JP2639137B2 - Jig for attaching key sensor shutter and method of attaching key sensor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter mounting jig constituting a key position detection sensor (hereinafter, a key sensor) and a key sensor mounting method using the jig. A part of the jig is fitted into the shutter groove of the sensor body, and the hanging part of the shutter is inserted into the gap between the fitting parts to position the sensor body and the shutter, thereby fixing the shutter to the back of the key. It is intended to improve efficiency.

2. Description of the Related Art For example, an automatic piano, which is one of the keyboard musical instruments, is configured such that an automatic performance can be performed by mounting an actuator on a piano configured as a natural musical instrument.

The key sensor used for the automatic piano and the like is configured as follows. That is, the sensor body is fixed on the shelf, and the shutter is fixed on the back of the key. The movement of the shutter is detected by a photocoupler provided in the sensor body.

The key sensor having the two members, the sensor body fixed in this way and the shutter that moves independently from the sensor body, was attached to the piano as follows. That is, first 88
Shutters were fixed to the backs of all the keys, and then the sensor bodies were mounted on the shelf corresponding to these shutters.

Therefore, in the remodeling of an already sold piano into an automatic piano, for example, in a customer's home or the like, a service person visually and manually places the above sensors one by one (up and down position, horizontal position). ) I decided and attached.

[Problems to be Solved by the Invention] However, such a conventional sensor mounting method has the following problems.

In other words, the operation of attaching 88 shutters one by one to the back of the key required a lot of time and labor. Especially,
The shutter requires high-precision positioning with respect to the shutter groove of the sensor main body, and its installation requires a careful operation by a skilled service person. In addition, when a dedicated mounting device is not used for separately mounting the black key shutter and the white key shutter, work efficiency and mounting accuracy are reduced.

Accordingly, it is an object of the present invention to improve the efficiency of the operation of fixing the shutter of the key sensor to the back surface of the key and to increase the accuracy of the fixing position.

[Means for Solving the Problems] According to a first aspect of the present invention, a shutter having a plate-shaped hanging portion hanging down from a back surface of a key is fixed to an upper surface of a main body of a keyboard instrument, and the hanging portion is loosely inserted. A key sensor having a sensor body having a shutter groove, wherein the shutter is positioned with respect to the sensor body, and a shutter mounting jig for the key sensor for mounting the shutter on the back surface of the key; The fitting portion, which fits into the shutter groove and has a gap into which the hanging portion is inserted, extends in a direction substantially perpendicular to the extending direction of the fitting portion, and corresponds to the length of the hanging portion. An object of the present invention is to provide a jig for mounting a shutter of a key sensor having an extending portion having a thickness.

Further, the second invention of this application includes a fitting portion having a gap with a predetermined width, an extending portion extending from the fitting portion in a direction orthogonal to the extending direction and having a predetermined thickness, A step of preparing a jig having: a shutter in which one piece of the substantially L-shaped plate is fixed to the back of the key, and the other piece hangs down from the back of the key; Preparing a key sensor having a sensor body having a shutter groove formed therein, a step of inserting a fitting portion of the jig into the shutter groove of the sensor body, and a gap between the inserted fitting portion. Inserting the hanging portion of the shutter into the shutter and abutting the fixed portion of the shutter to the extension of the jig, bonding a double-sided adhesive member to the upper surface of the fixed portion, and connecting the sensor body to the key of the keyboard instrument. The process of positioning and fixing at the lower position, and pressing down the key to In by sticking a double-sided adhesive member, there is provided a method of mounting a key sensor including a step of fixing the shutter on the rear surface of the key, the.

[Operation] A key sensor mounting method according to the second invention of this application, which is performed using the shutter mounting jig according to the first invention of this application, is as follows.

That is, first, the jig and the key sensor are prepared.

Then, the jig is attached to the sensor main body by inserting the fitting portion of the jig into the shutter groove of the sensor main body of the key sensor.

Next, the hanging portion of the shutter is inserted into the gap formed in the fitting portion, and the fixed portion of the shutter is brought into contact with the extended portion of the jig. As a result of attaching the shutter to the jig in a state where the fixing portion is placed on the extending portion, the shutter is positioned at a fixed position with respect to the sensor main body.

Then, in the shutter in which the lower surface of the fixing portion abuts on the extending portion and is held by the jig, one surface of the double-sided adhesive member is adhered to the upper surface of the fixing portion of the shutter.

Next, the sensor body holding the shutter in this manner is positioned below a desired key of the keyboard instrument. For example, the sensor main body is fixed at a predetermined position on a shelf of a piano.

Then, the key is depressed to fix the fixing portion of the shutter to the back surface of the key. By pressing the back of the key against one exposed side of the adhesive member.

As a result, the shutter is fixed on the back surface of the key and the sensor body is fixed on the shelf plate with predetermined positioning. Also, the jig is detached from the sensor body after the shutter is fixed to the key back surface.

[Embodiment] Hereinafter, an embodiment of a key sensor shutter mounting jig according to the present invention and a key sensor mounting method performed using the jig will be described with reference to the drawings.

FIGS. 1A to 11 are views for explaining an embodiment of a key sensor shutter mounting jig according to the present invention and a key sensor mounting method using the mounting jig. I have.

First, the configuration of a shutter mounting jig for a key sensor of a keyboard instrument will be described.

In FIG. 1A, a key sensor unit 20 is provided below the key 11. That is, a band-shaped printed circuit board 21 having a predetermined width is placed on the shelf board via a case (not shown) of the key sensor unit 20. On the upper surface of the printed circuit board 21, a plurality of photo interrupters (sensor main bodies) 22 are arranged in a row corresponding to the plurality of keys 11.

The photo interrupter 22 is formed in a rectangular box-shaped block. Further, the photo interrupter 22 has a shutter groove 23 having a predetermined width and a predetermined depth, which is opened on the upper surface thereof. The shutter groove 23 extends along the width direction of the printed circuit board 21, and a side wall of the shutter groove 23 has
A pair of light emitting element and light receiving element are provided.

The shutter 12 constituting a key sensor together with the photo interrupter 22 is keyed by one or two tucker needles 13.
The back of 11 is fixed. FIG. 1 (A) shows a case where two tucker needles 13 and 13 are used for fixing, and FIG. 1 (B) shows a case where one tucker needle is used for fixing.

The shutter 12 is formed of a thin plate material bent in a substantially L-shape, and includes a hanging portion 14 that is freely inserted into and retracted from the shutter groove 23 and a fixing portion 15 that is fixed to the back surface of the key. In the hanging portion 14, a window 16 having a predetermined shape (rectangular shape with a step) is formed.

Also, in FIG. 1 (A), the photo interrupter 22
On top is a shutter spacer which is a jig for mounting the shutter
31 is installed. This shutter spacer 31
A fitting portion 32 inserted into the shutter groove 23;
And an extension portion 33 extending from 32.

A gap (slit) 34 having a predetermined width is formed on the upper surface of the fitting portion 32. The hanging portion 14 of the shutter 12 is inserted into the gap 34.

Further, in the same figure, a double-sided tape 41 as an adhesive member is adhered to the upper surface of the fixing portion 15 of the shutter 12. That is, a double-sided tape 41 having an adhesive adhered to both surfaces is adhered to the upper surface of the fixing portion 15 of the shutter 12 mounted on the upper surface of the photointerrupter 22, which is the sensor main body.

In FIG. 2, the key 11 is depressed and the double-sided tape 41
By pressing the upper surface of the key 11, the shutter 12 is fixed to the back surface of the key 11 via the double-sided tape 41, the shutter is positioned, and is fixed by the tucker needle 13.

As shown in the figure, a shutter 12 is fixed to a back surface (lower surface) of the key 11 via a double-sided tape 41 and is hung down. The hanging portion 14 of the shutter 12 is loosely inserted into the shutter groove 23 of the photo interrupter 22 on the printed circuit board 21 so as to have a predetermined depth. The adjustment of the insertion depth position of the hanging portion 14 is performed by the thickness of the extending portion 33 of the shutter spacer 31.

3 to 6 show the structure of the shutter spacer 31. FIG.

As shown in these drawings, the shutter spacer 31 includes the fitting portion 32 and the extension portion 33 as described above. The fitting portion 32 is a rectangular body having a predetermined width and a predetermined length, and is fitted into the shutter groove 23. Also, this fitting part
A gap 34 having a predetermined width into which the hanging portion 14 of the shutter 12 is inserted is formed in the 32 so as to extend in the vertical direction.

The extending portion 33 extends from the fitting portion 32 in a direction (horizontal direction) substantially orthogonal to the direction in which the fitting portion 32 extends (vertical direction). The extension 33 is a key for the shutter 12
11 has a thickness corresponding to the length of the hanging portion from the back surface (the vertical length of the hanging portion 14).

Further, as shown in FIGS. 7 to 9, the shutter 12 is a substantially L-shaped plate (FIG. 9). The shutter 12 has a fixing portion 15 fixed to the back surface of the key 11 by the double-sided tape 41 and the tucker needle 13, and a hanging portion 14 hanging from the back surface of the key 11. Further, a window 16 having a predetermined shape is formed in the hanging portion 14 corresponding to, for example, a black key / white key. Further, holes 17 for driving the tucker needle 13 are formed in the fixing portion 15.

Further, FIGS. 10 and 11 show the double-sided tape 41 as an adhesive member.

As shown in these figures, a plurality of double-sided tapes 41 are arranged at a constant width corresponding to the photointerrupter 22 and at a predetermined interval. For details, see Release Paper 42
Multiple double-sided tape 41 between the transparent film 43 and
Is sandwiched. For example, it is used corresponding to the number of the sensor bodies 22.

The key sensor according to the above configuration is attached as follows. For example, when converting a piano manufactured as a natural musical instrument into an automatic piano, this key sensor is attached. To describe this case as an example, first, the key sensor unit 20 is positioned and fixed on the shelf of the piano. Therefore, the photo interrupters 22 (sensor bodies) of the plurality of key sensors are fixed below each key 11 (first
(Refer to the photo interrupter at the position (A) in FIG. (A).) When arranging and fixing the photo interrupters 22 on the printed circuit board 21, they are arranged at predetermined intervals to correspond to the arrangement of the keys 11.

Then, in this state, the fitting portion 32 of the shutter spacer 31 is inserted into the shutter groove 23 of the photo interrupter 22. At this time, the extension portion 33 abuts and is placed on the upper surface of the photointerrupter 22 (see the photointerrupter at the position (B) in FIG. 1A).

Next, a gap opening on the upper surface of the shutter spacer 31
The hanging portion 14 of the substantially L-shaped shutter 12 is inserted into 34. At the same time, the fixing part 15 of the shutter 12 is
31 is brought into contact with the upper surface of the extension portion 33.

Further, one surface of a double-sided tape 41, which is a double-sided adhesive member, is adhered to the upper surface of the fixing portion 15 (see the photo interrupter at the position (C) in FIG. 1A). As a result,
Below the key 11, the upper surface of the double-sided tape 41 (on which an adhesive is adhered) is placed. That is, the photo interrupter
Reference numeral 22 denotes a key sensor which is arranged below the key 11 which is predetermined corresponding to the key sensor.

Then, the key 11 is pressed down, and the upper surface of the double-sided tape 41 is attached. Then, when the key 11 is released, the shutter 12 is fixed to the back surface of the key 11.
Thereafter, the shutter 12 is firmly fixed by the tucker needle 13. As a result, the relative position (horizontal position, vertical position) between the shutter 12 and the photo interrupter 22 can be accurately positioned.

[Effects of the Invention] According to the present invention, a key sensor can be attached to each home using a simple jig instead of a dedicated attachment device. Also, the time required for the mounting operation can be reduced. Further, the key sensor can be accurately attached.

[Brief description of the drawings]

FIG. 1A is a schematic perspective view for explaining an attached state of a key sensor according to one embodiment of the present invention, and FIG. 1B is a schematic view for explaining an attached state of a shutter according to one embodiment. FIG. 2 is a front sectional view of a shutter spacer of one embodiment, FIG. 2 is a front sectional view of a shutter spacer of one embodiment, FIG. 4 is a side sectional view of a shutter spacer of one embodiment, FIG. Fig. 6 is a plan view of a shutter spacer according to one embodiment. Fig. 6 is a bottom view of the shutter spacer according to one embodiment. Fig. 7 is a front view of the shutter according to one embodiment. Fig. 8 is a top view of the shutter according to one embodiment. FIG. 9, FIG. 9 is a side view of a shutter of one embodiment, FIG. 10 is a plan view of a double-sided tape of one embodiment, and FIG. 11 is a front view of a double-sided tape of one embodiment. 11 ... key, 12 ... shutter, 14 ... hanging part, 15 ... fixed part, 22 ... photo interrupter (sensor body, detecting part), 23 ... shutter groove, 31 ... shutter spacer (jig) , 32 ... fitting part, 33 ... extension part, 34 ... gap, 41 ... double-sided tape (double-sided adhesive member).

Claims (2)

(57) [Claims] 1. A key sensor comprising: a shutter having a plate-shaped hanging portion hanging down from a back surface of a key; and a sensor body fixed to an upper surface of a keyboard musical instrument main body and having a shutter groove into which the hanging portion is loosely inserted. A jig for mounting a key sensor for mounting the shutter on the back surface of the key in a state where the shutter is positioned with respect to the sensor main body, wherein the jig is fitted into the shutter groove and the hanging part is inserted. And a projection extending in a direction substantially perpendicular to the extending direction of the projection, and having a thickness corresponding to the length of the hanging part. A jig for mounting a shutter of a key sensor. 2. A jig having a fitting portion having a gap with a predetermined width and an extending portion extending from the fitting portion in a direction orthogonal to the extending direction and having a predetermined thickness is prepared. And when one piece of the substantially L-shaped plate is fixed to the back of the key,
A step of preparing a key sensor including a shutter whose other piece hangs down from the back surface of the key, and a sensor body having a shutter groove through which the hanging part of the shutter passes; Inserting the fitting portion of the jig, inserting the hanging portion of the shutter into the gap between the inserted fitting portions, and contacting the fixed portion of the shutter with the extended portion of the jig; A step of adhering a double-sided adhesive member to the upper surface of the keyboard, a step of positioning and fixing the sensor body below the key of the keyboard instrument, Fixing the key sensor to the back surface of the key.