination means 34 (reference voltage operation mode, minimum voltage operation mode, maximum voltage operation mode). To adjust the tension of the cover film 4, correct the misalignment of the registration mark m with respect to the reference position on the pocket film 3 side, and adjust the mark pitch of the cover film 4 to one sheet pitch of the pocket film 3. It has a function.
Here, the reference voltage operation mode is such that the reference voltage is applied to the powder brake of the roller 30 with brake and the mark pitch of the cover film 4 is slightly larger than one sheet pitch of the pocket film 3 as shown in FIG. A state in which the cover film 4 is operated with tension applied.
Further, the minimum voltage operation mode means that the minimum voltage is applied to the powder brake of the roller 30 with brake and the tension of the cover film 4 is made as small as possible from the basic tension, and the mark pitch of the cover film 4 as shown in FIG. Is a state of driving with tension applied to the cover film 4 so as to be smaller than one sheet pitch of the pocket film 3.
Further, the maximum voltage operation mode means that the maximum voltage is applied to the powder brake of the roller 30 with brake, and the tension of the cover film 4 is increased as much as possible from the basic tension, and the mark pitch of the cover film 4 as shown in FIG. Is a state in which the cover film 4 is operated with tension so that is larger than one sheet pitch of the pocket film 3.

  In addition, the codes | symbols 4A and 4B in FIG. 1 have shown the film roll of the cover film 4, and it has described so that the cover films 4 and 4 may be pulled out simultaneously from both film rolls 4A and 4B. However, in order to make it possible to visually understand the feeding path from each of the film rolls 4A and 4B, it is described as such for convenience, and one film roll is a preliminary roll.

  By the way, in the mark alignment control of the PTP sheet, the tension applied to the pocket film 3 and the cover film 4 and the accompanying mark pitch are important. As described above, the pocket film 3 and the cover film 4 are each tensioned so as not to cause wrinkles, and the tension cannot be relaxed. Accordingly, both the basic tension applied to the pocket film 3 in the non-adjustment operation mode and the tension applied to the cover film 4 in the minimum voltage operation mode are set so that the tension is higher than the wrinkle generation prevention tension.

  Further, the pitch of the registration mark m accompanying the tension of the cover film 4 generated in the reference voltage operation mode is slightly longer than the feed pitch of the seal drum 5, that is, one sheet pitch of the pocket film 3, and the cover film 4 side is operated with the reference voltage. Mode, and when the pocket film 3 side is in the non-adjustment operation mode, the position of the registration mark m is gradually shifted backward in the traveling direction with respect to the position of the pocket 3a of the pocket film 3 as shown in FIG. ing. Then, the tension on the cover film 4 side can be adjusted by adjusting the tension below the basic tension on the cover film 4 side (operation in the lowest voltage operation mode) and suppressing the stretching amount on the cover film 4 side as much as possible. The position of the registration mark m and the position of the pocket 3a can be aligned as shown in FIG. 6 by reducing the mark pitch of the cover film 4 to be as small as possible from the one sheet pitch of the pocket film 3. Like that. Alternatively, the pocket film 3 side can be stretched to the extent possible with respect to the cover film 4 by adjusting the tension with a force equal to or higher than the basic tension on the pocket film 3 side (operation in the fine adjustment operation mode or the coarse adjustment operation mode) As shown in FIG. 6, the position of the registration mark m and the position of the pocket 3a can be aligned. Furthermore, by adjusting the tension of both the pocket film 3 and the cover film 4 so as to cooperate with each other, the registration mark m and the pocket 3a can be aligned with each other as shown in FIG. .

  In addition, when the mark pitch of the cover film 4 is greatly deviated forward with respect to the position of the pocket 3a, the cover film 4 is adjusted to a tension higher than the basic tension on the cover film 4 side (operation in the maximum voltage operation mode). 5, the stretching amount on the cover film 4 side is increased as much as possible, and the mark pitch of the cover film 4 is increased as much as possible than the one sheet pitch of the pocket film 3. The position of the mark m and the position of the pocket 3a can be aligned.

  Next, the operation of the PTP sheet mark aligning apparatus according to the present embodiment will be described with reference to FIGS. First, when lot information is input to the control device 31 and the speed is set to the inverter motor 21 of the encoder 22, the reference position on the pocket film 3 side (the zero point position in FIG. 7) and the mark detection positions A and B , C and D, the encoder position pulse, that is, the count value of the counter 32 is set. Here, it is assumed that the reference position is set to 4096 pulses, position A is set to 4000 pulses, position B is set to 100 pulses, position C is set to 200 pulses, and position D is set to 2000 pulses. A reference voltage is applied to the powder brake of the roller 30 with brake. That is, the reference voltage operation mode is set as an initial setting. Next, based on the rotational speed of the encoder 22, the drive motors 13 and 14 are both driven at a speed such that one sheet pitch is obtained by one rotation of the encoder, and synchronous control is performed. Then, the pulse signal from the encoder 22, that is, the count value of the counter 32 is compared with the mark position signal from the mark sensor 23, and the registration mark position is any of the mark detection positions A, B, C, D on the pocket film 3 side. It is determined whether it is in the position (area), the displacement of the registration mark m with respect to the reference position on the pocket film 3 side is detected, and the phase state of the molding drum 2 is changed in three stages according to the following four conditions. The tension of the pocket film 3 is adjusted, and the braking force (applied voltage) applied to the brake roller 30 is changed in three stages to adjust the tension of the cover film 4, or the phase control of the molding drum 2 and the brake The position of the registration mark m with respect to the reference position on the pocket film 3 side by cooperation of the braking force control of the roller 30 The deviation is corrected.

Condition 1
When the position of the registration mark m on the cover film 4 is within the range of the boundary A-B, it is within the OK range, so the molding drum 2 remains in the state A (no adjustment: basic tension) and the roller 30 with brake is used. The braking force (applied voltage) applied to is kept in the state D (reference voltage: basic tension). In this case, the position of the registration mark m on the cover film 4 gradually shifts backward in the traveling direction with respect to the pocket film 3 (see FIG. 4).

Condition 2
When the position of the registration mark m of the cover film 4 is within the range of the boundary BC, it is within the OK range, but the molding drum 2 remains in the state (no adjustment: basic tension) and the roller 30 with brake is used. However, if the state D (reference voltage: basic tension) remains outside the OK range, the brake roller 30 side remains in the state D and only the forming drum 2 side is in the state b (fine adjustment: slightly tensioned from the basic tension). Thus, it is prevented from going out of the OK range (see FIG. 6).

Condition 3
When the detection position of the registration mark m on the cover film 4 is in the range of the boundary CD, it is out of the OK range, so the molding drum 2 side is in the state C (coarse adjustment: tension more than the basic tension), and the roller with brake On the 30th side, the state is (minimum voltage: tension is less than the basic tension). Thereby, the position of the registration mark m of the cover film 4 gradually shifts forward in the direction of travel with respect to the pocket film 3 (see FIG. 3), and the pocket film 3 advances with respect to the cover film 4 so as to promote this. It gradually shifts backward in the direction. That is, as a result, the detection position of the registration mark m on the cover film 4 falls within the OK range, and the state shown in FIG. 6 is obtained.

Condition 4
When the detection position of the registration mark m on the cover film 4 is in the range of the boundary AD, it is out of the OK range, but unlike the case of the above condition 3, the molding drum 2 side is in the state a (no adjustment: basic tension), and The roller 30 with brake is in a state (maximum voltage: more than the basic tension). Thereby, the detection position of the registration mark m on the cover film 4 gradually shifts backward in the traveling direction with respect to the pocket film 3 (see FIG. 5). That is, as a result, the detection position of the registration mark m on the cover film 4 falls within the OK range so that the state shown in FIG. 6 is obtained.

  As described above, in the mark aligning device for the PTP sheet of this embodiment, the forming drum 2 and the seal drum 5 are each independently driven, and the pulses from the encoder 22 installed independently from the drive systems of these drums 2 and 5 are provided. Based on the signal, the lot information, and the mark position signal from the mark sensor 23, the speeds of the forming drum drive motor 13 and the seal drum drive motor 14 are determined and the drive motors 13 and 14 are synchronously controlled. A reference position on the side is set to detect a position shift of the registration mark m with respect to the reference position, and this position shift is phase-controlled by the molding drum drive motor 13 and tension adjustment provided in the middle of the supply system of the cover film 4 Because the correction is made by controlling the braking force applied to the roller 30 with brake for use, Dynamic system and backlash problems in sheet pitch detection system is substantially eliminated, the film roll 4A, adjustment of the drive system during 4B update settings sheet pitch becomes easy change, control is facilitated. For this reason, it is possible to greatly reduce the time until the mark position matches, and to suppress the amount of wasted sheets (defective products).

  Further, since the control device 31 controls the speeds of the drive motors 13 and 14 so that one sheet pitch is obtained by one rotation of the encoder, the gear ratio is changed in accordance with the sheet pitch to be changed at the time of lot switching. It is not necessary to replace the cam plate or the cam plate, and the effect of eliminating the above-described backlash and matching adjustment problems is added to this, so that the lot switching time can be greatly shortened.

  Further, the control device 31 has a counter 32, sets a plurality of mark detection positions A, B, C, and D before and after the reference position based on the lot information, and includes these mark detection positions A and B including the reference position. The pulse of the corresponding encoder position is set in B, C, and D, and the position of the registration mark m with respect to the pocket film 3 is determined by comparing the pulse signal of this encoder position with the mark position signal from the mark sensor 23. As a result, the misalignment of the registration mark m with respect to the reference position can be detected with high accuracy.

  Further, the position of the encoder 22 and the position of the seal drum 5 are adjusted in advance so that the actual reference position on the pocket film side in one lot matches the reference pulse position of the encoder position corresponding thereto. Since the relative pulse position of other lots is set based on this, the lot information (pulse position) is simply input to the control device 31 at the time of lot switching to match the sheet pitch to be changed. Thus, the pulse position is switched, the reference position of the sheet matches the reference pulse position of the encoder position corresponding to the sheet position, and the displacement of the registration mark m with respect to the reference position of the sheet can be detected.

It is a block diagram of one Embodiment apparatus of this invention. It is explanatory drawing of the example of printing of the cover film mark pitch used with this embodiment apparatus. It is explanatory drawing which shows the relative positional relationship of a registration mark and a pocket when the minimum voltage is applied to the powder brake by this embodiment apparatus. It is explanatory drawing which shows the relative positional relationship of a registration mark and a pocket when a reference voltage is applied to the powder brake by this embodiment apparatus. It is explanatory drawing which shows the relative positional relationship of a registration mark and a pocket when the highest voltage is applied to the powder brake by this embodiment apparatus. It is explanatory drawing which shows the relative positional relationship of the registration mark and pocket after the pocket film and cover film tension adjustment by this embodiment apparatus. It is explanatory drawing of operation | movement of this embodiment apparatus. 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

2 Molding drum 3 Pocket film 3a Pocket m Registration mark 4 Cover film 5 Seal drum 6 Seal roll 13 Molding drum drive motor 14 Sealing drum drive motor 21 Inverter motor 22 Encoder 23 Mark sensor 30 Roller with brake 31 Controller 32 Counter A, B , C, D Mark detection position

Claims (4)

The pocket of the pocket film molded with the molding drum is filled with tablets, capsules, etc., and is overlapped with the cover film made of metal foil printed with registration marks and passed between the sealing drum and the sealing roll, and both are bonded by thermal welding. In a PTP machine that bonds together,
A molding drum drive motor for driving the molding drum;
A seal drum drive motor for driving the seal drum;
A roller with a brake for tension adjustment provided in the middle of the supply system of the cover film;
A mark sensor for detecting a position of a registration mark printed on the cover film and outputting a mark position signal;
An encoder that is installed independently of the drive system of each of the drums, rotates at a set speed, and outputs a pulse signal;
Based on the lot information, the pulse signal from the encoder, and the mark position signal from the mark sensor, the speeds of the molding drum drive motor and the seal drum drive motor are determined to control each of the drive motors synchronously. By setting a reference position on the film side and detecting a displacement of the registration mark with respect to the reference position, this positional displacement is controlled by controlling the phase of the molding drum drive motor and the braking force applied to the brake roller. A control device to correct,
A mark alignment apparatus for a PTP sheet, comprising:   2. The PTP sheet mark aligning apparatus according to claim 1, wherein the controller controls the speed of each of the drive motors so that one sheet pitch is obtained by one rotation of the encoder.   The control device has a counter, sets a plurality of mark detection positions before and after the reference position based on lot information, and sets pulses of encoder positions corresponding to the mark detection positions including the reference position 3. The PTP sheet according to claim 1, wherein a position of the registration mark relative to the pocket film is determined by comparing a pulse signal of the encoder position with a mark position signal from the mark sensor. Mark alignment device. The encoder position and seal drum position are adjusted in advance so that the actual reference position on the pocket film side in one of the lots matches the reference pulse position of the encoder position corresponding to it. 4. The PTP sheet mark aligning device according to claim 1, wherein a relative pulse position of another lot is set.

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