Assembly line system

• US 5,109,974 A
• Filed: 03/27/1991
• Issued: 05/05/1992
• Est. Priority Date: 05/11/1990
• Status: Expired due to Fees

• Current Assignee: Menziken Automation MAT AG
• Original Assignee: Menziken Automation MAT AG
• Inventors: Beer, Christian, Wyss, Alois, Wassmer, Christoph
• Primary Examiner(s): Valenza, Joseph E.
• Assistant Examiner(s): Nguyen, Tuan N.
• Application Number:
  US07/675,642
• Time in Patent Office: 405 Days
• Field of Search: 198/345.1, 198/345.3, 198/346.1, 29/33 P, 29/563
• US Class Current: 198/346.1
• CPC Class Codes: B23P 21/004 the units passing two or more work-stations whilst being composed
• CPC Class Codes: B23Q 7/1426 with work holders not rigidly fixed to the transport devices B23Q7/005, B23Q7/035 take precedence
• 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: Y10T 29/5196 Multiple station with conveyor

Abstract

To increase the overall operating speed of a production, assembly or manufacturing line system, a rapid transport system (6-17) is located beneath normally slow-moving transport belts (3), coupled to a vertical raising system (8, 9), engageable beneath a transport plate between individual belts of the transport system, and rapidly moving a transport plate (2) into and off selected work stations, faster than the movement of the belts. Preferably, the raising system is coupled to a carriage (6) which, in turn, is moved rapidly along the transport path (A, B) by a piston-cylinder unit (16, 17), a motor with a gear belt, or any other similar linear motion transmission.

Claims

1. Assembly system having

a plurality of transport plates (2) for transporting workpieces (4) thereon;

a continuously moving transport belt arrangement (3) positioned below the transport plates and having a belt run in engagement with the transport plates for transporting said transport plates along a predetermined transport path (A) at a predetermined transport speed and spaced from each other;

work stations (WS) located along said path for permitting operation of said workpieces thereat,

and comprising, in accordance with the invention,

a rapid transport carriage (6) located below the transport plates (2);

means (14,

     18) for guiding said carriage (6) in a path (B) parallel to said transport path (A);

linear motion drive means (14, 16,

     17) coupled to said rapid transport carriage (6) for moving said carriage in a rapid transport direction (B) at a speed which is higher than the transport speed of the transport belt arrangement (3);

lifting means (8,

     9) projecting from the rapid transport carriage (6) towards said transport plates and selectively projectionable or retractable to engagement with, or release from, a selected transport plate (2), positioned above said carriage, for rapid shifting of the selected transport plate along said predetermined transport path (A), including at least one positioning projection (10) which, with respect to said rapid transport direction (B), is located in advance of the engaged transport plate (2) to push away a transport plate which was previously located at said work station (WS).

2. The system of claim 1, further including stop means (S) at the work stations (WS) for arresting the transport plates at the work stations.

3. The system of claim 1, wherein said drive means (14, 16, 17) has an operating length which is dimensioned to be longer than, and up to about twice the length of one of the transport plates (2).

4. The system of claim 1, wherein said drive means comprises a fluid-operated piston-cylinder (16, 17) system.

5. The system of claim 4, wherein said fluid-operated piston-cylinder system comprises a compressed air system.

6. The system of claim 1, wherein said lifting means comprises at least parallel, vertically operating lifting elements (8).

7. The system of claim 6, wherein said lifting elements comprise pneumatic short-stroke piston-cylinder combinations.

8. The system of claim 1, wherein said drive means (14, 16, 17) has an operating length which is dimensioned to extend as long as about twice the length of one of the transport plates (2).

9. The system (16, 17) of claim 4, wherein the stroke length of said piston-cylinder system is about twice the length of one of said transport plates.

10. The system of claim 4, wherein the stroke length of said piston-cylinder system (16, 17) is dimensioned to be longer than, and up to about twice the length of one of the transport plates.

11. Assembly system having

a plurality of transport plates (2) for transporting workpieces (4) thereon;

a continuously moving transport belt arrangement (3) positioned below the transport plates and having a belt run in engagement with the transport plates for transporting said transport plates along a predetermined transport path (A) at a predetermined transport speed;

work stations (WS) located along said path for permitting operation of said workpieces thereat, stop means (S) at the work stations (WS) for arresting the transport plates at the work stations,

and comprising, in accordance with the invention,

a rapid transport carriage (6) located below the transport plates (2) with a fluid-operated piston-cylinder system (16,

     17)

means (14,

     18) for guiding said carriage (6) in a path (B) parallel to said transport path (A);

drive means (14, 16,

     17) coupled to said rapid transport carriage (6) for moving said carriage at a speed which is higher than the transport speed of the transport belt arrangement (3); and

lifting means (8,

     9) projecting from the rapid transport carriage (6) towards said transport plates and selectively projectionable or retractable to engagement with, or release from, a selected transport plate (2), positioned above said carriage, for rapid shifting of the selected transport plate along said predetermined transport path (A) said lifting means (8,

     9) comprising an engagement element (9) engageable from below against the selected transport plate; and

said lifting elements comprise pneumatic short-stroke piston-cylinder combinations

locating and positioning projections (10) formed on said engagement element (9) for positioning a selected, engaged transport plate and ensuring movement of said transport plate upon rapid transport of the engagement element (9) coupled to said rapid transport carriage (6), including at least one positioning projection (10) which, with respect to said rapid transport direction (B), is located in advance of the engaged transport plate (2) to push away a transport plate which was previously located at said work station (WS).

12. The system of claim 11, wherein said drive means (14, 16, 17) comprises a linear motion transmission means.

13. The system of claim 11, wherein the fluid operating said fluid-operated piston-cylinder system comprises a compressed air system.

14. The system of claim 11, wherein said short stroke piston-cylinder combinations comprise at least essentially parallel, vertically operating lifting cylinder-piston units.

15. The system of claim 11, wherein the stroke length of said piston-cylinder system (16, 17) is about twice the length of one of said transport plates.

16. The system of claim 11, wherein the stroke length of said piston-cylinder system (16, 17) is dimensioned to be longer than, and up to about twice the length of one of the transport plates.

17. The system of claim 11, including at least one positioning projection (10) which, with respect to said rapid transport direction (B), is located in advance of the engaged transport plate (2) to push away a transport plate which was previously located at said work station (WS).

18. The system of claim 16, including at least one positioning projection (10) which, with respect to said rapid transport direction (B), is located in advance of the engaged transport plate (2) to push away a transport plate which was previously located at said work station (WS).