US1973639A - Sewing machine - Google Patents

Description

P 1934. H, J. LE VESCONTE 1,973,639

SEWING MACHINE Filed Aug. 2, 1952 s Sheets-Sheet 1 Sept. 11, 1934. J LE VESCONTE 1,973,639

SEWING MACHINE Filed Aug. 2, 1952 s Sheets-Sheet 2 Sept- 11, 19 4- H. J. LE VESCONTE SEWING MACHINE Filed Aug. 2, 1932 3 Sheets-Sheet 3 Patented Sept. 11, 1934 I 1,973,639

UNITED STATES PATENT OFFICE SEWING MACHINE Harold J.-LeVesconte, Western Springs, 111., assignorto Union Special Machine Company, Chi- ;cago, Ill., a corporation of Illinois 2 Application August 2, 1932, Serial No. 627,238 7 Claims. (01. 112 -214) The invention relates to new and useful imother pair of feed rollers located intermediate provements in sewing machines, and more parthe needle head and the base of the overhangticularly to a sewing machinewhich is adapted ing arm, and disposed so as to grip the fabric for sewing heavy wide sections of fabric in the sections in advance of a line extending at right .5 forming of relatively large articles. In the apangles to the line of feed and intersecting said plication filed by Norman V. Christensen and line of feed at the stitching point. The myself, July 25, 1932-," Serial No. 624,550 there present invention has to do particularly with is shown, described and claimed, a machine for an actuating means for two pairs of feed this. purpose, which includes a relatively long rollers. This actuating means includes an ec- 310' overhanging arm with a stitching mechanism centric on the main shaft with which an eccenat the free end thereof, and also a feeding tric strap cooperates. The eccentric strap immechanism having feeding members engaging parts oscillations to a rock shaft, and the rock the fabric sections adjacent the stitching point, shaft imparts an intermittent movement through and also feeding members engaging the fabric a suitable clutch mechanism to a shaft con- ..15 sections midway between the base and the free nected to the feed roller beneath the work supend of the overhanging arm. The present invenport and adjacent the stitching point. This tion is an improvement in the machine of the coshaft is out of alinement with the shaft carrypending application. ing the feed roller beneath the work support An object of the invention is to provide a and disposed midway between the free end and 20 sewing machineof the above type wherein the the face of the overhanging arm. There is a feeding elements at the stitching point, and the driving connection between these two shafts, feeding'elements intermediate the base and the which as shown, is in the form of a chain, so free end of the overhanging arm are driven that the single clutch mechanism operates, both from the same eccentric member on the main feed rollers.

25 shaft, so that the number of actuating parts Referring more in detail to the drawings, the

may be reduced to avoid lost motion and obbed of the machine is indicated at 1 in the drawtain better synchronizing of the feed moveings. Mounted on this bed is a work support 2. ments applied to the fabric sections. vAlso mounted on the bed is an overhanging arm In the drawings which show by way of il- 3 carrying a needle head 4 at the free end there- 30 lustration one embodiment of the invention of. Mounted for reciprocation in the needle Figure 1 is a front view of a machine embodyhead is a needle bar 5 carrying, as shown in the ing the improvements; r p 7 drawings, two needles 6, 6. Cooperating with Fig. 2 is a plan: view of the feed actuating these needles beneath the work support is'a devices mounted onthe bed of the machineand suitable complemental stitch forming mechlocated beneath the work support; anism. The material is held on the work sup- Fig. 3 is an end view of the machine; port at the stitching point by a presser foot Fig. 4 is a sectional view on the line A-- A of which is of the usual character. There. is the Fig. 1; and Fig. 5 isa sectional View on the line usualfeed dog operating through slots in the B-B of Fig. 2. throat plate 2 for feeding the material at the 40 The machine embodying the invention includes stitching point.

,a supporting bed carrying a work support and Located in rear of the presser foot are two a main actuating shaft extending lengthwise of cooperating feed rollers 7 and 8. The upper feed the bed and beneath the work support. Mountroller '7 is carried by a bar 7 mounted in suited on the bed is an overhanging arm which able lugs in the needle head 4. A spring '7 sur- 45 is secured thereto in any suitable way, and rounding the bar '7 yieldingly presses the roller which projects to the forward end of the bed. 7 into contact with the material.

At the free endof theoverhanging arm is a The lower feed roller 8 is fixed to a shaft 9 .needle head in which the needle bar recipromounted in bearing lugs 10, 10 carried by the cates carrying a needle of the stitch forming bed. Attached to the shaft 9 through a uni- 50 mechanism.- There is afeeding mechanism opversal connection 10 is a shaft section 11. This erating on the fabric sections at the stitching shaft section 11 is connected through a suitable point. There is also a pair of feed rollers louniversal connection 10 to a shaft 12. The cated directly in rear of the stitching point shaft 12 is mounted in bearings 12 12 carried which grips, and feeds the ;fabric sections away by the bed. Attached to the shaft 12 is a clutch 55 fr om the .stitchingmechani m- ,.The1fe is anvdrum lt. The clutch drum is given an inter- 1 10 mittent rotation by a clutch member freely mounted on the shaft 12 and having the usual form of clutch connection to the drum. This clutch member is oscillated by means of a link 13 connected to an arm 14 fixed to a sleeve 15 mounted for oscillation on a shaft 16 and held from endwise movement thereon by collars 17, 17. The shaft 16 is .mounted .in lugs 18,18 carried by the bed. The arm 14 is slotted, and the link 13 is connected to a stud attached to the arm and shiftable in the slot, so that the stroke of the arm 14 which is imparted to the clutch member may be varied. Also mountedon the sleeve 15 is an arm 19 carrying ,a 'stud 20 to which an eccentric strap 21 is connected. The eccentric strap 21 cooperates with 4.8.11 .e'ccentric 22 on the main shaft 23. Associated with the clutch drum 13 is a clutch member which prevents retrograde movement .of the shaft 12.

Asthe mainshaft 23 rotates, the eccentric 22 through the eccentric strap will impart oscilla tions to 'the arml l, and said arm in turn will intermittently rotate the drum 13 and thus impart intermittent rotations to the feed roller 8. The movements of 'the feed roller 8 are, of course, timed with the movements ofthe feed -dog, so that said 'feeddog and feed roller operateinsynchronism for the feeding of the material-to and from the stitching mechanism.

Located midway between the base 3 of the overhanging arm 3 and the needle head i is an auxiliary feeding mechanism including an upper feed roller 24 and a lowerfeed roller 25. The upper feed roller 24 is mounted in a yoke 26 *attached to a presser bar 27. This presser bar slides in lugs 28 and 29 carried by a bracket 30 secured to the overhanging arm. A spring 31 located between the lug 29 and the collar 132 fixed to the bar 27, yieldingly presses the roller ,24'into engagement with the fabric section passing beneath the overhanging-arm.

The feed roller 25 is fixed to a shaft 33. Th shaft 33 is mounted in bearing lugs .34, 35 .and '36 carried by 'a bracket-37 secured by bolts. 38 to the upstanding portion 1 of the bed. The bearing lugs 35 and 36 are located at eachside of the feed roller 25 and provide a .ver-ylfirm and durable support therefor. The shaft 33 carries 'a sprocket wheel 39at the end thereof. A chain 40 engages said sprocket wheel 39 and .also .engagesasprocket wheel llonthe endof the shaft The same intermittent movements which are imparted to the feed roller .8 from the shaft12 are imparted through the chained) to the shaft '33- and thence to the feed roller 25. The shaft .12: is attached through the universal connections to the-feed roller 8, and. therefore, does not require accurate alinement with the feed roller shaft. The shaft 12 is:also connected through the sprocket .chain to the .shaft 33, and therefore, does not require accurate alinement therewith.

LBothfeed rollers are positively driven. from :motion incident "thereto is reduced to a minimum, and the movements imparted to the feed rollers-are--insynchronism and of uniform :ex-

tion has to do more particularly with the operating mechanism for these feed rollers whereby :perfect synchronism of the feeding movements are obtained. The machine is particularly designed for uniting heavy fabric sections. One

'of *the fabricsections is passed beneath the over- .hangingiarm ;which;.is very long, so as to ac- ..commodate arelatively wide fabric section. The

feedrollers 24 and 25 will grip the forward edge of the fabric section slightly before it is reached :by the stitching needles, and this enables the placing of the fabric section beneath the arm 5 prior to the placing of the fabric section at the left of the stitching =mechanism,- as viewed-from the :frontcf the machine.

It -is obvious that minor changes in the :details of construction and the arrangement of ithe parts of the driving mechanism :may :be :made without departing from the spirit of the invention asset forth in the I appended claims.

Having thus described the invention, whatll claim --as new and desire-t0 secure by Letters-'- Patent, isi 1. In a sewing :machine, the combination of -.a supporting bed,-a-m'ain shaft, a work support carried-by saidbed, :an overhanging arm hav ing a supporting base :attached 'torsaidibed, :a needle head at the free end .of said overhanging arm, -a needlebar therein, a needle :carriedzby said needle bar, a feeding-mechanism :at the needle head, a' feeding mechanism intermediate the supporting :ba's and-the needle head, each M5 feeding mechanism including a"' feedroller, an eccentric onthe main shaft, an auxiliary shaft, a 4 clutch drum associated therewith, means op' era'tedby said eccentric for-oscillatingsaid clutch drum and imparting intermittent-movements to said auxiliary shaft, "devices connecting said auxiliary shaft to one of said feed rollers, a separate shaft-carrying the other *'feed=rol1er,--and devices operated -by the auxiliary *shaft f or actuating said separate-shaft. :2. -In-a-sewing'machine, the combination-of a supporting bed, a main shaft, a work support carried'by said bed, anoverhanging arm having asupporting base attached to-said bed, a needle head at the free ender-said -overhangingarm, a needle bar therein, -a needle carried by said needle' barra feeding 'mechanismat the needle head, a feedingmeohanism intermediatethe supporting base and the needle head, each feeding mechanism including a feed-"roller, an eccentric on the main shaft, an auxiliary shaft, -a:c'lutch drum associated therewith,- --me'ans operated by 'said -eccentric fo'r oscillating said clutch drum and imparting intermittent movements to said auxiliary shaft, a universal connection between said shaft and one-of said feed rollers, a-separate shaft supporting the other feed roller, and devices operated bysaidauxiliary shaft'for actuat- 'ing' said separate shaft.

- 3. In 'a-sewingriiachine, theoombination of a supportingbed, a main shaft, a work support c'arried by said bed, an overhangingarm having a supporting base attached to said' bed, a needle head at the free-end of said -'overhanging arm, a needle bar-therein, '-a needle carried by asaid F1750 needle bar, a feeding mechanism at the needle head, a feeding mechanism intermediate the supporting base and the needle head, each feeding mechanism including a feed roller, an eccentric on the main shaft, an auxiliary shaft, a clutch drum associated therewith, means operated by said eccentric for oscillating said clutch drum and imparting intermittent movements to said auxiliary shaft, a universal connection between said shaft and one of said feed rollers, a separate shaft supporting the other feed roller, and a chain and sprocket means for connecting said auxiliary shaft to said separate shaft.

4. In a sewing machine, the combination of a supporting bed, a main shaft, a work support carried by said bed, an overhanging arm having a supporting base attached to said bed, a needle head at the free end of said overhanging arm, a needle bar therein, a needle carried.- by said needle bar, a feeding mechanism at the needle head including a pair of feed rollers, one mounted above and the other below the work support, a feeding mechanism disposed intermediate the supporting base and the needle head and including a pair of feed rollers, one mounted above and the other below the work support, said feed rollers at the needle head being located in rear of the stitching point, and said feed rollers midway of the overhanging arm being disposed so as to engage the fabric in front of a line at right angles to the main feed and passing through the stitching point, a shaft carrying the feed roller beneath the work support at the needle head, an auxiliary shaft in alinement therewith and connected thereto, a clutch drum associated with said auxiliary shaft for imparting intermittent movements thereto, an eccentric member on the main shaft, devices operated thereby for operating the clutch drum, a shaft carrying the feed roller beneath the work support midway of the overhanging arm, said shaft being out of alinement with the auxiliary shaft, and means for imparting intermittent movements from the auxiliary shaft to said last named feed shaft.

5. In a sewing machine, the combination of a supporting bed, a main shaft, a work support carried by said bed, an overhanging arm having a supporting base attached to said bed, a needle head at the free end of said overhanging arm, a needle bar therein, a needle carried by said needle bar, a feeding mechanism at the needle head including a pair of feed rollers, one mounted above and the other below the work support, a feeding mechanism disposed intermediate the supporting base and the needle head and including a pair of feed rollers, one mounted above and the other below the work support, said feed rollers at the needle head being located in rear of the stitching point, and said feed rollers midway of the overhanging arm being disposed so as to engage the fabric in front of a line at right angles to the main feed and passing through the stitching point, a shaft carrying the feed roller beneath the work support at the needle head, an auxiliary shaft in alinement therewith and connected thereto, a clutch drum associated with said auxiliary shaft for imparting intermittent movements thereto, an eccentric member on the main shaft, devices operated thereby for operating the clutch drum, a shaft carrying the feed roller beneath the work support midway of the overhanging arm, said shaft being out of alinement with the auxiliary shaft, a sprocket wheel on the end of said auxiliary shaft, a sprocket wheel on the end of the shaft carrying the last-named feed roller, and a sprocket chain running over said sprocket wheels.

6. In a sewing machine, the combination of a supporting bed, a work support carried by said bed, a main actuating shaft beneath said work support, an overhanging arm having a supporting base carried by said bed, a needle head at the other end of said overhanging arm, a needle bar therein, a needle carried by said needle bar, a feeding mechanism including feed rollers located in rear of said needle, one of said rollers being located beneath the work support and the other being carried by said needle head, a feeding mechanism located intermediate the supporting base and the needle head and including feed rollers, one of which is located beneath the work support and the other of which is carried by the overhanging arm, an eccentric on the main shaft beneath the work support, an auxiliary shaft connected to the feed roller in rear of the needle, means operated by said eccentric for intermittently rotating said auxiliary shaft, and means operated by said auxiliary shaft for rotating the feed roller beneath the work support and intermediate the needle head and the supporting base.

-7. In a sewing machine, the combination of a supporting bed, a work support carried by said bed, a main actuating shaft beneath said work support, an overhanging arm having a supporting base carried by said bed, a needle head at the other end of said overhanging arm, a needle bar therein, a needle carried by said needle bar, a feeding mechanism including feed rollers located in rear of said needle, one of said rollers being located beneath the work support and the other being carried by said needle head, a feeding mechanism located intermediate the supporting base and the needle head and including feed. rollers, one of which is located beneath the work support and the other of which is carried by the overhanging arm, an auxiliary shaft located beneath the work support and having a universal connection with the feed roller in rear of the needle, an eccentric on the main shaft, a clutch drum carried by the auxiliary shaft and operated from said eccentric for intermittently rotating said auxiliary shaft, a shaft supporting the feed roller beneath the work support and intermediate the supporting base in the needle head, and a chain and sprocket means connecting said auxiliary shaft to said last-named shaft.

HAROLD J. LE VESCONTE.

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