US2131621A - Sewing machine - Google Patents

Description

p 7, 1938. P. P. GREICIUS 2,131,621

SEWING MACHINE Filed May 26, 1937 I 60 30 u /Z INVENTOR ATTO R N EYS Patented Sept. 27, 1938 UNITED STATES PATl INT OFFICE SEWING MACHINE Peter P; Greicius, Chicago, Ill. Application'May 26, 1937, Serial No. 144,956

6 Claims. (01. 112-214) My invention relates to sewing'machines and The length of the feed roll 38 is substantially includes among its objects and advantages the equal to the spacing between the flanges 36.

provision of an improved feed and presser mech- Feed roll 38 is illustrated as being arranged in anism. pressure relation with a small roll 48 rotatably In the accompanying drawing: mounted on a shaft 50 having its ends supported 5 Fig. 1 is a fragmentary view of a sewing maon depending ears 52 carried by the throat plate chine showing my invention-applied thereto; l8, which plate is slotted at 54 to accommodate Fig. 2 is a view of the structure shown in Fig. the roll 48 so as to bring the latter and the feed 1 rotated.90; roll 38 into proper pressure relation. Fig. 3 is a sectional view along the line 3-3 Feed roll 38 is actuated so as to impart inter-- m of Fig. 2; mittent feeding movements to the work being Fig. 4 is a sectional view along the line 4-4 sewed. To this end the shaft 40 is provided with of Fig. 3; a reduced reach 56 upon which a ratchet wheel Fig. 5 is a sectional view along the line 5-5 58 is fixedly connected. To the rock shaft 38 I P of Fig. 4; fixedly connect an arm 60 by a screw 62'. The

Fig. 6 is a sectional view along the line 8- 6 upper end of the arm 60 is forked to provide of Fig. 5; and spaced flanges 62 between which one end of the Fig. '7 is a perspective view of a fragment of a pa 54 is pos d d p t y mounted on curtain showing the manner in which the stitchthe shaft 66 carried by the flanges 62. In Fig. 3,

-- ing may be made. I illustrate the lower end of the pawl 64 as being In the embodiment selected to illustrate my prov ded with an end 68 sh ped to av ope a invention I make use of a conventional sewing ing relation W the ratchet W eel S t machine of the zigzag lock stitching typ ch 38 rocks sufficiently far to oscillate the arm 80 as is manufactured by the Singer Manufacturing within the limits of the full and dotted line illus- Company. In Figs. 1 and 2, I illustrate the head rat e O 25 of the machine at It. The head It carries a On the flange 36 adj nt th ratch t whe l needle bar l2 to which the needle 14 is fastened. 58 I m u t a small. p is pawl s p v The bed iii of the machine carries a threat plate ally mounted on ScreW 72 a c ored in the IB having an elongated opening 20 for accomlan and a suita l sp n 4 is provid d f r modating the needle 14. Head Ill is also prour in th paw a a st the wh el- In shift n vided with a presser shaft 22 whichv carries a the arm 60 from the full to the dotted line D conventional presser foot. In the instant case I tien f the Wheel 58 Wi e ro ted 8 1 illustrate the shaft 22 as being slotted at 24 for n y fa p t the paw II to d p hin the reception of the shank 25 of the presser foot, the tooth 73, as illustrated in connection w which-shank is cut off at 28 and the presser foot tooth I8. Such engagem prevents counterremoved. rotation of the feed roll 38. At the same time A rock shaft 30 has one end rotatably sup- -the end 88 which lies behind the tooth 80 will ported in a bracket 32 attached to the head l0. a be i d tooth To hold the l 6 n on- In a conventional machine the rock shaft 30 a crating relation with the wheel 58 I connect one tuates a reciprocating spring presser blade d O a tenSiQn p ng 82 with the p and its 40 which is removed for the purpose of a o other end with the bracket 60. It will thus be dating my invention. I also remove th feed seen that'work pressed between the feed roll 38 dogs such as are used in connection with the and the bed You 43 will move intermittently n throat plate l8. The structure so far described the direction of the arrow 84 across the bed I6.

is standard equipment and need not be described Flanges 3 a e o med nte y with a wall 45 in further detail. 86 which terminates in a reach 88 having flanges My invention resides in the feed and presser 30 bored at 92 to loosely receive the rock shaft unit 34. This unit comprises spaced flanges 36 30. This shaft serves as a pivotal support only between which a feed-roll 38 is positioned. I for the unit 34. Feeding pressure on the work prefer to make thefeed roll of resilient rubber, being sewed is applied to the unit 34 through 50 and the roll is mounted on a shaft 40 rotatably the medium of the presser shaft 22 (see Fig. 5) mounted in openings 42 in the flanges 36 (see which has the portion 26 of the presser foot bear- Fig. 6). Shaft 40 is provided with a transverse ing against the wall 86, as at 28. opening for the reception of a key pin 44 lying On the forward edges of the flanges 38 I mount within a groove 46 in one end of the feed roll 38. a presser foot 94 which includes two reaches 38 5 .As the'zigzag' stitching I-I8 approaches-thegend- II8 of thecurtain hem I28,'the zigzagastitching each slotted at 88 to accommodate the screw I88 having threaded relation with its respective flange. The presser foot may be adjusted toward and away from the throat plate I8 and secured in all adjusted positions by merely tightening the screw I88. Reaches 88 are bent to provide angular reaches I82 (see Fig. 5) and horizontal reaches I84 which are connected integrally with the plate I88 bent upwardly at I88 to facilitate movement of the work underneath the ,presser foot. A bar I I8 is welded or otherwise secured to the angular reaches I82, which bar is arranged inspaced relation with the edge I I2 of the plate I88 (see Fig. 6) to provide an elongated opening II4 for accommodating the needle I4. Opening II4 registers with the elongated opening 28.

In operation, the intermittent rotation ofthework being sewed is moving in'a'jpath at'right angles to the direction in which theneedle shifts, the stitch will be of zigzag formation, as indicated at I I8 in Fig. '7. In sewing work,.'it;is (desirable that the thread be properly tied orfliastened at the beginningand end of a line oi! stitch. jsFig. 7],,

illustrates the manner in which the zigzag-stitch,- ing is completed at the finish'endnfjtheline of stitch, which is identical" with the.:'start1n8 -;lehd.

terminates at I22, and a number-gcf ,parallel stitches I24 completesthe sewingagfl The pawl 84 imparts a stitch movement to the curtain in each of its movements fromthefull to dotted lines in Fig. 3. 80 long. as the pawl 84 is direction of the arrow 84. the zigzag ,smcning approaches the end 50f the curtain of Fig. '7, the pawl 84 is manually raised out of operating f \relation with the ratchet wheel 58. Such raising of the pawl prevents further fe'eding'ofthe work arranged in operating relation with'theratchet wheel 58, the work will' continue moving in the sothat continued operation ofv the machine will form'the stitching. I24 (see Fig. '7) because of the I shifting action of the needle I4.

j-{jInS 131g. 6, I illustrate the'plate I88 as being pro- 'vided 'with a sight openingilli' which indicates the" "moment at which 4 the pawl 84 should be I out the bed roll. -In either'event therconven curtain material. fconventional feed dogs em bodysharp projectionaand the action isjsuch as ,70

v marks? and causes no mssewme were." At the fl metimathe feedroliembodies a presser i of a slightly resilient 'nature embodies an, efl'ec To Y. have shown the feed roll 88 in associationfswith raised. its the work'moves across the bed I8 and the stitching approaches theend II8, the pawl 84 is lifted as soon as the end I-I8 is visible through the opening I26. 'With 'the' endVII8 so tioned, the stitching I 24 ,will be vproperlwptis tioned with respect to 'the end.. I a

- The feed roll 88 inbeing icon'structed oi' i rubb er tiveaction on thework being sewedawnu bed roll 40, good results have been 'attained'with tional feed dogs are eliminated,"and feed ro 88 is of such shape and material as to protectth work being sewed. This isan important feature when sewing materialof many types,'-particular to leave marks on and frequently cause damage to the material being sewed; My roller i-leave function, 'butrotation of the feed roll maybe stopped at any time by merely lifting the pawl 84,

, same for use under various conditions pressure on the pin I28 will pivot the pawl 84 away from the ratchet wheel 88 against the tension of the spring 82. The spring 82 pulls the pawl into operating relation with the ratchet wheel 58 as soon as the pawl is released.

In Figs. 4, 5 and 6 1. illustrate the wall 88 as being provided with a thread cutting knife I88 which has a sharpened and hooked end I82 located slightly in the rear of the feed roll 88. As the end I I8 of the work is reached, the thread I84 is pulled laterally of the blade I88 and severed. The blade is sharpened along the edge I88 as well as along its hooked part. 5

In starting the stitching H8, the end of the material being sewed is properly positioned underneath the presser foot 84; the pawl 84 is raised; and the machine is operated to stitch the material, as indicated at I24. After the proper amount of stitching has been made, the pawl is dropped, after which movement of the material brings about the diagonal stitching H8.

Flanges 88 are provided with oil holes I48 to permit oiling of the shaft 48.

Without further elaboration, the foregoing will so fully explain my invention that others may, by applying current knowledge, readily adapt the of service.

,lclaimz' 1. In a sewing machine, the combination with a rock shaft and stitch forming mechanism, of a feed roll for intermittently moving1work in timed relation with the stitch forming mechanism, means connected with the rock shaft and 'the'feedroll for supporting the latter, and an operating connection between'the rock shaft and the feed roll for imparting intermittent motion to the latter. I 1

2. In a sewing machine, the combination with a rock shaft, 9. presser shaft and stitch forming mechanismpof a carrier pivotally mounted on the rock shaft and having afeedroll for inter- 'mittently moving work in timed relation with the stitch forming mechanism, said carrier-being arranged in pressure relation with, said: presser shaft, said .feed roll including aratch'et wheel, an arm carried by said rock shaft, and a pawl pivotally connected with said arm and operatively connected with the ratchet wheel for intermittently rotating the feed roll. 1

3. In -a sewing machine of the zigzag lock stitching type, the combination with a rock shaft and stitch'forming mechanism, of a carrier mov- ;ably mounted on the rock shaft, and having a feed roll for intermittently moving work in timed relation with the stitch forming mechanism, eans connected with the rock shaft and enaged; with the feed rollfor actuating the latter,

.to 'inipart intermittent. motion thereto," means for olding the feed roll in pressure relation with rkbeing stitched, and a presser foot cary said carrier in advance of the feed roll. Ina .sewing machine of the zigzag lock titchhig type, the combination with a rock shaft nd stitch forming mechanism, of a carrier moveed roll for intermittently moving work in timed holding the feed rollin pressure relation with the work being stitched, and a presser foot carried by said carrier in advance of the feed roll,

bly mounted on the rock "shaft and having a relation withuthe v stitch forming mechanism, means connected with the rock shaft and engaged with'the feed roll for actuating the latter, to impart intermittent motion thereto, means for said presser foot being adjustably mounted on said carrier.

5. In a sewing machine, the combination with a rock shaft and stitch forming mechanism, of a feed roll for intermittently moving work in timed relation with the stitch forming mechanism, means connected with the rock shaft and the feed roll for supporting the latter, an operating connection between the rock shaft and the 'feed roll for imparting intermittent motion to the latter, and a work supporting bed roll arranged in operative relation with the feed roll.

6. In a sewing machine, the combination with a rock shaft and stitch forming mechanism, 01' a feed roll for intermittently moving work in timed relation with the stitch forming mechanism, means connected with the rock shaft and the feed roll for supporting the latter, and an operating connection between the rock shaft and the feed roll for imparting intermittent motion to the latter, said teed roll comprising resilient material.

PETER P. GREICIUS.

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