Keyboard device of electronic musical instrument

Patent metadata

Field	Value
Publication number	US-2016293152-A1
Application number	US-201514931859-A
Country	US
Kind code	A1
Filing date	Nov 4, 2015
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

The invention provides a keyboard device of an electronic musical instrument, wherein a hammer can be installed correctly by a simple operation of pressing a key. The keyboard device of the electronic musical instrument includes: a chassis; a key disposed rotatably on the chassis and extending from the rear to a front; a support shaft disposed on the chassis in front of the rotation center; a hammer rotating in conjunction with the key along with pressing on the front of the key; a retaining hole formed through the hammer and retaining the support shaft; a guide groove guiding the support shaft in the retaining hole; and a shifting means, shifting from a temporarily secured state to a retained state, and pressing the hammer in the temporarily secured state toward the rear to shift the hammer to the retained state along with the pressing on the front of the key.

First claim

What is claimed is:

1 . A keyboard device of an electronic musical instrument, comprising:
a chassis; a key disposed rotatably on the chassis with a side of a rotation center of the key as a rear and extending from the rear to a front; a support shaft disposed on the chassis in front of the rotation center of the key; a hammer disposed rotatably around the support shaft and rotating in conjunction with the key along with pressing on the front of the key; a retaining hole formed through the hammer and retaining the support shaft such that the hammer is rotatable; a guide groove formed by cutting open the retaining hole on the rear and guiding the support shaft in the retaining hole; and a shifting means, shifting from a temporarily secured state where the support shaft is temporarily secured in the guide groove of the retaining hole to a retained state where the support shaft is retained in the retaining hole, and pressing the hammer in the temporarily secured state toward the rear to shift the hammer to the retained state along with the pressing on the front of the key.

2 . The keyboard device of the electronic musical instrument according to claim 1 , wherein the shifting means comprises:
a protrusion protruding from the key toward the hammer; a first contact part formed on a side surface of a rear of the protrusion to be in contact with the hammer in the temporarily secured state; and a first contacted part formed on the hammer to be in contact with the first contact part of the protrusion, wherein at least one of the first contact part of the protrusion and the first contacted part of the hammer is inclined downward from the rear to the front.

3 . The keyboard device of the electronic musical instrument according to claim 2 , wherein the first contact part of the protrusion and the first contacted part of the hammer are separated from each other when the hammer is in the retained state.

4 . The keyboard device of the electronic musical instrument according to claim 2 , wherein the protrusion protruding from the key protrudes from a position in front of the support shaft; and
a second contact part is formed on a tip part of the protrusion to be in contact with the hammer in the retained state and to be separated from the hammer in the temporarily secured state.

5 . The keyboard device of the electronic musical instrument according to claim 2 , wherein when the hammer is in the temporarily secured state, if the front of the key is pressed to shift the hammer to the retained state, the first contacted part is pressed obliquely downward and rearward by a force by the first contact part, by which the hammer is pressed rearward, and when a center of the support shaft is pressed to a position in front of a front end part of the guide groove, the support shaft is fitted into the retaining hole.

6 . The keyboard device of the electronic musical instrument according to claim 2 , wherein the guide groove has a tapered shape that is tapered from the rear toward the retaining hole, and a minimum width of the guide groove is smaller than a diameter of the support shaft.

7 . The keyboard device of the electronic musical instrument according to claim 2 , wherein the hammer has an inclined surface that descends on a rear of the guide groove such that the support shaft is kept in the temporarily secured state.

8 . The keyboard device of the electronic musical instrument according to claim 2 , wherein a rear of the hammer behind the support shaft is heavier than a front of the hammer.

9 . The keyboard device of the electronic musical instrument according to claim 2 , wherein at least one of the first contact part of the protrusion and the first contacted part of the hammer is inclined downward to form an inclination angle and the inclination angle is 22 degrees with respect to a vertical direction.

10 . The keyboard device of the electronic musical instrument according to claim 2 , wherein the support shaft protrudes from a sub-chassis of the chassis;
when the sub-chassis is injection-molded, a parting line is formed on the sub-chassis at a joint portion of a mold; and the parting line is formed in a front-rear direction at a same height as a center of the support shaft.

11 . The keyboard device of the electronic musical instrument according to claim 10 , wherein the guide groove is rotatable with respect to the parting line, such that the guide groove is inclined obliquely downward and rearward with respect to the parting line when the key is released, and extends in the front-rear direction in parallel to the parting line when the key is pressed.

12 . The keyboard device of the electronic musical instrument according to claim 1 , wherein the shifting means comprises:
a protrusion formed on the key and protruding from a position in front of the support shaft toward the hammer; a third contact part formed on a tip part of the protrusion to be in contact with the hammer in the temporarily secured state; a guide member fixed to the chassis and located obliquely downward and forward with respect to the third contact part of the protrusion; a fourth contact part formed on the guide member to be in contact with the hammer in the temporarily secured state; and a fourth contacted part formed on the hammer to be in contact with the fourth contact part of the guide member, wherein at least one of the fourth contact part of the guide member and the fourth contacted part of the hammer is inclined downward from the front to the rear.

13 . The keyboard device of the electronic musical instrument according to claim 12 , wherein the third contact part of the protrusion is in contact with the hammer in the temporarily secured state and in contact with the hammer in the retained state; and
the fourth contact part of the guide member and the fourth contacted part of the hammer are in contact with each other when the hammer is in the temporarily secured state and separated from each other when the hammer is in the retained state.

14 . The keyboard device of the electronic musical instrument according to claim 12 , wherein when the hammer is in the temporarily secured state, if the front of the key is pressed to shift the hammer to the retained state, the hammer is pressed rearward by a resultant force of a force that is pressed downward by the third contact part and a force that the fourth contact part presses the fourth contacted part obliquely upward and rearward, and a center of the support shaft is pressed to a position in front of a front end part of the guide groove to fit the support shaft into the retaining hole.

15 . The keyboard device of the electronic musical instrument according to claim 12 , wherein the guide groove has a tapered shape that is tapered from the rear toward the retaining hole, and a minimum width of the guide groove is smaller than the diameter of the support shaft.

16 . The keyboard device of the electronic musical instrument according to claim 12 , wherein the hammer has an inclined surface that descends on a rear of the guide groove such that the support shaft is kept in the temporarily secured state.

17 . The keyboard device of the electronic musical instrument according to claim 12 , wherein a rear of the hammer behind the support shaft is heavier than a front of the hammer.

18 . The keyboard device of the electronic musical instrument according to claim 12 , wherein at least one of the fourth contact part of the guide member and the fourth contacted part of the hammer is inclined downward to form an in

Assignees

• Roland Corp

Inventors

• Takata Yukihide
• Morohashi Yukihiro
• Uno Shiro

Classifications

• G10H1/346 Primary

  Keys with an arrangement for simulating the feeling of a piano key, e.g. using counterweights, springs, cams · CPC title

• G10H1/34 Primary

  Switch arrangements, e.g. keyboards or mechanical switches specially adapted for electrophonic musical instruments · CPC title

• G10H2220/221

  Keyboards, i.e. configuration of several keys or key-like input devices relative to one another · CPC title