Apparatus for centering sheets of glass on the platform of a machine

Apparatus for centering sheets of glass and the like on the platform of a machine for finishing the edges or surface of the sheet including a plurality of centering pins movable into contact with the sheet at spaced points on the periphery thereof, and drive mechanism for said pins which comprises a frame, a pin-carrying support carrying at least one of the pins and being mounted on the frame for movement between a rest position situated away from the platform at which the pin is turned down below the plane of the sheet on said platform and a second position situated adjacent said platform wherein the pin and support are moved to an upright position so that the pin engages the edge of the sheet, drive means connected to said support for turning said support and pin to the upright position whenever the support is advanced toward said platform and for retracting the support away from the platform, to thereby turn the pin and the support down to their rest position, guide means for guiding said support during said turning, advancing and retracting movements, and adjustable stop means for limiting the advance of said support toward the platform, said guide means includes roller means mounted for rotation about a fixed axis with respect to said frame, and said pin-carrying support includes two guide planes having an included angle equal to the angle between the upright and rest positions of the pin, said guide planes and said roller means cooperating to turn the support from the rest to the upright positions of the pin and vice versa during the advancing and retracting of the support.

Apparatus for centering sheets of glass and the like on the platform of a machine for finishing the edges or surface of the sheet including a plurality of centering pins movable into contact with the sheet at spaced points on the periphery thereof, and drive mechanism for said pins which comprises a frame, a pin-carrying support carrying at least one of the pins and being mounted on the frame for movement between a rest position situated away from the platform at which the pin is turned down below the plane of the sheet on said platform and a second position situated adjacent said platform wherein the pin and support are moved to an upright position so that the pin engages the edge of the sheet, drive means connected to said support for turning said support and pin to the upright position whenever the support is advanced toward said platform and for retracting the support away from the platform, to thereby turn the pin and the support down to their rest position, guide means for guiding said support during said turning, advancing and retracting movements, and adjustable stop means for limiting the advance of said support toward the platform, said guide means incudes two rectilinear guides fixedly mounted on said frame, and said pin-carrying support includes rollers cooperating with said rectilinear guides respectively, said pin-carrying support pivoting about one of said rollers during said advancing and retracting thereof.