Toolhead for a shaping machine

Details Toolhead for a shaping machine Toolhead for a shaping machine

1997-12-18

1999-11-16

Bray, W. Donald

Woodworking

Rotary cutter

Disk cutter including side attached, edge cutting bit

144176, 144220, 407 31, B27G 1304, B27L 1102

Patent

active

059839678

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a toolhead for a profile machining tool for machining the lateral segments of logs having a rotationally-driven toolhead main body with a plurality of chopping teeth groups on its periphery and at least one planing tool on its face, wherein each group of chopping teeth exhibits at least one chopping tooth on the face.
Profile machining tools of this type are known (e.g. DE 3038566 C2). They remove lateral segments from logs that are unworked or evened on two sides, wherein the chopping teeth of the toolhead produce product chips. A planing tool mounted on the face of the toolhead and often comprising circular saw segments, a circular saw ring, or planing teeth finishes the surface generated on the log. The planing tool can be placed so that it cuts before or after the adjacent chopping tooth, designated here as a "face chopping tooth." Preceding planing teeth prevent any cracks originated from the face chopping tooth from extending down into the remaining wooden surface. Succeeding planing teeth finish the relatively uneven wooden surface generated by the face chopping teeth.
Due to the unavoidable wear, the planing teeth and chopping teeth must be replaced regularly. The relatively long associated downtime is a major disadvantage of such toolheads.
One known toolhead of this type (DE 28 50 263 A1) uses a replaceable planing tool fastened to the toolhead main body. However, the chopping teeth and especially the wear-prone face chopping teeth must still be replaced individually.
Thus, it is the object of the invention to configure the toolhead of the type cited in the beginning such that the downtimes necessitated by unavoidable tool wear are greatly reduced.


SUMMARY OF THE INVENTION

This object is accomplished according to the invention by attaching both the face chopping tooth and the planing tool to a common toolholder, which is replaceably fastened to the toolhead main.
Hence, replacement of the planing tools and the face chopping teeth in each group of chopping teeth is much simpler and easier. It is sufficient to detach the toolholder from the toolhead main body and exchange the toolhead for a new toolholder having pre-adjusted tools such that an adjustment of the tool cutting edges in their mounted state on the toolhead is no longer necessary. The required downtime can be reduced to a few minutes so that tool change can be performed with only slight interruption during a current shift as well as at the end of a shift.
In this connection, experience showing that the planing tools and the face chopping teeth are the most wear-prone tools due to their constant engagement on every occurring log shape was used in the invention. In contrast, the chopping teeth further removed from the face axially are not in constant engagement, so they wear considerably less. Hence, these additional chopping teeth can be fastened directly to the toolhead main body.
Depending on the embodiment of the planing tools, the toolholder can be a ring segment or a ring. If circular saw segments, to which a respective group of chopping teeth is usually allocated, are used as planing tools, then it is advantageous to embody the toolholder as a ring segment bearing the face chopping tooth on its forward end and bearing the circular saw ring segment on its face as a planing tool.
If, however, the planing tool is embodied as a circular saw ring, it is practical to embody the toolholder as a ring as well.
A particularly preferred embodiment of the invention provides that the toolholder is fastened to the toolhead main body by means of quick-tensioning devices. These devices allow especially quick tool change so that required machine downtime can be reduced quite substantially.
The quick-tensioning device preferably has at least one tensioning pin protruding from and parallel with respect to axis to the toolholder and extending into a tensioning hole of the toolhead main body and herein respectively in engagement with a tensioning apparatus.
An especially favorable construction pro

REFERENCES:
patent: 3780778 (1973-12-01), Chapman
patent: 3889333 (1975-06-01), Katz et al.
patent: 4263949 (1981-04-01), Kivimaa
patent: 4456045 (1984-06-01), Gregoire
Brochure: CyTec Zylindertechnik GmbH "Flexible Production Systems" (Mar. 1992) pp. 1-17.

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