Metal tools and implements – making – Saw-making or furbishing device or machine – Stretching
Patent
1998-01-13
1999-08-03
Payer, Hwei-Siu
Metal tools and implements, making
Saw-making or furbishing device or machine
Stretching
76 251, B23D 6318, B21D 102
Patent
active
059310570
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a saw straightening apparatus.
A known apparatus of this kind (DE 42 14 784 A1) comprises a machine table arranged between two return pulleys around which a saw blade is moved. In the direction of movement of the saw blade, a plurality of successive measuring stations are disposed on the machine table, namely a station to measure the tension profile, a station to measure the curvature, a station to measure the distance, and a station to measure bulges and indentations. The latter is followed by a processing unit which comprises a plurality of roller pairs, namely one pair to smooth bulges, one to level indentations, and one to correct the tension profile and back curvature of the saw blade. The latter pair of rollers is composed of an upper roller supported on the upper leg of a C-shaped roller stand and adapted to be pressed in downward direction by an hydraulic piston and cylinder unit against the saw blade which passes horizontally between the rollers, and a lower roller on which the saw blade rests. The lower roller is supported in a swivel means carried by the lower leg of the C-shaped roller stand and pivotable about a vertical pivot axis. The pivot axis intersects the axis of rotation of the lower roller at right angles and is located at a considerable distance from the rolling surface of the roller. A pair each of transverse stabilizing rollers are arranged upstream and downstream of the processing unit made up of the three rollers pairs mentioned. The axes of the stabilizing rollers extend slightly obliquely with respect to the transverse direction which is at right angles to the intended direction of movement of the saw blade so that the back of the saw blade is kept in constant engagement with longitudinal guide means. The pressure exerted by each pair of stabilizing rollers is adjustable by means of an hydraulic cylinder each. The longitudinal guide means for the back of the saw blade are designed to act as curvature measuring station.
The back of the blade in the present context and below is meant to define the edge remote from the teeth of a saw blade formed with teeth along one side only. Yet this is not intended to exclude--at least not in conjunction with the instant invention--saw blades with serrations along both sides for band saws and gang saws as well. With such saw blades, it is one of the two serrated edges instead of a smooth tooth back which is scanned to see if and how the saw blade is buckled in its plane and whether it deviates from the envisaged direction of movement.
The causes bringing about the tension profile and the principles of correcting it by rolling are known; reference is made in this respect to AT 342 385 B1 in addition to DE 42 14 784 A1 already mentioned above.
It is the object of the invention to develop an apparatus of the kind in question such that the aims indicated will be accomplished in a simpler and particularly reliable manner, namely the rolling aimed at correcting the tension profile and the back curvature and also at removing distortions of the saw blade as well as the transverse stabilization of the saw blade as a prerequisite for correctly carrying out the operations mentioned.
According to the invention, all the aims listed are accomplished by the rolling station which, as usual, need only comprise one pair of rollers.
Advantageous further developments of the invention are presented in the subclaims.
An embodiment of the invention will be described in greater detail below, with reference to diagrammatic drawings, in which: comprising a plurality of stations, among them a rolling station for advancing saw blades and for correcting the tension profile and the back curvature as well as for removing distortions from the saw blades; station; III--III of FIG. 4; of FIG. 3; and
The machine shown is devised for automatically straightening elongate saw blades 10. In FIGS. 1 and 2 an endless saw blade is indicated with teeth 12 formed along one longitudinal side and a smooth edge 14, usually referred to as back of the blade at the op
REFERENCES:
patent: 971841 (1910-10-01), Hibbert et al.
patent: 2623414 (1952-12-01), Senard
patent: 3919900 (1975-11-01), Allen et al.
patent: 4852430 (1989-08-01), Oppliger et al.
Beck Ernst
Lenard Peter
Browning Clifford W.
Payer Hwei-Siu
Vollmer Werke Maschinenfabrik GmbH
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