Slide mechanism and rip fence of table saw

A table saw includes a slide mechanism on a table assembly and including a knob， front and rear roller pinions， two slides slidably secured to front and rear ends of the table respectively， each slide having a bottom rack engaging the roller pinion， a groove on an outer surface， and projections projecting out of the groove， front and rear mounting members secured to the table， and an axle; and a rip fence assembly on either side of the table assembly and including front and rear arms each having a cavity for releasably securing to one projection， a rip fence between the arms， front and rear risers respectively for fastening either end of the rip fence and either one of the front and rear arms， and two levers on the arms respectively， each lever including an upper pivot， an intermediate urging protuberance， and a lower protrusion.