Rotary woodworking machine

Details Rotary woodworking machine Rotary woodworking machine

2002-08-07

2003-01-28

Morgan, Eileen P. (Department: 3725)

Abrading

Machine

Combined

C451S178000, C451S299000, C451S461000

Reexamination Certificate

active

06511366

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority of Taiwanese Application No. 091208832, filed on Jun. 6, 2002.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a rotary woodworking machine, more particularly to a rotary woodworking machine with a rotary upright shaft which can effectuate reciprocating upward and downward movements by means of a cam mechanism during rotation.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional upright wood grinding machine
10
is shown to include a grinding unit
11
, a linear motion actuating unit
12
, and a transmitting unit
13
. The grinding unit
11
includes a hollow cylinder
111
, an upright shaft
112
which has an upper end extending through the cylinder
111
, and a sanding drum
113
which is mounted on the upper end of the upright shaft
112
. The linear motion actuating unit
12
includes a cam wheel
121
and a cam follower
122
which couples the cam wheel
121
to the cylinder
111
. The transmitting unit
13
includes a motor
131
with an output shaft
132
, a first belt
133
which couples the upright shaft
112
to the output shaft
132
such that a drive force of the output shaft
132
is transmitted to rotate the upright shaft
112
, and a second belt
134
which couples the cam wheel
121
to the output shaft
132
such that the drive force of the output shaft
132
is transmitted to rotate the cam wheel
121
, thereby effectuating reciprocating upward and downward movements of the cylinder
111
so as to permit the sanding drum
113
to grind a workpiece.
However, as the actuating force of the cam follower
122
is applied to a lateral side of the cylinder
111
, the cylinder
111
will deflect during the reciprocating movements and will obstruct the linear movement of the upright shaft
112
. Moreover, it is desirable to have a rotary woodworking machine that is provided with a plurality of woodworking members in addition to the sanding drum.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a rotary woodworking machine which can smoothly and steadily effectuate reciprocating upward and downward movements of an upright shaft when the upright shaft is rotated.
According to this invention, the rotary woodworking machine includes a linear motion stabilizing member which has top and bottom ends opposite to each other in an upright direction to define a guideway therebetween. A plunger is slidable along the guideway between higher and lower positions, and has an upper end proximate to the top end. An upright shaft extends along an upright axis in the upright direction, and includes a lower anchoring portion which is mounted to and which is rotatable relative to the upper end about the upright axis, an intermediate portion which extends uprightly from the lower anchoring portion and which has lifted and coupled segments respectively proximate to and distal from the lower anchoring portion, and an upper mounting portion which extends uprightly from the coupled segment. A lifting force receiving member has a pushed end which is disposed proximate to the lower anchoring portion and which permits the lifted segment to be rotatable relative thereto, and a securing end which is opposite to the pushed end in the upright direction and which is rotatable relative to the pushed end so as to be rotated with the lifted segment. A motor has an output shaft for delivering a drive force. A lifting lever includes a fulcrum end pivotally mounted on a support frame about a pivot axis transverse to the upright axis, a force end opposite to the fulcrum end, and a weight portion interposed between the fulcrum end and the force end. A cam member is coupled to the output shaft and the force end such that the drive force of the output shaft is transmitted to effectuate reciprocating upward and downward movements of the force end in the upright direction. The upward movement of the force end causes the weight portion to push against the pushed end so as to lift the lifted segment as well as the plunger from the lower position to the higher position. A transmitting shaft is journalled on the support frame, and is driven by the drive force to rotate about an axis which is transverse to the upright axis and the pivot axis. The transmitting shaft includes a coupling segment to couple with the coupled segment such that the rotation of the transmitting shaft is transmitted to rotate the coupled segment when the lifted segment is moved between the lower and higher positions.


REFERENCES:
patent: 2948088 (1960-08-01), Jepson
patent: 3879896 (1975-04-01), Maxfiled et al.
patent: 5168656 (1992-12-01), Jolly et al.
patent: 5806369 (1998-09-01), Takenaka et al.
patent: 6095906 (2000-08-01), Wang
patent: 6244228 (2001-06-01), Kuhn et al.
patent: 6386958 (2002-05-01), Wang

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