Turning – Pattern section – Cam-controlled cutter
Patent
1993-12-10
1995-07-25
Bishop, Steven C.
Turning
Pattern section
Cam-controlled cutter
82152, 142 1, 142 12, 142 55, B23B 328, B27C 700
Patent
active
054352150
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an ornamental turning device and to a tool drive mechanism and a tool for such an ornamental turning device.
An ornamental turning device of this type may be used to engrave a pattern in an object, for example a wooden goblet, which has been worked upon a lathe.
It is known to engrave a pattern on an object such as a goblet by hand. For a pattern which repeats itself around the circumference or perimeter of the object, it is necessary to make accurate measurements of the circumference of the object and then to mark the surface of the object at the precise points at which it will be necessary to make cuts in the object. Such a process is time consuming and requires a high level of skill.
According to a first aspect of the invention: there is provided an ornamental turning device comprising:
a rotatable shaft adapted to receive a chuck at a first end;
a tool for engraving an object attachable to the chuck, and comprising a reciprocating blade; and
tool drive means driveably connectable to the shaft for driving the tool, whereby in use, the rate at which the blade reciprocates is proportional to the rotational speed of the shaft.
By means of the device according to the invention, an object which has been worked on a lathe, may be engraved whilst still in place on the lathe.
By linking the rate of reciprocation of the blade of the tool with the rotational speed of the shaft on which the object to be engraved is mounted by means of the chuck, the spacing of cuts formed by the tool is linked to the circumferential measurement of the object. This ensures that grooves are regularly spaced around the circumference.
Preferably, the device further comprises a tool rest which ensures that the position of the tool in a plane at right angles to the axis of rotation of the shaft remains substantially constant. The shaft may be orientated at any convenient position, but generally it will have a horizontal axis of rotation. The tool rest may then comprise a substantially horizontal surface on which the tool may rest. The horizontal movement of the tool may then be dictated by the operator, whilst the vertical position of the tool remains substantially constant.
Advantageously, the tool should approach the work piece radially to its axis of rotation. The tool rest should therefore be tiltable in two directions in order that diamonds or "lattice work" grooves be produced.
Alternatively, the tool may be held on the tool rest by mechanical means, which mechanical means determine the horizontal movement of the tool.
The extent of horizontal movement of the tool will determine the length of the cut produced in the object by the tool.
Preferably, the device comprises a driving cog connectable to the shaft, and the tool drive means comprises:
a driven cog driveably connectable to the driving cog;
at least one cam rotatable with the driven cog, which cam comprises at least one lobe;
a cam follower adapted to follow the surface of the at least one cam; and
means for connecting the tool to the cam follower, whereby reciprocation of the blade is determined by the movement of the cam follower over the cam surface.
According to a second aspect of the invention there is provided a tool drive means comprising:
a driven cog;
at least one cam rotatable with the driven cog, which cam comprises at least one lobe;
a moveable cam follower which follows the surface of the at least one cam: and
means for connecting a tool to the cam follower, whereby reciprocation of a blade of the tool is determined by movement of the cam follower.
Preferably, the driving cog is positioned on the shaft on which the object to be worked is positioned. In alternative arrangements however, the driving cog may be positioned on a separate shaft and connected to the shaft.
Preferably, the driving and driven cogs are connected to one another by means of a drive belt, chain, or intermediate cog, etc.
The at least one lobe comprises a concave surface in the surface of the cam. The presence of the lobe therefore causes the cam follower to move rad
REFERENCES:
patent: 57158 (1866-08-01), Linniatt
patent: 64420 (1867-05-01), Holroyd
patent: 281539 (1883-07-01), Marshall
patent: 1874470 (1932-08-01), Drissner
patent: 1879201 (1932-09-01), Groene
patent: 4646595 (1987-03-01), Slee
patent: 5181442 (1993-01-01), Nezu
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