Abstract:
A paper currency collection detection arrangement used in an automatic vending machine formed of a paper currency receiving unit, a paper currency collection cabinet, and a detection unit. The paper currency collection cabinet has a bottom sensor hole, and a slide moved to close/open the sensor hole subject to the amount of paper currency collected. The detection unit has a sensor controlled to emit signal to the sensor hole and adapted for cutting off power supply when the slide blocked the sensor hole.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to an automatic vending machine and, more specifically to a paper currency collection detection arrangement for an automatic vending machine, which automatically cuts off power supply when the amount of collected paper currency reached a predetermined high level.  
           [0003]    2. Description of the Related Art  
           [0004]    A variety of automatic vending machines have been disclosed for use to sell different consumer goods. Some automatic vending machines accept coins only. Some other automatic vending machines accept paper currency. An automatic vending machine accepting paper currency generally has means to detect the collection of paper currency and to cut off power supply when collected paper currency is full. According to conventional designs, counter means, photoelectric switch means, and micro-switch means are commonly used to detect the collection of paper currency. However, these conventional designs have drawbacks. The use of counter means greatly complicates the circuit design, and its maintenance work is also complicated. The use of photoelectric switch means greatly increases the installation cost. Further, the detection face of photoelectric switch means tends to be covered with dust, resulting in a false action. The use of micro-switch means is not durable. A contact error tends to occur after a long use of micro-switch means. There is also known still another design that uses a solenoid switch and a magnetic device to detect the collection of received paper currency. During operation of the automatic vending machine, the functioning of the solenoid switch tends to be interfered with external noises from surrounding metal members and electronic elements. Further, the magnetic force of the solenoid switch and the magnetic device may deteriorate after a long use, resulting in a low sensitivity.  
         SUMMARY OF THE INVENTION  
         [0005]    The present invention has been accomplished to provide a paper currency collection detection arrangement, which eliminates the aforesaid drawbacks. It is one object of the present invention to provide a paper currency collection detection arrangement, which detects the full collection of paper currency accurately. It is another object of the present invention to provide a paper currency collection detection arrangement, which is durable in use. To achieve these and other objects of the present invention, the paper currency collection detection arrangement comprises a paper currency receiving unit, a paper currency collection cabinet, and a detection unit. The paper currency collection cabinet has a bottom sensor hole, and a slide moved to close/open the sensor hole subject to the amount of paper currency collected. The detection unit has a top sensor hole aimed at the bottom sensor hole of the paper currency collection cabinet, and a sensor mounted on the inside and controlled to emit signal to the top sensor hole of the detection unit and the bottom sensor hole, and adapted for cutting off power supply when the slide blocked the sensor hole. Because the sensor is mounted inside the detection unit and kept from sight, it is well protected against dust. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0006]    [0006]FIG. 1 is an exploded view of the preferred embodiment of the present invention.  
         [0007]    [0007]FIG. 2 is an elevational assembly view of the preferred embodiment of the present invention.  
         [0008]    [0008]FIG. 3 is an exploded view of the paper currency collection cabinet according to the present invention.  
         [0009]    [0009]FIG. 4 is an elevational view of the paper currency collection cabinet according to the present invention.  
         [0010]    [0010]FIG. 5 is an exploded view of the detection unit according to the present invention.  
         [0011]    [0011]FIG. 6 is an elevational view of the detection unit according to the present invention.  
         [0012]    [0012]FIG. 7 is a sectional view of a part of the present invention showing the top sensor hole of the detection unit aimed at the bottom sensor hole of the paper currency collection cabinet, the paper currency collection cabinet empty.  
         [0013]    [0013]FIG. 8 is similar to FIG. 7 but showing a certain amount of paper currency collected in the paper currency collection cabinet.  
         [0014]    [0014]FIG. 9 is similar to FIG. 8 but showing the full amount of collected paper currency in the paper currency collection cabinet, the slide moved away from the bottom sensor hole of the paper currency collection cabinet.  
         [0015]    [0015]FIG. 10 is an elevational view of a part of the present invention showing the relative positioning of the paper currency holding down mechanism, the slide, the pressure board, and the sensor.  
         [0016]    [0016]FIG. 11 is similar to FIG. 10 but showing a stack of paper currency retained between the paper currency holding down mechanism, the slide and the pressure board, the slide moved with the pressure board relative to the sensor. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0017]    Referring to FIGS. 1 and 2, a paper currency collection detection arrangement in accordance with the present invention is generally comprised of a paper currency receiving unit  1  adapted for receiving paper currency inserted therein, a paper currency collection cabinet  2  adapted for collecting received paper currency, and a detection unit  3  adapted for verifying the authenticity of received paper currency.  
         [0018]    The paper currency receiving unit  1  comprises a paper currency transferring mechanism (not shown), a paper currency holding down mechanism  13  (see FIGS. 10 and 11), two retaining holes  11  bilaterally disposed at the back side near the bottom, and pairs of L-shaped coupling holes  12  symmetrically disposed at the back side at different elevations above the retaining holes  11 .  
         [0019]    Referring to FIGS. 3 and 4, the paper currency collection cabinet  2  comprises a cover plate  23  detachably covered on the front open side thereof. The cover plate  23  has peripheral hooks  231  respectively hooked in respective hook holes  25  around the front open side of the paper currency collection cabinet  2 . A pressure board  21  is suspended in the paper currency collection cabinet  2 . Two spring members  22  are supported between the cover plate  23  and the pressure board  21  to force the pressure board  21  away from the cover plate  23  toward the back side of the paper currency collection cabinet  2 . The pressure board  21  has a push rod  211  protruded from one side, and two coupling portions  212  respectively coupled to the spring members, for example, spiral springs  22 . The paper currency collection cabinet  2  further comprises a plurality of coupling rods  29  symmetrically disposed at two opposite lateral sides thereof and respectively coupled to the L-shaped coupling holes  12  of the paper currency receiving unit  1 , a bottom track  25 , a slide  26  inserted into the bottom track  25 , and a bottom detection hole  28 . The slide  26  comprises a side block  261 , and two locating rods  262  bilaterally disposed near one end. Further, two small spring members  27  are respectively connected between the locating rods  262  of the slide  26  and the inside wall of the cover plate  23 .  
         [0020]    Referring to FIGS. 5 and 6, the detection unit  3  comprises a top detection hole  32  corresponding to the bottom detection hole  28  of the paper currency collection cabinet  2 , a sensor  31  formed of a transmitting circuit and a receiving circuit (not shown) disposed on the inside and aimed at the top detection hole  32 , and two retainers  33  disposed at two opposite lateral sides and adapted for engaging the retaining holes  11  of the paper currency receiving unit  1  to secure the detection unit  3  to the paper currency receiving unit  1 .  
         [0021]    During installation, the coupling rods  29  of the paper currency collection cabinet  2  are respectively coupled to the L-shaped coupling holes  12  of the paper currency receiving unit  1 , keeping the paper currency collection cabinet  2  secured to the back side of the paper currency receiving unit  1 , and then the detection unit  3  is inserted into the paper currency receiving unit  1  below the paper currency collection cabinet  2  to force the retainers  33  into engagement with the retaining holes  11  (see FIGS. 1 and 2 again).  
         [0022]    Referring to FIGS. from  7  through  11 , the transmitting circuit of the sensor  31  emits signal through the top sensor hole  32  of the detection unit  3  and the bottom sensor hole  28  of the paper currency collection cabinet  2 . When the paper currency receiving unit  1  received a piece of paper currency, the paper currency holding down mechanism  13  holds down the received piece of paper currency on the pressure board  21  against the spring members  22 . If the collected paper currency in the paper currency collection cabinet  2  is not full, the side block  261  of the slide  26  is maintained covered on the bottom sensor hole  28  of the paper currency collection cabinet  2  to reflect the signal emitted from the transmitting circuit of the sensor  31 , and the receiving circuit of the sensor  31  receives the reflected signal. Following the increasing amount of collected paper currency, the push rod  211  of the pressure board  21  is forced by the pressure from the holding down mechanism  13  to move the slide  26  forwards toward the cover plate  23  against the small spring members  27 . When the amount of collected paper currency reaches a predetermined high level, the side block  261  is moved with the slide  26  away from the bottom sensor hole  28  of the paper currency collection cabinet  2 . At this time, the receiving circuit of the sensor  31  receives no signal; thereby causing the sensor  31  to produce a signal to cut off the power circuit and to turns on an external warning lamp (not shown). In order to save the cost, a reflective photoelectric switch can be used for the sensor  31 . Because the sensor  31  is installed in the detection unit  3 , it is well protected against dust. Because only one sensor  31  is used, the cost is low. Further, because the slide  26  is supported on the small spring members  27  and moved in the track  25  following the amount of pressure from the paper currency holding down mechanism  13  of the paper currency receiving unit  1 , the detection action of the present invention is accurate.  
         [0023]    A prototype of paper currency collection detection arrangement has been constructed with the features of the annexed drawings of FIGS.  1 ˜ 11 . The paper currency collection detection arrangement functions smoothly to provide all of the features discussed earlier.  
         [0024]    Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.