JP3624888B2 - Filament winding equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a filament winding apparatus, and more particularly to a technique for holding a yarn at the start or end of winding around a mandrel.
[0002]
[Prior art]
Conventionally, there is a filament winding method as a method of manufacturing a tube made of FRP (fiber reinforced plastic). In this filament winding method, both ends of a cylindrical mandrel that serves as a mandrel are rotatably supported by a chuck mechanism, and a fiber layer is formed by winding a thread impregnated with resin around the mandrel while rotating the mandrel. To do. Thereafter, the mandrel with the fiber layer formed is removed from the chuck mechanism and the resin is cured in a heating furnace, and then the mandrel is extracted from the cylindrical fiber layer to obtain a cylindrical FRP product.
[0003]
[Problems to be solved by the invention]
However, in the apparatus for performing the conventional filament winding method, when the yarn starts to be wound around the mandrel, the end of the yarn is manually fixed at a predetermined position, and at the end of the yarn winding, the yarn is wound. After cutting, the thread was manually clamped in place while the mandrel was replaced. For this reason, in order to improve working efficiency, there has been a demand for automating the yarn winding start and winding end processes. As an example of such automation, there is a technique in which a dedicated gripping mechanism is provided and a part of the thread is gripped by the gripping mechanism at the start and end of winding of the thread around the mandrel. However, it is often difficult to simplify the structure of such a gripping mechanism.
[0004]
In view of the above-described conventional problems, an object of the present invention is to provide a filament winding apparatus that can automate the process of starting and ending winding of a yarn around a mandrel with a simple mechanism.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is a filament winding device for winding a thread around a mandrel, wherein the mandrel is rotatably supported and a driving shaft is transmitted to the mandrel, A winding sleeve that is coaxially arranged on the outer periphery and is provided so as to be rotatable relative to the drive shaft, and stores the yarn at the start or end of winding of the yarn around the mandrel, the mandrel and the winding A feeding head that traverses along the sleeve for supplying the yarn, and engages with the winding sleeve, and allows only rotation of the winding sleeve in the winding direction, and rotates in the unwinding direction. Rotation restricting means for restricting and driving force transmitting means for transmitting a driving force synchronous with the mandrel to the winding sleeve.
[0006]
Preferably, the driving force transmission means is provided on the mandrel and the winding sleeve, respectively, and transmits the driving force using the tension of the yarn wound around the mandrel and the winding sleeve. A pair of pin rows to be performed is provided. Preferably, the filament winding apparatus further includes a cutter for cutting the yarn while the supply head supplies the yarn to the winding sleeve at the end of the winding, and the cutter includes the pair of cutters. Cut the yarn part between the pin rows.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a view showing a periphery of a winding portion in a filament winding apparatus according to an embodiment of the present invention. The filament winding apparatus may be the same as the structure of the existing filament winding apparatus except for the structure described below. The filament winding apparatus 1 includes a relay shaft 3 as a drive shaft that transmits torque to the mandrel M. In FIG. 1, the right end portion of the relay shaft 3 is connected to a drive motor (not shown), whereby the relay shaft 3 rotates. The right end portion of the mandrel M is connected to the left end portion of the relay shaft 3 in FIG. The left end portion of the relay shaft 3, that is, the end portion 3a on the mandrel side, is formed to have a larger diameter than the other portion of the relay shaft 3, that is, the main body portion 3b. A hole having a predetermined depth from the left end surface is formed in the mandrel side end 3a. The right end Ma of the mandrel M is inserted into this hole. The relay shaft 3 and the mandrel M are connected in a torque transmission relationship by a pin 5 penetrating both the mandrel side end portion 3a of the relay shaft 3 and the right end portion Ma of the mandrel M at a portion where both overlap in the longitudinal direction. ing. Further, the right end portion Ma of the mandrel M is formed with a smaller diameter than the main body portion Mb. Note that the connection structure between the mandrel M and the drive shaft is not limited to the above structure, and may be another structure in which a torque transmission is possible, for example, using a chuck mechanism.
[0008]
A thread cutting assisting portion 7 is provided on the outer peripheral surface of the mandrel side end portion 3 a of the relay shaft 3. The yarn cutting and supplementing unit 7 includes a pair of hook-shaped portions 7 a and 7 b that are separated by a predetermined distance in the longitudinal direction of the relay shaft 3. Further, a cutter 9 is provided substantially vertically above the yarn cutting and supplementing unit 7 so as to be movable up and down. The cutter 9 is lowered when the yarn needs to be cut, and cuts the portion of the yarn between the pair of hooks 7a and 7b. In other cases, the cutter 9 is sufficiently separated from the yarn cutting and supplementing portion 7. Has been raised to position.
[0009]
A winding sleeve 11 is disposed on the outer periphery of the main body 3 b of the relay shaft 3. The winding sleeve 11 is a cylindrical member, and is supported so as to be relatively rotatable with respect to the relay shaft 3 by a pair of bearings 13a and 13b disposed inside both ends of the sleeve.
[0010]
A pin row 15 composed of a plurality of pins is provided on the outer periphery of the end portion on the mandrel side of the winding sleeve 11. The pins of the pin array 15 are arranged on a surface substantially orthogonal to the axis of the winding sleeve 11 and are arranged radially away from the outer peripheral surface of the winding sleeve 11 at an equal angle. ing. A pin row 17 similar to the pin row 15 is also provided at the end of the mandrel M on the body sleeve Mb on the winding sleeve side.
[0011]
A one-way clutch 19 as a rotation restricting means that allows the winding sleeve 11 to rotate only in one direction (winding direction described later) is provided on the outer periphery of the end of the winding sleeve 11 on the side opposite to the mandrel. Has been placed. The one-way clutch 19 is fixed at a predetermined position by an appropriate bracket 21 and supports the end of the winding sleeve 11.
[0012]
Further, in the vicinity of the mandrel M and the winding sleeve 11, there is provided a yarn supply head 23 that can be traversed along the longitudinal direction thereof. The supply head 23 supplies the yarn from a supply device (not shown) to the mandrel M or the winding sleeve 11 while traversing.
[0013]
Next, the operation of the filament winding apparatus including the winding portion peripheral structure configured as described above will be described. In this embodiment, the case where the winding of the yarn impregnated with the resin is finished and the dry yarn not impregnated from above is wound is applied to the process from the start to the end of winding. Therefore, the mandrel M shown in FIG. 2 is already wound with a yarn impregnated with resin, and the winding of the impregnated yarn starts from the left end (not shown) of the mandrel M and is also wound at the left end. It shall end. The dry yarn is wound on the impregnated yarn from the right end of the mandrel M, and is similarly wound at the right end.
[0014]
As shown in the first state of FIG. 2, the winding sleeve 11 is wound with the dry yarn T after the completion of the winding of the dry yarn around the previous mandrel M, and the supply head 23 is used for winding. Waiting in the vicinity of the sleeve 11 (standby state). That is, at the start of winding, the dry yarn T is held by the sleeve 11 for winding. From this state, as shown in the second state of FIG. 2, the supply head 23 is traversed toward the body portion Mb of the mandrel M through the pin row 15, the yarn cutting assisting portion 7, and the pin row 17. At this time, the relay shaft 3 and the mandrel M connected thereto are rotated in the direction of the arrow in FIG. 2 by the driving force of a driving motor (not shown). On the other hand, the driving force of the relay shaft 3 is not directly transmitted to the winding sleeve 11 due to the presence of the bearings 13a and 13b. When the supply head 23 is traversed to the main body Mb of the mandrel M as in the second state of FIG. 2, the dry yarn T is caught by both the pin row 15 and the pin row 17, and the mandrel from the relay shaft 3. The driving force transmitted to M and the pin row 17 is also transmitted to the pin row 15 and the winding sleeve 11 via the dry thread T hooked on the pin rows 15 and 17. That is, the pin rows 15 and 17 function as driving force transmission means for transmitting the driving force of the mandrel M to the sleeve 11 for winding. As a result, the winding sleeve 11 rotates synchronously with the relay shaft 3 and the mandrel M. At this time, since the one-way clutch 19 allows the winding sleeve 11 to rotate only in the winding direction of the yarn, the one-way clutch 19 prevents the winding sleeve 11 from rotating with the mandrel M. (See FIG. 3).
[0015]
From the second state of FIG. 2, the supply head 23 reciprocates between the right end and the left end of the main body Mb of the mandrel M as many times as necessary, and uses the rotation of the mandrel M to supply a necessary amount of dry yarn T. Wrap it around the main body Mb. When the required amount of the supply head 23 is wound around the main body Mb of the mandrel M, the supply head 23 passes through the pin row 17, the yarn cutting assisting portion 7, and the pin row 15 and is wound as shown in the third state of FIG. Therefore, the traverse is performed to the vicinity of the sleeve 11 for use. At this time, since the winding sleeve 11 rotates in synchronization with the mandrel M, the thread T supplied from the supply head 23 is spirally formed on the winding sleeve 11 in the same manner as the winding around the mandrel M. Wrapped around.
[0016]
Thereafter, as shown in the fourth state in FIG. 2, the cutter 9 is lowered, and the portion of the yarn T between the pair of hook-like portions 7 a and 7 b in the yarn cutting auxiliary portion 7 is cut. The cut end portion Ta of the thread T on the mandrel M side moves together with the mandrel M when the mandrel M is removed from the chuck mechanism and transported to the next processing step. On the other hand, the end portion Tb of the thread T on the side of the wound winding sleeve 11 is covered with the thread already wound around the winding sleeve 11 so that it cannot be unwound further. Further, after the cutting, an appropriate tension is applied to the dry yarn T supplied to the side of the sleeve 11 for winding from the supply head 23, while torque is transmitted by the yarn between the pin rows 15 and 17 by the cutting. Therefore, as shown in FIG. 3, a torque in the yarn unwinding direction acts on the winding sleeve 11. However, since the winding sleeve 11 is allowed to rotate only in the winding direction by the one-way clutch 19, the winding sleeve 11 rotates in the unwinding direction due to the tension of the yarn even after cutting. Is prevented, and the yarn on the sleeve 11 for winding in the standby state (from the fourth state to the first state in FIG. 2) is prevented from loosening. In this way, even at the end of winding, the dry yarn T is held with a suitable tension on the sleeve 11 for winding (standby state).
[0017]
As soon as the preparation of a new mandrel M is completed after the fourth state of FIG. 2, the next winding operation can be performed from the first state of FIG. 2, and the yarn is also in the standby state as described above. Since it is held without slack, the process of starting and finishing winding of the yarn can be automated. Such automation is realized by a simple mechanism that requires only the same operation as a normal yarn winding operation of rotating the mandrel M and traversing the supply head 23 without installing a special yarn gripping mechanism. The Further, the mandrel M can be rotated through the relay shaft 3 during the standby state in which the yarn from the winding sleeve 11 is prevented from being unwound and the yarn tension is appropriately maintained. It is also possible to rotate the mandrel M and wind another yarn from another supply head while the winding is waiting.
[0018]
The present invention described above is not limited to the above-described embodiment, and can be appropriately modified. That is, the yarn winding process to be automated is not limited to dry yarn that has not been impregnated, and can also be applied to automation of the winding process of the impregnated yarn.
[0019]
【The invention's effect】
As described above, according to the filament winding apparatus of the present invention, the yarn can be held without being loosened even in the standby state, and the yarn winding start and winding end steps can be automated. In addition, such automation can be realized by a simple mechanism that requires only the same operation as a normal yarn winding operation without installing a special yarn gripping mechanism.
[Brief description of the drawings]
FIG. 1 is a side view showing a periphery of a winding sleeve in a filament winding apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a winding operation in the filament winding apparatus according to the embodiment of the present invention.
FIG. 3 is a view illustrating a winding sleeve as viewed from line III-III in FIG. 2 and illustrating a rotation condition of the sleeve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Filament winding apparatus, 3 ... Relay shaft (drive shaft), 9 ... Cutter, 11 ... Sleeve for winding, 15, 17 ... Pin row (drive force transmission means), 19 ... One-way clutch (rotation restriction means), 23 ... feed head, M ... mandrel.

Claims (4)

A filament winding device for winding a thread around a mandrel,
A driving shaft that rotatably supports the mandrel and transmits a driving force to the mandrel;
A winding sleeve that is coaxially disposed on the outer periphery of the drive shaft and is provided so as to be relatively rotatable with the drive shaft, and stores the yarn wound around the mandrel at the start or end of winding of the yarn;
A supply head that traverses along the mandrel and the winding sleeve to supply the yarn;
A rotation restricting means that engages with the winding sleeve, allows only rotation of the winding sleeve in the winding direction, and restricts rotation in the unwinding direction;
Driving force transmitting means for transmitting a driving force synchronous with the mandrel to the winding sleeve;
Filament winding device equipped with. The driving force transmitting means is a pair of pins provided on the mandrel and the winding sleeve, respectively, for transmitting the driving force using the tension of the yarn wound around the mandrel and the winding sleeve. The filament winding apparatus according to claim 1, comprising a row. 3. The filament winding apparatus according to claim 1, further comprising a cutter that cuts the yarn while the supply head is supplying the yarn to the winding sleeve at the end of the winding. The filament winding apparatus according to claim 3, wherein the cutter cuts a yarn portion between the pair of pin rows.

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