WO2016152538A1 - Packaging apparatus - Google Patents

Abstract

The CPU of a packaging apparatus moves a stand downstream (S15, S27). The CPU bonds a film to the stand (S21). The CPU moves guiding rollers downward from above (S29). The CPU moves the film in the winding direction (S43) by outputting a first pulse signal to a DC motor. When the film is moved in the winding direction and the motor rotation speed is less than a second threshold (S45: YES), the CPU determines a second pulse signal (S49). The CPU moves the film in the winding direction (S51) by outputting the second pulse signal to the DC motor. The CPU moves the stand from the downstream side to the upstream side. The CPU bonds the film to the stand.

Description

Packaging equipment

The present invention relates to a packaging device that covers at least a part of an article with a film.

There has been proposed a packaging device that covers and wraps a part of an article with a film while the article is placed on a plate-like pedestal. For example, in the packaging apparatus described in Patent Document 1, a film is disposed at a position that intersects a conveyance path through which a pedestal passes during conveyance. The pedestal and the article are conveyed toward the film from the upstream side (hereinafter referred to as “first step”). The film is pulled downstream by contacting the pedestal and the downstream side of the article. Next, the guide roller for guiding the film guides the film to the upstream side of the base and the article (hereinafter referred to as “second step”). Next, the base and the article are conveyed toward the upstream side (hereinafter referred to as “third step”). The film is pulled upstream in contact with the pedestal and the upstream side of the article. The film is pressed against the pedestal and the article with a strength corresponding to the tension when pulled. In the first to third steps, the film is unwound from the film roll as the pedestal and article are conveyed and the film is moved by the guide roller.

Next, the part of the film covering the pedestal and the article is cut off from the film roll by the cutting part. The end of the cut film is sandwiched between the heater and the pedestal. The heater is heated to weld the end of the film to the pedestal. By the above, an article is packaged with a film.

JP 2014-97835 A

Depending on the amount of the film fed from the film roll in the third step, the tension applied to the film in the first step and the second step may be weakened in the third step. In this case, there is a problem that the film does not adhere to the article in a state where the end portion of the film is welded to the pedestal after the third step, and the article cannot be appropriately wrapped with the film.

An object of the present invention is to provide a packaging device that suppresses a decrease in film tension in a process in which a pedestal and an article are conveyed toward an upstream side.

The packaging apparatus according to the present invention is a packaging apparatus that wraps a pedestal and an article placed on the pedestal with a film, a transport mechanism that moves the pedestal on which the article is placed, and the transport It is movable along a movement path extending in the vertical direction with respect to the conveyance path through which the pedestal that moves by a mechanism passes, and is provided on the upper side with respect to the conveyance path, and a guide section for guiding the film, The upstream end of the pedestal arranged on the upstream side with respect to the mounting position where the film roll on which the film is wound can be mounted and the transport path and the movement path intersect each other A first moving means for relatively moving the pedestal by the transport mechanism until a portion is arranged downstream of the crossing position, and a first bonding hand for bonding a part of the film to the pedestal And the first moving means relatively moves the pedestal, and then moves the guide portion along the moving path from an upper position to a lower position with respect to the transport path in the moving path. In the moving direction of the film when the film is unwound from the film roll when the pedestal is relatively moved by the second moving means and the first moving means, and when the guiding portion is moved by the second moving means. A DC motor for moving the film in any one of a feeding direction and a winding direction that is a moving direction of the film when the film is wound on the film roll, and the second moving unit. After the guide part is moved, the film is moved in the winding direction by outputting a current of the first electric quantity to the DC motor. A third moving means for moving the film, a first judging means for judging whether or not a moving speed of the film when the film is moved in the winding direction by the third moving means satisfies a first predetermined condition; A current of the second electric quantity determined by the first determining means when the moving speed is determined to satisfy the first predetermined condition by a first determining means for determining an electric quantity and the first determining means; When the movement speed is determined to satisfy the first predetermined condition by the fourth movement means for moving the film in the winding direction by outputting to the DC motor, and the first determination means, The fifth moving means for moving the pedestal relative to each other by the transport mechanism until the upstream end of the pedestal is arranged on the upstream side of the guide portion, and the fifth moving means. And second adhesive means for adhering the other part of the film to the pedestal after the pedestal is relatively moved.

The packaging device moves the film in the winding direction after moving the guide part to a lower position in the movement path. The packaging device determines the timing for starting the relative movement of the base to the upstream side based on the moving speed of the film when the film is moved in the winding direction, and starts the relative movement. When the pedestal is relatively moved upstream, the movement of the film in the winding direction is continued. For this reason, a packaging apparatus can suppress that a film loosens and tension | tensile_strength falls, when a base is moved relatively upstream. Therefore, the packaging apparatus can wrap an article by bringing the article into close contact with the film.

In the present invention, the first determination unit may determine the second electric quantity when the first determination unit determines that the moving speed satisfies the first predetermined condition. In this case, the packaging device can determine the second electric quantity immediately before the timing of outputting the current of the second electric quantity to the DC motor.

In the present invention, the first electric quantity and the second electric quantity may be different. In this case, after starting the relative movement to the upstream side of the pedestal and the driving condition of the DC motor when the packaging device moves the film in the winding direction before starting the relative movement to the upstream side of the pedestal. The driving conditions of the DC motor when moving the film in the winding direction can be made different.

In the present invention, a first acquisition unit that acquires a diameter of the film roll is provided, and the first determination unit determines the second electric quantity based on the diameter acquired by the first acquisition unit. Good. In this case, the packaging device can switch the driving condition of the DC motor according to the diameter of the film roll.

In the present invention, there may be provided second acquisition means for acquiring the width of the film, and the first determination means may determine the second electric quantity based on the width acquired by the second acquisition means. . In this case, the packaging device can switch the driving condition of the DC motor according to the width of the film.

In the present invention, a third acquisition unit that acquires a set tension of the film is provided, and the first determination unit determines the second electric quantity based on the set tension acquired by the third acquisition unit. Also good. In this case, the packaging device can switch the driving condition of the DC motor according to the set tension of the film.

In the present invention, the first determination means may determine that the first predetermined condition is satisfied when the moving speed is smaller than a predetermined threshold. In this case, the packaging apparatus can start relative movement to the upstream side of the pedestal in a state where a predetermined tension or more is applied to the film.

In the present invention, after the guide unit is moved by the second moving unit, an initial moving unit that moves the film in the winding direction by outputting an initial electric current to the DC motor, and Second determination means for determining whether an acceleration of the film when the film is moved in the winding direction by an initial movement means satisfies a second predetermined condition, and the third movement means includes the second movement means, 2 When the acceleration is determined to satisfy the second predetermined condition by the determination means, the film may be moved in the winding direction by outputting the current of the first electric quantity to the DC motor. . In this case, the packaging apparatus can switch the driving condition of the DC motor after moving the guide part to the lowest side of the movement path and before starting the relative movement to the upstream side of the pedestal.

In the present invention, the fifth moving unit starts the relative movement of the pedestal by the transport mechanism after the movement of the film in the winding direction by the fourth moving unit is started. The means may end the movement of the film in the winding direction after the relative movement of the pedestal by the fifth moving means is completed. In this case, the packaging device can appropriately suppress the decrease in the film tension when the pedestal is relatively moved upstream, by moving the film in the winding direction during the relative movement of the pedestal. .

In the present invention, the diameter of the film roll, the width of the film, and the fourth acquisition means for acquiring at least one of the set tension of the film, the diameter acquired by the fourth acquisition means, the width, And second determining means for determining the first electric quantity based on at least one of the set tensions, and the third moving means is the first electric quantity determined by the second determining means. The current may be output to the DC motor to move the film in the winding direction. In this case, the packaging device can switch the driving condition of the DC motor according to the diameter and width of the film and the set tension of the film.

It is a perspective view of packaging device 1 (state where case 800 was equipped). It is a perspective view of packaging device 1 (state which removed case 800). FIG. 4 is a perspective view of a transport mechanism 50 and cradles 12 and 13. 3 is a perspective view of a transport mechanism 50. FIG. 4 is a perspective view of a guide mechanism 39. FIG. 4 is a perspective view of a heating mechanism 86 and a rotation suppression mechanism 80. FIG. 2 is a block diagram showing an electrical configuration of the packaging device 1. FIG. It is a flowchart of a packaging process. It is a flowchart of a packaging process, Comprising: It is a continuation of FIG. 8A. It is a flowchart of a packaging process, Comprising: It is a continuation of FIG. 8B. 3 is a grab showing the relationship between the rotational speed and rotational acceleration of a motor 227. It is a figure which shows a packaging process. It is a figure which shows a packaging process. It is a figure which shows a packaging process. It is a figure which shows a packaging process. It is a figure which shows a packaging process. It is a figure which shows a packaging process. It is a figure which shows a packaging process.

Embodiments of the present invention will be described with reference to the drawings. The packaging device 1 wraps the article 3 by covering the article 3 placed on the base 2 such as a mount with a film 24 and fixing the article 3 to the base 2. Hereinafter, packaging the article 3 in this manner is referred to as “packing the base 2 and the article 3”. The packaging device 1 conveys the pedestal 2 on which the article 3 is placed from the lower right side of FIG. 1 toward the upper left side, and wraps the pedestal 2 and the article 3. The upper side, the lower side, the left diagonally lower side, and the right diagonal upper side in FIG. The diagonally lower right side and the diagonally upper left side in FIG. 1 are referred to as upstream and downstream in the transport direction, respectively.

<Case 800>
As shown in FIG. 1, the packaging device 1 includes a housing 800. The shape of the housing 800 is a substantially rectangular parallelepiped whose longitudinal direction is the vertical direction. The housing 800 includes an upper housing 801 and a lower housing 803. The upper housing 801 includes two standing portions 802A and a erection portion 802B. The two standing portions 802A extend upward from both left and right end portions of the lower housing 803, respectively. The erection part 802B is erected between the upper ends of the two erection parts 802A. A display unit 207 capable of displaying various types of information is provided on the right standing unit 802A.

The two standing portions 802A cover side plate members 111 and 112 (see FIG. 2) described later from the right side and the left side, respectively. The erection part 802B covers a film roll 22 (see FIG. 2) described later from above. A portion surrounded by the lower housing 803, the two standing portions 802A, and the erection portion 802B forms an internal space of the housing 800. The internal space of the housing 800 communicates with the outside of the housing 800 through openings 805 formed on the upstream side and the downstream side of the housing 800. The shape of the lower housing 803 is a substantially rectangular parallelepiped with the left-right direction as the longitudinal direction. An operation unit 206 for the user to instruct the packaging apparatus 1 to start or stop the packaging operation is provided in the lower casing 803.

< Receivers 12, 13>
The cradle 12 extends in the horizontal direction from the upper end of the upstream side surface of the lower housing 803 toward the upstream side. The cradle 13 extends in the horizontal direction from the upper end of the downstream side surface of the lower housing 803 toward the downstream side. The shapes of the cradles 12 and 13 are box-like shapes that are substantially rectangular in plan view with the conveying direction as the longitudinal direction. The cradle 12 receives the pedestal 2 conveyed toward the opening 805 on the upper surface. The cradle 13 receives the pedestal 2 and the article 3 whose packaging has been completed on the upper surface. The leg portions 121 and 131 support the cradle 12 and 13 from below.

The upper surface of the cradle 12 is referred to as “receiving surface 12A”, and the upper surface of the cradle 13 is referred to as “receiving surface 13A”. The receiving surfaces 12A and 13A are horizontal and form substantially the same plane. The plane formed by the receiving surfaces 12A and 13A can smoothly transport the pedestal 2. A portion where the pedestal 2 is transported on the receiving surfaces 12A and 13A is referred to as a “transport path 103” (see FIG. 11).

As shown in FIG. 2, the packaging device 1 includes a bottom portion 10 and side plate members 111 and 112. The shape of the bottom 10 is a rectangular shape in plan view. The side plate member 111 extends in the upward vertical direction from the right end portion of the bottom portion 10. The side plate member 112 extends in the upward vertical direction from the left end portion of the bottom portion 10. Each shape of the side plate members 111 and 112 is a substantially rectangular plate shape whose longitudinal direction is the vertical direction. The inner surfaces of the side plate members 111 and 112 face each other. The cradle 12 is supported by end portions on the upstream side of the side plate members 111 and 112. The cradle 13 is supported by the downstream ends of the side plate members 111 and 112.

<Transport mechanism 50>
As shown in FIG. 3, endless belts 511 and 512 are provided at the right end and the left end of the cradles 12 and 13, respectively. Each of the belts 511 and 512 has teeth on the inner surface. The belt 511 is bridged between a pair of pulleys 52A and 52B. The pulley 52A is provided on the upstream side of the right side surface of the cradle 12 so as to be rotatable about a shaft member 56A (see FIG. 4). The pulley 52B is provided on the downstream side of the right side surface of the cradle 13 so as to be rotatable about a shaft member 56B (see FIG. 4). The pulleys 52A and 52B are in contact with the inside of the belt 511, and support the belt 511 in a rotatable manner. The belt 512 is stretched over a pair of pulleys 53A and 53B. The pulley 53A is provided on the upstream side of the left side surface of the cradle 12 so as to be rotatable about a shaft member 56A (see FIG. 4). The pulley 53B is provided on the downstream side of the left side surface of the cradle 13 so as to be rotatable about a shaft member 56B (see FIG. 4). The pulleys 53A and 53B are in contact with the inside of the belt 512 and support the belt 512 rotatably. As shown in FIG. 4, the pulleys 52A and 53A are connected by a shaft member 56A extending in the left-right direction. The cradle 12 rotatably supports the shaft member 56A at the upstream end. The pulleys 52B and 53B are connected by a shaft member 56B extending in the left-right direction. The cradle 13 rotatably supports the shaft member 56B at the downstream end.

As shown in FIG. 3, portions of the outer surfaces of the belts 511 and 512 facing upward are exposed to the receiving surfaces 12A and 13A and extend in the transport direction. A conveying unit 60 is provided on each outer surface of the belts 511 and 512. The conveyance unit 60 includes a right conveyance unit 61 provided on the belt 511 and a left conveyance unit 62 provided on the belt 512. The right transport unit 61 protrudes in the vertical direction and the outward direction with respect to the outer surface of the belt 511. The left conveyance unit 62 protrudes in the vertical direction and the outward direction with respect to the outer surface of the belt 512. In the transport unit 60, the right transport unit 61 and the left transport unit 62 face each other in the left-right direction.

The right transport unit 61 includes a first transport unit 61A and a second transport unit 61B. The first transport unit 61A and the second transport unit 61B are separated in the transport direction. In the first conveyance unit 61A, a portion of the upstream side surface that is close to the belt 511 is recessed downstream. The left transport unit 62 includes a first transport unit 62A and a second transport unit 62B. The first transport unit 62A and the second transport unit 62B are separated in the transport direction. In the first conveyance unit 62A, a portion of the upstream side surface close to the belt 512 is recessed downstream. The first transport units 61A and 62A hold a pedestal 2 described later from above. The second transport units 61B and 62B push the pedestal 2 upstream or downstream.

A motor 222 (see FIG. 4) is provided in the bottom 10 (see FIG. 2) on the lower side of the cradle 12 (see FIG. 3). As shown in FIG. 4, the rotation shaft of the motor 222 extends in the left-right direction and protrudes from the left side surface of the motor 222 to the left side. A plurality of transmission gears 55 </ b> A are provided on the left side of the motor 222. The plurality of transmission gears 55 </ b> A rotate according to the rotation of the motor 222. A pulley 55D is provided on the left side of the center in the left-right direction of the shaft member 56A. A belt 55B is bridged between one of the plurality of transmission gears 55A and the pulley 55D. The belt 55B rotates in response to the rotation of the plurality of transmission gears 55A, and transmits the rotational driving force to the pulley 55D. The pulleys 52A and 53A rotate according to the rotation of the pulley 55D. The belts 511 and 512 rotate according to the rotation of the pulleys 52A and 53A.

In accordance with the rotation of the motor 222, when the pulleys 52A and 53A rotate counterclockwise when viewed from the right side, the belts 511 and 512 rotate counterclockwise. Accordingly, the transport unit 60 transports the base 2 from the upstream side to the downstream side, as will be described later. On the other hand, when the pulleys 52A and 53A rotate in the clockwise direction as viewed from the right side according to the rotation of the motor 222, the belts 511 and 512 rotate in the clockwise direction. Accordingly, the transport unit 60 transports the base 2 from the downstream side to the upstream side, as will be described later. Hereinafter, the rotation direction of the motor 222 and the belts 511 and 512 when the pedestal 2 is conveyed from the upstream side to the downstream side is referred to as a “forward direction”. The direction of rotation opposite to the forward direction is referred to as “reverse direction”. The belts 511 and 512, the conveyance unit 60, and the motor 222 are collectively referred to as “conveyance mechanism 50”.

In addition, the description of the rotation direction (clockwise or counterclockwise) below indicates the direction when the packaging device 1 is viewed from the right side, unless otherwise specified.

<Action mechanism 20>
As shown in FIG. 2, the film roll 22 is detachably mounted on the inner side of each upper end portion of the side plate members 111 and 112. Hereinafter, the part inside each upper end part of the side plate members 111 and 112 and to which the film roll 22 is mounted is referred to as “film roll mounting part 11A”. The film roll 22 has a film 24 (see FIG. 1) and a substantially cylindrical winding shaft (not shown). The film 24 is wound around a winding shaft. A film gear 23B is provided on the right side surface of the winding shaft. The film gear 23B meshes with the connecting gear 651 from the upstream side with the film roll 22 mounted on the film roll mounting portion 11A.

Rollers 654A and 654B (see FIG. 11 and the like) are provided on the upstream side of the film roll mounting portion 11A. The rollers 654A and 654B are columnar members that extend between the side plate members 111 and 112 in the left-right direction. The roller 654B is disposed on the downstream side with respect to the roller 654A. The rollers 654A and 654B are rotatably supported by the side plate members 111 and 112 on both sides in the left-right direction. The film 24 fed out from the film roll 22 is sandwiched from both sides in the transport direction by the rollers 654A and 654B.

The rotational driving force of the motor 227 (see FIG. 7) is selectively transmitted to the connecting gear 651 and the roller 654A. When the motor 227 rotates in a predetermined direction while the rotational driving force of the motor 227 is transmitted to the connection gear 651, the film gear 23B rotates counterclockwise. When the film gear 23 </ b> B rotates counterclockwise, the film 24 is wound around the film roll 22. Hereinafter, the rotation direction (predetermined direction) of the motor 227 when the film 24 is wound on the film roll 22 is referred to as a “first direction”.

On the other hand, when the motor 227 rotates in the direction opposite to the first direction while the rotational driving force of the motor 227 is transmitted to the roller 654A, the roller 654A rotates counterclockwise. When the roller 654A rotates counterclockwise, the roller 654A feeds the film 24 sandwiched between the roller 654A from the film roll 22. Hereinafter, the rotation direction (the direction opposite to the first direction) of the motor 227 when the motor 227 is unwound from the film roll 22 is referred to as a “second direction”.

Solenoid 16C (see FIG. 7) switches whether the rotational driving force of motor 227 is transmitted to connecting gear 651 or to roller 654A. Hereinafter, the motor 227, the rollers 654A and 654B, the connecting gear 651, and the solenoid 16C are referred to as the “action mechanism 20”.

<Guiding mechanism 39>
As shown in FIG. 2, a carriage 349 that is driven by the rotation of the motor 221 is provided on the right side surface of the side plate member 111. The carriage 349 is connected to a support member 341 (see FIG. 5). A carriage 350 is provided on the left side surface of the side plate member 112. The carriage 350 is connected to a support member 342 (see FIG. 5).

As shown in FIG. 5, the shapes of the support members 341 and 342 are symmetrical. Support members 341 and 342 are spaced apart in the left-right direction. Hereinafter, the support member 341 will be described, and the description of the support member 342 will be omitted. The support member 341 includes a base portion 341A, a first extension portion 341B, a second extension portion 341C, and a third extension portion 341D. The base portion 341A, the first extending portion 341B, the second extending portion 341C, and the third extending portion 341D are plate-shaped. The respective planes of the base portion 341A, the first extending portion 341B, the second extending portion 341C, and the third extending portion 341D face the left-right direction.

The shape of the base portion 341A is substantially rectangular in a side view. The first extending portion 341B extends horizontally from the lower portion of the downstream end of the base portion 341A toward the downstream side. The shape of the first extending portion 341B is substantially rectangular in a side view. The second extending portion 341C extends horizontally from the upper portion of the downstream end of the base portion 341A toward the downstream side. The shape of the second extending portion 341C is substantially rectangular in a side view. The downstream end of the second extending portion 341C is disposed on the downstream side of the downstream end of the first extending portion 341B. The upper end of the first extending portion 341B and the lower end of the second extending portion 341C are spaced apart in the vertical direction to form a gap 3414 extending in the transport direction. The third extending portion 341D extends vertically upward from a portion on the upstream side of the upper end of the base portion 341A. The shape of the third extending portion 341D is substantially rectangular in a side view. A plurality of holes aligned in the vertical direction are formed in the base 341A and the third extending portion 341D. Screws for connecting the support member 341 to the carriage 349 (see FIG. 2) are inserted through the plurality of holes.

The base part 342A, the first extension part 342B, the second extension part 342C, and the third extension part 342D of the support member 342 are respectively the base part 341A, the first extension part 341B, and the second extension part of the support member 341. It corresponds to the installation part 341C and the third extension part 341D. A gap 3424 between the first extending part 342B and the second extending part 342C corresponds to a gap 3414 between the first extending part 341B and the second extending part 341C. Screws for connecting the support member 342 to the carriage 350 (see FIG. 2) are inserted through the plurality of holes of the base portion 342A and the third extending portion 342D. Hereinafter, the support members 341 and 342 are collectively referred to as “a pair of support members 34”. The bases 341A and 342A are collectively referred to as “a pair of bases 34A”. The first extending portions 341B and 342B are collectively referred to as “a pair of first extending portions 34B”. The second extending portions 341C and 342C are collectively referred to as “a pair of second extending portions 34C”.

The guide rollers 30 (see FIG. 11), 31, 32 (see FIG. 11) are disposed between the downstream portions of the pair of first extending portions 34B. The right ends of the guide rollers 30 to 32 are supported by the first extending portion 341B. The left ends of the guide rollers 30 to 32 are supported by the first extending portion 342B. The guide roller 33 is disposed between the pair of base portions 34A. The right end of the guide roller 33 is supported by the base 341A. The left end of the guide roller 33 is supported by the base 342A. The erection member 35 is disposed in the upstream portion of the pair of second extending portions 34C. The left end of the erection member 35 is supported by the second extending portion 341C. The left end of the erection member 35 is supported by the second extending portion 342C.

As shown in FIG. 11, the guide rollers 30 and 32 are arranged horizontally. The lower ends of the guide rollers 30 and 32 slightly protrude below the lower end of the first extending portion 342B. The guide roller 31 is disposed above the guide rollers 30 and 32. The upper end of the guide roller 31 slightly protrudes above the upper end of the first extending portion 342B. The guide roller 33 is disposed above the guide roller 31. The installation member 35 is disposed above the guide roller 33. Hereinafter, the pair of support members 34, the guide rollers 30 to 33, and the installation member 35 are referred to as a “guide mechanism 39”.

As shown in FIG. 2, the motor 221 can move the guide mechanism 39 in the vertical direction via the carriages 349 and 350. FIG. 11 shows a state in which the guide mechanism 39 is disposed at the uppermost position. In this state, of the support members 342 of the pair of support members 34, the third extending portion 342 </ b> D is disposed in the vicinity of the upstream side and the lower side of the film roll 22. The first extending portion 342 </ b> B and the second extending portion 342 </ b> C are disposed below the film roll 22. The guide rollers 30 to 33 and the installation member 35 are disposed below the film roll 22.

FIG. 14 shows a state where the guide mechanism 39 is arranged at the lowest position. In this state, the first extending portion 342 </ b> B of the support members 342 of the pair of support members 34 is disposed below the conveyance path 103. The guide rollers 30 to 32 supported by the pair of first extending portions 34B are disposed below the conveyance path 103. The guide roller 31 contacts the conveyance path 103 from below. The second extending portion 342C is disposed on the upper side of the first extending portion 342B with the conveyance path 103 interposed therebetween. The guide roller 33 and the erection member 35 are disposed on the upper side of the conveyance path 103. The gap 3424 (see FIG. 5) is arranged along the transport path 103. Hereinafter, as illustrated in FIG. 11, the movement path of the guide roller 30 accompanying the movement of the pair of support members 34 is referred to as “movement path 104”. A position where the conveyance path 103 and the movement path 104 intersect is referred to as an “intersection position 105”.

<Holding mechanism 70 (pedestal guide roller 71, holding roller 72)>
As shown in FIG. 2, a pedestal guide roller 71 extending in the left-right direction is provided on the upstream side of the portion sandwiched between the side plate members 111 and 112 (see FIG. 2) and below the conveyance path 103 (see FIG. 11 and the like). It is done. The pedestal guide roller 71 contacts the conveyance path 103 from below. The pedestal guide roller 71 supports the pedestal 2 conveyed from the upstream side to the downstream side along the conveyance path 103 from below between the cradles 12 and 13, and guides the pedestal 12 from the cradle 12 to the cradle 13. As shown in FIG. 6, a pair of plate-like members 70 </ b> B are disposed below the pedestal guide roller 71. The left and right sides of the pedestal guide roller 71 are rotatably supported by a pair of plate-like members 70B.

A pair of holding members 78 are provided on the left and right outer sides of the pair of plate-like members 70B. The pair of holding members 78 can rotate with a projecting portion 70 </ b> D projecting from the pair of plate-like members 70 </ b> B to the left and right outside as a fulcrum. Of the pair of holding members 78, a holding roller 72 is provided on the side opposite to the side supported by the protrusion 70 </ b> D. The left and right ends of the holding roller 72 are rotatably supported by a pair of holding members 78. The pair of holding members 78 are rotated by a motor 226 (see FIG. 7). Due to the rotation of the pair of holding members 78, the holding roller 72 is close to the downstream side of the pedestal guide roller 71 (see FIG. 6) and the holding roller 72 is separated from the pedestal guide roller 71 (see FIG. 13 and the like). And switch to Hereinafter, a state in which the holding roller 72 is close to the downstream side of the base guide roller 71 is referred to as a “first state”. A state in which the holding roller 72 is separated from the pedestal guide roller 71 is referred to as a “second state”. The pedestal guide roller 71 and the holding roller 72 are collectively referred to as “holding mechanism 70” (see FIG. 6).

As shown in FIG. 11, when the holding mechanism 70 is in the first state, the lower end portion of the film 24 fed out from the film roll 22 can be held between the holding roller 72 and the pedestal guide roller 71 and held. Become. On the other hand, when the holding mechanism 70 is in the second state, the lower end portion of the film 24 fed out from the film roll 22 is released from the holding roller 72 and the pedestal guide roller 71 as shown in FIG.

<Heating mechanism 86>
As shown in FIG. 6, a heating mechanism 86 is provided on the downstream side of the holding mechanism 70. The heating mechanism 86 includes five heating units 861, a holding member 862, and a pedestal member 863.

Each of the five heating units 861 has a substantially rectangular parallelepiped shape. Each heating unit 861 has a heater 861A on its upper surface. The heater 861A is a resistance heating type heater that heats by passing an electric current. The five heating units 861 have two projecting portions 861B projecting from the downstream surface toward the downstream side. The two protrusions 861B are arranged in the left-right direction, respectively.

The holding member 862 is a substantially U-shaped member in a side view. The holding member 862 has a groove extending in the left-right direction. The length in the left-right direction of the holding member 862 is substantially the same as the length in the left-right direction of the cradle 12, 13 (see FIG. 2). The five heating units 861 are arranged inside the groove of the holding member 862. The five heating units 861 are aligned in the left-right direction. A plurality of long hole portions 862 </ b> A are provided in the plate-like member on the downstream side of the holding member 862. The plurality of long hole portions 862A are long holes that are long in the vertical direction. The plurality of long hole portions 862A are arranged in the left-right direction. Each of the two protruding portions 861B of the five heating units 861 enters the plurality of elongated hole portions 862A from the upstream side and protrudes to the downstream side. The five heating units 861 can move in the vertical direction by the length in the vertical direction of the plurality of elongated holes 862A. A plurality of springs (not shown) are connected to the lower side of the groove of the holding member 862 to urge the five heating units 861 upward. The upper surfaces of the five heating units 861 are arranged above the upper ends of the holding members 862.

The base member 863 supports the holding member 862 from below. The pedestal member 863 has a pair of rack gears 863A at the left and right ends of the downstream side surface. The pair of rack gears 863 </ b> A extend in the vertical direction with their teeth facing downstream. A motor 223 (see FIG. 7) is provided on the downstream side of the base member 863. The pinion gear connected to the rotating shaft of the motor 223 meshes with the right side of the pair of rack gears 863A. As the motor 223 rotates, the base member 863 moves in the vertical direction. As a result, the holding member 862 and the five heating units 861 also move in the vertical direction. As shown in FIG. 11, when the five heating units 861 are arranged at the lowest position, the heaters 861 </ b> A on the respective upper surfaces are separated downward from the conveyance path 103. On the other hand, when the five heating units 861 are arranged at the uppermost position as shown in FIG. 12, the heaters 861 </ b> A on the respective upper surfaces are arranged slightly above the conveyance path 103.

As shown in FIG. 6, the plate-like lid member 87 is disposed on the upper surface of the heater 861 </ b> A on each upper surface with the five heating units 861 disposed at the lowest position. The upstream end of the lid member 87 is rotatably supported by a pair of plate-like members 70B. The lid member 87 covers the heaters 861A on the upper surfaces from the upper side in a state where the five heating units 861 are disposed at the lowest position. The lid member 87 rotates in the process in which the five heating units 861 move from the lowest position to the highest position. The lid member 87 does not cover the heaters 861A on the upper surfaces of the five heating units 861 arranged in the uppermost position.

<Rotation suppression mechanism 80>
As shown in FIG. 6, the rotation suppression mechanism 80 is provided on the downstream side of the heating mechanism 86. The rotation suppression mechanism 80 includes plate- like members 84 and 85. The plate-like member 85 is a plate-like member fixed to the packaging device 1. The plate-like member 85 supports the pair of support rods 85A on both the left and right sides. The plate member 84 is disposed on the upper side of the plate member 85. The plate-like member 84 has holes that penetrate in the transport direction on both the left and right sides. Each of the pair of support rods 85 </ b> A is inserted through holes on the left and right sides of the plate-like member 84. The plate-like member 84 is movable in the transport direction along the pair of support bars 85A.

The pair of support bars 82 extend horizontally from the plate-like member 84 to the upstream side. The stopper 81 is provided at the upstream end of the pair of support bars 82. The shape of the stopper 81 is a bar shape having a square cross-sectional shape. The stopper 81 extends in the left-right direction. The cam 83 is connected to a rotating shaft that extends upward from the left-right center of the plate-like member 85. A motor 224 (see FIG. 7) is provided below the plate member 85. The cam 83 rotates according to the rotation of the motor 224. The cam 83 comes into contact with the protruding portion 84A protruding upward from the left and right center of the plate-like member 84 from the upstream side. When the motor 224 rotates the cam 83, the plate member 84 moves in the transport direction. As the plate member 84 moves in the transport direction, the pair of support bars 82 and the stopper 81 also move in the transport direction.

When the guide mechanism 39 is disposed at the lowest position and the stopper 81 moves to the upstream side (see FIG. 15), the stopper 81 is disposed at a position close to the guide roller 30 from the downstream side. In this case, the rotation of the guide roller 30 is restricted by the stopper 81. On the other hand, when the stopper 81 moves to the downstream side (see FIG. 17), the stopper 81 is separated to the downstream side with respect to the guide roller 30 even when the guide mechanism 39 is disposed at the lowest position.

<Cutting unit 77, sensor 205>
As shown in FIG. 16, a guide rail 74 extending in the left-right direction is provided below the intersection position 105. The cutting part 77 has a hole penetrating in the left-right direction. The cutting part 77 is movable in the left-right direction along the guide rail 74. The cutting portion 77 includes a blade portion 771 that protrudes upward and extends in the left-right direction. The motor 225 (see FIG. 7) moves the cutting portion 77 in the left-right direction along the guide rail 74.

The sensor 205 (see FIG. 7) is provided in the internal space of the cradle 13. The sensor 205 is a non-contact sensor (reflective sensor) provided below the belt 512. The sensor 205 can detect a reflector provided on the belt 512.

<Pedestal 2>
The pedestal 2 will be described with reference to FIG. The pedestal 2 is produced by bending a substantially rectangular plate-shaped portion 90 with bent portions 911 and 912. The bent portions 911 and 912 are folds extending in the transport direction and arranged at intervals in the left-right direction. A portion sandwiched between the bent portions 911 and 912 in the plate-like portion 90 is referred to as a “first plate-like portion 905”. A portion of the plate-like portion 90 that stands up from the bent portion 911 is referred to as a “second plate-like portion 906”. A portion of the plate-like portion 90 that stands from the bent portion 912 is referred to as a “second plate-like portion 907”. The first plate-like portion 905 has a plurality of holes 927 formed at equal intervals along the bent portions 911 and 912. The plurality of holes 927 formed in the bent portion 911 and the plurality of holes 927 formed in the bent portion 912 are arranged in the left-right direction.

The plurality of holes 927 can be attached with the transport unit 60, respectively. Specifically, as shown in FIG. 1, when the operator places the pedestal 2 on the receiving base 12, each of the plurality of holes 927 has a pair of holes 927 on the downstream side in the transport direction, and the transport unit 60 Install. Thereby, the conveyance part 60 attached to a pair of hole 927 can convey the base 2 to the downstream of a conveyance direction.

<Electrical configuration>
The electrical configuration of the packaging device 1 will be described with reference to FIG. The packaging device 1 includes a CPU 201, a flash memory 202, a RAM 203, a sensor 205, an operation unit 206, a display unit 207, a solenoid 16C, and a heater 861A. The CPU 201 controls the entire packaging device 1. The CPU 201 executes a program stored in the flash memory 202 to execute a process of packaging the article 3 placed on the pedestal 2 with the film 24.

The flash memory 202 stores a packaging process program executed by the CPU 201. The flash memory 202 stores a first rotation total number, a second rotation total number, a tension setting value, a width setting value, an initial frequency, and an initial DUTY ratio. The first total number of rotations indicates the total number of rotations of the motor 227 in the first direction. The total number of second rotations indicates the total number of rotations of the motor 227 in the second direction. The first rotation total number and the second rotation total number are referred to by the CPU 201 when the diameter of the film roll 22 is calculated based on the remaining amount of the film 24 wound around the film roll 22. The tension set value is a set value of the tension of the film 24. The width setting value is a setting value of the width of the film 24. The tension setting value and the width setting value are stored in the flash memory 202 when the tension and width input operation performed through the operation unit 206 is detected. The initial frequency is a set value of the frequency of the initial pulse signal. The initial DUTY ratio is a set value of the DUTY ratio of the initial pulse signal.

The packaging apparatus 1 includes drive units 211 to 217, motors 221 to 227, and encoders 232 and 237. The driving units 211 to 217 drive the motors 221 to 227 by outputting pulse signals to the motors 221 to 227, respectively. The motors 221 to 227 are DC motors. The encoder 232 outputs a number of pulse signals corresponding to the rotation of the motor 222. The encoder 237 outputs a number of pulse signals corresponding to the rotation of the motor 227. The CPU 201 is electrically connected to the flash memory 202, RAM 203, sensor 205, operation unit 206, display unit 207, solenoid 16C, heater 861A, drive units 211 to 217, and encoders 232 and 237. The driving units 211 to 217 are electrically connected to the motors 221 to 227, respectively.

<Packaging processing>
A packaging process (see FIGS. 8A, 8B, and 9) executed by the CPU 201 of the packaging apparatus 1 will be described with reference to FIGS. 8A to 17. When the packaging apparatus 1 is powered on, the CPU 201 starts the packaging process by reading and executing the program stored in the flash memory 202. 11 to 17 are sectional views taken along the line AA in FIG.

As shown in FIG. 8A, the CPU 201 initializes the state of the packaging device 1 (S1). Specifically, it is as follows. The CPU 201 arranges the guide mechanism 39 at the top (see FIG. 11). The CPU 201 rotates the belts 511 and 512 (see FIG. 11) of the transport mechanism 50 until the sensor 205 (see FIG. 7) detects the reflecting plate, and the transport unit from the receiving surface 12A (see FIG. 3) of the cradle 12. 60 is projected upward (see FIG. 11). The CPU 201 lowers the heating mechanism 86 and places it at the lowest position. The heater 861A (see FIG. 6) of each heating unit 861 (see FIG. 6) is separated downward from the transport path 103 (see FIG. 11). The CPU 201 moves the stopper 81 downstream (see FIG. 11). The CPU 201 drives the solenoid 16C so that the rotational driving force is transmitted to the connecting gear 651 (see FIG. 2). The CPU 201 swings the pair of holding members 78 and separates the holding roller 72 from the pedestal guide roller 71 to switch the holding mechanism 70 to the second state (for example, see FIG. 13).

When the user mounts the unused film roll 22 and turns on the power of the packaging apparatus 1, an input operation for notifying the packaging apparatus 1 that the unused film roll 22 is mounted is performed via the operation unit 206. Do it. When detecting this input operation, the CPU 201 sets 0 to the first total rotation number and the second total rotation number stored in the flash memory 202 by the initialization process (S1). When the input operation for notifying that the unused film roll 22 is loaded is not detected, the CPU 201 does not set 0 for the first total rotation number and the second total rotation number.

The CPU 201 starts a process of updating the first total rotation number or the second total rotation number stored in the flash memory 202 based on the pulse signal output from the encoder 237 when the motor 227 rotates (S11). . Specifically, when the CPU 201 detects a pulse signal output from the encoder 237 in response to the rotation of the motor 227 in the first direction, the CPU 201 specifies the number of rotations of the motor 227 based on the detected pulse signal. The CPU 201 updates the first total rotation number stored in the flash memory 202 with the specified rotation number. When the CPU 201 detects the pulse signal output from the encoder 237 in response to the rotation of the motor 227 in the second direction, the CPU 201 specifies the rotation speed of the motor 227 based on the detected pulse signal. The CPU 201 updates the second total number of revolutions stored in the flash memory 202 with the identified number of revolutions.

The user unwinds the film 24 from the film roll 22 and sandwiches the film 24 from both sides in the transport direction by the rollers 654A and 654B. The user further feeds out the film 24 and passes the film 24 to the upstream side of the guide roller 33. The user further feeds out the film 24 and arranges the lower end portion of the film 24 below the transport path 103 (see FIG. 11) and downstream of the pedestal guide roller 71.

The operating mechanism 20 (see FIG. 2) is in a state where the rotational driving force of the motor 227 is transmitted to the connecting gear 651 (see FIG. 2). When the film roll 22 rotates in response to the film 24 being fed out from the film roll 22, the film gear 23B and the connecting gear 651 rotate, and the motor 227 rotates in the second direction. The CPU 201 specifies the rotation speed of the motor 227 based on the pulse signal output from the encoder 237 when the motor 227 rotates in the second direction. The CPU 201 updates the second total rotation number with the specified rotation number.

The user places the base 2 on the cradle 12 (see FIG. 11). The pedestal 2 is positioned by the transport unit 60. The side 901 of the first plate-like portion 905 of the base 2 is disposed on the downstream side, and the side 902 is disposed on the upstream side. The article 3 is placed on the first plate-like portion 905 of the base 2 (see FIG. 11). The CPU 201 controls the drive unit 216 to drive the motor 226 to move the pair of support members 78 from the second state to the first state. The holding roller 72 is close to the downstream side of the pedestal guide roller 71 and sandwiches the lower end portion of the film 24 between the holding roller 72 and the pedestal guide roller 71. CPU201 judges whether input operation which instruct | indicates the start of packaging was detected via the operation part 206 (S13). If the CPU 201 determines that this input operation is not detected (S13: NO), the process returns to S13. CPU201 advances a process to S15, when it is judged that input operation which instruct | indicates the start of packaging was detected (S13: YES).

CPU 201 rotates motor 222 in the forward direction and rotates belts 511 and 512 in the forward direction (the direction of arrow 181 in FIG. 11). The transport unit 60 transports the base 2 from the upstream side to the downstream side along the transport path 103 (S15). The downstream end (side 901) of the first plate-like portion 905 of the base 2 contacts the film 24, and then passes over the holding roller 72 (arrow 182 in FIG. 12). The side 901 of the first plate-like portion 905 of the base 2 pushes the film 24 to the downstream side. The side 901 of the first plate-like portion 905 of the base 2 approaches the movement path 104 from the upstream side and passes above the five heating units 861 (see FIG. 12). When the film 24 is pushed downstream by the side 901 of the first plate-like portion 905 of the pedestal 2, the lower end portion of the film 24 goes around the lower surface of the first plate-like portion 905 of the pedestal 2.

CPU201 drives solenoid 16C. The solenoid 16C is in a state where the rotational driving force of the motor 227 is transmitted to the roller 654A (see FIG. 2). The CPU 201 is a pulse signal for rotating the motor 227 in the second direction, and is referred to as a predetermined frequency (hereinafter referred to as “feed-out frequency”) and a predetermined DUTY ratio (hereinafter referred to as “feed-out DUTY ratio”). The drive unit 217 is controlled so that the pulse signal) is output from the drive unit 217 to the motor 227 (S17). The motor 227 rotates in the second direction. The rollers 654A and 654B feed out the film 24 from the film roll 22. The film 24 fed out from the film roll 22 moves in a direction from the film roll mounting portion 11A side toward the holding mechanism 70 side. Hereinafter, the direction from the film roll mounting portion 11A side toward the holding mechanism 70 side is referred to as “feeding direction”. The CPU 201 continuously feeds the film 24 by rotating the motor 227 in the second direction until the processing of S33 described later. The CPU 201 continues the control of specifying the number of rotations of the motor 227 based on the pulse signal output from the encoder 237 when the motor 227 rotates in the second direction and updating the second total number of rotations. As shown in FIG. 12, the film 24 is unwound from the film roll 22 by the rollers 654A and 654B and moves in the unwinding direction (arrow 171). The film 24 is loosened.

The CPU 201 determines from the output signal from the encoder 232 whether the side 901 of the first plate-like portion 905 of the base 2 has moved downstream by a predetermined distance from the upper position of the five heating units 861. Judgment based on the number of rotations. When the CPU 201 determines that the side 901 of the first plate-like portion 905 of the pedestal 2 has moved a predetermined distance from the upper position of the five heating units 861, the CPU 201 stops driving the motor 222 and stops the pedestal 2. The downstream conveyance is stopped.

CPU201 drives motor 223 and raises heating mechanism 86 (S19). After the heating mechanism 86 moves to the top, the CPU 201 stops driving the motor 223 and stops the heating mechanism 86 from rising. As shown in FIG. 12, when the heating mechanism 86 is raised to the top (arrow 183), the upper side of the five heating units 861 sandwiches the film 24 between the lower surfaces of the first plate-like portions 905 of the base 2. As shown in FIG. 8A, the CPU 201 heats the heater 861A (S21). The heater 861A heats the end of the film 24 and melts the front end of the film 24. The end of the melted film 24 is welded to the vicinity of the side 901 in the lower surface of the first plate-like portion 905 of the base 2. The CPU 201 stops the heating of the heater 861A after a predetermined time has elapsed since the heating of the heater 861A was started.

The CPU 201 drives the motor 223 to lower the heating mechanism 86 (S23, arrow 184 (see FIG. 13)). The upper sides of the five heating units 861 are separated from the conveyance path 103. When the CPU 201 determines that the heating mechanism 86 has moved to the lowest position, the CPU 201 stops driving the motor 223 and stops the lowering of the heating mechanism 86.

As shown in FIG. 8A, the CPU 201 drives the motor 226 to swing the pair of holding members 78 (S25), and sets the holding mechanism 70 to the second state. As shown in FIG. 13, the pair of holding members 78 swing in the direction of the arrow 185, whereby the holding roller 72 is separated downward from the base guide roller 71. The end of the film 24 is released. As shown in FIG. 8A, the CPU 201 rotates the motor 222 in the forward direction so that the belts 511 and 512 rotate in the forward direction, and transports the base 2 to the downstream side (S27).

As shown in FIG. 13, the end of the film 24 is moved to the downstream side with the movement of the pedestal 2 while being welded to the lower surface of the pedestal 2 (arrow 186). As the pedestal 2 moves downstream, the side 901 of the first plate-like portion 905 of the pedestal 2 and the downstream end of the article 3 come into contact with the film 24 and bend at the contact portion. The CPU 201 controls the driving unit 212 to continuously drive the motor 222 to continuously rotate the belts 511 and 512 in the forward direction. A side 902 of the first plate-like portion 905 of the base 2 crosses the intersection position 105 from the upstream side to the downstream side. The film 24 is disposed at a position covering the first plate-like portion 905 of the base 2 and the upper side of the article 3. The guide rollers 30 to 32 are disposed above the film 24 extending above the base 2 and the article 3.

As shown in FIG. 8A, the CPU 201 stops the driving of the motor 222 and stops the conveyance of the base 2. The CPU 201 drives the motor 221 to move the guide mechanism 39 from the highest level to the lowest level (S29). The guide roller 30 moves from the highest position to the lowest position along the movement path 104. In the course of movement, the guide rollers 30 and 32 contact the film 24 disposed below from above, and guide the film 24 downward along the movement path 104 (see arrow 187 and FIG. 14). The film 24 is pressed against the base 2 and the article 3 from above. As shown in FIG. 14, the guide roller 31 is in contact with the conveyance path 103 from below while being moved to the lowest position. The film 24 covers the first plate-like portion 905 of the base 2 and the downstream side, the upper side, and the upstream side of the article 3.

As shown in FIG. 8B, the CPU 201 acquires the initial frequency and the initial DUTY ratio stored in the flash memory 202, and determines the initial pulse signal (S31). The CPU 201 drives the solenoid 16C so that the rotational driving force is transmitted to the connecting gear 651 (see FIG. 2). The CPU 201 outputs an initial pulse signal for rotating the motor 227 in the first direction from the drive unit 217 to the motor 227 (S33). The motor 227 rotates in the first direction. The film 24 is wound on a film roll 22. The film 24 moves in the direction from the holding mechanism 70 side toward the film roll mounting portion 11A side (see arrow 172, FIG. 14). Hereinafter, the direction from the holding mechanism 70 side toward the film roll mounting portion 11A side is referred to as “winding direction”. The CPU 201 specifies the rotation speed of the motor 227 based on the pulse signal output from the encoder 237 when the motor 227 rotates in the first direction. The CPU 201 updates the first total rotation number based on the specified rotation number.

As shown in FIG. 10, when the initial pulse signal is output to the motor 227, the rotational speed of the motor 227 in the first direction is accelerated from the time 0 to the speed V1 with the acceleration W1 from the time t0 to the time t1. Thereafter, during the period from time t1 to time t2, the rotational speed of the motor 227 in the first direction changes constantly at the speed V1. During this time, the rotational acceleration of the motor 227 is zero. Between time t0 and time t2, the film 24 slackened by the film 24 being unwound from the film roll 22 by the process of S17 (see FIG. 8A) is transferred to the film roll 22 by the motor 227 rotating in the first direction. Corresponds to the winding process. As a result of all the loose film 24 being wound on the film roll 22, a load is generated on the motor 227 at the timing of time t2. The rotation of the motor 227 in the first direction is hindered by the generation of a load. The rotational acceleration of the motor 227 decelerates from 0 to an acceleration W2 (W2 <0 <W1) at the timing of time t2.

As shown in FIG. 8B, the CPU 201 calculates the rotational acceleration of the motor 227 based on the number of pulse signals output from the encoder 237 per unit time after the process of S33. The CPU 201 compares the calculated rotational acceleration with a first threshold value Th1 that is smaller than W1 and larger than the acceleration W2 (S35). The calculated rotational acceleration of the motor 227 corresponds to the movement acceleration of the film 24 moving in the winding direction. That is, the CPU 201 compares the movement acceleration in the winding direction of the film 24 with a predetermined threshold value by comparing the rotational acceleration of the motor 227 with the first threshold value Th1. If the CPU 201 determines that the calculated rotational acceleration is greater than or equal to the first threshold Th1 (S35: NO), the process returns to S35. After the unit time has elapsed, the CPU 201 newly calculates the rotational acceleration, and repeats the process of S35 based on the calculated rotational acceleration. When the CPU 201 determines that the calculated rotational acceleration is smaller than the first threshold Th1 (S35: YES), the CPU 201 determines that the moving acceleration in the winding direction of the film 24 is smaller than the predetermined threshold. CPU201 advances processing to S37. As a result, the CPU 201 detects the timing of the time t <b> 2 when all of the film 24 slackened by being drawn out from the film roll 22 is wound on the film roll 22.

The CPU 201 acquires the tension setting value and the width setting value stored in the flash memory 202 (S37). The CPU 201 calculates a difference by subtracting the first total rotation number from the second total rotation number based on the first total rotation number and the second total rotation number stored in the flash memory 202. The CPU 201 specifies the length of the film 24 fed out from the unused film roll 22 based on the calculated difference. The CPU 201 specifies the length of the film 24 remaining on the film roll 22 based on the specified length. The CPU 201 calculates the diameter of the film roll 22 based on the specified length (S39). The CPU 201 substitutes the tension setting value and the width setting value acquired by the process of S37 and the diameter of the film roll 22 calculated by the process of S37 into the first relational expression among a plurality of predetermined relational expressions. To determine the frequency and the DUTY ratio (S41). Hereinafter, the frequency calculated based on the first relational expression is referred to as “first frequency”. The DUTY ratio calculated based on the first relational expression is referred to as “first DUTY ratio”. The pulse signal specified by the first frequency and the first DUTY ratio is referred to as a “first pulse signal”. Note that the initial frequency and the first frequency may be the same or different. The initial DUTY ratio and the first DUTY ratio may be the same or different.

The CPU 201 controls the drive unit 217 to switch the pulse signal output from the drive unit 217 to the motor 227 from the initial pulse signal to the first pulse signal (S43). When the DUTY ratio is different between the initial pulse signal and the first pulse signal, the current output to the motor 227 is changed when the pulse signal output to the motor 227 is switched from the initial pulse signal to the first pulse signal. The initial amount of electricity corresponding to the initial pulse signal is switched to the first amount of electricity corresponding to the first pulse signal. The motor 227 rotates in the first direction, and the film 24 is wound on the film roll 22 (see arrow 172, FIG. 14). The film 24 moves in the winding direction. The CPU 201 specifies the number of rotations of the motor 227 based on the pulse signal output from the encoder 237 when the motor 227 rotates in the first direction, and updates the first total number of rotations.

As shown in FIG. 10, when the first pulse signal is output to the motor 227, the rotational speed of the motor 227 in the first direction is reduced from the speed V1 to the speed V2 from the time t2 to the time t3. During the period from time t2 to time t3, the motor 227 rotates in the first direction so that the film 24 is gradually wound around the film roll 22, and the film 24 is in close contact with the pedestal 2 and part of the article 3. Corresponding to The load generated in the motor 227 gradually increases from time t2 to time t3. For this reason, the rotational acceleration of the motor 227 changes from the acceleration W2 to the acceleration W3 (W2 <W3 <0).

As shown in FIG. 8A, the CPU 201 controls the drive unit 217 by the process of S43, and then calculates the rotation speed of the motor 227 based on the number of pulse signals output from the encoder 237 per unit time. The CPU 201 compares the calculated rotation speed with a second threshold Th2 (see FIG. 10) that is lower than the speed V1 and higher than the speed V2 (S45). The calculated rotation speed of the motor 227 corresponds to the moving speed of the film 24 in the winding direction. That is, the CPU 201 compares the rotational speed of the motor 227 with the second threshold Th2, thereby comparing the moving speed of the film 24 in the winding direction with a predetermined threshold. When the CPU 201 determines that the calculated rotation speed is equal to or greater than the second threshold Th2 (S45: NO), the process returns to S45. After the unit time has elapsed, the CPU 201 newly calculates a rotation speed, and repeats the process of S45 based on the calculated rotation speed. When the CPU 201 determines that the calculated rotation speed is lower than the second threshold Th2 (S45: YES), the CPU 201 determines that the moving speed of the film 24 in the winding direction is lower than the predetermined threshold. CPU201 advances processing to S47. As a result, the CPU 201 detects the timing at which the film 24 comes into close contact with the pedestal 2 and part of the article 3.

The CPU 201 specifies the length of the film 24 fed out from the unused film roll 22 based on the first total rotation number and the second total rotation number stored in the flash memory 202. Next, the CPU 201 specifies the length of the film 24 remaining on the film roll 22 based on the specified length. Next, the CPU 201 calculates the diameter of the film roll 22 based on the specified length (S47). The CPU 201 sets the tension setting value and the width setting value acquired by the process of S37, and the diameter of the film roll 22 calculated by the process of S47, which is different from the first relational expression among the plurality of predetermined relational expressions. By substituting into the relational expression, the frequency and the DUTY ratio are determined (S49). Hereinafter, the frequency calculated based on the second relational expression is referred to as “second frequency”. The DUTYh ratio calculated based on the second relational expression is referred to as “second DUTY ratio”. The pulse signal specified by the second frequency and the second DUTY ratio is referred to as a “second pulse signal”. The second DUTY ratio calculated based on the second relational expression is different from the first DUTY ratio calculated based on the first relational expression.

The CPU 201 controls the drive unit 217 to switch the pulse signal output from the drive unit 217 to the motor 227 from the first pulse signal to the second pulse signal (S51). Note that the DUTY ratio differs between the first pulse signal and the second pulse signal. For this reason, when the pulse signal output to the motor 227 is switched from the first pulse signal to the second pulse signal, the current output to the motor 227 is obtained from the first electric quantity corresponding to the first pulse signal by the second electric quantity. It switches to the 2nd electric quantity corresponding to a pulse signal. The motor 227 rotates in the first direction, and the film 24 is wound on the film roll 22 (see arrow 172, FIG. 14). The film 24 moves in the winding direction. The CPU 201 specifies the number of rotations of the motor 227 based on the pulse signal output from the encoder 237 when the motor 227 rotates in the first direction, and updates the first total number of rotations.

As shown in FIG. 9, the CPU 201 rotates the motor 222 in the reverse direction so that the belts 511 and 512 rotate in the reverse direction (S61). The pedestal 2 moves from the downstream side to the upstream side (see arrow 188, FIG. 14). The side 902 of the first plate-like portion 905 of the pedestal 2 contacts the film 24 and pushes it upstream. The side 902 of the first plate-like portion 905 of the pedestal 2 crosses the intersection position 105 from the downstream side toward the upstream side. The side 902 of the first plate-like portion 905 of the pedestal 2 passes above the five heating units 861 and moves upstream. The film 24 is sandwiched between the lower surface of the first plate-like portion 905 of the base 2 and the guide roller 31. The film 24 goes around to the lower side of the base 2.

The CPU 201 determines from the output signal from the encoder 232 whether the side 902 of the first plate-like portion 905 of the base 2 has moved upstream by a predetermined distance from the upper position of the five heating units 861. Judgment based on the number of rotations. When the CPU 201 determines that the side 902 of the first plate-like portion 905 of the pedestal 2 has moved a predetermined distance upstream from the upper position of the five heating units 861, the CPU 201 controls the driving unit 212 to control the motor 222. The drive is stopped and the conveyance of the base 2 is stopped.

The CPU 201 drives the motor 224 to move the stopper 81 of the rotation suppression mechanism 80 to the upstream side (S63). As shown in FIG. 15, the guide roller 30 that has moved to the lowest position is disposed on the upstream side of the stopper 81 of the rotation suppression mechanism 80. When the stopper 81 moves upstream (arrow 189), the film 24 wound around the guide roller 30 is sandwiched between the stopper 81 and the guide roller 30 and cannot move. The CPU 201 stops the rotation of the motor 227 and stops the winding of the film 24 onto the film roll 22 (S65).

The CPU 201 drives the motor 225 to move the cutting unit 77 from the left side to the right side (S67). The blade portion 771 cuts a portion of the film 24 between two portions that are in contact with the guide rollers 30 and 32. A portion of the film 24 that covers the first plate-like portion 905 and the article 3 of the base 2 is cut off from the film roll 22 side. As shown in FIG. 16, after the film 24 is cut, the cut end of the film 24 extending from the film roll 22 hangs down to the lower side of the pedestal guide roller 71.

As shown in FIG. 9, the CPU 201 drives the motor 226 to swing the pair of holding members 78 (S69), and sets the holding mechanism 70 to the first state. As shown in FIG. 16, the pair of holding members 78 swings in the direction of the arrow 190. An end portion of the film 24 cut by the cutting portion 77 is sandwiched between the pedestal guide roller 71 and the holding roller 72.

As shown in FIG. 9, the CPU 201 drives the motor 223 to raise the heating mechanism 86 (S71). After the heating mechanism 86 has moved to the highest position, the CPU 201 stops driving the motor 223 and stops the heating mechanism 86 from rising. With the heating mechanism 86 moved to the top (see arrow 191, FIG. 16), the heater 861 </ b> A of each heating unit 861 approaches the transport path 103 from below. The heater 861A sandwiches the film 24 between the base 2 and the heater 861A. The CPU 201 heats the heater 861A (S73). The heater 861 </ b> A heats the end portion of the film 24 cut by the cutting portion 77 to melt the film 24. The melted film 24 is welded in the vicinity of the side 902 of the first plate-like portion 905 of the base 2. The film 24 cut from the film roll 22 covers the base 2 and the article 3. CPU201 stops heating of heater 861A.

The CPU 201 drives the motor 223 to lower the heating mechanism 86 (S75, arrow 192 (see FIG. 17)). The heater 861 </ b> A of each heating unit 861 is separated from the conveyance path 103. When the heating mechanism 86 moves to the lowest position, the CPU 201 stops the rotation of the motor 223 and stops the lowering of the heating mechanism 86.

The CPU 201 drives the motor 224 to move the stopper 81 of the rotation suppression mechanism 80 to the downstream side (S77, arrow 193 (see FIG. 17)). The stopper 81 moves downstream and is separated from the guide roller 30. The CPU 201 rotates the motor 222 in the forward direction so that the belts 511 and 512 rotate in the forward direction. The pedestal 2 is conveyed downstream (S79, arrow 194 (see FIG. 17)). The pedestal 2 and the article 3 that have been packaged are conveyed downstream. The CPU 201 ends the packaging process.

<Main functions and effects of this embodiment>
As described above, the CPU 201 of the packaging device 1 moves the guide roller 30 from the upper side to the lower side of the conveyance path 103 in the movement path 104, and then rotates the motor 227 in the first direction to wind the film 24. Move in the taking direction (S33, S43, S51). CPU201 determines the timing which starts the movement to the upstream of the base 2 based on the moving speed of the film when moving the film 24 in the winding direction (S45), and starts a movement (S61). The CPU 201 continues to move the film 24 in the winding direction while moving the pedestal 2 toward the upstream side. For this reason, the CPU 201 can prevent the film 24 from being loosened during the movement of the base 2 to the upstream side and the tension of the film 24 from being lowered. Therefore, the packaging apparatus 1 can wrap the film 24 in close contact with the article 3.

The CPU 201 determines the first pulse signal immediately before causing the motor 227 to output the first pulse signal from the drive unit 217 (S43) (S41). The first pulse signal is determined based on the diameter, tension setting value, and width setting value of the film roll 22 immediately before outputting the first pulse signal. For this reason, the CPU 201 can determine an optimum pulse signal corresponding to the diameter, tension setting value, and width setting value of the film roll 22 as the first pulse signal. Further, the CPU 201 determines the second pulse signal immediately before the driving unit 217 outputs the second pulse signal to the motor 227 (S51) (S49). The second pulse signal is determined based on the diameter, tension setting value, and width setting value of the film roll 22 immediately before the second pulse signal is output. Therefore, the CPU 201 can determine the optimum pulse signal corresponding to the diameter, tension setting value, and width setting value of the film roll 22 as the second pulse signal.

CPU201 determines the 1st pulse signal and the 2nd pulse signal which are different from each other (S41, S49). As a result, the CPU 201 starts driving the pedestal 2 upstream (S61) and moves the film 24 in the winding direction (S43). The driving condition of the motor 227 when moving the film 24 in the winding direction during the movement (S49) can be made different.

The CPU 201 determines the first pulse signal and the second pulse signal based on the diameter of the film roll 22 (S41, S49). In addition, when the diameter of the film roll 22 is different, even when the driving conditions of the motor 227 (for example, rotation speed, rotation speed, etc.) are the same, the movement conditions (for example, movement speed, movement amount, etc.) of the film 24 in the winding direction. ) Is different. On the other hand, the CPU 201 can switch the driving condition of the motor 227 in accordance with the diameter of the film roll 22. Therefore, the CPU 201 can move the film 24 in the winding direction at a desired moving speed, or move the film 24 in the winding direction by a desired moving amount.

The CPU 201 determines the first pulse signal and the second pulse signal according to the width setting value of the film 24 (S41, S49). When the width of the film 24 is different, even when the driving conditions of the motor 227 are the same, the tension acting on the film 24 may be different when the film 24 is moved in the winding direction. On the other hand, the CPU 201 can switch the driving condition of the motor 227 according to the width of the film 24. Therefore, the CPU 201 can apply a desired tension to the film 24 regardless of the width of the film 24 when the film 24 is moved in the winding direction.

The CPU 201 determines the first pulse signal and the second pulse signal according to the tension setting value (S41, S49). Therefore, the CPU 201 can apply the set tension to the film 24.

When the film 24 is wound around the film roll 22 in accordance with the rotation of the motor 227 in the first direction, the load generated on the motor 227 gradually increases as the film 24 comes into close contact with the base 2 and the article 3. The rotational speed of the motor 227 is reduced. On the other hand, when the CPU 201 determines that the rotation speed of the motor 227 is smaller than the second threshold Th2 (S45: YES), the CPU 201 moves the base 2 from the downstream side to the upstream side (S61). Therefore, the CPU 201 can start the movement of the base 2 to the upstream side after the film 24 is in close contact with the article 3.

The CPU 201 controls the driving unit 217 after the guide roller 30 has moved to the lower side of the conveying path 103 in the moving path 104 (S29), and outputs an initial pulse signal from the driving unit 217 to the motor 227 (S33). The film 24 starts moving in the winding direction. When the CPU 201 determines that the rotational acceleration of the motor 227 is smaller than the first threshold Th1 (S35: YES), the CPU 201 controls the drive unit 217 to output the first pulse signal from the drive unit 217 to the motor 227 (S43). . In this case, the CPU 201 can switch the driving condition of the motor 227 at the time when the motor 227 starts decelerating (time t2, see FIG. 10).

After the movement of the film 24 in the winding direction is started (S33), the CPU 201 starts the movement of the base 2 to the upstream side (S61), and after the movement of the base 2 to the upstream side is completed, the film 24 The movement in the winding direction is finished (S65). In this case, the CPU 201 appropriately detects that the tension of the film 24 decreases during the movement of the base 2 to the upstream side, and moves the film 24 in the winding direction while the base 2 moves to the upstream side. Can be suppressed.

In the step of conveying the pedestal 2 and the article 3 to the upstream side (S61), tension is applied to the film 24 by moving in the winding direction (S31 to S51). As the pedestal 2 and the article 3 come into contact with the film 24 from the downstream side, a force directed toward the downstream side acts on the transport unit 60. Assuming that the rotational driving force of the motor 222 is transmitted to the pulleys 52B and 53B that support the belts 511 and 512 on the downstream side, when the motor 222 rotates, the conveyance unit 60 is connected to the belts 511 and 512. It is assumed that the part between the pulley and the pulleys 52B and 53B bends.

In contrast, the motor 222 of the transport mechanism 50 transmits the rotational driving force to the pulleys 52A and 53A that support the belts 511 and 512 on the upstream side. That is, the motor 222 moves the pedestal 2 attached to the conveyance unit 60 to the upstream side by pulling the conveyance unit 60 from the upstream side via the pulleys 52A and 53A and the belts 511 and 512. In this case, since the conveyance mechanism 50 can suppress the occurrence of bending of the belts 511 and 512, the pedestal 2 and the article 3 can be appropriately conveyed upstream.

<Modification>
The present invention is not limited to the above embodiment, and various modifications can be made. In the above embodiment, the CPU 201 determines that the rotation speed of the motor 227 is smaller than the second threshold Th2 (S45: YES), and then calculates the diameter of the film roll 22 (S47). The CPU 201 determines the second pulse signal based on the calculated diameter and the tension setting value and width setting value read from the flash memory 202 (S49). On the other hand, the second frequency and the second DUTY ratio of the second pulse signal may be stored in the flash memory 202 in advance. The CPU 201 may acquire the second frequency and the second DUTY ratio from the flash memory 202. The CPU 201 may control the driving unit 217 to output the acquired second pulse signal having the second frequency and the second DUTY ratio from the driving unit 217 to the motor 227.

The first pulse signal determined by the process of S41 and the second pulse signal determined by the process of S49 may be the same. That is, the first frequency and the second frequency may be the same, and the first DUTY and the second DUTY ratio may be the same.

The CPU 201 calculated the diameter of the film roll 22 based on the first total rotation number and the second total rotation number stored in the flash memory 202 (S39, S47). The CPU 201 determines the first pulse signal and the second pulse signal based on the calculated diameter of the film roll 22 and the tension setting value and width setting value stored in the flash memory 202 (S41, S49). The CPU 201 may determine the first pulse signal and the second pulse signal based on any one or any two of the diameter, tension setting value, and width setting value of the film roll 22. .

When the rotation speed of the motor 227 is smaller than the second threshold Th2 (S45: YES) by the processing of S47, the CPU 201 determines the second pulse signal (S49) and rotates the motor 227 in the first direction (S49). S51). The CPU 201 may specify the moving speed of the film 24 in the winding direction using a sensor that can detect the moving speed of the film 24. The CPU 201 may compare the identified moving speed with a predetermined threshold value. The CPU 201 may determine the second pulse signal and rotate the motor 227 in the first direction when the specified moving speed is smaller than a predetermined threshold value.

The CPU 201 controls the drive unit 217 and outputs an initial pulse signal from the drive unit 217 to the motor 227 (S33). After the movement of the guide roller 30 to the lowest position is completed (S29), the CPU 201 may execute the processing from S37 to S37 without performing the processing from S31 to S35. That is, the CPU 201 may rotate the motor 227 in the first direction by outputting the first pulse signal from the beginning without outputting the initial pulse signal from the drive unit 217.

The CPU 201 may determine the initial pulse signal determined by the processing of S31 based on at least one of the diameter, tension setting value, and width setting value of the film roll 22.

The motor 222 of the transport mechanism 50 transmitted the rotational driving force to the pulleys 52A and 53A that support the belts 511 and 512 on the upstream side. The packaging device 1 may further include a pulley that contacts the upstream side of the heating unit 861 among the inner portions of the belts 511 and 512. The motor 222 may transmit the rotational driving force to this pulley.

<Others>
The guide roller 30 is an example of the “guide unit” in the present invention. The CPU 201 that performs the processes of S15 and S27 is an example of the “first moving unit” in the present invention. The CPU 201 that performs the process of S21 is an example of the “first bonding unit” in the present invention. The CPU 201 that performs the process of S29 is an example of the “second moving unit” in the present invention. The motor 227 is an example of the “DC motor” in the present invention. The CPU 201 that performs the process of S43 is an example of the “third moving unit” in the present invention. The CPU 201 that performs the process of S45 is an example of the “first determination unit” in the present invention. The CPU 201 that performs the process of S49 is an example of the “first determination unit” in the present invention. The CPU 201 that performs the process of S51 is an example of the “fourth moving unit” in the present invention. The CPU 201 that performs the process of S61 is an example of the “fifth moving unit” in the present invention. The CPU 201 that performs the process of S73 is an example of the “second bonding unit” in the present invention. The CPU 201 that performs the processing of S47 is an example of the “first acquisition unit” in the present invention. The CPU 201 that performs the process of S37 is an example of the “second acquisition unit” or “third acquisition unit” in the present invention. The CPU 201 that performs the process of S33 is an example of the “initial movement unit” in the present invention. The CPU 201 that performs the process of S35 is an example of the “second determination unit” in the present invention. The CPU 201 that performs the processes of S37 and S39 is an example of the “fourth acquisition unit” in the present invention. The CPU 201 that performs the process of S41 is an example of the “second determining unit” in the present invention.

Claims (10)

1. A packaging device for packaging a pedestal and an article placed on the pedestal with a film,
   A transport mechanism for moving the pedestal on which the article is placed;
   A guide that is movable along a moving path that extends in a vertical direction with respect to a transport path through which the pedestal that is moved by the transport mechanism passes;
   A mounting portion that is provided on the upper side with respect to the transport path and is capable of mounting a film roll on which the film is wound,
   Until the end on the upstream side of the pedestal arranged on the upstream side with respect to the intersection position, which is a position where the conveyance path and the movement path intersect, is arranged on the downstream side of the intersection position. First moving means for relatively moving the pedestal by a transport mechanism;
   First bonding means for bonding a part of the film to the pedestal;
   After the relative movement of the pedestal by the first moving means, the guide unit is moved along the moving path from the upper position to the lower position with respect to the transport path. Transportation means;
   A feeding direction which is a moving direction of the film when the film is fed out from the film roll at the time of relative movement of the pedestal by the first moving means and at the time of movement of the guide portion by the second moving means; A DC motor for moving the film in any direction of the winding direction which is the moving direction of the film when winding the film on a film roll;
   Third moving means for moving the film in the winding direction by outputting a current of a first electric quantity to the DC motor after moving the guide portion by the second moving means;
   First judging means for judging whether or not the moving speed of the film when the film is moved in the winding direction by the third moving means satisfies a first predetermined condition;
   First determining means for determining a second electric quantity;
   When it is determined by the first determination means that the moving speed satisfies the first predetermined condition, the current of the second electric quantity determined by the first determination means is output to the DC motor, thereby Fourth moving means for moving the film in the winding direction;
   When it is determined by the first determination means that the moving speed satisfies the first predetermined condition, the transport mechanism until the upstream end of the pedestal is disposed on the upstream side of the guide portion. A fifth moving means for relatively moving the pedestal by:
   A second bonding means for bonding the other part of the film to the pedestal after relatively moving the pedestal by the fifth moving means;
   A packaging device comprising:
2. The first determining means includes
   2. The packaging device according to claim 1, wherein when the moving speed is determined to satisfy the first predetermined condition by the first determining unit, the second electric quantity is determined.
3. The packaging device according to claim 1 or 2, wherein the first electric quantity is different from the second electric quantity.
4. Comprising a first acquisition means for acquiring the diameter of the film roll;
   The packaging device according to any one of claims 1 to 3, wherein the first determination unit determines the second electric quantity based on the diameter acquired by the first acquisition unit.
5. A second acquisition means for acquiring the width of the film;
   5. The packaging device according to claim 1, wherein the first determination unit determines the second electric quantity based on the width acquired by the second acquisition unit.
6. A third acquisition means for acquiring a set tension of the film;
   The packaging apparatus according to claim 1, wherein the first determination unit determines the second electric quantity based on the set tension acquired by the third acquisition unit.
7. The first determination means includes
   The packaging device according to any one of claims 1 to 6, wherein when the moving speed is smaller than a predetermined threshold, it is determined that the first predetermined condition is satisfied.
8. An initial moving means for moving the film in the winding direction by outputting an electric current of an initial amount of electricity to the DC motor after moving the guiding portion by the second moving means;
   Second determination means for determining whether the acceleration of the film when the film is moved in the winding direction by the initial movement means satisfies a second predetermined condition;
   With
   The third moving means includes
   When the acceleration is determined by the second determination means to satisfy the second predetermined condition, the film is moved in the winding direction by outputting a current of the first electric quantity to the DC motor. The packaging device according to any one of claims 1 to 7, wherein
9. The fifth moving unit starts relative movement of the pedestal by the transport mechanism after the movement of the film in the winding direction of the film by the fourth moving unit is started.
   The said 4th moving means ends the movement to the said winding-up direction of the said film, after the relative movement of the said base by the said 5th moving means is complete | finished. The packaging device described.
10. A fourth acquisition means for acquiring at least one of a diameter of the film roll, a width of the film, and a set tension of the film;
    Second determining means for determining the first electric quantity based on at least one of the diameter, the width, and the set tension acquired by the fourth acquiring means;
    The third moving means moves the film in the winding direction by outputting the current of the first electric quantity determined by the second determining means to the DC motor. The packaging device according to any one of 1 to 9.

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