JPH0611158Y2 - Extruded sheet cutting device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cutting an extruded continuous thermoplastic resin sheet into a predetermined size.

2. Description of the Related Art A conventional cutting device is shown in a drawing (first example) of an embodiment according to the present invention.
It will be described with reference to FIG.

The continuous extruded sheet 1 is taken by a take-up machine 2 and guided onto a cutting table 3. Cutting table 3
Has a fixed blade 4 attached to its front end face, and is provided with a movable blade that moves up and down in cooperation with this. Each time the sheet 1 is fed by a predetermined size, the moving blade 5 moves up and down to cut the sheet 1, and the cut sheet is conveyed further forward by the conveyor 6. A sheet of fluororesin or the like is attached to the upper surface of the cutting table 3 so that the sheet 1 to be introduced is slippery.

In the above cutting device, the upper surface of the cutting table is slippery, but at the fixed blade attached to the front end face of the cutting table, the lower surface of the sheet eventually slides against the fixed blade. And the sheet is easily scratched. It is conceivable that a roll is installed in the transition part from the cutting position to the conveyor, and the sheet is slightly floated from the fixed blade by this roll, but since the tip of the moving blade that moves up and down enters this transition part, It is difficult to secure a space to install the roll.

An object of the present invention is to provide a cutting device for an extruded sheet that prevents the occurrence of scratches on the sheet due to contact with the fixed blade of the cutting table. Furthermore, non-slip or non-rigid sheets (low density polyethylene, EVA,
It is an object of the present invention to provide a device capable of performing a cutting operation without causing wrinkles and scratches on the cutting table that has been sent even with EEA or the like).

Means for Solving the Problems In order to achieve the above object, the present invention hangs a support roll 8 for a sheet 1 having a shaft in the width direction of the movable blade 5 on a support 7 that holds the movable blade 5. Fix it. In this fixing, when the movable blade 5 is located above, the upper peripheral surface of the support roll 8 is
It is performed so that it is located below the movable blade 5 and above the upper end of the fixed blade 4.

Further, behind the cutting table 3, an air nozzle 9 is installed below the sheet 1 and oriented in the sheet feeding direction.

Action In the above apparatus, when the movable blade 5 is located above, the sheet 1 being fed is placed on the support roll 8 and further fed forward, and floats from the fixed blade 4. When the movable blade 5 descends and cuts the sheet 1, the support roll 8 also descends at the same time to create a space into which the movable blade 5 enters. The floating sheet 1 comes into contact with the fixed blade 4, and the fixed blade 4 and the movable blade 5 cooperate to cut the sheet. When the movable blade 5 is lifted after cutting, the leading edge of the rear sheet 1 is fed and is placed on the support roll 8, and the lower surface of the sheet 1 is separated from the fixed blade 4.

Further, the air is blown out from the air nozzle 9 behind the cutting table 3, so that the sheet 1 floats up, and the contact resistance with the upper surface of the cutting table 3 is reduced. Further, since the blowing direction is the feeding direction of the sheet 1, the feeding is promoted.

Embodiments Embodiments of the present invention will be described below.

Since the movable blade 5 is normally moved up and down by the crankshaft, it moves not only up and down but also back and forth. Since it is not possible to install a roll that normally holds a sheet in such a space, the support roll 8 is suspended and fixed to the support 7 that holds the movable blade 5, and the support roll 8 is lowered as the movable blade 5 descends.
Is also going to descend.

If it is necessary to support the sheet even at the portion extending from the support roll 8 to the conveyor 6, an auxiliary roll 10 is installed to further prevent the sheet from being scratched. In the initial stage of extrusion molding, there is a portion that does not become a product until the molding conditions become stable. Since this is cut into short pieces for reuse, it is convenient that the auxiliary roll 10 can be lowered by the air cylinder 11 and the short cut sheets are dropped.

To prevent the sheet 1 introduced on the cutting table 3 from wrinkling due to the contact resistance with the upper surface of the table, and to prevent scratches due to contact with the table when it is a soft sheet,
Behind the cutting table 3, an air nozzle 9 is installed below the sheet 1 and oriented in the sheet feeding direction. Air nozzle 9
Are installed in the width direction of the sheet 1. A service tank 13 is connected to the ring blower 12 to stabilize the air volume. Further, each nozzle 9 is provided with a valve 14 so that the air volume can be adjusted depending on the type of seat.

Although the air nozzle 9 is installed below the sheet 1, an auxiliary roll 15 may be provided near the air nozzle 9 in order to prevent the sheet 1 from coming into contact with the air nozzle 9. Auxiliary roll 15
If the sheet 1 is slightly floated by the above and a gap is formed between the sheet 1 and the cutting table 3, the sheet 1 can be more effectively floated and fed by blowing air.

Effect of the Invention As described above, in the cutting device according to the present invention, the sheet can be placed on the support roll and fed when the cutting operation is not performed, preventing contact with the fixed blade on the lower surface of the sheet and causing scratches. Can be prevented.

Furthermore, if an air nozzle is installed, the contact resistance between the upper surface of the cutting table and the lower surface of the sheet is reduced, and the air blowing direction is made to coincide with the sheet feeding direction to promote the sheet feeding. Instead, it can be introduced into the cutting table without causing scratches even on a soft sheet.

[Brief description of drawings]

FIG. 1 is an explanatory side view showing an embodiment of a cutting device according to the present invention, and FIG. 2 is an enlarged view of part A of FIG. 1 is a sheet, 3 is a cutting table, 4 is a fixed blade, 5 is a movable blade, 7 is a support, 8 is a support roll, and 9 is an air nozzle.

Claims (2)

[Scope of utility model registration request] 1. An apparatus for guiding a continuous extruded thermoplastic resin sheet to a cutting table, and cutting the sheet into a predetermined size by a fixed blade attached to the cutting table and a moving blade that moves up and down, wherein the moving blade is held. A support roll of a sheet having an axis in the blade width direction of the movable blade is suspended and fixed to the support, and the upper peripheral surface of the support roll in a state in which the movable blade is above the upper edge of the fixed blade. An extruded sheet cutting device configured to be positioned. 2. An air nozzle, which is located below the sheet and faces the sheet feeding direction, is installed behind the cutting table.
Extruded sheet cutting device described