US2397336A - Looper throwout mechanism - Google Patents

Description

March 1946- 'A. B. CLAYTON LOOPER THROW-OUT MECHANISM Filed Jan. 1, 1945 2 Sheets-Shee,t 1

Mod/M ndrea) 5. 670595011,

March-26, 1946 A. B. CLAYTON LOOPER THROW-OUT MECHANISM Filed Jan. 1, 1945 2 Sheets-Sheet 2 v gwumbom L/Zz/zdreu) 13074336070 Patented Mar. 26, 1946 UNITED STATES PATENT orric'e LOOPER .THROWOUEI MECHANISM Andrew B. "Clayton, Elizabeth, N. J., 'assignor to The "Singer Manufacturing 'Company, Elizabe'th, N. .L, a corporation of New Jersey Application January 1, 1945, Serial "No. 570,925

13 Claims. (mug-200) This invention relates to chain stitch sewing machines and more vparticularly .to .a control for the thread-carrying looper mechanism of such machines. 7

The primary object of the invention is to provide an improved looper throw-out .for retracting the looper from a normal, operating position adjacent the needle to a more convenient threading position, the mechanism being arranged for ready manipulation by the operator and without interference with the normal use of the machine.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth andillustrated in the accompanying drawings =01 a preferred embodiment of the invention, from which the several features of the invention and the advantages iattained thereby will be readily understood by those skilled in the art. 1

In the accompanying drawings:

Fig. 1 is a vertical, longitudinal section of a portion of a sewing machine embodying the invention;

Fig.2 is a cross-section approximately on the line 2-2 of Fig. 1;

Fig. 3 is a front elevational view showing the control handle and associated parts in different positions of adjustment;

Fig. 4 is a vertical section on the line 4-4 of Fig. 2;

Figs.'5 and 6 are detail views of' parts of the mechanism;

. Fig. '7 is a vertical section on the line l-'I of Fi 1;

Fig. 8 is a horizontal section on the .line 8 8 of Fig. 2; and

Fig. 9 is a cross-section on the line 9-9 of Fig. 8.

For purposes of illustration the invention is applied to a sewing machine of the general construction disclosed in United States Patent No. 2,345,327, Mar. 28, 1944, onl so much of the machine being shown and described herein as is necessary to an understanding .of the invention.

The machine comprises abed or work-support, ing plate, generally designated I, set into a table top 2. Immediately below the bed I and suitably supported from the table is a stationary base or housing 3 which encloses the under bed mechan sm below described. At its rear (see Fig. 2) the machine bed I is connected to the table by hinge. elements 4, 5, so that the bed can be bodily raised to expose and afiord ready access tothe mechanism mounted on the underside of the bed.

Ingenerai, such mechanism comprises a rotary drive-"shaft 6 incorporating a crank 1 and ran eccentric 8 by which, respectively, the requisite endw'ise reciprocating and-sidewise or laterally vibrating movements are imparted to a 'looper 9 mounted on a looper-carrier ill, The endwise recipro'catory movements of 'thelooper are efiected through the medium of a p'itman ll, rocker arms I! and i3 journaled ona stud 11, and a'link i5 connecting rocker arm it'with the loopercarrier to. The :sidewise "or laterally vibrating movements of the looperare effected through the medium of an eccentricsactuated fork i6 and rock-shaft 11, the latter jomnal'ed in bushings i8, 1:9 fitted withina bearing support 28 forming part or the bracket 21 depending from the under side ofthe bed I. "I'herock-shaft 11 :in-turn supports the looper carrier in theimanner to be described.

On the end of the rock-shaft .l I remote from the fork this a tubular cross-head 22 (Figs. 4, 5 and 7:) and journaled in the cross-head is a rocker member 23' having an eccentric bore 24 and a depending arm 25. As shown in detail in Fig. 4, the rocker member 23 is normally held against rotation relatively to the cross-head 22 by the engagement with a shallow V-shaped notch 21 .in onesside of the rocker member, of

the complementary end of a spring-pressed plunger 28 mounted in a tubular, cross-head extension 29. I

Journaled in the eccentric bore 24 of rocker member 23 is a stud -30 to which is clamped, as by screw 3|, the lower end of .looper-carrier ill. As will be understood, the axis of stud 30 constitutes the pivot axis about. which the loopercarrier is oscillated by link IS .in the reciprocation of the looper 9., that is, toward and from the needle 32 (Fig. 1); and the axis of rock-shaft 11 represents the axis about which the 'looper-carrler and loope'r are bodily vibrated laterally with resoect to the vertical, reciprocatory movements of the needle. The iulllineposition oi. the 'looper indicated in Fig. 1 represents the limit of its normal movement in a direction away from the needle, or to the right "as viewed in that figure. As will be recognizedfthe foregoing method of mounting the iooper-ca'rrier stud 3'0 ec'centrically in the rocker member 23 provides a ready means for throwing the looper into the dotted line position "shown in Fig. '1 in which it is conveniently accessible ior'threading'upon removal of the plate 33, such movement of the looper and its carrier and stud requiring only the rotation oi the rocker member 2 3 from its Fig. i-or'F'lg. 1 full-line position, into its Fig. 1 dotted line position. The rocker member 23 is limited in its angular movements by the surfaces 23 and 23 thereof conably mounted a control rod 38. To the inner end of control rod 38, within the base 3, is secured a curved crank arm 39 having jaws 40 aligned with arm 25 by a pin 4| projecting from control rod 38 and located in a slot 42 in the sleeve 31. Secured to the other end of the control rod 38, outside the front wall of base 3 and conveniently located beneaththe table 2, 'is a control handle 43 which is counterbored to receive a spring 44 by which the, control .rod is.normall held in its outermost position (Fig. 8, and full-line position of Fig. 2). The inner end of sleeve 31 is provided with a recess 45 forming a lateral extension of slot 42. the recess being bounded by end-wall 46 -(Fig. 9). r J

Thus, in the normal condition and use of the machine. the just-described looper throw-out control means'is entirely free ofany connection with the looper mechanism itself. including arm 25, with the result that the machine bed can be freely raised for inspection or repair of the under-bed mechanism without requiring the disconnection or disassembly'of any 'part of such control means. However, when it is required to throw the looper. toits threading. position (the dotted line position'of Fig. 1) the control handle 43 is merely thrust inwardly, guided by the movement of pin 4| in-slot 42 and causing the jaws to straddle arm 25, and is then rotated from the full line to the dotted line position of the handle as shown in Fig. 3,'thereby disengaging plunger 28 from notch 2'! and rotating rocker member'23 as above-described. During rotation oi the control rod 38 the pin 4| rides in the recess 45,the' end wall 46 of the recess serving as a limit stop for the pin and forthe rotation of thecon'trolf rod. Reverse rotation of the control rod 38 byhandle 43; restores the looper and its carrier to their normal positions, and when the handle is released the spring 44 moves the control'rod outwardly to its original position, thereby automatically disengagingfthe jaws 4B of crank arm 39 from arm 25. v 7 Having thusset forth the nature of the invention, what I claim herein is: .1. In a sewing machine having a bed, a loopercarrier. and actuating .mechanismtherefor lo- 7 cated beneath the bed and carried thereby the looper-carrier being bodily adjustable relatively to the bed, and a base supporting said bed for movement relative to the. base. said base enclosing such .mechanism,. the combination. therewith self bodily movable into and out of operative position.

3. In a sewing machine the combination of a looper-carrier, an'adjustable support therefor,

and manually operable support-adjusting means movable into and out of engagement with the support.

4. In a sewing machine the combination of a looper-carrier, an adjustable support therefor.

support-adjusting means normally disengaged from the support, and manually operable means for engaging the support-adjustin means with the said support.

5. In a sewing machine having a bed and a base, said bed being removably supported on said base, and, supported from the bed within the base, a looper, a looper-carrier, an. adjustable support therefor, and actuating means 'for the looper, the combination therewith of manually operable support-adjusting means mounted on the base. v

6. In a sewing machine having a bed and a base, said bed being removably supported on said base, and, supported from the bed within the base, a looper, a looper-carrier, an adjustable support therefor, and actuating means for the looper, the combination therewith of manually operable support-adjusting means mounted on the base and movable into and out of engagement with the adjustable support.

'7. In a sewing machine having a bed and a base, and, supported from the bed within the base, alooper, a looper-carrier, an adjustable support therefor, and actuating means for the looper, the combination therewith of supportadjusting means mounted on the base and normally disengaged from the support, and manually operable means movable to engage the support-adjusting means with the support.

8. In a sewing machine having a bed and a base, said bed being removably supported on said base, and, supported from the bed within the base; a looper, a looper-carrier and a support therefor rotatable to adjust the position of the carrier and looper relatively to the bed, the combination therewith of a manually operable support-rotating member mounted on the base.

9. In a sewing machine having abed and a base, and, supported from the bed within the base, and, supported from the bed within the base, a looper, a looper-carrier and a support therefor rotatable to adjust the position of the carrier and looper relatively to the bed, the combination therewith of a rotatable control membermounted on the base with freedom for bodily movement into and out ofengagement with said support and spring means normally maintaining said control member out of engagement with a the support. 1

11. In a mechanism of the character described, the combination with a tubular housing of a member mounted in the housing with freedom for rotary adjustment relatively thereto and having an eccentric bore, a stud mounted in aid bore, and a looper-carrier mounted on the stud. I

- 12. In a mechanism of thecharacter described,

the combination with a tubular housing of a member mounted in the housing with freedom for rotary adjustment relatively thereto and having an eccentric bore, a stud mounted in said bore, a looper-carrier secured to the stud, means for oscillating the looper-carrier about the axis of the stud, means for transversely oscillating the said housing, and manually operable means for rotating the said number.

13. In a mechanism of the character described,

ANDREW B. CLAYTON.

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