Metal tools and implements – making – Saw-making or furbishing device or machine
Patent
1992-12-08
1994-03-22
Parker, Roscoe V.
Metal tools and implements, making
Saw-making or furbishing device or machine
76112, B23D 6320, B23D 6500, C21D 924
Patent
active
052954170
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a multistep finishing process carried out on saw blade teeth, wherein station for complementary finishing operations, position in the first station, station, and
The invention also relates to a saw finishing machine for carrying out such a process, comprising respective tooth will adopt a desired position in the first station.
In the case of a known saw finishing machine of this generic kind (DE 29 40 730 A1) a fixture for retaining a saw blade is disposed between a soldering tool and a pair of flank grinders. To repair a saw blade which is furnished with hard metal plates, first all the teeth having a damaged hard metal plate are placed one after the other in the working range of the soldering tool so as have the hard metal plates unsoldered. Subsequently, all the plate seats which have become free are reworked, and then fresh hard metal plates are attached by soldering with the same soldering tool and, finally, these hard metal plates are ground by the two flank grinders at the flanks and at the tooth circumference, too, where required. It is not intended to have the flank grinders operate at the same time as the soldering tool, nor is that possible with the known machine due to tooth pitch errors which are unavoidable, at least with greater saw blades. At any point in time, therefore, either the soldering tool or the pair of flank grinders is not utilized, and the complete finishing of a saw blade takes a corresponding length of time.
It is the object of the invention to shorten the time of finishing a saw blade of which individual teeth or all of the teeth require a plurality of successive operational steps to be taken.
Starting from a process of the kind specified initially, this object is met, in accordance with the invention, as far as the process is concerned, in that predetermined edge of the tooth which is stopped at the second station whenever the saw blade has come to a halt, no matter what the tooth pitch error is, sensor is moved in longitudinal direction of the saw blade, starting from the starting point, to a reference point which depends on the position of the edge of that tooth, into an operative position by a distance which depends on the path of the sensor from the starting point to the reference point to finish the tooth which is located at the second station, and point and the finishing device to the inoperative position.
In this manner two or more operations can take place at the same time at a saw blade which is characterized by more or less great and irregular tooth pitch errors, without impairing the accuracy of the finishing due to the pitch errors. The type of work to be done is of secondary importance. Applying tooth tips of hard material and subsequent heat treatment may be mentioned as an example, or the soldering and subsequent grinding of small hard metal plates, or the grinding of tooth faces and tooth backs. In any case, the simultaneous accomplishment of two or more operating steps to which a saw blade is subjected means saving time and that, in turn, contributes to lowering the cost of making or repairing the saw blade.
To the extent that the object in question relates to a machine, it is met, in accordance with the invention, starting from a saw finishing machine of the kind mentioned initially, in that a sensor for scanning a predetermined edge of a tooth and a finishing device for finishing that tooth are reciprocable in common at the second station in and against the direction of movement of the saw blade.
An embodiment of the invention will be described in greater detail below with reference to diagrammatic drawings, in which:
FIG. 1 is a side elevational view of a saw finishing machine according to the invention;
FIG. 2 is the partial top plan view in the direction of arrow II in FIG. 1;
FIG. 3 is an enlarged cut-out of FIG. 1; and
FIG. 4 is a motion diagram relating to FIG. 3.
The machine illustrated here is destined for use in finishing a saw blade 10 of a band saw whose teeth 12 are punched out either individually or in groups and have
REFERENCES:
patent: 3502312 (1970-03-01), Douglass
Beck Ernst
Pokorny Erich
Parker Roscoe V.
Vollmer Werke Maschinenfabrik GmbH
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