JPS5837174B2 - packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves covering a large number of objects to be packaged arranged at equal intervals in a cylindrical shape with a band-shaped plastic film, and then cutting the cylindrical film between the troughs of the objects to be packaged. The present invention relates to a wrapping machine that simultaneously folds the two ends of the cut film onto the bottom surface of the tray, so that the film can be kept in a tensioned state at all times and wrapped on the object to be wrapped without causing wrinkles in the film. It is characterized by this.

For example, a conventional packaging machine of this kind produces a packaged product by covering a tray containing fresh food in a cylindrical shape with a film, and then folding both ends of the film onto the bottom surface of the tray. Because the structure was such that the end of the film was folded to the bottom of the tray while being transported continuously, the body of the packaging machine was inevitably long.

Moreover, when the cylindrical film is cut between the front and rear trays (wrapping objects), the film under tension contracts, causing wrinkles on the top surface of the wrapping object, and the edges of the X-film are bent.

In the present invention, two endless rotating bodies each having a plurality of through holes are installed before and after the cutting blade, and by the movement of these rotating bodies, the ends of the two films of the front and rear packaging objects are simultaneously cut. The object of the present invention is to provide a packaging machine that can fold the wrapping material onto the underside of the packaged item while maintaining the tensioned state.

Embodiments of the present invention will be described below based on the drawings.

The tube-making unit 1 shown in FIG. 3 has the function of forming a band-shaped film into a tube C and sequentially wrapping the objects A, A, etc. in the tube C.
A... means the side belt conveyors 2, 2 shown in Fig. 1.
The sheet is held from both sides by the belt conveyors 2, 2, and is intermittently conveyed in the direction of the folding device 3 by one pitch P by the intermittent rotation of the belt conveyors 2, 2.

The folding device 3 comprises a pair of front and rear endless rotating bodies 4, 5 each having a plurality of through holes 6, 6, . . . .

As shown in FIG. 2, the endless rotating bodies 4, 5 have a large number of elongated rollers 8 between the left and right endless chains 7, 7.
, 8 . As shown in FIGS. 1 and 2, chain wheels 10, 10, 11,
11, 12, 12, 13, 13, 14, 14 so that each of the rollers 8, 8... is orthogonal to the side belt conveyors 2, 2, 15, 15 provided before and after the folding device 3. The layout relationship is as follows.

In particular, the endless rotating bodies 4 and 5 each form a loop surrounding three chain wheels 10, 12, and 13, and tension is applied from the outside of this loop with the remaining chain wheel 11.
Horizontal part 16, 16 between two chain wheels 11, 12
is formed.

Furthermore, a cutting blade 17 is provided between the endless rotating bodies 4 and 5.
has been established.

As shown in FIG. 2, the cutting blade 17 has guides 1B and 1 on both sides
It moves up and down along 8, and both ends are connected to rods 19, 19.
It is operated by.

The present invention is constructed as described above, and its operation will be explained below.

Fig. 1 shows a state in which the front and rear endless rotating bodies 4 and 5 are stopped, and in this case, the packaged object A is conveyed by the side belt conveyor 252t15t15 (7) into the four through holes 6... The endless rotating bodies 4 and 5 are set to be stopped in advance at a position where the valley through holes 6 coincide with each other so that the endless rotating bodies 4 and 5 can pass through.

When the packaged object A passes through each of the through-holes 6, the endless rotating bodies 4 and 5 rotate by one pitch in opposite directions and stop again in the state shown in FIG. The setting is such that intermittent rotation is performed.

On the other hand, in FIG. 3, the tube C wound around the packaged article A in the tube making section 1 is intermittently conveyed together with the packaged article A by a side belt conveyor at 1 pitch P. Two packaged items At before and after
It is set to stop when A is located.

Then, as shown in Fig. 3, the troughs to be packaged A, A are folded into the folding device 3.
When it stops before and after, the cutting blade 17 first descends to cut the tube C between the front and rear packaged objects A, A.

Then, the front and rear endless rotating bodies 4 and 5 begin to rotate in opposite directions.

Therefore, as shown in FIG. 4, the end C1 of the tube protruding from the rear end of the front object to be packaged A1 is hooked on the roller 8 at the edge of the through-hole, and the object to be packaged A1 at the horizontal portion 16
It is folded into the bottom of the .

At the same time, the end C2 of the tube protruding from the front end of the rear object to be packaged A2 is hooked on the roller 8 at the edge of the through hole and folded into the lower surface of the object to be packaged A2.

Therefore, the calculation is essentially the same as if both ends of the tubes at the front and rear of the packaged product were folded into the bottom surface of the packaged product at the same time.

When the front and rear endless rotating bodies 4, 5 stop in the state shown in FIG. 1, each packaged article A, A, . . . is conveyed by one pitch.

In the above action, especially as shown in FIG. 3, when the cutting blade 17 is lowered, the front and rear endless rotating bodies 4, 5
By rotating in opposite directions, the middle of the film is lifted upward by the lower edge of the two inner through-holes, while the film near the packaged object is lifted upward by the lower edge of the two outer through-holes. By pressing downward at the edge of the hole, the film is bent in a taut manner, and the film can be cut while entangled with each roller 8 at a steep angle.
The moment the film is cut with the cutting blade 17, the film cannot shrink due to friction with the roller and the object to be packaged, and furthermore, the edge of the film is bent under the object to be packaged as shown in Fig. 4. Wrinkles due to film shrinkage do not appear on the top surface of the package.

As mentioned above, the present invention includes a pair of side belt conveyors 2, a pair of side belt conveyors 2 and
A folding device 3 consisting of two endless rotating bodies 4 and 5 in the front and rear is provided via the endless rotating bodies 4 and 2, and side belt conveyors 15 and 15 are provided at the rear of the folding device 3, and the endless rotating bodies 4, 5 each has a plurality of through holes 6
, 6 .
The intermediate chain wheels 11, 11, 12, 12 form horizontal portions 16, 16 in opposite directions, and when these two endless rotating bodies 4, 5 are intermittently rotated in opposite directions and stopped, four The through holes 6, 6, 6, 6 are aligned so that the article to be packaged A can pass through, and the side belt conveyors 2, 2, 15, 15 and the endless rotating bodies 4, 5 alternately and intermittently rotate. Because I did it like that,
The objects to be packaged that are intermittently conveyed are stopped before and after the folding device 3, and the end of the tube at the rear end of the object to be packaged in the front position and the end of the tube at the front end of the object to be packaged in the rear position are folded at the same time. This is essentially the same as folding the front and rear ends of the film on the bottom surface of one packaged item A at the same time, and folding the ends of the front and rear tubes twice separately as in conventional packaging machines of this type. Efficiency is improved compared to a method in which the film is folded in two parts, and the body of the packaging machine can be made more compact.Especially when the cutting blade moves downward, the front and rear endless rotating bodies 4 and 5 operate to apply tension to the film while cutting. Since the end of the film can be folded onto the underside of the object to be packaged using an endless rotating body, it is possible to wrap the object without creating any wrinkles on the top surface of the object. It has a simple structure without a complicated structure and has the effect of a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a view taken along lines 1 and 2 of the previous figure, and FIGS. 3 and 4 are action explanatory diagrams. A: Item to be packaged, C: Tube, 1
・・・・・・Cylinder making section, 2・・・・Side belt conveyor, 3：Folding device, 4, 5：Endless rotating body, 6：・・・・Through hole, 8...
... Roller, 15 ... Side belt conveyor, 17 ... Cutting blade.

Claims (1)

[Claims] 1. Two pairs of front and rear sides, one pair on each side, are installed at the rear of the tube-making section 1, which wraps the objects A, A, etc. to be packaged at equal intervals in a tube C formed by a film. Belt conveyors 2, 2, and 15.15 are installed to rotate intermittently at a constant pitch to form a track for conveying the packaged items by pinching them from both sides, and cutting blades are installed between the front and rear side belt conveyors. 17 is installed so as to descend when the side belt conveyor stops, and two endless rotating bodies 4 and 5 are installed between the front and rear side belt conveyors across the cutting blade. , the endless rotating bodies 4, 5 are each provided with a plurality of through holes 6, 6..., and the upper chain wheel 1 is arranged so as to interrupt the trajectory for conveying the article to be packaged A.
0, 10 and the lower chain wheels 13, 13 form the vertical part, and the intermediate chain wheel ILIL12
, 12 form horizontal portions 16, 16 in opposite directions,
When these two endless rotating bodies 4, 5 are intermittently rotated in opposite directions and stopped, the four through holes 6, 6, 6,
6 are aligned so that the article to be packaged A can pass therethrough, and the side belt conveyors 2, 2, 15, 15 and the endless rotating bodies 4, 5 alternately and intermittently rotate.