US1484191A - Needle guard for sewing machines - Google Patents

Description

Feb. 19, 1924; 1,484,191

- q. C. RINGE I Y NEEDLE aqmb FOR 'SEWING MACHINES Filed Aprfl 50'. 192:' 2 Sheets-Sheet 1 INVENTOR 7 John 6217 BY a m-4 4;

WITNESSES:

ATTORNEY Feb. 19, 1924.-

.|-.- c. RING E NEEDLE GUARD FOR sswme mcnmss me April 30. 19211 2 Sheats-Sheet 2 INVENTg? Jqlm 6'. in BY j ATTORNEY Patented Feb. 19, I924.

stirs:

JOHN c. BINGE, or s'rnnrronn, conn'noricucu, nssieivon To THE SINGER MANUFA Ci .TURING comrnnnor nii znnnrn, NEW JERSEY, A conronn'r on on NEW JEnsnY."

NEEDLE eunnn ron SE ING MACHINES.

Application;filcdApril so, 1921; Serial no. 465,720.

To all whom it may concern."

Be it known'that- I, JOHN C. RrNGE, a citizen of the United States, residing at Stratford, in the county of Fairfield and State of- Connecticut, have invented certain new and useful Improvements in Needle Guards for Sewing Machines,-of which the following is a specification, reference being had therein to the accompanying drawings. This invention relates to improvements in needleand needle-thread loop guarding de vices particularly adapted for use inconnection with sewing machines in which the needle moves laterally in and relativelyto the material being operated upon, as in hemstitching machines.

Lateral movements toward the loop-taker of the needle while in the material have a constant tendency to bend or deflect the needle, rendering uncertain the seizure of the needle-thread loop by the loop-taker. This is especially true when operating upon very closely woven and wiry materials. There is furthermore a tendency, particularly when operating at high speed to throw out the needle-thread in the opposite direction from its lateral movement, thereby robbing the needle-thread loop to be entered by the loop This taker on the other side of the needle. naturally has also a tendency to occasion skipping of stitches.

The present invention has for its primary object to obviate these dificulties by the provision of a guarding device functioning to properly position the needle with respect to the loop-taker and also to back up the needle to prevent the throwing out of a needlethread loop on the wrong side of the needle.

The invention has also for its object to provide a guarding device for the purpose referred to permitting adjustment of the lateral throw of the needle i. e., of the width of the hemstitch figure.

The invention has for a further object to provide a guarding device of this character with means permitting adjustment of the path of movement of the guarding device. Other objects of the invention will be apparent from the following description and claims.

In one embodiment of this invention, the present improvement has been applied to a hemstit ching machine in which the needle is .reciprocated endwise and actuated laterally i by well known means to penetrate thematerial on andoif the hem-fold. The feeding mechanism of the machine, as usual, includes, a feed-dog to which are imparted two forward feeding movements and onebackward L feeding movement in the formation of each hemstitchfigure. As is well known, the

to penetraterthe hemffold of-the material needle is caused by its actuating mechanism immediately following the first forward feeding movementv of the feed-dog, descending below the work to throwout a loop in mental loop-taker. The needle then rises and the second forward feeding movement .properposition for seizure by the complement i. e., while in the material, it is again moved laterally in the opposite direction to draw. the threads of the fabric and at the same time to bring the needle-eye into proper i position with respect to the loop-taker beak to form thestitch. The needle then rises and a backward movement of the feed-dog occurs while the needle is again moved laterally to penetrate the material off the .hem-

fold, whereupon a like action occurs while in the material.

It will be seen that in order to provide a needle-guard fora needle of thischaracter, it is essential that the guard. be out of the i way of theneedle when penetrating the ma -u! terial off the hem-fold and nevertheless catch up with the needle moving laterally in the material so as to back up thethread-to insure the formation of the loop on the looptaker side of the needle and also to insure proper positioning of the needle-eye-withwrespect to the loop-taker beak' hate its ends and. actuated from an eccentrio on the loop-taker shaft. The fulcrum 1 J for the needle-guard is in the form of a. stud eccentrically secured so as to permit adjust-.

ment of the path of movement ofthe needleguard, while the throw ofth'e'guard is pref-, erably such as to permit of aslight adjustment of the lateralthrowof the needle.

In the accompanying drawings, Fig. '1 is a View in elevation andpartly insection of the front side of a hemstitching machine em bodyi'ng the present improvement. Fig. 2 is V a front end elevation of the same. Fig. 3 is a perspective View of the needle-guard, its

supporting stud and its actuating means;

' the point of the'needle is below the throating for the needle-bar.

plate. I

Referring to the drawings, the hemstitching machine in which the present-improvement has been embodied is shown as constructedwith a base 1 fromwhich rises a hollow standard 2-curving into anloverhanging arm 3. terminating ina head 1. Mount ed for vertical movements in suitable, bearings provided in the head llis theusual pre'sser-bar 5 carrying the presser-iteet, as '6. Journaled in the overhanging arm is the main-shaft 7, carrying atone endthe beltpulley. 8 and at its other, end suitably connected bycmeans of shaft-flange 9 and link 10 with'the needle-bar 11' journaled for .ver-c tical reciprocation in the head 1.. Secured by means of the screw 12 to the lower :end

.. of theneedle-bar is the bracket 13, carrying the. piercer land upon which is tulcrumed,

bymea'nsrof the screw 15, the needle-carrying clamp 16. The needle-carrying clamp 16 is'suitably socketed for the reception of the .shank' of the needle 17 secured therein by. means of a set-screw 18. Secured in the needle-clamp 16 by means of the'set-screw 19 and projecting upwardly therefrom is the needle-vibrating rod 20 of which the upperend. is slidingly mounted 'in the swiveljoint21 carried a vibratory guide-bar 22 supported at its upper end forswinging movements upon a pivot-screw 28 threaded into the block 24: affording an upper bear- To steady the swinging movements of theguide-bar-22 the lower end thereof is provided with a guiding fin 25 entering a notch in the block 26 affording a lower bearing for the needle bar. 1

Intermediate its ends the guide-bar 22 is suitably connected. with one end of needlevibratin'g connection 27 of which the opposite end is suitably connected withthe depending end of an arm 28 adjustably secured by means of thescrew 29 in a suitable slideway provided in the radial-arm 80, fulcrumed upon the machine-frame and deriving vibratory movements from the usual cam-'31 secured upon the secondary shaft 82.

The secondary shaft'32'is suitably journaled inthe machine-frame and carries a gear-33 in mesh with a pinion 34: secured upon the main-shaft 7. It will be apparent that rotation of the main-shaft 7 will,

through the described connections, impart lateral movements to the needle andthese movements, as is wusualiin hemstitch nachines, cause the needle to reciprocate once inastraight pathand then twice while lat eral movements areimparted thereto both in and out of the material for each hemstitch figure. 7 a c The feeding mechanism comprises a feeddog 35 operating through suitable slots 36 provided in the throat-plate 37 and is car ri'ed by the feed-bar 38 actuated in any: suitable manner, one form of which actuating mechanism is disclosed and described in the V U. S. patent ,to' C. M. Abercrombie, No.

1,271,256, oi July 2, 1918. I As feeding mech- 'anisms of this character are well known in .the art and as the particularform employed is unimportant to the present invention, it

is deemed unessential to hereindescribe such a mechanism tor a complete understanding of the present improvement.

Carried by the main-shaft tie the beltpulley 39 connectedby means of the belt 40 with the pulley ll suitably secureduponthe loop-taker actuating shaft 12. The looptaker actuating'shaft 42'is suitably jour naled beneath the cloth-plate l8 andcarries the bevel-gear 1 1 in mesh with a similar gear 45 suitably secured upon the loop-taker shaft 46 carrying'the loop-taker 47, Y the shafts a2, 46 being journaled to suit-ably enclosethe bevel-gears 14i, as within a housing 48 secured beneath the cloth-plate. The construction thus far described comprises one well known ,form of hemstitching ma-V chine and the several parts thereof cooperate in the usual manner in the formation of hemstitches. V I

Referring now more particularly to the subject of this inventioma needle-guard 49 is provided intermediate its ends with a hub 50 fulcrumed upon a pivot-screw'5l eccentrically journaledin .a lug 52 provided on a plate 58 suitably secured :upon the housing 48 by means of screws, aslfil. The c eccentric-stud or pivot-screw 511s secured in adjusted position by means of a set-screw 55.

The lower end of the needle-guard 49 is connected by means of a pitman 5.6 andstrap 57 within an eccentric 58 suitably secured ,upon the lower. end of the loop-taker shaft 416,

whereby the upper end of the needle-guard is caused to approach and recede from the loop-taker through a suitable cut away portion in the feed-dog 35. The operative face of" the needle-guard is notched centrally thereof to a depth indicated bythe, dotted vline 59, in order to insure its action uponthe needle 17 Referring now more particularly to Figs 4, 5 and 6 the throat-plate 137 is shown as provided with the usual elongated needleaperture 60 permitting lateral movements therein of the needle "17 transversely of the direction of feed, and the dot-dash linel.

m-g represents the, loop-takingposition of the loop-taker beak. Fig; 4 shows the needle in the position it occupies immediately after penetrating the materialiofi' the'hem I fold and just preceding the beginining of its fabric-thread drawing movement to the right. The position of the needle-guard 49 in Fig. 4 indicates that it is out of the way of the needle 17 and in fact sufiiciently so to permit a small adjustment of the lateral throw of the needle. As the needle now commences to move to the right while continuing its descent, there is a marked tendenc to spring the needle by its action on the abric-threads, as well as a tendency to, by reason of inertia, throw out the needle-thread on the left hand side of the needle. In order to overcome both of these tendencies, the needle-guard 49 is caused to follow the needle at a greater rate of speed than that of the laterally moving needle 17 Fig. 5 shows the needle in its lowest position wherein it has completed approximately a half of its lateral movement. It will be observed that the needleguard is now very close to the needle. The needle now begins its ascent while continuing its lateral movement until it reaches the loop-taking position illustrated in Fig. 6. The needle-guard 49 is now close to the needle and insures this position in spite of deflection in the opposite direction from that of its lateral movement. It is of course to be understood that when the needle penetrates the material on the hem-fold, i. e., without lateral movement, the needleguard likewise is in position to back up the needle and its thread to cause the needlethread loop to be thrown out to the right, or in the direction of the loop-taker.

In case it is desired to alter the position of the needle-guard at loop-taking position, it is; only necessary to adjust the eccentricstud 51.

Having thus set forth.the nature of th invention, what I claim herein is 1. In a sewing machine, in combination,

a needle, means for imparting endwise reciprocating movements to said needle, a loop-taker complemental to the needle in the formation of stitches, means for imparting lateral movements to the needle in and relatively to the material being stitched, a needle-guard, and means for actuating said needle-guard in timed relation with respect to said lateral movements of the needle to insure in successive stitches a substantially constant relative position of the needle and loop-taker at' the time of seizure of the needle-thread loop by said loop-taker.

2. In a sewing machine, the combination with stitch-form1ng mechanism including a needle and complemental loop-taking means,

movements of the needle to insure in successive stitches a substantially constant position of the needle and loop-taking means iit the time of seizure of the needle-thread 3. In a hemstitching machine, the combination with a needle and a loop-taker having a substantially constant position at the time of seizure of the needle-thread loops, and means for imparting work penetrating and thread-drawing movements to said needle, of a needle-guard retracted out of the way of the needle during the workpenetrating movements of the latter, and means for actuating said needle-guard at a greater rate of speed than the rate of lateral movement of the needle to correct inadvertent deflections of the needle.

4. In a sewing'machine, the combination with stitch-forming mechanism including a needle and a complemental loop-taker, of a vibratory needle-guard, a fulcrum for said needleard, means for oscillating said needle-guar upon said fulcrum, and means permitting adjustment of the fulcrum of said needle-guard to vary the position of the latter in a plane of the needle-path of movement whereby to determine the position of the needle-point with respect to the loop-taker.

5. In a sewing machine, in combination, a needle, a loop-taker, means for vertically reciprocating said needle, feeding mechanism, means for laterally vibrating the needle toward and from said loop-taker in a direction substantially transverse to the line of seam-formation, a guard-device, and means for actuating said guard-device to back up the needle during its lateral movements toward the loop-taker.

In testimony whereof, I have signed my name to this specification.

JOHN G. RINGE.

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