JPS6134592Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rapid feed mechanism of a magnetic reproducing device or the like.

In the conventional tape fast-feeding mechanism, the fast-feeding gear or rewinding gear that transmits the rotation of the drive motor to the take-up reel or the supply reel is connected to the gear of the driven section described above at a speed corresponding to the operating speed of the push button operator. They mesh together. As a result of the drive gear rotating at a constant speed gradually engaging the take-up (supply) reel gear having static inertia at the aforementioned operating speed, noise is generated, causing discomfort to the operator. In this meshing, the so-called contact state, which is one step before meshing, continues for a long time, which is a major cause of gear wear and damage. Furthermore, the noise generated from the contact state causes the operator to feel unreasonable distrust of the equipment and is a major cause of loss of reliability. It will be understood that the disadvantages detailed above are noticeable when the operator presses the button slowly.

The present invention has been proposed to solve the above-mentioned drawbacks, and the first purpose is to propose a tape rapid feeding mechanism in which the driving gear meshes with the driven gear in a desirable manner from the beginning of meshing. It is in.

A second object of the present invention is to propose a tape rapid-feeding mechanism having gears that engage almost instantaneously, independent of the operating speed of the push button.

Still another object of the present invention is to propose a tape rapid feeding mechanism that generates less noise and wears less gears during mating.

Other objects and features will be understood from the detailed description of the embodiments.

In FIG. 1, a tape drive system and an operation system are shown, and reference number 1 is a supply reel stand side gear, and 2
is a drive gear driven by rotation of a motor (not shown). The drive gear 2 is transmitted to the take-up reel stand side gear 4 via the intermediate gear 3 by operating a push button 16, which will be described later. The drive gear 2 is supported by a rotating plate 5. The rotating plate 4 rotates around a fulcrum 6 erected on the base plate P,
A biasing force is always applied in the direction of the arrow between a pin 8 that is erected on one end 7 integral with the rotating plate 5 and a fixed pin 10 that is erected on a chassis (not shown) that is separate from the board P. A spring 11 is applied around the fulcrum 6.
Reference number 13 is a cam member whose cam surface abuts against the pin 8 of the rotating plate 5 and blocks the rotating plate.
Reference number 15 is a lever of the cam member 13.

Reference numeral 16 is a push button, and when it is pushed rightward in the drawing, the operation plate 17 is guided by a guide pin/head plate support pin 19 and slides rightward.
Reference number 18 is a long hole for allowing sliding movement. Further, reference numeral 20 is a return spring whose one end is latched to the substrate P. This return spring 20
is activated when the lock pin 22 of the operating plate 17 returns to the illustrated state from the magnetic reproducing mode state in which it is engaged with a known lock plate (not shown).

Now, the lever 1 of the cam member 13 is on the operation plate 17.
A notch 23 is formed for accommodating 5. It is desirable that the size of the notch 23 be approximately proportional to that shown in the drawing, and in a state where the lever 15 is in contact with the right end surface of the notch 23, an appropriate gap is required on the left end surface side of the notch 23. 1st control panel
The position in the figure is designated as P1 in FIG. At this time, the right end surface R1 of the notch 23 is in contact with the lever 15. If the push button 16 is now pressed and moved to position P2, the right end surface moves to R2 and leaves the lever 15. At this time, the left end surface starts contacting the lever 15 at the L2 position. In this state of contact between the notch 23 and the lever 15, a sufficient gap is created on the right side of the lever 15, that is, on the right end surface side of the notch. When the operation plate 17 is further pushed rightward and the left end surface passes L2, the pin 8 moves on the stop surface 14 of the cam member 13 and reaches the cam surface 14'. Therefore, the force of the spring 11 acts as a rotational force on the cam member 13 at once, causing the cam member to rotate clockwise within the aforementioned space until it collides with the right end surface R3. Simultaneously with this operation, the rotary plate 5 is swung clockwise to bring the drive gear 2 on the rotary plate 5 into alignment with the intermediate gear 3. Therefore, regardless of the speed at which the operation plate 17 is pushed by the push button 16, the drive gear 2 is driven by the spring 1.
This means that it meshes with the intermediate gear by the biasing force of 1. This meshing state is maintained by the locking pin 22 being engaged with a locking plate (not shown). Further, when the engagement of the lock plate is released, the operation plate 17 returns to its initial position by the action of the return spring 20. If you explain in detail,
When the operation plate 17 returns to the position P2, the pin 8 reaches the boundary point between the cam surface 13' of the cam member 13 rotating counterclockwise and the stop surface 14, and when the operation plate 17 returns to the position P1, It returns to the initial position on the impact surface 14.

Next, the tape rapid transport mechanism will be explained.

When the push button 30 is pressed, the operation panel 31 displays the drawing (first
(Figure), slide to the right. As shown in FIG. 3, the operation plate 31 has a key-shaped base and a long hole 3.
2, 32, a guide pin 77 is installed upright from the board P.
It slides guided by. A protrusion 34 formed near the elongated hole 32 on the left side engages a pin for operating a gear support plate, which will be described later. The approximately central notch is a cam 35 for moving the head plate, which will also be described later. Reference number 36 is a return spring.

Reference numeral 38 is a support plate that supports the rapid-transfer gear 39, with the pivot point 40 as the center, and the pin 4
1 and 42 are constantly urged to rotate clockwise. The pin 41 mentioned above is provided on the support plate 38, and the pin 42
is provided on a separate chassis (not shown). Further, the pin 45 is provided upright on the support plate 38 and is latched to the protrusion 34 of the operation plate 31. A cam surface 47 is formed on the other end 46 of the support plate 38 and is gradually inclined in the right (rotation) direction. It is locked at a locking point slightly below the cam surface 47.

The head support plate 50 is a frame body that supports the reproduction head 52 in two stable states of contact and separation from the magnetic recording surface of the tape, and includes a frame body portion 53 and an extension portion 5.
Consists of 4. Vertical holes 56, 56 are formed in a portion of the head support plate overlapping with the operation plate 17 to allow vertical movement. On the other hand, a pin 55 is erected substantially above the tip of the extension portion 54 so as to come into contact with the cam surface of the cam 35 .

Due to the above configuration, when the push button 30 is pressed, the operation plate 31 moves to the right. Therefore, the protrusion 34 releases the pin 45 from the locked state. On the other hand, as the operation plate 31 moves to the right, the pin 55 is pushed upward on the cam surface of the cam 35.
The head support plate 50 moves upward. pin 55
To explain the movement of , with reference to FIGS. 4A and 4B, the position of PA is the start position, and the position of PB is the intermediate point. As mentioned above, the protrusion 34 is separated from the pin 45 by the time it reaches the position PB. When the pin 51 rises to the PC position, the support plate 38 is rotated at once by the biasing force of the spring 43 to a position where one point on the cam surface of the cam 47 comes into contact with the pin 51 (FIG. 4A). The inclination angle θ of the cam surface 47 is a factor that determines the rotation angle of the support plate 38, and the smaller the angle θ, the larger the rotation angle.

The gear 39 supported on the support plate 38 meshes with the take-up reel stand side gear 4 all at once by the rotation of the support plate 38, thereby performing rapid feeding. This state is for locking pin 5.
8 is maintained by being locked to a known locking plate. Note that PA', PB', and PC' in FIG. 4B indicate the positions of the pins 55 that move corresponding to PA, PB, and PC, which indicate the positions of the pins 51 in FIG. 4A.

Next, the tape rewinding mechanism will be explained. Now,
When the push button 60 is pressed, the operation plate 61 slides to the right in the drawing. As shown in FIG. 5, the operation plate 61 has holes 62, 62 for allowing movement in the left and right direction.
In order to move the head support plate 50 upward,
A cam 63 is provided with which the pin 55 engages. Further, reference number 64 is a return spring. Reference numeral 65 is a protrusion that locks a pin 68 erected at one end of a support plate 67 that supports a rewinding gear 66 . The support plate 67 has a pin 70 (standing upright on the support plate 67) and a pin 71 centered around a pivot point 69.
(installed upright on the chassis) Spring 72 hung between
Therefore, the rotational force is always applied in the clockwise direction in the drawing. A cam surface 76 that gradually slopes leftward is formed on the other end 75 of the support plate 67, and in the standby state shown in FIG. It is locked at a slightly lower locking point.

Note that the hole 32 on the operation plate 31 and the hole 62 on the operation plate 61 overlap, and share a guide pin 77 erected on the board P.

Now, when the push button 60 is pressed, the operation plate 61 moves to the right, and the protrusion 65 separates from the pin 68.
On the other hand, as the operation plate 61 moves to the right, the pin 55 is pushed upward on the cam surface of the cam 63, so that the head support plate 50 moves upward. The mutual relationship between the movements of the pins 51', 55 and the operation plate 61 will be explained in detail with reference to FIG. pin 5
1' is a head support plate 50 in the order of U1, U2, and U3.
As the value increases, it increases linearly. The point U1 corresponds to the initial position U1' of the operation panel, and when the operation panel 61 reaches the point U2',
The protrusion 65 is spaced apart from the pin 68. At this time, the pin 51' is pushed up to the U2 position. When the operation plate 61 is further pushed and reaches U3', the pin 51' rises to the point U3, so the support plate 6
7 is rotated by the biasing force of the spring 72 to a position where one point of the cam surface 76 comes into contact with the pin 51'. This state is shown in FIG. The rotation angle of the support plate 67 is determined by the inclination angle of the cam surface 76, and the smaller the inclination θ', the larger the rotation angle. When the support plate 67 rotates in the direction of the arrow (FIG. 6), the gear 66 supported by the support plate 67 meshes with the supply reel base gear 1 and rewinds the tape.

It is obvious to those skilled in the art that the rewinding state is maintained by the lock pin 78 engaging with a known lock plate. When the lock plate releases the lock, the operation plate 61 is released from the waiting state by the return spring 64. return to the state. In synchronization with this operation, the head support plate 50 is also pulled downward by a spring (not shown) and returns to the standby state.

Since the present invention is constructed and operates as described above, the spring is energized when the operating plate moves beyond a certain threshold, regardless of the operating speed of the push button.
The driving gear meshes with the driven gear. Therefore, the meshing of the gears is not carried out gradually, but is carried out all at once when a threshold value is exceeded. Therefore, the friction noise, wear, etc. of the gears caused by the process of shifting from the contact state to the meshing state can be sufficiently reduced. In addition, tooth loss can be prevented, and a highly reliable and practical tape feeding mechanism can be provided.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the basic configuration of an embodiment of the present invention, Fig. 2 is a state transition diagram for explaining the operation of the operating plate and the mutual movement of the cam members, and Fig. 3 is a plan view showing the basic configuration of the embodiment of the present invention. ), a plan view showing the configuration of Figure 4 A and B
is a state transition diagram showing the operation of the operation plate (for fast forwarding) and the mutual operation of the head support plate, FIG. 5 is a plan view showing the configuration of the operation plate (for rewinding), and FIG. FIG. 4 is a state transition diagram showing the operation of the head support plate and the mutual movement of the head support plate. Explanation of symbols, 31...operation panel, 34...protrusion,
35... Cam, 38... Support plate, 39... Rapid feed gear, 47... Cam surface, 50... Head support plate,
61... Operation plate, 63... Cam surface, 66... Rewinding gear, 67... Support plate, 76... Cam surface.

Claims (1)

[Claims for Utility Model Registration] 1. The operation plate includes a cam portion that moves the head support plate in a direction substantially perpendicular to the direction of movement of the operation plate, and the head support plate is locked to a locking portion of the head support plate, A support plate for a fast-feeding gear that is prevented from being biased in the meshing direction, the fast-feeding gear support plate having a cam surface that is inclined toward the rotating direction beyond the locking point. With this provision, when the locking portion of the head support plate moves beyond the lowest point of the cam surface, the biasing of the support plate is released and the support plate is rotated in the biasing direction. A magnetic tape fast-feeding mechanism characterized by a configuration in which the fast-feeding gear meshes with a gear on a driven section side. 2. A locking means provided on a fast-transfer gear support plate and a locking piece provided on an operation plate that locks the locking means, and when the operation plate is operated and moved, the rapid-transfer gear support The magnetic tape fast-feeding mechanism according to item (1), further characterized in that the lock is released prior to rotation of the plate. 3. The magnetic tape fast-feeding mechanism according to item 1, further characterized in that the fast-feeding gear is a rewinding gear.