Belt accumulation conveyor

• US 5,810,158 A
• Filed: 12/21/1995
• Issued: 09/22/1998
• Est. Priority Date: 12/21/1995
• Status: Expired due to Fees

• Current Assignee: Dematic Corporation
• Original Assignee: Mannesmann Dematic Rapistan Corp. (Siemens AG)
• Inventors: Burrous, James C., Schiesser, Ricardo N.
• Primary Examiner(s): Valenza, Joseph E.
• Application Number:
  US08/576,332
• Time in Patent Office: 1,006 Days
• Field of Search: 198/721, 198/725, 198/809, 198/718, 198/460.1
• US Class Current: 198/809
• CPC Class Codes: B65G 2203/042 Sensors
• CPC Class Codes: B65G 47/268 by means of belt or chain conveyor

Abstract

A belt accumulation conveyor includes at least one driven endless conveying member defining a conveying surface and at least one brake surface lateral of the endless conveying member. A plurality of longitudinal members are arranged in tandem, defining a plurality of accumulation zones. Each of the longitudinal members vertically reciprocates a portion of either the conveying surface or the brake surface. A portion of the conveying surface is elevated above the brake surface to convey objects in that zone and a portion of the brake surface is elevated above the conveying surface to accumulate objects in that zone. A plurality of such actuators are provided and each is operatively connected with adjacent ends of adjacent ones of the longitudinal member. In this manner, the respective adjacent ends can be selectively raised and lowered together.

Claims

1. An accumulation conveyor, comprising:

at least one driven endless conveying member defining an upper conveying surface;

at least one brake surface lateral of said conveying member;

a plurality of elongated longitudinal members arranged in tandem defining a plurality of accumulation zones, each of said longitudinal members vertically reciprocating a portion of said at least one brake surface in order to selectively raise said portion above said conveying surface to thereby accumulate objects in that zone and to selectively lower said portion below said conveying surface to thereby convey objects in that zone; and

a plurality of actuators, each operatively connected with adjacent ends of adjacent ones of said longitudinal members in order to selectively raise and lower said adjacent ends together, wherein each of said actuators includes a member captured in a channel and a device to rotate said member about an axis.

2. The accumulation conveyor in claim 1 wherein said at least one driven endless conveying member comprises a plurality of driven endless conveying members and wherein said at least one brake surface comprises a plurality of brake surfaces interlaced with said plurality of driven endless conveying members.

3. The accumulation conveyor in claim 2 wherein said plurality of brake surfaces are joined together in a brake assembly to operate in unison.

4. The accumulation conveyor in claim 1 wherein said adjacent ends are articulated in a manner which accommodates limited fore and aft movement of adjacent longitudinal members.

5. The accumulation conveyor in claim 1 including a plurality of object sensors for sensing objects on said conveying surface for selectively operating said actuators order to selectively accumulate objects along said conveyor.

6. The accumulation conveyor in claim 5 wherein said actuators are pneumatically operated.

7. The accumulation conveyor in claim 1 wherein said actuators are pneumatically operated.

8. The accumulation conveyor in claim 5 including at least one of said object sensors associated with each of said zones.

9. The accumulation conveyor in claim 1 wherein said driven endless conveying member is a belt.

10. The accumulation conveyor in claim 1 wherein said driven endless conveying member is a padded chain.

11. The accumulation conveyor in claim 1 wherein each of said actuators includes a fore-and-aft restraint for said longitudinal members.

12. The accumulation conveyor in claim 1 wherein said device includes a lever arm pivoted at said axis, said member mounted at one end of said lever arm and a force producing member at the other end of said lever arm.

13. The accumulation conveyor in claim 1 including another member captured in another channel laterally spaced from said channel and another device to rotate said another member about said axis.

14. The accumulation conveyor in claim 13 including a torque tube interconnecting said devices for coordinated movement.

15. The accumulation conveyor in claim 14 including a fore-and-aft restraint for said longitudinal members.

16. The accumulation conveyor in claim 15 wherein said fore-and-aft restraint includes a pair of flanges extending from the associated longitudinal member and straddling said torque tube.

17. An accumulation conveyor, comprising:

at least one driven endless conveying member defining an upper conveying surface;

at least one brake surface lateral of said conveying member;

a plurality of elongated longitudinal members arranged in tandem defining a plurality of accumulation zones, each of said longitudinal members vertically reciprocating a portion of said at least one brake surface in order to selectively raise said portion above said conveying surface to thereby accumulate objects in that zone and to selectively lower said portion below said conveying surface to thereby convey objects in that zone, wherein each of said longitudinal members includes a portion which longitudinally overlaps with a portion of an adjacent one of said longitudinal members; and

a plurality of actuators, each operatively connected with adjacent ends of adjacent ones of said longitudinal members in order to selectively raise and lower said adjacent ends together.

18. The accumulation conveyor in claim 17 wherein said overlapping portions are defined by a knuckle joint having a series of interlaced fingers.

47. The accumulation conveyor in claim 17 wherein said at least one driven endless conveying member comprises a plurality of driven endless conveying members and wherein said at least one brake surface comprises a plurality of brake surfaces interlaced with said plurality of driven endless conveying members.

48. The accumulation conveyor in claim 47 wherein said plurality of brake surfaces are joined together in a brake assembly to operate in unison.

49. The accumulation conveyor in claim 17 wherein said adjacent ends are articulated in a manner which accommodates limited fore and aft movement of adjacent longitudinal members.

50. The accumulation conveyor in claim 17 including a plurality of object sensors for sensing objects on said conveying surface for selectively operating said actuators order to selectively accumulate objects along said conveyor.

51. The accumulation conveyor in claim 50 wherein said actuators are pneumatically operated.

52. The accumulation conveyor in claim 17 wherein said actuators are pneumatically operated.

53. The accumulation conveyor in claim 50 including at least one of said object sensors associated with each of said zones.

54. The accumulation conveyor in claim 17 wherein said driven endless conveying member is a belt.

55. The accumulation conveyor in claim 17 wherein said driven endless conveying member is a padded chain.

56. The accumulation conveyor in claim 17 wherein each of said actuators includes a fore-and-aft restraint for said longitudinal members.

19. An accumulation conveyor, comprising:

a frame;

at least one driven endless conveying member extending substantially the longitudinal length of said frame, the upper surface of said conveying member defining a conveying surface;

a plurality of brake assemblies arranged longitudinally in tandem along said frame, each of said brake assemblies defining an accumulation zone, each of said brake assemblies defining at least two longitudinally elongated brake surfaces on opposite lateral sides of said at least one driven endless conveying member; and

a control system which senses objects on said conveying surface and selectively elevates adjacent ends of adjacent ones of said brake assemblies in order to elevate the brake surfaces of said adjacent brake assemblies above said conveying surface and thereby accumulate objects in the zones defined by said adjacent brake assemblies;

wherein said control system includes an actuator for elevating one of said adjacent ends and wherein said adjacent brake assemblies are joined by an articulation joint in order to elevate the other of said adjacent ends, wherein said articulation joint includes a pin on one of said adjacent brake assemblies engaging a collar on the other of said adjacent brake assemblies.

57. The accumulation conveyor in claim 19 wherein said at least one driven endless conveying member comprises a plurality of driven endless conveying members and wherein said at least one brake surface comprises a plurality of brake surfaces interlaced with said plurality of driven endless conveying members.

58. The accumulation conveyor in claim 57 wherein said plurality of brake surfaces are joined together in a brake assembly to operate in unison.

59. The accumulation conveyor in claim 19 wherein said adjacent ends are articulated in a manner which accommodates limited fore and aft movement of adjacent longitudinal members.

60. The accumulation conveyor in claim 19 including a plurality of object sensors for sensing objects on said conveying surface for selectively operating said actuators order to selectively accumulate objects along said conveyor.

61. The accumulation conveyor in claim 60 wherein said actuators are pneumatically operated.

62. The accumulation conveyor in claim 19 wherein said actuators are pneumatically operated.

63. The accumulation conveyor in claim 60 including at least one of said object sensors associated with each of said zones.

64. The accumulation conveyor in claim 19 wherein said driven endless conveying member is a belt.

65. The accumulation conveyor in claim 19 wherein said driven endless conveying member is a padded chain.

66. The accumulation conveyor in claim 19 wherein each of said actuators includes a fore-and-aft restraint for said longitudinal members.

67. The accumulation conveyor in claim 19 wherein each of said actuators includes a member captured in a channel and a device to rotate said member about an axis.

20. An accumulation conveyor, comprising:

a frame;

at least one driven endless conveying member extending substantially the longitudinal length of said frame, the upper surface of said conveying member defining a conveying surface;

a plurality of brake assemblies arranged longitudinally in tandem along said frame, each of said brake assemblies defining an accumulation zone, each of said brake assemblies defining at least two longitudinally elongated brake surfaces on opposite lateral sides of said at least one driven endless conveying member; and

a control system which senses objects on said conveying surface and selectively elevates adjacent ends of adjacent ones of said brake assemblies in order to elevate the brake surfaces of said adjacent brake assemblies above said conveying surface and thereby accumulate objects in the zones defined by said adjacent brake assemblies;

wherein said control system includes an actuator for elevating one of said adjacent ends and wherein said adjacent brake assemblies are joined by an articulation joint in order to elevate the other of said adjacent ends, wherein each of said actuators includes a member captured in a channel mounted to the associated brake assembly and a device to rotate said member about an axis.

21. The accumulation conveyor in claim 20 wherein said device includes a lever arm pivoted at said axis, said member mounted at one end of said lever arm and a force-producing member at the other end of said lever arm.

22. The accumulation conveyor in claim 20 including another member captured in another channel mounted to the associated brake assembly laterally spaced from said channel and another device to rotate said another member about said axis.

23. The accumulation conveyor in claim 22 including a torque tube interconnecting said devices for coordinated movement.

24. The accumulation conveyor in claim 23 including a fore-and-aft restraint for said longitudinal members.

25. The accumulation conveyor in claim 24 wherein said fore-and-aft restraint includes a pair of flanges extending from the associated longitudinal member and straddling said torque tube.

26. An accumulation conveyor, comprising:

a frame;

at least one driven endless conveying member extending substantially the longitudinal length of said frame, the upper surface of said conveying member defining a conveying surface;

a plurality of brake assemblies arranged longitudinally in tandem along said frame, each of said brake assemblies defining an accumulation zone, each of said brake assemblies defining at least two longitudinally elongated brake surfaces on opposite lateral sides of said at least one driven endless conveying member, wherein each of said brake surfaces includes a portion which longitudinally overlaps with a portion of said brake surface on an adjacent one of said brake assemblies; and

a control system which senses objects on said conveying surface and selectively elevates adjacent ends of adjacent ones of said brake assemblies in order to elevate the brake surfaces of said adjacent brake assemblies above said conveying surface and thereby accumulate objects in the zones defined by said adjacent brake assemblies.

27. The accumulation conveyor in claim 26 wherein said overlapping portions are defined by a knuckle joint having a series of interlaced fingers.

28. The accumulation conveyor in claim 26 wherein said at least one driven endless conveying member includes a plurality of spaced apart driven endless conveying members and wherein said at least two longitudinally elongated brake surfaces includes at least the same number as said plurality of conveying members, said brake surfaces being interlaced with said conveying members.

29. The accumulation conveyor in claim 26 wherein said control system includes a plurality of photodetectors, at least one photodetector for sensing objects at each of said zones, a plurality of pneumatic actuators, each actuator for selectively elevating adjacent ends of adjacent ones of said brake frames in order to elevate the brake surfaces of said adjacent brake frames above said conveying surface, and an electrical controller for operating said pneumatic actuators in response to inputs from said photodetectors.

30. An accumulation conveyor adapted to convey individual packages of goods, comprising:

a frame;

a plurality of driven endless conveying members spaced laterally across said frame, each extending substantially the longitudinal length of said frame, the upper surface of said conveying members defining a conveying surface, wherein each of said conveying members is one of a belt and a padded chain;

a plurality of brake assemblies arranged longitudinally in tandem along said frame, each of said brake assemblies defining an accumulation zone, each of said brake assemblies comprising a unitary member made up of at least three parallel spaced apart brake members each defining a brake surface joined at opposite ends of said brake members by end members, wherein said brake surfaces are interlaced with said conveying members;

wherein adjacent said ends of adjacent ones of said brake assemblies are joined by an articulation joint so that said adjacent ends are elevated in unison; and

a control system which senses packages on said conveying surface and selectively operates a plurality of actuators, each actuator for elevating one of said adjacent ends of adjacent brake assemblies in order to elevate the brake surfaces of said adjacent brake assemblies above said conveying surface and thereby accumulate packages in the zones defined by said adjacent brake assemblies;

wherein said actuators concurrently elevate opposite sides of each said unitary member in unison, wherein all of said brake surfaces of that unitary member are elevated together.

38. The accumulation conveyor in claim 30 wherein each of said actuators resists fore-and-aft movement of said unitary member.

39. The accumulation conveyor in claim 30 wherein each of said actuators includes at least one cylindrical member, a mechanism for translating rotation of said at least one cylinder to elevating of the associated one of said adjacent ends and a mechanism for rotating said at least one cylindrical member.

40. The accumulation conveyor in claim 39 wherein each said actuators includes a pneumatic cylinder connected with said at least one cylindrical member by a lever which translates linear motion to rotational motion.

41. The accumulation conveyor in claim 39 wherein each of said actuators includes a pair of said cylindrical members on opposite sides of said unitary member, a torque tube interconnecting said cylindrical member for coordinated movement and a device to rotate said cylindrical members.

42. The accumulation conveyor in claim 30 wherein said articulation joint includes a pin on said end of one of said adjacent brake assemblies engaging a collar on said end of the other of said adjacent brake assemblies.

43. The accumulation conveyor in claim 30 wherein said actuators are pneumatically operated.

44. The accumulation conveyor in claim 30 including at least one of said object sensors associated with each of said zones.

45. The accumulation conveyor in claim 30 wherein said at least three braking members includes at least five braking members.

46. The accumulation conveyor in claim 30 wherein each of said actuators elevate said brake surfaces approximately one-quarter inch above said conveying members in order to accumulate packages of goods.

31. An accumulation conveyor, comprising:

a frame;

a plurality of driven endless conveying members spaced laterally across said frame, each extending substantially the longitudinal length of said frame, the upper surface of said conveying members defining a conveying surface;

a plurality of brake assemblies arranged longitudinally in tandem along said frame, each of said brake assemblies defining an accumulation zone, each of said brake assemblies defining a plurality of brake surfaces interlaced with said conveying members;

wherein adjacent ends of adjacent ones of said brake assemblies are joined by an articulation joint so that said adjacent ends are elevated in unison, wherein said articulation joint includes a pin on one of said adjacent brake assemblies engaging a collar on the other of said adjacent brake assemblies; and

a control system which senses objects on said conveying surface and selectively operates a plurality of actuators, each actuator for elevating one of said adjacent ends of adjacent brake assemblies in order to elevate the brake surfaces of said adjacent brake assemblies above said conveying surface and thereby accumulate objects in the zones defined by said adjacent brake assemblies.

32. An accumulation conveyor, comprising:

a frame;

a plurality of driven endless conveying members spaced laterally across said frame, each extending substantially the longitudinal length of said frame, the upper surface of said conveying members defining a conveying surface;

a plurality of brake assemblies arranged longitudinally in tandem along said frame, each of said brake assemblies defining an accumulation zone, each of said brake assemblies defining a plurality of brake surfaces interlaced with said conveying members;

wherein adjacent ends of adjacent ones of said brake assemblies are joined by an articulation joint so that said adjacent ends are elevated in unison; and

a control system which senses objects on said conveying surface and selectively operates a plurality of actuators, each actuator for elevating one of said adjacent ends of adjacent brake assemblies in order to elevate the brake surfaces of said adjacent brake assemblies above said conveying surface and thereby accumulate objects in the zones defined by said adjacent brake assemblies;

wherein each of said actuators includes a pair of members captured in respective laterally spaced apart channels on the associated brake assembly, a device to rotate each of said members about an axis and a torque tube interconnecting said devices along said axis for coordinated movement.

33. The accumulation conveyor in claim 32 wherein each of said devices includes a lever arm pivoted at said axis, the associated member mounted at one end of the respective lever arm, and a force-producing member at the other end of one of said lever arms.

34. The accumulation conveyor in claim 32 including a fore-and-aft restraint for said longitudinal members.

35. The accumulation conveyor in claim 34 wherein said fore-and-aft restraint includes a pair of flanges extending from the associated longitudinal member and straddling said torque tube.

36. An accumulation conveyor, comprising:

a frame;

a plurality of driven endless conveying members spaced laterally across said frame, each extending substantially the longitudinal length of said frame, the upper surface of said conveying members defining a conveying surface;

a plurality of brake assemblies arranged longitudinally in tandem along said frame, each of said brake assemblies defining an accumulation zone, each of said brake assemblies defining a plurality of brake surfaces interlaced with said conveying members, wherein each of said brake surfaces includes a portion which longitudinally overlaps with a portion of said brake surface on an adjacent one of said brake frames;

wherein adjacent ends of adjacent ones of said brake assemblies are joined by an articulation joint so that said adjacent ends are elevated in unison; and

a control system which senses objects on said conveying surface and selectively operates a plurality of actuators, each actuator for elevating one of said adjacent ends of adjacent brake assemblies in order to elevate the brake surfaces of said adjacent brake assemblies above said conveying surface and thereby accumulate objects in the zones defined by said adjacent brake assemblies.

37. The accumulation conveyor in claim 36 wherein said overlapping portions are defined by a knuckle joint having a series of interlaced fingers.