1. Field of the Invention
This invention relates to a band saw, particularly to a quick adjusting device for a lower guide base of a band saw so as to easily and quickly adjust the location of the lower guide base for changing a band saw body.
2. Description of the Prior Art
A conventional band saw generally has a lower guide base, which consists of a stationary base fixed on a work table, and a saw back leaning member and a saw surface guiding member. The saw back leaning member is fixed on top of the stationary base for urging and guiding the rear edge of the band saw body and the saw surface guiding member is fixed at the front end of the stationary base for sandwiching the two surfaces of the band saw body. Then in case of changing band saw bodies of different width, a user has to adjust the saw back leaning member and the saw body sandwiching member for correctly guiding a new band saw body in moving.
However, the saw back leaning member is located below the worktable, a user cannot directly adjust it before the worktable is taken off, very inconvenient to handle.
The quick adjusting device for a lower guide base of a band saw in the present invention is composed of a base plate, a tightening member, an adjusting base, a guide unit and an adjusting rod. The base plate is connected firmly with the lower guide base of a band saw, moving the lower guide base together, having a transverse guide slot for the tightening rod to pass through and then screwing with a work table tightly or loosely. The adjusting base is fixed on the work table, having two sides respectively combined with the guide unit to fit in and for the adjusting rod to engage so that the base plate and the lower guide base may be shifted by rotating the threaded rod and guided movement of the guide unit.
The device in the invention can let the threading rod rotated for adjusting the locations of the base plate together with the lower guide base to suit to band saws with various width, without necessity of taking off the lower guide base as required in a conventional band saw, very convenient for replacing a band saw with different width.
This invention will be better understood by referring to the accompanying drawings, wherein:
A preferred embodiment of a quick adjusting device for a lower guide base of a band saw in the present invention, as shown in
The quick adjusting device 20 includes a base plate 21, a tightening member 22, an adjusting base 23, a guide member 24 and an adjusting rod 25.
The base plate 21 is shaped as L, having a horizontal plate 211 and a vertical side plate 212 extending down from one side of the horizontal plate 211, which is provided with a lateral threaded hole 213 and a lateral guide hole 214 spaced apart on its surface, and a plurality of pin holes for position pins 215 to fit through and in the stationary base 11 of the lower guide base 10 for combining the base plate 21 with the lower guide base 10. Then the lower guide base 10 can move together with the base plate 21. The vertical side plate 212 is provided with a transverse guide slot 216.
The tightening member 22 is a handle in this embodiment, consisting of a handle member 221 and a head member 222. The head member 222 further has a screw member 223 extending outward, to pass first through the guide slot 216 and then screw with the wall of the table 30 so as to tighten and loosen the base plate 21.
The adjusting base 23 is fixed firmly on a sidewall of the table 30, provided with a gap 231 defined by two parallel walls in its top, and a limit groove 232 respectively formed in one end of the parallel walls and a hole 233 respectively near the other end of the two parallel walls.
The guide unit 24 consists of a guide bar 241 with one end extending in the guide hole 214 of the base plate 21 and the other end extending through the holes 233 of the adjusting base 23, and a ring 242 fitted in the gap 231. Then a screw 243 screws sidewise with the ring 242 and also presses the guide bar 241 extending through the ring 242 to keep the guide bar 241 tightly immovable so as to guide the base plate 21.
The adjusting rod 25 is provided with a threaded rod portion 251 in one end to engage with the threaded hole 213 of the base plate 21 and a ring-shaped member 252 of a large diameter, and a collar 253 of a small diameter respectively formed at two sides of the ring-shaped member 252, and a stop member 254 extending from the ring-shaped member 252 and larger than the collars 253 so that the ring shaped member 252 may move and fit in the gap 231 of the adjusting base 23 horizontally, with the two collars 253 may move horizontally and fit in the limit grooves 232 and be stopped in place by the stop member 254 and the relative wall of the adjusting base 23. Then the adjusting rod 25 is kept in the limit position on the adjusting base 23, and the ring shaped member 252 is rotated to rotate the adjusting rod 25 for linearly moving the base plate 21 to suit to the width of the band saw body 40.
Next, in replacing an old band saw body 40 with a new one having a different size, as the rear edge of the new saw body 40 may be located not the same as the old one, in other words, the surface of the new saw body 40 is wider or narrower than the old one, the saw back leaning member 12 has to be shifted in its location to suit to the rear edge of the new saw body, by loosening the tightening member 22 and rotating the adjusting rod 252 to move linearly the base plate 21 together with the lower guide base 10 in the width direction of the saw body 40, letting the saw back leaning member 12 to urge and guide the rear edge of the new saw body 40. Then the tightening member 22 is rotated tightly again against the base plate 21 to finish the adjusting process.
It is necessary to mention that in this invention the work table (not shown) is not needed to be taken off in replacing an old saw body with a new one, only loosening and tightening of the tightening member 22 and rotation of the adjusting rod 25 is enough for the work, very effective.
While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.