ES2370031B1 - UNIT OF MOBILE KNIVES FOR WOOD CUTTING MACHINE - Google Patents

Abstract

Mobile knife unit for wood cutting machine. # A mobile knife unit (33) for a wood cutting machine is mounted on the rotation axis (31) of the wood cutting machine and includes a blade and a inner ring (23) that is disposed between the blade and the axis of rotation (31). A movable ring (20) is connected to the movable knife unit (33), and includes a flange (21), an outer ring (22) and the inner ring (23), in which the flange (21) is connected to the outer ring (22) which is rotatably connected to the inner ring (23). The inner ring (23) is mounted on the axis of rotation (31) and a space is defined between the inner ring (23) and the axis of rotation (31). The inner ring (23) includes multiple groups of turning elements (40) that are in contact with the grooves (311) of the rotating shaft (31) so that the inner ring (23) can rotate and move relative to the axis of turn (31) with little or reduced friction.

Description

Unit of mobile blades for wood cutting machine.

Background of the invention Field of the invention

The present invention relates to a mobile knife unit of a wood cutting machine, and more specifically, to a mobile knife unit that can move smoothly along the axis of rotation with less friction.

Description of the prior art

A conventional wood cutting machine includes an axis to which several blades are mounted to cut the wooden object into multiple parts. The distance between the blades can be regulated. A mobile knife unit is arranged to meet different cutting requirements and the blade in the mobile knife unit can avoid knots of the wooden object or cut along the sides of the wooden object to obtain maximum use of the object of wood.

A conventional wood cutting machine is shown in Figures 1 to 3 and, in general, includes an axis 10 and a rotation axis 11 is connected to axis 10, multiple blades 12 are mounted on the rotation axis 11 using a positioning ring 13, which is mounted on the axis of rotation 11. A hydraulic expansion mechanism in the axis of rotation 11 firmly places the positioning ring 13 so that the blades 12 and the positioning ring 13 rotate together with the axis of rotation 11. Some machines can directly fix the blades 12 to the axis of rotation 11.

The rotation axis 11 has at least one movable blade 16 that is connected to a movable ring 17. Said at least one movable blade 16 and the movable ring 17 are arranged with another positioning ring 161 which is made of bronze and copper. and has multiple grooves for coupling to transmission keys 15 on the rotation axis 11. The positioning ring 161 is directly in contact with the rotation axis 11 and can move axially along the rotation axis 11 by moving the movable ring 17. The mobile ring 17 has a flange 171 radially connected thereto and between the flange 171 and the positioning ring 161 a bearing 172 is located. Users can move the flange 171 to move the positioning ring 17. A support 173 It is connected to flange 171 and a measuring unit is used to detect the distance that support 173 travels.

Said at least one movable blade 16 is moved at a desired distance by actuating the flange 171 and the support 173 is then placed in the desired position. Said at least one movable blade 16 is then fixed and ready to cut.

The positioning ring 161 and the axis of rotation 11 must precisely coincide with each other, while the positioning ring 161 must be able to move smoothly on the axis of rotation 11. Therefore, the positioning ring 161 must be of bronze, which is expensive. Contact friction between the positioning ring 161 and the rotation axis 11 wears both and increases the space between the positioning ring 161 and the rotation axis 11. Dust from the wooden object can easily enter the wood object preventing the displacement of the moving ring 17.

There are several obvious drawbacks to the conventional mobile ring 17. The space between the positioning ring 161 and the rotation axis 11, the machining precision for the positioning ring made of bronze 161 is costly, and the wear of the positioning ring 161 reduces the duration of the positioning ring 161.

The present invention aims to provide a mobile knife unit for wood cutting machines, in which the drawbacks of the conventional mobile ring are overcome. Summary Description of the Invention

The present invention relates to a mobile knife unit for wood cutting machines, and the knife unit comprises an axis having a rotation axis that includes multiple axially defined grooves therein. Multiple first blades are connected to at least one of a first positioning ring that is mounted on the axis of rotation. A mobile blade unit is mounted on the axis of rotation and includes a second blade and an inner ring that is located between the second blade and the axis of rotation. A mobile ring is connected to the mobile blade unit and has a flange, an outer ring and the inner ring. The flange is connected to the outer ring that is rotatably connected to the inner ring by means of a bearing. The inner ring is mounted on the axis of rotation and a space is defined between the inner ring and the axis of rotation. Multiple groups of turning elements are connected to an inner periphery of the inner ring and in contact with the grooves of the rotating shaft.

The main objective of the present invention is to provide a mobile knife unit for a wood cutting machine, in which the inner ring of the mobile knife unit makes contact with the axis of rotation through one bearings located in the grooves axial, thus reducing friction.

Another object of the present invention is to provide a mobile knife unit for a wood cutting machine, in which the inner ring of the mobile knife unit includes a fan blade impeller that induces an air fl ow and therefore , blow the dust out of the inner ring and axial grooves during operation.

Still another objective of the present invention is to provide a mobile knife unit for a wood cutting machine, in which the mobile knife unit is easily manufactured and maintained at a lower cost.

The present invention will be clearer from the following description when considering it with the accompanying drawings which show, for illustrative purposes only, a preferred embodiment in accordance with the present invention. Brief description of the drawings

Figure 1 is a perspective view showing the conventional mobile knife unit of a wood cutting machine;

Figure 2 is a partial cross-sectional view showing the conventional mobile knife unit of a wood cutting machine;

Figure 3 is a front view showing the moving ring of the conventional mobile knife unit of a wood cutting machine;

Figure 4 is a perspective view showing the mobile knife unit of a wood cutting machine of the present invention;

Figure 5 is a perspective view showing the inner ring of the mobile knife unit of the present invention;

Figure 6 is a partial cross-sectional view showing the relationship of the axis of rotation and the inner ring of the present invention, and

Figure 7 is a view showing the mobile knife unit of a wood cutting machine of the present invention. Detailed description of preferred embodiments

Referring to FIGURES 4 to 7, the knife unit for a wood machine of the present invention comprises an axis 30 which is a rotation axis 31 driven by a motor (not shown) and multiple grooves 311 are axially defined therein. In this embodiment, there are four slots 311 and each slot 311 is a substantially U-shaped slot and includes two edges 312.

Multiple first blades 32 are connected to at least one first positioning ring 34 that is mounted on the rotation axis 31. The rotation axis 31 includes a screw mechanism (not shown) that positions the first positioning ring 34 of so that the first blades 32 and the first positioning ring 34 rotate together with the axis of rotation 31.

A mobile blade unit 33 is mounted on the rotation shaft 31, and includes a second blade 331 and an inner ring 23, which is disposed between the second blade 331 and the rotation shaft 31. The mobile blade unit 33 is connected to the inner ring 23 by means of a second positioning ring 332 and the inner ring 23 is mounted on the axis of rotation

31.

A movable ring 20 is connected to the movable knife unit 33 and has a flange 21, an outer ring 22 and the inner ring 23. The flange 21 is connected to connecting elements 221 of the outer ring 22, which is connected so rotating to the inner ring 23. A piston 24 is connected to the flange 21 and the wood cutting machine includes a measuring unit (not shown), which can detect the distance the piston travels 24. A bearing 25 is arranged between outer ring 22 and inner ring 23 as shown in the figure

7. The inner ring 23 and the second positioning ring 332 move and rotate simultaneously. The inner ring 23 is mounted on the rotation axis 31 and a space is defined between the inner ring 32 and the rotation axis 31. Multiple groups of turning elements 40 (the minimum is 8) are connected to an inner periphery of the ring inside 23 and in contact with the grooves 311 in the rotation axis 31. In this embodiment, there are eight groups of turning elements 40 connected to the inner periphery of the inner ring 23 and each group includes two rotating parts. In the same way, the axis of rotation 31 includes four slots 311.

The inner periphery of the inner ring 23 includes four flat surfaces 231 that are located at equal intervals. Each flat surface 231 includes a column 232 extending therefrom which is perpendicular to the flat surface 231. Each column 232 has a Nylatron bearing 233 mounted therein and the turning elements 40 are mounted to the Nylatron bearings 233 in columns 232, respectively, and can rotate around the edges 312 of the slots 311. In this embodiment, each of the turning elements 40 is a bearing. It should be noted that the inner periphery of the inner ring 23 is not directly in contact with the axis of rotation 31 and to the outside of the inner ring 23 multiple fan blades are connected

26. The fan blades 26 rotate as the rotation axis 31 rotates to generate an air fl ow to blow the dust during operation of the wood cutting machine.

In operation, the user moves the lever 24 to push the flange 21 which moves the movable ring 20 so that the movable knife unit 33 moves with the movable ring 20 to a desired position. The user arranges the lever 24 and sets the mobile knife unit 33. The first blades 32 and the second blades 331 rotate together with the axis of rotation 31.

The rotation shaft 31 drives the first positioning ring 34 which rotates the first blades 32 and the rotation axis 31 simultaneously drives the mobile blade unit 33 to rotate the second blade 331. Due to the bearing 25 located between the outer ring 22 of the inner ring 23, and the restriction of the lever 24, the outer ring 22 does not rotate with the axis of rotation 31.

The turning elements 40 roll on the edges 312 of the groove 311 so that the inner ring 23 can move smoothly along the turning axis 31. In other words, the moving ring 20 gently moves the moving knife unit 33. Due to the relatively large space between the inner ring 23 and the axis of rotation 31, there is no friction between them. The turning elements 40 are easy to maintain and they do not need to be manufactured accurately. Once these have been placed, the mobile knife unit 33 can be started and operated with precision. The fan blades 26 expel the dust during cutting of wooden objects to maintain smooth movement of the mobile knife unit 33.

Although the embodiment according to the present invention has been shown and described, it should be clear to those skilled in the art that other embodiments may exist without departing from the scope of the present invention.

Claims (10)

1. Blade unit for wood cutting machine, comprising: an axis (30) which is a rotation axis (31); multiple first blades (32) connected to at least a first positioning ring (34) that is mounted on the axis of rotation (31), also including the axis of rotation (31) multiple grooves (311) axially defined therein ; a mobile blade unit (33) mounted on the pivot shaft (31) and that includes a second blade (331) and an inner ring (23) which is located between the second blade (331) and the axis of rotation (31), and a mobile ring (20) connected to the mobile blade unit (33) and having a flange (21), an outer ring (22) and the inner ring (23), the flange (21) connected to the outer ring (22 ) which is rotatably connected to the inner ring (23), the inner ring (23) mounted on the axis of rotation (31) and a defined space between the inner ring (23) and the axis of rotation (31), multiple groups of turning elements (40) connected to an inner periphery of the inner ring (23) and being in contact with the grooves (311) of the axis of rotation (31). 2. Mobile blade unit according to claim 1, characterized in that four groups of turning elements (40) are connected to the inner periphery and the inner ring (23) of each group includes two rotating parts, the axis of Turn (31) includes four slots (311). 3. Mobile blade unit according to claim 2, characterized in that the inner periphery of the inner ring (23) includes four flat surfaces (231) that are located at equal intervals, each flat surface (231) includes a column

(232)

extending from it that is perpendicular to the flat surface (231), in the columns

(232)

Nylatron bearings (233) are mounted and the turning elements (40) are mounted on Nylatron bearings (233).

Four.

Mobile blade unit according to claim 1, characterized in that each of the turning elements (40) is a bearing.

5.

Mobile blade unit according to claim 1, characterized in that each of the grooves (311) is a substantially U-shaped groove and includes two edges (312) to which the turning element (40) contacts .

6.

Mobile blade unit according to claim 1, characterized in that the inner ring (23) is connected to a second positioning ring (332) of the mobile blade unit (33).

7.

Mobile blade unit according to claim 1, characterized in that a bearing (25) is located between the outer ring

(22) and the inner ring (23). 8. Mobile blade unit according to claim 1, characterized in that the flange (21) is connected to a lever (24). 9. Mobile blade unit according to claim 1, characterized in that multiple fan blades (26) are connected outside the inner ring (23). SPANISH OFFICE OF THE PATENTS AND BRAND Application no .: 200900993 SPAIN Date of submission of the application: 08.04.2009 Priority Date: REPORT ON THE STATE OF THE TECHNIQUE 51 Int. Cl.: B27B5 / 34 (2006.01) RELEVANT DOCUMENTS

Category

Documents cited Claims Affected

Y

US 2337854 A (PRICE PERCY) 12/28/1943, Page 2; 1,2,4-8

figures 1-3

Y

US 2003019545 A1 (WOODFORD JAMES ET AL) 01/30/2003, 1,2,4-8

Pages 3-4; figures 6-9

TO

US 5325751 A (GREEN MAX ET AL) 07/05/2005, Columns one

2-5; figures 1-8

TO

US 5293798 A (OTANI KAZUHIRO ET AL) 03/15/1994, one

Columns 6-7; figures 14-20

TO

US 5632189 A (LARSON WILLIAM) 05/27/1997, Columns one

5-6; figure 4-6

Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application

This report has been prepared • for all claims • for claims no:

Date of realization of the report 15.11.2011

Examiner J. Hernández Cerdán Page 1/4

REPORT OF THE STATE OF THE TECHNIQUE Application number: 200900993 Minimum documentation sought (classification system followed by classification symbols) B27B Electronic databases consulted during the search (name of the database and, if possible, terms of search used) INVENES, EPODOC State of the Art Report Page 2/4  WRITTEN OPINION Application number: 200900993 Date of Written Opinion: 15.11.2011 Statement

Novelty (Art. 6.1 LP 11/1986)

Claims Claims 1-9 IF NOT

Inventive activity (Art. 8.1 LP11 / 1986)

Claims Claims 3.9 1.2, 4-8 IF NOT

The application is considered to comply with the industrial application requirement. This requirement was evaluated during the formal and technical examination phase of the application (Article 31.2 Law 11/1986).  Opinion Base.- This opinion has been made on the basis of the patent application as published. State of the Art Report Page 3/4  WRITTEN OPINION Application number: 200900993 1. Documents considered.- The documents belonging to the state of the art taken into consideration for the realization of this opinion are listed below.

Document

Publication or Identification Number publication date

D01

US 2337854 A (PRICE PERCY) 28.12.1943

D02

US 2003019545 A1 (WOODFORD JAMES et al) 01/30/2003

D03

US 5325751 A (GREEN MAX et al) 05.07.2005

D04

US 5293798 A (OTANI KAZUHIRO et al) 03.15.1994

D05

US 5632189 A (LARSON WILLIAM) 05/27/1997

2. Statement motivated according to articles 29.6 and 29.7 of the Regulations for the execution of Law 11/1986, of March 20, on Patents on novelty and inventive activity; quotes and explanations in support of this statement The invention in its first claim describes a knife unit for wood cutting machine, comprising: an axis (30), which is a rotation axis (31); multiple first blades (32) connected to at least a first positioning ring (34) that is mounted on the axis of rotation (31), also including the axis of rotation (31) multiple grooves (311) axially defined therein a mobile knife unit (33) mounted on the rotation axis (31) and which includes a second blade (331) and an inner ring (23) which is located between the second blade (331) and the axis of rotation (31), and a movable ring (20) connected to the mobile knife unit (33) and having a flange (21), an outer ring (22) and the inner ring (23), the flange (21) connected to the outer ring (22) which is rotatably connected to the inner ring (23), the inner ring (23) mounted on the axis of rotation (31) and a defined space between the inner ring (23) and the axis of rotation (31), multiple groups of elements of rotation (40) connected to an inner periphery of the inner ring (23) and being in contact with the grooves (311) of the rotation axis (31) The second claim highlights the possibility that the four groups of turning elements (40 ) are connected to the inner periphery and the inner ring (23) of each group includes two rotating parts, the axis of rotation (31) includes four slots (311). In the fourth claim it is specified in the possibility that these turning elements are bearings. Claims 4-8 reflect only some particular conditions under which the procedure described in the first and second claims can be performed. Document D01, considered as the closest to the invention, describes a mobile ring for a wood cutting machine that is mounted on the axis of rotation (1), wherein multiple rotation elements connected to the inner periphery of the inner ring they are connected to the grooves (2) of the axis of rotation (1). The turning elements will support the moving ring during longitudinal displacements, while contributing to the rotation of the ring around the axis of rotation (1). Document D02 shows a wood cutting machine with multiple moving blades mounted around a rotation axis. A mobile ring is connected to the mobile knife unit and has a flange (110) that is connected to connecting elements of the outer ring, which is rotatably connected to an inner ring. A bearing (132) is disposed between the inner ring and the axis of rotation. The documents cited D03-D05 provide general regulation or fixing devices for circular saws on the axis of rotation of wood cutting machines. In none of them the technical characteristics are so relevant as to anticipate the technical aspects claimed by the invention studied; they are cited only for illustrative purposes of the State of the Art. In the light of documents D01 and D02 it can be considered that the object of claims 1-2 and 4-8 does not imply inventive activity (Art 8.1, LP11 / 86). State of the Art Report Page 4/4