US796622A - Treadle-stand for sewing-machines. - Google Patents

Description

No. 796,622 PATBNTED AUG.8,1905.

E. B. ALLEN. TRBADLB STAND PoR SEWING MACHINES.

AIPLIUATION YILBD HAY 29; 1905.

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No. 796,622. PATENTED AUG. 8,190.5. E. B. ALLEN.

TREADLE STAND FOR SEWING MACHINES.

APPLIGATION FILED MAY 29, 1905. y

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B. B. ALLEN.

TREADLE STAND FOB. SEWING MACHINES.

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UNITED STATES PATENT OEEICE.

EDW'ARD B. ALLEN, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Aug. 8, 1905,

Application filed May 29, 1905. Serial No. 262,738.

To all 10h/0m t mfay concern.

Be it known that I, EDWARD B. ALLEN, a citizen of thc United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Treadle-Stands for Sewing- Machines, of which the following is a speciiication, reference being had therein to the accompanying drawings.

This invention relates particularlv to devices for driving and controlling the operation of that class of buttonhole-stitching machines of which the forward end carrying the stitch-forming and work-holding devices is presented to the operator and the means for actuating the same driven bythe operator are applied at the rear end out of convenient reach of the operator.

The invention has for its object to provide a treadle-stand for such class of buttonholemachines in which a single controlling-lever may be actuated by the operator to open and close the work-holder, start the treadle mechanism in the right direction, and establish operative relation of the machine with the treadle mechanism by actuation of the stop-motion device with which the machine is preferably provided.

In its preferred form the treadle-stand is provid ed with a table or shelf upon which the buttonhole-machine head is secured crosswise and upon the under side of which is supported in suitable bearings a rock-shaft provided at one end with a depending crank-arm, to which is pivotally connected a pawl-lever for temporary engagement with a ratchet-wheel rigidly attached to the usual peripherally-grooved band-wheel of the treadle mechanism and having at its other end an angular controllinglever connected thereto by a transverse pivotal pin, with one arm extended upwardly through a suitable angular slot in the table and provided with a handle and another laterally-extending arm connected at its outer end with the starting-rod of the stop-motion device by means of a suitable fiexible connection. The said rock-shaft is provided also with an upwardly-extending rigid arm having a roller-stud adapted to engage the cam-shaped tail of a rock lever carried by a suitable bracket beneath the table, whose other end is suitably connected with the tail of the workclamp lever for tilting the latter to open and close the work-clamp.

The invention will be understood by reference to the drawings annexed, in which- Fig-ure 1 is a rear side view of a treadlestand carrying a buttonhole cutting and stitching machine head of the Singer type and embodying the present improvements, and Fig. 2 is a plan of the same. Fig. 3 is a detached elevation of thecontrolling-lever with its connections, showing' a portion of the table in transverse section. Fig. 4 is a perspective View of the band-wheel and the controlling devices for the same and the buttonhole-machine. Eig. 5 is a partial sectional elevation representing a portion of the controllinglever withl the adjacent part of the rock-shaft to which it is pivoted.

As represented in the drawings, the treadlestand comprises the standards 1, with intermediate brace 2, in which is journaled the band-wheel shaft 3, supporting the band-wheel 4 and provided with a pair of cranks 5, embraced by the upper ends of a pair of pitmen 6, pivotally connected at the lower ends with pins 7, carried by the independent rocking frames, having the treadle-plates 8 and mounted upon the center screws 9, applied to the brace 2 in a well-known manner. The treadlestand is provided with the usual table or platform 10, upon which is secured the base 11 of a buttonhole cutting and stitching machine having the bed-plate 12 and bracket-arm 13, in which is journaled the main shaft, provided at the rear end with the fast and loose pulleys 14 and 15. The belt 16 from the bandwheelis extended upwardly through suitable apertures in the table 10 to the fast and loose pulleys of the machine, to which it is guided alternately by means of the belt-shifting inger 17, carried by the vibrating stop-motion lever 18, which in practice carries a spring-pressed plunger 18X, adapted to engage a peripheral notch in the cam 19, yieldingly secured to the pulley 14---as illustrated, for instance, in my United States Patent No. 767 ,539, dated August 16, 1904. The lever 18 is provided with a rigid laterally and forwardly extending arm 20, ,to which is pivotally connected the operating-rod 21, passing downwardly through an aperture in the bed-plate and provided with a lateral notch 22, adapted to be engaged by one end of a spring-pressed latch-lever 23, which is tripped at the end of each buttonholestitching operation by well-known means to release the rod 21, and thereby permit the lever 18, under the action of a suitable spring, to assume its initial position, with its plunger in engagement'with the cam 19 and the belt 16 shifted upon the loose pulley 14 for stopping the machine.

As represented in my United States Patent No. 767,540, dated August 16, 1904, the machine is provided with transverse and longitudinal slide-plates 24 and Q5, the latter of which constitutes the lower member of a workholder whose upper member comprises the foot-piece 26, loosely attached by suitable means to the bifurcated forward portion 27 of a clamp-lever which is pivoted to a suitable bracket upon the lower clamp member and has a tail portion 28 slightly overhanging the base 11 of the machine.

Upon the under side of the table 10 is mounted in suitable bearings 29 a rock-shaft 30, carrying at its forward end a fixed bracket-piece 31, to which is pivoted, by means of a pin 32, the angular portion of a bell-crank lever having a lateral arm 33 connected at its outer end by means of a suitable chain or Vcord 34, led upwardly'over the grooved guide-pulley 35 and under the similar' guide-pulley 36 to the operating-rod 2 1 for controlling thestop-lever 18, the other upwardly-extending arm 37 of the bell-crank lever being projected through an L-shaped aperture 38 in the table and provided at its upper end with a handle 39, such lever being maintained yieldingly in normal relation with its supporting rock-shaft by means of a spring 31X, interposed between one end of a recess formed therefor in the bracketpiece 31 and the arm 37 of the bell-crank lever. r1`he shape and position of the aperture 38 are such as to permit the handle 39 to be shift-ed in a direction transversely of the rock-shaft 30 to communicate to the same a rocking motion for purposes which will presently appear or longitudinally of such shaft in order to rock the bell-crank lever thereon for actuating the operating-rod 21 to start the machine.

The rock-shaft 30 is provided at its rearward end with a depending rigid arm40, to the lower end of which is pivoted, by means of the pivotal screw-pin 41, the rearward end of a pawl-lever 42, carrying upon its lower edge, at the middle portion, the pawl 43 and having a spring 44 for maintaining its forward portion normally resting upon a fixed pin 45, projecting from one of the band-wheel hangers 46 to enable the pawl 43 when the shaft 30 is suitably actuated to engage lthe peripheral teeth of a ratchet-wheel 47, rigidly secured to the band-wheel by means of the fastening-screws 48. The free end of the pawl-lever 4Q is provided with a lateral pin 49, which is adapted in the forward movement of such lever to engage the under side of a cam-piece 50, carried at the outer end of a swinging' pawl-lifting arm 51, pivoted, by means of the screw 52, upon the hanger 46 and normally resting upon the supporting-pin 45. As the pawl-lever moves to eXtreme forward position its motion is arrested by the engagement of the pawl 43 with the pin 45 and its piu 49 passes from beneath the cam-piece 50 and permits the latter to drop into initial position, as indicated in Fig. 3, after which the retraction of the pawl-lever by the rocking of the shaft 30 causes its pin 49 to engage the upper side of the cam-piece and to be thereby lifted so as to raise the pawl 43 clear of the teeth of the ratchet-wheel and to avoid the creation of the objectionable noise usually produced by ratchet-and-pawl mechanism.

rlhe rock-shaft 30 is provided with an upwardly-projecting arm 53, having a bifurcated upper end carrying in practice a suitable antifriction-roller mounted upon a pin 54 and adapted to engage the cam-shaped lower edge of an enlargement 55, formed upon one end of a rock-lever 56, mounted upon a pivotal pin 57, supported by a liXed bracket 58 upon the under side of the table 10 and having its opposite end connected, by means'of a suitable chain or cord 59, with the tail portion Q8 of the clamp-lever of the buttonhole-machine. It will be observed that the swinging of the arm 53 by the rocking of the shaft 30 causes the outer end of the former to move along the inclined extremity of the cam-shaped enlargement 55 and to enter the rounded notch therein, which serves to yieldingly hold such arm in initial position, with the lever 56 tilted to maintain the clamp-lever raised for introduction of the material. r1`he rocking of the shaft in a reverse direction serves to disengage the lever 53 from the cam portion 55 and permits the clamp-lever to close under the action of its spring 6() in the usual manner.

From the foregoing description it will be evident that the present improvement is not limited to association only with buttonhole or other machines adapted to produce a group or succession of stitches of predetermined number in a particular pattern, as in a buttonhole or tack, as it is equally applicable to other machines provided with stop-motion devices and having work-holding devices, such as a spring-actuated presser-foot operating in convjunction with the work-plate and drop-feed mechanism in feeding the work in respect of the stitch-forming devices.

Having thus set forth the nature of my invention, what I claim herein is- 1. The combination with a supportingstand, suitable treadle-aetuated driving mechanism with which said stand vis provided, and a sewing-machine mounted upon said stand and provided with a suitable work-holder and with a connection with said treadle mechanism, of mechanism comprising a common operating-lever for opening and closing said work-clamp and for imparting to said treadle mechanism an initial starting movement.

2. rlhe combination with a supportingstand, suitable treadle-actuated driving mechanism with which said stand is provided, and a sewing-machine mounted upon said stand and provided with a suitable work-holder and with a connection with said treadle mechanism including a stop-motion device for rendering said connection alternately operative and inoperative in driving said machine, of mechanism comprising a common operatinglever for opening and closing said work-clamp, for imparting to said treadle mechanism an initial starting movement and for actuating said stop-motion device to bring into operative relation the connection of said sewingmachine with the treadle mechanism.

3. The combination with a supportingstand, suitable treadle-actuated driving mechanism with which said stand is provided, and a sewing-machine mounted upon said stand and provided with a work-holder and with a connection with said treadle mechanism including a stop-motion device for rendering said connection alternately operative and inoperative in driving said machine, of a rock -shaft, ratchet mechanism applied to said treadle mechanism and connected with and actuated by said rock-shaft, means also connected with said rock-shaft for opening and closing said work-clamp, an operating-lever connected with said rock-shaft for rocking the same for operating the ratchet connection with the treadle mechanism and the work-clamp connection, and a connection intermediate said operating-lever and stop-motion device and u, adapted for actuation independently of said rock-shaft for operating said stop-motion device.

4. The combination with a supportingstand, suitable treadle-actuated driving mechanism with which said stand is provided, and a sewing-machine mounted upon said stand and provided with a connection with said treadle mechanism including a stop-motion device for rendering said connection alternately operative and inoperative in driving said machine, of mechanism comprising a common operating-lever adapted to be actuated successively to first impart an initial movement to said treadle mechanism and to thereafter actuate said stop-motion device to bring into operiative relation the connection of said sewingmachine with the treadle mechanism.

5. The combination with a supportingstand, suitable treadle-actuated driving mechanism with which said stand is provided, and a sewing-machine mounted upon said stand and provided with a suitable work-holder and with a connection with said treadle mechanism, of mechanism comprisinga common operrating-lever for opening and closing said workclarnp and imparting to said treadle mechanism an initial starting movement, and means for holding said operating-lever in initial position with the work-clamp open.

6. The combination with a supportingstand, suitable treadle-actuated driving mechanism including a band-wheel shaft mounted in said stand and carrying a band-wheel and a connected ratchet-wheel, and a sewing-machine mounted upon said stand and provided with an operative connection with said treadle mechanism, of a rock-shaft, an arm fixed upon said rock-shaft, a pawl-lever provided with a pawl adapted to engage said ratchet-wheel, a

swinging pawl-lifting lever mounted upon a fixed supporting-pin and adapted to be lifted by said pawl-lever in the forward operative movement and to lift said pawl-lever in the return movement of the latter to disengage it from the ratchet-wheel, and means for actuating said rock-shaft.

7. The combination with a supportingstand, suitable treadle-actuated driving mechanism including a band-wheel shaft mounted in said stand and carrying a band-wheel and a connected ratchet-wheel, and a sewing-machine mounted upon said stand and provided with an operative connection with said treadle mechanism including a stop-motion device for rendering said connection alternately operative and inoperative in driving said machine, of a rock-shaft, an arm iixed upon said rockshaft, a pawl-lever provided with a pawl adapted to engage said ratchet-wheel, a swinging' pawl-lifting lever mounted upon a fixed supporting-pin and adapted to be lifted by said pawl-lever in the forward operative movement and to lift said pawl-lever in the return movement of the latter to disengage it from the ratchet-wheel, an operatinglever pivotally mounted upon a tranverse pin carried by said rock-shaft, and adapted to swing both longitudinally and transversely of the latter, and a connection intermediate said operating-lever and said stop-motion device.

8. The combination with a supportingstand, suitable treadle-actuated driving mechanism including a band-wheel shaft mounted in said stand and carrying a band-wheel and a connected ratchet-wheel, and a sewing-machine mounted upon said stand and provided with an operative connection with said treadle mechanism, of a rock-shaft, an arm fixed upon said rock-shaft, a pawl-lever provided with a pawl adapted to engage said ratchet-wheel, a swinging pawl-lifting lever mounted upon a fixed supporting-pin and provided at its outer end with a laterally-projecting cam-piece, a supporting and guiding pin for normally supporting and guiding the outer ends of said pawl-lever and pawl-lifting lever, a lateral pin upon the outer portion of said pawl-lever and guided in its forward motion by its supporting-pin into engagement with the lower edge of said cam-piece which it serves to raise from initial position and engaging in its return movement the upper operative edge of said cam-piece in the'initial position of the latter to lift the pawl-lever and thereby raise the pawl from contact with said ratchet-wheel, and means for actuating said rock-shaft.

9. The combination with a supportingstand, suitable treadle-actuated driving mechanism including a band-wheel shaft mounted in said stand and carrying a band-wheel and a connected ratchet-Wheel, and a sewing-machine mounted upon said stand and provided with a work-holder including a tilting springpressed clamp-lever and with an operative connection with said treadle mechanism, of a rockshaft, an arm fixed upon said rock-shaft, a pawl-lever provided with a pawl adapted to engage said ratchet-wheel, a second arm fixed upon said rock-shaft, a rock -lever mounted upon a xed fulcrum-pin and having at one end a cam-head adapted for operative engagement with the second-named arm upon said rock-shaft, a connection intermediate said rock-lever and said clamp-lever, and means for actuating said rock-shaft whereby a single movement of the same serves to impart an initial movement to said band-wheel and to effect the closing of said work-clamp.

l0. The combination with a supportingstand, suitable treadle-actuated driving mechanism including a band-wheel shaft mounted in said stand. and carrying a band-Wheel and a connected ratchet-wheel, and a sewing-machine mounted upon said stand and provided with a work-holder including a tilting springpressed clamp-lever and with an operativer..

connection with said treadle mechanism, of a rock-shaft, an arm iixed upon said rock-shaft, a pawl-lever provided with a pawl adapted to engage said ratchet-wheel, a second arm fixed upon said rock-shaft, a rock-lever mounted upon a fixed fulcrum-pin and having at one end a cam-head formed with an inclined operative portion and an adjacent notch or recess which the outer end of the second-named arm upon said rock-shaft is adapted to engage successively, a connection .intermediate said rock-lever and said clamp-lever, and means for actuating said rock-shaft whereby a single movement of the same serves to impart an initial movement to said band-wheel and to y effect the closing of said Work-clamp.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWARD B. ALLEN.

Witnesses:

ALFRED C. DARLnvG,` H. A. KORNEMANN.

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