KR100598419B1 - Apparatuse for Stretching Film Using Zero Pressure - Google Patents

Abstract

The present invention relates to a thin film stretching apparatus, and in particular, a lower mold insert groove for inserting a lower mold is formed on the upper surface, a vacuum suction unit is formed around the lower mold insert groove, and a negative pressure applying hole is formed at the center of the base. Base installed; A vertical transfer part positioned vertically spaced apart from an upper surface of the base and vertically moving with respect to the base; An upper plate mold detachably attached to an end of the upper and lower transfer parts to vertically move with respect to the base to engage with the lower plate mold at the lowest point; An outer clamp positioned apart from the base and the upper and lower conveying parts, the outer clamp compressing a thin film positioned at an outer portion of the lower plate mold at a lowest point by vertically moving vertically with respect to the base; A vacuum pump providing a vacuum to the vacuum suction unit; And a negative pressure generating unit attached to the bottom of the base to provide a test sound pressure to the thin film through the negative pressure applying hole. When the thin film is positioned on the upper surface of the lower mold, the outer clamp is formed on the outer side of the thin film. The upper and lower conveying unit couples the upper mold to the lower mold inserted into the base, and the vacuum pump provides a vacuum state to extend the thin film, and the negative pressure generating unit applies a test sound pressure to the stretched thin film. By providing, it is possible to provide a uniform tension value, to automatically measure the tension value of the thin film, there is an effect that can automate the thin film stretching process.

Thin Film, Extension Device, Vacuum Pressure, Sound Device, Speaker, Thin Film, Extension, Zero Pressure, Acoustic Device, Speaker

Description

Thin film stretching device using vacuum pressure {Apparatuse for Stretching Film Using Zero Pressure}

1 is a perspective view of a thin film stretching apparatus according to an embodiment of the present invention.

Figure 2a is a front view of the thin film stretching apparatus according to an embodiment of the present invention.

Figure 2b is a side view of a thin film stretching apparatus according to an embodiment of the present invention.

3 is a block diagram of a thin film stretching apparatus according to an embodiment of the present invention.

4A is a top view of a base according to an embodiment of the invention.

4B is a cross-sectional view of the base in accordance with an embodiment of the present invention.

5 is an assembly view of the upper mold and lower mold according to an embodiment of the present invention.

6 is a front view and a side view of a roll supply unit according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: base 20: vertical conveying device

30: upper plate mold 32: buffer member

36: guide post 38: ball bush bearing

40: outer clamp 44: clamp cylinder

50: roll supply unit 60: vacuum pump

62: vacuum suction unit 70: negative pressure generating unit

72: copper plate

The present invention relates to a thin film stretching device, and more particularly, to a thin film stretching device that can efficiently stretch a thin film using a vacuum pressure.

In acoustic equipment used in electronic products such as mobile phones, telephones and digital cameras, thin film vibration membranes such as PET (Poly-Ethylene Terephthalate) film are used to convert vibrations caused by sound pressure into electrical signals. By the way, the vibration membrane is to maintain the elongated state, the sensitivity characteristics of the sound equipment depends on the tension value (tension) of the vibration membrane. In particular, in the case of small microphones produced in large quantities, the sensitivity characteristics of the product must be maintained uniformly. For this purpose, a uniform tension value of the vibration membrane must be ensured. However, in the conventional small microphone manufacturing process, a method of stretching a thin film by applying a mechanical load to the thin film using a weight is used. Since this method is affected by external factors such as changes in process environment, there is a problem that it is difficult to maintain a uniform tension value for each process. Due to this problem, the deviation of the sensitivity characteristics of the product is severe and the yield of the product is seriously lowered.

 The present invention is to solve the above problems, it is possible to provide a uniform tension value by applying the vacuum pressure provided by the vacuum pump to the thin film through the vacuum suction unit installed in the base, the test sound pressure provided by the sound pressure generating unit The tension value of the thin film can be measured by applying it to the thin film through a copper plate with a negative pressure applying hole at the bottom of the base, and automating the thin film stretching process for vibrating film production using the upper plate mold coupled to the outer clamp and the vertical moving device. An object of the present invention is to provide a thin film stretching apparatus using vacuum pressure.

According to another embodiment of the present invention, the upper plate mold is coupled to the vertical movement device through the buffer member to provide a thin film stretching device using a vacuum pressure that can prevent the deterioration of the device and the thin film due to the compression impact when pressing the upper plate mold. For other purposes.

According to another embodiment of the present invention, the vertical movement device further comprises a top plate mold mounting means, the top plate mounting means by sliding the guide post and the ball bushing bearing using a vacuum pressure to increase the accuracy of the thin film stretching process Another object is to provide a thin film stretching device.

According to another embodiment of the present invention, another object of the present invention is to provide a thin film stretching apparatus using a vacuum pressure to increase the accuracy of the clamping process by moving the outer clamp using two clamp cylinders.

According to another embodiment of the present invention, another object of the present invention is to provide a thin film expansion apparatus using a vacuum pressure to increase the work efficiency by continuously supplying a thin film to the thin film stretching apparatus through a roll supply device.

Finally, according to another embodiment of the present invention, another object of the present invention is to provide a thin film stretching apparatus using a vacuum pressure capable of maintaining the extended state of the thin film by bonding the upper mold and the lower mold by closely contacting the rectangular O-ring.

In order to achieve the above object, in the thin film stretching apparatus using the vacuum pressure according to the present invention, a lower mold insert groove for inserting the lower mold is formed on the upper surface, and the vacuum suction unit is formed around the lower mold insert groove The base of the base is a negative pressure application hole is installed; A vertical transfer part positioned vertically spaced apart from an upper surface of the base and vertically moving with respect to the base; An upper plate mold detachably attached to an end of the upper and lower transfer parts to vertically move with respect to the base to engage with the lower plate mold at the lowest point; An outer clamp positioned apart from the base and the upper and lower conveying parts, the outer clamp compressing a thin film positioned at an outer portion of the lower plate mold at a lowest point by vertically moving vertically with respect to the base; A vacuum pump providing a vacuum to the vacuum suction unit; And a negative pressure generating unit attached to the bottom of the base to provide a test sound pressure to the thin film through the negative pressure applying hole. When the thin film is positioned on the upper surface of the lower mold, the outer clamp is formed on the outer side of the thin film. The upper and lower conveying unit couples the upper mold to the lower mold inserted into the base, and the vacuum pump provides a vacuum state to extend the thin film, and the negative pressure generating unit applies a test sound pressure to the stretched thin film. It is characterized by providing.

The above and other objects and features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show a thin film stretching apparatus according to an embodiment of the present invention. The thin film stretching apparatus includes a base 10, an up-and-down conveying unit 20, an upper mold 30, an outer clamp 40, a vacuum pump 60, and a negative pressure generating unit 70. The base 10 has a lower mold insert groove 12 for inserting the lower mold 31 on the upper surface, a vacuum suction part 62 is formed around the lower mold insert groove 12, and the base 10 A negative pressure application hole is installed on the bottom of the).

The base 10 will be described in more detail with reference to FIGS. 4A and 4B as follows. A negative pressure applying hole 74 having an area corresponding to or smaller than the inner area of the lower mold 31 is provided at the center of the base 10. The sound pressure application hole 74 serves to transfer the test sound pressure generated from the sound pressure generator 70 to be described later to the thin film 35. The method of measuring the tension value of the thin film 35 through the test sound pressure is as follows. Same as When the test sound pressure is applied to the thin film 35, the distance between the negative pressure applying hole and the thin film 35 is generated, and the tension value of the thin film 35 is measured by changing the capacitance. According to the exemplary embodiment of the present invention, the negative pressure applying hole 74 is preferably provided on a copper plate 72 separate from the base 10.

The lower mold insert groove 12 serves to accurately seat the lower mold 31 on the base 10 by irregularities. Meanwhile, a vacuum suction part 62 for extending the thin film 35 is formed around the lower mold insert groove 12. The vacuum suction part 62 is preferably formed through the base 10 to be connected to the vacuum pump 60, as shown in Figure 4b. More preferably, as shown in FIG. 4B, a close contact ring 14 may be installed around the vacuum suction part 62 so that the thin film 35 may be expanded to a vacuum pressure during outer clamping.

The vertical conveying unit 20 is vertically spaced apart from the upper surface of the base 10 and vertically moves relative to the base 10, and the upper mold 30 is detachably attached to the end of the vertical conveying unit 20. The vertical movement relative to the base 10 is coupled to the lower plate mold 31 at the lowest point. The upper and lower transfer part 20 serves to couple the upper mold 30 to the lower mold 31 and extend from one side of the base 10 as illustrated in FIGS. 1 to 3. May be installed on the bent first support member 22.

The up and down conveying unit 20 may be implemented using a hydraulic cylinder, a pneumatic cylinder, or a motor device, and more preferably, a cylinder having at least a diameter of at least 60 mm in order to prevent an error in the press position due to repetitive operation. Preference is given to using. Meanwhile, the upper end of the upper and lower transfer parts 20 may further include an upper mold mounting means 34 to detachably attach the upper mold 30 to the upper mold 10, in which case the upper mold is mounted to prevent an error in the press position. The upper part of the means 34 further includes two guide posts 36 as shown in FIG. 2B, and the first support member 22 is a position at which the guide posts 36 slide as shown in FIG. 1. It is more preferred to further include a ball bush bearing 38 respectively.

On the other hand, in order to uniformly apply the pressure by the upper and lower conveying portion 20 to the four corners of the upper mold 30, the upper mold 30 is applied to the four corners of the upper mold as shown in Figs. It is preferable to couple to the up and down conveying unit 20 via a buffer member 32 such as a spring to contact.

The outer clamp 40 is spaced apart between the base 10 and the up and down conveying part 20, but is vertically moved relative to the base 10 so that the remaining thin film is located at the outermost portion of the lower plate mold 31 at the lowest point ( 35) to compress. It is preferable that the outer clamp 40 performs a clamping operation using a plurality of clamp cylinders rather than using a single clamp cylinder to press the residual thin film 35 more tightly. 1 to 3 are configured to move up and down by clamp cylinders 44 respectively installed on two second support members 42 extending from the rear side of the base 10.

The vacuum pump 60 performs a function of providing a vacuum to the vacuum suction unit 62 through a vacuum tube (not shown). The vacuum pressure generated in the vacuum pump 60 adsorbs the periphery of the thin film 35 positioned above the vacuum suction part 62 of the base 10 to make the entire thin film extended.

The negative pressure generating unit 70 is attached to the bottom surface of the base 10 to provide a test sound pressure to the thin film 35 that is maintained in the stretched state through a negative pressure applying hole formed in the copper plate 72 to measure the tension value. It performs the function. Meanwhile, in the embodiment of FIG. 3, the speaker 70 is directly attached to the bottom surface of the copper plate 72. However, as a method of applying a test sound pressure to the thin film 35 by separately installing the speaker and forming a sound pressure pipe. The negative pressure generating unit 70 may be configured.

According to an embodiment of the present invention, as shown in Figure 2b, Figure 6 is installed on the back of the base 10 is configured to further include a roll supply unit 50 for supplying a thin film 35 in a roll state to extend the thin film It can increase the work efficiency. In this case, the thin film is automatically cut by thin film clamping without cutting the thin film 35 to cut the thin film 35 to an appropriate size, thereby providing an effect of increasing the work efficiency.

Referring to the thin film stretching process by the thin film stretching apparatus according to the present invention. First, when the lower mold 31 is inserted into the lower mold insert groove formed in the base 10, the thin film 35 is positioned on the upper surface of the lower mold 31 by the roll supply part 50 or the like. At this time, the width and length of the thin film 35 to be clamped by the outer clamp 44 to be larger than the total area of the lower plate mold.

Next, the outer clamp 40 moves downward by the clamp cylinder 44 or the like, and the first press operation for pressing the outer portion of the thin film 35 positioned at the periphery of the base 10 and the upper and lower conveying portions 20 Secondary press operations for joining the upper mold 30 with the lower mold 31 are performed simultaneously or sequentially.

In this case, the vacuum pump 60 provides a vacuum state during the first press work and the second press work to extend the thin film 35, and the negative pressure generator 70 provides the test sound pressure to the extended thin film. The tension value of the thin film 35 is automatically measured.

When the above operation is completed, as shown in FIG. 5, the upper mold 30 may be coupled to the coupling screw grooves 30a and 32b formed in the upper mold 30 and the lower mold 31. ) And the thin film 35 positioned between the lower plate mold 31 to maintain the stretched state. More preferably, the lower plate mold 31 further includes a rectangular o-ring groove 32b on which an elastic rectangular o-ring 33 is accommodated, such as an EDPM material, and the upper plate mold 30 is a rectangular o-ring. It can be to be coupled to the lower plate mold 31 via the (33). EDPM is a synthetic rubber series having general rubber characteristics, but it has particular advantages such as combustion rate, weather resistance and heat resistance.

When the coupling of the upper mold 30 and the lower mold 31 is completed, when only the upper and lower transfer parts 20 are raised, the upper mold 30, the thin film 35, and the lower mold 31 are raised to the engaged state. The periphery of the thin film 35, which is kept compressed by the outer clamp, is automatically removed.

According to the thin film stretching apparatus using the vacuum pressure according to the present invention as described above, by applying the vacuum pressure provided by the vacuum pump to the thin film through the vacuum suction unit installed in the base to provide a uniform tension value, the negative pressure generated The tension of the thin film can be measured by applying the test sound pressure provided by the negative pressure to the thin film through the copper plate in which the negative pressure applying hole is formed in the lower part of the base. It offers significant effects that can automate the thin film stretching process.

On the other hand, according to another embodiment of the present invention, the upper plate mold can prevent deterioration of the device and the thin film due to the compression impact when the upper plate mold is pressed by combining with the vertical movement device through the buffer member; The vertical movement device further includes a top mold mounting means, and the top mold mounting means is slid by the guide post and the ball bushing bearing to increase the accuracy of the thin film stretching process; The accuracy of the clamping process can be increased by swinging the outer clamp with two clamp cylinders; It is possible to increase work efficiency by continuously supplying the thin film to the thin film stretching device through the roll feeder; The upper and lower molds are closely attached to each other through the rectangular O-rings to provide another effect of maintaining the stretched state of the thin film.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the scope of the claims You will have to look.

Claims (9)

A base having a negative pressure application hole in a center portion, a lower mold insert groove formed on an upper surface of the center portion, and a vacuum suction portion formed outside the lower mold insert groove; A lower mold inserted into an upper portion of the lower mold insert groove of the base; A vertical transfer part positioned vertically spaced apart from an upper surface of the base and vertically moving with respect to the base; An upper plate mold detachably attached to an end of the upper and lower transfer parts to vertically move with respect to the base to engage with the lower plate mold at the lowest point; An outer clamp positioned apart from the base and the upper and lower conveying parts, the outer clamp compressing a thin film positioned at an outer portion of the lower plate mold at a lowest point by vertically moving vertically with respect to the base; A vacuum pump providing a vacuum to the vacuum suction unit; And It is attached to the bottom of the base is configured to include a sound pressure generating unit for providing a test sound pressure to the thin film through the sound pressure application hole, When the thin film is positioned on the upper surface of the lower mold, the outer clamp compresses the outer portion of the thin film, and the upper and lower transfer parts couple the upper mold to the lower mold inserted into the base, and the vacuum pump maintains a vacuum state. And stretching the thin film, wherein the negative pressure generating unit provides a test sound pressure to the stretched thin film. The method of claim 1, The upper plate mold is an automatic thin film stretching apparatus using a vacuum pressure, characterized in that coupled to the upper and lower conveying portion via a buffer member. The method of claim 2, The buffer member is an automatic thin film stretching apparatus using a vacuum pressure, characterized in that the contact with the four corners of the upper mold. The method according to claim 1 or 2, The vertical conveying unit, the automatic thin film stretching apparatus using a vacuum pressure, characterized in that installed on the first support member which is extended from one side surface of the base is bent. The method of claim 4, wherein The upper and lower conveying portion further comprises a top plate mounting means at the end, the top plate is detachably attached to the lower portion of the mounting means; Two guide posts are further included in the upper portion of the upper mold holding means, and the first support member further includes a ball bush bearing at a position at which the guide post slides. Device. The method according to claim 1 or 2, The outer clamp is an automatic thin film stretching apparatus using a vacuum pressure, characterized in that the vertical movement by the clamp cylinders respectively installed on the two second support members extending from the rear side of the base. The method according to claim 1 or 2, The automatic thin film stretching apparatus, the automatic thin film stretching apparatus using a vacuum pressure further comprises a roll supply unit is installed on the back of the base for supplying the thin film in a roll state. The method according to claim 1 or 2, The lower plate mold further includes a rectangular O-ring groove in which a rectangular O-ring of an elastic material capable of maintaining airtightness is accommodated, and the upper plate mold is coupled to the lower plate mold through a rectangular O-ring. Stretching device. The method according to claim 1 or 2, And the base further comprises a copper plate on which a negative pressure application hole is formed.

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