US1969838A - Starting and stopping mechanism - Google Patents

Description

1934- F. c. EASTMAN 1,969,838

STARTING AND STOPPING MECHANISM Filed Feb. 20, 1930 Patented Aug. 14, 1934,

, STARTING AND STOPPING MECHANISM Fred C. Eastman, Beverly, Mass, assignor to United SheeMachinei-y Corporation, Paterson N. J., a, corporation of New Jersey 7 Application February 20, 1930, Serial No. 430,049

' .20 Claims. (01.192-148) This invention relates to starting and stopping mechanisms and is illustrated herein as embodied in a mechanism developed for use in afastening inserting machine of the type shown in 'copend-- 5 ing application'Serial No. 139,071, filed Feb. 20, .1930, in the name of Fred N. LaChapelle and Fred C. Eastman, and since issued as Letters Patent No. 1,918,274, dated July 18, 19 33.

It is an objectiof the invention toprovide an improved clutch of the rotating key type which is suitable for use in machines of this general type and which can be, used also in machines of other types.

.With the above object in view, a feature of the invention consists of mechanism adapted to rotate the key, in a clutch of the rotating key type, into clutch engaging position, which mechanism, after movement of a controlling member, is driven by power from a moving member. This member is driven while the clutch is disengaged and it may be driven continuously. For example and as herein illustrated, it isdriven by movement of a continuously rotating part of the clutch, i. e., by the driving member of the clutch. The 'key is rotated to engage teeth on the driving member and, because this member itself also causes the rotation of the key,the key is rotated in timed relation to the movement of the teeth.

Another feature of the invention consists, in -aclutch having power driven or operated means for rotating the key into clutch engaging position', of power driven or operated means for throwing the key into disengaged position, the power for thispurpose being supplied preferably by the bodily movement of the key as itis carried, with its associated parts, around with the driving shaft. I

A further feature of the invention consists, in combination with a clutch of the above type, of means for adjusting the position of the part that operates to throw the clutch out of engagement so tha'tit will operate .at the proper time in the cycle of the machine driven thereby, to allow it to drift to a stop atthe comple'tion of a single revolution.

Another feature consists, in a clutch having a power operated member for rotating "a' clutch key into clutch engaging position and means for disengaging it, of a controlling member for .rendering the power operated means effective, saidcontrolling member being constructed and arranged to prevent re-engagement of the clutch until after the controlling member has .been

The head mayrbe counterbalanced by aspring 14 which tends normally to lift the head away from "the work or it may be counterbalanced by asuitmoved to neutral position and repositioned. in starting position. I Another feature of the invention consists in a novel arrangement of parts for rotating the key comprising a longitudinally yielding plung- 6Q er located in a bore in the key, a radial arm on the plunger by which the .key maybe rotated and means, preferably power operated, by which the arm .maybe turned to bring the key into clutch engaging position. A further feature consists, in the-combination with an arm for rotating ,the,.key into clutch engagingposition, of another-arm, connected to the key, by which the keymay be rotated to disengaged position when the second arm is acted upon, duringrotation .of the clutch, .by a fixed member. s j

The features of the invention outlined above, as well as the'further features hereinafterdescribed and claimed,'will be understood when theyv are considered in connection with the ac- .compa'nying drawing, in which, I

Fig.1 is a side elevation, partly in section,

showing the head of 1a,,fastening inserting machine of the typeshown in the copending application referred to and illustrates featuresof the clutch mechanism of the present invention;

of the arrows; and

Fig. 4 is a section taken on the line IVIV of Fig. 2 and looking in the direction of the arrows.

The mechanism of the fastening inserting ma- .chine is mounted upona swingingframe or head 10, which ispivotally mounted on the shaft 12.

able distribution of weight'therein. A hand lever 16 is fixedly mounted ona shaft 18 pivoted in the head of the machine. A torsion spring 19, .100

.on' the shaft 18, tends to lift the-hand lever 16.

The handlever 16 is used to swing the head into operative relation with the work 20 which, as

illustrated, comprises .a shoe,.the forward portion of which issupported by a toe rest 22, mounted in 1 05 .a suitable holder 24, supported by the base of l ative position.

without, in the meantime, operating the clutch controlling mechanism which is also controlled by the same hand lever 16. I

The shaft 18 also carries another lever 26 fixedly mounted thereon, and this lever 26 is connected by means of aconnecting rod 28 to another lever 30. The lever 30 performs three functions, i. e., it serves to lock the head in Work operating position, it is a portion of a safety mechanism by which operation of the clutch is prevented until the head is in operative position, and it carriesa controlling member 32, pivotallymounted thereon, by which the clutch is started to operate the fastening inserting mechanism/4111c other portion of the safety mechanismreferredtoconsists of a fixed cam 34 having a face 36 concentric with the shaft 12 and a ,radial face 38. As the head 10' of the machine is brought forward by the forward and downward pressure of the handle 16, the endof the lever 30 rides upo the concentric cam face 36 which maintains the controlling member 32 out ofengagement with the clutch. The cam face136 also acts as an abutment. to prevent the handle fro'm movingrelative to the head 10, so that the handle is effective to bring the head intooperative position. When the head reaches {operative position, the end of the lever 30 drops off the concentricfface 36 of the cam and reaches a position'of clearance just in front of the radial face38.

The clutch is then: engaged and the machine istart'ed'in a mannerhereinafter to be described ,(in. the direction indicated by the arrows in the various figures) 'andthelev'er 30 is then given'a slight downward motion to takeup the clearance between its lower end and the radial face 38 and to furnish pressure to clamp the head 10 in 0per- This movement and clamping pressure isobtained because the lever 30is pivotally mountedupon a stud 39,,on a cam lever 40 "which lever is pivoted at41 on the head 10 of the machine, The cam lever'40carriesa 'cam roll :42 which engages a cam 44 driven by the machine and shown in dotted linesin Fig. 1. A rise'in the cam 44 lifts'the cam roll 42 on the lever 40 and causes a depression and downward pressure of the upper endof the leverAO upon which the .Ilever 30 is mounted. The;upper arm of the lever 40 and the lower, arm .of' the lever .30. may be considered as a toggle having its upper endpivot at I 41-, its middle pivot at 39 andits lower end pivot or abutment onthe'radial face 38-of the fixed cam 34. As the pivot 39 moves down, it tends to forcev the pivot 41 away from thefixed'abutment or face 38, causing a tendency for the pivot 41 to move in a clockwise direction, in Fig. 1,-about the shaftul2. As the pivot 41 is mounted in the head 10, the head also has a like tendency to move which causes its outer end, carrying the fastening inserting mechanism, to move about'the shaft 12 I to clamp the work. The lever 40 has hereinbefo're beenconsidered as a single lever but it is actually made of two parts, which may be adjusted relatively'to each other by means of an adjusting screw 46 so that'the clamping pressure may-be adjusted by suitably adjusting this screw,

7 As the end of the lever 30 drops offthe concentric portion 36'of the camias previously described) the downward movement of the conjtrollingmember 32, mounted thereon, operates to engage the, clutch and start the machine to cause movement of the cam 44 and the operation 50f the fasteninginserting mechanism. The engage'me'nt of' the clutch is" effected, in a manner key 66 to rotate also.

will now be described. The machine is operated from a continuously driven gear 56 mounted to turn freely on the shaft 12. This gear is driven by apinion 58 arranged to turn with the driving pulley 60 of themachine. Upon the gear 56 is mounted the driving member 62 of the clutchf The driving member 62 is provided with teeth 64 by which it drives, through the action of a rotat- I able key 66, the driven member 68 of the clutch,

which driven member is keyed to the shaft 12 by which the machine is driven The rotatable key 66 is mounted and arranged to rotate in acylin- 'drical aperture in the driven member 68, the axis of the aperture being parallel with the axis of the shaft 12; The key -66 is provided with a longitudinal bore in which is positioned a longitudinally yielding plunger '70 having a radial arm '72. As the plunger is moved in the bore, the arm '22 slides inayslot '74 in the rotatable key 66 and when the arm '72 and plunger' are caused to rotate, such rotation of the arm'72 causes the The plunger is normally yieldingly positioned to the right in Fig. 2 by means of a compression spring '76 lying in an enlarged portion 78 of the longitudinal bore in the key. This spring 76 bears, at one end, against the end of the enlarged portion of the bore and, at

the other end, on a collar 80 pinned to the outer end of the plunger. Another means for rotating the key 66 is provided, which consists of an arm or lever 82, shown as integral with therotatable ,key 66 and provided at its outer end with'an offset cylindricalportion 84;

f" In order to cause engagement of the clutch, the arm 30 is moved as above-described,- by downward movement of the handle :16 after the fastening inserting mechanism has'b'een properly positioned, tocarry the controlling membe'r32 toward the shaft 12. This movement causes the beveled portion48-of the arm to engage the collar 80 and continued motion of the controlling member causes the yieldingplunger 70 and its arm '72 to move to the left in Fig. 2 until the'arm 72 is broughtinto the path of movement of a series of short pins 86 secured in and extending from the driving member 62. When one of these moving pins strikes the arm '72, the arm is rotated by the pin and this rotation of the arm rotates the key I 66-, through its contact with the side ofthe slot 74,

to operate the clutch, will not strike the .arm '72 until, the preceding tooth 64a has cleared, the segment 88. After it has so cleared, the pin 86a strikes the arm '72, causing it gradually torotate as the member 62 is rotating until, by the time the tooth 64b is about to strike the segment 88, the key has rotated to bring this segment into full bearingcontact withthe tooth 64b. The driven :memberz'68 .of 'the clutch'is now engaged'with the rivingImember'GZ (through the rotating keyfifi) and theclutch is started causing the collar 80 to .pass .out cit-contact with the controlling member 32. The arm' 72 then moves clear of the pin 86 with-which ithasbeenengaged, and is then out of the path of movement of all such pins because of the action ofthe spring 'lfigbut the rotatable key 66 still remains in clutch-engaging position, due to the pressure of the'tooth 64b thereon and ito .-the fact that there is'no force tending to -move it. In order to disconnect the clutch just before a acompleterevolution has been made so that the machine will drift to stopping position at'theend or one':revolution,-anadjustable stop cam 90 loeated upon a circuinferentially adjustable bush- "ing "92 is provided. Thebushing' 92,-after-being "adjusted-to cause the stop cam 90 to operate at the desired point, is clamped in adjusted position by ac'lamp screwj'94. shown in -Fig. 4, the cylindrical portion 84 of the arm 82 of the rotat- -able key 65 strikes the stop cam 90 and rotates "'the'key 66 gradually into non-engaging position '2 so that the teeth 64: of the driving member will pass beneath the segment 88. The rotatable key is maintained in this position by the friction of the arm '72 against the face of the driven member 68,-the friction'being produced by the spring "76. The drift of the machine carries the cylindrical projection 84 sufiiciently beyond the stop cam -90 so that the key'may be rotated for the next revolution when the arm "72 is again positioned in the path of the pins 86.

As the machine is stopping, the collar 80 is in the path of the controlling member 32 and this member is, pivotally mounted on the lever 30 so that it swings as the collar 80 strikes its side, and the clutch, therefore, cannot be reengaged until after the lever 30; is lifted to normal or neutral position to bring the controlling member 32 out of contact with the collar 80, after which the controlling member 32 swings back by gravity into its normal position relatively to the lever 30, as shown in Fig. I. This normal position is determined by a stop pin 96 on the controlling member 32, which pin comes in contact with a stop pin 98 positioned in the lever 30. The above mentioned lifting of the lever 30 takes place after -54) the cam 42 has relieved the pressure of the lever 30 on the radial cam surface 38. When this pressure is relieved and the hand lever 16 is released, the torsion spring 19, acting through the shaft 18, the lever 26 and connection 28, lifts the lever 30 free from the cam 34.- and the head 10 is then returned to inoperative position by the counterbalancing spring 14.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the ,60 United States is:

1. A starting and stopping mechanism having, in combination, a driving member, a driven member, a rotatable key, means by which the key may be rotated, and means on the driving member for .65 causing said first-mentioned means to rotate the key into clutch engaging position.

2. A starting and stopping mechanism having, in combination, a driving member, a driven member, a rotatable key, means by which the key may be rotated, means on the driving member for causing said first-mentioned means to rotate the key into clutch engaging position, and means to move the key into disengaged position.

3. A starting and stopping mechanism having,

in combination, a driving member, a driven member, a rotatable key, meansby which the'key may be rotated, m'eans on'fth'e ldriving m'e'mb'er for causing 'said 'first-meritionedmeans torotate the key into clutchi engaging position,"-'an adjustable member to move thel'ke'y'into disengagdposition, P

and means for securing :said: adjustable member in 'fixed -position'.to::efi'ect disengagernent ataipredetermined point in -the revolution-2 of the driven .Jmember.

4. A: starting .and' stopping mechanism having -in combination, a driv'ingm'ember, a driven member, a rotatable key, a'-plurality ofarm's bywhich 'the key mayberotated; a projection on thefdri'ving *m'ember for engaging oneof said'arms androtating the key in'to clutch engaging ipositionan'd'a fiite'd member for engaging another of said arms incombinatiom a driving'memben a' driven mem- ..be'r,-a rotatable key in the driven member, an arm by whichthe'keymay'be rotated, means for moving the 'armlongitudinally'of thekey,-'means on the driving member'forengaging the'arm and rotating the-key into'clutch' engaging position upen a longitudinal movement of the "arm, and-afixedm'ember to move the key into disengagedposi- 'tion at a definite-point inlthe revolution of the driven member.-

"7. In a clutch mechanism, a driving clutch member, a driven clutch memberya clutch'ke'y rotatable to form-a positive connection between said members and power drivenmeanszfor ro-v tating the key into clutch engaging position.

8. In a clutch mechanism, a driving clutch member, a driven clutch member, a clutch key rotatable to form a positive connection between said members, power driven means for rotating the key into clutch engaging position and power driven means for rotating the key into disengaged position.

9. In a clutch mechanism, a driving clutch 435 member, a driven clutch member, a clutch key rotatable to form a positive connection between said members, means extending radially from the key, and power driven means constructed and arranged to contact with said first-mentioned; means and rotate the key into clutch engaging position.

10. A rotatable clutch key having a longitudinal bore, a longitudinally yielding plunger in said bore, and a radial arm connected to said plunger r 35 by which the key may be rotated.

11. In a clutch mechanism, a rotatable clutch key having a longitudinal bore, a longitudinal yielding plunger in said bore, a radial arm connected to said plunger, and power operated means 1 40 for moving said arm to rotate the key.

12. In a clutch mechanism, a. rotatable clutch key having a longitudinal bore, a longitudinally yielding plunger in said bore, a radial arm connected to said plunger, a manually operated controlling member for moving the plunger with its arm longitudinally, and power operated means for moving said arm to rotate the key into clutch engaging position after longitudinal movement of 3150 the plunger has brought the arm into the path of movement of said power operated means. i

13. In a clutch mechanism, arotatable clutch key, power operated means for rotating thekey 2, 5 into clutch engaging position, a controlling member for rendering thepower operatedmeans ef- -fective to rotate the key into clutch engaging position, and. means for disengaging ,the clutch, said controlling member being constructed and arranged to prevent re-engagement of the clutch until after it haslbeen moved :to neutral position and repositioned in starting position.

14., In a'clutch mechanism, a rotatable clutch key havingza longitudinal bore, a longitudinally yielding plunger in said bore, a radial arm connected to said plunger; a controlling member for moving the plunger with its arm longitudinally, power operated means for moving said arm to rotate the key into clutch engaging position after longitudinal movement of the, plunger has brought'the arm into the path of,movement of said power means, and apivotal mounting for said controlling member whereby, after -it has "been operated and the clutch started, it will be inoperative to move the plunger until said member is returned to neutral position and then reposi- .tioned to move the plunger. 7 V

15. .In a clutchmechanism, a driving clutch member, a driven clutch member, a clutchkey rotatable to form a positive connection between said members, continuously moving means, and means .for connecting the continuously moving means with the key, to rotate the key into clutch engaging position.

1 '16. In a clutehmechanism, a driving clutch .member, a driven clutch member, a clutch key rotatable to form a positive connection between .said members, a member moving while the clutch is disengaged, and mechanismior causing said member to move the clutch key into clutch engaging position. 1 F I v positionand then to disconnect the same with" into disengaging position.

said tooth for rotating the key in timed relation .to the movement of said tooth for the purpose 17. Ina clutch mechanism, a rotatable clutch key, a member moving while the clutch is disengaged, means for connecting said member with the key to rotate the key into clutch engaging the key in said position, and means to rotate the key into disengaging position.

18. In a clutch mechanism, a rotatable clutch key, a member movingwhile the clutch is disengaged, means for connecting said member with the key to rotate the key into clutch engaging position and then to disconnect the same with the key in said position, and stationary means acting while the clutch is engaged, to rotate the key '19. In a clutch mechanism, a driving clutch member having a tooth, a driven clutch member,

a clutch key mounted in the driven clutch member and rotatable to form a positive driving connection with said tooth, a member movable. with of forming said driving connection, and means for temporarily connecting the key and the lastmentioned member to rotate the key for said purpose by the power of the driving clutch member.

20. In a clutch mechanism, a continuously ro- ..tating driving clutch member having a plurality 'of teeth, a driven clutch member, a clutch key mounted in the driven clutch member and rotatable to form a positive driving connection with any one of said teeth, a plurality of members each angularly spaced equally from a corresponding tooth and movable therewith for rotating said key in timed relation to the rotation of said teeth for the purpose of forming said driving conno nection, and means for temporarily connecting the key and any one of the last-mentioned members to rotate the key for said purpose bythe power of the driving clutch member. I I

- FREDC. EASTMAN.

Images