JP2000142603A - Filling apparatus of packing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a filling apparatus wherein even if a substance to be filled is relatively highly viscous, measuring accuracy of a measuring cylinder does not drop nor productivity drops. SOLUTION: The filling apparatus comprises a reservoir tank 1 for a substance to be filled, two measuring cylinders 21, 22 placed on a downstream of the tank 1 for repeating suction and discharge, and two measurement paths 23a to 23b and 24a to 24b for respectively connecting the reservoir tank 1 with each of the measuring cylinders 21, 22, wherein three-way switch valves 23, 24 are respectively placed on each of the measurement paths, and discharge ports of the respective switch valves are combined to be a discharge path 23c, which is connected via a filling channel 29 to a filling nozzle. An amount of the substance which has been measured by each of the measuring cylinders 21, 22 is specified to correspond to an amount to be filled in one empty container, the respective cylinders 21, 22 alternately discharge the substance, and further, substance suction time in each of the cylinders 21, 22 is set to be longer than discharging time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filling device for an empty container which is intermittently transferred sequentially in a packaging machine while the container is stopped in a filling step provided in a transfer path. TECHNICAL FIELD The present invention relates to a filling device for filling a filling material having a relatively high viscosity.

[0002]

2. Description of the Related Art An example of such a filling device is shown in FIGS. This filling device comprises a measuring section A and a filling nozzle B. The measuring section A includes a storage tank 1 for liquid filling, a measuring cylinder 2 installed downstream of the storage tank 1 to repeat suction and discharge, and a storage tank. 1 and a metering cylinder 2 are provided. The valve member 3 includes a three-way switching valve 3a, ports (measuring paths 3b and 3c) connecting the storage tank 1 and the measuring cylinder 2, and a discharge port. An outlet port (discharge path 3d) is provided. In this measuring section A, a piston rod 4 driven by a driving means (not shown) moves up and down in the measuring cylinder 2, and as shown in FIG.
When the piston rod 4 descends in a state where b and 3c communicate with each other, a predetermined amount of the filler in the storage tank 1 is sucked into the measuring cylinder 2, and the measuring path 3c and the discharge path 3d communicate as shown in FIG. When the piston rod 4 rises in this state, the filling in the measuring cylinder 2 is discharged.

The filling nozzle B has a cylindrical filling nozzle holder 5 having a filling channel opening 5a formed on the side surface thereof, a cylindrical filling nozzle 6 having a discharge port 6a at the tip and a filling channel passage hole 6b formed on the side surface. A filling nozzle body 6 which is formed and slides up and down by sliding in the filling nozzle holder 5, and slides up and down by sliding in the filling nozzle body 6 to open and close the channel hole 6 b of the filling nozzle body 6. And a flow path opening / closing valve 7 having an air outlet 7a at the end. The filling nozzle holder 5 is fixed to the support stand 8, and the filling nozzle main body 6 is moved up and down by the operation of the air cylinder 9 installed on the support stand 8, and at the lower end thereof, the flow path hole 6 b flows through the filling nozzle holder 5. The discharge port 6a overlaps with the passage opening 5a and is inserted into the bag opening of the empty bag W in which the discharge port 6a is stopped downward (see FIG. 7).
And the discharge port 6a is pulled out from the bag mouth (see FIG. 8). The flow path opening / closing valve 7 is moved up and down together with the filling nozzle body 6 by the operation of the air cylinder 9, and is moved up and down with respect to the filling nozzle body 6 by the air cylinder 10. A hole 6b is opened to communicate with the discharge port 6a, and an air outlet 7a at the tip is projected from the discharge port 6a at the lower end, and air is blown out from the discharge port 6a. Note that 11
Is a pressure air introduction path, 12 is an O-ring, and 13 is, for example, a bag holding chuck of an intermittent rotary table type packaging machine. Further, the discharge path 3d of the valve member 3 of the measuring section A and the flow path opening 5a of the filling nozzle holder 5 of the filling nozzle B are connected by a filling flow path 14 using a flexible hose.

[0004] The operation of the filling device of the packaging machine having such a configuration will be specifically described with reference to the operation timing charts (conventional example) of Figs. FIG. 5 shows an example in which empty containers are transferred to the filling step at one-second intervals, stopped for one second, and then transferred to the next step. In other words, the capacity of the filling device is 30 cycles per minute with one cycle of 2 seconds. It shows. First, as shown in FIG. 8, while the empty bag W is transferred to the filling step, in the measuring section A, the piston rod 4 descends to suck the filling material into the measuring cylinder 2, and when the suction ends, the switching valve is switched. 3a is switched immediately. On the other hand, in the filling nozzle B, the filling nozzle body 6 is
And the flow path opening 5a of the filling nozzle holder 5 is closed, and the flow path opening / closing valve 7 is also
0, which is in the ascending position,
b and the discharge port 6a communicate with each other.

When the empty bag W stops in the filling step, the measuring section A
7, the piston rod 4 moves upward to discharge the filling in the measuring cylinder 2 as shown in FIG. Almost at the same time, in the filling nozzle B, the filling nozzle body 6 is lowered by the air cylinder 9, the discharge port 6a is inserted into the bag mouth of the empty bag W, and the flow path hole 6b is connected to the filling nozzle holder 5
The filling material in the measuring cylinder 2 is filled through the discharge path 3d, the filling flow path 14, the flow path opening 5a of the filling nozzle holder 5, the flow path hole 6b of the filling nozzle body 6, and the discharge port 6a. The object is filled in the empty bag W. When the discharge of the measuring cylinder 2 is completed, the switching valve 3a is immediately switched, while the flow path opening / closing valve 7 is lowered by the action of the air cylinder 10, and the air outlet 7a at the tip projects from the discharge port 6a. Air is blown out of the bag 6A to blow off the filler adhering to the discharge port 6a into the bag W. Subsequently, the filling nozzle body 6 is immediately raised by the air cylinder 9, and at the same time, the flow path opening / closing valve 7 is raised by the air cylinder 10 in the filling nozzle 6, and returns to the position shown in FIG.

[0006]

When filling a relatively high-viscosity filler with such a filling device, a longer time is required for suctioning the filler by the measuring cylinder than for a low-viscosity filler. Becomes This is because the flow resistance increases as the viscosity of the filler increases, so if the suction time is short (the suction speed is high), a predetermined amount of the filler cannot be sucked into the weighing cylinder at the time of suction, and the weighing accuracy is extremely high. This is because a problem of lowering occurs. On the other hand, the measuring cylinder needs to discharge the filling while the transfer of the empty container is stopped, and to suck the filling while the empty container is being transferred. For example, the operation timing shown in FIG. Then, the time available for discharge or suction of the measuring cylinder is only 0.8 seconds excluding the switching time of the switching valve. That is, in order to operate the filling device at the operation timing shown in FIG. 5, the filling material must have a viscosity such that suction can be completed accurately within 0.8 seconds.

[0007] Therefore, if the filling material has a higher viscosity and takes a longer time to suction, the operation speed of 30 times / min cannot be maintained, and the entire packaging machine including the transfer device and the filling device is not provided. It is necessary to reduce the capacity and increase the suction time, which significantly reduces the productivity. As one means for solving this, a method of shortening the discharge time and lengthening the suction time accordingly (starting suction while stopping) can be considered. However, if the discharge time is shortened, the filling may not be completed in time, the load on the driving means of the piston rod of the measuring cylinder may be increased, or the flow rate may become too large and the filling may be scattered out of the bag. .

Another problem with the above filling apparatus is that, at the time of discharging the filler, some factors (for example, insufficient discharge time, increase in the filling amount, change to a filler having a higher viscosity) in the flow path. When the pressure increases, an extremely large load is applied to the driving means for operating the measuring cylinder, and the driving means is damaged, which may adversely affect productivity. Therefore, a material such as a flexible hose whose inner diameter is slightly expanded by pressure, such as a flexible hose, is used for the filling flow path from the switching valve to the filling nozzle, but the volume in the flow path due to expansion is very small. Was not enough to avoid the problem. Further, as another problem in the above-mentioned filling device, since the ascending and descending of the filling nozzle main body is driven using an air cylinder, the air cylinder does not operate for some reason during the operation of the filling device, and the filling nozzle main body is at the lower end. When the apparatus stops, the apparatus such as the bag and the gripper comes into contact with the filling nozzle body, and there is a problem that the filling nozzle body and other apparatuses are damaged.

The present invention has been made in view of the above problems. First, even if the filling material has a relatively high viscosity, the measuring accuracy by the measuring cylinder is not lowered and the productivity is lowered. It is an object of the present invention to obtain a filling apparatus that does not cause the filling. Also, it is possible to obtain a filling device in which the driving means of the weighing cylinder is not damaged even when the pressure in the flow path is increased at the time of discharging the filling material, or the filling nozzle main body is lowered during the operation of the packaging machine. Another object of the present invention is to obtain a filling device that does not break the filling nozzle body and the transfer device.

[0010]

According to the present invention, there is provided a storage tank for a filling material, two measuring cylinders which are provided downstream of the storage tank and repeat suction and discharge, and connect the storage tank and each measuring cylinder respectively. Filling of a packaging machine provided with two measuring paths, each having a three-way switching valve disposed in each measuring path, and a discharge port of each switching valve or a downstream side thereof merging and connected to a filling nozzle as one filling flow path. In the apparatus, the amount of the filling material measured by each measuring cylinder is set so as to correspond to the filling amount for one empty container, and each measuring cylinder alternately discharges the filling material. It is characterized in that the filling material suction time is set longer than the discharge time.

In the above-mentioned filling device, the length of the filling channel can be expanded and contracted in accordance with the internal pressure. In the filling device, the filling nozzle can be configured as follows. That is, a fixed filling nozzle holder having a cylindrical shape and a filling channel opening formed on the side surface, and a filling material passage hole formed on the side surface with a discharge end having a cylindrical tip and a filling nozzle holder. A filling nozzle body that slides up and down, and a passage opening / closing valve that slides up and down in the filling nozzle body to open and close a flow passage hole of the filling nozzle body and has an air outlet at a tip thereof; The filling nozzle body is moved up and down by a mechanical cam interlocking with the packaging machine body, and at its lower end, the passage hole overlaps with the passage opening of the filling nozzle holder, and at the rising end, the passage hole coincides with the passage opening of the filling nozzle holder. The position is completely shifted, the flow path opening / closing valve is moved up and down together with the filling nozzle body by the mechanical cam, and is moved up and down with respect to the filling nozzle body by a multi-position cylinder. In this configuration, the flow path hole of the filling nozzle main body is opened to communicate with the discharge port, the flow path hole of the filling nozzle main body is closed at the intermediate position, and the air outlet at the tip is projected from the discharge port at the lower end. .

It should be noted that the length of the filling channel can be expanded and contracted in accordance with the internal pressure, and the configuration of the filling nozzle is not limited to the filling device. 1. Filling device having one or more measuring cylinders in general (a storage tank for filling material, a measuring cylinder that is installed downstream of the storage tank and repeats suction and discharge, and a measuring path that connects the storage tank and the measuring cylinder. It is needless to say that the present invention can be applied to a filling device in which a three-way switching valve is arranged in the measurement path and a filling flow path connecting the discharge port of the switching valve and the filling nozzle is provided.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a filling device of a packaging machine according to the present invention will be specifically described with reference to FIGS. 1 to 6 (the same parts as those in the conventional example are denoted by the same reference numerals). FIG. 1 shows a measuring section A of the filling device according to the present invention. The measuring section A includes a storage tank 1 for the liquid filling material, and measuring cylinders 21 and 22 that are provided downstream of the storage tank 1 and repeat suction and discharge.
It has a valve member 20 installed between the storage tank 1 and the measuring cylinders 21, 22, the valve member 20 comprising two three-way switching valves 23, 24, and for each switching valve 23, 24 the storage tank 1. One discharge path 2 in which ports (metering paths 23a, 23b, 24a, 24b) connected to the measuring cylinders 21 and 22 and a port serving as a discharge port are merged and integrated.
3c. In the measuring section A, piston rods 25 and 26 driven by driving means (not shown) move up and down in the measuring cylinders 21 and 22 to suck or discharge the filling material. In FIG. 1, the measurement path 24 of the switching valve 24
The piston rod 26 descends in a state where the a and 24b communicate with each other, sucks the filling in the storage tank 1 into the measuring cylinder 22, and the measuring path 23b and the discharge path 23c of the switching valve 23.
The state in which the piston rod 25 rises in a state where the fluid is communicated and discharges the filling in the measuring cylinder 21 is shown.

In the measuring section A, each measuring cylinder 2
The amounts of the fillings measured at 1 and 22 are set so as to correspond to the filling amounts for one empty bag, and the measuring cylinders 21 and 22 discharge the fillings alternately. Therefore, after the filling material is discharged by one of the measuring cylinders to fill the empty bag, the next empty bag to be transferred is filled by discharging the other measuring cylinder. That is, in this measuring section A, suction and discharge of one measuring cylinder (21 or 22) are performed in two cycles of bag transfer (two bags).
Once a time, the time for two cycles is allocated to suction and discharge (take longer suction time)
be able to. For example, as shown in the operation timing table of each measuring cylinder (piston rod) shown in FIG.
When operating in a cycle, the suction time can be 2.8 seconds, assuming a conventional discharge time of 0.8 seconds.

2 and 3 show a filling nozzle B of the filling device according to the present invention. The filling nozzle holder 5, the filling nozzle main body 6, the flow path opening / closing valve 7 and the like constituting the filling nozzle B have the same structure as the conventional example, but the filling nozzle main body 6 and the flow path opening / closing valve 7 are provided in the packaging machine main body (bag transfer). The apparatus is driven up and down by being driven by a mechanical cam 27 interlocked with the apparatus, etc., and is further moved up and down by being driven by a multi-position cylinder (stopped at upper, lower and intermediate positions) 28. I have. Further, the discharge path 23c of the switching valves 23 and 24 of the measuring section A and the flow path opening 5a of the filling nozzle holder 5 of the filling nozzle B are connected by a filling flow path 29 formed of a metal hose, and the side of the discharge path 23c. Then hose and discharge path 2
An O-ring 31 is attached between the discharge mouthpieces 3c, so that the hose and the discharge mouthpiece 30 can slide in the length direction while maintaining watertightness. The entire weighing section A is elastically movable as shown by the solid line and the imaginary line in FIG.

An example of the movement of the filling nozzle B is shown in FIG.
A description will be given below along (a) to (e) and with reference to the operation timing table of FIG. (A) While the empty bag W is being transferred to the filling step, on the side of the filling nozzle B, the filling nozzle main body 6 is at the upper end by the mechanical cam 27 (see FIG. 3), and the flow path opening / closing valve 7 is multi-positioned. It is at an intermediate position by the shaped cylinder 28 and closes the flow passage hole 6b of the filling nozzle body 6. During this time, in the measuring section A, for example, the measuring cylinder 21 continues to suck, while the measuring cylinder 22 stops sucking, and the switching valve 24 is immediately switched to the discharge side. (B) When the empty bag W stops in the filling step, the filling nozzle body 6 is lowered by the mechanical cam 27 and enters the empty bag W. At this time, the passage hole 6b of the filling nozzle main body 6 overlaps the passage opening 5a of the filling nozzle holder 5. (C) The flow path opening / closing valve 7 is immediately moved to the multi-position cylinder 28.
To the upper end position, the flow path hole 6b of the filling nozzle body 6
Is opened to communicate with the discharge port 6a (see FIG. 2). On the other hand, in the measuring section A, the measuring cylinder 22 starts discharging, and the filling material fills the empty bag W through the discharging path 23c, the filling flow path 29, the flow path opening 5a, the flow path hole 6b, and the discharging port 6a. Is done. During this time, the measuring cylinder 21 continues to suck.

(D) When the discharge of the measuring cylinder 22 is completed, the flow path opening / closing valve 7 is brought to the lower end position by the multi-position cylinder 28, thereby closing the flow path hole 6b of the filling nozzle body 6 and simultaneously blowing air. The opening 7a is made to protrude from the discharge port 6a, and the attached filler is blown off into the bag by blowing air. On the other hand, in the measuring section A, the switching valve 24 is switched to the suction side immediately after the discharge of the measuring cylinder 22 is completed. During this time, the measuring cylinder 21 continues to suck. (E) Subsequently, the filling nozzle body 6 is lifted up by the mechanical cam 27 and pulled out of the bag W, the filled bag W is transferred to the next step, and a new empty bag W is transferred to this filling step. During this time, the flow path opening / closing valve 7 is
As a result, in the filling nozzle body 6, the lowering position is raised from the lower end position to the intermediate position. In the measuring section A, the measuring cylinder 22 continues to suction, while the measuring cylinder 21 stops sucking, and the switching valve 23 immediately switches to the discharge side. And the movements of (a) to (e) are repeated again.

As described above, in the filling device of the present invention, two measuring cylinders capable of measuring one bag are installed, and the filling material is alternately discharged, so that two cycles of time are taken for suction. It can be assigned to discharge. For this reason, the suction time can be set longer than the discharge time without shortening the discharge time, so that the measurement is accurate, and it is not necessary to extend the time for one cycle at the same time, so that the productivity does not decrease. Needless to say, there is no problem when the ejection time is shortened. An example of a filling device having two weighing cylinders is described in Japanese Utility Model Laid-Open Publication No. Hei 7-22901. However, this filling device is designed so that two weighing cylinders measure one bag. The technical idea is completely different from the present invention in which the length of each measuring cylinder is shortened to increase the measuring accuracy, and the measuring accuracy is increased by increasing the suction time. In addition, since one bag is filled by discharging two measuring cylinders, there is a problem in productivity.

Further, in the filling device of the present invention, the hose and the discharge mouthpiece 30 can slide in the length direction while maintaining the watertightness, and at the same time, the entire measuring section A is made as shown in FIG. Because it is elastically movable between the solid line and the imaginary line, for example, at the time of discharging the filler, when the pressure in the flow path increases for some reason, the measuring unit A moves in the direction of the imaginary line,
The length of the filling channel 29 is increased by that amount (the volume is increased), the pressure is absorbed, the load on the driving means of the piston rods of the measuring cylinders 21 and 22 is reduced, and the damage can be prevented. . In addition, the hose and the discharge base 3
Instead of allowing the 0 to slide, a telescopic bellows may be interposed somewhere in the filling channel.

Further, in the filling device of the present invention, the filling nozzle body is moved up and down by the mechanical cam 27 linked to the packaging machine body, so that only the filling nozzle body 6 stops at the lower end during the operation of the filling device. This is not the case (when the filling nozzle body 6 stops at the lower end, the packaging machine body such as the transfer device also stops at the same time), and the bag W
There is no problem in that the filling nozzle body 6 and other devices are damaged by the contact of devices such as the gripping chuck 13 and the like. In addition, in the filling device of the present invention, the flow path opening / closing valve 7 is moved up and down by the multi-position cylinder 28, and the flow path hole 6
Since b is closed (see FIGS. 2 and 3), for example, when the bag W is not gripped by the gripping chuck 13 due to bag supply mistake or the like, even if the measuring cylinder 21 or 22 starts the discharging operation, As long as the flow path opening / closing valve 7 is at the intermediate position (for example, when the absence of the bag W is detected, the flow path opening / closing valve 7 may be set so as not to move from the intermediate position). There is the advantage that the filling does not leak. Alternatively, the measuring cylinder 21 or 2
In 2, the switching valve 23 or 24 is set so as not to switch from the suction position even when the piston rod 25 or 26 itself rises and enters the discharging operation, and the flow path opening / closing valve 6 does not move from the intermediate position. If it is set, no pressure is applied to the inside of the filling channel 29, and the filling does not leak from the filling nozzle body 6. That is, in this case, the filler sucked into the measuring cylinder 21 or 22 is returned to the side storage tank 1.

The filling device shown in FIG. 6 is an example in which the form of the valve member and the filling channel is different from the filling device shown in FIGS. In the metering section A of this filling device, the ports serving as the discharge ports of the three-way switching valves 33 and 34 in the valve member 32 are separate, and discharge paths 33c and 34c that face in opposite directions are formed. , 34c ejection bases 35, 36
Are connected to filling channels 37 and 38, respectively. The filling channels 37 and 38 merge on the downstream side, and are connected as one filling channel 41 to, for example, the filling nozzle B shown in FIG. A flow path switching valve 42 is provided at the merging portion, and one of the filling flow paths 37 and 38 (the side on which discharge is performed) and the filling flow path 41 are alternately communicated. By the operation of the flow path switching valve 42, each filling flow path 3
The pressure in the flow path on the discharging side does not affect the flow path on the non-discharging side of 7, 38, so that there is little decrease in the measuring precision due to the swelling of the hose, etc. Can be maintained.

[0022]

According to the filling device of the present invention, even if the filling material has a relatively high viscosity, the measuring accuracy by the measuring cylinder does not decrease and the productivity does not decrease. Further, by making the length of the filling channel expandable and contractable according to the internal pressure, even when the pressure in the channel increases at the time of discharging the filler, the driving means of the measuring cylinder may be damaged. Furthermore, even if the filling nozzle body stops at the lower end during the operation of the packaging machine, the filling nozzle body and other devices are not damaged.

[Brief description of the drawings]

FIG. 1 is a view showing a measuring section of a filling device according to the present invention.

FIG. 2 is a view showing a filling nozzle of the filling device according to the present invention, showing a state when the nozzle body is at a lowered position.

FIG. 3 is a diagram showing a state when the vehicle is in a raised position.

FIG. 4 is a diagram illustrating the operation of a filling nozzle.

FIG. 5 is a diagram showing an operation timing of a measuring cylinder.

FIG. 6 is a view showing another example of the measuring section of the filling device according to the present invention.

FIG. 7 is a view showing a conventional filling device (during discharge).

FIG. 8 is a view showing a conventional filling device (at the time of weighing).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage tank 5 Filling nozzle holder 5a Flow path opening 6 Filling nozzle main body 6a Discharge port 6b Flow path hole 7 Flow path opening / closing valve 7a Air outlet 20 Valve member 21,22 Measuring cylinder 23,24 Three-way switching valve 23a, 23b , 24a, 24b Metering path 23c Discharge path 27 Mechanical cam 28 Multi-position cylinder 29 Filling path A Metering section B Filling nozzle

Claims (5)

[Claims] 1. A storage tank for filling material, two measuring cylinders installed downstream of the storage tank and repeating suction and discharge, and two measuring paths respectively connecting the storage tank and the respective measuring cylinders. In a filling device of a packaging machine in which a three-way switching valve is arranged in a measuring path, and a discharge port of each switching valve or a downstream side thereof merges and is connected to a filling nozzle as one filling channel, measurement is performed by each measuring cylinder. The amount of the filled material is set so as to correspond to the filling amount for one empty container, and each of the measuring cylinders alternately discharges the filling material. Filling device for a packaging machine, which is also set to be long. 2. The filling device for a packaging machine according to claim 1, wherein the length of the filling flow path from each switching valve to the filling nozzle can expand and contract according to the internal pressure. 3. A fixed filling nozzle holder, wherein the filling nozzle has a cylindrical shape and a passage opening for filling is formed on a side surface;
A filling nozzle body which is cylindrical and has a discharge port at the tip and a filling material flow path hole is formed on the side surface. The filling nozzle body slides up and down inside the filling nozzle holder, and the filling nozzle moves up and down by sliding inside the filling nozzle body. A nozzle for opening and closing the flow passage of the nozzle body, a flow opening / closing valve having an air outlet at the tip is provided, and the filling nozzle body is moved up and down by a mechanical cam interlocked with the packaging machine body. Overlaps the flow path opening of the filling nozzle holder, and the flow path hole becomes a position completely displaced from the flow path opening of the filling nozzle holder at the rising end, and the flow path opening / closing valve moves up and down together with the filling nozzle body by the mechanical cam. ,
The multi-position cylinder moves up and down with respect to the filling nozzle body. At the rising end of the multi-position cylinder, a passage hole of the filling nozzle body is opened to communicate with the discharge port. 3. The filling device for a packaging machine according to claim 1, wherein the hole is closed, and an air outlet at the tip is projected from the discharge port at a lower end. 4. A storage tank for filling material, a measuring cylinder installed downstream of the storage tank and repeating suction and discharge,
Equipped with a measuring path connecting the storage tank and the measuring cylinder,
In a filling device of a packaging machine in which a three-way switching valve is disposed in a measuring path and a filling flow path connecting a discharge port of the switching valve and a filling nozzle is provided, the length of the filling flow path is A filling device for a packaging machine, which can expand and contract according to pressure. 5. A fixed filling nozzle holder having a cylindrical shape and having a flow path opening for the filling material formed on a side surface thereof, and a filling nozzle having a cylindrical shape having a discharge port at a tip end and a flow path hole for the filling material formed on a side surface. A filling nozzle body that slides up and down in the holder, and a passage opening / closing valve that slides up and down in the filling nozzle body to open and close the passage hole of the filling nozzle body and has an air outlet at the tip. The filling nozzle main body is moved up and down by a mechanical cam interlocking with the packaging machine main body. At its lower end, the flow passage hole overlaps with the flow passage opening of the filling nozzle holder, and at the rising end, the flow passage hole flows through the filling nozzle holder. It becomes a position completely displaced from the passage opening, the flow passage opening / closing valve is moved up and down together with the filling nozzle body by the mechanical cam, and is moved up and down with respect to the filling nozzle body by a multi-position cylinder. Rise At the end, the flow path hole of the filling nozzle body is opened to communicate with the discharge port, the flow path hole of the filling nozzle body is closed at the intermediate position, and the air outlet at the tip is projected from the discharge port at the lower end. Filling nozzle of packaging machine.