JPH0425624B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a loading eject mechanism for a tape player, and in particular, an intermittent gear meshing with a drive gear moves an eject plate back and forth. This relates to a device that raises and lowers a guide arm to which a pack guide is attached using a taper cam provided on an eject plate.

[Technical background of the invention]

In a tape player, when using a cassette, there is a loading operation to suck and lower the cassette to the downward operating position and fix it in the same position.
When taking out a cassette, an eject operation is performed to eject and move the cassette upward to the removal position.

The loading and ejecting mechanism for performing loading and ejecting as described above is composed of a pack guide that supports the cassette in the vertical direction, a pack stopper that supports the cassette in the front and back direction, and a driving portion and a connecting member thereof. Conventionally, such a loading eject mechanism has a structure in which a driving section consisting of a drive gear, an intermittent gear, etc. drives an operating section consisting of an eject plate, a pack guide, a pack stopper, etc. that are interlocked with the eject plate. Widely popular.

The operating part of this mechanism is that the roller (or pin) of the guide arm with the pack guide attached comes into contact with the taper cam provided on the eject plate, so that the guide arm moves according to the back and forth movement of the eject plate. By raising and lowering the cassette (thus raising and lowering the pack guide) and by interlocking the eject arm with the pack stopper attached to the eject plate,
The eject arm is moved back and forth in accordance with the back and forth movement of the eject plate.

The taper cam provided on the eject plate has horizontal parts at the top and bottom, and when the roller (or pin) of the guide arm is fixed to the upper horizontal part, the pack guide is fixed at the ejecting position. The pack guide is fixed in the operating position when the roller (or pin) is fixed to the lower horizontal part. In the operating position, the pack guide and the guide arm are pressed against each other by the force of a spring so as to be held at their reference positions.

In addition, the drive unit is such that an intermittent gear having an intermittent part is engaged with a drive gear that rotates in opposite directions during loading and ejecting in conjunction with the motor, and when loading is completed, the intermittent gear is driven. The driving force transmission is stopped by disengaging the two gears facing each other.

The eject plate of the operating section is connected to the intermittent gear of the drive section, so that the eject plate moves back and forth in accordance with the rotational direction of the intermittent gear. As methods for connecting the two, there are methods such as providing a cam on the intermittent gear and using the cam to guide the eject plate, and providing a rack on the eject plate and meshing the intermittent gear with this rack.

[Problems with background technology]

However, the conventional loading eject mechanism as described above has the following problems.

That is, in the conventional loading eject mechanism as described above, when the loading operation is completed, the driving gear is opposed to the intermittent part and the gears stop engaging. If there is not a certain distance between the drive gear and the
The tips of the teeth come into contact, causing abnormal noise, tooth tip friction, and damage. Therefore, after the end of the gear part of the intermittent gear is separated from the drive gear when the loading operation is completed, by further rotating the intermittent gear by a certain amount, a constant distance can be maintained between the critical end of the intermittent part of the intermittent gear and the drive gear. It is necessary to provide an interval of

Conventionally, as a means for this purpose, there is a method that uses a spring and uses the biasing force of the spring to rotate the intermittent gear by a certain amount via a cam section provided on the intermittent gear. According to the configuration, a series of operating members including the eject plate are connected to the intermittent gear, so that a considerably large load is applied when the intermittent gear is rotated.

Therefore, a spring with a strong biasing force has been used to rotate the intermittent gear against this load. On the other hand, the strong force of the spring means that
This has been a problem because it places a large load on the intermittent gear and each operating member. Further, since the intermittent gear is rotated by bringing the spring into contact with the cam portion of the intermittent gear, there has been a problem in that the durability of the intermittent gear is reduced due to wear of the cam portion.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and its purpose is to improve the rotating means of the intermittent gear so that the intermittent gear can be rotated without using a spring. To provide a loading eject mechanism that eliminates extra load and improves durability by making it possible to provide a constant distance between the end of a gear part and a drive gear.

[Summary of the invention]

The loading eject mechanism according to the present invention includes:
When the cassette is attached to the lower side of the taper cam provided on the eject plate, the guide arm is brought into contact with a roller or pin, and the intermittent gear and the drive gear are moved apart by the force of the spring that biases the guide arm. By providing a biasing portion that presses the eject plate, when loading is completed, the biasing force of the spring applied to the guide arm will cause
The roller of the guide arm presses the eject plate forward via the biasing part to advance the eject plate, which rotates the intermittent gear that is linked to the eject plate, and the end of the gear part of the eject plate rotates. A certain distance is provided between the drive gear and the drive gear.

[Embodiments of the invention]

An example in which the configuration of the loading eject mechanism according to the present invention as explained above is adopted in a device having two eject plates for suction and evacuation and for elevating and lowering is explained in detail based on the drawings. Explain in detail.

In FIG. 1, a drive gear 1 is interlocked with a motor and rotates clockwise in the drawing during loading, and in the opposite direction during ejection. This drive gear 1 is configured to mesh with an intermittent gear 2 having an intermittent part 2a and end parts 2E and 2L on the eject side and loading side facing this, and furthermore, this intermittent gear 2 has a small gear part 2b which will be described later. It is designed to mesh with each rack of the two eject plates. Next to intermittent gear 2 are respective racks 3.
Eject plates 3 and 4 for suction and discharge and for elevating and lowering, which mesh with the intermittent gear 2 at a and 4a, are provided vertically one on top of the other. The suction/ejection eject plate 3 works in conjunction with an eject arm (not shown) to move the pack stopper back and forth. The lifting eject plate 4 is
As will be described later, the pack guide attached to the guide arm is moved up and down in conjunction with the guide arm.

The length of the rack 3a on the side edge of the eject plate 3 for suction and ejection is determined by the movement stroke for suction and the eject plate 4 for elevating and lowering provided below it.
The length is the sum of the movement stroke of , and as described above, it meshes with the small gear portion 2b of the intermittent gear 2. Further, two slide holes 3b are provided at the front and rear ends of the suction/discharge eject plate 3, and a pin 4b of the elevating/lowering eject plate 4 is inserted into each slide hole 3b. As a result, when the suction/evacuation eject plate 3 is behind a predetermined position, it can be slid with respect to the elevating eject plate 4, and when it advances to the predetermined position, a pin 4 is attached to the rear end of the slide hole 3b.
By engaging b, the eject plate 4 for elevating and lowering is engaged.

On the other hand, the eject plate 4 for elevating and lowering
A and a side plate 4B, and the base plate 4A is provided with the aforementioned rack 4a and two pins 4b on the front and rear. The rack 4a of the board 4A has a length corresponding to the stroke required for raising and lowering the guide arm (therefore shorter than the rack 3a of the suction/ejection ejector plate 3).
When the lifting eject plate 4 is in the backward position, it does not engage with the small gear portion 2b of the intermittent gear 2, and the eject plate 3
As a result, the small gear portion 2b is engaged with the small gear portion 2b for the first time by being pressed in the forward direction via the pin 4b.

A tapered cam 5 and two slide holes 4c are provided in the side plate 4B, and each slide hole 4
A pin 6 of a tape player board (not shown) is inserted into c, so that the lifting eject plate 4 can be slid back and forth. The tapered cam 5 has a tapered portion 5a and upper and lower horizontal portions 5.
A projection 5d is formed on the tapered portion 5a side of the lower horizontal portion 5c, and the rear side of this projection 5d is tapered. A guide pin 7a, which is a lifting fulcrum of the guide arm 7, is in sliding contact with the tapered cam 5. This guide arm 7 rotates vertically around a shaft 7b which is a rotational fulcrum at the rear end, and is moved from both upper and lower sides by a spring (not shown) to a reference position for cassette operation (the guide pin 7a is placed in the lower horizontal portion 7c). position).

The large gear portion 1a of the drive gear 1 is engaged with a connecting gear 8 which is rotated in forward and reverse directions by the motor, and is interlocked with the motor via the connecting gear 8. That is, the connecting gear 8 rotates in the opposite direction to the driving gear 1. Further, the shaft 1b of the driving gear 1 is provided at the tip of a connecting arm 9 that rotates around the shaft 8a of the connecting gear 8, and the position of the driving gear 1 is adjusted by the rotation of the connecting arm 3. It is designed to move left and right. The connecting arm 9 has a constant frictional force with the shaft 8a of the connecting gear 8,
When no external force is applied, it rotates in the same direction as the rotation of the connecting gear 8 (therefore, the drive gear 1 moves), and its range of movement is regulated by a member (not shown).

The loading eject mechanism of the present invention having the above-described structure operates as follows.

Cassette unloading position (before loading and after completion of ejecting)...Fig. 1 Before loading the cassette or after unloading the cassette, the drive gear 1 is engaged with the loading side end 2L of the intermittent gear 2. The small gear portion 2b of the intermittent gear 2 is engaged with the tip of the rack 3a of the eject plate 3 for suction and discharge. At this time, remove the two eject plates 3 and 4.
are both in the retracted position, and the pin 4b of the ejector plate 4 for elevating and lowering is located at the tip of the slide hole 3b of the ejector plate 3 for suction and discharge. Moreover, the rack 4a of the lifting eject plate 4 is separated from the small gear part 2b of the intermittent gear 2, and the guide pin 7a of the guide arm 7 in the raised position is connected to the taper cam 5 of the same plate 4.
It is located in the upper horizontal part of.

Note that in this state, since the connecting arm 3 is at the center position, the drive gear 1 is also at the center.

Suction state of cassette...Fig. 2 When the cassette is inserted to a predetermined position and the power is turned on, the motor is driven and the drive gear 1 rotates counterclockwise. As a result, the intermittent gear 2 also rotates counterclockwise, and the suction/discharge eject plate 3 moves forward via the rack 3a. As a result, the eject arm interlocked with the suction/ejection eject plate 3 moves forward, and the cassette is sucked forward via the pack stopper attached to the eject arm.

Further, at this time, the eject plate 4 for elevating and lowering is not engaged with the intermittent gear 2, and the pin 4b can freely slide against the eject plate 3 for suction and discharge from the tip of the slide hole 3b toward the rear end. Therefore, it remains in a stopped state.

The cassette begins to descend...Figure 3 When the suction and discharge ejector plate 3 advances further and reaches the position where the pin 4b of the elevating and lowering ejector plate 4 touches the rear end of the slide hole 3b, the cassette suction stops. finish.

In this state, when the suction/discharge eject plate 3 moves further forward, the slide hole 3b
The rear end is the pin 4 of the lifting eject plate 4
By pressing b, the lifting eject plate 4 is pushed forward.

Lowering of the cassette...Figure 4 As the drive gear 1 rotates further, the upper and lower eject plates 3 and 4 move further forward. At this time,
As the lifting eject plate 4 moves forward, the guide pin 7a of the guide arm 7 moves on the tapered cam 5 of the same plate from the upper horizontal part 5b to the tapered part 5a, and by sliding on this tapered part 5a, Guide arm 7 descends.

Loading completed state...Figures 5 and 6 After the intermittent gear 2 rotates further and meshes with the drive gear 1 at its eject side end 2E, the intermittent part 2a comes to a position facing the drive gear 1. As a result, the drive gear 1 and the intermittent gear 2 are disengaged, and the intermittent gear 2 is stopped. As a result, the upper and lower eject plates 3 and 4 also complete their forward movement. At this point, the rack 3a of the ejector plate 3 for suction and discharge is disengaged from the intermittent gear 2, and the rack 4a of the ejector plate 4 for elevating and lowering is disengaged from the intermittent gear 2.
Only the intermittent gear 2 meshes with the intermittent gear 2.

Further, the guide pin 7a of the guide arm 7 has moved from the tapered portion 5a of the tapered cam 5 of the lifting eject plate 4 to the protrusion 5d (FIG. 5). As mentioned above, since a force is applied to the guide arm 7 from above and below to urge it toward the reference position, the guide pin 7a is positioned on the protrusion 5d, and as a result of being pushed down from the reference position, it is pushed upward. generates a reaction force to With this power,
As a result of the guide pin 7a pressing the protrusion 5d, the guide pin 7a pushes the protrusion 5d forward while entering the tapered shape behind the protrusion 5d, and finally reaches the rear end of the lower horizontal portion 5c, which is the reference position. Moving. As a result, the lifting eject plate 4 is pushed forward, so the intermittent gear 2 that meshes with it further rotates counterclockwise, and there is a constant distance between the eject side end 2E and the drive gear 1. This will result in an interval of . Therefore, the tips of the teeth of the intermittent gear do not come into contact with the drive gear 1, which continues to rotate.

At this time, the connecting gear 8 is rotating counterclockwise, but since it is not receiving the force of the intermittent gear 2, the connecting arm 9 rotates to the right in the figure via its shaft 8a, and therefore the driving gear 1 moves to the right (6th
In this case, as mentioned above, the rack 3a of the suction/discharge ejecting plate 3 is disengaged from the intermittent gear 2, so it can remain stationary regardless of the rotation of the intermittent gear 2. That is, no load is applied to the suction/ejection eject plate 3 and each member interlocking therewith. As described above, according to the present invention, it is possible to rotate the intermittent gear to provide a constant interval without using a spring, and in the conventional loading eject mechanism, the force of the strong spring is applied to each member. It also eliminates the excess load caused by

Start of ejecting...Fig. 7 When the ejecting instruction is given, the connecting gear 8, which had been rotating counterclockwise, reverses.
It will start rotating clockwise. As a result, the shaft 8a
Since the connecting arm 9 rotates clockwise (that is, to the left) via the
It engages with the eject side end 2E of. Therefore,
Since the intermittent gear 2 also rotates clockwise in the opposite direction to that during loading, the small gear portion 2b of the intermittent gear 2
The upper and lower eject plates 3 and 4, which are engaged with each other, also move backward in the opposite direction to that during loading.

Eject state...Fig. 3, Fig. 4 Due to the retreat of the eject plate 4 for elevating,
The guide pin 7a located on the lower horizontal portion 5c of the tapered cam 5 begins to move toward the upper end while being guided by the tapered cam 5 against the force of the spring that urges the guide arm 7 downward. Arm 7 begins to rise. (FIG. 4) After the guide arm 7 has completed its ascent and is fixed at the upper position, the eject plate 4 is moved from the end of the rack 4a to the intermittent gear 2.
It stops when it moves away. (Figure 3) Ejection completed...Figures 1 and 2 When the drive gear 1 rotates further and the suction/discharge eject plate 3 retreats, the eject arm that interlocks with it and the pack stopper attached to it move. It moves forward and the cassette is ejected from the pack guide.

At this point, the motor stops and each member returns to the state shown in FIG.

In this embodiment, a protrusion is provided on the lower horizontal part of the tapered cam, and the rear thereof is tapered, but the shape of the biasing part of the present invention is not limited to this.
Protrusions, grooves, tapered parts, etc. can be selected as appropriate and used individually or in combination.

Further, in this embodiment, a loading eject mechanism using two eject plates is particularly adopted, but the present invention is not limited to this, and both suction and ejection and lifting and lowering of the cassette can be performed using one eject plate. It may be used for things that are done.

Further, the means for connecting the intermittent gear and the eject plate is not limited to a simple one, and a cam may be provided on the intermittent gear and the eject plate may be engaged with the cam.

〔Effect of the invention〕

As explained above, according to the present invention, the simple structure of providing the eject plate with the urging portion using a protrusion, groove, or tapered shape allows the spring applied to the guide arm to be applied when loading is completed. By moving the eject plate forward through this biasing part by force, the intermittent gear and the drive gear can be separated, and the harm caused by contact between the gears can be prevented, so there is no need to use a spring as in the past. It is possible to provide a loading eject mechanism with improved durability without applying extra load to each member.

[Brief explanation of drawings]

1A, B to 7A, B are views showing one embodiment of the loading eject mechanism according to the present invention, in each figure A is a plan view, B is a side view, and FIG. Before loading and when ejecting is completed, Figure 2 shows the cassette being sucked and ejected, Figure 3 shows the cassette starting to descend and completing the ascent, Figure 4 shows the cassette being raised and lowered, Figure 5 shows just before loading is completed, and Figure 6
The figure shows the time when loading is completed, and FIG. 7 shows the time when ejecting starts. DESCRIPTION OF SYMBOLS 1... Drive gear, 1a... Large gear part, 2... Intermittent gear, 2a... Intermittent part, 2b... Small gear part, 2E, 2L
...End part, 3...Eject plate for suction and discharge, 3a
...Rack, 3b...Slide hole, 4...Eject plate for elevating, 4A...Board, 4B...Side plate, 4a...
Rack, 4b...pin, 4c...slide hole, 5...taper cam, 5a...tapered part, 5b...upper horizontal part, 5c...lower horizontal part, 5d...protrusion, 6...pin,
7...Guide arm, 7a...Guide pin, 7b...
Shaft, 8...Connection gear, 8a...Shaft, 9...Connection arm.

Claims (1)

[Claims] 1. A drive gear, an intermittent gear that meshes with the drive gear, and an eject plate that moves back and forth in conjunction with the intermittent gear, and by the back and forth movement of the eject plate,
The guide arm to which the pack guide is attached is raised and lowered, and the guide arm is provided with a spring that biases its tip in the upward direction, and the eject plate is provided with a tapered cam having horizontal portions at the upper and lower ends. ,
A roller or pin provided at the tip of the guide arm is engaged here, and when the cassette is installed, the guide arm is lowered by the taper cam against the force of the rising spring, and the taper cam is lowered by the taper cam. On the lower side, it comes into contact with the roller or pin of the guide arm when the cassette is installed,
A loading eject mechanism characterized in that the eject plate is provided with a biasing portion that presses the eject plate in a direction to separate the intermittent gear and the drive gear by the force of the upward spring.