the present invention includes a control means , a driving means , a sensing means and an alarm means . the control means compares input data with memorized data , and transmits a control signal based on the compared result . the driving means rotates a motor according to the control signal . the sensing means detects the number of rotations of the motor , generates pulse signals corresponding to the number of rotations , and transmits the pulse signals to the control means . the alarm means generates an alarm signal only when the control signal indicates that the motor is not rotating or that a kneading wing is not installed into the container . the control means is a micro computer . the driving means comprises resistors , a condensor , a transistor , a triac and a photo coupler , which and rotates the motor by triggering the triac by the control signal through the transistor and the photo coupler serially . the sensing means includes resistors , a transistor and a sensing device . the sensing device is a photo interrupter , which senses rotation of the motor by means of a rotating member having multiple holes at regular intervals on its periphery and being rotated on the shaft of the motor . referring first to fig1 a circuit diagram ,, of the present invention is shown . it includes a control part 1 as the control means , a driving part 2 as the driving means , a sensing part 3 as the sensing means and an alarm part 4 as the alarm means . the control part 1 is mainly composed of a micro computer micom , which compares input data with memorized data . the driving part 2 rotates a motor m according to the transmitting signal of the control part 1 , which includes a triac t1 , a transistor q1 , resistances r1 - r4 , a condenser c1 and a photo coupler pc1 . the sensing part 3 comprises a sensing device pc2 inclusive of a light emission diode led2 and a light receiving device ptr , a transistor q2 and resistances r5 - r7 , which generates a pulse signal owing to a revolution detecting of the motor m , and which transmits the pulse signal to the control part 1 . the alarm part 4 includes a resistor r8 , a transistor q3 and a buzzer bz , which receives an output from the control part 1 in case that a kneading wing is not installed in a container , and which generates an alarm based on to the output of the control part . the photo coupler pc1 is composed of a light emission diode led1 as a light emitting device and a diac d1 as a light receiving device . the sensing device pc2 is a photo interrupter having a light emission diode led2 as a light emission device and a photo transistor ptr as a light receiving device . r9 is a resister and sw1 is a switch . vcc is a supplied power , ac is a plug , in1 is an input terminal which receives a signal of the sensing parts 3 , in2 is an input terminal which receives a signal of the switch sw1 , out1 is an output terminal which transmits a signal for rotating the motor and out2 is an output terminal which transmits a signal of alarm to the buzzer . in fig2 a rotating member 5 as a disc type is fixed at a rotation shaft end of the motor and a c - shaped sensing device pc2 is fixed on the motor m enough to pass the edge parts of the rotating 5 therein . the edge has multiple hole means 5b at regular intervals and the edge is fixed at the periphery of a rotating disk 5a . the sensing device pc2 is turned on and off repeatedly by the rotation of hole means 5b . upper and lower parts of the sensing device pc2 have a light emission diode led2 and a light receiving device ptr respectively . in fig3 a container 7 is shown as a state that materials for kneading is full . a kneading wing 6 is fixed on the inner bottom of the container 7 and a driver gear 8 for driving the kneading wing 6 is attached at the outer bottom of the container 7 . fig5 is a front view for illustrating the present invention . a kneading wing 6 is attached in the container 7 and the driver gear 8 rotates the kneading wing 6 from the rotation of the motor m through a belt 10 . the motor m has a protruded shaft up and down , the lower part of the shaft 9 drives the belt 10 and the upper part of the shaft 9 drives the rotating member 5 . four parts of fig1 are omitted in fig5 except sensing device pc2 . operations of the present invention are illustrated with a flow chart of fig4 . many materials such as flour , egg , water , etc . are put in the container 7 and the belt 10 connects the shaft 9 and the driver gear 8 for transmitting rotation of the motor m . at that time , switch sw1 is turned on by user and then , power vcc is supplied into the micro computer micom through input terminal in2 and the control part 1 of micro computer micom starts a memorized program as the flow chart of fig4 . if kneading does not start as in step 1a , it is a state that the switch sw1 is not turned on and as indicated in function routine as in step 3a . if kneading start 5 , it operates next step 2a . in step 2a , micro computer micom outputs high level from output terminal out1 to a base of the transistor q1 through resistance r1 and the transistor q1 is turned on and also photo coupler pc1 is turned on . the diac di current of the photo coupler pc1 triggers the gate of the triac t1 and power is supplied from plug ac into the motor m by the triac t1 . resistances r3 and r4 and condenser c1 are for the protection of the triac t1 and the other resistances r1 and r2 are for biasing of the transistor q1 . as motor m is turned on , the rotating member 5 inclusive of rotating disk 5a and hole means 5b is rotated by the shaft 9 . the shaft 9 also rotates the kneading wing 6 through the belt 10 as in fig5 . as the c - shaped sensing device pc2 has a light emission diode led 2 and photo transistor ptr respectively up and down , the light from the light emission diode led2 is passed to the photo transistor through the hole means 5b or is intercepted by the edge parts of the rotating member 5 exclusive of the hole means 5b . as photo transistor ptr is turned on , the transistor q2 is also turned on . if transistor q2 is turned on and off repeatedly , a rectangular pulse signal is generated and is supplied into the input terminal in1 of micro computer micom . the micro computer counts the input pulse signal which is generated from counting of revolution numbers of the motor m at the sensing parts 3 . the micro computer micom of control part 1 counts input pulse signal for 5 seconds from step 4a to step 7a . if a counting time of the input pulse from the sensing parts 3 is over 1 second as in step 4a , a counter of the micro computer micom increases 1 as in step 5a and then , counts the input signal from input terminal in1 as in step 6a . if a counting time of the input pulse is not over 1 sec , it counts only pulse numbers continually without increasing of the counter as in step 6a . if counter doesn &# 39 ; t indicates 5 i . e . 5 seconds , it returns to step 4a and repeats from step 4a to step 7a . in step 8a , npls is the counted pulse data for 5 seconds in kneading materials with kneading wing , spls is lower limit value of the memorized pulse data for 5 seconds and fpls is upper limit value of the memoried pulse data for 5 seconds . if the kneading wing 6 is not placed into the container 7 , the shaft 9 of motor m will rotate faster than when the kneading wing 6 is placed into the container 7 . fpls is a memorized upper limit value for 5 seconds when the kneading wing 6 is installed into the container 7 . spls is a memorized lower limit value for 5 seconds when the rotation of kneading wing 6 is the lowest value . if the counted data mpls for 5 seconds from the revolution of the motor m is between the memorized limit values fpls and spls , micro computer micom decides a normal state that the kneading wing 6 is installed into the container 7 and then , performs next routine . if the counted data npls for 5 seconds is higher than the upper limit value fpls or the data is lower than the lower limit value spls , micro computer micom decides error states which the motor m is not rotated or which the kneading wing 6 is not placed into the container 7 . so micro computer micom transmits high level from output terminal out2 to the transistor q3 of alarm part 4 through resistance r8 and the buzzer bz rings as the transistor q3 is turned on . also , micro computer micom transmits low level to the driving part 2 through output terminal out1 so , the driving part 2 inclusive of the motor m can &# 39 ; t be operated . as mentioned above , present invention generates a pulse signal according to the revolution of the motor and the pulse signal is compared with the memorized pulse signal . if said compared value indicates that the kneading wing is not placed in the container or the motor is out of order , the buzzer is rung by the compared data .