JPS6334361A - Screw feed device - Google Patents

Abstract

PURPOSE:To prevent a thread groove of an internal thread body and a thread ridge of an external thread rod both from being bitten into wedgelike form, by making a contact part of the internal thread body come into contact with a support part of the external thread rod. CONSTITUTION:A thread ridge 15a of an external thread rod 15 is formed into trapezoidal form and a flat support part 15b is installed in a top face of the thread ridge 15a. And, a thread groove 26a of an internal thread body 26 is formed into trapezoidal form as well, and a flat contact part 26b is installed in a bottom part of the thread groove 26a. In addition, the contact part 26b at an inner circumferential upper side of the internal thread body 26 is brought into contact with the support part 15b at an outer circumferential upper side of the external thread rod 15. With this constitution, the internal thread body 26 and the external thread rod 15 both are prevented from being bitten thereinto.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention] (Industrial Field of Application) The present invention relates to a screw feeding device that uses a screw mechanism to horizontally transfer a product to be transported.

(Prior Art) In a magnetic or optical disk-shaped signal recording medium (hereinafter referred to as a disk), a head that moves in the radial direction of the disk reads signals from a rotating disk, and A screw feeder is used to move the head.

As shown in Fig. 4, this screw feeding device is constructed by attaching a female threaded rest 2 to a moving frame 1 supporting a head, screwing a male threaded rod 3 through the female threaded rest 2, and driving the male threaded rod 3 with a motor. The movable frame 1 is slidably supported on a guide rod 4 parallel to the male threaded rod 3 via a metal bearing 5, so that it can move while maintaining its posture.

(Problem to be Solved by the Invention) Incidentally, the above-mentioned disk is often loaded horizontally, but in this case, the male threaded rod 3 is supported horizontally, so as shown in FIG. 1 load i p
The til threaded body 2 acts radially on the male threaded rod 3, and the thread groove 2a on the upper side of the inner circumference of the female threaded body 2 and the thread 3a on the upper side of the outer circumference of the male threaded rod 3 bite into a wedge shape. The load on

Therefore, conventionally, a metal bearing 6 is added between the male threaded rod 3 and the moving frame 1, and this metal bearing 6 allows the screw fi2
This prevents biting of the screw thread 3a and the screw thread 3a.

The present invention attempts to prevent the thread from being fully threaded and the thread from digging into the thread without adding a metal bearing or the like between the male threaded rod and the transferred anti-dye material.

[Structure of the invention]

(Means for Solving the Problems) The present invention has a female threaded body 26 attached to the transferred counter-dyed material 25, a male threaded rod 15 supported horizontally through the female threaded body 26, and a male threaded rod 15 that is rotated. This relates to a screw feeding device for horizontally transporting the transferred counter-dye material 25 along the male threaded rod 15 via the female threaded body 26, and the screw thread 15a of the male threaded rod 15 is formed into a trapezoidal shape.
A flat support portion 15b is provided on the top of the male screw body 2.
6 is formed into a trapezoidal shape, and a flat abutment part 26b is provided at the bottom of the screw groove 26a, and a support part 15b on the upper outer periphery of the male threaded rod 15 is attached to the upper inner periphery of the male threaded body 26. The contact portion 26b is brought into contact with the contact portion 26b of the contact portion 26b.

(Function) The screw feeding device of the present invention has a contact portion 26 on the upper side of the inner circumference of the female screw body 26 on the support portion 15b on the upper side of the outer circumference of the male screw driver 15.
b is in contact with each other to prevent the screw groove 26a of the female screw rest 26 and the screw thread 15a of the male screw rod 15 from biting into each other.

(Embodiment) An embodiment of the head driving device of the present invention will be described with reference to the drawings.

In FIG. 3, reference numeral 11 denotes a horizontal board, and a DC motor 12 for high-speed access and a stepping motor 13 for low-speed servo are provided on one and the other side of this board 11, facing each other via a mounting base 14, respectively. One end and the other end of a male threaded rod 15 are connected to the output shafts of one and the other motors 12, 12 located coaxially, via a cover 16 and a pin 17, respectively.

Both ends of the guide rod 21 are supported on the substrate 11 via a desk support stand 22 and a presser piece 23, and are provided in one line with the male screw rod 15.

Reference numeral 25 denotes a moving frame as a counter-dye material to be transferred, and a female screw body 26 is provided on one side of the moving frame 25.

A pair of metal bearings 27 are provided on the other side of each of the metal bearings, the male threaded rod 16 passes through the female screw rest 26, and the guide rod 21 slides through the pair of metal bearings 27.

Further, the moving frame 25 incorporates an optical head mechanism 28, and a slit 29 corresponding to the head mechanism 28 is formed in the substrate 11 in parallel with the male threaded rod 15 and the guide rod 21. Correspondingly, a disk (not shown) rotates along the lower surface of the substrate 11, and by projecting a laser beam from the head mechanism 28 through the slit 29 to the rotating disk, a signal of the disk is detected. It is designed to read.

At this time, when searching for disk signals or fast-forwarding the head mechanism 28, the DC motor 12 for high-speed access is driven, and when reading disk signals, etc. When the low-speed servo stepping motor 13 is driven and the male threaded rod 15 is rotated in either the forward or reverse direction, the male threaded rod 15 and the female screw rest 26 are engaged, and the moving frame 25 is attached to the male threaded rod 15 and the guide rod 21. This causes the head mechanism 28 to move along the slit 29 in the radial direction of the disk, thereby retrieving the signal of the disk or the head.
It is possible to perform high-speed access operations such as forwarding of the mechanism 28 and low-speed servo operations such as reading the original of the disk.

Although detailed explanation will be omitted, this practical example is applied to a disc player that plays back a flexible light-transmitting film disc, and the illustrated head mechanism 28 is on the light emitting side, and the light receiving side is on the light receiving side. , is located under a disk (not shown) on the lower surface of the substrate 11, and is attached to a moving frame 25 so that it can move integrally with the moving frame 25 facing the light projecting side.

Next, the relationship between the male threaded rod 15 and the female threaded body 26 will be specifically explained.

As shown in FIG. 1, the thread 15a of the male threaded rod 15 is formed into a trapezoidal shape, and a flat support portion 15b is provided at the top of the thread 15a, and the thread groove 2 of the female thread rest 26 is provided.
6a is formed into a trapezoidal shape, and a flat contact portion 26b is provided at the bottom of the thread groove 26a. The width of the thread 15a of the male screw rod 15 is set to be higher than the width of the thread groove 26a of the female screw rest 26.

Therefore, even if the load P of the moving frame 25 acts radially on the male threaded rod 15 from the female threaded body 26/lS, the male threaded rod 1
The abutment part 26b on the upper inner circumference of the female threaded body 2G is in contact with the support part 15b on the upper outer circumference of the threaded body 2G, and in this state, as shown in FIG. A predetermined gap CS of, for example, about 10a is maintained between the sides, and the thread 268 of the female threaded body 2G and the thread 15 of the male threaded rod 15 are maintained.
a does not bite into a wedge shape, and the motor 12.13
The load on the system will not increase.

Note that this embodiment is an example in which the application is applied to a flexible disc (a disc brake that plays back a light-transmissive film disc), but the application is not limited to this, and is applicable to hard-type light-reflective discs such as Viao discs. The present invention can also be applied to a disc brake V or the like that plays compact discs.

〔Effect of the invention〕

Up)! As described above, according to the screw feed Wffl of the present invention, even if a load acts radially from the female threaded body to the male threaded rod, the inner part of the female threaded body is Since the abutting part on the upper side of the circumference does not touch, the threads of the female threaded body and the male thread do not bite into a wedge shape.
The load on the motor is not large, so there is no need to use an expensive large-sized rotor, and power consumption can be reduced. Furthermore, since there is no need to add separate parts such as metal bearings between the male threaded rod and the transferred counter-dye material, the cost can be reduced.

[Brief explanation of drawings]

1 to 3 show an embodiment of the screw feeding device of the present invention, in which FIG. 1 is a vertical cross-sectional view of the main part, FIG. 2 is an enlarged view thereof, and FIG. 3 is a perspective view of the whole. , FIG. 4 is a plan view of a conventional screw feeding device, and FIG. 5 is a sectional view of a part thereof. 15...Male screw rod, 15a...Screw thread, 15b...
Support part, 25... Moving frame as a transfer counter-dye object, 26...
Female threaded body, 26a... Thread groove, 26b... Contact portion.

Claims (1)

[Claims] (1) Attach a female threaded body to the object to be transferred, screw a male threaded rod supported horizontally through this female threaded body, and rotate the male threaded rod to move the object to be transferred horizontally along the male threaded rod via the female threaded body. A screw feeding device for transferring a screw to a screw, wherein the thread of the male threaded rod is formed into a trapezoidal shape, a flat supporting portion is provided at the top of the thread, and the thread of the female threaded body is formed into a trapezoidal shape to feed the screw. A screw feeding device characterized in that a flat abutting part is provided at the bottom of the groove, and the abutting part on the upper inner periphery of the female screw body is brought into contact with the support part on the upper outer periphery of the male threaded rod.