US1252352A - Looper mechanism for leather-sewing machines. - Google Patents

Description

0. L. LAWSON &1. H. REED.

LOOPER MECHANISM FOR LEATHER SEWING MACHINES.

APPLICATION FILED MAR. 27 1915.

Patented Jan. 1,1918.

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OSCAR L. LAWSON AND JAMES H. REED, F LYNN, MASSACHUSETTS.

100m MECHANISM FOR LEATHEB FSEWING I :ZO all whom it may concern:

Be it known that we, OSCAR L. LAWSON, ;a subject of the King of Sweden, and .JAMES H. REED, a citizen of the United States, residing at Lynn, county of Essex, State of Massachusetts, have invented a certain new and useful Improvement in ments in shoe sewing machines of the type shown in Patent No. 1,194,512 to Oscar L. Lawson, dated Aug. 15, 1916', and relates particularly to the mechanism by means of which the under thread is placed in the book of the needle before it is drawn up through the work to form the loop through which the shuttle thread is passed.

The present invention provides means for placing the thread in the needle accurately even when the machine is run at very high speed. This is accomplished by means of a looper having an eye therein, and a hook cooperating therewith. The parts have such movement relatively to each other and to .the needle that the back of the hook does not strike against the thread as it comes into position ready to perform its work and therefore has no tendency to displacethe thread or fray or break it. The mechanism by which this is accomplished is very simple. The invention will be fully understood by reference to the following description taken in connection with the accompanying drawings and the novel features thereof will be pointed out and clearly defined in the claims at the close of the specification. Referrin to the drawings, Figure 1 is a side elevation. of stitch forming instrumentalities embodying our invention.

Fig. 2 is a front elevation of the looper,

"hook and needle, showing the formation of the horizontal line of thread which is placed in the hook of the needle.

Fig. 3 is a front elevation showing the position of the looper and hook just before the hook contacts with the thread.

Fig. 4 is a side elevation showing the parts in the same position as in Fig. 2.

Fig. 5 shows the parts in the position 00- cupied by the looper after ithas been oscillated to place the thread in the hook ofthe ne d ej.

Specification of Letters Patent.

. Application filed March 27, 1915. Serial No. 17,530.

Patented Jan. 1, 1918.

i 6 is a plan view of theseparts show- I F ing t em in the same position as in Fig. 5.

ig. 7 is a detail of the connection between the end .of the fork 38 and the looper shaft 18.

In the drawings, and particularly-in Fig. 1 there is shown at 11 the shuttle, at 12 the hook needle, at 13 the presser foot and at 14 the work support, and at 15 the awl,

these parts being in general the same as those shown in said patent.

The under thread is placed in the hook of the needle 12 after it has passed 'down through the work by the cooperation of a looper 16 having an eye or thread guidin portion therein through which the three passes, and a. hook 17. The looper 16 comprises a shaft 18 bent near the top at right angles. The looper shaft 18- is slidable in two lugs 19 and 20 in or secured to a fixed part A of the machine. This upward sliding movement of the looper and hook is for the purpose of getting these members out of the path of the awl 15 when not employed in placing the thread in the hook of the needle 12 and also to bring them and the under thread into position to lay the thread in the hook of the needle. While this movement is in an inclined plane, it is conveniently referred to as an upward movement because its main object is to move the said parts to and away from the underside of the work support.

The upward movement of the looper and hook is produced by rotation of the cam 21 mounted on the cam shaft 22, said cam having a cam groove 23 in its face. In this cam groove is a follower 24 mounted on cam lever 25 pivoted at 26 to the frame of the machine. To the lower end of the looper shaft 18 is secured a block 27 having two projections 28 and'29 (see Fig. 2) between which is a space of suitable shape to engage a disk or ball 30 formed on the end of the cam lever 25. The looper shaft 18 is free to rotate in the block 27 but is adapted to be moved vertically by it by means of a plate 31 engaging a circular groove 32 in the looper shaft. It will therefore be seen that although the looper is free to be rotated about its longitudinal axis it is given a lon 'tudinal reciprocation by the rotation of t e cam 21. r 4

The hook 17 is pivotedat 33 to the block 27carriedbythel00pershaft. Alinkiie which is pivoted at one end at 35 to the frame A of the machine is pivoted at its other end atv 36 to the hook 17. It will therefore be seen that as the looper 16 is slid longitudinally by the rotation of the cam 21 the link 34 will swing the point or tip of the hook toward or away from the eye or thread guiding portion of the loo er in a practically horizontal line. This wi clearly be seen from an examination of Fig. 2 where;

guiding orward in an are formed about the axis of the looper shaft as a center, the eye or thread guiding portion of the looper being offset and at a distance from the longitudinal axis of the looper. The path of movement of the eye of the looper is shown by a dot and dash line in Fig.6. This oscillation of the looper is accomplished in the following manner In the cam 21- is formed a cam groove 36 in which is located a cam follower 37 mounted on a fork 38 which spans the shaft 22. The fork is therefore reciprocated in a horizontal plane by the rotation of the cam. The end of the fork 38 is secured to a member 39. (See particularly Figs. 2 and 7.) Said member 39 is pivotally connected by a pin 40 to a block 41 in which the looper shaft 18 is slidably mounted. Beneath the block 41 .is a projection or lug 43 by which the block is supported and prevented from sliding lengthwise of the looper shaft.

The block 41 and the looper shaft 18 are connected by means of a feather and groove 42, so that while the loo er shaft is slidable vertically it will be osci lated by the in and out movement of the fork 38.

The operation of the device is as follows The needle 12 passes through the hole in the work formed by the awl. About this time, the looper and hook are in the position shown'in Figs. 1.and'3. The hook and looper then rise, the hook being moved laterally to the position shown in Fig.2 as it rises, forming a horizontal portion a of the thread. Thereafter the looper is oscillated about its vertical axis to the position shown in Fig. 6 by the cam groove 36, and connecting members. This movement carries the thread forward and lays it in the hook of the needle. The needle then rises carrying the thread with it through the work and the hook, and looper descend out'of the path ofthe awl.

What we claim is:

1. A looper mechanism for ahook needle sewing machine comprising a looper and hook movable longitudinally toward the position of'the needle and pivoted together, and a link connected at one end to one of said membersand at the other to a fixed part of the machine and adapted to cause the longitudinalmovement of said members to move the point of one of said members relatively to the other in a direction transverse to the line of movement of said members toward the needle.

2. A looper mechanism for a hook needle sewing machine comprising a looper and hook slidable longitudinally toward the position of the needle, one of said members having a thread guiding portion offset from the longitudinal axis of the member, means for moving onerof said members laterally of the line of movement of said members toward the needle, and means for moving the offset member about its longitudinal axis in an arcuate path to lay the thread in the hook of the needle.

3. A looper mechanism for a hook needle sewing machine comprising a looper and hook pivoted together and movable longitudinally toward the position of the needle, means for moving one of said members laterally of the line of movement of said members toward the needle whereby the thread is pulled out to form a transverse portion which is adapted to be laid in the hook of the needle, one of said members having 'a' thread guiding portion offset from the longitudinal axis of the member, and means for moving the offset member about its longitudinal axis in an arcuate path after the thread is drawn out to lay the thread in the hook of the needle.

In testimony whereof we aflix our signatures, in presence of two witnesses.

GEORGE P. Dme, Amos H. MORRISON.-

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