Information retrieval apparatus
阅读：640发布：2023-09-11
专利汇可以提供Information retrieval apparatus专利检索，专利查询，专利分析的服务。并且Information retrieval apparatus, particularly for locating a desired frame on a microfilm strip, comprises a photo-electric transducer for detecting the passage therepast of markers on the film strip, each marker being associated with a particular frame, a counter for counting the corresponding signals produced by the transducer, storage means for storing the serial number of a frame to be brought to a reading position, comparing means for continually comparing the count of the counter with the stored serial number, and means for arresting the film movement when the comparison shows equality. The apparatus includes means for slowing the film at a predetermined number of markers before the marker corresponding to a selected frame and means for varying the predetermined number in accordance with the size of the frames on the film strip being used. The apparatus also includes means for selecting from the transducer output a signal representative of the leading edge of the marker, according to the direction of motion of the film, and means operative to halt the film with the transducer located midway between the ends of the selected marker.，下面是Information retrieval apparatus专利的具体信息内容。
1. In apparatus having a transport mechanism for driving, along a predetermined path, a longitudinally movable recording medium having a plurality of longitudinally arranged areas in which information can be recorded and a respective marker associated with each area, and transducer means arranged to produce a respective electrical signal in response to the movement of each marker therepast, each electrical signal comprising first and second time-displaced portions respectively produced by longitudinally-spaced regions of each marker, a control system comprising storage means operative to store an identifying number identifying a particular desired marker which is to be positioned, by appropriate movement of the recording medium along the said path, in a reference position in the path, counting means connected to the transducer means to count the leading said portion only of each electrical signal produced by the transducer means according to the direction of movement of the film, comparing means connected to the counting means and the storage means and operative to compare the instantaneous count of the counting means with the said identifying number in the storage means whereby to produce a control signal when the instantaneous count corresponds with the identifying number, control means responsive to the control signal to produce a transport mechanism arresting signal when the leading portion of the particular desired marker is sensed by the counting means, and delay means for delaying the application of the transport mechanism arresting signal to the transport mechanism by a pEriod related to the width of the marker and the speed of the medium whereby to halt the medium in a position in which the transducer means lies midway between the two portions of the selected marker and which position corresponds to said reference position.
2. Apparatus according to claim 1, including means operative to add a predetermined number to the count of the counting means so that, as the recording medium moves along the said path, the instantaneous count of the counting means is in excess, by the amount of the said pre-determined number, of the number of electrical signals counted, the said control means comprising first means operative immediately the control signal occurs to produce a transport mechanism speed reducing signal, and second means operative to produce the said transport mechanism arresting signal when the number of electrical signals produced by the transducing means after occurrence of the said control signal becomes equal to the said predetermined number.
3. In apparatus having a transport mechanism for driving, along a predetermined path, a longitudinally movable recording medium having a plurality of longitudinally arranged areas in which information can be recorded and a respective marker associated with each area, and transducer means adjacent the said path and producing a respective electrical signal in response to the movement of each marker therepast, a control system for halting the medium, the control system comprising first storage means operative to store an identifying number identifying a particular desired marker which is to be positioned, by appropriate movement of the recording medium along the said path, in a reference position in the path, counting means connected to the transducer means to count each electric signal produced by the transducer means, second storage means for storing a predetermined number means connecting the second storage means to the counting means and operative when an identifying number has been stored in the first storage means to add the predetermined number to the counting means, comparing means connected to the counting means and the first storage means and operative to compare the instantaneous count of the counting means with the said identifying number in the first storage means whereby to produce a control signal when the instantaneous count corresponds to the identifying member, the control means being operative immediately the control signal occurs to produce a transport mechanism speed reducing signal and being operative when the number of electrical signals produced after the occurrence of the said control signal becomes equal to said predetermined number to produce a transport mechanism arresting signal, and manually settable switch means operative to set the predetermined number in the second storage means in accordance with the frequency, per unit length of the medium, of the said longitudinally arranged areas.
4. Apparatus according to claim 1, including an electromagnetically operable brake connected to the control means and responsive to the transport mechanism arresting signal to halt the transport mechanism driving the film, an electromagnetically operable clamping arrangement connected to the control means and responsive to the halting of the film to clamp the medium immediately around the area associated with the desired marker, and switch means in circuit with the electromagnetically operable brake and the clamping arrangement and responsive to the withdrawal of a housing, housing the medium, from the transport mechanism to release the brake and the clamping arrangement to allow the medium to be readily removed from the transport mechanism.
5. Apparatus according to claim 3, including an electromagnetically operable brake connected to the control means and responsive to the transport mechanism arresting signal to halt the transport mechanism driving the film, an electromagnetically oeprable clamping arrangement connecTed to the control means and responsive to the halting of the film to clamp the medium immediately around the area associated with the desired marker, and switch means in circuit with the electromagnetically operable brake and the clamping arrangement and responsive to the withdrawal of a housing, housing the medium, from the transport mechanism to release the brake and the clamping arrangement to allow the medium to be readily removed from the transport mechanism.
6. Apparatus according to claim 4, wherein said control means includes manually operable stop means which when operated actuates the electromagnetically operable brake to halt the medium immediately.
7. Apparatus according to claim 6, wherein the control means includes an inductor responsive to the passage there-past of metallised members located at opposite end portions of the medium, said inductor being connected to the stop means to actuate the stop means when a said metallised member is sensed.
8. Apparatus according to claim 7 wherein the control means includes first means connected to the indoctor and responsive to the inductor sensing a said metallised member to reverse the drive of the transport mechanism after the medium has been halted, and second means connected to the transducer and responsive to the transducer sensing the first marker beyond the said metallised member after the reversal of the drive of the transport mechanism to actuate the stop means to halt the medium.
9. Apparatus according to claim 5, wherein said control means includes manually operable stop means which when operated actuates the electromagnetically operable brake to halt the medium immediately.
10. Apparatus according to claim 9, wherein the control means includes an inductor responsive to the passage there-past of metallised members located at opposite end portions of the medium, said inductor being connected to the stop means to actuate the stop means when a said metallised member is sensed.
11. Apparatus according to claim 10, wherein the control means includes first means connected to the inductor and responsive to the inductor sensing a said metallised member to reverse the drive of the transport mechanism after the medium has been halted, and second means connected to the transducer and responsive to the transducer sensing the first marker beyond the said metallised member after the reversal of the drive of the transport mechanism to actuate the stop means to halt the medium.
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