DE10325853B4 - Weighing device for rolls of material in rotary printing machines - Google Patents

Abstract

weighing System (14) for Material rolls (2) for rotary printing presses, a movable lifting frame (5) having, by means of weighing the roll of material (2) this from the transport device (1) can be lifted, that the lifting movement by means of at least one lifting device (7) that takes place between the lifting frame (5) and the lifting device (7) at least two measuring sockets (9) are arranged to determine the weight so that the measurement directly at the site of action.

Description

The The invention relates to a weighing device for rolls of material in rotary printing machines according to the preamble of claim 1.

The DE 196 11 177 A1 shows a weighing device in a Auspackstation, used in roll feed systems for paper rolls in rotary printing presses, on each of which at the corners of the complete unit, a load cell is arranged.

disadvantage is that the weighing device is created by the need of four load cells, and the associated expensive electronics costly is, being about it In addition, an inaccurate measurement due to the difficult calibration of the entire system results. The four load cells are attached directly to the foundation frame of the unpacking station, thereby is the risk of destruction or damage the load cells by bracing and assembly errors very large.

From the US 5,308,217 A is also a weighing device with four load cells for material webs known.

Of the Invention is the object of the above-mentioned disadvantages eliminate and create a weighing device, which is a weighing achieved by material rolls with simple means, the weighing device cost-effective, functional and technically improved.

These The object is solved by the characterizing features of claim 1.

significant is that for weighing the roll of material from the trolley or from the Transport device is lifted by means of the lifting frame, wherein the lifting movement over one or two lifting devices is accomplished. After taking off the Material roll is now over two load cells exclusively force fit connect the lifting device or lifting devices to the lifting frame, so no lateral forces and other disturbances occur, determines the exact weight of the roll of material. noteworthy is that by means of the two so arranged measuring cans the force or the weight of the roll of material directly on the lifting device is measured, so that the two load cells to the actual Force application points are appropriate. Thus, the measurement takes place at the immediate site of action. In addition, the lifting frame is floating stored, this results in no influence from the outside, which falsify the measurement result could.

Consequently results in a more accurate measurement result with increased repeatability of 0.1%. It is significant that the weighing device is trouble-free and easy to retrofit and ensures easy delivery, calibration and commissioning.

At the Lifting frame can be configured as supporting roles configured roller elements, on where the roll of material sits when lifting. After the measurement process can then the carrying rollers are rotated, allowing a removal of the outer packaging material the roll of material possible is.

From Advantage is that no frictional connection between foundation frame and lifting frame, there are thus no tolerances, the could go into the adjustment of the weighing device and distort the result. It is possible, this weighing device easy and only once to Oak, since only the lifting frame and its elements are taken into account here must become.

As a general rule is the weighing device according to the invention Can be retrofitted in all unpacking stations with simple means.

Further advantageous embodiments of the invention are contained in the subclaims.

The Invention will be explained in more detail below using an exemplary embodiment. In the associated Drawings show:

1 a weighing device with a material roll arranged on a trolley,

2 a side view of the weighing device according to 1 (without roll of material) and

3 a plan view of the weighing device according to 1 (without roll of material).

The 1 shows an unpacking station (APS) 20 , which for unpacking rolls of material 2 for use in rotary printing presses or paper machines. It can be integrated in an underfloor roller transport system. Optionally, a weighing device 14 integrated, with which one determines roll weights, indicates and if necessary over an appropriate interface 22 to higher-level evaluation devices, terminals 21 etc. forwards.

A designed as a trolley transport device 1 , loaded with a roll of material 2 will over motorized rollers 3 from an external feeder track to the APS 20 pulled or pushed manually. By pressing an appropriate footswitch 4 on the GSP 20 becomes the roll of material 2 over in a lifting frame 5 stored carrying rollers 6 from the trolley (transport device) 1 lifted. This lifting movement is via two lifting devices 7 - Preferably designed as a fluid-operated cylinder or hydraulic cylinder - reached, which are arranged symmetrically to the center. After reaching the upper end position, by a switch 8th - Preferably, an inductive proximity switch - is queried, is now about two load cells 9 , which exclusively frictionally the Hubreinrichtung (cylinder) 7 with the lifting frame 5 connect, so that no transverse forces and other disturbances occur, the exact weight of the roll of material 2 determined via an evaluation device (terminal) 21 displayed and / or on a variable interface 22 made available. By means of the two load cells designed as load cells 9 becomes the force or the weight of the roll of material 2 directly on the cylinder 7 measured. It only has the curb weight (dead weight) of the lifting frame 5 be taken into account during the calibration. Since the empty weight is always the same, so only a single input value must be taken into account in the calibration. The welded lifting frame 5 is with the carrying roles 6 and their drive 13 with a foundation frame 10 through a caster guide 11 - Preferably a ball roller guide - only positively connected. The welded foundation frame 10 is separately mountable and firmly anchored in the floor. The adjustment of the roller guide 11 via eccentric 12 so that the lifting frame 5 floating in the foundation frame 10 is stored. The connection to the foundation is designed with play.

After the measurement process can then by pressing another footswitch 4 the carrying rollers 6 be rotated, so that a removal of the outer packaging material of the roll of material 2 is possible. After removal, a new weighing can be made. By pressing a foot button 4 can the roll of material 2 then back on the trolley 1 lowered and out of the GSP 20 to get promoted. Carrying from the APS 20 can be done manually or automatically.

By a special - not shown - circuit of the load cells and a matched electronics is a very high accuracy, regardless of weight and position of the role 2 on the GSP 20 reached.

1

Trolley

2

material roll

3

caster

4

footswitch

5

lifting frame

6

supporting role

7

lifting device

8th

switch

9

load cell

10

foundation frame

11

Track roller guidance

12

eccentric

13

drive

14

weighing System

15

16

17

18

19

20

unpacking

21

terminal

22

interface

Claims (6)

Weighing device ( 14 ) for material rolls ( 2 ) in rotary printing presses, a movable lifting frame ( 5 ), by means of weighing the roll of material ( 2 ) these from the transport device ( 1 ) can be lifted, that the lifting movement by means of at least one lifting device ( 7 ), that between the lifting frame ( 5 ) and the lifting device ( 7 ) at least two load cells ( 9 ) are arranged for determining the weight so that the measurement takes place directly at the force application point. Weighing device ( 14 ) according to claim 1, characterized in that the lifting movement by means of two lifting devices ( 7 ) and at the lifting devices ( 7 ) one load cell each ( 9 ) is arranged, by means of which the lifting devices ( 7 ) with the lifting frame ( 5 ) are exclusively positively connected. Weighing device ( 14 ) according to claim 1 or 2, characterized in that the lifting device ( 7 ) is a fluid-operated cylinder. Weighing device ( 14 ) one of claims 1 to 3, characterized in that the lifting frame ( 5 ) Carrying rollers ( 6 ) for rotating the roll of material ( 2 ) are arranged. Weighing device ( 14 ) according to one of claims 1 to 4, characterized in that the lifting frame ( 5 ) by means of a roller guide ( 11 ) floating and self centering in one Foundation frame ( 10 ) is stored. Weighing device according to one of the preceding claims, characterized in that it is located at an unpacking station ( 20 ) is arranged.