US1168536A - Intermittent feed mechanism for sewing-machines. - Google Patents

Description

A. MORLEY.

INTERMITTENT FEED MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JAN. 3, 19.14.

Patented Jams, 1916.

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INTERMITTENT FEED MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JAN.8,1914.

1,168,536. Patented Ja11.18,1916.

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Specification of Letters latent.

Patented Jan. 1% 1916.

Application filed January 8, 1914. Serial No. 810,925.,

To all whom it may concern Be it known that T, ALBERT MORLEY, a citizen of the United States, and a resident of Three @aks, in the county of Berrien and certain speed. For example in the case of a sewing machine the cloth feeding member usually travels through an orbit during part of which the cloth is engaged and advanced by the member. It has been found that such bodily traveling member will not operate properly when the speed increases beyond a certain. limit, this being probably due to inertia effect and vibration. causedby the swiftly traveling body. Pawl and ratch intermittent drive mechanism has also been used but the same defects have been found.

The main object of my invention is therefore to provide intermittent drive mechanism which is devoid of bodily traveling parts and which is more perfectly balanced to thereby reduce vibration, and which will operate with equal efficiency at'any speed.

Although my improved intermittent drive mechanism may be used. efiiciently and ad vantageously on other machines I have found it of particular advantage and utility for controlling the cloth feed in a sewing machine and I shall therefore describe the invention in connection with such machine.

In the accompanying drawings Figure 1 is a rear elevational view of a sewing machine head, Fig. 2 is a plan View from plane 22, Fig. 1, Fig. 3 is a sectional view on plane 3-3 Fig. 1, Fig. 4: is a side elevational view of the sewing and feeding partsv with the guide table in section, and Fig. 5 is a front elevational view of a spiral drive member.

shaft 16 carrying at its end the drive pulley 17 from which extends a crank pin 18 con nected by connecting rod 19 with the crank end 20 of the rock shaft 21 whose other end is connected by suitable mechanism with the needle bar- 14 to effect vertical reciprocation thereof in the well known manner. The other end of the main shaft carries the rotary looper 22 which coiiperates in the well known manner with a needle 23 secured in the lower end of the needle bar, the needle reciprocating through an opening 24 in the guide table or plate 25 secured to the base 10. The lower end of the bar 15 carries a frame 26 from which extends thepresser foot 27 suitably connected therewith, this presser foot having the usual passageway 28 for the needle. To the rear of the needle line a feed mechanism is usually provided for advancing the cloth after each stitching operation.

For the purposes of my invention the feeding members comprise a rotary drum 29 and a roller 30 held against the top thereof. The drum 29 has the points 29' and projects upwardly beyond the top of guide plate 25 through opening 31 therein. The roller 30 is journaled in the bifurcated extension-32 on frame 26 carried by the presser foot bar, a spring 33 encircling this bar between the collar 34 thereon and the top lug 12 of the machine frame serving to yieldingly hold the roller against the drum to securely hold cloth or other fabric tothe drum in order that the cloth or fabric will be drawn along and properly fed. Such engagement may be frictional or more positive by means of the points 29 on the drum.

The mechanism for intermittently rotating the drum 29 to rotate the drum only during the periods that the needle is out of the cloth, is clearly illustrated. The drum is securedto the end of a shaft 35 journaled at its outer end in the base 10 and at its inner end in a frame or housing 10 extending into the pocket or open space 36 in the base l0,through which the main shaft 16 extends. The inner end of the shaft 35 carries a skew gear 37 which meshes with a skew gear 38 mounted on the rear end of the transverse shaft 39 journaled in a bracket 40, the front end of this shaft 39 carrying a plane gear 41. The frame 10 also journals the main drive shaft 16 and within the frame this shaft carries a disk 42 from whose face extends a tated to turn the drum only cloth. The spiral ridge would therefore ex- This ridge extends spirally in order that when the disk is revolved the gear 41 and the feed drum are rotated. However, as the drumshould be rotated to advance the cloth only during the time that the needle is out of the cloth, the extentof the spiral is designed accordingly, the gear being then roy when the needle is raised above the cloth and remaining at rest while the needle is passing through the tend less than 360 degrees'but in order to lock the gear against rotation or displacement when it should remain at rest, the ridge at either of the ends 43* or 13 is extended along the arc of a circle centered at the axis of shaft 16 in order to fill out 360 degrees. Preferably, however, both these ends are extended along circular arcs to overlap with a radial pitch displacement corresponding to the pitch of the gear 41. The gear then remains-atnrest and is rigidly locked against displacement when the circular sections of the ridge are in cooperation therewith and is rotated only when the spiral section of the ridge cooperates therewith. One of the overlapping ends will also act to hold the gear in proper position to receive the oncoming other end. The gear wheel and gear ridge are therefore always in mesh and the spiral section of the ridge causes the gear to be started without jar, the feed drum therefore gradually starting the cloth and preventing injury thereto. Inertia effect is entirely eliminated as none of the parts travel bodily, the feed drum rotating on its axis and the gear ridge and gear wheel likewise rotating on their respective axes, and the balance is perfect. The machine can therefore be driven at any speed and the cloth feed mechanism will under all conditions operate smoothly, accurately and efliciently. Any peripheral travel of the feedv drum can be obtained by proper design of the spiral pitch, and the durationof such travel can be made anvthing by properly designing the length of the spiral ridge, and such travel of the drum can betimed with reference to the movements of the needle by rotationally adjusting the disk 42 on the drive shaft 16. The mechanism also comprises a minimum number of. parts which can be readily kept in order. I do not desire to be limited to the exact construction and arrangement shown and described as there may be changes and modifications which would still come within the scope .of the invention.

I claim as follows:

In a sewing'machine, the combination with a knurled feed drum, of a roller, a presser foot carrying said roller and said roller cooperating with said feed drum to hold fabric therebetween, a shaft on which the feed drum is secured, a skew gear on" said shaft, a transverse shaft and a skew gear thereon meshing with the skew. gear on the feed drum shaft, a plane gear on said transverse shaft, a main driving shaft and a disk thereon, said disk having a gear ridge extending from one of its faces and around its axis, said ridge being continuous with its ends overlapping and pitch displaced in correspondence with'the pitch ofsaid gear, said overlapping ends extending in the arcs of circles and the remainder of said ridge continually varying in radius whereby said feed drum will be rotated When said gear is in mesh with thevarying radius section of said ridge and will be locked against rotation when said geaf is in mesh with the circular sections of said disk.

In witness whereof, I hereunto subscribe my name this second day of January, 1914.

ALBERT MORLEY.

Witnesses:

MORRIS G. MCGAWN, FRED EDINGER.

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