EP 0294717 B1 19920819 - KEY FORCE-DISTANCE RATIO MEASURING DEVICE FOR KEYBORD INTRUMENTS
Title (en)
KEY FORCE-DISTANCE RATIO MEASURING DEVICE FOR KEYBORD INTRUMENTS
Publication
Application
Priority
AT 144587 A 19870609
Abstract (en)
[origin: EP0294717A2] The device is used to monitor the keyboard (2) of a keyboard instrument. By means of the device, the force-distance ratio for the individual keys (6, 7) is determined. Provided above the keyboard (2) is a guide rail (1) on which a stepping motor (4) is displaceably mounted. The spindle (5) of this stepping motor (4) is directed towards the individual keys (6, 7) and is displaceable against the latter by steps. This spindle (5) is further fitted with a pressure- sensitive sensor (8). The sensor (8) and the drive of the stepping motor (4) are connected via an electronic control device to a recording unit (stylus and/or printer) which records the force necessary to depress the key, as a function of distance. From the recordings and/or diagrams thus produced, it is possible to determine whether the keyboard is in order or requires to be overhauled or even repaired. <IMAGE>
IPC 1-7
IPC 8 full level
G10C 9/00 (2006.01)
CPC (source: EP)
G10C 9/00 (2013.01)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0294717 A2 19881214; EP 0294717 A3 19891123; EP 0294717 B1 19920819; AT 388254 B 19890526; AT A144587 A 19881015; AT E79685 T1 19920915; DE 3873831 D1 19920924
DOCDB simple family (application)
EP 88108885 A 19880603; AT 144587 A 19870609; AT 88108885 T 19880603; DE 3873831 T 19880603