JP7356294B2 - vacuum packaging machine - Google Patents

Description

The present invention degasses the inside of the chamber using a vacuum pump to create negative pressure, and seals the opening periphery of the packaging bag housed in the chamber with a sealing device, thereby leaving the inside of the packaging bag in a deaerated state. The present invention relates to a vacuum packaging machine that seals the packaging.

Patent Document 1 listed below discloses a vacuum packaging machine that vacuum-packs packaging bags containing items to be packaged, such as foodstuffs and cooked foods. This vacuum packaging machine includes a chamber provided at the top of the casing to form an airtight space for accommodating the packaging bag, and a sealing device provided in the chamber to seal the opening edge of the packaging bag by heat welding. The device is equipped with a vacuum pump located at the bottom of the casing to evacuate the inside of the chamber and create a negative pressure. The chamber includes a shallow box-shaped chamber base with an open top, and a plate-shaped chamber cover that opens and closes the upper side of the chamber base. The sealing device includes a lower block that is movable up and down on the chamber base, an upper block that is installed on the lower surface of the chamber cover, a heater that is installed on the upper surface of the lower block, and a lower block that moves up and down. Equipped with a lifting mechanism.

When vacuum packaging a packaging bag with this vacuum packaging machine, the packaging bag is placed on the chamber base so that the opening periphery of the packaging bag rests on the upper side of the lower block, and the top opening of the chamber base is closed with a chamber cover. After that, run the vacuum packaging program. When the vacuum packaging program is executed, the inside of the chamber is evacuated by the vacuum pump until a predetermined degree of vacuum is reached, and the inside of the packaging bag inside the chamber is also evacuated. The degassed packaging bag is welded by heating with a heater while the opening peripheral portion is sandwiched between the lower and upper blocks, and the packaging bag is sealed in the degassed state.

Japanese Patent Application Publication No. 2016-150757

When vacuum packaging a packaging bag with the above vacuum packaging machine, the packaging bag is placed on the chamber base so that the opening periphery of the packaging bag rests on the upper side of the lower block. When the upper opening of the chamber base is closed by the chamber cover, the opening periphery of the packaging bag may shift on the upper side of the lower block due to the wind generated when the chamber cover is closed. If the opening periphery of the packaging bag shifts above the lower block, it is necessary to open the chamber cover again and correct the position of the opening periphery of the packaging bag. Additionally, if the opening periphery of the packaging bag is deviated above the lower block and the opening periphery of the packaging bag is welded using a heater, the welded part cannot be made parallel to the opening edge of the packaging bag, resulting in poor appearance. Sometimes. Furthermore, if the opening periphery of the packaging bag cannot be welded over the entire length in the width direction, the opening periphery of the packaging bag may not be completely sealed, and the packaging bag may not be sealed. An object of the present invention is to prevent the opening peripheral edge of the packaging bag from shifting above the lower block.

In order to solve the above problems, the present invention provides a chamber in which a sealed space for accommodating a packaging bag is formed by closing the upper side of a chamber base with a chamber cover so as to be openable and closable, and a packaging bag provided in the chamber. The sealing device is equipped with a sealing device that seals the packaging bag by sealing the opening periphery of the chamber, and a vacuum pump that evacuates the sealed space inside the chamber to create a negative pressure. Upper and lower blocks are provided on the sides and extend in a second direction perpendicular to the first direction connecting one side and the other side as a longitudinal direction, and the upper and lower blocks A vacuum packaging machine that seals the opening periphery of a packaging bag while the opening periphery of the packaging bag is held between the upper and lower blocks by the blocks, wherein A bracket is removably attached to the upper surface of the slightly adhesive tape, which has a slightly adhesive tape on the upper surface that can be peeled off and adheres to the periphery of the opening of the bag, and the side edge of the lower block side of the slightly adhesive tape is A vacuum packaging machine characterized by being sandwiched between a side block and a bracket .

In the vacuum packaging machine configured as described above, on the side of the lower block in the first direction, there is a slightly adhesive tape on the upper surface which has a slightly adhesive surface that removably adheres to the opening periphery of the packaging bag. A bracket attached to the lower block is removably provided, and the side edge of the slightly adhesive tape on the lower block side is held between the lower block and the bracket. On the side of the lower block in the first direction, there is provided a slightly adhesive tape having a slightly adhesive surface on the upper surface that releasably adheres to the opening periphery of the packaging bag. When placed on top of the lower block, the opening periphery of the packaging bag is pressed against the slightly adhesive tape provided on the lower block to temporarily adhere it, so that the opening periphery of the packaging bag can be used when closing the chamber cover. This prevents the upper part of the lower block from shifting due to the wind that occurs. As a result, the opening periphery of the packaging bag is securely sealed while being held between the lower block and the upper block so as not to shift, and the packaging bag can be reliably sealed. . In addition, since the slightly adhesive tape releasably adheres to the periphery of the opening of the packaging bag, after the periphery of the opening of the packaging bag has been sealed, it can be peeled off from the slightly adhesive tape without damaging the packaging bag. be able to. Furthermore, since the side edge of the slightly adhesive tape on the lower block side is sandwiched between the lower block and the bracket, it is possible to prevent the slightly adhesive tape from peeling off from the side edge on the lower block side in the first direction. can.

In the vacuum packaging machine configured as described above, it is preferable that the bracket is provided with a holding plate on the opposite side of the lower block in the first direction to hold the side edge of the slightly adhesive tape on the opposite side of the lower block. preferable. In this case, the slightly adhesive tape can be made difficult to peel off from the side edge on the opposite side of the lower block in the first direction.

It is a perspective view of the vacuum packaging machine of this embodiment. FIG. 2 is a perspective view of FIG. 1 with the chamber cover opened. It is an AA sectional view. It is a BB sectional view. It is a schematic diagram of a vacuum packaging machine. It is a perspective view seen from the rear side of a lower block. FIG. 6 is an exploded perspective view of FIG. 5 with the bracket and presser plate removed from the lower block. FIG. 2 is a block diagram of a control device. 3 is a flowchart of a packaging program.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the vacuum packaging machine of this invention is described with reference to an accompanying drawing. As shown in FIGS. 1 to 4, the vacuum packaging machine 10 of the present invention includes a chamber 20 provided in the upper part of the casing 11, and a sealing device 30 that seals the opening periphery of the packaging bag within the chamber 20. A vacuum pump 50 is provided at the lower part of the casing 11 below the chamber 20 to evacuate the inside of the chamber 20 and create a negative pressure. In the following description, one side of the claimed chamber 20 will be referred to as the front (front side), the other side will be referred to as the rear (rear), and the first direction will be referred to as the front and rear. The description will be made as a front-back direction connecting the two directions, and a second direction orthogonal to the first direction and the horizontal direction as a left-right direction.

As shown in FIGS. 1 to 4, the casing 11 has a substantially rectangular parallelepiped shape, and a chamber 20 is provided in the upper part of the casing 11. The chamber 20 includes a chamber base 21 and a chamber cover 22 provided on the upper part of the casing 11, and by closing the upper side of the chamber base 21 with the chamber cover 22 so as to be openable and closable, a sealed space is formed inside to accommodate the packaging bag. ing.

As shown in FIG. 2, the chamber base 21 has a shallow box shape with an open upper surface and a substantially rectangular parallelepiped shape, and is formed by press working a sheet metal member such as stainless steel. As shown in FIG. 3, the front part of the chamber base 21 is formed with a step 21a that is shallower than other parts, and above the step 21a is a lower block constituting the sealing device 30. 31 is provided so as to be movable up and down.

As shown in FIG. 4, the parts of the chamber base 21 excluding the stepped part 21a are curved so that the center part in the left and right direction is the lowest, and the packaging bag accommodated in the chamber 20 is placed at the lowest left and right parts. It is easier to place it in the center of the direction. By placing the packaging bag at the center in the left-right direction within the chamber 20, the opening peripheral portion of the packaging bag is placed on the center portion of the lower block 31 in the left-right direction.

As shown in FIGS. 1 and 2, the chamber cover 22 is a lid made of a transparent material such as a pressure-resistant acrylic material, polycarbonate material, or polyethylene terephthalate, which closes the top opening of the chamber base 21 in an openable and closable manner. It forms a sealed space between it and the chamber base 21 for accommodating the packaging bag. The rear end portion of the chamber cover 22 is rotatably supported by the rear end portion of the casing 11 so as to be rotatable around a horizontal axis, and the front portion of the chamber cover 22 is rotatable up and down. As shown in FIG. 1, when the chamber cover 22 is in the horizontal position, it is in a closed position where it closes the upper opening of the chamber base 21. As shown in FIG. 2, when the front portion of the chamber cover 22 is rotated upward, the chamber cover 22 is placed in a tilted position and placed in an open position where the upper surface of the chamber base 21 is opened.

As shown in FIGS. 1 and 4, the chamber cover 22 includes flat portions 22a having a flat plate shape on both sides in the left and right direction, and a protrusion portion 22b that protrudes upward in the center in the left and right direction. It is equipped with Further, a rising portion 22c rising from the flat portion 22a to the protruding portion 22b is formed between the flat portion 22a and the protruding portion 22b.

The lower surface of the flat portion 22a has a height such that it comes into contact with the upper edge of the chamber base 21, and covers both left and right sides of the chamber base 21. As shown in FIG. 4, the rising portion 22c is an obliquely inclined surface that rises from the flat portion 22a as it approaches the protruding portion 22b. It has a function of arranging the packaged items in a tall packaging bag at the center in the left-right direction.

As shown in FIGS. 1 and 4, the protrusion 22b of the chamber cover 22 allows the packaging bag to hold a tall object when placed in the center of the chamber base 21 in the left-right direction. It has a function of making it difficult for the chamber cover 22 to come into contact with the chamber cover 22. The packaging bag accommodated in the chamber 20 is easily placed in the center in the left-right direction due to the curved surface of the bottom wall of the chamber base 21. When placed at the center in the left-right direction, the protrusion 22b of the chamber cover 22 can accommodate a packaging bag containing a tall object to be packaged.

As shown in FIGS. 2 to 4, a rubber packing 23 is provided as a sealing member on the peripheral edge of the lower surface of the chamber cover 22. A space between a chamber base 21 and a chamber cover 22 is airtightly sealed.

As shown in FIGS. 2 and 3, a gas spring 12 is provided at the rear of the casing 11. The gas spring 12 biases the front portion of the chamber cover 22 upward, and biases the chamber cover 22 to an open position where it is released from the chamber base 21. A stopper 13 is provided at the front end of the right side of the casing 11 so as to be rotatable around a horizontal axis. It has a function of holding the top opening in a closed position.

As shown in FIG. 5, a cover opening/closing detector 14 is provided at the rear of the casing 11 to detect whether the chamber cover 22 is closed. The cover opening/closing detector 14 uses a proximity switch such as a reed switch, and a magnet 15 is provided at the rear of the chamber cover 22 to allow the cover opening/closing detector 14 to detect the closed state of the chamber cover 22. When the chamber cover 22 is in the closed position of closing the upper opening of the chamber base 21, the magnet 15 approaches the cover opening/closing detector 14, and the cover opening/closing detector 14 outputs an on signal. When the chamber cover 22 is in the open position that opens the top opening of the chamber base 21, the magnet 15 is separated from the cover opening/closing detector 14, and the cover opening/closing detector 14 outputs an off signal.

As shown in FIGS. 3 and 5, a sealing device 30 is provided at the front portion (one side in the horizontal direction) of the chamber 20. As shown in FIGS. The sealing device 30 seals the opening periphery of the packaging bag housed in the chamber 20 by thermal welding to seal the packaging bag. The sealing device 30 includes lower and upper blocks 31 and 32 that sandwich the opening periphery of the packaging bag. The lower block 31 is made of a square pipe member made of aluminum, and is supported above the stepped portion 21a of the chamber base 21 so as to be detachable and movable up and down. A strip-shaped heater 33 made of nichrome material is provided on the upper surface of the lower block 31. The upper block 32 is made of an elastically deformable silicone block, and is attached to the lower front part of the chamber cover 22 at a position opposite to the upper side of the lower block 31.

As shown in FIGS. 3 and 5, a pair of left and right lifting mechanisms 34 are provided on the lower surface of the stepped portion 21a of the chamber base 21 to move the lower block 31 up and down. Each lifting mechanism 34 includes a support shaft 35 that passes through the bottom wall of the stepped portion 21a of the chamber base 21, and an elevator cylinder 36 that moves the support shaft 35 up and down. As shown in FIG. 5, a flange portion 37 is provided at the axially intermediate portion of the support shaft 35, and the flange portion 37 airtightly partitions the inside of the lifting cylinder 36 into an upper space 36a and a lower space 36b. There is. A spring member 38 is interposed around the outer periphery of the support shaft 35 in the upper space 36a of the lifting cylinder 36, and the spring member 38 biases the support shaft 35 downward via the collar portion 37.

As shown in FIGS. 6 and 7, a slightly adhesive tape 40 is provided at the rear of the lower block 31, and the slightly adhesive tape 40 is placed on the rear side of the lower block 31 by a bracket 41. . The slightly adhesive tape 40 removably adheres to the opening periphery of the packaging bag placed on the upper side of the lower block 31 to prevent the opening periphery of the packaging bag from shifting above the lower block 31. . The slightly adhesive tape 40 is a strip-shaped tape wound into a roll, and is pulled out along the longitudinal direction of the lower block 31 for use. The slightly adhesive tape 40 has an adhesive layer using a silicone adhesive that removably adheres to the bracket 41 on the lower surface of the glass cloth sheet, and uses a silicone resin that removably adheres to a resin packaging bag on the upper surface. Has a slightly adhesive layer. The slightly adhesive layer on the upper surface of the slightly adhesive tape 40 is a slightly adhesive surface made of silicone resin, and allows a packaging bag made of a resin material to be peeled and adhered many times. Since the slightly adhesive tape 40 is disposed on the rear side of the lower block 31 provided with the heater 33, it has heat resistance corresponding to the transfer of the heat of the heater 33. The adhesive strength of the slightly adhesive tape 40 is 3N/25mm so as to be able to peel off a resin packaging bag, but it is not limited to this. It may be adhesive.

As shown in FIGS. 6 and 7, the bracket 41 is for disposing the slightly adhesive tape 40 at the rear of the lower block 31, and like the lower block 31, extends along the left-right direction. As shown in FIG. 7, the bracket 41 includes a horizontal portion 41a arranged on the rear side of the lower block 31, and a horizontal portion 41a that is bent downward from the front edge of the horizontal portion 41a along the rear surface of the lower block 31. The vertical section 41b is provided with an L-shaped sheet metal member whose vertical cross-sectional shape along the front-rear direction is upside down. The bracket 41 is detachably attached to the rear surface of the lower block 31 by two screws 42 inserted through the vertical portion 41b. The bracket 41 is slightly shorter than the length of the lower block 31 in the left-right direction, and has a length that allows most of the opening periphery of the packaging bag placed on the upper side of the lower block 31 to be placed thereon.

As shown in FIG. 7, the adhesive layer on the lower surface of the slightly adhesive tape 40 is removably pasted on the upper surface of the horizontal portion 41a, and the portion of the slightly adhesive tape 40 that is pasted on the upper surface of the horizontal portion 41a serves as a bag adhesive holding portion 40a that adheres and holds the opening periphery of the packaging bag with a weak force. The bag adhesive holding portion 40a of the slightly adhesive tape 40 is attached to the upper surface of the horizontal portion 41a at a position away from the lower block 31 from the center in the width direction. The slightly adhesive tape 40 is bent downward from the upper surface of the horizontal portion 41a to the boundary portion with the lower block 31 along the front surface of the vertical portion 41b, and the bent portion is removably pasted on the front surface of the vertical portion 41b. It is being The side edge portion 40b of the slightly adhesive tape 40 on the lower block 31 side in the width direction is sandwiched between the front surface of the vertical portion 41b and the rear surface of the lower block 31, and 31 so that it cannot be turned over.

As shown in FIG. 7, the slightly adhesive tape 40 is bent downward from the upper surface of the horizontal portion 41a at the rear end opposite to the lower block 31, and then bent downward along the front surface of the vertical portion 41b. The portion bent from the upper surface of the horizontal portion 41a is releasably attached to the lower surface of the horizontal portion 41a and the front surface of the vertical portion 41b. A presser plate 43 is provided on the rear side of the vertical portion 41b of the bracket 41, and the presser plate 43 is attached to the rear surface of the lower block 31 via the bracket 41 (with the bracket 41 in between) using two screws 42 together with the bracket 41. is removably attached to. The side edge 40c of the slightly adhesive tape 40 on the opposite side to the lower block 31 in the width direction is sandwiched between the rear surface of the vertical portion 41b and the front surface of the presser plate 43, and is sandwiched between the rear surface of the vertical portion 41b and the presser plate 43. 43 so that it cannot be turned over.

The bag adhesive holding part 40a of the slightly adhesive tape 40 repeatedly sticks and peels the opening periphery of the packaging bag, so that the slightly adhesive layer on the top surface is peeled off and the opening periphery of the packaging bag is not stuck to the bag adhesive holding part 40a. It may become. Further, the bag adhesive holding part 40a uses only a part of the slightly adhesive tape 40 in the width direction, and the slightly adhesive layers on both sides of the bag adhesive holding part 40a in the width direction remain with sufficient adhesive force. . Therefore, when the slightly adhesive layer on the upper surface of the bag adhesive holding part 40a is peeled off and the adhesive strength is reduced, the screws 42 are removed from the lower block 31, and the bracket 41 and the presser plate 43 are removed from the lower block 31. Peel off the slightly adhesive tape 40 from the removed bracket 41, shift the slightly adhesive tape 40 in the width direction, and stick the part where the slightly adhesive layer is not peeled off again to the horizontal part 41a of the bracket 41 as a new bag adhesive holding part 40a. The bracket 41 to which the slightly adhesive tape 40 is attached and the pressing plate 43 are attached to the lower block 31 with screws 42. In this way, by attaching the slightly adhesive tape 40 to the bracket 41 while shifting it in the width direction, the other part in the width direction where the slightly adhesive layer is not peeled off can be used multiple times as the bag adhesive holding part 40a. , one sheet of slightly adhesive tape 40 can be used for a long time.

As shown in FIG. 5, a vacuum pump 50 is provided in the lower part of the casing 11. The vacuum pump 50 mainly sucks the inside of the chamber 20, exhausts the air in the closed space inside the chamber 20, and suctions the inside of the chamber 20 under negative pressure. A suction pipe (suction path) 51 connecting the vacuum pump 50 and the chamber 20 is provided in the casing 11, and a vacuum valve 52 is interposed in the suction pipe 51. Air within the chamber 20 can be drawn into the vacuum pump 50 by opening the vacuum valve 52.

An outside air introduction pipe 53 that introduces outside air between the chamber 20 and the vacuum valve 52 is connected to the suction pipe 51, and the outside air introduction pipe 53 has a first pipe section 53a and a first pipe section 53a branched from the first pipe section 53a. 2 pipe portions 43b. First and second outside air introduction valves 44 and 45 for opening and closing the first and second pipe portions 53a and 53b are interposed. The first outside air introduction valve 54 is formed to have a larger diameter than the second outside air introduction valve 55, and when the first outside air introduction valve 54 is opened, outside air is quickly introduced into the chamber 20, and the second outside air introduction valve 55 is opened. When opened, outside air is slowly introduced into the chamber 20.

A pressure detection tube 56 is connected to the suction tube 51 via the first tube portion 53a of the outside air introduction tube 53, and the pressure detection tube 56 is provided with a vacuum gauge 57 for detecting the pressure in the chamber 20. When the chamber 20 is not evacuated by the vacuum pump 50, the pressure inside the chamber 20 detected by the vacuum gauge 57 is 100 kPa (abs), which is the same as atmospheric pressure, and the degree of vacuum at this time is 0%. When the inside of the chamber 20 is evacuated to a negative pressure by the vacuum pump 50 and the pressure inside the chamber detected by the vacuum gauge 57 is 0 kPa (abs), the degree of vacuum is 100%. Although it is the pressure inside the chamber 20 that is directly detected by the vacuum gauge 57, in the following explanation, the pressure detected by the vacuum gauge 57 will be replaced with the degree of vacuum P inside the chamber 20.

A cylinder pipe 58 branches from the suction pipe 51 between the vacuum pump 50 and the vacuum valve 52, and the cylinder pipe 58 is connected to the upper space 36a of the lifting cylinder 36. A three-way valve 59 is installed in the cylinder pipe 58. Two ports of the three-way valve 59 are connected to the vacuum pump 50 side and the lifting cylinder 36 side of the cylinder pipe 58, and the remaining one port of the three-way valve 59 is connected to the outside air. It is open to the side. When the vacuum pump 50 is operated with the vacuum pump 50 side of the three-way valve 59 communicating with the lifting cylinder 36 side, the upper space 36a of the lifting cylinder 36 becomes negative pressure, and the support shaft 35 resists the biasing force of the spring member 38. and rise. When the elevating cylinder 36 side of the three-way valve 59 and the outside air side are brought into communication, the upper space 36a of the elevating cylinder 36 is prevented from becoming negative pressure, and the support shaft 35 is lowered by the biasing force of the spring member 38.

As shown in FIGS. 3 and 5, a bulge detection section 60 is provided in the chamber 20 to detect the bulge of the packaging bag accommodated therein. The bulge detection unit 60 detects a detection plate 61 rotatably supported around a horizontal axis at the front of the lower surface of the chamber cover 22, a magnet 62 fixed to the rear end of the detection plate 61, and the position of the detection plate 61. It is equipped with a bulge detector 63 consisting of a proximity switch such as a reed switch.

The detection plate 61 is in the shape of a strip extending in the second direction, similar to the lower and upper blocks 31 and 32. The detection plate 61 is disposed on the lower surface of the chamber cover 22 immediately behind the upper block 32, and is supported so as to be rotatable around a horizontal axis so that the rear side thereof can move up and down. A magnet 62 is fixed to the rear end of the left end of the detection plate 61, and the magnet 62 moves up and down as the detection plate 61 rotates. When the packaging bag housed in the chamber 20 is not inflated, the detection plate 61 is tilted diagonally downward, and the magnet 62 at the rear end of the detection plate 61 is located at the lower part (lower position) in the chamber 20 (Fig. 3 and shown by solid lines in FIG. 5). When the packaging bag housed in the chamber 20 is inflated, the detection plate 61 is lifted and rotated by the inflated packaging bag, and the magnet 62 at the rear end of the detection plate 61 is located at the upper part of the chamber 20 (upper position). (Indicated by the two-dot chain line in FIGS. 3 and 5).

The bulge detector 63 detects the bulge of the packaging bag by detecting the position of the magnet 62 at the rear end of the detection plate 61, which rotates upward when the packaging bag swells. The bulge detector 63 is arranged outside the chamber base 21 at a position facing the magnet 62 of the detection plate 61 which is in the upper position. When the packaging bag is not inflated and the magnet 62 of the detection plate 61 is in the lower position, the bulge detector 63 outputs an off signal because the magnet 62 in the lower position is spaced apart. When the packaging bag is inflated and the magnet 62 of the detection plate 61 is in the upper position, the bulge detector 63 outputs an on signal as the magnet 62 in the upper position approaches.

The vacuum packaging machine 10 is equipped with a control device 70, and as shown in FIG. It is connected to second outside air introduction valves 44 and 45, a vacuum gauge 57, a three-way valve 59, a bulge detector 63, and an operation panel 71 provided on the front surface of the casing 11. The control device 70 has a microcomputer (not shown), and the microcomputer includes a CPU, RAM, ROM, and timer (all not shown) that are connected to each other via a bus.

The control device 70 includes a packaging program in the ROM for sealing the packaging bag in a deaerated state. In the packaging program, the inside of the chamber 20 is made negative to a predetermined pressure by the vacuum pump 50, the packaging bag accommodated in the chamber 20 is deaerated, and then the opening periphery of the packaging bag is sealed by the sealing device 30. , is a program for sealing a packaging bag in a deaerated state.

A plurality of packaging programs are set in which the degree of vacuum in the chamber 20 and the manner in which the first and second outside air introduction valves 44 and 45 are opened are different depending on the temperature of the food to be packed in the packaging bag. As an example of a packaging program, a packaging program when the food is at room temperature (low temperature) will be specifically described. Before the packaging program is executed, the vacuum valve 52 and the second outside air introduction valve 55 are in a closed state, and the lifting cylinder 36 side of the three-way valve 59 and the outside air side are in communication (the vacuum pump 50 side is in a closed state). ).

An object to be packaged, such as a food ingredient or a cooked item, is placed in a packaging bag, and the packaging bag is placed on a chamber base 21 so that the opening peripheral part of the packaging bag rests on the upper side of a lower block 31. The opening periphery of the packaging bag is pressed against the bag adhesive holding part 40a of the slightly adhesive tape 40 provided at the rear of the lower block 31 to make it stick temporarily, and the opening periphery of the packaging bag is moved above the lower block 31. Make sure not to. The user operates the operation panel 71 to select a packaging program for when the food is at room temperature, and waits for execution of the selected packaging program.

As shown in FIG. 9, in step 101, the control device 70 determines whether an ON signal is input from the cover opening/closing detector 14, and determines whether the chamber cover 22 is closed. When the chamber cover 22 is not closed, the magnet 15 is not close to the cover opening/closing detector 14, so the cover opening/closing detector 14 outputs an off signal to the controller 70, and the controller 70 outputs an OFF signal to the controller 70 in step 101. It repeatedly makes a "NO" decision and waits. When the chamber cover 22 is closed and the magnet 15 approaches the cover open/close detector 14, the cover open/close detector 14 outputs an ON signal to the control device 70, and the control device 70 determines "YES" in step 101. Proceed to step 102. In step 102, the control device 70 opens the vacuum valve 52, closes the first outside air introduction valve 54, and operates the vacuum pump 50, so that the inside of the chamber 20 is evacuated by the vacuum pump 50 and becomes negative pressure. go.

In step 103, the control device 70 repeatedly determines whether the degree of vacuum P in the chamber 20 detected by the vacuum gauge 57 has reached a preset degree of vacuum Px or more (below a predetermined pressure). When the pressure in the chamber 20 gradually decreases and the degree of vacuum P in the chamber 20 detected by the vacuum gauge 57 reaches a preset degree of vacuum Px or more (below a predetermined pressure), the control device 70 performs the following in step 103. If the answer is "YES", the process proceeds to step 104. In step 104, the control device 70 closes the vacuum valve 52 to stop degassing the chamber 20, and proceeds to step 105.

When the inside of the chamber 20 reaches the predetermined pressure Px or higher (lower than the predetermined pressure) and the inside of the packaging bag is also degassed, the control device 70 controls the three-way valve 59 on the lifting cylinder 36 side in step 105. It communicates with the vacuum pump 50 side (the outside air side is closed). The upper space 36a of the lifting cylinder 36 is made negative pressure by the vacuum pump 50, the support shaft 35 rises against the biasing force of the spring member 38, and the lower block 31 rises due to the rising support shaft 35. The lower block 31 is pressed against the upper block 32 by the rising support shaft 35, and the opening periphery of the packaging bag is held between the lower block 31 and the upper block 32. In step 106, the control device 70 energizes the heater 33 to generate heat, and the peripheral edge of the opening of the packaging bag is closed by heat welding, and the packaging bag is sealed in a deaerated state (vacuum state).

In step 107, the control device 70 stops the operation of the vacuum pump 50 and opens the first outside air introduction valve 54, and in step 108, communicates the lifting cylinder 36 side of the three-way valve 59 with the outside air side (the vacuum pump 50 side is closed). The inside of the chamber 20 is returned to atmospheric pressure by the outside air introduced from the first outside air introduction valve 54, and the chamber cover 22 is opened by the biasing force of the gas spring 12 without being sucked under negative pressure. Furthermore, by opening the lifting cylinder 36 side and the outside air side of the three-way valve 59, outside air is introduced into the upper space 36a of the lifting cylinder 36, the negative pressure state is released, and the support shaft 35 is moved by the spring member 38. The lower block 31 is moved downward by the force, and the lower block 31 is separated from the upper block 32, and the peripheral edge of the opening of the packaging bag is released from being held between the lower and upper blocks 31 and 32. In this way, the packaging bag is sealed in a deaerated state (vacuum state).

In the vacuum packaging machine 10 configured as described above, the rear part (the side part in the first direction) of the lower block 31 has a slightly adhesive surface on the upper surface that peelably adheres to the opening periphery of the packaging bag. A slightly adhesive tape 40 is provided. When the packaging bag is laid down on the chamber base 21 so that the opening periphery of the packaging bag rests on the upper side of the lower block 31, the slightly adhesive tape 40 on the rear of the lower block 31 wraps the opening periphery of the packaging bag. Press it against the bag adhesive holding part 40a to make it stick temporarily. The opening periphery of the packaging bag is releasably adhered to the bag adhesive holding portion 40a of the slightly adhesive tape 40, and the opening periphery of the packaging bag does not shift above the lower block 31 due to the wind generated when the chamber cover 22 is closed. It becomes like this.

As a result, the lower block 31 is raised so as to be pressed against the upper block, the opening periphery of the packaging bag is sandwiched between the lower and upper blocks 31 and 32, and then the heater 33 is energized and sealed by thermal welding. In this case, the opening periphery of the packaging bag is not incompletely sealed by heat welding only a part of it in the width direction, and the opening periphery of the packaging bag is completely heat welded over the entire length in the width direction by the heater 33. will be sealed in. In addition, since the slightly adhesive tape 40 removably adheres to the opening periphery of the packaging bag, after the opening periphery of the packaging bag has been sealed, the slightly adhesive tape 40 can be applied without damaging the packaging bag. It can be peeled off. Furthermore, when the opening end of the packaging bag is placed parallel to the lower block 31, the part welded by the heater 33 becomes parallel to the opening end of the packaging bag, and the welded part becomes unattractive and defective. The occurrence can be suppressed.

A bracket 41 with a slightly adhesive tape 40 pasted on the upper surface is removably provided at the rear (side part in the first direction) of the lower block 31, and A side edge portion 40b on the lower block 31 side is held between the lower block 31 and the vertical portion 41b of the bracket 41. This makes it difficult for the slightly adhesive tape 40 to peel off from the side edge 40b on the lower block 31 side.

The bracket 41 is provided with a pressing plate 43 on the side opposite to the lower block 31 in the front-rear direction (first direction), which holds the side edge 40c of the slightly adhesive tape 40 opposite to the lower block 31. . Thereby, the slightly adhesive tape 40 can be made difficult to peel off from the side edge 40c on the opposite side to the lower block 31.

The bag adhesive holding part 40a of the slightly adhesive tape 40 repeatedly sticks and peels the opening periphery of the packaging bag, so that the slightly adhesive layer on the top surface is peeled off and the opening periphery of the packaging bag is not stuck to the bag adhesive holding part 40a. become. By shifting the band-shaped slightly adhesive tape 40 in the width direction and pasting the part where the slightly adhesive layer is not peeled off as a new bag adhesive holding part 40a to the horizontal part 41a of the bracket 41, the slightly adhesive layer of the slightly adhesive tape 40 can be removed. The other part in the width direction that has not been peeled off can be used multiple times as the bag adhesive holding part 40a, and one sheet of slightly adhesive tape 40 can be used for a long time.

In the above embodiment, the bracket 41 to which the slightly adhesive tape 40 is attached is provided at the rear of the lower block 31 in the front-rear direction (first direction), but the present invention is not limited to this. The bracket 41 to which the bracket 41 is attached may be provided at the front part of the lower block 31 in the front-rear direction (first direction).

DESCRIPTION OF SYMBOLS 10... Vacuum packaging machine, 20... Chamber, 21... Chamber base, 22... Chamber cover, 30... Sealing device, 31... Lower block, 32... Upper block, 40... Slightly adhesive tape, 41... Bracket, 43... Presser plate , 50...vacuum pump.

Claims (2)

a chamber in which an airtight space for accommodating a packaging bag is formed by closing the upper side of the chamber base in an openable and closable manner with a chamber cover;
a sealing device that is provided in the chamber and seals the opening periphery of the packaging bag to seal the packaging bag;
and a vacuum pump that evacuates the sealed space in the chamber to create a negative pressure,
The sealing device is provided on one horizontal side of the chamber, and has a first direction connecting the one side and the other side and a second direction perpendicular to the horizontal direction as a longitudinal direction. The vacuum packaging machine is provided with upper and lower blocks that extend as shown in FIG. hand,
A bracket is attached to and detached from a side portion of the lower block in the first direction, the upper surface of which is affixed with a slightly adhesive tape having a slightly adhesive surface that removably adheres to the opening periphery of the packaging bag. A vacuum packaging machine characterized in that the side edge of the slightly adhesive tape on the lower block side is sandwiched between the lower block and the bracket. The vacuum packaging machine according to claim 1 ,
The vacuum packaging machine is characterized in that the bracket is provided with a pressing plate on the opposite side of the lower block in the first direction for holding the side edge of the slightly adhesive tape opposite to the lower block. .

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