US1437450A - Driving and stopping mechanism - Google Patents

Description

A. R. SCHOENKY.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED .IULYZB, 1919- I Patented. Dec. 5, 1922.

5 SHEETSSHEET I.

V fin er-0%;

A. R. SCHOENKY.

\3 AND STOPPING MECHANlSM.

APPLICATION FILED JULY28,1919.

DRIVI Patemed Dec. 5, 19223,

5 SHEETS-SHEET 2.

2 J @U VWW 2 ww A. R. SCHOENKY.

DRIVING AND STOPPING MECHANiSM.

APPLICATION FILED .IULY28, I919.

Patented Dec. 5, 1922..

5 SHEETS-SHEET 3.

A. R. SCHOENKY.

DRIVING AND STOPPING MECHANISM.

APPLICATION FILED JULY 28. 1919.

1,4873%0. Patented. Dec. 5,1922.

5 SHEETS-SHEET 4.

A. R. SCHOENKY.

DRIVING AND STOPPING MECHANlSM.

APPLICATION FILED JULY 28. 19W.

Patent-ed Dec. 5,1922.

5 SHEETSSHEET 5 Qua Patented Dee. h, 1922.

AUGUST Ev SCHOETIKY, 0F- SDMEB'VILLE, MASSACHUSETTS, ASSI GNOR T0 REECE SHOE BEAGHINERY'CQMPANY, OF BOSTOI Q', MASSACHUSETTS, A GOBPORATION OF MAINE- J DRIVING AND STQPPING MECNISM.

a ncauoa'med Jul as,

To all whom it may concern:

Be it known that 1, AUGUST R. SOHOENKY, a citizen of the United States residing at Somerville in the county of Middlesex and State of Massachusetts, have invented a new and useful Driving and Stopping Mechanism, of which the following is a specification, reference beinghad therein to the accompanying drawing.

This invention is a novel driving and stop ping mechanism, useful, for example, on

a power driven sewing machines, it being here in for the purposes of illustration shown applied to a shoe sewing machine known as the welt-and-turn stitcher, which operates to attach the insole, and sometimes the welt strip, to the u er.

One 0 ect of the invention is to afiord, by pedal or other control, a designated maximum or high speed of drive, and a designated slow drive, the latter useful at the more diiiicult parts of the shoe. A further object ,is to permit a. ready and easy shift of speed between the designated high speed and the designated low speed. A further objectis to give a satisfactory stopping of the machine by the throwing ofl of all power and the applying of a stopping means to give the correct final position of the parts, for example, with the needle withdrawn from the work so as not to prevent the retraction of the work from the machine. A hooked,

curved needle being employed in this par- .iticular class of machine, I contemplate also the final disengagement of the thread from the hook, so as to wholly free the work for removal, but, as mechanisms for this additional purpose are shown in prior applications of mine, I make no disclosure or claim thereof herein. An additional object of the present improvement is to effect an automatic openlng or release of the thread tension or clamping device at the time of the stoppage of the machine. Further and more particular objects and advantages of the present invention will appear in the hereinafter following disclosure of one embodiment thereof, or will be apparent to those skilled in the art.

To the attainment of the above referred to objects and advantages, the present invention consists in the novel driving mechanism and the novel stopping mechanism herein disclosed or claimed, and the novel features rare. serial no. mares.

of combination, arrangement, mechanism,

structure and detail herein described.

In the accompanying drawings, Fig. 1 is a left elevatlon of a shoe stitching machine embodying the driving and stopping mechanism of the present invention.

Fig. 2 is a front elevation thereof, with Fig. 5 is a section taken' on the line 55 of F 1g. 3, looking from the rear.

Fig. 6 is a section taken on the line 6-6 of Fig. 4, looking from the left.

Fig. 7 f is a central section of the disengaging clutch and stop means'at the top of the machine.

Fig. 8 is a section taken on the line 8- 8 of Fig. 7, looking from the right.

Fig. 9 is a plan view showlng certain of the thread tension releasin connections.

Above a base 11 exten supwardly the machine post 12, at the top of which is the frame part ofhead 13, which supports the stitching instruments and their operating connections.

' The prime source ofpower is the belt pulley 14, alongside of which is a loose pulle 15, both arranged on the forwardly exten ing power shaft 16. Through the driving connections to be described, power is transmitted at hi h or low speed to the transverse shaft 1%, which has a pulley 18, connected by drive belt 19 with a pulley 20, on the main or operating shaft 21 in the head of the machine. The usual hand wheel 22 is shown at the left end of the main shaft. The stitching mechanism 23, driven from the shaft 21, includes the curved, hooked needle 24, and co-operating instruments, which need not here be described, and the shoe rest or bumper 25.

. At the front a pedal 27 is shown, which, as will be explained, controls the driving and stopping mechanisms. Tn Fig. 1 a pedal rod 28 is seen above the pedal, and thereabove a connected pedal rod 29, extending to the unclutching and stopping mechanism at the other means.

top. At the rear of the head is seen the'tension device 30.

The high speed connections, the low speed connections and the means for securing intermediate speeds, all of which are interposed between thepower shaft 16 ,and the transverse shaft 17, are best shown in F gs. 3 and 4, reference also to be had to Figs. 2, 5 and 6.

The low speed connections include a worm 33 on the power shaft, and dlrectly beneath this a worm wheel 34, the same mounted on the worm shaft 35, which near its left'end has a gear 36, engaging the gear 37 on the shaft 17. The arrangement is such, as seen 1n Fig. 6. that the gear 37 may drive the transverse shaft at the low speed, and maintain 1t at that speed as a minimum, without, however, preventing the shaft from being driven at a higher speed. In other words, a one-way engagement is provided. Rather than the nois and ineffective toothed ratchet and paw I employ the plan shown in Fig. 6, in which a hardened steel ring 38 is secured within the gear 37, while the hub 39 fast on the shaft 17 is furnished with three or more rollers 40, engaged in tapered recesses 41 in the hub 39. Each roller is adapted to be wedged between the narrow end of its recess and the hardened ring 38. By this arrangement the gear. which is constantly turning in the direction of the arrow, will constantly drive the hub and shaft in the same direction unless the latter happen to be rotating or driven at a higher speed by some Such other means in the present machine is the high speed drive, which will next be described.

Referring back to Figs. 3 and 4, a friction disk 44 is. shown as splined on the power shaft, so as to rotate with it, but capable of axial sliding. Facing this disk is a second friction disk 45, which is loose on the power shaft. but capable of being driven by pressure against its face by the other disk 44. Between the friction disks may be an intermediate friction disk bearing against both of them, as is frequently employed in this contrivance. By forcing the disks into mutual contact the disk 45 is driven, and this through a bevel gear 46, carried by the disk 45, drives a beve gear 47, mounted directly on the cross shaft 17. Obviously, whenever the disks are pressed together forcibly so as to engage frictionally without slippage, the full speed drive is communicated from the power shaft to the cross shaft, and through the upwardly extending belt the main shaft will be driven at maximum speed.

When the friction disks areidisengaged, the drag of the machine would tend to reduce the speed of the transverse shaft 17, which, however, cannot pass below that of the low speed drive connections 33-41. It is sometimes desirable to expedite the retarding igeaeeo or speed reduction from the high to the ,low, especially for the purpose of abruptly stopping the machine when running at the maximum speed. For this purpose a brakin -may remain inaction during the low speed drive without detriment. During high speed drive, however, it is advantageous to remove the braking pressure, and for this purpose a pair of toggle links 54 are shown, arranged to cause the spreading of the extensions 52 and the opening up of the brake. band. This is done when the treadle 27 is depressed, a link 55 extending downwardly from the toggle linksto an offset 56 on the pedal. The connections for controlling the high and low speed drives, and incidentally for securing gradual variation of frictional pressure between the disks 44 and 45 to ease more or less the changes of speed above the the invariable minimum or slow speed are preferably controlled from the pedal 27. For this purpose a block 59 having a wedge surface 60, and mounted to move axially on the power shaft in proximity to the friction disk 44, is in constant engagement with an up and down moving block 61, having a wedge surface 62 bearing against the wedge surface 60. A spring 63 constantly pulls forwardly the axially moving block 59 to remove the pressure and friction between the disks. A link 64 extends from the second wedge block 61 to the depression of the pedal forces the block 59 pedal; Thereby the and the disk 44 to the left to impose the desired friction. A spring 65 normally lifts the pedal to the position shown in the drawings. When the pedal is depressed fully, that is, to the lowest dotted line position shown in Fig. 2, the full pressure between the disks causes maximum speed drive. When the pedal is let up to the middle position' shown, the frictional pressure is substantially removed, and the machine is driven at the low speed. By manipulating the pedal between said two positions, variations in friction and slippage may sometimes be introduced to give, to a certain extent, a control over the stitching speed, although usually the speed will be either the maximum or the predetermined minimum.

en, however, the pedal is let up completely from the middle to the topmost position shown, this, as will be explained, throws out the clutch at the head of the machine and applies the stop motion. It is unclutching and stoppin at the top of the machine. this end t e lower pedal rod 28 is provided at its upper end witha sliding block 68, coned beneath a %ide plate 69 at the front of the machine.

his block has a in 70, riding in a slot in the plate I for guidance. The block also has ,a leftward ofiset or lug 71. This is for co-operation with a block 72, mounted at the'lower' end of the pedal rod 29. A pin 73 on thebloclr 72 engages a guide slot in the plate 691. Also the block 72 hasan ofi'set; or lug 7d, normally above the lug 71 on the other block, and a shoulderor projection 75 be neath the same. These parts may be desied substantially as shown in Fig. 2, and the guide slot to the block 72 may have an inclined or cam portion 76 for throwing the block 72 to the left, out of operative engagement with the other block. By this arrangement, when the edal is depressed from the top to the mi dle position, the pedal rod 29 descends with the rod 28, owing to the engagement of lug 71 with the shoulder 75. The pin 73, however, riding leftward into the cam slot 76, shifts the block 72 to the left, so that the shoulder 75 disengages the lug 71, and the further downward movement of the pedal leaves the ulpper pedal rod 29 stationary. The lug 71 des against the righthand edge of the block 72, and thereby holds it in its disenaged position. on the dal is again let completely up, the lug l strikes the lug 74,-lifting it and causing the block 72 to rise and resume its illustrated position.

By these descri arrangements the pedal 27 gives complete control. In its lower range of movement, from middle to bottom, it is varying the speed between low speed and'high speed, or applying the high speed. In its upper range, from middle to top position, it is lifting or dropping the upper rod 29, which controls the unclutching and stopping of the main shaft of the machine. This description brings us to the parts at the head of the machine.

The main shatt21 is the operating shaft, which drives the stitching mechanism. This during stitching operatmns is driven through the belt 19 and pulley 20, as before described, either at the maximum speed or at the low speed, or at some intermediate speed. Preferably, the drive is wholly thrown ofl' or unclutched, not at the base of the machine, but at the top, namely, between the pulley 20 and the shaft 21. For this purpose a frictional clutch 80, 81, is employed. Keyedon the shaft 21 is the disk 80, havin an inclined inner clutch surface oppose to the similar exterior clutch surface of the friction ring 81, mounted directly on the pulley 20, as best seen in Figs. 2 and 7 The engagement and disengagement betweenthe clutch members member 20 bearing axially movable, as

disengaged will serve to extension 86. For swinging this downward a relative axial sliding y loose nplon the shaft.-

of a clutch lever 84, havin a fixed fulcrum 85 and a. downward extension ahbent lever" 87 is shown, iul- Y 'crumed at its lower endat 88, and pivoted at 891:0 the lever 86. The lever 87 has a rightward extension 90, by which it is swung to cause the swinging of the clutch lever. The extreme right end of the ex tension 90 is pulled upwardly by spring 91, which thus tends to close the clutch. The clutch, it will understood, is to be closed whenever the control pedal 27 is in its lower range of mpvement. When the pedal is let up to its top pgsition, this throws open the clutch at the top of the machine. The following mechanism may be employed. A plunger 0r piston 93 is shown operating vertically within a hollow barrel" 94. lower or spindle portion 95 of the plunger is surrounded by a spring 96, tending to lift it. Exteriorly at the bottom of the spindle is a head 97, which limits the upward movements. The rear side of the head 97 has connected to it a link 98, extending upwardly exteriorly of the barrel to where it is connected to the arm 90 of the bent lever, which swings the clutch lever. The relation of these parts can be observed in Fig. 1. At the top of the link 98 are adjusting nuts 99 for controlling the initial position of the parts, and thereby the relation of the clutch parts 80, 81.

The plunger and connected parts are shown in their downward position, which corresponds with the open condition of the clutch. When the plunger rises, it restores the clutch to closed condition. The spring 96 causes the rising. The means for depressing the parts will now be described.

On top of the lunger is movably mounted a finger 100. his, as seen in Fig. 7, is swingable from the full line position shown to the dotted line position, at which latter it is inoperative. When it stands upright, as shown in full lines, it is operative. This swinging member or finger serves as a follower for a stop motion cam 101. This cam constitutes the peripheral surface of the disk 80, forming one member of the clutch. The shape of the cam 101 is indicated in Fig. 8. It has a portion 102, which is shown in Figs. 7 and 8, and which serves The 1 position of the parts. .When the machine is running, the follower stands to one side, as shown in dotted lines in Fig. 7. When the machine is running, it is normally ino erative. When the pedal is let up comp etely and the time comes to stop the machine, the follower is caused to bear to the left, as will be explained. It attempts to reach operative position against the periphery of the cam. As the figures indicate, however, this cannot be done, as the periphery is of such extended wldth as to serve as a guard, except at the cam portion 103. This recessed peripheral portion permits the follower to assume operative position, always at approximately the same point in the shafts rotation. Further around the cam is the inclined surface 104, which, as will be explained, serves to give the final downward thrust to the plunger 93, and thereby apply ,a braking force upon the main shaft. The follower passes out of the recess 103 by an inclined surface 105 to the guard portion 106.

The described operation of the cam follower is controlled from the pedal through the pedal rod 29, which, as described, rises when the pedal is let up completely for stopping the machine. As shown in Fig. 2 and indicated in Fig. 7, the pedal rod is connected to a pair of toggle links 107, 108. It straightens the toggle links, and thereby thrusts leftward a slotted arm 109, to which the link 108 is connected. The slot in arm 109 engages a pin 110 on the finger or follower 100. Thereby the lifting movement of the pedal rod tends to thrust the follower from its inoperative dotted line position of Fig. to its operative full line position of Figs. 2, 7 and 8.

The result is that, when the pedal is let up, the follower attempts to reach operative position, but can only do so at a certain point in the cycle, that is, when opposite the cam recess 103. The cam immediately thrusts downwardly the follower and plunger, thereby swinging the bent lever 87 and opening the clutch 80, 81. The machine will then always come to a stop at approximately the same point in the cycle, for example, with the needle retracted from the work.

To ensure the accurate stoppage of the shaft, a final braking mechanism may be employed as follows. This utilizes the final downward thrust of the plunger 93, caused by the cam incline 104, which brings the plunger beneath the final cam surface 102, as shown in the figures. The plunger has an extension 112, on which is mounted a T-shaped member 113, vertically adjustable by nuts 114. This member operates a pair of toggle links 115, best shown in Fig. 8.,

which serve to apply and release a brake band 116, surrounding the drum or braking surface 117 of the clutch disk 80, which is fast on the shaft 21. As seen in Fig. 8, the final downward thrust of the plunger has pulled on the toggle levers, and thereby forcibly applied the brake band to bring the drum and shaft to a stop. The brake is lightly applied by the cam portion 101 before the disengagement of the lugs next described.

Supplementary to the frictional action of the clutch 80, 81, I have provided a positive engagement in the form of a pair of engaging teeth or lugs 118, 118, mounted respectively at the right end of the hub of pulley 20 and the left end of the hub of clutch member 80, as seen in Figs. 7 and 8. Thus, while preventing any slipduring the normal action of the machine, and ensuringcorrect drive, notwithstanding the resistance of the work and stitching mechanism, the lugs 118 are readily and quickly disenga-geable when the clutch is opened, as in Fig. 7. This supplemental expedient assists in ensuring that the final stoppage of the main shaft will be at the correct point in the cycle.

It remains only to describe the throwing open of the thread tension on the final stoppage of the machine. The toggle arm 107, one of those which serves. to thrust the stoppingfinger or follower towards its I tension 119, see Figs. 7 and 2. Therefrom' an adjustable connecting rod 120 extends to the right, to where it is connected to a swinging lever 121. This lever, as shown in Fig. 9, is fulcrumed at the rear of the machine, and has a rearwardly extending tail 122, engaging in a notched sleeve 123, mounted between the thread wheel 124 and the tension spring 125. Normally the spring applies friction to retard the rotation of the thread wheel, and thereby restrain the drawing of thread. When the machine is stopped, the swing of lever 121 compresses the tension spring, and thereby wholly releases the thread to permit its being freely drawn from the supplywith the removal of the work from the machine. This occurs at the correct point in the final stitch cycle, as the follower drops into the cam recess 103.

The stopping actions may be somewhat as follows. When the follower 100 drops in beneath its cam 101, this releases the tension, nearly one revolution before the final stop. As the follower rides out of the cam recess 103 by the cam incline 105, this applies lightly the final brake, which is rather an increased drag than a stopping brake. The clutch lugs 118 are still engaged and drivin positively. This continues around the guard memao surface 106. Next the final throw-down of the follower by the cam surface 104 puts the brake or drag into effect with full force and instantly the clutch lugs disengage, preferably the clutch opening connections being loose and delayed in action for this purpose, The machine, being of light momentum, and with its drag so greatly increased, now stops almost instantaneously on the cessation of drive, and without need of an impacting stop.

It will thus be seen that I have described driving and stopping mechanism, embodying the principles and attaining the advantages of the present invention. Since many matters of combination, arrangement, design, construction and detail may be variously modified without departing from the novel principles involved, no limitation to such matters is intended, except so far as set forth in the appended claims.

What is claimed is:

1. In a driving mechanism, a power shaft, an operating shaft, high and low speed connections, a pedal, connections from the pedal for controlling the high and low speed connections, a stopping clutch for the operating shaft, a pedal rod for controlling said clutch, and mechanism whereby the pedal actuates said rod only when the high speed is disengaged.

2. In a stopping mechanism a clutch, a clutch throw-out, a friction brake or drag,

I and cam control for applying the brake to increase the drag and then operating the clutch throw-out to give stoppage in a predetermined position.

3. In a driving mechanism, a power shaft, an intermediate shaft, and an operating shaft, in combination with high speed connections from the power shaft to the intermediate shaft, including a clutch, low speed connections from the power shaft to the intermediate shaft such as to maintain a minimum speed of rotation of the intermediate shaft but to permit its being driven faster by said high speed connections, means for applying or releasing the high speed clutch to cause high speed or low speed drive, connections from the intermediate shaft to the operating shaft, including a clutch, and means for applying or releasing the last named clutch.

4. Driving mechanism as in claim 3 and wherein both said clutches are controlled by matically upon the release of the high speed drive to impose a drag to retard the intermediate shaft to the low speed, and wherein a single control member or pedal is employed, so arranged that when thrown it first causes the release of the high speed clutch and the application of the brake and thereafter the release of the other clutch. 7. In a driving mechanism operating be tween a power shaft and an operating shaft. the combination with said shafts, of atrain of connections including a clutch by which high speed may be transmitted to the operating shaft. low speed connections such as to maintain a minimum speed when said clutch is released but permit a faster speed through said clutch, a drag means adapted to slow the operating shaft when said clutch is released, and another clutch adapted to wholly disengage power when released.

In testimony whereof, I have aflixed my signature hereto.

AUGUST R. SCHOENKY.

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