JP2825539B2 - Method and apparatus for cutting continuous glass tube - Google Patents

Description

The present invention relates to a method and an apparatus for cutting a single continuous glass tube into pieces of a predetermined length. More specifically, a method for cutting a continuous glass tube that cuts a continuous glass tube moving along its own axis at a predetermined linear velocity into pieces of a predetermined length, using a rotary cutting tool for cutting, Further, the rotary cutting tool is provided with a cutter that advances along a circular orbit existing on a plane inclined with respect to the axis of the continuous glass tube and intersects the outer surface of the continuous glass tube at a part of the orbit. Also, when the cutter is in the portion of the trajectory, and the rotary cutting tool is driven at an angular speed named a synchronous speed in which the linear component of the speed of the cutter substantially matches the linear speed of the continuous glass tube. The cutting method of the continuous glass tube, wherein the outer surface of the continuous glass tube is cut by the cutter every one rotation of the rotary cutting tool. Further, a continuous glass tube cutting device for cutting a continuous glass tube moving along its own axis at a predetermined linear velocity along a towing line into pieces of a predetermined length, wherein a rotary cutting tool, Rotating means for rotating the rotary cutting tool, wherein the rotary cutting tool travels along a circular orbit present on a plane inclined with respect to the axis of the continuous glass tube, and at a part of the orbit. A cutter is provided to cross the outer surface of the continuous glass tube,
While the cutter is in the portion of the track, and while the rotary cutting tool is driven at an angular speed named a synchronous speed where the linear component of the speed of the cutter substantially matches the linear speed of the continuous glass tube The present invention also relates to a continuous glass tube cutting device for cutting the outer surface of the continuous glass tube by the cutter every one rotation of the rotary cutting tool.

<Prior Art> In a known cutting device, a rotating tool consists of a rotating arm lying on a vertical plane inclined at a small angle with respect to the axis of the continuous glass tube. A hard metal or ceramic tool is attached to the tip of the arm. This is for making a cut at a predetermined cut portion of the glass tube. While the glass tube advances, the arm holding the tool rotates at a constant speed around its own axis so that the component of the circumferential velocity in the axial direction of the glass tube is equal to the advance speed of the glass tube. It has become. As the tool holding arm rotates, the tool contacts the glass tube at a relative speed at right angles to its axis with each rotation. It is enough to make a small cut to start cracking the glass tube.

The tool obtains the driving force from the pulling device of the glass tube through transmission by a belt and a pulley. In order to change the cutting length, known devices require the following: One is to change the radius of the tool holding arm or change the transmission ratio between the traction device and the axis of the tool.
In practice, to do this, pulleys of various diameters suitable for the most common cutting lengths must be available. If cut lengths other than those most common are required, it is necessary to create a new set of pulleys suitable for it.

<Problems to be Solved by the Invention> An object of the present invention is to simply input data and change the cutting length arbitrarily in a very wide range, without stopping the line, and using mechanical parts. It is an object of the present invention to provide a method and an apparatus that do not adjust or exchange the power.

<Means for Solving the Problems> In order to achieve the above object, a method for cutting a continuous glass tube of the present invention includes a method of cutting a continuous glass tube moving along its own axis at a predetermined linear velocity to a predetermined length. A method for cutting a continuous glass tube to be cut into pieces, wherein a rotary cutting tool is used for cutting, and the rotary cutting tool has a circular orbit present on a surface inclined with respect to an axis of the continuous glass tube. And a cutter intersecting the outer surface of the continuous glass tube at a part of the track, and when the cutter is in the part of the track, and the linear component of the speed of the cutter is continuous. While the rotary cutting tool is being driven at an angular speed generally called a synchronous speed substantially matching the linear speed of the glass tube, the outer surface of the continuous glass tube is rotated by the cutter every one rotation of the rotary cutting tool. In the method of cutting a continuous glass tube, the synchronous cutting speed is given to the rotary cutting tool in a small portion of each rotation including the portion of the trajectory of the cutter, and in the remaining large portion of each rotation, During the next rotation, when the continuous glass tube has traveled a predetermined distance from the cut formed during the previous rotation, the rotary cutting tool is given an angular velocity so that the cutter reaches the starting point of the portion of the track. It is characterized by giving.

It is desirable that the rotary cutting tool is rotationally driven by its own speed change motor.

The angular velocity of the rotary cutting tool is periodically fluctuated, the amplitude of the angular velocity can be zero, and is directly proportional to the linear velocity of the continuous glass tube, and the frequency of the angular velocity can be zero. Preferably, it is directly proportional to a preset piece length.

 It is desirable that the angular velocity changes to a trapezoidal shape.

 It is desirable that the angular velocity changes in a sinusoidal manner.

Further, the continuous glass tube cutting apparatus of the present invention is capable of cutting a continuous glass tube that moves along its own axis at a predetermined linear velocity along a traction line into pieces of a predetermined length. An apparatus, comprising: a rotary cutting tool; and rotating means for rotating the rotary cutting tool, wherein the rotary cutting tool has a circular orbit present on a surface inclined with respect to an axis of the continuous glass tube. A cutter intersecting with the outer surface of the continuous glass tube at a part of the track while the cutter is in the part of the track, and when the linear component of the speed of the cutter is equal to the continuous glass. While the rotary cutting tool is being driven at an angular speed generally referred to as a synchronous speed substantially matching the linear speed of the tube, the outer surface of the continuous glass tube is cut by the cutter every one rotation of the rotary cutting tool. Therefore, in the continuous glass tube cutting device for cutting, the rotating means for rotating the tool, the rotary cutting tool rotates at the synchronous speed in a small portion of each rotation including the portion of the path of the cutter, In the remaining large portion of each revolution, during the next revolution, the cutter reaches the beginning of the trajectory portion when the continuous glass tube has traveled a predetermined distance from the cut made during the previous revolution. The rotary cutting tool is characterized by having control means for controlling the angular velocity of the rotary cutting tool in cooperation with each other so that the rotary cutting tool rotates at such an angular velocity.

Preferably, the rotating means for the rotary cutting tool is constituted by a speed change motor of the rotary cutting tool itself.

Preferably, the control means has input means for manually inputting a predetermined length of the piece in cooperation with the control means.

Further, a detecting means for detecting a linear velocity of the continuous glass tube and emitting a linear velocity signal, wherein the input means emits a delivery signal proportional to the length of the input piece, The control means controls the rotary cutting tool so as to periodically fluctuate the angular velocity of the rotary cutting tool, the amplitude of the angular velocity can be zero, and the linear velocity of the continuous glass tube is reduced. It is directly proportional, and the frequency of the angular velocity can be zero, and is preferably directly proportional to a preset piece length.

Further, it is desirable that the periodic change of the angular velocity caused by the control means is trapezoidal.

Further, it is desirable that the periodic change of the angular velocity caused by the control means is sinusoidal.

Preferably, the speed change motor is an electric step motor, and the control means applies a step pulse to the electric step motor whose speed changes in a manner similar to a periodic change in angular velocity.

Further, it is preferable that a detecting means for detecting an angular velocity of the rotary cutting tool is included, and the detecting means gives a feedback signal to the control means to perform self-adjustment.

Also, includes a structural member that supports the rotary cutting tool via a pair of intersecting slides in cooperation with the traction line of the continuous glass tube, wherein the position of the slides allows for fine adjustment, It is desirable that the position of the rotary cutting tool can be adjusted in a direction parallel to the continuous glass tube and in a radial direction of the continuous glass tube.

<Operation> The concept of the present invention is to provide a synchronous angular velocity to a rotary tool for a time slightly longer than the time required for making a cut. The desired cutting length is one of the tools at synchronous speed
Suppose it corresponds to rotation. In this case, the tool rotates constantly around its own axis at a synchronous angular velocity. However, if the desired cut length is longer than the cut length corresponding to this synchronization speed, the tool will slow down for most of its rotation and will probably stand still. Then, the cutter is accelerated again, and when the synchronous speed is reached, the cutter is located in the cutting area. At this time, the continuous glass tube has advanced this long cutting length. However, if the desired cut length is shorter than the cut length corresponding to the synchronous speed, the tool is accelerated for most of its rotation, and then decelerated back to the synchronous speed. As a result, the continuous glass tube has traveled the desired short cutting length when the cutter reaches the cutting area again.

Advantageously, according to the invention, these work cycles are performed by a control device. The control device is preferably a numerical control device, which need only be set by means of a setting device with wheels or a keyboard, the number corresponding to the desired cutting length.

<Example> Hereinafter, the present invention will be described in detail with reference to an illustrated example.

1 and 2, the tow line includes a tough column 10 supporting a tough horizontal cantilever 12. The free ends of the column 10 and the cantilever 12 support support brackets 14, 16, respectively. The support brackets 14 and 16 support the lower horizontal beam 18. The horizontal beam 18 is
It supports brackets 20, 22, 24 whose position is adjustable along 18.

The bracket 20 supports the grooved support roller 26.
The bracket 22 supports a grooved guide roller 28,
The bracket 24 supports the grooved support roller 30.

The continuous glass tube T is moved along its longitudinal axis by the rollers 20,3.
It moves above 0 and below the roller 22 in the direction of arrow A (FIG. 5).

The upper cantilever 12 acts as a guide for the slide 32. The slide 32 can be positioned and adjusted along the cantilever 12 by a lead screw 34 driven by wheels 36.

The slide 32 supports intersecting slides 38. The slide 38 is a lead screw driven by wheels 42
The position can be adjusted by 40.

The slide 38 supports a lower vertical arm 44, which supports a support bush 46.

In FIGS. 1, 2, 3, and 4, a horizontal shaft 48 is rotatably provided on the bush 46. The tool holding device 50 is connected to one end of the horizontal shaft 48 located above the roller 30 by a key. Electric motor 52 with flange (details will be described later)
Is fixed to the other end of the support bush 46. The shaft of the motor 52 is directly connected to the shaft 48.

The tool holding device 50 includes a clamp 54 for connecting to the shaft 48. A tool holding arm 56 is fixed to one end of the clamp 54 in the radial direction, and a balance weight 58 for balancing the tool holding arm 56 is fixed to the other end.

The arm 56 supports a hard metal or ceramic tool 60 at its free end. The tool 60 has a sufficiently sharp cutter 62 parallel to the axis of the shaft 48.

As will be described next, the cutter 62 has a cross cut on the surface of the glass tube T for starting crushing. Crushing occurs downstream of the traction device of FIG. 1 (not shown). The cut is formed in a wet state by sprinkling water on the tool 60 by a method not shown. In order to prevent water from spilling around,
Hood 64 covers.

The arrangement of the tool holding device 50 is not exactly shown in FIGS. 1 to 4, but is shown exactly in FIG. As can be seen from FIG. 5, the horizontal shaft 48 is provided so that the cutter 62 of the tool 60 moves along a circular orbit O existing on the plane P. The plane P is indicated by an arrow A
Is inclined with respect to the axis X of the glass tube moving in the direction of. The angle α of the plane P with respect to the axis X is preferably 16 °
It is.

The motor 52 rotates the tool holding device 50 in the direction of arrow B.

The height of the axis of the shaft 48 is adjusted by finely adjusting the position of the slide 38 according to the diameter of the glass tube T, so that when the tool 60 comes to the lowest position of the rotation position, the orbit O Intersects the outer surface of the glass tube T.

Adjusting the position of the slide 32 helps to position the cutting piece in phase with a collector (not shown) located downstream.
The phase setting is such that successive cutting pieces always enter the same position in the collector, independent of weight and inertia.

The glass tube T, its axis X, plane P, and angle α
It is shown again in the figure.

The cutting device is arranged such that the cutter 62 makes a transverse cut N in the tube T every one rotation (6th cutting device).
Figure). For this purpose, as shown in FIG. 5, when the tool 60 is in the cutting area, the tool 60 must have a tangential speed Vp at which the component Vs is equal to the moving speed of the glass tube T. The cut N is made by the lateral component Vt of the speed of the cutter 62.

When the tangential speed Vp of the cutter 62 satisfies all of the above conditions, the tool 60 and all of its assemblies have a certain angular speed (hereinafter referred to as synchronous speed ωs).

Next, the electric and electronic parts of the above device will be described with reference to FIG.

In FIG. 7, the motor 52 of the cutting device (tool holding device) 50 is a step motor, preferably having five phases and 250 motors.
Have steps. The shaft 48 of the motor 52 can rotate in quarter steps. This means that one revolution of the shaft 48 of the tool holding device 50 is divided into 1000 parts, that is, 1000 steps.

The electronic control unit 70 cooperates with the motor 52 to form the heart of the cutting device. The encoder 72 detects the angular velocity ω of the tool holding device 50 in cooperation with the control device 70. The encoder 72 generates a feedback signal and sends it to the controller 70 to cause the controller 70 to perform self-adjustment.

Another encoder 74 detects the moving speed of the glass tube T in cooperation with the wheels of the traction device 76 and sends a corresponding linear velocity signal to the control device 70.

The data input device 78 cooperates with the control device 70. This data input device 78 may consist of a digital setting device with wheels or a keyboard. The setting device 78 is for manually inputting a delivery signal proportional to a desired cutting length to the control device 70. actually,
The desired cutting length can be set directly, for example in millimeters (for example 600 to 3000 millimeters) by means of the keys of the setting device or the numbers indicated on the wheels.

When the desired cutting length is set, the controller 70 performs necessary calculations. This calculation is performed based on the linear velocity signal sent from the encoder 74 and the angular velocity of the tool holding device 50 given as feedback from the encoder 72.

As a result, the controller 70 sends a series of pulses to the motor 52. The speed of these pulses varies between a value corresponding to the synchronous angular speed ωs and a value corresponding to a low angular speed or a high angular speed up to zero depending on the situation.

Naturally, the linear velocity signal provided by the encoder 74 causes the controller 70 to adjust the values of ω and ωs according to the instantaneous linear velocity Vs so that the fluctuation of the instantaneous linear velocity Vs does not affect the cutting length. I have.

Hereinafter, a practical example will be described with reference to FIGS. 5 and 8.

In FIG. 5, the orbit O has three sectors I, II, I
II. Sector I is 300 of motor 52
In addition to the steps, sectors II and III each correspond to 400 steps of motor 52.

 The synchronous angular velocity ωs satisfies the following equation.

Here, R is the radius of the tool (FIGS. 3 and 4).

The controller 70 must apply this synchronous angular velocity ωs to the tool 60, rather than to the cutter 60, rather than to the cutter 60. This angular synchronization speed ωs is given at least in the region where the cut N is made, preferably in the trajectory portion S which starts and ends before and after the region (FIG. 6)
In is done. This part S coincides with the sector I. Alternatively, it is included in at least the sector I.

 The most usual linear velocity Vs is 30 to 300 m / min.

 To represent the above concept, assume the following.

Vs = 60 m / min = 1 m / sec; ωs = 12.56 rad / sec (equivalent to 2 revolutions / sec) R0.083 m = 83 mm Under these conditions, if the tool 60 rotates constantly at the synchronous speed ωs, Cuts are made every 0.5m. In other words, a 0.5 m piece is obtained.

If a longer piece is required, for example, the cutting length Lt
In the case of 1 m, this value (for example, 1000) is input from the keyboard, and the controller 70 generates a cycle as shown in FIG. 8A. The tool 60 is the highest point IV of its trajectory O (Fig. 5)
, The controller 70 sends a series of 400 pulses to the motor 52 step by step faster to accelerate the speed of the motor 52, and when it reaches the starting point of the sector I, the synchronous speed ωs. Over the entire sector I, the controller 70 continuously sends 300 pulses to the motor 52 at a constant speed to rotate the motor 52 at a synchronous speed ωs along the entire sector I. After that, the control device 70 gradually reduces the speed by 400 pulses while the motor 5
2 and the motor 52 is decelerated. The motor 52
Stop at V. To perform a new cut or cut cycle, controller 70 restarts motor 52 and accelerates again along sector III. The cycle is repeated in this way.

Naturally, the part of the sector III must pass through so that the glass tube T has moved the desired cutting length, in this case 1 m, before the tool 60 reaches the cutting area. No.

FIG. 8b is a graph corresponding to a cut length Lt of 0.8 m. In this case, there is no pause at point IV. The motor 52 decelerates to zero in sector II and then immediately accelerates in sector III.

FIG. 8c shows the case where the cutting length Lt is 0.65 m. In this case, between the two cuts, the tool 60 decelerates along sector II and now accelerates along sector III without stopping at point IV.

As described above, if the cutting length Lt is 0.5 m, the tool 60 rotates at a constant speed. That is, the line in the graph coincides with the straight line of the ordinate ωs.

FIG. 8d shows a case where the cutting length Lt is 0.4 m. This means that the tool 60 must also have a synchronous speed ωs in sector I, while accelerating in sector II and decelerating in sector III.

Of course, there is a lower limit for the cutting length. This is because it is impossible to accelerate the motor 52 above a certain critical speed. That is, it is impossible to make the distance between the portions at the level ωs in FIG. 8d shorter than a certain limit.

As can be seen from FIG. 8, the control of the motor 52 involves a periodic change in the angular velocity of the tool. Its amplitude, which may be zero, is directly proportional to the linear velocity of the glass tube, and its frequency, which may be zero, is the batch signal input via the cutting length or setting device 78. Is proportional to

According to FIG. 8, the controller 70 periodically changes the angular velocity to draw a trapezoidal line. With this method, the controller 70 can be formed with very simple electronic devices, but there may be a problem that the acceleration and deceleration are too rapid and harm mechanical parts of the device.

Therefore, a more satisfactory method is to generate a series of pulses for controlling the motor 52 by the controller 70 so as to change the angular velocity in a substantially sinusoidal manner.

This second method is shown in FIG.
b, c, d correspond to a, b, c, d in FIG. 8, respectively.

As described above, according to the method of FIG. 9, since the acceleration and the deceleration are performed without interruption, the stress applied to the mechanical part of the device is reduced.

[Brief description of the drawings]

FIG. 1 is a partial side view of a drawing line of a glass tube provided with a cutting device according to the present invention, FIG. 2 is a partial cross-sectional front view of the II-II plane of FIG. 1, and FIG. 3 is a circle of FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3;
FIG. 5 is a perspective view showing a main part of the apparatus shown in FIGS. 3 and 4, FIG. 6 is a plan view showing a cut in the glass tube, and FIG. FIG. 8 a, b, c, and d are the graphs showing the portion, and the horizontal axis represents the cutting length and time, and the vertical axis represents the angular velocity of the cutting device.
Graphs for four different cutting lengths under the control of giving trapezoidal traces, FIGS. 9a, b, c, d are graphs similar to FIGS. 8a, b, c, d, respectively, and give approximately sinusoidal traces. It is a graph concerning control. T: continuous glass tube, 48: shaft, 50: tool holding device,
52 Step motor, 56 Arm, 60 Tool, 62
…… Cutter, 70 …… Control device, 72,74 …… Encoder, 78 …… Data input device.

Claims (14)

(57) [Claims] A method for cutting a continuous glass tube which cuts a continuous glass tube (T) moving along its own axis (X) at a predetermined linear velocity (Vs) into pieces of a predetermined length. The rotary cutting tool (60) is used for cutting, and the rotary cutting tool (60) exists on a plane (P) inclined with respect to the axis (X) of the continuous glass tube (T). A cutter (62) is provided along the circular orbit (O) and crossing the outer surface of the continuous glass tube (T) at a part (S) of the orbit, and the cutter (62) is provided on the orbit of the orbit. The rotational cutting at the angular velocity (ωs) named the synchronous velocity when the linear component (Vs) of the speed of the cutter (62) substantially coincides with the linear velocity of the continuous glass tube (T) when it exists in the portion (S). While the tool (60) is being driven, the outer surface of the continuous glass tube (T) is A method for cutting a continuous glass tube which is cut by the cutter (62) for each rotation of a rolling cutting tool (60), comprising: a small portion of each rotation including the portion (S) of a track (O) of the cutter (62); In (I), the synchronous cutting tool (60) is given the synchronous speed (ωs), and in the remaining large portion (II, III) of each rotation, the continuous glass tube (T ) Moves a predetermined distance from the cut (N) formed during the previous rotation, so that the cutter (62) reaches the starting point of the track portion (S) so that the rotary cutting tool (60) A method for cutting a continuous glass tube, wherein an angular velocity (ω) is given to the continuous glass tube. 2. The method according to claim 1, wherein said rotary cutting tool (60) is rotationally driven by its own variable speed motor (52). 3. The method according to claim 1, wherein
A periodic fluctuation is given to the angular velocity (ω) of the rotary cutting tool (60), and the amplitude of the angular velocity can be zero,
A method characterized in that the linear velocity (Vs) of the continuous glass tube is directly proportional to the linear velocity (Vs), and the frequency of the angular velocity can be zero, and is directly proportional to a preset piece length (Lt). 4. The method according to claim 3, wherein said angular velocity (ω) changes in a trapezoidal shape. 5. The method according to claim 3, wherein said angular velocity (ω) varies sinusoidally. 6. Continuous cutting of a continuous glass tube (T) moving along its axis (X) at a predetermined linear velocity (Vs) along a traction line into pieces of a predetermined length (Lt). An apparatus for cutting a glass tube, comprising: a rotary cutting tool (60); and rotating means (52) for rotating the rotary cutting tool (60). It travels along a circular orbit (O) existing on a plane (P) inclined with respect to the axis (X) of the glass tube (T), and at a part (S) of the orbit, the outer surface of the continuous glass tube (T). A cutter (62) intersecting with the above-mentioned cutter (6) is provided.
2) is present in the portion (S) of the track, and the linear velocity (Vs) of the speed of the cutter (62) is substantially equal to the linear velocity of the continuous glass tube (T). While the rotary cutting tool (60) is driven at (ωs), a continuous cutting of the outer surface of the continuous glass tube (T) by the cutter (62) for each rotation of the rotary cutting tool (60). In the apparatus for cutting a glass tube, a rotating means (52) for rotating the tool is provided in a small portion (I) of each rotation including the portion (S) of the trajectory (O) of the cutter (62). Rotary cutting tool (6
0) rotates at the synchronous speed (ωs), and in the remaining large portion (II, III) of each rotation, during the next rotation, the continuous glass tube (T) is cut at the notch formed during the previous rotation. When a predetermined distance has passed from (N), the cutter (6
2) cooperate with each other so that the rotary cutting tool (60) rotates at an angular velocity (ω) such that the rotation cutting tool (60) reaches the starting point of the track portion (S). A continuous glass tube cutting device, characterized by having a control means (70) for controlling the glass tube. 7. The apparatus according to claim 6, wherein the rotating means (52) for the rotary cutting tool (60) is constituted by a speed change motor (52) of the rotary cutting tool (60) itself. An apparatus characterized by the above. 8. The device according to claim 6, wherein
The control means (70) cooperates with the control means to manually input a predetermined length (Lt) of the piece (7).
8) A device characterized by having: 9. The apparatus according to claim 8, further comprising a detecting means (74) for detecting a linear velocity (Vs) of said continuous glass tube (T) to generate a linear velocity signal, and said input means (78). Emits a delivery signal proportional to the length (Lt) of the input piece, and the control means (70) periodically changes the angular velocity (ω) of the rotary cutting tool (60). The rotary cutting tool (60) is controlled to fluctuate, and the amplitude of the angular velocity can be zero, and is directly proportional to the linear velocity (Vs) of the continuous glass tube. A device wherein the frequency can be zero and is directly proportional to the preset piece length (Lt). 10. Apparatus according to claim 9, wherein the periodic change of the angular velocity (ω) caused by the control means (70) is trapezoidal. 11. Apparatus according to claim 9, wherein the periodic change in angular velocity (ω) caused by said control means (70) is sinusoidal. 12. The apparatus according to claim 8, wherein the speed change motor (52) is an electric step motor, and the control means (70) determines that the speed changes periodically with the angular speed (ω). An apparatus characterized in that a similarly varying step pulse is applied to the electric step motor. 13. An apparatus according to claim 6, further comprising detecting means (72) for detecting an angular velocity of said rotary cutting tool (60), wherein said detecting means (72) comprises said control means (72). 70) A device characterized in that a self-adjustment is performed by giving a feedback signal to (70). 14. Apparatus according to claim 6, wherein said continuous glass tube (T) cooperates with said traction line via a pair of intersecting slides (32, 38). Including a structural member (12) for supporting the rotary cutting tool (60), the position of the slide (32, 38) can be finely adjusted, and the position of the rotary cutting tool (60) can be adjusted to the continuous glass tube ( An apparatus characterized in that it can be adjusted in a direction parallel to T) and in a radial direction of the continuous glass tube (T).