Slide-fastener cut-apart means controlled by work sensing means

Claim 1

AN AUTOMATIC SLIDE-FASTENER CHAIN CUT-APART MACHINE COMPRISING, IN COMBINATION: MEANS DEFINING A STRAIGHTWAY EXTENDING GUIDEWAY FOR A CONTINUOUS SLIDE-FASTENER CHAIN CONSISTING OF A PAIR OF ELONGATE FLEXIBLE TAPES SECURED TOGETHER ALONG ADJACENT EDGES BY A SUCCESSION OF SPACED-APART GROUPS OF INTERENGAGED FASTENER ELEMENTS AND WITH THE EDGES OF THE TAPE LENGTH-PORTIONS WHICH EXTEND BETWEEN SAID GROUPS DEFINING GAPS; A CUT-APART BLADE RECIPROCABLE IN A PATH INTERSECTING SAID GUIDEWAY; MEANS FOR RECIPROCATING SAID BLADE INTERMITTENTLY; MEANS DRIVEN BY SAID LAST MEANS FOR POSITIVELY FEEDING SAID CONTINUOUS SLIDE-FASTENER CHAIN ALONG SAID GUIDEWAY TO THE ACTION OF SAID BLADE; AND MEANS FOR CONTROLLING ACTUATION OF SAID BLADERECIPROCATING MEANS AND SAID FASTENER-CHAIN FEED MEANS WHEREBY THE BLADE IS ACTUATED THROUGHOUT EACH OF ITS WORKING STROKES ONLY WHEN THE FEED MOTION OF THE CHAIN IS ARRESTED AND THE THEN MOST ADVANCED GAPPED-LENGTH PORTION OF THE CHAIN IS DISPOSED IN SAID GUIDEWAY IN POSITION AS TO BE ACTED UPON BY SAID BLADE, SAID MEANS INCLUDING A GAP-SENSING FINGER DISPOSED TO THE FEED-IN SIDE OF SAID BLADE AND DEPENDING INTO THE GUIDEWAY AND POSITIONED THEREIN SO AS NORMALLY TO RIDE ON THE INTERENGAGED FASTENER ELEMENTS OF THE SUCCESSIVE GROUPS THEREOF MOVING ALONG SAID GUIDEWAY;