1. Field of the Invention
The present invention relates to a sander device, and more particularly to a sander device having a vibrating mechanism.
2. Description of the Prior Art
Typical sander devices comprise an endless sander belt engaged around one or more rollers so as to be driven by the rollers and in order to sand or work onto the work pieces. Both the rollers and the sander belt may not be rotated or vibrated such that the sander belt may not be adjusted or changed relative to the work pieces.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional sander devices.
The primary objective of the present invention is to provide a sander having a vibrating mechanism for vibrating the sander belt and for removing some of the dust from the sander belt.
In accordance with one aspect of the invention, there is provided a sander comprising a support, a first roller rotatably secured to the support at a pivot shaft, a bracket rotatably supported on the support at a pivot pin, a second roller rotatably secured to the bracket at a pivot axle, a sander belt engaged around the first roller and the second roller. and means for rotating the bracket about the pivot pin to twist the sander belt.
The rotating means includes an actuator disposed on the support, the actuator includes a rod extended therefrom and engaged with the bracket for rotating the bracket about the pivot pin. The bracket includes a pole extended therefrom and engaged with the rod for allowing the actuator to rotate the bracket about the pivot pin via the rod and the pole. The actuator includes a follower secured to the rod, the follower includes a cavity formed therein for receiving the pole. A spring biasing device may further be provided for biasing or for recovering the rod backward to the original position.
The rotating means includes a valve device coupling the actuator to an air source, and the valve device includes means for selectively supplying the air to the actuator. The valve device includes a first port coupled to the actuator and a second port for coupling to the air source, the selectively supplying means includes a spindle rotatably received in the valve device, the spindle includes a groove formed therein for selectively communicating the first and the second ports with each other when the spindle is rotated relative to the valve device. The valve device includes an air exit, the spindle includes a recess for selectively communicating the first port and the air exit of the valve device with each other when the spindle is rotated relative to the valve device.
The selectively supplying means includes a means for actuating the spindle to rotate relative to the valve device. The actuating means includes a lever secured to the spindle, and an air outlet directed toward the lever to rotate the spindle with the lever. The lever includes a disc attached thereto and facing toward the air outlet for allowing the air from the air outlet to act onto the disc of the lever.
Further objectives and advantages of the present invention will become apparent from a careful reading of a detailed description provided hereinbelow, with appropriate reference to accompanying drawings.