Parts send-out control device for vibratory parts feeder

Details Parts send-out control device for vibratory parts feeder Parts send-out control device for vibratory parts feeder

1999-06-16

2001-04-03

Bidwell, James R. (Department: 3651)

Conveyors: power-driven

Conveyor having impinging fluid to feed, shift or discharge...

C406S075000

Reissue Patent

active

RE037120

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a parts send-out control device for a vibratory parts feeder to be used in the field of sending out parts such as projection nuts from the vibratory parts feeder.
BACKGROUND ART
As hitherto known, parts coming into the send-out passage of the vibratory parts feeder are sent out by force using jet air, and in this case the parts feeder is vibrating continuously.
In such constitution, the parts are continuously transferred from the bowl of the parts feeder into the send-out passage since the parts feeder is always vibrating, so that an excessive number of parts are accummulated ahead of the air nozzle, and hence they cannot be sent out completely with the jet force at the beginning of the air ejection.
DISCLOSURE OF THE INVENTION
The invention is contemplated to solve the above problem, being characterized by an air nozzle for ejecting conveying air in a send-out passage of a vibratory parts feeder, and a part detection sensor disposed in the send-out passage near the air nozzle, wherein the vibratory motion of the parts feeder is stopped and the conveying air is ejected from the air nozzle in response to a part detection electric signal transmitted by the part detection sensor. As a part sent into the send-out passage passes through the part detection sensor, it is detected and an electric signal is transmitted. Consequently, the vibratory parts feeder is stopped to suspend entry of parts into the send-out passage, and at the same time the conveying air is ejected to the part from the air nozzle toward that part, which is sent out to the desired position.
According to the invention, the part detection sensor is installed in the send-out passage near the air nozzle, and the air is ejected in response to the part detection signal from the part detection sensor, while the vibration of the parts feeder is stopped at the same time. Thus, the number of parts positioned ahead of the air nozzle can be limited so that the number does not exceed the air conveying capacity, ensuring the parts being sent out reliably.
The send-out passage is continuously installed at the terminal end of the spiral passage, and an air nozzle is attached to the end portion of the send-out passage. Hence the structure of the send-out portion of the bowl is simplified, and the direction of jet air can be set securely. Moreover, the air hose and part detection sensor are attached through the bracket welded to the tube member and the outer side of the bowl, resulting in the structure compact and functional.
According to another aspect of the invention, the send-out passage has a vent for allowing the air in the send-out passage in front of the parts to go out. The vent has silencing means, so that the jet air flow out of the vent is silenced by the silencing means.
When the silencing means is composed of porous permeation resisting member, not only resistance is given to the air jet to silence, but impurities such as oil and iron chips are captured by the porous member, and hence these impurities do not scatter outside, which is beneficial also from the viewpoint of sanitation of the working environments.
By thus installing silencing means at the vent of the send-out passage, any noise that would otherwise be made at the vent can be prevented. Being silenced by the silencing action of the porous sound absorbing member, wool-like sound absorbing material, expansion box, or conduit resistance by silencing hose, it is effective for improvement of working environments. Still more, the jet flow out of the vent is relaxed, and the air flow does not collide against the human body, and cold feel is avoided. As the oil, iron chips and other impurities are captures by the permeation resisting member, environmental contamination is prevented.


REFERENCES:
patent: 4641741 (1987-02-01), Oura
patent: 5083654 (1992-01-01), Nakajima et al.
patent: 60-112522 (1985-06-01), None
patent: 60-173517 (1985-11-01), None
patent: 4-77518 (1992-07-01), None

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