US1941943A - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
US1941943A
US1941943A US623378A US62337832A US1941943A US 1941943 A US1941943 A US 1941943A US 623378 A US623378 A US 623378A US 62337832 A US62337832 A US 62337832A US 1941943 A US1941943 A US 1941943A
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US
United States
Prior art keywords
thread
take
needle
roll
machine
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
US623378A
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English (en)
Inventor
Keall Frank Bycroft
Elliott Harold Ernest
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 US1941943A publication Critical patent/US1941943A/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

  • This invention is concerned with improvemember which is mounted to move continuously 3 ments in or relating to sewing machines and is more particularly concerned with machines for sewing leather such, for instance, as are used in the boot and shoe industry for sewing shoe soles to shoes.
  • Such machines are usually provided with a curved hooked needle which cooperates with a curved awl and thread handling instrumentalities to sew the sole to the welt of the shoe by a lockstitch seam.
  • An example of such a machine is disclosed in the United States patent to Ashworth No. 1,169,909 dated February 1, 1916.
  • a hooked needle lockstitch shoe sewing machine of a rotary takeup device comprising a single thread engaging in constant engagement with the thread and which is'actuated at the necessary speed during a stitch forming cycle to pull the needle loop from the shuttle and set the stitch and give up thread in timed relation to the thread handling movements of the needle, shuttle, and needle threading mechanism.
  • a single thread take-up roll is secured eccentrically to a pinion which is 1'0- tated around the periphery of a second pinion which itself is oscillated to and fro about its axis at a relatively slow speed, the result of the com bined rotary and oscillating movements of the two pinions causing the take-up roll to move towards and away from the work at a varying speed in an orbital path so as to control the thread throughout the sitch forming cycle without undue slackness or tension.
  • FIG. 1 shows, in front elevation, a form of take-up device embodying the present invention as applied to an outsole'stitch'mg machine for boots and shoes;
  • Figure 2 is a view, from the right hand side of Figure 1, showing certain details of the take-up device seen in that figure;
  • Figure 3 is a view showing the path through which the thread take-up roll of the device moves during a stich forming and setting cycle.
  • This shaft 61 carries apinion 63 at its right hand end (looking at the machine from the front) and has a sleeve 65 surrounding it, which sleeve has .an elongated closed cajsing 67 secured to its right hand end to receive within it the pinion 63 on the shaft 61 and the casing houses a second pinion 69 secured to a pin '71 freely rotatable on ball hearings in the casing, which pinion is of the same size as the pinion 63 on the shaft 61 and meshes with this pinion.
  • the left hand end of the sleeve 65 has a gear wheel '73 secured to it, which gear wheel is coupled by a train of gears to the main shaft of the machine so that the sleeve is rotated once for every rotation of the main shaft and in the opposite direction to the latter, i. e., it rotates in an anti-clockwise direction looked at from the right, as seen in Fig. 2.
  • the pinion 69 has secured as a unit with it a disc '75 which is secured to the pin '71 of the pinion (which pin rotates with the pinion) and carries a thread take-up roll '77, the axis of which extends parallel to the axis of the pinion 69 and is so positioned eccentrically of the pinion that it lies more or less opposite the teeth of the pinion, as indicated in Fig. 2.
  • the shaft 61 on which the pinion 63 is secured has a short crank arm '79 secured to its left hand end (which projects beyond the sleeve 65) which arm is connected by a crank 81 with an eccentric pin 83 projecting from that gear wheel of the train of gears aforementioned which engages with the gear '73 on the left hand end of the sleeve 65.
  • the eccentricity of the eccentric pin 83 and the length of the short crank arm 81 are such that as the gear wheel carrying the eccentric pin 83 makes a complete rotation, the shaft 61 and therefore the pinion 63 at its right hand end oscillates to and fro relatively slowly through about seventy degrees.
  • the pinion 69 carrying the thread take-up roll '77 is carried bodily once around the pinion 53 on the shaft 61 and the shaft itself is oscillated once backwards and forwards at a slower speed than the speed of rotation of the pinion 69, thus giving an additional rotary movement to the pinion 69 about its own axis and causing the take-up roll '77 carried on it to travel at a continually varying speed, during each rotation of the main shaft of the machine, in a closed path indicated at X in Fig. 3 which is somewhat oval in shape and is nonsymmetrical about the axis of the shaft 61.
  • the thread passes upwardly and forwardly from thread locking devices and a thread measuring or pull off device which are similar in fimction to those described in the prior specification aforementioned, over a stationary guide roll indicated at 85 in Fig. 3, directly downwardly around the take-up roll '77, upwardly around a second stationary guide roll (not shown) and thence directly to the looper 51.
  • the rotary take-up device cooperates with the thread handling instrumentalities during the working of the machine as follows:-
  • the needle 49 will be raised nearly to the top of its stroke, the awl a? will be ready to pierce the work, th lcoper a]. will just have started to move towards the left ready to lay the thread in the barb of the needle when the needle descends the thread hook 53 and thread lifter 57 will lie away from contact with the thread.
  • the take-up roll 7'7 will be in the position shown at a in Fig. 3, i. e. nearly in its lowest position away from the work and will, in fact, have commenced to set the stitch previously formed within the work.
  • the take-up roll continues to move relatively slowly upwardly towards the work along this path (thus paying out thread relatively slowly to the looper) during the whole of the time that the needle pierces the work and descends to its lowest position and during the time that the looper and thread finger 53 cooperate to lay the thread in the hook or barb of the needle and retire after having effected this, during the time that the needle rises with the thread loop in its barb nearly to the top of its stroke and during the time that the thread lifter engages with the thread loop to hold it in a position to be easily engaged by the shuttle beak.
  • the loop of thread is lifted over the top of the shuttle and this calls for a rapid paying out of thread in order that the loop may be carried over the shuttle without undue tension on the thread.
  • the take-up roll will move still more quickly upwardly and forward and will approach the position indicated at f (this being the position it reaches when the main shaft has rotated through three hundred degrees) paying out of the cycle under consideration.
  • the thread passes from pull-off and locking means of known type around the stationary guide roll 85, round the take-up roll 77 and thence directly to the looper and it will be understood that the thread will be paid out to enable the looper and thread hook to lay the thread in the barb of the needle and to enable the needle to rise through the work taking the loop of thread with it by relatively slow movement of the take-up roll along an upwardly inclined and flattened path. It will further be understood that as the thread lifter and needle cooperate to present the loop of thread in position to be seized by the shuttle beak the take-up roll willmov e quicker towards the work along a path directed forwardly (i. e.
  • the take-up roll moves upwardly towards the work still more quickly paying out thread at the requisite speed and thereafter moves downwardly away from the work at a gradually decreasing speed along a path which curves rearwardly to join the upwardly inclined flattened path to draw the formed stitch down on to the work and ready when the machine starts a new cycle, to complete the setting of the look within the work.
  • model 0, efiicient thread control is effected by a rotary take-up device of the kind described if the pinion 63 on the right hand end of the shaft 61 and the pinion 69 which meshes with it both have a pitch diameter of two and a quarter inches and have thirty six teeth and if the shaft 61 is swung backwards and forwards once through an angle of about seventy degrees during one complete rotation of the sleeve 65 (i. e. during one rotation of the main shaft of the machine).
  • the take-up roll will follow the path described in the mannerset forth if the pinion 69 carrying the take-up roll is so assembled into the device relatively to the pinion 63 on the shaft 61 that when the short crank arm 79' projects as shown in Fig.
  • the pinion 69 lies on the forward side of the pinion 63 and at such'a position below the axis of the latter that a line joining the axes of the pinion 69 and the pinion 63 is inclined forwardly and downwardly at an angle of approximately six degrees to the horizontal and a line passing through the axis of the takeup roll '77 and the axis of the pinion 69 which carries it extends downwardly and forwardly at an angle of approximately twenty degrees to the vertical.
  • the thread measuring or pull-off device of the above machine is, as above indicated, similar to that referred to as 153- in the Ashworth patent hereinbefore referred to, and cooperates to measure the length of thread to be pulled off from I the supply with a pair ofthread guiding eyes similar to those referred to as" 159, l60'in that specification.
  • the machine has a thread locking device positioned between the thread supply and the pull-off and another between the pull-0E and the work which cooperates as indicated in the said rior specification to lock the thread between the pull-off and the supply and between the pull-oil and the take-up at the usual times in the cycle of the machine.
  • the thread hook 53 which, as is usual in the particular type of machine being considered, moves rearwardly after engaging the thread and before the looper starts to lay the thread in the needle barb to facilitate the placing of the thread in the barb and remains in its ,rear position engaging the thread until the needle has properly engaged the thread and is starting to rise, at which time the thread hook commences to come forward once more and release the thread.
  • the thread hook has secured to it a downwardly extending leaf spring (not shown) which passes in front of the'thread and acts, as the thread hook moves rearwardly before the looper starts to lay the thread in the needle barb, to grip the thread against a stationary roll behind the thread thus'imparting extra tension to the latter.
  • a downwardly extending leaf spring (not shown) which passes in front of the'thread and acts, as the thread hook moves rearwardly before the looper starts to lay the thread in the needle barb, to grip the thread against a stationary roll behind the thread thus'imparting extra tension to the latter.
  • looper moves across in front 2 the needle and lays the thread in its barb and until the needle has commenced to draw the thread within the Work, at which time the grip is released by rea son of the thread hook moving to its forward position once more than carrying the spring out or" contact with the thread.
  • the disc '75 which carries the take-up roll is bevelled on on its outer face as shown in Fig. 1 to prevent the thread from catching on any projecting corners and cooperates with a disc 76 secur d to the outer end of the pin on which the roll 77 is mounted to guide the thread on to the roll 77.
  • the disc 75 fits into a recess in the cover of the casing 67 in order to prevent the thread from passing between the disc and the casing.
  • a hooked needle lcckstitch shoe sewing chine having, in combination, stitch forr "ngdevices including a hooked needle, needle threading mechanism, a shuttle, and a take-up comprising a rotary member arranged move bodily in a circular path, a thread engaging member mounted eccentrically on rotary nber, and means for rotating the member at varyine speeds and for moving it bodily in said circular path to cause said member 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.
  • a hooked needle loekstitch shoe sewing machine having, in combination, stitch forming devices including a hooked needle, needlethreading mechanism, a shuttle, and a take-up comprising a rotary member arranged to move bodily in a circular path, a thread engaging member mounted eccentrically on said rotary member, and means for rotating the rotary member and for moving it bodily in said circular path to cause the thread engaging member to travel in a path having the form of a non-circular curve.
  • 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 rotary member arranged to move bodily in a circular path, a thread engaging member mounted eccentrically on said rotary member, and means for moving the rotary member bodily said circular path, and for rotating it at varying speeds to cause the thread engaging memher to travel at varying speeds in a path having the form of a non-circular curve.
  • 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 rotary member, a thread engaging memmounted eccentrically on said rotary member, a carrier in which the rotary member is mounted, means for rotating the carrier to cause the rotary member to move bodily in a circular path, a gear concentric with the axis of said carrier, and a gear connection between'said gear and said rotary member for rotating the rotary member during its bodily circular movement.
  • 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 rotary member, a thread engaging 115 member mounted eccentrically on said rotary member, carrier in which the rotary member is mounted, means for rotating the carrier to cause the rotary member to move bodily in a circular path, a gear concentric with the axis 120 of said carrier, a gear connection between said gear and said rotary member for rotating the rotary member during its bodily circular movement, and means for oscillating said concentric gear to vary the speed of rotation of said rotary 125 member.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US623378A 1931-08-12 1932-07-19 Sewing machine Expired - Lifetime US1941943A (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
US1941943A true US1941943A (en) 1934-01-02

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

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

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US (2) US1941943A (enrdf_load_stackoverflow)
FR (1) FR741018A (enrdf_load_stackoverflow)

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FR741018A (enrdf_load_stackoverflow) 1933-02-04
US1941942A (en) 1934-01-02

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