US1150123A - Lock-stitch sewing-machine. - Google Patents

Description

A. E. jERRAM. LOCK STITCH SEWING MACHlNE.

APPLICATION FILED MAY 21,1914.

Patented Aug. 17, 1915.

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LOCK STITCH SEWING MACHINE.

APPLICATION FILED MAY 21, I914.

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LOCK STITCH SEWING MACHINE.

APPLICATION FILED MAY 21, 1914.

Patented Aug. 17, 1915.

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LOCK STITCH SEWING MACHINE.

APPLICATION FILED MAY 21, 1914.-

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ARTHUR ERNEST JERRAM, 0F LEICESTER, ENGLAND, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, 0E PATERSQN, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

LOCK-STITCH SEWING-MACHINE.

Patented Aug. 17, 1915.

Application filed May 21, 1914. Serial No. 839,967.

T 0 all whom it may concern Be it known that I, ARTHUR E. JERRAM, a subject of the King of Great Britain, ref siding at Leicester, in the county of Leicester, England, have invented certain new and useful Improvements in Lock-Stitch Sewing-Machines, and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to sewing machines and particularly to lock stitch sewing machines wherein a rotatable horn is provid to support the work.

An object of this invention is to improve the construction and method of operation of such machines.

\Vith this object in view a feature of the invention contemplates the provision in a lockstitch sewing machine provided with a rotary horn of a shuttle support in the horn and .suitahlemechanism whereby the shuttle will be prevented from partaking of the rotary motion of the horn.

Preferably, the construction is such as to include means for driving the shuttle so arranged asto be unaflected by the turning movement of the horn and these latter means may be arranged to drive the shuttle when the latter is supported in the born to turn about an axis at an inclination to the axis about which the horn is-turned in its rotary movement.

\Vith the foregoing improvements means may also be provided to spread the loop of thread engaged by the shuttle.

The invention also relates to the particular construction and arrangement of the looper so that it will act in cooperation with the shuttle in forming the stitch, and according to another feature means for heating the parts engaged by the thread or wax. Preferably these means comprise conduits conveying heated fluid in close proximity to such parts and a device for 'circulating the fluid through such conduits.

These and other features of the invention A will be understood from the following description of the preferred embodiment of the invention taken in conjunction with the accompanying drawings.

the machine shown in Fig. 1; Fig. 3 is a plan showing in detail the support for the horn, Fig. 4 1s a vertical section through the tip or upper part of the horn with the 'parts in the position they occupy when the horn has been swung through ninety degrees from the position shown in Fig. 1, showing particularly the shuttle and the means by which it is supported and driven;

- Fig. 5 is a horizontal section through the part of the horn shown in Fig. 4; Fig. 6 is a view, with the constituent parts separated, of part of the chain of connections through which the shuttle is driven; and Fig. 7 is a view showing in detail a looper mounted in the upper part of the horn to cooperate with the shuttle in forming the stitches.

Like reference characters. indicate like parts in all the figures.

The machine in which the invention is described as embodied comprises a horn 2 carrying a shuttle box 4 at its tip within which box is situated a looper or spreader 6, a shuttle 8, shuttle spool and mechanism for operating these parts. The machine is also provided With a needle 10 and suitable mechanism for operating it. In order to understand the present invention, however, it is only necessary to describe the shuttle, the looper, and mechanism cooperating with these parts, it being understood that the other parts of the machine can be constructed and arranged in any suitable manner.

To enable the horn to be swung into different positions as is usual it is provided on its underside with. a hardened steel ring 16 which is secured to the horn in any convenient manner, as for example by screws 18. The underside of the ring 16 rests upon a series of balls carried in perforations in a washer'22, the underside of. the balls 20 resting on a hardened steel ring 24-situated in an annular recessed portion of the frame 26 of the machine. A similar perforatedwasher 28 carries the balls 30 that bear on the top of the ring 16, and bearing on the top of the balls 30 is a hardened steel ring 32 which is situated within an annular recessedportion in a cover plate 34 which is secured to the machine frame 26. The horn in the particular embodiment of the invention described, is limited in its turning movement to less'than the complete rotation by the provision of stops 86, but it is to be understood that it could'be arranged to turn completely around if desired and that the term rotary horn as used in this description and claims is to be understood as covering a horn that is partially or completely' rotatable. v

Secured in bearings in the machine frame 26 and extending upwardly into the lower portion of the horn 2 is a vertical shaft 38 driven from the main shaft 40 of the machine in any suitable manner, forexample by bevel gear wheels 42 44, for the purpose of driving the shuttle through operative connections hereinafter described. The shaft 38 carries another bevel wheel 46 which meshes with a bevel wheel 48 carried by a" shaft 50 supported in hearings in the inside of a lateral extension 52 of the horn 2.

To prevent endwise movement'of the ver-' tical shaft 38, and thereby keep the gears 42 44 and 46 48 in correct mesh, thevertical shaft 38is provided with a portion 54' which extends upwardly through a bearing 56 which is secured in the born 2 by a screw 58 which enters a groove in the bearing 56. A screw'60 isscrewed into the top of the portion ,54 of the shaft and bears on a washer 62 which rests, on the top of the bearing 56. v

The other end of the shaft 50 in the lateral extension 52 of the horn is provided with a gear wheel 64 which meshes with a gear wheel 66 carried bya shaft 68 su ported in bearings in a second extension Z 0 ofthe horn which extension is. at an acute angle to the lateral extension 52 and is situated above it. The other end of the shaft 68 is coupled by means of operative connections which' willbe described later to the shuttle 8. t g

The end, of the extension 70 constitutes the ti of the horn and as reviously 'lnentione carries the shuttle liox 4, see particularly Figs. 4 and 5, and the various parts situated Within the box. When the horn is turned, the shuttle 8 and shuttle box 4 would also be turned and the shuttle in consequence be moved out of correct operative position relatively to the needle 10 unless means were provided to counteract this movement of the shuttle and box due to the turning of the horn. As the shuttle 8 is arranged withits axis at an angle to the path of the needle, say, of about sixty degrees, the turning movement whichwould be imparted thereto would be a movement of the shuttle about its axis of rotation and a movement of the shuttle about the axis of the horn, which latter movement would cause the face of the shuttle to be moved into different planes. In order to counter act the latter movement as the horn is swung means are provided for moving the shuttle box 4 relatively to the horn 2, about an axis that is in alinement with the axis about which the horn turns, so that the shuttle box is held stationary and consequently the face of the shuttle remains always in the same plane. To carry this into" having a part cut away on its external e riphery so as to form an annular recess 4. Seated inthis recess is a hardened steel ring 76 which bears on the balls 78 of a ball washer 80, the balls of which in turn rest on a hardened steel ring 82 carried by the horn. To hold the ring 82 in place the top edge of its periphery is beveled as at 84 and against this beveled portion bear the taered ends of screws 86 which are screwed into the side of the horn.

In order to turn the shuttle box 4 and its appurtenances relatively to the horn as the latter is swung into different positions the underside of the shuttle box is provided with a beveled segmental gear 88 in mesh with which is a bevel wheel 90 carried by a shaft 100 which extends longitudinally of and is situated Within the extension 70 of the horn. The other end of the shaft 100 is provided with a beveled gear wheel 102 which meshes with a beveled gear wheel 104 carried by avertical shaft 106 mounted in hearings in the horn at that point where the extensions 52 and 70 join. A second beveled gear wheel 108 mounted on the shaft 106 meshes with a beveled wheel 1 10at one end of the shaft 112 which is mounted in bearingsand'extends withinthe lateral extension 52, the other end of the shaft 112 carrying a beveled wheel 114 which meshes with a beveled wheel 116 fixed to the frame of the machine and which surrounds the vertical shaft 38 which drives the shuttle throughoperative connections.

From the foregoing it will be understood that as the horn 2 is swung the fixed bevel gear 116 will cause a rotation of the gear wheel 114 and throughthe shaft 112, gear wheels 108, shaft 106, gear wheels 104 102, shaft 100, inion 90 and segmental rack 88 cause the shuttle box 4 to rotate relatively to the tip of thehorn in a direction reverse to the direction of rotati: .1 of the horn, so that the shuttle box w remain stationary in space.

It will of coursebe understood that the train of gearing is arranged of such ratio that the amount of relative movement between the horn and shuttle box will insure that the said box shall remain stationary in space or in its correct position with relation to the needle.

The method of mounting the shuttle and the means for driving the same will now be described, the said driving means being so arranged that movement of the shuttle about its axis-of rotation as the result of the horn being swung is prevented. The shuttle 8, which as previously mentioned rotates about an axis which is substantially at an angle of sixty degrees to the path of the needle, is on its inner side V-shaped with a flattened edge, as shown clearly in Fig. 6, and is mounted with its V-shaped side in a correspondingly shaped guideway in a collar 118 which is provided with a recess 120 for the passage of the needle and upper thread. For the purpose of driving the shuttle 8 it is provided with two recesses 122 in its back portion which are adapted to be engaged alternately by means of arms 124 carried by a rocking frame 126. This method of driving the shuttle by first one and then the other arm 124 of the rocking frame allows the thread to be looped over the shuttle.

The rocking frame 126 which is pivoted by pivots 128 in a ring 130, is carried in a guideway 132 formed in the interior of the shuttle box. Each of the arms 124 of the rocking frame 126 is caused to engage and be disengaged from the recesses 122 in the shuttle by means of a circular cam 134 which is held stationary in the interior of the shuttle box 4 by pins 136 engaging holes in projecting parts of the shuttle box, and which acts when the ring 130 is rotated on the faces of the arms 124 opposite to those which engage the recesses. The ring 130 is connected by universal joints comprising members 138140 and 142 with a rotary disk 144, the member 138 engaging a block 146 secured by arms 148 in the ring 130 while the member 142 engages a similar block secured to the ring 144. The rotary disk 144 is held in a guideway and is rotated in the operation of the machine by a bevel gear wheel 152 formed as part of it by another gear wheel 154 secured on the shaft 68. This shaft, as before mentioned, is situated in the second extension of the horn and is driven from the main shaft 40 of the machine through the gearing 66 64 48 46 42 44. The guideway in which the disk 144 is rotated is formed in the underside of the shuttle box I and the disk 144 is held in place by means of a ring 156 which bears against its underside and which is secured by screws 158.

carry with it the rocking frame 126 and the cam 134 by acting on the arms 124 of the same will cause them to engage alternately the recesses 122 in the back of the shuttle 8 and rotate the same and at the same time permit the thread to be passed over the shuttle.

The axis of rotation of the disk 144 is in alinement with the axis of rotation of'the horn so that any rotative movement of the disk 144 which might be imparted thereto as a result of the .rotative movement of the horn is counteracted owing to the fact that as the horn is moved and tends to turn the disk in one direction about the axis of rotation the driving connections to the disk will also, as a, result of the movement of the horn, tend to turn the disk 144 in the opposite direction and to an equal extent, it of course being understood that the driving mechanism is so arranged that the. amount of movement shall be equal and opposite. It will therefore be understood that the disk 144 remains stationary in space as the horn is moved and consequently, since the shuttle 8 is coupled to this disk, the shuttle 8. will also remain stationary. As previously mentioned, the machine is provided with a looper 6 which is adapted to engage the loop of needle thread'and de 'fiect it to one side into the path of the beak which is formed on the shuttle 8 as is usual. The looper 6 is mounted on a frame piece 160 having a sleeve 162 which is pivoted on a spindle 164 disposed across the shuttle box. Projecting from the frame piece 160 is a cam runner 166 which is engaged by a cam surface 168 formed on the ring 130 when the latter is rotated, as h'ereinbefore described. The looper arm 6 is provided with a projecting beak which, when the looper is allowedto rock on the spindle164 by the cam through the action of a spring plunger. 170, is adapted to engage the loop and as previously mentioned deflect it to one side. The spring plunger 170 is i iounted in a recess in the shuttle box and by acting on the frame piece 160 keeps the cam runner 166 in engagement with the cam 168 on the ring 130. v

The work is fed by the needlelO and just prior thereto the looper 6 is moved out of the path of the needle by the cam surface 168 to-permit the feeding of the Work by the needle. In order to prevent any possibility of breakage of the needle or other accident, the looper 6 is formed in two parts, as shown in Figs. 5 and 7, which are pivoted together by a pin 172 and which are normally held in alinement by means of a spring 17 4 so that inc 20 1 rotation passes through the said loop so that should the needle engage the looper on account of the looper not being moved out of the path of the needle by the cam, the said looper will yield in the direction in which the needle feeds.

The shuttle spool is carried in a casing which may, be prevented from rotating with the shuttle by any suitable or well known means. a

The shuttle box 4 is provided with a hole 176 at its top part through which passes the needle and the disposition of the needle and the driving mechanism for the shuttle is such that they are on thesame side of the shuttle. In the operation of the machine the needle having passed through the hole in the top of the shuttle box the loop of needle thread is engaged and deflected to one side by the looper 6 into the path of the beak on the shuttle 8. The shuttle 8 then in its first it is passed completely over the said shuttle. The shuttle then makes an idle revolution while the stitch-tightening operation takes place and while the work is being fed.

In order to heat the shuttle box-the extremity of the horn which conveniently is detachable is provided with a passage 178 extending around the horn. This passage is coupled at either end to two conduits 180 that pass inside and extend longitudinally of the extensions 52 and 70 of the horn. Theconduits 180 are connected at their base to a sleeve 182 mounted in the base of the horn which sleeve is concentric with. the

axis of rotation ofthe horn, and which sur= rounds the vertical shaft 38 by which the shuttle is driven as previously described. The sleeve 182 enters a cylindrical block 184 which is fixed to.the frame of the machine and which is provided with upper and lower annular grooves 186 which communicate with ports v188 in the .sleeve 182 which in turn register with ports in .the conduits 180. One of these annular grooves 186 is' connected to the source of heat which conveniently is oil pumped through a heating coil while the other annular groove 186 constitutes the outlet portwhich leads the-oil back to the supply. From the foregoing it will be understood that the oil circulates around the horn, it being pumped into one of the annular grooves and through one of the conduits 190 around the carrier attached to the shuttle box, and back through the other conduit to the annular groove leading to the outlet. It will be understood that with this -arrangen'lent when the horn' is swung into various positions the conduits 180 and'sleeve 182 will move as one and the ports in the sleeve 182 and conduits 1 80 will always be.

in communication with the supply of heated oil and the outlet on account of the annular grooves 186 in the block 184;. To catch any waste oil which may leak through the joint v not essential except so farjas specified in theclaims, and may be changed or modified without departing from the broader features of the invention.

The invention having been described, what is claimed is:

1. A lockstitch sewing machine, havingin combination, stitch forming devices including a needle and a shuttle, a shuttle support, a rotary horn in which the shuttle support is mounted, and means for preventing the shuttle support from partaking of the ro-T tary motion of the horn.

2. A lockstitch sewing machine, having in combination, a needle and a shuttle, a shuttle support, a'rotary horn in which the shuttle support is mounted, means for holding the shuttle support in fixed position with relation to the needle when the horn is rotated,

and driving connections for the shuttle arrafiged to be unaffected by the 'turning-move- -ment of the horn.

3. A lockstitch sewing machine, having i l C0mbinat1on, a needle, a rotary horn, a h ttle supportmounted in the horn, =a=-shutt1e mounted intthe support to turn about an.

axis at an inclination to the axis of the horn,

means for preventing the shuttle support from partaking of the rotary motion of the tle arranged to be'unafiected by the turning V movement of the horn.

4. A lockstitch sewing machine, havingin combination, stitch forming devices includ ing a needle and a shuttle, a rotary horn, a

shuttle support mounted in the horn to turn about an axis in alinement with the axis of v the horn, a gear on the shuttle support, -a-

.fixed gear concentric with the axis of the horn, and connections between said gears,

arranged to prevent movement of the shuttle support with relation to the needle whenthe I horn is rotated. I 1

5. A lockstitch sewing machine, having in combination, stitch forming devices includrotating the shuttle, a driving gear at .the base of the horn concentric with the axis of tions'between said gear and theshuttle for 105 horn, and driving connections for the shut- I the horn, and connections between said gears arranged to actuate the shuttle and to be unaffected by the turning movement of the horn.

6. A lockstitch sewing machine, having in combinati0n,'a needle, a rotary horn, a shuttle support mounted in the horn, a rotary shuttle mounted in the support to turn about an axis at an inclination to the axis of the horn, means for preventing the shuttle support from partaking of the rotary motion of the horn, a gear mounted in the shuttle support concentric with the axis of the horn, connections between said gear and the shuttle for rotating the shuttle, a gear at the base of the horn concentric with the axis of the horn, and connections between said gears arranged to actuate the shuttle and to be unaflected by the turning movement of the horn.

7. A lockstitch sewing machine, having in combination, a needle, a shuttle, a loop spreader, means for moving the loop spreader transversely to the path of the needle to present the loop to the shuttle, and means permitting a yielding movement of the loop spreader transversely to the path of the needle at right angles to its loop Spreading movement.

8. A lockstitch sewing machine, having in combination, stitch forming devices-including a needle, a shuttle and a loop spreader, a-rotary horn in which the shuttle and loop .spreader are mounted, means for actuating the shuttle and loop spreader, and means for maintaining the co-operative relationship of the loop spreader, needle and shuttle when the horn is rotated.

ARTHUR ERNEST JEtutAM. Witnesses:

FREDERICK WILLIAM WORTH, CECIL HERBERT Onoss.

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