JPH06101062B2 - Vending machine syrup pump - Google Patents

Description

TECHNICAL FIELD The present invention relates to a syrup pump used for delivering syrup or the like in a drinking water vending machine.

2. Description of the Related Art A syrup pump of this type is constructed as shown in FIG. The diaphragm 3 is sandwiched between the pump body 1 and the cover 2, and they are integrally connected. The pump body 1 is provided with a suction port 4 and a discharge port 5, and check valves 6 and 7 are provided respectively. A drive shaft 9 is rotatably attached to a support frame 8 fixed to the outside of the cover 2, and the drive shaft 9 is driven by a motor (not shown) attached to the back surface of the support frame 8. A cam 10 is attached to the drive shaft 9, and a crank pin 11 fixed to the cam 10 and a pin 13 fixed to a transmission member 12 fixed to the diaphragm 3 are connected by a link 14. Therefore, when the drive shaft 9 is rotationally driven by the motor, the cam 10 rotates and the transmission member 12 reciprocates in the direction of the arrow A through the link 14, and when the diaphragm 3 moves backward in the direction of the arrow B, the suction port 4 moves. The syrup is sucked, and the sucked syrup is discharged from the discharge port 5 when the diaphragm 3 moves forward in the direction of arrow C.

In the conventional configuration as described above, the rotation time of the motor per one selling operation is constant, and the syrup discharge amount is preset to a necessary amount by changing the shape of the cam 10.

However, such mechanical setting work of the syrup discharge amount is troublesome and the workability is poor.

An object of the present invention is to provide a syrup pump capable of electrically adjusting the syrup discharge amount.

Means for Solving the Problems A syrup pump of the present invention is a syrup pump that transports syrup by reciprocally moving a diaphragm, a drive unit for reciprocating a diaphragm, a screw shaft that is rotationally driven by a motor, and this screw shaft. A nut member that is screwed onto the slide member and is slidable in the reciprocating direction of the diaphragm, and a transmission member that extends in the reciprocating direction of the diaphragm and has one end connected to the diaphragm and the other end connected to the nut member. And rotation detecting means for outputting a pulse signal in accordance with the rotation of the screw shaft, and in the forward path for driving the diaphragm, the pulse signal generated from the rotation detecting means is equal to the specified pulse number according to the required syrup amount. The motor is driven in the forward direction, and the pulse from the rotation detection means And a control unit that turns off the power supply to the motor when the control signal is not detected.

Action According to this configuration, when the motor is driven in the normal direction, the screw shaft rotates, and the nut member advances in the direction approaching the diaphragm. When the nut member advances, the diaphragm, for example, the central portion is pushed out via the transmission member, and the syrup is gradually pushed out. When the motor is rotated, pulse signals are successively generated from the rotation detecting means as the motor rotates. The control unit
The pulse signals are counted and compared with a specified value. When the counted value reaches the specified value, the motor is driven in reverse, and the central part of the diaphragm starts to move backward. This retraction causes the syrup to be sucked into the syrup pump.

If an abnormal situation occurs such that the motor locks while the motor is being driven, the control unit detects the occurrence of this abnormal state because the pulse signal is not input for a specified time or longer, and the power to the motor is turned off. Prevent the motor from overheating.

Example Hereinafter, the syrup pump of the present invention will be described based on an example. It should be noted that components having the same functions as those of the conventional example shown in FIG.

FIG. 1 shows the syrup pump of the present invention. A screw shaft 16 that is driven to rotate by a motor 15 is provided at the rear portion of the cover 2. A nut member 17 that is slidable in the reciprocating direction of the diaphragm 3 [direction of arrow D] is screwed onto the screw shaft 16. Reference numerals 18a and 18b are guides for preventing the nut member 17 from rotating. One end of the transmission member 12 is connected to the diaphragm 3, and the projection 12a of the nut member 17 is provided in the hole 12a formed at the other end.
Are engaged, and the transmission member 12 connects the nut member 17 and the diaphragm 3. Reference numeral 19 is a microswitch as a return detecting means for detecting that the nut member 17 has reached the initial position shown by an imaginary line, and 20a and 20b are slit plates and a photo interrupter as rotation detecting means, which are housed in the casing 21 together with the motor 15. When the slit plate 20a rotates as the motor 15 rotates, the photo interrupter 20b
Reads the passage of the slit of the slit plate 20a and outputs a pulse signal. 22 is a motor 15 based on the output signal of the microswitch 19 and the output signal of the photo interrupter 20b.
It is a control unit that determines the energization time to and the energization direction at that time.

Next, the configuration of the control unit 22 will be described in the same order.
When the control unit 22 detects the syrup payout instruction 23, the motor 15 is driven in the normal direction and the number of pulse signals from the photo interrupter 20b is counted and compared with a specified value set according to the required amount of syrup. Here, the count value from time to time is N _S ,
Assuming that the specified value set according to the required amount of syrup is N _R , N _S ≧ N _R is detected and the normal rotation drive is terminated. Then, until the micro switch 19 detects the return of the nut member 17, the motor 15
Drive in reverse.

In this way, each time the syrup payout instruction 23 is detected, the required amount of syrup is discharged from the discharge port 5. Here, since the initial position is restored each time one ejection is completed, the ejection amount for each ejection is accurate.

Further, the control unit 22 counts the intervals of the pulse signals generated from the photo interrupter 20b during the forward rotation or the reverse rotation driving of the motor 15, and when the next pulse signal is not detected even after the lapse of the specified time. The power supply to the motor 15 is terminated, and the sales column using this syrup pump is switched to the sold-out state to prevent an accident due to overheating of the motor 15 and improve safety.

In the above embodiment, the rotation detecting means is described by taking the case where the slit plate 20a is configured with the photo interrupter 20b as an example, but this is the gear attached to the output shaft of the motor 15 and the outer peripheral portion of this gear. A magnetic sensor supported from the fixed side so as to be located close to each other and a permanent magnet for generating a bias magnetic field attached to the fixed side, the magnetic flux of the permanent magnet interlinking with the magnetic sensor as the gear rotates. The same applies to a pulse generator that detects the rotation of the motor 15 by changing the.

EFFECTS OF THE INVENTION As described above, according to the configuration described in each claim, in the syrup pump that reciprocates the diaphragm to transport the syrup, the drive unit that reciprocally moves the diaphragm,
A screw shaft that is rotationally driven by a motor, a nut member that is screwed onto this screw shaft and is slidable in the reciprocating direction of the diaphragm, and a nut member that extends in the reciprocating direction of the diaphragm and has one end connected to the diaphragm. , A transmission member having the other end connected to the nut member, a rotation detection unit that outputs a pulse signal in accordance with the rotation of the screw shaft, and a pulse signal generated from the rotation detection unit in the forward path that drives the diaphragm are required. Drive the motor in the normal direction until it matches the specified number of pulses according to the amount of syrup,
It consists of a control unit that turns off the power to the motor when the pulse signal from the rotation detection unit is not detected for a predetermined time or more during normal rotation drive, so the syrup discharge rate can be adjusted simply by changing the specified number of pulses in the control unit. Can be changed,
In addition, when the motor is locked, the power supply to the motor can be stopped quickly to avoid various accidents due to overheating of the motor, thus improving safety.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the syrup pump of the present invention,
FIG. 2 is a block diagram of a conventional syrup pump. 3 ... Diaphragm, 4 ... Suction port, 5 ... Discharge port, 12
...... Transmission member, 15 …… Motor, 16 …… Screw shaft, 17 …… Nut member, 19 …… Micro switch [return detection means],
20a, 20b ...... slit plate, photo interrupter [rotation detecting means], 22 ... control unit.

Claims (1)

[Claims] 1. A syrup pump for transporting syrup by reciprocally moving a diaphragm, wherein a drive unit for reciprocating the diaphragm is screwed to a screw shaft rotatably driven by a motor and reciprocates the diaphragm. A nut member that is slidable in the direction of movement, a transmission member that extends in the direction of the reciprocating movement of the diaphragm and has one end connected to the diaphragm and the other end connected to the nut member, and the rotation of the screw shaft. The rotation detection means for outputting a pulse signal and the forward path for driving the diaphragm, the motor is driven in the normal direction until the pulse signal generated from the rotation detection means matches the specified number of pulses corresponding to the required syrup amount. When the pulse signal from the rotation detection means is not detected for a predetermined time or more, the motor is energized. Syrup pump constituted by a control unit to turn off.