FI57386B - BRAEDVAENDNINGSANORDNING VID SORTERINGS- OCH VAERDERINGSVERK FOER SAOGVIRKE - Google Patents

Description

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Patent, and Board of Registration M Nihtiviidp ™ j. Date of Publication—

Patent- och registerstyraltan Araölcan uthgd och utl.skrHtun publicund 30.04.80 (32) (33) (31) Requested «tuolkeui — Bogtrd prlorltet (71) Plan-Sell Oy, Mannerheimintie 25 A 29» 00250 Helsinki 25> Suomi-

Finland (Fl) (72) Olli Heikinheimo, Helsinki, Finland-Finland (FI) (5 ^) Board turning device at a sawn timber sorting and grading plant -

The scope of the classification between sorting and coloring matters is limited

The invention relates to a board turning device in a sawn timber sorting and grading plant, where it is intended to turn a board or the like about its longitudinal axis 180 °. The device consists of two cooperating parts: a rear turntable and a front turntable, of which the rear turntable has a side flush with the ramp against which the board rests when the turners are at rest and performs the initial turn of the board while the front turner is pushed down to a horizontal position, the turntable comes in support of said side. The front turner then returns to its rest position while completing the turn of the board. The device according to the invention is intended in particular for use on an inclined ramp, along which the pieces of timber to be judged slide under the influence of gravity.

Several proposals for board turning devices are known. The board turner can be, for example, a lever attached to a chain, which lifts the board from the conveyor and further turns it around in the direction of travel of the conveyor. The turntable is then placed in connection with a chain conveyor which usually moves on a horizontal or almost horizontal stand. The conveyor then moves continuously and the board is turned in motion.

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The main disadvantage of the above-mentioned turning device is that the turning of the board takes place in swing and even so that the board turner increases the speed of the board past the inspector. Attempts have been made to alleviate this drawback by making the speed of the turning device variable.

Thus, an attempt has been made to gain a little extra time for the inspector to inspect the board.

Finnish Patent Publication No. 53,954 discloses a device for turning elongate objects. The turning device consists of two articulated parts arranged in an oblique transport plane. There are a few significant drawbacks to the device that are annoying when using the device specifically on sawn timber grading conveyors.

Normally, the evaluation of sawn timber is performed with a sloping evaluation ramp as follows. The track to be judged usually descends automatically under the control of the turning device and stops in place. In this case, the other wide side of the board and the side are judged. The piece is then turned around the longitudinal axis and the remaining pages are graded. In this case, it is advantageous and desirable that the board does not substantially change its position during turning. It is precisely this error that occurs in the published publication, because the inverted board can only be judged when it is against the first response following the reversing device.

Among other things, the above-mentioned disadvantages have been avoided with the board turning device according to the invention. The main advantages of the device according to the invention are the following.

The board to be inspected remains in place throughout the inspection and turning only takes place at the will of the inspector. Turning takes place over a very short distance and is practically almost stationary. The turn of the board is fast and controlled. The inclined position of the board on the review ramp is advantageous, because then the inspector can better see both the wide and the narrow side at the same time.

Due to the structure, the turning device is very reliable and in practice also quite silent. This is achieved by the features of the invention set out in the characterizing part of claim 1.

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In the following, the invention will be explained in detail with reference to the accompanying drawings.

Figure 1 shows an oblique evaluation ramp from the side

Figure 2 shows the turning device according to the invention from a side on a larger scale

Figure 3 shows the device of Figure 2 from the opposite side.

According to the drawing, the board turning device 6 is placed on an inclined grading ramp 1. The grading ramp is so inclined that the pieces of timber slide along it downwards under the influence of gravity. The evaluation ramp is provided with movable stops 2 mounted on shafts 3. By means of the compressed air cylinders 4, each response is obtained separately to either the stop position or the discharge position. The position of the responses is controlled by the photocell system so that when the photocell detects that one of the locations above the responses is empty, it instructs the responses above the empty location to retract to the release position. Thus, the response system acts as a flexible store that compensates for any small irregularities that may occur in the timber supply.

After the board has run past the stops 2, it remains in the inclined position of the board turning point 6. In this position, the inspector can safely inspect the first narrow side as well as the wide side of the board. When the inspector has sufficiently viewed the board in this position, he presses a button in the inspection room, at which point the board turns. The turning is effected by the rear turntable 7 and the front turntable 8.

The front and rear turntables are mechanically connected to each other so that they co-rotate the board.

In the rest position, the rear turntable 7 is flush with the surface of the evaluation ramp.

It has two sides 9 and 10 which form an approximately right angle with each other. The longer of the former pages, indicated by reference numeral 9, is in the plane of the surface of the grading ramp when the rear turntable is in the rest position. When the board comes to the judging position, it will lean against the back flip pages 9 and 10.

The rear pivot is mounted by bearings 13, 14 on two levers on the upper support lever 11 and the lower support lever 12. The lever 11 is attached at one end to a shaft 15 mounted on the frame structure and the lever 12 to a shaft 16, respectively. The crankshaft rotates exactly one full revolution when the inspector presses a button on the control panel.

The lengths of the levers 11 and 12 are chosen so that the rear turntable, while lifting the board into the air, also tilts it forward. In cooperation with the rear inverter there is a front inverter 8. The front inverter has two sides 18 and 19 which are approximately perpendicular to each other. In their rest position, the sides 9, 10 and 18, 19 of the front and rear turntables form a shoulder ramp. The front turntable is attached to a shaft 20, which in turn is mounted on a evaluation ramp. The front pivot is further connected to the above-mentioned shaft 16 by means of levers 21 and 22 and a connecting rod 23. Thus, the same rotary rod 17 which tilts the rear pivot forward (and at the same time the board in front of it) also causes the front pivot to tilt so that its side 19 becomes approximately horizontal. At the same time, the board crashes against page 19. The final stage of the oscillating movement of the shaft 16 again returns both the front and rear turns to their initial position. As the front pivot 8 rises, it also raises the board resting on the side 19 to an oblique position. In this case, the board rests on the stop 24, where it is easy for the inspector to inspect the latter narrow and wide side of the board. After inspecting the board for the desired time, the inspector presses the button and causes the response 24 to release the board.

As can be seen from the above description, the device according to the invention offers many significant advantages. Such is, for example, the fact that the inspector is free to choose his own work rhythm and is no longer a servant working at the machine's pace. On the other hand, the device according to the invention is ergonomically satisfactory, since in it the turning of the board takes place almost in place. In this case, there is no need to move the gaze back and forth a long way.

The invention has been described above with reference to only one preferred embodiment thereof, but it is of course not intended to limit the invention to the example described above only. On the contrary, many modifications in the embodiments of the invention are possible while still remaining within the scope of the inventive idea set forth in the claims.

For example, it can be stated that the invention is not linked to the mechanical crankshaft-connecting rod drive described in the example, but can of course be replaced by e.g. a pneumatic cylinder.

Claims (3)

5 57386 A board turning device for sorting and grading lumber in a fence in which it is intended to turn a board or similar longitudinal axis about 180 °, comprising two cooperating parts: a rear turntable (7) and a front turntable (8), of which the rear turntable (7) has a value a side (9) flush with the ramp, against which the board rests when the turners are at rest, and which performs the initial turning of the board while the side (19) on the front turner is depressed to an approximately horizontal position so that the turntable enters said side (19); ) support, after which the front pivot returns to its rest position while completing the turning of the board, characterized in that the rear pivot (7) is mounted at its lower end on a lower support rock (12) which can rotate on a bearing shaft (16) and at its upper end on a second upper rock (11). on a bearing shaft (15) and the front pivot (8) is attached to the bearing shaft (20). Device according to Claim 1, characterized in that the fastening shaft (20) of the front turntable (8) is connected to one of the two fastening shafts (15, 16) of the rear turntable (7) by means of a mechanical connecting rod (23) and cranks (22, 21). Device according to Claim 1 or 2, characterized in that the upper support lever (11) is longer than the lower support lever (12).