JP6514907B2 - Vacuum packing machine - Google Patents

Description

  The present invention relates to a vacuum packaging machine for degassing the inside of a chamber with a vacuum pump and producing a negative pressure, and vacuum-packing the inside of the packaging bag in a degassed state. The present invention relates to a vacuum packaging machine capable of vacuum packaging.

Patent Document 1 listed below discloses a vacuum packaging machine for vacuum-packing a packaging bag in which articles to be packaged such as food and food are stored. The vacuum packaging machine, food, a chamber for accommodating a packaging bag that houses the packaged articles of food such as closed to clamp the opening portion of the packaging bag from the upper and lower at the front of the chamber and below the block body And a heater provided on the upper and lower block members for heat welding the periphery of the opening of the packaging bag, and an oil rotary vacuum pump for degassing the chamber to make it under negative pressure. When a liquid packaged material containing oil such as soup or stew is uniformly contained (dispensed) in a plurality of packaging bags, the temperature is higher than the normal temperature at which the oil does not coagulate. It is necessary to divide it into multiple packaging bags and store them as they are (warm). With a vacuum packaging machine mainly intended for vacuum-packing a package at a temperature lower than normal temperature in a packaging bag, when vacuum-wrapping a packaging bag containing a package at a temperature higher than normal temperature, the inside of the packaging bag Of the liquid boil and there is a problem that it is easy to blow out into the chamber. For this reason, the vacuum packaging machine of Patent Document 1 is capable of vacuum packaging a packaging bag containing a package at a temperature higher than normal temperature, and Patent Document 1 discloses that the vacuum packaging machine has a temperature higher than that of the vacuum packaging machine. A packaging program is described for vacuum packaging high temperature packages into packaging bags.

When vacuum-packing a package at a temperature higher than normal temperature with the vacuum packaging machine in a packaging bag, the temperature of the package is measured in advance, and a target pressure in the chamber based on the temperature of the package is set. Keep it. The packaging bag containing the material to be packaged is accommodated in the chamber, and the lid of the chamber is closed, and then the pressure reduction in the chamber is started by the oil rotary vacuum pump. When a pressure (first set pressure P1) higher than the boiling pressure of the package in the chamber is detected, the pressure is continuously reduced while the pressure reduction rate in the chamber is reduced, and the pressure at which the package boils (second When the set pressure P2) is detected, the lower block body is raised to pinch the periphery of the opening of the packaging bag between the upper and lower block bodies and close the periphery of the opening of the packaging bag. In the chamber depressurized to the second set pressure P2, the packaging bag is expanded by water vapor generated by evaporation of the liquid in the packaging bag, but the packing material in the packaging bag has the upper and lower opening peripheries of the packaging bag. Because it is closed by the block body, it does not spill out. Furthermore, when a pressure (third set pressure) lower than the second set pressure is detected in the chamber, the pressure reduction in the chamber is stopped, and the lower block body is moved downward to open the opening of the packaging bag. Then, the gas in the packaging bag is exhausted. When the gas in the packaging bag is discharged, the lower block body is raised to again sandwich and close the opening periphery of the packaging bag, and the heater is energized to seal the opening periphery of the packaging bag. Thereafter, the lower block body is moved downward to release the holding state of the packaging bag, and the inside of the chamber is returned to the atmospheric pressure to complete the vacuum packaging of the packaging bag.

JP, 2013-203402, A

  In the vacuum packaging machine as described above, when vacuum packaging a package at a temperature higher than normal temperature in the packaging bag, the water contained in the package in the packaging bag is boiled to become water vapor, and the opening of the packaging bag The water vapor discharged into the chamber together with the gas exhausted from the air is drawn into the oil rotary vacuum pump. If water is mixed in the oil of the oil rotary vacuum pump, the oil rotary vacuum pump can not degas the chamber to an appropriate pressure, or parts of the oil rotary vacuum pump may be rusted or degraded by water contained in the oil. become. In general vacuum packaging machines whose sole purpose is to vacuum-pack articles below normal temperature in packaging bags, the amount and frequency of water mixing in the oil of the oil rotary vacuum pump is low, so use of vacuum packaging machines Depending on the frequency, water can be removed from the oil, for example, once a week, once a week, once a day. However, as described above, in a vacuum packaging machine which enables vacuum packaging of a package at a temperature higher than normal temperature in a packaging bag, more water mixed in with oil, for example, every day using the vacuum packaging machine Sometimes, it was not possible to remove water from the oil sufficiently only by periodically draining the water on a weekly basis. In addition, it is possible to remove water from the oil by remembering the number of times the worker vacuum-packages the package at a temperature higher than normal temperature in the packaging bag, and regularly draining water according to the number. However, workers often perform other tasks in parallel, and it was not always possible to remember that they were draining operation. Furthermore, if the oil rotary vacuum pump is always operated without degassing the chamber when not working on vacuum packaging, although the water contained in the oil can always be removed, the vacuum packaging machine There was a problem that the running cost including the electricity cost of The present invention relates to a vacuum packaging machine capable of vacuum-packing a package material having a temperature higher than normal temperature in a packaging bag, and a warm-up operation of an oil rotary vacuum pump for removing water mixed in oil of an oil rotary vacuum pump. The purpose is to be able to do it properly.

In order to solve the above problems, according to the present invention, at least one of the upper and lower portions is supported so as to move up and down in the chamber which accommodates the packaging bag containing the package, and the opening peripheral edge of the packaging bag is vertically a block body pinching and close vertically from, a heater for heat welding the periphery of the opening of the packaging bag provided on at least one of the upper and lower block body, an oil rotary vacuum pump for negative pressure by evacuating the interior of the chamber When, from by discharging gas in the packaging bag accommodated in the chamber by negative pressure in the chamber by the operation of the oil-rotary vacuum pump, close the clamping the periphery of the opening of the packaging bag by the upper and lower block body A first mode of packaging program suitable when the package is at a normal temperature or less, and the operation of the oil rotary vacuum pump, in which the periphery of the opening of the packaging bag is sealed by heating and welding by the operation of the heater. Therefore, the pressure in the chamber is reduced to a negative pressure, and the upper and lower blocks are moved up and down around the opening of the packaging bag in the negative pressure chamber so that the closed state is opened and the gas in the packaging bag is discharged. after execution bladder exhaust control one or more times to close by clamping the periphery of the opening of the packaging bag by the upper and lower block body, sealed by heat welding the periphery of the opening of the packaging bag by the operation of the heater, to be packaged A vacuum packaging machine having a second mode packaging program suitable when the temperature is higher than normal temperature, the warm-up operation of operating the oil rotary vacuum pump after executing the second mode packaging program The present invention provides a vacuum packaging machine characterized by being automatically controlled.

In the vacuum packaging machine configured as described above, the packaging program of the second mode is a packaging program suitable for packaging a package having a temperature higher than normal temperature, and the packaging program of the second mode is When executed, the water vapor evaporated from the package tends to be mixed into the oil of the oil rotary vacuum pump, but after the second mode packaging program is executed, the oil rotary vacuum pump can be used without degassing in the chamber. Since it was controlled to automatically execute the warm-up operation to be operated, even after the operator forgets the operation of draining oil of the oil rotary vacuum pump after the packaging operation, after executing the packaging program of the second mode In the oil rotary vacuum pump, warm-up operation of the oil rotary vacuum pump is executed reliably, and the oil rotary vacuum pump's degassing ability decreases when water mixes with the oil, and the oil rotary vacuum pump's It is possible to prevent deterioration such as rusting by the water forming components are included in the oil.

  In one embodiment of the vacuum packaging machine configured as described above, the warm-up operation is interrupted when the execution of the packaging program of the second mode is requested again during the warm-up operation, and the packaging program of the second mode is performed. It is preferable to further include a counter unit for counting the number of times of execution, and to control to determine the warm-up operation time of the warm-up operation of the oil rotary vacuum pump based on the number of times counted by the counter unit; The oil rotary vacuum pump can be warmed up with a warm up operation time of a length corresponding to the number of times of execution of the packaging program. In addition, when the packaging program of the first mode is executed during the warming-up operation, the warming-up operation is performed with the remaining warming-up operation time remaining before interrupting the warming-up operation after executing the packaging program of the first mode It is preferable to control to execute, and even after the first mode packaging program is executed, the oil rotary vacuum pump of warm-up operation time of a length corresponding to the number of times of execution of the second mode packaging program. The warm-up operation can be performed, and the warm-up operation can be performed at an appropriate time.

In another embodiment of the vacuum packaging machine configured as described above, when the execution of the packaging program of the second mode is requested again during the warm-up operation, it remains when the warm-up operation is interrupted and interrupted. The warm-up operation of the oil rotary vacuum pump is performed by storing the remaining warm-up operation time and adding the predetermined addition time to be added after the second packaging program is executed to the remaining warm-up operation time In this case, the oil rotary vacuum pump can be warmed up with a warm up operation time of a length corresponding to the number of times of execution of the packaging program in the second mode. I was able to run the operation at an appropriate time. In this case, it is preferable that the addition time be determined based on the number of times of execution of the in-bag evacuation control of the packaging program of the second mode. When doing this, the oil rotary vacuum pump can be warmed up with a warm-up operation time of a length corresponding to the number of times of execution of the number of times of in-bag evacuation control that water tends to mix into oil of the oil rotary vacuum pump. The warm-up operation could be performed at an appropriate time.

  In still another embodiment of the vacuum packaging machine configured as described above, the oil rotary vacuum pump further includes a pump temperature sensor for detecting this temperature, and the oil rotary vacuum based on the temperature detected by the pump temperature sensor It is preferable to determine the warm-up operation time of the pump. The oil in the oil rotary vacuum pump is included in the oil by determining the appropriate warm-up operation time according to the temperature of the oil rotary vacuum pump because the higher the temperature, the easier it is to remove the mixed water. Water was able to be removed with proper warm-up time.

  In still another embodiment of the vacuum packaging machine configured as described above, further comprising a timer for measuring the operation time and stop time of the oil rotary vacuum pump, based on the operation time and stop time measured by the timer The temperature of the oil rotary vacuum pump may be estimated, and the warm-up operation time may be determined based on the estimated temperature. Also in this case, the water contained in the oil could be removed by the appropriate warm-up operation time by determining the appropriate warm-up operation time according to the temperature of the oil rotary vacuum pump.

  The vacuum packaging machine thus configured further includes an outside air temperature sensor for detecting the outside air temperature, and based on the operating time and stop time of the oil rotary vacuum pump measured by the timer and the outside air temperature sensor The temperature of the oil rotary vacuum pump may be estimated, and the warm-up operation time of the oil rotary vacuum pump may be determined based on the estimated temperature. When doing this, the warm-up operation time of water contained in oil is determined by determining the appropriate warm-up operation time according to the temperature of the oil rotary vacuum pump in consideration of the influence of the outside air temperature. I was able to get rid of it.

It is a perspective view showing the vacuum packing machine of the present invention by the state where a chamber cover was opened. It is the schematic which shows the various components of the vacuum packaging machine of this invention. It is a figure which shows an operation panel. It is a block diagram showing a control device. It is a flowchart of the packaging program of 1st mode. It is a flowchart of the packaging program of fixing the number of times of in-bag evacuation control in the second mode. It is a flowchart of a packaging program with variable number of times of in-bag evacuation control in a second mode. It is a flowchart when waiting for the execution request of a packaging program (1). It is a flowchart when waiting for the execution request of a packaging program (2). It is a flowchart when waiting for the execution request of a packaging program (3). When determining the warm-up operation time in the third warm-up operation, it is a graph (a) showing the correlation of the temperature of the vacuum pump inferred from the vacuum pump operation time, and inferred from the stop time of the vacuum pump It is a graph (b) which shows the correlation of the temperature of a vacuum pump. It is a graph corresponded to FIG. 11 when outside temperature differs.

  Hereinafter, an embodiment of a vacuum packaging machine of the present invention will be described with reference to the attached drawings. The vacuum packaging machine according to the present invention vacuum-packs packaged materials such as foodstuffs and food products in a packaging bag, and may vacuum-pack a packaging material having a temperature (warm or hot) higher than normal temperature in the packaging bag. It is possible.

  As shown in FIGS. 1 and 2, the vacuum packaging machine 10 includes a chamber 12 containing the packaging bag in the upper part of the housing 11 and a heat seal for sealing the periphery of the opening of the packaging bag at the front in the chamber 12. A stopper 20 and a vacuum pump 30 for degassing the inside of the chamber 12 at the lower part of the housing 11 to make it underpressure.

  As shown in FIG. 1, the chamber 12 is composed of a shallow dish-shaped chamber base 13 having an open upper surface, and a chamber cover 14 formed of a pressure-resistant acrylic plate closing the upper surface opening of the chamber base 13 openably and closably. Pressure-tight sealed container. The rear end portion of the chamber cover 14 is rotatably supported at the rear end portion of the housing 11 about a horizontal axis, and the front end side of the chamber cover 14 is vertically movable above the chamber base 13. Also, a spring member (not shown) is provided at the rear of the housing 11, and the chamber cover 14 is biased by the spring member so that the front end moves upward (so that the chamber cover 14 is opened). . A rubber packing 15 is provided as a sealing member around the lower surface of the chamber cover 14, and the packing 15 airtightly seals between the chamber base 13 and the chamber cover 14. A hook 16 is provided at the front of the housing 11 to keep the chamber cover 14 closed, and the hook 16 temporarily holds the chamber cover 14 so as not to open. The hooks 16 are used so that the chamber cover 14 does not open the chamber base 13 when the vacuum packaging machine 10 is not used.

  A proximity switch 17 such as a reed switch is provided on the rear upper side of the housing 11 on the rear side of the chamber base 13, and a magnet 18 serving as a detected member of the proximity switch 17 is provided on the rear of the chamber cover 14 There is. When the chamber cover 14 closes and closes the top opening of the chamber base 13, the proximity switch 17 outputs an on signal when the magnet 18 approaches and when the chamber cover 14 opens, the proximity switch 17 separates the magnet 18 The off signal is output by doing.

As shown in FIGS. 1 and 2, a heat sealing device 20 is provided at the front of the chamber 12. The heat sealing device 20 heats and seals the periphery of the tip opening of the heat sealable packaging bag housed in the chamber 12. In addition, the packaging bag uses a thermoplastic resin film of a two-layer structure in which a material having a low melting point is used inside. The heat sealing device 20 includes elongated lower and upper block bodies 21 and 22 for clamping and holding ( pinning ) the tip opening peripheral edge of the packaging bag, and the lower and upper block bodies 21 and 22 are chambers. It extends in the lateral direction at the front of the twelve. The lower block body 21 is made of a square pipe member made of aluminum and is provided on the front of the chamber base 13 so as to be removable and vertically movable. A band plate heater 23 made of nichrome material is provided on the upper surface of the lower block body 21. The upper block body 22 is made of elastically deformable silicon, and is provided at the front of the lower surface of the chamber cover 14 at a position facing the upper side of the lower block body 21. Although the heater 23 is provided on the lower block 21, the present invention is not limited to this, and the heater 23 may be provided on the upper block 22 or the upper and lower blocks 21, 22. Good.

  As shown in FIG. 2, at the front of the chamber base 13, a pair of left and right lifting mechanisms 24 (only one is shown in FIG. 2) for moving the lower block body 21 up and down is provided. The lifting mechanism 24 includes a pair of left and right support shafts 25 penetrating the bottom wall of the front of the chamber base 13. The support shafts 25 support the lower block body 21 vertically movably at the front of the chamber base 13. The tip of the support shaft 25 is inserted into the lower portion of the lower block 21, and the support shaft 25 is vertically moved by a pair of elevating cylinders 26 provided at the front of the lower surface of the chamber base 13 at the middle in the vertical direction. It is movably supported. A collar 26a is provided in the elevating cylinder 26 at an intermediate portion of the support shaft 25, and the collar 26a airtightly divides the inside of the elevating cylinder 26 into an upper space 26b and a lower space 26c. A spring 26d is interposed on the outer periphery of the support shaft 25 in the upper space 26b of the elevating cylinder 26, and the spring 26d biases the support shaft 25 downward via the collar 26a.

  As shown in FIG. 2, a suction pipe (suction path) 31 connecting the vacuum pump 30 and the chamber 12 is provided in the housing 11. The vacuum pump 30 is an oil circulation type vacuum pump (oil rotary vacuum pump), and is a positive displacement phase type vacuum pump for reducing the airtightness and ineffective space between components such as a rotor, a stator, and a vane by oil. The suction pipe 31 is provided with a vacuum valve 32. By opening the vacuum valve 32, gas in the chamber 12 can pass to the vacuum pump 30. An external air introduction pipe 33 for introducing external air is connected between the chamber 12 and the vacuum valve 32 to the suction pipe 31. The outside air introduction pipe 33 is composed of a first pipe portion 33a and a second pipe portion 33b branched from the first pipe portion 33a, and the first and second pipe portions 33a, 33b are opened and closed by the first and second pipe portions 33a, 33b. Outside air introduction valves 34, 35 are provided. The first outside air introduction valve 34 is formed to have a larger diameter than the second outside air introduction valve 35, and when the first outside air introduction valve 34 is opened, outside air is introduced quickly into the chamber 12, and the second outside air introduction valve 35 When opened, ambient air is slowly introduced into the chamber 12.

  The pressure detection pipe 36 is connected to the suction pipe 31 via the first pipe portion 33a of the outside air introduction pipe 33, and the pressure detection pipe 36 is provided with a vacuum gauge 37 for detecting the pressure of the chamber 12. When the inside of the chamber 12 is not degassed by the vacuum pump 30, the pressure in the chamber 12 detected by the vacuum gauge 37 is 101 kPa (abs), which is the same as the atmospheric pressure, and the degree of vacuum at this time is 0%. The inside of the chamber 12 is degassed by the vacuum pump 30 to make it underpressure, and when the pressure in the chamber detected by the vacuum gauge 37 is 0 kPa (abs), the degree of vacuum is 100%. Although it is the pressure in the chamber 12 that is directly detected by the vacuum gauge 37, in the following description, the pressure detected by the vacuum gauge 37 is replaced with the degree of vacuum P in the chamber 12 for explanation.

  In the suction pipe 31, a cylinder pipe 38 branched from between the vacuum pump 30 and the vacuum valve 32 is connected to the upper space 26 b of the elevating cylinder 26, and a three-way valve 39 is provided in the cylinder pipe 38. The two ports of the three-way valve 39 are connected to the vacuum pump 30 side of the cylinder tube 38 and the raising and lowering cylinder 26 side, and the remaining one port of the three-way valve 39 is open to the outside air side. Further, a warming up pipe 40 is connected to the suction pipe 31 via a cylinder pipe 38 branched from between the vacuum pump 30 and the vacuum valve 32, and the warming up pipe 40 is opened and closed. A valve 41 is interposed.

  As shown in FIGS. 1 and 2, the vacuum packaging machine 10 is provided with inflation detection means 42 for detecting the inflation of the packaging bag housed in the chamber 12. The bulge detection means 42 is provided with a detection plate (detection member) 43 rotatably supported about a horizontal axis on the lower surface front of the chamber cover 14, and the detection plate 43 In the shape of a strip extending in the The detection plate 43 is disposed on the upper side of the packaging bag housed in the chamber 12 at the rear side of the block members 21 and 22 so that the rear end of the detection plate 43 can move up and down. Is supported on the lower surface of the chamber cover 14. A magnet 44 is provided at the rear end portion at the left end portion which is an end portion in the longitudinal direction of the detection plate 43, and the magnet 44 aims to detect the vertical position of the rear end portion of the detection plate 43 It is a thing. When the packaging bag housed in the chamber 12 is not inflated, the magnet 44 at the rear end of the detection plate 43 is located at the lower portion in the vertical direction in the chamber 12 and after the sensing plate 43 when the packaging bag is inflated. An end magnet 44 is located at the top in the chamber 12.

  On the left side of the housing 11, a position detection sensor 45 comprising a proximity switch such as a reed switch for detecting the vertical position of (the magnet 44 at the rear end of) the detection plate 43 is provided. By detecting the position of the detection plate 43 in the vertical direction, the expansion of the packaging bag is detected. The position detection sensor 45 has a first position detection sensor 45a and a second position detection sensor 45b. The first position detection sensor 45a is located at the lower part outside the chamber 12 at the left side of the housing 11, and is provided at a position opposite to the position when the magnet 44 at the rear end of the detection plate 43 is located at the lowermost position There is. The second position detection sensor 45 b is located on the left side of the housing 11 and at the middle in the vertical direction outside the chamber 12, and the magnet 44 at the rear end of the detection plate 43 rises upward to move the chamber 12 vertically. It is provided at a position opposite to the position slightly above the middle part.

  When the packaging bag in the chamber 12 is not expanded, the magnet 44 at the rear end of the detection plate 43 is located at the lower part in the chamber 12 to face the first position detection sensor 45a (hereinafter simply referred to as the detection plate 43). Is also described in the lower position), and it is possible to detect that the packaging bag is not inflated by the output of the ON signal by the first position detection sensor 45a. In a state where the packaging bag in the chamber 12 is expanded, the magnet 44 at the rear end of the detection plate 43 is at a position facing the second position detection sensor 45b at the middle in the vertical direction in the chamber 12 (hereinafter, The detection plate 43 is also described as being in the middle position), and it is possible to detect that the packaging bag has been inflated by the output of the off signal from the first position detection sensor 45a. When the packaging bag in the chamber 12 is further expanded, the magnet 44 at the rear end of the detection plate 43 is at a position not facing the first and second position detection sensors 45a and 45b at the top in the chamber 12 (hereinafter, It is possible to detect that the packaging bag has further expanded by simply outputting the OFF signals of the first and second position detection sensors 45a and 45b (also described simply as the detection plate 43 is in the upper position).

  As shown in FIG. 3, an operation panel 50 is provided on the front surface of the housing 11, and various operation keys 51 (51 a to 51 d) and display panels 52 (52 a to 52 c) are provided on the operation panel 50. It is done. The "drive" operation key 51a is for making it possible to operate various operation keys 51b to 51d described later. When the "drive" operation key 51a is pressed, the various operation keys 51b to 51d become operable.

  The direct operation keys 51b (51b1 to 51b4) directly select various packaging programs stored in the ROM (storage unit) of the control device 60, which will be described later. Four (multiple) direct operation keys 51b are provided. In this embodiment, the direct operation key (second operation key) 51b1 to which the "hot pack" is attached has a packaging program (packaging program of the second mode) suitable for vacuum-packing an object to be packaged higher than normal temperature. A packaging program (first mode) suitable for vacuum-packing an article to be packaged at ordinary temperature or less on the direct operation keys (first operation keys) 51b2 to 51b4 assigned and having "1" to "3" Packaging program) is assigned.

  The change operation key (third operation key) 51c is used to select the packaging program selected by the direct operation key 51b as another packaging program. In this embodiment, the operation panel 50 is provided with two change operation keys 51c with “∧” and “∨”, and the change operation key 51c with “∧” or “∨” is pressed. When operated, the packaging program stored in order in the ROM (storage unit) of the control device 60 can be changed to forward feed or reverse feed.

  The cancel operation key 51 d is for confirming that the chamber 12 is kept airtight. When the packaging program of the first mode is being executed and the pressing operation of the stop operation key 51d is performed for 3 seconds or longer as an example, the vacuum valve 32 is closed to stop the degassing in the chamber 12 and to execute it. The packaging program in the first mode is temporarily interrupted so that the airtightness in the chamber 12 can be confirmed. The water removal operation key 51 e is an operation key for causing the vacuum pump 30 to drain. When the water removal operation is performed, the vacuum pump 30 is operated so as to degas the inside of the chamber 12. In this water removal operation, it is determined based on the degree of vacuum of the chamber 12 detected by the vacuum gauge 37 whether water mixed in the oil of the vacuum pump 30 has been removed.

  The display panel 52 has a program display unit 52a for displaying the packaging program selected by the direct operation key 51b and the change operation key 51c, and a vacuum degree display unit 52b for displaying the degree of vacuum in the chamber 12 detected by the vacuum gauge 37. And a time display unit 52c for displaying the remaining time until the end of the packaging program. When the packaging program of the first mode is displayed on the program display unit 52a, the program numbers are displayed for "1" to "10" to which the packaging programs of various first modes having different control conditions are assigned, and the program display unit 52a When the two-mode packaging program is displayed, program numbers “H1” to “H2” to which packaging programs of various second modes having different control conditions are assigned are displayed.

  The vacuum packaging machine 10 is provided with a control device 60, and as shown in FIG. 4, this control device 60 includes a proximity switch 17, a heater 23, a vacuum pump 30, a vacuum valve 32, and first and second The external air introduction valves 34 and 35, the vacuum gauge 37, the three-way valve 39, the warming-up valve 41, the first and second position detection sensors 45a and 45b, and the operation panel 50 are connected. The control device 60 includes a microcomputer (not shown), and the microcomputer includes a CPU, a RAM, a ROM, and a timer (all not shown) connected to one another via a bus. The control device 60 is provided with various packaging programs for vacuum-packing the package in the chamber 12 in the ROM, and when the operation panel 50 provided on the front surface of the housing 11 is operated to execute the various packaging programs , Operation of the heater 23, the vacuum pump 30, the vacuum valve 32, the first and second outside air introduction valves 34, 35, and the three-way valve 39 based on the detection of the vacuum gauge 37 and the position detection sensors 45a, 45b, etc. And vacuum package the material in the chamber 12.

  The packaging program stored in the ROM of the control device 60 is the 10 (plural) packaging program of the first mode suitable for the case where the package is at or below normal temperature, and the temperature of the package is higher than the normal temperature When equipped with two (two or more) packaging programs in a second mode suitable. The packaging program of the first mode has 10 types of packaging programs in which the degree of vacuum, the manner of opening the first and second outside air introduction valves 34, 35, and the like are changed in accordance with the material to be packaged. In the second mode of the packaging program, the packaging program for fixing the number of times of in-bag evacuation control is fixed by setting the number of times of in-bag evacuation control for evacuating the air in the packaging bag to one or more predetermined times. And a packaging program capable of controlling the number of times of in-bag evacuation control, wherein the number of times of execution of in-bag evacuation control is variable based on detection of completion of degassing in the packaging bag by a detection program (in-bag degassing detection means).

  The packaging programs of the 10 types (plural types) of the first mode stored in the ROM of the control device 60 are given program numbers of “1” to “10”. When one of the packaging programs in the first mode is selected by the direct operation keys 51b2 to 51b4 and the change operation key 51c is operated, the packaging program in the second mode is selected as the packaging program in the selected first mode The package program of the first mode is stored in the ROM of the control device 60 so that only the other package programs of the first mode can be selected without being locked.

  Specifically, when the packaging program of the first mode with the program number of "1" is selected by the direct operation key 51b2, when the change operation key 51c with the "∨" is operated, "2" A packaging program of the first mode with a program number of “” is selected. Subsequently, when the two change operation keys 51c with “∨” are pressed a plurality of times, “3”, “4”... “10”, “1”, “2”. Only the mode's packaging program is to be selected. Similarly, when the packaging program in the first mode with the program number of "1" is selected by the direct operation key 51b2, pressing the change operation key 51c with "c" a plurality of times, "10 “9”, “8”... “2”, “1”, “10”, “9”... And only the packaging program in the first mode is selected.

  Further, the two types of packaging programs of the second mode stored in the ROM of the control device 60 are given program numbers “H1” to “H2” and one of the packaging programs of the second mode is made by the direct operation key 51b1. When one is selected and the change operation key 51c is operated, the selected second mode packaging program is selected, and only the second mode other packaging program is selected without the first mode packaging program being selected. The second mode of the packaging program is stored in the ROM of the controller 60, as will be possible.

  Specifically, when the packaging program in the second mode with the program number of “H1” is selected by the direct operation key 51b1, when the change operation key 51c with the “∨” is operated, “H2 The second mode packaging program is selected with a program number of "." Subsequently, when the two change operation keys 51c with “∨” are pressed a plurality of times, only the packaging program of the second mode such as “H1”, “H2”, etc. is selected. . Similarly, when the packaging program in the second mode with the program number of "H1" is selected by the direct operation key 51b1, pressing the change operation key 51c with "∧" a plurality of times, "H2 “H1”... And only the second mode packaging program is selected.

  The packaging program of the first and second modes of the vacuum packaging machine 10 will be described with reference to the flowcharts shown in FIGS. As described above, the packaging program of the first mode is a packaging program suitable when the packaged object stored in the packaging bag is at a normal temperature or lower, and the degree of vacuum etc. according to the packaged object stored in the packaging bag The various conditions of have 10 different packaging programs. The 10 types of packaging programs in the first mode generally have only slightly different conditions such as the degree of vacuum, so an example will be described from among the 10 types of packaging programs in the first mode.

  Before executing the packaging program, the vacuum valve 32, the second outside air introduction valve 35, and the warming-up valve 41 are in the closed state, and the three-way valve 39 communicates the elevating cylinder 26 side with the outside air side (vacuum pump 30 Side is closed). Packaged materials such as foodstuffs and food are stored in the packaging bag, and the packaging bag is housed in the chamber 12 so that the opening periphery of the packaging bag is placed on the upper side of the lower block 21. Program display by pressing one of the direct operation keys 51b2 to 51b4 of the operation panel 50 shown in FIG. 3 or operating one of the direct operation keys 51b2 to 51b4 and pressing the change operation key 51c The part 52a is called up with the packaging program of the first mode under the condition suitable for vacuum packaging of the package, and waits for the execution of the packaging program of the first mode.

  As shown in FIG. 5, in step 101, the control device 60 determines whether the on signal is input from the proximity switch 17 and determines whether the chamber cover 14 is closed. When the chamber cover 14 is not closed, the proximity switch 17 outputs the off signal to the controller 60 because the magnet 18 is not close to the proximity switch 17, and the controller 60 determines “NO” in step 101. Execute repeatedly and wait. When the chamber cover 14 is closed and the magnet 18 approaches the proximity switch 17, the proximity switch 17 outputs an ON signal to the controller 60, and the controller 60 determines “YES” in step 101 and proceeds to step 102. . When the controller 60 operates the vacuum pump 30 to open the vacuum valve 32 and close the first outside air introduction valve 34 in step 102, the inside of the chamber 12 is deaerated by the vacuum pump 30 to generate negative pressure. .

  In step 103, the control device 60 repeatedly determines whether or not the degree of vacuum P in the chamber 12 detected by the vacuum gauge 37 is equal to or higher than the degree of vacuum Px specified by the selected first mode packaging program. When the pressure in the chamber 12 gradually decreases and the degree of vacuum P in the chamber 12 detected by the vacuum gauge 37 becomes equal to or higher than the degree of vacuum Px specified by the selected first mode packaging program, the control device 60 At 103, it is determined as “YES”, and the process proceeds to Step 104. In step 104, the controller 60 closes the vacuum valve 32 to stop degassing in the chamber 12 and proceeds to step 105.

In step 105, the control device 60 converts the three-way valve 39 into communication with the elevating cylinder 26 side and the vacuum pump 30 side (closes the outside air side) to make the upper space 26b of the elevating cylinder 26 negative pressure to support the support shaft 25. was elevated to be pressed against the upper block 22 is raised the lower block body 21, clamping causes the opening peripheral edge of the packaging bag and a lower block body 21 and the upper block 22. When the control device 60 causes the heater 23 to generate current by energizing the heater 23 in step 106 where sealing control is performed, the periphery of the opening of the packaging bag is closed by heat welding, and the packaging bag is sealed in a vacuum state.

In step 107, the control device 60 stops the operation of the vacuum pump 30, and opens the first outside air introduction valve 34, so that the three-way valve 39 communicates with the elevating cylinder 26 side and the outside air side (closes the vacuum pump 30 side). State). The inside of the chamber 12 is not degassed by the vacuum pump 30 and returned to the atmospheric pressure by the outside air introduced from the first outside air introduction valve 34, and the chamber cover 14 is released by the biasing force of the spring member without being evacuated. . Further, external air is introduced into the upper space 26b of the lifting cylinder 26 by bringing the three-way valve 39 into communication with the lifting cylinder 26 side and the outside air side, and the negative pressure state is released, and the support shaft 25 is biased by the spring 26d. lowered by the lower block body 21 is spaced from the upper block body 22, (closed) opening portion of the packaging bag is a state of being sandwiched from upper and lower blocks 21, 22 is released. The first and second external air introduction valves 34 may be opened and then the first external air introduction valve 34 may be opened according to the control of the 10 (plural) first mode packaging programs. The release of degassing in the chamber 12 may be controlled by controlling the opening of the external air introduction valves 34 and 35. Further, in the following description, the description for raising or lowering the lower block body 21 is the same as the operation of the three-way valve 39 and the elevating cylinder 26 in the steps 105 and 107, so the detailed description is omitted. There is also a case.

  Next, a second mode of packaging program will be described which is suitable when the material to be packaged stored in the packaging bag is higher than normal temperature. As described above, the second mode of the packaging program is a packaging program for fixing the number of times of in-bag evacuation control which fixes the in-bag evacuation control for evacuating air in the packaging bag And a packaging program capable of varying the number of times of in-bag evacuation control, wherein the number of times of execution of the in-bag evacuation control is variable based on detection of completion of degassing in the packaging bag by the detection means). A packaging program with a fixed number of times for controlling the number of times of in-bag evacuation control in the second mode is a packaging program suitable for being executed when a material to be packaged which can reliably discharge the gas from inside the packaging bag is stored in the packaging bag It is a packaging program suitable for vacuum-packing a package with a small amount of liquid, such as hamburger meat, roast beef or boiled with a small amount of juice as an example of the package. The packaging program with variable number of times of in-bag evacuation control in the second mode is a packaging program suitable for being executed when a package to which it is difficult to know how much gas is contained is stored in a packaging bag. It is a packaging program suitable for vacuum-packing a package with a large amount of liquid such as stew or soup as an example of the product.

  First, the packaging program for fixing the number of times of in-bag evacuation control in the second mode will be described. Before executing the second mode packaging program, the vacuum valve 32, the second outside air introduction valve 35, and the warming-up valve 41 are in the closed state as in the first mode packaging program. The three-way valve 39 is in a state of communication between the elevating cylinder 26 side and the outside air side (the vacuum pump 30 side is closed). Packaged materials such as foodstuffs and food are stored in the packaging bag, and the packaging bag is housed in the chamber 12 so that the opening periphery of the packaging bag is placed on the upper side of the lower block 21. Pressing the direct operation key 51b1 of the operation panel 50 shown in FIG. 3 calls the packaging display program with the fixed number of in-bag evacuation control times in the second mode to the program display unit 52a, and the number of times of in-bag evacuation control in the second mode fixed Wait for the execution of the packaging program.

  As shown in FIG. 6, in step 201, the control device 60 determines whether or not the on signal is input from the proximity switch 17, and determines whether or not the chamber cover 14 is closed. When the chamber cover 14 is not closed, the proximity switch 17 outputs the off signal to the controller 60 because the magnet 18 is not close to the proximity switch 17, and the controller 60 repeats “NO” in step 201. judge. When the chamber cover 14 is closed and the magnet 18 approaches the proximity switch 17 while the controller 60 repeatedly executes the process of step 201, the proximity switch 17 outputs an ON signal to the controller 60, and the controller In step 201, it is determined “YES” in step 201, and the process proceeds to step 202.

  If an excessive amount of material is contained in the packaging bag contained in the chamber 12, the detection plate 43 is at the middle position and the upper position before the inside of the chamber 12 is degassed and negative pressured. May be located. When the detection plate 43 is positioned at the middle position or the upper position, the expansion detection means 42 may not be able to detect the expansion of the packaging bag when the inside of the chamber 12 is deaerated and negative pressure is generated. Therefore, in step 202, the control device 60 determines whether the detection plate 43 is at the lower position by determining whether the on signal is input from the first position detection sensor 45a. If the ON signal is not input from the first position detection sensor 45a, the control device 60 determines "NO" in step 202, and an error is generated in the program display unit 52a or the time display unit 52c of the display panel 52 in step 203. Is displayed and the process returns to step 201. The control device 60 may notify of an error by a sound such as a buzzer instead of the display of the error in step 203. On the other hand, when the appropriate amount of the package is stored in the packaging bag (the excess amount of the package is not stored in the packaging bag), the ON signal is output from the first position detection sensor 45a. As a result, the controller 60 determines “YES” in step 202 and proceeds to step 204. In step 204, the control device 60 sets the number of times of execution of in-bag evacuation control R described later to 0, and advances to in-chamber deaeration control starting from step 205.

In step 205, the control device 60 operates the vacuum pump 30, opens the vacuum valve 32, closes the first outside air introduction valve 34, and at the same time, the three-way valve 39 on the elevating cylinder 26 side and the vacuum pump 30 side. Are in the communication state (the outside air side is in the closed state). The inside of the chamber 12 is deaerated by the vacuum pump 30 to be negative pressure. Further, the upper space 26b of the elevating cylinder 26 is also made negative pressure, the support shaft 25 is raised, the lower block 21 is raised and pressed against the upper block 22, and the peripheral edge of the opening of the packaging bag is the lower block The opening of the packaging bag is temporarily closed by being pinched by the upper block body 21 and the upper block body 22.

  When the opening of the packaging bag in the chamber 12 is temporarily closed by the process of step 205, the inside of the chamber 12 is deaerated and negatively pressurized, and the controller 60 sets the first position in step 206 to a first position. The detection plate 43 is at the middle position or the upper position based on the presence or absence of the input of the off signal from the detection sensor 45a or the input of the off signal from the first and second position detection sensors 45a and 45b, ie, the packaging bag is It is determined whether it has expanded. The controller 60 repeatedly executes the determination of “NO” in step 206 until the packaging bag is expanded until the detection plate 43 is pushed up to the middle position or the upper position. The packaging bag pushes up the detection plate 43 to the middle position or the upper position by the negative pressure in the chamber 12, and the controller 60 receives an off signal from the first position detection sensor 45a, or the first and second position detection sensors. When an off signal is input from 45a and 45b, the control device 60 determines “YES” in step 206 and proceeds to step 207.

  In step 207, the controller 60 closes the vacuum valve 32 to temporarily interrupt degassing in the chamber 12, and stores the degree of vacuum P detected by the vacuum gauge 37 in the RAM. Next, in step 208, the control device 60 determines whether the in-bag evacuation control to be described below has been executed five times or more. If the in-bag evacuation control has not been performed five times or more, the control device 60 determines “NO” to execute the in-bag evacuation control starting from step 209.

  In step 209, the control device 60 lowers the lower block body 21 by bringing the three-way valve 39 into communication with the elevating cylinder 26 side and the outside air side (vacuum pump 30 side closed). By lowering the lower block body 21, the opening of the packaging bag is opened, and the gas filled in the packaging bag is discharged into the chamber 12. The controller 60 opens the vacuum valve 32 for an additional time in step 210, further discharges the internal gas from the opening of the packaging bag, and waits for 5 seconds in step 211. The opening at the additional time of the vacuum valve 32 in this step 210 can be set to 0 seconds, that is, even when the vacuum valve 32 is not opened, the degassing time suitable for the package can be set. That is, if the material to be packaged contains a large amount of liquid liable to be blown out of the packaging bag, it is preferable to set the opening time of the vacuum valve 32 for an additional time to a very short time of about 0 seconds or 1 to 2 seconds, If the material to be packaged is a liquid which is less likely to be spilled out of the packaging bag, it is preferable to set the open time of the vacuum valve 32 for an additional time to a short time of about 3 to 5 seconds. Next, in step 212, the control device 60 adds 1 to the number of executions R as the number of executions of in-bag evacuation control R = R + 1, and proceeds to step 213.

  The controller 60 executes in-chamber intake control so as to temporarily intake air into the chamber 12 at step 213. The in-chamber intake control is intended to prevent the inability to detect the expansion of the packaging bag in the subsequent processing if the packaged material is in a boiling state in the packaging bag, and the chamber 12 External air is introduced inside to reduce the degree of vacuum. The control device 60 performs this in-chamber intake control at step 213. The predetermined first degree of vacuum lower than the degree of vacuum P detected at step 207 is 10% from the degree of vacuum P (10% is an example, The second outside air introduction valve 35 is opened to a reduced value (not limited to this) to introduce outside air into the chamber 12.

  When the first vacuum degree is lower than the lower limit (for example, 30%) in step 213 of performing in-chamber intake control, the second outside air introduction valve 35 is opened to the lower limit to introduce outside air into the chamber 12. Control to do so. The lower limit value is set to the first degree of vacuum, for example, in order to prevent the chamber cover 14 from being opened without being suctioned negative pressure while the packaging program is being executed.

  In step 214, the controller 60 opens the vacuum valve 32, degassing the inside of the chamber 12 to the degree of vacuum P detected and stored in the RAM at the timing of step 207. Since the degree of vacuum P detected at the timing of step 207 is the degree of vacuum until the packaged material in the packaging bag is inflated to such an extent that the material in the packaging bag will not be blown out, detection is made in step 207 with the packaging bag opened. Even if the inside of the chamber 12 is degassed to the vacuum degree P, the material in the packaging bag will not be blown out. Although the inside of the chamber 12 is deaerated until the degree of vacuum P detected and stored in the RAM at the timing of the step 207 in the step 214, the invention is not limited thereto. The inside of the chamber 12 may be degassed to a degree of vacuum P-5% obtained by subtracting a degree of vacuum of, for example, 5% as a predetermined value from the degree of vacuum P stored therein. In this case, since the inside of the chamber 12 is decompressed only to a vacuum degree P-5% lower than the vacuum degree P described above, it is possible to ensure that a sudden boil over of the material in the packaging bag does not occur. .

After the processing of step 214, the control device 60 returns to step 205 and lifts the lower block 21 and presses it against the upper block 22 so that the periphery of the opening of the packaging bag is the lower block 21 and the upper block 22. It is not an opening of the packaging bag again temporarily closed sandwiched between. After the processing of step 214, the vacuum pump 30 is in operation, the vacuum valve 32 is opened, and the first outside air introduction valve 34 is closed. Continuously operating, the vacuum valve 32 is opened and the first outside air introduction valve 34 remains closed. After returning from step 214 to step 205, the control device 60 repeatedly executes the processing of steps 205 to 215 so that the number of times of execution of the in-bag evacuation control of steps 210 to 215 is five or more.

When the in-bag evacuation control has been performed five times, the control device 60 determines “YES” in step 208 and proceeds to step 215. The controller 60 lowers the lower block body 21 in step 215 as the final in-bag evacuation control, and waits for 5 seconds in step 216 to discharge the gas remaining in the packaging bag. In step 217, the control device 60 raises the lower block body 21 until it is pressed against the upper block body 22, and the peripheral edge of the opening of the packaging bag is sandwiched by the lower block body 21 and the upper block body 22 Close the opening of. At step 218 where sealing control is performed, the control device 60 energizes the heater 23 to seal the periphery of the opening of the packaging bag by heat welding to seal the packaging bag. In step 219, the control device 60 stops the operation of the vacuum pump 30, and releases the negative pressure state in the chamber 12 by opening the first outside air introduction valve 34, and lowers the lower block body 21. Then, the packaging program with the number of times of in-bag evacuation control fixed in the second mode is fixed.

  Next, the packaging program with variable number of times of in-bag evacuation control in the second mode will be described. Before executing the second mode packaging program, the vacuum valve 32, the second outside air introduction valve 35, and the warming-up valve 41 are in the closed state as in the first mode packaging program. The three-way valve 39 is in a state of communication between the elevating cylinder 26 side and the outside air side (the vacuum pump 30 side is closed). Packaged materials such as foodstuffs and food are stored in the packaging bag, and the packaging bag is housed in the chamber 12 so that the opening periphery of the packaging bag is placed on the upper side of the lower block 21. Pressing the direct operation key 51b1 and the change operation key 51c of the operation panel 50 shown in FIG. 3 to call the packaging program with variable number of times of in-bag evacuation control in the second mode to the program display unit 52a The execution of the packaging program with variable number of times of in-bag evacuation control is put on standby.

  In step 301, the controller 60 determines whether the on signal is input from the proximity switch 17, and determines whether the chamber cover 14 is closed. When the chamber cover 14 is not closed, the proximity switch 17 outputs the off signal to the controller 60 because the magnet 18 is not close to the proximity switch 17, and the controller 60 repeats “NO” in step 301. judge. When the chamber cover 14 is closed and the magnet 18 approaches the proximity switch 17 while the controller 60 repeatedly executes the process of step 301, the proximity switch 17 outputs an ON signal to the controller 60, and the controller At step 301, it is judged as "YES" at step 301, and the process proceeds to step 302.

  If an excessive amount of material is contained in the packaging bag contained in the chamber 12, the detection plate 43 is at the middle position and the upper position before the inside of the chamber 12 is degassed and negative pressured. May be located. When the detection plate 43 is positioned at the middle position or the upper position, the expansion detection means 42 may not be able to detect the expansion of the packaging bag when the inside of the chamber 12 is deaerated and negative pressure is generated. Therefore, in step 302, the control device 60 determines whether the detection plate 43 is at the lower position by determining whether the on signal is input from the first position detection sensor 45a. If the ON signal is not input from the first position detection sensor 45a, the control device 60 determines “NO” in step 302, and an error is generated in the program display unit 52a or the time display unit 52c of the display panel 52 in step 303. Make the display of. After the processing of step 303, the control device 60 returns to step 301. The control device 60 may notify of an error by a sound such as a buzzer instead of the display of the error in step 303. On the other hand, when the appropriate amount of the package is stored in the packaging bag (the excess amount of the package is not stored in the packaging bag), the ON signal is output from the first position detection sensor 45a. As it is input, the controller 60 determines “YES” in step 302 and proceeds to in-chamber deaeration control starting from step 304.

In step 304, the control device 60 operates the vacuum pump 30, opens the vacuum valve 32, closes the first outside air introduction valve 34, and at the same time, the three-way valve 39 on the elevating cylinder 26 side and the vacuum pump 30 side. Are in the communication state (the outside air side is in the closed state). The inside of the chamber 12 is deaerated by the vacuum pump 30 to be negative pressure. Further, the upper space 26b of the elevating cylinder 26 is also made negative pressure, the support shaft 25 is raised, the lower block 21 is raised and pressed against the upper block 22, and the peripheral edge of the opening of the packaging bag is the lower block The opening of the packaging bag is temporarily closed by being pinched by the upper block body 21 and the upper block body 22.

  When the processing of step 304 temporarily degasses the inside of the chamber 12 with negative pressure while the opening of the packaging bag in the chamber 12 is temporarily closed, in step 305, the control device 60 performs the first position. Based on the presence / absence of the input of the off signal from the detection sensor 45a, it is determined whether the detection plate 43 is in the middle position, that is, whether the packaging bag has expanded. The control device 60 repeatedly executes “NO” determination in step 305 until the packaging bag is expanded until the detection plate 43 is pushed up to the middle position. When the packaging bag pushes up the detection plate 43 to the middle position due to the negative pressure in the chamber 12 and the control device 60 receives an off signal from the first position detection sensor 45 a, the control device 60 sets “Step 305” The determination is “YES”, and the process proceeds to step 306.

  In step 306, the controller 60 closes the vacuum valve 32 to temporarily interrupt degassing in the chamber 12, and stores the degree of vacuum P detected by the vacuum gauge 37 in the RAM.

  Next, in step 307, the control device 60 determines whether or not degassing of the packaging bag has been completed by the in-bag degassing detection program (in-bag degassing detection means). The control device 60 sets the detection plate 43 in the lower position (the packaging bag is in the first state) to the middle position (the packaging bag is in the second state) in the step 305 as the degassing detection means in the step 307. Degassing in the packaging bag is completed by determining whether or not the detection plate 43 has reached the upper position (the packaging bag is in the third state) within 0.5 seconds as the predetermined time after closing the vacuum valve 32. It is determined whether or not it has. When the inside of the packaging bag is not sufficiently degassed, the closed packaging bag is expanded by the expansion of the internal gas with the negative pressure of the chamber 12, and the packaging bag is in such a degree that the detection plate 43 is at the middle position. If the degassing in the chamber 12 is interrupted when the pressure in the chamber 12 is inflated, the pressure in the chamber 12 is kept constant, so that the packaging bag can no longer inflate and the detection plate 43 can not be pushed up to the upper position. On the other hand, when the inside of the packaging bag is sufficiently degassed, the closed packaging bag is expanded by negative pressure in the chamber 12 and water vapor contained in the package is evaporated, and the detection plate 43 is Even if the degassing in the chamber 12 is interrupted when the packaging bag is inflated to an intermediate position, the evaporation of the water contained in the package does not immediately settle, and the detection bag 43 continues to expand the packaging bag. Push up to the upper position.

  If the inside of the packaging bag can not be sufficiently deaerated, the detection plate 43 is in the middle position in step 305 and the vacuum valve 32 is closed in step 306 after the detection plate 43 is within 0.5 seconds as the predetermined time. Since the second position detection sensor 45b continues to input an ON signal to the control device 60, the control device 60 determines “NO” in step 307 and proceeds to step In-bag evacuation control starting at 308 is performed. It should be noted that it is determined that "YES" is determined in step 307 by erroneously detecting that the detection plate 43 is pushed up to the upper position within 0.5 seconds without executing the in-bag evacuation control even once. In order to prevent this, before or after the process of step 307, it may be determined whether the in-bag evacuation control has been performed once (or twice) or more.

  In step 308, the control device 60 lowers the lower block body 21 by bringing the three-way valve 39 into communication with the elevating cylinder 26 side and the outside air side (vacuum pump 30 side closed). By lowering the lower block body 21, the opening of the packaging bag is opened, and the gas filled in the packaging bag is discharged into the chamber 12. The controller 60 opens the vacuum valve 32 for an additional time in step 309, further discharges the internal gas from the opening of the packaging bag, and waits for 5 seconds in step 310. The opening at the additional time of the vacuum valve 32 in this step 309 is 0 seconds, that is, even when the vacuum valve 32 is not opened, the degassing time suitable for the package can be set. That is, if the material to be packaged contains a large amount of liquid liable to be blown out of the packaging bag, it is preferable to set the opening time of the vacuum valve 32 for an additional time to a very short time of about 0 seconds or 1 to 2 seconds, If the package has less liquid which is difficult to spill out of the packaging bag, it is preferable to set the opening time of the additional time of the vacuum valve 32 to a short time of about 3 to 5 seconds.

  The controller 60 executes in-chamber intake control so as to temporarily intake air into the chamber 12 at step 311. The in-chamber intake control is intended to prevent the inability to detect the expansion of the packaging bag in the subsequent processing if the packaged material is in a boiling state in the packaging bag, and the chamber 12 External air is introduced inside to reduce the degree of vacuum. The controller 60 executes step S311 for performing in-chamber intake control, and the predetermined degree of vacuum lower than the degree of vacuum P detected in step 306 is 10% from the degree of vacuum P (10% is an example, The second outside air introduction valve 35 is opened to a reduced value (not limited to this) to introduce outside air into the chamber 12.

  When the first vacuum degree is equal to or less than the lower limit (for example, 30%) in step 311 for performing in-chamber intake control, the second outside air introduction valve 35 is opened to the lower limit to introduce outside air into the chamber 12. Control to do so. The lower limit value is set to the first degree of vacuum, for example, in order to prevent the chamber cover 14 from being opened without being suctioned negative pressure while the packaging program is being executed.

  In step 312, the controller 60 opens the vacuum valve 32, degassing the inside of the chamber 12 to the degree of vacuum P detected and stored in the RAM at the timing of step 306. Since the degree of vacuum P detected at the timing of step 306 is the degree of vacuum until the package in the packaging bag is inflated to the extent that the material in the packaging bag is not blown out, the detection is made in step 306 with the packaging bag open. Even if the inside of the chamber 12 is degassed to the vacuum degree P, the material in the packaging bag will not be blown out. Although the inside of the chamber 12 is deaerated to the degree of vacuum P detected and stored in the RAM at the timing of the step 306 in the step 312, the present invention is not limited to this. The inside of the chamber 12 may be deaerated to a degree of vacuum P-5% obtained by subtracting a degree of vacuum of, for example, 5% as a predetermined value from the degree of vacuum P stored. In this case, since the inside of the chamber 12 is decompressed only to a vacuum degree P-5% lower than the vacuum degree P described above, it is possible to ensure that a sudden boil over of the material in the packaging bag does not occur. .

After the processing of step 312, the control device 60 returns to step 304, lifts the lower block 21 and presses it against the upper block 22, and the peripheral edge of the opening of the packaging bag is the lower block 21 and the upper block 22. It is not an opening of the packaging bag again temporarily closed sandwiched between. Since the vacuum pump 30 is in operation after the processing of step 312, the vacuum valve 32 is opened, and the first outside air introduction valve 34 is closed, the vacuum pump 30 is also returned when returning to step 304. Continuously operating, the vacuum valve 32 is opened and the first outside air introduction valve 34 remains closed. After returning from step 312 to step 304, the control device 60 determines in step 307 whether or not degassing of the packaging bag by the degassing detection program in the bag is completed, and degassing of the packaging bag is completed. If not, the in-bag evacuation control of steps 308 to 312 is executed.

  If the inside of the packaging bag can be sufficiently degassed while performing the processing of steps 304 to 312, the detection plate 43 detects the middle position at step 305 and immediately (within 0.5 seconds) the upper position. It will be pushed up. At this time, the on signal input from the second position detection sensor 45b is changed to the off signal of the first and second position detection sensors 45a and 45b within 0.5 seconds and is input to the control device 60. The controller 60 determines “YES” in step 307 and proceeds to step 313.

The controller 60 lowers the lower block body 21 in step 313 as the final in-bag evacuation control, and waits for 5 seconds in step 314 to discharge the gas remaining in the packaging bag. In step 315, the control device 60 raises the lower block body 21 until it is pressed against the upper block body 22, and the peripheral edge of the opening of the packaging bag is sandwiched by the lower block body 21 and the upper block body 22 Close the opening of. In step 316 where sealing control is performed, the control device 60 energizes the heater 23 to seal the periphery of the opening of the packaging bag by heat welding to seal the packaging bag. In step 317, the controller 60 stops the operation of the vacuum pump 30, and releases the negative pressure state in the chamber 12 by opening the first outside air introduction valve 34, and lowers the lower block body 21. Then, the packaging program with variable number of times of in-bag evacuation control in the second mode is ended.

  Further, when the control device 60 stands by for the execution request of the packaging program of the first and second modes in the power-on state, setting control of execution of the airtightness detection program and control of the vacuum pump 30 The execution control of the warm-up operation (the operation of evaporating the water from the oil of the vacuum pump 30 and removing it by operating the vacuum pump 30) is performed. The airtightness detection program is a program for temporarily interrupting the packaging program so as to stop the degassing in the chamber 12 by the vacuum pump 30, and to detect that the inside of the chamber 12 is airtight. Specifically, the airtightness detection program is configured to close the vacuum valve 32 and stop the deaeration of the chamber 12 by the vacuum pump 30 when the packaging program (the first mode packaging program) is being executed. By temporarily interrupting the packaging program and visually confirming that the detection value of the degree of vacuum in the chamber 12 by the vacuum gauge 37 displayed on the vacuum degree display unit 52b of the display panel 52 does not decrease, the chamber 12 is displayed. It is a program for detecting that the inside is airtight. The control device 60 may determine whether or not the airtight state in the chamber 12 is maintained based on the detection value of the vacuum gauge 37 input to the control device 60, and may notify the chamber Based on the fact that the cover 14 is released from the chamber base 13, it may be possible to confirm that the inside of the chamber 12 is not airtight. The airtightness detection program is executed when the cancel operation key 51d of the operation panel 50 is pressed for 3 seconds or more. The control device 60 can execute the airtightness detection program only when the packaging program of the first mode is being executed, and controls so that the airtightness detection program can not be executed when the packaging program of the second mode is performed. There is.

  Further, the execution control of the warm-up operation of the vacuum pump 30 is controlled to automatically execute the warm-up operation based on the execution of the packaging program of the second mode. Since the second mode of the packaging program is intended to vacuum-pack a package having a temperature higher than normal temperature in the packaging bag, the process of degassing the inside of the packaging bag when the second mode of the packaging program is executed In this case, a large amount of steam (water vapor) is generated from the package. The generated vapor is released into the chamber 12 and mixes with the oil of the vacuum pump 30 that degasses the chamber 12. When water is mixed in the oil of the vacuum pump 30, the vacuum pump 30 can not deaerate the inside of the chamber 12 to an appropriate pressure (the degassing ability is reduced), or the parts of the vacuum pump 30 are contained in the oil It will deteriorate such as rusting. For this reason, in this vacuum packaging machine 10 provided with a second mode packaging program for vacuum-packaging a package having a temperature higher than normal temperature in the packaging bag, the vacuum pump 30 is used for the purpose of eliminating oil deterioration. The execution control of the warm-up operation of the vacuum pump 30 is executed while waiting for the execution request. Note that the warm-up operation of the vacuum pump 30 does not operate the vacuum pump 30 while degassing the chamber 12 with the vacuum valve 32 open as in the water removal operation, and only the warm-up valve 41 is opened. In this state, the vacuum pump 30 is operated. When the warm-up valve 41 is opened to operate the vacuum pump 30, the water contained in the oil of the vacuum pump 30 is vaporized and removed. When the warm-up operation is performed, the vacuum valve 32 and the first or second outside air introduction valve 34, 35 are opened as other valves without opening the warm-up valve 41, and the vacuum pump 30 is started. You may take in the outside air.

  In the following, setting control of execution of the airtightness detection program when waiting for the execution request of the packaging program and execution control of the warm-up operation of the vacuum pump 30 will be described using flowcharts. As shown in FIG. 8, after the power is turned on, the control device 60 executes the control program starting from step 401. In step 401, the execution request for the packaging program in the second mode is made during warm-up operation described later. If it is, the warm-up operation is interrupted and the number of times of execution of the packaging program of the second mode is counted.

  The control device 60 determines in step 402 whether or not there is a demand for execution of the packaging program, and repeatedly determines “NO” if there is no demand for execution of the packaging program. After the operator operates the various operation keys 51 of the operation panel 50 to select the packaging program, the chamber cover 14 is closed and the proximity switch 17 is caused to output an ON signal to thereby select the packaging program of the first or second mode. When the execution request is input to the control device 60, the control device 60 determines “YES” in step 402 and proceeds to step 403. In step 403, the control device 60 determines whether the input execution request for the packaging program is the execution request for the packaging program in the second mode. If the input execution request for the packaging program is an execution request for the packaging program in the second mode, the control device 60 determines “YES” in step 403 and proceeds to step 404.

  In step 404, the control device 60 sets the airtightness detection program to an unexecutable state. In a state in which the airtightness detection program can not be executed, the packaging program is set so as not to be interrupted even if the cancel operation key 51d of the operation panel 50 is pressed for 3 seconds or more. The control device 60 executes the packaging program in the second mode requested to be executed in step 405 while the airtightness detection program in step 404 can not be executed. The packaging program of the second mode is the packaging program of the second mode which is fixed or variable in the number of times of controlling the in-bag exhaust control shown in FIGS. When the packaging program in the second mode ends, the airtightness detection program is released from the non-executable state, and the process proceeds to step 406. The control device 60 determines the warm-up operation time based on the number of times of the counter unit of the RAM. In this embodiment, the warm-up operation time is 2 minutes up to 0 to 10 times, the warm-up operation time is 3 minutes up to 11 to 20 times, and the warm-up operation time is 4 to 21 to 30 times Minutes, 31 times or more are set as 5 minutes. Note that the number of times of the counter unit may be set to be extended by 5 seconds each time.

  On the other hand, after the operator operates the various operation keys 51 of the operation panel 50 to select the packaging program of the first mode, the chamber cover 14 is closed and the proximity switch 17 outputs the on signal. When the execution request for the packaging program of the mode is input to the control device 60, the control device 60 determines “NO” in step 402 and proceeds to step 407. In step 407, the control device 60 executes the packaging program of the first mode requested to be executed. The packaging program of the first mode is the packaging program of the first mode shown in FIG. 5 described above. When the packaging program of the first mode is executed in step 407, since the airtightness detection program is not set to the unexecutable state as in step 404, the cancel operation key 51d of the operation panel 50 is pressed for 3 seconds or more. Then, the vacuum valve 32 is closed to temporarily interrupt the packaging program in the first mode being executed so that the vacuum pump 30 stops the degassing of the chamber 12. The vacuum level indicator 52b of the display panel 52 displays the detected value of the vacuum level in the chamber 12 by the vacuum gauge 37, and visually confirms that the vacuum level displayed on the vacuum level indicator 52b does not decrease. By doing this, it is possible to confirm that the inside of the chamber 12 is airtight. The first operation was interrupted when, for example, 30 seconds passed as a predetermined time after the stop operation key 51d was pressed again for 3 seconds or more, or after temporarily stopping the packaging program in the first mode. Resume the mode's packaging program. After executing the packaging program of the first mode in step 407, the control device 60 proceeds to step 408, and determines in step 408 the remaining warm-up operation time RT stored in the RAM described later as the warm-up operation time. Proceed to 409.

  When the warm-up operation time is determined in step 406 or step 408 after the execution of the packaging program in the first or second mode, the controller 60 starts the warm-up operation of the vacuum pump 30 in step 409 at the same time. Start timing by the timer. After the start of the warm-up operation, in step 410, the control device 60 determines whether the time measured by the timer has exceeded the warm-up operation time. If the warm-up operation time has not elapsed, the control device 60 determines “NO” in step 410 and proceeds to step 411. In step 411, the control device 60 selects a packaging program from the various operation keys 51 of the operation panel 50, closes the chamber cover 14, and outputs a request to execute the packaging program by causing the proximity switch 17 to output an on signal. If it is determined that the packaging program execution request has not been input, it is determined "NO" and the process returns to step S410. If the execution request of the packaging program is input while repeatedly executing the processing of step 410 and step 411 during warm-up operation, the control device 60 determines “YES” in step 411 and step 412 Advance to

  In step 412, the control device 60 determines whether the packaging program requested to be executed in step 411 is the packaging program in the second mode, and if the packaging program requested to be executed is the packaging program in the second mode The determination is “YES”, and the process proceeds to step 413. The control device 60 adds the number of times of the counter unit of the RAM at step 413 one time, and proceeds to step 415 to stop the warm-up operation of the vacuum pump 30. On the other hand, if the packaging program requested to be executed at step 411 is the packaging program of the first mode, the control device 60 determines “NO” at step 412 and proceeds to step 414. In step 414, the control device 60 stores the remaining warm-up operation time RT in the RAM from the time counted by the timer, and proceeds to step 415 to stop the warm-up operation of the vacuum pump 30. After stopping the warm-up operation of the vacuum pump 30 in step 415, the control device 60 returns to step 403 and executes the above-described processing starting from step 403 again.

  When there is a demand for execution of the packaging program of the second mode until the warm-up operation time has elapsed, the number of times of the counter section of the RAM is incremented by 1 (step 413) to interrupt the warm-up operation of the vacuum pump 30 (Step 415), the second mode packaging program is executed (step 405). The warm-up operation time after execution of the packaging program of the second mode is set to a time corresponding to the number of times of the counter section of the RAM (step 406). On the other hand, when there is a demand for execution of the packaging program of the first mode until the warm-up operation time elapses, the remaining warm-up operation time RT is stored in the RAM (step 414). The machine operation is interrupted (step 415), and the first mode packaging program is executed (step 407). The remaining warm-up operation time RT stored in the RAM is set as the warm-up operation time after execution of the packaging program in the first mode (step 408).

  When there is no request for execution of the packaging program in the first or second mode and the warm-up operation time has elapsed, the control device 60 determines “YES” in step 410 and proceeds to step 416. In step 416, the control device 60 returns the number of times of the counter unit of the RAM to 0, sets the remaining warm-up operation time RT of the RAM to 0, and stops the warm-up operation of the vacuum pump 30 in step 417. After stopping the warm-up operation of the vacuum pump 30 in step 417, the control device 60 returns to step 402 again to wait until the execution of the packaging program is requested.

  When the packaging program of the second mode is not executed at all or when the remaining warm-up operation time RT stored in the RAM is 0, the packaging program of the first mode is executed (step 407), Since the remaining warm-up operation time RT is 0, the warm-up operation time is also set to 0 (step 408), and the vacuum pump 30 is substantially warmed up via steps 409, 410, 416 and 417. It is not controlled.

  As described above, since the warm-up operation of the vacuum pump 30 is controlled based on the execution of the second mode packaging program in which water easily mixes with the oil of the vacuum pump 30, the oil of the vacuum pump 30 is controlled. Water contained in water can be reliably removed.

  Next, execution control of the other warm-up operation of the vacuum pump 30 will be described (the control of setting of the executability of the airtightness detection program is the same as the flowchart of FIG. 8, so detailed description is omitted). As shown in FIG. 9, after the power is turned on, the control device 60 executes the control program starting from step 501, and in step 501, when there is a demand to execute the packaging program during the warm-up operation described later The remaining warm-up operation time RT remaining when the warm-up operation is interrupted is reset to 0, and the process proceeds to step 502.

  The control device 60 determines in step 502 whether or not there is a demand for execution of the packaging program, and if there is no demand for execution of the packaging program, repeatedly determines “NO”. After the operator operates the various operation keys 51 of the operation panel 50 to select the packaging program, the chamber cover 14 is closed and the proximity switch 17 is caused to output an ON signal to thereby select the packaging program of the first or second mode. When the execution request is input to the control device 60, the control device 60 determines “YES” in step 502 and proceeds to step 503. In step 503, the control device 60 determines whether the input execution request for the packaging program is an execution request for the packaging program in the second mode. If the input execution request for the packaging program is an execution request for the packaging program in the second mode, the control device 60 determines “YES” in step 503 and proceeds to step 504.

  In step 504, the control device 60 sets the airtightness detection program to the non-executable state as in step 404 described above. The control device 60 executes the packaging program in the second mode requested to be executed in step 505 in a state where the airtightness detection program in step 504 can not be executed. When the packaging program in the second mode ends, the airtightness detection program is released from the non-executable state, and the process proceeds to step 506. In step 506, the control device 60 adds the addition time AT (for example, 2 minutes) to be added each time the packaging program of the second mode is executed once and the remaining warm-up operation time RT stored in the RAM. Set the warm-up operation time. In addition, it is preferable to provide an upper limit time (for example, 10 minutes) in this warm-up operation time.

  On the other hand, after the operator operates the various operation keys 51 of the operation panel 50 to select the packaging program of the first mode, the chamber cover 14 is closed and the proximity switch 17 outputs the on signal. When the execution request for the packaging program of the mode is input to the control device 60, the control device 60 determines “NO” in step 503 and proceeds to step 507. At step 507, the control device 60 executes the packaging program of the first mode requested to be executed, and proceeds to step 508. At step 508, control device 60 determines the remaining warm-up operation time RT stored in the RAM described later as the warm-up operation time, and proceeds to step 509.

  When the warm-up operation time is set in step 506 or step 508 after execution of the packaging program in the first or second mode, the controller 60 starts the warm-up operation of the vacuum pump 30 in step 509 simultaneously. Start timing by the timer. After the start of the warm-up operation, in step 510, the control device 60 determines whether the time measured by the timer has passed the warm-up operation time. If the warm-up operation time has not elapsed, the control device 60 determines “NO” in step 510 and proceeds to step 511. In step 511, the control device 60 selects a package program from the various operation keys 51 of the operation panel 50, closes the chamber cover 14, and outputs an ON signal from the proximity switch 17 whether a package program execution request has been input If it is determined that the packaging program execution request has not been input, it is determined "NO" and the process returns to step 510. If the execution request of the packaging program is input while repeatedly executing the processing of step 510 and step 511 during the warm-up operation, the control device 60 determines “YES” in step 511 and step 512 Advance to

  In step 512, the control device 60 stores the remaining warm-up operation time RT in the RAM from the time counted by the timer, and proceeds to step 513 to stop the warm-up operation of the vacuum pump 30. After stopping the warm-up operation of the vacuum pump 30 in step 513, the control device 60 returns to step 503, and executes the above-described processing starting from step 503 again.

  When there is a demand for execution of the packaging program in the first or second mode until the warm-up operation time elapses, the remaining warm-up operation time RT is stored in the RAM (step 512), and the vacuum pump 30 is warmed up. The operation is interrupted (step 513), and the first or second packaging program is executed (step 505 or 507). The warm-up operation time after the execution of the packaging program of the second mode is the addition time AT which is added each time the packaging program of the second mode is executed and the remaining warm-up operation time RT stored in the RAM A time is set (step 506), and a warm-up operation time after execution of the packaging program of the first mode is set as the remaining warm-up operation time stored in the RAM (step 508).

  When there is no request for execution of the packaging program in the first or second mode and the warm-up operation time has elapsed, the control device 60 determines “YES” in step 510 and proceeds to step 514. In step 514, the control device 60 sets the remaining warm-up operation time RT of the RAM to 0, and stops the warm-up operation of the vacuum pump 30 in step 515. After stopping the warm-up operation of the vacuum pump 30 in step 515, the control device 60 returns to step 502 again and waits until the execution of the packaging program is requested.

  When the packaging program of the second mode is not executed at all or when the remaining warm-up operation time RT stored in the RAM is 0, the packaging program of the first mode is executed (step 507). Since the remaining warm-up operation time RT is 0, the warm-up operation time is also set to 0 (step 508), and the warm-up operation of the vacuum pump 30 is substantially performed via steps 509, 510, 514 and 515. It is not controlled.

  As described above, since the warm-up operation of the vacuum pump 30 is controlled based on the execution of the second mode packaging program in which water easily mixes with the oil of the vacuum pump 30, the oil of the vacuum pump 30 is controlled. Water contained in water can be reliably removed.

  In addition, in the execution control of the warm-up operation of the above embodiment, in step 506, a constant addition time AT (for example, 2 minutes) which is added each time the packaging program of the second mode is executed is stored in the RAM The time obtained by adding the remaining warm-up operation time RT is set as the warm-up operation time, but in another embodiment, the addition time AT may be changeable in accordance with the number of times the in-bag exhaustion control is performed. . When the in-bag evacuation control is executed, the vapor released from the packaging bag is sucked from the chamber 12 to the vacuum pump 30, and the amount of water mixed in the oil of the vacuum pump 30 corresponds to the number of executions of the in-bag evacuation control. There is a proportional relationship. Therefore, if the addition time AT to be added in step 506 can be changed to be proportional to the number of times of execution of the in-bag evacuation control, the warm-up operation time according to the amount of water contained in the oil of the vacuum pump 30 It becomes possible to set to.

  Next, execution control of still another warm-up operation of the vacuum pump 30 will be described (the control for setting the executability of the airtightness detection program is the same as in the flowchart of FIG. 8, so detailed description will be omitted). The execution control program for warm-up operation of the vacuum pump 30 shown in FIG. 10 is performed after the packaging program in the second mode is executed at step 506 of the execution control program for warm-up operation of the vacuum pump 30 shown in FIG. The method of determining the warm-up operation time to be set is changed to step 605. In the execution control program for the warm-up operation of the vacuum pump 30 of FIG.

  In the warm-up operation of the vacuum pump 30, when the oil temperature of the vacuum pump 30 is low, it is difficult to remove the water contained in the oil, and when the oil temperature of the vacuum pump 30 is high, the water contained in the oil tends to be easily removed. is there. Attach a pump temperature sensor (most preferable to detect the temperature of the internal oil) to the vacuum pump 30, and in step 605, add time from the temperature (temperature of oil) of the vacuum pump 30 detected by the pump temperature sensor Set the AT or warm-up operation time. In this embodiment, if the temperature detected by the temperature sensor is lower than 50 ° C., the warm-up operation time is 5 minutes, if 50 ° C. or higher is lower than 75 ° C. 4 minutes, if 75 ° C. or higher is lower than 100 ° C. 3 minutes, 100 ° C. The above is set to 2 minutes.

  In addition, if the operating time of the vacuum pump 30 is long, the temperature of the oil of the vacuum pump 30 tends to increase, and in step 605, using the graph shown in FIG. The temperature of the oil of the vacuum pump 30 may be estimated, and the addition time AT or the warm-up operation time may be set according to the estimated temperature of the oil.

  Furthermore, the temperature of the oil of the vacuum pump 30 tends to be influenced not only by the relationship between the operation time and the stop time of the vacuum pump 30, but also by the temperature (outside temperature) of the facility where the vacuum packaging machine 10 is installed. An outside air temperature sensor for detecting the temperature of the outside air temperature is provided in the housing 11 of the vacuum packaging machine 10. In step 605, using the graph shown in FIG. 12, the operation of the vacuum pump 30 set for each outside air temperature The temperature of the oil of the vacuum pump 30 may be estimated from the time and the stop time, and the addition time AT or the warm-up operation time may be set according to the estimated oil temperature.

  In the vacuum packaging machine 10 configured as described above, when the second mode of the packaging program suitable for packaging the package at a temperature higher than normal temperature is executed, the water vapor evaporated from the package is generated. Although it is easy to mix the oil of the oil rotary vacuum pump, it is controlled to execute the warm-up operation of the vacuum pump 30 after executing the packaging program of the second mode. Even if the operator forgets to drain the vacuum pump 30, the warm-up operation of the vacuum pump 30 is surely executed after executing the packaging program of the second mode, and the oil of the vacuum pump 30 is mixed with water It was possible to prevent deterioration such as rusting of the vacuum pump 30 due to the decrease in the degassing capacity of the vacuum pump 30 and the water contained in the oil of the components of the vacuum pump 30 that sometimes occur.

  Further, in the embodiment shown in FIG. 8 of the vacuum packaging machine 10, the warm-up operation is interrupted when the execution of the packaging program of the second mode is requested again during the warm-up operation. The RAM is equipped with a counter that counts the number of times the packaging program has been executed, and the warm-up operation time of the oil rotary vacuum pump is controlled based on the number counted by the counter of the RAM. The warm-up operation of the vacuum pump 30 can be performed with a warm-up operation time of a length corresponding to the number of times of execution of the packaging program of the second mode. Also, when the packaging program of the first mode is executed during the warming-up operation, the warming-up operation is performed with the remaining warming-up operation time RT remaining before the warming-up operation is interrupted after the packaging program of the first mode is executed. Control is performed so that the oil rotary vacuum pump is warmed with a warm-up operation time of a length corresponding to the number of executions of the second mode packaging program even after the first mode packaging program is executed. It was possible to operate the machine and was able to execute the warm-up operation at an appropriate time.

  Further, in the embodiment shown in FIG. 9 of the vacuum packaging machine 10, the warm-up operation time of the vacuum pump 30 is a predetermined addition time AT to be added after executing the packaging program of the second mode, and the warm-up operation. The remaining warm-up operation time RT which had been left before the interruption when the operation was interrupted and the combined time of the RT. Also in this case, the vacuum pump 30 can be warmed up with a warm-up operation time of a length corresponding to the number of times of execution of the packaging program in the second mode, and the warm-up operation is performed in an appropriate time I was able to Further, the addition time AT may be determined based on the number of executions of the in-bag evacuation control when the packaging program of the second mode is executed. In particular, according to the number of times of execution of the packaging program in the second mode, the warm-up operation time of the length according to the number of times of execution of the number of times of in-bag evacuation control where water easily mixes with oil of the vacuum pump 30 It was possible to operate the machine and was able to execute the warm-up operation at an appropriate time.

  Further, in the embodiment shown in FIG. 10 of the vacuum packaging machine 10, the vacuum pump 30 further includes a pump temperature sensor for detecting this temperature, and an oil rotary vacuum pump based on the temperature detected by the pump temperature sensor We decided to decide the warm-up operation time. The higher the temperature of the vacuum pump 30, the easier it is to remove the mixed water. Therefore, by determining the appropriate warm-up operation time according to the temperature of the vacuum pump 30, the water contained in the oil can be removed. It was able to be removed by the appropriate warm-up operation time.

  Alternatively, the temperature of the vacuum pump 30 may be estimated based on the operation time and the stop time measured by the timer of the control device 60, and the warm-up operation time may be determined based on the estimated temperature. Also in this case, by determining the appropriate warm-up operation time according to the temperature of the vacuum pump 30, it is possible to remove the water contained in the oil in the appropriate warm-up operation time. Further, the housing 11 is further provided with an outside air temperature sensor for detecting the outside air temperature, and based on the operating time and stop time of the oil rotary vacuum pump measured by the timer and the outside air temperature sensor The temperature of the vacuum pump 30 may be estimated, and the warm-up operation time of the vacuum pump 30 may be determined based on the estimated temperature. In this way, the water contained in the oil is removed by the appropriate warm-up operation time by determining the appropriate warm-up operation time according to the temperature of the vacuum pump 30 in consideration of the influence of the outside air temperature. I was able to.

In the vacuum packaging machine 10 configured as described above, by raising the lower block body 21 to a position pressing the upper block body 22, the peripheral edge of the opening of the packaging bag is moved to the lower and upper block bodies 21. Although was held between 22, the present invention is not limited thereto, by lowering the upper block body 22 to a position to press the lower side of the block body 21, the lower the opening portion of the packaging bag It may be pinched by the side and the upper block bodies 21 and 22, or by raising the lower block body 21 and lowering the upper block body 22, the peripheral edge of the opening of the packaging bag is on the lower side and the upper side and the block body 21, 22 may be sandwiched by.

  In the vacuum packaging machine 10 configured as described above, a detection plate 43 supported in the chamber 12 on the lower surface of the chamber cover 14 so as to be rotatable about a horizontal axis is provided as expansion detection means for detecting expansion of the packaging bag. The expansion of the packaging bag is detected by detecting the magnet 44 at the rear end of the detection plate 43 which is raised by the expansion of the packaging bag by the position detection sensor 45. The present invention is not limited to this, and a detection bar formed of a rod-like member supported on the lower surface of the chamber cover 14 so as to move up and down on the upper side of the packaging bag is provided in the chamber 12. The swelling of the packaging bag may be detected by detecting a magnet provided at the end of the bar with a position detection sensor. In addition, as another swelling detection means, a light emitting unit that emits light passing through a position blocked by the expanded packaging bag above the expanded packaging bag in the chamber 12 and a light receiving unit that receives the light of the light emitting section An optical sensor may be provided, and the expansion of the packaging bag may be detected based on the detection result of the optical sensor.

 DESCRIPTION OF SYMBOLS 10 ... Vacuum packaging machine, 12 ... Chamber, 21, 22 ... Block body, 23 ... Heater, 30 ... Vacuum pump, 60 ... Control apparatus.

Claims (8)

A chamber for containing a packaging bag containing articles to be packaged;
At least one of the upper and lower sides is supported so as to be movable up and down in the chamber, and an upper and lower block body is closed by clamping the peripheral edge of the opening of the packaging bag from the upper and lower sides;
A heater provided on at least one of the upper and lower block bodies for heating and welding the peripheral edge of the opening of the packaging bag;
An oil rotary vacuum pump for degassing the chamber and producing a negative pressure;
After the gas in the packaging bag contained in the chamber is discharged by making the pressure in the chamber negative by the operation of the oil rotary vacuum pump, the peripheral edge of the opening of the packaging bag is the upper and lower block members. A first mode of packaging program suitable when the material to be packaged is at a normal temperature or less, which sandwiches and closes and seals the opening peripheral edge of the packaging bag by heating and welding by the operation of the heater;
The pressure in the chamber is reduced to negative pressure by the operation of the oil rotary vacuum pump, and the peripheral edge of the opening of the packaging bag in the negative pressure chamber is released from the closed state by moving the upper and lower blocks vertically. After executing the in-bag evacuation control for discharging the gas in the packaging bag once or more in the above state, the periphery of the opening of the packaging bag is pinched and closed by the upper and lower block bodies, and the packaging is performed by the operation of the heater. What is claimed is: 1. A vacuum packaging machine comprising: a second mode of a packaging program suitable for sealing the opening periphery of a bag by heat welding and suitable when the temperature of the package is higher than normal temperature;
A vacuum packing machine controlled to automatically execute a warm-up operation for operating the oil rotary vacuum pump after executing the packing program of the second mode. In the vacuum packaging machine according to claim 1,
There is further provided a counter unit for interrupting the warm-up operation and counting the number of times the packaging program in the second mode has been executed when requested to execute the packaging program in the second mode again during the warm-up operation. ,
A vacuum packing machine characterized in that the warm-up operation time of the warm-up operation of the oil rotary vacuum pump is controlled based on the number of times counted by the counter unit. In the vacuum packaging machine according to claim 2,
When the packaging program of the first mode is executed during the warm-up operation, the warm-up operation time remaining before the interruption of the warm-up operation after the execution of the packaging program of the first mode is the warm-up operation time A vacuum packaging machine characterized in that it is controlled to execute a machine operation. In the vacuum packaging machine according to claim 1,
When the execution of the packaging program of the second mode is requested again during the warm-up operation, the warm-up operation is interrupted and the remaining warm-up operation time remaining when interrupted is stored.
A time obtained by adding a predetermined addition time after the execution of the second packaging program to the remaining warm-up operation time is the warm-up operation time of the warm-up operation of the oil rotary vacuum pump. Vacuum packaging machine. In the vacuum packaging machine according to claim 4 ,
The vacuum packaging machine according to claim 1, wherein the addition time is determined based on the number of times of execution of the in-bag evacuation control of the packaging program of the second mode . In the vacuum packaging machine according to claim 1,
The oil rotary vacuum pump further comprises a pump temperature sensor for detecting this temperature,
A vacuum packing machine characterized in that a warm-up operation time of the oil rotary vacuum pump is determined based on a temperature detected by the pump temperature sensor. In the vacuum packaging machine according to claim 1,
It further comprises a timer for measuring the operation time and stop time of the oil rotary vacuum pump,
A vacuum packing machine characterized in that the temperature of the oil rotary vacuum pump is estimated based on the operation time and stop time measured by the timer, and the warm-up operation time is determined based on the estimated temperature. . In the vacuum packaging machine according to claim 7,
It is further equipped with an outside air temperature sensor that detects outside air temperature,
The temperature of the oil rotary vacuum pump is estimated based on the operation time and stop time of the oil rotary vacuum pump measured by the timer, and the temperature sensor for the outside air temperature, and the oil is estimated based on the estimated temperature A vacuum packing machine characterized in that the warm-up operation time of the rotary vacuum pump is determined.

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