Method for joining veneer strips

Abstract

434,252. Joining veneers. HERR, F., 15, Lubeckerstrasse, and ROVER, H., 7, Weide, both in L³neburg, Germany. Nov. 27, 1934, No. 34111. [Class 145 (ii)] [See also Group XXIX] In joining strips of veneer, leather, and like material transversely to the grain of the strips, the strips prepared on their transverse edges for glueing are assembled manually and clamped together and are then run into a press where glueing is effected while the veneers are stationary. The apparatus comprises a press table e, Fig. 3, operated by a piston b working in a cylinder a, the table carrying a heatable press plate c ; a heatable counter plate d is provided. The table e slides on uprights f, on which is mounted a frame comprising rails h on which runs a carriage i. One veneer m, Fig. 4, is placed on a beam n with its edge above a table o, and is clamped by a beam u actuated by a hand rotated cam through a lever s. The other veneer w is similarly clamped on a beam n<1> by a beam l actuated by a lever y. The edges of the veneers, which may be scarfed, are painted with glue or a glue film may be interposed. The carriage is then run into the press; a lever 3 is oscillated by a roller 2 on its lower end and engaging a stationary abutment 4, disengaging a pawl 5 so that the table o falls downwards about its pivot 6. When the press table e is raised the carriage i is lifted against the upper press plate d. On releasing a locking hook 8 the beams n, u can be swung out; this may be effected by springs, the unlocking being effected automatically during the raising of the carriage. The table o is reset on moving out of the press by a roller 10 on a lever 7 engaging a cam surface 11. The table o may be omitted if the veneers are relatively thick; the clamping of the veneers is then effected on opposite sides of the press. The press plates, Fig. 7, may be provided with undulated sheet steel plates 13 to prevent adhesion of the material thereto.

Description

[0001] Method for joining veneer strips The invention relates to a method and a machine for joining veneer, Strips of leather, linoleum, or similar materials, cut across their grain.

[0002] The production of uniform veneer strips with longitudinally running fibers is already known. For this purpose, the following are carried out on the The veneer strips, joined at their transverse edges and prepared for gluing, are placed next to each other within pressing devices, and then the latter... The joint was closed and the process continued together with the veneer strips until the glue had set. A disadvantage of this method is the position of the veneer strips. It is difficult to check because the work sites are unclear.

[0003] In contrast, the invention consists in the fact that the previously scarfed and glued parts are attached to the transverse edges in a known manner. prepared veneer strips are placed by hand next to each other on a carriage or sled of a press outside the gluing point and They are clamped in place and then inserted into the press. This makes the process of arranging and clamping them together more transparent than before. be carried out.

[0004] The method and suitable devices for carrying it out will be explained in more detail with reference to the drawing. Fig. i shows a Longitudinal section, Fig. 2 a top view and Fig. 3 a front view of a hydraulic scarf press, Fig. q the veneer clamping device in enlarged view Scales, Fig. 5 a special clamping scheme for the veneers, Fig. 6 a special design of the clamping beams.

[0005] A piston b is guided in a cylinder a, which carries the press table e and the heated press plate c. A similarly heated component is connected to d. The abutment is designated. The press table e is guided on columns f. A chassis is guided on the same columns by means of the bearing eyes g, which is in It essentially consists of two rails h. A carriage can slide along these rails. Weights k ensure the equilibrium position of the carriage. chassis.

[0006] At the beginning of the work process, a veneer nt previously joined on a special machine is placed on a beam ii in such a way that the The cranial fissure comes to lie in the middle of a table o. By half a turn of the crank p, the eccentric q is rotated so that the one at Y rotatable lever s at i swings downwards, whereby the tensioning beam u is lowered by the spring v onto the veneer tn and this is held between the beams u, jt is clamped. The next veneer w is then pulled forward and joined to the veneer m using sight and touch. The butt joint It was previously coated with glue or prepared for gluing by applying a film of glue. Then the eccentric x is rotated, whereby under mediation of Lever y and spring z lower the beam i onto the veneer n, and the beam n' is lowered. Now the carriage i is moved into the press, whereby the Roll 2' d,es;;.: lever 3 abuts a stop 4. .Daf@=.,:? thereby the lever 3 is slightly twisted and the pawl 5 is released, so that the The rotatably mounted table (o) tilts downwards in '66 together with the locking pawl 5 and a lever 7. If the adhesive joint between the heating plates... Once c and d have been reached, the press is closed. The press table e is raised and finally hits the bearing eyes ä, so that in the further The entire chassis, including carriage i, is also raised until the veneers abut the support d. This device This makes it possible to glue veneers of any thickness without adjusting any machine parts. During the curing of the adhesive joint and After releasing the locking hook S, the tensioning beams u, i are released by turning the cranks >> and the beams it, u, which are rotatable at 9, are moved. The clamping beams are swung out horizontally, allowing the carriage i to be moved back and the next veneer to be attached. n, u can occur automatically, e.g. by springs. When the carriage moves backward, the roller io of the lever strikes the stationary inclined plane ii. which raised the table back into its working position -%#@ird.

[0007] The table o is only required for joining thin veneers, since these bend even over short distances. If it is If, on the other hand, more stable veneers are used, the worktable may be omitted and the cart may also be designed somewhat differently. The clamping scheme This case is illustrated in Fig. 5. The carriage is extended beyond the press so that the veneer passes behind the press through the beams. The veneer w is clamped in the prescribed manner using the beams t, n'. "After releasing the beams, the The carriage can be pushed back to the position shown in Fig. 5 without the need to swing out the beams it, tt.

[0008] It is recommended to tilt the working surfaces of the clamping beams u, n and i, n' towards the table o. This increases the pressure on the The chamfered edges of the veneers are achieved so that even wavy veneers lie flat against the table.

Claims

[0009] PATsxTAX Si'RCCHL: t. Method for joining veneer or similar strips transversely to their grain direction, characterized in that veneer strips (in, iv) previously joined at the transverse edges in a known manner and prepared for gluing, on a cart or sled The pieces are placed together by hand outside the gluing point, clamped in place, and then inserted into the press.

2. Press for carrying out the method according to claim i, characterized in that a rotatably mounted clamping beam (n, u and n1, i) is arranged between the clamping beams (n, u and n1, i). The work table (o) is arranged and is tilted downwards when the carriage (i) enters the press by triggering a locking lever (5).

3. Press according to claim 2, characterized in that a lever (7) is connected to the rotatable work table (o), the roller (io) of which during The carriage extends up an inclined plane (tt) and thereby returns the table (o) to the working position.

4. Press according to claim 2 and 3, characterized in that the frame supporting the running rails (h) of the carriage (i) is arranged to slide on the columns (f) of the press.