Patent GB-190622141-A (GB)
Title: Improvements in or relating to the Feeler Motion and Double Fork Mechanism of Filling Replenishing Looms.
Filed: 1906-10-08
Granted: 1907-06-27
Abstract: 22,141. British Northrop Loom Co., [Northrop Loom Co.]. Oct. 8. Loom weft-replenishing mechanism ; stop-motions; take-up motions.-In an automatic weft-replenishing loom having weft-feeler mechanism to effect weft-replenishment prior to complete exhaustion of the weft, and main and auxiliary weft forks to detect weft failure on alternate picks, means are provided whereby the loom may be operated in four different ways according to the character of work to be performed. The loom may be operated (1) with the weft-feeler and the weft forks effecting weft-replenishment ; (2) with the weft-feeler inoperative, and the weft forks effecting weftreplenishment ; (3) with the weftfeeler effecting weftreplenishment, and the weft forks acting to stop the loom upon weft failure, even if the feeler-mechanism has been previously acted upon to effect weft-replenishment ; and (4) as an ordinary double-fork loom with the weft-feeler inoperative. The weft-feeler 28x, its pivoted transmitter 34x extending under the latch d<3>x, which is pivoted to the arm d<2x> on the rock-shaft d', the main and auxiliary weft forks f, g and their co-operating mechanism including the arms d, d<5>, which are loose and fast on the shaft d<1>, the shipper S, and the knock-off lever Nx are all of ordinary construction, such as is described in Specification No. 12,561, A.D. 1904. The weft-replenishment is effected when the shaft d' is rocked, and this action takes place when the latch d<3x> is raised by the transmitter 34x and is moved forwards by a head w<1x> on the weft hammer W. The operation of the loom is varied by means of a controlling - member 40, which is adapted to be mounted in either of two positions on a lug d<52> on the arm d. The member 40 is secured in position by a spring pin, and is provided with a lug 50 and suitably-disposed notches and shoulders, which effect various operations according to the position of the member. When the loom is to operate as in (1) and (2), the member 40 is so mounted that the lug 50 extends to the left, as shown, under the latch d<3>X. When the weft-feeler is operative, case (1), upon substantial exhaustion of the weft the latch d<3x> is raised and the shaft d' is rocked in the usual manner. A tooth d<5>X on the latch is raised above a notch in the member 40, so that the member is not moved. When weft-failure is detected by the fork f, its slide f<x> is moved forwards and engages a head on the arm d, which is swung outwards and arrests the take-up motion through a lug on an extension of the arm engaging the pawl-carrier and moving the same to disengage the pawl from the ratchet in the manner usual in Northrop looms. At the same time, the member 40 is moved forwards with the arm d, and the lug 50 engages the front end of the latch d<3x>, and moves the latter outwards to rock the shaft d'. When weft-failure is detected by the fork g, its slide g<x> is moved forwards, and through the arm d<5>, the shaft d<1> is rocked far enough to bring the latch tooth d<5x> into engagement with a notch in the member 40, which is thereby moved forwards to swing the arm d and arrest the take-up. A lug on the head of the arm d engages a hook at the end of the usual carrier on the main fork slide f x,which is thereby moved forwards to render the fork f irresponsive to the presence of weft at the next pick. and consequently weft-replenishment will be effected when the complete outward movement of the slider x is accomplished by the weft hammer W. The knock-off lever Nx is not effected by the described movements of the member 40. Means are provided for preventing successive operations of the replenishing-mechanism by the weft-feeler and fork rÚspectively, which operations would take place if the action of the weft-feeler is delayed so long that the weft runs out during the flight of the shuttle to the replenishing side of the loom. Upon such failure of the weft, the fork g detects, and the cam actuating the weft hammer Wx is so constructed that the slide g<x> is moved forwards quickly at the start and is then caused to dwell. When the weft hammer W moves back, the rock-sbaft d<1> is held stationary by the action of the hammer W<x>, and when the forward movement of the hammer W<x> is recommended, the latch d<3>x is drawn forwards, but as the tooth d<5x> has been moved past the notch in the member 40, the latter is not moved forwards, so that there is no second weft-replenishing operation and no arrest of the take-up. If the loom is to operate as in case (2), the feeder 28x is pushed forwards until a hole 100 in its shank 14<x> is exposed at the front of the stand 9x, and a pin is inserted into the hole to keep the feeler inoperative. When the loom is to operate as in case (3), the position of the member 40 is reversed, so that the lug 50 extends to the right behind the head of the arm d, and the end of the lug lies beneath the hook of the carrier on the slide f<x>. The weftreplenishing mechanism is actuated by the weftfeeler in the ordinary manner, and if weft-failure is detected by the fork f, the arm d is moved to arrest the take-up. At the same time, the member 40 is moved forwards, and a shoulder thereon acts upon the end of the lever N<x> to stop the loom. If weft-failure is detected by the fork g, the latch d<3>x is moved forwards far enough to cause the tooth d<5x> to engage a notch in the member 40, which acts upon the lever Nx as described above. The forward movement of the member 40 acts through the arm d to arrest the take-up. A camface on the lug 50 lifts the hook of the carrier out of engagement with the lug on the head of the arm d, thus preventing any movement of the carrier on the slide f<x>. Means are provided for stopping the loom if the weft fails during the shot of the shuttle to the replenishing side of the loom after the feeler has operated to effect weft-replenishment. The latch d<3x>, which has been raised by the action of the feeler and moved forwards by the weft hammer W, is held stationary by the action of the dwell in the cam actuating the hammer W<x> if the fork g detects weft-failure. When the latch drops, its tooth d<5>x drops behind a notch in the member 40, so that the latter is moved forwards to stop the loom when the hammer Wx completes its forward movement. When the loom is to operate as in case (4), the feeler is held inoperative as previously described.