Patent GB-190703758-A (GB)
Title: Improvements in and relating to Automatic Looms.
Inventor: BRIOT ALBERT
Filed: 1907-02-15
Granted: 1908-01-09
Abstract: 3758. Briot, A. Feb. 15. Loom shuttles, changing bobbins in, automatically; shuttle-relief motions; shuttle boxes ; shuttles; stopmotions ; weft, cutting. - Relates to the bobbincbanging mechanism described in Specification No. 13,831, A.D. 1904. The front and the back of the shuttle box have openings of the same size as an opening in the shuttle, to allow the entrance of a full bobbin and the discharge of the empty bobbin. The back of the box is provided with tongues 3, 4, Fig. 1, to check the shuttle and to prevent its rebound. A suitable part of a spring 5 is acted upon by the connecting-rod in such a manner that the spring is moved to press the tongue 3 inwards when the shuttle is entering the box, while the pressure is removed when the shuttle is about to be picked. The tongue 3 may be shaped as shown, or it may be formed like a detent to engage a notch in the shuttle. The tongue 4 assists in checking the shuttle. The bobbin head may be rectangular or circular, and is held in the shuttle between side plates 7, Fig. 9, provided with flanges 8. A spring plate 9, or a spring-pressed pivoted lever, is adapted to engage a groove 10 in the bobbin head to hold it in position in the shuttle. The bobbin magazine comprises two slides 20, 21, Fig. 1, which receive the tips and the heads of the bobbins, respectively, and a rib 21<1> engages in grooves in the bobbin heads to hold the bobbins in the proper position. The bobbin feeder is mounted on a shaft 24, of which the inner end is rotatable in a socket 26 on the shaft 25, which is rocked by the weft-fork mechanism when a change of bobbin is to be effected. The shaft 24 is connected to the socket by a helical spring 27, so that it is rocked yieldingly by the shaft 25. The feeder comprises two sides 28, 28<1> connected by a part 29, a shaft 30 loosely mounted in bearings 43 and acted upon at its ends by springs .77, and sides 31, 31<1>. secured to the shaft 30 and connected by a bar 32. The sides 31, 31<1> are provided with clips for receiving the tip and the head of a bobbin from the magazine, and a spring- pressed finger 37 assists in holding the tip when the feeder is lowered into the charging position. A helical spring 33 is secured at one end to the side 31 and at the other end to a piece which is loose on the sbaft 30 and engages a groove in the part 29. The two parts of the feeder form a knee or angle joint, and the spring 33 tends to increase the angle between the parts, the said increase of angle being limited by stops. When the shuttle is in the proper position in the box, the tongue 4 is moved outwards, and an arm 6 attached to the tongue is moved under an arm 46 on a rock shaft 44, which has an arm 45 opposite the bearing 43. When the feeder is lowered into the charging position, and the lay moves forwards, one of two fingers 40 on the feeder engages an incline 74 or 74' in the shuttle, so that the shaft 30 is moved longitudinally, against the action of a spring 77, if this movement is necessary to bring the head of the full bobbin exactly opposite the head of the empty bobbin in the shuttle. The bearing 43 engages under the arm 45 and is thereby prevented from moving upwards, so that bending ot the feeder is prevented, and the full bobbin pushes out the empty bobbin and takes its place in the shuttle. The tail of the finger 37 engages the end of the opening in the front of the shuttle box, so that the finger is turned on its pivot and discharges the tip of the empty bobbin. One of the fingers 40 strikes the end 18 of a pivoted lever 13 in the shuttle, so that the end 17 is raised. The lever is held in this position by a spring 15, and the weft of the new cop, passing through a perforation in the bobbin tip and attached to the loom frame, is engaged below the end 17 as the shuttle is picked. When the shuttle arrives at the opposite box, the shock returns the finger 13 to its former position, in which also it is held by the spring 15. When the feeder is raised again, it forces back spring detents 22 from urder the bobbins in the magazine, and a new bobbin is placed in the feeder. If a finger 40 meets the wood of the shuttle during the bobbin-changing operation, the bearing 43 has not yet reached the arm 45, so that the feeder is free to bend at its joint and no damage is done. If the tongue 4 is not pressed out by the shuttle, the arm 45 is free to move against the action of a spring 47, and when the full bobbin strikes the wood of the shuttle, the feeder is free to bend as before. The ends of weft from the bobbins in the magazine pass over a support 48 and are wound on a bar 49, which is rotated slightly by ratchet gearing at each operationof the bobbin changing mechanism so that the wefts are kept tight as the bobbins descend in the magazine. In order that the loom may be stopped if an indication for a second change of bobbin is made immediately after a change of bobbin has been effected, a bell-crank lever is pivoted on a support 54, Fig. 4, on the weft-fork holder, and is held normally with its arm 55 horizontal by a spring 57, which engages a notch in the lever. When the weft fork and its holder are moved forwards by the weft hammer, a stop 58 on the breast beam tilts the lever, so that its arm 55 is lowered over a rod 61 attached to the weft-fork lever. When the weft-fork holder is returned to its normal position, the arm 55 remains lowered, and if an indication for a second change of bobbin is made, the arm 55 strikes the rod 61 and stops the loom. If the weft himmer is moved forwards alone, a lug 59 thereon returns the bell-crank lever to its norm position. The loom is provided with weft-cutting apparatus of the kind described in the above-mentioned Specification. An arm 70, Fig. 17, on the shaft 25, on the rotation of the latter, strikes a bolt 67. which encounters a lever 65 on a shaft 62 carried by the lay. The shat 62 has an adjustable socket 63 carrying blades 64, which pass between the reed dents, and when moved down cut the weft from the spent bobbin. On the return of the lay, a spiral spring on the shaft 62 returns the socket and the blades to their normal positions. The arm 70 also returns to its normal position, but the bolt 67 is held by a pawl 68 thereon engaging a notch 69 in a fixed support 66. At the next beat-up of the lay, the weft-cutting device is operated again to cut the weft from the new bobbin, and an arm 71 carried by the lay disengages the pawl 68 from the notch 69, so that the bolt 67 is free to be returned to its normal position by a spring.