JPS5813303B2 - belt type cutting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reciprocating belt type cutting machine.

Conventionally, one type of this type of belt-type cutting machine is one in which an endless belt is wound around two cylinders and rotates in only one direction, and a workpiece is pressed against the endless belt and cut.

In order to improve cutting accuracy in this type of belt, it is necessary that the joint part of the endless belt has the same thickness as the other parts and has uniform mechanical properties.

However, in order to endlessly bond thin belts with high tensile strength, special welding, post-welding rolling and heat treatment using a special rolling machine are required, which has the disadvantage of being extremely expensive.

Another type of device is a device in which a belt is stretched up within a frame by applying tension to both ends, and the frame is reciprocated to cause the belt to move back and forth, and the workpiece is pressed against the belt and cut. However, in this case, if an attempt is made to improve efficiency by increasing the distance traveled per second, there is a drawback that the device becomes extremely large.

On the other hand, if the stroke is made smaller and the cutting is performed at a lower speed, the accuracy will be better, but the efficiency will be lower.

In view of the above-mentioned points, the present invention is a belt-type cutting machine that can perform high-precision cutting with high efficiency using a belt-shaped blade with ends that can be manufactured at low cost, and can also be manufactured in a small size. The drawings will be described in detail below.

1 to 3 show an embodiment of the present invention, in which 1 is a belt-shaped blade, 2 and 2' are belt-shaped blades 1 whose axes are parallel to each other and have the same diameter; A cylinder with a fixed axis that allows the sides to be wrapped around;
3 and 3' are the first and second cylinders, respectively, which are integrally fixed with the cylinders 2 and 2' and have equal pitch circles and modules.
The gear 4 meshes with both the first gear 3 and the second gear 3', and a third gear with a fixed axis having the same module as these gears 3 and 3', and 5 and 5' each have a belt shape. Fixtures of each end of the blade 1 to the curves of the cylinder 2,z.

6 and 6' are cylinders 2 and guide wheels for fixed axes of belt-shaped blades having equal diameters and having axes parallel to the axes of these cylinders 2 and 2' on one side of a plane containing the two axes of the cylinders 2; , 10 is a workpiece cutting device disposed between both guide wheels 6, 6'.

7 is a mechanism for periodically reversing the direction of rotation of the cylinders 2 and 2', and is shown in FIG.
, 2' are coaxially connected and rotate together, and 9 meshes with the fifth gear 8'.
gear 8' and the sixth fixed axis of the mosule with equal pitch circles.
The gear 11 is a seventh gear that is directly connected to the rotational drive shaft and meshes with the fifth gear 8 and the sixth gear 9, and the first gear 8 and the sixth gear 9 mesh at the same time. It has teeth only in the area smaller than a semicircle so that there is no

FIG. 2 is a detailed view showing the state in which the belt-like blade 1 is wound around the cylinder 2, and 12 is a detailed view showing the state in which the belt-like blade 1 is wound around the cylinder 2.
13 is an abrasive fixing portion provided on both sides of the same end, 21 is a flange provided at both ends of the cylinder 20, and 22 is a notch provided at one end of the circumferential surface of the cylinder 2. formed,
The depth of the notch 12, which is a groove to prevent the grain fixing part 13 from coming into contact with the belt-shaped blade 10 and being crushed, is selected to be slightly larger than the width of the groove 22.

In practice, the depth of the notch 12 is extremely small compared to the width of the belt-like blade 1.

The cylinder 2' and the guide rings 6, 6' are also provided with a groove similar to the groove 22 and a flange similar to the flange 21.

Note that the cylinders 2, 2' and one flange of the guide rings 6, 6' are not shown in FIG.

FIG. 3 shows the state in which the belt-shaped blade 1 is fixed to the cylinder 2, where 23 is a bamboo provided on the cylinder 2, 51 is a fixture main body, and 52
53 is a bolt for fixing the fixed body 51 to the cylinder 2; 53 is a round bar for pushing the belt-like blade 1 into the groove 23; 54
is a screw into which the round bar 53 is pushed.

Hold the end of the blade 1 with the fixture body 51 and attach the port 5.
2, and by screwing in the screw 54, the blade 1 is pushed into the groove 23 through the round bar 53, and the blade 1 is tensioned.

The cylinder 2' and fixture 5' have similar structures. Next, to explain the operation of the device of the present invention, first, the belt-shaped blade 1 is wound around the guide wheels 6, 6', and is wound around the cylinders 2, 2' so that the length is longer than the reciprocating stroke, and both ends are fixed. It is fixed by means of tools 5 and 5' and tension is applied by screwing in the screw 54.

At this time, the first gear 3, 3' and the third gear 4
Since they are in mesh, the blade 1 is maintained wrapped around the cylinder 2, z and the guide wheels 6, 6'.

Now, when the seventh gear 11 is rotated in one direction by the drive source, in the state where the fourth gear 8 is meshing with the seventh gear 11 and rotating, the first and sixth gears 9 are rotated to the seventh gear 11. Therefore, this sixth gear 9 and the fifth gear 11 do not mesh with each other.
The gear 8' is released from driving, and the sixth gear 9,
When the fifth gear 8' is driven, the fourth gear 8'
is released from the drive, so the cylinders 2 and 2' alternately
The belt-shaped blade 1 reciprocates as it is driven and periodically reverses its rotational direction.

By driving the seventh gear 11 with a constant velocity drive source, the constant velocity movement time of the blade increases except when the blade is reversed, and cutting can be made more efficient.

In this state, when the workpiece is fixed to the workpiece cutting device 10 and pressed against the blade 1, the workpiece is cut.

At this time, the blade 1 receives a force in its width direction, but the cylinders 2, 2' and the nolanges 2 provided on the guide wheels 6, 6'
1 prevents it from coming off the cylindrical surface and prevents the brake from coming off.
Since the blade 1 is provided with a notch 12 that is larger than the width of the groove 22, even if tension is applied to the blade 1, the abrasive grain fixing portion 13 will not bend inward of the winding circles 2, 2'. There's nothing to do.

The transmission of force from the cylinder on the driving side of the cylinder 2.2' to the cylinder on the driven side depends not only on the belt tension, but also on the first gear 3, the third gear 4, and the third gear. 2 gear 3
Since the belt-shaped blade 1 is moved by the tension force 1, the additional tension applied to the belt-shaped blade 1 during the movement other than the tension applied to the belt-shaped blade 1 is extremely small, and is only increased due to the drive caused by friction with the guide wheels 6, 6'.

Therefore, most of the impact force when the belt-shaped blade 1 is reversed is received by the gear, and there is little variation in the tension of the blade.

Therefore, by fixing both ends of the belt-shaped blade at a considerable speed by a drive source that rotates in one direction, and by using two cylinders 2 and 2' instead of one to wrap a part of the grade, the stroke of the blade can be divided. Reduce the cylinder diameter to
As a result, the blade can be moved at high speed with a low-output drive source, and hence a small drive source.

If the distance between the plane containing both axes of the cylinders 2 and 2l and the plane containing both axes of the guide rings 6 and 6', and the distance between both the guide rings 6 and 6' are increased, cutting will be easier. There are no essential restrictions on the dimensions of the workpiece to be processed.

Note that if it is necessary to alleviate the impact caused by the inertia of the rotating system due to the change in meshing of the seventh gear 11, a shock absorber using the restoring force of a spring may be inserted.

As described above, the present invention uses a belt-like blade with ends that can be manufactured at low cost, and the belt-like blade is installed on one side of a plane that includes both axes of both cylinders around which the belt-like blade is fixedly wound. Since there are two guide wheels to be rotated, and a workpiece cutting device is provided between these two guide wheels, the length of the belt-shaped blade that spans between these two guide wheels is equal to the total length of the belt-shaped blade. Since it can be made shorter than the guide wheels, the lateral rigidity of the belt-shaped blade between both guide wheels is increased, and as mentioned above, the tension fluctuation of the belt-shaped blade is small, which suppresses self-excited oscillation. This makes it possible to increase the cutting accuracy of the workpiece.

Furthermore, since the tension fluctuation of the belt-shaped blade is small, the blade can be reciprocated at a considerable speed, and processing efficiency can be increased.

Furthermore, as described above, the belt-shaped blade is wound around a plurality of guide rings arranged on one side of a plane containing both axes of two fixedly wound cylinders, so that only the belt-shaped blade is caused to reciprocate. This allows the entire cutting machine to be made smaller.

Furthermore, from the above, when used to cut expensive crystalline materials whose quality cannot be maintained due to heat generation when cutting at extremely high speeds, high-precision, high-quality cutting can be carried out quite efficiently, and belt-like grades can also be used. Since each end is fixed to two cylinders and a part of the cylinders is wound around them, the diameter of these cylinders can be made small in relation to the stroke of the belt-like blade, and therefore the drive source has a relatively small output and is therefore compact. This has the advantage of increasing the speed of the blade and making the entire device more compact.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, and FIG.
1 is a plan view of the reciprocating part of the belt-shaped blade, FIG. FIG. 3 is a side view of the belt-shaped blade fixing portion to the cylinder. 1...Belt plate, 2, 2'...
Cylinder with belt-like blade fixedly wrapped around it, 3...First gear, 3'...Second gear, 4...Third gear, 6, 6'. ...Guide wheel, 7...
・Mechanism for periodic reversal of the rotational direction of the cylinder around which the belt-like blade is fixedly wound, 10... Workpiece cutting device.

Claims (1)

[Claims] 1. Two cylinders with the same diameter, whose axes are fixedly arranged in parallel, each end of a belt-shaped blade is fixed on the circumferential surface, and a part of the blade can be wound around, and each of these two cylinders is concentric. first and second gears of the equal diameter module integrally connected to each other; a third gear that meshes with the first and second gears simultaneously and has a fixed axis; and the shafts of the two cylinders. A plurality of guide wheels having fine points parallel to the center and arranged on one side of a plane passing through the two axes of the two cylinders, the axes of which are fixed, and around which the belt-shaped blade is wound, and the direction of rotation of the two cylinders. A belt-type cutting machine characterized by comprising a mechanism for periodically reversing the belt.