US3885166A - Interlock device for auxiliary counting circuit in reproduction apparatus - Google Patents

Interlock device for auxiliary counting circuit in reproduction apparatus Download PDF

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Publication number
US3885166A
US3885166A US404785A US40478573A US3885166A US 3885166 A US3885166 A US 3885166A US 404785 A US404785 A US 404785A US 40478573 A US40478573 A US 40478573A US 3885166 A US3885166 A US 3885166A
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United States
Prior art keywords
transformer
cover
coil
transformers
coils
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Expired - Lifetime
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US404785A
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English (en)
Inventor
Hermann Moser
Walter Pils
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Hoechst AG
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Hoechst AG
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/02—Counting the number of copies; Billing

Definitions

  • each coil in the cover being located to form a transformer with a correspondingly located coil in the body of the apparatus when the cover is in the closed position over an original, whereby at least two transformers are formed.
  • the primary coil of one of the transformers is preferably located in the body of the apparatus and is connected to the signal generator, whereas the secondary coil of this same transformer is located in the cover and is connected with the primary coil, also located in the cover of the other transformer.
  • the secondary coil of this latter transformer is then located in the body and is connected to a control means which is responsive to the transmitted signal and actuates the auxiliary counting circuit.
  • the device may also include additional pairs of transformers in the foregoing sequence 13 Claims, 4 Drawing Figures AUXILIARY COUNTER ZG PATENTED HAYZU I975 SHEEI 10F 3 PATENTEB HAY 2 01975 SHEET 3 BF 3 INTERLOCK DEVICE FOR AUXILIARY COUNTING CIRCUIT IN REPRODUCTION APPARATUS BACKGROUND OF THE INVENTION
  • the present invention relates to an electrical interlock device for a circuit, and more especially to an interlock device for an auxiliary copy counting circuit in a reproduction apparatus.
  • counting mechanisms which, in the case of multiple copying of a single original, allow calculation of the copying price on a sliding scale.
  • counting mechanisms may be used which, in the case of multiple copies, count only the copies from l to 5 with a first counter and count further copies, from 6 to for example, with a second counter.
  • the simplest device of this type comprises a mechanical switch which is actuated by a cover mat for covering the original to be copied.
  • a device has been proposed in which a magnet is arranged in the cover mat and actuates a switch situated in the copying apparatus.
  • inductive approach switches have been proposed in which a metal insert in the cover initiates a switching function when it approaches a switching circuit in the apparatus.
  • the counting device can be kept in the switched-on state by the application of a permanent magnet to the correct location on the apparatus, and, in the case of an inductive approach switch, the auxiliary counter may be actuated by the application ofa metal plate. In both instances it is not necessary for the cover plate to be closed.
  • a further object of the invention resides in the provision of an interlock device for an auxiliary copy counting circuit in a reproduction apparatus which renders it virtually impossible to artificially duplicate the condition for switching on the auxiliary counting circuit when the cover is placed over an original.
  • an interlock device for an auxiliary copy-counting circuit in a reproduction apparatus having a body and a movable cover for an original to be copied, this de vice comprising an electrical signal generator.
  • each coil of each pair in the cover being located to form a transformer with a correspondingly located coil of each pair in the body when the cover is in the closed position over an original, whereby there is formed at least a first and second transformer each having a primary and secondary coil, means for coupling the primary coil of the first transformer with the signal of the signal generator, means for coupling the signal from the secondary coil of the first transformer with the primary coil of the second transformer, and control means electrically coupled with the secondary coil of the second transformer and being responsive to the signal thereof to actuate the auxiliary counting circuit.
  • the primary coil of the first transformer and the secondary coil of the second transformer are both located in the body of the apparatus.
  • An amplifier is typically introduced following the oscillator, and the control preferably comprises a receiver, for example, an amplifier in combina tion with a frequency filter, and a suitable switching mechanism, such as a relay in combination with a rectifier.
  • the control preferably comprises a receiver, for example, an amplifier in combina tion with a frequency filter, and a suitable switching mechanism, such as a relay in combination with a rectifier.
  • there may be employed one or more additional pairs of transformers between the aforementioned first and second transformers and in the case of a single additional pair, one of these additional transformers has its primary coil connected to the secondary coil of the first transformer and has its secondary coil connected with the primary coil of the second additional transformer.
  • the secondary coil of this second additional transformer is then connected to the primary coil of the aforementioned second transformer which actuates the switching mechanism which in turn actuates the auxiliary counting circuit.
  • the control preferably comprises a receiver
  • respective primary and secondary coil of the additional transformers are arranged one each in the cover and body portions of the apparatus in the same manner as with the first and second transformers.
  • a reproduction apparatus for preparing copies of an original image, including a supporting surface for the original image, a portion of which surface is scanned during the copymaking process, a cover member movably adapted to be placed over the original image, an auxiliary circuit for counting multiple copies of a single image and interlock means for actuating the auxiliary counting circuit when the cover member is in the closed position over the original image, the improvement in this apparatus comprising the use therein of an interlock device as described in the immediately foregoing paragraph.
  • one edge of the cover member is connected to the body of the apparatus, preferably in a hinged fashion, and the induction coils in the cover are positioned in the region of one of the other, non-connected edges of the cover.
  • the transformers defined by each cor responding pair of coils when the cover is in the closed position are located on opposite sides of the scanned area of the supporting surface.
  • FIG. 1 is a diagrammatic perspective view of a copy ing apparatus illustrating the support surface for the originals being copied and the cover for the support surface;
  • FIG. 2 is a block wiring diagram for an interlock device according to the invention.
  • FIG. 3 is an enlarged view of the transformers used in accordance with the invention.
  • FIG. 4 shows a further embodiment of the invention.
  • the present invention provides a copying apparatus wherein a cover for an original to be copied includes at least one pair of induction coils, the coils in each individual pair being electrically or inductively coupled together and the coils being so arranged that, when the cover is in position over the original, each coil together with a corresponding coil in the body of the apparatus forms a transformer, such that a switch-actuating se quence is completed, this sequence being such that it can be broken by removing the cover from the original.
  • the cover may include one pair of induction coils, one of which forms the secondary coil of a first transformer when the cover is in position and the other of which forms the primary coil of a second transformer.
  • the cover may include a plurality of pairs of induction coils, in which case the body of the apparatus contains an equal number of pairs of coils, the coils in each adjacent pair of coils in the body of the apparatus being electrically connected together, and the coils being so arranged that, when the cover is in the closed position, they form a series of transformers.
  • an electrical signal received at the first coil of the first trans former which first coil is preferably situated in the body of the apparatus, can pass by induction to the secondary coil of the first transformer, by conduction from that secondary coil to the primary coil of the next transformer, and so on until it reaches the secondary coil of the last transformer, which secondary coil too is preferably situated in the body of the apparatus.
  • both coils of any transformers intermediate the first and last transformers could be located solely in the cover member.
  • the auxiliary counting circuit actuating device of the invention preferably includes a generator for delivering an electrical voltage at a particular frequency, the output of the generator being electrically connected to the primary coil of the first transformer, and a receiver which is tuned to the same frequency as the generator and can close a switch on receiving a sufficiently strong signal of this frequency
  • the input of the receiver is connected to the secondary coil of the second or the last transformer, as the case may be.
  • the apparatus of the invention therefore, no longer suffers from the disadvantages mentioned above. i.e., the interlock cannot be kept in the switched-on state by any simple means when the cover is not actually closed.
  • the security device is characterized by the fact that the copying apparatus includes a generator which delivers an electrical voltage of a particular frequency, and also a receiver which is tuned to the same frequency and which switches the counting circuit on upon receiving a sufficiently strong signal at this frequency.
  • the output of the generator is connected to the primary coil of a first transformer which is arranged in the copying apparatus in the vicinity of some portion of the cover when the latter is in the closed position, and the second coil of the first transformer is so arranged in the cover that, when the cover is closed, the coil is in the vicinity of the aforementioned primary coil.
  • the primary coil of a further or second transformer is then arranged at a distance from the secondary coil of the first transformer, also in the cover, and is wired to the latter to form a closed circuit.
  • the secondary coil of the second transformer is arranged in the copying apparatus at a point which lies in the vicinity of the primary coil of this transformer when the cover is closed. and this secondary coil is connected to the input of the receiver, which is so constructed and arranged that upon receiv ing a sufficiently strong signal, the special counting de vice circuit is switched on,
  • Further pairs of transformers one coil of which is arranged in the cover in each case and the other coil in the copying apparatus, at points adjacent to the position of the associated coil when the cover is closed, may be positioned between the first and second transformers and appropriately connected to conduct the signal.
  • the interlock device In order to bypass the interlock device of the invention it is necessary to connect two induction coils with one another to form a closed electrical circuit and in each case to arrange this exactly at the point where the corresponding coils of the two transformers are arranged in the copying apparatus. This procedure requires such a great degree of knowledge and skill that it can be assumed that bypassing of this device is substantially excluded.
  • the interlock device is also simply constructed, it can be provided in any copying apparatus at no great cost, and it can easily be fitted subsequently into any existing copying apparatus. In particular, no electrical connections pass from the cover plate into the copying apparatus so that the likelihood of failures or faults occurring is extremely slight.
  • the device is also suitable for use in virtually any type of reproduction apparatus which employs a movable cover for original documents, e.g., electrostatic copies, electrophotographic copiers, photographic copies, and the like.
  • FIG. I shows part of a housing cover plate I of a copying apparatus operating, for example, on an electrophotographic basis.
  • original 3 may be placed on a transparent original support surface 2; this original can be reproduced many times in the copying apparatus (which is not shown in detail).
  • the original 3 positioned on the transparent plate 2 is covered by a cover 4 during a multiple copying operation.
  • the cover 4 may be a flexible or a rigid cover. and it has on its upper side a handle 5.
  • the cover 4 there are two flat coils 6 and 7 which are connected to one another to form a closed electrical circuit.
  • the coils are so arranged that the voltage induced in the coil 6 produces a current in the coil 7.
  • the coils 6 and 7, together with their connections, are completely embedded in the non-metallic material of the cover 4, and are in an area of the cover 4 which lies outside the area covering the glass plate 2, i.e., outside the scanned area.
  • the coil 7 represents the secondary coil of a first transformer, and the coil 6 is the primary coil of a second transformer.
  • All of the coils 6, 7, 8 and 9 are flat coils.
  • the coils 6 and 7 in the cover plate are preferably somewhat larger in diameter than the coils 8 and 9 in the apparatus in order to ensure perfect operation of the device even with slight deviations in the position of the coils arising from manufacturing.
  • Metal parts between the coils 7 and 9 and coils 6 and 8 should be avoided to the extent possible in order to avoid transfer of the alternating voltage by means of eddy currents.
  • the coil 9 forms the primary coil of the transformer l3, and the coil 8 forms the secondary coil of the transformer 12.
  • the coil 7 forms the secondary coil of the transformer 13
  • the coil 6 defines the primary coil of the transformer 12.
  • the coils 9 and 8 of the two transformers are connected to an electrical control unit which includes a generator 14 and a receiver 15.
  • the generator 14 comprises an oscillator 141 and an amplifier 142.
  • the receiver 15 comprises an amplifier 151 and a frequency filter 152.
  • a rectifier 16 and a relay 17 are connected after the frequency filter 152 and form a control element for the auxiliary counting circuit 25.
  • the relay l7 switches the auxiliary multiple copy counter 26 of the copying apparatus on or off by way of the leads l8 and 19.
  • the oscillator 141 delivers to the primary coil 9 of the first transformer 13 a voltage of a particular frequency, the voltage being amplified by means of the amplifier 142. Since the cover plate is closed, a voltage of the oscillator frequency is also produced at the secondary coil 7 of the first transformer 13. Wired together with the coil 7 is the primary coil 6 of the second transformer 12, to which the same voltage with the same frequency is therefore applied. From this primary coil 6 of the sec- 0nd transformer 12, the alternating voltage is transmitted to the secondary coil 8.
  • the coils 6 and 8 and the coils 7 and 9, respectively, are relatively close to one another in view of the fact that the cover 4 is closed.
  • the voltage induced in the secondary coil 8 is amplified by means of the amplifier 151 and is filtered by means of the frequency filter 152.
  • the frequency filter 152 is so adjusted that it allows the frequency of the oscillator 141 to pass through it.
  • the relay 17 is excited and switches on the special counting circuit 25, and hence, the counting device 26.
  • the frequency may be selected either by means of a wide band oscillating circuit or by means of selective amplifiers, for example operational amplifiers with corresponding input and feedback circuit arrangement, the details thereof being familiar to the artisan.
  • the cover 4 When the cover 4 is open, however, the following occurs: Because of the considerable distance between the primary coil 9 and the secondary coil 7 of the first transformer and the considerable distance between the primary coil 6 and the secondary coil 8 of the second transformer, the alternating voltage signal delivered by the generator 14 can no longer be transmitted from the primary coil 9 to the secondary coil 8. A sufficiently strong signal, therefore, no longer reaches the rectifier 16 by way of the amplifier 151 and the frequency filter 152. The relay 17 is thus in the non-excited state and the leads 18 and 19 are separated, so that the auxiliary counting circuit 25 is no longer switched on.
  • An oscillator is used which produces an alternating voltage of 25 kHz.
  • the signal amplified in the amplifier 142 could, when the cover is closed, be amplified in the amplifier 151, filtered in the frequency filter 152, rectified in the recitfier 16 and, after being amplified once more, could be used to trigger a relay. When the cover 4 is raised, the relay 17 no longer responds.
  • This interlock device thus makes it possible to completely exclude any simple bypassing thereof by means of metals or magnetic effects.
  • addition pairs e.g, four or six etc.
  • the secondary coil of the transformer adjacent the first transformer is wired together with the primary coil of the next transformer and the circuitry described above is repeated.
  • An example of a device with four transformers 12, 13, 20, 21 is shown in FIG. 4. The signal from the generator 14 only reaches the receiver 15 when the cover 4 is closed.
  • An interlock assembly for an auxiliary copycounting circuit in a reproduction apparatus having a body and a movable cover for an original to be copied, comprising means to generate an electrical signal, at
  • each of said transformers having a primary and secondary coil, means for coupling the primary coil of said first transformer with said signal generating means, means for coupling the secondary coil of said first transformer with the primary coil of the second transformer, and control means electrically coupled with the secondary coil of the second transformer to control an auxiliary counting circuit in response to said signal from said signal generating means being coupled through said first and second transformers, whereby said control means is disabled when the cover is opened.
  • control means comprises a means for receiving the signal from said secondary coil and switching means electrically coupled with said receiving means for actuating the auxiliary counting circuit.
  • said means for coupling the secondary coil of the first transformer with the primary coil of the second transformer comprise at least one additional pair of transformers including a third and fourth transformer each having a primary and a secondary induction coil, the primary coil of said third transformer being electrically connected to the secondary coil of said first transformer, the secondary coil of said fourth transformer being electrically connected with the primary coil of said second transformer, and means for coupling the secondary coil of said third transformer with the primary coil of said fourth transformer.
  • a redproduction apparatus for preparing copies of an original image, including a supporting surface for the original image, a portion of which surface is scanned during the copy-making process, a cover member movably adapted to be placed over the original image, an auxiliary circuit for counting multiple copies of a single image and interlock means for actuating said auxiliary counting circuit when the cover member is in the closed position over the original image, the improvement comprising said interlock means being the interlock assembly according to claim 1, with the body and the cover thereof, comprising, respectively, the supporting surface and the cover member of the apparatus.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Holders For Sensitive Materials And Originals (AREA)
  • Counters In Electrophotography And Two-Sided Copying (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
US404785A 1972-10-09 1973-10-09 Interlock device for auxiliary counting circuit in reproduction apparatus Expired - Lifetime US3885166A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2249408A DE2249408C3 (de) 1972-10-09 1972-10-09 Sicherheitseinrichtung

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US3885166A true US3885166A (en) 1975-05-20

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US404785A Expired - Lifetime US3885166A (en) 1972-10-09 1973-10-09 Interlock device for auxiliary counting circuit in reproduction apparatus

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US (1) US3885166A (de)
JP (1) JPS5641982B2 (de)
DE (1) DE2249408C3 (de)
FR (1) FR2202601A5 (de)
GB (1) GB1434630A (de)
NL (1) NL7313405A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993406A (en) * 1974-10-15 1976-11-23 Zeuthen & Aagaard A/S Electrophotographic copying apparatus
US4390267A (en) * 1982-02-22 1983-06-28 Eastman Kodak Company Bi-modal illumination apparatus
US11078687B2 (en) 2017-05-18 2021-08-03 Homady Manufacturing Company Lockable firearm safe

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54125640U (de) * 1978-02-23 1979-09-01
JP2006339044A (ja) * 2005-06-02 2006-12-14 Inax Corp 誘導コイル付き機器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967267A (en) * 1958-03-26 1961-01-03 Litton Systems Inc Reactive intercoupling of modular units
US3020473A (en) * 1959-08-06 1962-02-06 United States Steel Corp Counting apparatus
US3533691A (en) * 1966-10-22 1970-10-13 Ricoh Kk Electrophotographic duplicator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967267A (en) * 1958-03-26 1961-01-03 Litton Systems Inc Reactive intercoupling of modular units
US3020473A (en) * 1959-08-06 1962-02-06 United States Steel Corp Counting apparatus
US3533691A (en) * 1966-10-22 1970-10-13 Ricoh Kk Electrophotographic duplicator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3993406A (en) * 1974-10-15 1976-11-23 Zeuthen & Aagaard A/S Electrophotographic copying apparatus
US4390267A (en) * 1982-02-22 1983-06-28 Eastman Kodak Company Bi-modal illumination apparatus
US11078687B2 (en) 2017-05-18 2021-08-03 Homady Manufacturing Company Lockable firearm safe

Also Published As

Publication number Publication date
DE2249408B2 (de) 1975-01-09
AU6117373A (en) 1975-04-10
JPS5641982B2 (de) 1981-10-01
NL7313405A (de) 1974-04-11
JPS4974544A (de) 1974-07-18
GB1434630A (en) 1976-05-05
DE2249408C3 (de) 1975-11-06
FR2202601A5 (de) 1974-05-03
DE2249408A1 (de) 1974-05-02

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