Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H1/00—Supports or magazines for piles from which articles are to be separated
  • B65H1/08—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device
  • B65H1/14—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device comprising positively-acting mechanical devices
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B66—HOISTING; LIFTING; HAULING
  • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
  • B66F7/00—Lifting frames, e.g. for lifting vehicles; Platform lifts
  • B66F7/02—Lifting frames, e.g. for lifting vehicles; Platform lifts with platforms suspended from ropes, cables, or chains or screws and movable along pillars
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H2801/00—Application field
  • B65H2801/03—Image reproduction devices
  • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

• the present invention relates to a lifting apparatus as defined in the preamble of claim 1.
• a lifting apparatus with a raiseable and lowerable lifting frame is often used.
• the lifting frame can be provided with a conveyor system or e.g. a roller track, which serves as a carrier to move panels or panel stacks.
• lifting capacities of the order of e.g. 10000-20000 kg are needed.
• the lifting apparatus applied in the feed station employs a hydraulic drive that raises and lowers a lifting frame using chain transmission.
• Such a solution requires fairly complex and strong structures.
• the hydraulic system is susceptible to leaks that may cause damage to the panels being handled. Adjusting the hydraulic systems is difficult and usually requires the use of proportional or servo techniques, leading to complex systems involving difficulties e.g. in respect of maintenance.
• the object of the present invention is to achieve a new type of lifting apparatus that obviates the drawbacks of prior art.
• the apparatus of the invention has numerous significant advantages.
• the invention makes it possible to use a structural solution that is simpler than earlier solutions. Slots formed at the ends of lifting shafts permit easy and reliable attachment of lifting belts.
• the use of lifting belts allows a very compact structure.
• the drive system permits very accurate vertical positioning of the lifting frame, which can also be easily adjusted. Master and slave drives allow precise adjustment of several drive shafts even in a situation where the lifting frame has an uneven load.
• Fig. 1 presents a lifting apparatus according to the invention in side view
• Fig. 2 presents a lifting apparatus according to the invention in end view
• Fig. 3 presents a lifting apparatus according to the invention in top view
• Fig. 4 presents a detail of Fig. 1 as sectioned along line IV-IV,
• Fig. 5 presents the end of a drive shaft in the lifting apparatus of the invention as sectioned along an axial plane
• Fig. 6 presents the end of the drive shaft as sec- tioned along line VI-VI in Fig. 5.
• Lifting apparatus especially for stacking or unstacking stations on panel handling lines, said apparatus comprising a raiseable and lowerable lifting frame 1 and means for raising and lowering the lifting frame.
• the means for raising and lowering the lifting frame comprise at least one drive shaft 2, 3 and at least two lifting belts 4, 5, 6, 7, the first end of which is attached to the drive shaft 2, 3 while the second end is attached to the lifting frame 1 or arranged to pass via the lifting frame and attached to the frame structure of the lifting apparatus.
• the lifting apparatus comprises a frame which has a pillar 8 at each corner as well as longitudinal supporting beams 9 and transverse supporting beams 10.
• the drive shafts 2, 3 are disposed in the upper part of the frame in a transverse position between the pillars 8.
• the drive shafts 2, 3 are supported by bearings placed at a distance from the end of the shaft 2, 3 so that the end of each shaft remains free.
• the drive shafts 2, 3 are driven by a drive unit 11, preferably via a transmission 12.
• the drive unit preferably consists of a conventional combination of a cage induction motor 11 and a pin transmission 12.
• the lifting belts 4, 5, 6, 7 are placed on the free ends of the drive shafts 2, 3, so that, when the shafts 2, 3 are rotated, the belts are wound around the shafts, thus raising the lifting frame 1.
• the lifting belt 4, 5, 6, 7 is unwound from the shaft and the lifting frame 1 is lowered.
• the other end of the lifting belt is attached by means of fixing devices 13, 14, 15 to the lifting frame 1, or alternatively the lifting belt is arranged to pass via a diverting pulley or the like mounted on the lifting frame and attached by means of fixing devices to the frame of the lifting apparatus.
• “Lifting belt'” refers to a lifting strap with at least one loop formed in it. Usually the lifting belt has a loop at each end.
• the drive shaft 2, 3 is provided with a slot 16 or the like to permit a lifting belt 4 to be attached to the drive shaft (Fig. 5 and 6) .
• the slot 16 forms a cleft at the end of the drive shaft. In the axial direction of the shaft, the slot 16 extends through a distance at least corresponding to the width of the lifting belt 4.
• the loop at the end of the lifting belt 4 is placed on the shaft 2 so that part of the loop is in the slot 16.
• the edges of the slot are preferably rounded.
• the end of the drive shaft 2 is provided with a flange element 17 to prevent the lifting belt 4 from coming off the shaft 2 as it is wound up on the shaft.
• the flange element 17 has a diameter substantially larger than that of the shaft 2.
• the flange element comprises a counter element 18 designed to fit into the slot 16.
• the counter element 18 prevents the shaft end segments 2', 2 ' ' on opposite sides of the slot 16 from being pressed together.
• the shaft end is provided with a cen- tral mortise 19, in which case the counter element 18 of the flange 17 is a projection, sleeve or the like that fits into the mortise.
• a cut-out 20 that fits onto the shaft end so that the flange element can be firmly fixed to the end of the drive shaft 2 by means of fixing elements 21, such as screws.
• the flange element 17 keeps the shaft end segments 2', 2 ' ' and therefore the slot 16 in a straight position.
• the lifting apparatus has two drive shafts 2, 3, each with two lifting belts 4, 5, 6, 7 arranged to raise and lower the lifting frame 1.
• the lifting belts are arranged to raise the lifting frame 1 directly via fixing elements 13, 14, 15.
• a solution can be used in which the lifting belt 4, 5, 6, 7 passes around one or more diverting pulleys (not shown) .
• the drive shafts 2, 3 are driven by a drive unit 11 preferably provided with a frequency converter and a pulse sensor or equivalent. This allows a very accurate control of the drive shafts.
• one of the drive units is a so-called master drive while the others are so-called slave drives.
• the slave drives closely follow the master drive e.g. on the basis of readings obtained from the pulse sensor, with the result that the lifting frame 1 e.g. remains accurately in a straight position. This also makes it possible to avoid deviations of the lifting frame from the horizontal plane due to uneven load.
• the lifting capacity of the lifting apparatus of the invention is e.g. 10000 kg
• a " lifting belt of polyester textile material having a width of 100 mm and a thickness of 3.2 mm and a rated load of 4000 kg.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Geology (AREA)
• Structural Engineering (AREA)
• Delivering By Means Of Belts And Rollers (AREA)
• Sheets, Magazines, And Separation Thereof (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=8546808

Family Applications (1)

Country Status (4)

Families Citing this family (6)

Family Cites Families (4)

• 1996
  • 1996-10-04 FI FI963987A patent/FI101285B1/fi active
• 1997
  • 1997-10-01 CA CA002267215A patent/CA2267215A1/en not_active Abandoned
  • 1997-10-01 EP EP97942977A patent/EP1009707A1/de not_active Withdrawn
  • 1997-10-01 WO PCT/FI1997/000591 patent/WO1998015489A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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