JPH04178692A - Automatic opening and closing device of keyboard cap - Google Patents

Abstract

PURPOSE:To automatically open and close a keyboard cap by constituting the above device of the keyboard cap which covers a keyboard part, a cap opening/closing means which supports this keyboard map movably from above the keyboard part to the inside of the body of a musical instrument and a driving means which actuates this cap opening/closing means. CONSTITUTION:The rear surface of a rack 18 is imposed on pinions 17 on both sides of a revolving shaft 16 spanned on the inside surface on the inner side of the body 1 of the musical instrument to movably support the keyboard cap 7. Two pieces of projections 19, 20 are inserted into 1st and 2nd guide grooves 21, 22, by which the keyboard cap 17 is moved on a prescribed moving locus and the operation thereof is controlled by an automatic opening/closing device 15. The automatic opening/closing device 15 can automatically open the keyboard cap 7 merely when the keyboard cap 7 is slightly lifted at the time of opening the keyboard cap. The keyboard cap can be automatically closed simply by turning off a power source switch 8 at the time of closing the keyboard cap. Then, there is no danger for pinching the hand and fingers of an infant or others and the safe opening and closing of the keyboard cap 7 are assured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an automatic opening/closing device for a keyboard lid used in a keyboard instrument such as an electronic piano or an acoustic piano.

[Prior art and its problems] In keyboard instruments, when opening and closing the keyboard cover that covers the keyboard section provided on the main body of the instrument, the keyboard cover is placed above the keyboard section to prevent children and others from pinching their fingers and injuring themselves. It has been proposed to have a structure in which it slides (for example, Japanese Utility Model Application Publication No. 132589/1989).

This keyboard lid opening/closing device has a binion rotatably installed on both sides of the back side of the keyboard lid via a guide support shaft, and the binion is mounted on a rack provided on both inside surfaces of the instrument body on the back side of the keyboard. In addition to interlocking and placing it so that it can be transferred to
By slidably inserting both ends of the guide support shaft into guide grooves provided on both sides of the inside of the instrument body, almost parallel to the rack, the keyboard lid is movably supported, allowing children and others to easily hold the keyboard lid. It can be operated to open and close.

However, with this type of keyboard lid opening/closing device, the keyboard lid must be operated manually, which is cumbersome to open and close.Moreover, there is a risk of injury due to fingers being pinched when closing the keyboard lid. be.

[Purpose of the Invention] This invention was made in view of the above-mentioned circumstances, and its purpose is to provide a keyboard lid that can be opened and closed automatically without the risk of pinching fingers. Our objective is to provide an automatic opening/closing device.

[Summary of the Invention] The present invention provides a keyboard lid that covers a keyboard section provided on a musical instrument body, and a lid opening/closing means that movably supports the keyboard lid from above the keyboard section to inside the instrument body on the back side thereof. , and a driving means for opening and closing the keyboard lid by operating the lid opening/closing means.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the appearance of an electronic keyboard instrument. In this electronic keyboard instrument, a musical instrument main body 1 is supported at a predetermined height by a pair of support leg plates 2. The main body 1 of the musical instrument has a pair of side plates 3, the front half of which is lower and the rear half of which is higher.
are facing left and right, and between these side plates 3, there is an upper plate 4 at the upper part, a middle rice 5 at the middle rising part, and a front plate 6 at the front end.
, a bottom plate is provided at the bottom, and a back plate (none of which are shown) is provided at the rear, thereby forming a horizontally elongated box shape in which the front half is low and the rear half is high.

A keyboard section (not shown) is provided inside the front side of the musical instrument main body 1, and a keyboard lid 7 that covers the keyboard section in an openable and closable manner is provided above the keyboard section (not shown).
is located. Here, the keyboard section is a system in which white keys and black keys are rotatably arranged in the order of musical scales on a keyboard chassis, and sound is collected by turning on a rubber switch provided on the keyboard chassis by pressing each key. This is something that outputs a generation instruction signal. A power switch 8 is provided on the front plate 6 of the musical instrument body 1, and a tray 10 of a converted disc player 9 is provided so as to be retractable.

Furthermore, an automatic opening/closing device 15 for the keyboard lid 7 as shown in FIGS. 2 and 3 is provided inside the instrument body 1 on the back side. The automatic opening/closing device 15 includes a lid opening/closing means that movably supports the keyboard lid 7 from above the keyboard section to the inside of the back side of the instrument body 1, and opens/closes the keyboard lid 7 by operating the lid opening/closing means. and a driving means.

As shown in FIG. 2, the lid opening/closing means is mounted on a pinion 17 provided on both sides of a rotating shaft 16 rotatably spanned between the rear inner surface of the musical instrument body 1, on both sides of the lower surface of the keyboard lid 7. The keyboard lid 7 is supported movably by being placed in such a way that the teeth on the lower surface of the lug 18 which is provided on the rear side and protrudes from the rear side are engaged with each other. In addition, the lid opening/closing means is provided with two support protrusions 19.20 at the front and rear of the outer surface of the rack 8, and the tip of each support protrusion 19.20 is formed on the inner surface of the side plate 3 of the musical instrument body l on the high side. By being slidably inserted into the first and second guide grooves 21 and 22, the keyboard lid 7 is guided to move along a predetermined movement trajectory.

In this case, the first guide groove 21 is as shown in FIG.
The front side slopes diagonally upward and then gently slopes towards the back side, forming an approximately F shape. Also,
As shown in FIGS. 2 and 3, the second guide groove 22 is located parallel to the F side of the first guide groove 21 and is formed to extend linearly toward the back side thereof. The driving means is
As shown in FIG. 2, it is composed of a motor 23 that is provided on the inner surface of the musical instrument body 1 and is capable of forward and reverse rotation.A driving gear 23 provided on an output shaft 24 of this motor 23 is rotated, and this rotation is By transmitting the signal to the driven gear 26 provided on the rotating shaft 16 via the intermediate gear 27, the pinion 17
The structure is such that the rack]8 can be moved by rotating the rack.

Incidentally, at a position slightly above the front end of the first guide groove 21, as shown in FIG. A low-speed sensor 31 is provided near the top of the "H" shape to output a low-speed instruction signal to reduce the speed of the keyboard lid 7 to a low speed when the keyboard lid 7 closes.

Furthermore, an opening stop instruction sensor 32 is provided at the rear end of the second guide groove 22 to detect the opening stop position of the keyboard lid 7. Each of these sensors 30 to 32 has a light emitting element and a light receiving element facing each other, sandwiching the guide grooves 21 and 22, and detects when the support protrusion 19 or 20 passes between them. . Furthermore, as shown in FIG. 4, an obstacle detection sensor 33 with a pressure-sensitive element covered with a rubber sheet is continuously provided on the end surface of the keyboard lid 7, except for a portion of both ends. ing. In this case, the front lower end surface of the keyboard lid 7 does not come into contact with the upper surface of the front plate 6 of the instrument body 1, and the keyboard lid 7 is structured to close with a slight gap S between it and the obstacle detection sensor 33. ing. It should be noted that a locking portion 34 on which fingers are hung is provided on the front side of the keyboard lid 7.

The circuit configuration of such an electronic keyboard instrument is as shown in FIG. CPU (Central Processing Unit) 4
0 is given signals and data from the switch group 41, the keyboard section 42, the opening start instruction sensor 3o, the opening stop instruction sensor 31, the low speed instruction sensor 32, the obstacle detection sensor 33, and the like. Switch group 41 is power switch 8
It is equipped with various switches such as a switch for a compact disc player 9 and a switch for a compact disc player 9. The CPU 40 is connected to switch group 4.
When the power switch 8 of No. 1 is turned on and musical tone generation instruction data is given from the keyboard section 42, a musical tone is created in a musical tone generating circuit 43, and the musical tone is emitted from a speaker 45 via a mixing circuit 44. Further, when the player switch in the switch group 41 is turned on, the CPU 40 operates the compact disc player 9 and emits musical tones from the speaker 45 via the mixing circuit 44. Furthermore, CPU40
When a detection signal is given from the opening start instruction sensor 30, the motor 23 is rotated forward in the motor drive circuit 46, and when a detection signal is given from the opening stop instruction sensor 31,
When the motor drive circuit 46 stops the rotation of the motor 23 and a detection signal is given from the low speed instruction sensor 32, the motor drive circuit 46 slows down the rotation of the motor 23, and the obstacle detection sensor 33 detects an obstacle. When the signal is applied, the motor drive circuit 46 causes the motor 23 to rotate in reverse.

Next, the operation of the automatic opening/closing device 15 of the keyboard M7 is controlled by the sixth
This will be explained with reference to the operation flow shown in FIG.

First, the case where the keyboard M7 is opened will be explained.

When the power switch 8 is turned on, the motor 23 does not operate immediately, and the front side of the keyboard lid 7 is slightly lifted with fingers, etc., so that the first support protrusion 19 of the keyboard lid 7 shown in FIG. It moves in the guide groove 21 and waits until it passes the opening start instruction sensor 30 (step Sl).

Then, the first support protrusion 19 opens and the sensor 3 for instructing the start of opening opens.
When it passes the point 0, it opens and the start instruction sensor 3
゜ is detected and output to the CPU 40, and the motor drive circuit 46
causes the motor 23 to rotate normally (step S2).

When the motor 23 rotates normally in this way, the rotation is transmitted to the rotating shaft 1 through the driving gear 25, the intermediate gear 27, and the driven gear 26.
6 and rotates the pinion 17 of the rotating shaft 16 in the forward direction. As a result, the lug 18 moves from the front side to the rear side of the instrument body l, with the support protrusion 19.20 being guided by the guide groove 21.22 in accordance with the rotation of the pinion 17. Since the front side of the first guide groove 21 is inclined diagonally upward, the front side of the keyboard lid 7 moves diagonally upward and then moves toward the back side of the musical instrument body l. Then, when the keyboard lid 7 is pulled into the back of the instrument body 1 and the support protrusion 20 provided on the rack 18 moves to the back of the second guide groove 22 and reaches the opening stop instruction sensor 32, The open stop instruction sensor 32 detects this and outputs a detection signal to the CPlj 40 (step 33). Then, the motor drive circuit 46 stops the rotation of the motor 23 (step S4). As a result, the keyboard lid 7 is automatically opened and stored in the back side of the instrument body 1.

Next, the case of closing the keyboard M7 will be explained.

When the power switch 8 is turned off, the motor drive circuit 46 reverses the motor 23 (step S5).

Then, the pinion 17 of the rotating shaft 16 rotates in the opposite direction,
The rack 18 is moved from the back side to the front side. As a result, the keyboard M7 is inserted into the guide groove 21.22 and the support protrusion 19.
The instrument body 1 is moved from the back side to the front side while being guided by the instrument body 1. The support protrusion 19 is connected to the low speed instruction sensor 3.
1, the low speed instruction sensor 31 detects this and outputs a detection signal to the CPU 40 (step S6
).

Then, the motor drive circuit 46 reduces the speed of one revolution of the motor 23 to a low speed, and accordingly, the moving speed of the keyboard lid 7 slows down, and the front side of the keyboard lid 7 slowly lowers diagonally downward from above (step S7). ). At this time, the obstacle detection sensor 33 detects whether there is an obstacle such as a finger between the front end upper surface of the keyboard lid 7 and the upper surface of the front plate 6 of the musical instrument body l (step S8). If there are no obstacles, the keyboard lid 7 will be lowered, leaving a small gap S between the lower surface of the front end and the two sides of the front plate 6 of the instrument body 1, and the keyboard lid 7 will be closed to cover the keyboard section, and the motor will be driven. The circuit 46 stops the rotation of the motor 23 (step S9). As a result, the keyboard M7 is automatically closed.

If there is an obstacle between the keyboard M7 and the front plate 6 of the instrument body 1 when the keyboard lid 7 is closed in this way, the obstacle detection sensor 33 detects this and sends an obstacle detection signal to the CPU 40. The motor drive circuit 46 then rotates the motor 23 in the forward direction (step 510).

Then, the keyboard lid 7 begins to open again and is drawn into the back of the instrument body 1. Then, the keyboard lid 7 is completely retracted and the support protrusion 20 opens in the same manner as described above, and the stop instruction sensor 32
When the rotation of the motor 23 is reached, the rotation of the motor 23 is stopped (step 511). When the motor 23 is stopped in this way, the process returns to step S5 again and the closing operation of the keyboard lid 7 is started, and this operation is repeated until the keyboard lid 7 covers the keyboard section and is closed.

As described above, according to the automatic opening/closing device 15 for the keyboard lid 7, the keyboard lid 7 can be opened automatically by simply lifting it up a little, and the power switch 8 can be turned off when closing the keyboard lid 7. Just turn it off.

Since the keyboard lid 7 can be automatically closed without touching it, there is no risk of children getting their fingers caught, and the keyboard lid 7 can be opened and closed safely. In particular, when closing the keyboard lid 7, the moving speed of the keyboard lid 7 slows down before the rudder end of the keyboard lid 7 comes into contact with the top surface of the front plate 6 of the instrument body 1. If there is an obstacle such as a hand or fingers between the front plate 6 of 1, the closing operation of the keyboard lid 7 will be stopped, the keyboard M7 will be opened a full width, and then the closing operation will be repeated again, so that a child or other child may get their hands or fingers between them. This can definitely prevent you from getting injured.

In the above embodiment, an obstacle detection sensor 33 is provided on the upper surface of the front end of the keyboard lid 7 to detect the presence or absence of an obstacle, but the present invention is not limited to this. 50 (shown by a dotted chain line) is provided, and this torque sensor detects whether a torque (load) of a predetermined value or more is applied to the motor 23, thereby detecting whether the keyboard lid 7 has pinched an obstacle. The signal may also be output to the CPU 40.

Further, in the above embodiment, when the keyboard lid 7 is opened, the keyboard lid 7 is lifted slightly and the opening state is detected by the opening start instruction sensor 30, but the invention is not limited to this. The keyboard lid 7 may be configured to open and close, or the keyboard lid 7 may be configured to open and close in conjunction with the ejecting and retracting operation of the tray 10 of the keyboard disk 9. In this way, the opening and closing operations can be performed without touching the keyboard lid 7 at all, resulting in even higher safety.

Further, in the embodiment described in "-", the rotation of the motor 23 is transmitted to the rotating shaft 16 using a gear mechanism including a driving gear 25, an intermediate gear 27, and a driven gear 26, but the invention is not limited to this, and a belt or the like may be used. It may also be possible to transmit the information by transmitting the information and causing the rotation to idle when a load greater than a predetermined value is applied. In this way, there is no need to provide the low speed instruction sensor 3I. Also, motor 2
3 is not necessarily capable of forward and reverse rotation, and a motor for forward rotation and a motor for reverse rotation may be provided separately.

Further, in the above embodiment, the rack 18 is provided on the keyboard lid 7 side and the binion 17 is provided on the instrument body 1 side to constitute the lid opening/closing means, but the invention is not limited to this. , a rack may be provided on the instrument body 1 side. Moreover, the lid opening/closing means does not need to be composed of a rack or vinyl rack, but may be composed of a link mechanism such as a pantograph, for example.

``Advantageous Effects of the Invention - ■'' As explained in detail, according to the present invention, the keyboard lid is movably supported by the lid opening/closing means between the top of the keyboard and the inside of the instrument body on the back side. Since this lid opening/closing means is operated by a drive means to open and close the keyboard lid, the keyboard lid can be opened and closed automatically, and there is no danger of children getting their fingers caught when opening and closing the keyboard lid. There is no sex.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an electronic keyboard instrument to which the present invention is applied, and FIG. 2 is a perspective view showing main parts of an automatic keyboard lid opening/closing device.
Figure 3 is a side view showing the guide groove and each sensor provided on the side plate of the instrument body, Figure 4 is a sectional view of the front end with the keyboard lid closed, and Figure 5 shows the circuit configuration of the electronic keyboard instrument. FIG. 6 is a diagram showing the operational flow when opening the keyboard lid, and FIG. 7 is a diagram showing the operational flow when closing the keyboard lid. 1... Instrument body, 7... Keyboard lid, 8... Power switch, 15... Automatic opening/closing device, 17...
・Binion, 18...Rack, 23...Motor, 3
0...Sensor for instructing to start opening, 32...Sensor for instructing to stop opening, 33...Sensor for detecting an obstacle. Patent applicant Casio Computer Co., Ltd. Figure 1 Figure 5 Figure 6

Claims (4)

[Claims] (1) A keyboard lid that covers a keyboard section provided on a musical instrument body, a lid opening/closing means that movably supports the keyboard lid between above the keyboard section and into the instrument body on the back side thereof, and the lid. An automatic keyboard lid opening/closing device comprising: a drive means for operating an opening/closing means to open and close the keyboard lid. (2) The driving means operates the lid opening/closing means in conjunction with an on operation of a power switch or a slight opening operation of the keyboard lid, thereby drawing the keyboard lid into the instrument body. 2. The automatic keyboard lid opening/closing device according to claim 1. (3) The driving means operates the lid opening/closing means in conjunction with an off-operation of a power switch, thereby pulling out the keyboard lid from within the instrument body above the keyboard section. The automatic keyboard lid opening/closing device according to item 1. (4) While the keyboard lid is being pulled out from the instrument body to cover the keyboard section, it is detected whether there is an obstacle such as a finger on the movement trajectory of the keyboard lid, and the keyboard lid is pulled out from the instrument body to cover the keyboard section. 4. The automatic keyboard lid opening/closing device according to claim 3, further comprising detection means for outputting an instruction signal for operating said drive means so as to draw said drive means into a musical instrument body.