Metal tools and implements – making – Saw-making or furbishing device or machine – Sharpening and gumming
Reexamination Certificate
2000-03-29
2001-08-28
Watts, Douglas D. (Department: 3724)
Metal tools and implements, making
Saw-making or furbishing device or machine
Sharpening and gumming
C076S037000
Reexamination Certificate
active
06279424
ABSTRACT:
The invention relates to a machine as defined in the preamble of claim
1
.
In a known machine of this kind (DE 27 51 408 A1) the reference axis is defined by a rocker bearing which is disposed on the machine bed and supports a radially projecting beam. The beam is formed with a reciprocating slide guide means along which a reciprocating slide is displaceable radially with respect to the reference axis. A pivot bearing means on the reciprocating slide defines a pivot axis which extends parallel to the reciprocating slide guide means and intersects the reference axis at a right angle. A shaft, with a spindle head secured to it, is supported in the pivot bearing means. Inside the spindle head, a spindle sleeve is guided so as to be displaced by means of a feed drive along a grinding spindle axis which intersects the pivot axis at a right angle. The spindle sleeve, which thus corresponds to a feed slide, includes a grinding spindle adapted to be driven in rotation and carrying a plate-shaped grinding disc for sharpening the teeth of a circular saw blade. When straight surfaces at the front of teeth (cutting faces) or straight surfaces at the back of teeth (clearance faces) are to be sharpened, the spindle sleeve always is adjusted by the feed drive in such a way that the active front surface of the grinding disc will lie in a plane which contains the reference axis. For the grinding of oblique surfaces, the spindle head is swung about the pivot axis in one or the other direction, depending on the direction of inclination. To accomplish that, a cross bar is fastened to that end of the shaft carrying the spindle head which is remote from the spindle head, and two rolls are supported to be freely rotatable on this cross bar at equal distances from the pivot axis and diametrically opposed with respect to the latter. These two rolls are arranged between a piston and cylinder unit each and an adjustable stop each in such a way that the cross bar and, together with it, the shaft carrying both the cross bar and the spindle head can be swung back and forth within a pivot range which is limited by the stops. The inert masses thus to be moved are considerable indeed because the spindle sleeve and its feed drive take part in the pivoting motion. Consequently the pivoting frequency to be achieved with swinging movements back and forth is limited.
It is the object of the invention to improve a machine for machining workpieces which have cutting teeth, especially saw blades such that it can operate faster than the known machine described when machining surfaces at the front or back of teeth which are oblique in alternating directions or chamfers.
The object is met, in accordance with the invention, by the features of claim
1
. Advantageous further developments are the subject matter of the subclaims.
The pivot drive according to the invention accomplished by means of a stepping motor while, at the same time, dispensing with any (mechanical) stops or abutments permits particularly quick reciprocating pivoting movements of the tool head and of all those structural components which are connected to it for joint swinging motion. And yet that does not give rise to any disturbing oscillations in the kinematic chain which extends all the way from the machine bed to the tool. Any conventional stepping motor may be used which is suitable to achieve the speediest acceleration possible of the masses to be pivoted as well as smooth decelaration thereof as the desired inclination is approached. Stepdown gearing such as recited in claim
3
provides further assurance that pivoting movements will take place without oscillations.
REFERENCES:
patent: 4136585 (1979-01-01), Lenard
patent: 4436000 (1984-03-01), Lenard
patent: 4641007 (1987-02-01), Lach
patent: 5485767 (1996-01-01), Ellis
patent: 27 51 408 A1 (1979-05-01), None
patent: 42 42 906 C2 (1994-06-01), None
patent: 92/19406 A (1992-11-01), None
Patent Abstracts of Japan, vol. 009, No. 103 (M-377), Aug. 5, 1985 & JP 59 227314A.
Bailer Norbert
Lenard Peter
Riehlein Fritz
Browning Clifford W.
Vollmer Werke Maschinenfabrik GmbH
Watts Douglas D.
Woodard Emhardt Naughton Moriarty & McNett
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