JPH0141719Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transport mechanism of a flexible sheet folding and transporting device, which is designed to facilitate folding and stacking of soft sheet products such as flexible polyethylene sheets.

Conventionally, many products (plastic bags) etc. manufactured using flexible polyethylene sheets have extremely thin walls and are extremely light in weight. Moreover, it is slippery and is charged with static electricity, so its workability is often not as good as other materials, and most post-processing is done manually.

This invention prevents the flexible polyethylene sheet from flying upward when it is folded and is transported by a parent-child flat belt, and also prevents the sheet from falling into a stable position at a downward angle (e.g.
The purpose is to discharge the water at an angle of 1.5° to 10°). Next, it will be explained with reference to the drawings.

In the bending transfer device to which the present invention is applied, the first,
As shown in Figure 2, a commercialized planar soft polyethylene sheet A (hereinafter referred to as the sheet) is bent at the bending position with a thickness of approximately 2 mm, the tip edge of which has a semicircular cross section and a straight edge. Apply the edge 1 blade,
It is fed through the gap between the guide plates 2 to the contact position in the V-shaped groove 9 of the rotating parent-child flat belts 3 and 4 stretched in a V-shape. At this time, the guide roller 5,
6 is located at a position where the parent and child flat belts 3 and 4 form a V-shape around the moving center surface of the edge 1;
Both flat belts 3,
The sheet A that has come into contact with the belt 4 is peeled off from the edge 1 while still being folded, and is wound between both flat belts 3 and 4, maintaining an opening angle of around 6 degrees, which is suitable for being transported. It has been adjusted.

Ordinary soft polyethylene sheets are slippery and have uneven thickness, distortion and wrinkles due to contraction and expansion, and when charged with static electricity, they repel each other and make positioning difficult, but Edge 1, which has a straight blade, is always uniform. has the advantage of being able to create straight creases. In addition, the edge 1 and the flat belts 3 and 4 are in contact with each other,
Even if they collide, the elasticity of the belt prevents both from being damaged.

Furthermore, the linear blade of edge 1 is parallel to the bottom of the V-groove, and is wound evenly and simultaneously onto the flat belt stretched in parallel below the guide rollers 5 and 6, so that There is almost no air entrapment in the process, and post-processing is not difficult.

The simple way to fold is to bend the length by 2.
There is also a mechanism that reciprocates the edge with twice the stroke, but it is not suitable for high-speed movement. In addition, as a method of sandwiching the sheet between parent and child belts, there is a structure in which uneven parts are formed on the folded edges to prevent it from colliding with the flat belt pulley, but this creates wrinkles in the sheet and traps air, making post-processing difficult. There is a risk.

Figures 3 and 4 show a mechanism that is effective when folding two or more flexible polyethylene sheets A. When sheet A has already been folded in two and is folded again into four (Fig. 3), or when folded in multiple layers, the sheets are very slippery, but the metal edge 1 and sheet A
In this case, the difference in coefficient of friction is large, and only the inner sheet in contact with the edge causes displacement B due to static electricity, a vacuum state due to close contact, etc. Applying a slippery glass fiber sheet to the edge surface can somewhat solve the problem, but it is not permanent.

In the illustrated mechanism, an air nozzle 7 is installed near the tip of the edge (Fig. 4), and by injecting a small amount of air C, an air film D is formed between the edge and the sheet.
This creates a gap, making it easy to fold many stacked sheets at the same time. Of course, if there is a large amount of air, air will get trapped, but it is necessary to provide an air throttle valve in front of the air nozzle to adjust the amount of overlapping sheets and the pressure of the parent-child belt, and if necessary, use a rubber roller, etc. Experiments have confirmed that if more pressure is applied, work can continue without any problems.

FIG. 5b shows a mechanism for easily post-processing the soft polyethylene sheet that has been folded and transported by being wrapped around the parent-child flat belts 3, 4. Post-processing of folded and folded sheets is difficult if the sheets are not stacked properly (misalignment, alignment of edges, etc.).

In order to ensure that the sheet that has been folded there and transported approximately horizontally by the parent-child flat belts 3 and 4 always falls in a fixed place when it is discharged,
The downward angle at the time of discharge is between 1.5° and 10°. If the axial positions of the upper and lower pulleys at the terminal ends of the parent and child flat belts 3 and 4 are the same (Fig. 5a), there is a possibility that the pulleys may fly out in either the up or down direction due to changes in air flow. However, if the pulley upper shafts of the upper and lower pulleys 10, 11 at the sheet ejecting position protrude in the ejecting direction by more than half of the pulley diameter, the sheet can be prevented from flying upward (FIG. 5b).

Next, depending on the sheet feed length, number of stacked sheets, and belt speed, the sheet is ejected at a downward angle.
When discharged at an angle of 1.5° to 10°, the sheet will stop at the stopper.
Experiments have shown that the object falls stably along the guide, and it is possible to easily obtain an appropriate angle by moving the upper shaft of the pulley up and down. The mechanism configured in this manner is effective for post-processing sheets.

FIG. 6 shows an effective mechanism for transporting a large number of folded flexible polyethylene sheets using a parent-child flat belt. As soft polyethylene sheets become thinner, it becomes more difficult to manufacture them with a uniform thickness, and even the same sheet may be partially thick or thin. Therefore, when a large number of sheets are piled up and transported by a parent-child belt, the tension of the belt constantly changes. Also, if the number of stacked sheets changes, the belt needs to be adjusted each time.

Therefore, by combining an escape mechanism 8 on one side of the parent-child belt that can automatically adjust the change in belt tension that occurs when a seat is caught, it is possible to prevent belt damage (Figure 6). ,
The purpose can be achieved by using it on only one side of the parent-child belt.

If a product such as a nylon core is used for the transfer belt, there will be almost no expansion or contraction, and there will be no need for a tension device on the belt itself.If the number of stacked sheets is small, the elasticity of the belt will allow for smooth transfer. be. However, in many cases, the number of sheets to be stacked is 40 to 100 in the final process, and it is difficult to give the belt enough room in advance, even for extremely thin sheets. Moreover, since the belt is intermittently wound with overlapping sheets, the belt, which is constantly subjected to different pulsating tensions, can continue to rotate without coming off the pulley.

By combining the above mechanisms to form a bending and transporting device for flexible polyethylene sheets, not only can post-processing of sheets, which was conventionally done manually, be done quickly and uniformly, but also it is possible to process sheets one by one. It is also possible to take out sheets one by one, like tissue paper, if a packaging method is devised.

As explained above, the present invention has a cross section with a small angle
The parent-child flat belts 3 and 4 for winding and conveying are stretched in a letter shape and driven toward the bottom of the V-groove 9, and the straight blades parallel to the bottom of the V-groove 9 are connected to positions outside the V-groove 9 and inside the V-groove 9. The bending edge 1 is equipped with a bending edge 1 that can reciprocate between the intermediate position of
In the folding and transferring mechanism for a soft sheet, the sheet A is forcibly peeled off from the edge 1 by the pressurized air when the sheet A is folded into the V groove 9 by the blade of the bending edge 1 and transferred to the parent-child flat belts 3 and 4. , parent-child flat belts 3 and 4 driven substantially horizontally at a constant speed in a press-contact state.
In the sheet discharging section, the upper pulley 10 of the sheet discharging section is jutted out from the lower pulley 11 in the sheet discharging direction, and the vertical position of the upper pulley 10 is freely adjustable. Since the air nozzle 7 installed near the blade is configured to blow out pressurized air toward the blade, the contact area between the blade and the soft sheet A at the bending edge 1, where the surface pressure is greatest during bending, is By forcibly supplying pressurized air from the air nozzle 7 on the other side, an air film D (Fig. 4b) can be constantly formed between the two, and the soft sheet A can be bent into the V-groove 9 with the blade of the edge 1. When the sheet A is folded and transferred to the parent-child flat belts 3 and 4, the pressurized air allows the sheet A to be forcibly and smoothly peeled off from the edge 1. In this way, since the jetting direction of the air nozzle 7 is directed toward the blade of the bent edge 1, the air nozzle 7
The pressurized air blown out first peels off the soft sheet A from the part of the blade where the surface pressure is high, and then forms an air film D on both sides of the bending edge 1 behind the blade, making it the most difficult to peel off. Pressurized air forms an air film D on both sides of the bending edge sequentially from the blade portion, and the pressurized air is most effectively used to promote peeling. As a result, the amount of pressurized air supplied to the air nozzle 7 can be reduced, and a small-capacity air pump can be used, so that costs can be reduced. Even when the soft sheet A rapidly descends on both sides of the bending edge 1, the air film D plays the role of avoiding sliding contact between the two, thereby preventing scratches on the soft sheet A and improving the quality of the soft sheet A. It also has the advantage of being sustainable. The air film D prevents dust from entering between the soft sheets A on both sides bent at the bending edge 1, and can also keep the soft sheets clean by its cleaning action.

Furthermore, according to the present invention, the soft polyethylene sheet A is folded and transported by the parent and child belts 3 and 4.
When discharging the sheet, the overhang of the upper pulley in the sheet discharging direction can prevent the sheet from flying upward at irregular angles. Also, by adjusting the upper pulley up and down, an appropriate discharge angle can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing the main parts of a bending and transferring device for soft polyethylene sheets to which the present invention is applied, Fig. 2 is a longitudinal cross-sectional view of Fig. 1, Fig. 3 is an operational illustration, and Fig. The figure is a perspective view and a longitudinal cross-sectional view of separate parts.
The figure is a longitudinal sectional view of yet another part, and FIG. 6 is a longitudinal sectional view of still another part. 1...Bending edge, 3, 4...Parent-child flat belt, 9
...V groove, A...soft sheet, 10...upper pulley, 1
1...Lower pulley.

Claims (1)

[Scope of utility model registration request] A parent-child flat belt 3 for winding and conveyance that is stretched in a V-shape with a small angle cross section and driven toward the bottom side of the V groove 9;
4, a bending edge 1 in which a straight blade parallel to the bottom of the V-groove 9 can reciprocate between a position outside the V-groove 9 and an intermediate position within the V-groove 9, and a vicinity of the blade of the bending edge 1. and an air nozzle 7 that blows out pressurized air toward the blade, and when the soft sheet A is folded into the V groove 9 by the blade of the bending edge 1 and transferred to the parent-child flat belts 3 and 4, the pressurized air is used to remove the sheet A. In the folding and transporting mechanism for a soft sheet in which the soft sheet is forcibly peeled off from the edge 1, the upper pulley of the sheet discharging section is connected to the sheet discharging section of parent and child flat belts 3 and 4 that are driven substantially horizontally at a constant speed in a press-contact state. 10 is extended from the lower pulley 11 in the sheet ejection direction, and the upper pulley 1
A flexible sheet folding and transporting mechanism characterized in that the vertical position of 0 can be freely adjusted.