Railways – Car-carried propulsion system – Electric
Patent
1991-12-12
1993-11-16
Le, Mark T.
Railways
Car-carried propulsion system
Electric
104245, 104296, B23Q 714
Patent
active
052613291
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for transporting workpieces. More particularly it relates to a device for transporting workpieces with a transporting path system for transporting wagons, wherein the transporting wagons have their own traveling mechanisms, and means is provided for controlling the travelling mechanisms and possibly the traveling paths of the transporting wagons. In a known device of this generic type the sensors provided for monitoring the system conformity are directed toward the running surface of the transporting path carrier and, via control means which are arranged downstream, render the blocking of the traveling mechanism ineffective as soon as and as long as they determine the presence of the running surface and a predetermined vertical distance relative to the latter. However, this arrangement is not completely assured because the sensors also cancel the blocking of the traveling mechanism when the transporting wagon is located outside the transporting path on a surface which corresponds to the running surface of the transporting path carrier with respect to material and surface characteristics.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a device for transporting workpieces which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a device for transporting workpieces of the above mentioned general type in which at least one wall surface of the transporting path inquired about by sensor of locking means is provided next a running surface and at an angle relative to the latter at a transporting path carrier.
When the device for transporting workpieces is designed in accordance with the present invention it has the advantage over the prior art that an incorrect diagnosis on the part of the sensors at the transporting cars determining the system conformity is virtually excluded because the sensors actually cancel the blocking of the traveling mechanism only when the transporting wagon is located at a location which conforms to the system and has the characteristics features of the transporting path. The arrangement according to the invention also prevents improper use of the transporting car.
Further advantageous embodiments of the present invention are specified hereinabove.
A simple arrangement results when the wall surface of the transporting path sought by the sensors of the blocking means is formed directly by a supporting surface at the transporting path carrier serving for the lateral guidance of the transporting car.
In this arrangement it is sufficient in itself to provide a single sensor which inquires about the presence of one supporting surface. In a preferred embodiment form, however, at least two sensors are provided at every transporting car, which sensors inquire about two opposite supporting surfaces of the transporting path carrier or carriers. In this case, protection against improper use of the transporting wagons is further increased and the proper condition of the transporting path is also checked to a certain extent.
Inquiring about both supporting surfaces has the further advantage that the desired protective function is also maintained when the operational flow provides for travel of the transporting wagon in both directions and for a turning of the transporting wagons by 180.degree. when the traveling direction is changed (forward travel of the transporting wagons in both traveling directions). In this case it is suggested in a further development of the invention that a free track which is located opposite in a mirror-inverted manner with respect to the longitudinal center plane of symmetry of the transporting path is assigned to at least a part of the function elements at the transporting path carrier which cooperate with function elements at the transporting wagon. Accordingly only the function elements assigned to this traveling d
REFERENCES:
patent: 4275660 (1981-06-01), Forster
patent: 4802622 (1989-02-01), Homan
patent: 4920893 (1990-05-01), Maupu
patent: 5044283 (1991-09-01), Marie et al.
Drexel Peter
Erne Hans
Reitmeier Stefan
Sauer Christian
Schmid Thomas
Le Mark T.
Robert & Bosch GmbH
Striker Michael J.
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