JPS6323044B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention supports a packaging bag containing an object to be packaged in a vacuum box, and after changing the inside of the vacuum box to a vacuum environment, The present invention relates to a bag support mechanism for supporting the bag in a hanging shape in the vacuum box in a vacuum packaging apparatus that heat-seals the opening of the bag.

(Prior art) A conventional rotary vacuum packaging device rotates multiple sets of two purely mechanical clips at equal intervals on a circular orbit, and sequentially supplies packaging bags to each set of clips. After opening the clamped bag and filling it with the item to be packaged, the bag is sent together with the clips into a vacuum box for vacuum packaging. On the other hand, when packaging bags are supplied, since each bag has a different distortion, clamping errors occur when repeatedly clamping the bags that are supplied one after another. With these automatic machines, a 2-3% error rate is unavoidable. On this point, Utsukai 51-
Publication No. 106670 discloses that multiple sets of two clamping bars are rotated in a circular orbit, and the two clamping bars are brought close to each other by the guidance of a grooved cam provided at the center of the circular orbit to hold a packaging bag. At the same time as the bag is clamped, the bag is attracted by the vacuum suction force that acts on the suction holes formed on the opposing surfaces of the two clamping bars, and when the gap between the two clamping bars is widened, the opening of the bag is also automatically expanded. Such a mechanism is disclosed, and since this mechanism clamps the entire bag with two clamping bars, it has the advantage of being able to reliably clamp the bag even if the bag is slightly distorted.

(Problems to be solved by the invention, etc.) However, even if the bag support mechanism that utilizes the vacuum suction force as described above is directly applied to a vacuum packaging device,
Inside the vacuum box, there is no differential pressure and the vacuum suction power no longer functions at all, so the bag supported by the clamping bar would slide downwards due to the weight of the packaged items, making it unusable. .

In view of the above-mentioned points, the present invention has been developed to provide a vacuum box which maintains the force of compressing the bag even if the differential pressure that attracts the bag to the clamping bar in the vacuum box disappears, and which does not impede the removal of air within the bag. The object is to provide a bag support mechanism.

In order to achieve the above object, the present invention has a disc that is installed perpendicularly or approximately vertically around the rotor and rotates together with the rotor, and an airtight system that is in contact with the front surface of the disc. Vacuum packaging comprising a lid material forming a chamber, a packaging bag supported in a hanging shape in the airtight chamber, and an opening of the packaging bag sealed after the chamber is changed to a vacuum environment. In the apparatus, the mechanism for supporting the packaging bag in a suspended manner in the airtight room is a lateral mechanism provided in front of the board through a cushion spring so that the cushion spring pushes the bag out in front of the board. A long fixed suction block is located in front of the fixed suction block and engages with a cam via a rod that penetrates the plate, and the cam contacts the fixed suction block by the action of the cam. and a movable suction block that performs a separating action, and suction holes are formed on the opposing surfaces of the two suction blocks, and each suction hole is communicated with a vacuum source through a hollow part in the two suction blocks. In addition, a plurality of elastic materials are scattered at appropriate intervals between the opposing surfaces of both suction blocks, and the elastic materials are fixed to at least one suction block so as to form a gap between both suction blocks. This is what I did.

(Function) A fixed suction block is provided in front of a plate installed perpendicularly around the rotor, while a movable suction block provided in front of the fixed suction block is connected to a cam via a rod penetrating the plate. The cam is engaged with the cam so that the cam moves toward and away from the stationary suction block. Further, suction holes are formed in opposing surfaces of both suction blocks, and the suction holes are communicated with a vacuum source through hollow portions in both suction blocks. For this reason, the packaging bag is supplied to a place where the space between the two suction blocks is relatively open, and when both the suction blocks approach each other, the packaging bag is suctioned into the suction hole on the opposing surface of these blocks. The mouth of the packaging bag is opened by widening the distance between the two suction blocks, and the mouth of the packaging bag is closed by bringing the two suction blocks closer together.

When both suction blocks approach, the cushion spring between the plate and the fixed suction block is compressed, and the reaction force presses the fixed suction block against the surface of the movable suction block. The packaging bag is supported between both suction blocks even if there is no differential pressure to suction the bag.

Furthermore, since a plurality of elastic materials are provided on one side of the adsorption block, the bag is more reliably supported by friction with the elastic materials, and the air inside the packaging bag passes through the elastic materials. It is then discharged.

(Example) Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, a cylindrical bearing 5 is vertically fixed on the upper surface of a table-like machine base 4, and a cylindrical main shaft 6 is rotatably supported within this bearing. A circular rotor 2 is fixed to the upper end in an umbrella shape, and the rotor is supported on the upper surface of the bearing 5 via a thrust bearing 7. Furthermore, while a Geneva 8 divided into six equal parts is fixed to the lower end of the main shaft 6, a crank pin 10 provided on the drive shaft 9 is periodically engaged with the Geneva 8, so that it is arranged at equal intervals around the circumference of the rotor 2. Six vertically disposed plates 1 are rotated intermittently at one-sixth rotations each. Further, a core rod 11 is arranged inside the cylindrical main shaft 6, and a grooved cam plate 1 is arranged on the circular rotor 2.
2 and the aforementioned core rod 11 are connected.

In FIG. 1, only one of the six boards 1 is shown, but as shown in FIG. 2, a pair of suction bars 15 are arranged in front of each board 1. The suction bar is composed of a fixed suction block 22 that is elongated in the horizontal direction, and a movable suction block 23 that is disposed opposite to the front side of the block. A rod 24 with a cylindrical cross section fixed in a shape
is passed through the front and back of the board 1 in an airtight manner. Furthermore, both the fixed side suction block 22 and the movable side suction block 23 are formed in a hollow shape in order to apply a vacuum suction force inside, and have a plurality of suction holes 31, 31, 32,
32 and has one end connected to the hollow part 33 in the fixed side suction block 22.
4 to the vacuum passage 35 formed in the rod support boss 25, and the hollow part 36 in the movable suction block 23 to the vacuum passage 35 in the boss through the cylindrical rod 24 at one end. It's forcing me. An elongated hole 37 of a predetermined length is formed in the side surface of the cylindrical rod 24 so that a vacuum is always applied to the hollow portion 36 even when the rod 24 is stroking. Furthermore, the stationary suction block 22 is not completely fixed to the board 1, but is slightly displaced via cushion springs 38, 38. That is, a plurality of pins 39, 39 fixed to the back surface of the block 22 are slidably engaged with holes 41, 41 made in a pedestal 40 fixed to the front surface of the board 1, and the heads 42, 42 of the pins are also engaged. The position of the block 22 is fixed, and the spring 38,
38 was inserted. On the other hand, on the surface of the movable suction block 23 facing the fixed suction block 22, a plurality of elastic members 43 are provided between the respective suction holes 31, 31, 32, 32 so as to protrude from the block surface. .

As shown in FIG. 1, a joint 46 is rotatably provided at the upper end of the core rod 11, to which a hose 44 connected to a vacuum pump is connected, and from which six hoses 45 branch out from the side. . A pin 47 provided at the lower end of the joint is slidably inserted into a hole 48 at the upper end of the core rod, and each of the six hoses 45 is connected to the vacuum passage 35 in the boss 25 provided on the back side of the panel 1. ing.

The illustrated embodiment is configured as described above,
The action will be explained below.

In FIG. 1, the crank pin 10 that revolves around the continuously rotating driving shaft 9 kicks the Geneva 8 every cycle, so the six plates 1 fixed to the main shaft 6
rotates intermittently by 60 degrees. A pulley 28 provided at the end of the rod 24 engages with a cam groove 29, and the bending of the cam groove 29 causes the rod 24 to move during one rotation of the disk.
4 is pushed out several times in the centrifugal direction of the rotor 2 and pulled in toward the center of the rotor. In FIG. 2, a small gap is formed between the suction bars 15, but when the plate 1 reaches a predetermined position, the movable suction block 2 is moved by the rod 24.
3 is separated from the fixed suction block 22 to enlarge the gap between the suction bars 15. As the gap expands, bags are supplied into the gap. Next, when the plate 1 starts to rotate laterally, the gap between the suction bar 15 is immediately reduced and both sides of the bag are suctioned by the opposing suction holes 31 and 32, and then the gap between the suction bar 15 is expanded. 's mouth opens wide. Board 1
When the rotation of the bag stops, the packaged item is fed from the mouth of the bag at that position. When the disk 1 starts to rotate again, the movable suction block 23 approaches the fixed suction block 22 and partially clamps the bag opening with the plurality of elastic members 43, 43, . . . . In this case, the movable suction block 2
3 presses the stationary suction block 22 enough to compress the cushion springs 38, 38 sufficiently. At some of the six stopping positions of the board 1, lid members 51 as shown in FIG. 51 contacts the board 1 to form an airtight chamber 20 inside. Subsequently, the air in the chamber 20 is removed through a predetermined pipe, and as the pressure in the chamber 20 decreases, the air in the bag X is removed from the portions not clamped by the elastic members 43. As the inside of the lid member 51 approaches the vacuum value, the pressure difference between the inside and outside of the suction bar 15 disappears, and the ability to suction and lower the bag is lost, but due to the reaction force of the cushion spring 38 and the The bag X is held between the suction bars 15 by frictional force. Thereafter, the seal bar 18 is pushed out by the actuator 17, and the opening of the bag X is melt-sealed.

(Effects) In the present invention, a cushion spring is provided between the board and the fixed suction block on the front surface of the board, so that the fixed suction block is pushed out toward the front of the board, and the fixed suction block is A movable suction block is provided at the front and moved toward and away from the fixed suction block by means of a cam, and a plurality of elastic materials are interspersed between the two suction blocks.
The packaging bag is supported between both suction blocks by the frictional force of each elastic material and the reaction force of the cushion spring, and as a result, the vacuum suction force of both suction blocks no longer functions in the vacuum box. In addition, the packaging bag can be reliably supported between both suction blocks, and a gap for air suction is formed at the opening of the packaging bag between each elastic material. This has the effect of making it possible to utilize a suction block with less bag clamping errors in a vacuum packaging device.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, and is a partially omitted and sectional front view, and Fig. 2 is a front view of the previous figure.
The line view, FIG. 3, is a partial configuration diagram of the vacuum box in the - line view of the previous figure. 1...Plate, 2...Rotor, 12...Groove cam plate,
20... Chamber, 22... Fixed side suction block, 23
...Movable suction block, 38...Cushion spring, 43...Elastic material, 51...Lid material.

Claims (1)

[Claims] 1. A disk that is installed perpendicularly or approximately vertically around the rotor and rotates together with the rotor; a lid that contacts the front surface of the disk and forms an airtight chamber with the disk; In a vacuum packaging device that supports a packaging bag in a hanging shape in an airtight room and seals the opening of the packaging bag after the room is changed to a vacuum environment, packaging is carried out in the airtight room. The mechanism for supporting the bag in a hanging manner includes a horizontally long fixed suction block provided in front of the board via a cushion spring so as to be pushed out to the front of the board by the cushion spring; A movable suction block is located on the front surface of the side suction block and engages with a cam via a rod penetrating the plate, and the action of the cam moves the movable suction block toward and away from the fixed suction block. Further, suction holes are formed on the opposing surfaces of both the suction blocks, and these suction holes are communicated with a vacuum source through the hollow portions in the both suction blocks, and the suction holes are formed on the opposing surfaces of the both suction blocks. A support mechanism for a bag in a vacuum packaging apparatus, in which a plurality of elastic materials are interspersed at appropriate intervals, and the elastic materials are fixed to at least one suction block so as to form a gap between the two suction blocks.