Zulur When the tire vulcanizing machine should be kept open at a time of starting-up or for a certain reason, an operator causes another vulcanizing sequence time to ;neumatic operated so as to prolong vulcanizing time. Thus, when it is found by comparison of the measured value with the preset value of the temperature and pressure of the vulcanizing medium selected according to a step signal from the sequence timer that the former is deviated from an allowable value, an alarming signal is automatically outputted. Further, it is another object of the present invention to provide a control apparatus for a vulcanizing machine which assures that tires are vulcanized under constant working conditions at all times with an improved quality of tires. This machine is compact in size and semi-automated one.
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Zulur When the tire vulcanizing machine should be kept open at a time of starting-up or for a certain reason, an operator causes another vulcanizing sequence time to ;neumatic operated so as to prolong vulcanizing time. Thus, when it is found by comparison of the measured value with the preset value of the temperature and pressure of the vulcanizing medium selected according to a step signal from the sequence timer that the former is deviated from an allowable value, an alarming signal is automatically outputted.
Further, it is another object of the present invention to provide a control apparatus for a vulcanizing machine which assures that tires are vulcanized under constant working conditions at all times with an improved quality of tires. This machine is compact in size and semi-automated one. The vulcanize tube side is kept above the heating coil.
It should be noted that keying on the data key board 3 may be carried out, for autpmatic, by means of hexadecimal numerals or symbols and displaying on the displaying devices may be carried out by way of combination of the illumination of seven segment elements.
Now, the present invention will be described in greater detail below with reference to FIGS. Thus, the selected function signals from the function output mechanism 64 and ON signals from the pressure switches for detecting function pilot mchine i. Since they have a limited capacity, two sheets of magnetic cards are usually used, wherein one of them has step, time and function data for controlling medium in a tire stored therein and the other one has has pressure conditions in a tire, jacket temperature and others stored therein.
In our project, the heat sensor temperature is varied by adjusting the variable braking system. However, drawbacks have been found inherent to the conventional function control mechanism in that the whole vulcanizing pneumatuc is controlled with great difficulties and thereby uniform quality of tires is difficult to achieve. As a number of machines are operated by a single operator due to the recent wide popularization of automatic operation, there is a tendency to hfat many recording instruments insufficiently and therefore malfunctions are found out with much delay.
Next, description will be made as to vulcanziing preferred embodiment of the molding die temperature control system with reference vulcanizinng FIG. The time display shifting switch 12 is operated to selectively display step time, total vulcanizing time, residual vulcanizing time, vulcanization prolonging time or the like on the displaying device 10 on the basis of the aforesaid preset values and the results of processing carried out with the aid of a microcomputer incorporated in the sequence timer unit 1.
It should be noted that the vulcanizing sequence timer unit TM is constructed in a manner well known by any expert in the art and therefore its description will not be required. As tire size changes, the steps and functions as typically illustrated in FIG. As a vulcanizing operation start signal 60 is inputted, the time generator 61 in the sequence timer III initiates time measurement and function signals 67 outputted for the purpose of introducing vulcanizing medium via the microcomputer 62 for each of the steps as preset by the card 66 so as to allow the group of control valves 69 to be opened and closed successively whereby vulcanizing medium 70 is introduced into a tire to be vulcanized in accordance with the steps as preset by the card.
Further, an arrangement may be made such that an alarming signal is issued from the alarm 36 when the temperature difference is in excess of the predetermined allowable extent.
Next, description will be made as to the control of vulcanizing time where temperature decreases due to heat radiation from a molding die while the latter is kept open for a long period of time. The present invention relates to a control apparatus for a vulcanizing machine of the type in which vulcanizing is effected by introducing the vulcanizing medium into a rubber made product placed in a molding die on the vulcanizing machine and then discharging the same therefrom to vulcanize said rubber made product.
In the above-described embodiment the recording and adjusting instrument 53 has both functions of recording and adjusting. Next, in step 3 cooling water is introduced for one minute. Method for controlling the state of vulcanization of wheel tires and apparatus therefor.
Automatic thermostat is used to maintain the particular temperature The force required to operate this system is low.
Prior to initiating introduction or discharge of heating medium such as hot water, steam or the like at higher temperature and pressure into or from a tire mounted on the tire vulcanizing machine with the aid of the control apparatus of the invention as constructed in the above-described manner, it is necessary to prdetermine working time in each of the steps and moreover a temperature of steam in the hot plate mahine serves to heat a molding die or a temperature of steam in a jacket when the latter is incorporated in the molding die.
As already described above with reference to FIG. When a tire T made of rubber is to be vulcanized in a molding die designed in a split type comprising an upper die half a and a lower die half b as illustrated in FIG. Further, a detector 71 for detecting the temperature or pressure of the vulcanizing medium is disposed in a tire or at the position located midway of a piping extending thereto so that detected value 72 of the detector 71 and preset value 74 of the presetting device 73 are compared with one another with the aid of a comparator 75 incorporated in the microcomputer The control apparatus as defined in claim 5, wherein said means for outputting function signals from said vulcanizing sequence timer are a plurality of electromagnetically operated valves.
As described above, each of predetermined step times is processed by means of a processing function and timing function of the microcomputer incorporated in the sequence timer unit 1 and it is possible to extract the total time through the whole steps, elapsed time in the course of vulcanization, residual working time in the latter, elapsed time in each of the steps, residual working time in the latter and others in the form of an outgoing output in depending on how the soft wear in the microcomputer is designed.
Further, due to limited capacity of a universal type card the latter may be divided into two parts, one of them being for the purpose of presetting step time and function and the other one being for the purpose of presetting the temperature and pressure of vulcanizing medium, so that an occurance of incorrect presetting is prevented by means of recognition data such as vulcanizing specification number or the like.
The air is auromatic in an air compressor and from the compressor plant the flow medium is transmitted to the pneumatic cylinder through a well laid pipe line system. Because it takes long time until output presetting is achieved, incorrect presetting tends to occur and presetting is effected only at the position where a sequence timer is disposed. Specifically, the sequence timer unit 1 comprises a card reader 2, a data key board 3, a control key board 4, a connector 5, autonatic 8, 9, 10 and 11, a time display shifting switch 12, a mode shifting switch 13 and a jot switch 14 each of which will be described later.
As will be described later, the displaying devices 8, 9, 10 and 11 are adapted to display a number of preset values such as vulcanizing specification number, step number, step time, function number, inner pressure condition, platen temperature, platen condition and others. In practice, about kinds of tire specifications are available with respect to passenger car tires.
At the same time the vulcanizing medium temperature and pressure signals 72 in a tire or a piping extending thereto are inputted into the comparator 75 as they are detected by means of the vulcanizing medium detector However, drawbacks have been found with respect to the prior proposals in that an apparatus is a complicated structure and manufactured at a high cost with reduced reliability.
The optimum position is difficult to preset. Further, due to the necessity for changing vulcanizing time in summer and winter seasons there is a tendency to cause the timer presetting specification to become complicated. As described above, the molding die heating temperature is preset and controlled corresponding to the tire specification while a pair of usng medium step and function are preset. This process employs the technique known as compression molding, where the rubber article is intended to adopt the shape of the mold.
Automatic Pneumatic Vulcanizing Machine Using Heat Sensor
Kizragore Thus, the selected function signals from the function output mechanism 64 and ON signals from the pressure switches for detecting function pilot pressure i. The control hear as defined in claim 5, wherein said temperature and pressure are preset for each sequential operational sdnsor step of introducing and discharging said suing medium. When data input is normally carried out merely by means of the data key board 3 during data preparation, it is necessary to discriminate input for preset data but this is inconvenient when many kinds of data should be preset. Signals from said pressure switches 80 are delivered to a comparision mechanism 81, while function signals selected at each of the steps are delivered thereto from the function output mechanism Next, description will be made as to a preferred embodiment of the molding die temperature control system with reference to FIG.
Pneumatic Vulcanizing Machine Using Heat Sensor
Baran Automatic pneumatic vulcanizing Machine using heat sensor. Due to the fact that there usng a time lag between pressure raising until pilot air pressure to be delivered to the group of control valves 69 is raised up to a predetermined pressure and outputting of function signal it is preferable to make comparison therebetween by means of a timer in the comparison mechanism 81 or alarming mechanism 82 ueat a certain period of time has elapsed. Further, since the temperature and pressure conditions are preset as required for any vulcanizing medium to be introduced and discharged irrespective of employed steps, it is assured that the preset values are kept fixed even when vulcanizing conditions vary due to a change of tire size or the like reason. Further, usihg is possible to employ punched card or the like means having the same function instead of a magnetic card. With respect to the arrangement of various kinds of converters which may be required to equalize level of each of the inputs and outputs and occurance of deviation of temperature and pressure of vulcanizing medium from their preset values during the beginning time or due to occurance of momentary peak value they are usually neglected as long as no practical trouble takes place. It is another object of the present invention to provide a control apparatus for a vulcanizing machine which assures that the presetting and controlling of molding die heating temperature are automatically carried out without a malfunction such as incorrect presetting or the like. On the other hand, when they are not identical, an alarming signal 82 is issued whereby an alarm such as a buzzer or the like is actuated or automatic operation is caused to stop.