JPS63104273A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To prevent the correlative positional shifting between a carriage and a screw by providing a disengagement preventing means to prevent the disengagement of a lead pin with a lead groove at one end of the sliding transfer range of the carriage. CONSTITUTION:In case a lead screw 1 rotates and drives even after the carriage 2 contacts the stopping wall of a frame 10, the lead screw 1 causes the lead pin 3 to be pushed up in the direction of arrow C by its own rotation resisting the friction by a preloaded spring 7, however, a stopper 8 fixed on the carriage 2 and a bearing 9 for the lead screw 1 engages with each other, to block the disengagement of the lead pin 3 with the lead groove 1a. Since the engagement of the lead pin 3 with the lead groove 1a of the lead screw 1 is secured even if the rotational driving by the lead screw 1 tends to continued, the rotation of the lead screw 1 is blocked, hence the lead pin 3 can waits for the reversal control of the lead screw 1 being engaged with the lead groove 1a. As a result, the correlative positions of the lead screw 1 and the carriage 2 are not shifted, and the sliding move of the carriage 2 is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head feeding mechanism of a magnetic recording device, and more particularly to a carriage structure that moves by driving a lead screw.

[Conventional technology]

The carriage structure in a conventional magnetic recording device is shown in Figure 5.
The structure was as shown in FIGS. 6 and 7.

FIG. 5 is a perspective view of the main part of a carriage of a conventional magnetic recording device.
A lead pin 13 is fixed to the carriage 12 and is a drive conversion means for engaging with the lead pin 1a and moving the carriage 12 carrying the recording/reproducing head 15 in the direction of arrow A. Further, it has a structure in which it is held by the clamping force of a pressurizing spring 17 fixed to the carriage 12 and the lead pin 13. The carriage 12 is moved in the direction of the arrow A via the lead pin 13 using the guide shaft 14 fixed to the frame 10 at both ends as a guide by the rotating part v1 of the step motor 16 which is integrated with the lead screw 11. be. 6 and 7 are partially enlarged views of the engagement between the lead screw 11, the doped pin 13, and the pressurizing spring 17. In FIG. The lead pin 13 is located on the side of the lead fJ 11 of the lead screw 11.
A is held stationary in an engaged state due to the determination of a pressurizing spring 17. Next, when the carriage 12 is further moved to the inner circumferential side of the recording medium 18 by the rotating portion vJ of the lead screw 11, the leading end portion 12a of the carriage 12 is
However, the carriage 12 stops when it hits the carriage contact portion 10a of the frame 10, but the lead screw 11 continues to rotate, so as shown in FIG. 17, push up the lead pin 13 in the direction of arrow B,
The lead pin 13 separates from the lead groove 11a of the lead screw 11 and reaches the land portion 111 of the lead screw 11. Furthermore, the lead screw 11
When the rotational drive continues, the lead pin 13 again fits into the lead groove 11a, and the small go 13 is rotated.
! : , ) + @ Pij rhyme l) The movement of the 7 series connection between the nidobin 13 and the lead groove IJa being deviated is repeated.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional technology, when the carriage is located at one end of the sliding range of the carriage and the lead screw is rotated by the stepper even after the carriage hits a frame or the like and stops, the contact between the lead pin and the lead groove is When the engagement is disengaged and control to slide the carriage toward the other end of the carriage's sliding range is started, the lead pin will not be located at the land portion of the lead screw even if the lead screw starts to rotate in reverse. Therefore, the carriage is in a stopped state until the lead pins 7 and f17 engage with the lead grooves, and there is a deviation between the original carriage position that should be obtained by the rotational drive of the J-tooth screw and the carriage position. This has the problem that it can occur and become uncontrollable. This posed the risk of the carriage becoming uncontrollable at both ends of the carriage's sliding range.

Therefore, the present invention is intended to solve these conventional problems.Even if the lead screw is rotated after the carriage is located at one end of the sliding range of the carriage and stops against a frame or the like, the lead screw does not rotate. It is characterized by not causing any deviation in the original carriage positional relationship obtained by the rotational drive of the carriage.

[Means to solve the problem]

In order to solve the above problem, the magnetic recording device of the present invention moves a carriage carrying a recording/reproducing head tg and a noI carriage to a predetermined river I in the radial direction of a disc-shaped recording medium.
A lead screw having a lead groove, comprising a pivot shaft and a rotational drive means to be slidably held in the JJ range, and is rotated by being driven by the rotational drive means and has a lead groove, and is engaged with the lead groove;
In a magnetic recording device comprising a lead pin provided on the carriage which slides and moves the carriage to a predetermined position on the medium by being driven by the rotation of the rotating section 117 means, at least the sliding movement range of the carriage is The present invention is characterized in that a disengagement preventing means is provided at one end to prevent engagement and disengagement between the lead pin and the lead groove.

[Effect]

According to the magnetic recording device of the present invention configured as described above,
Even if the lead screw is rotated after the carriage is located at one end of the sliding range of the carriage and stops due to hitting a frame or the like, the lead pin and the lead groove are prevented from engaging and disengaging. The engagement with the lead groove is firmly maintained, the carriage always follows the rotational drive of the lead screw, and a shift in the position of the carriage relative to the rotational drive of the lead screw is prevented.

〔Example〕

An embodiment of the present invention will be described below based on the drawings. FIG. 1 is a vertical cross-sectional view of the main part of the carriage of the magnetic recording device of the present invention. In FIG. The clamping force and both ends of the fixed pressurized spring 7 are held so as to be slidable in the guide direction of the guide shaft fixed to the frame 10. A slight gap 9a is provided between the lead screw 10 and the bearing 9, and the stopper 8 is fixed to the carriage 2 with a screw 21. The gap 9a is provided to be smaller than the engagement depth 1c between the lead pin 3 and the lead groove. Figure 2 is a sectional view of P in Figure 1;
In FIG. 2, when the carriage 2 hits the frame 10 and the lead screw 1 further moves into the rotating part 1j, the rotational force of the lead screw 10 pushes up the lead pin 3 in the direction of arrow C against the force of the pressurizing spring 7. ,
A stopper 8 fixed to the carriage 2 and a bearing 9 of the lead screw 1 are engaged to prevent the lead pin 3 from engaging and disengaging from the lead groove 1a. Even if the lead screw is driven 10 times in this way,
Lead pin 3 and lead screw 1 lead 1ffla
Since the engagement with the lead screw 1 is firmly maintained, the rotational drive of the lead screw 1 is prevented, and the lead pin 3 and the lead groove 1a remain in the engaged state and wait for the next reverse rotation control of the lead screw 1. The carriage 2 can be slidably moved without shifting the interphase position of the carriage 2.

3 and 4 are detailed views of main parts of a carriage according to another specific example of the present invention. In the above-mentioned embodiment, a means for preventing engagement and disengagement between the lead pin and the lead groove is fixed and configured in a part of the carriage. However, in FIG. 3, the engaging portion 8c with the carriage 2
The same effect as described above can also be obtained by fixing the stopper 8a provided with the stopper 8a to the frame 10. Also, the fourth
Even in the structure in which the lead pin 3 escapes in the direction of the arrow in the figure, the stopper 8b is fixedly disposed on the frame 10 and works effectively as described above.

As shown in the embodiments and specific examples, disposing the above-mentioned means for preventing engagement and disengagement between the lead pin and the lead groove at one end of the sliding movement range of the carriage means that the carriage is This has advantages such as being able to check the sliding condition with the help of a person, making it easy to assemble the magnetic recording device.

In the embodiments described above, by providing means for preventing engagement and disengagement between the lead pin and the lead groove on the carriage or the frame, it is effective to prevent the lead screw 1 and the carriage 2 from being misaligned.

〔Effect of the invention〕

As explained above, according to the configuration of the present invention, the relative position between the carriage and the lead screw can be adjusted by a simple structure in which a stopper, which is a means for preventing engagement and disengagement between the lead pin and the lead groove, is provided on the carriage or the frame. It has the effect of preventing misalignment.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of the main part of the carriage of the magnetic recording device according to the present invention, FIG. 2 is a detailed view of FIG.
FIG. 4 is a detailed view of the main parts of a carriage in another specific example of the present invention, FIG. 5 is a perspective view of the main parts of a carriage of a conventional magnetic recording device, and FIGS. 6 and 7 are main parts of a carriage of a conventional magnetic recording device. FIG. ■... Lead screw 2... Carriage 3... Lead pin 4... Guide shaft 5... Head 7... Pressure spring 8... Fist stopper 9...・Bearing 10... Frame or above Xin person SE R Koh Epson Co., Ltd. agent patent attorney 1 person: 1, -1- Ku2; Figure 3 Figure 4

Claims (1)

[Claims] A carriage equipped with a recording/reproducing head, a pivot shaft for slidably holding the carriage in a predetermined sliding range in the radial direction of a disc-shaped recording medium, and a rotational drive means, and is driven by the rotational drive means. a lead screw that rotates and has a lead groove, and a carriage that engages with the lead groove and is driven by the rotational drive of the rotational drive means to slide the carriage to a predetermined position on the medium. In a magnetic recording device composed of lead pins equipped with
A magnetic recording device characterized in that a disengagement prevention means for preventing engagement and disengagement between the lead pin and the lead groove is provided at at least one end of a sliding movement range of the carriage.