Method of assembling an automated modular tool

Abstract

A method and apparatus are disclosed for assembling an end effector for an automated modular tool. A processor is programmed with data corresponding to a portion of a part surface at a designated location. A setting fixture is driven with a plurality of linear motion actuators to a selected three-dimensional location relative to an adaptor bar of the modular tool that is attached to a frame. A tool setting head is rotated with a rotary drive. A platen is tilted with at least one platen tilting motor and gear set to angularly orient the platen to correspond to an angular orientation of the portion of the part surface at the designated location. An end effector is then placed on the platen and secured with a tooling arm to the adaptor bar.

Claims

1. A method of assembling an automated modular tool comprising: programming a processor with data corresponding to a portion of a part surface at a designated location; providing a frame; driving a mast with a plurality of linear motion actuators to a selected three-dimensional location relative to an adaptor bar attached to the frame; rotating a tool setting head of the mast with a rotary drive; pivoting a platen with at least one platen tilting motor and at least one gear set to angularly orient the platen to correspond to an orientation of the portion of the part surface at the designated location; and placing an end effector on the platen and securing the end effector to the adaptor bar with an arm.

2. The method of claim 1 wherein the step of driving the mast further comprises: moving a rail in an X direction with an X axis linear actuator on a pair of spaced parallel tracks; and moving the mast in a Y direction with a Y axis linear actuator along a length of the rail to a selected X-Y location upon the data.

3. The method of claim 2 wherein the X axis linear actuator and Y axis linear actuator are both rack and pinion gear sets.

4. The method of claim 2 wherein the step of driving the mast further comprises: moving the mast in a Z direction with a Z axis linear actuator to a selected Z location based upon the data.

5. The method of claim 4 wherein the Z axis linear actuator is a worm gear and a worm gear drive.

6. The method of claim 1 wherein the step of rotating the tool setting head further comprises: rotating the tool setting head within a range of at least 180 degrees about a Z axis extending through the platen.

7. The method of claim 6 wherein the step of pivoting the platen is performed with the at least one platen tilting motor driving a first pinion gear and a first arcuate gear, and a second platen tilting motor driving a second pinion gear and a second arcuate gear oriented perpendicular to the first arcuate gear.

8. The method of claim 1 further comprising: marking the platen with visible indicia corresponding to a shape of the end effector; and locating the end effector in alignment with the visible indicia.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of an apparatus for setting the position of an end effector of an automated modular tool.

(2) FIG. 2 is a front elevation view of the apparatus for setting the position of an end effector of an automated modular tool shown in FIG. 1.

(3) FIG. 3 is a side elevation view of the apparatus for setting the position of an end effector of an automated modular tool shown in FIG. 1.

(4) FIG. 4 is a plan view of a platen with the platen being rotated as shown in phantom lines.

(5) FIG. 5 is a fragmentary view of a stepper motor, pinion gear, and rack gear generally referred to as a linear actuator for positioning the FIG. 6 is a perspective view of the tool setting head.

(6) FIG. 7 is a perspective view of the tool setting head.

(7) FIG. 8 is a side elevation view of the tool setting head.

(8) FIG. 9 is a front elevation view of the tool setting head in a centered position.

(9) FIG. 10 is a front elevation view of the tool setting head in a position pivoted to the left side.

(10) FIG. 11 is a front elevation view of the tool setting head in a position pivoted to the right side.

(11) FIG. 12 is a perspective view of the tool setting head.

(12) FIG. 13 is a perspective view of the tool setting head and a Z axis worm gear type of linear actuator.

(13) FIG. 14 is a diagrammatic cross-section view of the Z axis worm gear type linear actuator.

(14) FIG. 15 is an exploded perspective view of selected parts of the tool setting head.

DETAILED DESCRIPTION

(15) The illustrated embodiments are disclosed with reference to the drawings. However, it is to be understood that the disclosed embodiments are intended to be merely examples that may be embodied in various and alternative forms. The figures are not necessarily to scale and some features may be exaggerated or minimized to show details of particular components. The specific structural and functional details disclosed are not to be interpreted as limiting, but as a representative basis for teaching one skilled in the art how to practice the disclosed concepts.

(16) Referring to FIGS. 1-3, an end effector positioning apparatus generally indicated by reference numeral 10 is disclosed. The end effector positioning apparatus 10 includes a frame 12 that is supported on a set of legs 14. The legs 14 are connected in a spaced relationship by crossbars 16. An adaptor bar retainer 18 holds an adaptor bar 20 in a fixed position on the frame 12.

(17) The frame 12 supports right and left tracks 22 in a spaced relationship relative to the ground or floor. The right and left tracks 22 extend in an X direction, or along an X axis, and are spaced from and parallel to each other. A rail 24 is assembled to both tracks 22 and extends in the Y direction, or along a Y axis. The rail 24 is disposed perpendicular to the tracks 22. An X axis linear actuator 28 functions to move the rail 24 in the X direction.

(18) A mast 30 is assembled to the rail 24 and is movable in the Y direction relative to the rail 24. The mast 30 is illustrated in FIGS. 1-3 to extend below the rail 24 and is movable in a Z direction, or along a Z axis. The mast 30 also moves in the X axis when the rail 24 is moved along the tracks 22. A tool setting head 36 is attached to an upper end of the mast 30. The mast 30 may be maintained in a lowered position with the tool setting head 36 adjacent the rail 24 to avoid contacting a tooling arm or previously positioned end effector as will be described below. Once positioned in the X and Y directions the mast 30 is raised in the Z direction to the desired height by a Z axis actuator 38.

(19) Referring to FIGS. 3 and 4, a rotary drive 40 is provided between the tool setting head 36 and the mast 30 to rotate the platen 42 as indicated by the arcuate arrow in FIG. 4 to a desired orientation. The rotary drive 40 may rotate more than 180 degrees but less than 360 if two tilt mechanisms are provided. If two tilt mechanisms are provided the rotary drive 40 and tilt mechanisms may be more simply wired to the control system. Alternatively, the rotary drive 40 may be fully rotatable about 360 degrees of rotation if a single tilt mechanism is provided but care must be taken to avoid wrapping the wiring as the tool setting head is manipulated.

(20) Referring specifically to FIG. 2, a first arcuate motion actuator 46 is shown that pivots the platen about a first tilt axis T.sub.1.

(21) Referring specifically to FIG. 3, a second arcuate motion actuator 50 is shown that pivots the platen about a second tilt axis T.sub.2.

(22) The first and second arcuate motion actuators 46 and 50 are rotated with the rotary drive 40 to permit orienting the platen 42 in a wide variety of planar positions to correspond to any desired orientation of a portion of a part surface.

(23) Referring to FIGS. 1-3, a controller 54 communicates with the actuators through a motor control panel 56. The controller 54 may be a lap top computer as illustrated or another type of programmable controller. The controller 54 is programmed either with CAD data or by manually input data corresponding to a portion of a production part surface at a designated location. The controller 54 controls the X axis linear actuator 28, Y axis linear actuator 32, the Z axis linear actuator 38, the rotary drive 40, and the first and second arcuate motion actuators 46 and 50.

(24) Referring to FIG. 5, one example of a linear motion actuator (e.g. 28, 32) is shown to include a drive motor 60 (e.g. a stepper motor) that rotates a pinion gear 62. The pinion gear 62 traverses the rack gear 64 to drive the rail 24 along the tracks 22 or to drive the mast 30 along the rail 24. While the example given is a stepper motor, a servomotor could also be used to drive the rail 24 along the tracks 22 or drive the mast 30 along the rail 24. In another embodiment, the motor 60 could be a conventional electric motor and an encoder capable of accurately positioning the rail 24 and mast 30.

(25) Referring to FIGS. 6-8, the first arcuate motion actuator 46 is shown in greater detail. A drive motor 68 rotates a pinion gear 70 to pivot an arcuate gear 72. The first arcuate motion actuator 46 is operative to tilt the platen 42 about the second tilt axis T.sub.2.

(26) The tilting movement about the axis T.sub.2 is shown in FIGS. 9-11. In FIG. 9, the platen 42 is not tilted and is in a centered orientation. In FIG. 10, the platen 42 is tilted toward the right side of the figure and the arcuate gear 72 is shifted to the left side of the view. In FIG. 11, the platen 42 is tilted toward the left side of the figure and the arcuate gear 72 is shifted to the right side of the view.

(27) With continued reference to FIGS. 9-11, the second arcuate motion actuator 50 is shown that is operative to tilt the platen 42 about the first tilt axis T.sub.1. A drive motor 74 rotates a pinion gear 76 that engages the arcuate gear 78. The tilting movement about the first tilt axis T.sub.1 is shown in FIG. 8 by the arcuate arrow at the top of the figure. The solid lines illustrate the platen 24 in the neutral position and the phantom lines show the platen 24 being tilted about the first tilt axis T.sub.1.

(28) Referring to FIG. 12, the tool setting head is shown in perspective to illustrate the relationship of the first arcuate motion actuator 46 and the second arcuate motion linear actuator 50. Concave tracks 80 are engaged by two rollers 82 on opposite sides of the tool setting head 36 to assure a smooth tilting movement about the axis T.sub.1. Convex tracks 84 ride on two rollers 86 on opposite sides of the tool setting head 36 to assure a smooth tilting movement about the axis T.sub.2.

(29) Referring to FIGS. 13 and 14, the Z axis linear actuator 38 is illustrated in greater detail. A worm gear 88 is rotated by a drive motor 90 within an internal worm gear 91 to raise and lower the mast 30. The worm gear 88 and internal worm gear 91 provide a robust lifting mechanism that resists deflection of the tool setting head 36 due to the weight of the tool setting head 36 and any loads applied to the tool setting head 36. A stepper motor and rack and pinion gear set as shown in FIG. 5 could be used instead of the worm gear drive as illustrated, if desired.

(30) Referring to FIG. 15, the tool setting head 36 and Z axis linear actuator 38 are shown in an exploded perspective view with the drives shown but with some of the structural components eliminated to simplify the view. The platen 42 is marked with indicia 92 comprising a circular marking for locating a suction cup end effector. Other indicia may also be provided such as intersecting lines or other shapes the platen 42 is attached to a pair of mounting plates 94. A pair of arcuate members 96 that include the convex tracks 84 is attached to the mounting plates 94. The platen 42 and mounting plates 94 are tilted by the drive motor 74 rotating the pinion gear 76 that engages the arcuate gear 78 to tilt the platen about the axis T.sub.1.

(31) The platen 42 is also tilted about the tilt axis T.sub.2 by actuating the drive motor 68 that rotates the pinion gear 70. The pinion gear engages the arcuate gear 72 to tilt the platen 42 about the axis T.sub.2. Rollers 82 are attached to arcuate flanges 96 and ride on the concave tracks 80 provided on plates 98 that are assembled to opposite sides of the tool setting head 36.

(32) The Z axis linear actuator 38 includes the worm gear 88 that is driven by the drive motor 90 to raise and lower the mast 30 by rotating the worm gear 88 inside the internal worm gear 91. The mast 30 is raising and lowered to position the tool setting head at the desired height on the Z axis.

(33) The platen is located on the X, Y, and Z axes and the tool setting head 36 is oriented by the rotary drive 40 and the first and second arcuate motion actuators 46 and 50. With the platen 42 properly located, the end effector 100, shown in FIG. 1, is placed in alignment with the indicia 92 on the platen 42. The indicia 92 for a vacuum cup 100 is a circle as shown but for a sensor or gripper other indicia may be used. The vacuum cup 100 is secured in placed on the arm 102 that is attached to the adaptor bar 20 and a vacuum line 104 is also connect to a source of vacuum through the adaptor bar 20. If an electrical device is attached to the arm 102 electrical wiring may be attached via the adaptor bar 20 is stead of the vacuum line 104.

(34) The adaptor bar retainer 18 is attached to the frame 12 and is configured to hold the adaptor bar 20 in a fixed location. The arm 102 is adapted to be installed on an automated modular tool and is assembled to the adaptor bar 18 when an end effector 100, such as a vacuum cup, is disposed on the platen. The arm 102 and vacuum cup 100 are then locked at a data defined location.

(35) The adaptor bar retainer 18 is pivotably attached to the frame 12 and is adapted to be rotated on the frame 12 and selectively fixed in a plurality of fixed locations. A plurality of adaptor bars 20 are assembled to a plurality of sides of the adaptor bar retainer 18. Generally, four adaptor bars 20 are used to pick up parts at a loading or unloading production operation and all four adaptor bars 20 may be set up by rotating the adaptor bar retainer 18 in 90 rotation increments. At least one arm 102 of an automated modular tool is assembled to each of the adaptor bars 20. The adaptor bar retainer 18 is pivoted on the frame to set up each of the adaptor bars 20 for a selected station of the automated modular tool.

(36) The embodiments described above are specific examples that do not describe all possible forms of the disclosure. The features of the illustrated embodiments may be combined to form further embodiments of the disclosed concepts. The words used in the specification are words of description rather than limitation. The scope of the following claims is broader than the specifically disclosed embodiments and also includes modifications of the illustrated embodiments.