JPH05139754A - Gob forming device - Google Patents

Abstract

PURPOSE:To stably form gobs of different weights as gobs of a prescribed weight at each of respective timings. CONSTITUTION:The gob forming device forms the gob by extruding the molten glass in a spout 1 by a linearly moving plunger and cutting this glass by a shear 3. A timing signal generating means outputs the operation start signals for a plunger driving means and a shear driving means at the prescribed timing. A plunger control means stores the data on the position of the plunger over the entire range in the linear moving direction of the plunger into a memory 81. A plunger control means 8 reads out the data on the position of the plunger in order of addresses from a memory 81 and outputs the data to the plunger driving means at the point of the time when the operation start signal of the plunger driving means is outputted from the timing signal generating means. As a result, the fluctuations in the timing for starting the plunger operation are drastically decreased and the fluctuation in the gob weight is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gob generating device for generating a gob having a predetermined weight by pushing molten glass in a spout with a plunger.

[0002]

2. Description of the Related Art As a glass molding machine for mass-producing glass products, a glass product having a desired shape is molded by press working (tableware molding machine, ashtray molding machine, etc.), press blow type or blow blow type molding. There are an independent section type (IS type) glass bottle molding machine having a plurality of sections, a molding machine for molding a cup by a press blow system, a molding machine for a thin cup by a blow system, and the like.

These glass forming machines finish a glass product of a desired shape by directly press-molding a gob having a weight corresponding to the shape and size of the glass product, or a parison obtained by press molding or blow molding. The final glass product is produced by finishing the glass product with a desired shape by blow molding a semi-finished product called.

In such a glass molding machine, it is necessary that a gob whose weight is stable is constantly supplied to the molding machine.
Because, if the weight of the gob is different, the thickness and shape of the press-molded glass product itself may be different, or it may stick out.
Defects such as insufficient output occur, and in blow-blown products, it causes fluctuations in wall thickness, which causes fluctuations in the internal volume of the product. In some cases, a thin part was formed, which significantly deteriorated the product strength. Therefore, suppressing the fluctuation of the gob weight,
By constantly controlling the weight of the gob supplied to each molding machine, it is possible to significantly suppress the occurrence of defects in the glass product and improve the productivity of the glass product.

On the other hand, the conventional gob generator produces a gob having a predetermined weight by pushing the molten glass in the spout out of the orifice with a plunger that moves linearly and cutting the pushed molten glass with a shear. In order to keep the weight of the gob constant, the shear must perform the cutting operation in synchronization with the pushing operation of the plunger. In the past, the movements of the plunger and shear were controlled by the coupling of mechanical elements such as cams, so once the coupling state of the mechanical elements is set, the timing of the plunger and shear movements will be constant, thus stabilizing the weight. I was able to supply the gob that I made.

If only a gob having the same weight is always supplied as in the conventional case, the gob may be generated by controlling the operation of the plunger and the shear by coupling the mechanical elements. However, if it is necessary to change the weight of the gob due to a change in the production line, the conventional gob generator requires a lot of time to adjust the operation timing after changing the cam, etc. It was very difficult to flexibly change the production line.

Therefore, recently, a gob generating device has been developed in which the operation of the plunger and the shear and the operation timing thereof are electrically controlled so that the gobs having different weights can be sequentially supplied. In this electric control type gob generator, a servomotor is used as a driving means for the plunger and a fluid pressure cylinder is used as a shearing means, and the sequence of operations of the servomotor and the fluid pressure cylinder is controlled by a sequencer. The NC device controls the moving position and moving speed.

That is, the conventional electrically controlled gob generator uses a three-axis control NC device to determine the stroke position of the plunger that moves vertically and the direction and speed of rotation of the plunger. A predetermined amount of molten glass is extruded from the spout by controlling according to the control signal from the sequencer. Then, the extruded molten glass is cut by a shear that operates according to a control signal from the sequencer. As a result, the gob generator can successively generate gobs having different weights.

[0009]

However, in the conventional electric control type gob generator, the sequencer operates in synchronization with the timing signal output from the program counter, and outputs a series of sequence signals to the NC device. However, the NC device controls the stroke and rotation of the plunger based on this sequence signal.

Therefore, even though the program counter regularly outputs the plunger operation start signal and shear operation start signal at a constant timing, each response is different due to the difference between the operation cycle of the sequencer and the operation cycle of the NC device. The time varies. As a result, the time from when the timing signal is output from the program counter to when the plunger and shear actually start varies for each timing signal, the amount of molten glass extruded from the spout is not stable, and Since the shear cutting timing also varies, the electrically controlled gob generator can sequentially generate gobs with different weights, but the weight of the generated gobs is unstable and unstable. I had the problem that it was not the target.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a gob generator capable of stably generating gobs having different weights as gobs having a predetermined weight at each timing. To do.

[0012]

A gob generator according to the first aspect of the present invention comprises a spout for storing molten glass, a plunger for linearly moving in the spout to push the molten glass out of the spout, and the plan. Plunger drive means for inputting plunger position data in the linear movement direction of the jar and drivingly controlling the plunger based on the data, and the melting provided in the spout and extruded from the spout by the linear movement of the plunger. An orifice for controlling the diameter of the glass, a shear for cutting the molten glass extruded from the orifice, a shear driving means for driving and controlling the shear, an operation start signal for the plunger driving means and the shear driving means are predetermined. Timing signal generating means for outputting at the timing of The plunger position data covering the entire range of the linear movement direction of the runner is stored in a memory, and the plunger position data is read from the memory in response to the operation start signal from the timing signal generating means and the plan is set. And a plunger control means for outputting to the jar drive means.

The gob generating device of the second aspect of the present invention is a spout for storing molten glass, a plunger for linearly moving in the spout to push out the molten glass from the spout, and a linear movement direction of the plunger. Plunger drive means for detecting a current position, inputting plunger position data in the linear movement direction, and drivingly controlling the plunger based on the current position and the plunger position data, and a spout provided on the spout. ,
An orifice that controls the diameter of the molten glass that is extruded from the spout by the linear movement of the plunger, a shear that cuts the molten glass that is extruded from the orifice, a shear drive means that drives and controls the shear, and the plan Timing signal generating means for outputting an operation start signal of the jar driving means at a predetermined timing, and the plunger position data over the entire range of the plunger in the linear movement direction are stored in a memory, and the timing signal generating means is stored. From the plunger control means for reading the plunger position data from the memory according to the operation start signal from and outputting the plunger position data to the plunger drive means, and inputting the current position output from the plunger drive means, Shear drive means based on this current position It is those composed of a shear start signal generation means for outputting an operation start signal.

The gob generating device of the third aspect of the present invention is a spout for storing molten glass, a plunger for linearly moving in the spout to push out the molten glass from the spout, and a linear movement direction of the plunger. Plunger driving means that inputs plunger position data and drives and controls the plunger based on the data, and the diameter of the molten glass that is extruded from the spout by linear movement of the plunger is controlled. An orifice, a shear for cutting the molten glass extruded from the orifice, a shear drive means for inputting shear position data in the linear movement direction of the shear, and drive control of the shear based on the shear position data, and the plunger drive means. The operation start signal of is output at a predetermined timing Timing signal generating means, the plunger position data and the shear position data over the entire range of the plunger in the linear movement direction are stored in a memory, and the timing signal generating means responds to the operation start signal from the timing signal generating means. And the plunger control means for simultaneously reading the position data and the shear position data from the memory and outputting them to the plunger drive means and the shear drive means.

[0015]

The spout is a tank for storing a predetermined amount of molten glass, and has an opening on the lower side. The opening is provided with an orifice that determines the diameter of the molten glass extruded from the spout. The plunger moves linearly in the spout to push the molten glass out of the spout (orifice). The plunger driving means inputs the plunger position data in the linear movement direction of the plunger, and drives and controls the plunger based on the data. The shear cuts the molten glass extruded from the orifice by the linear movement of the plunger. The shear drive means drives and controls the cutting operation of the shear. A general gob generator is configured in this way.

In the first aspect of the present invention, the timing signal generating means outputs the operation start signals of the plunger driving means and the shear driving means at a predetermined timing, and the plunger control means covers the entire range of the linear movement direction of the plunger. Plunger position data is stored in the memory, the plunger position data is read from the memory in response to the operation start signal from the timing signal generating means, and is output to the plunger driving means.

As described above, the plunger control means, when the operation start signal of the plunger drive means is output,
Since the plunger position data is read out from the memory in the order of addresses and output to the plunger driving means, there is no need to perform calculation in the conventional NC device, and the control cycle time can be executed in a short cycle time of the memory read cycle. The variation in the plunger operation start timing can be greatly reduced. As a result, according to the first aspect of the present invention, since the shear cutting operation can be performed at a stable timing with respect to the linear movement operation of the plunger, it is possible to prevent the weight of the gob from varying.

In the second aspect of the present invention, the plunger driving means detects the current position of the plunger in the linear movement direction, inputs the plunger position data in the linear movement direction, and based on the current position and the plunger position data. Drive control the plunger. The timing signal generating means outputs an operation start signal of the plunger driving means at a predetermined timing. The plunger control means stores the plunger position data in the memory over the entire range of the linear movement direction of the plunger, and reads the plunger position data from the memory in response to the operation start signal from the timing signal generating means and Output to the driving means.

As described above, the plunger control means only drives the plunger drive means by reading the plunger position data from the memory in the order of addresses and outputting the plunger position data to the plunger drive means when the operation start signal of the plunger drive means is output. Means drive control the plunger in a linear direction. Therefore, the second aspect of the present invention does not need to be calculated by the conventional NC device as in the first aspect of the present invention, and the control cycle time can be executed in a short cycle time of the memory read cycle. It is possible to drastically reduce the variation.

On the other hand, the shear start signal generating means inputs the current position output from the plunger driving means and outputs an operation start signal of the shear driving means based on this current position. Therefore, even if the operation start timing of the plunger varies to some extent, the shear cutting operation timing is always constant with respect to the linear movement operation of the plunger, so that the shear cutting timing does not vary. According to the second aspect of the present invention, since the linear movement operation of the plunger and the shearing operation of the shear can be performed in perfect synchronization, it is possible to prevent the weight of the gob from varying.

In the third aspect of the present invention, the timing signal generating means outputs the operation start signal of the plunger driving means at a predetermined timing, and the plunger controlling means outputs the plunger position data over the entire range of the linear movement direction of the plunger. Also, the shear position data is stored in the memory, and the plunger position data and the shear position data are read from the memory according to the operation start signal from the timing signal generating means and output to the plunger driving means and the shear driving means.

As described above, the plunger control means reads the plunger position data and the shear position data from the memory in the address order at the time when the operation start signal of the plunger drive means and the shear drive means is output, and the plunger drive means and It only needs to output to the shear drive means. Therefore, the third aspect of the present invention does not need to be operated by the NC device as in the first aspect of the present invention, and the control cycle time can be executed in a short cycle time of the memory read cycle. According to the third aspect of the present invention, since the plunger and the shear always operate in synchronization with each other, it is possible to more reliably prevent the change in the weight of the gob.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration of the overall configuration of the gob generator of the present invention. In this embodiment, only the gob generating means is shown, and the configurations of the gob distributing means, the glass molding machine and the like are omitted. Further, in the present embodiment, a case is described in which one gob generation device sequentially generates four types of gobs having different weights.

The spout 1 is a tank for storing molten glass. The spout 1 always stores a predetermined amount or more of molten glass in order to continuously supply the gob to the glass forming machine through the gob distributing means. Therefore, new molten glass is supplied from the furnace so that the amount of molten glass in the spout 1 is maintained at a predetermined amount.

In the present embodiment, a thermocouple is provided in the spout 1 for measuring the temperature Tg of the molten glass in the spout 1, and a liquid surface utilizing a float is used for measuring the liquid surface height Hg of the molten glass. A sensor is provided on the side wall of the spout 1.
The illustration of these sensors is omitted. When the liquid level height Hg from the liquid level sensor falls below a predetermined value, new molten glass is supplied from the furnace.

The orifice 2 determines the diameter of the molten glass extruded from the spout 1, and is attached near the lower outlet of the spout 1. The diameter of the gob can be set to an arbitrary value by changing the diameter of the orifice 2. In this embodiment, a single orifice having one opening is shown. Needless to say, a double orifice having two openings may be used.

The shear 3 cuts the molten glass extruded from the orifice 2 and determines the length of the gob, that is, the weight of the gob. Therefore, the weight of the gob can be appropriately controlled by adjusting the timing of the gob cutting operation by the shear 3.

When the orifice 2 is a double orifice, the shear 3 is provided for each opening, and the gob cutting operation timing of the shear 3 provided in each opening is controlled separately. This means that when the orifice 2 is a double orifice, the same amount of molten glass must be extruded from the two openings, but when the center position of the double orifice and the center position of the plunger 5 do not match, respectively, This is because the amount of molten glass extruded from the opening is different. Therefore, by separately controlling the timing of the gob cutting operation of the shear 3, it is possible to mold the gobs having the same weight from the molten glass extruded from the respective openings. Needless to say, conversely, the cutting operation timing of the shear 3 may be positively changed to generate gobs having different weights.

The plunger 5 rotates at a speed according to its stroke position, and adjusts the flow of the molten glass in the spout 1 to the orifice 2 according to its rotation direction (clockwise or counterclockwise) and its rotation speed. However, the amount of molten glass extruded from the opening of the orifice 2 is controlled. Further, by rotating the plunger 5, the molten glass in the spout 1 is homogenized and its temperature is homogenized.

The plunger 5 makes a linear reciprocating (stroke) motion along the direction of the rotation axis, and controls the amount (diameter) of the molten glass extruded from the orifice 2 by the position and speed of this linear reciprocating motion. .. That is,
When the moving speed of the plunger 5 is increased, the diameter of the molten glass is increased, and when it is decreased, the diameter of the molten glass is decreased. Therefore, a large diameter portion and a small diameter portion of the molten glass are formed, and the small portion is cut by the shear 3. The amount of molten glass extruded from the orifice 2 is roughly determined by the moving speed of the plunger 5, and the amount of extruded glass is finely adjusted depending on the rotating direction and the rotating speed of the plunger 5.

When a double orifice is used as the orifice 2, the center position of the double orifice and the center position of the plunger 5 are aligned so that the same amount of molten glass is extruded from the two openings. Need to let.

The plunger holder 51 holds the plunger 5 rotatably and moves in the vertical direction as the rotary shaft 52 rotates. The vertical movement of the plunger holder 51 determines the stroke position of the plunger 5. Therefore, the stroke position of the plunger can be controlled by controlling the rotation direction and the rotation speed of the rotary shaft 52.

The plunger holder 51 is provided with a servo motor 6p for rotating the plunger 5.
The servomotor 6p and the plunger 5 are connected to the gear means 7
bound via p. The gear means 7p is for converting the rotational force of the servomotor 6p in the rotational axis direction into the rotational force of the plunger 5 in the rotational axis direction. Therefore, the plunger 5 rotates in synchronization with the rotation of the servo motor 6p.

The servomotor 6p is composed of, for example, a synchronous AC servomotor. A rotational position detection device 5p for absolutely detecting the current position of the servomotor 6p is coupled to the servomotor 6p. As the rotational position detecting device 5p, for example, an induction type phase shift type rotational position sensor as disclosed in JP-A-57-70406 or JP-A-58-106691 is used. The output of the rotational position detection device 5p is input to the rotational speed control means 4p, converted into digital position data, and used for controlling the rotational direction and rotational speed of the plunger 5.

The rotation speed control means 4p receives the position data Pdp from the rotation position detection device 5p and the PL rotation data (rotation speed command signal of the plunger 5) Rd from the plunger control means 8 and receives the rotation position detection device 5p. Rotation speed Pp and PL rotation data R obtained from the position data Pdp of
The deviation from d is obtained, a current command signal (torque signal) Tp corresponding to the deviation is generated, and the servomotor 6p is drive-controlled according to the current command signal Tp.

The rotary shaft 52 adjusts the vertical stroke of the plunger 5 (height from the bottom surface of the spout 1).
Move vertically at a ratio of mm. The gear means 7h applies the rotational force of the servomotor 6h in the rotational axis direction to the rotary shaft 5.
It is to be converted into a rotational force in the direction of the rotation axis 2. The servo motor 6h is composed of a synchronous AC servo motor like the servo motor 6p.

The rotational position detector 5h is a servo motor 6h.
Is connected to the servo motor 6h, that is, the rotating shaft 5
The rotation position of 2 is detected. The rotational position detecting device 5h has the same configuration as the rotational position detecting device 5p. The output of the rotational position detection device 5h is input to the plunger position / speed control means 4h, converted into digital position data, and used for controlling the vertical stroke position of the plunger 5. The rotation position detection device 5h may be directly provided on the rotation shaft 52.

The plunger position / velocity control means 4h receives the position data Pdh from the rotational position detection device 5h and the PL stroke position data (stroke position command signal of the plunger 5) Pd from the plunger control means 8,
A deviation between the moving speed Ph obtained from the position data Pdh of the rotational position detector 5h and the PL stroke position data Pd is obtained, and a current command signal (torque signal) T corresponding to the deviation is obtained.
h is generated, and the servo motor 6h is drive-controlled according to the current command signal Th.

A servo motor 6s for controlling the cutting operation is coupled to the shear 3 via a ball screw. The shear 3 moves in a linear direction (parallel direction) according to the rotation of the ball screw rotated by the servomotor 6s, and cuts the molten glass extruded from the orifice 2. Therefore, the shear 3 moves in a linear direction according to the rotation of the servomotor 6s, and executes the cutting operation of the molten glass extruded. The servo motor 6s is composed of a synchronous AC servo motor like the servo motor 6p. In addition,
The shear 3 may move in the arc direction.

The rotational position detector 5s is a servomotor 6s.
And detects the rotational position of the servomotor 6s, that is, the linear position of the shear. The rotational position detecting device 5s has the same configuration as the rotational position detecting device 5p. The output of the rotational position detecting device 5s is input to the shear position speed control means 4s, converted into digital position data, and used for controlling the cutting operation of the shear 3.

The shear position speed control means 4s inputs the position data Pds from the rotational position detection device 5s and the shear position data (position command signal of the shear 3) Sd from the plunger control means 8 and receives the rotational position detection device 5s. A deviation between the moving speed obtained from the position data Ps and the shear position data Sd is obtained, a current command signal (torque signal) Ts corresponding to the deviation is generated, and the servo motor 6s is driven by a current according to the current command signal Ts. Have control.

A fluid pressure cylinder may be used instead of the servomotors 6h and 6s. The fluid pressure cylinder controls the linear position of the cylinder rod by the fluid pressure.The fluid pressure cylinder consists of the cylinder rod, the cylinder, and fluid chambers provided on both sides of the cylinder rod. The fluid pressure in the fluid chamber is variably controlled by a servo valve. Thereby linearly moving the plunger holder 51 or the shear 3 mechanically coupled to the cylinder rod. Therefore, by driving the cylinder rod with fluid pressure, the plunger holder 51
Alternatively, the linear movement of the shear 3 can be controlled.

At this time, the fluid pressure cylinder may be a fluid pressure cylinder having a linear position detection device built-in, which has a linear position detection device for absolutely detecting the linear position of the cylinder rod in the fluid pressure cylinder. The detailed construction of the fluid pressure cylinder with the built-in linear position detecting device is described in Japanese Utility Model Publication No. 57-135917 and Japanese Utility Model Publication 58-58.
Since it is disclosed in Japanese Patent No. 136718 or Japanese Utility Model Laid-Open No. 59-175105, it will be omitted here.

The plunger control means 8 inputs the temperature signal Tg of the molten glass and the liquid level height signal Hg from the sensor in the spout 1, and the program counter 10 outputs P
The L start signals Pls1 to Pls4 and the shear start signal Sst are input, and a control signal for controlling the weight of the gob constantly based on these signals, that is, a PL for controlling the stroke position and rotation of the plunger 5.
The stroke position data Pd and the PL rotation data Rd are sent to the position speed control means 4h and the rotation speed control means 4p, and shear position data Sd for controlling the cutting operation of the shear 3.
To the position / speed control means 4s.

The plunger control means 8 has a microprocessor configuration including a CPU, a program ROM, a working RAM, a data RAM and the like (not shown),
In particular, the plunger control means 8 is a data RAM,
It has a plunger position data memory 81, a rotation data memory 82, and a shear position data memory 83.

In the plunger position data memory 81,
Four types of position data such as the PL stroke position data Pd in FIG. 3 are stored. The rotation data memory 82 stores rotation data such as the PL rotation data Rd in FIG. The shear position data memory 83 stores position data such as the shear position data Sd shown in FIG. The time t on the horizontal axis of FIG. 3 corresponds to the address of each memory, and predetermined data (Pd, Rd, Sd) is read from each memory each time the address changes with time. A common address area is assigned to the plunger position data memory 81 and the rotation data memory 82, and different data Pd and Rd can be read simultaneously by one address.

PL of the plunger position data memory 81
The stroke position data Pd is sent to the position / speed control means 4h,
The PL rotation data Rd of the rotation data memory 82 is fetched by the rotation speed control means 4p, and the shear position data Sd of the shear position data memory 83 is fetched by the position speed control means 4s, and used for their control.

The host controller 9 sets the operating environment of the plunger control means 8 and updates the data of the plunger position data memory 81, the rotation data memory 82, the shear position data memory 83 and the like.
As the host controller 9, a commercially available personal computer or the like is applied.

The program counter 10 counts the pulses from the oscillator and generates a synchronizing signal. The program counter 10 can set the generation timing of the synchronizing signal in a programmable manner, and accurately outputs the PL start signals Pls1, Pls2, Pls3, Pls4 and the shear start signal Sst as shown in FIG. 3 at each timing.

The plunger control means 8 outputs the PL output from the program counter 10 as shown in FIG.
Start signals Pls1, Pls2, Pls3, Pls4
The PL stroke position data Pd is read from the plunger position data memory 81 and the PL rotation data Rd is read from the rotation data memory 82 in synchronism with the rising time of the above, and output to the position speed control means 4h and the rotation speed control means 4p. Further, the plunger control means 8 reads the shear position data Sd from the shear position data memory 83 in synchronization with the rising time of the shear start signal Sst output from the program counter 10, and outputs it to the position / speed control means 4s. ..

FIG. 2 shows the plunger position / speed control means 4
It is a figure which shows the detailed structure of h, shear position speed control means 4s, and rotation speed control means 4p. The plunger position / velocity control unit 4h and the shear position / velocity control unit 4s have substantially the same configuration except that the objects to be controlled and the control signals are different. Further, the rotation speed control means 4p omits some of the constituent elements of the plunger position speed control means 4h or the shear position speed control means 4s.

The plunger position speed control means 4h includes a position control unit H1, a speed control unit H2, a current control unit H3,
It is composed of a position sensor conversion means H4 and a speed calculator H5. The position controller H1 includes a plunger position data memory 81, a speed controller H2, and a position sensor conversion means H4.
The PL stroke position data (position command signal) Pd indicating the target position of the servo motor 6h and the position data Ph indicating the current position of each servo motor 6h are input.

The position control unit H1 obtains a position deviation between the position command signal Pd and the position data Ph and outputs a speed command signal Fh corresponding to the position deviation to the speed control unit H2.
The position sensor converting means H4 is a linear position detecting device 5h.
A phase signal C1 for controlling the switching position of the magnetic field of the servo motor 6h is generated based on the position data Pdh from, and is output to the current controller H3.

The speed control unit H2 is connected to the position control unit H1, the current control unit H3, and the speed calculation unit H5, and the speed command signal Fh from the position control unit H1 and the speed signal F1 indicating the current speed of the servomotor 6h. Enter. Speed signal F1
Is the position data Ph of the position sensor conversion means H4 converted by the speed calculator H5. The speed calculation unit H5 inputs the position data Ph of the position sensor conversion means H4 and calculates the rotation speed F1 of the servo motor by digital calculation based on the amount of change in the position data Ph per predetermined unit time. The speed control unit H2 obtains a speed deviation between the speed command signal Fh and the speed signal F1, and a current command signal (torque signal) Th of the servo motor 6h according to the speed deviation.
To the current controller H3.

The current controller H3 is connected to the speed controller H2, the position sensor conversion means H4 and the servomotor 6h, and the current command signal (torque signal) Th and the phase signal C1.
Is input to generate a three-phase PWM signal to drive the power transistor and supply a drive current to each phase (U phase, V phase, W phase) of the servomotor 6h. At this time, the current detection isolator CT changes the current feedback signal T1 of the U-phase and V-phase current values to the current control unit H3.
Be fed back to. The current controller H3 supplies a drive current, which is obtained by amplifying a deviation between the current command signal (torque signal) Th of each phase and the current feedback signal T1 of each phase, to the servo motor 6h.

The current control unit H3 is used for the servo motor 6
It has a function to detect control states such as h overload, power supply voltage drop, overcurrent, overvoltage, and overheat, and a servo status signal indicating these control states and an ID code indicating the current amplifier rating. And a memory for storing various data such as a motor rating code indicating the rating of the servo motor to be controlled.

The data stored in the memory in the current control unit H3 is transmitted to the plunger control means 8 via a data line, a serial communication interface and the like (not shown) as necessary. The motor rating code is stored in the memory as a table. Therefore, each current control unit H3 performs control according to the transmitted data. For example, in the case of data relating to the drive of the servo motor, the drive current is supplied to the servo motor based on the data. Further, when the table number indicating the rating of the servo motor is transmitted, the drive current of the current control unit H3 is changed to the one corresponding to the rating of the servo motor according to the table number.

The shear position speed control means 4s is composed of a position control section S1, a speed control section S2, a current control section S3, a position sensor conversion means S4, and a speed calculation section S5. The position control unit S1 includes a shear position data memory 83,
The shear position data (position command signal) Sd indicating the target position of the servo motor 6s and the position data Ps indicating each current position of the servo motor 6s are input, which are connected to the speed control unit S2 and the position sensor conversion unit S4. To do.

The position control section S1 finds a position deviation between the position command signal Sd and the position data Ps, and outputs a speed command signal Fs corresponding to the position deviation to the speed control section S2.
The position sensor converting means S4 is a linear position detecting device 5s.
A phase signal C2 for controlling the switching position of the field of the servo motor 6s is generated based on the position data Pds from the above, and is output to the current controller S3.

The speed control section S2 is connected to the position control section S1, the current control section S3 and the speed calculation section S5, and a speed command signal Fs from the position control section S1 and a speed signal F2 indicating the current speed of the servomotor 6s are supplied. Enter. Speed signal F2
Is the position data Ps of the position sensor conversion means S4 converted by the speed calculator S5. The speed calculation unit S5 inputs the position data Ps of the position sensor conversion means S4 and calculates the rotation speed F2 of the servo motor by digital calculation based on the amount of change in the position data Ps per predetermined unit time. The speed control unit S2 obtains a speed deviation between the speed command signal Fs and the speed signal F2, and a current command signal (torque signal) Ts of the servo motor 6s according to the speed deviation.
Is output to the current control unit S3.

The current control section S3 is connected to the speed control section S2, the position sensor converting means S4 and the servomotor 6s, and the current command signal (torque signal) Ts and the phase signal C2 are provided.
Is input to generate a three-phase PWM signal to drive the power transistor, and a drive current is supplied to each phase (U phase, V phase, W phase) of the servomotor 6s. At this time, the current detection isolator CT outputs the current feedback signal T2 of the U-phase and V-phase current values to the current controller S3.
Be fed back to. The current control unit S3 supplies the drive current, which is obtained by amplifying the deviation between the current command signal (torque signal) Ts of each phase and the current feedback signal T2 of each phase, to the servo motor 6s.

The current control unit S3 has a function of the current control unit H3.
Similarly to, it has a function of detecting the control state of the servomotor 6s, and also has a memory for storing various data. Then, the data stored in the memory in the current control unit S3 is transmitted to the plunger control means 8 via the data line, the serial communication interface and the like (not shown).

The rotation speed control means 4p includes a speed control section P2,
It is composed of a current controller P3, a position sensor conversion means P4 and a speed calculator P5. That is, the rotation speed control means 4
The position control unit H1 or S1 of the plunger position / speed control means 4h or the shear position / speed control means 4s is omitted from p, and the PL rotation data (speed command signal) of the servo motor 6p directly from the rotation data memory 83. Rd is input to the speed control unit P2, and the servo motor 6p is drive-controlled based on the speed command signal Rd.

The speed control unit P2 has a rotation data memory 8
2. Connected to the current controller P3 and the speed calculator P5, the speed command signal Rd from the rotation data memory 82 and the speed signal F3 indicating the current speed of the servomotor 6p are input. The speed signal F3 is the position data Pp of the position sensor conversion means P4 converted by the speed calculator P5. The speed calculation unit P5 inputs the position data Pp of the position sensor conversion means P4 and calculates the rotation speed F3 of the servo motor by digital calculation based on the amount of change of the position data Pp per predetermined unit time. The speed control unit P2 obtains a speed deviation between the speed command signal Rd and the speed signal F3, and outputs a current command signal (torque signal) Tp of the servo motor 6p corresponding to the speed deviation to the current control unit P3.

The current control unit P3 is connected to the speed control unit P2, the position sensor conversion means P4 and the servomotor 6p, and the current command signal (torque signal) Tp and the phase signal C3.
Is input to generate a three-phase PWM signal to drive the power transistor, and a drive current is supplied to each phase (U phase, V phase, W phase) of the servomotor 6p. At this time, the current detection isolator CT causes the current feedback signal T3 of the current values of the U-phase and the V-phase to be changed.
Be fed back to. The current control unit P3 supplies a drive current, which is obtained by amplifying a deviation between the current command signal (torque signal) Tp of each phase and the current feedback signal T3 of each phase, to the servo motor 6p.

The current control unit P3 is the current control unit H3.
Similarly to the above, it has a function of detecting the control state of the servo motor 6p, and also has a memory for storing various data. Then, the data stored in the memory in the current control unit P3 is transmitted to the plunger control means 8 via the data line, the serial communication interface and the like (not shown).

FIG. 3 is a timing chart for explaining the operation of the gob generator of this embodiment. In the figure, PL start signals Pls1 to Pls4 and shear start signal Sst are timing signals output from the program counter 10 of FIG. 1 to the plunger control means 8. Hereinafter, the plunger control means 8 operates based on the timing signals Pls1 to Pls4, Sst.

First, when the gob generator as shown in FIGS. 1 and 2 is constructed, the data of the table number indicating the ratings of the servomotors 6h, 6s, 6p is transferred to the plunger position data memory 81, the rotation position data memory 82 and the shear position data. From the position data memory 83 to each plunger position control means 4h,
Rotation speed control means 4p and shear position speed control means 4s
To the current control units H3, S3 and P3. As a result, the current control units H3, S3, P3 are controlled by the servo motors 6h,
The 6s and 6p ratings are specified, and the servo amplifier functions according to the respective ratings.

The plunger control means 8 responds to the input of the PL start signal Pls1 from the rising time thereof to the plunger position data memory 81 and the rotation data memory 82.
The PL stroke position data Pd and the PL rotation data Rd are read from. The read PL stroke position data Pd and PL rotation data Rd are used as the position control unit H1 and the rotation speed control unit 4 of the plunger position speed control unit 4h.
It is input to the speed control unit P2 of p.

That is, the plunger control means 8 always outputs P as PL stroke position data Pd as shown in FIG.
d = 30 mm is output. At this time, the plunger 5 is located approximately 30 mm from the bottom surface of the spout 1. On the other hand, the plunger control means 8 outputs −5 rpm as the PL rotation data Rd. Then, the plunger control means 8 uses the program counter 1
By inputting the PL start signal Pls1 of 0, common addresses are sequentially given to the plunger position data memory 81 and the rotation data memory 82, and the PL stroke position data Pd and the PL rotation data Rd are read.

The PL stroke position data Pd and the PL rotation data Rd read from the plunger position data memory 81 and the rotation data memory 82 change as shown in FIG. That is, the PL stroke position data Pd
Is gradually increased from Pd = 30 mm to Pd = 40 mm, and the plunger 5 is pulled upward from the bottom surface of the spout 1. Then, the value is held for a certain time, Pd = 40 mm to Pd = 20 mm is reduced at any time, the plunger 5 is pushed down, and the molten glass is pushed out from the orifice 2 of the spout 1. When this pushing operation is completed, the PL stroke position data Pd is again Pd =
It returns to 30 mm and keeps the value until the next PL stroke position data Pd is input.

On the other hand, the PL rotation data Rd is Rd = + 5 rpm when the PL stroke position data Pd increases. Rd = -2.5 rpm is maintained during the period of Pd = 40 mm, and the PL stroke position data Pd is not rotating, that is, the PL rotation data Rd =.
It is 0 rpm. Then, the PL stroke position data P
When d returns to the initial value Pd = 30, Rd = + 5rp
m.

Thereafter, the plunger control means 8 receives the PL start signals Pls2 and Pl from the program counter 10.
Every time s3 and Pls4 are sequentially input, predetermined PL stroke position data Pd and PL rotation data Rd are output from the plunger position data memory 81 and the rotation data memory 82.
Is read out and the position control section H1 of the plunger position speed control means 4h and the speed control section P of the rotation speed control means 4p are read.
Output to 2 respectively.

Further, the plunger control means 8 starts reading the shear position data Sd from the shear position data memory 83 at the rising time thereof in response to the input of the shear start signal Sst. In the example of FIG. 3, the shear start signal Sst is output when the value of the PL stroke position data Pd decreases and the pushing operation of the plunger 5 ends. That is, the program counter 10 is set to output the shear start signal Sst when the molten glass is pushed out from the orifice 2 and the pushing operation is completed.

The read PL stroke position data P
The d and PL rotation data Rd are input to the position control section H1 of the plunger position / speed control means 4h and the speed control section P2 of the rotation speed control means 4p, respectively. Then, the position controller H1 outputs a speed command signal Fh based on the position command signal Pd and the position data Ph to the speed controller H2. The speed control unit H2 supplies a current command signal (torque signal) Th corresponding to the speed command signal Fh and the speed signal F1 to the current control unit H3.
Output to. At the same time, the speed control unit P2 outputs a current command signal (torque signal) Tp based on the PL rotation data (speed command signal) Rd and the speed signal F3 to the current control unit P3.

The current control units H3 and P3 have current command signals (torque signals) Th and Tp and current feedback signals T1 and T1, respectively.
Servo motor 6 based on T3 and phase signals C1, C3
The drive currents of h and 6p are controlled to control the stroke position and rotation speed of the plunger 5. Servo motor 6h,
Output P of the rotational position detectors 5h and 5p coupled to 6p
dh and Pdp are fed back to the position sensor conversion means H4 and P4.

That is, the position data Pdh is converted into position data Ph by the position sensor conversion means H4, and the position control unit H is used.
It is fed back to 1 and constitutes the position control loop as a whole. Further, the position data Pdh is fed back to the speed control unit H2 as the speed data F1 by the position sensor conversion means H4 and the speed calculation unit H5, and constitutes a speed control loop as a whole. Similarly, position data Pdp
Is fed back to the speed control section P2 as speed data F3 by the position sensor conversion means P4 and the speed calculation section P5, and constitutes a speed control loop as a whole.

When the shear start signal Sst is input from the program counter 10 to the plunger control means 8 during the above operation, the plunger control means 8 outputs shear position data Sd from the shear position data memory 83. It is read and output to the position control unit S1 of the shear position speed control means 4s. Then, the position control unit S1 uses the shear position data (position command signal) Sd and the position data P.
The speed command signal Fs based on s is output to the speed control unit S2. The speed control unit S2 outputs a speed command signal Fs and a current command signal (torque signal) Ts corresponding to the speed signal F2 to the current control unit S3.

The current control section S3 has a current command signal (torque signal) Ts, a current feedback signal T2 and a phase signal C.
Based on 2, the drive current of the servo motor 6s is controlled, and the shear cutting operation is executed. The output Pds of the rotational position detecting device 5s coupled to the servo motor 6s is fed back to the position sensor converting means S4. Therefore, the position data Pds is fed back to the position control unit S1 as the position data Ps by the position sensor conversion means S4, and constitutes a position control loop as a whole. Further, the position data Pds is the position sensor conversion means S4 and the speed calculation unit S5.
Is fed back to the speed control unit S2 as speed data F2, and constitutes a speed control loop as a whole.

The plunger control means 8 repeats the above operation to control the rotation of the servomotors 6h, 6s, 6p, and control the stroke position and rotation speed of the plunger 5 and the shear cutting operation.

If an abnormality such as overload, power supply voltage drop, overcurrent, overvoltage, or overheat occurs during this control, the data of the status signals indicating these control states are sent from the current control units H3, S3, P3. It is transmitted to the plunger control means 8. Plunger control means 8
Receives this status signal and performs processing according to the type of status signal. When changing the servo motors 6h, 6s, and 6p to servo motors with different ratings, the current controller does not need to send the table number indicating the changed servo motor rating to the current controller. It is possible to control the current accordingly.

The plunger control means 8 inputs the temperature Tg of the molten glass and the liquid level height Hg of the molten glass from the sensor in the spout 1, and each control signal (Pd, Rd, The value of Sd) is corrected and output to each plunger position speed control means 4h, rotation speed control means 4p and shear position speed control means 4s. That is,
The plunger control means 8 determines the height of the plunger 5 from the bottom surface of the spout 1, the moving speed and rotation speed of the plunger 5, and the cutting timing by the shear 3 to determine the temperature Tg of the molten glass in the spout 1 and the liquid surface height. Fine adjustment of the weight of the gob is performed by controlling it appropriately according to the height Hg.

For example, when the temperature of the molten glass in the spout 1 is low, its viscosity is large, so the plunger control means 8 causes the plunger 5 to move, rotate, and stroke (the height from the bottom of the spout 1). At least one of them is increased, and / or the cutting timing of the shear 3 is delayed. On the contrary, when the temperature of the molten glass in the spout 1 is high, its viscosity is small, and therefore the plunger control means 8 reduces the moving speed, the rotation speed and the stroke value of the plunger 5 by at least one, and / or the shear. Advance the cutting timing of 3.

Similarly, when the liquid surface height Hg of the molten glass is large, the pressure of the molten glass in the vicinity of the opening of the orifice 2 becomes high, so that the plunger control means 8 causes the moving speed, rotation speed and stroke value of the plunger 5. At least one of them is shortened, and / or the cutting timing of the shear 3 is advanced. On the contrary, when the liquid surface height Hg is small, the pressure of the molten glass becomes small, so that the plunger control means 8 causes the plunger 5 to move, rotate and rotate.
At least one of the stroke values (height from the bottom surface of the spout 1) is increased, and / or the cutting timing of the shear 3 is delayed.

FIG. 4 is a diagram showing an absolute type position sensor using an induction type phase shift system which is an example of the rotational position detecting devices 5h, 5s and 5p used in this embodiment. The details of this position sensor are described in JP-A-57-
Since it is known in Japanese Patent No. 70406 or Japanese Patent Laid-Open No. 58-106691, it will be briefly described here.

The rotational position detecting device includes a stator 71a in which a plurality of poles A to D are provided at predetermined intervals (90 degrees as an example) in the circumferential direction, and a space inside the stator 71a surrounded by the poles A to D. And a rotor 71b inserted in. The rotor 71b has a shape and a material that change the reluctance of each of the poles A to D according to the rotation angle, and is, for example, an eccentric cylindrical shape. Each pole A to D of the stator 71a
Includes primary coils 1A to 1D and secondary coils 2A to 2D
Are each wound. A first pair of two poles A and C and a second pair of poles B and D, which are opposed to each other in the radial direction, are coiled so as to operate differentially and are differential. It is configured to cause a reluctance change.

The primary coils 1A and 1C wound on the first pole pair A and C are excited by the sine signal sinωt and the primary coil 1 wound on the second pole pair B and D is wound.
B and 1C are excited by the cosine signal cosωt. As a result, their combined output signal Y is obtained from the secondary coils 2A to 2D. This combined output signal Y is a primary AC signal (excitation signal of the primary coil) sinω that serves as a reference signal.
The rotation angle θ of the rotor 71b with respect to t or cosωt
Signal Y = s phase-shifted by an electrical phase angle according to
in (ωt−θ).

Therefore, when the inductive phase shift type position sensor as described above is used, the primary AC signal sinω
It is necessary to include a reference signal generator that generates t or cosωt, and a phase difference detector that measures the electrical phase shift θ of the combined output signal Y and calculates rotor position data. The reference signal generator and the phase difference detector are provided in the position sensor conversion means H4, S4, P4.

FIG. 5 shows position sensor converting means H4, S4, P.
It is a figure which shows an example of No. 4. In FIG. 5, the position sensor conversion means is a phase difference (phase shift amount) between the reference AC signal sinωt and cosωt and the reference AC signal sinωt and the mutual induction voltage of the secondary coils 2A to 2D. And a phase difference detection unit for detecting Dθ.

The reference signal generator comprises a clock oscillator 72, a synchronous counter 73, ROMs 74a and 74b, D / A converters 75a and 75b and amplifiers 76a and 76b. A phase difference detector comprises an amplifier 77, a zero cross circuit 78 and a latch circuit. It consists of 79. The clock oscillator 72 generates a high-speed and accurate clock signal, and other circuits operate based on this clock signal. The synchronous counter 73 counts the clock signal of the clock oscillator 72 and outputs the count value as an address signal to the ROM 74a and the latch circuit 79 of the phase difference detector.

The ROMs 74a and 74b store amplitude data corresponding to the reference AC signal, and the synchronous counter 73
Amplitude data of the reference AC signal is generated according to the address signal (count value) from the. ROM74a is cosωt
, And the ROM 74b stores the sinωt amplitude data. Therefore, the ROMs 74a and 74b receive the same address signal from the synchronous counter 73 to generate two types of reference AC signals sinωt and cos.
Output ωt. Even if the ROM of the same amplitude data is read by the address signals having different phases, the same 2
A kind of reference AC signal can be obtained.

The D / A converters 75a and 75b are the ROM 7
The digital amplitude data from 4a and 74b is converted into an analog signal and output to the amplifiers 76a and 76b. The amplifiers 76a and 76b amplify the analog signal from the D / A converter, and use it to amplify the reference AC signals sinωt and cos.
ωt is applied to each of the primary coils 1A, 1C and 1B to 1D. Assuming that the frequency division number of the synchronous counter 73 is M, that M count is the maximum phase angle 2 of the reference AC signal.
This corresponds to π radian (360 degrees). That is, one count value of the synchronous counter 73 indicates a phase angle of 2π / M radian.

The amplifier 77 amplifies the combined value of the secondary voltage induced in the secondary coils 2A to 2D, and the zero cross circuit 7
Output to 8. The zero-cross circuit 78 is a mutual induction voltage (2) induced in the secondary coils 2A to 2D of the rotational position detecting device.
The zero-cross point from the negative voltage to the positive voltage is detected based on the following voltage), and the detection signal is output to the latch circuit 79.

The latch circuit 79 latches the count value of the synchronous counter started by the rising clock signal of the reference AC signal at the output point (zero cross point) of the detection signal of the zero cross circuit 78. Therefore, the value latched by the latch circuit 79 is exactly the phase difference (phase shift amount) Dθ between the reference AC signal and the mutual induction voltage (combined secondary output).

That is, the combined output signal Y = sin (ωt-θ) of the secondary coils 2A to 2D is given to the zero-cross detecting means 78. The zero-cross detector 78 outputs the pulse L in synchronization with the timing when the electric phase angle of the combined output signal Y is zero. The pulse L is used as a latch pulse for the latch circuit 79. Therefore, the latch circuit 79 latches the count value of the synchronous counter 73 in response to the rising edge of the pulse L. The period in which the count value of the synchronization counter 73 makes one cycle is synchronized with one cycle of the sine wave signal sinωt. Then, the reference alternating current signal sinω is input to the latch circuit 79.
The phase difference θ between t and the composite output signal Y = sin (ωt−θ)
The count value corresponding to will be latched. Therefore, the latched value is output as digital position data Dθ. The latch pulse L can also be used as a timing pulse as appropriate.

Of the values latched by the latch circuit 79, the values indicating the absolute position within one rotation of the servo motor are output as digital phase data C1, C2, C3, and are used for field switching position control. It Since the combined output signal of the phase shift type position sensor as shown in FIGS. 4 and 5 outputs the absolute rotational position as a phase difference signal, it has a characteristic that it is hardly affected by noise. Further, although FIGS. 4 and 5 are for detecting the range of one rotation absolutely, it is advisable to combine a plurality of such absolute sensors to detect the absolute position over multiple rotations.

FIG. 6 is a diagram showing a gob generator according to another embodiment of the present invention. In FIG. 6, the same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
The embodiment of FIG. 6 differs from that of FIG. 1 in that the plunger control means 8 does not input the shear start signal Sst from the program counter 10 of FIG. 1, but is generated by the start control means 84 provided inside. That is the point. That is, the start control means 84 provided inside the plunger control means 8 receives the position data P from the position sensor conversion means H4 of the plunger position / speed control means 4h.
h is input, this position data Ph is compared with the reference value Pr1, and the shear start signal Sst is based on the comparison result.
1 is output.

FIG. 7 is a timing chart for explaining the operation of the start control means 84. In the figure,
PL start signal Pls1 and shear start signal Sst
Is the same as the timing signal output from the program counter 10 in FIG. 1, and corresponds to that in FIG. The position data Ph1 and Ph2 are both curves showing the value of the position data Ph output from the position sensor conversion means H4 when the plunger 5 actually moves based on the PL stroke position data Pd of FIG.

For the position data Ph1, the plunger control means 8 sends a PL start signal P from the program counter 10.
The actual movement amount of the plunger 5 in the case where ls1 is taken in and the PL stroke position data Pd is output to the position / speed control means 4h without a dead time of the control cycle is shown. On the other hand, as for the position data Ph2, the PL stroke position data Pd is changed to the position speed control means 4 at the timing when the plunger control means 8 is delayed by the dead time of the control cycle.
The actual movement amount of the plunger 5 when output to h is shown.

The program counter 10 has a PL start signal Pls1 and a shear start signal S at predetermined time intervals.
Even though st is output, the plunger 5 is actually driven by the operation control cycle of the plunger control means 8.
Position data Ph1 and P1 until the time when the
There is a slight error as shown in h2.

Therefore, even if the shear start signal Sst is input to the plunger control means 8 within a fixed time after the output of the PL start signal Pls1, it is between the actual position data Ph1 and Ph2 of the plunger 5 at the input time. Causes a difference as shown in FIG. Due to this difference, shear cutting timing varies, and the weight of the gob fluctuates somewhat. However, this change in gob weight is
It is incomparably small compared to the weight fluctuation of the gob generating device composed of the sequencer and the NC device described in the section of the prior art.

The gob generator shown in FIG. 6 prevents the fluctuation of the weight of the gob, and outputs the shear start signal Sst by the start control means 84 provided in the plunger control means 8 as described above. It is the one.

The start control means 84 receives the position data Ph1 or Ph2 from the position sensor conversion means H4 of the plunger position / speed control means 4h and compares it with the reference value Pr1 as shown in FIG. The start control means 84, when the position data Ph1 or Ph2 and the reference value Pr1 match,
It has a flip-flop which is set to a high level "1" and then reset when the position data Ph1 or Ph2 and the reference value Pr1 match, and the shear start signal Sst1 or Ss is synchronized with the falling time of this flip-flop.
Output t2.

Therefore, even if there is a difference in the operation timing as shown in FIG. 7 between the position data Ph1 and Ph2, the start control means 84 continues the initial position after the pushing operation of the plunger 5 is completed. (Ph = 30m
When the position data Ph1 or Ph2 reaches the reference value Pr1 before returning to m), the shear position data Sd is read from the shear position data memo 83 and supplied to the shear position speed control means 4s, and the shearing operation by the shear 3 is performed. To start. As a result, variations in shear cutting timing do not occur, and fluctuations in gob weight can be prevented as much as possible.

The shear position data memory 83 is replaced by the plunger position data memory 81 and the rotation data memory 8.
You may make it read at the same address as 2. In this case, when writing data from the host controller 9 to the plunger position data memory 81 and shear position data memory 83, it is necessary to properly consider the operation timings of both.

In the embodiment, the case where the temperature of the molten glass and the height of the liquid surface in the spout 1 are detected and the weight of the gob is controlled on the basis of the detected temperature has been described. May be provided with a means for holding. In order to keep the temperature of the molten glass constant, heating / cooling control may be performed with a gas burner and an air blowing device provided around the spout. In the embodiment, the servo motor has been described as an example of the driving means, but it goes without saying that other driving means may be used. That is, the servomotor may be replaced with a hydraulic valve.

The servo motor is not limited to the synchronous type servo motor, but may be an induction type AC servo motor. In that case, it is not necessary to generate the phase signal. Further, it goes without saying that the type is not limited to the AC servo motor, and other types such as a DC servo motor may be used. Further, it goes without saying that the rotational position detection device is not limited to the inductive type phase shift type sensor, and an optical absolute encoder, an incremental encoder or another type of sensor may be used.

In the above-mentioned embodiment, the case where the plunger makes a fine adjustment of the flow of the molten glass, that is, the weight of the gob by the rotation thereof has been described. However, the present invention is not limited to this, and a cylindrical tube is provided around the plunger. However, it goes without saying that the weight of the gob may be finely adjusted by the height of the tube from the bottom surface of the spout and the rotation speed.

[0109]

According to the present invention, it is possible to stably supply gobs having different weights without changing the weight at each timing.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a schematic configuration of a gob generation device that is an embodiment of the present invention.

FIG. 2 is a diagram showing a detailed configuration of a control system of the gob generator shown in FIG.

FIG. 3 is a timing chart diagram for explaining the operation of the gob generation device in FIG.

FIG. 4 is a diagram showing a detailed configuration of the rotational position detection device of FIG.

5 is a diagram showing a detailed configuration of the position sensor conversion means in FIG.

FIG. 6 is a diagram showing a schematic configuration of a gob generator which is another embodiment of the present invention.

7 is a timing chart diagram for explaining the operation of the start control means in FIG.

[Explanation of symbols]

1 ... Spout, 2 ... Orifice, 3 ... Shear, 4s ... Shear position speed control means, 4h ... Plunger position speed control means, 4p ... Rotation speed control means, 5 ... Plunger,
5s, 5h, 5p ... Rotational position detecting device, 51 ... Plunger holder, 52 ... Rotating shaft, 6s, 6h, 6p ...
Servo motor, 7h, 7p ... Gear means, 8 ... Plunger control means, 81 ... Plunger position data memory, 8
2 ... Rotation data memory, 83 ... Shear position data memory, 84 ... Start control means, 9 ... Host controller,
10 ... Program counter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Tokunaga 3-21-7 Honda, Kokubunji City, Tokyo 1-103 Sun Heights (72) Inventor Seiji Hirohashi 1-16-7 Higashicho, Kodaira-shi, Tokyo Urbana Nheim 201

Claims (8)

[Claims] 1. A spout for storing molten glass, a plunger for linearly moving in the spout to push out the molten glass from the spout, and plunger position data in the linear movement direction of the plunger are input to it. A plunger drive means for driving and controlling the plunger based on the above; an orifice provided in the spout for controlling the diameter of the molten glass extruded from the spout by the linear movement of the plunger; and an orifice extruded from the orifice. A shear for cutting the molten glass, a shear driving means for driving and controlling the shear, a timing signal generating means for outputting an operation start signal of the plunger driving means and the shear driving means at a predetermined timing, and a plunger Over the entire range of the linear movement direction The barrel said plunger position data is stored in the memory,
A gob generating device comprising: a plunger control means for reading the plunger position data from the memory and outputting the plunger position data to the plunger driving means in response to the operation start signal from the timing signal generating means. .. 2. A spout for storing molten glass, a plunger for linearly moving inside the spout to push out the molten glass from the spout, and a current position of the plunger in the linear movement direction is detected to perform the linear movement. The plunger position data in the direction, and the plunger drive means for driving and controlling the plunger based on the current position and the plunger position data; and the spout, which is provided in the spout and moves linearly to move the plunger. An orifice for controlling the diameter of the molten glass extruded from the spout, a shear for cutting the molten glass extruded from the orifice, a shear driving means for driving and controlling the shear, and an operation start signal for the plunger driving means Timing signal output at a predetermined timing Generating means, storing the plunger position data over the entire range of the linear movement direction of the plunger in a memory,
Plunger control means for reading the plunger position data from the memory and outputting the plunger position data to the plunger drive means in response to the operation start signal from the timing signal generation means, and the current output from the plunger drive means. A gob generation device comprising: a shear start signal generating means for inputting a position and outputting an operation start signal of the shear driving means based on the current position. 3. A spout for storing molten glass, a plunger for linearly moving in the spout to push out the molten glass from the spout, and plunger position data in a linear movement direction of the plunger are input to it. A plunger drive means for driving and controlling the plunger based on the above; an orifice provided in the spout for controlling the diameter of the molten glass extruded from the spout by the linear movement of the plunger; and an orifice extruded from the orifice. A shear for cutting the molten glass, a shear drive means for inputting shear position data in the linear movement direction of the shear, and a shear drive means for driving and controlling the shear based on the shear start data, and an operation start signal for the plunger drive means at a predetermined timing. Timing signal generating means for outputting And storing the plunger position data and the shear position data over the entire range of the linear movement direction of the plunger in a memory, and from the memory in response to the operation start signal from the timing signal generating means. A gob generation device comprising: position data and shear position data, which are simultaneously read out and output to the plunger drive means and the shear drive means. 4. The plunger drive means inputs rotation data regarding a rotation speed and a rotation direction of the plunger, and rotationally controls the plunger based on the rotation data. The plunger control means causes the plunger control means to rotate. The rotation data together with the position data is stored in a memory, and the rotation data is read out together with the plunger position data from the memory in response to the operation start signal from the timing signal generating means to the plunger driving means. It outputs, It is characterized by the above-mentioned.
The gob generator according to 1. 5. The plunger drive means includes a servo motor for a plunger, a means for converting a rotational drive force of the servo motor for the plunger into a linear drive force, and a rotational position of the servo motor for the plunger is detected. And a rotational position detecting means for inputting the position signal and the plunger position data from the rotational position detecting means, and a plunger position control for outputting a plunger control signal of the plunger servomotor based on these signals. The gob generating device according to claim 1, 2 or 3, comprising: a means and a current control means that drives the plunger servomotor according to the plunger control signal. 6. The shear drive means includes a shear servo motor, a means for converting a rotational drive force of the shear servo motor into a drive force in an arc direction or a parallel direction, and a rotational position of the shear servo motor. A rotational position detecting means for detecting, and a plunger position control means for inputting the position signal and the shear position data from the rotational position detecting means and outputting a shear control signal of the shear servo motor based on these signals. The gob molding apparatus according to claim 2 or 3, comprising: current control means for driving the servo motor for shear according to the shear control signal. 7. The gob generator according to claim 1, further comprising means for maintaining the temperature and the liquid level of the molten glass in the spout constant. 8. The rotational position detecting means is an absolute type position sensor for detecting the position of the servo motor in absolute position, and the winding position is relatively displaced with respect to the winding part. A member for changing the magnetic resistance in the winding portion according to its relative position, and the winding portion is excited by a plurality of primary AC signals whose phases are deviated, and an electrical position corresponding to the absolute position of the servomotor is provided. The gob generation device according to claim 5, wherein the gob generation device is configured with a phase shift type position sensor that generates an output AC signal having a phase shift.