JPS643727B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD AND OBJECTIVES This invention relates to a packaging machine capable of wrapping articles with a packaging film.

It is an object of the present invention to provide a packaging film overlapping section of a packaging machine that can improve the adhesion of the overlapping section by jetting hot air to the overlapping section of the packaging film enclosing an article. The purpose of the present invention is to provide a sealing device.

Embodiment A packaging machine that performs a fully automatic packaging operation using a sealing device according to an embodiment of the present invention will be explained below as an example. As an example of the outline, a feed guide section A that holds and guides the starting end of the film fed out from two types of rolled film bodies F set at the rear of the machine body 1 in a predetermined position, and this guide. The film is pulled out from part A to the packaging part C side, stretched and set as a packaging film of a predetermined size, and then folded into the drawer/folding part B. The film is inserted while the packaging film is formed and held in a bag shape by suction action. The machine is equipped with a packaging section C that holds the packaged items and discharges them as packaged items to the opposite input side, and a transport section D that carries the packaged items out of the machine.For the purpose of explanation, each section will be described in detail.

Structure of Feeding Guide Section A First, in the feeding guide section A illustrated in FIGS. 4 and 5, two types of film are used in the switching mechanism 2 as a feeding device, as in the conventional case. A feeder 10 is provided. That is, regarding the switching mechanism 2, each large chain wheel 5 of the rotating shaft 4 supported between the base ends of a pair of support arms 3 installed on both sides of the fuselage 1, and each small chain wheel 5 pivotally supported at the tip of each arm 3. Two rows of chains 7 are hung between the wheel 6 and the chain wheel 8 at the end of the rotating shaft 4, and a chain 9 on the side of the double-acting switching means (not shown) is hung. As shown in Fig. 1, the switch can be operated clockwise or counterclockwise.

On the other hand, each group of feeders 10 has the same structure, and has a large-diameter upper roller 12 and a continuous uneven planar shape between the support plates 11 connected to the chain 7 on each side. A pin 14 and a spring 15 are connected to the support plate 11 on each side.
A small-diameter lower roller 17 and a guide plate 18 are respectively connected between a pair of movable arms 16 connected and supported by a pair of movable arms 16.
The film is fed and guided between the two guide plates 13 and 17 to prevent reverse removal, and the end of the film is bitten and held between the two guide plates 13 and 18. The feeders 10 have the same feed width and are aligned with each other at the same feed center, and the feeder 10 on the lower side of FIG. It is set in a standby position pointing toward the drawer 38.

Structure of drawer/folding section B Film drawer/folder illustrated in FIGS. 6 to 9
In the folding section B, a stretching device is provided above the body 1, and a folding device is provided below.

(Stretching device) First, regarding the stretching device, the reciprocating mechanism 19 is equipped with a puller 38, a rear gripper 47 is provided at the retreating end of the puller 38, and side grippers 57 are placed on both sides of the puller 38. It is set up. That is, the reciprocating mechanism 19 rotates around a rotary cylinder 21 on the main shaft 20 at the front of the fuselage 1.
Each chain wheel 22 at both ends and the slave shaft 2 at the rear of the fuselage 1
There are two rows of chains 2 between each rotating chain wheel 24 on 3.
5 is hung thereon, and the rotary cylinder 21 is connected to a transmission mechanism 26. In the transmission mechanism 26, as shown in FIGS. 6 and 8, the rod 2 is connected from the drive section side.
The first, second, and third gears 29, 30, and 31 are connected to the sector gear 28, which is rotated reciprocally over a predetermined angle range via the gear 7, and the third gear 31
A chain wheel 32 coaxial with the chain wheel 32 and a chain wheel 33 at the end of the rotating cylinder 21
It is constructed by hanging a chain 34 between the two. Note that the operating stroke of the sector gear 28 can be changed by operating the handle 35 via a worm 36 and a worm wheel 37, thereby making it possible to adjust the operating amount of the reciprocating mechanism 19 and the film drawer length of the drawer 38. It is said that

A drawer 38 connected to the reciprocating mechanism 19
is for clamping and pulling out the film starting end of the feeder 10, and is connected to the chains 2 on each side described above.
A fixed receiving plate 40 is connected between the connectors 39 connected to the connectors 5, and an opening/closing plate 41 having a continuous uneven planar shape is connected via a shaft 42, and this opening/closing plate 41 is connected to one connector. The actuation of the cylinder 43 mounted on the rod 44 and the link are made possible by the actuation of the cylinder 43 attached to the rod 39. The drawer 38 waits in an open state at the forward movement start end in response to the operation of the handle 35, and the slider 45 connected to the outside of each connector 39 is activated by the reciprocating mechanism 19.
can be horizontally moved toward the feeder 10 while slidingly contacting the guide rails 46 on each side. Note that the guide plate 18 of the feeder 10 is provided on the upper surface of the fixed receiving plate 40.
A recess is formed to fit the opening/closing plate 4.
A mat having appropriate elasticity is laid on the lower surface of the housing 1.

A rear gripper 47 facing the drawer 38
is for clamping the trailing edge of one package of film that has been pulled out, and is placed in front of a support plate 48 horizontally suspended between the bodies 1 in the front lower part of the feeder 10 via an arm 49. A fixed receiving plate 50 is attached, and a presser plate 51 with a mat connected to an operating rod 52 is provided above the receiving plate 50. Operation rod 52
is a rotating shaft 53 supported above the feeder 10.
is pivotally fitted in the center of the cylinder 5.
4, the holding plate 51 is tilted in the form of a lever via the rod 55 and the connecting plate 56 to open and close the holding plate 51 up and down.

On the other hand, the side grippers 57 of each group are for clamping the side edges of the pulled-out film, and are constructed in the same manner and are arranged opposite to each other. That is, fixed receiving plates 5 horizontally extending inside each of the fuselage 1
8 is installed appropriately below the movement line of the drawer 38, and above the receiving plate 58, an opening/closing plate 59 with a mat connected to an operating rod 60 is provided oppositely. The operating rod 60 is supported by a receiving rod 61 inside the fuselage 1, and is tilted up and down via a rod 63 by the operation of a cylinder 62 to open and close the opening/closing plate 59.
It operates in synchronization with the presser plate 51 of the rear gripper 47. Note that the opening/closing plate 59 and the presser plate 51 may be operated and set in conjunction with a common operating mechanism.

Reference numeral 64 denotes an elevating knife, which is replaceably mounted between supporting frames 65 supported at both ends of the rotating shaft 53.

(Folding device) In contrast to the above-mentioned stretching device, the folding device is
A front folding device 72 and a side folding device 7 are attached to the reciprocating mechanism 66 which is arranged in parallel with the above-mentioned reciprocating mechanism 19 on a common axis.
8, and a rear folding machine 82 that can move independently is installed opposite to the front folding machine 72.
That is, the reciprocating mechanism 66 has two rows of chains 69 suspended between chain wheels 67 at both ends of the main shaft 20 and chain wheels 68 at both ends of the vertical shaft 23.
A transmission mechanism 71 that is appropriately connected to the drive unit side is attached to the chain wheel 70 at the end, so that the chain wheel 70 can be horizontally reciprocated from side to side in the figure.

For the mechanism 66, the front folding device 72 has a bracket 75 at the center of a support plate 74 connected between sliding connectors 73 connected to the chains 69 of each row and slidingly in contact with each guide rail 77 inside the fuselage 1. Between,
It is constructed by arranging a large number of folding rods 76 in parallel. On the other hand, the side folding device 78 rods a pair of folding plates 80, which are attached to the connecting rod 79 between the fuselage bodies 1 in a horizontal cantilever state so that they can be opened and closed in a pivoting manner, to the corresponding sliding connector 73. It is configured to be articulated and supported via 81. By the operation of the reciprocating mechanism 66, the two devices 72 and 76 cooperate in folding the three edges of the film by synchronizing forward and backward movement and opening/closing movement.

On the other hand, the rear folding device 82 is located below the rear gripping device 47, and the bracket 8 at the center of the support plate 84 between both sliding connectors 83 is similar to the aforementioned front folding device 72.
It is constructed by arranging folding rods 86 in parallel between the
A rod 88 of a cylinder 87 installed at the rear of the machine body 1 is connected to the center of the support plate 84 via a connecting tool 89, so that it can reciprocate at the same horizontal height as the front folding device 72 and move in the three directions mentioned above. The folding action is followed by a trailing edge fold.

The folding bar 86 at the rear end of this folding bar 86
As shown in FIG. 10, a pipe 86 is installed between a pair of brackets 85a which are also fixed to the support plate 84 inside both brackets 85.
a, and an air supply pipe 86b made of a heat insulating material that passes through the pipe 86a and is supported by both brackets 85, and these pipes 86a are overlapped.
A pair of air injection holes 86c are provided in the middle of the air supply pipe 86b. This air supply pipe 86
A pair of heaters 86 are fixed to the support plate 84 at both ends of the brackets 85.
connected to d.

A mounting plate 84a is protruded from the center of the rear end of the support plate 84, and a pair of connecting pipes 86e are connected between both sides of a block 84b fixed to the lower surface of the mounting plate 84a and both heaters 86d. ing. An air hose 86f is connected to this block 84b.
Air supplied from this air hose 86f passes through the block 84b and both connecting pipes 86e and enters both heaters 86d, and the air warmed here passes through the air supply pipe 86b and its air injection holes as shown in FIG. It is designed to be blown out from 86c.

In this way, the rear folding device 82 is provided with an air blowing section.

Configuration of packaging section C In the packaging section C illustrated in FIGS. 12 to 16,
A packaging device installed in the center of the machine body 1 is connected and supported by a control device.

(Packaging device and its control device) First, in the packaging device, a container 90, also called a packaging pot, has a horizontally elongated circular tank shape with its upper and lower surfaces open, and has a packaging chamber 91 of an appropriate volume. A pair of guide rods 95 are installed vertically on support frames 94 on both sides of the support plate 93, and are supported so as to be movable up and down by fitting cylinders 92 projecting on both sides of the outer periphery. A retaining ring 97 for preventing the film from slipping is replaceably attached to the upper surface of the opening. ring 97
The edge portion 9 is made of, for example, a rubber material or a soft synthetic resin material that has appropriate frictional resistance with the film, and holds its entire inner edge against the inner circumferential surface of the container 90.
8, it is attached in an appropriately protruding state,
This holding edge 98 effectively exerts the frictional force or holding force when the stretched film is formed into a bag shape, so that the film can be held well and neatly formed into a bag shape. There is.

A pan-lid-shaped suction holder 99 that is openable and closable on the lower surface of the opening of the container 90 pivots both bearing arms 102 to a support shaft 101 that is fixedly supported between both arms 100 on the front surface of the outer periphery of the container 90. It is supported so that it can be fitted and tilted up and down so that it can be opened on one side. This holding body 99 has a ventilation chamber 103 inside it.
The upper plate 1 communicates with the air intake device (not shown) of the machine base via the opening 105 at the center of the lower plate 104 and a flexible tube, and forms the bottom plate for the packaging chamber 91 described above.
Air can be taken into the chamber 91 through a large number of air intake holes 107 arranged in each part of the chamber 91.

The above-mentioned packaging device has a packaging chamber for the rod 109 of the cylinder 108 installed outside the container 90 as a packaging variable mechanism to enable appropriate packaging according to the shape, size, quantity (number of items), etc. of the product. 91 are connected to each other.
The abutment plate 110 is made of, for example, a soft synthetic resin material that can easily and flexibly abut the product through the enveloping film, and is a gently curved oblong plate that fits the inner surface of the container 90. 91 By moving forward toward the center (width-aligning), the same room 9
The effective packaging area of 1 can be variably adjusted. However, in this example, for convenience, it is assumed that the moving plate 110 is set to be moved to a certain position in the center of the chamber 91 by a certain stroke operation of the cylinder 108. Of course, a variable multi-stage width shifting type may also be used.

The control device for the packaging device described above opens and closes the suction holder 99 and lifts and lowers the container 90 in parallel in a series of operating processes based on a link type. An operating lever 112 is connected to each connecting piece 113 on the lower surface of the holder 99 via a link 114, and a connecting arm 115 at the outer end of the rotating shaft 111
and the other end of the actuating lever 119 of the lever shaft 118 which is interlocked with the cam 117 of the cam shaft 116 on the drive section side are connected by a rod 120 whose length is adjustable.
As a result, when the operating lever 112 is tilted upward in the counterclockwise direction in the figure, the suction holder 99 is
After sealing, both are pushed up to a predetermined upper end position, and then, during the downward tilting process in a clockwise direction, the entire packaging device is lowered back and held stationary at the predetermined position, and the timing is set to finish the packaging. At the same time, the holding body 99 is opened downwardly.

Furthermore, in the packaging device operated by this control device, the above-mentioned rising end position is
The film f, which has passed through the side folding device 78 and has been spread and set by the spreading device, is appropriately pushed up and tightly stretched along the upper peripheral surface of the retaining ring 97, thereby effectively exerting a suction action on the film. state position, and the lower end position is such that the retaining ring 97 is appropriately lowered below the above-mentioned side folding device 78 and further below the moving surface of each of the front and rear folding devices 72, 82. is set to carry out packaging while stationary.

(Restriction and Holding Device) In order to perform better packaging in the above-mentioned packaging device, a restraint and holding device for preventing the product from slipping off is installed above the packaging device. In the device, first, the actuation mechanism 121 that is operated from the drive unit at a timely manner is a first lever 123 at the inner end of the rotating cylinder 122 that is pivotally fitted to the rotating shaft 53 of the operating rod 52 in the rear gripper 47.
and a pair of second levers 125 which are pivotally supported on a support shaft 124 above the rotation shaft 53, and a link 126 is articulated between them to form a four-bar parallel link type. The connecting arm 127 at the end is connected to the operating lever 129 of the lever shaft 118, which is interlocked with the cam 128 of the cam shaft 116, via a length-adjustable rod 130, so that the timing can be adjusted at the time of packaging. Able to move up and down in a timely manner.

A holder 13 that is replaceably equipped with respect to the above-mentioned actuation mechanism 121 and faces above the container 90
Regarding No. 1, this example shows a type in which soft synthetic resin restraining pieces 133 against articles are disposed on each part of the lower surface of a rectangular base plate 132 connected to the lower ends of both links 126. This restraining piece 133
An appropriate number of support tubes 134 are rotatably supported by the front folding device 72 and biased by a spring 135, and an appropriate number of the support tubes 134 are attached in parallel to each other and are normally held in a hanging state. rod 76, side folding device 78
When the folding plate 80 contacts and pushes the folding plate 80, the folding plate 80 is set to quickly collapse inward.

This restraining and holding device is placed on standby above outside the film draw-out line before operation, and is lowered before the start of the folding operation to bring the holding body 131 into a position where it stops the product, that is, to appropriately bring it above the top surface of the opening of the container 90. It is set to the position you set it to.

Configuration of the conveyance section D In the conveyance section D illustrated in FIGS. 17 to 19,
Two conveyors 141 and 164, a long conveyor and a short conveyor, which are synchronized and operated using a single operating mechanism 136, are installed vertically in parallel as a conveying device installed below the machine body 1. First, regarding the operating mechanism 136, the cam 137 of the camshaft 116 (however, it may also be a crank arm), and the chain wheel 139 with a one-way clutch at the end of the rotating shaft 138 horizontally suspended below the rear of the fuselage 1.
A chain 140 is hung in a V-shape between the cam 1 and an elastic body (not shown) such as a spring.
Rotation axis 13 by 180 degrees for each rotation of 37
Rotate 8.

The first conveyor 141 directly receives and carries out the packaged products discharged from the packaging device, and the roller 143 of the main shaft 142 between the machines 1 and the roller 14 of the slave shaft 144 supported by the biasing device 181
A belt 175, which will be described later, is hung between the
For the operating mechanism 136, the main shaft 14
Chain wheel 146 at the two ends and chain wheel 147 at the end of the rotating shaft 138
A chain 148 is hung between the two and connected to each other, and the motor is operated in the direction of the arrow intermittently at appropriate times.

On the other hand, the second conveyor 164 carries out packages while gently pushing them in from above and holding them therein, and is supported by a pair of suspension mechanisms 149 installed on both insides of the machine body 1 so that it can move up and down. . First, to explain both mechanisms 149 in detail, a pair of first suspension arms 15 are tiltably supported at the inner end of a support shaft 150 of the aircraft body 1 via a bearing sleeve 152.
1 is because the bearing part 153 at the other end is sandwiched from above and below by the free end part of the first receiving plate 155 made of a leaf spring, which is supported in a cantilever manner by the inner end of the support rod 154 of the fuselage body 1. , is held so that it can elastically move in the vertical direction. On the other hand, the second conveyor 1
The pair of second suspension arms 156 are tiltably supported with respect to the main shafts 165 of the first arms 156, and the receiving pieces 162 on the free end side thereof are plate springs that are cantilevered from the center of the inside of each of the first arms 151. The second of two
The free end portion of the receiving plate 163 is held between the upper and lower sides, so that the receiving plate 163 is held so as to be elastically movable in the vertical direction. However, the second arm 15 on each side
6, the movable plate 158 on the slave shaft side is connected to the support plate 157 on the main shaft side, and the guide rod 159 and the guide tube 16
0, and is always biased rearward (to the right in the figure) by a spring 161.

Regarding the second conveyor 164 supported by the above-mentioned suspension mechanism 149, both the first suspension arms 1
51 bearing portion 153 and both second suspension arms 156
The main shaft 16 is horizontally supported between the support plates 157 of
5 roller 166 and the roller 16 of the slave shaft 167 supported between the movable plate 158 of both the second arms 156
A belt 175, which will be described later, is hung between the
For the first conveyor 141, the pulleys 16 at both ends of the main shaft 142 of the conveyor 141
9 and a first pulley 170 pivotally fitted to the support shaft 150 of both suspension mechanisms 149.
1, and the second pulleys 172 on both support shafts 150 and the pulleys 173 at both ends of the main shaft 165 of the second conveyor 164 are connected to each other by means of transmission using round belts 174 hung between them.

As a result, the second conveyor 164 can operate in synchronization with the first conveyor 141, and is normally held stationary horizontally above the first conveyor 141 at a predetermined interval.
While elastic expansion and contraction of
3 can be used to move up and down independently, allowing the goods to be carried out appropriately despite changes in size.

The respective belts 175 in both the conveyors 141 and 164 described above are constructed in the same manner regardless of the difference in length. Thin synthetic rubber on the outer surface,
The upper belt portion 177 is made of a material such as vinyl that has low water absorption and dust absorption, and is flexible and stretchable.
It is bent and attached in a continuous convex shape over the conveyance direction. Then, between each bag portion 178 formed in the lower belt portion 176 and the upper belt portion 177, a relaxation material 179 such as a sponge that is flexible and can be elastically deformed is loaded, and the belt element portion 180 is
is formed. The individual element portions 180 are arranged in parallel on the same plane in the conveying direction as unique and deformable block-like units, and each of the rollers 143, 14
5, 166, and 168, even if they are temporarily separated from each other, at the horizontal transition portion between the tight side and the slack side, they remain in close contact with each other and are flexibly deformed against the packaged product. The material can be conveyed smoothly and stably without causing any biting or jamming.

Note that the cylinder 43 in each of the above-mentioned devices,
54, 62, 87, and 108 are all of the air double-acting type and are incorporated into a common air system, and are operated based on the operation of a switch installed opposite each cam on the camshaft 116. It is assumed that the settings are as follows.

Packaging operation The packaging method of this example performs packaging and conveyance according to the respective operations based on the set order of each part A, B, C, and D for one rotation of the drive part in the packaging machine configured as described above. The film that has been unwound from the film body F and set in the feeding device is pulled out and set on the upper surface of the packaging device by the spreading device, and then the film is pulled out by the suction action associated with the lifting and lowering of the packaging device by the control device. Packaging room 9
1, while the film is being held in a bag shape, the product is thrown in, and while the stop and hold device is preventing the product from slipping out, the folding device is used to fold the four peripheral edges of the film to enclose the product. When the packaging device is opened, the packaged items are discharged downward and sent out of the machine by a conveying device.

Therefore, one packaging mode in this example will be explained in detail based on FIG. 20. First, in the expansion device, the reciprocating mechanism 19 moves forward, causing the drawer 38 to move forward toward the delivery device in an open state and reach a position where it bites into the delivery device 10. At this position, the drawer 38 clamps the starting end of the film between the plates 40 and 41 by the actuation of the cylinder 43, and then moves backward by the reciprocating movement of the reciprocating mechanism 19, pulling out the film f from the feeder 10 and returning to the original position. to wait. At the end of the film drawing, the rear gripper 47 and both side grippers 57 are operated at appropriate timing, and the cylinders 54 and 62 and the operating rod 5 are operated at appropriate timing.
The trailing edge and side edges of the film f are clamped between the plates 50, 51, 58, and 59 via the plates 2 and 60, respectively, and the film f is spread and set as one sheet. (See Figures F and B) After that, the control device in the packaging section C is moved forward, and by tilting the operating lever 112 upward in accordance with the rotation of the cam 117, the suction holder 99 is first sealed to the container 90, and then guided together with the container 90. It is pushed up along the rod 95 to the rising end position. On the other hand, in the packaging device, the film suction action is started immediately after the suction holding body 99 is closed. As a result, when the container 90 reaches the rising end while pushing up the film, the holding ring 97 is used to keep the film in the packaging chamber 90 while continuing to effectively suction the center part of the film.
1, and hold it by suction while forming it into a bag shape. (See Figure A) In the above-mentioned film suction process, the puller 38 and each gripper 47, 57 in the stretching device allow appropriate extraction of each edge of the film to avoid "tearing". I'm starting to get it.

As described above, while the bag-like film portion f' is being held by suction, a predetermined amount of items W are introduced from the top of the opening of the container 90 and held by the top plate 106 of the suction holding body 99. Due to the downward tilting of the operating lever 112 accompanying the backward movement of the control device, the container 9
0 and the suction holder 99 descends while pulling the film as described above, the stopping and holding device is activated, and the holding body 131 is set to the stopping position by the downward tilting of the operating mechanism 121 according to the rotation of the cam 128. All of the stopper pieces 133 are held stationary in a state where they face the upper surface of the opening of the container 90 at the lower end position. (See Figure 2B) The knife 64 is lowered in synchronization with the activation timing of the restraining and holding device to cut the portion of the film that is connected to the feeder 10 and the rear gripper 47.

The folding device is operated and the film is folded while the article is restrained and held as described above. First, as the reciprocating mechanism 66 moves forward, the front folding device 72 moves forward and folds the front edge of the film with the folding rod 76, and in synchronization with this, the side folding device 78 narrows and folds the film with both folding plates 80. Fold the side edges of the film into each item W.
It forms a three-sided envelope for . (See Figure C) In such a three-way folding operation, each folding device 72, 78
The edge of the film clamped by the aforementioned puller 38 and side gripper 57 is pulled out and folded in the stretched state, and the holding body 1 of the restraining and holding device is folded.
Since each of the restraining pieces 133 in 31 can be stretched over the upper surface of the article while being lowered in the respective directions, the article can be neatly wrapped. Also, in this film folding, the item in the packaging chamber 91 tends to float when subjected to the tension of the film, and the holding body 131 of the above-mentioned restraining and holding device
The floating item W is pushed back at the set position to prevent it from shifting or protruding, thereby preventing it from slipping out of the container 90, so that the item can be wrapped properly.

After the above-mentioned three-way folding is completed, the final folding is then performed. That is, in synchronization with the return of each folding device 72 and 78 due to the backward motion of the reciprocating mechanism 66, the rear folding device 82 moves to the cylinder 8.
7 is advanced toward the container 90,
While pulling out the trailing edge of the film from the rear gripper 47 using the folding rod 86, the film is folded in the stretched state, and as shown in FIG.
Hot air is blown out from the air injection hole 86c of the air supply pipe 86b toward the overlapping portion P of the packaging film f that encloses the package. Therefore, the film f in the overlapped portion P is slightly melted and easily adhered, and the film f in this portion is completely adhered.

Furthermore, as _shown in FIG. Air hits the portion P ₁ and pushes the portion P ₁ downward, and bonding with hot air is performed with the films f completely overlapped at the overlapping portion P.

In this way, the upper surface of the previously folded film edge is finally stretched, and the entire surface covering of the article is completed. (See Figure 2) During such final folding, the restraining and holding device continues to hold the article as described above, and the post-folding device 82
Immediately before it interferes with the holding body 131, it is moved back, and the holding body 131 is returned to its original position by the upward tilting movement of the operating mechanism 121. Further, at appropriate timing, the presser plate 51 of the rear gripper 47 is raised and returned to its original position by the return movement of the cylinder 54, while the knife 64 is raised and returned to its original position.

After the wrapping of the article is completed as described above, the control device is moved back in time with the backward return of the rear folding device 82, and the suction holder of the packaging device in the lowered position is moved by the downward tilting of the operating lever 112. 99 is opened downwardly, the packaged goods in the chamber 91 are
W' is discharged downward toward the conveying section D while being guided by the holding body 99 as a chute member.
(See Figure E) At this point, the next film drawing operation is started in the spreading device, and the drawer 38 is advanced toward the feeder 10.

In the conveying device, the packaged product W' is transferred to the first conveyor 1 while both conveyors 141 and 164 are activated in synchronization by the actuating mechanism 136 that is activated in time with the end of packaging.
41 and sends it out as it is to the second conveyor 16
In cooperation with the push-in by 4, each belt 17
It can be smoothly and flexibly held between the element parts 180 in 5 and transported out of the machine in a stable posture. This completes one wrapping operation in this example.
(Refer to the figure) At this point, in the packaging device, due to the next operation of the control device, the packaging device moves upward toward the next film f held in the above-mentioned spreading device and starts suctioning it. The product can be packaged in the same manner based on the operating order of each part and each device described above.

In this packaging machine, if the shape, size, quantity, etc. of the product is to be changed, the film is replaced in advance by changing the position of each feeder 10 of the feeder as a preparation set for the machine. On the other hand, the effective wrapping width of the chamber 91 can be changed and set by changing the position of the drawer 38 of the spreading device, that is, the amount of film drawn out, as necessary, and operating the cylinder 108 of the packaging variable mechanism in the packaging device. This allows for efficient packaging of various items. However, in any packaging mode, while the packaged product is being released and transported as described above, there is a pre-operation for the next packaging, that is, an operation that starts drawing out the film and starting the lifting and lowering of the packaging device. It is desirable to continue packaging based on timing, and at the same time, it is possible to improve efficiency.

Other Embodiments Although not related to the main part of the present invention, the following configuration may be used.

(B) As shown in FIG. 21, an air inflow hole 200 is provided in a part of the storage container 90 to communicate the packaging chamber 91 with the outside air, and the adjustment is rotatably attached to the outer surface of the container 90. By covering the air inflow hole 200 with a lid 201, the area of communication between the air inflow hole 200 and the outside air can be changed. With this configuration, when the film f set in a stretched state on the packaging chamber 91 is sucked, air leaks into the packaging chamber 91 from the air inflow hole 200, and the suction force of the film f in the packaging chamber 91 is reduced. can be adjusted. Therefore, the degree of stretch of the film can be adjusted according to the type of film to prevent the film from tearing during suction, and as an additional effect, instead of lining the entire inner surface of the packaging chamber 91 with a bag-like film, By stopping the stretching of the bag-like film midway inside the packaging chamber, the internal volume of the bag-like film portion can be appropriately selected, so that a reliable packaging condition can be obtained according to the amount of items to be packaged.

(b) In the above-described embodiment, as shown in FIG. , 18 are not strong, so when the knife 64 descends and hits the film f, the film f is pushed into the feeder 10.
This has the drawback that the knife 64 is not able to sharply cut the film f because it is pulled out from the film and extends downward.

The embodiment shown in FIG. 23 has been improved to eliminate this drawback. That is, in this embodiment, the tilting rod 20 is attached to the rotation shaft 53.
2 is fixed, and a saw blade-shaped cutter 203 is attached to the tip thereof facing downward. A mounting portion 204 extends from the base end of the tilting rod 202 to the opposite side, and a connecting rod 205 is attached to the mounting portion 204 so as to face downward.

A tilting rod 206 is similarly attached to the lower part of the tilting rod 202 so as to be rotatable about the shaft 207, and a fine saw blade-shaped receiving seat 208 is attached to the tip thereof facing upward. There is. A hole 209 is transparently provided at the base end of the tilting rod 206, and the connecting rod 205 is inserted into this hole 209.
is now inserted. A locking ring 210 that is locked to the periphery of the hole 209 is locked to the protruding side of the connecting rod 205 so as to be movable toward the tip side of the connecting rod 205. A spring 212 is interposed between the connecting rod 205 and an outer locking ring 211 that is movably inserted into the connecting rod 205.
The locking ring 211 is prevented from coming off by an adjustment nut 213 screwed onto the tip of the locking ring 211.

Now, as shown by the imaginary line in FIG. 23, when the tilting rod 202 descends, the cutter 203 moves toward the film f, and the connecting rod 2
05 is raised and its locking ring 210 is attached to the tilting rod 20.
6, and press the seat 20 of this tilting rod 206.
8 moves toward the film f. As shown in FIG. 24, the receiving seat 208 supports the film f from below with its fine saw blade to prevent the film f from slipping in the drawing direction, and at the same time in this state, the cutter 203 supports the film f from above. f
It has a cutting action. Therefore, the film f is cut under tension by being held by the holding plate 51 and supported by the receiving seat 208, and the cutting quality is improved. Note that the spring 212 serves as a buffer material.

Effects The present invention described in detail above includes a storage container 90 with an open top surface, and an adsorption holder 99 installed at the bottom of the container 90 and connected to an air intake device. A packaging chamber 9 which can be lined with a bag-like film f and which can receive an article W.
1, and the suction holder 99 is provided with an appropriate number of suction holes 107 that communicate with the suction device and are open to the packaging chamber 91, so that the film f supplied into the storage container 90 can be The folding members 7 of the front folding device 72 are movable relative to each other in the front-back direction in response to a packaging device that can be sucked through the intake hole 107 so as to line the inner surface of the packaging chamber 91 in a bag-like manner.
6 and the folding member 86 of the rear folding device 82, and the folding members 76, 8 of both the front and rear folding devices 72, 82.
A folding member 80 of a side folding device 78 that can be opened and closed on both sides of the front folding device 6 is provided, and the forward and backward movement of the folding member 76 of the front folding device 72 and the opening and closing movement of the folding member 80 of the side folding device 78 are synchronously performed in parallel. packaging film f
The folding member 8 of the rear folding device 82 can be folded in cooperation with the three edges of the rear folding device 82.
In this packaging machine, the folding member 86 of the rear folding device 82 is capable of carrying out the trailing edge folding after the three-way folding described above, so that the article W can be wrapped with the packaging film f. The device is equipped with an air blowing section that blows out hot air toward the overlapping portion P of the packaging film f that encloses the packaging film f.

Therefore, the overlapped part P is slightly melted and adhered tightly, and the raised part P1 is eliminated from the overlapped part P due to the air jet force, and the films f are bonded by hot air in a state where they are completely overlapped. It produces the effect that can be achieved. In particular, the folding member 86 of this post-folding device 82 is the last one to be folded in from the outside following the three-way folding by the folding members 76, 80 of the other folding devices 72, 78; Attaching the hot air blowing unit is the best way to ensure that the overlapping portions P of the packaging film f enclosing the item W are in close contact with each other. Furthermore, blowing hot air at the same time as folding is effective in shortening the packaging time.

In particular, since the above-mentioned packaging device directly wraps fruits and vegetables with film, the overlapped portion of the film is uneven, resulting in very poor adhesion of the film.However, the present invention can reliably eliminate this drawback. , the effects of applying it to such a specific packaging machine are great.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view illustrating a packaging machine according to the present invention, FIG. 2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a partially cutaway plan view showing the dispensing device in an expanded state. , FIG. 5 is a sectional view taken along the line V-V in FIG. 4, FIG. 6 is a cross-sectional view mainly showing the drawer and folding portion, FIG.
9 is a sectional view taken along lines - and - in FIG. 6, FIG. 10 is a partially cutaway plan view showing the main parts of the present invention, and FIG. 11 is a sectional view taken along line XI-XI in FIG. 10. A sectional view, FIG. 12 is a side view mainly showing the packaging part,
Fig. 13 is a front view, Fig. 14 is a partially cutaway front view mainly showing the packaging device, Fig. 15 is a plan view, Fig. 16 is a side view, and Fig. 17 is an expanded view of the conveyance device. The partially cutaway plan views shown in FIGS. 18 and 19 are taken along lines X-X and X-X in FIG. 17, respectively.
Cross-sectional view based on line, Figure 20 A, B, C, D,
E and F are explanatory diagrams showing the packaging process step by step, respectively, and FIGS. 21 to 24 are explanatory diagrams showing other embodiments. Feeder...10, Reciprocating mechanism...19, Drawer...
38, Rear gripper...47, Side gripper...57, Reciprocating mechanism...66, Front folder...72, Side folder...7
8, Rear folding device...82, Folding rod...86, Air supply pipe...86b, Air injection hole...86c, Heater...8
6d, Container...90, Packaging chamber...91, Adsorption holding body...
99, ventilation chamber...103, intake hole...107, operating lever...112, operating mechanism...121, holder...13
1. 1st conveyor... 141. 2nd conveyor...
164, Belt...175, Feeding guide section...A, Drawer/folding section...B, Packaging section...C, Film...f,
Bag-shaped film portion...f', item...W, packaged item...W', overlapping portion...P, raised portion...P ₁ .

Claims (1)

[Claims] 1. A storage container 90 with an open top surface, and the container 90
The storage container 90 has a packaging chamber 91 which can be lined with a packaging film f in the form of a bag and which can receive the goods W. The suction holder 99 is provided with a suitable number of suction holes 107 which are communicated with the suction device and open to the packaging chamber 91, so that the film f to be supplied into the storage container 90 is passed through the inner surface of the packaging chamber 91. The front folding device 7 is movable relative to each other in the front and rear directions in order to accommodate a packaging device that can be suctioned through the air intake hole 107 so as to be lined in a bag-like manner.
2 folding members 76, rear folding members 86 of rear folding devices 82, and folding members 80 of side folding devices 78 that can be opened and closed on both sides of the folding members 76, 86 of both front and rear folding devices 72, 82, The forward and backward movement of the folding member 76 of the front folding device 72 and the opening/closing movement of the folding member 80 of the side folding device 78 are synchronized in parallel so that the three edges of the packaging film f can be folded in cooperation with each other. In a packaging machine in which the folding member 86 of the rear folding device 82 can perform trailing edge folding following the aforementioned three-way folding, the article W can be wrapped with a packaging film f. The folding member 86 has an overlapping portion P of the packaging film f enclosing the article W.
1. A sealing device for a packaging film stacking part in a packaging machine, characterized in that it is equipped with an air blowing part that blows out hot air toward the packaging machine.