JPH0535449Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a magnetic head reversal switching mechanism in a magnetic head reversal type tape recorder.

``Prior Art'' A magnetic head reversal switching mechanism in a tape recorder is constructed roughly as shown in FIGS. 6 to 9. FIG.
Figure 7 is a plan view of the same as above, Figure 8 is a bottom view showing the direction slider and cam gear that move linearly;
FIG. 9 is a bottom view of the cam gear.

In the figure, 31 is a slide base on which the magnetic head 33 is mounted, and as shown in FIG.
When playing (or cueing), it moves forward in the tape T direction, and when it stops, it moves backward.
The head mounting block 3 is attached to this slide base 31.
2 is fixed, and a magnetic head 33 is attached to this so as to be freely reversible by a reversing mechanism 34. This reversing mechanism 34 includes a gear 35 fixed to the rotating shaft 33a of the magnetic head 33, and a gear 35 fixed to the rotating shaft 33a of the magnetic head 33.
It consists of a gear 37 that meshes with the magnetic head, and a spring 38 stretched between the gear 37 and the head mounting block 32.By rotating the gear 37 via a lever 36 formed in a part of the gear 37, the magnetic head can be rotated. 33 rotates like a click.

41 is a direction slider that moves linearly in the 41F direction as shown in FIGS. 6 and 8, and a notch 42 is formed in a part of the direction slider, and the lever 36 is engaged with the notch 42. When the direction slider 41 slides a large distance, the magnetic head 33 is reversed.

Reference numeral 51 denotes a cam gear for imparting linear motion to the direction slider 41, which has incisor teeth formed at predetermined locations and is rotated by a drive gear provided coaxially with a capstan wheel (not shown). A cam track 52 is formed on the back side, and an engagement pin 43 protruding from the direction slider 41 engages with the cam track 52, so that the direction slider is rotated by the rotation of the cam gear 51. 41 moves in a straight line. Note that a cam portion 5 for moving the slide base 31 forward or backward is provided on the front side of the cam gear.
3. A cam groove (not shown) that engages with the idler mechanism and trigger lever is formed.

The cam track 52 formed on the cam gear 51 is the ninth
As shown in the figure, it consists of a cam track 54 on the reverse (RVS) side and a cam track 55 on the forward (FWD) side, and when the engagement pin 43 provided on the direction slider 41 is in the position The forward (FWD) side is at the RVS side, and the forward (FWD) side is at the forward (FWD) side.
3 FWD (STOP) → RVS inversion part.

``Problem to be solved by the invention'' In the conventional magnetic head reversal switching mechanism, the cam track 52 formed in the cam gear 51 is formed as described above, and is only at the position at the time of reset (STOP). Therefore, when the stop operation is performed on the reverse (RVS) side, the magnetic head 3
3 will definitely be reversed. For this reason, there is a drawback that it is difficult to tell whether the tape running direction was forward or reverse at the time of reset (STOP), and since the magnetic head 33 will make unnecessary reversals, the head read, screw, etc. There were drawbacks such as a decrease in reliability due to loosening of the shaft, misalignment of the azimuth, and wear of the shafts.

The purpose of this invention is to eliminate the drawbacks of the conventional magnetic head reversal switching mechanism described above, to enable stop (reset) even on the reverse side, and to improve reliability without causing the magnetic head to perform unnecessary reversal operations. An object of the present invention is to provide a magnetic head reversal switching mechanism for a tape recorder.

``Means for Solving the Problems'' The magnetic head reversal switching mechanism for a tape recorder according to this invention consists of a gear for reversing the magnetic head to the forward side or reverse side by rotating in one direction or the other direction. A slider for applying rotational force to the gear by linear motion, and a cam track to which an engagement pin provided on the slider engages are formed. In a tape recorder magnetic head reversal switching mechanism comprising a cam gear configured to provide linear motion, the cam gear is formed with two branched cam tracks for moving the slider to the forward side or the reverse side, Further, each cam trajectory is formed by branching to correspond to play and queue, thereby providing four cam orbits: forward play, forward queue, reverse queue, and reverse play.

"Function" The engagement pin of the direction slider stops (resets) the cam track formed in the cam gear.
position, and the cam gear starts rotating via the capstan wheel when the tape recorder is operated. At this time, depending on the operation mode, the engagement pin enters the forward or reverse cam orbit,
Further, corresponding to the above operation mode, the cam trajectory is either forward side play or cue or reverse side play or cue. The cam gear rotates to a predetermined position and then stops, but as the cam gear rotates, the slide base on which the magnetic head is mounted moves forward, performing a play or cue operation.

Now, if you perform the stop operation during forward play, the cam gear will stop (reset).
Since the engagement pin rotates to the position , the engagement pin comes to the forward stop (reset) position within the cam orbit on the forward side. Also, even if the stop operation is performed during reverse play, the cam gear will rotate to the reverse stop (reset) position.
The engagement pin is located at the reverse stop within the reverse side cam track.

As described above, since the reverse stop (reset) position is within the reverse side cam orbit, the magnetic head will not be reversed even when a stop operation is performed on the reverse side. Therefore, when the reverse play or cue operation is performed again, the engagement pin enters the cam track of the reverse play or reverse cue depending on the operation mode, and the cam gears stop at respective predetermined positions.

When the switching operation from the forward side to the reverse side is performed, the engagement pin enters the reverse side cam orbit from the forward side cam orbit, so the direction slider slides greatly in one direction and the magnetic head is reversed to the reverse side. . Also, when switching from the reverse side to the forward side, the engagement pin moves from the reverse side cam orbit to the forward side cam orbit, so the direction slider slides greatly in the other direction and the magnetic head is reversed to the forward side. .

Embodiment An embodiment of the magnetic head reversal switching mechanism for a tape recorder according to this invention will be described with reference to FIGS. 1 to 5.

Fig. 1 is a rear view showing the magnetic head reversing mechanism, Figs. 2 and 3 are bottom views showing the relationship between the cam gear and the direction slider, Fig. 2 is a forward stop state, and Fig. 3 is a bottom view showing the relationship between the cam gear and the direction slider. indicate the reverse stop state. FIG. 4 is a bottom view of the cam gear, and FIG. 5 is a bottom view of the cam gear showing each operating mode at a location where the engagement pin is located within the cam track.

This invention includes a gear 6 for reversing and switching the magnetic head 3 to the forward side or reverse side by rotating in one direction or the other direction, and a gear 6 that applies rotational force to the gear 6 by linear motion. A cam track 2 is formed in which an engagement pin 7 provided on the direction slider 4 engages, and when rotated, drives the direction slider 4 linearly. In the magnetic head reversal switching mechanism for a tape recorder, the cam gear 1 has two branched cam tracks 11 and 12 for moving the direction slider 4 to the forward side or the reverse side. and furthermore, each cam trajectory is branched to correspond to play and queue, and forward play,
Four cam trajectories 13, 14, 15, and 16 are formed for forward cue, reverse cue, and reverse play.

The above configuration will be explained in detail, but the same components as those of the conventional example explained in FIGS. 5 to 7 will be denoted by the same reference numerals, and detailed explanation thereof will be omitted.

The magnetic head 3 is reversibly attached to a head mounting block 32 provided on a slide base 31, and the gear 6 meshes with a gear 35 fixed to a rotating shaft 33a of the magnetic head 3.
A lever 37 formed in a part of the direction is engaged with a notch 42 formed in the direction slider 4, and the direction slider 4 is in the 4F or 4F position.
When linearly moved in the R direction, the magnetic head 3 is click-likely reversed to the forward side or reverse side, respectively. Reference numeral 10 denotes a spring that biases the direction slider 4 so that it always returns to the forward side.

The cam gear 1 rotates by meshing with a drive gear (not shown) provided on the capstan shaft of a flywheel that rotates around the shaft hole 8. On the upper surface side of the cam gear 1, as explained in the conventional example,
A cam portion for moving the slide base 31 forward or backward, a cam groove (not shown) that engages with the idler mechanism and the trigger lever 5, and the like are formed.

Two toothless parts 17 and 18 are formed on the outer periphery of the cam gear 1 to allow the driving gear to idle, and when a trigger is applied after the trigger lever operated by the solenoid S, the cam gear 1 meshes with the driving gear. and start rotating. The trigger lever 5 is a fulcrum 5a
It rotates around the center, but a part of it has a control pin 5b.
When the trigger lever 5 is actuated, the control pin 5b engages with the control engagement protrusions 4a and 4b provided on the direction slider 4 to control the slide of the direction slider 4. , the engagement pin 7 enters the reverse side cam track 12 to set a state such as reverse play or reverse queue. In addition, in the figure, 9 is the shaft hole of the other flywheel.

As shown in detail in FIG. 4, a cam track 2 is formed on the back side of the cam gear 1, with which the engagement pin 7 engages. The position of the engagement pin 7 in Fig. 4 indicates the forward stop (reset) position, and is guided in the direction of the arrow 7FR by the cam gear 1 rotating counterclockwise, and is set to the respective operation mode. Therefore, the branch point 1 provided on the cam track 2
It branches at 9 and is guided to the forward side or reverse side.

In this embodiment, the cam track 2 branches off from a branch point 19 and has a forward cam track 11 on the outer circumferential side.
On the other hand, a reverse cam track 12 is formed on the inner periphery of the forward cam track 11. Furthermore, the forward cam track 11 branches at a branch point 20 to form a forward play cam track 13 on the outer periphery of the forward cues cam track 14 on the inner periphery of the forward cues cam track 14.
The reverse side cam track 12 is a reversing cam groove 2 in which the magnetic head 3 is reversed from the forward side to the reverse side.
2 and branches at a branch point 21, and a reverse keew cam track 15 is formed on the outer circumferential side, opposite to the forward side.
However, the reverse play cam track 16 is on the inner circumference side.
The reverse kew and reverse play cam tracks 15 and 16 are formed at the junction point 2
The two vehicles join at point 4, and this joining point 24 is the reverse stop (reset) position (a position to be described later) and is reset in the reverse mode.
When the solenoid S is newly triggered, the cam gear 1 rotates, and in the case of the reverse mode, the engagement pin 7 enters the reverse keew cam track 15 or the reverse play cam track 16 from the reverse stop (reset) position.

A reversing cam groove 23 for reversing the magnetic head 3 from the reverse side to the forward side is formed from the merging point 24, and when the direction slider 4 is not controlled by the trigger lever 5, that is, when not in reverse mode. Since the direction slider 4 is always urged by the spring 10 to slide in the forward direction, the engaging pin 7 enters the reversing cam groove 23 from the reverse stop (reset) position. , returns to the forward side, and in the process, the magnetic head 3 is reversed from the reverse side to the forward side. Note that 25 and 26 are hollow portions between the cam tracks.

FIG. 5 shows the various operation modes at the position of the engagement pin 7, where: 1 is forward stop (reset), 2 is forward play, 3 is forward cue, 4 is the reversal of the magnetic head from forward to reverse, 5 is reverse cue, 6 is reverse play, and 7 is reverse stop (reset).
is the reversal point of the magnetic head from reverse to forward. Therefore, the position of the reverse stop (reset) is the forward stop (reset).
The position is formed separately from the position of , and from the state where the engagement pin 7 is stopped (reset) at the position of , the magnetic head 3 can enter the reverse play or reverse skew cam track again without reversing.

``Effect of the invention'' According to the magnetic head reversal switching mechanism of the tape recorder according to this invention, the direction on the forward side and reverse side is maintained as is, so the running direction of the tape can be seen at a glance, and the magnetic head is not wasted. Since there is no reversal operation and the number of reversals is half that of conventional models, it is possible to reduce wear and tear on head lead wires, loosening of screws, misalignment of azimuth, and wear on rotating parts, improving reliability. There are other effects.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the magnetic head reversal switching mechanism of a tape recorder according to this invention, and FIG. 1 is a rear view showing the magnetic head reversal mechanism;
2 and 3 are bottom views showing the relationship between the cam gear and the direction slider, with FIG. 2 showing the forward stop state and FIG. 3 showing the reverse stop state, respectively. FIG. 4 is a bottom view of the cam gear, and FIG. 5 is a bottom view of the cam gear showing each operating mode at a location where the engagement pin is located within the cam track. 6 to 9 show a conventional magnetic head reversal switching mechanism, FIG. 6 is a rear view of the magnetic head support, FIG. 7 is a plan view of the same, and FIG. 8 is a direction slider that moves linearly. FIG. 9 is a bottom view of the cam gear. 1...Cam gear, 3...Magnetic head, 4...Direction slider, 5...Trigger lever,
6... Gear, 7... Engagement pin, 11... Forward side cam orbit, 12... Reverse side cam orbit, 13... Forward play cam orbit, 14
... Cam trajectory of forward cue, 15... Cam trajectory of reverse cue, 16... Cam trajectory of reverse play, 31... Slide base.

Claims (1)

[Claims for Utility Model Registration] A gear for reversing switching of a magnetic head to the forward side or reverse side by rotating in one direction or the other direction, and a rotational force to the gear by linear motion. A tape recorder consisting of a slider for providing linear motion to the slider, and a cam gear having a cam track that engages with an engagement pin provided on the slider, and that rotates to provide linear motion to the slider. In the magnetic head reversal switching mechanism, the cam gear is formed with two branched cam tracks for moving the slider to the forward side or reverse side, and each cam track is further branched to correspond to play and queue. I'm doing it,
A magnetic head reversal switching mechanism characterized by having four cam orbits: forward play, forward cue, reverse cue, and reverse play.