US1941942A - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
US1941942A
US1941942A US623377A US62337732A US1941942A US 1941942 A US1941942 A US 1941942A US 623377 A US623377 A US 623377A US 62337732 A US62337732 A US 62337732A US 1941942 A US1941942 A US 1941942A
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US
United States
Prior art keywords
thread
take
needle
machine
roll
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US623377A
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English (en)
Inventor
Keall Frank Bycroft
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
Priority claimed from GB2275331A external-priority patent/GB390842A/en
Application filed by United Shoe Machinery Corp filed Critical United Shoe Machinery Corp
Application granted granted Critical
Publication of US1941942A publication Critical patent/US1941942A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B15/00—Machines for sewing leather goods
    • D05B15/02—Shoe sewing machines
    • D05B15/04—Shoe sewing machines for lock-stitch work

Definitions

  • the present invention embodies in a hooked needle sewing machine a novel and smoothly ruiming thread takeup device which rotates constantly while the machine is running and which imparts necessary tension to the thread and operates to pay it out to the sewing instrumentalities and to draw it down on to the work evenly at the necessary times.
  • the present invention embodies in a hooked needle sewing machine novel rotary thread take-up means which engage the thread continually and have, during a stitch forming cycle, such orbital movement that the thread will be paid out to and withdrawn from the stitch forming instrumentalities in amounts which are substantially those required.
  • Fig. 1 shows, in front eleva-- tion, the form of take-up device mentioned as applied to an outsole stitching machine for boots and shoes
  • Fig. 2 is an elevation, from the right hand side of Fig. 1, showing certain details of the take-up device seen in that figure
  • Fig. 3 is a diagrammatic view showing the paths moved through by thread take-up rolls of the device seen in Figure 1 during a stitch forming and setting cycle.
  • a pair of horizontal rotary shafts In the illustrative form of rotary take-up device there is supported in a bracket 1 secured to the table 3 of a curved hooked needle outsole sewing machine of the kind disclosed in the patent to Ashworth aforesaid, a pair of horizontal rotary shafts.
  • One of these shafts, indicated at 5, (being a solid shaft) is mounted within the other, which is indicated at '7 (the latter being a tubular shaft) and the shaft '7 is driven at the same speed of rotation as the main shaft of the machine and in the opposite direction by a bevel gear 9 on its left hand end which meshes with a similar bevel gear 11 on the lower portion of a shaft 13 driven by gears 15 and 17 from the main shaft of the machine.
  • the inner shaft 5 is driven at twice that speed by a' smaller bevel gear 19 meshing with a bevel gear at the lower end of the shaft 13.
  • the two shafts 5 and 7 are arranged above the work table of the machine and extend from near the left hand side of the machine (when looked at from the front) to just beneath the work-supporting table 21 of the machine.
  • the outer tubular shaft '7 carries at its right hand end a disc 23 about five and a half inches in diameter which has a fixed stud 25 projecting axially from it near its periphery, which stud carries on its outer end a thread take-up roll 2'7.
  • a cam member, in the present instance, an eccentric 29 is rigidly secured to the front side of the disc 23 as seen in Figure 2.
  • the inner solid shaft 5 projects through the disc 23 and eccentric 29 and has a plate 31 (about four inches in length) on its right hand end, which plate lies close against the eccentric.
  • the said plate has a guideway 33 (see Figure 2) cut diametrically across it in which a slide 35 is received for sliding movement.
  • the slide has a pin 3'7 projecting through it near one end, the left hand end of said pin (as seen from the front of the machine) being received within a' bearing in an eccentric sleeve 39 embracing the eccentric 29 so as to be acted on by said eccentric.
  • the forward end of the pin projects beyond the right hand face ofthe slide 35 and has a thread take-up roll 41 on it which'is similar to the roll 2'7 on the disc 23, the two thread guiding rolls 2'7 and 41 lying in the same general plane perpendicular to the axis of the rotary shafts as seen in Figure l.
  • the inner shaft 5 rotates at twice the speed of the outer shaft '7 and, owing to the fact that the slide 35 which carries the thread guiding r011 41 is coupled to the eccentric sleeve 39, the thread take-up roll 41 is caused to travel, while the thread take-up roll 2'7 moves once around a circular path roughly five inches in diameter, in a continuous spiral-like path which approximates first of all to a complete circle of approximately two and a quarter inches in diameter and then, to a complete circle of approximately three and three eighths inches in diameter.
  • the thread take-up rolls cooperate for this purpose as followsz-At the beginning of a stitch forming cycle when the needle is raised above the work, the awl is ready to pierce the work and the looper isjust starting to move towards the needle, the thread take-up roll 2'7 on the larger disc 23 will be at the front side of the disc and a little above the horizontal position of its axis and will, when its carrying disc rotates, move downwardly.
  • the position is indicated at a in Figure 3.
  • the thread-take-up roll 41 will, at this time, be just rearwardly of its lowest point and will be slightly above the latter.
  • the position of this roll at this time is indicated at a in Figure 3.
  • the take-up device most, but not quite, the maximum length which can be controlled by the take-up device.
  • the portion of thread passing from the roll 41 to the roll 2'7 at this timev will make an angle with the thread passing from the take-up device to the thread guiding device 45 just below the sewing point of roughly ninety-five degrees.
  • the disc 23 After the main shaft of the machine has rotated through some few degrees from the position it occupies at the beginning of a stitch forming cycle the disc 23 will have rotated (in a counter-clockwise direction looked at from the right of the machine) through a corresponding number of degrees to carry its thread take-up roll 27 below the horizontal plane in which its axis lies. Simultaneously the thread take-up roll 41 will have rotated through twice the angle and will have been carried further upwardly (i. e. towards the underface of the work) away from its lowest point.
  • the awl 4'7 (see Fig. 1) completely pierces the work, feeds it towards the needle 49 and retires from the work, the needle descends and enters the hole formed in the work by the awl and con-' tinues to descend to its lowest point below the work.
  • the looper 51 continues a movement across the line of the needle stroke to lay the thread in the hook of the needle and the thread take-up rolls 2'7-and 41 continue to be carried around, by theirre spective carriers, the roll 41 moving angularly faster than the roll,2'7 and being moved diametric'allyof the plate 31 during rotation-of the latter by the eccentric 29 on the'diisc 23.
  • the needle reaches the bottom of its'stroke after the main shafts has rotated through about 130 degrees from the position it occupied at the commencement of the cycle and the looper 51 and thread finger 53 combine to pass the thread around it at that time, the thread being held with the requisite tautness by the cooperating movement of the thread guiding rolls. Thereafter the needle commences to rise, taking a loop of thread with it while the iooper dwells. As the needle rises, taking the loop of thread with it, the thread take-up rolls are brought closer together still as they rotate and approach nearer to the underside of the work, thus paying out thread as the needle rises.
  • the cooperating thread take-up rolls As the loop is lifted over the body of the shuttle, more and more thread-is paid out by the cooperating thread take-up rolls as they rise and approach each other (passing slightly beyond the positions indicated at e, e which they occupy when the main shaft has rotated through two hundred and forty degrees) until, when the loop of thread is at its highest point on'the shuttle, i. e., when the main shaft has rotated through about two hundred and eighty degrees, the two thread take-up rolls are as close together as they can be and are also at their highestv positions relatively to the thread guiding device 45.
  • the cooperating thread take-up rolls travel downwardly away from the work. and separate relatively rapidly (as indicated by the positions I, j, which they take up after the main shaft has rotated'through three hundred degrees) to draw the thread from over the bobbin down on to and to set the stitch in the work.
  • the thread take-up roll 2'7 on the disc 23 is carried-around once in a circle starting from and ending at the position shown at a in Fig. 3 just above the height of the shaft 5 and the thread take-up roll 41 will be caused by the rotation of the plate 31, and by the action of the eccentric 29, to which it is coupled, to travel from the position shown at a and at twice the angular speed of rotation of the thread takeup roll 2'7, in a curved path which describes first an approximate circle (indicated by the letters I), c, d in Figure 3) of less than half the diameter of the path of the thread take-up roll 27 and then an approximate circle (indicated by the letters a, f, a) of just over three fifths of that diameter.
  • Such an arrangement can be made to yield up thread for engagement by the needle, to pay it out for passing over the shuttle and to draw it down to set the stitch in the work in a manner closely approximating that which is theoretically necessary.
  • an auxiliary take-up device similar to that referred to at 173 in the specification of the patent to Ashworth but the timing of which is modified as desired may be provided to enable the rotary take-up device to setthe stitch in the work slightly earlier than it normally would in order to ensure that the stitch shall be completely set'before the awl enters the work on either side of the roll and having flaring ends 7 between which the thread enters easily and by which it is guided to the roll.
  • a hooked needle lockstitch shoe sewing machine having, in combination, stitch forming devices including a hooked needle, needle threading mechanism, a shuttle, and a take-up comprising a thread engaging member, a member mounted Y thread engaging member is mounted, and means for controlling said thread engaging member to cause it to move in a closed curved path and to approach and recede from the axis of the rotating member.
  • a hooked needle lockstitch shoe sewing machine having, in combination, stitch forming devices including a hooked needle, needle threading mechanism, a shuttle, and a take-up comprising athread engaging member, a rotating member upon which the thread engaging member is movably mounted. a second rotating member, and
  • a hooked needle lockstitch shoe sewing machine having, in combination, stitch forming devices including a hooked needle, needle threading mechanism, a shuttle, and a take-up comprising two thread engaging members, two rotating members upon which the thread engaging members are respectively mounted, and means for causing one 0! said thread eng i members to approach and recede from the other thread eng ing member as the two rotary members rotate.
  • a hooked needle lockstitch shoe sewing machine having, in combination, stitch forming devices including a hooked needle, needle threading mechanism, a shuttle, and a take-up comprising a thread engaging member, and means for. actuating and controlling said thread engaging member to cause it to move in a closed curved path comprising two rotary members rotating at diflerent speeds, and connections from said rotary members to the thread engaging member.
  • a hooked needle lockstitch shoe sewing machine having, in combination, stitch forming devices including a hooked needle, needle threading mechanism, a shuttle, and a take-up comprising two thread engaging members, two concentricrotary members on which said thread engaging members are respectively mounted, and means for rotating said rotary members at different speeds.
  • a hooked needle lockstitch shoe sewing machine having; in combination, stitch forming devices including a hooked needle, needle threading mechanism, a shuttle, and a take-up comprising two thread engaging members, two concentric rotary members onwhich said thread engaging members are respectively mounted, and means for rotating one of said rotary members at twice the speed of the other.
  • a hooked needle lockstitch shoe sewing machine having, in combination, stitch forming devices including a hooked needle, needle threading mechanism, a shuttle, and a take-up comprising two thread engaging members, two concentric rotary members on which said thread engaging members are respectively mounted, means for rotating one of said rotary members at twice the speed of the other, and-means for imparting an inward and outward radial movement to the thread engaging member on the higher speed rotating member during each rotation 01' the lower speed rotating member.
  • a hooked needle lockstitch shoe sewing machine having, in combination, stitch forming devices'including a hooked needle, needle threading mechanism, a shuttle, and a take-up comprising two concentric rotary members, means for rotating one of said rotary members at twice the speed or the other, a thread engaging member fixedly mounted on the lower speed rotating member, a radially movable slide carried by the higher speed rotary member, 'a thread engaging member mounted on said slide, and actuating connections between the slide and the lower speed rotary member for imparting a radial inward and outward movement to the slide during each rotation of the lower speed rotary member.
  • a hooked needle lockstitch shoe sewing machine having, in combination, stitch forming devices including. a hooked needle, needle threading mechanism, a shuttle, and a take-up comprising two thread engaging members mounted to move continuously in the same direction in different closed curved paths in constant engagement with the thread, and means for actuating and controlling said members to pull the needle loop from the shuttle and set the stitch and to give up thread in timed relation to the thread handling movements of the needle, shuttle, and needle threading mechanism.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US623377A 1931-08-12 1932-07-19 Sewing machine Expired - Lifetime US1941942A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2275331A GB390842A (en) 1931-08-12 1931-08-12 Improvements in or relating to sewing machines
GB3503731 1931-12-18

Publications (1)

Publication Number Publication Date
US1941942A true US1941942A (en) 1934-01-02

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Family Applications (2)

Application Number Title Priority Date Filing Date
US623377A Expired - Lifetime US1941942A (en) 1931-08-12 1932-07-19 Sewing machine
US623378A Expired - Lifetime US1941943A (en) 1931-08-12 1932-07-19 Sewing machine

Family Applications After (1)

Application Number Title Priority Date Filing Date
US623378A Expired - Lifetime US1941943A (en) 1931-08-12 1932-07-19 Sewing machine

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US (2) US1941942A (cs)
FR (1) FR741018A (cs)

Also Published As

Publication number Publication date
US1941943A (en) 1934-01-02
FR741018A (cs) 1933-02-04

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