Magnetic head cleaning system and cleaning unit for use therein having a cleaning member capable of rotatively shifting

Abstract: A system for cleaning a magnetic head (51) provided inside a rotary drum (4,6) installed on a chassis (1) in cooperation with a mechanism for guiding a tape. The system has a cleaning device including a cleaning lever (9,50) capable of pivoting freely, supported by a pivot (12) secured to the chassis, a cleaning member (11), a spring (13) for urging the cleaning lever so that the cleaning member may contact with the rotary drum and a pin (9c) fixed on the cleaning lever. The system also has a tape guiding mechanism including tape guiding members (5-8) and a drive member (15,16,19-26) for shifting the tape guiding members, capable of pivoting freely. The arrangement permits cleaning of the magnetic head by making the cleaning member contact with the rotary drum, and also permits separation of the cleaning member from the rotary drum by making the drive member (19) contact with the pin (9c). The cleaning member (49) is supported by a shaft (47) inclining from an axis perpendicular to a reference surface of the rotary drum and having a length enough to reach a position corresponding to the top portion of the drum, and adapted to be shifted upward along the shaft while rotating in cleaning operation.

Description: FIELD OF THE INVENTION The present invention relates to a magnetic head cleaning system including a magnetic head cleaning device, and to a cleaning unit installed in the magnetic head cleaning device, for use in rotary drum type magnetic recording-reproduction apparatus such as VTRs or other apparatus. Such a cleaning system is, for instance, known from JP-A-12 82 716. BACKGROUND OF THE INVENTION As shown in Fig. 9, in a conventional magnetic head cleaning system, for example, loading grooves 57, 58 are formed through a chassis 55 by the left side and right side of a rotary drum 56, and pole bases 59, 60 are respectively disposed therein, which can be shifted guided by the respective loading grooves 57, 58. Poles 61, 62 are respectively secured to the pole bases 59, 60. At a vicinity of one end of the loading groove 58, is disposed a cleaning lever 65 capable of pivoting freely, supported by a pivot 66 secured to the chassis 55. The cleaning lever 65 has a cleaning member 63 rotatably supported by a cleaner shaft 64. The cleaning member 63 is disposed at one end of the cleaning lever 65 by the side of the rotary drum 56, and at the other end thereof is fixedly inserted a pin 67. A connecting bar 68 is connected to the cleaning lever 65 by the pin 67. In the connecting bar 68, are formed elongated holes 69, 70 which are respectively guided by pins 71, 72 secured to the chassis 55. Further, as shown in Fig. 9, at an opposite end of the connecting bar 68 to the end where the cleaning lever 65 is connected, is formed an extended portion 68a which is adapted to contact the pole base 60 in unloading state which will be described later. Furthermore, the connecting bar 68 is provided with a spring 73 whereby a force is applied thereto in a direction as indicated by an arrow N. Furthermore, at a position on the cleaning lever 65 at a vicinity of the loading groove 58, is formed a convex portion 65a which is adapted to contact with the pole base 60 having been shifted along the loading groove 58 in loading operation which will be described later. On the other hand, a cam 74 is installed on the undersurface of the chassis 55, located at a position opposite to the rotary drum 56, having the connecting bar 68 in-between. Further, in the undersurface of the chassis 55, is installed a transmission gear drive lever 75 which is engaged with the cam 74 through a pin 77. The transmission gear drive lever 75 capable of pivoting freely, is supported by a pivot 76 secured to the chassis 55. An end of the transmission gear drive lever 75 is connected to a loading transmission gear 79 by a pin 78. Moreover, as is also shown in Fig. 10, a loading gear 80 and further a loading gear 81 are connected to the loading transmission gear 79, and a lever 85 is connected to the loading gear 80 through a lever 82 while a lever 83 is connected to the loading gear 81 through a lever 84. The levers 83, 85 are connected to the respective pole bases 59, 60 by pins 86, 87. Further, as shown in Fig. 11, on the surface of the chassis 55 is installed a cam 88 at the same location as the cam 74, and a drive lever 91 connected to the cam 88 by a pin 89 is supported by a pivot 90 secured to the chassis 55, being permitted to rock freely. An end of the drive lever 91 is connected to a half-load lever 93 through a pin 92. The half-load lever 93 is supported by a pivot 94, being permitted to rock freely so that a tape 96 can be guided by a half-load shaft 95 disposed on the half-load lever 93 in fast forward operation or rewinding operation (half-loading) of the tape 96. The following description will discuss the operation of the mechanism. When there is no tape to be operated (unloading), the pole bases 59, 60 are located at unloading positions, namely, positions as is shown in Fig. 9. The connecting bar 68, having been shifted in a direction indicated by an arrow N' by being pressed at the extended portion 68a thereof by the pole base 60, is positioned at the N' side. As a result, the cleaning member 63 is located at a position away from the rotary drum 56. When tape loading (hereinafter referred to as loading) is started, which is defined as an action to draw the tape 96 from a cassette case, not shown, and wrap it onto the rotary drum 56, the cam 74 is rotated in a direction indicated by an arrow L by a motor, not shown, and subsequently, the transmission gear drive lever 75 pivots in a direction indicated by an arrow M on the pivot 76. Further, following the pivoting of the transmission gear drive lever 75, the loading transmission gear 79, loading gear 80 and loading gear 81 pivot. Following the pivoting of the loading gears 80 and 81, the respective levers 82, 85 as well as levers 84, 83 are shifted, whereby the pole bases 59, 60 are moved along the respective loading grooves 57, 58. When the pole base 60 is moved, the connecting bar 68 is shifted in a direction indicated by the arrow N, guided along the elongated holes 69, 70 by the spring 73, as shown in Fig. 12. Thus, the cleaning lever 65 coupled to one end of the connecting bar 68 pivots around the pivot 66, whereby the cleaning member 63 comes into contact with the rotary drum 56. On the other hand, simultaneously with the start of loading, the rotary drum 56 rotates and magnetic heads installed inside the rotary drum 56 are cleaned by the cleaning member 63. Further, when the pole bases 59, 60 have been shifted by the rotation of the cam 74, the pole base 60 comes into contact with the convex portion 65a of the cleaning lever 65 as is shown in Fig. 9, and the cleaning member 63 separates from the rotary drum 56 again by the pivoting of the cleaning lever 65, thereby completing the cleaning operation. Additionally, as to methods for permitting the pivoting of the cleaning lever 65, besides the above method for permitting it in accordance with the shifting of the pole base 60, another method may be taken wherein a solenoid or other device is employed. Meanwhile, as shown in Fig. 13, the cleaner shaft 64 is disposed in a perpendicular direction to a reference plane of the rotary drum 56 such that the height at which the cleaning member 63 contacts with the rotary drum 56 is always kept constant. However, in the above arrangement, since the cleaning member 63 always contacts with the rotary drum 56 at the constant height in cleaning operation, abrasion to the cleaning member 63 occurs unevenly. More specifically, since the abrasion occurs only at a portion thereof with which a magnetic head 97 contacts, an abrasion portion 98 is produced on the cleaning member 63 as is shown in Fig. 14. Therefore, the arrangement has a problem that cleaning effect to the magnetic head 97 is reduced with operation time. On the other hand, in the aforementioned arrangement wherein cleaning for magnetic heads is performed together with loading operation, a problem is presented in that cost becomes higher; for example, in the case of operating the cleaning lever 65 by using a solenoid, it is necessary to provide an additional solenoid and driving circuit. Moreover, the arrangement shown in Fig. 9 also has problems that since it is necessary to provide the connecting bar 68 so as to shift the cleaning lever 65 in conjunction with the movement of the pole base 60, the number of parts is increased and larger space is required. According to one aspect of the present invention, there is provided a magnetic head cleaning system as claimed in claim 1. According to another aspect of the present invention, there is provided a method as claimed in claim 11. It is one advantage of the present invention to provide a magnetic head cleaning system wherein the number of parts is reduced and space is effectively utilized. There may additionally be provided a cleaning member which allows abrasion thereto to occur evenly and whose life may be extended. A magnetic head cleaning system in an embodiment of the present invention for cleaning a magnetic head installed inside a rotary drum disposed on a chassis during guiding a tape, comprises a cleaning device and tape guiding means. The cleaning device includes a cleaning lever capable of pivoting freely, supported by a shaft secured to the chassis, cleaning means installed at one end of the cleaning lever at the rotary drum side, a resilient member for urging the cleaning lever to permit the cleaning means to come into contact with the rotary drum, and pivoting means installed on the cleaning lever, whereby cleaning for the magnetic head is performed by permitting the cleaning means to contact with the rotary drum. On the other hand, the tape guiding means includes tape guiding members for guiding the tape and a drive member capable of pivoting freely, supported by a pivot secured to the chassis, for shifting the tape guiding members, whereby the drive member is adapted to permit the cleaning means to separate from the rotary drum by pressing the pivot member. Further, a cleaning unit of the present invention may comprise a cleaning member which is permitted to contact with a rotary drum provided with a magnetic head and to be rotated thereby so as to clean the magnetic head, and a support shaft which penetrates the cleaning member with a raked appearance inclining in the rotation direction of the rotary drum from an axis perpendicular to a reference plane of the rotary drum, and has a length enough to reach a position corresponding to the upper portion of the rotary drum. The cleaning unit may further include stop means for stopping the cleaning member, positioned at the top of the support shaft. With the arrangement, the cleaning lever is pivoted on the pivot when the drive member presses the pivoting means installed on the cleaning lever such that the cleaning means are separated from the rotary drum. When the drive member starts pivoting so as to shift the tape guiding members, pressing force onto the pivoting means by the drive member is released and at the same time, the cleaning lever is pivoted by the resilient member, thereby permitting the cleaning means to come into contact with the rotary drum. As a result, a cleaning operation can be performed. When the drive member further pivots and then the tape guiding member is shifted at a position where the tape guiding is completed, the cleaning lever comes into contact with the tape guiding members or the drive member and is pressed thereby such that the cleaning lever is permitted to pivot and the cleaning means is separated from the rotary drum, thereby completing the cleaning operation. Furthermore, with the above arrangement, when the cleaning member in the cleaning unit comes into contact with the rotary drum, the cleaning member is rotated by the rotation of the rotary drum while being shifted upward along the support shaft due to the raked structure of the support shaft. When the cleaning operation has been completed and the cleaning member is separated from the rotary drum, the cleaning member shifts itself downward along the support shaft by its own weight. For a fuller understanding of the nature and advantages of embodiments of the invention, reference should be made to the ensuing detailed description taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWING Figs. 1 to 4 show one embodiment of the present invention. Fig. 1 is a plan view illustrating the peripheral arrangement of a rotary drum in unloading state in a magnetic recording-reproduction apparatus. Fig. 2 is a plan view illustrating a main section of a mechanism for shifting pole bases. Fig. 3 is a plan view illustrating the peripheral arrangement of the rotary drum in loading operation. Fig. 4 is a plan view illustrating the peripheral arrangement of the rotary drum when loading operating has been completed. Figs. 5 to 7 show another embodiment of the present invention. Fig. 5 is a plan view illustrating the peripheral arrangement of a rotary drum in unloading state in a magnetic recording-reproduction apparatus. Fig. 6 is a plan view illustrating the peripheral arrangement of the rotary drum in half-loading operation. Fig. 7 is a plan view illustrating the peripheral arrangement of the rotary drum when half-loading operation has been completed. Fig. 8 is an explanatory drawing illustrating a rotary drum and a cleaning unit. Figs. 9 to 14 show the prior art. Fig. 9 is a plan view illustrating the peripheral arrangement of a rotary drum in a magnetic recording-reproduction apparatus. Fig. 10 is a plan view illustrating a main section of a mechanism for shifting pole bases. Fig. 11 is a plan view illustrating a main section of a mechanism for driving a half-load lever. Fig. 12 is a plan view illustrating a main section wherein a cleaning member contacts with the rotary drum. Fig. 13 is an explanatory drawing illustrating the rotary drum and a magnetic head cleaning unit. Fig. 14 is an explanatory drawing illustrating an abrasion section on the cleaning member. DETAILED DESCRIPTION OF THE EMBODIMENTS The following description will discuss one embodiment of the present invention referring to Figs. 1 to 4. As illustrated in Fig. 1, loading grooves 3, 4 are formed through a chassis 1 by the right side and left side of a rotary drum 2 installed thereon. In the respective loading grooves 3, 4, are disposed pole bases 5, 7 as tape guiding members having respective poles 6, 8 for guiding a tape 45 (see Fig. 6), and those pole bases 5, 7 are adapted to move along the respective grooves 3, 4. At a vicinity of one end of the loading groove 3, is disposed a cleaning lever 9 capable of pivoting freely by being supported by a pivot 12 secured to the chassis 1. At one end of the cleaning lever 9, by the side of the rotary drum 2, is installed cleaning means, for example, a cleaning member 11 freely rotatably supported by a cleaner shaft 10. Further, at side portions of the cleaning lever 9 are formed a projecting portion 9a as first pivoting means and a protruding portion 9b, and through the protruding portion 9b, a pin 9c as second pivoting means is secured thereto so that it can penetrate the chassis 1 through a hole 14 formed in the chassis 1. Moreover, to the same side portion of the cleaning lever 9 as the projecting portion 9a, is secured one end of a spring 13 as a resilient member with the other end thereof fixed to the chassis 1, thereby applying a force to the cleaning lever 9 in a direction indicated by an arrow A'. In the meantime, on the undersurface of the chassis 1, is disposed a transmission gear drive lever 16 as drive means which is capable of pivoting freely, supported by a pivot 18 as a fulcrum secured to the chassis 1. Through a pin 17 secured to one end thereof, the transmission gear drive lever 16 is coupled to a cam 15 disposed on the undersurface of the chassis 1, and the other end thereof is coupled to a loading transmission gear 20. Further, a pressing portion 19 is formed on the transmission gear drive lever 16 such that it comes into contact with the pin 9c in unloading state. Moreover, as also illustrated in Fig. 2, the loading transmission gear 20 is coupled to a loading gear 21 and hence a loading gear 22, and a lever 25 is connected to the loading gear 21 through a lever 24 while a lever 26 is coupled to the loading gear 22 through a lever 23. The levers 25, 26 are coupled to the respective pole bases 5, 7 by respective pins 27, 28. Thus, the cam 15, transmission gear drive lever 16, loading transmission gear 20, loading gears 21, 22, levers 23, 24, 25, 26 and pole bases 5, 7 constitute tape guiding means. The following description will discuss the operation in the above arrangement when loading. When there is no tape loaded, the pole bases 5, 7 are positioned in the respective loading grooves 3, 4 at respective end parts thereof opposite to the cleaning lever 9 as shown in Fig. 1. Further, the cleaning lever 9 pivots on the pivot 12 in a direction indicated by an arrow A when the pressing portion 19 of the transmission gear drive lever 16 comes into contact with and presses the pin 9c of the cleaning lever 9, and consequently allows the cleaning member 11 to be located at a position away from the rotary drum 2. When a loading operation is started, the cam 15 is rotated in a direction indicated by an arrow B by means of a motor (not shown), whereby the transmission gear drive lever 16 pivots around the pivot 18 in a direction indicated by an arrow C. Following the pivoting movement, the pressing force given by the pressing portion 19 is released, and the cleaning lever 9 is pivoted by the spring 13 in a direction indicated by the arrow A', thereby permitting the cleaning member 11 to come into contact with the rotary drum 2 as is illustrated in Fig. 3. The rotary drum 2 has been rotating since the start of the loading operation, and therefore at this point of time, a cleaning operation for the magnetic head of the rotary drum 2 is started by the cleaning member 11 contacted therewith. On the other hand, following the pivoting movement of the transmission gear drive lever 16, the loading transmission gear 20 connected to the one end thereof also rotates clockwise in Fig. 3, and consequently permits the loading gear 21, lever 24 and lever 25 to be respectively rotated or shifted. Thus, the pole base 5 is shifted along the loading groove 3. Similarly, the rotation of the loading gear 21 permits the loading gear 22, lever 23 and lever 26 to be respectively rotated or shifted, thereby shifting the pole base 7 along the loading groove 4. While the cam 15 is further rotated and the transmission gear drive lever 16 is further rocked, the pole bases 5, 7 are shifted along the respective loading grooves 3, 4 to be positioned at the other ends thereof opposite to the positions at the start of the loading operation through the loading transmission gear 20, loading gears 21, 22, levers 23, 24, 25 and 26, as is illustrated in Fig. 4, whereby the loading operation has been completed. At this time, since the pole base 5 comes into contact with the cleaning lever 9 at its projecting portion 9a, the cleaning lever 9 is pressed to be shifted in a direction indicated by the arrow A. As a result, the cleaning member 11 is separated from the rotary drum 2 again, thereby completing the cleaning operation of the magnetic head. The following description will discuss another embodiment of the present invention referring to Figs. 5 to 7. Additionally, those of the members having the same functions and described in the aforementioned embodiment are indicated by the same reference numerals and the description thereof is omitted. The present embodiment has an arrangement wherein a cleaning operation for a magnetic head can be performed in cooperation with a fast forward or rewinding (half-loading) operation of a tape. As illustrated in Fig. 5, a cam 30 is installed on a chassis 1, and one end of a drive lever 33 as drive means which is capable of pivoting freely, supported by a pivot 32, is coupled to the cam 30 through a pin 31. The drive lever 33 has a bent shape in its center portion, and an extended portion 33a is formed at the bent portion as is illustrated in Fig. 5. Further, the extended portion 33a has a first edge portion 33c as first pressure means and a second edge portion 33d as second pressure means, both of which are shaped by a cam portion 33b formed at one end of the extended portion 33a. The other end of the drive lever 33 is connected through a pin 41 to one end of a half-load lever 43 as a tape guiding member which is capable of pivoting freely, supported by a pivot 42 secured to the chassis 1. On the other end of the half-load lever 43, is installed a half-load shaft 44 for guiding a tape in half-loading operation which will be described later. The cam 30, drive lever 33 and half-load lever 43 constitute tape guiding means. On the other hand, between the extended portion 33a and the rotary drum 2 is installed a cleaning lever 35 capable of rocking, supported by a pivot 34 secured to the chassis 1. At one end of the cleaning lever 35, by the side of the rotary drum 2, is installed a cleaning member 38 freely rotatably supported by a cleaner shaft 37, while at the other end thereof, is installed a pin 36 as pivoting means which is adapted to come into contact with the first edge portion 33c of the extended portion 33a. Moreover, to the cleaning lever 35 is secured one end of a spring 40 as a resilient member, with the other end thereof fixed to the chassis 1 so as to permit the pin 36 to come into contact with the extended portion 33a. The following description will discuss the operation in the above arrangement when half-loading. As illustrated in Fig. 5, in a condition before a half-loading operation where there is no tape loaded, the pin 36 of the cleaning lever 35 contacts with the first edge portion 33c of the drive lever 33, whereby the cleaning member 38 is located at a position away from the rotary drum 2. When a half-loading operation is started, the cam 30 is rotated in a direction indicated by an arrow D by the motor (not shown), whereby the drive lever 33 pivots on the pivot 32 in a direction indicated by an arrow E. Following the pivoting movement, as illustrated in Fig. 6, the pin 36 comes into contact with the cam portion 33b of the extended portion 33a, and consequently the cleaning lever 35 pivots on the pivot 34 in a direction indicated by an arrow F, thereby permitting the cleaning member 38 to come into contact with the rotary drum 2. The rotary drum 2 has been rotating since the start of the half-loading operation, and therefore at this point of time, a cleaning operation for the magnetic head is started by the cleaning member 38 contacted therewith. In cooperation with the above movements, the half-load lever 43 coupled to the drive lever 33 by the pin 41 pivots on the pivot 42, whereby a tape 45 is guided by the half-load shaft 44. When the cam 30 further rotates, the drive lever 33 further pivots in the direction indicated by the arrow E, and consequently the pin 36, which has contacted with the cam portion 33b, comes into contact with the second edge portion 33d, as is illustrated in Fig. 7. According to the movement of the pin 36, the cleaning lever 35 pivots in a direction indicated by the arrow F', and the cleaning member 38 is separated from the rotary drum 2, thereby completing the cleaning operation for the magnetic head. With the above arrangement, in loading operation or half-loading operation for a tape, without employing conventional parts such as connecting bars or other members, cleaning operation for the magnetic head provided inside the rotary drum can be achieved in cooperation with the movements of the tape guiding members and the drive member for driving the tape guiding members. As a result, the arrangement presents the marked effect of reducing cost and saving space by reducing the number of parts required. The following description will discuss an advantageous arrangement of a cleaning member referring to Fig. 8. As illustrated in Fig. 8, a cleaning lever 50 is provided with a cleaning unit 52 having a cleaner shaft 47 as a support shaft and a cleaning member 49 which is freely rotatably supported by the cleaner shaft 47. The cleaner shaft 47 is installed on the cleaning lever 50 with a raked appearance inclining in the rotation direction of a rotary drum 46 indicated by an arrow R from an axis perpendicular to a reference plane of the rotary drum 46. Further, the cleaner 47 has a length enough to reach a position corresponding to the upper portion of the rotary drum 46, and a stopper 48 as stop means is secured to the top thereof. In the above arrangement, when the cleaning lever 50 is shifted to permit the cleaning member 49 to come into contact with the rotary drum 46 in rotation and thus a cleaning operation for a magnetic head 51 provided inside the rotary drum 46 is started, the cleaning member 49 rotates in accordance with the rotation of the rotary drum 46, and is shifted upward along the cleaner shaft 47 until it comes into contact with the stopper 48. When the cleaning operation has been completed and the cleaning member 49 is separated from the rotary drum 46, the cleaning member 49 shifts itself downward along the cleaner shaft 47 by its own weight. With the above arrangement, the cleaning member 49 is shifted upward while rotating in accordance with the rotation of the rotary drum 46 in cleaning operation. Therefore, since a wider portion of the cleaning member 49 is used, occurrence of an abrasion section concentrated only on one portion thereof is avoidable. Further, since the cleaning member 49 shifts itself downward to the initial position by its own weight, repeatable use is available. Therefore, in such a cleaning unit, a cleaning member can be used on a wide range of its surface, thereby allowing abrasion to the surface of the cleaning member to occur evenly. Consequently, stable cleaning operation can be obtained even if the number of applications is increased, and life of the cleaning member can be extended. The invention being thus described, it may be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the scope of the invention.

Claims: A magnetic head cleaning system for an apparatus comprising a rotary drum (2) carrying a magnetic head (51) and tape guiding means comprising a tape guiding member (5, 6; 7, 8; 43, 44) and means (15, 16, 20 to 26, 30, 33) for driving the tape guiding member (5, 6; 7, 8; 43, 44) so as to guide a tape (45) between first and second arrangements, the system comprising: cleaning means (11; 38) movable between a first position in which it contacts the rotary drum (2) and a second position in which it does not contact the rotary drum (2), means (13; 40) for biasing the cleaning means (11; 38) to one of the first and second positions, and means for moving the cleaning means (11; 38) against the bias; characterised in that said means for moving comprises the means (15, 16, 20 to 26; 30, 33) for driving the tape guiding member (5, 6; 7, 8; 43, 44). A system as claimed in claim 1, characterised in that the cleaning means (11; 38) is mounted on a pivotable cleaning member (9; 35), the means (13; 40) for biasing acts on the cleaning member (9; 35) and the means (15, 16, 20 to 26; 30, 33) for driving includes a pivotable drive member (16; 33) coupled to the tape guiding member (5, 6; 7, 8; 43, 44) and arranged to move the cleaning means (11; 38) against the bias by contacting the cleaning member (9; 35). A system as claimed in claim 2, wherein the means for biasing is a spring (13; 40) connected to the cleaning member (9; 35). A system as claimed in claim 2 or claim 3, characterised in that the drive member (16; 33) includes a pressing portion (19; 33a) arranged to contact pivoting means (9c; 36) provided on the cleaning member (9, 35) so as to move the cleaning means (11; 38) against the bias. A system as claimed in claim 4, characterised in that the means (13) for biasing is arranged to bias the cleaning means (11) to said first position, the pressing portion (19) is arranged to position the cleaning means (11) in said second position when the tape (45) is in said first arrangement and the tape guiding member (5, 6; 7, 8) is arranged to contact the cleaning member (9) so as to move the cleaning means (11) to said seccnd position when the tape is guided to the second arrangement. A system as claimed in claim 5, characterised in that the pivoting means comprises a pin (9c) mounted on a protruding portion (9b) of the cleaning member (9) and the cleaning member (9) has a projecting portion (9a) for contacting the tape guiding member (5, 6; 7, 8). A system as claimed in any one of claims 2 to 6, characterised in that the drive member comprises a transmission gear drive lever (16) and the tape guiding means further comprises a cam (15) to which a first end of the drive lever (16) is connected and a transmission gear (20 to 26) to which a second end of the drive lever (16) is connected, the drive lever (16) being arranged to pivot in cooperation with the cam (15) so as to move the tape guiding member (5, 6; 7, 8) so as to contact the cleaning member (9) when the tape is in the second arrangement. A system as claimed in claim 7, mounted on a chassis (1) such that the cam (15), drive lever (16) and transmission gear (20 to 26) are on an opposite surface of the chassis (1) to that on which the cleaning member (9) is mounted and the drive lever (16) is arranged to contact the cleaning member (9) through an aperture (14) in the chassis (1). A system as claimed in claim 4, characterised in that the means (40) for biasing is arranged to bias the cleaning means (38) to said first position, the pressing portion (33a) comprises first and second pressing portions (33c, 33d) each arranged to contact the pivoting means (36) so as to move the cleaning means (38) to said second position and the drive member (33) further includes a cam portion (33b) arranged to contact the pivoting means (36) so as to allow the cleaning means (38) to move to said first position. A system as claimed in claim 9, characterised in that the tape guiding member is a half-load lever (43) having a half-load shaft (44) for engaging the tape (45) and the drive member is a drive lever (33) connected to the half-load lever (43). A method of cleaning a magnetic head (51) in an apparatus comprising a rotary drum (2) carrying a magnetic head (51), tape guiding means comprising a tape guiding member (5, 6; 7, 8; 43, 44) and means (15, 16, 20 to 26; 30, 33) for driving the tape guiding member (5, 6; 7, 8; 43, 44) so as to guide a tape (45) between first and second arrangements and cleaning means (11; 38) movable between a first position in which it contacts the rotary drum (2) and a second position in which it does not contact the rotary drum (2), the cleaning means (11; 38) being biased to one of the first and second positions, the method comprising: moving the cleaning means (11; 38) against the bias, and being characterised in that the step of moving is accomplished by the means (15, 16, 20 to 26; 30, 33) for driving the tape guiding member (5, 6; 7, 8; 43, 44). A method as claimed in claim 11, characterised in that the cleaning means (11; 38) is mounted on a pivotable cleaning member (9; 35) biased so as to bring the cleaning means (11; 38) to said first position and the means (15, 16, 20 to 26; 30, 33) for driving includes a pivotable drive member (16; 33) coupled to the tape guiding member (5, 6; 7, 8; 43, 44) and in that the step of moving comprises: pressing the cleaning member (9; 35) against the bias by the drive member (16; 33). A method as claimed in claim 12, further comprising the steps of: moving the tape guiding member (5, 6; 7, 8) by means of the drive member (16); permitting the cleaning means (11) to move to said first pcsition by releasing the pressure of the drive member (16; 33) on the cleaning member (9); and moving the tape guiding member (5, 6; 7, 8) further so as to contact the cleaning member (9) and bring the cleaning means (11) to said second position. A method as claimed in claim 12, further comprising the steps of: permitting the cleaning member (35) to move against the bias by coming into contact with a cam portion (33b) of the drive member (33) so as to bring the cleaning means (38) to said first position; and pressing the cleaning member (35) by the drive member (33) to bring the cleaning means (38) to said second position.

Inventors: MIMASU KAZUO, SUZUKI NOBUTOSHI, WATANABE KATSUHIKO, MIMASU, KAZUO, SUZUKI, NOBUTOSHI, WATANABE, KATSUHIKO
Applicants: SHARP KK, SHARP KABUSHIKI KAISHA
Application year: 1991
Main classification: G11B5
IPC codes: G11B5