JPS63127455A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To omit tape loading mechanism driving gears to simplify the constitution by using a tape loading mechanism to provide a pinch roll pressing mechanism. CONSTITUTION:When a cam 104 is rotated, a guide plate 3 is moved left and a lever 100 is turned by a rack and a pinion, and a roll 110 and a shaft 102 are moved along a groove 69 to a catcher 68 to draw out a tape 72 from a cassette 71. An arm 17 is turned by the rack and the pinion of a plate 55 connected to the guide plate 3 to draw out the tape 72 by a roll 19. The rack on the take-up side of the guide plate has a part of a lack of teeth, and a lever 34 is turned behind the arm 17, and a supporting plate 41 is led to a groove 67 by a roll 39 and a shaft 42 and is moved to a catcher 2, and a tape approaches a capstan shaft 65 but is not brought into contact with a drum 70 and a roll 39 and is quickly wound up. When the cam 204 is rotated furthermore, the tape is wound at a prescribed angle around the drum 70 and the recording and reproducing state is set. In this constitution, the mechanism is simplified and the number of parts is reduced to miniaturize the device.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic recording/reproducing device in which a tape is pulled out from a cassette and brought into sliding contact with a cylinder drum for recording and reproduction.

(Prior Art) In a magnetic recording/reproducing device such as a video tape recorder or a digital audio tape recorder, recording/reproduction is performed by sliding a tape pulled out from a cassette into sliding contact with a cylinder drum.

Such magnetic recording and reproducing devices require a tape loading mechanism to pull out the tape from the cassette and wind it around the cylinder drum, and also transport the tape at a constant speed by pressing the pulled out tape against the capstan shaft. A pinch roller pressure contact mechanism is required for this purpose.

In a conventional magnetic recording/reproducing device, the tape loading mechanism and the pinch roller pressure contact mechanism described above are provided independently, and the tape loading mechanism is driven by a ring gear provided on the outer periphery of the cylinder drum.

(Problems to be Solved by the Invention) According to the conventional magnetic recording/reproducing device, since it is necessary to provide a tape loading mechanism and a pinch roller pressure contact mechanism independently, the number of parts is large and the mechanism is complicated.

Furthermore, a space for installing a ring gear for driving the tape loading mechanism is required, making the entire mechanism large.

The present invention has been made to solve these conventional problems, and by providing a pinch roller pressure contact mechanism using a tape loading mechanism and eliminating the need for a ring gear, the number of parts can be reduced. It is an object of the present invention to provide a magnetic recording/reproducing device with a simplified configuration and miniaturization.

(Means for Solving the Problems) The present invention provides a slide plate that is slid by a drive source, a first rank plate that is moved by this slide plate, and a first rack plate that is driven by this first rack plate.
a first guide roller moving means that has a rotating gear and moves one guide roller support plate by the first rotating gear; a second rack plate that is moved by the slide plate; A second guide roller moving means that has a second rotating gear driven by the plate and moves the other guide roller support plate by the second rotating gear, and is engageable with the second guide roller moving means. The present invention is characterized in that it has a pinch roller arm that has an engaging portion and is moved close to the capstan shaft by the guide roller moving means.

(Function) The first and second rack plates are moved by the sliding of the slide plate, the first and second rotating gears are driven, and the first and second guide roller moving means move the two guide roller support plates. Move it and perform tape zeroing. By the operation of the second guide roller moving means, the pinch roller arm that engages with the second guide roller moving means moves to the vicinity of the capstan shaft.

(Example) Hereinafter, an example of a magnetic recording/reproducing apparatus according to the present invention will be described with reference to the drawings.

1 to 5, the chassis 1 is rotatably provided with a cylinder drum 70 having a built-in rotary magnetic head, and the cylinder drum 70 is sandwiched between the take-up side catcher 2 and the supply side. catcher 6
8 is fixed on the chassis 1. However, in Figure 1,
In FIG. 2, the chassis 1 is omitted. A slide plate 3 is supported on the lower side of the chassis 1 so as to be slidable in the left-right direction.

As shown in FIG. 9, the slide plate 3 has a bifurcated left side, and has a pin 4 at the base of the fork, a bent part 3a at the end of one arm of the fork, and a bent part 3a at the end of the other arm. A support shaft 11 is provided at the end of the arm, a connecting shaft 5 is provided at the center in the left-right direction, and a guide shaft 7.9 is provided at the right end.

In FIGS. 1 to 5, a winding-side rack plate 6 as a second rack plate is stacked on the upper surface of the slide plate 3,
A spring receiver 8 is provided by fitting the guide grooves 6b and 6c of the rack plate 6 into the guide shaft 7.9 of the slide plate 3. A tension spring 10 is applied between the rack plate 6 and the bent portion 6a, so that the rack plate 6 is biased to the left in FIG.

As shown in FIG. 5, a retaining ring 12 is fitted to the upper end of the support shaft 11 of the slide plate 3 passing through the guide groove of the chassis 1, so that the slide plate 3 is slidably supported.

A supply side rack plate 13 as a first rack plate is also stacked on the left end of the slide plate 3, and the guide shafts 14 and 15 formed on the rack plate 13 fit into the guide grooves of the slide plate 3. The rack plate 13 is held movably in the left-right direction within the range of the guide groove. A tension spring 16 is applied between the shaft 15 and the bent portion 3a of the slide plate 3, and the rack plate 13 is biased to the left in FIG.

1, 2, and 4, a guide shaft 31 is fixed to the chassis 1 on the side of the rack plate 6, and a support shaft 30 is fixed to the chassis 1 passing through the guide shaft 31. As shown in FIG. A guide roller arm 17 having a guide roller 19 attached thereto is rotatably attached to the guide shaft 31. The guide roller 19 is rotatably held by a guide roller shaft 18 attached to the guide roller arm 17.

A gear portion 17a is formed at the base of the guide roller arm 17. The guide roller shaft 18 has an engagement groove 18 around its periphery.
a is formed. A pinch roller arm 22, which will be described later, is fitted into this engagement groove 18a to position the arm 22 in the vertical direction.

A pinch roller arm auxiliary plate 21 is attached to the guide shaft 31 with a washer 20 interposed above the guide roller arm 17.
A pinch roller arm 22 is rotatably fitted. As shown in FIG. 10, the pinch roller arm 22 has a pinch roller 23 rotatably held in the middle part of one arm by a pinch roller support shaft 24.
The tip of the arm is bent into an arc shape to form an engaging portion 25. A spring locking pin 27 is fixed to the other arm portion of the pinch roller arm 22. A spring locking pin 26 is fixed to the pinch roller arm auxiliary plate 21. A spring 28 is hung between this pin 26 and the above pin 27,
Due to the biasing force of the spring 28, the side surface of the pinch roller arm 22 comes into contact with the pin 26, so that the auxiliary plate 21 and the pinch roller arm 22 can temporarily rotate together. A pressing plate 29 is attached to the support shaft 30 to prevent the pinch roller arm 22 from being removed.

In FIGS. 1, 2, and 4, a guide shaft 32 is held on the support shaft 30 below a guide shaft 31, and this guide shaft 32 drives a guide roller driving gear that forms a second rotating gear. 33 and a lever 34 for moving the winding side guide roller are rotatably attached. A protrusion 34a is formed at the base of the lever 34, and by fitting the protrusion 34a into a correspondingly shaped hole of the guide roller drive gear 33, the gear 33 and lever 34 can rotate together. can. A shaft 35 is provided at the free end of the lever 34, and a connecting arm 36 is pivotally mounted by this shaft 35. Lever 34 and connecting arm 3
6 constitutes a second guide roller moving means. A spring receiver 38 is screwed into the threaded portion formed at the lower end of the support shaft 30, and the coil spring 37 received by the spring receiver 38 urges the guide shaft 32 upward, and the gear 33 This eliminates play between the lever 34 and the lever 34.

The connecting arm 36 connects the lever 34 and the guide roller support plate 41, and the connecting arm 36 and the guide roller support plate 41 are pivotally connected by a shaft 42 passing through a guide groove 67 of the chassis 1. Guide roller support plate 41
is located on the top side of the chassis 1 and has a guide roller 39 for guiding the tape and an inclined pole 40 for guiding the tape at a predetermined angle with respect to the cylinder drum 70. A regulating plate 44 is fixed on the chassis 1 for vertically positioning the guide roller arm 17 at the end of loading.

An engaging portion 45 is provided on the pinch roller arm auxiliary plate 21 in a protruding manner.

A spring 54 is hung between the pinch roller arm 22 and the bent portion 55b of the overlapping plate 55 for urging the arm 22 to rotate counterclockwise in FIG. The overlapping plate 55 is located on the upper side of the chassis 1 and is connected to the slide plate 3 by a connecting shaft 5 attached to the slide plate 3. A guide roller arm driving rack plate 56 is slidably mounted on the overlapping plate 55. A shaft 57 and a guide pin 58 are fixed to the rank plate 56, and the shaft 57 and the guide pin 58 are respectively fitted into guide grooves 60.61 formed in the overlapping plate 55 and allowed to fit in the guide grooves 60.61. You can move left and right as far as you want. The rank plate 56 has a rack portion 56a, and this rack portion 56a meshes with a gear portion 17a formed at the base end of the guide roller arm 17. A spring 59 is hung between the bent portion 55b of the overlapping plate 55 and the shaft 57, and the rack plate 56 is biased to the left by this spring 59.

As shown in detail in FIG. 2, the take-up side rack plate 6 has a moving rack part 62 on the right side that can be engaged with the guide roller driving gear 33, and a return part 62 that can be engaged with the gear 33 on the right side. A rack part 63 is provided on the left side, and a toothless part 64 is formed between these rack parts 62 and 63.

In FIG. 1, reference numeral 65 is a capstan shaft. The chassis 1 is provided with a groove 66 for guiding the movement of the guide roller shaft 18 and regulating its clockwise rotation position.
is formed. The chassis 1 also has a guide groove 67 into which the guide roller 39 and the shaft 42 are fitted to guide the movement of the guide roller support plate 41, on the right side of the cylinder drum 70 and toward the winding-side central groove 2. It is formed. The chassis 1 further includes a guide roller 11.
A guide groove 69 into which the shaft 112 and the guide roller support plate 109 are fitted is formed on the left side of the cylinder drum 70 toward the supply side catcher 68.

In FIGS. 1 and 5, the chassis 1 includes a slide plate 3.
A shaft 108 is attached between the two forks, and a lever 100 for moving the supply side guide roller is attached to this shaft 108.
is rotatably fitted. A protrusion 100a is provided at the base of the lever 100.

A supply-side guide roller driving gear 101 serving as a first rotating gear is rotatably fitted on the shaft 108 below the lever 100. A shaft 103 is fixed to the free end of the lever 100, and a connecting arm 102 is pivotally connected by this shaft 103. lever 100 and arm 102
constitutes a first guide roller moving means. A guide roller support plate 109 is pivotally attached to the other end of the connecting arm 102 by a shaft 112.

A guide roller 110 for guiding the tape is rotatably supported on the guide roller support plate 109, and an inclined pole 111 for guiding the tape wound at a predetermined angle with respect to the cylinder drum 70 is attached. There is.

A rotary cam 104 is rotatably fitted onto the shaft 108. The rotating cam 104 is rotationally driven by a motor as a driving source (not shown), and as shown in detail in FIG. 6, the cam groove 104a that engages with the pin 4 of the slide plate 3 has a spiral shape. It is formed over a range of 360°. A contact piece (not shown) is provided on the bottom surface of this cam 104, and this contact piece connects to the circuit board 106 (
The rotational position of the cam 104 is detected by slidingly contacting the conductive pattern surface of the cam 104 (see FIG. 5). The rotational position of the cam 104 is rsTOPJ rHA as shown in FIG.
The positions are LFJ rPAUSE J rPLAYJ. Note that the gear 101 and the cam 104 are integrally connected. A circuit board 106 is fixed to a shaft 108. The gear 101 meshes with a rack portion 13a provided on the supply side rack plate 13.

In FIG. 1, reference numeral 72 denotes a magnetic tape, and this magnetic tape 72 is housed in a tape cassette 71.

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

FIG. 1 shows the state before tape loading, in which a tape cassette 71 is loaded, and the pinch roller 23 and guide roller 19 are located inwardly from the tape 72 that crosses the recess formed on one side edge of the cassette 71. , guide roller 39
．． 110, inclined balls 40, 111, etc. are located.

At this time, the pin 4 of the slide plate 3 is in the rsTOPJ region of the cam groove 104a of the rotary cam 104. The engaging portion 25 of the pinch roller arm 22 is brought into contact with the guide roller support plate 41 by the biasing force of the spring 54.

1, 2, 3, and 6, when the rotary cam 104 is rotated counterclockwise by a motor (not shown), the bottle 4 is pushed into the cam groove 104a and the guide plate 3 is slid to the left in FIG.

Since the supply side rack plate 13 is attached to the slide plate 3, the rack plate 13 also moves to the left, causing the supply side guide roller drive gear 101 to rotate counterclockwise. The gear 101 is rotatably integrated with the supply side guide roller moving lever 100 through the protrusion 100a, so the lever 101
0 also rotates counterclockwise. As the lever 100 rotates, the guide roller support plate 109 is pushed through the connecting arm 102, and the guide roller 110 and shaft 102 are moved into the guide groove 6.
The guide roller support plate 109 moves toward the supply side catcher 68 while being guided by the guide roller 1
10 pulls out the tape 72 from the cassette 71.

Further, a stacking plate 55 is integrally connected to the slide plate 3 via the connecting shaft 5, and a rack plate 56 for driving the guide roller arm is attached to the stacking plate 55. 56a and guide roller arm 17
The guide roller arm 17 is rotated clockwise by engagement with the gear portion 17a, and the tape 72 is pulled out from the cassette 71 by the guide roller 19 on the arm 17.

On the other hand, a winding-side rack plate 6 is attached to the slide plate 3, and as the slide plate 3 slides, the rack plate 6 also moves to the left, but the rack plate 6 is not provided with a toothless portion 64. Therefore, the rank portion 62 is the guide roller driving gear 3.
The take-up side guide roller driving lever 34 does not rotate until it engages with the lever 34, and the lever 34 rotates with a delay with respect to the movements of the lever 100 and the guide roller arm 17. When the lever 34 starts to rotate, the guide roller support plate 41 is pushed through the connecting arm 36, and the guide roller 39 provided on the support plate 41 and the shaft 42 are guided by the guide groove 67. By this, it is moved toward the catcher 2 on the winding side. This movement of the guide roller support plate 41 pushes the engaging portion 25 of the pinch roller arm 22, causing the arm 22 to rotate clockwise.

When the rotating cam 104 rotates, the operating state shown in FIG. 7 is achieved. The rotational position of the rotary cam 104 is detected by the sliding contact between the contact piece provided on the lower surface of the rotary cam 104 and the conductive pattern of the circuit board 106. This position is the so-called stop mode position, in which the tape 72 is in the middle of loading and does not contact the cylinder drum 70, and
Since the tape 72 can be transported at high speed under a light load without contacting the three guide rollers, high-speed winding (FF) and high-speed rewinding (REW) are also performed at this position. In this position, the shaft 18 of the guide roller 19 is in the groove 6.
6, and the guide roller arm 1
Since the vertical position of 7 is regulated by a regulating plate 44, the guide roller 19 is regulated to a normal position, and there is no movement of the guide during tape running, and stable tape running is performed.

In order to set the recording/reproducing position in the above manner, the rotary cam 104
is further rotated counterclockwise in FIG. When the cam 104 further rotates counterclockwise, the slide plate 3 further moves to the left from the position shown in FIG. 7, and the guide roller support plate 41.109 further moves toward the catcher 2.68. The rotating cam 104 rotates until the rPLAY, l areas of the cam groove 104a reach the position of the pin 4 of the slide plate 3. Pin 4 is rPLAY of rotating cam 104
Before the guide roller 110 reaches the J position, the catcher 68
Since the lever 100 cannot rotate any further, the rack plate 13 that engages with the gear 101 cannot move any further to the left. Therefore, only the slide plate 3 slides to the left, and the spring 16 It is further energized. The biasing force of the spring 16 provides a pressing force of the guide roller support plate 109 against the catcher 68.

On the other hand, since the guide roller 19 does not move any further because its shaft 18 comes into contact with the end of the groove 66, the guide roller arm 17 also does not rotate. With this, Rerasoku board 5
6 stops moving to the left, and in response, the overlapping plate 55 moves to the left together with the slide plate 3, so the spring 59 is further biased, and this biasing force acts as a biasing force for positioning the guide roller 19. becomes.

Further, the lever 34 is rotated by the moving rack part 62 of the winding side rack plate 6, and the lever 34 is rotated by the moving rack part 62 of the winding side rack plate 6.
further moves while being guided by guide a67,
The pinch roller arm 22 also rotates due to the engagement between its engaging portion 25 and the guide roller support plate 41. When the guide roller support plate 41 moves close to the catcher 2, the engaging portion 45 of the pinch roller arm auxiliary plate 21 advances onto the left side of the bent portion 55a of the overlapping plate 55 and onto the movement path of the bent portion 55a. Therefore, as the overlapping plate 55 moves to the left, its bent portion 55a pushes the engaging portion 45 to rotate the auxiliary plate 2I clockwise, thereby accumulating the spring 28. This spring 2
8, the pinch roller arm 22 is rotated clockwise, and the engaging portion 25 of the arm 22 is separated from the guide roller support plate 41, as shown in FIG.

The rotation of the arm 22 causes the pinch roller 23 to press the tape 72 against the capstan shaft 65, and then the spring locking pin 26 and the arm 22 are separated and the spring 28 is expanded, so that the tape 72 is pressed against the capstan shaft 65. A predetermined pressing force of the pinch roller 23 is obtained.

In this manner, after the guide roller 39 has been positioned in contact with the catcher 2, the spring 10 (see FIG. 2) expands, so that a predetermined pressing force of the guide roller 39 against the catcher 2 is obtained. At this position, the pinch roller arm 22 fits into the engagement groove 18a of the shaft 18, so that the arm 22 is positioned in the vertical direction (see FIGS. 4 and 8), and the tape runs stably. In this way, each member
In the state shown in the figure, the tape 72 is wound around the cylinder drum 70 at a predetermined angle and enters the recording/reproducing state.

When the rotary cam 104 is returned clockwise in FIG. 6 from the recording/reproducing state to bring the "r PAUSE" area to the position of the pin 4, the pause state is entered. In this pose state, the slide plate 3 moves to the right from the recording/reproduction state shown in FIG. 8, the bent piece 55a of the overlapping plate 55 moves to the right, and the pinch roller arm auxiliary plate 21 rotates counterclockwise. Accordingly, the pinch roller arm 22 is rotated by the spring 54, and the pinch roller 23 is separated from the capstan shaft 65. It remains in contact with Koccha 2.68. Therefore, the tape 72 remains wound around the cylinder drum 70 and is not transported.

The unloading operation of winding the tape 72 into the cassette 71 is performed by the reverse operation of the loading operation described above. In this case, the return rack part 63 of the winding side rack plate 6 causes the winding side guide roller lever 3 to
4 can be returned to its original position.

According to the above embodiment, the guide roller support plates on the supply side and the winding side are moved along the guide grooves by the sliding operation of the slide plate, so that the guide roller support plates on the supply side and the winding side are moved along the guide grooves. There is no need to move the roller support plate, and since the pinch roller arm is moved to the vicinity of the capstan axis by the guide roller moving means, and the guide roller moving mechanism and the pinch roller moving mechanism are interlocked, it is not necessary to move the roller supporting plate. There is no need to provide these mechanisms separately, and therefore,
It is possible to provide a magnetic recording and reproducing device with a reduced number of parts and a simplified and compact mechanism. Furthermore, since each lever is rotated by the rack plate, the rotation angle of each arm can be freely set by adjusting the radius ratio of the rack and the rotating gear. Since the pressing force of the pinch roller against the capstan shaft is obtained by the bent portion 55a at one end of the overlapping plate 55, the timing of pressing and separating the pinch roller can be determined easily. Since the axes around which each arm rotates are consolidated, each arm occupies less space, making the entire device smaller and requiring fewer parts.

Note that the pinch roller arm 22 may be engaged with a member that is substantially integral with the guide roller support plate 41, such as the shaft portion of the guide roller 39.

(Effects of the Invention) According to the present invention, since the guide roller support plates on the supply side and the winding side are moved along the guide grooves by the sliding operation of the slide plate, the outer peripheral part of the cylinder drum There is no need to move the guide roller support plate using the ring gear, and the pinch roller arm is moved to the vicinity of the capstan axis by the guide roller moving means, so that the guide roller moving mechanism and the pinch roller moving mechanism are linked. There is no need to provide these mechanisms separately and independently as in the past, and it is therefore possible to provide a magnetic recording and reproducing device with a reduced number of parts and a simplified and compact mechanism.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the magnetic recording/reproducing apparatus according to the present invention, showing the state before tape loading, FIG. 2 is a plan view showing a part of the same embodiment, and FIG. 3 is the above-described plan view. 4 is a side sectional view of the take-up side guide roller portion of the above embodiment, FIG. 5 is a side sectional view of the supply side guide roller portion of the above embodiment, and FIG. 6 is a side sectional view of the feed side guide roller portion of the above embodiment. FIG. 7 is a plan view showing the state of the tape loading in the above embodiment; FIG. 8 is a plan view showing the recording/reproducing state of the above embodiment; FIG. 9 is a plan view showing the above embodiment. FIG. 10 is a plan view showing the slide plate inside, and FIG. 10 is a plan view showing the pinch roller arm in the above embodiment. 3...Slide plate, 6...Second rack plate, 13
...first rack plate, 22...pinch roller arm,
25...Engaging portion, 33...Second rotating gear, 34.
36...Second guide roller moving means, 41...Guide roller support plate, 65...Capstan shaft, 100.
102...first guide roller moving means, 101
...First rotating gear, 109 ... Guide roller support plate. Noro D Shaku no Iθ 1〇 Q

Claims (1)

[Claims] a slide plate that is slid by a drive source; a first rack plate that is moved by the slide plate;
a first guide roller moving means having a first rotating gear driven by the first rack plate and moving one guide roller support plate by the first rotating gear; and a first guide roller moving means that is moved by the slide plate. a second guide roller moving means having a second rack plate and a second rotating gear driven by the second rack plate and moving the other guide roller support plate by the second rotating gear;
A magnetic recording/reproducing device comprising: a pinch roller arm having an engaging portion capable of engaging with the second guide roller moving means and moved to the vicinity of the capstan shaft by the guide roller moving means.