Glass scoring machines
OwnerRobert E. Rockinventor
Life of this patent
Estimating the term…
Abstract
Glass scoring machines for breaking glass along the lines of intricate patterns employing an intermittent feed dog glass advancing mechanism beneath the glass and a spring loaded glass scoring tool supported above the glass. Optionally includes a tapping device for periodically striking the scored glass to facilitate subsequent breaking along the scored line. May also be practiced as a sewing machine attachment for scoring or cutting glass or like material by selectively utilizing sewing machine mechanism without adversely affecting the normal operation of the sewing machine upon removal of the attachment.
Claims16
A removable attachment for converting a sewing machine of the type having a presser bar and movable feed dog means into a glass scoring machine for scoring glass along predetermined pattern lines, said attachment for attaching to said presser bar at the end proximate to said feed dog means, said attachment comprising:
- presser bar attaching means and glass scoring means attached to said presser bar attaching means, for positioning said glass scoring means against the upper surface of a vitreous workpiece placed beneath said presser bar and over said feed dog means when said attachment is attached to said presser bar, to score said workpiece along said pattern lines as said workpiece is advanced by the action of said feed dog means, said presser bar attaching means including:
- a. a clamping means, said clamping means having a first, releasing condition and a second, securing condition;
- b. a presser bar receiving channel means connected to said clamping means for freely engaging and disengaging said presser bar when said clamping means is in said first condition and for securing said presser bar in said channel so tightly that said attaching means does not move relative to said presser bar when said glass scoring means is scoring said workpiece and when said feed dog means is advancing said workpiece, when said clamping means is in said second condition;said glass scoring means including a sharp-edged disc of hard material of radius less than the thickness of said workpiece for scoring the upper surface of said workpiece, said disc mounted upon axle means so as to be freely rotated by frictional engagement by said workpiece during advancement by said action of said feed dog means, said disc being free from any connections other than said axle means;
- and said axle means fixedly connected to said presser bar attaching means.
A vitreous material scoring machine for scoring the upper surface of vitreous material accurately along intricate pattern lines with a glass scoring means comprising:
- a. work surface means for supporting said vitreous material, said work surface means having an aperture for feed dog means;
- b. feed dog means operatively connected beneath said work surface means so as to cyclically and repetitively perform the following orbital motion:
- (1) rise up through said aperture means above the plane of said work surface means
- (2) move translationally a short distance
- (3) lower down through said aperture means below the plane of said work surface means
- (4) move translationally the same short distance in the opposite sense to motion (2) to return to original starting position;
- c. presser bar means adapted to hold said glass scoring means against the upper surface of said vitreous material with controlled bias in a first presser bar position and further adapted to hold said glass scoring means high enough above said vitreous material as to permit convenient positioning of said vitreous material in a second presser bar position;
- d. presser bar support means operatively connected to said work surface means and said presser bar means;
- e. power means connected to said feed dog means to drive said feed dog means repetitively through said motion, wherein said motion of said feed dog means causes said vitreous material to be fed beneath said glass scoring means in a plurality of short translations while said vitreous material is also lifted to provide a more controllable scoring action against its said scoring means;
- wherein said short translatory distance is a fraction of a centimeter.
Dependencies are inferred from the claim text.