Dispensing – With discharge assistant – With scraper or wiper for or carried by discharge assistant
Patent
1999-08-23
2000-11-28
Shaver, Kevin
Dispensing
With discharge assistant
With scraper or wiper for or carried by discharge assistant
222326, 222386, G01F 1142
Patent
active
061523348
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an element, a piston and an arrangement for compressing and emptying a bag-like envelope according to the preamble of the independent claims.
Pasty liquids such as printing inks are frequently delivered in flexible bags. These bags may be transported in containers made e.g. from cardboard conforming to the outer shape of the bag. Such a package has been described in EP 723 920. In order to be used in a printing machine, the ink has to be emptied from the bag prior to use.
There is known an arrangement for emptying the bag which comprises a draining can provided with a dispensing aperture. The bag can be put in the can and the pasty liquid may be disposed through a hole in the bag and through the dispensing aperture of the draining can.
Due to the high viscosity of pasty liquids such as printing inks, it may be necessary to exert a certain pressure for emptying a bag. Known arrangements have therefore been provided with a piston which is axially movable within the draining can. The outer edge of the piston conforms to the inner surface of the can. Upon axial downward movement of the piston, the content of the bag placed in the can is compressed and dispensed through the dispensing aperture of the can. When the bag has been emptied, the piston has to be completely removed from the can before putting a new full bag into the can.
This known draining arrangement however has certain drawbacks. On the one hand, the outer edge of the piston has to be in engaging contact with the inner surface of the can in order to prevent the bag from passing in a gap between the outer edge of the piston and the inner surface of the can. If there is a gap between the piston and the inner surface of the can, parts of the bag may pass through the gap and obstruct the removal of the piston. On the other hand, a piston with an outer edge which exactly conforms to the inner surface of the can will be hard to insert into the can. In some cases, the outer edge of the piston is even provided with a resilient element which is slightly larger than the inner surface of the can in order to exert a pressure on the inside surface. In these cases, it is hardly impossible to reintroduce the piston into a can.
DE 42 31 420 discloses a piston for emptying an envelope in a housing. The piston is made flexible and comprises an outer edge which is engagable with the inner surface of the housing. For emptying the envelope, a rod is axially pressed on the piston. The piston is thereby deformed and its outer edge is pressed against the inner surface of the housing. For removal of the piston, the rod is released and the outer edge of the piston gets out of engagement with the inner surface of the housing, due to its elasticity.
It is an object of the present application to avoid the drawbacks of the state of the art, especially to provide a piston and an arrangement with a piston for compressing and emptying a bag-like envelope, which piston may be easily introduced into the can and which comprises an outer edge which is able to be brought in scraping contact with the inner surface of the can.
According to the invention, these objects are solved with a scraping element, a piston and an arrangement comprising the features of the characterizing portion of the independent claims. An axially movable piston for compressing and emptying a bag-like envelope containing a pasty liquid comprises on its outer edge at least one scraping element. The scraping element comprises a scraping edge which is engageable with the inner surface of a rigid outer housing with a discharge opening. The bag-like envelope is put into the housing. The scraping element is movably connected to the outer edge of the piston and is movable between a first insertion position and a second scraping position. In the insertion position, the scraping edge of the scraping element is arranged at a smaller radial distance from the axis of the piston. In the scraping position, the scraping edge is engageable with the inner surface of the housing. When the piston is inserted
REFERENCES:
patent: 3612359 (1971-10-01), Sundholm
patent: 5000355 (1991-03-01), Pritchard
patent: 5577641 (1996-11-01), De Laforcade et al.
patent: 5961007 (1999-10-01), Dornbusch et al.
Liardon Olivier
Sanga Jean-Pierre
Bonderer David A.
Shaver Kevin
Sicpa Holdings S.A.
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