JPH10119004A - Knife assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a knife assembly for a veneer lathe wherein production is simplified, cost is reduced and through hardening of the knife member can be employed. SOLUTION: This assembly includes a slender knife member 1 and a slender knife holder 3. The knife member 1 is provided with threaded holes 7 and the knife holder 3 includes a support 4 provided with a large number of set screw holes 6 to set a knife member 1 thereon. This assembly further includes a slender backup bar 2, which consists of one or more continuous parts and is provided with at least one line of threaded holes in the length direction for accepting setscrews. The backup bar can be removably fixed on the knife member, whereby at least one line of the threaded holes included in the backup bar 2 enables further adjustment of the knife member fixed on the backup bar 2 to compensate wear of the knife edge.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a knife assembly for a veneer lathe, said assembly comprising an elongated knife member and an elongated knife holder, the knife holder including a support member for placing the knife member thereon, the support member comprising: Comprises a number of set screw holes, which extend substantially transversely to the knife holder, extend through the knife holder and are spaced apart from each other along the length of the knife holder. The knife members are provided with respective threaded holes, these threaded holes are arranged in a substantially vertical row of knife members and are spaced apart from each other to receive set screws. Disposed and the knife member is laterally adjustable with respect to the knife holder by a set screw.

A prior art veneer lathe knife assembly includes an elongated knife member which is mounted on a prior art knife holder (or knife cap) 3 as shown, for example, in FIG.
It comprises a number of threaded set screw holes arranged in one or more longitudinal lines,
It extends through an elongated hole 6 contained in a knife holder, can be arranged in the length of the hole and can be fixed at a desired point in the length of the hole 6, whereby the knife of the knife member The edge can be adjusted with respect to the leading edge of the knife holder. Knife members of this type are generally surface hardened by induction hardening, or they are made of a softer material body member in which the threaded holes are formed, and a knife edge. It is composed of a composite structure (composite steel) including a hard material member. The problem with such a knife assembly is that
Due to its relatively high cost of manufacture, its complexity of manufacture, and the fact that veneer lathes are relatively long, for example having a length of 9 feet, and whose width is typically about 200 mm, It is heavy. SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved knife assembly for a veneer lathe, which simplifies manufacturing, reduces costs and, if necessary, allows for the through-hardening of the knife member. That is.

[0003] To this end, the knife assembly for veneer lathes of the present invention is characterized in that the knife assembly further comprises an elongated backup bar, the backup bar comprising one or more continuous parts. And at least a row of threaded holes in the longitudinal direction for receiving a set screw, said backup bar being removably securable to the knife member, whereby the backup bar is The included at least one row of threaded holes allows for further adjustment of the knife member secured to the backup bar to compensate for knife edge wear.

[0004] To significantly reduce the weight (25% in this example), the actual knife member can be reduced by using a backup bar, for example, to a typical width of 200 mm.
mm to a width of about 150 mm, which makes handling of the knife member easier. A further cost reduction is achieved because the backup bar can be used over the useful life of some knife members. Further, possible damage to the threaded holes contained in the backup bar can be repaired by replacing the backup bar with another backup bar. This is useful if the backup bar is 2
It is particularly noticeable without exception when it consists of two or more longitudinally continuous parts.

[0005]

DETAILED DESCRIPTION The present invention will now be described in more detail with reference to the accompanying drawings.

As depicted in FIG. 1, the knife assembly for a veneer lathe of the present invention includes an elongated knife member 1 and an elongated knife holder 3 of FIG. 5 for placing the knife member 1 thereon. Of the supporting member 4.
The support member 4 is provided with a number of set screw holes 6 which extend substantially transverse to the knife holder, extend through the knife holder and are spaced apart from one another in the length of the knife holder 3. It is placed open. The knife member 1 is provided with threaded holes 7 for receiving matching set screws, these threaded holes 7 being arranged in a row along the length of the knife member and spaced from one another. The knife holder 3 is provided at its rear end with a fastening member 5, which extends in the longitudinal direction of the knife holder and intersects the support member 4 and has a number of fastening screw holes 8. The fastening screw hole 8 extends laterally through the fastening member 5. On the other hand, the knife member 1 has a threaded hole 9a at its rear end for receiving a set screw. Further, the knife assembly of the present invention includes an elongate backup bar 2, which comprises one or more continuous portions, and in the illustrated embodiment, it receives two sets of longitudinal screws. It has a row of threaded holes 7. Backup bar 2 has hole 9
Member 1 by means of a fastening bolt 10 extending through
The hole 9 passes across the backup bar 2 and leads to a threaded hole 9 a at the rear end of the knife member 1. When fastened together, the knife holder 1 and the backup bar 2 are placed on top of the support member 4 of the knife holder 3 and the knife edge 11 extends through the adjustment hole 6 and is inserted into the threaded hole 7 By screw (not shown)
The knife holder 3 is adjusted to a desired position with respect to a front edge or a front end 12 thereof. When the adjustment is completed, the backup bar 2 together with the knife member 1 fixed thereto is fixed to the knife holder 3 by a fastening screw extending through a hole 8 included in the fastening member 5 of the knife holder 3. The knife holder can then be mounted on a veneer lathe with the backup bar and knife member secured thereto.

FIGS. 2 and 3 respectively show a cross section and a plan view of the knife member 1, and FIG. 4 shows a plan view of the backup bar 2. The knife member 1 has a single row of threaded holes 7 near the rear end of the knife member, the rear end of which has a transversely extending fixing hole 9a in the knife member, which fixing hole 9a connects the backup bar 2 to the knife member. It is for fixing to 1. The backup bar 2 is provided with a matching threaded hole 9 b extending in the lateral direction for fixing the backup bar to the fastening member 5 of the knife holder 3. The backup bar 2 has two rows of threaded holes 7 for receiving retaining screws. FIG. 5 depicts a prior art knife holder 3 that is compatible as is with the knife assembly of the present invention.

FIG. 6 shows a sectional view of the knife assembly of the present invention in the assembled state, in the case of a new knife member, and FIG. 7 shows what is adjusted with respect to the knife holder 3 by the hole 7 of FIG. If the wear continues, the knife member 1 must of course be reattached for another adjustment.

Specifically regarding the threaded holes,
The backup bar 2 is preferably hardened and annealed to improve its resistance.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a knife assembly of the present invention in cut-away view.

FIG. 2 is a sectional view of a knife member included in the knife assembly of the present invention.

FIG. 3 is a plan view of a knife member included in the knife assembly of the present invention.

FIG. 4 is a plan view of a backup bar included in the knife assembly of the present invention.

FIG. 5 is a cross-sectional view of a prior art knife holder used in the knife assembly of the present invention.

FIG. 6 is a cross-sectional view of the knife assembly of the present invention, wherein a backup bar is secured to the knife member;
It is a figure which shows what is put on the upper part of a knife holder.

FIG. 7 is a view similar to FIG. 6 in the case of a worn knife member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Knife member 2 Backup bar 3 Knife holder 4 Support member 6 Fastening screw hole 7 Threaded hole

Claims (3)

[Claims] 1. A knife assembly for a veneer lathe, said assembly comprising an elongated knife member (1) and an elongated knife holder (3), said knife holder (3) having said knife member thereon. A support member (4) for placing (1), said support member (4) being provided with a number of set screw holes (6), these set screw holes being substantially to the knife holder (3); Extending laterally, extending through the knife holder and being spaced apart from one another in the length of the knife holder, the knife member (1) is provided with a respective threaded hole (7). )
The threaded holes are arranged in a substantially longitudinal row of the knife member and are spaced apart from each other to receive a set screw, wherein the knife member (1) includes the set screw. By the knife holder (3)
Laterally adjustable with respect to the knife assembly, the knife assembly further includes an elongated backup bar (2), which comprises one or more continuous portions and receives a set screw. At least one row of threaded holes (7) in the longitudinal direction,
The backup bar can be removably secured to the knife member (1) so that the at least one row of threaded holes (7) contained in the backup bar (2) can be attached to the backup bar. Knife assembly characterized in that it allows further adjustment of said knife member (1), which is fixed thereto, to compensate for wear of the knife edge (11). 2. Knife assembly according to claim 1, wherein the knife member (1) is made of through-hardened steel. 3. Knife assembly according to claim 1, wherein the backup bar (2) is made from hardened and annealed steel.