Title of Invention	CRANK SHEAR FOR CUTTING ROLLED STRIP
Abstract	Crank shear for cutting rolled strip (22), which comprises two pairs of blades (3, 4) which are mounted on blade holders (1, 2), wherein the blade holders (1, 2) are supported opposite each other in a vertical plane (x-x) in a pair of eccentric drive shafts (5, 6) and are pivoted on torque-supporting levers (7, 8) in double-joint mechanisms (9, 10) in interaction with two hydraulic control units (11, 12) that act on these double-joint mechanisms (9, 10) and that the upper pair of blades (3) are located in a curved recess (20) of the upper blade holder (1) at the bearing surfaces (16, 17), characterized in that the lower pair of blades (4) are located at the outer bearing surfaces (18, 19) of a projection (15) that is positioned .against the recess (20) and that the projection (15) is constructed as a single piece together with the lower blade holder (2).

Title of Invention

CRANK SHEAR FOR CUTTING ROLLED STRIP

Abstract

Crank shear for cutting rolled strip (22), which comprises two pairs of blades (3, 4) which are mounted on blade holders (1, 2), wherein the blade holders (1, 2) are supported opposite each other in a vertical plane (x-x) in a pair of eccentric drive shafts (5, 6) and are pivoted on torque-supporting levers (7, 8) in double-joint mechanisms (9, 10) in interaction with two hydraulic control units (11, 12) that act on these double-joint mechanisms (9, 10) and that the upper pair of blades (3) are located in a curved recess (20) of the upper blade holder (1) at the bearing surfaces (16, 17), characterized in that the lower pair of blades (4) are located at the outer bearing surfaces (18, 19) of a projection (15) that is positioned .against the recess (20) and that the projection (15) is constructed as a single piece together with the lower blade holder (2).

Full Text	-- Figure 2 shows the crank shear in its extremely wide-open position for the passage of the rolled strip. — Figure 3 shows the crank shear, likewise in a side view, in a position for cropping the tail end of the strip. -- Figure 4 shows the crank shear in its open position for another passage of the rolled strip following the cropping of the "ail end of the strip. Figure 1 shows the crank shear with two pairs of blades 3, 4, which can be mounted on blade holders 1/"2", wherein the blade holders 1, 2 are supported opposite each ether in a vertical ■ plane (x-x) in a pair of eccentric drive shafts 5, 6 and are pivoted on torque supporting levers 7., 8 in double-joint mechanisms 9, 10 and interact with hydraulic control units- 11/ 12 that act on these double-joint mechanisms. The blade holders 1, 2 form axially parallel pairs of bearing surfaces 16 to 18 for the pairs of blades 3, 4 on approximately radial projections 13 to 15, with the upper pair "of blades 3 arranged on inner, oppositely oriented bearing surfaces 16, 17 of a curved recess 20 of the upper blade holder I, and with the lower pair of blades 4 arranged on the outer bearing surfaces 18 of a relatively narrow projection 15 orier.-ed towards the recess 20. In a spread position of the torque supporting levers 7, 3 of approximately 90° and at the shortest separation D of the eccentric'shafts 5, 5 and a running direction 21 of the rolled strip 22, the crank shear has reached a position of the pair of blades 3 for the cropping cut at the leading end 23 of the strip. In this position, the hydraulic control unit 11 on the upper supporting lever 7 of the-double-joint mechanism 9 is fully extended to spread the supporting lever 7, and the control unit" 12 on the lower supporting lever 8 of the double-joint mechanism 10 is fully retracted. Reference number 19 identifies the roller table for conveying the rolled strip 22. Figure 2 shows a wide passage position of the crank shear for the rolled strip in an extreme spread position of the torque supporting levers 7, 8 of approximately 90° at the greatest separation d of the eccentric shafts 5, 6 and with a running direction 21 of the rolled strip 22 towards the supporting levers 7, 8. In this position, the control unit 12 on the lower supporting lever 8 of the double-joint mechanism 10 is fully retracted for its folding the lower supporting lever 8, and the control unit 11 on the upper supporting lever 7 of the double-joint mechanism 9 is fully extended. Figure 3 shows the crank shear with an approximately horizontal parallel position of the torque supporting levers 7, 8 opposite the running direction 21 of the rolled strip 22 and at the shortest separation D of the eccentric shafts 5, 6, and with the upper double-joint mechanism 9 and lower double-joint mechanism 10 extended approximately linearly. A position of the rear pair of blades for cutting the tail end 24 of the strip is reached here. In this position, the hydraulic control unit 11 on the upper supporting lever 7 of the double-joint mechanism 9 is fully retracted, and the control unit 12 on the lower supporting lever 3 of the double-joint mechanism 10 is fully extended. Finally, Figure 4 shows a passage-position through the shear with the eccentric shafts 5, 6 at their greatest separation. Here the upper hydraulic control unit 11 of the upper double-joint mechanism 9 is fully retracted in a position of the upper supporting lever 7 that is downwardly inclined, while the lower control unit 12 of the lower double-joint mechanism 10 is fully retracted. 19. roller table 20. curved recess 21. running direction 22. strip/rolled strip 23. leading end of strip 24. tail end of strip 25. stop 26. stop 27. stop 28. stop CLAIMS 1. Crank shear, especially for cutting rolled strip (22), which comprises two pairs of blades (3, 4) that can be mounted on blade holders (1, 2), wherein the blade holders (1, 2) are supported opposite, each other in a vertical plane (x-x) in a pair of eccentric drive shafts (5, 6) and are pivoted on torque supporting levers (7, 8) in double-joint mechanisms (9, 10) in interaction with two hydraulic control units (11, 12) that act on these double-joint mechanisms (9, 10), wherein the blade holders (1, 2j form axially parallel pairs of bearing surfaces (16-19) for the pairs of blades (3, 4) on approximately radial projections (13-15), with the upper pair of blades (3) arranged on ir.ner, oppositely oriented bearing surfaces (16, 17) of a curved recess (20) of the upper blade holder (1), and with the lower pair of blades (4) arranged on the outer bearing surfaces (19, 18) of a relatively narrow projection (15) oriented towards the recess (20), and wherein in a spread position of the torque supporting levers (7, 8) of approximately 90° and at the greatest separation (d) of the eccentric shafts (5, 6) and a running direction (21) of the rolled"strip (22) towards the is reached/ in which -he control unit (12; on the lower supporting lever (Sv cf the double- j oint mechanism (10) is fully retracted, and the central unit (11) on the upper supporting lever (7) of the double-joint mechanism (2) is fully expended (Figure 2) . 2. Crank shear, especially for cutting rolled strip ;22) , which comprises two pairs of blades (3, 4 that can be mounted on blade holders (1, 2), wherein the blade holders (1, 2) are supported opposite each other in a vertical plane (x-x) in a pair of eccentric drive shafts (5, 6) and are pivoted en torque supporting levers (7, &) in double-joint mechanisms (9, 10! in interaction with two hydraulic control units (11, 12) that act on these double-joint mechanisms (9, 10)-, wherein the blade •holders (1, 2; form axially parallel pairs of bearing surfaces (16-19) for the pairs of blades (3, 4) on approximately radial projections (13-15), with the upper pair cf blades (3) arranged on inner, oppositely oriented bearing surfaces (16, 17) of a curved recess (20) of the upper blade holder (1), and with the lower pair of blades (4) arranged on the cuter bearing surfaces (19, 13) of a relatively narrow projection (15) oriented towards the recess (20), and wherein in a position of the upper supporting lever (7) that is downwardly inclined towards the * rolled strip (22) with the upper hydraulic control unit (11) of the lower supporting lever (3) that is upwardly inclined towards th'e rolled strip (21 with the lower control unit (12) of the double-joint mechanise (10) fully extended, and with the greatest separation d; of the eccentric shafts (5, 6), the passage position through the shear is reached (Figure 4;. 3. Crank shear in accordance with Claim 1 or Claim 2, characterized by the fact that in a spread position of the torque supporting levers (7, 8) of approximately 90° and at the shortest separation ti) of the eccentric shafts (5, 6) and a running direction (21; of the rolled strip ;22) towards the supporting levers (7, 3), a position of the pair of blades (3) for the cropping cut at" the leading end (23) of the strip is reached, in which the hydraulic control unit (11) on the upper . supporting lever (7) of the double-joint mechanism (9) is fully extended, and the.hydraulic control unit (12; on the lower supporting lever (3) of the double-joint mechanism (10) is full'/ retracted (Figure 1). 4. .Crank shear in accordance with Claim 1 or Claim 2, characterized, by the fact that in an approximately horizontal parallel position of the torque supporting levers (7, 8) opposite the running direction (21) of the rolled strip (22) and at the shortest separation (D) of the eccentric shafts (5, 6) , and with the upper double-joint mechanism (9; and lower double- of the rear pair of blades for cutting the tail end (24) cf the strip is reached, in which the hydraulic control unit {11} on the upper supporting lever (7) of the double-joint mechanism (9) is fully retracted, and the control unit (12) on the lower supporting lever (8) of the double-joint mechanism (10) is fully extended (Figure 3).

Full Text

-- Figure 2 shows the crank shear in its extremely wide-open position for the passage of the rolled strip.
— Figure 3 shows the crank shear, likewise in a side view, in a position for cropping the tail end of the strip.
-- Figure 4 shows the crank shear in its open position for another passage of the rolled strip following the cropping of the "ail end of the strip.
Figure 1 shows the crank shear with two pairs of blades 3, 4, which can be mounted on blade holders 1/"2", wherein the blade holders 1, 2 are supported opposite each ether in a vertical ■ plane (x-x) in a pair of eccentric drive shafts 5, 6 and are pivoted on torque supporting levers 7., 8 in double-joint mechanisms 9, 10 and interact with hydraulic control units- 11/ 12 that act on these double-joint mechanisms.
The blade holders 1, 2 form axially parallel pairs of bearing surfaces 16 to 18 for the pairs of blades 3, 4 on approximately radial projections 13 to 15, with the upper pair "of blades 3 arranged on inner, oppositely oriented bearing surfaces 16, 17 of a curved recess 20 of the upper blade holder I, and with the lower pair of blades 4 arranged on the outer bearing surfaces 18 of a relatively narrow projection 15 orier.-ed towards the recess 20.

In a spread position of the torque supporting levers 7, 3 of approximately 90° and at the shortest separation D of the eccentric'shafts 5, 5 and a running direction 21 of the rolled strip 22, the crank shear has reached a position of the pair of blades 3 for the cropping cut at the leading end 23 of the strip. In this position, the hydraulic control unit 11 on the upper supporting lever 7 of the-double-joint mechanism 9 is fully extended to spread the supporting lever 7, and the control unit" 12 on the lower supporting lever 8 of the double-joint mechanism 10 is fully retracted. Reference number 19 identifies the roller table for conveying the rolled strip 22.
Figure 2 shows a wide passage position of the crank shear for the rolled strip in an extreme spread position of the torque supporting levers 7, 8 of approximately 90° at the greatest separation d of the eccentric shafts 5, 6 and with a running direction 21 of the rolled strip 22 towards the supporting levers 7, 8. In this position, the control unit 12 on the lower supporting lever 8 of the double-joint mechanism 10 is fully retracted for its folding the lower supporting lever 8, and the control unit 11 on the upper supporting lever 7 of the double-joint mechanism 9 is fully extended.
Figure 3 shows the crank shear with an approximately

horizontal parallel position of the torque supporting levers 7, 8 opposite the running direction 21 of the rolled strip 22 and at the shortest separation D of the eccentric shafts 5, 6, and with the upper double-joint mechanism 9 and lower double-joint mechanism 10 extended approximately linearly. A position of the rear pair of blades for cutting the tail end 24 of the strip is reached here. In this position, the hydraulic control unit 11 on the upper supporting lever 7 of the double-joint mechanism 9 is fully retracted, and the control unit 12 on the lower supporting lever 3 of the double-joint mechanism 10 is fully extended.
Finally, Figure 4 shows a passage-position through the shear with the eccentric shafts 5, 6 at their greatest separation. Here the upper hydraulic control unit 11 of the upper double-joint mechanism 9 is fully retracted in a position of the upper supporting lever 7 that is downwardly inclined, while the lower control unit 12 of the lower double-joint mechanism 10 is fully retracted.

19. roller table
20. curved recess
21. running direction
22. strip/rolled strip
23. leading end of strip
24. tail end of strip
25. stop
26. stop
27. stop
28. stop

CLAIMS
1. Crank shear, especially for cutting rolled strip (22), which comprises two pairs of blades (3, 4) that can be mounted on blade holders (1, 2), wherein the blade holders (1, 2) are supported opposite, each other in a vertical plane (x-x) in a pair of eccentric drive shafts (5, 6) and are pivoted on torque supporting levers (7, 8) in double-joint mechanisms (9, 10) in interaction with two hydraulic control units (11, 12) that act on these double-joint mechanisms (9, 10), wherein the blade holders (1, 2j form axially parallel pairs of bearing surfaces (16-19) for the pairs of blades (3, 4) on approximately radial projections (13-15), with the upper pair of blades (3) arranged on ir.ner, oppositely oriented bearing surfaces (16, 17) of a curved recess (20) of the upper blade holder (1), and with the lower pair of blades (4) arranged on the outer bearing surfaces (19, 18) of a relatively narrow projection (15) oriented towards the recess (20), and wherein in a spread position of the torque supporting levers (7, 8) of approximately 90° and at the greatest separation (d) of the eccentric shafts (5, 6) and a running direction (21) of the rolled"strip (22) towards the

is reached/ in which -he control unit (12; on the lower supporting lever (Sv cf the double- j oint mechanism (10) is fully retracted, and the central unit (11) on the upper supporting lever (7) of the double-joint mechanism (2) is fully expended
(Figure 2) .
2. Crank shear, especially for cutting rolled strip ;22) , which comprises two pairs of blades (3, 4 that can be mounted on blade holders (1, 2), wherein the blade holders (1, 2) are supported opposite each other in a vertical plane (x-x) in a pair of eccentric drive shafts (5, 6) and are pivoted en torque supporting levers (7, &) in double-joint mechanisms (9, 10! in interaction with two hydraulic control units (11, 12) that act on these double-joint mechanisms (9, 10)-, wherein the blade •holders (1, 2; form axially parallel pairs of bearing surfaces
(16-19) for the pairs of blades (3, 4) on approximately radial projections (13-15), with the upper pair cf blades (3) arranged on inner, oppositely oriented bearing surfaces (16, 17) of a curved recess (20) of the upper blade holder (1), and with the lower pair of blades (4) arranged on the cuter bearing surfaces
(19, 13) of a relatively narrow projection (15) oriented towards the recess (20), and wherein in a position of the upper
supporting lever (7) that is downwardly inclined towards the
*
rolled strip (22) with the upper hydraulic control unit (11) of

the lower supporting lever (3) that is upwardly inclined towards th'e rolled strip (21 with the lower control unit (12) of the double-joint mechanise (10) fully extended, and with the greatest separation d; of the eccentric shafts (5, 6), the passage position through the shear is reached (Figure 4;.
3. Crank shear in accordance with Claim 1 or Claim 2,
characterized by the fact that in a spread position of the
torque supporting levers (7, 8) of approximately 90° and at the
shortest separation ti) of the eccentric shafts (5, 6) and a
running direction (21; of the rolled strip ;22) towards the
supporting levers (7, 3), a position of the pair of blades (3)
for the cropping cut at" the leading end (23) of the strip is
reached, in which the hydraulic control unit (11) on the upper
. supporting lever (7) of the double-joint mechanism (9) is fully extended, and the.hydraulic control unit (12; on the lower supporting lever (3) of the double-joint mechanism (10) is full'/ retracted (Figure 1).
4. .Crank shear in accordance with Claim 1 or Claim 2,
characterized, by the fact that in an approximately horizontal
parallel position of the torque supporting levers (7, 8)
opposite the running direction (21) of the rolled strip (22) and
at the shortest separation (D) of the eccentric shafts (5, 6) ,
and with the upper double-joint mechanism (9; and lower double-

of the rear pair of blades for cutting the tail end (24) cf the strip is reached, in which the hydraulic control unit {11} on the upper supporting lever (7) of the double-joint mechanism (9) is fully retracted, and the control unit (12) on the lower supporting lever (8) of the double-joint mechanism (10) is fully extended (Figure 3).

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Patent Number

220967

Indian Patent Application Number

1602/CHENP/2005

PG Journal Number

31/2008

Publication Date

01-Aug-2008

Grant Date

11-Jun-2008

Date of Filing

13-Jul-2005

Name of Patentee

SMS DEMAG AG

Applicant Address

Inventors:

#	Inventor's Name	Inventor's Address
1	HEITZE, GERHARD
2	GREBE, ULRICH
3	BAUMER ,KLAUS

PCT International Classification Number

B23D 25/08

PCT International Application Number

PCT/EP03/14225

PCT International Filing date

2003-12-15

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	102 58 887.2	2002-12-17	Germany