Metal tools and implements – making – Saw-making or furbishing device or machine – Sharpening and gumming
Patent
1997-09-29
1999-04-06
Payer, Hwei-Siu
Metal tools and implements, making
Saw-making or furbishing device or machine
Sharpening and gumming
76 43, B23D 6312, B24B 5312
Patent
active
058904018
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus according to the preamble of claim 1.
In such apparatuses the grinding slide on the one hand and the feed slide on the other hand are controlled by a CNC control or a cam control system in such a manner that the grinding wheel plunges along a tooth face each into a tooth gap of the toothing of a saw blade while the feed slide remains stationary. As soon as the grinding wheel has reached the bottom of the tooth, a feed motion of the saw blade commences which is initiated by a driver in the form of a finger or a latch, which is supported at the feed slide, acting on a neighbouring tooth face. During the feed motion the grinding wheel generally plunges still deeper into the bottom of the tooth, and is then gradually retracted in order to sharpen the adjacent tooth back and finally its uppermost part which belongs to the tooth tip, the so-called flank. For this type of continuous path-controlled sharpening of saw toothings a grinding wheel is required which at its periphery comprises a profile which is adapted in a certain manner to the toothing profile.
Due to wear, the grinding wheel periphery gradually assumes a deviating profile; it is therefore necessary to dress the grinding wheel from time to time. For this purpose, the use of dressing diamonds is known which act on the grinding wheel in a spot-type manner and which can be moved under continuous path control in an own coordinate system, which is independent of the grinding device. Diamond dressing rolls are also known with a profile which complements the intended peripheral profile of the grinding wheel and which are also supported in an own device to be adjustable in at least two coordinates so that they can be brought into engagement with the grinding wheel which is only rotating while the grinding slide is stationary.
The invention is based on the object to simplify the dressing of grinding wheels in an apparatus for the continuous path-controlled sharpening of saw toothings and to shorten the required time for each dressing operation.
The object is solved according to the invention by the characteristics of claim 1. Advantageous further developments are the subject matter of the dependent claims.
The dressing tool according to the invention which preferably is a circular small plate consisting, at least partially, of polycrystalline diamond, requires little space and can therefore be located at the feed slide in the immediate vicinity of the saw blade in a space-saving manner in an inoperative position where the dressing tool does not interfere with the sharpening of saw toothings. In the sharpening intervals the dressing tool has therefore to cover only a small travel from its inoperative position into its dressing position in order to provide the conditions for the grinding wheel to now cooperate with the dressing tool instead of the saw toothing, by means of which it will be dressed in a single working stroke of the grinding slide and the feed slide. The dressing operation by means of the dressing tool differs from the normal operation during sharpening of saw toothings merely in that the feed finger is rendered stationary in its inoperative position during the dressing intervals, the dressing tool at the feed slide is moved into its dressing position and the motions of the grinding slide and the feed slide are adapted to the desired profile of the grinding wheel by switching the control system to the dressing mode. Compared to the normal equipment of a saw blade sharpening machine, an additional, controlled axis is not required for the dressing of the grinding wheel.
An embodiment of the invention will be described in the following with reference to schematic drawings with further details. In the drawings:
FIG. 1 shows the front view of an apparatus according to the invention; and
FIG. 2 shows the side view in the direction of the arrow II in FIG. 1.
In the drawings, a band saw blade is illustrated as an example of a saw blade 10 the toothing of which is to be sharpened; in the present context, however, the
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Hensinger Bruno
Lenard Peter
Browning Clifford W.
Payer Hwei-Siu
Vollmer Werke Maschinenfabrik GmbH
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