Machine element or mechanism – Mechanical movements – Reciprocating to reciprocating
Patent
1994-07-27
1996-11-05
Bonck, Rodney H.
Machine element or mechanism
Mechanical movements
Reciprocating to reciprocating
F16H 2144
Patent
active
055706070
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a lever apparatus having a stationary fulcrum, a movable force point and a movable action point, and also to a machine which incorporates the same.
BACKGROUND ART
A lever apparatus is widely used in the field of machinery, such as machine tools and industrial machines, and in the power transmission portions of moving mechanisms of structures of various types. FIGS. 1 and 2 show examples of a power transmission mechanism that utilizes the principles of a lever.
In the example shown in FIG. 1, pin links 13 and 14 are provided for the circumferential portions of a disk 12 rotatable with a stationary fulcrum as a center, such that the pin links 13 and 14 are apart from each other by 90.degree.. The pin link 13 serving as a force point is coupled, through a coupling member 15a extending in a tangential direction of the disk 12, to one end of a driving arm 17 supported by a support shaft 16. The other end of the driving arm 17 is coupled through a driving link 18 to a driving section. The pin link 14 serving as an action point is coupled, through a coupling member 19a extending in a tangential direction of the disk 12, to the tip end of a driven section 22 of a hydraulic device 21 supported by a support shaft 20.
In the example shown in FIG. 1, the linear motion of the driving link 18 rotates the driving arm 17, and power is transmitted through the coupling member 15a to the disk 12 (i.e., a lever apparatus) and is further transmitted through the coupling member 19a to the hydraulic device 21. However, the pin links 13 and 14, respectively serving as a force point and an action point, describe an arc when the disk 12 is rotated. Thererover each of the coupling members 15a and 19a does not linearly reciprocate but swings widthwise. In other words, the linear driving force of the driving link 18 cannot be transmitted to the coupling member 19 as a linear operating force.
In the example shown in FIG. 2, where a fulcrum 23 is fixed and a force point 24 is lowered, an action point roller 25 is strained in such a manner as to bend a coupling member 19b in the indicated direction. When this type of device is used for a long time, those portions of a guide 26 which are depicted as being upper left and lower right portions with reference to a guide hole are likely to be abraded.
SUMMARY OF INVENTION
Accordingly, an object of the present invention is to provide a lever apparatus which is supported at a stationary fulcrum, which employs regulators permitting coupling members respectively connected to the force and action points to linearly reciprocate at all times, and which enables a large force to be transmitted in a desired direction with high precision, and also to provide a machine incorporating the lever apparatus.
According to the present invention, this object is achieved by employing regulators which swing and displace the force and action points of a lever apparatus without reference to the rotational position of the lever apparatus in such a manner that the arcuate loci of the force and action points are converted into linear reciprocating motions easily and accurately.
A machine incorporating the lever apparatus of the present invention (e.g., a pressing machine) comprises: a lever member which is rotatably supported by a stationary fulcrum; regulators including guide members for swinging and displacing the force and action points of the lever member; a driving mechanism, coupled to the lever member, for transmitting a driving force to the force point of the lever member; and a tool section (e.g., a pressing head) coupled to the action point of the lever member and driven in accordance with the movement of the lever member.
The inventor of the present invention developed lever apparatuses wherein a fulcrum is moved in accordance with the rotation of a lever member, and filed patent applications to seek patents for such lever apparatuses. One of the patent applications was PCT international Application No. PCT/JP90/00737 filed on Jun. 6, 1990 (now U.S. Pat.
REFERENCES:
patent: 3367197 (1968-02-01), Tabor et al.
patent: 4317383 (1982-03-01), Kurosaki et al.
patent: 5182967 (1993-02-01), Yoshizawa et al.
"10 Ways to Change Straight-line Direction", Product Engineering, Feb. 29, 1960.
Battista MaryAnn
Bonck Rodney H.
Yoshiki Industrial Co., Ltd.
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