US1952534A - Chain stitch sewing machine - Google Patents

Description

March 1934- N. v. CHRISTENSEN ET AL 1,952,534

CHAIN STITCH SEWING MACHINE v Filed Feb. 1. 1952 s Sheets-Sheet I I 3nnentor S g; J M 1/ 62 0/6754 65 a.

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WW YR attorneys March 1934- N. v. CHRISTENSEN El Al. 1,952,534

CHAIN STITCH SEWING MACHINE Filed Feb. 1952 3 Sheets-Sheet 3 ZiqnentorS (Ittorneg Patented Mar. 27, 1934 UNITED STATES PATENT OFFICE:

CHAIN STITCH SEWING MACHINE Illinois Application February 1, 1932, Serial No. 590,228

3 Claims.

The invention relates to new and useful improvements in a sewing machine, and more particularly to a sewing machine for producing chain stitches at the edge portion of the fabric for hemming, binding or similar stitching.

An object of the invention is to provide a sewing machine of the above type wherein the needle is reciprocated, the looper given its loop taking and needle avoiding movements, and the feed dog given its fabric engaging and feeding movements, all from a single operating shaft arranged above the work support and positively connected by links and oscillated members to the parts actuated thereby.

A further object of the invention is to provide a machine of the above type wherein the main actuating shaft is disposed so as to extend in the general direction of the line of feed so that the connections between the actuating shaft and the parts operated thereby may be reduced in number and simplified.

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 taken from the end of the machine and in a direction at right angles to the feed, the cover plates for the actuating parts being removed and parts being broken away so as to show the inner structure of the machine;

. Fig. 2 is a view partly in section andpartly in plan of the oscillated parts beneath the work support;

Fig. 3 is a view partly in front elevation and partly in vertical section at right angles to the line of feed and at the stitching point, showing the looper, the means for supporting the same and for imparting loop taking movements thereto.

The present invention has to do with the type of machine shown and described in the patent granted Norman V. Christensen and Frederick F. Zeier, March 25, 1930, No. 1,751,508. The machine embodying the invention produces a straight line of chain stitches through the coop eration of a needle and a thread carrying looper which has a loop taking and a needle avoiding motion. The needle and the looper are actuated from a main shaft located above the work support and extending in the general direction of the line of feed. Said shaft is carried by a standard which 'is mounted on the bed and located at one side of the line of feed, and preferably in rear of the stitching point. This standard carries supporting bearings for the main shaft. The

main shaft is preferably inclined at an acute angle to the line of feed so as to better position the shaft for the actuation of the parts beneath the work support. There is an eccentric member on the shaft connected to the needle bar for reciprocating the same. There is an eccentric on the shaft connected to an oscillating member beneath the work support which imparts the loop a taking movements to the looper. There is also an eccentric on the shaft connected to oscillating parts beneath the work support which gives to the looper its needle avoiding movement. There is an eccentric on the shaft which gives the fabric engaging movements to the feed dog, and another eccentric on the main shaft which gives the oscillating movements to the feed rocker. These eccentrics are all carried on the shaft between supporting bearings located adjacent the ends of the shaft, and the links and oscillating 'members for imparting these movements to the looper and feed dog are few in number and of simple stood by a more detail description of the illustrated embodiment thereof. In the drawings, the

machine is shown as including a supporting bed 1 carrying brackets on which the work support 2 is mounted. Also mounted on the bed 1 is a standard 3 which is located at one side of the work support and extends to a position above the work support. Said standard is provided with an overhanging portion 3 carrying bearings for the main actuating shaft indicated at 4. A needle bar 5 carrying the needle 6 is mounted for reciprocation in a sleeve '7 which is rigidly attached to the bracket arm 8 formed as a part of this overhanging portion 3 The sleeve 7 extends only a slight distance above the bracket arm 8 and the needle bar 5 projects above the end of the sleeve. Mounted on the upper end of the needle bar is a collar 9 carrying a pin to which a link 11 is connected. This link 11 at its lower end is connected to a crank carried by a disk 13 which is fixed to the end of the shaft 4. This crank constitutes an eccentric member which imparts, through the link 11, reciprocations to the needle bar.

Cooperating with-the needle beneath the work support is a looper 14. This looper 14 is mounted in a looper carrier 15 which is pivoted at 16 to a depending bracket 17 of the looper support 18. The looper support 18 is provided with trunnions 19 and 20 which are in axial alinement, and these trunnions are mounted in bearings carried til by a bracket 21 which is carried by the bed of the machine. It is noted that the trunnion 19 has the center thereof substantially in a line containing the path of reciprocation of the needle, as clearly shown in Fig. 1 of the drawings. The axis of the shaft 4 is not only inclined to the line of feed, but is also inclined to the plane of the work support. The needle bar reciprocates in a plane which is cut at right angles by the axis of the shaft 4, and therefore, the needle path is in a line inclined to the plane of the work support.

The looper carrier 15 is oscillated for giving to the looper its loop taking movements by means of a link 22. Said link is pivoted at 23 to the looper carrier, and at its other end is pivoted at 24 to an arm 25 carried by ashaft 26 mounted in suitable hearings in the bed of the machine. On this shaft 26 is a collar 27 carrying an arm provided with a ball stud 28 (see Figures 2 and 3). Mounted on the main shaft 4 is an eccentric 29. An eccentric strap 39 cooperates with the eccentric 29, and this eccentric strap is connected to the ball stud 28. As the main shaft rotates, the eccentric strap 30 will oscillate the shaft 26, and the shaft 26, through the link 22 will osciliate the looper, moving the same into and out of the needle thread loop. The looper is provided with an eye 14 at the point thereof, also an eye 14 at the heel thereof, and a looper thread Z is directed to the eyes of the looper so that the looper cooperates with the needle in the formation of locked chain stitches.

The looper support 18 has an arm 31 attached thereto. This arm carries a ball stud 32. On the main shaft 4 is an eccentric with which the eccentric strap 33 cooperates. This eccentric strap at its lower end is attached to the ball stud 32. Thus it is that the eccentric strap 33 is directly connected to the arm 31 which is rigidly attached tothe looper support 18. By the mechanism just described, the looper is given its loop taking movements through an eccentric strap or link which is directly connected to the looper, and is given its needle avoiding movements through an eccentric strap or link and an intermediate oscillated part. All the movements imparted to the looper are of a positive character, and the actuating mechanism is very simple and of few parts, notwithstanding that the actuating shaft is above the work support, while the looper is beneath the work support.

Cooperating with the needle beneath the work support is a guard or needle guide 34 adjustably connected to an arm 35 which is attached to the bracket 21 by suitable bolts 36. The needle guard is secured to the 35 by screws 3'7, 37, passing through slots in the arm. The needle guard 34 is inclined so as to be substantially parallel with the path of the needle and may be adjusted vertically to bring said guard into proper cooperation with the needle.

The material is fed across the work support 2 by a feed dog 38. This feed dog is carried by a feed bar 39 which is pivoted at 40 to a feed rocker 41. The feed rocker carries arm 44. On the main shaft 4 is an eccentric 43. An eccentric strap cooperates therewith and is attached to a ball stud 46 attached to the arm 44. Said ball stud is shiftable in a slot 4? in the arm so that the extent of oscillation imparted to the rock shaft may be varied. This provides a means for directly oscillating the rock shaft from the eccen- --tric'-strap cooperating with an eccentric on the main shaft which is above the work support. This eccentric is substantially directly over the connection to the arm on the rock shaft, and this is one of the purposes of extending the main actuating shaft in the general direction of the line of feed. It also enables the eccentrics for the other actuated parts to be placed more directly over the parts to which they are connected.

The feed dog is raised and lowered by an eccen-- tric 48 on the main shaft 4. Cooperating with this eccentric is an eccentric strap 49 which is connected to a ball stud 50 on an arm 51 pivoted at 52 to the frame of the machine. pivoted also to the stud 50 carrying the ball with which the eccentric strap 49 cooperates. This link 53 is pivoted at its lower end to the feed bar and raises and lowers the feed dog 38. When it is desired to impart a differential feeding movement to the fabric, an auxiliary feed dog is used which is pivotally supported on the feed bar and is controlled in its movements by a shiftable arm 54. The feeding mechanism described in detail is similar to that of the Christensen and Zeier patent above referred to.

The fabric is held on the work support by a presser foot 55 which is attached to an arm 56 rigidly attached to a shaft 57 mounted in bearings in the frame of the machine. A rod 58 extends into the overhanging portion 3 of the bracket, and is spring-pressed against the arm 56 for yieldingly holding the presser foot in engagement with the fabric. The tension on the spring is controlled by a lLnurl-headed bolt 59.

Mounted in the standard 3 of the machine is a bracket 69 which is secured to the standard by bolts 61, 61 passing through slots in the bracket and threaded into the standard. This bracket may be raised and lowered and is for the. purpose of supporting attachments to be used in guiding and directing the fabric, and is particularly adapted for supporting an English binder, which directs the binding about the edge of the fabric. This binder and the supporting means therefor has not been shown in detail in this application, but is shown, described and claimed in the application of George Sauer, Serial No. 590,277, filed of even date herewith.

The needle thread is indicated at n in the drawings. The control for the needle thread and the looper thread includes movable devices carried by the link which re'ciprocates the needle bar. This thread controlling mechanism forms no part of the present invention, but is shown, described and claimed in an application filed by Charles F. Rubel, Serial No. 603,291, filed April 5, 1932.

While a single needle machine is shown, it will be understood that a plurality of needles may be used with a cooperating looper for each needle, or with a looper cooperating with more than one needle. It will also be understood that other forms of stitching mechanism may be used in the machine described, but the invention is directed particularly to a machine wherein there is a thread carrying looper having both a loop taking and a needle avoiding movement, and wherein all of the actuating parts of the machine are operated directly from a main actuating shaft located above the work support. While the shaft is shown as inclined to the plane of the work support, and the needle moving in a path inclined to said plane, it will be understood that from certain aspects of the invention, the needle may be set so as to move in a vertical path. It is essential, however, that the main actuating shaft shall extend in the general direction of the line of feed so as to facilitate the direct operation of A link 53 is the parts beneath the work support from said shaft.

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 We claim as new and desire to secure by Letters-Patent, is-

l. The combination of a supporting bed, a work support carried thereby, a standard carried by the bed and disposed at one side of the work support, an actuating shaft located above the plane of the Work support and disposed so as to extend in the general direction of the line of feed and located substantially in rear of the stitching point, a needle, means for operating said needle from said actuating shaft, a thread carrying looper cooperating with said needle beneath the work support, a carrier on which said looper is mounted, a loo-per support on which said carrier is pivoted, means operated by said actuating shaft and directly connected to said looper support for oscillating the same and giving to the looper a needle avoiding movement, a shaft located beneath the work support, means for connecting said shaft to the looper carrier for moving the looper into and out of the needle thread loop, and means actuated by said actuating shaft and directly connected to the shaft beneath the work support for oscillating the same.

2. The combination of a supporting bed, a work support carried thereby, a standard carried by the bed and disposed at one side of the work support, an actuating shaft located above the plane of the work support and disposed so as to extend in the general direction of the line of feed and located substantially in rear of the stitching point, spaced bearings carried by the standard in which said shaft is mounted, a reciprocating needle bar carried by the standard, a needle carried thereby, an actuating member carried by said shaft and connected to said needle bar for reciprocating the same, a looper support mounted beneath the work support for oscillation about an axis at right angles to the line of feed, a looper carrier pivoted to said looper support for oscillations about an axis substantially parallel with the line of feed, a looper mounted on said carrier, means actuated by said shaft and directly connected to said looper support for oscillating the same and giving to the looper a needle avoiding movement, and means operated by said shaft and connected to said looper carrier for moving the looper into and out of the needle thread loop.

3. The combination of a supporting bed, a work support carried thereby, a standard carried by the bed and disposed at one side of the work support, an actuating shaft located above the plane of the work support and disposed so as to extend in the general direction of the line of feed and located substantially in rear of the stitching point, spaced bearings carried by the standard in which said shaft is mounted, a reciprocating needle bar carried by the standard, a needle carried thereby, an actuating member carried by said shaft and connected to said needle bar for reciprocating the same, a thread carrying looper located beneath the work support and cooperating with said needle, a support for said looper, an actuating member carried by the shaft, a link cooperating therewith and directly connected to said support for oscillating the same, a second actuating member carried by said shaft, a link cooperating therewith, an oscillating part to which said last-named link is connected, and a link connecting said oscillating part to the looper for giving to the looper its loop taking movements.

NORMAN V. CHRISTENSEN.

FREDERICK F. ZEIER.

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