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Turn-around-mechanism-for-workpieces-in-grinding-machines

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Details

Inventors: Janutta, Reinhard;
Assignee: Hauni-Werke Korber & Co. KG (Hamburg, DE)
Primary Examiner: Schmidt; Frederick R.
Assistant Examiner: Rachuba; Maurina
Attorney, Agent or Firm: Kontler; Peter K.

A grinding machine for workpieces having pairs of surfaces which are disposed opposite each other and each of which must be treated by the grinding wheel has one or two inverting heads each of which can removably receive one end portion of a workpiece so that the two surfaces of the workpiece remain exposed. The inverting heads can be turned in synchronism through 180 degrees between first positions in which the first surface of the workpiece can be treated by the grinding wheel and second positions in which the grinding wheel can treat the second surface of the workpiece. The inverting heads are further movable to intermediate positions in which a finished workpiece can be replaced with a fresh workpiece. Several workpieces can be accumulated into a stack which is inserted into a cassette and the latter confines the stack during introduction into, movement in and evacuation of stacked workpieces from the grinding machine. The inverting heads are turned by pairs of arms which are articulately connected to the respective inverting members and to a work support which is movably installed in the frame of the grinding machine. The workpiece or workpieces rest on the support during treatment of their surfaces by the grinding wheel.

DETAILED DESCRIPTION I claim: 1.
A machine for removing material from consecutive workpieces of the type having pairs of surfaces to be treated and wherein such surfaces are disposed opposite each other, especially for grinding consecutive stacks of twin-bladed knives for use in hedge trimming apparatus and the like, comprising a rotary material removing tool; a support having a work supporting face; and a mechanism for inverting consecutive workpieces with reference to said support so that the treatment of one surface of the workpiece resting on said support can be followed by the treatment of the other surface of such workpiece, comprising a turn-around device including at least one inverting member having means for engaging consecutive workpieces outside of said surfaces of the engaged workpiece and to hold the engaged workpiece in cantilever fashion, and drive means for moving said inverting member and the workpiece which is held by the inverting member between a first position in which one surface of the engaged workpiece is in a position to be treated by said tool and a second position in which the other surface of the engaged workpiece is in a position to be treated by said tool, said drive means defining for the movement of said inverting member a path wherein said inverting member is remote from said work supporting face and is caused to turn about a predetermined axis which is at least substantially parallel to said face, said drive means comprising a pair of arms, first pivot means articulately connecting said arms to said inverting member for angular movement about discrete first and second axes, second pivot means articulately connecting said arms to said support for angular movement about discrete third and fourth axes which are parallel to said first and second axes, and means for pivoting said arms about the respective axes.
2.
The machine of claim 1, wherein said drive means includes link means defining said path, said inverting member being arranged to turn the engaged workpiece through an angle of 180

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