US2543488A - Device for preventing false weft detection - Google Patents

Description

Feb. 27, 1951 L. A. CARRON DEVICE FOR PREVENTING FALSE WEFT DETECTION Filed Sept. 8, 1949 INVENTOR LEON. A. CARRON m 7? Y M ATTORNEY Patented Feb. 27, 1951 OFFHQE DEVIE F018, PREVENTING FALSE WEFT DETECTION Leon A. Carron, Worcester, Mass, assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application September 8, 1949, Serial No. 114,557

6 Claims. 1

This invention relates to improvements in electrically indicating side slipping weft detectors for weft replenishing looms and it is the general object of the invention to prevent the detector from giving a false indication when it is moved forwardlv incident to a weft replenshing operation of the loom.

Multicolor weft replenishing looms are generall" made with the weft detector at the magazine end. This construction requires that the detector be moved out of the path of the incoming bobbin at the time of weft replenishment. When a weft detector of the side slipping type is employed there is likelihood that the forward motion of the detector made necessary to clear the path for the incoming bobbin may produce a false indication of weft exhaustion.

It is an important object of the present invention to provide a lock lever on the weft detector mechanism normally in non-locking position to permit the detector to perform its detecting function on non-replenishing beats of the loom but so controlled as to move into locking relation with respect to the detector when the latter is moved forwardly by the transferrer arm and thereby prevent a false indication.

With these and other objects in view which will appear as the description proceeds, the in-- vention resides in the combination and arrange ment of parts hereinafter described and set forth.

In the accompanying drawings, wherein a convenient embodiment of the invention is set forth,

Fig. l is a side elevation of part of a weft repl nishing loom, the lay and shuttle being in cross section and the weft detector being in normal position,

Fig. 2 is an enlarged plan view looking in the direction of arrow 2, Fig. 1, the bolt which holds the detector to its carrier being in section,

V Fig. 3 is a view similar to Fig. z but showing the detector in its forward p'ositionwith the locking lever moved to locking position, and

Fig. 4 is an enlarged detailed vertical section on line i i, Fig. 3.

Referring to Fig. 1, the loom frame iii supports the foot H of a weft replenishing mechanism which includes in its construction a transferrer arm 52. The latteris pivotally mounted on a stud l3 secured to stand H and has a depending foot i i provided with a laterally extending lug I5.

Secured to the stud E3 in stationary position is a stand i5 which holds a support 5 l in stationary adjusted position. The support has a hub E3 in which is-slidably mounted a rod 59 the forward guide rod 22 secured to the support ll.

and at its other end to the plate it.

2 end of which, at the left as viewed in Fig. 1, is secured to a U-shaped carrier 2d. The latter has an upstanding arm 2i through which passes a The carrier has a forward upright arm 23 to which is attached the forward end of a tension spring 24 the rear end of which is attached as at 25 to a part of the support ii. The effect of spring 24 is to hold a carrier 21! in rearward position, or to the right as viewed in Fig. l, but permit the carrier to slide forwardly on a replenishing beat of the loom. On such a beat the transferrer arm l2 will rock in a clockwise direction around stud l3 and the lug 15 will engage the arm 23 and move the carrier forwardly.

The weft detector mechanism, designated generally at D, comprises a plate 39 which may be made of sheet steel and supports at its rear end a stud 3! on which is pivotally mounted a detector finger 32. The latter finger has slidably mounted therein a detector wire 33 having a detector tip 3 for engagement with the bobbin in the shuttle. The tip 34 is normally held in rear position but upon engagement with a full supply of weft will slide forwardly in the finger 32 without causing angular motion of the latter. When, however, the detector engages a depleted bobbin it will slide to the right and move to the dotted line position shown in Fig. 2 against the action of a spring 35 which surrounds stud 3i and is operatively connected at one end to the finger 32 Plate 30 is provided with a back and forth extending slot 35 through which extends a bolt 3? which secures the plate to the underside of carrier 28. By loosening bolt 37 the weft detector can be adjusted rearwardly or forwardly relatively to carrier 2i and the support ll.

' Extending forwardly from the detector finger 32 is a switch controlling finger 59 for cooperation with a plunger 4! forming part of an electric switch 32 secured to the under side of plate 30. The switch is so constructed that when the plunger is pushed in, or moved to the right as viewed in Fig. 2, the switch will be open, but when the detector moves to indicating position, shown in dotted lines Fig. 2, the finger 353 will move to the left, thereby permitting plunger ii to move to the left to effect closure of a contact within the switch 42. When this switch is closed a loom controlling circuit including electric wires 43 and 4 3 is closed to effect a change in loom operation, such as weft replenishment.

The matter thus far described may be of common construction and operates in the usual manner. When the shuttle S in the shuttle box 45 is to be replenished the transferrer arm 2! descends to push a new bobbin into the shuttle, the old bobbin passing downwardly through a slot G in the lay 5?. At the same time the carrier 29, detector plate 30, and detector finger are moved forwardly by lug l5, and it is incident to this forward motion that the detector finger is likely to rock on its pivot stud SI and move finger so to the left, Fig. 2, and permit plunger ll to enable switch 42 to givea false indication of weft exhaustion.

The object of the present invention is to provide means which would prevent the detector finger from having a false indication when it is moved forwardly due to descent of the transferrer arm, and in carrying the invention into effect .1 provide a lock lever 59 pivoted at its right end as viewed in Fig. 2 to a stud or screw 5| fastened to and extending upwardly from the plate 30. A wing 52 is secured to the lever 55! and extends upwardly therefrom for engagement with a positioning screw 53 adjustable back and forth in the stationary support H. A spring 55, shown in Fig. 2 as of the resilient wire type, has an end 65 thereof received by a groove '56 in the forward edge of the lever 59 to be held in operative relation with respect to the lever. The spring eX- tends down through a perforation 51 in the plate and is then bent in the form of an eye 58 and held by the head '59 of a screw 68 tapped into the under side plate 39. The effect of the spring is to urge lever 56in a clockwise direction as viewed in Fig. 2. Spring 55 is weaker than spring 24 so that the latter is always ableto overpower the weaker spring and maintain the detector in normal detecting position on non-re plenishing beats of the loom.

Lever 59 is provided with a detector or notch ii to receive a lug 62 on the forward part of finger or arm 42 when the lever is in looking position. The left side of notch 6|, Fi 2. is defined by a shoulder 63 on lever 55!, and a stop wall 64 on the lever is at the front of the notch.

Under normal conditions the parts will be in the position shown in Fig. 2. lever 58 being held in forward non-locking posit-ion due to the fact that spring 2 while acting to maintain the detector in rear position causes the wing 52 to engage the stationary control member or screw 53 and thus hold the lever 50 in open or non-locking position. as shown in Fig. 2. On a weft replenisln ing beat of the loom, however, when plate 30 moves forwardly as already described the lever 50 also moves forwardly, but the screw 53 remains stationary and as the pivot or stud 5i advances the screw 53 becomes a fulcrum around which the lever can rock until lug 52 enters the notch 6| as shown in Fig. 3. The shoulder 63is then at the left of lug Eland the detectorfinger cannot rock in a direction to give a false indication of weft exhaustion and the switch 42 remains open. During continued forward motion of plate St! the lock lever moves away from screw 53 and wall 64 by its engagement with the front of lug 62 prevents further turning of the lever on plate 30.

As the lay moves rearwardly subsequent to a replenishing operation the spring 24 returnsthe detector to its normal position, and in doing so causes screw 53. to effect rocking of lever 50 relatively to plate 30 in a counter-clockwise direction around the pivot stud 5| and return the lever to its normal non-locking position shown in Fig. 2.

From the foregoing it will be seen that the invention sets forth simple means for preventing an electrical side slipping weft detector from giving a false indication by providing a lock lever normally in non-locking position when the detector is in rear position but moved to locking position relatively to the detector finger when the'detector mechanism is moved forwardly by the transferrer arm. Lever 53 moves into locking position incident to forward motion of plate 30 and no additional mechanism is needed to effect movement of the lever to locking position. Screw .53 can be adjusted to regulate the time of looking of the detector finger should the plate 30 be adjusted'back or forth relatively to carrier 20 by means of bolt 36.

Having thus described the invention it will be seen that changes and modifications of the foregoing specific disclosure may be made without departing'from the spirit and scope of the invention.

What is claimed as new is:

1. In weft detecting mechanism for a loom having a transferrer arm which operates on weft repleni hing beats of the loom, a weft detector moved forwardly by the transferrer arm on replenishing beats of the loom, a side slipping detector finger on the weft detector normally in nonindioating position but tending to have a false side slipping indicating movement when the weft detector is moved forwardly by the transferrer arm, a lock lever for said finger pivoted on the weft detector, a stationary control member normally engaging said lever and preventing "the latter from moving to locking position relatively to sa d finger when the weft detector is in normal position, and resilient means tending to move the lock lever into locking position relative to said finger, said weft detector when moved by the transferrer arm moving the lever relatively to said control member and said resilient means thereupon moving 'the lever into locking relation with the finger to prevent the latter from having a false side slipping movement.

2. In an electrically indicating side slipping weft detector mechanism for a loom having a transferrer arm which operates on weft replenishing beats of the loom, a weft detector normally in detecting position but moved from such position by the transferrer arm on a weft replenishing beat of the loom, a detector finger pivoted on said weft detector normally in nonindicating position but tending to move the indicating position when the weft detector is .moved by the transferrer arm, an electric switch on said weft detector, an arm on said detectorfinger normally maintaining the switch open, a lock lever pivoted on said weft detector moving with the latter and formed to have holding engagement with the arm, a stationary control member engaging the lock lever and normally maintaining the latterinnonlocking posi- -.'tion with respect to said arm, and means moving the lever into locking relation with said arm when the weft detector is moved by the transferrer arm and moves the lock lever relatively to said stationary control member.

3. In weft detecting mechanism for a loom having a transferrer arm which operates on weft replenishing beats of the loom, a stationary support, a carrier. movable backwardly and forwardly 5 and finger and. the latter tending due to said movement to have a false side slipping motion, a lock lever mounted for pivotal motion relative to the carrier and moving baekwardly and forwardly therewith, a stationary control member normally engaging the lock lever and holding the latter in nonlocking position with respect to said finger, and a spring normally urging the lever toward locking position and against said control member and exerting less' force than the 1 first named spring, said carrier when moved forwardly by the transferrer arm overpowering the first named spring and enabling the second spring to move the lock lever into locking relation with respect to said finger to prevent the latter from having a false side slipping motion.

4. In weft detecting mechanism for a weft replenishing loom, a stationary support, a carrier movable backwardly and forwardly relatively to the support, a plate secured to said carrier, a side slipping weft detector finger pivoted on the plate, a lock lever pivoted on the plate normally tending to move into locking position with respect to said finger, the carrier and plate and finger having a forward movement on weft replenishing beats of the loom and said finger tending to have a false side slipping motion due to said movement, a stationary control member for said lock lever adjustable backwardly and forwardly with respect to said support and normally preventing said lever-from moving into locking relation with said finger, and holding connections between the carrier and plate by which said carrier and plate are adjustable with respect to eachfother in a back and forth direction, said plate when having said forward movement moving said lever relatively to said control member and enabling said pivoted thereon and having a lock lever pivoted thereon and supporting a spring normally tending to move the lock lever into locking relation with respect to said detector finger, said lever constructed to engage said control member and said plate constructed for attachment to said carrier.

6. In weft detecting mechanism for a weft replenishing loom, a stationary control member, a weft detector having a forward movement on weft replenishing beats of the loom, a side slipping detector finger, a pivotal connection between the finger and the weft detector, an arm on said finger extending forwardly from said pivotal connection, a lock lever pivoted on the weft detector having a stop wall and a shoulder, and resilient means normally tending to move the lock lever into locking relation with respect to said arm but prevented from doing so by said control member, said weft detector when moving forwardly moving said lock lever and detector finger forwardly relatively to said control member and said resilient means thereupon moving said stop wall rearwardly against said arm and moving said shoulder into position to prevent side slipping motion of the finger relatively to the weft detector.

LEON A. CARRON.

No references cited.

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