EP0362761A2 - Dispositif électromécanique à marche intermittente, en particulier pour les coupeuses photographiques - Google Patents

Dispositif électromécanique à marche intermittente, en particulier pour les coupeuses photographiques Download PDF

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Publication number
EP0362761A2
EP0362761A2 EP89118221A EP89118221A EP0362761A2 EP 0362761 A2 EP0362761 A2 EP 0362761A2 EP 89118221 A EP89118221 A EP 89118221A EP 89118221 A EP89118221 A EP 89118221A EP 0362761 A2 EP0362761 A2 EP 0362761A2
Authority
EP
European Patent Office
Prior art keywords
motor
frame
rotor winding
cam
feed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89118221A
Other languages
German (de)
English (en)
Other versions
EP0362761A3 (fr
Inventor
Roberto Signoretto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Systel International SpA
Original Assignee
Systel International SpA
Photo Engineering International SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Systel International SpA, Photo Engineering International SRL filed Critical Systel International SpA
Publication of EP0362761A2 publication Critical patent/EP0362761A2/fr
Publication of EP0362761A3 publication Critical patent/EP0362761A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D15/00—Apparatus for treating processed material
    • G03D15/04—Cutting; Splicing
    • G03D15/043—Cutting or splicing of filmstrips
    • G03D15/046—Automatic cutting

Definitions

  • This invention relates to an electromechanical intermittent operation device, particularly for photographic cutters.
  • Known mechanism for operating the cutter mobile blade generally comprise a continuously rotating electric motor, a cam member which converts the rotary motion of the motor into reciprocating motion of the mobile lever, and a mechanical and/or electromagnetic clutch which periodically engages the cam member with the motor and disengages it when the motor shaft has undergone one revolution.
  • a braking system is also provided to brake the cam member at the moment of their disengagement in order to keep the mobile cutter blade separated from the fixed blade while awaiting repetition of the cycle, to allow the paper strip to further advance between one cutter operation and the next.
  • a further drawback is the fact that notwithstanding such high stresses, a performance of 20.000 cycles/hour is not considered exceptional, even though a rate of 25.000 cycles/hour is currently considered a limit which can only be exceeded with difficulty.
  • a further drawback is that even though the absorbed power is low, the energy required to keep the electric motor continuously rotating and to brake the mobile parts after each cycle is certainly not negligibile.
  • stepping motors have to be powered during their halt periods, which means that some energy is required even to maintain rest conditions.
  • stepping motors require a sophisticated information system for signalling their position in the case of power interruption, in order to enable them to be returned to their initial waiting position on restoration of power.
  • an electromechanical intermittent operation device particularly for photographic cutters, characterised by comprising: - a direct current motor, the shaft of which is directly coupled to a cam for controlling the member which is to be intermittently operated, - a member to be intermittently operated, provided with elastic means which, in the absence of other external forces, maintain it in its waiting condition, - means for cyclically feeding the electric motor with an overcurrent for a time sufficient to cause it to pass beyond the half-way stage in the operating cycle and then interrupting the electrical feed, - means for short-circuiting the rotor winding on interruption of the electrical feed, and - means for feeding the rotor winding with a countercurrent pulse of such a duration as to halt the motor without oscillation exactly in its waiting position.
  • the device according to the invention is applied to a conventional photographic cutter comprising a frame 1 to which a support 2 is applied for a pair of fixed blades 3 disposed parallel to each other and transversely to a track 4 along which a continuos strip (not shown on the drawings) to be cut into individual photographs advances.
  • the frame 6 comprises a lower cross-member 8 which receives the movement, and an upper cross-member 9 wich supports both the mobile blade 7 and the two columns 5 which connect the two cross-member 8 and 9 together.
  • Ball guides 10 are interposed between the bores through the support 2 and the columns 5 to produce very smooth axial sliding of these columns, and a helical spring 11 operating by expansion is interposed, about each column 5, between the support 2 and the upper cross-member 9.
  • a disc 18 from which a circular rim sector 19 has been removed is also fixed on the motor shaft 16.
  • a reflection sensor 20 is fixed to a support 21 rigid with the machine frame 1, in a position facing the circular rim of the disc 18 from which the sector 19 has been removed.
  • the output of the sensor 20 is connected to an electronic circuit 22 which is connected into the power circuit of the motor 17 for the purpose stated in the following description of operation of the device.
  • the position of the motor shaft 16 is such that the support frame 6 for the mobile blade 7 is at the top of its upward stroke and the motor 17 is not powered, the stability of this position being ensured by the springs 11.
  • the circuit 22 causes the electric motor 17 to fed with a higher current than the maximum allowable for the motor, this however not resulting in any damage or overheating because of the essential pulse nature of this current and the relatively long pause time between one cycle and the next.
  • the motor 17 rotates to lower the mobile blade 7 relative to the fixed blade, with consequent cutting of the paper strip.
  • the missing sector 19 of the disc 18 faces the sensor 20, which is therefore de-energized to cause the circuit 22 to interrupt power producing a braking effect on the motor and on the mobile parts connected to it.
  • the angular width of the sector 19, which correpsonds to the braking time is determined experimentally and is fixed, whereas the duration of the countercurrent pulse is adjusted when setting up the cutter, after which it remains fixed but can be varied.
  • the purpose of the springs is not only, as stated, to maintain the rest position without the need to provide energy, but also to enable said rest position to be automatically attained, again without the need to provide energy, after an accidental interruption in the power supply or any stoppage of the device outside its rest position.
  • the device offers numerous advantages compared with conventional devices of equal cost, and in particular: - there is no rapid engagement-disengagement between parts running at different speeds, and therefore a lack of overall noise and a reduction in the considerable stresses which formerly limited overall reliability, - its construction is very simple and practically no maintenance is required, - a high operating rate of the order of 30,000 cycles/hour can be attained, - energy consumption is low.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Cutting Processes (AREA)
EP19890118221 1988-10-05 1989-10-02 Dispositif électromécanique à marche intermittente, en particulier pour les coupeuses photographiques Withdrawn EP0362761A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8884138A IT1226000B (it) 1988-10-05 1988-10-05 Dispositivo elettromeccanico di azionamento intermittente, particolarmente per taglierine fotografiche
IT8413888 1988-10-05

Publications (2)

Publication Number Publication Date
EP0362761A2 true EP0362761A2 (fr) 1990-04-11
EP0362761A3 EP0362761A3 (fr) 1991-11-21

Family

ID=11324623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890118221 Withdrawn EP0362761A3 (fr) 1988-10-05 1989-10-02 Dispositif électromécanique à marche intermittente, en particulier pour les coupeuses photographiques

Country Status (2)

Country Link
EP (1) EP0362761A3 (fr)
IT (1) IT1226000B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506292A1 (de) * 1995-02-23 1996-08-29 Kiene Christel Gerät zum Ausstanzen von Lichtbildern

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2652521A1 (de) * 1976-11-18 1978-05-24 Kaltenbach & Voigt Schaltung zum abbremsen eines mit gleichspannung betriebenen reihenschlussmotors
US4354147A (en) * 1980-08-15 1982-10-12 Klaussner Hans Jurgen Drive and control arrangement for a mechanical eccentric press
JPS58143996A (ja) * 1982-02-17 1983-08-26 富士写真フイルム株式会社 カツタ−装置
DE8703368U1 (de) * 1986-03-12 1987-04-30 Bielomatik Leuze Gmbh + Co, 7442 Neuffen Querschneider für Bahnmaterialien

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19506292A1 (de) * 1995-02-23 1996-08-29 Kiene Christel Gerät zum Ausstanzen von Lichtbildern

Also Published As

Publication number Publication date
IT1226000B (it) 1990-12-10
EP0362761A3 (fr) 1991-11-21
IT8884138A0 (it) 1988-10-05

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