JP2566705Y2 - Automatic two-pack detection device for automatic packaging machines - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the presence or absence of two pieces of a grasped bag when opening a bag opening before filling a filling material in an automatic packaging machine.

[0002]

2. Description of the Related Art As shown in FIG. 3, a basic packaging system of an automatic packaging machine for foods or the like supplies a bag 1 in a bag storage device to a bag feeding apparatus A.
A bag feeding step (I) in which the food is sucked and lifted by the suction cup 3 and transferred to the chucks 2 and 2 of the gripping device B on the table T side by the gripping means 27, and the production date of the food is placed on the surface of the gripped bag 1. A stamping step (II) for stamping, a bag opening step (III) in which the mouth of the bag 1 is opened by the suction cup 4 of the bag opening device D, and the bag 1
A filling step (IV) of filling a filling material and a filling liquid therein;
(V), a primary sealing step (VI), a secondary sealing step (VII), in which the bag mouth is sealed by the sealing device F, and the completed bag 1 is transferred to the next step, for example, a vacuum packaging machine, or externally. And a discharge step (VIII) for discharging to

In the bag opening step (III) of the above packaging system, as shown in FIG. In the case where the bag bottom is double-folded like a self-standing bag, a suction cup for the main body (lower part) is provided separately from the suction cup 4 for the bag mouth, and the bag mouth and the main body are simultaneously set with two sets of suction cups. It is designed to open and widen. FIGS. 4A and 4B show a normal bag opening operation procedure.

[0004]

When the bag 1 in the storage device is sucked and supplied by the suction cup 3 in the bag supply step (I),
The bags 1 are sucked one by one from the upper side, gripped by the gripping means 27, and delivered to the chuck 2 of the gripping device B on the table T side. 1a and 1b may be simultaneously sucked by the suction cup 3 and delivered to the chuck 2.

FIG. 5 shows the opening operation when two bags 1a and 1b are taken out in this manner. As shown in FIG. 5 (a), two bags 1a and 1b are held by chucks 2 and 2 as shown in FIG. Is sent to the bag opening step (III), and as shown in FIG.
To drive the upper suction cups 4a and 4b into the bag mouth (upper part) of the bag 1.
And the drive rods 12 and 13 are driven to bring the lower suction cups 5a and 5b into contact with the main body (lower part) of the bag 1. When the left and right sides are expanded, the two bags 1a and 1b are separately pulled to the left and right, respectively, as shown in FIG.

In this state, the bags 1a and 1b are placed in the filling step (I
V) and (V), and a fixed amount of the filling (liquid) is introduced as shown in FIG. 6, where the filling (liquid) is supplied from between the two opened bags 1a and 1b. The inconvenience of being thrown on the floor or hitting the rim of the bag and scattering to the surroundings occurs. However, conventionally, there is no method or means for detecting whether or not two bags held by the chuck have been taken, and the present situation relies on visual observation.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and a feature of the present invention is that a bag mouth and a body of a bag gripped by a gripping device are respectively vacuum-adsorbed by a pair of suction cups. In the bag-opening device for expanding the opening and the main body, a sensor for detecting the presence or absence of a negative pressure acting at the expanded position of the suction cup for expanding the main body side, and two bags based on the detection signal of the sensor. It is configured to include a control device that determines the presence / absence of taking and controls various operations thereafter.

[0008]

[Function] The bag has a sensor that detects the presence or absence of negative pressure acting on the suction cup that expands the bag body (lower part), and a control device that receives the detection signal and outputs an output signal. Detects the negative pressure acting on the main body suction cup during operation,
The detection signal is sent to the controller to determine whether or not two bags are taken. If it is determined that two bags are taken, the subsequent operations, that is, the filling (liquid) of the bag are performed on the bag. The charging operation, the sealing operation, and the like are stopped, and the two bags are sent to the discharging process and discharged to the outside.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a configuration of a bag opening apparatus to which the present invention is applied. As shown in the figure, the bag opening device D is a bag opening (upper part) of the bag 1.
And a pair of suction cups 5a and 5b for expanding the main body (lower part) of the bag 1 are provided. The upper suction cups 4a and 4b are respectively connected to a base 16a installed above the base column 16 and shafts 10 and 2 via vacuum pipes 4c and 4d.
5 are connected to links 7 and 9 which are rotatably supported by a shaft. The links 7 and 9 are connected to each other via a connecting link 8, and the other end of the link 7 is connected to a driving rod 11. I have.

On the other hand, the suction cups 5a, 5b on the main body side are connected to moving plates 12a, 13a which are moved by driving rods 12, 13 via vacuum pipes 5c, 5d, respectively. or,
Vacuum pipe 4 connected to suckers 4a, 4b on the bag mouth side
The vacuum pipes c and 4d are connected to suction pipes 5a and 5b on the main body side through vacuum hoses 14a and 14b.
c and 5d are vacuum hoses 15a and 15b and vacuum circuit 20
Through a vacuum pump 18. And
A circuit pressure detecting sensor 19b is provided in a vacuum pressure circuit 20 connecting the suction cups 5a, 5b on the main body side and the vacuum pump 18, and a detection signal from the sensor 19b is sent to a control device 22. I have. A control device 22 is provided between the same sensor of the vacuum circuit and the vacuum pump.
, The vacuum circuit 20 is opened in accordance with the timing of the expanding operation of the suction cup, and the others are closed.
3b is installed.

4 (a) to 4 (d) illustrate a normal bag opening operation procedure (ie, one bag) by this apparatus. One sheet held by the chucks 2 and 2 on the table T side will be described. Is sent to the bag opening step (III) and enters the upper and lower suction cups 4a, 4b and 5a, 5b which have been opened beforehand (a
FIG.), The electromagnetic switching valves 23a, 23
3b is opened and a vacuum action is applied to each suction cup via the vacuum circuits 20, 21 and the like (FIG. 1). Next, the drive rod 11 is moved downward,
The drive rods 12, 13 are moved in the closing direction to bring the suction cups 4a, 4b into contact with the bag mouth (upper) of the bag 1, and the suction cups 5a, 5b into contact with the main body (lower) of the bag 1, respectively (FIG. 2b). after the adsorbed onto the bag 1, when driving each drive rod 11, 12, 13 move each suction cup to the left and right, the bag 1 is a whole are opened and widened from O dimensions to S ₁ dimensions (c view ).

Then, the rod 6 is inserted into the bag opening to adjust the state of the opening (in some cases, air is blown into the bag to promote the expansion), and the rod 6 is pulled out from the bag opening. By the way, sucker 5
The expanding operation of a and 5b is performed based on the dimension O in FIG.
Is performed until S ₂ dimensions in figure, air enters into the vacuum circuit 20 sucker because there is no growth potential in the bag 1 at a position which is widened in S ₁ is disengaged from the bag, the vacuum circuit pressure and the atmospheric pressure Become. That sends a signal of the sensor 19b that was successfully the circuit pressure acting on the sucker position between S ₁ to S ₂ is atmospheric pressure to the controller 22, the input device E from the next step, a mouth sealing sealing device F Normal operation (FIG. 1).

However, two bags 1a and 1b, which are closely attached or entangled, are supplied from the bag supply device A,
Even when two sheets 2 are taken out, the opening and expanding operations are performed on the bag 1 sent in the bag opening step (III) in the procedure shown in FIG. Then, as shown in FIG.
a, 4b and 5a, two bags 1a by 5b, 1b is pulled away to the left and right separately, when fully pulled away until _{S 2} dimensions as (d) diagrams, the bag mouth (upper) opening sucker 4a, 4b
Is the bag 1 because the upper part of the bag mouth is short from the gripping parts of the chucks 2 and 2.
, And the circuit pressure of the vacuum circuit 21 becomes atmospheric pressure.
However, the suction cup 5 of the main body (lower part) adsorbing the lower part of the bag
In FIGS. 5A and 5B, the bags 1a and 1b are freely deformed, so that the bag body is still attracted even at the position shown in FIG. That is, the circuit 20 communicating with the suction cups 5a and 5b is still at a vacuum pressure (negative pressure). Therefore sucker 5a, a case 5b is between spreading operation S ₁ to S ₂ of a negative pressure detected by the sensor 19b, determines the collected two sends a detection signal of the sensor to the controller 22, the next step The operation of the charging device E, the mouth sealing device F, and the like is stopped, and the bag is discharged out of the machine with the empty bag.
The position detection of the expanding operation is a synchronization signal by the timing cam of the packaging machine.

[0014] Figure 2 shows a flow chart of detecting operation preparative two, the first bag opening step (III) based on the bag mouth opening command At a bag mouth is opened from O to S _1, a vacuum circuit the existence of negative pressure 21 is the bag mouth normally if the detected negative pressure in the sensor 19a is determined to have been opened, followed by the suction cup is S ₁ to S ₂ spreading vacuum circuit by the sensor 19b 20
If the detection signal is the atmospheric pressure, that is, it is determined that one sheet has been normally taken without taking two sheets, and the filling material and the filling liquid are charged according to a normal procedure, and the bag is filled. The mouth is sealed and discharged. Contrary to this, sucker 5
a, 5b is S ₁ to S ₂ is expanded to the sensor 19b is determined to when the negative pressure in the vacuum circuit 20 is detected is taken bags two, subsequent operation ie filling step (IV), ( V)
The filling operation and the filling operation, the detecting operation and the sealing operation in the sealing steps (VI) and (VII) are all stopped, and the two bag openings gripped by the chucks 2 and 2 are stopped. 1a and 1b are directly sent to the discharge step (VIII) and then discharged to the outside, thereby preventing contamination, scattering, erroneous sealing, and the like caused by erroneous charging of the filling material or the filling liquid as in the related art. Become.

[0015]

As described above, according to the two-bag detection device of the present invention, the sensor detects the negative pressure acting on the suction cup that expands the lower part of the bag body, and sends the detection signal to the control device. It is possible to determine whether or not two bags have been taken, and if it is determined that two bags have been taken, stop all subsequent operations, that is, filling and sealing operations, and discharge the bags as they are. Since it is sent to the process and discharged
There is an excellent effect that the erroneous injection of the filling material or the filling liquid into the two-sheet bag and the erroneous sealing as in the related art are prevented, and the filling material (liquid) and the bag are not wasted, or there is no contamination or scattering. .

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a bag opening apparatus to which a bag detection device according to the present invention is applied.

FIG. 2 is a flowchart showing the operation of the above device.

FIG. 3 is a diagram showing an outline of a packaging system to which the above device is applied.

FIGS. 4A to 4D are diagrams showing a normal bag opening operation procedure.

FIGS. 5A to 5D are diagrams showing a bag opening operation procedure when two bags are taken.

FIG. 6 is a view showing a state of filling according to a conventional two-bag picking.

[Explanation of symbols]

 1, 1a, 1b Bag 2 Chuck 4a, 4b Upper suction cup 5a, 5b Lower suction cup 19 Negative pressure detection sensor 22 Control device 23a, 23b Electromagnetic switching valve 27 Gripping means D Bag opening device E Filling device F Sealing device

Claims (1)

(57) [Scope of request for utility model registration] 1. A bag opening device for opening a main body in a bag opening device in which a bag mouth and a main body of a bag gripped by a gripping device are respectively vacuum-adsorbed by a pair of suction cups to open the main body and open the main body. It is equipped with a sensor that detects the presence or absence of a negative pressure that acts at the open position, and a control device that determines the presence or absence of two-bag picking based on the detection signal of the sensor and controls various operations thereafter. Detecting device for two bags of automatic packaging machine.