JPH05221587A - Uniform winding reel for element carrier tape - Google Patents

Abstract

PURPOSE: To fall a warp of a carrier tape within a range of an industrial specification by satisfying a relationship of the specific formula for a width of the tape having a minimum diameter of a peripheral surface of a hub in a combination of the tape equivalently wound on a reel made of a hub and the hub having flanges at both ends. CONSTITUTION: A carrier tape 10 is spirally wound in an equivalently wound in a laminar state on a periphery of a peripheral surface 18 of a hut 15, disposed edge-to-edge to alter a position in an axial direction by a width of the tape 10, opposed edges of enclosing of the tape 10 of next layer are taken at an angle of an opposite direction regarding a shaft 16 of the hub 15. Here, the peripheral surface of the hub 15 has a minimum diameter D decided by the formula I, wherein W is a width mm of the tape 10. Here, the width of the tape 10 is set to 8 mm, a diameter of the hub 15 is 355.6 mm, or the width of the tape 10 is 12 mm, and a diameter of the hub 15 is 355.6 mm.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a reel of element carrier tape (so-called surface-mounted supply carrier tape) of a tape which is sent from the carrier tape manufacturer to the element manufacturer, wherein Means the person who unwinds the tape from the reel and fills it with elements.

[0002]

BACKGROUND OF THE INVENTION Surface-mounted supply carrier tapes or element carrier tapes allow elements (eg, electrical elements such as resistors, capacitors or integrated circuits) to be manufactured by the element manufacturer and by different manufacturers to assemble the element into a new product. , Typically used to transport elements to a manufacturer who assembles them by an automated assembler that continuously removes the elements from the carrier tape and assembles them into a new product.

Such carrier tapes are polymer strips formed with wall portions that define a series of identical pockets along the length thereof at evenly spaced intervals, the pockets containing identical elements. Are shaped to closely receive (ie, the pockets can have, for example, a rectangular or generally "I" or "T" shape in the plane of the strip, and a flat or round bottom to match the shape of the element. The strip may also be used to receive a drive sprocket for driving the strip and to accurately position the pocket along the tape with respect to the assembly machine. It has a through hole to provide a possible indicator hole.

[0004] Typically, the carrier tape is manufactured in a first manufacturing location, wound on reels, and shipped to the provider of the element intended for shipping. The element provider unwinds the carrier tape from the reel, fills the pocket along the carrier tape with the element, adheres the removable cover strip along the carrier tape over the element-filled pocket, and the element fills. The carrier tape, which has been covered with a cover strip, is typically wound onto a smaller reel and sent to a user who feeds it from the reel to an assembly machine which removes the elements.

According to industry standards, non-cumulative camber should be less than 1 mm over a length of 250 mm. What this means is that when the carrier tape is shipped to the supplier of the element, unwound from the reel and dispensed on a flat surface, its long edge is 250 mm of any of the carrier tape.
The length shall not exceed 1 mm.

Element tapes can be easily made to meet this need. If the element tape is wound on a reel so that all hug edges are on a single plane above itself for shipping to the element's supplier (which is referred to in the industry as "planetary winding"), this is generally Is as straight as when it was manufactured.

However, such planet wound reels are limited in the amount of elemental tape they carry. An element tape 8 mm wide shipped to the element supplier more than a year before the filing date of the present application has a width between opposing flanges on the reel that is substantially greater than the width of the carrier tape (ie 76.2 mm or 3 mm). Inch) and 203.2 mm (8 inch) outer diameter cores were wound evenly edge-to-edge [ie, the element carrier tape
A 203.2 mm (8 inch) diameter peripheral surface is spirally wound into multiple layers evenly on the hub and the carrier tape hugs in each layer are arranged edge-to-edge, these huggings being axially the width of the carrier tape. The positions are changed and the opposite edges of the carrier tape wraps in the next layer are angled in the opposite direction with respect to the axis of the hub].

However, it has been found that the carrier tapes supplied in this way do not always meet the warpage specifications mentioned above (even if the initially manufactured carrier tapes meet these specifications). And therefore such even winding did not achieve commercial success.

[0009]

SUMMARY OF THE INVENTION The present invention provides a planetary reel of carrier tape that consistently meets the warpage specifications provided that the carrier tape as manufactured meets the warpage specifications.

According to what the inventor has recognized,
8mm wide element tape shipped to the element's supplier, edge-to-edge evenly wound on a reel having a 203.2 mm (8 inch) outer diameter core, consistently meets the warpage specifications. (Even if it is a carrier tape that meets its specifications at the time of manufacture), it is the carrier at the transition of the carrier tape adjacent to the flange of the reel (the carrier tape changes its direction with respect to the axis of the hub between the two subsequent layers). This is due to the cold flow that occurs after the tape is evenly wound on the reel, and the inventor has further found this solution.

In accordance with the present invention, there is provided a combination of a length of element carrier tape and a reel of the type described above, the reel having a hub having a peripheral surface against which the element carrier tape is placed. Evenly wound in multiple layers in a spiral, the carrier tape hugging in each layer is arranged edge-to-edge, so that they are displaced from each other by the width of the carrier tape, and of the subsequent two layers. The opposite edges of the carrier tape hug are at opposite angles with respect to the hub axis, where the peripheral surface of the hub is of the formula:

[Equation 2] Has a minimum diameter D determined by where W is the width of the carrier tape mm.

Such a hub diameter (eg, about 226 mm (8.9 inches) for an 8 mm wide element carrier tape) allows for: That is, the element carrier tape meets the above warpage specifications despite the cold flow that would occur at the transitions of the carrier tape, as will be explained more fully below, and for element carrier tapes of 8 mm width. Conformance to that specification can ultimately be ensured by the use of the rather large preferred 355.6 mm (14 inch) diameter reel hub.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to FIGS. 1, 2 and 3, there is described a combination of the invention designated 11
(1) a length of element carrier tape 10 having long edges and a uniform width between the edges; and (2) axis 16, axially spaced opposite ends and the ends. A hub (15) having a cylindrical peripheral surface (18) between and a pair of flanges (19) fixed to the hub (15) adjacent to each of the ends and projecting radially from the hub (15). 19 comprises opposing inner surfaces separated by a distance significantly greater than the width of the carrier tape 10 (eg, 76.2 mm or greater).

The element carrier tape 10 is spirally wound in multiple layers evenly around the perimeter surface 18 of the hub 15 such that the carrier tape wraps of each layer are arranged edge-to-edge so that these wraps are formed. Is adapted to be axially displaced by the width of the carrier tape 10 and the opposite edges of the carrier tape 10 hugging in subsequent layers are hubs.
15 is angled in the opposite direction with respect to the axis 16 and the conversion position 20 of the carrier tape 10 is the flange of the reel 14.
Located adjacent to 19 (in this turning position 20 the carrier tape 10 is located between the two layers of the hugging shaft 16 of the hub 15).
Change that direction).

Carrier tape 10 on hub 15 of reel 14
It has been found that the carrier tape 10 is warped due to the cold flow in the conversion portion 20 of the carrier tape 10 shortly after being evenly wound, and the present invention, as will be explained in detail later, A sufficiently large diameter is provided for the peripheral surface 18 of the hub 15 to minimize the amount of carrier tape bow that is caused by cold flow.

The carrier tape 10 is unitary and has various uniform widths (eg, 8, 12, 16, 24, 32) between its edges.
Or 44 mm) and is thin so that it is flexible (eg any thermoplastic crystalline or amorphous material such as polyester, polycarbonate, polypropylene, styrene, butadiene, ABS). Made from plastic etc., about 0.0
Having a thickness of 12 to 0.04 cm, and typically 0.025 cm).

The carrier tape 10 includes a strip-like portion 22 defining an upper surface for the tape 10 and a number of similarly shaped pockets 24 disposed along the carrier tape 10.
And has a wall portion open through its top surface.

The wall portion is a US patent issued on February 6, 1990.
No. 4,898,275, an anti-shoulder shoulder for limiting the side wall portion defining one pocket 24 of the carrier tape 10 on the reel to the carrier tape 10 below it. May or may not be included.

The carrier tape 10 also has a series of regularly spaced through holes 26 of one size along one edge of the strip-like portion 22, which holes define the teeth of the drive sprocket. Upon receipt, the sprocket drives the carrier tape 10 through an automated device which puts the element in pocket 24 or pocket 24.
To get the element from.

Further, the carrier tape 10 has a pocket 24.
Has an opening approximately in the center of the bottom wall of each of the, which allows the presence of elements in pocket 24 to be detected,
Or as required by industry standards to allow access to the probe to facilitate removal of the element from pocket 24.

The hub 15 of the reel 14 is preferably a rigid hollow cylindrical tube of paper material, and the flange 19 is preferably a disk of corrugated paper material attached to the ends of the hub 15 by a plurality of staples 28. .. Flange 19
Has a central opening 30 around which the flange 19
A hollow cylindrical reinforcing journal tube 31 (also a paper material) extending therebetween is fixed, and a spindle can be arranged through the opening 30 and the tube 31 to rotatably support the reel 14.

The flange also has a radially extending opening 32 which allows visual inspection of the amount of element carrier tape 10 remaining on the reel, the flange also having a drive opening 33 adjacent the opening 30. However, an external drive element can be arranged in this drive opening so as to be rotatable with the reel 14.

The flange 19 of the reel 14 is compressed at its periphery to limit the interlocking of the edges of the element carrier tape 10 that is wound onto or unwound from the hub 15, and the other side along line 34. Reel 14 is provided to provide a bend in flange 19 away from flange 19 for visual inspection of the amount of element carrier tape 10 remaining on reel 14 or to facilitate delivery to a paper product collector. Rectangular wire to reduce the diameter of
It may be compressed or scored along 34.

The following is mathematically estimated. That is, an element carrier tape 10 of width W (mm) is evenly wound on the hub 15 of the reel 14 and adjacent to the flange 19 of the reel 14 in the manner illustrated and described with reference to FIGS. The element carrier tape 10 due to the cold flow that will occur at the conversion portion 20 of the carrier tape 10.
In order not to deviate from the above industry standards (ie, the non-cumulative warpage of carrier tape 10 must be less than 1 mm for a length of 250 mm), the peripheral surface 18 of hub 15 has the following formula:

[Equation 3] Should have a minimum diameter D determined by

The basis of this equation described below is illustrated in FIGS. 4 and 5. FIG. 4 shows a test length of 250 mm of the element carrier tape 10 which is warped in an arc shape to the maximum degree (that is, the warp Y is 1 mm) allowed under the above-mentioned industrial specifications (the test length is shown as 2 × Z). , Z is 125 mm long). From the relationship shown in FIG. 4, it can be seen that R is the minimum radius that meets the above industry standards and the following equation applies:

X + Y = R X ² + Z ² = R ² Y = 1 mm (ie, the maximum allowable warpage in a 250 mm element carrier tape) and Z = 125 mm (ie,
Solving the above equation simultaneously under the exemplified conditions, where Z is half the 250 mm test length of the element carrier tape indicated by the code, gives an R value of 7813 mm.
This is the element carrier tape 10 shown in FIG.
Is the radius of the circle bounded by the outer edge of the test length, and the minimum radius of the circle that can be bounded by the outer edge of the test length to which the above industry standards will be met.

In FIG. 5, one flange 19 of the reel 15 is shown, and in addition the hugs Z1 and Z2 are the axes of the hub 15.
Shown are two succeeding hugs Z1 and Z2 in different layers connected by one of the conversion sites 20 of the element carrier tape 10 which is bent to allow it to have an angle in the opposite direction with respect to 16. This bending will result from the cold flow in the carrier tape 10 caused by the opposite angle as described above.

From the relationship shown in FIG. 5, which is substantially the same as that shown in FIG. 4, the following can be understood. That is, the following formula applies: X + Y = R X ² + Z ₁ ² = R ² and an R value of 7813 mm, which is the carrier tape 10 of the exemplified length which the above-mentioned industry standards will be met. The minimum radius of the circle bounded by the outer edge of

Y = width W of the carrier tape (ie,
When the element carrier tape 10 is wound edge-to-edge on the peripheral surface 18 of the hub 15, a complete wrapping Z of the carrier tape 10 is obtained.
1 and the edge of the carrier tape 10 adjacent the flange 19 at the end of Z2 will be separated from the flange 19 by the same Y as the width W of the tape) and Z ₁ is equal to 0.5πD If solved, the above equation as described above:

[Equation 4] Is given.

Z1 of element carrier tape 10 in different layers
The shape of the hugs designated as Z2 and Z2 and the turning point 20 connecting them does not form a smooth circle, but the smooth circle approximation is believed to be close enough as a valid approximation.

The minimum diameter hub 15 determined by the above equation
[For example, about 226 mm (8.9 inches) for an 8 mm (0.31 inch) wide element carrier tape, about 274 mm (10.8 for a 12 mm (0.47 inch) wide element carrier tape.
Inch); about 317.5mm (12.5 inches) for a 16mm (0.63 inch) wide element carrier tape, about 388.6mm (1 for a 24mm (0.94 inch) wide element carrier tape.
5.3 inch), about 449.6 mm (17.7 inch), 44 mm (1.73 inch) for 32 mm (1.26 inch) wide element carrier tape
Inch) width for element carrier tape about 527.1mm
(20.7 inches), and the use of reels of about 594.4 mm (23.4 inches) for 56 mm (2.2 inches) wide element carrier tapes may cause errors that may occur in even winding on the carrier tape 10, or It would make little difference to the above approximation introduced in the equation.

Therefore, for a reel having a hub 15 diameter substantially larger than the minimum diameter given by the above formula, eg, 8 mm or 12 mm wide element carrier tape 10, 35
A reel having a diameter of 5.6 mm (14 inches) is preferably used.

The following equation:

[Equation 5] Solving and selecting hub 15 diameter D for reel 14
And the width W of the element carrier tape 10 wound on it and the value determined for R divided by the minimum radius R of 7813 mm determined as described above with reference to FIG. It is useful to determine the% of its minimum radius that the carrier tape at will follow.

From such a calculation, 355.6 mm (14 inches)
The 8 mm wide carrier tape 10 wound on the peripheral surface 18 of the diameter hub 15 is approximately the maximum radius it may follow.
A 12mm wide carrier tape 10 wound on the peripheral surface 18 of a hub 15 of 355.6mm (14 inch) diameter gives a good safety factor, subject to a radius of curvature of 40%, and the maximum it may follow. According to the radius of curvature, which is about 60% of the radius,
It is still expected to meet the above industry standards and will give a good safety factor.

While the present invention has been described in some detail above, many changes may be made without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a perspective view of the inventive combination of element carrier tapes evenly wound on a reel.

FIG. 2 is an enlarged side view of the element carrier tape evenly wound on the reel shown in FIG.

FIG. 3 is an enlarged partial side view of the element carrier tape evenly wound on the reel shown in FIG.

4 is a schematic diagram illustrating the derivation of the minimum diameter formula for the reel hub of FIGS. 1, 2, and 3. FIG.

5 is a schematic diagram illustrating the guidance of the minimum diameter of the hub of the reel of FIGS. 1, 2 and 3. FIG.

[Explanation of symbols]

 10 ... Carrier tape 14 ... Reel 15 ... Hub 16 ... Shaft 18 ... Hub peripheral surface 19 ... Flange

Claims (3)

[Claims] 1. A length of element carrier tape (10) having long edges and a uniform width between the edges; and an axis (1).
6), a hub (1) having axially spaced opposite ends and a cylindrical peripheral surface (18) between the ends.
5), and a pair of flanges (19) fixed to the hub (15) adjacent to each of the ends and projecting radially from the hub (15) (the flanges being the carrier tape (10). ) Having opposite inner surfaces separated by a distance that is significantly larger than the width of said), said element carrier tape (10) spiraling around a peripheral surface (18) of said hub (15). Are uniformly wound in layers and the carrier tape (10) is hugged in each layer so that they are axially displaced relative to each other by the width of the carrier tape (10). And the opposite edges of the hugging of the carrier tape (10) in the next layer are angled in opposite directions with respect to the axis (16) of the hub (15); and the peripheral surface of the hub (15). (18) is the following formula: ] A combination having a minimum diameter D, where W is the width mm of the carrier tape (10). 2. The width of the carrier tape (10) is 8 mm.
And the hub diameter is 355.6 mm (14 inches)
The combination of claim 1, wherein 3. The width of the carrier tape (10) is 12 mm.
And the hub diameter is 355.6 mm (14 inches)
The combination of claim 1, wherein