JP2517801Y2 - Automatic stop device for tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) This invention applies to the end of the magnetic recording tape when the end of the magnetic recording tape sent from the tape sending side hub around which the magnetic recording tape is wound. The present invention relates to an automatic stopping device for a tape recorder, which automatically stops the above-mentioned feeding of a magnetic recording tape by utilizing an increase in applied tensile force.

(Prior Art) An automatic stopping device for a conventional tape recorder of the type described above is already widely known from JP-B-57-34576, and this known automatic stopping device for a tape recorder is: a fixed substrate of a tape recorder. When the magnetic recording tape sent from the tape sending side hub reaches the end, the tape has a tape feeding shaft that is rotatably supported by the tape feeding side hub and is engaged with the tape sending side hub around which the magnetic recording tape is wound. A tape end detection lever that is rotated by a tensile force applied to the magnetic recording tape; and a play hook member that engages with a play mode setting member arranged at the play mode setting position and holds the play mode setting member at the play mode setting position. And; rotatably supported on the fixed substrate, started to rotate by the rotation of the tape end detection lever, and fixed to the flywheel after the start of rotation. The abutment portion with which the drive claw abuts, and the abutment portion that abuts the play hook member after the start of rotation and abuts the drive claw of the flywheel, are driven by the drive pawl so that the play hook member relative to the play mode setting member And a trigger member having an engagement releasing portion for releasing the engagement.

In the known automatic stop device for a tape recorder, the abutting portion of the trigger member has a strip plate shape, but the drive claw of the flywheel has a cylindrical shape.

(Problems to be solved by the invention) A relatively large force is required to press the abutting portion of the strip plate shape by the abutting of the cylindrical driving claw to the abutting portion of the strip plate shape. In order to ensure the disengagement operation of the trigger member, the amount of rotation of the trigger member necessary for causing the abutting portion of the trigger member to abut against the drive claw of the flywheel must be increased.

Since the flywheel is made of metal in the known tape recorder, a relatively large force required for the pressing can be secured.

This invention was made under the above circumstances, and the purpose of this invention is to make it possible to reliably perform the disengagement operation of the trigger member even when the inertia force of the flywheel is reduced in order to reduce the weight of the tape recorder. Another object of the present invention is to provide an automatic stopping device for a tape recorder, which can reduce the initial rotation amount of the trigger member.

(Means for Solving the Problems) In order to achieve the above object, an automatic stopping device for a tape recorder according to the present invention is: a tape feeding device in which a magnetic recording tape is wound and supported rotatably on a fixed substrate of the tape recorder. The tape end detection lever that has a tape supply shaft that engages with the side hub and that turns when the magnetic recording tape sent from the tape sending side hub reaches the end due to the tensile force applied to the magnetic recording tape. A play hook member for engaging the play mode setting member arranged at the play mode setting position and holding the play mode setting member at the play mode setting position; a drive unit fixed to the flywheel; It is movably supported and starts to rotate by the above rotation of the tape end detection lever. After the rotation starts, the abutment portion with which the drive unit of the flywheel comes into contact and the flap after the rotation start. And a disengagement portion that disengages the play hook member from the play mode setting member by driving the play hook member by driving the abutment portion that is in contact with the drive portion of the rye wheel by the drive portion. And a trigger member, wherein each of the drive portion of the flywheel and the abutting portion of the trigger member has a substantially wedge-shaped end portion facing each other in the rotation direction of the flywheel. With the start of the rotation of the member, the abutment part of the trigger member moves from one peripheral side of the drive part of the flywheel to the other peripheral side, and after the abutment part of the trigger member moves, the drive part of the flywheel is The other peripheral edge of the end portion abuts the peripheral edge of the end portion of the abutting portion of the trigger member, and after the contact, the drive portion of the flywheel causes the other portion of the other end portion of the flywheel to rotate as the flywheel rotates further. The edge of the end of the abutting portion of the trigger member is gradually moved in the radial direction of the flywheel by the edge, and the trigger member is further rotated, so that the disengagement portion of the trigger member causes the play hook to the play mode setting member. The feature is that the engagement of the members is released.

(Operation) In the automatic stop device for a tape recorder according to the present invention which is configured as described above, the play hook member engages with the play mode setting member arranged at the play mode setting position. While the mode setting member is held at the play mode setting position, the magnetic recording tape sent from the tape sending side hub reaches the end, and the tape end detection lever is rotated by the tensile force applied to the magnetic recording tape. Then, the trigger member starts to rotate by the above rotation of the tape end detection lever.

The drive claw of the flywheel and the abutting portion of the trigger member have substantially wedge-shaped end portions facing each other in the rotation direction of the flywheel, and the abutting portion of the trigger member after the start of rotation. The part moves from one peripheral side of the drive part of the flywheel to the other peripheral side. After the movement of the abutting portion of the trigger member, the driving portion of the flywheel drives the flywheel after the abutting, with the other peripheral edge of the end portion abutting the peripheral edge of the end portion of the abutting portion of the trigger member. As the flywheel further rotates, the other edge of the end gradually moves the edge of the abutting portion of the trigger member in the radial direction of the flywheel, and the trigger member is further rotated. As a result, the engagement releasing portion of the trigger member releases the engagement of the play hook member with the play mode setting member.

(Embodiment) Hereinafter, a tape recorder provided with an automatic stop device according to an embodiment of the present invention will be described in detail.

Figure 9 shows the main metal chassis of the tape recorder.
10 is shown, but in this figure the main chassis
Only the outline of 10 is shown and the openings formed inside the main chassis 10 are omitted for clarity of the drawing.

As shown in FIG. 9, a motor support frame made of synthetic resin is provided on the upper half portion of the right edge of the metal main chassis 10 of the tape recorder.
12 are outsert molded. A motor 14 is attached to the motor support frame 12 via a damping pad 16 and a fixing screw 18
It is fixed by. An output shaft pulley 20 is attached to the output shaft of the motor 14.

On the rear surface of the main chassis 10 shown in FIG. 9, an eject plate made of synthetic resin is provided adjacent to the motor support frame 12.
22 are located. A vertically long guide hole 22a is formed in the lower end area of the left edge portion of the eject plate 22, and a fixing pin 24 made of synthetic resin outsert molded on the back surface of the main chassis 10 is inserted into the guide hole 22a. There is. At the left edge of the eject plate 22, a vertically elongated first spring portion 22b extending upward along the left edge is formed. A horizontally elongated second spring portion 22c extending rightward along the lower edge is formed at the lower edge of the eject plate 22. A first contact portion 22d protruding downward is formed at the right corner of the lower edge of the eject plate 22. A vertically long engagement groove 22e is formed on the right edge of the eject plate 22. The main chassis is on the upper edge of the eject plate 22.
A hook portion 22f that is bent rightward after extending toward the upper edge of the hook 10 is formed, and a second contact portion 22g that projects further forward is formed on the front surface of the hook portion 22f. .

A stop plate 26 made of synthetic resin is arranged on the rear surface of the main chassis 10 on the right side of the eject plate 22. A stop button 28 made of synthetic resin is detachably attached to the upper edge of the stop plate 26 by snap engagement, and the stop button 28 projects upward from the upper edge of the main chassis 10. The lower edge of the stop plate 26 is branched into two, and a vertically elongated first guide hole 26a is formed in the end region of the left branch portion. In the first guide hole 26a,
On the back surface of the main chassis 10, a cylindrical fixed pin 30 made of synthetic resin and outsert molded is inserted. The right side of the end region of the right branch portion of the lower edge of the stop plate 26 is formed as a first sliding contact surface 26b inclined downward to the left. An area between the left branch portion and the right branch portion of the lower edge of the stop plate 26 is formed as a second sliding contact surface 26c having a substantially inverted V shape. A vertically long second guide hole 26d is also formed at the upper edge of the stop plate 26. A synthetic resin guide pin 32, which is outsert-molded on the back surface of the main chassis 10, is inserted into the second guide hole 26d. A hook 32a is formed at the protruding end of the guide pin 32. On the left edge of the left branch of the lower edge of the stop plate 26, there is formed an engaging projection 26e projecting obliquely upward to the left, and the engaging projection 26e projects into the engaging groove 22e on the right edge of the eject plate 22. By engaging with the upper edge of the engaging groove 22e, the eject plate 22 is prevented from moving below the position shown in FIG. The lifting guide hole 22a is also prevented from coming off the fixing pin 24. A downward engaging step portion 26f is formed at an upper end portion of the left edge of the stop plate 26, and the engaging step portion 26f is formed.
Is closer to the right end portion of the upper edge of the hook portion 22f of the eject plate 22 from above and faces the right end portion with a slight gap.

A biasing means (not shown) is disposed between the stop plate 26 and the surface side of the main chassis 10 not shown, and the biasing means moves the stop plate 26 upward from the upper edge of the main chassis 10. The first and second guide holes of the stop plate 26 are urged to pop out.
Fixed pin 30 and guide pin 32 inserted through 26a and 26d
Prevents the above jump out.

A play plate 34 made of synthetic resin is arranged on the right side of the stop plate 26 on the back surface of the main chassis 10. A vertically long guide hole 36 is also formed in the play plate 34, and a guide pin 38 made of synthetic resin out-molded on the back surface of the main chassis 10 is inserted into the guide hole 36. A hook facing downward is formed at the front end of the guide pin 38, and the play plate 34 made of synthetic resin inserts the guide pin 38 into the guide hole 36 by pushing the guide hole 36 onto the guide pin 38. Both main chassis 10 by the hook at the front end of the guide pin 38
Is prevented from being separated from the back surface. Play plate
An engaging protrusion 40 having a substantially inverted T-shape is formed at the lower edge of the protrusion 34 so as to protrude downward. An engaging step portion 40a having an upward engaging surface extending in the left-right direction is formed at the right end edge of the laterally long portion of the engaging projection 40, and the upper edge of the leftward extending region of the laterally long portion descends to the left. The engaging surface 40b is formed with an inclination. On the front surface of the play plate 34, a floating prevention protrusion 42 protruding downward along the back surface of the main chassis 10 is formed. A downward click plate engagement step portion 34a is formed on the right edge of the play plate 34.

On the surface side (not shown) of the main chassis 10, a metal head support plate (not shown) is arranged at a position corresponding to the play plate 34, and the play plate 34 and the head support plate are formed on the main chassis 10. Are connected so as to move integrally with each other by a connecting screw (not shown) inserted through an opening (not shown). A magnetic head is mounted on a metal head support plate (not shown) through an azimuth adjusting device (not shown). A biasing means (not shown) is interposed between a head support plate (not shown) and a surface side of the main chassis 10 (not shown). Although the head support plate which is not formed is urged upward from the upper edge of the main chassis 10, the guide pin 38 inserted in the guide hole 36 of the play plate 34 has the play plate 34 and the play plate 34 from the upper edge. A head support plate (not shown) is prevented from popping out.

Play button 44 made of synthetic resin on the upper edge of the play plate 34
Is detachably attached by snap engagement,
The play button 44 projects upward from the upper edge of the main chassis 10.

A pinch roller lever (not shown) having a rotation center at a position substantially corresponding to the boundary between the play plate 34 and the stop plate 26 is further arranged on the surface side (not shown) of the main chassis 10. The pinch roller lever rotatably supports a pinch roller (not shown) at one end, and the other end from the front side to the back side of the main chassis 10 through an opening (not shown) formed in the main chassis 10. And ejector lever drive pin 46 is formed. A pinch roller lever (not shown) is rotated by an urging means (not shown) in conjunction with a head support plate (not shown) and the play plate 34.

In the state shown in FIG. 9 in which the play button 44 is not pressed against the biasing means (not shown), the eject lever drive pin 46 of the pinch roller lever (not shown) is shown.
Is in contact with the right edge of the eject lever 22.

On the back surface of the main chassis 10, on the right side of the play plate 34, a guide pin 48 made of synthetic resin outsert molded on the back surface is located. Guide pin 48
A hook 48a facing upward is formed at the front end of the.

On the back surface of the main chassis 10, in the area near the lower edge of the right edge, an erasure prevention lever 50 made of synthetic resin that is elongated vertically
The erroneous erasure prevention lever 50 is rotatably supported on a guide pin 52 made of a synthetic resin, the substantial center portion of which is outsert-molded on the back surface of the main chassis 10. A hook 52a facing leftward is formed at the front end of the guide pin 52. The front end of the erasure prevention lever 50 is formed with an engagement protrusion 50a that projects forward from the rear surface of the main chassis 10, and the rear end of the erasure prevention lever 50 has a right end of the main chassis 10 at the lower end. An erroneous erasure prevention claw 50b is formed which protrudes to the front surface side of the main chassis 10 outside the edge and extends to the front surface side of the right edge of the main chassis 10.

A guide pin 54 made of synthetic resin outsert-molded on the back surface of the main chassis 10 is arranged on the back surface of the main chassis 10 on the left side of the erasure prevention lever 50. At the front end of the guide pin 54, the hook 54 facing to the right
a is formed.

A record mode setting switch drive lever 56 made of synthetic resin is rotatably supported on the guide pin 54. The record mode setting switch drive lever 56 is a guide pin
Engaged protrusion 56a that protrudes diagonally downward to the right around 54
And a spring portion 56b that is bent in the clockwise direction after protruding downward. An engagement pin 56c protruding forward is formed at the extending end of the spring portion 56b.

The engagement pin 56c has a record mode setting switch on a circuit board (not shown) arranged so as to face the back surface of the main chassis 10 in a housing (not shown) of the tape recorder.
A pair of elastic contact pieces 58a of 58 are in contact with each other.

On the back surface of the main chassis 10, on the left side of the guide pin 54, a rotation center shaft 60 made of synthetic resin outsert-molded on the back surface of the main chassis 10 is arranged.

On the back surface of the main chassis 10, a spring holding member 64 made of a synthetic resin holding a tape cassette positioning leaf spring 62 is outsert-molded at the substantially center of the lower edge in the left-right direction.

On the rear surface of the main chassis 10, between the left branch portion and the right branch portion of the lower edge of the stop plate 26, a capstan bearing 66 made of synthetic resin and outsert-molded on the rear surface is arranged.

A synthetic resin take-up reel shaft gear 70 is arranged on the back surface of the main chassis 10 below the left branch portion of the lower edge of the stop plate 26, and the take-up reel shaft gear 70 is on the back surface of the main chassis 10. It is rotatably supported by a shaft support 72 made of synthetic resin and outsert molded. The take-up reel shaft gear 70 is shown with respect to a take-up reel shaft (not shown) made of synthetic resin and protruding toward the front surface side of the main chassis 10 through an opening (not shown) formed in the main chassis 10. It is connected through a known slip mechanism that is not provided.

A spring engagement special feature 72a is formed on the front surface of the shaft support base 72 below the center of rotation of the take-up reel shaft gear 70.

A counter drive gear 76 made of synthetic resin rotatably attached to a rotation center shaft 74 made of synthetic resin outsert molded on the back surface of the main chassis 10 is located on the left side of the shaft support 72. Cage, counter drive gear
A counter drive gear 76 drives a known tape counter (not shown) arranged on the surface side (not shown) of the main chassis 10.

On the rear surface of the main chassis 10 and below the counter drive gear 76, a cylindrical spring support pin 78 made of synthetic resin and outsert molded on the rear surface is arranged.

On the back surface of the main chassis 10, on the right side of the shaft support 72, there is arranged an idler lever 80 made of synthetic resin and extending vertically. The upper end of the idler lever 80 is rotatably mounted on the outer peripheral surface of the capstan bearing 66, and a synthetic resin idler gear 82 is rotatably mounted on the front surface of the idler lever 80 at a substantially central position in the vertical direction. Has been. The rotation center shaft 84 of the idler gear 82 is also made of synthetic resin, and the rear end of the rotation center shaft 84 has a hook shape. The hook-shaped rear end is the main chassis 10
The main chassis 10 is snap-engaged with an arcuate opening formed concentrically with respect to the capstan bearing 66.
The idler lever 80 is prevented from coming off the back surface of the.

There is a spring stop protrusion 80a formed on the lower end of the idler lever 80 and a spring stop protrusion 86 made of synthetic resin outsert molded on the back surface of the main chassis 10 on the left side of the lower end of the idler lever 80. A compression coil spring 88 is stretched in between, and the urging force of the compression coil spring 88 urges the idler lever 80 around the capstan bearing 66 in the clockwise direction. Due to this biasing force, the idler gear 82 on the idler lever 80 turns the take-up reel shaft gear.
70 is engaged from the right side.

The left edge of the idler lever 80 constitutes a contact surface 80b that is inclined toward the lower left in the vicinity of the capstan bearing 66.

A supply reel shaft support lever 90 made of synthetic resin is arranged on the right side of the idler lever 80 on the back surface of the main chassis 10. The supply reel shaft support lever 90 has a hook-shaped rear end portion of a synthetic resin rotation center shaft 90a formed substantially in the center of the upper half portion formed on the back surface of the main chassis 10 (not shown). By being snap-engaged with the engagement hole, the main chassis 10 can be rotated around the rotation center axis 90a along the back surface without being separated from the back surface. An idler gear 92 made of synthetic resin is rotatably supported on the rotation center shaft 90a.

A supply reel shaft gear 94 made of synthetic resin is rotatably supported on the rear half of the lower half portion of the supply reel shaft support lever 90, and the supply reel shaft gear 94 meshes with an idler gear 92.

The supply reel shaft gear 94 is connected to the main chassis 10 through an opening (not shown) formed in the main chassis 10.
Is connected to a supply reel shaft (not shown) made of synthetic resin and protruding to the surface side of the.

A first engaging projection 90b is formed at the upper end of the left edge of the supply reel shaft support lever 90 so as to project rearward toward the back surface of the main chassis 10. The left edge of the supply reel shaft support lever 90 is formed with an idler lever pressing projection 90c extending leftward to the front surface of the lower end portion of the idler lever 80. The lower edge of the supply reel shaft support lever 90 is formed with a second engaging projection 90d that projects downward.
The engaging projection 90d is engaged with the engaging pin 96, which is made of synthetic resin and is outsert molded on the back surface of the main chassis 10, from the right side. On the right edge of the supply reel shaft support lever 90, an engaging surface 90e that is inclined obliquely downward to the right is formed.

On the right edge of the main chassis 10 on the back surface of the main chassis 10, there is arranged a record plate 98 extending vertically along the right edge of the main chassis 10, as shown in FIG.

A guide hole 98a extending vertically is formed at the upper end of the record plate 98, and the guide pin 48 shown in FIG. 9 is inserted into the guide hole 98a. A guide hole that extends vertically also at the lower end of the record plate 98
98b is formed, the guide pin 52 shown in FIG. 9 is press-fitted into the guide hole 98b, and the hook 52a at the front end of the guide pin 52 prevents the guide hole 98b from being separated from the guide pin 52. There is.

In this embodiment, the width of the vertically long region located on the right side of the guide hole 98b at the lower end of the record plate 98 is much narrower than the width of the vertically long region located on the left side of the guide hole 98b at the lower end. When the guide pin 52 with the hook 52a is press-fitted into the guide hole 98b, the guide pin 52 bends to facilitate the press-fitting.

As shown in FIG. 10, the record plate 98 in which the guide pin 48 and the guide pin 52 with the hook 52a are inserted into the pair of upper and lower guide holes 98a, 98b is overlapped on the erasure prevention lever 50.

Main chassis 10 from the bottom edge of the record plate 98
A spring retaining protrusion 98c is formed further protruding rightward from the right edge of the. A tension coil spring 100 is stretched between the spring retaining protrusion 98c and a position above the spring retaining protrusion 98c on the right edge of the main chassis 10, and the tension coil spring 100 biases the record plate 98. Is urged upward, but a pair of upper and lower guide holes 98a, 98b
The guide pin 48 and the guide pin 52 inserted in the block prevent the record plate 98 from protruding from the upper edge of the main chassis 10. The biasing force of the tension coil spring 100 also causes the record plate 98 to rotate in the counterclockwise direction, and this rotation force causes the record plate 98 to rotate.
Contacts the lower guide pin 52 with a wide and sturdy vertically elongated region located at the lower end on the left side of the guide hole 98b.

At the left edge of the lower end of the record plate 98, a pocket 98d into which the engaged projection 56a of the record mode setting switch drive lever 56 shown in FIG. 9 is inserted is formed.

A first opening 102, into which the engaging projection 50a of the erroneous erasure prevention lever 50 is inserted, is formed at a substantially central portion in the vertical direction of the record plate 98. On the right edge of the first opening 102,
A downward engaging step 102a is formed so as to oppose the upper edge of the engaging protrusion 50 of the erroneous erasure prevention lever 50.

The record plate 98 also has an upper guide hole 98a.
Between the first opening 102 and the second opening 104 having a substantially U shape.
Are formed. An upward engaging step portion 104a is formed on the left edge of the second opening 104.

The record plate 98 is further formed with a guide groove 106 having a substantially right-angled triangular shape on the front side above the upper guide hole 98a. The guide groove 106 has an engagement narrow groove 106a extending further upward from the upper end.

A record button 108 made of synthetic resin is detachably attached to the upper edge of the record plate 98 by snap engagement, and the record button 108 projects upward from the upper edge of the main chassis 10.

The first opening 102 on the left edge of the front of the record plate 98
A rotation restricting wall 98e extending vertically from the left side to a position corresponding to the lower end of the second opening 102 along the left edge and protruding forward is formed.

In FIG. 2, only the record plate 98 is shown alone to facilitate understanding of the above-mentioned record plate 98.

Record plate 98 facing the back of the main chassis 10
An erasing head (not shown) protruding to the surface side of the main chassis 10 is fixed to the rear surface of the main chassis 10 through an opening (not shown) formed in the main chassis 10.
On the surface side, the erasing head (not shown) is located alongside the magnetic head (not shown) that is interlocked with the play plate 34.

At the upper end of the left edge of the record plate 98, a downward engaging step portion 112 that engages from above with an upward engaging step portion 110 formed at the upper edge of the right edge of the play plate 34 is formed. ing.

The rotation center shaft 60 located at the lower right corner on the back surface of the main chassis 10 has a cylindrical bearing formed in the downward bent portion of the play hook lever 114 made of synthetic resin and having a substantially U shape. The portion 114a is rotatably attached. A play hole 116 through which the guide pin 54 adjacent to the right side of the rotation center shaft 60 is inserted is formed in the lower bent portion. A torsion coil spring 118 is wound around the bearing 114a,
One end thereof is hooked on the upper edge of the lower lateral side portion 114b of the play hook lever 114. The left edge of the upper lateral side portion 114c of the play hook lever 114 is an abutted surface 114d that is inclined upward and diagonally downward to the left. Play hook lever 114
A hook 114e that is bent upward to the left is formed at the upper bent portion of the hook. The hook 114e projects forward from the front surface of the play hook lever 114.
The upper bent portion projects further to the right and extends a gap between the rear surface of the record plate 98 and the back surface of the main chassis 10 to extend below the engagement step 104a in the second opening 104 of the record plate 98. The pressing protrusion 114f reaching the is formed.

The right edge of the play hook lever 114 is the record plate 98.
Of the play hook lever 114 in this state.
14d opposes the downward first sliding contact surface 26b at the end of the right branch of the lower edge of the stop plate 26 located diagonally above and to the left. Also in this state, the play hook lever 114
The tip of the hook 114e is located on the left side of the downward sliding contact surface 40a on the engaging protrusion 40 at the lower edge of the play plate 34.

In FIG. 4, only the play hook lever 114 is shown alone to facilitate understanding of the play hook lever 114 described above.

A synthetic resin record lever 120 extending vertically is rotatably supported at the upper end of the front surface of the record plate 98 by the guide pin 48 inserted into the guide hole 98a above the record plate 98. There is. The lower end of the record lever 120 extends to the right of the engaging step 104a of the second opening 104 of the record plate 98, and the lower end has a front engaging projection 120a protruding forward and a second opening. And a rear engagement protrusion 120b that protrudes rearward toward. The upper end portion of the record lever 120 constitutes an elongated spiral spring portion 120c which is curved in a counterclockwise direction after extending obliquely upward to the left from the guide pin 48, and the record spring is formed at the tip of the spiral spring portion 120c. An engaging pin 120d inserted into the left corner of the guide groove 106 at the upper end of the plate 98 is formed.

In FIG. 3, only the record lever 120 is shown alone to facilitate understanding of the record lever 120 described above.

As shown in FIG. 11, the center hole of the cylindrical fixing pin 30 shown in FIG. 9 inserted into the first guide hole 26a of the left branch portion of the lower edge of the stop plate 26 is moved vertically as shown in FIG. An unillustrated rotation center shaft of the extended REW / FF lever 122 made of synthetic resin is inserted. A hook is formed at the tip of the rotation center shaft (not shown), and the hook corresponds to the center hole when the rotation center shaft (not shown) is inserted into the center hole of the fixing pin 30. It snaps into an opening (not shown) of the formed main chassis 10. The hook prevents the rotation center shaft from being disengaged from the center hole, and the REW / FF lever 122 disengages the first guide hole 26a of the left branch portion of the lower edge of the stop plate 26 from the fixing pin 30. Is also prevented.

The upper end of the REW / FF lever 122 is enlarged and the rotation connecting part 122
and a left edge of the lower end portion constitutes a pressing surface 122b. The pressing surface 122b faces the first contact portion 22d on the right side of the first contact portion 22d of the eject plate 22.

The REW / FF lever 122 has an engaging projection 122c formed on the right edge thereof so as to project rearward, and the engaging projection 122c is in contact with the contact surface 80b at the upper end of the left edge of the idler lever 80.

In FIG. 5, only the REW / FF lever 122 is shown alone in order to facilitate understanding of the REW / FF lever 122 described above.

FIG. 12 shows a synthetic resin trigger lever 124 having a lower end rotatably mounted on a guide pin 54 located at the lower right corner of the back surface of the main chassis 10 and extending in the vertical direction. Trigger lever 124 is play hook lever 1
It overlaps with the front surface of 14, extends upward from the guide pin 54 along the play hook lever 114, and further extends leftward along the upper lateral side portion 114c of the play hook lever 114. The left extended end of the trigger lever 124 is the stop lever 2
The abutting portion 124a is formed to reach the front of the first sliding contact surface 26b of the right branch portion of the lower edge of the 6, and the front surface of the left extending end projects toward the front. An upward projecting portion 124b projecting upward is formed at the left extending end, and the upward projecting portion 124b is formed.
A rotation restricting protrusion 124c protruding rearward is formed on the rear surface of 124b. The rotation restricting protrusion 124c engages with the upward engaging surface 40b of the end of the engaging protrusion 40 at the lower edge of the play plate 34 from above, and in this state, the trigger lever 124 and the right edge of itself and the record plate 98. Rotation restriction wall 98e on the left edge of
Rotation to the right (that is, clockwise direction) is restricted with a gap left between and.

The rising prevention protrusion 42 of the play plate 34 overlaps with the front surface of the upward protrusion 124b, and the rising prevention protrusion 42
Is the trigger lever 124 from the front of the play hook lever 114.
And the trigger lever from the guide pin 54
It prevents the departure of 124.

On the left edge of the trigger lever 124, an abutting protrusion 124 that protrudes leftward from the left edge and abuts on an engaging surface 90e on the right edge of the supply reel shaft support lever 90 located on the left side of the trigger lever 124.
d is formed, and a rotation return pin 124e protruding forward is formed on the front surface of the contact protrusion 124d.

In FIG. 6, only the trigger lever 124 is shown alone to facilitate understanding of the above-mentioned trigger lever 124.

On the front surface of the trigger lever 124, a click plate 126 made of synthetic resin extending in the vertical direction is arranged so as to overlap. A first guide hole 126a extending vertically is formed at the lower end of the click plate 126, and the guide pin 54 located at the lower right corner of the back surface of the main chassis 10 is formed in the first guide hole 126a. It has been inserted. Guide pin 54
The hook 54a at the front end of the hook engages with the outer edge of the first guide hole 126a on the front surface of the click plate 126 to prevent the guide hole 126a from being separated from the guide pin 54.

The width of the vertically long region located on the right side of the first guide hole 126a at the lower end is equal to the width of the first guide hole 126a at the lower end.
Is much narrower than the width of the vertically long region located on the left side of the guide pin 54, and when the guide pin 54 with the hook 54a is press-fitted into the first guide hole 126a, the guide pin 54 bends to facilitate the press-fitting.

A second guide hole 126b extending vertically is formed at the upper end of the click plate 126, and a guide pin 48 located at the upper right corner of the back surface of the main chassis 10 is formed in the second guide hole 126b. It has been inserted.

An arm portion 126c extending leftward is formed at the lower end portion of the click plate 126, and the arm portion 126c has a main chassis.
A spring receiving protrusion 126d is formed which protrudes rearward toward the back surface of 10. The main chassis 10 is attached to the spring receiving protrusion 126d.
One end of the torsion coil spring 128 wound around the spring support pin 78 located at the lower left corner of the back surface of the is engaged from below. The other end of the torsion coil spring 128 is engaged with the central spring holding member 64 at the lower edge of the back surface of the main chassis 10,
The torsion coil spring 128 biases the click plate 126 upward. Click plate with the above bias
The protrusion of 126 upward is prevented by the guide pins 54 and 48 inserted into the first and second guide holes 126a and 126b of the click plate 126.

As described above, one end of the torsion coil spring 128 engages from below with the spring engagement projection 72a on the shaft support 72 when the click plate 126 is arranged at the upper end position of its movement range, and the torsion coil spring 128 is twisted. All of the urging force of the coil spring 128 is applied to the spring receiving projection 126d of the arm 126c of the click plate 126 made of synthetic resin for a long period of time, and the spring receiving projection 126d is loaded.
It is prevented that the 126d and the arm portion 126c are deformed.

At the upper end of the left edge of the click plate 126, an elongated elastic engagement protrusion 130 extending diagonally upward to the left is formed,
At the end of the elastic engaging protrusion 130, a first engaging recess 130 facing upward is formed.
a is formed.

An upper second engaging recess 126e is formed at the upper end of the click plate 126, and the first engaging recess 130a and the second engaging recess 126e at the end of the elastic engaging protrusion 130 are different from each other. They are located on the same straight line in the left-right direction.

On the rear surface of the click plate 126, at a position substantially corresponding to the base end of the elastic engagement protrusion 130, a driven pin protruding rearwardly.
126f is formed. The driven pin 126f is engaged with the downwardly facing click plate engaging step portion 34a of the right edge of the play plate 34 from below.

In FIG. 7, only the click plate 126 is shown alone in order to facilitate understanding of the click plate 126 described above.

On the front surfaces of the eject plate 26, the play plate 34, and the click plate 126, as shown in FIG. 1, slide plates 132 extending in the left-right direction along the upper edge of the main chassis 10 are arranged in an overlapping manner. .

A first guide hole 132a extending in the left-right direction is formed at the right end of the slide plate 132. A guide pin 48 located at the upper right corner of the back surface of the main chassis 10 is press-fitted into the first guide hole 132a. Guide pin 48
The hook 48a at the front end of the
Engages with the upper edge of the guide hole 132a to prevent the first guide hole 132a from coming off the guide pin 48.

A second guide hole 132b extending in the left-right direction is also formed in the substantially central portion of the slide plate 132 in the left-right direction. A guide pin 32, which is located substantially at the center of the upper edge of the main chassis 10 in the left-right direction, is press-fitted into the second guide hole 132b. The hook 32a at the front end of the guide pin 32 engages with the lower edge of the second guide hole 132b on the front surface of the slide plate 132, and the second guide hole 13 from the guide pin 32
It prevents the separation of 2b. The slide plate 132 is formed with an elongated hole 134 extending in the left-right direction below the second guide hole 132b and extending substantially parallel to the second guide hole 132b. In the slide plate 132, the region between the hole 134 and the second guide hole 132b has a narrow vertical width, which is smaller than that of the guide pin 32 with the hook 32a.
The press-fitting is facilitated by elastically bending the guide hole 132b.

The slide plate 132, which is prevented from being separated from the guide pins 32, 48 by the hooks 32a, 48a of the pair of guide pins 32, 48, overlaps with the eject plate 26, the play plate 34, and the front surface of the click plate 126. These various plates also prevent the various plates from floating above the back surface of the main chassis 10. In addition, the click plate 126 has a trigger lever 124, a play hook lever 114, and a record plate on the back surface.
These various levers and plates are also prevented from floating above the rear surface of the main chassis 10 by the slide plate 132 because they are arranged so as to overlap with each other on the front surface of 98.

A record lever drive protrusion 132c protruding downward is formed on the lower edge of the right end portion of the slide plate 132, and the record lever drive protrusion 132c is located on the left side of the front engaging protrusion 120a at the lower end portion of the record lever 120 and engages with the front engagement. It opposes the compound protrusion 120a.

At the upper edge of the rear surface of the slide plate 132, the first and second engaging recesses 130a, 12 at the upper end of the click plate 126 are formed.
A click pin 136 protruding downward is formed between 6e.

On the upper edge of the rear surface of the slide plate 132, a sliding contact wall 132d extending further in the left-right direction is formed.
A guide pin 38 for the play plate 34 is in contact with the lower edge of 2d from below.

A connecting recess 132e is formed at the lower edge of the central portion of the slide plate 132 in the left-right direction, and the REW / FF lever 12 located on the left side of the capstan bearing 66 is formed in the connecting recess 132e.
The rotation connecting portion 122a at the upper end of 2 is inserted.

A driven projection 132f that projects rearward toward the back surface of the main chassis 10 is formed at the lower edge of the substantially central portion of the slide plate 132 in the left-right direction.
132f is located in the space surrounded by the inverted V-shaped second sliding contact surface 26c at the lower edge of the stop plate 26.

On the rear surface of the left end portion of the slide plate 132, an engagement step portion 132g having an abutting surface extending in the vertical direction is formed, and the engagement step portion 132g is the second hook portion 22f of the upper end of the eject plate 22. The second contact portion on the right side of the contact portion 22g of
Facing 22g.

At the left end of the slide plate 132, the main chassis 10
An elongated elastic extension 138 is formed to extend downward along the back surface of the. The elastic extension 138 is in contact with the right edge of the motor support frame 12 on the left edge of the main chassis 10 from the right side.

An elastic extension 1 is further provided on the left end of the slide plate 132.
A switch drive protrusion 140 is formed so as to protrude downward from the right side of 38 along the back surface of the main chassis 10.

Positioned between the switch driving protrusion 140 and the elastic extension 138 is a pair of elastic contact pieces 142a of the motor high speed rotation switch 142 on the circuit board (not shown) in the housing (not shown) of the tape recorder. ing.

A REW / FF button 144 is formed on the upper edge of the slide plate 132 so as to project upward from the upper edge of the main chassis 10 from a substantially central portion in the left-right direction.

In FIG. 8, only the slide plate 132 is shown alone to facilitate understanding of the slide plate 132 described above.

A capstan 146 is inserted into a capstan bearing 66 located at the approximate center of the back surface of the main chassis 10. A rear end of the capstan 146 largely projects to the front surface side of the main chassis 10, and a flywheel 148 made of synthetic resin is concentrically fixed to the front end located on the back surface side of the main chassis 10. Grooves are dug over the entire circumference of the flywheel 148. This groove on the circumference of the flywheel 148 and the output shaft pulley of the motor 14 shown in FIG.
The power transmission belt 150 shown in FIG. 1 is stretched between the groove on the peripheral surface of 14a.

Flywheel 14 facing the back of the main chassis 10
8 on the rear surface of the trigger lever 124 at a position radially outward of the abutting portion 124f at the upper end of the trigger lever 124.
8a is formed.

In this embodiment, each of the trigger lever drive pin 148a and the abutting portion 124f has a substantially wedge shape. Then, in the trigger lever drive pin 148a on the flywheel 148, the acute-angled end in the wedge shape faces the counterclockwise direction in the circumferential direction centered on the capstan 146, and in the abutting portion 124f on the trigger lever 124. The acute-angled end of the wedge shape faces the clockwise direction in the circumferential direction.

Also in this example, the trigger lever drive pin 148a
The outer peripheral edge located radially outward of the bulge has an outward curved shape that bulges outward in the radial direction, and at the abutting portion 124f, the inner peripheral edge located radially inward bulges outward in the radial direction. It has an outward curved shape.

A flywheel output gear 152 is formed concentrically with the capstan 146 on the rear surface of the flywheel 148, and the flywheel output gear 152 meshes with the idler gear 82 on the idler lever 80.

The main chassis 10 of the tape recorder having the structure as described in detail with reference to FIGS. 1 to 13 above.
Various plates, levers and other members on the back surface of the tape will be described in detail below with reference to FIGS. 14 to 22 when various modes are set in the tape recorder.

Before using the tape recorder, a tape cut (so-called micro-cut in this embodiment) is attached to a predetermined position on the front surface side of the main chassis 10. If the erroneous erasure prevention pawl (not shown) of the tape cassette is not folded, the erroneous erasure prevention pawl detection protrusion 50b shown in FIG. 9 of the erroneous erasure prevention lever 50 at the lower end of the right edge of the back surface of the main chassis 10 is shown. By contacting the erroneous erasure prevention claw, the erroneous erasure prevention lever 50 rotates counterclockwise around the guide pin 52, which is the center of rotation, as shown in FIG. The record plate 98 is moved to the left from the lower position of the engagement step 102a in the first opening 102.

Next, as shown in FIG. 14, when the play button 44 is pressed downward, the play button 44 is interlocked with the play plate 34 on the front surface side of the main chassis 10 on a magnetic head support plate (not shown). It starts moving downward against the biasing force of the torsion coil spring.

The play plate 34 moving downward is a driven pin of the click plate 126 on the right edge of the click plate engaging step 34a.
This is engaged with 126f, whereby the click plate 126 also moves downward against the biasing force of the torsion coil spring 128 which is engaged with the spring receiving projection 126d of the lower arm 126c. The spring receiving projection 126d of the arm 126c of the click plate 126 moving downward is also engaged with the torsion coil spring 118 wound around the rotation center of the play hook lever 114,
This causes the play hook lever 114 to rotate in the counterclockwise direction around the rotation center shaft 60 at the lower end, and the engaging projection on the lower edge of the play plate 34 that has moved downward as described above.
The hook 114e is engaged with the engagement step portion 40a of the 40 to hold the play plate 34 in the position as shown in FIG. The position of the play plate 34 at this time is set as the play mode setting position of the play plate 34.

When the play plate 34 is placed in the play mode setting position, the magnetic head on the magnetic head support plate (not shown) is inserted into the magnetic head insertion window of the tape cassette and comes into contact with the magnetic recording tape. The above-mentioned pinch roller lever (not shown), which is interlocked with the magnetic head support plate by the above-mentioned torsion coil spring (not shown), also inserts a pinch roller (not shown) into the pinch roller insertion window of the tape cassette. The magnetic recording tape is sandwiched in cooperation with a capstan projecting to the surface side of the main chassis 10.

Play plate 34 placed at the play mode setting position
Turns on the play mode setting switch (not shown) on the circuit board in the housing (not shown) of the tape recorder. As a result, the magnetic head (not shown) on the magnetic head supporting plate functions as a reproducing head.
Further, the motor 14 shown in FIG.
Is rotated clockwise at a predetermined speed. This rotation of the output shaft pulley 20 is transmitted to the flywheel 148 by the power transmission belt 150 shown in FIG. 1 to rotate the flywheel 148 clockwise at a predetermined speed. During this time, the trigger lever drive pin 148a on the rear surface side of the flywheel 148 moves radially outward of the abutting portion 148a at the upper end portion of the trigger lever 124 and does not abut the abutting portion 148a.

Flywheel 148 rotation is flywheel output gear 1
It is transmitted to the take-up reel shaft gear 70 via 52 and an idler gear 82 which is constantly meshed with the take-up reel shaft gear 70, and rotates the take-up reel shaft gear 70 in a clockwise direction at a predetermined speed as shown by an arrow in FIG. . Flywheel 14 from idler gear 82
Supply reel shaft gear that rotates freely without inputting 8 rotations 9
(4) A supply reel hub (not shown) mounted on the supply reel shaft (not shown) holds the magnetic recording tape in cooperation with a pinch roller (not shown) and rotates in the same direction as the flywheel 148 at a predetermined speed. The magnetic recording tape is delivered at a predetermined speed by a capstan (not shown). The take-up reel hub (not shown) mounted as described above on the take-up reel shaft (not shown) on the take-up reel shaft gear 70 to which the rotation from the flywheel 148 is transmitted as described above is located between the capstan and the pinch roller. The magnetic recording tape sent out at a predetermined speed is wound up. The difference between the peripheral speed of the outermost magnetic recording tape on the take-up reel hub and the above-mentioned predetermined speed when it is fed from between the capstan and the pinch roller is the take-up reel shaft and take-up reel shaft gear. It is eliminated by a known slip mechanism interposed between the slip and 70.

As shown in FIG. 15, the eject lever driving pin 46 on the pinch roller lever (not shown) arranged in the play mode setting position presses the right edge of the eject lever 22 to move the eject lever 22 to the first position. It is rotated counterclockwise around the fixing pin 24 against the elastic force of the spring portion 22b. As a result, the hook portion 22f at the upper edge of the eject lever 22 is engaged with the engaging step portion 2 at the upper edge of the left edge of the stop plate 26.
Move to the left from the lower position of 6f.

By disposing the play plate 34 at the play mode setting position, the rotation restricting protrusion 124c on the rear surface of the upper end portion of the trigger lever 124 to the engaging surface of the engaging protrusion 40 of the play plate 34.
40b is separated downward, and the trigger lever 124 can rotate in the clockwise direction around the rotation center shaft 60 that is the rotation center.

Following the press of the play button 44 described above, the record button 108
When the record plate 98 is pressed, the engagement protrusion 50a of the erroneous erasure prevention lever 50 is moved to the left from the position below the engagement step 102a in the first opening 102 of the record plate 98.
Can move downward against the biasing force of the tension coil spring 100.

As is clear from the above description, when the erroneous erasure prevention claw of the tape cassette (not shown) mounted at a predetermined position on the front surface side of the main chassis 10 is broken, the erroneous erasure prevention lever 50 shown in FIG. Accidental erasure prevention protrusion detection protrusion 50 shown in
Since the b does not contact the accidental erasure prevention claw, the accidental erasure prevention lever 50
Does not rotate in the counterclockwise direction around the guide pin 52 that is the center of rotation, and the engagement protrusion 50a at the upper end of the guide pin 52 from the position below the engagement step 102a in the first opening 102 of the record plate 98. Do not move to. As a result, the downward movement of the record plate 98 is blocked by the engagement of the engagement stepped portion 102a in the first opening 102 with the engagement protrusion 50a of the erroneous erasure prevention lever 50, and the tape recorder is prevented. Cannot set the record mode described later.

To move the record plate 98 downward, the record lever 120 having the engagement pin 120d at the tip of the coil spring 120c inserted in the guide groove 106 at the upper end of the record plate 98 is rotated clockwise around the guide pin 48. The front engaging projection 120a at the lower end of the record lever 120 is engaged with the engaging step 104a in the second opening 104 of the downwardly moved record plate 98. This engagement is the coil spring part
The engagement pin 120d at the tip of the 120c engages with the engagement narrow groove 106a at the upper end of the guide groove 106 to stabilize the engagement. The engagement also causes the record plate 98 to pull the coil spring 10
It is held in the position shown in FIG. 16 against the biasing force of zero. The position of the record plate 98 at this time is the record plate
It is called the 98 record mode setting position. Record plate
98 is arranged in the record mode setting position by mounting the above-mentioned erasing head (not shown) which is interlocked with the record plate 98 on the front surface side of the main chassis 10 at a predetermined position on the front surface side of the main chassis 10 as described above. The tape is inserted into the magnetic head insertion window of the tape cassette and brought into contact with the magnetic recording tape.

The downward movement of the record plate 98 also causes the record mode setting switch drive lever 56 to engage the engaged projection 56a in the pocket 98d at the lower end of the left edge of the record plate 98 as shown in FIG. The record mode setting switch drive lever 56 rotated in such a clockwise direction is rotated by the engaging pin 56c of the spring portion 56b as shown in FIG. Press the contact piece 58a to press the record mode setting switch 58.
Is turned on.

When the record mode setting switch 58 is turned on, the aforementioned magnetic head (not shown) interlocked with the play plate 34 which has been moved to the play mode setting position previously functions as a recording head.

The play plate 34 is first moved to the play mode setting position and the magnetic recording tape in the tape cassette is mounted on the supply reel shaft (not shown) corresponding to the supply reel shaft gear 94 and wound from the supply reel hub (not shown). The erasing head (not shown) is in contact with the take-up reel hub (not shown) mounted on the take-up reel shaft (not shown) corresponding to the take-up reel shaft gear 70 because it is traveling at a predetermined speed. A magnetic head (not shown) as a recording head records information on the magnetic recording tape.

In the above description, while the play plate 34 is moving to the play mode setting position first, the record plate 34
The record mode is set by pressing 98 for setting the record mode. However, at the operation releasing position shown in FIG. 1, the engaged step portion 110 at the upper end of the right edge of the play plate 34 is set to the first position. As shown in FIG. 10, the engagement step 112 at the upper end of the left edge of the record plate 98 is engaged. Therefore, both play plate 34 and record plate 98 are first
As shown in the figure, when the record plate 98 is moved downward in the operation release position, the play plate 34 also moves to the play mode setting position in the same manner as the play mode setting described above. Is held at the play mode setting position, and at the same time, the record plate 98 is moved to the record mode setting position and held at the record mode setting position in the same manner as when the record mode is set.

When the stop button 28 is pressed while the record mode is set as shown in FIG. 16, the stop plate 26
Is moved downward against the urging force of the aforementioned urging means (not shown) interposed between the main chassis 10 and the first sliding contact surface 26b at the end of the right branch portion at the lower edge thereof, The hook 114e is engaged with the engagement step portion 40a of the engagement protrusion 40 of the play plate 34, and abuts on the abutted surface 114d at the upper leftward extension end of the play hook lever 114. As a result, the play hook lever 114 resists the biasing force of the torsion coil spring 118 pressed by the spring receiving protrusion 126d of the arm 126c of the click plate 126 in the clockwise direction around the rotation center axis 60 that is the rotation center. Then, the hook 114e is disengaged from the engaging step 40a of the play plate 34 as shown in FIG. At this time, the pressing protrusion 1 at the upper end of the left edge of the play hook lever 114
14f projects into the second opening 104 of the record plate 98,
The front engaging projection 1 at the lower end of the record lever 120 engaged with the engaging step 104a in the second opening 104 as shown in FIG.
20a is pressed to release the engagement of the front engagement protrusion 120a with the engagement step 104a as shown in FIG.

The play plate 34 disengaged from the play hook lever 114 by the hook 114e is interlocked with the play plate 34 on the front surface side of the main chassis 10, and the urging force of the torsion coil spring on the magnetic head support plate (not shown) is used. This returns to the operation release position shown in FIG. The click plate 126, which has been moved downward as described above in conjunction with the play plate 34, has the spring receiving protrusion 1 of the arm 126c at the lower end.
The return of the play plate 34 to the operation release position is followed by the biasing force of the torsion coil spring 128 engaged with 26d.

The record plate 98 disengaged by the front engaging projection 120a at the lower end portion of the record lever 120 has a tension coil spring 100 hung between the lower end portion and the main chassis 10 to urge the record plate 98 as shown in FIG. Return to the operation release position shown in.

Further, when the play plate 34 returns to the operation release position, the pinch roller lever (not shown) is rotated so as to separate the pinch roller from the capstan (not shown), and the eject plate drive pin 46 of the pinch roller lever moves the left side. In the eject plate 22 that has been pressed in one direction, the stop plate 36 returns to the operation release position shown in FIG. 1, and the engaging step portion 26f at the upper end portion of the left edge of the stop plate 36 becomes the upper end portion of the eject plate 22. When moved above the hook portion 22f, the elastic force of the first spring portion 22b at the left edge portion rotates clockwise around the fixing pin 24 to return to the operation release position shown in FIG. .

From the above description, even if the stop button 28 is pressed while the play mode is set in the tape recorder,
It can be seen that the play plate 34 is returned to the operation release position and the setting of the play mode is released in the same manner as described above.

Next, while the operation release mode (that is, stop mode) is set in the tape recorder, the REW / FF slide button 14
Suppose 4 is pushed to the left. By this pressing, the slide plate 132 moves to the left against the elastic force of the elastic extension portion 138 at the left end. Slide plate 132 moved to the left
Is a downward force against the biasing force of the torsion coil spring 128 in which the click pin 136 at the right end of the rear surface is engaged with the lower end of the click plate 126 at the upper end of the elastic engagement protrusion 130 at the upper end of the click plate 126. 18 and then engages with the first engagement recess 130a as shown in FIG. 18 against the elastic force of the elastic extension 138 to the left from the operation release position shown in FIG. 18 and is held at the fast forward mode setting position shown in FIG.

The pressing distance of the click plate 126 by the click pin 136 of the slide plate 132 is much smaller than the pressing distance of the play plate 34 when the play mode is set or the record mode is set.

The engagement step portion 132g at the left end portion of the rear surface of the slide plate 132 that has moved to the left comes into contact with the second contact portion 22g of the hook portion 22f at the upper end portion of the eject lever 22 and presses it to the left. This causes the eject lever 22 to move to the first edge of the left edge.
Is rotated counterclockwise around the fixing pin 24 against the urging force of the spring portion 22b, and the hook portion 22f at the upper end is located below the engaging stepped portion 26f at the upper left end of the stop plate 26. Move from the position to the left as shown in FIG.

The switch drive protrusion 140 at the lower edge of the left end of the slide plate 132 moved to the left is a mode high speed rotation switch 142
The pair of elastic contact pieces 142a are pressed to turn on the motor high speed rotation switch 142. As a result, the electric circuit (not shown) rotates the motor 14 shown in FIG. 9 clockwise at a predetermined speed, which is much faster than the rotational speed of the output shaft pulley 20 when the play mode is set or the record mode is set. Control to rotate in the direction. As described above, the high-speed rotation of the output shaft pulley 20 causes the power transmission belt 150, the flywheel 148, and the flywheel output gear 14 shown in FIG.
It is transmitted to the take-up reel shaft gear 70 via the 8a and the idler gear 82.

Here, the play button 44 and the record button 108 are added to the magnetic recording tape in the tape cassette (not shown).
Is not pressed, the magnetic head, the erasing head, and the pinch roller (not shown) are not in contact with each other.

Therefore, the magnetic recording tape is mounted on the supply reel shaft (not shown) corresponding to the freely rotating supply reel shaft gear 94 from the supply reel hub (not shown), and the magnetic recording tape corresponds to the take-up reel shaft gear 70. It is wound at high speed onto a take-up reel hub (not shown) mounted on the shaft.

Driven protrusion 132 on the lower edge of slide plate 132 held in the fast forward mode setting position
As shown in FIG. 18, f is located below the left side of the inverted V-shaped second sliding contact surface 26c at the lower edge of the stop plate 26 that is located at the operation release position.

Therefore, when the stop button 28 is pressed while the slide plate 132 is held at the fast forward mode setting position, the slide plate 132 is moved by the left side of the second sliding contact surface 26c at the lower edge of the stop plate 26. Is driven to the right on the driven protrusion 132f, and as a result, the first engaging recess 13 of the elastic engaging protrusion 130 of the click plate 126 is
The engagement of the click pin 136 with respect to 0a is released, and then from the fast forward mode setting position shown in FIG. 18 to the operation releasing position shown in FIG. 1 by the elastic force of the elastic extension 138 at the left end. And return.

The slide plate 132 is returned to the operation release position by the second contact portion 2 of the hook portion 22f at the upper end portion of the eject lever 22 by the engagement step portion 132g at the left end portion of the slide plate 132.
Since the pressure on 2g is released, the eject lever 22
Is the fixing pin 2 due to the biasing force of the first spring portion 22b at the left edge.
4 is rotated clockwise to move the hook portion 22f at the upper end from the lower position of the engaging step portion 26f at the upper end of the left edge of the stop plate 26 to the left as shown in FIG. From the open position to the lower position as shown in FIG.

Now, while the tape recorder is set to the play mode or record mode described above, the REW / FF slide button
If 144 is pressed to the left, the distance by which the play plate 34 pushes down the click plate 126 when the play mode is set or the record mode is set depends on the click pin 136 of the slide plate 132 when the fast forward mode is set. Click plate 12
Since it is much larger than the pushing distance of 6, the slide plate 132 moved to the left is moved to the first engaging recess 130a of the elastic engaging projection 130 at the upper end of the click pin 136 of the click plate 136. It cannot be engaged. Such a slide plate 132 can be held in the fast forward (forward) mode setting position as shown in FIG. 18 only while applying a leftward force to the REW / FF slide button 144.

In this embodiment, when the REW / FF slide button 144 is pressed to the left while the above-mentioned play mode or record mode is set in the tape recorder, the above-mentioned electric circuit (not shown) contacts the magnetic recording tape. The cue signal is recorded on the magnetic recording tape by the aforementioned magnetic head (not shown).

Next, while the operation release mode (that is, stop mode) is set in the tape recorder, the REW / FF slide button 14
Suppose 4 is pushed to the right. By this pressing, the slide plate 132 moves to the right against the elastic force of the elastic extension portion 138 at the left end. Slide plate 132 moved to the right
Is the biasing force of the torsion coil spring 128 in which the click pin 136 at the right end of the rear surface is engaged with the lower end of the click plate 126 where the second engaging recess 126e of the click plate 126 is formed. 19 and then engages with the second engaging recess 126e as shown in FIG. 19 to slightly push it downwardly against the elastic force of the elastic extension portion 138, and the operation shown in FIG. It is held at the rewind (fast rewind) mode setting position shown in FIG. 19 which has moved to the right from the release position.

The pressing distance of the click plate 126 by the click pin 136 of the slide plate 132 is much smaller than the pressing distance of the play plate 34 when the play mode is set or the record mode is set.

REW / is connected to the rotation connecting portion 122a at the upper end in the connecting recess 132e at the lower edge of the slide plate 132 moved to the right.
The FF lever 122 rotates clockwise around the center hole of the cylindrical fixing pin 30 which is the center of rotation shown in FIG. 9 by moving the slide plate 132 to the right, and the right edge The engaging projection 122c presses the contact surface 80b of the idler lever 80 to rotate the idler lever 80 around the capstan bearing 66 in the counterclockwise direction against the biasing force of the tension coil spring 88. This rotation causes the idler gear 82 on the idler lever 80 to mesh with the idler gear 92 on the supply reel shaft support lever 90 located on the right side thereof. Idler lever
The above-described rotation of the idler lever 80 is restricted by the right edge of the lower end portion of the idler lever 80 contacting the engaging pin 96 located below the supply reel shaft support lever 90 from the left side. Excessive biting of the idler gear 82 on the idler lever 80 with respect to the upper idler gear 92 is prevented.

REW / F accompanying movement of slide plate 132 to the right
The above-described rotation of the F lever 122 causes upward pressing of the first contact portion 23b at the lower end portion of the eject lever 22 by the pressing surface at the left edge of the lower end portion of the REW / FF lever 122. As a result, the eject lever 22 is rotated counterclockwise around the fixing pin 24 against the biasing force of the first spring portion 22b at the left edge portion, and the hook portion 22f at the upper end portion of the stop plate 26 is rotated. From the lower position of the engagement step 26f at the upper end of the left edge,
Move it to the left as shown in Fig. 9.

The elastic extension portion 138 at the left end of the slide plate 132 that has moved to the right presses the pair of elastic contact pieces 142a of the motor high speed rotation switch 142 to turn on the motor high speed rotation switch 124. As a result, the electric circuit (not shown) rotates the motor 14 shown in FIG. 9 clockwise at a predetermined speed, which is much faster than the rotational speed of the output shaft pulley 20 when the play mode is set or the record mode is set. Control to rotate in the direction. As described above, the high speed rotation of the output shaft pulley 20 is caused by the idler on the supply reel shaft support lever 90 via the power transmission belt 150, the flywheel 148, the flywheel output gear 148a and the idler gear 82 shown in FIG. The idler gear 92 is transmitted to the gear 92, and the idler gear 92 transmits the high speed rotation to the supply reel shaft gear 94.

Here, the play button 44 and the record button 108 are added to the magnetic recording tape in the tape cassette (not shown).
Is not pressed, the magnetic head, the erasing head, and the pinch roller (not shown) are not in contact with each other.

Therefore, it corresponds to the supply reel shaft gear 94 to which the high-speed rotation is transmitted from the winding reel hub (not shown) mounted on the winding reel shaft (not shown) corresponding to the freely rotating winding reel shaft gear 70. It is wound at a high speed onto a supply reel hub (not shown) mounted on a supply reel shaft (not shown).

The record lever drive projection 132c at the right end of the slide plate 132 held at the rewind (fast rewind) motor setting position contacts the front engaging projection 120a at the lower end of the record lever 120 as shown in FIG. Engaging protrusion 120a
The engaging step 104 in the second opening 104 of the record plate 98.
It is moved to the right of a.

Driven protrusion 132f on the lower edge of the slide plate 132 held at the rewind (fast rewind) motor setting position
As shown in FIG. 19, the second sliding contact surface of the inverted V-shape of the lower edge of the stop plate 26 arranged at the operation releasing position is shown in FIG.
It is located below the right side of 26c.

Therefore, while the slide plate 132 is held at the rewind (fast rewind) motor setting position, the stop button 2
When 8 is pressed, the slide plate 132 is driven to the left by the driven protrusion 132f by the right side of the second sliding contact surface 26c at the lower edge of the stop plate 26, and as a result, the upper end of the click plate 126 is The engagement of the click pin 136 with the second engagement recess 126e is released, and then the elastic force of the elastic extension portion 138 at the left end from the rewind (fast rewind) motor setting position shown in FIG. It returns to the operation release position shown in FIG.

REW to return the slide plate 132 to the operation release position
Since the pressing surface of the left edge of the lower end of the / FF lever 122 cancels the upward pressing of the first contact portion 23b of the lower end of the eject lever 22, the eject lever 22 moves to the first edge of the left edge.
By the urging force of the spring portion 22b of the above, the fixing pin 24 is rotated clockwise, and as shown in FIG.
22f is the engagement step 26f at the upper end of the left edge of the stop plate 26.
From the lower position to the left, the position is returned to the lower position as shown in FIG.

Now, while the above-mentioned play motor and record mode are set in the tape recorder, the REW / FF slide button
If 144 is pressed to the right, the distance by which the click plate 126 is pushed down by the play plate 34 when the play mode is set or the record mode is set is the slide plate 13 when the rewind mode is set as described above.
Since the distance by which the click plate 136 is pushed down by the second click pin 136 is much larger, the slide plate 132 moved to the right is located in the second engagement recess 126e at the upper end of the click pin 136. It cannot be engaged with each other. Such slide plate 132
Can be held at the rewind (fast rewind) mode setting position as shown in FIG. 19 only while applying a rightward force to the REW / FF slide button 144.

This means that while the REW / FF slide button 144 is held in the fast forward mode setting position or the rewind mode setting position described above, the play mode or record mode setting is performed. When the plate 34 is moved downward from the operation release position shown in FIG. 1, the slide plate 1 by the click plate 126 is moved to the fast forward mode setting position or the rewind mode setting position described above.
It also means that 32 holds will be released.

When the REW / FF slide button 144 is pressed to the right while the tape recorder is set to the play mode or the record mode described above, the record lever drive projection 132d at the right end of the slide plate 132 is the record lever as described above. Since the front engagement protrusion 120a at the lower end of the record lever 120 is pressed to the left, the front engagement protrusion 120a at the lower end of the record lever 120 is left from the engagement step 104a of the second opening 104 of the record plate 98. The record plate 98, which is separated from the record mode setting position at the record mode setting position, returns to the operation releasing position as shown in FIG. 1 by the urging force of the tension coil spring 100. That is, the record mode is released. However, since the play plate 34 does not return to the operation release position, the reproduction mode is set in addition to the rewind (fast rewind) mode, which is the so-called quick review mode.

Next, the automatic stop mode in the tape recorder will be described.

While the above-mentioned play mode or record mode is set in the tape recorder, the upward engaging surface 40b and the trigger lever 40 of the engaging projection 40 at the lower end portion of the play plate 34 arranged at the play mode setting position. A gap is created between the laterally extending end of the laterally extending end and the rotation restricting protrusion 124c on the rear surface, and the trigger lever 124 can be rotated in the clockwise direction with the guide pin 54 as the center of rotation. Already mentioned above.

And on the front side of the main chassis 10, the supply reel shaft gear
When the magnetic recording tape reaches the end on the supply reel hub mounted on the supply reel shaft (not shown) corresponding to 94, the tensile force applied to the end of the magnetic recording tape sharply increases, The supply reel shaft support lever supporting the supply reel shaft gear 94 by this increased pulling force
90 rotates counterclockwise around a rotation center axis (not shown) of the idler gear 92. By the above rotation, the second engaging projection 90d at the lower end portion of the supply reel shaft supporting lever 90 is separated rightward from the engaging pin 96 on the back surface of the main chassis 10, and instead, the second engaging protrusion 90d of the supply reel shaft supporting lever 90 is moved. The first engaging projection 90b at the upper end portion of the left edge contacts the upper end portion of the right edge of the idler lever 80 to restrict the turning distance in the counterclockwise direction.

As described above, the supply reel shaft support lever 90 rotated in the counterclockwise direction by the regulated distance has the engaging surface 90e on the right edge.
As a result, the contact protrusion 124d at the left edge of the trigger lever 124 is pressed to the right to cause the trigger lever 124 to rotate in the clockwise direction with the guide pin 54 as the center of rotation. Due to this rotation, the rightward disengagement portion 12 extending in the up-down direction is formed at the right end of the upper protruding portion 124b at the upper end portion of the trigger lever 124.
As shown in FIG. 20, 4f comes into contact with the left edge of the hook 114e of the play hook lever 114 engaged with the engagement step portion 40a of the engagement protrusion 40 of the play plate 34 at the play mode setting position.

The above-mentioned rotation of the trigger lever 124 also causes the abutting portion 124a on the front surface of the leftward extending end of the trigger lever 124 to move as shown in FIG.
Trigger lever drive pin 148 on the back of the flywheel 148
Move it to the movement path of a. Here, the acute-angled end of the trigger lever drive pin 148a on the flywheel 148 faces the acute-angled end of the abutment portion 124a on the trigger lever 124 in the circumferential direction of the flywheel 148, and the outer side in the radial direction on the trigger lever drive pin 148a. The radially outer edge A curved inwardly also faces the radially inner edge B radially outwardly curved on the abutment portion 124a in the circumferential direction.

When the flywheel 148 further rotates in the clockwise direction by the rotation of the supply reel shaft support lever 90 at the regulated distance in the counterclockwise direction, the disengagement portion 124f at the right end of the upward projecting portion 124b is moved to the 20th position. As shown in the figure, the trigger lever 124 that is brought into contact with the left edge of the hook 114e of the play hook lever 114 that is engaged with the engagement step portion 40a of the engagement protrusion 40 of the play plate 34 in the play mode setting position is Flywheel 14 that abuts the inner radius B of the abutting portion 124a on the trigger lever 124.
The inertial force of the flywheel 148 applied to the abutting portion 124a by the outer radial edge A of the trigger lever drive pin 148a on the 8 causes the hook of the play hook lever 114 to engage with the engaging step 40a of the engaging protrusion 40 of the play plate 34. Since the engaging frictional force of 114e is overcome, the abutting portion 124a is moved outward in the radial direction, and as a result, the trigger lever 124 is rotated in the clockwise direction around the guide pin 54, which is the rotation center, and the play plate is moved.
The engagement of the hook 114e of the play hook lever 114 with the engagement step portion 40a of the engagement protrusion 40 of 34 is released.

As a result, the play plate 34 is moved to the operation release position shown in FIG. 1 as in the stop mode setting shown in FIG. Return by the urging force of.

The pressing protrusion 114f at the upper end of the right edge of the play hook lever 114 moved to the disengagement position by the trigger lever 124 rushes into the second opening 104 of the record plate 98 and is forward of the lower end of the record lever 120. Since the engaging projection 120a is pushed to the right of the engaging step 104a in the second opening 104, even when the record mode is set, it is the same as when the stop mode is set as shown in FIG. The record lever 120 is returned to the operation release position shown in FIG. 1 by the urging force of the tension coil spring 100 at the lower end.

By the way, finally, as shown in FIG. 1, when the stop button 28 is pressed while the play button 44 and the record button 108 of the tape recorder are arranged in the operation release position, the upper end of the left edge of the stop plate 26 is pressed. The engaging stepped portion 26f contacts the right end portion of the upper edge of the hook portion 22f at the upper end portion of the eject plate 22 and presses the eject plate 22 downward. As shown in FIG. 22, the eject plate 22 pressed downward moves downward against the elastic force of the second spring portion 22c that is in contact with the shaft support 72, and the surface side of the main chassis 10 moves. Drives an eject mechanism (not shown) that is interlocked with the eject plate 22. An eject mechanism (not shown) driven by the eject plate 22 detaches the above-mentioned tape cassette (not shown) mounted at a predetermined position on the front surface side of the main chassis 10 from the predetermined position.

(Effect) The automatic stop device for a tape recorder according to the present invention has a tape supply shaft that is rotatably supported by a fixed substrate of the tape recorder and that engages with a tape sending side hub around which a magnetic recording tape is wound. And a tape end detection lever which is rotated by a tensile force applied to the magnetic recording tape when the magnetic recording tape sent from the tape sending side hub reaches the end.
A play hook member that engages with the play mode setting member arranged at the play mode setting position and holds the play mode setting member at the play mode setting position; a drive unit fixed to the flywheel; Supported by the tape end detection lever, the rotation of the tape end detection lever is started, and after the start of rotation, the drive portion of the flywheel comes into contact with the abutment portion, and after the start of rotation, the abutment portion abuts against the drive portion of the flywheel. And a trigger member having a disengagement portion that disengages the play hook member from the play mode setting member by driving the play hook member when the joint portion is driven by the drive portion; Each of the drive portion of the wheel and the abutting portion of the trigger member has a substantially wedge-shaped end portion that opposes each other in the rotation direction of the flywheel. With the start of the rotation of the material, the abutment part of the trigger member moves from one peripheral side of the drive part of the flywheel to the other peripheral side, and the drive part of the flywheel is The other peripheral edge of the end portion abuts on the peripheral edge of the end portion of the abutting portion of the trigger member, and after the contact, the drive portion of the flywheel causes the other peripheral edge of the end portion to move with further rotation of the flywheel. When the trigger member is further rotated by gradually moving the peripheral edge of the end of the abutting portion of the trigger member in the radial direction of the flywheel, the disengagement portion of the trigger member moves the play hook member relative to the play mode setting member. Since it is characterized by releasing the engagement, even if the initial rotation amount of the trigger member is small and the inertia force of the flywheel is small, Can be reliably carried out the disengagement operation of the play hook member with respect to the de-setting member, it is possible to reliably performed the automatic stop of the turn tape recorder.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing various members arranged on the rear surface side of a main chassis of a tape recorder provided with an automatic stop device according to an embodiment of the present invention; FIG. FIG. 3 is a schematic plan view showing only the record plate shown in the drawing; FIG. 3 is a schematic plan view showing only the record lever shown in FIG. 1; and FIG. 4 is a play shown in FIG. FIG. 5 is a schematic plan view showing only the hook lever, FIG. 5 is a schematic plan view showing only the REW / FF lever shown in FIG. 1, and FIG. 6 is a trigger lever shown in FIG. FIG. 7 is a schematic plan view showing only the click plate shown in FIG. 1; FIG. 8 is a schematic plan view showing only the slide plate shown in FIG. 1; FIG. 9 is a schematic plan view showing FIG. Fig. 10 is a schematic plan view showing some of the members placed closest to the back surface of the main chassis; Fig. 10 is a view along the right edge of the back surface of the main chassis in Fig. 1. FIG. 11 is a partial plan view schematically showing the state where the record plate of FIG. 2 is arranged; FIG. 11 shows some of the members shown in FIGS. 9 and 10, and FIG. FIG. 12 is a schematic plan view showing a state in which the record lever, the play hook lever shown in FIG. 4 and the REW / FF lever shown in FIG. FIG. 13 is a schematic plan view showing a state in which the trigger levers of FIG. 6 are arranged in an overlapping manner on the members; FIG. 13 is a click plate of FIG. 7 on some members shown in FIG. And the slide plates shown in FIG. 8 are finally placed in the above-mentioned various members so as to obtain the state shown in FIG. FIG. 14 is a schematic plan view showing a state immediately before the operation; FIG. 14 mainly shows movements of the click plate shown in FIG. 7 among the above various members when the play mode is set in the tape recorder shown in FIG. FIG. 15 is a schematic partial plan view showing the movements of the various members when the play mode is set in the tape recorder shown in FIG. 1 of the click plate shown in FIG. FIG. 16 is a schematic plan view showing movements of the record plate shown in FIG. 2 among various members when the record mode is set in the tape recorder shown in FIG. FIG. 17 is a schematic partial plan view; FIG. 17 shows the state immediately before the stop mode setting button is pressed and the record mode is released in the tape recorder of FIG. 1 and the click plate of FIG. 7 and the slide play of FIG. FIG. 18 is a schematic plan view showing the tape recorder of FIG. 1 when the fast forward mode is set by moving the slide plate of FIG. 8 leftward. FIG. 19 is a schematic plan view showing the states of various members; FIG. 19 shows the above-mentioned various conditions when the rewind mode is set by moving the slide plate of FIG. 8 to the right in the tape recorder of FIG. 20 is a schematic plan view showing the state of the members of FIG. 20. FIG. 20 is an automatic shutoff (automatic stop) due to an increase in the tensile force applied to the end of the magnetic recording tape in the tape recorder of FIG. 1 in the play mode setting. FIG. 21 is a schematic plan view showing the states of the above various members when the mechanism starts to operate, excluding the slide plate of FIG. 8; In the tape recorder of FIG. 1, the states of the above various members immediately before the play mode is released due to the termination of the operation of the auto shut-off mechanism due to the increase in the tensile force applied to the end of the magnetic recording tape. FIG. 22 is a schematic plan view showing a state in which the slide plate is excluded; FIG. 22 shows states of the above various members when the eject mode is set in the tape recorder shown in FIG.
It is a schematic plan view which excludes and shows the slide plate of a figure. 10 …… Main chassis (fixed board), 34 …… Play plate (Play mode setting member), 90 …… Supply reel shaft support lever (Tape end detection lever), 114 …… Play hook lever (Play hook member), 124 ...... Trigger lever (trigger member), 124a …… Abutting part, 124f …… Disengagement part, 148 …… Flywheel, 148a …… Trigger lever drive pin (drive part).

Claims (1)

(57) [Scope of utility model registration request] 1. A tape recorder having a tape supply shaft which is rotatably supported by a fixed substrate of a tape recorder and which engages with a tape delivery side hub around which a magnetic recording tape is wound, and which is delivered from the tape delivery side hub. And a tape end detection lever which is rotated by a tensile force applied to the magnetic recording tape when the end of the magnetic recording tape is reached; and a play mode setting member engaged with a play mode setting member arranged at a play mode setting position. A play hook member held at a play mode setting position; a drive unit fixed to a flywheel; rotatably supported by the fixed substrate, and starts rotation by the rotation of the tape end detection lever and rotates. After the start, the abutting part with which the drive part of the flywheel comes into contact and the abutting part that comes into contact with the drive part of the flywheel after the start of rotation are driven by the drive part to play A trigger member having a disengagement portion for driving the member to disengage the play hook member from the play mode setting member; and a flywheel drive portion and an abutting portion of the trigger member, respectively. Have substantially wedge-shaped end portions that face each other in the rotation direction of the flywheel, and the abutment portion of the trigger member is rotated around one side of the drive portion of the flywheel as the trigger member starts rotating. Moving from the edge side to the other peripheral edge side, after the movement of the abutting portion of the trigger member, the drive portion of the flywheel has the other peripheral edge of the end portion contact the peripheral edge of the end portion of the abutting portion of the trigger member, After the contact, the driving portion of the flywheel gradually reduces the peripheral edge of the end portion of the abutting portion of the trigger member in the radial direction of the flywheel by the other peripheral edge of the end portion as the flywheel rotates further. An automatic stopping device for a tape recorder, wherein the engagement releasing portion of the trigger member disengages the play hook member from the play mode setting member by moving the trigger member further and further rotating the trigger member.