Metal tools and implements – making – Saw-making or furbishing device or machine – Clamp
Patent
1992-12-30
1994-03-29
Parker, Roscoe V.
Metal tools and implements, making
Saw-making or furbishing device or machine
Clamp
B23D 6300
Patent
active
052974553
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a saw blade clamping device for saw finishing machines, comprising a stationary clamping jaw and a movable clamping jaw which is hingedly connected to a bracket and adapted to be fastened in clamping position in which it presses a saw blade against the stationary clamping jaw.
The designation of a clamping jaw as being stationary in the present context is meant to express that the clamping jaw adopts a certain position at a saw finishing machine during the entire finishing work on a saw blade and usually also for a plurality of successive identical saw blades. This does not exclude, however, that the stationary clamping jaw is adjustable for resetting of the saw finishing machine, for example for purposes of adaptation to saw blades of different thickness or different depth of tooth.
It has been common for a long time to clamp saw blades between a stationary clamping jaw, in the sense explained above, and a movable clamping jaw as close as possible to a finishing station where, for instance, tooth surfaces are ground so that accurate machining largely without vibrations becomes possible. The clamping force normally is selected so that the friction it generates will prevent any unintentional displacement of the saw blade, while the required advancing movements remain possible without opening of the clamping device.
With known saw blade clamping devices (DE-PS 874 551) the movable clamping jaw is disposed at a carrier lever which is supported by a bracket on a horizontal axis, can be locked in a vertical clamping position, and is pivotable forwardly in downward direction from this clamping position towards the user. Therefore, the carrier lever needs a lot of space in the area in which the user should be able to move without obstruction, if at all possible, in order to place a respective new saw blade in the clamping device, set the corresponding finishing machine, and take out the finished saw blade. Particularly the handling of bigger circular saws or band saws for which a hoisting means is needed can be rendered quite a bit more difficult by a downwardly turned carrier lever because the user must concentrate on controlling the hoisting means and the motions of the saw blade caused by it, rather than paying the foremost attention to not hitting the carrier lever.
It is, therefore, the object of the invention to improve a saw blade clamping device such that it will cause the least possible obstruction to the user when he introduces or withdraws a saw blade into or from a saw finishing machine and when he sets the machine.
The object is met, in accordance with the invention, starting from a saw blade clamping device of the kind specified initially, in that the movable jaw is supported on a support member which is guided for displacement at the bracket by a flat guide means to cause slightly arcuate movement, deviating only a little from the plane of the saw blade, of the movable clamping jaw away from the stationary clamping jaw, which support member further is adapted to be clamped to the bracket and is connected to the same in addition by a four-joint arrangement.
When the clamping jaw is opened, as a result of this arrangement, the movable clamping jaw initially does move away from the plane of the saw blade, at the start of its slightly arcuate movement, so as not to get stuck at any set or thickened tooth tips, such as teeth that have been upset or provided with hard metal tips. Then, however, on its way away from the saw blade, it moves away only very little from the plane of the saw blade. In similar manner, the movable clamping jaw approaches its own closing position in a flat path upon closing of the clamping device so that it will always just barely be spaced from the plane of the saw blade so as not to hit against a tooth in case the saw blade should be warped. Consequently the saw blade clamping device according to the invention requires only little space in the user's working area to carry out its opening and closing movements.
The flat guide means may comprise two paral
Lenard Peter
Reimann Hans-Joachim
Riehlein Fritz
Parker Roscoe V.
Vollmer Werke Maschinenfabrik GmbH
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