US637744A - Take-up for sewing-machines. - Google Patents

Description

No. 637,744. 4 Patented Nov. 2|, I899. Wv M. AMMERMAN.

TAKE-UP FOR SEWING MACHINES.

(Application filed Mar. 28, 1897.) I

(No Model.) 3 Sheets-Sheet I.

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(Application filedMar. 26, 1 897.)

3 SheetsSheet 2.

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No. 637,744. Patented Nov. '21, I899.

W. M. AMMERMAN.

TAKE-UP FOR SEWING MACHINES.

(Application filed Mar. 26, 1897.) (No Mod el.) 3 Sheets-Sheet 3.

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' UNITED "STATE-s PATENT CFFICE.

EDWIN J. TOOF,

OF SAME PLACE.

TAKE-UP FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 637,744, dated November 21, 1899.

Application filed March 26, 1897. Serial No. 629,331. (No model.)

To all whom it may concern.-

Be it known that I,WILLIAM M. AMMER- MAN, a citizen of the United States, and a resident of the city and county of New Haven, State of Connecticut, have invented new and useful Improvements in Take-Up and Thread- Controlling Mechanism for Sewing-Machine's, of which the following description, taken in connection with the drawings herewith accompanying, is a specification.

This invention relates particularly to a take-up and th read-controlling mechanism for sewing-machines and it consists, first, in the combination,with the vertically-reciprocating needle-bar of the machine, of a vertically-reciprocating take-up device confined to movement in a path parallel with the path of movement of the needle-bar and means for actuating the needle-bar and take-up whereby the latter is caused to move at a less speed than the needlebar when giving down the thread and caused to move upward in the same time therewith, said means including a rotary shaft carrying a crank-pin for engaging with said needle-bar and take-u p device; secondly, the invention further consists in the combination, with the needle-bar provided with a cam-groove, of a take-up device consisting of a frame'supported to slide upon the needlebar and provided with a cam-slot therein and an antifriction-roll having means whereby it is permanently connected with the needle-bar and take-up device within the said cam-groove and cam-slot with which such parts are provided and holding the parts vertically in position relative to each other when disengaged from their operating means; thirdly, the invention further consists in the combination, with the needle-bar and take-up actuated in the manner described, of a horizontally-reciprocating looper having means for controlling the slack thread given down by the take-up during the descent of the needle, and, fourthly, the invention further consists in various other details of construction and combination of parts, as hereinafter set forth in detail, and pointed out in the claims.

Referring to the drawings, Figure 1 represents a rear view of the sewing-machine faceplate removed from its position upon the arm of the machine, also showing the needle-bar with my improved take-up device connected therewith; Fig. 2, a Vertical section through a portion of the arm of the machine, at the take-up device, and the front end of the upper rotating driving-shaft with its crank-disk for operating the said needle-bar and take-up device; Figs. 3, 4, 5, 6, and 7, a front end elevation of the sewing-machine arm with its supported needle-bar, presser-bar, and takeup device, also a looper and its carrier, showing in full and dotted lines the relative positions of the needle-bar and take: up with their connected operating parts and the looper at different times during the formation of a stitch; Fig. 8, a plan view of the front end of the bed-plate of the machine with the slide-plates removed and a portion of the bedplate broken away, showing the looper and its carrier; and Figs. 9 and 10, detail views to be hereinafter referred to.

To explain in detail, the bed-plate a, the throat-plate a, the arm a the presser-bar a and the needle-bar a are all of usual form and construction, as found in the ordinary sewing-machine. The needle-bar a is provided with a plate a secured thereon, having a cam-groove a into which latter a crankpin b, carried by the disk I) on the end of the upper rotating driving-shaft 12 extends and front end thereof, showing the needle-bar,

operates to give the said needle-bar its vertical movement.

According to my present invention, as before stated, I have supported the take-up device (represented at c) to slide upon the needle-bar and receive its movement in common with thelatter from the said operatingcrankpin 1). This take-up device, as more clearly shown in Figs. 1 and 2, consists of a plate a, which is provided with side flanges c 0 adapted forclosely em bracing the sides of the needle-bar, as shown, and having one end thereof projecting outwardly through a vertically-elongated slot 0 in the face-plate of the machine, which projecting end is provided with an eye a therein to receive the neodle-thread, which is adapted to pass through the same in its passage from the spool or thread-supply to the needle in the usual manner. A second plate or frame 61 is rigidlysecured to the opposite sides of the plate 0 in a position at the rear of the needle-bar by suitable fasteuing screws or rivets d, as shown. The plates 0' and 01 being thus connected act as though formed in one integral piece, and,

closelyembracing' the four" sides of the nee dle-bar at their point of connection, are supwill be held in a ported and guided thereon. The said plate 01 extends in a position behind the grooved plate a on the needle-bar and between the same and the disk I) on the driving-shaft and is provided with'a cam .slot or opening d? therein, through which the crank-pin b is passed when entered into the groove in the plate a on the needle-bar, as shown in Fig; 2, whereby the take-up-device will be oper ated in combination with the needle-bar in a manner as will hereinafter be set forth in detail. The plate 0?, above the said'cam-slot therein, is provided with a vertically-elongated opening d therein, which receives the end of a fixed pin (1 located upon the needle-bar. This pin 61 serves as a partialsupport and guide for the take-up device as a whole and holds the plate d thereof fromlateral movement relative to the needle bar when being operated. It will be understood that this said fixed pin d extending into the opening 61 in the plate 6?, as described, will retain the take-up device in vertical position upon the needle-bar; but in order to support the same so thatits cam-slot d will always be in proper operative position relative to the groove a in the needle-bar plate to receive the crank-pin b therethrough whenit is entered into the said groove I have provided an antifriction-roll 0, into which the crankpin is adapted to be fitted, of sufficient width for extending into both the cam-slot d and cam-groove a, whereby the take-up device position with some portion of its slot d opposite the groove a, as shown in Fig. 1. The take-up cam and the needle bar cam are also held in such described position relative to each other by means of the fixed pin d on the needle-bar extending into the opening 01 of the take-up, as will be obvious upon reference to Fig. 1. The takeup being supported and operated in connection with the needle-bar, as described, receives the same length of throw or movement as the needle-bar, thus reducing to a minimum the amount of slack thread produced. The take-up slot 01 is made narrower than the needle-bar groove a and the roll e is formed with a portion of its periphery or less circumference than the other to accommodate itself to the different widths of the slot and groove, as 'clearlyshown in Fig. 1. 'In this manner the roll is locked in connection withthe needle-bar and take-up device and enables the latter to be located and adjusted in proper operative position upon the needlebar before the latter is placed in connection "with the machine, so that when the needlebar is placed in position and the crank-pin b I entered into its groove Within the roll e the take-up is thereby also placed in operative connection with the machine. The take-up device being thus supported wholly upon the needle-bar between the bearings of the latter and independent of permanent connection,

clearly shown in Fig. 8.

the advantage of which will be obvious.

The take-up device is timed to operate, in

combination with the needle-bar and needle, so that in drawing up the stitch 'it will move upward with the needle in the same time therewith; butin moving downward from the position shown in Fig. 4 the take-up only moves about one-half as fast as the needlebar, so as to give down a correspondingly-less amount of thread than would be given down by the needle-bar in case the latter was used as the take-up. In this manner the amount of slack thread to be controlled bythe usual spring-controller f is greatly reduced, whereby less strain beingupon the same it is better enabled to control the thread when the machine is run at a'h'igh rate of speed, and

it also enables such spring-controller to be entirely dispensed with when a looper is employed in lieu of the shuttle in a manner as will hereinafter be referred to. The relative movements of the needle-bar and take-up, as described, are secured by-forming the cam-slot in the take-up and the cam-groove in the needle-bar plate parallel with each other at one side of the needle-bar, in which parallel portions the crank-pin operates in giving the parts their upward movement and forming the same at different angles to each other at the opposite side of the needle-bar, in which latter portions the crank-pin operates in giving the diflerential movement to the parts when being moved downward. The position taken by the two cams and the operating crank-pin therein at dilterent times during the upward-and-downward movement of the needle-bar and take-up are clearly shown by dotted lines in Figs. 3, 4, 5, 6, and '7. As another feature of my present invention I have provided a looper for chainrstitch sew ing having means for coacting with the said needle-bar and take-up device, as described in controlling the slack thread. This looper (represented at h) is adapted to be used interchangeably with the ordinary shuttle and be seated and secured within the horizontallyvibrating shuttle-carrie'rt' in a manner as more The said looper h consists of a supportin -shank h for connection with the carrier 1', provided with a looperarm 71, arranged substantially parallel with the wall of the raceway, which arm is provided with a loop-engaging hookh at one end thereof. I As the thread-loop n is thrown out by the needle, as shown in Fig. 3, at which time the take-up is also at about its lowest point, the said hook it of the looper is then advanced in the direction indicated by the arrow to be entered into the said loop. The looper then continues to advance in the same direction until the loop n has reached the crotch between the hook and the arm, at which time it is carried onto the arm 71 as shown in Fig. 4, by reason of a short upward bend h being formed at the point of union between the parts, which serves to guide the loop from the hook to the said arm, as will be obvious. The looper now begins its return movement, and when it has reached the position, as shown in Fig. 4, with its crotch in line below the path of the needle the take-up has reached its highest point, as shown. Now, as the looper continues in its said return movement and the take-up begins to descend, in order to control such slack thread as is given down by the take-up to keep the same away from the point of the needle until the latter has entered the goods I have provided the looperarm h with an inclined surface 71, extending downwardly from the end thereof, and with a lateral swell h as more clearly shown in Fig. 10, which act upon the loop at such time to draw the thread down below the clothplate and prevent the forming of any slack thread until the point of the needle has reached the goods, as shown in Fig. 5. In this manner the usual spring or other device for I controlling the slack thread maybe dispensed with. After the slack thread given down by the take-up device has been thus controlled by the peculiar formation of the looper and the needle has entered the. goods the looper then continues in its said return movement from the position shown in Fig. 5 to that shown in Fig. 6, in which latter position the loop has reached the rear end of the looperarm and the needlehas reached its first dip, so called, to throw out another loop 02, at which time the shuttle (shown in dotted lines) would, if used, enter the same. From the position shown in Fig. 6 thelooper now moves forward to enter its hook it into the loop 01. as it is thrown out at the second dip of the needle and cast off the first loop n, as shown in Fig. 7. The said loop at, as it is thus cast off the looper, encircles the loop 71., just engaged by the latter, and is drawn up by the take-up to form a chain-stitch in the usual manner, as well understood by those skilled in the art.

Having thus set forth my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is

1. In a sewing-machine, the combination, with a vertically-reciprocatin g needle-bar pro-" vided with a cam-groove, and a driving-shaft carrying a crank-pin which operates within said cam-groove, of a take-up device, consisting of a frame provided with a thread-engaging arm and having a part thereof extending adjacent to said cam-groove to pre-' sent a surface for the engagement of said crank-pin, means, independent of said crankpin, movably connecting the take-up device with the needle-bar to permit the same to angle relative to the cam-groove whereby the descent of the take-up is rendered slower than that of the needle-bar.

2. In a sewing-machine, the combination, of a vertically-reci procatin g needle-bar, a vertically-reciprocating take-up device confined.

to movement in a path parallel with the path of movement of the needle-bar, and means for actuating said needle-bar and take-up whereby the latter is caused to move at a less speed than the needle-bar when giving down the thread and caused to move upward in the same time therewith, said means including a rotary shaft carrying a crank-pin for engaging with said needle-bar and take-up device.

3. In a sewing-machine, the combination, with the needle-bar provided with a camgroove, of a take-up device, consisting of a frame supported to slide upon the needle-bar and provided with a cam-slot therein, an antifriction-roll having means whereby it is permanently connected with the needle-bar and take-up device within the said cam-groove and cam-slot with which such parts are .pro-

vided and holding the parts vertically in position relative to each other when disengaged from their operating means, and means foroperating the take-up and needle-bar.

' 4. In a sewing-machine, the combination, with the needle-bar provided with a camgroove, of a take-up device, consisting of a frame supported to slide upon the needle-bar and provided with a cam-slot therein, the latter being of less width than the cam-groove of the needle-bar, an antifriction-roll sup ICC ported within both the said cam-groove and cam-slot to support the take-up in vertical position upon the needle-bar and having a portion of its periphery of less circumference than the other to accommodate itself to the difference in width of the cam-groove and cam-slot and be retained from displacement within the same, and an operating-crank having a pin thereon extending into an opening withinsaid autifriction-roll, for the purpose set forth.

5. In a sewing-machine, the combination, with a vertically-reciprocating needle-bar, a vertically-reciprocating take-up, device confined to movement in a path parallel with the path of movement of the needle-bar, and means for actuating said needle-bar and takeup whereby the latter is caused to move at a less speed than the needle-bar when giving down the thread and caused to move upward in the same time therewith, said means including a rotary shaft carrying a crank-pin for engaging with the needle-bar and takeup, of a horizontally-reciprocatin g looper having means. for controlling the slack thread given down by the take-up during the del Vitnesses:

CHAS. F. DANE, B. E. SWAINE.

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