Device and method for separating printed products out of a stack

Abstract

The invention relates to a device for separating printed products (2) out of a stack (77). The device has a moving equipment (5) used for separating printed products (2) and a post-positioned conveying equipment (4) used for conveying the separated printed products (2); wherein the moving equipment (5) and the conveying equipment (4) respectively has a transmission mechanism (42, 43) which rotate independently of each other. Thereby the moving equipment (5) and the conveying equipment (4) are rotated and driven independently of each other; and the printed products (2, 2a, 2b, 2c) are accelerated to a first speed in the moving equipment (5), and are accelerated to a second speed which is higher than the first speed in the conveying equipment (4).

Description

technical field [0001] The invention relates to a method and a device for separating printed products from a stack, the device having a moving device for separating printed products and a downstream conveyor device for conveying the separated printed products. Background technique [0002] In order to separate printed products from the magazine, in particular those with a thickness of more than about 2 mm bound for a perfect binding, so-called sliding feeders are usually used, which consist of a mobile device and a subsequent conveying device. With this technique, the separation efficiency is limited due to the relatively large mass to be moved through a corresponding stroke of the mobile device. Interfering streaks also appear on these printed products due to the jump in speed of the printed products as they are transferred from the mobile device to the conveyor device. [0003] A separating device is known from DE 1247266, with which a book or paperback is output from a s...

AI Technical Summary

Problems solved by technology

The mass to be accelerated is relatively large, which also makes the frame of the device have to withstand excessive forces

Furthermore, pairs of take-off rollers that are fixedly adjusted relative to each other are not suitable for the processing of perfect-bound catalogs with coated backs.

Finally, there is a risk of the remaining stack tipping over to one side when separating the lowermost printed sheet

[0008] The problem with these known solutions is that the movement during the movement is predetermined, so that the acceleration of the printed product cannot be optimized for efficient separation

In addition, the speed situation at the point of transfer, especially when the product is transferred from the mobile gantry to the conveyor rollers, is unfavorable, so that the quality of the printed product is often compromised

Since the movement conditions predetermined by this mechanism are fixed, it is not possible to adapt the movement to the corresponding format of the printed products to be separated

The remaining stack slides uncontrollably on top of each other, causing the problem that the printed products get stuck in the storage drum, which prevents a process-reliable separation

Solutions that allow flexible specification of the motion profile and output speed of the mobile gantry require expensive drive trains with power and control lines moving together, however this is not suitable for high efficiency e.g. more than 15000 jobs per hour Persistence of the cycle

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