JPS625759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting device for plastic bodies used not only in industries that handle plastic bodies, such as the ceramic industry and the inorganic chemical industry, but also in the explosives industry, food industry, and the like.

Conventionally, saw blades such as band saws and scroll saws have been most commonly used to cut solid objects, but since saw blades do not work effectively when cutting plastic objects, other types of saw blades have been used in addition to kitchen knives. Cutting is done using piano wire and wire rods. For example, molded clay tiles,
Foamed concrete such as ALC is cut by pressing a string or frame stretched with piano wire against a plastic material.

This cutting method has the advantage that the cutting machine can be mechanically very simple, but the dimensional accuracy of the cut object is inferior, and from an industrial perspective, a faster cutting speed is desirable, and thick piano wire is required for cutting. The disadvantage was that only a cut surface with poor smoothness could be obtained.

On the other hand, cutting is also carried out by frequently reciprocating a string or frame on which piano wire is stretched using rotational force and pressing the piano wire against a plastic object.

Even with this cutting method, the piano wire stops moving at the moment it changes from side to side, resulting in a wavy pattern on the cut surface, which impairs its smoothness.

The present invention was made in order to solve the above-mentioned conventional problems, and an object of the present invention is to enable precise and smooth cutting of a plastic body with a piano wire.

An embodiment of the present invention will be described below with reference to the drawings.

On the machine foundation 1, a winding drum 2 and a rewinding drum 2' with a brake device, which can be rotated by drive devices 6 to 9 to be described later, are arranged facing each other with a mounting table 3 in between.
They are supported by bearings 4 and 4', respectively.

Piano guide mechanisms 10 and 10', which will be described later, are provided on the mounting table 3 side of the winding drum 2 and the unwinding drum 2', respectively, and the position where the piano wire 5 crosses the mounting table 3 via the guide mechanism is provided. One or more piano wires 5 (in this embodiment, one wire) is suspended under tension between the winding drum 2 and the rewinding drum 2', with .

A sprocket 7 is attached to the output shaft of a motor 6 installed near the winding drum 2, and a sprocket is attached to the drum shaft of the winding drum 2.
A chain 9 is stretched between both sprockets 7 and 8, and the winding drum 2 is rotated in the piano wire winding direction by driving the motor 6.

The piano guide mechanism 10, 10' is provided with a play sheave 11 on the drum side and a positioning guide ring 12 on the mounting table 4 side.
Therefore, the piano wire 5 is stretched at a constant position regardless of fluctuations in the winding position and unwinding position on the drum.

The mounting table 3 is a parallel crank mechanism 1 which will be described later.
It is installed on the machine foundation 1 so as to be able to be raised and lowered by a hydraulic cylinder device 19 via the platform 3, and the piano wire 5, which is tensioned at a fixed position, is placed in the upper part of the platform and retracted from the surface. Multiple grooves 1
4 are arranged in parallel.

The parallel crank mechanism 13 has two sets of links 16 and 16' rotatably attached to a connecting shaft 15 in an X shape, and the lower end of the link 16 of each link set and the link 1
The upper ends of the links 6' are fixedly and rotatably connected to the fixed base 17 and the mounting table 3, respectively, and the upper ends of the links 16 and the lower ends of the links 16' are connected to the fixed base 17 and the mounting table 3, respectively, with rollers 18, 18'. The mounting table 3 is moved up and down smoothly by the operation of the mechanism 13 by a hydraulic cylinder device 19 installed on the machine foundation 1.

Next, the effect will be explained.

When the winding drum 2 is driven by the motor 6, since the unwinding drum 2' is braked, the piano wire 5
Since the piano wire 5 is held under tension between the piano wire guide mechanisms 10 and 10' and continuously travels in the winding direction at a certain position on the mounting table 3, the piano wire 5 is
Under a predetermined tension that overcomes the cutting resistance of the upper plastic body M, the mounting table 3 is moved at a speed of, for example, 4 to 50 meters per minute, and the parallel crank mechanism 13 is actuated by the hydraulic cylinder device 19 to raise the mounting table 3. , the plastic body M on the mounting table 3 is smoothly pressed against the piano wire 5 which runs continuously in the winding direction at a certain position, and the piano wire 5 allows the plastic body M on the mounting table 3 to be pressed at a precise position from above. The cutting results in a smooth cutting surface with good precision, for example a surface condition comparable to troweling in architectural plastering.
Particularly in the case of ALC and ceramic products, the ability to obtain a smooth cut surface with good dimensional accuracy without the post-process of surface polishing and surface grinding brings the following advantages. That is, a plurality of piano wires 5 are connected to the drums 2, 2'.
Multiple boards can be obtained by using them to cut the plastic body M by stretching them at equal pitches between them, but especially when the ALC boards obtained in this way are used as exterior wall boards for buildings, the surface coating may be thin. It can be done by painting. In addition, since there is no variation in the dimensions of the boards and the dimensional accuracy is good, it is possible to assemble a house that fits well with ALC boards.

The cutting of the plastic body M is completed when the piano wire 5 enters the groove 14 on the upper part of the mounting table 3. Piano wire after cutting 5
, and the cut plastic body is carried out from the mounting table 3.

In this embodiment, the piano wire 5 is run in the winding direction between the winding drum 2 and the unwinding drum 2'. , and the drum 2 is provided with a brake device similar to that of the drum 2', and a switching mechanism is provided to change the role of the drums 2, 2' so that cutting can be performed even during the winding operation of the drum 2', and (2) ′→
If a changeover switch is provided to operate the switching mechanism so that the switching between the forward rotation (2) and the reverse rotation (2→2') can be performed at intervals of the end of cutting the plastic body M, it will be possible to switch between the forward rotation (2) and the reverse rotation (2→2') for the next cutting. There is no need to reverse the rewinding drum 2' to rewind the piano wire 5, and cutting can be started immediately, improving the efficiency of the cutting operation. In this case, the brake device may in principle be one normally used for motorcycles and automobiles, but it should be set to operate in synchronization with the switching cycle between forward and reverse rotation using hydraulic or pneumatic pressure. .

As described above, in the present invention, while the piano wire is suspended under tension between drums and continuously runs in the winding direction,
This is a plastic material cutting device that presses the plastic material against the piano wire to cut it, and uses a cylinder device to smoothly raise the mounting table against the piano wire at a speed that corresponds to the traveling speed of the piano wire. Therefore, the plastic material on the mounting table can be efficiently cut, and the piano wire can be cut with less wobbling and a smooth cutting surface with high precision can be obtained. Moreover, the equipment is simple and compact, and the equipment cost is low.

[Brief explanation of the drawing]

1 and 2 are a front view and a plan view showing one embodiment of the present invention, and FIG. 3 is a perspective view of a piano wire guide mechanism. 2... Winding drum, 2'... Rewinding drum, 3...
...Placement stand, 4,4'...Bearing, 5...Piano wire,
6...Motor, 7,8...Sprocket, 9...
Chain, 10, 10'... Piano wire guide mechanism, 11... Play sheave, 12... Guide ring, 13... Parallel crank mechanism, 14... Groove, 1
9...Hydraulic cylinder device.

Claims (1)

[Claims] 1. A drivable winding drum and a rewinding drum with a brake device are arranged opposite to each other with a mounting table in between, and one or more piano wires are suspended under tension between the winding drum and the rewinding drum. . A plastic material cutting device, characterized in that the mounting table is provided so as to be movable up and down relative to the piano wire by a cylinder device via a parallel crank mechanism.