Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Reexamination Certificate
2000-11-22
2002-07-23
Fenstermacher, David (Department: 3682)
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
C074S567000
Reexamination Certificate
active
06422099
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a transmission device for knife changing mechanism of a machine center wherein the transmission distance between the cam and the main shaft is shortened and a gap between the control shaft can be adjusted.
BACKGROUND OF THE INVENTION
A conventional transmission device
60
for knife changing mechanism of a machine center is shown in FIG.
7
and generally includes a motor which drives a belt
62
with its output shaft
61
and a gear shaft
63
is rotated by the belt
62
. A worm gear
631
is connected to the gear shaft
63
and engaged with a worm gear disk
641
on a cam
64
. An arm
65
is pivotally connected to the cam
64
and clamps a main shaft
66
so that when the cam
64
is rotated, the main shaft
66
is moved up and down to activate a knife changing device. A main shortcoming is that the distance from the gear shaft
63
to the cam
64
is so long that a large scale of cam
64
is required which is costly and heavy. An unexpected gap is found between the gear shaft
63
and the cam
64
after being used for a period of time, this gap will result in a huge wear between the gear shaft
63
and the worm gear disk
641
. Not only noise is generated but the precision of the knife changing is reduced, and this could make knife drop happen. Furthermore, the main shaft
66
is movably mounted to a hexagonal post
67
, and the precision between the main shaft
66
and the hexagonal post
67
is obtained by a costly price.
The present invention intends to provide a transmission device for knife changing mechanism wherein the distance between the control shaft and the cam is shortened.
SUMMARY OF THE, INVENTION
In accordance with one aspect of the present invention, there is provided a transmission device for knife changing mechanism of a machine center and comprising a motor connected to a top of a casing and driving an output shaft on which a first bevel gear is connected to the output shaft and engaged with a second bevel gear mounted to a cam shaft on which a cam disk is mounted. A first groove is defined in a first side of the cam disk and a second groove is defined in a second side of the cam disk. A rack has a first pin movably engaged with the first groove and an arm having a first end pivotally connected to the casing and a pin extends from the arm and movably engaged with the second groove. A main shaft movably extends through the top of the casing and has a toothed section and an annular groove is defined in an outer periphery of the main shaft. A second end of the arm is engaged with the annular groove. A tube is connected to the top of the casing and the main shaft is movably inserted in the tube. A first detection device and a second detection device are respectively and radially connected to the tube. A control shaft extends through an aperture defined through the top of the casing and is fixedly connected to a cap on the top of the casing. A first idle gear and a second idle gear are respectively mounted to the control shaft. The first idle gear is engaged with the rack and the second idle gear is engaged with the toothed section on the main shaft.
The primary object of the present invention is to provide a transmission device for knife changing mechanism and the device has a compact size and the distance between the control shaft and the cam is shortened.
These and further objects, features and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, several embodiments in accordance with the present invention.
REFERENCES:
patent: 5337623 (1994-08-01), Huang et al.
patent: 5752905 (1998-05-01), Yan et al.
patent: 6098478 (2000-08-01), Sandrock
Bacon & Thomas PLLC
Fenstermacher David
Stefanon Justin
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