US1968873A - Starting and stopping mechanism - Google Patents

Description

Aug- 7, 1934- A. s. CLARK STARTING AND' S'I'OPPIGl MECHANISM Filed Nov. 7. 1932 2 Sheets-Sheet 1 Aug. 7, l1934. A. s. CLARK 1,968,873

STARTING AND STOPPING MECHANISM Filed NOV. 7, 1952 2 Sheets-Sheet 2 Patented Aug. 7, 1934 filinirsollsrArss rlArENIi yio'rs1/csi":

y 1,968,873 STARTING AND s'rorPiNG" MECHANISM Alfred S. Clark, Beverly, Mass., assigner to United Shoe Machinery Corporation, Paterson, N. J.,'a. corporation of New Jersey Appiication November 7,1932, Serial No. 641,539

10 Claims. (Cl. 1921-144) This invention relates to a starting and stop- Another feature of the invention comprises a ping Amechanism and is illustrated as embodied release lever for the locking ,liever Whichisarin a maohine Daltoularly adapted for use in ranged to be automaticallyV disconnected `from inserting ,paper pegs in the manufacture of the :locking lever after the clutchhas been boots and Shoes,` although it may Conveniently tripped so `that the locking lever will operate be Used ih many other types 0f moehnes. during the first revolution of the machine :to

The invention is illustrated as used in a paper lock the abutment lever land .cause the driven -Deg `inserting machine of the type illustfoted part of the machine to operate through the and described in U. S. Patent No. 1,802,900, block to disconnect the clutch and .apply Vthe .W granted April 28, 1931 on an application filed brake atthe completion of `one revolution. If 65 in thenameszof-Fred N. La Chapelle and Fred desired, `this feature of the invention, relating C- Eastman, and it Was designed especially to be to the `autorisatie disconnection lof the 'release substituted for the Starting and stopping mechlever from'. the locking lever, maybe omitted so aniSmShoWIl and described in Said Datent- IIl that the release lever will hold the locking lever lo foot, many of the parts used in the Starting and out of contact with the abutment lever `as long '13"' Stopping `Hloohillsfrl of that moohhe are lltas the operator Wishes the .machine to run. lized inthe illustrated machine, which consti- The machine is then stopped at the will of the tutes a preferred embodiment of the Dl'eSeIlt operator by withdrawal of `the release-lever to invention. normal position, Which permits the 'abtument 2o It is the object of the 'invention to improve lever to become locked'andtnermacnine toibo "te and simplify starting and stopping mechanisms stoppedin the `same manner as when the mechof, for example, thetvpe used in the Laohapelle anism `is operating as a one-revolution clutch, and Eastman machine and to make the adjust- .in themanney above described Y -3 ment of the Same Ilot only easier'but more With the above and. other obj'ects andreareliable. i tures in view, Lthe invention will now be described With the above lobiectin view,l a feature of 'in connection with the illustrated `machine and the invention consists of Ja block which is moved `will be pointed out inthe accompanying claims. in opposite directions ih Substantially a con- The invention is not limited for use `in the vparstant path, which is substantiallva straight ocular type of vinfiachineherein illustrated bui-is 30 line, by a driven part of any machine in which only 'limited as donned in the-appended claims. 85

the present invention may be incorporated. In the drawings,

This block is arranged to be either eiTective or Fig, 1 is a, View showing a, portionof the ma,- ineiiective `to transmit motion between said 'chine of the Lachapelle and Eastman patent driven part of the machine and amecharsm with theimprovedstartingandstoppingmecha- 35 which controls a clutch andra brake. The block nism of the present invention substituted for the 90 is made ineffective to transmit the above motion corresponding mechanism used in Ythat machine; because of a lost-motion connection arranged 'the parts being shown in the position that they thereon and, when it is necessary for the block `occupy when `the machine has beenstopped by to transmit positive motion between the abovethe mechanism;

40 mentioned parts, the lost motion is taken up by Fig. 2 is a detail of the mechanism'just after 95 a take-up mechanism. Preferably,` and asil- 'the machine has beentripped and beforethe lustrated, this take-up mechanism consists of machine has actuallystarted to move;` .i an abutment lever mounted on the block. This Fig. 3 is a detaiLsimilar to Fig. 2, but with abutment lever may be locked so that the block -the parts of the mechanism in an intermediate t5 will be effective to transmit positive motion or position.; .i -v L f' 100 it may be unlocked so that theblock is yield- Fig. 4 is a detail, similar'to Fig. 2, but swith ing and ineiectivev to transmit this motion. the parts locked, or` in` the position shown in When the abutment lever is unlocked, the usual Fig. 1; and

clutch spring in the machine acts to release the Fig. 5 isA a` detail of a modified. construction,

brake and engage `the clutch to drive `the `mawith the parts in the position that they occupy chine. On the other hand, when the abutment While the machlneis being drivencontinuously. lever is locked, the block is effective to transmit Only as much of the LaChapelle and Eastman positive `motion from the driven part of the mamachine Will be described as is necessary for a chine in a direction to disconnect the clutch and complete understanding of the invention. It

` should be noted that themachine, when equipped 110 iii @5 apply the brake.

with the improved starting and stopping mechanism of the present invention, operates in the same manner as described in said patent.

Suitably journaled in the head of the machine is a shaft 50 (Fig. 1) having fast upon its forward end a group of cams preferably formed as a unit and indicated by the numeral 52. Fast upon a sleeve 54 rotatably mounted upon the shaft 50, but secured against endwise movement, is a clutch member 56 to which is rigidly secured a beveled gear 58 meshing with a beveled gear 34 by which the clutch member is driven. Slidably but non-rotatably mounted upon the shaft 50 is a clutch member 60 having a clutch face 62 arranged to be moved into and out of engagement with the adjacent face of the clutch member 56 and a brake surface 64 correspondingly moved out of and into engagement with a stationary brake surface 66 formed upon the head of the machine. To prevent the clutch member 60 from rotating on the shaft 50, the forward end of the clutch member is provided with a plurality of projections 68 telescoping with corresponding projections 'l0 formed upon the rear of the cam member 52 and thus fast upon the shaft 50. Clutch member 60 is also formed with a collar 72 forming an abutment at the rear end of a stiif coiled spring '74 surrounding projections 68 and '70 and bearing at its forward end against a plane surface formed upon the rear of the cam member 52, the spring '74 thus tending to move the clutch member 60 rearwardly into power transmitting position.

Threaded upon and rigidly clamped to the clutch member 60 is a collar '76 to the rear of which is a hub '78. By means of the threads, the collar and its hub may be adjusted axially of the clutch member 60. The hub '78 is provided with a pair of pins on opposite sides of the shaft 50 which engage hooks formed on the upper end of a lever 82 fulcrumed at 84 to the head of the machine. Thus, whenthe lever 82 is held in the position shown in Fig. 1, the spring '74 is compressed and the clutch member 60 is maintained in its forward or nonpower transmitting position while, when the lever 82 is rocked, by mechanism -hereinafter described, in a counter-clockwise direction from the position of Fig. 1, the clutch member 60 is moved rearwardly by the force of the spring 74 into engagement with the continually driven clutch member 56 and thus becomes effective to transmit power to the cam member 52.

The above reference characters are the same as those used in the LaChapelle and Eastman patent, to which reference should be made for a description of the parts relating to the fastenerinserting mechanism.

The illustrated machine is arranged to be started by upward displacement of a nozzle accomplished by pressure of the work against the nozzle. For this purpose the nozzle 100, which is mounted for vertical slidable movement, carries a pin 102 positioned in a slot formed in the forwardly extending arm 103 of a bell-crank lever 104 fulcrumed at 106 on the head of the machine. An upwardly extending arm 107 of the Ybell-crank lever 104 is connected by an adjustable link 108 to the upwardly extending arm 110 of a second bell-crank lever 112 fulcrumed at 114 on a movable block 126. The bell-crank lever 112 has a horizontally extending arm 127, the purpose of which will presently be described. The block 126 is moved back and forth by a rod 128 sliding in ways in the head of the machine and operated by a cam 130, cut in the cam member 52, and a cam roll 132 mounted on the rod 128. The rear end of the block 126 is provided with a slot 140 which forms a lostmotion connection with a pin 142 (which corresponds to the pin 250 of the LaChapelle and Eastman patent) mounted in the lower end of the lever 82.

Briey outlining the construction about to be described, and referring to the drawings, it should be noted that, with the block 126 held in fixed position, (as is the case when the machine is in stopped position) lost-motion of the pin 142 in the slot 140 will permit the lower` end of the lever 82 to move forward (to the right in the drawings) under the iniuence of the spring '74, to release the brake and engage the clutch to start the machine. On the other hand, if the bloei-1 126 has been carried forward by the cam 130, (as is the case after the machine has been started) and a fixed abutment is then positioned in the forward end of the slot, subsequent movement of the block 126 to the rear will move the lever 82 to disengage the clutch and apply the brake.

1n order to provide means whereby the pin 142 and slot 140 may, at times, have lost-motion relatively to one another and, at other times, have this lost-motion taken up and a iixed abutment placed in the forward end of the slot, the rear end of the block 126 is provided with a vertical groove so that two rearwardly extending forks are formed, between which an abutment lever 150 is pivotally mounted at 152. The upper end of the abutment lever 150 is continuously maintained in engagement with the pin 142 by a plunger 154 mounted in the block 126 and pressing against the abutment lever 150 by means of a spring 156 inserted in a bore in the block 126 behind a shoulder on the plunger 154.

To lock the abutment lever 150 so that movement of the block to the rear will be transmitted through the pin 142 to the lever 82, a locking lever 158 is pivotally mounted at 160, between the rearwardly extending forks of the block 126. This locking lever 158 is urged upwardly by a spring 162 connected between a pin 164 on the locking lever and a pin 166 mounted in the block 126. When the rod 128 is moved to the rear it carries with it the block 126 and, as the pin 142 is then stationary, the spring-pressed plunger 154 rotates the abutment lever in a counterclookwise direction so that the lower end of the abutment lever moves to the right and permits the locking lever 158 to move upwardly, by its spring 162, behind the abutment lever 155 and lock it against clockwise rotation. This position of the parts is shown in 4, with a notch 168 near the forward end of the locking lever in engagement with the lower end of the abutment lever 150. Lost motion is thus taken up and the block 126 is now effective to transmit positive motion from the rod 128 to the pin 142 when the rod 128 is moved to the rear. movement of the block 126 to the rear thus carries the pin 142 with it, from its dotted line position in Fig. 4 to the position shown in section, and the upprr end of the lever 82 is moved to the right to disengage the clutch and apply the brake.

The machine, as stated above, is started by an upward displacement of the nozzle 100, which motion is communicated through mechanism previously described, to give a downward move- This ,y

lil@

jiment tto ithe .arm 127 of the bell vcran'lrflever :112,

.which `is lpivotally mounted on vthe gblock ,126.

`lhelower end of the release lever`170 is prol vided with-.a surface 172 which, in the :stopped @position-lof the lmachine (Fig. 4) is Alocatedtimmediately above a projection 17a-on 'the ,locking leverl8. Downwardvrrrovementiof the bel1- .c1ankarm 127, :(lproduced by lifting .the .nozzle 11100.), carries :the release ,lever 'downwar ly and thus unlocking the abutment lever. Flower end. of the .abutment lever unlocked, the

theengagementlofthe surface i172 with the pro jection I1.74. carries'cthe V.locking ,lever 158 downn svardly to Acarry nits notch 168 out of engagement with the slower end .of the abutment 'lever 150, With the pin 142 is free to moveto .the .right/'in the slot 140, from its dotted iline position in Fig. 2 to the position `shown in section, because the force or the spring 74 is suilicient to overcome the Aslight `resistance of `the spring-.pressed plunger 154 .against the Aabutment lever 150. Thus the lever .182` :swings c ounterclockwise under the influence fblock 126. .As the rel-ease lever is carried downwardly (by .upward lmovement of the nozzle Y the cam :surface 176 disengages the lower J lend 172 Aof the release lever 178 from the projection 174, just after the abutment lever` i hasbeen unlocked, so that the rlocking lever is `freevto move upwardly under the influence of itsspri-ng 162` until it-meets the lower end of thexabutment `lever 1507. This position of the mechanism isshown inFig. 3. As the machine is now inoperation, `the vcam 130 is carrying the rod 128 and block 126 forwardly, so the abutment lever 150, being maintained in contact with Y the pin 142 by the spring pressed plunger. 154 is rotating counterclockwise. This soon allows the locking `lever to move upwardly and permit Yits notch 168 to lock the abutment lever, as :shown in Fig. 4.

It Ashould `be noted that the locking lever 158, with this arrangement, is always lifted to lock the .abutment lever, irrespective of the manipulation of: the nozzle 1004 in tripping the ma chine, because the rod 108 iseither moving to the 'rearroris `substantially,fixed in position at the time the tripping occurs and the rod 128 is moved forwardby the cam 130, thus the pivot 114 of the bell-crank lever 112 is moved orwardly, rotating the bell-crank lever still further in a counterclockwise direction so that its arm 127 is further depressed, carrying the release lever 17() always downwardly Ia suflicient distance for the cam surface 176 to disconnect the release lever from the locking lever 158. Thus the release lever can never interfere with the return upward movement of the locking lever 158 under the action of its spring 162` In order that the cam surface 176 and projection 178 may be eiective to operate as above described, the release lever is urged to the rear by a tension spring 180 stretched between the pin 166 and a pin 182 secured to the lower end of the release lever 170.

When it is desired to incorporate the present invention in a machine which is driven for a `.nurr-iber fof revolutions and is .stopped only at the will .of the operator, a release lever I170a is provided without the .cam surface 176. la construction `is illustrated `in Fig. 5. .such circumstances, .the `arm 127 of the bel*- Such Under crank lever 112 would be moveddownwardly by movement of the adjustable link 108, which,..instead Aoi being connected to a nozzle, would be vconnected to any :suitable operator-controlled device, such as a treadle, and would beheld in.

this position as long as the operator wishes the machine to run. The release lever would thus lhold the looking lever 158 out `of engagement 'with .the abutment lever 158 during thisperiod,

as shown in Fig. 5. When Y'the operator `desiresl `to stop the machine, the `arm 127 would be raised, by 'the operator-controlled means, and would carry with it the release lever 17021. The locking lever 158 would follow it to a raised position behind the abutment lever,` locking the yabutment lever and causing the machine toy stop at the completion of that revolution, as here- 4inbefore described.

It will be noted that, with the present invention, the only adjustments necessary are, first: the adjustment or the adjustable link 108 for length so that upward movement of the nozzle 100 will be more or less sensitive to trip the machine, and second: the .adjustment of the lcollar 76 to cause the lever 82 to operate the@ clutch member 6G with the desi-red motion to obtain suitable action of the brake.

Having thus described my invention, what Vclaim as new and desire to secure by Letters Patent of the United States isz- 1. A connection for contrcllingaV clutch and brake mechanism comprising a block, means at one end of the block for connecting it to a reciprocating part oramachine, means vat the other end of the block for connecting it to a clutch `and brake mechanism, these means acting to cause the block to move in substantially a straight lineV only, and means mounted on the block for rendering the block either a yielding or a non-yielding 4connection between the reciprocating part of .the machine `and the clutch and brake mechanism.

2. A connecting mechanism for controllinga clutch and brake, having, in combination, e

block, means for moving the block in opposite idirections in substantially a constant path, an abutment member mounted on the block, means to render the abutment member either yielding or lnon-yielding whereby, when it is rendered yielding, it will-permitthe brake to be disengaged and the clutch to be engaged and, when it is rendered non-yieldinginovement of the block in one direction will cause the clutch to be disengaged and the brake to be applied.

3. A connecting mechanism for controlling a clutch and brake, having, in combination, a block, means for moving the block in opposite directions, an abutment member mounted to move in opposite directions relatively to the block, means acting to either prevent or permit such relative movement, the abutment member acting, when such relative motion is permitted, to permit the brake to be disengaged and the clutch to be engaged, and acting, when it is prevented, to cause movement of the block in one direction to disengage the clutch and apply the brake.

4. A connection for controlling a clutch and brake mechanism comprising a block, an abutment lever' pivotally mounted on the block,

spring operated means for swinging the lever into yielding abutting position, a locking lever, a spring for bringing the locking lever into position to locll. the abutment lever in unyielding position, a release lever for moving the locking lever out of locking position, a bell crank lever pivotaily mounted on the block and carrying the release lever, and means under control of the operator for swinging the bell crank lever to operate the release lever.

5. A connection for controlling a clutch and brake mechanism comprising a block, an abutment lever pivotaliy mounted on the block, spring operated means for swinging the lever into yielding abutting position, a locking lever, a spring for bringing the locking lever into position to lock the abutment lever in unyielding position, a release lever for moving the locking lever out of locking position, a cam for disengaging the release lever :from the looking lever after the locking lever has been moved out of locking position, a bell crank lever pivotally mounted on the block and carrying the release lever, and means under control of the operator for swinging the bell crank` lever to operate the release lever.

6. A mechanism for controlling a clutch and brake comprising a block, a joint at one end of the block for connecting it to a moving part of a machine, a joint at the other end of the block for connecting it to a clutch and brake mechanism, one of said joints having lost-motion, take-up means mounted on the block for taking up the lost-motion to permit movement of the moving part of the machine to be transmitted to the clutch and brake mechanism for stopping the machine, and means to restore the lost motion condition to the one of said joints.

7. A mechanism for controlling a clutch and brake comprising a biock, a joint at one end of the block for connecting it to a part of a machine which is movable in opposite directions, a joint at the other end of the block for connecting it to a clutch and brake mechanism, one of said joints having lost-motion, and take-up means mounted on the block for taking up the lost-motion upon movement of the block in one direction so as to permit movement of the block in the opposite direction to transmit motion to the clutch and brake mechanism to disconnect the clutch and apply the brake.

8. A mechanism for controlling a clutch and brake comprising a block, a joint at one end of the bloclr for connecting it to a part of a machine which is movable in opposite directions, a joint at the other end oi the block for connecting it to a clutch and brake mechanism,

one of said joints having lost-motion, take-up means mounted on the block for taking up the lost-motion upon movement of the block in one direction so as to permit movement of the block in the opposite direction to transmit motion to the clutch and brake mechanism to disconnect the clutch and apply the brake, and means to start the machine by rendering the take-up means inoperative.

9. A connecting mechanism for controlling a` clutch and brake having, in combination, a clutch and brake controlling lever, a block, means for moving the block in opposite directions, an abutment lever pivotally mounted on the block, spring operated means for swinging the abutment lever against the controlling lever, a locking lever, a spring operating when the block is moved in one direction to bring the locking lever into position to lock the abutment lever in unyielding position whereby, when the block is moved in the other direction, positive motion will be transmitted from the block moving means to the clutch and brake controlling lever to disengage the clutch and engage the brake, a release lever for moving the locking lever out of locking position to permit the clutch and brake controlling lever to release the brake and engage the clutch, and means under control of the operator for operating the release lever.

l0. A connecting mechanism for controlling a clutch and brake having, in combination, a clutch and brake controlling lever, a block, means for moving the block in opposite directions, an abutment lever pivotally mounted on` the block, spring operated means for swinging the abutment lever against one end of the controlling lever, a locking lever, a spring operating when the block is moved in one direction to bring the locking lever into position to lock the abutment lever in unyielding position whereby when the block is moved in the other direction positive motion will be transmitted from the block moving means to the clutch and brake controlling lever to disengage the clutch and engage the brake, a release lever for moving the locking lever out of locking position to permit the clutch and brake controlling lever to release the brake and engage the clutch, a cam for disengaging the release lever from the locking lever after the locking lever has been moved out of locking position, a bell-crank lever pivotally mounted on the block and carrying the release lever, and means under control of the operator for swinging the bell-crank lever to operate the I' release lever.

ALFRED S. CLARK.

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