1-6. (canceled)
7. A string-striking device of a piano comprising a long weight lever, one for every key, which is disposed along a length direction of the key at an upper part of the key on the side opposite to a playing side and which is arranged such that one end of the weight lever is fixed to a piano body so as to allow the weight lever to freely swing up and down, and the other open end, which can be vertically displaced, is brought into contact with the upper surface of the key and applies its own weight on the key.
8. The string-striking device of a piano according to claim 7, further comprising a long stopper rail that is secured to the piano body above the weight lever so that the stop rail extends over a plurality of weight levers and restricts the upward swing of the plurality of weight levers.
9. The string-striking device of a piano according to claim 7, further comprising a moving mechanism that moves the weight lever in the length direction of the key.
10. The string-striking device of a piano according to claim 7, further comprising a long lifting rail that is disposed between the weight lever and the key, so that the lifting rail extends over a plurality of keys and is fixed to the piano body in such a manner that, by lifting the weight levers, the lifting rail can displace the weight levers from a normal position, where the levers can touch the keys, to a holding position where the levers are spaced from the keys.
11. The string-striking device of a piano according to claim 10, further comprising a connecting member, one end of which is connected to the lifting rail and the other end extends to an outside of the piano;
wherein the lifting rail can be displaced by operating the other end of the connecting member outside the piano.
12. The string-striking device of a piano according to claim 7, wherein a part at which the weight lever touches the key is constituted by a roller that can roll along the upper surface of the key.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A control apparatus for a fuel cell vehicle comprising:
a propulsion motor capable of driving a vehicle;
a fuel cell, composed of a plurality of fuel cell units formed by sandwiching an electrolyte membrane between a fuel electrode and an oxygen electrode, which generates electric power by supplying a reactant gas to give an electrochemical reaction;
a capacitor which is charged by a generated output of said fuel cell and regenerated electric power of said propulsion motor;
a reactant gas supply device which supplies said reactant gases to said fuel cell;
an output control device which receives an output current extracted from said fuel cell and controls said output current of said fuel cell;
a regenerative electric power calculating device which calculates the regenerative electric power which can be generated by regenerative operation of said propulsion motor; and
a chargeable power calculating device which calculates the chargeable power which can be charged to said capacitor,
wherein when said chargeable power is less than said regenerative electric power, said output control device restricts the value of the output current from said fuel cell to zero, and
when said chargeable power is greater than said regenerative electric power, said output control device cancels the restriction on the output current of said fuel cell.
2. A control apparatus of a fuel cell vehicle comprising:
a propulsion motor capable of driving a vehicle;
a fuel cell which generates electric power by supplying a reactant gas to give an electrochemical reaction;
a capacitor which stores generated energy of said fuel cell and performs transfer of electrical energy with said propulsion motor;
a reactant gas supply device which supplies said reactant gas to said fuel cell;
an output control device which controls an output current of said fuel cell;
a regenerative electric power calculating device which calculates the regenerative electric power which can be generated by regenerative operation of said propulsion motor;
a chargeable power calculating device which calculates the chargeable power which can be charged to said capacitor; and
a pressure detection device which detects the pressure of said reactant gas supplied to a fuel electrode of said fuel cell,
wherein, when said chargeable power is less than said regenerative electric power and the pressure of said reactant gas at the fuel electrode of said fuel cell is less than a predetermined pressure, said reactant gas supply device stops supply of said reactant gas to the oxygen electrode of said fuel cell, and said output control device restricts the value of the output current of said fuel cell to substantially zero, and
when where said chargeable power is greater than said regenerative electric power and the pressure of said reactant gas at the fuel electrode of said fuel cell is greater than the predetermined pressure, said output control device cancels the restriction on the output current of said fuel cell.
3. A control apparatus of a fuel cell vehicle according to claim 2, wherein said output control device cancels the restriction ante output current of said fuel cell when said chargeable power is less than said regenerative electric power and the pressure of said reactant gas at the fuel electrode of said fuel cell is greater than a predetermined pressure.