Woodworking – Rotary cutter – Having slotted bit seat
Patent
1998-01-14
1999-05-18
Bray, W. Donald
Woodworking
Rotary cutter
Having slotted bit seat
144218, 144241, 407 50, 407 49, 407108, B27G13/00
Patent
active
059041935
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a cutter head, in particular a planing cutter head, having the features of the precharacterizing clause of claim 1.
SUMMARY OF THE INVENTION
A known cutter head of the said type, for the working of wood, has a blade carrier, which is provided with a plurality of mountings for blades at equal intervals along its circumference. The mountings are open radially outwards and extend parallel to the axis of rotation of the blade carrier. Provided in each mounting is a wedge grip which can be moved relative to the blade carrier and with respect to the respective blade. When the cutter head is set in rotation, the wedge grips move radially outwards on account of the centrifugal force. The wedge grips are designed such that, during this movement, they press the blades against a stop of the mounting. When the cutter head is at rest, the blades can be removed in the axial direction, for example for resharpening. In spite of the simple clamping mechanism, the cutter head described still leaves something to be desired in use.
BRIEF DESCRIPTION OF THE INVENTION
The invention is therefore based on the object of improving a cutter head of the type described at the beginning. This object is achieved according to the invention by a cutter head as set both herein.
By virtue of the fact that, in the case of the cutter head according to the invention, between the blade and the wedge grip there is arranged a holding strip which can be moved relative to the wedge grip and the stop and which releases the blade for removal radially outwards when the wedge grip is moved inwards, the blades can be removed from the cutter head for turning or resharpening without disassembling the said cutter head, even if the end faces of the latter are not accessible or not adequately accessible.
For a defined position of the blade and the holding strip during clamping and for absorbing the centrifugal forces, it is of advantage to provide positioning elements between the blade and the holding strip.
An advantageous combination of the swivelling function and the absorption of centrifugal forces is obtained if the holding strip grips underneath the stop in the radial direction, forming an at least linear location of contact. The swivelling movement is assisted if between the holding strip and the wedge grip there is provided at least one compression spring, the bearing point of which on the holding strip lies radially further inwards than the location of contact between the holding strip and the stop. If the location of contact forms a plane running parallel to the free face of the blade, this provides the advantage that the cutting circle remains constant when the blade is resharpened.
For movement of the wedge grip in the radial direction, both inwards and outwards, in particular for pretensioning, it is advantageous to provide one or more, depending on the length of the wedge grip, tensioning screws, which take the wedge grip along with them in both directions.
To adapt the chip breaking and chip flow to different workpiece materials, it is of advantage if the stop is designed as an exchangeable stop strip, in order to be able to vary the size of the cutting face, located radially outside the stop strip, of the blade and/or the chip space.
In order to define the maximum amount of material that can be removed at the front of the blade in the case of resharpenable blades, the blade advantageously has in its front a groove, the depth of which is chosen to be equal to maximum amount of material that can be removed.
To reduce weight, in particular in the case of long cutter heads, it is of advantage to produce the blade carrier from aluminium.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention is explained in more detail below with reference to an exemplary embodiment represented in the drawing, in which:
FIG. 1 shows a front view of the exemplary embodiment in the pretensioned state,
FIG. 2 shows an only partially represented section through the exemplary embodiment in the pret
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Bray W. Donald
Gebr. Leitz GmbH & Co.
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