JPH10287301A - Forming, filling and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed a cylindrical sheet according to the mode of a body to be packaged by performing the compensation feed of the cylindrical sheet to the predetermined feed quantity of the cylindrical sheet according to the filling quantity in a forming, filling and packaging machine. SOLUTION: A cylindrical sheet 23 is fed for the predetermined feed quantity according to the filling quantity of an article A to be packaged by a feeding means 5 from a dropping cylindrical body 1 of the article A to be packaged. The feeding means 5 correctly controls the feed by a servo motor. In a condition where the article A to be packaged is filled and horizontal heat seal bars 11a, 11b of a horizontal heat seal means 10 are opened, squeezing plates 14a, 14b of a pair of squeezing members 13 are closed leaving a small clearance 28. When the servo motor of the feeding means 5 is driven in the reverse direction in this condition, the cylindrical sheet 23 is squeezed, and air is discharged through the clearance 28 to form a tightly packaged body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag making / filling / packaging machine for making a bag while filling a tubular sheet fed along a dropping cylinder with an article supplied through the dropping cylinder.

[0002]

2. Description of the Related Art Conventionally, in a vertical bag making and filling machine for packing and packing an article to be packaged, a dropping cylinder for dropping the article to be packaged and a tubular sheet being dropped around the dropping cylinder. Supply means for supplying to the distal end side of the tubular body, and horizontal sealing means for sealing the tubular sheet at a position spaced apart in the longitudinal direction in a state where the packaged object filled through the dropping tubular body is housed inside. I have it. The tubular sheet is sealed by the horizontal sealing means to form a bag bottom portion, and the filled tubular sheet is again sealed at the top of the article to be packaged by the horizontal sealing means, so that the bag is packaged. Completes the body and forms the bag bottom for the next package. By continuing these series of procedures, the manufacture of the bag, the filling of the article to be packaged, and the sealing of the bag can be performed continuously. The forming of the tubular sheet is usually performed by forming a packaging material such as a band-like film into a tubular shape using a tubular former, and stacking the overlapped vertical edges by vertical heat sealing means having a heater inside. As the horizontal sealing means, there is a horizontal heat sealing means provided with a heater inside similarly to the vertical sealing. Each heat sealing means heat seals the packaging material (or the welded layer laminated on the packaging material) by the generated heat. The transverse heat sealing means may be a transverse seal cutter incorporating a cutter. By activating the horizontal seal cutter, the packages sequentially completed by the horizontal seal can be cut from the tubular sheet by the cutter and cut into individual packages. As another lateral sealing means, a binding means is mentioned.

When packing an object to be packaged by a bag making and filling machine, the horizontal sealing means may bite the object to be packaged together with the tubular sheet. For example, in the case where the packaged article is a loose article such as a snack or an elongated bar-shaped article, the packaged article is not filled in a dense state, becomes bulky inside the bag, and the upper end of the packaged article is closed. In some cases, the horizontal sealing means does not fall below the installation position. In such a state, if the horizontal sealing is not performed, or if the horizontal sealing is forcibly performed, the packaged object is sandwiched between the sealing portions, and not only becomes a defective product as a package, Problems such as damage to the horizontal sealing means and stoppage of the operation of the bag making / filling / packaging machine occur.

[0004] Therefore, in order to prevent such a biting phenomenon, an ironing device is conventionally provided in the bag making, filling and packaging machine in connection with the horizontal sealing means. For example, in Japanese Patent Publication No. 6-76087, a horizontal sealing means is a horizontal heat sealing means, and a pair of ironing rods are protruded in the vicinity of the horizontal heat sealing bar on the tubular sheet side from the heater surface. After the packing, the tubular sheet with the bottom seal is filled with the article to be packaged, the pair of ironing rods are closed until a small gap is left between them, and the tubular sheet is sandwiched. The ironing rod is moved downward to squeeze the upper part of the bag, and a path for moving the ironing rod downward while sandwiching the tubular sheet by the ironing rod is given as a part of the path of the box motion. In this ironing apparatus, before the horizontal heat sealing means is closed, the cylindrical sheet is squeezed by a pair of ironing rods from above the portion to be horizontally sealed, through the portion of the tubular sheet to be horizontally sealed, and below. is there. Items to be packaged that accumulate in the bag at a height equal to or higher than the horizontal heat sealing means are scraped off, and the bulky and packed items can be made compact.

As another conventional ironing device, there is one in which the horizontal heat sealing means itself performs an ironing operation. This ironing device will be described with reference to FIGS. 9 and 10. When the tubular sheet 43 fed from the dropping cylinder 41 is dropped on the dropping cylinder 41 and filled with the article to be packaged A, the horizontal heating is performed. The sealing means 50 is operated. The horizontal heat sealing means 50 is composed of a pair of horizontal heat seal bars 51a and 51b arranged outside the tubular sheet 43. The cutting means is incorporated in the horizontal heat sealing means 50. That is, the cutter blade 52 is attached to the horizontal heat seal bar 51a, and the groove 53 into which the cutter blade 52 enters is formed in the horizontal heat seal bar 51b.

The pair of horizontal heat seal bars 51a, 51b starts operating at the height AA shown in FIG. 9 and closes to a position where a slight gap 58 (see FIG. 10) is left. afterwards,
The horizontal heat sealing means 50 is maintained at B-
Lower by the distance L to the height of B. At this time, the feeding of the tubular sheet 43 is prevented by an appropriate brake means, and the tubular sheet 43 is
Is not dragged by the downward movement. As the horizontal heat sealing means 50 descends to the height of BB, the upper space 59 of the packaged object A filled in the tubular sheet 43 is squeezed, and the bulky filled material A is filled. The space between the packages A can be compressed to be compact. At this time, gas such as air in the upper space 59 and the space between the packages A is discharged through the gap 58. Next, the horizontal heat seal bars 51a, 51b are brought close to each other so as to pick up the gap 58, the tubular sheet 43 is sandwiched, and the horizontal heat seal bars 51a, 51b are energized to perform horizontal heat sealing. More cutter 5
2, the package 55 can be cut from the tubular sheet 43. Feeding out of the tubular sheet necessary for the next packaging is performed by moving the horizontal heat sealing means 50 downward with the tubular sheet 43 sandwiched after the brake means is released. In the system in which the cylindrical sheet 43 is fed out by the horizontal heat sealing means 50, the horizontal heat sealing means 50 cannot reversely feed the cylindrical sheet 43.

[0007]

The ironing device for moving the ironing rod or the horizontal heat sealing means downward with the tubular sheet sandwiched between the ironing rods or the horizontal heat sealing means as described above is a bag making and filling machine. Although it was able to cope with high-speed operation to some extent, there are still problems to be solved as described below. That is, the mechanism for causing the ironing rod or the horizontal heat seal means to perform the downward movement as described above and thereafter the movement for returning to the original position (for example, box motion) is complicated, and in particular, the ironing rod is provided as a separate member. With respect to the above, it is difficult to install such a complicated mechanism in a narrow space while preventing interference with the horizontal heat sealing means. Although high-speed operation is possible to some extent, there is a limit in high-speed operation capability mechanically. Also,
The ironing dimensions are not exactly constant due to variations in the relationship with the packaging operation. Furthermore, due to the mechanical box motion, the setting of the ironing size cannot be flexibly changed according to the specification of the package.

[0008] In addition, various forms are required for packages in response to the needs of consumers and the like these days, and bag-making and filling machines are also required to be able to cope with the diversity required for bag packages. Have been. For example, a package with a large space occupied by air other than the packaged object inside the bag package,
Waste of packaging materials. Also, for example, it is desired that a soft and fragile object to be packed such as a fu is tightly packed in a bag so that no movement occurs inside the package. Further, there is a need for a gusset-equipped package in which a gusset is formed at the bottom and the seating is improved as a package that can improve the degree of filling of the packaged object in the package and stabilize display and storage.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems.
It is possible to accurately perform a stepwise feeding that separates the feeding of the tubular sheet predetermined according to the filling amount of the packaged object and the compensating feeding of the packaging material according to the packaging form before and after the feeding. Is to provide a bag making, filling and packaging machine.

[0010] The present invention has been made in order to solve the above-mentioned object.
It is configured as follows. That is, the present invention provides a dropping cylinder for dropping an article to be packaged, a feeding means for sending out a cylindrical sheet along the dropping cylinder, and the packaged article dropped through the dropping cylinder to the cylindrical shape. A transverse sealing means for laterally sealing the tubular sheet to form a sealed package in the sheet is provided, wherein the feeding means is driven by a servomotor and the servomotor and the tubular sheet is A feed member to be engaged, and the feed amount of the tubular sheet by the feed means corresponds to a feed amount predetermined according to a filling amount of the packaged object and a form of the package. And a compensating feed amount for compensating the supply length of the tubular sheet.

According to the bag making, filling and packaging machine of the present invention,
Feeding of the tubular sheet is performed by engaging a feed member driven by a servomotor with the tubular sheet. Since the servomotor is excellent in controlling the speed and the position, the feeding of the tubular sheet is accurately controlled. Further, the feed amount of the tubular sheet is calculated from a feed amount that is predetermined according to the filling amount of the packaged object and a compensation feed amount that compensates for the supply length of the tubular sheet to correspond to the form of the package. Because
The tubular sheet is sent at a predetermined feed amount according to the filling amount to fill the packaged object, and is formed separately from the predetermined feed amount, as a result of bag-making and filling. Compensation feeding is performed to compensate for the length of the tubular sheet to correspond to the form of the package. The compensated feeding may be performed before or after or before or after the feeding of the tubular sheet for a predetermined feeding amount.

In this bag making and filling machine, an ironing member is provided below the horizontal sealing means to be pressed against the cylindrical sheet, and the compensation feed amount is determined by the ironing of the cylindrical sheet by the ironing member and the ironing. In order to absorb the excess of the cylindrical sheet generated in accordance with the above, this is the reverse feed amount in which the cylindrical sheet filled with the article to be packaged is fed backward with the ironing member sandwiched. The package formed by the bag-making and filling machine is a tight package in which the degree of filling of the package is high and the space left above the package in the package is reduced.

According to this bag making / filling / packaging machine, prior to the horizontal sealing of the tubular sheet by the horizontal sealing means, the ironing member is horizontally sealed with the upper portion of the article to be packed filled in the tubular sheet. The tubular sheet is pressed against the portion to be laid, and the tubular sheet is fed backward in that state. As a result, the filled tubular sheet is squeezed by the squeezing member, the object to be packaged is moved to the lower part of the bag, the space above the object to be wrapped in the bag is reduced, and the inside of the bag is reduced. The degree of filling of the tubular sheet is increased, and the portion of the tubular sheet to be horizontally sealed is a portion which is squeezed by the ironing member, and there is no packaged object. There is no intrusion.
The surplus cylindrical sheet generated by the ironing is collected by the reverse rotation of the feeding means and used for the next packaging cycle, so that the packaging material used per package can be saved. Since the ironing operation is performed by feeding the tubular sheet in the reverse direction, there is no need to provide a complicated mechanism for giving a box motion or the like to the ironing member as in a conventional bag making and filling machine.

Further, in this bag making and filling machine, a folding member for folding the tubular sheet from the side is provided above the horizontal sealing means, and the compensating feed amount is determined when the tubular sheet is folded from the side. In order to alleviate the tension of the tubular sheet, the forward feeding amount is such that the tubular sheet is forwarded in accordance with the folding into the tubular sheet by the folding member.
The package to be formed by this bag making and filling machine is a square-bottom type package in which a so-called gusset is folded in the bottom and the seating is good. In order to form the square bottom, the folding member is pushed into the tubular sheet sent from the dropping cylinder from the side. In this state, since the tubular sheet filled in the previous cycle is sealed by the horizontal sealing means, the position of the tubular sheet is fixed by the horizontal sealing means. When the folding member is pushed into the tubular sheet,
The tubular sheet is in a tensioned state, which may cause wrinkles. According to this bag-making filling and packaging machine, when the folding member is pushed into the tubular sheet, the feeding means feeds the compensated feeding amount as a forward feed, so that the tension of the tubular sheet is reduced and wrinkles are formed. Absent.

In this bag making / filling / packaging machine, the feed member is a feed belt or a feed roller which sandwiches the tubular sheet with the dropping cylinder and is driven by the servomotor. Since the cylindrical sheet is fed by a belt that sandwiches the cylindrical sheet between the filling cylinder and the belt, the supply of the cylindrical sheet is controlled near the completed package, and the influence of the expansion of the cylindrical sheet is controlled. It can be reduced as much as possible. With such a feed member, not only the supply in the forward direction but also the supply in the reverse direction can be easily performed by the same feed member.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing one embodiment of a bag making, filling and packaging machine according to the present invention. The bag making filling and packaging machine shown in FIG. 1 has a vertically disposed dropping cylinder 1 for dropping an article to be packaged A, and the article to be packaged A is dropped through the inside of the dropping cylinder 1 from above. Cylindrical sheet 23
Is filled in. A cylindrical former 2 provided on the upper part of the drop cylinder 1 so as to surround the outer periphery of the drop cylinder 1 is for forming the web-like packaging material 22 into a cylindrical shape. The web-shaped wrapping material 22 is drawn out by a feeding means described later and is bent into a tubular shape when passing through the cylinder-forming former 2. It is sent downward along the drop cylinder 1 on the outer peripheral surface.

The web-shaped packaging material 22 folded into a cylindrical shape
Is formed into a cylindrical sheet 23 by the vertical heat sealing means 3 which is a vertical sealing means when fed along the dropping cylinder 1. The vertical heat sealing means 3 is provided on the side of the drop cylinder 1 so as to extend in parallel with the drop cylinder 1. The vertical heat sealing means 3 is composed of vertical heat seal bars 4a and 4b which are provided with a heater inside and which can be brought into contact with and separated from each other.
When the two overlapping longitudinal edges are sandwiched, the two edges are thermally welded. The web-shaped wrapping material 2 becomes a cylindrical sheet 23 having a vertical seal portion 24 and is sent out from the tip of the dropping cylinder 1.

The feeding means 5 for feeding the tubular sheet 23 to the filling position is located at a position on the side of the dropping cylinder 1 and at a position perpendicular to the longitudinal heat sealing means 3 in the circumferential direction of the dropping cylinder 1. Is provided. Although only one feeding means 5 is illustrated in FIG. 1, a similar feeding means 5 is provided at a position opposite to the diameter direction of the dropping cylinder 1, and the tubular sheet 2 is provided.
3 is sandwiched between the drop cylinders 1 from both sides. Each of the feeding means 5 is driven in synchronism, and performs feeding and rewinding of the tubular sheet 23 along the drop cylinder 1.

Each feeding means 5 includes a servomotor 6, a driving pulley 7 driven by the servomotor 6, a driven pulley 8 provided in a pair with the driving pulley 7, a driving pulley 7 and a driven pulley 7. A timing belt 9 wound around the pulley 8; As the servo motor 6, a pulse motor that can operate at an arbitrary timing, has good responsiveness, and can precisely control the feed amount (can be controlled in units of 1 mm) is used. The timing belt 9 is a belt having meshing teeth meshing with the respective pulleys in order to eliminate slippage with the driving side pulley 7 and the driven side pulley 8, and the outside of the timing belt 9 is a cylindrical body into which the cylindrical sheet 23 is dropped. 1 to slide and run
The cylindrical sheet 23 is formed of a material that generates a large frictional force. The entirety of the feeding means 5 is pressed toward the dropping cylinder 1 by appropriate means so as to sandwich the tubular sheet 23 therebetween.

The web-shaped wrapping material 22 is a wrapping material roll 2
1, it is guided around guide rollers 15, 16 and 17, and is sent from the dancer roller 18 to the cylinder former 2 via the guide roller 20. The dancer roller 18 is vertically movable with both ends guided by guide grooves 19 formed in a machine frame (not shown).
In addition to absorbing the slack generated in the above, the web-like packaging material is given an appropriate tension by gravity applied to the dancer roller. When the feeding means 5 is operated, the web-shaped wrapping material 22 is unwound from the wrapping material roll 21 and is pulled with a sufficient force to pass through the cylinder former 2. In addition, it is possible to arrange various sensors such as a marker discriminating sensor during the supply of the web-shaped packaging material 22 to control the feeding of the web-shaped packaging material 22.

The tubular sheet 23 fed to the tip of the dropping cylinder 1 is usually sealed in the horizontal direction in the preceding packaging cycle, so that the portion to be the bottom of the bag is already formed. I have. In this state, the length of one package between the previously formed horizontal heat seal portion 26, that is,
The feeding means 5 is provided by a predetermined feeding amount according to the filling amount.
As a result, the tubular sheet 23 is fed in the forward direction. When the article to be packaged A is filled through the dropping cylinder 1 in accordance with the feeding of the tubular sheet 23, the article to be packaged A accumulates in the tubular sheet 23 having the bottom formed.

Below the dropping cylinder 1, a horizontal heat sealing means 10 is provided as horizontal sealing means. The horizontal heat sealing means 10 includes a pair of horizontal heat seal bars 11a and 11b which are arranged to face each other. The horizontal heat seal bars 11a and 11b each include a heater therein, and can reciprocate so as to approach or separate in synchronization with each other. The horizontal heat seal bars 11a and 11b are cylindrical sheets 2
3, the tubular sheets 23 are welded to each other to form a horizontal heat-sealed portion 26, thereby forming a bag package 25 in which the article to be packaged A is housed. The horizontal heat sealing is performed on the web-shaped packaging material 22 bent in a cylindrical shape by combining the horizontal sealing and the tamping, and preparation for the next packaging cycle is performed. The horizontal heat sealing means 10 has a built-in cutter 12, and the package 12 is cut from the tubular sheet 23 by the cutter 12 at the same timing as the horizontal heat sealing.

An ironing member 13 is disposed immediately below the horizontal heat sealing means 10. The ironing means 13 is composed of a pair of ironing plates 14 a and 14 b, and is capable of coming into contact with and separating from the tubular sheet 23. The operating mechanism of the ironing plates 14a and 14b may be configured as a mechanism independent of the operating mechanism of the horizontal heat sealing means 10, or may be interlocked with the operating mechanism of the horizontal heat sealing means 10. . The ironing plates 14a and 14b are connected to the horizontal heat sealing means 1.
0 is a non-operating state, that is, a pair of horizontal heat seal bars 11
With the a and 11b open, the tubular sheet 23 is closed with a small gap 28 (see FIG. 4) so as not to be completely crushed flat, and the air inside the package body is closed by the gap 2
8 to escape to the upper part of the tubular sheet 23. By the ironing operation of the ironing member 13, the package A is moved to the lower part of the package 25 in the middle of molding, and the upper space 39 of the package A in the package 25 is reduced, and the space between the packages A is reduced. And the degree of filling in the bag is increased. Further, the tubular sheet 23 to be horizontally heat-sealed
Since the packaged object A does not exist in the portion, the horizontal heat seal bars 11a and 11b do not bite the packaged object A.

FIG. 2 to FIG. 5 are explanatory views of a main part for explaining an operation state of the bag making, filling and packaging machine shown in FIG. 2 to 5
The operation of the ironing member 13 will be described based on the above description. FIG. 2 shows a state where the previous packaging cycle has been completed.
The horizontal heat sealing means 10 and the ironing member 13 are in the retracted inoperative position. The end of the tubular sheet 23 is a horizontal heat seal portion 26, and the bottom seal portion of the bag has already been formed.
Filled through. In FIG. 3, the tubular sheet 23 is fed out in a state where the articles A to be packaged are filled in the tubular sheet 23 by the forward supply (forward rotation supply) of the feeding means 5. The feed amount of the tubular sheet 23 in FIGS. 2 to 3 is a feed amount determined in advance according to the filling amount of the packaged object A. FIG.
In this state, the ironing operation is started. As shown in FIG. 2, a limit switch 27 (a switch 27a and its operation element 27b) is provided below the ironing plates 14a and 14b, and the ironing plates 14a and 14b extend to a predetermined gap 28.
When the switch 14b approaches, the limit switch 27 is turned on to output a signal. The description of the limit switch 27 is omitted in FIGS. 3 to 5 in order to avoid complexity. FIG. 4 shows a state in which the ironing operation is performed by the ironing member 13 as the operation next to FIG. The ironing member 13 includes an ironing plate 14.
a and 14b are in the operating position where the limit switch 27 is turned ON and the servo motor 6 is rotating in the reverse direction. FIG. 5 shows a state where the ironing operation has been completed.
The package 25 is cut from the tubular sheet 23 by the cutter 12 in accordance with the formation of the horizontal heat seal portion by the horizontal heat seal means 10. Thereafter, the horizontal heat seal bars 11a, 11b return to the standby position in synchronization with the ironing plates 14a, 14b or after the ironing plates 14a, 14b retreat, and the package 25 is taken out.

The operation of the bag making, filling and packaging machine will be described with reference to an ironing routine shown in FIG. (1) First, the control routine is started and the ironing member 1
3. When the horizontal heat sealing means 10 and the feeding means 5 are in a non-operating state (the state shown in FIG. 2), the article to be packaged A is dropped through the dropping cylinder 1, and the article to be packaged A is placed in the tubular sheet 23. (Step 1, abbreviated as S1; the same applies hereinafter). (2) The servo motor 6 of the feeding means 5 rotates forward to feed the tubular sheet 23 (S2). (3) When the cylindrical sheet 23 is fed out by a length corresponding to the length of one package, the servomotor 6 stops (the state shown in FIG. 3, S3). (4) The ironing member 13, that is, a pair of ironing plates 14a,
14b starts moving in the operating position, that is, the direction in which the tubular sheet 23 is sandwiched (S4). (5) It is determined whether the limit switch 27 has been operated (S5). That is, it is determined whether or not the ironing plates 14a and 14b have advanced to a predetermined position without completely crushing the tubular sheet 23, and have moved to a position where the tubular sheet 23 is sandwiched with a slight gap 28 left. (6) When the limit switch 27 is turned on, it means that the ironing plates 14a and 14b have reached the predetermined positions. Therefore, the servo motor 6 is rotated in the reverse direction to perform the ironing operation (see FIG. 4). S6). Only the tubular sheet 23 is pulled back through a small gap between the pair of ironing plates 14a and 14b, and the packaged object A is
a and 14b and pressed down below the ironing plates 14a and 14b. (7) The step of performing the ironing operation, that is, the servo motor 6
Is determined in advance from the feeding amount of the cylindrical sheet 23 sent out by the feeding means 5 and the amount of the article to be packed, and the predetermined reverse feeding is performed. At this point, the reverse rotation of the servo motor 6 stops (S7). (8) With the ironing plates 14a, 14b in the operating position, the horizontal heat sealing means 10 operates to form the upper heat seal of the package 25 (the state shown in FIG. 5, S8). (9) When the upper heat seal of the package 25 is performed by the horizontal heat seal means 10, the ironing plates 14a and 14b return to their inoperative positions (S9). Thereafter, the process returns to the main routine, and preparations for manufacturing the next package are performed. (10) If the limit switch 27 does not operate and remains in the OFF state, it is determined that the packaged object A is sandwiched in the gap 28 of the tubular sheet 23, and the process proceeds to step S9, where the ironing is performed. To stop the operation, the ironing plate 14
a, 14b are returned to the inoperative position.

Therefore, gas components such as air in the tubular sheet 23 escape above the tubular sheet 23 to reduce the space occupied by gas other than the packaged object A, thereby increasing the degree of filling of the packaged object A. A tight package 27 can be formed. In the example of creating the tight package 25, the compensation feed amount by the feed unit 5 is determined as an amount that minimizes the space occupied by air or the like above the packaged object A in the package 25. When the tubular sheet 23 is fed backward, the web-shaped packaging material 22 folded into a tubular shape returns to protrude upward from the tubular former 2 in the case of a relatively hard packaging material (the imaginary line in FIG. 1). In the case of a relatively soft packaging material, the dancer roller 18 descends by smoothly returning the cylindrical former 2 (see the phantom line 3 in FIG. 1).
6 (see state 6). The excess cylindrical sheet generated by the ironing is simply returned by the reverse feeding by the feeding means 5, and is used as a part of the packaging material in the next packaging cycle.

In step S8, the portion of the cylindrical sheet 23 to be heat-sealed is a portion squeezed by the ironing plates 14a and 14b, and there is no object A to be wrapped. It does not bite the object A. Since the ironing plates 14a and 14b are in the ironing operation position, the upper part of the package body 25 immediately before completion does not spread laterally, and the state in which the article to be packaged A is tightly packed in the tubular sheet 23 is maintained. I have. In this state, the flatly crushed tubular sheet 23 is heat-sealed, so that the operation of the horizontal heat seal means 10 is ensured.

FIGS. 7 and 8 show an example in which the compensation feeding of the tubular sheet 23 is performed in another mode. That is, FIG.
FIG. 8 shows a main part of another embodiment of a bag making and filling and packing machine for performing compensatory feeding according to the present invention. FIG. 8 shows a bag forming and packing machine formed by the bag making and filling and packing machine shown in FIG. A comfortable gusseted (square bottom) package 31 having a gusset fold 34 with a bottom folded in is shown. In order to fold the tubular sheet 23 from the side, a pair of left and right gusset folding members 29 are provided as folding members. The gusset folding member 29 has a pair of gusset folding tools 30a and 30b, each of which has a pointed triangular tip and is provided so as to be able to advance and retreat so as to be pushed into the tubular sheet 23 immediately above the horizontal heat sealing means 10. I have. With the gusset folding tools 30a and 30b pressed into the tubular sheet 23, the tubular heat sealing bar 11a (11b) of the transverse heat sealing means 10 causes the tubular sheet 2 to move.
When the horizontal seal is applied by sandwiching 3, the bag bottom in which the gusset is folded is formed. In addition, the cylindrical sheet 2
3, a vertical heat seal portion 32 and a horizontal heat seal portion 33 are formed by the vertical heat seal portion 3 and the horizontal heat seal portion 10 in the same manner as the vertical heat seal portion 24 and the horizontal heat seal portion 26.

As the gusset is folded, the cylindrical sheet 23
May be wrinkled or damaged in the bag due to the tension, but in this bag making and filling machine, the feeding means is synchronized with the pushing of the gusset folding tools 30a and 30b into the tubular sheet 23. Then, the servo motor 6 is rotated forward to feed the tubular sheet 23 in order. Therefore, the tubular sheet 23 does not become pulled due to the folding of the gusset, and the package does not become defective.

[0030]

Since the present invention is configured as described above, it has the following effects. That is, the bag making, filling and packaging machine according to the present invention uses a servo motor for feeding a tubular sheet according to the filling amount of an article to be packaged and for compensating feeding of the tubular sheet before and after that in order to correspond to the form of the package. By doing so, it becomes possible to accurately feed the tubular sheet in order or reversely according to the form of the package. According to the bag making, filling and packaging machine of the present invention, when the filled tubular sheet is stiffened, the tubular sheet is reversely fed as a compensating feed while the squeezing member is held at the operating position, so that it can be easily tightened. A simple package can be formed. In this case, it is not necessary to cause the ironing member to perform box motion, and it is only necessary to control the servomotor electrically and electronically, so that high-speed operation is possible. Further, the mechanism for ironing is simplified, and there is no interference with other mechanisms such as the horizontal sealing means and the cutter means. Further, since the operation of the servomotor can be accurately controlled, the compensation feed, that is, the ironing size becomes constant, and the setting of the ironing size can be flexibly changed according to the specification of the package.

Further, regarding the formation of a gusset-equipped package which can improve the degree of filling of the package with the object to be packaged and stabilize the display and storage, the tubular sheet is folded before filling and the gusset is provided at the bottom. By sequentially feeding the tubular sheet at the timing of the folding operation to be formed, the state of pulling the tubular sheet at the time of folding forming can be avoided, and a gusseted package without wrinkles or scratches can be formed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a bag making, filling and packaging machine according to the present invention.

FIG. 2 is an explanatory diagram showing an initial state of a packaging process involving an ironing operation using the bag making and filling and packaging machine shown in FIG. 1;

FIG. 3 is an explanatory view showing a state in which the tubular sheet filled with the articles to be packaged has been fed by a predetermined feed amount according to the filling amount, following FIG. 2;

FIG. 4 is an explanatory diagram showing a state where an ironing operation is being performed, following FIG. 3;

FIG. 5 is an explanatory diagram showing a state in which a horizontal heat sealing operation is being performed, following FIG. 4;

FIG. 6 is a flowchart showing a packaging step including an ironing step in the bag making and filling machine shown in FIG. 1;

FIG. 7 is a front view showing another embodiment of the bag making, filling and packaging machine according to the present invention.

FIG. 8 is a perspective view of a package formed by the bag making and filling machine shown in FIG. 7;

FIG. 9 is a partial side view illustrating a state before the ironing operation is started in the conventional bag making and filling machine.

10 is a partial side view illustrating a state where the ironing operation in the bag making and filling and packaging machine shown in FIG. 9 is completed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 dropping cylinder 2 cylinder former 3 vertical heat seal means 4a, 4b vertical heat seal bar 5 feed means 6 servo motor 9 feed belt (tamming belt) 10 horizontal heat seal means 11a, 11b horizontal heat seal bar 12 cutter 13 ironing Members 14a, 14b Ironing plate 18 Dancer roller 22 Web-like packaging material 23 Cylindrical sheet 25 Packaging (tight packaging) 27 Limit switch 29 Gazette folding member 30a, 30b Gazette folding tool 31 Packaging (packaging with gazette) 34 Gazette Folding part

Claims (4)

[Claims] 1. A dropping cylinder for dropping an article to be packaged, feeding means for sending out a tubular sheet along the dropping cylinder, and the article to be packaged dropped through the dropping cylinder to the tubular sheet Transverse sealing means for laterally sealing the tubular sheet to form a sealed package therein, wherein the feed means is driven by a servomotor and the servomotor and is associated with the tubular sheet. And a feed member to be combined,
The feeding amount of the tubular sheet by the feeding means compensates for a feeding amount predetermined according to the filling amount of the packaged object and a supply length of the tubular sheet to correspond to the form of the package. And a compensating feed amount. 2. An ironing member pressed against the tubular sheet is provided at a position below the lateral sealing means, and the compensating feed amount is determined by the ironing of the tubular sheet by the ironing member and the ironing. The reverse feed amount is a reverse feed amount for reverse feeding the cylindrical sheet filled with the article to be packaged in a state where the ironing member is sandwiched in order to absorb generated excess of the cylindrical sheet. Item 7. A bag making, filling and packaging machine according to Item 1. 3. A folding member for folding the tubular sheet from the side at a position above the lateral sealing means, wherein the compensation feed amount is determined by the cylindrical shape when the tubular sheet is folded from the side. 2. The bag making and filling and packaging machine according to claim 1, wherein the amount of the progressive feeding of the tubular sheet is reduced in accordance with the folding of the tubular sheet by the folding member in order to reduce the tension of the sheet. 4. The feed member according to claim 1, wherein the feed member is a feed belt or a feed roller that sandwiches the tubular sheet between the dropping tubular body and is driven by the servomotor. 2. The bag making, filling and packaging machine according to claim 1.