JPS5812135B2 - Blade holding device for diamond tip band saw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diamond tip band saw mainly used for cutting stone, and in particular to a holding device that can stably hold a blade running on an elliptical track. .

The present inventor has developed a cutting device using a diamond tip band saw that can significantly improve the efficiency and precision of cutting stones, etc., and has already applied for many patents.

In this blade, an endless blade equipped with a large number of diamond tips runs along a substantially elliptical track that is a combination of a turn section and a straight track, and the straight track is used as a cutting action section.

This blade is held and driven in a range other than the cutting area, but at this time, since the blade is held in tension on a tire or multiple guide rollers during turns, when the blade is bent, the diamond Since the tip is hard and inflexible, a crank occurs at the tip attachment part of the blade, making it unusable.

In order to eliminate this drawback, various blade holding methods have been devised, and the present invention is also a part of this method.The basic point is that a plurality of guide rotating bodies are installed on the inner surface of the blade at the turn portion. When the blade is inscribed and stretched, a bending force is generated at the part where the blade contacts the guide rotor, and this bending causes cranking. To prevent this, a guide gap for the chip is installed on the circumferential surface of the guide rotor. When the tip attached to the blade reaches the bend, it is always located in this guide gap to maintain the straightness of the blade and prevent cranking.

The present invention will now be described in detail based on illustrated embodiments.

Reference numeral 1 is an endless blade formed of a thin steel plate,
A large number of diamond chips 2 are attached at intervals to this device.

Reference numeral 3 denotes a blade drive section, which is an example in which an endless drive belt 4 is inscribed in a turn section 7 by a pulley 5 and a guide rotating body 6, which will be described later.

As an example, the shaft of the pulley 5' is connected to the drive motor 11 as the input shaft 8.

Although the above embodiment is used as an example of the blade driving section 3, it is not limited thereto, and other methods such as bringing the driving roller into direct contact with the blade 1 may be used.

On the other hand, a plurality of guide rotors 6 are inscribed in the turn portion 7 at intervals to set the traveling trajectory of the blade 1, and since the blade 1 is suspended by these, the guide rotors 6 are inscribed at intervals. It bends every six points, forming an arc shape as a whole.

The guide rotors 6 are connected to rotate in the same direction at the same time, and one of them is connected to an input shaft 10 of the guide rotor drive unit 9.
is provided, and this is connected to the input shaft 8. of the blade drive section 3. It is also connected to a drive motor 11 and rotated at the same speed as the blade 1.

In the illustrated embodiment, a sprocket 12 is integrally formed on the shaft of each guide rotating body 6, and an endless chain 13 is suspended from each sprocket 12.

In the illustrated embodiment, one of the turn parts is driven, and the other part transmits the driving force of the blade via the belt.
It is something that is rotated.

Next, a guide gap 14 for the chip 2 is formed on the circumferential surface of the guide rotor 6.

The one shown in FIG. 3 is an example of this, in which a plurality of free rollers 15 are provided at intervals on the circumferential surface of the guide rotor 6, and the free rollers 15 are projected onto the circumferential surface of the guide rotor 6. By this, the guide gap 1 is formed between the pair of free rollers 15.
4.

In each guide rotating body 6, the tip 2 of the blade 1 is set to be located approximately at the center of the guide gap 14. In this way, the blade 1 is positioned between the pair of free rollers 15. By maintaining the straightness, no bending force is applied to the mounting portion of the chip 2, and therefore no cranking occurs.

By the way, in the present invention, the tip 2 of the blade 1 is
The guide gap 14 of the guide rotating body 6 is always
The blade drive section 3 and the drive section 9 of the guide rotor are rotated at the same speed, and the blade 1 is driven while maintaining the above state.

However, due to changes in load, the blade 1 slips between itself and the blade drive unit 3, which causes a misalignment between the blade 1 and the guide rotating body 6. In this case, the tip 2 is positioned in the guide gap. 14 and is subjected to bending force.

Therefore, an attempt is made to automatically correct this deviation and maintain the normal relative position between the blade 1 and the guide rotating body 6, and the following configuration is adopted.

First, the blade drive unit 3 and the guide rotor drive unit 9 are connected to the same drive motor 11, and one of them detects and corrects the misalignment between the blade 1 and the guide rotor 6. It connects the control device 16.

In the illustrated embodiment, the control device 16 is connected to the guide rotor 6 by way of example.
It is connected to the side.

The reference numeral 17 is a so-called differential gear device, and the fourth
As shown in the figure, the ring gear 19 is attached to the drive pinion 18.
The differential case 20 is also integrated with the ring gear 19.
A pair of differential pinions 21 and 22 are taken out from the shaft, and a pair of side gears 23 and 24 are meshed with them.

The drive motor 11 is connected to the shaft 23' of one side gear 23, and the bevel gear 25 rotates on the same axis.
and connect it to the input shaft 8 of the blade drive unit 3.

In addition, in the externally powered side gear 24, the rotation of the shaft 24' is taken out by a bevel gear 25', which is connected to the input shaft 10 of the guide rotary body drive section 9.

With such a configuration, when the drive pinion 18 is fixed, the input shafts 8 and 10 of both moving parts rotate at the same time and at the same speed.

Here, the feed motor 26 is connected to the drive pinion 18 .

This device applies desired rotation in the forward or reverse direction in response to an electrical signal, and uses, for example, a step motor.

As mentioned above, this device needs to be fixed when stopped, so a so-called motor with a brake is used.

Further, it is also possible to take measures such as interposing a worm speed reducer between the drive pinion and the motor.

Next, as an example of a means for detecting the misalignment between the blade 1 and the guide rotor 6, as shown in FIG. Through holes 27 and 28 are bored at one point and at one point of the guide rotating body 6, and photoelectric detectors 29 and 30 are installed to detect passage through the through holes, respectively.

When a misalignment occurs between the blade 1 and the guide rotating body 6, the moment of passage through the through holes 27 and 28 shifts, so this misalignment is converted into an electrical signal and input to the feed motor 26. .

As for the control circuit that performs the conversion into electrical signals, any known electrical circuit that is normally provided on the market with phototube detectors etc. may be used as appropriate.
The explanation here will be omitted.

Incidentally, such a detection means is not limited to a phototube detector, but it goes without saying that various kinds of detection means, such as one using pulses, can be selectively used as appropriate.

Since the present invention has the above-described configuration, when the blade drive section 3 and the guide rotor drive section 9 are simultaneously driven by the drive motor 11 at the same speed, the tip 2 attached to the blade 1 is moved to the turn section 7. When it reaches the tip, it is always located in the guide gap 14, and since the suspended blade 1 maintains its straightness in this part, no cracks occur in the chip attachment part.

Moreover, when a misalignment occurs between the blade 1 and the guide rotating body 6, the control device 16 operates to automatically correct the misalignment.

That is, the photoelectric detector 29 detects the moment when the through holes 27 and 2B pass through.
, 30, and if one is faster or slower than the other, a corresponding electrical signal is input to the feeding motor 26.

Then, the motor 26 rotates, and forward or reverse rotational feed is applied to the side gear 24 via the drive pinion 18 and ring gear 19.

Of course, this action is performed while the drive motor 11 continues transmitting the rotational force.

Therefore, the guide rotary body 6 moves back and forth by the amount of the added feed, and the relative position between the chip 2 and the guide gap 14 becomes normal.

As described in detail above, in the present invention, even in the turn portion, the blade near the tip attachment portion is turned while maintaining a straight shape in the guide gap, so that cracks do not occur in the tip attachment portion.

Furthermore, even if a misalignment occurs between the blade and the guide rotor, it can be corrected by the control device, and a stable running condition can always be maintained.

In order to correct the misalignment, as shown in the figure, the misalignment between the blade and the guide rotor is detected at one location, and the signal is simultaneously input to the feed motors 26 provided at both turn sections. Although not shown, it is also possible to detect the misalignment between the blade and the guide rotating body individually at both turn portions, and input the signal to each feed motor. do not have.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted plan view showing one embodiment of the present invention, and FIG.
FIG. 3 is a partially cutaway front view of the same as the above, FIG. 3 is a partially enlarged plan view of the same as the above, FIG. 4 is a sectional view showing the control device, and FIG. 1; Endless blade, 2; Chip, 3 Nib blade drive unit, 6; Guide rotary body, 9; Guide rotary body drive unit, 14; Anai gap, 11; Drive motor, 16; Control device, 17; Differential gearing, 27, 28; through hole, 29, 30; phototube detector.

Claims (1)

[Claims] 1. In a device in which a blade drive unit is attached to an endless blade equipped with a large number of tips, and the blade drive unit runs on a substantially elliptical track that combines a turn part and a straight track, the turn part A plurality of guide rotors are inscribed in the blade and rotated at the same speed as the blade, and a chip guide gap is formed on the circumferential surface of the guide rotor. 1. A blade holding device for a diamond tip band saw, characterized in that the blade is located in a guide gap. 2 A driving part is formed in an endless blade equipped with a large number of tips, and a plurality of guide rotors are inscribed in the turn part, a guide gap for the chips is formed on the circumferential surface of the guide rotor, and each guide rotation In a device in which the tip is positioned approximately at the center of the guide gap, the drive section of the blade and the drive section of the guide rotating body are rotationally driven by the same drive motor, and the drive section of both drive sections is driven by the same drive motor. A blade holding device for a diamond tip band saw, characterized in that one of the blades is connected to a control device for detecting and correcting a misalignment between the blade and a guide rotating body.