US1661337A - Detector mechanism for looms - Google Patents

Description

DETECTOR MECHANISM FOR LOOMS Filed Dec. 5. 1924 Ii qi.

witness: mwfirifivy- Patented Mar. 6, 1928.

JONAS nonrrnnor; or 1102111211112, MASSACHUSETTS,- nssrenon, BY mnsnn ASSIGN- MENTS, TO DBAPER CORPORATION, OF HOPEDALE, MASSACHUSETTS, A GORPORA- TION 0F MAINE.

DETECTOR MECHANISM FOR LOOKS.

Application filed December 5, 1924. Serial No. 754,064.

The present invention relates to an improvement in detector mechanisms looms. The object of the invention is to reorganize and improve the construction of the mechanisms by which weft detectors operate to stop the-looms or cause weft replenishment in looms, and to this end the invention consists of the mechanisms hereinafter described and particularly defined in the claims.

In the accompanying drawing illustrating the preferred form of the invention Fig. 1 is a plan-of a detector slide, and Fig. 2 is an elevation partially in section.

The illustrated embodiment of the invention is described as follows: The weft detector or fork is pivotally mounted at 11 on the detector slide 12 slidingly supported 7 on the detector slide bracket 13, which cooperates with a knock-off lever to knock off the loom and also with aweft replenishing mechanism to cause weft replenishment, as illustrated in the Jonas Northrop Patent No. 1,186,988. The slide is provided with a.

misthreading device indicated in a general way by the reference character 14 illustrated in said patent. A. weft hammer 15 carries at its upper end a weft hammer hook 16 pivoted to the weft hammer on the pin 17 and normally held in depressed position by the spring 18 placed on one side of the pin 17, as shownin Fig. 2. The weft hammer hook 16 is provided with a barb 19 adapted toengage the tail 20 of the fork 10. \Vhen the lay beats forward, the weft, lying across thegrid, strikes the tines of the fork 10 and tips the fork so as to lift the tailof the fork above the barb; then upon the forward movement of the weft hammer the barb passes under the tail of the fork, and the hammer moves forwardly without imparting movement to the detector slide.

On the forward movementof the weft hammer the fiat under surface 21 of theweft hammer hook slides upon the plate 22 of the detector slide 12 so that the hook has a movement forward and backward with respect to the detector slide, except in the ab sence of yarn in front of the grid, in which case the fork is not tilted, and the barbof the hook engages the tail of the fork and pulls upon it to move the detector slide forwardly. Upon the first forward movement for.

of the slide weft replenishment iscalled for in the usual manner. After a'number of weftreplenishing attempts, the 100m is knocked off and comes to rest. The weft hammer hook is provided with an overhanging guard or finger 23 which extends upwardly from the body of the hook and thence rearwardly over the fork. When thread is present in front of the grid on the lay and the fork is thereby tipped lifting the tail 20 of the fork, it is held tipped until the weft hammer has moved forwardly sufliciently to move the barb of the hook be yond the cross member of the tail, whereupon the tail engages the tail-supporting surface 24 of the hook which extends from the barb to the knuckle 25 of the'finger 23; then during the further forwardmovement of the hook the tail of the fork slides on this tail-supporting surface. The under side of the finger '23 is so shaped that it engages a portion of the fork and prevents it fromoverthrowing. Thus when the fork strikes the yarn it is tilted with more or less violence, and that tips the tail up until the body of the tail strikesthe under side of the finger. This prevents overthrow of the fork, and the fork is thereafter prevented from dropping backto its original position by reason of the tail-supporting surface of the finger which engages the tail. lVhen the weft hammer moves rearwardly, the tail slides down the inclined surface of the hook and drops over the barb at the extreme end of the rearward movement of the weft hammer. The tail falls but a short distance, and rebound of the tail does not occur.

The detector fork 10 comprises a body portionconsisting of the main part 26 having a hole through which the pivot 11 passes, and the cover 27 which consists of a flat piece of metal having a hook 28 at its forward end which engages the forward end of the part 26 of the body. Two screws 29 se cure the cover part to the part 26. The tines 30 of the fork are four in number and are formed in pairs. The two tines of one pair are joined by the arcuate top 31 which, as shown in dotted lines in Fig. 2, is received in a depression in the upper part 26 of the body. This affords a secure means for holding the tines in place in, the body, as well as a construct-ion by which renewal of the tines may be effected. The ends of the tail Q0 of the fork extend along recesses formed in the upper surface .of the body part- 26 and have their ends at right angles to the length of their bodies and are received in vertical holes in the body part 26. A. pull exerted upon the tail of the fork is thereby transmitted to the body part 26 and through itto the slide. in a manner which prevents any change in the position of the barb-engaging portion of the tail with respect to the slide. The cover part 27 of the fork body is provided with slight depressions to receive the arcuate parts of the tines and with longitudinal grooves to receive the tail slides. The body part of the fork is provided with two depending cars 32 which are provided to counterbalance the weight of the tines. The body. parts 26 and 21' of the fork are made of aluminum. the tines and tail of steel wire. and the screws 2.) of steel.

It will be o served that by providing the weft hammer hook with the overhanging tingcr excessive movements of the fork are prevented and that the inclined surface adjacent to the barb contributes to the proper action of the fork under the influence. of the blows to which it is subjected.

Having thus described the invention, what is claimed is:

1. Detector mechanism for looms having, in combination, a detector slide. a detector fork carried by the slide provided with a tail. and a weft hammer provided with a weft hammer hook and a fork guard extending rearwardly from the weft hammer hook above the weft fork for engaging the fork upon excessive upward movementthereof.

2. Detector mechanism for looms having, in coml'iination. a detector slide. a detector fork carried by the slide provided with a tail. and a weft hammer provided with a weft hammer hook and an overhanging fork guard for engaging the fork upon excessive upward movement thereof, the hook having a barb for engagement with the tail and provided with an inclined tail-supporting surface adjacent to the bar for engaging and supporting the tail of the fork and easing its descent to a position in front of the barb upon rearward movement of the hook.

3. Detector mechanism for looms havii'ig. in coml'iination. a detector slide provided with a weft hammer hook support. a detector fork pivotally mounted on the slide provided with a tail. and a. weft hammer provided with a weft hammer hook. the under side of which is adapted to rest and slide upon the hook support of the detector slide. the hook being provided with a barb for engagement with the tail of the fork and having an overhanging guard extending upwardly and rearwardly from the body of the hook in the rear of the barb over the body of the tail and adapted upon oscillation of the tail to engage and limit the throw of the tail upon its impact with the yarn, said finger having an inclincd tailsnpporting surface exte11 .ling from the barb upwardly and rearwardly and forming the. upper surface of the proximal end of the guard.

at. Detector mechanism for looms having. in combination. a detector slidc. detector fork carried by the slide provided with tines and a tail. and a weft hammer provided with a. weft hammer hook having an overhanging fork guard extending rcarwardly over the body of the fork and adapted to engage the latter upon overthrow of the fork. said hook being also provided with a barb for engagement with the tail upon failure of weft indication.

5. Detector mechanism for looms having. in combination. a detector slide, a detector fork carried by the slide provided with a tail. :1 weft hammer provided with a weft hannner hook for engaging the tail of the fork, and a spring connection between the weft hammer and the weft hammer hook acting to hold the hook in depressed position.

6. Detector mechanism for looms having. in combination. a detector slide provided .with a hook supporting plate. a detector fork carried by the slide provided with a tail. a weft hammer. weft hammer hook. PlYOftllly mounted on the weft hammer and resting on the hook supporting plate of the slidc. and a sprin; connection between the weft hammer and the weft. hammer hook acting to hold the hook against the support.- ing plate so as normally to maintain it in correct operative position with relation to the fork tail.

7. Detector mechanisn'i for looms having. in combination. a detector slide provided with a weft hammer hook support. a detector fork carried by the slide provided with a tail. :1. weft hannner. a weft hammer hook pivotally mounted on the weft hammer and having a portion rcr' tiug on and supported by the hook snpport.tl1c weft hammer hook being provided with a spring carvying portion above the pivot. and a spring in said spring carrying portion of the hook taking against a portion of the weft hammer. tending to turn the hook in a direction to hold it down on the hook support.

In testimony whereof l have signed name to this specification.

JONAS XORTIIROI.

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