US1220786A - Driving and stopping mechanism. - Google Patents

Description

' To all whom it'may concern:

UNITED-STATES PATENT OFFICE;

JOHN manor,- or nmcnns'rnn; MASSACHUSETTS;

p'mvmc AND s'rorrmci mncnamsm.

- Be it known that'LJOHN Rnnon, a citizen of the United States, residing at Manchester, in the county of Essex and State of Massa 'chusetts, have invented certain new and useful Improvements in Driving and Stopping -.Mechanism.s, of which the following is a specification, reference being had therein to This invention relates to ping mechanisms, and more partlcu-larlyto a mechanism adapted to be incorporated in power driven ,machines, in which high'or V destructive momentum-is present by reason of the greatweight or speed'of the rotating parts. I The main objectof the present invention.

is to effectively provide for the stoppage of the rotating shafts ofsuch a machine so as to give a predetermined finalangular position of the shaft, and. yet without undue or destructive shock, and to effect this accurate=and easy stoppage in a predetermined manner andquiclgly in pointof time.

It is a further object hereof to bring about such an advantageous stoppage of the n1achinein an automatic manner,'that is to say,

without any special attention or skill-on the partof the operator, Further and detailed objects and advantages. of the present in.-

'vention will be elucidated in the hereinafter following description, or will be apparent I 'to those skilled in the art;

" Tothe attainment of the above referred to objects and advantages, the present nvem, {tion consists in the novel mechanisms, de:

vices, arrangements' details and'other features herein shown or described. 1

I will first describe one form of driving and stopping mechanism embodying the present invention, and will then point out.

- In the accompanying drawings,

the novel features in the claims.

is a left elevation partly in generally central section'of a portion of a ma'chme containing bodying the present invention;

.-Fig. 2 isa i ---,nism shownin -Fig.. 1, with the .machme front elevation of the mechaframe or case shown in section to better disclose the-interior.

- i Fig. 3" is, a partly sectional view of certain U details.

' Fig. 6 is a diagram of Figure 1 constituting the, impact stopping device;

13g. 5 is similar to Fig. 4 showing adifferent stage of. operatic r the control lever or pedal action. i All the figures, excepting Fig. 5, show the Specification of Letters Patent. Patented Mari-2 7, 19:17, Application filed September 5, 1916. Serial No. 118,486; I

parts in their position after the machine'has been stopped.

The .present invention for stopping a maventing the application of the stopping device until the decreasing speedofthe driven.

chine operates'upon the principle of-preshaft has reached a certain low speed sufliclent to carrv the parts through by momen tum to thefinal position, but insufiicient to produce any substantial shock. Also in its fullest embodiment the invention involves. a frictional or analogous retarding means by which the destructive energy and momenturn may quickly eliminated'by re-- tarding the shaft speed, the retarding action ceasing when the decreasing" speed has reached a predetermined low speed, so that the shaft is left running free under sufficient momentum to carry the parts through withv out the danger of prematureistoppage by the retardin means. The described operations are preferably automatically" controlled by the machine itself through the shaft which is to be stopped,

and for this. purpose among other devices is embodied herein a governor or speed-l operated instrument,: which turns in syn-i chronism with the shaft and which assumes different positions or. conditions according to the speed. 'By causing thisgovernor. to

, operate so as to disengage the friction brake or retarding device at a' designated 10w speed and" tothen permit the stopping device to assume operative condition, the objects of the 'present invention are secured.

Referring first to some of the general parts, the machine is shown as having a hol- ,lowbase casting 8, which incases parts of the mechanism'.- Upstanding from the base is a post 9, which may extend to .a suitable height'for the support of the stitching mechanism or other. mechanism which is to bev drivenand stopped. The base also has an upstanding bracket 10, which supports a bearing for. a shaft 11, the post 9'supporting' a hearing at the other end of the shaft.

BEST AVAILABLE The shaft 11 may be considered one of the (haven, shaits otthe machine, since itis permanently geared to the operating or provided a bevel gear 12. which meshes with a bevel gear 13 carried by a cross shaft 14:, suitablyjournaled in the post 9. The cross to shaft extends through the casing or {wall of the post, and at its exterior end is provided with a helical gear 15, which is in mesh with a helical gear 16 carried on a shaft 17 that extends upwardly, and-is suit- 16 ablywgeared to the operating or stitching lllzlft of the machine. In order to provide for the application of power to the shaft 11 it is shown as provided with a belt pulley or powerpulley '18 turning loosely on the shaft. At this point may be mentioned also the brake or retarding device consisting of a non-rotatable cone 'member 19 having adjusting screws "20 for adjusting its effectiveness of action.

out; the brake device comes into action, and before being disengaged is supposed to retard the shaft speed from the full working speed to a fraction thereof, for example,

80 one-fifth full speed, resulting in-a reduction'of the destructive energy or momentum in the proportion of to 1, so that, when the stopping device finally acts, the energy" and impact are negligible.

In order that the shaft 11 may be either to the power pulley' 18 or to the brake cone 19. a clutch device 25 is provided. This may comprise a clutch part or disk 26 adapted to engage frictionally'with 4 a corresponding portion of the driving pulley 18; also a clutch part orcone 2? adapted to engage in the brake cone 19. The clutch has a sleeve portion 28 splined to the shaft 11 enabling it to be shifted axially to cause one or the other of the clutches to be engaged.

For shifting the clutch 25 a ring 29 1S arranged loosely in a suitable groove in' the clutch sleeve28. and the ring is engaged by the upper end of a yoked lever 30, which lever is centrally fulcrumed and is adapted to be swung between three positions. the central position being neutral and serving to disengage both the power clutch and -'the brake, while the extreme positions. cause the engagement of one or the other. It will thus be seen that by moving the lever 30 at. suitable times the power may be thrown ofi" and the brake applied, and sub- 69 sequently, the brake disengaged. The movements of the'lever efiectedipartly -at-the will of. the operator thro'iigh a-starting :leveror the like: Thus,

a shziirt link 31 is shown. as extending between {ever 30 and swinging arm 32, ths

\Yhen the power drive is thrown coupled link and arm forming a toggle by which the leyer may be swung A link 33 extends frimrthe toggle joint to acontrol lever or pedal 3i, which is provided with a foot piece at. its. front end, having different 7( operative positions, as seen in Fig. 6.

, The bottom pedal position 8% corresponds with the full driving condition of the machine, and the pedal is held down in that position during the normal running; In the lifting of thepedal from its bottom to its top position, the first action is the disengagement of the power clutch, which may occur at or about the pedal'position 34*. The next pedal position 34 is the middle 30 or neutral position in which neither the power clutch northe brake' are engaged. At 3? the brake commences to engage, and

at 34 it is in full engagement.

The pedal lever is fulcrumed at'36 and 5 is provided with a' lifting spring 37, which is strong enough to put the brake into full effect. v i

The operator by depressing the pedal at will to its lowest position puts the power 9 drive into effect upon starting the machine. Vhen he desires to stop, he releases the pedal, thus disengaging the power, and the pedal moving to its topmost position causes the engagement of the brake. The remainder of the stopping action is automatically controlled orefi'ected by the machine without the attentionor skill of the operator; although the operator may lift the pedal to, its halfway position and there latch it by hook 38, upon which the shaft is left freeto run down and stop by natural causes; I p

The preferred automatic operation of the meehanism after the pedal has been let fully up is that, throughthe govern'orreferred to,the pedal is thrown down to its neutral position so as to disengage the brake, leaving the shaft running at the designated slow speed. Up to this time the mechanism has prevented the stop device from acting, but at this time permits it to act, so that the shaft, now running under harmless momen tum, is brought to a full stop without shock and in the desired final. angular position. The stop device may consist of a rotating disle39, turning-withthe cross shaft 14 and having-a stop projection combined with a non-rotatable stophor dog 56. Theseparts are shown prior to their stopped position in .120 Fig.5, and in their stopped position in Figs. 4.--and*.2.' .4

}The further details and the control of-the stop device will now be explained.

The disk 39, Whichacts both as arotating sto proje -ion and. as a guard, shown slidiible axially pon a. squared portion of the cross shaftl i. This enables the disk to r lee-shifted to. the left, where it will be inoperativ or to return to theright, as seen in 4 39, it is shown as constructed with a. deep re Fig. 2,, where it becomes effective, being dircctly above the dog 56.

For shift ng the disk 39 it may be pro- YlClQd with a grooved collar 40, engaged by studs at the. end of an upright yoke arm 41, which forms part of a plural-armed lever, another arm 42 of which extends to the left. This lever is fulcrumed on a fixed bracket 43 secured to the frame of the machine.

Beneath the extremity of arm 42 and pi votedthereto is a slide or plunger 44, fitted at its lower end to move -'up and down within a portion of the fixed bracket 43. A spring- 45, hearing on the bracket and plunger, tends to lift thelatter and thereby force the stop disk 39 toward its effective position.

\Vhen the, plunger-is moved down in starting the machine and the stop disk moved to theleft, the parts are adapted to be temporarily locked in this position by means of locking shoulders 47 on the plunger and 48 on a bolt 49', as seen in Fig. 3. A spring 50 presses the bolt to normally cause the shoulders to engage: As will be'afterward explained, this locking device is adapted to be unlocked at the proper instant'by means of the vernor, sons to permit the stop device -to,becom'e effective;

The stop pin or dog 56 is directly below the effective position of the disk 39 and is .slidably mounted in thebracket 43, having a spring 57 tending .to lift it. -The stop pin has an adjustable stop, .58 limiting its upward movement. Y

Referring to the contour of the stop disk cess or depression 61, which is followed by a guard or concentric portion 62, this in turn being followed by a, rising portion 63, and

lastly a final stop shoulder 64.

It will be'understood that in the normal running of the. machine the stop pin 56.-

stands to the right of the disk in Fig. 2 so that the stop device is ineffective, and the pin will'then also stand in its highest osition, as indicated in Fig. 5. This condition continues as long as the operator holds'tne pedal at its lowest position. 'A/loose link will be noticed on Figs. 1 and 2, whereby, when the pedal is fully depressed, it draws down the. arm 42 and the plunger 44 until the latter is locked b the engagement of the shoulders 47, 48. en the operator releases the pedal," i't springs to its highest position, thus throwing out the power drive and engaging the retarding clutch 19., 27 The shaft is thereupon promptly slowed down until-a governor 7 0 comes into'play to control the furtheraction of the stop. mechamsm.

The governor for convenience is illus: trated of the centrifugal ball type, be1ng. mounted 'o'na vertical shaft 71 helical gears 7 2 and 7 3 with the driven-sh 1 1 :0 that the I governor operates inj yir tive position. 7

and down on the'vertical shaft, having a predetermined vertical position corresponding with each degree of speed of the ma.- chine. \Vhen the machine is running at full speed, the sleeve '74 is elevated, but as'the machine is slowed down by the braking device 19, 2?, the sleeve gradually descends.

Connections are employed such that, when the sleeve descends to a position correspond- I ing with the predetermined slow speed of the shaft, the stopping device 39, 56 is permitted to operate. gro'ov e d and is engaged by studs ona yoke arm m. bracket and has a downward arm? 6, which is connected by link or pusher 77 tojthe vertical lever T8, the lower end of which extends into engagement w th a recess or socket in governor operates when the shaft speed is reduced to the desiredquantity to throw the locking. bolt 49 to the left, thus releasing the plunger 44, which is lifted by its spring 45 so as to throw the stop disk 39 .into efi'ec'-' In this way the object isattained ofpre' Thus, the collar 74 is This arm. is pivotedto a fixed the locking bolt 49. The operative relation I between the link 77 and the lever 7 8 may be adjusted by lock nuts 79. In this way the venting the stopping device from acting.

until the shafts speed is down to a desig nated point, and isthenpermitted to operateto stop the shaft in the desired angular position without substantial shock. The final impact does not occur immediately upon the unlocking of 'the'plunger 44, since the stop disk 39 must waituntil it reaches the Fig. 5 position before it can shift axially into effective position. Thereafter the disk turns while the stop pin 56 rides around theportions 62 and 63 of the disk until the final impact of the shoulder 64 against the stop pinillustrated in Fig.4. 1

When the braking device 19, 27. is em-' ployed, this, if left in engagement, might, owingv to the great uncertainty of brake action, prematurely stop the shaft before the parts have reached the desired final p0-' sition indicated. Therefore it is a partof this invention that the governor 70 shalldisengage the brake when the shaft speed has been reduced to a designated point at which the speed is hi li enough to carry the parts through to the nal impact, but insufiiciently' high to produce objectionablefshock.

This throwing-out of the braking, device by the governor is shown as efl'ecte'd herein 1 by connections including-alarm 81 rigidl withflthe rms 41 and-'42,,thejann 81 cmnected by a link or push rod 82 and an adjustahlehead 83to the control lever or pedal,

3- Vhen the plunger is released and the parts jumped to the position shown in Fig.

2, the rod 82 thrusts the control lever. 34L

downwardly from its topmost to its neutral position, marked'3-t" in Fig. 6. This in turn adjusts the double clutch 25 to its neutral position, and the retarding. force is thereby removed, leaving the shaft to rotate under low momentum until the final stoppage by the stopping device 39, 56.

It will thus be seen that I have described a drivingand stopping mechanism embodying the principles of this invention, and at taining its objects and advantages. Since many matters of arrangement, design, detail and other features may be modified without departing from the novel principles involved, it is not intended to restrict the invention to such features, except so far as set forth in the appended claims.

YVhat is claimed is:

1. The comhination with the rotating parts of a machine, of a retarding device for slowing'the rotary speed thereof, a speed operated governor, and connections from said governor for rendering the retarding device inoperative at a predetermined speed.

A stop mechanism comprising in combination with the rotating parts to he stopped, a stopplng device, a retardlng deslowing the speed of the rotary' parts, means for holding inoperative the stopping device,

a governor, and connections whereby the governor at a predetermined speed renders the retarding device inoperative and releases said holdingineans, whereby the parts may he stopped from slow speed h v said stopping device. p

it. A stop mechanism comprising in eomhination with the rotating parts to hestopped, a stopping device, a retarding device for slowing the speed of the rotary parts,- a driving means, a lever shiftable from a first to a second position for disengaging the driving means and applying the retarding device.- and a govermir operative at a predetermined speed for throwing said lerer to a third position for disengaging the retarding means prior to the action of said stopping device.

In testimony whereofil have aflixed my signature hereto.

JOHN BEECH.

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