Sheet feeding or delivering – Feeding – With means to interrupt feeding
Patent
1988-01-11
1990-03-06
Rolla, Joseph J.
Sheet feeding or delivering
Feeding
With means to interrupt feeding
271 91, B65H 712
Patent
active
049059823
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to a double-blank detecting apparatus for use in a destacker for conveying a plurality of stacked-up sheet shaped blank materials to a working apparatus such as a press machine or the like.
BACKGROUND TECHNIQUE OF THE INVENTION
In a destacker which comprises a plurality of attractor means having vacuum cups or magnets etc. and which are mounted on the body frame in such a manner that they can be moved up and down freely, the attractor means serving to attract sheet-shaped blank materials from the stack one by one, and conveyor means having attracting function for conveying the blank materials to a working apparatus such as a press machine etc., there is a tendency of occurrence of two sheets or more of blank materials being attracted at one time by the attractor means due to the attracting action of oil deposited thereon; that is; so-called "double-blank" phenomenon. If and when the double blanks are conveyed or supplied to the press machine as they are, the metal molds thereof is damaged. Accordingly, it is necessary to detect the double blanks and prevent them from being conveyed to the press machine as they are.
In the prior art double-blank detecting apparatus as disclosed, for example, in Japanese Patent Publication No. SHO54-12671 (AIDA ENGINEERING CO., LTD), there is known an apparatus for detecting the thickness of the blanks by means of a contact type sensor in the course of conveyance or the like.
In such a prior art double-blank detecting apparatus, it is essential to ensure that the contact type sensor is brought into contact with the blank being conveyed. However, the sensor mounting condition in the prior art double-blank detecting apparatus has the following disadvantage. For example, in case of detecting the double-blank in the course of lifting the blank by means of an attractor, a detection error tends to occur because the attractor means and the blank are moving upwards when the detection is made, and further there may occur an error in the contact of the sensor with the blank incidental to the vertical movement of the attractor means thus making it impossible to ensure that the sensor is brought into contact with the blank. Moreover, in case blanks are detected in the course of conveyance of them to a press machine, in order to ensure that the detection is made in a limited space, it is essential to stop the conveyance temporarily and detect the double-blank phenomenon. This will cause a problem on lowering of the working efficiency.
SUMMARY OF THE INVENTION
The present invention has been devised in view of the above-mentioned situation in the prior art apparatuses, and has for its object to provide a double-blank detecting apparatus for use in a destacker, capable of ensuring that a contact type sensor is brought into contact with the blank being conveyed without interrupting the conveyance thereby making it possible to detect double blanks without fail.
To achieve the above-mentioned object, according to the present invention, there is provided a doubleblank detecting apparatus for use in a destacker, comprising a plurality of rows of fixtures, each of the rows of fixtures being parallel with the direction of conveyance of blanks and including a plurality of fixtures, each of the fixtures being mounted on the frame of the destacker in such a manner that it can be moved up and down by means of a light cylinder; attractor means mounted on the fixtures, respectively; and a plurality of rows of conveyor means having attracting function extending in parallel relationship with one another and with the direction of conveyance of blanks and mounted between the rows of fixtures, characterized in that each of the fixtures in at least any one of the rows has a contact type sensor mounted thereon in such a manner that it can be moved up and down freely.
The above and other advantages, manners and objects of the present invention will be apparent to those skilled in the art by having reference to the following description and the accom
REFERENCES:
patent: 2517379 (1950-08-01), Backboase
patent: 3185473 (1965-05-01), Miaskoss et al.
patent: 3194554 (1965-07-01), Hilpman et al.
patent: 4804173 (1989-02-01), Pol et al.
Baba Kiyokazu
Moriyasu Takashi
Kabushiki Kaisha Komatsu Seisakusho
Noland Kenneth
Rolla Joseph J.
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