JPH0752343B2 - Key press detection device - Google Patents

Description

The present invention relates to a key-depression detection device, which is provided with a plurality of sensors for detecting the swinging state of each key as a unit and arranged below the key to improve the detection accuracy. is there.

[Prior Art] As a conventional key press detecting device for an automatic playing piano, for example, one disclosed in Japanese Utility Model Laid-Open No. 58-175585 is known.

In this device, a plurality of sensors for detecting the movement of each solenoid are arranged in a common yoke in which a plurality of solenoids (actuators) are arranged. Further, the common yoke is installed above the keyboard. Therefore, each solenoid depresses each key. These sensors contact the rear end of the plunger of each solenoid to detect the movement of the key.

[Problems to be Solved by the Invention] However, in such a conventional key-depression detecting device for an automatic playing piano, the sensor is in contact with the plunger of the solenoid, and the key movement is directly detected. Due to the non-trivial configuration, the accuracy of detecting the movement of the key tends to be insufficient. Therefore, the mounting position of the sensor had to be corrected for each key. In addition, the sensor has to be integrally arranged on a common yoke that is a supporting member of the solenoid,
It was not possible to make it compact, and the installation position in the piano was restricted. In addition, it was inconvenient to adjust the installation at that time.

Therefore, the present invention has high detection accuracy, easy standardization,
Another object of the present invention is to obtain a key press detecting device which has a simple structure, is easy to assemble and adjust, and is compact so that it can be arranged in front of a key.

[Means for Solving the Problems] Therefore, the present invention provides a plurality of detecting means for detecting the movements of a plurality of keys swingably supported on the shelf board with the reed of the keyboard reed as a fulcrum. In a key-depression detecting device provided with the key, a base member disposed below the respective keys and arranged to be adjustable in position in the longitudinal direction of the key on a shelf plate between the reed and the front of the reed, and the base member. A mount member supported by a member, wherein both ends of the mount member are independently supported by the base member so that the height of each mount member can be adjusted independently. A key detection device is provided.

[Operation] In the key-depression detecting device according to the present invention, since the detecting means for detecting the movement of each key is attached to the mount member, the height of the detecting means can be uniformly adjusted for each key. There is. Further, since the mount member is supported by the base member, the position of the detecting means can be uniformly adjusted in the longitudinal direction of the key by the base member. As a result, as a whole, the detection means can be uniformly adjusted and arranged at an appropriate position with respect to the key, and the detection accuracy can be improved.

Further, since the heights of both ends of the mount member can be adjusted independently, the inclination of the detection means can be adjusted.

Further, since the detecting means is arranged on the mount member and the base member independently of the actuator, it can be made compact. Further, since the base member is arranged on the shelf board, the assembling adjustment becomes easy.

[Embodiment] An embodiment of a key-depression detecting device according to the present invention will be described below with reference to the drawings.

First Embodiment FIGS. 1 to 8 show a first embodiment of a key-depression detecting device for an automatically playing piano according to the present invention.

FIG. 1 is a vertical cross-sectional view showing the overall configuration of a key-depression detecting device for an automatic playing piano according to the first embodiment. FIG. 2 is an exploded perspective view showing a main part of a key press detecting device of an automatic playing piano. FIG. 3 is a side view showing the main part of the key depression detecting device. FIG. 4 is a plan view showing the base member. FIG. 5 is a plan view showing the mount member. FIG. 6 is a front view showing the mount member. FIG. 7 is a plan view showing a photo interrupter. FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.

In these figures, 11 is a piano shelf. A key 13 is supported on the shelf board 11 so as to be vertically movable. That is, the key 13 is provided so as to be vertically movable around the reed 15 (balance key pin 17) of the keyboard reed as a fulcrum. In addition, 19 indicates the reed of the keyboard reed, and 21 indicates the same after the reed.

In this case, the key 13 is placed between the reed front 19 and the reed center 15 of the keyboard reed.
A flat space is defined below and above the shelf plate 11. A key drive unit 23 extending along the key arrangement direction is arranged in this space.

A sensor unit (including detection means) 25 is arranged in the space on the front side of the key drive unit 23.

The key drive unit 23 has a plurality of electromagnetic actuators 27 provided corresponding to the respective keys 13.
That is, the key drive unit 23 includes a common U-shaped yoke 29, and an electromagnetic actuator 27 (an ordinary one having a plunger and a solenoid coil) held and erected between the upper and lower pieces of the yoke 29. Actuator),
have.

The position of the yoke 29 can be adjusted in the longitudinal direction (front-rear direction) of the key 13 by the elongated hole 33 and the screw 35 in the fixed base 31. Reference numeral 37 is a spacer inserted on the fixed base 31.

The electromagnetic actuators 27 are arranged in a staggered pattern as shown in FIG. And these electromagnetic actuators
Plunger heads 27 project from the yoke upper piece 29 and are in contact with one end of the lever 39 from below.

These levers 39 are provided below the keys 13 and swingably in a vertical plane corresponding to the actuators 27.
Each lever 39 is formed of a thin leaf spring, and is swingably supported by a flange 41 fixed to the yoke 29. Also,
The other end (front end) of the lever 39 is formed in a fork (39A) shape.

Here, a hook 43 is provided so as to protrude downward on the lower surface of the front end portion of the key 13. The hook 43 has upper and lower horizontal pieces 45 and 47, and the fork 39A is inserted and engaged between the horizontal pieces 45 and 47. That is, when the lever 39 swings to lower the fork 39A at the other end, the horizontal piece 47 is pushed down and the key 13 is pulled down. Further, on the hook 43, a shutter 49 is projected and hung from the lower surface of the horizontal piece 47.

The plate-shaped shutter 49 constitutes a part of the sensor unit 25. The shutter 49 moves up and down in the vertical slits 53 of the sensor body 51, and one light emitting element 55 and two light receiving elements 5 are provided on the inner surfaces of the slits 53 facing each other.
A photo interrupter 61 (detection means) composed of 7 and 59 is provided. In addition, as shown in FIG.
A mask 65 having two vertical grooves 63 is attached to the inner surface of the slit 53 in which 7 and 59 are arranged. Further, the shutter 49 is formed with a predetermined window 67 corresponding to the light receiving elements 57 and 59. Further, the number of light emitting elements corresponding to each light receiving element may be arranged, or a pair of elements may be provided.

The sensor body 51 is held by a rail-shaped mount member 69 that is bent upward to be concave. The mount member 69 extends along the arrangement direction of the keys 13.

Here, the sensor main body 51 shown in FIG. 2 is an example in which a plurality of photo interrupters 61 (detection means) are integrated. But,
As shown in FIGS. 3, 7, and 8, the photo interrupter 61 may be mounted on the mount member 69 for each key 13.

Therefore, one mount member 69 is provided with a number of sensors (photointerrupters 61) corresponding to the number of keys 13.

The mount member 69 is disposed on the base member 71, and the base member 71 is fixed to the shelf board 11 via the member.

Here, the base member 71 is fixed by the screw 75 through the elongated hole 73, and the position of the key 13 can be adjusted in the longitudinal direction. The mount member 69 is attached to the base member 71 by height adjusting screws 77 and 79. The height adjusting screws 77 and 79 are inserted into elongated holes 81 formed in the flange of the mount member 69 and extending in the key arrangement direction. It is attached so that its position can be adjusted in this direction.

Then, springs 83 and 85 are compressed around the outer circumferences of these height adjusting screws 77 and 79. I.e. spring 8
As a result of inserting 3 and 85 between the flange of the mount member 69 and the base member 71, the mount member 69 is elastically supported by the base member 71 in the vertical direction by these springs 83 and 85. Therefore, the mount member 69 can be tilted and held by changing the screwing amount.

7 and 8 show the photo interrupter 61 mounted on the mount member 69. As shown in FIG. 3, each of the photo interrupters 61 is fixed on a long board 87 extending in the key arrangement direction. Note that 89
Is a substrate holder.

In these figures, 91 is a slit, 93 is a light emitting element, and 95 and 97 are light receiving elements. By blocking the light from the light emitting element 93 by the shutter 49, it is detected whether or not the key is pressed.

In the key press detecting device for the automatic playing piano having the above configuration, when the key 13 is driven by the key drive unit 23, the shutter 49 hanging on the lower surface of the key 13 is slit.
It will move up and down in 53. The photo interrupter 61 detects this movement and detects information regarding key depression, such as the key depression state,
Detect the key pressing speed.

Here, since the sensor unit 25 supports the plurality of photointerrupters (detection means) 61 by the base member 71 and the mount member 69, the photointerrupter 61 adjusts the position in the longitudinal direction and the height with respect to the key 13. The position of the direction can be adjusted. Further, the position adjustment in the key arrangement direction is also possible.
As a result, it is easy to arrange the photo interrupter 61 at the most suitable position for the key depression information and adjust the position. Therefore, the accuracy of the detection can be improved.

That is, the height of the photo interrupter 61 is adjusted by the height adjusting screws 77 and 79, the front and rear positions thereof are adjusted by the screw 75 with respect to the slot 73, and the position adjustment in the key arrangement direction is performed by the slot 81. It is a thing.

Further, since the sensor unit 25 is configured independently of each electromagnetic actuator 27 and the key drive unit 23,
It has a compact structure as a whole. Further, the sensor unit 25 can be arranged on the front side of the key 13 regardless of the key drive unit 23. Furthermore, by using the photo interrupter 61 as the detection means, the movement of the key 13 can be detected without contact, and the detection accuracy is also improved from this point.

Second Embodiment FIGS. 9 to 11 show a second embodiment of the present invention.

FIG. 9 is a side view of the key depression detecting device according to the second embodiment. FIG. 10 is a side view showing the main part of the key press detecting device. FIG. 11 is a plan view of the base member according to the second embodiment.

As shown in these figures, in this embodiment, the sensor unit 25 fixed on the keyboard reed center (shelf) 11 is
The mount member 69 is supported on a substantially Y-shaped base member 101 as shown in FIG. Other configurations are the same as those in the above embodiment.

Further, FIGS. 12 to 15 show the hook in the first embodiment.
4 shows various modes of engagement relationship between 43 and the fork 39A of the lever 39.

In FIG. 12 and FIG. 13, the fork 39A is formed in a so-called step difference in which the left and right protrusions 40A and 40B have different heights. One projection piece 40A sandwiches the horizontal piece 105 of the hook 43 from above, and the other projection piece 40B sandwiches from below.

14 and 15, the end portion 107 of the lever 39 has a rectangular rod shape, and the hook 43 has a rectangular hole 109 into which the end portion 107 is inserted.
Is formed.

16 to 23 show various modes of fixing the hook 43 to the key 13.

In FIG. 16, the embedded metal fitting 111 is embedded in the key 13 and is fixed by the set screw 113. The hook 43 is inserted into the mounting hole 112 of the embedded metal fitting 111.

FIG. 17 shows that the upper rod portion of the hook 43 is inserted into the hole 115 formed in the lower surface of the key 13 and driven.

In FIG. 18, the hook 43 is screwed in via the expansion member 117. The expansion member 117 is made of metal or plastic.

Fig. 19 shows the hook 43 inserted loosely in the mounting hole 119 of the key 13 with the pin 121.
It has been prevented by the

FIG. 20 shows that the hook 43 has a spherical tip, the spherical portion is inserted into the mounting hole 122 of the key 13, and further the retaining plate 123 screwed to the lower surface of the key 13 prevents the hook from coming off.
3 is attached to the key 13.

As an example, FIG. 21 shows the upper half of the hook 43, and FIG. 22 shows an example of the lower half of the shutter 49. And FIG. 23 shows a state in which these are integrally assembled. It should be noted that the window 67 may have one stage or two stages above and below.

[Effect] As described above, according to the present invention, the detection accuracy is high, standardization is easy, the configuration is simple, the built-in adjustment is easy, and it is compact, so that it can be placed in front of the key. It is possible to obtain a key depression detection device.

Furthermore, in the above embodiment, the movement of the key can be directly detected by the photo interrupter. Further, the optical fiber, wiring, etc. can be omitted.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing the entire structure of a key-depression detecting device for an automatic playing piano according to a first embodiment of the present invention, and FIG. 2 is a main part of a key-depressing detecting device for an automatic playing piano according to the first embodiment. FIG. 3 is an exploded perspective view showing a portion, FIG. 3 is a side view showing a main portion of the key depression detecting device according to the first embodiment, and FIG. 4 is a plan view showing a base member according to the first embodiment. 5 is a plan view showing the mount member according to the first embodiment, FIG. 6 is a front view showing the mount member according to the first embodiment, and FIG. 7 is a view showing the photointerrupter according to the first embodiment. FIG. 8 is a plan view, FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7, FIG. 9 is a side view showing the arrangement of a key depression detecting device according to a second embodiment of the present invention, and FIG. FIG. 11 is a side view showing a main part of a key depression detecting device according to the embodiment, and FIG. 11 is a plan view showing a base member according to the second embodiment. FIG. 12 is an exploded perspective view showing another example of the hook and fork, FIG. 13 is a front view showing the assembled state of them, and FIG. 14 is an exploded perspective view showing another example of the hook and fork. Fig. 15 is a front view showing the assembled state, Fig. 16 is an exploded view showing an example of how to attach the hook, Fig. 17 is an exploded view showing an example of how to attach the hook, and Fig. 18 is a hook. Fig. 19 is an exploded view showing an example of how to attach the hook, Fig. 19 is an exploded view showing an example of how to attach the hook, Fig. 20 is an exploded view showing an example of how to attach the hook, and Fig. 21 shows the upper half of the hook. A front view, FIG. 22 is a perspective view showing an example of the shutter, and FIG. 23 is a perspective view after the hook and the shutter are assembled. 11 …… Shelves, 13 …… Keys, 15 …… In the reed, 19 …… In front of the reed, 27…
… Electromagnetic actuator, 61… Photointerrupter, 69…
… Mount member, 71 …… Base member.

Claims (1)

[Claims] 1. A shelf board (1) with the reed inside (15) of the keyboard reed as a fulcrum.
1) A key-depression detecting device having a plurality of detecting means (61) for detecting the movements of a plurality of keys (13) swingably supported on the keys (13). Te reed (15) and reed (19)
And a mount member (69) supported by the base member (71), the position of which is adjustable on the shelf plate (11) in the longitudinal direction of the key (13). )
The mount member (69) has both ends supported by the base member (71) such that the heights thereof can be adjusted independently of each other, and the detecting means (61) is connected to the mount member (69). )
A key-depression detection device characterized by being attached to a.