JPS5820505Y2 - Tube net cutting device - Google Patents

Description

[Detailed description of the invention] This invention is a device that cuts open a tube-shaped plastic net used for packaging, etc., and makes it into a sheet-shaped net.

Plastic nets used for packaging goods are made into long tubes during the manufacturing process.This tube net is set in a packaging machine as a take-up roll, the goods are placed inside the tube net, and both ends of the tube net are rolled. The net packaging is completed by tying the pieces together and tying them together with string or wire.

Since plastic nets in sheet form are not commercially available, tube nets cannot be used in automatic packaging machines that use sheet films.

In order to wrap an article in a pillow-type manner using a plastic net (hereinafter referred to as a net), it is first necessary to obtain a sheet-like net.

Therefore, this invention provides an apparatus for cutting open tube nets and making sheet-like nets.

Tube net has different properties from sheet film for automatic packaging machines, as it is a hard material, and has the disadvantage that it stretches when pulled, reducing the diameter of the net. It is very difficult to cut open.

This devised device uses a cylinder to spread the tube net evenly, passes the tube net through the cylinder, continuously moves it so that it is tensioned to some extent on average, and cuts it with a fixed blade along the guide plate. It is designed to be rolled up in the form of a sheet, and by using this invented device, it is possible to cut it open and obtain a sheet net of a predetermined width while preventing the net from elongating.

In this device, a front guide plate is installed vertically at the front of a cylinder that is equal to the diameter of the tube net, and a rear guide plate with a flared shape is installed horizontally at the rear of the cylinder, and a groove is formed in a part of the cylinder. It has a structure in which a cutting blade is inserted into the groove, and a pair of feed belts are disposed on both sides of the cylinder.An example of the structure will be explained with reference to the drawings.

FIG. 1 is a side view showing the outline of this device, FIG. 2 is a plan view, and FIG. 3 is a perspective view of the main parts of this mechanism.

First, in FIG. 3, the width of the tip is about the same as the width of the flattened net at the front part of the cylinder 4 whose size is equal to the diameter of the expanded tube net, and the width of the tip is about the same as the width of the flat net as shown in the figure. A front guide plate 3 whose width is gradually narrowed to be the same as the diameter of the cylinder 4 is installed in the vertical direction, and a rear guide plate 6 with a shape that widens toward the end is installed in the horizontal direction at the rear. A groove 5' into which the cutting blade 5 is inserted is formed in a part of the upper surface.
will be established.

In the figure, the cutting blade 5 is shown separated from the groove 5', but when in use, the blade is placed in the groove 5' and the arm holding the blade is fixed.

Reference numeral 18 indicated by a dotted line is an arm that holds the cylinder 4.

Next, the structure and operation of this devised device will be explained with reference to FIGS. 1 and 2. A take-up roll 1 on which a tube net is flattened and wound is attached to a freely rotating holder, and the tube net 1 is taken out from there. ' is placed between the two guide rolls 2, 2, and the front guide plate 3 that approaches is placed into the tube net 1', so that the net 1' is connected to the cylinder 4.
The tube net 1' is continuously advanced in the direction of the arrow by a pair of endless feed belts 7, 7 provided on both sides of the cylinder 4.

The tube net 1' is cut open by the cutting blade 5 inserted and fixed in the groove 5' in the upper part of the cylinder 4, and gradually becomes a sheet shape along the rear guide plate 6 to form the net 11.

The lower surface of the sheet net 11 is supported by a rotary roll 8, and is wound onto a winding bobbin via each guide roll 9 and a tension roll 10 to form a sheet net winding reroll 11'.

The rear guide plate 6 is installed at a slight inclination so that the widening end is slightly lower than the mounting part of the cylinder 4, and the rotating roll 8 is installed so that the rotation is transmitted by the drive roll 12 and the belt 16. Although not shown, it has a structure in which rotation is transmitted from a transmission device on the machine base, similar to the pair of feed belts 7, 7.

A tube sprocket 13 is attached to the bobbin end of the sheet net take-up roll 11', and rotation is transmitted to a chain sprocket 14 attached to the rotating shaft of a transmission 15 below through a chain 17.

This is because the tube net 1' is continuously advanced by a pair of feed belts 7, 7, cut open by the cutting blade 5, and a large load (tensile resistance, etc.) is applied to the sheet net 11 when it is cut into a sheet and then wound onto a winding bobbin. If this happens, the net will stretch and the sheet width will shrink, making it impossible to obtain a sheet net of a predetermined width.

To prevent this, the sheet net 11 must be wound onto a winding bobbin without applying any load.

As the diameter of the sheet net winding roll 11' gradually increases during the winding process, the rotation of the winding bobbin is also changed.

As explained above, the tube net 1' is introduced through the opening of the cylinder 4 having the front guide plate 3 and the rear guide plate 6, and the tube net 1' is continuously conveyed by the pair of feed belts 7.7 provided on both sides of the cylinder 4. As the tube net 1' moves forward, it is cut open by the cutting blade 5 provided at the top of the cylinder 4 to form the sheet net 11, and the tube net cutting device winds up the sheet net 11 by adjusting the rotation of the winding bobbin. This makes it possible to efficiently obtain a sheet net.

[Brief explanation of the drawing]

FIG. 1 is a side view of this device, FIG. 2 is a plan view, and FIG. 3 is a perspective view of the main parts. 1'...Tube net, 3...Front guide plate, 4...Cylinder, 5...Cutting blade, 5'... Groove, 6... Rear guide plate.

Claims (1)

[Scope of utility model registration request] A front guide plate is installed vertically at the front of the cylinder, which is equal to the diameter of the tube net, and a rear guide plate with a shape that widens toward the end is installed horizontally at the rear.A groove is provided in a part of the cylinder, and a cutting blade is installed in the groove. A tube net cutting device consisting of a pair of feeding belts on both sides of a cylinder.