JPH0720455U - Rack equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a backlash-free rack having a small thickness and a reduced number of parts. [Structure] In the upper and lower plate racks, an upper plate rack 40 is formed of a thin plate, and a center thereof is punched to form a bent plate spring 41,
This leaf spring 41 is attached to the through hole 5 in the center of the plate-like lower plate rack 50.
1, and in this state, the tip 43 of the leaf spring 41 is brought into contact with the front wall 51a of the through hole 51, and the upper plate rack 40 is attached to the lower plate 5
It has a structure in which 0 is elastically urged in the longitudinal direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a backlash-free rack device used for a disc player such as a CD player and an MD player.

[0002]

[Prior art]

 Conventionally, a backlash-free rack used for a disc player is, as shown in FIG. 4, a plate-shaped upper plate rack 10 and a lower plate rack 20 having two upper and lower plates, which are stacked together. The coil spring 30 is elastically biased and disposed in the central through hole 31. Since the coil spring 30 is arranged between the flange 11 of the upper plate rack 10 and the flange 21 of the lower plate rack 20, the coil spring 30 is moved from the assembled state shown in FIG. 4B to the upper plate rack. When the lower plate rack 10 and the lower plate rack 20 are displaced from each other, they are in the use state as shown in (a) and (c), the coil spring 30 is compressed, and the teeth 12 and the lower plate rack of the upper plate rack which are elastically urged. A pinion tooth (not shown) is sandwiched between the tooth 22 and the other tooth 22 without backlash.

[0003]

[Problems to be solved by the device]

 However, since the conventional racks without backlash are formed by two racks of the same thickness at the top and bottom because it is necessary to accommodate the coil springs, the thickness of the two racks is large, especially the dimension in the thickness direction is reduced. There was a problem with portable CD players, MD players, etc.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a rack device having a simple structure, a small thickness, and no backlash.

[0005]

[Means for Solving the Problems]

 The present invention is formed of a thin plate, a rack is formed on one side in the longitudinal direction, a plate spring is punched in the longitudinal direction in the approximate center, and a retaining hole is formed in the front and rear of the longitudinal plate. A rack, a plate-shaped rack on one side in the longitudinal direction, a through hole into which the plate bar is inserted from above from approximately the center, and engages with the retaining hole at the front and rear in the longitudinal direction. And a lower plate rack formed with a retaining piece formed on the lower plate rack, the leaf spring is bent, and the bent tip contacts the front wall of the through hole, and the upper plate rack is attached to the lower plate rack. It is characterized in that it is elastically urged in the longitudinal direction.

[0006]

[Action]

 When the upper plate rack and the lower plate rack are misaligned, the bent tip of the leaf spring is pushed by the front wall of the through hole, so the fixed end of the leaf spring bends and the resilient force urges elastically. Then, the teeth of the upper plate rack and the teeth of the lower plate rack sandwich the pinion teeth without a gap.

[0007]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1A is a perspective view of a rack showing an embodiment of the present invention, FIG. 1B is a sectional view of the rack when assembled, FIG. 1C is a sectional view of the rack in use, and FIG. FIG. 3 is a partial plan view showing a usage state attached to the. In the figure, 40 is an upper plate rack, which is formed of a thin plate. A rack having the same shape as the lower plate rack 50 is formed on one side in the longitudinal direction, and a plate spring 41 punched in the longitudinal direction from the upper plate rack 40 is bent at the approximate center, and is bent forward and backward in the longitudinal direction. The retaining long hole 42 is punched out in a T-shape.

A lower plate rack 50 has a rack formed on one side in the plate-like longitudinal direction, and a through hole 51 into which the plate spring 41 is inserted from above is formed at an approximate center. Reference numeral 52 is a retaining piece, which is erected on the upper surface of the lower plate rack 50, is inserted into the retaining hole 42 from below, and is engaged with the upper plate rack 40 so as not to be removed in a state shifted in the longitudinal direction. There is.

The leaf spring 41 is bent in two steps, and the bent tip 43 is in contact with the front wall 51 a of the through hole 51. Then, in the use state shown in FIG. 1C, the restoring force of the leaf spring 41 acts in the direction of arrow R, and as a result, the upper plate rack 40 is elastically biased in the direction of arrow B, and the enlarged view of FIG. As shown in FIG. 5, the teeth 54 of the lower plate rack 50 and the teeth 44 of the upper plate rack sandwich the teeth of the pinion 74a without a gap.

FIG. 2 shows an example in which the present invention is applied to a pickup moving part of a CD player. In FIG. 2, 71 is a pickup, 72 is a turntable, and a worm wheel 74 meshed with a worm gear 73a of a motor 73 is provided. When rotated, the coaxial pinion 74a meshes with the rack 53 of the present invention without backlash and moves the rack 53 in the direction of the arrow as shown in the enlarged view A so that the rod 75 and the guide plate 76 are gently moved. The pickup 71 is moved in the direction of the arrow. Of course, when the motor 73 rotates in the reverse direction, the rack 53 and the pickup 71 move in the direction opposite to the arrow.

Although the leaf spring 41 is bent in two steps, the number of bending points may be one or three or more. However, the purpose of thinning the rack plate can be most reasonably achieved when bending it in two steps. That is, FIG. 3A shows an example of a leaf spring having one stage, and FIG. 3B shows an example of a leaf spring having two stages. Since the inclination angle of the tip of the leaf spring that abuts the front wall 51a of the through hole is approximately 45 degrees in order to efficiently transmit the restoring force of the leaf spring to the rack plate, this inclination of 45 degrees is desirable. The bending angle of the root of the leaf spring for giving to the tip is increased from 1 step to 2 steps, and becomes larger when the rack plate thickness is the same (α1 <α2). A large root bending angle means that a large restoring force of the leaf spring can be obtained, and accordingly, a large force for shifting the upper and lower racks 40 and 50 can be obtained. On the contrary, in order to obtain the same leaf spring restoring force, the lower plate rack 50 needs to be thicker in the one-stage leaf spring than in the two-stage leaf spring. Note that FIG. 3C is an example of a leaf spring in which bending portions are provided in three steps, but in this case, if the rack thickness is the same, a large bending angle at the base of the leaf spring cannot be obtained, and the same bending angle is not obtained. When trying to obtain the leaf spring restoring force, the rack plate thickness increases.

[0012]

[Effect of device]

 The present invention described in detail above has the following effects. (1) Since the thickness of the rack becomes thin, the thickness of the CD player, MD player, etc. can be designed thin by using this, which is particularly advantageous for portable design.

(2) Since the coil spring is not required and the alternative leaf spring can be integrally formed with the upper plate rack by sheet metal or the like, the number of parts can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view and a sectional view showing an embodiment of the present invention.

FIG. 2 is a partial plan view of a CD player using the rack of the present invention.

FIG. 3 is another embodiment of the leaf spring of the present invention.

FIG. 4 is a perspective view and a sectional view of a conventional rack device.

[Explanation of symbols]

 40 Upper Plate Rack 41 Leaf Spring 42 Detachment Hole 43 Tip 44, 54 Teeth 50 Lower Plate Rack 51 Through Hole 51a Front Wall 52 Locking Piece 53 Rack

Claims (1)

[Scope of utility model registration request] 1. A rack, which is formed of a thin plate, has a rack formed on one side in the longitudinal direction, a plate spring punched in the longitudinal direction at substantially the center, and retaining holes formed in the front and rear of the longitudinal direction. A plate rack and a plate-shaped rack on one side in the longitudinal direction, a through hole into which the plate spring is inserted from above from approximately the center, and engages with the retaining holes at the front and rear in the longitudinal direction. And a lower plate rack on which a retaining piece is formed,
A rack device, wherein the leaf spring is bent, and the bent tip is in contact with a front wall of the through hole to elastically urge the upper rack in a longitudinal direction with respect to the lower rack.