US2000254A - Lockstitch sewing machine - Google Patents

Lockstitch sewing machine Download PDF

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Publication number
US2000254A
US2000254A US705408A US70540834A US2000254A US 2000254 A US2000254 A US 2000254A US 705408 A US705408 A US 705408A US 70540834 A US70540834 A US 70540834A US 2000254 A US2000254 A US 2000254A
Authority
US
United States
Prior art keywords
thread
needle
loop
barb
shuttle
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
US705408A
Other languages
English (en)
Inventor
Ricks Fred
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
Application filed by United Shoe Machinery Corp filed Critical United Shoe Machinery Corp
Application granted granted Critical
Publication of US2000254A publication Critical patent/US2000254A/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

  • One of the several objects of the present invention is to improve the machine disclosed in the said co-pending application by providing means which shall ensure that the needle thread will be lifted out of the needle barb. at the correct time in the machine cycle without danger.
  • a shoulder which is so arranged that after the loop of needle thread has been taken out of the needle barb by the aidof this cam action its rearward limb can, during continued lifting action of the shuttle beak, flick into a recess operated by said shoulder andthus be deflected quicklysomewhat to-one side of the plane in which the needle moves, thus assisting in overcoming the danger which would exist if the said limb of the loop were to remain in the plane in which the needle moves after the loop has been taken off the needle, that the said limb might deflect itself so as to be struck and pierced byithepoint-of theneedle which latter moves forwardly and downwardly towards the work during and somewhat afterthetime when the loop is being taken out of the needle barb.
  • the said illustrative embodiment of the present invention means is preferably provided for pre-, venting the slight possible reeving or chafing of the needle thread through the barb of the needle as the thread lifterexerts its lifting action on the loop' of needle thread to open the loop forthe reception of the shuttle beak.
  • the needle guide of the machine which serves to support the needle against bending during its Work penetrating action, is ar-' ranged to be moved in such a manner that as the thread lifter moves into engagement with the thread loop and thenopens the latter, the limb of thethread loop in the needle barb which extendsdown to the stitch last formed is trapped against the closed end of the barb by the v needle guide in a sufliciently. positive man-' ner to prevent reeving of thethread through the barb, the thread lifter acting on the other limb of the loop to draw up the additional amount of thread required for the opening of the loop from the rising thread take-up device.
  • the needle guide is arranged to release the thread and be retracted as the thread lifter approaches the top, of its stroke so that the lifting action of the shuttle beak on the thread loop, which commences just about as the thread lifter reaches thetop of its stroke, shall be unimpeded by presence, close to the needle barb of the needle guide.
  • Figure 1 is a. front view showing part of a shuttle of the said illustrative embodiment"
  • Figure 2 is a right hand side elevation of the shuttle seen in Figureil; I
  • Figure 3 is a rear view of the -shuttle beak
  • Figure 4 is a-view of theshuttlebeak looking inthe direction of the arrow .
  • Figures 5 and 6 are respectively front and right hand-views'showing' the relation of certain parts of the illustrative embodiment at one stage in a cycle of the machine when the'shuttle beak is about toenter the loop of needle thread
  • Figures I and 8 are front andrl'ght hand side views showing the same parts at a slightly later stage in the machine cycle when the shuttle beak is just about to remove the loop from the needle barb;
  • Figures 9 and 10 are front and right hand side views showing the same parts at a still later stage'in the machine cycle just after the loop has left the needle barb;
  • p v Figure 11 is a view looking in the direction of the arrow seen in Figure 7;
  • Figure 12 is a view looking in the direction of the arrow seen in Figure 9; and c Figure 13 is a vertical-sectional view illustrating the construction and relative arrange ment of some of the principal parts of a machine embodying the several features of 'the present invention.
  • the machine of the'present illustrative embodiment can be assumed to be generally similar, except in so far as is'hereinafter pointed out, to the machine disclosed in the specification of the co-pendin'g application aforementioned and reference is directed to said specification for a detailed understanding of the construction and operation of parts of *the machine" which are only briefly referred to hereinaften tive embodiment is indicated generally at I, the general construction and driving arrangement of the shuttle being similar to that of the shuttle disclosed in application No. 688,480.
  • the beak 2 of the shuttle of the presentillustrative embodiment has formed on it an outwardly directed cam member which acts at the time-and in the manner hereinafter indicated to urge thread passing from the needle barb to the thread lifter rearwardly toward the open end of the barb.
  • This cam member is formed on the rear side of the beak, looking at the machine from the front, and extends from the-loop entering end of the beak-rearwardly at-an angle of about 510 to the plane in which the shuttle rotates.
  • the cam member is about three quarters of an inch long and extends cam member is inclined downwardly towards the rear to form a smooth continuation of the upper thread engaging face of the beak.
  • the upper face 6 of the cam is cut away or stepped down at 8 to provide a recessed portion into which the needle loop may snap at the instant that the shuttle beak acts to lift the, thread clear of the needle barb, the sudden snapping of the thread into ,this recessed portion allowing the tension in the thread to relax somewhat in an instantanerl ous manner to allow the thread to whip more easily out of the needle barb.
  • the endofthe cam face which is remote from the loop-entering end of thebeak does not slope gradually to rejoin the shuttle body but ends more or less abruptly as shown for example in Figure -8 to constitute a shoulder and thus create a notch into which the thread may slip, due to the rotation of the shuttle, soon after the loop of thread has been taken off the needle by the shuttle beak.
  • the needle guide of the machine through which the needle passes and by which it is supported during its work penetrating stroke isv j indicated at 22, see particularly Figures 6, 8'
  • the needle guide is socontrolled and moved, in the present illustrative embodiment, by cam mechanism of the general character described in application No. 688,480 that, just before the thread lifter engages the needle loop,
  • the needle guide i. e. the needle guide
  • the needle guide remains in gripping engagement with the thread, thus preventing movement of the latter through the barb, during the whole of the time that the thread lifter is engaging the right handlimb of the needle loop and to lift it to open the loop for the reception of the shuttle beak and. releases itsgrip on the thread as the thread lifter is reaching the top of its stroke and the shuttle beak has just engaged the loop.
  • the fact that: the thread..;is”. held gripped in the needle barb :against'm'ovement as the loop is being opened.
  • the threadlifter prevents the rising action of 1 the threadlifter from causing any movement of'the threadito take place through the barb and therefore avoids such chafing of the thread 'as-fwould' be likely to occur if the thread were free to'move through the barb as the thread lifterexerts a tension'on the thread in opening the loop.
  • the needle continues its descending movement part-way towards the work during the time thatv the shuttle is rotating after having lifted the thread loop off the needle, and remains in a lowered position during the time that the loop is being pulled oil; the shuttle by the take-up.
  • the needle guide is moved downwardly along the needle to cover the needle barb soon after the loop has been lifted from the needle and remains substantially in this position until the setting of the stitch has been completed.
  • the thread lifter hascommenced to descend and willbe moving down sufficiently rapidly to cross the needle path below the point of the latter.
  • the shuttle beak will have moved upwardly sufiiciently far for the thread to slip around the shoulder into the recess the thread moving, in moving around the shoulder, somewhat towards the left of the needle plane, thereby assisting the continued rotation of the shuttle beak to carry the limb of thread which passes up from the work to the rear side ofthe shuttle beak out of the needle plane and thus ensuring that it will not be struck and pierced by the descend ing needle.
  • the thread lifter actuating mechanism may be modified so that in opening the needle loop, it rises to a somewhat higher position, before the shuttle beak engages the thread, than is really necessary to open the loop sufiiciently for the shuttle beak to enter, thus drawing a little surplus thread into the loop. With 7 and therefore making it easier for the thread 1 to escape from the barb.
  • a lockstitch sewing machine having, in
  • stitch forming devices comprising a. curved hooked needle, a loop lifter and a discoidal shuttle provided with a beak to enter the loop held by the needle and loop lifter and with a cam on the shuttle beak projecting beyond the shuttle. body" towards. the needle. to lift the needle loop from the needle barb.
  • a lockstitch sewing machine having, in combination, stitch forming devices comprising a. curved hooked needle, a loop lifter and a. discoidal shuttle provided with a beak to enter the loop held by the needle and loop lifter and with a cam on the shuttle beak projecting beyond the shuttle body towards the needle to lift the needle loop from the. needle barb, said cam terminating in a shoulder on the side of the shuttle towards the needle, and thereby forming a notch to receive the thread taken from the needle barb and deflect. it away from the plane of, the needle.
  • Av lockstitch sewing machine having, in combination, stitch forming devices comprising a curved hooked needle, a. needle guide, a, loop lifter, a discoidal shuttle provided with a beak to enter the loop held by the needle and loop lifter, and means for actuating the needle guide to hold the thread gripped inv the needle barb during the thread lifting movement of. the thread liften.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US705408A 1933-02-02 1934-01-05 Lockstitch sewing machine Expired - Lifetime US2000254A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3176/33A GB416002A (en) 1933-02-02 1933-02-02 Improvements in or relating to sewing machines

Publications (1)

Publication Number Publication Date
US2000254A true US2000254A (en) 1935-05-07

Family

ID=9753362

Family Applications (1)

Application Number Title Priority Date Filing Date
US705408A Expired - Lifetime US2000254A (en) 1933-02-02 1934-01-05 Lockstitch sewing machine

Country Status (4)

Country Link
US (1) US2000254A (fr)
DE (1) DE640031C (fr)
FR (1) FR768043A (fr)
GB (1) GB416002A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE911575C (de) * 1939-03-22 1954-05-17 United Shoe Machinery Corp Steppstich-Schuhnaehmaschine

Also Published As

Publication number Publication date
DE640031C (de) 1936-12-22
FR768043A (fr) 1934-07-30
GB416002A (en) 1934-09-03

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