Patent GB-191206585-A (GB)
Title: Improvements in or connected with Pick Finder Devices for Looms.
Inventor: SEFTON-JONES HERBERT
IPC: D03D45/34
Filed: 1912-03-16
Granted: 1913-06-16
Abstract: 6585. Jones, H. Sefton-, [Jackson, S. S.]. March 16. Weft-replenishing mechanism.-In looms provided with a single index dobby or like shedding- mechanism, weft-fork devices 21, 22, Figs. 1 and 2, at the respective sides of the loom control pick-finder devices, whereby, after weftfailure has occurred, the pattern mechanism is so adjusted that the fresh weft is introduced into a re-opening of the shed containing the failed pick. The weft-detector devices operate automatic weft-replenishing mechanism (shuttlechanging or bobbin-changing), or, as illustrated, both stopping-mechanism and shuttle-changing mechanism, the loom being stopped with the shuttle always on the same side. If the weft should fail on a pick to the driving side, the weft-fork slide 22 at that side is advanced, a pawl 45 pivoted on a stud connected to this slide then engaging an arm 36 to cause weftreplenishment &c. to occur as described below, while the slide rocks an arm 30 fast to a shaft 31. A projection 72 on an arm 73 fast to this shaft then operates a pick-finder lever 61, controlling mechanism for re-setting the dobby pattern cylinder. The shaft 31 is provided with a lug to operate the shipper 34 and stop the loom, the momentum of the loom causing stoppage to occur only after the return pick to the replenishing side. The arm 36, by means of a flexible connexion 38, disengages a latching-lever 39 from a stop 41, whereby a changeshaft 40 is caused to be rotated. This shaft first causes shuttle-changing to occur and then causes the loom to be re-started, the fresh shuttle being picked into the proper shed on account of the action of the pattern - cylinder re-setting mechanism. If the weft fails on a pick to the replenishing side of the loom, the weft-fork slide 22 at that side is advanced, but only operates mechanism associated with the pattern-cylinder re-setting mechanism. After the next pick (to the driving side), the weftfork slide 22 at that side is advanced and causes the operation of the loom-stopping and weftreplenishing mechanism, the loom continuing to run, as before, until the pick to the replenishing side has been made, and the pattern cylinder being re-set so that the fresh shuttle is picked into the correct shed. In order to prevent actuation of the weft-fork mechanism 21, 22 at the replenishing side after the first beat-up following replenishment (when no weft is in position to engage the weft-fork 21), a finger 78<a> extending from the dog 78 is linked to a connecting- rod 95 connected to a lever operated by a cam 97 on the change-shaft 40. Towards the close of weft-replenishment, the dog 78 is thereby raised and does not engage the lever 61 on the first beat-up after replenishment, the changeshaft continuing to rotate for a small period longer and allowing the dog 78 to drop down to normal position. The shipper shaft is provided with an arm 45<b>, which is normally free of a finger 45<a> on the dog 45 but engages and raises this dog from the arm 36 when the shipper is moved to its normal ' off ' position, thus preventing accidental operation of the replenishing- devices and consequent re-starting of the loom. In a modification, the pick-finder lever is fixed or the rock-shaft 31. both weft-fork devices being operative to rock this shaft so that they both control replenishment, and the cams of the weft-fork hammers being specially shaped to cause such weft-replenishment &c. to occur at the same time in both cases.