brake cams attached to the solenoids clamp the strings preventing those pins from lowering.
The solenoids remain energized for only a second, and the weight of the pins keeps the
brakes engaged. The brakes will release automatically when upward pressure is placed on
the strings as the drawbar returns to the HOME position during the next cycle.
Meanwhile, the ball is guided to the ball exit by the slope of the pit where it enters the
ball accelerator and is returned to the bowler. The pins that had not been knocked over
continue to be lowered to the pin deck and are set for the second ball of the frame. When
the pins are deposited on the pin deck, the drawbar has only traveled part way towards
the limit of its forward movement. It continues on for several more inches. This does
two things: 1) It raises the shield in front of the pin deck which lowered when the pins
were cycled up, and 2) It provides the necessary slack in the strings to ensure the proper
operation of the pin detectors. There needs to be sufficient slack available for this as well
as to ensure that string tension does not influence the action of the pins. After the second
ball is rolled, the fallen pins are registered, the total is sent to the scoring system (if
applicable), and the machine sets a complete set of pins for the next frame.
More Details
TMS Control Chassis
Figure 2, TMS Control Chassis
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