JPH077905U - Saw chain - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a saw chain that is durable and lasts sharply, while suppressing the occurrence of the downing wave phenomenon of the saw chain of the chain saw, smoothing the rotation of the saw chain. [Structure] The legs of the center link are horizontally cut to have short legs, and the length of the legs is relatively configured to be in contact with the bottom of the rail groove of the guide bar. A cemented carbide tip is attached to the edge of the cut foot in the direction of travel to make the foot stronger than the foot, and the saw chain cutter is leveled, and the saw chain cutter is used as the mother body. It is proposed to cover the mold with a blade-shaped replacement blade cutter, or to provide a removable blade cutter that can be attached and detached with a screw or the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a saw chain (chain blade) of a chainsaw.

[0002]

[Prior art]

 The engine chain saw transmits the rotational drive from the engine to the saw chain (chain blade) with a sprocket, the saw chain rotates along the rail groove track of the guide bar, and the cutter provided on the outer periphery of the saw chain cuts trees and It is the work of root cutting in the soil. As shown in FIGS. 2 to 4, a conventional chain saw is performed by rotating a saw chain 4 in which a cutter 1 is connected by a center link (drive link) 2 and a side link 3, and the drive thereof is performed by a star or a star. The sprocket 5 is rotated by being bitten by the rim type sprocket 5 and guided by the rail groove 11 of the guide bar 6 to rotate. The structure of the saw chain is as follows.

“Conventional guide bar” The depth of the rail groove 11 of the guide bar 6 is standardized to be twice the foot length so as not to come into contact with the foot of the center link 2 of the saw chain 4 as shown in FIG. Had changed.

“Conventional Saw Chain” There was a saw 1 of a root-cutting saw with a carbide tip 9 brazed to the cutter 1. The cutter 1 had a taper on its upper end that descended downward mainly for cutting wood. In order to remove the sediment accumulated in the bottom of the rail groove 11 of the guide bar 6 of the root cutting chain saw, 2 to 1 out of the total number of the center links 2 in one circumference of the chain are cut off with a saw blade. There was a saw chain 4 to which a sharp carbide tip 10 was attached by the embedding technique.

[0005]

[Problems to be solved by the device]

 The engine chainsaw in which the above-mentioned components are combined has the following problems. First, a new saw chain 4 is instructed to make constant adjustments every few minutes until it becomes familiar. This is because it corresponds to the elongation of the saw chain 4, and this elongation suddenly occurs at the beginning of use and gradually stabilizes. This familiarity is unique to each product, and if it is not familiar, seizure of the saw chain 4 and disturbance of running will occur, leading to horsepower loss and abnormal wear of the guide bar 6. In particular, the saw chain 4 is rotated at high speed due to the strengthening of the engine, but a pitch difference with the sprocket 5 occurs due to the extension of the saw chain 4, so various problems have arisen depending on the compatibility.

[Problems of Saw Chain Stable Running] (a) When the saw chain 4 is separated from the sprocket 5 due to the high rotation of the chain saw, the dowing wave phenomenon (the dowing wave phenomenon is caused by the saw chain 4 and the sprocket 5). Phenomenon of waving in the direction of rotation as shown by arrow A in Fig. 3 due to friction and inertial force with the sprocket 5 due to self-rotation during biting with and due to elongation of the saw chain, especially when the saw chain bites out. Although the elephant has not been regarded as a problem in the chain saw field in the past, the applicant of the present invention = the inventor made it an important technical problem.) Due to this phenomenon, the surface of the sprocket 5 and the lower edges of the links 2 and 3 of the saw chain 4, such as C in the figure, are worn or damaged, and relatively smooth running is hindered. (B) Next, as the chain saw is used, the saw chain 4 expands, causing a slight difference in the pitch with the sprocket 5, making it impossible to bite and causing the saw chain 4 to come off the guide bar 6. It was the cause. The elongation of the saw chain 4 suddenly occurs within a few hours of use from the time of new product, and then becomes gentle. For this reason, in a chainsaw with strong horsepower, a downing wave phenomenon occurs due to the pitch difference that occurred during this break-in operation, the center link 2 was hit and the side link 3 was damaged, and the transition to the guide bar 6 and its There was a problem in running on the track. (C) In order to prevent this disengagement, the length of the foot of the center link 2 is increased as shown in FIG. 4, and the depth of the rail groove 11 of the guide bar 6 is adjusted to match the length of the foot. It was doubled. However, with this configuration, there is a high risk that foreign matter will collect in the rail groove 11, and the foot portion will wear due to contact with the foreign matter, so it was necessary to inject excess oil. Moreover, the saw chain 4 became heavy and promoted the downing wave phenomenon. (D) In order to prevent the wear of the foot portion, there is one in which the cemented carbide tip 10 is embedded at the tip of the foot portion of the center link 2 as described above. When the link 3 wears, the foot further penetrates deeply, and the friction with foreign matter on the one hand increases bite resistance, which eventually causes excessive friction and necessitates refueling.

[Problems of Saw Chain] (e) With a root-cutting chain saw, the cutter 1 of the saw chain 4 hits stones or other hard foreign matter because the work is often performed in the soil, and the tip of the cutter 1 is hit by the collision. There is a possibility of chipping or chipping of the carbide tip 9 as described above, and there has been a demand for improving the durability of the cutter 1.

[0008]

[Means for solving problems]

 The present invention solves the above problems. A first object of the present invention is to make the saw chain 4 contact with the sprocket 5 with the cutter 1 and the side link 2 so that the down wave phenomenon does not occur as much as possible. An object is to provide a structure that prevents wear and ensures stable running of the saw chain 4. The second purpose is to make the rail groove 11 of the guide bar 6 have a shallow structure in which dirt or the like does not easily enter, prevent the saw chain 4 from being worn, and allow the saw chain 4 to rotate smoothly. The third purpose is to make the cutter 1 of the saw chain 4 less likely to be damaged by earth and sand, etc., and to allow the center link 2, side link 3, etc. to contact the sprocket 5 in relation to the replaceable rim sprocket and to guide it. Another object of the present invention is to provide a highly durable saw chain 4 that does not come into contact with foreign matter in the rail groove 11 of the bar 6 to cause abrasion or damage. And as a whole, the goal is to develop a chainsaw that is durable and durable.

The present invention comprises a center link having a short leg such as a horizontal cut of the center link leg, and the length of the leg is in contact with the groove bottom of the guide bar rail groove. To provide a saw chain with a sufficient degree. A center-cut lower part of the center link with horizontal foot cuts will be provided at several places. Further, a structure is proposed in which the lower part of the center link is cut horizontally, and a carbide tip material is attached to the edge of the cut foot in the direction of travel in a shorter length than the foot. Furthermore, the traveling direction of the center link of the saw chain and the lower part of the center link are cut horizontally, and the increase / decrease in running wear for each center link is adjusted by the cut amount and the tip welding amount to cushion the saw chain itself. I also propose the one with the function. Regarding the improvement of the cutter, we propose a cutter with a saw chain as the base material, a similar type of bag-shaped replacement blade covered with it, or a removable blade type cutter that can be detached with screws. We also propose a cutter that has been strengthened as an upper horizontal structure by eliminating the back-down taper of the cutter, and a saw chain that has a flat plate for carrying sediment attached to several cutters depending on the application with the flat surface facing the direction of travel.

Next, one embodiment of a saw chain according to the present invention will be described with reference to the drawings. The saw chain 4 is improved for the purpose of smooth rotation and good cutting without biting in dirt and the like. First, the chain 20 is formed by cutting the foot 20 of the center link 2 of the saw chain 4 horizontally. In FIG. 1 showing an embodiment, the left side of the chain double-dashed line is a conventional chain, and the center link 2 has an actual height of 15 mm and a sharpened lower end. The right side of the chain double-dashed line in FIG. 1 relates to an improvement of the present invention, and the foot portion 20 is cut to form a short short leg of about 11 mm. This short-legged center link 2 is also extremely important in terms of weight reduction, and this weight reduction can suppress the down wave phenomenon of the saw chain 4. Since the rotation of the sprocket 5 is a circular motion, the rotation of the foot portion 20 of the center link 2 on the inner side is slow and that of the upper portion of the cutter 1 on the outer side is fast. Therefore, especially when the saw chain 4 runs in a circular curve, the center link 2 also exerts its own weight to provide a downward braking action, the saw chain 4 is pulled downward, and is guided by the guide bar 6 to cause a wavy shape. Movement occurs. Therefore, by making the center link 2 lightweight, the downward force is weakened, and the amplification of this phenomenon can be suppressed. The center link 2 can be made lighter by cutting the legs, thinning it, and making holes. The short leg 20 of the center link 2 contacts the shallow groove bottom of the rail groove 11 of the guide bar 6 and slides as shown in FIG.

Further, the lower part of the center link 2 of the saw chain 4 is horizontally cut, and the cemented carbide chip processing material 24 is attached to the edge of the cut foot portion 20 in the traveling direction with a length shorter than the foot portion 20. 4 is also provided. In this configuration, the length of the cemented carbide tip 24 is shortened in anticipation that the foot portion 20 of the center link 2 will be worn in advance. Further, the edge of the saw chain 4 in the traveling direction of the center link 2 is cut out to form a dodroma space 25.

Further, when cutting the lower part of the center link 2 horizontally, a large number of cuts and a slightly longer one are created and connected, and the increase or decrease in running wear is determined by the cut amount and the welding amount of chips 24 such as stellite. It is also proposed to adjust the structure so that the saw chain 4 itself has a cushioning or adjusting function. By adjusting this wear, a cushioning action can be expected when the cutter 1 hits a stone or the like. To explain with reference to Fig. 1, when the chain cutter 1 that is rotating with tension is impacted by a stone or the like from E in the figure, the center link 2 that has a larger amount of cut than the front and rear center links 2 or is lightweight There is a phenomenon of floating from the groove bottom of the groove 11. This provides a cushioning action against the impact of cutting work. It should be noted that the lower part of the center link 2 is cut horizontally, and some of the center links 4 are provided with a slightly long leg or thick wall so that it can be used for removing earth and sand. In the present invention, the center link 2 comes into contact with the rail groove 11 as shown in FIG. 5, so the center link 2 is appropriately treated according to strength requirements such as quenching.

Next, the following improvements are added to improve the impact resistance of the saw chain 4 and improve the sharpness. First, in the root-cutting chain saw, a saw chain 4 provided with the cutter 1 having an upper horizontal structure without the taper of the cutter 1 is proposed. When the back-down taper surface of the conventional cutter 1 shown on the left side of FIG. 1 is welded so that the cemented carbide tip 26 has a wedge-shaped reverse taper thickness so as to be nearly horizontal, the upper surface of the cutter is similar to that of the cutter 1 on the right side of FIG. It becomes nearly horizontal and the taper angle is close to the depth gauge difference, and the cutter strength is greatly increased. When the cutter 1 passes through the cut object due to the lack of backfall of the cutter 1, the corner at the end of the cutter also plays the role of the depth of the next cutter 1 and prevents the shock caused by excessive cutting due to wear of the depth gauge during root cutting. . With this configuration, it is possible to prevent the cutter 1 from hitting stones during work, and even if a part of the cutter is cut off, the horizontal upper end remains as a residual blade, so this residual blade can be used as a reproduction blade and sharpness can be improved. Persists. Further, since the upper end is a horizontal blade (the embodiment on the right side in FIG. 1), the saw chain 4 can be cut even if the rotation direction is reversed and the sprocket 5 and the guide bar 6 are loaded. It is possible.

Further, the cutter 1 tooth of the saw chain 4 is used as a mother body, and a replaceable blade type cover 27 of a similar type is covered and fixed with a wedge 28 or an adhesive or detachable with a screw or the like. We propose a configuration that includes. By using a replaceable blade type cutter, when the saw chain 4 itself or the cutter 1 itself is damaged, it is economical to replace only that portion. As the replaceable blade type, for example, a similar type of bag-shaped one fitted on the cutter 1 or a replaceable blade type cutter in which the depth gauge is integrally covered is proposed. As shown in Fig. 7, the replaceable blade type that integrally covers even the depth gauge has a more reliable depth gauge action and is more robust. Further, in the root cutting chain, a saw chain 4 in which a flat plate 29 for carrying earth and sand (a plate facing in the traveling direction as shown by the phantom line in FIG. 7) is attached to several cutters 1 is also proposed.

[0015]

[Effect of device]

 As described above, the saw chain of the chain saw according to the present invention is useful for preventing the down waving phenomenon in relation to other components, and provides a saw chain having several steps improved in durability and strength. be able to. Then, there are the following unique technical effects. The dowing wave phenomenon does not occur, wear and damage are small, and smooth running of the saw chain is possible. Since there is no clearance for foreign matter to collect in the rail groove of the saw chain, the wear of the center link foot due to contact with foreign matter such as earth and sand is small, and it is not necessary to inject extra oil. The tip of the center link has a cushioning effect when the tip is welded to its lower end, and the tip welding point is formed at the edge of the traveling direction to be shorter than the foot to protect the foot. It forms the Doromari. Since the cutter is a replaceable blade type or has a horizontal wall thickness, the durability is significantly improved. Especially, replaceable blade saw chains have an unprecedented idea and are highly economical. Since the blade of the cutter is horizontal rather than slanted, it is strong in strength and easy to recreate, and in some cases it can be loaded and used by reversing the direction of rotation.

[Brief description of drawings]

FIG. 1 is a partial side view of a saw chain, in which the left side of the chain double-dashed line is a conventional saw chain and the right side is a partial side view showing an embodiment of the saw chain according to the present invention.

FIG. 2 is a side view of a conventional chainsaw.

FIG. 3 is a partial side view showing the engagement between a conventional sprocket and a chain.

FIG. 4 is a vertical sectional view of a conventional guide bar.

FIG. 5 is a vertical cross-sectional view of the guide bar.

FIG. 6 is a partial perspective view of a cutter.

FIG. 7 is a partial perspective view of a cutter.

[Explanation of symbols]

 1 Cutter 2 Center Link 20 Center Link Foot 3 Side Link 4 Saw Chain 5 Sprocket 6 Guide Bar 8 Chain Guide 11 Rail Groove 13 Chain Guide Rail Groove 24 Tip 25 Dorodmari 26 Tip 27 Spare Blade 28 Wedge 29 Flat Plate

Claims (7)

[Scope of utility model registration request] 1. A saw chain comprising a center link having short legs such as by cutting the legs of the center link horizontally, the length of the legs being in contact with the bottom of the rail groove of the guide bar. 2. A saw chain in which a lower part of a center link of the saw chain is horizontally cut, and a chain having a foot-length center link for removing sand is provided at several places. 3. A saw chain in which a lower portion of a center link is horizontally cut, and a cemented carbide material is attached to an edge of the cut foot portion in a traveling direction with a length shorter than that of the foot portion. 4. The saw chain itself by cutting the traveling direction of the center link of the saw chain and the lower part of the center link horizontally, and adjusting the increase / decrease in running wear for each center link by the cut amount and tip welding amount. Saw chain with a structure that has a buffer adjustment function on the. 5. A saw chain having a cutter of a saw chain as a mother body and a replaceable blade type cutter that is detachable with a similar bag shape or a screw or the like. 6. A saw chain provided with a cutter having a horizontal structure of an upper portion, which eliminates the downward taper of the cutter. 7. A saw chain in which flat plates for carrying earth and sand are attached to a plurality of cutters with their planes facing in the traveling direction.