JPS6045582B2 - Ply folding device for tire molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fly folding device for a tire molding machine.

In the molding process of tires for construction machinery, if the fly folding around No. 1 heat is carried out using a mechanical folding device, separation may occur between the drum and the fly due to frictional resistance during crimping movement between the tool and the fly. Conventionally, fly folding has been unavoidably done manually.

At this time, an adhesive such as core cement is applied between the drum and the fly to prevent peeling, but this cannot counteract the frictional resistance mentioned above. Furthermore, if the fly folding is performed manually, (I) the labor burden on the operator is high; (■) Molding efficiency decreases. (■) There was a problem that the quality of tires varied. No. For heat folding after the second heat, the rigidity of the heat is improved, so it becomes possible to use a mechanical folding device. The present invention addresses the above-mentioned problems, and includes a plurality of fly-turning tool heads mounted on a drum shaft so as to be able to move in the axial direction and expand and contract in the radial direction, and The tire is equipped with a plurality of heat retaining segments attached to the tire so as to be able to move in the axial direction and expand and contract in the radial direction, and the heat retaining segments retain the heat pressed against the fly on the tire forming drum. A fly folding device for a tire molding machine is characterized in that each heat holding segment is provided with a movable piece that moves in the axial direction together with the tool head, and its purpose is to reduce the burden on the operator. .

Molding efficiency can be improved. Furthermore, the quality of tires can be made uniform. The present invention provides a fly folding device for a tire molding machine. As described above, the fly folding device for a tire molding machine of the present invention includes a plurality of fly folding tool heads mounted on the drum shaft so as to be able to move in the axial direction and expand and contract in the radial direction. A plurality of heat retaining segments are mounted on the drum shaft so as to be able to move in the axial direction and expand and contract in the radial direction, and the heat retaining segments are crimped to the fly on the tire forming drum. Each of the heat retaining segments is equipped with a movable piece that moves axially with the tool head while retaining the generated heat, so the fly can be wrapped around the outer periphery of the tire forming drum, and the fly that comes out from both ends of the drum can be moved. The sections are bent in the direction of the drum axis and crimped against the outer surface of the drum by the stitching rollers of the stitching device, then each bead retaining segment is moved in the direction of the fly-turning tool head (axially) and the The NO.1 bead held by the bead holding segment is pressed against the fly crimped onto the outer surface of the drum as described above, and then, while maintaining this pressed state, each fly folding tool head is moved in the direction of each bead holding segment (axial direction). , press the edge portion of the fly protruding from the No. 1 bead in the direction of the drum axis in the direction of each bead holding segment, and at the same time move the tool head for turning each fly radially outward (in the expanding direction). Then, press the edge of the fly against the No. 1 bead.

In addition, in this state, the movable piece comes into contact with a ply edge portion outside the ply edge portion that contacts each fly folding tool head. Then, each fly turning tool head moving in the axial direction cuts the edge portion of the fly into the NO. Bend it along the l bead, and each movable piece is NO.
．． l Moves in the axial direction together with each tool head while holding the bead. In addition, each fly turning tool head is N
O. After passing the bead, stop each fly folding tool head, then move each bead and holding segment in the direction (axial direction) away from each fly folding tool head, and move the movable piece to the edge of the fly. , and then move each fly-turning tool head radially outward (in the direction of enlargement) until the NO. The edge portion of the fly protruding from the l bead in the direction of each bead holding segment is now folded radially outward, and when the tool head for each fly folding reaches its maximum expanded position, Set the tool head to NO. l Move in the direction of the bead (axial direction) and set the edge part of the fly to NO. By crimping and tightening the bead 4, the work of folding the fly is completed. In this way, according to the present invention, the fry can be folded back automatically, so that the burden on the operator can be reduced.

Molding efficiency can be improved. Furthermore, it has the effect of making the quality of tires uniform, and is very useful when applied to tire molding machines. Next, the fly folding device of the tire molding machine of the present invention will be explained with reference to an embodiment shown in FIGS. , 4 is a fly-folding hydraulic cylinder fixed to the housing 1 by bolts 5, 4a is a piston rod of the cylinder 4, and 10 is mounted on the drum shaft 3 by bushes 8 and 9 so as to be movable in the axial direction. Fly folding sleeve, 6 is bearing 7
The bracket 6 and the piston rod 4a are connected to each other by a bracket attached to one end of the sleeve 10 via a bracket.

In addition, 1 is a fly folding flange fixed to the other end of the sleeve 10 with a screw 12, and 16 is a flange 1 of the same.
A fly folding tool head 15 is slidably inserted into a plurality of holes provided radially in the same tool head 16. Rubber packings housed in each of the holes at the back, 13
14 is a joint for attaching the pressure air supply pipe 13 to the flange portion 11, and 17 is a spring surrounding each tool head 16. , pressurized air is supplied to the compressed air supply pipe 13
When the rubber gasket 15 is supplied to each hole, the rubber packing 15 expands.
such that each tool head 16 expands radially outwardly.
Also, when pressurized air is exhausted from each hole, each tool head 1
6 is adapted to contract radially inward by a spring 17. Further, 18 is connected to the housing 1 by the bolt 19.
a hydraulic cylinder for the bead retaining segment fixed to the
8a is a piston rod of the cylinder 18, 21 is a flange portion for a bead holding segment mounted on the sleeve 10 by a bush 20 so as to be movable in the axial direction, and 22 is a radial portion facing each of the fly folding tool heads 16. A plurality of bead retaining segments are incorporated into the flange 21 so as to be movable in the direction. Note that the flange portion 21 also has a mechanism for expanding each holding segment 22 radially outward or contracting radially inward, but this mechanism is not shown. In addition, 22a in FIGS. 1, 2, and 3 are guide holes provided in each of the bead holding segments 22, and 22b
is a guide groove provided in each bead holding segment 22, 2.
3 is a guide shaft slidably inserted into the guide hole 22a, 24 is a movable piece fixed to the guide shaft 23 and slidably inserted into the guide groove 22b, and 25 is the movable piece 24. A compression spring 26 interposed between the movable piece 24 and the flange portion 22 is a first bolt for preventing the movable piece 24 from coming off.
In the diagram, 27 is the tire forming drum, 28 is the fly, and 29 is the N.
O. It is l bead. Next, the operation of the fly folding device of the tire molding machine will be explained. A fly 28 is wrapped around the outer periphery of the tire forming drum 27, and the portions of the fly 28 protruding from both ends of the drum 27 are bent in the direction of the drum shaft 3.
After being pressed onto the outer surface of the drum 27 by a stitch roller of a stitching device (not shown), the fluid pressure cylinder 18
is operated in the extension direction, and the piston rod 18a, flange portion 21, and each bead holding segment 22 are moved in the direction (axial direction) of the fly turning tool head 16, and the NO. The l bead 29 is pressed against the fly 28 which is crimped onto the outer surface of the drum 27 as described above, and then, while maintaining this state, the fluid pressure cylinder 4 is operated in the contraction direction, and the piston rod 4a, the bracket 6, the sleeve 10, and the flange are part 11 and each fly-folding tool head 16 in the direction (axial direction) of each bead holding segment 22, as shown in FIG. The ply edge portion 28a protruding from the bead 29 toward the drum shaft 3 is pressed in the direction of each bead holding segment 22, and at the same time, pressurized air is supplied from the compressed air supply pipe 13 to the back of each rubber packing 15. 15 to expand each fly folding tool head 16 radially outward, and the ply edge portion 28a is expanded to the NO. Press it against l bead 29. Further, in this state, the movable piece 24 comes into contact with the ply edge portion 28a on the outside of the ply edge portion 28a that contacts each fly folding tool head 16. Thereafter, each fly turning tool head 16 moving in the axial direction moves the ply edge portion 28a to the NO. It is bent along the l bead 29, and each movable piece 24 is bent along the NO. It moves in the axial direction together with each tool head 16 while holding the l bead 29.
Moreover, as shown in FIG. When you start passing l bead 29,
As each movable piece 24 moves backward against the spring 25,
However, in this state, the fluid supply to the hydraulic cylinder 4 is cut off, and the piston rod 4a, the bracket 6, the sleeve 10, the flange part 11, and each fly-turning tool head 16 are brought into contact with the surface 22c of the flange part 22. The pressurized air behind the rubber packing 15 is then slightly exhausted to cause each fly-turning tool head 16 to contract slightly inward in the radial direction.Then, the fluid pressure cylinder 18 is operated in the contraction direction, and the piston rod 18a, the flange portion 21, and each bead holding segment 22 in a direction (axial direction) away from each fly folding tool head 16,
Each movable piece is separated from the ply edge portion 28a, and then pressurized air is supplied from the compressed air supply pipe 13 to the back of each rubber packing 15 to inflate each rubber packing 15 and move each fly folding tool head 16 outward in the radial direction. Enlarge it to the NO. l bead 29 to each bead retaining segment 2
Next, bend the ply edge portion 28a extending in the direction 2 outward in the radial direction, and when each fly folding tool head 16 reaches its maximum expanded position as shown in FIG. 7, the hydraulic cylinder 4 is extended. direction, and moves the piston rod 4a, bracket 6, sleeve 10, flange portion 11, and each fly folding tool head 16 to the NO. 1 in the direction of the bead 29 (axial direction), and set the ply edge portion 28a to NO.
By crimping and tightening the l bead 29, the fly 2
Complete the return work in step 8. Note that operation commands for each of the above-mentioned devices are automatically issued by limit switches and electric control devices (not shown). Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. be.

[Brief explanation of drawings]

Fig. 1 is a vertical side view showing an embodiment of the fly folding device for a tire molding machine according to the present invention, Fig. 2 is an enlarged longitudinal side view of the movable piece, and Fig. 3 is a view taken from the arrow 2 in Fig. 2. 4 to 7 are longitudinal cross-sectional rear views taken along the line (2) and are explanatory diagrams of the operation of the fly folding device. DESCRIPTION OF SYMBOLS 1... Drum shaft, 16... Tool head for fly folding, 22... Bead holding segment, 24... Movable piece, 27... Tire. Forming drum, 28... fly, 29... bead.

Claims (1)

[Claims] 1. Axial movement and radial expansion on the drum axis. a plurality of ply folding tool heads mounted on the drum shaft so that they can be moved in the axial direction and expanded and contracted in the radial direction; , a tire forming machine characterized in that each bead holding segment is provided with a movable piece that moves in the axial direction together with the tool head while holding the bead crimped to the ply on the tire forming drum by the bead holding segment. Ply folding device.