US3709085A - Teaching device for attachment to a keyboard instrument - Google Patents

Abstract

A device non-integral with the keyboard instrument with which it is used is activated through sheet, card or substitute keyboard means to activate in turn indicating heads mounted over the keyboard of an organ, piano or similar instrument and which designate the keys to be played by lighting or solenoid controlled means. The control sheet or card may utilize raised, indented, or apertured sheets or cards detected through various type contact or photocell means which feed the signal through an electronic relay to the indicating means.

Description

O Ulllted States Patent i191 i111 3,709,085 Del Castillo [451 Jan. 9, 1973 [54] TEACHING DEVICE FOR 1,112,657 i0/i9i4 Reed s4/147 ATTACHMENT TO A KEYBOARD 1,187,697 6/1916 Austin ..84/147 1,530,123 3/1925 J0nes..... 84/166 X INSTRUMENT 1,696,901 1/1929 Bostelman. ..84/478 [76] Inventor: Juan M. Del Castillo, Risco No. 119, 2,452,034 10/1948 Campbell .....340/373 Mexico, Mexico 2,505,608 4/1950 Edwards ..84/470 3,069,959 12/1962 Foufounis et al ..84/477 [22] Filed: April 20, 1971 3,235,265 2/1966 Morrison etai 274/41 x 3,335,630 8/1967 Schmoyer ..84/478 [2l] Appl' No" 135601 3,456,546 7/1969 welsh etai s4/47s 3,595,122 7/1971 Brediceanu ..84/484 [30] Foreign Application Priority Data Primary Examiner-Richard B. Wilkinson Aug. 3, 1970 Mexfco ..121258 Assistant Examiner Lawl-ence R Franklin June 26, 1970 Mexico.... ..120372 Att0mey Ka-| W. Flocks June 26, 1970 Mexico.... 120373 June 26, 1970 Mexico.... ..120374 [57] ABSTRACT J l 10,1970 M ..120687 uy exlco A device non-integral with the keyboard instrument [52] U.S CL l 84H66 84/147 84/478 with which it is used is activated through sheet, card 116 /128 or substitute keyboard means to activate in turn in- [51] lm C. Glos 5/04 dicating heads mounted over the keyboard of an or- [58] Fied 470 477 gan, piano or similar instrument and which designate the keys to be played by lighting or solenoid con- 84/478 116/128 274/4 J 340/373 trolled means. The control sheet or card may utilize [56] References Cited raised, indented, or apertured sheets or cards detected through various type contact or photocell means UNITED STATES PATENTS which feed the signal through an electronic relay to the indicating means. 498,573 5/1893 Riegger ..84/166 X 1,107,558 8/1914 Turney ..84/166 17 Claims, 17 Drawing Figures PATENTE() JM 9 |973 SHEET 1 UE 7 f IN'VENTOR l LIANMgDEL CASTILLO l.. UX'FOCKS ATTORNEY PAIENIEDJM 9 |915 3.7091385 SHEET 8 8F 7 INVENTOR JUAN M DEL CASTILLO BLKPHL @ROCKS ATTORS'Y PATENTEUJAN 91975 3. 709,085

SHEET 3 UF 7 INVENTOR JUAN MDEL CASTILLO BYARL FLocKs ATromTs' PATENIEDJAH 91975 3, 709,085

SHEET u nr 7 INVENTOR JUAN MDEL CAsTlLLO B KARL LJQOQKS PATENIEUJM 9 Isra SHEET 5 UF 7 will 59o l "mit" INVENTOR i 41' v. JLLII MDEL CASTILLO u ATTORNEY BYA QL. LQ FLOCKS PATENIEDJAN 9ms 709.085

' SHEU s UF 7 INVENTOR JUAN M.D:E.L CASTILL Blll. LFOCKS I ATTORNEY PATENIEUJM 9 |915 SHEET 7 UF 7 INVENTOR JUAN MDIL CASTILLO ATTORNEY TEACHING DEVICE FOR ATTACHMENT TO A KEYBOARD INSTRUMENT BACKGROUND OF THE INVENTION The present invention refers to a teaching device to facilitate learning to play melodies on any keyboard driven musical instrument and in particular it refers to such a teaching device which may be easily mounted on such a keyboard instrument without any alterations to the internal portions of the musical instrument if it is not desirable to make such alterations. A selected musical score used in the device will activate lights and/or solenoids to designate the keys as they are to be played thereby allowing a pupil to play the music by following the lights or alternatively to listen to the music being played while noting the keys which are being used to play this music.

The prior art has disclosed teaching devices with light designated keys in accordance with some control record sheet or card and also has disclosed means of playing a keyboard instrument automatically through such means coupled with solenoid or similar means. But in all cases in the prior art, the means to accomplish this has been structure which requires extensive alterations to the keyboard instrument or must necessarily have been built into the instrument at the time of manufacture.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a teaching device which may be controlled so as to indicate the keys in order and in proper time relation to each other which are to be played on a keyboard musical instrument to allow a pupil to play music thereon.

It is a further object of the present invention that such teaching device be easily mountable upon the keyboard musical instrument without any disturbance to the internal portions of the musical instrument, and, in effect, be made so as to be easily portable and used without change between several similar type keyboard musical instruments.

It is a further object of the present invention to designate the proper keys to be played by optical means and to allow the simultaneous playing of these keys automatically when such combination use is desired.

It is a still further object of the present invention that the control of such indicating means be through use of a record sheet or card having either raised portions, indented portions, or transparent windows or apertures therethrough.

Another object of the present invention is that the control means bc a simulated keyboard operated by a teacher to control the indicating means which will allow a pupil to follow the teacher in the operation of the proper keys on the keyboard.

Basically, the present invention utilizes a control means which is either a reading head or a simulated keyboard which sends electrical signals'to indicating heads mounted over a keyboard or keyboards to light specific keys and manipulate these keys where desired in accordance with the music to be played on said musical instrument.

BRIEF DESCRIPTION OF THE DRAWING The above, as well as further objects and advantages which are inherent in the invention,will become apparent from the following description, reference being had to the accompanying drawings wherein:

FIG. l is a perspective view of the device of the present invention mounted for operation on an organ;

FIG. IA is an enlarged perspective diagrammatic view of a reading head without its cover and an enlarged showing of the indicating head with a broken away portion showing details of mounting said indicating head;

FIG. 2 is a combination wiring diagram schematic in diagrammatic view of one embodiment of an overall system of the present invention;

FIG. 3 is a perspective view with broken away portion of a reading head having the embodiment of the reading device portion of FIG. 2;

FIG. 4 is a perspective view ofa second embodiment of a reading head utilizing a different form of control sheet;

FIG. 5 is a vertical sectional view of the reading head of FIG. 4 taken along line 5 S;

FIG. 6 is a perspective view of a form of the record sheet or card used with the reading head of FIGS. 4 and 5 and also with other embodiments described below;

FIG. 6A is an enlarged fragmentary perspective view ofa portion ofa modified record sheet or card;

FIG. 7 is a vertical sectional view of another embodiment of a reading head of the present invention which is a variation of that shown in FIGS. 4 and 5 and which may also be used with the record sheet or card of FIG. 6;

FIG. 8 is a perspective view of a third embodiment of a reading head of the present invention;

FIG. 9 is a vertical sectional view of the reading head of FIG. 8 taken along line 9 9;

FIG. l0 is a perspective view of a fourth embodiment of a reading head of the present invention;

FIG. 11 is a vertical sectional view of the reading head of FIG. 10 taken along line 11- l1;

FIG. l2 is a sheet or card form for use with the reading head shown in FIGS. l0 and ll;

FIG. 13 is a perspective view of another embodiment of an indicating head that can be used with the apparatus of FIG. l;

FIG. 14 is a vertical sectional view of FIG. 13 taken along line I4 14; and

FIG. 15 is a perspective view of the teaching device ofthe present invention with a different control means utilizing a teachers keyboard to control an indicating head as in FIGS. l and 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring first to FIG. l, there is shown a form of the teaching device ofthe present invention mounted for use with an organ. A reading head l0 which need not occupy too much space is placed on a convenient surface such as the top of the organ or, alternatively, it may be placed on a small table beside the organ. Such positioning is merely for the convenience of one who will feed the record sheet or card to the reading head l0. Attached by cables ll to the reading head l0 are indicating heads 12 which may be attached to the musical instrument over the keyboards 14 or may be merely stood over the keyboards 14 on their legs 21 which support the housing 22 of the indicating heads 12 over the keyboards 14 of the organ. In each of the housings 22 there are mounted a plurality of bulbs 23 and solenoids 24 electrically connected to the cable 11 from the reading head 10. As can be noted in FIG. l, the organ shown therein has two sets of keys 14 and a set of foot pedals 14 each of which has an indicating head 12 standing over it. The number of indicating heads l2 can, of course, be adapted to conform to the keyboard instrument being used since in the case of a piano there being only one set of keys 14, only one indicating head 12 may be necessary, and since the foot pedals do not control as much of the musical instrument as in the organ, no indicating head 12 may be necessary for use with the foot pedals of the piano.

As can be seen, no actual attachment of any portion of the teaching device is necessary to the organ and this device may be easily transferred from one musical instrument to another of the same type without difficulty or alterations to the musical instrument. It is optional whether the indicating heads merely stand on their legs 21 over the keyboards 14, 14 or whether a screw attachment to the piano surface is made.

As shown in the detail view in FIG. 1A, in each of the housings 22 of indicating heads l2 there is located a plurality of solenoids 24, each having a plunger 25 which contacts a key of keyboard 14. Also mounted in the housing 22 are a plurality of light bulbs 23 with each of the bulbs having a lens portion 26 in its tip which allows a concentration of the light on the particular key being designated to be played.

ln FIG. 2 there is shown a diagrammatic view of the device of FIG. l with one of the embodiments of a reading head 110 used with the present invention shown therein. This embodiment of the reading head 110 is shown in a perspective view in FIG. 3.

A record sheet 40 is fed in through the guide 51 past the plurality of contacts 52 which are arranged transversely of the guide 51 and record sheet 40 and are separated by insulated separators 53 to prevent lateral movement of the contact 52. The record sheet 40 is fed into the rollers 54, 55 wherein the upper roller 54 is connected through its axle 56 to a constant speed motor 57 and the idler roller 55 below it is mounted in a support 58 on a compression spring or springs 59 which supports the holder 58 for the axle 60 for the idler roller 55. The record sheet 40 is then continued in its travel against the curved surface of the back 61 of the reading head 110 and curves back and out of the reading head. An additional contact 62 shown is connected to a microswitch 63 and positioned for alignment with notch 49 (FIG. l2) so that immediately before the passage of the end of the record sheet 40 the current through the contacts 52 is shut off to prevent the possibility of too much current through all contacts 52 making contact with the conducting surface 64 mounted on an insulated base 65 and thereby burning out the equipment. The record sheet 40 which in the present case is shown as having apertures 4l therethrough passes beneath the contacts 52 and when an aperture 4l passes beneath the contact 52, the contact 52 is allowed to drop into the space 41 therein in the card or sheet 40 and contact the conducting surface 64. This closes the circuit wherein current is passed through the electronic relay 66 with the transistor 67 and resistors 68-70 in the configuration shown so as to pass current to the indicating head or heads l2. Depending upon which contact 52 closes, the circuit to the connecting solenoid 24 or light bulb 23 is activated. The switches 71-73 shown in the housing, which of course are merely shown there for convenience, and may be mounted in any convenient place, determine whether it is to be used to show the key designated (switch 71) or whether a plunger on the respective solenoid will be activated (switch 72) through the switching arrangement shown. Either or both (switch 73) may be activated. The bulbs 23 preferably each have lens portion 26 in their tip which allows a concentration ofthe light on the particular key designated. Instead of using such a special bulb, it is possible to include a housing for each bulb having a lens portion in its tip which will operate in a like manner to the bulb shown. The constant speed motor 57 which operates in the reading head so as to move the record sheet 40 through at a properly designated timing for the music being played may be made to operate at variable speeds for setting in accordance with the proper tempo of the music being played. A simple rheostat arrangement will accomplish this but is not shown in the drawings.

A second embodiment in a reading head which may be used in this device of the present invention is reading head 210 shown in the perspective view of FIG. 4 and the vertical sectional view of FIG. 5. The electrical connections between the units are the same but in this case a twin wheel roller 254 to move the record sheet or card 44 is used as shown, with this roller 254 being driven by a constant speed motor 57. The roller 254 could also be effective with a single or more than two wheels. The record sheet 44 utilized in this embodiment has raised portions 45 thereon and is of the type shown in FIG. 6. As the roller feeds record sheet 44 past the contact 252, the contact 252 is raised upon being pushed up by a raised portion 45 on the sheet 44 and makes contact with a common conductor 264 thereby closing the circuit so that the circuit from that individual contact 252 is closed to a designated lamp 23 or solenoid 24 in the indicating head 12 as in the case with the previous embodiment. Insulated supports 275 and 276 shown merely limit the downward and upward movement of the contact 252 respectively, with the upward motion limited through the positioning of the common conductor 264 thereabove and lateral movements limited by insulated separators shown similarly to insulated separators 53 in a previous embodiment.

It has been found that when the raised portions 45 are utilized on the record sheet or card 44, the apparatus will work in a much better manner with sloped forward edges 46 and sloped rear edges 47 on raised portions 45. Alternatively, as shown in FIG. 6A, the sheet or card 44 may have a raised portion 45' with a channel or groove 48 in its top surface and cut from sloping surface 46', as shown in order to help guide contact 252. In utilizing such raised portions a mold may be made up for a particular musical pattern and this mold may be used to stamp out record sheets or cards 44 in large quantities very inexpensively and with more accuracy and speed than might be found in some punching operations when utilizing an apertured card or sheet 40. It has also been found that the raised portions 45 tend to endure in some cases due to the material used in making these records sheets 44 as well and in some cases better than the aperture cards 40.

A third embodiment of the reading head which will utilize the record sheet 44 shown in FIG. 6 is reading head 310 shown in FIG. 7. This variation of the reading head previously discussed in connection with FIGS. 4 and 5 also utilizes a twin wheeled roller 254, although a single wheeled roller or one having additional wheels can be used, operated by a constant speed motor to advance the record sheet or card 44, with the raised portion 45 thereon, past the row of contacts. But in this case each of the contacts 352 has its own individual microswitch 378 and upon the operation of contact 352 by a raised portion 45, the circuit which is closed by that microswitch 378 operates in the manner previously described to operate a light 23 or solenoid 24 in the indicating head 12.

A fourth embodiment of a reading head which may be operated within the wiring as described in FIG. 2 is reading head 410 shown in the perspective view and vertical sectional view of FIGS. 8 and 9, respectively. Again a twin wheeled roller 254 operated by a constant speed motor 57 is shown to be used to feed the card or sheet 44 to the contacts 452. Also, as mentioned with some previous embodiments, the card or record sheet 44 of FIG. 6 is used having raised portions 45 to operate the contacts 452. The contacts 452 in this case are mounted so as to have a common pivot rod 480 through all of the contacts 452 situated transversely of the moving record sheet 44 and a feeler point 481 below and just past the pivot rod 480 connected to an arm 482 which rests on a support member483. On the opposite end of. arm 482 from feeler point 481 and vpivot rod 480 there is an insulated member 484 with a contact finger 485 attached thereto connected to the cable 11 having its opposite end from the insulated member 484 resting upon a contact limit support 486. Above this contact finger is located a support 476 having a common wire 464 attached thereto. In operation, the record sheet or card 44 is advanced by the roller 254 toward and beneath the feeler point 481 which upon encountering the raised portion 45 is thereby raised, causing the arm 482 to pivot about the pivot rod 480, thereby raising the opposite end of the arm from the feeler point 481, raising the insulated member 484 and thereby raising the contact finger 485 into contact with the common wire 464, and closing the circuit which may be similar to that shown in FIG. 2. The solenoid 24 or lamp 23 associated with that contact finger 485 is then operated.

A fifth embodiment ofa reading head for the present invention is reading head 510 shown in perspective and vertical sectional view in FIGS. l0 and 1l, respectively. This form of the reading head operates with a record sheet or card 40' of the type shown in FIG. 12 having apertures or transparent windows 4l through an opaque surface 42. The record sheet or card 40' is fed along guide 551 and between guide S87 and guide base 588. The record sheet 40' then passes between the photocell 589 and the lamp 590 over the aperture 591. With this embodiment, whenever an opening 41 in the cardor sheet 40' coincides with the aperture 591, the light from the lamp 590 is detected by the photocell 589 mounted on support 592 and the circuit to the appropriate electronic relay 66 and its indicating lamp 23 or solenoid 24 is closed. In a manner similar to a previous embodiment, the roller 554 driven by a constant speed motor 57 moves the record sheet 40' in timed relation to the notes thereon whereby the music may be played with the proper tempo.

A different embodiment of indicating heads from that previously described may be used as shown by indicating head 112 in FIGS. 13 and 14. In this embodiment an arm 127 drops down onto the key and thereby designates the key to be pushed instead of through use of a lamp as in the previous embodiment. The solenoid 128 which has been connected in a manner shown in FIG. 2 is controlled by a contact 52 in the reading head and upon the circuit being closed by the particular contact 52 connected to that solenoid 128, the arm 127 has its back portion drawn to the solenoid 128, thereby causing the arm 127 to pivot on the hinge 129 attached to the arm 127 and to the housing 122 and to drop down onto the key against the force of the compression spring 130 attached between the housing 122 and the arm 127. It is possible that some distinctive color may be used on the horizontal portion 131 so that the key to be pressed is clearly brought to the attention of the pupil. Upon opening up the circuit to the solenoid 128 the spring 130 returns the arm 127 into a raised position into the bottom of the housing 122. As with the previous embodiment the housing 122 is mounted on legs 121 which allow it to be placed in a position over the keyboard 14 without any alteration to the keyboard instrument whether it be an organ or a piano or similar type musical instrument.

ln some cases instead of utilizing a reading head as the control means for the indicating head, it has been found preferable when a teacher is available tov allow the teacher to operate the control. means. In such case a teachers keyboard 693 islconnected to indicating` means 12 as is shown in FIG. 15. In this case the teachers keyboard A693 is composed of keys 694 similar in number and position'to those found on the musical instrument being taught. Each of the keys is pivoted at a point 695 with a spring 696 to return it to its normal position of rest after being pressed and released. A microswitch or some sort of push-button switch 697 located below each key 694 is wired so as to operate by closing the circuit to the lamp 23 or solenoid 24 over the similarly placed key on the keyboard 14 of the piano or organ of the pupil. At the same time, either in order to allow the pupil to find the proper keys without looking at the musical instrument keyboard, or in order to allow the instruction to be conducted for more than one pupil, a keyboard panel 698 is also connected so as to have a light 699 operated on the proper key in accordance with the key 694 pressed down on the teacher's keyboard 693 and the switch 697 operated therebeneath. This control means and indicating means should be as portable and interchangeable among similar type musical instruments as the forms previously described and may be used in a similar manner for teaching a pupil.

It will be obvious to those skilled in the art that various changes may be made without departing from the scope of the invention, such as the variations in the reading head of FIG. 1A which is not described in detail. Therefore the invention is not to be considered limited to what is shown in the drawings and described in the specification.

What is claimed is: 1. A teaching device for use with a keyboard instrument having a plurality of keys comprising indicating means to indicate the key of the keyboard instrument to be played; and control means to determine the key of the keyboard instrument to be played, electrically connected to said indicating means; said indicating means including a housing for said indicating means,

indicators in said housing located over each of the plurality of keys, and

support means to support said housing over the keys of the keyboard instrument, attached to said housing;

said indicators in said indicating means each including a bulb situated to concentrate the light from said bulb on a key therebelow,

a solenoid and plunger electrically connected to operate in unison with the lighting of said bulb to operate the key with said plunger.

2. The teaching device of claim l, further characterized by said bulb having lens means to aid the concentration of the light from said bulb on the key below. 3. The teaching device of claim 2, further characterized by said lens means integral with said bulb located between the filament and the key in the end opposite from the socket and filament. 4. The teaching device of claim l, further characterized by record sheet means having openings to pass light therethrough moved in said control means; said control means including guide means to guide the movement of said record sheet means in said control means having a plurality of apertures located transversely of said guide means and the direction of movement of said record sheet means,

a light means located below said apertures,

a plurality of photocells located above said apertures and said record sheet means positioned to receive light through said apertures, and

each of said photocells connected to one of said indicators in said indicating means.

5. The teaching device of claim l, further characterized by said control means including a plurality of contact means, each connected to close the circuit to an indicator upon actuation; and an electronic relay connected between said contact means and said indicator. 6. The teaching device of claim l, further characterized by said control means including a plurality of contact means, each connected to close the circuit to an indicator upon actuation;

said contact means including a contact, and

a common conductor adapted for operative contact with said contact to complete a circuit to said indicating means;

record sheet means moved past said contact means switch means to detect absence of record sheet means electrically connected to said contact means whereby current is shut off in said plurality of contact means upon absence of record sheet means.

9. The teaching device of claim 6, further characterized by said common conductor supported above said contact adapted for operative contact with said contact upon upward movement of said contact,

said record sheet means having raised portions thereon. 10. The teaching device of claim 9, further characterized by said raised portions on said record sheet means having forwardly and rearwardly sloping sides. ll. The teaching device of claim l0, further characterized by said raised portions on said record sheet means having a longitudinal groove connecting said forwardly and rearwardly sloping sides. l2. The teaching device of claim 9, further characterized by a pivot rod passing through each of said contact means, each of said contact means further including an arm attached to said pivot rod for pivotal motion about said rod and having its opposite end connected to said contact for movement of said contact with movement of said arm, and a feeler means on said arm below said pivot rod, between said pivot rod and said opposite end of said arm. 13. The teaching device of claim l, further characterized by said control means including a keyboard having a plurality of keys similarly placed to the keys of the keyboard instrument, pivotal mounting means to pivotally support said keys, spring means connected to said keys, and l switch means operatively located with respect to each of said keys. 14. The teaching device of claim 13, further characterized by an additional indicating means including simulation of the keys of the keyboard instrument,

and

a light on each of said simulated keys electrically connected to said switch means. 15. The teaching device of claim l, further characterized by said control means including a plurality of contact means, each connected to close the circuit to an indicator upon actuation; said contact means including a contact, and

a microswitch actuated by the movement of said contact to complete a circuit to said indicat ing means;

record sheet means having raised portions thereon moved past said contact means to move said contact; and means to move said record sheet means. 16. The teaching device of claim l5, further characterized by t said raised portions each having a longitudinal groove in its top surface to guide said contact means therein.

17. An indicator for a keyboard musical instrument comprising: an elongated housing, means for mounting said housing over said keyboard, a plurality of indicating means, the external surface of which collectively forms the bottom surface of said housing, each of said indicating means including an indicating arm pivotally mounted on said housing, biasing means for holding said arm in a raised, inoperative position, and means for lowering said arm adjacent its respective key, indicating said key by exposing the inner surface of said arm.

Claims (17)

1. A teaching device for use with a keyboard instrument having a plurality of keys comprising indicating means to indicate the key of the keyboard instrument to be played; and control means to determine the key of the keyboard instrument to be played, electrically connected to said indicating means; said indicating means including a housing for said indicating means, indicators in said housing located over each of the plurality of keys, and support means to support said housing over the keys of the keyboard instrument, attached to said housing; said indicators in said indicating means each including a bulb situated to concentrate the light from said bulb on a key therebelow, a solenoid and plunger electrically connected to operate in unison with the lighting of said bulb to operate the key with said plunger.

2. The teaching device of claim 1, further characterized by said bulb having lens means to aid the concentration of the light from said bulb on the key below.

3. The teaching device of claim 2, further characterized by said lens means integral with said bulb located between the filament and the key in the end opposite from the socket and filament.

4. The teaching device of claim 1, further characterized by record sheet means having openings to pass light therethrough moved in said control means; said control means including guide means to guide the movement of said record sheet means in said control means having a plurality of apertures located transversely of said guide means and the direction of movement of said record sheet means, a light means located below said apertures, a plurality of photocells located above said apertures and said record sheet means positioned to receive light through said apertures, and each of said photocells connected to one of said indicators in said indicating means.

5. The teaching device of claim 1, further characterized by said control means including a plurality of contact means, each connected to close the circuit to an indicator upon actuation; and an electronic relay connected between said contact means and said indicator.

6. The teaching device of claim 1, further characterized by said control means including a plurality of contact means, each connected to close the circuit to an indicator upon actuation; said contact means including a contact, and a common conductor adapted for operative contact with said contact to complete a circuit to saiD indicating means; record sheet means moved past said contact means to actuate said contact; and means to move said record sheet means.

7. The teaching device of claim 6, further characterized by said means to move said record sheet means including a pair of opposed rollers positioned to receive said record sheet means therebetween, a constant speed motor attached to one of said rollers for rotation thereof, and spring mounted means to support the other of said rollers in a track means for reciprocal movement of said other roller.

8. The teaching device of claim 6, further characterized by switch means to detect absence of record sheet means electrically connected to said contact means whereby current is shut off in said plurality of contact means upon absence of record sheet means.

9. The teaching device of claim 6, further characterized by said common conductor supported above said contact adapted for operative contact with said contact upon upward movement of said contact, said record sheet means having raised portions thereon.

10. The teaching device of claim 9, further characterized by said raised portions on said record sheet means having forwardly and rearwardly sloping sides.

11. The teaching device of claim 10, further characterized by said raised portions on said record sheet means having a longitudinal groove connecting said forwardly and rearwardly sloping sides.

12. The teaching device of claim 9, further characterized by a pivot rod passing through each of said contact means, each of said contact means further including an arm attached to said pivot rod for pivotal motion about said rod and having its opposite end connected to said contact for movement of said contact with movement of said arm, and a feeler means on said arm below said pivot rod, between said pivot rod and said opposite end of said arm.

13. The teaching device of claim 1, further characterized by said control means including a keyboard having a plurality of keys similarly placed to the keys of the keyboard instrument, pivotal mounting means to pivotally support said keys, spring means connected to said keys, and switch means operatively located with respect to each of said keys.

14. The teaching device of claim 13, further characterized by an additional indicating means including simulation of the keys of the keyboard instrument, and a light on each of said simulated keys electrically connected to said switch means.

15. The teaching device of claim 1, further characterized by said control means including a plurality of contact means, each connected to close the circuit to an indicator upon actuation; said contact means including a contact, and a microswitch actuated by the movement of said contact to complete a circuit to said indicating means; record sheet means having raised portions thereon moved past said contact means to move said contact; and means to move said record sheet means.

16. The teaching device of claim 15, further characterized by said raised portions each having a longitudinal groove in its top surface to guide said contact means therein.

17. An indicator for a keyboard musical instrument comprising: an elongated housing, means for mounting said housing over said keyboard, a plurality of indicating means, the external surface of which collectively forms the bottom surface of said housing, each of said indicating means including an indicating arm pivotally mounted on said housing, biasing means for holding said arm in a raised, inoperative position, and means for lowering said arm adjacent its respective key, indicating said key by exposing the inner surface of said arm.

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