US1847537A - Thread severing mechanism for looping machines - Google Patents

Description

Mrh l', 1932. P. D. REDCAY THREAD SEVERING MECHANISM FOR LOOPING MACHINES Filed Sept. 28, 1928 2 Sheets-Sheet March l, 1932.- P. 0. REDCAY THREAD SEVERING MECHANISM FOR LOOPING MACHINES Filed Sept. 28, 1928 2 Sheets-Sheet 2 Patented Mar. 1, 1932 UNITED STATES PATENT OFFICE PAUL D. BEDCAY, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR; BY MESNE ASSIGN MENTS, T UNION SPECIAL MACHINE COMPANY, 'OF CHICAGO, ILLINOIS, A COR-J i IORATION OF ILLINOIS l THREAD SEVERING MECHANISM FOR LOOPING MACHINES 6 Application filed September 28, 1928. Serial No. 309,024.

This invention relatesto a thread sever- 111g mechanism for use in connection with a looping machine of the type employed for uniting parts of stockings or other knit work or fabric whereinthe parts'of the'stockings or other knit work are united by a continuous chain of stitching which must be'severed at points between the stockings.

The object of the invention is to provide an improved severing device for such, alooping machine which willfautomatically sever the chain of stitching that unites the several stockings or other knit fabric on the machine sothat the projecting threads at each side of the sewed stocking, whichis left, after the severing operation, will beof a substantial uniform length.

A further object of the invention is to pro-, vide a severing mechanism in combination with an automatically operated feeding means for feeding the loose chain of stitches.

between the stockings into the path of the severing mechanism. i I

Further objects of the invention will appear more fully hereinafter.

The invention consists substantially in the combination, construction, arrangement and relative location'of parts all as will be'morefully set forth as illustrated-in the accom+ panying drawings and finally pointed out in the appended claims.

Referring to the accompanying drawings in which the same or similar parts have been referred to in the. various views by the same reference numerals,'

Figure 1 is a sideelevational view, partly in section, of sufiicient of'a looping machine, to illustrate my thread severing device ap plied thereto. I

Fig. 2 is a plan view of the mechanism illustrated in'F-ig. 1.

Fig. 3 is a side elevationof the thread severing device taken on theline 3-3 in Fig.

2, looking in the direction of the arrows.

Fig. A} is a side elevation of the thread severing device taken on the lined-4 in Fig.

2looking in the direction of the arrows.

f 12. 5 1s an end v ew of the threadsever- Flg. 61s a detail side elevational view of the cutting blades of my thread severing de- I vice.

, Machines for uniting or sewing together the parts of knit goods such as'stockings, of the type to which my thread severing device is applied, are well known in the artand it is'thought unnecessary to show herein or describe in detail the complete construction and operation thereof. An illustration of a machine of this general type is shown and described in the patent to Merrow, No. 330,606; dated November 17, 1885. It is sufficient to say that generally machines of this type are providedwith a circular bed or support having a stitch forming mechanism po-- sitioned with respect to said bed or supportso that its stitch forming elements operate over a' circular movable work supporting member which isrotatably supported on the circular bed or support. The movable worksupporting member carries a series of radially projecting impaling pins which move with said support past the stitch forming mechanism.

In the operation of themachine the portions of the stockings or other knit fabric to be united are placed on the impaling pins in such a manner that the edges of the same project'slightly above the impaling pins and the stitch forming: mechanism operates to place a line of stitching in the projecting edges of the stockings or other knit fabric as the movable work supporting member causes the same to pass within the field of action of the stitch forming mechanism. The articles to be stitched in this manner are usually placed upon the impaling pins a slight distance apart. The stitching mechanism is continuously operated and therefore the threads carried by it will extend continuously from one article to another just above the impaling pins; When i the stitched articles are removed from the impaling pins it is therefore necessary to sever these connecting threads between the articles. This is accomplished either by hand onby mechanism provided for that purpose;

In the drawings illustratlng my improved cutting device, I have only shown sufficient of such a looping machine to illustrate the apmovablework supporting member is indica'te'd at 4. The impalingpinscarried bysaid movable work supporting member are shown at 5 and project radially from said movable supporting member in the usual'well known manner. p

The thread severing mechanism of my mvention is mounted-at any suitable point on the circular bed or support lbeyond the stitch forming mechanism. The said mechanism may bebnerated from any suitable moving pant of the machine. One proposed means forbperating :the saineis illustrated in the drawings and will be described hereinafter.

The operating parts-of the severing mechanismare supported by a bracket'member 6 which is secured to the circular bed or support ofzthe machine by-means'of the screw 'r'. Said bracket memheris providedwith'anoutwardly-extendingiarm 9 which may be formed integnal with said bracket member or detachably secured thereto. by a screw 8 or othersuitable means.

The *freeend of said arm 9 carries a shortrotatable'shaft' :10. Fixedl-y secured to said shaft is the :ratchet wheel 11 and-the circular 7 brush 12.

:Pivotally secured to bracket member 6 as at 1-3 is a camshapedmember lt'having a projection 15 The cam shaped member is also pivotally secured as at 15a to a pawl anember 16. The free-end of said pawl member is adapted 'to-en jage the teethof the ratchet wheel 11 and is held in engagement with the teethof said ratchet wheel by means of a spni-ngl"? which is-securedat oneend to said 4 pawl member and at the'otherend to the-pin 1'8-mounted in said supporting bracket 6.

. Mounted onsaid bracket member-6 is a stationary cutting'member 19 which is integrally secured to said bracket and is positioned so that its cutting edge extends adjacent to the impa-l-ing pins-5 on :the movable work support member 4 and behind the edges of the article imposed on the impaling pins.

'Thepin 1'8 mounted in supporting bracket 6 pa'sses through the-stationary cutting member 19 and supports the movable cutting member21. Themovable cutting member is posiwith a rearwardly extending arm tioned with respect to the fixed cutting mem-- ber 19 so that its'cutting edge has a shearing action with the cutting edge o'fsaid member 19 and is held in such shearing position by nut 20. a

The movable cutting member is provided which is I to said cam shaped member andsaiclmovable arm. Also secured between the arm 22 and the-circular base plate is thespring 26 which is adapted tonormally hold said arm so that the cutting edge of the movable cutting blade is closed with respect to-the cutting edge of the stationary cutting member.

The operation of the cutting mechanism described above is as follows: After astoc'king or other article-imposed upon the impa'ling'pins has been stitched by the stitching mechanism thus forming a slightly projecting stitched portion or welt it passes to the cutting mechanism. The eccentric 23 which is continuously rotated on shaft 24L actuates the arm 22 of the movable cutting member causing said cutting member to rock on the pin 18 soas to have a shearing action with the fixed cutting member 19. The -movement of the arm .22' of the movable cutting -memberfa'lso-causes the cam shaped member 14 to actuate the pawl '16 so that it rotates the ratchet wheel 11-and consequently rotates the circular brush 12. The brush is so'positioned with respect to the impaling pins 5 sameinwardly and towardsthe cutting edges of thecutting members 19 and21.

As eaohsone of the stitched articles passes by the cutting mechanism the brush sweeps the connecting thread 29 between such stitchedarticle and the next stitched article, inwardly, into the field of action of the cut- 31?}OI1C8 severed. In view of the relative po- 7 sitions of the several parts .it-can be seen that the thread is severed at substantially equal distances from the-knitted articles.

In order to insure thethread-extending between the stitched articles being swept into the path of the cutting members a guard 28 may besecured to the plate 27 which may be mounted on the pin 18 of the supporting bracket and held in place by said nut 20 anda guard31 may be mounted onan extension 32 secured to said supporting bracket so that the brush will sweep the thread between said guard and the impaling pins into the path of the cutting members.

It will be seen that by the action of the several parts of the above described severing mechanism that the stitching thread which extends between the stitched articles will be severed positively and automatically and the projecting threadsiat each side of the that in rotating it brushes across the sewed article after the severing operation will be of a substantially uniform length.

Having now fully described my invention, what I claim as new and desire to secure by Letters Patent is 1. A sewing machine including in combination work suspending and feeding means, a thread cutting mechanism comprising a stationary cutting blade, a movable cutting blade and devices for operating the same, all disposed at one side of the plane of travel of the fabric sections, a brush located above said fabric sections and rotating about a horizontal axis, and means forintermittently rotating said brush in timing with the operation of the movable cutting blade for placing enchained thread loops between the cutting blades while said blades are separated.

2. A sewing machine including in combination work suspending and feeding means, a thread cutting mechanism comprising a stationary cutting blade and a movable cutting blade, a spring for moving said blade for severing the enchained threads placed between the cutting blades, a rotating device for separating the cutting blades, a brush rotating about a horizontal axis and located above the travel of the fabric sections, and means for intermittently rotating the brush operated by the movable cutting blade and timed so as to place the enchained thread loops between the cutting blades while they are separated.

In testimony whereof I have hereunto set my hand on this 24th day of September A. D.,

PAUL D. REDCAY.

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