FI71084B - FOER FAR INSPECTION FOR SAFETY FACILITIES AND ANGLE FITTING AT FOERVER - Google Patents

Description

71 084 1 Method at the end of a sawmill and apparatus for carrying out the method For the production of sawdust and the preparation of the method for the preparation of the method 5

The invention relates to a method for end-to-end conveying saws in connection with a transverse and longitudinal conveyor for saws, in which the saw-blades are conveyed by a transverse conveyor end transfer is performed.

The invention also relates to a device for carrying out the method.

In the previously known methods and devices on which the invention is based, the coulter conveyor moves the saws in the transverse direction, while against this conveyor the transverse roller conveyor moves the pieces 20 in the longitudinal direction. When the longitudinal displacement of the saws has reached a predetermined distance, e.g. In order to prevent the saws 25 from continuing to move longitudinally by sliding on the lifting members, which they tend to do under the influence of mass inertia forces, and since the friction between the lifting members and the saws cannot completely prevent this, the device is usually fitted with a sloping stop.

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A solution such as that described above is presented in FI patent No. 64,907, which discloses a response device used in the handling of sawn timber, in which a curved response is used against which the saws push the saws. The response 35 used in the method according to FI patent 64,907 is in itself very precise, but the control of the lifting members arranged in connection with the roller assembly has proved difficult in practice, as it is quite difficult to get the movement of the lifting members accurate. Creating the movement of the lifting members 2 71084 1 with sufficient accuracy easily makes the device very complicated and expensive.

Swedish Patent No. 383,121, on the other hand, discloses a method and apparatus for cutting the base end of a saw blade, in which the movement of the saw is performed by a roller against a movable abutment surface. In the solution according to SE patent 383 121, a conveyor belt is used as the abutment surface. However, even this previously known solution cannot prevent the longitudinal movement of the sawn goods from continuing even after the transfer effect of the transport rollers has ceased, but the stopping remains to be performed by the lifting members. In the solution according to the SE publication, the entire end transfer has to be performed with a single roller spacing, which is generally 600 mm. Since the maximum end displacement can be 300 mm, which is the most common modulus of sawn timber, the end displacement must take place quickly, which causes inaccuracy, in particular due to the effect of mass inertia forces. The limited friction between the lifting members and the sawn timber, as well as the mass sawing forces, therefore cause the sawn timber not to stop immediately and accurately in its longitudinal lifting position, but to continue the indefinite distance forward. This means inaccurate cutting of the timber 20.

It is an object of the present invention to provide a method and apparatus for end transfer of saws which do not have the disadvantages described above. To achieve this, the method according to the invention is mainly characterized in that when said required end shift is opposite from the input line to the direction of transport of the longitudinal conveyor, the end shift is performed with an adjustable response in the response area , after which the saws are moved to the final position corresponding to the end transfer with an adjustable response.

The device according to the invention, in turn, is characterized in that the response 35 is arranged to be adjustable in the longitudinal direction of the saws, i.e. transversely to the input line of the saws, in order to obtain an end shift of the desired size in either direction of the input line.

If 3 71084 1 The solution according to the invention achieves several advantages over the previously known solutions, of which e.g. following. The end transfer of the saws can be performed in either direction, whereby the maximum transfer distance can be halved. When, for example, in SE patent 5,383,121 the maximum end displacement can be 300 mm, the maximum displacement required in the solution according to the invention is only 150 mm. The invention makes the position of the saw very precise, because after the response the position of the saw is determined by the trailing edge of the response. The saw always settles in the correct exit line after the response, regardless of which direction the end of the saw 10 is inclined.

In the following, the invention will be described in detail with reference to the figure of the accompanying drawing, which shows an embodiment of the invention in a top view.

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A transverse conveyor, e.g. the grooves 2 of the moth conveyor, moves the saws 1 in the polar direction and preferably at a constant speed towards the abutment area A and the cutting blade possibly located after the abutment area A (not shown). Prior to the response area A, the required end transfer to the saw 1 is predetermined in a manner known per se, e.g. as disclosed in FI patent 64,907, by marking the required end transfer to the saw 1 with a fluorescent dye. The saws 1 move into the abutment area A so that the ends of the saws 1a run along the same input line X. A longitudinal conveyor in the abutment area A, e.g. roller roller 3 of the roller conveyor 1, moves the saws 1 in the longitudinal direction so that the saw ends 1 contact the abutment 4. The stop 4 is preferably plate-shaped, the plane of which is preferably arranged vertically. The stop 4 is articulated to pivot relative to the vertical axis 6 around which it can be pivoted by means of an actuator 5, suitably a hydraulic servo cylinder 30. When the position of the stop 4 is set by the actuator 5 according to a predetermined end displacement, the saws 1 pass past the stop area A so that the rollers 3 of the roller conveyor push the ends of the saws towards the stop 4 along which they slide past the stop area A. The position of the saws 1 in the transverse direction after the response area A is thus determined on the basis of the abutment leaving edge 4a, whereby the position of the saws 1 after the response area A is very precise.

71084 1 The position setting of the stop 4 depends on which direction the end shift defined for the saw 1 is intended to be performed. If the end displacement y 1 defined for the saw 1 is intended to be performed away from the stop 4, i.e. in the opposite direction to the conveying direction 5 of the rollers 3 of the roller conveyor, the necessary end displacement y 1 is performed by means of the stop 4. If the required end displacement y ^ is intended to be performed towards the stop 4, i.e. in the same direction as the conveying direction of the roller conveyor rollers 3, the necessary end displacement y ^ is initially performed by the rollers 3 towards the stop 4 initially set bigger. The final fine shift is then performed with a stop 4 set to the position corresponding to the shift y 1.

The method and device according to the invention provide a very precise end transfer of the saws, because the ends 1a of the saws remain pushed by the rollers 3 of the roller conveyor towards the stop 4 after the stop area A. After the stop area A the saws 1 remain in the position defined by the stop edge 4a. Since the rollers 3 constantly press the saws 1 towards the stop 4, the ends 1a of the saws are not prone to detach 20 from the stop 4, as a result of which a fairly high driving speed of the cola conveyor can be used.

The invention has been described above by way of example with reference to the figure of the accompanying drawing. However, it is not intended to limit the invention 25 to this embodiment only, but many modifications are possible within the scope of the inventive idea defined by the following claims.

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Claims (7)

A method of longitudinally displacing said wood pieces in conjunction with a cross conveyor (2) and a longitudinal conveyor (3) for said wood pieces (1), in which method said wood pieces (1) are conveyed by means of the cross conveyor (2) in such a way that the ends (1a) of the said wood pieces run substantially along the same entrance line (X), at which a required longitudinal offset is determined for the said wood pieces (1) before they (1) arrive at a stop area (A), where the length conveyor ( 3) is located and where said longitudinal displacement is characterized in that the longitudinal displacement (yp is carried out by means of an adjustable stop (4) located in the stop area (A) where the required longitudinal displacement (yp is opposite from the input line (X) in the relative to the transport direction of the longitudinal conveyor (3) and where the required longitudinal displacement (y the pieces (1) by means of the longitudinal conveyor (3) a greater distance is the determined longitudinal displacement (y ^), after which the said wood pieces (1) are displaced to the final position corresponding to the longitudinal displacement (y ^) by the adjustable stop (4). 1 Patent claim 2. A method according to claim 1, characterized in that when the said timber pieces (1) are conveyed by means of the transverse conveyor (2) over the abutment area (A), the said timber pieces (1) are always kept in the grip of the longitudinal conveyor (3). ) of the said wood pieces by means of the length conveyor (3) is in contact with the adjustable stop (4) within the entire stop area (A). Apparatus for carrying out the method according to claim 1 in longitudinal displacement of said wood pieces in conjunction with a cross conveyor (2) and a length conveyor (3) for said wood pieces (1), wherein said cross conveyor (2) is arranged for said wood pieces of conveyor ( 1) in such a way that the ends (1a) of the said wood pieces extend substantially along the same input line (X), whereby a required longitudinal offset is determined for the said wood pieces (1) before they (1) reach an impact area (1). A), wherein said length conveyor (3) and a stop (4) arranged in conjunction with said stop (4)