DE1653114C3 - Veneer joining machine - Google Patents

Description

second shift lever 50 is provided. The former is capable of a three-position valve 51 and the latter two blocking valves 52 to operate.

The operation of the veneer laying machine 10 will now be explained with reference to FIGS. 1 and 2. First, the shift lever 49 is placed in its upper position ("1") so that a pressure line 54 is connected to a pressure line 55 via the three-position valve 51. This creates a pressure so that they and au. "* ¹ the printing table 24 upward move under the piston 38.39. N'unme. r you push the veneer stack 25 between the _-n. h 59 and the

raised printing table 24.

Then you go with cL · .. ■> - '. 49 about the Position "0" on the Si. .ung »-«, in which the Three-position valve 51 connects the pressure line 54 to pressure lines 56, 58, 59 and 60. D & s through the Switching lever 50 actuated shut-off valve 52 is open in this case. There is now a pressure above the pistons 36, 38, 39 and 40, causing them to move downwards and the stack of veneers 25 / wipe the Printing table 24 and the Auflagctisch! 9 is firmly clamped.

If you want to clamp a film clip 25, the /. B. only half as long as the one drawn, so lays one him under the area of the piston drives 28, 29 and switches mn the help of the shift lever 50 the Stop valves 52 from. so that on the pressure lines 56, 50 no pressure can get. Bends when pressed then de printing table 24 not through at its ends.

With the veneer joining machine 10 msn can except Veneer panels also hol /, blockboard. Fiber and plastic sheets, thin non-ferrous and light metals and Cutting sheets of synthetic glass. For the piston drives one will mostly use compressed air.

1 sheet of drawings

Claims (1)

Claim: Veneer joining machine with a fixed support table, with a saw carriage and with an upper, relative to the support table movable printing table with several, at a distance from each other and above the length of the printing table is driven distributed arranged piston drives, and with a Control device for the piston drives, characterized in that the outer Piston drives are soundable. The invention relates to a veneer joining machine with a stationary support table with a saw carriage and with an upper, relative to the support table movable printing table with several, in the Aostand is driven from each other and distributed over the length of the table arranged piston drives, and with a control device for the piston machine. By the German utility model 18 23 507 is a veneer joining machine with a stationary support table known, which on the underside of the press beam c'ne number> n vertical direction has adjustable pressure plates, the working cylinders of which are interconnected by a communicating line system are connected as a pressure compensation device. The printing plates are in the longitudinal direction of the printing table seen arranged immediately next to each other. This training the well-known. Veneer joining machine has the consequence that on a: backplate. the only with a narrow edge area is supported by a veneer package that is significantly shorter than the length of the The same force is exerted on the pressure plates that cover their entire surface are supported on the veneer package. This in turn leads to the fact that only a small part of it on the veneer packet supporting pressure plate under the influence of the piston of its working cylinder exerted force can deflect. Even slight bends in the length of the length lead to the this pressure plate adjacent edge of the veneer package is pressed harder than the middle area of the Veneer package. Such different pressures are undesirable because they, if the veneer pack is to be trimmed, lead to a different formation of the cutting edges. In another known veneer joining machine, hydraulic piston drives are provided with whose help you put a stack of veneers between a moveable pnctisrh and an immovable one Support table can press. Very long veneer packages are cut in the middle and then pressed separately in the two halves of the machine. If you only have veneer packages half as long, then if you only press it in one half of the machine, its printing table then also over the entire length is busy. If the printing table is elastic in this machine. that he follows the form of the Can adjust the veneer stack, and if you then press much shorter veneer stacks, also results here a hump. In particular, however, the edges of the veneer stack are pressed much more strongly than that intermediate areas what differed in borrowed cutting results is reflected (I IS-PS 32 42 954). There has also become known a cutting machine for paper and cardboard in which the press pressure b-special for sensitive items to be cut and also when stacks are to be cut one behind the other that are in the Sections have greater differences on one desired height can be adjusted. Such However, the measure only always achieves the same in the same volume element of the paper to be pressed Compression pressure when the compression force is introduced at the ends adaptable printing table not only apply the necessary force at its ends. In addition, in cutting machines for paper and cardboard, the punch knife also acts in the direction of the Printing table pressure and supports it during the cutting process. With veneer joining machines on the other hand, the tools, which have very low speeds, run in the direction of the sheet, causing the veneer sheets can be excited to vibrate (DT-AS 10 93 774). It is the object of the invention. specify a veneer jointing machine of the type mentioned above, in which you can also cut veneer packets that are significantly shorter than the veneer jointing machine without the printing table making a hump and the side edges of the ^Γ ι ^! e packets are pressed more strongly than in the middle . According to the invention, this object is achieved by that the outer piston drives can be switched off. The veneer joining machine according to the invention has the fact that for the outer, over a short stack protruding parts of the printing table, the piston drives can be switched off, the advantage that a stronger one Pressing the veneer on the edges is reliably avoided. The invention is described below with reference to a preferred exemplary embodiment. In the Drawing shows F i g. 1 is a partially broken front view of a veneer joining machine, F i g. 2 a compressed air circuit. A veneer joining machine 10 has a stand 11 with feet 12. A guide rail 14 is attached to the stand 11, which serves as a guide for a saw carriage serves, which in the plane of FIG. 1 can be slid from left to right and vice versa. A Electric motor 16 drives a saw blade 18. On top of the stand 11 is a support table 19 is provided, which extends almost over the entire width of the veneer joining machine 10. An equally far exciting yoke 20 is connected by legs 21 rigidly connected to the stand 11 and the support table 19 so that a gap remains the sufficient Piaiz a print table 24 umt a veneer stack 25 provides In the drawing, the state is fixed, η the the stack of veneers is being pressed by the printing table 24 against the support fsch. The necessary pressure is applied by piston mounts 26, 28, 29 and 30, the cylinders 31, 32, 34 and 35 and pistons 36,38,39,40 including piston rods 41,42, 44, 45 own. The latter are with their according to FIG. The lower end is rigidly attached to the printing table 24. In addition, two tension springs 46, 48 are anchored on the printing table, which on the other hand are also anchored to the hole and seek to lift the printing table.
At | och 20 there is still a first shift lever 49 and a