WO1980000280A1

WO1980000280A1 - Vorsetzer apparatus

Info

Publication number: WO1980000280A1
Application number: PCT/US1979/000514
Authority: WO
Inventors: V Ramsey; T Wilkes
Original assignee: Teledyne Ind
Priority date: 1978-07-17
Filing date: 1979-07-17
Publication date: 1980-02-21
Also published as: EP0018987A1; CA1122822A

Abstract

A pedal actuator for avoiding the tramped down effect usually associated with solenoid pedal actuation and a connection assembly for connecting the pedal actuator to a piano foot pedal in a secure but non-fixed manner. The pedal actuator includes solenoids (54), dashpot (58), actuating lever (47), and biasing spring (50) which offsets the bias of the conventional piano pedal spring (36). The connection assembly includes a first universal joint (46) connecting the actuating lever (47) to linkage assembly (44), and a second universal joint (42) connecting the lower end of linkage assembly (44) to a foot member (40). Foot member (40) rests on top of the outer end of piano pedal (31) and has a padded portion (40A) located under an inner portion of piano pedal (31) by an offset extension (40L).

Description

VORSETZER APPARATUS BACKROUND AND SUMMARY OF THE INVENTION

The present invention is directed to an electronic vorsetzer pedal foot for converting a conventional piano to an electronic player piano. In the past, a typical vorsetzer was a unit which rested upon the keyboard or some other structure of a conventional piano and act¬ uated the piano keys in accordance with and under the control of a conventional player piano roll. Such units were typically mechanical;) pneumatic, and/or electro¬ mechanical units which had striker elements which, under control of a perforated piano roll, struck or depressed the piano keys to play the tune. With the advent of the electronic player piano units which, instead of using the conventional punched hole player piano roll, use magnetic tape preferably and typically in the form of magnetic tape cassettes. As disclosed in Vincent U.S.

Patent 3,905,267, Englund U.S. Patent 3,604,299, and the above-identified related applications,as well as other related applications of the assignee hereof, the parallel format of the electronic player piano roll, converted to a serial format for the storage of the musical data on the magnetic tape and in time division multiplex frames of data is used to provide control signals to the solenoids of an electromagnetically operated player piano. Other forms of storage' of the data may be used in accordance with the present invention, it not being limited to the type of storage of information, even being applicable to conventional solenoid or electro agnetically operated player piano systems.

In the past, there has been difficulty in securing the pedals to the vorsetzer assembly per se so that the vorsetzer itself can be easily, but not permanently, posi¬ tioned in alignment with the keyboard and connection of the pedals thereto. Frequently, an internal connection is made to the piano pedals by means of an internal linkage.

I-I-REAT

OMPI SN TIO An object and feature of the present invention is that it requires no modification of the conventional pi keyboard nor does is require any structural modificatio of the pedal assembly. In accordance with a preferred embodiment of the present invf-nHnn, th<-> r-πsf-rπn- and so pedals of a typical piano are engaged by a novel mechan foot structure which engages the pedal lever assembly.^' i such a way that it slips on and off easily. In this wa the pedals themselves may be easily captured or engaged

10 with the unit in such a manner that the actuating force, e.g. , from the solenoid assembly (to be more fully desc hereafter) , pushes downward on the rear portion of the causing a light upward force (from the rotational effec on a further portion of the mechanical foot which, pre-

_. _. ferably, is padded, which portion contacts the lower si ofthe pedal, thereby allowing the pedal to be moved dow and upward without the mechanical foot slipping off. M over, by providing a pair of universal' joints, one at t vorsetzer per se and one at the foot, a large range of _ various angles of force application to the piano pedals can be accommodated so precise alignment is not require Moreover, the pedal actuator assembly is set up on the piano in a spring preloaded condition which aids the pe actuating solenoid by offsetting the pedal spring alrea

₂₅ existing in the piano.

As indicated above, in a preferred embodiment of invention, the mechanical foot is driven by a solenoid which is mounted in the vorsetzer unit itself. A sprin in the vorsetzer itself biases the solenoid actuated lev

_₀ in the direction of the actuation and against the sprin that is in the pedals. A damper device such as a dashp is connected to the solenoid actuated lever for impeding rapid movement of the lever. This avoids the highly un desirable boxy sounding effect as if a human player tro

₃₅ hard or thumped his foot on the loud and /or sustain pe and more closely approximates the action of the human foot in playing the soft and sustain pedals of the piano.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, advantages and features of the invention will become more apparent from the follow¬ ing specification when taken in conjunction with the accom¬ panying drawings wherein: , FIG. 1 is an isometric perspective view of a piano having the electronic vorsetser of the present invention positioned thereon,

FIG. 2 is a schematic diagram illustrating the pedal actuator assembly as set up on the piano in a spring "pre- loaded condition" which aids the pedal actuating solenoid by offsetting the pedal spring already existing in the piano; FIG. 2 alsodiagrammatically illustates the position of the damper of dashpot in relation to the added spring for preventing the tromped down sound effect if the sole- noid were permitted to operate the linkage without the modifying effect of the dashpot,

FIG. 3 illustrates a side view of the invention, FIG. 4 is a top plan view of the part shown in FIG. 3, and FIG. 5 is a front elevational view of the "foot" of the actuator assemblies.

GENERAL DESCRIPTION

Since the present invention is concerned primarily with the driving assemblies and method for actuating the foot pedals (sustain and soft) of a conventional piano, details of the solenoid actuators for the keyboard as well as the tape unit and electronic circuitry therefor are described in general by reference to the electronic player

OMPI _κ ^" ΪPCT

--T ATl piano manufactured and sold by the assignee hereof, Tele Industries, Inc., and are disclosed in detail in the aforementioned patent applications. Moreover, since the present invention is concerned soley with the playback function or operation, the record assembly is not con¬ sidered relevant hereto. Moreover, since the unit is mo in the fashion of conventional vorsetzer, e.g., over the keyboard, the mountingrack for the solenoid assemblies is mounted in a housing which .is generally to be positoned directly over the piano keyboard. Such mounting structu per se fqrm no part of the present invention. The playb essembly includes a playback logic board, driver boards and key solenoids, and a pedal solenoid assembly. In addi a conventional magnetic cassette playback unit reads the magnetic tape and the musical note data stored thereon a converts same to actuating signals for the solenoids. T bass and treble expression information is decoded and us to control the intensity or expression effects on both t bass and treble sides of the piano keyboard. Moreover, the pedal control signals as derived from the tape playe are used to drivecontrol signals for the pedal driver so noids.

While pianos having only soft and sustain pedals known, and the invention is shown as applied to such a p it will be appreciated that the vast majority of pianos have the sustain and soft pedals as well as a bass pedal but in the preferred embodiment of the present invention only the sustaining and soft pedals are driven a phanto or dotted position for the bass pedal is shown in Fig. 1 of the drawings with the soft pedal being on the left, t sustain pedal on the right and the bass pedal in the cen

Referring generally to Fig. 1, a partial isometri view of a piano 10 is illustrated with a cantilevered support 11 for the piano keyboard 12. It will be apprec that in many difference types of pianos a leg or pedesta under cantilever support 11 can be provided. Piano 10 is illustrated as resting on a floor 13 and positioned on the piano is the vorsetzer 14 itself. Vorsetzer 14 has an upper unit 16 and a lower unit 17 which supports upper unit 16 on a pair of vertical posts or pedestals 18 and 19, respectively, there being more or less pedestals as needed for structural stability. The bank of key solenoids, 38 if there were to be 88 keys of the piano actuated, but in a typical and preferred embodiment the four keys on the end are not played and hence only 80 keys are played, are carried on a frame (not shown) in upper unit 16. This provides _^additional room proximate the ends of the unit^' to ^• fit the vorsetzer over the keyboard 12 without difficulty for any type of piano Since the spaces between the piano keys are standard. The key solenoids and their actuating plungers which project downwardly towards the keyboard are aligned over the keys of the keyboard 12. Lower unit 17 carries the electronic circuitry as well as the tape play¬ back unit (instead of a magnetic tape cassette other forms of record could be used, e.g., perforated rolls,discs, etc.) which may be positioned in a drawer in the front side of lower unit 17 or in a receptacle in the upper surface of lower uinit 17. Lower unit 17 is supported by four legs 20, each of which is provided with casters 21 so that the vorsetzer may be easily rolled up to the piano for attach- ment thereto. The only physical connection to the piano per se is in connection with the soft and sustain pedals, and in the preferred embodiment, this engagement or con¬ nection is not a positive connection for purposes to be described more fully hereinafter.

SOLENOID-DASHPOT DRIVE ASSEMBLY

Soft and sustain pedals 30, 31, respectively, have identical solenoid-dashpot and linkage mechanisms and only one will be described, it being understood that the inven¬ tion is applicable to both the soft and sustain pedals with the drive being shown in FIG. 2 being a right-hand *view of the sustain pedal assembly. As there illustrated, th sustain pedal 31 is on a lever 32 which is pivoted as a 33 on a portion of the piano frame (not shown) . Lever 3 is connected through an actuating connection 34 to the sustain mechanism of the piano (not shown) in a conventi al fashion. In addition, a spring 36 is illustrated dia- grammically between the end of lever 32 and a further fixed portionof the frame 37 and the end of lever 32 bia the lever in an up position so that as in normal operati the pianist's foot on lever 31 is reguired to push lever 31 down (counterclockwise about pivot 33) in order to pu rod 34 up to actuate the sustain mechanism of the piano. Mechanical foot 40 which is described in greater detail hereinafter, engages sustain pedal 31 and is desig to permit the sustain pedal to be captured easily such t the actuating force pushing downwardly on the rear porti of the foot (the outward end of pedal 31) causes a slxg upward force from the rotational effect about the ball joint 42 on the lower padded extension 43 which contacts the lower or under-side of pedal 31, thereby allowing the piano pedal to be moved downward and upward without the foot slipping off. At the same time, the foot may b disengaged from the pedal quite easily since there is no positive securement of the foot to the pedal. The outer end of foot 40 has a ball joint 42, the ball being rigid and an elongated connecting member or linkage assembly 4 to upper ball joint 46. The ball and socket of ball joi 42 and 46 can obviously be reversed with the ball 42b on ⁼ foot 40 and socket 42s on the lower end of linkage 44.

Ball joint 46 has a ball 46b and socket 46s on the upper end of linkage 44.

Upper ball 46b connects the linkage assembly 44 w an actuating lever 47 in lower unit 17. Linkage assembl 44 has an upper rod portion 44a adjustably connected to lower rod portion 44L by threaded screw adjustment membe 44s on the end of upper rod 44u. A lock nut 44n main¬ tains linkage 44 at its adjusted length. Lever 47 is pivoted on pin 48 on a yoke or saddle 49, the position of pin 48 in lever 47 being selected in one of hole 47h. A spring 50, on spring stud 50s, between a portion of the frame 51 on lower unit 17, biases or urges lever 47 to rotate in a counterclockwise direction about pivot pin 48 which thereby urges linkage assembly 44down¬ ward to maintain foot 40 in engagement with pedal 31. The force of spring 50 is therefore adapted to aid the piano pedal actuating solenoid by offsetting the effect of pedal spring 36 (FIG. 2). Lever 47 extends to the right of spring 50 and has connected thereto the armature 53 of a solenoid pair 54-1 and 54-2 which receive control signals from solenoid driver SD (FIG. 2) and the tape unit as described earlier. The armatures 53 of dashpot pairs 54-1 and 54-2 are connected to a common device 53c which is pivotally connected to link 55 which, in turn, is pivotally connected to lever 47. Iⁿ addition, there is provided an adjustable damper or dashpot 58 connected by a dashpot plunger 59 to dashpot mounting bracket 48. Dashpot 58 is pivotally secured between the extended right end 47 RE of lever 47 and bracket 48. Dashpot 58 has an adjustable screw orifice 60 so as to permit the damping force of dashpot 58 to be adjusted easily. This system of the spring 50 acting always to push down on linkage assembly 44 and thus main¬ tain the pedal foot in operative engagement with pedal 31 and also to offset the pedal spring 36 existing in the piano, cooperatively acts with the damper or dashpot 58 so that when the electrical energy is applied suddenly to solenoid coil 54, armature 53 is rapidly drawn upwardly to thereby move lever arm 47 in a counterclockwise direc¬ tion. However, the damper 58 has the overall effect of avoiding a box-like thumping sound as if one suddenly tromped his foot upon a pedal. Upon the de-energization

'BUREA OMPI ^ WIPO ^NATlO- of solenoid coil 54, spring 36 biases the operating lev 32 of pedal 31 in a clockwise direction thereby moving linkage assembly 44 in a upward direction and turning lever 47 in a clockwise direction thereby maintaining t preloading condition to thereby aid the pedal actuating solenoids 54.

Thus, the objects, advantages and features of th invention as set forth in this specification and the drawings is achieved in a simple, inexpensive and exped tious fashion. The vorsetzer can easily be positioned alignment with keyboard and the mechnical feet easily positioned on the foot pedals. Spring 50 in the linkag mechanism just offsets the spring 36 in the internal mechanism of the foot pedals so that the lost motion is eliminated between the mechanical foot and the foot pedal, and dashpot 58 exerts a moderating effect on the solenoid drive of the linkage, this moderating effect being adjustable to accommodate all types of piano mechanisms.

While there has been disclosed and described a preferred embodiment of the invention, it will be appre ated that various modifications, adaptations and uses o the invention will be apparent to those skilled in the art and coming within the spirit and scope of the inven as defined in the claims concluding this specification.

What is claimed is:

Claims

E CLAIM:

1. In an electronic vorsetzer having a solenoid actuator for driving the keys and foot pedals of a piano and a linkage connecting the foot pedal of the piano to the solenoid actuations thereof, the improvement comprising in combination: a mechanical foot member for engagement with the foot pedal of said piano, said foot member having an upper and lower pedal engaging surfaces having interconnecting means some in horizontally spaced relation such that any actuating force transmitted downwardly by said linkage pushes downwardly on said upper pedal engagingsurface and said foot pedal swinging said foot member to cause said lower pedal engaging surface to engage the under surface of said foot pedal whereby said foot pedal can be moved upwardly and downwardly without said mechanical foot member slipping off said pedal, spring means for biasing said linkage in a direction to just begin to counter the action of the spring bias on said pedal, and a constricted fluid passage means for moderating the effect of solenoid action on said linkage, and means for adjusting the constriction in said constricted fluid passage.