US3024535A

US3024535A - Motion conversion device

Info

Publication number: US3024535A
Application number: US827209A
Authority: US
Inventors: Rabenau Manuel Von
Original assignee: Individual
Current assignee: Individual
Priority date: 1957-04-15
Filing date: 1959-07-15
Publication date: 1962-03-13
Anticipated expiration: 1979-03-13

Description

March 13, 1962 M. VON RABENAU 3,024,535

MOTION CONVERSION DEVICE Original Filed April 15, 1957 3 Sheets-Sheet 1 Fla. 2

IN V EN TOR. -MA/W/L Vwv/iABE/vnu Arron/vs vs March 13, 1962 M. VON RABENAU MOTION CONVERSION DEVICE Original Filed April 15, 1957 5 Sheets-Sheet 2 IN V EN TOR. MANUEL V0/vRABE/mu B %Q70A&A M

ATTORNEYS March 13, 1962 M. VON RABENAU 3,024,535

MOTION CONVERSION DEVICE Original Filed April 15, 1957 5 Sheets-Sheet 3 7 En 4 'IIIIIIIIII IIIIIII u- TIIIII/III III/111A IN VEN TOR. MANl/EL Va/vAABEA/Au /4T TaRNE Ks United rates i atent 3,024,535 MUTEON QQNVERSEUN DEVICE Manuel von Rahenau, 3260 Sandeen Road, St. Paul, Minn.

Originai application Apr. 15, 1957, Ser. No. 652,787, new Patent No. 2,895,258, dated July 21, 1959. Divided and this application July 15, 1959, Ser. No. 827,269

12 Claims. (Cl. fil -15) This invention relates to a motion conversion device by which rotary motion is utilized to impart predetermined longitudinal and transverse movement to a carrier arm. More particularly, this invention relates to a motion conversion device adapted for installation in the body and arms of a doll whereby rotary motion may be utilized to impart a predetermined longitudinal and transverse movement to a carrier arm to enable the doll to draw or write, as described and claimed in my co-pending application Serial No. 652,787, filed April 15, 1957, now Patent No. 2,895,258 granted July 21, 1959, of which this application is in part a division.

The principal object of this invention is to provide a motion converter including a double track cam which upon rotation imparts a predetermined longitudinal and transverse movement to a carrier arm guided by cam followers in or on the tracks of said cam.

Other objects of the invention will become apparent as the description proceeds.

To the accomplishment of the foregoing and related ends, this invention then comprises the features hereinafter fully described and particularly pointed out in the claims, the following description setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principles of the invention may be employed.

The invention is illustrated by the drawings in which the same numerals refer to corresponding parts and in which:

FIGURE 1 is a top plan view of one form of the motion converter of this invention;

FIGURE 2 is a rear elevation, partly in section, of the device of this invention;

FIGURE 3 is a right end elevation, partly in section, of the motion conversion device;

FIGURE 4 is a plan view of one form of a double track cam showing the configuration of the tracks for the writing of the word Ma by a doll in which the device is installed;

FIGURE 5 is a representation of a doll showing schematically the manner in which the unit of this invention is incorporated in the dolls body to produce a mechanical writing doll;

FIGURE 6 is a top plan view of a slightly modified form of motion conversion device according to this invention;

FIGURE 7 is a vertical elevation through the cam disk of the modified form of motion conversion device;

FIGURE 8 is a plan view of a modified form of double track cam which may be utilized in the device of this invention; and

FlGURE 9 is a vertical section through the cam of FIGURE 8 taken on the line 99 and in the direction of the arrows.

Referring to the drawings, and particularly to FIG- URES l, 2, and 3, there is shown a box-like frame or housing indicated generally at 10 and including a front wall 11, a rear wall 12, a right end wall 13, and at left end wall 14. Journaled for reciprocatory motion in the upper portion of the housing frame lltl between the front wall 11 and the rear wall 12 is a lateral or transverse motion carrier indicated generally at 15. The lateral or transverse motion carrier 15 includes a right hand hori- 3,@Z4,535 Patented Mar. 13, 1962 zontal bar or rod 16 slidably supported in openings in the front and rear walls of the housing and a left hand bar or rod 17 similarly mounted and parallel to the first.

Rods

16 and 17 are connected by a pair of spaced parallel horizontal bars or

rods

18 and 19 to form a rigid transversely reciprocating unit.

Supported on the front and

rear rods

18 and 19 of the transverse motion carrier 15 is a longitudinal motion carrier indicated generally at 20. The longitudinal motion carrier 20 includes a carrier base 21, a right hand end member 22 secured to the base, and a left hand end member 23 secured to the opposite end of the base. The

end members

22 and 23 are provided with guide ways for

rods

18 and 19 so that the entire carrier 20 is slidably movable longitudinally along

rods

13 and 19 while movable transversely with the transverse carrier frame 15.

A relatively long curved rigid carrier arm 24 is mounted in the right and

left end members

22 and 23 for longitudinal movement with the longitudinal motion carrier 2%. Carrier arm 24 carries a stylus 25 at its outer extremity. Arm 24 is journaled in the

end members

22 and 23 for slight pivotal or rotational movement with respect to the longitudinal motion carrier 20 but it is secured by means of locking collars 26 so as to move longitudinally with the carrier 2%.

Another arm 27 is fixedly secured to the housing 10 on the side opposite from the movable carrier arm 24. Arm 27 carries a pad 28 at its outer extremity. Pad 28 is so positioned that its upper surface and stylus 25 are in contact during operation of the motion conversion device.

Movement is imparted to the

carriers

15 and 20 by means of a double track disk cam indicated generally at 2%. Cam 29 is mounted to rotate with a gear Wheel 30. Cam 29 and gear 3% are supported for rotation in a horizontal plane on a cross member 31 positioned between the front and rear walls of the housing 10 below transverse motion carrier 15. Cam 29 is provided with two tracks on its upper surface, an outer track 32 which controls transverse movement of both of the

carriers

15 and 20 and carrier arm 24- and an inner track 33 which controls longitudinal movement of longitudinal carrier 26 and the carrier arm.

Transverse movement is imparted to the carriers 15 and 2e and carrier arm 24- by means of an outside cam follower 34 which is supported in a slotted bracket 35 supported on the inside of front wall 11 of the housing above the top surface of the cam disk. Cam follower 34 is restrained against vertical movement and held within the confines of the slot in bracket 35 by means of suitable collars 36. An arm 37 extends from the upper end of the cam follower 34 to the transverse motion carrier 15. The inner end of arm 37 is secured to the front horizontal bar 18 of the transverse motion carrier. It will be apparent that the same transverse motion imparted to carrier 15 will likewise be imparted to the longitudinal motion carrier 20.

Longitudinal motion is imparted to the longitudinal motion carrier 20 and arm 24 by means of inside cam follower 39 moving in the inner track 33 of the cam 29. Cam follower 39 is supported by means of collars 40 in a slotted bracket 41. The upper end of cam follower 39 moves in a transverse slot 42 on the lower surface of the base 21 of the longitudinal motion carrier 20 to permit simultaneous transverse and longitudinal movement of carrier 20.

Exemplary means for providing rotational motion to the gear wheel 3d and cam 29 are provided as follows: A horizontal shaft 43 provided with a crank handle 44 is journaled in th

end walls

13 and 14 of the housing 10 below the cam disk and gear wheel 30. A gear wheel 45 .3 raving teeth which mesh at right angles with the teeth of gear wheel 30 is keyed to shaft 43. Rotation of crank 44 causes rotation of the horizontal shaft 43 and the gear wheel 45. This in turn causes rotation in a horizontal plane of gear wheel 30 and cam 29.

As the cam 29 rotates, the outer cam follower 34 rides in the outside cam track 32. The movement of the cam follower 34 is limited by the slot in bracket 35 in which the cam follower is held by collars 36. Accordingly, the movement of cam follower 34 is restricted to a path in a horizontal plane. That path is parallel to the

side Walls

13 and 14 of the housing and perpendicular to the front wall 11. By means of the arm 37 which connects the upper end of the cam follower 34 to the lateral motion carrier 15, that carrier is reciprocated in a lateral or transverse direction while sliding on the ends of the

rods

16 and 17.

Simultaneously with the movement of the outside cam follower 34 in the outside track the inner cam follower 39 is moved as it runs in the inside track 33 of the cam 29. It will be noted that the slot in bracket 41 is in the same plane as the slot in bracket 35 and disposed at a right angle thereto. Th inner carn follower 39 is supported in the slot in bracket 41 and its movement is restricted to a back and forth movement in a horizontal plane in a direction parallel to the front and

rear walls

11 and 12 of the housing and perpendicular to the end wall 13.

The upper end of the inner cam follower 39 rides in a transverse slot 42 in the bottom of the carrier base 21 of the longitudinal motion carrier. motion carrier is reciprocated back and forth under influence of outer cam follower 34 and the outer track 32 of the cam, the upper end of cam follower 39 moves freely in slot 42. When a longitudinal movement is simultaneously imparted to the longitudinal motion carrier by means of inside cam follower 39 riding in the inside cam track 33, the entire longitudinal motion carrier 20 slides on

parallel rods

18 and 19 of the lateral motion carrier 15. As the longitudinal motion carrier is thus moved in both a lateral and simultaneous longitudinal direction, the carrier arm 24 and the stylus 25 are moved laterally and longitudinally so as to inscribe a predetermined inscription.

In the illustrated embodiment of the invention the configuration of the cam tracks 32 and 33, as shown most clearly in FIGURE 4, will cause the stylus 25 to inscribe the word Ma. The cam and the stylus are shown in their starting position. In this position the outside cam follower 34 is positioned at line A and the inside cam follower 39 is displaced by 90 at line D. As the cam rotates counterclockwise the distance between line A and line B, the outer cam follower 34 is pulled inwardly as it rides in the slotted bracket 35 and pushes the entire transverse motion carrier 15 inwardly and along with it the entire longitudinal motion carrier 20 and the carrier arm 24 and stylus 25. The result of this motion is to cause the stylus to form the initial downstroke of the script M. Th motion is virtually entirely transverse with little or no longitudinal motion.

As the cam rotates counter-clockwise a further distance represented by the space between lines B and C, the first upstroke of the M is formed. As the outer cam track moves relative to the cam follower the distance from line B to line C, the follower 34 moves outwardly in the slotted bracket and pulls with it the transverse carrier 15 and along with carrier 15 the longitudinal motion carrier, carrier arm and stylus. At the same time the inner cam track 33 is being moved relative to the cam follower 39 a distance from line B to line F. As line F is approached, the follower 39 is engaged by a protuberance on the outer edge of the inside cam track and a slight simultaneous longitudinal motion is superimposed upon the transverse motion to form half of the arc of the first loop of the script M.

As the cam disk is rotated farther, the outside cam follower 34 is moved relative to the cam between line C and Thus, as the transverse line D and at the same time the inside cam follower 39 is moved relative to the cam from line F to line G. Initially in this segment of the cam there is imparted a simultaneous longitudinal and transvers motion to form the descending arc on the first loop of the script M and thereafter there is transverse movement only while the second downstroke is formed. As the outside cam follower 34 is moved relative to the cam track from line D to line E to line F, the inside cam follower 39 is moved relative to the cam disk from line G to line H to line I and the second complete loop of the script M is formed.

As the outside cam follower 34 is moved relative to the cam disk from line F to line G, the inside cam follower 39 is moved from line I to line G and the first upstroke of the small script 0 is formed. This involves both transverse and longitudinal motion as the stylus inscribes an upwardly sweeping curve. The first half of the loop of the letter a is formed while the cam follower 34 moves from line G to line H and inside cam follower 39 moves from G to H. Formation of this half loop involves a backward longitudinal motion imparted by inside follower 39 simultaneously with a transverse downstroke.

The loop of the letter a is completed as the outer cam follower moves from H to I and the inner cam follower from H to I. The finishing downstroke of the a is formed as the outer cam follower 34 moves from I to K and the inner follower 39 from I to K and the letter a is finished with an upstroke as follower 34 moves from I to L and follower 39 from K to L. The stylus is returned to starting position by means of a backward longitudinal movement imparted as follower 34 is moved from L back to A relative to the cam disk and follower 39 is moved from L back to D.

As the stylus is returned to its starting position, it is desirably lifted from the surface of the pad. This is accomplished by the following means: An opening 50 is provided in the front wall 11 of the housing 10. A cam 51 is keyed to horizontal shaft 43 for rotation with the shaft and the gear wheel 45. A curved arm 52 is secured at one end to carrier arm 24 adjacent to where it is journaled for pivotal movement in the

end members

22 and 23 of the longitudinal motion carrier 20. The arm 52 extends outwardly over the transverse motion carrier and the cam mechanism and curves downwardly through the opening 50 in front wall 11 and into the path of cam 51.

The carrier arm 24 is maintained under constant spring tension in order to insure contact between the stylus 25 and the surface of pad 28 during the scribing of a word or figure. Tension is maintained by a flat spiral spring 53 one end of which is secured to the end of carrier arm 24 and the other end of which is supported by a bar 54 extending across the top of the longitudinal motion carrier 20. The cam 51 is so positioned on shaft 43 that at the end of the inscription the cam engages arm 52 and moves it upwardly against the tension of spring 53 to lift the carrier arm and the stylus during the backward return stroke. In the exemplary illustration, as the cam 29 moves through the distance represented by the segment from L to A, the arm 52 is engaged by cam 50 and the stylus is lifted off the pad.

In FIGURE 5 there is shown the motion conversion unit of this invention installed in the body and arms of a doll indicated generally at 55. The housing 10 is installed in the upper chest portion of the dolls body. Carrier arm 24 extends out through the right shoulder and down through the right arm to the right hand of the doll which holds a suitable stylus. Similarly, the stationary arm 27 extends through the left shoulder and the left arm of the doll down to the left hand which holds a suitable pad 23. Obviously the mechanism can be reversed to produce a left-handed doll if so desired.

In the exemplary illustration the mechanism of this invention is designed to inscribe the word Ma. By merely substituting another double track cam wherein the outer track and inner track have different configuralions, other short words and simple designs and figures may be inscribed by a stylus. The stylus may be, for example, a pencil, a ballpoint pen, or the like and the pad 28 may be simply a pad of paper supported by a suitable rigid backing. In the preferred embodiment of the invention, however, it is preferred that the stylus be simply a dull, non-marking point and that the pad be a so-called Magic Slate.

As is well known, such a tablet or pad comprises an opaque backing sheet having a waxy coating overlaid by semi-opaque or translucent sheet. This last sheet may also desirably be covered by a transparent film. As an inscription is formed by the pressure of the stylus against the top surface of the pad, the semi-opaque sheet is forced into intimate contact with the waxy surface of the opaque backing. Because of the very slight tackiness of the waxy coating the semi-opaque sheet adheres to the opaque backing along the line where pressure was applied so that the opaque backing is visible through the semi-opaque sheet at those points. The whole inscription is erased by merely lifting the translucent sheet from the backing and breaking the temporary bond between it and the backing sheet.

It will be apparent that a variety of types of rotary motion means may be employed to impart rotary motion to the double track cam 29 and the invention is by no means limited to the crank and gear wheel system shown. Other exemplary means include spring motors and the like.

Referring to FIGURE 6, there is shown a modified form of motion conversion device incorporating alternative structure for lifting the stylus from the surface of the pad after a word has been written on the pad. According to the alternative structure, an arm 52A is secured at one end to carrier arm 24 in such a position that arm 52A lies over a radius of the cam disk. The arm 52A is inclined downwardly at such an angle that when the stylus 25 is in contact with the pad 28, the arm 52A is supported just free of the peripheral edge of the cam disc. An arcuate edge cam 56 extends upwardly from the top surface of the cam disk adjacent its peripheral edge. The edge cam 56 has a profile and is of such height, as best shown in FIGURE 7, that upon completion of the word written on the pad the free end of arm 52A is contacted by the edge cam 56 rotating with the cam disk, and arm 52A is lifted causing pivotal rotation of carrier arm 24 in the

end members

22 and 23 of the longitudinal motion carrier 20 lifting the stylus from the pad. Upon continued rotation of the cam disk, the action of arm 52A riding on edge cam 56 again lowers the carrier arm bringing the stylus into contact with the pad.

Spring 53 which maintains the carrier arm under spring tension to insure contact between the stylus and the pad during the scribing of a word or figure likewise insures contact between the end of arm 52A and the edge cam. Use of the alternative arm lifting means requires relocation of cam follower 34 and its associated structure, including bracket 35 and connecting arm 37, so that the displacement between the inside cam follower 39 and outside cam follower 34 is 270, or 90 in the opposite direction. This likewise necessitates similar displacement of the cam tracks on the cam disk. By reference to the explanation in connection with FIGURE 4, it will be seen that displacement of the cam tracks can be readily accomplished.

In the scribing of certain words containing the letter i which needs to be dotted, or t" which needs to be crossed, or where two words or two block letters are required to be separated, it is necessary to provide means for lifting the carrier arm 24 so that this separation may be accomplished. For example, in scribing a word containing a t, the entire word may be written without crossing the "t; the arm is then lifted and the point of the stylus is returned to proper position for beginning a cross line and then returned to the pad. When the cross stroke has been scribed, the stylus is again lifted from the pad denoting the end of the word. Secondary arcuate edge cams 57 may be provided as needed about the periphery of the cam disk to lift the carrier arm as required.

In FIGURES 8 and 9 there is shown an alternative form of cam disk and cam follower. The alternative form of cam disk 29A utilizes raised

tracks

58 and 59 which are in the form of ridges or lands, as opposed to grooves. The cam followers for use with the alternative form of ridge cam each include a pair of Vertical rollers 60, each supported vertically from a slotted base 61 adapted to be supported in and slidably movable in

brackets

35 and 41 in much the same manner as the pin cam followers. Rollers 60 are journaled for rotation on oposite side of one of the

ridge cams

58 or 59. A connecting spur or lug 62 on the top of the base member 61 permits operative connection of the cam followers to the carrier elements. The alternative form of cam construction may be utilized in conjunction with the motion conversion device as shown in FIGURES 1 to 3 or the modified form shown in FIGURE 6. Where utilized in the modified form of structure shown in FIGURE 6, edge cams are provided as needed.

It is apparent that many modifications and variations of this invention as hereinbefore set forth may be made without departing from the spirit and scope thereof. The specific embodiments described are given by way of example only and the invention is limited only by the terms of the appended claims.

I claim:

1. A device for converting rotary motion to transverse and longitudinal motion in a plane, said device comprising a supporting frame, a transverse motion carrier mounted for reciprocatory motion in said frame, a longitudinal motion carrier mounted on said transverse carrier for transverse movement with said carrier and longitudinal motion relative thereto, a double track disk cam, a cam follower disposed in association wtih each of said cam tracks, a slotted guide member for each of said cam followers, said slotted guide members being secured to said frame and spaced from the face of said disk cam, the slots in said guide members being disposed at right angles with respect to each other, means connecting one of said cam followers to said transverse motion carrier to impart transverse motion to said carrier, means connecting the other of said cam followers to said longitudinal motion carrier to impart longitudinal motion thereto, and means for rotating said cam.

2.. A device according to claim 1 further characterized in that said transverse motion carrier comprises a pair of spaced parallel horizontal slide members mounted at each end in the supporting frame for reciprocation in a transverse direction.

3. A device according to claim 2 further characterized in that said transverse motion carrier includes a second pair of spaced parallel horizontal slide members perpendicular to the first pair of slide members and connected thereto.

4. A device according to claim 3 further characterized in that said longitudinal motion carrier is supported on said second pair of slide members.

5. A device according to claim 3 further characterized in that the guide member slot for the cam follower connected to the transverse motion carrier is parallel to said first pair of slide members.

6. A device according to claim 5 further characterized in that the means connecting the other of said cam followers to said longitudinal motion carrier comprises a slot in the bottom of said carrier parallel to said first pair of slide members.

7. A device according to claim 1 further characterized in that said cam disk is provided with a pair of non-intersecting eccentric cam tracks disposed about the center 7 of said disk;;the inner track governing longitudinal movement of the longitudinal motion carrier and the outer track governing transverse movement of the transverse motion carrier and longitudinal motion carrier.

8. A device according to claim 1 further characterized in that a rigid carrier arm having a stylus at its outer extremity is mounted for movement with said longitudinal motion' carrier, a rigid stationary arm is mounted on said supporting frame, said stationary arm having a flat pad at its outer extremity held in the plane of movement of said stylus.

9. A device according to claim 8 further characterized in that said means for rotating said cam includes a first horizontal gear wheel supported for rotation with said cam, a horizontal shaft journaled in said supporting frame below said first gear wheel, a second vertical gear wheel on said shaft having; teeth meshing with the first gear wheel and means for rotating said shaft.

10. A device according to claim 8 further characterized by the provision of cam means operative to lift said carrier arm and stylus from the surface of said pad.

11. A device for converting rotary motion to transverse and longitudinal motion in a plane, said device comprising a supporting frame; a transverse-motion carrier comprising-a pair of parallel horizontal slide members mounted in said frame for reciprocation in a transverse direction and a second pair of parallel horizontal slide members perpendicular to the first pair of slide members .andconnectedthereto; a longitudinal motion car-, rier mounted on said second pair ofslide members of said transverse carrier for transverse movement with said carrier and longitudinal motion'relative thereto; a hori zontal double-track carndisk supported for horizontal rotationin said frame below said carriers, saidcam being providedlwith a pair of-non-intersecting eccentric cam tracks disposed about the center of said disk, the inner track governing longitudinal movement of the longitudinal motion carrier and the outer track governing transverse movement of the transverse motion carrier and longitudinal motion carrier; a cam follower adapted to follow said outer'cam track, a slotted guide member for said cam follower secured to said frame above the cam disk, the slot of said guide being parallel to the first pair of horizontal slide members of said transverse motion carrier, means connecting said cam follower to said transverse motion carrier whereby transverse motion of said cam follower upon rotation of said cam is imparted to said carrier; a second cam follower adapted to follow said inner cam track, a second slotted guide member for said second cam follower secured to said frame above the cam disk, the slot of said guide being disposed at right angles to said first guide slot, means connecting said second cam follower to said longitudinal motion carrier whereby longitudinal motion of said cam follower upon rotation of said cam is imparted to said carrier; a rigid carrier arm having a stylus at its outer extremity mounted for movement with said longitudinal motion carrier; a rigid stationary arm mounted on said supporting frame, said arm having a flat pad at its outer extremity held in the plane of movement of the stylus; and means for rotating said cam.

12. A device according to claim 11 further characterized by the provision of cam means operative to lift said carrier arm and stylus from the surface of said pad.

References Cited in the file of this patent UNITED STATES PATENTS 4,271 Thurber Nov. 18, 1845 512,089 Bangerter Jan. 2, 1894 1,652,988 Sundquist Dec. 13, 1927 1,883,204- Whitaker Oct. 18, 1932