Патент USA US2136288код для вставки
Nov. 8, ‘ 1938. F. EBERT 2,136,288 THROAT PLATE FOR SEWING MACHINES Filed Jan. 25, 1955 " 5 Sheets-Sheet 1 f/orrrey. NOV. 8, 1938. ‘ > F_ EBERT 2,136,288 THROAT PLATE FOR SEWING MACHINES Filed Jan. 25, 1935 ' 5 Sheets-Sheet 2 Afformey, Nov. 8, 1938. ‘ ' -. F. EB'ERT 2,136,288 THROAT PLATE FOR SEWING MACHINES‘ > Filed Jan. 25, 1935 ' 5 Sheets-Sheet 3 HI me“. 1mm ' 31 5% Nov. 8, ‘1938. F. EBERT 2,136,288 THROAT PLATE ‘FOR SEWING MACHINES Filed Jan. 23, 1-955 5 Sheets-‘Sheet 4 AWo/wey. Nov. s, 1938. " F. EBERT ‘ 2,136,288 THROAT PLATE FOR SEWING MACHINES Filed Jan. 25, 1935 4% 25 I. 5.Sheets-She‘et 5 2,136,288 Patented Nov. 8, 1938 4 UNITED STATES PATENT ()FFIQE 2,136,288 THROAT PLATE FOR SEWING MACHINES Fritz Ebert, Oberndorf-on-the-Neckar, Germany, assignor to Mauser-Werke A. G., Oberndorf on-the-Neckar, Germany, a joint-stock com pany of Germany Application January 23, 1935, Serial No. 3,168 In Germany January 29, 1934 3 Claims. The present invention relates to needle plates or throat-plates for sewing machines. The primary object of the invention is to pro . vide a throat-plate for sewing machines which 5' will satisfactorily guide the fabric portions to be united to the needles of the sewing machine whereby a seam having the combined fastening and seam covering stitchings may be effected. ; I; In accomplishing this latter, I provide a throat 10 plate with a resilient hem fold guide with a guide. tongue or portion and the latter having the necessary channel or opening therein to ac commodate the usual upper movable knife of the trimming mechanism of the sewing machine. 15 Compared with known devices of this kind, the present device has the essential advantage in that the guide portion with its lateral edge serves as a stop and does not extend above the ._ upperface of the throat-plate. The guide por (Cl. 112—-260) provided at the left hand guide member which also is ?xed to the throat-plate. By this lateral projection the ridge of the seam is vertically fold ed so that it may be covered in this position. In the accompanying drawings, forming part 5 of the speci?cation, some constructions of throat plates according to the invention are shown by way of example. In these drawings: Fig. 1 is a front elevation of a throat-plate, of Fig, 1, . Fig. 3 is a side view, looking from the left of Fig. 1, . Fig. 4. shows a plan view, 15 Fig. 4a is .a section on the line IVa;—-IVa of Fig. 4, Fig. 5 is a section on the line V—V of Fig. 4, if cross seams occur, the vertical space between Fig. 6 is a plan view, corresponding to Fig. 4, showing a modi?cation having aligned. stitch 20 holes. the right hand side of the throat-plate and the hem fold guide, provided at the left hand side, Fig‘. 6, 20 tion is, moreover, resiliently arranged, so that, . may be enlarged. ‘ The hem fold guide may be adjusted accord ing to the desired width of trimming and the thickness of the material to be handled. At two points the resilient hem fold guide is reduced in cross section or weakened, so that the long shank 30' alone as well as together-with the resilient guide tongue may yield upon pressure being applied thereto. , To prevent the formation of bunches and in . order to tension the scam, the tongue portion 35’ for the cover seam may be arranged in an ele vated position with regard to the remaining part of the throat-plate. A further feature of the invention consists in - that the correct width for piercing may always 40' be maintained. Fig. 6a is a section on the line VIa—VIa of Fig. '7 is a front elevation, showing a further . 2'5' For this purpose an adjustable guide member is provided at the right hand side .of the throat-plate by means of which the fabric is guided in such a manner that it will always be the invention, Fig. 7, Fig. 9 is a side view, looking from the left of Fig. 7, terially facilitating the withdrawing of the fab , Fig. 10a is a section on the line Xa—Xa of Fig. 10. ' _ . Fig. 11 is a section on the line XI—XI of Fig. 10, Fig. 12 is a front elevation of a third modi?ca- 35 tion of the throat-plate according to the inven tion, ' Fig. 13 is a side view, looking from the right of Fig. 12, Fig. 14 is a side view, looking from the left‘ of 40 Fig. 12, - Fig. 15 shows a plan view, ' Fig; 16 is a section on the line XVI-XVI'of Fig. 15, 50‘ ric from the cylinder. In a modi?cation of the throat-plate according to the invention in which the stitch hole for the middle needle is arranged in front, a projection, extending until in front of the stitch holes for 55‘ the needles producing the cover seam, is laterally 30 Fig. 10 shows a plan view, 45 be resiliently pivoted to the throat-plate. This guide member on the throat-plate provides the further advantage that a special stop at the presser foot may be disposed with thereby ma ‘ Fig. 8 is a side view, looking from the right of Fig. 15, correctly pierced. . modi?cation of the throat-plate according to 25 The guide member may also _ 10 Fig. 2 shows a side view, looking from the right Fig. 17 is a section on the line XVII-XVII of 45 Fig, 18 shows a detail plan view of the guide member, Fig. 19 is a section on the line XIX~XIX of, Fig. 18, 50 Fig. 20 is a front elevation of a still further modi?cation of the throat-plate according to the invention, Fig. 21 is a side view, looking from the right of‘ Fig, 20, 55‘ 2 10 n 2,136,288 Fig. Fig. 20,22 is a side view, looking from the left may be adjusted in a recess 5 of the throat-plate Fig. 23 is a plan view, Fig. 23a is a sectional view taken on line XX[IIa-~XXIIIa of Fig. 23 with the addition of the fabric portions in their relative position. means of a screw 6. I, whereupon it may be ?xed to the latter by The cross section of the fold guide part 2 is reduced at two points ‘I and 8, whereby not only resiliency of the long shank 2’, but also of the guide tongue 3, provided with the Fig. 23?) is a sectional view taken on line slot 4 for the passage of the upper knife (not XXIIIb—XXIIIb of Fig. 23 with the addition of the fabric portions in their relative position. shown) of the trimming mechanism, is obtained. Fig. 230 is a sectional view taken on line XXIIIc-XXIIIC of Fig. 23 with the addition of the fabric portions in their relative position. Fig. 23d is a sectional view taken on line XXIIId—XXIIId of Fig. 23 with the addition of 15 the fabric portions in their relative position. Fig. 24 is a section on the line XXIV~XXIV of Fig. 23, Fig. 25 is a section on the line XXV-XXV of Fig. 23, showing the connection of the throat 20 plate to the support, Fig. 26 is a detail side view of the guide mem ber and Fig. 27 shows a plan view of the guide member. Figures l-5 and 7-11 show constructions of a throat-plate for sewing machines on which the fastening or joining seam and the cover seam are produced separately, i. e., a throat-plate in which one of the stitch holes is arranged in front of the other stitch holes, and Fig. 6 shows a plan view, corresponding to that of Figures 4 and 10, of a throat-plate having all three stitch holes ar ranged in alignment or in the same direction, 1. e., a throat-plate for sewing machines on which the fastening or joining seam and the cover seam 35 are made simultaneously. The construction shown in Figures 1-5, inclu sive, is particularly adapted for thin fabrics, and the throat-plate l in this case is provided with a special resilient hem fold guide 2, having a 40 guide tongue 3 with a slot llthrough which may operate the upper knife (not shown) of a trim ming mechanism, particularly of the kind dis closed in Patent No. 2,044,275 of June 16, 1936. The body portion of the throat-plate con— 45 sists of a laterally extending rear end portion A preferably of an arcuate con?guration in order that it may be applied to the outer end of the usual carrier arm of the sewing machine and has the openings B formed therein for the reception In this way, fabrics having cross seams may con veniently be passed through the machine, with 10 out such cross seams forming an obstacle. An opening H is formed within the arm D and a simi lar opening I is formed between the arms C and D, both of which accommodate the usual feed dogs 15 of the sewing machine. An inclined guide l6, formed with the arm D has extending therethrough the stitch hole 9 for the needle of the trimming seam, has the effect, that the seam ridge, on the short way to the stitch holes I I and I2 for the needles of the cover seam, is folded and therefore during covering lies ?at. By this method it is, however, also possible to produce a single seam and for this purpose, the stitch hole for the needle connecting or joining 25 the two fabric edges is arranged as the middle hole of three or more parallel stitch holes I4, provided in one plane or in alignment with the other stitch holes (see Fig, 6). The two pieces or webs of fabric are thereby folded in exactly 30 the same manner. By means of the inclined guide l3 also provided in this case, the two pieces of the fabric are folded flat in front of the three stitch holes ill, arranged in a single plane or in alignment, and are, therefore, sewn together by 35. the three needles, not shown in the drawings, working in these three stitch holes. The construction shown in Figures 7-11, in elusive, is particularly adapted for thicker fabrics and also has all the advantages mentioned above. 4.0 The substantial difference between this modi?ca tion and that already described consists in this, that the tongue portion 55 for the cover seam is arranged in elevated position with regard to the remaining part of the throat-plate l, whereby the 45 effect of the inclined guide 16, provided for fold ing the seam ridge or the two parts of the fabric respectively, is particularly enhanced. The ad vantage obtained by this construction is, that 50 of screws or similar means for fastening the the seam may be stretched or tensioned, whereby 50 throat-plate to the carrier arm of the sewing ma chine. Formed with and extending from one edge of the rear end portion A are a pair of spaced parallel arms C and _D and the upper faces of 55 these arms lie substantially flush with that of the rear end portion A. The outer or free end of the arm D is provided with an openingE for the formation of bunches is prevented. The arrangements illustrated are suitable for the reception of a screw or similar means re quired for attaching the same to the carrier arm 60 of the sewing machine. The hem fold guide 2 consists of a plate having a relatively long shank 2’ which is seated within a recess formed within the upper face of the arm C whereby the upper 75 sewing machines provided with an overhanging arm and adapted for feeding in the upward direc tion of the arm. The advantages obtained with 55 such machines may, however, also be obtained with sewing machines provided with an overhang ing arm adapted for feeding in the downward direction of the arm or across the arm as well as for flat bed sewing machines. 60 According to the modi?cation shown in Figures 12-19, inclusive, a recess 56 is provided in the upper face of the outer extremity of the arm D of the throat-plate l in which a guide member l1 face of this guide plate will lie flush with that of the body portion of the throat-plate. Formed _ is arranged which may be ?xed by means of a 65 with the outer end of the shank 2’ and ext-ending screw I8. The guide member I‘! is adjustably at one side thereof is a guide tongue 3. This mounted, so that its guide edge l9 may be brought guide tongue being so suspended within the space into its correct position according to the material provided between the arms C and D establishes to be handled. As a result, correct piercing of the needles through the fabric is always war 70 between its outer longitudinal edge and the slop ing edge or face F of the arm D a channelway ranted. The guide member H is provided with an open through which is fed the hem portions of the pieces of fabric to be united. According to the ing 26 which registers with the opening E of the desired width of trimming and to the thickness arm D to accommodate an attaching screw, of the material to be handled, the guide part 2 whereas the arm C and the hem fold guide 2 may 2,136,288 have an aligning opening J' therein through which may extend a screw or other suitable means for 3. ing against‘ the throat-plate serves to limit the swinging movement of the stop» I1, thus main attaching'the same to the carrier arm of the sew taining at all times a certain width of passage. Fig; 23a shows .in'cross section the fabrics to According to the modi?cation shown in Figures be sewn together and the coacting parts in their in 20-27, inclusive, the guidemember I1 is resiliently relativepositions before the knives a and b have and pivotally connected to the throat-plate I. cut the edges of the fabric portion 0 and d. A. screw 2 I. serves; as pivot for. the guide member Figure 23b is ‘a cross sectional. view of the step I1 and simultaneously for attaching‘ the outer following that shown in 23a. and discloses the end of' the arm D of the throat-plate I and the 1 joining needle e operating in stitch 'hole~9, in 10 lower knife 22, as shown in dotted lines in Figure frontv of ‘the two covering needles f which pass 23,. ofthe trimming mechanism to the support through the stitch holes 32.‘ In this secondfstep, 23 of the carrier arm- of the sewing‘ machine. To the edges of the fabric portions 0 and'd‘are relieve the screw 21' from the action of the guide already cut and bent against one anotherto member I1, tending to lift-the same, the arm D obtain‘ the position required for joining the two of the throat-plate I and the guide member I‘! are fabric portions. Fig. .230 discloses the third step dove-tailed at 24. At this side of the guide wherein the joining seam g has been produced member IT, a slot 25 is provided in which en and the edges of the fabric portions 1: and d gages a spring 26, held by the head of a screw lie ?at in the position required for covering. It 21. A set screw 28, provided in the guide member can be seen from the foregoing steps that the 20 I‘I, bears against the throat-plate I and serves _ lefthand piece 0 of the fabric is, when fed into to limit the movement of the guide member I ‘I the machine, bent at an acute angle which pro in one direction against the action of the spring gressively decreases until the cover needles. ,f are 26 and to allow an exact adjustment of the desired reached. The righthand piece d of the fabric is width of piercing. Fig, 23d shows in cross sec fed into the machine at an obtuse angle which 25 tion the operation of the adjusting screw 28 progressively increases until the said covering whereby member I‘! can 'be adjusted relative to needles 1‘ are reached. The joining needle e, unit its supporting arm. As shown, adjusting screw 28 ing the two pieces 0 and d of the fabric and is mounted through a portion of the guide mem thereby forming the joining seam g; operates in ber I1 and by rotating said adjusting screw 28, front of the two covering needles I. it may be caused to bear against the arm of the As shown in Fig. 23, in operation a knife 22 throat-plate I. By this means, the pivotal move is adjustably mounted upon the arm of the ment of guide member I‘! can be adjusted in order throat-plate I which supports guide member II. that resilient spring 26 cannot move the end por This knife 22 is provided with an elongated slot tion of the guide member I‘! in a horizontal posi 35 whereby the usual screw passing through the 35 tion a distance greater than the said adjusting arm of the throat-plate I passes also through screw 28 will permit. A set screw 29 presses the said slot and by means of the tightening ac against the spring 26, so that the tension of the tion of the usual screw, the knife 22 can be moved latter and thereby the pressure against the guide in a horizontal direction whereby the cutting edge member I‘! may be controlled. The resilient ar- ‘ of the knife may be adjustable relative to the 40 rangement has the advantage, that the guide edge usual cutting blade a. Knife 22 is so shaped, I9 of the guide member I‘! yields as soon as a as is shown in Fig. 23, to permit it to be readily cross seam passes. A stop 30, ?xed to the left mounted under the arm of the throat-plate I hand side of the throat-plate I, carries a lateral without interfering with the movement of mem projection 3| which extends until in front of bers relative to said throat-plate I and yet the 45 the stitch holes 32 for the needles producing the cutting edge of blade 22 can readily coact with cover seam, and which serves to vertically fold knife a, whereby cloth 0 and d may be readily the ridge of the seam, so that the latter may be cut by the scissors-like action of the knives a covered in this position. In operation, the fabric and 22. portions are fed into the sewing machine in such Figures 12-19, inclusive, show a modification 50 a manner that the left hand fabric portion is of a throat-plate for a sewing machine, having placed in an acute angle along a hem fold guide the three stitch holes for the needles arranged 30 and the right hand fabric portion in an obtuse in a single plane or in alignment, while Figures angle along the guide member I ‘I. In this angular 20-30, inclusive, illustrate a construction of the position, both fabric portions are trimmed, where throat-plate for a sewing machine in which the 55 upon, they are fed towards the needle joining stitch hole for the middle needle is arranged in them together. Should cross seams occur, that front of the two lateral stitch holes. Of course, is to say, should by the thickening of the fabric the one modi?cation as well- as the other may be the passage become too small, then the guide used for both positions of the needles. edge I9 may resiliently move upwardly at two The invention is, moreover, not intended to be 60 points and the guide member I‘! may resiliently limited to the illustrated modi?cations of the ing machine. 20 25 30 40 45 (30 - » swing towards the right, thereby enlarging the passage. From the needle joining the two fabric portions the latter move, after the seam ridge has been placed vertically by the projection 3| to the covering needles. According to the nature of the fabric to be sewn, the hem fold guide 30 may be adjusted in a slot 5 and ?xed in the adjusted position by means of the screw 6. This adjust 70 ment serves the purpose of controlling the width at which piercing of the fabric is effected. The right hand portion of stop I‘! is resiliently mounted so as to yield on the occurrence of cross seams. The spring pressure may be regulated by means of the screw 29. A further screw 28 bear throat-plate for sewing machines adapted for feeding the fabric in the upward direction of the arm, but may also be employed in connection with 65 any kind of throat-plates. What I claim is: 1. A throat-plate for sewing machines com prising a body portion, a pair of arms formed with and extending from said body portion, said arms being arranged parallel to one another to 70 provide a feed channel therebetween and each having their upper faces lying in a plane flush with that of the upper face of said body portion, a hem fold guide member ?exibly connected to one of said arms, an adjustable guide member 75 4 2,136,288 connected to the other of said arms and the last mentioned arm having needle openings ar ranged therein. 2. A throat-plate mechanism for sewing ma v chines comprising an arcuate body portion ca pable of being ?xedly connected to the carrier arm of the sewing machine, a pair of spaced arms formed with said arcuate portion providing a guide channel therebetween, a hem fold guide 10 member resiliently supported upon one of said arms, the upper faces of said hem fold guide members and arms lying in a plane ?ush with that of the upper face of said arcuate body por tion, said throat-plate having needle openings formed therein and a tongue portion formed with the throat-plate about said needle openings ex— tending in an elevated position above that of the upper face of the throat-plate. 3. A throat-plate for sewing machines com prising a body portion, a pair of arms formed with and extending from said body portion, said arms being arranged parallel to one another to provide a feed channel therebetween and each having their upper faces lying in a plane flush with that of the upper face of said body portion, a hem fold guide member ?exibly connected to one of said arms, a guide member pivotally and resiliently mounted upon the other of said arms 10 in such a manner that said guide member may yield in a horizontal direction away from said feed channel and the last mentioned arm having needle openings arranged therein. 15 FRITZ EBERT.