Патент USA US2407579код для вставки
SePt- 10, 1946- M. SCHREIBER EI‘AL - THREAD CUTTER 2,407,578 ' ‘ ‘I ' Filed July 3, 1945 J2?! ' if 31244.14!!!“ . ' fa TTTTTTTTTT! INVENTORS /Vnx 52%95/55? 2,407,578 Patented Sept. 10, 1946 f . UNITED‘ STATES PATENT ‘OFFICE THREAD CUTTER Max Schreiber, Philadelphia, Pa., and Alphonso _ Stebbins, Delanco, ,J., assignors to ‘Century Mills, Riverside, .N. J ., a partnership Application July 3, 1945, Serial No. 602,990 4 Claims. (Cl. luv-i252) 1 The invention here described relates to thread cutters for sewing machines. Objects of the invention are to provide a cutter which will save thread by enabling cutting of the thread close to the needle, which can be used to cut the upper as well as the lower thread and which while located in a handy position, ac cessible for instant use,‘ will be so guarded and A screw l3, set in ‘the inner, solid portion of the lug I0 and extending out to the slot l I, com pletes the clamp structure. The cutter proper consists of a thin ?at blade M. This may be the edge section of an ordinary safety razor blade. The guard for the blade is made up, in the present disclosure, of a strip of sheet metal folded on itself to provide blade enclosing sides l5 con protected as to be entirely safe for the operator. Other objects are to provide a cutter with these 10 nected by an integral fold l6 and the latter hav ing notches ll therein exposing portions of the advantages, in a renewable blade form of con edge of the blade. struction, in which old blades can be easily taken The single clamp screw 13 holds the guard and out and be replaced by new blades. enclosed blade ?rmly in place and the loosening Further objects of the invention are to pro vide a thread cutter of the character indicated 15 of this one screw enables the guard and blade to be quickly removed, when that is desired, as which can be readily applied to sewing machines for replacement of blades. . at low cost and which will not at all hinder or be The downward and inward inclination. of the in the way of the usual operations. . blade facilitates engagement of the threads Other desirable objects and the novel features by which the purposes of the invention are at 20 therewith and provides for a shearing type of cut enabling the threads to be quickly severed ‘ tained will appear or are de?nitely set forth in the following speci?cation. The drawing accompanying and forming part with the slightest effort. ‘ , The narrowing of the bed plate inwardly to ward the needle and the location of the cutter of the speci?cation illustrates one preferred em bodiment of the invention. Structure, however, 25 in this narrowed portion, inclined inwardly to ward the needle, enables the thread to be cut may be modi?ed and changed as regards this at the shortest practicable length, thus avoiding illustration, all within the true intent and broad scope of the invention as hereinafter de?ned and claimed. _ . wastage of thread. The saving of thread accom plished in this way is a very material item in com Fig. 1 in the drawing is a plan view of the in 30 mercial sewing machine operations. Also, it will be clear that the disposition of vention; as incorporated in‘the bed plate of an the cutter as shown enables the u-pper'as well as overcasting or overedging sewing machine. the lower thread to be cut. This avoids the hand Fig. 2 is a. side elevation; . Fig. 3 is a cross sectional view as on substan clipping operation usually necessary with ma 35 chines of the type illustrated, saving time and labor. In the illustration the invention is shown as tialy the plane of lines 3--3 of Fig. 1. incorporated in a machine of the overcasting or overedging type having a, bed plate or work sup While, as here disclosed, the invention may be incorporated directly in the bed plate of a con ventional sewing machine, such as in the bed port which is inclined from the outer portion 5 downwardly at 6 toward the lower rearward por 40 plate of an overcasting or overedging machine illustrated, by narrowing in the plate toward the ‘ tion ‘I. This plate, however, as shown partic needle and by mounting the cutter clamp in such ularly in Fig. 1, differs from the usual construc narrowed portion, all as illustrated, it is con tion in that it is narrowed inwardly in the in templated that special bed plates may be made clined portion at 8 toward the needle center in 45 up carrying the thread cutter, ready to go on the dicated approximately at 9. machine, in place of the conventional bed plate. At the underside of the narrowed and down-' The removal and replacement of this bed, plate wardly inclined portion the plate is provided is well understood. In the particular construc with a similarly downwardly inclined‘ clamp tion here illustrated the bed plate is held on the shown in the form of a lug or enlargement 10 at the underside of the plate and provided with 50 machine by a single screw passing through the opening shown in the rearward portion l of the an upwardly open slot or groove l I approximately plate, Fig. 1. Thus, upon removal of this single in line with the edge of the plate. The plate screw the ordinary bed plate may be taken off at this point is shown as having a straight edge and either reconstructed as described to incor portion l2 inclined inwardly, as seen in Fig. 1, 55 porate the thread cutter, or a substitute bed toward the opposite or inner edge of the plate. 2,407,578 , 3 plate carrying the thread cutter be applied to the machine in place of the regular bed plate. ' What is claimed is: l. A thread cutter comprising a folded guard having notches in the folded edge of the same, a blade enclosed in said folded guard with its edge exposed in said notches, a sewing machine bedplate havingijthe‘edge of’ the “same ‘out’ in‘ 4 3. A thread cutter for sewing machines com prising a sewing machine bedplate having a. clamp at that edge which is away from» the needle, a guard seated in said clamp, said guard having a folded upper edge exposed at the edge of the plate and provided with notches therein and a blade enclosed in said guard with its edge ‘ exposed'in'said'notchesg > e toward the‘needle center andta clamp for said 4'. A sewing machinevbedplatega clamp under guard located at said cut-in portion of said bed-l l0 neath said plate and having an upwardly open plate. ' ‘groove in line with the edge of the plate, a folded 2. A thread cutter comprising a folded guard I, .,,.guard seated in said groove with its folded edge having notches in the folded edge of the'same; upward and exposed at the edge of the plate, said a blade enclosed in said foldedguard with,‘ its; " guardj having notchesjn said folded upper edge, ‘ edge exposed in said notches;-.awsewingcmachineu bedplate having the edge of the same‘ cut in1to-, 7‘ fand-a- blade enclosed in said guard with its edge Y exposed‘ in said notches. ' ' ward the needle center and a Tolampforsaid ' guard located at said c'ut-in- portion 'of'said'bedi ' "1'. ‘I i ’ plate, said portion being downwardly ‘inclined and said clamp holding said guard and blade in downwardlyinclined relation. ‘ r ' MAX SCHREIBER. ALPHONSO STEBBINS.