DE102018117086A1 - Conveyor belt for a digital printing device - Google Patents

Abstract

The invention relates to a conveyor belt (1) for a digital printing device, a first end (2) and a second end (3) having a common weld seam (4), a first edge (5) and a second edge (6) being present wherein the weld seam (4) comprises a first leg (7) and a second leg (8), the first leg (7) being arranged at a first angle (9) from the first edge (5) to a center line (10) and the second leg (8) is arranged at a second angle (11) from the second edge (6) to the center line (10), the first leg (7) and the second leg (8) meeting at the center line ,

Description

Technical field

The invention relates to a conveyor belt for a digital printing device according to the preamble of claim 1.

State of the art

Such conveyor belts are already known and used in a variety of forms and configurations. The disadvantage here is the fact that conveyor belts that run absolutely at a constant speed are required for digital printing. However, the conveyor belts must be welded in one place. The end regions of the conveyor belts lie face to face at a right angle and are connected to one another by an interlocking finger connection and additionally welded by heat or otherwise. However, on the inside, that is, on the side facing a drive roller, the welding increases the coefficient of friction. Due to the increased friction, the conveyor belt is accelerated in the area of the welding as it passes through the drive roller, which in turn always leads to incorrect pressure at the same time.

To turn this off, for example, in DE 20 2015 003 314 U1 discloses an endless belt which runs from one roll to another roll during the printing process, the production of endless belts not being technically feasible in widths over 800 mm.

Object of the invention

The object of the present invention is to provide a conveyor belt for digital printing, which switches off or prevents the short-term acceleration described above.

Solution of the task

The features according to claim 1 lead to the achievement of the object.

Advantageous refinements are described in the subclaims.

The conveyor belt according to the invention is used in a digital printing device. It is a conveyor belt that is arranged in a concentric manner and can be rotated via at least one internal drive roller and a plurality of deflection rollers. In the initial state, this conveyor belt has a first end and a second end. These two ends can be connected via a common weld seam. There is also a first edge and a second edge.

The weld seam comprises a first leg and a second leg, the first leg being arranged at a first angle from the first edge to a center line and the second leg being arranged at a second angle from the second edge to the center line, the first The leg and the second leg meet at the midline. The two legs form an arrow shape, the tip of which lies on the center line. This arrow shape has the advantage that the increased friction, which leads to the unwanted acceleration of the conveyor belt when passing through the drive roller, is eliminated. This is done in detail by the fact that the point of welding at the tip of the arrow passing the drive roller is minimal at the beginning and then the area of friction is increased, but is then always divided to the right and left of the center at the same distance from the center line and thus becomes one Compensation is established. This means that a division of the friction surface reduces the acceleration effect. Furthermore, these reduced friction surfaces are divided in such a way that they occur at the same distance to the right and left of the center line. This provision of the friction surface at the same distance from the center line in turn prevents the conveyor belt from sinusoidally dancing, as occurs with a single oblique connection point which extends linearly from one edge to the other edge.

In this connection, the first angle and the second angle is between 30 ° and 150 °, preferably 40 ° to 140 °. It is particularly advantageous if the first angle and the second angle are 45 ° or 135 °. It is important that the angle is measured from the respective edge. Depending on which side of the leg, which runs away from the edge to the center line, has an angle of 45 ° on one side and an angle of 135 ° on the other side of the leg. The base leg is the first and / or second edge of the conveyor belt. The first leg runs from the first edge to the center line and the second leg runs from the second edge to the center line. The legs form the weld seam and, at the same time, essentially form the first and second ends of the band.

The conveyor belt is advantageously made of polyurethane. Polyurethane forms an advantageous combination of tear resistance, flexibility and simple weldability at the weld seam.

The first end and the second end have an interlocking finger connection. This means that the two ends engage in a form-fitting and / or complementary manner and enable easier and faster welding to produce the weld seam.

In the area of the first leg and the second leg there is an additional connecting line arranged at right angles to the edges. As an additional connecting line within the scope of this invention, welding points arranged several times in the width of the welding press apply. This has the advantage that in some cases bulges between the two legs, in particular near the center line or on the other side at the arrow head, can be prevented from bulging. To reinforce this advantage, a further spaced additional connecting line can be arranged in addition to the additional connecting line. The number of further spaced additional connecting lines depends on the purpose intended by the user and the dimensions of the conveyor belt. In another exemplary embodiment, the further spaced additional connecting line is arranged parallel to the additional connecting line.

The conveyor belt further comprises a drive roller and a deflection roller.

It can further be provided that the conveyor belt has a complete or partial perforation. Such perforation serves the use of the conveyor belt, for example in vacuum transport systems. It has proven to be advantageous if each individual hole has a diameter of 3 mm to 10 mm, preferably 4 or 7 mm, during the perforation. The adaptation to the substrate to be transported is adapted.

In addition, for a compact design of digital printing devices, it has been found that the conveyor belt in the initial state, i.e. before it was connected via the weld seam, has an overall length of 4900 mm to 7000 mm, in particular 5970 mm and an overall width of 700 mm or up to 1200 mm, preferably 1120 mm.

list of figures

• 1 eine Seitenansicht eines Transportbandes;
• 2 eine Draufsicht auf einen Teil des Transportbandes.

Further advantages, features and details of the invention emerge from the following description of preferred exemplary embodiments and with reference to the drawings; these show in:

• 1 a side view of a conveyor belt;
• 2 a plan view of a part of the conveyor belt.

embodiment

In 1 is a conveyor belt 1 shown from the side. There is a drive roller on the inside of the conveyor belt 14 and three guide rollers 15.1 . 15.2 . 15.3 shown which the transportand 1 rotate.

In 2 is the conveyor belt 1 shown in a top view. The conveyor belt 1 has a first end 2 and a second end 3 on. In the 2 are the two ends 2 . 3 over a common weld 4 connected to the conveyor belt 1 in the in 1 to bring the shape shown.

The common weld 4 consists of a first leg 7 and a second leg 8th , The first leg 7 protrudes from the first edge 5 at a first angle 9 towards a center line 10 from. The second leg protrudes further 8th from a second edge 6 at a second angle 11 also to the center line 10 down. The two legs 7 . 8th meet due to the identical number of angles of the two angles 9 . 11 and the same starting position on the two edges 5 . 6 in the center line 10 , As a result, they form an arrow shape.

The center line 10 is actually not recognizable. It is only used for better understanding within the scope of the invention. The center line 10 runs centrally in the longitudinal extension of the conveyor belt 1 , The middle line 10 passes through the two ends 2 . 3 center.

The two angles 9 . 11 have an angle of 45 °. This creates an ideal distribution. On the other hand, the weld seam 4 there are wider angles with a degree of 135 °.

The two ends point further 2 . 3 an interlocking finger connection, which is not described here.

The conveyor belt 1 through the two ends 2 . 3 and the two edges 5 . 6 Are defined. In the area of the first leg 7 and the second leg 8th is one at right angles to the edges 5 . 6 arranged additional connection line 12 available. To the additional connection line 12 is another spaced additional connection line 13 , 1 . 13.2 . 13.3 . 13.4 arranged. The further spaced additional connecting lines 13 , 1 . 13.2 . 13.3 . 13.4 are parallel to the additional connection line 12 is arranged.

In this exemplary embodiment, the two legs form a right angle in the region of the center line. This right angle results because of the first angle 9 of 45 ° and the second angle, which also has 45 °.

Although only a preferred embodiment of the invention has been described and illustrated, it will be apparent that those skilled in the art can add numerous modifications without departing from the spirit and scope of the invention. This applies in particular to perforation, which can be provided. This perforation can cover the entire area of the conveyor belt 1 or just drag a part of the area.

LIST OF REFERENCE NUMBERS

1

conveyor belt

2

First end

3

Second end

4

Weld

5

First edge

6

Second edge

7

First leg

8th

Second leg

9

First angle

10

center line

11

Second angle

12

Additional connecting line

13

Further additional connection line

14

drive roller

15

deflecting

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 202015003314 U1 [0003]

Claims (11)

Conveyor belt (1) for a digital printing device, wherein a first end (2) and a second end (3) can be connected via a common weld seam (4), a first edge (5) and a second edge (6) being present characterized in that the weld seam (4) comprises a first leg (7) and a second leg (8), the first leg (7) at a first angle (9) from the first edge (5) to a center line (10) is arranged and the second leg (8) is arranged at a second angle (11) from the second edge (6) to the center line (10), the first leg (7) and the second leg (8) being located on the center line to meet. Conveyor belt (1) after Claim 1 , characterized in that the first angle (9) and the second angle (11) is between 40 ° and 140 °, in particular the first angle (9) and the second angle (11) are 45 ° or 135 °. Conveyor belt (1) after Claim 1 or 2 , characterized in that the conveyor belt (1) consists of polyurethane (PU). Conveyor belt (1) according to one of the preceding claims, characterized in that the first end (2) and the second end (3) have an interlocking finger connection. Conveyor belt (1) according to one of the preceding claims, characterized in that in the region of the first leg (7) and the second leg (8) has an additional connecting line (12) arranged at right angles to the edges (5, 6). Conveyor belt (1) after Claim 5 , characterized in that a further spaced additional connecting line (13.1, 13.2, 13.3, 13.4) is arranged in addition to the additional connecting line (12). Conveyor belt (1) after Claim 6 , characterized in that the further spaced additional connecting line (13. 1, 13.2, 13.3, 13.4) is arranged parallel to the additional connecting line (12). Conveyor belt (1) according to one of the preceding claims, characterized by a drive roller (14) and a deflection roller (15.1, 15.2, 15.3). Conveyor belt (1) according to one of the preceding claims, characterized by a perforation, each individual hole having a diameter of 4mm to 10mm, in particular 7mm. Conveyor belt (1) according to one of the preceding claims, characterized by a total length of 4900 mm to 6000 mm, in particular 5970mm. Conveyor belt (1) according to one of the preceding claims, characterized by a total width of 700mm to 1200mm, in particular 1120mm.

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