US1892164A - Sewing machine for stitching over fastener means - Google Patents

Description

L. ROSEMAN Dec. 27, 1932.

SEWING MACHINE FOR STITCHING OVER FASTENER MEANS Filed Feb; 4, 1931 INVENTOR Lea 5056011111,

A TTORNEY Patented Dec. 27, 1932 UNITED STATES PATENT; OFFICE LEO ROSEMAN, OF NEWARK,NEW JERSEY Application filed February 4, 1931. Serial No. 513,255.

This invention relates to improvements in sewing machine attachments to adapt the machine for stitching over fastener means, such e. g. as tape having metallic eye loops thereon; and the invention has reference, more particularly, to specificjmprovements in fastener stop and positioning means of the kind shown in my co-pending application for Letters Patent Serial Number 49%,525, filed November th, 1930. p

In my said co-pending application I have disclosed a stop means which operates co1ncidentally with each stitch-forming reciprocation of the machine needle; the specific embodiment of said stop means disclosed in said application comprising a stop-arm carried by a rock-shaft spring pressed in one d rection to bring the stop-arm into active position and cam-actuated to move the stop-arm in-inactive or released position. In the present invention I have devised a modified form of stop-arm actuating means comprising a rockshaft to carry the stop-arm, a lever for oscillating said rock-shaft, and a 'cam for positively controlling the movements of said lever and rock-shaft, whereby the stop-arm is positively moved and maintained in active position. Owing to the positive control exercised by the cam the stop-arm cannot acci- 30 'dentally yield or jump out .of its active position; and, furthermore, even though it engage on top of a fastener element to be stitched over, it will exercise a clamping effect thereon, thus holding the same against undesired displacement or advance into the path of a descending machine needle.

The present invention has for its principal object, therefore, to both simplify the means for producing timed movements of the stop- 40 arm relative to the reciprocating sewing nee dle, and to exercise a more positive control of the stop-arm at all times, both .as to its active as well as to its inactive or rel ased positions relative to fasteners to be stitched across during the operation of the sewing machine. V V

This invention .has for a'more specific object to provide .a form of'stop means oscillating cam which will both positively move and maintain the stop-arm inactive position and also positively move the same to inactive or released position in desired timed relation to the stitch-forming operations of the machine.

An illustrative embodiment of the present invention is shown in the accompanying drawing, in which Fig. 1 is a plan view of the stop-mechanism, and Fig. 2 is a vertical transverse section of the same, taken on line 22 in Fig. 1.

Referring to said drawing, the reference character 5 indicates the sewing table or bed plate of any'suitable type of sewing machine, beneath which is arranged the drive shaft 6 of the machine, from which the sewing mech anism thereof is driven in the manner familiar to those acquaint-ed with the sewing machine art. The sewing mechanism includes the usual throat-plate, feed-dog, presser foot and thread looper (which parts are not shown) and with which the reciprocating sewing needle 7 cooperates in the well-known manner. The sewing machine may be of the single or two needle type, and the needles of either the oscillating or walking type, or of the non-oscillating or simple vertically reciprocable type.

The improved and simplified stop mechanism, according to the present invention, comprises a bearing bracket '8, which is suitably secured to the rearward or far side of the bed plate 5 and to the right or inward side of the sewing mechanism. Said bearin bracket is provided with longitudinally spaced bearing members 9 and 10 in which is jou-rnaled a rock-shaft 11 extending at right angles to the line of movement of the work fed across the sewing mechanism of the 'machine. Extending through the outer end portion of said rock-shaft 11, at right angles to the axis thereof, and consequently parallel to the line of movement of the work fed across the sewing mechanism of the machine, {is a stop-arm 12, the same having a downwardly pitched free end portion 13, which termi vnates in a downwardly directed stop-finger 14:. Said stop arm 121's adjustable relative to the rock-shaft 11 to properly dispose its stop finger 14 relative to the sewing needle 7; ,a set screw 15 and collar 16 with fasteningscrew 17 being provided to securely hold the stop-arm 12 in the desired position to which it has been adjusted. In order to adj ustably locate the stop-arm 12 to dispose its stopfinger 14 in desired laterally adjacent relation to the sewing needle 7, the bearing member 10 is made in bifurcated form to embrace a collar 18, which is fixed to the rock shaft 11 by a set-screw 19, whereby when the rockshaft is adjusted and the collar 18 secured, longitudinal displacement of the rock shaft the trailing wire sides thereof.

Means are provided for producing positively controlled timed oscillation of the rock-shaft 11 to actuate the stop arm 12 synchronously with each stitch-forming operation of the sewing mechanism, but in such timed relation to the feeding movement of the latter as to operat-ively dispose the stopfinger 14 in fastener arresting position prior to the descent of the needle 7 by which each stitch-forming operatlon is begun, and so as to release or raise said stop-finger from fastener arresting position to permit forward feed-' ing movement of the fastener. The means for so actuating the rock-shaft 11 and stop-arm 12, comprises a lever member 20 fixed on the inner end of said rock-shaft 11, to depend through an opening in the machine bed plate 5. Fixed on and rotated by the drive shaft 6 is a cam member 21 having in one side face thereof a cam groove or raceway 22, said groove or raceway having an inwardly off-set drop section 23 in its circuit. Mounted on a laterally projectingstud 24 fixed to the free end portion of said lever member 20 is a roller 25 which projects into and rides in the cam groove or raceway of said cam member 21. Inasmuch as the drive shaft 6 makes one complete revolution to each stitch forming operation of the sewing Y mechanism driven thereby, it will be obvious that the stop-finger 14 will be positively low-.

cred and raised in proper timed. relation to each stitch-forming operation, respectively by the traversing of the roller 25 relative to the high and low points of the rotated box or raceway cam member. The mode of functioning of the stop-finger 14 relative to fastener elements F fed across the sewing point of the machine is the same as set forth in detail in my afore-mentioned co-pending patent application Serial Number 494,525, filed November th, 1930, and therefore need not be repeated here.

It should be pointed out, however, that due to the positive control exercised by the box or raceway cam disclosed in this application over the lever member and rock-shaft 11, important advantages in the operation of the stop-arm 12 and its stop-finger 14 are gained. These advantages are that the stop-arm is positively held in its lowered active position against accidental upward yielding under and pulling movement of thematerial carrying the fasteners F in either direction, and consequently pressure of a fastener against either the forward or rear side of the stopfinger 14 cannot cause upward displacing movement of said finger, since the cam raceway engages both sides of the roller and positively obstructs any movement of the lever member 20, and consequently the rockshaft '11 and stop arm 12, except that permitted by the drop section 23 of said cam groove or raceway; furthermore, if from any cause it happens that the stop-finger 14 descends upon the wire side of a fastener F, owing to the positive urging of the stop-finger toward the latter which is exercised by the box or raceway cam member, a strong clamping pressure is thereby exercised by the stoparm and its stop-finger which is sufiicient to arrest movement of the fastener and hold the same until the needle 7 descends past the same and enters the material being stitched.

From the standpoint of structure, the provision of the box or raceway cam reduces the entire stop mechanism to greater simplicity, and obviates the requirement of additional stops and adjustments thereof necessary to be used when the rock-shaft and stop arm are spring actuated in one direction. Furthermore, since strong tensional springs for moving the rock-shaft in one direction are eliminated, the operation of the machine is much easier and strains are avoided. This is of marked advantage when utilizing the stop mechanism on high speed power driven sewing machines.

Another advantage of positively and unyieldingly holding the stop-arm and its stopfinger down in active position when the needle is raised, is that the machine operator cannot over-insert fastener material, such as fastener tape, when beginning to sew, since the unyielding lowered stop-finger acts as a gauge to permit only just enough insertion of tape sufiicient to engage the first fastener at its leading end. By reason of this a no inconsiderable saving of tape is accomplished. This advantage will be obvious when it is remembered that in arrangements wherein the stop-arm and finger are spring pressed to active position, it is possible for the operator to raise the, stop-arm to an out of service position when making starting insertions of material, and consequently over insertion of such material is of so frequent occurrence that waste of tape results.

The low part of the cam groove or raceway may be variously dimensioned according to the length of period of stop-arm release desired to be obtained, and, in fact, various modifications of the specific shape of said cam groove or raceway may be made according to the type of sewing mechanism with which the stop mechanism is desired to cooperate.

As other changes could be made in the above construction and apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

Having thus described this invention, I claim 1. In a sewing machine provided with a sewing mechanism including a reciprocating needle, a drive shaft to actuate said sewing mechanism, a rock-shaft, a stop-arm carried by said rock-shaft with its forward end disposed at one side of the machine needle and adapted to be moved into and out of the path of movement of fasteners on material fed to the sewing mechanism, a box cam fixed on said drive shaft, said cam having in a face thereof a cam raceway the major portion of which is concentric to the drive shaft and a minor portion of which forms an inwardly offset drop section functioning to momentarily release said stop-arm and its finger from normal fastener arresting position, and a lever arm fixed to said rock-shaft and having means projected into said cam raceway so as to ride therein, whereby stop-arm positioning oscillations of said rock-shaft are positively controlled in both directions.

2. In a sewing machine provided with a sewing mechanism including a reciprocating needle, a drive shaft to actuate said sewing mechanism, a rock-shaft, a stop-arm carried by said rock-shaft with its forward end disposed at one side of said needle, a stop finger dependent from the forward end of said stop arm and movable into the path of movement of eye fasteners on material fed to said sewing mechanism, said stop finger having its front face in a plane immediately in advance of the path of needle descent, said stop finger also having a cross-sectional area less than that of the interior of said eye fasteners so as to be capable of entering the latter in stopping relation to the trailing wire sides there of at proper times, a box cam fixed on said drive shaft, said cam having in a face thereof a cam raceway the major portion of which is concentric to the drive shaft and a minor portion of which forms an inwardly offset drop section functioning to momentarily release said stop-arm and its finger from normal fastener arresting position, and a lever arm fixed to said rock-shaft and having means projected into said cam raceway so as to ride therein, whereby stop-arm positioning oscillations of said rock-shaft are timed relative to

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