JPH024094Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to an improvement of a feed roller drive device in a glass tube blowing device.

Technical background of the invention Conventionally, the feed roller of a continuous endless glass tube blowing apparatus consists of a flat roller that rotates in a clockwise direction and a pocket roller that rotates in a counterclockwise direction to feed the molten glass flowing down from a glass melting furnace. The molten glass is sandwiched between a pair of rapidly rotating feed rollers, and cooling water is passed through the rollers to appropriately cool the molten glass, and the whole is extruded into a ribbon shape while forming a circular thick part corresponding to a pocket on the rollers. The tube was placed on a plate having an opening that was moving downward so that the circular thick portion was aligned with the plate, and thereafter, a desired tube was blown by blow molding.
This blowing device is suitable for mass production, but
The molten glass that flows in a ribbon shape results in the removal of unnecessary glass of approximately the same area as the area required for blowing, which poses problems in terms of energy and resource conservation, and various improvements have been made to date. It had been done.

Problems with the Background Art Since the feed roller of conventional blowing equipment rotates at a constant speed, the width of the glass ribbon formed by molten glass supplied at a constant flow rate is approximately the same as shown in Figure 7. In particular, since the ribbon width of the circular thick part necessary for blow molding and other unnecessary parts is the same, it is not possible to increase the ratio of product weight to molten glass volume (this is called usage efficiency). There were flaws.

Purpose of the invention In view of the above-mentioned problems, the present invention maintains the conventional glass ribbon width in the circular thick part necessary for valve blowing of the feed roller, while narrowing the glass ribbon width in other unnecessary parts. The purpose is to increase the production rate relative to the amount of molten glass as a whole.

Summary of the invention The present invention is designed to rotate the pocket roller and flat roller or pocket roller driven through these gears at non-uniform speeds by installing non-circular gears or eccentric gears in the feed roller drive device of the blowing equipment. When it is in the position where a thick part is formed, it rotates at a slow constant speed as before, and when it is in other positions, it rotates faster to narrow the glass ribbon width and reduce the amount of molten glass in unnecessary areas. The aim is to improve the commercialization rate.

Examples of ideas The present invention will be explained in detail below based on the drawings.

Embodiment 1 In FIG. 1, a gear 1 and a non-circular gear 2 are fixed to a rotating shaft 3. The non-circular gear 4 meshing with the non-circular gear 2 is connected to the rotating shaft 6 together with the gear 5.
is fixed to. A gear 7 meshing with the gear 5 is fixed to a rotating shaft 10 coaxial with the gear 8 and the pocket roller 9. A gear 11 meshing with the gear 8 is fixed to a rotating shaft 13 coaxial with a flat roller 12. The rotating shafts 3 and 6 are supported by a machine frame 14. Also, the rotating shafts 10 and 13
is pivotally supported by the machine frame 15.

In the feed roller drive device configured as described above, when the rotational force from the drive source of the blowing device main body (not shown) is transmitted to the gear 1, the non-circular gear 2 rotates via the rotation shaft 3. , the non-circular gear 4 which is meshed in a cooperative relationship also rotates, and the gear 5 coaxially rotates via the rotating shaft 6 to which the non-circular gear 4 is fixed. Similarly, the gear 7, the gear 8, and the pocket roller 9 rotate, and the gear 1 meshes with the gear 8.
1 and flat roller 12 rotate.

Here, the feed roller drive device of Embodiment 1 of the present invention is suitable for the case where the pocket roller has a plurality of pockets, and the tooth ratio of the gear 5 and the gear 7 is related to the number n of pockets of the pocket roller 9. It is necessary to set the ratio to 1:n.

Furthermore, although the rotating shaft 3 rotates at a constant speed, the rotating shafts 6, 10, and 13 rotate at non-uniform speeds due to the non-circular gears 2 and 4. Non-circular gears 2 and 4 at this time
The movements of the rotating shafts 3, 6, 10 and gears 5, 7 will be explained with reference to FIGS. 3 to 5.
FIG. 3 is a diagram showing the operation of the non-circular gears 2 and 4 in a simplified manner. Here, it is assumed that the non-circular gears 2 and 4 have the same size, that is, the number of teeth and the circumferential length are the same.

When the non-circular gear 2 rotates at a constant speed in the direction of the arrow from the state shown in FIG. 3a, the non-circular gear 4 rotates in the opposite direction to the non-circular gear 2.

The contact points of both non-circular gears 2 and 4 in FIG.
The circumferential surface of the non-circular gear 2 moves by l. Since the two meshed gears rotate by the same circumferential length, the circumferential surface of the non-circular gear 4 also moves by l during this time, as shown in Fig. 3b.
The state shown in is reached. Both non-circular gears 2 at this time,
Similarly, each time the non-circular gear 2 rotates 90 degrees, the two non-circular gears 2 and 4
If the contact points are shown as C, C', D, and D', respectively, the result will be as shown in Fig. 4.

In Fig. 4, the circumferences between the contact points of both non-circular gears 2 and 4 are AB=A'B', BC=B'C', and CD=
C′D′, DA=D′A′. Also, both non-circular gears 2,
If the centers of rotation axes 3 and 6 of 4 are O and O', respectively,
Angles AOB, BOC, COD, DOA, A′O′B′, B′O′C′, formed by each of the above contact points and centers O and O′,
C'O'D' and D'O'A' indicate the rotation angles of the rotating shafts 3 and 6 per unit time, respectively. Therefore, it can be seen from FIG. 4 that the angular velocity of the rotating shaft 6 is not constant, that is, it rotates at an inconstant speed.

In other words, it rotates quickly between A'-B'-C', and C'-
The rotation between D′ and A′ is slow.

Next, the operation of the gears 5 and 7 that rotate coaxially with the non-circular gear 4 will be explained.

FIG. 5 schematically shows the gears 5 and 7. Since the gear 5 is fixed to the rotating shaft 6, it rotates at an inconstant speed together with the rotating shaft 6. In FIG. 5, white areas indicate areas where the rotational speed is high, and shaded areas indicate areas where the rotational speed is slow. Therefore,
The gear 7 that meshes with the gear 5 rotates quickly when it meshes with a faster rotational speed part of the gear 5 and slowly when it meshes with a slower rotational speed part as the rotational speed of the gear 5 changes. . Therefore, the pocket roller 9, which rotates coaxially with the gear 7, also rotates at an inconstant speed. By providing the pocket portion 16 on the circumferential surface of the pocket roller 9 at a position corresponding to a portion where the angular velocity is slow, the pocket portion 16 of the pocket roller 9 is placed at a position where the molten glass flowing down from the melting furnace is sandwiched between the flat roller 12 and the pocket portion 16 of the pocket roller 9. When the glass ribbon reaches the desired position, the desired constant rotational speed is maintained, and when the glass ribbon is at another position outside of that area, the rotational speed becomes faster than the above-mentioned rotational speed, so that the glass ribbon width becomes narrower as shown in FIG. At this time, since the gears 8 and 11 are in mesh with each other, the flat roller 12 rotates in the opposite direction while exhibiting the same speed change as the pocket roller 9.

Embodiment 2 In FIG. 2, a gear 21, a non-circular gear 22, and a flat roller 23 are coaxially fixed to a rotating shaft 24, and the non-circular gear 2 meshes with the non-circular gear 22.
5 is coaxially fixed to a rotating shaft 27 together with a pocket roller 26, and the rotating shafts 24 and 27 are pivotally supported by a machine frame 28.

In the feed roller drive device configured as described above, when the rotational force from the drive source of the blowing device main body (not shown) is transmitted to the gear 21, the rotation shaft 24
The flat roller 23 rotates via the flat roller 23, and at the same time, the non-circular gear 25 and the pocket roller 26 which mesh with the non-circular gear 22 rotate.

Here, the flat roller 23 rotates at a constant speed,
The pocket roller 26 is rotated at an inconstant speed by the non-circular gears 22 and 25 performing the same operation as the non-circular gears 2 and 4 in the first embodiment. A pocket portion 29 is provided on the circumferential surface of the pocket roller 26 that faces the flat roller 23 when the rotational speed of the non-circular gear 25, that is, the rotating system including the rotating shaft 27 and the pocket roller 26, becomes slow. During one rotation of the pocket part 26, when the pocket part 29 is at a position sandwiching the molten glass flowing down from the melting furnace, it rotates at a constant speed as before, and when it is at another position, the rotation speed is faster than that. As described above, the second embodiment of the present invention is suitable when the pocket roller has one pocket.

Example 3 A similar effect of inconstant rotation can be obtained by changing the non-circular gears 2 and 4 and 22 and 25 explained in the above-mentioned Examples 1 and 2 to circular eccentric gears. The glass ribbon width in unnecessary parts can be made narrower.

Effects of the invention According to the invention, since the driving device can be operated continuously at non-uniform speed without stopping, it is possible to reduce the glass ribbon width in the part unnecessary for valve blowing. The production rate (usage efficiency) relative to the total amount of molten glass is significantly improved. Concomitantly, this has beneficial effects such as the ability to reduce manufacturing costs.

[Brief explanation of the drawing]

FIGS. 1 and 2 are plan views of essential parts of the feed roller drive device of the present invention, FIG. 3 is an explanatory diagram showing the operating state of the non-circular gear, and FIG. 4 is an explanatory diagram showing changes in the rotational speed of the non-circular gear. , FIG. 5 is an explanatory diagram showing changes in the rotational speed of gears 5 and 7 in FIG. 1, and FIG.
This figure is a plan view of a glass ribbon formed by the feed roller driving device of the present invention, and FIG. 7 is a plan view of a glass ribbon formed by a conventional feed roller driving device. 2, 4, 22, 25 are non-circular gears or eccentric gears, 12, 23 are flat rollers, and 9, 29 are pocket rollers.

Claims (1)

[Scope of utility model registration request] A feed roller that is used in a glass tube blowing device and is equipped with a flat roller and a pocket roller for press-forming molten glass flowing out of a glass melting furnace into a ribbon shape, and is mechanically connected to a drive source that rotates at a constant speed. In the drive device, a non-circular gear or an eccentric gear is interposed in a power transmission system that is composed of a plurality of gears and rotates the pocket roller and the flat roller, and rotates both the flat roller and the pocket roller or one of the pocket rollers at an inconstant speed. A feed roller drive device characterized by: