JPH0734905Y2 - Share drive - Google Patents

Description

[Detailed description of the device] [Objective of device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shear drive device for cutting a gob in order to supply a molten glass gob (hereinafter referred to as a gob) to a glass product forming machine.

[0002]

2. Description of the Related Art Conventionally, as a shear drive system for cutting a gob, a pneumatic drive system, a cam system interlocked with a feeder, or a circular gear and link mechanism system is generally used.

[0003]

However, the above-mentioned drive system has the following drawbacks. That is, (1) When cutting the gob, the contact time between the shear blade and the glass is long, so that the cut portion is locally cooled. Therefore, when it becomes a product, this cut remains as a share mark (scissors mark), which not only lowers the product value, but depending on the degree, it becomes a defect defect in the product that emphasizes appearance (2 ) When cutting the gob, the contact time between the shear blade and the glass is long, so the shear blade is heavily worn and the shear blade is frequently replaced. Therefore, in addition to increasing the cost, it causes a decrease in the operating rate due to a long downtime due to replacement work. (3) In the case of air pressure drive, the drive system depends on the solenoid valve and air pressure, so the operation of the shear is The variation is large and not only the occurrence of the share mark but also the weight and shape of the gob fluctuates, which causes defects (4) When driven by a cam linked with the feeder,
For example, it is impossible to control only the share independently.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a shear drive device which shortens the contact time between the shear blade and the glass.

[Constitution of device]

[0006]

In order to achieve the above object, the present invention provides a shear blade for contacting and cutting a molten glass gob in a shear driving device for cutting the molten glass gob supplied to a glass product molding machine. Part, a link mechanism part that holds the shear blade part at one end, and the shear blade part that is connected to the other end of the link mechanism part and is in contact with the molten glass gob through the link mechanism part when cutting. It is characterized by comprising an unequal speed drive unit that drives at high speed and drives at low speed when not in contact.

According to the present invention, the non-constant speed drive unit is connected to the drive non-circular gear that rotates at a constant speed and the non-constant speed gear that meshes with the drive non-circular gear to rotate at a non-constant speed. And a second driven non-circular gear.

In the present invention, the non-constant speed drive unit includes a drive circular gear, first and second driven circular gears meshing with the drive circular gear and connected to the link mechanism unit, and the drive circular gear. It is characterized by comprising a servomotor for rotationally driving a gear and a control unit for controlling the servomotor to rotate at a non-constant speed.

[0009]

Since the present invention is constructed as described above, it drives at a high speed when the unequal speed drive unit contacts and cuts the shear blade with the molten glass gob through the link mechanism unit, and at a low speed when it does not contact. As a result, the contact time between the shear blade and the glass can be shortened.

Further, according to the present invention, since the non-constant speed drive unit is composed of the driving non-circular gear and the driven non-circular gear as described above, the non-constant rotation of the driven non-circular gear can be obtained with a simple structure.

Further, according to the present invention, since the control unit controls the non-constant speed rotation of the servo motor for rotationally driving the drive circular gear as described above, the non-constant speed control is performed. It becomes easy and can be applied to various glass product molding machines.

[0012]

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

FIG. 1 is a schematic view of a shear drive device according to an embodiment of the present invention. As shown in FIG. 1, a drive non-circular gear 2 fixed to a drive shaft 1 has a drive shaft 1. It is rotated at a constant speed by a drive motor (not shown). On both sides of this drive non-circular gear 1, driven non-circular gears 3a, 3b
(Hereinafter, generically called non-circular gear 3 for driven) is provided,
Rotation centers 4a and 4b (hereinafter collectively referred to as rotation center 4) are provided at eccentric positions and mesh with the drive non-circular gear 1.
Pins 5a and 5b (hereinafter collectively referred to as pin 5) are incorporated at a position at a constant distance from the rotation center 4b of the driven non-circular gear 3, and the pin 5 has link mechanism portions 6a and 6b (hereinafter, link mechanism). (Collectively referred to as section 6) is attached at one end. That is, one end is attached to the pin 5, the share arms 7a, 7b.
The link mechanism portion 6 (hereinafter collectively referred to as the share arm 7) and the link mechanisms 8a and 8b (hereinafter collectively referred to as the link mechanism 8) having one end connected to the other end of the share arm 7
Is configured. The other end of the link mechanism section 6, that is, the link mechanism
At the other end of 8, shear blades 9a and 9b (hereinafter collectively referred to as shear blade 9) that come into contact with and cut a gob (not shown)
The rotary motion of the driven non-circular gear 3 is transmitted through the link blade 6 to reciprocate in the X and Y directions, respectively.

By the way, the drive non-circular gear 2 fixed to the drive shaft 1 rotates at a constant speed when the drive shaft 1 rotates at a constant speed, but meshes with the drive non-circular gear 2. The driven non-circular gear 3 rotates at a non-uniform speed. This non-uniform speed rotation will be described with reference to FIGS. 2 and 3 based on a general example of two meshing non-circular gears 10a and 10b. Here, it is assumed that the non-circular gears 10a and 10b have the same size, that is, the number of teeth and the circumferential length are also equal.

When the non-circular gear 10a rotates at a constant speed about Oa from the state shown in FIG. 2 (a), the non-circular gear 10b rotates in the opposite direction about Ob.

The contact points of the non-circular gears 10a and 10b in FIG. 2 (a) are designated as Aa and Ab, respectively, and the non-circular gears are made from these points as starting points.
When 10a rotates 90 ° around the rotation center Oa, the peripheral surface of the non-circular gear 10a moves by l. Two meshed gears rotate by the same circumference, so the non-circular gear 10
The peripheral surface of b also moves by l and becomes the state shown in FIG. 2 (b).
The contact points of the non-circular gears 10a, 10b at this time are Ba, Bb,
Similarly, when the contact points of the two non-circular gears 10a and 10b are shown as Ca, Cb, Da and Db, respectively, every time the non-circular gear 10a rotates 90 °, it becomes as shown in FIG.

In FIG. 3, the circumferential lengths between the contact points of the non-circular gears 10a and 10b are AaBa = AbBb, BaCa = BbCb, CaDa = CbDb,
DaAa = DbAb. Also, the center of rotation of the non-circular gears 10a, 10b
Angle AaOaBa, angle Ba formed by Oa, Ob and the above contact points
OaCa, corner CaOaDa, corner DaOaAa, corner AbObBb, corner BbObCb, corner Cb
ObDb and angle DbObAb indicate the rotation angle per unit time of the rotation axes of the non-circular gears 10a and 10b, respectively. Therefore, it can be seen from FIG. 3 that the angular velocity of the non-circular gear 10b is not constant, that is, the non-circular gear 10b rotates at a non-uniform speed. That is, the rotation between Bb-Ab-Db is fast, and the rotation between Db-Cb-Bb is slow.

As described above, the driven non-circular gear 3 rotates at a non-constant speed around the center of rotation 4, and this non-constant speed is transmitted to the shear blade 9 via the link mechanism portion 6, and the shear blade 9 is rotated. Also performs reciprocating motions with unequal speed. And
The ratio of the number of teeth of the drive non-circular gear 2 to the driven non-circular gear 3 is appropriately set so that the shear blade 9 operates quickly when the shear blade 9 reaches a position where the shear blade 9 comes into contact with the gob. For example, the tooth ratio of the drive non-circular gear 2 and the driven non-circular gear 3 in FIG. 1 is set to 2: 1. When the drive shaft 1 makes one rotation, the shear blade 9 makes two shear cuts ( Cutting the gob).

Next, the operation of the shear drive device of one embodiment of the present invention having the above structure will be described with reference to FIG.

In FIG. 4, 11 is a displacement-time curve of the shear blade 9 of the present invention shown in FIG. 1, and 12 is a driving non-circular gear 2 and a driven non-circular gear 3 which are conventional circular gears. A displacement-time curve when the shear blade 9 and the gob are in contact with each other is generated between the displacement L1 and the displacement L2, and the shear blade 9 looks like scissors during this glass contact period. The so-called share blade overlap that intersects
It occurs between displacement L2 and displacement L3.

Therefore, comparing the glass contact period T1 of the shear drive device of the present invention with the glass contact period T2 of the conventional shear drive device, as is apparent from FIG. 4, the shear drive device of the present invention uses the shear blade 9 as shown in FIG. By driving at a non-uniform speed, the shear blade 9 operates relatively slowly before entering the contact period and after the contact period, and operates rapidly during the contact period, so that T1 <T2, which is less than the conventional contact period. The contact period of the present invention is greatly shortened.

Next, another embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is a schematic view of a shear drive device according to another embodiment of the present invention, and FIG. 6 is a side view of the shear drive unit and a control system. The same parts as those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the above figure, the drive circular gear 21 fixed to the drive shaft 20 is a servomotor centered on the drive shaft 20.
It is driven to rotate by 22. On both sides of the driving circular gear 21, driven circular gears 23a and 23b (hereinafter, the driven circular gear 23
Is collectively referred to as) and meshes with the driving circular gear 21. The link mechanism section 6 is attached to the driven circular gear 23 by the pin 5 installed at a position at a constant distance from the rotation center of the driven circular gear 23. As a result, the rotational movement of the driven circular gear 23 is transmitted to the shear blade 9 via the link mechanism section 6, and the shear blade 9 reciprocates in the X and Y directions, respectively. Therefore, the drive circular gear 21 and the driven circular gear 23 constitute a shear drive unit for driving the shear blade 9.

The tooth ratio of the driving circular gear 21 and the driven circular gear 23 is set to 2: 1 and the driving shaft 20 makes one revolution.
In other words, when the driving circular gear 21 makes one revolution, the shear blade 9 reciprocates twice and shear cuts twice. On the other hand, below the drive circular gear 21, there is a drive circular gear.
The slit disk 24 that rotates in synchronization with 21 is the servo motor 22
Is attached to the drive shaft 20 of. As shown in FIG. 7, the slit disk 24 is provided with slits 25a and 25b whose phases are shifted by 180 °. The phase difference between the slits 25a and 25b corresponds to the tooth number ratio of the driving circular gear 21 and the driven circular gear 23, and the signal from the slits 25a and 25b is the gob cut by the shear blade 9 and the reference of the glass product molding machine. Become a signal.

Further, the slits 25a and 25b are slit discs 24
It is detected by, for example, an optical sensor 26 disposed near the peripheral end of the, and this detection signal is output to the control unit 27. Further, the number of pulses corresponding to the rotation of the servo motor 22 is input to the control unit 27 from the encoder 28 attached to the servo motor 22. For example, the encoder 28 generates N pulses for each rotation of the servo motor 22.

Conditions for the gob cut by the share blade 9 are input and set in advance from a control console or the like (not shown) to the control unit 27 and stored in a storage unit (not shown) in the control unit 27. The preset conditions are, for example, depending on the link mechanism unit 6 and the share blade 9 used.
To adjust the time axis of the slit detection signal output from the sensor 26 or to optimize the intermittent time (index) of the shear blade 9 or the glass product molding machine, the shear blade 9 and the gob are in contact with each other. Servomotor
Rotation speed of 22 (rotation speed), rotation speed of servo motor 22 when shear blade 9 and gob are not in contact, share blade 9 and gob contact after slit detection signal is input from sensor 26 Encoder until 28
The number of pulses input from the encoder 28 and the number of pulses from the encoder 28 from the contact between the shear blade 9 and the gob to the gob cut. The control unit 27 uses the shear blade based on the gob cut condition, the slit detection signal input from the sensor 26, and the number of pulses input from the encoder 28.
The position of 9 is determined, and a control signal for controlling the rotation speed of the servo motor 22, that is, the rotation speed of the driving circular gear 21 is output to the servo motor drive unit 29. The servo motor drive unit 29 drives the servo motor 22 according to this control signal.

Next, the operation of the shear drive device of another embodiment of the present invention having the above-mentioned structure will be described with reference to FIG.

In FIG. 8, the interval between the continuous slit detection signals of the sensor 26 corresponds to one cycle of the gob cut operation,
The number of pulses of the encoder 28 required for this one cycle is N ₀ , but the control unit 27 controls the rotation speed of the servo motor 22 using the input slit detection signal of the sensor 26 as a reference signal.
First, after the slit detection signal of the sensor 26 is input, the servo motor 22 is rotated at the rotation speed n ₀ until the number of pulses from the encoder 28 reaches N ₁ , and then the encoder 28
When the number of pulses from reaches N _1, by rotating the servo motor 22 at a greater rotational speed n _1, further, if the number of pulses from the encoder 28 reaches N _2, the rotational speed n ₀ of the servo motor 22 original To rotate. On the other hand, the shear blade 9 operates in synchronism with the rotation speed of the servo motor 22, first starts at an operation speed corresponding to the rotation speed n _0, and the operation speed increases from the time when the rotation speed changes to n _1. When the number of pulses from the encoder 28 reaches N ₃ , the shear blade 9 starts contacting the gob and performs the gob cut. The gob cut is performed during a period in which the number of pulses from the encoder 28 corresponds to N ₄ , that is, a period of time T. After T time, the gob cut is completed, the shear blade 9 starts to return to the original position, and when the number of pulses from the encoder 28 reaches N ₂ , the operation speed returns to the original position and returns to the original position to operate for one cycle. To finish.

As described above, the servo motor 22 is controlled by the control unit 27.
By being non-uniform rotary control through the servo motor drive unit 29, rotates at a rotational speed n ₀ slower when the share blade 9 and the gob is not in contact, fast rotational speed when Gobukatto of contact share blade 9 and gob n Rotate at ₁ . Therefore, the contact time between the shear blade 9 and the gob is shortened.

Further, since two slit detection signals are generated from the sensor 26 per one rotation of the servo motor 22,
When the servomotor 22 makes one revolution, the gob cut operation by the shear blade 9 is performed twice.

In the above embodiment, the drive non-circular gear is used.
Although the ratio of the number of teeth between 2 and the driven non-circular gear 3 or the ratio of the number of teeth between the driving circular gear 21 and the driven circular gear 23 is set to 2: 1, it is not limited to this and can be set arbitrarily. Of course.

In the above embodiment, the control unit and the servo motor driving unit 29 are independent, but the present invention is not limited to this, and the control unit can be provided with a servo motor driving function. The configuration may be summarized as follows.

Further, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0035]

As described in detail above, according to the shear drive device of the present invention, when the shear blade and the molten glass gob are brought into contact with each other at high speed, the shear blade comes into contact with the molten glass gob. Save time,
The share mark can be reduced, the wear of the share blade can be reduced, and the life of the share blade can be improved.

Further, since the driving non-circular gear and the driven non-circular gear share blade are configured to obtain the non-uniform speed operation, the shear blade can obtain the non-uniform speed operation and the maintenance is easy. Become.

Further, by adopting the constitution in which the shear blade is operated at the non-uniform speed operation by the servo motor, the accuracy of the non-uniform speed operation of the shear blade is improved, and a stable cut molten glass gob with less variation in weight and shape is obtained. Since it is easy to control the rotation of the servo motor,
It is possible to support various glass product molding machines.

[Brief description of drawings]

FIG. 1 is a schematic view of a shear drive device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an operating state of a non-circular gear.

FIG. 3 is an explanatory diagram showing a change in rotation speed of a non-circular gear.

FIG. 4 is a curve diagram showing a displacement-time relationship of a shear blade.

FIG. 5 is a schematic view of a shear drive device according to another embodiment of the present invention.

FIG. 6 is a diagram showing a side surface of a shear drive unit and a control system.

FIG. 7 is a front view of a slit disk.

FIG. 8 is a time chart showing the operation of a shear drive device according to another embodiment of the present invention.

[Explanation of symbols]

2… Drive non-circular gears (drive non-circular gears, non-constant speed drive part) 3a, 3b… Drive non-circular gears (driven non-circular gears, non-constant speed drive part) 6a, 6b… Link mechanism parts 9a, 9b … Share blades 21… Drive circular gears (drive circular gears, unequal speed drive parts) 22… Servo motors (unequal speed drive parts) 23a, 23b… Driven circular gears (driven circular gears, unequal speed drive parts) 27 ... Control unit (unequal speed drive unit)

Claims (3)

[Scope of utility model registration request] 1. A shear drive device for cutting a molten glass gob supplied to a glass product forming machine, and a shear blade part for contacting and cutting the molten glass gob, and a link mechanism part for holding the shear blade part at one end. , A non-constant speed drive unit that is connected to the other end of the link mechanism unit and that is driven at a high speed when the shear blade portion comes into contact with the molten glass gob and cuts it through the link mechanism unit, and at a low speed when it does not contact A share drive device comprising: 2. The non-constant speed drive unit includes a drive non-circular gear that rotates at a constant speed, and first and second driven units that mesh with the drive non-circular gear and rotate at a non-constant speed to connect with a link mechanism unit. The shear drive device according to claim 1, further comprising a non-circular gear. 3. The non-constant speed drive unit includes a drive circular gear, and a first gear that meshes with the drive circular gear and connects with the link mechanism unit.
2. The shear drive device according to claim 1, further comprising a second driven circular gear, a servo motor that rotationally drives the drive circular gear, and a control unit that controls the servo motor to rotate at a non-constant speed.