Sheet feeding or delivering – Feeding – With means to align sheet
Reexamination Certificate
2000-03-10
2002-09-24
Skaggs, H. Grant (Department: 3653)
Sheet feeding or delivering
Feeding
With means to align sheet
C271S240000, C271S263000
Reexamination Certificate
active
06454256
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a device for laterally aligning sheets on a feeding table of a sheet-processing machine with a device for detecting multiple sheets.
In sheet-processing machines, particularly sheet-fed rotary printing machines, a problem arises wherein the sheets which are to be aligned laterally become positioned obliquely during the lateral pulling movement.
In order to solve this problem, it has become known heretofore from the published German Patent Document DE 35 36 533 A1 to arrange a holding or retaining roller at an intersection point of the center of the feeding table and the direction in which a lateral pulling device acts, and to provide this holding or retaining roller with a device for detecting multiple sheets.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide an improved device for laterally aligning sheets, wherein devices for detecting multiple sheets are provided.
With the foregoing and other objects in view, there is provided, in accordance with the invention, a device for laterally aligning a sheet on a feeding table of a sheet-processing machine, wherein a sheet is moved transversely to the sheet-transporting direction by a pulling device, and a multiple-sheet detecting device activatable during the pulling operation is assigned to the pulling device, comprising another pulling device disposed opposite the first-mentioned pulling device, and a pressure-exerting roller with multiple-sheet monitoring assigned to each of the pulling devices, respectively, for sheet stabilization.
In accordance with another feature of the invention, both pressure-exerting rollers with multiple-sheet monitoring are activatable when one of the two pulling devices is activated.
In accordance with a further feature of the invention, upon activation of one of the pulling devices, the respective pressure-exerting roller with multiple-sheet monitoring disposed on the opposite side of the sheet from the respective one pulling device is activatable.
In accordance with a concomitant feature of the invention, the aligning device includes a respective, freely rotatably mounted counter-roller cooperating with each of the pressure-exerting rollers, respectively.
An advantage derived from the invention is that the device for detecting multiple sheets executes a holding or retaining function and, for this purpose, is arranged at an especially desirable retaining or holding location, namely at the side of the sheet, respectively, that is located opposite the pulling device.
Due to this measure, only very small holding or retaining forces have to be expended in the sheet-transporting direction in order to achieve parallel guidance for the sheet during the lateral alignment.
The arrangement of two lateral pulling devices allows the sheets to be aligned both at lefthand lateral stops and at righthand lateral stops. Arranging two multiple-sheet monitoring devices in the region of the lateral pulling device ensures the detection of bent-over or dog-eared sheet corners in addition. to double and multiple sheets.
In order to improve the sliding properties of the sheet during the lateral alignment, the multiple-sheet monitoring device or control has a pressure-exerting roller that cooperates with a freely rotatably mounted counter-roller.
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 device for laterally aligning sheets, 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: 3593989 (1971-07-01), Crittenden
patent: 4245836 (1981-01-01), Jooster
patent: 4879513 (1989-11-01), Spiegel et al.
patent: 5267728 (1993-12-01), Simeth
patent: 1 015 009 (1957-09-01), None
patent: 22 00 187 (1972-08-01), None
patent: 29 21 842 (1980-12-01), None
patent: 3536533 (1986-05-01), None
patent: 2175 573 (1986-12-01), None
Boguhn Hans Peter
Möhringer Markus
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Mayback Gregory L.
Skaggs H. Grant
Stemer Werner H.
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