Patent GB-190407615-A (GB)
Title: Improvements in Pattern Mechanism applicable to Looms.
Inventor: PANITSCHEK HEINRICH
Filed: 1904-03-30
Granted: 1904-07-21
Abstract: 7615. Panitschek, H., and Ahorn, J. March 30. Shuttleless looms; openwork fabrics.-In looms, particularly for producing a preliminary pattern fabric for use in weaving carpets in the manner described in Specifications Nos. 13,358 and 13,359, A.D. 1899, in which fabric the weft threads are held loosely between two pairs of doube-twisted warp threads at suitable distances apart to facilitate a ready grasping and drawing-out of the weft threads, the pattern mechanism for effecting the selection of the weft threads comprises hollow thread-guides 2 mounted on pivots 3 of a frame 4 in the form of a hollow cylinder about a common centre line. Each guide 2 is connected by an adjustable connecting-rod 6 to one of a series of keys 5, which are arranged on shafts 9, so that, when the key is depressed, the guide is moved against the action of a spring 8 into the centre line and opposite the weft-carrier, which grips the protruding end of weft 1 and draws it through the shed. The weft-carrier may consist of tongs reciprocated in guides and opened at the proper times in the usual manner by means of stops. In the arrangement shown in Fig. 6, the thread-guides 2 are operated indirectly by the keys by means of an endless pattern chain a moving over cylinders 19, 20. Each card of the chain a contains a number of rotary tappets 22 corresponding to the thread-guides, and mounted on a central axle 21. The tappets are normally in an inclined and inoperative position I, and, when a key 5 is depressed, the preferably elastic lower end 23 of the key bar 24 is moved into the path of the corresponding tappet 22, which by the movement of the chain is moved up into its operative position II. The cylinder 19 is intermittently rotated by means of a star-wheel 30 operated upon by pins 31 on a worm-wheel s in engagement with a worm 34. The worm is mounted on a tubular shift 35, surrounding a fixed axle 40 and carrying the male cone 36 of a clutch, of which the hollow cone 37 is mounted on a driven tubular shaft 38. When a key 5 is depressed, a wedge-shaped nose 71 on the key bar 24 strikes a flap 70 and rocks arms 69, 67, so that through a rod 66 a bell-crank lever 64 is turned, allowing a shoulder 62 on a pivoted arm 60 to be disengaged from a notch 63 in the lever 64. A bar 48 which is pressed to the left by a spring 49 turns the arm 60 upwards until the shoulder 62 engages in a higher notch 65. The movement of the bar 48 throws the clutch into gear through a clutch lever 45, and the cylinder 19 is rotated. A nose 55 on a locking- lever 52 is forced out of a notch 57 in a disc attached to the worm-wheel s. The other end of the lever 52 is lowered against the action of a spring f, so that a shoulder 53 engages over a projection 54 on the clutch lever, which is thereby locked. The bar 48 is moved to the right by one of the tappets 51 of a wheel d fixed to the wormwheel a without moving the clutch lever 45 or throwing the clutch out of gear, until a nose 58 upon it strikes against a tappet 59 on the arm 60, and moves the latter downwards. A hook 61 moves in front of the end of the bar 48, and keeps it to the right. By the downward movement of the arm 60, one end of a rocking piece 73 is pulled down through a rod 72, so that a bar 74, carried by it and extending the whole width of the cards, is moved towards the card a', and turns the upright tappet thereon back into its inclined or inoperative position. At the same time, a bar 75 connected to the piece 73 moves a bell crank 76 having a downwardly-extending arm, which releases the flap 70, so that the depressed key bar may be moved up by a spring. The springy lower end 23 of the key bar 24 is held in position during the upward movement of a card tappet by a bar 78 on a shaft 77, which carries an arm 79 connected to the piece 73 by a rod 80. The worm-wheel s is rotated until the nose 55 is snapped into the next notch 57 in the disc by the action of the spring f. The clutch lever 45 is released, and, since the bar 48 has been moved to the right, the lever 45 is free to be acted upon by a spring 44 which disengages the clutch by moving the hollow cone 37. A spring 43 moves the tubular shaft 35 so that the cone 36 is pressed against a cone 41 on the fixed axle 40, and the motion of the cylinder 19 is instantly stopped. When a key is depressed, the operations are repeated. The prepared cards pass to the cylinder 20, above which are arranged levers 81 corresponding in number to the thread-guides 2. The levers 81 are mounted on a common rod 82, which is moved up and down by means of a lever 83 actuated by a grooved cam 85. As the levers 81 are moved towards the cylinder 20, one lever strikes the upright tappet of the card, whereby the free end of this lever is raised into the position 81<1> in which it can be engaged by a rocking piece 86, actuated through a rod 87 by a grooved cam n, and the lever is raised still further into the position 81<1> by the simultaneous rise of the shaft 82. A bell crank 88 connected to the lever acts through a connecting- rod to move the corresponding thread-guide 2. Two fixed studs engage into suitably-formed slots in a plate 90 attached to the guide, so that the thread-guide is first rotated inwardly and then pushed forward so that the weft end projects towards the shed. In order to arrange the wefts in the pattern fabric into groups, provision is made for making an idle pick, the weft-carrier passing empty through the shed. A key is provided having a bar 24 which has no prolongation 23, so that it cannot affect the cards. When the idle key is depressed, the cylinder 19 is partially rotated in the same manner as when the other keys are depressed. The card corresponding to the idle pick has a fixed tappet, which at the proper time strikes against a spring 95 and moves an arm 97. A bar 98 which normally locks the idle-key bar, or a guide-bar 99 connected thereto, is moved to the left by the arm 97, releasing the idle-key bar and locking all the guide-bars corresponding to the working keys.