US973237A

US973237A - Presser-foot mechanism for stitching-machines.

Info

Publication number: US973237A
Application number: US49574109A
Authority: US
Inventors: Bruno H Theisen; George S Keller
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-05-13
Filing date: 1909-05-13
Publication date: 1910-10-18
Anticipated expiration: 1927-10-18

Description

B. H. THEISEN & G. S. KELLER. PRESSBR FOOT MECHANISM FOR STITGHING MACHINES.

APPLICATION FILED MAY 13. 1909.

973,237, Patented Oct. 18, 1910.

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BBUNO H. THEISEN AND GEORGE S. KELLER, OE MINNEAPOLIS, MINNESOTA.

PBESSEB-FOOT MECHANISM FOR STITCHING-MACHINES.

Specification of Letters iatent. V Patented Oct. 18, 1910.

Applicafioaflled May'13, 1909. Serial in. 995,741.

To all whom it may concern:

Be it known that we, BRUNO H.,THEISEN and GEORGE S. KELLER, both of Minneapolis, Hennepin county, Minnesota, have invented certain new and useful Improvements in Presser-Foot Mechanisms for Stitching-Machines, of which the following is a specification.

The object of our invention is to provide means for holding the material to be stitched securely on the work plate during the o ration of punching the hole therein and 01ming t-hestitch.

A further object is to provide means, which will adjust themselves automatically to the varying thicknesses of. the material that is to be worked on.

Our invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure 1 is a front view of a stitching machine, embodyin our invention, Fig. 2 1s a side view partialy in section, of the same, Fig. 3 is an enlarged, detail view, illustrating the presser oot mechanism.

In the drawing,2 represents a work support and 3 a presser foot mounted on a lever 4 that is loosel supported on the shaft 5 and ca able 02 vertical oscillation inde-" endent y thereof. The end of the presser oot is, directly above the work support, in position to enga e and hold the material securely thereon. he lever 4 is provided with alaterally turned end-6, which projects over an arm 7 that is loosely mounted on a shaft 8 between the standards 9 of the machine and said arm has a curved rack barlO at one 13 and is normally pressed toward the rac bar 10 b a spring 14. The arm 7 by en-- gaging the laterall turned end 6, tends to raise that end of t e lever and de ress the presser foot. A spring 15 norma ly holds the arm 7 in yieldm engagement with the end 6. A secondary dever 16 is mounted on the shaft 8 and has an end adapted to enga e the under side of the lever 4 and is hel d in contact therewith by a'spring 17. This spring has considerable tension and the lever 16 is held firmly thereby a ainst the lever 4 and the presser foot locke securely in engagement with the material to be stitched. The lever 16 has a lug 18 projectmg therefrom on one side into the path of the oscillating needle jaw 19, which is actu ated from the crank shaft 20 through a connecting rod 21. When the jaw has deseended to a predetermined position, it will engage the lug l8 and tilt the lever 16 to the position shown in Fig. 2, relieving the pressure on the lever 4 and allowing the presser foot to be released when the lever 12 is disen' aged from the rack bar 10. To automatiearly 0 erate this lever 12,,we prefer to provide a ug 22 on the upright rocking post 23, which is actuated through the engagement of the depending bracket 24 with the cam 25 on the s aft 20 and sup orts an arm 26 through the operation of w ich, the awl carrying' jaw 27 1s oscillated to feed the oods.

An adjusting screw 28 is mounted in t e lug 22 in position to engage the edge of the lever 12 and at a predeterminedfpoint in the operation of the machine, diseng e the said lever from the rack bar 10 an allow the arm 7 to swing downward and release the presser foot. A spring 29 normally resses the arm 26 away from the awl jaw an holds the screw 28 out of the path of the lever 12.

The 0 eration of the mechanism is so timed that tl ie oscillation of the post 23, the movement of the arm 26 and the lateral stroke of the jaw 27 throu h its engagement with said arm will take ace just at the time when the awl is comp ieting its upward movement, so that the oscillation of the aw 27 will move the awl laterally in the work plate and feed the material forward. This awl feed however, forms the subject matter of a separate application andv is not claimed herein.

The mechanism last described in connection with the presser foot, will, as indicatedin Fig.2, be actuated also to release the presser foot, just at the time it is desiredto make the feed.

The ratchet device in connection with the arm 7 and the lever 4 allows the presser foot to adjust itself to difli'erent thicknesses of material.' For-instance, if the lever 12 be adjusted for a certain thickness ofmaterial and during the operation of the machine, a thinner portion 0 to be stitched, the ratchet bar will slide .up- Wardly onthe tooth 11 actuated by its spring and tilt the lever 4 and force the presser foot downwardly to kee it constantly in engagement with the sur ace of the'material.

the material is fed along ried by said If the material grows thicker as the feed progresses, the operator may grasp the handle 13, disengage the lever from the ratchet bar and allow the presser foot to adjust itself to the variation. Generally however, the lever 12 will be automatically tripped just before the feeding operation to allow the presser foot to accommodate itself to the thickness of the material.

We claim as our invention 1. In astitching machine, the combina-' tion, with a work support, a needle jaw and an awl jaw, of a pivoted lever, a presser foot mounted thereon, a spring pressed arm arranged to engage said lever and having a series of ratchet teeth, a trip lever having a tooth to engage said ratchet teeth and normally locking said arm in engagement with said lever, meansfor operating said awl jaw to feed the goods and adjustable means caroperating means and arranged to engage sai -.trip ever and release said arm, substantially as described. I V

2. In a'stitching machine, the combination, with a work support, a needle jaw, and an awl jaw, of a pivoted lever, a presser foot mounted thereon, said lever havlng a laterally extending end, a pivoted spring-pressed arm having a U-shaped recess to receive and loosely support said laterally extending end and hold said presser foot toward said work support With-a yielding pressure, said arm having a series of ratchet teeth thereon, and a trip lever having a tooth to engage said teeth, said arm slipping automatically over saidtooth to increase the pressure of said foot on said plate but being normally locked by said tooth against movement in the other direction.

3. The combination, with a work support, a needle jaw and an awl jaw of a presser foot lever, a resser foot carried thereby, a spring-presse arm having a series of teeth, and a part to engage said presser foot lever a trip lever having a tooth to engage sai ratchet teeth and normally lock sald arm m engagement with said presser foot lever, said arm slipping automatically over the tooth of said trip lever and permitting the presser foot to accommodate itself to the varying thickness of the material, and means actuated by said needle jaw for releasing the pressure of said presser foot lever at a re- 7 determined point, substantially as 'descri ed.

4. In a stitching machine, the combination, with a reciprocating needle jaw and anawl jaw, and means for operating the same, of a work support, a presser foot lever, a presser foot mounted thereon, a springpressed ratchet arm arranged to engage 881d .presser foot lever and havin ,a series of ratchet teeth, as ring-presse tripp' lever having avtoot to engage the of said ratchet arm, a s ring-pressed lever arranged to engage sai presser foot lever and 'to advance the material and actuate said tripping lever todisengage it from the teeth of said ratchet arm whereby said presser foot will be released during the feeding operation, substantially as described.

5. In a stitching machine, the combination, with'a work support, a needle jaw and an awl jaw, of a presser foot lever, a presser foot mountedthereon, an arm arranged to engage said lever and havinga series of ratchet teeth, a trip lever having a tooth to engage said teeth and permit said arm to move automatically in one direction, but locking it against movement in the other direction, an actuating means for said awl jaw, and'means adjustably mounted in said actuating means and arranged to engage and trip said trip lever at a predetermined point,

substantially as described.

6. In a stitching machine, the combination, with a work support and a needle jaw and an awl jaw, of a pivoted lever, a presser foot carried thereby, a spring-pressed arm arranged to engage said lever having a series of ratchet teeth, a trip lever having a tooth to engage said ratchet teeth, a secondary lever arranged to engage said presser foot lever and lock the resser foot in engage.- ment with the material, and said needle jaw having means for moving said secondary lever out of engagement with said presser foot lever.

7. In a stitching machine, the combination, iwth a work support, an awl jaw and a needle jaw, of a pivoted lever, a presser foot carried thereby, an arm having ratchet teeth and arranged to engage said presser foot lever, means for adjusting said arm to accommodate said presser foot to the thickness of the material, a secondary lever arranged having a lug projecting into the path of said u 8. n a stitching machine, the combina tion, with a work support, a needlejaw and an awl jaw, of a pivoted lever,a presser foot mounted thereon, a spring-pressed arm arranged to hold said presser foot toward sai work plate with a yieldin pressure, said arm having a series of rate et teeth, a trip lever having a tooth to engage said teeth, said ratchet arm slipping automatically over said tooth to increase the pressure of said foot on said plate, but being locked normally by said tooth against movement in the other direction, a rotating post having apart to engage and, actuate said awl jaw and means carried by said post to engage and operate said tr1 lever.

" 9.'In a stitching machine, the combination, with a work support a needle jaw and an awl jaw, of a pivoted lever, a presser foot mounted thereon, a spring pressed arm arranged to hold .said presser foot toward said work plate witha ielding pressure, a trip lever having a'ratchet connection with said arm and normally locking it againstmovement in one direction, a secondary lever arranged to lock said presser foot lever in its working position, said secondary lever being in the path of said needle jaw to be actuated thereby, and an awl jaw 0 crating means hav' a part to actuate said trip lever, substantia ly as described.

10. In a stitching machine, the combination, with a work support and a needle jaw, of a presser foot lever, a presser foot mounted thereon, a mechanism arranged to lock said presser foot lever but permit it to accommodate itself to the varying thickness of the material, and means actuated by said needle jaw for releasin said presser foot lever at a predetermine point said means including a secondary lever disposed in the path of said jaw.

11. The combination, with a work support, a needle jaw and an awl jaw, of a presser foot lever, a resser foot carried thereby,aspring-presse arm havin aseries of teeth, and a part to e sai presser foot lever, a trip lever ha a tooth to engage said ratchet teeth and normally lock said arm, means including a rotating post for actuati said awl jaw, and means carried by sai actuating means for moving said trip lever to release said arm, substantially as described.

12. In a stitchin machine, a needle jaw in combination wit a presser foot mechanism comprising a presser foot lever and means arranged to engage said lever to raise the same and depress the presser foot, a trip lever having a part to contact with said engaging means, and means actuated by the movement of the needle jaw for releasin said presser foot lever.

13. n a stltching machine a needlejaw in combination with a presser foot mechanism comprising a presser foot lever and presser foot carried thereby, adjustable means engaging said lever and permitting it to accommodate itself to the thickness of the material, a secondary lever arranged to engage said presser foot lever and lock it in 1ts working position, said secondar lever being actuated by the movement 0 the needle aw. 1 In witness whereof, we have hereunto set our hands this 24th day of April 1909.

\ BRUNO H. THEISEN. GEORGE S. KELLER.

Witnesses:

Jnssm M. SULLIVAN, J; A. Bmo'rox.