JP6343786B2 - Bag opening device and packaging machine provided with the same - Google Patents

Description

  The present invention relates to a bag opening device for opening a bag and a packaging machine including the bag opening device.

  2. Description of the Related Art Conventionally, in a bag opening process of a packaging machine, a bag mouth is opened by suction from both sides of a packaging bag and then held by a pair of opening holding spats. Specifically, a pair of suction cups arranged to face both side surfaces of the packaging bag are moved between the most separated position (standby position) and the closest approach position with respect to the packaging bag, and at the closest position. After the adsorbed packaging bag is moved to an intermediate position and stopped in an opened state, a pair of opening holding spats are inserted into the packaging bag and held open.

  However, the conventional bag opening device employs a cam mechanism to reciprocate the suction cup between the most separated position (standby position) and the closest approach position (Japanese Patent Laid-Open No. 11-139413). Regardless of the type (size, material, form, etc. of the bag width), the intermediate position is constant, and in the case of a small bag, the intermediate position may be too close to the standby position and the suction by the suction cup may be removed. The opening lacks stability. Moreover, the opening holding spatula cannot be inserted due to the instability of the opening. Furthermore, when changing the intermediate position according to the size, material, or form of the bag, the cam mechanism must be changed and adjusted, resulting in poor production efficiency and difficult adjustment.

JP-A-11-139413

  Therefore, the object of the present invention is to easily change the intermediate position, which is the opening holding position of the packaging bag, to an appropriate position according to the packaging bag, and to prevent the suction by the suction cup from being removed and the opening holding spatula. It is an object of the present invention to provide a bag opening device and a packaging machine including the bag opening device that can stably fill an object to be packaged while maintaining the opening state more reliably without becoming incapable of being inserted into the packaging bag.

What achieves the above-described problem is that a pair of suction cups arranged to face both side surfaces of a packaging bag filled with an article to be packaged, and a standby position in which the pair of suction cups are separated from the packaging bag, respectively. A position control motor for moving between an intermediate position, which is an opening holding position of the packaging bag, and a closest approach position for adsorbing both side surfaces of the packaging bag, and a control unit for controlling the rotation of the position control motor The control unit controls the amount of rotation of the position control motor so that the pair of suction cups stop at the intermediate position set in advance according to the type of the packaging bag, and at the intermediate position, An opening holding spatula for holding the opening state of the packaging bag opened by the pair of suction cups, and a detecting means for detecting the presence or absence of opening holding by the opening holding spatula,
The control unit controls to move the packaging bag, which is held open by the opening holding spatula, to a packing material filling step based on a signal indicating that the opening is held by the detecting means. Device.

When the control unit recognizes the preset intermediate position shown in the barcode of the packaging bag, the control unit controls the rotation amount of the position control motor to the position set as the intermediate position of the packaging bag. It is preferable to perform control so that the pair of suction cups are moved and then stopped.

In order to achieve the above object, a moving body having grip pairs is intermittently stopped and moved to a plurality of stations, and a package bag supported by the grip pairs is filled with an object to be packaged to open the bag mouth. A packaging machine for sealing, wherein the packaging machine is provided with a bag opening device at a bag opening station for performing a bag opening process for opening a bag, and the bag opening device is a packaging bag for filling an article to be packaged A pair of suction cups arranged to face both side surfaces of the packaging bag, a standby position where the pair of suction cups are spaced apart from the packaging bag, an intermediate position which is an opening holding position of the packaging bag, and both sides of the packaging bag A position control motor that moves between the closest approach positions for adsorbing each and a control unit for controlling the rotation of the position control motor, the control unit in advance according to the type of the packaging bag The pair of pairs at the set intermediate position With board controls the rotation amount of the position control motor to stop, and an opening holding spatula to hold the opening state of the opened packaging bag at the pair of suction cups at the intermediate position, opening the holding Detecting means for detecting whether or not the opening spatula is held by the spatula, and the control unit covers the packaging bag held by the opening holding spatula based on a signal that the opening is held by the detecting means. It is a packaging machine characterized by controlling so that it may transfer to a package filling process .

When the control unit recognizes the preset intermediate position shown in the barcode of the packaging bag, the control unit controls the rotation amount of the position control motor to the position set as the intermediate position of the packaging bag. It is preferable to perform control so that the pair of suction cups are moved and then stopped.

According to the bag opening device of claim 1 or 2 , the intermediate position which is the opening holding position of the packaging bag can be easily changed to an appropriate position according to the type of the packaging bag, and the suction by the suction cup can be performed. It is possible to stably fill the package object while maintaining the opening state more reliably without being detached and the opening holding spatula being unable to be inserted into the packaging bag. In addition, the opening state of the packaging bag can be confirmed, and the opening holding spatula penetrates into the packaging bag and opens to determine that the packaging object can be filled. The certainty of package filling can be further increased.
According to the packaging machine according to claim 3 or 4 , the intermediate position, which is the opening holding position of the packaging bag, can be easily changed to an appropriate position according to the type of the packaging bag, and the suction by the suction cup is released. This prevents the opening holding spatula from being inserted into the packaging bag, and allows the packaged item to be stably filled while maintaining the opening state more reliably. In addition, the opening state of the packaging bag can be confirmed, and the opening holding spatula penetrates into the packaging bag and opens to determine that the packaging object can be filled. The certainty of package filling can be further increased.

It is the plane schematic of one Example of the packaging machine provided with the bag opening apparatus of this invention. It is explanatory drawing for demonstrating operation | movement of the suction cup of the bag opening apparatus in the packaging machine shown in FIG. FIG. 3 is an exploded explanatory view for explaining the suction cup mechanism shown in FIG. 2 by breaking it into an inner (packing machine side) suction cup mechanism and an outer suction cup mechanism. FIG. 3 is a schematic side view of the suction cup mechanism shown in FIG. 2. It is process explanatory drawing for demonstrating the effect | action of the bag opening process and filling process in the packaging machine shown in FIG. It is a time chart for demonstrating the effect | action of each part in the packaging machine shown in FIG. It is a top view for demonstrating the effect | action of the grip pair of the packaging machine shown in FIG. 1, and explaining a stand-by position, an intermediate position, and the closest approach position.

  In the present invention, the pair of suction cups 2a and 2b are used to adsorb the standby position X spaced apart from the packaging bag a, the intermediate position Y that is the opening holding position of the packaging bag a, and both side surfaces of the packaging bag a, respectively. A position control motor 3 that is moved between the closest approach position Z and a control unit that controls the rotation of the position control motor 3, and the control unit sets an intermediate position that is preset according to the type of the packaging bag a. In order to control the rotation amount of the position control motor 3 so that the pair of suction cups 2a, 2b stop at Y, the pair of suction cups 2a, 2b can be stopped at an appropriate intermediate position according to the type of packaging bag, A bag opening device capable of stably filling an object to be packaged while maintaining the opening state more securely without losing the adsorbed state and a packaging machine equipped with the bag opening device have been realized.

A packaging machine equipped with a bag opening device of the present invention will be described with reference to one embodiment shown in FIGS.
The packaging machine P of this embodiment, as shown in FIG. 1, FIG. 2 or FIG. 7, moves the moving body 10 provided with the grip pairs g intermittently to a plurality of stations, and moves to a vertical posture by the grip pairs g. A packaging machine that fills a packaged bag a that is supported and seals the bag mouth, and the packaging machine P opens the bag at a bag opening station 11 that performs a bag opening process for opening the bag. The device 1 is provided, and the bag opening device 1 wraps a pair of suction cups 2a, 2b and a pair of suction cups 2a, 2b, which are respectively arranged to face both side surfaces of the packaging bag a that is filled with an article to be packaged. A position control motor that moves between a standby position X spaced apart from the bag a, an intermediate position Y that is an opening holding position of the packaging bag a, and a closest position Z for adsorbing both side surfaces of the packaging bag a. 3 and control for controlling the rotation of the position control motor 3 And the control unit controls the amount of rotation of the position control motor 3 so that the pair of suction cups 2a and 2b stops at an intermediate position Y set in advance according to the type of the packaging bag a. It is a packaging machine. Hereinafter, each configuration will be described in detail.

  The packaging machine P is a device that opens the bag mouth of the packaging bag a, fills and seals the object to be packaged, and supplies the packaging bag a to the packaging machine at each station as shown in FIG. Bag opening process (1), chuck opening and printing of the zippered packaging bag and printing (2), printing inspection and bar code authentication printing inspection and bar code authentication process (3), packaging A bag opening step (4) for opening the bag mouth of the bag, a filling step (5) for filling the packaging bag into the packaging bag, a vibrating step (6) and (7) for applying vibration to the packaged item, and the packaged item Pushing / blowing step (8), sealing the vicinity of the bag mouth in the horizontal direction, and releasing the air in the packaging bag, the top seal / air bleeding step (9), the top seal is cooled, and the package Remove the wrapped packaging bag a from the machine. A seal cooling and products apparatus for performing 10 step of the discharge step (10).

  Although this embodiment is a rotary type packaging machine P, the present invention can be applied to a known linear movement type packaging machine.

  In this packaging machine P, as shown in FIG. 1, a stand is provided on the machine base for freely supporting the intermittent rotating shaft 12 extending in the vertical direction, and a moving body attached to the upper portion of the intermittent rotating shaft 12. The (disk-shaped rotating body) 10 is provided with ten grip pairs g for gripping or releasing the packaging bag a so as to protrude radially at equal angular intervals around the intermittent rotating shaft 12. . In the packaging machine P, the packaging bag a is taken out of the packaging bag a by the bag feeding device 13 in the bag feeding process (1), and the packaging bag a is perpendicular to the grip pair g that is intermittently moved to the bag feeding station. It is comprised so that it may be supported by hanging form.

  As shown in FIG. 1, a bag opening device 1 is provided in the bag opening station 11 for performing the bag opening step (4), and the bag opening device 1 is filled with an object to be packaged as shown in FIG. It has a pair of suction cups 2a and 2b arranged to face both side surfaces of the packaging bag a. The pair of suction cups 2a and 2b communicate with a suction device (not shown) as a vacuum source, and suck the packaging bag a from both side surfaces to open the bag mouth of the packaging bag a.

  Specifically, as shown in FIG. 7, the pair of suction cups 2a and 2b includes a standby position X that is spaced from the packaging bag a, an intermediate position Y that is an opening holding position of the packaging bag a, and a packaging bag. It is comprised so that it may move between the closest approach positions Z for adsorbing both side surfaces of a. FIG. 7A shows a case of a large packaging bag. In this case, since the bag mouth of the packaging bag a can be opened greatly, the intermediate position Y is accordingly set to the position on the standby position X side. It is set in advance. On the other hand, FIG. 7B shows a case of a small packaging bag. In this case, since the bag mouth of the packaging bag a needs to be opened relatively small, the intermediate position Y is closer to the closest approach position Z side. The position is preset. In addition, as shown in FIG. 7, the grip pair g moves toward the inner side (packaging bag side) with the suction by the pair of suction cups 2a and 2b at the opening of the bag mouth, thereby narrowing the interval of the packaging bag a. It is configured to assist the opening.

  A suction cup mechanism (suction cup reciprocating mechanism) 4 for freely moving the pair of suction cups 2a and 2b between the standby position X, the intermediate position Y, and the closest approach position Z is shown in FIG. A connecting rod 6 connected to the rotating shaft 5 of the position control motor 3, a link mechanism 7 connected to one end of the connecting rod 6, and a pair of suction cups 2a and 2b attached to the link mechanism 7. Has been. As the position control motor, a servo motor, a stepping motor, a brushless motor, or the like can be suitably used. In this embodiment, a servo motor is used.

  Specifically, when the inner suction cup 2a is moved, as shown in FIG. 3, when the rotation shaft 5 of the position control motor 3 is rotated (rotational motion within 360 ° or reciprocal motion within 180 °). The other end 6a of the connecting rod 6 moves substantially in the left-right direction in FIG.

  That is, when the other end 6a of the connecting rod 6 is positioned on the rightmost side in FIG. 3, the drive lever 4a whose upper end is connected to the other end 6a of the connecting rod 6 is centered on the rotation fulcrum 4b shown in FIG. The lower end of the drive lever 4a moves to the leftmost side (packaging machine side) in FIG. 3, and the suction cup 2a is positioned at the standby position X along with this.

  On the other hand, when the other end 6a of the connecting rod 6 is located on the leftmost side in FIG. 3, the drive lever 4a whose upper end is connected to the other end 6a of the connecting rod 6 is centered on the rotation fulcrum 4b shown in FIG. The lower end of the drive lever 4a moves to the rightmost side in FIG. 3, and the suction cup 2a is positioned at the closest position Z accordingly.

  Further, when the other end 6a of the connecting rod 6 is positioned in the middle, the drive lever 4a whose upper end is connected to the other end 6a of the connecting rod 6 rotates around the rotation fulcrum 4b shown in FIG. The lower end of the drive lever 4a moves to the intermediate position, and the suction cup 2a can be positioned at the intermediate position Y accordingly.

  The outer suction cup 2b is also configured to be interlocked with the operation of the connecting rod 6 via a driven lever 4c and a driven side connecting link 4d that are rotatably attached to the rotation fulcrum 4b. In FIGS. 3 and 4, 4e and 4f are fixing plates, and 4g is a connection holder for connecting the suction cups 2a and 2b and the link mechanism 7, respectively.

  When the other end 6a of the connecting rod 6 is located on the rightmost side in FIG. 3, the driven lever 4c rotates about the rotation fulcrum 4b shown in FIG. 4, and the lower end of the driven lever 4c is the most in FIG. The suction cup 2b is configured to move to the right side, and accordingly, the suction cup 2b is positioned at the standby position X.

  On the other hand, when the other end 6a of the connecting rod 6 is located on the leftmost side in FIG. 3, the driven lever 4c rotates about the rotation fulcrum 4b shown in FIG. 4, and the lower end of the driven lever 4c is the most in FIG. It moves to the left side (packing machine side), and it is comprised so that the suction cup 2b may be located in the closest approach position Z with this.

  Further, when the other end 6a of the connecting rod 6 is located in the middle, the driven lever 4c rotates around the rotation fulcrum 4b shown in FIG. 4, and the lower end of the driven lever 4c moves to the middle. Accordingly, the suction cup 2b can be positioned at the intermediate position Y.

  And a control part controls the rotation amount of the position control motor 3 by the said suction cup mechanism 4 so that a pair of suction cups 2a and 2b stop in the intermediate position Y preset according to the kind of packaging bag a. It is configured to be able to. Accordingly, the pair of suction cups 2a and 2b can be stopped at an appropriate intermediate position according to the type of the packaging bag, and the package can be stably filled while maintaining the open state more reliably.

  Specifically, the control unit recognizes a preset intermediate position Y indicated in the barcode of the packaging bag a in the print inspection / barcode authentication step (3), and in the bag opening step (4). Then, the rotation amount of the position control motor 3 is controlled to move the pair of suction cups 2a, 2b to the position set as the intermediate position Y of the packaging bag, and then stop.

  In this embodiment, the control unit is configured to recognize the intermediate position Y set in advance according to the type of the packaging bag a from the barcode information in the print inspection / barcode authentication step (3). However, the method in which the control unit recognizes the intermediate position Y set in advance according to the type of the packaging bag a may be based on other methods. For example, item registration is performed in advance in the control unit for each type of packaging bag. The controller may recognize the intermediate position Y by designating an item (specific packaging bag) via the input device.

  Further, as shown in FIG. 2, the packaging machine P has a pair of openable spatula 8a that can be opened and closed for maintaining the opened state of the packaging bag a opened by the pair of suction cups 2a and 2b at the intermediate position Y. , 8b and a detecting means 9 for detecting the presence or absence of opening holding by the pair of opening holding spats 8a, 8b, and the control section fills the package based on a signal that the detecting means 9 has opening holding. It is comprised so that it may transfer to. As a result, the opening state of the packaging bag can be confirmed, and the determination is made that the opening holding spatula 8a, 8b enters the packaging bag a and opens and can be filled with the packaging object a. Therefore, the certainty of filling the package can be further increased.

  As shown in FIG. 2, the pair of opening holding spats 8a and 8b are attached to an elevating mechanism 14 (driving means not shown) for entering the packaging bag a, and are configured to be movable up and down. Yes. Further, the pair of opening holding spats 8a and 8b enter the packaging bag a in a closed state (the state shown in FIG. 5B), and then open to hold the opening state of the packaging bag a ( 5 (c), the opening / closing mechanism 15 is attached to an opening / closing mechanism 15a that can be moved up and down by a driving means (not shown). Along with the vertical movement, there is an opening / closing part 15c that opens and closes the opening holding spats 8a and 8 about the rotation fulcrum 15b, and an elastic member 15d that biases the upper ends of the opening / closing part 15c, and the lifting part 15a A pair of opening holding spats 8a and 8b are configured to be openable and closable with the up and down movement.

Next, characteristic actions in the bag opening process (4) and the filling process (5) of the packaging machine P of the present invention will be described with reference to FIG. 5 or FIG.
When the packaging bag a held in the posture perpendicular to the grip pair g intermittently moves to the bag opening station 11 where the bag opening step (4) is performed, as shown in FIG. The suction cups 2 a and 2 b are moved from the standby position X to the closest position Z by the rotation control of the control motor 3. In FIG. 6, the suction cups 2a and 2b move to the closest approach position Z at t1. Thereafter, the solenoid valve (SV) is turned on and suction is started. In this state, the grip pair g is maintained in the tension state, and the opening auxiliary air blowing portion 16 is in an ON state slightly before t1 so that air can be blown from the bag mouth.

  Next, as shown in FIG.5 (b), the control part attracted | sucked the both sides | surfaces of the packaging bag a with the suction cups 2a and 2b from t2 in FIG. 6 (electromagnetic valve (SV) ON state), respectively. Thus, the pair of suction cups 2a and 2b are moved toward the intermediate position Y set in advance according to the type (bag width or the like) of the packaging bag a. Then, the pair of suction cups 2a and 2b are stopped at the intermediate position Y by controlling the rotation amount of the position control motor 3, respectively. While the pair of suction cups 2a and 2b are moved to the intermediate position Y, the grip pair g is in a loose state and follows the opening of the bag mouth so that the gap between the grip pair g can be contracted. Further, air is blown from the bag opening by the opening auxiliary air blowing portion 16 to assist opening, and the opening holding spats 8a and 8b descend and enter from the bag opening. An intermediate position Y between the pair of suction cups 2a and 2b is a position at time t3 in FIG. 6, and generally a larger bag is positioned on the standby position X side, and a smaller bag is positioned on the closest approach position Z side (FIG. 7). reference).

  Further, as shown in FIG. 5C, the suction cups 2a and 2b return to the standby position X by the rotation of the position control motor 3, respectively, and air is blown from the bag mouth by the opening auxiliary air blowing portion 16 to assist opening. On the other hand, the pair of opening holding spats 8a and 8b are in an open state (the state shown in FIG. 5C) in order to maintain the opening state of the packaging bag a.

  When the detection means 9 detects the above state (opening holding state by the pair of opening holding spats 8a, 8b), the control unit controls to shift to the filling step (5). Specifically, the packing bag is intermittently moved to the filling station where the filling process is performed while the opening state of the packaging bag a is held by the pair of opening holding spats 8a and 8b, as shown in FIG. 5 (d). It is located below the insertion jaw 17.

  After that, as shown in FIG. 5 (e), the filling material insertion jaw 17 descends and enters from the bag mouth, and the pair of opening holding spats 8a and 8b rise to hold the packaging bag a in the open state. It is configured to be released and filled in the packaging bag a through the filling material insertion jaw 17.

  As described above, in the packaging machine P of the present invention, the rotation amount of the position control motor 3 so that the pair of suction cups 2a and 2b stops at the intermediate position Y set in advance by the control unit according to the type of the packaging bag a. Therefore, the pair of suction cups 2a and 2b can be stopped at an appropriate intermediate position according to the type of the packaging bag, and the package can be stably filled by holding the opening state more reliably. it can. Further, the packaging machine P includes a pair of open / close opening spats 8a and 8b for holding the open state of the packaging bag a opened by the pair of suction cups 2a and 2b at the intermediate position Y, and a pair of openings. It has detection means 9 which detects the presence or absence of opening holding by holding spatula 8a, 8b, and a control part seems to control to shift to a to-be-packaged filling process based on a signal with opening holding by detection means 9 Therefore, the opening state of the packaging bag can be confirmed, and it is determined that the opening holding spatula 8a, 8b can enter the packaging bag a and open to be filled with the article to be packaged a. Since the object to be packaged is filled, the certainty of the object to be packaged can be further increased.

P Packaging machine 1 Bag opening device 2a, 2b Suction cup 3 Position control motor 4 Suction cup mechanism 5 Rotating shaft 6 Connecting rod 7 Link mechanism 8a, 8b Opening holding spatula 9 Detection means 10 Moving body
DESCRIPTION OF SYMBOLS 11 Bag opening station 12 Intermittent rotating shaft 13 Bag supply apparatus 14 Lifting mechanism 15 Opening / closing mechanism 16 Opening auxiliary air blowing part 17 Filling insertion jaw a Packaging bag g Grip pair

Claims (4)

A pair of suction cups arranged opposite to both side surfaces of the packaging bag for filling the packaged items,
Position control for moving the pair of suction cups between a standby position spaced from the packaging bag, an intermediate position that is an opening holding position of the packaging bag, and a closest position for adsorbing both side surfaces of the packaging bag. A motor,
A control unit for controlling the rotation of the position control motor;
The control unit controls the rotation amount of the position control motor so that the pair of suction cups stops at the intermediate position set in advance according to the type of the packaging bag ,
An opening holding spatula for holding the opening state of the packaging bag opened by the pair of suction cups at the intermediate position;
Detecting means for detecting presence or absence of opening holding by the opening holding spatula,
The control unit controls to move the packaging bag, which is held open by the opening holding spatula, to a packing material filling step based on a signal indicating that the opening is held by the detecting means. apparatus. When the control unit recognizes the preset intermediate position shown in the barcode of the packaging bag, the control unit controls the rotation amount of the position control motor to the position set as the intermediate position of the packaging bag. The bag opening device according to claim 1, wherein the bag opening device is controlled to stop after each of the pair of suction cups is moved. A moving machine provided with grip pairs is intermittently stopped and moved to a plurality of stations, and is a packaging machine for filling a package bag supported by the grip pairs and sealing a bag mouth.
The packaging machine is provided with a bag opening device at a bag opening station that performs a bag opening process for opening a bag,
The bag opening device includes a pair of suction cups arranged to face both side surfaces of a packaging bag filled with an article,
Position control for moving the pair of suction cups between a standby position spaced from the packaging bag, an intermediate position that is an opening holding position of the packaging bag, and a closest position for adsorbing both side surfaces of the packaging bag. A motor,
A control unit for controlling the rotation of the position control motor;
The control unit controls the rotation amount of the position control motor so that the pair of suction cups stops at the intermediate position set in advance according to the type of the packaging bag ,
An opening holding spatula for holding the opening state of the packaging bag opened by the pair of suction cups at the intermediate position;
Detecting means for detecting presence or absence of opening holding by the opening holding spatula,
The control unit controls to move the packaging bag, which is held open by the opening holding spatula, to a packing material filling step based on a signal indicating that the opening is held by the detecting means. . When the control unit recognizes the preset intermediate position shown in the barcode of the packaging bag, the control unit controls the rotation amount of the position control motor to the position set as the intermediate position of the packaging bag. The packaging machine according to claim 3, wherein the packaging machine is controlled to stop after each of the pair of suction cups is moved .

Images