EP 0308879 B2 19960508 - Two-motor movement, in particular for a radio clock
Title (en)
Two-motor movement, in particular for a radio clock
Title (de)
Zweimotoren-Räderwerk, insbesondere für eine Funkuhr
Title (fr)
Rouage à deux moteurs, en particulier pour montre réceptrice
Publication
Application
Priority
DE 8712809 U 19870923
Abstract (en)
[origin: EP0308879A2] A two-motor movement (11), in particular for a radio clock (10), in which, to correct the instantaneous display in accordance with the actual point in time, the passage of wheel apertures through the beam path (28, 34) of light barriers (27, 33) is detected, is to be designed to provide simpler conditions of assembly and a reduced energy requirement while providing more rapid possibilities for the correction of the display. For this purpose, the kinematically coupled second and minute wheels (18, 20) are driven by one motor (15) while the hour wheel (21) is driven in a manner kinematically independent of the said wheels by another stepping motor (24). Thus, rapid stepping on of the hour wheel (21) is possible without prejudicing the instantaneous position or stepping on of the second and minute wheel (18, 20). Because the positioning of the hour wheel (21) or of the hour hand moved by the latter does not require accuracy to one motor step, a simple reflex light barrier (28) can be used for position detection, with any desired mounting orientation of the hour wheel (21). On the other hand, the involvement of the third wheel (19) in a light barrier (34) leads to positioning or position detection of the minute wheel (20) accurate to one motor step. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP)
G04C 3/001 (2013.01); G04C 3/143 (2013.01)
Designated contracting state (EPC)
CH DE FR GB IT LI
DOCDB simple family (publication)
DE 8712809 U1 19871105; DE 3880603 D1 19930603; EP 0308879 A2 19890329; EP 0308879 A3 19910327; EP 0308879 B1 19930428; EP 0308879 B2 19960508
DOCDB simple family (application)
DE 8712809 U 19870923; DE 3880603 T 19880921; EP 88115449 A 19880921