FI114294B - Plan reducer cutter head - Google Patents

Description

114294

The chopper head only

The invention relates to a chopper head only, as defined in the preamble of claim 1.

5 In the saw mill's chopping line, the opposite sides of a piece of wood, such as logs or plain, are machined and chipped to a flat surface, followed by actual logging or plain sawing. We refer, for example, to Fl-Patent Publication No. 73378.

1 and 2 of the drawing 10 and its operation is illustrated in Fig. 3. The cutting head 1 of the chopper only comprises a body 2 and a plurality of chipping blades 3; 31, 32, 33, 34, 35, 36. The chipping blades 3 are arranged in connection with the body 2. They are circumferentially attached to the periphery of the body 2 and are spaced at regular intervals. In this case, the chipping blades 3; 31, 32, 33, 34, 35, 36 are arranged at an angle of 60 ° to the outer circumference of the body 2. In addition, the blade head 1 includes a circular blade 4 arranged in connection with the body 2, which is in the vicinity of the chipping blades 3. The blade head 1 is rotated from the shaft by a suitable power device, such as an electric motor (not shown in the drawing).

The rotary blade 4 is removably attached to the body 2. In turn, the chipping blades 3 are also releasably attached to the outer periphery 2a of the body 2 so that their steel edges 20 extend in proximity to the teeth 5 of the rotary blade 4, as illustrated in FIG. The rotating blade 4 and the chipping blades 3 rotate in the direction B at the same rotational speed. The circular blade 4 acts as a surface blade which leaves the saw or groove on the surface of the plain or Parru without tearing the wood. The chip blade 3, in turn, mills the chips from the wood on the other side of the sawing groove. The rotational pattern 30 of the chipping blades 3 is partially shown in Figure 2.

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The two blade ends 1 are disposed opposite to each other in an adjustable distance on the chopping line alone. The blade heads 1 are driven in the same direction by suitable power units · * ·. la, like electric motors. A workpiece is driven between the blade ends 1 so that its opposite sides can be machined simultaneously.

• 30 A problem with the known chopper is that the feed rate of the log is limited.

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When the cutting speed of the chipping blades exceeds a certain limit, the chips are fragmented; *. 114294 2 is much less expensive than good quality chips. The cut-off speed mentioned depends on the type of wood and its condition (such as dry, wet or icy). ).

One obvious solution to the above problem is to increase the chip length, whereby the feed rate of the lump can be increased accordingly. This 5, however, brings with it new problems, because as the length of the chips increases, the circular blade in the blade head cuts deeper into the wood and the deburring of the circular blade tooth groove becomes more difficult. This causes the rotary blade to become clogged, which results in at least a deterioration of the sawing surface and, in the worst case, the rotor blade may break.

10 The above problem is illustrated by the following example. Referring specifically to Fig. 3, for a smooth and benign sawing trace of the round blade 4 of the blade head 1, the bite (feed / tooth) of the round blade teeth 5 must be small enough, preferably 2 mm or less. Accordingly, two successive chipping blades 3; 31, 32 to a circular steel sector 40; 401 must accommodate at least 15 thirteen teeth 5 when the depth L (and corresponding chip length 1) of the groove U is 26 mm. Further, it should be noted that the tooth 5 of the rotary blade must extend in each rotary blade sector 40; 401 chipping blade 3; 31, 32 in such a way that the chipping blade 3 does not tear holes in the wood material P on the other side of the circular blade, even at the knife points. In other words, the saw groove U must be left when the chipping blade 3 is cut from wood with a chip length P1, i.e. the ratio of the saw groove depth L to the chip length L> 1. Furthermore, the tooth groove 6 between the round blade teeth 5 to the side of the chisel blades 3 to the clearance of the sawing groove “: U and the tooth groove 6 (arrow C, Fig. 3) of the circular blade 4 throughout the cut. When: the tooth height and bite of the circular blade 4 is high, the amount of chew produced during processing does not fit, ..: 25 and thus cannot be disengaged from the cogged tooth slots 6. · ·. and downstream of the chipping steel sector 40. As the problem is solved in a straightforward manner, the length h of the rotary blade teeth 5 is increased and their number in the rotary blade sector 40 between the blades 3 is increased. The problem is that the teeth 5 become so tall and so large that ··· * 30 the strength and stiffness of the teeth are no longer sufficient and can easily be broken during use.

* ;;; It is an object of the invention to eliminate the drawbacks associated with the above-mentioned blade head '·; · *. It is also an object of the invention to provide a new blade tip for: Y: Disc.

I a a 114294 3

The plain chopper blade head according to the invention is characterized by what is set forth in claim 1. The dependent claims disclose preferred embodiments of the invention.

The simple-chopper blade end of the invention has a body, a plurality of chipping blades 5 disposed circumferentially in relation to the body at a distance from each other, and a rotary blade mounted in connection with the body in the vicinity of the chopping blades. According to the invention, the blade end has a machining member arranged in each rotary blade sector between the chopping blades and having a machining blade section arranged on a saw blade line and having a blade width in a plane at least partially expanding the sawing groove provided with the circular blade for the wood to be treated with the circular blade.

The idea of the invention is that the machining member widens the sawing groove while the saw-groove groove is formed with a circular blade. The advantage is that a loose passage is provided for the deburring thus discharged from the sawing groove.

In the most preferred embodiment of the invention, the cutting element of the machining member has a cutting steel edge which is inclined in a plane perpendicular to the direction of rotation of the circular blade and inclined particularly to the side of the chipping blades which extends the mouth.

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In the above embodiment of the invention, the machining member widens the mouth of the saw groove in particular while forming the saw groove. In this case, in particular, the wedge-shaped point of the chippings to be cut is preferably shortened by a length of the edges, which is • sufficient to guarantee the passage of the path out of the sawing groove.

Another advantage of the invention is that it is possible to lower the teeth of the rotary blade over time; tooth length. In principle, the height of the teeth can be reduced by the length of the cutting edge of the machining member, thus reducing the length of the chip: In this way, the round steel becomes durable and efficient.

Thanks to the invention, the number of teeth of a circular blade can be increased in the circular saw blade sector in relation to the prior art. Low teeth: fits more in the same size round blade sector than in the prior art solution.

114294 4

Alternatively to the above, the number of chipping blades can be increased, while their angular distance and the center angle of the sector can be reduced, so that the rotary blade sector still holds as many teeth as before.

In both of the above cases, the advantage is that the blade head rotation speed 5 can be increased higher than before and also the feed rate of the timber to be processed.

Alternatively, instead of or in addition to the above advantage, the quality of the machined sides alone can be improved, since the number of teeth in the round blade sector can be increased over the previous number at the angular distance of the chisel blades used.

A further advantage of the invention is that the chip length to be processed by the blade head can be increased. In the rotary blade sector, teeth can be inserted between the chisel blades and thus also the depth of the cutting groove increased with the bite of the teeth.

A further advantage of the invention is that the cutting gap to be machined with a circular blade can be narrowed. Because the teeth of the circular blade are shallow, they are preferably also thin, with a narrow groove. The sawing groove is generally narrower than known blade heads. It also has the advantage that a portion of the wood lost in cutting the tip portion of the chip is replaced by a narrow sawing groove.

In the following, the invention will be described in detail with reference to the accompanying drawing, in which »>« «, * ·, Figure 1 shows a side view of a prior art chopper blade only. tuna; Fig. 2 is a partial sectional view A-A of Fig. 1; Fig. 3 is a schematic partial cross-sectional view of a prior art blade head; Fig. 4 is a side view of a circular saw blade; Fig. 5 shows a partial cross-sectional view D-D of the machining member in the rotary drill of Fig. 4; and Fig. 8 schematically shows a partial cross-section of the knife head according to the invention in the second step.

5 In the figures, like reference numerals are used for like parts.

Figures 1, 2 and 3 of the drawing are discussed above when describing a prior art plaque cutter blade end.

Part of the blade head 7 of the plain chopper according to the invention is illustrated in Figure 4. The blade head 7 has the same parts as the prior art blade head 10 in Figures 1 and 2. The blade head 7 comprises a body 2, a plurality of chipping blades 3; 3, 3 disposed circumferentially with respect to the body 2 at a distance from one another. The circular blade 8 is arranged in connection with the body 2. Round blade 8 and chipping blades 3; 31, 32 are suitably mounted close to each other in substantially the same manner as the known blade end of Figures 1 and 2.

The circular blade 8 has the same basic structure as the previously known circular blade 4.

v · The periphery of the circular blade 8 has a plurality of teeth 9 and a notch 10 between them.

Three successive chipping blades 3; 3, 3 ”, 3 positions are illustrated with *: HP arrows only; HP1, HP2, HP6 in Figure 4 (and, for illustrative purposes: ··· also in Figure 1). Chipping blades 3; 31, 32 to a circular steel sector 40; 401,. ··. 20 402 is provided with a certain number of teeth 9, in this embodiment thirteen teeth. · · ·. to form a sawing groove U into wood P

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10

According to the invention, a working member 11 is provided in connection with the blade head 7; 11, 11,: ...: with a working blade portion 12 arranged on a cutting line of a circular blade 8, i.e. a plane of a circular blade at the height of its teeth. The width TE of the blade portion 12 of the machining member 11 in a plane perpendicular to the direction of rotation B of the rotary blade 8 is greater than the width T of the rotary blade teeth 9. The machining member 11 is imitated to cooperate with · \: To extend at least part of the groove U.

In the most preferred embodiment of the invention, Fig. 5, a working member 11; l1, l2 blade-30 portion 12 has a cutting steel edge 12a having an angle? in a plane perpendicular to the direction of rotation is between 0 ° and 75 °, preferably 45 °. Furthermore, the angle α is particularly on the side of the chipping blades 3 when it exceeds 0 °. In particular, this steel edge 12a extends the SU of the saw groove U, as illustrated in Fig. 8 by 114294 6. The length S and the angle α of the cutting edge 12a are selectable. They also depend on the width TE of the machining member 11.

One or more machining members 11 can be fitted to the rotary blade 8. Most preferably, one machining blade 11; li1, li2 are arranged between the chipping blades HP1, HP2 (cf. chips 5, 3, 3 in Figure 1) in each of the circular steel sectors 40; 40.40.

Preferably, the machining member 11 is mounted on the rotary blade 8. In this case, the machining member 11 is preferably formed as an auxiliary tooth of the rotary blade 8, such as e.g. 4 and 5 are illustrated.

The height TK of the machining member 11 in the radial direction of the rotary blade 8 is greater than the height hu of the rotor teeth 9 (cf. Figure 4). Preferably, the height 9 of the teeth 9 of the rotary blade 8 in the radial direction is smaller than the tooth height h of the rotary blade 4 of the known blade end. The teeth 9 are thus shortened relative to the previous tooth length h. The height hu of the teeth 9 is reduced relative to the previous height h at most by the length S of the blade edge 12a of the blade portion 12 (cf. Fig. 7). The chip tip K of the chip is shortened by said length S and also corresponds to the widening of the saw groove U at the mouth SU.

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Machining member 11; 11, 11 is preferably arranged in connection with the rotary blade 8 such that ;;; it is 40 for each sector; 40.40 in the center region at a suitable angle distance β at ··· * and after a suitable number of teeth 9, such as four teeth, from the preceding ha · · 20 friction blades 3; 3, 3. The angular distance β is chosen such that the depth of the sawing groove UI in this cutting step is at least approximately the length of the steel edge 12a. The sawing groove UI is then expanded by the steel edge 12a of the machining member 11.

The operation of the blade head 7 according to the invention, in particular the rotary blade 8, the machining member 11 and the chisel blade 3, is illustrated by means of Figures 7 and 8. Then, the sawing groove U is re-machined into wood material P by the teeth 9 of each sector 40 of the circular blade 8. The machining member 11 in the middle of the sector 40 extends the sawing groove U1 the side of the sawing groove U1 as shown in FIG. The tip portion K of the chip piece P2 is thus bevelled. The resulting sawdust can be reached at this stage freely discharge cutting groove UI arrow E direction chipping side of the circular blade 8 and the työstöelintä 11. When the kerf U has been worked maksimisyvyyteensä 40 final stage of the circular blade 8 OVER AND sector, the chipping blade 3 detached from the wood material P wood chip piece P2, such as rubber 114 294 7 in Figure 8 is illustrated Fig. The chip P2, the tip portion has a bevelled surface V and the kerf U has been extended from the opening stage of the SU above-described Figure 7, wherein the sawdust to be discharged remains free to cut a groove U in the direction of the arrow F chipping side of the circular blade 8.

The invention is not limited solely to the above exemplary embodiment, but many modifications are possible within the scope of the inventive idea defined by the claims.

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Claims (6)

1. The cutter head cutter head (1; 7) having a frame (2), a plurality of chipping cutters (3) disposed circumferentially on the body and a circular cutter stand (4; 8) mounted adjacent to the body (2). ) in the vicinity of the chipping cutters (3), characterized in that the cutter head (7) has a processing means (11; 11 µl) arranged on each circular cutter sector (40) between the chipping cutters (3) and which processing cutter part ( 12) is arranged on the saw line of the circular cutter (8) and the width (TE) of the cutter part (12) in a plane perpendicular to the direction of rotation of the circular cutter (8) is greater than the width (T) of the circular cutter teeth (9) in the corresponding tab and the processing means (11) is arranged to cooperate with the circular cutter shaft (8) to at least partially extend the cutting bar (U) obtained in the wood (P) processed with the circular cutter shaft. The cutter head of the flat reducer according to claim 1, characterized in that on the cutter head (12) of the machining member (11) there is a cutting frame (12a) whose angle 15 (a) in relation to a transverse angle of the tile is between 0 ° - 75 °, preferably 45 °, and vinkein is particularly on the side of the chipping cutters, by means of which the opening edge (U) orifice (SU) of the cutter bar (U) is expanded. The cutter head of the flat reducer according to claim 1 or 2, characterized in that the processing means (11; ll, ll2) is preferably arranged in the middle region of each sector (40; 401, 402) at a suitable angular distance (β). from pre-existing chipping cutters (3; 3, 3). . 4. The cutter's cutter head according to any of the preceding claims, characterized in that the machining means (11) is adapted in connection with the round cutter shaft> (8). The cutter head of the flat reducer according to claim 4, characterized in that the working member (11) is formed as an additional stand for the circular cutter shaft (8). The cutter head cutter head according to claim 4 or 5, characterized in that the height (TK) of the working member (11) in the radial direction of the circular cutter (8) is greater than the height (hu) of the teeth of the circular cutter (9). '1 ·