JPH0319086Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a cassette tape recorder, and particularly to a magnetic tape erroneous loading prevention mechanism for a tape recorder.

[Prior art]

In a tape recorder, a magnetic tape is driven while being held between a capstan shaft and a pinch roller. Therefore, when installing the tape cassette, the magnetic tape must be reliably loaded onto the pinch roller side of the capstan shaft. However, if the magnetic tape is slack, or if the mounting position of the tape cassette is slightly shifted, there is a possibility that the magnetic tape will be loaded onto the reel shaft side of the capstan shaft, that is, the side opposite to the pinch roller. When the magnetic tape is loaded onto the reel shaft side of the capstan shaft, the driving force of the capstan shaft cannot be sufficiently transmitted to the magnetic tape, and the magnetic tape cannot be run at a predetermined speed. Furthermore, the magnetic tape may become wrapped around the capstan shaft or become entangled within the drive mechanism of the tape recorder. In this case, there is a high possibility that the magnetic tape will be damaged by scratches, bends, etc. and become unusable.

[Purpose of invention]

This invention was made in view of the above points, and its purpose is to provide a magnetic tape erroneous loading prevention mechanism that can reliably load the magnetic tape onto the pinch roller side of the capstan shaft.

[Summary of the idea]

In order to achieve the above object, the magnetic tape erroneous loading prevention mechanism of the present invention includes a guide member which is erected on the board of the tape recorder and which can be inserted into the capstan shaft insertion hole of the tape cassette together with the capstan shaft. The guide member is formed of a flat leaf spring, is located opposite to the side of the capstan shaft opposite to the pinch roller, and extends along the capstan shaft to above the free end of the capstan shaft. . The extending end of the guide member is bent toward the pinch roller and toward the substrate, and extends to approximately the center of the free end of the capstan shaft. Thereby, this extending end portion forms a guide portion that guides the magnetic tape of the tape cassette loaded into the tape recorder toward the pinch roller side of the capstan shaft. According to this erroneous loading prevention mechanism, even if the magnetic tape in the tape cassette is somewhat slack, the magnetic tape is guided by the guide portion of the guide member and is reliably loaded onto the pinch roller side of the capstan shaft. Therefore, it is possible to prevent incorrect loading of the magnetic tape, that is, loading the magnetic tape onto the reel shaft side of the capstan shaft, and damage to the magnetic tape and tape recorder caused by this.

[Example of idea]

Embodiments of this invention will be described in detail below with reference to the drawings.

FIG. 1 shows the main parts of a tape recorder equipped with a magnetic tape erroneous loading prevention mechanism according to this invention. This tape recorder has a substrate 10, a capstan shaft 12 and a pair of reel shafts 14 rotatably attached to the substrate. Furthermore, a pinch roller lever 18 that supports the pinch roller 16 is mounted on the substrate 10. As shown in FIGS. 1 and 2, the misloading prevention mechanism is installed upright on the board 10 and faces only the side of the capstan shaft 12 opposite to the pinch roller 16, that is, only the reel shaft 14 side. A guide member 20 is provided. This guide member 20
is made of a flat leaf spring and is screwed onto the substrate 10. Further, the guide member 20 extends substantially perpendicularly along the capstan shaft 12 from the base plate 10 to above the free end of the capstan shaft. This guide member 20 is connected to the capstan shaft 12.
At the same time, it can be inserted into the capstan shaft insertion hole 24 of the tape cassette 22.

Further, the extending end portion of the guide member 20 is bent toward the pinch roller 16 side toward the substrate 10, and extends to above the substantially central portion of the free end of the capstan shaft 12. That is, the extending end of the guide member 20 extends downwardly toward the free end of the capstan shaft 12 in FIG.
A guide portion 28 for guiding the second magnetic tape 26 is formed.

Next, the case where the tape cassette 22 is loaded into the tape recorder will be explained. FIG. 2 shows a state in which the magnetic tape 26 is slack, that is, a state in which the running portion of the magnetic tape is shifted to the left of a predetermined position. If the guide member 20 is not provided, and the tape cassette 22 is loaded in the direction of arrow A, the running portion of the magnetic tape 26 will be loaded toward the reel shaft side of the capstan shaft 12, that is, toward the left side. However, the guide member 0
3 and 4, the running portion of the magnetic tape 26 is guided by the guide portion 28 and loaded onto the pinch roller 16 side of the capstan shaft 12. Thereafter, the magnetic tape 26 is held between the capstan shaft 12 and the pinch roller 16 and run at a predetermined driving speed.

According to the magnetic tape misloading prevention mechanism configured as described above, even if the magnetic tape is slack or the tape cassette is loaded with a slight deviation, the magnetic tape can be reliably placed on the pinch roller side of the capstan shaft. It is possible to prevent incorrect loading of the magnetic tape and damage to the magnetic tape caused by this. Moreover, since the guide member is formed of a leaf spring, even if some force acts on the guide member and deforms it, the guide member can easily return to its original position due to its elasticity. For example, when loading a tape cassette, even if the guide portion 28 of the guide member 20 comes into contact with the peripheral edge of the capstan shaft insertion hole 24 of the tape cassette, the guide portion will temporarily close the capstan shaft insertion hole due to elastic deformation of the guide member. It is displaced in a direction away from the peripheral edge, inserted into the capstan shaft insertion hole, and then returned to its original position. Therefore, the tape cassette can be loaded smoothly. Therefore, this erroneous loading prevention mechanism is particularly useful in a tape recorder, such as a car stereo, where the loaded state of the magnetic tape cannot be confirmed from the outside. Furthermore, since the guide member 20 is located facing only the side of the capstan shaft 12 opposite to the pinch roller 16, a narrow passage formed by the guide member and the capstan shaft is created near the tape running path. There is no risk of the magnetic tape being accidentally wound up in such a narrow passage.

Note that the above-mentioned embodiments are for explaining the present application, and the present application is not limited to the above-mentioned embodiments. Further, although the guide portion 28 extends to the right side of the center of the free end of the capstan shaft in FIG. 2, it can sufficiently guide the magnetic tape even if it extends only to the left side of the center of the free end. Furthermore, the guide portion may extend to the right end of the free end of the capstan shaft.

In addition, the misloading prevention mechanism of this invention can be applied to both microcassette tape recorders and compact cassette tape recorders, as well as types in which the tape cassette is loaded perpendicularly to the board and tapes such as the so-called kangaroo pocket. Needless to say, the present invention can also be applied to tape recorders in which the cassette is rotated and loaded.

[Effect of idea]

According to the magnetic tape erroneous loading prevention mechanism of this invention, a guide member is provided which stands substantially perpendicularly on the board of the tape recorder and which can be inserted into the capstan shaft insertion hole of the tape cassette together with the capstan shaft. This guide member is formed of a flat leaf spring, is located facing only the side of the capstan shaft opposite to the pinch roller, and extends along the capstan shaft to above the free end of the capstan shaft. The extending end portion of the guide member is bent toward the pinch roller toward the substrate, and extends to approximately the center of the free end of the capstan shaft. Thereby, this extending end portion forms a guide portion that guides the magnetic tape of the tape cassette loaded into the tape recorder toward the pinch roller side of the capstan shaft. According to this erroneous loading prevention device, even if the magnetic tape in the tape cassette is somewhat slack, the magnetic tape is guided by the guide portion of the guide member and is reliably loaded onto the pinch roller side of the capstan shaft. Therefore, incorrect loading of the magnetic tape, that is, loading the magnetic tape onto the reel shaft side of the capstan shaft, and damage to the magnetic tape and tape recorder caused by this can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts and tape cassette of a tape recorder equipped with a magnetic tape erroneous loading prevention mechanism according to an embodiment of the invention, and FIGS. 2 to 4 show the tape cassette being loaded into the tape recorder. FIG. 3 is a schematic cross-sectional view showing each process. 10... Board, 12... Capstan shaft, 14
... Reel shaft, 16 ... Pinch roller, 20 ...
Guide member, 22... Tape cassette, 24...
Capstan shaft insertion hole, 26...Magnetic tape, 2
8...Guide section.

Claims (1)

[Scope of utility model registration request] It is formed of a flat leaf spring and stands approximately perpendicularly on the board of the tape recorder, facing only the side opposite to the pinch roller of the capstan shaft. A guide member is provided that extends above the free end and can be inserted into the capstan insertion hole of the tape cassette together with the capstan shaft, and the extending end of the guide member is bent toward the pinch roller side toward the substrate. Misloading of a magnetic tape characterized by forming a guide portion extending to approximately the center of the free end of the capstan shaft and guiding the magnetic tape of a tape cassette loaded into a tape recorder toward the pinch roller side of the capstan shaft. Prevention mechanism.