JPS5853753Y2 - Twin tape cartridge - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to magnetic tape cartridges.

The two-split case, which is the outer case of a conventional cartridge, contains two endless tapes wound on two reels, each with a winding shaft formed with a reversely tapered truncated cone. Concerning twin tape cartridges that can record and play.

Conventional magnetic tape cartridges house a single endless tape wound on a single reel, biased to one side of the case, allowing recording and playback only at one end, wasting a considerable amount of internal space. However, the friction between the tapes is large, and in order to maintain the strength of the tape due to its considerable thickness, recording and recording for each cartridge is required.
It is difficult to extend the playback time, and if the reel is wound loosely, it often comes off the reel or gets tangled, and especially when used in a vehicle such as a car stereo, the above-mentioned failures due to vibrations often occur. Other drawbacks were that the tape would be creased and the soundtrack would be misaligned with the magnetic head, reducing sound quality.

In order to solve the above-mentioned drawbacks, the present invention incorporates a tape wound on both left and right reels, extends the usage time by playing and recording at both ends, and forms a truncated cone part on the reel winding shaft. In addition to reducing friction when pulling out the tape, there are guide rods on both sides between the left and right reels, a guide piece supported on the top of the guide rod, and a guide piece that loosely fits on the top of the reel winding shaft. The sliding plate acts as a guide when pulling out the tape from three sides, preventing it from coming off the reel, shifting, or getting tangled, and also allows the tape to be made thinner. The purpose is to significantly extend the service life and length of the tape.

In addition, in conventional cartridges, in order to prevent failures such as the tape becoming too loose or tangled, the interior of the case is forced to have complicated partitions and irregularities, which unnecessarily increases the manufacturing cost of the cartridge. was.

Furthermore, due to the fact that the tape is endless, the speed near the winding axis is much slower than at the outer periphery of the reel for a specified tape feed. Due to the friction that constantly occurs in the reel, it has been very difficult to balance the need for loose winding with the need for tight winding to prevent it from coming off the reel or getting tangled. can be completely eliminated.

Hereinafter, other features and effects of the present invention will be explained with reference to the drawings showing the embodiments.The cartridge 10 has a two-split case 11. The pinch roller shaft hole 17 (
The pinch roller shaft hole of the case 11 is tightened into the pinch roller shaft hole (not shown).

According to the above, the case can be molded using the same mold, which simplifies the manufacturing process and reduces costs.

Predetermined windows are provided on both end surfaces 18 and 19 of the cartridge 10, respectively, through which the tape comes into contact with devices necessary for recording and playback, such as a capstan, a magnetic head, and a channel switching device. On the surface of 12, two parallel protrusions 56 and 56 are arranged in parallel, which serve as guides when inserted into the fixed position in the deck, and do not come off the fixed position due to shock or vibration during recording and playback. In order to bring the tape into contact with a head or the like with a constant force, cutouts 57 and 58 for spring contact are formed in the ridge line on one side of each case 11 and 12.

As shown in FIGS. 2 and 3, in the interior 20 of the lower case 12 (and the upper case 11 as well) there are pads 21 and 22 for pressing the tape against the channel switching device and the magnetic head, facing the end face 18. A pinch roller 24 fixed to the pinch roller shaft 24 is provided, and the pinch roller shaft 24 is fixed to the pinch roller shaft 24.
3 has an axial hole 17 formed with a female thread into which the screw 15 is screwed.

Reference numerals 26 and 27 denote a left reel shaft and a right reel shaft that are integrally provided with the case at symmetrical positions, and 28 is a tape guide that is provided as a protrusion approximately facing the pinch roller 24 with the left reel shaft 26 separated. It is a short pillar.

The left and right reel shafts 26 and 27 each have a left reel 2.
9 and a right reel 30 are mounted, and the condomless magnetic tape 25 is drawn out from the winding shaft 44 of the left reel 29 toward the right end of the end face 18, spanning both reels 29 and 30.
It passes in front of the pads 21, 22 and the pinch roller 24, passes through the short column 28, and is wound onto the right reel 30 at its outer periphery.

In addition, a groove 31 is provided in the case 12 and passes through the midpoint of the center connecting line of the left and right reel shafts 26, 27 in the orthogonal force direction.
Guide rods 32 and 33 are attached to both ends of the tape 25 to prevent the tape 25 from protruding from both sides.

Each guide rod 32, 33 has a sleeve 36.3 which can be fixed at any position in the slot 31 by screwing into the screw 34.35 inserted from the surface of the case 12 and from the inside 20 side.
7, and shaft tubes 38 and 39 rotatably fitted into the sleeves 36 and 37.

At the upper ends of these guide tubes 32.33, there is a guide piece 40 that can restrict the tape more lightly than above, and in elongated holes 51.52 provided at both ends of the guide piece 40, nuts 41.42 are inserted.
It is screwed on.

Said guide rods 32, 33 are movable along the slots 31 and are adjusted to correspond to the width a of the tape 25 wound on both reels 29, 30 to prevent the tape from becoming too loose and coming off the reels and getting tangled. Let it be.

The guide piece 40 has an arcuate shape protruding to the left, and is formed with an oblique ■-shaped notch 43 in the center of the protruding side, and the tape 25 pulled out from the left reel winding shaft 44 is inserted into the notch 43. It abuts on one diagonal of the tape, bends it once, and guides it diagonally to the right so that it does not rub against the wound tape.

Therefore, the position and angle of the notch 43 are such that the tape comes out from the winding shaft 44 and the left and right reel winding shafts 44, 46
When the tape is wound and bent out of the central groove, the tape should be at an appropriate position and angle so that it does not come into contact with the tape and is not subject to excessive tension.

Each winding shaft 44 of the left reel 29 and right reel 30 of the present invention
．． As shown in FIG. 4, 46 has an inner truncated cone-shaped central portion 45 with a substantially reverse taper, and a disk portion 54 adjacent to the lower end of the truncated cone portion 45 and whose outer peripheral edge is inclined downward. A disk-shaped base frame plate 48 is formed and is in contact with the lower edge of the disk portion 54.
A large number of tapered ribs 47 protruding from the surface of the base frame board 48 are provided in a radial manner, and the base frame board 48
The outer peripheral edge is also formed to be inclined downward.

The portion of the tape 53 that is in direct contact with the reel winding shaft 44, 46 as described above is usually wound so that its upper and lower edges are in contact with the upper edge of the truncated conical portion 45 and the peripheral edge of the disc portion 54, respectively. However, when the tape 53 is pulled out from the winding shaft 44 in the direction of the notch 43 of the guide piece 40, the lower edge of the tape 53 slides upward on the diagonal periphery of the disc portion 54, and forms the opposite tapered surface of the truncated conical portion 45. As shown by the dotted line 55, the back side of the tape can separate from the adjacent tape, and therefore, when the tape separates from the winding shaft, neither the front nor the front surfaces are subjected to pressure, resulting in less friction, reduced wear, and a longer lifespan. becomes longer.

In addition, the ribs 47 reduce the portion of the tape 25 that comes into direct contact with the base frame 48 during movement, and the outer circumferential slanted surface of the base frame 48 is designed to prevent the tape 25 from becoming too loose and protruding from the base frame 48. Or, when both reels 29 and 30 are being sent from one force to the other, they can be smoothly moved from the periphery into the frame board.

In the present invention, the winding shaft 46 of the other right reel 30 can be freely rotated from above the wound tape 25.
A sliding ring 49 is provided which is fitted into the shaft 46, and its central hole 50 which is fitted with the shaft 46 is formed in the shape of a multi-valve honeycomb.

When the reel 30 is rotating, the sliding ring 49 also rotates at a relatively slow speed while contacting the upper edge of the tape 25,
With respect to the tape 25 being fed at a constant speed, the sliding ring 49 prevents the tape 25 from slipping due to the difference in reel winding speed, in which the change in circumferential speed becomes slower as it approaches the center of the reel. It can be adjusted appropriately to prevent it from being too loose or too tight.

The structure shown in FIGS. 3 and 4 in the interior 20 of the lower case 12 is also present inside the upper case 11 facing downward, and if the lower case 12 is rotated 180 degrees so that the front end becomes the rear end, Case 11 is formed, and both screws 13 and 14 are attached.
The cartridge 10 is formed by overlapping and bonding them together.

After completing the recording or playback of one force on the cartridge 10 of the present invention, in order to insert it and do the same thing with another force tape, the direction shown by the arrow in FIG. This is done by turning it 180 degrees to the other side and replacing it with the end face 19.

With a normal cartridge, there is still a considerable amount of space above the reel, and if it is left upside down, there is a risk that the tape will come undone and become tangled.
The presence of the guide piece 40 and the sliding ring 49 prevents this.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention. Fig. 1 is a three-dimensional view of the external appearance, Fig. 2 is a three-dimensional view of the case when the upper and lower halves are disassembled into upper and lower parts, and Fig. 3 is a three-dimensional view of the upper and lower cases. FIG. 4 is a three-dimensional exploded view showing the configuration and a side view for explaining the reel. 11... Cartridge, 11, 12...
・Case, 13.14... Screw, 15, 16.
...Circular hole, 17...Pinch roller shaft hole,
18.19...Both end faces, 21.22...
・Pad, 24...Pinch roller, 25...
... Tape, 26, 27 ... Reel shaft, 28
...Short pillar, 29,30...Reel, 3
2,33...Guide rod, 34.35...
...Screw, 40...Guide piece, 43...
・■-shaped notch, 44, 46... Winding shaft, 4
5... truncated cone part, 47... rib, 48
...Base frame board, 49 ...Sliding ring, 5
0... Center hole, 53... Tape, 54
・・・・・・Disc part.

Claims (1)

[Scope of utility model registration request] 1. The case has an upper and lower halves that have the same eldest shape and internal structure and can be tightened with screws. A pair of reels inserted into each reel, an endless magnetic tape pulled out from the winding shaft of one force on these reels and wound from the outer periphery of the other force, and the midpoint of the center connecting line of both reel shafts of the case. a groove opened perpendicularly to the groove, a pair of guide rods attached to the grooves so that their positions can be adjusted with the tape interposed therebetween; A diagonal ■ for guiding the tape pulled out from the reel winding shaft.
An arcuate guide piece formed with a letter-shaped notch, a sliding ring that is rotatably fitted and inserted into the reel winding shaft to suppress the wound tape, and a pinch roller pivotally attached to the front end side of the case. This twin tape cartridge is equipped with a magnetic head and a pad for a track cutting device, respectively, so that recording and playback can be performed at both the front and rear ends. 2. The pinch roller shaft of the above upper and lower case is
2. A cartridge according to claim 1, which is a utility model registered, and is provided with an axial hole formed with a female thread, and is formed by integrally tightening the cases with each other with screws. 3. The reel has a winding shaft formed of a truncated conical portion having a reverse taper and a disc portion at the lower end thereof,
The outer edge of the disc part is also formed with a downward slope, and the reel base frame has many tapered ribs protruding in a radial manner, and the outer peripheral edge is sloped downward. A cartridge according to claim 1 of patent registration. 4. The cartridge according to claim 1, wherein the center hole of the moving ring is shaped like a multi-valve honeycomb. 5. The guide rod includes a screw inserted into the slot from the surface of the case, a sleeve that can be screwed into the screw, a shaft tube that is fitted around the outer circumference of the sleeve, and a nut at the tip of the screw. A cartridge according to claim 1, which is fixed at any position on the groove by the screw and the sleeve. 6. The cartridge according to claim 1, wherein the guide plate has elongated holes at both ends into which the screw tips of the guide rod are inserted, and is fixed with nuts. 7. The car according to claim 3 of the utility model registration, wherein the height of the truncated conical portion of the reel winding shaft is such that both edges of the tape abut the upper and lower disc portions of the reel winding shaft, respectively. ) IJ Tsuji.