JP4354900B2 - Position adjusting apparatus and PTP sheet manufacturing apparatus - Google Patents

Description

  The present invention relates to a technique for manufacturing a PTP sheet in which a tablet is accommodated in a pocket portion formed in a packaging film and a cover film is attached in a sealed state so as to close the pocket portion. The present invention relates to a position adjusting device that performs position adjustment when attaching and a PTP sheet manufacturing apparatus including the position adjusting device.

  In general, a PTP sheet is attached to a packaging film made of resin in which a pocket portion filled with tablets or the like is formed, and the packaging film so that the opening side of the pocket portion is sealed to the packaging film. It is comprised from the cover film made from aluminum.

  Such a cover film may be provided with symbols such as character information and code information. For example, when the cover film is attached to the packaging film so that the symbols are in appropriate positions in units of sheets, the cover film There is known a technique for adjusting the position of (see, for example, Patent Document 1).

In the technique described in this document, a pair of rollers having different diameters are provided, and a cover film is conveyed by driving a downstream roller having a relatively large diameter. And when the shift | offset | difference of the cover film with respect to the packaging film becomes more than fixed, the upstream roller with a relatively small diameter is driven via a clutch that can be selectively engaged and released. Thereby, since a cover film is partially extended and the position of a cover film is adjusted, it can prevent that the shift | offset | difference of a cover film becomes large too much.
JP 60-82558 A

  However, in the above technique, since the cover film is stretched only after the displacement of the cover film becomes a certain level or more, it cannot be said that the accuracy of the position adjustment of the cover film is sufficient. Moreover, it is a technique through a clutch, and the cover film is partially stretched such that one part of the cover film is stretched and another part is not stretched. In addition, the stretching is performed based on the difference in the diameters of the rollers, and the stretching can be performed only at a certain rate. Therefore, the cover film may be broken during stretching.

  The present invention has been made in order to solve the above-described problems, and its purpose is to stretch the cover film so as not to cause breakage of the cover film, and to apply the design attached to the cover film to the packaging film. The purpose of this is to adjust the position of the cover film so as to match the predetermined position with high accuracy.

  In the following, each means suitable for solving the above-mentioned purpose will be described in terms of items. In addition, the effect etc. peculiar to the means to respond | correspond as needed are added.

Means 1. An attachment position of the cover film by a sealing means for attaching the cover film in a sealed state so as to close the pocket portion with respect to the packaging film containing the tablet in the pocket portion is attached to the cover film. A position adjusting device for adjusting the design so that the pattern comes to a predetermined position of the packaging film,
A pair of rollers for stretching the cover film;
Detection means for detecting the magnitude of displacement of the cover film with respect to the packaging film;
A stretching control means capable of adjusting the rotational speed of at least one of the rollers and stretching the cover film;
The position adjusting device, wherein the stretching control unit is configured to adjust a rotation speed of the roller so as to stretch the cover film in accordance with the deviation detected by the detecting unit.

  The position adjusting device described in the means 1 adjusts the attachment position of the cover film by the sealing means so that the pattern attached to the cover film is at a predetermined position of the packaging film.

  Here, in particular, the detection means detects the magnitude of the shift of the cover film with respect to the packaging film, and the rotation control means adjusts the rotation speed of the roller to stretch the cover film according to the detected shift. The

  The technical idea of the present invention is to grasp the displacement of the cover film as an amount, and to stretch the cover film according to the displacement. That is, the greater the displacement, the greater the stretch amount of the cover film, and the smaller the displacement, the smaller the stretch amount of the cover film.

  If it does in this way, unlike the conventional structure, since the extending | stretching amount of a cover film does not change rapidly, a cover film can be extended so that the fracture | rupture of a cover film may not be produced. Moreover, since a cover film is extended according to a shift | offset | difference generate | occur | produced, the design attached | subjected to the cover film can be match | combined with the high precision to the predetermined position of the film for packaging.

  In addition, the shift | offset | difference of a cover film can be detected by acquiring the position of the cover film conveyed. The position of the cover film can be grasped as the degree of progress in the movement path in relation to the attached pattern because the pattern is attached to the cover film. The same applies to the following means.

  The acquisition of the position of the cover film may be performed on the upstream side of the pair of rollers described above, or may be performed on the downstream side. However, when the cover film is stretched by the roller, the extent to which the position of the cover film has changed due to the stretching is immediately reflected in the degree of progress of the upstream cover film. This is because when the cover film is stretched, conveyance of the upstream cover film is immediately delayed. For this reason, it is desirable to obtain the position of the cover film on the upstream side of the roller in consideration of continuously detecting the shift of the cover film. Therefore, "the detection means may detect the magnitude of the shift of the cover film with respect to the packaging film based on the position of the cover film on the upstream side of the roller".

  However, if the position of the cover film is acquired on the downstream side, the shift of the cover film can be detected at a position closer to the sealing means, which is advantageous in terms of increasing accuracy. Therefore, it is conceivable to adopt the following configuration.

Mean 2. An attachment position of the cover film by a sealing means for attaching the cover film in a sealed state so as to close the pocket portion with respect to the packaging film containing the tablet in the pocket portion is attached to the cover film. A position adjusting device for adjusting the design so that the pattern is positioned at an appropriate position of the packaging film;
A pair of rollers for stretching the cover film;
The magnitude of the displacement of the cover film with respect to the packaging film is detected as a first displacement based on the position of the cover film upstream of the roller, and the second based on the position of the cover film downstream of the roller. Detecting means for detecting as a deviation;
A stretching control means capable of adjusting the rotational speed of at least one of the rollers and stretching the cover film;
The stretching control means is configured to adjust the rotational speed of the roller to stretch the cover film according to the first deviation detected by the detection means, and according to the second deviation. The position adjusting device is configured to correct the rotational speed of the roller.

  In the position adjusting apparatus described in the means 2, the detecting means detects the magnitude of the displacement of the cover film with respect to the packaging film as the first displacement based on the position of the cover film on the upstream side of the roller, and also downstream of the roller. The second shift is detected based on the position of the side cover film. The stretching control means adjusts the rotational speed of the roller to stretch the cover film according to the first shift, and corrects the rotational speed of the roller according to the second shift.

  In other words, the cover film is detected on the upstream side (first shift), and the cover film is stretched to eliminate the first shift. There is a possibility that various disturbances such as side expansion and contraction or return after stretching of the cover film will act. Therefore, even after stretching, that is, the shift of the cover film on the downstream side (second shift) is detected, and feedback to the stretching control is performed based on the second shift.

  In this way, since the first shift that is the reference for the cover film stretching control is acquired based on the position of the upstream cover film, the position change of the cover film due to the stretching control can be immediately grasped, It is possible to quickly respond to film displacement. Moreover, since the feedback to the stretching control is performed by the second shift acquired based on the position of the cover film on the downstream side, the pattern attached to the cover film can be matched to the predetermined position of the packaging film with high accuracy. it can. And since the extending | stretching amount of a cover film does not change rapidly like the above-mentioned structure, a cover film can be extended so that the fracture | rupture of a cover film may not be produced.

Means 3. In the position adjusting device according to means 1 or 2,
The detection means detects a magnitude of displacement of the cover film with respect to the packaging film as a difference between the position of the cover film and a predetermined target position of the cover film. apparatus.

  According to the means 3, the detecting means detects the magnitude of the shift of the cover film with respect to the packaging film as a difference between the position of the cover film and a predetermined target position of the cover film. It can be seen in which position the cover film is located at a certain timing, after which no deviation occurs with respect to the packaging film. Therefore, the position of the cover film is set as a target position, and the magnitude of the deviation is detected as a difference from the target position. If it does in this way, the magnitude | size of the shift | offset | difference of the cover film with respect to the film for packaging can be easily detected by acquiring the position of a cover film.

Means 4. In the position adjusting device according to means 3,
The detection means includes mark detection means for detecting a mark attached to the cover film, and position information output means for outputting position information of the packaging film when the mark detection means detects the mark. And a position adjusting device for detecting the position of the cover film as position information from the position information output means.

  According to the means 4, the detection means has mark detection means and position information output means. The mark detecting means detects marks attached to the cover film at predetermined intervals, for example, and the position information output means outputs the position information of the packaging film at the timing when the marks are detected. Thereby, a detection means detects the position of a cover film as position information from a position information output means.

  Since the cover film is stretched, a complicated mechanism is required when detecting the position of the cover film directly, especially when detecting the position of the cover film on the upstream side and downstream side of the roller. Come. Therefore, the means 4 pays attention to the packaging film that is not stretched, and uses the positional information of the packaging film at the detection timing of the mark attached to the cover film. That is, the position of the cover film is captured as position information of the packaging film. Since the target position of the cover film described above can also be replaced with the position information of the packaging film, the size of the shift of the cover film with respect to the packaging film can be detected using the position information of the packaging film. If it does in this way, the magnitude | size of the position shift of a cover film can be detected with a simple structure.

Means 5. In the position adjusting device according to means 4,
The sealing means has an attachment roller for attaching the cover film to the packaging film,
The position information output unit is configured to output position information of the packaging film based on a rotation position of the attachment roller.

  For example, the position information output means described above may output position information of the packaging film based on the rotational position of the attachment roller of the sealing means, as shown in means 5. Specifically, on the assumption that the attachment roller on the packaging film side is provided with a recess corresponding to the pocket portion, the rotation angle or rotation corresponds to one sheet (for example, two pocket portions). The rotation amount based on the angle is output. If it does in this way, the positional information on the packaging film can be output easily.

Means 6. In the position adjusting device according to any one of means 1 to 5,
The pair of rollers is a feeding roller that feeds the cover film downstream, and a stretching roller that is positioned on the upstream side of the feeding roller and capable of stretching the film between the feeding roller,
The position adjusting device, wherein the stretching control means is configured to be able to adjust the rotational speed of the stretching roller according to the rotational speed of the feeding roller.

  According to the means 6, the position adjusting device includes the feeding roller and the stretching roller. The feeding roller feeds the cover film downstream, and the stretching roller is located upstream of the feeding roller and can stretch the film between the feeding roller. And the extending | stretching control means can adjust the rotational speed of an extending | stretching roller according to the rotational speed of a feeding roller. This uses another expression "the stretching control means is configured to be able to adjust the ratio of the rotational speed of the feeding roller and the stretching roller by adjusting the rotational speed of the stretching roller." It is good. In this way, the rotational speed of the feeding roller can be made variable, and the feeding roller can be controlled by a drive system independent of the stretching roller.

Mean 7 In the position adjusting device according to means 6,
A tension roller disposed on the downstream side of the feeding roller and the upstream side of the stretching roller, respectively, and exerting tension on the cover film;
A sliding portion that supports the tension roller at a constant interval and is slidable by a tension relationship acting in the opposite direction on the downstream side of the feeding roller and the upstream side of the stretching roller;
A position adjusting device comprising: a feeding control means for adjusting a rotation speed of the feeding roller so that the sliding portion stays at a substantially constant position.

  In the means 7, the tension roller is disposed on the downstream side of the feeding roller and the upstream side of the stretching roller, respectively, and applies tension to the cover film. The sliding portion supports the tension roller at regular intervals, and is slidable by the relationship of tension acting in the opposite direction on the downstream side of the feeding roller and the upstream side of the stretching roller. Then, the rotation speed of the feeding roller is adjusted by the feeding control means so that the sliding portion remains at a substantially constant position.

  According to the means 7, in order to control the sliding portion that slides by the relationship of tension acting in the opposite direction on the downstream side and the upstream side to a substantially constant position, a constant tension acts on the cover film, and the cover film is formed. Can prevent wrinkles. In addition, since the sliding portion supports the tension roller at regular intervals, the length of the moving path of the cover film does not change even when the sliding portion slides, and the cover film by the above-described detection means. This does not affect the position detection.

Means 8. An attachment position of the cover film by a sealing means for attaching the cover film in a sealed state so as to close the pocket portion with respect to the packaging film containing the tablet in the pocket portion is attached to the cover film. A position adjusting device for adjusting the design so that the pattern is positioned at an appropriate position of the packaging film;
A feeding roller for feeding the cover film downstream;
A feeding motor for driving the feeding roller;
A feeding control means capable of controlling the feeding motor and adjusting a rotation speed of the feeding roller;
A stretching roller located upstream of the feeding roller and capable of stretching a film with the feeding roller;
A stretching motor for driving the stretching roller;
A stretching control means capable of adjusting the rotation speed of the stretching roller by controlling the stretching motor;
The magnitude of the shift of the cover film with respect to the packaging film is detected as a first shift based on the position of the cover film upstream of the stretching roller, and is determined based on the position of the cover film downstream of the feeding roller. Detecting means for detecting as a deviation of two,
The detection means includes mark detection means for detecting a mark attached to the cover film, and position information output means for outputting position information of the packaging film when the mark detection means detects the mark. And detecting the position of the cover film as position information from the position information output means, and detecting the amount of shift of the cover film as a difference from a predetermined target position of the cover film. It is configured as
The stretching control means is detected by the detection means on the assumption that the rotational speed of the stretching roller is adjusted via the stretching motor in accordance with the rotational speed of the feeding roller controlled by the feeding control means. Further, the rotation speed of the stretching roller is adjusted to stretch the cover film according to the first shift, and the rotation speed of the stretching roller is corrected according to the second shift. The position adjusting device characterized by being made.

  The operation of each configuration of the position adjusting device described in the means 8 is as already described in the description of the means. According to such means 8, it will be repeated, but unlike the conventional configuration, since the stretch amount of the cover film does not change abruptly, the cover film is stretched so as not to cause breakage of the cover film. be able to. Moreover, since a cover film is extended according to a shift | offset | difference generate | occur | produced, the design attached | subjected to the cover film can be match | combined with the high precision to the predetermined position of the film for packaging. In addition, since the first shift, which is the reference for the cover film stretching control, is acquired based on the position of the upstream cover film, the change in the position of the cover film due to the stretching control can be immediately grasped, and the cover film shifts. It is possible to respond quickly. Moreover, since the feedback to the stretching control is performed by the second shift acquired based on the position of the cover film on the downstream side, the pattern attached to the cover film can be matched to the predetermined position of the packaging film with high accuracy. it can.

  Moreover, although the shift | offset | difference of a cover film is detected as a difference of the target position of a cover film, and the position of a cover film, the positional information on the packaging film which is not stretched is utilized here. Therefore, it is possible to detect the magnitude of the shift of the cover film with respect to the packaging film with a relatively simple configuration.

  Furthermore, since the rotation speed of the drawing roller is adjusted according to the rotation speed of the feeding roller, the feeding roller can be controlled by a drive system independent of the drawing roller.

  The feeding motor and the stretching motor described above may be any variable speed motor. In this sense, “a feeding motor capable of controlling the speed for driving the feeding roller” and “a stretching motor capable of controlling the speed for driving the stretching roller” may be used. The same applies to the following means.

Means 9. An attachment position of the cover film by a sealing means for attaching the cover film in a sealed state so as to close the pocket portion with respect to the packaging film containing the tablet in the pocket portion is attached to the cover film. A position adjusting device for adjusting the design so that the pattern is positioned at an appropriate position of the packaging film;
A feeding roller for feeding the cover film downstream;
A feeding motor for driving the feeding roller;
A feeding control means capable of controlling the feeding motor and adjusting a rotation speed of the feeding roller;
A stretching roller located upstream of the feeding roller and capable of stretching a film with the feeding roller;
A stretching motor for driving the stretching roller;
A stretching control means capable of adjusting the rotation speed of the stretching roller by controlling the stretching motor;
The magnitude of the shift of the cover film with respect to the packaging film is detected as a first shift based on the position of the cover film upstream of the stretching roller, and is determined based on the position of the cover film downstream of the feeding roller. Detecting means for detecting a deviation of 2;
A tension roller disposed on the downstream side of the feeding roller and the upstream side of the stretching roller, respectively, and exerting tension on the cover film;
A sliding portion that supports the tension roller at a constant interval and is slidable by a relationship of tension acting in the opposite direction on the downstream side of the feeding roller and the upstream side of the stretching roller;
The detection means includes mark detection means for detecting a mark attached to the cover film, and position information output means for outputting position information of the packaging film when the mark detection means detects the mark. And detecting the position of the cover film as position information from the position information output means, and detecting the amount of shift of the cover film as a difference from a predetermined target position of the cover film. Configured and
The feeding control means is configured to adjust the rotational speed of the feeding roller via the feeding motor so that the sliding portion remains in a substantially constant position.
The stretching control means is detected by the detection means on the assumption that the rotational speed of the stretching roller is adjusted via the stretching motor in accordance with the rotational speed of the feeding roller controlled by the feeding control means. Further, the rotation speed of the stretching roller is adjusted to stretch the cover film according to the first shift, and the rotation speed of the stretching roller is corrected according to the second shift. The position adjusting device characterized by being made.

  According to the position adjusting device described in the means 9, the same effect as the position adjusting device described in the means 8 can be obtained. In addition, because the sliding portion that slides is controlled to a substantially constant position by the relationship of the tension acting in the opposite direction on the downstream side and the upstream side, a constant tension acts on the cover film, and the cover film is wrinkled. Can be prevented. In addition, since the sliding portion supports the tension roller at regular intervals, the length of the moving path of the cover film does not change even when the sliding portion slides, and the cover film by the above-described detection means. This does not affect the position detection.

Means 10. In the position adjusting device according to means 8 or 9,
The position adjusting device, wherein the feeding motor and the stretching motor are servo motors.

  According to the means 10, a servo motor is employed as the feeding motor and the stretching motor. Servo motors have the advantage of high reliability due to feedback control. And since many products are marketed, it is advantageous at the point that the thing of desired performance can be obtained easily.

  Although the above has been described as the invention of the position adjusting device, it can also be realized as a PTP sheet manufacturing device including the position adjusting device. It is as shown below.

  Means 11. A PTP sheet manufacturing apparatus comprising the position adjusting apparatus according to any one of means 1 to 10.

  Hereinafter, an embodiment will be described with reference to the drawings.

  As shown in FIGS. 2A and 2C, the PTP sheet 1 in the present embodiment closes the pocket film 2 and the container film 3 as a “packaging film” having a plurality of pocket parts 2. And a sealing film 4 as a “cover film” attached to the container film 3. The container film 3 is made of, for example, a relatively hard thermoplastic resin material having a predetermined rigidity, such as PP (polypropylene) or PVC (polyvinyl chloride), and has light transparency (here, transparent). ). The sealing film 4 is made of a material containing aluminum.

  Each pocket portion 2 contains one tablet 5 as an object to be filled. The container film 3 of the PTP sheet 1 is formed with a plurality of horizontal slits 6 so that it can be separated into, for example, a pair of small pieces including two pocket portions 2 (of course, vertical slits may be formed). And the slit may be omitted).

  Furthermore, a pattern is printed on the surface of the sealing film 4 opposite to the pocket portion 2 (that is, the back surface side of the PTP sheet 1) in sheet units. For example, in the present embodiment, as shown in FIG. 2B, a pattern 8 made up of characters “ABC” is printed on the uppermost portion of the PTP sheet 1 in which the pocket portion 2 is not formed. Such a pattern 8 is printed on the sealing film 4 before the sealing film 4 is attached.

  Therefore, in the process of attaching the sealing film 4 to the container film 3, it is necessary to align the printed symbols. After the sealing film 4 is attached to the container film 3, the film filled with the tablets 5 is cut into the PTP sheet 1. The sealing film 4 before cutting is shown in FIG. As described above, the mark 7 for alignment is printed on the outer edge portion at a predetermined interval (slightly smaller than one sheet). The present embodiment has a feature in alignment by reading the mark 7 attached to the sealing film 4. First, a manufacturing apparatus (PTP packaging machine (blister) for manufacturing the PTP sheet 1 is first described. The configuration of the packaging machine)) 10 will be described.

  As shown in FIG. 1, on the most upstream side of the PTP packaging machine 10, a strip-shaped container film 3 is wound in a roll shape. The container film 3 wound in a roll shape is intermittently conveyed, and the heating means 12 and the pocket forming means 13 are arranged in order along the conveyance path of the container film 3. . These heating means 12 and pocket forming means 13 constitute a pocket portion forming apparatus 14. Then, in the state where the container film 3 is partially heated by the heating device 12 and the container film 3 becomes relatively flexible, the pocket portion 2 is formed in the container film 3 by the pocket forming means 13. The pocket portion 2 is formed at an interval between the transport operations of the container film 3.

  A filling device 16 for automatically filling the tablet 2 with the tablet 5, an appearance inspection device 17, and a sealing means 18 are disposed along the transfer path of the container film 3 in which the pocket portion 2 is formed. The filling device 16 drops the tablet 5 by opening the shutter at predetermined intervals, and the tablet 5 is put into each pocket portion 2 in accordance with the shutter opening operation.

  The appearance inspection device 17 is for inspecting whether or not the tablets 5 are filled in the respective pocket portions 2, whether there are any abnormalities in appearance such as chipping or cracking of the tablets 5, and the presence or absence of foreign matter. is there. The appearance inspection device 17 performs an inspection from the opening side of the pocket portion 2.

  On the other hand, the sealing film 4 formed in a belt shape is wound in a roll shape on the most upstream side. The drawing end of the sealing film 4 wound in a roll shape is guided toward the sealing means 18. The sealing means 18 includes a film receiving roller 19 and a heating roller 20, and is configured so that the heating roller 20 can be pressed against the film receiving roller 19. The container film 3 and the sealing film 4 are fed between the rollers 19 and 20, and the container film 3 and the sealing film 4 pass between the rollers 19 and 20 in a heated and pressed state. Thus, the sealing film 4 is adhered to the container film 3, thereby producing the PTP film 21 as a band-shaped blister film in which the tablets 5 are filled in the pocket portions 2. A recess corresponding to the pocket portion 2 of the container film 3 is formed on the surface of the film receiving roller 19. On the other hand, the surface of the heating roller 20 is formed with fine mesh-like ridges for sealing, and a strong seal is realized by strongly pressing them.

  As described above, the pattern 8 consisting of the letters “ABC” is attached to the surface of the PTP sheet 1 opposite to the pocket portion 2 of the sealing film 4 (see FIG. 2B). In the present embodiment, as the sealing film 4 wound in a roll shape, a pattern 8 is printed in advance at predetermined intervals. However, a printing means is provided in the PTP packaging machine 10 and affixed. Printing may be performed immediately before wearing.

  Then, the PTP film 21 is cut as described later to become the PTP sheet 1 described above. In this embodiment, the sealing film is used so that the pattern 8 is attached to a predetermined position of the cut PTP sheet 1. A position adjusting device 22 for adjusting the position 4 is provided on the upstream side of the sealing means 18. The position adjusting device 22 will be described later.

  An appearance inspection device 23 for detecting an abnormality of the tablet 5 or the like from the pocket portion 2 side is provided downstream of the sealing means 18. In addition, when a defective product is determined by the appearance inspection devices 17 and 23, a defective product signal is sent to a defective sheet discharge mechanism (not shown), and the PTP sheet that has been determined as defective is separately discharged by the defective sheet discharge mechanism, It is transferred to a defective hopper (not shown).

  A slit forming device 24 and a sheet punching device 26 are sequentially arranged along the PTP film 21 transfer path downstream of the appearance inspection device 23. The slit forming device 24 has a function of forming the horizontal slit 6 at a predetermined position of the PTP film 21. The sheet punching device 26 has a function of punching the PTP film 21 in units of one PTP sheet. On the downstream side of the sheet punching device 26, a scrap hopper 28 for storing the end material 27 falling from the sheet punching device 26 is provided. Further, a conveyor 29 for transferring the punched PTP sheet 5 is provided below the sheet punching device 26, and the PTP sheet 5 is transferred to the finished product hopper 30. Yes.

  Now, the outline of the PTP packaging machine 10 is as described above. Hereinafter, the position adjusting device 22 provided on the upstream side of the sealing means 18 will be described more specifically based on FIGS. 3 and 4.

  As shown in FIG. 3, the position adjusting device 22 includes a step roller 40, a stretching sensor 51, stretching means 60, tension means 70, stretching along the transfer path of the sealing film 4 wound in a roll shape. A rear sensor 52 and a position detection encoder 53 are provided.

  The step roller 40 includes a weight roller 41 that can move in the vertical direction, and the weight roller 41 pulls the cover film down below the support roller 42 by its own weight. As a result, a tension in the direction opposite to the moving direction of the sealing film 4 acts. This is shown as symbol T1.

  The stretching means 60 includes a pair of rollers 61 and 62. The pair of rollers 61 and 62 are positioned on the upstream side of the feeding roller 61 and the feeding roller 61 that feeds the sealing film 4 downstream, and the sealing film 4 can be stretched between the feeding roller 61. A drawing roller 62 is provided. In this embodiment, the diameters of the feeding roller 61 and the stretching roller 62 are the same, and are driven by the feeding servo motor 63 and the stretching servo motor 64, respectively. In the figure, the servomotors 63 and 64 are indicated as SM1 and SM2.

  The tension means 70 includes a pair of tension rollers 71 and 72. One tension roller 71 is provided on the downstream side of the feeding roller 61, and the other tension roller 72 is provided on the upstream side of the stretching roller 62. These tension rollers 71 and 72 are supported by the sliding portion 73 at regular intervals. The sliding portion 73 slides on the rail 74 by a balance of tension acting in the opposite direction on the upstream side and the downstream side. Specifically, the tension indicated by the symbol T1 acts on the upstream side of the stretching roller 62, but on the contrary, the tension indicated by the symbol T2 also acts on the downstream side of the feeding roller 61. Therefore, the sliding portion 73 slides to the right when T1> T2 and to the left when T1 <T2 due to the balance between the tensions T1 and T2. Specifically, if the amount of the sealing film 4 fed from the feeding roller 61 is larger than the amount of the sealing film 4 sent by the sealing means 18, the tension indicated by T1 acts and the sliding portion 73 Slide in the direction. If the amount of the sealing film 4 fed from the feeding roller 61 is less than the amount of the sealing film 4 fed by the sealing means 18, the tension indicated by T2 is greater than T1 and the sliding portion 73 Slide in the direction. A rack 75 is integrally attached to the sliding portion 73, and the linear motion of the sliding portion 73 is taken out as a rotational motion by the pinion gear 76. The tension encoder 77 outputs position information of the sliding portion 73 using such a rack and pinion mechanism.

  The stretching sensor 51 is provided on the upstream side of the stretching roller 62, and detects the passage of the mark 7 of the sealing film 4 shown in FIG. On the other hand, the post-stretching sensor 52 is provided on the downstream side of the feeding roller 61 and similarly detects the passage of the mark 7 of the sealing film 4. The position detection encoder 53 outputs the position information of the container film 3 at this detection timing. The position detection encoder 53 outputs the rotation amount (that is, the rotation position) of the film receiving roller 19 from a predetermined reference position. Specifically, the rotation angle (angle indicated by symbol α) of one sheet (two recesses 19a corresponding to the pocket portion 2) is equally divided into a predetermined angle, and a predetermined reference position is determined based on the angle. The amount of rotation from is output. In the present embodiment, the rotation amount is output. However, the rotation angle may be output. Further, in this embodiment, the rotation amount is output in units of one sheet in order to attach a symbol to each sheet. However, in the case of attaching symbols in another unit, the rotation amount may be output for each unit. Good. For example, if the symbols are attached every two sheets, the rotation amount may be output in units of two sheets or three sheets. Further, in the present embodiment, one sheet corresponds to two pocket portions 2, but if the PTP sheet has three pocket portions 2 in one sheet, three recesses 19a corresponding to the pocket portions 2 are provided. The rotation amount may be output in correspondence with the minutes.

  Next, the operation of the position adjusting device 22 configured as described above will be described. FIG. 4 is an explanatory diagram showing a control block of the position adjusting device 22. The control in this embodiment controls the rotational speed of the rollers 61 and 62 via the servo motors 63 and 64, and is performed by a computer system. In this sense, the computer system corresponds to “feeding control means” and “stretching control means” in the “means for solving the problems” column. Since the configuration of the computer system is well known to those skilled in the art, the description thereof is omitted.

  First, control of the feeding roller 61 will be described. As described above, the sliding portion 73 slides on the rail 74 by the balance between the tensions T1 and T2 on the upstream side and the downstream side of the rollers 61 and 62. This slide is taken out by a rack and pinion mechanism by a tension encoder 77, and position information K is output from the tension encoder 77 as shown in FIG. On the other hand, in the block a, the coefficient F is multiplied and the velocity component FK is output. Next, in block b, the sum of the basic speed V and the speed component FK of the PTP packaging machine 10 is taken. Then, the feeding roller 61 is controlled at the rotational speed (V + FK) via the feeding servo motor 63. Specifically, when the downstream tension T2 becomes smaller than the upstream tension T1 of the rollers 61 and 62 shown in FIG. 3, the sliding portion 73 moves to the right. At this time, the output value K of the tension encoder 77 is reduced. As a result, the rotational speed (V + FK) of the feeding roller 61 is reduced, and the feeding amount of the sealing film 4 from the feeding roller 61 is reduced. As a result, the downstream tension T2 increases and the sliding portion 73 moves to the left. On the contrary, when the downstream tension T2 becomes larger than the upstream tension T1 of the rollers 61 and 62, the sliding portion 73 moves to the left. At this time, the output value K of the tension encoder 77 is increased. As a result, the rotational speed (V + FK) of the feeding roller 61 is increased, and the amount of the sealing film 4 fed from the feeding roller 61 is increased. As a result, the downstream tension T2 decreases, and the sliding portion 73 moves to the right. As a result, the feeding roller 61 is controlled so that the sliding portion 73 stays at a substantially constant position, that is, the position information K takes a constant value.

  In contrast to the control of the feeding roller 61, the stretching roller 62 is controlled via the stretching servo motor 64 at a rotational speed (G (V + FK)) multiplied by the stretching ratio G in the block c. Of course, instead of obtaining the stretching ratio G, a decrease G ′ of the rotational speed for stretching the sealing film 4 at a predetermined stretching ratio is obtained, and the stretching roller 62 is controlled at the rotational speed (V + FK−G ′). May be.

  Next, calculation of the stretching ratio G will be described with reference to FIG. As described above, when the passage of the mark 7 of the sealing film 4 is detected by the stretching sensor 51, the position detection encoder 53 outputs the rotation amount A of the film receiving roller 19 as position information of the container film 3. (Block d). The position information A output here indicates the position of the sealing film 4 on the upstream side. By the way, the target position of the sealing film 4 where no deviation occurs can also be expressed as the rotation amount of the film receiving roller 19. This is input as the upstream target position Q, and the difference is calculated in block e. This difference indicates the magnitude of the deviation (first deviation) based on the position of the sealing film 4 on the upstream side.

  On the other hand, when the post-stretching sensor 52 detects the passage of the mark 7 of the sealing film 4, the position detection encoder 53 outputs the rotation amount B of the film receiving roller 19 as position information of the container film 3 (block). f). The position information B output here indicates the position of the sealing film 4 on the downstream side. By the way, as described above, the target position of the sealing film 4 where no deviation occurs can also be expressed as the rotation amount of the film receiving roller 19. This is input as the downstream target position P, and the difference (P−B) is calculated in block g. This difference (P−B) indicates the magnitude of the shift (second shift) based on the position of the sealing film 4 on the downstream side. In block h, the feedback coefficient C is multiplied to output a feedback amount (C (P−B)). In block i, the upstream target position Q is corrected by this feedback amount (C (P−B)).

  As described above, the difference is calculated in the block e. To be precise, the difference (Q + C (P−B)) obtained by correcting the target position Q with the feedback amount (C (P−B)) ( Q + C (P−B) −A) is calculated. Then, in block j, the stretching ratio G is calculated by multiplying by the coefficient E. Therefore, the stretch ratio G is E (Q + C (P−B) −A).

  From the above, the stretching sensor 51, the post-stretching sensor 52, and the position detection encoder 53 of the present embodiment correspond to “detecting means”.

  Next, the effect which the PTP packaging machine 10 of this embodiment exhibits is demonstrated.

  In the present embodiment, the displacement of the sealing film 4 is grasped as an amount, and the sealing film 4 is stretched according to the displacement. As a result, unlike the conventional configuration, the amount of stretching of the sealing film 4 does not change abruptly, so that the sealing film 4 can be stretched so as not to break the sealing film 4. Further, when the shift occurs, the sealing film 4 is stretched accordingly, so that the design attached to the sealing film 4 can be matched with a predetermined position of the container film 3 with high accuracy.

  Specifically, as shown in FIG. 3, a deviation (first deviation) of the sealing film 4 is detected on the upstream side of the stretching roller 62, and the sealing film 4 is stretched to eliminate the first deviation. . Specifically, when the mark 7 of the sealing film 4 is detected by the stretching sensor 51, the position information A is output from the position detection encoder 53 (block d in FIG. 4B). The stretch rate G of the sealing film 4 is calculated from the difference from the upstream target position Q (block e, block j). Here, a shift (second shift) of the sealing film 4 is also detected on the downstream side of the feeding roller 61, and the upstream target position is corrected based on the second shift. Specifically, when the mark 7 of the sealing film 4 is detected by the post-stretching sensor 52, the position information B is output from the position detection encoder 53 (block f). A feedback amount (C (P−B)) is calculated from the difference between the position information B and the downstream target position P (block g, block h), and the upstream target position Q is corrected (block i). Then, the stretching ratio G is corrected (block j). Thus, since the 1st shift | offset | difference used as the reference | standard of the extending | stretching control of the sealing film 4 is acquired based on the position of the upstream sealing film 4, the position change of the sealing film 4 by extending | stretching control is grasped immediately. It is possible to quickly cope with the displacement of the sealing film 4. Moreover, since the feedback to the stretching control is performed by the second shift acquired based on the position of the sealing film 4 on the downstream side, the pattern attached to the sealing film 4 is placed at a predetermined position on the container film 3 with high accuracy. Can be combined.

  Moreover, in this embodiment, in order to detect the magnitude | size of the shift | offset | difference of the sealing film 4 as a difference with the target positions Q and P determined beforehand, a container film is simply acquired by acquiring the position of the sealing film 4 3 can be detected.

  Here, in detecting the position of the sealing film 4, attention is paid to the container film 3 that is not stretched, and position information of the container film 3 at the detection timing of the mark 7 attached to the sealing film 4 is used. That is, the position of the sealing film 4 is captured as position information of the container film 3. Since the target position of the sealing film 4 can also be replaced with the position information of the container film 3, the position information of the container film 3 can be used to detect the magnitude of the deviation of the sealing film 4 with respect to the container film 3. it can. Since the position information of the container film 3 is output from the position detection encoder 53 as the rotation amount of the film receiving roller 19, the magnitude of the positional deviation of the sealing film 4 can be detected with a simple configuration.

  Furthermore, in this embodiment, the sliding part 73 slides on the rail 74 by the balance of the tensions T1 and T2 on the upstream side and the downstream side of the rollers 61 and 62. Then, the position information K of the sliding portion 73 is output by the tension encoder 77 (see FIG. 4A), and is multiplied by the coefficient F to become the speed component FK (block a), and the PTP packaging machine The sum of the basic speed V and the speed component FK of 10 is taken (block b), and the feeding roller 61 is controlled at the rotational speed (V + FK) via the feeding servo motor 63. On the other hand, the stretching roller 62 is controlled by a rotational speed (G (V + FK)) multiplied by a stretching ratio G via a stretching servo motor 64. As a result, the feeding roller 61 can perform control independent of the stretching roller 62. In the present embodiment, since the sliding portion 73 is controlled to be at a substantially constant position, that is, K is controlled to have a constant value, a constant tension acts on the sealing film 4 to form the sealing film 4. Can prevent wrinkles. In addition, since the sliding portion 73 supports the tension rollers 71 and 72 at regular intervals, there is no change in the length of the moving path of the sealing film 4 even if the sliding portion 73 slides. This does not affect the position detection of the sealing film 4.

  In the embodiment described above, for example, a part of the configuration can be appropriately changed as follows. Of course, other modifications not exemplified below are also possible.

  (A) In the above embodiment, the displacement of the sealing film 4 on the upstream side and the downstream side is detected. On the other hand, it is good also as a structure which detects the shift | offset | difference at least one among an upstream side and a downstream side, and extends the film 4 for sealing. However, how much the position of the sealing film 4 is changed by stretching is immediately reflected in the degree of progress of the upstream sealing film 4. This is because when the sealing film 4 is stretched, the conveyance of the upstream sealing film 4 is immediately delayed. Therefore, in view of continuously detecting the shift of the sealing film 4, it is desirable to acquire the position of the sealing film 4 on the upstream side of the stretching roller 62. On the other hand, if the position of the sealing film 4 is acquired on the downstream side, the displacement of the sealing film 4 can be detected at a position closer to the sealing means 18, which is advantageous in terms of increasing accuracy. Therefore, as in the above-described embodiment, the configuration in which the shift of the sealing film 4 on the downstream side is fed back to the stretching control is the best.

  (B) In the above-described embodiment, the tension T1 is applied to the upstream side of the stretching roller 62 using the step roller 40. However, a configuration in which the step roller 40 is not used may be considered. For example, the sliding portion 73 itself may be urged rightward by a spring or the like.

  (C) In the above embodiment, it is considered that the pattern 8 made of the characters “ABC” is attached to the back side surface of the PTP sheet 1. On the other hand, as shown in FIG. 5, the present invention can also be applied to a case where a barcode (design) 9 is attached to the back side surface of the PTP sheet 1. In recent years, there has been an increasing need to check whether prescriptions and handed tablets are correct in pharmacies and hospitals, and what kind of drugs they are. Has been. In such a case, it is necessary to adjust the position of the code information (design) at least for each sheet unit. The reason is that at least the case where code information is attached in one administration unit (for example, two tablets) (see FIG. 5) is considered, and the smaller the unit to which the code information is attached, the more accurate the position adjustment. Therefore, the effect of the present invention stands out.

  In this sense, in the present invention, the symbol may be code information. Further, “the symbol may be code information given in sheet units or administration units”. The code information includes a one-dimensional code such as a barcode and a two-dimensional code such as a QR code.

  (D) In the above embodiment, servo motors are used for driving the rollers 61 and 62 as the feeding servo motor 63 and the stretching servo motor 64. Servo motors are highly reliable because of feedback control, and since many products are commercially available, it is advantageous in that a desired performance can be easily obtained.

  However, other motors may be adopted as long as the motor can control the speed. For example, a pulse motor, a combination of an inverter and an AC motor, or a DC motor capable of speed control by voltage or pulse width may be employed.

It is a schematic block diagram of a manufacturing apparatus (PTP packaging machine). (A) is a perspective view which shows the front side of a PTP sheet, (b) is a perspective view which shows the back side of a PTP sheet, (c) is a partial expanded sectional view which shows a PTP sheet, (d) For sealing It is a partial top view of a film. It is a schematic block diagram of a position adjustment apparatus. It is a block diagram which shows the extending | stretching control in a position adjustment apparatus. It is a perspective view which shows the back side of the PTP sheet in another embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... PTP sheet, 2 ... Pocket part, 3 ... Container film as packaging film, 4 ... Sealing film as cover film, 5 ... Tablet, 7 ... Mark, 8 ... Design, 9 ... Bar code as design, DESCRIPTION OF SYMBOLS 10 ... PTP packaging machine as a PTP sheet manufacturing apparatus, 18 ... Sealing means, 19 ... Film receiving roller as attachment roller, 22 ... Position adjustment apparatus, 51 ... Stretching sensor as mark detection means, 52 ... Mark detection Post-stretching sensor as means, 53... Position detection encoder as position information output means, 60... Stretching means, 61... Feeding roller, 62 ... stretching roller, 63 ... feeding servomotor, 64. 71, 72 ... tension roller, 73 ... sliding part.

Claims (10)

An attachment position of the cover film by a sealing means for attaching the cover film in a sealed state so as to close the pocket portion with respect to the packaging film containing the tablet in the pocket portion is attached to the cover film. A position adjusting device for adjusting the design so that the pattern is positioned at an appropriate position of the packaging film;
A pair of rollers for stretching the cover film;
The magnitude of the displacement of the cover film with respect to the packaging film is detected as a first displacement based on the position of the cover film upstream of the roller, and the second based on the position of the cover film downstream of the roller. Detecting means for detecting as a deviation;
A stretching control means capable of adjusting the rotational speed of at least one of the rollers and stretching the cover film;
The stretching control means is configured to adjust the rotational speed of the roller to stretch the cover film according to the first deviation detected by the detection means, and according to the second deviation. The position adjusting device is configured to correct the rotational speed of the roller. The position adjusting device according to claim 1 ,
The detection means detects a magnitude of displacement of the cover film with respect to the packaging film as a difference between the position of the cover film and a predetermined target position of the cover film. apparatus. The position adjusting device according to claim 2 ,
The detection means includes mark detection means for detecting a mark attached to the cover film, and position information output means for outputting position information of the packaging film when the mark detection means detects the mark. And a position adjusting device for detecting the position of the cover film as position information from the position information output means. In the position adjustment device according to claim 3 ,
The sealing means has an attachment roller for attaching the cover film to the packaging film,
The position information output unit is configured to output position information of the packaging film based on a rotation position of the attachment roller. The position adjusting device according to any one of claims 1 to 4 ,
The pair of rollers is a feeding roller that feeds the cover film downstream, and a stretching roller that is positioned on the upstream side of the feeding roller and capable of stretching the film between the feeding roller,
The position adjusting device, wherein the stretching control means is configured to be able to adjust the rotational speed of the stretching roller according to the rotational speed of the feeding roller. In the position adjustment device according to claim 5 ,
A tension roller disposed on the downstream side of the feeding roller and the upstream side of the stretching roller, respectively, and exerting tension on the cover film;
A sliding portion that supports the tension roller at a constant interval and is slidable by a tension relationship acting in the opposite direction on the downstream side of the feeding roller and the upstream side of the stretching roller;
A position adjusting device comprising: a feeding control means for adjusting a rotation speed of the feeding roller so that the sliding portion stays at a substantially constant position. An attachment position of the cover film by a sealing means for attaching the cover film in a sealed state so as to close the pocket portion with respect to the packaging film containing the tablet in the pocket portion is attached to the cover film. A position adjusting device for adjusting the design so that the pattern is positioned at an appropriate position of the packaging film;
A feeding roller for feeding the cover film downstream;
A feeding motor for driving the feeding roller;
A feeding control means capable of controlling the feeding motor and adjusting a rotation speed of the feeding roller;
A stretching roller located upstream of the feeding roller and capable of stretching a film with the feeding roller;
A stretching motor for driving the stretching roller;
A stretching control means capable of adjusting the rotation speed of the stretching roller by controlling the stretching motor;
The magnitude of the shift of the cover film with respect to the packaging film is detected as a first shift based on the position of the cover film upstream of the stretching roller, and is determined based on the position of the cover film downstream of the feeding roller. Detecting means for detecting as a deviation of two,
The detection means includes mark detection means for detecting a mark attached to the cover film, and position information output means for outputting position information of the packaging film when the mark detection means detects the mark. The position of the cover film is detected as position information from the position information output means, and the amount of shift of the cover film is detected as a difference from a predetermined target position of the cover film. It is configured as
The stretching control means is detected by the detection means on the assumption that the rotational speed of the stretching roller is adjusted via the stretching motor in accordance with the rotational speed of the feeding roller controlled by the feeding control means. Further, the rotational speed of the stretching roller is adjusted to stretch the cover film according to the first shift, and the rotational speed of the stretching roller is corrected according to the second shift. The position adjusting device characterized by being made. An attachment position of the cover film by a sealing means for attaching the cover film in a sealed state so as to close the pocket portion with respect to the packaging film containing the tablet in the pocket portion is attached to the cover film. A position adjusting device for adjusting the design so that the pattern is positioned at an appropriate position of the packaging film;
A feeding roller for feeding the cover film downstream;
A feeding motor for driving the feeding roller;
A feeding control means capable of controlling the feeding motor and adjusting a rotation speed of the feeding roller;
A stretching roller located upstream of the feeding roller and capable of stretching a film with the feeding roller;
A stretching motor for driving the stretching roller;
A stretching control means capable of adjusting the rotation speed of the stretching roller by controlling the stretching motor;
The magnitude of the shift of the cover film with respect to the packaging film is detected as a first shift based on the position of the cover film upstream of the stretching roller, and is determined based on the position of the cover film downstream of the feeding roller. Detecting means for detecting a deviation of 2;
A tension roller disposed on the downstream side of the feeding roller and the upstream side of the stretching roller, respectively, and exerting tension on the cover film;
A sliding portion that supports the tension roller at a constant interval and is slidable by a relationship of tension acting in the opposite direction on the downstream side of the feeding roller and the upstream side of the stretching roller;
The detection means includes mark detection means for detecting a mark attached to the cover film, and position information output means for outputting position information of the packaging film when the mark detection means detects the mark. And detecting the position of the cover film as position information from the position information output means, and detecting the amount of shift of the cover film as a difference from a predetermined target position of the cover film. Configured and
The feeding control means is configured to adjust the rotational speed of the feeding roller via the feeding motor so that the sliding portion remains in a substantially constant position.
The stretching control means is detected by the detection means on the assumption that the rotational speed of the stretching roller is adjusted via the stretching motor in accordance with the rotational speed of the feeding roller controlled by the feeding control means. Further, the rotation speed of the stretching roller is adjusted to stretch the cover film according to the first shift, and the rotation speed of the stretching roller is corrected according to the second shift. The position adjusting device characterized by being made. The position adjusting device according to claim 7 or 8 ,
The position adjusting device, wherein the feeding motor and the stretching motor are servo motors. The manufacturing apparatus of a PTP sheet provided with the position adjustment apparatus in any one of Claims 1 thru | or 9 .

Images