JPH0442980B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to improvements in tire forming equipment.

(Prior art) In order to improve the productivity and save labor of tire molding machines, a tire molding machine that automatically cuts and wraps tire parts such as inner liners and carcass plies is disclosed in Japanese Patent Application Laid-Open No. 146643/1983. , Japanese Patent Publication No. 59-70549
This has already been proposed in publications such as No.

(Problems to be Solved by the Invention) In the conventional tire forming apparatus described above, especially when forming a steel radial tire with a monoply carcass, the carcass ply is placed on the forming drum (or on the tire member already attached to the forming drum). )
When joining both ends after winding, it is necessary for the quality of the product tire that the joint be strong and that the cords in the carcass ply do not overlap or intersect. No matter how sophisticated the length measuring and cutting device is, (2) the outer diameter of the member already attached to the forming drum may differ in the width direction of the forming drum. () There is a tolerance in the thickness of the member already attached. () Elongation may occur during handling of the carcass ply. () Due to the quality of the product tire, it is necessary to cut while avoiding the cord, which may result in an error in the length of the cut. Due to such practical problems, only the joining has to be done by the molding operator, and there is a drawback that it is necessary to use seaming tape.

(Means for Solving the Problems) The present invention addresses the above problems, and includes a length measuring device for measuring the length of a tire member cut around one circumference of a tire, and a length measuring device for measuring the length of a tire member cut around one circumference of a tire. and a forming drum for adjusting the circumferential length to a length obtained by subtracting the lap allowance at the time of joining the tire members from the measured length,
The object is to provide an improved tire forming apparatus that provides accurate lap allowances for tire components.

(Example) Next, the tire forming apparatus of the present invention is shown in FIGS. 1 to 4.
This example will be explained by an example shown in the figure.
In the first stage of radial tire molding using the two-stage molding method, tire components such as the inner liner and carcass ply are first pasted together in a cylindrical shape to form a carcass band, which is then transferred to another molding drum using a transfer device. The case is shown in which tire members such as beads and sidewalls are attached to a first-stage radial tire molding machine to produce a green tire in the first step. As shown in Fig. 1, this tire forming machine includes a known band forming drum 1 having a plurality of segments constituting a practical cylindrical surface when expanded, and a main shaft 2b to which the forming drum 1 is attached. A headstock 2a that supports and rotates the molding drum 1 and also includes an expansion/contraction drive mechanism for the molding drum 1.
Also, a known band forming machine 2 equipped with a stitcher 2c (not shown), a known band servicer 3 for supplying tire members such as an inner liner to the forming drum 1, and a carcass forming drum 4 to be described later. A headstock 5 is slidably mounted on the base 5a, supports and rotates a shaft 5c to which the carcass forming drum 4 is attached, and has a drive device that rotates, expands and contracts the forming drum 4.
a carcass forming machine 5 equipped with a carcass forming machine 5b and a joining device 5d for joining carcass plies on the same forming drum 4, a first belt conveyor 6a, a second belt conveyor 6b, a known carcass cutter 6c, and a known carcass slet. A carcass servicer 6 equipped with a carcass servicer 6d and a carcass ply formed into a cylindrical shape on the carcass forming drum 4 (hereinafter referred to as a carcass ply band) is formed on the band forming drum 1 and on the band forming drum 1. A known band transfer device 7 is provided with a band gripping device 7a for conveying the carcass band onto a forming drum 8 in the first step described later, a band gripping device running rail 7b, and a drive device (not shown), and is expandable and retractable. A headstock 9a and a bead set turn which support and rotate the shaft 9b to which the molding drum 8 of the first step is mounted, and which rotate and expand/contract the drum 8. A tail stock 9 is slidably mounted on the bead set turn up devices 9c and 9f and the bead 9d and supports one of the bead set turn up devices 9f.
a known first-step molding machine 9 equipped with a stitcher 9g and a stitcher 9g;
Process servicer 10 and control device (see Figure 4)
It is composed of.

Next, according to FIGS. 2 and 3, the carcass forming drum 4 carcass forming machine 5 and carcass servicer 6 are shown.
will be explained in detail. The carcass forming drum 4 is
A threaded rod 2 (not shown) inside the shaft 11 has a thread symmetrical with respect to the center plane Z-Z of the drum 4, for example, a left-hand thread on the left side of the center plane Z-Z and a right-hand thread on the right side.
2 is rotatable via a bearing 23 (not shown),
In addition, a pair of nuts 24 (not shown) that are screwed onto each screw are slidably incorporated, and a pair of discs 12 having a plurality of holes 13 radially provided are fixed to the outer surface of the coaxial shaft 11. , a cam plate 19 having a plurality of sloped surfaces 18 on its outer periphery has a central plane Z-Z.
A cam plate 19 is fixed to the nut 24 by a key 20 which is slidably assembled symmetrically and slidably through a long hole 21 provided on the same shaft 11. When expanded, the guide rod 1 is fixed to a plurality of segments 17 whose outer peripheral surface constitutes a practical cylindrical surface and has magnets or vacuum cups embedded in appropriate locations.
6 is slidably inserted into the hole 13 formed in the disc 12, and the sloped surface provided inwardly of the segment 17 engages with the sloped surface 18 outwardly of the cam plate 19, and both ends of each segment 17 Since an endless tension coil spring 14 is stretched around a hook 15 fixed to the part, when the threaded rod 22 is rotated, the pair of cam plates 19 move symmetrically with respect to the Z-Z plane. As a result, the diameter of the outer peripheral surface of the segment 17 expands and contracts (hereinafter referred to as opening and closing). The head stock 5b of the carcass forming machine 5 is rotatably incorporated into the shaft 5c via a housing 32 which rotatably supports a shaft 5c bolted to the drum 4 via a bearing 31, and a bearing 46 (not shown). Furthermore, a center shaft 34 connected to the threaded rod 22 by a known means, and a pulse generator (hereinafter referred to as PG) for driving the rotation of the drum 4
A DC servo motor 43 with 44 and a DC servo motor 45 with PG 46 for driving the opening/closing of the drum 4 are assembled, and when the motor 45 is locked and the motor 43 is operated, the output shaft 41 is When the motor 45 is locked and the motor 45 is activated, the output shaft 39 is rotated, and the differential reducer 42 fixed to the housing 32 and the output shaft 4
Toothed pulley 3 for transmitting the output of 1 to the shaft 5c
3, 40, a toothed belt 37, and a toothed pulley 3 for transmitting the output of the output shaft 39 to the center shaft 34.
5, 38 and a toothed belt 36, and the movable head stock 5b is driven by a driving means (not shown) to move the center line Y-Y of the carcass forming drum 4 over the base 5a to the position shown in FIG. It is designed to be able to reciprocate between the center line XX of Note that power transmission is not limited to toothed belt drive, and other means such as gears may be used as long as there is no slippage. The joining device 5d also includes a bracket 51 fixed to the floor surface, and a movable stage 52 assembled to the bracket 51 so as to be slidable parallel to the rotation center of the carcass forming drum 4.
A cable air cylinder 57 (not shown) that reciprocates the movable base 52, a known position detector that detects the position of the movable base 52, and a guide rod 53 built into the movable base 52 to enable vertical movement. It is composed of a holder 54 fixed to the lower end, an air cylinder 56 for raising and lowering the holder 54, a position detector for the Honda 54, and a joining roller 55 rotatably assembled to the holder 54. The first belt conveyor 6a is swingably attached to a bracket 62 fixed to the frame 61 via a pin, and is attached near the center to a bracket 63 fixed to the frame 61 via a pin and an air cylinder 64. a conveyor frame 65, a drive roll 67, a tail roll 66, and a plurality of guide rolls 68, which are rotatably assembled to the conveyor frame 65; An endless conveyor belt 69 and a tachogenerator (hereinafter referred to as TG) 91 (not shown) fixed to the conveyor frame 65 and connected to the shaft of the drive roll 67.
No. 1 conveyor drive DC motor 90, a bracket 70 fixed to the conveyor frame 65, and a length measuring device 71 with PG fixed to the bracket 70.
and photoelectric devices 72 and 73. Further, the second belt conveyor 6b includes a conveyor frame 74 fixed to the frame 61.
A drive roll 75, a tail roll 76, and a guide roll 77 are rotatably assembled to the conveyor frame 74, and an endless roller is stretched around each of the rolls so that its center is within the Z-Z plane. It is composed of a conveyor belt 78 and a DC motor 92 with a TG 93 (not shown) fixed to the conveyor frame 74 and connected to the shaft of the drive roll 75. Note that although not shown in the figure, the belts 69, 78
is provided with tension adjustment means and meandering prevention means. Although not shown, there is a carcass ply c on the entrance side of the second belt conveyor 6b.
A known centering device is installed.
The carcass cutter 6c also includes a frame 79 fixed to the floor and a pair of guides 80 fixed to the frame 79 parallel to the Z-Z plane.
A movable base 81 is slidably assembled on the movable base 81, a DC motor 94 with a TG95 for driving a threaded rod (not shown) for reciprocating the movable base 81, a movable base position detector 96, and a movable base 81 that can be freely raised and lowered. A bracket 84 fixed to the lower end of a guide 82 incorporated in the bracket 84, an air cylinder 83 for driving the bracket 84 up and down, a position detector (not shown) of the bracket 84, and a spring 85 on the lower surface of the bracket 84.
A suction rod 85 with an electromagnet (or vacuum cup) fixed through a, a pair of knife stands 86 assembled to the same bracket 84 so as to be able to slide parallel to the Y-Y plane, and each of the knife stands A knife stand 87 fixed to each of the knife stands 86, a cable air cylinder (not shown) for reciprocating the knife stand 86 symmetrically with respect to the Z-Z plane, a position detector for the knife stand 86, and the Y- The receiving plate 88 is fixed to the frame 61 and has a knife 87 passage groove 89 provided parallel to the Y plane. Of course, for cutting ply where the cord within the ply is not perpendicular to the length of the ply, a means is added to adjust the running direction of the cutter 87 and the direction of the groove 89 to match the direction of the cord within the ply. Although it is necessary to do so, it is a known method and its explanation will be omitted.

Next, the configuration of the main parts of the control device will be explained with reference to FIG. 101 is a push button switch, a changeover switch,
An operating device having an indicator light etc., 102 is a sequence circuit that sends a signal to operate each movable part of the tire molding device in a predetermined order,
The sequence circuit 102 is composed of a relay, a timer, and the like. Further, 103 is a central processing unit CPU that performs data processing according to a program input in advance.
It consists of a memory circuit including RAM and ROM, an input/output interface, etc. Further, reference numeral 104 is a pulse signal sent from the length measuring device 71 to synchronize the running speed of the carcass ply and the surface speed of the carcass forming drum 4 when winding the carcass ply, and speed data output from the data processing device 103. Frequency divider that converts the signal into the required pulse signal based on the signal (pulse transmitter for speed setting when not winding the carcass ply, and switching between the output signal from the frequency divider and the pulse signal from the length measuring device 71) A relay is included, but it is not shown), 1
05 has a comparison circuit between the pulse signal sent from the PG 44 and the pulse signal output from the frequency divider 104, and a comparison circuit between the position data signal output from the data processing device 103, and is output from the sequence circuit section 102. A DC servo motor controller 106 controls the forming drum rotation motor 43 based on the signal output from the controller 105, and a DC servo motor controller 106 drives the motor 43 based on the output signal from the controller 105.
A DC servo motor driver 107 is a position data signal output from the data processing device 103 and a PG
46 is a DC servo motor controller that controls the forming drum opening/closing motor 45 based on the signal output from the sequence circuit section 102; 108 is a signal output from the controller 108; 109 is a DC servo motor driver that drives the motor 45 based on the above, and 109 is an AC motor controller that has a contactor and controls the joining roller traveling motor based on the output signal from the sequence circuit section 102.
110, 111, 112 are the first belt conveyor 6
a The sequence circuit section 10 has speed adjustment and acceleration/deceleration time adjustment functions for synchronizing the running speeds of the second belt conveyor 6b and the suction rod 85.
A DC motor controller 113 controls the No. 1 conveyor drive motor 90, the No. 2 conveyor drive motor 92, and the suction rod transfer drive motor 94 based on output signals from the solenoid valve and the pressure reducing valve. This is a pressure air control device that includes many devices such as a meter, a manual switching valve, a strainer, etc., and controls the pressurized air supplied to each of the air cylinders based on the output signal from the sequence circuit section 102. In this implementation, an AC motor, a DC motor, and a DC servo motor are used, but depending on the load size and other conditions, the DC motor may be replaced with a DC servo motor, or other types such as a pulse motor may be used. It is also possible to replace the motor with a motor, and in this case, the configuration of the control device will of course change, but this change can be easily made by those skilled in the art, and a detailed explanation will be omitted.

(Function) Next, the function of the tire forming apparatus will be explained. FIG. 2 shows a state in which the carcass ply band is started to be formed. That is, the tip _c1 of the carcass ply c sent out from the carcass let-off 6d is attached to the suction rod 8.
5 and is floating. In this state, the second belt conveyor 6b and the suction rod 85 are started simultaneously and synchronously (while ensuring that the carcass ply is not stretched or sagged), and the tip _c1 is connected to the first belt conveyor 6a.
When it reaches the top, stop it and then release the tip c ₁ from the suction rod 85. Next, the suction rod 85 is returned to its original position, and the first belt conveyor 6a and the second belt conveyor 6b are operated simultaneously and synchronously. At the same time as the tip c ₁ of the carcass ply c passes the photoelectric device 73, the data processing device 1
A pulse signal is sent to 03, and the data processing device 103 starts counting, and the count amount is
N ₁ is N ₁ = K ₁ (L ₁ - α) = K ₁ {L - (L ₂ + L ₃ + L ₄ ) + L ₆
-α} However, K ₁ : Number of pulses emitted by length measuring device 71 when carcass ply c moves unit length L : Required circumference of carcass ply band L ₂ : Center P ₂ of photoelectric device 73 and length measuring device Distance L ₃ between center P ₃ of photoelectric device 72 and center P ₃ of length measuring device 71 L ₄ ; Cutting _position of cutter 87 (position shown)
Distance L ₆ between P ₅ and the center P ₄ of the photoelectric device 72; Wrap distance of the carcass ply during joining a; When the travel distance of the carcass ply c during deceleration is reached, the conveyors 6a and 6b are decelerated and the count amount When _N2 reaches _N2 = _K1L1 = _K1 { _L- ( _L2 + _L3 + _L4 )+ _L6 }, the conveyors 6a and 6b are stopped,
Next, lower the bracket 84 and attach the suction rod 85.
Then, the bracket 84 is lowered, the cutter 87 is inserted into the carcass ply c, the suction rod 85 attracts the carcass ply c, and the cutter 87 is moved in the opening direction to close the carcass ply. Cut c.
When the cutting of the carcass ply c is completed, the bracket 84 is raised, the cutter 87 starts running in the closing direction (stops when it reaches the closing limit), and the first belt conveyor 6a starts running again. When the photoelectric device 72 detects that the cut end c ₂ of the carcass ply c has passed the P ₄ position, from the count number N ₃ of the output pulse signal from the length measuring device 71 at that time, N ₃ =K ₂ ( N ₃ /K ₁ +L ₂ +L ₃ -L ₆ -πD) However, K ₂ = Number of output pulse signals of PG46 when changing the circumference of carcass forming drum 4 D = Diameter of drum when carcass forming drum 4 is closed The data processing device 103 performs the calculation, outputs a position data signal to the DC servo motor controller 107, calculates speed data β using the following equation, and outputs the data signal to the frequency divider 104.

β=K ₃ /K ₁・1/(N ₃ /K ₁ +L ₂ +L ₃ −L ₆ ) However, K ₃ = Number of pulses sent by PG 44 every time carcass forming drum 4 rotates once. The data processing device 103 outputs a signal to open the drum 4, and the sequence circuit 102 outputs an open signal for the drum 4, which opens the drum ₄ until the output pulse signal of the PG 46 reaches N4. In this embodiment, the drum 4 is opened and closed using a sloped surface, but when using a known link-type drum, trigonometric functions are added to the equations of N ₃ and β. It will come in. Further, when the count number of the output pulse signal of the length measuring device 71 reaches the calculated value _N4 according to the following formula, the first belt conveyor 6a starts to decelerate.
When _N5 is reached, it stops, the air cylinder 64 is activated, and the carcass ply end _c1 is pressed against the drum 4.

N ₄ = K ₁ (L ₁ - α), N ₅ = K ₁ L ₁ where L ₁ ; Lower position P ₁ of carcass forming drum 4
Distance between P 2 and P ₂ When the pressing is completed, the first belt conveyor 6a
and carcass forming drum 4 start at the same time,
The carcass ply c is wound around the drum 4, and the drum 4 rotates so that the end c ₁ of the carcass ply c
When it comes under the joining roller 55, it stops. Next, the joining roll 55 descends and presses and runs the joining part to perform joining, but when the forming of the carcass ply band is completed, the center YY of the carcass forming drum 4 aligns with the center line XX of the other forming drum. When the band gripping device 7a moves so as to overlap the carcass forming drum 4 and grips the carcass ply band, the carcass forming drum 4 closes and the carcass ply band is held by the band gripping device 7a.
Cross over to a. Then, the band gripping device 7a returns to the waiting position (the position shown in FIG. 1), and the carcass forming drum 4 also returns to its original position, but during this time, the carcass ply servicer 6 Transfer cutting is carried out in the same manner as described above. On the other hand, in the band forming machine 2, the circumference of the band forming drum 1 is set to be slightly shorter than the circumferential length of the carcass ply band, and in this state, an inner liner and a tire structure are placed on the band forming drum 1 by a known method. After the chief seal, seam tape, etc. are pasted, and the pasting is completed, the band gripping device 7 that grips the carcass ply band
After a moves to the position of the band forming drum 1, the band forming drum 1 is expanded until the outer circumference of the attached member such as the inner liner becomes the same as the circumference of the carcass ply band, and then the band gripping device 7
When the carcass ply band a releases and returns to the waiting position, the stitcher 2c of the band forming machine 2 stitches the tire member on the band forming drum 1.
Finish forming the carcass band.

Next, the carcass band that has been formed is transferred onto the forming drum 8 of the first step by the band gripping device 7a, and subjected to bead setting, turn-up, and so on.
Sidewalls are attached, and the first step is to turn the tire into a green tire.

The above process involves transferring the carcass band, which has been formed into a cylindrical shape in advance, to the forming drum in the first step.
Although this is an example of a molding device based on the band molding method, the carcass molding device is also applicable to a molding device based on the so-called single-ply molding method, in which a tire member such as an inner liner is directly wrapped around the molding drum in the first step. Instead of feeding the carcass ply band formed on the forming drum to the band forming drum 1 in the same manner as described above, the carcass ply band formed on the forming drum is fed to the first band forming drum 1 by a band gripping device.
It goes without saying that this can be carried out by supplying it to the forming drum 8 of the process.

(Effects of the Invention) The tire forming apparatus of the present invention includes a length measuring device that measures the length of a tire member cut into one circumference of the tire as described above, and a length measuring device that measures the length of the tire member cut into one circumference of the tire. The molding drum is equipped with a forming drum that adjusts the circumference to the length obtained by subtracting the lap allowance when joining the members, and the above-mentioned action is performed, so that the following effects can be achieved. In other words, the length of the cut tire member is actually measured and the circumference of the forming drum is adjusted to match this length, so an accurate lap margin can be obtained and the tire members can be joined automatically. As a result, the burden on the molding operator is greatly reduced, and variations in tire quality caused by individual differences among molding operators are eliminated, making it possible to obtain tires of stable high quality. Furthermore, in the tire forming apparatus of the present invention, a detector for detecting the passage of both ends of a tire member is installed at a position spaced a certain distance from a length measuring device, and the length of the part of the tire member excluding both ends is measured. By doing so, you can achieve the following effects: That is,
The length of the length measuring conveyor (first and second belt conveyors in the example) can be increased by measuring the length other than both ends, where length measurement errors are likely to occur, and adding the previously measured sensing end assembly distance to this length. is possible,
Productivity can be improved. Furthermore, the tire forming apparatus of the present invention matches the set value of the circumferential length of the forming drum and the surface speed of the forming drum and the surface speed of the tire member supply device using the detection signal from the length measuring device and the calculation formula inputted in advance. The system is equipped with a data processing device that calculates frequency division ratios for each calculation and selects and sends out the calculated values, thereby achieving the following effects. In other words, it has a data processing device that selects, calculates, and outputs set values for measurement data ranging from length measurement to setting the circumference of the forming drum, and these tasks are automatically processed. This has the effect of reducing the burden on the worker and eliminating calculation errors and data setting errors that were caused by the worker.

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. .

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a tire forming apparatus according to the present invention, FIG. 2 is a side view taken along the line A-A in FIG. 1, and FIG. 3 is a side view taken in the direction B in FIG. FIG. 4 is a longitudinal sectional front view taken along line -B, and is a block diagram of the control device. 4... Forming drum, 71... Length measuring device, 7
2, 73...detector, 103...data processing device.

Claims (1)

[Scope of Claims] 1. A length measuring device for measuring the length of a tire member cut for one circumference of the tire, and a lap allowance at the time of joining the tire member being subtracted from the measured length obtained by the measuring device. A tire molding device characterized by being equipped with a molding drum that adjusts the circumference to a certain length. 2. A detector that detects the passage of both ends of a tire member is installed at a certain distance from a length measuring device to measure the length of the part of the tire member excluding both ends. A tire forming apparatus according to claim 1, characterized in that: 3 Using the detection signal from the length measuring device and the calculation formula entered in advance, calculate the circumference set value of the forming drum and the frequency division ratio to match the surface speed of the forming drum and the surface speed of the tire component supply device. 3. The tire forming apparatus according to claim 1, further comprising a data processing device that performs the following calculations and selects and sends out the calculated values.