JP7237579B2 - vacuum packing machine - Google Patents

Description

In the present invention, the inside of the chamber is evacuated by a vacuum pump to create a negative pressure, and the opening peripheral edge of the packaging bag accommodated in the chamber is sealed by a sealing device, thereby evacuating the inside of the packaging bag. It relates to a vacuum packaging machine that seals

Patent Document 1 below discloses a vacuum packaging machine that vacuum-packages a packaging bag containing an object to be packaged such as foodstuffs and cooked foods. This vacuum packaging machine includes a chamber in which a closed space for accommodating a packaging bag is formed by covering the upper side of a chamber base provided on the upper part of a casing with a chamber cover so as to be openable and closable, and a packaging bag provided in the chamber. A heat-sealing device that seals the periphery of the opening of the bag by heat-sealing, and a vacuum pump that evacuates the inside of the chamber to a negative pressure are provided in the lower part of the casing. The heat-sealing device of the vacuum packaging machine includes a lower block vertically movable provided on the chamber base, an upper block provided on the lower surface of the chamber cover, a heater provided on the upper surface of the lower block, and a lower block. and an elevating mechanism for elevating the side blocks.

When vacuum packaging a packaging bag with this vacuum packaging machine, the packaging bag is placed on the upper side of the chamber base, and the vacuum packaging program is executed after the upper opening of the chamber base is closed with the chamber cover. When the vacuum packaging program is executed, the inside of the chamber is evacuated by a vacuum pump to a predetermined degree of vacuum, and after the packaging bag in the chamber is evacuated, the opening periphery is sandwiched between the lower and upper blocks. is welded by heating with a heater, and the packaging bag is sealed in a degassed state.

JP 2016-150757 A

In the vacuum packaging program of the above vacuum packaging machine, the inside of the chamber is evacuated to a predetermined degree of vacuum by a vacuum pump to create a negative pressure, and then the periphery of the opening of the packaging bag is sealed by a heat sealing device. In this way, the inside of the packaging bag is sealed in a degassed state. Depending on the items to be packaged in the packaging bag, it may not be necessary to seal the inside of the packaging bag in a degassed state. However, in the vacuum packaging program of the vacuum packaging machine, the inside of the chamber is evacuated to a predetermined degree of vacuum by a vacuum pump to create a negative pressure, and then the peripheral edge of the opening of the packaging bag is sealed by a heat sealing device. Since it is stopped, the inside of the chamber and the inside of the packaging bag are wasted. In addition, although there is a heat-sealing device separate from the vacuum packaging machine for heat-sealing the opening peripheral portion of the packaging bag without degassing the packaging bag, it is difficult to have both the vacuum packaging machine and the heat-sealing device. There was a problem of high cost. SUMMARY OF THE INVENTION An object of the present invention is to make it possible to seal a packaging bag in a deaerated state and a non-deaerated state with a single device.

In order to solve the above problems, the present invention provides a chamber which is provided in a casing and in which a closed space for accommodating a packaging bag is formed by covering the upper side of a chamber base with a chamber cover so as to be openable and closable; A sealing device provided inside the casing to seal the opening peripheral portion of the packaging bag to seal the packaging bag; One horizontal end of the chamber cover is pivotally supported by one horizontal end of the casing so as to be rotatable about the horizontal axis, and the other horizontal end of the chamber cover can be moved up and down. The sealing device comprises a lower block provided movably up and down at the other end of the chamber base in the horizontal direction; and an upper block provided at the other end of the lower surface of the chamber cover. The lower block is lifted and pressed against the upper block to seal the opening peripheral edge of the packaging bag. A sealed space in the chamber formed by sucking the cover against the chamber base under negative pressure is reduced to a predetermined pressure or less, and after the packaging bag housed in the chamber is degassed , the lower block is pressed against the upper block. and a control device having a first packaging program for sealing the opening peripheral edge of the packaging bag in a degassed state and sealing the packaging bag accommodated in the chamber in a degassed state, wherein The control device degasses the packaging bag accommodated in the chamber without reducing the sealed space in the chamber formed by vacuuming the chamber cover to the chamber base with a vacuum pump to a predetermined pressure or less. To provide a vacuum packaging machine characterized by having a second packaging program for sealing without sealing.

In the vacuum packaging machine configured as described above, the control device reduces the sealed space in the chamber formed by sucking the chamber cover to the chamber base with the vacuum pump to a predetermined pressure or less, and a first packaging program for degassing the packaging bag accommodated inside and then sealing the opening peripheral edge of the packaging bag while the lower block is pressed against the upper block to seal the packaging bag in the degassed state; The sealed space in the chamber formed by sucking the chamber cover to the chamber base with a vacuum pump is not reduced to a predetermined pressure or less, and the packaging bag accommodated in the chamber is sealed without degassing. Therefore, when sealing the packaging bag that needs to be degassed, the first packaging program is executed, and when sealing the packaging bag that does not need to be degassed, the second packaging program is executed. , it became possible to properly seal the packaging bag depending on the presence or absence of degassing. As a result, there is no need to prepare a sealing device separate from the vacuum packaging machine, which is used to seal the packaging bag without degassing, and the packaging bag can be degassed or not degassed only by the vacuum packaging machine. It can now be sealed.

In the vacuum packaging machine configured as described above, the casing is provided with a gas spring for urging the chamber cover to be opened, and the control device activates the gas spring when executing the second packaging program. It is preferable to control the operation of the vacuum pump for a time longer than the urging force to exert the suction force for sucking the chamber cover to the chamber base with the negative pressure.

1 is a perspective view of a vacuum packaging machine of a first embodiment; FIG. 1 is a schematic diagram of a vacuum packaging machine; FIG. It is a block diagram of a control device. FIG. 4 is a schematic diagram showing the force required to open the chamber cover and the force required to close the chamber cover; Fig. 3 is a flow chart of a first packaging program; Fig. 4 is a flow chart of a second packaging program; It is a perspective view of a vacuum packaging machine of a second embodiment. It is a flow chart of the second packaging program of the second embodiment.

Hereinafter, each embodiment of the vacuum packaging machine of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
As shown in FIGS. 1 and 2, the vacuum packaging machine 10 of the first embodiment includes a chamber 20 provided at the top of a casing 11 and a heat sealing chamber 20 for sealing the opening peripheral edge of the packaging bag in the chamber 20. A stopping device (sealing device) 30 and a vacuum pump 40 for degassing the inside of the chamber 20 to a negative pressure are provided in the lower portion of the casing 11 which is the lower side of the chamber 20 .

As shown in FIGS. 1 and 2, the casing 11 has a substantially rectangular parallelepiped shape, and a chamber 20 is provided in the upper portion of the casing 11 . The chamber 20 has a chamber base 21 and a chamber cover 22 provided on the casing 11 . The chamber base 21 has a shallow box shape with an open top and a substantially rectangular parallelepiped shape. The chamber cover 22 is made of a pressure-resistant acrylic plate that opens and closes the upper opening of the chamber base 21 . In the chamber 20, a closed space for accommodating a packaging bag is formed between the chamber base 21 and the chamber cover 22 by covering the upper side of the chamber base 21 with the chamber cover 22 so as to be openable and closable. The volume of the closed space of the chamber 20 of this embodiment is 13L.

The rear end of the chamber cover 22 (one end in the horizontal direction) is pivotally supported by the rear end of the casing 11 so as to be rotatable about the horizontal axis. end) is rotatable up and down. When the chamber cover 22 is rotated upward and separated from the chamber base 21, the chamber 20 is opened, and when the chamber cover 22 is rotated downward and the chamber base 21 is closed, The chamber 20 is sealed to form a closed space. A rubber packing 23 is provided as a sealing member around the lower surface of the chamber cover 22 , and the packing 23 airtightly seals between the chamber base 21 and the chamber cover 22 .

As shown in FIG. 2, a gas spring 12 is provided at the rear end of the casing 11, and the gas spring 12 biases the chamber cover 22 upward. The gas spring 12 is arranged at a position 30 mm forward from the rear end of the casing 11 on which the chamber cover 22 is pivotally supported, and biases the chamber cover 22 upward with a biasing force of 500N. A stopper 13 is provided at the front end (the other end in the horizontal direction) of the right side surface of the casing 11 so as to be rotatable about the horizontal axis. It has a function of holding the cover 22 in a position that closes the upper opening of the chamber base 21 .

As shown in FIG. 2 , a proximity switch 14 such as a reed switch is provided at the rear of the casing 11 , and a magnet 15 detected by the proximity switch 14 is provided at the rear of the chamber cover 22 . When the chamber cover 22 is closed so as to block the upper opening of the chamber base 21 , the proximity switch 14 outputs an ON signal as the magnet 15 approaches, and the chamber cover 22 opens the upper opening of the chamber base 21 . is rotated upward, the proximity switch 14 outputs an OFF signal as the magnet 15 is separated.

As shown in FIGS. 1 and 2, a heat sealing device (sealing device) 30 is provided at the front end (the other end in the horizontal direction) of the chamber 20 . The heat-sealing device 30 seals the opening peripheral edge of the packaging bag housed in the chamber 20 by thermal welding to seal the packaging bag. The heat-sealing device 30 comprises lower and upper blocks 31 and 32 for sandwiching the periphery of the opening of the packaging bag. The lower block 31 is made of a square pipe member made of aluminum, and is provided at the front end of the chamber base 21 so as to be detachable and vertically movable. 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 silicon block body, and is provided on the front portion of the lower surface of the chamber cover 22 at a position facing the upper side of the lower block 31 .

As shown in FIG. 2, the front end of the chamber base 21 is provided with a pair of left and right elevating mechanisms 34 for vertically elevating the lower block 31 . Each elevating mechanism 34 includes a support shaft 35 passing through the bottom wall of the front portion of the chamber base 21 and an elevating cylinder 36 for vertically moving the support shaft 35 . A flange portion 37 is provided at an axially intermediate portion of the support shaft 35, and the flange portion 37 airtightly partitions the interior of the lifting cylinder 36 into an upper space 36a and a lower space 36b. A spring member 38 is interposed around the outer periphery of the support shaft 35 in the upper space 36 a of the lift cylinder 36 , and the spring member 38 urges the support shaft 35 downward via the collar portion 37 . The lifting mechanism 34 is arranged at a position 460 mm forward from the rear end of the casing 11 on which the chamber cover 22 is pivotally supported. Further, the diameter of the lifting cylinder 36 is 75 mm, and the force with which the spring member 38 urges the collar portion 37 downward is 50N.

As shown in FIG. 2, a vacuum pump 40 is provided in the lower part of the casing 11. The vacuum pump 40 mainly sucks the inside of the chamber 20 and exhausts the air in the closed space inside the chamber 20. . The pumping speed of the vacuum pump 40 of this embodiment is 166 L/min. A suction pipe (suction path) 41 that connects the vacuum pump 40 and the chamber 20 is provided in the casing 11 , and a vacuum valve 42 is interposed in the suction pipe 41 . Air in the chamber 20 can be sucked into the vacuum pump 40 by opening the vacuum valve 42 . An outside air introduction pipe 43 for introducing outside air is connected to the suction pipe 41 between the chamber 20 and the vacuum valve 42. The outside air introduction pipe 43 has a first pipe portion 43a and a second pipe branched from the first pipe portion 43a. 2 tube portion 43b. First and second outside air introduction valves 44 and 45 for opening and closing the first and second pipe portions 43a and 43b are interposed. The first outside air introduction valve 44 has a larger diameter than the second outside air introduction valve 45. When the first outside air introduction valve 44 is opened, the outside air is quickly introduced into the chamber 20, and the second outside air introduction valve 45 is closed. When opened, ambient air is slowly introduced into chamber 20 .

A pressure detection tube 46 is connected to the suction tube 41 via the first tube portion 43 a of the outside air introduction tube 43 , and the pressure detection tube 46 is provided with a vacuum gauge 47 for detecting the pressure in the chamber 20 . When the inside of the chamber 20 is not degassed by the vacuum pump 40, the pressure inside the chamber 20 detected by the vacuum gauge 47 is 100 kPa (abs), which is the same as the atmospheric pressure, and the degree of vacuum at this time is 0%. When the pressure inside the chamber 20 is evacuated by the vacuum pump 40 to a negative pressure and the pressure inside the chamber detected by the vacuum gauge 47 is 0 kPa (abs), the degree of vacuum is 100%. Although the pressure inside the chamber 20 is directly detected by the vacuum gauge 47 , the pressure detected by the vacuum gauge 47 will be replaced with the degree of vacuum P inside the chamber 20 in the following description.

A cylinder pipe 48 branches from between the vacuum pump 40 and the vacuum valve 42 to the suction pipe 41 , and the cylinder pipe 48 is connected to the upper space 36 b of the lifting cylinder 36 . A three-way valve 49 is interposed in the cylinder pipe 48. Two ports of the three-way valve 49 are connected to the vacuum pump 40 side and the lifting cylinder 36 side of the cylinder pipe 48, and the remaining one port of the three-way valve 49 is connected to outside air. open to the side.

The vacuum packaging machine 10 includes a controller 50 which, as shown in FIG. 3, comprises the proximity switch 14, heater 33, vacuum pump 40, vacuum valve 42, first and second It is connected to outside air introduction valves 44 and 45 , vacuum gauge 47 , three-way valve 49 , and operation panel 51 provided on the front surface of casing 11 . The control device 50 has a microcomputer (not shown), and the microcomputer has a CPU, a RAM, a ROM and a timer (all not shown) connected via a bus. The control device 50 has a ROM with a first packaging program for sealing the packaging bag in a degassed state and a second packaging program for sealing the packaging bag without degassing.

In the first packaging program, the inside of the chamber 20 is reduced to a predetermined pressure by the vacuum pump 40, and after the packaging bag accommodated in the chamber 20 is degassed, the opening peripheral portion of the packaging bag is sealed by the heat sealing device 30. It is a program for stopping and sealing the packaging bag in a degassed state. In the first packaging program, in order to deaerate the inside of the packaging bag, the vacuum pump 40 is operated for 5 seconds or more, and the pressure inside the chamber 20 is at least about 66000 Pa or less (vacuum degree of about 35% or more). Negative pressure is created. The second packaging program is a program for sealing the opening peripheral edge of the packaging bag by the heat sealing device 30 without reducing the pressure inside the chamber 20 to a predetermined pressure or less, thereby sealing the packaging bag without degassing. is.

In order to seal the periphery of the opening of the packaging bag, the lower block 31 of the heat sealing device 30 is pressed against the upper block 32 to seal the periphery of the opening of the packaging bag between the lower and upper blocks 31 and 32. It must be clamped. The upper block 32 is provided on the lower surface of the chamber cover 22, and if the closed state of the chamber cover 22 is not maintained when the lower block 31 is lifted, the opening peripheral edge of the packaging bag is positioned downward and downward. It cannot be sandwiched between the upper blocks 31 and 32. On the other hand, the chamber cover 22 is biased to be opened by the gas spring 12, and when the lower block 31 is lifted, the chamber cover 22 has a pressure when the lower block 31 presses against the upper block 32. force will be applied. Therefore, in order to seal the periphery of the opening of the packaging bag in the chamber 20, the pressure inside the chamber 20 is reduced to a negative pressure so that the chamber cover 22 is sucked by the chamber base 21 under a negative pressure. It is necessary to keep the cover 22 from opening from the chamber base 21 .

As shown in FIG. 4, when the chamber cover 22 is closed so as to close the upper opening of the chamber base 21, the chamber cover 22 is biased upwardly by the gas spring 12, so that the lower block is closed. 32 is pressed against the upper block 31 , the force of the lower block 31 pressing against the upper block 32 is applied to the chamber cover 22 by the elevating mechanism 34 . Therefore, when executing the second packaging program, the chamber 20 is sucked by the vacuum pump 40 so as to apply a suction force slightly larger than the upward force applied to the chamber cover 22 by the gas spring 12 and the lifting mechanism 34. There is a need.

As shown in FIG. 4, the gas spring 12 pushes the chamber cover 22 upward with a force of 500N at 30 mm forward from the rear end of the casing 11 on which the chamber cover 22 is pivoted (shown at d1 in FIG. 4). energized. In order to attract the chamber cover 22 to the chamber base 21 against the biasing force of the gas spring 12, the horizontal central portion 270 mm forward from the rear end of the chamber cover 22 (shown at d2 in FIG. 4) It is necessary to apply an attractive force with a force X1 to , and the force X1 can be obtained from the following equation.
500N×0.03m=X1×0.27m
X1=56N

Further, when the lower block 31 presses the upper block 32, the force Y1 when one lifting mechanism 34 lifts the lower block 31 upward is equal to the pressure of 100000 Pa applied when the inside of the lifting cylinder 36 is evacuated. It is obtained by multiplying the inner area and then subtracting the force of 50 N that the spring member 38 interposed in the lifting cylinder 36 biases downward.
Y1 = (100000Pa x 0.0375m x 0.0375m x π) - 50N
= 391.6N
The elevating mechanisms 34 are arranged in a left and right pair inside the casing 11, and the force Y2 with which the lower block 31 is pushed upward by the pair of elevating mechanisms 34 is the force Y1 when one elevating mechanism 34 lifts the lower block 31 upward. is obtained by doubling the
Y2=Y1×2=391.6N×2=783.2N

As shown in FIG. 4, when the opening peripheral portion of the packaging bag is sealed by the heat sealing device 30, the lower block 31 is positioned behind the casing 11 on which the chamber cover 22 is pivotally supported by the pair of elevating mechanisms 34. The chamber cover 22 is pushed upward by a force of 783.2 N at a position 460 mm forward from the end (shown at d3 in FIG. 4). In order to attract the chamber cover 22 to the chamber base 21 against the force pushing up by the lower block 31, a horizontal It is necessary to apply an attractive force to the central portion of , with a force X2 represented by the following equation, and the force X2 can be obtained from the following equation.
783.2N×0.46m=X2×0.27
X2=1334N

The downward force X1 required for the central portion of the chamber cover 22 to attract the chamber cover 22 to the chamber base 21 against the urging force of the gas spring 12 is 56 N, and the lower block 31 is lifted by the pair of lifting mechanisms 34. The downward force required on the central portion of the chamber cover 22 to attract the chamber cover 22 against the force X2 when lifted is 1334 N, and when added together, the chamber cover 22 The force X1+X2 required for the central portion of the chamber cover 22 for the suction is 1390N.

The area S of the lower surface of the chamber cover 22 is expressed by the following equation.
S = 0.4 m x 0.46 m = 0.18 ^mm2 ,
The differential pressure P1 required to attract the chamber cover 22 to the chamber base 21 is
P1 = 1390 N/0.18 mm ² = 7722 Pa,
In order to pinch the opening edge of the packaging bag between the lower and upper blocks 31 and 32, the pressure inside the chamber 20 must be P, which is the atmospheric pressure of 100,000 Pa minus P1.
P=100000Pa-7722Pa=92278Pa.

The exhaust speed for exhausting the inside of the chamber 20 by the vacuum pump 40 is 166 L/min, and the time t for sucking the air in the chamber 20 to reduce the pressure of the 13 L sealed space in the chamber 20 from the atmospheric pressure of 100000 Pa to 92278 Pa is
t = 13L/166L/min x 2.3log (100000/92278)
= 6.29 × 10 ^-3 min
becomes. In this way, the vacuum pump 40 is operated for a chamber cover suction time (for example, 0.1 second) which is the shortest operation time (for example, 0.1 second) of the vacuum pump 40 at 6.29×10 ⁻³ min or more, and the inside of the chamber 20 is degassed. By doing so, the chamber cover 22 can be sucked by the chamber base 21 under negative pressure so that the chamber cover 22 is not opened even if the lower block 31 is pressed against the upper block 32 .

Next, control when the first and second packaging programs are executed by the control device 50 will be described. In the first packaging program, a plurality of different programs such as the degree of vacuum in the chamber 20 and how to open the first and second outside air introduction valves 44 and 45 are set according to the temperature of the food to be put in the packaging bag. . As an example of the first packaging program, a packaging program for when the food is at normal temperature (low temperature) will be specifically described. Before executing the first packaging program, the vacuum valve 42 and the second outside air introduction valve 45 are closed, and the three-way valve 49 is open on the lift cylinder 36 side and the outside air side (the vacuum pump 40 side is closed). closed). An object to be packaged such as foodstuffs and cooked food is placed in the packaging bag, and the packaging bag is accommodated in the chamber 20 so that the opening peripheral edge of the packaging bag is placed on the upper side of the lower block 31. - 特許庁The operation panel 51 is pushed to select the first wrapping program for when the food is at room temperature, and execution of the selected first wrapping program is put on standby.

As shown in FIG. 5, in step 101, the control device 50 determines whether or not an ON signal has been input from the proximity switch 14 to determine whether or not the chamber cover 22 has been closed. When the chamber cover 22 is not closed, the magnet 15 is not approaching the proximity switch 14, so the proximity switch 14 outputs an OFF signal to the control device 50, and the control device 50 determines "NO" at step 101. repeatedly and wait. When the chamber cover 22 is closed and the magnet 15 approaches the proximity switch 14, the proximity switch 14 outputs an ON signal to the control device 50, and the control device 50 determines "YES" in step 101 and proceeds to step 102. . In step 102, the control device 50 opens the vacuum valve 42, closes the first outside air introduction valve 44, and operates the vacuum pump 40. The vacuum pump 40 evacuates the interior of the chamber 20 to create a negative pressure. go.

In step 103, the controller 50 repeatedly determines whether or not the degree of vacuum P in the chamber 20 detected by the vacuum gauge 47 has reached or exceeded a preset degree of vacuum Px (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 47 becomes equal to or higher than a preset degree of vacuum Px (below a predetermined pressure), the control device 50 in step 103 YES is determined and the process proceeds to step 104 . In step 104 , the control device 50 closes the vacuum valve 42 to stop degassing the chamber 20 and proceeds to step 105 .

When the inside of the chamber 20 becomes more than the degree of vacuum Px set as the predetermined pressure (below the predetermined pressure) and the inside of the packaging bag is also degassed, the controller 50 moves the three-way valve 49 to the lift cylinder 36 side in step 105. The vacuum pump 40 side is opened (the outside air side is closed). The upper space 36b of the lifting cylinder 36 is depressurized by the vacuum pump 40, the support shaft 35 rises against the urging force of the spring member 38, and the lower block 31 rises by the support shaft 35 rising. The lower block 31 is pressed against the upper block 32 by the rising support shaft 35 , and the peripheral edge of the opening of the packaging bag is clamped between the lower block 31 and the upper block 32 . In step 106, the control device 50 energizes the heater 33 to generate heat, and the peripheral edge of the opening of the packaging bag is closed by thermal welding, and the packaging bag is sealed in a degassed state (vacuum state).

In step 107, the control device 50 stops the operation of the vacuum pump 40 and opens the first outside air introduction valve 44, and in step 108, opens the three-way valve 49 on the lifting cylinder 36 side and the outside air side (vacuum pump 40 side is closed). The inside of the chamber 20 is returned to the atmospheric pressure by the outside air introduced from the first outside air introduction valve 44, and the chamber cover 22 is opened by the biasing force of the gas spring 12 without being sucked by the negative pressure. In addition, by opening the lift cylinder 36 side and the outside air side of the three-way valve 49, the outside air is introduced into the upper space 36b of the lift cylinder 36, and the negative pressure state is released. The force lowers the lower block 31 and separates it from the upper block 32, so that the peripheral edge of the opening of the packaging bag is released from the sandwiched state between the lower and upper blocks 31 and 32.例文帳に追加In this way, the packaging bag is sealed in an evacuated state (vacuum state).

Next, the second packaging program will be explained. Before executing the second packaging program, the vacuum valve 42 and the second outside air introduction valve 45 are closed, as in the case of executing the first packaging program, and the three-way valve 49 is closed on the lifting cylinder 36 side and the outside air side. are open (the vacuum pump 40 side is closed). An object to be packaged such as foodstuffs and cooked food is placed in the packaging bag, and the packaging bag is accommodated in the chamber 20 so that the opening peripheral edge of the packaging bag is placed on the upper side of the lower block 31. - 特許庁The operation panel 51 is pushed to select the second wrapping program, and execution of the selected second wrapping program is put on standby.

As shown in FIG. 6, in step 201, the controller 50 determines whether an ON signal has been input from the proximity switch 14, and determines whether the chamber cover 22 has been closed. When the chamber cover 22 is not closed, the magnet 15 is not approaching the proximity switch 14, so the proximity switch 14 outputs an OFF signal to the control device 50, and the control device 50 determines "NO" at step 201. repeatedly and wait. When the chamber cover 22 is closed and the magnet 15 approaches the proximity switch 14, the proximity switch 14 outputs an ON signal to the control device 50, and the control device 50 determines "YES" in step 201 and proceeds to step 202. . In step 202, the controller 50 opens the vacuum valve 42, closes the first outside air introduction valve 44, and actuates the vacuum pump 40 for 0.1 seconds, which is the chamber cover suction time described above. The vacuum pump 40 evacuates the inside of the chamber 20 to a negative pressure to such an extent that is sucked into the chamber base 21 . At this time, the inside of the chamber 20 is not under a negative pressure to the extent that the inside of the packaging bag is degassed. In step 203 , the controller 50 closes the vacuum valve 42 to maintain the negative pressure in the chamber 20 and proceeds to step 204 .

In step 204, the control device 50 opens the three-way valve 49 to the lift cylinder 36 side and the vacuum pump 40 side (closes the outside air side). The upper space 36b of the lifting cylinder 36 is depressurized by the vacuum pump 40, the support shaft 35 rises against the urging force of the spring member 38, and the lower block 31 rises by the support shaft 35 rising. The lower block 31 is pressed against the upper block 32 by the rising support shaft 35 , and the peripheral edge of the opening of the packaging bag is clamped between the lower block 31 and the upper block 32 . In step 205, the control device 50 energizes the heater 33 to generate heat, and the peripheral edge of the opening of the packaging bag is closed by thermal welding, and the packaging bag is sealed without being degassed.

In step 206, the control device 50 stops the operation of the vacuum pump 40 and opens the first outside air introduction valve 44, and in step 207, opens the three-way valve 49 on the lifting cylinder 36 side and the outside air side (vacuum pump 40 side is closed). The inside of the chamber 20 is released from the negative pressure state by the outside air introduced from the first outside air introduction valve 44 , and the chamber cover 22 is opened by the biasing force of the gas spring 12 without being sucked in by the negative pressure. In addition, by opening the lift cylinder 36 side and the outside air side of the three-way valve 49, the outside air is introduced into the upper space 36b of the lift cylinder 36, and the negative pressure state is released. The force lowers the lower block 31 and separates it from the upper block 32, so that the peripheral edge of the opening of the packaging bag is released from the sandwiched state between the lower and upper blocks 31 and 32.例文帳に追加In this way, the packaging bag is sealed without being degassed.

In the vacuum packaging machine 10 configured as described above, the control device 50 reduces the pressure inside the chamber 20 to a predetermined pressure or less by the vacuum pump 40, deaerates the packaging bag accommodated in the chamber 20, and then packages the bag. A first packaging program for sealing the opening peripheral edge of the bag by a heat sealing device 30 to seal the packaging bag in a degassed state, and a chamber 20 without reducing the pressure in the chamber 20 to a predetermined pressure or less It had a second packaging program to seal the packaging bag contained therein without degassing. When executing the second packaging program, the controller 50 causes the vacuum pump 40 to evacuate the chamber 20 so that even if the lower block 31 is lifted and pressed against the upper block 32, the chamber cover 22 will not be opened. It is controlled to deaerate. In this manner, the first packaging program is executed when a packaging bag that needs to be degassed is sealed, and the second packaging program is executed when a packaging bag that does not need to be degassed is sealed. It is now possible to properly seal the bag with or without degassing. In particular, when the second packaging program is executed, the inside of the chamber 20 is not wastefully reduced to a negative pressure below the predetermined pressure, so not only can the time for sealing the packaging bag be shortened, but also power consumption can be reduced. did it. Furthermore, in order to seal the packaging bag without degassing, there is no need to prepare a sealing device for sealing the opening peripheral portion of the packaging bag separately from the vacuum packaging machine 10, and the vacuum packaging machine 10 alone is sufficient. It became possible to seal the packaging bag in a deaerated state and a non-deaerated state.

(Second embodiment)
In the vacuum packaging machine 10 of the second embodiment, the stopper 13 provided at the front end portion (the other end portion in the horizontal direction) of the right side surface of the casing 11 is also provided at the front end portion of the left side surface of the casing. Specifically, the rear end (one end in the horizontal direction) of the chamber cover 22 is pivotally supported by the rear end (one end in the horizontal direction) of the casing 11 so as to be rotatable around the horizontal axis. The front end (the other end in the horizontal direction) of the casing 11 is engaged with the front end of the chamber cover 22 on both left and right sides (on both sides in the orthogonal direction that is perpendicular to the direction connecting the one and the other in the horizontal direction). A stopper 13 is provided to lock the chamber cover 22 so that it does not open. Since the front end of the chamber cover 22 is locked by stoppers 13 on both left and right sides, the chamber cover 22 is kept closed even when the lower block 31 is pressed against the upper block 32.例文帳に追加be able to. As described above, the vacuum packaging machine 10 of the second embodiment does not draw the negative pressure from the chamber 20 by the vacuum pump 40 as in the vacuum packaging machine 10 of the first embodiment, but the chamber cover 22 is closed. can be maintained. Other than this, the configuration is the same as that of the vacuum packaging machine 10 of the first embodiment.

Next, the second packaging program of the vacuum packaging machine 10 of this second embodiment will be described. Even before executing the second packaging program of the vacuum packaging machine 10 of the second embodiment, the vacuum valve 42 and the second outside air introduction valve 45 are in the closed state, and the three-way valve 49 on the lifting cylinder 36 side and the outside air side are closed. is open (the vacuum pump 40 side is closed). An object to be packaged such as foodstuffs and cooked food is placed in the packaging bag, and the packaging bag is accommodated in the chamber 20 so that the opening peripheral edge of the packaging bag is placed on the upper side of the lower block 31. - 特許庁After the chamber cover 22 is closed, the left and right stoppers 13 are engaged with the upper surface of the chamber cover 22 to keep the chamber cover 22 closed. The operation panel 51 is pushed to select the second wrapping program, and execution of the selected second wrapping program is put on standby.

As shown in FIG. 8, in step 301, the control device 50 determines whether or not an ON signal has been input from the proximity switch 14. The chamber cover 22 is closed, the magnet 15 approaches the proximity switch 14, and the proximity switch 14 outputs an ON signal to the control device 50. Therefore, the control device 50 determines "YES" in step 301. Proceed to step 302 . In step 302 , the controller 50 opens the three-way valve 49 to the lifting cylinder 36 side and the vacuum pump 40 side (closes the outside air side), and operates the vacuum pump 40 . The upper space 36b of the lifting cylinder 36 is depressurized by the vacuum pump 40, the support shaft 35 rises against the urging force of the spring member 38, and the lower block 31 rises by the support shaft 35 rising. The lower block 31 is pressed against the upper block 32 by the rising support shaft 35 , and the peripheral edge of the opening of the packaging bag is clamped between the lower block 31 and the upper block 32 . In step 303, the control device 50 energizes the heater 33 to generate heat, and the peripheral edge of the opening of the packaging bag is closed by thermal welding, and the packaging bag is sealed without being degassed. Since the vacuum valve 42 is closed, the inside of the chamber 20 is maintained in a state where it is not degassed.

In step 304, the control device 50 stops the operation of the vacuum pump 40, and in step 305, opens the lift cylinder 36 side and the outside air side of the three-way valve 49 (closes the vacuum pump 40 side). By opening the lift cylinder 36 side and the outside air side of the three-way valve 49, the outside air is introduced into the upper space 36b of the lift cylinder 36, and the negative pressure state is released. The lower block 31 is lowered, separated from the upper block 32, and the opening peripheral edge of the packaging bag is released from the pinched state between the lower and upper blocks 31 and 32.例文帳に追加In this way, the packaging bag is sealed without being degassed.

Also in the vacuum packaging machine 10 of the second embodiment, the first packaging program is executed when a packaging bag that needs to be deaerated is sealed, and the second packaging program is executed when a packaging bag that does not need to be deaerated is sealed. By executing the program, it became possible to properly seal the packaging bag depending on the presence or absence of degassing. Thus, in order to seal the packaging bag without degassing, it is not necessary to prepare a sealing device for sealing the opening peripheral edge of the packaging bag separately from the vacuum packaging machine 10, and only the vacuum packaging machine 10 is required. It became possible to seal the packaging bag in a deaerated state and a non-deaerated state. Furthermore, unlike the vacuum packaging machine 10 of the first embodiment, the inside of the chamber 20 is not vacuumed by the vacuum pump 40, and the closed state of the chamber cover 22 can be maintained. It was possible to reduce the time and power required for pressure suction.

In the vacuum packaging machine 10 of the above-described embodiment, the chamber cover 22 serves as one end in the horizontal direction, and the rear end serves as one end in the horizontal direction of the casing 11, and the rear end is rotatable about the horizontal axis. The chamber cover 22 is axially supported, and the other end in the horizontal direction of the chamber cover 22 is rotated up and down to open and close with the chamber base 21, but this is not the only option. The chamber cover 22 can rotate about the horizontal axis to the front, left or right end as one horizontal end of the casing 11. , and the rear end, the right end or the left end of the chamber cover 22 as the other end in the horizontal direction is rotated up and down to open and close with the chamber base 21. may The sealing device 30 has a lower block 31 which is vertically movable at the front end as the other end of the chamber base 21 in the horizontal direction, and a lower block 31 which is the other end of the lower surface of the chamber cover 22 at the front end. The upper block 32 is provided, and the lower block 31 is lifted and pressed against the upper block 32 to seal the opening peripheral edge of the packaging bag, but is not limited to this. The apparatus 30 has a lower block 31 provided movably up and down at the rear end, the right end or the left end as the other horizontal end of the chamber base 21, and the other end of the lower surface of the chamber cover 22. An upper block 32 provided at the rear end, the right end, or the left end may be provided.

DESCRIPTION OF SYMBOLS 10... Vacuum packaging machine, 11... Casing, 20... Chamber, 21... Chamber base, 22... Chamber cover, 30... Sealing device (heat sealing device), 31... Lower block, 32... Upper block, 33... Heater, 34... Lifting mechanism, 40... Vacuum pump, 50... Control device.

Claims (2)

a chamber that is provided in the casing and that forms an enclosed space for accommodating the packaging bag therein by covering the upper side of the chamber base with the chamber cover so as to be openable and closable;
a sealing device that is provided in the chamber and seals the opening peripheral edge of the packaging bag to seal the packaging bag;
a vacuum pump provided in the casing for degassing the sealed space in the chamber to a negative pressure;
One horizontal end of the chamber cover is pivotally supported by one horizontal end of the casing so as to be rotatable about a horizontal axis, and the other horizontal end of the chamber cover moves up and down. It is designed to open and close between the chamber base and the chamber base by rotating the
The sealing device includes a lower block provided movably up and down at the other end of the chamber base in the horizontal direction, and an upper block provided at the other end of the lower surface of the chamber cover. and sealing the peripheral edge of the opening of the packaging bag while the lower block is raised and pressed against the upper block,
A closed space in the chamber formed by sucking the chamber cover to the chamber base by the vacuum pump is reduced to a predetermined pressure or less, and the packaging bag accommodated in the chamber is degassed. a first packaging program for sealing the opening periphery of the packaging bag while the lower block is pressed against the upper block to seal the packaging bag accommodated in the chamber in a degassed state; A vacuum packaging machine comprising a control device having
The control device accommodates the sealed space in the chamber formed by sucking the chamber cover to the chamber base by the vacuum pump to a predetermined pressure or less, without reducing the pressure to a predetermined pressure or less. A vacuum packaging machine comprising a second packaging program for sealing the packaging bag without deaeration. The vacuum packaging machine according to claim 1,
The casing is provided with a gas spring that biases the chamber cover to open,
When the second packaging program is executed, the control device operates the vacuum pump for a time longer than the biasing force of the gas spring and longer than the time required for the chamber cover to suck negative pressure to the chamber base. A vacuum packaging machine characterized by controlling to

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