US2735628A - weatherford - Google Patents

Description

Feb. 21, 1956 WEATHERFORD BOBBIN WINDER Filed Dec. 15, 1952 INVENTOR H. WEATHERFORD ATTORNEY United States Patent O BOBBIN WINDER Harry H. Weatherford, Smithville, Tenn.

Application December 15, 1952, Serial No. 325,969

4 Claims. (Cl. 242-22) This application relates to the manufacture of textiles and to the machinery by which such textiles are produced. The invention is directed particularly to power operated machines capable of producing lock stitches and which machines also employ bobbins.

The invention is directed specifically to bobbin winders, which are powered either from the belt which drives the machine or from the fly wheel of the machine and which winders include mechanism for automatically releasing the bobbins as soon as they become filled.

Bobbin winders of this same general character are old in the art. However, they have had certain weaknesses including the spring which maintains the guide in a position at least to contact the thread as it is wound upon the bobbin. Prior devices have not had a stop for limiting the movement of the guide for the thread and consequently excessive movement caused excessive stress upon the spring and frequently resulted in breakage of the same.

It is an object of the invention to overcome the difficulties enumerated and to provide a bobbin Winder of improved construction by means of which a bobbin may be wound until it is full and the winding then automatically terminated and without frequent breakdowns interfering with the expeditious winding of the bobbin.

Another object of the invention is to provide a structure which is relatively simple, consists of few parts which can be readily produced, assembled and will satisfactorily and efficiently perform the function for which created.

Other objects and advantages of the present invention will be apparent from the following description taken in conjunction with the attached drawings wherein:

Fig. l is a fragmentary perspective illustrating one application of the invention;

Fig. 2, a vertical section through the bearing and releasing mechanism;

Fig. 3, a similar view with the parts in a different position; and

Fig. 4, a fragmentary end elevational view with the parts in a still further position.

Briefly stated the bobbin winder comprises a frame adapted to be attached to the bed of a sewing machine, such frame including a pivotally mounted yoke in which is journalled a shaft having a pulley on one end which comes in contact with and is driven by the belt of the machine when the yoke is in the proper position. On the opposite end of the shaft is adapted to be received the bobbin which is to be filled. The end of the shaft is split so that the bobbin will be frictionally held in engagement with the shaft when it is applied thereupon. A yoke is spring biased in order normally to maintain the pulley out of contact with the belt of the machine by means of which the pulley is driven.

A combination guide and operating member is pivotally mounted so that it may swing into the space between the ends of the bobbin and subsequently be engaged by the thread as it is wound upon the bobbin and the latter becomes filled. The guide is biased toward the shaft on 2,735,628 Patented Feb. 21, 1956 which the bobbin is carried by means of a helical spring along the center of which is disposed a pin. The pin limits the pivotal movement of the guide and the spring urges the guide toward the shaft on which it is mounted. On the body of the guide is disposed a curved detent which engages a boss on the yoke; by this mechanism the pulley is held in engagement with the driving belt until such time as the thread on the bobbin moves the guide away from the shaft on which the yoke is mounted until the bobbin is filled whereupon the detent on the guide will be withdrawn from beneath the boss on the yoke and the latter with the pulley will be swung by the action of the spring by which it is biased to a position out of engagement with the driving belt.

With continued reference to the drawings a conventional lock stitch type sewing machine has a bed plate 10, to which the bobbin winder of the present invention is adapted to be attached. The sewing machine includes an upstanding arm 11 and a power belt 12 by means of which the machine is operated. v

The bobbin winder comprises a base 13 which may be attached to the bed 10 of the conventional lock stitch machine by means of screws or other fasteners 14. On the base 13 are a pair of uprights 15 and 16 to the upper end of the latter of which is connected by a stud 17 the pivotal bearing portion 18 of a yoke 19 having bearing arms 20 and 21in which is journalled a shaft 22. On one end of the shaft is fixed a pulley 23 which is adapted to be moved into contact with and to be driven by the power belt 12 which drives the machine. On the opposite end of the shaft 22 is mounted a spacing collar 24 against which a bobbin 25 is adapted to abut, a pin 26 being employed to enter a notch in the bobbin to insure the rotation of the bobbin on the shaft. The shaft is provided with a slot 27 so that the bobbin may be frictionally held thereupon.

A spring 28 is mounted about the stud 17 and is under tension so that the yoke 19 will be biased in one position and in which position the pulley 23 will be out of engagement with the belt 12 so that the bobbin on the end of the shaft opposite that on which the pulley is carried will not continue to have thread wound thereon.

On the upper end of the arm 15 is mounted a pivot pin 29 about which is disposed a bearing 30 on which is supported a combination guide and operating member 31 for maintaining the bobbin in proper position and serving also asa portion of the mechanism on releasing the bobbin or discontinuing or winding of the sameafter it has become filled. g

In order to maintain the guide in engagement with the bobbin so that thread will be wound thereon, a helical spring 32 is confined between the base 13 and the body of the guide member 31. Along the center of this spring is disposed a pin 33 having a head 34 disposed in a recess 35 on the underside of the base 13, the point or tip end portion of the pin extending through the aperture 36 in the body of the guide member 31. This limits the amount of rotation of the guide member.

The guide member 31 has a curved detent 37 which is adapted to engage a boss 38 on an extension of the arm 20 of the yoke 19. After the bobbin winder is filled the thread will engage the guide 31 and move the detent 37 beneath the boss 38. to allow the spring 28 to move the pulley 23 forwardly of the machine out of contact with the driving belt 12 to stop the winding of the pulley.

In order to stop rotation of the pulley 23 and the bobbin 25 a friction member 39 is mounted by fasteners 40 to a raised portion 41 of the base 13. -Thus in one position the pulley 23 will be in contact with the friction member 39 and will not be rotated but when moved by the oscillation of the yoke this pulley will be brought into another position in contact with the driving belt 12 and over the split end of said shaft. The guide is then released so that it will 'move toward the shaft whereupon. the shaft with the belt engaging pulley 23 and the bobbin will be oscillated to bring the pulley into contact with the belt 12; The curved detent 37 is then brought beneath the end of the boss 38 where it will remain until sufiicient thread has been wound upon the bobbin to engage and move the guide 31' away from the shaft 22 thereby releasing the detent 37 from the boss 38 and allowing the shaft to swing the pulley 23 out of contact with the belt 12 and into contact with the friction or brake member 39 stopping the rotation of the pulley and.

vented from rotating or swinging except through a limited arc. vented.

Thus excessive tension on the spring is pre- In other words by the present invention the spring is prevented from being subjected to undue stress by the pin 33' engaging the pivotal portion of the finger 31 as shown in Fig. 4 which serves as a stop limiting the downward movement of the finger of the operator. The structure of this character instead of the old independent spring attached by'a bolt or a screw results in a definite improvement in the life and operation of the device.

It will beobvious to those skilled in the art that various changes may be made in the invention without departing from the spirit and scope thereof and'therefore the invention is not limited bythat which is shown in the drawings and described in the specification but only as indicated in the appended claims.

What is claimed is:

1. In a bobbin winder having a rotatably mounted shaft adapted to receive a bobbin thereon, a guide mounted on a, hub and having a portion adapted to be located between the ends of the bobbin and to be con tacted by thread on the bobbin, said guide having an aperture, a pin fixed to said frame and extending into said aperture, said pin being mounted to engage said. hub upon the bobbin becoming filled, a spring associated with said pin for biasing said guide toward said shaft, a detent on said guide, and a projection associated with said shaft adapted to be engaged by said detent when the parts are in one position, and said guide being adapted to be moved when sufficient thread is wound to withdraw said detent'from beneath said projection.

2. In a bobbin winder a shaft adapted to support a bobbin to" be' wound, afirst support" rotatably mounting said shaft, a second support pivotally mounting the first, a fixed pivot located beside said shaft, a member mounted on said fixed pivot and having a portion located in a position to be contacted by a predetermined accumulation of thread on said bobbin, spring means biasing said member towards said shaft, an elongated body limiting the swinging movement of said member toward said shaft, means biasing said shaft toward such fixed pivot and said member toward said shaft, and means for limiting the swinging movement of said member away from said shaft.

3. In a bobbin winder shaft adapted to support a bobbin to be wound, a first support rotatably mounting said shaft, a second support pivotally mounting the first, a fixed pivot located beside said shaft, a member mounted on said fixed pivot and having a portion located in a position to be contacted by a predetermined accumulation of thread on said bobbin, spring means biasing said member toward said shaft, and a pin limiting the swinging movement of said member toward said shaft, means biasing said shaft toward such fixed pivot and said member toward said shaft, and means for limiting the swinging movement of said' member away from said shaft comprising a movable pin engageable by said member and when so engaged movable into contact with said fixed pivot.

4. In a bobbin winder a shaft adapted to support a bobbin tobe wound, a first support rotatably mounting said shaft, a second support pivotally mounting the first, a fixed pivot located beside said shaft, a member mounted on said fixed pivotand having a portion located in a posi- References Cited in the file of this patent UNITED STATES PATENTS 188,943 Powers Mar. 27, 1877 335,019 Connolly Jan. 26, 1886 1,176,434 Corning Mar. 21, 1916 1,308,529 Peterson July 1, 1919 1,387,141 Flanagan Aug. 9, 1921 2,430,932 Hohmann Nov. 18, 1947

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