US1617338A

US1617338A - Sewing machine

Info

Publication number: US1617338A
Application number: US6041A
Authority: US
Inventors: Bernard T Leveque
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1925-01-31
Filing date: 1925-01-31
Publication date: 1927-02-15
Anticipated expiration: 1944-02-15

Description

Feb. 15, 1927. 1,617,338

B. T. LEVEQUE SEWING MACHINE Filed Jan. 31, 1925- fi 0 I Patented Feb. 15,1927.

JERSEY. I

application filedfaanuary 31, 1925." senai'no. 6,041. v f The present invention:- relates; .to sewing; machines .and 11101381: particularly to. ;.a needleguide mechanism for outsole; lock stitch: shoe sewingrmachines. 3. :1. 1:5 .5

In :certaintypes of lock stitch shoe sew ing machines, as-,.f0r instances, wt-he type 3 of machine disclosed in the patent to Ashwort-h No: 1,169,909, it. .is customary to provide the needle guide with' a thread a guard to i prevent the needle loop fronrcatching on. the needle uide .as thBz4l0OP .is being 'ipassed around the bobbinrcase J 'u.;..

object .of the, present ;.invention,.is ,to provide a machine .of :the type requiring a thread-guard iior. the; needle, iguide, with a needle .guide havingraecutting edge. or; edges to form a stitchreceiving .groove fin-the ,shoe sole and :with a threadguardswhich ..Will not interfere with ,the;,op erationjqf the-AGE: dle guide in forming the stitch receiving groove. With this'objeot Ziniview the present invention provides a thread guard which is maintained in position to prevent the needle loop from catching on the guide when the guide is in retracted position, but which is adapted for movement relative to the guide so as not, to interfere with the formation of the-stitch receiving groove when the guide is brought down upon the work. In the preferred form of the invention the thread guard is yieldingly mounted on the needle guide so that upon presentation to the work the guard may be held in engagement with the work while the groove cutter continues its movement to form'the stitch receiving groove.

A further object of the invention is to provide a needle guide mechanism of im proved construction and operation, and with this object in view the invention consists in certain novel features of construction, combinations and arrangements of parts hereinafter described and particularly defined in the claims.

In the accompanying drawings Fig. l is a side elevation of the preferred form of the invention with the needle and needle guide in retracted position; Fig. 2 is an elevation of the mechanism showing the arrangement of the parts when the needle guide is brought into engagement with the work;

Figs. 3 and,& are views similar to Figs. 1 and 2, showing the mechanism from the 0p BERNARD T. LEVEQUE, or 'nAssAo'H snrrs, ass'rGivoR To UNITED srion MACHINERY CORPORATION, or rATnRsoN, NEW nRsEY,A co roR. irIo1v or new J WWe A NE- g l pl: ;,w.# I; H positevside. the mechanismnwlth 'th position ;.Fig.-;6

showing;- :th'ei guide .111 engagement with thel'wor =1 is a'iiplav wer-a portion of} the work I showingg i'paritially completed seaml Fig .3 s isi-a sectional: tllexa k detail f view wof th shown in:Fig. 7. E :The illustrated embodiment: =0, tion (comprises: a: work lsupfpdr a curved hook. needlelalfig uahn'eed'le- CZtIlI'lBliMlfih, and a needle cairri'er actuating bellqcranlr 16:, allilof;

which are or may be of the gene-ral typead closed. .in; the apatent to Ashwortl-L- above greferredito. The En-eedle passes through;, a; neee I dle guide 18:.securedtt-ona sneedle: guide] car;- rier 20, the needle-guide.beingsprovided'witli cutters" 22 ionxoppesite-rsides: i of the needle for forming :a; stitch receiving groove in; the work.--. The needle; carrier; and; Ztheg needle guide carrier are provided with hubs 24 and 26-respectively, which are mounted for oscillatory movement upon a shaft 28. The needle carrier is oscillated by movement of the bell crank 16, and the movements of the needle carrier are transmitted to the needle guide carrier by means of a spring 30 having one end attached to a projection 32 of the needle carrier and the other end.

secured about a post 34 attached to the needle guide carrier, thev spring being coiled about the axis of the

hubs

24 and 26. This spring afiords a yielding movement of the needle guide towards the work as the needle moves on a downward stroke, and the formation of-thespring about the axis of the a boss 36 extending outwardly from the hub of the needle'guide carrier.

Pivoted at 38 upon the needle guide carrier is a thread guard 40 consisting of a plate, the end portion of which extends above the needle guide 18 throughout the lengthof the latter in order to prevent entanglement of the loop of thread as it is passedabout the bobbin case by the rotary hook ofthe machine. The opposite end of 'of the needle guide carrier.

the thread guard is connected by means of a light tension spring 42 with the post 34 The thread guard 40 is provided with an inwardly extending projection 44 which is adapted to abut against the surface of the needleguide and properly position the thread guard'when the needle guide is in retracted position, as shown in Fig. 1. When the needle guide is oscillated toward the work, the thread guard comes into engagement with the work substantially simultaneously with the groove cutter 22, and during continued movement of the groove'cutter to form the stitch receiving groove the thread guard is supported by the work, relative movement between the thread guard and the needle guidebeing permitted by virtue of the yielding connection between these parts. Upon retraction of the needle the needle guide is also retracted, and as the groove cutter moves away from engagement with the work the thread guard is urged by the spring 42 into its normal. position for protectingthe needle guide from catching the loop of thread, as shown in Fig. 1.

The nature and scope of the invention having been indicated and the preferred form of the invention having been specifically described, what is claimed is:

1. A lockstitch sewing machinehaving,

in combination, stitch forming devices including a hook needle, a needle guide havcludinga hook needle, a needle guide having a cutting edge for forming a stitch receiving groove in the work, a thread guard forv the needle guide, and means for vield'ingly" mounting the thread guard with relation to the needle guide to permit indentation of the work bythe cutting edge of the, needle guide without interference by the threat guard. V 1

3..A lockstitch-. sewing machine having, in combination, stitch forming devices inv eluding a hook needle, a needle guide having a cutting edge for forming a stitch receiving groove in the work, a thread guard pivoted on the needle guide, anda spring connecting the thread guard and the needle guide to permit relative movement between. the thread guard and-needle guide as the latter performs the groove cutting operation.-

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

BERNARD T. LEVEQUE,