US1917726A - Blind stitch sewing machine - Google Patents

Description

K. MAKER July 11, 1933.

BLIND STITCH SEWING MACHINE 3 Sheets-Sheet 1 Filed Oct 50, 1929 July 11, 1933. K. MAIER BLIND STITCH SEWING MACHINE Filed Oct. 30, 1929 3 Sheets-Sheet 2 Keg; M9152 M 11 1933, K NE 1,917,726

BLIND STITCH SEWING MACHINE Filed oci. so, 1929 s sheets-sheet 3 I MR4 Meme MMK ?atented daily 11, 1933 mran STATES PATENT OFFICE KARL MAIER OF STUTTGABT, GERMANY, ASSIGNOR T0 UNION SPECIAL MASCHI'NEN- v FAIBBIK, G. M. B. BL, OF STUTTGART, GERMANY BLIND srn'cn SEWING MACHINE Application filed October 30, 1929, Serial No. 403,475, and in Germany November 9, 1928.

The invention relates to new and useful improvements in sewing machines and more particularly to a sewing machine, that is adapted to form blind stitches.

An object of the invention is to provide a sewing machine with means for supporting and directing folded portions of fabric to a needle so that the needle will pass into and out of both folded portions on the same face thereof.

A further object of the invention is to provide a machine of the above character where'- in the folded fabric portions are independently supported so that the position of the folded portions relative to the needle may be varied. I i

A further object of the invention is to provide a machine of the above type wherein the supporting means for one of the folded fiabric portions may be moved away from the needle for the purpose of placing the fabric portion thereon.

A still further ob ect of the invention is to provide a machine of the above type wherein the supporting means for both of the folded fabric portions may be swung away provide a supporting and guiding means for folded fabric portions which includes means for forming a hem in one of said fabric portions and also means for directing the fabric section to the hem forming means.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

in the drawings Figure 1 is a front elevation of a machine having the invention applied thereto.

Fig. 2 is a detail on an enlarged scale showing the supporting means for one of the fabric supporting plates.

Fig. 3 is a sectional view on the of Fig. 2.

Fig. 4 is a view showing more or less diagrammatically in plan the needle, feed cups and the supporting devices for the folded fabric portions.

line 3-3 Fig. 5 is a perspective View of one of the supporting devices.

Fig. 6 is a perspective view of the other work supporting device.

Fig. 7 is a front view showing the fabric supporting devices with one of said devices broken away and one of the fabric sections in place in the guiding and folding device therefor.

Fig. 8 is a view of the fabric supporting means and fabric sections of Fig. 7 looking from the front of the machine.

Fig. 9 is a front view showing the other fabric supporting device with the fabric laid over the same and also the auxiliary support which cooperates therewith.

Fig. 10 is a view on the line .l010 of v Fig. 9.

Fig. 11 is an enlarged vertical sectional view through both of the fabric supporting devices with the folded fabric sections thereon ready for stitching.

Fig. 12 is a view showing diagrammatically a portion of a garment showing a. sewed on seat portion produced on the machine.

Fig-13 is a front view showing a slightly modified form of supporting means for the folded portions of the fabric.

Fig. 14 is a sectional view showing the hollow hem produced on the supporting devices shown in Fig. 13.

The invention is directed to a sewing machine which is provided with means for forming blind stitches in folded portions of a fabric. The machine used for this purpose is preferably of the cup feed type having a horizontally disposed needle and two feed wheels rotating about vertical axes which engage and feed the fabric to the needle. Associated with these feed wheels are fabric supporting devices which form the subject matter of the present invention. The machine is shown as provided with two fabric supporting devices over which the same fabric section may be folded at two different portions thereof or over which two different fabric sections may be folded. Each supporting device carries and directs a folded fabric portion to the needle for stitching the These supporting devices are preferably mounted so that they may be set at different heights and thereby the folded portions of the fabric sections are so directed to the needle that while the needle enters and emerges-from the same face of each folded portion of fabric the needle will not pass all 'the way through one of the folded fabric portions and will form therein blind stitches which do not show on the right face of the fabric. At the same time the other folded fabric portion is so positioned that the needle does pass all the way through and thus it is that the two fabric sections are firmly stitched together.

Both of the supporting devices for the folded portions of fabric are mounted so that they may be moved away from the stitching mechanism for the purpose of placing the material therein.

Referring more in detail to the drawings, the invention is shown as applied to a sewing machine consisting of a supporting frame 1 on which are mounted two feed wheels or cups 2, 2. These feed cups are so disposedas to rotate about vertical axes. The stitching mechanism is of a well known character in this type of machine and the needle only has been shown in the drawings. The needle is indicated at 3. The fabric to be stitched is directed to the stitching mechanism by devices which form and support two folds either in the same fabric section or in separate fabric sections.

In Figs. 1 to-12 the device is shown as operating upon two fabric sections. One of the fabric sections is indicated in the drawings at A and the other at B. The fabric section A is folded over a supporting device 4. This 40 folding device 4 is secured to a bracket 5 by means of screws 6, 6. vThe bracket 5 in turn is secured to a post 7 by means of a screw 8. The post 7 is mounted in a sleeve 9 rigidly secured to an arm 10 which is attached to the bed of the machine. This post 7 is provided with a notch 11. A pivoted latch 12 is carried by the sleeve 9. The latch is pivoted at 13 and a spring 14 normally tends to throw the nose of the latch 12 into the notch 11. A bell crank 15 is pivoted at 16 to the sleeve and this bell crank is provided with a forked end 17 which engages a pin 19 carried by the post 7 (see Fig. 3). A spring 20 normally tends to turn the bell crank so as to move the post 7 in a downward direction into the sleeve. A felt washer 20a is provided for receiving and cushioning the downward movement of the post.

When the latch 12 is released the post moves downward and carries the fabric supporting device 4: This moves the fabric supporting device 4 downward away from the stitching point and renders it accessible for the placing of the fabric section thereon.

The fabric section A, as clearly shown in reciprocating needle.

Fig. 11, is folded over this fabric supporting device 4 and can then be raised so as to place the folded portion of the fabric between the feed cups with the fabric extending sufficiently above the feed cup so that the needle will enter the folded portion and pass out of the same on the same face of the folded portion. This fabric supporting device is preferably so set that the needle does not pass all the way through the fabric section and the stitches formed are blind and will not show on the right face of the fabric section. This fabric supporting device 4, as clearly shownin Figs. 1 and 9, curves upwardly and thence extends substantially horizontally so as to direct the fabric section to the horizontally The curving of the section downwardly facilitates the handling of the material. The supporting device is also bent laterally as indicated at 4a.

In. order to give suflicient room for the manipulation of the other fabric section and the forming of a hem therein the delivery end of the fabric supporting device 4 lies in the plane of the body portion of this device.

Directly beneath the supporting device 4 is an additional fabric supporting member 21. This fabric supporting member 21 extends beyond the stitching point so as to support the fabric sections after they are stitched and to this end it is provided with an upwardly curved fabric supporting face 214. It also supports the fabric section A against lateral movement and thus aids in the directing of said fabric section, as clearly shown in Fig. 9, and may also be used to guide the fabric section B, as'shown in Fig. 8. This fabric supporting device 21 is carried by the bracket 5 and moves up and down therewith.

The fabric section B is folded over'a fabric supporting device 22. This fabric supporting device is shown in detail in Fig. 5. Said device consists of a bracket portion 23 having a laterally projecting part on which the supporting device 22 is mounted. The upper edge 22a of this fabric supporting device 22 is substantially horizontal. The lower part of the bracket member 23 is curved as'in- 'dicated at 24 to facilitate the turning in of the edge of the fabric section. There is also a laterally and downwardly projecting finger 25 which aids in directing the fabric section to this supporting member 22. This finger together with the supporting bracket 23 and the curved edge 24 forms a fold in the fabric section B and lays the same over the supporting member 22.

Mounted on the bracket portion 23 is a gauge finger 26. Said gauge finger lies against a bar 27 attached to the bracket member 23 and is held in set positions by a screw 28. This gauge finger is set so that when the edge of the fabric passes in contact therewith a proper fold will be made in the fabric ection B. The bracket member 23, as shown in Fig. 1, is fixed to a supporting plate 29. This plate is pivoted at 30 and can be swung to and from a vertical position. A latch 31 of well known construction is used for holding this plate 29 in a fixed depending position or in a raised position. Thus it is that the supporting device 22 with the parts associated therewith may be swung away from the stitching mechanism for loading or for other purposes.

The supporting bracket 23 is preferably so mounted that the fabric section B when folded over the same will be directed to the needle so that the needle which moves in a plane indicated bythe line 00-.r in Fig. 11 will pass into the fabric section B, through the fabric section, then into and through the folded portion of the fabric section A. The needle enters and emerges from the same face of the fabric section B, but passes all the way through the same. On the same stroke the needle enters and emerges from the same face of the fabric section A,- but does not pass all the way through the same.

In Fig. 12 of the drawings a garment is indicated at G to which a seat S is attached by stitching indicated at s. This is accomplished by the supporting and directing of the garment and the seat to be sewed on in the manner described in connection with the fabric sections A and B.

It will be understood, of course, that instead of having two fabric sections these folded portions may be formed in the same fabric section. The fold a will be formed in the body of the fabric section and the fold 7) will be formed at the edge of the body section and thus it is that a hollow hem can be produced such as shown in Fig. 14: of the drawings. it will be noted that the stitches which are indicated at s in this figure pass into and through the hem or folded book section or portion B and into and out of the fabric section A without passing all the way through, and therefore, the stitches are blind and will not show on the right face of the hollow hem formed. at the edge of the fabric section.

in Figs. 18 and 14 a slightly modified form of supporting means for the folded portions of the fabric has been shown. The supporting device 226 is carried by a bracket member 23a supported from above and means is provided for folding the edge of the fabric section B over this supporting member 225. Also attached to the bracket member 23a is the supporting device 4?; which supports and directs the fold a in the fabric portion A. This supporting device 46 extends downwardly and thence upwardly and is secured to the bracket member 2311 by screws 31, 31. This is just another manner of supporting the fabric sections so as to form the hollow hem shown in detail in Fig. 14.

my improved fabric supporting and guiding devices fabric sections may be Joined or hollow hems formed by stitches which do not show on the right face of the main fabric section.

It is obvious that minor changes in the details of construction and the arrangement of the parts may be made without departing from the spirit of the invention as set forth in the appended claims.

Having fully described my invention what I claim as new and desire to secure by Letters Patent is 1. A sewing machine including in combination a needle, means for independently supporting two portions of fabric each of which is folded back upon itself and for directing said folded port-ions to the needle, I

said supporting means ihcluding separate fabric supportingdevices positioned so that the needle passes into, all the way through and out of one folded portion and into and out of the other folded portion so that the needle threads formed therein are concealed from view on the right face of the fabric.

2. A sewing machine including in combination a needle movable horizontally, independent devices for supporting folded portions of fabric and directing the same to the needle, a supporting bracket on which one of said devices is mounted, a post to which said bracket is attached, a sleeve supporting the post, and a latch for holding said post in raised position with the fabric supporting device in operating position for directing the fabric to the needle.

3. A sewing machine including in combination a needle movable horizontally, in-

dependent devices for supporting folded portions of fabric and directing the same to the needle, a bracket supporting one of said devices, a post on which said bracket is mounted. a sleeve in which said post is mounted, spring means for normally forcing the post downward in said sleeve, and a latch for holding said post in raised position with the fabric supporting device in position for d1- recting thefabric to the needle.

i. A sewing machine including in combination a needle movable horizontally, independent devices for supporting folded portions of fabric and directing the same to the needle, means for supporting one of said devices whereby it may be raised and moved away from the needle to facilitate the inser tion of the fabric on said devices and means for supporting the other device whereby it may be lowered away from the needle to facilitate the insertion of the fabric thereon.

5. A sewing machine including in combination a needle movable horizontally, feed cups for supporting and feeding the material at the stitching point, independently mounted devices for supporting folded portions of.

fabric and directing the same to the needle and the feed cups, and a device adapted to support the stitched fabric sections after they pass the needle.-

6. A sewing machine including in combination a needle movable horizontally, feed cups for supporting and feeding the material at the stitching point, independently mounted devices for, supporting folded portions of fabric and directing the same to the needle and the feed cups, and a device adapted to support the stitched fabric sect-ions after they pass the needle, said last-named fabric supporting device extending beneath one of the first-named fabric supporting devices and serving as a guiding means for the fabric as it is directed along the supporting devices to the needle.

7. A sewing machine including in combination a needle movable horizontally, feed cups for supporting and feeding the material at the stitching point, means for forming a fold in a fabric section back from the edge thereof and for forming a hem at the edge portion of the fabric section and for directing said hem and fold in the fabric sec-. tion to the needle whereby said needle is caused to pass into, through and out of the folded back portion to form the hem and into and through the fold in the fabric section whereby a hollow hem is formed and secured to the fabric section by blind stitches.

8. A sewing machine including in combination a needle movable horizontally, de-

. vices for supporting folded portions of fabric and directing the same to said needle, a bracket member suspended above the nee dle, one of said devices being mounted on said bracket member, said bracket member having means for folding the edge portions over the fabric supporting device carried thereby.

9. A sewing machine including in combination a needle movable horizontally, devices for supporting folded portions of fabric and directing the same to said needle, a bracket member suspended above the needle, one of said devices being mounted on said bracket member, said bracket member having means for folding the edge portions over the fabric supporting device carried thereby, and an adjustable gauge finger carried by said bracket member for gauging the edge ,of the fabric as it is led to the folding member.

10. A sewing machine including in combination a needle movably horizontally, devices for supporting folded portions of fabric and directing the same to said needle, a bracket member suspended above the needle, one of said devices being mounted on said bracket member, said bracket member having means for folding-the edge portions over the fabric supporting device carried thereby, and means whereby said bracket member may be moved away from the needle to facilitate the placing of the material therein.

11. A sewing machine, including in combination a needle movable horizontally, independent devices for supporting portions of fabric, each portion of which is folded back upon itself, and directing the same to the ,needle, a supporting bracket on which one of said devices is mounted, a member to which said bracket is attached, and means for supporting said member whereby the same may be raised and lowered and held in a pre-determined raised position.

12. A sewing machine, including. in combination a needle movable horizontally, independent devices for supporting portions of fabric, each portion of which is folded back upon itself,'and directing the same to the needle, a supporting bracket on which one of said devices is mounted, a post to which said bracket is attached, a sleeve supporting said post and for permitting said post to be raised and lowered, and means for holding said post in a pre-determined raised position.

In testimony whereof, I afiix my signature.

KARL MAIER.

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