JPH1143107A - Vacuum packaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum packaging device being constituted in such a manner that a lid body can be kept closed when the vacuum packaging device is paused, and also, the keeping of the closed state of the lid body can be released when a heat-sealing is completed without requiring a special device. SOLUTION: A lid body closed state keeping mechanism (e.g. magnet) being constituted in such a manner that a lid body 10 can be kept under a closed state by bringing the lid body 10 into contact with a main body upper surface 21, and the keeping can be released by applying an upward force to the closed lid body 10, is provided on the peripheral edge lower end surface of the lid body 10, and from a point when a heat-sealing is completed, and a vacuum chamber 30 is opened to the atmosphere, for a specified period of time, the upward force is applied to the lid body 10 through a heat beam receiving part 41, by a seal bar 47 of a seal cylinder mechanism, and the lid body 10 is lifted until the lid body 10 separates from the main body upper surface 21, and the closed state of the lid body 10 by the lid body closed state keeping mechanism is released. A spindle 73 of the lid body 10 may be vertically movable.

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 device for releasing a closure holding mechanism of a lid.

[0002]

2. Description of the Related Art In a conventional general vacuum packaging apparatus, a seal packing is provided on a lower end surface of a peripheral edge of a lid which opens and closes an upper surface of a main body as a placement table. The airtightness with the lid is maintained, and the space between the upper surface of the main body and the lid is formed as a vacuum chamber. Also, after the vacuum chamber is evacuated, the negative pressure in the vacuum chamber attracts the lid, so no special means for clamping the seal packing is required, and the lid is closed and the vacuum pump is driven. Until the lid is kept closed, the vacuum chamber is evacuated. On the other hand, since the lid is constantly urged in the opening direction by the elastic body housed in the main body, when the heating is completed and the inside of the vacuum chamber is opened to the atmosphere, the lid is automatically opened. Was configured to work.

[0003] Therefore, when the vacuum packaging operation is suspended, unless the lid is forcibly held in a closed state, the lid remains open by the elastic body, and dirt and dust accumulate in the vacuum chamber. The problem of becoming unsanitary will arise. For this reason, the conventional vacuum packaging apparatus employs a lid closing / holding mechanism that holds the lid in a closed state by hooking a hook provided on the main body to the lid during the rest period.

[Problems to be solved by the invention]

However, in such a vacuum packaging apparatus, hooking and removal of a hook are troublesome,
There are problems that the lid is easily left open and the structure is complicated. As a measure to avoid this, a magnet is attached to the front edge of the lower surface of the lid, the mounting surface of the magnet is set according to the lower surface of the lid at rest, and the lid is closed at rest and the lid is kept closed by this magnet There is a way to do it. However, since the closing of the lid by the magnet works even when the vacuum packaging device is used, upon completion of the heat sealing, the elastic body stored in the main body releases the closing and holding by the magnet, When the lid is automatically opened, the opposing force acting on the elastic body increases. For this reason, there is a problem that the lid cannot be opened with the elastic force of the conventional elastic body. Further, when the elastic force of the elastic body is increased, a defect that the elastic body and a member to which the elastic body is attached becomes large occurs. In addition, there is a problem that the lid is vigorously opened, and the worker is harmed, and the sound and vibration caused by the shock when the lid is fully opened are increased.

The present invention has been made in view of such problems of the prior art, and an object of the present invention is to enable the lid to be closed and held when the vacuum packaging apparatus is stopped. It is another object of the present invention to provide a vacuum packaging apparatus configured so that the closed state of the lid can be released when heat sealing is completed without requiring a special apparatus.

[0006]

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention according to claim 1 has a main body and a lid, and a support shaft is provided at a rear portion of the lid. The support shaft is rotatably supported by a bearing provided at the rear part of the upper surface of the main body so that the upper surface of the main body can be opened and closed, and the confidentiality between the upper surface of the main body and the lid is secured around the entire lower end surface of the lid. A sealing chamber for closing the lid, defining a vacuum chamber between the lid and the upper surface of the main body when the lid is closed, and moving the seal bar up and down by a seal cylinder mechanism provided inside the main body. A heat ray receiving portion is protruded from the upper surface and is provided on the lower surface of the lid so as to face the seal bar. During heat sealing, a bag-like package is sandwiched between the seal bar and the heat ray receiving portion and heat sealed. The lid is always attached in the opening direction by an elastic body. And, in the vacuum packaging apparatus as the automatically open the lid during heat-sealing completed,
On the peripheral lower end surface of the lid, when the lid is closed and brought into contact with the upper surface of the main body, the lid is held in a closed state, and the upward holding force is applied through the lid to close the lid. A lid closing / holding mechanism to be released is provided, and a predetermined time after the heat sealing is completed and the vacuum chamber is opened to the atmosphere, the seal bar of the seal cylinder mechanism is attached to the lid via the heat ray receiving portion by the seal bar. An upward force is applied to lift the lid body away from the upper surface of the main body to release the lid from being closed and held by the lid closing and holding mechanism.

Therefore, the first aspect of the present invention is configured as described above.
In the vacuum packaging apparatus described above, when the vacuum packaging apparatus is at rest, the lid is held in a closed state by the lid closing and holding mechanism. Further, when the heat sealing is completed and the vacuum chamber rises to the atmospheric pressure, the negative pressure of the vacuum chamber that attracts the lid to the upper surface of the main body is released. Then, the lid is subjected to an upward force via the heat ray receiving portion or the like by the seal bar of the seal cylinder mechanism for a predetermined time, and is lifted and separated from the upper surface of the main body. As a result, the closure of the lid by the lid closing and holding mechanism is released. Thereafter, the lid is automatically opened by the elastic force of the elastic body that constantly urges the lid in the opening direction.

The lid closing and holding mechanism is versatile,
From the viewpoint of durability and ease of selection of the holding force, it is preferable to employ a magnet as in the second aspect of the present invention. Also,
According to the present invention, as in claim 3, the support shaft of the lid is vertically movably mounted, and at the time of evacuation, the lid is attracted to the upper surface of the main body to compress the seal packing, and the space between the lid and the upper surface of the main body is reduced. It can also be configured to improve the airtightness.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to FIGS. FIG.
Is a longitudinal sectional view of the vacuum packaging device according to the first embodiment of the present invention as viewed from the side. In the following description, regarding the position or direction of each part, the left side when viewed in FIG. “Front” and the right side are “rear”, and the direction perpendicular to the paper is the left-right direction. The imaginary line in the figure indicates 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, a lid 10 that can be opened and closed to open and close the main body upper surface 21 as a placement table, and a vacuum chamber 30 is defined between the lid 10 and the main body upper surface 21. The main body 20 is box-shaped, and has a vacuum pump 22, a vacuum valve 23 which may be an electromagnetically driven solenoid valve, an atmosphere release valve 24, and a manually opened and closed always used when used. Open ball valve 25, seal valve 2
6, a seal cylinder assembly 40, a vacuum gauge 28 and the like are provided.

As shown in the air piping system diagram of FIG. 2, the deaeration port 29 is provided so as to protrude from the upper surface 21 of the main body, and has a piping d, a piping c with a vacuum valve 23 interposed, and It is connected to a vacuum pump 22 via a pipe a, and further connected to an open-to-atmosphere line formed by pipes d and e. The pipe e has an atmosphere release valve 2
4. A ball valve 25 is interposed. Therefore, the vacuum chamber 30 is communicated with the atmosphere through the atmosphere opening line by opening the atmosphere opening valve 24. Piping d
Is connected to a vacuum gauge 28 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 a decompression chamber 50 (see FIG. 1) of the seal cylinder assembly 40 via pipes b and a via the seal valve 26.

As shown in FIGS. 3 to 5, the lid 10 is a housing having a substantially U-shaped cross section with an opening at the bottom, and a relatively large rectangular recess 11 at the center thereof. Is formed. The concave portion 11 has a rectangular hole 12 in the center, a sealant is applied around the hole 12, a transparent plate 13 is airtightly attached to the hole 12 through the sealant, and a vacuum chamber is provided. It is configured as 30 windows. Instead of applying a sealing agent, a polyurethane foam tape is attached to the entire periphery of the hole 12 and the transparent plate 13
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 groove 14 is formed around the entire lower end surface of the lid 10, and a seal packing 15 made of an O-shaped silicon tube is embedded in the groove 14. A lower portion of the seal packing 15 is It is attached so as to protrude from the peripheral lower end surface. In addition, a handle portion 19 that is recessed rearward is formed at the front center portion of the lower end surface of the peripheral edge of the lid 10 so that a finger can be pulled from the front to open and close the lid.

On the left side (right side in FIG. 3) of the handle 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. A lid closing / holding mechanism configured to cancel the holding when a force of (1) is applied is attached. Next, FIG. 3, FIG. 5, FIG. 6, and FIG.
It will be described according to the following. 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 19, and a screw hole 18 is formed in the shallow recess 17. Have been. As shown in FIG. 6, the recesses 16 and 17 are provided with a magnet fixing member 6 made of a steel plate having a constant width and having a central portion bent stepwise.
The magnet fixing member 60 is screwed into the screw hole 18 at both ends. In addition, a screw nut is fixed below the magnet fixing member 60 via a plate-shaped elastic body 61 such as a foaming agent so as to be vertically movable in the left and right directions.

Next, the structure of the screw nut fixing portion is shown in FIG.
It will be described based on. In FIG. 7, 62a is a magnet 62
The mounting piece 62a is provided with a mounting hole 62b. 63
Is a mounting screw, 64 is a flat washer, 65 is a cylindrical spacer, 66 is a flat washer, and 67 is a nut. The magnet fixing member 60 is provided with a mounting hole 60 b having a diameter larger than the outer diameter of the spacer 65. And the magnet 6
When attaching the magnet 2, the magnet 62 is pressed against the lower surface of the magnet fixing member 60 via the elastic body 61 from below,
The flat washer 64 and the spacer 65 are arranged on the mounting piece 62 concentrically with the mounting hole 62b, and in this state, the mounting screw 63 is inserted upward from the mounting hole 62b,
The flat washer 64 and the spacer 65 are inserted at the same time, 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, the flat washer 66 is inserted into the spacer 6
5 and the nut 67 is tightened from above.

By doing so, the mounting piece 62a of the magnet 62 is sandwiched and fixed between the head 63a of the mounting screw 63 and the flat washer 64. Further, the screw portion of the mounting screw 63 is covered by the spacer 65, and penetrates the magnet fixing member 60 so as to be able to slide up and down via the spacer 65. 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 the L _M is equal or slightly greater and Shiwawami margin of the seal packing 15. The attraction surface of the magnet 62 can be slightly inclined by the compression of the elastic body 61 to one side.

Next, the structure of the bearing portion of the lid 10 will be described. As shown in FIG. 3, support bearings 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 that are not penetrated. FIGS. 8 to 10 show the assembled state around the left support part 71. As shown in these drawings, a large diameter part 74 at the center of the support shaft 73 is inserted into the support part 71 from below. The upper surface portion 81a of the trihedral arm member 81 housed in the main body 20 is contacted below the large diameter portion 74, and the support shaft 7 is inserted through a through hole 77 provided in the large diameter portion 74.
3 is a cover 10 with a hexagon bolt 76 together with an arm member 81.
The screw holes 72 are fixed by screws.

Reference numeral 82 denotes a bearing stand fixed to a frame 83 in the main body 20. At the rear of the bearing base 82,
As clearly shown in FIG. 9, a side plate 82 a having a bearing bush fixing hole 84 is vertically provided, and the side plate 82 a protrudes 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 the support shaft 73 is fixed. Bearing bush 85
The diameter of the shaft hole 85a is smaller than the diameter of the small-diameter portions 75a and 75b (small-diameter portions 75a and 75b) which are shaft portions formed at both ends of the support shaft 73.
75b (the diameter is the same).
Therefore, the small diameter portions 75a and 75b are
5 allows it to be pivotally supported and vertically movable. FIG.
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 a non-compressed state. As shown in FIG.
5a, a gap L _B is formed between the shaft hole 85a of 75b and the bearing bushing 85. The dimension L _B is equal or slightly greater and Shiwawami margin of the seal packing 15.

Next, the order of assembling the bearing parts will be described. First, the bearing bush 85 is fitted into the left and right bearing bush fixing holes 84. Next, as shown in FIGS. 9 and 10, the support shaft 73 is configured such that one small-diameter portion 75a is longer than the other small-diameter portion 75b. Into the bearing hole 85a of the bearing bush 85, at this time until the end of the large diameter portion 74 comes into contact with the bearing bush 85, then insert the shorter small diameter portion 75b between the side plates 82a of the bearing base 82, The other shaft hole bush 85 is inserted into the shaft hole 85a. In this state, when the support shaft 73 is biased toward the longer small-diameter portion 75a, it comes off. However, by making the structure around the right support portion 71 symmetrical to the structure around the left support portion, the support shaft 73 can be fixed to the bearing stand. That is, the bearing bush 85 is fitted into the bearing bush fixing hole 84 also around the right support bearing portion 71, and then the small diameter portions 75 a and 75 b of the support shaft 73 are inserted into the shaft hole 85 a of the shaft hole bush 85. Thereafter, in the left and right bearings, the large diameter portion 74 of the support shaft 73 is fitted into the support bearing portion 71 of the lid 10 from below, and the upper surface portion 81a of the arm member 81 is brought into contact with the large diameter portion 74 from below. The left side has a positional relationship of FIG. 10 and the right side has a symmetrical positional relationship with FIG.
Are fastened to the lid 10 together. By fixing in this manner, the support shaft 73 is 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 is connected to the arm member 8.
1 and is supported so as to be rotatable and vertically movable about a support shaft 73 provided at a rear portion thereof. As shown by a virtual line in FIG. When the lid 10 is closed so as to be in contact with the upper surface 21, the sealing function of the seal packing 15 causes
That is, the above-described vacuum chamber 30 is defined inside the lid 10. In such a configuration, the central portion of the rear vertical plate 83a of the frame 83 also serves as a stopper for restricting the opening operation of the lid 10. That is, the lid 10
When the arm member 81 is fully opened as shown by the solid line position in FIG. 1 or FIG. 12, the rotation of the lid 10 is restricted by the arm member 81 contacting the lower end of the vertical plate 83a.

As shown in FIG. 8 and FIG.
1, 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 rotation of the lid 10 in the opening direction. Etc. are attached. That is, one end of an elastic body 86 for urging the cover 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 cover 10 as described above. It is rotatably fixed. The other end of the elastic body 86 is preferably rotatably fixed to the upper front part of the main body 20. The elastic body 86 is formed of a coil spring in the present embodiment, but may be an elastic cord, a belt, or an elastic belt. 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. It is urged to rotate in the direction.

Further, below the arm member 81, a leading damper (buffer mechanism) 87 for generating resistance only to the rotation of the lid 10 in the opening direction is attached. Further, one end of a connecting rod member 89 is rotatably connected to the rotating body 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 center. The other end of the connecting rod member 89 is curved in an L-shape to form a projecting portion 89a. A guide pin 93 provided at a fixed position of a support member 92 hanging down from a substantially upper center 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 with opening and closing of the lid 10, Guided by the fixed position guide pin 93, a constant movement is always possible. Note that the guide pin 93 may be a roller that rotates, and in this case, the connecting rod member 89 is guided by the roller while rotating (rotating) the roller, and can always perform a constant movement. . In this way, the connecting rod member 89 changes its inclination posture with respect to the arm member 81 with the opening and closing operation of the lid 10, rotates the rotating body of the leading damper 87, and rotates the lid 10 in the opening direction. Act to create resistance to

An impulse heat seal mechanism for heat-sealing the bag-like package is provided at a front portion in the vacuum chamber 30. The impulse heat sealing mechanism includes a heat ray receiving portion 41 formed by projecting a silicon plate on 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 includes:
The O-ring 5 is attached to the upper surface
3, a housing 43 attached and fixed by screws 42, a cylinder 44 formed inside the lower part of the housing 43, and a piston 4 sliding up and down in the cylinder 44
5. One end of the cylinder rod 46 is screwed to the piston 45 via the cylinder cushion 57B, and the other end is penetrated through the housing 43 via 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 bar 46. Note that a cylinder cushion 57A is provided on the upper surface of the piston 45. The cylinder rod 4
A sealant is applied to a screw nut fixing portion between the piston 6 and the piston 45 to prevent airtight leakage. By disposing the piston 45 in the cylinder 44 as described above, a decompression chamber 50 is defined above the piston 45, and a pipe joint 48 is screw-connected to a side surface of the decompression chamber 50. The pipe b is connected to 48.

Further, in the decompression chamber 50, above the central portion, in order to make the vertical movement of the cylinder rod 46 smooth,
A cylindrical bush 49 is suspended from the housing 45,
A coil spring 52 for urging the piston 45 downward is provided so as to surround the outer periphery. Incidentally, 53, 55
Is an O-ring, 58 is a cylinder cover, and 59 is a C-shaped retaining ring for a hole for holding the cylinder cover 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 occurs between the upper and lower surfaces of the piston 45, and the pressure difference overcomes the elastic force of the coil spring 52 and is pushed upward. The seal bar 47 is configured to be pushed upward through a cylinder rod 46 connected to the piston 45. Further, the seal cylinder assembly 40 is arranged such that the seal bar 47 faces the heat ray receiving portion 41 when the lid 10 is closed. A sheet-like heater wire (not shown) is provided on the upper surface of the seal bar 47.
Is provided so that the heater wire is energized to generate heat.

In connection with the above configuration, the evacuation of the decompression chamber 50 is performed by switching the seal valve 26, and the timing is set so as to be performed after the evacuation of the vacuum chamber 30 is completed. I have. With this setting, the vacuum pressure in the vacuum chamber 30 causes the lid 10 to be attracted to the upper surface 21 of the main body, and then the seal bar 47 rises. In addition, the heat generated by the heater wire on the upper surface of the seal bar 47 rises based on a command from a control device (not shown), and the opening of the bag-like package 5 is sandwiched between the heat ray receiving portion 41 and the seal bar 47. It is set to be performed after being attached. The opening of the decompression chamber 50 to the atmosphere is performed by switching the seal valve 26, and the timing is set so that a predetermined time has elapsed after the vacuum chamber 30 was opened to the atmosphere. The area of the piston 45 is
The force generated by the pressure difference between the upper and lower surfaces 5 is set 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 such that the cover 10 can be pushed upward by the seal bar 47 to a position where the cover 10 is separated from the upper surface 21 of the main body.

Next, the operation of the vacuum packaging apparatus 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 10 is fully opened (during standby), the arm member 81 is pulled forward by the elastic body 86, and the lid 10 is fully opened as shown by a solid line in FIG. 1 or FIG. . When closing the lid 10, if the front part of the lid 10 is pressed by hand, the support shaft 73 rotates in the bearing bush 85 attached to the bearing base 82, and the lid 10 is rotated and closed. 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 to rotate counterclockwise as viewed in FIG.
As shown by a dotted line in FIG. 12, it hangs down in a state substantially parallel to the housing outer wall 20a. Further, with the closing operation of the lid 10, the arm member 81 is moved from the housing outer wall 2
0a, the elastic body 86 extends, and the arm member 81
The connecting rod member 89, which is connected to the support member 92, slides rightward as viewed in FIG. 12 and approaches the housing outer wall 20a while being guided by the slot 91 being fitted into the guide pin 93 of the support member 92. When the lid 10 is fully closed, the guide pin 93 is always at the position of the front end of the slot 91. By the operation of the arm member 81 and the connecting rod member 89, in the known leading damper 87 provided on the arm member 81, the rotating body connected to the connecting rod member 89 rotates. No resistance is produced with respect to the turning in the closing direction.

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

Next, when performing the vacuum packaging operation, when opening the lid 10, the user grips the handle 19 to
The lid 10 is lifted upward to open the lid 10 (standby state). Next, the user places the opening of the bag-like package 5 containing the packaged object 6 (see FIGS. 2 and 13) with the lid 10 opened in this manner, with the seal bar 47 in the heat sealing mechanism. (Mounting process). After the bag-like package 5 to be heat-sealed is placed in the vacuum chamber 30, the lid 10 is closed. In order to evacuate the vacuum chamber 30, the seal packing 15
, And the space between the lid 10 and the upper surface 21 of the main body is made airtight, and the vacuum chamber 30 waits for a negative pressure. At this time, the amount of bending of the seal packing 15 changes due to the amount of force that presses the lid 10, and the distance between the lower end surface of the lid 10 and the main body upper surface 21 changes. The attraction surface changes in synchronization with the change in the distance due to the elastic force of the elastic body 61, so that the magnet 62 does not hinder the lid 10 from closing. In addition, lid 1
In a state in which 0 is in contact with the upper surface 21 of the main body and is not pressed, that is, in a state in which the lid is closed and held only by the attraction force of the magnet 62, the seal packing 15 is in a substantially natural (uncompressed) state. The support shaft 73 of the lid 10 is shown in FIG.
It is above as 1, the gap L _B is formed thereunder.

When the cover 10 is closed in this manner, a switch (not shown) is turned on and the vacuum pump 22 is operated in conjunction with the operation of the opening and closing mechanism of the cover 10 in the closing direction.
Then, when the vacuum pump 22 operates, as shown in FIG. 2, the gas or the like in the vacuum chamber 30 passes through the deaeration port 29, the pipe d, the pipe c, and the pipe a, and
Suction (vacuum) by 2 When the inside of the vacuum chamber 30 has a negative pressure, a force is applied to the lid 10 by the negative pressure in the vacuum chamber 30 so as to draw toward the main body upper surface 21. At this time, the small diameter portions 75a, 75 of the support shaft 73 of the lid 10
The presence of a gap L _B between the b and the shaft hole 85a of the bearing bush 85, the support shaft 73 and the lid 10 is moved parallel to the upper surface of the main body 21 side while maintaining the parallel state with the upper surface of the main body 21, the seal The packing 15 bends and the airtightness between the lid 10 and the main body upper surface 21 is maintained strongly. At this time,
The magnet 62 of the lid closing and holding mechanism provided at the front of the lower end face of the peripheral edge of the lid 10 compresses the elastic body 61 upward in the deep recess 16, and the suction surface thereof is synchronized with the change of the lower surface of the seal packing 15. And is pushed up into the recess 16. Therefore, when the lid 10 is pulled toward the upper surface 21 of the main body, the magnet 62 does not interfere. When the magnet 62 is pushed upward, the mounting screw 63 for fixing 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 deaeration is sufficiently performed and the pressure in the vacuum chamber 30 is reduced to a predetermined pressure or less, the vacuum valve 2
3 is closed, the deaeration step is completed, and the seal valve 2 is closed.
6 is switched, and the decompression chamber 50 of the seal cylinder assembly 40 is communicated with the vacuum pump 22 via the pipes b and a. Then, by the operation of 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. 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 unit 41. Then, in the seal bar 47, the heater wire is energized to generate heat, and the bag-like package 5 sandwiched between the seal bar 47 and the heat ray receiver 41.
Is heat-sealed (heat-sealing step).

After a lapse of a predetermined time, the heater wire is turned off, the atmosphere release valve 24 is opened, and the inside of the vacuum chamber 30 is opened to the atmosphere. The package 5 is the package 6
(See FIG. 2), and the open-to-atmosphere step ends. Further, due to the pressure increase, the force for closing the lid 10 acting on the lid 10 during the deaeration step and the heat sealing step disappears. Further, for a predetermined time immediately after the vacuum chamber 30 recovers to the atmospheric pressure, the inside of the decompression chamber 50 of the seal cylinder assembly 40 is kept in a vacuum state. The force acts on the lid 10 via the seal bar 47 and the heat ray receiver 41.
Therefore, the lid 10 has a push-up force of the piston 45, a pulling force of the elastic body 86, and a seal packing 15.
The upward force due to the restoring force is acting. On the other hand, when the support shaft 73 is in the bearing bush 85 in FIG.
Until it reaches the position, keeping it parallel to the upper surface of the main body. At this time, the magnet 62 is
Since the support shaft 73 is elastically attached so as to be able to move up and down through the elastic body 61 through the elastic body 61, until the support shaft 73 reaches the position shown in FIG. 11, that is, until the seal packing 15 returns to the non-compressed state. The lid 10 is in contact with the upper surface of the main body, and the lid 10 is attracted to the upper surface of the main body by the attraction force of the magnet 62.

In such a state, the timing of opening the pressure in the pressure reducing chamber 50 of the seal cylinder assembly 40 to the atmosphere is set so as to be performed after a predetermined time has elapsed since the vacuum chamber 30 was released to the atmosphere as described above. Therefore, the lid 10 is further pushed up by the piston 45 via the seal bar 47 and the heat ray receiving portion 41. Then, the lid 10 is lifted until the magnet 47 stops contacting the upper surface of the main body, and a predetermined time elapses. As a result of this operation, after the completion of the heat sealing, the lid 10 is quickly lifted until it is separated from the upper surface 21 of the main body.
When the lid 10 is lifted until it is separated from the upper surface 21 of the main body, the closing and holding by the lid closing and holding mechanism including the magnet 62 as a component is released. Thereafter, the lid 10 is gradually opened by the elastic force of the elastic body 86 (opening operation of the lid 10).

The opening operation of the lid 10 is stopped when the arm member 81 comes into contact with the central portion 83a (see FIGS. 1 and 12) of the rear vertical plate of the frame 83 as a stopper.
And a completely open state as shown by the solid line in FIG. When the lid 10 is opened, the arm member 81 is substantially parallel to the housing outer plate 20a on the rear side of the main body 20.
Rotates clockwise as viewed in FIG. 12, and moves so as to incline at a predetermined angle with the rear housing outer plate 20a as shown by the solid line in FIG. Further, the connecting rod member 89 connected to the arm member 81 includes a supporting member 92 at the center of the main body 20 when the lid 10 is opened.
To the support member 92 around the guide pin 93.
The guide pin 92 moves away from the housing outer wall 20a such that the guide pin 92 moves relatively along the slot 91 while rotating counterclockwise (as viewed in FIG. 12). Leading damper 8 provided on arm member 81
7, the rotating body connected to the connecting rod member 89 includes the arm member 81 and the connecting rod member 89 associated with the opening of the lid 10.
And the resistance is added to the rotation of the lid 10 in the opening direction. For this reason, the lid 10 is slowly opened, and the arm member 81 does not vigorously abut against the center portion 83a 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 is reduced. Does not occur.

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-like shape formed by the heat ray receiving portion 41 and the seal bar 47 is formed. The pinch of the opening of the package 5 is released (pinch release), and the bag-like package 5 can be taken out.
When a predetermined time elapses after the vacuum chamber 30 is opened to the atmosphere, the seal valve 26 is switched, and the inside of the pressure reducing chamber 50 of the seal cylinder assembly 40 is communicated with the atmosphere through the atmosphere opening port 26a of the seal valve 26. The pressure of 50 rises to the atmospheric pressure, the piston 45 moves downward by the elastic force of the coil spring 52, the cylinder bar 46 and the seal bar 47 also move downward, and return to the initial standby state.

The present invention can be embodied with the following modifications. (1) The structure of the bearing portion is not limited to the structure described above. For example, the bearing bush 85
The shaft hole may be directly provided in the side plate 82a of the bearing base 82 without employing the above. (2) According to the invention described in claim 1, the lid 10
Is not limited to the above embodiment. For example, a suction cup may be provided instead of the magnet 62, or a suction cup portion may be formed in a part of the seal packing 15.

[0035]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the invention, when the vacuum packaging apparatus is at rest, the lid is held in the closed state by the lid closing and holding mechanism, so that the inside of the vacuum chamber does not become unsanitary. Further, when the heat sealing is completed, the closing and holding of the lid by the lid closing and holding mechanism is quickly released by the seal cylinder mechanism, and the lid is automatically opened, so that no special releasing mechanism is required. Then, the lid can be automatically opened.

According to the second aspect of the present invention, in addition to the above-described effects, the lid closing / holding mechanism is constituted by magnets, so that the holding mechanism can be manufactured at low cost and with high durability. .

According to the third aspect of the present invention, in addition to the above-described effects, the support shaft of the lid is vertically movably mounted, and the lid is pulled toward the upper surface of the main body during evacuation to compress the seal packing. Thus, the airtightness between the lid and the upper surface of the main body can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a vacuum packaging apparatus according to an embodiment of the present invention.

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

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

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a sectional view taken along line VV in FIG. 3;

FIG. 6 is a view showing a structure for mounting a magnet of the vacuum packaging apparatus shown in FIG. 1;

FIG. 7 is an enlarged view around a mounting screw in FIG. 6;

FIG. 8 is a structural view of a support bearing portion of the lid shown in FIG. 1;

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

FIG. 10 is a sectional view taken along line XX in FIG. 8;

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

FIG. 12 is a view for explaining a lid opening / closing mechanism shown in FIG. 3;

13 is an explanatory diagram 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: Upper surface of main body, 29: Degas port, 30: Vacuum chamber, 40
... Seal cylinder assembly, 41 ... Heat 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 holes, 63 mounting screws, 63a
... Heads of mounting screws, 64, 66 ... Flat washers, 65 ... Cylindrical spacer, 67 ... Nut, 71 ... Support receiving part, 72 ...
Screw holes, 73: support shaft, 74: large diameter portion, 75a, 75b ...
Small-diameter portion, 81: arm member, 81a: upper surface portion, 81b: side surface portion, 82: bearing base, 82a: side plate of the bearing base, 83: frame, 84: bearing bush fixing hole, 85: bearing bush, 85a: shaft Hole, 86 ... elastic body.

Claims (3)

[Claims] 1. A main body and a lid, a support shaft is provided at a rear portion of the lid, and the support shaft is rotatably supported by a bearing provided at a rear portion of the upper surface of the main body, and the upper surface of the main body is formed. It is openable and closable, and a seal packing for securing the confidentiality between the upper surface of the main body and the lid is provided all around the peripheral lower end surface of the lid, and between the lid and the upper surface of the main body when the lid is closed. A vacuum chamber is defined, a seal bar moved up and down by a seal cylinder mechanism provided inside the main body is protruded from the upper surface of the main body, and a heat ray receiving portion is provided on a lower surface of the lid so as to face the seal bar. At the time of heat sealing, the bag-like package is sandwiched and heat-sealed by the seal bar and the heat-ray receiving portion, and the lid is constantly urged in the opening direction by an elastic body to complete the heat sealing. Sometimes, the lid is automatically opened, In the apparatus, the lid is held in a closed state when the lid is closed and brought into contact with the upper surface of the main body, on the lower end surface of the peripheral edge of the lid, and the upward force is applied via the lid to cause the upward force to act. A lid closing / holding mechanism for releasing the closing / holding is provided, and for a predetermined time from the time when the heat sealing is completed and the vacuum chamber is opened to the atmosphere, the seal bar of the seal cylinder mechanism is used through the heat-ray receiving portion. A vacuum packaging apparatus characterized in that an upward force is applied to the lid to lift the lid away from the upper surface of the main body, and release the lid from being closed and held by the lid closing and holding mechanism. 2. The vacuum packaging apparatus according to claim 1, wherein a magnet is attached to a front edge of a lower end surface of the lid as the lid closing and holding mechanism. 3. When the pressure in the vacuum chamber formed by closing the upper surface of the main body with the lid becomes negative, the lid is pulled toward the upper surface of the main body while maintaining the parallel state with the upper surface of the main body. 2. The support shaft according to claim 1, wherein the support shaft is vertically movable so that the seal packing is compressed.
Or the vacuum packaging apparatus according to 2.