Cutters – for shaping – Rotary cutting tool – Including holder having seat for inserted tool
Patent
1995-01-30
1999-12-21
Pitts, Andrea L.
Cutters, for shaping
Rotary cutting tool
Including holder having seat for inserted tool
144230, 407105, 407111, 407 40, B27G 1310, B23C 522
Patent
active
060040793
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a cutter head, in particular a profile cutter head, with a base body, which is provided with at least two fixtures, which are uniformly distributed over the base body's circumference and in which blades can be fixed interchangeably by means of one clamping device each, which exhibits at least one clamping element each and at least one clamping bolt, which interacts with said clamping element and the base body.
The known cutter heads of this kind are used to machine, for example to produce profiles, of solid wood and derived timber products. The drawback with these known tools is that they can be used usually only as a single and universal cutter head, but cannot be integrated into tool kits. Furthermore, the range in which the diameter and the cutting width can be selected, is frequently not adequately large. Another drawback is that the use of light metal for the base body presents a problem, since the clamping forces can result in nicks in the fixtures. If the clamping elements and the blades are fixed by a pin-hole connection, then profiles that overhang on one side can result in pin deformation, a feature that leads to a change in the position of the clamping elements and blades, thus resulting in surface errors and an increase in the residual unbalance. Furthermore, these known tools do not hold the preliminary dividing cut to a minimum, a process that is necessary for a cleaner surface during the machining of solid wood, since the clamping elements do not exhibit any profile contours below the cutting edge of the blades.
Therefore, the invention is based on the problem of providing an improved cutter head that avoids the problems of conventional devices.
SUMMARY OF THE INVENTION
The cutter head, according to the invention, can be used to machine and in particular to profile solid wood, derived timber products, plastics and nonferrous metals, and in particular as a single tool or in such a manner that it is integrated into tool kits. The tools can be designed with bore, with shaft and with defined profile.
Furthermore, the dimensional range of the cutter head according to the invention, thus the range of the selectable diameter and the selectable cutting width, is significantly greater than for known cutter heads and can be selected steplessly with constant accuracy of profile. The material for the blades and the cutting geometry can be optimally chosen for the corresponding field of application.
Even the use of light metal for the base body is no problem, since the material of the base body is subjected only to compressive stress due to the clamping elements. Therefore, a significant reduction in weight, good handling, less residual unbalance and thus also better care of the bearing is achieved.
It is especially advantageous if the swivel axis of the clamping elements relative to a bearing surface area, which transfers the clamping force to the blade and pushes said blade against a contact surface of the fixture, is moved in the direction of this contact surface. The pull of the clamping bolt can be converted quite well into the torque to be exerted on the clamping element.
In a preferred embodiment each clamping element exhibits as a bearing element a semi-cylindrical material segment, which projects beyond the bearing surface area and which extends in the axial direction of the base body and reaches into a groove of the fixture, whose cross section is semi-circular. Such a bearing is simple, produces a shape-locking connection between clamping element and base body in the axial direction and accurate positioning in this direction. Furthermore, the semi-circular groove excludes the risk of possible nicks.
Preferably the clamping bolts engage in the region between the bearing point of the clamping element and its bearing surface area intended to rest against the knife.
The base body is provided preferably with one bore each for each clamping bolt, said bore exhibiting a shoulder, which points away from the clamping element and against which the
REFERENCES:
patent: 3237275 (1966-03-01), Middleton
patent: 3907016 (1975-09-01), Nicholson et al.
patent: 4506711 (1985-03-01), Armbruster et al.
International Search Report dated Oct. 5, 1993.
Gebruder Leitz GmbH & Co. et al.
Pitts Andrea L.
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