US1524203A

US1524203A - Looper-thread controller

Info

Publication number: US1524203A
Application number: US593022A
Authority: US
Inventors: Onderdonk Lansing
Original assignee: Union Special Machine Co
Current assignee: Union Special Machine Co
Priority date: 1922-10-07
Filing date: 1922-10-07
Publication date: 1925-01-27
Anticipated expiration: 1942-01-27

Description

3 Sheets-:Sheet 1 Filed Oct. '7, 1922 Whoa Snowy Jgfl, 27. 1925.

L. ONDERDONK LOOPER THREAD CONTROLLER 3 Sheets: $heet 2 Filed 001:. 7, 1922 ONDERDONK LOOPER THREAD CONTROLLER n Filed Oct. 7, 1922 s Sheets-SheL s IIIIII u I M; J6 w G mmmll Patented Jan. 27, 1925.

UNITED STATES 1,524,203 PATENT OFFICE.

LANSING ONDERDONK, OF NEW YORK, N. Y., ASSIG-NOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LOOPER-THREAD CONTROLLER.

Application filed October 7, 1922.

To' all whom it may concern:

Be it known that I, LANSING ONonRDoNK, a citizen of the United States, residing at New York city, in the county of New York, State of Newlork, have invented certain new and useful Improvements in Looper- Thread Controllers, of which the following is a description, reference being had to the accompanying drawing and to the figures of reference marked thereon.

The invention relates to new and useful improvements in a looper thread controlling mechanism, and more particularly to a thread controlling mechanism for a thread carrying looper which is mounted to move back and forth in a single horizontal plane.

An object of the invention is to provide a thread controller, wherein the looper thread is taken up on the backward movement of the looper, and wherein the looper thread is given up to the looper as it moves forward into the needle thread loop.

A further object of the invention is to provide a thread controlling mechanism of the above type, wherein the thread is taken up by means of a movable arm cooperating with spaced thread guides which are mounted so that they may be adjusted for varying the amount of thread taken up.

A further object of the invention is to provide a thread controlling mechanism of the above type, wherein the arm is oscillated by means of an eccentric which is capable of being adjusted on the shaft which carries the same so as to vary the time when the maximum pull of the arm on the thread occurs.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings which show by way of illustration one embodiment of the invention Figure 1 is a view partly in section and partly in plan, showing a machine embodying my improvements;

Fig. 2 is a side view of the standard of the machine and showing in side elevation the looper thread controlling mechanism;

Fig. 3 is a vertical sectional view through the oscillating arm and the mechanism for oscillating the same;

Fig. 4 is a perspective view of the oscillating yoke carryingthe arm which engages the thread;

Serial No. 593,022.

Fig. 5 is a perspective view of the thread guides between which the arm oscillates and the supporting bracket for said thread guides;

Fig. 6 is a perspective view of a supporting bracket for the oscillating yoke;

Fig. 7 is a diagrammatic view in plan showing the position of the thread arm when the looper is at the forward end of its stroke;

Fig. 8 is a detail showing the position of the thread arm and thread guides when the looper is at the forward end of its stroke.

I have shown the invention as applied to a sewing machine having a thread carrying looper which oscillates in a single horizontal plane. The looper is curved and disposed so as to move in a path to which the feed line is substantially tangential and the looper is moving in a direction opposed {to the feed as it enters the needle thread oop.

The looper thread is controlled by means of an oscillating arm which vibrates back and forth between two spaced thread guides. The looper thread passes through these guides on its way to the looper. The oscillating arm engages the thread and draws 011 the thread as the looper is moving backward so as to take up all the slack in the looper thread, the thread being pulled off from the supply by the looper in its forward movement. This arm also gives up thread to the looper as it moves forward to permit the looper to move freely into the thread loop and the feed of the fabric to take place.

Means is provided for shifting the position of the thread guides so as to vary the amount of thread taken up. The oscillating arm is vibrated by a rotating eccentric and this is capable of being shifted on its supporting shaft so as to vary the time of maximum pull on the thread.

Referring more in detail to the drawings, I have shown my improved thread controller as applied to a sewing machine having a supporting bed 1 and a standard 2, which carries the usual overhanging arm. Located beneath the work support is a thread carrying looper 3 which is pivoted to swing about a vertical axis 4:. Said thread carrying looper is mounted on a looper carrier having an arm to which a link 6 is pivoted, said link being pivoted to the arm at 7. Also, located beneath the work support is a vibrating lever 8, and the other end of the link 6 is pivoted at 9 to said lever. The lever is vibrated by means of a link 10 connected to a crank mounted on a vertical rotating shaft 11. This looper operating mechanism forms no part of the present invention except in combination with the thread controlling mechanism, but is shown, described and claimed in my copending application Serial No. 576,270, filed July 20, 1922.

The material is fed across the work support by a feed dog 12 which may be of the usual construction. The looper 3 moves in a curved path about the axis 4t as a center. The line of feed is substantially tangential to this curved path. The feed moves the fabric in the direction of the arrow, Fig. 1, and therefore the looper is moving in a direction opposed to the feed as it enters the needle thread loop.

The thread from the supply passes through a thread guide 13 formed in an arm 14 and also through a thread guide 15 formed in an arm 16. The

arms

14 and 16 are preferably formed integral with a bracket 17 having slots 18-18 through which screws 1919 pass for securing the bracket to the standard 2- of the machine. These slots are horizontal and permit the bracket to be shifted horizontally, as viewed in Fig. 2, either to the right or left.

The thread runs from the thread guide 15 underneath a guiding plate 20. Said guiding plate is provided with a forked end which forms a guiding recess 21 to receive the thread. The work support is provided with a groove for the thread to run in and when the thread leaves the forward end of the guide plate 20 it passes directly to the heel ot the looper 3.

(isci-lla'ting between the

thread guides

13 and 15 is athroad arm 21. Said thread arm 21' is mounted in an oscillating yoke 22, see Fig. 4. Said yoke has a proJecting sleeve 23 which receives the arm 21 and a set screw 24 secures the arm in said sleeve. The arm may be adjusted in and out of the slceveand to a limited extent. The yoke 22 'is provided with a pivot bearing This pivot {bearing lies between the arms 2626 :of the bracket 27 and a pivot pin 28 passing through these arms 26-26 and the pivot 'bearing'25 serves as a support for the yoke. The pivot pin is preferably secured to the yokoand oscillates therewith. The bracket -27 is provided with enlarged openings 2929 which receive screws 8030 and these enlarged openings permit a slight adjustment of the supporting .bracket for the yoke.

In the standard there is'a vertically arranged-rotating shaft '11. Said shaft 11 carriesabeveled-gear 31 and engages a beveled gear 32 on the main shaft 33. Mounted on this vertical shaft 11 is a sleeve 3-1 which cal" ries an eccentric 85. The eccentric 35 lies bctwccn the arms of the yoke 22 and as the occentric rotates the yoke will be oscillated. The yoke is preferably provided with a plate 9-6 which closes the open end of the yoke and said plate is se ured to the yoke by suitable screws passing through openings 37-37 and threaded into the opening 38. A lubricating pad 39 is carried by the plate 36 and rests on a shelf 4-0 formed integral with the plate 36. The lubricating pad 39 serves to lubricate the contacting parts between the yoke and the eccentric.

The sleeve 34 is scoured to the shaft 11 by means of a set screw 41. It will readily be seen that by loosening this screw 4-1 the sleeve may be turned on the shaft 11 and thus the ecentric shifted about the axis of the shaft.

The arm 21 bent upwardly at 42 and thence inwardly at 43 and the upper arm 14- carrying the thread guide 13 is located between the main portion of the arm 21. and this inwardly bent portion a IGSlllt the inwardly bent portion 4-3 as well as the arm 21 engages the looper thread, as clearly shown in Fig. 2.

The oscillations of the arm 21 are so timed that when the looper moves forward, said arm will move toward the thread guides and will give up thread to the looper.

This with the pulling off action of the looper from the supply, insures that the looper shall have plenty of slack thread as it moves forward and also provides a suiticient amount of the slack for feeding which occurs as the looper reaches the forward end of its stroke. this slack being utilized for the succeeding stitch.

it will be noted that the link (3 and the lever 8 move toward alinement as the looper moves toward the forward end of its stroke and those parts are so positioned as to move into alinemcnt and thus give a dwell to the looper at the forward end of its stroke while. the feed is taking place. The thread arm 21' moves from a position slightly to the left of the thread guides 13 and 15, see Fig. 7, to a position at a considerable distance to' the right thereof, as shown in Fig. 2. The thread arm is in the position shown in Fig. 7 when the looper is at the forward end of its stroke and is out of engagement with the looper thread. hen the looper moves backward, the thread arm will move. into engagement with the looper thread and will take up the slack created by the backward movement of the looper.

' The amount of thread taken up by the movable thread arm depends, of course, upon the position of the thread rides 13 and 15 and as these are adjustable in a direction parallel with the plane of oscillation of the arm, the amount of thread taken up may be varied. The thread arm may be adjusted in its supporting sleeve in a direction radially of the operating shaft and this enables the arm to be properly set to cooperate with the thread guides in its various adjusted positions. The eccentric which oscillates the thread arm can be adjusted and when said eccentric is shifted it will, of course, vary the time when the thread arm reaches its maximum throw in engagement with the thread relative to the position of the looper.

It is obvious that minor changes in the details of construction may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters-Patent, is

l. The combination with a thread carrying looper, means for supporting said thread carrying looper whereby the same oscillates in a single horizontal plane, of a thread controlling mechanism including spaced guides through which the looper thread passes, an arm oscillating between said guides, means for oscillating said arm whereby the looper thread is taken up on the backward movement of the looper and is given up on the forward movement of the looper, said oscillating means including an eccentric, and means whereby the same may be shifted to vary the time of movement of the thread arm relative to the movements of the looper.

2. The combination with a thread carrying looper, means for supporting said thread carrying looper whereby the same oscillates in a single horizontal plane, of a thread controlling mechanism including spaced guides through which the looper thread passes, an arm oscillating between said guides, a pivoted yoke supporting said arm, a rotating eccentric cooperating with said yoke for oscillating said arm, and means for adjusting said thread guides whereby the amount of thread taken up may be varied.

3. The combination with a thread carrying looper, means for supporting said thread carrying looper whereby the same oscillates in a single horizontal plane, of a thread controlling mechanism including spaced guides through which the looper thread passes, an

arm oscillating between said guides, a pivoted yoke, a bracket supporting said yoke, a rotating shaft, an eccentric on said rotating shaft for oscillating said yoke, a plate for closing the open end of the yoke, and a lubrieating pad carried by said plate and engaging said eccentric.

4:. The combination with a thread carrying looper, means for supporting said thread carrying looper whereby the same oscillates in a single horizontal plane, of a thread controlling mechanism including spaced guides through which the looper thread passes, an arm oscillating between said guides, a pivoted yoke, a bracket supporting said pivoted yoke, a rotating shaft, an eccentric on said rotating shaft for oscillating said yoke, means for adjusting said thread guides for varying the amount of thread taken up, and means for adjusting the said eccentric for varying the time of oscillation of the arm relative to the movements of the looper.

5. The combination with a thread carrying looper, means for supporting said thread carrying looper whereby the same oscillates in a single horizontal plane, of a thread controlling mechanism including spaced guides through which the looper thread passes, an arm oscillating between said guides, an oscillating yoke having a sleeve in which said arm is mounted, said arm being capable of adjustment endwise in the sleeve, means whereby said thread guides may beadjusted for varying the amount of thread taken up, and means for oscillating said yoke.

6. The combination with a thread carrying looper, means for supporting said thread carrying looper whereby the same oscillates in a single horizontal plane, of a thread controlling mechanism including spaced guides through which the looper thread passes, an arm oscillating between said guides, an oscillating yoke having a sleeve in which said arm is mounted, said arm being capable of adjustment endwise in the sleeve, means whereby said thread guides may be adjusted for varying the amount of thread taken up, a rotating shaft, an eccentric on said shaft for oscillating said yoke, and means for ad justing the eccentric about the shaft.

In testimony whereof, I affix my signature.

LANSING ONDERDONK.