US2687704A

US2687704A - Upper main shaft drive mounting for sewing machine feed rollers

Info

Publication number: US2687704A
Application number: US300582A
Authority: US
Inventors: Galkin Joseph
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-07-24
Filing date: 1952-07-24
Publication date: 1954-08-31
Anticipated expiration: 1971-08-31

Description

Aug. 31, 1954 GALKlN 2,687,704

UPPER MAIN SHAFT DRIVE MOUNTING FOR SEWING MACHINE FEED ROLLERS Filed July 24, 1952 3 Sheets-Sheet l FIG] JOSEPH GALKIN INVENTOR BMW ATTDRNEY g- 1954 JKGALKIN 2,687,704

UPPER MAIN SHAFT DRIVE MOUNTING FOR SEWING MACHINE FEED ROLLERS Filed July 24, 1952 V 3 Sheets-Sheet 2 JOSEPH GALKIN INVENTOR BQYM 'ATTORNEY Aug. 31, 1954 J GALKm 2,687,704

UPPER MAIN SHAFT DRIVE MOUNTING I FOR SEWING MACHINE FEED ROLLERS Flled July 24, 1952 3 Sheets-Sheet 3 FIG.3

at 25 B JOSEPH GALKIN INVENTOR WWW ATTORNEY Patented Aug. 31, 1954 UPPER MAIN SHAFT D SEWING MACHIN RIVE MOUNTING FOR E FEED ROLLERS Joseph Galkin, New York, N. Y. Application July 24, 1952, Serial No. 300,582

1 Claim.

This invention relates to sewing machines having superposed feed rollers to augment the feeding of the fabric by the feed-dog.

In prior practice, attempts have been made to drive puller feed rollers for sewing machines to make it possible to work on heavy fabric garments, such as overalls, by driving the rollers With a drive shaft overthrow. In other prior designs of feed roller drives, clutch mechanisms,

An object mounting for auxiliary feeding rollers driven Reference will now be had to the drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in which:

Figure 1 is a rear view of a fragmentary portion of a sewing machine to which my invention is applied.

Figure 2 is a cross-sectional view taken on line 2-2 in Figure 1.

Figure 3 is a cross-sectional view taken on line 3-3 in Figure 2.

Figure 4 is a cross-sectional view taken on line l l in Figure 3.

Figure 5 is a cross-sectional view taken on line 5-5 in Figure 3.

In the illustrated embodiment of the invention,

unencumbered sewing tion resides in the fact that the entire area above the work-supporting base and between the horizontal arm I3 and the standard I 2 is clear for operations.

The mounting It comprises an upright guide- Way member I! which is suitably supported by screws I8 to the rear surface of the upright head I4. The guideway member I! has a vertical guideway I 9 in which a carrier member 28 is mounted for vertical movements. At the upper end of the carrier member 20 is a rod ill on which a coil spring 22 is mounted. The spring reacts at its upper end against the lower surface of an adjusting screw 23 threaded in a lateral extenand forces the carrier member 20 in a downward direction.

The auxiliary feeding rollers consist of an lower roller 26.

roller 25 from getting out of alignment with the lower roller '26.

For

suitably secured to the shaft 21.

The drive mounting for the feed rollers comprises an eccentric 37 on the main shaft I5. An arm or strap link 38 has its strap end portion 39 in circumscribing and contacting engagement with the eccentric 31. The other end 40 of the strap link 38 is vibratably connected to a stud 4| having a ball shaped end.

The stud 4| has a threaded end secured to the a rock-shaft a bracket 4'! which is fixed to the rear portion of the overhanging member I2 by screws 48. The lever is fixed to the rock-shaft .upper feed-roller stub shaft 21 46 by a screw 49. The lever 45 has an upper arm 50 and a lower arm I.

The upper and lower arms 5%], 5!, lie in spacedapart relation in different planes. The arms are caused to be in considerably spaced-apart relation from each other by an elongated hub 52 connecting the arms. The result is that the lower arm 5| is brought closer to the upper feed roller 25 than the upper arm 50 in a manner as to leave a maximum space above the work supporting base clear for operations and the upper roller drive shaft of minimum length.

The lower end of the lever 65 connected at 56 to one end of a horizontal link 51. The other end of the link 51 is pivotally connected at 58 to the crank 36.

In the head is is journaled a needle bar 60 carrying a needle 5|. The material worked upon is held down by a presser-foot 52 carried by a presser-bar 53. The presser-foot rests on a cloth plate M secured to and above the work supporting base H. The material is moved across the work support by a feed-dog which is moved back and f ort'h and up and down, as is well known in the art.

Figure 3 is a cross-sectional view taken on line 33 in Figure 2 and shows the shaft 21 rotatably supported in bearings M in the forked housing 28. The puller-feed roller 25 is freely rotatably mounted on the roller shaft 21, and shown in cross-section.

The puller-feed roller 25 has a bore 65 in which an oscillating clutching detent carrier 65 is rotatably mounted. The carrier 65 has a hub 61. Mounted on the hub 51 is a washer 6t and a collar 69. A screw it threaded in the collar 69 and the hub t1 secures the carrier 65 to the shaft 2'! (Figure 3).

As shown in Figure 4, the detent carrier 55 has peripheral cavities E2 in each of which a ball or roller detent i3 and a spring M is mounted in a manner as to cause the detent to be wedged between a cam surface in in a cavity 72 and the peripheral surface defining the bore 55.

The detent carrier 55 and the detent E3 and spring M mounted inside the bore 55 of the feed roller 25, constitute a friction clutch 15.

is pivotally Stepbystep rotation of the feed-roller 25 in synchronism with the feed-dog of the sewing machine is effected by the friction clutch 15. The clutch is actuated by the crank 38, the lever 45 and the arm 33 in operative engagement with the eccentric 3? on the shaft i5.

' In order to prevent reverse movement of the feed-roller 25, I have provided a braking detent carrier 8 freely mounted within a bore 8| in the feed-roller 25, as shown in Figure 5. The braking detent carrier 85)) is secured to a disk 82 by a screw 83 and to one side arm 85 of the forked housing 28by a screw 85.

The clutch detent carrier 65 and the braking detent carrier 89 are mounted in the feed-roller 25 to work in opposite directions and may be in the form shown and described in Patent No. 1,985,406, issued to Nathan B. Galkin, dated December 25, 193 s.

It is to be noted that the crank 35 has an elongated slot '85 which permits slidable movement therein of the screw 53. It is thus possible to adjust the screw 58 in relation to the slot 85 and to increase or decrease the throw of the link 51 for varying the movements of the clutch I6 and the roller 25.

It will be seen that due to the fact that the terminates directly at the outer face of the crank 36, that the entire area above the work-supporting base and between the head and the standard is clear for unencumbered operations.

In accordance with the patent statutes I have described and illustrated the preferred embodiment of my invention, but it will be understood that various changes and modifications can be made therein without departing from the spirit of the invention as defined by the appended claim.

I claim:

In a sewing machine having a work-supporting base, an upright tubular standard extending from said base and having an upper overhanging member terminating in an upright head, a sewing mechanism, a main drive shaft in said overhanging upper member, auxiliary feeding mechanism including a air of cooperating upper and lower feed rollers, one of said feed rollers being rotatably mounted below said work-supporting base and extending upwardly slightly above said base, said upper roller being internally bored at both ends, an upright guideway member secured to said head rearwardly thereof, and having a spring-pressed carrier member slidably mounted thereon, a forked housing supported by said carrier member, said upper feed roller being rotatably mounted on a horizontal stub-shaft in said housing and resiliently supported on said carrier member for vertical movements rearward of said head and into pressure contacting relation with said lower feed roller, a crank secured to said upper feed roller shaft, drive means entirely clear of said base and in considerably spaced-apart relation from said upright standard for actuating said upper feed roller during its up and down movements, comprising an eccentric on said upper main shaft, a roller actuating arm having a strap in circumscribing and. contacting engagement with said eccentric, an opening in the rear portion of said overhanging member closely adjacent said roller, and permitting said arm to pass therethrough in alignment with said eccentric for actuation by said eccentric, a modified bell-crank lever iulcrumed on said head rearwardly thereof and connected at its upper end to said arm, said lever having upper and lower arms in spaced-apart relation, said upper arm being connected to said actuating arm, a link connecting the lower arm of said lever with said upper feed roller crank, a springpressed roller friction drive clutch in one of said bores and driven by said stub-shaft, a springpressed roller friction brake clutch in the other of said bores, and means for adjusting said link to actuate said clutch means and said rollers in timed relation with said sewing mechanism, said upper feed roller stub shaft terminating directly at the outer face of said crank, and the entire area above said work-supporting base and between said head and said standard being clear for unencumbered operations.

References Cited in the file of this patent UNITED STATES PATENTS