Device for conveying folded signatures

Details Device for conveying folded signatures Device for conveying folded signatures

1999-04-09

2001-01-30

Brahan, Thomas J. (Department: 3652)

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C271S204000

Reexamination Certificate

active

06179111

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a device for transporting folded signatures which are held by controllable grippers. The folded signatures are transported and distributed to a pluarlity of distribution points.
DESCRIPTION OF THE PRIOR ART
A art device is known from WO 96/06032. A ratchet wheel having several control cams is provided for controlling the grippers which are holding signatures. The circumferential speed of the ratchet wheel with the control cams is synchronized with the conveying speed of the gripper chain. The control cams each come slowly into contact from above with the control roller which is assigned to them and slowly push it into an “open position”. An exact delivery of the signatures is not possible in this way, so that the spacing between the scaled or layered signatures becomes irregular. This leads to interruptions of downstream-connected processing machines.
The object of the invention is based on creating a device for transporting and distributing folded signatures removed from a paddle wheel by means of a gripper chain.
In accordance with the invention, this object is attained by providing rotatable control devices which are exactly positioned to open the signature grippers at a desired location. The rotatable control devices have several control cams and can be moved between non-switching and switching positions. The speed of rotation of the control devices can be temporarily greater than the conveying speed of the gripper chain.
The advantages which can be achieved by means of the present invention reside in particular in that a gripper chain which has a simple structure is employed. Short switching times become possible, so that a respectively different distribution point can be provided for each folded signature even at high speeds of the gripper chain. For actuating the gripper mechanism, discontinuously drivable cam disks with several control cams are employed in an advantageous manner, which cam disks are controlled or regulated at exact angles of rotation. The control cams of a cam disk are moved into the movement path of the control roller of the gripper system and are stopped before the control roller reaches the switch location. Thus, the switching process takes place with the cam disk at a standstill. Therefore a “creeping” actuating process is avoided. The path of the gripper chain on its way to the several distribution stations can be kept straight or only slightly curved.


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patent: 3221001 (1982-06-01), None
patent: 0 561 755 (1993-09-01), None
patent: WO 96/06032 (1996-02-01), None

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