Metal deforming – By plural tool-couples – With means to feed work between plural tool stations
Reexamination Certificate
2000-03-18
2001-08-07
Crane, Daniel C. (Department: 3725)
Metal deforming
By plural tool-couples
With means to feed work between plural tool stations
C072S405010, C470S095000, C470S109000, C470S154000, C074S110000
Reexamination Certificate
active
06269673
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a reciprocating mechanism for a forging machine, more particularly to a reciprocating mechanism that transfers a driving force without vibrating a swing mechanism of the forging machine.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional forging machine
1
is shown to comprise a machine frame
11
, a plurality of female dies
12
mounted on the machine frame
11
, a support member
13
mounted on the machine frame
11
above the female dies, and a swing mechanism
15
connected movably to the support member
13
. The swing mechanism
15
includes a swing plate
14
and a plurality of workpiece holding members
151
connected operatively to the swing plate
14
. The swing plate
14
is connected to a conventional reciprocating mechanism in order to reciprocate in a left-and-right direction in
FIG. 1
via a horizontal linkage mechanism
18
. During the reciprocal movement of the swing plate
14
, the workpiece holding members
151
hold and transfer in sequence blanks to the female dies for carrying out subsequent punching processes.
Referring to
FIG. 2
, the conventional reciprocating mechanism includes an inverted Y-shaped rocker arm
17
having an upper end connected pivotally to the horizontal linkage mechanism
18
, and two separate lower ends
172
that engage alternately a cam member
16
when the cam member
16
is driven to rotate. The rocker arm
17
swings to reciprocate the swing plate
14
via the horizontal linkage mechanism
18
.
The disadvantage of the conventional reciprocating mechanism resides in that, because the torque applied to the horizontal linkage mechanism
18
is opposed to the inertia of the horizontal linkage mechanism
18
and the swing plate
16
at two dead points of each stroke of the rocker arm
17
, the upper end
171
of the rocker arm
17
is liable to flex and vibrate at the dead ends. The vibrations of the rocker arm
17
will transfer to the swing plate
14
via the horizontal linkage mechanism
18
, thereby resulting in shaking or wobbling of the swing plate
14
. The shaking or wobbling of the swing plate
14
adversely affects the subsequent punching processes.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a reciprocating mechanism that transfers a driving force without vibrating a swing mechanism of a forging machine.
According to the present invention, a reciprocating mechanism includes a seat body, a longitudinal first slide member, and a second slide member. The seat body has therein a longitudinal first guiding groove, a second guiding groove intersecting the first guiding groove, and a crossing space at the intersection of the first and second guiding grooves. The first slide member is disposed slidably and reciprocatingly in the first guiding groove across the crossing space, and has a longitudinal cam member extending longitudinally of the first slide member. The second slide member is mounted slidably on the seat body along the direction of the second guiding groove, and incorporates a cam follower which extends into the crossing space to contact the cam member. The cam follower is movable to-and-fro along the second guiding groove when the cam member reciprocates along the first guiding groove, thereby moving reciprocatingly the second slide member along the second guiding groove.
In a preferred embodiment, the first slide member includes a plate member having two opposite substantially straight longitudinal sides extending along the direction of the first guiding groove, two opposite transverse ends transverse to the longitudinal sides, and a cam support face between the longitudinal sides. The cam member projects from the cam support face in the form of a bent ridge which has a first section that extends longitudinally adjacent to one of the longitudinal sides and one of the transverse ends, a second section that extends longitudinally adjacent to another one of the longitudinal sides and another one of the transverse ends, and a third section that is curved and that inclines gradually from the first section to the second section. The cam follower includes a contact roller which is mounted on the second slide member and which extends into the crossing space adjacent to the cam member. The contact roller has a rolling face in contact with the cam member.
Preferably, the seat body includes a longitudinal first guiding seat and a transverse second guiding seat. The first guiding seat has an intermediate part formed with a positioning groove extending transversely of the first guiding seat to position the second guiding seat. The first guiding groove extends longitudinally of the first guiding seat and passes through the second guiding seat. The second guiding groove is formed in the second guiding seat and passes through the first guiding groove. The second slide member is mounted slidably inside the second guiding groove. The first slide member is slidably mounted inside the first guiding groove below the second slide member.
Preferably, the cam follower further includes a thrust roller which is mounted on the second slide member and which is in rolling contact with one side of the cam member opposite to the contact roller. The contact roller is biased to press the cam member against the thrust roller. The second slide member further includes a first shaft mounted rotatably thereon. The first shaft has a first part extending into the contact roller, and a second part extending outwardly of the contact roller. The first part is eccentric to the second part so as to place the contact roller in a position eccentric to the second part. The second slide member further includes a push rod which has one end connected to the second part of the first shaft and which has an opposite end extending radially outward away from the first shaft. A biasing unit is mounted on the second slide member to bias the opposite end of the push rod so that the first shaft is turned in one direction and moves eccentrically the contact roller toward the cam member.
The biasing unit includes a stationary support mounted on the second slide member, a cantilever arm which extends from the stationary support to the push rod and which passes through the opposite end of the push rod, and a coiled spring sleeved onto the cantilever arm to urge the push rod. The second slide member includes a bottom side adjacent to the first slide member, a top side opposite to the bottom side, and two through holes extending from the top side to the bottom side. The contact and thrust rollers are disposed adjacent to the bottom side. The first shaft extends through one of the through holes. The thrust roller has a second shaft extending through another one of the through holes. The biasing unit is disposed at the top side.
REFERENCES:
patent: 966046 (1910-08-01), Noonan
patent: 3077259 (1963-02-01), Braun
patent: 3120970 (1964-02-01), Tucker
patent: 3421637 (1969-01-01), Sofy
patent: 3655070 (1972-04-01), Haydu
patent: 3999495 (1976-12-01), Rouse
patent: 4402677 (1983-09-01), Radocaj
patent: 4524630 (1985-06-01), Toth
Christie Parker & Hale LLP
Crane Daniel C.
San Shing Hardware Works Co., Ltd.
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