US1919410A - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
US1919410A
US1919410A US533096A US53309631A US1919410A US 1919410 A US1919410 A US 1919410A US 533096 A US533096 A US 533096A US 53309631 A US53309631 A US 53309631A US 1919410 A US1919410 A US 1919410A
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US
United States
Prior art keywords
cam
needle
speed
machine
sewing
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Expired - Lifetime
Application number
US533096A
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English (en)
Inventor
Bates Arthur
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
United Shoe Machinery Corp
Original Assignee
United Shoe Machinery Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United Shoe Machinery Corp filed Critical United Shoe Machinery Corp
Application granted granted Critical
Publication of US1919410A publication Critical patent/US1919410A/en
Anticipated expiration legal-status Critical
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B15/00—Machines for sewing leather goods

Definitions

  • UNITED srA'rssFPATeT was ARTHUR BATES, OF LEICESTER, ENGLAND, ASSIGNOR TD UNITED SHOE IEACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY snwrne MACHINE Application filed April 27, 1931, Serial No. 533,096, an in Great Britain May 6; 1930.
  • This invention is concerned with improve ments in or relating to sewing machines and is particularly, but by no means exclusively, concerned with sewing machines suitable for use in the manufacturing of boots and shoes.
  • shoes will hereinafter be used as including both boots and shoes.
  • Machines of the type just referred to are frequently used for example for sewing the inseams of welted shoes. It is desirable, in sewing machines generally, (in order to mini: mize the danger of breaking the thread) to reduce to a minimum the rendering of the thread through the needle which occurs as the needle retires from the work. Itis also desirable (particularly when sewing an inseam) to reduce the strain on the thread at this time to the minimum compatible with efficient sewing. lVhen sewing an inseam on a welted shoe, the strains on the thread are resisted principally by the between substance pro vided by the raised lip of the insole and as this between substance is sometimes soft or spongy it is liable to be out through or distorted by the thread if the strain on the latter is excessive. s i
  • a feature of the invention contemplates the provision in a hooked needle sewingmachine, ofmeans for changing the relation between the speed of rotation ofqthe cam shaft of the machine and the speed of dle, whereby, regardless of the speed at which the machine is operated in forming stitches, the needle may be retracted at such a speed as to avoid severe rendering or reeving of the thread through the needle or the application of an excessive tension to the thread.
  • this change of relationship may be effected in anysuitable manner upon a change in the speed of the cam shaft, but preferably this result is accomplished by means controlled bythe speed of the machine,
  • the object of the present invention is to i a centrifugally operable member may be provided arranged to vary the speed of operation of the needle actuating means.
  • a centrifugally operable member may be provided arranged to vary the speed of operation of the needle actuating means.
  • this centrifugally operable member takes the form of a radially IHOVRlTiiQ centrifugally controlled section of the rotary cam member from which the needle is actuated.
  • a curved hooked needle 1 is mounted in a carrier '3 which is mounted to oscillate about an axis 5 during the sewing operation in a manner well understood in the art.
  • the mechanism for oscillating the needle comprises a. curved link 7 pivoted atone end to the carrier 3 and at the other end to a blocl: 9 mounted in a slot at the end of lever 11.
  • a spring 13 urges the block 9 towards the top of "the said slot and provides a yielding device for the retraction of the needle from the work.
  • the lever 11 is freely mounted at its right hand end as seen in Figure 1 on a fixed rod 15 and has a web 17 extending upwardly therefrom which carries a cam roll 19 running in a track 21 cut in a cam member 23 fast on the main cam shaft of the machine.
  • the said track is so des gned as to give to the needle the necessary oscillating movements at the correct times in the cycle of operations of the machine.
  • Part of the said trackhowever (considered about the axis of the cam) is formed on two members situate side by side axially 'of the cam shaft, one of the members being part of the cam member itself and the other being a separate member which at certain times shrouds the former but may be withdrawn so that the cam roll may then run on said former member.
  • the said part of the cam track is that shorter part of the track lying between the points a and 1) shown on Figure 1.
  • the member which carries part of the cam track, and which may be withdrawn from a position in which it shrouds the other, is indicated at 25.
  • This member comprises an arm pivoted to the cam 23 (it being fasten a stud t1 hereinafter described) and having a cam face 29 cut on its inner face.
  • the member has nose 31 provided at its free end and the member is urged upwardly by a spring 33 (which bears at one end against the member and is received at its other end in a closed hole in the cam) so that the inner face of the nose bears against the outer face of a rib 37 formed on the cam member.
  • he arm 39 (see Figure 2) has riveted thereto the aforesaid stud 11 which projects through a bearing in the cam-member running axially of the i'atter.
  • the arm 25 has, on the side nearer the cam, a short sleeve 18 which extends into a cut-out portion surrounding the stud 41.
  • the said stud i1 passes through the sleeve 43 and to the outer face of the arm 25.
  • a washer -15 having a conicai hole centrally thereof is arranged against the outer face of the arm 25 and a conical headed screw passes through the washer and screws the arm to the stud 11.
  • a key at? is also provided to hold the arms 25 and 39 against relative rotation.
  • the other member of the two members aforesaid which also carries part of the track is as previously indicatedmerely one section of the main track itself i. e. that section which has formed upon it the cam face lyingbetween the points a and b and shown in dotted lines in Figure 1 at 49.
  • the cam roll 19 is of such a length as to extend across both the cam faces'2'9 and 49, as seen in Figure 3, the width of the cam face 29 (and of the cam face 49) being equal approximately to half of that ofthecam track 21.
  • the cam face 29 on the member 25 has a hump 51 provided on it and the top of this hump is, when the cam face is in itslimiting inward position, the highest part of the camtrack 21 (i. e. is nearerto the axis-of the cam than anyother part of the track).
  • the cam portion 49 has no hump but, after failing away from the point where the left hand end of the cam face 29 comes into alignment with the fixed cam track, rises gradually to the point 6 which point becomes the highest part of the cam track when the arm 25 is swung downwardly completely out ofshrouding position.
  • the needle will thereafter remain stationary for a short period until it is again advanced to the work by the cam roll reach ing a point in the cam track beyond the point 5. If the speed of the machine is allowed to increase however, the weighted arm 39 will fly outwardly about the axis of the stud 41 and will lower the arm 25 against the compression of the spring 33. Assume now that the machine be running at such a high speed that the cam face 29 on the member. 25 is com pletely withdrawn below the cam face49. In such a case after the needle has received its loop of thread the point x on the cam track will pass beneath the cam roll as before and the roll will commence to climb inwardly towards the point a.
  • the extent to which the arm 25 has been retracted from maximum shrouding position will determine how much of its cam face 29 projects beyond the cam face 49 and which part of the cam face 29 stands most proud of the cam face 49 and forms therefore the highest part of the cam track 21. It is clear therefore that if the machine starts at a low speed and gradually accelerates to a high speed the arm 25 will be swung more and more outwardly thus causing the highest effective part of the cam track 21 to move progressively along the cam track in a direction from the point a towards the point 6, the said highest effective point actually coinciding with the point 6 when the arm is fully retracted from shrouding position.
  • the increase in the length of that part of the cam track which retracts the needle is that gained only by flattening out in effect. the hump 51 until it reaches the point Z).
  • This arrangement is adequate be cause the part of the cam track m to a operates only to withdraw'the needle through the work and it is only after the barb of the needle has been withdrawn completely through the work that the needle commences to put substantial tension upon the thread.
  • the portion of the cam track it to a is therefore left fixed since no substantial gain will apparently arise from slowing down the needle movement during this early part of its retracting stroke.
  • the design of the cam track 21 is such and the lengths of the link 7 and lever 11 and the diameter and position of the cam roll 19 are so chosen that the part of needle withdraw-' ing stroke which is effected by machinespeed-controlled changes in position of the arm 25 is that part which continues to the fixed end position in the machine of the needle in its withdrawing stroke from approximately the time when the barb of the needle is withdrawing clear of the work.
  • variable needle actuating cam as is above described allows the machine to be run at a higher speed without breaking the thread than is possible when the machine has a needle actuating cam of usual type since where the variable needle actuating cam is'nsed the needle will be withdrawn from the work at a substantially slower speed than it otherwise would and the strain impart-ed to the thread by the withdrawal of the needle from the work will not be such as will be likely to break the thread.
  • needle actuating means including a mem her the eilective shape of which is adapted to be varied automatically on. a change in the speed or themachine to impart to the needle a different movement from that which it would otherwise have.
  • a hooked needle sewing machine having a rotary shaft,.needle actuating means the speed of operation of which normally bears a definite relation to the speed of rotation of said shaft and means arranged to be operated on a change in speed of rotation of said shaft to bring about a change in the relation between the speed of rotation of the said shaft and the speed of operation of the needle actuating means.
  • a hooked needle sewing machine having needle actuating means and a centrifugally operable member adapted to vary the speed elf-operation of the needle actuating means in accordance with the speed at which the machine runs.
  • a hooked needle sewing machine comprising needle actuating means including a rotary cam -m-e'mber and means ons'aid cam member adapted to change the effective shape of the cam as the speed of the machine varies.
  • a hooked needle sewing machine comprising needle actuating mechanism a member adapted to occupy a certain position when the machine is running at one speed but to occupy another position when the machineis running at another speed which member by movement from one position to the other is adapted to bring about a change in the speed of movement of the needle.
  • a curved hooked needle chainstitch sewing machine comprising needle actuating mechanism including means controlled by the speedcf the machine and acting upon an alteration in the speed of the machine to alter the speed of movement of theneedle at the latter part of its retracting stroke substantially less than the machine speed is altered whilemaintaining the angular time of the total needle cycle unchanged.
  • a hooked needle sewing machine con1- prising needle actuating means including a rotary cam member having a radially 1n0vable centrifugally operated section at the portion producing the retraction of the'needle.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US533096A 1930-05-06 1931-04-27 Sewing machine Expired - Lifetime US1919410A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13836/30A GB354314A (en) 1930-05-06 1930-05-06 Improvements in or relating to sewing machines

Publications (1)

Publication Number Publication Date
US1919410A true US1919410A (en) 1933-07-25

Family

ID=10030243

Family Applications (1)

Application Number Title Priority Date Filing Date
US533096A Expired - Lifetime US1919410A (en) 1930-05-06 1931-04-27 Sewing machine

Country Status (4)

Country Link
US (1) US1919410A (fr)
DE (1) DE565376C (fr)
FR (1) FR716559A (fr)
GB (1) GB354314A (fr)

Also Published As

Publication number Publication date
DE565376C (de) 1932-11-29
FR716559A (fr) 1931-12-23
GB354314A (en) 1931-08-06

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