JPH0230922B2 - JIDOHOSOKI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for automatically packaging objects such as foods.

(Prior art) Various devices have been proposed and adopted for automatically packaging not only the above-mentioned foods but also other products, but unlike fully automatic packaging production in large-scale factories, relatively small-scale When packaging various types of products in factories, a pair of independent weighing machines and automatic packaging machines are usually used, and a predetermined amount of weighed material is sent intermittently from the scale in synchronization with the wrapping operation of the automatic packaging machine. receiving the packaged item in a filling hopper of the automatic packaging machine;
The product is put into a packaging bag placed at the bottom of the filling hopper, and after the bag is sealed, it is sent out as a packaged product from an automatic packaging machine.

(Problem to be solved by the invention) By the way, most of the packaging bags used for automatic packaging are made of synthetic resin, and are made by forming a strip of packaging film into a tube shape and then cutting it into lengths for each bag. It is common to form a bag by sealing the bottom and then heat-sealing the opening of the bag after filling it with the material to be packaged. Therefore, conventionally, a cylindrical forming chute is connected to the lower part of the filling hopper and a tube-like packaging film is placed over it, or a band-like packaging film is inserted into the cylindrical forming chute through a forming plate. It has been proposed that the tube-shaped packaging film is wound around the packaging film, and the tubular packaging film is fed down by a pressure roller in conjunction with the wrapping operation.

However, according to the above method, due to the close contact between the forming chute and the tubular packaging film, it is difficult to feed the film based on the slip of the pressure roller, and to prevent this, the film feeding structure becomes complicated and the packaging Since the film cannot be fed during operation, high-speed packaging is hindered by the time required for film feeding.

Therefore, the present invention provides a stable packaging operation and simplifies the structure by supplying a packaging bag whose bottom has been sealed in advance to the packaging section, and also overlaps the supply of the packaging bag with the operation of discharging the packaged product. The aim is to realize high-speed packaging by this method.

(Means for Solving the Problem) The present invention provides a clamping means for clamping both ends of the bag opening of a packaging bag carried into a packaging department, an opening means for opening the clamped bag opening, and an opening for opening the opened bag. a filling means for filling the packaged item through the opening; a sealing means for heat-sealing the bag opening after filling; a product holder located below the clamping means and supporting the bottom of the packaging bag; A packaging bag carrying means whose end faces an intermediate position between the clamping means and the product pedestal, and after the heat sealing, moves from a position directly below the terminal end of the packaging bag carrying means to an elevated position connecting the clamping means and the terminal end of the packaging bag carrying means. The packaging machine is characterized by an automatic packaging machine comprising a possible product discharge plate.

(Example) The present invention will be explained below using an automatic packaging machine shown in the drawings.

FIG. 1 shows the overall configuration of an automatic packaging machine, which includes a packaging film loading section A, a packaging film bottom sealing section B, a packaged object filling section C, and a packaging section D.

A packaging film roll 1 is supported by a support shaft 2 and is freely rotatably loaded into the packaging film loading section A. This packaging film roll 1 is made by winding a tubular packaging film 1a made of synthetic resin into a paper tube. It reaches the bottom seal part B.
A pair of pulling rollers 5a and 5b are mounted on a shaft just before the packaging film bottom sealing part B to sandwich the tubular packaging film 1a from above and below, and by driving one of the pulling rollers 5b with a motor, the tubular packaging film 1a is The packaging film is pulled out from the loading section A.

reading a sense mark printed on the tube-shaped packaging film 1a at a proper position between the packaging film loading section A and the packaging film bottom sealing section B;
For example, a photoelectric sense mark reader 6 is provided. Sense marks are printed on the tube-shaped packaging film 1a at intervals equal to the length of one bag, and the sense mark reader 6 controls on/off the drive motor 7 of the pulling roller 5b based on the sense mark reading signal, and the sense marks are printed on the tube-shaped packaging film 1a at intervals equal to the length of one bag. The traction of 1a is performed intermittently one bag length at a time.

The packaging film bottom sealing section B performs a bottom sealing operation and a cutting operation on the tube-shaped packaging film 1a for each bag length to form a packaging bag I as shown in FIG. 7, which is then separated from the tube-shaped packaging film 1a. In FIG. 7, 8 is a bottom seal portion that seals the bottom of the packaging bag A, and 9 is a cut portion formed by the above-mentioned cutting.

That is, in the bottom sealing part B of the packaging film, a block 11 holding the heat block 10 for thermal welding is placed at the upper part of the packaging film 1a with a narrow gap between the tubular packaging film 1a, and a cutter 13 is placed in the lower part. The cutter 13 is actuated by air cylinders 12 and 14, and the cutter 13 is connected to a heat block 10 for thermal welding and a presser block 11.
It faces the narrow gap between the two. Then, the tube-shaped packaging film 1 is pulled by the pulling rollers 5a and 5b.
After pulling a length of one bag, the air cylinders 12 and 14 are activated, and the heat welding heat block 10 seals the bottom of the tube-shaped packaging film 1a inserted between it and the heat welding table 15, and at the same time, the presser block 11 The tube-shaped packaging film 1a is held between the presser table 16, and the cutter 13, which rises from below, moves between the heat-welding table 15 and the presser table 16, and the tube-shaped packaging film 1a is pressed at two places in this way. The film is passed through and cut, and the bottom-sealed packaging bag is separated. Note that the film cutting by the cutter 13 is performed with a slight time lag with respect to the bottom sealing operation.

The thus separated packaging bag I waits with its tip stuck into the packaging bag carrying means 17, and after the preliminary wrapping operation in the packaging section D is completed, it is carried into the packaging section D as described later. Although the structure of the packaging bag carrying means 17 is not particularly limited, in the drawing, it includes a conveyor 17a and pressure rollers 17 that press against each conveyor roller 17b of the conveyor from above.
The conveyor 17a is driven by a drive motor 18.

The packaging section D provided facing the terminal end of the packaging bag carrying-in means 17 includes a pair of clamping means 19 for clamping both ends of the bag opening of the carried-in packaging bag I, and a pair of clamping means 19 located above the terminal end. It has a vacuum means 20 on the upper side for forcibly opening the closed bag mouth of the carried-in packaging bag, and is provided with a product holder 21 at a position below the end of the packaging bag carrying-in path and directly below the clamping means. ing. Further, a filling hopper 22 shown in FIG. 1 is installed at the upper stage of the packaging section D.

More specifically, as is clear from FIGS. 1 and 2, each clamping means 19 has a pair of clamping pieces 19a and 19b that clamp the packaging bag A from the front and back and move toward and away from each other. In addition, these clamp pieces 19a and 19b are connected to the guide rod 2.
3 and 23 so as to be freely slidable and movable in a lateral direction perpendicular to the above-mentioned separation direction.
In the structure shown in FIG. 2, one clamp piece 19a is fixedly connected to the mounting frame 24, and the other clamp piece 19b is attached to the mounting frame 24 via a solenoid 25. It has a structure in which it comes into contact with and away from 19a. In addition, the above mounting frame 2
4 is moved forward and backward by another solenoid 25b, so that both clamp pieces 19a and 19b are moved in the lateral direction integrally.

The vacuum means 20 includes a pair of vacuum heads 2 that sandwich the packaging bag from the front and back and perform a relative movement toward and away from the packaging bag.
0a, 20b, each vacuum head 20
An intake hole 26 is opened at the center of each of the facing surfaces of the a and 20b. Of course, this intake hole 26 is connected to an air pump (not shown) via a pipe 27. In addition, in Figure 2,
Reference numeral 28 designates a guide rod that supports and supports each vacuum head 20a, 20b and guides the above-mentioned relative movement toward and away from each other, and 29a and 29b designate air cylinders as means for driving the movement.

By the way, since the packaging bag A is made of a synthetic resin film and is sent to the packaging section D in a flat and tightly adhered form, it is difficult to open the bag opening at once against the adhesion force using only the vacuum means 20. This can lead to packaging errors. Therefore, a pair of left and right air nozzles 3 facing the tip of the clamped bag mouth are placed directly above the vacuum means 20.
0 and 30 are piped, and the air blown from the air nozzles 30 and 30 slightly expands the tip of the bag mouth, and then the bag mouth is pulled apart by the vacuum means 20, that is, the bag mouth is opened properly. There is.

Further, the vacuum means 20 is also integrally equipped with heat sealing means for the opening of the packaging bag, and a heat welding heater 31 is fixed to one of the facing surfaces of each vacuum head 20a, 20b, and a heat welding table 32 is fixed to the other side.
is fixed.

The product pedestal 21 is pushed up to a horizontal position by the air cylinder 33 shown in FIG. solenoid 3
4, the product holder 21 is vibrated so that the product to be packaged is reliably and densely packed inside the packaging bag. Reference numeral 35 indicates a mechanism for adjusting the height of the product holder 21 according to the length of the packaging bag to be used.

The packing material filling section C is equipped with a filling hopper 22 that receives the packing material supplied from a measuring device (not shown) directly above the filling section C, and the filling hopper 22 is installed as shown in FIGS. 1 and 4. It is fixed to the frame 36 via a support plate 37, and two rubber skirt plates 38, 38 are fixed to the hopper outlet in a state facing each other, and the cross sections of these skirt plates 38, 38 are approximately U-shaped. A substantially cylindrical filling chute portion 39 is formed in this portion, which is guided downward in a substantially C-shaped state and communicates with the hopper discharge port.

On the outside of the filling chute portion 39, chute shape regulating plates 40, 40 are positioned corresponding to and surrounding the respective skirt plates 38, 38 described above. A bracket arm 41 is connected to the upper rear surface of each chute shape regulating plate 40 in a protruding state, and by attaching the middle of this bracket arm 41 to the mounting frame 36 with a support shaft 42, the chute shape regulating plate 40 can be attached to the mounting frame 36. Hanged. In addition, a weight 43 is attached to the tip of the bracket arm 41.
is attached, a biasing force for pressing the skirt plate 38 from the outside is applied to each chute shape regulating plate 40, and the diameter of the filling chute portion 39 is reduced by the deformation of the skirt plate 38 thereby. The mounting position of the weight 43 can be varied along the elongated hole 44.

Furthermore, a curved discharge plate 45 is installed in a position directly below the terminal end of the packaging bag carrying means 17. This curved discharge plate 45 is pushed out from the above-mentioned infiltration position by the push-out mechanism 46 shown in FIG. 3, passing over the product holder 21 to a position directly below the clamping means 19, thereby performing a product discharge operation and a packaging carrying-in operation, which will be described later. The push-out mechanism 46 rotates the rotary shaft 49 via the link 48 by the air cylinder 47, and pushes out the curved discharge plate 45 as described above by the pusher block 51 held by the rotary shaft 49 via the lever 50. On the other hand, the curved discharge plate 45 is suspended from a link 53 having a pivot point 52 different from the rotating shaft 49, and its curved shape is such that when the curved discharge plate 45 is pushed out to a position directly below the clamping means 19, The plate back surface 45a connects the end of the packaging bag carrying-in means and the clamping means 19 in a curved manner.

When the packaging bag I is carried into the packaging section D by the packaging bag carrying means 17, the clamping means 19 clamps both ends of the bag opening as shown in FIG. Sandwich it from the front and back and suction it. At this time, the tip of the bag opening is attached to the bag head 20a, as shown in the figure.
20b, and air is blown from the air nozzles 30, 30 to the tip of the bag opening, causing the tip of the bag opening to become slightly open. Without leaving time for this fume, the left and right clamp means 19,
The bag opening is loosened by approaching and lateral movement in the direction of arrow a of 19, and at the same time, the front and rear bag heads 20a and 2
By moving 0b apart in the direction of arrow b, the bag opening is opened wide as shown in FIG. In this case, even if the adhesion of the packaging bag A is strong, the bag opening tip is about to open due to the air blown from the air nozzle 30 in advance, so the bag can be opened easily and reliably. and,
A weighed packaged item is put into the filling hopper 22, and when it passes from the filling hopper 22 through the filling chute section 39, the falling weight of the packaged item causes the skirt plate 3 to
8 and the chute shape regulating plate 40 are expanded outward, so that the lower ends of the skirt plate 38 and the chute shape regulating plate 40 protrude into the opened bag opening, and the filling chute portion 39 is expanded in diameter. Through this, the packaging bag A is rapidly filled with the items to be packaged.
Prior to this filling, the product pedestal 21 rises to a horizontal position as shown in FIG. 6I, supports the bottom of the packaging bag, and is vibrated as the bag is filled. When the filling is completed, the vibration is stopped, and the left and right clamping means 19, 19 and the front and rear vacuum heads 20a, 20b move in reverse to return to the state shown in FIG. 5I, and the heat welding heater 3
In step 1, the bag opening is heat-sealed, resulting in product C. During this heat sealing, the product pedestal 21 remains in a horizontal position, so that the weight of the packaged product does not act on the heat sealing portion to tear it.

When the product is manufactured as described above, the vacuum means 20 is separated from the product, and the clamp means 19 releases the product. At the same time, the push-out mechanism 46 operates as shown in FIG. 6, the curved discharge plate 45 moves forward onto the product holder 21, the product holder 21 moves downward, and the packaging bag carrying means 17 is activated. Then, during this means, a new packaging bag that is waiting is sent. Therefore, the curved discharge plate 45 that moves forward protrudes and discharges the product on the product holder 21 that moves downward, and reaches directly below the clamping means 19.
Since the packaging bag carrying-in means 17 and the clamping means 19 are bridged, a new packaging bag sent out from the end of the packaging bag carrying-in means is guided by the curved discharge plate rear surface 45a and changes its direction from the lateral direction to the upward direction while passing through the clamping means. Then, as shown in FIG. 6, the clamping means 19 clamps the new packaging bag, and the vacuum means 20 also clamps the opening of the bag, and then the opening of the next bag. Prepare for opening operation. Along with this, the curved discharge plate 4
5 moves back to its original position (FIG. 6), and the same wrapping operation is repeated thereafter.

(Effects) As described in detail above, according to the present invention, instead of forming a packaging bag from a tube-shaped packaging film in the packaging section, a pre-formed packaging bag is carried into the packaging section, and the bag is clamped by the clamping means. Clamp it with
In addition, since the opening of the bag is opened using an opening means and the packaged items are filled into the opening, there is no problem with film feeding as in the past, and there is no need to complicate the structure. Enables stable packaging.

Moreover, at the same time as the discharge plate discharges the packaged product, the clamping means and the packaging bag carrying-in means are connected and a new packaging bag is carried into the clamping means. There is no need to set up, which reduces packaging time.
High-speed packaging can be achieved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway side view of an automatic packaging device, Fig. 2 is a perspective view of the packaging section, Fig. 3 is a perspective view of the curved discharge plate portion,
FIG. 4 is a perspective view of the filling section, FIG. 5 I is an explanatory diagram of the opening operation of the bag opening, FIGS. 6 I to 6 are explanatory diagrams of the packaging operation, and FIG. 7 is an external view of the packaging bag. 17... Packaging bag carrying means, 19... Clamping means, 20... Vacuum means (opening means), 21
... Product pedestal, 31 ... Heater for heat welding (sealing means), 45 ... Product discharge plate, C ... Filling section (filling means), D ... Packaging section, A ... Packaging bag.

Claims (1)

[Claims] 1 Clamping means for clamping both ends of the bag opening of a packaging bag carried into the packaging department, opening means for opening the clamped bag opening, and filling means for filling the packaged item through the opened bag opening. a sealing means for heat-sealing the mouth of the bag after filling; a product holder located below the clamping means to support the bottom of the packaging bag; and a terminal end at an intermediate position between the clamping means and the product holder and a product discharge plate that is movable from a position immediately below the end of the packaging bag transport means to an elevated position connecting the clamp means and the end of the packaging bag transport means after the heat sealing. .