JPH0212683A - magnetic recording and playback device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording and reproducing device for recording on endless magnetic tape, such as a recording device for an answering machine or a recording device for a learning machine.

Conventional Technology This type of technology involves winding a wide, endless magnetic tape around a pair of rollers, including a pinch roller, which is constantly connected to a motor built into a recording/playback device, and then driving the motor to wind the magnetic tape into a specified position. Information is recorded or reproduced on the magnetic tape by scanning the magnetic head in the width direction of the magnetic tape during the process of rotating the tape several times.

Problems to be Solved by the Invention This type of device uses a wide magnetic tape, so a large amount of information can be recorded relative to the length of the magnetic tape, but the power transmission mechanism connected to the motor The endless magnetic tape cannot be removed from the pinch roller unless the pinch roller is removed. That is, since it is virtually impossible for the user to replace the magnetic tape, there is a problem in that the information that can be recorded on the magnetic tape is limited and its uses are restricted.

Means for Solving the Problems The first invention includes a head running drive unit that drives a magnetic head along the width direction of a wide and endless magnetic tape, and a head running drive unit that is connected to a motor and protrudes from both sides of the magnetic tape. A recording/playback device having a capstan having a predetermined length is provided, a flat cassette case is provided which is detachably attached to the recording/playback device, and a pinch is set to a length that protrudes from both sides of the magnetic tape. The magnetic tape is wound around a pair of rollers including a roller, and these rollers are rotatably mounted on the cassette case, and an opening for bringing the capstan and the pinch roller into contact with one surface of the cassette case, and the magnetic head. The feature is that an opening is formed along the movement trajectory of.

The second invention is characterized in that the cassette case has a space formed around the pinch roller that is wider than the slack of the magnetic tape.

A third invention is characterized in that an antistatic layer facing the magnetic tape is formed on the inner surface of the cassette case.

The fourth invention is that a detection surface having a different reflectance from other parts is formed in a part of the magnetic tape, and an opening is formed in the cassette case to make the detection surface face the photoelectric detector of the recording/playback device. It is characterized by

A fifth invention is characterized in that a lid for opening and closing the opening is slidably attached to the cassette case.

A sixth aspect of the present invention is characterized in that an auxiliary roller is rotatably provided in the cassette case to support the magnetic tape at a position facing the pinch roller with a space for positioning the magnetic head.

The seventh invention is characterized in that a pad holder having a soft pad along the width direction of the inner surface of the magnetic tape is biased toward the magnetic head side and is displaceably attached to the cassette case.

A fourth invention is characterized in that the cassette case is provided with a plurality of springs that bias both sides of the pad holder toward the magnetic head.

A ninth invention is characterized in that the pad holder is integrally formed with a pressing surface that presses the magnetic tape against the inner surface of the cassette case when the pad holder is displaced by its biasing force.

The invention of the strategist is: - A split case with both openings and another split case covering the opening surface of the split case are combined to form a cassette case, and the shafts at both ends of the pinch roller are sandwiched between the pair of split cases. The present invention is characterized in that bearings are provided to rotatably support the cassette case, and flanges that abut the inner surface of the cassette case are integrally formed on these bearings.

The invention of Strategist is characterized by integrally forming a protruding part that is guided by the guide part of the recording/reproducing device on the detail of the pinch roller or on the bearing that supports this shaft part so as to protrude from both sides of the cassette case. do.

In the first invention, when the cassette case is attached to the recording/playback device, the outer periphery of the pinch roller and the capstan are brought into contact, the magnetic tape is brought into contact with the magnetic head, and the capstan is rotated by the motor. is transmitted to the pinch roller by friction to rotate the magnetic tape, and the magnetic head is driven by the travel drive unit to scan the magnetic tape in the width direction, thereby recording or reproducing data.

In the second invention, when the magnetic tape is driven by the pinch roller and overruns the outer periphery of the pinch roller, the situation in which the magnetic tape comes into contact with the inner surface of the cassette case is avoided, and the running resistance of the magnetic tape increases and the magnetic tape Injuries are avoided.

In the third invention, problems caused by static electricity being charged on the magnetic tape are avoided.

In the fourth invention, since the detection surface is detected by the photoelectric detector every time the magnetic tape rotates once, it is possible to control the tracking operation of the head running drive unit based on this detection signal.

In the fifth aspect of the invention, when the cassette case is removed from the recording/playback device and is not in use, the opening of the cassette case is closed by the lid to protect the magnetic tape.

In the sixth invention, since the tension of the magnetic tape between the pinch roller and the auxiliary roller is increased, the magnetic tape is brought into close contact with the magnetic head.

In the seventh invention, the magnetic tape is forcibly brought into close contact with the magnetic head by the pad.

In the fourth aspect of the invention, the pressure force of the magnetic tape against the magnetic head is maintained constant no matter where the magnetic head comes into contact with any part of the magnetic tape in the width direction.

In the ninth invention, when the cassette case is removed from the recording/playback device and is not in use, the magnetic tape is pressed and fixed to the inner surface of the cassette case by the suppressing surface of the pad holder, so it is rubbed against the inner surface of the cassette case and scratched. This avoids the phenomenon of .

In Tatsushi's invention, the pinch roller is supported by bearings, which reduces the load and prevents slipping between the pinch roller and the capstan. Furthermore, the flange of the bearing is brought into contact with the inner surface of the cassette case to restrict movement in the axial direction, and the bearing is also clamped between the pair of split cases, thereby simplifying the assembly structure of the bearing.

In the invention of Takushi, it becomes possible to position the cassette case with respect to the recording/playback device using the shaft portion or bearing of the pinch roller.

Example An embodiment of this invention will be described based on the drawings.

First, the structure of the recording/playback device 1 is shown in FIGS. 1 and 7.

Reference numeral 2 denotes a magnetic head, and this magnetic head 2 is held by a carrier 4 that is slidably fitted onto a carrier shaft 3. A feed screw 5 is screwed onto the carrier 4 with regulated movement in the axial direction, a gear 6 is fixed to the end of the feed screw 5, and a gear 6 is directly connected to the carrier motor 8 and meshed with the gear 6. A head traveling drive section 9 is formed by the gear 7. Further, a capstan 1o parallel to the carrier shaft 3 is rotatably provided, and this capstan 10
A belt 15 is wound around a pulley 12 connected to the motor 12 via a shaft 11, and a pulley 14 directly connected to a motor 13. Furthermore, a reflective photoelectric detector 16 is provided in the recording/reproducing device 1 .

Next, the structure of the cassette tape 17 will be explained.

18 is a flat cassette case, this cassette case 1
Reference numeral 8 is formed by combining a bottom case 19 and an upper case 20, each of which is a split case, with their opening surfaces aligned, and the bottom case 19 has an opening 21 along the movement trajectory of the magnetic head 2. , said capstan 1
An opening 22 through which 0 protrudes and an opening 23 facing the photoelectric detector 16 are formed. The cassette case 18 also houses a magnetic tape 26 wound around a pinch roller 24 and another roller 25, and rotates around an auxiliary roller 27 formed of a pipe and a support shaft 28. A pad holder 29 is provided. This pad holder 29 holds the magnetic tape 26 in the bottom case 1.
a horizontally long pressing surface 30 that presses against the inner surface of the magnetic head 2;
It has a laterally long and soft pad 31 facing the .

Further, an antistatic layer 32 is formed on the inner surfaces of the bottom case 19 and the upper case 20 by pasting an antistatic sheet or applying an antistatic agent. Further, a lid 34 having a window 33 corresponding to the opening 23 and opening and closing the opening 21.22 is slidably fitted into the cassette case 18. Furthermore, cassette case 18
A space 35 wider than the slack of the magnetic tape 26 is formed around the pinch roller 24. In other words, if all parts of the magnetic tape 26 are tensioned, the load on the rotating system will be high, so it is expected that there will be some slack in the length of the magnetic tape 26, as shown in FIG. Thus, it is desirable to maintain tension between the roller 25, the auxiliary roller 27, the magnetic head 2, and the pinch roller 24. Therefore, when the pinch roller 24 is driven counterclockwise, the magnetic tape 26 overruns to the outside of the pinch roller 24 with a slack of a.
A space 35 is formed between the outer periphery of the cassette case 4 and the inner surface of the cassette case 18 with a gap wider than a. Furthermore, the support shaft 28 of the pad holder 29 is attached to the upper case 20.
A protruding piece 36 that presses the pad holder 29 and the auxiliary roller 27 is integrally formed, and both sides of the pad holder 29 are urged toward the bottom case 19 by a spring 37.

Figure 2 shows the cassette tape 1 with the upper case 20 removed.
7 is a plan view showing the inside of the pad holder 29.
Projecting pieces 38 are formed protrudingly on both sides of 0, and these projecting pieces 3
The spring 37 is compressed between the upper case 8 and the inner surface of the upper case 20. In addition, the pinch roller 24
The bearing 40 rotatably supports the shaft portion 39 at both ends of the
A flange 41 that contacts the inner surfaces of the bottom case I9 and the upper case 20, and a protrusion 42 that protrudes to the outside of the bottom case 19 and the upper case 20 are integrally formed. Therefore, the movement of these bearings 40 in the axial direction is restricted by the contact between the inner surface of the cassette case 18 and the flange 41, and the bearings 40 are fitted into the U-shaped groove 44 formed in the bottom case 19 and The upper case 20 prevents the upper case from floating. Further, the ribs 45 on both the left and right sides formed on the bottom case 19 have shaft portions 46 that protrude from both ends of the roller 25.
U-shaped groove 47 that rotatably holds the auxiliary roller 2
7 and a U-shaped groove 48 for rotatably holding the support shaft 28 of the pad holder 29 are formed. Also,
The shaft portion 46, the auxiliary roller 27, and the support shaft 28 are prevented from floating out of the grooves 47, 48 by the upper case 20. Furthermore, as shown in Figure 2, in a pinch
The capstan 10 and the capstan 10 are set to have a length that protrudes from both sides of the magnetic tape 26, and rotational force is transmitted between the capstan 10 and the capstan 10 through friction at the contact portions on both sides of the magnetic tape 26. Furthermore, a detection surface 49 having a higher reflectance than other parts is formed on a part of the outer surface of the magnetic tape 26 by pasting a reflective tape or the like. Incidentally, when the cassette case 18 is attached to the recording/reproducing device 1, the protruding portion 42 of the bearing 40 is fitted into a guide portion 43 provided on the recording/reproducing device 1 and positioned.

FIG. 3 shows the state in which the cassette tape 17 is removed from the recording/playback device 1, and the opening 2 is opened by sliding the lid 34.
1.22 is closed by a lid 34. Also, the pressing surface 30 of the pad holder 29 rotates by the force of the spring 37.
As a result, the magnetic tape 26 is pressed against the inner surface of the bottom case 19.

FIG. 4 is a longitudinal sectional front view showing how the lid 34 is attached to the cassette case 18. The lid 34 has a U-shaped cross section, and the edges on both sides slide between the bottom case 19 and the upper case 20. It is held in place so that it can move freely.

Further, FIG. 5 shows openings 21 and 22 of the cassette case 18.
These openings 21.2 are shown in the open state in Figure 6.
2 is shown closed by the lid 34, there are stoppers 50 at both ends of the bottom case 19 that abut against the edges of the lid 34.
．． 51 is formed, and a locking recess 52 located near the stopper 50 and an elongated recess 53 along the sliding direction of the lid 34 are formed on the bottom surface, and the locking recess 52 and the edge of the opening 21 are engaged. A locking portion 54 is formed protruding from the bottom inner surface of the lid 34.

In such a configuration, when not in use, the lid 34 is slid to close the openings 21, 22 as shown in FIG. At this time, one end edge of the lid 34 abuts against the stopper 51, and the locking portion 54 protrudes into the opening 21 and elastically engages with the edge of the opening 21, thereby maintaining the closed state. Therefore, the magnetic tape 26 is protected. Furthermore, when the magnetic tape 26 is not attached to the recording/playback device 1, as described with reference to FIG. There's no way you'll get hurt.

During recording or playback, the lid 34 is slid to open the openings 21 and 22 as shown in FIG. 5, and the window 33 of the lid 34 is aligned with the opening 23 facing the photoelectric detector 16. At this time, the locking part 54 climbs over the edge of the opening 21 and falls into the recess 53, reducing sliding resistance, thereby providing moderation, and the locking part 54 climbs over the gap between the recess 23 and the locking recess 52. A moderation is obtained when engaging the locking recess 52 again, thereby maintaining the lid 34 in the open state.

When the cassette tape 17 is mounted on the recording/playback device 1 in this open state, the protruding portion 42 of the bearing 40 of the pinch roller 24 is positioned and fitted into the guide portion 43 of the recording/playback device 1. The pinch roller 24 is connected to the capstan 10.
The magnetic tape 26 is pressed by the magnetic head 2 protruding from the opening 21 and supported by the pad 31 while being applied with tension between the auxiliary roller 27 and the pinch roller 24. By driving the motor 13, the rotation of the capstan 10 is transmitted to the pinch roller 24 by frictional force. At this time, since the pinch roller 24 is supported by the bearing 40 and rotates smoothly, the load applied to the capstan 10 is small, and a relative slip phenomenon between the capstan 10 and the pinch roller 24 does not occur. , power transmission between the two is performed accurately. On the other hand, by rotating the feed screw 5 in either direction by the carrier motor 8, the carrier 4 is moved along with the magnetic head 2 to the magnetic tape 2.
6 in the width direction, and in this process information is recorded or played back. As described above, when the magnetic tape 26 is rotated, the photoelectric detector 16 detects the detection surface 49 at every rotation, and this detection signal controls the rotational movement of the carrier motor 8 to perform the tracking operation of the magnetic head 2. It is possible to correct, etc. Furthermore, since both sides of the pad holder 29 holding the pad 31 are biased toward the magnetic head 2 by springs 37, no matter which position the magnetic head 2 is in while it moves in the width direction of the magnetic tape 26,
The magnetic tape 26 can be brought into close contact with the magnetic head 2 with uniform pressing force.

Furthermore, the magnetic tape 26 may overrun the outer side of the pinch roller 24 with an amount of slack a due to the driving force of the pinch roller 24, as shown in FIG.
The formation of the magnetic tape 26 prevents the magnetic tape 26 from being rubbed against the inner surface of the cassette case 18. As a result, the magnetic tape 26 rotates smoothly without receiving running resistance from the inner surface of the cassette case 18, and is not scratched by the cassette case 18.

Furthermore, an antistatic layer 3 is provided on the inner surface of the cassette case 18.
2 is formed, there is no possibility of foreign matter adhering to the magnetic tape 26 due to the generation of static electricity, thereby preventing the magnetic head 2 or the magnetic tape 26 from being scratched. Recording and playback are performed.

When the recording capacity of the magnetic tape 26 reaches a saturated state and it is still necessary to record other information, another cassette tape 17 is loaded into the recording/reproducing machine 1 in place of that cassette tape 17. As a result, -1 recorder/player l
can process more information and expand its uses.

Effects of the Invention As described above, this invention enables recording and playback by mounting a magnetic tape wound around a pair of rollers including a pinch roller in a cassette case having an opening facing the capstan and the magnetic head. When the cassette case is attached to the machine, the pinch roller and capstan are brought into contact and the magnetic tape can be rotated by the contact friction.
Recording or playback can be performed by scanning the magnetic helad in the width direction of the magnetic tape by a traveling drive unit, and therefore,
- The selected cassette case can be easily attached to the recorder/player, and therefore various information can be recorded and stored on different magnetic tapes, thereby expanding the usage. In addition, by forming a space around the pinch roller that is wider than the slack of the magnetic tape, the running resistance of the magnetic tape increases due to contact between the magnetic tape and the inner surface of the cassette case, and the magnetic tape You can avoid getting scratched, and in addition,
By forming an antistatic layer on the inner surface of the cassette case, problems caused by static electricity on the magnetic tape can be avoided.Furthermore, a detection surface is formed on the magnetic tape and this detection surface is photoelectrically detected. By forming an opening in the cassette case that faces the magnetic tape, it is possible to control the tracking operation of the head drive unit based on the detection signal of the photoelectric detector that detects the detection surface every time the magnetic tape rotates once. Furthermore, by providing the cassette case with a lid that opens and closes the opening, it is possible to close the opening of the cassette case and protect the magnetic tape when not in use. By positioning the magnetic head between the pinch roller and the auxiliary roller, the tension of the magnetic tape can be increased between the pinch roller and the auxiliary roller to bring the magnetic tape into close contact with the magnetic head. By biasing the holder toward the magnetic head, the magnetic tape can be forcibly brought into close contact with the magnetic head by the pads.In addition, by biasing both sides of the pad holder with springs, the magnetic tape can be forced into close contact with the magnetic head. The magnetic tape can be brought into contact with the magnetic head with a constant pressure no matter which part of the width of the magnetic tape the head contacts.Furthermore, by forming a pressing surface on the pad holder, the cassette can be easily removed from the recording/playback machine. When the case is removed and not in use, the magnetic tape can be fixed to the inner surface of the cassette case using the suppressing surface, which prevents the magnetic tape from rubbing against the inner surface of the cassette case and causing scratches. , a pair of split cases are joined to form a cassette case, bearings are provided which support the shaft portions at both ends of the pinch roller and are clamped by the split case, and flanges are formed on these bearings to abut against the inner surface of the cassette case. By doing so, it is possible to reduce the load on the rotating part of the pinch roller with the bearing and prevent the occurrence of a slip phenomenon between the pinch roller and the capstan, and the assembly structure of the bearing can be simplified. By forming a protrusion on the shaft or bearing of the pinch roller that is guided by the guide section of the recorder/player, the cassette case can be positioned relative to the recorder/player without using any other parts. have an effect.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Figure 1 is a vertical side view showing a cassette tape installed in a recording/playback machine, and Figure 2 shows the internal structure of the cassette case except for one split case. 3 is a vertical side view showing the state in which the cassette tape is removed from the recording/playback device, FIG. 4 is a vertical front view of the cassette case, and FIG. 5 is a bottom view showing the state in which the opening of the cassette case is opened. Figure 6 is a bottom view showing the opening of the cassette case closed with a lid, Figure 7 is a bottom view showing the state in which the opening of the cassette case is closed with a lid,
The figure is an exploded perspective view showing the relationship between the recording/playback device and the internal mechanism of the cassette tape. ■...Recording/playback device, 2...Magnetic head, 9...Head travel drive unit, 1o...Capstan, 13...
Motor, 16... Photoelectric detector, 18... Cassette case, 19° 20... Split case, 21.22...
Opening, 24...Pinch roller, 25...Roller, 2
6...Magnetic tape, 27...Auxiliary rollers, 2...
- Pad holder, 30... Pressing surface, 31... Pad, 4... Lid, 35... Space, ... Pinch roller shaft, 42... Protrusion, 4 Extrusion surface 2 ...Anti-static layer, 3 7...Spring, 39 0...Bearing, 41...Fla...Guiding part, 49...Test

Claims (1)

[Scope of Claims] 1. A head running drive unit that drives a magnetic head along the width direction of a wide and endless magnetic tape, and a head drive unit that is connected to a motor and has a length that projects from both sides of the magnetic tape. A recording and reproducing device having a capstan is provided, a flat cassette case is provided which is detachably attached to the recording and reproducing device, and a pair of rollers including a pinch roller whose length is set to protrude from both sides of the magnetic tape is provided. The rollers are rotatably mounted on the cassette case by winding the magnetic tape, and an opening for bringing the capstan and the pinch roller into contact with each other and an opening along the movement locus of the magnetic head are formed on one surface of the cassette case. A magnetic recording and playback device characterized by: 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the cassette case has a space formed around the pinch roller that is wider than the slack of the magnetic tape. 3. The magnetic recording and reproducing apparatus according to claim 1, further comprising: an antistatic layer formed on the inner surface of the cassette case to face the magnetic tape. 4. A detection surface having a different reflectance from other parts is formed in a part of the magnetic tape, and an opening is formed in the cassette case so that the detection surface faces the photoelectric detector of the recording/playback device. The magnetic recording and reproducing device according to claim 1. 5. The magnetic recording and reproducing device according to claim 1, wherein a lid for opening and closing the opening is slidably attached to the cassette case. 6. The magnetic recording device according to claim 1, further comprising an auxiliary roller rotatably provided in the cassette case to support the magnetic tape at a position opposite to the pinch roller with a space for positioning the magnetic head. 7. Claim 1, characterized in that a pad holder having a soft pad along the width direction of the inner surface of the magnetic tape is biased toward the magnetic head side and is displaceably attached to the cassette case.
The described magnetic recording and reproducing device. 8. The magnetic recording and reproducing apparatus according to claim 7, wherein the cassette case is provided with a plurality of springs that bias both sides of the pad holder toward the magnetic head. 9. The magnetic recording and reproducing apparatus according to claim 7, wherein the pad holder is integrally formed with a pressing surface that presses the magnetic tape against the inner surface of the cassette case when the pad holder is displaced by its biasing force. 10. A cassette case is formed by combining a split case with an opening on one side and another split case that covers the opening surface of the split case, and is held between the pair of split cases so that the shaft portions at both ends of the pinch roller can be freely rotated. 2. The magnetic recording and reproducing device according to claim 1, further comprising bearings for supporting the cassette case, and flanges that abut the inner surface of the cassette case are integrally formed on these bearings. 11. A claim characterized in that the shaft of the pinch roller or the bearing that supports this shaft is integrally formed with a protrusion that is guided by the guide of the recording/reproducing device and projects from both sides of the cassette case. 10. The magnetic recording and reproducing device according to 10.