JP2007035206A - Transfer mechanism device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transfer mechanism device which improves the durability of reciprocating movement by bringing a rack in contact with a transfer screw groove having a rib for preventing distortion into contact with an outer wall of a guide rib erected on a table and a tray, bringing the rack into press-contact with a transfer screw by an elastic body and minimizing the distortion of a hinge, prevents the rack from being deformed and damaged by distortion caused by gear tooth jump due to an impact, reduces abnormal sound by molding the rack part and the hinge part integrally with resin, and provides reduced cost by reducing the number of components. <P>SOLUTION: A rack 107 is mounted so as to fix and sandwich a rack spring 111 to slidable shafts 104 for moving a motor 102 provided with a transfer screw 103 and the table 109 along the transfer screw, and the table 109 to form a unit 113, and shaft holes of the table 109 are inserted to the slidable shafts 104. A torsion prevention guide rib 108 and a rack guide rib 110 are incorporated so as to come into contact with each other to prevent rack hinges 112 from being deformed and damaged. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention particularly relates to racks, among components used for DVD, CD, MD pickups such as moving trays, tables, audios, information devices, etc., and feed mechanism devices such as industrial devices, which are incorporated in electronic devices. The present invention relates to a technique for improving the strength of the machine.

  In conventional table and tray feed mechanism devices, abnormal noise is generated when the table or tray is moved due to friction between the rack of metal parts and the feed screw, and the durability of the hinge that supports the rack part during reciprocating movement of the table or tray Concerns about the performance, and tooth jumping occurred due to impacts such as dropping, causing deformation and destruction of the rack due to a large twist of the hinge supporting the rack part.

  As shown in FIG. 4, conventionally, in a feeding mechanism device in a media take-out table or tray incorporated in an electronic device or an audio / information device pickup 405, the pickup 405 is moved along the sliding axis of the sliding shaft 406. And a rack 402 in contact with the rack, a rack hinge spring 403 that supports the rack portion, and a rack pressing spring 404 that presses the rack 402 against the feed screw 401.

  The rack 402 and the rack hinge spring 403 are formed by using a plurality of thin metal plates, or the rack hinge spring 403 is configured by integrally forming the rack 402 by outsert molding using a thin metal plate. However, the deformation and destruction of the hinges that support the racks due to abnormal noise generated from the rack part or impacts such as dropping have not been solved yet because the stress applied to the hinges is not sufficiently reduced (see Patent Document 1).

  In FIG. 5, the pickup 17 is locked by a slit formed on the outer shape and a sliding shaft, and a gear is attached to the shaft of the drive motor to move the pickup 17 and meshed with the gear 11. As a result, the feed screw 8 engaged with the gear 11 is rotationally driven.

  The rack portion 13 is engaged with a pickup 17 and a metal thin plate spring plate 12, and the pickup 17 is moved by rotating the feed screw 8. A thin metal plate spring 23 is attached to the lead screw holder 10 with a fixing screw 25, and the tip 23A of the spring 23 is bent upward and inclined. On the other hand, the rack portion 7 is provided with a convex portion 22 that is integrally molded, and is inserted through the hole of the spring plate 12 and fixed integrally by welding or the like. Reference numeral 24 denotes the welding mark. By adopting such a structure, the pickup moves suddenly due to an impact such as a drop in transportation, and the convex portion 22 of the rack portion 13 is elastically fixed so as to dive under the spring 23 and is damaged. It is preventing.

  However, the stress due to the impact of the rack portion 13 and the spring plate 12 supporting the rack portion 13 can be reduced only by the interval at which the convex portion 22 of the rack enters the portion of the spring 23. However, in the interval where the spring 23 of the feed screw 8 is not applied, it is insufficient as a measure for the deformation and breakage of the spring plate 12 caused by the concern about the durability during reciprocating motion and the tooth jump caused by the impact of dropping or the like ( Patent Document 2).

  Further, in FIG. 6, the pickup 1 which is a feed mechanism device is fixed by two support portions 2 a and 2 b and a holder 2 holding the feed screw 4, and the feed screw 4 and the two screws 2 a and 2 b are The meshing rack 3 is formed integrally with the holder 2. Further, both ends of the feed screw 4 are supported by stoppers 7a and 7b. Further, a pressing spring 5 is overlapped on the back surface of the rack 3 and fixed to the pickup 1 side with the holder 2 by a set screw 6 so that the rack 3 is pressed to the feed screw 4 side to facilitate the meshing.

The rack 3 is formed of a resin material having elasticity and slidability, and as a means for preventing the rack 3 from coming off, the flat projections 2d and 2e are formed on the upper surfaces of the two support portions 2a and 2b of the holder 2 and on the opposite sides. Protrusively toward. In this configuration, the rack 3 is integrally formed with the holder 2 so as to cover from the back side thereof, and large torsion of the rack 3 due to an impact such as dropping is suppressed by the protrusions 2d and 2e of the rack disengagement prevention means, thereby deforming and breaking. It is preventing. However, in these configurations, the number of parts used in the rack portion increases, and the number of assembly steps and the unit price of the product increase (see Patent Document 3).
JP-A-8-249838 (paragraphs 0012 to 0019, FIGS. 5, 6, and 7) Japanese Utility Model Publication No. 6-19168 (paragraphs 0011 to 0013, FIG. 3) Japanese Patent Laid-Open No. 9-7317 (paragraphs 0012 to 0016, FIGS. 1 and 2)

Also in the above-mentioned conventional configuration, it is composed of a metal feed screw that moves along a sliding shaft and a metal or resin when a reciprocating motion of a pickup table such as a moving table or tray of an electronic device or an audio or information device. There was a problem that abnormal noise was generated because the rack portion was rubbed.

  Further, when the table and tray were reciprocated, the hinge supporting the rack portion was always subjected to stress due to torsion, and there was concern about durability. Further, since the hinge supporting the rack portion is largely twisted due to tooth skipping due to impact, there is a problem that the rack is easily deformed and broken.

Further, since the production cost is high when an outsert molded part with a thin metal plate is used, there is a problem that the unit price of the part is high.

The present invention solves the above-mentioned conventional problems, reduces abnormal noise between the feed screw and the rack portion in contact with the feed screw, improves the durability of the hinge that supports the rack portion during reciprocating motion, and
An object of the present invention is to provide a feed mechanism device that minimizes twist caused by tooth jump due to impact, prevents deformation and destruction of a rack, and reduces the unit cost of parts.

  In order to solve the above-described conventional problems, the feed mechanism device of the present invention includes a feed screw that slides a table or a tray on a slide shaft by rotation, and the table or the tray is rotated by rotating the feed screw. In the feed mechanism device that moves the slide part on the slide shaft, a rack part formed of a protrusion inserted into a thread groove of the feed screw provided in a part mounted on the table or the tray, and the rack part A compression spring that presses against the thread groove of the feed screw, the rack portion is inserted into the thread groove of the feed screw, and the rack portion moves along the thread groove by rotation of the feed screw. The table and the tray are moved.

  Further, the rack part and the hinge supporting the rack part are integrally formed of a thermoplastic resin.

  Further, the rack portion and the hinge are formed of polyacetal resin.

  Furthermore, a rib for preventing twisting of the hinge is provided.

  Further, the ribs are a pair of ribs that are erected so as to face each other, and a portion provided with the pair of ribs forms a recess.

According to the feed mechanism device of the present invention, by using a rack that prevents twisting of the hinge due to movement of the table or tray, and a compression spring that is an elastic body that is pressure-bonded so that the rack portion is stabilized in the feed screw groove, The stress applied to the hinge can be reduced.
Further, by integrally molding the rack portion and the hinge supporting the rack portion with a resin material, it is possible to reduce noise between the feed screw and the rack portion that is pressure-bonded to the feed screw.
Furthermore, the number of parts used can be reduced, and the cost can be reduced compared to the metal sheet outsert product.

Furthermore, the rack rib shape is designed to cover the guide ribs that prevent the hinge from twisting the rack standing on the table or tray facing each other, so that the twisting of the hinge can be minimized. , Can reduce the destruction.

  Embodiments of a feed mechanism device according to the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration example of a feeding mechanism device according to an embodiment of the present invention. FIG. 2 is a rear plan view (a) and a side view (b) of the assembly drawing. FIG. 3 is a cross-sectional view of the rack portion.

1 and 2, the feed mechanism device feeds a rotationally driven drive motor 102, a stainless steel feed screw 103 press-fitted in the longitudinal direction of the drive motor shaft, and a table 109 formed of a polyacetal resin material. 2 as a guide to be moved along the screw 103
A stainless steel sliding shaft 104 and a stainless steel compression spring rack spring 111 are inserted into a table 109 and a spring boss 114 erected on the table 109.

  Next, a rack 107 formed of a polyacetal resin material so as to sandwich the rack spring 111 is placed on the table 109 and fastened and fixed with a rack mounting screw 106. A table unit 113 in which these components are incorporated. One slide shaft 104 is inserted into two shaft holes 115 provided in the table 109 of the table unit 113. Further, the remaining slide shaft 104 is inserted into the guide slit 116 provided in the table 109 to stabilize the installation of the table 109.

  Here, the rack 107 is pressed into the thread groove of the feed screw 103 by the rack spring 111 which is a compression spring. Further, one of the two sliding shafts 104 inserted into the table unit 113 is inserted into the shaft hole formed in the sheet metal chassis 101, and the other end of the sliding shaft 104 is also inserted into the shaft hole of the other chassis. insert. Further, in order to attach these slide shafts 104 to the chassis 101, four slide shaft holders 105 are installed at the ends of the respective slide shafts, and the four slide holders 117 are fastened to the chassis 101 side by holder mounting screws 117 so that the slide shafts are long. Fix it so that it does not move in the direction.

1 and 2, the rack 107 of the feed mechanism device of the present invention includes a feed screw 103.
A rack portion 118 made of a protrusion inserted into the screw groove and a rack hinge 112 that supports the rack portion 118 are integrally formed of a polyacetal resin material. Since the rack portion 118 of the polyacetal resin of the rack 107 is in contact with the stainless steel feed screw 103 and is integrally molded, when the table 109 is moved, the rack portion 118 is subjected to vibration due to the twist of the hinge of the rack 107. It becomes difficult to occur and noise can be reduced. In addition, since it is possible to reduce the manufacturing cost and the number of used parts by making it as an integrally molded part, the unit cost can be reduced.

  1 and 2, the table 109 is provided with a torsion prevention guide rib 108, and the rack 107 is provided with a rack guide rib 110 having a cross-sectional shape that covers the torsion prevention guide rib 108 of the table 109. The prevention guide rib 108 is incorporated so as to be wrapped. By adopting these built-in configurations, it is possible to minimize the torsion of the rack hinge 112, which is an integral molded part, with the rack 107 caused by tooth skipping due to impact, and to prevent deformation and breakage of the rack.

The shape of the rack guide rib 110 standing on the rack 107 is not limited to the U-shape, and any shape that wraps the torsion prevention guide rib 108 standing on the table 109 may be used. Conversely, the torsion prevention guide ribs 10 of the table 109 also depend on the shape of the rack guide ribs 110 erected on the rack 107.
The shape may be such that 8 is wrapped. FIG. 3 is a cross-sectional view of the rack 107 taken along the line AA.

  Further, in FIGS. 1 and 2, the rack guide ribs 110 that are erected on the rack 107 are most effective in minimizing torsion when they are erected in the vicinity of the rack hinge 112.

  Further, in this embodiment, a boss for positioning the rack 107 is erected on the table 109 in place of the torsion preventing guide rib 108, and a rack 107 that is opposed to the rack 107 is formed with a positioning hole in the rack 107. It is also possible to prevent the rack hinge 112 of the integrally molded part from being twisted to the minimum and prevent the rack from being deformed or broken. Conversely, a positioning boss may be provided on the rack 107 and a positioning hole may be formed in the table 109 to prevent the rack from being deformed or broken.

  Furthermore, by forming the rack hinge 112 of the present embodiment as a thin metal plate and outsert molding with the rack 107, the hinge portion has a stronger structure and the durability against breakage can be improved. If the cost reduction is not given priority, it is more preferable that the rack hinge is outsert-molded.

  The feed mechanism device according to the present invention is useful as a mechanism for reducing deformation and breakage of a rack hinge for supporting a rack portion of a moving table of an electronic device, a tray rack portion, or an optical pickup using a feed screw, It is particularly suitable for use with resin-integrated racks and racks formed by outsert.

Configuration diagram of feed mechanism device in embodiment of the present invention-upside down diagram Assembly drawing-back plan view of feed mechanism device in embodiment of the present invention Assembly drawing-side view of feeding mechanism device according to embodiment of present invention Sectional view on the AA line of the rack part of the feed mechanism apparatus in the embodiment of the present invention. Top view of conventional feeding mechanism device 1 Side view of conventional feeding mechanism device 1 Bird's-eye view of conventional feeding mechanism device 2 Assembly view of conventional feed mechanism device 3-side view Assembly drawing-front view of conventional feeding mechanism device 3

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pickup 2 Holder 2a Support part 2b Support part 2d Detach prevention shape 2e Detach prevention shape 3 Rack 4 Feed screw 5 Pressing spring 6 Set screw 7a Stopper 7b Stopper 8 Feed screw 10 Lead screw holder 11 Gear 12 Spring plate 13 Rack part 17 Pickup 22 Convex portion 23 Spring 23a Spring tip 24 Weld mark 25 Fixing screw 101 Chassis 102 Motor 103 Feed screw 104 Sliding shaft 105 Sliding shaft holder 106 Rack mounting screw 107 Rack 108 Torsion prevention guide rib 109 Table 110 Rack guide rib 111 Rack spring 112 Rack hinge 113 Table unit 114 Spring boss 115 Shaft hole 116 Guide slit 117 Holder mounting screw 118 Rack portion 401 Feed screw 402 Rack 403 Rack hinge spring 404 Rack holding spring 405 Pickup 406 Slide shaft

Claims (5)

A feed mechanism device that includes a feed screw that slides a table or a tray on a slide shaft by rotation, and that moves the table or the tray on the slide shaft by rotating the feed screw. A rack portion provided on a component to be mounted on the tray, the rack portion including a protrusion inserted into a thread groove of the feed screw, and a compression spring that presses the rack portion against the thread groove of the feed screw; Is inserted into the thread groove of the feed screw, and the rack part moves along the thread groove by the rotation of the feed screw, thereby moving the table and the tray. The feed mechanism device according to claim 1, wherein the rack portion and the hinge supporting the rack portion are integrally formed of a thermoplastic resin. The feed mechanism device according to claim 2, wherein the rack portion and the hinge are made of polyacetal resin. The feed mechanism device according to claim 2, further comprising a rib that prevents twisting of the hinge. The feed mechanism device according to claim 4, wherein the ribs are a pair of ribs that are erected opposite to each other, and a portion provided with the pair of ribs forms a recess.

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