Sheet feeding or delivering – Delivering – With transfer means between conveyor and receiver
Reexamination Certificate
2000-03-29
2001-08-14
Ellis, Christopher P. (Department: 3651)
Sheet feeding or delivering
Delivering
With transfer means between conveyor and receiver
C271S195000, C271S204000, C271S211000
Reexamination Certificate
active
06273417
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a delivery for a sheet processing printing machine having a delivery housing and a sheet conveyor that is substantially enclosed by the delivery housing. The delivery housing is also formed with an opening at the underside thereof through which, operationally, the sheets leave the delivery housing for forming a sheet pile or stack. A suction line wherein a negative pressure operationally prevails is also connected to the interior of the delivery housing. The delivery is usually surrounded by a sheet processing printing machine.
A delivery of the foregoing general type has become known heretofore from the published German Patent Document DE 195 01 874 A1, for example. Air flows from different sources prevail in the delivery housing of this well-known delivery. Normally, the sheet conveyor includes revolving endless conveyor chains and gripper systems carried thereby which are located in the vicinity of the outer wall of the delivery housing. The conveyor chains and grippers transport a sheet from one processing station to the vicinity of the opening in the underside of the delivery housing, and release the sheets to form sheet piles, after which the gripper systems return to the processing station. The gripper systems generate a drag air flow along the path they traverse, the air flow reaching especially into the region of the opening.
The gripper systems usually carry the sheet over an air cushion formed between them and a sheet gliding surface, the cushion being generated by air blown into the delivery housing. This air also generates an air flow that reaches the opening of the delivery housing.
To avoid collisions of the sheets released for forming a sheet pile, blowing or blasting devices are normally provided above the opening formed in the delivery housing for increasing the descent speed of the sheets released for pile formation or stacking. The blast air is directed directly to the opening.
As has become known heretofore from U.S. Pat. No. 5,265,536, for example, the sheets transported to the stacking or pile forming station are dusted with powder on the way to prevent the freshly printed sheets from sticking together. However, the total amount of the powder released from the dusting device will not stick to the sheets; instead, a cloud of stray powder develops which is then carried in the direction of the delivery housing opening by the hereinaforedescribed air flows.
In order to suck the stray powder from the delivery housing, a suction line having an operationally prevailing negative pressure therein is connected to the interior of the delivery housing, for such conventional deliveries. The suction line communicates in different ways with the interior of the delivery housing. In the aforementioned heretofore known deliveries, a suction opening is provided, for example, in an upper housing wall, for example, of the delivery, whereas in the delivery heretofore known from the German Utility Model DE 298 05 248 U1, the delivery is connected with a suction line located at the suction opening arranged at the side of the path traversed by the sheets.
The aforedescribed deliveries have in common that the air flows loaded with powder cannot be prevented from escaping out of the opening. Such air flows are generated by blast or blowing devices which accelerate the descent of the sheet released for stacking or sheet piling. In addition, enormous suction power is required to prevent the remaining air flows in the delivery housing from leaving the opening.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a delivery for a sheet-processing printing machine with the task of keeping the surroundings thereof virtually free of powder.
With the foregoing and other objects in view, there is provided, in accordance with one aspect of the invention, a delivery for a sheet processing printing machine having a delivery housing and a sheet conveyor substantially enclosed by the delivery housing, the delivery housing being formed with an opening at the underside thereof through which, operationally, sheets leave the delivery housing for forming a sheet pile, and a suction line connected to the interior of the delivery housing, the suction line having a negative pressure prevailing operationally therein, comprising motor-driven fluid flow machines for acquiring the air flows leaving the delivery housing through the opening and for generating air flows returning into the delivery housing.
In accordance with another feature of the invention, the fluid flow machines are axial blowers.
In accordance with a further feature of the invention, the delivery includes flow shafts disposed for separating from one another the air flows leaving through the opening, and the air flows returning into the delivery housing.
In accordance with a concomitant aspect of the invention, there is provided a sheet processing printing machine assembly comprising a sheet processing printing machine, and a delivery having a delivery housing and a sheet conveyor substantially enclosed by the delivery housing, the delivery housing being formed with an opening at the underside thereof through which, operationally, sheets leave the delivery housing for forming a sheet pile, a suction line connected to the interior of the delivery housing, the suction line having a negative pressure prevailing operationally therein, and motor-driven fluid flow machines for acquiring the air flows leaving the delivery housing through the opening and for generating air flows returning into the delivery housing.
Motor-driven fluid flow or air turbo machines are provided for solving this task; the machines acquire air flows coming from the opening and generate air flows returning into the delivery housing.
In contrast with the current state of the art, this solution does not prevent the air laden with powder from escaping out of the opening, but rather, such escape is permitted in that the air flows discharging from the opening are hindered from spreading the powder into the surroundings of the delivery. The German Utility Patent (DE GM) 91 15 032 suggests that suction pieces or nozzles be grouped in an upper region of a sheet pile formed by the sheets and connected by a suction aggregate, so that this constellation also requires an enormous suction power of the suction aggregate. Keeping the air in the surroundings of the delivery clean can only be accomplished with the arrangement suggested by this reference at the price of a clearly reduced performance.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a delivery for a sheet processing printing machine, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, wherein:
REFERENCES:
patent: 3556519 (1971-01-01), Keller
patent: 4026542 (1977-05-01), Stange et al.
patent: 4033579 (1977-07-01), Stange et al.
patent: 4225129 (1980-09-01), Zimmermann et al.
patent: 4405125 (1983-09-01), Kulpa et al.
patent: 4479645 (1984-10-01), Pollich
patent: 5222726 (1993-06-01), Vits
patent: 5259608 (1993-11-01), Pollich
patent: 5265536 (1993-11-01), Millard
patent: 5816155 (1998-10-01), Stephan
patent: 195 01 874 A1 (1996-07-01), None
patent: 195 03 110 A1 (1996-08-01), None
Berlingen Detlev
Heller Bernd
Bower Kenneth W
Ellis Christopher P.
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
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