JPS632756B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a foam sheet cutting device, more specifically, a foam sheet cutting device that can continuously cut rigid or semi-rigid synthetic resin foam sheets at high speed and with high precision. The present invention relates to a sheet cutting device.

In recent years, rigid or semi-rigid synthetic resin foam sheets have been widely used in a wide range of industrial fields. For example, a hard polyurethane foam base material coated with a thin metal plate, various plastic sheets, kraft paper, etc. is used as a flame insulating material.

However, since such foam sheets are manufactured continuously as long plate-like bodies, they must be cut into desired lengths. This cutting can be done at high speed in terms of manufacturing efficiency, which is natural given the use of this type of foam sheet, but also because many standardized products are used, so the cut surface is sharp and sharp. It is required to be able to achieve uniformity and high precision.

Conventionally, a typical cutting device for such cases is one in which a rotary cutting blade supported at a right angle to the foam sheet is cut in the same direction and at the same speed as the transport direction of the foam sheet. There are things that cut while moving.

However, while such conventional cutting devices are suitable for cutting, for example, pipes or plates made of vinyl chloride, they are not suitable for cutting elastic foam sheets with relatively large thicknesses and long widths. It has the following drawbacks:

● A corresponding amount of time is required for the rotating cutting blade to cut a foam sheet having a long width from one end surface to the other end surface. As a result, variations in cutting length occur due to the discrepancy between the transport speed of the foam sheet and the moving speed of the rotating cutting blade during cutting, and the manufacturing speed including cutting is limited by the time required for cutting. It is slow and production efficiency is poor.

● Since the foam sheet is thick and elastic, it is difficult to obtain a sharp and uniform cut surface with a rotating cutting blade.

● When cutting a foam sheet with a rotating cutting blade, chips from the foam sheet are scattered as the rotating cutting blade rotates, creating a poor working environment.

● When cutting, the rotating cutting blade moves in the same direction and at the same speed as the foam sheet, and when cutting is completed, the rotating cutting blade moves the same distance to its original position, and this operation is repeated from now on. This is done by repeatedly rotating the driving part that moves the rotary cutting blade forward and reverse. Mechanically speaking, it is not a good idea to constantly repeat such operations, and there are many failures due to the scattering of the chips, resulting in poor durability.

The present invention provides an improved foam sheet cutting device that eliminates the drawbacks of such conventional cutting devices, and the object thereof is to be able to cut foam sheets at high speed and with high precision. That is,
Another objective is to obtain a sharp and uniform cutting surface, another objective is to avoid scattering of chips, and still other objectives are particularly related to the mechanism of the drive part. The goal is to make it durable.

Therefore, the present invention achieves these objects by: (a) a pair of endless chains disposed in parallel to engage with a sprocket; (b) a pedestal mounted on the endless chains; and (c) a pedestal mounted on the pedestal. A vertically installed approximately rectangular cutting blade (d) A pair of positioning pieces (e) attached to the pedestal via a buffer member so as to sandwich the cutting blade; separately supported to hold the pedestal in a predetermined position. Movable member that presses with Although it is attached,
Preferred embodiments include those in which the cutting edge is a so-called saw blade, the buffer member is a spring, the movable member has a built-in crank mechanism, and similar modifications thereof.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated in detail based on drawing which shows an Example.

The cutting device 1 is shown in a first diagram, which is a schematic perspective view of the entire cutting device.
As shown in the figure, it is interposed at an upper position in the conveying portion of the foam sheet A that is continuously produced. This cutting device 1 includes driving sprockets 21, 22 and floating sprockets 23, 2.
A cutting member 4 consisting of a mount, a cutting blade, a buffer member, and a positioning piece as described later is attached to a pair of endless chains 31 and 32 that are arranged in parallel and engaged with each other. Point B indicated by the dotted line in the figure where member 4 faces foam sheet A
A movable member 5, which will be described later, is separately supported.

As shown in FIG. 2, which is an enlarged side view of main parts, the cutting member 4 includes a pair of endless chains 31 and 32.
A mount 6 is mounted on the mount 6, and a substantially rectangular cutting blade 7 is suspended from the mount 6, and a pair of positioning pieces 9 are attached via a buffer member 8 so as to sandwich the cutting blade 7. ing. In this embodiment, a spring is used as the buffer member 8, but it is not limited to this, as any elastic body with restoring force and capable of supporting the positioning piece 9 may be used.

On the other hand, in the movable member 5, an idler sprocket 53 is connected to a drive sprocket 51 including a clutch mechanism via an endless chain 52, and a pressing piece 55 is supported by the idler sprocket 53 via a crank rod 54. . In this embodiment, a movable member 5 having a built-in crank mechanism as described above is used, but the pressing piece 55
It is not limited to this as long as it can be moved up and down a certain distance as necessary.

A pair of endless chains 3 whose opposing parts move in the same direction as the foam sheet A conveyed on the rectangular bar conveyor C and move at the same speed at least when cutting.
By detecting the cutting member 4 attached to the drive sprockets 21 and 2,
The clutch mechanism of the drive sprocket 51, which is connected to the chain 52 or driven by its own drive means, is energized, and the endless chain 52, the floating sprocket 53
The pressing piece 55 is pushed down via the crank rod 54, and at this point, the cutting member 4 located directly below the pressing piece 55 is pushed down. As a result, while receiving the assistance of the pair of positioning pieces 9 that come into contact with the foam sheet A,
The cutting blade 7 cuts the foam sheet A.

Therefore, it is necessary that the pair of endless chains 31 and 32 be provided with play corresponding to the vertical movement of the pressing piece 55. This play may be added to the pair of endless chains 31, 32 themselves, but the drive sprockets 21, 22 and the floating sprockets 23, 24 can absorb this play by using the swingable pair of tension sprockets.
Alternatively, the sprockets 23 and 24 may be supported by a spring so as to be horizontally expandable and retractable by bearing the floating sprockets 23 and 24.

Next, the structure of the present invention, including the relationships among the cutting member 4, movable member 5, foam sheet A, etc. explained above, will be explained in more detail based on FIG. 3, which is a sectional view of the main parts of another embodiment. explain.

The movable member 5 consists of an air cylinder 56 and a pressing piece 55 attached to the tip of a piston rod 57 of the air cylinder 56.

On the other hand, the cutting member 4 includes a pair of endless chains 31,
A mount 6 mounted on the mount 32, a substantially rectangular cutting blade 7 vertically disposed on the mount 6, and a spring attached to the mount 6 via a spring serving as a buffer member 8 so as to sandwich the cutting blade 7. It consists of a pair of positioning pieces 9. The cutting blade 7 in this embodiment is inserted into and screwed to a cutting blade stopper piece 71 screwed to the pedestal 6, and its base end is in contact with the pedestal 6, making it easy to It is possible to replace it. In addition, a separately supported contact piece 72 and a leaf spring 73 screwed to the frame 6 provide a certain kind of elasticity to prevent the cutting blade 7 from swinging laterally during movement and cutting. It is installed vertically.

When the cutting member 4 is detected in advance, the cutting device 1
is in a state of disconnection. That is, the pair of endless chains 31 and 32 are moved in the same direction and at the same speed as the foam sheet A.
moves. When only a certain cutting length is to be targeted, the opposing parts of the pair of endless chains 31 and 32 to which a plurality of sets of cutting members 4 are attached are always spaced at the same intervals as the cutting length. It suffices if it moves in the same direction and at the same speed as the foam sheet A. However, if the cutting length is applied to several types or if a certain specific cutting length is required, this method is unsuitable as it is. In such a case, at a position before the predetermined cutting position, the pair of endless chains 31,
32, and after a predetermined time delay using a timer, counter, etc., the pair of endless chains 31 and 32 are moved again, and then the cutting mode as described above is entered. In this way, any desired cutting length can be accommodated by setting the above-mentioned predetermined time delay, and the number of sets of cutting members 4 attached to the pair of endless chains 31 and 32 can be reduced. The cutting device can be made small and lightweight as a whole.

The cutting member 4 is ready for cutting as described above.
Although the foam sheet A and the foam sheet A are in a relatively stationary relationship, the movable member 5 moves at a predetermined position and the pressing piece 55 pushes down the pedestal 6. At the beginning of cutting, the pair of positioning pieces 9 come into contact with the foam sheet A, then the spring used as the buffer member 8 is compressed, and finally the cutting blade 7 cuts the foam sheet A. At this time, the cutting blade 7 is
Due to the cutting blade retaining piece 71, the contact piece 72, the leaf spring 73, and the pair of positioning pieces 9, it is in an extremely stable state and is in a stationary relationship with the foam sheet A.
Therefore, sharp and uniform cuts can be made instantaneously.

Preferably, since a certain conveying force is originally applied to the foam sheet A in the previous and subsequent steps, the conveyor in the corresponding part of the cutting device 1 only needs to act as an intermediate conveyor.
By configuring the conveyor in the relevant part of the cutting device 1 by a floating roller D, and by providing a pair of receiving pieces E at a predetermined position where the cutting blade 7 cuts, even more stable cutting can be achieved. In addition, in order to more safely prevent the foam sheet A from bouncing back during cutting, the foam sheet A can be held down by a pair of guide rollers F, and the cutting blade 7 is not a so-called flat blade but a saw blade. By doing so, it is also possible to distribute the force particularly at the time of cutting.

As explained above, the present invention has the following effects.

(1) The cutting blade, which is in a relatively stationary relationship with the foam sheet, cuts instantly by pressure;
There is almost no time required for cutting, so cutting can be performed with high accuracy and high speed.

(2) Since it cuts instantly by pressing,
A sharp and uniform cut surface can be obtained.

(3) Since it cuts instantly by pressing,
There is no scattering of chips and the work environment is good.

(4) Since it rotates only in the same direction, it is mechanically easy, has fewer failures, and is highly durable.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic perspective view showing one embodiment of the present invention, Fig. 2 is a partially enlarged side view thereof, and Fig. 3 is a partially enlarged sectional view showing another embodiment of the present invention. be. DESCRIPTION OF SYMBOLS 1... Cutting device, 4... Cutting member, 5... Movable member, 6... Frame, 7... Cutting blade, 8... Buffer member, 9... Positioning piece, 21, 22... Drive sprocket, 23 , 24... floating sprocket, 3
1, 32... Endless chain, 55... Pressing piece.

Claims (1)

[Claims] 1. A pair of endless chains that are arranged in parallel and engaged with sprockets with play added to them, a plurality of sets of cutting members attached to the endless chains, and a frame for the cutting members set at a predetermined position. Each of the cutting members includes a pedestal mounted on an endless chain, a substantially rectangular cutting blade suspended from the pedestal, and a movable member that holds the cutting blade from both sides so that it can be pressed horizontally. and a pair of positioning pieces attached to the stand via a buffer member to prevent vibration, and the foam sheet is continuously conveyed in the downward direction of the positioning pieces, and the foam sheet is conveyed in the direction of conveyance of the foam sheet. The cutting blade, which moves in the same direction and at the same speed as the conveyance speed at least during cutting, is pushed down through the pedestal by the pressure of the movable member at the predetermined position with the aid of the positioning piece, and cuts. A foam sheet cutting device designed to 2. The foam sheet cutting device according to claim 1, wherein the cutting blade is a so-called saw blade. 3. The foam sheet cutting device according to claim 1, wherein the buffer member is a spring. 4. The foam sheet cutting device according to claim 1, wherein the movable member has a built-in crank mechanism.