Device for the floating clamping of a workpiece to be machined

• US 6,609,705 B1
• Filed: 03/29/2000
• Issued: 08/26/2003
• Est. Priority Date: 03/29/1999
• Status: Expired due to Fees

• Current Assignee: Heidelberger Druckmaschinen Ag
• Original Assignee: Heidelberger Druckmaschinen Ag
• Inventors: Schindler, Reinhard, Eipl, Josef
• Primary Examiner(s): Wilson, Lee D.
• Application Number:
  US09/538,140
• Time in Patent Office: 1,245 Days
• Field of Search: 269/34, 269/32, 269/3, 269/6, 269/25, 269/27, 269/900, 269/20
• US Class Current: 269/34
• CPC Class Codes: B25B 5/04 with pivoted jaws
• CPC Class Codes: B25B 5/061 with fluid drive B25B5/087, B25B5/122 take precedence

Abstract

A device for the floating clamping of a workpiece to be machined. The device has a pair of clamping pistons and a pair of clamping jaws which are capable of being advanced onto mutually opposite sides of the workpiece with the aid of the two clamping pistons so as to exert a clamping force acting on the workpiece. The device is configured to contain a fixedly articulated collet chuck formed by a pair of clamping levers with clamping jaws and defining a chuck opening.

Claims

1. A device for floating clamping a workpiece to be machined by a machine tool, comprising:

a mounting block fixed to the machine tool;

two clamping pistons disposed in said mounting block; and

a fixedly articulated collet chuck actuated by said two clamping pistons, said collet chuck having a pair of clamping levers with two clamping jaws capable of being advanced onto mutually opposite sides of the workpiece with an aid of said two clamping pistons so as to exert a clamping force acting on the workpiece, said pair of clamping levers being fixedly articulated with respect to said mounting block, and said pair of clamping levers and two clamping jaws defining a chuck opening, at least one of said pair of clamping levers being composed of a fixedly articulatable first arm and of a second arm connectable to said fixedly articulatable first arm so as to define a variable width of said chuck opening.

2. A device for floating clamping a workpiece, comprising:

a machine tool for machining the workpiece;

a mounting block fixed to said machine tool;

a pair of clamping pistons disposed in said mounting block and having;

working positions;

a common line of action with a given stroke; and

shanks having non-circular cross-sections;

a pair of clamping levers each having a front portion, a rear portion facing a respective one of said clamping pistons, and an intermediate portion pivotally connected to said mounting block to form a collet chuck, said front portion of said clamping levers defining a pair of jaws that, together with said given stroke of said clamping pistons, defining a chuck opening having a width within a given range;

an adjusting device connected to said clamping levers for moving said front portion of said clamping levers and said jaws into contacting positions in which said jaws are, with a given force, to be abutted upon said workpiece at opposed sides thereof, said adjusting device including;

said pair of clamping pistons; and

a first hydraulic system connected to and actuating said clamping pistons; and

a locking device connected to and locking said clamping pistons in said working positions in which said jaws are in workpiece-contacting positions, said locking device having;

a second hydraulic system;

said shanks;

form locking guide-surface portions receiving said shanks; and

a lever connected to said second hydraulic system and twisting said shanks.

3. The device according to claim 2, wherein after said jaws have been moved into said workpiece-contacting positions and before said clamping pistons have been locked in said working positions, said collet chuck adjusts into pivoting positions.

4. The device according to claim 2, wherein at least one of said pair of clamping levers is composed of:

a fixedly articulatable first arm; and

a second arm variably connected to said fixedly articulatable first arm to define a variable width of said chuck opening.

5. The device according to claim 3, wherein after said jaws have been moved into said workpiece-contacting positions and before said clamping pistons have been locked in said working positions, said collet chuck adjusts into a pivoting position.

6. The device according to claim 2, including adjusting means adapted for adjusting a pivoting position of said collet chuck after said jaws have been moved into said workpiece-contacting positions and before said clamping pistons have been locked in said working positions.

7. A device according to claim 2, wherein said clamping levers are each composed of:

a fixedly articulatable first arm; and

a second arm connected to said fixedly articulatable first arm, said second arms being connectable to said first arms at different mutual distances.

10. The device according to claim 3, wherein after said jaws have been moved into said workpiece-contacting positions and before said clamping pistons have been locked in said working positions, said collet chuck adjusts into pivoting positions.

11. The device according to claim 3, wherein at least one of said pair of clamping levers is composed of:

a fixedly articulatable first arm; and

a second arm variably connected to said fixedly articulatable first arm to define a variable width of said chuck opening.

8. A device for floating clamping a workpiece to be machined by a machine tool, comprising;

a mounting block fixed to the machine tool;

two clamping pistons disposed in said mounting block; and

a fixedly articulated collet chuck actuated by said two clamping pistons, said collet chuck having a pair of clamping levers with two clamping jaws capable of being advanced onto mutually opposite sides of the workpiece with an aid of said two clamping pistons so as to exert a clamping force acting on the workpiece, said pair of clamping levers being fixedly articulated with respect to said mounting block, and said pair of clamping levers and two clamping jaws defining a chuck opening, said clamping levers each being composed of a fixedly articulatable first arm and of a second arm connectable to said fixedly articulatable first arm, said second arms being connectable to said first arms at different mutual distances.

9. A device for floating clamping a workpiece to be machined by a machine tool, comprising:

a mounting block to be fixed to the machine tool;

a pair of clamping pistons disposed in said mounting block and having;

working positions;

a common line of action with a given stroke; and

shanks having non-circular cross-sections;

a pair of clamping levers each having a front portion, a rear portion facing a respective one of said clamping pistons, and an intermediate portion pivotally connected to said mounting block to form a collet chuck, said front portion of said clamping levers defining a pair of jaws that, together with said given stroke of said clamping pistons, defining a chuck opening having a width within a given range;

an adjusting device connected to said clamping levers for moving said front portion of said clamping levers and said jaws into contacting positions in which said jaws are, with a given force, to be abutted upon said workpiece at opposed sides thereof, said adjusting device including;

said pair of clamping pistons; and

a first hydraulic system connected to and actuating said clamping pistons; and

a locking device connected to and locking said clamping pistons in said working positions in which said jaws are in workpiece-contacting positions, said locking device having;

a second hydraulic system;

said shanks;

form locking guide-surface portions receiving said shanks; and

a lever connected to said second hydraulic system and twisting said shanks.

12. The device according to claim 9, wherein after said jaws have been moved into said workpiece-contacting positions and before said clamping pistons have been locked in said working positions, said collet chuck adjusts into a pivoting position.

13. The device according to claim 9, including adjusting means adapted for adjusting a pivoting position of said collet chuck after said jaws have been moved into said workpiece-contacting positions and before said clamping pistons have been locked in said working positions.

14. The device according to claim 9, wherein said clamping levers are each composed of:

a fixedly articulatable first arm; and

a second arm connected to said fixedly articulatable first arm, said second arms being connectable to said first arms at different mutual distances.