JPH09100052A - Sprocket wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape conveying sprocket wheel that prevents what is called a mid-folding phenomenon from occurring, in particular causing no product failure at all. SOLUTION: A spring 5 is built in a sprocket wheel 10 conveying a film carrier tape as a wheel pin 1 and this sprocket wheel of a tape are engaged with each other, and in this constitution, the sprocket wheel 10 is so constituted as to make an interspace (d) in the cross direction of the film carrier tape of a sprocket pin 1 become variable by elastic force of the spring 5. According to the constitution like this, if the interspace (d) in the tape cross direction of the sprocket pin 1 grows larger, tape tension is added to the cross direction, thereby preventing any mid-folding motion is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a TAB (Tape).
The present invention relates to a sprocket wheel for transporting a film carrier tape (hereinafter, simply referred to as a tape) used in Automated Bonding technology, and particularly,
The present invention relates to a sprocket wheel that can apply tension in the tape width direction.

[0002]

2. Description of the Related Art A conventional sprocket wheel used for transporting tape in TAB technology is shown in FIGS.
4 will be described.

FIG. 2 is a schematic view showing a tape transport system of a bonder in general TAB technology, FIG. 3 is a front view of a conventional sprocket wheel used in the tape transport system bonder of FIG. 2, and FIG. It is a side view of the conventional sprocket wheel used for the tape transport type bonder.
In FIG. 2, 11 is a conventional sprocket wheel, 1
2 is a reel and 13 is a tape.

As shown in FIG. 2, the tape 13 is a reel 1
Although the tape 13 is fed from the No. 2, the sprocket wheel 11 is generally used to feed and position the tape 13.

In FIGS. 3 and 4, 1 is a sprocket pin, 3 is a rotating shaft, and d is an interval between the sprocket pins 1 in the width direction of the tape 13. Conventional d is constant depending on the type of sprocket wheel.

As shown in FIGS. 3 and 4, the sprocket wheel 11 has a circular drum shape, a pulse motor (not shown) is directly connected to the rotating shaft 3, and the flange portions at both ends thereof are provided over the entire circumference. The sprocket pins 1 are provided at predetermined intervals in accordance with the intervals between the sprocket holes of the tape 13.

In the feeding of the tape 13 shown in FIG. 2, the sprocket pin 1 is carried while being engaged with a plurality of sprocket holes (not shown) of the tape 13.

[0008]

Conventionally, there are three types of tape width in the tape. If this tape width is wide, for example 70 mm, it will be
A so-called center folding phenomenon occurs in which the central portion of the tape is recessed and bent in the longitudinal direction.

This center bending phenomenon is caused by various factors, such as the size of the sprocket holes, the accuracy of the spacing, the shape and accuracy of the sprocket wheels, the difference in thermal expansion between the tape and the sprocket wheels, and the difference in reinforcement due to the copper foil pattern. It is said that.

There is a problem that this center-folding phenomenon is not only inconvenient for carrying the tape but also causes a defective product.

The present invention has been made to solve the above-mentioned problems of the prior art, prevents the center-folding phenomenon of the film carrier tape, and is convenient for carrying the tape.
It is an object of the present invention to provide a sprocket wheel for transporting a film carrier tape that does not cause product defects.

[0012]

With the above object, it is noted that the center folding phenomenon of a film carrier tape occurs due to various factors, but it can be prevented by applying a large tension in the width direction of the tape at the time of feeding the tape. A sprocket wheel for transporting a film carrier tape, wherein a sprocket pin is engaged with a sprocket hole of the tape, and a sprocket wheel for transporting a film carrier tape for transporting a film carrier tape, wherein a width direction interval of the sprocket pin between the tapes Can be achieved by making the variable.

In the sprocket wheel for transporting the film carrier tape described in the preceding paragraph, an elastic member is built in, and the interval of the sprocket pin in the width direction of the tape is variable by the elastic force of the elastic member. Achieved by

The functions of the above technical means are as follows.

According to the structure of the present invention, when the sprocket pin is engaged with the sprocket hole, the elastic force of the elastic member built into the sprocket wheel increases the gap between the sprocket pins in the tape width direction, and the sprocket is Tension can be applied to the tape in the width direction thereof through the pin and the sprocket hole to prevent the phenomenon of center folding.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A sprocket wheel for transporting a tape (hereinafter referred to as a sprocket wheel) according to an embodiment of the present invention will be described below with reference to FIG.

[Embodiment 1] FIG. 1 is a schematic sectional view of a sprocket wheel according to an embodiment of the present invention. In FIG. 1, 1 is a sprocket pin, 2 is a wheel body, 3
a, 3b, 3c are shaft holes, 4a is a fixed plate, 4b is a movable plate,
5 is a spring, 6 is a bearing, 7 is a stopper ring, 8a, 8
a ', 8b and 8b' are fixing screws, 9 and 9'are stopper pins, and 10 is a sprocket wheel according to this embodiment.

A large number of the fixing screws and the stopper pins are concentrically arranged, but the fixing screws 8a, 8a ', 8b, 8b' and the stopper pins 9, 9'shown in the sectional view.
Will be described.

As shown in FIG. 1, the sprocket wheel 1
Reference numeral 0 denotes a wheel body 2 and two disk-shaped side plates 4a and 4b arranged on both sides of the wheel body 2, respectively.
The sprocket pins 1 are provided at predetermined intervals on the circumference of the end faces of a and 4b to form a drum shape as a whole. The side surfaces of the side plates 4a and 4b that contact the wheel body 2 are referred to as inner side surfaces, and the opposite side is referred to as an outer side surface.

The wheel body 2 is composed of two large-diameter and small-diameter rings, and the two large and small rings are concentrically arranged inside and outside at a constant interval. A shaft hole 3a is provided in the center of the inner ring, and a bearing 6 and a stop ring 7 are provided in the shaft hole 3a.

The space defined by the space between the two rings serves as a storage location for the spring 5. Further, on both outer side surfaces of the outer ring of the wheel body 2, that is, on the side in contact with the inner side surface of the side plate 4a, a mounting screw portion and a side plate 4b are provided.
A mounting convex hole is provided on the side in contact with the inner side surface.

Of the two side plates, the fixed plate 4a, which is one side plate, has a shaft hole 3b formed at the center thereof, and the shaft hole 3b is provided with a bearing 6 and a stop ring 7. .
The fixing plate 4a has a concentric ring inside the wheel body 2 and an outer concentric ring by fixing screws 8a, 8a ', 8b, 8b' which are concentrically arranged in two rows inside and outside in the radial direction. The shaft holes 3b and 3a are respectively fixed to the ring-shaped rings, and form a coaxial continuous shaft hole.

With the above structure, the fixed plate 4a and the two concentric rings have an integrated structure.

As described above, the spring 5 is accommodated in the spring accommodating portion between the two concentric rings. The length of the spring 5 has a sprocket wheel, a sprocket hole, and a tape so as to have a necessary minimum elastic force. It is determined by the shape and material of the material.

The movable plate 4b, which is the other one of the two side plates, has a shaft hole 3c in the center thereof and a mounting hole in the outer peripheral portion thereof. Through the mounting holes, the movable plate 4b is mounted on the wheel body 2 by stopper pins 9 and 9'concentrically arranged.

Each of the stopper pins 9 and 9'has a so-called I-shaped shape in which the central portion thereof has a rod shape with a circular cross section, and both ends are provided with edges projecting in a rectangular shape in the radial direction of the circular cross section. There is. One of the edges is larger than the other edge. Increasing the size of the other edge is not always necessary, but facilitates the assembly operation described later. Hereinafter, one large edge is referred to as a distal end, and the other large edge is referred to as a tip.

Although not shown, the mounting hole has a shape as seen from the axial direction of the hole, and the I-shaped stopper pin 9,
It is configured so that the respective tip portions of 9'and the circular rod portion at the center thereof can pass through. And the movable plate 4
When b reaches a predetermined position, the shaft hole 3c and the shaft holes 3a and 3b form a coaxial continuous shaft hole.

A pulse motor (not shown) is directly connected to the continuous shaft holes 3a, 3b and 3c thus constructed to feed the tape 13, but since it is the same as the prior art, a detailed description will be given. Is omitted.

The entrance of the mounting convex hole of the wheel body 2 is not shown, but the shape viewed from the axial direction of the hole has a circular shape at the tip and the center of each of the I-shaped stopper pins 9 and 9 '. It is configured so that the rod-shaped portion can pass through.

The bases of the mounting convex holes are perforated and enlarged so that they can be housed even if the tips of the I-shaped stopper pins 9 and 9'are rotated.

The operation of attaching and assembling the movable plate 4b to the wheel body 2 will be described with reference to the I-type stopper pin 9.

First, the spring 5 having a predetermined length is housed in the spring housing portion between the two concentric rings. This stored spring 5
Thereby, an elastic force is generated in the length direction.

Next, the tip of the I-shaped stopper pin 9 is inserted into the mounting hole in the outer peripheral portion of the movable plate 4b and passed therethrough.
At this stage, the spring 5 and the inner surface of the movable plate 4b have not yet come into contact with each other.

Next, the tip of the I-shaped stopper pin 9 that has passed through the mounting hole is inserted from the entrance of the mounting convex hole, and the spring 5 and the movable member 5 are moved against the elastic force of the spring 5. With the inner surface of the plate 4b abutting, the bottom surface of the convex hole is reached and stored. That is, the side surface of the wheel body 2 is in contact with the inner side surface of the movable plate 4b, and the end portion of the I-shaped stopper pin 9 is in contact with the outer surface of the movable plate 4b.

At this time, since the end portion of the I-shaped stopper pin 9 is larger than the mounting hole, it cannot be accidentally passed through. After that, the I-type stopper pin 9 is rotated by a predetermined angle.

Due to this rotation, even if one end of the spring 5 and the inner side surface of the movable plate 4b come into contact with each other and the elastic force of the spring 5 is received, the end portion of the I-shaped stopper pin 9 has the end of the movable plate 4b. Due to the mounting holes, the tip of the I-type stopper pin 9 is constrained by the base of the mounting convex hole of the wheel body 2 so that it will not come out of any of the mounting holes.

The length of the I-shaped stopper pin 9 is set to be slightly longer than the sum of the thickness of the movable plate 4b and the total depth of the mounting convex hole, and the stopper pin at the base of the convex hole. The depth of the tape 9 in the insertion direction is the same as that of the tape 13
To be the same as the moving distance d of the sprocket pin in the width direction.

In this way, the other stopper pin 9 '
Also, the movable plate 4b is attached to the wheel body 2, the side surfaces thereof are in contact with each other, and the elastic force of the spring 5 applies tension to the movable plate 4b in the direction d of the sprocket pin 1. As a result, the depth of the convex hole base is maximized and the distance between the wheel pins 1 in the width direction increases.

Now, if the wheel pin 1 and the sprocket hole of the tape 13 are meshed with each other, tension is applied in the width direction of the tape 13 to prevent center bending.

In the above embodiment, the width of the wheel pin is changed by the spring in the width direction, but the present invention is not limited to this, and includes the scope of other means of the same technical idea. It is a thing.

Further, the I-shaped stopper pin 9 and the movable plate 4
The combination structure of the mounting hole of b and the mounting convex hole of the wheel body 2 is not limited to the above-described embodiment, and many modified examples are conceivable, but the scope of other means of the same technical idea is not limited. Includes.

[0042]

As described in detail above, according to the present invention, the sprocket wheel for transporting the film carrier tape, which prevents the center folding phenomenon of the film carrier tape, is convenient for transporting the tape, and does not cause product defects. Can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a sprocket wheel according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a tape transport system of a bonder in a general TAB technique.

3 is a front view of a conventional sprocket wheel used in the tape transport type bonder of FIG.

FIG. 4 is a side view of a conventional sprocket wheel used in the tape transport type bonder of FIG.

[Explanation of symbols]

 1 Sprocket Pin 2 Wheel Body 3a, 3b, 3c Shaft Hole 4a Fixed Plate 4b Movable Plate 5 Spring 6 Bearing 7 Stop Ring 8a, 8a ', 8b, 8b' Fixing Screw 9, 9'Stopper Pin 10 Sprocket Wheel of this Embodiment 11 Conventional sprocket wheel 12 reel 13 tape

Claims (2)

[Claims] 1. A sprocket wheel for transporting a film carrier tape, wherein a sprocket pin engages with a sprocket hole of a film carrier tape to transport the film carrier tape, wherein a space between the sprocket pins in a width direction of the film carrier tape is variable. A sprocket wheel for transporting a film carrier tape, characterized by being configured as follows. 2. The sprocket wheel according to claim 1, wherein an elastic member is built-in, and the elastic force of the elastic member makes it possible to change the distance between the sprocket pins in the width direction of the film carrier tape. A sprocket wheel for transporting a film carrier tape.