JPH0513532U - Pressing force synchronous variable speed agitator - Google Patents

Abstract

(57) [Summary] [Purpose] Hold the physics and chemistry equipment such as a test tube into which the liquid to be stirred is held with one hand, and adjust the vibration frequency of the physics and chemistry equipment with one hand while checking the stirring state. To be able to. A stirrer comprising: a rotating shaft that is rotationally driven; a vibrating shaft that is eccentrically connected to the rotating shaft; and a receiver that is provided on the vibrating shaft and that receives a physics and chemistry device such as a test tube. According to the pressing force of the physics and chemistry equipment against the receiver, the rotary shaft is moved downward through the receiver and the vibration shaft, and the light shielding plate is moved in conjunction with the downward movement of the rotary shaft. By changing the amount, the number of rotations of the rotary shaft is controlled according to the variable amount.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pressing force synchronous variable speed agitator that agitates for mixing physicochemical equipment, for example, liquids injected into a test tube.

[0002]

[Prior Art]

 As a conventional stirrer of this kind, the one described in Japanese Utility Model Publication No. 2-7630 already proposed by the present applicant is known. The stirrer described in the publication is a stirrer in which a vibrating shaft is provided eccentrically with respect to the rotating shaft of a motor, and a receiving member for receiving physical and chemical equipment such as a test tube is provided on the vibrating shaft. One piece is provided, and the supporting rollers are arranged so as to be sandwiched on both sides of the guide tongue piece. Then, when the physical and chemical equipment is placed on the receiver, the weight of the physical and chemical equipment causes the receiver to press the rotary shaft via the vibration shaft, and as a result, the micro switch attached to the lower end of the rotary shaft is turned on. Now drive the motor. When the motor is driven, the rotary shaft rotates, but since the rotary shaft and the vibrating shaft are eccentric to each other, the vibrating shaft vibrates according to the amount of eccentricity. When the vibrating shaft vibrates, the receiver vibrates and the physics and chemistry equipment also vibrates, thereby stirring the liquid inside. The receiving member is configured such that both ends of the guide tongue are supported by supporting rollers to guide the vibration.

[0003]

[Problems to be solved by the device]

 However, in the conventional stirrer described above, when the frequency is adjusted according to the viscosity and other properties of the liquid injected into the physics and chemistry equipment such as a test tube, the amount of injection, and the desired stirring state, the receiver can be held with one hand. It is necessary to hold the placed physics and chemistry equipment and operate the adjustment knob while confirming the stirring state of the liquid in the physics and chemistry equipment with the other hand, which means that both hands must be used at once. The nerves for the operation concentrate on one hand, which causes inconveniences such as the operation of the other hand being cluttered, and it is not convenient for use.

In view of the above circumstances, the present invention responds to various conditions such as the properties of the liquid injected into the physicochemical equipment with one hand while the physicochemical equipment is placed and held on the receiving tool with only one hand. The purpose of the invention is to provide a pressing force synchronous variable speed agitator in which the vibration frequency can be arbitrarily set.

[0005]

[Means and Actions for Solving the Problems]

 The present invention has been made to achieve the above object. According to claim 1, a rotary shaft that is rotationally driven, a vibrating shaft that is eccentrically connected to the rotary shaft, and a vibrating shaft are provided. In a stirrer equipped with a receiver for receiving physics and chemistry equipment such as a test tube, the rotary shaft is moved downward via the receiver and the oscillating shaft in accordance with the pressing force of the physics and chemistry equipment on the receiver, Correspondingly, the light-shielding plate also moves, and the amount of light received by the light-receiving element changes in response to the movement of the light-shielding plate, and the rotation speed of the rotating shaft is controlled according to the change in the amount of light-receiving of the light-receiving element. It was done. According to a second aspect of the present invention, a light shielding plate that changes the amount of light received by the light receiving element by the pressing force applied to the receiver by the chemical instrument of the first aspect is provided on the rotary shaft. According to a third aspect of the present invention, an end portion of the light-shielding plate of the first or second aspect which shields the light-receiving element from light reception is provided with an oblique angle with respect to the movable direction of the light-shielding plate.

[0006]

【Example】

 An embodiment of a pressing force synchronous variable speed agitator according to the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment, in which 1 is a case and 2 is a leg seat. An AC motor 3 such as a corner picking motor is installed in the case 1. The rotating shaft (output shaft) 4 of the AC motor 3 can move up and down by a predetermined amount. A connecting block 5 is fixed to the upper end of the rotary shaft 4 as in a conventional stirrer, and a bearing 6 is fitted in the connecting block 5. That is, the connecting block 5 is fixed to the outer race of the bearing 6, the vibrating shaft 7 is fixed to the inner race of the bearing 6, the vibrating shaft 7 is projected above the connecting block 5, and the case 1 It is exposed to the outside of the through hole 1a. The rotary shaft 4 and the vibrating shaft 7 are eccentric with respect to each other by a predetermined distance. With respect to this eccentricity, when the bearing 6 is attached to the rotary shaft 4, the center of rotation between the bearing 6 and the rotary shaft 4 is displaced by a predetermined amount so as to be eccentric. A receiver 8 is attached to the upper end of the vibration shaft 7. The receiving member 8 is formed with a receiving recess 10 for mounting a physics and chemistry equipment such as a test tube 9 on its upper surface. Further, a guide tongue piece 11 that projects horizontally is provided on a side portion of the receiver 8. The guide tongue piece 11 has a pair of two guide rollers 12 slidably contacting both side ends thereof to guide the operation of the receiving member 8 during vibration. Each guide roller 12 is rotatably supported on the upper surface of the case 1. The lower end of the rotating shaft 4 of the AC motor 3 is formed in a hemispherical shape while protruding further downward from the bearing 13, and the lower end of the hemispherical shape is brought into contact with the shaft support boss 14 so as to contact the shaft support boss 14. The frictional resistance associated with the contact reduces the load on the rotating shaft 4. When it is difficult to process the lower end of the rotating shaft 4 into a hemispherical shape, a steel ball 15 may be interposed between the lower end of the rotating shaft 4 and the upper end of the shaft support boss 14 as shown in FIG. The shaft support boss 14 is hardened mechanically against contact with the rotating rotary shaft 4 so as to smoothly rotate the rotary shaft 4. The shaft support boss 14 is vertically movably fitted in the mounting hole 16a of the mounting support 16 with a spring 17 interposed. The elastic biasing force of the spring 17 is set according to conditions such as the weight of the rotary shaft 4, the vibration shaft 7, and the receiving member 8 and the ease with which the test tube 9 is pressed. A light shielding plate 18 is provided at the lower end of the shaft support boss 14. The lower end of the light shield plate 18, that is, the light shield end surface, has a certain oblique angle with respect to the movable direction of the shaft support boss 14. As shown in FIG. 3, a light-emitting element 19 is disposed on the side of the light-shielding plate 18, and the light emitted from the light-emitting element 19 is emitted toward the light-shielding plate 18 through the light projecting window 20. There is. A light receiving element 21 is disposed with an appropriate gap from the light emitting element 19, and the light emitted from the light emitting element 19 is received by the light receiving element 21 through a rectangular light receiving window 22. That is, the light shielding plate 18 is arranged so that the gap between the light projecting window 20 and the light receiving window 22 can be moved up and down, and the light shielding plate 18 is movable along the light receiving window 22 as shown in FIG. It is designed to block light with a certain angle to the direction. The light emitting element 19 and the light receiving element 21 are connected to the control unit 23. The controller 23 controls the AC motor 3 according to the amount of light received by the light receiving element 21.

As shown in FIG. 5, the control section 23 is configured such that the light emitting element 19 is supplied with power from the constant current control section 24 to emit light, and the light emitted from the light emitting element 19 is shielded by the light shielding plate 18. The output of the light receiving element 21 which is changed and received by is input to the amplification section 25. The amplifier 25 is connected to the voltage-pulse width modulator 26. The voltage-pulse width modulator 26 converts the output voltage value of the amplifier 25 into a pulse width. The voltage-pulse width modulator 26 is connected to the AC motor 3 via the current controller 27. When the current control unit 27 receives the output signal from the voltage-pulse width modulation unit 26, the current control unit 27 changes the current value supplied to the AC motor 3 according to the pulse width of the output signal, thereby rotating the AC motor 3. It controls the number.

Next, the operation of the pressing force synchronous variable speed agitator will be described. A small container such as a test tube 9 or a medicine bottle into which a liquid to be agitated is put is placed in the receiving recess 10 of the receiver 8. Then, the test tube 9 or the like is pressed downward. By this pressing, the rotating shaft 4 also moves downward via the vibration shaft 7 against the elastic bias of the spring 17 by an amount corresponding to the pressing force. When the rotating shaft 4 descends, the light shielding plate 18 also descends to shield the light emitted from the light emitting element 19 entering the light receiving window 22. The amount of light shielded by the light shield plate 18 relative to the amount of movement of the light shield plate 18 has a linearly changing relationship as shown in FIG. That is, the amount of light received changes in proportion to the amount of lowering of the light shielding plate 18, and the amount of vibration of the receiving tool 8 also changes in a substantially linear manner accordingly. First, the light-shielding plate 18 starts to descend, and when a certain amount of light is shielded, the control unit 23 drives the AC motor 3 to start the vibration of the receiver 8, and thereafter, the control unit according to the light-shielding amount by the light-shielding plate 18. 23 controls the number of rotations of the AC motor 3, that is, the number of vibrations of the receiver 8. When the light receiving element 21 receives a light receiving amount according to the light blocking amount of the light blocking plate 18, the control section 23 amplifies the output signal of the light receiving element 21 by the amplifying section 25, and then outputs it to the voltage-pulse width modulating section 26. Is entered. In the voltage-pulse width modulation unit 26, the signal sent from the amplification unit 25 is converted into a pulse width according to its voltage value, and then input to the current control unit 27 as a drive circuit. The current controller 27 controls to vary the current value (pulse cycle) supplied to the AC motor 3 according to the pulse width of the signal sent from the voltage-pulse width modulator 26. Therefore, the rotation speed of the AC motor 3 is variable according to the amount of lowering of the light shielding plate 18, that is, the amount of light received by the light receiving element 21. Therefore, since the frequency of the receiver 8 also changes, the operator can check the agitated state of the injecting liquid in the test tube 9 or the like and, while the operator confirms the agitated state of the injecting liquid, the receiver 8 can be moved to the receiver 8 by the test tube 9 or the like to obtain a desired agitated state. The amount of pressing of is arbitrarily set.

In the above embodiment, the AC motor 3 does not start rotating unless the light shield plate 18 shields a certain amount of light. However, when the push button 28 shown in FIG. Regardless, it is possible to rotate continuously, and thereafter, it is also possible to control the rotational speed of the AC motor 3 according to the amount of light shielding by the light shielding plate 18 as described above. The number of rotations of the AC motor 3 corresponding to the above-mentioned light shielding amount is also operated by the setting device 29 for changing the amplification factor of the amplification unit 25 or the setting device 30 for changing the modulation factor of the voltage-pulse width modulation unit 26 shown in FIG. By doing so, it is also possible to make adjustments at will. Further, in FIG. 1, 31 is a fuse.

FIG. 7 shows a second embodiment and shows an example in which the output shaft of the motor cannot be used as it is because it is difficult to move up and down and cannot be pressed by a test tube or the like. The DC motor 34 in which the output shaft 33 is hard to move up and down is installed with the support 32 interposed in the case 1. A rotary shaft 37 rotatably supported by bearings 35 and 36 is installed in parallel with the DC motor 34 on the support 32. The rotating shaft 47 is rotatably supported by the bearings 35 and 36 so that it can move up and down within a predetermined range. A spacer 38 is fitted on the rotary shaft 37 between the bearings 35 and 36 so that the vertical motion of the rotary shaft 37 is not supported. On the upper end of the rotary shaft 37, the connecting block 5, the vibrating shaft 7 and the receiver 8 are mounted in the same manner as in the first embodiment. It is also possible to provide a guide tongue piece 11 on the receiving tool 8 and sandwich both side ends of the guide tongue piece 11 with the guide rollers 12 to guide the receiving tool 8 when it vibrates. It is the same. The lower part of the rotary shaft 37 is connected to the output shaft 33 of the DC motor 34 by a power transmission mechanism 39. Although the power transmission mechanism 39 is composed of the pulleys 40 and 41 and the belt 42, it is also possible to use other known ones. The lower end of the rotary shaft 37 is processed into a hemispherical shape and is brought into contact with the shaft support boss 14. In addition, as a matter of course, as shown in FIG. 2, the steel ball 15 can be interposed between the rotary shaft 37 and the shaft support boss 14. The shaft support boss 14, the light shielding plate 18, the light emitting element 19, the light receiving element 21, and the like are the same as those in the first embodiment.

Next, the operation of the pressing force synchronous variable speed agitator of the second embodiment will be described. First, like the first embodiment, a test tube or the like is placed on the receiving tool 8 and pressed. By this pressing, the rotating shaft 37 is lowered together with the shaft support boss 14 by an amount corresponding to the pressing amount against the elastic bias of the spring 17. Therefore, similarly to the first embodiment, the light shielding plate 18 also controls the light receiving amount of the light receiving element 21 in accordance with the pressing amount, and thus the control unit 23 controls the rotation speed of the DC motor 34. At this time, even if the rotating shaft 37 is lowered by being pressed by a test tube or the like, it is driven by the DC motor 34 while being connected to the output shaft 33 of the DC motor 34 by the bending of the belt 42 of the power transmission mechanism 39. It can rotate. In the control unit 23, as in the first embodiment, the current control unit 27 is connected to the DC motor 34 via the amplification unit 25 and the voltage-pulse width modulation unit 26 according to the amount of light received by the light receiving element 21, as shown in FIG. The value of the electric current to be supplied (the duty cycle of the pulse can be varied) is controlled to control the rotation speed of the DC motor 34.

[0012]

[Effect of the device]

 As described above, according to the pressing force synchronous variable speed agitator according to the present invention, it is possible to confirm the agitation state suitable for various conditions such as the property of the injecting liquid while the physics and chemistry equipment is placed and held on the receiver with one hand. However, it is possible to freely set the frequency of the physics and chemistry equipment by pressing the physics and chemistry equipment with a required amount with one hand. Moreover, since the pressing force of the physics and chemistry equipment against the receiver is converted into an electric signal in a non-contact manner by the light shielding plate and the light emitting element and the light receiving element to control the motor, wear is not caused and durability is improved. It is excellent and convenient to use.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a structure of a first embodiment of a pressing force synchronous variable speed agitator according to the present invention.

FIG. 2 is a cross-sectional view of essential parts showing another modified example between a rotary shaft and a shaft support boss that receives the rotary shaft.

FIG. 3 is a cross-sectional view showing a mutual relationship between a light emitting element, a light receiving element, and a light shielding plate.

FIG. 4 is an explanatory diagram showing a mutual relationship between a light shielding plate and a light receiving window.

FIG. 5 is an electrical block diagram of a control unit.

FIG. 6 is a diagram showing changes in the amount of light received by a light receiving element with respect to the amount of movement of a rotating shaft.

FIG. 7 is a side sectional view showing the structure of a second embodiment of the pressing force synchronous variable speed agitator according to the present invention.

[Explanation of symbols]

 3 AC Motor 4 Rotating Shaft 7 Vibration Shaft 8 Receiving Tool 9 Test Tube 18 Shading Plate 19 Light Emitting Element 21 Light Receiving Element 23 Control Unit 33 Output Shaft 34 DC Motor 37 Rotating Shaft 39 Power Transmission Mechanism

Claims (3)

[Scope of utility model registration request] 1. A stirrer comprising a rotary shaft that is driven to rotate, a vibrating shaft that is eccentrically connected to the rotary shaft, and a receiver that is provided on the vibrating shaft and that receives physical and chemical equipment such as a test tube. In, the light-shielding plate that moves in conjunction with the vertical movement of the receiver by placing the physics and chemistry equipment, the light-receiving element that changes the light-receiving amount according to the light-shielding amount of the light-shielding plate, and the light-receiving amount of the light-receiving element A pressing force synchronous variable speed agitator comprising a control unit for controlling the rotation of a rotary shaft. 2. A rotary shaft that can be moved up and down via a vibration shaft when the receiver is moved up and down by placing the physical and chemical equipment thereon,
2. The pressing force synchronous variable speed type agitator according to claim 1, wherein a light shielding plate for changing the amount of light received by the light receiving element is provided on the rotating shaft. 3. An end portion of the light shielding plate, which is close to a slit serving as a window hole for receiving light from the light emitting element by the light receiver, is formed to be inclined with respect to a movable direction of the light shielding plate. The pressing force synchronous variable speed agitator according to claim 1 or 2.