US2033003A - Locking side slipping weft detector - Google Patents

Description

March 3, 1936. o. v. PAYNE LOCKING SIDE SLIPPING WEFT DETECTOR Filed June 10, 1955 I nvenkor Oscar V. Pay ne Patented Mar. 3, 1936 LOCKING SIDE SLIPPING WEFT DETECTOR Application June 10, 1935, Serial No. 25,747

10 Claims.

This invention relates to improvements in side slipping weft detectors for looms and it is the general object of the invention to provide means for locking the detector yieldingly in normal rearward position so that it will not be affected by 100111 vibration.

In my co-pending application Serial No. 727,302 I have shown a weft detector of the general type set forth hereinafter wherein I provide a feeler finger mounted on a carrier lever so operated that the latter moves away from an electric contact when the detector finger moves forwardly on non-indicating detecting beats. The relation of the parts is such that when the detector slips sideways along an exhausted supply of weft the carrier lever will be swung into engagement with the contact to close the latter and effect a change in loom operation.

In order to permit a detector of this type to be used with fine yarns the moving parts are made as light as possible and I have found that certain types of high speed looms set up a vibration in the detector finger because of its lightness tend ing to move the carrier lever into engagement with the contact. It is an important object of my present invention to provide an addition to the detector finger to cooperate with a part shown in the aforesaid application for holding the finger against vibration during the non-detecting period.

It is another object of my present invention to form the yielding lock in such a way that the detector finger is unlocked to be free to slip laterally by the first part of the forward stroke of the detector after the latter is engaged by the advancing surface to be detected. By such an arrangement it is unnecessary to provide additional parts to effect the unlocking, inasmuch as 15 form the detector finger so that it will cooperate with a lock or stop only when the detector is in its rearmost normal detecting position.

It is a further object of my present invention to provide the detector with a surface eccentric with respect to the axis of the lever and locate the locking notch at one end of the surface so that a stop pin may cooperate with said surface to move the latter relatively to the pin until the notch reaches said pin. In this way I have been able to. use a single spring which not only acts to return the detector finger and the lever to normal detecting position but also effective to hold the detector yieldingly locked against vibration.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

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

Fig. l is a plan view of a weft detector made according to my present invention showing the detector finger and carrier lever in two different positions,

Fig. 2 isa view similar to Fig. 1 but with the detector finger moved to indicating position,

Fig. 3 is a vertical section on line 33 of Fig. 1, and

Fig. 4 is a detailed plan of the detector finger detached.

Referring to the drawing, I have indicated a fixed detector support I 0 which in the present instance may be made with a floor H and an upstanding cylindrical wall l2. A hearing l3 projects upwardly from the floor and is provided with a bushing M which receives the depending stem I5 of a pivot stud IS. The latter is secured to a pair of lever plates I1 and I8 spaced vertically and forming a carrier lever designated generally at 19. Each plate has a foot 20 extending to the right of the pivot as shown in Fig. 2 for engagement with a spring contact 2| grounded to the support by holding screws 22 and insulated fromv a second contact 23 supported between insulators 24 held to a lug 25 formed as an integral part of the support. A contact wire 26 is attached to a 30 plate 21 in electrical connection with the spring contact 23 and when the two contacts are moved from. the open position shown in Fig. 1 to the closed position in Fig. 2 an external circuit not shown herein is closed to effect a change in loom operation.

The plates I1 and 18 have laterally extending. arms 30 supporting a pivot screw or stud 3! passing through the plates and also through a bearing 32 formed in the detector finger designated generally at 33. This finger may be formed of this fiat sheet material and has a cross bar 34 adapted for swinging movement about the stud 3| and between rearwardly extending arms 35 on the plates. A spacing brace pin 36 may connect the plates and serve also as a stop for the cross bar 34.

The detector finger has a rearwardly extending arm 31 carrying a weft engaging spring 38 forming the tip for the detector finger. The spring may be mounted as shown in Figs. 1 and 2 and lies partly in a closed slot 39 extending laterally and preferably arcuately in the rear of the detector finger. The spring has spaced coils and therefore can be turned into the slot 39 as though it were a hollow screw. I find that the spring is held by the solid structure at each end of the slot and has no tendency to become displaced or dislodged.

The cross bar has a small lug 40 to receive the rearward thrust of spring 4| the forward end of which is held by a similar lug 42 carried by lever I9. The cross bar has a rear curved surface 45 which is positioned for sliding engagement with a stop and positioning pin 46 carried by and projecting upwardly from the support. The surface 45 is eccentric with respect to the stud I 6 with the center slightly to the left of said stud, as will be seen from Figs. 1 and 2. While I have referred to the surface 45 as having a center yet this is not necessary so long as said surface approximates a curve having a center as mentioned. The essential feature of the curve is that expansion of the spring after a lateral movement of the detector will cause a camming action between the crossbar and the pin. 46 resulting in restoration of the detector and lever to their normal rear positions.

In the operation of the detector as thus far described the feeler. finger will normally be in the position shown in fulllines in Fig. 1 with the foot 20 so positioned. asto permit a spacing of the contacts 2| and 23. If the advancing bobbin B or other surface to be detected carries sufficient weft for continued weaving the tip will move forwardly without lateral motion to the. position indicated in dotted lines in Fig. 1, whereupon lever l9- will-. be swung to the dotted line position and the foot 20 will move away from contact 2!, thereby diminishing the likelihood of closing the contacts. When the advancing surface to be detected carries insufficient weft for continued weaving the. detector finger will slide along the bobbin to the position shown in Fig. 2, the effect of which is to rock lever L9 in a right hand direction around. stud l6 and cause. the foot 28 to move contact spring 2| into engagement with contact 23, thereby closing the contacts to effect change in loom operation as already said before.

The operation of the detector thus far. given may be the same as that set forth in my co-pending application Serial No. 727,302 and the particular formv of the. carrier lever employing top and bottomplates between which the detector finger slides to permit the detector to be inverted may be as setforth in my later co-pending application Serial No. 18,089.

The detector finger and carrier lever therefore may be made very light to permit use with fine yarn and as already stated this fact may under certain conditions cause vibration of the detector finger laterally or to the right as viewed in Fig. 1. My present invention aims to provide a simple means for preventing this vibration and in carrying my present invention into efiect I provide the cross bar 34 with a notch 50 located at the right end of the curved surface 45. near the juncture between the arm 31 and the cross bar 34. This notch may be formed in part by a shoulder at the left side thereof which is adapted for engagement with the stop pin 46. The shoulder 5! is so disposed as to coact with the stop pin 46 and enable. the latter to resist movement of the detector in a right hand direction by any force acting generally to the right from the pivot 35 and because of this fact, the carrier lever 59 is held in locked position with the foot incapable of moving the contact 2| toward the contact 23. The right hand part of the notch is defined by the adjacent edge of the arm 31 and the latter coacts with the shoulder 5| and the stop pin to prevent vibration of the carrier lever in a horizontal plane.

In operation the detector will normally be so positioned that the stop pin 46 will occupy the notch, being held there by the normal tendency of spring 4| to expand. As the loom runs with the lay in rear position any tendency to vibrate will be arrested as already described and as the lay advances to present the weft surface to the feeler tip the finger 33 will move forwardly upon initial engagement with the weft so that the shoulder will advance relatively to the fixed stop pin 46. If suflicient weft is present the finger will move forwardly without slipping and upon rearward motion of the lay the notch will approach and fit around the stop pin 46 by action of the spring 4|. When insufficient weft is present the detector slides laterally to indicate weft exhaustion, and the notch will move to the right away from the pin 46. Upon backward movement of the lay the spring will expand and cause the curved surface 45 to engage stop 46 to effect movement in a left hand direction on the part of the detector and carrier lever, thereby causing the notch to approach and finally be occupied by the. stop pin.

From the foregoing it will be seen that I have provided a very simple. form of lock for a side slipping weft detector effective to prevent lateral movement of the detector when the same is. in normal rearmost position. It will also be seen that the initial part of the forward motion of the detector finger serves to unlock the same so that it can. move laterally if required to give indication of weft exhaustion. It will further be seen that a single spring serves not only to return the detector finger and its carrier lever to normal position butalso reestablishes the locking relation. While I have shown one particular form of lock wherein av forward component of the detector finger motion is operative to effect unlocking, yet I do not wish necessarily to be limited to theexact form shown herein.

Having thus described my invention it will. be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1. In a side slipping weft detector for looms having a surface to be detected, a normally fixed support,- alever pivoted to the support, a detector finger pivoted to the lever and extending rearwardly to be positioned for engagement with the surface to be detected, said finger being moved forwardly when in engagement with a sufficient supply of weft and'slipping laterally along an insufficient supply of weft to effect rocking of the lever, means to effect a change of loom operation when the lever is moved by side slipping movement of the finger, and means defining ayieldable lock to hold the detector finger against vibration in a direction along the surface to be detected when said finger is in normal rear position, said detector finger moving the means to unlock the detector finger during the initial part of the forward movement of the detector due to engagement with the surface to be detected.

2. In a side slipping weft detector, a fixed support, a lever pivoted to the support capable of pivotal movement in two directions, means cooperating with the lever to be engaged by the latter to effect a change in loom operation when the lever moves in one direction, a detector finger pivoted to the lever and movable forwardly by a suflicient supply of weft to rock the lever in a direction away from said means, said detector finger slidable along an insufficient supply of weft to rock the lever into cooperative relation with the means, and a lock to engage the detector finger and operative when the lever is in rear position to prevent the detector finger from sliding along the weft surface, an initial forward movement of the detector finger being required to unlock detector finger from said lock and render the detector finger capable of moving along the weft surface.

3. In an electric side slipping weft detector, a fixed support, a lever pivoted to the support, an electric contact positioned for engagement with the lever, movement of the lever in one direction pivotally effecting engagement with the contact and movement of the lever in the opposite direction pivotally moving the lever away from the contact, a detector finger pivoted to the lever and capable of moving forwardly when engaging sufiicient weft to cause rocking of the lever away from the contact and capable when sliding along an insufficient supply of weft to rock the lever into engagement with the contact, and means including a part carried by the detector finger to prevent movement of the lever in either direction when the detector finger is in normal detecting position and requiring an initial forward movement of the detector before the latter is cap-able of sliding along an insufficient supply of weft to effect engagement between the lever and contact.

4. In an electric side slipping weft detector, a fixed support, a lever pivoted to the support, an electric contact positioned for engagement with the lever, pivotal movement of the lever in one direction effecting engagement with the contact and pivotal movement of the lever in the opposite direction moving said lever away from the contact, a detector finger pivoted to the lever and capable ofmoving forwardly when engaging sufficient weft to cause rocking of the lever away from the contact and capable when sliding along an insufiicient supply of weft to rock the lever into engagement with the contact, means defining a notch in the detector finger having shoulders on opposite sides of the notch, and a stop carried by the support to enter the notch, said stop effective to prevent movement of the detector finger in a direction to cause engagement between the lever and the contact when the detector finger is in normal detecting position, the shoulders being proportioned to require an initial forward movement of the detector finger before the latter is capable of slipping along an insufficient supply of weft.

5. In an electric side slipping weft detector, a

fixed support, a lever pivoted to the support, an

electric contact positioned for engagement with the lever, pivotal movement of the lever in one direction effecting engagement with the contact and pivotal movement of the lever in the opposite direction moving said lever away from the contact, a detector finger pivoted to the lever and capable of moving forwardly when engaging sufficient weft to cause rocking of the lever away from the contact and capable when sliding along an insufiicient supply of weft to rock the lever into engagement with the contact, stop means carried by the support, and a shoulder formed on the detector finger forming with a part of the latter a notch to receive the stop means, said stop means and shoulder effective to prevent movement of the detector finger along an insufiicient supply of weft until after said finger has had an initial movement forwardly from its normal rear position.

6. In an electric side slipping weft detector, a fixed support, a lever pivoted to the support, an electric contact positioned for engagement with the lever, pivotal movement of the lever in one direction efiecting engagement with the contact and pivotal movement of the lever in the opposite direction moving said lever away from the contact, a detector finger pivoted to the lever and capable of moving forwardly when engaging sufficient weft to cause rocking of the lever away from the contact and capable when sliding along an insufiicient supply of weft to rock the lever into engagement with the contact, a stop element, and a shoulder element, one of said elements carried by the detector finger and the other element carried by the support, said elements normally related to prevent movement of the detector finger along an insufficient supply of weft when the detector is in normal rear detecting position, said elements being so proportioned as to require an initial forward movement of the detector finger from normal rear position before said detector finger is capable of sliding along an insufiicient supply of Weft.

'7. In an electric side slipping weft detector, a fixed support, a lever pivoted to the support, an electric contact positioned for engagement with the lever, pivotal movement of the lever in one direction effecting engagement with the contact and pivotal movement of the lever in the opposite direction pivotally moving said lever away from the contact, a detector finger pivoted to the lever and capable of moving forwardly when engaging sufiicient weft to cause rocking of the lever away from the contact and capable when sliding along an insufiicient supply of weft to rock the lever into engagement with the contact, and cooperating lock elements carried partly by the support and partly by the detector finger and effective when the detector finger is in normal rear position to prevent movement of the lever by a force tending to move said lever into engagement with the contact, the elements being moved to non-cooperative position by an initial forward movement of the detector finger to render the latter capable of movement along an insufficient supply of weft to effect engagement between the lever and the contact.

8. In an electric side slipping weft detector, a fixed support, a lever pivoted to said support, an electric contact carried by the support for engagement with the lever, a detector finger having a cam surface and a rearwardly extending arm, the detector finger when moving forwardly in engagement with a sufficient supply of weft causing the lever to move pivotally away from the contact and said detector finger when sliding along an insufiicient supply of weft causing the lever to move pivotally in the opposite direction into engagement with the contact, a spring interposed between the lever and detector finger, a stop carried by the support along which the cam face of the detector is adapted to slide under action of said spring, and means carried by the detector finger defining a notch to receive the stop, said notch being located at one end of the cam face and adjacent the aforesaid arm and capable of preventing movement of the lever toward the contact until after the detector finger has had an initial movement forwardly from its normal rear position.

9. In a weft detector for looms, a carrier lever movable in a given direction to effect indication of weft exhaustion, a pivot for the lever, a detector finger pivoted to the lever and having an operating surface eccentric relatively to the pivot of the lever, a stop to cooperate with the surface, said stop and finger so formed as to cooperate to hold said finger locked against improper indicating movement when said finger is in normal detecting position, and a single spring operatively related to the lever and finger to cause cooperation between the stop and surface and being thereby effective (1) to move the lever in a direction opposite said given direction, (2) restore the finger to normal detecting position after a detecting movement, and (3) establish yielding cooperation between the stop and finger to hold the latter yieldingly locked when said finger is in normal detecting position.

10. In a weft detector for a loom having a weft element to be detected, a stand, a detector carrier,

a pivotal connection between the carrier and stand, a weft detector pivotally, connected to and supported by the carrier and having a lateral movement to rock the carrier about its pivotal connection on indicating beats of the loom, a resilient connection between the carrier and detector, a stop to coact with the detector to lock thelatter when in normal non-detecting position, said detector having a surface eccentric with respect to said pivotal connection, the stop and detector being disengaged by forward motion of the detector due to motion of the Weft element to unlock the latter, and the resilient connection eifective to move said surface against the stop, said surface and stop coacting together with the resilient connection to move the detector back to normal position and also reestablish locking relation between the stop and detector after an indicating movement of the detector.

OSCAR V. PAYNE.

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