JP2023086344A - Packaging machine - Google Patents

Abstract

To provide a packaging machine with good work efficiency.SOLUTION: There is provided a packaging machine 10 that puts a work into a bag H with one openable side, which comprises: a magazine 21 capable of accommodating a plurality of bags H stacked in a thickness direction; a conveying unit 31 for taking out the bag H from the magazine 21; and a turning unit 40 that turns the bag H conveyed from the conveying unit 31 so that an opening H3 of the bag H faces upward. The conveying unit 31 includes: a supply pad 331 that sucks and holds the lowest bag H in the magazine 21; and reciprocating driving means 31 for reciprocating the supply pad 331 between the magazine 21 and the turning unit 40. Thereby, it is possible to shorten the time per cycle and improve work efficiency.SELECTED DRAWING: Figure 1

Description

There is an application for exception to loss of novelty

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging machine that packs a predetermined workpiece in a bag that can be opened on one side.

2. Description of the Related Art Conventionally, a packaging machine described in Patent Document 1 is known as a packaging machine that puts works into a predetermined bag. The packaging machine described in Patent Document 1 includes a magazine that can accommodate a plurality of bags stacked in the thickness direction, a suction pad that suctions and holds the bag positioned at the top of the magazine, and a suction pad that moves up and down. and a supply unit composed of a lifting drive source that rotates the suction pad and the bag together with the lifting drive source. An opening mechanism for opening the bag, a loading mechanism for loading the workpiece into the bag opened by the opening mechanism, and a sealing unit for sealing the opening of the bag into which the workpiece is loaded by the loading mechanism are provided. . As a result, the opening process and the loading process can be performed without moving the bag supplied from the supply unit from the bag supply position, so the packaging machine can be made relatively small.

Japanese Patent No. 5016275

However, the packaging machine described in Patent Document 1 is configured such that the suction pad for taking out the bag from the magazine continues to hold the bag even during the loading operation of the workpiece. I couldn't take out the next bag. As a result, the bag taking-out process, the turning process, and the work-loading process require time each time, so there is a problem that the time per cycle becomes long. In addition, since the bag is held only by the suction pad even when the work is loaded, there is a problem that the bag may drop off from the suction pad due to the impact of the loaded work.

SUMMARY OF THE INVENTION The present invention has been created in view of the above problems, and an object of the present invention is to provide a packaging machine with good work efficiency. In order to achieve this object, the present invention provides a packaging machine for inserting works into a bag having one side that can be opened, and a magazine capable of accommodating a plurality of the bags stacked in the thickness direction, and the magazine. It is characterized by having a conveying section for taking out a bag from an empty bag, and a turning unit for turning the bag delivered from the conveying section so that the opening of the bag faces upward. In addition, it is preferable that the conveying section has a supply pad for sucking and holding the bag at the lowest position in the magazine, and reciprocating driving means for reciprocating the supply pad between the magazine and the turning unit. Moreover, it is preferable to have a grasping unit that grasps the bag turned by the turning unit. Further, the gripping unit is configured to lower the bag after the workpieces are put into the bag, and a sealing unit for sealing the opening of the bag is provided at the lowered position of the gripping unit. is preferably provided. Moreover, the conveying section is provided with an opening pad facing the supply pad and an opening pad elevating section for moving the opening pad toward the supply pad, and the opening pad and the supply pad move toward and away from each other. It is preferable that the swivel unit is provided with a swivel support part that enters into the bag and supports the bag from the inside. Moreover, it is preferable that the swivel support section includes an expansion rod that swings in a direction parallel to the bag, and the gripping mechanism is configured to grip the bag together with the expansion rod.

In the packaging machine of the present invention, the conveying section for taking out the bags from the magazine and the turning unit for turning the bags taken out of the magazine by the conveying section are separately provided. After that, it becomes possible to prepare the next bag. As a result, there are advantages such as a reduction in the waiting time of each mechanism and a shortening of the time per cycle. In addition, since the conveying section is configured to take out the bag at the bottom of the magazine and the drive mechanism is not arranged above the magazine, there is an advantage that bags can be replenished in the magazine without stopping the packaging machine. These have advantages such as improved work efficiency. Moreover, since the gripping unit grips the bag rotated by the rotating unit, there is an advantage that the bag can be prevented from falling off. Furthermore, after the work is put into the bag, the gripping part descends to the sealing unit. can be received, which has the advantage of shortening the cycle time. In addition, the conveying unit is provided with an opening pad facing the supply pad for taking out the bag, and the bag is supplied to the turning unit in an opened state, and the turning unit enters the inside of the bag to support it from the inside. Advantages include that the bag can be received smoothly when it is transferred from the conveying section to the swiveling support section. Furthermore, since the gripping portion is configured to grip the swivel support portion, the bag can be gripped more firmly, and the bag is less likely to come off.

It is a partial cross-sectional side view showing the structure of the packaging machine according to the present invention. 1. It is a partial cross-sectional side view which shows the operation|movement which transfers to the next state from the state of FIG. FIG. 3 is a partial cross-sectional side view showing an operation of shifting from the state of FIG. 2 to the next state; BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a plan view showing the structure of a packaging machine according to the present invention, where (a) is a plan view of a state in which a supply cylinder extends a piston rod, and (b) is a state in which the supply cylinder extends a piston rod; It is a top view. FIG. 2 is an enlarged view of part A in FIG. 1 showing the operation of the supply unit of the packaging machine according to the present invention, (a) is an enlarged side view of the main part showing the state of taking out the bag, and (b) is the bag in the middle of transfer; FIG. 4C is an enlarged side view of a main part showing a state, and (c) is an enlarged side view of a main part showing a state in which the opening of the bag is opened by gripping claws. 1 is a schematic front view showing the structure of a magazine of a packaging machine according to the present invention; FIG. FIG. 2B is an enlarged view of the B portion of FIG. 2 showing the operation of the turning unit of the packaging machine according to the present invention, (a) is an enlarged side view of a main part showing a state in which the turning member is vertical, and (b) is an enlarged side view of the main part of the turning member. FIG. 4 is an enlarged side view of a main part showing a horizontal state; FIG. 5 is an enlarged view of the C part of FIG. 4 showing the operation of the turning unit of the packaging machine according to the present invention, where (a) is an enlarged plan view of the main part showing a state in which the expansion rod is closed, and (b) is expanded; FIG. 4 is an enlarged plan view of a main part showing a state in which the rod is opened; FIG. 4 is an operation explanatory view showing the operation of the gripping unit of the packaging machine according to the present invention, (a) is an enlarged plan view showing the main part before the gripping unit grips the bag, and (b) is an enlarged plan view of the gripping unit. FIG. 4C is an enlarged plan view of a main part showing a state in which the bag is gripped, (c) is an enlarged plan view of the main part showing a state in which the bag is sealed by the sealing unit, and (d) is a side view of the gripped bag; It is the D part enlarged view of (b) which shows the state of a side edge part. Fig. 8 is an operation explanatory section showing another embodiment of the turning unit of the packaging machine according to the present invention, wherein (a) is an enlarged side view of a main part showing a state in which the rocking cylinder is contracted, and (b) is a rocking cylinder; is an enlarged side view of a main part showing a state in which is stretched;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below based on the drawings. 1 to 9, reference numeral 10 denotes a packaging machine for putting predetermined works (not shown) into bags H. As shown in FIG. As shown in FIG. 1, the packaging machine 10 includes a supply unit 20 capable of supplying bags H one by one, and a supply unit 20 disposed in front of the supply unit 20, which vertically positions the bags H supplied from the supply unit 20. A swivel unit 40 for swiveling, a gripping unit 50 for gripping the bag H in a vertical posture swiveled by the swivel unit 40, a sealing unit 60 for sealing the bag H, and a control unit for controlling the driving of each mechanism. (not shown).

The bag H is a rectangular flat bag formed by folding a resin film. It has two sealed long sides H2, H2 (hereinafter referred to as lateral side edges H2, H2) and an unsealed short side H3 (hereinafter referred to as opening H3) facing bottom H1. are doing. The bag H is housed in the magazine 21 in a horizontal position with the opening H3 facing forward.

The magazine 21 of the supply unit 20 is configured to be able to store a plurality of horizontally arranged bags H stacked in the thickness direction. A frame portion 26 is provided. The bottom part 22 of the magazine 21 has a support plate 23 fixed on the base 11 of the packaging machine 10. The support plate 23 has a front-rear dimension substantially equal to that of the bag H in the front-rear direction. The configured lateral support members 241, 241 are fixed. The side support members 241, 241 are formed in a columnar shape and are arranged with a predetermined gap therebetween so as to abut on the lateral side edges H2, H2 of the bag H. As shown in FIG. Between the side support members 241, 241, a plate-like rear support member 242 having a diameter slightly smaller than that of the side support members 241, 241 is arranged. The rear support member 242 is set to be half or less of the longitudinal dimension of the bag H, and is arranged so as to support the bottom portion H1 of the bag. With these structures, the bags H placed in the magazine 21 are supported by the side support members 241, 241 at the lateral side edges H2, H2, while the lateral central portion is curved downward, and the curved portion is curved downward. It will be in a state of abutting on the rear support member 242 . The vicinity of the opening H3 of the bag H, which is not supported by the rear support member 242, is floating above the support plate 23, forming a gap therebetween. A notch groove 25 (hereinafter referred to as a pad passage path 25) is formed in the support plate 23 and the base 11 at a position corresponding to the lateral center of the bag. , and a supply pad 331, which will be described later, is configured to be movable back and forth and up and down. Note that the support plate 23 and the pad passage path 25 extend to the vicinity of the turning unit 40 arranged forward, and when the bag H is supported by the turning unit 40 described later as shown in FIG. The front end portion of the support plate 23 is configured to support both end sides of the bottom portion H1 of the bag H. As shown in FIG.

On the other hand, the frame portion 26 has a pair of side walls 27, 27 that support the bag H from both lateral sides. The side walls 27, 27 are fixed on the base 11, and their upper ends are set to be positioned above the uppermost bag H, and their rear ends are bent inward so as to support the bag H. It is configured to be supportable also from the rear. A regulating member 28 is attached to the front ends of the side walls 27 , 27 . The restricting member 28 is a plate material that supports the bag H from the front, and has a passage hole 281 formed in the center of the lower end thereof. The passage hole 281 has a lateral dimension slightly shorter than the lateral dimension of the bag H and a height dimension slightly longer than the diameter of the side support members 241, 241. A restricting protrusion 282 is formed in the portion. The restricting convex portion 282 extends from the upper portion of the passage hole 281 into the pad passage path 25, laterally divides the passage hole 281, and is sufficiently narrower than the pad passage path 25. As shown in FIG. A bag H having a downwardly curved central portion in the horizontal direction can pass therethrough. With these configurations, only the lowermost bag H whose lateral central portion is pulled downward by the supply pad 331 of the conveying section 31 to be described later can pass through the passage hole 281 and the pad passage path 25 .

Note that the magazine 21 has a cover member 29 that is placed on the bag H that is stored. The cover member 29 is a plate material that is the same shape as the bag H or smaller than the bag H, and a downwardly extending pressing projection 291 is formed on the lower surface of the cover member 29 . This pressing projection 291 is provided so as to face a supply pad 331, which will be described later, and presses the vicinity of the opening H3 of the bag H downward. Therefore, the lowest bag H comes into contact with the bottom portion 22 regardless of the number of bags H stored in the magazine 21 .

The transport section 31 of the supply unit 20 includes a supply cylinder 32, which is an example of reciprocating driving means fixed to the lower surface of the base 11. The supply cylinder 32 is attached forward of the magazine 21, The piston rod is arranged to extend rearward. A lower suction part 33 capable of reciprocating in the front-rear direction is attached to the tip of the piston rod of the supply cylinder 32 . The lower suction unit 33 is provided with a suction pad 331 (hereinafter referred to as a supply pad 331) arranged below the pad passing path 25 and a supply pad elevating unit 332 for raising the supply pad 331 toward the bag H. A suction means such as a vacuum generator is connected to the supply pad 331 . In the lower suction unit 33 configured as described above, the supply pad 331 is driven by the supply pad elevating unit 332 to be vertically movable directly below the magazine 21, and is driven by the supply cylinder 32 to lift the magazine 21 and the turning unit. Since it is possible to reciprocate under the magazine 21 , it is possible to extract the lowest bag H from the magazine 21 and supply it to the turning unit 40 . The stroke of the supply pad lifting section 332 is such that when the drive rod is extended, the supply pad 331 is positioned above the upper ends of the side support members 241 and 241, and when the drive rod is contracted, the supply pad 331 is positioned above the upper ends of the side support members 241 and 241. is positioned below the lower end of the regulation convex portion 282 .

A sliding rod 34 extending in the front-rear direction is fixed on the base 11, and an upper suction portion 35 is attached to the sliding rod 34 so as to be slidable along the sliding rod 34. As shown in FIG. The upper suction section 35 is provided with a suction pad 351 (hereinafter referred to as an opening pad 351) arranged above the pad passing path 25 and an opening pad elevating section 352 for lowering the opening pad 351 toward the pad passing path 25. A suction means such as a vacuum generator is connected to the opening pad 351 . The upper suction portion 35 is connected to the lower suction portion 33 via a connecting spring 36, and is configured to follow the movement of the lower suction portion 33 in the front-rear direction. The rod 34 is provided with a stopping portion 341 that abuts against the upper suction portion 35 before the upper suction portion 35 collides with the magazine 21 . Therefore, the upper suction portion 35 reciprocates in the front-rear direction following the lower suction portion 33 until it contacts the stop portion 341, and after contacting the stop portion 341 as shown in FIG. It waits in front of the magazine 21 . In addition, the opening pad 351 is arranged so as to be positioned slightly ahead of the supply pad 331 of the lower suction portion 33 when driven.

The conveying unit 31 configured as described above moves the supply pad 331 and the opening pad 351 toward and away from each other after the lower suction unit 33 extracts the lowest bag H from the magazine 21 as described above. , the opening H3 of the bag H can be opened. After that, the supply cylinder 32 is driven to move the bag H with the opening H3 open toward the turning unit 40 .

The turning unit 40 has a turning member 41 arranged below the hopper 12 fixed to the base 11 and a swinging cylinder 47 which is an example of a swing driving source for swinging the turning member 41 . there is The turning member 41 is configured to rotate around support shafts 46 fixed to the base 11, and a supply hole 42 sufficiently large for the work is formed through it in the longitudinal direction. ing. The supply hole 42 is configured to communicate with the hopper 12 when the turning member 41 is in the vertical position, and is configured to guide the work passing through the hopper 12 downward. On the other hand, the rocking cylinder 47 is attached to the lower surface of the base 11, and the tip of the piston rod of the rocking cylinder 47 is connected to the turning member 41 through a connecting member 471 that allows angle change. The stroke of the rocking cylinder 47 is such that when the piston rod is extended, the revolving member 41 assumes a horizontal position facing the magazine 21 as shown in FIG. The dimensions are set so that the turning member 41 is in a vertical posture. The hopper 12 has a funnel shape through which the work can pass, and a work supply device (not shown) capable of feeding a predetermined amount of work into the hopper 12 is provided at the upper opening of the hopper 12 . ing.

A swivel support portion 43 for supporting the bags H supplied from the supply unit 20 is provided on the outer surface of the swivel member 41 . The swiveling support portion 43 is composed of a pair of expansion rods 44, 44 that can swing parallel to the bag H and a pair of expansion plates 451, 452 that can swing vertically to the bag H. The spreading plates 451 and 452 and the spreading rods 44 and 44 are designed so that their tips protrude outward in the rotational direction (position away from the spindles 46 and 46) from the tip of the turning member 41. As shown in FIG. A compression spring (not shown) provided between the expansion rods 44 and 44 and the swivel member 41 biases the ends thereof in a direction in which the expansion plates 451 and 452 are opened. It is composed of a leaf spring that biases the tip in the opening direction. On the other hand, a pair of pressing cylinders 48, 48 are attached to the base 11 with a predetermined gap in the lateral direction so as to sandwich the rotating member 41 in a horizontal posture. A piston rod is arranged to abut the expansion rods 44,44. Further, the base 11 is provided with a pressing pin 491 capable of pressing the spreading plate 451 from above when the turning member 41 is in a horizontal posture, and the connecting member 471 is provided with a turning member. A pressing pin 492 is provided so as to be able to press the expanding plate 452 from below when the 41 assumes a horizontal posture. Therefore, the expansion rods 44, 44 and the expansion plates 451, 452 are pressed in the closing direction by the pressing cylinders 48, 48 and the pressing pins 491, 492. As shown in FIG. As a result, when the expansion rods 44, 44 and the expansion plates 451, 452 are pressed by the pressing cylinders 48, 48 and the pressing pins 491, 492, they stand by on the moving path of the bag H in the closed state. When the cylinders 48, 48 and the pressing pins 491, 492 are released, the bag H can be expanded and supported. With these structures, the turning unit 40 can support the horizontal bag H supplied from the supply unit 20, and turn the bag H by 90 degrees to take the vertical position.

The gripping unit 50 is composed of an elevating cylinder 51 that vertically extends and retracts a piston rod, and a gripping portion 52 that is fixed to the tip of the piston rod of the elevating cylinder 51 . As shown in FIG. 9A, the grip portion 52 is provided with laterally extending guide rods 53, 53 and a pair of slide blocks 54, 54 sliding along the guide rods 53, 53. The slide blocks 54, 54 are connected so as to be able to approach and move away from each other by means of a pawl reciprocating cylinder 55 that laterally extends and retracts the piston rod. The slide blocks 54 , 54 are attached with pawl fixing plates 56 , 56 via a slide table configured to be slidable in the front-rear direction. Gripping claws 57, 57 for gripping the folded bag H and claw opening/closing drive units 58, 58 for driving the gripping claws 57, 57 to open and close are attached. The gripping claw 57 is composed of a fixed claw 571 fixed to the claw fixing plates 56, 56 and an opening/closing claw 572 that opens and closes with respect to the fixed claw 571. is formed with unevenness. In the present embodiment, the tip of the opening/closing claw 572 is constantly urged by the claw spring in a direction away from the fixed claw 571 , while the tip is fixed by being driven by the claw opening/closing drive section 58 . It is configured to approach the pawl 571 .

As for the stroke of the claw reciprocating cylinder 55, when the piston rod is extended, the distance between the gripping claws 57, 57 becomes wider than the width of the bag H as shown in FIG. As shown in FIG. 9(b), the claw fixing plates 56, 56 come into contact with the expansion rods 44, 44 when contracted. In addition, the claw fixing plates 56, 56 are always urged rearward so that the gripping claws 57, 57 can grip the bag H in the vertical posture, and the bag H gripped by the gripping claws 57, 57 can be gripped. waits at a predetermined position between a heater member 61 and a facing member 62 of the sealing unit 60, which will be described later. The gripping claw 57 and the claw opening/closing drive portions 58, 58 configured in this way can move in the front-rear direction by the slide table, and can be moved toward and away from each other by being driven by the claw reciprocating cylinder 55. As shown in FIG. Further, the stroke of the lifting cylinder 51 is such that when the piston rod is extended, the gripping claws 57, 57 move the bag H into the inside of the bag H as shown in FIG. While holding the rods 44, 44 together, the size is set so that the swivel support portion 43 can be removed from the bag H as shown in FIG. 3 when the piston rod is contracted.

The sealing unit 60 includes a heater member 61 arranged at a height slightly above the grip portion 52 that has reached the lowered position, a facing member 62 arranged to face the heater member 61, and the heater A sealing cylinder 63 reciprocatingly moves the member 61 toward the opposing member 62. The heater member 61 is configured to be heated to a temperature at which the bag H can be welded by being energized. there is The heater member 61 and the facing member 62 are spaced apart by a predetermined distance so that the bag H containing the workpieces can pass therethrough. The opening H3 of the bag H is sandwiched between the heater member 61 and the opposing member 62 by moving the heater member 61 toward the opposing member 62 . Therefore, the opening H3 of the bag H is welded. Further, a guide plate 64 is provided above the facing member so that the bag H, which has been driven down by the gripping unit 50, can be reliably inserted between the heater member 61 and the facing member 62. As shown in FIG. Furthermore, below the sealing unit 60, a discharge chute 70 for discharging the bags H to a predetermined discharge position is provided.

Next, the operation of the packaging machine 10 configured as described above will be described.
First, in the standby state, the lower suction portion 33 is retracted to the lower side of the magazine 21, and the upper suction portion 35 is driven to the lower suction portion 33 by the tension spring 37, and the stop portion 341 is moved. and retreat until it abuts. In this state, when a drive signal is input, the control section drives the suction means and also drives the supply pad lifting section 332 to raise and lower the supply pad 331 toward the lowest bag H a plurality of times. Let In this manner, the supply pad 331 moves up and down a plurality of times to swing the bags H in the magazine 21 up and down, so that the bags H in the magazine 21 are released from the fixed state in which the central portion of the bag H in the horizontal direction is bent downward. , can be pulled out smoothly. In addition, the suction means is driven, and the supply pad 331 sucks the lowermost bag H that abuts against it, so the lowermost bag H is drawn downward as the supply pad 331 descends. At this time, a gap is formed between the support plate 23 and the vicinity of the opening H3 of the bag H by the side support members 241, 241 and the rear support member 242, and the vicinity of the opening H3 of the bag H within the gap is free. , the suction pad 331 can pull down only the lowermost bag H near the opening H3. As a result, the center portion of the opening H3 of the lowermost bag H is drawn downward from the lower end of the regulating convex portion 282 as shown by the two-dot chain line in FIG. The corners H2, H2 are disengaged from the side support members 241, 241 and bent into a shape that allows passage through the passage hole 281. As shown in FIG. After that, the supply cylinder 32 is driven to advance the supply pad 331 . At this time, since the lowermost bag H is bent as described above, it can pass through the passage hole 281 without being locked by the restricting member 28, while the bags H on the next and subsequent stages are engaged with the restricting member 28. be stopped. As a result, the bag H at the next stage does not come out at the same time as the bag H at the lowest level, and only one bag H at the lowest level can be pulled out from the magazine 21.例文帳に追加As described above, when the opening H3 of the bag H is pulled down by the supply pad 331, the lateral side edges H2, H2 are drawn toward the center by the amount of the opening H3 lowered. Slack is generated on the upper surface near H3. However, the slack portion of the upper surface is pressed by the bags H in the next and subsequent stages above or by the pressing projections 291 of the lid member 29, and slackens downward. Therefore, when the bag H is pulled down onto the supply pad 331, the opening H3 is not opened, and the bag H can be bent in the above-described state. pass is possible. Furthermore, the lowermost bag H has its lateral side edges H2, H2 drawn toward the center as described above, and the corners on the side of the opening H3 are disengaged from the side support members 241, 241. The weight of the bags H stacked on the top is not applied, and the contact area with the next-stage bag H positioned directly above becomes small. As a result, the lowermost bag H has less friction, and can be pulled out smoothly. After passing through the passage hole 281 in this way, the bag H is driven by the supply cylinder 32 and moves toward the turning unit 40 while its lateral side edges H2, H2 are supported by the support plates 23, 23. As shown in FIG.

After the bag H is pulled out from the magazine 21 as described above, the control section further drives the supply cylinder 32 to advance the lower suction section 33 toward the turning unit 40 . After the lower suction unit 31 that has started to move toward the swivel unit 40 reaches below the upper suction unit 35, the control unit drives the suction means so that the opening pad can also be suctioned and supplied. The pad lifting section 332 and the opening pad lifting section 352 are driven to bring the supply pad 331 and the opening pad 351 close to each other. As a result, the opening pad 351 sucks and holds the bag H as shown in (b) of FIG. 351 is separated to open the bag H. At this time, as described above, the opening pad 351 is displaced from the supply pad 331, and the front and back surfaces of the opening H3 and its vicinity are bent in different shapes while being opened. It becomes possible. The bag H thus opened is moved toward the turning unit 40 arranged in front by the drive of the supply cylinder 32 .

As shown in FIG. 5(c), the bag H moving forward in an open state as described above covers the swivel support portion 43 of the swivel unit 40 waiting on its movement path. At this time, the expansion rods 44, 44 and the expansion plates 451, 452 of the swivel support portion 43 are moved to the pressing cylinders 48, 48 and the pressing pins 491 and 491, respectively, as shown in FIGS. 8(a) and 7(b). Since the bag H is on standby in a closed state sandwiched by 492, the opening H3 can be covered smoothly without being caught by them. At this time, as described above, the opening pad 351 is displaced forward from the supply pad 331 and sucks and holds the opening H3 side of the bag H, so that the upper side of the opening H3 is less likely to hang downward. As a result, when the bag H covers the swivel support part 43, the swivel support part 43 does not get caught in the opening H3, and the opening pad 351 is prevented from coming off the bag H and the bag H is torn. . When the bag H covers the expansion rods 44, 44 and the expansion plates 451, 452 in this manner, the control unit causes the pressing cylinders 48, 48 to contract, thereby opening the expansion rods as shown in FIG. 8(b). 44, 44 are expanded. As a result, the expansion rods 44, 44 abut on the lateral side edges H2, H2 of the inner surface of the bag H to support the bag H in a laterally open state. After that, the control unit stops the suction means to remove the supply pad 331 and the opening pad 351 from the bag H, and double-acts the supply cylinder 32 to move the lower suction unit 33 and the upper suction unit 35 to the magazine 21. move towards. After the lower suction part 33 is separated from the bag H, the control part drives the swing cylinder 47 to contract to rotate the rotating member 41 . At this time, as the turning member 41 assumes a vertical posture, the pressing pins 491 and 492 are released from the spreading plates 451 and 452, and the spreading plates 451 and 452 are gradually opened as shown in FIG. 7(a). As a result, the opening H3 of the bag H is stretched by the spreading plates 451, 452 and the spreading rods 44, 44, so that it is prevented from falling off during turning. In addition, since the bag H rotates with the expansion rods 44, 44 and the expansion plates 451, 452 inserted therein, the bag H does not deform due to the influence of the wind or the like during the rotation. As shown in (a), it is possible to reach between the gripping claws 57, 57 without fail.

When the bag H reaches between the gripping claws 57, 57 as described above, the controller drives the claw reciprocating cylinder 55 of the gripping unit 50 to move the gripping claws 57, 57 toward the bag H. As a result, the side edges H2, H2 of the bag H enter deeply between the gripping claws 57, 57 as shown in FIG. At this time, since the gripping claws 57, 57 are configured to be movable in the front-rear direction by the slide table, the front-rear positions of the gripping claws 57, 57 are corrected so as to follow the spreading rods 44, 44. FIG. After that, when the claw reciprocating cylinder 55 is completely contracted, the control section drives the claw opening/closing drive sections 58 and 58 to close the gripping claws 57 and 57 . As a result, the gripping unit 50 is arranged between the expanding rod 44 and the claw fixing plate 56, between the expanding rod 44 and the fixing claw 571, between the expanding rod 44 and the opening/closing claw, and between the expanding rod 44 and the opening/closing claw, as shown in FIG. The periphery of the lateral side edge H2 can be sandwiched between the three points between 572 and the bag H can be firmly gripped. When the gripping claws 57 grip the bag H in this manner, the work supply device is driven to feed the work into the bag H through the hopper 12 and the supply hole 42 of the turning means. At this time, the expansion rod 44 and expansion plates 451 and 452 widen the opening H3 of the bag H in the front, rear, left and right directions, and the expansion rod 44 and the expansion plates 451 and 452 opening the opening H3. Since the supply hole 42 is formed in the center, the work is reliably guided into the bag H. In addition, since the gripping claws 57 firmly grip the bag H together with the expansion rod 44 as described above, the bag H is less likely to shift and a relatively large amount of workpieces can be supplied. This makes the product relatively clean. Furthermore, the unevenness formed on the facing surfaces of the gripping claws 57, 57 serves as a non-slip, so that the bag H can be further prevented from slipping down.

When a predetermined amount of workpieces is supplied into the bag H as described above, the control unit drives the lifting cylinder 51 to hold the workpieces until the opening H3 is positioned between the heater member 61 and the opposing member 62. The claws 57, 57 are lowered. As a result, the bag H is removed from the swivel support portion 43 . When the opening H3 of the bag H reaches between the heater member 61 and the facing member 62, the control unit stops the lifting cylinder 51 and doubles the claw reciprocating cylinder 55 as shown in FIG. 9(c). The gripping claws 57, 57 are moved away from each other. As a result, the bag H gripped by the gripping claws 57, 57 gradually expands in the lateral direction, and the opening H3 is stretched. After that, the control unit drives the sealing cylinder 63 to move the heater member 61 toward the opposing member 62 . As a result, when the bag H is sandwiched between the heater member 61 and the facing member 62 , the controller energizes the heater member 61 . As a result, the heater member 61 and the opening H3 of the bag H in contact therewith are heated and the opening H3 is welded. At this time, as described above, the gripping claws 57, 57 are configured to be slidable in the front-rear direction by the slide table, and can move until the bag H comes into contact with the facing member 62. The bag H can be sandwiched between the heater member 61 and the opposing member 62 only by moving the heater 61 toward the opposing member 62 . As a result, a driving source for moving the facing member 62 is not required, and the manufacturing cost can be reduced. In addition, as described above, the bag H is spread laterally and welded with the opening H3 stretched. Therefore, wrinkles are not formed in the welded portion. After the bag H is sealed in this manner, the control section drives the sealing cylinder 63 again to separate the heater member 61 from the bag H. As shown in FIG. At this time, since the gripping claws 57, 57 keep gripping the bag H, the heater member 61 can be separated from the bag H smoothly. Further, as described above, the claw fixing plates 56, 56 are biased rearward, and when the biasing of the heater member 61 is released, the claw fixing plates 56, 56, the gripping claws 57, 57, and the bag are released. H moves rearward and smoothly separates from the opposing member 62 as well. These prevent the bag H from remaining attached to the heater member 61 or the facing member 62 . After that, the gripping unit 50 double-acts the claw opening/closing drive portions 58 and 58 to open the gripping claws 57 and 57 . At this time, the claw opening/closing driving units 58, 58 open and close the gripping claws 57, 57 a plurality of times to reliably drop the bag H from the gripping claws 57, 57. FIG. As a result, as indicated by the two-dot chain line in FIG. 3, the bag H released from the gripping claws 57, 57 drops onto the discharge chute 70 and is discharged to a predetermined discharge point.

Since the packaging machine 10 configured as described above is configured to transfer the bag H from the supply unit 20 to the turning unit 40, the supply unit 20 is in the process of turning the bag H by the turning unit 40 or the like. In addition, it becomes possible to take out the bag H of the next stage from the magazine 21 during the loading process of the work. Therefore, when the turning member 41 returns to the initial position after the turning process and the loading process are finished, the bag H of the next stage can be supplied immediately. Similarly, since it is configured to transfer from the turning unit 40 to the gripping unit 50 , the turning unit 40 can transfer the bag H from the supply unit 20 to the next stage during the sealing process of the bag H by the gripping unit 50 and the sealing unit 60 . bag H and can be turned. Since the bag H is transferred between the supply unit 20 and the turning unit 40 and between the turning unit 40 and the gripping unit 50 in this way, each mechanism transfers the bag H to the next process and then the next process. It becomes possible to receive the bag H of the stage. As a result, the standby time of each mechanism is shortened, and the time per cycle is shortened, thereby improving working efficiency. In addition, since the supply unit 20 is configured to take out the bag H at the lowest position in the magazine 21, the bag H can be extracted in the same operation without being affected by the number of bags H remaining in the magazine 21. It becomes possible. At this time, the lid member 29 is placed above the bags H, and the lid member 29 pushes the bags H downward. 331 is easily brought into contact with the bag H. In particular, since the pressing protrusion 291 of the lid member 29 is formed at a location facing the supply pad 331 , the pressing protrusion 291 and the supply pad 331 abut against each other so as to sandwich the bag H therebetween. As a result, when the bag H contacts the supply pad 331, the bag H is prevented from being warped upward, and can be reliably sucked and held. Moreover, since the structure is such that the lowest bag H in the magazine 21 is pulled out, there is no need to stop the packaging machine 10 when adding a bag H to the magazine 21 . Therefore, the operating time of the packaging machine 10 can be lengthened, and the working efficiency is further improved.

In the supply unit 20, the upper suction portion 35 and the lower suction portion 33 are connected by a connection spring 36, and both the lower suction portion 33 and the upper suction portion 35 can be moved by driving the supply cylinder 32. Therefore, there is no need for position control using a plurality of drive sources, resulting in a relatively inexpensive configuration. In addition, the bag H extracted from the supply unit magazine 21 is moved in the horizontal direction and delivered to the turning unit 40 arranged on the movement path. Since the bag H and the turning unit 40 turn in a parallel state, the movable range of the turning becomes relatively narrow. As a result, the packaging machine 10 can be made smaller. At the same time, unlike the conventional packaging machine, it is not necessary to rotate the suction hose or other piping that connects the suction pad that attracts the bag and the suction means at the same time as the bag. There are other advantages as well.

The packaging machine 10 according to the present invention is not limited to the one described above, and various modifications can be made without departing from the gist of the invention. For example, in the present embodiment, the bag H is a rectangular flat bag with lateral side edges H2, H2 welded together, but it may be a flat bag with gussets formed around the circumference, or may be a flat bag with a shape other than a rectangular shape. It is preferable that the magazine 21 is appropriately changed according to the shape of the bag H. The supply cylinder 32, swing cylinder 47, pressing cylinder 48, lifting cylinder 51, claw reciprocating cylinder 55, and sealing cylinder 63 are examples of moving means for reciprocating various parts, and are not limited to cylinders. , a ball screw mechanism consisting of a ball screw and a drive nut screwed onto it, or other moving means may be used without any problem. may be changed. When the rocking cylinder 47 is attached forward of the turning member 41, the packaging machine 10 is downsized in the front-rear direction and can be installed in a narrower space.

H... Bag H1... Bottom H2... Side edge H3... Opening 10... Packaging machine 11... Base 12... Hopper 20... Supply unit 21... Magazine 22... Bottom 23... Support plate 241... Side support member 242... Rear Supporting member 25 Pad passing path 26 Frame 27 Side wall 28 Regulating member 281 Passing hole 282 Regulating projection 29 Lid member 291 Pressing projection 31 Conveying part 32 Supply cylinder 33 Lower suction part 331 ... supply pad 332 ... supply pad elevating section 34 ... sliding rod 341 ... stopping section 35 ... upper suction section 351 ... opening pad 352 ... opening pad elevating section 36 ... connection spring 40 ... turning unit 41 ... turning member 42 ... supply hole 43 ... Rotating support part 44 ... Expansion rod 451, 452 ... Expansion plate 46 ... Support shaft 47 ... Swing cylinder 471 ... Connection part 48 ... Holding cylinder 491, 492 ... Holding pin 50 ... Grasping unit 51 ... Elevating cylinder 52 ... Grasping part 53 : Guide rod 54 : Slide block 55 : Claw reciprocating cylinder 56 : Claw fixing plate 57 : Grasping claw 571 : Fixed claw 572 : Open/close claw 58 : Claw open/close drive unit 60 : Sealing unit 61 : Heater member 62 : Opposed member 63 ... sealing cylinder 64 ... guide plate 70 ... discharge chute

Claims (6)

In a packaging machine that puts a work into a bag that can be opened on one side,
A magazine capable of storing a plurality of the bags stacked in the thickness direction, a conveying section for taking out the bags from the magazine, and a turning unit for turning the bag delivered from the conveying section so that the opening of the bag faces upward. A packaging machine characterized by having 2. The conveying unit according to claim 1, wherein the conveying unit has a supply pad for sucking and holding the bag at the lowest position in the magazine, and reciprocating driving means for reciprocating the supply pad between the magazine and the turning unit. packaging machine. 3. The packaging machine according to claim 1, further comprising a gripping unit that grips the bag turned by the turning unit. The gripping unit is configured to lower the bag after the workpieces are put into the bag, and a sealing unit that seals the opening of the bag is provided at the lowered position of the gripping unit. 4. The packaging machine according to claim 3, wherein The conveying section is provided with an opening pad facing the supply pad and an opening pad elevating section for moving the opening pad toward the supply pad. is configured to open the
5. The packaging machine according to any one of claims 2 to 4, wherein the turning unit is provided with a turning support portion that enters into the bag and supports the bag from the inside. 6. The apparatus according to claim 5, wherein the swivel support section has an expansion rod that swings in a direction parallel to the bag, and the gripping mechanism is configured to grip the bag together with the expansion rod. The described packaging machine.

Images