RU2232068C1 - Method for setting two-apex teeth of saw web and apparatus for performing the same - Google Patents

Abstract

FIELD: sawing and wood working industry branch.

SUBSTANCE: method comprises steps of bending odd teeth to one side and event teeth to other side by the same value in direction normal relative to plane of saw web toward cutting edges of teeth; bending teeth along their symmetry axis and forming bending lines extending outside line of teeth recesses. Apparatus includes drive unit for rotating setting tools and housing with groove for saw web. Tools for setting teeth are mounted on the same axis in parallel shafts arranged housing. Axes of shafts are parallel relative to lengthwise direction of groove for placing saw web. Lateral surface of disc tool on one shaft is in the form of cone and on other shaft it is in the form of cone recess.

EFFECT: possibility for increasing time period for keeping value of teeth setting at using saw.

4 cl, 3 dwg

Description

The group of inventions relates to the field of preparation of saw teeth and can be used in the sawmill and woodworking industry.

A known method of divorce two-vertex teeth of the saw blade [1], which consists in bending the odd teeth in one direction, and even in the other by the same amount in the direction normal to the plane of the blade. When implementing the known method, the tooth bending line passes through their bases or is shifted parallel to the tooth bases towards their vertices. The specified offset can reach 0.7 tooth height.

The known method for the combination of essential features is the closest to the claimed method and is selected as the closest analogue.

It is also known a device [2] that implements the specified method. The device comprises a rotation drive of adjustable tools and a housing with a groove for accommodating the saw blade. In the housing, on the parallel shafts, disk adjustable tools, cylindrical guides and gear wheels of the rotation drive of adjustable tools are coaxially fixed.

The shafts are installed in the housing in such a way that their axes are perpendicular to the longitudinal direction of the groove of the housing. In this case, disk adjustable tools made in the form of truncated cones are placed on the shafts so that their smaller bases face the back of the saw blade.

The known device for the combination of essential features is the closest to the claimed one and is selected as the closest analogue.

A disadvantage of the known method of divorce and the device that implements it is to reduce the magnitude of the divorce during the operation of the saw. This is due to the fact that when the teeth reach a certain amount of wear, the friction forces acting in the direction of decreasing the divorce increase, which overcome the elastic forces of the teeth. As a result, the amount of tooth divorce decreases. In practice, the need for re-divorce arises with each regrinding of the teeth of the saw blade.

The technical result of the invention is to increase the retention time of the divorce during the operation of the saw blade.

The specified technical result is achieved by the fact that in the method of divorcing two-vertex teeth of the saw blade, which consists in bending the odd teeth to one side, and even to the other by the same amount in the direction normal to the plane of the blade towards the cutting edges of the teeth, according to the invention, the bending of the teeth carried out along their axis of symmetry with the formation of bending lines extending beyond the line of tooth cavities.

In the device for the separation of the teeth of the saw blade that implements the inventive method, comprising a rotation drive of adjustable tools and a housing with a groove for accommodating the saw blade, parallel shafts mounted on the case on which disk adjustable tools are coaxially mounted, and gear wheels of a rotation drive of adjustable tools, said technical the result, according to the invention, is achieved by the fact that the axis of the shafts are parallel to the longitudinal direction of the groove for accommodating the saw blade, the drive is equipped with a return mechanism but rotational motion of gears and the side surface of the disc movable tool on one of the shafts is formed as a cone, and the other - the trough corresponding conical shape.

In addition, the mechanism of the reverse-rotational movement of the gears is made in the form of a lever, on one end of which a groove is made, interacting with a side surface with a cam eccentrically mounted on the rotation drive shaft, the other end of the lever being rigidly fixed to one of the shafts parallel to the shaft .

On parallel shafts installed in the housing, rows of disk adjustable tools can be placed with alternating lateral surface shapes.

When implementing the proposed method, the tooth bite is provided by the convergence of the tops of the teeth during their longitudinal folding. In this case, the bending line, which runs along the axis of symmetry of each tooth and extends beyond the line of tooth cavities, forms a stiffening rib, which significantly increases the resistance of the tooth to friction forces directed towards decreasing the divorce.

A device that implements the inventive method, allows for the separation of the teeth along the entire length of the saw blade (when installed on the parallel shafts of the corresponding number of disk adjustable tools) for one cycle of the rotary movement of the gears.

The invention is illustrated by graphic materials, where

- figure 1 shows a General view of a device that implements the inventive method of tooth divorce;

- figure 2 is a view a in figure 1;

- figure 3 - disk adjustable tools with a fragment of the saw blade.

The device comprises a housing 1 with a groove 2 for accommodating the saw blade. In the housing 1, shafts 3 and 4 are installed parallel to the longitudinal direction of the groove 2, on which disk adjustable tools 5 and 6 and gears 7 and 8 of the rotation drive of adjustable tools 5 and 6 are coaxially mounted. The lateral surface of the disk adjustable tools 5 is made in the form of a cone, and disk adjustable tools 6 - in the form of a groove of the corresponding conical shape. Adjustable disc tools 5 and 6 on shaft 3 and tools 6 and 5 on shaft 4 are installed alternately. The total number of disk adjustable tools 5 and 6 on the shafts 3 and 4 is set according to the number of teeth of the saw blade. The rotation drive of the disk adjustable tools 5 and 6 includes a gear motor 9, a mechanism for the reciprocating movement of the gears 7 and 8, gears 7 and 8. The mechanism of the reciprocating movement is made in the form of a lever 10, at one end of which a groove 11 is made , a lateral surface interacting with a cam 12, eccentrically mounted on the output shaft of the gear motor 9. The second end of the lever 10 is rigidly attached to the shaft 3.

A device that implements the inventive method of divorcing two-vertex teeth of the saw blade, works as follows.

When the gearmotor 9 is turned on, its output shaft rotates together with a cam 12 eccentrically fixed on it, which, interacting with the lateral surface of the groove 11 of the lever 10, gives the latter an oscillatory movement relative to the axis of the shaft 3. Since the end of the lever 10 is rigidly fastened to the shaft 3, the gear wheels 7 and 8 make a rotational motion. Orienting the saw blade with the gear to the side of the disk adjustable tools 5 and 6, install it in the groove 2. When a contact occurs between the gear of the saw blade and the disk adjustable tools 5 and 6, the latter tighten the saw blade in the transverse direction of the groove 2, gradually forming the necessary tooth separation. At the time of the final formation of the tooth divorce, the gears 7 and 8 stop rotation, ensuring the movement of the saw blade in the groove 2 in the depth of the housing 1 and begin to rotate in the opposite direction.

In this case, the saw blade moves in the groove 2 also in the opposite direction until it is released from capture by disk adjustable tools 5 and 6.

Thus, the required separation of the teeth of the saw blade is made in one cycle of the reciprocating motion of the gears 7 and 8.

Sources of information

1. GOST 26215-84. Hacksaws for wood. Technical conditions USSR State Committee for Standards, Moscow, 1984, p. 2.6.

2. Description of the invention to the copyright certificate of the USSR No. 1669652, IPC B 23 D 63/04, publ. 1991 year

Claims (4)

1. The method of divorce two-vertex teeth of the saw blade, which consists in bending the odd teeth to one side, and even to the other by the same amount in the direction normal to the plane of the blade towards the cutting edges of the teeth, characterized in that the bending of the teeth is carried out along their axes symmetries with the formation of bending lines extending beyond the line of tooth cavities. 2. A device for spreading the teeth of the saw blade, comprising a rotary drive of adjustable tools and a housing with a groove for accommodating the saw blade, parallel shafts mounted on the housing on which disk adjustable tools are coaxially mounted, and gear wheels of a drive of rotation of adjustable tools, characterized in that the axes the shafts are parallel to the longitudinal direction of the groove for accommodating the saw blade, the drive is equipped with a mechanism for the rotational movement of the gears, and the side surface of the disk adjustable the tool on one of the shafts is made in the form of a cone, and on the other a groove of the corresponding conical shape. 3. The device according to claim 2, characterized in that the mechanism of the reciprocating motion of the gears is made in the form of a lever, at one end of which a groove is made, interacting with a side surface with a cam eccentrically fixed to the rotation drive shaft, the other end of the lever being rigidly fastened to one of the shafts installed in parallel in the housing. 4. The device according to claim 2 or 3, characterized in that on the parallel shafts installed in the housing there are rows of disk adjustable tools with alternating shapes of the side surface.

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