Press drive comprising two working areas

Patent metadata

Field	Value
Publication number	US-10589484-B2
Application number	US-201414492162-A
Country	US
Kind code	B2
Filing date	Sep 22, 2014
Priority date	Mar 23, 2012
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

The invention relates to a press drive for a press or a press having a press drive. The invention also relates to a method for controlling the press drive by means of a control unit. The press drive is used for moving a ram of the press in a stroke direction H between an upper return point OT and a lower return point UT. It comprises a knee lever gear having a first lever and a second lever. A connecting rod engages on the knee lever of the two levers and is connected on the other end to an eccentric of an eccentric drive. The control unit can drive the eccentric drive in a first operating mode B1 or a second operating mode B2 or, in particular, also a third operating mode B3. In the first and the second operating modes B1, B2, the eccentric oscillates in a respectively different angle region W1, W2 about a rotation axis D of the eccentric drive, thus resulting in different force and movement states of the ram in both operating modes.

First claim

What is claimed is:

1. A press drive ( 16 ) for a press ( 10 ) comprising:
a knee lever gear ( 24 ) having a first lever ( 25 ) and a second lever ( 26 ) that are pivotally supported on a hinged joint ( 27 ), wherein the knee lever gear ( 24 ) has a first bearing ( 28 ) which supports the first lever ( 25 ) on a press frame ( 11 ), as well as a second bearing ( 29 ) at which the second lever ( 26 ) is connected to a rain ( 15 ) of the press ( 10 );
a connecting rod ( 32 ) whose one end is pivotally supported on the hinged joint ( 27 ) and whose other end ( 34 ) is connected to an eccentric ( 35 ) of an eccentric drive ( 33 ), said eccentric being movable about a rotation axis (D);
a control device ( 40 ) is configured to activate and to drive the eccentric drive ( 33 ) in at least one of a first operating mode (B 1 ) and a second operating mode (B 2 );
wherein the eccentric ( 35 ) is driven in a prespecified first angle region (W 1 ) in a rotation-oscillating manner in the first operating mode (B 1 ) and is driven in a rotation-oscillating manner in a prespecified second angle region (W 2 ) in a second operating mode (B 2 );
the press drive ( 16 ) is configured such that the rain ( 15 ) reaches a lower return point (UT) of the rain ( 15 ) twice during a complete rotation of the eccentric ( 35 ) at a second angle of rotation (α 1 ) and a third angle of rotation (α 2 );
in the first operating mode (B 1 ) the eccentric ( 35 ) is driven in the rotation-oscillating manner in the first angle region (W 1 ) about the second angle of rotation (α 1 ) and in the second operating mode (B 2 ) the eccentric ( 35 ) is driven in the rotation-oscillating manner in the second angle region (W 2 ) about the third angle of rotation (α 2 );
a first angle (β 1 ) is enclosed between a longitudinal axis (L) of the connecting rod ( 32 ) and an axis (A) connecting the first bearing ( 28 ) and the second bearing ( 29 ) when the rain ( 15 ) is at the lower return point (UT) in the first operating mode (B 1 ) and a second angle (β 2 ) is enclosed between the longitudinal axis (L) of the connecting rod ( 32 ) and the axis (A) connecting the first bearing ( 28 ) and the second bearing ( 29 ) when the rain ( 15 ) is at the lower return point (UT) in the second operating mode (B 2 );
for activating the eccentric drive ( 33 ), the control device ( 40 ) further includes a third operating mode (B 3 ) for driving the eccentric drive ( 33 ) in which the eccentric ( 35 ) performs a full rotation about the rotation axis (D);
the two prespecified angle regions (W 1 , W 2 ) do not have an overlap region;
the control device ( 40 ) is configured to automatically select and adjust at least one of the first operating mode (B 1 ) and the second operating mode (B 2 ) and the third operating mode (B 3 ) in view of detected or pre-specified parameters.

2. The press drive of claim 1 , characterized in that the hinged joint ( 27 ) is moved through the axis (A) connecting the first bearing ( 28 ) and the second bearing ( 29 ) in one of the first, second or third operating modes (B 1 , B 2 , B 3 ).

3. The press drive of claim 1 , characterized in that the hinged joint ( 27 ) is moved at most up to the axis (A) connecting the first bearing ( 28 ) and the second bearing ( 29 ) in one of the first, second or third operating modes (B 1 , B 2 , B 3 ).

4. The press drive of claim 1 , characterized in that the control device ( 40 ) is configured to activate and to drive the eccentric drive ( 33 ) in a fourth operating mode or in the first operating mode (B 1 ) or the second operating mode (B 2 ) such that the eccentric ( 35 ) of the eccentric drive ( 33 ) is driven in an oscillating manner in a prespecified angle region, in which case the hinged joint ( 27 ) neither reaches the axis (A) connecting the first bearing ( 28 ) and the second bearing ( 29 ) nor is said hinged joint ( 27 ) moved through said axis (A).

5. The press drive of claim 1 , wherein the first angle (β 1 ) and the second angle (β 2 ) have different sizes.

6. The press drive of claim 5 , characterized in that the size of the first angle (β 1 ) is greater than the size of the second angle (β 2 ).

7. The press drive of claim 1 , characterized in that a rain velocity (V) about the lower return point (UT), with the same rotational speed (co) of the eccentric ( 35 ), is lower in the first operating mode (B 1 ) than in the second operating mode (B 2 ).

8. The press drive of claim 1 , characterized in that the first bearing ( 28 ) is non-displaceably arranged on the press frame ( 11 ).

9. The press drive of claim 1 , characterized in that at least one of the lengths of the two levers ( 25 , 26 ) and the length of the connecting rod ( 32 ) are unchangeable.

10. The press drive of claim 1 , characterized in that at least one of the position of the rotation axis (D) of the eccentric drive ( 33 ) relative to the press frame ( 11 ) and the eccentricity (E) of said eccentric ( 35 ) are unchangeable.

11. The press drive of claim 1 , characterized in that one of the first lever ( 25 ) or the second lever ( 26 ) or connecting rod ( 32 ) is configured as a triangular control arm ( 36 ) having three linkage points.

12. The press drive of claim 11 , wherein the triangular control arm ( 36 ) includes a hinged joint ( 27 ) having a pivot axis proximate each of a first spaced apart linkage point ( 27 a ) and a second spaced apart linkage point ( 27 b ).

13. The press drive of claim 12 , wherein the pivot axes of the hinged joint ( 27 ) proximate the first spaced apart linkage point ( 27 a ) and the second space apart linkage point ( 27 b ) extend parallel to each other.

14. The press drive of claim 12 , wherein when the first lever ( 25 ) is configured as the triangular control arm ( 36 ), the second lever ( 26 ) comes into engagement at the first spaced apart linkage point ( 27 a ) and the connecting rod ( 32 ) comes into engagement at the second spaced apart linkage point ( 27 b ).

15. The press drive of claim 12 , wherein when the second lever ( 26 ) is configured as the triangular control arm ( 36 ), the first lever ( 25 ) comes into engagement at the first spaced apart linkage point ( 27 a ) and the connecting rod ( 32 ) comes into engagement at the second spaced apart linkage point ( 27 b ).

16. The press drive of claim 12 , wherein when the connecting rod ( 32 ) is configured as the triangular control arm ( 36 ), the first lever ( 25 ) comes into engagement at the first spaced apart linkage point ( 27 a ) and the second lever ( 26 ) comes into engagement at the second spaced apart linkage point ( 27 b ).

Assignees

• Hedler Rainer
• Kosse Marcus
• Beyer Joachim
• Schuler Pressen Gmbh

Inventors

• Hedler Rainer
• Kosse Marcus
• Beyer Joachim

Classifications

• B30B1/268

  using a toggle connection between driveshaft and press ram · CPC title

• B30B1/14 Primary

  operated by cams, eccentrics, or cranks · CPC title