EP1541306A1 - Safety system for table chainsaws - Google Patents

Abstract

The saw has an upper contact guard (2) in front of the cutting chain in direction of cutting, which slides vertically parallel to the chain. A lower contact guard (3) is fastened flexible to the saw bench, parallel to the chain. The guards cover the chain when this is not in use, and when a work piece (5) moves towards the chain, vertical position changes of the guards cover the chain during all stages of sawing. A rear contact guard (4) protects the chain sword (1), and is connected to a splitting wedge fastened below the saw bench. The front guard is mounted vertically moveable on the rear guard. A filter unit with guide plates is positioned under the bench so that coolant air for the motor removes saw dust from the chain area. The bench saw is of modular construction.

Description

The invention relates to a safety system on table chain saws, which designed in such a way is that sufficient protection is ensured for all profiles that are to be separated. Farther certain components of the safety system should contribute to that Chain sword works great in separating large workpieces and therefore heavy load. To suck the sawdust suggestions are made, so that by dirt the security system is not affected.

Table chain saws have been state of the art for years, but so far have only been in practice limited enforced. One reason is the insufficiently resolved security issues.

In DE 298 10 050 U1, a Tischkettensägevariante, although the task has a To suggest the largest possible cutting length perpendicular to the workpiece support are not even suggestively safety issues have been included.

Of course, the efforts are recognizable, safety problems on table chain saws to solve. According to DE 201 04 964 U1 a braking device for a Tischkettsäge proposed. It is assumed - so it says in the description of the utility model - That a protective cover the chain sword completely or partially wrapped. It will further stated that at least always a portion of the saw is exposed during separation. In terms of nothing is done for improved safety, but at work safety It is proposed a special brake mechanism for the chain drive, the effective If no pressure is exerted on the chain when the workpiece is missing.

DE 199 39 769 A1 describes security elements under significant use of a Guard. It is stated that ,, ... the cutting edge is only set in motion (Will) when the workpiece to be cut raises the guard and pressure against the Cutting edge. "It should not be overlooked that the safety technology does not guarantee sufficient protection when disconnecting all profiles.

It is therefore the object of the invention for a table chain saw a new security system propose. The table chain saw should be safe when separating various profiles to be operated by giving intervention protection in every situation. Also when disconnecting large workpieces, the safety system should be effective and the chain sword the required Have stability. It is also the object of the invention, a clean work to allow by removing the sawdust from the cutting area in front of To prevent all contamination by sawdust on proposed safety system.

The problem is solved as follows, taking into account the fundamental inventive ideas Reference is made to claim 1. The further embodiment of the invention arises from the claims 2 to 4.

To illustrate the invention, further embodiments are required.

According to the invention, in contrast to the prior art, a comprehensive intervention protection suggested at the table chain saw, it becomes an upper (front) and a lower (front) Intervention protection provided. For example, to cut a log, the must Cutting chain can be covered above and below the roundwood. As much as the workpiece brought to the substantially perpendicular from the table top projecting chain sword , the workpiece displaces the respective engagement protection. It moves the respective intervention protection in the cutting direction seen in front of the chain parallel to this up or down. With light pressure against the chain, the chainsaw is switched on and it starts the separation process. Using the upper and lower engagement guard The workpiece is enclosed during the separation process, so that the cutting chain is covered in every position.

Furthermore, a rear intervention protection is provided in the upper area of the chain sword. The chain sword is attached to the rear entrance guard. A stable version of the Rear mesh guard in combination with a so-called riving knife, which is attached to the saw table fixed, thus solves the problem of stability of the chain sword, especially when cutting large workpieces.

It should be noted that in the period of sawing the length of the saw chain changed. To prevent damage to the saw chain, a set voltage must be ensured be. According to the invention the chain sword is mounted vertically sliding and through an adjustable spring held on tension. When the spring is relaxed, you can Easily change the cutting chain without tools.

The sawdust produced during the sawing process is placed under the saw table by the saw chain promoted. Because of its structure, the cutting chain accounts for a significant proportion of the Sawdust on the back again promotes the saw table, the sawing work considerably impaired. According to the invention, the cooling air of the drive motor is directed so that remove the sawdust from the chain area. Further details are given here in the embodiment.

Furthermore, it is proposed to arrange a commercial chainsaw in a saw table with maximum consideration of the proposals according to the invention accordingly existing versions. This means that the saw table with the safety system and other components and a mounting unit for the commercial chain saw so far prefabricated and assembled is that the chainsaw with few handles on the saw table can be placed. Place the pre-assembled saw table and the standard chainsaw thus a table chain saw in a modular design, this table chain saw safely can be served.

Figur 1:

Tischkettensäge in Kuhestellung

Figur 2:

wie Fig. 1, auf dem Sägetisch wird ein Rundholz zugeführt

Figur 3:

Tischkettensäge in Arbeitsposition

Figur 4:

Einzelheit - Verstelleinheit für vertikal gleitend befestigtes Kettenschwert

Figur 5:

hinterer Eingreifschutz und Gleitschiene für den vorderen oberen Eingreifschutz

Figur 6:

oberer Eingreifschutz als Abwicklung

Figur 7:

Schnitt A-A gemäß Figur 5

Figur 8:

Späneabsaugeinrichtung

Figur 9:

vormontierter Sägetisch zur Aufnahme einer handelsüblichen Kettensäge

Figur 10:

Sägetisch mit vormontiertem Sicherheitssystem und handelsüblicher Kettensäge in modularer Bauweise

The invention will now be explained with reference to exemplary embodiments. The individual figures show a schematic representation

FIG. 1:

Table chain saw in cow position

FIG. 2:

like Fig. 1, on the saw table, a roundwood is supplied

FIG. 3:

Table chain saw in working position

FIG. 4:

Detail - Adjustment unit for vertically slidably mounted chain sword

FIG. 5:

rear gripping protection and slide rail for the front upper gripping protection

FIG. 6:

Upper intervention protection as settlement

FIG. 7:

Section AA according to FIG. 5

FIG. 8:

chip suction

FIG. 9:

Pre-assembled saw table for holding a standard chain saw

FIG. 10:

Sawing table with pre-assembled safety system and standard chain saw in modular design

The reference symbols used mean: 1 - Chain Sword 11 - cutting chain 2 - upper intervention protection 12 - riving knife 3 - lower intervention protection 13 - rail 4 - Rear intervention protection 14 - roles 5 - workpiece 15 - Fastening unit for standard chainsaw 6 - drive motor 7 - elastic tensioning device 16 - micro button 8 - spring 17 - Filter unit with baffles 9 - adjusting screw 18 - Filter 10 - threaded rod 19 - saw table

Figure 1 shows the Tischkettensäge with the upper, the lower and the rear Eingreifschutz 2, 3, 4. The upper mesh guard consists of a triangular bow that is vertical is movably attached to the rail 13, see also Figure 5. The rail 13 is firmly connected with the rear Eingreifschutz 4 and this in turn with the riving knife 12. The Splitting wedge 12 is made of high-strength material and is mounted under the saw table 19. So that the chain sword 1 above the saw table 19 has the required stability, that is Chain sword 1 near the upper sprocket attached to the rear Eingreifschutz 4. This is solved the problem that even when separating large workpieces the stability of the chain sword 1 is given or the chain sword can not be damaged The lower Eingreifschutz 3 is resiliently mounted and has a slope in the direction of the workpiece. 5

If the workpiece 5 is cut through, which represents a round timber according to FIGS. 2 and 3, the cutting chain 11 must be covered above and below the roundwood. According to the invention is with the workpiece 5, the upper Eingreifschutz 2 and the lower Eingreifschutz 3 from the Primary position displaced - as can be seen from Figure 3 - and the upper and lower Eingreifschutz 2.3 enclose during the sawing the workpiece 5 so that the cutting chain eleventh is covered in every position.

It makes sense if the engine 6 is not constantly running, but only turned on when the Upper and / or lower Eingreifschutz be touched. Will then on in the further pressure the cutting chain 11 is exercised, via an electromagnetic clutch, the cutting chain 11 in Movement set.

Although not shown in the figures, the chain-link 1 is with the chain 11 stationary tilted a few degrees forward (towards the workpiece 5). With the pressure of the workpiece 5 on the cutting chain 11, the chain sword 1 moves in a right-angle position compared to the saw table 19. The movement of the chain sword 1 releases under the saw table 19 a micro-probe 16, whereby the electromagnetic clutch engages.

The free vertical mobility of the upper Eingreifschutzes 2 and the resilient mounting of the 3 ensure that after completion of the separation process of the respective Eingreifschutz (2, 3) immediately returns to the starting position. The upper engagement protection falls due to gravity in the starting position.

Thus bein leg the required view of the workpiece 5 given in the cutting chain area is (although the cutting chain 11 is covered), the upper Eingreifschutz has Sehschlitze on. Reference is made to FIG. 6.

It is very important that the upper engagement guard 2 is slightly vertically movable so that this important guard does not interfere with work. As can be seen from FIGS. 5 and 7, two rollers (roller pairs) 14 move in the rail 13 with the engagement protection.

Reference is now made to FIG. It has already been said that the cutting chain 11 changed over time. Therefore, the chain sword 1 becomes vertically slidable under the saw table 19 attached. At the lower end of the chain sword 1, a threaded rod 10 is attached, this is an adjusting screw 9, which holds against the spring 8, the cutting chain 11 to tension. It It should be noted that these details are also part of the security system Table chain saws are. It's about the easy tensioning and, if necessary, to replace the cutting chain 11. When the spring 8 is relaxed, you can easily change the cutting chain 11 without tools.

Safety aspects are also relevant in the proposal of Figure 8, the Chip and dust extraction. Chips and dust can generally function as technical Affect devices. Especially with regard to the table chain saw Due to the structure of the cutting chain 11 a significant proportion of sawdust on the back is again promoted to the saw table 19, proposals for dust and chip removal required. According to the present invention it is assumed that the Cooling air for the engine 6 Remove the sawdust from the chain area. For this purpose baffles used. A more sophisticated solution is shown for example in FIG. Through the Sägeschlitz and also below the saw table 19 occurs cooling air (see arrows) in a filter unit 17. There chips or dust can be deposited. Above that Filter 18 exits the purified air and fulfills its task as cooling air for the engine. 6

Finally, reference should be made to a variant according to FIGS. 9 and 10. By the Sägeschlitz in the table top is the chain sword of a standard chainsaw introduced and positioned with the fastening unit 15. The security system on the Saw table is pre-assembled. The modular design, namely saw table with pre-assembled safety system in conjunction with a commercial chainsaw allows one cost-effective use of a chainsaw now as a table chain saw with the essential Features of the previously described security system.

Claims (4)

Safety system on table chain saws, characterized in that seen in the cutting direction before the cutting chain (11) an upper engagement protection (2) is arranged vertically sliding parallel to the cutting chain (11) and a lower engagement protection (3) parallel to the cutting chain (11) resiliently on the saw table ( 19), in the resting state of the chain saw, the upper and the lower Eingreifschutz (2,3) cover the cutting chain (11) and in the supply of a workpiece (5) to the cutting chain (11) or during sawing the upper and lower Eingreifschutz (2,3) by vertical position change in each phase of the separation by the position of the upper and lower Eingreifschutzes (2,3) a cover of the cutting chain (11) is given and further a rear engagement protection (4) covering the chain blade (1) in which the front engagement guard (2) is arranged to be vertically movable on the rear engagement guard (4), and the rear engagement guard (4) is further provided with an S. paltkeil (12) is connected, which in turn is mounted under the saw table (19). Safety system on table chain saws according to claim 1, characterized in that below the saw table (19) baffles are arranged or a filter unit (17) is arranged with baffles such that thus allows the cooling air for the motor (6) removing the sawdust from the cutting chain area , Safety system on table chain saws according to claim 1, characterized in that the chain sword (1) under the saw table (19) is mounted vertically slidably, at the lower end of the chain sword (1) a threaded rod (10) is fastened with an adjusting screw (9) against the spring (8) holds the cutting chain (11) to tension. Safety system on table chain saws according to claim 1, characterized in that a table chain saw is designed in a modular design by a per se commercial chain saw is arranged on a saw table with preassembled security system.

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