JPH0760109B2 - Package weighing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention seals the upper end of a bag containing articles therein,
Next, the present invention relates to a device for dropping the bag and measuring the weight of the bag while it slides down a weighing platform that is inclined like a slide.

[Conventional technology]

A bag is filled with a roughly specified amount of articles by a suitable weighing and filling device, then the upper opening of the bag is sealed, and the bag is dropped and supplied near the upper end of the slidable slanted weighing platform. , While this bag is sliding down on the weighing platform, weigh and remove the bags with insufficient weight based on the weighing result, and feed the weighing result to the above-mentioned weighing and filling device. It has been practiced to correct the filling amount.

This will be described with reference to FIG. As shown in FIG. 3A, the tubular material 2 is supplied from above along the outer surface of the filling cylinder 1 of the weighing and filling device, and the lower end thereof is sealed by the sealing portion 3 to form the bag 4 Is formed. Under the filling cylinder 1, the welders 5 and 6 having a U-shaped cross section are located with the tubular material 2 in between, and a cutter 7 is provided inside one of the welders 6.
As shown in FIG. 2B, when the bag 4 is filled with the article, the welders 5 and 6 move to sandwich the tubular material 2 therebetween to seal the tubular material 2 at the same time. Disconnect. By this sealing and cutting, the upper end of the bag 4 is sealed by the sealing portion 9 and simultaneously separated from the tubular material 2 as shown in FIG. The lower end is also sealed by the sealing portion 10. After that, as shown in FIG.
When returns to the old position, the bag 4 is released and falls.

Reference numeral 11 is a mounting base that is inclined like a slide, and an upper running plate 12 that is also inclined like a sliding base is arranged at the upper end of the mounting base 11.The mounting base 11 is supported by a base 14 via a load cell 13, and the running support plate 12 is a support post.
It is supported by the base 14 by means of 15. The bag 4 described above falls to a position near the upper end of the runner plate 12 and slides down on the runner plate 12 and the platform 11. When it reaches the vicinity of the lower end of the platform 11, its position is detected by the detector 16, and the output of the load cell 13 at that time is taken out as a weighing signal.

[Problems to be solved by the invention]

In order for the above-mentioned measuring instrument to weigh accurately, the bag 4 is the detector 16
It is necessary that the output signal of the load cell 13 be in a steady state when the position of the table 11 and the approach plate 12 are reached.
The length of is made to the minimum dimensions needed for it. Therefore, when it falls to the point B below the regular drop point A, the weighing accuracy is lowered, and when it falls to the point C above the point A, the bag 4 is not placed on the run-up plate 12. There is. However, when the welders 5 and 6 carry out a releasing movement, the bag 4 may often be attached to one of the welders and moved, and when attached to the welder 5, the bag 4 falls to the point B and is attached to the welder 6. When attached, it falls to point C.

Further, when the welders 5 and 6 perform a releasing movement, one end of the sealing portion 9 is attached to the welder as shown in FIG. 6 and the release is delayed, which causes the bag 4 to drop in an inclined posture. There is.
In this case, when the bag 4 is detected by the detector 16,
Since the posture is not correct, a weighing error may occur.

The present invention is intended to always carry out highly accurate weighing by dropping the bag at the correct position on the weighing machine in the correct posture.

[Means for solving problems]

Like the conventional apparatus shown in FIG. 5, the present invention has a detector for detecting passage of a bag near the lower end of a platform inclined like a slide, and the bag containing the article is placed on the table described above. While sliding down, weigh the weight, and clamp the pressure gauge from both sides with the weighing instrument configured to take out the measured output signal when the detector detects the bag. And a pair of welding devices for sealing. The welder is located above the table or above the upper end of the runner plate that is also placed in front of it and is also inclined like a slide, and is configured to drop the bag by ending the sealing and releasing the clamping pressure. There is.

As a feature of the present invention, a holding means is provided below each of the welders. The holding means holds the portion close to the opening of the bag when the welding device presses the opening of the bag for sealing, and the welding device completes the sealing and shifts to an open state. At this time, the holding state is changed to the open state with a slight delay.

In addition, the force for holding the bag of the holding means is sufficient if it exceeds the force required for peeling the bag stuck to the welding device,
The bag need not be large enough to be suspended in the air.

[Work]

When the fuser finishes sealing and shifts to the open state, the holding means continues to hold the state for a while. For this reason, even if the sealing portion of the bag is attached to the welder, it cannot move together with the welder, so the attachment is separated. And
When the holding means is released, the bag falls directly below. Therefore, the bag can be always dropped in the correct position on the platform or the running board in the correct posture.

〔Example〕

In FIG. 1, the welders 5 and 6 are the same as those outlined in FIG. 5, and are located on both sides of the tubular material 2. Each of the welders 5 and 6 has a U-shaped cross section, an upper portion is a bag bottom sealing portion 5a and 6a, and a lower portion is a bag opening sealing portion 5b and 6b. The inside of the welding device 6 is a cutter. 7 is located.

Cylinders 23, 23 of the holders 21, 22 are fixed to the lower portions of the welders 5, 6, respectively. 24 and 24 are holding members for holding the bag 4, and the rods 25 and 25 to be extended are
In the cylinders 23, 23 that pass through the cylinders 23, 23, penetrate the cylinder bottom and extend to the outside, the holding members 24, 24
The rods 25, 26 for pressing the rod toward the bag 4,
Adjusting nuts 27, 27 are screwed to the portions of the rods 25, 25 provided around the rod 25 and penetrating the cylinder bottom of the rods 25, 25 to the outside.

The operation of the above apparatus will be described with reference to FIG. First, as shown in FIG. 3A, the welders 5 and 6 press the material 2 to seal the bag opening 9 and the subsequent bag to the bottom 10 and to seal the material between both sealing parts. 2 is cut by a cutter 7. At this time, the clamping members 24, 24 of the holders 21, 22 are the bags 4
Are in a retracted position in which the springs 26, 26 are compressed by pushing each other.

Due to the movement in the direction of the arrow shown in FIG. 2 (a), even if the welders 5 and 6 are first opened as shown in FIG.
4 and 24 continue to hold the bag 4 by stretching the springs 26 and 26. This allows the bag 4 to be melted due to the melting of the material when the bag mouth is sealed.
Even if is adhered to the welder 5 or 6, it is peeled off at this point. Since the material is not melted at the positions of the holding members 24, 24, the bag 4 is not attached to these holding members.

When the welders 5, 6 are further retracted by the movement in the direction of the arrow shown in FIG. 2 (b), the holding nuts 21, 22 are adjusted by adjusting nuts.
Since 27, 27 abut on the bottoms of the cylinders 23, 23, the holding members 24, 24 can no longer continue holding the bag 4, and are brought into an open state as shown in FIG. 2 (c). Therefore, the bag 4 falls. In this way, the bag 4 adheres to the welder 5 or 6 and drops without moving, so that it is always dropped at the correct position A on the weighing device 17 shown in FIG. 5 in the correct posture.

In the embodiment shown in FIG. 3, holding devices 33 and 34 are provided on the mounting surfaces 31 and 32 of the devices supporting the welders 5 and 6, respectively. These holding devices have U-shaped mounting members whose both ends are fixed to the mounting surfaces 31 and 32, respectively.
35, 35 and the straight center part 35 of both legs are the mounting members 35, 35
a and 35a, which are composed of filaments 36 and 36 supported by windings. The straight central portions 36a, 36a of the ridges 36, 36 are parallel to the sealing portions 5a, 5b, 6a, 6b of the welders 5, 6, and when the welders 5, 6 are open, these It slightly projects a distance d from the sealing portion.

Also in the third embodiment shown in the figure, when the welders 5 and 6 are opened after the sealing of the bag mouth is completed, the bag 4 is held by the bag 4 at the beginning of opening, and the linear center portion 36a of the gripping devices 33 and 34 is formed. It is held between 36a, and when the distance between the welders 5 and 6 is 2d or more, the holding device
33 and 34 are opened.

In the embodiment shown in FIG. 4, the holding devices 41, 42 located below the welders 5, 6 are linear drives 43, 43 such as solenoids or fluid cylinders, and a plunger extending from these drives. 44, 44, holding members 45, 45 attached to the tips of the plungers, and springs 46, 46 for urging the plungers in the extruded state.

In this embodiment, the sealing of the bag mouth is completed and the welder 5,
When 6 is opened, the driving time is slightly delayed by a timer or the movement of the welder 5 or 6 is detected by a detector 47 provided at a proper position.
43, 43 is operated to pull the holding members 45, 45 apart to open them.

〔The invention's effect〕

As will be apparent from the above-described embodiments, the present invention uses a weighing machine having a platform inclined in a slide shape for weighing a packaged article that has been packaged, and the bag slides down on the platform. Although the weighing operation is performed while the bag is closed, a holding device is installed below the welding device that seals the bag mouth so that the holding device opens a little later than the opening of the welding device. Therefore, the bag moves along with the opening movement of the welder as it adheres to the welder, which changes the dropping position on the measuring instrument and delays the part of the bag mouth from leaving the welder. As a result, it is possible to effectively prevent the dropping posture of the bag from being changed and the weighing accuracy of the weighing device to be lowered.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention, FIG. 2 is an explanatory view of a process of its opening operation, FIG. 3 is a vertical sectional view and a bottom view of another embodiment of the present invention, and FIG. Is a vertical sectional view of still another embodiment of the present invention, and FIGS. 5 and 6 are vertical sectional views of a conventional device. 4 ... Bag, 5 and 6 ... Welder, 8 ... Article, 11 ... Stand, 17 ... Weighing machine, 21 and 22 ... Holding device, 33 and 34 ...
Holders, 41 and 42 ... Holders.

Claims (1)

[Claims] 1. A detector for detecting passage of a bag is provided in the vicinity of a lower end of a platform inclined like a slide, and the weight of the bag containing the articles is measured while the bag is sliding down on the table. , A measuring instrument configured to take out the measured output signal when the detector detects the bag, and a position above the upper end of the above-mentioned stand or the run-up plate which is placed in front of the above-mentioned stand and slanted like a slide. Then, a pair of welders configured to perform sealing while pressing the opening of the bag containing the article from both sides and to release the pressing force so that the bag slides down on the table described above. In the packaging and weighing device consisting of, a portion near the opening of the bag is clamped below each of the above-mentioned welders when the bags are clamped, and when the above-mentioned welder shifts to an open state, a slight delay occurs. The provision of clamping means configured to shift to the open state Packaging and weighing apparatus according to symptoms.