JPH0521113Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a pedal drive device for player pianos, and is particularly easy to install and adjust, has a large degree of freedom in installation, and generates little noise. This has been improved so that it can be driven efficiently.

[Conventional technology]

Generally, this type of player piano includes a key drive device and a pedal drive device. These driving devices usually consist of a well-known electromagnetic plunger consisting of a solenoid and a movable iron core, and by reproducing a pre-recorded electric signal during automatic performance and driving it with the electric signal,
The key is operated as if it were pressed by hand, and the pedal mechanism is operated as if it were pressed by foot.

In this case, in particular, the pedal drive device is disposed coaxially with the middle or lower end of the pedal thrust rod, as disclosed in Utility Model Application Publication No. 56-7990, and is used to directly push up the pedal thrust rod. Or something constructed like this, or another
As seen in Japanese Patent No. 144397, there is known a device in which an electromagnetic plunger is disposed on the inner surface of a musical instrument housing, and its movable iron core and a pedal balance are connected by a connecting shaft.

[Problem that the invention attempts to solve]

However, in the former pedal drive device,
When attaching to an existing piano, the pedal thrusting rod must be cut to create a two-part structure, which makes installation and adjustment work cumbersome, and during automatic performance, only the upper divided pedal thrusting rod can be thrust. The pedal is only raised, but the pedal is not activated, giving a feeling of lacklusterness.

On the other hand, the latter requires a mechanism for adjusting the length of the connecting shaft, which increases the number of parts and makes installation and adjustment laborious. In addition, the contact between the connecting shaft and the pedal balance produces a harsh metallic sound, which has a negative impact on the performance.In addition, since the connecting shaft adds weight, there is little margin for the driving force of the electromagnetic solenoid, and furthermore, continuous operation is difficult. When the pedal generates heat, the driving force decreases further, making it impossible to drive the pedal. Therefore, it is conceivable to use a large electromagnetic solenoid, but in that case, power consumption increases and is uneconomical.

[Means for solving problems]

The pedal drive device for a player piano according to this invention was made to solve the above-mentioned problems, and includes a pedal mechanism consisting of a pedal, a balance, and a lifting rod, and a pedal mechanism arranged on the inner surface of the side plate via a bracket. In the pedal drive device for a player piano comprising an electromagnetic plunger, the electromagnetic plunger has a movable core inserted into a center hole of a solenoid so as to be movable up and down, and a lower end of the movable core is flexibly connected to one end of the balance. They are connected with a wire.

[Effect]

In this invention, the movable iron core and the pedal balance are connected by a wire, so installation and adjustment work is easy, and the degree of freedom in installation is increased. Further, the wire generates less noise during driving, and the wire does not place a large burden on the plunger, allowing the pedal to be driven efficiently.

〔Example〕

This invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a perspective view showing an embodiment of the pedal drive device according to the invention applied to an upright player piano, and FIG. 2 is a front view of the device.
In these figures, the player piano 1 includes a muffler mechanism 3 and a mute mechanism 4 that control the vibrations of the strings 2 at each pitch to reduce the playing volume, and a muffler mechanism 3 and a mute mechanism 4 that release all strings 2 at once to increase the playing volume. a pedal mechanism 6, which is provided with a damper mechanism (not shown) to be connected to the pedal mechanism 6 and which is disposed inside the musical instrument housing 5 in the lower part thereof;
7 and 8, respectively.

The muffler mechanism 3, which is operatively connected to the pedal mechanism 6, has a length that spans all the strings 2 of each pitch, and is made of a muffler felt made of soft and thin felt or the like over almost the entire length. 1
1 is provided with a muffler frame 12 that is hung separately for each of low, medium, and treble sound ranges. The muffler frame 12 is rotatably supported at one end by support shafts 13A and 13B, and is supported by a spring 14.
Since both ends are supported by a pair of side frames 15A and 15B which are biased upward by A and 14B, the muffler felt 11 is normally located at a higher position than the hammer 16, that is, the normal performance position. Installed and maintained. The pedal mechanism 6 includes a muffler pedal 18, a first pedal hanger 19, a link 20, a second pedal hanger 21, a link 22, and a second muffler hanger 23,
The upper end of the second muffler hanger 23 is connected to the side frame 15A via a connecting rod 24. The muffler pedal 18 is disposed on the upper surface of the front end of the bottom plate 25 constituting the musical instrument housing 5.
Its base is pivotably supported vertically by a bracket 26, and its tip protrudes from a pedal window (not shown) in the front base to the lower front of the instrument housing 5. When switching from normal performance to soft performance,
The muffler pedal 18 may be depressed.
Then, each of the above-mentioned connecting members 19, 20, 21,
22 and 23 move or rotate in the direction of the arrow, the side frames 15A and 15B
A, 14B is rotated and lowered to position the muffler felt 11 between the string 2 and the hammer 16,
The normal performance state is then switched to the low tone performance state. In this state, the hammer 16 is the key (not shown)
When driven in conjunction with the key press operation, hammer 1
6 strikes the strings 2 through the muffler felt 11, the striking force of the hammer 16 is weakened and a soft tone is played.

The weak sound mechanism 4 is constituted by a hammer rail 17 that extends along the direction in which the strings 2 are arranged side by side and locks all the hammers 16 at the initial position,
By moving this hammer rail 17 in the direction of the string 2 using the pedal mechanism 7, the gap between the string 2 and the hammer rail 17, in other words, the flying distance of the hammer 16 is shortened, and the striking force of the hammer 16 is weakened, allowing for soft playing. I try to do it. The pedal mechanism 7
is composed of a soft pedal 27, a connecting rod 28, a soft pedal balance 29, a soft pedal lifting rod 30, etc., and this lifting rod 30 is connected to the hammer rail 1.
7 via a suitable connecting member (not shown). The soft pedal 27 is disposed on the left side of the muffler pedal 18, and its tip protrudes from the front lower part of the instrument housing 5. When the pedal 27 is depressed, the soft pedal protrusion rod 30 is activated. The soft pedal balance 29 is pushed up as the soft pedal balance 29 swings, and is configured to move the hammer rail 17 toward the string 2 side.

A damper pedal 32 constituting the pedal mechanism 8 is disposed on the right side of the muffler pedal 18. Like the soft pedal 27, this damper pedal 32 is operatively connected to a well-known damper mechanism (not shown) via a connecting rod 33, a damper pedal balance 34, and a damper pedal thrust rod 35. Then, when the damper pedal 32 is depressed, the damper mechanism moves away from each string 2 at the same time as the damper pedal thrust rod 35 moves upward, releasing all the strings 2, and striking the strings 2 in this state. This causes the vibration to continue and other strings to resonate. Therefore, the performance sound is increased.

The soft pedal balance 29 and the damper pedal balance 34 of the pedal mechanisms 7 and 8 are supported at their middle parts by pedal balance shafts 40 and 41, respectively, so as to be able to swing vertically, and by springs 42 and 43. The soft pedal 27 and the damper pedal 32 are given a return habit by being given the counterclockwise rotation habit as shown in FIG.

Now, inside the musical instrument housing 5, the pedal mechanisms 7 and 8 are selectively mounted on the inner surface of the left side plate 45 that closely opposes the pedal thrust rod 30 and the damper pedal thrust rod 35 during automatic performance. A pedal drive device 10 is disposed via a substantially T-shaped bracket 46, which is driven simultaneously or simultaneously to control the damper mechanism 4 and the damper mechanism described above. The pedal drive device 10 includes a pair of electromagnetic plungers 48 and 49 attached to the front and back surfaces of the bracket 46, respectively. The electromagnetic plunger 48 attached to the surface side of the bracket 46 connects the solenoid 48A and the solenoid 4.
A flexible wire 5 connects a movable core 48B vertically movably inserted into the center hole of 8A, and a lower end of the movable core 48B to the left end of the soft pedal balance 29.
0, etc., and is responsible for driving the pedal mechanism 7. Similarly, the electromagnetic plunger 49 attached to the back side of the bracket 46 also has a solenoid 49A and a movable core 49B.
The pedal mechanism 8 is driven by the flexible wire 52 that connects the lower end of the movable iron core 49B and the left end of the damper pedal balance 34.

The bracket 46 is fixed to the inner surface of the side plate 45 by a longitudinally elongated hole (not shown) and a set screw 53 so that its height can be adjusted. The reason why the electromagnetic plungers 48 and 49 are arranged on the front and back surfaces of the bracket 46 is to take into consideration the misalignment between the soft pedal take-up 29 and the damper pedal take-up 34 in the front-rear direction. It can be arranged almost vertically.

In the pedal drive device 10 having such a configuration, when a voltage pulse is applied to the solenoid 48A to drive the electromagnetic plunger 48, the movable iron core 48B is momentarily attracted and raised, thereby pulling the wire 50. As a result, the soft pedal take-up lever 29 rotates clockwise in FIG. 1 against the spring 42 with the pedal take-up shaft 40 as a pivot point, and at the same time as the soft pedal 27 is actuated, the soft pedal uplift bar 30 is pushed up. As a result, the damping mechanism 4 is operated in the same manner as when the soft pedal 27 is depressed by the foot.

On the other hand, when the electromagnetic plunger 49 is driven by applying a voltage pulse, the wire 52 is pulled as the movable core 49B moves upward. Therefore,
The damper pedal take-up lever 34 rotates clockwise in FIG. 1 against the spring 43 using the pedal take-up shaft 41 as a rotation fulcrum, and at the same time as the damper pedal 32 is operated, the damper pedal uplift bar 35 is pushed up and the damper pedal is raised. The mechanism is operated in the same manner as when the damper pedal 32 is depressed.

Thus, according to such a pedal drive device 10, there is no need to add any processing to the pedal mechanisms 7, 8 themselves, and one end of the wires 50, 52 can be connected to the pedal balances 29, 34, respectively, so that the installation and
Adjustment work is extremely simple and easy, and the soft pedal 27 and damper pedal 32 can be operated reliably during automatic performance. Further, since the wires 50 and 52 are used, there is a large degree of freedom in the mounting positions of the electromagnetic plungers 48 and 49, and the generation of noise can be significantly reduced. Furthermore, the wires 50, 52 are sufficiently lighter than conventional rigid connecting rods and do not place a large weight load on the electromagnetic plungers 48, 49, resulting in less loss of driving force and allowing the pedals 27, 32 to move smoothly. Can be driven.

Note that when the pedals 27 and 32 are depressed during normal performance, the wire 5 is
Since the pedals 0 and 52 are slack, the pedal drive device 10 itself is not operated by pedal operation, and the pedal mechanisms 7 and 8 can be operated smoothly in the same way as in a general piano. In addition, the backup spring 53
If the movable iron core 48B (same as 49B) is urged upward, the movable iron core 48B can be pulled up smoothly and quickly when the electromagnetic plunger 48 starts driving.

[Effect of idea]

As explained above, in the player piano pedal drive device according to this invention, the movable core of the electromagnetic plunger and the pedal balance of the pedal mechanism are connected by a flexible wire, so there is a high degree of freedom in attaching the electromagnetic plunger. The pedal mechanism itself does not require any modification, and can be easily installed on existing products. In addition, the wire not only generates less noise due to interference with the pedal balance, but also
Since it does not impose a large weight load, there is little loss of driving force, and the pedals can be driven efficiently.
Furthermore, during normal performance, the pedal mechanism can be driven independently of the pedal drive device, and during automatic performance, the pedals can be operated in the same way as during normal performance, which has very great practical effects.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the pedal drive device according to the invention applied to an upright player piano, and FIG. 2 is a front view of the device. 2...Strings, 3...Muffler mechanism, 4...Weak sound mechanism, 5...Musical instrument housing, 6, 7, 8...Pedal mechanism, 10...Pedal drive device, 18...Muffler pedal, 27... Soft pedal, 29... Soft pedal balance, 32... Damper pedal, 34...
Damper pedal balance, 45... Side plate, 46... Bracket, 48, 49... Electromagnetic plunger, 48
A, 49A... Solenoid, 48B, 49B...
Movable iron core, 50, 52...wire.

Claims (1)

[Scope of claim for utility model registration] Pedals 27, 32, balances 29, 34, thrust bar 3
Pedal mechanism 7, 8 consisting of 0,35 and side plate 45
In a pedal drive device for a player piano comprising electromagnetic plungers 48, 49 disposed on the inner surface via a bracket 46, the electromagnetic plungers 48, 49 are vertically movable in the center holes of the solenoids 48A, 49A. A pedal drive device for a player piano, comprising inserted movable iron cores 48B, 49B, and the lower ends of the movable iron cores 48B, 49B are connected to one ends of the balances 29, 34 by flexible wires 50, 52.