Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part
Patent
1994-10-28
1996-09-24
Crane, Daniel C.
Metal deforming
With use of control means energized in response to activator...
Sensing tool or tool-linked part
7240511, 72451, 74569, B21D 4305
Patent
active
055579582
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP93/00591, filed Apr. 30, 1993.
TECHNICAL FIELD
The present invention relates to a dynamic balancer circuit of a transfer feeder.
BACKGROUND ART
A transfer feeder equipped for a conventional transfer press is provided with a pair of transfer bars in a feeding direction, and a work is carried in and out to and from a press by the transfer bars, through the operation thereof in a two-dimensional or three-dimensional direction in synchronism of the transfer bars with the press, to thereby carry out the conveyance between respective working stations.
The transfer feeder is also provided with a driving mechanism for driving the transfer bars in the two or three dimensional direction, and a camshaft driven by power taken out of the press is provided for the driving mechanism. To the camshaft are mounted a feed cam and a lift cam by which a feed lever and a lift lever are swung through cam followers, respectively, whereby the transfer bars are driven in the two-dimensional direction or three-dimensional direction.
In the conventional transfer feeder of the structure described above, a rear cushion cylinder composed of an air cylinder is utilized for pushing the cam follower of the feed lever to the feed cam, and an air pressure to be supplied to the rear cushion cylinder is set to the maximum value necessary in consideration of the condition that a weight of a movable member is generally subjected to the maximally accelerated speed at the maximum production speed (maximum operation speed) of the press.
For the reason described above, in the described conventional transfer feeder, a pushing force at the maximum production speed is applied to the feed cam through the cam follower even in a case where the production speed (operation speed) of the press does not reach the maximum production speed, resulting in an early reduction of the lifetime of the driving system of the transfer feeder and an increase of power consumption, thus being inconvenient.
Therefore, an object of the present invention is to provide a dynamic balancer circuit of a transfer feeder capable of controlling a pushing force of a rear cushion cylinder to an optimum value in response to a production speed of a press to thereby improve the lifetime of a driving system and to reduce the power consumption.
DISCLOSURE OF THE INVENTION
In order to achieve the above and other objects, according to a first structure of the present invention, there is provided a dynamic balancer circuit of a transfer feeder in which transfer bars are driven in a feeding direction by swinging a feed lever by a feed cam mounted to a camshaft rotated by power taken out of a transfer press, wherein a control circuit is provided for controlling an air pressure of a rear cushion cylinder pushing the feed lever to the feed cam through a cam follower to an optimum value in response to a production speed of a press.
According to this structure, since the pushing force of the rear cushion cylinder does not exceed a necessary value, the lifetime of the driving system can be improved and power consumption can be reduced.
Further, it will be desired that the optimum value accords with the minimum value that is necessary.
According to a second aspect of the present invention, there is provided, in addition to the above first structure, a dynamic balancer circuit of a transfer feeder wherein the aforementioned control circuit at least comprises a press speed detection sensor, an electromagnetic valve unit disposed between an air supply source and the rear cushion cylinder, and a sequencer for controlling the electromagnetic valve unit in response to the production speed of the press detected by the press speed detection sensor on the basis of a program preliminarily set in accordance with a kind of a work.
According to a third aspect of the present invention, there is provided, in addition to the above second structure, a dynamic balancer circuit of a transfer feeder, wherein the aforementioned control circuit is provided with an air pressure de
REFERENCES:
patent: 3413862 (1968-12-01), Waara
patent: 3875808 (1975-04-01), Okamoto
patent: 4436199 (1984-03-01), Baba
patent: 4655097 (1987-04-01), Suzuki
Nishida Kenji
Shiroza Kazuhiko
Crane Daniel C.
Kabushiki Kaisha Komatsu Seisakusho
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