Woodworking – Feeder or presser – Feed roll
Reexamination Certificate
2002-12-30
2003-12-23
Bray, W. Donald (Department: 3725)
Woodworking
Feeder or presser
Feed roll
C144S114100, C144S117100
Reexamination Certificate
active
06666243
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority of Taiwanese Application No. 091215803, filed on Oct. 4, 2002.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a height-adjustable workpiece feeding device for a wood planing machine, more particularly to a height-adjustable workpiece feeding device with feed-in and take-out rollers which can be moved synchronously in an upright direction relative to a worktable of the wood planing machine.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional wood planing machine is shown to include a mounting frame
11
, a worktable
13
which is movably mounted on the mounting frame
11
, a support carriage
12
which is movably mounted above the worktable
13
to confine a working passage
100
therebetween, and rubber feed-in and take-out rollers
141
(only one is shown) which are rotatably and respectively mounted on two sides of the support carriage
12
. A height-adjusting member includes four sliding blocks
142
(only two are shown) which are respectively disposed on two ends of the rollers
141
, four adjusting rods
143
(only two are shown) which are respectively disposed on top sides of the sliding blocks
142
and which extend outwardly of the mounting frame
11
, four screw nuts
144
(only two are shown) which are respectively disposed on the adjusting rods
143
, and four adjusting nuts
145
(only two are shown) which are respectively disposed on top ends of the adjusting rods
143
.
When it is desired to adjust the feed-in and take-out rollers
141
to a desired height, the adjusting nuts
145
are rotated to move the adjusting rods
143
and the rollers
141
upwardly and downwardly. However, since the adjusting rods
143
are moved separately by means of the adjusting nuts
145
, it is difficult to maintain the two ends of each of the feed-in and take-out rollers
141
at a same level, and it is likewise difficult to maintain the feed-in and take-out rollers
141
at a same level, thereby requiring calibration, which is time-consuming and inconvenient.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a height-adjustable workpiece feeding device for a wood planing machine, which permits convenient height adjustment of feed-in and take-out rollers of the device.
According to this invention, the height-adjustable workpiece feeding device includes a support carriage for supporting a cutter shaft of a wood planing machine thereon. The support carriage has right and left carriage sides which are respectively mounted on right and left sides of a mounting frame and above a worktable, and feed-in and take-out sides opposite to each other in a transverse direction. The support carriage is movable in an upright direction, and has two guideways which are disposed in the feed-in and take-out sides, respectively. Each of the guideways extends in the upright direction.
Two cam follower units are respectively received in the guideways and are respectively slidable along the guideways between upper and lower positions relative to the worktable. Each of the cam follower units has an engaging surface which faces downwardly.
Feed-in and take-out rollers are respectively journalled on the cam follower units so as to be rotatable about a first axis parallel to a cutter axis of the cutter shaft.
A connecting rod unit has two rod ends which are respectively mounted on the feed-in and take-out sides of the support carriage, and which are rotatable about a second axis transverse to the first axis.
Two cam units are respectively secured on the rod ends of the connecting rod. Each of the cam units has a cam surface which includes a first region and a second region that is disposed behind the first region in a clockwise direction about the second axis. As such, the cam units are synchronously rotatable by the connecting rod unit between a first position, where the first regions of the cam units respectively abut against the engaging surfaces of the cam follower units so as to place the cam follower units in the upper position, and a second position, where the second regions of the cam units respectively abut against the engaging surfaces of the cam follower units so as to place the cam follower units in the lower position.
Each of two biasing members is disposed to bias each of the cam follower units towards the cam surface of a respective one of the cam units.
REFERENCES:
patent: 4023421 (1977-05-01), Berlier et al.
patent: 6089287 (2000-07-01), Welsh et al.
patent: 6546975 (2003-04-01), Liao et al.
patent: 6601621 (2003-08-01), Wixey et al.
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