Carpet-knotting apparatus

Apparatus to tie Smyrna stitches called Ghiordes knots on a canvas, comprising, on the one hand, a head which presents a nose and two cheeks delimitating two lodgings between them and said nose, the back part of the head being arranged to receive the mid portion of a pile thread of predetermined length, while the portions of that thread, adjacent to that mid portion, are imprisoned in said lodgings so that the ends of that thread extend in front of the head in approximately parallel directions, that head being solid with a guiding rod and its nose carrying a rigid buckle intended to pass between two threads of the canvas in the course of a first movement of engagement of the apparatus, and, on the other hand, a unit movable along said rod, between a position of rest and an engaged position, that unit carrying two hooks which are located in different planes, parallel to each other and move in those planes, when said unit moves from its position of rest to its engaged position and vice versa, which are guided by said head and which, in the course of a supplementary movement of engagement, leave their position of rest, cross the canvas by passing through openings of the latter, located on either side of the two said threads between which the buckle of the apparatus has been engaged, and finally cross each other in said buckle, when they reach the engaged position, those hooks being intended, in the course of their displacement, for seizing the portions of the pile thread imprisoned in said lodgings and, while sliding along said thread toward its ends, for causing the ends to pass through said openings of the canvas in order to finally deposit them in said buckle, which, in the course of the disengagement of the apparatus, pull those ends of the pile thread between the two said threads of the canvas, characterized in that the parts (16a, 17a) of the hooks (16, 17), which seize the portions of the pile thread (23) imprisoned in said lodgings (4, 5), are not at the same distance from those portions of the pile thread, so as to seize them one after the other, during the supplementary movement of engagement of the apparatus, to cause the ends of that thread (23) to successively pass through the canvas and to engage them one after the other into said buckle (8), when coming near their engaged position.