escape wheel การใช้

• The Riefler escape wheel and pallets are of a special design.
• Pallet jewels are on the pallet fork and interact with the escape wheel.
• Another reason the escape wheel teeth are slanted backward is as a safety measure.
• At rest one of the escape wheel teeth will be locked against a pallet.
• The escape wheel tooth then imparts its energy on a second roller on the balance staff.
• It consisted of a pair of escape wheels on the same axle, with alternating radial teeth.
• When the pallet is pushing the escape wheel backwards it is also being driven hard against its stop.
• Since the escape wheel turns in only one direction, the balance receives impulse in only one direction.
• This causes considerable wear on the lubrication over time and may cause wear on the pallet or escape wheel.
• Another later refinement added by Breguet was the reduction in size of the second ( driven ) escape wheel.
• The anchor has slanted pallets on the arms which alternately catch on the teeth of the escape wheel, receiving impulses.
• As the powered escape wheel rotates clockwise, the entrance tooth slides across the sloping impulse plane of the entrance pallet.
• This turns the pallets about their axis, which places the exit pallet into the path of the rotating escape wheel.
• There are actually two escape wheels mounted on the same shaft and two surfaces on each of the two pallet pins.
• For example, the driven escape wheels are smaller than the drivers and a sprung setting for the detent is introduced.
• Instead of using teeth, the escape wheel has round pins that are stopped and released by a scissors-like anchor.
• An impulse from the escape wheel to the impulse roller is nearly dead-beat, meaning little sliding action needing lubrication.
• Chronometer escape wheels and passing springs are typically gold due to the metal's lower slide friction over brass and steel.
• Despite being locked at rest most of the time, the escape wheel rotates typically at an average of 10 rpm or more.
• This means that the pin holds the stop which holds the pallet in just the right place to engage cleanly with the escape wheel.