US1171466A - Sewing-machine. - Google Patents

Description

A.|1. SCHUENKY.'

SEWING MACHINE.

. APPLICATION FILED MAY 31. 1913.

1,171,466.. Patented Feb.15,1916.

2 SHEETS-SHEET ll.

25 e@ 9 60 52 2 65 0j/ ZZ 75 I', n I ig 65 'J 2g y 75 l? A e5 I l E-wev-doz;

Row/)I A. R. SCHOENKY.

SEWING MACHINE.

APILLCATION` FILED MAY 3l. I9I3. 1,171,466. Patented Feb.15,1916.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

AUGUST B. SCHOENKY, OF SOMEBVILLE, MASSACHUSETTS, ASSIGNOR TO SHOE' MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION 0F MAINE.

THE manenk SEWING-MACHINE.

Speeication of Letters Patent. I

Original application led September 25, 1912, Serial No. 722,300. Divided and `this application illed May 31, 1913. Serial No. 771,000i.

To all whom it may concern welt system, whereby the outsole and welt are sewed together. Other examples of that type of machine which may be referred to for the purpose of supplying details that are omitted herefrom, are illustrated in my prior Patent No. 1,071,355, dated August 26, 1913, and application No. 722,300, filed September 25, 1912, of which last mentioned application this present application is a division.

An object of the present invention is to generally improve the.construction andoperation of sewing machines of all classes,I

such for example, as the sole sewing machines of the type referred to.

Another object hereof is to improve the presser foot mechanism so as to permit the lifting of the presser foot at will, by means of a lever or treadle in a more eiiicient and convenient manner, less injurious to the mechanism than heretofore.

Other objects and advantages pertaining to the present .invention will appear in the hereinafter following description, or will be apparent to those skilled inthe art.

To the attainment of such objects and advantages, the present invention consists in the novel combinations, arrangements, devices and parts set forth, described and illustrated in the following description and accompanying drawings.

I will first describe one form of machine embodying my improvements and will thereafter point out the novel features in the claims. f

In the accompanying drawings forming a part hereof, Figure 1 is a right-hand elevation of certain details, including the presserfoot lifting mechanism,- taken in section on the plane 4.-4 of Fig. 1, of application 722,300, the parts being shown in initial position. Fig. 2 is a vien7 similar to Fig. 1, but

in a position with the presser-foot treadle or lever partly depressed. Fig. 3 is a similar view, withthe parts in a position with the treadle fully depressed. Fig. 4 is a similar View showing the parts in position for the automatic release of the work beneath the presser-foot, which occurs during the formatlon of each stitch. Figs. 5, 6, 7 and 8 `represent details of certain parts shown in Figs.

Similar reference numerals'designate corresponding parts in the several figures of the drawings.

I will refer now'by reference numerals to the machine parts illustrated in the accompanymg drawings.

Extending upwardly from any 4convenient base is the post 1, supporting at its upper end the head, or casting, 2, which will be of a complicated structure unnecessary to describe, it affording `support for various of the workingor non-working machine parts hereinafter to be referred to. The. main shaft 3 runs in the upper part of the machine, 4extending from left to right, and supported in bearings or brackets. At the left end of the shaft 3, is a pulley, which may be engaged by a belt for driving the machine. The main shaft may carry a number of cam disks including cam disk 7 shown lin the figures. This cam disk at its right-hand side contains a cam 36 for automatically operating the presser-foot during each stitch, imposing upon it an additional pressure, and periodically releasing it during feeding.

The manner of feeding, the manipulation of the thread, the vvarious operating connections and lother parts of the machine may be substantially as in said priorl applications.

I will now describe the operative connec-l tions whereby the cam or groove 36 in the cam disk 7 effects the automatic operation of the presser-foot 23. Particular reference is made to Figs. 1 and 4. The presser-foot 23 is carried at the forward end of presserfoot arm 66, capable of swinging about a fixed stud 67 and having ay rear extension or 7 4: projecting therefroi'n,I to which secured foot may be effected through a toothed rack 76, on the spring extension or arm 69, a dog 77 enga-ging said rack, a toothed rack 78 onl the arm 68, and a triple d0g79 engaging` the rack 78. There is shown a spring 80, pressing dog 77 to rack 7 6, and a triple spring 8l, pressing the components of the triple dog 79 into contact with rack 78. t

The presser-foot operating lever 82, pivoted at the rear, as shown, possesses a stud 83, which engages the cam groove 36. The forward end of the operating arm 82 has the dog 77, already referred to, pivoted upon it, and carries the spring 80 therefor. The arm 82 also has a projection or heel, 84, shaped and located at proper times to kick and thereby disengage the triple dog 79. This operation occurs when the operating arm 82 descends, and at such time the dog 77 is also disengaged from its rack through a fixed pin 85, located to contact and throw open the dog 77.

The operation of the mechanism thus described may` be as follows: `During the formation of each stitch the work must be released for a suiicient time to permit its feeding, and when the` feeding is completed the work is to be again clamped and firmlyv held under heavy pressure during the vari- 75. When the stud, 83, passes out of the short concentric portion, it is lifted, with the result that the dog, 77 engages the rack, 76, to elevate the spring arm, 69, and thereby imposes the force of the powerful spring 70, upon the presser-foot, while at the same time, the triple dog, 79, having a fixed pivot is thrown into engagement withl the rack 78, thereby positively locking the presserfoot in its depressed position.

In order to enable the presser-foot to be lifted at any `desired stage of operation, .I

have provided the following improved mechanism: The vertical rod, 86, will be adapted at its lower end to be depressed by a lever or treadle at the will-of the operator.

Livres@ and 6, adapted when the treadleis lowered to Contact the arm 72 and depress it, thus raising the'` presser-foot. Manifestly, the presser-foot cannot be raised while under heavy pressure without first disengaging the dogs. Loose on the short shaft 73, is a toothed plate, 89. This coperates with the treadle rod by its pivot connection therewith as shown, so that the plate, 89, guides or directs the treadle rod in its up-and-down movements, while the treadle rod eects oscillations of the plate 89. Coperative with the toothed' plate, 89, is a secondA toothed plate, 90, the latter being loose upon the stud shaft of the triple dog. Each of thelplates 89, 90, is shown as having two teeth, capable of mutually engaging. The triple dog, 79, is provided with a pin 91, for opening it, this pin lbeing ,for convenience secured to the middle member and adapted to contact the other two members of the dog, as shown in Figs. 7 and 8, the pin, 91, also projecting leftwise beyond the dog, as seen in Fig. 8, so as to stand in the path of the toothed plate 90. The plate 90 has an upwardly extending portion which is centrally notched to accommodate the fixed pin 85. The portion of the plate below the notch is adapted to strike the pin.

91 (see Figs.. 10 and 11) for disengaging the triple dog 79. The upper portion 92 of the extension plate 90 is adapted to strike aL pin 93 for effecting the opening of the dog The operation of the mechanism thus described xnay Ibe as follows: llt will be noticed that the projection 88 onthe treadle rod head .isfnor'mally spaced considerably above thearm 72, so as not to come in contact with the latter for actuating it to raise the presser-foot until the dogs have' been released.` Asis clear in Fig. 5, the depression of the treadle rod first eHects a swingving of the toothedplate 89, which, being engaged with the toothed plate 90, swings the latter in a right-hand direction, or toward the rear of the machine. By this action, the pla-te 90 immediately strikes the `pin 91, and also the pin 93, thereby disengaging both of the dogs 77 and 79. The continued depression of the treadle rod brings projection 88 into contact with arm 72, thereby pulling down the link 71 and raising the presser-foot. As 'will be seen in Fig. 5, the toothed plates 89 and 90 are so shaped that the teeth will disengage after a Ibrief movement, whereby further depression of the treadle will not further actuate the plate 90. The plate 90 therefore serves to disengage the dogs and then comes to rest. This is of very great advantage, for the reason that if the movement of disengagement should lbe continued throughout the entire depression of the treadle rod, an excessive and unnecessary displacement and strain upon the dogs and their springs would be caused; `With the mechanism shown, the dogs are only actuated sufficiently to disengage them, and the concentricarc.-

shaped portion of the plate 89 thereupon during the further depression of thetreadle,

locks the plate 90 in dog-disengaging posi tion. The subsequent raising of the treadle rod causes first a mere swinging of plate 89, followed 'by an engagement of its teeth with the teeth of plate 90, thereby restoring both plates to the normal position shown in Figs. 4 and 5.

It will thus be seen that there has been described a presser-foot mechanism embodying the principles and attaining the objects andV support, a dog and rack mechanism for intermittently locking the foot underv heavy pressure upon the work, a dog disengager adapted to be positively moved into a position for disengaging the dog from the rack and to be locked in such position, and a shiftable part or treadle having connections whereby the movement of the treadle' acts first to move the disengager -to aposition'j to disengage the dog, and then to lock vsuch Y disengager in such position, and then tof] lift the foot while the disengager remains stationary. ,l

2. In a sewing machine the combination of a Work support, -a movable presser-foot adapted to bear upon the work upon the support, a dog and rack mechanism for intermittently locking the footunder heavy pressure upon the work, a dogdisengager adapted to be positively moved into a posi-v tion for disengaging the dog from the rack and to be locked in such, position, and a `shiftable part or treadle having 'connections whereby the operative movement of the treadle acts first to move the disengager to a position to disengage.' the dog, and then to lock such disengager in such position, and then to.1ift the foot while the disengager remains stationary, while the returnl move- .ment of the treadle restores the presser-foot before restoring the disengager to rengage the dog and rack. I 'l L 3. Inn a sewing machine the combination of a work support, a movable presser-foot adapted to `bear upon the work upon the support, a dog and rack mechanism for intermittently locking the foot under heavy pressure upon the work, a dog disengager such asl the plate 90 fitted for swinging movement only and adapted to be positively Vswung toward the dog into a position for disengaging the dog from the rack and to be locked in such osition, and a shiftable part or treadle having connections whereby the movement of the treadle operates first to swing the disengager to a 'position to disengage the dog, and then to, lock such disengager in such position, and-"thenlgto lift the ,foot while the disengager 'remains Stm l tionary;

4.5 In a sewlng machine thejcombination of a movable work-engaging member, a lockl ing device therefor, a movable disengager adapted to swing for unlocking said device, and a shiftable part or treadlehaving con.- nections acting in its operative movement for first moving said disengager toa positionl to unlock said device, then locking said disengager stationarily in such position, and thereafter during the further movement of said part or treadle retractig said work engaginghmember from the work while the disengager is locked, in position to hold said device: unlocked; the reverse movement of said' part or treadle acting to first restore the work engaging member before restoring-the disengager to permit the relooking of saidv device. 4 5. In a sewing machine the combination A,of a presser-foot adapted to be lifted and lowered and during stitching to be locked under pressure and unlocked, a swinging presser-foot lever, a locking device coperating with said lever for intermittently lock-v ing the presser-foot, a disengager ada ted to be movedto a position to unlock-sai device a nd to be itself .locked in such position, a controlling part or shiftable treadle -normally unconnected with said lever so as not,

to partake of i s stitching movements, connections actuab e from said treadle during n i the first part of vthe treadles shifting for lmoving said disengager to unloclr said device and f or'lockingsaid disengager in such position, and other connections actuablc Iby the continued treadle shifting movement for lifting said presser-foot after the unlocking of said device.

' In testimony whereof I afiiX my signature' in presence ofl two witnesses.

. v AUGUST R. SCHOENKY.

Witnesses:

J.WARREN NICHOLS,

. Tnoms J. Cairn',A

Images