Yamaha G10C Manual de usuario descargar pdf (Pagina 5)

EP 0 585 798 B1

assembly

3 after the

escape

of the

jack

2d when the

key

depressed slowly, as

will be described hereinlater.

Turning

back

Fig.

the hammer

assembly

comprises a

hammer shank 3a

implanted

into the butt

2i and

hammer head 3b

supported by

the hammer

shank 3a. While the

key

staying

in the

rest

position,

the hammer head 3b is

spaced

apart

from the

string

However,

the hammer head 3b strikes the

string

when

the

key

action mechanism 2 is driven

the

key

1a.

The

string

usually

consists of three music

wires,

and vibrate for

producing a

sound with the

note

assigned

the associated

key

upon

strike with the hammer

head 3b.

The

damper assembly

comprises a damper

lever

flange

fixed

the

center

rail

a damper

lever 5b

rotatably supported by

the

damper

lever

flange

5a,

damper

wire

projecting

from the

damper

lever

5b,

and

a damper

head 5d fixed

the

leading

end of the

damper

wire

5c,

and

a damper spring

urges

the

damper

lever

5b in the

counter

clockwise direction.

While the

key

staying

in the

rest

position,

the

damper

spoon

2f is

spaced

apart

from the lower end

por-

tion of the

damper

lever

5b,

and the

damper

head 5d is

pressed against

the

string

However,

if the

damper

spoon

2f declines toward the left side due

the

key

depressed by

the

player,

the

damper

spoon

brought

into

contact

with the lower end

portion

of the

damper

lever 5b

the

predetermined point,

and, then,

the

damper

lever 5b is driven for rotation in the clockwise

direction,

and leaves the

damper

head 5d from the

string

After the

key

released,

the

damper assembly

returns to

the initial

position,

and the

damper

head 5d

takes

the vibrations of the

string

Though

not

shown

in the

drawings,

the

upright piano according

the

present

invention is

equipped

with

pedal

mechanisms,

and

one

of the

pedal

mechanisms is

provided

asso-

ciation with the

damper assembly

for

holding

off the

damper

head 5d.

Description

is hereinbelow made

on sequential mo-

tions of the

upright piano. Assuming now

that

a player

depresses

the

key

1a,

the

pair

capstan

buttons 1d is

upwardly

moved,

and

pushes

the

whippen/ whippen

heel

assembly

upwardly,

and the

whippen/ whippen

heel

assembly

2a is driven for rotation in the

counter

clockwise direction around the

whippen flange

2b. In the

counter

clockwise

rotation,

the

jack

2d and the back

check

2g are upwardly

moved from the initial

position

together

with the

whippen/ whippen

heel

assembly

2a,

and the

damper

spoon

2f declines toward the left side.

The

damper

spoon

2f thus

declining on

the left side

brought

into

contact

with the lower end

portion

of the

damper

lever 5b

the

predetermined point

and

rotates

the

damper

lever 5b in the clockwise direction around

the

damper flange

5a,

and the

damper

head 5d is left

from the

string

result,

the

string

ready

for

free vibrations.

The

jack pushes

the butt 2i until the

toe

of the

jack

2d is

brought

into

contact

with the

regulating

button

2m,

and

rotates

the butt 2i in the

counter

clockwise direction.

While the

jack

upwardly pushes

the butt

2i,

the butt

cloth 2v is

spaced

from the

regulating screw

2u.

However,

when the

toe

of the

jack

2d is

brought

into

contact

with the

regulating

button

2m,

the

jack

rotates

around the

jack flange

2c in the clockwise direction

against

the elastic force of the

jack spring

2e,

and the

jack spring

2e is

resiliently

deformed. The

jack

2d is fi-

nally escaped

from the butt

2i,

and the butt 2i is kicked

the

jack

2d. The butt 2i thus kicked is driven for

rota-

tion in the

counter

clockwise

direction,

and the hammer

assembly

rushes toward the

string

The hammer head

3b strikes the

string

and the

string

vibrates for

pro-

ducing a

sound with the

note

assigned

the

depressed

key

1a.

On the other

hand,

the

spring

keeps

the head of

the

regulating screw 2y

contact

with the

jack

cloth 2z.

Therefore,

the

jack escaped

from the butt

urges

the

reg-

ulating screw 2y

and,

accordingly,

the

repetition

lever

to rotate

against

the elastic force of the

spring

2u in

the

counter

clockwise direction without

any

contact

with

the back check

felt,

and the

repetition

lever

reaches

certain

position over

the back check felt

shown in

Fig.

3. A

gap

G takes

place

between the

top

surface of

the back check felt and the

semi-spherical portion

of the

repetition

lever

2q.

Even if the

player softly depresses

the

key

1a,

the

hammer head 3b rebounds

the

string

and is

never

pressed against

the

string

In other

words,

the hammer

head 3b

never

terminates

a pianissimo

sound. Because

the hammer

assembly

can

rotate

in the clockwise di-

rection due

the

gap

after the hammer head 3b

strikes the

strings

after the

escape

of the

jack

in the

adjusting

the

regulating

button 2m.

The hammer head 3b rebounds

the

string

and

the butt

spring

urges

the butt 2i

to rotate

in the clock-

wise

direction,

and the

semi-spherical portion

of the

rep-

etition lever

brought

into

contact

with the

top

of the

back check felt of the back check

before the

contact

of the catcher skin 2o with the back check felt. Since the

butt 2i

and,

accordingly,

the hammer

assembly

con-

tinues

to rotate

in the clockwise direction until it is

checked

the back check

2g,

the

repetition

lever

further

rotates

in the

counter

clockwise direction around

the

2r.

After the

contact

of the

semi-spherical portion

of the

repetition

lever

with the

top

of the back check

felt,

the catcher skin 2o is

brought

into

contact

with the left

side surface of the back check

felt,

and the head of the

regulating screw 2y

is left from the

jack

cloth 2z. The

key

action mechanism 2

enters

a suspended

state

shown in

Figs.

and

However,

the catcher 2n

never

widely

rebounds

the

backcheckfelt,

because the im-

pact

the hammer rebound is taken

through

the

ro-

tation of the

repetition

lever

in the

counter

clockwise

direction. The

spring

2t accumulates

part

of the inertia

in the form of resilient force.

Therefore,

the hammer

head 3b

never

strikes the

string

again.

1 2 3 4 5 6 7 8 9 10 ... 19 20

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

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