US1555187A - Sewing machine - Google Patents

Description

ATTORNEY.

Sept. 29%

J.-cooK. SR.. ET AL.

SEWING lMACIIINE Filed Oct. 25 1924 Cil Patented Sept. 29, 1925.

UNITED STATES PATENT OFFICE.l

.iAMEs'coOK,sR., JAMES COOK, JR.`ANDl JOHN COOK, or LONDON, ENGLAND.

SEWING MAKCHIN E.

Application filed Octoberv 25, 1924. Serial No. 745,850.

- and a consequent increase of speed are Obtained.

According to this invention, the main or lower shaft is provided with two cams or eccentrics, one for lifting and the other for traversing the feed-dog, the lifting cam being adapted to engage and rotate in an eccentric strap which is furnished with a slide or block adapted to move vertically in a fixed guide or distance piece, the said bloc-k being also furnished with a stud or pivot,

while the other cam', which is for traversing the feed-dog is rotatable in a hole in a slide vertically movable in a guide in the feed carrier or fork which is pivotally mounted'at vits, lower end and rocks on the stud orpivot. The'main shaft is preferably mounted on ball bearings and the crank andconnect-ing rod or link for driving the rocking shaft for the needle-bar are also similarly provided.

And in order that the invention may be readily carried into effect reference will be made to the accompanying drawings illustrating oneembodiment of a sewing machine constructed according to this invention, and in which Figure l is a part sectional elevation of the machine.

Figure 2 is an end elevation of the main shaft and connected parts.

Figure 3 is a section on the line III-III, Figure 1, and

Figure 4 is a sec-tion on the line IV--IV, Figure 1.

In carrying the invention into effect according to the construction illustrated and which is particularly suitable for machining hats, usually called a cylinder-arm chainstitch machine, the bed a is o-f hollow and approximately semi-cylindrical cross section open at the bottom and furnished at each end with ball-bearings b and e respectively for the main shaft d. The connecting rod e between the crank on the said shaft Z and the arm or lever on the rocking shaftv g mounted in the arm Z1. of the machine, is also similarly provided at each end with a ball bearing or as shown there may be a ball bearing surrounding the crank-pin Z; only.

Near lthe left hand end of the main shaft Z furnished-with the hook and looper (not shown) thesaid shaft is furnished with two cams or eccentrics marked Z and m, respectively, and set at an angle to each other and, with a space between to accommodate a `fixed plate or kdistance-piece n which is mounted within the flangesv of a covergofixed to the distance piece n by screws 79' (Figure 2). The cam m is for raising and lowering the feed-dog and the cam Z oper-,

ates to lcause the feed dog to reciprocate transversely. The fixed plate n is secured in' place by screws (l engaging in another plate 2 to be presently described. The said plate n has a guide constituted by a vertical oblong slot r having parallel sides, the slot being adapted to receive a small block or slide s integral with or, as shown, pivoted to aV hollow stud zii furnished withV a head or shoulder at its outer end and mounted so as to project on oney side of the lower end of the rod u of an eccentric strap or feed lifting bar consisting of a more or less oblong piece ofv metal having a round hole near the top to engage the liftingeccentric or cam mi. The hollow stud t on which the block or slijde s is mounted, is Xed to the feed vlifting bart! by a grub screw o and is, furthermore, adaptedto constitute the pivot of a fork-shaped feed-carrier w. This feed- 4 carrier is furnished at the top with a slot having parallel sides and a small slide y of rectangular shape is adapted to slide freely in the guide or'fork so formed. This small slide y is also provided with a round hole adapted to fit easily on the eccentric or cam Z for traversing the feed-dog. The effect of the two rotating cams m and Z will be to cause the feed dog, which is fixed to the top of one of the fork members or prongs of the feed-carrier w, to rise and descend and at the same time to move transversely` to feed the work over the needle plate a. A steel plate 2 previously referred to, serves to take up any wear of the feed lifting bar u which may be caused by the thrust from the feed-carrier w, and the plate is conveniently secured to the end of the bed a of the machine by, say, three screws 3, of which one is shown in Figure 1 and the other tWo in Figure 4. If desired, the cap 0 is furnished with a low Wall 4 to form a sump for oil, the feed-lifting bar is provided Wit-h a hole 5 indicated in dotted lines in Figure 4 and containing a piece of Wick to lubricate the stud t and the canim. Similarly, the feed-carrier is provided With a hole 6, shown in dotted lines iu Figure`2 and also containing a piece of wick for lubricating the. slide y. If desired, one side or both sides of the cap o may be provided with a small hinged door (not shown) to give access to the interior for the removal of fluff or other foreign bodies Wit-hout necessitating the removal of the cap and so possibly ldisplacing the wicks from` the sump.

I claim z- 1. In a sewing machine, the combination With a shaft, a cam mounted on the latter for imparting vertical movement, and a second cam mounted on the shaft for imparting traversing` movement to the device for feeding the material to be sewn, of a feed lifting bar mounted on the first cam, a stud on the said feed lifting bar, a fixed vertical guide in which the stud is adapted to reciprocate vertically, a feed carrier pivotally mounted on the said stud, and a guide on lthe' saidffeed carrier rWithin which the second camis rotatable to cause the feed carrier to oscillate.

2. In a sewing machine, the combination with a shaft, a cam for imparting vertical movement and a second cam for imparting traversing' movement mounted on the said shaft of a feed lifting bar, co-ac'ting with the lifting cam, a stud on the said feed lifting' bar, a. slide freely mounted on the said stud, a fixed guide in Which the said slide isadapted to reciprocate vertically, a

' feed-carrier pivotally mounted on the stud on' the feed-lifting bar, a guide in the said feedcarr'ier and a second slide adapted to slide in the guide of the lfeed-carrier and adapted to be reciprocated therein by engaging with the traversing caml for imparting oscillating movement to the feed-carrier.

3 In a sewing machine, the combination with a shaft, a cam mounted on the said shaft and a second cam mounted on the said shaft and angularly in relation to the first cam, of a feed lifting bar co-acting Wit-h the first cam, a stud on the said feed lifting bar a slide freely mounted on the said stud, a vertical guide fixed to the bed of the machine and in which the said slide is adapted to reciprocate, a feed-carrier pivotally mounted on the stud on the feed lifting bar, a Iguide in the said feed-carrier and a second slide adapted to slide in the guide of the feed-carrier and adapted to be reciprocated therein by engagingwith the traversing cam for imparting oscillating movement to the feed-carrier.

1l. In a sewing machine, the combination with a bed, a main shaft, a vearn mounted on the said shaft at the end of the bed Where the needle plate is situated, a second cam mounted on the said shaft and angularly in relation to the first cam, a plate fixed to the bed of the machine between the tivo Cams a ballebeariug for the shaft mounted in a hol in the said plate and a ballebearing at the other end` of the shaft mounted in the bed of the: machine, of a feed lifting bar co-act'- ing -wvith the firstcam, a stud on the said feed lifting` bar a slide freely lmounted 0n the said stud, Aa vertical guide in the fixedy a second slide adapted to slidepin the guide of the feed-carrier and adapted to be reciprocated therein by engaging With the second cam for imparting oscillating movement to the feed-carrier.

JAMES Coon, sm. JAMES COOK, Jemen. JOHN COOK.

Images