Apparatus for marking high point mark on tire

An apparatus for making a high point mark on a sidewall of tire at a peak position of a primary waveform of a radial force variation (RFV) of the tire comprising:

• rotating means for rotating a tire;
• reference pulse generating means for generating a reference pulse in synchronism with the rotation of the tire;
• processing means for generating first pulses the number of which corresponds to an angle over which said tire must be rotated from an instant at which said reference pulse is generated by said reference pulse generating means to an instant at which the peak position of RFV thereof reaches a marking position;
• pulse generating means for generating second pulses whose repetition frequency is proportional to a rotational velocity of the tire as rotated by said rotating means;
• servo control means comprising a counter which initiates, in response to said reference pulse, a count of said first pulses supplied from said processing means and said second pulses supplied from said pulse generating means in an up and down counting manner to produce a difference count value therebetween, and a digital/analog converter for converting the difference count value produced by said counter to an analog signal by means of which said rotating means is controlled;
• and
• marking means for marking a high point mark at the peak position of RFV on the sidewall of the tire, said tire being stopped at the marking position when said difference count value of the counter becomes zero.