US1825597A - Sewing machine for joining edge portions of fabric sections - Google Patents

Description

Sept. 29, 1931. K. MAIER ET AL 1,825,597

SEWING MACHINE FOR JOINING EDGE PORTIONS OF FABRIC SECTIONS Filed July as. 1927 a Sheets-Sheet 1 42 I i 1 i n I 434 I 45/1 15 /4 flyi P 1931 K. MAIER ET AL 1,825,597

SEWING MACHINE FOR JOINING EDGE PORTIONS OF FABRIC SECTIONS Filed July 26, 1927 8 Sheets-Sheet 2 Sept. 29, 1931. K. MA'IER ET AL 1,825,597

SEWING MACHINE FOR JOINING EDGE PORTIONS 0F FABRIC SECTIONS Filed July 26, 1927 s Sheets-Sheet s ffwwmm I J Sept. 1931. K. MAIER E'FAL 1,825,597

SEWING MACHINE FOR JOINING EDGE PORTIONS OF FABRIC SECTIONS Filed July 26, 1927 8 Sheets-Sheet 4 lqzi Sept. 29, 1931. K. MAIER ET AL 1,325,597

SEWING MACHINE FOR JOINING EDGE PORTIONS 0F FABRIC SECTIONS ed July 26, 1927 S SheetS-Sheet s Sept. 29, 1931. K. MAIER ET'AL 1,825,597

SEWING MACHINE FOR JOINING EDGE PORTIONS OF FABRIC SECTIONS Filed July 26, 1927 a Sheets-Sheet e I W n I, l IIIIIIIIIIIIAU/ VIII Sept. 29, 1931. v K. MA lE R ET AL 1 1,325,597

SEWING MACHINE FOR JOINING EDGE PQRTIONS OF FABRIC SECTIONS Filed ul 26, 1927 8 Sheets-Sheet 7' Sept. 29, 1931. MAIER ET AL 1,825,597

SEWING MACHINE FOR JOINING EDGE PORTIONS OF FABRIC SECTIONS Filed July 26, 1927 a Sheets-S heet a Patented Sept. 29, 193i.

UNETED STATES PATENT OFFICE KARL MAIER AND FRIEDRICH LUTZ, OF STUTTGART, GERMANY, ASSIGNORS TO UNION SPECIAL MACHINENFABRIK, G. M. B. H., STUTTGAR-T, GERMANY SEWING MACHINE FOR JOINING EDGE PORTIONS OF FABRIC SECTIONS Application filed July 26, 1927, Serial No. 208,471, and in Germany July 29, 1926.

The invention relates to new and useful improvements in blind stitch sewing machines, and more particularly to a blind stitch sewing machine wherein the entire stitch forming elements are supported above the material being stitched.

An object of the invention is to provide a machine of the above type with mechanism for trimming the edge portions of fabric which are to be united, joining said edge portions when placed face to face, and for subsequently joining the edge portions and covering the meeting edges by a blind stitch covering mechanism.

A further object of the invention is to provide a machine of the above type wherein the through and through stitches are formed by two needles, one of which is passed through the fabric portions, after which the other is passed through, and wherein both needles are passed through the fabric and retracted between the feeding intervals.

A further object of the invention is to provide a machine of the above type with a depressing stitch finger associated with the blind stitch covering mechanism for positioning the joined edge portions of the fabric sections at the time when the needle of the blind stitch covering mechanism is passing into and out of said fabric sections.

A further object of the invention is to provide a machine of the above type, wherein the entire stitching mechanism for forming the through and through and blind stitch covering stitches, is capable of adjustment bodily toward and away from the fabric support.

A still further object of the invention is to provide a machine of the above type with a tubular work supporting arm, off from the end of which the material is fed as it is being stitched.

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

In the drawings which show by way of illustration one embodiment of the invention Figure 1 is a side view ofa machine embodying the improvements;

Fig. 2 is an enlarged end view of the overhanging arm with the cover plate removed and certain of the parts in section;

Fig. 3 is a view in section longitudinally of the overhanging arm and showing the work supporting arm diagrammatically;

Fig. 4 is a horizontal sectional view through the forward end of the work supporting arm and above the supporting shaft for the needles and looper;

Fig. 5 is a sectional view on the line 55 of Fig. 4;

Fig. 6 is a detail showing in side elevation, the actuating means for one of the needles;

Fig. 7 is a detail showing in side view, the actuating mechanism for the other two needles;

Fig. 8 is a detail showing partly in section and partly in side elevation, the oscillating means for one of the loopers;

Fig. 9 is a similar detail, showing the oscillating means for the other looper;

Fig. 10 is a detail showing the means for raising and lowering the overseaming looper;

Fig. 11 is a view partly in plan and partly in section, showing the trimming devices, the needles, the loopers, the presser foot and the stitch finger;

Fig. 12 is a viewpartly in section and partly in plan, showing the supporting means for the links which cooperate with the eccentric straps in the oscillating and endwise movements of the looper shafts for 8 the loopers which cooperate with the needles forming the through and through stitches;

Fig. 13 is a detail showing the yoke and arm carried thereby which supports one of the needles for forming the through and through stitches, and the needles for forming the blind stitch covering stitches;

Fig. 14 is a transverse sectional view through the presser foot and the work supporting arm showing the adjustable under- Eeath support, the feed dog and the stitch nger;

Fig. 15 is a plan view of the throat plate or fabric supporting devices carried by the work supporting arm, the adjustable under support and the sections of the feed dogs;

Fig. 16 is a detail showing the fabric support on the work supporting arm in transverse section and the sections of the fabric being stitched thereon;

Fig. 17 is a perspective View showing the portion of the work supporting arm, the tubular fabric being stitched and the needles;

Fig. 18 is a plan View showing the joining of the two edge portions of the fabric by through and through stitches;

Fig. 19 is a side view of the parts shown in Fig. 18;

Fig. .20 is an enlarged diagrammatic view showing the interlocking thread loops in the through and through stitches;

Fig. 21 is a view partly in perspective and partly in section, showing a portion of the work support, the needle of the blind stitch covering mechanism with the parts positioned so that the needle does not pass through the joined edge portions of the fabric sections;

Fig. 22 is a plan view of a seam formed on the machine when adjusted as shown in Fig. 24 so that the needle of the blind stitch covering mechanism passes through the body portions of the fabric sections beneath tle stitches joining the edge portions there- 0 Fig. 23 is a view similar to Fig. 22, but showing the relation of the through and through stitches joining the edge portions and the blind stitch covering threads.

Fig. 24 is a view similar to Fig. 21, showing the machine adjusted so that the needle of the blind stitch covering mechanism passes through the body portions of the fabric sections beneath the stitches joining the edge portions thereof.

The invention is directed broadly to a machine for joining the edge portions of fabric sections, and more particularly the edge portions of a tubular fabric. The machlne includes a supporting frame on which is mounted a suspended work supporting arm. The feeding mechanism is located in this arm and arranged for feeding the material as it is stitched off from the end of the arm. The edge ortions to be joined are placed on the wor supporting arm and are guided along the same with their edges in juxta-position for trimming and uniting. The edge portions of the fabric sections to be joined are arranged in planes at an inclination to each other, and the meeting edge portions are upturned so that they are placed one flat against the other. These upturned edge portions are first trimmed and then the edge portions are united by through and through stitches. After the edge portions have been united, then the joined fabric sections are presented to a blind stitch covering mechanism wherein a needle passes into one fabric'section and out of the other, without passing through so as to show at the inner side of the tube. A looper cooperates with this needle and forms a loop which is interlocked with the needle thread loop, and which is laid across the joined edge portion for covering the same, and secured by the needle as it penetrates the fabric for its next stitch.

Before describing in detail the mechanism for accomplishing the above results, it is thought that possibly the machine will be better understood by a brief description of the seam for joining the edge portions of the fabric sectlons and the manner of making the same. Reference will be made to Figures 17 to 24, for this purpose. The fabric is indicated at F. The work support on which the fabric is placed for joining the edge portions thereof is indicated at 2 in Fig. 17. This work support is provided with supporting plates 108, one at each side of the work support, which are adjustably secured thereto by screws 107. This permits the plates to be raised and lowered slightly. Each plate has an inclined portion 98 which serves as a support for the edge portions of the fabric sections. The fabric sections are guided along the inclined portion 98 of the supporting plates with their edge portions 111 juxta-position. The edge portions are turned upwardlfy as indicated at 97 in Fig. 17, and placed ace to face with each other. As thus positioned, they are first fed to a trimming mechanism which trims the edges as indicated in this figure. They are next fed to a pair of needles indicated at 7 and 20 in said figure. These needles form through and through stitches which join theedge portions (placed face to face. They are next presente to a blind stitch covering mechanism which includes a needle 21. In Figures 18, 19 and 20, the through and through stitches are shown. The needle 20 has passed through the edge portions at 119 and formed a loop of thread 118. The feed of the material has taken place, and the fabric has come to a standstill ready for the next stitch formation. The needle 7 passes through the fabric sections forming the thread loop 121. The looper engages this thread loop and carries the same to a position where the needle 20 can enter the same. The needle v20 then passes through the loop and the edge portions of the fabric sections. The needle 7 is withdrawn after its 'loop was engaged by its cooperating looper. Another looper cooperating with the needle 20 engages this thread loop and holds the same. The feed of the fabric takes place, and then the needle 7 will enter the thread loop 123 which was held by the looper, cooperating with the needle 20. The needle 20 passed through the fabric at the point 122 and the needle 7 passed through After the fabric edges have been joined,

then the joined edge portions are forced downward as shown in Fig. 21, to a postion so that the. needle 21 may pass into the fabric section at the point 100 at one side of the joined edge portions, over the a top of the joined edge portions, then into covered by the flooper thread loops., This .t needle .21.

and out of the fabric sections at the point 100. The needle does not go through the fabric sections to the inner side of the tube, and therefore, forms a concealed or blind stitch. The needle 21 is provided with a thread '21. The feed of the fabric is-in the direction of the arrow (Fig. 22). The thread 21 is formed into a loop 21 and then a looper thread 21 is 'passed through the needle thread loop 21 and is carried over the joined edge portions and positioned so that the needle 21 in its next reciprocation will pass through this thread loop 21 before it enters theadjacent fabric section. Thus it is that the joined edge portions are forms a blind stitch covering for the" joined edge portions which does' not show on one face of the joined fabric sections, and which covers the meeting edges on the other face of thefabric sections. v

The needle for the blind stitch covering mechanism penetrates the fabric once for each feed stroke, and therefore, the distance between the punctures made in-the fabric by the needle .21 will be equal to the. combined distance between the needle punctures made in the fabric by the needles 7 and 20.

The edges of the plates 98 are spaced in the region of the operation of the needle 21 so that the joined edge portions may be forced downwardly beneath the path of the The extreme edges of the inclined portions 98 of the plates are spaced as indicated at 116. In Fig. 24, the joined edge portions are shown as not depressed beneath the path of the needle; otherwise, the seam will be the same.

With the above description of what is sought to be accomplished, the machine for accompishing the result will now be described in detail. The machine consists of a supporting standard 2 on which is mounted an overhanging arm 2.' Projecting outwardly from the overhanging arm 2 is a frame member 2 which is provided with a depending portion 2, and the work supporting arm 2. is mounted at the lower end of this depending rtion and is suspended thereby. The mac ine is of the same type as that shown inour co-pending application Serial. No. 208,472 filed of even date herewith, and. further description of the frame is not thought necessary. The free end of this work supporting arm 2 is provided with plates 108 having inclined portions 98 which have been referred to above. I,

These plates are provided with slots in which the sections of the feed dog operate.

As shown in-Fig. 15,-there' is a feed dog having sections 113 and 114.- There is also another feed dog having sections 112, 112.

This is a diagrammatic showingof a differential feeding mechanism which maybe used when stitching knitted fabrics. The feed dogs are carried by the usual feed bar and actuated by devices extending through the work supporting arm, the depending mem-' ber 2 and the frame member 2. The feeding mechanism forms no part of the present invention, and has not been shown in detail.

It may be of any desired construction. Co-

operating with the feed dogs is a presser foot 94. The presser foot 94 is provided with inclined foot portions 95,'the under faces of which are substantially parallel with the inclined portions 98, 98 of the work supporting arm. The presser foot is a presser bar, which'in turn is mounted in 95 carried by a shank93 which is carried by The usual means is provided for yieldingly holding the presser footin engagement 'with the material, and for raising the presser foot, when desired.

The needle 7 is carried a needle arm 8 which is formed integral with a yoke 9 which is provided with-sleeves 10, 10', and these sleeves 10, 10, are mounted on a stationary shaft 11. The yoke 9 is provided with an upstanding arm 12 which is formedv with a segmental slot 13. N block 14 engages said slot 13 and is freely movable therein. An eccentric strap 15 is pivotedto said block. This eccentric strap 15 carries a head 16 cooperating with an eccentric 6 on the'actuating shaft 5. The actuating shaft 5 is provided with a spiral gear 4 which meshes with a spiral gear 3 on the main actuating shaft 1. A link 17 is piv- 7 'oted at 18 to the eccentric strap 15, and is pivoted at 19 to a lug carried by the over hanging arm 2 of the machine. As the shaft 5 rotates, the eccentric 6 will move the eccentric strap 15 back and forth, and will also oscillate the same on its pivotal boinnection" 18 on fthelink 17. This will cause the block 14 to move upwardly in the slot 13. The slot 13 is so shaped that during the upward movements of the block 14 in said slot, through the rotation of the eccentric 6, the yoke 9 remains at a standstill, and no movement is imparted to the needle. On the downward movement, however, of the block 14, through the continued rotation of the eccentric 6, the yoke will be ,given a quick oscillation, causing the needle 7 to penetrate the fabric portions carrying its thread loop therethrough and to be retracted. A looper cooperating with this needle engages and holds the thread loop. The needles and 21 are both carried by an arm 31 which is formed integral with a yoke 32. The needles are clamped to this arm by suitable clamping screws 30, 30. The yoke 32 is provided with hearing sleeves which are mounted on the stationary shaft 11. The yoke is provided with an upwardly projecting arm 26 which in turn is formed with a segmental slot 25. The block 24 engages this slot 25 and moves freely therein. An eccentricstrap 23 is pivoted to the block 24. This eccentric strap cooperates with the eccentric 22 on the actuating shaft 5. A link 27 is pivoted at 28 to the eccentric strap 23 and is also pivoted at 29 to a lug carried by the overianging arm 2. The slot 25 is so shaped as to accomplish practically the same results in a movement of the yoke 32 as is accomplished in connection with the oscillation of the yoke 9. The eccentrics are so timed, however, that the yoke 9 will be vibrated to carry the needle through the material before the needle 20 penetrates the material, so that the loop of thread carried by the needle 7 may be positioned for the needle 20 to enter. Then the needle 20 passes quickly into and out of the fabric, and both needles stand at a dwell while the fabric is fed.

Cooperating with the needle 7 is a looper 44. The looper 44 is carried by a looper shaft 43. This looper shaft 43 is mounted in suitable bearings 45 in the overhanging arm so that the shaft may not only oscillate, but move endwise therein. The shaft 43 is provided with a ball stud 42. An eccentric strap is provided with a head 41 which is connected to the ball stud 42. This eccentric strap is provided with a head 34 which cooperates with an eccentric 33 on the shaft 5. The eccentric strap 35 is pivoted at to a link 36. This link 36 is in turn pivoted at 37 to an arm 38. The arm 38 is formed as a part of a collar 39 which is mounted on the stationary shaft 11. As the eccentric 33 rotates, it will give to the eccentric strap 35 an endwise movement, and the link 36 will raise and lower the outer end of the eccentric strap, and this will cause the looper shaft 43 not only to oscillate, but move endwise, and thus impart to the looper 44 an elliptical path of movement. This is necessary for the reason that the looper engages the needle thread loop of the needle 7, and not only oscillates, but spreads the loop and positions said loop for the needle 20 to enter, without any feeding movement of the fabric.

Cooperating with the needle 20 is a looper 46. The looper 46 is carried by the looper shaft 52 mounted for free movement in bearings 53 carried by the overhanging arm. Said looper shaft is provided with a ball stud 51. An eccentric strap 49 is formed with a head which cooperates with the ball stud 5l. Said eccentric strap 49 is also provided with a head 48 which cooperates with an eccentric 47 on the actuating shaft 5. A link 54 is pivoted at 53 to the eccentric strap 49. It is also pivoted to an arm 55 formed integral with the arm 38. The eccentric strap 49, will, through the devices just described, oscillate the looper shaft 52 and move the looper shaft endwise, and this causes the looper 46 to engage the loop of thread formed by the needle 20 and position the same for the needle 7 to enter.

Before the fabric sections to be joined are rought to the position where the needles 7 and 20 form their stitches therein, the edge portionsare trimmed. This is accomplished by trimming blades 86 and 87. The trimming blade 86 is fixed to the presser foot 94, while the trimming blade 87 is a movable blade, and is'mounted on a movable arm 88.

This movable arm 88 is freely mounted on a bar 89 which is a part of the presser foot supporting mechanism. At the free end of the arm 83 is an upstanding member carrying a ball stud 90. A link 91 is connected to this ball stud and also to a ball stud 92 carried by a depending arm on the yoke 9 which carries the needle 7. As this yoke is oscillated, the link 91 Wlll cause the arm 88 to be vibrated, and this will move the trimming blade 87 back and forth in trimming relation with the trimming blade 86.

Cooperating with the needle 21 is a looper 56. The looper 56 is mounted at the lower end of a looper shaft 57. The looper shaft 57 is in turn mounted so as to oscillate and move endwise freely in a supporting sleeve 6 The looper shaft 57 is provided with a ball stud 62. An eccentric strap 60 is provided with a head 61 which engages the ball stud 62. This eccentric strap 60 is also provided with a head 59 which cooperates with an eccentric 58 on the shaft 5. Through this eccentric, the shaft 57 carrying the looper 56 is oscillated, and this will move the looper into and out of the needle thread loops. It is also necessary to raise and lower the looper, so that it may be carried over the meeting edges of the fabric sections to the other side thereof for positioning its thread loop for the needle to enter. This is accomplished by the mechanism shown in Fig. 10. Mounted on the stationary shaft 11 is a swinging frame 73. This frame 73 is provided with an arm 72 carrying a ball stud 71. The eccentric strap engages said ball Ill) stud, and also cooperates with an eccentric 69 on the shaft 5. Thus it is that the eccentric 69 will oscillate the frame 73. A link 76 is pivoted at 75 to the frame 73. This link 7 6 is in turn pivoted to a lever 7 9, which is pivoted at 77 to an arm formed integral with the upper section of the sleeve (33 in which the looper shaft is mounted. As the frame 73 vibrates, through the link 76, it will impart an oscillation to'the lever 79. A link 81 is pivoted at 80 to the lever 79, and is pivoted at 82 to a sleeve 83 located between spaced clamping collars S1 and 85 attached to the looper shaft. As the lever 79 is oscillated, through the link 81, it will raise and .lower the looper shaft, but the looper shaft is free to oscillate .in the sleeve 83.

Not only must the looper shaft be raised and lowered, but it must be shifted as to its position in order to carry the looper from one side of the meeting edges of the fabric sections to the other side thereof, and this is accomplished by the swinging of the sleeve in which the looper shaft is mounted. The sleeve 63 is mounted on a bearing member 64 which is carried by the stationary shaft 11. The sleeve 63 is'formed in two sections, and the ball stud 62 attached to the looper shaft is located between these sections. The two sleeves are joined by a connecting member 65. A ball stud 66 mounted on said member 6'5 is engaged by the eccentric strap 67 having a head 68 cooperating with an eccentric on the shaft 5. Through this eccentric, the sleeve 63 is oscillated on the stationary shaft 11 and this will swing the looper from one side of the seam to the other.

The shaft 11 is mounted in the overhanging arm so that it may be raised and lowered. At each end of the shaft is a recess 125. Pins 126 and 127 extend into the respective recesses. The construction and mounting of the pins are snnllar, and only one will be described in detail. The pin 120 is freely mounted in a bearing 128 formed in the overhanging arm. The pin is provided with an inclined face 130 which is adapted to engage an inclined face at the upper side of the recess 125. A spring 129 located beneath the pin normally holds the inclined faces in engagement with each other. The pin is moved endwisein its bearing by means of a collar 131 which has a threaded engagement with the pin. This collar carries screws 133, the inner ends of which are cone-shaped, and seat within an annular groove 134 formed in a projection 132 of the bearing 128 which supports the pins. By turning the collar, the pin with which it is associated may be moved endwise. The controlling mechanisms for the two pins are independent, but they may be (l5 nanipulated so as to properly raise and tion upon fabrics of different thicknesses.

The blind stitch covering mechanism per se, and the raising and lowering of the shaft on which it is supported, form no part of the present invention, except in combination with the other features described, but are shown, described and claimed in our c0- pending application referred to above.

The operation of the machine will be obvious from the detail description which has been given. The edge portions of the fabric which are'to be united to form a tube, are brought together at the upper face of the work supporting arm, which is tubular or cylindrical in general form. These edge portions are supported at an inclination to each other, with the contacting portions extending vertically and face to face. As so positioned, they are fed by the feed dogs and presented first to the trimming devices which trim the edge portions preparatory to stitching. They are next presented to the through and through stitching needles which join the upstanding edge portions. After the edge portions are joined, they are then presented to the blind stitch covering mechanism. The work support in rearof the through and through stitching needles, has a spaced portion so that the joined edge portions may be depressed into the same as clearly shown in Fig. 21. The presser foot 94 is provided with a depressing finger 109 which also serves as a stitch finger over which the covering loops of the blind stitching mechanism are laid. This depressing finger 109 is adjustably secured by means of a screw 110 to the shank 93 of the presser foot. Located within the work supporting arm 98 is a supporting member 103 carried by a post 105 which is capable of vertical adjustment by means of a screw 106. This support 103 extends into a slot 102 into which the joined edge portions are depressed by the depressing finger 109. After the edge portions are joined, they then pass beneath this depressing finger 109 which, when properly set, will depress the joined edge portions to a position beneath the path of reciprocation of the needle 21, as shown in Fig. 21. The depressed edge portions will be supported by the member 108 just described which can be adjusted as well as the adjustment of the depressing finger 109, so as to properly position the joined edge portions relative to the have provided a machine wherein the. edge portions of fabric sections while arranged face to face in a vertical plane are joined by through and through stitches, after which the joined edge portions are placed between the fabric sections and the fabric sections joined by a second stitch forming mechanism so as to completely house the raw edges of the joined edge portions and the stitches joining the same. This not only makes a very durable seam but one wherein the raw edges of the fabric sections may be concealed and a very neat seam produced. Furthermore, no stitching will appear on the right or face side of the seam.

\Vhile we have shown the invention as embodied in a machine for stitching tubular articles, it will be understood of course, that from certain aspects of the invention, the combined trimming, through and through stitching mechanism and blind stitch covering mechanism may be used in other types of machines. 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 in vention as set forth in the appended claims.

Having thus described the invention, what we claim as new and desire to secure by Letters Patent, is-

1. A sewing machine including in combi nation, a frame, a work support, a housing overhanging said work support, means for trimming the edge portions of the fabric placed face to face and arranged vertically, means mounted on said housing for 'oining said edge portions by through and t rough stitches, and means mounted in said housing for forming blind stitch covering stitches for the joined edge portions of the fabric sections.

2. A sewing machine including in combination, a frame, a suspended tubular work supporting arm carried by said frame, a ousing overhanging the free end of said arm, a presser foot, said presser foot and work supportin arm having means for guiding fabric sections with edge portions placed face to face and vertical, means for trimming the edge portions of the fabric, means carried by the housing for joining the edge portions by through and through stitches, and means carried by the housing for forming blind stitch covering stitches for the joined edge portions of the fabric sections.

3. A sewing machine including in combination, a frame, a tubular work supporting arm carried by said frame, a housing on said frame overhanging the free end of said arm, a presser foot, said presser foot and arm having cooperating inclined faces for supporting fabric sections at an inclination to each other, with the edge portions thereof face to face and vertical, means for trimming said edge portions, means for joining said vertical edge portions with through and through stitches, means for depressing the joined edge portions and blind stitching means for covering said depressed portions with stitches.

4. A sewing machine including in combination, a frame, a tubular work supporting arm carried by said frame, a housing on said frame overhanging the free end of said arm, a presser foot, said presser foot and arm having cooperating inclined faces for supporting fabric sections at an inclination to each other, with the edge portions thereof face to face and vertical, means for trimming said edge portions, means for joining said vertical edge portions with through and through stitches, means for depressing the joined edge portions and blind stitching means for covering said depressed portions with stitches, said means for forming through and through stitches and for depressing and covering the joined edge portions being mounted in said housing.

5. A sewing machine including in combination, a frame, a tubular work supporting arm carried by said frame, a housing on said frame overhanging the free end of said arm, a presser foot, said presser foot and arm having cooperating inclined faces for supporting fabric sections at an inclination to each other, with the edge portions thereof face to face and vertical, means for trimming said edge portions, means for joining said vertical edge portions with through and through stitches, means for depressing the joined edge portions and for covering the same with stitches, said means for forming through and through stitches and for depressingand covering the joined edge portions being mounted in said housing, and means for adjusting the position of the stitch formin members relative to the work supporting arm.

6. A sewing machine including in combination, a frame, a tubular work supporting arm carried by said frame, a housing on said frame overhanging the free end of said arm, a presser foot, said presser foot and arm having cooperating inclined faces for supporting fabric sections at an inclination to each other, with the edge portions thereof face to face and vertical, means for trimming said edge portions, means for joining said vertical edge portions with through and through stitches, means for depressing the joine edge portions and for covering the same with stitches, said means for forming through and through stitches and for depressing and covering the joined edge portions being mounted in said housing, and means for adjusting the fabric supporting members on the work supporting arm vertically.

7. A sewing machine including in combination, a frame, a tubular work supporting arm suspended from said frame, a housing carried by the frame and overhanging the arm, said arm having inclined fabric supporting plates vertically adjustable thereon and located beneath the housing, a presser foot having inclined portions cooperating with the fabric supporting plates on the arm, said presser foot and arm cooperating in supporting the fabric sections to be joined arranged at an angle to each other, with their edge portions face to face and arranged vertically, means for trimming said edgeportions, means for joining the edge portions, a depressing finger for depressing the joined edge portions, an adjustable support Within the arm for said depressed edge portions, and a blind stitch covering mechanism for joining the fabric sections and covering the depressed edge portions.

8. A sewing machine including in combination, a frame, a work support, a housing overhanging said work support, a presser foot, said work support and presser foot being shaped for guiding fabric sections with their edge portions upturned and face to face, means for joining said upturned edge portions including a needle disposed so as to enter said fabric sections from one side thereof, a looper cooperating with said needle, a second needle adapted to enter said fabric sections from the other side thereof, a looper cooperating with said second needle, said needles and loopers being timed so that the loop of the thread for the first needle is positioned for the second needle to enter the same during the feed interval, and the loop of the second needle is positioned for the first needle to enter during the next feed interval.

,9. A sewing machine including in combination, a frame, a work support, a presser foot, a housing carried by said frame and overhanging said work support, said presser foot and work support being shaped so as to guide fabric sections at an angle toeach other with their edge portions face to face and vertical, means associated with the presser foot for trimming said edge portions, a through and through stitching mechanism in rear of said trimming means for joining said edge portions, said through and through stitching mechanism including two needles located upon opposite sides of the fabric sections, a stationary shaft carried by the overhanging arm, a needle arm pivoted to said shaft and carrying one of said needles, and a needle arm pivoted to said shaft and carrying the other needle, mechanisms for vibrating said needles, and giving a dwell thereto when out of the material, said mechanism being timed so that first one needle enters the material and then the other,

and both needles are out of the material when at a dwell.

10, A sewing machine including in combination, a frame, a work support, a presser foot, a housing carried by said frame and overhanging said work support, said presser foot and work support being shaped so as to guide fabric sections at an angle to each other with their edge portions face to face and vertical, means associated with the presser foot for trimming said edge portions, a through and through stitching mechanism including two needles located upon opposite'sides of the fabric sections, a stationary shaft carried by the overhanging arm, a needle arm pivoted to said shaft and carrying one of said needles, and a needle arm pivoted to said shaft and carrying the other needle, mechanisms for vibrating said needles, and giving a dwell thereto when out of the material, said mechanisms being timed so that first.one needle enters the material and then the other, and both needles are out of the material when at a dwell, a looper associated with each needle, aloopcr shaft for each looper, and a mechanism for each shaft for oscillating and mov ing the same endwise, said mechanisms being timed so that the looper cooperating with the first needle will carry a loop of the thread of the first needle into position for the second needle to enter,

11. A sewing machine including in combination, a frame, a work support, a presser foot, a-housing carried by said frame and overhanging said work support, said presser foot and work support being shaped so as to guide fabric sections at an angle to each other with their edge portions face to face and vertical, means associated with the presser foot for trimming said edge portions, a through and through stitching mechanism in rear of said trimming means for joining said edge. portions, said through and through stitching mechanism including two needles located upon opposite sides of the fabric sections, a stationary shaft carried by the overhanging arm, a' needle arm pivoted on said shaft and carrying one of said needles, a needle arm pivoted on said shaft and carrying the other needle, mechanisms for vibrating said needles and giving a dwell thereto when out of the material, said mechanisms being timed so that first one needle enters the material and then the other, and both needles are out of the material when at a dwell, a looper associated with each needle, a looper shaft for each looper, a mechanism for each shaft for os cillating and moving thesame endwise, said mechanisms being timed so that the looper cooperating with the first needle will carry a loop of the thread of the first needle into position for the second needle to enter, and means whereby said stationary shaft may be raised and lowered for varying the position of said needles relative to the work support.

to support fabric sections to 12. A sewing machine including in combination, a frame, a work support carried thereby, a housing carried by the frame, and overhanging the work support, a presser foot mounted in said housing, said presser foot and work support bein shaped so as %e joined at an angle to each other with their edge portions face to face and vertical, means associated with the presser foot for trimming said edge portions, means for joining said edge por tions by through and through stitches including a needle, a lever arm for supporting said needle, an actuating shaft, an eccentric on said shaft, an eccentric strap, an upstanding arm attached to said lever arm carrying the needle and having a segmental slot therein, a block freely movable in said slot to which said eccentric strap is connected, a link pivoted to said eccentric strap intermediate its ends and serving as a swinging fulcrum for said eccentric strap, whereby said block is caused to move in said segmental slot without imparting movements to the lever arm carrying the needle during the movements of the eccentric strap in one direction, thereb giving to said needle a dwell, and whereby said strap, when moved in the opposite direction, will cause said block to move along the slot and quickly impart an oscillation to the needle into and out of the material.

' 13. A sewing machine including in combination, a frame, a work support carried thereby, a housing overhanging said frame, a presser foot mounted in said housing and cooperating with said work support, said work support and presser foot being shaped so as to support fabric sections at an angle to each other with their meeting edge portions face to face and vertical, a through and through stitch forming mechanism including a needle, a lever arm for supporting said needle, means for oscillating said lever arm,

a looper cooperating with said needle, a

looper shaft supporting said looper, an actuating shaft, an eccentric thereon, an eccentric strap cooperating with said eccentric and connected to said looper shaft for oscillating said looper shaft, and a link pivoted to said eccentric strap intermediate its ends and serving as a swinging fulcrum therefor, whereby said looper shaft is raised and lowered as it is oscillated.

14. A sewing machine including in combination, a frame, a work support carried thereby, a housing carried by the frame and overhanging the work support, a premer foot mounted in said housing, said presser foot and work support being shaped so as to support fabric sections at an inclination to each other with their meeting edge portions face to face and vertical, a trimming mechanism associated with said presser foot including a horizontal vibrating trimming blade, a through and through stitch forming mechanism including a needle, a stationary shaft in said housing, a yoke mounted on said shaft so as to swing thereon, means for swinging said yoke, a lever arm carried by said yoke and carrying said needle, a second arm carried by said yoke, a link connecting said second arm to said movable trimming blade for oscillating the same, and a looper cooperating with said needle.

15. A sewing machine including in combination, a frame, a work support carried thereby, a housing carried by the frame and overhanging the work support, a presser foot mounted in said housing, said presser foot and work support being shaped so as to support fabric sections at an inclination to each other with their meeting edge portions face to face and vertical, a trimming mechanism associated with said presser foot including a horizontal vibrating trimming blade, a through and through stitch forming mechanism including a needle, a sta tionary shaft in said housing, a yoke mounted on said shaft so as to swing thereon, means for swinging said yoke, a lever arm carried by said yoke and carrying said needle, a second arm carried by said yoke, a link connecting said second arm to said movable trimming blade for oscillating the same, a looper cooperating with said needle, a second needle on the opposite side of the fabric sections from the first needle, a sec- 0nd yoke on said stationary shaft, means for oscillating said second yoke, a lever arm carried by said second yoke and carrying said second needle, and a looper cooperating with said second needle, said loopers being timed whereby the loop formed in one needle thread is held for the other needle to enter.

16. A sewing machine including in combination a main frame, a work supporting arm suspended from said main frame, means for feeding the material being stitched oil from the end of said arm, an arm carried by said frame and overhanging the end of said work supporting arm, a stitch forming mechanism for forming through and through stitches through the edge portions of fabric sections on said work supporting arm for joining said ortions and stitch forming mechanism or forming blind stitches through said fabric sections and covering the joined edge portions.

17. A sewing machine including in combination a frame, a work supporting arm suspended therefrom, means for feeding the material being stitched off from the end of said arm, a housing carried by said frame and overhanging the free end of said arm, stitch forming mechanism mounted on said housing for joining the edge portions by through and through stitches, and stitch forming mechanism mounted on said housing for forming blind stitches for covering stitches and the stitching mechanism for forming the covering stitches, said fabric guiding means being adjustable whereby the relation of the covering stitches to the through and through stitches may be varied.

19. A sewing machine including in combination a tubular work supporting arm, a presser foot, a feeding mechanism for feeding fabric sections off from the end of said arm as they are stitched, means for supporting the fabric sections with the edge portions vplaced face to face and arranged vertically, stitch forming mechanism including a needle passing through the fabric sections in substantially a horizontal line, a second stitch forming mechanism including a needle passing through the fabric sections in substantiallyra"horizontal line and substantially parallel with the line of movement of the first named needle through said fabric sections, and means for depressing the joined edge portions and directing the fabric sections to said second stitch forming mechanism whereby stitches are passed through the fabric sections so as to enclose and housethe joined edge portions.

In testimony whereof, we afirourmgnatures.

KARL MAIER. FRIEDRICH LUTZ.

Images