JP7323152B2 - packaging equipment - Google Patents

Description

The present invention relates to packaging equipment.

As a packaging device, a rotating shaft to which a film roll around which a film is wound is attached, a conveying unit that pulls out and conveys the film from the film roll attached to the rotating shaft, and a cutting unit that cuts the film conveyed by the conveying unit. and a packaging unit for packaging an object with a cut film (see Patent Document 1, for example).

Japanese Patent No. 4975984

In the packaging apparatus as described above, there are cases where the rotating shaft is rotationally driven in order to assist the drawing of the film by the conveying section. In this case, it is necessary to adjust the rotational speed of the rotating shaft in accordance with the current diameter of the film roll in order to set the amount of film pulled out by the rotation of the rotating shaft to the target amount. Therefore, it is required to accurately grasp the diameter of the current film roll. Alternatively, the current film roll diameter can be used, for example, to know when to change the film roll. For this reason as well, it is required to accurately grasp the diameter of the current film roll.

As a method for calculating the diameter of the film roll, it is conceivable to use a sensor to detect the amount of rotation of the rotating shaft when a film of a predetermined length is pulled out, and to calculate the current diameter of the film roll based on the detection result. However, simply implementing such a method may cause the film to stretch between the rotating shaft and the conveying section, making it impossible to accurately calculate the current diameter of the film roll.

SUMMARY OF THE INVENTION An object of the present invention is to provide a packaging apparatus capable of accurately grasping the diameter of a current film roll.

The packaging apparatus of the present invention includes a rotary shaft to which a film roll around which a film is wound is attached, a detection unit that detects the amount of rotation of the rotary shaft, and a conveyer that pulls out and conveys the film from the film roll attached to the rotary shaft. a cutting unit that cuts the film conveyed by the conveying unit; a packaging unit that wraps the object with the cut film; and a control unit that performs control according to the operation mode, and the operation mode is a normal operation mode in which the film is conveyed at a first speed by the conveying unit, and a rotation amount of the rotating shaft is detected by the detecting unit during the film is conveyed at a second speed lower than the first speed by the conveying unit. and a reduced speed mode.

In this packaging apparatus, in the speed reduction mode, the amount of rotation of the rotary shaft is detected while the film is conveyed at a second speed that is lower than the first speed at which the film is conveyed in the normal operation mode. As a result, it is possible to detect the amount of rotation of the rotating shaft in a state in which the elongation of the film is suppressed, and as a result, it is possible to accurately grasp the current diameter of the film roll.

The controller may calculate the current diameter of the film roll based on the amount of rotation of the rotating shaft detected in the speed reduction mode. In this case, the diameter of the current film roll can be calculated with high accuracy.

The packaging apparatus of the present invention further comprises a drive section for rotating the rotating shaft, and in the normal operation mode, the control section controls the current film roll grasped using the rotation amount of the rotating shaft detected in the speed reduction mode. The driving section may be controlled so that the rotating shaft rotates at a rotation speed corresponding to the diameter. In this case, the rotation shaft can be rotated at a rotation speed corresponding to the diameter of the current film roll.

In the normal operation mode, the control unit may control the driving unit such that the speed at which the film is sent out from the film roll due to the rotation of the rotating shaft is slower than the first speed at which the film is conveyed by the conveying unit. . In this case, an appropriate tension can be applied to the film between the rotating shaft and the conveying section. In addition, it is possible to suppress the occurrence of backlash caused by excessive rotation of the film roll.

In the speed reduction mode, the process of detecting the rotation amount of the rotating shaft is performed a plurality of times while the film is being conveyed at the second speed. The speed at which the film is sent out from the film roll by the rotation of the rotating shaft may be adjusted based on the detection result of the amount of rotation of the rotating shaft in the (N-1)th process. In this case, it is possible to grasp the diameter of the current film roll with higher accuracy.

In the speed reduction mode, the process of detecting the amount of rotation of the rotating shaft is performed a plurality of times while the film is being transported at the second speed, and the control unit detects the average value of the amount of rotation of the rotating shaft in the multiple times of processing. may be calculated. In this case, it is possible to grasp the diameter of the current film roll with much higher accuracy.

The control unit may set the speed at which the film is transported by the transport unit in the Nth process to a speed higher than the speed at which the film is transported by the transport unit in the N-1th process. In this case, the time required to detect the amount of rotation of the rotating shaft can be shortened.

When acquiring the rotation amount of the rotation shaft, the control unit excludes the rotation amount of the rotation shaft detected in the first processing, and acquires the rotation amount of the rotation shaft detected in the second and subsequent processing. good too. In this case, it is possible to grasp the diameter of the current film roll with much higher accuracy. This is because there may be slack in the film between the rotating shaft and the conveying unit at the time of the first processing, and the detection result in the first processing may contain an error.

The packaging apparatus of the present invention further includes a storage unit that stores the diameter of the film roll at the time of the previous stop of operation, and the control unit stores the amount of rotation of the rotating shaft detected in the speed reduction mode and the film roll at the time of the previous stop of operation. It may be determined whether the film roll attached to the rotating shaft is the film roll at the time when the operation was stopped last time, based on the diameter of . In this case, it is possible to accurately determine whether or not the film roll attached to the rotating shaft is the film roll at the time when the operation was stopped last time.

The packaging apparatus of the present invention further comprises a storage unit that stores the diameter of the film roll before use, and the control unit stores the rotation amount of the rotation shaft detected in the speed reduction mode and the diameter of the film roll before use. , it may be determined whether the film roll attached to the rotating shaft is a film roll before use. In this case, it is possible to accurately determine whether the film roll attached to the rotating shaft is a film roll before use.

The control unit slows down the operation mode at least one of when the operation is started, when the packaging unit wraps the object a predetermined number of times, when a predetermined amount of film is used, and when the film roll is replaced. mode can be set. In this case, the current diameter of the film roll can be accurately grasped at least one of these times.

ADVANTAGE OF THE INVENTION According to this invention, the packaging apparatus which can grasp|ascertain the diameter of the present film roll accurately can be provided.

FIG. 1 is a perspective view showing a packaging device according to one embodiment. 2 is a front view showing the inside of the packaging apparatus of FIG. 1. FIG. 3 is a view taken along line III--III in FIG. 2. FIG. FIG. 4 is a plan view of the packaging device. FIG. 5 is a block diagram showing the configuration of the packaging apparatus of FIG. 1. As shown in FIG. 6(a) to 6(c) are perspective views showing the film delivery mechanism. FIG. 7 is a diagram showing a loading unit. FIG. 8 is a perspective view showing the film delivery mechanism, cutter mechanism and film transport mechanism. FIG. 9 is a diagram showing the first feeder unit. FIG. 10 is a flow chart showing processing in the packaging device.

An embodiment of the present invention will be described in detail below with reference to the drawings. In the following description, the same reference numerals are used for the same or corresponding elements, and overlapping descriptions are omitted.
[Configuration of packaging device]

The packaging apparatus 1 shown in FIGS. 1 to 3 performs film packaging of an object W including a product G such as food and a tray T on which the product G is placed. The packaging apparatus 1 wraps the object W with the film F by pushing up the object W against the film F held under tension and folding the peripheral portion of the film F into the bottom side of the tray T. As shown in FIG. In addition to the film packaging function, the packaging device 1 has a weighing function and a pricing function by attaching a label.

The packaging device 1 includes a weighing-in mechanism 2, a packaging station 3, a roll holding mechanism 4, a film feeding mechanism 5, a film conveying mechanism (conveying section) 6, a cutter mechanism (cutting section) 7, and a sealing mechanism 8. , a label printer LP, a label issuing machine LI, and a control device 9 . Each mechanism included in the packaging device 1 is housed in a main body 1a and a casing 1b of the packaging device 1. As shown in FIG. The casing 1b is attached to the side of the main body 1a.

In the description of the present embodiment, "left and right" mean left and right when viewed from the front of the main body 1a of the packaging device 1. As shown in FIG. The front side of the packaging device 1 in the front-rear direction is called the "front side", and the opposite side is called the "back side". Films F1 and F2 refer to any one of film F1 and film F2, and are also simply referred to as film F. The film rolls R1 and R2 mean any one of the film roll R1 and the film roll R2, and are also simply referred to as the film roll R. "Upstream" and "downstream" mean upstream and downstream in the transport direction of the film F, respectively.

As shown in FIG. 3, the weighing-in mechanism 2 has a scale 2a, a carry-in belt 2b, and a weighing pan 12. As shown in FIG. The weighing scale 2 a weighs the object W placed on the weighing pan 12 and outputs information indicating the weight of the object W to the control device 9 . The carry-in belt 2b is stretched between a pair of rollers. A transport bar 13 for transporting the object W is provided on the carry-in belt 2b. The transport bar 13 moves to the back side in accordance with the drive of the carry-in belt 2b, and pushes the object W to the back side. The transport bar 13 extends along the width direction of the weighing pan 12 and is positioned closer to the front than the weighing pan 12 at the initial position. The weighing plate 12 is a shallow rectangular tray on which the object W is placed.

The packaging station 3 is a space formed within the main body 1a. The packaging station 3 is a space in which the object W weighed by the weighing-in mechanism 2 is subjected to a series of film packaging processes. A lifter mechanism 30 and a folding mechanism 37 are arranged in the packaging station 3 .

A lifter mechanism 30 is provided below the packaging station 3 . The lifter mechanism 30 receives the bottom surface of the tray T with a plurality of support members 33 and moves the support base 31 fixed to the support members 33 upward by the electric ball screw mechanism 34 . Thereby, the lifter mechanism 30 holds the bottom surface of the tray T and moves the object W upward. The lifter mechanism 30 pushes up the object W against the films (stretch films) F1 and F2 that are tension-held by the film transport mechanism 6 .

The folding mechanism 37 folds the surrounding portions of the films F1 and F2 onto the bottom side of the object W pushed up by the lifter mechanism 30 (that is, the bottom side of the tray T) to cover the object W with the films F1 and F2. The folding mechanism 37 folds both ends of the films F1 and F2 in the film transport direction toward the bottom surface of the tray T by the left and right folding plates 76 and 77 . The folding mechanism 37 folds the rear side portions of the films F1 and F2 in the width direction onto the bottom side of the tray T by means of the rear folding plate 78 . The folding mechanism 37 folds the front side portions of the films F1 and F2 in the width direction to the bottom side of the tray T by the front folding bar 79 when the tray T is discharged to the sealing mechanism 8 side by the discharge pusher 79a.

The roll holding mechanism 4 is installed in the casing 1b, as shown in FIGS. The roll holding mechanism 4 has a configuration for holding two film rolls R1 and R2 of the same type or different types. Each of the film rolls R1 and R2 is configured by, for example, multiple windings of films F1 and F2 having a predetermined width around a cylindrical core. The films F1 and F2 are made of, for example, a resin material and have elasticity. For example, 1200 m or 1500 m of film F is wound on film rolls R1 and R2 before use (new, unused). The film rolls R1 and R2 before use can be regarded as having a constant diameter.

As shown in FIG. 2, the roll holding mechanism 4 includes an upper roll holding portion 41 that holds the film roll R1, a lower roll holding portion 42 that holds the film roll R2, the upper roll holding portion 41 and the lower roll holding portion 41. and a roll drive unit 43 that selectively rotates the holding unit 42 to let out the film F1 or the film F2 from one of the film rolls R1 and R2.

The roll driving section 43 includes a driving motor (driving section) 43a. The upper roll holding portion 41 has a rotating shaft 44a that is rotated by the driving force of the drive motor 43a. The rotating shaft 44a is connected to a pulley 43b of the roll driving section 43 via a belt 45a. A film roll R1 is attached to the rotating shaft 44a. The lower roll holding portion 42 has a rotating shaft 44b that is rotated by the driving force of the driving motor 43a. The rotating shaft 44b is connected to a pulley 43c of the roll driving section 43 via a belt 45b. A film roll R2 is attached to the rotating shaft 44b. The rotation of the rotary shafts 44a and 44b by the drive motor 43a assists the drawing of the film F by the film conveying mechanism 6. As shown in FIG.

The packaging device 1 further includes a detector (detector) 46 that detects the amount of rotation of the rotary shafts 44a, 44a (see FIG. 5). The detectors 46 are, for example, two rotary encoders respectively provided on the rotating shafts 44a and 44b. Alternatively, the detector 46 may be provided on the rotary shaft of the drive motor 43a to detect the amount of rotation of the rotary shaft of the drive motor 43a. Even in this case, the amount of rotation of the rotary shafts 44a and 44b can be detected based on the amount of rotation of the rotary shaft of the drive motor 43a and the gear ratio between the drive motor 43a and the rotary shafts 44a and 44b. The amount of rotation detected by the detector 46 may be the magnitude of the rotation angle (integrated value) or the rotation speed (instantaneous value). In the following description, any one of the rotating shafts 44a and 44b will be simply referred to as the rotating shaft 44 as well.

The film delivery mechanism 5 is a mechanism that delivers the film F1 pulled out from the film roll R1 or the film F2 pulled out from the film roll R2 to the feeder units 61 and 62 of the film transport mechanism 6 . A film feeding mechanism 5 is installed in the casing 1b.

The film delivery mechanism 5 includes a loading unit moving frame 51, a loading unit 70, and a loading unit drive motor 52 (see FIG. 2), as shown in FIGS. 6(a) to 6(c).

The loading unit moving frame 51 is arranged above the casing 1b (above the roll holding mechanism 4). The loading unit moving frame 51 rotatably supports a loading unit rotating shaft 70a, which will be described later. The loading unit moving frame 51 is provided movably in the horizontal direction by a link mechanism. Specifically, the loading unit moving frame 51 moves between a first position farthest from the film transport mechanism 6 and a second position closest to the film transport mechanism 6 .

The loading unit 70 is attached to the loading unit moving frame 51 . The loading unit 70 has a first gripping unit 71, a second gripping unit 72, and a loading unit rotating shaft 70a.

As shown in FIG. 7, the first gripping unit 71 and the second gripping unit 72 are attached to the loading unit rotating shaft 70a. The first gripping unit 71 and the second gripping unit 72 are arranged at symmetrical positions with respect to the reference line L. As shown in FIG. The reference line L is a straight line virtually extending along the height direction of the loading unit moving frame 51 from the center of the loading unit rotation shaft 70a. The first gripping unit 71 and the second gripping unit 72 present a V shape.

The first gripping unit 71 has two plate members 71a and 71b and a one-way roller 71c. One ends of the two plate members 71a and 71b are connected to each other by a hinge (not shown). As shown in FIG. 4, the plate member 71b is provided so as to rotate with respect to the plate member 71a about the hinge and be openable and closable with respect to the plate member 71a. The one-way roller 71c is a roller that allows rotation in only one direction (arrow A1 direction in FIG. 7). A plurality of one-way rollers 71c are provided along the longitudinal direction (film width direction) of the plate member 71a. The one-way roller 71c holds the film F1 sandwiched between the plate members 71a and 71b so that the film F1 does not drop downward.

As shown in FIG. 7, the second gripping unit 72 has two plate members 72a and 72b and a one-way roller 72c. One ends of the two plate members 72a and 72b are connected to each other by a hinge (not shown). As shown in FIG. 4, the plate member 72b is provided so as to rotate relative to the plate member 72a about the hinge and to be opened and closed with respect to the plate member 72a. The one-way roller 72c is a roller that allows rotation in only one direction (arrow A1 direction in FIG. 7). A plurality of one-way rollers 72c are provided along the longitudinal direction (film width direction) of the plate member 72a. The one-way roller 72c holds the film F2 sandwiched between the plate members 72a and 72b so that the film F2 does not drop downward.

The first gripping unit 71 and the second gripping unit 72 are selectively used depending on the type of film to be used (film F1 or film F2). The first gripping unit 71 is a unit that grips the film F1. The second gripping unit 72 is a unit that grips the film F2. The first gripping unit 71 and the second gripping unit 72 have a predetermined length in the depth direction of the casing 1b so that the films F1 and F2 can be sent out.

The loading unit rotating shaft 70a is rotatably supported by the loading unit moving frame 51. As shown in FIG. The loading unit rotating shaft 70a is driven by a loading unit drive motor 52 (see FIG. 2). By changing the rotation angle of the loading unit rotating shaft 70a, the loading unit 70 changes its attitude as shown in FIGS. 6(a) to 6(c).

As shown in FIG. 6A, the loading unit 70 causes the first gripping unit 71 to grip the film F1 or the second gripping unit 72 to grip the film F2. and the second gripping unit 72 is positioned symmetrically with respect to the reference line L (loading position).

As shown in FIG. 6B, when the first gripping unit 71 transfers (delivers) the film F1 to the film transport mechanism 6, the loading unit 70 is arranged such that the first gripping unit 71 is parallel to the horizontal plane. (feeding position). As a result, the film F<b>1 is sent horizontally from the leading end of the first gripping unit 71 to the film transport mechanism 6 .

As shown in FIG. 6(c), when the second gripping unit 72 transfers the film F2 to the film transport mechanism 6, the loading unit 70 is rotated until the second gripping unit 72 becomes parallel to the horizontal plane. Can be tilted (feeding position). As a result, the film F<b>2 is sent horizontally from the leading end of the second gripping unit 72 to the film transport mechanism 6 .

As shown in FIGS. 2 and 3 , the film transport mechanism 6 receives the film F from the film delivery mechanism 5 and transports the film F to the packaging station 3 . Also, the film transport mechanism 6 holds the film F received from the film delivery mechanism 5 under tension at the central portion of the packaging station 3 . The film transport mechanism 6 includes a first feeder unit 61 , a second feeder unit 62 , a first feeder moving unit 63 , a second feeder moving unit 64 and a feeder drive unit 65 .

As shown in FIG. 4, the first feeder unit 61 is arranged on the front side of the packaging apparatus 1 in the front-rear direction. The second feeder unit 62 is arranged on the far side in the front-rear direction of the packaging apparatus 1 relative to the first feeder unit 61 . The first feeder unit 61 and the second feeder unit 62 are arranged along the longitudinal direction of the film F. As shown in FIG. The first feeder unit 61 and the second feeder unit 62 are driven by a feeder driving unit 65 to convey the film F. As shown in FIG.

Slide shafts 66 and 67 extending in the width direction of the film F are provided at both ends of the first feeder unit 61 and the second feeder unit 62 in the longitudinal direction, as shown in FIG. Slide shafts 66 and 67 support the first feeder unit 61 and the second feeder unit 62 . The first feeder unit 61 and the second feeder unit 62 are driven by the first feeder moving unit 63 and the second feeder moving unit 64, respectively, and move along the slide shafts 66, 67 in the film width direction.

The first feeder unit 61 and the second feeder unit 62 have similar configurations. An example of the configuration of the first feeder unit 61 will be specifically described below with reference to FIGS. 8 and 9. FIG.

The first feeder unit 61 has an introduction unit (first clamp section) 22A, a lower belt 23A, an upper belt 24A, an upstream area clamp 25A, a middle area clamp 26A, and a downstream area clamp 27A. These are supported by frame 21 . The lower belt 23A and the upper belt 24A constitute a first feeder section that conveys the film F. As shown in FIG.

The introduction unit 22A nips the film F delivered from the film delivery mechanism 5 and introduces the film F between the lower belt 23A and the upper belt 24A. The introduction unit 22A is arranged on the upstream side of the first feeder unit 61, that is, near the loading unit 70 (see FIG. 8). As shown in FIG. 9(c), the introduction unit 22A is provided at a position overlapping the lower belt 23A.

The introduction unit 22A has a body portion 22c that is swingably provided around an introduction unit rotating shaft 22b. The introduction unit rotating shaft 22b is provided at the downstream end of the main body 22c. The introduction unit rotating shaft 22 b is supported by the frame 21 . The body portion 22c is swung by actuation of a solenoid (not shown). Specifically, the main body portion 22c is moved to a lower position where the upstream end of the main body portion 22c approaches the lower belt 23A and a lower position where the upstream end of the main body portion 22c is separated from the lower belt 23A by actuation of the solenoid. It swings in the range between the upper position and the upper position. The introduction unit 22A pinches the film F when the body portion 22c is at the lower position, and does not pinch the film F when the body portion 22c is at the upper position.

A lead-in pulley 22a is rotatably provided at the other end of the body portion 22c (the end on the film delivery mechanism 5 side). An upper belt 24A is wrapped around the introduction pulley 22a.

The lower belt 23A contacts the film F from below. The lower belt 23A is stretched over a plurality of pulleys as shown in FIG. 9(b). The plurality of pulleys includes pulley 21b and pulley 21c. The pulley 21b is arranged on the upstream side of the film F in the transport direction. The pulley 21c is arranged downstream of the film F in the transport direction. The pulley 21c is rotated by a drive motor. The pulley 21b rotates following the pulley 21c. As the pulley 21c is driven by the drive motor, the lower belt 23A of the first feeder unit 61 is operated.

The upper belt 24A is stretched over a plurality of pulleys as shown in FIG. 9(b). The plurality of pulleys includes the introduction pulley 22a of the introduction unit 22A and the pulley 24a. The pulley 24a is arranged downstream of the film F in the transport direction. Pulley 24a is rotated by a drive motor that rotates pulley 21c. Thereby, the upper belt 24A drives together with the lower belt 23A. With the above configuration, the first feeder unit 61 winds the film F between the upper belt 24A and the lower belt 23A, and conveys the film F in the longitudinal direction of the film F that is fed out.

As shown in FIG. 9C, the upstream clamp 25A is arranged on the upstream side of the film F in the transport direction. The downstream clamp 27A is arranged downstream of the film F in the transport direction. Midstream clamp 26A is positioned between upstream clamp 25A and downstream clamp 27A. Each of the clamps 25A-27A is arranged at a position offset from the belts 23,24. Specifically, each of the clamps 25A to 27A is arranged inside the belts 23 and 24 with respect to the width direction of the film F. As shown in FIG. A band plate 21a is arranged below each of the clamps 25A to 27A.

Each of the clamps 25A-27A is operated by switching on/off a solenoid (not shown). Specifically, each of the clamps 25A to 27A clamps the film F or releases the film F by switching the solenoid on/off. Each clamp 25A-27A contacts the upper surface of the film F1, F2 and applies a downward force when the solenoid is on. As a result, each of the clamps 25A to 27A clamps the film F with the band plate 21a. Each clamp 25A-27A releases the film F from its clamping when the solenoid is turned off. The solenoid is switched on at a predetermined timing.

The second feeder unit 62 has a configuration similar to that of the first feeder unit 61 . That is, the second feeder unit 62 has an introduction unit (second clamp section) 22B, a lower belt 23B, an upper belt 24B, an upstream area clamp 25B, a middle area clamp 26B, and a downstream area clamp 27B. These are supported by frame 21 . The lower belt 23B and the upper belt 24B constitute a second feeder section that conveys the film F. As shown in FIG.

The first feeder moving unit 63 is attached below the first feeder unit 61 . As shown in FIG. 3, the first feeder moving unit 63 has a drive motor 63a and a belt 63b. A second feeder moving unit 64 is mounted below the second feeder unit 62 . As shown in FIG. 3, the second feeder moving unit 64 has a drive motor 64a and a belt 64b.

The first feeder moving unit 63 moves the first feeder unit 61 in the width direction of the film F along the slide shafts 66 and 67 by driving the belt 63b with the drive motor 63a. The second feeder moving unit 64 moves the second feeder unit 62 in the width direction of the film F along the slide shafts 66 and 67 by driving the belt 64b with the drive motor 64a.

As shown in FIG. 2, the cutter mechanism 7 cuts the film F stretched between the film delivery mechanism 5 and the film transport mechanism 6 after the film delivery mechanism 5 delivers the film F to the film transport mechanism 6. do. The cutter mechanism 7 cuts the film F stretched between the film delivery mechanism 5 and the film transport mechanism 6 after the film transport mechanism 6 transports the film F by a predetermined amount. The cutter mechanism 7 is arranged between the film delivery mechanism 5 and the film transport mechanism 6 and has a cutting edge 7a longer than the film width of the film F. The cutting blade 7a is vertically moved by an actuator.

The sealing mechanism 8 heat seals the film F folded by the folding mechanism 37 . The sealing mechanism 8 has a conveying roller and a heating roller, and heat seals the object W pushed out by the ejection pusher 79a while conveying the object W by the conveying roller and the heating roller. The sealing mechanism 8 discharges the wrapped object W toward the discharge table 82 .

The label printer LP prints information on articles on labels. The information about the article is, for example, the product name and price. The label issuing machine LI affixes the label printed by the label printer LP to the discharged packaged product.

The control device 9 is a computer arranged on the upper part of the main body 1a. The control device 9 controls the operation of each element that configures the packaging device 1 . The control device 9 includes an input/output interface I/O for inputting/outputting signals with the outside, a ROM (Read Only Memory) storing programs and information for processing, and a RAM temporarily storing data. (Random Access Memory), a storage medium such as an HDD (Hard Disk Drive), a CPU (Central Processing Unit), a communication circuit, and the like. Based on the signal output by the CPU, the control device 9 stores the input data in the RAM, loads the program stored in the ROM into the RAM, and executes the program loaded in the RAM, thereby the packaging device 1 realize each function of

A display panel (abnormality notification unit) 16 and an operation unit 17 are connected to the control device 9 . The display panel 16 is, for example, a touch panel display, and various information and operation buttons are displayed on the display. Various operations and inputs are performed by the user on the operation unit 17 .

The control device 9 includes a control section 91 and a storage section 92 . The storage unit 92 stores various types of preset data input from the display panel 16, the operation unit 17, or the like, or transferred from an external device. The various data include data on properties (thickness, material, film width, etc.) of multiple types of film F, data on unit prices and properties of multiple types of products G, data on properties of multiple types of trays T (size, shape, etc.). , material, tare weight, etc.). The various data further include the diameter of the film roll R when the operation was last stopped, the diameter of the film roll R before use, and each setting value described later.

A control unit 91 controls the operation of each mechanism. The control unit 91 executes control according to operation modes, which will be described later. The control device 9 refers to various data in the storage unit 92 and calculates the price of the object W based on the weight and/or tray size of the object W weighed by the weighing-in mechanism 2 . The control device 9 controls the operations of the label printer LP and the label issuing machine LI, and prints the weight, price, etc. of the object W on the label.

The control device 9 controls the operation of the packaging mechanism (packaging unit) 10 according to the tray size of the object W, and performs film packaging according to the tray size. The packaging mechanism 10 is a mechanism related to film packaging of the object W, and includes at least a lifter mechanism 30 , a folding mechanism 37 , and a sealing mechanism 8 . The amount of film F used for one film packaging is, for example, about 360 mm to 700 mm.
[Outline of operation of packaging machine]

In the packaging apparatus 1, when the user places an object W on the weighing pan 12 of the weighing-in mechanism 2, the object W is weighed by the scale 2a. The object W is pushed onto the support member 33 of the lifter mechanism 30 by the carrier bar 13 . On the other hand, the film feeding mechanism 5 delivers the film F to the film conveying mechanism 6, and the film F is cut by the cutter mechanism 7 to form one sheet of rectangular film F. As shown in FIG. The film F is conveyed by both feeder units 61 and 62 to above the lifter mechanism 30, and both sides in the width direction are held under tension.

The object W is pushed up by the lifter mechanism 30 against the film F which is held in tension, and the film F is stretched so as to cover the object W. As shown in FIG. The periphery of the film F is folded under the tray T by the folding mechanism 37 . The object W is pushed out to the sealing mechanism 8 side by the discharge pusher 79a. After the film F is heat-sealed by the sealing mechanism 8 , it is discharged onto the discharge table 82 .

When executing a process including labeling, the label printer LP prints the price, weight, etc. of the product G calculated based on the weighing value on the label, and the label is applied to the film F by the label issuing machine LI. be.
[Control of packaging equipment]

The control device 9 includes a first calculator 93 , a second calculator 94 , a deviation calculator 95 , and a determination unit 96 in addition to a controller 91 and a storage unit 92 as functional configurations. The storage unit 92 includes a first storage unit 92a and a second storage unit 92b.

As described above, in the packaging device 1 , the rotating shaft 44 is rotationally driven in order to assist the drawing of the film F by the film conveying mechanism 6 . In order to make the amount of film F pulled out by the rotation of the rotating shaft 44 a target amount, the rotating shaft 44 must be rotated according to the current diameter (diameter, outer diameter) of the film roll R (hereinafter simply referred to as the current diameter). Need to adjust speed. That is, since the diameter of the film roll R decreases as the film F is used, it is necessary to perform feedback control to increase the rotation speed of the rotating shaft 44 in accordance with the decrease in the diameter of the film roll R.

The control unit 91 also controls the drive motor 43a so that the speed at which the film F is sent out from the film roll R by the rotation of the rotary shaft 44 is lower than the speed at which the film F is conveyed by the film conveying mechanism 6. . As a result, it is possible to apply an appropriate tension to the film F between the rotary shaft 44 and the film transport mechanism 6, and to suppress the occurrence of backlash caused by excessive rotation of the film roll R. can.

The first calculator 93 calculates (specifies) the initial value of the diameter of the film roll R based on the amount of rotation of the rotary shaft 44 detected by the detector 46 while the film F is being pulled out by the film transport mechanism 6. . The details of the calculation of this initial value will be described later. Further, the first calculator 93 calculates the current diameter of the film roll R based on the initial value of the diameter of the film roll R and the integrated amount of the film F pulled out from the film roll R by the film transport mechanism 6. . The current diameter of the film roll R calculated by the first calculator 93 is stored in the first storage 92a. For example, the first calculation unit 93 calculates the current diameter of the film roll R stored in the first storage unit 92a each time the object W is wrapped in film (the diameter of the film roll R at the time of the first film wrapping). By subtracting the used amount of the film F from the initial value), the current diameter of the film roll R is calculated (updated). The amount of film F used is determined based on the amount of film F fed by the film transport mechanism 6 (the first feeder unit 61 and the second feeder unit 62). The first calculator 93 may update the current diameter of the film roll R each time film wrapping is performed once, or update the current diameter of the film roll R each time film wrapping is performed a plurality of times. You may update.

The current diameter of the film roll R is calculated, for example, by the following formula.
Current diameter of film roll R = 2 (cross-sectional area of film roll R/π) ^1/2
Cross-sectional area of film roll R = Cross-sectional area of film F + Cross-sectional area of core Cross-sectional area of film F = Total length of film F x Thickness of film F

The controller 91 controls the drive motor 43 a so that the rotating shaft 44 rotates at a rotational speed corresponding to the current diameter of the film roll R calculated by the first calculator 93 . As a result, it is possible to realize feedback control according to the reduction in the diameter of the film roll R, and to bring the amount of the film F pulled out by the rotation of the rotating shaft 44 closer to the target amount.

The second calculator 94 calculates the current diameter of the film roll R based on the amount of rotation of the rotary shaft 44 detected by the detector 46 while the film F is being pulled out by the film transport mechanism 6 . For example, the current diameter of the film roll R is calculated by the following formula, where N is the amount of rotation of the rotating shaft 44 while the film F of the predetermined length L1 is being pulled out. The current diameter of the film roll R may be calculated based on the drawing speed of the film F by the film transport mechanism 6 and the rotation speed of the rotary shaft 44 .
Current diameter of film roll R = L1/πN

The second calculator 94 calculates the rotation axis 44 detected by the detector 46 while the film F is transported by the film transport mechanism 6 at a speed slower than during normal operation (a second speed in a speed reduction mode described later). The current diameter of the film roll R is calculated based on the amount of rotation of . The details of this processing will be described later.

The divergence calculator 95 calculates the divergence between the current diameter of the film roll R calculated by the first calculator 93 and the current diameter of the film roll R calculated by the second calculator 94 . When the difference calculated by the difference calculation unit 95 is smaller than a predetermined first value, the control unit 91 stores the current diameter of the film roll R calculated by the first calculation unit 93 as the current diameter of the film roll R. Stored in unit 92 . On the other hand, when the divergence calculated by the divergence calculator 95 is equal to or greater than the first value, the controller 91 sets the current diameter of the film roll R calculated by the second calculator 94 as the current diameter of the film roll R as the first value. 1 storage unit 92a. The first value is set to, for example, approximately 10 mm.

Therefore, when the divergence calculated by the divergence calculator 95 is greater than or equal to the first value, the current diameter of the film roll R stored in the first storage unit 92a is the same as the film roll calculated by the second calculator 94. Replaced (overwritten) with the current diameter of R. After that, the first calculator 93 continues to calculate the current diameter of the film roll R by subtracting the used amount of the film F from the current diameter of the replaced film roll R.

The control unit 91 controls the display panel 16 to notify the user of the abnormality when the difference calculated by the difference calculation unit 95 is equal to or greater than a predetermined second value. For example, the display panel 16 displays a screen prompting maintenance of the film transport mechanism 6 . The second value is set to, for example, approximately 20 mm. The second value may be the same as or different from the first value.

The calculation of the current diameter of the film roll R by the second calculator 94 and the calculation of the deviation by the deviation calculator 95 are performed each time the film F is used by a predetermined amount (for example, about 200 m to 300 m). Alternatively, these calculations may be performed each time film packaging is performed a predetermined number of times (for example, about 400 to 500 times). Since the speed of decrease in the diameter of the film roll R increases as the diameter of the film roll R decreases, the calculation timing may be advanced as the diameter of the film roll R decreases. For example, when the diameter of the film roll R is large, the calculation may be performed every time 300 m of the film F is used, while when the diameter of the film roll R is small, the calculation may be performed every time 250 m of the film F is used.

The second storage unit 92b uses the calculation result of the first calculation unit 93 to accumulate and store information about the diameter of the film roll R when the film roll R is replaced. When the film roll R is used and the film F on the film roll R is used up, the film roll R is replaced and a new film roll R is attached to the rotary shaft 44 . Each time the film roll R is replaced, the current diameter of the film roll R stored in the first storage unit 92a at that time is stored in the second storage unit as the diameter (final outer diameter) of the film roll R at the time of film replacement. 92b.

A plurality of determination methods are conceivable when the film roll R is replaced. For example, the point in time when the current diameter of the film roll R stored in the first storage unit 92a turns from decreasing to increasing (when it decreases the most) can be regarded as the time to replace the film roll R.

The judging section 96 judges whether or not the film conveying mechanism 6 is abnormal based on the information accumulated in the second storage section 92b. If there is no abnormality in the film transport mechanism 6, it is considered that the diameter of the film roll R is constant when the film roll R is replaced. Therefore, for example, when the diameter of the film roll R changes (increases or decreases) when the film roll R is replaced, it can be determined that the film transport mechanism 6 is malfunctioning. When the determination section 96 determines that the film transport mechanism 6 is abnormal, the control section 91 controls the display panel 16 to notify the user of the abnormality. For example, the display panel 16 displays a screen prompting maintenance of the film transport mechanism 6 .
[Driving mode]

The packaging machine 1 has a normal operation mode and a speed reduction mode as operation modes. In the normal operation mode, the film F is conveyed by the film conveying mechanism 6 at a first speed (normal speed), and the object W is wrapped in film. The first speed is set to, for example, approximately 1300 mm/sec. In the speed reduction mode, the film F is conveyed by the film conveying mechanism 6 at a second speed slower than the first speed, and the object W is film wrapped. The second speed is set to, for example, approximately 500 mm/sec. The first speed and the second speed are target values of speed and are final arrival speeds. The reason why the second speed is set to 500 m/sec in this example is that, as a result of experiments, it was found that the current diameter of the film roll R can be accurately grasped. However, the second speed is not limited to the speed as long as it is slower than the first speed. The rotation speed of the rotary shaft 44 is appropriately set according to the transport speed of the film F by the film transport mechanism 6 so that backlash does not occur.

In both the normal operation mode and the speed reduction mode, the controller 91 controls the speed at which the film F is fed from the film roll R by the rotation of the rotating shaft 44 to be the speed at which the film F is transported by the film transport mechanism 6 (first speed). , second speed).

The control unit 91 sets the operation mode to the speed reduction mode, for example, when the operation of the packaging apparatus 1 is started. Hereinafter, processing when the operation mode is set to the speed reduction mode at the start of operation will be described. The following processes are executed by the control unit 91 but may be executed by the first calculation unit 93 . In this case, the following processing can be regarded as processing for calculating (specifying) the initial value of the diameter of the film roll R by the first calculator 93 .

In the speed reduction mode, the process of detecting the amount of rotation of the rotating shaft 44 while the film F is being conveyed at the second speed is performed a plurality of times (for example, six times). When acquiring the rotation amount of the rotation shaft 44, the control unit 91 excludes the rotation amount of the rotation shaft 44 detected in the first processing, and obtains the rotation amount of the rotation shaft 44 detected in the second and subsequent processing. to get That is, the control unit 91 operates based only on the amount of rotation of the rotating shaft 44 detected in the second and subsequent processes.

As shown in FIG. 10, the control unit 91 calculates the average value of the amount of rotation of the rotating shaft 44 detected in the second and third processes (step S1). Subsequently, based on the calculated average value and the diameter of the film roll R when the operation was stopped last time stored in the storage unit 92, the control unit 91 determines whether the film roll R attached to the rotating shaft 44 was last It is determined whether or not it is the film roll R at the time of operation stop (step S2). When the control unit 91 determines that the film roll R attached to the rotating shaft 44 is the film roll R at the time when the operation was stopped last time (YES in step S2), the process ends. When the control unit 91 determines that the film roll R attached to the rotary shaft 44 is not the film roll R at the time when the operation was stopped last time (NO in step S2), the process proceeds to step S3.

In step S2, for example, if the difference between the current diameter of the film roll R calculated based on the average value of the amount of rotation and the diameter of the film roll R at the time when operation was stopped last time is equal to or less than a predetermined value, the controller 91 , the film roll R attached to the rotating shaft 44 is determined to be the film roll R at the time when the operation was stopped last time. On the other hand, when the difference between the current diameter of the film roll R calculated based on the average value and the diameter of the film roll R at the time when the operation was stopped last time is larger than the predetermined value, the controller 91 rotates the rotating shaft 44. It is determined that the attached film roll R is not the film roll R at the time when the operation was stopped last time. The predetermined value is, for example, approximately 10 mm to 20 mm. However, the amount of rotation of the rotating shaft 44 varies depending on the diameter of the film roll R and the length of the film F (the length cut by the cutter mechanism 7), and can take various values in consideration of the measurement accuracy. Depending on the diameter of the film roll R and the length of the film F, the predetermined value can be set to an appropriate value of about 1 mm to 20 cm.

Alternatively, in step S2, the control unit 91 may compare the corresponding value corresponding to the diameter of the film roll R at the time when the operation was stopped last time and the amount of rotation of the rotating shaft 44 . The corresponding value is, for example, a value obtained by converting the diameter of the film roll R when the operation was stopped last time into a rotation amount corresponding to the diameter. The conversion can be performed, for example, by referring to a conversion table in which the amount of rotation of the rotating shaft 44 and the diameter of the film roll R are associated with each other. When the difference between the average value of the amount of rotation and the corresponding value is equal to or less than a predetermined value, the control unit 91 determines that the film roll R attached to the rotating shaft 44 is the film roll R at the time when the operation was stopped last time. . On the other hand, when the difference between the average value and the corresponding value is larger than the predetermined value, the control unit 91 determines that the film roll R attached to the rotary shaft 44 is not the film roll R at the time when the operation was stopped last time. . Although the predetermined value is, for example, about 10 mm to 20 mm, it can be set to an appropriate value of about 1 mm to 20 cm like the predetermined value.

In step S3, based on the calculated average value and the diameter of the film roll R before use stored in the storage unit 92, the control unit 91 determines whether the film roll R attached to the rotation shaft 44 is before use. is the film roll R. When the control unit 91 determines that the film roll R attached to the rotating shaft 44 is the film roll R before use (YES in step S3), the process ends. When the control unit 91 determines that the film roll R attached to the rotating shaft 44 is not the film roll R before use (NO in step S3), the next process (fourth process) is performed.

In step S3, for example, if the difference between the current diameter of the film roll R calculated based on the average value of the amount of rotation and the diameter of the film roll R before use is equal to or less than a predetermined value, the controller 91 rotates It is determined that the film roll R attached to the shaft 44 is the film roll R before use. On the other hand, when the difference between the current diameter of the film roll R calculated based on the average value and the diameter of the film roll R before use is larger than a predetermined value, the control unit 91 is attached to the rotating shaft 44. It is determined that the film roll R is not the film roll R before use. Although the predetermined value is, for example, about 10 mm to 20 mm, it can be set to an appropriate value of about 1 mm to 20 cm like the predetermined value.

Alternatively, in step S<b>3 , the controller 91 may compare the corresponding value corresponding to the diameter of the film roll R before use with the amount of rotation of the rotating shaft 44 . The corresponding value is, for example, a value obtained by converting the diameter of the film roll R before use into an amount of rotation corresponding to the diameter. The conversion can be performed, for example, by referring to a conversion table. The control unit 91 determines that the film roll R attached to the rotating shaft 44 is the film roll R before use when the difference between the average value of the rotation amount and the corresponding value is equal to or less than a predetermined value. On the other hand, when the difference between the average value and the corresponding value is greater than the predetermined value, the control section 91 determines that the film roll R attached to the rotating shaft 44 is not the film roll R before use. Although the predetermined value is, for example, about 10 mm to 20 mm, it can be set to an appropriate value of about 1 mm to 20 cm like the predetermined value.

Subsequently, the control unit 91 executes the fourth process, and calculates the average value of the amount of rotation of the rotating shaft 44 detected in the second to fourth processes. Based on the calculated average value and the diameter of the film roll R when operation was stopped last time stored in the storage unit 92, the control unit 91 determines the diameter of the film roll R attached to the rotation shaft 44 when operation was stopped last time. is the film roll R. Based on the calculated average value and the diameter of the film roll R before use stored in the storage unit 92, the control unit 91 determines whether the film roll R attached to the rotating shaft 44 is a film before use. It is determined whether or not it is the role R. The details of these processes are the same as those of steps S2 and S3, so the description is omitted.

Subsequently, the control unit 91 calculates the average value of the amount of rotation of the rotary shaft 44 detected in the second to fifth processes. Based on the calculated average value and the diameter of the film roll R when operation was stopped last time stored in the storage unit 92, the control unit 91 determines the diameter of the film roll R attached to the rotation shaft 44 when operation was stopped last time. is the film roll R. Based on the calculated average value and the diameter of the film roll R before use stored in the storage unit 92, the control unit 91 determines whether the film roll R attached to the rotating shaft 44 is a film before use. It is determined whether or not it is the role R. The details of these processes are the same as those of steps S2 and S3, so the description is omitted.

Subsequently, the control unit 91 calculates the average value of the amount of rotation of the rotary shaft 44 detected in the second to sixth processes. Based on the calculated average value and the diameter of the film roll R when operation was stopped last time stored in the storage unit 92, the control unit 91 determines the diameter of the film roll R attached to the rotation shaft 44 when operation was stopped last time. is the film roll R. Based on the calculated average value and the diameter of the film roll R before use stored in the storage unit 92, the control unit 91 determines whether the film roll R attached to the rotating shaft 44 is a film before use. It is determined whether or not it is the role R. The details of these processes are the same as the processes of steps S2 and S3, so the description is omitted. Note that the control unit 91 may calculate the average value of the amount of rotation of the rotating shaft 44 in a plurality of processes. An average value of the rotation amount of 44 may be calculated and used for determination.

In the above processing, when the control unit 91 determines that the film roll R attached to the rotating shaft 44 is the film roll R at the time when the operation was stopped last time, the diameter of the film roll R at the time when the operation was stopped last time is The initial value of the diameter of the roll R is stored in the storage unit 92 (first storage unit 92a). This initial value is used to calculate the current diameter of the film roll R by the first calculator 93 described above.

When the control unit 91 determines in the above process that the film roll R attached to the rotating shaft 44 is the film roll R before use, the diameter of the film roll R before use is changed to the diameter of the film roll R. is stored in the storage unit 92 (first storage unit 92a) as an initial value of . This initial value is used to calculate the current diameter of the film roll R by the first calculator 93 described above.

In the above processing, if the control unit 91 determines that the film roll R attached to the rotating shaft 44 is neither the film roll R at the time of the previous operation stop nor the film roll R before use, the second to sixth times The current diameter of the film roll R is calculated based on the average value of the amount of rotation of the rotation shaft 44 detected in the process 1, and is stored in the storage unit 92 (first storage unit 92a) as the initial value of the film roll R. Calculation of the current diameter of the film roll R based on the average value of the amount of rotation can be performed in the same manner as the calculation of the current diameter of the film roll R by the second calculator 94 described above. The calculated initial value is used in the process of calculating the current diameter of the film roll R by the first calculator 93 described above. Note that the control unit 91 may calculate the current diameter of the film roll R based on the average value of the amount of rotation of the rotating shaft 44 in the two most recent processes.

At the start of operation, the initial value of the diameter of the film roll R is set by the above processing, and the first calculator 93 calculates the current diameter of the film roll R using the initial value as described above. After completing the above process, the control unit 91 switches the operation mode from the speed reduction mode to the normal operation mode. In the normal operation mode, as described above, the control unit 91 controls the drive motor 43a so that the rotation shaft 44 rotates at a rotation speed corresponding to the current diameter of the film roll R calculated by the first calculation unit 93. . That is, in the normal operation mode, the control unit 91 causes the rotation shaft 44 to rotate at a rotation speed corresponding to the current diameter of the film roll R, which is grasped using the amount of rotation of the rotation shaft 44 detected in the speed reduction mode. Then, the drive motor 43a is controlled.

In the above-described process, the controller 91 controls the delivery speed at which the film F is delivered from the film roll R by the rotation of the rotating shaft 44 in the N-th process (N is an integer equal to or greater than 3) to the rotation in the N-1th process. Adjustment is made based on the detection result of the amount of rotation of the shaft 44 . In the first and second processes, the current diameter of the film roll R is not estimated. Therefore, the controller 91 sets the feeding speed to a relatively slow speed corresponding to the maximum diameter of the film roll R (the diameter of the new film roll R). Note that the control unit 91 may operate using the rotation amount of the rotation shaft 44 detected in the first process without excluding the rotation amount of the rotation shaft 44 detected in the first process. In this case, the control unit 91 determines the feeding speed at which the film F is fed from the film roll R by the rotation of the rotation shaft 44 in the second processing based on the detection result of the rotation amount of the rotation shaft 44 in the first processing. can be adjusted.

In the third process, the controller 91 sets the feeding speed to a speed corresponding to the amount of rotation of the rotary shaft 44 detected in the second process (in other words, the current diameter of the film roll R). More specifically, the controller 91 controls the drive motor 43a so that the feeding speed becomes the speed. In the fourth process, the controller 91 sets the delivery speed to a speed corresponding to the amount of rotation of the rotating shaft 44 detected in the third process. Similarly, in the fifth and sixth processes, the controller 91 sets the delivery speed to a speed corresponding to the amount of rotation of the rotating shaft 44 detected in the fourth and fifth processes. In the above processing, the transmission speed in the Nth processing is faster than the transmission speed in the (N-1)th processing. This is because the initial value of the delivery speed is set to a relatively slow speed corresponding to the maximum diameter of the film roll R. Note that the adjustment of the sending speed does not necessarily have to be performed in each processing, and may be performed only in the third processing, for example.

In the above-described process, the control unit 91 sets the transport speed (second speed) at which the film F is transported by the film transport mechanism 6 in the Nth process to a speed higher than the transport speed in the N-1th process. set (adjust) to In the first and second processes, the current diameter of the film roll R is not estimated. Therefore, there is a possibility that the rotation of the rotary shaft 44 by the drive motor 43a is not sufficiently assisted. There is a possibility that the film F may be stretched excessively due to a speed difference between the film F and the transport speed of the film F. On the other hand, in the third and subsequent processes in which the current diameter of the film roll R can be estimated based on the amount of rotation of the rotating shaft 44, the rotation of the rotating shaft 44 is appropriately assisted by the drive motor 43a. Even if the transport speed of the film transport mechanism 6 is increased, the speed difference is less likely to occur. Note that the adjustment of the conveying speed does not necessarily have to be performed in each processing, and may be performed only in the third processing, for example.

The control unit 91 also sets the operation mode to the speed reduction mode when the second calculation unit 94 calculates the current diameter of the film roll R (in other words, the operation mode is changed from the normal operation mode to the speed reduction mode). ). As a result, the amount of rotation of the rotating shaft 44 is detected by the detector 46 while the film F is transported by the film transport mechanism 6 at the second speed slower than the first speed in the normal operation mode. The second calculator 94 calculates the current diameter of the film roll R based on the amount of rotation detected in the speed reduction mode.
[Action and effect]

In the packaging apparatus 1, in the speed reduction mode, the amount of rotation of the rotating shaft 44 is detected while the film F is conveyed at a second speed slower than the first speed at which the film F is conveyed in the normal operation mode. be. As a result, the amount of rotation of the rotating shaft 44 can be detected while the elongation of the film F is suppressed, and as a result, the current diameter of the film roll R can be accurately grasped.

In the normal operation mode, the control unit 91 rotates the rotation shaft 44 at a rotation speed corresponding to the current diameter of the film roll R, which is grasped using the amount of rotation of the rotation shaft 44 detected in the speed reduction mode. It controls the drive motor 43a. As a result, the rotation shaft 44 can be rotated at a rotation speed corresponding to the current diameter of the film roll R.

In the normal operation mode, the control unit 91 drives so that the speed at which the film F is sent out from the film roll R by the rotation of the rotary shaft 44 is lower than the first speed at which the film F is transferred by the film transfer mechanism 6. It controls the motor 43a. Accordingly, it is possible to apply appropriate tension to the film F between the rotating shaft 44 and the film transport mechanism 6 . In addition, the occurrence of backlash due to excessive rotation of the film roll R can be suppressed.

On the other hand, if there is a speed difference between the feeding speed due to the rotation of the rotating shaft 44 and the transporting speed of the film transporting mechanism 6, the film F tends to stretch between the rotating shaft 44 and the film transporting mechanism 6. FIG. In this regard, since the packaging apparatus 1 detects the amount of rotation of the rotating shaft 44 in the speed reduction mode, the amount of rotation of the rotating shaft 44 can be detected in a state in which the speed difference is reduced and the elongation of the film F is suppressed. can be done. As a result, it is possible to grasp the current diameter of the film roll R with high accuracy.

The control unit 91 adjusts the delivery speed at which the film F is delivered from the film roll R by the rotation of the rotation shaft 44 in the N-th process, based on the detection result of the rotation amount of the rotation shaft 44 in the N-1th process. do. This makes it possible to grasp the current diameter of the film roll R with higher accuracy. That is, by using the detection result of the amount of rotation of the rotating shaft 44 in the (N-1)th process, the current diameter of the film roll R can be estimated to some extent, and the feeding speed is adjusted to the speed corresponding to the current diameter. can be set. In the above example, the feeding speed in the N-th processing is faster than the feeding speed in the (N-1)-th processing. The speed difference becomes smaller. As a result, in the next process, the amount of rotation of the rotary shaft 44 can be detected while the elongation of the film F is further suppressed, and the current diameter of the film roll R can be grasped more accurately.

In the speed reduction mode, the process of detecting the amount of rotation of the rotating shaft 44 is performed a plurality of times while the film F is being conveyed at the second speed, and the controller 91 detects the rotation of the rotating shaft 44 in the plurality of processes. Calculate the average amount. This makes it possible to grasp the current diameter of the film roll R with higher accuracy.

The controller 91 sets the speed at which the film F is transported by the film transport mechanism 6 in the N-th process to a speed higher than the speed at which the film F is transported by the film transport mechanism 6 in the N-1th process. . As a result, the time required to detect the amount of rotation of the rotating shaft 44 can be shortened. As described above, when the feed speed in the N-th process is faster than the feed speed in the (N-1)-th process, the feed speed due to the rotation of the rotating shaft 44 and the transport speed by the film transport mechanism 6 change each time the process progresses. improve the balance between Therefore, even if the conveying speed (second speed) increases, the rotation amount of the rotating shaft 44 can be detected with high accuracy.

When the control unit 91 acquires the rotation amount of the rotation shaft 44, the rotation amount of the rotation shaft 44 detected in the first process is excluded, and the rotation amount of the rotation shaft 44 detected in the second and subsequent processes is obtained. to get This makes it possible to grasp the current diameter of the film roll R with much higher accuracy. This is because the film F between the rotating shaft 44 and the film transport mechanism 6 may be slack at the time of the first processing, and the detection result in the first processing may contain an error. It's for.

Based on the amount of rotation of the rotating shaft 44 detected in the speed reduction mode and the diameter of the film roll R at the time of the last operation stop, the control unit 91 determines whether the film roll R attached to the rotating shaft 44 was stopped last time. It is determined whether it is the film roll R at the time. This makes it possible to accurately determine whether or not the film roll R attached to the rotary shaft 44 is the film roll R at the time when the operation was stopped last time.

Based on the amount of rotation of the rotating shaft 44 detected in the speed reduction mode and the diameter of the film roll R before use, the control unit 91 determines whether the film roll R attached to the rotating shaft 44 is the film before use. It is determined whether or not it is the role R. Thereby, it is possible to accurately determine whether the film roll R attached to the rotating shaft 44 is the film roll R before use.
[Modification]

The present invention is not limited to the above embodiments. For example, the controller 91 may calculate the current diameter of the film roll R based on the amount of rotation of the rotating shaft 44 detected in the speed reduction mode. In this case, the current diameter of the film roll R can be calculated with high accuracy. The calculated current diameter of the film roll is used, for example, to notify the user of the replacement timing of the film roll R. FIG.

In the above-described embodiment, the control unit 91 sets the operation mode to the speed reduction mode at the start of operation. 400 to 500 times), when the film F has been used for a predetermined amount (for example, about 200 m to 300 m), and at least one time when the film roll R is replaced, the operation mode is changed to the speed reduction mode. May be set. In this case, the current diameter of the film roll R can be accurately grasped at these times. When the operation mode is set to the speed reduction mode when a predetermined amount of the film F is used, the speed of decrease in the diameter of the film roll R increases as the diameter of the film roll R decreases. The setting timing may be advanced according to the decrease. For example, when the diameter of the film roll R is large, the operation mode is set to the speed reduction mode every time 300 m of the film F is used. may be set to slow down mode.

Although the film F1 or the film F2 is pulled out from the pair of film rolls R1 and R2 in the above embodiment, only one film roll R may be provided and the film F may be pulled out from the film roll R. Similar control can be applied to configurations in which a pair of film rolls R are provided and configurations in which only one film roll R is provided. The rotating shaft 44 does not have to be driven to rotate. In this case, the rotary shaft 44 may rotate following the transport of the film F by the film transport mechanism 6 . In the speed reduction mode of the above embodiment, the process of detecting the amount of rotation of the rotating shaft 44 is performed multiple times, but the process may be performed only once. Two processes may be performed when the control unit 91 excludes the rotation amount of the rotating shaft 44 detected in the first process. The process may be performed only once when the controller 91 does not exclude the rotation amount of the rotating shaft 44 detected in the first process.

The first calculator 93 calculates a first correspondence corresponding to the initial value of the diameter of the film roll R based on the amount of rotation of the rotary shaft 44 detected by the detector 46 while the film F is being pulled out by the film transport mechanism 6. value may be calculated. The first calculator 93 calculates a second corresponding value corresponding to the current diameter of the film roll R based on the first corresponding value and the integrated amount of the film F pulled out from the film roll R by the film transport mechanism 6. can be calculated. In this case, the control unit 91 controls the drive motor 43a so that the rotation shaft 44 rotates at a rotation speed corresponding to the current diameter of the film roll R corresponding to the second corresponding value calculated by the first calculation unit 93. You may The divergence calculator 95 calculates the divergence between the current diameter of the film roll R corresponding to the second corresponding value calculated by the first calculator 93 and the current diameter of the film roll R calculated by the second calculator 94. may be calculated. The first storage unit 92a stores the current diameter of the film roll R corresponding to the second corresponding value calculated by the first calculation unit 93 when the deviation calculated by the deviation calculation unit 95 is smaller than the first value. The current diameter of the roll R may be stored in the storage unit 92 . The first corresponding value and the second corresponding value are, for example, the amount of rotation of the rotating shaft 44 corresponding to the diameter of the film roll R. Conversion between the diameter of the film roll R and the amount of rotation of the rotating shaft 44 can be performed, for example, by referring to a conversion table in which the diameter of the film roll R and the amount of rotation of the rotating shaft 44 are associated. Thus, the control of each part, the calculation of each value, and the like may be executed without converting the detected amount of rotation of the rotating shaft 44 into the diameter of the film roll R. The first corresponding value and the second corresponding value may be the diameter of the film roll R itself, or may be a value corresponding to the diameter of the film roll R. Processing by at least one of the first calculator 93 , the second calculator 94 , the deviation calculator 95 , and the determiner 96 may be performed by the controller 91 . Alternatively, the processing by the control unit 91 may be executed by at least one of the first calculation unit 93 , the second calculation unit 94 , the deviation calculation unit 95 and the determination unit 96 .

DESCRIPTION OF SYMBOLS 1... Packaging apparatus 6... Film conveyance mechanism (conveyance part) 7... Cutter mechanism (cutting part) 10... Packaging mechanism (packaging part) 43a... Drive motor (driving part) 44, 44a, 44b... Rotating shaft , 46... Detector (detection unit), 91... Control unit, 92... Storage unit, F, F1, F2... Film, R, R1, R2... Film roll, W... Object.

Claims (10)

a rotating shaft on which a film roll wound with film is attached;
a detection unit that detects the amount of rotation of the rotating shaft;
a conveying unit that pulls out and conveys the film from the film roll attached to the rotating shaft;
a cutting section that cuts the film conveyed by the conveying section;
a packaging unit that packages an object with the cut film;
A control unit that executes control according to the operation mode,
The operating mode is
a normal operation mode in which the film is transported at a first speed by the transport unit;
a speed reduction mode in which the detecting unit detects the amount of rotation of the rotating shaft while the film is being conveyed by the conveying unit at a second speed lower than the first speed ,
The packaging device, wherein the controller calculates the current diameter of the film roll based on the amount of rotation of the rotating shaft detected in the speed reduction mode. further comprising a driving unit that rotates the rotating shaft;
In the normal operation mode, the control unit causes the rotation shaft to rotate at a rotation speed corresponding to the current diameter of the film roll ascertained using the rotation amount of the rotation shaft detected in the speed reduction mode. 2. The packaging machine according to claim 1 , wherein said drive is controlled so as to. In the normal operation mode, the control unit causes the speed at which the film is sent out from the film roll due to the rotation of the rotating shaft to be slower than the first speed at which the film is conveyed by the conveying unit, 3. A packaging machine as claimed in claim 2 , which controls the drive. a rotating shaft on which a film roll wound with film is attached;
a detection unit that detects the amount of rotation of the rotating shaft;
a conveying unit that pulls out and conveys the film from the film roll attached to the rotating shaft;
a cutting section that cuts the film conveyed by the conveying section;
a packaging unit that packages an object with the cut film;
A control unit that performs control according to the operation mode;
and a drive unit that rotates the rotating shaft,
The operating mode is
a normal operation mode in which the film is transported at a first speed by the transport unit;
a speed reduction mode in which the detecting unit detects the amount of rotation of the rotating shaft while the film is being conveyed by the conveying unit at a second speed lower than the first speed,
In the normal operation mode, the control unit causes the rotation shaft to rotate at a rotation speed corresponding to the current diameter of the film roll ascertained using the rotation amount of the rotation shaft detected in the speed reduction mode. so as to control the drive unit,
In the speed reduction mode, a process of detecting the amount of rotation of the rotation shaft is performed a plurality of times while the film is being conveyed at the second speed,
The control unit adjusts the speed at which the film is sent out from the film roll by the rotation of the rotating shaft in the N-th (N is an integer of 2 or more) of the processing, and the rotation of the rotating shaft in the N-1-th processing. A packaging device that adjusts based on the detection result of the quantity. a rotating shaft on which a film roll wound with film is attached;
a detection unit that detects the amount of rotation of the rotating shaft;
a conveying unit that pulls out and conveys the film from the film roll attached to the rotating shaft;
a cutting section that cuts the film conveyed by the conveying section;
a packaging unit for packaging an object with the cut film;
A control unit that executes control according to the operation mode,
The operating mode is
a normal operation mode in which the film is transported at a first speed by the transport unit;
a speed reduction mode in which the detecting unit detects the amount of rotation of the rotating shaft while the film is being conveyed by the conveying unit at a second speed lower than the first speed,
In the speed reduction mode, a process of detecting the rotation amount of the rotation shaft is performed a plurality of times while the film is being conveyed at the second speed,
The packaging device, wherein the control unit calculates an average value of the amount of rotation of the rotating shaft in a plurality of times of the processing. The control unit sets the speed at which the film is transported by the transport unit in the Nth process to a speed higher than the speed at which the film is transported by the transport unit in the N-1th process. , 6. Packaging apparatus according to claim 4 or 5 . When acquiring the rotation amount of the rotation shaft, the control unit excludes the rotation amount of the rotation shaft detected in the first processing, and determines the rotation amount of the rotation shaft detected in the second and subsequent processing. The packaging device according to any one of claims 4 to 6 , which acquires the amount of rotation. a rotating shaft on which a film roll wound with film is attached;
a detection unit that detects the amount of rotation of the rotating shaft;
a conveying unit that pulls out and conveys the film from the film roll attached to the rotating shaft;
a cutting section that cuts the film conveyed by the conveying section;
a packaging unit that packages an object with the cut film;
A control unit that performs control according to the operation mode;
A storage unit that stores the diameter of the film roll at the time of last operation stop,
The operating mode is
a normal operation mode in which the film is transported at a first speed by the transport unit;
a speed reduction mode in which the detecting unit detects the amount of rotation of the rotating shaft while the film is being conveyed by the conveying unit at a second speed lower than the first speed,
Based on the rotation amount of the rotating shaft detected in the speed reduction mode and the diameter of the film roll at the time when the operation was stopped last time, the control unit determines whether the film roll attached to the rotating shaft was operated last time. A packaging device that determines whether it is the film roll at the time of stop. a rotating shaft on which a film roll wound with film is attached;
a detection unit that detects the amount of rotation of the rotating shaft;
a conveying unit that pulls out and conveys the film from the film roll attached to the rotating shaft;
a cutting section that cuts the film conveyed by the conveying section;
a packaging unit that packages an object with the cut film;
A control unit that performs control according to the operation mode;
A storage unit that stores the diameter of the film roll before use,
The operating mode is
a normal operation mode in which the film is transported at a first speed by the transport unit;
a speed reduction mode in which the detecting unit detects the amount of rotation of the rotating shaft while the film is being conveyed by the conveying unit at a second speed lower than the first speed,
Based on the amount of rotation of the rotating shaft detected in the speed reduction mode and the diameter of the film roll before use, the control unit determines whether the film roll attached to the rotating shaft is the pre-use film roll. A packaging device that determines whether it is a film roll. a rotating shaft on which a film roll wound with film is attached;
a detection unit that detects the amount of rotation of the rotating shaft;
a conveying unit that pulls out and conveys the film from the film roll attached to the rotating shaft;
a cutting section that cuts the film conveyed by the conveying section;
a packaging unit that packages an object with the cut film;
A control unit that executes control according to the operation mode,
The operating mode is
a normal operation mode in which the film is transported at a first speed by the transport unit;
a speed reduction mode in which the detecting unit detects the amount of rotation of the rotating shaft while the film is being conveyed by the conveying unit at a second speed lower than the first speed,
At least one of when the operation is started, when the packaging unit has wrapped the object a predetermined number of times, when a predetermined amount of the film has been used, and when the film roll is replaced, The packaging device, wherein the operation mode is set to the slowdown mode.

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