FI59547B - FARING PROCESSING FOR FRAMSTAELLNING AV EN SKIKTPRODUKT - Google Patents

Description

R3FH M (tD ^ WULUTUSJULKAISO 59547 J§Ta m '1Ί' utläogningsskrift j 'CW TE tent ::: iiciEt ^ * (SI) K ».ik.3 / int.a.3 B 27 D 1/04 · ENGLISH FINLAND (*) »*« - «-« 509/73 20.02.73 vr, / (23) AthuplM — GIMgh «Mdag 20.02.73 (41) Tullut | uIMmM - iMvtt effantMg 02.12.73

PMMtti. and from the registry »n · * · **, ™ |. p ^ .- _ Q

Patent · och ragietarstyralMn '' Amaku uthgd od> utijitrMtm puMiond 29.05. oi '(3 ^ (13) (31) ^ yy4 «tty · μοΜμιμ- ^ · Μ arloriut 01.06.72 USA (US) 25Θ898 True Joist Corporation (71) Trus Joist Corporation, 9777 W. Chinden Blvd. Boise, Idaho 83702 , USA (72) Arthur L. Troutner, Boise, Idaho, John R. Russell, Boise, Idaho,

Alan W. Johnson, Boise, Idaho, Clifford Ray Johnson, Boise, Idaho, USA (US) (7 * 0 Leitzinger Oy (5 * 0 Method and apparatus for making a layered product -Förfarande och anordning för framötällning av en skiktprodukt

In the method which is the subject of the invention, the sheets of material are placed in a continuous, rectilinearly extending sheet stack, in which the ends of the sheets overlap with the ends of the sheets of the second layers. The device comprises a linear conveyor supporting the plate bundle to be formed and drive devices connected to the conveyor for moving it in a straight line in stepwise predetermined amounts. The plate bundle to be formed on the linear conveyor is fed to the press in the next pressure. The invention is particularly suitable for joining glue-coated wood veneers together into a continuous stack.

U.S. Patent No. 3,723,230 discloses a continuous press into which a batch of stacked, adhesive-coated thin wood panels or other sheets of material is continuously fed. In the press, this bundle of sheet metal is converted into a strong, uniform layered product, such as a beam or construction timber. However, it has been found that the nature and construction of the unconnected sheet stack fed to the press has a substantial and critical effect on the properties of the product joined together by the press.

i.

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Since the continuous feed fed to the press must necessarily comprise a multiple of sheets of wood veneer or other material, which must be assembled in one way or another, it follows that the finished product removed from the press will always have multiple joints at the contact point of two adjacent sheets. If the joints are too close to each other in the thickness direction of the product or too close in the longitudinal direction of the product, they will cause structurally weak levels or areas. Also, any irregularity between the joints in the longitudinal direction of the product causes corresponding irregularities in the strength properties of the product. These factors can significantly reduce the economic use of a product.

If the raw material is wood veneers, the difficulty is that they are brittle and break easily, especially in the direction of the causes and from areas of defective wood. This poses a difficult problem in stacking them into a continuous compression charge.

If the wood veneers are still commercial veneers made by the usual manufacturing method, their thickness will always vary. Width variations are due to many factors, including shear, breakage, and shrinkage in the dryer. Cutting veneers to a uniform width naturally causes considerable waste. On the other hand, the use of veneers of indeterminate width tends to provide a compression charge of non-uniform thickness at its longitudinal edges. This, in turn, makes it necessary to align the joined compression product to remove defective areas, resulting in raw material loss.

Another problem when assembling a continuous bite insert is that the boards used as a raw material, and in particular the plywood veneers, are corrugated and not planar. Thus, without proper compression, they are not planar when stacked on top of each other. The absolute result of this feature of the veneers is an unreasonably thick and unevenly assembled stack, from which the veneers tend to escape when the stacks are moved from one place to another, interfering with the conveyors, clogging the press openings and producing a substandard product *

A further obvious difficulty arises in depositing sheets of wood veneer or other material that are corrugated, uneven in width, and prone to breakage, on continuous substrates at a speed sufficient to provide economical production with a cooperating durable press.

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Accordingly, it is an object of the present invention to provide a method for assembling boards, in particular wood veneers, into a continuous, rectilinear stack which is substantially uniform in size and quality and which is suitable for feeding into a continuous press at an economically feasible speed.

To achieve this object, a method according to the invention is characterized in that a) a first plate stack is stacked on a linear conveyor so that the plates are progressively overlapped relative to each other by a predetermined amount in the direction of conveyor movement c) placing the first plate of the second plate on the linear conveyor so that its front end overlaps the rear end of the plate of the first plate already placed on the conveyor, d) moving the linear conveyor forward to the second base of the first bundle e) placing a second plate of the second plate bundle on top of the latter base plate of the first plate bundle placed on the first plate of the second bundle; f) repeating steps b), c), d) and e) until all the plates of the first plate are placed on a linear conveyor and also the second plate is constructed on it so that its plates progressively overlap at predetermined intervals with the plates of the first bundle, g ) raising the rear end of the second plate stack above the conveyor, and h) forming on the linear conveyor in the same way as in steps b) to g) my successive overlapping plates.puts sufficient to form a continuous layered product of the desired length.

Thus, the method according to the invention does not require at all the arrangement known from Finnish patent applications No. 138/72 and No. 416/69 for forming a sheet bundle from continuous vibri strips, which must be formed by smoothing the ends of the sheets and fitting and gluing the ends of the sheets together. . The omission of these 59547 measures means a substantial simplification and acceleration of the manufacturing process. The device structure is also simplified because no cutting devices for the ends of the individual veneers, devices for placing the ends exactly against each other and devices for gluing the individual veneers into continuous veneer strips are required at all.

Instead, the device according to the invention is characterized by disk placement devices for placing a first disk stack on a linear conveyor so that the disks progressively overlap with a predetermined amount relative to each other in the conveyor movement direction, devices for placing the lowest disk stack on the conveyor, and a disk stacking device. the front end overlaps with the back end of the first plate stack already placed on the conveyor.

An additional advantage of the invention compared to said known method and apparatus solutions is that the sheets used do not have to meet the same quality requirements as in the case where the sheets must be able to be joined together as individual sheet veneers before layering. In this case, production is possible with as little leveling of the plates as possible and thus with as little waste material as possible.

More specifically, the device according to the invention is characterized in that the plate placement devices for stacking plate bundles consist of reciprocating conveyors in their forward position above the feed end of the linear conveyor, and that the lower plate placement devices consist of gate devices that they adjust the gates between an open position in which they allow the reciprocating conveyor devices and the plate supported by them to travel as the reciprocating conveyor devices progress and a closed position in which the gate retains the rear end of the plate and sweeps the plate back and forth from the moving conveyor, whereby the plate comes into contact with the linear carrier with the plate already in it.

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Explanation of the drawings

Figures 1A and B show a top view of the device, respectively, with some parts cut away to improve clarity.

Figure 2 is a sectional view taken along line 2-2 of Figure 1A, illustrating the vertical support arms used in the device shown herein.

Fig. 3 shows a longitudinal section taken along line 3-3 of Fig. 2, illustrating a latch device for support arms.

Fig. 4 is a cross-sectional view taken along line 4-4 of Fig. 1B, illustrating an apparatus for operating support arms.

Figure 5 shows a horizontal section partly taken along line 5-5 of Figure 4.

Fig. 5 shows a cross-section partly taken along line 6-6 of Fig. 1A, illustrating a straightening device for straightening a plate to be treated with a device according to the invention.

Fig. 7 shows a partial section taken along line 7-7 of Fig. 1A, further illustrating a device for straightening plates *

Fig. 8 shows a cross-section partly taken along line 8-8 of Fig. 1B, illustrating an apparatus for retaining layers of sheets to be treated with a device according to the invention.

Fig. 9 is a partial cross-sectional view taken along line 9-9 of Fig. 1B, illustrating a stack holding device.

Fig. 10 is a schematic side view, in Fig. 1A, taken along line 10-10 in the direction of the arrows, of a drive for a reciprocating conveyor used in the above device.

Fig. 11A is a schematic side view of the layering structure of a stack of a plate to be assembled with the device shown, with reciprocating conveyors and guide arms in the rear position.

Fig. 11B shows a continuation of Fig. 1A with the reciprocating conveyors advancing.

Figure 12 is a semi-schematic side view of a portion of the overlapping structure of the veneer stack after assembly prior to compression molding.

Fig. 13 shows in the same way as Fig. 12, but about four times larger in size after the joint joining the stack.

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Fig. 14 shows an abbreviated cross-section taken along line 14-14 of Fig. 13.

Fig. 15 shows, in the same way as Fig. 13, a pressed stack using plates with bevelled ends for the method according to the invention, and Fig. 16 schematically and perspectively shows a device according to the invention, illustrating the arrangement of its main components.

Description of a particular embodiment of the invention; A · Raw material

As indicated above, the device just described can be used to arrange various sheet materials in a linear layer. Thus, it can be used for the production of layered products of sheets made of minerals, fibreboard and various plastics. However, it is very useful in joining glued-coated wood panels, especially plywood veneer, and in the manufacture of beams as well as construction timber.

According to an economic embodiment, the device assembles continuous, glued, layered, beams or planks of indefinite length, three or four feet wide and two to four inches thick. Such a beam can be sawn lengthwise in the manufacture of beams, planks, grooves or other structural members having high strength and uniformity.

Plywood veneers, which are a preferred raw material for the purposes of this invention, include technically made veneers commonly used in the manufacture of plywood. Such veneers are uniform in length, slightly larger than eight feet, uneven in width, and substantially uniform in thickness, about 1/8 ". However, different veneer thicknesses can be used, allowing the barn & pattern to be varied as appropriate. Veneers are sorted by width or cut The veneers are then coated with an adhesive by any conventional technique, such as spraying, spraying, brushing or roller coating, in which case sufficient adhesive is used to fill the cavities and cover the surfaces.The adhesives may be hot or cold curable.

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The glue-coated veneers are then loaded into the above-mentioned device comprising six sub-devices, namely a reciprocating conveyor feeding the veneers, a veneer straightening device which aligns the veneers on a reciprocating conveyor, a horizontally guiding frame device and a horizontal guiding device removal, a vertically guided support arm device that supports the veneers in interlaced order prior to stacking, a retainer device that retains the pin-covered continuous veneer bench, and a straight conveyor that supports the continuous stack for the next step, e.g., a continuous press.

The following detailed description refers to the drawings and explains the structure of the sub-devices and their mode of operation separately and in conjunction with other sub-devices.

B. Reciprocating conveyor

In order to increase the production volume and to obtain the final assembly of the desired connecting structure, two or more reciprocating conveyors are preferably used in the present device. They work to straighten and feed the plates one at a time to form an overlapping, continuous, uniform stack, which is the product provided by the device. In the soon-to-be-illustrated embodiment of the invention, there are two such reciprocating conveyors.

A reciprocating conveyor, indicated by the general reference number 10, together with other sub-devices of the device according to the invention, is mounted on a frame 12, which in turn is supported by legs 14. The frame includes upper and lower structural members 16 and 18 supported by posts 20 and supported by cross members 22.

In the illustrated embodiment, upper and lower split rails 24, 26 are used to support the two reciprocating conveyors. These are removably mounted on the surface of the horizontal frame members, respectively, via mounting pieces 28: Preformed supports 30 integral with the rails 24 and 26 are attached to the rails 24 and 26. 32.

The upper and lower reciprocating conveyor devices are denoted by reference numerals 34 and 36, respectively. Each conveyor comprises a washer 38. These support a plurality of mounting members 40 spaced at a longitudinal side edge 59547 on which wheels 42 are rotatably mounted at an angle to each other. , 26 along. When the reciprocating conveyor is used to move plywood veneers, there may be six mounting pieces 40, each of which is mounted with six wheels 42.

The washer 38 of each reciprocating conveyor has spaced apart ribs or plates 44 extending the entire length of the washer, Figure 1A. The plates are separated by grooves which are functionally important in removing the veneer or plate from the conveyor, as will be seen below. The vertical guide 45, which also acts as a stop, extends upwards along the longitudinal side edge of the washer. Extending upwardly from the rear upper surface of the plates 44 are pusher projections 46. These engage the rear edge of each sheet or plate and assist in its forward transport.

Suitable devices are provided for rectifying each reciprocating conveyor 34 and 36. In the illustrated embodiment of the invention, the drive device comprises fluid-operated cylinders, in particular air cylinders 48 and 50, with their associated ropes (Figures 1A, 2 and 10).

Each of the conveyors 34 and 36 has a holder 52 which is integral with them, to which the rope 54 resp. 56 is attached. The ropes pass around rope pulleys 58 rotatably mounted on supports 60 attached to cylinders 48, 50. From rope pulleys 58, ropes pass through a barrier wall 62 with which the cylinder is provided at the rear end of the cylinder piston 64.

The cylinders 48, 50 are supplied with compressed air through a line 66. A shock absorber is connected to each cylinder, which absorbs the shocks caused by the repeated changes in the direction of the reciprocating conveyor. Finally, the cylinders are fixed to the plates 68, 70, respectively. The latter are again supported by horizontal frame members 16, 18.

Buffer arms 72 and 74 project outward from the right rear corners of the conveyors or carriages 34, 36. At the limits of the trajectory of the carriages, the arms 72, 74 contact the shock absorbers 76, 78 mounted on the plates 68.

Special devices are provided for placing the sheets or sheets directly in a row and for maintaining them as they pass through the apparatus.

9 5954? For this purpose, according to Figures 1, 2 and 6, spaced apart «parallel guide fences 80» are provided, which are supported by the posts 82 and the supports 84 along the length of the device.

A horizontal sheet straightening device, also indicated by the general reference numeral 86 in Figures 1A and 6, is also connected to each conveyor.

Each horizontal straightening device includes a lever arm 88 having a rectangular base 90. This is articulated via a shackle bolt 92 threaded into the washer 38. The pivotally mounted lever arm spring presses against the plate in the direction of travel supported by the spring 94 reciprocating. This is articulated by means of a pivot pin 96 to the rectangular base 90 of the lever arm. The pivot pin passes through a plate 98 which is integral with the washer 38 and which installs the tension spring 100 in place.

The tension spring 100 rests on one end against the plate 98 and on the other end against the tension adjusting locknut 102. A roller 104 is mounted on the rear outer corner of the rectangular base 90. In the rear position of the carriage, the roller rests against the inclined guide cam 106. This is bolted to the brackets 110 on the horizontal frame members 16, 18.

With the reciprocating conveyor in the advancing position, the spring 100 forces the lever 88 into forward contact with the side edge of the plate on the conveyor. This movement of the lever is interrupted by the controller 45.

In its forward position, the lever 88 rests against the side edge of the plate on the reciprocating conveyor, forcing the plate against the opposite side wall of the carriage, thereby aligning the plate. During the reversing movement of the conveyor, the roller at the base 90 of the lever contacts the inclined guide cam, which moves the lever arm to the retracted position, whereby a new plate can be placed on the reciprocating conveyor.

C, Control port device

The plate placed on the above reciprocating conveyor is further straightened, transported and removed from the conveyor by a control port device indicated by the general reference number 112 and illustrated in Figures 1A, 6 and 7.

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The gate device is supported by two grooved, vertical columns, which columns are located inside the frame members 16, 18 and are integral with them. Attached to the upper and lower ends of the columns by bolts 120 are two fluid-operated cylinders on top of them, preferably air cylinders 116, 118 «

The cylinder pistons 122 are secured by pins 124 to the outer ends 126 of the upper gate member 120 and to the outer ends 130 of the lower gate member 132. The outer ends 126 and 130 of the gate members terminate in grooves 134 made in the inner surfaces 136 of the posts 114.

The central portions 138 of the gate members operate between the guide fences 80. Their lower edges are notched to form continuous, downwardly extending short sticks or fingers 140 spaced apart from the raised plates 44 of the reciprocating conveyor washers 38. Along between the washer grooves 47 and the short pins 140, there are slightly longer pins or fingers 142. These extend into the grooves 47 when the gate members 138, 142 are lowered. In the fully lowered position of the gate members, the short rods 140 are just spaced from the top surface of the longitudinal plates 44.

It should be reiterated that when the sheets carried by the reciprocating conveyor are plywood veneers, there is a handling problem because the veneers tend to be non-planar, i.e. corrugated. »Thus, the device is equipped with a plate guide and stop device for guiding and restraining the front ends of the plates. Such a device is shown in particular in Figure 7.

Mounted on the upper front edge of the reciprocating conveyors 34, 36 is a finger plate 146 via screws 148 which pass through the spacers 150 and are threaded into the threaded holes in the washer 38. The spaces between the fingers of the plate 146 alternate with the pins 140 of the notched gate member so that these vertical pins extend downward.

A transverse guide 156 is located slightly in front of and above each of the finger plates 146. The outer ends thereof are mounted on the grooved posts 114 by means of arms 158 and bolts 160, the latter twisted into the posts.

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When the gate device operates, the front ends of the irregular plate fitted to the reciprocating conveyor are guided under the finger plate 146 by means of the corner surface of the guide 156. As the cylinders 116 operate, the gate rises, allowing the conveyor and the plate on top of it to pass under the gate. At the end of the advancement of the conveyor, the gate lowers and the conveyor retracts. The long pins of the notched gate member grip the rear edge of the plate, removing the plate from the conveyor.

D. Vertically steered support arm device

As described above, the plate removed from the conveyor is received by four cooperating support arms guiding a pair of vertically and straight guides at a horizontal distance. The support arm devices included in the device comprise a plurality of vertically guiding shelves, in the present case three, for receiving, packing and moving the plates along the assembly line in a manner that assembles them into a complete plate structure with the desired continuity and Limira structure. The structure and operation of this unit of the above device are illustrated in Figures 1A, 1B and 4.

All the support arm devices, indicated by the general reference number 162, are tied together so that they can be guided together upwards by a device comprising two pairs of upper and lower steps 164, 166 mounted on bearings 168 attached to the frame members 16, 18. to the lower shafts 164, 166 are mounted sprockets 170 which support endless chains 172.

According to Figure 2, the outer joints 174 of each chain 172 extend outwardly and are bent at opposite right angles to form lugs 176. These are mounted on the pieces 178 in threaded holes 182 via threaded bolts 180. The sides of each piece have four rollers 184 operating in slots 186. The latter are made on the inner surfaces of the vertical guides 188, which guides are bolted 190 to the inside of the frame 16, 18. The length of the guides is sufficient to grip three pieces 1J8 simultaneously.

A hole 192 is made in the center of each body 178 into which the inner end of the guide arm 194 is screwed. The latter is provided with three friction-reducing rollers 196 spaced apart along the length of its inwardly directed portion 198.

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To facilitate the control of the support arms, a latch device 202, Fig. 2, is arranged in connection with each control arm device. This device is mounted on the bottom of the frame 16 along the center line of the chain 172 via bolts 200. The latch device includes a body 20 * + and two integral protrusions 206. A horizontal bore 207 is slidably formed in the body 2OH, the latch pin 208 of which is slidably fitted. At its operating end 210 there is a beveled portion 209 which is freely accessible from the inner joints 17 + between inner surfaces. The drive end 210 of the pin terminates in a sloping surface 212.

The wedge body 20 * + has a wedge groove 21 * +. A wedge 215 is slidably fitted to this, which is attached to the latch pin 208 in the usual way »

The latch pin 208 has a wider end 216 that cooperates with the wider bore 217. A compression spring 220 is fitted between the wider end 216 and the cover 218 secured by screws 219, forcing the wider end of the latch pin against the shoulder 222.

When the latch device operates, when the rollers 175 of its joints touch the inclined surface 212 of the latch pin 208 as the chain 172 rises, the latch pin is depressed, releasing the rollers 175. However, when the control device retracts, the latch pin effectively locks the chain in place. The drive arm control device is shown in Figures H and 5.

A transverse steering mechanism, designated by the general reference numeral 22 * +, is arranged between the rearmost arm devices 162. Mounted on the centerline is a drive cylinder 226 articulated via a unitary intermediate shaft 228 mounted on a mounting piece 230 attached to the transverse auxiliary frame 232. The bolts 23 * + pass through holes 236 in the auxiliary frame and are threaded into the threaded holes 238 in the mounting piece 230.

The upper end of the cylinder piston 2 * + 0 is attached to a transverse U-shaped frame 2 * + 2. Two racks 2 * + * + are fastened with bolts 2 * + 8 to the vertical part 2 * + 6 of the frame 2 * + 2. The bolts 2 * + 8 run into the holes in the vertical members 2 * + 6 and are threaded into the threaded holes 252- made in the toothed rods 2 * + * +

The racks 2 * + * + are slidably disposed between two spaced vertical corner frames 25 * + attached from the bottom to the additional frame 232 and from the tops to the frame 18. The inner surfaces 256 of the corner frames 13 59547 254 are provided with additional guides for the vertical portions 246 of the frame 232.

Shafts 258 are rotatably mounted on shafts 166 and are aligned with racks 244. Secure friction clutches 260 are attached to the shafts 258 by means of wedges 262, which are connected to the gears 258.

Thus, when it is desired to guide the support arm devices upward, the cylinder 226 is actuated. Both shafts 166 are driven by a rack and pinion, which lifts all support arm devices up one step via chains and sprockets. The arms are held in their new position by the action of the latch device 202. The piston of the cylinder 226 is then retracted, causing the racks 244 to return. During the return movement, the gears 258 act as freewheels due to the action of the safety friction switches 260 connected to them. The drive is then ready for the next steering stroke, E. Disc Retainer

To restrain the stacks stacked from the plates on the arms, devices are provided which operate under the influence of reciprocating conveyors, as shown in Figures 1B and 8.

The retaining device 264 is attached to the frames 12 via angle irons 266 attached by bolts 268. Each retaining device 264 comprises side walls 270 spaced apart and secured to the upper and lower plates 272, 274 by bolts 276.

Mounted on the L-shaped carriage frame, indicated by the general reference numeral 277, are two inwardly extending retaining rods 278 supported by a vertical portion 280 of the frame.

The drive cylinder 282 is pivotally mounted via shaft pins 284 to two lugs 286 in the side walls 270. The cylinder piston rod 288 is connected by a pin 290 to protrusions 292 in portion 294 of frame 277. Two pairs of rollers 296 are attached to sides 280 and 294 of frame 277. The rollers protrude into the upper and lower rails 298 and 300, respectively. In addition, two pairs of rollers 302 are attached to the upper and lower surfaces of the portions 294 and project slightly outside the portion 294, contacting the inner surfaces 30tt of the walls 270. Thus, 14,59547 provides transverse control of the frame 277.

As the piston rod 280 protrudes, the rods 278 are fully retracted into the housing 306 formed by the sidewalls 270 and the plates 272 and 274. As the piston rod 280 is retracted, the rollers 296 extend along the respective inclined portions 308, 310 of the rails 298 and 300. This moves the rods 278 in and down until the frame 277 contacts the abutment 312 connected to the walls 270. Then, as shown in Figure 8, the upper retaining rods 278 contact and retain the upper arms of the plate stack, while the lower retaining rods 278 contact and retain the lower arm group of the plate stack. .

In conjunction with the rod device 264, a retaining roller device, indicated by the general reference numeral 314, is illustrated in particular in Fig. 9.

An inverted U-shaped frame 316 is bolted to the inner surface of the frame 18. It is further secured to the cross frame 232 by bolts 320. The drive cylinder 322 is secured to the frame 316 by bolts 324. The cylinder piston rod 326 is secured by a pin 330 to an inverted U-shaped movable frame. 328 in the middle. The downwardly directed projections 332 of the frame 328 support two pairs of outwardly directed rollers 334. These operate on vertical guide rails 336 made in the downwardly extending arms 340 of the frame 316. In addition, two rollers 342 are located on the sides and lower portions of the lower projections 332. 332 surfaces 344 outside. They are in contact with the inner surfaces 338 of the branches 340.

The rollers 334, 342 form a frame 328 of the control device for vertical movement. The transverse shaft 346 is secured at each end to the frame projections 332 by pins 348. The rotatably mounted retaining wheels 350 are mounted at regular intervals on the shaft 346, as shown in Figures 1B and 9. Immediately below the wheels 350 is a support roller 352 lowered at both ends of the frame 332.

F. Straight conveyor device

The sheets stacked on the support arm device 162 and fed from the vertical support arm devices are layered in an overlapping order on a rectilinear conveyor system illustrated in Figures 1 and 11. This conveyor system transports a continuous array of interleaved and stacked sheets for further processing, e.g.

The conveyor system includes periodic groups of conveyors 354. These are aligned with each other, in the same plane, and positioned with the upper working areas slightly above the level of the lower working arms of the support arm devices, as shown in Figure 11B.

All conveyors are connected together and used in step. When the sintered sheets are plywood, continuously fed to the press 356, the conveyors 354 can be advantageously locked to the actuator of the continuous press, thereby ensuring that their movement is properly timed with the loading movement through the press. In this connection, it should be noted that in one embodiment of the invention, continuously stacked veneers can be transferred to the press by an actuator that eliminates the need for transmission force in conveyors 354. However, in the illustrated embodiment, all conveyors are driven by a press drive 356.

The transverse rollers 362 are positioned on the same centerline as the conveyors and provide additional support. Both conveyors and rollers receive final support in the frame members 364.

G. Operation

The design and programming of the above device must take into account the size of the plates and in particular their thickness. Generally, the device is designed to provide an overlap of seven, preferably ten times the thickness of the plates. Otherwise, a weaker line will appear in the product along the adhesive seams. Also, especially when the layered product is the thickness of several sheets, it is advantageous to design a device with two or more reciprocating conveyors 34, 36 which layer two or more sheets simultaneously and correspondingly increase the straight distance between the adhesive seams.

The stroke length of the reciprocating conveyors is proportional to the length of the plates. To achieve a uniform result, the length of the plates should be 16,59547 even and divisible by the stroke length of the conveyor.

Conveyors 3 * 1 »36 reciprocating at the beginning of operation are canceled! the adjustment lever device 86 is retracted! the gate devices 112 are closed and the vertically guided support arm devices 162 are in place to provide three horizontal sets of aligned arms. These actually form three horizontal shelves on which the boards can be stacked overlapping. The restraining devices are moved forward and the clamp 356 operates continuously. Straight conveyors 354 · operate synchronously forward at the same speed as the press drive moves workpieces through the press.

When starting, the machine operator has two options. According to the other, he can manually overlap and stack the starter plates, feeding them into the press and building a bet on the conveyors as well as the support arms! which is double the work of it (performed by reciprocating and straight conveyors. This eliminates the ordering of the ends of the part to be pressed.

Alternatively, the machine operator can start the device according to the invention and allow it to run normally. This will finally assemble the compression cartridge to the final thickness. However, this method requires aligning the front end of the plate bench over several feet in length.

The progressive assembly of a continuous stack or layer is illustrated in Figures 11A and 11B.

When interpreting Figures 11A and 11B, one must keep in mind! that these patterns are schematic. Specifically, the plates are shown as parallel straight lines to improve clarity. In reality! due to the weight and flexibility of the plates! especially in the case of plywood veneers! they corrugate immediately downwards from their support surfaces. The support surfaces may be a series of support arms of the devices 162 or one or more straight conveyors 35M or rollers 362. In the illustrated embodiment, the plates are assembled into two separate stacks with two separate reciprocating conveyors. The plates are shown as follows in the drawings! but keep in mind! that at the outlet end of the device these two stacks merge into one stack t which is then fed to the press 356.

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Operation At the beginning of the cycle, the state of the stack is substantially as shown in Figure 11B, with minor modifications) which are explained in more detail below. The first stack formed by the plates V is on top of the upper layer of the support arms. The second stack of veneers V ’is on top of the intermediate support arms.

The reciprocating conveyor 34 is adapted to pass between the upper and intermediate layers of the support arms below the stack of veneers V. The reciprocating conveyor 36 is adapted to pass between the layer between the support arms and the lower layer below the stack of veneers V. Conveyors 35 * 4- are located below the reciprocating conveyor 36. The level of the conveyors is slightly above the level of the lower layer of the support arms) so that these support arms do not work.

Now, for example, the sheets of plywood are guided to a reciprocating conveyor 34. In this case, the conveyor is in the position shown by the dotted lines in Fig. 1A. Gate device 112 is in a closed position.

In the next step of operation, the gate is raised and the reciprocating conveyor 34 moves forward) until the rear end of the plate is on the other side of the vertical plane of the gate. During this advance movement, the plate is laterally aligned by the straightening device 86 comprising the straightening lever 88, and the continuity of the plate backwards over the rear end of the conveyor is prevented by the push plate 46 on it.

When the upper conveyor is fully advanced, the lower conveyor 36 is loaded and moves completely forward in the same manner.

As both conveyors move fully forward, the connected gates are lowered and the conveyors are simultaneously pulled back. During reversing the conveyors, the rear ends of the plates touch the front surfaces of the gates) sweeping the plates under the stacks of the overlapping plates.

The linear conveyors 354 are then started by connecting them to the actuator of the press 356. This displaces the stacks by a predetermined amount sufficient to cause the bottom plate of each stack to fall off the support arm that is furthest in the direction of travel and over the flammable plate below, while the ends of the plates overlap exactly the desired amount determined by gate position and plate length.

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If a final stack of thirteen sheets is required to provide a veneer beam or sheet bundle of the desired thickness, the above steps are repeated six times. This layers the twelve plates into overlapping stacks. The plates of the upper stack are denoted by the letter V in Figures 11A and 11B, while the plates of the lower stack are denoted by V: 11a. Thereafter, the successively layered plates of each stack are denoted by successive numbers 1, 2, 3, 4, 5, and 6.

After the twelve plates have been deposited in this way, the vertically moving support arm devices are guided upwards in one step, as shown by the arrows in Fig. 11A. This puts the pins in the position shown in Figure 11B.

If the perfectly assembled stack contains even plates, the above step is repeated as described. However, if it is necessary to pass an odd number of plates, in the example shown a thirteenth plate, this is achieved by passing an additional plate numbered 7 between the pins formed by the plates V and V as shown in Fig. 11B. The seventh plate is fed to the upper reciprocating conveyor 34, with the lower reciprocating conveyor remaining empty.

The above step is then repeated. The upper reciprocating conveyor operates in the space between the stacks formed by the plates V and V ', while the lower conveyor operates in the space between the lower stack formed by the plates V and the conveyor 354. They layer the following sets of plates one at a time simultaneously on the corresponding surfaces below. Thereafter, as the conveyors move one step at a time, the lowest plates of the overlapping stacks fall down on top of the newly layered plates, overlapping by the desired amount.

When done in this way, similarly located boards will always overlap previously previously layered boards. Thus, plate V-1 will overlap with previously layered plate V-1 and plate V-7 will overlap with previously layered plate V-7, and so on.

If the plywood veneers in the form of sheets have to be joined into a continuous laminated beam or sheet bundle, they are first coated with a suitable plywood adhesive. However, the top plate V-6 is left without this treatment, but a transverse adhesive strip is applied to its upper surface to provide an adhesive coating surface.

When the two stacks formed by the veneers V and V * leave the device, the upper stack falls downwards and merges with the lower stack into a single, thirteen-plate stack which is fed to the press. The structure of the product described above is illustrated in Figures 12-15.

Figure 12 shows a typical pink structure of thirteen plates. In fact, this combined stack 366 is assembled from a number of thirteen layers of plates, each with the plates not aligned in a rectilinear direction, but with the ends of adjacent layers spaced apart and interleaved in a predetermined number.

This provides a uniform pattern of overlap joints spaced apart in the best way to provide a uniform product with the highest possible strength.

Figures 13 and 14 illustrate the stack into one piece after assembly. It should be noted that the combined body 368 is of a certain length and its width is determined by the width of the individual plates. If the private plates are of different widths, the other side of the beam or piece will be flat due to the directional effect of the laterally directing device 86. This is advantageous because only the alignment of the second longitudinal side of the body is required to obtain a final product of uniform thickness across its entire width. In addition, a uniform thickness of the piece is obtained by pressing the overlapped plates in the press to a uniform thickness. As shown in Figure 13, in the case of wood veneers, this requires some crushing and compression of the wood fibers in the areas of the joint joints. The cavities in these areas are filled with the adhesive with which the sheets are coated. The formation of weaker points, such as gaps, is avoided by maintaining the gaps between the overlap joints in both the transverse and longitudinal directions, which gaps are preferably flat. This guarantees even properties and even strength of the products. If even greater strength is required, it can be provided by instincting the ends of the sheets and providing oblique butt joints rather than overlap joints, as shown in the veneer beam or sheet bundle of Figure 15.

Claims (6)

20 59547 A method of making a laminated product, comprising placing material sheets in a continuous, rectilinear, extending sheet stack, the ends of the sheets overlapping the ends of the sheets in the second layers, characterized in that a) a first sheet stack (V) is stacked on a linear conveyor (354) such that the plates are progressively overlapping each other by a predetermined amount in the direction of movement of the conveyor with the base plate of the bundle at the front and said front of the base plate resting on the linear conveyor (354); (V) a first plate for the linear conveyor so that its front end overlaps with the rear end of the plate of the first plate bundle already placed on the conveyor; e) placing a second plate of the second bundle on top of the latter base plate of the first bundle placed on top of the first plate of the second bundle, f) repeating steps b), c), d) and e) until all the plates of the first bundle are placed on a linear conveyor (354) and the second plate bundle is also constructed thereon so that its plates progressively overlap at predetermined intervals with the plates of the first bundle, g) raising the rear end of the second plate bundle above the conveyor, and h) forming on the linear conveyor in the same manner as in steps b) to g ) successive overlapping bundles of plates sufficient to form a continuous laminated product of the desired length. A method according to claim 1, characterized in that the lowest plate of the plate stack is placed on the conveyor by gravity simultaneously with the advancement of the conveyor. Apparatus for applying the method of claim 1, the apparatus comprising a linear conveyor (354) supporting the disc bundle to be formed and drive means (48, 50) connected to the conveyor 21 59547 for moving it linearly in increments of a predetermined amount, characterized by disc placement devices (34,36), for placing the first plate stack on the linear conveyor (354) so that the plates progressively overlap with each other in a predetermined direction of movement of the conveyor, means (112) for positioning the lowest plate the front end overlaps with the back end of the plate of the first plate bundle already placed on the conveyor. Device according to claim 3, characterized in that the plate positioning devices for stacking plate bundles consist of reciprocating conveyors (34, 36) in their forward position above the feed end of the linear conveyor (354), and in that the lowest plate positioning devices (112) consist of gate devices are located above the reciprocating plate placement devices (34, 36), and the gate actuators (116, 118) connected to the gate devices (112) so as to adjust the gates to an open position where they allow the reciprocating conveyor devices (34, 36) ) and the plate supported by them to reciprocate as the moving conveyors progress, and between the closed position where the port (138) retains the rear end of the disc and sweeps the disc away from the reciprocating conveyor (34, 36) as it returns to the linear conveyor. with the existing disc. Device according to claim 4, characterized in that the gate devices (112) comprise a horizontal bar (138) forming the gate, arranged transversely across the path of the reciprocating conveyor (34, 36), a plurality of longitudinally spaced fingers (140), extending downwardly from the rod and a reciprocating actuator (116, 113) coupled to the rod to move it between the raised and lowered positions. Device according to claim 5, characterized in that the reciprocating conveyor (34, 36) comprises a trough (146) at the bottom of which a plurality of transversely spaced longitudinal ribs (154) are provided to provide grooves therebetween. to receive the fingers (140) of the gate 22 59547 (112) during the return movement of the reciprocating conveyor (34, 36), wherein the reciprocating actuators include cylinders driven by a pressure medium connected to the rod (138).