Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
  • B27B25/00—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees
  • B27B25/02—Feeding devices for timber in saw mills or sawing machines; Feeding devices for trees with feed and pressure rollers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27C—PLANING, DRILLING, MILLING, TURNING OR UNIVERSAL MACHINES FOR WOOD OR SIMILAR MATERIAL
  • B27C5/00—Machines designed for producing special profiles or shaped work, e.g. by rotary cutters; Equipment therefor
  • B27C5/02—Machines with table
  • B27C5/06—Arrangements for clamping or feeding work
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
  • B27F1/00—Dovetailed work; Tenons; Making tongues or grooves; Groove- and- tongue jointed work; Finger- joints
  • B27F1/16—Making finger joints, i.e. joints having tapers in the opposite direction to those of dovetail joints

Definitions

• the invention relates to a workpiece clamping station according to the preamble of patent claim 1.
• wood is processed which is completely free of knots and other damaged areas.
• These woods are made from selected short and damage-free short woods. These generally have a length of 150-800 mm. These woods are sorted into packages with widths of up to 800 - 1000 mm and sorted and fed to a package finger jointing machine. The packages are aligned on the end face, tensioned and then provided with a wedge tooth profile by means of a horizontal milling cutter. Glue is then entered into this finger joint profile. These finger-jointed woods are then assembled into lamellae that are up to 6 mm long and pressed on the front.
• roller tables or conveyor belts are used for this purpose. Because of the very short lengths of wood that have to be processed, a small roller clearance is required for roller tables. In the case of package widths of 800-1000 mm, rolls with correspondingly small radii can no longer be used, since they have to absorb the clamping pressure when the package is clamped vertically and thereby bend. Rollers with small radii also do not ensure sufficient frictional engagement with the wood that is required to align the package at the face when it is inserted into the station.
• conveyor belts are used in the workpiece clamping station, which ensure good entrainment and thus frontal alignment and, when clean, form a good contact surface.
• Contamination such as wooden chisels on the support side and the running side of the belt, as well as the deformability of this belt, however, impair the angular accuracy when milling.
• the desired good friction in the conveying direction has an unfavorable effect when aligning and clamping in the lateral direction.
• the invention has for its object to provide such a workpiece clamping station.
• ⁇ o can be optimally selected for the transport of the package and for its frontal alignment in that the transport rollers have a friction lining.
• a relative adjustment takes place in such a way that the wood of the package rests on the upper edges of the support webs for lateral alignment and clamping.
• the upper edges of the support webs have a low coefficient of friction, so that the frictional resistance against lateral alignment is minimal.
• the invention provides a workpiece clamping station with which it is possible to meet opposite physical conditions, namely a high and a low frictional effect in succession at the same location.
• the transport rollers are advantageously driven by a common drive.
• one supporting web is arranged in front of a transport roller.
• a transport roller which can receive the package bumplessly when the package is fed.
• a bar is advantageously arranged, which increases the guide surface towards the milling cutter and thus the support surface during milling.
• the top edges are chamfered with advantage.
• the support webs are designed to be stationary and the transport rollers are mounted so that they can be raised and lowered.
• the axle ends of the transport rollers are advantageously connected to hydraulic or pneumatic pistons.
• the transport rollers are designed as solid rollers with stub axles supported on pneumatic cylinder pistons. In this embodiment, the transport rollers can be raised pneumatically and lowered again as a result of their weight by releasing the pressure.
• the vertical clamping device has a pressure plate which is mounted on two synchronously driven spindle pairs which are arranged at a distance from one another in the conveying direction. This assembly ensures that the Pressure plate aligned exactly parallel to the package.
• the pressure plate is particularly advantageously mounted on two cross bars, the ends of which are in drive connection with the spindles.
• the spindles are in turn connected to a central hydraulic motor, via whose hydraulic pressure the clamping force can be adjusted.
• the opening stroke of the pressure plate is controlled by a timer.
• the function of this timer is set according to the height of the package, so that the work cycle can be optimized.
• the width of the printing plate of the package width i.e. the width of the table formed by the transport rollers and support webs is adjusted so that the package can be optimally stretched in the width direction.
• the length of the pressure plate is expediently adapted to the length of the longest piece of wood to be processed.
• the maximum length of the printing plate is determined by the length of the table formed by the support webs and transport rollers. Mr ⁇ particularly advantageous, the length is dimensioned such that ends of individual longer woods are spanned.
• An elastic spring plate is advantageously mounted on the pressure side of the pressure plate, on the projecting one Spring elements are formed.
• These spring elements can be designed as parabolic spring elements, which are arranged in rows offset from one another in order to enable a tight resilient contact pressure on the top of the package.
• a side clamping plate for optimum side alignment and clamping, a side clamping plate, the length of which corresponds to the length of the table, is arranged on both sides of the table formed by the transport rollers and support webs.
• This configuration of the side clamping plate advantageously compresses the package over the entire length.
• These clamping plates can be pressed against the package in a hydraulically floating manner with particular advantage. The package no longer has to be shifted by the entire difference between package width and channel width, since the clamping plates are pressed against the package in a floating manner.
• These side clamping plates are particularly advantageously provided with cutouts in the stroke of the cross bars of the vertical clamping device, so that the vertical clamping device can carry out its work unhindered when the side clamping device is applied.
• 1 is a schematic exploded view of components of the workpiece clamping station
• FIG. 2 shows a schematic cross-sectional view of the workpiece clamping station shown in FIG. 1, FIG. with parts omitted.
• a workpiece clamping station 1 is shown in FIG. Coming from the right, workpiece packages are introduced into this workpiece clamping station 1 and these are provided with finger joints by a horizontal milling cutter. The center of the horizontal milling path is shown schematically at 4. In the illustration in FIG. 1, the horizontal milling cutter moves perpendicular to the plane of the drawing.
• Milled finger joints are shown schematically at 22 on a short piece of wood.
• a table 19 is provided in the workpiece clamping station 1.
• This table 19 has alternating transport rollers 2 and support webs 3.
• the alternating arrangement of these components is such that in the conveying direction towards the milling cutter 4 there is in each case a support web 3 in front of a transport roller 2.
• the support webs 3 are fixed in the machine frame and form a grate.
• the transport rollers 2 are designed as solid rollers, the ends of which bear stub axles 13. These stub axles 13 can be raised and lowered on a schematically shown hydraulic cylinder piston 14. With this pneumatic cylinder piston 14, the transport rollers 2 can be raised in such a way that their apex lines lie over the upper edges 6 of the support webs 3. As shown schematically in Figure 1, everyone is
• REPLACEMENT LEAF Provide the circumference of a transport roller 2 with a friction lining 5.
• a chain drive 24 for all transport rollers 2 is shown schematically.
• the chain 25 of this chain drive 24 runs over the chain wheels 25 shown in FIG. 2, which are mounted on the stub axles 13.
• the transport rollers 2 provided with the friction lining 5 extend over the plane of the upper edges 6 of the support webs 3, a package fed from the right can be transported by means of these rollers against a device (not shown) for the frontal alignment of the package.
• the transport rollers 2 are lowered in such a way that the package, not shown, is supported on the upper edges 6 of the support webs 3.
• These upper edges 6 are polished bright and form a minimal frictional resistance.
• the side clamping plates 27 shown in FIGS. 2 and 3 are only moved together in a floating manner and align the package which is supported on the support webs 3 laterally. After this lateral alignment has taken place, the vertical tension is carried out.
• the vertical clamping device has a substantially rectangular clamping plate 9.
• the width of this clamping plate 9 is dimensioned such that it extends essentially over the width of the table 19.
• the maximum length of this clamping plate 9 is determined by the length of the table 19.
• the length of the clamping plate 9 is particularly such
• REPLACEMENT LEAF measure that when clamped it can hit the longest wood in the package at both ends.
• two pairs of spindles 15, 16, which are spaced apart from one another and flank the table 19, are provided. These pairs of spindles 15, 16 are in drive connection with a central hydraulic motor and are driven synchronously by the latter.
• the clamping plate 9 of the vertical clamping device 8 is mounted on two parallel cross bars 10, the ends of which are in drive connection with a pair of spindles 15, 16 each.
• the fastening of the clamping plate 9 and the drive of the spindles 16 are such that the clamping plate 9 can be moved exactly parallel to the support surface of the table 19.
• An elastic spring plate 17 is arranged on the pressure side of the pressure plate 9. Spring elements 18 are formed on this elastic spring plate 17, which have in particular the shape of parabolic spring elements. These spring elements 18 are mounted on this spring plate 17 in rows with gaps. As shown, recesses 21 are provided in the side clamping plates 20, into which the cross bars 10 can enter when the vertical clamping device 8 is lowered. 5

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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Jigs For Machine Tools (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6395829

Family Applications (1)

Country Status (3)

Cited By (2)

Families Citing this family (3)

Citations (6)

Family Cites Families (2)

• 1989
  • 1989-12-15 DE DE3941976A patent/DE3941976A1/de active Granted
• 1990
  • 1990-12-14 EP EP91900160A patent/EP0505392B1/de not_active Expired - Lifetime
  • 1990-12-14 DE DE59006792T patent/DE59006792D1/de not_active Expired - Fee Related
  • 1990-12-14 WO PCT/DE1990/000977 patent/WO1991008876A1/de active IP Right Grant

Patent Citations (6)

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