Patent GB-190107317-A (GB)
Title: Improvements in Book Sewing Machines.
Inventor: TREVETTE WENTWORTH GEORGE
Filed: 1901-04-09
Granted: 1901-05-25
Abstract: 7317. Trevette, W. G. April 9. Book-stitching machines.-Consists of an improved machine in which the signatures are carried by feed-arms into position under a gang of semicircular needles which sew lines of interlocked knotted stitches, and are then delivered under a frictional resistance, so that it is possibly easily to separate the complete books. Work-supports; feed.-Fig. 9 shows a transverse section. Each feed-arm D traverses an irregular curved path. In the course of this movement, the arm pauses momentarily, in line with a fixed saddle from which a signature can thus be pushed on to it by a single movement of the operator's arm. The feed-arm then carries this signature under the needles, and holds it in position during the sewing. Two such arms are provided, one of which is receiving a signature, while the other is under the needles, and vice versÔ. Each arm is carried on rods guided horizontally in vertically-movable rods, the two sets of rods being reciprocated by separate cams. The pile of sewn signatures is supported edgewise on a vertically-adjustable table, and, as each is sewn, is forced to the right by packersprings 65 against the resistance due to the wedging of the signatures under the inclined and stepped face 63 of a fixed plate 29. The springs 65 are carried by a bar 28 reciprocated by a connection with the feed-arms. Needles; perforating-devices.-The needles are in pairs, the two of a pair, Fig. 12, being mounted side by side on a common axis and pointing in opposite directions. On the heel of each is a punch p set centrally between the planes of the needles. The combined needle and punch is preferably made from a single piece of wire. Knotted-stitch machines; double -loop stitching- machines; multiple-needle machines; needle-driving. -Each pair of needles produces two lines of sewing, the knot in one signature being formed in one line, and that in the next in the other line, Fig. 5. The needles c are secured to sleeves g concentric with the shafts d of the needles b, and the shafts and sleeves are oscillated by racks j, k respectively. The needles b, c operate alternately on successive signatures, and to effect this, after the holes have been punched in a signature by a reverse movement of all the needles, the needles are moved laterally by a lateral movement of the bar e so that the needles which are to sew are in the plane normally occupied by the punches. Fig. 10 shows in plan the means by which the lateral movement of the bar e is obtained from the racks k, j. Two or more sets of arms r, s on the racks carry pins engaging cam-grooves t, u in the bar e of the shape shown. Knotters 22, 25 co-operate respectively with the needles b, c. The knutters move in a path perpendicular to the plane of the needles, and pause at one part of their movement. Their movement is obtained from a pair of bars laterally movable on another pair moved longitudinally. The forward movement of the knotters is positive, but their rear movement is imparted through a spring so as to Le yielding. The loopers 1, one for each pair of needles, are pivoted eccentrically in a bar 2, which can be moved both laterally and longitudinally, and carries a rack 3 by which the loopers are oscillated. The loopers have a rear-pointing slotted hook, Fig. 5. In operation, the needle in action, say b, penetrates a loop 19 held by the looper and emerges at the other hole. The looper meanwhile casts off the loop 19, penetrates the loop on the needle b, Fig. 5, and draws back through it the thread 24 extending between the needle c and the last-formed knot. The needle b then retires, the knot at 17 is drawn tight by the combined action of the knocter 22 and take-up, and the looper 1 turns into position for the needle c to penetrate the loop 24, in the same way that the needle b passed through the loop 19. Governing needle thread.-All the threads pass over a common take-up bar 74, Fig. 9, and each thread has an independent take-up spring 80.