JPH0248991Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is applicable to tape recorders and VTRs, for example.
It relates to a traveling reversing mechanism in an auto-reverse machine, in particular a reversing system that uses a rotating body having a cam and a partially toothed gear, and switches the traveling drive system and a pair of pinch rollers using the cam due to the rotational drive of the rotating body. The present invention relates to a travel reversal mechanism in an auto-reverse machine configured to drive an operating member.

BACKGROUND TECHNOLOGY AND PROBLEMS There is a conventional mechanism of this type as shown in FIG. Next, FIG. 1 will be explained.

The rotating body 2 has a toothless gear 2A consisting of a gear portion and a toothless portion formed by a pair of notches 1a and 1b connected to the gear portion and facing each other at 180 degrees. It is rotatable around the center, and an external biasing force is always applied to rotate it in the direction of arrow X in FIG.

On the other hand, the rotation stop lever 5, which rotates around the fulcrum shaft 4, is rotated in the direction of arrow Y in FIG. 1 by the action of the plunger 6 against the elastic force of the tension spring 7. Then, the protruding piece 5a is removed from the engaged pin 8a of a pair of pins 8a and 8b that are similarly fixed to the rotating body 2 so as to face each other at 180 degrees. .

Therefore, the rotary body 2 is urged to rotate in the direction of the arrow X in FIG. 1 by the external biasing force, and the rotor 2 is rotated in the direction of arrow Since the gear 9A of the driving rotary body 9 rotating in the direction of arrow Z in FIG. 1 is meshed with the gear part of the partially toothed gear 2A, it is rotated in the direction of arrow X in FIG. As a result, the reversing operation lever 10, which is a reversing operation member that switches between the traveling drive system and the pair of pinch rollers, is operated by the eccentric plate cam portion 2B formed on the rotary body 2, and the pair of engagement piece portions 1
It is driven in the direction of arrow _A0 in FIG. 1 via 0A and 10B.

Then, when the rotating body 2 rotates half a rotation, the gear 9A of the driving rotating body 9 is again positioned opposite to the toothless portion formed by the other notch 1b, and the other pin fixed to the rotating body 2 8b is engaged with the protruding piece 5a of the rotation stop lever 5 which has been rotated in the direction of arrow Y' in FIG. Ru. In this way, the reversing operation lever 10 is held in a driven state in the direction of the arrow _A0 in FIG.

In this way, the reversing operation lever 10 is alternately driven in the direction of the arrow _A0 and the direction of the arrow _A0 ' in FIG. 1 every half rotation of the rotating body 2, and a predetermined reversing switching operation is performed.

However, this method requires a rotation stop lever 5, etc., and further requires the use of a plunger 6, etc. that provides a rotation trigger, resulting in a complicated structure and high cost.

Purpose of the invention The present invention was devised in view of the above-mentioned circumstances, and its purpose is to eliminate the need for auxiliary devices such as plungers that provide rotation triggers, which were conventionally required. It is an object of the present invention to provide a travel reversing mechanism for an auto-reverse machine that can simplify the structure, reduce costs, and further ensure the reliability of reversing operation.

Summary of the invention The travel reversal mechanism in the auto-reversing machine according to the invention includes: (a) a first rotating body that is driven to rotate in forward and reverse directions by a motor; (b) rotationally driven by the first rotating body; (c) a second rotary body that is oscillated in accordance with the rotational direction of the first rotary body and has a gear; (c) a gear part that meshes with the gear of the second rotary body; and a gear part that is connected to the gear part. a third rotating body having a toothless gear consisting of a toothless portion, and a cam that drives a reversing operation member that switches between a traveling drive system and a pair of pinch rollers, and the gear of the second rotating body is The second rotary body is oscillated by forward and reverse rotational driving of the first rotary body at a position facing the toothless portion of the toothless gear of the third rotary body, and the gear of the second rotary body is oscillated. The gear portion of the partially toothed gear of the third rotary body is engaged with the gear portion of the partially toothed gear of the third rotary body to select forward and reverse rotation of the third rotary body, and the third rotary body is selectively driven to rotate in the forward and reverse directions. The present invention is characterized in that the reversing operation member is driven by a cam of the third rotating body to switch the travel drive system and the pair of pinch rollers.

As a result, the third
The rotating body is selectively driven to rotate in forward and reverse directions, and a reversing operation member that switches between the travel drive system and the pair of pinch rollers is driven.

Therefore, a device for applying a rotation trigger to the third rotating body having a partially toothed gear is not required, and the structure can be simplified and costs can be reduced.

Embodiment Next, an embodiment in which the travel reversing mechanism in an auto-reverse machine according to the present invention is applied to a car stereo will be described with reference to the drawings.

FIG. 2 is a sectional view, and FIGS. 3A to 3D are plan views.

A motor shaft 22 of a motor M for driving a capstan mounted on a mechanical board 21 protrudes below the mechanical board 21.
A two-stage pulley 23 is fixed to the lower end of. Note that the lower pulley 23a of the two-stage pulley 23 and a pair of first and second capstans 24, 2, which will be described later,
A belt 26 is wound between the first and second capstan flywheels 24F and 25F corresponding to the motor M.
and second capstans 24 and 25. A first rotating body 29 is disposed on the outer periphery of the lower half of the intermediate shaft 28 whose upper and lower ends are fixed to the mechanical board 21 and a part of the sub-board 27.
is rotatably mounted. A gear 29A and a pulley 29B are provided at both upper and lower ends of the first rotating body 29.
A belt 30 is wound between the pulley 29B and the upper pulley 23b of the two-stage pulley 23. Also, intermediate shaft 2
A swinging body 31 is attached to the outer periphery of the upper half of the swinging body 8 so as to be swingable in a horizontal plane about its intermediate shaft 28. A swing shaft 32 is vertically fixed to the lower part of one end of the swing body 31, and a second rotating body 33 is rotatably attached to the outer periphery of the swing shaft 32. It is mounted so that it can move freely in the axial direction. Note that above and below the second rotating body 33,
Gears 33A and 33B of different sizes and diameters are integrally provided, and the upper gear 33A is always meshed with the gear 29A. Furthermore, a friction plate 34 made of felt or the like is interposed between the lower surface of the oscillating body 31 and the upper surface of the second rotating body 33 at the outer peripheral position of the oscillating shaft 32. The second rotating body 33 is connected to the swing shaft 3
The upper part of the washer 35 is fitted slightly above the lower end 32a of the swing shaft 32, and is pressed upward by a compression spring 36 fitted to the outer periphery of the swing shaft 32. Therefore, the second rotating body 33
It is configured to be rotated in a state in which it is in frictional contact with the rocking body 31 via the rocker 4. In addition, the rocking body 3
A balance weight 37 is fixed to the lower part of the end opposite to the swing shaft 32, sandwiching the middle shaft 28 of the shaft 1. Further, the lower end 32a of the swing shaft 32 is inserted into a swing regulation hole 38 provided in the mechanical board 21, and the swing shaft 32 is connected to the third A at both ends 38a, 38b of the swing regulation hole 38. As shown in FIGS. 3D to 3D, the swing range is restricted.

On the other hand, a cam-equipped rotating body 40, which is a third rotating body, is attached to the mechanical board 21 so as to be rotatable about a fulcrum shaft 39 fixed vertically. A disc-shaped eccentric plate cam portion 40A is formed on the upper surface of this cam-equipped rotating body 40, and the outer peripheral gear is a toothless portion formed by a gear portion and a partial notch 41 on its circumferential surface. The partially toothed gear 40B is composed of the following. The gear portion of the partially toothed gear 40B is configured to mesh with the lower gear 33B of the second rotating body 33 so that forward and reverse rotation can be selected. Furthermore, a pin 43 is integrally provided on the lower surface and abuts on a bent portion 42 formed by bending a portion of the mechanical board 21 upward.

Therefore, the reversing operation lever 44, which is a reversing operation member for switching the travel drive system and the pair of pinch rollers 45 and 46, which will be described later, has a reversing operation lever 44 that projects parallel to one side within a horizontal plane at one longitudinal end 44a thereof. A pair of engaging pieces 44A and 44B are integrally provided. A pair of engagement pieces 44
A, 44B sandwich the disc-shaped eccentric plate cam portion 40A and face each other in the radial direction, and one side surface of the one end portion 44a including the pair of engagement pieces 44A, 44B is a rotating body with a cam. It is disposed so as to be in sliding contact with the upper surface of 40. Note that the pair of engagement pieces 44
A, 44B is the engagement piece portion 4 attached to the eccentric plate cam portion 40A.
The spacing is such that 4A and 44B are in contact with each other.

Further, the reversing operation lever 44 is configured to apply a biasing force in the direction of arrow A' shown in FIGS. 3A and 3B by a tension spring (not shown) or the like in the position shown in FIGS. In the position shown in the 3D diagram, it is configured to apply a biasing force in the direction of arrow A shown in the diagram.

Next, the operation will be explained.

First, in FIG. 3A, the capstan driving motor M is driven to rotate in the forward direction, and the reversing operation lever 44 is driven in the direction of arrow A in FIG.
6 shows the normal running state when the vehicle is switched to the normal running state. At this time, the cam-equipped rotating body 40 is locked at the normal running position.

That is, in the normal running state, as shown in FIG. 3A, the motor M is driven to rotate in the forward direction, the belt 30 is running in the direction of arrow a, and the gear 33B of the second rotating body 33 is in the notch 41. It is located opposite to the toothless portion thus formed.
Further, the swing shaft 32 is connected to one end 38 of the swing regulation hole 38.
It is in contact with the a side. However, at this time, the third
The biasing force F ₁ by the reversing operation lever 44 applied in the direction of arrow A' in Fig. A is applied to a position that is offset upward by a distance L ₁ in Fig. 3A with respect to the center of the rotating body 40 with a cam, and as a result, The rotational moment due to F ₁ ×L ₁ acts on the rotating body 40 with a cam, so that
The cam-equipped rotating body 40 is urged to rotate in the direction of arrow b in FIG. 3A. The rotating body 40 with a cam is
The pin 43 is brought into contact with the bent portion 42 of the mechanical board 21 from the direction of the arrow b in FIG. 3A, and is locked at the position shown in FIG. 3A, that is, the normal running position.

Next, by switching to reverse running, the motor M is driven to rotate in the reverse direction, and the belt 30 is rotated by the arrow shown in FIG. 3B.
When traveling in the a′ direction, the first rotating body 29 moves to the third B
It is rotated in the direction of arrow d in the figure. And the first
The gear 29A of the rotating body 29 connects the upper gear 33A.
The second rotating body 33 is rotationally driven in the direction of arrow e in FIG. 3B. At this time, the friction plate 3 interposed between the second rotating body 33 and the rocking body 31
4, a rotational moment is applied to the rocking body 31 in the direction of arrow f in FIG. 3B about the intermediate shaft 28, and the rocking body 31 is rocked in the same direction.

Then, as shown in the figure, the lower gear 33B of the second rotary body 33 becomes the partially toothed gear 40B of the cam-equipped rotary body 40.
The lower gear 33B rotates the cam-equipped rotating body 40 in the direction of arrow b' in FIG. 3B via the partially toothed gear 40B. Note that at this time, the lower end 32a of the swing shaft 32 is in contact with the other end 38b of the swing restriction hole 38, as shown, and the range of swing of the swing body 31 in the direction of the arrow f is restricted. .

Then, the rotating body 40 with cam is indicated by the arrow in FIG. 3B.
By being rotationally driven in the b' direction, the reversing operation lever 44 is forcibly driven in the arrow A' direction in FIG. 3B by the eccentric plate cam part 40A via the engagement pieces 44A and 44B. As will be described later, the travel drive system and the pair of pinch rollers 45, 46 are switched to the reverse travel state. In addition, the rotating body 40 with a cam is rotated 360 degrees in the direction of arrow b' in Fig. 3B.
When the rotating body 40 with a cam has been rotated by an angle corresponding to a width of 1, the rotating body 40 with a cam reaches the reverse running position as shown in FIG.
The second rotating body 3 is formed by the toothless portion formed by
3, and is automatically stopped at that position.

When the cam-equipped rotating body 40 reaches the reverse traveling position as shown in FIG. 3C, it will be locked again at that position.

That is, the biasing force F ₂ applied in the direction of arrow A in FIG. 3C by the reversing operation lever 44 is a distance upward in FIG.
L ₂ acts on the biased position, resulting in F ₂ ×L ₂
As the rotational moment of
It is urged to rotate in the b' direction. Then, the cam-equipped rotating body 40 brings the pin 43 into contact with the bent portion 42 of the mechanical board 21 from the arrow b' direction as shown in FIG. 3C, and
It is locked in the position shown in FIG. 3C, that is, in the reverse travel position.

Next, for normal switching, the motor M is driven to rotate in the forward direction, and the belt 30 is run in the direction of arrow a in FIG. 3D. Then, the lower gear 3 of the second rotating body 33 is rotated due to the reverse operation at the time of switching to reverse travel as described above.
3B is rotated in the direction of arrow e' in FIG.
is meshed again with the gear portion of the partially toothed gear 40B, and the rotating body 40 with a cam is rotationally driven in the direction of the arrow b in FIG. 3D. As a result, the reversing operation lever 44 is forcibly driven in the direction of arrow A in FIG. 3D.

Note that it is also possible to change the configuration so that the first rotating body 29 and the second rotating body 33 are interlocked by a belt, and the second rotating body 33 is swung according to the rotational direction of the first rotating body 29. .

Next, the traveling drive system and switching of the pair of pinch rollers 45 and 46 by the reversing operation lever 44 will be explained with reference to FIG.

First, the motor M constitutes a capstan driving motor as described above. A two-stage pulley 2 fixed to the motor shaft 22 of this motor M
The belt 26 wrapped around the lower pulley 23a of No. 3 is
A pair of first and second capstans are fixed in correspondence with the first and second capstans 24 and 25, respectively.
It is wound around flywheels 24F and 25F as shown in the figure. The motor M rotates the first and second capstans 24 and 25 in the same direction.

Next, the first and second flywheels 24
F, 25F are integrally provided with inner gears 24A, 25A and outer gears 24B, 25B, respectively, and a pair of first and second reel shafts 4.
On the outer periphery of 7, 48 are the husband reel stand gears 47A, 4.
8A is integrally provided.

During normal running, the motor M is driven to rotate in the forward direction, and the reversing operation lever 44 is driven in the direction of arrow A in FIG. 3A as described above. Then, by driving the reversing operation lever 44, the normal idler 49 is moved in the direction of arrow B in FIG. The reverse idler 50 is rotated in the direction of arrow C so as to be separated from the reel base gear 48A of the second reel shaft 48, and the pinch roller 45 on the normal side is pressed against the first capstan 24. As shown in FIG. 4, the pinch roller 46 on the reverse side is moved in the direction of the arrow D, and the pinch roller 46 on the reverse side is moved in the direction of the arrow E in FIG. . Then, as the belt 26 is driven in the direction of the arrow g in FIG. In Fig. 4, the motor is rotated in the direction of arrow h and normal running is performed.

Further, during reverse running, the motor M is driven to rotate in the reverse direction, and the reversing operation lever 44 is driven in the direction of the arrow A' in FIG. 3C as described above. and,
Similarly, the normal idler 49 is rotated in the direction of arrow B' in FIG. 25A and the reel base gear 48A of the second reel shaft 48 are rotated in the direction of arrow C', and the normal side pinch roller 45 is
The pinch roller 46 on the reverse side is moved in the direction of arrow E' in FIG. It has been switched. Then, as the belt 26 is driven in the direction of arrow g' in FIG. 4 by the reverse rotation drive of the motor M, the second reel shaft 48 is rotated using the rotational torque of the second flywheel 25F. In FIG. 4, the vehicle is rotated in the direction of arrow i to perform reverse travel.

In addition, adjustment of the running speed for normal and reverse playback and fast forwarding or rewinding is done using motor M.
In this embodiment, this is done by changing the rotational speed of.

Effects of the invention The invention has the following advantages.

Even without using a device etc. that gives a rotation trigger to the third rotating body, the third rotating body can be selectively driven in forward and reverse rotation by simply driving the motor to rotate forward and reverse, and a predetermined reversal switching operation can be performed. .

Therefore, the structure can be simplified and costs can be reduced.

In addition, due to the forward and reverse rotation drive of the motor, the gear of the second rotating body is always reliably engaged with the gear portion of the toothless gear of the third rotating body, and the third rotating body is reliably driven. Always done reliably.

[Brief explanation of the drawing]

FIG. 1 is a plan view illustrating a conventional mechanism.
2 to 4 are drawings for explaining the running reversal in the auto-reversing machine according to the present invention, in which FIG. 2 is a sectional view, and FIGS. 3A to 3D are diagrams showing the driving operation of the reversing operation lever. FIG. 4 is a plan view illustrating the locking operation of the rotating body with a cam, and FIG. 4 is a plan view illustrating the switching of the travel drive system and the pair of pinch rollers. In addition, in the symbols used in the drawings, 29
...First rotating body, 33... Second rotating body, 33B...
...Lower gear, 40... Rotating body with cam (third rotating body), 40A... Plate cam part, 40B... Gear with missing teeth,
41... Notch, 44... Reversing operation lever, 44
A, 44B...44 engagement pieces.

Claims (1)

[Claims for Utility Model Registration] (a) A first rotating body that is driven to rotate in forward and reverse directions by a motor; (b) A first rotating body that is rotationally driven by this first rotating body and the direction of rotation of this first rotating body. (c) a gear portion with which the gear of the second rotor meshes, and a toothless portion formed in series with the gear portion; a third rotary body having a gear and a cam that drives a reversing operation member that switches between a traveling drive system and a pair of pinch rollers, and the gear of the second rotary body is a partially toothed gear of the third rotary body. The second rotating body is oscillated by forward and reverse rotational driving of the first rotating body at a position facing the toothless portion of By meshing the gear portion of the partially toothed gear to select forward or reverse rotation of the third rotating body, and selectively driving the third rotating body to rotate forward or backward, the cam of the third rotating body A traveling reversing mechanism in an auto-reverse machine configured to drive the reversing operation member to switch between a traveling drive system and a pair of pinch rollers.