JP3535954B2 - Vacuum packaging equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum packaging device, and more particularly to a sealing mechanism between a lid body forming a vacuum chamber between the top surface of the main body and the top surface of the main body.

[0002]

2. Description of the Related Art In a conventional vacuum packaging apparatus, a vacuum is formed between an upper surface of a main body as a placement table and a lid body that opens and closes the upper surface of the main body. There was packing. Further, in order to improve the airtightness between the lid body and the upper surface of the main body by the seal packing, for example, when the vacuum chamber (the vacuum chamber of the present application) is evacuated as described in Japanese Utility Model Laid-Open No. 4-27776. In addition, by using the negative pressure in the vacuum chamber, the lid is pulled toward the upper surface of the main body while maintaining the parallel state with the upper surface of the container (the upper surface of the main body in the present application), and the seal packing is compressed to improve the airtightness of the vacuum chamber. There was something to enhance.

[0003]

However, in this prior art, a support shaft provided on the lid body so that the lid body can be pulled while keeping the parallel state with the upper surface of the container during vacuuming. Support holes are formed in the projecting parts that protrude to both sides of the rear part of the container, and this support is formed to have a diameter larger than the support shaft,
The support shaft of the lid was supported so as to be rotatable and vertically movable.
Further, the protrusion forming the support hole is formed of the material itself forming the container. For this reason, it is difficult to machine the supporting hole with high precision in this protrusion. Also,
Since the slidability of the material forming the support hole is not good, there are problems that smooth rotation and vertical movement of the lid cannot be obtained, or abnormal noise is generated during the rotation or vertical movement.

In view of the above problems, the present invention provides a vacuum packaging apparatus in which the lid and the upper surface of the main body are highly airtight, the lid is smoothly rotated and vertically moved, and no abnormal noise is generated. The purpose is to provide.

[0005]

In order to achieve the above-mentioned object, the present invention according to claim 1 has a main body and an opening at the bottom.
And a lid that forms a vacuum chamber between the top and the bottom of the main body when the top and bottom of the main body are opened and closed in the shape of a housing. A seal packing for ensuring the airtightness between them is provided, a spindle for rotatably opening and closing the lid is attached to the rear of the lid, and the spindle is pivotally supported at the rear of the main body. A bearing stand provided with a bearing bush impregnated with lubricating oil is provided, and when the vacuum chamber has a negative pressure, the lid is attracted to the upper surface of the main body while keeping the parallel state with the upper surface of the main body. The diameter of the shaft hole of the bearing bush is larger than the shaft diameter of the support shaft so that the seal packing is compressed.

According to a second aspect of the present invention, a magnet for holding the closed state of the lid body can be moved up and down in the front portion of the peripheral edge lower end surface of the lid body in accordance with a change in the compression degree of the seal packing. It is characterized in that it is elastically attached so that

According to a third aspect of the present invention, a seal bar vertically moved by a seal cylinder mechanism provided inside the main body is projected from an upper surface of the main body, and a heat ray is formed on a lower surface of the lid body so as to face the seal bar. A receiving portion is provided so as to project, and a bag-like package is sandwiched between the seal bar and the heat ray receiving portion to perform heat sealing, and after heat sealing is completed, the heat ray receiving portion is pushed upward by the seal cylinder mechanism. It is characterized in that the lid is closed by the magnet.

Therefore, it is preferable that the invention is constructed as described above.
In the vacuum packaging device described above, since the pressure inside the vacuum chamber is atmospheric pressure immediately after the lid is closed, no force is exerted on the lid toward the upper surface of the main body, but the vacuum chamber When the is vacuumed, the inside of the vacuum chamber is in a negative pressure state, and this negative pressure exerts a force to draw the lid toward the upper surface of the main body. At this time, since the hole diameter of the bearing bush that supports the support shaft of the lid body is formed larger than the shaft diameter of the support shaft, the lid body is drawn in parallel with the upper surface of the main body, and the seal packing is compressed. The airtightness between the lid and the upper surface of the main body is kept high. Further, since the bearing that supports the support shaft of the lid is formed as a separate member from a material different from that of the main body, that is, is formed as a bearing bush from a material impregnated with lubricating oil, processing accuracy is improved. Also, the lubrication performance is improved, the rotation of the lid and the parallel movement to the upper surface of the main body are smoothly performed, and the generation of abnormal noise is eliminated.

In the vacuum packaging apparatus according to claim 2,
When the user manually closes the lid and contacts the top surface of the main body when not using the vacuum packaging device, the lid is attracted to the top surface of the main body by the magnet attached to the front part of the lower edge of the peripheral edge of the lid. And adheres to the upper surface of the main body. When the magnet is not attached in this way, it was necessary to press the lid body against the upper surface of the main body by hand or operate something like a hook to hold the lid body in a closed state. In the case of the invention, such trouble can be omitted. Further, since this magnet is attached so as to be able to move up and down according to the degree of compression of the seal packing, when the vacuum is applied and the seal packing is compressed and the lid moves in parallel to the upper surface of the main body. It does not get in the way.

In the vacuum packaging apparatus according to claim 3,
Since the seal cylinder mechanism releases the close contact holding structure between the lid body and the upper surface of the main body by the magnet, no special release mechanism is required.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described in detail with reference to FIGS. Incidentally, FIG.
FIG. 3 is a vertical cross-sectional view of the vacuum packaging device according to the first embodiment of the present invention as viewed from the side. However, in the following description, the positions or directions of the respective parts are as shown in FIG. The "front" and the right side are "rear", and the direction perpendicular to the paper surface is the left-right direction. In addition, a virtual line in the drawing shows a state in which the lid of the vacuum packaging device is closed.

In FIG. 1, a vacuum packaging device 1 includes a main body 2
0, it has a lid 10 that can be opened and closed to open and close the upper surface 21 of the main body as a placement table, and a vacuum chamber 30 is defined between the lid 10 and the upper surface 21 of the main body. The main body 20 has a box shape, and inside thereof, a vacuum pump 22, a vacuum valve 23 which may be an electromagnetically driven solenoid valve, an atmosphere opening valve 24, is manually opened and closed, and is always used during use. Ball valve 25 and seal valve 2 that are open
6, a seal cylinder assembly 40, a vacuum gauge 28, etc. are arranged.

Further, as shown in the air piping system diagram of FIG. 2, the deaeration port 29 is arranged so as to project from the upper surface 21 of the main body, and the piping d, the piping c in which the vacuum valve 23 is interposed, and It is connected to the vacuum pump 22 via a pipe a, and further connected to an atmosphere open line formed by the pipes d and e. In addition, the atmosphere release valve 2 is installed in the pipe e.
4, the ball valve 25 is interposed. Therefore, the vacuum chamber 30 is connected to the atmosphere through the atmosphere opening line by opening the atmosphere opening valve 24. Piping d
A vacuum gauge 28 is connected in the middle of the line via a pipe f. The seal valve 26 is a three-way switching valve having an atmosphere opening port 26a. The vacuum pump 22 is connected to the decompression chamber 50 (see FIG. 1) of the seal cylinder assembly 40 by the pipes b and a via the seal valve 26.

As shown in FIGS. 3 to 5, the lid 10 is a box-shaped casing having a substantially open cross-section and a relatively large rectangular recess 11 in the center thereof. Has been formed. The recessed portion 11 has a rectangular hole 12 in the center, a sealant is applied around the hole 12, and a transparent plate 13 is airtightly attached to the hole 12 via the sealant. It is configured as 30 windows. Instead of applying the sealing agent, a polyurethane foam tape is attached to the entire circumference of the hole 12 and then the transparent plate 13 is applied.
May be attached, or the transparent plate 13 may be attached via an annular seal plate made of a material having a sealing action. A concave groove 14 is formed on the entire circumference of the lower end surface of the lid body 10, and a seal packing 15 made of an O-type silicon tube is embedded in the concave groove 14, and a lower portion of the seal packing 15 is a portion of the lid body 10. It is attached so as to project from the lower end surface of the peripheral edge. In addition, a handle portion 19 which is recessed rearward is formed in the front center portion of the lower edge of the peripheral edge of the lid body 10 so that the lid body can be opened and closed by hooking a finger from the front side.

On the left side (the right side in FIG. 3) of the handle portion 19, when the lid 10 is brought into contact with the upper surface of the main body, the lid 10 is held in a closed state, and the lid 10 faces upward. There is a lid closure retention mechanism configured to release this retention when the force is applied. Next, the lid closing and holding mechanism will be described with reference to FIGS. 3, 5, 6, and 7.
Follow the explanation below. As shown in FIGS. 3 and 5, a deep recess 16 and a shallow recess 17 sandwiching the deep recess 16 are formed on the left side of the handle portion 19, and a screw hole 18 is formed in the shallow recess 17. Has been done. Further, in the recesses 16 and 17, as shown in FIG. 6, a magnet fixing member 6 made of a steel plate having a constant width and having a center portion bent in steps.
0 is inserted, and the magnet fixing member 60 is screwed to the screw hole 18 at both ends thereof. Further, a screw nut is fixed below the magnet fixing member 60 via a plate-like elastic body 61 such as a foaming agent so as to be vertically movable in the left and right directions.

Next, the structure of this screw nut stopper is shown in FIG.
It will be explained based on. In FIG. 7, 62a is a magnet 62
The mounting piece 62a has a mounting hole 62b. 63
Is a mounting screw, 64 is a plain washer, 65 is a cylindrical spacer, 66 is a plain washer, and 67 is a nut. Further, the magnet fixing member 60 is provided with a mounting hole 60b having a diameter larger than the outer diameter of the spacer 65. And the magnet 6
When attaching 2, the magnet 62 is pressed from below against the lower surface of the magnet fixing member 60 via the elastic body 61,
The flat washer 64 and the spacer 65 are arranged concentrically with the mounting hole 62b on the mounting piece 62, and in this state, the mounting screw 63 is inserted upward from the mounting hole 62b.
The plain washer 64 and the spacer 65 are simultaneously inserted, and the upper end of the spacer 65 is attached to the mounting hole 6 of the magnet fixing member 60.
0b, and the tip of the mounting screw 63 is projected upward from the upper end of the spacer 65. Then, insert the flat washer 66 into the spacer 6 by inserting the tip of the mounting screw 63.
It is placed on the upper end of the No. 5, and the nut 67 is tightened from above.

By doing so, the attachment piece 62a of the magnet 62 is fixed by being sandwiched between the head 63a of the attachment screw 63 and the flat washer 64. Further, the threaded portion of the mounting screw 63 is in a state of being covered with the spacer 65, and is in a state of penetrating the magnet fixing member 60 through the spacer 65 so as to be vertically slidable. Therefore, the magnet 6
2 is normally urged downward by the elastic force of the elastic body 61, and is movable upward by a dimension L _M against the elastic force of the elastic body 61 when an upward force is applied. .
The size of L _M is equal to or slightly larger than the bending allowance of the seal packing 15. Further, the attracting surface of the magnet 62 can be tilted to some extent by the elastic body 61 being compressed toward one side.

Next, the structure of the bearing portion of the lid 10 will be described. As shown in FIG. 3, the support bearing portions 71 are formed on both sides of the rear portion of the lid 10. The support bearing portion 71 is formed with two screw holes 72 not penetrating each other. 8 to 10 show the assembled state around the left support bearing portion 71. As shown in these drawings, the large diameter portion 74 at the center of the support shaft 73 is inserted into the support bearing portion 71 from below. The upper surface 81 a of the trihedral arm member 81 housed in the main body 20 is brought into contact with the lower portion of the large diameter portion 74, and the support shaft 7 is inserted through the through hole 77 provided in the large diameter portion 74.
3 together with the arm member 81 by means of the hexagon bolt 76
Is fixed to the screw hole 72 by screwing.

Reference numeral 82 is a bearing stand, which is fixed to a frame 83 in the main body 20. In the rear part of this bearing base 82,
As shown in FIG. 9, a side plate 82a having a bearing bush fixing hole 84 is vertically provided, and the side plate 82a projects from the upper surface 21 of the main body. A resin bearing bush 85 impregnated with lubricating oil is inserted into the bearing bush fixing hole 84 when fixing the support shaft 73. Bearing bush 85
The hole diameter of the shaft hole 85a is the diameter of the small diameter portions 75a and 75b (the small diameter portion 75a, which are the shaft portions formed at both ends of the support shaft 73).
The diameter of 75b is formed larger than the same size).
Therefore, the small diameter portions 75a and 75b are the same as the bearing bush 8 described above.
5, it is pivotally supported so as to be rotatable and vertically movable. Figure 1
1 indicates the position of the support shaft 73 when the inside of the vacuum chamber 30 is at atmospheric pressure and the seal packing 15 is in the non-compressed state. As shown in the figure, the small diameter portion 7 of the support shaft 73
A gap L _B is formed between 5a and 75b and the shaft hole 85a of the bearing bush 85. The size L _B is equal to or slightly larger than the bending allowance of the seal packing 15.

Next, the order of assembling the bearing portion will be described. First, the bearing bush 85 is fitted into the left and right bearing bush fixing holes 84. Next, since the support shaft 73 is configured such that one small diameter portion 75a is longer than the other small diameter portion 75b as shown in FIGS. 9 and 10, the longer small diameter portion 75a is Is inserted into the shaft hole 85a of the bearing bush 85 of the bearing bush 85 until the end of the large diameter portion 74 hits the bearing bush 85, and then the shorter diameter portion 75b is inserted between the side plates 82a of the bearing base 82. It is inserted into the shaft hole 85a of the other shaft hole bush 85. In this state, the support shaft 73 is disengaged when the support shaft 73 is biased toward the longer side of the small diameter portion 75a. However, the support shaft 73 can be fixed to the bearing base by making the structure around the right support bearing portion 71 symmetrical with respect to the structure around the left support bearing portion. That is, the bearing bush 85 is fitted into the bearing bush fixing hole 84 also around the right side bearing portion 71, and then the small diameter portions 75a and 75b of the support shaft 73 are put into the shaft hole 85a of the shaft hole bush 85. After that, in the left and right bearing portions, the large diameter portion 74 of the support shaft 73 is fitted into the support bearing portion 71 of the lid body 10 from below, and the upper surface portion 81a of the arm member 81 is contacted from below the large diameter portion 74. Then, the hexagonal bolts 76 are used to set the left side to the positional relationship of FIG. 10 and the right side to the symmetrical relationship of FIG.
And are fastened together with the lid 10. By fixing in this way, the support shaft 73 is axially supported by the bearing base 82 in a state where the support shaft 73 cannot freely move left and right.

As described above, the lid 10 has the arm member 8
1, and is supported rotatably and vertically movable around a support shaft 73 provided at the rear portion. As shown by phantom lines in FIG. 1, the peripheral portion of the lid 10 is the main body. When the lid 10 is closed so as to come into contact with the upper surface 21, the sealing function of the seal packing 15 causes a gap between the lid 10 and the upper surface 21 of the main body.
That is, the above-described vacuum chamber 30 is defined inside the lid 10. Further, in such a structure, the central portion of the rear vertical plate 83a of the frame 83 also serves as a stopper that restricts the opening operation of the lid 10. That is, the lid 10
1 is fully opened as shown in FIG. 1 or FIG. 12, the arm member 81 abuts the lower end of the vertical plate 83a so that the rotation of the lid 10 is restricted.

Further, as shown in FIGS. 8 and 12, the arm member 8
As described in detail below, an elastic body 86 that urges the lid 10 to rotate in the opening direction, and a leading damper (buffer mechanism) 87 that generates resistance only to the rotation of the lid 10 in the opening direction are described. Etc. are attached. That is, one end of the elastic body 86 for biasing the lid body 10 to rotate in the opening direction is preferably provided at the center of the side surface portion 81b of the arm member 81 fixed to the lid body 10 as described above. It is rotatably fixed. The other end of the elastic body 86 is preferably rotatably fixed to the front upper part of the main body 20. The elastic body 86 is formed of a coil spring in the present embodiment, but may be a rubber cord, a band, or an elastic belt. Further, the elastic body 86 is attached so as to have a natural length or a length slightly longer than the natural length in the fully opened state shown by the solid line in FIG. 12 to open the lid body 10. It is biased to rotate in the direction.

Further, below the arm member 81, a leading damper (cushioning mechanism) 87 is mounted which causes resistance only to the rotation of the lid 10 in the opening direction. Further, one end of a connecting rod member 89 is rotatably connected to the rotating body portion of the leading damper 87. The connecting rod member 89 has a slot or groove (engaging portion) 91 extending linearly from the vicinity of the other end to the central portion. The other end of the connecting rod member 89 is curved in an L shape to form a protruding portion 89a. A guide pin 93 provided at a fixed position of a support member 92 that hangs from the center of the upper portion of the main body 20 is fitted into the slot 91. Therefore, the connecting rod member 89 slides with respect to the guide pin 93 along the extension direction of the slot 91 formed in the connecting rod 89 when the arm member 81 swings as the lid 10 is opened and closed. Guided by the guide pin 93 at a fixed position, a constant movement is always possible. The guide pin 93 may be a rotating roller, and in this case, the connecting rod member 89 is guided by this roller while rotating (spinning) the roller, and can always perform a constant motion. . In this way, the connecting rod member 89 changes its tilted posture with respect to the arm member 81 in accordance with the opening / closing operation of the lid body 10, rotates the rotating body portion of the leading damper 87, and rotates the lid body 10 in the opening direction. Act to create resistance to.

An impulse heat seal mechanism for heat-sealing the bag-like package is arranged in the front portion of the vacuum chamber 30. This impulse heat sealing mechanism is a heat ray receiving portion 41 configured by a silicon plate protruding from the lower surface of the seal cylinder assembly 40 and the lid 10.
Consists of. Hereinafter, the impulse heat sealing mechanism will be described focusing on the seal cylinder assembly 40. As shown in FIG. 13, the seal cylinder assembly 40 is
O-ring 5 against the upper surface 21 of the main body to prevent airtight leakage
3, a housing 43 fixedly mounted by screws 42, a cylinder 44 formed inside the housing 43, and a piston 4 sliding vertically in the cylinder 44.
5. A cylinder rod 46, one end of which is screwed to the piston 45 through the cylinder cushion 57B, and the other end of which penetrates the housing 43 through the O-ring 54 and the oil seal 56 and extends into the vacuum chamber 30, It has a seal bar 47 and the like connected to the other end of the cylinder rod 46. A cylinder cushion 57A is provided on the upper surface of the piston 45. Also, the cylinder rod 4
A sealant is applied to the screw nut fixing portions of 6 and the piston 45 to prevent airtight leakage. By disposing the piston 45 in the cylinder 44 as described above, the decompression chamber 50 is defined above the piston 45, and the pipe joint 48 is screw-connected to the side surface of the decompression chamber 50. A pipe b is connected to 48.

Further, in the decompression chamber 50, in order to facilitate the vertical movement of the cylinder rod 46 above the central portion,
A cylindrical bush 49 is hung from the housing 45,
A coil spring 52 for urging the piston 45 downward is arranged so as to surround the outer circumference thereof. Incidentally, 53, 55
Is an O-ring, 58 is a cylinder lid, and 59 is a C-shaped retaining ring for holding the cylinder lid 58. As described above, the piston 45 is constantly urged downward by the coil spring 52, but when the decompression chamber 50 is evacuated,
A pressure difference is generated between the upper and lower surfaces of the piston 45, and this pressure difference overcomes the elastic force of the coil spring 52 and pushes it upward. The seal bar 47 is configured to be pushed upward through the cylinder rod 46 connected to the piston 45. The seal cylinder assembly 40 is arranged so that the seal bar 47 faces the heat ray receiving portion 41 when the lid 10 is closed. In addition, a sheet-shaped heater wire (not shown) is provided on the upper surface of the seal bar 47.
Is attached, and the heater wire is energized to generate heat.

In connection with the above-mentioned structure, the depressurization chamber 50 is evacuated by switching the seal valve 26, and the timing is set to be performed after the evacuation of the vacuum chamber 30 is completed. There is. With this setting, the vacuum chamber 30 has a negative pressure, and the seal bar 47 moves up after the lid 10 is attracted to the upper surface 21 of the main body. The heat generated by the heater wire on the upper surface of the seal bar 47 is raised by the seal bar 47 based on a command from a control device (not shown), and the opening of the bag-shaped package 5 is sandwiched between the heat ray receiving portion 41 and the seal bar 47. It is set to be done after being attached. Further, the decompression chamber 50 is opened to the atmosphere by switching the seal valve 26, and its timing is set to be a predetermined time after the vacuum chamber 30 is opened to the atmosphere. The area of the piston 45 is
The force generated by the pressure difference between the upper and lower surfaces of No. 5 is set so as to overcome the attraction force of the magnet 62 and the elastic force of the coil spring 52. The stroke of the piston 45 is set so that the lid 10 can be pushed upward by the seal bar 47 to a position where the lid 10 leaves the upper surface 21 of the main body.

Next, the operation of the vacuum packaging device 1 of this embodiment will be described. First, the operation of the lid opening / closing mechanism will be described. In a state where the lid body 10 is fully opened (at the time of standby), the arm member 81 is pulled forward by the elastic body 86, and the lid body 10 is fully opened as shown by the solid line in FIG. 1 or 12. . When closing the lid body 10, if the front portion of the lid body 10 is pressed by hand, the support shaft 73 rotates in the bearing bush 85 attached to the bearing base 82, and the lid body 10 rotates and closes. At this time, the arm member 81, which has been inclined at a predetermined angle with the housing outer wall 20a on the rear side of the main body 20 until then, starts rotating counterclockwise as viewed in FIG.
As shown by the dotted line in FIG. 12, it hangs down substantially parallel to the housing outer wall 20a. Furthermore, the arm member 81 causes the housing outer wall 2 on the rear side of the main body 10 as the lid 10 is closed.
0a is approached, the elastic body 86 extends and the arm member 81
The connecting rod member 89 that is connected to the sliding member 89 slides to the right in FIG. 12 while approaching the housing outer wall 20a while being guided by the slot 91 fitting into the guide pin 93 of the support member 92. When the lid 10 is fully closed, the guide pin 93 is always located at the front end of the slot 91. By such operations of the arm member 81 and the connecting rod member 89, in the well-known reading damper 87 provided on the arm member 81, the rotating body portion connected to the connecting rod member 89 rotates, but at this time, the lid 10 There is no resistance to the rotation in the closing direction.

By the operation of the opening / closing mechanism as described above, the seal packing 15 embedded in the lid 10 is replaced with the upper surface 21 of the main body.
When it comes into contact with, the lid body 10 is maintained in a closed state by overcoming the elastic force of the elastic body 86 by the attraction force of the magnet 62 as a holding mechanism provided on the lower surface of the lid body 10.
Therefore, when the vacuum packaging work is not performed, the closed state of the lid body 10 is maintained only by releasing the hand when the lid body 10 is brought into contact with the upper surface 21 of the main body.

Next, in performing the vacuum packaging operation, when the lid 10 is opened, the hand is hooked on the handle portion 19,
The lid 10 is lifted up and the lid 10 is opened (standby state). Then, the user opens the opening of the bag-shaped package 5 accommodating the packaged object 6 (see FIGS. 2 and 13) in the state where the lid 10 is opened as described above, and the seal bar 47 in the heat-sealing mechanism. Place on the tip of the (mounting process). After the bag-like package 5 to be heat-sealed in this way is placed in the vacuum chamber 30, the lid 10 is closed. In addition, in order to evacuate the vacuum chamber 30, the seal packing 15
Is squeezed to make the space between the lid 10 and the upper surface 21 of the main body airtight, and wait for the vacuum chamber 30 to have a negative pressure. At this time, the amount of bending force of the seal packing 15 changes depending on the amount of force that presses the lid body 10, and the distance between the lower end surface of the lid body 10 and the upper surface 21 of the main body changes, but the magnet 62 of the lid body closing and holding mechanism changes. Since the attracting surface changes in synchronization with the change in the gap due to the elastic force of the elastic body 61, the magnet 62 does not interfere with the closing of the lid 10. The lid 1
When 0 is abutted against the upper surface 21 of the main body and is not pressed, that is, when the lid is closed and held only by the attractive force of the magnet 62, the seal packing 15 is in a substantially natural (non-compressed) state. The support shaft 73 of the lid 10 is shown in FIG.
1, there is a gap L _B below and below it.

When the lid 10 is closed in this manner, a switch (not shown) is turned on and the vacuum pump 22 is operated in association with the closing operation of the opening / closing mechanism of the lid 10.
Then, when the vacuum pump 22 is activated, as shown in FIG. 2, the gas or the like in the vacuum chamber 30 passes through the degassing port 29, the pipe d, the pipe c, and the pipe a, and the like.
It is sucked (vacuum) by 2. When the negative pressure in the vacuum chamber 30 is reached, a force pulling the lid 10 toward the upper surface 21 of the main body acts on the lid body 10 due to the negative pressure in the vacuum chamber 30. At this time, the small diameter portions 75a, 75 of the support shaft 73 of the lid 10
Since there is a gap L _B between the shaft b and the shaft hole 85a of the bearing bush 85, the support shaft 73 and the lid 10 are moved in parallel to the main body upper surface 21 side while maintaining the parallel state with the main body upper surface 21, and the seal is formed. The packing 15 bends and the airtightness between the lid 10 and the upper surface 21 of the main body is strongly maintained. At this time,
The magnet 62 of the lid closing / holding mechanism provided on the front portion of the lower edge of the lid body 10 compresses the elastic body 61 upward in the deep recessed portion 16, and its attracting surface synchronizes with the change of the lower surface of the seal packing 15. Are pushed inwardly of the concave portion 16. Therefore, the magnet 62 does not interfere when the lid 10 is pulled toward the upper surface 21 of the main body. Further, when the magnet 62 is pushed upward, the mounting screw 63 that fixes the magnet 62 penetrates the magnet fixing member 60 via the spacer 65, so that the magnet 62 moves up and down smoothly.

Next, when the interior of the vacuum chamber 30 is sufficiently deaerated and the pressure inside the vacuum chamber 30 is reduced to a predetermined pressure or less, the vacuum valve 2
3 is closed, the degassing process is completed, and the seal valve 2
6 is switched, and the decompression chamber 50 of the seal cylinder assembly 40 is connected to the vacuum pump 22 via the pipes b and a. Then, by operating the vacuum pump 22, the gas in the decompression chamber 50 of the seal cylinder assembly 40 is sucked through the pipes b and a. As a result, the pressure in the decompression chamber 50 decreases, the piston 45 moves upward against the elastic force of the coil spring 52, and the seal bar 47 connected to the piston 45 also moves upward together. Then, the opening of the bag-shaped package 5 placed on the seal bar 47 is also moved upward together with the seal bar 47, and is sandwiched between the seal bar 47 and the heat ray receiving portion 41. Then, in the seal bar 47, the heater wire is energized to generate heat, and the bag-shaped package 5 sandwiched between the seal bar 47 and the heat ray receiving portion 41.
The opening is heat-sealed (heat-sealing step).

After a lapse of a predetermined time, the heater wire is turned off, the atmosphere opening valve 24 is opened, and the inside of the vacuum chamber 30 is opened to the atmosphere, so that the pressure inside the vacuum chamber 30 rises to the atmospheric pressure and the bag-like shape. Package 5 is packaged 6
(See FIG. 2), and the atmosphere opening process is completed. Further, due to this pressure increase, the force for closing the lid body 10 acting on the lid body 10 during the degassing step and the heat sealing step disappears. Further, since the vacuum chamber 50 of the seal cylinder assembly 40 remains in the vacuum state for a predetermined time immediately after the vacuum chamber 30 is restored to the atmospheric pressure, the upward pressure based on the pressure difference between the upper and lower surfaces of the piston 45 is increased. The force acts on the lid body 10 via the seal bar 47 and the heat ray receiving portion 41.
Therefore, the lid body 10 has a pushing force of the piston 45, a pulling force of the elastic body 86, and the seal packing 15.
An upward force is exerted by the restoring force of. On the other hand, in the lid body 10, when the support shaft 73 is inside the bearing bush 85, as shown in FIG.
Move upward while keeping the parallel state with the top surface of the main body until the position of. At this time, the magnet 62 is not
Since it is elastically attached to the inside of 6 via the elastic body 61 so as to be movable up and down, until the support shaft 73 reaches the position of FIG. 11, that is, until the seal packing 15 is restored to the non-compressed state. It is in contact with the upper surface of the main body, and the lid body 10 is still attracted to the upper surface side of the main body by the attraction force of the magnet 62.

In such a state, as described above, the opening of the inside of the decompression chamber 50 of the seal cylinder assembly 40 to the atmosphere is timed so as to be performed after a predetermined time has elapsed from the time when the vacuum chamber 30 was opened to the atmosphere. Therefore, the piston 45 pushes the lid 10 further upward via the seal bar 47 and the heat ray receiving portion 41. Then, the lid 10 is lifted until the magnet 47 no longer contacts the upper surface of the main body, and a predetermined time elapses. As a result of such an operation, after the heat sealing is completed, the lid body 10 is quickly lifted until it is separated from the upper surface 21 of the main body.
Further, the lid body 10 is lifted up until it is separated from the upper surface 21 of the main body, whereby the closing and holding by the lid body closing and holding mechanism including the magnet 62 as a component is released. After that, the lid body 10 is gradually opened by the elastic force of the elastic body 86 (opening operation of the lid body 10).

The opening operation of the lid 10 is stopped when the arm member 81 abuts against the central portion 83a (see FIGS. 1 and 12) of the rear vertical plate of the frame 83 as a stopper.
And a fully open state as shown by the solid line in FIG. Further, when the lid 10 is opened, the arm member 81 that is substantially parallel to the housing outer plate 20a on the rear side of the main body 20.
12 rotates clockwise as viewed in FIG. 12, and as shown by the solid line in FIG. 12, moves so as to incline at a predetermined angle with the rear housing outer plate 20a. Further, the connecting rod member 89 connected to the arm member 81 has a support member 92 in which the arm member 81 is at the center of the main body 20 as the lid 10 is opened.
Since it approaches the support member 92,
While rotating counterclockwise (as viewed in FIG. 12), guide pin 92 moves in a direction away from housing outer wall 20a such that guide pin 92 moves relatively along slot 91. Leading damper 8 provided on the arm member 81
In FIG. 7, the rotating body portion connected to the connecting rod member 89 is the arm member 81 and the connecting rod member 89 when the lid 10 is opened.
The rotation causes the lid 10 to rotate, and resistance is added to the rotation of the lid 10 in the opening direction. Therefore, the lid 10 is slowly opened, and the arm member 81 does not vigorously contact the central portion 83a or the like of the rear vertical plate of the frame 83 as a stopper. Therefore, the impact due to the collision between the arm member and the frame 83 does not occur. Does not happen.

When the lid 10 is opened, the heat ray receiving portion 41 protruding from the lower surface of the lid 10 is pulled upward, and the bag shape formed by the heat ray receiving portion 41 and the seal bar 47. The sandwiching of the opening of the package 5 is released (clip release), and the bag-shaped package 5 can be taken out.
Further, when a predetermined time has passed since the vacuum chamber 30 was opened to the atmosphere, the seal valve 26 is switched, and the inside of the decompression chamber 50 of the seal cylinder assembly 40 is connected to the atmosphere through the atmosphere opening port 26a of the seal valve 26, and the decompression chamber is opened. The pressure of 50 rises to atmospheric pressure, the piston 45 moves downward due to the elastic force of the coil spring 52, the cylinder rod 46 and the seal bar 47 also move downward together, and the initial standby state is restored.

[0036]

Since the present invention is constructed as described above, it has the following effects. According to the first aspect of the present invention, since the bearing supporting the support shaft of the lid is formed as a bearing bush by a material impregnated with lubricating oil, the machining accuracy and the lubrication performance are improved, and the lid is rotated. Also, the parallel movement to the upper surface of the main body is smoothly performed, and the generation of abnormal noise is eliminated.

According to the second aspect of the present invention, when the vacuum packaging device is not used, the lid can be held in the closed state by the magnet attached to the front portion of the lower edge of the peripheral edge of the lid. Further, since this magnet is elastically attached so as to be able to move up and down according to the degree of compression of the seal packing, a vacuum is drawn to compress the seal packing and keep the lid parallel to the upper surface of the main body. It does not interfere with the parallel movement to the top of the main unit while holding it.

According to the third aspect of the invention, since the seal cylinder mechanism releases the close contact holding structure between the lid body and the upper surface of the main body by the magnet, no special releasing mechanism is required.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a vacuum packaging device according to an embodiment of the present invention.

FIG. 2 is an air piping system diagram of the vacuum packaging device shown in FIG.

3 is a bottom view of a lid of the vacuum packaging device shown in FIG. 1. FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is a view showing a mounting structure of a magnet of the vacuum packaging device shown in FIG.

FIG. 7 is an enlarged view around a mounting screw in FIG.

8 is a structural diagram of a support bearing portion of the lid shown in FIG.

9 is an exploded perspective view of a support bearing portion of the lid body shown in FIG.

10 is a sectional view taken along line XX in FIG.

FIG. 11 is a drawing showing the relationship between the support shaft of the lid shown in FIG. 1 and the shaft hole of the bearing bush.

FIG. 12 is a view illustrating an opening / closing mechanism of the lid body shown in FIG.

13 is an explanatory view of a seal cylinder mechanism of the vacuum packaging device shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Vacuum packaging device, 5 ... Bag-shaped package, 6 ... Packaged object, 1
0 ... Lid, 15 ... Seal packing, 16 ... Deep recess,
17 ... Shallow recess, 18 ... Screw hole, 20 ... Main body, 21 ... Main body upper surface, 29 ... Deaeration port, 30 ... Vacuum chamber, 40
... Seal cylinder assembly, 41 ... Heat ray receiving part, 45 ... Piston, 46 ... Cylinder rod, 47 ... Seal bar, 50 ... Decompression chamber, 52 ... Coil spring, 60 ... Magnet fixing member, 61 ...
Elastic body, 62 ... Magnet, 62a ... Magnet mounting piece, 60
b, 62b ... Mounting hole, 63 ... Mounting screw, 63a
... Heads of mounting screws, 64, 66 ... Plain washers, 65 ... Cylindrical spacers, 67 ... Nuts, 71 ... Support receiving portions, 72 ...
Screw hole, 73 ... Support shaft, 74 ... Large diameter portion, 75a, 75b ...
Small diameter portion, 81 ... Arm member, 81a ... Top surface portion, 81b ... Side surface portion, 82 ... Bearing base, 82a ... Bearing base side plate, 83 ... Frame, 84 ... Bearing bush fixing hole, 85 ... Bearing bush, 85a ... Shaft Hole, 86 ... Elastic body.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-4-280260 (JP, A) JP-A-6-325806 (JP, A) JP-A-4-69882 (JP, A) JP-A-4- 126979 (JP, A) Actual development 3-120407 (JP, U) Actual development 7-11322 (JP, U) Actual development Sho 58-39702 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B65B 31/00

Claims (3)

(57) [Claims] 1. A main body, and a lid that forms a vacuum chamber between the main body and an upper surface of the main body that is opened and closed in the shape of a housing having an opening at the bottom and closes the upper surface of the main body. A seal packing for securing the airtightness between the upper surface of the main body and the lid is arranged on the entire circumference, and a spindle for rotatably opening and closing the lid is attached to the rear of the lid. A bearing stand equipped with a bearing bush impregnated with lubricating oil for supporting the support shaft is provided at the rear of the main body, and when the vacuum chamber has a negative pressure, the lid is in parallel with the upper surface of the main body. A vacuum packaging device, wherein a diameter of a shaft hole of the bearing bush is made larger than a shaft diameter of the support shaft so that the seal packing is compressed while being held while being held. 2. A magnet for holding the closed state of the lid body is elastically attached to the front portion of the lower edge of the periphery of the lid body so that the magnet can be moved up and down in accordance with the change in the compression degree of the seal packing. The vacuum packaging device according to claim 1, wherein the vacuum packaging device is attached to the vacuum packaging device. 3. A seal bar that is vertically moved by a seal cylinder mechanism provided inside the main body is projected from the upper surface of the main body, and a heat ray receiving portion is provided on the lower surface of the lid so as to face the seal bar, A bag-like package is sandwiched between the seal bar and the heat ray receiving portion and heat-sealed, and after the heat-sealing is completed, the heat-ray receiving portion is pushed upward by the seal cylinder mechanism, and the lid body is formed by the magnet. The vacuum packaging device according to claim 2, wherein the vacuum packaging device is configured to release the closed state.