Yamaha G10C Bedienungsanleitung PDF herunterladen (Seite 6)

EP 0 585 798 B1

In order

prevent

the

string

from

double-strike,

it is

important

regulate

the

gap

an appropriate

value for

allowing

the hammer

assembly

to rotate

over

the

predetermined angle

in the clockwise direction after

striking

the

string

even

if the

key

depressed

slow-

before the

contact

between the catcher skin 2o and

the back check felt.

It is also

important

adjust

the distance between

the head of the

regulating screw

2u and the butt cloth

an appropriate

value when the

key

action mecha-

nism

enters

the

suspended state,

because it determines

the

playing

characteristics,

for

example, prevention

restriking or repetition

characteristics. When the dis-

tance

too

short,

the

impact

the butt

rebounding

from

the

strings

can

not

be taken

up.

Therefore,

the ham-

mer

head 3b is liable

restrike the

string

On the other

hand,

when the distance is

too

long,

the

impact

is taken

completely,

but the rotation

range

of the

repetition

lever

in the

counter

clockwise direction is

so large

that the

response

characteristics

the

quick fingering

not

improved.

When the

key

action mechanism 2

enters

the

sus-

pended state,

the

key

have

already

reached the end

position.

If the

player slightly

lifts the

key

1a,

the

whip-

pen/ whippen

heel

assembly

slightly

rotates

in the

clockwise direction around the

whippen flange

2b, and,

accordingly,

the back check

rotates

in the clockwise

direction. As

result,

the back check felt is left from the

catcher skin 2o.

The release of the catcher from the back check due

the rotation of the

whippen/ whippen

heel

assembly

2d in the clockwise direction allows the

repetition

lever

to rotate

around the

pin 2p

in the clockwise direction

due

the elastic force of the

spring

so as

continue

be held in

contact

with the back check

felt,

and the

reaction

the rotation of the

repetition

lever

rotates

the

flange 2p

and,

accordingly,

the butt 2i in the

counter

clockwise direction. When the head of the

regulating

screw 2y

brought

into

contact

with the

jack

cloth

2z,

the

repetition

lever

and the butt 2i become

stationary,

because the

regulating

button 2m

sets

limit

the

jack

2d.

While the

player

is further

lifting

the

key

1a,

the

whippen/ whippen

heel

assembly

2a is also

rotating

the clockwise direction around the

whippen flange

2b,

and the back check

is also

rotating together

with the

whippen/ whippen

heel

assembly

2a. This motion of the

back check felt is

equivalent

a sliding

motion of the

repetition

lever

in the leftward direction with

respect

the back check

felt,

because the rotation of the back

check

larger

in the horizontal

component

than the

vertical

component.

The

repetition

lever

is held in

contact

with the back check felt

the

semi-spherical

portion,

and the

sliding

motion is smooth.

Therefore,

the

hammer

assembly

rotates

little in the clockwise direc-

tion.

When the

key

is lifted from the end

position by a

predetermined

distance,

the

toe

of the

jack

2d is

spaced

apart

from the

regulating

button 2m

through

the rotation

of the

whippen/ whippen

heel

assembly

2a in the clock-

wise

direction, and, then,

the

jack spring

fully ex-

pands.

Then,

the

jack

rapidly

turns

in the

counter

clockwise direction around the

jack flange

2c,

and

re-

turns

beneath the butt skin

2j,

because the

semi-spher-

ical

portion

of the

repetition

lever

is held in

contact

with the back check felt

that

return

of the hammer

assembly

and,

accordingly,

the butt 2i is

delayed.

Thus,

before the butt 2i

returns to

the initial

position

shown in

Figs.

and

the

jack

2d is

brought

into

contact

with the butt skin

2o,

and the

key

action mechanism 2

enters

ready

for

response

a key redepressing.

As-

suming now

that the

upright piano implementing

the

present

invention is the

same

size

as an ordinary upright

piano,

the

key

action mechanism 2

enters

the

ready

for

response

a key depressing

when the

key

is lifted

from the end

position by

less than 3 millimeters. This

means

that the

key

action mechanism 2 is

responsive

a quick repetition or a quick fingering.

Assuming now

that the

player softly depresses

the

key

the

key

action mechanism 2 is

responsive

the

key depressing,

and the hammer head 3b strikes the

string

described hereinbefore.

However,

the

driving

force exerted

the butt 2i

by rebounding on

the

string

small that the reaction

the hammer

assembly

can

not

exceed the elastic force of the

spring

2t. In this

situation,

the

key

action mechanism 2

enters

the

sus-

pended

state

when the

repetition

lever

brought

into

contact

with the

upper

surface of the back check

felt,

and the catcher skin 2o

never

contacts

with the back

check felt.

Though

the catcher 2o is

never caught by

the

back check

due

the weak

reaction,

the hammer

assembly

does

not

strike the

string

again,

because the

butt

spring

urges

the butt 2i in the clockwise

direction,

the back checkfelt takes

the

impact

and the

repetition

lever

rotatably supported by

the butt 2i.

As will be

appreciated

from the

foregoing descrip-

tion,

the

key

action mechanism 2

according

the

present

invention is

responsive

a quick

and

strong

repetition,

because the

jack

returns

beneath the butt

skin

before the

key

reaches the

rest

position.

The

key

action mechanism 2 does

not

press

the

hammer head 3b

against

the

string

even

if the

player

softly depresses

the

key

1a,

because the

gap

pro-

duced between the

semi-spherical portion

of the

repe-

tition lever

and the back check felt when the

jack

escaped

from the butt 2i but before the hammer

as-

sembly

rotates

in the clockwise direction.

Therefore,

the butt 2i

and,

accordingly,

the hammer

assembly

can

rotate

voer

the

predetermined angle

in the clockwise di-

rection due

the

gap

after the

escape

of the

jack

2d.

The

key

action mechanism 2

never

allows the ham-

mer

head 3b

strike the

string

twice

even

if the

player

softly depresses

the

key

because the butt

spring

urges

the butt 2i in the clockwise

direction,

the back

check felt takes

the

impact

and the

repetition

lever

rotatably supported by

the butt 2i.

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EP 0 585 798 B1 12
IP 0 585 798 B1 20

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