Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27H—BENDING WOOD OR SIMILAR MATERIAL; COOPERAGE; MAKING WHEELS FROM WOOD OR SIMILAR MATERIAL
  • B27H1/00—Bending wood stock, e.g. boards

Definitions

• the invention relates to a device for rotating boards and. The like.
• a plurality of guide frames pivotally mounted in a rack about a common rack longitudinal axis with a pivot drive, which together form a board guide channel which extends along the rack longitudinal axis and has a twist about the rack longitudinal axis which is adjustable by means of the pivot drive of each guide frame.
• Boards and similar lamellar elongated wood products can be separated from the sides of a flattened timber or log using a non-cutting technique. These boards or similar wood products not only have a curvature but also a twist, ie they are rotated or coiled around their longitudinal axis. This deformation precludes automated further processing of the boards in numerous applications. The twist that occurs is stronger, the more inclined the cutting edges separating the board are from the longitudinal direction of the wood. With a known device of the type mentioned (DE-OS 37 01 127), the boards can be subjected to a direction-of-rotation process so that they lose their twist caused by manufacture and are therefore suitable for further processing.
• the guide frames are pivoted about a common axis, for example the longitudinal axis of the frame, in such a way that they together form a board guide channel, the twist of which is selected around the longitudinal axis in such a way that it reverses the existing twist of the boards.
• the guide frames in the known device are each provided with a separate swivel drive which brings them into the swivel position required in each case.
• the control of these individual rotary actuators is relatively complex.
• the object of the invention is therefore to provide a device for rotating boards and. Like. Form the type mentioned in such a way that the swivel drive required for the adjustment of the guide frame is significantly simplified.
• This object is achieved in that all the guide frames from a common pivot drive can be driven via one transmission gear each, and that the transmission ratios of the transmission gears increase in the direction of the board.
• the individual guide frames are driven via the transmission gears with different transmission ratios during the adjustment process so that the next guide frame is pivoted more than the previous one in the direction of board travel. This allows any desired swirl of the board guide channel to be set quickly and easily.
• each guide frame has an output toothing on its circumference with the same diameter and that a drive toothing is assigned to each guide frame on a common drive shaft, the diameter of which increases in the board running direction, and that each drive toothing with the associated output toothing over each a positive gear link is connected.
• the transmission gears can be designed as chain drives, toothed belt drives or gear drives.
• Fig. 1 in a simplified front view of a device for rotating boards u. the like,
• Fig. 2 shows a section along the line II-II in Fig. 1 and
• Fig. 3 in a eighth representation a longitudinal section through the board guide channel.
• each guide frame 2a..2f is pivotally mounted about a common axis 3 of the frame.
• each guide frame 2a..2f is supported with an outer ring surface on guide rollers 4 mounted in the frame 1.
• Each guide frame 2a..2f is designed as an open ring at a circumferential point and carries an upper board guide body 5 and a lower board guide body 6, the mutually facing surfaces 7 and 8 of which are curved in the longitudinal direction of the frame 1.
• the board guide bodies 5, 6 are designed as elongated rods and extend transversely to the longitudinal direction of the frame.
• the upper board guide body 5 of each guide frame is fixed therein arranged, while the lower board guide body 6 is pivotally mounted at one end in a pivot bearing 9 in the guide frame 2a..2f.
• the other end 10 of the lower board guide body 6 is attached to the guide frame so that it can be folded down.
• the respective lower board guide bodies 6 can be opened to make it possible to remove remaining wood or fragments from boards in the device. For this reason, the guide frames 2a..2f are each open at a peripheral point.
• All board guide bodies 5, 6 of the guide frames 2a - 2f arranged one behind the other form a common board guide channel 11, which extends along the longitudinal axis 3 of the frame, for the boards 12 to be straightened (FIG. 3).
• the boards 12 are preferably driven by drive rollers (not shown) arranged downstream of the frame 1.
• a common swivel drive 13, only schematically indicated in FIG. 2, serves for this purpose, for example a servomotor, which can be designed as a geared motor and drives a common drive shaft 14, which is located in the frame 1 is stored.
• a plurality of chain wheels 16a..16f each forming drive teeth 15a..15f are fastened one behind the other on the common drive shaft 14.
• Each drive toothing 15a..15f is each with a driven toothing 17a..17f on the circumference of the respectively assigned guide frame 2a..2f via a chain 18a..18f in a form-fitting drive connection.
• Guide frames 2a..2f thus form sprockets 19a..19f, all of which are of the same diameter.
• the drive gears 15a..15f are designed with an increasing diameter in the direction of board travel.
• the gear ratios increase from the gear mechanism 15a, 17a, 18a at the board inlet to the gear mechanism 15f, 17f, 18f at the end of the board guide channel.
• the transmission ratio is 1: 4 at the beginning of the board guide channel and 1: 2 at the end of the board guide channel.
• the transmission gears connecting the common drive shaft 14 to the individual guide frames .2a..2f are chain drives. Instead, it is also possible to use toothed belt drives.
• the drive teeth and the output teeth are designed as toothed belt pulleys.
• drive gears and the output gears are designed as spur gears and the connecting gear members as intermediate gears in engagement with them.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Gears, Cams (AREA)
• Transmission Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6394977

Family Applications (1)

Country Status (2)

Citations (2)

• 1989
  • 1989-12-07 DE DE19893940443 patent/DE3940443A1/de active Granted
• 1990
  • 1990-10-26 WO PCT/EP1990/001913 patent/WO1991008877A1/de unknown

Patent Citations (2)

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