JPS62105602A - Saw chain - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a saw chain used in a chain saw or the like.

[Background of the invention]

BACKGROUND ART Conventionally, when cutting wood or the like, the cutting blade has caused excessive biting, causing various problems. There are two ways in which excessive jamming occurs: when it occurs on the flat part of the saw bar, and when it occurs on the arcuate part of the saw bar. In the former case, as disclosed in Japanese Patent Publication No. 57-30042, the force applied to the cutting edge of the cutting blade is transmitted to the bottom edge of the cutting blade and the depth of cut adjustment gauge is This is because the cutting blade does not adequately regulate the surface cut, resulting in excessive biting and the bottom edge of the cutting blade hitting the sawer violently.As a result, vibration is transmitted to the human body and causes vibration problems. Cause.

In the latter case, known as a kickback phenomenon, the chainsaw body bounces back onto the worker, resulting in injury to the worker.

Therefore, the simplest countermeasure is to narrow the set width B without changing the depth of cut, that is, without changing the cutting speed.
The purpose is to reduce the load on the saw chain. As shown in Fig. 7, in the case of a cutter-like structure in which part of the link has a cutting edge y, which is formed later, the cutter itself is subjected to the load during cutting, and the thickness necessary for strength is ensured. It must be cutter-like and must be made of thick board. Therefore, by integrating the cutting blade with the drive link l as shown in Figure 8, the side link blades do not receive the load directly during cutting, making it possible to change to a thinner plate. The clam width can be made narrower, reducing the load and increasing the effectiveness. However, the over-biting phenomenon itself still remains, although it has been reduced by about 20%, and is not an essential solution. The prevention plan for Sober's flat section was published in 1986-30.
There is No. 042. Although the effect is recognized, the cutter is in partial contact with the saw bar or not at all, so considering that the saw chain moves on the cutting surface of the wood,
It is conceivable that forces in various directions are applied to the depth of cut adjustment gauge, and rotational moment is received each time, causing the depth of cut to be unstable. It prevents jamming that occurs on the semicircle of the sawbar's tip arc, but it is only effective on sawbars with sprockets and is not versatile. An even bigger drawback is that the tip depth gauge for adjusting the depth of cut is located further forward in the direction of saw chain travel than the front lip of the cutting element, whether on the flat or arcuate part of the saw bar, and is not protected in any way. If force is applied to the tip depth gauge from above, the front lipets will be centered and the rear teeth will rise endlessly, increasing the depth of cut and causing excessive biting.

Although the configuration is different, there is an example in which three depth gauges of approximately the same height are arranged side by side, as seen in Japanese Patent Publication No. 59-20442. The purpose of the arc is to increase the contact surface of the depth gauge with the wood, reduce sinking, and keep the depth of cut as constant as possible. To maximize the effect, the three depth gauges must have gently sloped surfaces to smoothly repel twigs and the like, while increasing the area of contact with the wood.

However, a problem that arises from having three depth gauges adjacent to each other is that chips tend to become clogged between the depth gauges. In other words, the gap in the plate thickness direction between each depth gauge is about 0.05 m, and the cutter link, especially the top and sloped parts of the depth gauge, moves through the fine chips discharged at a speed of 400 to 1200 m/min. This is because it moves while being rubbed against the wood at high speed. For this reason, once chips become clogged, the smooth movement of the saw chain is restricted, resulting in seizing and damage at various parts. Therefore, the inclination of the depth gauge 1 is small and it has to be steeply shaped, resulting in a sharp depth gauge at the top, and on the contrary, the depth gauge itself does not dig into the wood very much, making it less effective. Therefore, in this embodiment, the position of the top of the depth gauge of the cutter link and the connecting link is placed further forward than the front lippet,
The top of the sawbar's arc rises to adjust the depth of cut. Since the same method as that used in the public service No. 58-501942 is used, the depth of cut changes even on the flat part, and excessive biting easily occurs, and the troublesome problem of chip clogging still remains. It remains.

As mentioned above, although the effects of each are acknowledged, problems still remain.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide a saw chain that requires less imaging and does not have a kick pack.

[Summary of the invention]

The present invention was made by focusing on the fact that when a bowl extending from the center of rotation is rotated at a certain rotation angle, the height from the center of rotation can be freely changed depending on the length of the arm.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to FIGS. 1, 2, and 3 showing one implementation thereof.

The left and right cutting blades 3.4 each have a retaining part 8 extending downward of the base portion H, a front lippet hole B1 located in the center, a rear lippet hole I, and a rear lippet hole I located above, near the front lippet hole. A depth of cut adjustment gauge 5 is provided on the cutting edge and located further forward than the front lippet hole 5 with respect to the direction of movement of the saw chain, and has an inclined portion 6 and a top portion 7 that are gradually inclined upward toward the cutting edge 14. Be prepared. A pair of gauge links 4, side links, and 2 are pivotally connected to the front lippet via the front lippet α, which pivotally connect the left and right cutting blades 3.4. The gauge link 21 has the lippet hole 2, a rear lippet hole β, an apex (2) located near the center between the lippet holes 2, 13, and a front lippet hole from the apex (2). 2, it has an inclined surface V that is twice as gently inclined toward the lower front side as the inclined portion 6 of the left and right cutting blades 3.4. Similarly, a rear rivet (20) is inserted into the rear rippet hole 16 of the left and right cutting blades 3.4,
A pair of stopper links and side links 2 having appropriate chevron-shaped protrusions 4 are pivotally connected. When on the flat part of the saw bar, the apex 7 of the depth adjustment gauge 5 of the left and right cutting blades 3.4 is clearly located below the apex n of the depth gauge 9 of the gauge link 21. However, the distance from the cutting blade k can be set close to the cutting blade k to the extent that it does not get in the way when stretching.

An engaging portion 8 of the saw chain Nagi engages with a drive sprocket 26 (not shown), and the saw chain moves on the saw bar.

As shown in Figures 4 and 5, while cutting a certain material such as soft wood or a certain material without a knot, the depth of cut is always in a stable state as measured by the depth gauge 9, but once it hits a hard part such as a knot, the cutting depth A large force Po along the immediate angle θ of the blade H is generated, and the left cutting blade 3 and at least the pair of gauge links 4, the pair of side links 2, the stopper links, and the pair of side links 2 located in the front and rear are also It begins to move away from Sobers along θ. At the same time as this force, a rotational moment centered on the rear lippet is applied to the left cutting blade 3 and it begins to rotate, and the depth of cut adjustment gauge 5 begins to move toward the wood I. During this time, the depth gauge 9 of the gauge link Δ is always
When it comes into contact with the surface and cuts while keeping the depth of cut constant, when a larger force is applied to the cutting edge H, the left cutting edge 3
The cutting adjustment gauge 5 is made of wood! I bump into it. At this abutment position, the rake angle θ of the cutting blade 14 is set to approximately θ with respect to the wood l.
' By setting the depth of cut adjustment gauge 5 to the wood a as a reaction to the force P1 that hits the wood a, a rotating moment centered on the front lip of the left cutting blade 3 and returning to the saw barm acts on the cutting blade return to prevent excessive biting. You can easily escape. The reaction force at this time is not directly transmitted to the saw balm. That is, the energy is converted into a rotational moment centered on the rear lippet force, and since the rear lippet 20 is floating above the saw bar, the energy is transmitted to the saw bar via the stopper link O, so that the energy is greatly reduced.

In this way, the cut adjustment gauge 5 of the left and right cutting blades 3.4
is secured to the depth gauge 9 with this gauge link,
Moreover, since the apex n of the depth gauge 9 is located between the pet holes ν and 8, it is stable against forces applied from all directions, and can run smoothly on a curved wooden surface.

On the other hand, as shown in FIG. 6, in the circular arc portion 3 of the saw bar, in conjunction with the gauge link 4 running steadily, the depth of cut adjustment gauge 5 rises around the front lippet p of the left cutting blade 3, and one A gentle slope R is formed to smoothly brush off twigs and the like, and the locus of the top 7 is set to be 0 to 0.1 higher than the locus of the cutting edge H. When applying a force F to the depth of cut adjustment gauge 5 of the right cutting blade 4, that is, when drilling a hole using the arc portion σ, increase the depth of cut around the front lippet D. The cutting edge k rises up and starts cutting. The depth of cut becomes maximum when the gauge link 21 reaches the same trajectory as the depth gauge 9, and ideally it is 0.
．． When the depth of cut is 2 to 0.3 tm, the reaction caused by hand washing is small and the cutting ability is not reduced. Also, regarding the phenomenon of chip clogging,
In the flat part 5 of the sawbars, the cutting adjustment gauge 5 of the cutting blade 3.4 is much lower than the depth gauge 9 of the gauge link 21, and normally only the depth gauge 9 is in contact with the wood 27, so there is no gap between the two. Chips do not get stuck. Even if it becomes clogged, the depth of cut adjustment gauge 5 rises at the arc portion 3 of the saw bar and has the effect of removing chips, and generally the drive sprocket 26 is smaller than the arc portion of the saw bar 24.
The upper part provides a more effective chip evacuation effect.

The stopper link 23 in the above embodiment is Soche/1
This is to prevent the cutting blade 3.4 from falling backwards when subjected to force and damaging the side link 2 if the cutting blade 3.4 is attached to the saw bar in a very loose state.
1 may be substituted.

9 and 10 show another embodiment in which a connecting plate 31 having a depth gauge similar to the depth gauge 9 of the gauge link 21 is disposed on the side link 2 opposite to the gauge link 21.

The height of this depth gauge is equal to or lower than the depth gauge 9, and the top 30 can be brought close to the cutting blade 14 to the extent that it does not get in the way during stretching. The two gauges 21 and 29, which are independent of the cutting blade 3.4, contribute to doubling the stability during cutting, and are arranged so as to cover the sides of the short depth of cut adjustment gauge 5. The pocket part 31 formed by this has the effect of collecting chips on the sawing track of the saw chain and surely discharging them out of the track, thereby promoting smooth cutting. Furthermore, by arranging the cutting blades 3.4 continuously and alternately, the number of cutting blades 3.4 is doubled, and the depth of cut per blade is reduced to %, thereby increasing the force applied to the cutting blade 14. This has the effect of extending the life of the cutting blade 14 and reducing the force transmitted to the saw blade.

Even if the depth gauge 9 and the depth gauge device have a shape that expands upward within the set width than the thickness of each plate, the effect remains the same.

In both the embodiments shown in FIGS. 9 and 10 and in which the number of cutting blades 3.4 is doubled, the effect is not diminished even if the gauge link 21 is used instead of the connecting plate 31.

〔Effect of the invention〕

As described above, according to the present invention, the cut adjustment gauge 5 of the cutting blade 3.4 is placed in front of the front lipet hole, and the top part 7 of the gauge link 21 is connected to the lipet hole n of the gauge link 21.
Since the depth gauge 9 is located below the apex 11 of the depth gauge 9, which is located approximately in the center between the depth gauges 13 and 13, it is possible to prevent excessive biting and also to solve clogging of chips.

[Brief explanation of drawings]

Fig. 1 is a side view showing one embodiment of the saw chain according to the present invention, Fig. 2 is a side view of the left cutting blade of Fig. 1, and Fig. 3 is a side view of the left cutting blade of Fig.
The side view of the gauge link 7 in the figure, Figures 4 and 5 are side views showing the operation of this embodiment, and Figure 6 shows the operation when the saw chain of this embodiment is in the circular arc portion of the saw blade. FIG. Figures 7 and 8 are front views of a conventional saw chain, Figures 9 and 8g] Figure 0 shows another embodiment of the present invention, Figure 9 is a side view, and Figure 10 is a top view. It is. 3 is the left cutting blade, 4 is the right cutting blade, 5 is the cutting depth adjustment gauge, 9
is the depth gauge, 2 is the saw chain, and 21 is the gauge link. Name of patent applicant Hitachi Koki Co., Ltd. +10 Figure 5 of 4 + Figure 6 10 Figure 1 of 1,3 Figure 0 'I? 10 countries

Claims (1)

[Claims] In a saw chain with a cutting blade, the saw chain includes a plurality of drive links and a plurality of pairs of side links that pivotally connect the drive links, the drive link has a cutting adjustment gauge, and cutting blades are arranged alternately. The link has a gauge for adjusting the cut, the apex of the gauge is located approximately in the middle of the pet hole in the side link, and on the flat part of the saw bar,
The depth of cut adjustment gauge of the cutting blade is located high relative to the top, and conversely is located low at the arcuate tip of the saw bar, and the slope of the gauge of the side link and the depth of cut adjustment gauge of the cutting blade A saw chain characterized in that the slope and the slope form one large slope.