FI99097B - Arrangement for controlling an overlying pressure roller arranged in conjunction with a machine tool - Google Patents

Abstract

Arrangement for controlling an overlying pressure roller 7 arranged in conjunction with a machine tool, such as a balk chipping cutter, intended for machining a balk 1 or a log. On both sides of the timber the machine tool carries machining elements 2, 2' adjustable according to the width of the said timber, which are coupled to guides 3, 3', which drive them in the transverse direction of the machine tool. The guides are controlled by means of a drive arrangement so that they correspond to the width of the timber. The pressure roller is driven in an upright direction by means of the cylinder connected thereto, the cylinder being controlled by a control arrangement 4, 15. In order to keep the surface contact pressure, which the pressure roller 7 produces on the timber, essentially constant, regardless of the width of the timber, the arrangement carries a wedge element 8 arranged in the guide 3 and moveable therewith, a lifting arm 9 rotatable according to the position of the wedge element, and an adjusting element 11 controlling the cylinder 8 and connected to the control arrangement, the control element 14 of which adjusting element is connected to the lifting arm 9 in order to determine the distance between the machining elements so that, with the information determined by means of the wedge element, the control unit 11 controls the pressure roller 7, so that it presses the timber with a force that varies according to the width of the timber. <IMAGE>

Description

99097

EQUIPMENT FOR CONTROLLING THE UPPER PRINT ROLLER IN CONNECTION WITH THE MACHINE

The present invention relates to an apparatus according to the preamble of claim 1 for controlling an overhead printing roller in connection with a machine tool.

FI patent 83847 discloses a chipper in which a beam machined on all four side surfaces is formed from two plain ones machined on two opposite side surfaces. The chipper is equipped with two chipping discs. The discs can be moved by trolls of different widths, respectively, each with its own servo device.

15 After the chipper there is a pressure roller above the conveyor, which is mounted on pivot arms which are actuated by a cylinder which can be controlled by a control unit so that the roller presses only or is detached from it. Also in front of the chipper is the in the apparatus according to the patent, a pressure roller mounted on the swing arms bearing-20.

The disadvantage of current equipment is that the upper roller always presses the force with equal force, regardless of the width alone. Especially at small widths alone, the surface pressure then becomes too high, and the sheer alone can be damaged.

The object of the present invention is to obviate the drawbacks of the prior art and to provide a new type of apparatus for controlling the upper roll 30. Characteristic features of the apparatus according to the invention. detailed in the appended patent claim

With the apparatus according to the invention, a uniform surface pressure 35 is achieved regardless of the width of the timber. Thus, especially with small widths of timber, it remains undamaged. With large widths, on the other hand, a sufficiently large force can be achieved in terms of operation to press the timber against the conveyor.

In the following, the invention will be described in more detail by means of an example with reference to the accompanying drawing, which schematically shows from above a device according to the invention arranged in connection with a chipper alone.

10 The drawing shows a chipper in which a beam machined on all four sides is formed from two sheets machined on opposite sides by further machining it with two chipping discs 2, 2 * of the chipper. The chipping discs can be moved in the transverse direction of the chipper along guides 3, 3 'to adjust the width of the chipper by a servo device (not shown) controlled by a control unit A. In front of the chipper there is a conveyor along which only 1 enters the chipper from the side board separator.

On the feed side of the chipper, a pair of side rollers 5, 5 'is arranged to support the panel alone in the lateral direction. The rollers of a pair of rollers are arranged on different sides only. In addition, in front of the chipper there is an upper pressure roller 6, which can be mounted on pivot arms which are acted upon by a cylinder. After the chipper, a second upper pressure roller 7 is arranged, which is moved vertically by means of a vertical guide above it and a vertical printing cylinder 8 fitted to it so that, if necessary, it presses against the conveyor alone.

30

As already stated above, with the apparatus according to the invention it is possible to achieve a constant surface pressure on the surface alone, regardless of the width alone. This is achieved by controlling the cylinder 8 with an apparatus according to the invention, 3 99097 comprising a wedge 8 fixed to the second guide 3, widening evenly towards the disc 2, a roller 10 articulated along it, articulated to the end of the lever arm 9 and a pressure relief valve 11. -5 with a fastening part 12 at one end to the wall 13, and is further connected in the middle by a hinge connection to the valve control stem 14. The pressure relief valve 11 is further connected to a control valve 15 which is controlled by a control unit 4.

10

The apparatus according to the invention operates as follows: When only 1 enters the chipper, the pairs of side rollers 5, 5 'and the front pressure roller 6 guide it between the chipping discs 2, 2'. When the already machined beam comes out of the chipper, the pressure roller after the chipper 15 presses 7 beams towards the conveyor. The distance between the chipping discs 2, 2 'is adjusted to the width alone by moving the guides 3, 3' in a direction transverse to the direction of travel alone. As the guide 3 above in the drawing moves, the wedge arm 9, which controls the pressure relief valve 11 by means of a guide spindle 14, also turns against the wedge 8 due to the rotating roller 20 10.

The pressure relief valve 11 controls the pressure cylinder 8 according to the width of 1 alone, so that when 1 alone is wide, the chipping discs 2, 2 'are further apart and the stem 14 is depressed inside the valve 11. In this case, the cylinder 8 guides the pressure roller 7 to press strongly against the beam. Correspondingly, in the case of the narrow play 1, the mandrel 14 is only slightly fed inside the valve 11, and the roller 7 presses against the beam with a correspondingly smaller force, so that the surface pressure is not equal to that of the wide case alone.

The shape of the wedge 8 should be chosen so that a constant surface pressure is achieved with the desired widths alone. In order to adjust the position 4 99097 of the wedge 8 and thus the force of the printing roll 7, adjusting screws 16 can be used, with which the wedge 8 is fastened to the guide 3.

The front pressure roller 6 can also be adjusted with corresponding equipment 5.

It will be clear to a person skilled in the art that the various embodiments of the invention are not limited exclusively to the example given above, but may vary within the scope of the 10 claims set out below.

Claims (5)

5,99097 1. Apparatus for controlling an upper pressure roller (7) connected to a machine tool for working a log (1) or a log, such as a wood chipper, which has width-adjustable machining members (2,2 ') on two sides / controlled by a drive device corresponding to the widths of the timber, and which is moved vertically by means of a cylinder (8) connected to it, which cylinder is controlled by control equipment (4, 15), characterized in that the surface pressure of the printing roller (7) on the timber is substantially constant regardless of the width of the timber the apparatus comprises a measuring device (8,9) for measuring the distance between the machining members and a control unit (11) which, by means of distance information from the measuring apparatus, controls the pressure roller (7) to press the timber with a force varying according to its width. 2. Apparatus for controlling an overhead pressure roller (7) connected to a machine tool 25, such as a wood chipper, for working alone (1) or a log, the machine tool having on its two sides adjustable width members (2,2 ') connected to the machine tool. transversely movable guides (3,3 ') guided by a drive to match the width of the timber, and 6 99097 which is rolled vertically by means of a cylinder (8) connected thereto, the cylinder being guided by a control apparatus (4,15), characterized in that, that in order to keep the surface pressure caused by the printing roll (7) on the timber substantially constant, regardless of the width of the timber, a guide wedge member (8), a lever arm (9) pivoting according to the position of the wedge member (8) and a cylinder (8) 10 a connected control member (11) having a control member (14) of y connected to determine the distance between the machining members of the lever arm (9) so that the adjusting member (11) guides the pressure roller (7) to press the timber with a force varying according to its width 15 by means of the distance information determined by the wedge member (8). Apparatus according to claim 2, characterized in that the wedge member (8) is connected to the guide (3) by means of an adjusting member (16), such as adjusting screws, for adjusting the position 20 of the wedge member. Apparatus according to Claim 2, characterized in that the control element (11) is a pressure relief valve. Apparatus according to claim 2, characterized in that a roller (10) or the like rotating along the wedge member is arranged at the wedge-side end of the lever arm (9), and that the other end of the lever arm is articulated to a fixed structure such as a wall (13). 7 99097