JPH0610487Y2 - Tape recorder - Google Patents

Description

The present invention relates to a reciprocating tape recorder, and more particularly to a head reversing mechanism thereof.

(Prior Art) The applicant of the present invention has found that the head substrate moving cam body moves the head substrate in accordance with the operation mode when the tape is traveling in the forward direction, and the forward traveling cam portion is in the operation mode when traveling in the reverse direction. And a reverse-direction cam portion for moving the head substrate in accordance therewith, and a head rotation cam for rotating the head when switching the tape traveling direction,
The head rotation cam includes a forward-direction running rotation part and a reverse-direction running rotation part of the tape, and is provided on a side surface of the head substrate moving cam body. I filed a utility model registration application for the mechanism (see Japanese Utility Model Application No. 62-68507).

According to the tape recorder of the above application, since the head rotating cam is formed by using the side surface of the head substrate moving cam body, it is possible to form a cam having two functions in one cam body, and the number of parts is increased. And the assembling cost can be reduced. Further, since the contact piece for detecting the rotational position of the cam body can be formed inside the head rotation cam which is a side surface cam, there is an effect that the height dimension can be reduced.

(Problems to be Solved by the Invention) The present invention aims to further improve the tape recorder according to the above application. That is, the head reversal is performed in the stop mode, but by reducing the rotational biasing force of the head in the stop mode, the impact force and the impact sound at the time of head reversal are reduced, and the constituent members of the head reversing mechanism are aged. An object of the present invention is to provide a tape recorder capable of preventing the tape recorder from being deformed due to distortion due to general creep.

(Means for Solving Problems) The present invention relates to a tape recorder provided with a head reversing mechanism, in which the head reversing mechanism is a reversing spring for reversing the head and a reversing spring abutting against the reversing spring. A head reversing member provided with a large diameter portion and a small diameter portion for urging the head reversing member by differentiating the contact portion of the head reversing member with the reversing spring in the recording / reproducing state and the stop state. The member is characterized in that the reversing spring is strongly biased in the recording / reproducing state and the reversing spring is biased slightly in the stopped state.

(Operation) The head reversing member biases the reversing spring, and the biasing force causes the head to be reversed. The portion where the head reversing spring abuts is switched between the large diameter portion and the small diameter portion in the recording / reproducing state and the stop state, whereby the head reversing member largely urges the reversing spring in the recording / reproducing state to record the head. Be sure to position at the playback position. In the stop state, the urging force of the reversing spring is small, and the force applied to the head reversing mechanism is small.

(Embodiment) An embodiment of the tape recorder according to the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, a shaft 13 is fixed between the chassis 11 and the circuit board 12, and the head substrate moving cam body 14 is rotatably supported by the shaft 13. The cam body 14 is rotationally driven to a position according to the operation mode by engaging a gear 51 formed on the outer periphery thereof with a gear rotationally driven by an assist motor (not shown).

As shown in FIGS. 3 to 5, the cam body 14 has a forward traveling cam portion 32a for moving the head substrate according to the operation mode when the tape is traveling in the forward direction, and the tape is traveling in the reverse direction. At the same time, it has a cam portion 34 consisting of a reverse running cam portion 32b for moving the head substrate according to the operation mode, and a head rotating cam 16 for rotating the head when switching the running direction of the tape integrally. Have.
The forward traveling cam portion 32a and the reverse traveling cam portion 32b.
Is formed in a groove shape on the upper surface side of the cam body 14, and is line-symmetric with respect to a diametrical line X-X passing through the center of rotation, and
Both ends of both cam parts 32a, 32b are continuous and the shaft 13
Is formed so as to make one round. As shown in detail in FIG. 3, the cam portions 32a and 32b have a region of θa where the radius from the center of rotation is the smallest radius Ra with respect to the line XX, and a region from the region θa to the radius Rb is large. Area θb
And a region θc where a circular arc having a radius Rb continues and then changes to a radius Rc larger than the radius Rb, and a region formed by a circular arc having the radius Rc. The boundary between the areas θa and θb is the stop mode position, the boundary between the areas θb and θc is the pause mode position, and the boundary between the area θc and the circular arc area having the radius Rc is the recording / reproducing mode position. The forward traveling cam portion 32a and the backward traveling cam portion 32b are connected to each other in the region of θa and the region of radius Rc corresponding to the recording / reproducing mode and are formed line-symmetrically.

The head rotating cam 16 is formed on the lower side surface of the cam body 14, and includes a tape forward traveling portion 16a and a tape backward traveling portion 16b. Each of these rotating parts 16
The a and 16b form a lifting portion that continuously changes the radius from the center of the shaft 13, and the outer peripheral sides of these rotating portions 16a and 16b are connected to arc portions 16c and 16d having a constant radius, respectively. The head rotating cam 16 is formed symmetrically with respect to the center line X-X in plan view as shown in FIG. 3, but as shown in FIG. 1 and FIG. The rotating portion 16a and the arc portion 16c subsequent thereto are formed below the reverse traveling rotating portion 16b and the arc portion 16d subsequent thereto.

As shown in FIG. 4, a mode control switch contact piece 52 is fixed to the lower surface of the cam body 14, and the switch contact piece 52 is in sliding contact with the switch pattern formed on the circuit board 12. The switch contact piece 52 and the switch pattern constitute a digital switch, and generate a digital signal of an appropriate number of bits, for example, 3 bits, for each rotational position of the cam body 14 corresponding to each operation mode for each tape running direction. One bit of the digital signal is emitted over an angle range of about 180 degrees and is used to detect whether the tape running direction is the forward direction or the reverse direction, and the other bits are used to detect the operation mode. The cam body 14 to the rotational position corresponding to the specified operation mode in the specified tape running direction.
When it rotates, a detection signal is issued to stop the rotation of the cam body 14.

1 and 4, the cam portion 32 of the cam body 14 has a shaft
A pin 31 provided at the tip of the head substrate 15 extending in the radial direction of the cam body 14 beyond the position of 13 is engaged. The head substrate 15 has a head supporting portion 17 which is vertically raised by partially bending the head substrate 15, and a horizontal bending portion 18 is further formed at a tip end portion of the head supporting portion 17. A bearing metal 43 is fitted in the head support portion 17, and the bearing metal 43 rotatably supports the rotary shaft 21 about a horizontal axis. A head 19, a head mounting member 20, and a gear 22 are integrally attached to the rotating shaft 21. The components including the cam body 14 and the head substrate 15 constitute a head moving mechanism that inserts the head 19 into and out of the tape cassette (not shown).

1 and 2, the head support portion of the head substrate 15
A shaft 26 is fixedly mounted on the shaft 17, and a fan gear 27 having a gear portion formed on the upper end edge thereof is rotatably supported on the shaft 26 in a vertical plane. The gear portion of the sector gear 27 is the gear 22
Mesh with each other. An inverted U-shaped head reversing spring 28 is interposed between the head supporting portion 17 of the head substrate 15 and the sector gear 27. The reversing spring 28 sandwiches the shaft 26 from both sides and is rotatable about the shaft 26 as a fulcrum, and the folded portion at the upper end of the reversing spring 28 engages with a pin 29 fixedly planted in the sector gear 27. ing. Both ends of the reversing spring 28 extending downward penetrate the window hole 30 of the chassis 11 to sandwich an engaging portion 34 formed in a bridge shape at the end of the head reversing member 33, and further, this engaging portion 34 Window 35 of the head reversing member 33 formed below
Through. The head reversing member 33 is movable by a guide pin (not shown) in the direction perpendicular to the paper surface in FIG. 1 and in the left-right direction in FIG. 2. As the head reversing member 33 moves, the reversing spring is rotated by the engaging portion 34. 28 is pushed, and the reversing spring 28 rotates about the shaft 26 in the vertical plane. The head reversing member 33 is formed in a fork shape on the side opposite to the end portion where the engaging portion 34 is formed, and has a pair of contact portions 36 and 37. The one contact portion 36 is bent and extends below the other contact portion 37. The pair of contact portions 36 and 37 are arranged so as to sandwich the head rotation cam 16, one contact portion 36 faces the forward traveling rotation portion 16a of the cam 16, and the other contact portion 37 is The cam 16 is opposed to the reverse traveling rotating portion 16b.

Head rotating cam 16, head mounting member 20, gear 22, fan gear 27, reversing spring 28, head reversing member 33, and engaging portion 34.
The component portion including the above constitutes a head reversing mechanism for reversing the head 19 according to the tape running direction at a position where the head 19 is detached from a cassette (not shown).

Here, as shown in detail in FIG. 6 and FIG. 7, the engaging portion 34 has a small outer shape and a cross-sectional shape by cutting approximately half of the oval-shaped member in the length direction. Has a triangular chevron portion 34c, a large-diameter oval cross-section portion 34a that is the remaining portion that is not cut, and an inclined surface 34b that connects these oval cross-section portion 34a and chevron portion 34c. It becomes. The engaging portion 34 is a mountain-shaped portion on the right side in FIG.
It is oriented so that 34c is located. As a result, when the head substrate 15 moves to the right side in FIG. 1 together with the head 19 and the reversing spring 28 and the head 19 is in the stop mode in which the head 19 is separated from the cassette, the reversing spring 28 is moved as shown in FIG. A recording / reproducing mode in which the head substrate 15 is moved to the left side in FIG. 1 and the head 19 is inserted into the cassette while facing the chevron-shaped portion 34c of the engaging portion 34, or
When 19 is in the pause mode slightly retracted from the inside of the cassette, as shown in FIG. 7, the reversing spring 28 comes to face the oval-shaped section 34a of the engaging portion 34 having a large outer diameter. ing.

In FIGS. 1 and 2, a pair of azimuth adjusting screws 38, 38 are screwed into the bent portion 18 of the head substrate 15. At the tip of the azimuth adjusting screws 38, 38 protruding downward from the bent portion 18, a head mounting member is provided depending on the rotational position of the head 19.
One of the pair of contact portions 39, 40 of 20 contacts. The second
In the state shown in the figure, the head 19 is at the intermediate position of the rotating operation.

The lower surface of the base end portion of the head substrate 15, that is, the lower surface of the head substrate 15 on the side where the head support portion 17 is formed is a pair of balls 4 rotatably held on the chassis 11 by ball receivers 47, 47.
Abuts 6,46. The pair of balls 46, 46 are arranged on both the left and right sides with the head supporting portion 17 interposed therebetween, and the head substrate
The left and right sides of the base end side of 15 are supported by a pair of balls 46, 46.

The pin 31 engaged with the cam portion 32 of the cam body 14 has a flange 24 in the middle portion and an adjusting screw portion 23 following the flange 24, and the adjusting screw portion 23 with respect to the head substrate 15. By being screwed in from the lower surface side, the pin 31 becomes the head substrate.
It is attached to 15 in one. Further, the pin 31 is engaged with the cam portion 32 of the cam body 14 after passing through the guide groove 42 formed in the chassis 11 in the moving direction of the head substrate 15. That is, the pin 31 as a cam follower for moving the head substrate 15 back and forth also serves as a guide pin of the head substrate 15. The flange portion 24 of the pin 31 is always in contact with both side edge portions of the guide groove 42 of the chassis 11. Therefore, when the adjusting screw 23 is rotated, the head substrate for the chassis 11 is rotated.
The distance on the tip side of 15 changes and the head substrate 15
The head substrate 15 and the head 19 supported by the head substrate 15 and the head 19 supported thereby are rotated about the contact point with the 46, 46 as a fulcrum to change the tilt angle.

Next, the operation of the above embodiment will be described.

Now, it is assumed that the cam body 14 is rotated to a position corresponding to the designated tape traveling direction and operation mode by an assist motor (not shown). If the designated tape running direction is opposite to the tape running direction up to then, the lever 33 is moved by the head rotating cam 16 in the direction perpendicular to the paper surface in FIG. For example, when the tape is switched from running in the reverse direction to running in the forward direction, the cam body 14 is rotated in the counterclockwise direction in FIG. 3, and the cam body 14 is in the middle of switching the running direction as shown in FIG. To a rotation position as shown in FIG. Due to the rotation of the cam body 14, the forward-direction traveling rotating portion 16a of the head-rotating cam 16 contacts the contact portion 3 of the lever 33.
Push 6 to move lever 33 to the right as shown in FIG. The lever 33 has an engaging portion 34 that pushes the reversing spring 28 to rotate the shaft.
The reversing spring 28 is rotated around the fulcrum 26, and the reversing spring 28 pushes the pin 29 to rotate the sector gear 27. The turning force of the sector gear 27 is transmitted to the gear 22, the head 19 integrated with the gear 22 is reversed, and the head cap is made to face the track corresponding to the tape running direction.

When the tape is switched from the forward running to the backward running, the assist motor causes the cam body 14 to rotate in the clockwise direction from the state shown in FIG. 5, so that the state where the cam body 14 is in the middle of rotation as shown in FIG. After that, when the reverse traveling rotating portion 16b passes the position of the contact portion 37 of the lever 33, the rotating portion 16b pushes the contact portion 37 to move the lever 33 to the left, so that the head 19 described above. The head gap faces the track corresponding to the tape running direction by being reversed in the opposite direction.

On the other hand, as the cam body 14 rotates, the cam portion 32 including the forward traveling cam portion 32a and the reverse traveling cam portion 32b also rotates,
The cam portion 32 pushes the pin 31 of the head substrate 15 to move the head substrate 15 in the left-right direction in FIG. 1, and the head 19 comes into contact with and separates from a tape (not shown) according to a designated operation mode. . More specifically, when the stop mode is designated, the rotational position of the cam body 14 is set so that the pin 31 of the head substrate 15 is engaged with the position of the small radius Ra of the boundary between the regions θa and θb of the cam portion 32. Determined, head
19 is separated from the tape. Further, the tape is fast forwarded at the same rotation position as the stop position of the cam body 14. That is, since the head is separated from the tape at the rotational position as described above, if the tape is run at high speed in the forward direction or the reverse direction according to the designation of fast-forward or rewind at the rotational position, the tape is fast-forwarded or wound. You can make a return.

Next, if the pause mode is designated, the cam body 14 rotates by the area θb, the pin 31 is pushed to the position of the radius Rb by the lift of the cam portion 32, and the head substrate 15 moves to the left in FIG. The magnetic head 19 is moved so that the magnetic head 19 comes into light contact with the tape (not shown). Further, by moving the head substrate 15, a pinch roller arm (not shown), which is already selected depending on the tape traveling direction, is hooked and moved forward to bring the pinch roller closer to the capstan. Here, since the tape is not yet in contact with the capstan, the tape is not transported and is in a pause state. When a review or cue is specified in this paused state, the cam body 14 is stopped at that position, the tape is transported at high speed in the direction according to the review or cue, and the recording signal is reproduced from the head lightly touching the tape. Enter review or queue mode.

Next, when the recording / reproducing mode is designated, the cam body 14 is further rotated in an angular range corresponding to the region θc, the pin 31 is pushed to the position of the radius Rc by the lift of the cam portion 32, and the head substrate 15 is moved to the position shown in FIG. Is further moved to the left, and the head 19 makes sliding contact with a tape (not shown). Further, as the head substrate 15 moves, the pinch roller arm further advances and presses it against the tape capstan to transport the tape at a constant speed.
Here, the head 19 enters a recording / reproducing mode in which a signal is recorded on the tape and the recorded signal is reproduced.

The forward traveling rotator 16a or the reverse traveling rotator 16b.
When the tape running direction is switched by abutting the abutting portions 36 and 37 of the head reversing member 33 on the head reversing member 33, the pin 31 of the head substrate 15 has an area θ with a constant radius Ra of the cam 32.
a, θa, the head substrate 15 moves to the right in FIG. 1, and the head 19 is at the stop position separated from the cassette (not shown). At this stop position,
As shown in FIG. 8, since one end of the reversing spring 28 is pushed by the portion 34c of the engaging portion 34 of the head reversing member 33 having a small cross-sectional chevron shape, the head reversing member 33 is rotated by the reversing spring. 2
Force 8 small. Therefore, the clearance a between the outer periphery of the shaft 26 and one arm of the reversing spring 28 at this time is relatively small.

On the other hand, in the recording / reproducing mode or the pause mode, since the head substrate 15 moves to the left side in FIG. 1, one end of the reversing spring 28 has the engaging portion 34 as shown in FIG.
Since it is pushed by the oval section 34a with a large outer shape,
As shown in FIG. 9, the engaging portion 34 of the head reversing member 33 largely biases the reversing spring 28. Therefore, the axis 26 at this time
Between the outer circumference of the arm and one arm of the reversing spring 28 b
Is larger than the clearance a in the stop mode in which the head is reversed.

7 to 9 show the operation when the tape is running in one direction, but when the tape is running in the opposite direction, the other arm of the reversing spring 28 is similarly engaged. The joint portion 34 comes into contact with a chevron-shaped portion 34c or an oval-shaped portion 34a in section, and operates in the same manner.

In this way, the head reversing member 33 slightly biases the reversing spring 28 in the stop mode, and the tape running direction is reversed in this stop mode. Therefore, with the biasing force of the reversing spring 28 being small, the head 19
Since the reversing operation is performed, the head mounting member 20
The impact force when the abutting portion 39 or 40 of the abutting portion abuts on the azimuth adjusting screws 38, 38 is small, and it is possible to prevent the deformation and wear of the portions abutting each other to prevent the deviation of the azimuth angle and to make the impact noise. Can be made smaller. On the other hand, at the recording / reproducing position, the head reversing member 33 largely urges the reversing spring 28, so that the abutting portions 39, 40 of the head mounting member 20 are reliably pressed against the azimuth adjusting screws 38, 38, and the head 19 is fixed. It is possible to prevent the deviation of the azimuth angle and the like by surely positioning at the position. Further, the tape recorder is overwhelmingly longer in the stop mode position than in the recording / reproducing time, but in the above embodiment, the biasing force of the spring 28 for reversing the head is weak in the stop mode position. Therefore, the pressure contact force of the contact portions 36 and 37 of the head reversing member 33 against the surface of the cam 16 due to the reaction also becomes small, and it is possible to prevent the creep deformation due to the impact during transportation, the high temperature condition, the passage of time, and the like. it can.

The switching of each operation mode is not limited to the order described above. If the operation modes are specified in any order, the cam body 14 is rotationally driven in the clockwise direction and the counterclockwise direction according to the specified operation mode. It is switched to the mode. Cam part
Since the forward running cam 32a and the backward running cam portion 32b are formed symmetrically with respect to the center line XX, the tape 32 is the same as when the tape is running in the forward direction even when the tape is running in the backward direction. The cam body at the position corresponding to each specified operation mode.
14 is rotated, and the head 19 moves back and forth according to each operation mode.

According to the above-described embodiment, while the cam body 14 rotates from the intermediate position to the stop position shown in FIG. The head reversing member 33 is moved rightward or leftward by being pushed by the traveling rotating portion 16b, and thereafter the cam body 14 rotates with the contact portion 36 or 37 in contact with the cam surface having the radius R. The head reversing member 33 does not move. On the other hand, a load is applied to the head reversing member 33 by the reaction of the head reversing spring 28, and this load is received by the cam surface having the radius R. Since the shape of the cam surface having the radius R is the same on both the forward running side and the backward running side of the tape, there is no difference in the load between the forward running and the backward running, and there is no time difference between the reversal of the head 19. Further, the rotational position accuracy of the cam body 14 is substantially the same due to the difference in the tape running direction.

Further, since the head rotating cam 16 is formed by using the side surface of the head substrate moving cam body 14, it is possible to form a cam having two functions in one cam body, which reduces the number of parts and the assembly cost. It can be reduced. Since the contact piece 52 for detecting the rotational position of the cam body 14 can be formed inside the head rotation cam 16 which is a side surface cam, the height dimension can be reduced.

Since the head rotation cam 16 is formed along an arc centered on the center of rotation except for the forward-direction traveling rotation portion 16a and the reverse-direction traveling rotation portion 16b, the end portion of the movement stroke of the head reversing member 33. And the load applied to the head reversing member 33 can be received at the end of the moving stroke.

According to the present invention, a large-diameter portion and a small-diameter portion are formed on the head reversing member, and the large-diameter portion and the small-diameter portion are selectively switched depending on the stop mode or the recording / reproducing mode to contact the reversing spring. By contacting the head reversing member, the reversing spring is biased slightly in the stop mode, and the tape running direction is reversed in this stop mode. Therefore, the head reversing is performed with the biasing force of the reversing spring being small. The impact force at the time of reversing operation is small, the deformation and wear of the portions abutting each other can be prevented, the deviation of the azimuth angle can be prevented, and the impact noise can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an embodiment of a tape recorder according to the present invention, FIG. 2 is a rear view of the same as above, FIG. 3 is a plan view of a portion of a cam body in the above embodiment, and FIG. FIG. 5 is a cross-sectional side view of a body portion, FIG. 5 is a plan view showing another operation mode of the cam body portion according to FIG. 3, and FIG. 6 is an engaging portion of the head reversing member in the above embodiment. FIG. 7 is an enlarged perspective view, FIG. 7 is a plan view showing the relationship between the engaging portion and the reversing spring, and FIG.
FIG. 9 is a rear view showing a biasing mode of the reversing spring in the above embodiment, and FIG. 9 is a rear view showing another biasing mode of the reversing spring. 14 …… Cam body that constitutes the head moving mechanism, 15 …… Head substrate that constitutes the head moving mechanism, 19 …… Head, 27 ……
A fan-shaped gear that constitutes the head reversing mechanism, 28 ... Reversing spring, 33 ... Head reversing member, 34 ... Engagement portion that constitutes the head reversing mechanism.

Claims (1)

[Scope of utility model registration request] 1. A head moving mechanism that inserts a head into a cassette to establish a recording / reproducing state and separates the head from the cassette to a stop state, and a position in the stop state where the head separates from the cassette, depending on the tape running direction. In a tape recorder provided with a head reversing mechanism for reversing the head, the head reversing mechanism is mainly used for reversing the head and for biasing the reversing spring by contacting the reversing spring. A head reversing member having a diameter portion and a small diameter portion, wherein the contact portion of the head reversing member with the reversing spring is different between the recording / reproducing state and the stop state. Is a tape recorder characterized in that the reversing spring is strongly urged in the recording / reproducing state, and the reversing spring is slightly urged in the stopped state.