EP0608392A1

EP0608392A1 - Sheet feed for printing presses.

Info

Publication number: EP0608392A1
Application number: EP93915751A
Authority: EP
Inventors: Karl-Heinz Filsinger
Original assignee: Heidelberger Druckmaschinen AG
Current assignee: Heidelberger Druckmaschinen AG
Priority date: 1992-08-28
Filing date: 1993-06-30
Publication date: 1994-08-03
Anticipated expiration: 2013-06-30
Also published as: JP2996728B2; AU4562193A; ATE143906T1; DE4228616C2; DE59304124D1; DE4228616C1; WO1994005575A1; US5538238A; JPH07500803A; EP0608392B1

Abstract

PCT No. PCT/EP93/01684 Sec. 371 Date Jun. 28, 1994 Sec. 102(e) Date Jun. 28, 1994 PCT Filed Jun. 30, 1993 PCT Pub. No. WO94/05575 PCT Pub. Date Mar. 17, 1994A sheet feed for printing presses, in particular for offset presses, has a pile table located between feed side walls. The pile table receives a pile of sheets thereon and it is vertically movable with a main pile lifter. An auxiliary pile lift is provided for uninterrupted sheet delivery when a new pile of sheets is inserted. The auxiliary pile lift has non-stop rails for inserting non-stop rods supporting a residual sheet pile. One vertically movable lift component of the auxiliary pile lift, which is separate from the main pile lift, is disposed on each of the outsides of the two feed side walls. The non-stop rails-optionally together with the lift components-form a frame, which surrounds the feed side walls -or at least portions thereof-on the outside.

Description

Sheet feeder on printing machines

DESCRIPTION

The invention relates to a sheet feeder on printing machines, in particular offset printing presses, with a stacking table located between feeder side elements, vertically displaceable by means of a main stacking lifting device for receiving a sheet stack and with an auxiliary stack lifting device for uninterrupted sheet feeding when inserting a new sheet stack _/ wherein the auxiliary stack lifting device has non-stop rails for assigning non-stop rods or the like carrying a sheet of residual stack.

Sheet feeders on printing presses are used to separate sheets from a stack of sheets and to feed them to the printing unit of the printing press. Since the height of the sheet stack decreases with continuous sheet removal, this is located on a vertically movable stacking table, so that the stacking table can be moved upwards accordingly with decreasing stack height, so that the uppermost sheets remain in the working area of a suction head arrangement, which the sheets are in the sheet stack remove and feed the sheet to the printing press. In order to ensure uninterrupted sheet feeding, a so-called auxiliary stack lifting device is provided which receives the remaining sheet stack l remaining from a sheet stack during the feeding of a new sheet stack. The new sheet stack is inserted below the remaining sheet stack Is and then the remaining sheet stack 1 and the new sheet stack are brought together.

Sheet feeders on printing machines are known in which the stacking table receiving the main stack hangs on support chains which are driven by chain wheels. The suspension chains are suspended via um steering chain wheels r, which on a

REPLACEMENT LEAF arranged above the stack of sheets traverse. This traverse leads to a very high design and limits the view of the paper flow.

So-called compact feeders are therefore also known, in which the design is somewhat lower, since a traverse is not required. Rather, opposite side walls of the feeder are provided, between which the sheet stack is placed on a stacking table. The stacking table is supported by vitri guides that are arranged on the inside of the side walls. At the same time, these vertical guides above the stacking table accommodate lifting slides of an auxiliary stack lifting device, that is to say the main stack lifting device and also the auxiliary stack lifting device use the same vertical guides. However, this has the consequence that the Vert i ka L guides have to be relatively long and therefore up to a corresponding height, since even when the Stape Iti sch-Hubsch L tten are moved far up, an area of the guide for receiving the lift slides Lifting sled must be available for Hi Lfsstape Lhubei direction. Furthermore, it is necessary to bend the non-stop rails attached to the lifting slides of the auxiliary stack lifting device downwards so that the non-stop rods to be placed on them receive the correct working height for the remaining sheet stack L. The relatively high towering guides, however, in turn lead to the disadvantages that also exist for the sheet feeders with crossbeams, that is, the accessibility and the view are hindered; An operator's view of the paper stream on a control panel installed on the side of the operator's side wall is disturbed. The high design also leads to safety problems in accident prevention.

REPLACEMENT LEAF The invention is therefore based on the object of providing a sheet feeder in a compact design which has relatively small height dimensions, has a simple construction and in particular provides free access and insertion options for an operator. This low overall height of the sheet feeder also leads to a consistent machine design, that is to say that feeders and printing units can be matched to the corresponding overall heights of the printing press without the feeder disrupting the machine design due to its construction-related large overall height which is present in the prior art.

This object is achieved according to the invention in that on the outer sides of the two feeder side elements, a vertically movable lifting element of each

Main stack lifting device is arranged separate auxiliary stack lifting device and that the non-stop rails, if appropriate together with the lifting elements, form a frame which comprises the feeder side elements - or at least sections of them - on the outside. According to the invention, the components of the stack stacking device are thus arranged on the outer sides of the feeder rare elements, as a result of which there is complete decoupling from the main stacking device. The feeder side elements are preferably as

Feeder sidewalls trained. The main stack lifting device can, for example, have vertical guides which are arranged on the inner sides of the two feeder side walls. In contrast, guide elements of the vertically movable lifting elements of the auxiliary stack lifting device are provided on the outer sides of the two feeder side walls, so that no mutual hindrance of the main stack lifting device and auxiliary stack lifting device can occur and overlaps of components of the main stack lifting device with components of the auxiliary stack lifting device are possible, which makes possible only a very low overall height of the sheet feeder can be realized. As a result, an unrestricted free

REPLACEMENT LEAF View of the paper flow from the operator's side, in particular from a control panel installed in the area of the feeder. In order to create supports for non-stop rods on the front and on the back of the sheet stack, the lifting elements carry a frame or part of this frame which comprises the feed side walls - or at least sections of them - on the outside. The front and back of this frame represent the non-stop scissors that support the non-stop poles. If the frame does not encompass the entire feeder side walls on the outside, but rather passes through corresponding slots in the feeder side walls, only sections of the An Legerseiwanden are included in the frame. The invention also enables a common machine design, in particular the realization of a feeder shape, which is as contoured and smooth as that of the printing units.

According to a further development of the invention, it is provided that, as already mentioned, the lifting elements can be mounted in guides which are fastened to the outer sides of the feeder side elements. These are preferably roller guides, the rollers being supported on the lifting elements and running in guide rails fastened to the outer sides of the feeder side elements.

It is advantageous if the lifting elements are fastened to support chains which are driven by means of chain wheels arranged on the outer sides of the feeder side elements. At least one of the sprockets of each feeder side element forms a drive sprocket and the other sprockets are designed as deflection sprockets for the associated support chain. The two drive sprockets of the two feeder side elements are preferably arranged in a rotationally fixed manner on a common drive shaft. This is in drive connection with a drive, in particular an electric motor. After further training

REPLACEMENT LEAF The invention provides that on the side of the sheet feeder facing the printing press, the associated section (front non-stop rail) of the frame penetrates openings in the feeder side walls. This ensures that the front non-stop rail comes to lie in front of the corresponding side of the sheet stack, that is to say between the sheet stack and the printing unit of the printing press.

On the side of the Bogenaus Legers facing away from the printing press, the assigned section (rear non-stop rails) of the frame is designed to be removable. This gives unrestricted access when the rear non-stop rail is removed.

The rear non-stop ski is preferably U-shaped, with its two legs extending approximately parallel to the outer sides of the feeder side walls. The web located between the two legs of the U-shaped rear non-stop ski extends over the end faces of the feeder side walls. Therefore, no breakthroughs are required in the feeder side walls.

It is advantageous if the outer sides of the feeder side walls are covered by covers which have front slots for the exit of the legs of the rear non-stop rails. These covers are available for reasons of prevention; they cover the chain drives of the auxiliary stack lifting device. The slots in the covers, which are penetrated by the legs of the rear non-stop ski, are very narrow and narrowly tolerated, so that there is no risk of injury to an operator.

The connection point of the removable rear non-stop rails is preferably to the rest of the frame

REPLACEMENT LEAF below or essentially below each cover. As a result, no components protrude from the covers when the rear non-stop rail is removed.

The guides of the lifting elements run up to the upper edge of the feeder side walls. They preferably even end in front of the upper edge, so that the feed side walls complete the sheet feeder without protruding parts or the like. For reasons of a favorable force distribution and to counteract a risk of jamming with a slightly inclined frame, the front non-stop rail is floatingly attached to the remaining part of the frame. The removable rear non-stop rail also allows a certain inclination. The connection point to the side frame elements allows the necessary movement.

The legs of the rear non-stop rails are preferably designed as hollow profiles which can be plugged onto the mandrels of the lifting elements. This makes it easy to remove and insert the rear non-stop rails.

The drawings illustrate the invention on the basis of an exemplary embodiment, namely:

1 is a schematic perspective view of a Bogenan casual,

Fig. 2 is a side view of the sheet feeder and

Fig. 3 is a plan view of the sheet feeder (partially in section).

SPARE BLADE FIG. 1 shows, in schematic form, a sheet feeder 1 of a printing machine (not shown). The sheet feeder 1 has two feed side walls 2 and 3, which are spaced apart and parallel to one another, between which a vertically movable stacking table 4 of a main stacking lifting device 5 is arranged. On the outer sides 6 and 7 of the feeder side walls 2 and 3, components of a auxiliary stack lifting device 8 are arranged which have a frame 9. The frame 9 has a rear non-stop rail 10, which is U-shaped, its two legs 11 and 12 spaced approximately parallel to the outer sides 6 and 7 of the feeder side walls 2 and 3. The web 13 of the rear non-stop rail 10 located between the two legs 11 and 12 engages over the end faces 14 and 15 of the feeder side walls 2 and 3. Furthermore, the frame 9 has a front non-face on the side of the sheet feeder 1 facing the printing press. Stop rail 16 on, the openings 17 and 18 of the feeder side walls 2 and 3 passes through.

A sheet stack 19 can be arranged on the stacking table 4 between the feeder side walls 2 and 3. The support surface 20 of the stacking table 4 has longitudinal recesses 21 which run in the direction of the feed side walls 2 and 3 and which serve to accommodate non-stop rods 22 in the auxiliary stack. The function is discussed in more detail below.

Figure 2 shows a side view of the

Feeder side wall 2 and the components of the auxiliary stack lifting device 8 assigned to this feeder side wall 2. The following description applies in a corresponding manner to the design of the feeder side wall 3 and the parts of the auxiliary stacking stroke device 8 present there, so that it is sufficient to use only the feeder side wall 2 of Figure 2 to he clarify.

REPLACEMENT LEAF On the outside 6 of the feeder side wall 2 there is a roller guide 23 which has a U-shaped guide rail 24 in which rollers 25 of a lifting element 26 of the auxiliary stack lifting device 8 are mounted. The U-shaped guide rail 24 is screwed with its back web onto the outside 6 of the feed side wall 2. The rollers 25 are rotatably supported on the lifting element 26, so that the latter can be mounted vertically up and down on the outside 6 of the feed side wall 2. The lifting element 26 is overlaid along the roller guide 23 by a securing web 27, which is held on the outside 6 of the feeder side wall 2 by means of spacer bolts 28. To the side of the guide rail 24 there is a loading point 28 for a support chain 29 on the lifting element 26, which is placed around chain wheels 30 as a closed loop. One of the chain wheels 30 is located at the upper end laterally next to the guide rail 24. A deflection chain wheel 31 is formed. In the region of the lower end of the roller guide 23 there is another of the chain wheels 30, below the deflection chain wheel 31, which is also designed as a deflection chain wheel 32 ldet is. Another one of the sprockets 30, which is embodied as a deflection sprocket 33, is located at a close distance from it. Finally, the sprocket 30, which forms a drive sprocket 34, is offset laterally in the direction of the printing press toward the deflection sprocket 32. All sprockets 30 are located on the outside 6 of the feeder side wall 2, wherein they are arranged such that the loop of the support chain 29 forms a "double" L-shape. For tensioning the support chain 29, the deflection sprocket 32 is fastened on a slide 35 which can be displaced parallel to the roller guide 23 and can be fixed by means of a screw 36.

Figure 3 shows that the two drive sprockets 34 of the two feed side walls 2 and 3 rotatably on one

REPLACEMENT LEAF common drive shaft 37 are arranged, which lies between the sheet stack 19 and the printing unit, not shown, of the printing press. A servomotor 38 has a sprocket 40 which is connected via an adjustment chain 41 to a sprocket 42 which is arranged on the drive shaft 37 in a rotationally fixed manner. Both the servomotor 38 and the chain wheels 40 and 42 and the Ve rste 11 chain 41 are arranged between the two feeder side walls 2 and 3.

On the inner sides 43 and 44 of the feeder side walls 2 and 3, lifting carriages 45 and 46 are vertically displaceably mounted, which are connected to the stacking table 4 (not shown in FIG. 3), via lifting chains 47 and 48 and other drive and deflection elements (not shown) the lifting carriage 45 and 46 according to the desired

Shift the position of the stacking table 4.

The lifting element 26 has an arm 49 and a holding mandrel 50, the arm 49 extending up to a slot-shaped opening 17 in the feed side wall and the holding mandrel 45 up to the level of the end face 14 of the feed side wall 2. On a he end face 52 of the arm 49, the front non-stop rail 16 is attached in a floating manner. For this purpose, a washer 54 and a sleeve 55 are fastened to the end face 52 by means of a screw 53, the front non-stop rail 16 receiving the sleeve 55 in a bore 56, the diameter of which is larger than the diameter of the sleeve 55. The thickness of the front non-stop rail 16 is smaller than the length of the sleeve 55, so that there is an overall floating connection between the arm 49 and the non-stop rail 16.

Limit switches 57 are arranged in the upper and in the lower region of the slot-shaped opening 51, which are connected to an actuating plate 58 of the front non-stop rail 16

REPLACEMENT LEAF work together. The limit switches 57 switch off the servomotor 38 when the first or the lowest position of the lifting element 26 and thus of the frame 9 is reached.

The rear non-stop rail 10 is designed as a hollow profile 59 which can be pushed onto the mandrel 50 of the lifting element 26. The mandrel 50 has a keel-shaped shape, so that a tilting movement of the hollow profile 59 is possible in such a way that a pin 60 protruding on the mandrel 50 can enter a receiving bore 61 of the hollow profile 59 for removal. By pivoting the hollow profile 59, the pin 60 comes out of the receiving bore 61 and the hollow profile 59, the. That is, the rear non-stop rail 10 can be removed.

The two outer sides 6 and 7 of the feed side walls 2 and 3 are overlapped by covers 62 and 63 which cover the drive elements etc. of the auxiliary stack lifting device 8 and have slots 64 on the end face from which the rear non-stop rail 10 protrudes. The connection point 65 between the rear non-stop rail 10 and the respective lifting element 26 is located under the respective cover 62 or 63.

The sheet feeder according to the invention works as follows:

The starting point is a sheet stack 19 (FIG. 1) inserted between the feeder side walls 2 and 3. The non-stop rods 22 shown there and also the rear non-stop rail 10 are removed. Furthermore, it should be assumed that a suction head device (not shown) takes the sheet of sheet stack 19 lying at the top and, in the direction of arrow 66 (FIG. 1), feeds it to the printing press. This reduces the stack height, which is detected by a sensor that the

REPLACEMENT LEAF Main stack lifting device actuated, whereby the stacking table 4 and thus the sheet stack 19 moves upwards step by step. As soon as there is only a small height of the sheet stack 19, an operator pushes the non-stop rods 22 into the longitudinal recesses 21 and then actuates the auxiliary stack lifting device 8, so that the frame 9 moves upwards and the rear non-stop rail 10 and the front non-stop rail 16 from below against the protruding ends of the non-stop rods 22. In this way, on the non-stop rods 22 there is a residual sheet stack L which, in accordance with the sheet removal, can be tracked by means of the auxiliary stacking device 8 in the course of further operation. At the same time, by actuating the main stack lifting device 5, the stacking table 4 is moved down and a new sheet stack is introduced. This new sheet stack 19 is then raised so that it comes to lie with its top just below the non-stop rods 22. Then the non-stop rods 22 can then be pulled out by the operator, so that a new overall stack is formed. The above explanation shows that this enables an uninterrupted sheet feed.

REPLACEMENT LEAF

Claims

EXPECTATIONS

1. Sheet feeder on printing presses, in particular offset printing presses, with a stacking table located between feeder side elements and vertically movable by means of a main stacking lifting device for receiving egg nes. Bogenstape Is and with an auxiliary stack lifting device for uninterrupted sheet feeding when introducing a new sheet stack, the auxiliary stack lifting device having non-stop rails for assigning non-stop rods or the like carrying a remaining sheet stack l, characterized in that on the outer sides (6, 7 ) of the two feeder side elements (feeder side walls 2, 3) each have a vertically movable lifting element (26) which is separate from the main stacking lifting device (5)

Auxiliary stacking device (8) is arranged and that the non-stop rails (10, 16) -ggf. together with the lifting elements (26) - form a frame (9) which comprises the feed side elements (feed side walls 2, 3) - or at least sections of them - on the outside.

2. Sheet feeder according to claim 1, characterized in that (guide rails 24 ⁾ are mounted on the outer sides (6, 7) of the elements on legersei (feed side walls 2,3) are attached.

3. Sheet feeder according to one of the preceding claims, characterized in that the lifting elements (26) are attached to support chains (29) which are driven by means of chain wheels (30) arranged on the outer sides (6, 7) of the feed side elements (feed side walls 2, 3) .

REPLACEMENT LEAF

4. Sheet feeder according to one of the preceding claims, that the feed side elements are constructed as feed side walls (2, 3).

5. Sheet feeder according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e that at least one of the sprockets (30) of each feeder side wall (2,3) is a drive sprocket (34) and that the other sprockets (30) are deflection sprockets (31,32, 33).

6. Sheet feeder according to one of the preceding claims, that the two drive sprockets (34) of the two feed side walls (2, 3) are arranged in a rotationally fixed manner on a common drive shaft (37).

7. Sheet feeder according to one of the preceding claims, characterized in that on the side of the sheet feeder (1) facing the printing press, the assigned section (front non-stop rail 16) of the frame (9) has openings (17, 18) in the feed side walls ( 2,3) enforced.

8. Sheet feeder according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that on the side of the sheet feeder facing away from the printing machine (1) the associated section (rear non-stop rail 10) of the frame (9) is designed to be removable.

9. Sheet feeder according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t,

REPLACEMENT LEAF that the rear non-stop rail (10) is U-shaped, with its two legs (11, 12) spaced approximately parallel to the outer sides (6, 7) of the feeder side walls (2, 3).

10. Sheet feeder according to one of the preceding claims, characterized in that the web (13) between the two legs (11, 12) of the U-shaped rear non-stop rail (10) has the end faces (14, 15) of the feeder side walls ( 2.3) across

11. Sheet feeder according to one of the preceding claims, characterized in that the outer sides (6, 7) of the feed side walls (2, 3) are covered by covers (62, 63) which have slots (64) on the end face for the exit of the legs (11, 12) ) of the rear non-stop rail (10).

12. Sheet feeder according to one of the preceding claims, characterized in that each connection point (65) of the removable rear non-stop rail (10) to the remaining part of the frame (9) is below or substantially below the cover (62, 63) .

13. Sheet feeder according to one of the preceding claims, that the guides (guide rails 24) of the lifting elements (26) run at most up to the upper edge (67) of the feed side walls (2, 3).

14. Sheet feeder according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t,

REPLACEMENT LEAF that the front and / or rear non-stop rail (16) is attached to the remaining part of the frame (9) in a floating manner.

15. Sheet feeder according to one of the preceding claims, characterized in that the legs (11, 12) of the rear non-stop rail (10) are designed as hollow profiles (59) which can be plugged onto the mandrels (50) of the lifting elements (26) ,

REPLACEMENT LEAF