DE10324174A1 - Device for sorting out lengths of wood has main draw means and a speed-synchronised side feed to seize wood of a certain length limit - Google Patents

Abstract

The device includes a permanently rotating main draw means (5) and outside of this a speed-synchronised side feed device (11) which seizes the wood lengths from a predetermined length with a lower friction force value and then with an upper friction force value only during the sorting cycle. With wood up to a length limit the inertia rotation remains solely under the action of the main draw means whilst longer wood is only seized by the lateral feed during the sorting cycle and is prevented from turning about its vertical axis.

Description

The The invention relates to a device according to the preamble of the claim 1.

Generic devices be u.a. from AES Advanced Equipment Systems Inc., 312A Otterson, Chico, CA 95928, USA and Conception R.P. Inc., 405 Galilee Avenue, Quebec, Qc. Canada, G1P 4M6.

The Device of the company AES has mounted on a base frame roller bed as a condition for the woods on. Depending on the arrangement of the following processing machine is located in the feed direction left or right a guide ruler, on which the woods be aligned frontally. From above, a feed engages in Shape of a circumferential brush belt the woods rubbing on.

is the device is empty at work, it drives the front Wood first against a stop, which protrudes in the stop position from the support plane, where it is aligned and stopped under feed force. The next Jam wood in the same way on the downstream woods, forming a situation.

The brush belt is dimensioned in its width and in its distance from the guide ruler so that longer woods, which are supported in the accumulated position on shorter woods, not a vertical one Turn axis. The distance of the resultant of the wood acting on the woods Feed force to guide ruler is smaller than the length the shortest wood to be separated.

It There are signalers that indicate if a wood is at the stop lies; whether the minimum width has been reached; whether the receiving organs the following machine are in the receiving position.

If these conditions are met, the stop is switched in a first phase down below the support level, each releasing the first wood, and switched up after an adjustable in relation to the wood width time back up, the top of the stop in a 2 , Phase under the outgoing wood and raise this, in time to stop the next layer on the next wood, while the isolated wood in one 3 , Phase over the stop top is sliding away transported by the brush belt.

The expected separation performance is 120 wood per minute, the feed rate of the brush ribbon is while about 35m / min.

The Position is thus clocked in 0.5s cycle to wood width, while on 35m / min accelerated and braked abruptly. Especially long woods, whose center of gravity lies outside the brush belt area doing so big torques about their vertical axis that they are clearly turning clockwise and anticlockwise. Your front edges butt against the guide ruler, and the woods remove themselves and through the weighing movement of the adjacent woods more and more of the guide ruler, get wrong against the attack, it comes to disturbances.

ever shorter the shortest To be separated wood, the narrower the brush belt be the closer is the resultant of the feed force on the guide ruler, the greater are by the inertia long woods given torques when accelerating and stopping.

It Therefore, the object of the present invention is a device specify the type mentioned, with the woods in the situation can be advanced with a high clock rate, without that they are in consequence of excessive inertial rotation inadmissible far from the guide ruler remove or lean against the stop.

Is solved This object by the characterizing features of the claim 1.

With woods up to a limit length L limit ≈ 3 × Lmin the inertia rotation remains under the effect of the main feed ( 5 ) within permissible limits. Longer woods are fed during the singling cycle from the side feed ( 11 ) and prevented from twisting about its vertical axis.

The invention is based on the 1 ... 3 explained in more detail in one embodiment.

It demonstrate:

1 an inventive separation device in a schematic side view,

2 an inventive separating device in a schematic plan view, wherein the main and side feed are shown as a dash-dotted outline,

3 a partial section through the inventive separation device with viewing direction downstream.

Woods ( 1 ) are in irregular Ab from the feed belt ( 01 ) of the separating device ( 2 ) and at regular intervals from the subsequent processing machine ( 02 ) dissipated. The general direction of conveyance is indicated by the arrow ( 3 ). The woods are frontally on the guide ruler ( 4 ).

Under the effect of the main feed ( 5 ), on the wheels of the edition ( 6 ) sliding at the stop ( 7 ) to a situation ( 8th ) dammed up. The Hauptreibkraftrultultierende thereby acting from the main feed on the woods is characterized by the vector ( 9 ) whose distance (e) to the guide ruler ( 4 ) is smaller than the smallest wood length Lmin to be singulated. Thus, it is impossible that wood under constant back pressure for an edition ( 6 ) turn the vertical axis.

Cantilevers ( 10 ) take the main feed ( 5 ) and also the form feed ( 11 ) adjustable to wood thickness.

The form feed ( 11 ) is additionally relative to the main feed ( 5 ) via adjusting screws ( 12 ) adjustable in height. Main and side feed are designed as circulating brush belts and by means of the propeller shaft ( 13 ) speed synchronized.

The form feed ( 11 ) can be adjusted via the adjusting screws ( 12 ) are adjusted in height so that the bristles with a very low frictional force Fv0 permanently act on the longer woods, but then the sum vector of Hauptreibkraftresultierender and Fv0 still a distance small Lmin to the guide ruler ( 4 ) must have.

In In the illustration, the bristles are out of contact with the woods, Fv0 = 0.

The lower pull cord ( 11a ) of the page feed ( 11 ) is attached to the pressure plate ( 14 ) removed via the switchable pressure-medium-loaded actuator ( 15 ) and the return springs ( 16 ) is raised and lowered. The actor ( 15 ) may be a single acting pneumatic cylinder or preferably a pressure pad. When using a double-acting cylinder, the return springs can be omitted.

In the case of isolation, the attack ( 7 ) briefly downshifted, releasing the frontmost wood.

At the same time, the actuator ( 15 ), the bristles of the tensile strand ( 11a ) sink onto the longer woods and impinge on them with the feed force Fv1. The location ( 8th ) moves to wood width. As soon as the frontmost wood hits 7 ), the actuator ( 14 ) switched up again.

Claims (1)

Device for separating logs of irregular length L, of the smallest length Lmin and the greatest length Lmax, which lie against one another with their longitudinal sides under dynamic pressure in one layer, with a) a low friction lining on which the woods are movable downstream, b) a guide ruler with for supporting vertically extending alignment plane against which the woods are unilaterally aligned approximately forehead, c) one from above the woods permanently frictionally engaging, with elastic contact members, such as bristles or lamellae, provided, designed as a permanent circulating traction main feed, each wood with the d) a stop, against which the respective first wood of the position at rest with ram pressure is applied, which stop in the separation cycle by lowering under the support and / or by lifting the first wood is overcome, characterized in that except the main feed ( 5 ) with this speed synchronized form feed ( 11 ), the woods ( 1 ) in a position ( 8th ) starting from a predetermined length L limit (Lmax> L limit> Lmin), lasting with the lower friction force value Fv0 ≥ 0, and only switchable during the singling cycle with the upper friction force value Fv1> Fv0.