US2223471A - Sewing machine - Google Patents

Description

Dec. 3, 1940. N. WALDMAN EI'AL SEWING MACHINE Original Filed Nov. 24, 1957 2 Sheets-Sheet 1 Dec. 3, 1940. N. WALDMAN ETAL SEWING MACHINE '2 Sheets-Sheet 2 Original Filed Nov. 24, 1937 n kl;

ANN

Patented Dec. 3, 1940 PATENT OFFICE SEWING MACHINE Nathan Waldman and Emerio Polimac, Chicago, 111., assignors to George I. Goldwyn and Herman Goldwyn. Chicago, Ill., copartners doing business under the Brothers name and style of Goldwyn Original application November 24, 1937, Serial No. 178,212. Divided and this application April 16,

1938, Serial No. 202,416

1' Claim.

This invention relates to improvements in sewing machines and it consists of thematters hereinafter described and more particularly pointed out in the appended claim. The present application is a divisional one, the subject matter herein having first been presented in our copending application filed November 24, 1937 and hearing Serial Number 176,212.

The invention is more particularly concerned with power driven industrial sewing machines adapted for darning and mending fabrics and wherein one or more needle threads are used. In darning or mending fabrics such as used burlap bags, the fabric operated upon is manually moved 15 back and forth and laterally in both directions without any particular regularity of movement until the stitches are interwoven to that degree which either closes the hole in the fabric or reinforces the worn place therein. As no regularity 20 of forward feed is necessary in a sewing machine of this kind, it is devoid of the conventional or other type of feed dog.

In operating upon fabric such as used burlap bags for darning or mending, a considerable 25 amount of dust, lint and foreign particles is dislodged from thebag and in sewing machines as heretofore were available for this purpose, such dust, lint and foreign particles easily found entrance to the internal mechanism thereof. In some instances said particles might be of an abrasive character so that wear quickly develops in the rapidly moving parts of said mechanism. Also dust and lint particles combined with the lubricant to form a hard paste-like substance having substantially no lubricating value. This substance not only hastens wear, but slows down operating speed and necessitates frequent lubrication by hand as well as stops for servicing.

One of the objects of the present invention is 40 to provide a sewing machine of the type for darning and mending fabrics wherein all moving parts for reciprocating the needle bar and for oscillating the shuttle are enclosed against the entrance 45 of dust, lint and foreign particles produced in operation and are lubricated by a circulation of clean oil so that wear on said moving parts is re duced to a minimum.

Another object of the present invention is to provide a lubricating system for sewing machines of this kind which is of a combined character in that it is partly force feed, partly gravity feed and partly splash feed.

The above mentioned objects of the invention as well as others, together with the advantages thereof will more fully appear as the specification proceeds.

In the drawings:

Fig. 1 is a longitudinal vertical sectional view through the operative parts of a sewing machine embodying one form of the invention, certain portions appearing in side elevation for a better illustration thereof.

- Fig. 2 is atop plan view of the base of the machine with parts appearing as broken away better to disclose the invention.

Fig. 3 is a top plan detail view of the head end of the overhanging arm of the machine and which will be more fully referred to later.

Fig. 4 is a transverse vertical detail sectional view through a part of the mechanism of the sewing machine on a somewhat enlarged scale as taken on the line 44 of Fig. 1.

Referring now in detail to that embodiment of the invention illustrated in the drawings, 20 indicates as a whole the base-of the sewing machine head upon which is mounted a hollow arm indicated as a whole as at 2|.

The base is'made as a one-piece casting comprising a hollow rectangular body 22 on the longitudinal median'line of which is a hollow extension 23 having a wall 24 at is outer end formed with laterally spaced shuttle race holding extensions 25-25. The top of the base is made flat to provide a bed-plate 26 for the sewing machine head as a whole of a width from front to rear approximating that of the body 22. a part of said base plate being formed as a laterally extending flange 21 on the top side of the hollow extension. In the bottom of the body is an opening 28, closed by a cover plate 29 and in the top side of the body is an opening 30, the purpose of which will soon appear. Depending from the top side of the body just forward of the opening 30 is a bearing boss 3|. An oscillating rock shaft 32 is journalled near its inner end in said boss and is journalled .near its outer end in the wall 24. An oil retainer 35 is provided in said wall to prevent leakage at this point of the lubricating oil with which the base is filled up to about the axis of the shaft 32.

The arm 2| includes a substantially upright hollow standard 36 and a horizontally disposed hollow extension 31 that terminates at its free end in a hollow head 38. The open end of said head is closed by a cover plate 39. The bottom end of the standard is suitably faced off for an oil-tight fit on the top surface of the body 22 of the base, the interior of the arm 2| as a whole communicating with the interior of the base through the opening 30 before mentioned. In the hollow extension 31 are provided inner end, intermediate and outer end bearing bosses 48--4l| and 42 respectively, in which a rotatable main driving shaft 43 is suitably journalled.

The main driving shaft 43 is provided at a point between the bearing bosses 48--4| with a crank 44 with which the top end of a connecting rod 45 is, operatively connected. The bottom end of said rod is operatively connected to a rock arm 46 arranged in the hollow body of the base and mounted on a hinge pin 41 that bears at one end in the boss 3| and that bears at its other end in an upright end wall 48 of the body 22. The rock arm 46 is operativeiy connected to the shaft 32 through suitable conventional mechanism indicated as a whole as at 49. This mechanism includes a block 58 pivoted on an arm 58 on the inner end of the rock shaft 32 and which block slides in a bifurcation 46- in the arm 46 as appears in Fig. 4, whereby rocking movement of the arm 46 operates to impart a rocking movement to the shaft 32.

An eccentric 5| is carried by the arm 46 at a point between the connecting rod 45 and the end wall 48 of the base body. This eccentric is disposed above an upright pump plunger 52 arranged in a cylinder 53 formed in the end wall 48 of the base body. The bottom end of said plunger normally engages upon a spring 54 in said cylinder and which spring exerts an upward pressure on the plunger. A port 55 formed in the wall 48 provides the inlet for the cylinder and a passage 56 in said wall, that is closed at its outer end, provides the discharge side or outlet for said cylinder. A spring pressed check valve 51 is provided in said outlet passage for the pump. The mechanism just above described best appears in Fig. 1.

In the rocking of the arm 46 and its eccentric 5|, the plunger 52 is reciprocated vertically, the eccentric providing the downward movement of the plunger and the spring 54 providing the upward movement therefor. When the bottom end of the plunger clears the port 55 in the upward movement of the plunger, oil passes through the port 55 into the cylinder. In the downward movement of the plunger, when its bottom end passes the port, it closes the same and imposes a pressure on the oil in the cylinder so that oil is forced out through the passage 56 for distribution as will later appear, the check valve 51 operating to close said passage on the suction stroke of the plunger.

60 indicates a balance wheel fixed to an extension 43 of the main shaft 43 outwardly of the bearing boss 48 therefor and which wheel is provided with a friction face 62. A pulley 63 is journalled on the extension 43 outwardly of the balance wheel and is provided with the usual groove 64 to receive a belt (not shown) whereby the pulley is driven from a suitable source of power. When the pulley is moved toward the balance wheel, it frictionally grips the facing 62 so as to drive the balance wheel and the shaft 43 to which it is secured.

The pulley 63 is normally held out of driving engagement with the, fly wheel by means of a spring 65 arranged axially of the shaft extension and between the extremity of said extension and a cap 66 carried by the pulley. This cap carries a thrust receiving member 61 in the form of a ball confined in the cap in line with the axis of the shaft extension.

To impart a thrust to the pulley to operatively engage it in driving relation with the balance wheel, the following construction is provided: 18 indicates an upstanding lever arranged at the right hand end of the base 28 and arm 2| respectively and pivoted at a point 1| between its ends on the standard 36. This lever includes an arm 12 that depends below the pivot 1| and an arm 13 that projects above said pivot. The free end of the arm 13 carries a thrust imposing member 14 for engagement with the thrust receiving member 61 of the pulley. The member 14 constitutes a screw threaded into the arm and secured in place by an associated nut. By this arrangement the parts may be adjusted into accurate operative relation. A contractile spring15 is secured at one end to the wall 46 of the base body and is secured at its other end to the lever arm 12. This spring normally acts upon the lever 10 to hold the member 14 out of engagement with the thrust receiving member as best appears in Fig. 1.

The lever 18 is operative against the action of the spring 15 by means such as a foot treadle (not shown) disposed beneath the head of the machine as a whole. 16 indicates a link which is connected at its bottom end to said treadle. The top end of said link is connected to one arm 11 of a bell crank lever 18 that is pivoted at 19 to the bottom portion of the base 28. The other arm 88 of said lever is connected to one end of a link 8|, the other end of which has a pin and slot connection 82 with the bottom end of the lever arm 12. A contractile spring 83 is provided between the link BI and bottom cover plate 29 of the base to assist the spring 15 in functioning for the purpose described.

When the foot treadle before mentioned is depressed, it exerts a downward pull on the link 16 and this operates to impose an end thrust on the link 8| in one direction (to the right as appears in Fig. 1). So soon as the play between the pin and slot connection 82 is taken up, the link 8| operates to swing the lever 80 counterclockwise to engage the thrust element 14 against the ball 61 to move the pulley 63 into driving relation with the balance wheel 68 so that the shaft 43 is driven from the pulley. When pressure on the before mentioned treadle is released, the springs 15 and 83 cooperate to swing the lever 18 in a clockwise direction in Fig. 1. This removes the element 14 from the ball 61 when the spring 65 functions to move the pulley out of driving relation with respect to the balance wheel.

85 indicates a bar associated with the head 38 of the arm 2|. This bar has sliding guided bearing in the top and bottom wall parts 86-81 of said head and carries a clamp 88 at its bottom end outside the head whereby one or more needles 89 may be operatively secured to the bar 85. In the head between the bar 85 and the boss 42 and operatively connected to the bar and to one end of the shaft 43 respectively is located mechanism indicated as a whole as at 9| (see Fig. 1) whereby the needle bar 85 is vertically reciprocated from said shaft and whereby the usual thread take-up mechanism in the head (not shown) is also actuated. As the mechanism 9| is conventional in lock stitch sewing machines, it is not believed necessary to describe the various parts thereof in detail.

In the head .38 immediately behind the needle bar is located the usual presser foot bar. As

" the presser foot bar and associated presser foot and like parts form no particular part of the present invention, the same is neither illustrated nor described herein.

The top wall 88 of the head 38 is made to provide an open 'top well I00 for holding a lubricating absorbing material such as cotton waste. A part of said well has its bottom IOI disposed at a higher elevation than the bottom of the remainder of said well and a vertical opening I02 is provided in the wall 86 between said bottom and the interior of said head 38. An absorbent wick I03 is disposed in said opening with its bottom end depending with a position to be engaged by a part of the mechanism 9| before mentioned, whereby said mechanism is lubricated. The right hand end of the well I00 is formed by a partition I04 that is lower in elevation than the bottom I0| before mentioned. This tends to produce a spillway. One end of a tube I05 having its major portion arranged in the arm 31 is secured in the partition to discharge into the well I00, the other endof said tube being connected to the outlet or discharge side 58 of the pump before mentioned in the base. A cover plate I06 is removably secured in the top surface of the wall 88 to close the well.

In the left hand end wall of the standard 36 of the arm 2| at the bottom thereof, is formed an open top pocket or well I01 (see Fig. 1). One end of a tube I08 arranged in the hollow base above the rock shaft 32 therein is fixed in the bottom of said pocket and the other end of the tube is arranged to discharge upon said shaft adjacent its bearing in the wall 24 of the extension 23.

A shuttle race body I30 is engaged in "seats 2511-230, provided therefor in the extensions 25-25 of the base. In the shuttle race body is located the usual shuttle body and associated mechanism, the shuttle body being operatively :Q' engaged by a driver I carried on the associated end of the shaft. The mechanism within the race body forms no particular part of the present invention and therefore need not be illustrated or described in detail herein because of the disclosure in our previously mentioned copending application.

when the sewing machine is in operation, the pump plunger 82 in its reciprocation in the cylinder 53 operates first to draw in a charge of oil from the hollow base 20 and force it up the tube II! to discharge into the well I00. This keeps the waste therein well saturated with oil, the excess oil flowing over the partition I04 to drain back toward and into the hollow base. A part of the oil in the waste in the well flows down the wick I03 so that in each cycle of operation of the mechanism 3| in the head, the wick is engaged to transfer oil to said mechanism for lubricating purposes. As the excess oil overflows the partition I04 and drains back toward the hollow base 20, a part'thereof washes over the bearing 42 for the shaft 43 and the remainder flows along the bottom wall of the arm 31 and then down the left hand wall of the standard 33. A part of this oil drains back into the hollow base 20 and a part flows into the pocket I01 and down the tube I08 to discharge onto the top side of the shaft 32 near its bearing in the wall 24 of the hollow extension 23. It is apparent that in the operation of the machine the arm 46 in its rocking movement will dip into the oil in the base 20 and produce a splash, a part of which will eventually lodge upon the connection for the rod 45 with the crank 44 as well as upon the bearings -4I for the main drive shaft 43. To facilitate supplying oil to the machine for replenishing purposes, the top wall of the arm 31 above and in line with the crank 44 is provided with a filler opening normally closed by a removable plug 2Ia. By reason of the use'of the wick for supplying oil to the mechanism Si in the head 38, there is no flooding or excess of oil at this locality so that oil cannot be thrown out through the usual slot in the head for the associated thread take up lever (not shown herein).

By reason of the construction described, all operating parts, except those of the shuttle are enclosed as a protection against wear, by reason of dust, lint and other foreign particles and lubrication of said parts is positive.

While in describing the invention we have referred in detail to the form, arrangement and construction of the various parts thereof, the same is to be considered only in the illustrative sense so that we do not wish to be limited thereto except as may be specifically set forth in the appended claim.

We claim as our invention:

A sewing machine embodying therein means providing a hollow base for containing a lubricant and a hollow overhanging arm thereon communicating at one end therewith and terminating at its other end in a hollow head, a main drive shaft in said arm, means providing a bearing in said head for one end of said shaft and which shaft has a portion disposed in said head, a needle carrying bar mounted in the head for a vertical reciprocating movement, means in said head actuated from the main drive shaft for reciprocating said bar, a second shaft in said base, means providing longitudinally spaced bearings in said base for said second shaft, means at one end of said base and driven from said second shaft for coacting with the needle in forming stitches, means for deliveringlubricant from said base to a well in the top portion of said head, said well being positioned above the bearing means for said main drive shaft, means for delivering lubricant from said well to said means in said head for reciprocating said needle bar, said well having a spillway in the interior of said hollow arm, said bearing means for said drive shaft being disposed below said spillway and in the path of the overflow so as to be lubricated from said overflow whereby the lubricant flowing from said spillwayis conducted by means of gravity along the lower interior wall of said hollow arm to said base, and means in said base for receiving the lubricant from said hollow arm and delivering the lubricant to at least one of said bearings for said second shaft.

- NATHAN WALDMAN.

EMERIC POLIMAC.

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