JP2005160793A - Showcase - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a show case which can detect the condition that the double-sliding doors which automatically open and close with a motor are in a halt because of obstacles, in an easy structure, at low cost and without barring miniaturization. <P>SOLUTION: A DC motor 9 is attached to a guiding pulley 3 of a wire of an item case 1 which makes double-sliding doors 2 open/close by a motor 4 through the wire 5 linked to the door 2. And, it detects if the door 2 stops with obstacles or not, according to an output of the DC motor 9 when the wire 5 turns for opening/closing the door 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a showcase that electrically opens and closes a sliding door.

  There is a neta case 1 as shown in FIG. For example, as shown in FIG. 4, the front case 1 is formed of transparent glass or the like on the front side of the case 1 and is provided with a sliding door 2 on the back side as shown in FIG. Install it on the counter. Then, sushi items are arranged in the case, and when a customer sitting on the counter chooses a favorite item, the selected material is held on the spot and served to the sushi.

  By the way, in the above-mentioned material case 1, in order to prevent the deterioration of the material, it is desired to minimize the temperature rise in the case due to the opening of the door 2. In addition, there is a problem that it is desirable to avoid touching the door 2 directly and contaminating hands with various germs as much as possible.

  Therefore, the applicant proposed a refrigerated showcase as shown in FIG. 6 according to Japanese Patent Application No. 2002-238964. This showcase is provided with a sensor switch (a non-contact sensor such as an optical sensor) 14, and the door 2 opens when a hand is brought close to take out the material. The sliding door 2 is opened and closed.

  Therefore, as shown in FIG. 6, the wire 5 is hung (via the motor pulley) on the motor 4 disposed on the side of the case via the guide pulley 3 provided on the upper portion of the case, and the wired wire is passed. 5, the sliding door 2 is locked by the engaging member 6 (only the right door 2 is shown in FIG. 6).

  Further, an origin sensor (for example, a limit switch) 7 that operates in a state in which the door is closed is provided on both sides of the opening to which the door 2 is attached. Thus, when the origin sensor 7 is operated, the fact that the door 2 is closed is fed back to the microcomputer 8 to stop the output to the pulse motor 4, or the closed state of the door is detected by the operation state of the origin sensor 7. A number of pulses are output to the pulse motor 4 so that the door 2 can be opened. If the opening / closing mechanism is simplified in this way, the size can be reduced, and the inside of the case can be used widely. In addition, since the mechanism is simple, there is an advantage that the cost can be reduced.

  However, in the opening / closing mechanism as described above, when an obstacle such as a jumping out material or a hand hits the door being opened and closed, the pulley is idle (finally the motor pulley is idle) and the door is opened. Although the motor stops, the microcomputer outputs only a predetermined number of pulses regardless of whether the motor is idling. Therefore, there is a problem that the door cannot be opened to a predetermined state.

  In addition, even if the material etc. gets in the way and the door 2 does not close and the temperature inside the case rises, the microcomputer has no way of detecting that the door will not close, so there is a problem that it will be left until people notice it is there.

  At this time, for example, it is conceivable to detect the position where the door stops using a pulse motor with a position sensor such as a potentiometer. However, if the motor runs idle, the potentiometer also rotates, so the correct position cannot be detected. In addition, the potentiometer is expensive and the shape of the motor becomes large, so that there is a problem that the size cannot be reduced.

  Therefore, an object of the present invention is to enable detection of a state in which a door is stopped with a simple mechanism at low cost and without preventing miniaturization.

  In order to solve the above problems, in the present invention, in a showcase in which a sliding door is opened and closed by a motor via a wire connected to the door, a generator is engaged with the wire, and the output Based on this, a configuration was adopted in which it was detected that the door had stopped.

  By adopting such a configuration, when the door is stopped by an obstacle, the motor runs idle and the wire stops. Then, since the generator output is lost, it can be detected that the generator has stopped. At this time, the generator only needs to generate a voltage, so that it can be realized, for example, with a simple power generation mechanism, can be reduced in cost, and can be easily downsized.

  At this time, the generator may be attached to a wire guide pulley.

  By adopting such a configuration, the generator and the wire can be easily engaged.

  Moreover, the structure which made the said generator contact | connect a wire via the pulley for engagement is employable.

  By adopting such a configuration, the installation of the generator can be freely determined along the wire, which is advantageous for further miniaturization.

  Furthermore, a configuration in which the generator is a small motor can be employed.

  By adopting such a configuration, a general-purpose small motor is used for the generator, so that the cost can be further reduced, and if a general-purpose one can be used, it is easy to obtain and is advantageous for maintenance. is there.

  By configuring as described above, it is possible to detect a state where the door is stopped with a simple mechanism at low cost and without hindering downsizing. Therefore, the door can be opened and closed reliably.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 schematically shows an opening / closing mechanism of a showcase (material case) 1 of the present application.

  That is, the material case 1 is the same as that shown in FIG. 4, and a guide pulley 3 is provided on the upper part of the case (only the right door is shown in FIG. 1), and the motor 4 arranged on the side of the case. A wire 5 is hung on the wire 5 (via a motor pulley), and the door 2 is locked by an engaging member 6 to the wire 5 that is hung.

  In addition, an origin sensor (for example, a limit switch) 7 that operates when the door 2 is closed is also provided on both sides of the opening to which the door 2 is attached. Is.

  Here, a speed detection generator 9 is connected to the microcomputer 8 via an interface circuit 10 as shown in FIG. In this embodiment, a DC motor 9 is used for the generator, the shaft of the motor 9 is attached to the shaft of the guide pulley 3, and the mechanical energy of the pulley 3 is converted into electric energy as a generator. I am letting. At this time, the DC motor 9 to be used only drives the electronic elements of the interface circuit 10 and the output is very small. Therefore, in this embodiment, a small motor is used as an inexpensive sensor instead of the generator. ing.

  The interface circuit 10 uses, for example, a bidirectional photocoupler 11 in which anodes and cathodes of two light emitting diodes are connected as shown in FIG. By doing so, the rotation direction of the guide pulley 3 is reversed with the opening and closing of the door 2, so that the detection can be made even when a voltage having a reversed polarity is induced in the DC motor 9.

  R1 and R2 are current limiting resistors, R3 is a resistor for pulling up the output of the photocoupler 11 to the power source and matching it with the input of the microcomputer 8, and R4 and C1 are low-pass filters.

  This configuration is configured as described above. When the microcomputer 8 operates the pulse motor 4 to open and close the door 2, the pulse pulley 4 is rotated by the pulse motor 4, the wire is pulled, and the door 2 moves. . At the same time, the DC motor 9 attached to the guide pulley 3 also rotates to output an induced voltage, and the output induced voltage is input from the photocoupler 11 to the microcomputer 8 via the low-pass filters R3 and C1. At this time, the input level to the microcomputer 8 is pulled up to the power supply voltage of the microcomputer 8 by the resistor R3 of the interface circuit 10, but becomes "low" level, and the microcomputer 8 can detect that it is operating normally.

  Now, when the material or the like is caught on the door 2 and stopped, the pulse motor 4 slips and the wire 5 stops, so the guide pulley 3 also stops and the rotation of the DC motor 9 also stops. Then, since the DC motor 9 does not generate electricity, the output voltage is lost, and the output to the photocoupler 11 is also turned off. Then, since the input of the microcomputer 8 pulled up by the resistor R3 becomes “high” level, the microcomputer 8 can detect that the door 2 has stopped. Therefore, for example, the microcomputer 8 reverses the pulse motor 4 to return to the origin, corrects the positional deviation due to the slip, or allows the microcomputer 8 to notify that the door 2 is in the stopped state. Can be prevented.

  In this way, it is possible to detect a state where the door is stopped with a simple mechanism at low cost and without hindering downsizing.

  In this embodiment, an induction motor (AC motor) 9 'shown in FIG. 3 is used instead of the brushed DC motor 9 shown in FIG.

  The thing of FIG. 3 is a three-phase induction motor, When using induction motor 9 'in this way, the output of two phases of three phases is used. Since this output generates voltages in both positive and negative directions even in the same rotation direction, a full-wave rectified signal using the bridge circuit 12 is input to the photocoupler 11 ′ of the interface circuit 10. Therefore, a unidirectional photocoupler 11 'is used.

  Other configurations and functions and effects are the same as those described in the above embodiment, and are therefore omitted.

  In this embodiment, as surrounded by a one-dot chain line in FIG. 1, a generator (here, an induction motor is used, but a DC motor 9 or the like) 9 ′ is used for engagement with the wire 5. The pulley 3 ′ is in contact with the attachment wire 5, and the detection is attempted by arranging the pulley 3 ′ in the drive system of the wire 5 in this way.

  In this way, the arrangement of the generators 9 and 9 ′ can be freely set along the wire 5, which is advantageous for downsizing.

  Other configurations and operational effects are the same as those of the above-described embodiment and Example 1, and thus the description thereof is omitted.

  In the embodiment, the neta case has been described. However, the present invention is not limited to this, and can detect the stoppage of the sliding door using a wire, so that the automatic opening / closing system of the sliding door using a similar mechanism is sandwiched. It can be used for detection.

Schematic diagram of the opening and closing mechanism of the embodiment Interface circuit of embodiment Example 1 interface circuit A perspective view of a conventional material case Rear view of conventional material case Schematic diagram of a conventional opening / closing mechanism

Explanation of symbols

1 Neta case 2 Door 3 Pulley for guide 3 'Pulley for engagement 4' Stepping motor 5 Wire

Claims (4)

In a showcase where the sliding door is opened and closed by a motor via a wire connected to the door.
A showcase in which a generator is engaged with the wire to detect that the door has stopped based on its output.   The showcase according to claim 1, wherein the generator is attached to a wire guide pulley.   The showcase according to claim 1, wherein the generator is brought into contact with a wire via an engaging pulley.   The showcase according to claim 1, wherein the generator is a small motor.

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