JPH0516969B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for positioning a band within a certain range during driving in a band saw, especially a diamond tip saw, and particularly relates to a method for positioning a band within a certain range during driving, and in particular, a method for positioning a band within a certain range during driving. The band is characterized in that an appropriate forward force is applied to the band by adjusting the direction of rotation.

(Prior Art) A band saw is a cutting machine in which an endless band with a large number of cutting blades attached at equal intervals on the front edge is suspended from a pair of upper and lower tires. It cuts by pressing a cutting material such as stone. For this reason, band saws have traditionally applied forward force to the band by making the diameters of the front and rear tires different.
It is configured to maintain a constant position during driving against the pressing force of the material to be cut. However, with this band saw, it is necessary to apply a strong separation force between the upper and lower tires to press the band against the tires, so while there is no problem with a band saw for wood, in the case of a diamond chipsaw, Cracks were likely to occur in the band, making it impractical.

One way to improve this problem is to install a regulating roll on the trailing edge of the band to prevent the band from retreating (Utility Model Application No. 78414/1983).
A method was attempted (Japanese Patent Laid-Open No. 175007/1983) in which the position of the band is detected and when the band retreats, the feeding speed of the material to be cut is slowed to reduce the pressing force against the band. However, with the former method, if pressure above a certain level is applied to the band, the band twists and vibrates violently, making it impossible to continue operation, while with the latter method, the cutting speed decreases, so neither is practical. It was not possible to convert it into a

(Means for Solving the Problems) The present invention solves the above-mentioned drawbacks of the conventional band saw, and includes an adjustment roll that is brought into pressure contact with a suitable position on the return side of the band, and the rotational direction of this adjustment roll is adjusted. This applies a desired forward force to the band.

(Example) The present invention will be specifically described below based on the illustrated example.

Reference numeral 1 in the figure is a band saw machine, which is one of the main components of the present invention, and is equipped with a driving tire 2 and a driven tire 3, on which an endless band 4 is suspended. The figure shows an example of a diamond tip saw in which a diamond tip 4a is attached to the front edge of the band 4. This band saw machine 1 has a rail 5 laid on the feed side of the band 4, and a running material wheel 6 is placed on this rail 5.
is listed. In order to make the running material vehicle 6 reciprocate, the driving motor M may be mounted directly on the material running vehicle 6, or the motor M may be installed in a pit in the factory and used to drive the winding drum of wire, etc. There is no problem even if it is driven by a mechanism. Further, although not shown in the drawings, the running material wheel 6 is provided with a holding device, a traversing device, or a reversing device for the material to be cut A.

The present invention is applied to the band saw constructed in this manner, and first, the adjustment roll 7 is attached to the return side of the band 4. This adjustment roll 7 applies a force that opposes the pressing force of the material A to be cut, that is, a forward force, to the band 4, and positions the band 4 within a certain range during driving. The shaft angle is adjustable and the direction of rotation can be changed. In the figure, an example is shown in which the adjustment rolls 7 are paired and the band 4 is sandwiched between them, but the invention is not limited to this, and the adjustment rolls 7 may be configured with only one of the rolls. Of course, there is no problem. In short, it is sufficient to press the adjustment roll 7 against the band 4 so that no slip occurs between the adjustment roll 7 and the band 4. Furthermore, a position detection device 9 is provided near the band 4. This device detects the position of the band 4 while it is being driven, and adjusts the forward force that urges the band to position the band 4 within a certain range. , 9c, which detects the position of the trailing edge of the band 4, transmits the detection output to the control device 8, and further transmits it to the shaft angle adjustment mechanism (not shown) of the adjustment roll 7. Thus, the forward force of the band 4 is adjusted.

Next, the operating mode of the band saw described above will be explained, as well as a control method. First, the material to be cut A is loaded and positioned on the running material wheel 6 according to a conventional method, and the bandsaw machine 1 is put into a driving state. Note that at this stage, the band 4 is under no load and is in the most advanced state. (See Figure 2). After the predetermined preparations have been made, the running wheel 6 is driven to feed the material A to be cut into the band 4, and cutting is started. Then, the band 4 retreats due to the pressing force of the material to be cut A, and this is detected by the position detection device 9 and the rotation direction of the adjustment roll 7 is adjusted. That is, first, when the rear end edge of the band 4 retreats to the position of the phototube 9a, the position detection device 9 detects this and sends the detection output to the control device 8, and the position detection device 9 detects this and sends the detection output to the control device 8. is raised to change the direction of rotation to the right and apply a forward force f to the band 4. still,
At this time, the band 4 is
It is preferable to set the amount of variation in the rotational direction of the adjustment roll 7 in advance so that the rear end edge is located between the photocells 9a and 9b, and then vary the rotation axis all at once to a predetermined angle. be. When the feeding speed of the material to be cut A is increased or the sharpness of the diamond chip 4a is decreased, the pressing force of the material to be cut A increases accordingly, and the band 4 retreats. When the rear end edge of the band 4 reaches the phototube 9b, the position detection device 9 detects this and changes the axial angle of the adjustment roll 7 by a very small fixed amount.
The forward force f of band 4 is increased, and the rear edge of band 4 is
It is located between a and 9b. If this adjustment does not advance the band 4 to a predetermined position and the rear edge is located behind the phototube 9b, further adjustment is made in the rotational direction after a certain period of time, and the rear edge is The adjustment is repeated until it moves forward of the phototube 9b. Of course, in this case, when the rear edge of the band 4 reaches the phototube 9a, the axial angle of the adjustment roll 7 is changed in the opposite direction to the above to weaken the forward force f of the band 4, and Even if the axial angle is varied to the maximum limit, if the band 4 retreats and its trailing edge reaches the photocell 9c, the feed speed of the material to be cut A is considered too fast and is slowed down, or This is because the diamond chip 4a has become dull and is dressed up.

(Effects of the Invention) As described in detail above, the present invention applies an appropriate forward force to the band by press-contacting the adjustment roll to the return side of the band suspended between a pair of upper and lower tires and adjusting the axis angle of the rotation axis. This force acts as a resistance against the pressing force of the material to be cut to keep the band within a certain range, and the adjustment roll also acts as a kind of tension pulley on the band. , the twisting and vibration of the band is stopped,
This allows for efficient cutting work.

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing the device of the present invention;
FIG. 2 is a front view showing the main parts of the same. 1; Band saw machine, 2; Drive side tire, 3; Driven side tire, 4; Band, 5; Rail, 6; Log truck,
7; Adjustment roll; 8; Control device; 9; Position detection device.

Claims (1)

[Claims] 1. An adjustment roll is provided on the return side of the band of a bandsaw machine made by hanging a band between a driving tire and a driven tire, and this is brought into pressure contact with the band, and the position of the band is detected during driving, and the adjustment roll is thereby A method for regulating the position of a band in a band saw, characterized in that the axial angle of the rotating shaft of an adjustment roll is adjusted, and a desired forward force is applied to the band to position it within a certain range.