US 3652834 A
A sheet counter in which sheets such as bills are inserted in a openable holder, and wherein a counting operation is started by depressing a designated button, and upon completion of counting the number of sheets a comparison between a counter value on a counter display and a set pre-value is made, and depending upon the comparison, opening and closing operation of the holder are controlled, thereby to actuate the lamp display, whereafter the counter display is reset; and further the resetting circuit and the vacuum pump operating circuit for said sheet counter are described.
Claims available in
Description (OCR text may contain errors)
United States Patent Shigemori et al.
SHEET COUNTER Inventors: Hideto Shigemori; Akio Yamamoto, both of Tokyo-to, Japan Assignees: Kabushiki Kaisha Kokuel Klkal Seisankusho, l-limeji-shi, Hyogo-ken; Glory Kogyo Kabushiki Keisha, Tokyo-to, Japan Filed: June 23, 1970 Appl. No.: 49,022
Foreign Application Priority Data June 30, 1969 Japan ..44/6l241  References Cited UNITED STATES PATENTS 2,912,242 11/ 1959 Richardson ..271/27 2,530,057 11/1950 Hayes 2,635,811 4/1953 Hayes ..235/92SB Priniary Examiner-Maynard R. Wilbur Assistant Examiner-Joseph M, Thesz, Jr. Attorney--Holman & Stern  ABSTRACT A sheet counter'in which sheets such as bills are inserted in a openable holder, and wherein a counting operation is started June 1969 Japan by depressing a designated button, and upon completion of June 1969 Japan counting the number of sheets a comparison between a June 1969 counter value on a counter display and a set pre-value is made, July 18, 1969 Japan ..44/56913 and depending p the comparison, p g and closing operation of the holder are controlled, thereby to actuate the "235/92 235/98 271/27 lamp display, whereafter the counter display is reset; and Int. Cl. ..G06m 9/00 further the resetting circuit and the vacuum pump operating Field of Search .235/92 SB, 92 PK, 92 PE, 92 J, circuit Said sheet come, are descflbm 5 Claims, 12 Drawing Figures W12 3V RL4 RL'Fol *1 RL3-oi RL2-q VS RLS-gj/ MC5 a /RLI-c2 PATENTEDmze I972 SHEET 1 OF 6 PATENTEnMAm I972 SHEET 3 OF 6 PATENTl-jnmza m2 SHEET 5 OF 6 IFIG'.8
PATENTEDMAR28 I972 SHEET 8 OF 6 FIG.9
snEE'r COUNTER BACKGROUND OF THE INVENTION Hithereto, counters which count the number of sheets such as in a stack of bills by absorbing them one by one have been proposed. However, they are liable to make errors in counting the number of sheets, and are complicated in operation, and further always necessitate an operation to compare a counted value with a set value. Therefore, they are disadvantageous in confirming the result of the counting operation. Moreover, in case that the sheet counter of this type is used by connecting said counter to a power source, a random counter display is made on a counter tube upon connection of said power source to the counter. This will let an operator thereof have an illusion that the sheet counter is out of order or is operated in error, and further, the operator must depress a resetting button, with the result that the conventional sheet counters are extremely inconvenient. Furthermore, in resetting the counter, unless the resetting operation is accomplished so that the counter is reset after elapse of a sufficient resetting time after the application of a power source, the next counting operation conducted before the resetting operation may be erroneous. Hitherto, there exists a system utilizing relay means only so that the resetting operation is started at the same time as the power source is applied. However, this system has a defective point in that it is impossible to exactly set adequate delay time of the relay, thereby causing incomplete resetting of its counter circuit.
In addition, in a conventional vacuum type bill counter, its vacuum pump is started by depressing a starting button thereof, and a required counting operation is accomplished by stopping the operation of the vacuum pump upon completion of counting the number of bills. Therefore, frequency of the starting and stopping operations of the vacuum pump is necessarily increased, and in one countera large current such as 8A in its transient period compared to A in its steady-state period flows. Accordingly, the counter of this type has disadvantages and defects in that the contacts for starting and stopping the counter are excessively worn out thereby causing shortening of the life of the contact terminals and producing transient signals which become a large noise source in opening and closing the contacts.
SUMMARY OF THE INVENTION Therefore, an essential object of the present invention is to provide a sheet counter which is accurate in counting operation, high in dependability and simple in operation, and in which a number of sheets are inserted in a holder, the counting operation is accurately started by depressing only a designated button, comparison between a counted value and a set value is accomplished upon completion of counting the number of sheets, depending upon the comparison result the opening and closing operation of the sheet holder is controlled, lamp display is made, whereafter the counter display is reset.
Another object of the present invention is to provide a sheet counter having an automatic resetting of a simple circuit type including capacitors, resistors, and diodes, in which one resetting pulse is generated upon application of a power source, and by said resetting pulse the whole flip-flop circuit of the counter is reset.
A further object of the present invention is to provide a sheet counter having a resetting circuit, in which a counter display thereof is automatically reset to zero state upon application of a power source thereto and the necessary resetting time of the counter circuit is obtained with accuracy.
stopping a vacuum pump provided for the counter is provided,-
and unfavorable spark of the contacts operated by said relay means is decreased.
According to the invention, the above-mentioned objects have been effectively attained by providing, in combination, an operating circuit including a motor for opening and closing a sheet holder, a vacuum pump adapted to adsorb a sheet in said holder, detecting switch means for controlling starting and stopping operations of said vacuum pump thereby to detect a designated degree of vacuum, a pulse shaping circuit for shaping pulses from said detecting switch means, a counter circuit for counting said pulses fromsaid pulse shaping circuit only when said designated vacuum degree is established, a comparison circuit for comparing a counted value with a set value only when a counting operation is completed, and a resetting circuit for resetting said counter circuit. The foregoing objects and other objects as well as the characteristic features and functions of the invention will become more apparent and more readily understandable by the following description in connection with the accompanying drawings, in which the same or equivalent members are designated by the same reference characters.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is an operation control circuit diagram for a sheet counter according to the present invention;
FIG. 2 is a circuit diagram for the counter display circuit part of a counter according to the present invention;
FIG. 3 is a circuit diagram showing one embodiment of a resetting circuit of a counter according to the present invention;
FIG. 4 is a circuit diagram showing one embodiment of an automatic resetting circuit according to the present invention;
FIG. 5 is a schematic circuit diagram showing one embodiment of a counter circuit according to the present invention;
FIG. 6 is a circuit diagram showing one embodiment of a resetting circuit of the present invention;
FIG. 7 is a circuit diagram showing a part of the counter circuit of one embodiment of the present invention;
FIG. 8 is a circuit diagram showing a part of the counter operating circuit of a. second embodiment of the present invention;
FIG. 9 is a comparison circuit diagram of the counter shown in FIG. 8;
FIG. 10 is a reset-button circuit of the counter shown in FIG. 8;
FIG. 11 is a circuit diagram showing a part of the counter circuit of the counter shown in FIG. 8; and
FIG. 12 is a vacuum pump operating circuit of a sheet counter according to the present invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Referring to the drawings, the present invention is explained in detail as follows:
With reference now to FIGS. 1 and 2; a power source push button PB and a push button P8,, are designed so as to be cooperated, so that when the pushbutton P8 is depressed, the push button PB also is operated; therefore a current flows through line l holder motor M1 (which operates,
.through cam means, to turn alternately a holder toward its open direction and close direction adapted to hold a sheet) microswitch MC,- contact RLS-b contact RLl-Cl A still further object of the present invention is to provide a M sheet counter which is extremely simple in operation and has a resetting circuit, in which by depressing a resetting button thereof the counter is reset and also the sheet holder is opened so as to loosen tightened sheets.
microswitches MCI, MC2 and MC3 which are interlocked by means of cam means with the shaft of the motor M1 are switched over from the positions shown in figure and said current passage is opened at said microswitch MCl thereby to stop the motor Ml. Therefore, the holder is left in an open A furthermore object of the present invention is to provide a a sheet counter, in which a relay means for starting and position. Next, when a number of bills to be counted are inserted in the holder and then a starting button PB2 is depressed, a current flows through relays RLl and RL2 the energization of the relays RH. and RL2, and then a current flows through I, motor Ml PB contact RLZ-Cl contact MC line I thereby to rotate the holder motor M1, whereby the holder is turned in a direction opposite to the previous turning direction thereby to close the holder. In this state, the relay RLl and RL2 are energized through the contacts RLl C1 and RL4-C1 even if the push button P82 is opened. n the other hand, upon closing of the contact RLl C2, a relay RLS for a pump operation is energized, whereby contact RLS-al is closed and a vacuum pump VP is operated to increase a vacuum degree thereof. When a sufficient vacuum degree is established, a vacuum switch VS is switched over from the state shown in the figure thereby to energize a power relay RL4. By this energization, a contact RL4-Cl is switched over so as to energize a relay RLS thereby to close a contact RLS-al, whereby a current flows through winding of a motor M2 contact RL2-a1 closed previously by the relay RL2 contact RLS-al contact RL4-Cl thereby to revolve the motor M2. When the relay R144 is energized, its another contact RL4-a1 (FIG. 2) is closed, thereby to apply an output pulse from a pulse-shaping circuit RS to a counter circuit CA1. The pulse-shaping circuit RS converts pulses introduced therein from a proximity switch NS to suecessively shaped pulses, said switch NS detecting the passage of magnetic members secured around a rotor (not shown) and number of which corresponds to the number of vacuum heads. The thus converted shaped pulses are successively fed to an output terminal To thereby to let counter circuits CA1 through CA3 continue the counting operations thereof. In this case, instead of said proximity switch, a microswitch which mechanically detects the revolution of the rotor may be utilized.
After the number of bills is counted up, the vacuum degree is abruptly decreased. Therefore, the vacuum switch VS is switched over to the state shown in the figure and relay RL4 is de-energized thereby to switch contact RL4-Cl thereof over to the state shown in the figure. Thus, the current flowing to the motor M2 is ceased thereby to stop the motor M2. As a result, the contact RL4-a1 (FIG. 2) is opened and so no output pulse arrives to the output terminal To of the pulse shaping circuit RS. Therefore, the counter circuits CA1 through CA3 do not work any longer, and counter errors caused by the idle revolution of the rotor are completely eliminated.
In FIG. 2, ND represents a counter display means such as a counter tube for constantly displaying counted values obtained by the counter circuits CA1 through CA3, by which a counted value of the bills can be read upon completion of counting number of the bills.
A sheet counter according to the present invention is designed so as to open or close the holder thereof depending upon whether or not a counted value agrees with a set value when the counting operation is completed. In addition, a known value is set so that its lowest place and next higher place both are 0," and said set value is compared with a counted value. I-lD in FIG. 2 represents a comparison circuit used to compare the counted value with the set value, and 0 counter output terminals of the counter circuits CA1 and CA2 are connected to input terminals T1 and T2, respectively. The counter outputs 0 9 of each counter circuit will produce a voltage output of low level at output terminals corresponding to said counted value. Now, let it be assumed that a counted value of the counter circuit CA1 is 9 and a set value of the counter circuit CA2 is not 9, the voltages applied to the terminals T1 and T2 become high in level, all the transistors Tr through Tr of the comparison circuit I-lD become conductive and also relay RL7 becomes actuated. Therefore; a contact RL7-a1 of FIG. 1 is closed, and a current flows through check button PB3 relay RL3 contact RL7-a1 contact RL4-Cl, thereby to energize relay RL3. In addition, the check-button P83 is of a locking type, and, usually, is
depressed at a proper time after the starting button P82 is depressed. When the relay RL3 is energized, its contact RL3-bl is opened thereby to interrupt the revolving circuit of the holder motor Ml, therefore the holder motor M1 does not operate and the holder is maintained at its closed state. Accordingly, the previously held bills are left tightened in the holder when the counting operation is finished, therefore and operator cannot remove the bills and so can surely confirm that the counted value is not coincident with the set value. Moreover, since a contact RLS-al is closed at the same time as the relay RL3 is energized, the pilot lamp FL is lit on. This will also indicate to the operator that the counted value is not coincident with the set value.
When the counted value coincides with the set value, voltages applied to the terminals T1 and T2 of the comparison circuit l-ID are both low in their level; therefore the transistor Tr, in the final stage of said comparison circuit BB is not conductive. Accordingly, the relay RL7 is not energized; therefore the pilot lamp PL is not lit, and the holder is not closed. In other words, the holder is opened, so that the operator can remove said bills and then insert a fresh stack of bills to be counted next into the holder.
In addition, as shown in FIG. 2; there is provided a contact RL4-bl operated by operation of the relay RL4 and designed so that the comparison circuit controls the holder operating circuit only when the counting operation is completed. That is, since the relay RL4 is kept energized during the counting operation, the contact RL4-bl is opened during said counting operation; and thereafter the above-mentioned action is conducted only when the counting operation is completed.
FIG. 3 shows a resetting circuit comprising a resetting button P84 and a relay RL6. When the resetting button P84 is depressed, the relay RL6 is de-energized thereby to close contacts RL6-bl RL6-b3 connected to the resetting terminals of the counter circuits CA1 to CA3. Accordingly, all the counter circuits CA1 to CA3 are reset and all the display digital numbers of the counter display means show 0," and at the same time the holder is opened as described already.
When a display at random is indicated onthe counter display means in firstly using the sheet counter and a counting operation is started by depressing the starting button PB2, contact RL2-al is connected to each resetting terminal of the counter circuits CA1 to CA3 so that a totalization is not made on counter display. In other words, when the starting button PB2 is depressed to energize the relay RL2, the contact RL2-al is closed and each counter circuit is reset.
Referring to FIG. 4; the circuit comprises terminals T14 and T24 to which a voltage of +6 v. and a voltage of l4 v. are respectively applied upon application of a power source, a capacitor C4, a resistor R14, a diode D4, resistors R24 and R34, and an output terminal T34 which is connected to resetting terminal P5 of the flip-flop circuit F5 in a counter circuit CAshown in FIG. 5.
Now, when a power source is applied to the sheet counter, a charge current of the capacitor C4 flows instantaneously through the capacitor C4 and the resistor R14 from the terminal T14, thereby generating a pulse having a positive-polarity at point connecting the diode D4 with the resistor R14. This pulse is fed to the output terminal T34 through the diode D4, and is applied to the resetting terminal P5 of the flip-flop circuit F5 of the counter circuit CA. Therefore, a diode D15 connected to the terminal P5 is temporarily cutoff, and as a result all parts of said flip-flop circuit are reset. Only one flip-flop circuit of the counter circuit CA is shown herein, but said pulse is applied to the resetting terminals of all flip-flop circuits provided in the counter circuits CA1, CA2 and CA3. Accordingly, all the counter circuits are reset to 0, and also the display of the counter tubes is reset to 0.
The afore-mentioned pulse is generated at a moment only when the power source is applied, and the potential at the point connecting the resistor R14 and the capacity C4 becomes 0" after charging of the capacitor C4 has been completed. Therefore, any pulse is not generated through the diode D4, and thereafter the normal counting operation of the counter circuit can be carried out.
In FIG. 6; the circuit comprises a resetting button P826, a power switch PB16, a relay RL6, a resistor R6, and a capacitor C6. The circuit of FIG. 7 shows a counter circuit CA comprising a flip-flop circuit F5, diodes D17, D27, and Dn7, and a contact RL-b7 operated by the relay RL6.
Now, let it be assumed that the power source is ofi under the condition that the counter display of the bill counter is not reset; then upon application of the power source a charge current flows to the capacitor C6 through the resistor R6, but potential across both ends of the capacitor C6 does not reach the operational potential of the relay RL6, therefore said relay RL6 does not operate and the contact Rlz-b7 thereof is in open state. Accordingly, each flip-flop circuit of the counter circuit returns to 0, because said flip-flop circuit is in grounded state through the diodes D17 Dn7 and contact RL-b7. The time until the relay RL6 starts its operation can be set by a time constant determined by the resistor R6 and the capacitor C6, for instance, to 50 ms. In other words, this is a time interval until the counter circuit sufficiently completes the resetting operation thereof, and is determined with accuracy by the values of the capacitor C6 and resistor R6.
When a voltage across both ends of the capacitor C6 increases to the operating voltage of the relay RL6, the RL6 operates thereby to open its contact RL-b7, and the counter circuit comes into a normal pre-operational condition.
In FIG. 8 is illustrated, a part of the operating circuit of the sheet counter of the invention. The circuit shown in FIG. 8 comprises a holder motor M18 corresponding to M1 in FIG. 1 and various circuit elements which are described below in connection with operation of the circuit. When'a power button PB1A8 is depressed, a contact PB1B8 coupled with 'said button is switched over in an interlocking way, and a current flows through line [18 M18 PBlB8 microswitch MC18 relay contact RL3-b8 RL1S8 contact RLS-SS line I28, thereby revolving the holder motor M18 and opening a holder (not shown). Upon opening of the holder to a designated opening degree, the microswitch MC18 interlocked with the shaft of the motor M18 by means of a cam is actuated and said current is interrupted, thus retaining the holder at its designated opening state. Next, when a number of bills to be counted is inserted in this holder and a starting button PB28 is depressed, a current flows through line I18 relays RL18 and RL28 PB28 microswitch MC18 microswitch MC38 line I28, whereby contact RL2-a8 is switched over from the position shown in the figure by energization of the relay RL 28, so that a current flows through line I18- motor M18 PB1B8 contact RLZ-a8 contact RLS-b8 contact RLl-S8 contact RL5-S8 line I28, thereby to revolve further the holder motor M18. Thus, the holder is driven in a direction opposite to the previous direction and is closed as explained in detail in connection with the circuit in FIG. 1.
The start button P318 is of a non-locking type. Thereafter, the contact (not shown) of the relay RL18 is closed by energization of said relay RL18 thereby revolving a vacuum pump (not shown), and when the vacuum therein reaches a designated value, a motor (not shown) is actuated and the counting operation of the number of bills is carried out. However, the detailed explanation as to these operations is omitted here as the same has been disclosed in detail in connection with the circuits shown in FIGS. 1 and 2.
Usually, a check-button PB38 is depressed at a designated time after the start button PB28 has been depressed. The button PB38 is of a locking type and is to automatically open or close the holder depending upon whether or not a counted value of bills agrees with a set value.
In the counting operation of a vacuum type bill counter, as well known, a rotor equipped with several heads directly contacting the bills is revolved and a vacuum is applied to each head; therefore, by utilizing the fact that sufiicient vacuum exists during the period of time when each head successively bills with the rotation of each head, a plurality of magnetic members secured on the lower partof the rotor and passing successively, number of said members corresponding to the number of heads, is detected by means of a proximity switch. Pulses from the proximity switch are counted by bringing them to a counter circuit so as to obtain a counter display thereof. A plurality of flip-flop circuits FF 11 are provided in the counter circuit, but only one flip-flop circuit FFll is shown in FIG. 11 as the counter circuit itself is well known. The counter circuit is further provided with a decimal counter part besides the flip-flop circuits. Since the counter display tube corresponds to three figures, a counter part corresponding to three figures is provided.
The bill counter according to the present invention is designed so as to check the lower first and second figureplaces of a counter display, and 0 output of a counter circuit corresponding to the lower first figure-place and 0 output of a counter circuit corresponding to the lower second figure-place are applied to terminals T19 and T29 of a comparison circuit of FIG. 9. In other words, in case the lower two figure-place displays of a counter display tube are 00 upon completion of counting, the holder is opened so as to make provision for a stack of bills to be counted next to be inserted; and in case either of the lower two figure-place displays is not 0, the holder is not opened, and is kept closed. In other words, since both signals applied to the terminals T19 and T29 are low in potential level when the lower two figure-place displays are 00, transistors Tr19 Tr49 are not conductive and also a relay RL49 does not operate. Accordingly, a contact RL4-a9 is left open, and a current flows through line I18 PB1B9 MC18 contact RL3-b8 contact RLlS8' RL5-S8 line I28, thus actuating a holder motor M18 and opening the holder. On the contrary, in case that the lower two figure-place displays are not 00," one or both of the signals applied to the terminals T19 and T29 are high in potential level, so that the relay RL49 is energized and its contact RL4-a8 is closed, thereby energizing a relay RL38 (FIG. 8) and opening a contact RL3-b8 (FIG. 8). Accordingly, current through the holder motor M18 as stated above does not flow and the holder is left closed. In addition, a contact RL5S8 (FIG. 8) is switched over by means of a relay (not shown) which is energized at the operating time of a vacuum switch (not shown). That is, the contact RL5-S8 is switched over to the position opposite to the position shown in the figure during a bill-counting operation, and said contact RL5-S8 will be positioned at the place shown in the figure when the billcounting operation is not carried out.
In the embodiment shown in FIGS. 8, 9 and 11, after completion of the bill counting, a counter circuit is reset by depressing a resetting button when a counted value is not coincident with a set value, whereby all counter tubes are reset to be 0 and the holder is opened at the same time.
FIG. 10 shows particularly a resetting circuit adapted to be used in the counter shown in FIGS. 8, 9 and 11, in which P8410 is a resetting button, R is a resistor, RL610 is a relay, and C10 is a capacitor.
When the number of bills has been counted, the contact RL5-b9 is closed while the contact RL6-all is opened. The contact RLS-b9 is of b type of the relay RLS as mentioned in connection with FIG. 1, and is opened while the number of bills is being counted and is closed while the number of bills is not counted. Referring now to FIGS. 8, 9, 10 and 11, when a resetting button PB 410 is depressed after it is confirmed that the displays on counter tubes are not coincident with a set value when the number of bills has been counted up (at this time the holder is left closed and the bill absorption is observed), a relay RL610 is immediately de-energized; therefore the contact RL6-211 is closed. As a result of this, all flip-flop circuits of the counter circuit are reset, and therefore 0 outputs for the lower first figure-place and lower second figureplace are applied respectively to the terminals T19 and T29 of the comparison circuit. Therefore, all transistors Tr19 Tr49 which have been conductive, becomes non-conductive, and
the relay RL49 is de-energized. Accordingly, the contact RL4-a8 is opened, the relay RL38 is de-energized and the contact RL3-b8 is closed. As a result of this, a current flows through line 118 motor M18 PBIBS MCl8 contact RL3-b8 ELI-S8 EL-S8 line [28, whereby the motor M18 is rotated, and the holder is opened. When the holder is opened to be a designated opening degree, the microswitch MC18 is mechanically switched off, thus stopping the motor M18.
FIG. 12 shows a particular part extracted from the operating circuit of the bill counter according to the invention. The circuit of FIG. 12 comprises a vacuum pump VP, a relay C12 for operating said pump, a contact (b) which is closed when a starting button (not shown) is depressed, a contact (a) of a vacuum pump switch, said contact (a) being switched over to A-side when said vacuum pump switch is switched over, and relay contacts C121 and C122 which are switched by energization of said relay C12.
When the contact (b) is closed, the pump-operating relay C12 is energized and the relay contacts C121 and C122 are closed, thus causing operation of the vacuum pump VP. As a result, when a vacuum pressure reaches a designated value, the vacuum pump switch is switched over to A-side, and at the same time the contact (b) is opened, whereby the energization of the relay C12 may be interrupted momentarily, but the relay is continuously energized by the holding action of the relay C12 through the contact (a). When the number of bills is counted up, the vacuum pump switch is switched over to the side opposite to A-side, and the relay C12 is de-energized. Accordingly, the relay contacts C112 and C122 are opened, and the vacuum pump VP is stopped. In this case, it is to reduce sparks by providing two contacts that two relay contacts C112 and C122 are provided in series with the power source circuit of the vacuum pump. That is, as the absolute quantity of a spark caused at a time is same and said absolute quantity is equally divided by the number of contacts, spark caused at each contact becomes less, proportionally to the number of contacts.
1. A sheet counter which comprises: a sheet holder for holding a stack of sheets to be counted; motor means adapted for actuating said sheet holder to release the sheets held in the sheet holder and including a vacuum pump arrangement adapted to adsorb sheets from said holder; a detecting switch means associated with said motor and sheet holder and giving out pulses for controlling starting and stopping operations of said vacuum pump by detecting a predetermined degree of vacuum in the pump; a pulse shaping circuit for shaping pulses from said detecting switch means; a counter circuit means connected to said pulse shaping circuit for counting and display of the count of said pulses from the pulse shaping circuit only when said predetermined degree of vacuum is established and sheets in the sheet holder are absorbed and counted, said counter circuit means comprising flip-flop circuits and means for setting a predetermined count-value; a comparison circuit connected to the counter circuit means for comparing a counted value with a set value only when a counting operation is completed; and a resetting circuit means for resetting said counter circuit, including means whereby said sheet holder is caused to open from its closed state, the resetting circuit means characterized in that it is adapted to deliver a resetting signal when a power source is applied to the counter circuit.
2. A sheet counter as claimed in claim 1, in which said resetting circuit means comprises a capacitor and a resistor which produce positive-polarity pulses, a diode whose anode side is connected to said resistor, a bias circuit imparting a negative bias to the cathode side of said diode, and a resetting pulse leading means adapted to pick up and send out resetting pulses from the cathode side of said diode when a power source is applied to the counter circuit.
3. A sheet counter as claimed in claim 1, in which said resetting circuit means comprises a switch button; a resistor and a relay connected in series with said resettin switch button; a capacitor connected in parallel with said re ay; and a b type contact provided in said relay, said contact being connected commonly with the resetting circuits of all flip-flop circuits of the counter circuit means.
4. A sheet counter which comprises: an operating circuit including a motor for opening and closing a sheet holder; a vacuum pump adapted to adsorb successively sheets from said holder; a detecting switch means associated with said motor and sheet holder, for controlling starting and stopping operations of said vacuum pump thereby to detect a designated vacuum degree thereof; a pulse shaping circuit for shaping pulses from said detecting switch means; a counter circuit counting and displaying the count of said pulses from said pulse shaping circuit only when said designated vacuum degree is established; a comparison circuit for comparing a counted value with a set value only when a counting operation is completed; and a resetting circuit for resetting said counter circuit, said counter circuit comprising flip-flop circuits and said resetting circuit comprising a resetting button for resetting all of said flip-flop circuits when said button is depressed thereby to carry out counting display, a relay coil provided at output side of said comparison circuit so as to be de-energized when resetting operation of said resetting circuit is induced, a check button circuit including a check button and a contact operated by said relay coil so as to be opened when said relay is de-energized, another relay coil connected in series with said check button through said contact of said former relay coil so as to be de-energized by opening of said contact, a holder driving circuit including a holder motor and a relay contact inserted in holder driving circuit and adapted to be closed by de-energization of said another relay coil thereby to open said holder.
5. A sheet counter as claimed in claim 1, in which the vacuum pump comprises an operating relay means for said vacuum pump including several relay contacts which are connected in series in a power source circuit of said vacuum pump.