US1214170A - Sewing-machine. - Google Patents

Description

1. KiEWICZ.

SEWING MACHINE.

APPLICATION FILED JULY16.1915.

Pateued Jan. 309 19N.

2 SHEETSSHEET I ra sie@ JOHN KIEWICZ, OF BOSTON, MASSACHUSETTS, SSIGNOR TO TH MASSACHUSETTS, A. CORPORATION OF MAINE.

MACHINE COMPANY, OF BOSTON,

REECE BUTTON HOLE SEWING-MACHINE.

Patented dan. 30, 191?.

appncation mea my 1s, 1915. serial No. 40,333.

- of that class which are provided with threadcutting and lclamping devices that operate nism, the end of the thread to hold the end of Athe needle thread while the initial stitches are being formed and then to cut said end close to the goods. In sewing machines which are provided with this thread-clamping and cutting mechawhich is cut after the first few stitches have been formed is apt to become entangled in the stitches as they are made and sewed to the goods, thus producing an imperfect product and necessitating the subsequent removal by hand of these severedends from the stitches.

It is the object of my invention to pro-v vide a novel mechanism for automatically removing the severed ends as soon as they are severed, thus obviating the possibility of said ends becoming sewed into the goods. The means I have herein illustrated for this purpose ispneu'matic means adapted to deliver a blast of air in a direction to blow the severed ends out of the way as soon as they are severed While my invention is applicable to any sewing machine having a thread-cutting and clamping means such as above described by which a severed end of thread is produced, I have chosen herein to illustrate it as it would be usedl in a sewing-machine having the thread-cutting and clamping devicesthat are illustrated and described in my co-pending application Se. No. 878,848, iled December 24, 1914.

InA the drawings, `Figure -1 is aside view showing the clamped end of the thread severed and in position to be removed by my improved device.

ving mechanism are 'sewing machine of the so-called type,

I have shown at 1 the frame of a sewing machine carrying stitch-forming mechanism which includes a needle 2 carried by a reciprocating needle bar 3 of usual construction.

4 indicates a driving shaft from which the stitch-forming mechanism isoperated by any suitable or usual connections.

`5 and 6 designate two clamping members between which` the work to be stitched is retained, the lower clamping member 5 being carried by suitable clamp plates 7 and the upper clamping member 6 being carried by pivotally-mounted arms 8. The clamping members 5 and 6 and the stitch-formconstructed to have a relative movement to provide for the necessary feeding movement of the work as the stitching proceeds and in the particular machine herein shown, which is a buttonhole Reece this feeding movement isderived from the main v.cam 9, shown in dotted lines in Fig. 1, hyp-mechanism which it is not necessary to herein describe in detail as it forms no part of the present invention. Said main cam is journaled inthe machine and is shown as operated from the driving shaft 4, this being herein accomplished by providing a worm wheel 10l that meshes with teeth formed on the periphery of the cam 9, and which in turn is actuated by a pawl carried in the oscillating pawl carrier 11 and coperating with the ratchet 12 fast with the gear 10. rI`he pawl-carrier 11 is connected by a link 13 with an elbow-lever 14 pivoted to the frame at'15 and actuated by a cam or eccentric -16 on the shaft 4. In-

asmuch .as the parts thus far described are f those found in the well-known Reece buttonhole sewing machine, it is not necessary to further illustrate them herein.

The machine herein shown is also pro vided with a thread-cutting and clampingl device similar to that shown in my co-pending application Se. No. 878,848, above referred to, and which comprises a relativelyfixed thread-clamping plate 20 carried by an arm 21 secured-to one of the arms 8 of the work-clamping device, `and a relativelymovable hook-shaped thread-holding mem-4 ber 22 carried by a lever 23 that is pivoted .at 24 to the Aarm 8. The device also comprises a thread-cutter 25 actuated by a lever 26 pivoted at 27 to the arm 8. Said levers plate 20. At.this4 time -menced again,

23 and 26 are actuated' at theA proper time 1 to yca use the hooked end thereof to engagethel needle thread -.t between the ralsed nee-t .I dle and the work 'and v is then moved later'- ally into the full line position Fig. 2, to clamp the thread between itself and the is actuated td cutIthe thread between the i thread clamp and the` w'ork, thus leaving the end of the' thread t leading from the needle clamped between the members 22 and 20.

' When the stitching operation is comthe end of the needle thread wilil remain clamped between the parts 22 an been` formed and the needle threadhas been firmly anchored' in the goods, at which time the `cutter 25 is given a thread-cutting movement thereby severingthe end t of the thread close to the work and at the same time the thread holder 22 is moved lbackwardly into the position shown in Fig. 3, thereby releasing the severed end j. rI`he mechanism as thus far described is or may be vall as shown in my said co-pending application. f When the end t of the needle thread is severed, as shown in Fig. 3, it drops onto the work and is very aptto be caught into the stitching being madevand thus stitched v tothe Work. This is undesirable as it results in an-imperfect product and necessiends t and tates the vremoval ends after pleted. j Y

I have .provided herein 'a novel mechanism by hand of these several the stitching operation is comfor automatically removingy these thread. which comprises a blower or pneumatic device constructed to deliver blasts of air in a direction to blow the ends t away as soon as they are severed and released by 'the thread-holding means. `While any suitable blower mechanism might-be employed for this purpose I have herein illustrated a'e device comprising a bellows which -is actuated from some moving part of the machineand which has a deliver pipe connected thereto'that terminates a jacent the thread-cuttin and clamping device. This bellows is s own at 34 and is herein illustrated as located within a cham-y ber 35 formed inthe frame 1 of the machine. The bellows is shown' asA secured to a removable ca'p 36 by which the upper end of the chamber 35 is closed, and said cap the thread cutter 25 2O until after the initial stitches havev has a port 37 therein communicating with the bellows which also communicates with an air delivery pipe 38, the end 39 of which is situated directly above the thread-clampin'g 'and cuttin device. This *pipe 38 is shown as secure, to the frame -1 by means of a clamping device 40. The bellows 35 may e operated in any herem shown a construction ywhereby it is operated from the rocking arm or lever 14 forming part of the means for actuating the main cam 9, and for this purpose the bel- .lows has depending tlierefrom a stem 4l which extends through the bottom of the. chamber 35 and is yconnected by 'a link 42` with the lever :.14 so that the oscillating movement of the lever 14 will expand and contract the bellows. This expanding and contracting movement vof the bellows will draw air in through the pipe 38 and then force air outJ through said pipe, thus producing a breathing ei'ect which will furnish suflicient blasts of air to effectively blow the thread ends t away as fast as 'they are severed. The chamber 35 is herein shown as providedwith a breather opening 47 so as to permit the bellowsv to be freely expanded or contracted without change of air pressure in the chamber. i

While I have herein illustrated my invenv'tion as applied to a buttonhole sewing machine of the yiReece type,

yet I -do not wish to be limite of the inven ion as it is applicableto other types of sewing machines that are provided with means for holding the end of the thread while the initial stitches are being to this particular application suitable way.'t I have I formed and then severing said end close to' the work.

It will be understood, of course, that various constructional the parts of the invention without departing therefrom. Y

I claim:

1. In a sewing machine, the combination with stitch-forming mechanism, of workclamping means, means to cause a relative movement between the stitch-forming mechanism and Work-clamping means. of means to hold the end of the thread while the initial changes may be made institches are being formed and then to cut said end, and pneumatic Hmeans actuated by the means for giving such relative movement between the work-clamping means and stitch-forming mechanism to remove said severed end.-

2. In a sewing machine, the combination with stitch-forming mechanism, of workclamping means, means to cause a relative movement between the stitch-forming mechanism and Work-clamping means, means to hold the end of a thread while the initial stitches are being formed and then to cut said thread, a bellows device, a pipe leading therefrom into position toA deliver an air Lamme blast onto the thread-holding and cutting means, and operating means for said bellows actuated by the means for giving the relative movement between the work-clamping means and.'stitchforming mechanism.

3. In a sewing machine, the combination with a frame having a chamber therein, of stitch-forming mechanism, means to hold the end of the thread while the initial stitches are being formed and then to cut said end, a bellows located in said chamber, a pipe leading from the bellows into position to deliver an air` blast against said threadholding and cutting means, and means to actuate the bellows.

4. In a sewing machine, the combination with stitch-forming mechanism, of workclamping means, meansincluding an oscillating lever'to cause a relative movement between said stitch-forming mechanism and work-clamping means, a bellows device connected to and operated by said lever, and a pipe communicating with isaid bellows and leading into a position to deliver air blasts against said thread-holding and cutting means.

In testimony whereof, I have signed my name to this specification.

` Jenn Kmwicz.

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