JPH0596706A - Guide of sheets of paper to their guide drum in sheet printer - Google Patents

Abstract

PURPOSE: To enable to transfer sheets with higher bending strength between side segments of a printer without an additional guide means by providing a first bevel gear segment at one side of a sheet guide cylinder shaft and a second bevel gear segment at the other side position which is specularly symmetric with respect to the first bevel gear segment position. CONSTITUTION: A printed sheet 12 is fed to a transfer chain 8 through a take-up cylinder 7, and the transfer chain 8 transfers the sheet 12 to other printer or a sheet ejection device. Usually, the sheet 12, which is guided around the take-up cylinder 7, is likely to be contaminated at the outer casing or support members of the sheet guide members. In this device, however, these sheet guide members are not provided at the take-up cylinder, and a drum shaft 16 is provided with only two segments 13, 14 that can be moved in the axial direction or fixed. In order to transfer the sheet 12 with higher bending strength through the printer without being contaminated, the segments 13, 14 move in the axial direction according to the width of the sheet 12, and also move in the radial direction so that the two edges of the sheet 12 become the same height.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The invention relates to a sheet guide to a sheet guide drum of a sheet printing machine according to the preamble of claim 1.

[0002]

PRIOR ART German Patent Application Publication No. 240
It is known from 9220 to guide sheets from a printing press at the side edges first by means of ring segments with an L-shaped cross section, which ring segments are slightly larger than the respective sheet width. It is arranged on the sheet guide drum loosely and axially displaceable.

This known ring segment can only support axial forces in one direction and is therefore arranged mirror-symmetrically on both ends of the sheet guide drum in order to support one another. No radial forces are supported, so this ring segment is completely unsuitable for supporting sheets. For supporting the sheet, it is additionally necessary to provide sheet guide means known per se with an outer limiting member, for example in the form of a saw tooth, so that the sheet is only in point contact. It only contacts the sheet guide drum or drum jacket. In order to be able to form a regular air flow in the area of the drum, the outer jacket of the drum is provided with a number of holes, not shown, which allow the outflow of the air flow caused by the rotary movement of the drum. Guaranteed. In this known ring segment, the sheet is guided in a cylinder which prevents lateral displacement during its transport to some extent. The additional sheet guiding means provided between the ring segments of L-shaped cross section must have a maximum support width which depends on the thickness and hardness of the sheet material. However, this additional sheet guiding means between the ring segments cannot be dispensed with. If this type of sheet guiding means is used, the sheets must be provided with margins around the edges in order to guide the sheets without soiling. There is a risk of smearing when printing the entire sheet.

[0004]

SUMMARY OF THE INVENTION The object of the invention is to improve the sheet guide to the sheet guide drum of a sheet printing machine so that even sheets with a high bending strength can be placed between a plurality of lateral segments. The purpose is to be able to convey it through a printing press without additional sheet guiding means.

[0005]

The gist of the present invention which has solved the above problems is as set forth in claim 1.

[0006]

It is an advantage of the present invention that a sheet material having a high bending strength up to a predetermined width, for example a carton material or a sheet material having a large bending strength, is fed at its side edges without contamination. It can be guided around the paper guide drum and is guided without rubbing the image of the sheet and without damaging the sheet. This is because there is no additional means for preventing dirt between the outer bevel gear segments.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

The printing apparatus 1 of the sheet-fed rotary offset printing press shown in FIG. 1 is formed in the conventional manner, and comprises a pair of plate cylinder 2 and blanket cylinder 3, and a pair of plate cylinder 4 and blanket cylinder 5. ing. The sheets 12 fed to this printing device 1 come from a sheet feeding device or another printing device in front and are guided around the impression cylinder 6. In that case, the sheet can be printed in two colors. The printed sheet 12 is the receiving cylinder 7
Is delivered to the transport chain 8 and the transport chain 8 transports the sheet 12 to another printing machine (not shown) or a sheet discharge device. A gripper carriage 9 with a suitable known clipper mechanism grips the front edge of the sheet 12 and receives it from the impression cylinder. After the sheets 12 have been delivered to the gripper carriage 9, the gripper carriage 9 is guided around the receiving cylinder 7 and conveys the sheets to a location where they are released. In that case, the back side of the sheet is guided by the curved guide member 10 and the blow box 11.

Conventionally, the sheet 12 guided around the receiving cylinder 7 is easily soiled at the mantle surface of the sheet guide member or at the support member. According to the invention, a sheet guide member of this kind is not provided on the receiving cylinder. 2 on the drum shaft 16
Only one bevel gear segment 13, 14 is arranged so as to be axially displaceable and fixable. In that case, the second bevel gear segment 14 is arranged mirror-symmetrically with respect to the first bevel gear segment 13. The gripper carriage 9 runs into a notch 17 similar to a gutter groove, in a known manner.

Bevel gear segment 13 to drum shaft 16,
The fixing of 14 is performed by a tightening screw 15, for example.

Both bevel gear segments 13, 14 are axially adjusted in accordance with the width of the sheet with high bending strength so that the sheet can be conveyed through the printing machine without contamination.

The bevel gear segments 13, 14 force the side edges of the sheet 12 with a high bending strength into radial positions with the same height. Since the axial force is supported in only one direction, the mirror-symmetrical arrangement of the bevel gear segments 13, 14 provides the opposite support of the sheets 12 and the radial support at an adjusted radial height. Help with.

The maximum support width with which both side edges of the sheet can be guided and supported at the same height, in other words the maximum distance between both bevel gear segments, is determined by the thickness of the sheet material and the bending strength. It must be sized so that at least the sheet 12 does not bend in the widthwise central part, depending on the size.

Although not shown in the drawing, mechanical, aerodynamic or other (eg super blue) additional known sheet guide means are provided on the drum shaft 16 between both bevel gear segments. You can In that case, there is a drawback that the risk of contamination increases as in the conventional case, but on the other hand,
By supporting the center of the sheet, it is possible in some cases to give the sheet a curved and stable shape, which stabilizes the support of the side edges of the sheet on the bevel gear segments 13,14. ..

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment of the present invention.

FIG. 2 is an end view of the bevel gear segment shown in FIG.

FIG. 3 is a plan view showing the bevel gear segment together with the drum shaft of the sheet guide drum.

[Explanation of symbols]

1 printing machine, 2,4 plate cylinder, 3,5 blanket cylinder, 6
Impression cylinder, 7 receiving cylinder, 8 transport chain, 9
Gripper carriage, 10 guide member, 11 blow box, 12 sheets, 13,14 bevel gear segment, 17 notch

Front Page Continuation (72) Inventor Rolf Martin Lange Germany Othufuenbatucha Am Mainhuon-Beering-Schütlerse 30 (72) Inventor Erich Wiegel Germany Germany Miürheim am Main Bejuruger Meister-Heinz-Schutlerse 9 ( 72) Inventor Hans-Jürgen Rott Schuttet Germany Federal Republic of Heusen Schutham Max-Planck-Schutlasse 21

Claims (4)

[Claims] 1. Sheet-fed guide drum (7) for a sheet-fed printing press.
Sheet guide to the sheet guide drum (7),
A sheet of a type in which a plurality of segments for guiding the sheet at its side edges are arranged at a distance slightly larger than the width of the sheet (12) so as to be axially movable and positionally fixable. First on one side of the drum shaft (17) of the guide drum (7)
A bevel gear segment (13) of which a second bevel gear segment (14) is mirror-symmetrically opposed to the other side of the drum shaft (16). 2. A sheet guide to a sheet guide drum of a sheet printing machine, characterized in that the bevel gear segment of FIG. 2. Sheet guide according to claim 1, wherein the bevel gear segments (13, 14) are arranged so as to be axially movable and positionally fixable on the drum shaft (16). 3. Sheet guide according to claim 1, characterized in that the bevel gear segments (13, 14) are fixed in position on the drum shaft (16) by means of tightening screws (15). 4. Both bevel gear segments (13, 14)
Sheet guide according to one of the preceding claims, wherein an additional segment is provided for dirt on the drum shaft (16) in the middle.