Patent GB-360536-A (GB)
Title: Method of and device for the manufacture of knotted carpets and the like
IPC: D03D39/02
Filed: 1930-08-26
Abstract: 360,536. Looms for weaving knotted pile carpets &c. SMYRNA-AUTOMAT GES., Zittau, Saxony, Germany. Aug. 26, 1930, No. 25452. Convention date, Aug. 27, 1929. [Classes 142 (ii) and 142 (iii).] In a loom for making carpets and wherein tuft or pile threads are secured to the warps by Turkey or Persian knots &c., the pile threads &c. 64, Fig. 8, pass through eyes &c. in setter or selector levers 56, which may be in the form of a typewriter keyboard and be hand controlled, or otherwise, and the act of moving one of these levers into operative position to place its projecting tuft in position to be engaged by the withdrawing nippers sets into operation the knotting devices in a frame K, Fig. 4, and also mechanism of a particular form described below for feeding the knotter across the loom. In the form shown, a single knotter frame is suspended by a stirrup from a rod 26 provided with axles 25 having wheels &c. 16 running on rails 14, 15 across the whole breadth of the loom, but several knotters may be used running on the same rails, tended by separate persons, and controlled by separate keyboards. They may be driven by separate motors or through separate clutches from one shaft. After the completion of knots, the rails 14, 15 and the knotter &c. supported thereby are raised by lever mechanism described to provide clearance for the beat-up movement of the lay. Pile tuft supplying, and selecting devices. The pile threads 64 pass from bobbins on a frame attached to the stirrup through guide eyes on this frame to guide eyes 62, 63, Figs. 8 and 9, on the setter levers 56 movably mounted like typewriter keys on a frame 54 attached to the knotter frame, and operated by pins 66 from corresponding key levers 65, depression of one of which causes the corresponding setter lever to move so that the tuft projecting from its lower end is in position to be gripped by the withdrawing gripper of the knotting mechanism, when this is moved into operative position. The operative setter lever is guided into correct position by a funnel shaped guide 69 and a stop 68. Depression of a key may close the electric circuit operating the motor driving the knotter &c., or operate a clutch between the main shaft and the shaft driving the motor, and all the keys may co-operate with a single member for operating this clutch. A pattern drawing may be arranged on a frame above the lay to assist the operator in determining which key to depress and each setter lever may be provided with a looking device to retain it in operative position after it has been depressed until released by the depression of another key, so that when making a carpet having several adjoining knots of the same colour, the operator needs only to operate a key when the colour changes. The levers 56 may be operated by jacquard mechanism. Feeding the knotting devices. The knotter frame K is fed step by step across the loom by the cooperation of the reed 28 with a toothed bar or fixed advancing foot 31 fixed on a member on the frame K and a second toothed bar 32, which is attached by a cross-bar 33 to two links 34, 35 coupled by universal joints to the axle 26. The frame is so weighted that normally the foot 31 is in contact with the reed 28 whereby it is held firmly whilst a tuft is knotted around two warp threads. Thereafter the foot 32 is swung into contact with the reed by the action of the link 34, a rod 38, and an eccentric 37 on the shaft 36 of the knotting device, whereby the frame K and foot 31 are withdrawn. Then the foot 32 is moved sideways in the direction of the arrow 11, Fig. 2, the distance of a knot by adjustable throw means described operated by an eccentric 39 on a shaft 41 driven from the shaft 36, whereby the frame is moved forwards the distance between two reed dents and afterwards the foot 32 is withdrawn and the foot 31 is engaged with the reed. The closeness of the knots can be varied by exchanging the reed 28 for one with a different dent spacing and replacing the teeth of the.advancing feet 31, 32, which are removable as shown in Fig. 6, by teeth corresponding to the fresh reed. The shaft 41 can be driven in both directions, so that when the end of a row of knots is reached, the frame K can be returned step by step in the reverse direction during the knotting of the next row. A modification is described wherein the knotting device is provided with two movable advancing feet. After a row of knots has been completed, the frame K and other parts running on the rails 14, 15 are tilted to withdraw the feet 31, 32 from the reed, and are held in this position by a catch. Afterwards the rails &c. are raised whilst the lay beats up. After a setter tube has been moved into operative position the shaft 36 is operated and first causes the tuft or pile thread withdrawing grippers to move into position in front of the guide 'channel 69, Fig. 9, and grasp the tuft thread, which is then cut off by shears. Knotting pincers then knot the tuft around two separated warp threads and then the knotting frame is fed into position to co-operate with the next two warp threads. Reeds. The reed dents are strengthened at the parts where they are engaged by the feet 31, 32 by means of a bar 51 bound to the dents by a thin wire.