Machine tool with improved tool changer means

• US 6,350,222 B2
• Filed: 07/28/1999
• Issued: 02/26/2002
• Est. Priority Date: 07/28/1999
• Status: Expired due to Term

• Current Assignee: Thermwood Corporation
• Original Assignee: Thermwood Corporation
• Inventors: Susnjara, Kenneth J.
• Primary Examiner(s): Briggs, William
• Assistant Examiner(s): Cadugan, Erica E
• Application Number:
  US09/362,113
• Publication Number:
  US 20010041649A1
• Time in Patent Office: 944 Days
• Field of Search: 483/1, 483/4, 483/5, 483/7, 483/8, 483/9, 483/10, 483/11, 483/38, 483/47, 483/50, 483/51, 483/64, 483/6, 483/63, 700/179, 700/173, 700/175, 700/169
• US Class Current: 483/1
• CPC Class Codes: B23B 31/265 by means of collets
• CPC Class Codes: B23Q 1/012 Portals
• CPC Class Codes: B23Q 2003/15527 the storage device including means to latch tools
• CPC Class Codes: B23Q 2003/15537 Linearly moving storage devices
• CPC Class Codes: B23Q 3/15534 Magazines mounted on the spindle
• CPC Class Codes: B23Q 3/15536 Non-rotary fixed racks
• CPC Class Codes: B23Q 3/15539 Plural magazines, e.g. involving tool transfer from one magazine to another involving manual operation B23Q3/15533
• CPC Class Codes: B23Q 3/15706 a single tool being inserted in a spindle directly from a storage device, i.e. without using transfer devices B23Q3/15786 takes precedence
• CPC Class Codes: B23Q 3/15724 Chains or belts
• CPC Class Codes: Y10T 483/10 Process
• CPC Class Codes: Y10T 483/123 Replaceable information comprising tool location
• CPC Class Codes: Y10T 483/132 Responsive to tool identifying information
• CPC Class Codes: Y10T 483/134 Identifying information on tool or tool holder
• CPC Class Codes: Y10T 483/1752 including tool holder pivotable about axis
• CPC Class Codes: Y10T 483/1774 Distinct tool changer for each tool
• CPC Class Codes: Y10T 483/1781 Tool holder pivotable about plural nonparallel axes
• CPC Class Codes: Y10T 483/1783 including linearly translatable tool changer [e.g., shuttle, ram, etc.]
• CPC Class Codes: Y10T 483/1845 Plural matrices
• CPC Class Codes: Y10T 483/1855 including tool replenishing

Abstract

A tool changer for a machine tool having a toolhead assembly including a spindle with a device detachable securing a tool thereto, generally consisting of at least one device for holding a tool detachably securable to the spindle, pivotally connected to the assembly and angularly displaceable in a plane including the axis of the spindle between a retracted position and an extended position for transferring a tool between the tool holding device and the spindle; and a device for angularly displacing the tool holding device between such retracted and extended positions.

Claims

1. In a system including a machine operable to perform a process;

a controller including a memory, operable to execute a program to cause said machine to perform said process;

a tool head assembly mounted on said machine provided with a spindle and a first means for storing a selected number of tools, operable for selectively displacing each of said tools thereof between a storage position and a position for transfer of said tools to and from said spindle; and

second means for storing a selected number of tools, the second storing means being accessible by said spindle such that said tools can be transferred between said second storing means and said spindle, a method comprising;

storing in the memory the site of each of said tools relative to one of said first and second storing means and said spindle;

loading a program into the controller, executable to cause said machine to perform a process;

executing said program including;

identifying the tools most used to perform said process;

transferring each non-identified tool located on said first storing means and said spindle from said first storing means and said spindle to said second storing means;

recording in the memory the new site of said non-identified tools;

transferring each of said identified tools located on said second storing means to one of said first storing means and said spindle; and

recording in the memory the new sites of said identified tools.

2. The method according to claim 1 including storing in the memory data corresponding to the position of each of the tools in each of said storing means.

3. The method according to claim 2 including storing in the memory data corresponding to a radius of each of said tools in each of said storing means and spindle.

4. The method according to claim 3 including storing in the memory data corresponding to a length of each of said tools in each of said storing means and spindle.

5. The method of claim 1 wherein said controller operates to track each of said tools by a tool number, by which of the storing means contains each tool, by the position in said storing means, and by a radius and a length.

6. The method according to claim 1 wherein said first storing means comprises a plurality of tool holders each displaceable between a storage position and a position wherein a tool supported thereon may be transferred to and from said spindle.

7. The method according to claim 1 wherein said second storing means is mounted on said machine.

8. The method according to claim 7 wherein said second storing means comprises a tool bar changer mounted on a worktable of said machine.

9. The method according to claim 1 wherein said second storing means is detached from said machine.

10. The method according to claim 1 wherein said process includes segments which require tools, including:

determining prior to each segment of said process whether the required tool for said segment is mounted on said spindle;

identifying the site of said required tool;

dismounting any non-required tool mounted on said spindle;

transferring said dismounted tool to a site on one of said storing means;

transferring said required tool from one of said storing means to said spindle; and

recording the site of said non-required tool in the memory.

11. In a system including a machine operable to perform a process;

a controller including a memory operable to execute a program to cause said machine to perform said process;

a tool head assembly mounted on said machine provided with a spindle and a first means for storing a selected number of tools, operable for selectively displacing each of said tools thereof between a storage position and a position for transfer of said tools to and from said spindle; and

second means for storing a selected number of tools, the second storing means being accessible by said spindle such that said tools can be transferred between said second storing means and said spindle, a method comprising;

storing in the memory the site of each of said tools in one of said first and second storing means and said spindle;

loading a program executable to cause said machine to perform said process in said controller;

executing said program including;

identifying the highest number of tools required to perform said process, which may be accommodated by said first storing means;

transferring each non-identified tool located on said first storing means and said spindle from said first storing means and said spindle to said second storing means;

recording in the memory the new site of said non-identified tools;

transferring each of said identified tools located on said second storing means to one of said first storing means and said spindle; and

recording in the memory the new sites of said identified tools.

12. The method according to claim 11 including storing in the memory data corresponding to the positions of each tool in each of said storing means.

13. The method according to claim 12 including storing in the memory data corresponding to a radius of each of said tools in each of said storage means.

14. The method according to claim 11 including storing in the memory data corresponding to a length of each of said tools in each of said storage means.

15. The method according to claim 11 wherein said controller is operable to track each of said tools by a tool number, by which of the storing means contains each tool be the position in said storing means, and by a radius and a length.

16. The method according to claim 11 wherein said first storing means comprises a plurality of tool holders, each displaceable between a storage position and a position wherein a tool held therein may be transferred to and from said spindle.

17. The method according to claim 11 wherein said second storing means is mounted on said machine.

18. The method according to claim 17 wherein said second storing means comprises a tool bar changer mounted on a worktable on said machine.

19. The method according to claim 11 wherein said second storing means is detached from said machine.

20. The method according to claim 11 wherein said process includes segments which require tools, including:

determining prior to each segment of said process whether the required tool for said segment is mounted on said spindle;

identifying the site of said required tool;

dismounting any non-required tool mounted on said spindle;

transferring said dismounted tool to a site on one of said storing means;

transferring said required tool from one of said storing means to said spindle; and

recording the site of said non-required tool in the memory.