JPH10120254A - Web feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent excessive winding back of a web and the occurrence of loosening of a web accurately by providing an outer peripheral face braking means which gives braking force to an outer peripheral face of a winding body of the web which is wound back in a web supply device which supplies the web by winding it back from the winding body of the web. SOLUTION: A winding body 101 of a web 102 is supported on a support column 104 fixed on a frame 103 through a bearing 105 in such a manner that it can turn freely, and an outer peripheral face braking means 106 is provided in the frame 103 in such a manner that it is sandwiched between the frame 103 and the winding body 101. This outer peripheral face braking means 106 is constituted by a braking action part 107 and a pressing pressure generation part 108 consisting of a compression spring, and the braking action part 107 is brought into contact with an outer periphery of the winding body 101 so that braking force acts. Consequently, large braking force is given when an outside diameter of the winding body 101 is large, and small braking force is given when an outside diameter of the winding body 101 is small to maintain tension of the web 102 which is wound back at constant tension.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention belongs to the technical field of feeding a web to a machine, that is, rewinding the web. A web supply device that unwinds a web from a winding body and supplies the web to a machine, and particularly has a simple mechanism as a braking mechanism that brakes the rotation of the winding body when rewinding the web from the winding body. It relates to a web supply device.

[0002]

2. Description of the Related Art In a machine to which a web is supplied, a braking mechanism for braking the rotation of a web winder prevents the web from meandering, loosening, and hunting and stabilizes the behavior of the web. At the same time, in the web supply device that supplies the web, a sufficient braking torque is applied to the winding body, and in the case of a sudden change in the speed of the web or a stop operation, the web is unwound excessively or the web is unwound due to inertia of the winding body. Prevents loosening. As a braking mechanism in a conventional web supply device,
A brake device capable of mechanically setting the braking strength is used for the shaft of the winding body. In this brake device, a set constant braking strength is applied to the winding body, and it can be realized as a simple and small brake device.

[0003]

However, if the outer diameter of the take-up body is adjusted to increase the braking strength when the outer diameter of the take-up body is large, the operation is performed. If the braking strength is too high, the torque of the sheet feeding device becomes insufficient and the web cannot be pulled out. On the other hand, in the opposite case, when the outer diameter of the winding body is large, the braking torque is insufficient, and problems such as hunting and meandering occur. Therefore, a brake device that can electrically control the braking strength is provided on the shaft of the winding body, the tension of the unwound web is detected by a tension detection device, and the brake device is feedback-controlled based on the detected tension. That is being done.

However, the braking mechanism used in the above-mentioned conventional web supply device is composed of a brake device, a tension detecting device, a feedback control device, etc., which can electrically control the braking strength. Are extremely complex and large. Therefore, when it is desired to supply the web using a simple and small web supply device due to a demand for an installation space or the like, the controllable braking mechanism cannot be used. SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple and compact web feeder having a controllable braking mechanism for generating an appropriate braking torque in accordance with the outer diameter of the winding body.

[0005]

The above objects are achieved by the present invention described below. That is, the present invention provides a web feeder that rewinds and supplies a web from a web winding body, the web having an outer circumferential surface braking unit that applies a braking force to an outer circumferential surface of the web winding body to be unwound. Supply device "
It is. According to the web supply device of the present invention, a braking force acts on the web winding body unwound by the outer peripheral surface braking means from the outer peripheral surface. The outer peripheral surface braking means provides a large braking force when the outer diameter of the web take-up body is large, and provides a small braking force when the outer diameter of the web take-up body is small. Can be realized. Therefore, a simple and small-sized web supply device having a controllable braking mechanism is provided.

According to the present invention, there is provided the present invention, wherein the outer peripheral surface braking means has a braking action portion and a pressure generating portion, and the braking action portion applies a braking force by coming into contact with the outer peripheral surface of the web winding body. The pressing portion is a web supply device that has one end supported by a frame that rotatably supports the web winding body about its axis, and the other end pressing the braking action portion. According to the web supply device of the present invention, the outer peripheral surface braking means has the braking action portion and the pressure generating portion, and the pressure generating portion having one end supported by the frame that rotatably supports the web winding body around its axis. The braking action portion is pressed by the other end of the portion, and the braking action portion is brought into contact with the outer peripheral surface of the web winding body so that a braking force is applied. Since the braking action section and the pressure generating section are configured, the braking force can be changed over a wide range by design or adjustment thereof. Further, the present invention is "a web supply device in which the pressing portion is a compression spring or a tension spring". By using a compression spring or a tension spring for the pressing portion, the braking mechanism can be made extremely simple and small.

The present invention also provides a web supply device for supplying a web by rewinding the web from a web take-up body, wherein a braking torque corresponding to the weight of the web take-up body to be unwound is applied to the web take-up body. Web feeder having weight-sensitive shaft braking means acting on the shaft. " According to the web supply device of the present invention, a braking torque corresponding to the weight of the web winding body unwound by the weight-sensitive shaft braking means acts on the shaft of the web winding body. The weight-sensitive shaft braking means applies a large braking force when the weight of the web take-up is large, and provides a small braking force when the weight of the web take-up is small. That is, the application of a braking force suitable for the inertial movement of the web winding body can be realized by a simple and small mechanism, and therefore, a simple and small web supply device is provided.

According to the present invention, the weight-sensitive shaft braking means has a weight-sensitive portion and a variable braking portion, and the weight-sensitive portion varies the mechanical displacement according to the weight of the web winding body. A web supplying device that transmits a braking torque according to the displacement to a shaft of a web take-up body that transmits the braking torque to a braking action section. According to the web supply device of the present invention, the weight-sensitive shaft braking means has a weight-sensitive portion and a variable braking portion, and the mechanical displacement is varied by the weight-sensitive portion according to the weight of the web winding body. The braking torque is transmitted to the web portion, and the braking torque corresponding to the displacement is applied to the axis of the web winding body by the variable braking action portion. Since the weight responsive part and the variable braking action part are configured, the braking force can be widely changed by the design or adjustment thereof. The present invention is also a "web supply device in which the weight responsive part is a compression spring". By using a compression spring for the weight sensitive part, the braking mechanism can be made extremely simple and small. Also, the present invention provides a web feeder, wherein the variable braking action portion changes an area of a friction portion acting on a shaft of a web winding member or a peripheral surface of a member fixed to the shaft in accordance with a displacement of the weight sensing portion. ". By changing the area of the friction portion in accordance with the displacement of the weight sensitive portion, the braking mechanism can be made extremely simple and small.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to embodiments. FIG. 1 is an explanatory diagram of a web supply device (Example 1) of the present invention. In FIG. 1, 101 is a web take-up body, 102 is a web to be unwound from the take-up body 101, 103 is a frame of a web supply device, 104 is a column fixed to the frame and supporting a shaft of the take-up body 101, 10
5 is a bearing for rotatably supporting the axis of the winding body 101, 10
Reference numeral 6 denotes an outer peripheral surface braking unit, 107 denotes a braking operation unit of the outer peripheral surface braking unit 106, and 108 denotes a pressing generation unit of the outer peripheral surface braking unit 106. In FIG. 1, an arrow “→” of the winding body 101 indicates a rotation direction about the axis of the winding body 101, and an arrow “→” of the web 102 indicates a web 102 for rewinding and supplying.
3 shows the transfer direction.

As shown in FIG. 1, a column 104 is fixed to a frame 103, a bearing 105 is supported by the column 104, and a winding body 101 of a web 102 is rotatably supported by the bearing 105. On the other hand, the outer peripheral surface braking means 106 is also supported by the frame 103, and the outer peripheral surface braking means 106 is provided so as to be sandwiched between the frame 103 and the winding body 101. Therefore, the outer peripheral surface braking unit 106 applies a braking force by making the entire length slightly longer than the distance between the frame 103 and the winding body 101 by contacting the outer peripheral surface of the winding body 101.

As described above, since the outer peripheral surface braking means 106 exerts a braking force on the outer peripheral surface of the winding body 101 of the web 102, when the outer diameter of the winding body 101 is large, a large braking force (braking force) is applied. Torque) to provide a small braking force (braking torque) when the outer diameter of the winding body 101 is small. This is consistent with the following general facts: When the outer diameter of the winding body 101 is large and the weight is large, the winding body 101 has a large inertia force. On the contrary, to stop the rotation of the winding body 101, a large braking force is required. On the other hand, when the outer diameter of the winding body 101 is small and the weight is small, the inertia force is small and the winding body 10
A small braking force is required to stop one rotation.

As shown in FIG. 1, the outer peripheral surface braking means 106 includes at least a braking action portion 107 and a pressure generating portion 108.
Consists of The braking action portion 107 is a portion that contacts the outer peripheral surface of the winding body 101 of the web 102 and applies a braking force. It is preferable to use a member having a smooth surface and a durability against friction so that the portion in contact with the outer peripheral surface of the winding body 101 in the braking action portion 107 does not damage the surface of the web 101. . For example, a member formed by mirror-finishing the surface of a metal material such as stainless steel, or attaching a sheet of abrasion-resistant plastic, woven fabric, nonwoven fabric, leather or the like to the metal material can be used.

The pressure generating section 108 has one end supported by the frame 103. Further, the frame 103 supports a bearing 105 that rotatably supports the winding body 101 of the web 102. Then, the other end of the pressure generating section 108 presses the braking action section 107. It is preferable that the pressure generating unit 108 be configured using a compression spring. When a compression spring is used, the pressing force generated by the compression spring changes depending on the degree of compression. When the compression spring is largely compressed, the entire length of the pressure generating portion 108 is shortened, that is, the outer peripheral surface braking means 106 is shortened, and the pressing force is increased.

This corresponds to the case where the outer diameter of the winding body 101 is large in FIG. As described above, the winding body 101
The braking force (braking torque) acting on the outer peripheral surface of the winding body 10
The larger the outer diameter of 1, the stronger the action. In addition to the effect, when a compression spring is used, the effect that the pressing force increases as the outer diameter of the winding body 101 increases is increased, and the braking force further increases. Note that the weight of the winding body 101 changes substantially by the square of the outer diameter. When the outer diameter is large, a larger braking force is generally required than in proportion to the outer diameter. On the other hand, the winding body 101
The operation of the pressure generating portion 108 when the outer diameter is small is the reverse of the case when the outer diameter is large, and the analogy is easy from the above description, so that the description is omitted.

FIG. 1 is a schematic explanatory view, and details of the configuration are omitted. For example, when a pressing force is generated by the pressing generator 107 of the outer peripheral surface braking means 106 to bring the braking action part 107 into contact with the outer periphery of the winding body 101 and apply a braking force, the outer peripheral surface braking means 1
06 exerts a force in the rotation direction of the winding body 101. The outer peripheral surface braking means 106 needs a means for canceling the force in the rotational direction, but it is natural that such means is provided, and it can be constituted by a known technique and is not a characteristic part of the present invention. Omitted from

Next, an embodiment will be described based on another example different from the above. FIG. 2 is an explanatory diagram of a web supply device (Example 2) of the present invention. In FIG. 1, 201 is a web take-up body, 202 is a web to be unwound from the wind-up body 201, 203 is a frame of the web supply device, 204 is a column fixed to the frame and supporting a shaft of the wind-up body 201, 20
5 is a bearing for rotatably supporting the axis of the winding body 201;
6 is an outer peripheral surface braking means, 207 is a braking action part of the outer peripheral surface braking means 206, and 208 is a pressing generation part of the outer peripheral surface braking means 206. In FIG. 2, the arrow “→” of the winding body 201 indicates the rotation direction around the axis of the winding body 201, and the arrow “→” of the web 202 indicates the web 202 to be rewound and supplied.
3 shows the transfer direction.

As shown in FIG. 2, a column 204 is fixed to a frame 203, a bearing 205 is supported by the column 204, and a winding body 201 of a web 202 is rotatably supported by the bearing 205. On the other hand, the outer peripheral surface braking means 206 is also supported by
6 is provided so as to sandwich the support 204 and the winding body 201. Therefore, when the braking action portion 207 of the outer peripheral surface braking means 206 reduces the distance from the outer peripheral surface of the winding body 201 and comes into contact with the outer peripheral surface of the winding body 201, a braking force is applied.

In FIG. 2, one end of the pressure generating section 206 is rotatably supported by the column 204 and the other end thereof is
7 and a tension spring that is supported at one end by the column 204 and pulls the arm toward the column 204 at the other end. When a tension spring is used, the pressing force generated by the tension spring changes depending on the degree of tension. Since the action of the pressing force that changes according to the outer diameter of the winding body 201 is the same as that described with reference to FIG. 1, the description is omitted here.

Next, an embodiment will be described based on another example different from the above. FIG. 3 is an explanatory diagram of a web supply device (Example 3) of the present invention. 3, reference numeral 301 denotes a web take-up body, 302 denotes a web to be unwound from the take-up body 301, 303 denotes a frame of a web supply device, 304 denotes a column fixed to the frame and supports a shaft of the take-up body 301, 30
5 is the axis of the winding body 301 (or the axis of the winding body 301 or the axis for fixing the paper tube), 306 is a weight-sensitive axis braking means, 307
308 is a variable braking action part of the weight sensitive shaft braking means 306, 308
Is a weight-sensitive part of the weight-sensitive shaft braking means 306. In FIG. 3, an arrow “→” of the winding body 301 indicates a rotation direction around the axis of the winding body 301, and an arrow “→” of the web 302 indicates a transport direction of the web 302 to be rewound and supplied. .

As shown in FIG. 3, a column 304 is fixed to a frame 303, and a weight-sensitive shaft braking unit 306 is supported by the column 304. Further, the weight-sensitive shaft braking unit 306 connects the winding body 301 to a shaft 305. We support in. The weight-sensitive shaft braking means 306 applies a large braking torque to the shaft 305 when the weight of the winding body 301 of the web 302 is large, and applies a small braking torque to the shaft 305 when the weight is small. Act. This is consistent with the following general facts: When the weight of the winding body 301 is large, the winding body 301 has a large inertia force. On the contrary, a large braking force is required to stop the rotation of the winding body 301. on the other hand,
When the weight of the winding body 301 is small, the inertia force is small and the rotation of the winding body 301 is stopped, so that only a small braking force is required. That is, the above-described operation of the weight-sensitive shaft braking means 306 has rationality.

As shown in FIG. 3, the weight-sensitive shaft braking means 306 comprises at least a variable braking section 307 and a weight-sensitive section 308. The variable braking portion 307 is a portion that applies a braking force to the shaft 305 of the winding body 301 of the web 302. In FIG. 3, the shaft 305 of the winding body 301
Is shown in such a manner that the braking force is exerted by directly contacting the peripheral surface of the winding member 301. However, a rotation transmission means such as a brake drum is fixed to the shaft 305 of the winding body 301, and
May directly contact the rotation transmitting means to apply a braking force, and may indirectly apply a braking force to the shaft 305.

The variable braking action portion 307 has a material or configuration capable of receiving the weight of the winding body 301 and restoring deformation. For example, a thin band-like spring having high elasticity, or steel or leather for a blade is used. The portion of the variable braking section 307 that contacts the shaft 305 (or the rotation transmitting means) of the winding body 301 is made of a well-known material used for a brake band, a brake shoe, a brake lining, or the like, or leather. Can be used.

The weight sensitive part 308 has one end supported by the support 304. Then, the other end of the pressure generating section 308 presses the variable braking action section 307. This pressure generating section 3
08 is preferably configured using a compression spring. When a compression spring is used, the entire length of the compression spring changes depending on the weight of the winding body 301. When the weight of the winding body 301 is large, the total length of the compression spring is shortened in accordance with the weight, and
The position of No. 5 is displaced and lowered. Then, the variable braking section 307 increases the contact area so as to wind around the shaft 305 (or the rotation transmitting means) of the winding body 301, and applies a large braking torque to the shaft 305 according to the displacement of the position of the shaft 305. .

On the other hand, when the weight of the winding body 401 is small, the total length of the compression spring becomes long according to the weight, and a small braking torque corresponding to the displacement of the position of the shaft 305 is also applied to the shaft 3.
Acts on 05. As described above, since the braking force automatically changes according to the weight of the winding body 301, appropriate braking can always be applied to the winding body 301 from the start to the end of web supply. FIG. 3 is a schematic explanatory view, and details of the configuration are omitted to clarify the features of the present invention. As in the case of FIG. 2, it is obvious that it should be provided, and parts that can be configured by known techniques are omitted.

As described above, the present invention has been described based on the embodiments. However, the present invention is not limited to the above, and can be implemented in various forms based on the technical idea of the present invention. Needless to say, they are also included in the present invention. For example, in the above, an example is described in which the web supply device of the present invention uses only either the outer peripheral surface braking means or the weight-sensitive shaft braking means. However, it goes without saying that the conventional braking device and the braking device of the present invention can be used together. By using them together, the braking operation is shared by the respective braking devices, so that the reliability is high and reliable, and each braking device only needs to have the braking performance corresponding to the sharing. It is easy to achieve miniaturization. Further, when improving the existing web supply device, the braking device according to the present invention can be added while leaving the existing conventional braking device. Thereby, the improvement can be easily performed, and the existing device is not wasted.

When the braking device according to the present invention is used in combination with the braking device capable of mechanically setting the braking strength on the shaft of the winding body described in the prior art, it can be used as follows. . For example, the conventional brake device is set so that an appropriate braking strength can be obtained when the outer diameter of the winding body is small. When the outer diameter is large, the braking device according to the present invention works at the same time, so that an appropriate braking strength is obtained. Then, as the outer diameter of the winding body becomes smaller, the compression or tension of the spring is reduced to zero in the braking device of the present invention at a middle outer diameter. At that time, the braking intensity of the braking device according to the present invention also becomes zero. After that, only the braking force by the conventional braking device is applied.

[0027]

As described above, according to the present invention having the outer peripheral surface braking means, there is provided a controllable braking mechanism for generating an appropriate braking torque according to the magnitude of the outer diameter of the winding body, Moreover, a simple and compact web supply device is provided.
Further, according to the present invention, in which the outer peripheral surface braking means has the braking action portion and the pressing generation portion, the braking force can be changed widely by design or adjustment. Further, according to the present invention in which the pressing portion is a compression spring or a tension spring, the braking mechanism can be made extremely simple and small. Further, according to the present invention having the weight-sensitive shaft braking means, a simple and small-sized web supply device having a controllable braking mechanism for generating an appropriate braking torque according to the magnitude of the outer diameter of the winding body. Is provided. Further, according to the present invention, in which the weight-sensitive shaft braking means has the weight-sensitive portion and the variable braking action portion, the braking force can be widely changed by the design or adjustment thereof. Further, according to the present invention in which the weight sensitive portion is a compression spring, the braking mechanism can be made extremely simple and small. Further, according to the present invention, the variable braking action portion changes the area of the friction portion acting on the shaft of the web winding member or the peripheral surface of the member fixed to the shaft in accordance with the displacement of the weight sensing portion. Can be extremely simple and small.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a web supply device (Example 1) of the present invention.

FIG. 2 is an explanatory diagram of a web supply device (Example 2) of the present invention.

FIG. 2 is an explanatory diagram of a web supply device (Example 3) of the present invention.

[Explanation of symbols]

 101, 201, 301 Winding body 102, 202, 302 Web 103, 203, 303 Frame 104, 204, 304 Post 105, 205 Bearing 106, 206 Outer surface braking means 107, 207 Braking action part 108, 208 Press generation part 205 Shaft 206 Weight-sensitive shaft braking means 207 Variable braking action section 208 Weight-sensitive section

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[Procedure amendment]

[Submission date] December 19, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a web supply device (Example 1) of the present invention.

FIG. 2 is an explanatory diagram of a web supply device (Example 2) of the present invention.

FIG. 3 is an explanatory diagram of a web supply device (Example 3) of the present invention.

DESCRIPTION OF SYMBOLS 101, 201, 301 Winding bodies 102, 202, 302 Webs 103, 203, 303 Frames 104, 204, 304 Posts 105, 205 Bearings 106, 206 Outer peripheral surface braking means 107, 207 Braking action part 108, 208 Press generation unit 205 Shaft 206 Weight sensitive shaft braking means 207 Variable braking action unit 208 Weight sensitive unit

Claims (7)

[Claims] 1. A web supply device for supplying a web by rewinding it from a web take-up body, comprising an outer peripheral surface braking means for applying a braking force to an outer peripheral surface of the web take-up body to be unwound. A web supply device characterized by the following. 2. The outer peripheral surface braking means has a braking action portion and a pressure generating portion, wherein the braking action portion contacts the outer peripheral surface of the web winding body to apply a braking force, and 2. The web supply device according to claim 1, wherein one end is supported by a frame that rotatably supports the web winding body around its axis, and the other end presses the braking action portion. 3. The web supply device according to claim 2, wherein said pressing portion is a compression spring or a tension spring. 4. A web supply device for supplying a web by rewinding the web from a web take-up body, wherein a braking torque corresponding to the weight of the web take-up body to be unwound is applied to a shaft of the web take-up body. A web supply device, comprising: a weight-sensitive shaft braking means. 5. The weight-sensitive shaft braking means has a weight-sensitive part and a variable braking part, and the weight-sensitive part changes the mechanical displacement according to the weight of the web winding body. The variable braking action portion applies a braking torque according to the displacement to a shaft of a web take-up body.
A web feeder as described. 6. The web supply device according to claim 5, wherein said weight sensitive portion is a compression spring. 7. The variable braking action portion changes the area of a friction portion acting on the shaft of a web winding member or a peripheral surface of a member fixed to the shaft in accordance with the displacement of the weight sensing portion. The web supply device according to claim 5 or 6, wherein