US1237245A

US1237245A - Presser-foot mechanism for sewing-machines.

Info

Publication number: US1237245A
Application number: US73521312A
Authority: US
Inventors: George A Dobyne; Stephen A Dobyne
Original assignee: CHAMPION SHOE MACHINERY CO
Current assignee: CHAMPION SHOE MACHINERY CO
Priority date: 1912-12-06
Filing date: 1912-12-06
Publication date: 1917-08-14
Anticipated expiration: 1934-08-14

Description

G. A. III S. A. DOBYNE.

PRESSER FOOT MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DEC.6, I9I2.

1,237,245. Patented Aug. 14,1917. Y

' 3 SHEETSSHEET I.

a. A. a s. A. DOBYNE. PRESSER FOOT MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DEC.6| 1912.

1 37,245, Patented Aug. 14, 1917.

3 SHEETS-SHEET 2.

@zdafiway, v W A g 61 Al A PRESSER FOOT MECHANISM FOR SEWING MACHINES. APPLICATION FILED DEC.6- 1912- 1,237,245 Patented Aug. 14, 1917.

3 SHEETSSHEET 3.

CHAMPION SBEOE MACHINEBY OF MISSOURI.

rnEssnn-roor mncnmsm ron. same-racemes.

Application filed December 6,1912. ser alnaisaei's.

To all whom it may concern:

Be it known that we, GEORGE A. DQBYNE and STEPHEN A. DOBYNE,.b0th; citizens of the United States, and residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Presser-Foot Mechanism for Sewing:Machines, of which the-following is a specification. 1 This invention relates to sole-sewing ma chines of the general'type described in Pat ent No. 473,870,. dated April 26, 1892, and more particularly, to presserfoot 1 mechanism therefor. v A In sole-sewing machines the work is sup ported upon a work support or table and is held in place by a movable presser foot. The Presser-foot is held down on the work by the pressure of a light spring, and the pressure of this spring is increased at 1ntervals and the resser-foot is locked in the position of increased pressure. Durlng the feed of the work the increased pressure is relieved and the Presser-foot is unlocked. It

is desirable that the presser-foot be raised ermit removal of the e done at a time when from the work to work and this must the awland needle are out of the work andwhen the thread controlling mechanism is v in position to release the thread so as to permit it to be drawn. j

One of the objects of this invention there-.

"fore'is to construct amachine in which the Presser-foot can be raised from the work with a minimum amount of time and labor.-

Another object'is to so construct the machine that the presser-foot is raised auto matically when the machine is placed in position to permit removal of'the work, and to so interconnect this, resser-foot mech-' anism with the stitch-forming and thread controlling mechanisms. that these mechanisms may be simultaneously placed in position to permit removal of the work.

Another object is to retain the presserfoot in raised position and to provide means whereby this presser-foot can be readily moved down on the work. q

Further objects will appear from the detail description taken in connection with the accompanying drawings in which:

Figure 1 is a front elevation ofa machine tmbodying this invention,

withand this arm 9 designates a machinehead and 10 a drive shaft having mounted thereon a hand wheel- 11 and cam wheels 12,13'and 14. "A work vsupport or table 15 .is mounted upon the machine head and has cooperating therewith a resser-foot 16. The stitch-formin mechanism comprising an awl 17,. a need e18, a looper 19 and a shuttle 20 may be of a construction substantially as described in the above patent.

The thread controlling mechanism may be of any suitable construction, but as shown is of theconstruction shown and described in our application Serial No. 735,212, filed of even date herewith. The cam wheel 14 is provided with a cam groove cooperating with a. cam roll 21 on an arm 22 mounted on a rock shaft 23, which rock shaft has .24 thereon connected-bya link 25 to an an arm arm 26 on a take-up shaft .27 extending across the machine. This take-up shaft has mounted thereon a take-up lever 28 cooperating with a tension 29. As described in the above application, the thread tension is unlocked 1 when the take-up is at its lower limit, so that the thread'm'ay be drawn at this time.

head. The-presser-foot has a rearwardly extending arm 32 rigidly connected there- 'is engaged by alight spring, 33 mountedon the machine head,

force the presserwhich spring operates to foot down and against the ;work on the work support with a normally light pressure. An arm 34 loosely mounted on the Presser-foot 16 is mounted'on a rock" 4 shaft 30 supported in the machine head and I 1n a bracket" 31 mountedcnthe machine I GEORGE A. .DOIBYNE AND STEPHEN A. DOBYNE, OF ST. LOUIS, MISSO' UBI, ASSIGNORS TO COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION Specification of tetters Patent. Patented Aug. "1917. v

2 but;.sh owing the rock shaft 30 is yieldin'gly connected with the arm 32 by a link 35 and a sprin 36. Alever 37 is provided with a cam ro 38 engaging a cam groove 39 in the cam wheel 13, and this lever 37 has a pawl 40 engaging a toothed rack 41 on the 42 mounted on the machine head engages a toothed rack 43 on the arm 32. A pin 44 on the machine head engagesand trips the arm 34. A pawlpawl 40, and a lug 45 on the lever 37 engages and trips the pawl 42. The cam groove 39 is provided with

cam portions

46 and 47 which operate to depress the lever 37. The above construction is substantially as shown and described in the above patent and its operation is well known. During the operation of the machine the presserfoot is normally held against the work on the work support under the tension of the light spring 33, the cam 39 operates to increase the pressure due to the spring 33 at intervals, and the pawl 42 operates to lock the presser-foot in its position of increased pressure. When the

cam portions

46 and 47 are in engagement with the cam roll the presser-foot is relieved of the increased pressure'and unlocked as shown in Fig. 3, the cam portion 46 operating during the feed of the work and the cam portion 47 operating at the time when the work is to be removed. In this construction, however, the length of the cam portion 47 is long as compared to the corresponding cam portion in the patent so as to permit revolution of the drive shaft through a considerable angle while this cam portion is operating.

A link or arm 50 is pivotally connected to the arm 32 at 51 so as to permit this link to swing onthe arm. A spring 52 connected at one end of" the link 50 and at the other end to a projection .53 on the bracket 31 tends to move this lever to the left Figs. 2, 3 and 4. A block 54 is pivoted at 55 on the link, and this link is provided with a pin 56 engaging a slot in the block so as to limit the pivotal movement of this block in a counterclockwise direction. The spring 52 normally tends to hold the block 54 in engagement with a circumferential shoulder 57 on the cam wheel 13. This shoulder 57 has formed thereon a beveled tooth 58. The presser-foot has mounted thereon an arm 59 forming a handle whereby this presser-foot may be raised. A lever 60 pivoted on the handle is provided with a hook 61 adapted to snap behind a lug or keeper 62 on the machine head, and with a handle 63. A. spring 64 positioned between. the

handles

59 and 63 normally operates to move the hook 61 down.

The machine normally rotates in the direction of the arrow Fig. 2. During the operation of the machine when rotating in this direction the tooth 58 will merely snap over the block 54 and move the link 50 on its pivot 51 without operating the presser-foot. When however, the machine is stopped and the presser-foot is to be raised, the operator will first move the drive shaft forward in the direction of the arrow Fig. 2 until he hears the block 54 snap over the tooth 58. He will then rotate the shaft backward in the direction of the arrow Fig. 3. This will cause the shoulder of gagcment with the tooth.

pr=.'sser-fo0t is moved to raised mamas the tooth 58 to engage the block 54 and move the link 50 down and in the direction of its length so as to move the arm 32 down. and raise the presser-foot. It will be noted that when the tooth 58 is in a position to engage the block 54 the cam portion 47 is in position to engage the cam roll 38 so as to relieve the presser-foot. of the increased pressure and to unlock the same, and the parts are so constructed and arranged that the presser-foot will be relieved and un locked just before the tooth 58 starts to engage the block 54 to raise the presser-footl When the presser-foot is raised the arm 59 will move with it and the hook 61 will snap over the lug 62 so as to lock the presser-foot in raised position as shown in Fig. 3. If the shaft 10 is now rotated farther in the direction of the arrow Figs. 3 and 4, the link 50 will move down still farther and as this link is moved down the engagement of the lower end or heel of the block 54 with the shoulder 57, whichacts as a cam, will cause the link 50 to be swun backward still more until the toe of the %lock moves out of engagement with the tooth as shown in Fig. 4. The spring 33, which has been placed under tension, will now operate to raise the arm 32 and lever 50 and cause the block 54 to slide over the tooth 58 so that the block will pass completely out of entherefore be rotated freely while the presserfoot will be locked in raised position by the locking means on the handle 59. When the machine is 'again' to' be started the presserfoot can be dropped on the work by merely grasping the handles Y59 and 63 and releasing the hook 61 from the lug 62.

The parts are so arranged that when the position the awl and needle will be out of the work, the take-up will be down to its lower limit, and the thread tension will be unlocked to unlock the thread. The presser-foot, stitch-forming, and thread controlling mechanisms are therefore in position to permit removal of the work with the last stitch completed.

It will thus be seen that the invention accomplishes its objects. The operator can raise the presser-foot and place the machine in position to permit removal of the work by merely reversing the drive shaft, and when the presser-foot is raised it is locked in raised position against the tension of its spring. The presscr-foot is raised automatically when the thread controlling mechanism and the stitch forming mechanism are placed in a position to permit removal of the work, and the presser-foot mechanism becomes disconnected from the shaft after it is raised and locked in position, so that the drive shaft may be moved at pleasure.

The presser-foot raising mechanism has a connection to the presser-foot independent The shaft may 'ments of the machine.

of the pressure increasing and lockingmeans.

The presser-foot when raised is therefore independentof its pressure increasing and locking means and the drive shaft can there'- fore be operated to independently position 1 the other instrumentalitiesof the machine. The resser-foot may be lowered at any time by operating the handle thereon irrespective of the positions of the other ele- It is obvious that various changes may be .made in the details of construction Without is claimedis:

departing from the spirit of this invention,

and it is therefore to be understood that this invention is not to be-limited to the specific construction shown and described.

I Having thus described the invention what ,1. In a sole-sewing machine, the combination with a Work support, of a movable resser-foot when the ressure has been inmeans independent of said'raising means for locking said resser-foot in raised position 2. In a sole-sewing machine, the combin a. tion with a'drive shaft, of a work support,

a movable resser-foot, means to force said resser-foot against the work on the Work .sure has been irgg' e ased, and means operated -support with a normally light Pressure, :85

means toincrease said pressure at intervals and to lock said presser-foot when the presupon reversal of said shaft for raising the presser-foot and means independent of said 4o in raised position.

raising'means for locking said resser-foot 3. In a sole-sewing machine, the combination with a drive shaft, a work support and a resser-foot, of means operated upon rcversal of said shaft for separating said tion with a drive-shaft, a worlr presser-foot and work support, and means I 7 independent of said driving shaft for locking said parts in separated position.

4. Ina sole-sewing machine, the combination with a drive-shaft,'a work support and a movable presser-foot, of operating means operated upon, reversal of said shaft for raising said presser-foot, said operating means being constructed and "arranged to become- 7 disconnected from said shaft after said Presser-foot is raised, and constructed to leave 'said resser-foot in raised position, and means for locking said resser-foot in raised position.

5. In a sole-sewing machine the combinasupport and a movablepresser-foot, ofoperating means,

inoperative Whensaid drive shaft moves inits normal direction, but operated upon reversal ofsaid shaftfor raising said presser-v foot, said operating means being constructed and arranged to become disconnected from [said shaft after said'presser foot "is raised,

and constructed to leave said resser-foot in Y I raised position, and means for locking said resser-foot 1n raised position.

6.- In-a sole-sewing machine, the c'ombina a movable presser-foot, of a spring for moving said presser-foot toward said work sup- 1 port, a member connected with said presser- Y 001;, operating means on said shaft ention with a drive-shaft, a work support and gaging said member upon reversal of said. I

shaft, constructed and arranged tov raise said presserrfoot and thereafter become disconnected from said member, and means for 1 locking said presser-foot in a raised position.

whereof we afix our a- In testimony tures in presence of two witnesses;

GEORGE A. noBYNE;

s'rEPH uanonYNE;

Witnesses:

L. F. MAHLER, J .j H. BRUNINGA.