US3299730A

US3299730A - Rotary drive apparatus for rewind mechanisms

Info

Publication number: US3299730A
Application number: US376706A
Authority: US
Inventors: Sr Arthur Barsam; Jr Arthur Barsam
Original assignee: CINEX Inc
Current assignee: CINEX Inc
Priority date: 1964-06-22
Filing date: 1964-06-22
Publication date: 1967-01-24
Anticipated expiration: 1984-01-24

Description

Jan. 24, 1967 A. BARSAM, SR, ETA). 3,299,730

ROTARY DRIVE APPARATUS FOR REWIND MECHANISMS Filed June 22, 1964 2 Sheets-Sheet 1 'INVENTORS ARTHUR BARSAMSA, ARTHUR BARSAM, Jfl,

BUM,%, 1% j ATTORNEYS,

Jan. 24, 1967 A. BARSAM, sR.. ET AL 3,299,730

ROTARY DRIVE APPARATUS FOR REWIND MECHANISMS Filed June 22, 1964 2 Sheets-Sheet 2 I NVENTORS. ARTHUR BARsAMfl.

ARTHUR BARSAMJR,

am, Fuzz, @Aa

ATTORNEKS. 7

United States PatentOfiice Patented Jan. 24, 1967 3,299,730 ROTARY DRIVE APPARATUS FOR REWINI) MECHANISMS Arthur Barsam, Sr., and Arthur Barsam, In, Los Angeles,

Calif, assignors to Cinex Inc., a corporation of California Filed June 22, 1964, Ser. No. 376,706 14 Claims. (Cl. 74-421) The present invention relates to an improved rewind mechanism for winding motion picture film, sound track film, tapes and other ribbon-like materials from one reel to another, and, more specifically, to a novel rotary drive particularly useful in rewind mechanisms.

Although many technical improvements have been made in the handling and processing of movie film, handoperated film rewinds have not changed in principle since the early days of silent films. They still comprise a relatively large driver gear and a small pinion gear journaled in an upright housing or frame. The drive gear is fixedly coupled to rotate with a drive shaft while the pinion gear is coupled to a spindle-supporting shaft for receiving a film reel. The turning of the reel is controlled by a hand-operated crank on the drive shaft.

In the winding and rewinding of film, the rewinds are generally utilized in pairs. The rewinds are secured to the top of a suitable work surface a few feet apart with a film-loaded reel mounted on one rewind and an empty reel secured to the other. The end of the film of a loaded reel is coupled to the empty reel. Then, by turning the hand crank of the empty rewind, the film is transferred from the full to the empty reel. In this operation, it is the film which exerts a pulling or rotational driving force on the film-loaded reel. It is, therefore desired that the necessary driving force be of a minimum value. To this end, conventional rewinds provide means for axially moving the drive shaft with respect to the reel shaft to separate the drive gear from the pinion gear of the film-loaded rewind. This allows the reels to rotate freely and rapidly with a minimum of strain on the film and the operator.

If film is simply being transferred from one reel to another, conventional rewinds provide reasonably satisfactory operation. However, in film-editing, it is necessary to often selectively stop and reverse the direction of film travel. With conventional rewinds this presents several basic problems. Before the direction of film travel can be reversed, the reels must be fully stopped. Otherwise, it is impossible to re-engage the drive and pinion gears without clashing and grinding the gears. If the reels are free-wheeling, separate braking means must be employed to stop the reels. Even after the reels are stationary, the operator must very carefully slide the drive gear into engagement with the pinion gear if excessive wear is to be avoided. This takes time and requires the operator to exercise a degree of patience which in practice is often forgotten in lieu of increased speed of film editing. The result, of course, is an undesired wearing of the drive and pinion gears which if repeated during periodic stop, start, and reverse operation of the film rewind materially shortens the useful life of the gears.

With the foregoing problems in mind, it is an object of the present invention to provide a rewind wherein the rotational drive coupling between the drive shaft and the pinion gear may be selectively and rapidly modified without clashing, grinding, or otherwise wearing the gears of the rewind.

It is another object of the present invention to provide a rewind wherein the rotational drive coupling between the drive shaft and the pinion gear may be selectively modified without axially moving the drive shaft, drive gear, or 'hand crank of the rewind.

A further object of the present invention is to provide a rewind wherein the rotation drive coupling between the drive shaft and the pinion gear may be modified While the gears of the rewind are rotating without any wearing of the gears.

A still further object of the present invention is to provide a rewind of the foregoing type wherein the apparatus for selectively modifying the rotational drive coupling of the drive shaft of the pinion gear is capable of selectively stopping and starting rotation of the gears of the rewind as desired thereby eliminating the need for separate braking means.

The foregoing as well as other objects and advantages of the present invention will be more clearly understood by reference to the following detailed description when considered with the drawings in which:

FIGURE 1 is a side view of one form of the rewind of the present invention;

FIGURE 2 is a sectional side view of the rotational drive apparatus of the rewind illustrated in FIGURE 1;

FIGURE 3 is a front view of the rotational drive assembly along the line 3-3 in FIGURE 1; and

FIGURE 4 is a sectional view of a slightly modified rotational drive assembly for the rewind of FIGURE 1.

In the drawings, the rewind is represented generally by the numeral 8 and includes an upright housing and supporting frame 10 having a vertically extending main body portion 12 and opposing outwardly flanged base sections or feet 14. The base sections 14 extend laterally from the main body portion 12 and including openings 16 for receiving bolts to secure the rewind to a suitable work surface. As illustrated, intermediate and

upper side portions

18, 20 and 24, 26 of the housing 10 extend outwardly from the main body portion 12 and act as collars to provide support for the journal members of a drive or crank shaft 22.

The spindle-supporting shaft 28 is hollow and receives the shank 30 of a reel-receiving spindle 32. The spindle 32 supports a reel-spacing collar 34 and a reel-driving key 36. Preferably, the spindle-supporting assembly is of the type described in US. Patent No. 2,939,643, issued June 7, 1960, under the title, Removable Spindle Rewind Mechanism, and is arranged to release the spindle 32 from locking engagement'within the shaft 28 by a quarter turn of a knurled knob 38 disposed at an opposite end of the spindle-receiving shaft. 1

The shaft 28 also supports a pinion gear 39 (see FIG- URE 3). Thepinion gear 39 is fixed to the spindlesupporting shaft and makes driving engagement with a relatively large drive gear 40. The drive gear 40 is supported for rotation around the drive shaft 22 within the housing 10. Rotation of the drive gear 40 produces rotation of the pinion gear 39 and hence a similar rotation of the spindle-supporting shaft 28 to wind film, or the like, onto a reel (not shown) supported by the spindle 32.

The rotation of the spindle-supporting shaft 28 is selectively controlled by the rotary drive mechanism 44 of the present invention and a hand-operated crank 42 fastended to the exposed end of the drive shaft 22. The hand crank 42 includes a rotatable crank arm 46 having an outwardly extended handle 48 at one end and an enlarged section 50 at the other end of suflicient weight to counterbalance the handle 48. The crank arm 46 is pin fastened at 52 to the drive shaft 22. Accordingly, rotation of the hand crank produces a corresponding rotation of the drive shaft which, in turn, is selectively transmitted to the spindle-supporting shaft 28 by the rotary drive assembly 44.

In brief, the rotary drive assembly 44 includes the drive gear 40, a pair of externally threaded

sleeves

54 and 56, a pair of

drive discs

58 and 60 having internally threaded openings 62 and 64 engaging the threaded

sleeves

54 and 56, a pair of

stop members

66 and 68 for limiting relative movement between the drive gear 40 and the

drive discs

58 and 60, and a pair of drag or friction producing assemblies'70 and 72 for inhibiting rotary movement of the drive discs 58 andv 60.

The drive gear40 is mounted for free rotational movement around the drive shaft 22 bya ball bearing assembly 74 which includes a plurality of ball bearings 76 disposed between an inner race 78 and an outer race 80.

The inner race 78 is secured to and around the drive 1 shaft 22 while the outer race 80 is secured within a central opening 82 in the drive gear 40 around the inner race 78 by a pair of

flat retaining rings

84 and 86. The

rings

84 and 86 extend around and overlap opposing ends of the opening 82 as well as the sides of the outer race 80 and are coupled together by a plurality of screws 88, passing through the drive gear 40.

The externally threaded

sleeves

54 and 56 of the rotary drive assembly 44 extend around the drive shaft 22 on

opposite sides

90 and 92 respectively, of the drive gear 40 and are secured to the drive shaft by

pins

96 and 98. The threads 100 and 102 of the

sleeves

54 and 56 have a common pitch and when viewed from the right in FIGURE 2 screw in opposite directions toward the drive gear 40the thread 100 of the sleeve 54 screwing in a counterclockwise direction and the thread 102 of the sleeve 56 screwing in a clockwise direction.

As illustrated in FIGURE 2, the threaded

sleeves

54 and 56 receive and support the

drive discs

58 and 60, respectively, around the drive shaft 22. In particular, the

drive discs

58 and 60 include central internally threaded openings 62 and 64 which mate with the externally threaded

sleeves

54 and 56 respectively. Accordingly, the drive disc 58 extends radially from the drive shaft 22 adjacent the side 90 of the drive gear 40 while the drive disc 60 extends radially from the drive shaft adjacent the side 92 of the drive gear.

In accordance with the present invention, rotation of the

drive discs

58 and 60 is inhibited by the friction or

drag members

70 and 72 which continuously engage and make sliding friction contact with the edges of the

drive discs

58 and 60 respectively. As most clearly illustrated in FIGURE 2, the drag assembly 70 includes a block 104 of graphite or other suitable friction material seated within a slot 106 in the housing 10. The block 104 includes a concave upper surface 108 for contacting the periphery of the disc 58, and a pair of openings 110 and a lower surface for receiving coil springs 112. The coil springs extend vertically within the opening 110 and press against the bottom of the slot 106 to continuously urge the block 104 upwardly against the periphery of the drive disc 58. The block 104 thus continuously exerts a drag force on the drive disc 58 to retard rotary movement of the drive disc around the sleeve 54 and drive shaft 22.

The drag assembly 72 is similar to the drag assembly 70 and includes a block 104' having a concave upper surface 108 continuously urged against the periphery of the drive disc 60 by a pair of coil springs 112. Thus, rotation of the drive disc 60 about the sleeve 56 and the drive shaft 22 is continuously retarded by the block 104.

Since rotation of the

drive discs

58 and 60 is inhibited by the

drag assemblies

70 and 72, when the drive shaft 22 is initially rotated in a clockwise direction, the drive shaft 22 and the

sleeves

54 and 56 turn within the openings 62 and 64 in the

drive discs

58 and 60, respectively. The clockwise rotation of the sleeve 54 with the drive shaft screws the drive disc 58 axially along the drive shaft 22 toward the drive gear 40 to engage the side 90 thereof.

' At the same time, the clockwise turning of the sleeve 56 with the drive shaft 22 screws the drive disc 60 away from the drive gear 40. Similarly, when the drive shaft initially rotates in a counterclockwise direction, the sleeve 56 turns within the threaded opening 46 in the drive disc 60 to screw the drive disc 60 toward the drive gear 40 to engage the side 92 thereof while the counterclockwise turning of the sleeve 54 within the threaded opening 62 in the drive disc 58 screws the drive disc 58 away from the drive gear 40. Thus, with rotation of the drive shaft 22, one drive disc movesv to contact the drive gear 40 while.the other drive disc moves away from the drive gear.

When, for example, the drive disc 58 engages the side of the drive gear 40, contact plates 114 extending from the inner surface of the drive disc bear tightly against the drive gear and create a strong, frictional drive coupling between the drive gear 40 and the drive disc 58. Parenthetically, the contact plates 114 may take the form of cork pads or pads of other suitable materials secured within corresponding recesses 116 in the surfaces of the drive discs facing the drive gear by an adhesive extending through openings 118 leading to the recesses 116.

In any event, due to the strong friction coupling provided by the contact plates, after the drive disc 58 has moved toward and engaged the side 90 of the drive gear 40 in response to clockwise rotation of the drive shaft 22, further rotation of the drive shaft in the same direction exerts a clockwise rotational force on the drive disc 58 which easily overcomes the drag forces associated with the drag member 70. The drive disc 58 then rotates in a clockwise direction with the drive shaft 22 and carries the drive gear 40 in the same direction to impart rotary movement to the pinion gear and spindle shaft 28. It should be noted that while the drive disc 58 is rotating the drive gear 40 in a clockwise direction, the drive disc 60 is slightly separated from the drive gear. i

A corresponding, yet opposite operation takes place when the drive disc 60 has moved toward and engaged the side 92 of the drive gear 40 in response to counterclockwise rotation of the drive shaft 22. In that case, further rotation in the counterclockwise direction exerts a counterclockwise rotational force on the drive disc 60 which easily overcomes the drag forces exerted by the drag assembly 72 on the drive disc. The drive disc 60 then rotates in a counterclockwise direction and carries the drive gear 40 in a counterclockwise direction to impart rotary movement to the pinion gear and spindle shaft 28. While the drive disc 60 is rotating the drive gear 40 in a counterclockwise direction, the drive disc 58 is separated slightly from the drive gear 40.

As previously indicated, relative movement between the

drive discs

58 and 60 and the drive gear 40 is limited by the

stop members

66 and 68. In particular, the

stop members

66 and 68 limit the maximum displacement of the drive discs from the drive gear 40 and prevent the drive disc from screwing off the threaded portions of the associated

sleeves

54 and 56.

To this end, the stop member 66 includes a collar portion 120 fixed to the outer end surface of the sleeve 54 and an arm portion 122 extending radially from the col lar portion 120. Thus, the stop member 66 is secured for rotation with the sleeve 54 and drive shaft 22. The arm 122 lies adjacent the outer radial surface of the drive disc 58 and at its outer end supports a pin member 126 which extends into one of a plurality of angularly spaced arc-shaped slots 128 in the drive disc 58. The stop member 66 is angularly disposed around the sleeve 54 relative to the slot 128 such that the pin 126 (l) is adjacent an end 129 of the slot when the drive disc 58 engages the side 90 of the drive gear 40 to drive the gear in a clockwise direction, (2) travels along the slot in a counterclockwise direction as the drive disc 58 is screwed away from the drive gear 40, and (3) engages the opposite end 130 of the slot when the drive disc is completely separated from the drive gear and disposed along the sleeve 54 at the end of the thread 100. Continued counterclockwise rotation of the drive shaft 22, sleeve 54, and stop member 66, then produces a like rotation of the drive disc 58 as the pin 126 presses against end 130 of the slot 128. Continued counterclockwise rotation of the drive shaft 22, etc., also produces a like rotation of the drive gear 40 since when the pin 126 engages the end 130 of the slot 128, the drive disc 60 tightly engages the side 92 of the drive gear.

A similar arrangement exists for the stop member 68 which includes a collar portion 120' fixed to the outer end surface of the sleeve 56 and an arm portion 122' extend ing radially from the collar portion. Thus, the stop member 68 is secured for rotation with the sleeve 56 and the drive shaft 22. The arm 122' lies adjacent the outer radial surface of the drive disc 60 and at its outer end supports a pin member 126' which extends into one of a plurality of angularly spaced, arc-shaped slots 128' in the drive disc 60.

Similar to the stop member 66, the stop member 68 is angularly disposed around the sleeve 56 relative to'the slot 128 such that the pin 126' (l) is adjacent one end of the slot when the drive disc 60 engages the side 92 of the drive gear 40 to drive the gear in a counterclockwise direction, (2) travels along the slot 128' in a clockwise direction as the drive disc 60 is screwed away from the drive gear 40, and (3) engages an opposite end of the slot 128 when the drive disc is completely separated from the drive gear and disposed along the sleeve 56 at the end of the thread 102. Continued clockwise rotation of the drive shaft 22, and the sleeve 56, and stop member 68, then produces a like rotation of the drive disc 60 as the pin 126' presses against the end of the slot 128. Continued clockwise rotation of the drive shaft 22, etc., also produces a like rotation of the drive gear 40 since when the pin 126' engages the end of the slot 128, the drive disc 58 tightly engages the side 90 of the drive gear.

By way of summary and review, and starting with both drive

discs

58 and 60 separated slightly from the drive gear 40, and the drive shaft 22 stationary, when it is desired to impart clockwise rotational movement to the drive gear and hence counterclockwise rotational movement to a reel supported by the reel supporting shaft 28, the hand crank 46 is rotated in a clockwise direction. Initially, the

drive discs

58 and 60 are prevented from rotating by the

drag members

70 and 72, respectively. Therefore, the initial rotation of the drive shaft 22 produces a clockwise rotation of the threaded

sleeves

54 and 56 within the threaded openings in the

drive discs

58 and 60. The clockwise rotation of the sleeve 54 causes the drive disc 58 to move toward and tightly engage the side 90 of the drive gear 40 while the clockwise rotation of the sleeve 56 causes the drive disc 60 to move away from the side 92 of the drive gear. When the drive disc 58 tightly engages the side 90 of the drivegear 40, the pin 126' contacts the end of the slot 128 in the drive disc 60. Continued clockwise rotation of the drive shaft 22 then produces a clockwise rotation of the drive disc 58 with the drive shaft 22 and a similar rotation of the drive gear 40 and the drive disc 60.

When rotary movement of the drive shaft 22 is halted by stopping rotation of the hand crank 42, the drive disc 58 continues to turn for an instant of time relative to the drive shaft 22. This causes the drive disc 58 to back off slightly from the side 90 of the drive gear 40. Rotation of the drive disc 58 is then immediately halted by the friction contact between the drag member 70 and the edge of the drive disc. Similarly, rotation of the drive disc 60 is immediately halted by the drag member 72. Both drive

discs

58 and 60 as well as the drive shaft 22 then remain stationary as the drive gear 40 continues to freely rotate about the drive shaft to drive the spindlesupporting shaft 28 and the reel coupled thereto.

If it is desired to further increase the angular velocity of the reel or if, after a period of free-wheeling and slow down, it is desired to again bring the reel up to speed, the hand crank 42 is simply rotated again in a 6 clockwise direction to move the drive disc 58 into driving engagement with the drive gear 40. Continued clockwise rotation of the hand crank 42 then imparts further clockwise driving movement to the drive gear 40 through the drive disc 58 as previously-described.

If it is desired to halt clockwise rotation of the drive gear 40, the clockwise rotation of the hand crank 42 is reversed. This produces an immediate reversal in the direction of rotation of the drive shaft 22 carrying the threaded

sleeves

54, 56. The threaded

sleeves

54 and 56 thus rapidly turn in a counterclockwise direction relative to the clockwise

rotating drive discs

58 and 60. This produces a rapid separation of the drive disc 58 from the side of the drive gear 40 and an immediate halting of rotation of the drive disc by

drag members

70 and 72. Continued counterclockwise rotation of the hand crank 42 and drive shaft 22 produces counterclockwise travel of the threaded

sleeves

56 and 54 within the

stationary drive discs

60 and 58, respectively. This causes the drive disc 60 to move toward and tightly engage the side 92 of the drive gear 40 and the drive disc 58 to move further away from the side 90 of the drive gear until the pin 126 engages the end 130 of the slot 128. The pressure of the drive disc 60 against the moving side 92 of the drive gear 40 produces a rapid stopping of the drive gear. Continued counterclockwise rotation of the drive shaft 22 and drive disc 60 then causes the drive gear 40 to rotate in a counterclockwise direction driving the pinion gear and spindle-supporting shaft in a clockwise direction.

As before,to disengage the drive shaft 22 and drive

discs

58 and 60, the rotation of the hand crank 42 is stopped. The drive disc 68 then moves away from the side 92 of the drive gear 40 and rotation thereof is arrested by the drag member 72. -The drive gear 40, however, continues to rotate in a counterclockwise direction without the stationary drive shaft 22 until such time as it is desired to stop rotation of the drive gear 40.

From the foregoing it will be appreciated that a rotary drive assembly of the present invention provides means for selectively and rapidly modifying the rotational drive coupling between the drive shaft 22 and the pinion gear and spindle-supporting shaft of the rewind 8 without any clashing, grinding or other wearing of the gears of the rewind. Further, the rotary drive assembly provides for selective modification of the rotational drive coupling between the drive shaft and the pinion gear without requiring any axial movement of the drive shaft, drive gear or hand crank of the rewind. Moreover, the rotational drive coupling between the drive shaft and pinion gears of the rewind may be modified while the gears of the rewind are rotating. In addition, the rotary drive assembly of the present invention provides for self-braking and stopping of the gears ofthe rewind without clashing or grinding of the gears and without requiring a separate braking means.

In the foregoing, a specific embodiment of the present invention has been described in detail. Of course, variousmodifications may be made in the specific structure without'departing from the spirit or scope of the present invention. As one example, the

drag members

70 and 72 may be modified to the form illustrated in FIGURE 4 as 70 and 72'.

As represented, the drag assembly 70' includes a plurality of angularly spaced blocks 132 disposed within cup-shaped extensions 134 from the inner wall of the housing 10. The cup-shaped extensions 134 are radially spaced around the drive shaft 22 and provide sliding support for the cylindrical blocks 132. The blocks 132 are continuously urged outward to engage the outer surface of the drive disc 58 by a plurality of coil springs 136, one stationed within each of the cup-shaped extensions 134. The blocks 132 exert a sufiicient friction force against the drive disc 58 to maintain the drive disc stationary about the drive shaft 22 while a drive disc is moving axially along the shaft toward and away from the drive gear 40 between engagement with the drive gear and the point at which the pin 126 engages the end 130 of a slot 128 in the drive disc. As previously described, when the drive disc 58 engages the drive gear 40, continued rotation of the drive shaft overcomes the friction developed by the blocks 132 on the side of the drive disc 58 to produce a rotation of the drive disc and hence the drive gear 40. However, as soon as the drive shaftrztl stops, the friction developed by the blocks 132 arrests the rotary movement of the drive disc 58.

A similar arrangement exists for the drag assembly 72 which includes a plurality of blocks 132 stationed Within a plurality of cup-shaped extensions 134' etxending from the left-hand wall of the housing 10. Coil springs 136 within the cup-shaped extensions 134' continuously urge the blocks against the drive disc 60 to prevent rotation of the drive disc 60 about the drive shaft 22 while the drive disc is moving axially along the drive shaft between contact with the drive gear 40 and the point at which the pin 126 engages the end of the slot 128' in the drive disc.

Accordingly, the modified rotary drive illustrated in FIGURE 4 functions in the same manner as the previously described embodiment to selectively impart and control the rotary movement of the drive gear 40.

We claim:

1. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a driven member supported by said shaft for substantially free rotational movement about said shaft;

a drive member supported by said shaft adjacent said driven member;

cooperative means on said shaft and said drive member for moving said drive member along said shaft to engage said driven member in response to rotary movement of said shaft in one direction and for moving said drive member away from said driven member in response to rotary movement of said shaft in an opposite direction such that rotary movement in said one direction is imparted to said drive member and hence to said driven member when said drive member engages said driven member;

and means for inhibiting rotary movement of said drive member relative to said shaft when said drive member turns in said opposite direction and when said drive member moves away from said driven member.

2. The combination of claim 1 wherein said means for inhibiting rotary movement of said drive member includes friction producing means continuously engaging said drive member.

3. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a driven member supported by said drive shaft for substantially free rotary movement around said shaft;

a first drive member supported by said shaft adjacent one side of said driven member;

7 a second drive member supported by said drive shaft adjacent an opposite side of said driven member; first cooperative means on said shaft and first drive member for moving said first drive member along said shaft to engage said one side of said driven member, in response to rotary movement of said shaft in one direction and for moving said first drive member away from said driven member in response to rotary movement of said shaft in an opposite direction such that rotary movement in said one direction is imparted to said first drive member and hence to said driven member when said first drive member engages said driven member;

and second cooperative means on said shaft and said second drive member for moving said second drive member along said shaft to engage said opposite side of said driven member in response to rotary movement of said shaft in said opposite direction and for moving said second drive member away from said driven member in response to rotary movement of said shaft in said one direction such that rotary movement in said opposite direction is imparted to said second drive member and hence to said driven member when said second drive member engages said driven member.

10 4. The rotary drive mechanism of claim 3 including means coupled to said shaft for limiting movement of said first and second drive members away from said driven member.

5. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a first drive member supported by said shaft adjacent one side of said driven member and including a slot I radially spaced from said drive shaft;

a second drive member supported by said drive shaft adjacent an opposite side of said driven member and including a slot radially spaced from said drive shaft;

finger supporting means extending from said drive shaft into said slots in said first and second drive members for limiting relative rotary movement between said shaft and said first and second drive members;

first cooperative means on said drive shaft and said first drive member for moving said first drive member along said drive shaft to engage said one side of said driven member in response to rotary movement of said drive shaft in one direction and for moving said first drive member away from said driven member in response to rotary movement of said drive shaft in an opposite direction such that rotary movement in said one direction is imparted to said first drive member and hence to said driven member when said first drive member engages said driven member;

and second cooperative means on said drive shaft and said second drive member for moving said second drive member along said drive shaft to engagesaid opposite side of said driven member in response to rotary movement of said drive shaft in said opposite direction and for moving said second drive member away from said driven member in response to rotary movement of said drive shaft in said one direction such that rotary movement in said opposite direction is imparted to said second drive member and hence to said driven member when said second drive member engages said driven member.

6. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a first drive member supported by said shaft adjacent one side of said driven member; I

a second drive member supported by said drive shaft adjacent an opposite side of said driven member;

first cooperative means on said shaft and first drive member for moving said first drive member along said shaft to engage said one side of said driven member in response to rotary movement of said shaft in one direction and for moving said first drive member away from said driven member in response to rotary movement of said shaft in an opposite direction such that rotary movement in said one direction is imparted to said first drive member and hence to said driven member when said first drive member engages said driven member;

second cooperative means on said shaft and said second drive member for moving said second drive member along said shaft to engage said opposite side of said driven member in response to [rotary movement of said shaft in said opposite direction and for moving said second drive member away from said driven member in response to rotary movement of said shaft in said one direction such that rotary movement in said opposite direction is imparted to said second drive member and hence to said driven member when said second drive member engages said driven member;

and means for inhibiting rotary movement of said first and second drive members when said drive shaft turns in said opposite and in said first directions, respectively, relative to said driven member and when said drive members move away from said driven member.

7. The rotary drive mechanism of claim 6 including a housing for supporting said drive shaft for rotary movement about its longitudinal axis and wherein said first and second drive members are disc-shaped and said means for inhibiting rotary movement of said first and second drive members each include a drag member having a concave surface for engaging the periphery of a disc-shaped drive member and spring means extending between said drag member and said housing for continuously urging said drag member against said disc-shaped drive member.

8. The rotary drive mechanism of claim 6 including a housing for supporting said drive shaft for rotation about its longitudinal axis and wherein said means for inhibiting rotary movement of said first and second drive members each include a drag member having a substantially fiat surface for contacting the side of a drive member remote from said driven member and spring means extending be tween said drag member and said housing for continuously urging said drag member against said drive member.

9. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a first screw means around said shaft adjacent one side of'said driven member;

a first drive member having a threaded opening mating with said first screw means for movement along said shaft to engage and disengage said side of said driven member with rotation of said shaft within said threaded opening in first and second directions, respectively, such that said first drive member and said driven member rotate in said first direction when said first drive member engages said driven member;

a second screw means around .said shaft adjacent an opposite side of said driven member;

a second drive member having a threaded opening mating with said second screw means for movement along said shaft to engage and disengage said opposite side of said driven member with rotation of said shaft within said opening in said second drive member in said second and said first directions respectively, such that said second drive member and said driven member rotate in said second direction when said second drive member engages said driven member;

and means for inhibiting rotary movement of said first and second drive members relative to said drive shaft as said drive shaft turns in said second and first directions, respectively, relative to said driven member thereby causing said first and second screw means to drive said first and second drive members axially along said drive shaft away from said driven member.

10. The rotary drive mechanism of claim 9 including means for limiting movement of said first and second drive members away from said driven member.

11. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a screw means around said shaft adjacent one side of said driven member;

a drive member having a threaded opening mating with said screw means for movement :along said shaft to engage and disengage said side of said driven member with rotation of said shaft within said threaded opening in first and second directions, respectively, such that said drive and driven members rotate in said first direction when said drive member engagessaid driven member;

and means for inhibiting rotation of said drive member relative to said drive shaft as said drive shaft turns in said second direction relative to said driven member thereby causing said screw means to drive said drive member axially along said drive shaft away from said driven member.

12. In a rewind, a rotary drive mechanism, comprising:

a drive shaft mounted for rotation about its longitudinal axis;

a first screw means around said shaft adjacent one side of said driven member;

a first drive member having a threaded opening mating with said first screw means for movement along said shaft to engage and disengage said side of said driven member with rotation of said shaft within said threaded opening in first :and second directions, respectively, such that said first drive member and said driven member rotate in said first direction when said first drive member engages said driven member;

a second screw means around said shaft adjacent an opposite side of said driven member;

and a second drive member having a threaded opening mating with said second screw means for movement along said shaft to engage and disengage said opposite side of said driven member with rotation of said shaft within said opening in said second drive member in said second and said first directions respectively, such that said second drive member and said driven member rotate in said second direction when Isjaid second drive member engages said driven memer.

13. A rewind mechanism, comprising:

a housing;

a drive shaft supported by said housing for rotary movement about its longitudinal axis;

a hand crank coupled to said drive shaft for rotating said drive shaft;

a driven shaft supported by said housing in a plane substantially parallel to said drive shaft :for rotary movement about its longitudinal axis, said driven shaft being adapted to support a reel;

a drive gear supported by said drive shaft for substantially free rotary movement around said drive shaft;

a driven gear coupled for rotation with said driven shaft, said driven [gear mating with said drive gear such that rotation of said drive gear rotates said driven gear and driven shaft;

a first drive member supported by said shaft adjacent one side of said drive gear;

a second drive member supported by said drive shaft adjacent an opposite side of said drive gear;

first cooperative means on said drive shaft and said first drive means for moving said first drive member along said drive shaft to engage said one side of said drive gear in response to rotary movement of said hand crank and drive shaft in one direction and for moving said first drive mernber away from said drive gear in response to rotary movement of said hand crank and drive shaft in an opposite direction such that rotary movement in said one direction is imparted to said drive gear when said first drive member engages said drive gear;

second cooperative means on said drive shaft for moving said second drive member along said drive shaft to engage said opposite side of said drive gear in response to rotary movement of said drive shaft in said opposite direction and for moving said second drive member away from said drive gear in response to rotary movement of said drive shaft in said one direction such that rotary movement in said opposite direction is imparted to said drive gear when said second drive member engages said drive gear;

friction means supported by said housing for inhibiting rotation of said first and second drive members;

and means supported by said drive shaft for limiting movement of said first and second drive members away from said drive gear.

14. A rewind mechanism, comprising:

a housing;

a hand crank coupled to said drive shaft for rotating said drive shaft;

a driven shaft supported 'by said housing in a plane substantially parallel to said drive shaft for rotary movement about its longitudinal axis, said driven shaft being adapted to support a reel;

a drive gear supported :by said drive shaft for substantially free rotary movement around said drive shaft;

a driven gear coupled for rotation with said driven shaft, said driven gear mating with said drive gear such that rotation of said drive gear rotates said driven gear and driven shaft;

a first screw means around said drive shaft adjacent one side of said drive gear;

a second screw mean-s around said drive shaft adjacent an opposite side of said drive gear;

a first drive disc having a threaded opening mating with said first screw means for movement along said drive shaft to engage and disengage said side of said drive gear with rotation of said drive shaft within said threaded opening in first and second directions, respectively, such that said first drive disc and drive shaft rotate in said first direction when said first drive disc engages said drive gear;

a second drive disc having a threaded opening mating with said second screw means for movement along said drive shaft to engage and disengage said opposite side of said drive gear with rotation of said drive shaft within said opening in said second drive disc in said second and said first directions, respectively, such that said second drive disc and said drive gear rotate in said second direction when said second drive disc engages said drive gear;

friction means supported by said housing for inhibiting rotation of said first and second drive discs;

and means supported by said drive shaft for limiting movement of said first and second drive disc's away from said drive gear.

References Cited by the Examiner UNITED STATES PATENTS 824,805 7/ 1906 Muller 19294 X 860,590 7/ 1907 Williams 19294 X 1,254,180 1/1918 Ward '19-2-43 1,833,648 11/1931 Johnson 74-421 X 1,899,660 2/1933 Becker 192-19 2,507,640 5/ 195 0 Macdonald 74-337 X 2,699,854 1/1955 Trout 19231 X 3,158,244 11/196'4 L-anigan et a1 192-94 X DAVID J. WILLIAMOWSKY, Primary Examiner.

L. H. GERIN, Assistant Examiner.

Claims

13. A REWIND MECHANISM, COMPRISING: A HOUSING; A DRIVE SHAFT SUPPORTED BY SAID HOUSING FOR ROTARY MOVEMENT ABOUT ITS LONGITUDINAL AXIS; A HAND CRANK COUPLED TO SAID DRIVE SHAFT FOR ROTATING SAID DRIVE SHAFT; A DRIVEN SHAFT SUPPORTED BY SAID HOUSING IN A PLANE SUBSTANTIALLY PARALLEL TO SAID DRIVE SHAFT FOR ROTARY MOVEMENT ABOUT ITS LONGITUDINAL AXIS, SAID DRIVEN SHAFT BEING ADAPTED TO SUPPORT A REEL; A DRIVE GEAR SUPPORTED BY SAID DRIVE SHAFT FOR SUBSTANTIALLY FREE ROTARY MOVEMENT AROUND SAID DRIVE SHAFT; A DRIVEN GEAR COUPLED FOR ROTATION WITH SAID DRIVEN SHAFT, SAID DRIVEN GEAR MATING WITH SAID DRIVE GEAR SUCH THAT ROTATION OF SAID DRIVE GEAR ROTATES SAID DRIVEN GEAR AND DRIVEN SHAFT; A FIRST DRIVE MEMBER SUPPORTED BY SAID SHAFT ADJACENT ONE SIDE OF SAID DRIVE GEAR; A SECOND DRIVE MEMBER SUPPORTED BY SAID DRIVE SHAFT ADJACENT AN OPPOSITE SIDE OF SAID DRIVE GEAR; FIRST COOPERATIVE MEANS ON SAID DRIVE SHAFT AND SAID FIRST DRIVE MEANS FOR MOVING SAID FIRST DRIVE MEMBER ALONG SAID DRIVE SHAFT TO ENGAGE SAID ONE SIDE OF SAID DRIVE GEAR IN RESPONSE TO ROTARY MOVEMENT OF SAID HAND CRANK AND DRIVE SHAFT IN ONE DIRECTION AND FOR MOVING SAID FIRST DRIVE MEMBER AWAY FROM SAID DRIVE GEAR IN RESPONSE TO ROTARY MOVEMENT OF SAID HAND CRANK AND DRIVE SHAFT IN AN OPPOSITE DIRECTION SUCH THAT ROTARY MOVEMENT IN SAID ONE DIRECTION IS IMPARTED TO SAID DRIVE GEAR WHEN SAID FIRST DRIVE MEMBER ENGAGES SAID DRIVE GEAR; SECOND COOPERATIVE MEANS ON SAID DRIVE SHAFT FOR MOVING SAID SECOND DRIVE MEMBER ALONG SAID DRIVE SHAFT TO ENGAGE SAID OPPOSITE SIDE OF SAID DRIVE GEAR IN RESPONSE TO ROTARY MOVEMENT OF SAID DRIVE SHAFT IN SAID OPPOSITE DIRECTION AND FOR MOVING SAID SECOND DRIVE MEMBER AWAY FROM SAID DRIVE GEAR IN RESPONSE TO ROTARY MOVEMENT OF SAID DRIVE SHAFT IN SAID ONE DIRECTION SUCH THAT ROTARY MOVEMENT IN SAID OPPOSITE DIRECTION IS IMPARTED TO SAID DRIVE GEAR WHEN SAID SECOND DRIVE MEMBER ENGAGES SAID DRIVE GEAR; FRICTION MEANS SUPPORTED BY SAID HOUSING FOR INHIBITING ROTATION OF SAID FIRST AND SECOND DRIVE MEMBERS; AND MEANS SUPPORTED BY SAID DRIVE SHAFT FOR LIMITING MOVEMENT OF SAID FIRST AND SECOND DRIVE MEMBERS AWAY FROM SAID DRIVE GEAR.