Patent ID: 8681024

Claim:
An encoder without a stopping structure comprising: a rotating shaft ( 1 ), an axis sleeve ( 2 ), a stopping base ( 4 ), a positioning elastic trip ( 5 ), a spacer ( 6 ), a partition plate ( 7 ), at least one movable arm ( 8 ), at least one electric brush ( 9 ), and at least one main body ( 11 ), wherein the at least one movable arm ( 8 ), the at least one electric brush ( 9 ), and the at least one main body ( 11 ) match with each other; the rotating shaft ( 1 ) inserts through an axial hole of the axis sleeve ( 2 ); the stopping base ( 4 ) has an axial hole defined thereon so as to cooperate with an axial hole of the rotating shaft ( 1 ), the rotating shaft ( 1 ) also inserts through the axial hole of the stopping base ( 4 ) so that the stopping base ( 4 ) rotates with the rotating shaft ( 1 ) and is fixed in a recess of an upper surface of the rotating shaft ( 1 ); a retaining ring ( 3 ) is fitted onto the rotating shaft ( 1 ) and retains with the axis sleeve ( 2 ), such that the rotating shaft ( 1 ) and the axis sleeve ( 2 ) are axially positioned; the at least one movable arm ( 8 ) has an axial hole defined thereon so as to insert the rotating shaft ( 1 ), such that the at least one movable arm ( 8 ) rotates with the rotating shaft ( 1 ); each main body ( 11 ) has an axial hole formed thereon so as to insert the rotating shaft ( 1 ) and includes a circuit plate ( 111 ) mounted thereon, the circuit plate ( 111 ) has an end portion extending outwardly from the main body ( 11 ) so as to form a terminal ( 10 ) for connecting with an external circuit, and the circuit plate ( 111 ) has a surface for electrically contacting with a brush head ( 94 ) of a respective one of the at least one electric brush ( 9 ) so as to form a code signal which is outputted from the terminal; characterized in that the rotating shaft ( 1 ) and the stopping base ( 4 ) do not have any stopping structure, and a rotating angle of the rotating shaft ( 1 ) is equal to or greater than 360 degrees; each electric brush ( 9 ) has a plastic covered part ( 91 ), a bent part ( 92 ), an elastic arm ( 93 ), and the brush head ( 94 ) forming an integrated structure; the plastic covered part ( 91 ) is covered in a respective one of the at least one movable arm ( 8 ), the bent part ( 92 ) connects the plastic covered part ( 91 ) and the elastic arm ( 93 ) and bends the elastic arm ( 93 ) toward the plastic covered part ( 91 ), the elastic arm ( 93 ) has a main arm ( 931 ) with a long strip ring body and a branch arm ( 932 ), the brush head ( 94 ) is pressed at two free ends of the main arm ( 931 ) and the branch arm ( 932 ).