JPS6245179B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous cutting device for cutting long hard and brittle materials after forming rod-shaped glass or glass pipes, which are materials for gradient index lenses.

Traditionally, to manufacture rod-shaped glass, which is a material for gradient index lenses used in optical communication devices, etc., molten glass is formed into a rod-shape and pulled out from a crucible using a tension roll to solidify it. This rod-shaped glass is cut into a predetermined length, and the specific cutting means is a fixed blade and a sliding blade arranged so as to sandwich the rod glass and face each other.
The sliding blade is struck against the rod-shaped glass from a direction perpendicular to the rod-shaped glass, and the rod-shaped glass is cut by the shearing force caused by the impact. With such conventional cutting devices, the drawing of the rod-shaped glass stops momentarily during cutting, so vibrations are transmitted to the so-called soft molded brush inside the crucible, causing the brush to bend and bending the rod-shaped glass. Alternatively, it may cause non-uniformity in diameter.

Other cutting devices have a cutting blade fixed to a pair of rotating bodies and rotate these rotating bodies to force cut glass rods, but the cutting part is crushed and broken, and This will have the same negative effect on the shaped brush.

The present invention was developed in view of the above-mentioned conventional problems, and is capable of cutting long hard and brittle objects such as glass rods without applying vibration or bending force to the long hard and brittle objects. It is an object of the present invention to provide a cutting device that can continuously obtain elongated hard brittle materials having a uniform diameter and a constant length without bending.

In order to achieve this object, the continuous cutting device according to the present invention has a pair of rotating bodies arranged on the left and right sides around the long hard brittle material pulled out from inside the crucible, and one rotating body is rotated by an impact device. A cutting blade protruding outward in the radial direction of the body is provided, and the other rotating body is provided with a receiving member for the cutting blade, and each rotating body is used for drawing out long hard brittle materials at least for a certain period of time including cutting. The gist of this is that they rotate in synchronization.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view of a continuous manufacturing apparatus for rod-shaped glass to which a cutting device according to the present invention is applied, and the floor 1
A pedestal 2 is installed above, a furnace 3 is placed on this pedestal 2, and a platinum crucible 4 is set in this furnace 3. A nozzle part 4a is formed at the bottom of the crucible 4, and a hole 3a from which the nozzle part 4a faces is formed at the bottom of the furnace 3, and a heater 5 is buried in the hole 3a and the inner wall of the furnace 3. The molten glass 6 and the shaped brush portion 6a in the crucible 4 are heated and maintained at a constant temperature.

Further, a support plate 7 is installed on the upper part of the pedestal 2, and a pair of left and right measuring instruments 9, 9 for measuring the wire diameter of the rod-shaped glass 8 drawn and formed from the crucible 4 are fixed on the support plate 7. .

On the other hand, a support stand 10 is provided on the floor 1 in the frame 2, and a movable plate 11 that can be moved in the left-right direction is provided on this support stand 10. I'm trying to adjust it. A variable speed motor 13 with a speed reducer is fixed on the movable plate 11, and a tension roll 14 is fitted onto the drive shaft of this motor 13. Also, movable plate 1
A frame body 15 is fixed on top of the frame body 1, a sliding body 16 movable in the left-right direction is disposed within the frame body 15, and an idler roll 17 is fitted onto the shaft of this sliding body 16. A bracket 18 is attached to the frame 15, and a lever 19 is attached to the lower end of the bracket 18.
The proximal end of the lever 19 is pivotally connected, and a weight 20 is further suspended from the tip of the lever 19.

The weight 20 applies a force to the lever 19 to rotate it clockwise in the figure, and the protruding piece 19a formed at the base end of the lever 19 engages the pin implanted in the sliding body 16. 16a, the slider 16 and the idler roll 17 fitted to the shaft of the slider 16 are urged to the left in the figure.
A rod-shaped glass 8 is held between a tension roll 14 and an idler roll 17. And motor 1
By driving 3, the rod-shaped glass 8 is pulled out downward. Moreover, a bracket 2 is mounted on the frame 16.
1 is attached, and a ceramic plate is stacked on this bracket 21, and a member 22 with a hole formed in the center through which the rod-shaped glass 8 is inserted is provided. Even if this occurs, this is to prevent it from being transmitted to the forming brush 6a.

Further, another support stand 23 is installed on the floor 1 within the support stand 10, and a movable plate 24 is placed on this support stand 23.
The horizontal position of this movable plate 24 is adjusted using the adjuster bolt 25. And movable plate 24
As shown in FIG. 2 which is a plan view above, a small variable speed motor 26 with a reducer is fixed, a pulse generator 27 is attached to this motor 26, and a clutch is attached to the output shaft 28 of the motor 26.・Brake 2
A spur gear 30 is fitted through 9, and this spur gear 30
A shielding plate 31 is attached to the shaft, and a spur gear 30 and a spur gear 33 fitted on an idler shaft 32 are meshed with each other.

Then, rotating disks 34 and 35, which are rotating bodies, are attached to the spur gears 30 and 33.
As shown in the figure, three fixed blades 36, which are receiving members, are fixed to the rotating disk 34 with bolts 37 at equal angles apart, and in the fixed state, the cutting edges 36a protrude from the outer periphery of the rotating disk 34. I try to do that.

Further, as shown in FIG. 3, three cutting blades 38 are mounted on the rotating disk 35 at equal angular intervals and slidable in the radial direction in order to reduce wear and tear on the blades.

That is, as shown in FIG. 4, the cutting blade 38 has a protruding cutting edge 38a at its tip, and step portions 3 on both sides in the longitudinal direction.
9, 39, and a rod portion 40 at the rear end.
has been established.

On the other hand, a ring-shaped portion 4 is provided at the center of the rotating disk 35.
1 protrudingly provided, and 3 equally angularly spaced apart from each other in the radial direction of the rotating disk 35 on the outer side of the ring-shaped portion 41.
Grooves 42 of the book are formed radially, and these grooves 4
Slide guides 43, 43 are attached to both side edges of 2 with bolts 44 so that a part of the slide guides 43 is in the groove.

As shown in FIG. 5, which is a cross-sectional view taken along line A-A in FIG. It passes through the hole 41a and a part thereof faces inside the ring-shaped part 41. Further, with the cutting blade 38 fitted into the groove 42, the stepped portion 39 of the cutting blade 38 comes into contact with the inner surface of the slide guide 43,
The cutting blade 38 will not fall outward, and even if the rotating disk 35 rotates and the cutting blade 38 is positioned downward, a locking portion (not shown) formed on the slide guide 43 will prevent the cutting blade 38 from falling. is prevented.

Further, as shown in FIG. 2, a bracket 45 having an L-shaped plane is fixed to the movable plate 24, and a crank 47 is attached to the bracket 45 via a pin 46 so as to be swingable in a horizontal plane. A striker 48 facing into the ring-shaped portion 41 is formed at the tip of the short arm 47a of the crank 47, and a weight 49 for increasing the impact load is provided at the long arm 47b of the crank 47. A spring 50 is stretched between the bracket 45 and the crank 47, and the crank 47 is biased clockwise in FIG.
It is regulated by a stopper 51 attached to the tip of 5.

Furthermore, a solenoid 52 is installed near the stopper 51.
A cushion member 54 is attached to the spool 53 of the solenoid 52, and a spring 55 biases the solenoid 52 in the retracting direction.

Further, near the rotating disk 34, as shown in FIG.
When the light passes through the photoelectric switches 56 and 57, the brake clutch 29 is engaged and separated.

The operation of the apparatus constructed as above will be described below.

First, the horizontal positions of the movable plates 11 and 24 are adjusted so that the rod-shaped glass 8 passes through the midpoint between the tension roll 14 and the idler roll 17 and between the rotating disk 34 and the rotating disk 35.

After that, the rod-shaped glass 8 is pulled out from the crucible 4 using a seed glass, the rod-shaped glass 8 is held between the tension roll 14 and the idler roll 17, and the rod-shaped glass 8 is pulled out by driving the motor 13. Pull out 8 downward. In this case, motor 1
3 receives an output signal corresponding to the diameter of the rod-shaped glass 8 from the wire diameter measuring device 9, and its rotational speed is controlled so that the diameter is always uniform.

When the rod-shaped glass 8 passes through the cutting section and the pulse count number of the pulse generator 27 reaches a predetermined value, the clutch brake 29 connected to the constantly rotating motor 26 brakes. is demagnetized, the clutch is energized, and spur gear 3
0, 33 and the rotating disks 34, 35 attached to these spur gears start rotating. The direction of rotation of the rotating disk is as shown by the arrow in FIG.
The rotating disk 35 is rotated clockwise, and the rotating disk 35 is rotated counterclockwise.

Then, just before the fixed blade 36 fixed to the rotating disk 34 becomes perpendicular to the rod-shaped glass 8, the shielding plate 31 blocks the optical axis of the first photoelectric switch 56.
Then, the solenoid 52 shown in FIG. 2 is energized,
The spool 53 protrudes and hits the crank 47. As a result, the crank 47 instantaneously rotates counterclockwise in FIG. The rod-shaped glass 8 is then cut.

It is preferable that the positional relationship between the cutting blade 38 and the fixed blade 36 during cutting is such that the cutting blade 38 is located approximately 0.2 mm above. Further, the amount of biting of the cutting blade 38 into the rod-shaped glass 8 is approximately 5 mm. For this purpose, for example, the stroke of the solenoid 52 may be set to 25 mm, the distance between the tip of the spool 53 and the crank 47 may be set to 15 mm, and the cushion allowance may be set to 5 mm.

The fixed blade 36 and cutting blade 38 that cut the rod-shaped glass 8 as described above rotate together with the rotating disks 34 and 35, and when the shielding plate 31 blocks the optical axis of the photoelectric switch 57, the clutch brake 29 The clutch is demagnetized, the brake is energized, the rotation of the rotary disks 34 and 35 is stopped, and the process waits until the next disconnection.

Further, when the cutting blade 38 slidably attached to the rotating disk 35 is in the lower position, the cutting edge 38
a protrudes from the circumference of the rotating disk 35, but when it rotates to the upper position, the rotating disk 35 due to its own weight.
slides radially inward and becomes retracted.

Note that the above is only one embodiment of the present invention, and the present invention is not limited to the above. For example, in the embodiment, the case of cutting rod-shaped glass has been described, but pipe-shaped glass may also be used, and the present apparatus can also be applied to cutting materials other than glass, such as ceramics and resins. Further, in the embodiment, the feeding of the rod-shaped glass and the rotation of the rotary disk are synchronized for a certain period of time including the time of cutting, but they may be synchronized all the time.

Furthermore, although a fixed blade is provided as a receiving member, if the object to be cut has a small diameter, a flat receiving member without a cutting edge may be provided.

Furthermore, although the illustrated example shows an example in which the present invention is applied to a device that pulls rod-shaped glass downward, it can also be applied to a device that pulls rod-shaped glass upward.

As explained above, according to the present invention, a pair of rotating bodies is disposed in an apparatus for molding and manufacturing long hard brittle objects such as rod-shaped glass, and one rotating body is made to protrude by an impact device. The other rotating body is provided with a receiving member for the cutting blade, and while rotating these rotating bodies in the same direction as the direction in which the elongated hard and brittle material is pulled out, the cutting blade is protruded. Since the long hard and brittle material is cut instantly by the shearing force caused by the impact, the drawing of the long hard and brittle material is not stopped during cutting, and therefore the forming brush part Vibration is not transmitted. As a result, it is possible to continuously obtain elongated hard brittle materials of uniform diameter without bending at fixed length intervals, and the work efficiency is greatly improved, among other effects.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention,
Fig. 1 is a front view of a cutting device according to the present invention applied to a continuous manufacturing device for rod-shaped glass, Fig. 2 is a plan view of the main parts of the cutting device, and Fig. 3 is a main part of the cutting device. 4 is a side view of the cutting blade, and FIG. 5 is a sectional view taken along the line A-A in FIG. 3. In the drawing, 4 is a crucible, 6 is a hard brittle material in a molten state, 8 is a long hard brittle material, 14 is a tension roll, 17 is an idler roll, 34 and 35 are rotating bodies, 36 is a receiving member, and 38 is a cutting member. The blade 47 is an impact device.

Claims (1)

[Scope of Claims] 1. A cutting device that pulls out a molten hard and brittle material from a crucible, shapes it into a long shape, and continuously cuts the long hard and brittle material, the main body of the device includes a long A pair of left and right rotating bodies are arranged with the center line of the drawer for hard and brittle materials as a boundary, and a cutting blade that is protruded outward in the radial direction of the rotating body by an impact device is slidably attached to one of the rotating bodies. Further, the other rotating body is provided with a receiving member for the cutting blade, and further, each of the rotating bodies is configured to rotate in synchronization with the drawing of the long hard brittle material for at least a certain period of time including the time of cutting. A continuous cutting device for long hard and brittle materials. 2. The continuous cutting device for long hard and brittle materials according to claim 1, wherein the receiving member is a fixed blade fixed to the other rotating body. 3. The elongated hard brittle material according to claim 1, wherein a plurality of the cutting blades and the receiving member are each attached to a rotating body, and each of the cutting blades and the receiving member are spaced apart from each other by equal angles. Continuous cutting device.