Cutting – Rotatable disc tool pair or tool and carrier – With means to support work relative to tool
Reexamination Certificate
2000-08-30
2003-07-15
Shoap, Allan N. (Department: 3724)
Cutting
Rotatable disc tool pair or tool and carrier
With means to support work relative to tool
C083S473000, C083S477200, C083S481000, C083S698410
Reexamination Certificate
active
06591725
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a circular sawing machine, comprising a supporting surface for the workpiece and a saw blade which projects from the supporting surface in the region of an opening, the saw blade being held and driven by a drive flange and the saw blade being mounted to pivot in the circular sawing machine.
Circular sawing machines of the above kind have long been known in the woodworking field, such as in carpenter's shops, joiners' shops and woodworking shops. They are used to carry out a wide variety of operations on workpieces made of wood or plastics material. One intended purpose is, for example, to trim workpieces in sheet form with such machines. At the same time it is also possible to use such machines to cut grooves or recesses of the same kind in the workpieces, which may be mouldings or panels for example.
The saw blade is held on a drive flange and the drive flange is situated, for example, on a mounting. Also provided on the drive flange are means for driving the saw blade, which means may be of considerable length in the axial direction. Provision may, for example, also be made for a drive motor to be positioned on the drive shaft driving the saw blade.
For making angled cuts it is known for the saw blade to be pivoted to one side about an axis which generally lies in the plane of the supporting surface. It is then possible for inclined grooves or mitres, for example, to be cut. Because of the large size of the drive on the flange there is only a limited capacity for pivoting. If, for example, it is desired to make a cut in an opposed, inclined direction, then there are machines known in the joinery field for example in which the complete mounting is designed to be rotatable about a substantially vertical axis and the whole arrangement including the saw blade is turned through 180° about this axis to make a cut in the direction mentioned. It is clear that it is very complicated and expensive to produce adjustability of this kind.
Otherwise the only option which the woodworker has is to feed the workpiece in some other way and under certain circumstances this may not be possible. The range of uses to which such known machines can be put is therefore limited.
It is an object of the present invention to provide an improved circular sawing machine of the above kind, in which their adjustability and convenience to the user would be greatly increased.
BRIEF SUMMARY OF THE INVENTION
The present invention provides circular sawing machine, comprising a supporting surface for the workpiece and a saw blade which projects from the supporting surface in the region of an opening, the saw blade being held and driven by a drive flange and the saw blade being mounted to pivot in the circular sawing machine, characterised in that provision is made for the saw blade to be pivotable to both sides in the region of the opening relative to a plane at right angles to the supporting surface.
A design of this kind provides an immense advantage in circular sawing machines according to the invention. The possibility of enabling various operations to be performed simply by pivoting the saw blade makes the work very much easier. At the same time it is possible for the pivotable mounting of the circular saw blade, which is known in principle, to be retained in the same form and simply to have added to it the appropriate means for obtaining a larger range of pivot, thus making the cost and complication of obtaining a machine of this kind considerably less than was needed in the prior art for a circular saw arrangement rotatable about a vertical axis.
In a preferred embodiment of the invention, provision is made for a mounting to be provided for the drive flange and for the mounting to be made narrow and slender in the direction of pivot below the supporting surface. In the prior art, particularly in the region of the drive spindle and on at least one side relative to the saw blade, a relatively wide arrangement has been produced to mount and drive the saw blade. Because of this arrangement of large size on one side it was impossible to achieve pivotability in both directions, given that the structure, being wide on one side, collided with the underside of the supporting surface if pivoted in this direction. The proposal according to the invention in the first place provides a slender mounting which is narrow in the direction of pivot, but whose strength is not reduced for this reason. The important thing in this case is that, in the region below the supporting surface the mounting, or rather the layout of the drive flange, is produced in such a way as to save as much space as possible, in order to provide sufficient range of pivot for a desired angle of pivot in both directions.
For this design, it is also possible for the members which hold the drive flange to be arranged on essentially one side of the mounting. It is for example conceivable in this case for the drive flange to be mounted in such a way as to be substantially overhanging.
In an alternative embodiment, the drive flange is provided on a mounting and the mounting extends on both sides of the saw blade, substantially symmetrically to the saw blade, in the area below the supporting surface. Optimum use is made of the space available by a design of this kind. In accordance with the invention, it is proposed that substantially symmetrical pivotability be obtained, i.e. pivotability in both directions relative to the opening from which the saw blade projects. In the final analysis it is the mounting of the saw blade on the drive flange which restricts the maximum range of pivot. To obtain as large as possible a range of pivot in both directions, an advantageous provision which is made in this case is for the means for supporting the saw blade on the mounting also to be symmetrically positioned in order to make optimum use of the space available.
Provision is further made for the drive flange to comprise a drivable spindle flange and a mating flange which co-operates with the spindle flange and is detachable therefrom. The design according to the invention in this case is selected to be such for example that the mating flange may also be in the form of a securing nut which can be screwed onto the spindle flange. The mounting of the drive flange in this case is substantially overhung, i.e. a bearing is provided on each side of the saw blade. As an alternative to this, provision may be made for the mounting to comprise two holding parts which are hinged together and for the first holding part to carry the spindle flange and the second to carry the mating flange, with the two flanges being mounted to rotate. In the arrangement described here, the symmetrical division of the respective functions relative to the plane of the saw blade is maintained and the mounting is split into two elements. Advantageously, the saw blade is centrally arranged, to rotate between two bearings.
Because of the hinged connection between the two holding parts, it is also possible for a quick-change arrangement for the saw blade to be produced easily. In an alternative embodiment, the two holding parts can be connected together substantially permanently, or in other words to be bolted together, although it would then be more laborious to change a saw blade.
What is achieved by the design according to the invention is that an angle of pivot of ±60° is possible for the saw blade. This angle of pivot is possible in both directions, i.e. complex operations can be performed without any complicated re-orientation or re-positioning of the workpiece. What is preferably used is a range of angles of pivot of ±45°, which will allow even mitre cuts or the like to be made in workpieces without any lengthy setting-up times. The pivotability is relative in this case to the vertically orientated saw blade or to an imaginary plane extending at right angles to the supporting surface.
The above circular sawing machines preferably take the form of circular saw benches and are used in joiners' shops, carpenters' s
Choi Stephen
Jacobson & Holman PLLC
Otto Martin Maschinenbau GmbH & Co.
Shoap Allan N.
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