Reciprocating linear sander

Abstract

A reciprocating linear sander has a base, at least one abrasive assembly, at least one reciprocating device and a driving device. The base has two sides and a belt. Each abrasive assembly is mounted in the base above the belt and has a rotating axle and an abrasive brush mounted around the rotating axle. The reciprocating device is connected respectively to the abrasive assembly and has a driven axle coaxially connected to the rotating axle of the abrasive assembly to allow the rotating axle to move reciprocatorily and linearly. The driving device is connected to the reciprocating device, drives the rotating axle of the abrasive assembly and has a couple to rotate the driven axle of the reciprocating device.

1 . A reciprocating linear sander comprising
 a base having
 a top; 
 a bottom; 
 two longitudinal sides; 
 at least four stanchions; 
   
     at least two crossbars mounted between two of the stanchions on the longitudinal sides; and
 a conveyor belt being movably mounted in the base between the longitudinal sides; 
 at least one abrasive assembly being mounted rotatably on the base above the conveyor belt and each abrasive assembly having
 two mounting brackets being mounted adjacent to the sides of the base and each mounting bracket having an inner side and an outer side; 
 a rotating axle being mounted rotatably through the mounting brackets and having
 a drive end; 
 a non-drive end; and 
 a central segment being mounted between the inner surfaces of the mounting brackets and above the conveyor belt; and 
 
 an abrasive brush being mounted around the central segment of the rotating axle; 
 
 at least one reciprocating device being connected respectively to the at least one abrasive assembly and each one having
 a driven axle being connected securely to the rotating axle of the corresponding abrasive assembly; and 
 a linear driver being connected to the driven axle to allow the rotating axle to move reciprocalorily and linearly; and 
 
 at least one driving device being connected respectively to the at least one reciprocating device, driving the rotating axle of a corresponding one of the least one abrasive assembly and each one having a couple being mounted slidably around and engaging the driven axle of the corresponding one of the at least one reciprocating device. 
 
   
   
       2 . The reciprocating linear sander as claimed in  claim 1 , wherein
 each reciprocating device further has a buffering frame being mounted securely on the outer side of one of the mounting brackets of the corresponding one of the at least one abrasive assembly and having
 a top; 
 an inner side; 
 an outer side; 
 a barrel being formed on and protruding from the buffering frame and being mounted rotatably around the rotating axle of the corresponding abrasive assembly; 
 an axle mount being formed through the outer side of the buffering frame of the at least one reciprocating device and communicating with the barrel; and 
 two bearings being mounted in the axle mount of the buffering frame; and 
   the driven axle of the corresponding reciprocating device being rotatably mounted slidably in the barrel and the bearings of the buffering frame and further has
 an external surface; 
 an inner end being connected securely to the drive end of the rotating axle; 
 an outer end protruding out of the buffering frame; 
 a fastener being mounted around the outer end of the driven axle; and 
 multiple engaging teeth being formed on the external surface of the driven axle and being mounted in the bearings of the buffering frame; and 
   the couple being rotatably mounted in the buffering frame near the outer side and further has
 an internal surface; 
 an inner end being mounted in the buffering frame in the bearings; 
 an outer end protruding out of the outer side of the buffering frame; and 
 multiple engaging grooves being axially formed in the internal surface of the couple and engaging the engaging teeth of the driven axle. 
   
   
   
       3 . The reciprocating linear sander as claimed in  claim 2 , wherein the at least one reciprocating device each further has
 a connecting collar being rotatably mounted securely around the driven axle of the corresponding reciprocating device, being connected to the fastener and having
 an external surface; and 
 a connecting wing being formed on and protruding from the external surface of the corresponding connecting collar; 
   the linear driver further has a drive shaft being disposed adjacent to the connecting wing of the corresponding connecting collar; and   a linking segment being connected to the connecting collar and the linear driver of the corresponding reciprocating device and having
 a crank being connected to the drive shaft of the linear driver; and 
 a connecting rod being connected to the crank and the connecting wing of the corresponding connecting collar. 
   
   
   
       4 . The reciprocating linear sander as claimed in  claim 3 , wherein
 the couple further has
 two locking rings being mounted around the couple adjacent to and abutting the bearings to hold the couple in the corresponding buffering frame; and 
 a couple wheel being mounted securely around the outer end of the couple; and 
   the at least one driving device further has a driving motor being mounted on the corresponding buffering frame, being connected to and driving the couple and having
 a driving shaft; 
 a drive wheel being connected securely to the driving shaft of the driving motor; and 
 a drive belt being mounted around the drive wheel and the couple wheel. 
   
   
   
       5 . The reciprocating linear sander as claimed in  claim 4 , wherein the at least one abrasive assembly each further has
 two clearance adjustors being connected to the base and respectively to a corresponding one of the at least one abrasive assembly at the ends of the rotating axle and having
 a guide frame being mounted on one side of the base and through one of the mounting brackets of a corresponding one of the at least one abrasive assembly and comprising 
   
     two guiding shafts being vertically mounted securely to the side of the base and each guiding shaft having a distal end; and
 a stopping block being mounted on distal ends of the guiding shafts to limit movement of the corresponding mounting bracket along the guiding shafts. 
 
   
   
       6 . The reciprocating linear sander as claimed in  claim 5 , wherein each clearance adjustor further comprises
 an adjustor shaft being mounted securely on the corresponding mounting bracket and parallel to the guiding shafts and having
 a connecting end being connected to the corresponding mounting bracket; 
 a distal end; and 
 an external thread being formed around the adjustor shaft near the distal end; 
 an adjustor pulley being rotatably mounted on the distal end of the adjustor shaft engaging the external thread and having an annular surface and multiple teeth formed on the annular surface; and 
   an adjustor driver being mounted on the top of the base between the guide frames and having a chain engaging the teeth of the adjustor pulleys.   
   
   
       7 . The reciprocating linear sander as claimed in  claim 6 , wherein each abrasive brush is a sand cloth. 
   
   
       8 . The reciprocating linear sander as claimed in  claim 1 , wherein the reciprocating linear sander has two abrasive assemblies being rotated in opposite directions. 
   
   
       9 . The reciprocating linear sander as claimed in  claim 1  further comprising
 a clearance adjustor being connected to the base and teach the at least one abrasive assembly to allow the at least one abrasive assembly to be moved relative to the conveyor belt.