Generative measuring system

• US 5,505,003 A
• Filed: 04/21/1994
• Issued: 04/09/1996
• Est. Priority Date: 10/08/1993
• Status: Expired due to Fees

• Current Assignee: M&M Precision Systems Corporation
• Original Assignee: M&M Precision Systems Corporation
• Inventors: Evans, Michael, Parker, Michael A., Ullery, Steven, Denison, Charles W. Jr., Lombardo, A. Michael
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Assistant Examiner(s): Bennett, G. Bradley
• Application Number:
  US08/230,898
• Time in Patent Office: 719 Days
• Field of Search: 33/1 M, 33/501.7, 33/501.14, 33/501.15, 33/503, 33/504, 33/505, 33/546, 33/549, 33/551, 33/556, 33/559, 33/572, 33/573, 33/DIG. 15
• US Class Current: 33/501.7
• CPC Class Codes: G01B 5/20 for measuring contours or curvatures

Abstract

A monitoring system having a stylus mounted to a support that controllably moves the stylus along a travel path as it contacts an object of interest. The object is supported by a rotating turntable and held in place by a manually actuatable retainer that exerts a repeatable downward force on the object. A frame that supports the stylus is supported by a flexure plate that makes the task of orienting the frame easier. The frame supports a saddle that can be raised and lowered by a belt system driven by a D.C. pancake motor. The entire monitoring system achieves a required degree of accuracy in monitoring object shape at a reduced manufacturing cost.

Claims

1. A monitoring system having a stylus mounted for movement along a controlled travel path for monitoring an object'"'"'s shape comprising:

a) a stationary base having a generally level support surface for mounting structure supporting a stylus for movement along a controlled travel path;

b) a moveable frame having an arm that extends away from said frame and supports the stylus to orient the stylus relative to the base;

c) structure supported by the stationary base to define a travel path for the moveable frame relative to the base comprising;

i) a guide attached to the stationary base that defines the travel path for said frame;

ii) a moveable base coupled to the guide for constrained movement along the travel path; and

iii) a flexure plate at attached to the frame and connected to the moveable base by means of multiple spaced connectors which can be loosened and tightened to adjust an orientation of the frame relative to the stationary base during set up of the monitoring system; and

d) a motor supported by the stationary base and coupled to the frame for moving the frame relative the stationary base along the travel path defined by the guide.

2. The monitoring system of claim 1 which further comprises an object support for securing an object to be examined in spaced relation to the frame, said object support comprising a vertical column including a magnetic portion and a moveable object retaining member supported for up and down movement relative to the column and including a magnet whose position relative to the magnetic portion of the column can be adjusted to fix the object retaining member relative the column.

3. The monitoring system of claim 1 additionally comprising an additional guide attached to the frame for supporting a vertically moveable probe support, a driven pulley coupled to said frame at one end of the additional guide and an idle pulley coupled to the frame at an opposite end of said additional guide, a first belt that engages the driven and idle pulleys and connects to the moveable probe support to move the probe support up and down;

and a second motor coupled to the frame for rotating the driven pulley.

4. The monitoring system of claim 2 wherein the object support further comprises a turntable, a motor coupled to the turntable for turning the turntable, and a turntable support comprising a precisely ground bearing set coupled to the motor for rotating the turntable.

5. The monitoring system of claim 2 wherein the frame comprises spaced apart upright columns supporting a probe support by means of a track for guiding the probe support in a direction orthogonal to movement of the frame and further comprising a belt attached to the probe support for moving the probe support along the orthogonal direction.

6. The monitoring system of claim 4 wherein the object support comprises spaced apart object contacting members, one contacting member coupled to the turntable and a second rotatable object contacting member connected to the moveable object retaining member.

7. The monitoring system of claim 6 wherein the moveable object retaining member comprises a base and a bearing set for supporting said second object contacting member relative to the base.

8. The monitoring system of claim 7 wherein the moveable object retaining member further comprises rotation limiting means for limiting rotation of the second object contacting member until the object retaining member is fixed with respect to the column.

9. The monitoring system of claim 3 additionally comprising a second belt that overlies the first belt and holds the probe support in the event the first belt breaks.

10. The monitoring system of claim 1 which further comprises an object support for securing an object to be examined in a position relative the frame, said object support comprising an upright column that supports a movable object retainer and a manually controllable pneumatic actuator that raises and lowers the object retainer along the upright column to secure the object between the object retainer and the object support.

11. A method of monitoring an object'"'"'s shape comprising the steps of:

mounting an object support for rotation about a vertical rotation axis;

fixing a support column relative to the object support and connecting an object retaining member to the support column for linear up and down movement along a travel path that brings the object retaining member into contact with an object on the object support;

manually moving the object retaining member into engagement with the object to fix the object in place relative to the column and activating a visual indicator corresponding to a downward force of engagement between the object retaining member and the object to indicate to a user when the object is secured for inspection; and

rotating the object support while contacting the object with a stylus having a position sensor for monitoring the object'"'"'s shape.

12. The method of claim 11 wherein the object retaining member is supported by a bearing to allow rotation of the object retaining member about the vertical axis and wherein during the step of moving the object retaining member up and down the object retaining member is prevented from such rotation.

13. The method of claim 12 wherein the column has an exposed ferro-magnetic surface and a retainer base which includes a magnet which is moved toward the ferro-magnetic surface to lock the object retaining member in position while freeing the object retaining member for rotation.

14. The method of claim 11 wherein the stylus is mounted to a moveable frame to bring the stylus into contact with the object during examination of the object'"'"'s shape and wherein prior to examination of the object a support for the frame is leveled by adjusting connectors that connect a flexure plate to a base and flex the plate to correctly orient the frame prior to examination of the object.

15. The method of claim 14 wherein the frame supports a stylus support for up and down movement with respect to the object and wherein the stylus support is connected to a belt that is wound around pulleys attached to the frame and wherein the step of raising and lowering the stylus support is performed by actuating a motor to raise and lower the belt and attached stylus support.

16. A monitoring system having a stylus mounted to a support that can be moved along a controlled travel path as the stylus contacts an object comprising:

a) a stationary base having a generally level support surface for mounting structure supporting a stylus for movement along a travel path;

b) a moveable frame having an arm that extends away from said frame and supports the stylus to position and orient the stylus relative to the base;

c) track means supported by the stationary base to define a travel path for the frame and attached stylus;

d) a rotating turntable including a motor for rotating the turntable and an object supported by the turntable; and

e) structure for securing the object on the turntable as the stylus contacts the object comprising;

i) a rotatable center for contacting the object after the object is placed on the turntable;

ii) a vertical column supporting the rotatable center so that the rotatable center can be raised and lowered relative the turntable to hold the object between the turntable and the rotatable center;

iii) a user-operated actuator having a pneumatically operated cylinder and piston attached to the support for raising and lowering the rotatable center; and

iv) a first visible indicator and means for actuating the first visible indicator to indicate when an appropriate force is applied by the rotatable center to an object on the turntable.

17. The monitoring system of claim 16 wherein the user-operated actuator includes a handle that extends and retracts the piston to raise and lower the rotatable center.

18. The monitoring system of claim 16 additionally comprising a second visible indicator and wherein the means for actuating comprises means to actuate the second visible indicator when too great a force is applied to an object on the turntable.

19. The monitoring system of claim 18 where the first and second visible indicators are light-emitting diodes.

20. A monitoring system having a stylus mounted for movement along a controlled travel path for monitoring an object'"'"'s shape comprising:

a) a stationary base having a generally level support surface for mounting structure supporting a stylus for movement along a controlled travel path;

b) a moveable frame that supports the stylus and positions the stylus relative to the base;

c) structure supporting the moveable frame that orients the frame relative to the base and includes a guide attached to the stationary base to define a travel path for relative movement between the stationary base and said frame; and

d) a motor supported by the stationary base and coupled to the frame for moving the frame relative the stationary base along the travel path;

e) said frame comprising;

i) a pair of vertical supports that extend upward from the stationary base;

ii) a vertically moveable probe support;

iii) a driven pulley coupled to said vertical supports at one end;

iv) an idle pulley coupled at an opposite end of said vertical supports; and

v) two overlapping belts that engage the driven and idle pulleys and connect to the moveable probe support to move the probe support up and down; and

vi) a motor for rotating the driven pulley to move the probe support up and down relative to the stationary base.

21. A monitoring system having a stylus mounted for movement along a controlled travel path for monitoring an object'"'"'s shape comprising:

a) a stationary base having a generally level support surface for mounting a stylus for movement along a controlled travel path;

b) a moveable frame comprising;

i) a pair of vertical supports that extend upward from the stationary base;

ii) a vertically moveable probe support to which the stylus is attached;

iii) a driven pulley coupled to said vertical supports at one end;

iv) an idle pulley coupled at an opposite end of said vertical supports; and

v) a drive belt that engages the driven and idle pulleys and connect to the moveable probe support to move the probe support up and down; and

vi) a motor for rotating the driven pulley to move the probe support up and down relative to the stationary base;

c) structure supporting the moveable frame that orients the frame to the stationary base comprising;

i) a guide attached to the stationary base to define a linear travel path for relative movement between the stationary base and said frame; and

ii) a flexure plate connected to the frame by means of connectors which connect the plate to the frame which can be loosened or tightened to orient the frame and up and down movement of the probe support; and

d) a motor supported by the stationary base and coupled to the frame for moving the frame relative the stationary base along the linear travel path.