KR20070086553A - Horizontal rotary hook for sewing machine - Google Patents

Abstract

A horizontal rotary hook for a sewing machine includes an inner bobbin case holder accommodating a bobbin, an outer rotating hook accommodating the bobbin case holder and rotated in a predetermined direction with the bobbin case holder being accommodated in the rotating hook, the rotating hook having an outer peripheral wall formed with a bobbin-thread passing opening through which the bobbin thread passes, an enlarged opening defined in the outer peripheral wall of the rotating hook so as to be continuous to the bobbin-thread passing opening, a beak member separate from the rotating hook and mounted on the rotating hook so as to close the enlarged opening, and a fitting holder mounted on the rotating hook so that a lower part of the beak member is fitted into the fitting holder, thereby holding the beak member.

Description

Horizontal rotary hook for sewing machines {HORIZONTAL ROTARY HOOK FOR SEWING MACHINE}

The disclosure relates to a horizontal rotary hook for a sewing machine comprising an internal bobbin case holder for receiving the bobbin and an external rotary hook for receiving the bobbin case holder with a beak, in particular the rotating hook for the machine. It relates to a horizontal rotary hook which is a component that is separated from it.

Horizontal rotary hooks with easy bobbin exchange have been used in conventional sewing machines. The horizontal rotatable hook includes an outer rotatable hook that is formed from a lace and an inner bobbin case holder that receives the bobbin and is rotatably held relative to the race face. The rotary hook is configured to rotate in a predetermined direction by a sewing machine motor or the like.

Bobbin case holders are made of synthetic resin to reduce weight and production costs. Rotary hooks have also recently been made of synthetic resin. In this case, the beak is provided on the outer circumferential wall of the rotary hook to capture the loop of the bobbin thread. However, if the bee is integrally formed with the rotary hook, the structure of the forming die used to form the rotary hook becomes complicated. The beak also requires higher strength than other parts of the rotary hook. In view of this problem, it has been proposed that a beak member with a bee is formed to be mounted to and detached from the rotatable hook. For example, JP-U-S60-149388 discloses a horizontal rotary hook, mounted on the inner peripheral surface of the outer peripheral wall of the hook such that the beak is made of metal and placed on the inner peripheral surface.

However, the thickness of the portion of the rotary hook on which the beak member rests is increased when the beak member is mounted inside the outer circumferential wall of the rotary hook. As a result, the size of the horizontal rotary hook increases.

In order to be able to limit the increase in the size of the entire horizontal rotary hook, it is proposed that the beak member is placed in the opening formed by cutting the outer circumferential wall of the horizontal rotary hook and mounted to the bottom of the rotary hook by screws to be joined to the rotary hook. do. However, simply mounting the beak member under the rotary hook made of synthetic resin causes the sewing thread to be entangled in the space formed between the inner rotary hook and the beak member. When the thread is entangled, the beak member is subject to large external stresses that move outward momentarily. As a result, the beak member is deformed or a part of the beak member mounted to the outer rotary hook is damaged.

Accordingly, the purpose of the description is to provide a horizontal rotary hook for a sewing machine, wherein the beak member separated from the external rotary hook can be reliably and firmly mounted to the rotary hook even if the thickness of the outer peripheral wall of the rotary hook is not increased. .

In one embodiment, the substrate contents are rotated in a predetermined direction with an internal bobbin case holder for receiving a bobbin therein, and a bobbin case holder for receiving a bobbin case holder and received in a rotatable hook, and through a bobbin-thread through which the bobbin seal passes. An external rotatable hook having an outer circumferential wall formed by bobbin-thread passing opening, an enlarged opening formed on the outer circumferential wall of the rotary hook to be continuous with the bobbin-thread passing opening, and closed from the rotatable hook and closing the enlarged opening To this end, there is disclosed a horizontal rotary hook for a sewing machine comprising a bee member mounted to a rotary hook and a mounting holder provided on the rotary hook so that the lower portion of the bee member is mounted therein to hold the bee member.

According to the embodiment described above in the description, the beak member is mounted to a rotatable hook to close the enlarged opening. Therefore, it is possible to prevent the beak member from lying on the outer circumferential wall of the rotary hook, thereby preventing an increase in the thickness of the outer circumferential wall of the rotary hook and the overall size of the horizontal rotary hook. In addition, since the beak member is mounted therein while being held by the holder, the beak member can be reliably and firmly mounted to the rotatable hook. In addition, the beak member only needs to be exchanged when the ring capture bee is broken. Thus replacing the beak member results in lower repair costs than replacing the entire rotary hook.

In one embodiment of the disclosure, the beak member has an outer surface, the rotatable hook has a lower portion, and the mounting holder is formed to protrude outwardly from the outer circumferential wall of the rotatable hook, and is continuous with the outer circumferential wall of the rotatable hook and outside of the bee member. A reinforcing peripheral wall supporting the face, and a reinforcing bottom continuous with the bottom of the rotatable hook. As a result, even if the beak member is affected by the outward force due to thread entanglement, the outer surface of the beak member can be received and supported by the reinforcing peripheral wall, thereby improving the mounting strength of the beak member against outward stress.

In another embodiment of the description, the beak member is made of synthetic resin, and consequently the production cost can be reduced. If both the beak member and the outer rotary hook are made of synthetic resin, different materials can be used so that the material for the beak member has a higher hardness. As a result, the strength of the beak member can be improved.

Other objects, features and advantages of the present invention will become apparent from a review of the following description of the embodiments with reference to the accompanying drawings.

1A is a perspective view of a sewing machine according to a first embodiment of the present invention.

Fig. 1B is an enlarged perspective view of the needle plate of the sewing machine.

2 is a plan view of a horizontal fully rotary hook of a sewing machine.

3 is a plan view of the bobbin case holder of the sewing machine.

4 is a plan view of the rotary hook of the sewing machine.

5 is a perspective view of a rotary hook with disassembled beak member.

6 is a perspective view of the rotatable hook seen from another angle.

FIG. 7 is a view similar to FIG. 4 showing a state before the beak member is attached. FIG.

FIG. 8 is a view taken along lines 8-8 of FIG.

9 is a perspective view of the beak member.

10 is an enlarged plan view of a beak of a sewing machine.

FIG. 11 is a view of the beak as seen in the arrow J direction in FIG.

12 is a perspective view of a horizontal rotary hook of the embodiment.

Some embodiments of the present invention will be described with reference to the accompanying drawings. In an embodiment, the invention is applied to a horizontal fully rotary hook in which the outer rotary hook rotates continuously in one direction. The overall structure of the sewing machine is described with reference to Figs. 1A and 1B. The sewing machine includes a sewing arm 53 integrally formed with the bed to be mounted on the bed as shown in FIG. 1A, and a main body 51 including the sewing bed 52. Arm 53 has a distal end with needle bar 55 with sewing needle 54. The needle bar 55 is vertically moved by a drive device (not shown). On the other hand, the metal needle plate 56 is mounted on the upper surface of the bed 52 to face the needle bar 55. The needle plate 56 has a needle hole through which the needle 54 passes, and a plurality of elongated slits 56b for the operation of the teeth (not shown). The needle plate 56 also has a rectangular bobbin-receiving hole 57 located in front of the needle hole 56a and the elongated slit 57a. The bobbin-receiving hole 57 has two slide grooves 57a (only left slide grooves are shown) formed in the inner right and left portions, respectively. The transparent slide lid 58 (see FIG. 1A) is configured to be slidably inserted into the grooves 57a back and forth while opening and closing the bobbin-receiving hole 57.

A cloth feed mechanism (not shown) is provided inside the bed 52 to drive the teeth synchronized with the vertical movement of the needle bar 55. In addition, the horizontal fully rotary hook 1 of this embodiment is located below the bobbin-receiving hole 57. The horizontal fully rotary hook 1 includes the bezel member 50, an external rotary hook 3 (see FIG. 2) which rotates horizontally in synchronization with the vertical movement of the needle bar 55, and an internal bobbin case holder 2 (See Fig. 2). The bobbin 7, on which the bobbin thread 59 is wound, is detachably housed in the inner rotary hook bobbin case holder 2 as shown in FIG. 1B. The plastic press plate 60 is mounted below the needle plate 56 to be positioned in the bobbin-receiving hole 57. The pressing plate 60 has an opening through which the bobbin 7 is inserted into and taken out of the bobbin case holder 2. The pressing plate 60 further has a rotation limiter portion (not shown) formed below it to limit the rotation of the bobbin case holder 2.

In the sewing machine of this configuration, when the rotary hook 3 is rotated counterclockwise in synchronization with the vertical movement of the needle bar 55, the needle thread formed by the sewing needle 54 under the sewing needle ear 56a Rings (not shown) are captured by the ring catching beak member 5. This rotation direction will be referred to herein as "hook rotation direction A". The thread loop is entangled with the bobbin thread 59 while passing through the outside of the bobbin case holder 2, and as a result, a suture is formed.

Horizontal fully rotary hook 1 will be described in detail with reference to FIGS. First, the bobbin case holder 2 will be described. 3 and 12, the bobbin case holder 2 is made of synthetic resin material such as nylon resin, and is formed in a substantially cylindrical shallow container shape. The interior of the bobbin case holder 2 functions as a bobbin-receiving area 11 for receiving the bobbin 7. The bobbin case holder 2 has a lower part with a shaft 8 formed in the center on which the bobbin 7 is to be mounted.

Referring to FIG. 3, the bobbin case holder 2 includes an outer circumferential portion formed of a rotation limiter 12 positioned in front of the bobbin case holder 2 to prevent rotation of the bobbin case holder 2. The outer periphery of the bobbin case holder 2 is further formed with a notch 10 located inwardly as shown in FIG. 3, allowing the needle 54 to pass through the notch. The notch 10 has one end formed by the protruding thread guide 13. The bobbin-receiving region 11 has an inner wall with a tensioning member (not shown) which makes the bobbin chamber 59 taut. The tension member comprises an arc-shaped thread tension bracket and an arc-shaped tension spring mounted on the inner wall of the bobbin-receiving region 11 in an overlapping state.

This time, the rotary hook 3 will be described. 5 and 6, the rotary hook 3 includes a cylindrical receptacle shaped hook body 4 having an open top, a beak member 5 mounted to the hook body 4, A drive shaft 6 extending downward from the center bottom of the hook body 4. In the embodiment, the hook body 4 and the drive shaft 6 are each made of synthetic resin, such as nylon resin, and are integrally formed with one another, for example by injection molding. The beak member 5 is made of synthetic resin such as polyimide resin. The material of the beak member 5 has a higher hardness than the material of the hook body 4.

The hook body 4 has a disk-shaped lower part 21 and a peripheral wall 20 formed integrally with the lower part so as to stand up from the outer peripheral part of the lower part. The hook body 4 has a diameter slightly larger than the bobbin case holder 2. The hook body 4 comprises a portion formed of a needle-thread passing opening 22 through which the needle thread captured by the beak member 5 passes, as shown in FIGS. do. The wall 20 is further formed with an enlarged opening 23 (see FIG. 5) that is continuous with the opening 22 and to which the beak member 5 is attached. The outer circumferential wall 20 has an upper edge formed from an annular lace 24 having an inner peripheral side one step lower than the upper edge. The outer periphery of the bobbin case holder 2 has a lower end that is positioned in the race 24 so as to be slidable thereon as shown in FIGS. 2 and 12, so that the bobbin case holder 2 has a lower portion 21. Slightly spaced apart from it is received in the rotary hook (3). 10 and 11, the dashed line K indicates the movement trajectory of the lower end of the outer periphery of the bobbin case holder 2 that slides on the race 24. In FIG.

4 and 5, the drive shaft 6 is formed in a pipe shape and has a shaft hole 6a extending vertically through it. The drive shaft 6 further has a worm gear type gear formed on its outer circumference. A rotatable hook shaft (not shown) is configured to be inserted through the shaft hole 6a. The rotary hook shaft has a lower end fixed to the sewing machine frame (lower of the bed 52), thereby rotatably supporting the rotary hook 3. The gear of the drive shaft 6 is introduced to engage and engage with the drive gear (not shown) of the hook drive, so that the rotary hook 3 is in the hook rotation direction A through the drive gear and the drive shaft 6. Is rotated.

The beak member 5 is a component that separates from the hook body 4 in the embodiment and is detachably attached to the hook body 4. The mounting structure for the beak member 5 will be described in detail. First, the structure 5 of the beak member will be described. The beak member 5 has the same height as the outer circumferential wall 20, and is formed in a plate shape curved at the same curvature as the wall 20 when viewed from above as shown in FIGS. 5 and 9 to 11. The beak member 5 is sized to close the enlarged opening 23. The beak member 5 has a lower half acting substantially as a support wall 31 and an upper half acting as a beak peripheral wall 32 located on the outer circumferential side of the race 24.

Beek peripheral wall 32 has an upper surface including the front side with respect to the rotation direction A of the rotary hook, as shown in FIG. The guide surface 32d is formed on the front side of the upper surface of the bend peripheral wall 32. The beak peripheral wall 32 further has a rear upper end formed by the outwardly projecting thread engaging step 32c. The thread engagement step 32c is provided for engaging with and securing the needle thread ring.

In addition, the vial peripheral wall 32 is formed integrally with the wall 32 so as to be located close to the lower side (under the dashed line K) of the lace 24, as shown in Figs. 4, 6 and 9-11. It has an inner periphery comprising a thin plate-shaped horizontal beak body 33. The beak body 33 has a front end with respect to the rotation direction A of the rotary hook. The front end of the bee main body 33 is formed to extend toward the front side and protrude inwardly to a predetermined dimension. The beak peripheral wall 32 and the beak main body 33 constitute a thread capturing beak. In addition, the two positioning pins 37 extend downward from the bottom of the support wall 31 of the beak member 5 as shown in Figs.

The fixing block 34 is formed integrally with the inner periphery of the support wall 31 as shown in FIG. The fixing block 34 includes a lower portion 36 mounted at the lower end of the supporting wall 31 and a pair of substantially triangular sidewalls 35 extending from the opposite ends of the lower portion 36. The lower part 36 is formed in a rectangular shape and has a fixing screw hole 36a located at the center.

On the other hand, the hook body 4 is provided with a mounting holder 43 for holding the beak member 5. The mounting holder 43 is a reinforcement peripheral wall 41 which projects outward from the peripheral wall 20 of the hook body 4 and supports the lower outer surface of the beak member 5 as shown in FIGS. 7 and 8. It includes. The mounting holder 43 further includes a reinforcing lower portion 40 that is continuous to the lower portion 21 and constitutes a lower portion of the mounting holder 43. In addition, the reinforcement peripheral wall 41 has an end having an internal reinforcement wall 42 formed adjacent to the inner surface of the beak member 5 so as to be parallel to the reinforcement peripheral wall 41. Each of the peripheral walls 41 and 42 has a height, for example, defined as about one third of the height of the peripheral wall 20. The reinforcement peripheral wall 41 has both ends continuous to the outer peripheral wall 20. In addition, the reinforcement peripheral wall 41 has an edge located on the front side with respect to the rotation direction A of the rotary hook as shown in FIG. The cylindrical edge support 41a is formed at the corner to be located at the edge of the reinforcing lower 40. Thus, the edge supporting portion 41a, the reinforcing peripheral wall 41 and the inner reinforcing wall 42 come into contact with the beak member 5 inserted to face upward, thereby holding the beak member 5 in the vertical position.

On the other hand, the reinforcement lower portion 40 continuous to the lower portion 21 is generally formed in a T shape so as to be positioned slightly lower than the lower portion 21 as shown in the plan view. The reinforcing lower portion 40 has a screw hole 40a forming an inner part thereof, whereby the screw hole 40a corresponds to the screw hole 36a of the fixing block 34 of the beak member 5. The reinforcement lower part 40 further has a circular pin hole 40b for setting the position of the beak member 5 and an elongated circular pin hole 40c extending slightly further laterally than the pin hole 40b. Pin holes 40b and 40c are formed to correspond to the two positioning pins 37, respectively. The small fastening screw 38 is inserted upwardly through the screw hole 40a to screw into the screw hole 36a of the fastening block 34 (see FIG. 5), whereby the beak member 5 is rotated by the hook 3. Is fixed to.

The plurality of inclined surfaces 32a, 33a, 20a and 20b are formed when the rotary hook 5 and the beak member 5 are injection molded. Also, as shown in Fig. 10, the first inclined surface 32a is formed at the front end of the bend peripheral wall 32 with respect to the rotation direction A of the rotary hook 3. The first inclined surface 32a is inclined outward. The second inclined surface 33a is formed at the front end of the beak main body 33 with respect to the rotation direction A of the rotary hook 3 as shown in FIG. The second inclined surface 33a is inclined downward forward.

On the other hand, the third inclined surface 20a is formed at the edge of the peripheral wall 20 facing the enlarged opening 23 and the beak member 5 as shown in Figs. The third inclined surface 20a is inclined outward. In addition, as shown in FIG. 11, the fourth inclined surface 20b is formed at the front edge of the race 24. The fourth inclined surface 20b is inclined downward in the forward direction. The bobbin case holder 2 is configured to slide smoothly on the race 24 due to the configuration of the inclined surfaces 32a, 33a, 20a and 20b.

The operation and effect of the horizontal fully rotary hook 1 of the above configuration will be described below. The beak member 5 is mounted to the rotary hook 3 in the following manner. First, the beak member 5 is provided to the rotary hook 3 from above as shown in Fig. 5 and mounted to the mounting holder 43. In this case, the beak member 5 is inserted while being guided by the reinforcement peripheral wall 41 and the inner reinforcement wall 42. As a result, the positioning pins 37 formed at the lower end of the beak member 5 are inserted into the pin holes 40b and 40c formed at the reinforcing lower portions 40, respectively. The beak member 5 is mounted to the mounting holder 43 so that the beak member 5 can be easily positioned.

The pin hole 40c is slightly longer laterally than the pin hole 40b. Thus, even if there is a numerical error in the distance between the positioning pins 37, the error can be corrected by the long pin hole 40c. As a result, the beak member 5 can be mounted on the rotary hook 5 reliably and accurately, and productivity and mobility can be improved. In addition, the beak member 5 is guided by the inner reinforcement wall 42 and the reinforcement peripheral wall 41 to the reinforcement lower portion 40 of the mounting holder 43, so that the beak member 5 is connected to the rotary hook 3. It can be easily mounted.

When the beak member 5 is positioned in the reinforcing lower portion 40, the fixing screw 38 of the beak member 5 is screwed into the screw holes 40a and 36a, respectively, so that the beak member 5 is a rotary hook. Fixed to (3) via a fixing block (34). Thus, the beak member 5 is stably fixed to the rotary hook 3 and mounted reliably. In addition, two positioning pins 37 are engaged with the pin holes 40b and 40c, respectively. As a result, even if the beak member 5 is affected by an outwardly acting external stress caused by thread entanglement or the like, the strength of the beak member 5 can be increased to withstand the stress.

Also in this case, the edge supporting portion 41a, the reinforcing peripheral wall 41 and the inner reinforcing wall 42 are configured to contact the beak member 5, thereby holding the beak member 5 in the vertical position. . In addition, the outer surface of the beak member 5 is in contact with the inner surface of the reinforcement peripheral wall 41, and the front side of the beak member 5 with respect to the rotational direction A of the rotary hook 3 is from the corner supporting portion 41a and the inside. Contact With respect to the rotational direction A of the rotary hook 3, the front inner surface of the beak member 5 abuts from the outside with the inner reinforcing wall 42. Therefore, the beak member 5 is reinforced by contacting the edge support part 41a, the reinforcement peripheral wall 41, and the internal reinforcement wall 42. As shown in FIG. As a result, the strength to withstand the aforementioned external stress can be ensured.

In addition, since the beak member 5 is fixed to the rotary hook 3 by the fixing screw 38, the beak member 5 can be easily replaced whenever needed. Thus, the exchange can result in a lower exchange cost than the exchange of the entire rotary hook 3. Since the synthetic resin is used as the material for the beak member 5, the beak member can be easily formed into a product. The synthetic resin reduces the production cost of the beak member 5 compared to the beak member 5 made of metal. In addition, since the rotary hook 3 is made of nylon resin and the beak member is made of polyimide resin having a higher hardness than the nylon resin, sufficient hardness for the beak member 5 can be ensured. In addition, the production cost in this case can be reduced in comparison with the case of the totally rotatable hook 3 made of polyimide resin.

In addition, the enlarged opening 23 is formed so as to be continuous with the needle-thread passage opening 22. The beak member 5 is mounted to the rotary hook 3 to close the enlarged opening 23. Therefore, the thickness of the outer peripheral wall 20 does not need to be increased. Thus, the beak member 5 and the rotary hook 3 can be composed of individual components even if the size of the rotary hook 3 is not increased. In addition, even if the beak member 5 and the rotary hook 3 are separated from each other, the outer peripheral wall 20 of the rotary hook 3 can be extended by the bead peripheral wall 32, whereby the needle thread can be reliably captured. Can be. In addition, the beak main body 32 is formed to extend toward the front side and protrude inwardly to a predetermined dimension. As a result, the needle thread can be captured more effectively and reliably.

The rotary hook 3 is rotated in the direction of rotation A by a hook drive device (not shown) during the sewing operation, so that the bobbin case holder 2 is rotated relative to the rotary hook 3 and supported by the lace 24. (See Fig. 12).

The beak peripheral wall 32 is located outside of the race 24 of the rotary hook 3 (outside of the dashed line K) and is continuous to the outer peripheral wall 20. As a result, the bobbin case holder 2 can be smoothly rotated without colliding with the vial peripheral wall 32.

The seal guide portion 13 of the bobbin case holder 2 is prevented from colliding with the bend peripheral wall 32 and the beak main body 33 when passing through the beak main body 33. In addition, the beak peripheral wall 32 is formed of the first inclined surface 32a, and the beak main body 33 is formed of the second inclined surface 33a. Each inclined surface is located on the front side of the beak member 5 with respect to the rotation direction A of the rotary hook 3. Since the thread guide part 13 is guided by the inclined surfaces 32a and 33a, the thread guide part 13 of the bobbin case holder 2 can pass smoothly through the beak member 5.

In addition, the seal guide 13 may be prevented from colliding with the front edge of the outer peripheral wall 20 when passing through the front edge of the outer peripheral wall 20. Further, the front edge of the outer circumferential wall 20 is formed of the third and fourth inclined surfaces 20a and 20b located both on the front side with respect to the rotation direction A of the rotary hook 3. Since the thread guide part 13 is guided by the third and fourth inclined surfaces 20a and 20b, the thread guide part 13 may smoothly pass through the front edge of the outer circumferential wall 20.

Some variations of the above-described embodiments will be described. The beak member 5 may instead be made of metal. Three or more positioning pins 37 may be formed in the beak member 5. In addition, three or more pin holes may be formed in the reinforcement lower portion 40. If sufficient space is allowed to be provided around the rotatable hook 3, the reinforcement peripheral wall 41 may have an increased height by about half the height of the outer peripheral wall 20. In this case, the reinforcement strength of the beak member 5 can be further improved.

The foregoing description and drawings are only illustrative of the principles of the invention and are not to be construed in a limiting sense. Many modifications and variations will be apparent to those of ordinary skill in the art. All such modifications and variations are considered to be included within the spirit of the invention as defined by the appended claims.

Claims (8)

With internal bobbin case holder for receiving bobbin, An external rotatable hook which receives the bobbin case holder and is rotated in a predetermined direction with the bobbin case holder accommodated in the rotatable hook and has an outer peripheral wall formed by a bobbin-thread passage opening through which the bobbin thread passes; An enlarged opening formed in an outer circumferential wall of the rotatable hook so as to be continuous with the bobbin-thread passage opening; A beak member detached from said rotatable hook and attached to said rotatable hook to close said enlarged opening; And a mounting holder provided on the rotatable hook and having a lower portion of the bee member mounted therein to hold the bee member. The beacon member of claim 1, wherein the bee member has an outer surface, the rotatable hook has a lower portion, and the mounting holder is formed to protrude outwardly from the outer circumferential wall of the rotatable hook, and is continuous with the outer circumferential wall of the rotatable hook. And a reinforcing peripheral wall supporting an outer surface of the member and a reinforcing lower part continuous with the lower part of the rotatable hook. 2. The horizontal rotary hook of claim 1 wherein said beak member is made of synthetic resin. The horizontal rotary hook of claim 1, wherein the external rotary hook is made of synthetic resin. The horizontal rotary hook of claim 1 wherein the bee member is made of a material having a higher hardness than the material of the external rotary hook. 3. The horizontal rotating hook of claim 2 wherein the beak member has a lower end formed by a plurality of positioning pins, and the reinforcement lower portion of the mounting holder has a plurality of pin holes into which the positioning pins are respectively inserted. 7. The horizontal rotary hook of claim 6 wherein at least one of the pin holes is larger than the other holes. The horizontal rotary hook of claim 1 wherein the bee member is mounted to the bottom of the rotary hook by a screw.

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