Woodworking – Feeder or presser – Presser bar or chip breaker
Patent
1994-03-09
1995-05-16
Bray, W. Donald
Woodworking
Feeder or presser
Presser bar or chip breaker
144114R, 144117R, 144252R, B27C 114, B27C 502
Patent
active
054152127
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to milling cutter chip breakers.
The chip breaker breaks up chips removed from the workpiece by the cutting tool and usually comprises a hood which prevents chips scattering and channels them to an extractor system. On one side of the cutting tool is the chip breaker shoe while on the other side is a workpiece pressure pad which holds the workpieces against the bedplate. It is desirable that these elements operate close to the cutting tool.
BACKGROUND ART
Because the milling cutter must use different cutting tools to cut different profiles on different workpieces, it is required to provide adjustment for the pressure pad and for the chip breaker shoe.
This is conventionally done by arranging the pad and shoe on brackets with provision for manual adjustment via guide slots and clamping screws both parallel to and perpendicularly to the bedplate. Adjustment is carried out by effecting each independent adjustment in turn and several times until the right combination of perpendicular and parallel movements is hit upon. The process is time consuming and only as accurate as the skill of the operator allows, and can lead to scrap components.
DISCLOSURE OF THE INVENTION
The present invention provides a milling cutter chip breaker without this disadvantage.
The invention comprises a milling cutter chip breaker comprising a support mounting an operative chip breaker element adjustably and with tangential movement relatively to a cutting tool.
Said element may be resiliently urged towards a workpiece.
Said element may comprise a chip breaker shoe, which may be pivotally mounted on the support--the pivot may be on the side of the cutter tool remote from the shoe.
The same element may, however, comprise a workpiece pressure pad on the rear side of the cutter tool remote from the chip breaker shoe. The pad may be mounted in a slide.
The support may be adjustable perpendicularly to the milling cutter bedplate.
The support may comprise two support members relatively adjustable lengthwise of the bedplate, one support member supporting the chip breaker shoe and the other support member supporting a workpiece pressure pad, whereby the shoe and the pad are relatively adjustable lengthwise of the bedplate.
The support adjustment may be effected automatically, for example by electric motor means under computer control. The arrangement may comprise a cutter tool measuring device inputting tool measurements to the computer which is programmed to determine chip breaker adjustments therefrom and to command the motor means to effect same.
BRIEF DESCRIPTION OF THE DRAWINGS
One embodiment of a milling cutter chip breaker according to the invention will now be described with reference to the accompanying drawings, in which:
FIG. 1 is a sectional side elevation; and
FIG. 2 is a plan view of the chip breaker of FIG. 1.
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 and 2 illustrate a milling cutter chip breaker 11 comprising a support 12 mounting an operative chip breaker element 13 adjustably and with tangential movement relatively to a cutter tool 14.
The element 13 comprises the chip breaker shoe. It is pivotally mounted on the support 12, the pivot 15 being on the side of the cutter tool 14 remote from the shoe 13, the shoe 13 being on a bracket 13a and being resiliently urged towards a workpiece 16 (indicated in broken line) on the bed plate 17 of the milling cutter by a cylinder 18 pivoted at pivot 19 on the support 12.
It will be seen that the edge 13b of the chip breaker shoe 13 has tangential movement relatively to the cutter tool 14 along the arc 21 centered on the pivot 15. It is not, of course, important that the movement be exactly tangential to the cutter tool, but that the edge 13b is always closely--but safely--spaced from the tool 14.
A workpiece pressure pad 22 is located on the rear side of the cutter tool 14 remote from the chip breaker shoe 13 and is also an operative chip breaker element mounted on the support 12 adjustably and with angular movement (45.degree.)
REFERENCES:
patent: 863505 (1907-08-01), Budlong
patent: 1079032 (1913-11-01), Solem
patent: 1240769 (1917-09-01), Osteman
patent: 1619008 (1927-03-01), Wilderson
patent: 1651551 (1927-12-01), Roman
patent: 1796186 (1931-03-01), Blood et al.
patent: 2577975 (1951-12-01), Moore
patent: 2788035 (1957-04-01), Veersma
patent: 5007469 (1991-04-01), Englert et al.
"Innovationen in der Holzverarbietung", Holz Als Roh-Und Werkstoff, vol. 48, No. 1 Jan. 1990.
Bray W. Donald
Wadkin PLC
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