JPH01308720A - Vacuum packing apparatus - Google Patents

Abstract

PURPOSE:To contrive to lengthen the life of a contact point of a centrifugal switch of for an electric motor, by providing a delay circuit whereby power supply to a split-phase-start induction motor is continued for a predetermined time from a point at which the closing action of a lid is detected by a lid opening and closing detector to turn on a centrifugal switch for said motor. CONSTITUTION:Upon closing a lid 4, a pushing piece 7a of a supporting member 7 pushes a detection piece 32 to turn on a lid opening and closing detector 31, thereby closing a power supply circuit to start an electric motor. When said detector 31 is on, a delay circuit 39 comes in operation. Therefore, even if said detector 31 is on and off in a short time, the electric motor is energized for a predetermined time T from a point at which said detector 31 is on, irrespective of the turning off of said detector 31, in order to keep on a centrifugal switch 38 for the electric motor. Upon closing the lid 4 within a predetermined time T, the operation of the electric motor is continued and, therefore, the switching frequency of the centrifugal switch 38 is made lower, whereby the life of a contact point thereof can be lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a vacuum packaging device for vacuum packaging an object to be packaged, such as food, using a packaging bag made of resin film or the like.

(Prior art) A conventional vacuum packaging device is, for example, disclosed in Japanese Utility Model Application No. 62-15940.
As described in Publication No. 8, the container body and the upper opening of the container water body are sealed! It is equipped with a pressure-resistant container consisting of a lid body, a vacuum pump that makes the inside of this pressure-resistant container negative pressure, an electric motor that drives this vacuum pump, and a sealing device disposed inside the pressure-resistant container. , After placing the packaging bag containing the item to be packaged into the container body with the lid open, the lid is closed and attached (attachment process). After this attachment, the inside of the pressure-resistant container is made negative pressure with a vacuum pump and the inside of the packaging bag is closed. (degassing step), then sealing the opening of the packaging bag using a sealing device (sealing step), and then returning the inside of the pressure container to atmospheric pressure (vacuum breaking step), completing the packaging. I try to do that.

In addition, the vacuum pump described above operates based on an on/off switch that detects the opening/closing operation of the lid. For example, when the lid is open, the on/off switch is off and power is not supplied to the motor. The circuit is open, and when the lid is closed, the opening/closing switch is turned on, the power supply circuit is closed, and the electric motor is operated.

Further, in order to reliably detect the closure of the lid, the opening/closing switch is switched immediately before the lid is completely closed with respect to the container body.

(Problem to be Solved by the Invention) In the vacuum packaging 5A system as described above, the opening/closing switch is turned on when the lid is closed, and the electricity is turned on! 171 aircraft starts, but the open/close switch is turned on before the lid is completely closed, so for example, if you close the lid, listen for confirmation, then close the lid again, or turn on the open/close switch. If the lid is moved up or down in the vicinity of a switch changeover, the opening/closing switch will repeatedly turn on and off, and the electric motor will also start and stop repeatedly.

Incidentally, as a motor for a vacuum packaging apparatus, a split-phase start induction motor, which has a simple structure and is inexpensive, is generally used in many cases. This split-phase starting induction motor has a main winding and a starting winding as stator windings, and at the time of starting, power is supplied to both windings to generate a rotating magnetic flux by so-called resistance phase splitting, and a synchronous speed The start @ winding is disconnected at around 80% of the time, and pure single-phase operation continues with only the main winding during operation. A centrifugal force switch is used to disconnect the starting winding, but since a large current flows through its contact portion at the time of starting, there may be restrictions on the starting frequency.

Therefore, as mentioned above, in conventional vacuum packaging equipment,
The electric motor may start and stop repeatedly as the lid is opened and closed, which affects the life of the contact part of the centrifugal force switch of this electric motor.

The present invention has been made in view of the above-mentioned problems, and it allows the electric motor to continue to operate for a predetermined period of time even if the lid is repeatedly opened and closed in a short period of time. The purpose is to provide vacuum packaging equipment @ that can be maintained.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a pressure-resistant container for accommodating a packaging bag containing an object to be packaged, which is composed of a container body and a lid member with an opening that can be freely closed to seal the top opening of the container body. It is equipped with a vacuum pump that creates a negative pressure in the pressure container and deaerates the packaging bag, and a split-phase start induction motor that drives this vacuum pump, and is disposed inside the pressure container and removes the air from the packaging bag after degassing. A vacuum packaging apparatus equipped with a sealing device for sealing an opening includes an opening/closing detector that detects a closing operation of the lid and operates the split-phase start induction motor, and the opening/closing detector detects a closing operation of the lid. The motor is equipped with a delay circuit that causes the split-phase start induction motor to continue operating for a predetermined period of time when the closing operation of the motor is detected.

(Function) In the vacuum packaging apparatus of the present invention, the delay circuit allows the opening m detector to detect the 71-chain operation of the lid body for a predetermined period of time regardless of the detection switching of the opening/closing detector due to the opening/closing of the lid body. ,
Split-phase start The induction motor continues to be supplied with power and starts this split-phase! l
The centrifugal force switch of the I-induction motor continues to be on, and the lid is closed within the predetermined time period.
If the opening/closing detector detects the opening/closing detector, operation of the split-phase start induction lightning machine A continues as it is.

(Example) Hereinafter, the configuration of an example of the present invention will be described with reference to the drawings.

1 and 2, a pressure-resistant container 2 is provided at the top of a casing 1 of the vacuum packaging apparatus, and this pressure-resistant container Pii2 includes a box-shaped container body 3 that opens upward, and a container body 3 that is opened upward. It consists of a lid 4 that can be freely opened and closed with a top opening tightly sealed r51, and a vacuum chamber 5 is formed by the container body 3 and the lid 4. The lid body 4 is constructed by fitting and fixing a support member 7 attached to the rear part of the lid body 4 to a support shaft 6 rotatably installed at the rear part of the container main body 3, so that the lid body 4 can be rotated around the support shaft 6 at the jil 111. It can be opened freely by a spring 10 stretched between the lower end of a lever 9 that is integrally fixed to the support shaft 6 via a connecting member 8 and the front lower surface of the container body 3. The opening and closing balance is maintained by pushing one force toward the other.

Further, a sealing device 1 is provided on the front side of the vacuum chamber 5 of the pressure-resistant container 2.
1 is provided, and this enclosure is provided with a heat ray receiver 12 on the lid body, and a fulcrum 13 rotatably supported on the inner wall of the container body 3. The heater block 15 is supported vertically by a support rod 14 that swings around VJ, and the airbag 16 is inflated by introducing air into the 1st Abbot 1G provided in the peak block 15 through the pipe 17. Push up the heater block 15 with R / υ and press the heat !! 218 on the top surface of the heater block 15 against the heat ray receiver 12. Note that the air bag 16 [Y], with the vacuum chamber 5 evacuated, connect the piping 17. When it is opened to the atmosphere (), air enters and expands.

In addition, inside the housing 1, a split-phase starting induction motor is equipped with 21
and a vacuum pump 22 driven by this electric + j + odor 21
An inlet 23 of the vacuum pump 22 is connected to an inlet 25 opening at the bottom of the container body 3 via a vibrator 24 .

On the other hand, at J in FIG.
, the detection piece 32 of the opening/closing detector 31 is not pressed and is in the OFF state between the Δ position in the open state of the lid body 4 and the 8 position immediately before it is closed by the container body 3, and the lid body 4 is in the OFF state.
Between the above-mentioned position B and the position C where the container body 3 is completely closed, the detection piece 32 is pressed by the pressing piece 7a of the support member 7 and switched to the on state.

Further, FIG. 3 shows a power supply circuit to the split-phase starting rust conduction motor 21, and the main winding 36 of the '#i motor 21 and the starting winding 37 are connected to the power supply 35 via the switching detector 31. and centrifugal force switch 38 are connected in parallel.

Further, a delay circuit 39 is connected between the power supply 35 and the open/close detector 31 and the electric motor 21, and this delay circuit 39
As shown in FIG. 4, the configuration is such that power is supplied to the electric motor 21 regardless of whether the opening/closing detector 31 is turned off for a predetermined time T from the time when the opening/closing detector 31 is once turned on, that is, the centrifugal force switch 38 of the electric motor 21 is in the on state. It is configured to continue.

In addition, in the figure, 40 indicates the rotor of the electric hoist 21.

Then, in performing vacuum packaging, first, a packaging bag 42 made of a heat-fusible material such as a polyethylene resin film and containing an object 41 to be packaged, such as food, is placed inside the container body with the lid 4 open. 3, place the opening 43 of the packaging bag 42 on the hot wire 18 of the sealing device 11, and then fold down the lid 4 to close the opening of the container body 3.

When the lid 4 is closed, the suppressing piece 7a of the support member 7 presses the detecting piece 32, turning on the open/close detector 31, opening the power supply circuit, and starting the electric motor 21. 22 is operated, the inside of the vacuum chamber 5 is made negative pressure, and the inside of the packaging bag 42 is degassed.

After the above-mentioned deaeration is completed, air is sent into the air bag 1G of the sealing device 11 and the heater block 15 is pushed up, so that the hot wire 18 is pushed onto the hot wire receiver 12 with the frontage 43 of the packaging bag 42 in between. At the same time, the hot wire 18 is energized, and the opening 43 of the packaging bag 42 is heated and welded to i=1.

After the sealing is completed, the atmosphere is introduced into the vacuum chamber 5 and the pressure is increased to atmospheric pressure. Then, the lid 4 is opened and the packaging bag 42 containing the object to be packaged 41 is taken out to complete the packaging operation.

In addition, the above phone! 1] When machine 21 starts, both volumes I! 13
G.

371: Power is supplied to generate a rotating magnetic field by so-called resistance phase separation, and the centrifugal force switch 38 disconnects the starting winding 37 at around 80% of the synchronous speed, and during operation, pure medium-phase operation is performed using only the main winding 36. Continue.

By the way, when the opening/closing detector 31 is turned on, the delay circuit 39 is activated. Therefore, for example, when the lid 4 is closed and then opened to check the packaged object 41, or when the switch of the opening/closing detector 31 is changed, the lid 4 closes to the position 8 in FIG. Even if the opening/opening detector 31 is turned on and then turned off for a short period of time, such as when moving the fourth
As shown in the figure, open/close detection P! 31 is once turned on, the predetermined time T is regardless of whether the opening/closing detection 11i31 is turned off.
Electric! 7] Since the centrifugal force switch 38 of the motor 21 is kept on by supplying power to the motor 21, the predetermined time 1
If the lid body 4 is closed within
The operation of the centrifugal force switch 38 continues, therefore, the frequency of switching the centrifugal force switch 38 is reduced, and the life of the contact portion of the centrifugal horn switch 38 can be maintained.

Note that when the opening/closing detector 31 is turned on and off again within a predetermined time T after being turned on and off by -.degrees, a predetermined time T is set from the time when the 911M detector 31 is turned on again.

In addition, even if the predetermined period of time has elapsed, 111 detection 1531
If not turned on, power supply to the electric power I17]v421 is stopped and the centrifugal force switch 38 is turned off.

〔Effect of the invention〕

According to the present invention, for a predetermined period of time from the point in time when the opening/closing detector once detects the spinning of the 11-strand chain by the delay circuit, the opening/closing detector
Regardless of the detector, in order to continue supplying power to the split-phase start YK conduction motor and keep the centrifugal force switch included in this split-phase start induction motor in the on state, if the lid is closed within the predetermined time, the The operation of the split-phase start induction motor can be continued, the frequency of switching of the centrifugal force switch provided in the split-phase start induction motor IJI 41 can be reduced, and the life of the contact portion of the centrifugal force switch can be maintained.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the vacuum packaging bag a of the present invention.III
FIG. 2 is a sectional view of the - section, FIG. 3 is a circuit diagram, and FIG. 4 is a time chart. 2. Pressure-resistant container, 3. Container body, 4. Lid, 11.
- Sealing device, 21... Split-phase start induction motor, 22... Vacuum pump, 31... rM open/close detector 39... Delay circuit,
41...Object to be packaged, 42...Packaging bag.

Claims (1)

[Claims] (1) A pressure-resistant container that houses a packaging bag containing a packaged item, which is made up of a container body and a lid that can be opened and closed to seal the top opening of the container body; Vacuum packaging comprising a vacuum pump that performs deaeration, a split-phase start induction motor that drives the vacuum pump, and a sealing device that is disposed within the pressure-resistant container and seals the opening of the packaging bag after deaeration. The device includes an opening/closing detector that detects the closing operation of the lid body and operates the split-phase starting induction motor, and when the opening/closing detector detects the closing operation of the lid body, the split-phase starting induction motor operates for a predetermined period of time. A vacuum packaging device characterized by being equipped with a delay circuit for continuously operating an electric motor.