US1085801A - Looper mechanism for sewing-machines. - Google Patents

Description

A. H. DE VOE. LOOPER MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JAN. 30, 1911.

1,085,801, Patented Feb. 3, 1914.

UNITED STATES PATENT QFFICE.

ALBERT H. DE VOE, OF WESTFIELD, NEW JERSEY, ASSIGNOR '10v THE SING-ER MANUFACTURING COMPANY, A, CORPORATION OF NEW JERSEY.

LOOPER MECHANISM FOR SEWING-1VIACHINES.

Specification of Letters Patent.

Application filed January 30, 1911.

Patented Feb. 3, 1914.

Serial No. 605,391.

To all whom it may concern:

Be it known that I, ALBERT H. DE Von, a citizen of the United States, residing at \Vestfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Looper Mechanism for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has for its object to provide a simple and effective means for imparting to the looper of a sewing machine endwise loop-seizing movements and sidewise needle-avoiding movements.

In its preferred form, the improvement comprises a rotary shaft carrying an actuating eccentric embraced by a loose collar con-, fined thereon against endwise movement and provided upon one side with a tubular hearing or guide-socket arranged at an angle with the axis of the shaft and entered by a similarly inclined pin secured to a rocking and sliding looper-carrier formed with a hub or sleeve loosely fitted upon a supporting pin parallel with the said shaft.

In the accompanying drawings, Figure 1 is a side elevation, partly in section, of the forward portion of a sewing machine provided with the present improvement, and Fig. 2 a front end elevation of the same with the face-plate removed and the base and work-plate in transverse section. Fig. 3 is a detached plan view of the looper mechanism and feeding mechanism. Fig. 4 is a perspective view of the collar provided with the inclined guide-socket. Fig. 5 is a perspective elevational view and Fig. 6 a plan of the looper.

The present improvement is embodied in the well known Singer No. 62 double-chainstitch machine, and is constructed with a frame comprising the bed 1 from the rearward end of which rises the hollow standard 2 with overhanging tubular arm 3 formed with the hollow head 4 in which is journaled the reciprocating needle-bar 5 carrying the needle 6 and provided with the fixed collar 7 connected by the link 8 with the crank-arm 9'upon the rock-shaft 1O journaled in the overhanging arm 3 and deriving its operative movements from the usual connection with the main-shaft 11 disposed longitudinally of the base beneath the work-plate 12 and journaled in suitable bearing members 13 and 14 rising from the base.

Upon the'reduced. forward portion 11* of the driving shaft is mounted the looperactuatmg eccentric 15 formed at one end with the flange 16 to which is applied the set-screw 17 by means of which the eccentric is fixed upon the shaft. Fitted upon the eccentric 15 is the loose collar 18 provided upon one side with the transverse tubular boss 19 having its aperture 20 arranged at an inclination to the axis of the main-shaft. The bore of the boss 19 affords a guideway for the similarly inclined pin 21 having one end portion secured by means of the set-screw 22 in a socket formed in the boss 23 upon a lateral arm 24 of a sleeve 25 slidingly fitted upon a supporting. pin 26 mounted in the bearing members 13 and 14 beneath and parallel with, the main-shaft. The arm 24 is provided upon the side opposite the boss 23 with a seat to which is secured by means of screws 27 the foot of the looper-carrying arm 28 provided with the usual socket in which is secured by means of the set-screw 29 the shank 30 of the looper 31 formed with the laterally curved blade 32 having the usual thread-eye 33 in its point. At the heel of the blade the looper is provided with the lateral ear 34 provided with the threadeye 35 through which the looper-thread is passed to the eyed forward end of the looperblade.

The collar 18 is confined against endwise movement upon its supporting eccentric between the eccentric-fiange 16 and the flange 36 of the feed-lifting eccentric 37 mounted upon the reduced portion 11 of the mainshaft upon which it is secured by a set-screw 38. The eccentric 37 is embraced by the collar 39 having the transverse socket 40 in which is securedthe slide-pin 41 fitted witlr in a guide-aperture in the lateral arm 42 of the feed-rocker 43 mounted upon the fulcrum-pin 44 and carrying a pin 45 upon which are secured the perforated lugs 46 of the feed-bar 47 carrying the feed-dog 48. The pin 45 has fixed thereto the lateral arm 49 provided with the socket 50 within which is secured the slide-pin 51 fitted within a depending transverse guiding boss 52 of the loose collar 53 embracing the feed-actuating eccentric 54 upon the collar 55 fixed upon the main-shaft 11. The collar 39 is confined against endwise movement between the flange 36 of the eccentric 37 and a collar 56 fixed upon the main-shaft extension l1 by means of set-screws The feed-dog 48 operates in the usual manner through the aperture 58 in the throat-plate 59 in con junction with the presser-foot 60 upon the Presser-bar 61 journaled in the head a of the bracket-arm and normally pressed downwardly by means of the spring 62.

In threading the machine, the needlethread is led from the source of supply to the tension 63 upon the front of the bracketarm and thence through the guide-loop 64 and the eye 65 of the take-up lever 66 downwardly to the eye of the needle. The looperthread is led from its source of supply through the tension device 67 upon the rear of the bracket-arm and thence downwardly beneath the work-plate and through the fixed guide-eye 68 upon the bottom of the same to the guide-eye 35 at the heel of the looper and thence to the eye 33 in the looper point.

In the position of the parts represented in Figs. 1, 2 and 3, the needle has just completed its descent and the looper is in ex treme retracted position at which time it is performing its needle-avoiding movement toward the right. As the machine continues its operation, the needle begins its ascent and the loo-per moves past the righthand side of the needle in seizing a threadloop therefrom. After arriving near extreme advance position, the looper performs successively its sidewise movement to the left and retrograde movement to bring its eyed forward portion to the left of the needle-path, and the needle point descends slightly in advance of the thread-eye 33 and at the right of the looper-blade to engage the looper-thread between the looper point and the work, retaining the looper-thread loop thus formed until the subsequent advance of the looper into the succeeding needle-thread loop. The degree of inclination of the slide-pin 21 and the guiding boss 19 obviously determines the extent of sidewise movement of the looper-blade, and the movement of the guiding boss 19 toward and from the looper-sustaining pin or arbor 26, in addition to its revolving motion upon the shaft 11, serves to produce a quick advance of the looper in seizing the threadloops from the needle and a retarded retiring movement. The accelerated advance movement of the looper point toward the needle path permits of a comparatively short movement of the needle-eye beneath the throat-plate and the formation of a correspondingly small needle-thread loop which is promptly seized by the looper in the initial portion of the needles ascending move- Inent, while the retarded retrograde movement of the looper affords ample time for the completion of the ascent of the needle and the descent of its point in front of the looper-thread leading from the looper-eye to the work while the previously formed needle-thread loop is detained upon the blade of the looper. As the slide-pin 21 is fixed to the sleeve 25 sustaining the looper-carrying arm, this pin obviously maintains at all times the same angular relation with the supporting pin or support 26 for the loopercarrier and also bears a fixed angular rela tion with the shaft 11, although it moves bodily toward and from the latter in the operation of the mechanism.

The lateral curvature of the looper-blade 32 to the right, as represented more particularly in Figs. 3 and 6, serves to insure the deflection of the needle-thread loop extending from the throat-plate and around the looper-blade so as to prevent the entrance of the needle into the same in its descent for presentation of the succeeding needle-thread loop for seizure by the looper.

The looper-blade 32 is bowed laterally upon the side opposite the needle-path when the looper is advancing to seize ,a needlethread loop, and the lateral guide-ear 34 at the heel of the looperblade is arranged upon the same side. By this means, the needle-thread may be led through the guideeye 35 above or beneath the bowed portion of the looper-blade 32 to the opposite side of the looperpoint through the looper-eye 33 so as to lie against the face of the forward portion of the looper-blade which retains the needle-thread loop at the time the needle is descending for engagement with the loopenthread. The confinement of the loper-thread thus against the face of the looper-blade serves to avoid the production of a wedge-shaped support for the needlethread loop comprising the convex face of the looper-blade and the looper-thread intermediate the thread-eyes in the point and heel of the looper-blade, which would tend to shed the needle-thread loop forwardly and advance the same into the needle-path as the needle-point descends for engagement with the looper-thread.

It is obvious that the shape and position of the looper-blade in its described movements will determine whether or not the needle will pass through loops of its own thread in its descent for presentation of a succeeding loop for seizure by the looper, and it is therefore evident that the looperblade may be threaded or non-threaded for production respectively of a double-thread or single-thread chain-stitch seam.

From the foregoing description, it is evi dent that the particular means of mounting the looper and the details of construction and arrangement of its actuating means are not essentials of the present improvement, although the embodiment of the invention herein shown and described is deemed preferable.

Having thus set forth the nature of the invention, what I claim herein is 1. The combination with a reciprocating needle and a shaft carrying an actuating.

member fixed thereon, of a looper-carrier mounted for movement longitudinally and transversely of said shaft, a looper mounted thereon for cooperation with said needle in the production of stitches, a following member arranged in operative relation with said actuating member and movable transversely of but confined against movement longitudinally of said shaft, and an operative connection between said following member and the looper-carrier and comprising a slide-pin and a guideway fitted thereto and each rigidly secured to a different one of said connected parts and inclined relatively to the axis of said shaft.

2. The combination with a reciprocating needle and a rotary shaft provided with an eccentric, of a looper-carrier mounted for movement longitudinally and transversely of said shaft, a looper mounted thereon for cooperation with said needle in the production of stitches, a loose collar fitted upon said eccentric and confined against endwise movement thereon, and a sliding connection between said looper-carrier and said loose collar and comprising a pin and a guideway fitted thereto and each carried by a difierent one of said connected parts and inclined relatively to the aXis of said shaft.

3. The combination with a reciprocating needle and a rotary shaft provided with an eccentric, of a looper-carrier mounted for movement longitudinally and transversely of said shaft, a looper mounted thereon with its blade arranged transversely to said shaft and adapted for cooperation with said needle in the production of stitches, a. loose collar fitted upon said eccentric and confined against endwise movement thereon, and a sliding connection between the said loopercarrier and said loose collar and comprising a pin and a guideway fitted thereto and each carried by a different one of said connected parts and inclined relatively to the axis of said shaft.

i. The combination with a reciprocating needle and a rotary shaft provided with an eccentric, of a looper-carrier, a support therefor arranged substantially parallel with said shaft and upon which said loopercarrier is adapted to oscillate and to slide endwise of the same, a looper mounted upon said carrier for cooperation with said needle in the production of stitches, a loose collar fitted upon said eccentric and confined against endwise movement thereon, and a sliding connection between said looper-carrier and said loose'collar and comprising a pin and a guideway fitted thereto and each carried by a different one of said connected parts and inclined relatively to the axis of said shaft.

5. The combination with a reciprocating needle and a rotary shaft provided with an eccentric, of a looper-carrier mounted for movement longitudinally and transversely of said shaft, a looper mounted thereon for cooperation with said needle in the production of stitches, a loose collar fitted upon said eccentric and confined against endwise movement thereon and formed with a lateral boss having a. guide-aperture inclined to the axis of said shaft, and a slide-pin similarly inclined and entering the aperture of said boss and secured to said looper-carrier.

6. The combination with a reciprocating needle and a rotary shaft provided with an eccentric, of a looper-carrier mounted for movement longitudinally and transversely of said shaft, a looper mounted thereon for cooperation with said needle in the production of stitches and formed with an eye-pointed blade bowed laterally toward the side opposite the needle-path in its loop-seizing movement, a loose collar fitted upon said eccentric and confined against movement thereon lengthwise of said shaft, and a connection between said loopercarrier and said loose collar and comprising a pin and a guideway fitted thereto and each carried by a different one of said connected parts and inclined relatively to the axis of said shaft.

7 The combination with a shaft, of an actuating member mounted thereon, aloopercarrier, a looper sustained thereby, a support independent of said shaft upon which the looper-carrier is movable both longitudinally and transversely of said shaft, and looper operating means connecting the looper-carrier with said actuating member and comprising an element maintained in fixed angular relation with said shaft and with said support and confined against movement lengthwise of said shaft.

8. The combination with a shaft, of an actuating member mounted thereon, a loopercarrier, a looper sustained thereby, a support disposed parallel with the shaft upon which the looper-carrier is movable both longitudinally and transversely of said shaft, and looper-operating means consisting of a single connection between said actuating memher and the looper-carrier and comprising an element embracing and confined against movement axially of said actuating member for imparting to the looper-carrier each of its operative movements.

9. The combination with a shaft, of an actuating member mounted thereon, a loopercarrier, a looper sustained thereby, a support disposed parallel with the shaft upon which the looper-carrier is mounted for sliding and v In testimony whereof, I have signed my osclllatory movements, and looper-operatlng name to thls specification, 1n the presence of means Comprising an element elnbraclng two subserlbing wltnesses.

said actuating member and having a sliding ALBERT H. DE VOE. 5 connection with the looper-can'ier which Witnesses:

connection maintains a fixed angular rela- H. A. KORNEMANN,

tion with said. shaft. W. P. STEWART.

Copier of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, 1). (3.

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