Sheet feeding or delivering – Feeding – With means to align sheet
Reexamination Certificate
1997-05-05
2001-07-24
Skaggs, H. Grant (Department: 3651)
Sheet feeding or delivering
Feeding
With means to align sheet
C271S082000, C271S277000, C271S226000, C271S249000
Reexamination Certificate
active
06264196
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a method and a device for laterally aligning a sheet, more particularly, by an axially displaceable sheet gripper device on a cylinder or a drum of a sheet-processing machine, having a control roller and a cam disk cooperating with the control roller at an end face.
The published German Patent Document DE 36 44 431 A1 discloses a cam disk which is mounted on a side frame so that it can pivot in the axial direction of a cylinder carrying sheet grippers. An adjusting movement is produced by an adjusting motor and adjusting gearing connected downstream of the latter. The cam disk is respectively pivoted only to the extent which is intended to correspond to the axial displacement of a carriage.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method and a device for an axial adjusting movement of a sheet gripper device, wherein a cam disk is arranged in a stationary manner, which provides a considerable improvement over the state of the art.
With the foregoing and other objects in view, there is provided, in accordance with one aspect of the invention, a method for laterally aligning a sheet in a sheet-processing machine, the sheet being retained by sheet grippers which are displaced axially on a common carriage with respect to an alignment cylinder, which comprises fixing the carriage when it reaches a predetermined desired position.
In accordance with another mode, the method of the invention includes axially displacing the carriage and the sheet retained thereon with respect to the alignment cylinder, from a given position, until a sensor identifying a desired position emits a signal to fix the carriage, and then fixing the carriage.
In accordance with a further aspect of the invention, there is provided a device for laterally aligning a sheet by an axially displaceable sheet gripper device on a cylinder or a drum of a sheet-processing machine, having a control roller and a cam disk cooperating with the control roller at an end face, comprising a carriage to which the sheet gripper device is fastened, and a braking system by which the carriage is fixable with respect to the alignment cylinder.
In accordance with another feature of the invention, the braking system includes a strip and two activatable brake blocks for clamping the strip.
In accordance with a further feature of the invention, the carriage is axially displaceably mounted in a cylinder gap formed in the sheet alignment cylinder.
In accordance with an added feature of the invention, the cam disk is mounted fixedly on the frame and has a control contour within an effective range of a control roller.
In accordance with an additional feature of the invention, the aligning device includes a sheet lateral position detection system connected to the braking system.
In accordance with yet another feature of the invention, the device includes a first spring element for producing at least one of a restoring movement and a deflecting movement of the carriage.
In accordance with a concomitant feature of the invention, the control roller is displaceable with respect to the carriage, the control roller being displaceable counter to a force of a second spring element.
The advantage of the invention resides, in particular, in the fact that a sheet to be transported can be aligned laterally even at high processing speeds. In an advantageous manner, braking of the lateral movement of the gripper carriage can be performed significantly faster than driving to a desired position by an adjusting motor. Sensors which are provided for the detection of the sheet side positions are integrated in the alignment cylinder. By this measure, the actual lateral position (nominal value) of the sheet in relation to the cylinder is measured.
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 a method and device for laterally aligning a sheet, 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:
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patent: 5219159 (1993-06-01), Malachowski et al.
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patent: 3311196C2 (1987-07-01), None
patent: 3644431A1 (1988-09-01), None
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
Skaggs H. Grant
Stemer Werner H.
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