JPS63232106A - Packaging method and device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is a technical field in which various block-shaped frozen foods and snack foods are sealed and packaged in flexible bags formed from film-like sheets such as polyethylene. belongs to

<Summary of the gist> The invention of this application continuously pulls out sheets from a film-like sheet roll of a predetermined size mounted on the rear part of the frame, and then pulls out the sheets continuously through a former provided above the front part of the frame. Then, the longitudinal edges of the cylindrical sheet are vertically sealed by heat welding, and then the product is introduced from above, the product is horizontally sealed, and the product is cut horizontally. This invention relates to a packaging method and a packaging device directly used in the method, and in particular, a feeding device such as a roller that rotates at a constant speed on both sides of a cylindrical sheet formed by a sheet fed into a former. The cylindrical sheet is continuously fed at a constant speed, and the cylindrical sheet being fed at a constant speed is vertically sealed by performing downward circulation in the vertical direction at the same speed as the cylindrical sheet, A packaging in which the cylindrical sheet is fed at the same speed as the descending cylindrical sheet at the bottom, and the cylindrical sheet is lowered at the same constant speed while the cylindrical sheet is cut horizontally to perform horizontal sealing that circulates in the vertical direction. This invention relates to a method and an apparatus.

<Prior art> As is well known, as the lives of citizens have improved and their activities have become more diverse, various forms of consumer life have taken on various forms. Among them, instant foods, frozen foods, and even snack products have come to be distributed in a wide variety of ways. Packed products packed in flexible bags made of resin such as polyethylene have become widely traded due to the advantages of unit weight and quantity transactions. The products come in a variety of forms, from loose items in the form of blocks to solid products, but in order to ensure ease of handling and accurate transactions, the products are weighed at set weights and packaged using continuous packaging means for distribution. These formats have become established, and various research and improvements have been made to these technologies.

In general, the packaging device continuously pulls out sheets from a film-like sheet roll of polyethylene or the like mounted at the rear of the frame, forms them into cylindrical sheets using a so-called former, and weighs them from above through a chute. The so-called vertical packaging method is widely used, in which the product is placed in the package, vertically sealed, then horizontally sealed, and then laterally cut with a cutter to package the product.

<Problems to be Solved by the Invention> However, in the conventional packaging technology, as described above, as a cylindrical sheet is formed using a film-like feeding sheet, weighed products are introduced from above in the previous stage. Since the sheet falls by gravity, vertical sealing is performed on both edges in the vertical feeding process of the sheet, and horizontal sealing is performed to form unit packs. Due to the constraints of unit formation, it is generally necessary to cut the sheet intermittently from the sealing process to the cutting process. A feeding system was adopted, in which electric seals and horizontal seals were performed when the machine stopped for a set time, and products were loaded during the vertical movement between the next vertical seal and horizontal seal.

Therefore, a large acceleration acts on the vertically fed sheet when it starts up after the vertical seal and the horizontal seal, and a large inertial force acts when the vertical seal and the horizontal seal stop, and the impact load of the product introduced from above is applied. This has the drawback that it is difficult to maintain the seal portion, and in extreme cases, the seal portion may be damaged.

Furthermore, since the feeding tension for the sheet differs between sealing and feeding, it is difficult to balance the load in each drive section and adjust the pull-down force, feed-out force, etc. This has the disadvantage that the structure has to be extremely complicated and the control is complicated, resulting in high costs.

Another disadvantage is that running costs increase due to the hassle of maintenance, inspection, maintenance, and management.

To deal with this, for example, as seen in the invention disclosed in Japanese Patent Publication No. 59-3325, a technique has been developed in which a so-called endless drive type circulating vertical seal or circulating horizontal seal is performed at the lower part of the former. Due to the structure, it is difficult to control the temperature and horizontal cutting of the vertical seals and horizontal seals of chain drives and belt drives, and the structure tends to be extremely complex, with the disadvantage that the time control is also extremely complicated. .

<Object of the Invention> The object of the invention of this application is to achieve the advantages of intermittent thermal welding and transverse cutting for longitudinal sealing and transverse sealing while continuously feeding a sheet from a film-like sheet roll based on the above-mentioned prior art. In addition, the sheet is always fed at a constant speed from the former to the cross-cutting in the same way as from the sheet roll, which is optimal for thermal welding of the sheet, cross-cutting, and feeding the product from the upper chute. This enables sheet feeding to be carried out smoothly, without straining the sheet feeding, and without causing any unexpected troubles.
It is an object of the present invention to provide an excellent packaging method and device that can carry out packaging most efficiently and continuously while maintaining extremely natural feeding and product filling conditions, thereby benefiting the field of product processing technology used in the distribution industry.

<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of the invention of this application, which is summarized in the above-mentioned claims, is mounted on the rear part of the frame of the packaging device. A sheet from a film-like sheet roll of a predetermined size is given a predetermined tensile force by the rollers of a pair of feeders at the bottom of the former provided at the front of the device, and is also given a feed force so that it is always kept at an even rate. Rapid feeding is performed, and a cylindrical sheet is formed as set by the former at the top of the device, and is lowered by the feeding device.The sheet is then lowered at a constant speed by the feeding device, which rotates by vertical pressing force on both sides of the cylindrical portion, and the sheet is lowered. In the process, the vertical seal follows a circulation path in the vertical plane through a cam, crank mechanism, etc. at the bottom of the former, descends at a uniform circumferential speed relative to the cylindrical sheet that descends at a constant speed, and returns rapidly. A thermal welding vertical seal is applied at the bottom of the seal, and a pair of sealing arms (front and rear) are lowered at a circumferential speed under the cylindrical sheath, which is lowered at a constant speed through a circulating device that circulates on a vertical plane. The product is horizontally sealed while circulating upward, and a cutter installed in the horizontal seal cuts the product horizontally.At this time, the product is weighed to a predetermined set weight from the previous stage through a chute installed at the top of the vertical seal. etc., and the next cycle of horizontal sealing and horizontal cutting of the cylindrical sheet, which descends at a constant speed, packs the products unit by unit and cuts the bag into units. During this time, the vertical plane against the horizontal seal is The circulating device that performs circulation expands and contracts the front horizontal seal, and the ram plate that integrates these can circulate downward at the same speed as the cylindrical sheet, which is always lowered at a constant speed via a gas oil damper etc. The feeding of the cylindrical sheet is guaranteed to be at a constant speed throughout the entire process from feeding to cross-cutting, avoiding unexpected troubles such as impacts from dropped products, and performing vertical sealing, horizontal sealing, and cross-cutting at the optimal timing. This technology has been implemented to increase the reliability of the product and to prevent a decrease in yield.

<Example> Next, an example of the invention of this application will be described below with reference to the drawings.

The illustrated embodiment is a mode in which loose products such as snack products are weighed by a preset weight through a pre-stage weighing device (not shown) and packaged in flexible polyethylene bags for continuous processing. The packaging device is one of the central points of the invention, and in FIG. 1, only the main parts are schematically shown to avoid complication in representing the whole.

It is connected to a discharge hopper of a weighing device (not shown) through a cone-shaped chute 3 provided at the top of the frame 2, and is equipped with a power source, a control device 4, and a computer 5, and is replaceable at the rear. A weighed product 8 of a predetermined weight, which is discharged from above through a chute 3 in a preset cycle, is fed by a sheet 7 from a polyethylene film sheet roll 6 of a predetermined size, and is stored and heated. Welded and sealed rectangular bag of set size 9
It is designed to be formed and discharged.

The sheet roll 6 is replaceably attached to the shaft 10 by a clamping device 11, and the powder brake 12
This is to avoid overrun, and rotational force is applied by a predetermined torque from a motor 14 via a transmission device 13, a timing pulley, and a belt.

Thus, the sheet 7 from the sheet roll 6 is transferred to the tension roller 15, the idle roller 16, and the guide roller 17.1.
7... and is formed into a cylindrical sheet 21 by a former 20 provided at the lower part of the chute 3 via check rolls 19 and the like in the conventional manner, and is fed down to form a vertical sealing device 22. and then the feeder 23
The packaging bag 9 is obtained by passing through a continuous constant-speed rotating body forming a transverse sealing device 24 for packaging, thermal welding, and transverse cutting.

A drive device 25 is installed on the rear side of the frame 2 in FIG. 1 and is electrically connected to a power distributor 26 at the bottom via cables and lead wires (not shown).

In the vertical sealing device 27, as shown in Fig. 1.2.6, the timing pulley 28 of the output shaft of the motor 27, which is installed on the frame 2 via a predetermined bracket, and the horizontal A timing belt 30 is stretched between the pivotally supported shaft 29 and a timing pulley, and an eccentric cam 33 is rotatably supported and connected to the base of a link 32 forming a swinging device via a transmission 31. A link 32 whose base is similarly supported on the frame 2 by a pin together with the tip of a link 32' is pivotally supported via a shaft 29'.
' to form a four-point link, and as shown in FIG. link 32
A rod 35 in the front-rear direction is inserted through the upper part of each of ', 32', and a spring-type pressing force adjustment device 36 is provided on the base side thereof, and a horizontal parr 37 is provided at the tip. A vertical sealing device main body 38 is provided on the back side of the center part of the main body 38, which has a built-in heater (not shown) and is electrically connected to the power distributor 26. ' , and eccentric cam 33
As shown in FIG. 2, the circulation cycle of vertical planes a, b, c, and d is drawn by the design, and as shown in FIG. The link 32 is thermally welded to both overlapping edges.
．． 32', 32', and the eccentric cam 33, as shown in FIG. 6, the lowering speed for thermal welding is set to the same speed as the lowering speed 21' of the cylindrical sheet, and the same speed as the speed at which the cylindrical sheet is fed and lowered at a constant speed. The speed of separation from the cylindrical sheet 21 from C to d and the speed of approaching from a to b are approximately the circumferential speed, and the speed from d to a in the repositioning process which circulates and rises. The speed is such that it is faster than the descending speed, and these mechanical designs can be easily developed by those skilled in the art as mere design considerations.

Further, the vertical sealing device main body 38 is similarly designed so that its lower end approaches the cylindrical sheet 21 first, and then the upper end approaches the cylindrical sheet 21 after a predetermined minute time. The pressing force against the cylindrical sheet 21 can be adjusted to a predetermined optimal pressing force in advance or during operation using a pressing force adjusting device 36 at the rear.

These mechanisms constitute a circulating device 34.

Further, as shown in FIG. 7, the feeding device 23 for the cylindrical sheet 21 is placed in a horizontal position parallel to the shaft 29 with respect to another shaft 39 which is rotatably supported via a bearing (not shown) of the frame 2. Timing pulley 40.4
0' and the timing belt 41, and the bevel gears 42 and 42 fixed to both ends of the shaft 39 extend perpendicularly to the shaft 39 and are connected to bearings (not shown) provided on the frame 2. The rotational force is transmitted to each rotatably supported shaft 43 via the
As shown in FIG. 11, the timing pulley 44 installed in each cover arm 44 tilts toward the cylindrical seat 21 during driving, and separates from the set angle by a degree as shown by the dotted line during initial preparation and adjustment. ' The timing belt 45 is adjusted between the timing pulley 44' and the timing belt 44'.
The driving force is transmitted to a wheel 47 at the tip of a shaft 46, and a feed roller 48, which is a continuous constant-speed rotating body made of rubber, is transmitted to the wheel 47 through a predetermined well-known mechanism that rotates in case of overtorque. Therefore, as shown in FIG. 2, at a predetermined distance below the vertical sealing device main body 38, a pair of cylinders 39 are provided on both sides of the vertical sealing device main body 38 with respect to the cylindrical sheet 21. feeding rollers 48, 48 are provided which rotate in opposite directions at a constant speed to move the cylindrical sheet 21 down in equal continuous feeding as shown in FIG. A predetermined tension is applied to the sheet 7 by the feeding speed of the motor 14 relative to the sheet 7.
It is designed to provide a kind of tension feeding while giving

As shown in FIG. 7.11, during initial preparation and adjustment, the cover arms 44 are opened to both sides and the feed rolls 48.
48 can be moved away from the cylindrical sheet 21, and the cylindrical sheet 21 can be manually pulled and adjusted, but when in operation, the cover arm 44 is tilted inward, and each feed roller 48 moves away from the cylindrical sheet 21. 21 and act to forcibly pull and feed the cylindrical sheet 21 downward, each cover arm 44 is never in an open position in the detachment direction.

The horizontal sealing device 24 provided at a predetermined distance below the feeding device 23 is connected to the third and ninth sealing devices provided on the back side of the frame 2.
It is connected to another circulating device 49 shown in the figure as described below.

As shown in FIG. 9, the orbiting device 49 is a ram plate (50) made of cast metal such as aluminum and having a substantially pentagonal shape in plan view.
is the 10th on both sides of the parallel part on the side of the horizontal sealing device 24.
A pair of guide bars 51.51 with a square cross section as shown in the figure.
As shown in FIG. 10, rotatable guide rollers 52 and 52 are inserted into the guide bar 51 so as to be slidable in the vertical direction, and are in contact with the four sides of each guide bar 51 at the upper and lower portions of the insertion portion, respectively, as shown in FIG. ... so that it moves up and down smoothly.

Therefore, the ram plate 50 is supported at its base by a set of cantilevers on a pair of guide bars 51, 51 via rollers 52, 52, etc., and is designed to be raised and lowered in a stable posture. There is.

A rack 54 is engraved on the lifting bar 53 whose upper end is fixed on the back surface between the guide bars 51 and 51 of the ram plate 50 and extends downward, and the rack 54 is connected to the output shaft of the motor 55 installed on the frame 2. It meshes with a provided pinion 56, and the lower end of the lift bar 53 is connected to a rod of an air cylinder 57 as a shock absorber.

The air cylinder 57 is connected to an accumulator 58 to correct the unbalance between the speeds of the ram plate 50 when it descends and when it ascends, thereby functioning as a kind of air damper.
The ram plate 50 is operated to move up and down at a constant speed by switching control of the motor 55 via the control device 4.

The motor 5 is mounted horizontally at the rear end of the ram plate 50.
9 is fixedly installed, and as shown in Fig. 3.4, a lever 60 provided on its output shaft is connected to another lever 60' via a pin pivot at its tip, as shown in Fig. 9. Similarly, an air damper as a shock absorbing device is provided via a link 60' to a slider 63 which is provided in a long slide groove 61 extending through the upper and lower surfaces of the ram plate 50 so as to be movable back and forth via a roller 62. is connected to an air cylinder 64.

As shown in Fig. 3.9, the slider 63 is inserted into the front part through a loose insertion hole provided in the ram plate 50, and is further inserted loosely into a hole in the frame to form a pair of lateral sealing devices. The horizontal seal bodies 6 are connected to the center of a pair of horizontal seal bodies 66 and rotated by a motor 59.
6 can be freely moved forward and backward within a predetermined span.

Further, a lever 68 is rotatably supported on each of a pair of pins 67 and 67 provided near the rear of the ram plate 50, and the inner end thereof is pivotally connected to the slider 63 through a long groove and a pin. At the same time, the outer end is pivotally supported by the rear end of the link 69 via a pin pivot, and the tip of the link 69 is moved forward and backward by loosely inserting a sleeve 70 fixed to the frame 2 in the front and back direction. A pin is supported by a pin on the rear end of a rod 71 that slides freely, and each rod 71 is connected to the rear horizontal seal body 6.
6 is inserted loosely at its end, and its tip is connected to the horizontal seal body 66.
It is connected to the end of another horizontal seal main body 72 horizontally installed parallel to the main body 72 by a screw mechanism or the like (not shown) so as to be able to adjust its longitudinal position.

Therefore, the rod 71 is movable back and forth with a phase opposite to that of the rod 65 by 180 degrees, so that the pair of horizontal seal bodies 66 and 72 can be expanded and contracted with the cylindrical sheet in between, and when they are in close proximity to each other, the cylindrical The shaped sheets 21 are interposed and thermally welded by a heater (not shown) installed inside each other to form a lateral seal.

Further, an air cylinder 73 is provided at the front of the front horizontal seal body 72, and as shown in FIG.
4. A cylindrical sheet that can be freely moved in and out of a horizontal slit (not shown) in the horizontal seal body 66 by using a horizontally placed cutter 75 installed therein through the 74, and can be moved left and right, and is laterally sealed by heat welding. A transverse cut is made for 21.

Therefore, by raising and lowering the ram plate 50 by the motor 55, pinion 56, and rack 54 and by moving the slider 63 back and forth by the rotation of the motor 59, the horizontal sealing device 24 is moved by the rotation device 49 into the vertical plane in the shape of an opening shown at the right end of FIG. Moreover, by design, the descending speed is the same as the descending speed of the cylindrical sheet 21 by the feed roller 48, so that the cylindrical sheet 21 always descends at the circumferential speed. At the same time, transverse sealing and transverse cutting are performed.

Note that the operation timing of the air cylinder 73 is electrically controlled by a control device @4.

As described above, the left and right pairs of rods 35 and 71 of the vertical sealing device 23 and the horizontal sealing device 24 are attached to the frame 2 in order to perform the circulation process in the vertical plane of the mouth shape. As shown in FIG.
．． 71 is adapted to allow vertical opening-shaped circulation operation.

In addition, in FIG. 12, 78, 77' are the insertion holes for the shafts 43, 43 in FIG. 7 and the rod 65 in FIG. 8.

In addition, in FIG. 1, when the feed device 23 and the horizontal seal device 24 are opened, an appropriate electromagnetic vibration device 79 is provided on the rear side of the frame 2, and a suitable electromagnetic vibration device 79 is provided at the tip of the rod into which the frame 2 is loosely inserted. A vibrator 80 that applies a predetermined vibration is installed on the back side of the cylindrical sheet 21 whose lower part is horizontally sealed. When applying the so-called shaking 7S to the next upper horizontal seal and cross cutting, the horizontal seal main body 66,
It is made such that there is no situation where the product is inserted between and 72.

Further, in FIG. 9, reference numeral 81 denotes an oil-adjustable air damper, which is connected to the air cylinder 64 of the ram plate 50 and is connected to the front side of the lateral seal body 66 at the rear of the lateral sealing device 24 during lateral sealing. The pressing force of the sealing device main body 72 against which cylindrical sheet 21 can be electrically and automatically adjusted.

In the packaging device 1 having the above-mentioned configuration, when the products 8 are weighed by a set weight using a measuring device (not shown) connected to the upper part and are then wrapped using the sheet 7 and successively packaged in the packaging bag 9, it is necessary to A sheet roll 6 of a set size is wound around a shaft 10 in a predetermined manner via a clamp device 11 and mounted thereon.

Although not shown, bearings on both sides of the shaft 10 on which the sheet roll 6 is wound are automatically moved left and right by a ball screw, a gear device, etc. (not shown), and the sheet roll 6 and the sheet are Lateral movement at the base of 7 allows for positioning adjustment with respect to the FO and -MER 20.

Therefore, the pair of feed rolls 48, 48 of the feed device 23 are opened to the outside in the shape V shown by the dotted line in FIG.
Manually tighten tension roller 15 and idle roller 1.
6. Guide roller 17.17..., check roll 1
9 etc., and then guide the former 20 through the cylinder 39 to form the cylindrical sheet 21 and lower it, pass through the rear part of the vertical sealing device main body 38 in a predetermined separated attitude, and separate and open the pair. It is passed between the feeding rolls 48, 48 of the lateral sealing device 24 and then between the lateral sealing device main bodies 66. Cover arm 44
．． 44 is placed in a closed position facing inward as shown by the solid line in FIG. 11, and the start button of the control device 4 is pressed to start the packaging operation.

The operation and control of each mechanical section is automatically performed via the control device 4 according to a program input into the computer 5 in advance.

Thus, the sheet 7 from the sheet roll 6 is sent out through the rotation of the shaft 1o by the motor 14, and the sheet 7 is sent out through the rotation of the motor 27 to the feeding device 23 shown in FIG.
starts, and each wheel 47 constantly rotates at the set speed via the timing pulleys 4o, 40', timing belt 41, bevel gears 42, 42, timing pulleys 44, 44', and timing belt 45. The former is rotated inwardly by the rolls 48.
The sheet 7 formed into a cylindrical sheet 21 by the cylindrical sheet 20 is constantly fed downward at a constant speed, and the tension of the cylindrical sheet 21 during this time is controlled by the feed rolls 48 of the feeding device 23,
The rotation of the sheet roll 6 by the motor 14 always maintains a constant state.

Even if overtorque is unexpectedly applied to the feed roll 48 in the feed device 23, slippage occurs between the wheel 47 and the feed roll 48, so that the cylindrical sheet 21 is not forced. Safety is guaranteed in that no tensile force is applied and no breakage occurs.

The cylindrical sheet 21 is continuously lowered from the former 20 at a constant speed, and the power from the motor 27 is applied to each eccentric cam 33, link 32, . 32' and 32', the vertical sealing device body 38 moves through the rod 35 at the same descending speed 21' as the descending cylindrical sheet 21, as shown in FIG.
As it descends from C to C, it is energized by the power distributor 26 and thermally welded by a built-in heater (not shown) to form a vertical seal, and then moves away from C to d with a predetermined stroke, and from the descending speed shown in Fig. 6. It rises from d to a at a fast rising speed, and then approaches the overlapping part of both edges of the cylindrical sheet 21 at a speed of a to b to complete one cycle. The lower side of the sealing device main body 38 comes into close contact with the cylindrical sheet 21 slightly quickly, and the upper part comes into close contact with a slight delay, thereby performing thermal welding smoothly.

Therefore, while the cylindrical sheet 21 continues to be lowered by being fed at a constant speed, the vertical sealing by the vertical sealing device 22 is smoothly performed through a circular process in the shape of an opening in the vertical plane.

Of course, by design, the upper and lower ends of one cycle of the thermally welded portion of the vertical seal to the cylindrical sheet 21 are slightly overlapped by a predetermined amount to prevent an unwelded portion from occurring.

The vertically sealed cylindrical sheet 21 is transferred to the feed roll 4 of the continuous constant speed rotating body of the feed device 23 at the lower part of the cylindrical sheet 21.
Due to the pressing action of the cylindrical sheet 21 against the cylinder 39 at 8.48, it is lowered in a vertically sealed state, and is fed between the horizontal seal bodies 66 and 72 before and after the horizontal sealing device 24, and then In the horizontal sealing device 24, the lever 60, 60 is caused by the raising and lowering of the ram plate 50 via the pinion 56 and rack 54 by the motor 55, and by the rotation of the motor 59 provided at the rear end of the ram plate 50.
' through the air cylinder 64, the link 60' through the back and forth movement of the slider 63 along the slide groove 61, the rear transverse sealing device main body 66, and the link 68 which pivots around each pin 67. Link 60. Due to the expansion and contraction of the front horizontal seal device main body 72 through the 180' phase difference caused by the back and forth movement of the rod 71, the horizontal seal device 24 expands and contracts as it moves up and down, and performs a mouth-shaped circulation action in the vertical plane. , the lowering speed is the same as the lowering speed of the constant-speed feeding of the cylindrical sheet 21, so that the sheets are thermally welded by the built-in heaters to each other via the control device 4 in the close retracted position to perform lateral sealing, At the same time, the shutter of the collecting hopper of the upper weighing device (not shown) is opened via the control device 4, and the product 8 is thrown into the upper cylindrical sheet 21 which is laterally sealed via the chute 3 and the cylinder 39.

And, the advance and retreat movements of Londro 5 and 71.71 are linked by link 6.
Since the phase is reversed by 180 degrees through
The welding is carried out at the same speed and in the same posture plane-symmetrically with respect to 1, so there is no possibility that the thermal welding of the horizontal seals will be misaligned.

As described above, since the cylindrical sheet 21 continuously and steadily descends at a constant speed, the relative speed with respect to the product 8 being thrown in is reduced, and therefore, the cylindrical sheet 21 due to the feeding of the product 8, The impact on the lateral seal portion is weakened, and troubles such as breakage do not occur.

Immediately before the front and rear horizontal sealing device bodies 66 and 72 are separated after heat welding, the air cylinder 73 is activated, and the cutter 75 protrudes through the link 74 and slides horizontally to cross-cut the heat-welded cylindrical sheet. There, a bag 9 is formed with the transversely cut cylindrical sheet 21 at the lower part and is dropped and released, and the cylindrical sheet 2 at the upper part continues to descend at a constant speed.
1, the vibrator 80 of the electromagnetic vibration device 79 applies shaking from the back side of the cylindrical sheet to sufficiently store the product in the horizontally sealed upper cylindrical sheet 21, and perform the front and rear horizontal seals for the next horizontal seal. The product 8 is prevented from intervening between the device bodies 66 and 72, and then the product 8 is returned to its position, and the horizontal seal device bodies 66 and 72 that are close to each other perform thermal welding again to perform horizontal sealing and horizontal cutting in sequence, and this cycle is completed. repeat.

During this time, each rod 35 of the vertical seal device @ 23 and each rod 71, 71 of the horizontal seal device 24 that move up and down relative to the frame 2 are operated by the long grooves 76, 76, 77 shown in FIG.
．． 77' is well tolerated.

Further, the ram plate 50 is moved up and down smoothly by the upper and lower rollers 52 on each side of the guide rod 51, 51 having a rectangular cross section, and no rattling occurs.

The pressing force of the horizontal sealing device body 66, 72 during thermal welding, which performs important horizontal sealing, is adjusted in advance by the pressing force of the air cylinder 64 by the air damper 81 using well-known electric pressure conversion, and the vertical sealing The pressing force of the vertical sealing device main body 38 against the cylinder 39 is similarly adjusted to a preset pressing force by a pressing force adjusting device 36 at the rear of the rod 35.

The balance of the lifting speed due to the acceleration of gravity when the ram plate 50 is lowered is sufficiently damped by the damper action of the compressed air pressure accumulator 58 of the air cylinder 57 provided at the lower part of the lifting rod 53. As designed, the elevator moves at a constant speed.

The feeding tension of the sheet 7 is automatically adjusted by the action of the tension roller 15, the action of the powder brake 12, and the action of the motor 14.27, so that the feeding action is always performed in a constant tensioned state.

In this way, it is made a priority condition that the downward feeding of the sheet 7 from the sheet roll 6 from the former 20 to the horizontal sealing device 24 is always carried out continuously at a constant speed, and following this, vertical sealing is performed. Since the heat welding of the vertical seal and the horizontal seal of the device 23 and the horizontal sealing device 24 is performed between the speed of the descending cylindrical sheet 21 and the constant speed feeding of the circumferential speed, no acceleration occurs when stopping or starting up. Therefore, unreasonable stress is not applied to the thermally welded part, and unexpected situations such as breakage and cracks are prevented.Furthermore, the relative speed at which the product 8 is charged from the upper chute 3 immediately after horizontal sealing is reduced. As described above, the impact force due to the acceleration due to charging is also weakened, and no damage to the heat-welded parts occurs, and continuous loading and packaging can be carried out smoothly.

Incidentally, it goes without saying that the actual embodiment of the invention of this application is not limited to the above-mentioned embodiments; for example, as a sealing device, a mode of sealing using ultrasonic waves or high sonic waves can be adopted; The cover arm of the feed roll can be switched using a solenoid-type automatic switching device via the dead center, or
Various modes can be adopted, such as timing control and speed control using eye marks printed in advance on the edge of the sheet of the sheet roll.

In addition, changes to the design include, for example, changing the rack and pinion of the elevating rondo to helical gears, replacing the air damper with a shock absorbing device such as a gas-oil damper, and even turning the entire device on its back so that it can be used as a horizontal packaging machine. Of course, it is also possible to do so.

It goes without saying that the target packaging sheet may be a sheet other than polyethylene, and that the present invention can also be applied to products other than snack products.

<Effects of the Invention> As described above, according to the invention of this application, basically the work of vertically and horizontally sealing a cylindrical sheet through a former made of polyethylene sheets, etc., and then inserting and packaging the product. First, the cylindrical sheet that is lowered from the former to the horizontal seal via the vertical seal is continuously fed down at a constant speed, and both the vertical seal and the horizontal seal, and therefore the horizontal cutting, are always fed at a constant speed. In order to carry out vertical sealing, horizontal sealing, and horizontal cutting by descending uniformly at the same speed in synchronization with the descending cylindrical sheet, the cylindrical sheet is relatively weak in strength, especially the part that is heat welded. No unnecessary applied loads are applied to the weak parts of the machine when it stops or starts up, so there is no risk of cracks or damage, and this has the excellent effect of increasing product reliability and improving product yield. Qin will be conquered.

In particular, for vertical seals with long thermal welding spans, the descending speed is synchronized with the descending uniform speed of the thermal welding, but the process of rising and returning to the position is rapid, and this is also done with a relatively lightweight vertical sealing device. Therefore, no strain is placed on the mechanism, and therefore, the cycle operation can be performed quickly and smoothly.

In addition, since neither the vertical sealing device nor the horizontal sealing device is the conventional endless type, the structure is simple, and the heat management of the built-in heaters of the vertical sealing device and horizontal sealing device is easy, and there are almost no bends or contact points, so there is no possibility of failure. Therefore, there is an advantage that maintenance such as maintenance, inspection, etc. can be reduced.

In the packaging device, the feeding rollers of the continuous constant speed rotating body on both sides of the cylindrical sheet of the feeding device forcefully rotate the cylindrical sheet from both sides, so that a kind of pull-down action is performed to move the cylindrical sheet. However, it can be forcibly lowered through the light friction of the surface contact, and there is also the effect that the cylindrical sheet does not break due to the tensile force of the surface contact.

In this way, according to the pre-programmed control, the lowering pulley of the cylindrical sheet is continuously fed at a constant speed, and the vertical seal and the horizontal seal are lowered accordingly, synchronized with the constant speed feeding of the cylindrical sheet. The first condition is to feed a weak sheet at a constant speed, in which transverse cutting is also carried out during the transverse sealing process, so that all movements are free from stress.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of one embodiment of the invention of this application, and the drawing is a first embodiment of the invention of this application.
The figure is a schematic partial perspective view of the entire device, Figure 2 is a schematic plan view of the vertical sealing device and its driving mechanism, Figure 3 is a schematic plan view of the horizontal sealing device and its driving mechanism, and Figure 4 is a schematic plan view of the horizontal sealing device and its driving mechanism. 5 is a schematic side view of the drive mechanism of the vertical sealing device, FIG. 6 is a vector graph of the speed of the descending cylindrical sheet and the vertical sealing device main body circulating in the vertical plane,
Fig. 7 is a schematic perspective view of the drive mechanism of the feeding device, Fig. 8 is a schematic perspective view of the drive mechanism of the horizontal sealing device, Fig. 9 is an enlarged schematic diagram of the main parts of the circulation mechanism of the structural sealing device, and Fig. 10 11 is a partial cross-sectional plan view of the guide rod of the ram plate, FIG. 11 is a schematic side view of the mechanism of the cover arm relative to the cylindrical seat of the feeding device, and FIG. 12 is a schematic front view of the frame. 2...Frame, 6...Sheet roll, 7...
・Sheet, 20... Former 121... Cylindrical sheet, 22... Vertical sealing device, 9... Ze (equipped product, 24... Horizontal sealing device, 23... Feeding device ,
48... Continuous constant speed rotating body, 34... Orbiting device,
1... Packaging device, 55... Lifting device, 59...
・Expansion/retraction device＼-1"r゛8.8 Foil 1"

Claims (13)

[Claims] (1) A sheet is sent out from a film-like sheet roll mounted on a frame, formed into a cylindrical sheet by a former, and then the edge of the sheet is vertically sealed, then horizontally sealed and laterally cut. In the packaging method, the cylindrical sheet is continuously fed at a constant speed from forming the cylindrical sheet by the former to lateral cutting, and the vertical sealing, lateral sealing, and lateral cutting of the cylindrical sheet are performed by feeding the cylindrical sheet. A packaging method characterized in that the packaging method is carried out in a uniform feeding state at the same speed. (2) The packaging method according to claim 1, characterized in that the time from the vertical seal to the next vertical seal is shorter than the time for the vertical seal. (3) The packaging method according to claim 1, characterized in that the pressing force applied to the sheet during the vertical sealing is applied from one end first. (4) The packaging method according to claim 1, characterized in that the time from one horizontal seal to the next horizontal seal is shorter than the time for the horizontal seal. (5) A horizontal sealing device in which a film sheet roll mounting device is provided on the frame, a former is provided upstream, a vertical sealing device is provided downstream of the former along with a feeding device, and a horizontal cutting device is further downstream of the vertical sealing device. is provided, and the central portion thereof is provided with these drive devices, the feeding device comprising continuous constant speed rotating bodies on both sides, while the vertical sealing device is linked to a circulating device circulating in a vertical plane,
Moreover, the continuous packaging device is characterized in that the horizontal sealing device is also linked to a circulating device that circulates in another vertical plane. (6) The continuous packaging device according to claim 5, wherein the continuous constant speed rotating body is a roller. (7) The continuous packaging device according to claim 5, wherein the continuous constant speed rotating body is switchable between a feeding position and a preparation position. (8) The continuous packaging device according to claim 5, wherein the circumferential device for the horizontal sealing device comprises an elevating device and a longitudinal expansion/contraction device integrally attached to the elevating device. (9) A horizontal sealing device having a film-like sheet roll mounting device installed on the frame, a former provided upstream, a vertical sealing device attached to a feeding device downstream of the former, and a horizontal cutting device further downstream. is provided, and the central portion thereof is provided with these drive devices, the feeding device comprising continuous constant speed rotating bodies on both sides, while the vertical sealing device is linked to a circulating device circulating in a vertical plane,
A continuous packaging device characterized in that the horizontal sealing device is also linked to a circulating device that circulates in another vertical plane, and the circulating device that circulates in the vertical plane has a buffer device. (10) The continuous packaging device according to claim 9, wherein the buffer device is attached to the back and forth movement of the lateral sealing device. (11) The continuous packaging device according to claim 9, wherein the buffer device is attached to the vertical movement of the lateral sealing device. (12) The continuous packaging device according to any one of claims 10 and 11, wherein the buffer device is an air damper. (13) The continuous packaging device according to any one of claims 10 and 11, wherein the buffer device is a gas-oil damper.