JP3988746B2 - Molding method and molding apparatus for inserts - Google Patents

Description

  The present invention relates to a method and apparatus for forming a cylindrical insert using a tape-like insert material such as a mesh tape as a raw material.

Conventionally, a ribbon supply device and a welding / cutting device have been installed on the lower side of a movable table that can be moved laterally, and the movable table is moved down to the upper part of the core mold. The ribbon guide is moved backward, the ribbon is hooked directly onto the core, the ribbon is sandwiched between the horn and holder, wound around the core, and then welded and melted to form a cylindrical insert around the core. ing.
Japanese Examined Patent Publication No. 4-66165

  In this prior art, the ribbon drawing by the forward movement of the ribbon guide and the hooking of the ribbon by the backward movement and the subsequent welding / cutting are continuously performed for each of the plurality of rows of cores. It is necessary to shift the position of the fusing part to the winding side. This position shift is performed by pulling the tension roller on the winding side and winding the remaining ribbon. However, if the winding amount is small, the fusing portion winds around the core, and a plurality of side surfaces of the formed inserts are wound. A weld edge is formed, resulting in a molding failure. Further, when the winding amount is increased, the yield of the insert material is deteriorated and the cost is increased.

  In addition, the remaining ribbon is in a state where it is long connected to the melted part generated every time and is in a state of being easily stretched and contracted. In some cases, this may affect the withdrawal of the tape so that the ribbon cannot be supplied stably. Furthermore, because the insert is molded by winding the ribbon around the core of the core mold, the position of the welding edge relative to the core is determined at a certain location, and the position cannot be changed, so depending on the structure of the insert molded product There is also a problem that it cannot be adopted.

  The present invention has been conceived in order to solve the above-described conventional problems. The purpose of the present invention is to always supply a set amount of material tape by adopting a supply means for pulling out and supplying the material tape on the supply reel side. It is another object of the present invention to provide a new insert molding method and molding apparatus for preventing double welding in an insert by moving the tape fusing trace to the winding side away from the molding core.

  In addition, the present invention adopts a molding core for molding of the insert, and allows the insert to be transferred together with the molding core, so that the insert can be continuously formed from the material tape to the core of the molding machine. Another object of the present invention is to provide a new insert molding method and molding apparatus that can easily change the position of the welded edge of the insert relative to the core mold.

According to the present invention, the supply reel and the take-up reel are arranged on both sides of the support head, and the material tape stretched over the support head and stretched from the supply reel to the take-up reel is formed with the forming core and the support head. When the cylindrical insert is formed by drawing out from the support head and winding it around the core side surface by welding and cutting the surplus portion by relative movement with
The supply of the material tape is the length of the material tape drawn from the support head, and the length of the fusing trace that occurred on the material tape in the previous molding is located on the winding side from the welding / melting site of the next molding. The added dimension is used as a measurement value.

  The material tape is supplied in a state in which the material tape is tensioned from the winding side, the material tape on the supply side is sandwiched and the measured value is drawn from the supply reel, and the material tape corresponding to the measured value is attached to the material tape. After temporarily winding on the take-up reel and feeding it to the take-up side, pull the material tape to the supply reel side, apply tension, and pull out the measured value on the take-up side from the support head with the above molding core, The insert is molded by fusing.

  The tension of the material tape on the supply side is applied to the material tape with a tension that balances with the tension from the winding side by means of clamping and moving at the pulling position on the supply side, and from both the supply side and the winding side. The slack of the material tape is suppressed by the tension of the material, the excess length of the material tape wound around the core side surface of the molding core is welded and melted, and the tension on the supply side is released after the melting. The tensioning of the material tape is performed by a weight load that pulls the holding and moving means in the direction of the supply reel.

  The forming apparatus of the present invention also includes a supply reel disposed on both sides of the support head and a take-up reel having take-up power, a material tape provided on the support head and stretched from the supply reel to the take-up reel, and a support A welding / cutting means provided at the tip of the head, a molding core for pulling the material tape from the support head and winding it on the side of the core, and a grip for the material tape provided on the supply reel side from the support head, the grip and the support head Between the measuring means on the movable plate that reciprocates the clamping movement means of the material tape, the tensioning weight suspended on the supply reel side of the movable plate, and the weight of the weight supporting the movable plate A metering supply means comprising a means for switching the tension of the material tape to no tension is provided.

In the molding method of the present invention, the supply reel and the take-up reel are arranged on both sides of the support head, and the material tape stretched over the support head and stretched from the supply reel to the take-up reel is supported by the molding core. Pull out from the head and wind it around the side of the core, and weld and cut the extra length to form a cylindrical insert.
The molding core is made to stand by inside the support head, the molding core is moved to a position beyond the welding / cutting means at the tip of the support head, the material tape is hooked on the side of the core and pulled out from the support head, and the welding / melting means Is welded and cut by sandwiching both side tapes near the core to form a cylindrical insert with a welding edge vertically around the core, and the insert is placed directly above the in-core of the core of the molding machine together with the molding core. And the insert is removed from the molded core to the in-core.

  The number of molding cores is the same as the number of core molds. The insert is removed from the molded core to the in-core by a pressing member provided at the top.

  The insertion of the insert from the molded core to the in-core is performed after the molded core is rotated to an arbitrary angle and the position of the welding edge generated on the side surface of the insert is changed.

In the above configuration, since the supply of the material tape is performed on the supply reel side, the set amount can be always supplied without being affected by the elastic force of the remaining tape on the winding side, so that stable supply is possible and surplus supply is also possible. It is prevented and the yield is improved.
In addition, since the material tape can be pulled out and the cylindrical insert can be molded by the molding core, it is possible to perform molding continuously in multiple rows of molding cores by moving the molding core and alternately operating the welding and fusing devices. Since the insert can be moved as it is after the insert is molded and inserted into a plurality of rows of in-cores, the efficiency of insert molding is improved. Further, since the position of the welding mark can be shifted to the winding side away from the molding core, it also prevents molding defects due to double welding.

  In the figure, reference numeral 1 denotes a vertical injection molding machine, which includes a rotary transfer disk 3 on the upper surface of the bed 2, and a required number of injection cores (hereinafter referred to as in-cores) on the mold clamping device 4 side of the rotary transfer disk 3 and its symmetrical position. The core die 5 is affixed and fixed in series with a radial projection 5a.

  6 is an insert molding apparatus capable of simultaneously forming and cutting the material tape 7 into a cylindrical shape and supplying it to the in-core 5a of the core mold 5 by connecting the bed 8 to the molding machine bed 2, The core mold 5 is disposed on the front side of the injection molding machine 1 where it stops. The material tape 7 is a mesh tape in which fibers such as nylon and polyester are knitted with a rough or mesh pattern, and is used as a filter material or the like.

  The insert molding apparatus 6 includes a material tape supply device 9 installed on a bed 8, a welding / cutting device 10 disposed between the material tape supply device 9 and the core mold 5, and a material tape supply device. 9 and an insert loader 11 that reciprocates between the upper part of the core mold 5, and the same number as the plurality of in-cores 5 a protruding upward from the core mold 5 on the molding machine side below the insert loader 11. Molded core 12 is mounted downward with the same in-core spacing. The diameter of the molded core 12 is slightly larger than the diameter of the in-core 5a.

  The material tape supply device 9 includes a support head 13 provided with a center line A-A positioned on an extension line of the in-core row of the core mold 5, supply reels 14 provided on both sides of the support head 13, It comprises a take-up reel 15 having rotational power, and a metering and feeding device 16 for the material tape 7 provided between the support head 13 and the supply reel 14, and these are a seat plate 18 provided in two stages on the base plate 17. , 18a and placed and fixed on the bed 9 (see FIG. 4).

  The support head 13 is composed of a pair of guide plates 13a, 13a that are inclined inwardly on the outer side surface of the front end portion with a required interval, and is provided outside the rear ends of both guide plates 13a, 13a. With the guide rollers 13b and 13b, the material tape 7 taken up by the take-up reel 15 from the horizontally rotating supply reel 14 is held vertically over the leading ends of both guide plates 13a and 13a and guided to the take-up reel 15. .

  The supply reel 14 is non-powered, and the set amount of the material tape 7 is pulled out from the supply reel 14 by a tensile force applied to itself. Further, a rotational force is always applied to the take-up reel 15 in the take-up direction, whereby the material tape 7 is pulled moderately lightly from the take-up side and is tensioned.

  The metering supply device 16 for the material tape 7 sandwiches the guide member 19 standing on the support head 13 side, the spring grip 20 standing on the supply reel 14 side, and the material tape 7 supported vertically by both members. A chuck device 21 that reciprocates the chuck device 21, and a measuring cylinder 22 that draws a certain amount of the material tape 7 from the supply reel 14, and a tension switching cylinder 23 of the material tape 7 provided on the side of the measuring cylinder 22. It consists of. The spring grip 20 maintains the tension of the material tape 7 drawn from the supply reel 14.

  Although not shown in the drawing, the measuring cylinder 22 has a structure in which the cylinder side moves, and is movably fitted to a linear guide rail (not shown) laid on the seat plate 18 along the material tape 7. The opening / closing device 21a of the chuck device 21 is mounted on the movable plate 24, and the chuck device 21 can be reciprocated together with the opening / closing device 21a. Note that an air cylinder or an electromagnetic switch with a return spring incorporated therein can be adopted as the switching device 21a.

  A weight 25 is suspended from the end of the movable plate 24 on the supply reel side. The movable plate 24 is always pulled together with the chuck device 21 and the measuring cylinder 22 by the load of the weight 25, and the material tape 7 is tensioned with the tension from the take-up side by clamping. The tensile force at this time can be arbitrarily set by changing the mass (for example, 500 g) of the weight 25 according to the tension from the winding side.

  The tension switching cylinder 23 cancels the tensile force acting on the movable plate 24 so that the tension due to the load of the weight 25 is not applied to the material tape 7 even when the chuck device 21 holds the material tape 7. Is provided on the seat plate 18 in parallel with the movable plate 24, and the piston rod 23a is inserted into the arm portion 24a projecting from the side of the movable plate 24, and the arm portion 24a is connected to the periphery of the rod. The flange 23b is abutted so as to be able to contact and separate.

  The welding / cutting device 10 includes a horn driving device 30 and an anvil driving device 31. Both of the driving devices are fitted to a linear guide 33 laid on the pedestal 32 so as to be able to move forward and backward, a support member 35 erected on the front end of the pedestal 34a on the upper surface of the moving plate 34, A moving cylinder 38 provided over the pedestal 32 and the rear end portion of the moving plate 34 has the same structure, and a welding horn 36 and an anvil 37 are attached to the same height position of the support member 35.

  The horn driving device 30 and the anvil driving device 31 are arranged so that the tips of the horn 36 and the anvil 37 are in contact with each other on the center line AA of the support head 13 at right angles to the center line and the support head 13. A required drawing space 39 is provided between the support head 13 and the both ends of the support head 13.

  The insert loader 11 has a long length provided on the inner surface of the loader support 40 so that the core row of the molded core 12 provided on the lower side is positioned on the center line AA of the support head 13. It is provided at the inner front end portion of the sliding disc body 41. The loader support 40 is attached to a column 42 standing on the base plate 17 on the take-up reel 15 side, and is composed of a horizontally long frame provided toward the injection molding machine 1. The sliding platen 41 is moved laterally by the means, and the insert loader 11 is reciprocated between the inside of the support head 13 and the upper part of the core 5 of the core.

  As shown in FIG. 5, the sliding disc body 41 is provided on the loader support 40 by being fitted to a holding member 43 and a linear guide 44 that are provided on the inner surface of the loader support 40. The base plate 45 of the insert loader 11 is connected to the piston rod 46a of the elevating cylinder 46 fixed to the upper portion of the sliding disc body 41 on the board surface of the sliding disc body 41, and by a linear guide 47 provided vertically on the board surface. It is mounted so that it can be moved vertically.

  A fixed plate 49 having a support plate 48 horizontally at the lower end is integrally attached to the base plate 45 in contact with the plate surface, and a plurality of cylindrical core support members 50 are attached to the support plate 48 at predetermined intervals. It is provided so as to be able to rotate by being inserted into. The molding core 12 is attached downward to the center of the lower surface of the molding core support member 50, and a pressing member 51 for removing the insert 70 around the core to the in-core 5 a of the core mold 5 at the top of the molding core 12. It is inserted.

  The pressing member 51 is formed by bending a plurality of pressing pieces 51b at predetermined intervals at the lower end of a plate body 51a that is provided through the support plate 48 so as to be movable up and down on the base plate 45. The formed insertion groove is inserted into the molding core 12, and the insert 70 can be pushed down to the lower end of the core by the pressing piece 51b.

  A piston rod 52a of an elevating cylinder 52 fixed to the upper end of the base plate 45 is connected to the upper end of the plate body 51a, and the pressing member 51 is vertically provided on the plate surface of the fixed plate 49 on the base side by the elevating cylinder 52. Guided by the linear guide 53, it moves up and down vertically.

  A pinion 54 is concentrically attached to the upper end portion of the pin support member 50. The pinion 54 meshes with a horizontally long rack 57 that moves forward and backward by a cylinder 56 fixed to the outside of the frame 55, and the pin 57 rotates the pin support member 50 together with the molding core 12 by the rack 57. Thereby, the position of the welding edge 70a of the insert 70 can be changed by 90 °.

  Next, the supply process of the material tape 7, the forming of the cylindrical insert 70 as shown in FIG. The cylinder operation of the insert molding supply device 6 is entirely driven by air, but in some cases, a hydraulically driven cylinder may be employed.

  First, the material tape 7 having a required width (for example, 12 mm) is pulled out from the supply reel 14 and passed through the spring grip 20, the chuck member 21 at the retracted position, and the guide member 19 in this order, and a pair of guide plates 13 a and 13 a of the support head 13. And is connected to a cardboard take-up ring (not shown) fitted to the take-up reel 15. Next, the take-up reel 15 is rotated at a low speed counterclockwise by power, the tape 7a remaining on the take-up side is always pulled, and the material tape 7 is tensioned. When the remaining tape side is pulled without slack with the support head 13 by this tension, and when the tension is applied strongly and the tensile resistance increases, the winding ring in the reel slips, so that the material tape 7 is pulled from the winding side. Appropriate tension is always applied.

  After the material tape 7 is set, the insert loader 11 is moved to the upper part of the material tape supply device 9, and the molding core 12 passes between the guide plates 13a, 13a opposite to the support head 13. The entire loader is lowered by the elevating cylinder 46 up to this position, and the leading molding core 12 is positioned inside the material tape 7 that spans the guide plate. In some cases, it may be positioned before the tape set.

  After such preparation, the tension switching cylinder 23 is moved forward (right side in the figure), and the movable plate 24 is supported by the piston rod 23a so that the tensile force due to the load of the weight 25 is not applied to the chuck device 21. The chuck device 21 is closed, the material tape 7 tensioned by the take-up reel 15 is clamped, the measuring cylinder 22 is advanced, and the spring grip 20 holding the material tape 7 is moved. Stronger than the gripping force, the material tape 7 is pulled in the direction of the support head 13. The material tape 7 slips on the spring grip 20, is pulled out from the supply reel 14 by a dimension equal to the moving distance of the chuck device 21, is pulled without being loosened by the tension on the take-up side, and is measured by the take-up reel 15. The remaining tape 7a is fed to the winding side by temporary winding.

  The moving distance of the chuck device 21 is set in advance according to the drawing dimension of the material tape 7. This pull-out dimension is the length (for example, 20 mm) of the material tape 7 drawn from the support head 13 and the fusing trace 7b (see FIG. 10) generated in the material tape 7 in the previous molding is determined from the welding / melting site of the next molding. Also, it is a dimension (for example, 1 to 3 mm) including a length located on the winding side, which is a measured value.

  Next, when the chuck device 21 moves the set distance, the advance operation of the measuring cylinder 22 is stopped, the tension switching cylinder 23 is moved backward (left side in the figure), and the support of the movable plate 24 by the piston rod 23a is released. . With this release, the load of the weight 25 acts on the chuck device 21 in the clamped state, and a tension that balances with the tension from the winding side is applied to the material tape 7.

  Following this weighing operation, the insert loader 11 is moved forward (right side in the figure). The forward movement stops when the rear side surface of the leading molding core 12 exceeds the abutting position between the horn 36 and the anvil 37 ahead of the support head 13. As the insert loader 11 moves forward, the molding core 12 hooks the portion of the material tape 7 that is stretched over the support head 13 as shown in the left drawing of FIG. Pull out. The next molding core 12 ′ is located in the support head 13.

  After the insert loader 11 is stopped at the forward position, the horn drive device 30 and the cylinder 38 of the anvil drive device 31 are moved forward. As a result, the horn 36 and the anvil 37 move forward with each other and, as shown in the right side of FIG. 9A, are pressed without slack by the tension from both the supply side and the take-up side and pulled out from the support head 13. The tape on both sides near the core of the material tape 7 is sandwiched, and the material tape 7 is wound around the core. Thereafter, the horn 36 is vibrated at a high frequency to weld the sandwiched portion.

  Since the material tape 7 sandwiched between the chuck devices 21 is tensioned by the load of the weight 25, the portion where welding is most advanced by the tension is as shown in the left diagram of FIG. 9B. The insert 70 (see FIG. 11) that is cut off from the molding core 12 and that has a cylindrical shape and has a welding edge 70a on the side surface remains around the molding core 12. After this fusing, the tension switching cylinder 23 is switched to the forward operation (right side in the figure). The piston rod 23a advances and supports the movable plate 24 again by the contact of the flange 23b, so that the weight of the weight 25 is received by the piston rod 23a so that the material tape 7 is not tensioned by the load.

  The fusing timing tends to occur faster as the mass of the weight 25 increases. Since the welding time is short in the early fusing, the strength of the welding edge 70a is weak. If it becomes lighter, it takes time for fusing, resulting in excessive welding, and the finished state of the welding edge 70a is deteriorated, which tends to cause defective molding. Therefore, it is preferable to adjust the timing of fusing with the mass of the weight 25.

  When the supply-side tension is released after the material tape 7 is melted, an appropriate tension due to the rotation of the take-up reel 15 is always applied to the take-up side of the material tape 7. The portion left after being pulled out is immediately pulled to the winding side. The length of the tensile tape is taken up on the take-up reel 15 as the remaining tape 7a, and the material tape 7 sticks again to the tip of the support head 13 as shown in the right figure of FIG. Located on the take-off side. For this reason, even if welding and fusing are performed on the center line of the support head 13, the fusing marks 7 b do not remain around the pins during the next molding.

  After the insert 70 is formed, the chuck device 21 is opened to release the material tape 7 from being clamped. Further, the horn 36 and the anvil 37 that have stopped the high frequency vibration are moved backward to the original positions. At the same time, the measuring cylinder 22 is moved backward to return the chuck device 21 to the original measuring start position, and the process proceeds to the molding of the insert 70 by the next molding core 12 '.

  The molding core 12 ′ moves together with the molding core 12 and the rear molding core as the insert loader 11 moves forward. The molding core 12 moves forward with the insert molding 70 wound around, and the rear molding core is located in the support head 13. The molded core 12 'draws the material tape 7 from the support head 13, as shown in the left figure of FIG. As shown in the right figure of FIG. 9C, the horn 36 and the anvil 37 weld and cut the material tape 7 to form the insert 70 around the pins of the forming core 12 '. At the time of this molding, the melt mark 7b generated by the previous molding remains on the remaining tape 7a away from the molding core 12 ', so that the insert 70 around the pins of the molding core 12' has the same shape, and two welding edges 70a are formed. There is no heavy formation.

  As shown in FIG. 10, the remaining tape 7a after the inserts 70 are formed on all the forming cores 12, 12 ′,..., Provided in the insert loader 11 are continuously formed by fusing marks 7b at regular intervals. It is in a connected state. The narrower the gap between the fusing marks 7b, the smaller the material loss. The interval can be adjusted by the measured value. In addition, the remaining tape 7a is elasticized by the fusing marks 7b and expands and contracts. However, due to the tension applied by the take-up reel 15, the remaining tape 7a is interposed between the support head 13 and the take-up reel 15. Since the stretched state is in the stretched state, the stretchability of the remaining tape 7a does not hinder the supply of the drawer on the supply reel 14 side, and the metering by the movement of the metering cylinder 22 can always be performed reliably.

  When the molding of the insert 70 is completed, the insert loader 11 is raised to the original height by the elevating cylinder 46 and moved to the upper part of the core mold 5. This movement is stopped at a position where each molded core 12, 12 'is concentric with each in-core 5a of the core mold 5, and the insert loader 11 is held at that position. During this movement or after the movement is stopped, the rack 57 of the pinion 54 is moved forward by the cylinder 56 to rotate the molding core 12 together with the pin support member 50 to an arbitrary angle (for example, 90 °) to weld the side surface of the insert 70. The position of the edge 70a is changed. The change angle varies depending on the design of the insert molded product, and may not be necessary depending on the design.

  Next, the insert loader 11 is lowered from the sliding disc body 41 by the elevating cylinder 46. As shown in FIG. 5B, the lowering is performed until the lower end surface of the molding core 12 is closest to the upper end surface of the in-core 5a. After the descent stop, the pressing member 51 is lowered by the elevating cylinder 52, and the pressing piece 51b formed bent at the lower end of the plate body 51a is pressed against the insert 70 around the pin to be pressed down to the lower end of the core. Refit. Further, the insert 70 is pushed out to a predetermined position, and the insert 70 is removed from the molded core 12 around the in-core.

  After the removal is completed, the insert loader 11 is raised to the original height position by the elevating cylinder 46 and moved to the upper part of the material tape supply device 9. In the injection molding machine 1, the rotary transfer board 3 is rotated 180 °, the core mold 5 is transferred to the mold clamping device 4, and the core mold at the symmetrical position stops at the insert position. Thereafter, in parallel with the injection molding of the insert molded product 80 as shown in FIG. 12, the molding of the insert 70 and the insert operation are started again.

  In the above embodiment, the material tape 7 is pulled out by the movement of the molding core 12 and the molded insert 70 is supplied to the core mold 5, but the molding device 6 is omitted in the figure. Moveable on the machine base, move the support head side with respect to the molding core and pull out the material tape from the support head. After molding the insert as in the above, move the molding core together with the insert to the core mold. Therefore, the forming method of the present invention is not limited to performing drawing of the material tape by moving the forming core.

  Although not shown, the molding core is omitted and the molding apparatus is movably provided on the machine base with respect to the molding machine, the material tape is directly hooked on the incore and pulled out from the support head, and the incore is used as the molding core. Since the insert can also be molded around the core, the molded core in the molding method of the present invention may also serve as a core-type in-core.

1 is a plan view of an insert molding apparatus and an injection molding machine according to the present invention. It is a side view same as the above. It is a top view of a raw material tape supply apparatus. It is a side view same as the above. It is a longitudinal cross-sectional view of the insert loader before the lowering operation (A) and after the lowering operation (B). It is a schematic plan view which shows the supply state of a raw material tape. It is a top view which shows the state of the raw material tape in a support head. It is a side view same as the above. It is a top view which shows supply of a raw material tape in a support head, and a formation process in order. It is explanatory drawing which shows the state of the residual part of a raw material tape. It is a perspective view of an insert thing. It is a perspective view of an insert thing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection molding machine 3 Rotation transfer board 5 Core type | mold 5a In-core 6 Insert supply molding machine 7 Material tape 7a Residual tape 7b Fusing trace 9 Material tape supply apparatus 10 Welding and fusing apparatus 11 Insert loader 12 Molding core 13 Support head 14 Supply Reel 15 Take-up reel 16 Weighing supply device 21 Chuck device 22 Weighing cylinder 23 Tension switching cylinder 24 Movable plate 25 Weight 36 Horn 37 Anvil 41 Sliding disc body 45 Base 46, 52 Lifting cylinder 48 Support member 50 Molding core support member 51 Press Member 51a Pressed piece

Claims (8)

A supply reel and a take-up reel are arranged on both sides of the support head, and a material tape stretched over the support head and stretched from the supply reel to the take-up reel is moved by relative movement between the forming core and the support head. When pulling out from the support head and wrapping around the side of the core, the extra length is welded and cut to form a cylindrical insert,
The supply of the material tape is the length of the material tape drawn from the support head, and the length of the fusing trace that occurred on the material tape in the previous molding is located on the winding side from the welding / melting site of the next molding. A method for forming an insert, wherein the added dimension is used as a measured value. The material tape is supplied in a state in which the material tape is tensioned from the winding side, the material tape on the supply side is sandwiched and the measured value is drawn from the supply reel, and the material tape corresponding to the measured value is attached to the material tape. After temporarily winding on the take-up reel and feeding it to the take-up side, pull the material tape to the supply reel side, apply tension, and pull out the measured value on the take-up side from the support head with the above molding core, The method for molding an insert according to claim 1, wherein the insert is molded by fusing. The tension of the material tape on the supply side is applied to the material tape with a tension that balances with the tension from the winding side by means of clamping and moving at the pulling position on the supply side, and from both the supply side and the winding side. 3. The looseness of the material tape is suppressed by the tension of the material, the extra length of the material tape wound around the core side surface of the molding core is welded and melted, and the supply-side tension is released after the melting. A method for forming the described insert. 4. The method for forming an insert according to claim 3, wherein the tensioning of the material tape on the supply side is performed by a load of a weight that pulls the holding and moving means in the direction of the supply reel. A supply reel disposed on both sides of the support head and a take-up reel having take-up power, a material tape provided on the support head and stretched from the supply reel to the take-up reel, and a welding tape provided on the tip of the support head Fusing means, a molding core that pulls out the material tape from the support head and winds it around the side of the core, and a grip of the material tape provided on the supply reel side from the support head, between the grip and the support head, Weighing means on the movable plate that reciprocates the clamping movement means, a tensioning weight hung on the supply reel side of the movable plate, and the tension of the material tape due to the weight load by supporting the movable plate without tension An apparatus for forming an insert, characterized by comprising a metering means comprising a means for switching. A supply reel and a take-up reel are arranged on both sides of the support head, and a material tape that is hung on the support head and stretched from the supply reel to the take-up reel is pulled out from the support head by a molding core and wound around the core side surface. In forming a cylindrical insert by welding and cutting the surplus part,
The molding core is made to stand by inside the support head, the molding core is moved to a position beyond the welding / cutting means at the tip of the support head, the material tape is hooked on the side of the core and pulled out from the support head, and the welding / melting means Is welded and cut by sandwiching both side tapes near the core to form a cylindrical insert with a welding edge vertically around the core, and the insert is placed directly above the in-core of the core of the molding machine together with the molding core. A method for forming an insert, characterized in that the insert is transferred to and removed from the molding core into the in-core. The number of molding cores is the same as the number of core molds. 7. The method of forming an insert according to claim 6, wherein the insert is removed from the forming core to the in-core by a pressing member provided on the top. 8. The insert according to claim 7, wherein the removal of the insert from the molded core to the in-core is performed after the molded core is rotated to an arbitrary angle and the position of the welding edge formed on the side surface of the insert is changed. Molding method.

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