Патент USA US2408068код для вставки
Sept._ 24, 1946. H. A. HERZIG INERTIA ABSORBER 'Filed Nov. 30, 1943 2,408,057, , 2,408,057 Patented Sept. 24, 1946l UNITED "STA-TES. ' PATENT OFFICE „ Henry A.- Herzig, Port Washington, N. Y., assignor to Sperry Gyroscope Company,l Inc., a corpo ration of New York v Application November 30, 1943,'Serial No. 512,319 ( Cl. 192-4) 6 Claims. l the sine langles kover a complete 360° range. In other cases, it is `,necessary to move the cam in one direction from.0.° to 90°, then reverse the cam and move `it inthe opposite directionfromf90° This invention concerns an inertia absorbing ` ` device for use with a reversing mechanism to absorb the inertia of a load vduring operation of , the reversing mechanism, thereby relieving the _driving apparatus from inertia forces occurring `when theV direction of the load is reversed. , to 180°. i . The present invention is particularly `useful inconnection-with the latter type. of mechanism. ' A major object of the invention is to provide a Since the speed of movement of the cam remains mechanism operable synchronously with a revers constant, providing the rate of change of the ing mechanism for absorbing the inertia of a load during the reversing operation. . Y f 10 input angle is constant, but only the direction of the output is changed, any mechanical load AnotherV object of the invention is to provide driven by the output of the cam mustbereversed an inertia absorber actuated synchronously with from a given speed invone direction to the same an intermittently. operated reversing mechanism speed in an opposite direction.> Obviouslythis for stopping movement of an output member to` places a very heavy load on the computing device. absorb the inertia of Va loadv during the reversing operation. Y According to the present invention, the inertia g absorber operates synchronously with the re versal of direction toabsorb the inertia of the load independently of the computing device. As A further` object of the invention is to provide a computing mechanism with an inertia, absorber actuated synchronously with an intermittently operable reversing mechanism to absorb the in 20 ertia of the load driven by the computing mecha nism during the reversing operation. Other objects and advantages will become ap parent from the following specification taken in connection with the accompanying drawing, A f appliedto a trigonometric computing device, the reversing mechanism operates intermittently for each 90° change in the input angle. The `inertia absorber, in Vthe form of a stop cooperating with thev output shaft, operates synchronously with the operation of theì reversing mechanism to ar ' i ’ restA movement of the output shaft thereby ab wherein ' Fig. 1 is a perspective View of a sine computing sorbing the inertia of the load without interfer ing with the normal operation ‘of the computing mechanism embodying the invention in a pre ferred form, somevparts being broken away for purposes of clearness; . Fig. 2 is a side elevation of the stop mechanism in Fig. 1 showing the stop members positioned device. -„3.0 -for stopping rotation ofthe output shaft in one . The _invention is illustrated inthe drawing as applied toay sine computing unit utilizing a pin cam which is rotated according »to any given angle, and drives an output shaft according to ' the sine of the inputvangle. Thev direction of Fig. 3 is a similar side elevation of the stop .3_5 rotation of the pin cam must be changed for mechanism, but showing the stop members'posi- - > each ninety degrees of the input angle. Obvious Etioned for stopping rotation ofthe output shaft ly, the output member and its load is reversedat in the opposite direction. i Y y the same time. Without the provision of the inertia absorber, the pins`on the cam would have The present >invention is particularly useful in Aconnection with trigonometric computing de 40 to absorb the inertia forces of the load which are vices such as those for computing a, particular >quite large when it is realized that under certain trigonometric function of .an angle. One device conditions, the entire apparatus changes from a given speed in one direction to a corresponding for determining the trigonometric function of speed in the opposite direction. an angle is a cam Which may be rotated, or vother direction; and y " Y ' wisemoved, according to a particular angle, By As shown in Fig._1, an input shaft Il is driven ' properly laying out the surface of the cam, it may‘move a follower 'according to any predeter mined function of the angle according to which the cam is rotated. according to an angle the sine of which it is de sired to compute. of a`v sight for use in aiming guns or other objects c For example, from trigonometry?it is known 50 that the sine value _of an angle increases from ~ zero to unity for anglesv of from Ojto 90 degrees, Such al device may for ex ample be driven according to the azimuth angle toward a given target. In such a case, the sight may be'co'ntinuo‘u'sly rotated in one `direction for any number of revolutions, or it may be rotated ñrst in one direction and then in the opposite direction. >In any case, the shaft ll is constantly sible .to provide a cam surface which will compute V55 positioned ,according to the azimuth angle as ` and decreases from unity to zero for angles be tween 90 and >180 degrees.V It is sometimes pos 2,408,067 3 carries a gear I2 which meshes with a driving gear I3 on a sleeve I4 that is rotatable on, and The pins 35 on the pin cam 34 drive a follower gear 61 that is mounted on a square shaft (it shiftable longitudinally of a shaft I5. Clutch engaging members I1 .and I5, driven by the sleeve - I4, 4 each ninety degrees of the input angle repre sented by the position of shaft II. measured from a given reference. The shaft II and is slidable longitudinally thereof. In order to support the follower gear 61, a guide rod 59 may -be arranged to engage a guide member 1I are adapted to mesh with corresponding clutch members IS and 20 on gears 2| and 22, respectively, which are also rotatable on the slidable on the square shaft 68 to guide movement of the follower gear 61 as it slides along the shaft 58 to follow the spirally arranged pins 36. The shaft 68 `drives through gears 12 and 13 to rotate an output shaft 14 which may be uti lized to drive` any desired load represented dia grammatically at 15.v A stop member 11, in the vshaft I5. ' The gear 2|, when the clutch members I1 and I9 are engaged, drives through gear 23 on shaft 24 which rotates gear 25 to drive a broad-faced gear 25. The gear 25 is keyed to shaft 21 to drive bevel gear 25 which operates through bevel gear 29, shaft 3| and pinion 32 that meshes with 15 form> of a segmental projection, is mounted on the shaft 14 and is adapted to engage aninter a gear 33 on the periphery of a pin cam 34. ittently actuated stop 19 which is mounted on When the clutch members I8 and 20 are en gaged, as by shifting of the sleeve I4, the gear a shaft BI for intermittent movement synchro nously with the operation of the reversing mech 22 drives directly through the gear 25 and shaft 21 to rotate pinion 32 in the opposite direction 20 anism to stop rotation of the output shaft 14 as well as movement of the load 15. to its previous direction of rotation, whereby the The mechanism for intermittently actuating `direction of` rotation of pin cam 34A is reversed. the stop 19 consists of a Geneva accumulator As shown in the drawing, pins 5,5 on the face of the pin cam 34 are arranged in spiral fashion mechanism 83 that is similar to the accumulator to provide the desired sine function. 25 50 previously described. It consists of al series of Geneva mechanisms carried on parallel shafts The reversing mechanism is actuated, as will 84 and 35. The input of the Geneva accumulator be explained, according to the position of the in put shaft II, whereupon the, `sleeve I4 is shifted 83 isvdriven from shaft 14 asV by gears 86 and 81, which rotate segmental gear 88 and locking disc longitudinally of the shaft I5 to cause the shaft EI to drive the pin cam `(t4 in one direction. or 30 89, which cooperate with Geneva gear 9| on shaft 85, to intermittently'rotate segmental gear 92 and locking disc 53 of a `second Geneva mechanism. The segmental gear 92 rotates Geneva gear S3 on another, depending upon the angular input rep resented by the shaft II. As previously pointed out, the ydirection of rotation of pin cam 34 must the shaft 84, that drives segmental gear S4 and be reversed for each ninety degree change in the input angle; that is, the Pin cam 34 is driven 35 locking disc 95 which operate a Geneva gear 86 on the shaft 85. This Geneva gear 9‘6 drives-still in one direction for an input angle of from 0° another segmental gear 91 and locking disc 93 to 90°, but reversed for angles from 90° to 180°. This .procedure continues for each-ninety degree which operate a Geneva gear 99 on the shaft 54. rï‘his lat-ter Geneva gear intermittently ro change in the input angle. In order to operate the reversing mechanism 40 tates segmental gear IUI and locking disc |02, which cooperate with Geneva gear |03 to inter at each ninety degree angle, the input shaftk II mittently turn spur gear |05 on the shaft 85. has a bevel gear 4I meshing with a bevel gear 42 From this `description it will be apparent that that is freely rotatable on shaft 43 and drives the Geneva accumulator 33 is driven by the out a gear 44 which, in turn, ro'tatesa gear 45 that is rotatable on a shaft ¿Iii` arranged parallel to 45 put shaft 14 and operates to intermittently turn the gear |05 through approximately one quarter the shaft 43. The gear 45 operates through a of a, revolution for a given number of revolutions Geneva accumulator mechanism, designated of the output shaft 14. The gear |05 drives generally at 50, which intermittently turns the through idle gears |01 and |08 to turn a gear shaft 45. The shaft 45 thus turns reversing member 5I which engages collars 52 and 53 on 50 |09 which is ñxed to the stop 19 on the shaft 5I. In this manner, the stop 19 is also intermit the sleeve I4 to shift the sleeve together with tently turned through approximately one fourth the driving gear I3 longitudinally of the shaft of a revolution for a given number of revolutions I5. lThe gear 45 is keyed to a segment gear 41 of the output shaft 14. and a locking disc 48 which cooperate in a con When the output shaft 14 is rotated in a coun ventional manner with teeth 49, 49 to intermit 55 tently turn Geneva gear 55. terclockwise direction, as shown by the arrow The Geneva gear 55 is fixed to another seg ment 55 and locking Adisc 51 to intermittently operate Geneva gear 58, whiche in turn, operates another Geneva mechanism vincluding segment gear 59, locking disc 6| and gear 62. The gear 52 also actuates a Geneva mechanism including segment gear 53, locking disc 54 and gear 65, which is fixed on shaft 45. By appropriately ar ranging the gear ratios of the driving gear and the Geneva accumulator mechanism, it is pos sible to turn the shaft 46 through an angle of 180° to actuate the reversing member 5I thereby reversing the direction of the drive for the pin cam 34. As shown in the drawing, the reversing member 5I is turned through 180° in two steps of one-fourth of a revolution each lfor each ninety degree change in the input angle. The reversing in Figs. 1 and 2, the stop 19 is intermittently turned in a clockwise direction until the output ‘ shaft 14 reaches a position at which thev reversing 60 mechanism is actuated to reverse the direction of movement of the pin cam k34. At this instant, the stop 19 is operated by the Geneva mechanism 83 to move from position A, as shown in dotted line in Fig. 2, 'to position B, where it engages the 65 segmental stop engaging member 11'. As the stop engaging member 11 contacts> the stop 19, the inertia of the load 15 is‘ absorbed. by the two stop members 11 and 19, and is not trans mitted to the pins 35 on the pin cam 34 when it 70 reverses its direction of rotation. When the reversing mechanism reverses the direction of rotation of the pin cam 34, it also reverses the direction of the» output- shaft 14 and member 5| thereby actuates the reversing mech- , anism to reverse the ydrive of the pin Cam for the loadv 15', thereby immediately operating through the Geneva accumulator mechanism t0 2,408,067 5 6 rotate the stop 19 from position B to position A (Fig. 2). Asithe output shaft ‘f4 continues to rotate in the opposite direction, that is, a clock an »accumulator device driven by said output Ymember for operating said stopping means syn wise direction as shovvnby the arrow in Fig. 3, mechanism to arrest movement of said output it actuates the Geneva accumulator mechanism member during thek reversing operation. 83 to rotate the shaft 8l and stop 'It in a counter 2. In an apparatus of the character described, the combination of an input member, a pin cam driven thereby, a reversing mechanism connected clockwise direction to position C, as shownin dotted line in FiggB. ' ` 5 When the v‘output shaftl'fd. has been rotated in chronouslywith the operation of saidreversing between the input' member and pin cam for a clockwise ydirection to 'a position at which >the 10 changing the direction of movement of the pin cam relative to that of the input member, an out reversing mechanismr again changes the direc tion of rotation of the pin cam 34, whichr cor responds to the center position of the follower gear 59 on the pins 36, the Geneva accumulator put shaft driven from the pin cam, means for absorbing the inertia of the output- shaft on the operation of the reversing' mechanism compris 83 rotates the stop 19 from position C, to position 15 ing a first stop member positioned by the out put shaft, an accumulator driven by the output D, as shown in Fig. 3, where it engages the stop shaft, a second stop rmember intermittently engaging member 'Il to absorb the inertia of the - driven by the output of the accumulator into the load during the operation of the reversing mech ' anism. As soon as the direction of rotation of path of the first stop member, the accumulator the pin cam 3d is again reversed it begins rotating 20 being synchronized with the reversing mech anism and effective on the reversing operation output shaft M in a counter-clockwise direction thereof to position the second stop member so as so the stop member 'i9 is moved by means of the to be engaged by the first stop member, thereby Geneva accumulator mechanism 83 from position arresting the movement of the first stop member D to position C, from which point it is inter . mittently turned until `it reaches stop position 25 and the output shaft. 3. In an apparatus of the character described, B, as shown in Fig. 2, when the reversing mech anism is again operating. i the combination of an input member, a pin cam ` From the foregoing description it will be ap parent that the input shaft Il may continuously driven thereby, a reversing mechanism connected nously with the operation of the reversing mech operation of the reversing mechanism compris 'between the input member and pin cam for rotate in either direction As it reaches a point 30 changing the direction of movement thereof rel ative to the direction of the input member, an in its rotation corresponding to an input angle output shaft driven from the pin cam, a first stop ‘of 90°, reversing member 5l is actuated by theA member fixed to the output shaft, a Geneva ac Geneva accumulator 5t operating the reversing cumulator driven by the output shaft, and a sec mechanism to reverse the direction of rotation of the pin cam 3d together with output shaft 14, rel 35 ond stop member driven by the accumulator dis posed to be actuated thereby intermittently into ative to the direction of rotation of input shaft the path of the first stop member, the accumu I I. «At the instant of operation of the reversing lator being synchronized with the reversing mechanism, stop- ’i9 moves into position t0 con mechanism and effective on actuation thereof to tact stop engaging member 'H to'absorb the in ertia of the load 'i5 by stopping the movement of 40 position the second stop member so as to be en gaged by the ñrst stop member, thereby arresting output shaft M. This relieves the force of the the movement of the output shaft. jload’s inertia from the pins 38 on the pin cam 34, 4. In an apparatus of the'character described, - While the invention is described in connection the combination of an input member, a pin cam with a pin cam trigonometric computing mech anism for computing a sine of a given input 45 driven thereby, a reversing mechanism connected between the' input member and pin cam for angle, it should be understood that it may be changing the direction of movement of the pin applied to other types of mechanisms, in which cam relative to that of the input member, an it is desired to intermittently reverse the direc output shaft driven from the pin cam, means for tion of movement of an inertia load. The op eration of the inertia absorber stops synchro 50 absorbing the inertia of the output shaft on the anism relieves the'strain due to the inertia of thel load from the driving mechanism and avoids damage thereof. , Since many changes could be made in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it‘is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense. ing a first stop member fixed to the output shaft, an accumulator comprising a Geneva mechanism driven bythe output shaft, a second stop mem ber intermittently driven by the output of the ac cumulator into the path of the first stop member, the accumulator being synchronized with the re versing mechanism and effective on the operation thereof to position >the second stop member so as to be engaged by the first stop member, thereby arresting the' movement of the first stop member and the output shaft. 5. In an apparatus of the character described, the combination of an input member, a pin cam described, the combination of an input member, 65 driven thereby, a reversing mechanism connected between the input member and pin cam for a pin cam driven by said input member, a revers What is claimed is: 1. In a computing mechanism of the character said input member for intermittently actuating said reversing mechanism to change the direction changing the direction thereof with respect to the input member, an output shaft driven from the pin cam, means for absorbing the inertia of the output shaft on reversal of the direction of the pin cam comprising a first stop member fixed to the output shaft, an accumulatorY comprising a of movement of said cam, an output _member Geneva mechanism -driven by the output shaft, ing mechanism connectedY between said input member and said pin cam for changing the direc tion of movement of said pin cam relative to said input member, an accumulator device driven by a second stop member driven in a direction op driven by said pin cam, stopping means for ar resting movement of _said output member, and 75 posite to that .ofV the first intermittently into the 2,408,067 7 path 0f the ñrst stop member by the output of the accumulator, the accumulator being effective at they time of the reversing- operation of the reversing mechanism to position the second stop member to arrest the ñrst and thereby arrest the output shaft. 8 of the pin cam relativeV to the-input member, an accumulator device driven by ther input member for intermittently actuating the reversing mech 6. In a computingv mechanism for computing functions of angles, the combination of an input anism to change the direction of movement of the cam, an output member driven by the pin cam, stopping means for arresting the movement of the output member, and an accumulator device driven by said output member for operating the member displaced in accordance with the angle stopping means synchronously with the opera of which the function is to be computed, a pin cam laid out according to the function to be com ment of the output member during the reversing puted displaced by the input member, a reversing operation. mechanism connected between the input mem ber and the pin cam for changing the direction tion of the reversing mechanism to arrest move i HENRY A. HERZIG.