Electric heating – Metal heating – By arc
Reexamination Certificate
2000-03-29
2001-12-25
Heinrich, Samuel M. (Department: 1725)
Electric heating
Metal heating
By arc
C901S021000, C901S025000
Reexamination Certificate
active
06333487
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention
The present invention relates to a torch-angle setting device which is advantageously used together with a cutting device for carrying out the groove-angle Cutting of material being cut by gas cutting torch, plasma cutting torch or laser cutting torch.
2. Description of the Prior Art
In a field such as shipbuilding, bridge construction or building, there are many cases where a plurality of steel plates, each having a given size, are welded to each other in order to form a construction. When steel plates are welded to each other, the thicker the thickness of steel plates becomes, the more difficult it is to expect weld penetration uniform in the direction of thickness. Therefore, the groove angle is generally formed.
In particular, there are parts having an outer periphery formed of curved line in special parts used in shipbuilding, or bridge construction. In this case, it is needed to cut material being cut into a design having the periphery formed of a curved line, and, at the same time, to carry out groove-angle cutting. Further, even in other parts, there are cases where groove angle is needed to be prepared on a design having a curved or straight periphery.
The structure of a cutter for the groove-angle cutting of material being cut is explained hereinafter. When cutting material such as steel plates, a gas cutting torch, plasma cutting torch, or a laser cutting torch is selectively used in a general way. When a groove-angle cutting is carried out, a torch is inclined at the cutting angle, and this cutting angle is maintained until the objective groove-angle cutting is finished. Therefore, when material being cut is cut with a groove angle in a curved line, a torch-angle setting device is formed in such a manner that a torch can be turned so that the direction of the torch coincides with the curved line.
Further, a position as a standard of control in the case where cutting is made, is the intersection of the extension of line of a torch and material being cut, wherein a locus of the intersection coincides with an objective design. Accordingly, it is not a problem of utmost importance whether the intersection of the extension of the line of a torch and material being cut coincides with the intersection of the extension of the line of a turning shaft and material being cut, as a reference when turning the torch. Therefore, when a torch in which the two intersections do not coincide with each other, an offset system machining head is formed, and as a torch in which the two intersections coincide with each other, a zero offset system machining head is formed, and programs corresponding to the respective machining heads are provided.
As mechanisms for setting torch-angle, various mechanisms have been provided. However, when using a gas cutting torch or plasma cutting torch, the mechanism for setting the torch-angle is generally formed in such a manner that a torch can be set at a desired angle by mounting a torch holder for holding a torch on a carriage which moves along a fan-shaped guide, and moving the carriage by means of a motor. In this mechanism, the turning of a torch is carried out by turning the fan-shaped guide, wherein a zero offset system machining head can be realized by keeping the fan-shaped guide away from the turning shaft, and by aligning the torch with the turning shaft.
Further, in the case of a laser cutting torch, the torch is provided with a mechanism for inclining the torch at an objective inclined angle, and with a mechanism for aligning straight-passing laser beam with an inclined angle of the torch while reflecting the laser beam.
In case of using a laser cutting torch as a torch and setting the torch-angle thereby, there has been a problem when forming a zero offset system machining head, the structure thereof is complicated and large-scaled, because the mechanism for a reflecting laser beam is needed. Therefore, an offset system machining head has been generally formed. However, in this case, there is a problem in that the machining head lacks smoothness when turning a torch along a curved line in the objective design, so that a notch (groove, concave) is formed in a cut surface.
BRIEF SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a torch-angle setting device which is applied mainly for a cutting machine using a laser cutting torch and which facilitates smoothly making the groove-angle cutting. In order to solve the problem of the present invention, a torch-angle setting device according to the present invention comprises a turning shaft which is arranged perpendicular to material being cut, a first rotation shaft which is arranged at a right angle to the turning shaft and which has an end connected to the turning shaft, a second rotation shaft which is arranged parallel with the first rotation shaft, a first arm which is connected to the first rotation shaft and to the second rotation shaft, a second arm which has an end connected to the second rotation shaft, a driving means for rotating the first arm on the first rotation shaft and rotating the second arm, by an angle which is twice as great as the angle of rotation of the first arm, on the second rotation shaft in the opposite direction to the direction of rotation of the first arm, along with the rotation of the first rotation shaft, said second arm being substantially formed as a torch.
In the above-mentioned torch-angle setting device (hereinafter referred to as “angle setting device”), the first rotation shaft is arranged perpendicular to the turning shaft, an end of the first rotation shaft is connected to the turning shaft, the second rotation shaft is arranged parallel with the first rotation shaft, and these rotation shafts are connected through the first arm. Further, since along with the rotation of the first rotation shaft the second arm is rotated by an angle which is twice as great as the angle of rotation of the first arm, on the second rotation shaft in a direction opposite to the direction of rotation of the first arm, the angle made between the first arm and an extension line of the turning shaft equals the angle between the second arm and an extension line of the turning shaft, as seen from the direction of an extension line of each of the rotation shafts. The intersection of the extension line of the turning shaft and the extension line of the second arm is positioned on the turning shaft.
Accordingly, in the case where the second arm is substantially formed as a torch, the torch can be set at the same angle as that of the first angle, by setting the first angle to the extension line of the turning shaft at a desired angle.
In the angle setting device, it is preferable that the driving means is comprised of a first fixed member which is fixed to the first rotation shaft and has a preset diameter, a second fixed member which is fixed to the second arm which is arranged on the extension line of the second rotation shaft and has approximately a diameter of ½ of the diameter of the first fixed member, and a transmitting member connected with the first fixed member and with the second fixed member, and a rotating member which rotates the first rotation shaft or the second arm.
In the above-mentioned angle setting device, when the first arm (or the second arm) is rotated by means of the rotating member, this rotation is transmitted to the second fixed member through the first fixed member and the transmitting member. In this time, since the ratio of the diameter of the first fixed member to that of the second fixed member is set at 2:1, the second arm is rotated by angle which is twice as great as that of the first arm.
As the above-mentioned individual fixed member, toothed pulleys or sprocket wheels can be used. As the transmitting member, a middle gear, a toothed belt or a chain are preferably used. By selecting the fixed member and the transmitting member from among the above-mentioned parts, a secure drive without slippage can be realized.
However, if slippage is not subs
Heinrich Samuel M.
Koike Sanso Kogyo Co. Ltd.
Townsend & Banta
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