Uploaded July 2017 | Updated September 2026, 1 week ago
I had to repost this video because I forgot one video sequence and it is not possible to keep the old url. The video is now 2 minutes longer.
There exist variations of this mechanism (velocity trip).
The big white wheel with the teeth is the cam gear; this helps convert the rotational motion of the platter into linear motion. Therefore the label "cam," Here the cam gear moves a lever.
The trip mechanism is activated when the tone arm moves faster (this is the "velocity" part) at last groove of the record. The plastic trip linkage, which is connected to the tone arm, moves the metal trip levers slowly toward the platter gear while the record is playing. There is a singe tooth above the plastic platter gear. Both trip levers work together and are on the same pivot.; at the very end of the record, the lever closest to the tooth catches the tooth and the gears are activated. The movement of the cam gear forces the pin (itself part of a slide lever), which rides in a groove, toward the reset position--moving the tonearm toward the start position too. The motor shuts off because the switch opens.
I had to repost this video because I forgot one video sequence and it is not possible to keep the old url. The video is now 2 minutes longer.
There exist variations of this mechanism (velocity trip).
The big white wheel with the teeth is the cam gear; this helps convert the rotational motion of the platter into linear motion. Therefore the label "cam," Here the cam gear moves a lever.
The trip mechanism is activated when the tone arm moves faster (this is the "velocity" part) at last groove of the record. The plastic trip linkage, which is connected to the tone arm, moves the metal trip levers slowly toward the platter gear while the record is playing. There is a singe tooth above the plastic platter gear. Both trip levers work together and are on the same pivot.; at the very end of the record, the lever closest to the tooth catches the tooth and the gears are activated. The movement of the cam gear forces the pin (itself part of a slide lever), which rides in a groove, toward the reset position--moving the tonearm toward the start position too. The motor shuts off because the switch opens.
