DD218339A1 - RETROFITERS IN BOWERS OF BOW PRINTING MACHINES - Google Patents

Abstract

The invention relates to a Nachgreifer in sheet delivery of sheetfed presses, with which the bow gefoerdert means of arranged on an endless chain gripper carriage on the delivery pile, released, detected by Nachgreifern and can be stored aligned on the sheet stops after the leading edge. The object of the invention to provide a Nachgreifer in sheet delivery, can be stored properly in the corner areas of the leading edge in Schoen- and reverse printed sheets without the Nachgreifer the corner areas smeared, is solved by the nachgreifer perpendicular to Bogenfoerderrichtung on the corner regions of the sheet leading edge facing Blasduesen are arranged. Fig. 1

Description

Nachgreifer in sheet delivery of sheetfed presses

Field of application of the invention

The invention relates to a Nachgreifer in sheet delivery of sheetfed presses, with which the bow gefoerdert means of arranged on an endless chain gripper carriage on the delivery pile, released, detected by Nachgreifern and can be stored aligned on the sheet stops after the leading edge.

Characteristic of the known "technical solutions

Such Nachgreifer is known from DE-PS 1 216 325. According to this document, the sheet is conveyed by the gripper carriage over the delivery pile of the sheet delivery and taken over by a swinging Nachgreifer from the gripper carriage and delayed placed on the delivery pile

 The Nachgreifer works with pneumatic means, d. h., the

Arc is supplied with suction air,

In order to avoid sagging the corners of the leading edge of the sheet during the promotion by the Nachgreifer ₉ are arranged on the Nachgreifern brackets that follow the movement of the Nachgreifer and prevent hanging down the corners of the sheet. A disadvantage of this solution is that the bow must be pulled out from under the bow when the bow is attached to the front catch. As a result, there is a risk of reversible or b / w-stitched sheets printed in full-face and reverse printing.

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that the guide bar smeared the pressure on the lower side of the sheet due to the relative movement between the sheet and the guide bar, "

Another disadvantage is the fact that the brackets are not applicable to alternately working Nachgreifern (only to the outer Nachgreiferpaar).

At high speeds, however, the clips have the disadvantage that they oscillate.

Object of the invention

It is an object of the invention to provide a Nachgreifer in sheet delivery, even on machines that can edit the bow in Schoen- and reverse printing, the proper storage of the bow allows.

Object of the invention

It is an object of the invention to provide a Nachgreifer in sheet delivery, can be stored properly in the corner areas of the leading edge geschogengemaess printed in Schoen- and reverse printing sheet _} without the Nachgreifer the corner areas smeared.

Essence of the invention

The advantage of the solution lies in the avoidance of the effect that the hanging corner of the sheet previously smeared the fresh ink on the ' dropped sheet.

The advantage of. Invention over the known Nachgreifern is mainly that

1. The support of the corner of the sheet is non-contact and thus can also be applied for fulling and perfecting.

2. The assistance of the corner of the sheet is also possible with alternately working Nachgreifern,

3. The supporting means work vibration-free even at high speeds,

4. Adjustments are not required for Pormat adjustment.

Exemplary embodiment of the invention

Reference to a Ausfueurungsbeispieles will be described in more detail below the invention. ^! In the drawings shows:

1: side view of the gripper on the sheet delivery * FIG. 2: front view (top view) of the delivery stack FIG. 3s front view according to FIG. 2 with blowing duese from above _} acting;

Fig. 1 and Fig. 2 show a sheet delivery with a sheet stack 1, a chain circle 2 and arranged on the chain circle 2 gripper carriages 4. In the area of the front Anschlaege 5 of the sheet stack 1 Nachgreifer 6 are arranged, which are each mounted on a support arm 7 ,

The support arm 7 also has the puncture of a coupling in the four-bar linkage 9 _S 9% 12, 7 of the Wachgreiferantriebea. Sitting on the axis 8 per Nachgreifer 6 two angle lever 9, 9% in the upper end rollers 10, 10 «rotatably support the cams 11, 11 ^s run _{e e} The rollers 10, 10 ^f are in a known manner by springs, not shown The control cams 11, '11 »pressed The angle lever 9 ¹ is pivotally connected at its other end to the support arm 7, A lever 12 provides the connection between the support arm 7 and the angle lever 9 ago, the distances of the opposite sides of the four-bar mechanism are the same to always ensure a nearly horizontal position of the support arm 7. The cams 11, 11 ^f sit firmly on the tour shaft 13, which gets its drive by known, not shown means. For application one, _nine two or more Nachgreifer "couples come," Here are each Nachgreifer 6 a four-bar linkage 9, 9 ', 12 _$ 7 and two control cams 11, 11 »assigned as drive,

At Nachgreifer 6 Blasduesen 24 are fixed. The taps H have with their opening on the corner regions of the sheet leading edge 15 '»

The post-gripper 6 can work as a clamping gripper or vacuum cleaner ", wherein the means for generating the holding force (mechanically or pneumatically) were known and not shown. In the exemplary embodiment, post-gripper 6 was shown as a suction gripper (see Fig. _E ).

In Figo 2, the Blasduesen H are arranged on the Nachgreifer 6, that the Blasstrahl H ¹ can act from below on the sheet 15.

Gemaess.Ausfuehrungsbeispiel of Figure 3 _e H tuyeres are so attached to the Nachgreifer 6 that the blowing jet 14 'can act from above on the sheet 15 ,,

The operation of the sheet delivery is described below "

The sheet to be deposited 15 is transported by means of the gripper carriage A over the sheet stack 1 and there to the Nachgreifer. 6

pass, which are already immersed in the pile area, take over the sheet "and transport it to the front stops, where they put it aligned on the sheet pile 1.

During the transport from the takeover to the storage, the corner areas of the front edge 15 'of the arch 15 are under the action of the blower nozzles 14 whose blowing jet HV is directed parallel to the sheet plane on the sheet leading edge 15', supports them from below or at the top and in an almost horizontal position holds. This is done according to the exemplary embodiment of Pig. 2 (Blasduese 6 acting from below) by building an air cushion under the corner regions of the sheet leading edge 15 'and geraaess Ausfuehrungsbeispiel of FIG. 3 (Blasduese 6 from above) by generating a negative pressure above the corner regions of the sheet leading edge. 6

Claims (3)

Erfindungsansprueehe 1 _β Nachgreifer in sheet delivery of sheet-fed presses with which the sheet is taken from the gripper carriage and conveyed to the Anschlaege on the sheet stack and where means are provided to support the corner regions of the sheet leading edge, characterized in that at Nachgreifer (6) perpendicular to Bogenfoerderrichtung on the corner areas of the sheet leading edge (15 ') facing Blasduesen (15) are arranged, 2. Nachgreifer according to item 1, characterized in that the Blasduesen (H) via the Nachgreifer (6) are arranged, 3. Nachgreifer according to item 1, characterized in that the Blasduesen (H) under the sheet (15) acting on Nachgreifer (6) are arranged. For this t page