JPS61255840A - Apparatus for cutting rubber sheet - Google Patents

Abstract

PURPOSE:To make it possible to certainly cut a strip like rubber sheet without deforming the same, by mounting an exclusive cutter thrust into the almost center of the rubber sheet and cutters provided to both sides of said cutter so as to be spaced apart in the directions crossing the feed direction. CONSTITUTION:When the leading end of a ply 6 sent out from a letoff 7 is detected by a photoelectric switch 25, a ply length detector 6 starts measurement and, when the length of the ply reaches a predetermined value, a conveyor reduces the speed and stops. A cylinder 71 is operated to allow a clamp rod 70 to fall so as to press the ply 6 and a cylinder 81 is operated to raise the clamp rod 70 so as to hold the same between support plates 80 and, thereafter, a cylinder 40 is operated to fall a frame 39 so as to thrust cutters 54, 55, 58 into the center of the ply 6 in the lateral direction of the ply 6 in the lateral direction thereof and, when the ply 6 reaches cutting parts 54a, 55a, the frame 39 stops falling. When falling is stopped, a cable air cylinder 48 is operated to allow cutter stands 43, 44 to be spaced apart to each other and the cutting parts 54a, 55a cut the ply 6.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a cutting device for rubber sheets such as tire bim sheets in tire molding equipment.

Conventionally, in tire molding equipment, many proposals have been made for cutting devices for two-piece sheet (hereinafter referred to as ply) for tires and devices for supplying and winding ply to the forming drum. , has been put into practical use.

<Problems to be solved by the invention> However, in the conventional tire forming apparatus, the forming P
When automatically winding ram hebras, there are the following problems, especially for radial tire molding where precision is required.

(1) When cutting the ply, the cut portion is deformed and the cut end cannot be obtained at ii[lil.

(2) In the case of plies containing steel cords, the cutter knife may catch the steel cords, resulting in poor cutting.

(3) Ply with textile coat P has a weak elasticity, and when steel cord belts are made of breaker material, the coat P before rubberization is rolled up on a reel.

Even if it is cut straight, the cut part will deform into an acute angle while being handled on the drum.

Molding workers are forced to rework splices.

This invention #:l: has been made to solve the above-mentioned problems, and its purpose is to:

To surely cut a band-shaped Tsum sheet without deforming it.

<Means for Solving the Problems> The configuration of the present invention that achieves the above object is a device for cutting a band-shaped rubber sheet conveyed by a conveyor, and a device exclusively for piercing that can be inserted into the approximate center of the rubber sheet. and cutting cutters that are provided on both sides of the piercing cutter and are movable away from each other in a direction intersecting the conveyance direction of the rubber sheet.

Embodiment> A rubber sheet cutting device according to the present invention will be described in detail below based on an embodiment shown in the drawings. Figure 1 is a side view of essential parts showing one embodiment of the present invention, and Figure 2 is A-A in Figure 1.
Cross-sectional view.

Figure 3 is a sectional view taken along line B-B in Figure 2, Figure 4 is an enlarged view of section D in Figure 2, Figure 5 is a sectional view taken along line E-E in Figure 4, and Figure 6 is an enlarged view of section D in Figure 2.
It is a FF sectional view of the figure. In the figure, 1 is a forming drum of a tire forming device, 2 is a conveyor, and the conveyor 2 is
(2 conveyor belts)11. Tail roll 12, guide roll 13. From the drive roll 14° conveyor frame 15! D, bolted to common pace 5 and bolted to nine rails 16 and moving platform 18, Nen Gai P
17, and the conveyor frame 15 is attached to one end of the moving table 18 via a bin 191.
is swingably assembled and fixed to the other end of the moving table 18, and one end of a fluid pressure cylinder 21 is connected to the bracket 18& via a bottle 20, and the other end of the fluid pressure cylinder 21 is connected to the bracket 18&. The end is connected to the conveyor frame 15 through a 22ft line, and when the fluid pressure cylinder 21 is actuated, the drum side end of the conveyor 2 on the tail roll 12 side moves up and down, and the common pace 5 and the moving platform 18 move up and down.
The conveyor 2 slides in a direction perpendicular to the center of rotation of the forming drum 1 by the operation of a hydraulic cylinder 23 connected through a bottle between the brackets 18 and 18.

The conveyor belt 11 is driven by a variable speed motor such as a noggle motor (not shown). A roller 29 is attached to the common pace 5 via a frame 28. Further, a photoelectric switch 25 and a ply length detector 26 are attached to the bracket 24 fixed to the conveyor frame 15 to detect the path of both cut ends of the ply 6.

On the other hand, in the above structure, numeral 3 is a cutter device, which is provided at the center of the U-shaped frame 32 as shown in FIGS.
The U-shaped frame 32 is rotatably assembled and fixed to the lower surface of the deaf frame 32 via the U-shaped frame 32, and the nine-slide P33 slides on the upper surface of the common pace 5. - oscillates.

The lift frame 39 has a guide 38 fixed to the inner column 32c of the U-shaped frame 32 and engaged with the nine rails 37.

A rod of a hydraulic cylinder/40 is fixed to a bracket 32d provided on the inner support portion 32e, and when the hydraulic cylinder 40 is operated, the elevating frame 3
9 is designed to go up and down.

Furthermore, a pair of cutter stands 43.4 are provided on the guy P42 that engages with the rail 41 fixed to the side surface of the lifting frame 39.
4 is fixed to a pair of shafts 46 which are rotatably assembled to the elevating frame 39 via bearings 45.
is fixed, and the cable 49 of the cable air cylinder 48, which is fixed to the lifting frame 39, is looped around the slit 47 and fixed to the cutter table 43 and 44, causing a dangerous bracket) 50.
．． 51 is connected to the cable in a known manner and is operated by the cable air cylinder 48.

Each cutter table 43,44 may be spaced apart or moved closer to each other.

Cutters 54, 55 are fixed to each of the cutter stands 43, 44 via screws 52), cutters 54, 55, and cutters 54, 55, respectively.
Heaters 56 and 57 are attached to 55.

Further, the cutter 58 is fixed to the elevating frame 39 via a spring (not shown).

The shapes of the tips of the cutters 54, 55 and 58 are symmetrical as shown in FIG.
m is sharply finished as shown in FIG. 6, but the tip 58m of the cutter 58 is rounded as shown in FIG. The diameter is greater than the diameter of the stranded wire.

[Gai There is an electromagnet in the elevating frame 39 above.

A clamp rod 70 incorporating a known ply suction means such as a vacuum cup is attached so as to be movable up and down via a fluid pressure cylinder 71ft. Further, a support plate 80 is attached to the U-shaped frame 32 so as to be movable up and down through a guide mechanism (not shown) between the two conveyor pallets 11.
A piston rod of a fluid pressure cylinder 81 fixed to the ffi frame 32 is connected to the support plate 80,
By the operation of the hydraulic cylinder 81, the support plate 80 is raised and lowered to positions above and below the upper surface of the conveyor belt 11.

Next, the operation of the cutting and wrapping device for the next tire sheet, which is constructed as described above, will be explained.

First, the U-shaped frame 32 is swung so that the running line of the cutters 54, 55 matches the direction of the cord in the ply 6, that is, the cord angle. When the ply 6 sent out from the let offer is conveyed by the conveyor 2 and the photoelectric switch 25 detects the tip of the ply 6, the ply length detector 26 starts measuring the length, and the measured length value is set to a predetermined value. When reaching , the conveyor 2 decelerates and stops. When the conveyor 2 stops, the hydraulic cylinder 71 is activated, the clamp rod 70 is lowered, the ply 6 is pressed, the ply 6 is clamped, and the hydraulic cylinder 81 is activated, thereby interfering with the travel of the cutters 54 and 55. The ply 6 is held between the support plates 80 and the flange rod 70 is pushed back and raised until it reaches the position where the cylinder 4
0 operates, the elevating frame 39 descends and the cutters 54,
55 and 58 into the center of the ply 6 in the width direction at the upper part of the gap between the two conveyor belts 11, and when the ply 6 reaches the cutting portions 541L and 55& of the cutters 54 and 55, it stops descending.

Here, the cutters 54, 55 . and 58 is nonone 5
2 to the cutter table 43, 44 and the lifting frame 39
Since the tip 58a of the cutter 58 is rounded, even if the tip 58m comes into contact with the cord P in the ply 6 when inserting the cutter, the tip 58a of the cutter 58 will not touch the cord.
m escapes and the cutter 58 is inserted between the cords, and the cutter 5
4 and 55 are inserted between the same cords following the cut made by the cutter 58.

In this way, when the cutters 54.55.58 are inserted into the ply 6 and the lifting frame 39 stops lowering, the cable air cylinder 48 is activated, the cutter bases 43.44 are separated, and the cutters 54.55 are cut. The sections 54a and 551L cut the ply 6 along the cord.

As described above, when the cutting of the ply 6 is completed, the hydraulic cylinders 40.81 operate in reverse to raise the elevating frame 39, and at the same time, the support plate 80 lowers and the clamp rod 70.
Lift up the uncut portion of ply 6. At the same time, the cable near cylinder 48 is reversely operated to return the cutters 54, 55 to the position where they are in contact with the cutter 58.

Suddenly, the conveyor 2 restarts and stops when the tip of the cut ply 6 of the conveyor 2 reaches near the top of the tail roll 12.

If there is no interference with a device (not shown) such as a stitcher, the fluid pressure cylinder 23 is operated and the tip of the conveyor 2 is moved to the first dotted position under the forming r ram 1. Next, the fluid pressure cylinder 21 is actuated to swing the tip of the contactor 4a 2 upward.

The tip of the ply 6 is pressed against the forming drum 1, and then the conveyor belt 11 of the conveyor 2 and the forming P ram 1 are driven in synchronism so that their surface rotational speeds match, and the ply 6 is wound around the forming drum 1. Note that the conveyor belt 11
By providing a large number of small protrusions on the surface of the ply 6 or embedding a magnet, the ply 6 is prevented from shifting laterally with respect to the conveyor belt 11.

In addition, it is desirable that the cone belt 11 be easily separated when being wound up by the forming drum IVc.

Although not shown, the belt conveyor 2 is provided with means for preventing the conveyor belt 11 from meandering, and a centering device for the plies 6 is installed at the entrance of the conveyor belt 2.

In this way, when the winding of the cut ply 6 onto the forming drum 1 is completed, the conveyor 2 descends, the conveyor belt 110 stops running, and the fluid pressure cylinder 23 is reversely operated to return it to the cutter device 3 side. and stop.

Next, the fluid pressure cylinder 71f operates and the clamp rod 7
0, release the tip of ply 6, and turn the hydraulic cylinder/
71 is operated in reverse to raise the flange rod 70t. When continuing to mold the next tire after that, the conveyor 2 runs, returns to the initial state, and repeats the above-mentioned cleaning operation in sequence.

In the above embodiment, the center cutter is attached to the frame via a spring and the tip is rounded to ensure that the cutter is inserted between the cords, and the cutters on both sides are attached to the cutter stand via springs. This ensures that three cutters are inserted between the same cords.

Further, the cutter is inserted into the center of the ply in the width direction, and the ply is clamped by a clamp bar, and then the ply is cut at a distance from both sides, so that the cutting line is maintained in a straight line. Furthermore, since the outlet straight part of the cone 4a is brought into contact with the lower surface of the forming P ram and the ply is wound around the forming drum, the cut end of the ply is not deformed and accurate ply winding can be achieved.

<Effects of the Invention> According to the tom sheet cutting device according to the present invention, the tom sheet can be reliably cut without deforming the tom sheet, and the cutting line can also be kept straight.

[Brief explanation of drawings]

FIG. 1 is a side view of the main parts of a tire sheet cutting and winding device according to an embodiment of the present invention. Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view taken along line B-- in Figure 2.
4 is an enlarged view of section D in FIG. 2, FIG. 5 is a sectional view taken along line EE in figure 3g4, and FIG. 6 is a sectional view taken along line FF in FIG. 4. Inside the drawing. 1 is a forming drum, 2 is a conveyor, 3 is a cutter device, 5 is a common pace, 6 is a ply, 7 is a ply let-off, 11
15fl conveyor frame, 16 rail, 18fi moving table, 21.23, 40, 71.8
1 is a fluid pressure cylinder/, 25&! A photoelectric switch, 26 a ply length detector, 32 a U-shaped frame, 39 a lifting frame, 43.44 a cutter stand, 54.55 a cutter exclusively for cutting, and 58 a cutter exclusively for piercing. 54ae and 55a are ply cutting parts, and 80 is a support plate. Patent and patent applicant: Mitsubishi Heavy Industries, Ltd., sub-agent Patent attorney Shibu Mitsuishi (and 1 other person) Figure 3 L-1 Figure 5 Figure 6 Figure 4-E

Claims (1)

[Claims] A device for cutting a band-shaped rubber sheet conveyed by a conveyor, which includes a piercing-dedicated cutter that can be inserted into the approximate center of the rubber sheet, and a piercing-dedicated cutter that is provided on both sides of the piercing-dedicated cutter and that intersects with the conveyance direction of the rubber sheet. 1. A rubber sheet cutting device comprising cutting cutters that are movable away from each other in directions.