Drive for linear pick-and-place assembly apparatus

• US 5,345,831 A
• Filed: 06/22/1993
• Issued: 09/13/1994
• Est. Priority Date: 06/22/1993
• Status: Expired due to Term

• Current Assignee: Emerson Electric Company
• Original Assignee: Emerson Electric Company
• Inventors: Sandrock, Don G.
• Primary Examiner(s): Herrmann, Allan D.
• Application Number:
  US08/080,315
• Time in Patent Office: 448 Days
• Field of Search: 74/53, 198/468.6, 198/774.3, 414/733
• US Class Current: 74/53
• CPC Class Codes: B23Q 1/621 a single sliding pair followed perpendicularly by a single sliding pair
• CPC Class Codes: B23Q 5/341 cam-operated
• CPC Class Codes: B65G 25/02 the carrier or impeller having different forward and return paths of movement, e.g. walking beam conveyors
• CPC Class Codes: F16C 2322/39 General build up of machine tools, e.g. spindles, slides, actuators in general B23Q
• CPC Class Codes: F16C 29/045 having rolling elements journaled in one of the moving parts
• CPC Class Codes: F16H 25/16 for interconverting rotary motion and oscillating motion
• CPC Class Codes: Y10T 74/1828 Cam, lever, and slide

Abstract

An improved drive apparatus for use with linear pick-and-place assembly devices is disclosed, which drive apparatus includes a movable carriage having an improved guide track assembly. The guide track assembly comprises a series of V-rollers and mating V-tracks to provide the vertical and horizontal translational movements for a linear pick-and-place assembly device'"'"'s output member. The guide track assembly includes V-roller elements which can be eccentrically adjusted to create a tight, pre-loaded sliding engagement with the mating V-tracks, all so as to substantially eliminate any undesired end play movement within the movable carriage.

Claims

1. A pick-and-place assembly for moving work pieces cyclically between adjacent work stations, said assembly comprising:

an input shaft rotably mounted in a housing and having a lift cam and a translator cam mounted thereon;

first and second output shafts rotably mounted in said housing generally transverse to said input shaft;

a first cam follower mounted on said first output shaft and engaging said translator cam, and a second cam follower mounted on said second output shaft and engaging said lift cam;

a carriage plate disposed in said housing and having a first set of V-rollers mounted thereon for slidably engaging respective V-tracks mounted on a carriage guide bar in said housing, said carriage plate having a second set of V-rollers mounted thereon and positioned to slidably receive respective V-tracks mounted on a translator bar;

a translator arm having a first end mounted on said first output shaft and a distal end positioned to engage said translator bar such that when said input shaft is rotated, said translator arm imparts horizontal movement to said translator bar; and

a lift arm having a first end mounted on said second output shaft and a distal end connected to said carriage plate such that when said input shaft is rotated, said lift arm impacts vertical movement to said carriage plate and said translator bar.

2. The invention of claim 1 wherein said lift cam and said translator cam are roller gear cams.

4. The invention of claim 1 wherein said first set of V-rollers mounted on said carriage plate includes four V-rollers and said V-tracks comprise a first V-track mounted on one side of said carriage guide bar and a second V-track mounted on the other side of said carriage guide bar, whereby a first pair of said V-rollers engages said first V-track and a second pair of said V-rollers engages said second V-track.

5. The invention of claim 4 wherein one of said pair of said V-rollers is each mounted on an eccentric bushing which allows the V-roller to be pre-loaded against said V-tracks.

6. The invention of claim 1 wherein said second set of V-rollers mounted on said carriage plate includes four V-rollers and said V-tracks comprise a first V-track mounted along an upper edge of said translator bar and a second V-track mounted along a lower edge of said translator bar, whereby a first pair of said V-rollers engages said first V-track and a second pair of said V-rollers engages said second V-track. said V-rollers is each mounted on an eccentric bushing which allows said V-rollers to be pre-loaded against said V-tracks.

7. The invention of claim 6 wherein one of said pair of said V-rollers is each mounted on an eccentric bushing which allows said V-rollers to be pre-loaded against said V-tracks.

8. The invention of claim 1 wherein said input shaft and said translator bar are substantially mounted in the same plane.

9. The invention of claim 1 wherein said housing has a center line and said translator bar and said input shaft are positioned in parallel alignment along said center line.

10. The invention of claim 1 wherein a plurality of said linear pick-and-place assemblies are closely spaced in parallel alignment and said input shafts are driven by a common drive shaft.

11. The invention of claim 10 wherein said input shafts each have a beveled gear mounted thereon to engage one of a plurality of beveled gears mounted along said common drive shaft.

12. The invention of claim 1 wherein a plurality of said linear pick-and-place assemblies are radially positioned substantially equidistant about a central axis, said plurality of assemblies each having said input shafts connected to a common drive means.

13. The invention of claim 12 wherein each of said input shafts has a beveled gear disposed thereon and in engagement with a central bevel gear connected to a drive means.

3. The invention of claim 3 wherein said carriage guide bar is fixedly mounted to said housing.