FIELD: designs of recording devices for measuring instruments, namely attachments for driving and changing record carriers used in tachographs for registering circular charts. SUBSTANCE: tachograph with flat housing in the form of parallelepiped includes retractable drawer carrying support and mechanism for driving said support. Chart disc is clamped to support automatically at closing retractable drawer. Clamping member is mounted freely with possibility of rotation on carriage moved by means of retractable drawer in curvilinear guides provided in housing. At closing drawer carriage is gripped and clamping member is locked on respective support; at opening drawer clamping member is thrown away from support. Apparatus provides clamping of chart discs and functions automatically due to motion of retractable drawer. EFFECT: low cost for making apparatus, small height of construction. 10 cl, 7 dwg
