Turning – Lathe – Headstock
Reexamination Certificate
1999-06-29
2001-02-06
Tsai, Henry (Department: 3722)
Turning
Lathe
Headstock
C082S145000, C082S147000
Reexamination Certificate
active
06182544
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a stepless cutter feeding mechanism for a lathe to cut a workpiece at a constant linear cutting speed to thereby provide a product of good quality.
2. Description of the Related Art
A typical lathe for cutting, a workpiece (e.g., a shaft) generally includes a cutter feeding device that feeds a cutter transversely to process the shaft. It is known to keep the linear cutting speed during cutting of the workpiece so as to obtain a product of good quality.
FIG. 8
of the drawings illustrates a typical cutting of a shaft
50
by a cutter
60
that is transversely fed at a constant speed. The linear cutting speed (the peripheral displacement per minute of the cutter along a circumference of the workpiece) is V1 when the shaft
50
is rotated through an angle &THgr;. Nevertheless, referring to
FIG. 9
, when the diameter D of the shaft
50
becomes smaller as a result of cutting, the linear cutting speed V2 is smaller than V1. Thus, the linear cutting speed for the shaft
50
is not constant such that the resultant shaft
50
has a poor quality.
The present invention is intended to provide a buckle device that mitigates and/or obviate the above problem.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a stepless cutter feeding mechanism for a lathe to cut a workpiece at a constant linear cutting speed to thereby provide a product of good quality.
The rotating speed of the workpiece to be processed and the speed of the cutter are both increased when the diameter of the workpiece becomes smaller, thereby keeping the linear cutting speed at a constant value.
In accordance with the present invention, a lathe is provided with a stepless cutter feeding mechanism for cutting a workpiece at a constant linear cutting speed. The lathe includes a cutter seat that carries a cutter for cutting the workpiece and a motor for driving a main shaft that carries the workpiece. The stepless cutter feeding mechanism comprises a speed sensing means connected to the cutter for sensing linear cutting speed of the cutter. A governor device is connected to the speed sensing means and electrically connected to the motor for changing rotational speed of the motor in response to a linear cutter feeding speed of the cutter such that the cutter cuts the workpiece at a constant linear cutting speed.
The lathe includes a transverse feeding shaft to which the cutter seat is mounted for feeding the cutter along a transverse direction. In an embodiment of the invention, the speed sensing means includes a worm and a worm gear meshed with the worm. The worm is meshed with the transverse feeding shaft and the worm gear is connected to the governor device. The worm includes an axial receptacle. A screw is securely mounted in the axial receptacle to move therewith and meshes with the transverse feeding shaft. The governor device includes a governor coaxially mounted with the worm gear and a resistor means connected between the governor and the motor. The resistor means changes rotational speed of the motor in response to the change in the linear cutting speed of the cutter.
The lathe further comprises a switch device that includes a manual mode and an automatic mode thereby allowing adjustment in rotational speed of the main shaft by means of manual operation and by automatic operation under control of the governor device.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 2600988 (1952-06-01), Greene et al.
patent: 2897427 (1959-07-01), Bradburn, Jr.
patent: 3008071 (1961-11-01), Karger
patent: 3543615 (1970-12-01), Cudnohufsky
patent: 3976861 (1976-08-01), Edwards et al.
patent: 4274315 (1981-06-01), Varner
patent: 2924890 (1980-01-01), None
Rosenberg , Klein & Lee
Tsai Henry
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