Turning – Lathe
Reexamination Certificate
2000-05-19
2001-10-09
Tsai, Henry (Department: 3722)
Turning
Lathe
C082S118000, C082S121000, C082S137000
Reexamination Certificate
active
06298758
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a lathe, more particularly to a lathe, which is provided with a polygon machining device that is used to machine a workpiece, such as a nut or a headed bolt.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional polygon machining device
10
is shown to include a machine body
11
, a right gear box
12
, a rail member
13
, a cutter carrying plate
14
, a left gear box
15
, three cutters
16
(see FIG.
2
), and a universal connecting rod
17
. A spindle
121
and a driving shaft
122
are journalled on the machine body
11
. A chuck
123
is mounted on an end of the spindle
121
for holding a workpiece
18
(see
FIG. 2
) to be machined. A cutter shaft
151
is driven by the left gear box
15
. A driven shaft
152
is driven by the universal connecting rod
17
, and is connected operably to the left gear box
15
. The cutters
16
are fixed on a cutter mounting disc
153
, which is connected fixedly on the cutter shaft
151
. When the spindle
123
rotates, it activates the driving shaft
122
via the right gear box
12
, thereby rotating the cutter shaft
151
, the cutter mounting disc
153
and the cutters
16
through a transmission line of the universal connecting rod
17
, the driven shaft
152
and the left gear box
15
. The aforesaid device
10
suffers from the following disadvantages:
(1) When the position of the cutter carrying plate
14
is adjusted in an axial or radial direction of the spindle
121
, the universal connecting rod
17
flexes, thereby resulting in unsmooth rotation of the spindle
121
and the cutter shaft
151
. Furthermore, because the length of the universal connecting rod
17
is limited, and because the device
10
can only be used to machine a workpiece, which is shorter than the universal connecting rod
17
, the application range of the device
10
is reduced.
(2) To form a nut or a headed bolt, a workpiece has to be machined on the device
10
and a lathe for forming threads, thereby resulting in an increase in the machining costs, the machine-occupied space and the tool-changing time.
U.S. Pat. No. 5,490,307 disclosed an improved lathe, which is provided with a polygon machining device to overcome the above-mentioned problems. In the improved lathe, a spindle and a polygon machining cutter unit are driven respectively by different driving sources at different rotational-speed ratios, and have no mechanical transmission therebetween. As a result, when the feeding distance of the polygon machining cutter unit is relatively large or when the material of a workpiece to be machined is relatively hard, the feeding of the cutter unit is delayed, thereby resulting in failure to form an accurate polygon on the workpiece.
SUMMARY OF THE INVENTION
The object of this invention is to provide a lathe with a polygon machining device, which includes a spindle and a polygon machining cutter unit that are driven by the same driving source and that have a mechanical transmission therebetween, thereby feeding the cutter unit positively.
According to this invention, a lathe has a machine body including a spindle that is journalled thereon, and a chuck that is adapted to hold a workpiece to be machined. A transverse rail member is disposed slidably on the machine body, and extends in a transverse direction relative to the spindle. The rail member is movable on the machine body along a longitudinal direction of the spindle. A cutter carrying plate is disposed slidably on the rail member, and is movable along a longitudinal direction of the rail member. A turret unit is attached to the carrying plate, and is adapted to lathe the workpiece. A polygon machining cutter unit is attached to the carrying plate, and is spaced apart from the turret unit in the longitudinal direction of the rail member. The polygon machining cutter unit is adapted to form a plane on the workpiece. A cutter shaft is attached fixedly to the polygon machining cutter unit, and is disposed parallel to the spindle. A rigid driving shaft is journalled on the machine body, and is disposed parallel to the spindle. A driving source is used for rotating the spindle. A clutch device is movable between a connecting position, where rotation is transferred between the spindle and the driving shaft so as to rotate the driving shaft, and a disconnecting position, where rotation of the driving shaft is stopped. A rigid driven shaft is journalled on the machine body, and extends in the transverse direction relative to the spindle. A first gearing interconnects the driving shaft and the driven shaft, and is movable on the driving shaft for transferring rotation from the driving shaft to the driven shaft. A second gearing interconnects the driven shaft and the cutter shaft, and is movable on the driven shaft for transferring rotation from the driven shaft to the cutter shaft.
Because the driving shaft, the first gearing, the driven shaft and the second gearing constitute cooperatively a mechanical transmission between the cutter shaft and the spindle, the cutter unit can be fed at appropriate times, thereby forming an accurate polygon on the workpiece.
REFERENCES:
patent: 4413539 (1983-11-01), Ishizuka et al.
patent: 5490307 (1996-02-01), Link
patent: 6173630 (2001-01-01), Wu
Ohlandt Greeley Ruggiero & Perle L.L.P.
Tsai Henry
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