JPH0693313B2 - Carriage drive mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a carriage driving mechanism, and more specifically,
The present invention relates to a carriage drive mechanism of a type in which a pin protruding from the carriage is fitted in a screw groove of a screw shaft arranged along the carriage and the carriage is moved by rotation of the screw shaft.

[Prior Art] This type of conventional carriage drive mechanism is often adopted as a drive mechanism of a head carriage of a magnetic disk drive, for example.

In this type of drive mechanism, it is necessary to securely hold the pin on the carriage and the thread groove of the screw shaft so that the engagement between the pin and the thread groove surface is always constant.

Therefore, in the conventional art, a leaf spring is fixed to the carriage side, and this leaf spring applies an urging force to the screw shaft side to the pin so that the engagement state between the pin and the screw groove can be maintained. Was there.

Further, this kind of carriage drive mechanism requires accurate positioning of the magnetic head with respect to the magnetic disk when it is used, for example, for head feeding of a magnetic disk device, and thus requires position adjustment of the screw shaft and a motor integrated therewith. Become.

Therefore, in the past, for example, the screw shaft was supported by a common frame, and the frame was mounted on the substrate on a fork part that was previously provided with respect to the mounting frame while the position of the frame was adjustable along the axis of the screw shaft. The eccentric pin provided in the above is engaged, and the frame is finely moved through the fork portion by the eccentric pin to adjust the positions of the motor and the screw shaft.

[Problems to be solved by the invention] By the way, if a fork is provided on the frame side and an eccentric pin is provided on the chassis side for positioning the screw shaft and the motor, these adjusting members maintain uniform quality accuracy. However, it is expensive, and there is a problem in that the cost is significantly increased when the mounting work is taken into consideration.

Accordingly, it is an object of the present invention to provide a carriage drive mechanism which surely adjusts the position of a motor and a screw shaft integrated with the motor by a simple and inexpensive means.

[Means for Solving the Problems] In the present invention, in order to achieve this object, a pin is provided on a carriage that is movably guided on a substrate, and the pin is a screw shaft rotated by a motor. In a carriage drive mechanism that drives a carriage by engaging with a screw groove of the device, two pins that support the motor and the screw shaft and project along the axis of the screw shaft are provided on the substrate of the device. A frame, which is fitted in the two elongated holes formed along the guide direction of the carriage and is positionally adjustable to the substrate, and a frame formed between the two elongated holes on the substrate. A jig mounting hole is provided, and when adjusting the position of the frame with respect to the substrate, the jig is rotatably mounted in an eccentric state with respect to the hole and is attached to either of the two pins. Choice By adopting a structure in which the above-mentioned position adjustment can be performed by bringing them into physical contact with each other.

[Operation] According to such a structure, the position of the frame with respect to the board is adjusted by mounting the jig in the jig mounting hole of the board and rotating the jig to selectively contact one of the two pins. The position of the motor and the screw shaft supported by the frame can be adjusted with certainty. Since the position is adjusted by a jig prepared separately from the carriage driving mechanism, it does not cost much.

[Examples] Hereinafter, details of the present invention will be described based on Examples shown in the drawings.

FIG. 1 and the following figures are for explaining one embodiment of the present invention. In the drawings, reference numeral 1 is a chassis substrate, and a frame 4 supporting a motor and a screw shaft is arranged below the substrate 1 in an overlapping manner. .

The frame 4 has left and right support frames 4a and 4b which are exposed upward through an opening formed in the substrate 1.

A screw shaft 8 is rotatably supported between the support frames 4a and 4b, a motor 9 is fixed to the outer side of the support frame 4a, and the output shaft and the screw shaft 8 are connected to each other.

The motor 9 is a stepping motor for head feeding.

On the other hand, on the frame 4 which is stacked on the lower side of the substrate 1, pins 3a and 3b are provided so as to project on the same axis line along the screw shaft 8. These pins 3a and 3b are also the same axis along the screw shaft 8. It is slidably fitted in the long holes 2a, 2b of the substrate 1 formed on the lines.

Further, screws 5a and 5b are fitted in the long holes 2a and 2b, and the frame 4 and the substrate 1 are fixed by the screws 5a and 5b.

Further, a protruding piece 4c is provided on the support frame 4a side, and the protruding piece 4c is fixed on the substrate 1 via a screw 7.

On the other hand, the reference numeral 10 shows the whole head assembly,
It is mounted on the carriage 11.

The carriage 11 is guided by a guide shaft 12 arranged in parallel with the screw shaft 8 on the substrate 1 via the support frame 11a.

A mounting portion 11b is projectingly provided on a side surface of the carriage 11 on the screw shaft 8 side, and a pin 13 is projectingly provided on the mounting portion 11b at an angle corresponding to the inclination of the screw groove 8a of the screw shaft 8. It is fitted into the screw groove 8a from above.

The pin 13 is a metal pin.

Similarly, an elastic piece 11c is provided below the side surface of the carriage 11 on the side of the screw shaft 8 so as to contact the lower side of the screw shaft 8 and sandwich the screw shaft 8 together with the pin 13.

The elastic piece 11c is integrally molded when the carriage 11 made of synthetic resin is molded.

The plate thickness of the elastic piece 11c is determined according to the material used so as to have required elasticity and strength.

Polycarbonate or the like is suitable as the material of the carriage 11, and using this material is also convenient for obtaining compensation of the position of the head against expansion and contraction of the magnetic disk due to temperature change.

On the other hand, a through hole 6 is formed in the substrate 1 between the long holes 2a and 2b as shown in FIG.

In the through hole 6, a disc-shaped jig 14 as an adjusting member is rotatably supported at its eccentric position.

The support shaft is indicated by reference numeral 6a.

Next, the operation of this embodiment configured as described above will be described.

When the motor 9 is rotated, the screw shaft 8 is rotated, and the carriage 11 is moved by the screw drive principle via the pin 13.

At this time, since the screw shaft 8 is supported from below by the elastic piece 11c, the pin 13 is fitted into the screw groove 8a and is securely held in the engaged state. On the other hand, if you want to adjust the head position, loosen the screws 5a, 5b and 7 and
Is rotated and brought into contact with either of the left and right pins 3a, 3b, and the screw shaft 8 and the motor 9 are passed through the frame 4 so that the reproduction level from the head assembly becomes maximum at a predetermined track position with respect to the reference disk. To adjust the relative position of the head assembly 10.
The frame 4 may be fixed to the substrate 1 by tightening b and 7. Since the structure as described above is adopted, the engagement state of the pin and the thread groove of the screw shaft can be always set uniformly, and the position adjustment of the motor and the screw shaft can be reliably performed.

In the above-described embodiment, the case where the present invention is applied to the drive mechanism of the magnetic head carriage is shown, but the present invention can also be applied to the drive mechanism of the carriage of the recording head in the printer and other carriages.

EFFECTS OF THE INVENTION As is clear from the above description, according to the present invention, a pin is provided on a carriage that is movably guided on a substrate, and the pin is engaged with a thread groove of a screw shaft rotated by a motor. In a carriage drive mechanism that drives the carriage by combining them, two pins that support the motor and the screw shaft and project along the axis of the screw shaft are provided on the substrate of the device in the guide direction of the carriage. A frame that is positionally adjustable on the board in a state where they are fitted in two elongated holes formed along each of the holes, and a jig for mounting jigs formed on the substrate between the two elongated holes. A hole, and when adjusting the position of the frame with respect to the substrate, a jig is rotatably attached in an eccentric state to the hole and selectively comes into contact with either of the two pins. As a result, the structure capable of performing the position adjustment is adopted, and therefore the position of the motor and the screw shaft is surely adjusted by the jig separately prepared from the carriage drive mechanism by the extremely simple and inexpensive structure. The excellent effect of being able to be obtained is obtained.

[Brief description of drawings]

1 is a plan view of a drive mechanism, FIG. 2 is a front view of the drive mechanism, FIG. 3 is an enlarged plan view of essential parts, and FIG. 5 is a plan view of the drive mechanism. FIG. 1 ... Substrate, 2a, 2b ... Slot 3a, 3b ... Pin, 4 ... Frame 4,4b ... Support frame, 5, 5b, 7 ... Screw 6 ... Through hole, 8 ... Screw shaft 8a …… Screw groove, 9 …… Motor 10 …… Head assembly 11 …… Carriage, 11c …… Elastic piece 13 …… Pin

Claims (1)

[Claims] 1. A carriage drive mechanism for driving a carriage by providing a pin on a carriage movably guided on a substrate and engaging the pin with a thread groove of a screw shaft rotated by a motor, wherein the motor is a motor. And two pins, which support the screw shaft and project along the axis of the screw shaft, are respectively fitted in two elongated holes formed in the substrate of the apparatus along the guide direction of the carriage. And a jig mounting hole formed between the two elongated holes on the substrate, the frame being mounted on the substrate so that the position of the frame can be adjusted. A jig is rotatably attached to the hole in an eccentric state,
A carriage drive mechanism characterized in that the position can be adjusted by selectively contacting one of the two pins.