JP2014005048A - Shaping device of bag mouth opening shape in packaging machine for bagging - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag mouth opening device capable of forming an opening shape of a bag mouth into a prescribed shape even when a change occurs to an interval of a gripper in a proximity position caused by wearout of a component and the like.SOLUTION: When a bag moves to an object to be packaged filling station, an elevating shaft 43 of a shaping device 41 of a bag mouth opening shape is lowered, correction members (engaging rollers) 50L, R installed at arm parts 48L, R are position inside the arms 9L, R of a gripper respectively, and the lower side of shaping guides 51L, R enter the bag mouth. When air cylinders 45L, R are actuated, arms go away from each other, the correction members move the gripper to the middle position by making them far apart from each other, and the shaping guides come into contact with the inner side of the edge parts on both sides of the bag and shape the shape of the portion.

Description

  The invention of the present application forms a bag mouth opening shape for use in a bagging and packaging machine that holds and holds both side edges of a bag with a pair of grippers and sequentially performs a predetermined packaging process while transferring the bag along a predetermined track. Relates to the device.

  A common bag filling and packaging machine (hereinafter simply referred to as “packing machine”) uses a pair of left and right grippers that sandwich and hold both side edges of the bag. , Japanese Patent No. 2917074, and Japanese Patent Application Laid-Open No. Hei 8-156918. After filling the package, the bag mouth is tensioned and closed apart from each other prior to sealing the bag mouth. Further, although the gripper contacting / separating mechanism disclosed in each of the above publications is different in each detail, the basic configuration, that is, a direction in which a pair of left and right grippers are pivotally supported, and approach each other with a spring. , And the point of contact is separated by the action of the cam (the cam roller is pressed against the cam surface by the action of the spring).

By the way, in recent years, from the viewpoint of the appearance of the packaged goods and the cost reduction of the packaging materials, tight packaging (the bag size is not much more than the size of the packaged goods, and the package is tightly packed in the bag). Packing is filled)) is increasing. In such a case, there is almost no margin between the opening size of the bag mouth when filling the packaged item and the cross-sectional dimension of the packaged item to be filled. It is necessary to form well and prevent the packaged item from being caught in the bag mouth and causing poor filling.

Further, in order to always form the opening shape of the bag mouth in a predetermined shape, it is extremely important that the intervals at the approach positions are always kept constant for all the grippers provided in a plurality of sets. However, as the packaging machine is used, the cam roller that rolls on the cam surface and the bearing that rotatably supports the gripper wear, so the gripper's approaching position changes beyond the allowable range, resulting in poor filling. It is inevitable that this will occur.

  In addition, since the wear as described above does not always occur to the same extent for all grippers, it is impossible to predict at what time the approach position of the gripper changes beyond the allowable range. Therefore, when such a filling failure occurs, the operator or service person checks the approach position of the applicable gripper, and responds by replacing parts, adjusting, etc. if necessary. The work is extremely complicated, requires skill, and has a problem of significantly reducing productivity.

Japanese Utility Model Publication No. 5-28169 Japanese Patent No. 2917074 JP-A-8-156918

The present invention has been made in view of the above-mentioned problems of the prior art, and even when the gap between the grippers at the approach position changes due to wear of parts or the like, the opening shape of the bag mouth can always be formed into a predetermined shape, It is an object of the present invention to provide a bag mouth opening shape shaping device capable of repairing the approaching positions of all grippers at a predetermined interval at a time easily and quickly as compared with the prior art.

In order to solve the above problems, the present invention provides a bag mouth opening shape shaping device having the following configuration. That is, the present invention is a bag mouth opening shape shaping device in a bag filling and packaging machine that sequentially performs a predetermined packaging process while transferring a bag along a predetermined trajectory. The structure includes a moving member that moves along a predetermined track, a plurality of sets that are attached to the moving member at equal intervals, and that releasably hold both side edges of the bag. A pair of left and right grippers each having an arm portion provided for the above are provided. At least one arm portion of the gripper is supported by the moving member on the other end side, and the sandwiching member is configured to come in contact with and separate from the other sandwiching member. The bag mouth opening shape shaping device further acts on at least one of the grippers, and biases the pair of grippers between the gripping members toward each other, and the biasing member, An approach / separation mechanism that acts on at least one of the grippers, and makes the gripper contact / separate between a predetermined separation position where the clamping members are relatively separated from each other and a predetermined approach position where the gripping members are relatively close to each other; A correction member that acts on an arm portion of at least one of the grippers located at the approach position and moves the gripper to an intermediate position set between the approach position and the separation position;
Both of the pair of left and right grippers are axially supported so that their arm portions can rotate with respect to the moving member at the other end side, and the biasing member acts on both of the pair of left and right grippers. The separation mechanism can act on both the left and right grippers, and can be configured to simultaneously contact and separate between the separation position and the approach position.
The straightening member is connected to a driving source and moves in the length direction of the bag and the width direction of the bag, and a roller rotatably attached to one end side of the arm portion and abutting on the arm portion of the gripper It can be set as the structure provided with these.
The straightening member may be a pair of straightening members that act on each arm portion of the pair of left and right grippers.
The pair of correction members are connected to a driving source and simultaneously move in the length direction of the bag, and rotate toward one end of each of the pair of arm portions. It can be freely configured and can be constituted by a roller that comes into contact with a corresponding gripper arm portion.
The bag mouth opening shape shaping device further includes shaping guides respectively provided on the pair of arm portions of the correction member, and when the pair of arm portions move in the length direction of the bag toward the bag, The shaping guide enters into the opened bag mouth, and when the pair of arm portions are separated from each other in the width direction of the bag, the shaping guide contacts the inner surface of the bag mouth to shape the opening shape of the bag mouth into a predetermined shape. Can do.
More specifically, the moving member is a rotary table that is connected to a drive source and intermittently rotates in a horizontal plane, and the grippers are provided around the rotary table to hold the bags in a suspended manner. The correction member is provided in a package filling station which is a predetermined intermittent stop position.

As described above, in the present invention, before filling the package, in order to correct the pair of left and right grippers to a predetermined interval by the correction member, for example, the cam roller of the contact / separation mechanism for contacting and separating the gripper or the gripper is axially supported. Even if the bearing portion or the like is worn, or even if the wear is different for each gripper, the opening shape of the bag mouth can always be formed in a constant shape.
Furthermore, even if the corrective member wears, the intermediate position of the gripper changes beyond the allowable range, and a filling failure occurs, all the grippers need to be replaced at the time of filling the package by simply replacing the corrective member. Since the shape can be maintained constant, the repair work can be performed easily and quickly as compared with the conventional case.
Further, by providing a pair of shaping guides, the opening shape of the bag mouth can be shaped into a more stable shape and maintained.

It is a fragmentary perspective view which shows the general | schematic structure of the bagging and packaging machine using the bag mouth opening shape shaping apparatus which concerns on embodiment of this invention. It is a partial notch perspective view which shows the gripper contact / separation mechanism. It is a perspective view which shows a bag mouth opening shape shaping apparatus. It is explanatory drawing which showed the process of shaping a bag mouth shape with the top view.

A bag mouth opening shape shaping device (hereinafter referred to as “opening shaping device”) according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partial perspective view showing a schematic configuration of a bag filling and packaging machine 1 (hereinafter simply referred to as “packaging machine”) using an opening shaping device 41 according to an embodiment of the present invention. The packaging machine 1 is an intermittent rotation type rotary packaging machine, and includes a rotary table 5 attached to the machine base 3 and intermittently rotated by a drive source (not shown). The rotary table 5 is provided with a plurality of pairs of left and right grippers 7L and 7R that hold both side edges of the bag B and hold the bag B in a vertical state. The rotary table 5 rotates intermittently. Accordingly, it moves intermittently along the circular orbit. The movement trajectory is not limited to a circular trajectory, and may be a straight line or a racetrack. The bag transfer is not limited to intermittent transfer, and includes a case of continuous transfer. The holding of the bag is not limited to the vertical type (holding the bag in a suspended state), but may be a horizontal type (holding the bag in a horizontal state).

The bag B is supplied and gripped toward the grippers 7L and 7R at the bag supply station I (not shown), transferred to the bag opening station IV via the printing station II and the printing inspection station III (both not shown), Here, the bag mouth is opened, and details thereof will be described later. In the next filling station V, the object to be packaged is filled. In this station V, the bag mouth is shaped prior to the filling of the object to be packaged C. This will also be described later. Thereafter, bag bottom vibration station VI (vibration device not shown), bag mouth biting inspection station VII (inspection device not shown), press deaeration and bag mouth sealing station VIII (press deaeration device and Various processes are performed at a cooling and defective product discharge station IX and a product bag discharge station X (both not shown).

Next, the opening of the bag mouth will be described with reference to FIG. As is well known, the opening of the bag mouth is made to adsorb a pair of suction cups (not shown) located on both sides of the bag surface on both sides of the bag mouth of the bag B and move them away from each other and grippers 7L, Perform 7R close to each other. FIG. 2 is a perspective view showing a mechanism for moving the grippers 7L and 7R toward and away from each other. That is, the bag B is sandwiched between the edges by the grippers 7L and 7R, held in a suspended state, and moved to the opening station IV.

  The grippers 7L and 7R are respectively provided with arm portions 9L and 9R, and the arm portions 9L and 9R are each provided with an openable and closable holding member 10L and 10R for holding the bag B on one end side, and an attachment pin on the other end side 8L and 8R are rotatably attached to the lower surface side of the turntable 5. The extension portions 9La and 9Ra of the arm portions 9L and 9R extending toward each other have an engagement pin 11 attached through the extension portion 9La and an elongated engagement groove into which the lower end side of the engagement pin 11 is fitted. 12, the arm portions 9L and 9R are interlocked and rotated in the opposite directions by these engagements.

  Reference numeral 13 denotes an all-around cam (hereinafter referred to as “cam”) provided along the circumferential direction below the rotary table 5, and a high-order part 13 a having a high height from a lower end thereof and a low-order part 13 b having a short length. And an inclined portion 13c between them. Reference numeral 14 is a bifurcated bracket, which is attached to the lower surface of the turntable 5 at its flat crotch portion and extends downward. An L-shaped lever 15 is attached to the lower end portion of the mounting cylinder portion 15a so as to be rotatable in a vertical plane by a mounting pin 16a. A roller 16 is attached to the upper end of the vertical portion 15b of the L-shaped lever 15, and can come into contact with the second extension portion 9Lb of one arm portion 9L as shown in the figure. A cam roller 17 that rolls on the cam 13 is rotatably attached to the tip of the horizontal portion 15c.

Further, spring mounting pins 18L and 18R are respectively attached to the upper surfaces of the arm portions 9L and 9R, and a tension spring 19 as an urging member is attached thereto. Accordingly, an urging force in a direction in which the holding members 10L and 10R are brought close to each other always acts on the arm portions 9L and 9R, and the urging force is transmitted to the roller 16 from the second extension portion 9Lb of one arm portion 9L. The L-shaped lever 15 is urged counterclockwise in FIG. 2 so that the cam roller 17 abuts on the cam 13. As a result, when the cam roller 17 is on the high position portion 13a of the cam 13, the two holding members 10L and 10R are in the separated positions as shown in the figure, and the bag mouth of the bag B is tensioned. Although it is closed, if it moves toward the low-order part 13b through the inclination part 13c, the clamping members 10L and 10R will mutually approach. At that time, although not shown in the drawing, a pair of known suction cups are adsorbed on both sides of the bag mouth and then moved away from each other, whereby the bag mouth of the bag B is opened. The rolling of the cam roller 17 on the cam 13 is performed as follows. That is, when the bag B is moved to the bag opening station IV in FIG. 1, the cam roller 17 is on the high position portion 13 a of the cam 13, and the cam 13 rotates integrally with the rotary table 5 by one pitch. Then stop. Thereafter, the all-around cam 13 rotates one pitch to the opposite side. At that time, the cam roller 17 moves from the high level portion 13a to the inclined portion 13c and moves toward the low level portion 13b. Along with this, the grippers 7L and 7R are rotated in opposite directions by the force of the spring 19, and the clamping members 10L and 10R come close to each other.

  In this embodiment, an adjusting mechanism 21 that adjusts the approach position that is finally located when the holding members 10L and 10R approach is provided. That is, in this embodiment, the star cam 22 having the number of uneven portions equal to the number of gripper pairs attached to the turntable 5 is disposed concentrically with the turntable 5 and intermittently rotates together with the turntable 5. It is like that. Then, just before the cam roller 17 moves on the inclined portion 13 c and reaches the lower portion 13 b, the outer peripheral surface of the roller 11 a attached to the upper portion of the engaging pin 11 contacts the inclined side 23 of the star cam 22. The approach of the grippers 7L and 7R stops, and the holding members 10L and 10R are located at the approach positions. The approach position can be adjusted by adjusting the position of the star cam 22 in the rotational direction. The adjustment mechanism 21 will be described below.

  The adjustment mechanism 21 includes a threaded shaft 25 that is screwed into a shaft support portion 24 having a female screw attached to the upper surface of the rotary table 5, and is rotated by using a knob 26 provided at the upper end thereof. The threaded shaft 25 moves up and down. The threaded shaft 25 extends through the turntable 5, and its lower end engages with a swing lever 27 that can rotate in a vertical plane around a fulcrum (not shown). A swing shaft 28 attached to the swing lever 27 on the side opposite to the threaded shaft 25 extends upward through a long hole 30 formed in the rotary table 5, and a roller 29 attached to the upper end thereof is a star. A long hole 31 formed in the shape cam 22 is fitted. Accordingly, by rotating the threaded shaft 25 using the knob 26 and moving it up and down as desired, the rocking shaft 28 tilts, and the star cam 22 is rotated clockwise or counterclockwise to form a star shape. The position of the cam 22 in the rotational direction can be adjusted. The adjustment mechanism 21 can adjust the approach positions of all the plurality of gripper pairs provided. The adjusting mechanism 21 is disclosed in detail in Japanese Utility Model Publication No. 5-28169, and does not directly constitute the present invention, and therefore, detailed description thereof is omitted.

  In this way, the bag filling station V to which the bag B having the bag mouth opened is moved next is provided with a bag mouth opening shape shaping device 41 together with a package filling device (not shown). This will be described below.

Reference numeral 42 is a stand erected on the upper surface of the machine base 3, and supports the elevating shaft 43 so as to be movable up and down. An air cylinder mounting bracket (hereinafter referred to as “bracket”) 44 is attached to the upper end side of the elevating shaft 43 at an attachment portion 44a. A vertical portion 44b and a horizontal portion 44c extend downward from the attachment portion 44a, and air cylinders 45L and 45R are attached to the upper surface side and the lower surface side of the horizontal portion 44c as shown in the figure. The rods 46L and 46R of the air cylinders 45L and 45R extend in directions opposite to each other in a direction substantially perpendicular to the longitudinal direction of the horizontal portion 44c of the bracket 44. Further, arm mounting blocks (hereinafter referred to as “blocks”) 47L and 47R are respectively attached to the tips, and further, the arm portions 48L extending in parallel with each other toward the turntable 5 as shown in the drawings. 48R is mounted using mounting screws 49L and 49R, respectively. Engagement rollers 50L and 50R as correction members are rotatably attached to the lower surface side of the distal end portions of the arm portions 48L and 48R. Further, the shaping guides 51L and 51R are attached to the arm portions 48L and 48R on the side surfaces facing each other at a position slightly closer to the engaging rollers 50L and 50R than their substantially intermediate positions. The shaping guides 51L and 51R are formed by bending a square flat plate into a mountain shape, and the folding lines extend in the vertical direction, and are attached in a state where the recessed inner surfaces face each other. As can be seen from the above description, the arm portions 48L and 48R can be moved up and down, and can be brought into contact with and separated from each other in a parallel state. In the standby state, the elevating shaft 43 is at the ascending end, and the arm portions 48L and 48R are also at the ascending position. When the elevating shaft 43 moves to the lower end, the arms 48L, 48R are also lowered, and the engaging rollers 50L, 50R are at the same position in the height direction as the arm portions 9L, 9R of the grippers 7L, 7R, and the arm portion 9L. 9R, the lower portions of the shaping guides 51L and 51R enter the bag opening of the bag B.

4A and 4B are explanatory views showing the process of shaping the opening shape in a plan view. FIG. 4A is a state when the lifting shaft 43 is lowered to the lower end, and FIG. 4B is a rod 46L of the air cylinders 45L and 45R, The state when 46R is extended is shown.

In FIG. 4 (A), the bag mouth of the bag B remains opened at the bag mouth opening station IV, that is, the grippers 7L and 7R are located at the approach positions. The engaging rollers 50L and 50R and the shaping guides 51L and 51R attached to the arm portions 48L and 48R of the bag mouth opening shape shaping device 41 are positioned as shown in the figure. That is, the engaging rollers 50L and 50R are separated from the arm portions 9L and 9R of the grippers 7L and 7R, and the shaping guides 51L and 51R are in the bag mouth but are not in contact with each other. When the air cylinders 45L and 45R are operated from this state and the rods 46L and 46R are extended, the arm portions 48L and 48R move in a direction away from each other while being in a parallel state, and the engaging rollers 50L and 50R are grippers. The arm portions 9L and 9R of the 7L and 7R are brought into contact with each other and rotated in opposite directions, whereby the holding members 10L and 10R are moved to predetermined intermediate positions between the separation position and the approach position, respectively. At this time, the shaping guides 51L and 51R are in contact with the inner surface of the bag mouth at both side edges of the bag B, thereby making the shape of both side edges of the bag B follow the shape of the shaping guides 51L and 51R. The part between the parts is shaped into a substantially straight line. While maintaining this state, the packaging material is filled by the above-described packaging material filling apparatus, and the elevating shaft 43 is raised after the filling is completed. When the engaging rollers 50L and 50R are disengaged from the arm portions 9L and 9R of the grippers 7L and 7R, the grippers 7L and 7R are returned to the approach position by the action of the spring 19. Further, the rods 46L and 46R of the air cylinders 45L and 45R contract and return to the direction in which the arm portions 48L and 48R approach each other, and the engagement rollers 50L and 50R and the shaping guides 51L and 51R return to the standby position.

  In the above example, the pair of correction members and the pair of shaping guides are moved up and down by a common drive source (a lift shaft that moves up and down by a mechanical cam (not shown)), and are brought into and out of contact by a common drive source (air cylinder). However, the pair of correction members and the pair of shaping guides may be moved up and down, and contacted and separated by different driving sources. In carrying out the present invention, in addition to a general method using a hopper, filling of an object to be packaged is performed by holding the object to be packaged with an openable / closable holding member and inserting the holding member into the bag. A method may be used in which the member is released and extracted from the bag, and the article to be packaged is left in the bag.

  Further, in carrying out the present invention, it is not essential to provide a star-shaped cam that determines the approach position of the gripper at the bag mouth opening station so that the position can be adjusted. A stopper instead of a star cam may be attached to the rotary table so as to correspond to each gripper so that the position thereof can be adjusted, and further, instead of adjusting the position of the stopper, a roller engaging with the stopper can be adjusted. The diameter may be changed. Furthermore, when adjustment of the approach position is unnecessary, both the separation position and the approach position may be defined by the high-order part and the low-order part of the all-around cam.

Claims (7)

In the bag mouth opening shape shaping device in the bag filling and packaging machine that sequentially performs a predetermined packaging process while transferring the bag along a predetermined trajectory,
A moving member that moves along the predetermined trajectory;
A pair of left and right grippers each having a pair of gripping members attached to the moving member at equal intervals and holding both side edges of the bag so as to be releasable, and an arm portion having the gripping member on one end side, One arm portion is supported by the moving member on the other end side, and a gripper configured so that the holding member is in contact with and away from the other holding member;
A biasing member that acts on at least one of the grippers to bias the gripping members of the pair of grippers toward each other;
It acts on at least one of the grippers against the biasing member, and the gripper is positioned between a predetermined separation position where the clamping members are relatively separated from each other and a predetermined approach position where the gripping members are relatively close to each other. A contact / separation mechanism to contact / separate with,
A correction member that acts on an arm portion of at least one of the grippers located at the approach position and moves the gripper to an intermediate position set between the approach position and the separation position; A bag mouth opening shape shaping device.   Both of the pair of left and right grippers are axially supported so that their arm portions can rotate with respect to the moving member at the other end side, and the biasing member acts on both of the pair of left and right grippers. The bag mouth opening shape shaping device according to claim 1, wherein the separation mechanism acts on both the left and right grippers, and causes each of them to contact and separate at the same time between the separation position and the approach position.   The straightening member is connected to a driving source and moves in the length direction of the bag and the width direction of the bag, and a roller rotatably attached to one end side of the arm portion and abutting on the arm portion of the gripper The bag mouth opening shape shaping device according to claim 1 or 2, characterized by comprising:   The bag mouth opening shape shaping device according to claim 2, wherein the straightening member comprises a pair of straightening members that act on each arm portion of the pair of left and right grippers.   The pair of correction members are connected to a driving source and simultaneously move in the length direction of the bag, and rotate toward one end of each of the pair of arm portions. The bag mouth opening shape shaping device according to claim 4, further comprising a roller that is freely attached and abuts against a corresponding arm portion of the gripper.   The bag mouth opening shape shaping device further includes shaping guides respectively provided on the pair of arm portions of the correction member, and when the pair of arm portions move in the length direction of the bag toward the bag, The shaping guide enters into the opened bag mouth, and when the pair of arm portions are separated from each other in the width direction of the bag, the shaping guide contacts the inner surface of the bag mouth to shape the opening shape of the bag mouth into a predetermined shape. The bag mouth opening shape shaping device according to claim 5. The moving member is a rotary table that is connected to a drive source and intermittently rotates in a horizontal plane, the grippers are provided around the rotary table, each holding a bag in a suspended shape, and the correction member is a predetermined member The bag mouth opening shape shaping device according to any one of claims 1 to 6, wherein the bag mouth opening shape shaping device is provided in an article filling station which is an intermittent stop position.

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