JPS5814732A - Controlling method of open and close positions of drum in tire molding machine - Google Patents

Abstract

PURPOSE:To improve productivity by a method wherein the open-and-close positions of a drum are detected, the relative positions are displayed digitally and interlocked with a digital switch. CONSTITUTION:The open-and-close positions of drums 4a and 4b are detected by a rotary sensor 30, signals of the open-and-close posotions are sent from an input circuit 35 to a display drive circuit 37 and the open-and-close positions are displayed digitally at the display part 36. The absolute positions with the drums 4a and 4b can always be displayed. These open-and-close position signals and reference position signals established by digital switches 38-1-38-7 are sent to coincidence circuits 39-1-39-7. When they coincide, relays 40-1-40-7 are driven to stabilize the open-and-close motions of the drums 4a and 4b. Additionally, since digital switches and a rotary sensor are used, information does not disappear even in time of source interruption.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method A'2 for controlling the opening/closing position of a drum in a tire building machine. A digital switch is used for reference setting to simplify the setting, and a rotation sensor is used to detect the open/closed position of the drum for higher accuracy.Also, the stored information will not be lost even in the event of a power outage. The purpose is to make it possible to maintain it.

In a tire molding machine, the bladder straddles a pair of drums.
There is also a device in which the pair of drums can be opened and closed in the axial direction by rotation of a rotating shaft, thereby expanding and contracting the bladder. When molding green tires with this type of tire molding machine, the drum opening/closing position 1
f With these settings, during the series of molding processes from charging the green tire to taking the molded tire outside,
When the drum reaches the set opening/closing position, it is necessary to detect this and control each part in sequence to the next process. By the way,
The drum opening/closing positions required during the molding process are as follows.

8 DLS-1 Safety limit position where the drum is opened to the maximum DLS-2 Position where the green tire is set DL8-3
Position to set the green tire and switch the drum opening speed DLS-4 Position to apply internal pressure inside the green tire and perform preliminary shaving DLS-5 Shaving position DLS-6 Position to switch the drum closing speed when taking out the tire after molding DLS-7 At the position where the drum is closed to its maximum extent, during molding, each of the above positions is detected and control as shown in FIG. 1 is performed, for example.

That is, when the drum (lB) (lb) is at the DLS-7 position, after setting the tire molding machine, the drum (Ia) (4b) is opened to the DLS-2 position. At this time, DLS
The drum (1a) moves at high speed from the -7 position to the DLS-3 position.
) (lb) and switch to low speed after the DLS-3 position. When the drums (Ia) and (Ib) are opened to the DLS-2 position, the vehicle is stopped and a green tire is set. Next, in JP-A-58-14732 (2), after closing the drum (LA) (TB) to the DLS-4 position and performing preliminary shaving for a predetermined time, the drum (LA) (TB) is
la) (lb) 'Ik Close again to DL8-5 position and move on to shaving. When the shaving is completed, the drum (la) (lb) closes at high speed and the DLS-6
After switching to low speed at the DLS-7 position and closing it to the DLS-7 position, the molded green tire is taken out. If preliminary shaving is not required, DLS-2 position
It is sufficient to close the drum directly to the LS-5 position.

In this way, tire molding machines operate differently depending on the open/close position of the drum.
For control purposes, it is necessary to detect the opening and closing positions of the drum in small pieces with high precision. However, in the past, a rotary cam switch was used and each position was set by adjusting the position of the cam in the circumferential direction, which resulted in complicated settings and poor setting accuracy. There was a problem with detection accuracy. In other words, since the setting is made by rotating the cam,
□ Originally, the accuracy was not that good, and there were individual differences between workers, making it difficult to adjust and requiring time. Therefore, if the tire size changes, the shape of the drum also changes, so the positions of DLS-1 to DL8-7 must be changed each time, but conventionally, when changing the tire size, , many rotary cam switches needed to be adjusted, resulting in very poor work efficiency.Furthermore, product variations were likely to occur due to individual differences in adjustment, making it difficult to achieve high quality tires. .

The present invention was provided with the aim of solving these conventional problems, and its feature is that the pair of drums supporting the Prada can be moved in a precise direction by the rotation of a rotating shaft. In a tire molding machine equipped to be freely opened and closed, the open/close position of the drum is detected by a memory-type rotation sensor linked to the rotating shaft, and the open/close position signal from the rotation sensor is sent to a display drum circuit via an input circuit. and digitally display the opening and closing positions of the drum on a display unit,
The position reference signal set in advance by the digital switch and the open/close position signal from the input circuit are sent to the matching circuit 6, and when the position reference signal and the open/close position signal match, the signal is sent via the relay drive circuit. The key point is to activate the relay.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment.
In the figure, (2) is a green tire, and (3) is a bladder, which are mounted around a pair of upper and lower drums (4aX4b). The drum (4aX4b) is integrally equipped with supporting bosses (5aX5b), and each of the bosses (
5a) and (6b) are fitted into the guide cylinder part (7) of the rotating outer shaft (6) so as to be slidable in the axial direction, and the guide cylinder part (
7) A female threaded body (sa) (sb) located inside is provided. The rotating outer shaft (6) is connected to the bearing No. 1 via the bearing (9).
It is rotatably supported around the axis by the housing α0. 0D is a rotating center shaft, which is rotatably inserted and supported by the outer rotating shaft (6), and each drum (4a
A threaded portion (sgaX12b) with a reverse thread structure is formed to be screwed into the female threaded body (sa) (sb) of It can be opened and closed between DLS-1 and DL8-7. A3 is a forward/reverse motor, α-transmission mechanism, and its driven pulley (to) is rotatably fitted into the lower end of the rotary fill (6). Clutch 0η081 allows power to be transmitted to the outer rotating shaft (6) and the rotating inner shaft aυ. 09 is a brake for braking the outer rotating shaft (6). The handle is a differential device, and includes a pair of side gears I22@ fitted on the differential shaft D so as to be relatively rotatable, and an arm ■ on the differential shaft QD that is always engaged with these gears @ (to). It has a rotatably fitted bevel gear (to), and each of its side gears (
A) (C) is a worm gear mechanism (Foundation), a chain transmission mechanism (C) is connected to the rotating outer shaft (6) and the rotating inner shaft O through the wire.
It is linked to D.

In Fig. 3, (to) is a pulse encoder that is an example of a memory-type rotation sensor, and includes a rotating disk C11) with a through hole fixed to a differential shaft, and this rotating disk a.
A plurality of light emitting diodes (c) and photodiodes 04 are arranged facing each other so as to sandwich η from both sides in the axial direction, and a slit plate (b) interposed between the rotating disk ci°C and the light emitting diodes (to). and a drum (4aX
4b) is configured to detect the open/closed position. (
(To) is the input circuit, (To) is the display unit that digitally displays the drum open/close position f: 3 digits, and (B) is the display drive circuit. It has a decoder function to convert the received open/close position signal from binary to decimal, and also has a function to drive each segment of the display section. (88-1) to (88a) are digital switches that set the reference position for opening and closing the drum, for example, DL
Seven pieces are provided corresponding to DL8-1 to DL8-7. Matching circuits (89-1) to (89a) are provided at the next stage of each of the digital switches (aS-t) to (88-7), respectively. The matching circuits (89-1) to (+19-7) receive the open/close position signal X from the input circuit (to) and the position reference signals 8al to a7 preset by the digital switches (88-1) to (88-7). It is determined whether the two match or not, and when they match, a match signal is generated to the next stage match-holding relay drive circuit. - The paper holding relay drive circuit (g) is configured such that the open/close position signal X is the position reference signal 14. ~a, when above, matching circuit (40-1) ~(
4G-7) and activates the corresponding relay (<!-O~(41-7).The relays (41-1)~(41-7) operate according to the command. This is to operate the motor o3 and other electric valves.Please note that the drum (4
It goes without saying that the opening/closing amount in a) and (4b) is designed to be within one rotation of the differential shaft QIl.

Next, the operation of the above configuration will be explained. Clutch αη(
When air, etc. is supplied to the clutch (171 (to)) and the clutch (171 (to) is connected, the power from the motor 03 is transferred to the clutch aηQ8
)e to the rotating outer shaft (6) and the rotating middle shaft 0υ, and these two shafts (6)0η rotate together. Therefore, the drums (4a) and (4b) can be rotated forward or reverse depending on the rotational direction of the motor (to) while maintaining the predetermined open/closed positions.

Drum (aa) (tb) 'eWhen opening and closing, disengage clutch aη and activate puller 1/-key aCJ'f: to fix the rotating outer shaft (6) so that it cannot rotate fully, while clutch ( ) and connect the motor a3 to rotate the center shaft αη.
to drive.

At this time, if the motor (13) rotates normally, the rotating center shaft (11
) to be screwed into the threaded parts (t2a) (12b)
The drums (4aX4b) operate in the separating direction to open the drums (4aX4b) via the motors (aaXab), and if the motor 0 is in reverse rotation, the drums (4a) and (4b) operate in the approaching direction to close them.

The drum (4aX4b) opens and closes in this way, but when forming a tire, the D
The positions of L8-1 to DLS-7 are set, and when the drum (4aX4b) reaches the set position, it is detected and a predetermined control operation is performed. DL8-1
-DL8-7 are set by digital switches (aa-1) to (8g-7) according to tire size and the like. In this case, digital switches (88-1) to (88-7)
'! Since i= is used, the accuracy is originally good, and
Setting errors due to individual differences are unlikely to occur, and adjustment is very easy. When the motor 03 rotates in the forward and reverse directions, a rotational output corresponding to the rotational difference between the rotating outer shaft (6) and the rotating center shaft Qll appears on the differential shaft of the differential device, and this differential shaft Q'D rotates in the forward and reverse directions. Therefore, the rotating disk of the pulse encoder (to) is 0.
η rotates to intermittent the light beam from the light emitting diode (to) to the photodiode (to), and an open/close position signal X corresponding to the open/close position of the drum (48X4b) is sent to the input circuit (to). Then, this open/close position signal X is sent to the display drive circuit (b), and the display part (to) is
a) Digitally display the current position of (4b). Therefore, livestock 11. The operator always knows the current absolute position H of the drum (4a)
k can be known. On the other hand, the open/close position signal X is sent to the matching circuits (B9-1) to (89-7), and the signal
) When the position reference signal a set by the predetermined relays (4+-1) to (41-7) k
It activates it. Temporarily, drums (4aX4b)
If it reaches DI, S-5VC, the coincidence circuit (89-
6) is activated, and the relay (41-7) is activated via the coincidence holding relay drive circuit 00, stopping the motor 03 and starting a predetermined shaving operation.

For example, by moving to open and close the drum (4aX4b),
When the rotating disk 01) performs forward and reverse operations as shown in Figure 4 (A), the digital switch (8g-1)
When the setting position of ~ (88-7) is reached, the same figure (13)
An output signal appears as shown in , which controls the specified control. T now.

Power source is IP! If the power is turned off, the information will temporarily disappear, but when the power is turned on again, the information will disappear from the light-emitting diode.
8- 14732 (4) Light beam enters photodiode (2), drum (4a)
The open/close position signal DC'6 indicating the current position 1dt of (4b) is generated, and the digital switches (88-1) to (88a) also generate position reference signals a1 to "rf, so information will not be lost. do not have.

Note that the rotation sensor may be of any type as long as it can memorize the rotational position, and for example, a rotary variable resistor or the like may be used.

According to the present invention, the open/close position of the drum is detected by a rotation sensor, the open/close position signal is sent from the input circuit to the display drive circuit, and the open/close position is digitally displayed on the display, so the absolute position of the drum is always displayed. Is possible. In addition, this open/close position signal and the position reference signal set by the digital switch are sent to a matching circuit, and when the two match, it is determined that the drum has reached the predetermined position and the relay is activated, which is different from the conventional rotary The detection accuracy of the drum open/close position is better than that using a cam switch. Moreover, since it uses a digital switch, there are no variations in settings! 1B It is easy to set up, allows efficient changes in tire size, etc., and can be expected to improve the quality of the product. In addition, the rotation sensor has a memory type and uses a digital switch for setting, so even if a power outage occurs, when the power is turned on again, the information from before the power outage will be output and the current position of the drum will be reproduced. This eliminates the need to return the drum to its origin and reset it to zero, and prevents tires from becoming defective.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the tire forming operation, Figs. 2 to 4 illustrate an embodiment of the present invention, Fig. 2 is a sectional view of the main parts of the tire forming machine, and Fig. 3 is an electrical system diagram. The block diagram and FIG. 4 are operation explanatory diagrams. (2)...Green tires, (3)...Prada-1
(4aX4b)...drum, (7)...rotating outer shaft,
αυ...Rotating center shaft, (To)...Motor, (A)...
・Differential device, ■D...Differential axis, (to)...Bass encoder, (to)...Input circuit, (to)...Display section, ■...Display driver 1 Circuit, (aS-1) ~ (ss
-y)...Digital switch, (89-1) to (8
9-7)... Matching circuit, (41-1) to (41-7)
···relay.

Claims (1)

[Claims] 1. In a tire molding machine, a pair of drums supporting a bufder can be opened and closed in a precise direction by the rotation of a rotary shaft, in which a memory-type rotation sensor linked to the rotary shaft detects the opening/closing position of the drum, and The open/close position signal from the sensor is sent to the display drive circuit via the input circuit, the open/close position of the drum is digitally displayed on the display, and the open/close position signal set in advance by the digital switch and the open/close position from the input circuit are displayed digitally. A method for controlling the opening/closing position of a drum of a tire molding machine, characterized in that the position reference signal and the opening/closing position signal are sent to a matching circuit, and when the position reference signal and the opening/closing position signal match, the relay is operated via a relay dry circuit.