US3733122A - Random selection system for slide projectors and the like - Google Patents
Random selection system for slide projectors and the like Download PDFInfo
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- US3733122A US3733122A US00834040A US3733122DA US3733122A US 3733122 A US3733122 A US 3733122A US 00834040 A US00834040 A US 00834040A US 3733122D A US3733122D A US 3733122DA US 3733122 A US3733122 A US 3733122A
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- Prior art keywords
- tray
- circuit
- contact
- tens
- selector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
- H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
- H01H19/56—Angularly-movable actuating part carrying contacts, e.g. drum switch
- H01H19/58—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch
- H01H19/585—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch provided with printed circuit contacts
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B23/00—Devices for changing pictures in viewing apparatus or projectors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B23/00—Devices for changing pictures in viewing apparatus or projectors
- G03B23/02—Devices for changing pictures in viewing apparatus or projectors in which a picture is removed from a stock and returned to the same stock or another one; Magazines therefor
- G03B23/06—Devices for changing pictures in viewing apparatus or projectors in which a picture is removed from a stock and returned to the same stock or another one; Magazines therefor with rotary movement
Definitions
- the slide projector has a circular slide tray with 100 slide receiving spaces.
- An electric motor drives this tray and also movable contacts of a pair of variable resistors in the projector.
- a balancing resistance circuit connects the motor with the variable resistors in the projector and in the handpiece.
- PAIENIU MAY 1 51375 SHEET R (]F 9 R m w W OLEG SZYMBER BY M2 ATT'Y PATENTED W 3,733,122
- slide projectors intended for use by amateurs have been adapted to show slides only in a consecutive manner.
- Such projectors may include either box-like slide trays or circular slide trays.
- the trays are advanced in forward or reverse directions for pro pcting the slides in the sequence determined by their location in the slide tray.
- the present invention has to do with inexpensive and relatively uncomplicated means whereby any slide selected at random may be projected, thereby permitting the user to project slides in any order or sequence.
- a primary object of the present invention is the provision of a new and improved random selection system for slide projectors and the like.
- Another object of the present invention is the provision of a new and improved random selection system for slide projectors and the like, which system operates on a balancing resistance principle.
- Still another object of the present invention is the provision of a random selection system of the type de scribed, wherein such system includes a circuit with a plurality of contacts arranged according to a vernier principle.
- Another object of the present invention is the provision of a random selection system of the type described and wherein the slide tray will always move the minimum distance for presenting the selected space adjacent the projection gate or station.
- Another object of the present invention is the provision of a random selection system of the type described and for use in a projector which is adapted alternately to accommodate two slide trays, each tray having a plurality of uniformly spaced slide spaces, the trays differing from each other in the interval or spacing between adjacent slide receiving spaces.
- FIG. 1 is a perspective view of a slide projector em- "bodying the present invention
- FIG. 2 is an enlarged perspective view of the underside of a cap member mounted on a central hub of the projector;
- FIG. 3 is a perspective view of the slide projector hub with the cap of FIG. 2 removed;
- FIG. 4 is an exploded perspective view showing certain parts of the hub on the slide projector
- FIG. 5 is an enlarged top plan view of an arrangement of contacts for the 100 slide tray" shown in FIG. 1
- FIG. 6 is a view similar to FIG. 5 and showing the arrangement of contacts for an 80 slide tray;
- FIG. 7 is a vertical section taken through the central hub of the slide projector
- FIG. 8 is an exploded perspective view of the remote control handpiece associated with the projector
- FIG. 9 is a side elevational view of an internal subassembly of the remote control handpiece.
- FIG. 10 is an electrical schematic of the tens contacts and associated resistor network
- FIG. 11 is an electricalschematic of the units contacts and associated resistor network
- FIG. 12 is an electrical schematic of the components within the remote control handpiece.
- FIG. 13 is an electrical schematic of the components within the slide projector.
- the slide projector includes a housing or casing 12 rotatably supporting a circular slide tray, generally designated 14.
- the tray 14 hereinafter sometimes referred to as the 100 slide tray, includes one hundred radially disposed, slide receiving spaces.
- the slide projector includes suitable means for lowering a slide from the tray 14 to a projection gate or station and for lifting and returning such slide to its space in the tray.
- the slide projector 10 may be of the type disclosed and claimed in the pending application of Walter J. Hall, Ser. No. 684,202, filed Nov. 20, 1967.
- the only essential difference between the projector shown in the Hall application and the projector 10 resides in the indexing mechanism, i.e., the mechanism for stepping or advancing the slide tray.
- the indexing mechanism according to the Hall application advances the slide tray a distance represented by one tray space for each slide changing cycle. No such indexing mechanism need be provided with the projector 10 as the random selection system according to the present invention includes as an integral part thereof suitable indexing means for advancing the tray to present at the slide projection gate any slide space selected at random; It will be understood that the present invention is not to be limited with any particular type of slide projector.
- the circular slide tray 14 includes inner and outer continuous walls 15 and 16 supporting therebetween one hundred radially extending partition members 18 defining one hundred slide receiving spaces.
- the slide tray may be of the type disclosed in the aforementioned Hall application.
- the projector 10 is adapted to receive alternately the 100 slide tray 14 and another tray (not shown) identical in all respects with the tray 14 except for the number of slide receiving spaces.
- Such other tray hereinafter referred to as the slide tray, has 80 spaces, the partitions being spread or spaced farther apart than the partitions in the tray 14 to accommodate glass mounted slides.
- Such slides are thicker than cardboard slides which are received in the spaces 19 of the tray 14.
- the projector 10 includes a central stationary hub defined by an annular wall 22.
- This wall defines a chamber or space 23 mounting a reversible electric motor 24; this motor is mounted eccentrically of or to one side of a central shaft 25.
- the motor 24 includes a suitable gear in meshing engagement with a gear 27 mounted on a pin 28, the latter being suitably journaled adjacent its respective opposite ends.
- the pin 28 mounts a pinion gear 30 in meshing engagement with a larger gear 31;
- the gear 31 is mounted for rotation about the pin 25.
- the gear 31 includes an upwardly facing series of clutch teeth 33; these teeth are in releasable meshing engagement with identical teeth 34 integral with a cap or disk member 35.
- the cap 35 is held in place by a member 37, the latter being connected to the upper end of the post 25 by suitable means.
- the cap 35 includes a radially extending tab 38 (FIG. 1) which is received within a notch in the tray 14; this provides a driving connection whereby rotation is imparted to the tray 14 from the member 35.
- the releasable or slippable clutch teeth 33, 34 prevent damage to the drive train components in the event of energization of the circuit at a time when the tray is unable to move due to a restraining force being applied thereto, as for example, by a slide jammed between the projection gate and a space in the tray.
- the cap 35 mounts four contact members 40, 41, 42 and 43 for movement therewith.
- a pair of fasteners 45 mount these various contacts in a sandwich-type relation, the contacts being electrically isolated from each other by dielectric washers, such as the washer 46.
- Contact member 40 which is a tens contact for the 80 slide tray, includes contact fingers 40a and 40b.
- Contact member 41 which is the tens contact for the 100 slide tray, i.e., the tray 14, includes contact fingers 41a and 41b.
- the contact member 42 which is the units contact for the 100 slide tray, includes 10 equally spaced contact fingers 42a.
- Contact member 43 which is the units contact for the 80 slide tray, includes 10 equally spaced contact fingers 43a.
- FIGS. 3, and 6 This contact plate is best illustrated in FIGS. 3, and 6. It will be understood that in FIG. 5 only the movable contacts for the 100 slide tray are shown, i.e., movable contacts 41 and 42. In FIG. 6, only the movable contacts for the 80 slide tray are shown, i.e., contacts 40 and 43.
- the contact plate 50 includes a continuous annular contact strip 52; this strip is continuously wiped by the contact finger 41b.
- the plate 50 mounts contact strips 54 through 63.
- the outermost portions of the contact strips 54-61 and the two contact strips 62, 63, define 10 contact areas, each of identical arcuate extent, which are arranged for one-at-a-time wiping engagement by the contact finger 41a.
- a pair of arcuate contact strips 65, 66 are also mounted on the plate 50 in identical opposite hand relation. Each of these strips is always engaged by at least three of the contact fingers 42a. However, this is not critical, it being only necessary for one of the strips 65 or 66 to be engaged at all times by any one of the fingers 42a.
- the contact board 50 mounts a first set of units" contacts 70 through 74, and in diametrically opposed relation, a second set of units" contacts 75 through 79. These contacts are uniformly spaced apart and arranged to be engaged by the contact fingers 42a.
- the contacts 70-79 are arranged according to a vemier principle such that only one of these contacts may be engaged at any one time with one of the fingers 42a. Assuming rotation of the contact member 42 in a clockwise direction as viewed in FIG. 5, the contacts -79 are engaged according to the following sequence: 70, 75, 71, 76, 72, 77, 73, 78, 74, 79.
- the contact plate 50 will be seen to include a first set of units" contacts -84 and a second set of units contacts -89; the contacts 80-89 are preferably integral with the contacts 70-79, respectively. the contacts 80-89 are uniformly spaced apart and arranged for being engaged by the contact fingers 43a. The contacts 80-89 are arranged to be engaged by the fingers 43a according to a vemier principle whereby only one of the contacts 80-89 will be engaged at any one time by only one of the fingers 43a. Assuming clockwise rotation of the contact 43 as viewed in FIG. 6, the sequence of engagement of the contacts 80-89 is as follows: 80, 85, 81, 86, 82, 87, 83, 88, 84, 89.
- a pair of identical contact strips 91, 92 are mounted on the plate 50 adjacent the periphery thereof. Each one of these contact strips is always engaged by three of the contact fingers 43a. However, this is not critical as it is only necessary for one of the contacts 91 or 92 to be engaged at all times by one of the fingers 43a.
- the contact strips 54-61 at the innermost portions thereof, define eight contact segments or areas of equal arcuate extent (except for the inner arcuate portion of strip 54 as will be explained below); these contact areas may be considered as defining tens contacts, for establishing 79 positions of the 80 slide tray for numbers 01 through 79.
- the inner portion of contact 54 is slightly shorter than the corresponding portions of contacts 55-61; this inner portion of contact 54 defines positions or numbers 01 through 09.
- An innermost portion 62a of the contact 62 defines the 80 position of the 80 slide tray".
- the plate 50 is provided with a continuous annular contact strip 93 which is continuously wiped by the contact finger 40b.
- each of these contact engaging positions establishes a predetermined electrical resistance corresponding to each of the 100 spaces in the slide tray 14.
- These 100 different predetermined electrical resistances are established by arrangements of tens resistors 9511-951 and units" resistors 96a-96i connected to the various contact strips just mentioned as shown in FIGS. 10 and 11.
- resistors are included in series in the circuit.
- the tens resistors are of equal value and the units resistors are also of equal value, but this is not necessary. It should be understood that a parallel resistor network could be used with such resistors being of progressively increasing or decreasing value.
- the fixed resistors 95, 96 may be mounted on the underside of the plate 50.
- the contacts 41, 42 move in unison with the tray 14 during rotation thereof. It will therefore be appreciated that the arcuate spacing between the units contacts 70-79 is 3.6,
- the contact finger 40a is arranged for one-at-a-time wiping engagement with the tens contact strips 54-62.
- This arrangement of contact strips just described will provide 80 different predetermined electrical resistances corresponding to the 80 spaces in the 80 slide tray. Accordingly, the arcuate spacing between the contact strips 80-89 is 4.5, this being the result of 360 divided by 80.
- the contact strip 63and the resistor 95i connected thereto are not used when the projector is associated with the 80 slide tray.
- a remote control handpiece is connected to the slide projector by a suitable length of multiconductor cable 101.
- the cable 101 is connected with a plug 102 for detachable engagement with a jack 103 on the projector.
- the handpiece includes two shell members 105, 106 which house a subassembly, generally designated 107.
- the subassembly includes a pair of plates 108, 109, each being formed of dielectric material.
- the plate 108 rotatably mounts a units selector wheel 110 having peripherally arranged formations 1 10a to facilitate manual rotation thereof, as from engagement by the operators thumb.
- the shell 106 includes an opening 111 through which a portion of the selector wheel 110 extends for being manually rotated.
- Mounted for rotation with the selector wheel 110 is a cylinder 114 bearing the numerals 1 through 9 and 0. These numbers are visible one at a time through a window 1 in the shell piece 106.
- the selector wheel 110 mounts a contact (shown schematically as 145 in FIG. 12) for one-at-a-time engagement with an arrangement of 10 contact strips 116-126, mounted in insulated relation with each other on the plate 108.
- the contact strips 116-126 are connected with a series arrangement of resistors 127a through 127i so that 10 different resistances are established during a complete rotation of the selector wheel 110.
- the values of these resistors are such that the resistance will be varied in a progressive manner from a minimum value to a maximum value during a complete rotation of the selector 110.
- the arrangement just described defines a variable resistor of the rotary type.
- the plate 109 rotatably mounts a tens selector wheel 130 having peripherally arranged notches 130a to facilitate manual rotation.
- This selector wheel rotates a cylinder 132 identical with the cylinder 114 and bearing the same numerical indicia as the latter.
- a detent wheel 134 mounted for rotation with the selector wheel 130 is a detent wheel 134 having radially disposed fingers for being engaged by a spring biased detent finger 136, the latter being suitably secured in the shell piece 105.
- An identical spring biased detent finger 137 engages a detent wheel (not shown) mounted for movement with the selector wheel 110.
- the tens selector wheel 130 carries a contact (schematically indicated as 148 in FIG. 12) for movement with respect to an arrangement of contact strips identical, but in opposite hand relation, to the strips 116-126, these strips being mounted on the other side of the plate 107 and being connected with a series arrangement of resistors 128a through 128i (FIG. 12). Rotation of the selector wheel through a complete revolution will establish ten predetermined resistances in a progressive manner from a minimum value to a maximum value.
- the subassembly 107 mounts an initiate button 138 having a cross rib 139 which is received within a window or opening 140 formed in the shell piece 106. This better controls two sets of contacts for initiating a cycle of operation as will be explained below.
- Spring means (not shown) urge the button to an open position wherein such contacts are opened.
- FIG. 12 is an electrical schematic of the remote control handpiece 100
- the units" selector wheel 110 carries the contact which engages in one-at-a-time relation the various contact strips 116-126 on the plate 107, these contact strips being connected to the various resistors 127a-127i.
- the tens selector wheel 130 carries the contact 148 for one-at-a-time engagement with the various contact strips (not shown) on the plate 107, such contact strips being connected to the resistors 128a-l28i in series relation.
- a movable contact 150 is moved in unison with the contact 148 through a suitable mechanical connection, including a pair of gears or friction rollers 151, 152.
- Spring means are provided for normally holding the contact 150 in the position illustrated wherein the same is in engagement with a fixed contact 154.
- the initiate button 138 is connected with the friction wheels 151, 152, in such manner that when the initiate button is actuated, the wheels 151, 152 will be separated allowing the aforementioned spring means to return the contact 150 to the position illustrated, i.e., into engagement with the fixed contact 154.
- the units selector wheel 110 carries a contact 157; this movable contact engages a stationary contact 158 only when the selector wheel 110 is positioned for locating 0 in the window 1 15.
- the contact 157 is in engagement with a contact strip 159 at any position of the selector wheel 110 between l and 9.
- the tens selector wheel 130 carries a contact 160; this contact is arranged to engage an arcuate contact 161 as the selector wheel 130 is rotated to any position between l and 7. It is noted that the contact 160 will engage short fixed contacts 162 and 163 when the selector wheel 130 is rotated to position numerals 8 and 0, respectively within the window 115. A dead contact is pivoted at 9.
- An 80-100 selector button 142 which is mounted on the projector (FIG. 1), operates a contact 164 for alternate engagement with a pair of fixed contacts 165, 166, representing respectively the 100 and 80 positions of the selector button 142.
- the initiate switch 138 operates a pair of contacts 168, 169 for momentary engagement with respective fixed contacts 170, 171, suitable spring means (not shown) being provided for urging the button 138 and the contacts moved thereby to the open position illustrated.
- operation of the initiate button 138 closes the circuit for initiating a cycle of operation.
- the movable contacts 157 and 160 are provided to prevent closing of the circuit by the initiate button when the selector button 142 is in the 80 position, i.e., when the contact 164 is in engagement with the contact 166, and when any number from 81 to 100" is dialed or established by the selector wheels 110, 130. It should be apparent that when the selector button 142 is in this position and when any such number is selected, it will not be able to close the circuit notwithstanding actuation of the initiate button.
- the circuit may be traced as follows: terminal 166, switch contacts 171, 169, contact 160 and terminal 172.
- the contact 157 serves no function.
- FIG. 13 is an electrical schematic of the circuit within the projector 10, it will be understood such circuit is connected to the circuit within the remote control handpiece 100 by suitable connection at the terminals 165, 166, 172, 173, 188 and 218.
- a six conductor cable or cord connects the handpiece with the projector.
- the circuitry within the projector is of the balancing resistance type. That is to say, the circuit will cause energization of the motor 24 when the electrical resistance established in the remote control handpiece is different than the resistance established by the variable resistors within the projector. When these resistances are equal or in a balanced condition, the motor will be de-energized.
- a simplified form of units" contacts has been schematically illustrated in FIG. 13. As noted, one movable contact 42a for the 100 slide tray 14 has been shown, and likewise one movable contact 43a for the 80 slide tray has been shown. With such an arrangement, the units" contact 42a may be driven by a suitable gearing arrangement 175 at a l:l ratio with the tens" contact 41a.
- the contact 43a is driven by an appropriate gearing arrangement 176 at a :1 ratio with the movable contact 40a.
- the gearing arrangements 175, 176 are each driven by the motor 24. It will be appreciated this construction will provide the same switching arrangement as is achieved by the vemier type of units contacts illustrated in FIGS. 5 and 6; the arrangement according to these two figures is preferred as it obviates the use of the drive gear arrangements 175, 176.
- the selector button 142 also controls a pair of switches 177, 178; these switches are shown in the lOO" position.
- Power for the circuit is obtained from a transformer 180, which may be constituted by the secondary windings of a fan motor (not shown) included within the slide projector 10 and energized by alternating current.
- the motor 24 is controlled primarily by a transistor 181 (NPN) and a relay 182.
- NPN transistor 181
- PNP transistor 183
- Another transistor 183 (PNP) and an associated relay 184 participate to reverse the motor 24 for achieving what is termed a short-way home operation; this feature will be described hereinbelow.
- the variable resistor networks controlled by the tens and units selector wheels in the remote control handpiece will be referred to as Tr and Ur, respectively.
- the tens" and units variable resistor networks within the projector will be identified as T and U, respectively.
- Ur and U form a series circuit with the power transformer 180, which is an A.C. power source for the circuit.
- Point 185 of the transformer is set at half the voltage between points 186 and 187.
- Point 188 will also be at one half the voltage of points 186 and 187 if the resistance of Ur is equal to the resistance of U, since Ur and U represent a voltage dividing network.
- Diodes 231, 232 are holding diodes which prevent deenergizing of the relays 182, 184 during the momentary of state of the transistors 181, 183. This momentary off condition of the transistors is due to the alternating current base signal.
- Energizing of the relay 182 will also serve to lock the relay 184 in its energizing state bypassing the transistor 183.
- This circuit is as follows: point 187, diode 219, relay coil 184a, contacts 195, 196 of relay 182, contacts 214, 213 of relay 184 and point 185.
- relay 182 will close the circuit to the motor 24 for energizing the latter as follows: point 186, resistor 234, diode 227, contacts 205, 204 of relay 184, contacts 193, 192 of relay 182, motor 24, contacts 207, 208 of relay 184, point 187.
- This condition that is, energization of the motor 24
- This condition that is, energization of the motor 24
- the tray will now have been rotated to position the selected slide adjacent the projection gate of the projector. This completes a cycle of operation in the example just described.
- the circuit to the motor will be as follows: point 186, resistor 234, diode 227, contacts 209, 207 of the relay 184 (which is not energized during this example), motor 24, contacts 192, 193 of the energized relay 182, contacts 204, 206 of the de-energized relay 184, and then to point 187.
- the relay 184 which is controlled by the transistor 183, is not energized. It should be apparent that the transistor 183 can be turned on" only when point 187 is negative because of diode 219.
- the contact 42a and the tray will again be rotated, but in an opposite or clockwise direction until the resistance U -U are balanced.
- Tr and T will energize the circuit in the same manner as just described. Movement of both the tens and units selector wheels 130 and 110 also establishes an unbalanced condition to energize the circuit and rotate the tray as well as contacts 41a and 42a until a balanced resistance condition is reestablished thereby to de-energize the motor.
- Tr-T and Ur-U networks are similar, it is necessary to use the diodes 190, 190a in order to discriminate-between respective balances established by Ur and U on the one hand and Tr and R on the other hand. For example, without these diodes, a balanced condition would exist when:
- the transistor 181 and associated relay 182 serve to complete a circuit for energizing the motor 24.
- the transistor 182 and as sociated relay 184 act to determine in which direction the motor 24 turns.
- the invention is not to be limited to the particular arrangement shown. That is to say, the transistor 183 and associated relay 184 might come into play during the forward direction, and only the transistor 181 and associated relay 182 coming into play during the reverse operation.
- the short-way home feature has just been described when moving the units selector wheel 110. Now, the short-way home feature will be described in connection with movement of the tens selector wheel 130.
- the tray should rotate in a clockwise direction.
- the tens selector is moved to select a higher number, say 95, when the previous selection was 05"
- the tray should now rotate in a counterclockwise direction.
- the direction of rotation of the tray is not necessarily a function of whether the new selection is a higher number than the previous selection, but rather what positional relationship, proceeding either clockwise or counterclockwise around the tray, the selected space bears with respect to the previously selected space.
- the tray should of course never rotate more than approximately 180.
- the circuit is simply designed by selecting appropriate values of the components so that the tray will rotate in one direction arbitrarily chosen.
- the selector wheel 130 controls the movable contact 150 of the mono-stable switch. Assuming that the tens selector 130 is rotated from 12" to select 22", contact 150 is rotated in a clockwise direction thus adding the resistance of fixed resistor 222 to Ur so that the combined value of resistor 222 and Ur will always be greater than the resistance value of U. This will result in maintaining transistor 183 in an of condition.
- transistor 181 When the initiate button 138 is actuated, transistor 181 will be biased on energizing relay 182 and motor 24 provides for rotation of the tray in its normal clockwise direction. Of course, as soon as the initiate button 138 is actuated, the friction wheels or gears 151, 152 are disengaged, allowing the contact 150 to swing back to its position shown.
- relay 184 After electrical contact is established by closing contacts 168 and 170, relay 184 will remain locked in the position shown (deenergized) for the remaining search cycle. When contact 150 returns to its position shown, i.e., into engagement with contact 154, the resistor 222 is shunted.
- the operation of the circuit is the same when the selector member 142 is moved to the eighty position. As explained above, when the selector is in this position, it is not possible to energize the circuit when a number between 8 l and 100 is selected. Or in other words, when the selector switch 142 is in the eighty" position, it is only possible to energize the circuit when tray spaces 01" through 80" are selected. When the selector switch 142 is in the 100" position, it is possible to select any of the spaces between 01" and 100.
- a projector of the type having a projection gate and an associated circular tray with a plurality of spaces therein for receiving respective transparencies to be projected, the improvement for rotating said tray to present adjacent such gate any of said tray spaces selected at random comprising:
- a. input means including a tens selector and a units selector for selecting by number any of the spaces in said tray;
- first variable resistance means including a first pair of variable resistors operated by the tens and units selectors of said input means for establishing a predetermined electrical resistance for each numerical selection made by the input means;
- second variable resistance means including a second pair of variable resistors
- circuit means connecting said motor and said first and second variable resistance means and adapted to energize said motor when the respective resistances established by said first and second variable resistance means are in a first relationship with respect to each other and to de-energize said motor when the respective resistances established by said first and second variable resistance means are in a second relationship with respect to each other;
- means for rotating said circular tray the minimum distance to present the selected tray space adjacent the projection gate including a reversing circuit and other circuit elements in said circuit means to advance the tray in one direction and to alternately advance the tray in the other direction, and other means controlled by said input means for deenergizing said reversing circuit when a selected space occupies a first relationship to the previously selected space and to energize said reversing circuit when a selected space occupies an opposite relationship to the previously selected space.
- a projector of the type having a projection gate and an associated circular tray with a plurality of spaces therein for receiving respective transparencies to be projected, the improvement for rotating said tray to present adjacent said gate any of said tray spaces selected at random comprising:
- a. selector means including a tens selector and a units" selector for selecting by number any of the spaces in said tray;
- first variable resistance means including first and second contacts moved by said tens selector and said units" selector, respectively, to establish a predetermined electrical resistance for each number selected by said selector means:
- second variable resistance means including tens" and units movable contacts
- drive means connected with said motor for moving said tens and units" contacts simultaneously with the movement of said tray to establish a predetermined electrical resistance for each position of said tray as defined by the spaces therein being presented one at a time adjacent said gate;
- circuit means connecting said motor and said first and second variable resistance means and adapted to energize said motor when the respective resistances established by said first and second variable resistance means are unequal and to de-energize said motor when the respective resistances established by said first and second variable resistance means are equal;
- means for rotating said tray the minimum distance to present a selected space at the projection gate including a forward circuit portion and a reverse circuit portion for driving said motor in forward and reverse directions to impart corresponding movement to said tray, first and second switching means for energizing said forward and reverse circuit portions, respectively, and other circuit means controlled by said tens and units selectors for switching said first switching means when the space selected occupies a first relationship to the previously selected space and for switching said second switching means when the space selected occupies a second relationship to the previously selected slide.
- said circuit means including a first transistor and a first relay controlled thereby which are energized when said tray is advanced in said one direction;
- said reversing circuit including a second transistor and a second relay controlled thereby which are energized when said tray is advanced in said other direction;
- said other means including means for alternately triggering said first and second transistors into conducting conditions.
- circuit means and said reversing circuit being controlled by first and second switching means, respectively;
- first and second circuit element means alternately connected in said circuit means depending on the extent of movement of said tens" selector.
- said other circuit means including a mono-stable switch operated by said tens selector;
- said fixed tens contacts being shaped and arranged to define a number of contact segment portions forming a first annular pattern and a different number of contact segment portions forming a second annular pattern adjacent the first annular pattern;
- said fixed units contacts having inner and outer portions, the inner portions being spaced closer together than the outer portions;
- said tens movable contact including said firstmentioned contact finger and another contact finger arranged for respective wiping engagement with said first and second contact pattern portions;
- said units movable contact including said other fingers and another set of such fingers arranged for respective wiping engagement with said inner and outer contact portions, the other set of contact fingers being arranged such that only one of the latter engages only one of said outer contact portions at any one time;
- switch means for connecting said contact finger and said other fingers in said circuit alternately with said another contact finger and said other set of contact fingers.
- said circuit means including a forward circuit portion and a reverse circuit portion for driving said motor in forward and reverse directions to impart corresponding movement to the tray operatively associated with said projector;
- said switching means includes a pair of transistors.
- said other circuit means including a mono-stable switch operated by said tens" selector;
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Abstract
Description
Claims (11)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US83404069A | 1969-06-17 | 1969-06-17 |
Publications (1)
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US3733122A true US3733122A (en) | 1973-05-15 |
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00834040A Expired - Lifetime US3733122A (en) | 1969-06-17 | 1969-06-17 | Random selection system for slide projectors and the like |
Country Status (4)
Country | Link |
---|---|
US (1) | US3733122A (en) |
JP (1) | JPS514647B1 (en) |
DE (1) | DE7022700U (en) |
GB (1) | GB1274981A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3872505A (en) * | 1971-06-16 | 1975-03-18 | Matsushita Electric Ind Co Ltd | Automatic cartridge changer |
US3907414A (en) * | 1972-11-11 | 1975-09-23 | Canon Kk | Optical projector capable of random access and repeat projections |
US4025177A (en) * | 1974-04-29 | 1977-05-24 | Addressograph Multigraph Corporation | Microfiche viewer |
WO1989004566A1 (en) * | 1987-11-10 | 1989-05-18 | Siemens Aktiengesellschaft | Coding element |
US20100182574A1 (en) * | 2009-01-22 | 2010-07-22 | Texas Instruments Incorporated | System and Method for Reducing the Effect of an Image Artifact |
FR3000836A1 (en) * | 2013-01-04 | 2014-07-11 | Peugeot Citroen Automobiles Sa | Rotary contact device for use in control device that is utilized to control electric window of car, has contact element whose base contact surfaces are arranged so as to present offset similar to that of contact surfaces of contact zones |
USD741162S1 (en) * | 2014-01-27 | 2015-10-20 | Maxdao Limited | Flexible cable clamp |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6587229B1 (en) * | 1998-09-30 | 2003-07-01 | Heidelberger Druckmaschinen Aktiengesellschaft | Method and apparatus for scanning masters |
US6580527B1 (en) * | 1998-09-30 | 2003-06-17 | Heidelberger Druckmaschinen Aktiengesellschaft | Method and arrangement for scanning masters |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2889507A (en) * | 1957-10-07 | 1959-06-02 | Danly Mach Specialties Inc | Servosystem adapted for die-forming press slide positioning |
US3225652A (en) * | 1962-03-28 | 1965-12-28 | Spindler & Sauppe | Remote control slide projector |
US3296727A (en) * | 1964-10-09 | 1967-01-10 | Decision Systems Inc | Random access projector |
US3510215A (en) * | 1967-10-02 | 1970-05-05 | Gaf Corp | Random access means for slide projectors |
US3527993A (en) * | 1968-02-12 | 1970-09-08 | Jerrold Electronics Corp | Solid state motor driven antenna rotator control circuit |
-
1969
- 1969-06-17 US US00834040A patent/US3733122A/en not_active Expired - Lifetime
-
1970
- 1970-06-15 JP JP45051828A patent/JPS514647B1/ja active Pending
- 1970-06-16 GB GB29207/70A patent/GB1274981A/en not_active Expired
- 1970-06-16 DE DE19707022700U patent/DE7022700U/en not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2889507A (en) * | 1957-10-07 | 1959-06-02 | Danly Mach Specialties Inc | Servosystem adapted for die-forming press slide positioning |
US3225652A (en) * | 1962-03-28 | 1965-12-28 | Spindler & Sauppe | Remote control slide projector |
US3296727A (en) * | 1964-10-09 | 1967-01-10 | Decision Systems Inc | Random access projector |
US3510215A (en) * | 1967-10-02 | 1970-05-05 | Gaf Corp | Random access means for slide projectors |
US3527993A (en) * | 1968-02-12 | 1970-09-08 | Jerrold Electronics Corp | Solid state motor driven antenna rotator control circuit |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3872505A (en) * | 1971-06-16 | 1975-03-18 | Matsushita Electric Ind Co Ltd | Automatic cartridge changer |
US3907414A (en) * | 1972-11-11 | 1975-09-23 | Canon Kk | Optical projector capable of random access and repeat projections |
US4025177A (en) * | 1974-04-29 | 1977-05-24 | Addressograph Multigraph Corporation | Microfiche viewer |
WO1989004566A1 (en) * | 1987-11-10 | 1989-05-18 | Siemens Aktiengesellschaft | Coding element |
US20100182574A1 (en) * | 2009-01-22 | 2010-07-22 | Texas Instruments Incorporated | System and Method for Reducing the Effect of an Image Artifact |
US8113662B2 (en) * | 2009-01-22 | 2012-02-14 | Texas Instruments Incorporated | System and method for reducing the effect of an image artifact |
FR3000836A1 (en) * | 2013-01-04 | 2014-07-11 | Peugeot Citroen Automobiles Sa | Rotary contact device for use in control device that is utilized to control electric window of car, has contact element whose base contact surfaces are arranged so as to present offset similar to that of contact surfaces of contact zones |
USD741162S1 (en) * | 2014-01-27 | 2015-10-20 | Maxdao Limited | Flexible cable clamp |
Also Published As
Publication number | Publication date |
---|---|
DE2029803B2 (en) | 1977-05-18 |
JPS514647B1 (en) | 1976-02-13 |
GB1274981A (en) | 1972-05-17 |
DE2029803A1 (en) | 1971-11-04 |
DE7022700U (en) | 1970-10-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: VIEW-MASTER INTERNATIONAL GROUP, A LIMITED PARTNER Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GAF CORPORATION;REEL/FRAME:004048/0981 Effective date: 19810329 Owner name: VIEW-MASTER INTERNATIONAL GROUP, P.O. BOX 490, POR Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GAF CORPORATION;REEL/FRAME:004048/0981 Effective date: 19810329 |
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AS | Assignment |
Owner name: VIEW-MASTER INTERNATIONAL GROUP, INC. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VIEW-MASTER INTERNATIONAL GROUP, A LIMITED PARTNERSHIP OF NY;REEL/FRAME:004197/0867 Effective date: 19831026 |
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AS | Assignment |
Owner name: MIDLANTIC NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:VIEW-MASTER IDEAL GROUP, INC.;REEL/FRAME:005240/0060 Effective date: 19890906 Owner name: MIDLANTIC NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:VIEW-MASTER IDEAL GROUP, INC.;REEL/FRAME:005240/0039 Effective date: 19890906 |