JP2866991B2 - Gas restriction device in gas displacement packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for arranging a container filled with articles to be packaged in a pressure-resistant chamber and moving the pressure-resistant chamber on an endless track to remove air from the moving pressure-resistant chamber. The present invention relates to a rotary gas replacement and packaging machine in which an inert gas is flushed in the pressure-resistant chamber to gas-pack the object to be packaged, wherein the flushing of gas to the pressure-resistant chamber is restricted as required.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a large number of chambers (1) and (1) are rotated integrally with a rotor (2) in a direction of an arrow (3), and an empty space is formed at a position of an arrow (4). A container for packaging is placed in the open chamber (1), and after the container is filled with the object to be packaged, the chamber (1) is closed, and while the chamber makes one revolution in a circular orbit, the inside of the chamber is closed. A gas displacement packaging machine for flushing gas after evacuating the gas is provided. As another example, as shown in FIG. 8, a container for packaging is supplied at a position indicated by an arrow (7) to one rotor (6) rotating in a direction indicated by an arrow (5). While rotating with the rotor (6), after filling the container with the
The transfer mechanism (8) transfers the container into the chamber installed on the other rotor (9), and while the rotor (9) makes one rotation in the direction of the arrow (10), the container is transferred to the package inside the chamber. There has also been provided a twin-shaft gas displacement packaging machine that operates with vacuum and gas.

[0003]

However, in any of the above packaging machines, there is an uneconomical disadvantage that if no container is provided in the chamber, the gas is flushed to the empty chamber. . As yet another example, the gas is flushed even when the container supplied to the chamber is not filled with the items to be packaged. In view of the above, the present invention catches a chamber where the conditions for gas flushing are not satisfied and restricts gas flushing.

[0004]

According to the present invention, there are provided a plurality of chambers rotating at equal intervals on an endless track, a vacuum means for removing air from the chamber when the chamber reaches a predetermined position, and In a gas replacement packaging machine constituted by gas supply means for flushing an inert gas into a chamber behind the vacuum means in the direction of rotation, an on-off valve is provided in a gas supply line of the gas supply means, A timing detection switch for providing a switch in an electric circuit connected to the electromagnetic section for operating the on-off valve, connecting an output circuit of an actuator including a shift register to the switch, and further monitoring a rotation state of each chamber. And a confirmation switch for detecting an abnormality of the packaging container in front of the vacuum means, respectively, connected to the actuator via an input circuit. Are those that you configured.

[0005]

[Function] The gas displacement packaging machine transports the chamber,
The air in the chamber is eliminated by vacuum means, and a vacuum is applied to the container arranged in the chamber. On the other hand, the confirmation switch (64) transmits a signal to the actuator (42) when, for example, the container is not filled with the article to be packaged, and activates the shift register in the actuator. At the same time, the shift register starts measuring the timing in accordance with the signal transmitted from the timing detection switch (66), and when the chamber in which the container not filled with the article to be packaged reaches the gas flush position, the actuator (62) ) Sends a signal to operate the switch (61), and closes the on-off valve (53). As a result, gas flush into the chamber is prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
A pipe-shaped main shaft (23) is rotatably supported via a ball bearing (24) inside a bearing (22) fixed by the above.
The main shaft (23) is also supported around a tubular core rod (25) via a ball bearing (26), so that the main shaft (23) is located between the core rod (25) and the bearing (22). Can rotate. A large number of arms (28) radially protrude from the upper surface of the circular table-like rotor (27) fixed to the upper end of the main shaft (23) in the outer peripheral direction, and a main body (29) and a lid member (30) are respectively provided at the ends of each arm. And a chamber (31) consisting of Further, a gear (32) is fixed to a lower end of the main shaft (23), a pinion (34) supported on an intermediate shaft (33) is engaged with the gear (32), and a driving shaft (35) is The shaft (33) is engaged via a pair of worm gears (36). Therefore, the rotational power of the driving shaft (35) is transmitted to the main shaft (23) via the intermediate shaft (33), and the multiple chambers (31) are rotated integrally with the rotor (27). While the chamber makes one rotation of the circular orbit, the lid (30) is moved over the body (2
A container filled with an article to be packaged is supplied from a bag filling machine (not shown) to the opened main body (29), and then the main body (29) is opened to the main body (29) within a range of 240 degrees. For lid material
(30) is sealed. As a mechanism for opening and closing the lid member (30), for example, a mechanism for operating the link with a cam provided concentrically with the rotor to move the lid member is known, and there are various other known examples, so illustration is omitted. did.

On the other hand, in order to prevent the rotation of the core rod (25), the lower end of the core rod is fixed to the machine base with a bracket (37). Further, a disk (38) is fixed on the core rod, and a movable disk (39) is arranged on the disk, and a column member (40) erected on the upper surface of the rotor.
Is engaged with a pin (41) protruding from the side surface of the movable disk (39). Therefore, when the rotor (27) rotates, the pillar (4
(0) pushes the pin (41), which results in the movable disk (39) becoming a fixed disk
Rotate while sliding on the top surface of (38). 2 and 3
As shown in the figure, the movable disk (39) has a large number of holes (42) penetrating vertically, and each hose (43) connected to each of these holes is connected to one chamber (31), while Fixed disk on the side
(38), an S-shaped passage (44) communicating with the inside of the core rod (25) is formed, so that a hole (42) of the movable disc is formed in the passage (44).
The vacuum suction force of the vacuum pump connected to the lower end of the core rod (25) is connected to the chamber (3)
Acts within 1).

Specific examples of the means for supplying the inert gas include:
At the center of the upper surface of the fixed disk (38) as shown in FIG.
(45) is inserted to fix the rod-shaped rod valve (46), and the rod valve (46) is fixed.
Is projected upward through the center hole of the donut-shaped movable disk (39), a rotary valve (47) is rotatably provided around a rod valve (46), and the rotary valve (47) is screwed with a screw (48). It is fixed to a movable disk (39). Therefore, the movable disk (39) and the rotary valve (47) rotate integrally around the rod valve (46). Also, an L-shaped passage (49) is formed inside the rod valve (46), and a supply pipe (50) connected to a gas cylinder is connected to the upper end of the passage, while the rotary valve (47) is connected to the rotary valve (47) as shown in FIG. As many holes as chambers
(51) is formed radially, and one end of a tube (52) is connected to each hole (51). Therefore, only when the hole (51) displaced in the rotation direction around the rod valve (46) communicates with the L-shaped passage (49) opened around the rod valve, the tube (52) Gas flows inside. The tube (52) is provided with a normally open solenoid valve (53) on the way, and the other end of the tube is connected to the chamber (31) via a nozzle (54).
It is connected to. However, since the communication timing of the gas rotary valve (47) is different from the communication timing of the vacuum rotary valve (39), no gas is sucked into the chamber when sucking air in the chamber.

As shown in FIG. 1, the same number of movable electrodes (55) as the number of chambers are provided around the rotor (27), and the electromagnetic portions (56) and movable electrodes (55) of the respective solenoid on-off valves (53) are provided. And the electric wire (57)
On the other hand, and a shelf plate (5
8) A fixed electrode (59) is provided on top of the power supply circuit (6).
0), and a switch (61) is interposed in the power supply circuit. An actuator (62) equipped with a shift register on the machine base
The output circuit (63) of the actuator is connected to the switch (61), while the input circuit (65) connected to the confirmation switch (64).
Is connected to the actuator (62). Further, an encoder (66) is provided inside the machine base, and a small gear (6) provided on the rotation shaft of the encoder is provided.
7) is engaged with the gear (32) of the main shaft, and the input circuit (68) connected to the encoder is connected to the actuator (62). Therefore, the encoder (66) always reads the rotation of the main shaft (23) and transmits the data to the actuator (62). That is, in FIG. 4, a signal is read into the soft register in the actuator shown in FIG. 5 at a timing corresponding to the rotation of the chamber by the input (68) from the encoder or the timing detection switch (66) to the actuator (62). It is. The signal corresponds to the change in the rotation speed even when the rotation speed of the chamber is changed. On the other hand, the confirmation switch (64) in FIG. 4 is provided at a container supplying point or a container filling point in the bag filling machine, and monitors the bag. When the supply of the container is missing or when the container is not filled with the wrapped object, a signal is input from the confirmation switch (64) to the actuator (62) (6).
5) is done. Therefore, a stop signal (70) expressed in black is generated in the soft register as shown in FIG. 5, and the signal (70) is generated at the same timing as the rotation of the chamber by the arrow (71).
Move each frame as shown. Since the number of chambers between the installation position of the confirmation switch (64) and the gas flush position is constant, the black signal (70) reaches the specified frame, that is, an empty container that is not filled with the packaged object is provided. When the chamber reached the gas flush position, the actuator (62) in FIG.
The electromagnetic device (72) is excited by the output from the switch to close the switch (61). As a result, the on-off valve (53) is closed, and gas flush is prevented.

FIG. 6 shows an embodiment in which an on-off valve (53) is provided in a supply pipe (50) connecting a gas source (73) and a rod valve (46). According to this embodiment, the same number of solenoid valves as the number of chambers are provided. Is unnecessary. In this figure, the elements denoted by the same reference numerals as those in FIG. 1 represent the same components as those in FIG.

[0011]

According to the present invention, data obtained from a timing detection switch that monitors the rotation state of each chamber is input to an actuator, and the movement of the chamber is incorporated into a shift register provided in the actuator, and an abnormality of a packaging container is detected. Signal is sent to the soft register with the abnormal data from the confirmation switch to be performed. Therefore, even in a rotary gas replacement packaging machine in which the bag detection point and the gas flash point are separated, unnecessary gas flashing is performed. The gas flush prevention function has an economic effect of preventing wasteful consumption of gas regardless of a change in the rotation speed of the chamber.

[Brief description of the drawings]

FIG. 1 is a front view partially showing a gas displacement packaging machine in a cross section.

FIG. 2 is a plan view of a rotary valve.

FIG. 3 is a sectional view of the preceding figure.

FIG. 4 is an explanatory diagram of an electric circuit diagram.

FIG. 5 is an explanatory diagram of a soft register.

FIG. 6 is an explanatory diagram of another embodiment.

FIG. 7 is an explanatory view of a conventional example.

FIG. 8 is an explanatory view of a conventional example.

[Explanation of symbols]

 (31) ... Chamber (53) ... On-off valve (56) ... Electromagnetic part (61) ... Switch (62) ... Actuator (64) ... Confirmation switch (66) ... Timing detection switch

Claims (2)

(57) [Claims] An air inside the chamber is sucked through a rotary valve to a plurality of chambers rotating at equal intervals along an endless track and a chamber passing through a limited fixed area of the endless track. Vacuum means, and gas supply means for flushing an inert gas into the chamber via a rotary valve in a partial area behind the vacuum area in the rotation direction of the chamber, and arranged in the chamber. In a gas replacement packaging machine in which an inert gas is allowed to act on an article to be packaged in a container, an opening / closing valve 53 installed on a gas supply line connecting each chamber and a gas source and opening and closing the supply line; An electric switch 61 interposed in a power supply circuit 60 of an electromagnetic unit 56 for operating the open / close valve, and a shift register incorporated therein and an output circuit 6
3 is connected to the electric switch, a timing detection switch 66 for inputting a passage pitch of each chamber to the actuator, and an actuator which detects the presence of the container to be carried into the chamber. And a confirmation switch 64 for inputting to the timing detection switch 6.
The actuator 62 assembles the speed program of each chamber 31 based on the input signal from the actuator 6, and an abnormal input signal from the confirmation switch 64 causes the actuator 62 to reach the gas flush area. A gas limiting device in which the switch 61 is sometimes operated to close the switch valve 53. 2. A confirmation switch 64 for detecting the presence of a container carried into the chamber and inputting the same to an actuator.
2. The gas restriction device according to claim 1, wherein the presence of an article to be packaged in the container can be detected.