JP4239865B2 - Recording / playback device - Google Patents

Description

  The present invention relates to a recording / reproducing apparatus for recording and reproducing data on a detachable tape-like magnetic recording medium.

  In a magnetic recording / reproducing apparatus that helically scans a rotating drum on which a recording / reproducing head is mounted and records / reproduces predetermined data on / from a tape cassette in which a tape-like magnetic recording medium is incorporated, before performing the recording / reproducing operation. When pulling out the tape from the tape cassette and winding the drawn tape around the rotating drum at a predetermined wrap angle, so-called loading is required, and when the tape cassette is removed from the apparatus after performing the recording / reproducing operation. It is necessary to perform an operation of storing the drawn tape in the tape cassette, so-called unloading. Various techniques have been proposed for such loading and unloading methods (see, for example, Patent Document 1).

  For example, a magnetic recording / reproducing apparatus employing a loading system mainly employs a parallel loading system using a tape path as shown in FIG. 5 in order to reduce the size and cost of the apparatus.

  The feature of this system is that inclined guide posts 40a and 41a are provided in the loading guide blocks 40A and 41A on the supply reel 40 and take-up reel 41 side to align the magnetic tape 2 with the inclination of the drum 42, respectively. In the mechanism using this loading system, all the posts other than the inclined guide posts 40a and 41a and the drum 42 are erected vertically.

  The loading operation for pulling out the magnetic tape from the tape cassette is performed for the first time in the reproduction or recording mode in the magnetic recording / reproducing apparatus. The tape path in the tape running state in the playback or recording mode after completion of the loading operation has been strictly examined.

  The unloading operation for storing the magnetic tape 2 in the tape cassette from the completion state of the loading operation is performed, for example, according to the procedure shown in the schematic diagrams of FIGS.

  As shown in FIG. 6, the magnetic tape 2 is in sliding contact with the drum 42 at a predetermined winding angle, so-called wrap angle. The loading mechanism of the magnetic recording / reproducing apparatus is shown in FIG. 7 as a pair of loading blocks 40A, 41A in which inclined guide posts 40a, 41a and loading posts 40b, 41b are erected for each block as unloading starts. In this way, the supply reel 40 and the take-up reel 41 are gradually separated from the drum 42 so as to be parallel to the line connecting the axes of the supply reel 40 and the take-up reel 41.

  Further, when this unloading operation proceeds, the wrap angle between the magnetic tape 2 and the drum 42 is further reduced in the loading mechanism (see FIG. 8), and finally the magnetic tape 2 is completely separated from the drum 42 (see FIG. 9).

  In the fast-forward mode or rewind mode other than the playback or recording mode by this method, the tape is run after performing the unloading operation from the loading completion state to return to the state before the loading. It is possible to make the tape run at high speed, which is advantageous.

JP-A-8-96454

  By the way, in the magnetic recording / reproducing apparatus, when loading and unloading are performed, the tape surface is damaged by sliding contact with the rotating drum. Therefore, in order to reduce damage on the tape surface during loading and unloading, the rotating drum is rotated so as to form an air film (air layer) of several μm to several mm between the rotating drum and the tape. Yes.

  However, since the tape path during loading does not necessarily depict an ideal path, for example, when the tape twists during loading, the head passes beyond the air film in which the twisted portion is formed. There is a problem that the surface of the tape is damaged and the tape is cut.

  Accordingly, an object of the present invention is to provide a recording / reproducing apparatus that suppresses damage to the surface of a tape and safely loads and unloads in order to solve the above-described problems.

In order to solve the above-described problem, the recording / reproducing apparatus according to the present invention has a plurality of tape cassettes that are configured such that the magnetic tape is wound from the supply reel to the take-up reel. Magnetic tape winding means for pulling out the magnetic tape from the tape cassette by the drawing post and winding the drawn magnetic tape around a drum on which a recording or reproducing head is mounted according to a predetermined tape path, and the drum in a predetermined direction The magnetic tape is separated from the drum according to a predetermined tape path and stored in the tape cassette from the state where the magnetic tape is wound around the drum by the magnetic tape winding means and the drive control means for driving and controlling to rotate at the speed Magnetic tape storage means, and a magnetic tape storage means from the drum by the magnetic tape storage means. Diameter calculating means for calculating the winding diameter of the magnetic tape wound around the supply-side reel and the winding diameter of the magnetic tape wound around the winding-side reel when the tape is isolated and stored in the tape cassette Writing means for writing information on the winding diameter calculated by the winding diameter calculation means into a memory built in the tape cassette, reading means for reading the winding diameter information from the memory when the tape cassette is mounted, Based on the winding diameter information read by the reading means, the first torque applied to the supply-side reel and the second torque applied to the take-up reel so that the magnetic tape is wound around the drum with a predetermined tension value. comprising a calculation for torque calculation unit, a supply reel driving means for rotationally driving the supply reel and the take-up reel driving means for rotationally driving the take-up reel, the drive control means, The air tape winding means when winding the magnetic tape on the drum, terminates the driving of the drum, the supply reel driving means and the take-up reel driving means, the drum driving control by the drive control means is released When the magnetic tape is wound by the magnetic tape winding means according to a predetermined tape path, the supply-side reel is driven to rotate based on the first torque calculated by the torque calculating means, and is calculated by the torque calculating means. The take-up reel is driven to rotate based on the second torque .

  Since the recording / reproducing apparatus according to the present invention releases the driving of the drum 3 during the loading operation and the unloading operation, tape damage due to sliding of the magnetic tape and the drum due to the loading operation and the unloading operation hardly occurs. Also, when unloading, the reel diameter information of the supply side reel and the take-up reel is written into the memory built in the tape cassette, and during the loading operation, the reel diameter information is read from the memory and supplied according to the reel diameter information. Since the torque applied to the side reel and the take-up side reel is calculated, the magnetic tape can be loaded onto the drum 3 with the optimum tension.

  Therefore, the recording / reproducing apparatus according to the present invention can suppress tape damage during the loading operation and the unloading operation, can prevent the tape from being cut, and the rotating head mounted on the drum can be used as a magnetic tape. Damage caused by sliding with can be reduced.

  Hereinafter, as an embodiment of the present invention, a recording / reproducing apparatus in which a tape cassette incorporating a magnetic tape is mounted, a magnetic tape is drawn from the tape cassette, and predetermined data is recorded and reproduced on the drawn magnetic tape will be described. To do. Note that the recording / reproducing apparatus in the present embodiment is applied to an 8 mm VTR having a loading mechanism of a so-called M loading system, which is applied in order to reduce the size and cost of the apparatus. The magnetic tape used in the present embodiment is made of a thin film material having metallic cobalt applied to the surface.

  As shown in FIG. 1, the recording / reproducing apparatus 1 includes a fixed chassis 20 and a movable chassis 11 disposed on the fixed chassis 20. The moving chassis 11 is made of a metal plate such as a stainless steel plate. The movable chassis 11 is reinforced with a plurality of ribs 12 whose peripheral portions are integrally bent and processed into a highly accurate horizontal flat plate. A pair of left and right reel tables including a supply reel table 13a and a take-up reel table 13b are rotatably attached to the upper part of the rear end side of the movable chassis 11.

  Further, the movable chassis 11 is provided with four long and thin guide holes 14 extending in the front / rear direction in the direction in which the tape cassette is inserted / ejected from the recording / reproducing apparatus 1 at four positions, front / rear / left / right. Has been. In addition, a pair of left and right tape cassette positioning pins 15 and 15 and a tape cassette mounting table 16 and 16 are attached to the upper portion of the movable chassis 11.

  The pair of left and right reel tables 3a and 3b, the tape cassette positioning pins 15 and 15, and the tape cassette mounting table 16 and 16 are arranged in a tape cassette mounting portion 17 on the movable chassis 11 surrounded by a one-dot chain line in FIG. Yes.

  A pair of guide rails 18 a and 18 b for guiding the magnetic tape drawn from the tape cassette are horizontally provided on the front end side of the moving chassis 11. Both the guide rails 18a and 18b are formed by outsert-molding the synthetic resin such as polyacetal resin on the movable chassis 11 made of a metal plate such as a stainless steel plate. These guide rails 18a and 18b are respectively provided with guide grooves 19 and 19 which are appropriately curved along the central portion thereof. The tips 19a and 19b of the guide grooves 19 and 19 are open.

  The fixed chassis 20 is made of a metal plate such as an aluminum plate. A drum 3 on which a rotary head is disposed is attached to an upper portion on the front end side of the fixed chassis 20 via a drum base (not shown) made of metal such as aluminum.

  For example, the drum 3 is configured such that the upper drum rotates, and the lower drum is fixedly disposed on the drum base. For example, the drum 3 is attached to the fixed chassis 20 so as to be inclined by an angle θ with respect to a line based on the horizontal arrow A, that is, in the direction of the arrow B (FIG. 1). When the drum 3 has a diameter of 40 mm and the drum 3 has a lid angle of 4.885 °, the inclination angle θ is set to 4 °. The tilt angle θ is an example and is not limited to this.

  Guide pins 21 are fixed to the upper portion of the fixed chassis 20 at four locations, front, rear, left and right. These four guide pins 21 penetrate the guide holes 5 of the movable chassis 11, and the upper ends of the guide pins 21 are engaged with the tape cassette mounting portion 17. As a result, in the tape loading mechanism, the movable chassis 11 is freely moved horizontally in the front-rear direction of the mechanism indicated by the arrow a as the tape cassette is attached or detached.

  In addition, the guide groove 19 is provided with inclined guide blocks 22 and 23 in which a plurality of drawer posts that move while sliding in contact with the magnetic tape 2 from within the tape cassette mounted along the groove are provided. In the inclined guide blocks 22 and 23, rotation guides 22a and 23a each having a rotation roller as a plurality of drawer posts and inclined guide posts 1a and 1b in which fixing pins are inclined are provided in pairs in the respective blocks. Yes.

  The inclined guide blocks 22 and 23 engage the guide rails 18a and 18b with the sliding portions, and slide along the guide grooves 19 and 19 by supplying driving force. The inclined guide blocks 22 and 23 slide on the guide rails 18a and 18b while slidingly contacting the magnetic tape 2 during loading for pulling out the magnetic tape 2 and unloading for storing the magnetic tape 2.

  For example, the inclined guide blocks 22 in the inclined guide blocks 22 and 23 that move in parallel during the loading operation come into contact with the tension detection pin 24 disposed on the guide groove 19. The tension detection pin 24 is erected on the tension arm 25. The tension arm 25 rotates about a rotation shaft 26 so as to be rotatable. The tension arm 25 is rotated in a direction to be removed from the guide groove 19 by the contact between the tension detection pin 24 and the guide block 22. Although not shown, the tension arm 25 is urged in a direction in which the tension arm 25 is brought into contact with the magnetic tape 2 by an urging force of, for example, a tension coil spring.

  Further, the arms 31 and 32 can be freely rotated around the rotation shafts 29 and 30 by the driving force supplied by the tape drawing pin 27 and the pinch roller 28 disposed on the take-up reel side in accordance with the loading operation. It is attached like.

  The magnetic tape 2 is pulled out so as to be wound around the drum 3 while performing the loading operation. An impedance roller 33 is disposed on one side of the drum 3 to stably run the magnetic tape 2, and a capstan 34 is disposed on the other side.

  When the magnetic tape 2 is wound around the drum 3 at a predetermined wrap angle and the loading operation is completed, the inclined guide blocks 22 and 23 are stopped so that a pair is placed on both sides of the drum base on which the drum 3 is disposed. The guide positioning bases 35 and 36 are disposed.

  The guide positioning bases 35 and 36 are formed with guide grooves 37 and 38 which are connected as a result of loading operation from the tips 19a and 19b of the both guide grooves 19 and 19, respectively. End portions 37a and 38a into which the inclined guide blocks 22 and 23 of the guide grooves 37 and 38 are inserted are also opened like the tips 19a and 19b of the both guide grooves 19 and 19, respectively. When reaching the ends of both guide grooves 37 and 38, the loading operation for winding the magnetic tape 2 is completed.

  Further, as shown in FIG. 2, the recording / reproducing apparatus 1 drives an insertion / ejection detection unit 40 that detects insertion / ejection of the tape cassette, the inclined guide blocks 22, 23, the tape extraction pin 27, and the pinch roller 28. A loading / unloading unit 41 that performs a loading operation of the magnetic tape 2 and an unloading operation for storing the loaded magnetic tape 2 in a tape cassette, and the drum 3 is rotated in a predetermined direction at a predetermined speed. A drive control unit 42 for driving control, a winding diameter information calculation unit 43 for detecting the moving distance of the magnetic tape 2 from the number of rotations of the pinch roller 28 and calculating the winding diameter of the supply side reel and the take-up side reel, and a tape cassette A writing / reading unit for writing the winding diameter information into the memory 44 built in the memory and reading the written winding diameter information from the memory 44 5, a torque calculation unit 46 that calculates a torque applied to the supply-side reel based on the winding diameter information and calculates a torque applied to the take-up reel, and a supply-side reel drive unit 47 that rotates the supply-side reel A winding side drive unit 48 for rotating the winding side reel, and a tension detection unit 49 for detecting the tension of the magnetic tape 2 laid between the tension detection pin 24 and the inclined guide block 22 are provided. The memory 44 includes information other than the winding diameter information (for example, index information of recorded data). The writing / reading unit 45 and the memory 44 may be configured to write and read information by contacting each other, or may be configured to write and read information without contact. good.

  The insertion / ejection detection unit 40 is connected to a loading / unloading unit 41, a drive control unit 42, a writing / reading unit 45, and a torque calculation unit 46. The insertion / ejection detection unit 40 generates a predetermined signal S1 when detecting insertion of the tape cassette, and supplies the signal S1 to the loading / unloading unit 41, the drive control unit 42, and the writing / reading unit 45. To do. When the insertion / ejection detection unit 40 detects a signal indicating that the tape cassette is to be ejected, the insertion / ejection detection unit 40 generates a predetermined signal S2, and the loading / unloading unit 41 and the winding diameter information calculation unit 43 generate the signal S2. To supply.

  The loading / unloading unit 41 drives the inclined guide blocks 22 and 23, the tape drawing pin 27, and the pinch roller 28 according to the signal S1 supplied from the insertion / ejection detection unit 40, and follows a predetermined tape path. The loading operation of the magnetic tape 2 is started.

  The drive control unit 42 releases the drive control of the drum 3 according to the signal S1 supplied from the insertion / ejection detection unit 40. The drum 3 is in a free state (unlocked state) when the drive control by the drive control unit 42 is released.

  The winding diameter information calculation unit 43 detects the number of rotations of the capstan motor 34, and calculates the winding diameter of the supply-side reel and the winding diameter of the winding-side reel based on the detected value. The winding diameter information calculation unit 43 outputs the winding diameter information to the writing / reading unit 45 in response to the signal S2 supplied from the insertion / ejection detection unit 40.

  The writing / reading unit 45 writes the winding diameter information supplied from the winding diameter information calculation unit 43 in the memory 44 built in the tape cassette. The writing / reading unit 45 reads the winding diameter information from the memory 44 built in the tape cassette in response to the signal S1 supplied from the insertion / ejection detection unit 40, and uses the winding diameter information as the torque calculation unit. 46.

  The tension detection unit 49 detects the tension applied to the tension detection pin 24 and supplies the tension value to the torque calculation unit 46.

  Based on the winding diameter information supplied from the writing / reading unit 45 and the tension value supplied from the tension detection unit 49, the torque calculation unit 46 causes the magnetic tape 2 to be wound around the drum 3 with a predetermined tension value. In addition, a first torque applied to the supply reel and a second torque applied to the take-up reel are calculated, the first torque is supplied to the supply reel drive unit 47, and the second torque is taken up. It is supplied to the side reel drive unit 48.

    The supply-side reel drive unit 47 performs drive control such that the supply-side reel is driven in the clockwise direction, for example, according to the first torque supplied from the torque calculation unit 46.

  The take-up reel drive unit 48 performs drive control so that the take-up reel is driven in the counterclockwise direction, for example, according to the second torque supplied from the torque calculation unit 46.

  The tension detection unit 49 detects the tension value again so that the tension value of the magnetic tape 2 placed between the tape drawing pin 27 and the inclined guide block 22 becomes the optimum value, and the tension value is calculated by the torque calculation unit 46. May be supplied.

  Here, the loading operation by the recording / reproducing apparatus 1 will be described with reference to the flowchart shown in FIG.

  In step ST1, when detecting insertion of the tape cassette, the insertion / ejection detection unit 40 generates a predetermined signal S1, and the signal S1 is written / read unit 45, loading / unloading unit 41, and drive control. Supplied to the unit 42.

  In step ST2, the writing / reading unit 45 checks whether or not there is winding diameter information in the memory 44 built in the tape cassette. If there is winding diameter information in the memory 44, the process proceeds to step ST3, and if there is no winding diameter information in the memory 44, the process proceeds to step ST6.

  In step ST <b> 3, the writing / reading unit 45 reads the winding diameter information from the memory 44 and supplies the winding diameter information to the torque calculation unit 46.

  In step ST4, the torque calculation unit 46 applies the first reel to the supply-side reel so that the magnetic tape 2 is wound around the drum 3 with a predetermined tension value based on the winding diameter information supplied from the writing / reading unit 45. And the second torque applied to the take-up reel, the first torque is supplied to the supply-side reel drive unit 47, and the second torque is supplied to the take-up reel drive unit 48. For example, the torque calculation unit 46 calculates the first torque so that a tension of about 5 gf is applied to the supply-side reel, and also applies the second torque so that a tension of about 0.2 gf is applied to the winding-side reel. calculate.

  In step ST5, the loading / unloading unit 41 drives the inclined guide blocks 22 and 23, the tape drawing pin 27, and the pinch roller 28, and the magnetic force applied with the predetermined tension along the predetermined tape path by step ST3. The loading operation of the tape 2 is performed.

  In step ST6, the loading / unloading unit 41 drives the inclined guide blocks 22 and 23, the tape drawing pin 27, and the pinch roller 28, and performs a normal loading operation according to a predetermined tape path. In the normal loading operation, the drive of the take-up reel is locked while the drum 3 is driven at a predetermined rotation speed, and the tension of the magnetic tape 2 wound around the drum 3 is adjusted by the drive of the supply-side reel. Is the action.

  Further, the drive control unit 42 cancels the drive control of the drum 3 in accordance with the signal S1 supplied from the insertion / ejection detection unit 40. Accordingly, the drum 3 is in a free state, and when the magnetic tape 2 is loaded by the loading / unloading unit 41, the drum 3 is pulled by the magnetic tape 2 and slightly driven in a predetermined direction. Therefore, the magnetic tape 2 is hardly damaged by sliding with the drum 3 in the loading operation.

  The tension detection unit 49 detects the tension value of the magnetic tape 2 laid between the tape drawing pin 27 and the inclined guide block 22 when the magnetic tape 2 is loaded onto the drum 3, and calculates the torque of the tension value. To the unit 46. The torque calculator 46 adjusts the amount of torque applied to the take-up reel to the supply reel based on the tension value supplied from the tension detector 49.

  Next, the unloading operation by the recording / reproducing apparatus 1 will be described with reference to the flowchart shown in FIG.

  In step ST <b> 10, when the insertion / ejection detection unit 40 detects a signal indicating that the tape cassette is ejected, the insertion / ejection detection unit 40 generates a predetermined signal S <b> 2 and supplies the signal S <b> 2 to the winding diameter information calculation unit 43. The insertion / ejection detection unit 40 may generate a signal indicating that the tape cassette is ejected when the user presses the eject button, and may generate the signal S2 in response to the signal.

  In step ST11, the winding diameter information calculation unit 43 calculates the winding diameter information of the supply-side reel and the winding diameter information of the winding-side reel in accordance with the signal S2 supplied from the insertion / ejection detection unit 40. The reel diameter information is supplied to the writing / reading unit 45.

  In step ST12, the writing / reading unit 45 writes the winding diameter information supplied from the winding diameter information calculation unit 43 in the memory 44 built in the tape cassette.

  In step ST13, the loading / unloading unit 41 drives the inclined guide blocks 22, 23, the tape drawing pin 27, and the pinch roller 28, and starts an unloading operation of the magnetic tape 2 along a predetermined tape path.

  Further, the drive control unit 42 releases the drive control of the drum 3 according to the signal S2 supplied from the insertion / ejection detection unit 40. Therefore, the drum 3 is in a free state, and when the magnetic tape 2 is unloaded by the loading / unloading unit 41, the drum 3 is pulled by the magnetic tape 2 and slightly driven in a predetermined direction. Therefore, the magnetic tape 2 is hardly damaged by sliding with the drum 3 in the unloading operation.

  When the unloading operation is performed, the supply-side reel drive unit 47 controls the supply-side reel in a predetermined direction (for example, counterclockwise), and the take-up reel drive unit 48 controls the take-up reel drive unit 48. Lock control is performed so that the side reel is not driven.

  Thus, since the recording / reproducing apparatus 1 releases the driving of the drum 3 during the loading operation and the unloading operation, the tape damage due to the sliding of the magnetic tape 2 and the drum 3 due to the loading operation and the unloading operation is almost none. In addition, when unloading, the reel diameter information of the supply reel and the take-up reel is written in the memory 44 built in the tape cassette, and when the loading operation is performed, the reel diameter information is read from the memory 44 and the reel diameter is read. Since the torque applied to the supply reel and the take-up reel is calculated according to the information, the magnetic tape 2 can be loaded onto the drum 3 with an optimum tension.

  Therefore, the recording / reproducing apparatus 1 according to the present invention can suppress the tape damage during the loading operation and the unloading operation, can prevent the tape from being cut, and the rotating head mounted on the drum can be magnetically connected. Damage caused by sliding with the tape can be reduced.

It is a figure which shows the principal part of the recording / reproducing apparatus which concerns on this invention. It is a block diagram for demonstrating the loading and unloading performed by the recording / reproducing apparatus based on this invention. It is a flowchart explaining the control at the time of loading operation performed by the recording / reproducing apparatus which concerns on this invention. It is a flowchart explaining the control at the time of the unloading operation | movement performed by the recording / reproducing apparatus which concerns on this invention. It is a figure which shows the tape path | pass at the time of the completion of loading of a parallel loading system. It is a figure which shows the tape path | pass at the time of the unloading start by a parallel loading system. It is a figure which shows the tape path | pass in the process in the middle of unloading operation. FIG. 10 is a diagram illustrating a tape path in a state where an unloading operation has advanced. It is a figure which shows the tape path | pass of the last condition where a drum and a magnetic tape contact in the process of unloading operation.

Explanation of symbols

  2 Magnetic Tape, 22, 23 Inclined Guide Block, 24 Tension Detection Pin, 27 Tape Pullout Pin, 28 Pinch Roller, 40 Insertion / Ejection Detection Unit, 41 Loading / Unloading Unit, 42 Drive Control Unit, 43 Winding Diameter Information Calculation Unit , 44 Memory, 45 Write / read unit, 46 Torque calculation unit, 47 Supply side reel drive unit, 48 Winding side drive unit, 49 Tension detection unit

Claims (1)

The magnetic tape is drawn out and pulled out from the tape cassette by a plurality of pull-out posts when a tape cassette configured so that the magnetic tape is wound from the supply reel to the take-up reel is loaded. A magnetic tape winding means for winding a recording or reproducing head mounted on a drum according to a predetermined tape path;
Drive control means for driving and controlling the drum to rotate in a predetermined direction at a predetermined speed ;
Magnetic tape storage means for storing the magnetic tape in the tape cassette by separating the magnetic tape from the drum according to a predetermined tape path from a state in which the magnetic tape is wound around the drum by the magnetic tape winding means;
When the magnetic tape is separated from the drum by the magnetic tape storage means and stored in the tape cassette, the winding diameter of the magnetic tape wound around the supply-side reel and the winding around the take-up reel A winding diameter calculating means for calculating the winding diameter of the magnetic tape being used;
Writing means for writing information on the winding diameter calculated by the winding diameter calculating means into a memory built in the tape cassette;
Read means for reading the winding diameter information from the memory when the tape cassette is mounted;
Based on the winding diameter information read by the reading means, the first torque applied to the supply reel and the winding reel are applied so that the magnetic tape is wound around the drum with a predetermined tension value. Torque calculating means for calculating a second torque;
Supply-side reel driving means for rotating the supply-side reel;
Winding-side reel drive means for rotationally driving the winding-side reel ,
The drive control means cancels the drive control to the drum when the magnetic tape is wound around the drum by the magnetic tape winding means ,
The supply-side reel drive means and the take-up reel drive means wind the magnetic tape by the magnetic tape winding means according to a predetermined tape path on a drum whose drive control by the drive control means is released. In this case, the supply-side reel is driven to rotate based on the first torque calculated by the torque calculation means, and the take-up reel is rotated based on the second torque calculated by the torque calculation means. A recording / reproducing device to be driven .

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