JP2008127092A - Film feeding apparatus, and packaging apparatus equipped with this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film feeding apparatus which can reduce the loss of a film in a film joining process by a compact constitution, and to provide a packaging apparatus. <P>SOLUTION: In a combined metering system 1 in this film feeding apparatus, a control section 10 makes a shaft 18a take up and rotate by controlling a shaft driving section 19a when the final end section of the film F of a film roll FR1 during feeding is detected by the control section 10 based on a second encoder 51 in order to join the joining position in a vicinity of the final end section of the film F of the film roll FR1 during the feeding to the joining position in a vicinity of the starting end section of the film F of a film roll FR2 for spare. Then, the control section 10 controls the shaft driving section 19a, and the film F is taken up by 90 mm from the point at which a register mark sensor 21 senses a register mark M. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a film supply device that supplies a packaging material to a bag making and packaging machine that forms a packaging material in a cylindrical shape and fills and packages snacks and the like, and a packaging device including the same.

  BACKGROUND ART A bag making and packaging machine exists as an apparatus for filling a bag with an object to be packaged such as food while manufacturing the bag.

  For example, a bag making and packaging machine, which is one of packaging apparatuses, forms a sheet-like film (wrapping material) into a cylindrical shape by a former and a tube, and forms a vertical edge on which the cylindrical packaging material is overlapped by vertical sealing means. Seal (heat seal) to make a bag. After filling the cylindrical packaging material that will become the bag through the tube and sealing it across the upper part of the bag and the lower part of the succeeding bag by the horizontal sealing means below the tube, the center of the horizontal seal part is cut by the cutter Disconnect with. Moreover, the bag making packaging machine generally includes a film supply device, and is disposed adjacent to the bag making packaging machine main body. And the film roll by which the film was wound is set to the film supply apparatus, and a film is supplied with respect to a bag making packaging machine.

  In such a film supply apparatus, when a film roll for replacement is set and there is no film in the film roll being supplied, the film end portion of the film roll being supplied and the film start edge of the film roll for replacement are used. The operation is performed by joining the parts together.

  Here, generally, a mark called a registration mark is printed on the film at equal intervals along the length direction in order to place the pattern printed on the film at the same position on the bag to be formed. ing. In the bag making and packaging machine, the horizontal seal, the timing of cutting, and the like are adjusted by detecting this registration mark. In the film supply apparatus, the registration process is automatically performed by superimposing the registration marks on the registration mark as a mark.

In order for the film supply apparatus to automatically perform the joining process of the film, it is necessary to detect a registration mark printed on the film being conveyed and to align the position with the joining position of the new film. As such a bag making and packaging machine provided with a film supply apparatus having a registration mark detecting means, a bag making and packaging machine as shown in Patent Document 1 is disclosed. For example, by using a detection unit as shown in Patent Document 1, it is possible to detect a registration mark of a packaging material conveyed in the conveyance direction. For example, by sending the film from the time when the end of the film roll is detected until the registration mark is detected, it is possible to align the new film with the joining position.
JP 2003-104306 A (published April 9, 2003)

  However, the film supply apparatus including the conventional detection means has the following problems.

  That is, when a film roll of a type in which the end of the film and the paper tube around which the film is wound is fixed (hereinafter referred to as a fixed type) is used, there is no film to be sent out when the end of the film is detected. As a result, no further film can be supplied. Therefore, align the remaining amount of the film with some margin and cut unnecessary parts, or place a film of a predetermined length between the joining position and the film roll supply unit. A mechanism capable of sending out even after the end detection, that is, a so-called buffer unit, is provided to cope with the case of using a fixed type film. For this reason, there is a problem that the amount of the film that is processed in vain increases, and when the buffer unit is provided, the film supply device is increased in size.

  The subject of this invention is providing the film supply apparatus and packaging apparatus which can reduce the loss of the film in the joining process of a film with a compact structure.

  The film supply apparatus according to the first invention supports a plurality of film rolls around which a long film is wound in a rotatable state, while transporting the film from the film roll to the downstream side, When the film of one film roll runs out, it is a film supply device that seams and conveys the vicinity of the start end of the film fed from the other film roll and the vicinity of the end of the film fed from one film roll. A roll support section, a transport mechanism, a terminal end detection section, a splicer section, a registration mark detection section, and a control section. The roll support unit rotatably supports the supply film roll and the replacement film roll. The transport mechanism transports the film in the supply direction. The end detection unit detects the end of the supply film roll. The splicer portion joins the vicinity of the end portion of the supply film and the vicinity of the start end portion of the replacement film. The registration mark detection unit detects a registration mark for alignment printed on the film. When the end detection unit detects the end of the film roll, the control unit conveys the film in a direction opposite to the supply direction, and positions the replacement film based on the detection result in the registration mark detection unit. To control.

  Here, in order to join the splicing position near the start end of the replacement film and the splicing position near the end of the supply film, the control unit detects the end of the film being supplied by the end detection unit. Then, the transport mechanism is controlled so that the film is transported in the direction opposite to the supply direction. And a control part controls a conveyance mechanism so that it may position with respect to the joint position of the film for replacement | exchange based on the detection result in a registration mark detection part.

  The term “detecting the end of the film roll” as used herein refers to, for example, a type of film roll in which the end of the film and the paper tube around which the film is wound are fixed (hereinafter referred to as a fixed type). This is to detect the moment when the film can no longer be sent out. In the film roll of the type in which the end of the film and the paper tube around which the film is wound are not fixed (hereinafter referred to as non-fixed type) , Including detecting the moment the film leaves the paper tube.

  Here, in general, when films are joined together, the registration marks printed on the films are used as marks to join them together. Specifically, registration marks are joined together, or positions that are a predetermined distance away from the registration marks are joined together.

  Conventionally, when positioning with respect to the supply film based on the registration mark detection result, the film is conveyed in the supply direction. For this reason, the remaining amount of film in the film roll is secured to a certain extent, alignment is performed, unnecessary portions are cut, or a buffer part is provided between the splicer part and the film roll mounting part, so that the fixed type This corresponds to the case of using the film. However, there is a problem that the amount of the film that is processed wastefully increases, and when the buffer unit is provided, the film supply device becomes large.

  Therefore, in the film supply apparatus of the present invention, after detecting the end of the film roll, the transfer mechanism is controlled so that the film is conveyed in the direction opposite to the supply direction, that is, the winding direction in the roll support portion, and the registration mark Based on the detection result in the detection unit, the replacement film is positioned with respect to the joining position.

  As a result, the film can be moved in the winding direction so that it can be positioned with respect to the replacement film, so there is no need to secure the remaining amount and seam, and the film can be fed in the supply direction after detecting the end of the film. It is possible to avoid the provision of a buffer unit for the purpose.

  As a result, it is possible to reduce film loss in the film splicing process with a compact configuration.

  A film supply apparatus according to a second aspect of the present invention is the film supply apparatus according to the first aspect of the present invention, wherein the transport mechanism has a drive section that rotates the roll support section. And a control part controls a drive part and performs positioning.

  Here, the control unit controls the drive unit included in the transport mechanism to transport the film in the direction opposite to the supply direction. Specifically, the control unit rotates the film support unit in the direction opposite to the direction of rotation in the supply direction, that is, the direction of winding the film, and transports the film in the direction opposite to the supply direction.

  This makes it possible to easily transport the film in the direction opposite to the supply direction.

  A film supply apparatus according to a third aspect of the present invention is the film supply apparatus according to the first or second aspect of the present invention, wherein the transport mechanism has a pair of rollers formed by a pair of rollers that sandwich the film. Then, the controller performs positioning by rotating the roller pair.

  Here, the control unit controls the roller pair included in the transport mechanism to transport the film in the direction opposite to the supply direction. Specifically, the control unit rotates the roller pair in the direction opposite to the direction of rotation in the supply direction to convey the film in the direction opposite to the supply direction.

  Here, in the non-fixed type film roll, once the film is detached from the paper tube, the film cannot be wound by the rotation of the roller support portion.

  Thereby, even when the film is detached from the paper tube in the non-fixed type film roll, the film can be easily conveyed in the direction opposite to the supply direction.

  A film supply apparatus according to a fourth aspect of the present invention is the film supply apparatus according to any one of the first to third aspects of the present invention, and is a feed amount that measures a feed amount that is a moving distance along the film transport direction. A measurement unit is further provided.

  Here, for example, a feeding distance measuring unit such as an encoder attached to a roller support unit or a roller pair and detecting rotation, the conveyance distance in the direction opposite to the feeding direction or the feeding direction, that is, the feeding amount of the film is measured. be able to.

  As a result, for example, when positioning the replacement film with respect to the splicing position, it is possible to perform positioning flexibly, such as positioning at a predetermined distance away from the registration mark position in the direction opposite to the conveyance direction. It becomes.

  A film supply apparatus according to a fifth aspect of the present invention is the film supply apparatus according to the fourth aspect of the present invention, wherein the feed amount measuring unit calculates a feed amount based on the rotation of the rollers forming the roller pair.

  Here, the film feed amount can be calculated based on the rotation of the roller, for example, from an encoder or the like that can convert a mechanical displacement amount such as rotation into an electric signal and process it to calculate the position and speed, etc. The film feed amount is calculated.

  Thereby, the film feed amount can be easily calculated.

  A film supply apparatus according to a sixth aspect of the present invention is the film supply apparatus according to any one of the first to fifth aspects, wherein the film supply apparatus is arranged on the downstream side of the splicer portion so as to be movable in a substantially vertical direction, A tension roller for applying a predetermined tension to the tension roller is further provided. And a control part calculates the feed amount of the film conveyed in the direction opposite to a supply direction based on the position in the vertical direction of a tension roller.

  Here, the control unit determines whether the film can be conveyed in the direction opposite to the supply direction.

  Here, the tension roller that applies a constant tension to the film is arranged so as to be movable along the vertical direction when the tension received from the film is greater than the tension that the tension roller applies to the film. The tension roller moves vertically upward. On the other hand, when the tension received from the film is smaller than the tension applied to the film by the tension roller, the tension roller moves vertically downward. With such a configuration, the film tension can be calculated from the position of the tension roller in the vertical direction.

  As a result, the control unit can determine whether or not the film can be sent in the direction opposite to the conveyance direction. For example, when there is no film that can be sent in the direction opposite to the conveyance direction, the supply is performed again. Control such as sending in the direction can be performed.

  A film supply apparatus according to a seventh aspect is the film supply apparatus according to the sixth aspect, wherein the end detection unit detects the end of the film roll based on the position of the tension roller in the vertical direction.

  Here, a tension roller is used to detect the end of the film roll.

  Thereby, it becomes possible to easily detect the end of the film roll without separately providing the end detection unit.

  A film supply device according to an eighth aspect of the present invention is the film supply device according to any one of the first to seventh aspects, wherein the film roll includes a terminal portion of the film and a paper tube around which the film is wound. Is fixed.

  Here, a fixed film roll can be used.

  Here, as described above, the film roll includes a fixed type film roll and a non-fixed type film roll. When a fixed type film roll is used, if the end of the film roll is detected, the film cannot be fed any further, so that the alignment cannot be performed. Therefore, in general, a film having a predetermined length is secured between the roll support portion and the splicer portion so that the film can be fed to the position where the films are joined after the end of the film roll is detected. A buffer section is provided.

  However, in the present invention in which the film is controlled so as to be conveyed in the direction opposite to the conveyance direction after the end of the film roll is detected, such a buffer portion or the like need not be provided.

  Thereby, when using a fixed type film, it is not necessary to provide a buffer part etc. between a roll support part and a splicer part, and it can avoid the enlargement of a film supply apparatus. Especially effective.

  A packaging device according to a ninth invention includes the film supply device according to any one of the first to eighth inventions.

  Here, a film supply apparatus is provided that is capable of reducing film loss in a film splicing process with a compact configuration.

  Thereby, it becomes possible to form the size of the whole packaging apparatus compactly, and also it becomes possible to reduce a loss also about the film used with a packaging apparatus.

  According to the film supply apparatus of the present invention, it is possible to reduce film loss in film splicing processing with a compact configuration.

  A combination weighing system 1 equipped with a film supply unit (film supply apparatus) 6 according to an embodiment of the present invention will be described below with reference to FIGS.

[Overall configuration of combination weighing system 1]
As shown in FIG. 1, the combination weighing system 1 according to the present embodiment measures a product C (see FIG. 2) such as potato chips to be packaged, covers the measured product C with a film, An apparatus for manufacturing a packaged product B by sealing a cylindrical film vertically and horizontally, and mainly includes a combination weighing device 2 and a bag making and packaging machine (packaging device) 3.

  The product C is weighed by a predetermined weight and stored in each hopper in the combination weighing device 2 provided above the bag making and packaging machine 3, and is discharged to a predetermined total weight by counting the number of times. The

  As shown in FIG. 1, the combination weighing device 2 is arranged on an upper portion of a bag making and packaging machine 3 to be described later. After weighing a product C by a predetermined weight in a weighing hopper, these measured values are set to a predetermined total weight. In combination, the products are sequentially discharged and the product C having a predetermined total weight is measured.

  The bag making and packaging machine 3 is a device that uses a film F to bag a product C that has been discharged by a predetermined total weight as a result of the count measurement in the combination weighing device 2. The bag making and packaging machine 3 will be described in detail later.

[Bag making and packaging machine 3]
As shown in FIG. 1, the bag making and packaging machine 3 mainly includes a bag making and packaging unit 5 that is a main body for bagging products C, and a film that supplies the bag making and packaging unit 5 with a film F serving as a bag. And a supply unit 6. Further, operation switches 7 are arranged on the front surface of the bag making and packaging unit 5, and a liquid crystal display 8 showing an operation state is arranged at a position where an operator who operates the operation switches 7 can visually recognize.

  The film supply unit 6 is a unit that supplies a sheet-like film F to the forming mechanism 13 of the bag making and packaging unit 5 described later, and is provided adjacent to the bag making and packaging unit 5 here. Film rolls FR1 and FR2 (see FIG. 3) around which the film F is wound are set in the film supply unit 6, and the film F is fed out from the film rolls FR1 and FR2. The film supply unit 6 will be described in detail later.

  As shown in FIGS. 1 and 2, the bag making and packaging unit 5 includes a forming mechanism 13 for forming a film F fed in a sheet shape into a cylindrical shape, and a cylindrical film F (hereinafter referred to as a cylindrical film). F.) is pulled down, a vertical sealing mechanism 15 that vertically seals (heat seals) the overlapping portion of the tubular film F, and the tubular film F is sealed horizontally. It is comprised from the horizontal seal mechanism 16 which closes the upper and lower ends of a bag, and the support frame 12 which supports each of these mechanisms. A casing 9 is attached around the support frame 12.

[Detailed configuration of bag making and packaging unit 5]
As shown in FIG. 2, the forming mechanism 13 has a tube 13a and a former 13b.

  The tube 13a is a cylindrical member, and the upper and lower ends are open. The product C weighed from the combination weighing device 2 is put into the opening at the upper end of the tube 13a.

  The former 13b is disposed so as to surround the tube 13a. The shape of the former 13b is such that the sheet-like film F sent from the film supply unit 6 is formed into a cylindrical shape when passing between the former 13b and the tube 13a.

  The pull-down belt mechanism 14 is a mechanism that sucks the cylindrical film F wound around the tube 13a and conveys it downward, and mainly includes a driving roller 14a and a driven roller 14b, and a belt 14c having a sucking function. . Here, illustration of a drive motor for rotating the drive roller 14a and the like is omitted.

  The vertical sealing mechanism 15 is a mechanism that heats the overlapping portion of the tubular film F wound around the tube 13a while pressing it against the tube 13a with a constant applied pressure, and seals it vertically. The vertical sealing mechanism 15 includes a heater, a heater belt that is heated by the heater and contacts an overlapping portion of the tubular film F, and the like. Although not shown, the vertical seal mechanism 15 also includes a driving device for moving the heater belt closer to or away from the tube 13a.

  The lateral seal mechanism 16 includes a pair of seal jaws 16a and 16a that incorporate a heater belt and the like, and a drive device that moves the seal jaws 16a and 16a closer to or away from the tubular film F, although not shown. Has been.

  The sealing jaws 16a and 16a are members formed to extend in the left-right direction, and the sealing surfaces of the sealing jaws 16a and 16a are heated by a built-in heater belt or the like. The tubular film F is heat-sealed by being sandwiched between the left and right sealing jaws 16a and 16a.

[Detailed Configuration of Film Supply Unit 6]
As shown in FIG. 3, the film supply unit 6 is a device that supplies the film F to the bag making and packaging unit 5 disposed on the downstream side, and includes a roll attachment portion 17, a cutter 11, and an auto splicer. Part (splicer part) 20, transport mechanism 30, pinch roller (roller pair) 35, and tension roller 40 (see FIG. 7).

(Roll mounting part 17)
As shown in FIG. 3, the roll mounting portion 17 is disposed at the lower portion of the film supply device, and has two shafts (roll support portions) that rotatably support the film roll on which the long film F is wound. 18a and 18b, and shaft drive units (drive units) 19a and 19b (see FIG. 7). In the following description, it is assumed that a supply film roll (supply film roll) FR1 is supported on the shaft 18a, and a backup film roll (replacement film roll) FR2 is supported on the shaft 18b.

  As shown in FIG. 3, the shaft 18 a supports the supply film roll FR <b> 1 that is supplied before the preliminary film roll FR <b> 2 to the bag making and packaging unit 5 in a rotatable state.

  The shaft 18b supports the preliminary film roll FR2 that is used after the film F of the supply film roll FR1 supported by the shaft 18a runs out in a rotatable state.

  The shaft driving units 19 a and 19 b are driving units that rotate the shafts 18 a and 18 b, respectively, and are controlled by the control unit 10.

  In addition, as shown in FIG. 5, in order to arrange the pattern printed on the film F at the same position of the bag to be formed on the film F, a mark M called a registration mark is equally spaced along the longitudinal direction. Is printed. For this reason, the interval between the registration marks M corresponds to the length of the bag. In the bag making and packaging unit 5, by detecting the registration mark M, the horizontal seal, cutting timing, and the like are adjusted. Further, the film supply unit 6 performs a seaming process for joining the end of the supply film F and the start of the spare film using the registration mark M as a mark.

(Cutter 11)
As shown in FIG. 3, the cutter 11 is disposed between the roll attachment portion 17 and the heat seal portion 25 included in the auto splicer portion 20. Then, when the film roll FR1 set on the shaft 18a is a fixed type film roll, the terminal portion of the film F of the film roll FR1 is cut, and the film tube is wound and fixed from the paper tube To separate.

(Auto splicer section 20)
When the supply film roll FR1 supplied to the bag making and packaging unit 5 is exhausted, the auto splicer unit 20 temporarily stops the conveyance of the film F, near the end portion of the film F, and for replacement described later. The film roll FR2 and the vicinity of the start end portion of the film F are heat-sealed and automatically joined together. Thereby, even when the film F of the supply film roll FR1 used previously is lost, the film F can be continuously conveyed by connecting with the film F of the backup film roll FR2. As shown in FIGS. 3 and 4, the auto splicer unit 20 includes a registration mark sensor (registration mark detection unit) 21, a front splicer unit 22, a back splicer unit 23, and a temporary fixing unit 24. The heat seal portion 25, the cylinder 26, and the support plate 28 are included.

  The registration mark sensor 21 is arranged on the most downstream side in the auto splicer unit 20 and can detect the registration mark M printed on the film F described above. Thus, positioning can be performed by stopping the film F being supplied at a predetermined position with reference to the position of the registration mark M.

  As shown in FIG. 3, the front splicer unit 22 conveys the long film F fed from the supply film roll FR1 supported by the shaft 18a upward via the rollers 22e and 22f to the downstream side. (See FIG. 4). Further, as shown in FIG. 4, the front splicer section 22 rotates the main body section 22a around the rotating shaft 22c by gripping the handle 22b and pulling it in a direction away from the back splicer section 23. be able to. Thus, when replacing the supply film roll FR1 and the backup film roll FR2, the workability when setting the film F by opening the front splicer part 22 and the back splicer part 23 is improved. Can be improved. When the main body 22a is rotated, the protrusion 22d fixed to the main body 22a moves along the guide hole 28a formed in the support plate 28, and the lower end of the guide hole 28a is moved at a predetermined angle. The protruding portion 22d contacts the portion. Thereby, rotation of the main-body part 22a can be stopped at a predetermined rotation angle. Further, a heat seal unit 25 described later is disposed above the front splicer unit 22, and the film F fed from the supply film roll FR 1 supported by the shaft 18 a on the upper surface of the front splicer unit 22 is disposed. The joining position in the vicinity of the end portion and the joining position in the vicinity of the starting end of the film F fed from the preliminary film roll FR2 are joined by heat sealing.

  As shown in FIG. 3, the back splicer section 23 conveys the long film F fed from the preliminary film roll FR2 to the upper side on the downstream side via the rollers 23e and 23f (see FIG. 4). . Similarly to the front splicer unit 22, the back splicer unit 23 grips the handle 23b and pulls it away from the front splicer unit 22 as shown in FIG. The main body 23a can be rotated as the center. As in the case of the front splicer unit 22, the front splicer unit 22 and the back splicer unit 23 are opened to change the film when the supply film roll FR1 and the spare film roll FR2 are exchanged. Workability at the time of setting F can be improved. When the main body 23a is rotated, the protrusion 23d fixed to the main body 23a moves along the guide hole 28b formed in the support plate 28, and the lower end of the guide hole 28b is rotated at a predetermined rotation angle. The point that the rotation of the main body portion 22a is stopped at a predetermined angle when the projecting portion 23d contacts the portion is the same as described above.

  As shown in FIG. 4, the temporary fixing portion 24 is disposed on the upper surface of the back splicer portion 23, and is sent out from the preliminary film roll FR <b> 2 between the front splicer portion 22 and the back splicer portion 23. Is provided to temporarily fix the starting end portion of the film F on the upper surface of the back splicer portion 23 via the gap. And the temporary fix | stop part 24 has the rotating shaft 24a and the clip part 24b rotated centering on the rotating shaft 24a. In this embodiment, the registration mark M portion printed on the film F is temporarily fixed so as to be aligned with the clip portion 24b.

  As shown in FIG. 4, the heat seal part 25 is disposed on the upper surface of the front splicer part 22, and a part for heat-sealing the heating part 25 a, that is, a terminal vicinity part of the film F of the supply film roll FR <b> 1. The preliminary film roll FR2 is brought into contact with a portion where the vicinity of the start end portion of the film F is joined while applying a predetermined pressure. Thus, both heat and pressure are applied to the overlapping portion between the vicinity of the end portion of the film F fed from the supply film roll FR1 and the vicinity of the start end portion of the film F fed from the preliminary film roll FR2. Can be easily stitched together.

  As shown in FIG. 4, the cylinder 26 is disposed on the side surface of the back splicer portion 23, and advances an insertion plate (not shown) to the upper surface of the front splicer portion 22. At this time, between the upper surface of the front splicer part 22 and the heat seal part 25, the start end part of the film F of the backup film roll FR2 and the end of the film F of the supply film roll FR1 supported by the shaft 18a. Are inserted together with an insertion plate (not shown). At this time, the film F of the supply film roll FR1 and the film F of the backup film roll FR2 are stopped in a state of being positioned with respect to each other, that is, the film F of the supply film roll FR1 has the registration mark M predetermined. The film F of the preliminary film roll FR2 is positioned by fixing the registration mark M to the temporary fixing portion. Thereby, on the upper surface of the front splicer part 22, the joining position in the vicinity of the starting end of the film F of the preliminary film roll FR2 and the joining position in the vicinity of the end of the film F of the supply film roll FR1 are overlapped. A state can be formed.

  The support plate 28 is a plate material for fixing the auto splicer unit 20 to the support frame 12 on the bag making and packaging unit 5 side, and as shown in FIG. Guide holes 28a and 28b for guiding the 23 protrusions 22d and 23d are formed. Thereby, the auto splicer unit 20 can be disposed immediately upstream of the bag making and packaging unit 5.

(Transport mechanism 30)
As shown in FIG. 4, the transport mechanism 30 includes rollers 30 a, 30 b, 30 c and the like, and transports the film F to the bag making and packaging unit 5 disposed on the downstream side.

(Pinch roller 35)
As shown in FIG. 4, the pinch roller 35 is disposed on the downstream side of the rollers 30 a to 30 c and includes two rollers 35 a and 35 b facing each other. Further, the two rollers 35a and 35b are arranged so as to be able to contact and separate, and can support the film F when they are close to each other (hereinafter referred to as a closed state), and are separated from each other (hereinafter referred to as an open state). In this case, it is retracted to a position where it does not contact the film F.

  A first encoder (feed amount measuring unit) 36 (see FIG. 7) that can calculate the feed amount of the film F based on the rotation of the roller 35a is attached to the roller 35a.

(Tension roller 40)
As shown in FIG. 7, the tension roller 40 is disposed on the downstream side of the pinch roller 35 and measures the tension applied to the film F by applying a certain tension to the film F. The tension can be kept constant by switching the rotation speed of each roller of the transport mechanism 30 to be fed. The tension roller 40 includes a first guide roller 41 for changing the direction, a second guide roller 42, a dancer roller 43, and a second encoder 51.

  As shown in FIG. 6, the dancer roller 43 uses a pair of left and right guide plates 46 in which guide slits 47 extending in the vertical direction are formed, and both side shaft portions 43 a of the dancer roller 43 are inserted into the guide slits 47 and 47. This dancer roller 43 can be moved in the vertical direction. In the example shown in FIG. 6, the dancer roller shaft 43 a protruding from the guide slit 47 of the guide plate 46 is connected to the dancer roller 43 through the bracket 48 as detection means for detecting the vertical displacement of the dancer roller 43. A rack 49 extending in the direction is attached. A pinion 50 that always meshes with the rack 49 is rotatably mounted on a frame (not shown), and a second encoder 51 for detecting the vertical displacement amount of the dancer roller 43 corresponding to the rotation amount is attached to the pinion 50. It is attached. Thereby, the tension | tensile_strength etc. concerning the film F can be monitored based on the amount of displacements of an up-down direction.

[Description of control in splicing process]
Next, regarding the control such as positioning performed by the control unit 10 when joining the vicinity of the end of the film F of the supply film roll FR1 and the vicinity of the start of the film F of the auxiliary film roll FR2 in the auto splicer unit 20. This will be described with reference to FIGS. Here, the control block shown in FIG. 7 can be constructed by the function of computer software or hardware. Which function is realized by software and which function is realized by hardware can be appropriately determined according to the processing capability and the like.

  Note that the film rolls FR1 and FR2 filled in the shafts 18a and 18b are a type in which the fixed type film roll, the end of the film, and the paper tube around which the film is wound are not fixed (hereinafter referred to as a non-fixed type). Since the content of the control is different from that of the film roll of (), each will be described separately here. When the control is actually switched, the type of film roll set on the shaft may be determined and switched automatically, or the user may set the setting in advance.

<When using a fixed film roll>
First, the case where a fixed type film roll is used is demonstrated using FIG.

  In step S <b> 1, the end of the supply film roll FR <b> 1 is detected by the tension roller 40 while the supply mechanism 30 is transporting the film F of the supply film roll FR <b> 1. Specifically, the control unit (end detection unit) 10 monitors the tension applied to the film F from the position of the dancer roller 43 in the vertical direction, and detects the end of the supply film roll FR from the change in tension. Note that when the end of the film roll FR1 is detected, the film F can no longer be sent out from the film roll FR1, and the shaft 18a that rotatably supports the film roll FR1 cannot be rotated. It means that the moment was detected. Further, the control unit 10 detects, for example, that the tension applied to the dancer roller 43 has temporarily increased, and determines that the film roll FR1 has ended.

  In step S <b> 2, the control unit 10 supports the film F by shifting the pinch roller 35 to the closed state. Note that the rotation of the pinch roller 35 in this case is driven and rotated by the winding of the film F by the shaft 18a in step 3. And since the 1st encoder 36 is attached to one roller 35a which forms the pinch roller 35, the feed amount of the film F can be measured based on the rotation amount of the roller 35a.

  In step S3, the control unit 10 calculates a feed amount that can be transported in the direction opposite to the supply direction based on the position in the vertical direction of the dancer roller 43 that forms the tension roller 40. We are monitoring whether we can continue. Thereby, in a state where the film F cannot be wound in the subsequent step S4 or the like, for example, when the feed amount that can be wound is calculated as 0, the operation is stopped or the control method is changed. Is possible.

  In step S4, the control unit 10 drives the shaft driving unit 19a and rotates the shaft 18a in the direction opposite to the direction in which the shaft 18a is sent out in the supply direction (hereinafter referred to as take-up rotation). (Hereinafter referred to as the winding direction).

  In step S5, the registration mark sensor 21 starts monitoring the registration mark M of the film F being conveyed in the winding direction. Here, when the registration mark sensor 21 detects the registration mark M, it transmits a detection signal to the control unit 10 and proceeds to step S6. When the registration mark sensor 21 does not detect the registration mark M, the process proceeds to step S11. Transition.

  In step S <b> 6, when receiving the registration mark M detection signal transmitted from the registration mark sensor 21, the control unit 10 causes the pinch roller 35 to start measuring the film feed amount. As described above, since the first encoder 36 is attached to the roller 35a forming the pinch roller 35, the film feed amount can be measured based on the rotation amount of the roller 35a.

  In step S7, when the film feed amount measured by the pinch roller 35 reaches a predetermined set value, the control unit 10 stops the winding rotation of the shaft 18a by the shaft driving unit 19a. In the present embodiment, the film feed amount after the registration mark sensor 21 detects the registration mark M, that is, the film F is controlled to stop at a position where the registration mark sensor 21 is wound 90 mm. At this time, the film F of the supply film roll FR1 is arranged at a predetermined position in the auto splicer unit 20, that is, a position overlapping the joining position of the film F of the preliminary film roll FR2. The set value of the above-mentioned film feed amount can be arbitrarily set with the operation switch 7 or the like.

  In step S8, the cutter 11 disposed between the roll mounting portion 17 and the heat seal portion 25 cuts the end portion of the film F, and the film is wound and fixed from the paper tube to which the film F is wound. Separate F. As a result, the vicinity of the end portion of the film F of the supply film roll FR1 and the vicinity of the start end portion of the film F of the preliminary film FR2 can be overlaid.

  In step S9, the starting end of the film F of the preliminary film roll FR2 fixed by the clip part 24b of the temporary fixing part 24 is pushed out toward the front splicer part 22 by an insertion plate (not shown). The joining positions of the film F of the film roll FR1 and the film F of the preliminary film roll FR2 are positioned. In the present embodiment, the film F of the supply film roll FR1 is positioned by stopping the registration mark M at a predetermined position, and the film F of the preliminary film FR2 fixes the registration mark M to the temporary fixing portion 24. Is positioned. As a result, it is possible to form a state in which the seaming position in the vicinity of the starting end portion of the film F of the preliminary film roll FR2 and the seaming position in the vicinity of the terminal end portion of the film F of the supply film roll FR1 are overlapped. Then, the heating unit is pressed from above in the vertical direction against the film F of the supply film roll FR1 and the film F of the backup film roll FR2 that are overlapped in the state where the joining positions are matched, and the sealing process is executed. . Thereby, the film F of the supply film roll FR1 and the film F of the backup film roll FR2 are joined together.

  In step S10, the control unit 10 shifts the pinch roller 35 to the opened state again to release the support of the film F. Then, the control unit 10 controls the transport mechanism 30 to transport the film F in the supply direction again.

  As described above, according to the flow shown in step S1 to step S10, the vicinity of the end of the film F of the supply film roll FR1 is automatically joined to the vicinity of the start of the film F of the preliminary film roll FR2, and the conveyance is continued. Is possible.

  Hereinafter, control when the registration mark sensor 21 does not detect the registration mark M in step S5 will be described.

  In step S11, when the control unit 10 determines that no more winding can be performed in the monitoring of the registration mark M in step S3 (hereinafter referred to as a winding limit), the winding direction of the shaft 18a by the shaft driving unit 19a. Stop rotating to.

  In step S12, the control unit 10 causes the transport mechanism 30 to transport the film F in the supply direction again.

  In step S13, the registration mark sensor 21 monitors the registration mark M of the film F being conveyed in the supply direction. Here, when the registration mark sensor 21 detects the registration mark M, it transmits a detection signal to the control unit 10 and proceeds to step S6. When the registration mark sensor 21 does not detect the registration mark M, the process proceeds to step S14. Transition.

  In step S <b> 14, the control unit 10 displays a message indicating that the registration mark M cannot be detected on, for example, a liquid crystal display disposed in the bag making and packaging unit 5.

  As mentioned above, even if it is a case where the film F of the film roll FR1 for supply has reached the winding limit by the flow shown to step S11-step S13, it is a spare film in the terminal part vicinity of the film F of the film roll FR1 for supply. It is possible to continue the conveyance by automatically joining the vicinity of the start end of the film F of FR2.

<When non-fixed type film roll is used>
Next, the case where a non-fixed type film roll is used will be described with reference to FIG. Note that the case where the control unit 10 detects the winding limit is the same as described above, and the description thereof is omitted here.

  In step S21, the end of the supply film roll FR1 is detected by the tension roller 40. Specifically, the content is the same as that shown in step S1.

  In step S22, the control unit 10 shifts the pinch roller 35 to the closed state and pinches the film F. In this case, the pinch roller 35 is rotated by the driving unit 37 (see FIG. 7). Further, since the film F of the supply film roll FR1 is firmly sandwiched between the pair of rollers 35a and 35b constituting the pinch roller 35, it cannot move along the supply direction unless the pair of rollers 35a and 35b rotates. Absent. Thus, when a non-fixed type film roll is used, the film F can be held by the pinch roller 35 even if the end of the film F is separated from the paper tube, so that the tension in the tension roller 40 is kept constant. Can keep. As described above, since the first encoder 36 is attached to the roller 35a forming the pinch roller 35, the film feed amount can be measured based on the rotation amount of the roller 35a.

  In step S23, the control unit 10 calculates a feed amount that can be transported in the direction opposite to the supply direction based on the position in the vertical direction of the dancer roller 43 that forms the tension roller 40. We are monitoring whether we can continue. Thereby, in a state where the film F cannot be wound in the subsequent step S4 or the like, for example, when the feed amount that can be wound is calculated as 0, the operation is stopped or the control method is changed. Is possible.

  In step S <b> 24, the control unit 10 drives the driving unit 37 to rotate the roller 35 b forming the pinch roller 35 and convey it in the winding direction.

  In step S25, the registration mark sensor 21 starts monitoring the registration mark M of the film F being conveyed in the winding direction. Here, when the registration mark sensor 21 detects the registration mark M, it transmits a detection signal to the control unit 10 and proceeds to step S26.

  In step S <b> 26, upon receiving the registration mark M detection signal transmitted from the registration mark sensor 21, the control unit 10 causes the pinch roller 35 to start measuring the film feed amount. As described above, since the first encoder 36 is attached to the roller 35a forming the pinch roller 35, the film feed amount can be measured based on the rotation amount of the roller 35a.

  In step S27, when the film feed amount measured by the pinch roller 35 reaches a predetermined set value, the control unit 10 stops the winding rotation of the roller 35b by the driving unit 37. In the present embodiment, the film feed amount after the registration mark sensor 21 detects the registration mark M, that is, the film F is controlled to stop at a position where the registration mark sensor 21 is wound 90 mm. At this time, the film F of the supply film roll FR1 is arranged at a predetermined position in the auto splicer unit 20, that is, a position overlapping the joining position of the film F of the preliminary film roll FR2. The set value of the above-mentioned film feed amount can be arbitrarily set with the operation switch 7 or the like.

  In step S28, as in step S9, the film F of the supply film roll FR1 and the film F of the backup film roll FR2 are sealed and joined together.

  In step S29, the control unit 10 shifts the pinch roller 35 to the opened state again to release the film F. Then, the control unit 10 controls the transport mechanism 30 to transport the film F in the supply direction again.

  As described above, even if the supply film roll FR1 is a non-fixed type film roll by the flow shown in steps S21 to S29, the film of the backup film roll FR2 is provided near the terminal end of the film F of the supply film roll FR1. It is possible to automatically join the vicinity of the start end portion of F and continue the conveyance.

[Features of combination weighing system 1]
(1)
The combination weighing system 1 of the present embodiment includes a control unit 10 for joining the joining position of the supply film FR1 near the end of the film F to the joining position of the preliminary film FR2 near the start of the film F. However, if the terminal part of the film F of the film roll FR1 being supplied is detected based on the second encoder 51, the control part 10 controls the shaft driving part 19a to rotate the shaft 18a. Then, the control unit 10 controls the shaft driving unit 19a to wind up the film F by 90 mm from the time when the registration mark sensor 21 detects the registration mark M.

  Thereby, for example, even when a fixed type film roll FR1 is used, the remaining amount of the film F in the film roll FR1 is secured to some extent to perform alignment, and unnecessary portions are cut or auto It is not necessary to provide a buffer part between the splicer part 20 and the roll mounting part 17.

  As a result, it is possible to reduce the loss of the film F in the joining process of the film F with a compact configuration.

(2)
In the combination weighing system 1 of the present embodiment, the control unit 10 rotates the shaft driving unit 19a in the direction in which the film F is wound up, and transports the film F in the direction opposite to the supply direction.

  This makes it possible to easily transport the film in the direction opposite to the supply direction. In addition, when the film F is wound by controlling a mechanism other than the shaft driving unit 19a, for example, by controlling the driving unit 37 that drives the pinch roller 35, the sagging of the film F can be prevented.

(3)
The combination weighing system 1 of the present embodiment has a pinch roller 35 formed by a pair of rollers 35a and 35b that sandwich the film F, and the control unit 10 is in a direction opposite to the direction of rotation in the supply direction. The rollers 35a and 35b are rotated to convey the film F in the direction opposite to the supply direction.

  Thereby, even if it is a case where the non-fixed type film roll FR1 is used, it becomes possible to convey the film F in the direction opposite to a supply direction.

(4)
In the combination weighing system 1 of the present embodiment, the film feed amount is measured by the first encoder 36 that is attached to the roller 35a and detects rotation.

  Thereby, when positioning with respect to the joining position, positioning can be performed flexibly, for example, by positioning at a predetermined distance from the position of the registration mark M.

(5)
The combination weighing system 1 of the present embodiment includes a tension roller 40 that is arranged on the downstream side of the auto splicer unit 20 so as to be movable in a substantially vertical direction and applies a predetermined tension to the film F, and includes a control unit. 10 determines whether or not the film F can be rewound from the position in the vertical direction of the dancer roller 43 forming the tension roller 40.

  Thereby, when there is no film F which can be sent in the winding direction, it is possible to perform control to send the film F again in the supply direction.

(6)
In the combination weighing system 1 of this embodiment, the tension roller 40 is used to detect the end of the supply film roll FR1.

  This makes it possible to easily detect the end of the supply film roll FR1 without separately providing a sensor or the like for detecting the end of the supply film roll FR1.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the combination weighing system 1 of the above embodiment, after the control unit 10 detects the end of the film F of the film roll FR1 being supplied based on the second encoder 51 and the registration mark sensor 21 detects the registration mark M, The film F has been described with an example in which the film F is wound by 90 mm in the winding direction for positioning. However, the present invention is not limited to this.

  For example, the length of the film F to be wound may be a value other than 90 mm, or the winding length may be 0, and can be adjusted according to the registration mark M printed on the film F.

(B)
In the combination weighing system 1 of the above-described embodiment, when the fixed type film roll is used, the shaft 18a is rotated in the winding direction, and the film F of the supply film FR1 is wound up. However, the present invention is not limited to this.

  For example, even when a fixed type film roll is used, the film F of the supply film may be wound up by driving a roller that forms a pinch roller. However, it is desirable to perform the control described in the embodiment, considering that the film can be prevented from sagging between the pinch roller and the shaft by rotating the shaft in the winding direction.

(C)
In the combination weighing system 1 of the above embodiment, the example in which the first encoder 36 is attached to the roller 35a has been described in order to measure the feed amount of the film F of the supply film roll FR1. However, the present invention is not limited to this.

  For example, an encoder may be attached to a roller that forms a transport mechanism, a shaft to which a film roll is attached, or the like.

(D)
In the combination weighing system 1 of the above embodiment, the control unit 10 has been described with an example in which the end of the supply film roll FR1 is detected from the change in tension detected by the tension roller 40. However, the present invention is not limited to this.

  For example, the end of the film roll may be detected from the change in rotation of the shaft to which the film roll is attached, or the end of the film roll may be detected by a sensor or the like that can directly detect the presence or absence of the film.

(E)
In the combination weighing system 1 of the above embodiment, the control unit 10 calculates a feed amount that can be conveyed in the direction opposite to the supply direction based on the position of the dancer roller 43 that forms the tension roller 40 in the vertical direction. An example of monitoring whether the conveyance can be continued has been described. However, the present invention is not limited to this.

  The control unit may set a threshold value at a position in the vertical direction of the dancer roller that forms the tension roller, and monitor whether or not the conveyance can be continued.

(F)
In the combination weighing system 1 of the above-described embodiment, an example in which the supply film roll FR1 is inserted into the shaft 18a and the preliminary film roll FR2 is inserted into the shaft 18b has been described. However, the present invention is not limited to this.

  The preliminary film roll FR2 may be mounted on the shaft 18a, and the film roll FR1 may be mounted on the shaft 18b. At this time, it can be realized by providing a temporary fixing portion on the upper surface of the front splicer portion.

  According to the present invention, it is possible to automatically connect and continuously supply a film wound in a roll shape, so that it can be widely applied as an apparatus for supplying a film to various apparatuses that use the film as a material. Is possible.

1 is an external view of a combination weighing system including a film supply apparatus according to an embodiment of the present invention. The perspective view which shows the structure of the bag making packaging unit contained in the combination measurement system 1 of FIG. The front view which shows the structure of the film supply unit contained in the bag making packaging machine of the combination measurement system of FIG. The front view which shows the structure of the auto splicer part contained in the film supply unit of FIG. Explanatory drawing which shows the registration mark of a film roll. The front view which shows the structural example of the tension roller contained in the film supply unit of FIG. The control block diagram which comprises the film supply apparatus of FIG. The flowchart which showed the flow of the positioning control at the time of using a fixed type film roll in this embodiment. The flowchart which showed the flow of the positioning control at the time of using a non-fixed type film roll in this embodiment.

Explanation of symbols

1 Combination Weighing System 2 Combination Weighing Device 3 Bag Making and Packaging Machine (Packaging Device)
5 Bag making and packaging unit 6 Film supply unit (film supply device)
7 Operation switches 8 Liquid crystal display 9 Casing 10 Control unit (control unit, end detection unit)
11 Cutter 12 Support frame 13 Forming mechanism 13a Tube 13b Former 14 Pull-down belt mechanism 14a Drive roller 14b Follower roller 14c Belt 15 Vertical seal mechanism 16 Horizontal seal mechanism 16a Seal jaw
17 Roll mounting part 18a, 18b Shaft (roll support part)
19a, 19b Shaft drive part (drive part)
20 Auto-splicer section (splicer section)
21 Registration Mark Sensor (Registration Mark Detection Unit)
22 Front Splicer Part 22a Body Part 22b Handle 22c Rotating Shaft 22d Projecting Part 22e, 22f Roller 23 Back Splicer Part 23a Body Part 23b Handle 23c Rotating Shaft 23d Projecting Part 23e, 23f Roller 24 Temporary Fixing Part 24a Rotating Shaft 24b Clip part
25 Heat seal part 25a Heating part 26 Cylinder 28 Support plate 28a, 28b Guide hole 30 Transport mechanism 30a-30c Roller 35 Pinch roller (roller pair)
35a, 35b Roller 36 First encoder (feed amount measuring unit)
37 Drive unit 40 Tension roller 41 First guide roller 42 Second guide roller 43 Dancer roller 43a Dancer roller shaft 46 Guide plate 47 Guide slit 48 Bracket 49 Rack 50 Pinion 51 Second encoder F Film FR1 Supply film roll Film roll)
FR2 Preliminary film roll (replacement film roll)
M cashier mark

Claims (9)

A plurality of film rolls around which a long film is wound are supported in a rotatable state, and the film of one of the film rolls is transported to the downstream side while being fed out of the film roll. When there is no film, it is a film supply apparatus that seams and conveys the vicinity of the start end of the film sent from the other film roll and the vicinity of the end of the film sent from the one film roll,
A roll support part for rotatably supporting the film roll for supply and the film roll for replacement;
A transport mechanism for transporting the film in the supply direction;
An end detection unit for detecting the end of the film roll for supply;
A splicer portion that joins the vicinity of the end portion of the film for supply and the vicinity of the start end portion of the film for replacement;
A registration mark detector for detecting registration marks printed on the film;
When the end detection unit detects the end of the film roll, the film is transported in a direction opposite to the supply direction, and positioning with respect to the replacement film is performed based on a detection result in the registration mark detection unit. A control unit for controlling the transport mechanism;
A film supply apparatus. The transport mechanism includes a drive unit that rotates the roll support unit;
The control unit performs the positioning by controlling the driving unit.
The film supply apparatus according to claim 1. The transport mechanism has a roller pair formed by a pair of rollers that sandwich the film,
The controller performs the positioning by rotating the roller pair.
The film supply apparatus according to claim 1 or 2. A feed amount measuring unit that measures a feed amount that is a moving distance along the conveyance direction of the film;
The film supply apparatus of any one of Claim 1 to 3. The feed amount measuring unit calculates the feed amount based on rotation of the rollers forming the roller pair;
The film supply apparatus according to claim 4. A tension roller that is arranged on the downstream side of the splicer part so as to be movable in a substantially vertical direction, and further applies a predetermined tension to the film;
The control unit calculates a feeding amount of a film to be conveyed in a direction opposite to the supply direction based on a position of the tension roller in a vertical direction.
The film supply apparatus of any one of Claim 1 to 5. The end detection unit detects the end of the film roll based on the position of the tension roller in the vertical direction.
The film supply apparatus according to claim 6. The film roll has an end portion of the film and a paper tube around which the film is wound fixed.
The film supply apparatus of any one of Claim 1 to 7.   The packaging apparatus provided with the film supply apparatus of any one of Claims 1-8.

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