AMERICAN INSTITUTE. 



Ill 



and wliicli are respectively numbered as follows: 1, 1, the bed 

 plate, supporting 2, 2, the front standards; 3, 3, the back stand- 

 ards; 4, is the arbor upon which are 5, the rotating hook; 6, the 

 feed cam; 7, the band pulley; 8, the eccentric ring; 9, the spool- 

 ing spindle; 10, the feed bar; 11, 11, ears of the feed bar; 12, 

 the spiral feed spring, working between the left front standard 

 and the left ear of the feed bar; 13, the feed tongue slotted in the 

 feed bar, and furnished with 14, feed points; 15, the double con- 

 vex metallic bobbin, containing the lower thread and held in the 

 concavity of the rotating hook, by 16, the bobbin ring mounted 

 upon 17, the ring bar, sliding in a groove in the bed plate and 

 held by 18, the thumb screw; 19 is the fixed arm, projecting from 

 the back standard and supporting 20, the cloth presser, attached 

 to the piston in 21, the piston cylinder; 22 is the thumb screw of 

 the cloth presser; 23, the lever of the cloth presser; 24, is the 

 needle rocker, pivoted upon 25, 25, the centre screws; 26, the 

 short arm of the rocker, hinged by 27 to 28, the connecting rod. 



Upon the rocker is 29, the needle arm bearing, 30, the thread 

 •spool; 31, the spool brake; 32, the brake screw; 33, 33, the- 

 thread eyelets; 34, the needle yoke; 35, the needle. 36 is the loop 

 check; 37, the spool pin; 38, a spool of thread; 39, thread guide; 

 40, tension pulley; 41, volute tension spring; 42, large seam 

 gauge; 43, gauge screw; 44, screw for small gauge; 45, the fab- 

 ric sewed ; 46, the cloth plate ; 47, table screw holes ; 52, feed 

 slots ; 53, set screw ; 54, feed stop ; 55, stop pivot ; 56, thread 

 guard; 57, thread hold; 58, small gauge; 59, spiral spring of the 

 cloth presser; 60, needle hole. 



In constructing the machine, the lower surface of the bed plate 

 is planed with perfect exactness, and made the plane to which all 

 the planes and lines of the machine are adjusted. Tlie standards 

 2, 2, are leveled to a plane parallel with the plane of the bed- 

 plate, at a fixed height above it, and pierced in another parallel 

 line for the arbor, 4, and grooved in a parallel line for the feed 

 bar, 10. The bed plate is grooved in the same line for the slide 

 bar, 17. The standards, 3, 3, are pierced parallel to the line of 

 piercing 2, 2, for the centre screws, 25, 25; and the arbor 4, and 

 the rocker, 24, are adjusted parallel to each other and to the plane 

 [Am. Inst.] 12 



