US1244115A - Sewing-machine. - Google Patents

Description

1. M. MERROW.

SEWING MACHINE.

APPLICATION FILED APR- 6. 1916.

1 ,244,1 1 5. Patented Oct. 23, I917.

' 2 SHEETS-SHEET l.

INVENTURZ HisA'r'ru NEYs.

' J. M. MERROW.

swms MACHINE. I

APPLICATION FILED APR. 6, l9l6- INVENTURI Zfi fig/1044 His ATTORNEY Patented 001;. 23,1911? anr WW JosnPH M. MERROW, or HARTFORD, oonNEcTIcUT, ASSIGNOR TO THEMEREOW MACHINE COMPANY, or nanrronn, connncrrcur, A conronnr on or connncrrcur.

Application filed April 6,

To all whom it may concern:

Be it known that I, JOSEPH M. Mnnnow, a citizen of the United States, residing in the city of Hartford, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Sewing Machines; and I do declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the charactersof refer ence thereon.

This invention relates to sewing machines and more particularly to a type of machine adapted to produce upon the edge of fabric an ornamental finish composed of crocheted stitches. The formation of these stitches may be effected by an eye-pointed thread carrying needle, a latch hook and a chaining finger, the latter being associated with a needle plate, or work support, through which the needle reciprocates, while the latch hook, cooperative with the needle, follows a curved path extending above and below the needle plate, andmoves in a'manner to engage and concatinate or enchain' thread about the chaining finger. T he resulting chain of stitches or edging is secured to the edge of fabric at the points of needle penetration as said fabric is advanced step-by step by feed mechanism which may include the usual presser foot and reciprocating feed dog. If a fabric advancing movementof the latter is effected for each stitch forming cycle of the needle and latch hook, a plain or bar finish is produced while ifsaid advancing movement ofzthe material occurs only at intervals of several stitch forming cycles a shell finish is produced. The individual stitches are in each case practically the same, but the characteror appearance of edging produced'is quite different. Various effects in the bar finish may be obtainedby changing the'spacing of the' needle penetrations, and furthermore the bar finish and" shell finish may be combined to form"'an elaborate and attractive edging as will here- :inafter appear.

One-object of my invention is the'pro vision of devices in 1 association with "feed mechanism for. moving the; feed.- "dog into.

Specification of Letters Patent.

SEWING-MACHIN E.

Patented Oct. 23, 1917.

1916. Serial No. 89,457. 1 V

feeding relation with the work, certain of said devices being adjustable to vary the extent of advance imparted to the work by the feed dog. I I

A further object of my invention is the provision in a crochet machine, of means for controlling the feed devices, whereby the fabric to be st tched may be advanced at each stitch forming cycle or at intervals of several stitch forming cycles. I r

The accompanying drawings illustrate in a Merrow shell stitch machine one form of embodiment of the present inventiomhaving assoc ated therewith. certain co-active guide controlling devices similar to those set'forth' in apatent' application filed by me on the 2nd day "of November, 1914, Serial No. 869,936. i In the drawings: I Figure 1, is a front side view of a crochet machine. I V Fig. 2 isan enlarged viewillustrating a combination of bar and shell stitch finish. I

Fig. 3, is aplan view of feed mechanismshowing my invention included therewith and in part certain other co-active devices. A

Fig. 4, is an end elevation of the machine shown'in Fig. 3, certain parts being omitted, and others broken away for clearness, and,'- g Fig. 5. is a sectional'detail view on line 55 of Fig. 3. V v i Throughout the several views of the draw ings like characters of reference designate like parts. T p Referring particularly to the drawings the stitch forming elements comprise the needle 1, crochet hook 2. chainingfinger 3, and supplemental thread carrier 4. 'The' needleis mountedin .a bar 5, for recipro-" cation in a path extending through the needle or work plate 6 adjacent the chaining finger, and is driven'from the-main shaft 28,- through intermediate elements as eccentric 9, connecting rod..10, lever 11", linklQyand needle bar clamp 13. Thecrochet'hook' 2,

held in carrier 14. isadapted torecip rocateing finger; said carrier 14', being pivoted on";

a block 1.5, rslidably iriounted "on th'e 'innerirt face off :a frame" cap 1 6, wlierebysi rnovemeiitzr of said hook in the defined path may be imparted by a pair of intergeared grooved cam cylinders 17 and 18, which are respectively engaged by oppositely extending arms 19 and 20 of carrier lat. Cam cylinder 17 rotates with the main shaft 8 of the machine, to which it is secured, andthrough gears 22 and 23, effects simultaneous rotation of cam cylinder 18, which is mounted on shaft 2a.

The supplemental thread carrier l, is secured in a rock shaft 25, suitably mounted on the machine frame and provided with an arm 26, adapted to engage a cam 27, ro-

tative with cam cylinder 18. Arm 26, is yieldahly held against cam 2?, by a spring as 28, coiled about the rock shaft 25, whereby rotation of said cam effects an oscillatory movement of carrier 4:, which causes the free end of said carrier to move across the path of the needle. This supplemental thread carrier is not essential to ef ect the formation of stitches but is preferably employed to introduce into the stitches an additional thread to enhance tl e beauty of finish and produce a more substantial edge.

A fabric edge guide as 30, is adjustably attached to a slide 31, carried by the frame cap, the latter also carrying a slide 32, for a purpose that will hereinafter appear. Fulcrumed on. a pivot 33, intermediate side 31 and 32, is a lever 34s, slotted at 35, to adjustably receive one end of a link 36, said link being articulated at its other end to slide 31. Upposite ends of lever 34, are provided respectively with a slot 37, to engage pin on slide 82, and a manipulating knob 89. Inasmuch as slides 31 and 32. are connected to lever 34-, on opposite sites of the fulcrum for the latter it will be readily understood that shifting o1 manipulating knob 39, in either direction will cause the slides to move respectively in opposite directions. 1 his slide mechanism together with certain associated parts has been more fully described and claimed in the above mentioned application Serial No. 869,936.

Work engaging feed elements comprise the usual presser foot a l, and feed dog To permit of the required reciprocation of the feed dog it is associated with a slide 46,, and in order that movement of the feed dog with respect to the work may be rendered effective or ineffective to advance the work, the slide is mounted in a shiftable member such as a guide bar 47, fulcruined at one end on a stud 48'. 'Obviously the position of guide bar 47. determines the position of the feed dog with respect to the work plate 6, and therefore, the relation of the feed dog, to work supported by. the work plate. Slide 46. which is fitted in a groove 50', of the guide bar, and laterally supported by a.

contiguous wall'bl, of the machine frame, is free. to be reciprocated longitudinally of:

the guide bar by mechanism indicated in a general v iy by 52. This mechanism includes rock lever 53, connected by a link. 5%, with an eccentric 55, on the main shaft 8. At one end rock lever 53, is fulcrumed on a short shaft 56, and a its other end it is provided with a slot 57, adapted to receive a pin 58, rigid with slide L6, and projecting through a slot 59, in guide bar lntermediateits ends, rock lever 53, is provit ed with an elongated slot 60, wherein a stud 61, connecting said-lever and link 54:, may be adjusted to vary the amount of throw imparted to the rock lever, thus regulating' the reciprocatory movementof slide 46, and the feed dog 45, relative to the guide bar. From the foregoing description it will be apparent that when the machine is in opera ion the feed dog is continuously reciprocated. In other words a complete reciprocation of the feed dog occurs for each cycle of the stitch forming elements. The feed dog, however, is effective for advancing the work only when the guide bar 47, is shifted to the po sition in which it is shown in Fig. 4, during intervals when said feed. dog is moving in the direction of arrow A. hen the guide bar 447, is thus shifted for each stitch forming cycle, the work is correspondingly advanced step by step and the nest is makes a separate penetration for each stitch, the sulting finish being plain crochet, or bar stitch as shown at 6%, (see Fig. 2). If, however, the shifting of the guide bar is effects: only at intervals of several stitch forming cycles, no advan es of the work will be effected except at tie end of such intervals, and consequently a corresponding number of stitches will be secured at practically one needle penetration and the finisn produccl will be composed of clusters or shells as shown 65, (See Fig.

Mechanism for shifting the guide bar a7, is indicated in a general way by 66. It includes a gear 68, mounted on a stud 69, and

' meshing with a pinion 70, at the extreme end of main shaft 8. Associated with gear 68, are the cams 71 and 72. Cam 71, is fitted on the hub 73, of gear 68, and is adapted to be secured firmly, but adjustably against the inner face of said gear by screw 74:, and

indirectly by screw 75, as will appear. Cam 72, is fitted to a slightly. reduced. portion of gear hub 73', adjacent to cam 71, and is secured by screw 75, the latter being countersunk in the gear, extended through an arcuate slot 7 6, in cam 71, and threaded into cam 72. The screw 75, maintains cam 72, in fixed relation to gear 68, and also serves to secure cam 72. in clamping relation against cam 1'1. Gear 68, is provided with an areuate. slot 77, countersunk to receive the head ofscrew 7 L, which screw, as beforev intimated is threaded into cam 7Z1. By virtue of'thev slotmentioned, for moving the feed'dog, through the agency of intermediate parts, toward and from the work. The surface 85, is inclined with respect to element 86., and guide bar 47, so that adjustment of the shoe along the guide bar will vary theposition of the feed dog carried by the guide bar in respect to the work.

Interposed between cam 72, and guide barl7, Fig. 3) ish lever 87, supported at one end for rocking movement on a fulcrum stud 88, along. which the lever is also longitudinally movable for a purpose that will hereinafter appear. At its free end lever 87, is transversely bored to receive the supporting element or pin 86, which is held in place by a set screw 89. A head 90, with which pin 86, is provided on one side of lever 87, is formed with a slot 91, therein, so that when lever 87, occupies the position in which it is shown in the drawings the head 90, will be engaged only by cam 71, because of the fact that the clearance slot 91, during this particular relation of parts involved, is in register with the path of the other cam 72. iVhen, however, the lever 87, is shifted from the position in which it is shown in the drawings (to the right as seen in Fig. 5) the cam engaging part of head 90, is moved from the path of cam 71, and into the path of cam 72. It will be clear that both cams 71 and 72, are adapted to impart an oscillatory movement to lever 87, and inasmuch as the shank of pin '86, extends at all times into engagement with shoe 81, it will also be clear that the oscillatory movement mentioned will be imparted to guide bar 17. To insure against failure of shoe 81, to firmly engage pin 86, there is provided a spring 92, housed in a bore of the machine frame and adapted to exert suitable pressure against that side of the guide bar which is opposite to said pin 86. To prevent excessive movement of lever 87, when cam 72, passes the cam engaging part of head 90, there is provided a stop 93, to engage the opposite end. of pin 86.

In the present case the gear 68, has eight times as many teeth as pinion. 70. As said pinion is on the main shaft 8, which makes one revolution to each stitch forming cycle, it follows that eight stitches will be formed during eight revolutions of the pinion or one revolution of the gear. Cam 71, having eightpomts or rises, and cam 72, with the one rise, rotate with the gear and therefore their respective eflect on the feed mechanism thus shifted it is connected to slide 32, by a bar 9 l,which is provided with a'yoke 95, to engage the hub of lever 87, in a manner to permit rocking movement of said lever. The slide 32, has already been described as simultaneously operable with the slide v31, which controls edge guide 30. This arrangement insures a suitable adjustment of'the edge guide, which requires a different setting for the two styles of finish produced respectively by cam 71, and cam 72, as shown in Fig. 2. That is the plain finish 64, is preferably secured dee er into the margin of the work than the shell finish 65. It will be understood that proper shifting of the edge guide is effected simultaneously with 'adjustment to give the desired style of stitch, by simply manipulating lever 34.

Referring to. Fig. 4, variations in the work advancing effect .of the feed dog as regulated. by'certain adjustments of the feed controlling mechanism will now be described. The feed dog is suitably effective for advancing the work only when its teeth are more or less above the work supporting surface and moving in the direction of arrow A. /Vhen said feed dog is maintained in this effective position throughout its advancing stroke, the maximum feed occurs. feed is suitable for producing the shell finish and is effected through agency of cam '72, which it will be noted is formed with a relatively long dwell at the extreme of its throw. The rises in cam 71,7are very much more restricted and therefore maintain the feed do in effective position only during a part 0 its advancing stroke thereby giving a lesser degree of feed which is suitable for the plain stitch. This feed for plain stitching, is, in itself preferably variable to produce different lengths of stitch and such variations I make provision for in a manner, involving the adjustment of cam 71, relative to gear 68. By virtue of the fact that the feed dog derives its work advancing movement from an eccentric, such movement is of variable velocity, that is it is moving faster at the middle of its stroke than at the beginning and end thereof. Therefore if said feed dog is held in effective feeding relation to the work at the middle of its stroke for a given period it will advance the work farther than when it is held in effective feeding relation with the work for a. like period to Such a' ward either end of its stroke. It will be apparent then, that if cam 71, when in the relation to gear 68, in which it is shown in Fig. 4, is effective to move the feed dog into feeding relation with the work when said feed dog is at the middle of its stroke, a comparatively long stitch will be formed, while if said cam is adjusted around to the right as seen in Fig. it will be effective to move the feed dog into feeding relation with the work, when said feed dog is at or toward one end of its stroke, and the resulting stitch will be correspondingly short. Within the range of adjustment provided for cam 71. any feed of the work, which is suit able for the class of stitching involved, may be produced.

Having thus described my invention, what I claim is,

1. in a sewing machine, a feed dog, a shiftable support for the feed dog, means including a rotary shaft for reciprocating the feed dog with respect to its support, a pinion on the shaft, a gear meshing with the pinion, a. pair of cams of different contour secured to the gear, and a device contiguous to the feed dog support provided with a cam engaging portion shiftable wholly into the path of either of said cams, whereby the feed dog may be moved into work engaging relation through different lengths of its reciprocatory movement.

2. In a sewing machine, a feed dog, means for reciprocating the feed dog, mechanism including cams of different contour for moving the feed dog into work engaging relation, and a device associated with the feed dog provided with a cam engaging portion shiftable wholly into the respective path of any one of said cams.

3. In a sewing machine, a feed dog, mechanism including a rotary shaft for reciprocating the feed dog, a pinion on the shaft, a

gear meshing with the pinion, a pair of cams secured to the ear and adapted respectively to move the feed dog into work engaging relation through different lengths of the reciprocatory movement of the feed dog and a device for transferring motion. from the cams to the feed dog, said device being adapted when moved into the path of either of said cams to clear the path of the other cam.

4. In a sewing machine, a feed dog, a shiftable support for the feed dog, means for reciprocating the feed dog with respect to its support, a plurality of cams each operable to reciprocate the feed dog support in a different relation to reciprocatory movement of the feed dog, a movable device extending between the feed dog support and the cams and a pin carried by said device, said pin on one side of the device being in constant engagementwith the feed dog support and on the other side of the device having a head recessed to form a cam engaging portion which for different positions of the device is adapted to lie wholly within the path of a respective cam.

5. In a sewing machine, a feed dog, means including a gear and a pair of cams for differently actuating the feed dog and means for securing the cams to the gear comprising a screw extending through three of the elements to be secured and a screw extending through two of said elements, the intermediate element being slotted to permit lateral movement of one of the screws and one of the other elements being slotted to permit lateral movement of the other screw whereby relative adjustment of the cams may be effected.

. JOSEPH M. MERROW. Witnesses:

F. N. SPELLMAN, F. E. ANDERSON.

Copies or this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

' Washington, I). 0.

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