JP2007209525A - Strap for cellular phone strap, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a strap for a cellular phone strap whose productivity is high and by which obtained products are less likely to be varied. <P>SOLUTION: One end side of a strap-like object 4 the other end of which is fixed is guided to a mold composed of upper and lower molds by a guide pin 5. The strap-like object 4 is stretched along guide grooves 1e continuously so as to pass through the inside of cavities 1d. The strap-like object 4 is stretched so as to pass through all the cavities. Then, after the mold is clamped, a melted resin is injected into the cavities to mold a fixing tool. After a clasp 3 is molded, the unnecessary part of the strap-like object is cut off. Thus, the strap 2 where an engaging tool is provided at one end of the strap-like object formed like a loop is manufactured. The strap-like object can be set to all the cavities in the mold by the single strap-like object, so that work of setting the strap-like object to the mold is performed efficiently in a short period. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pine needle strap for a strap that is most suitable for a portable strap used by being attached to, for example, a mobile phone, and a method for manufacturing the same.

2. Description of the Related Art Conventionally, a portable strap attached to a mobile phone has a function as an ornament in addition to the purpose of preventing the mobile phone from being accidentally dropped when the mobile phone is used.
For this reason, young women and men who attach a plurality of mobile straps to mobile phones are often found in the city, and the demand for mobile straps is also increasing.
In view of such circumstances, the present applicant has previously put the mobile strap described in Patent Document 1 into practical use.
The portable strap described in Patent Document 1 includes a stretchable strap body formed into a coil shape from an elastic resin, a suspension means connected to one end side of the strap body, and the other end side of the strap body. It is comprised from the provided decorative article attachment means.
The strap body formed in a coil shape is easy to use because the strap body expands and contracts when using a cleaner or the like attached to the accessory attachment means, and the strap body has an unusual design appearance. Therefore, it has an effect that it does not get tired even if it is used for a long time.
Utility Model Registration No. 3111015

In the portable strap described in Patent Document 1, a pine needle string formed as a pine needle shape is used as a hanging means.
In the pine needle string, a locking tool is integrally formed of resin on one end side of a string-like material folded in a loop shape, but conventionally, a mold having a cavity for forming the locking tool is formed. Then, after the string-like objects cut in advance to a predetermined length were set one by one for each cavity, the mold was clamped and the locking tool was injection-molded with resin.
According to this forming method, since a plurality of pine needle strings can be formed at a time, the efficiency is good, but the work of setting the string-like material cut into a predetermined length in advance for each cavity takes time, so the productivity is high. In addition, since it takes a lot of man-hours to set the string-like object, there is a problem that the unit price of the pine needle string becomes high.

In addition, since a variation tends to occur when a string-like object is set in each cavity of a mold, there is also a problem that a product obtained after molding also varies, resulting in a decrease in commercial value.
The present invention has been made to remedy such a problem, and an object of the present invention is to provide a pine needle strap for a portable strap that has high productivity and is less likely to cause variations in the obtained product, and a method for manufacturing the same. It is.

  The manufacturing method of the pine needle strap for strap according to the present invention includes a plurality of cavities for forming a fastening device, a guide groove for housing a string-like material partially inserted into the fastening device, and the string-like material as a guide groove. One of the upper and lower molds provided with a plurality of guide pins that are guided in a predetermined shape along the other end of the string-like object with one end fixed is guided by the guide pins and passes through the cavity. Stretch the string-like object along the guide groove with a single stroke and stretch the string-like object so that it passes through all the cavities. After clamping the mold, inject the molten resin into the cavities and stop. After forming the fastening device, after forming the fastening device, an unnecessary portion of the string-like material is cut off to produce a pine needle cord in which a locking tool is provided at one end of the string-like material formed in a loop shape. It is what I did.

By the above method, it is possible to set a string-like object for all cavities in the mold with a single string-like object, so that the work of setting the string-like object in the mold can be performed efficiently in a short time. Thus, the productivity is remarkably improved, so that the pine needle string used for the strap can be obtained at a low cost.
In addition, since the string-like objects are stretched on the guide pins protruding from the mold and the string-like objects are set in the respective cavities, the length of the obtained string-like objects may vary. Therefore, a pine needle string having a stable quality and a high commercial value can be easily obtained.

  In the manufacturing method of the pine needle strap for strap of the present invention, a terminal fixing portion made of a V groove for fixing the end of the string-like object is provided at the end of the mold.

  By the above method, since the end of the string-like object can be fixed simply by fitting the end of the string-like object to the terminal fixing portion and pulling it strongly, the set operation of the string-like object can be performed efficiently in a short time.

  The strap pine needle string of the present invention is a pine needle string in which a locking tool is provided at one end of a loop-shaped string, and a plurality of cavities for forming the fixing tool, One end is fixed to one of the upper and lower molds provided with a guide groove that accommodates a string to insert a part and a plurality of guide pins that guide the string into a predetermined shape along the guide groove. The other end of the string is guided by a guide pin, and the string is stretched along the guide groove with a single stroke so as to pass through the cavity, and the string is passed through all the cavities. After tightening the mold, the mold was clamped and molten resin was injected into the cavity to mold the fastener, and after the fastener was molded, the unwanted part of the string was cut off. It is.

With the above configuration, since a string-like object can be set for all cavities in the mold with a single string-like object, the work of setting the string-like object in the mold can be performed efficiently in a short time. Thus, the productivity is remarkably improved, so that the pine needle string used for the strap can be obtained at a low cost.
In addition, since the string-like objects are stretched on the guide pins protruding from the mold and the string-like objects are set in the respective cavities, the length of the obtained string-like objects may vary. Therefore, a pine needle string having a stable quality and a high commercial value can be easily obtained.

  According to the method for manufacturing a strap pine needle string of the present invention, a string-like object can be set for all cavities in the mold with a single string-like article. Work can be done efficiently in a short time.

Embodiments of the present invention will be described in detail with reference to the drawings.
1 is a perspective view of a mold for forming a strap pine needle string, FIG. 2 is a plan view showing a state before the molded pine string is taken out of the mold, and FIG. 3 is a line AA in FIG. 4 is a plan view of the manufactured pine needle string, FIG. 5 is a cross sectional view taken along the line BB of FIG. 4, and FIG. 6 is a partially cutaway front view showing the use state of the pine needle string.
The mold 1 for molding is composed of an upper mold 1a and a lower mold 1b.
On the mating surface 1c of the upper mold 1a and the lower mold 1b, a plurality of cavities 1d for forming the locking tool 3 are formed.
The locking tool 3 is formed of a cylindrical portion 3a and a truncated conical locking portion 3b formed on one end side of the cylindrical object 3a, and is injection-molded with a resin such as polypropylene (PP). ing.

In the mold 1 for molding the locking tool 3, a cavity 1d for molding the upper half of the locking tool 3 is formed on the upper mold 1a side, and a cavity 1d for molding the lower half is formed on the lower mold 1b side. .
Each cavity 1d is formed with a groove-shaped guide groove 1e for setting the string-like object 4 with a single stroke.
The string-like material 4 is formed in advance by a chemical fiber such as nylon (registered trademark), and the guide grooves 1e for setting the string-like material 4 are respectively formed on the mutually opposing surfaces of the upper die 1a and the lower die 1b. The cross section is formed in a semicircular shape so that the upper half and the lower half of the string-like object 4 can be accommodated by the guide groove 1e.
As shown in FIG. 3, a terminal fixing portion 1f made of a V-groove is formed at the end portion of the guide groove 1e on the end surface of the lower mold 1b for setting the end of the string 4 at the beginning.
The guide groove 1e that goes straight from the end fixing portion 1f toward the first cavity 1d is continuous with the guide groove 1e on the opposite side through almost the center of the cavity 1d, and the end of the guide groove 1e is Of the plurality of guide pins 5 protruding from the mating surface 1c, the first guide pin 5a protruding farthest from the cavity 1d is bypassed and is folded back toward the cavity 1d again.

The pair of second guide pins 5b provided closer to the cavity 1d than the middle between the first guide pin 5a and the cavity 1d are aligned so that the guide groove 1e of the forward path and the backward path are parallel to each other and pass through the substantially center of the rear cavity 1d. Thus, it reaches a pair of third guide pins 5c provided between the cavity 1d and the terminal fixing portion 4b.
The first to third guide pins 5a to 5c are provided in the same positions as the first cavities 1d in the respective cavities 1d, and guide grooves 1e that bypass the third guide pins 5c provided in the first cavities 1d. Is folded back to the second cavity 1d side by the third guide pin 5c provided in the second cavity 1d and reaches the second cavity 1d.

After that, similarly to the guide groove 1e provided in the first cavity 1d, the guide groove 1e that passes between the second guide pins 5b reaches the first guide pin 5a, and bypasses the first guide pin 5a. The guide groove 1e that has passed through the second guide pin 5b and has reached the second cavity 1d again and has passed through the second cavity 1d bypasses the third guide pin 5c, and then the third cavity 1d. Is extended to the third guide pin 5c.
Similarly to the first and second cavities 1d, guide grooves 1e are also formed in the third, fourth,... Cavities 1d, and the guide grooves that have passed between the third guide pins 5d from the last cavity 1d. 1e is connected with the terminal fixing | fixed part 1g which consists of V-groove formed in the end surface of the lower mold | type 1b.

  When the upper mold 1a and the lower mold 1b are mated to the mating surface 1c of the upper mold 1a that matches the position of the first to third guide pins 5a to 5c protruding from the mating surface 1c of the lower mold 1b. A pin hole (not shown) into which the first to third guide pins 5a to 5c are fitted is formed, and at a corner portion of the lower mold 1b, it protrudes from the mating surface 1c of the upper mold 1a. Pin holes 7a into which the knock pins 7 are inserted are formed, and the upper mold 1a and the lower mold 1b can be aligned by inserting the knock pins 7 into these pin holes 7a.

Next, a method of manufacturing the pine needle strap for strap shown in FIG. 4 using the above-described mold 1 will be described.
In a state where the upper mold 1a and the lower mold 1b of the mold 1 are divided, first, a string 4 made of nylon or the like is set on the lower mold 1b.
In setting the string-like object 4, first, when one terminal 4a of the string-like object 4 is inserted into the terminal fixing portion 1f and the terminal 4a is pulled downward strongly, the string-like object 4 as shown in FIG. The terminal 4a is bite into the V groove of the terminal fixing portion 1f and fixed.
Next, when the string-like object 4 is passed between the third guide pins 5c projecting in the vicinity of the first cavity 1d, the first guide passes between the second guide pins 5b through the center of the first cavity 1d. When the first guide pin 5a is detoured by extending to the pin 5a, it is again extended from the cavity 1d to the third guide pin 5c through the second guide pin 5b.
Then, when one of the third guide pins 5c is detoured, the third guide pin 5c is stretched to the second cavity 1d side through the third guide pin 5c protruding in the vicinity of the adjacent second cavity 1d.

The string-like object 4 is formed on the second and third guide pins 5b and 5c projecting in the vicinity of the cavities 1d and the first guide pin 5a projecting at a position away from the cavities 1d. Is stretched, the other terminal 4b of the string-like object 4 is inserted into the terminal fixing portion 1g and pulled downward strongly to fix the other terminal 4b.
In this state, the string-like object 4 is floating from the guide groove 1e formed in the lower mold 1b. Next, the knock pins 7 protruding from the upper mold 1a are fitted into the pin holes 7a of the lower mold 1b. By inserting and aligning the upper mold 1a and the lower mold 1b, the string-like object 4 that has been floating up to now is pushed by the upper mold 1a and the guide groove 1e formed in the upper mold 1a. It is accommodated in a guide groove 1e formed in the lower mold 1b.

Next, when the upper mold 1a and the lower mold 1b are clamped by mold clamping means of an injection molding machine (not shown), a molten resin such as polypropylene is injected into the cavity 1d formed between the upper mold 1a and the lower mold 1b. The locking tool 3 is injection molded by the cavity 1d.
After that, when the resin is cured, the upper die 1a is divided, and the fastening device 3 with the string-like material 4 inserted is left in the lower die 1b as shown in FIG. 2, so the terminals 4a and 4b of the string-like material 4 are connected to the terminals. The fastening device 3 is released from the lower mold 1b by pulling it out from the fixing portions 1f and 1g and pulling out the string-like object 4.

Since the fastening device 3 taken out from the lower mold 1b is connected to the string-like object 4, unnecessary portions of the string-like material 4 are cut at the locking portion 3b of the fastening device 3 to stop By separating the dressing, a pine needle string as shown in FIG. 4 is obtained.
The pine needle string obtained as described above is in a state in which a part of the string-like object 4 is inserted in the center of the fastening device 3 as shown in FIG. 5, and the fastening device 3 is injection-molded. Since the resin penetrates into the string-like material 4 softened by the heat of the resin and the locking tool 3 is welded to the string-like material 4, even if a strong tensile force acts on the locking tool 3. The fastening device 3 does not come off from the string 4.

On the other hand, the pine needle strap for straps manufactured as described above is used by being attached to, for example, a mobile phone.
FIG. 6 shows an example of a strap for a mobile phone. The strap main body 10 is formed into a coil shape from an elastic resin, and an annular portion 10 a is formed on one end side of the strap main body 10.
The hook 3 is attached to the annular portion 10a, and can be easily attached by simply press-fitting the locking portion 3b of the fastener 3 into the annular portion 10a.
The connection part of the strap body 10 and the pine needle string is covered with a cap 11 previously inserted into the string-like object 4, so that the exposed part of the fastening device 3 is only the locking part 3b, and the appearance is good. By attaching an ornament (not shown) such as a cleaner or character to an ornament attachment means 12 such as an eggplant provided on the other end side of the strap body 10, a mobile phone strap having a high decorative effect can be obtained. Be able to.

In the above-described embodiment, an example in which four cavities 1d are formed in the mold 1 is illustrated. However, in order to manufacture a large number of pine needle cords at the same time, A lot of cavities 1d are formed.
Moreover, although the terminal fixing | fixed part 1f and 1g which fix the terminal 4a, 4b of the string-like thing 4 were formed by the V-groove, you may form in a semicircle shape a little smaller diameter than the outer diameter of the string-like thing 4, If the terminal 4a, 4b of the thing 4 can be fixed, it will not be limited to the shape.
Further, although an example in which a pine needle string is used as a strap for a mobile phone has been described, it can be used as a string or strap for hanging small items, and of course, the application is not limited.

It is a perspective view of the division | segmentation state of the metal mold | die used for the manufacturing method of the pine needle strap for straps which becomes embodiment of this invention. It is a top view before taking out the pine needle string manufactured by the manufacturing method of the pine needle string for straps which becomes embodiment of this invention from a metal mold | die. It is sectional drawing which follows the AA line of FIG. It is a top view of the pine needle string manufactured by the manufacturing method of the pine needle string for straps which becomes embodiment of this invention. It is sectional drawing which follows the BB line of FIG. It is a partially notched front view which shows the use condition of the pine needle string manufactured by the manufacturing method of the pine needle string for straps which becomes embodiment of this invention.

Explanation of symbols

1 Mold 1a Upper mold 1b Lower mold 1e Guide groove 1f Terminal fixing part 1g Terminal fixing part 2 Pine needle string 3 Fastening tool 4 String-like object 5 Guide pin

Claims (3)

  A plurality of cavities for forming the fastening device, a guide groove for accommodating a string-like object into which a part of the fastening tool is inserted, and a plurality of guides for guiding the string-like material into a predetermined shape along the guide groove One of the upper and lower molds provided with a guide pin is guided by the guide pin on the other end of the string-like object with one end fixed, and is drawn in the guide groove so as to pass through the cavity. The string-like object is stretched along the cable body, and the string-like object is stretched so as to pass through all the cavities. After the mold is clamped, the molten resin is injected into the cavity to fix the stringer. , And after forming the fastening device, an unnecessary portion of the string-like material is cut off to produce a pine needle cord in which a locking tool is provided at one end of the loop-shaped string-like material. Method for producing a pine needle strap for a strap   The manufacturing method of the pine needle strap for straps of Claim 1 which provides the terminal fixing | fixed part which consists of V groove | channel which fixes the terminal of the said string-like object in the edge part of the said metal mold | die. A pine needle string provided with a locking tool at one end of a loop-shaped string-like object, and a plurality of cavities for forming the fastener, and a string-like object partially inserted into the fastener In addition to a string-like object, one end of which is fixed to one of upper and lower molds provided with a guide groove for receiving a guide and a plurality of guide pins for guiding the string-like object in a predetermined shape along the guide groove. The string-like object is stretched along the guide groove with a single stroke so that the end side is guided by the guide pin and passes through the cavity, and the string-like object is passed through all the cavities. After tensioning, the mold is clamped, molten resin is injected into the cavity to form a fastening device, and after the fastening device is molded, unnecessary portions of the string-like material are cut off. A pine needle strap for straps that is manufactured.

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