Abstract: A camera, which is equipped with a magnetic head for recording data in a magnetic track of a film strip of a type having a perforation formed in the magnetic track and positioned at a specified distance from the last image frame toward a film trailer, has a controller for continuously advancing the film strip until the film makes the perforation pass over the magnetic head so as thereby to rub a contact surface of the magnetic head with edges of the perforation for cleaning.

Abstract: A filtering system for use with a reader for reading pulse position modulation (PPM) binary data recorded on a record medium in a relative movement to the record medium, the filtering system includes a filter which filters PPM binary data; a detector which detects a relative movement speed between the reader and the record medium; and a setter which sets a band cutoff frequency of the filter in accordance with a detected relative movement speed and a data recording density.

Abstract: A camera or an apparatus to which a film having a magnetic storage part is applicable, or a unit adapted for the camera or the apparatus, includes a magnetic head for acting on the magnetic storage part of the film, and a holding member arranged to hold the magnetic head and having a space for disposing a predetermined structure, which space is located in a direction approximately perpendicular to a moving direction of the film with respect to the magnetic head, or a movable holding member arranged to hold the magnetic head and having a space for disposing a predetermined structure.

Abstract: A magnetic data recording apparatus magnetically records various items of data on a film in accordance with a feed of the film by a PPM Pulse Position Modulation (PPM) recording method. The apparatus includes a PPM signal converting circuit for converting the data to be recorded into a PPM signal and outputting the PPM signal, a magnetic head and a head driving circuit for driving the magnetic head on the PPM signal outputted from the PPM signal converting circuit. The apparatus further includes a data quantity calculating circuit for calculating a quantity of the data to be recorded during a feed of the film. The PPM signal converting circuit determines a change-of-signal position of the PPM signal within one period on the data quantity calculated by the data quantity calculating circuit.

Abstract: A camera having a shielding device to prevent leaked magnetic flux generated by a drive motor from affecting magnetic information recorded on film in a camera in which a drive motor is provided within a winding spool. The shielding device includes an inner shielding member and an outer shielding member which shield magnetic flux from the drive motor, even if the intensity of the magnetic flux leaked from the motor fluctuates. The outer shielding member is made of permalloy B with a high maximum relative permeability, and is provided outside of a motor housing case for the drive motor. The motor housing case forms the inner shielding member, and is made of pure iron having a high saturated magnetic flux density. The leaked magnetic fluxes generated by the drive motor having a strong magnetic field intensity are shielded by the motor housing case while other leaked magnetic flux having a weak magnetic field intensity is shielded by the outer shielding member.

Abstract: An improved film pressure plate of a camera for use with a film having a magnetic recording portion is provided. The film pressure plate comprises a magnetic head for recording magnetic information onto the magnetic recording portion of the film and a film contact surface which may include a plurality of small projections formed on a portion of a surface of the film pressure plate. The projections are not provided on at least one of a lengthwise elongated area, which includes the magnetic head, and a widthways elongated area, which may also include the magnetic head. As a consequence of this arrangement, a flatness of the film is assured by pressing the film against the exposure aperture of the camera.

Abstract: The present invention relates to a photographic processing apparatus including a construction for cleaning a magnetic recording portion of a photographic film having such magnetic recording portion. The apparatus includes a transporting mechanism for transporting the film along a film transport passage, a magnetic head for recording magnetic information recorded in the magnetic recording portion, and a stationary head disposed upstream in the film transport passage for cleaning the magnetic recording portion of the film.

Abstract: A camera includes a feeder for feeding a film having magnetic recording portions, a reader for magnetically scanning magnetic recording portions to generate scan signals, and a judger for judging whether or not a magnetic recording portion has been recorded with magnetic data by comparing scan signals with a threshold value, and a warning device for generating a warning when judgment of the judger is impossible. This apparatus can ensure more accurate judgment as to whether a signal picked up from each recording portion is a magnetic signal.

Abstract: A magnetically recordable photographic film has perforations each being in at least one side edge region of the film lying between adjacent image areas (frames). A magnetic recording track region extends throughout the overall length of the side edge region adjacent to each frame in at least one side edge of the film. Camera information is recorded on the side edge track region. Information is read and rewrote on the film in camera. Film information is recorded on the leading end of film, and recording extension may be provided additionally. The film information is read and recorded on the film for each of the frames. Signals for clock and data are based on three-bit encoded data, and a pulse period can be varied depending on film transport speed. Such signals may be selected to have a frequency corresponding to the film transport speed.

Abstract: A lens-fitted photo film unit contains a cartridge shell into which an IC memory is incorporated, and a roll of photo filmstrip having a magnetic recording layer. Unit ID data and date-of-manufacture data are written in the IC memory in the factory. A data recording circuit is provided on a flash circuit board. The data recording circuit is connected to the IC memory through a printed circuit board mounted to a cartridge chamber of the film unit. A finder mask and a photo sensor for detecting the position of the finder mask are mounted in the film unit. The photo sensor is connected to the data recording circuit, to write photographic data corresponding to the output of the photo sensor in the IC memory at each exposure. Before printing, the data written in the IC memory is read to be recorded on the magnetic recording layer of the photo filmstrip by use of an external recording device which is connectable to the IC memory through an interface terminal which is exposed to an exterior of the film unit.

Abstract: The present invention relates to a camera for performing magnetic recording in a magnetic track on a film. In such a camera, the type of the film is judged, and data necessary for printing is prohibited from being recorded when the film is a positive.

Abstract: A camera provided with a magnetic head for effecting at least one of writing information into a magnetic portion of a film and reading information from the magnetic portion. The camera includes a detection circuit for detecting a feed speed of the film and a prohibiting circuit for prohibiting a photographing operation of the camera when the feed speed of the film detected by the detection circuit is lower than a predetermined speed.

Abstract: Respective image representations of a scene in front of a camera are recorded on a recording medium, such as a filmstrip, when the camera is at two separated viewpoints with respect to the scene, in order to obtain a matched pair of right-eye and left-eye pictures that can be simultaneously viewed to present a stereoscopic image of the scene. Respective indications are recorded on the recording medium, distinguishable from the image representations, that the image representations were recorded with the camera at the two separated viewpoints with respect to the scene. Thus, the matched pair of pictures can be kept in the right order for stereoscopic right-eye and left-eye viewing.

Abstract: In a photographic system including means for magnetically recording/reproducing data relative to magnetically coated film, an assembly for conforming a thin film magnetic head array to the nonplanar magnetic surface during data transfer only, the assembly comprising: a platen for holding magnetically coated film in a film plane; a magnetic head array including first and second thin film heads located side-by-side and a third thin film head located fore or aft the first and second heads and forming an equilateral triangle of their centers; a head mounting spring fixed at one end to the platen and having a free end for mounting the magnetic head array adjacent to magnetically coated film transported through the film plane the mounting spring allowing pitch and roll movement of the head assembly; and a loading spring for biasing the magnetic head array into contact with the magnetically coated film so that the point of contact is at the center of gravity of the three head magnetic head array.

Abstract: In a photographic apparatus which handles film having a magnetic layer on one side for magnetically storing data on the film, a photographic film transport mechanism including a magnetic head suspension system that allows balanced roll motion of two magnetic heads while in contact with the nonplanar magnetic recording surface of film, and allows for in contact magnetic recording during transfer of data only, with release of the contact pressure at all other times, the mechanism comprising: a platen for confining film that is transported past the platen; a cantilever spring having one end fixed to the platen and a free end, the spring extending in the direction of transport of the film; a pair of magnetic heads; means for mounting the pair of magnetic heads side-by-side on the free end of the cantilever spring which allows the heads to rotate about a roll axis parallel to the film transport direction; and means coupled to the free end of the spring for moving the heads into and out of contact with the film.

Abstract: An automated film processing system, comprising: a film having at least one recordable section for storing at least one customer selected electronic address; a film finishing system for reading the electronic addresses recorded on said film, developing said film, digitizing the images developed on said film, and for transmitting the digitized images to the customer selected electronic addresses; and at least one customer station, remotely located from said film finishing system, said station electronically connected to said film finishing system for receiving and displaying the digitized images when addressed by said film finishing system. Photographs taken by a photojournalist are automatically communicated to a remotely located news agency by recording a telecommunication address for the remote location on the film. The data can be prerecorded on the film or recorded by the photographer before dispatching the film to a processor.

Abstract: A non-photographic strip includes a base layer similar in properties and characteristics to a base layer of a known photographic filmstrip and a magnetic recording layer over the base layer. A cartridge is sized and shaped to be received in a cartridge receiving chamber of a photographic camera. The cartridge contains the non-photographic strip which is sized and shaped to be moved within the camera from the cartridge. Preferably, the magnetic recording layer is opaque. The magnetic recording layer is used to transfer information to and/or from the camera.

Abstract: When a volume of magnetic information to be recorded in a film exceeds a recording capacity of the film, a part or all of the magnetic information is recorded in an outer record medium. At this time, ID information which identifies the outer record medium is recorded in a leader track on the film, so that the film can correspond to the outer record medium. An ID number, for example, is used as the ID information. When the magnetic information is read out from the film, the ID information which identifies the outer record medium is read out at first. Then, it is judged whether the outer record medium is used or not. If the outer record medium is used, the magnetic information is read out from the outer record medium, and various kinds of processing are carried out in accordance with the readout magnetic information and the magnetic information which is recorded on the film.

Abstract: A method of setting recorded data bit cell length on an APS film magnetic layer in a camera of the type having apparatus for normally setting bit cell length as a function of measured film transport velocity. The method comprises detecting the occurrence of an invalid film velocity measurement and substituting a default data recording frequency that results in a recorded bit cell length on the film which ensures that a maximum number of intended data bits are recorded in a given available length of data track which might otherwise not result if the invalid film velocity measurement were used to set the recorded bit cell length.

Abstract: A camera includes a feeder for feeding a film having magnetic recording portions, a reader for magnetically scanning magnetic recording portions to generate scan signals, and a judger for judging whether or not a magnetic recording portion has been recorded with magnetic data by comparing scan signals with a threshold value, and a warning device for generating a warning when judgment of the judger is impossible. This apparatus can ensure more accurate judgment as to whether a signal picked up from each recording portion is a magnetic signal.

Abstract: The film feed control apparatus performs frame feed operation in which a photographic film is fed in a specific direction when a given photographic frame of the photographic film is being set at a specific position, and the photographic film is stopped when a next photographic frame is set at the specific position. The film feed control apparatus is provided with a feed device that feeds the film, and a control device that controls the feed device in such a manner that, when an unfinished film, which includes exposed frames and unexposed frames, is loaded, stops the film if an unexposed frame is set at the specific position while the unfinished film is being fed in the specific direction, which is the same as the direction of film feed during the frame feed operation.

Abstract: Malfunction is prevented in a camera which allows setting of print number at the time of photographing. In the camera, whether the film is a reversal film or not is determined. When the loaded film is a negative film, a print number is initially set to 1. If the loaded film is a reversal film, the print number is initially set to 0. However, when a select switch is ON, the set number is 1, similar to the case of a negative film. The setting is for a counter CPRT storing the print number data.

Abstract: At first, the film in a film cartridge is wound up. Next, the film is rewound into the film cartridge, and a perforation indicating a reference position of each frame is detected. Then, predetermined information corresponding to the detected perforation is recorded in the magnetic layer. In another embodiment, when the perforation provided closest to the forward end of the film is detected, the film is rewound a required length. Then the magnetic recording is performed after the rewinding is completed. In another embodiment, two detectors for detecting a perforation is provided. One detector is apart from the other by a multiple of a distance between frames. Every time one detector detects a perforation, magnetic recording/regenerating is carried out.

Abstract: In photographic equipment for reading magnetically recorded data on a film strip, gradual degradation of the read data signal caused, for example, by material buildup on the magnetic read head is detected by monitoring the read data signal to indicate when the signal falls below a normal signal level but is still above a minimum threshold at which data loss would result. Apparatus useful for this purpose includes first and second comparators for sensing the decline of the data signal level into a range falling between a first predetermined normal signal level threshold and a second lower predetermined signal level preferably at or slightly above minimum detectable signal level. With such an arrangement, even though data is still capable of being read and decoded, the operator of the data read equipment is given advance warning of the incipient read data problem sufficiently in advance of read failure condition to allow corrective action, e.g. cleaning of the read head, before actual data read failures occur.

Abstract: This invention relates to a camera of a type for writing or reading out information on or from a magnetic track provided to a film using a magnetic head. This invention provides a camera of the type which has a regulating member which contacts an end face, in the widthwise direction, of a film to regulate the position, in the widthwise direction, of the film, and in which a surface portion, near the regulating member, of a surface formed between inner and outer rails of a camera main body is formed at a higher level than that of the remaining surface, thereby minimizing deformation of the film on the surface between the inner and outer rails when the end face of the film is regulated by the regulating member.

Abstract: A magnetic reading and/or recording apparatus comprises a magnetic reading and/or recording head for reading and/or recording information from/on a magnetic information track on a photosensitive material having a natural longitudinal curl which when longitudinally straightened assumes an inherent transverse curl; and edge follower means attached to the magnetic reading and/or recording head for tracking a longitudinal edge of the photosensitive material in response to movement of the photosensitive material. Means are substantially aligned with the edge follower means for bending the photosensitive material in a direction perpendicular to the transverse curl to eliminate the transverse curl of the photosensitive material.

Abstract: A magnetic recording method for recording data on a magnetic recording layer of a photographic filmstrip. A block is written on a track while the filmstrip is advanced by one frame. Each block comprises at least a field. Each field has a field start code in the beginning, and a pair of 8-bit ID codes are recorded following the field start code. The ID codes represent the information items of the information content contained in the field in a composite fashion. The ID codes are followed by a series of data representative of the content of the information. The end of each field is allocated to a parity check bit.

Abstract: An apparatus in which photographic film is fed out of a film cartridge and is led through a film path to a spool chamber to be wound on a take-up spool includes a film guide that extends from the end of the film path toward the spool chamber. The film guide reliably guides the film, which has been led to the spool chamber, to the take-up spool. The film guide ensures that the film is properly wound on the take-up spool by preventing it from prematurely curling within the spool chamber. The film guide also ensures that magnetic recording operations performed on the film by a recording head, if present, are also reliably performed.

Abstract: A camera or an apparatus adapted to use a film with a magnetic memory portion, or a device adapted for such a camera or an apparatus has a magnetic head for at least one of writing information to the magnetic memory portion of the film and reading information from the magnetic memory portion, and a tool application portion for applying a tool for checking the performance of the magnetic head.

Abstract: A photographic camera is provided with magnetic recording means including a frequency selection circuit responsive to a controller to iteratively record data on a magnetic recording layer formed on photographic film with each iteration being recorded at a different recording frequency. Suitable selection of recording frequencies for a range of expected film speeds will result in a predetermined number of recorded iterations for which respective bit densities and cumulative recorded track length will fall within predetermined acceptable limits established for reliable reading of the data by subsequent data read circuits.

Abstract: A method and system for detecting and coding information regarding the defects into a photosensitive web containing a magnetic media. The system includes a scanner for scanning a photosensitive web for determining defects and producing a signal which provides information with respect to the defect. The system further includes a device for taking the signal and transforming it to a form capable of being placed on the magnetic media; and a recording head for recording the information onto the web. The information read may be used to locate and remove the area of the web containing the defect or advancing the web so that the portion of the web having the defect will not be used.

Abstract: A camera of the kind having a magnetic head for magnetically recording data in a track part of each frame portion of a film is arranged such that, in re-recording information in the track part having a previous record of data, a predetermined signal for erasing information is supplied to the head during a period other than a period during which a data signal is supplied to the head, so that new data can be recorded by completely erasing, without fail, the previous record of data in carrying out the re-recording.

Abstract: A mechanism, for reproducing images of a developed film, which reads film information recorded in a magnetic track formed along a pair of edges extending longitudinally of a leader of the film. The reading of the magnetic track is carried out by pressing a magnetic head against the magnetic track of the film leader at the time of rewinding into a cartridge case the film which is once fed out a predetermined length from the cartridge case. When the film is rewound into the cartridge case at the time of reading the film information, the surface of the film leader is pressed by the magnetic head uniformly because the film leader is tightened even and flat by a tension working between the cartridge case and the magnetic head.

Abstract: A camera has a closable rear lid, and an information processing unit for performing at least one of (i) writing information to a recording medium provided in a film, and (ii) reading information from the recording medium. The camera includes a movable member movable between a first position and a second position. At the first position, the information processing unit is separated from the film. At the second position, the movable member urges the film against the information processing unit. A drive source applies a drive force to the movable member to move the movable member from the first position to the second position. A holding device applies a holding force to hold the movable member at the first position. In response to the closing of the rear lid of the camera, an allowing device to allow the movable member to be released to move to the second position.

Abstract: A camera capable of recording information uses a film cartridge that includes a spool for rolling a film that includes a data recording portion. A pair of elastic flanges having annular lips peripheries thereon are provided on the spool for nipping successive convolution of the film. The film is propelled out of the cartridge by rotating the spool in a predetermined direction. The camera further comprises a feeding member for winding the film fully when the cartridge is loaded into the camera and rewinding the film into the cartridge in response to the completion of a film exposure. A recording means is also provided in the camera. The rewinding means serially records the information onto the recording portion of the film when the film is rewinding.

Abstract: A camera or an apparatus for a camera, which is arranged to record photographed-frame information indicative of a photographed frame on photographed frames of a film on a frame-by-frame basis, comprises an indication device which gives a midroll interrupt indication for rewinding a film which is partway used into a film cartridge, a film transport device which rewinds the film which is partway used into the film cartridge in accordance with the midroll interrupt indication given by the indication device, and a determination device which determines whether the photographed-frame information is recorded on photographed frames of the film on a frame-by-frame basis, while the film transport device is rewinding the film into the film cartridge in accordance with the midroll interrupt indication given by the indication device.

Abstract: A camera capable of magnetic recording includes a pressing pad for a magnetic head. The pressing pad is secured to the camera body and the head is made movable in order to increase the proximity of the head to the film and to enable reliable application to a low-cost, compact focal plane shutter camera. Above and below the aperture in the camera body, there are provided a pair of film rails and a pair of pressure plate rails formed so as to be higher than the film rails. An extended portion is formed on the film rail, and in the center of the extended portion, a recessed portion is made. A graded portion is formed to the left side of the extended portion, and a circular arc portion is formed to its left side. Below the pressure plate, there are provided a hole through which the magnetic head is secured to an actuating member with a mounting portion pressing the film, and a pair of stoppers for limiting the displacement of the magnetic head in the optical axis direction.

Abstract: An information processing device configured to conserve power consumption of the battery. The device uses a recording medium with a magnetic recording unit. A power source supplies power to at least one assembly, which retrieves and/or records information on the recording medium. The power is supplied to retrieve and/or record information only when the respective assembly is in operation. The device can be a camera using film as the magnetic recording medium.

Abstract: An information magnetic recording apparatus according to the present invention has: a magnetic recording head that magnetically records on a film; a magnetic recording signal conversion device that converts information to a magnetic recording signal; a head driving circuit that drives the magnetic recording head based on the magnetic recording signal that is outputted from the magnetic recording signal conversion device; and a temperature detection circuit that detects a temperature around the head driving circuit and determines whether or not the temperature is abnormal. And the magnetic recording signal conversion device stops outputting the magnetic recording signal if the temperature detection circuit detects that the temperature is abnormal.

Abstract: A film loading and unloading mechanism sends out a film from a cartridge in which a film with a magnetic recording portion is contained and rewinds the film. A magnetic information reading and writing mechanism reads information recorded in the magnetic recording portion of the film and may write change information in the magnetic recording portion. An image reading mechanism reads image information recorded in the film. An output device outputs both types of information. The magnetic data recorded on a film with a magnetic recording portion is read, and displayed on the monitor screen, allowing bit error and damage of magnetic data to be checked.

Abstract: In a camera having an exposure gate and a transport for transporting film past the exposure gate, the film having a series of perforations along at least one edge of the film, wherein the number of the perforations are an integer per exposure frame, the film having a substantially transparent magnetic layer at least in the region of the perforations, a mid-roll change apparatus. The mid-roll change apparatus includes a source of a steady-state magnetic field located downstream of the exposure gate and adjacent to the series of perforations for magnetizing the magnetic layer between the perforations as film is transported past the source; a magnetic field sensor located upstream of the exposure gate and adjacent to the series of perforations for sensing fringing magnetic fields emanating from perforation edges, the area between which have been magnetized; and a perforation sensor located to sense the series of perforations of the film.

Abstract: A magnetic recording method or device for recording binary code data on a magnetic recording track of photo film while moving the photo film in a direction on a magnetic head. Each bit of the binary code data is recorded as a bit segment of a constant length constituted of a forward magnetic zone magnetized in a forward direction identical to a film advance direction, and a reversed magnetic zone magnetized in reverse to the forward direction and disposed behind the forward magnetic zone. The forward magnetic zone has one of two different lengths within each bit segment depending upon binary value of the bit segment. An additional reversed magnetic zone is recorded immediately before a start bit segment of the binary code data, for a time period which is determined for recording the forward magnetic zone of the start bit segment.

Abstract: A system and method for controlling the photofinishing of a roll of photosensitive material in accordance with the customer usage of the film. The film having a magnetic layer on which an instructional code is placed either by the manufacturer and/or user of the film. The instructional code is indicative of the preferential subject matter to be photographed. The system may include a camera for use in reading the predetermined code and adjusting the camera settings in accordance with the instructional code. The photofinisher can use the instructional code so as to properly manipulate the image during processing and/or printing in accordance with the instructional code.

Abstract: A judging device for judging an unexposed frame of a film having a magnetic recording portion recordable with a magnetic signal, includes: a magnetic header for scanning the magnetic recording portion; a divider for dividing the magnetic recording portion into a plurality of blocks; a first judger for judging whether blocks bear a magnetic signal block by block; and a second judger for judging whether the frame corresponding to the magnetic recording portion has been exposed.

Abstract: A camera, which uses a film with a magnetic memory portion, or a control apparatus for such a camera, includes a first detection sensor for detecting a perforation of the film, arranged at a first position where the perforation of the film passes, a second detection sensor for detecting the perforation of the film, arranged at a second position where the perforation of the film passes and which is shifted from the first position in the direction in which the film is transported, and a control circuit for determining a starting time, a first stopping time, a writing frequency of writing information to the magnetic memory portion of the film, and a second stopping time to stop transporting the film, in response to the first and second detection sensors.

Abstract: A camera is detachably mountable with a film cartridge which is provided with a photographic film having a number of successive frames and a film state indicator operable to indicate an exposed state that the film is already exposed, and includes: a film feeding device which feeds the film in a first direction and in a second direction opposite to the first direction; a recording device which records a specified data on the film when the film is being fed in the first direction; a judging device which judges whether the specified data is recorded on the film when the film is being fed in the second direction; and a setting device which is responsive to the judging device and associated with the film state indicator of the film cartridge, and is operable to cause the film state indicator to indicate the exposed state when the specified data is judged not to be recorded on the film.

Abstract: A magnetic read/write head suspension assembly and support roller particularly for use for recording and reading information on a magnetics-on-film (MOF) layer outside the image area of photographic filmstrips. The filmstrip is pressed against the support roller by upstream and downstream wrap rollers so that an angle of wrap over a predetermined length of the filmstrip in the filmstrip transport direction is achieved around the circumferential surface of the support roller that tends to flatten out cross film curl. Magnetic read/write heads are supported to bear against the edge regions of the filmstrip MOF layer opposite to the support roller and within the angle of wrap. The magnetic read/write heads are supported in a nesting VEE arrangement so that the head gaps can make a line contact of a predetermined head gap length extending in the direction of the filmstrip width.

Abstract: A filmstrip which has a substantially transparent magnetic layer is loaded into a camera. Successive sections of the filmstrip are moved inside the camera to locate corresponding sections of the magnetic layer adjacent an inside face of a magnetic-film-write-on portion of the camera. A hand held stylus is manually moved on an outside face of the magnetic-film-write-on portion, opposite the inside face, to record hand-generated information magnetically on the magnetic layer.

Abstract: A camera capable of automatic film rewinding into the magazine, comprises an information recording device for recording at least information on use in an information recording portion formed at a predetermined position of the magazine loaded in the magazine chamber of the camera, an information detecting means capable of detecting recorded information of the magazine when it is loaded, a prohibition device for prohibiting the photographing operation in response to a detection signal corresponding to information, indicating that all the film is already used, detected by the information detecting device and a control device for controlling the information recording device, information detecting device and prohibition device in such a manner that the detection by the information detecting device is conducted prior to the recording of information of use by the information recording device, and that the photographing operation is prohibited in response to the detection of information indicating that all the film i

Abstract: A camera, which is equipped with a magnetic head for recording data in a magnetic track of a film strip of a type having a perforation formed in the magnetic track and positioned at a specified distance from the last image frame toward a film trailer, has a controller for continuously advancing the film strip until the film makes the perforation pass over the magnetic head so as thereby to rub a contact surface of the magnetic head with edges of the perforation for cleaning.