US2484495A

US2484495A - Electric sewing machine

Info

Publication number: US2484495A
Application number: US613261A
Authority: US
Inventors: Fischbein Dave
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-08-29
Filing date: 1945-08-29
Publication date: 1949-10-11
Anticipated expiration: 1966-10-11

Description

Oct. 11, 1949. o; FISCHBEIN ELECTRIC SEWING MACHINE 3 Sheets-Sheet 1 Filed Aug. 29, 1945 Oct. 11, 1949. D. FISCHBEIN 2,434,495

I ELECTRIC SEWING MACHINE File d Aug. 29, 1945 a Sheets-Sheet. 2

Oct. 11, 1949. 0.. FISCHBEIN ELECTRIC SEWING MACHINE 3 Shets-Sheet 3 Filed Aug. 29, 1945 Patented Oct. 11 1949 UNITED STATES PATENT OFFICE 2,484,495 I g g ELECTRIC SEWING MACHINE Dave Fischbein, Minneapolis, Application August 29, 1945, Serial No. 613,261

6 Claims.

--My present invention relates to improvements in" electric sewing machines of the type for closing, by sewing, the open mouth of a filled bag.

The primary objects of this invention are: first, to provide an electric sewing machine of simple construction and of such light weight that the same is easily carried by an operator in one of his hands and fed to its work while he uses his other hand to gather the sides of the open mouth of a stationary filled bag and holds the same as he feeds the machine thereto; and second, to provide novel means to facilitate chaining at the completion of the closing of the mouth of a filled bag by sewing. It may be here stated that chaining is the continuation of forming stitches by sewing after the material being sewed has been fed past the needle and said needle is no longer operating in a material. The purpose of ,chaining, at the completion of closing the mouth of a filled bag by sewing, is to prevent the stitches from unravelling. Or in other words, chaining acts as a tie or knot :in the thread at the completion of a sewing operation.

Other objects of the invention will be apparent from the following description, reference being had to the drawings.

To the above end, the invention consists of the novel construction and arrangement hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a perspective view of the improved sewing machine as held by an operator, his hands being illustrated by means of broken lines, while closing the open mouth of a filled bag, fragmentarily shown;

Fig. 21s a front elevation of the improved sewing machine;

Fig. 3 is an end elevation in which the electric motor is removed and its supporting means sectioned;

Fig. 4 is a rear elevation;

Fig. 5 is a View partly in plan and partly in horizontal section taken on the line 5-5 of Fig. 4;

Fig. 6 is a view partly in elevation and partly in section taken on the line 66 of Fig. 3, some parts being removed;

Fig. '7 is a view partly in plan and partly in section taken on the line 11 of Fig. 6;

Fig. 8 is a fragmentary detail view principally in section taken on the line 8-8 of Fig. 6, on an enlarged scale;

, .2 Fig. 9 is a front elevation of the throat plate, as shown in Fig. 8; and

Fig. 10 is. a fragmentary view of the throat plate shown in Fig. 9 turned overto show the back thereof.

passageway I3, is open. A displaceable plate l4 normally closes the open front of the shell H and is attached thereto by screws. Formed in the shell II, at the right-hand side of the passageway I3, is a throat l5 normally closed by a plate [6 secured to the shell by screws.

A handle I1 is provided for carrying and holding the sewing machine. This handle I! is tubular and is in the form of a. segment of a circle and extends over and above the shell II from the back to the front thereof. A bracket l8 rigidly secures the handle I! at its rear end to the back of the shell I I. A hole IS in the bracket I8 is coincident with the opening through said handle. The tubular handle I! affords a conduit for electric wires, as will presently appear.

The mechanism of the sewing machine is operated by an electric motor 2|]. This motor 20 is mounted on a frame 2| attached to the shell II by screws 22 that have threaded engagement with bosses 23 on the right-hand end of the shell II. The motor 2| is mounted with its armature shaft 24 upright and a small V-pulley 25 is secured on said shaft above the motor 20.

An upright shaft 26 is journaled in a bearing 21 in the top of the shell H and a lower hearing 28 in the right-hand section of the housing 12. This shaft 26 extends above the shell II and large V-pulley 29 is secured thereto in alignment with the pulley 25. A V-belt 30 is arranged to run over the

pulleys

25 and 29.

A switch 3| in the motor circuit mounted in the front end portion of the handle l'l includes a sliding thumb-piece 32 on top of said handle. The end portions of wires 33 leading to the motor 20 and switch 3| extend into the handle I! which afford a. conduit therefor. On the outer ends of the wires 33 is a plug 34, fragmentarily shown,

3 for attaching said wires to a suitable outlet, not shown.

Feed dogs operating in upper and lower slots 36 in the throat plate [6 are actuated by a feed bar 31 which receives its motion from an eccentric 38 on the shaft 26. The feed bar 31 is carried by a rocker frame 39 pivoted on an upright shaft 40 mounted in upper and lower bearings 4| in the housing [2. Collars 42 on the shaft 40 hold the rocker frame 39 against axial movement thereon.

A reciprocal needle bar 43 is mounted in bearings it in the housing l2. Mounted in the inner end of the needle bar 43 is a needle 45 that extends transversely through the passageway I3 for movement through a needle hole 46 in the throat plate l5. In the rear end of the needle bar 43 is a vertical passageway 41 through which twine z, with which the bag a: is sewed, is drawn by the reciprocating needle bar 43 from a cone on a spindle 48. The spindle 4'8 is secured to a bracket 59 on the back of the shell N. This twine runs through guides 50 and a tension device 5! on'the shell I I.

The needle bar 43 is reciprocated bya lever 52 intermediately pivoted at 53 to the shell H. An eccentric 5 s on the shaft 26 is connected to the needle bar 43 by an adjustable connecting rod 55.

C'o-operating with the feed dogs 35 is a presser foot 56 pivoted at 57 to one end of a bar 58. This presser foot bar is mounted for endwise sliding movement in a bearing 59' and a spring adjusting nut 5E. The bearing 59 is in the wall of the shell i i at the left-hand side of the passageway l3 and the adjusting nut to has screw-threaded engagement with the left-hand wall of the shell I I. An arm ti on the presser foot bar 58 extends outwardly through a slot 52 in the ball wall of the shell i l. A coiled spring 53' encircling the presser foot bar 5% is compressed between the adjusting nut Eli therefor and the arm 5i. This spring 63 is under strain to hold the presser foot 56 in cooperating relation with the feed dogs 35.

A hand lever 64 is provided for operating the pr'esser foot bar 58 to retract the presser foot 55 and permit the sides of the bag 17, at its mouth, to be placed between feed dogs 35 and the presser foot 55. This hand lever is intermediately pivoted at 55 to the back wall of the shell II. The lower end portion of the lever 64 engages the arm GI and its upper end portion extends transversely over and above the rear end portion of the handle ii. That portion 'of the lever 64 over the handle I? is bent into parallel arrangement with the re spective portion of said handle to afford a handpiece $6.

The location of the hand-piece 66 relative to the handle l? is highly important in that the operator, by tipping his hand, holding the sewing machine by said handle, backwardly, may operate the lever 64 to retract the presser foot and hold the same while inserting the sides of the bag as between said presser foot and the feed dogs 35.

Likewise, the mounting of the switch 3| on the front end portion of the handle I! positions the same where the operator can manipulate the switch member 31 with his thumb while gripping said handle and holding the sewin machine.

On the back wall of the shell II is a guard 61 for the projecting end of the arm BI and the free lower end portion of the lever 64. A guard 68 on the shell is provided for the projecting rear end portion of the needle bar 43.

"On the lower end of the shaft 26 1s the 'cus-- iii) tomary hook 69 and its heel it for forming loops in the twine 2 during the stitching operation of the machine. On the vback of the throat plate it is a chain-forming guide block ll having a twine supporting lip extension 12. A restricted passageway ill, a round inner hole 14 and a teardrop outer hole l5 are spaced from the needle hole ti; and from each other, in the order given, in the direction of the feeding of the machine to its work. The passageway 73 extends through the throat plate iii and the block H, the inner hole i4 extends through the block ll and the outer hole 75 extends through the throat plate IE to the block ii. The passageway 13 leads from the needle hole 5 to the inner hole 14 and the contracted end of the hole 15 is in communication with the passageway 73 and the inner hole 14. The block ii, at the hole 74, is countersunk, as indicated at 15.

The lip extension 72, over which the needle 45 extends when projected, prevents the twine z from dropping downwardly from the needle 45 into a position in which the hook e9 would not pick up said twine, when it passes over the needle 45, by entering the loop formed at the needles eye.

The purpose of the lip restricting the passageway i2 is to retard, by friction, the drawing of the twine z away from the needle 45 where the same could not be reached by the hook 69 in the process of forming a stitch.

It may be assumed that the last stitch has been made in the bag a" and the needle 45, during the next stitch-forming cycle, does not pass through the material and starts the formation of a chain. The first stitch in the chain will be between the needle 35 and the counter-sink 16. During the next cycle of operation, the first stitch will be drawn into the hole 14 and the wall of said hole, farthest from the needle 45, holds the twine z in a forward position to enable the heel 10 to enter the triangle formed in the twine during the stitch-forming cycle. The first stitch during the next cycle of operation will be drawn into the hole '55 to be out of the way of the second stitch entering the hole 74.

The counter-sink it facilitates the movement of a stitch away from the needle 55 and its entrance into the hole 74. It will thus be seen that the chain-forming stitches are progressively drawn away from the needle 45 by a step-bystep movement. The exact relative arrangement of the passageway '53 and the holes 74 and T5 to the needle 45 and each other and their several functions are hi hly important to the successful chaining operation of the machine.

From what has been said, it will be understood that the sewing machine described is capable of modifications as to details of construction and arrangement within the scope of the invention herein disclosed and claimed.

What I claim is:

1. In a portable electric sewing machine, a housing, an electric motor mounted on the housing, a handle overlying the housing and by which handle the sewing machine may be carried in suspension by one hand of an operator to its work and thus held during the operation thereof, in combination with a yieldingly held lever for operating the presser foot of the machine, saidlever being closely positioned to the rear end portion of the handle whereby the same may be operated by a rocking movement of the hand holding the handle.

-2. In a portable electric sewing machine, a housing, an electric motor mounted on the housing, a handle overlying the housing and by which handle the sewing machine may be carried in sus pension by one hand of an Op to its Work and thus held during the operation thereof, in combination with a yieldingly held lever for op-- erating the presser foot of the machine, said lever having a hand-piece extending transversely of the handle at the rear end portion thereof, whereby the same may be operated by a rocking movement of the hand holding the handle.

3. In a portable electric sewing machine, a housing having an open bottom passageway through which the needle of the sewing machine operates, an electric motor mounted on one side of the housing, a handle overlying the housing substantially parallel to the passageway and by 'Which handle the sewing machine may be carried in suspension by one hand of an operator to its work and thus held during the operation thereof, said housing and electric motor being in balanced arrangement transversely of the handle, in combination with a switch in the circuit wires of the motor mounted on the front end portion of the handle, and a yieldingly held lever for operating the presser foot of the machine having a hand-piece extending transversely of the handle at the rear end portion thereof, whereby the same may be operated by a rocking movement of the hand holding the handle.

4. A portable sewing machine, a substantially U-shaped housing including a base, standard, and an overhanging arm, a motor secured on the base, needle and looper mechanisms carried in the lower ends of the overhanging arm and the base respectively, said motor having operable connection with the needle and looper mechanisms, a handle secured to the housing and overlying the base thereof opposite the looper mechanism, and said handle being disposed centrally above the concentrated center of gravity of the combined motor and housing whereby the machine may be readily suspended from and manipulated by one hand of the operator during the sewing operation.

5. A portable sewing machine, a substantially U-shaped housing including a base, standard, and an overhanging arm, a motor secured on that face of the base opposite the overhanging arm, needle and looper mechanisms in the lower ends of the overhanging arm and base respectively, said motor having operable connection with the needle and looper mechanisms, a handle secured to and transversely overlying the housing intermediate the overhanging arm and the motor opposite the looper mechanism, and said handle being disposed centrally above the concentrated center of gravity of the combined motor and housing whereby the machine may be readily suspended from and manipulated by one hand of the operator during the sewing operation.

6. A portable sewing machine, a substantially U-shaped housing including a base, standard, and an overhanging arm, a motor secured on the base, needle and, looper mechanisms carried in the lower ends of the overhanging arm and the base respectively, said motor having operable connection with the needle and looper mechanisms, a handle secured to the housing and overlying the base thereof opposite the looper mechanism, said handle being disposed centrally above the concentrated center of gravity of the combined motor and housing whereby the machine may be readily suspended from and manipulated by one hand of the operator during the sewing operation, and a lever for operating the presser foot of the machine having one end thereof terminating adjacent one end of the handle.

DAVE FISCI-IBEIN.

REFERENCE S CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 669,972 Anderson Mar. 19, 1901 1,358,567 Mofiat et a1. Nov. 9, 1920 2,051,118 Weber et al Aug. 18, 1936 2,055,165 Wood Sept. 22, 1936 2,065,413 Zimmermann Dec. 22, 1936 2,138,760 Fleckenstein Nov. 29, 1938 2,169,528 Heffron Aug. 15, 1939 2,176,977 Nocolay Oct. 24, 1939 FOREIGN PATENTS Number Country Date 651,455 France Oct. 9, 1928