Flat sanding machine

Abstract

A flat sanding structure contains: a body including a first and a second wood planing zones. The second wooding zone has two supporting shelves and two grinding wheels. Two supports are connected with two first fixing pieces and two second fixing pieces, a third holding plate is fixed between the two grinding wheels and the two supporting shelves. Said each first fixing piece has a first through orifice and two elongated orifices, a first connecting shaft has a threaded orifice, a first holder is defined between the two first fixing pieces, and two posts are inserted into the two first fixing pieces and connected with the first holder. The first holder has a tab and an elongated hole. A second connecting shaft is inserted into each second fixing piece, a second holder is defined between the two second fixing pieces, and one of the two supports has a column.

What is claimed is: 
     
         1 . A flat sanding structure comprising: a body including a first wood planing zone and a second wood planing zone;
 the second wooding zone being formed between two tops of two supports fixed on two sides of the body respectively;   the second wood planing zone having two supporting shelves mounted on two inner walls of the two supports, respectively, and the second wood planing zone having two parallel grinding wheels arranged between the two supporting shelves, wherein each grinding wheel has a sanding belt rolled on a roller, a front end of each support is connected with each of two first fixing pieces, and a rear end of said each support is coupled with each of two second fixing pieces, a third holding plate is fixed between the two parallel grinding wheels and between the two supporting shelves;   wherein said each first fixing piece has a first through orifice formed proximate to a bottom thereof and has two elongated orifices defined adjacent to a top thereof, and a first connecting shaft is inserted into the first through orifice of said each fixing piece and has a threaded orifice arranged on a central position thereof, a first holder is defined between the two first fixing pieces, each of two posts is inserted into two opposite elongated orifices of the two first fixing pieces and is in connection with the first holder on which a first holding plate is fixed, wherein the first holder has a tab extending outwardly from a bottom of a front end thereof and has an elongated hole defined on the tab so as to accommodate a threaded rod which screws with the threaded orifice of the first connecting shaft;   wherein a second connecting shaft is inserted into a second through orifice of said each second fixing piece, and a second holder is defined between the two second fixing pieces and is configured to support a second holding plate; and   wherein one of the two supports has a column extending outward.   
     
     
         2 . The flat sanding structure as claimed in  claim 1 , wherein the threaded rod is rotated inward to drive the first holder to move outward, and said each post moves downward along the two opposite elongated orifices of the two first fixing pieces respectively, such that the first holder is driven to move downward by said each post. 
     
     
         3 . The flat sanding structure as claimed in  claim 1 , wherein the threaded rod is rotated outward to drive the first holder to move inward, and said each post moves upward along the two opposite elongated orifices of the two first fixing pieces respectively, such that the first holder is driven to move upward by said each post. 
     
     
         4 . The flat sanding structure as claimed in  claim 1 , wherein the column is configured to support an abutting plate, and the abutting plate has an angle controller fixed on the column, the angle controller has a driving lever and an arcuate slot. 
     
     
         5 . The flat sanding structure as claimed in  claim 4 , wherein a depth of the abutting plate in the second wood planing zone is adjusted by moving the angle controller on the column. 
     
     
         6 . The flat sanding structure as claimed in  claim 4 , wherein when the driving lever is released in the arcuate slot, a tilted angle of the abutting plate is adjusted. 
     
     
         7 . The flat sanding structure as claimed in  claim 4 , wherein and a position of the abutting plate is adjusted by moving the angle controller. 
     
     
         8 . The flat sanding structure as claimed in  claim 1 , wherein at least one cover is mounted above the column of the body, a fixer is disposed on the column, a suspension arm is rotatably connected with the fixer, and at least one locker is arranged on the suspension arm so as to lock the at least one cover. 
     
     
         9 . The flat sanding structure as claimed in  claim 8 , wherein the suspension arm drives the at least one cover to rotate along the fixer, and the at least one cover covers the two grinding wheels. 
     
     
         10 . The flat sanding structure as claimed in  claim 8 , wherein the at least one locker and the at least one cover are moved by the suspension arm. 
     
     
         11 . The flat sanding structure as claimed in  claim 8 , wherein a plurality of lockers are arranged on the suspension arm, plural covers are mounted above the column of the body, and each locker is configured to lock each cover.