Patent Application
20090260718
1. Field of the Invention
The present invention relates to a stable wood planing assembly of a veneer wood planing machine, more particularly to a wood planning assembly with a design of maintaining the stability for a process of planing a wood veneer, and having a groove disposed between knife shafts for allowing a material pressing shoe on a lateral side to be extended deeply to the center of the knife shafts to press the wood veneer, such that the wood veneer will not be pulled and shaken by the knife tools and the planing operation can be maintained stable, so as to maintain or enhance the planing quality.
2. Description of the Related Art
In general, a wooden floor or a skirting board of a wall is usually made of a wood veneer, and such wood veneer is made by cutting a whole piece of wood into wood veneers, and then polishing and producing the wood veneers.
However, most of such wood veneers are cut by a set of parallel saws at a time during the cutting process, and the two utmost external wood veneers and the middle wood veneer have a substantial error in thickness, and it is necessary to carry out an appropriate planing operation to assure a standard specification. To meet the requirements of the planing operation of such wood veneers, manufacturers developed a specific veneer wood planing machine.
In the structural design of a traditional veneer wood planing machine, the machine includes a knife shaft, a knife tool installed on the knife shaft, and a material pressing base disposed at a material feeding end of the knife shaft, such that when a conveyor belt is used for conveying the wood veneer in a direction towards the knife shaft to carry out a surface planing operation, the material pressing base can press the wood veneer appropriately, such that the wood veneer can be passed stably through the knife shaft to complete the planing operation successfully, and the bits produced by the planing operation will be discharged to the outside according to the curvature of the material pressing base, and a dust-collecting equipment is used for collecting the bits. With the aforementioned arrangement, the veneer wood planing machine of the invention is applicable for planing a wood veneer to meet a predetermined specification.
Although the structural design of such veneer wood planing machine can use the material pressing base to press the wood veneer appropriately, yet the material pressing base affects the planing operation of the knife tool, such that the pressing point of the material pressing base cannot be extended deeply into the contact point of the knife tool with the wood veneer, or extended even to ⅓ of the knife shaft. As a result, when the knife tool is in contact with the wood veneer during the planing process, the acting stress will pull the wood veneer and shake the wood veneer, and the planing stability will be affected seriously. Such arrangement not only causes damages to the knife tool easily, but also affects the planing quality or produces defectives. Obviously, the traditional veneer wood planing machine requires improvements.
In view of the shortcomings of the traditional veneer wood planing machine including the poor design of the material pressing base and the insufficient stability of the planing operation, the inventor of the present invention based on years of experience to conduct extensive researches and experiments, and finally developed a veneer wood planing machine in accordance with the present invention to overcome the shortcomings of the prior art.
Therefore, it is a primary objective of the present invention to provide a stable planing assembly with a structure design that allows a material pressing component to be extended deeply to the contact point of the knife tool with the wood veneer to prevent the wood veneer from being pulled and shaken by the knife tool during a planing operation, so as to maintain a stable planing operation and a good planing quality.
Another objective of the present invention is to provide a stable planing assembly with a structural design that a material pressing structure can be adjusted appropriately to cope with the thickness and specification of the wood veneer to achieve the best pressing effect and maintain a stable and smooth planing operation.
To achieve the foregoing objectives, the structural design of the invention comprises a machine platform, a pair of parallel knife shafts disposed on the machine platform, a plurality of grooves disposed equidistantly on each knife shaft, and the grooves of the two knife shafts being arranged alternately with each other, such that knives between the two knife shafts can achieve a comprehensive planing operation of the wood veneer to achieve the expected planing function, and a base is disposed on a material feeding side of each knife shaft, and the base includes a plurality of material pressing shoes disposed axially and corresponding to the grooves of the knife shaft, and each of the material pressing shoes has a curved surface corresponding to the groove of the knife shaft, and the front end of the material pressing shoe is extended beyond the center of the knife shaft, and the spring installed at a rear end of the material pressing shoe presses the material pressing shoe stably on the wood veneer, so that during a planing operation, the wood veneer will not be pulled and damaged by the knife tool, and each of the lateral sides of the material pressing shoe has a bit guide plate, and the bit guide plate has a curvature corresponding to the external diameter of the knife shaft, such that the bit produced in a planing operation can be discharged from a dust-collecting equipment to the outside by a central processing. With the stable wood planing assembly of a veneer wood planing machine of the invention, the planing quality and the stability of the wood veneer can be maintained.
To make it easier for our examiner to understand the objects, characteristics and effects of the present invention, we use preferred embodiments accompanied with related drawings for the detailed description of the present invention as follows:
Referring to
The two knife shafts 20, 20′ have a predetermined number of grooves 21, 21′ disposed equidistantly and concavely at external peripheries of the two knife shafts 20, 20′, such that the knife tools 23, 23′ can be installed between the protruding circular portion 22, 22′ of the groove 21, 21′ and the predetermined number of knife grooves, and the knife tools 23, 23′ of each protruding circular portion 22, 22′ are arranged in a spiral shape, and the grooves 21, 21′ of the two knife shafts 20, 20′ and the protruding circular portions 22, 22′ are installed alternately with each other. Meanwhile, the width of the grooves 21, 21′ is slightly smaller than the protruding circular portion 21, 22′, and the two knife shafts 20, 20′ are used for carrying out front and rear stages of planing to the wood veneer 1 to achieve a comprehensive planing effect on a surface of the wood veneer 1.
A base 30, 30′ is disposed separately on a material feeding side of each knife shaft 20, 20′, and each base 30, 30′ includes a slot 31, 31′ disposed at the corresponding groove 21, 21′ of the knife shaft 20, 20′, and penetrated through each slot 31, 31′ by an axle hole 32, 32′, and a material pressing shoe 40, 40′ is embedded in each slot 31, 31′, and pivotally coupled by a pivot bolt 33, 33′, for providing an appropriate pivotal swinging movement of the material pressing shoes 40, 40′, and a resilient element such as a spring 34, 34′ is installed to the rear end of each material pressing shoe 40, 40′ and a bottom plate of the base 30, 30′, such that the spring 34, 34′ can be used for pushing the rear portion of the material pressing shoe 40, 40′ to maintain the material pressing shoe 40, 40′ to be pressed onto the wood veneer 1, and an adjusting bolt 35, 35′ secured to the top of the base 30, 30′ is provided for adjusting the level of pressing the top of the rear end of the material pressing shoe 40, 40′ according to a different thickness of the wood veneer 1 in a planing operation.
The material pressing shoes 40, 40′ have a curved surface at the front side and corresponding to the groove 21, 21′ of the knife shaft 20, 20′, so that the front end can be extended beyond the central line of the knife shaft 20, 20′, and the slightly rear portion of the material pressing shoe 40, 40′ includes an axle hole 41, 41′ for pivotally coupling the base 30, 30′ by a pivot bolt 33, 33′. With the pushing action provided by the spring 34, 34′ installed between the protruding pillar 42, 42′ at a lower rear edge of the material pressing shoe 40, 40′ and the bottom plate of the base 30, 30′, the material pressing shoe 40, 40′ can press the wood veneer 1 stably.
A bit guide plate 50, 50′ is installed separately on both lateral sides of each material pressing shoe 40, 40′, and the thickness of the bit guide plates 50, 50′ is only equal to ½ of the width of the protruding circular portion 22, 22′ of the knife shaft 20, 20′, and the bit guide plates 50, 50′ have a curvature corresponding to the external diameter of the protruding circular portion 22, 22′ of the knife shaft 20, 20′ for guiding the bits produced by the knife tool 23, 23′ during the planing operation.
With the foregoing structural design, the design of the groove 21, 21′ of the knife shafts 20, 20′, the knife tools 23, 23′ can plane the wood veneer 1 in a discontinuous manner. With the design of the material pressing shoe 40, 40′, the pressing point of the material pressing shoe 40, 40′ to the wood veneer 1 can be extended deeply and beyond the contact point of the knife tools 23, 23′ with the wood veneer 1. Therefore, an instant force is produced when the knife tools 23, 23′ are in contact with the planed wood veneer 1, but the wood veneer 1 is pressed by the material pressing shoe 40, 40′ and will not be pulled by the knife tool 23, 23′. In the planing operation, the wood veneer 1 will not be shaken, and thus the invention can maintain a good planing quality and prevent the knife tools 23, 23′ from being damaged.
Therefore, the structural design of the present invention and the novel design of the knife shaft for separating the knife tools by the groove allow the wood veneer to be planed discontinuously. With knife tools of the front and rear sets of knife shafts installed alternately with each other, a comprehensive planing effect of the wood veneer can be achieved. With the grooves, the wood veneer can be pressed appropriately by the material pressing shoes and extended deeply beyond the planing contact point of the knife tool of the knife shaft with the wood veneer, without interfering the planing operation of the knife tool, so as to prevent the wood veneer from being pulled and shaken by the knife tool in the planing process. The invention provides a stable planing operation of the wood veneer by the knife tools of the knife shafts during the planing process, not only preventing the knife tool from being damaged, but also enhancing the planing quality and maintaining the stability.
In summation of the description above, the stable planing assembly of a veneer wood planing machine of the invention adopts the design of dual knife shafts disposed alternately with each other, not only achieving a comprehensive planing function of the wood veneer by extending the material pressing shoe deeply to the planing contact point of the knife tool and the wood veneer to maintain a sable planing operation and a good planing quality, but also overcoming the shortcomings of the prior art. Overall speaking, the invention is a novel design in compliance with the requirements of patent application and thus is duly filed for patent application.
