US1903932A

US1903932A - Adjustable throw eccentric

Info

Publication number: US1903932A
Application number: US575880A
Authority: US
Inventors: Charles W Mueller
Original assignee: Lewis Invisible Stitch Machine Co
Current assignee: Lewis Invisible Stitch Machine Co
Priority date: 1931-11-18
Filing date: 1931-11-18
Publication date: 1933-04-18
Anticipated expiration: 1950-04-18

Description

April 18, 1933. y C. W. MUELLER ADJUSTABLE THROW ECCENTRIG Filed Nov. 18, 1931 2 Shees-Sluaerl l 5 v 1 4 75 /5 /5 W j' /9 8 -r-'n f- /l i 3 i 7 7 I W i :f 79

II ,7, .35 ya nventor;

Gttome I April 18, 1933. C' w MUELLER 1,903,932

ADJUSTABLE THROW ECCENTRI C Filed Nov.` 18,1931 2 sheets-sheet 2 linventot',

meme Apr. 1a, vlas?.

UNITED Is'ra'rlas PATENT oFF-ICE CHABLIS W. IUELLEB, Ol' ST. LOUIS, ISSOUBI, ASSIGNOR TO LEWIS INVISIBLE STITCH COMPANY, Ol' ST. LOUIS, MISSOURI, CORPORATION O F MAINE ADJUSTABLE THROW ECCENTBIC Application med November 18, 1931. SeriaIIo. 575,880.

This. invention relates generally to new and useful improvements in adjustable throw eccentrics, althou h the invention is particularly intende for use in sewing machines for varying the feed stroke of the feed dog.

Among the several objects of the invention are to provide an adjustable eccentric assembly wherein the throw of the eccentric may be readily adjusted and wherein the eccentric when adjusted will be retained against accidental displacement; to provide indicating means for easily observing the amount of adjustment given -to the eccentric; to provide such an assembly with a comparatively few number of parts; and to provide such a construction which is easy to assemble or disassemble.

With these and other objects in view which will more fully appear, the nature of the invention will be more clearly understood by following the description, the appended claims, and the several views illustrated in the accompanying drawings.

In the drawings Figure 1 is a plan view of a construction embodying my invention, f Figurei2 is a 'longitudinal sectional view thereof, V

Figure 3 is a right hand eleva-tion of the assembly,

Figure 4 is a sectional view taken on the line 4-4 of Figure 1,

Figure 5 is a sectional view 'taken on the line 5-5 of Figure 1 Figure 6 `is a left hand -end elevation of the assembly,

Figure 7 is a pers ective view showlng the parts of the assem ly in separated relation,

Figure 8 is a detail sectional view showing the frictional connection between the driving eccentric and the adjustable eccentric, and

Figure 9 is a detail' section showing the pivotalconnection between the driving link and the driving eccentric.

Like reference numerals designate corresponding parts throughout the several res of the drawings.

y invention comprises a shaft 5 having a driving disc 6 mounted thereon and rigidly secured thereto through the medium of an eccentric 7 which is integral with the v'disc and is fixed to the shaft by a set screw 8. A hub 9 is integral with the disc 6 vand extends laterally therefrom in a direction op osite the eccentric 7, and the hub is providedJ with

angularfseats

10, 10 which project inwardly from .the outer edge thereof. Rotatably mounted on the hub 9 relative to the shaft 5, is a feed adjusting or driving eccentric 11 having a disc 12 integral with the end thereof opposite the driving disc 6. A sewing machine feed or driven eccentric 13 having a bearing opening 14 is fitted about the feed adjusting eccentric 11. Formed in the inner face of the disc 6 along side the feed eccentric 13, is a recess 14a in which one end of a driving link 15 is pivotally connected to the disc 6 by a pivot screw 16. .The other end 70 ofthe link 15 is pivotally connected to the feed eccentric 13 by a pin 17 which is fixed to the eccentric and projects into a pivot opening 18 formed in the link, thus forming a separable connection between the eccentric and the link. The major axis of the link which extends between the

pivots

16 and 18 is positioned tangential to an imaginary circle having for its center the axis of the shaft 5. The recess 14:l isof sufficient depth to permit the link 15 to swing about its pivot 16 forv a limited extent. It will therefore be seen that when the disc 12 is turned about the shaft 5, the feed adjusting eccentric 11 will be turned therewith and the feed travel eccentric 13 will be moved radially of the shaft 5 to vary the throw thereof, subject however to a slight distortion due tothe 2-

point connections

15, 16, 17 between said eccentric and the driving disc 6.

The periphery of the adjusting disc 12 is provided with spaced numerals 19, such as 3, 4, 5, etc., which are adapted to indicate the amount of throw of the eccentric 13 in different positions of adjustment of the disc 12. An indicator disc 20 is mounted on` the shaft 5 on the side of the adjusting disc 12 opposite the feed travel eccentric 13, and is provided with a hub' 21 which lits within the bearing opening of the disc 12 and is pro 100 vided with longitudinally extending integral lugs 22 which engage in the seats 10 of the hub 9 of the driving disc.6 to thereby retain the indicator disc against rotation relative to the shaft 5. A clamping collar 23 is placed against the outer face of the disc 20 and is secured to the shaft 5 by a set screw 24.

In order to retain the feed travel eccentric 13 in different positions of radial adjustment or throw, I have provided the inner face of the disc 12 with anl arcuate series of seats 24 which registerradially with the respective numerals 19, and have mounted in the ecce'ntric 13 a spring pressed plunger 25 which is adapted to engage any one of the seats 24a and thereby frictionally retain the eccentric in its adjusted position.

The indicator disc 20 is provided with a finger 26 which overhangs the periphery of the disc 12 and cooperates with the numerals 19 to assist the operator in reading the position of adjustment of the feed travel eccentric 13. It will therefore be seen that the indicator finger 26 and the indicator disc 20 have a separable interlocking connection 22, l0 with the shaft 5 and consequently said finger and disc are supported on the shaft to rotate therewith. From the foregoing it will be observed that the parts may be readily assembled or disassembled; that the assembljT is composed of comparatively few parts, and is therefore cheap to manufacture.

Itis of course to be understood that the details of structure and arrangements of parts may be variously changed and modified without departingfrom the spirit and scope of my invention.

I claim 1. In an adjustable throw eccentric, the combination with a shaft, of a driving disc fixed to the shaft, an adjusting eccentric ro tatable about the shaft and located along side the driving disc, an adjusting disc fixe to the adjusting eccentric and located at the end thereof opposite the driving disc, a driv-4 ing eccentric surrounding the adjusting eccentric, a driving link connection between the driving disc and the driving eccentric, and means cooperating with the adjusting disc and the drivin eccentric for retainin the same against re ative movement in di erent positions of adjustment of the adjusting eccentric.

2. In an adjustable throw eccentric, the combination with a shaft, of a driving disc fixed to the shaft, an adjusting eccentric rotatable about the shaft andlocated along side the driving disc, an adjusting disc fixed to the adjusting eccentric and located at the end thereof opposite thedriving. disc, a driving eccentric surrounding the adjusting eccentric, a driving link connection between the driving disc and the driving eccentric, the major axis of the link being positioned tanthe adjusting eccentric and located at the end thereof opposite the driving disc, a driv-v ing eccentric surrounding the adjusting eccentric, said driving disc being provided with a recess in register with the driving eccentric, a driving link located in said recess and having pivotal connections at its ends with the driving disc and the driving eccentric, and means cooperatingwith the adjusting disc and the driving eccentric for retaining the same against relative movement in different positions of adjustment of the adjust-y ing eccentric.

4. In an adjustable throw eccentric, the combination with a shaft, of a driving disc fixed to the shaft, an adjusting eccentric rotatable about the shaft and located along sidel the driving disc, an adjusting disc fixed to the adjusting eccentric and located at the end thereof opposite the driving disc, a driving eccentric surrounding the adjusting eccentric, said driving disc being provided with a recess in registerwith the driving eccentric, a driving link located in said recess and having pivotal connections at its ends with the driving disc and the driving eccentric, the major axis of the link being positioned tangential to an imaginary circle having for its center the axis of the shaft, and means cooperating with'the adjusting disc and the driving eccentric for retaining the same against relative movement in different positions of adjustment of the adjusting eccentric.

5. In an adjustable throw eccentric, the combination with a shaft, of a driving disc fixed to the shaft, an adjusting eccentric rotatable about the shaft and located along side the driving disc, an adjusting disc fixed to the adjusting eccentric and located at the end thereof opposite the driving disc, a driving eccentric surrounding the adjusting eccentric, a pivotal connection between the driving disc and the driving eccentric, the peripheryl of the adjusting disc being provided with a series of spaced indicating numerals, means cooperating with the adjusting disc and the driving eccentric for retainingv the same against relative movement indifferent posiica tions of adjustment of the ladjusting eccentric, and an indicator disc mounted on the lao periphery of the adjusting disc `for coopera.- tion with the numerals on the periphery of` said disc.

6. In an adjustable throw eccentric, the combination with a shaft, of a driving disc fixed to the shaft, an adjusting eccentric rotatable about the shaft and located along side the driving disc, an adjustin disc fixed to the adjusting eccentric and ocated at the end thereof opposite the driving disc, a driving eccentric surrounding the adjusting eccentric, a pivotal connection between the driving disc and the driving eccentric, the peripher of the adjusting disc being provided wit a series of spaced indicating numerals, the inner face of the adjusting disc being provided with an arcuate series of seats arranged in radial relation with the respective numerals on the disc, a spring pressed plunger mounted in the driving eccentric for cooperation with any one of said seats to rictionally retain the adjusting eccentric and the driving eccentric against relative rotation, and indicating means rotatable with the shaft and cooperating with the numerals on the periphery of the adjusting disc.

7. In an adjustable throw eccentric, the combination with a shaft, of a driving disc fixed to the shaft to rotate therewith and provided with a h ub having an angular seat extending inwardly from its outer end, an adjusting eccentric rotatably mounted on the hub, an adjusting disc fixed to the end of the f adjusting eccentric opposite the driving disc and provided on its periphery with a series of spaced indicating numerals, a driving eccentric surrounding and fitting the adjusting eccentric, the driving disc having a recess in register with the driving eccentric, a driving link located in said recess and having one end pivotally connected to said driving disc, the other end of the link being provided with a pivot opening, a pin ixed to the driving eccentric and removably fitted in the pivot openin of the link, the major axis of the link being positioned tangential to an imaginary circle having or its center the axis -of the shaft, the inner face of the adjusting disc being provided' with an arcuate series of seats arranged in radial relation with respect to the numerals on the disc, a spring pressed plunger mounted in the driving eccentric for engaging any one of said seats to frictionally retain the driving eccentric against accidental movement relative to the adjusting eccentric, an indicator disc mounted on the shaft on the side of the adjusting disc opposite the di'iving eccentric and provided with a hub formed with a longitudinally extending lug having separable interlocking connection with the angular seat of the driving disc hub, an'indicator finger mounted on the shaft to move therewith and overhanging the periphery of the adjusting disc for cooperation with the indicating numerals thereon, and a clamping collar removably fixed to the shaft and bearin against the indicator disc.

n testimony whereof I ailix my signature.

CHARLES W. `MUELLER.