Sept. 10, 1946: J. NACHMAN 2,407,342 SEWING‘ MACHINE Filled Feb.- 25, 1944 fy 2 A 2.2 '9 _ a” 7J2 . ‘INVENTOR. 2,407,342 Patented Sept. 10, 1946 UNITED STATES PATENT OFFICE 2,407,342. SEWING MACHINE Joseph Nachman, Philadelphia, Pa. Application February 25, 1944, Serial No. 523,871 4 Claims. 1 (Cl. 112-219) 2 ent device that has been available heretofore which is directed to the‘ scrutinizing or inspect stitching machines. More particularly, it per ing of open-work type of stitching, as to its de tains to apparatus coordinated for functioning tailed‘ perfection and adapted to control the in connection with‘ sewing or stitching machines to examine or inspect the results of a stitching Cl functioning of the machine. It is an object of the present invention to ob operation. While the invention is of substantial viate such difficulties and uncertainties as here application, a primary embodiment thereof per inabove referred to, and particularly such as usu tains to apparatus for the production of open ally manifest themselves in the operation of a stitch work. exempli?ed by faggoting, which is sewing machine while producing open-work adapted to ascertain any defects of stitching as stitching or faggoting. they occur and to automatically control the op Another object of the invention is to provide eration of the machine under such circum a simple, rugged means adapted to inspect the stances, as by terminating the stitching opera stitching operation of a machine and to auto tion. matically‘ terminate said operation in the event It is well recognized that the operation of a of any imperfections manifested. sewing or stitching machine is not foolproof, and Still another object is to attain an effective de that difficulties may be frequently encountered vice for scanning open-work stitching immedi which manifest themselves in the form of de ately upon its production by an appropriate ma fective machine operation and by imperfection chine, and automatically adapted to stop the of the articles produced. In the case of open functioning of said machine where improperly work stitching or faggoting, this may be due to stitched work is produced. faulty functioning of the needle, thread break~ An additional object of the invention is to age, failure of thread supply, improper thread present an expedient attachment for a stitching or fabric feeding, et cetera. machine adapted to inspect or examine the per It is known to provide a sewing machine with fection of a faggoting operation, and to auto an attachment which may function to cut-off or matically cut off the machine in the event that stop the same where a metallic object, such as a any imperfections develop. metal fastener element, has not been properly It is a further object of the invention to de sewn to an electrically non-conducting support, vise an apparatus adapted for examining the such as a fabric. Thus, the metallic fastener results of an open-work stitching or faggoting element may be embraced in an electric circuit operation immediately as it issues from the zone which may become effective for terminating the of stitching, while simultaneously guiding the ar operation of the machine only in the situation ticle produced by the said faggoting operation. where the surface of the metallic fastener-ele Other objects, advantages, and features of the ment has not been properly insulated by thread invention will become apparent from the fol sewn thereover in the course of attaching the lowing description to be read in connection with same to a fabric or the like. Similarly devices the accompanying drawing in which similar ele have been contemplated for cutting-off a sew ments are designated by like numerals. ing machine from its normal course of operation Figure 1 is a fragmentary side elevation of the where the thread supply to the needle has be 40 stitching machine showing partly in section the come defective due to breakage or for any other inspecting or examining attachment in contact reason. However such devices are not adapted with the work of a faggoting operation. to function in the capacity of examining or in Figure 2 is a cross-section taken on line 2—2 specting the stitching characteristics as applied of Figure 1. to the work produced. Figure 3 comprises a partial front elevation of In general, the prior art devices designed for the device viewed in the direction of issue of the controlling the operation of the sewing machine have not been adapted to inspect open-work ?nished article. stitching, such as faggoting, during the course Figure 4 is a fragmentary detail, partly in sec of producing the same, and capable of directly tion, indicating the inspecting ?nger riding on the and automatically terminating the machine op faggoting stitches which serve to insulate said eration in the event of work discrepancies or im ?nger from contact with an electrical conduct perfections, without resort to any supplementary, ing plate for supporting the stitch work below the super?cially attached electrical conducting zone wherein said inspecting ?nger operates. means. In fact, there appears to be no expedi Figure 5 is a view similar to that shown in This invention relates to the art of sewing or 2,407,342 4 ‘ 3 Figure 4, but with the inspecting ?nger in con tact with said electrical conducting supporting plate through broken stitches of the open-work stitching, such as faggoting, thereby illustrat ing as a mechanical inspecting or examining de vice. As long as there is no break or imperfec ing the position of the ?nger in the event of an imperfection in the article produced. Figure 6 is a diagrammatic showing of an [4 by the intervening stitches, as indicated in Figures 1 and 4. In the event that a break or imperfection is tion in the stitching uniformity, inspecting ?nger ill will be prevented from contacting base plate electric circuit for Operating the stitching ma manifested by the open-work stitching, result chine, as well as automatically terminating its ing in a space or gap between stitches large action in the event of contact between the in 10 enough to permit the inspecting or examining specting ?nger and the electrically conductive ?nger IE! to pass through and contact conduct supporting plate. ing plate 14, the circuit of solenoid l8 shown Referring more particularly to the preferred in Figure 6 will be closed, provided manually embodiment of the invention as presented by the operated switch ‘.22 has been previously closed. various ?gures of the drawing, numeral 1 broadly 15 As the solenoid it becomes energized upon the indicates a sewing or sitching machine head to closing of the circuit within which it is em which a needle bar 2 is attached. Needle 3 is braced, it will attract magnetic switch 19, re is a?ixed to said needle bar 2 by means of a sulting in opening the circuit in which the sew screw element 4 in accordance with conventional ing machine motor is located. Accordingly, any practice, and is coordinated with foot 5 for per 20 undue gap in the stitching or faggoting opera forming- the stitching operation. Mounted on tion will cause an automatic break in the circuit foot 5 is a bracket ‘5, by a screw means 1, and determining the operation of the sewing machine, integral with the said bracket is a bifurcated thereby aliording opportunity for correction of arm 53. A point of rotation or pivot 9 may pro the dilhculty involved and permitting resumption. ject through appropriate openings in the afore 25 of the operation under desired conditions. said bifurcated arm of the bracket, and mounted As above indicated. by devising the examining for rotation thereon is the inspection or examin ?nger it of a dimension to embrace the stitching ing ?nger IE1 adapted for contact with the article between edges E3 of the tape, the said ?nger will 253 issuing from the Zone of the needle operation. function as a guide means as well as an exam Desirably, the contact of ?nger It with open 30 ining device adapted to control the operation of work stitching of 23 is facilitated by the action of the stitching machine motor. This is of material a spring means I2, which may be seated on pivot signi?cance in that it enables simpli?cation of the 9 as shown in Figures 1-3. A dotted showing II attachment by making possible the omission of is presented of the spring depressed ?nger Ill collateral guide means, and in addition permits of raised out of contact with article 23 against the a distinctly more efficient operation than hereto tension of spring means l2, where circumstances fore. dictate. The work tape forming the edges [3 of the As shown in the ?gures of the drawing, the dimension of the contact surface of the examin faggoting is supported on a frame or table I‘! ing ?nger may desirably embrace two consecu tive stitches 221i. Expediently, the dimension may which is of non-conducting material in accord ance with the usual design of stitching machines. Beneath the zone of contact of examining ?nger be such as to include two stitches along a median line drawn longitudinally of the article, i. e., par allel to the tape edges. However, it is not intend ed to be restricted to any particular dimension or ID, the article 23, subject to mechanical inspec tion, is supported by an electrical conducting plate l4, desirably metal. Elements l5, l6 desig ' design of inspecting ?nger, either taken as a nate electric wires comprising elements of the circuit shown in Figure 6. An electro-magnet or solenoid I8 is adapted to control magnetic switch l9 under predetermined conditions. The whole or with respect to its contact surface. are such as to prevent the ?nger means passing motor for operating the sewing machine is desig- _ nated as 2!}, while the source of direct current for the operation of the solenoid is indicated as 2|. A manually operated switch 22 is also em braced in the showing of Figure 6. In the operation of the apparatus, the parallel tape edges l3 are directed beneath the zone of operation of switching needle 3 where the open work stitching or faggoting is supplied to con nect the edges. From there, the ?nished article 23 is passed beneath the area of contact of the examining ?nger l0. Desirably as the completed article, such as faggoted tape 23, proceeds from contact with IE, it may be fed to a reel or similar means not shown which is adapted to maintain the tape under a reasonable degree of tension and in uniformly extended condition as the open work stitching operation proceeds. Where the onen~work stitching or faggoting is devoid of imperfections, examining ?nger Ill will ride thereover, desirably ?tting into the shallow groove or depression determined by the edges I3, will appear from Figure 3. It will thereby function as a guide means for the tape as it progresses through the stitching operation to be wound upon a distributing reel, while also serv It is merely requisite that the design and dimension through the interstices determined by the respec tive threads or stitches into contact with base plate It or its equivalent, except where a prede termined degree of imperfection or lack of uni formity, et cetera, is encountered. Thus exam ining ?nger It may be designed to embrace three or four stitches, and in some instances, merely one may su?ice. Similarly, its characteristics may be such as to detect a breakage or imperfection only where two consecutive stitches or an equivalent thread supply are involved. In brief, it is merely 60 essential that the ?nger be adapted to maintain contact with the stitches where no imperfection or lack of uniformity of a predetermined nature is apparent, and to make contact with conduct li’lg plate ll; immediately upon the passage there_ beneath of a predetermined extent of imperfec~ tion or lack of uniformity. While the invention has been described in con_ nection with open-stitch work as illustrated by faggoting, in which ?eld of application it is par ticularly effective, it is not intended to be re stricted to this adaptation. Thus, it may be applicable in the art of weaving or to other ?elds where the characteristics of the material contem plate distinct interstices or gaps between the 75 thread or ?bre determining its texture. 2,407,342 5 It will be apparent that a simple, effective ap paratus is provided for expediently scrutinizing positioned for making an electrical contact with the plate, the construction and operation being the characteristics of the work produced by a stitching machine, particularly in connection with such that upon passage of properly stitched ma terial, the ?nger is insulated from the plate, but upon passage of material in which stitching is defective, the ?nger shall move into engagement ables a control of machine operation, dependent with the plate thereby to close the circuit. upon the perfection or uniformity of the article 3. In a stitching machine, the combination of produced, not heretofore known in the open stitch a table, a presser foot and a needle operatively work art. While I have described my invention in accord 10 associated therewith, a source of power for the machine and means for cutting o? said source ance with desirable embodiments, it is obvious of power to stop the machine including a circuit that many changes and modi?cations may be having therein a solenoid, a, contact plate and made in the details of construction and in the the art of open~wori< stitching or the like. » t en~ a work engaging ?nger, said plate being posi combination and arrangement of parts, without departing from the spirit of the invention as de 15 tioned for supporting the stitched material as it issues from the needle and presser foot, the ?nger ?ned in the following claims. being operatively supported above the material Having thus described the invention, what is and positioned for making an electrical contact claimed as new and desired to be secured by with the plate, the construction and operation Letters Patent is: 1. In a stitching machine, the combination of 20 being such that upon passage of properly stitched material, the finger is insulated from the plate, a table, a presser foot and a needle operatively but upon passage of material in which stitching associated therewith, a source of power for the machine and means for cutting o? said source is defective, the ?nger shall move into engage of power to stop the machine including a circuit ment with the plate thereby to close the circuit, having therein a solenoid, a contact plate and a 25 said ?nger also being so formed at its fabric engaging end as to guide the stitched portion of work engaging ?nger, said plate being positioned the material. for contact with the stitched material at one side ‘A. In a stitching machine, the combination of thereof as it issues from the needle and presser foot, the ?nger being operatively supported at a table, a presser foot, and a needle operatively the other side of the material and so disposed as 30 associated therewith, a source of power for the machine and means for cutting off said source to make contact with and complete the circuit through the plate, the construction and opera of power to stop the machine including a circuit tion further being such that the said ?nger con having therein electrically responsive means, a tacts said plate only upon passage of an imper contact plate and a work engaging ?nger, said plate being positioned for contact with the iection in the stitched material. 2. In a stitching machine, the combination of stitched material at one side thereof as it issues a table, a presser foot and a needle operatively from the needle and presser foot, the ?nger being associated therewith, a source of power for the operatively supported at the other side of the machine and means for cutting off said source material and so disposed as to make contact of power to stop the machine including a circuit 40 with and complete the circuit through the plate, having therein a solenoid, a contact plate and a the construction and operation further being work engaging ?nger, said plate being positioned such that the said ?nger contacts said plate only for supporting the stitched material as it issues from the needle and presser foot, the ?nger being upon passage of an imperfection in the stitched operatively supported above the material and material. JOSEPH NACHMAN.