KR20030088369A - Sewing machine - Google Patents

Abstract

The sewing machine according to the present invention can minimize the deviation of the length dimension of the thread from the knot part to the end.

At the end of sewing, the knot side of the thread 6 provided for sewing is connected to the first scalpel 7 supported by the needle plate 5 and the second scalpel 8 rotatably supported by the needle plate 5. In the sewing machine 1 to cut and cut | disconnect, the rotation drive part which rotatably supports the 1st scalpel to the needle board 5, and rotates the 1st scalpel 7, and the rotation of the 1st scalpel 7, It is provided with the interlocking mechanism which rotates 2nd scalpel 8 interlockingly, At the end of sewing, the said rotation drive part is rotated, and the 1st scalpel 7 and the 2nd scalpel 8 are used to seal the thread 6. It is configured to cut the knot side.

Description

Sewing machine {SEWING MACHINE}

The present invention relates to a sewing machine for sewing a button to a sewing object by monocyclic sewing and, at the end of sewing, inserting and cutting a thread connected to a sewing position formed by sewing with two scalpels.

Background Art A button attaching sewing machine is conventionally known in which a button is sewn onto a cloth by monocyclic sewing. In this button attaching sewing machine, when sewing a button having a plurality of holes, in order to sew a sewing under the sewing cloth while sewing a thread through the holes alternately through the needles alternately through the different holes of the buttons. Moved the buttons and sewing cloth.

Therefore, in this button attaching sewing machine, a thread cutting device is constituted by a fixed scalpel fixed to a lower surface of a needle plate as a scalpel support, and a movable scalpel rotatably supported by a needle plate having a needle hole through which a needle passes. Equipped with. At the end of sewing, the moving mes is inserted into the needle hole of the needle plate through the sewing knot to catch the thread hanging on the looper below the needle plate, and then rotates to cooperate with the fixed knife to cut the thread. do.

The fixed scalpel is spaced laterally away from the shandong route of the needle so as not to catch the needle moving up and down.

The scalpel is driven by an air cylinder through the ring. That is, when the air cylinder is driven, the ring moves in the front-rear direction, and the moving blade rotates. During the rotation, the moving blade passes through the needle hole from the sewing knot of the sewing material on the needle plate, and the looper below the needle plate. The thread is caught by the hook, and the thread is inserted and cut by the both blades at the engagement position of the moving blade and the fixed blade during the end of the rotation.

However, in the button attaching machine, as described above, a plurality of holes of the buttons penetrate each other, but the buttons have two holes or four holes. In the case of changing the sewing conditions, there are different things depending on the needle, the hole to be penetrated, and the sewing conditions at the end of sewing. In this case, the positions of the sewing knots formed last are different.

That is, the position of the last sewing knot differs with respect to the fixed scalpel, and therefore the thread length from the last sewing knot portion to the fixed scalpel also differs. When the position of the last sewing knot is close to the fixed scalpel, the remaining length of the thread from the sewing knot to the thread cutting end becomes relatively short, and when the position of the last sewing knot is far from the fixed scalpel, the thread is cut from the sewing knot. The remaining length of the yarn to the end becomes relatively long.

In this way, when the remaining length of the thread is short, the last thread knot is released, and as a characteristic of monocyclic sewing, the entire sewing is easily released and the button is released as the end is released. In addition, when the length of the remaining yarn is long, there is a big problem that the good appearance of the sewing product is deteriorated and the quality of the sewing product is deteriorated.

1 shows an embodiment of the present invention, and is an external perspective view of a round bar sewing machine.

2 is a partial perspective view of the sewing machine showing the rotational drive and the holding mechanism.

3 is a schematic perspective view of each scalpel and the holding plate in a state where the needle plate is detached.

It is a schematic perspective view of each scalpel and a holding plate which show the state which inserted the start end side of a thread into the holding hole of a holding plate.

Fig. 5 is a schematic perspective view of each scalpel and the holding plate showing a state where the starting end side of the yarn is pinched by the holding plate and the sliding plate.

It is a schematic perspective view of each scalpel and a holding plate which show the positional relationship with the thread of a knot side.

It is a schematic perspective view of each scalpel and a holding plate which show the state which cut | disconnected the start end side and the knot side of a thread with each scalpel.

8 is a schematic top view of each scalpel and a holding plate showing a state in which the respective scalpels are associated.

It is a schematic top view of each scalpel and a holding plate which show the state pinched by the holding plate and the sliding plate by the start end side of a seal | sticker.

Fig. 10 is a schematic top view of each scalpel and the holding plate showing a state in which the holding plate is moved to pull the starting end side of the yarn.

It is a schematic side view of a part of the sewing machine which shows the state which sewing the thread.

It is a schematic side view of a part of the sewing machine which shows the state which carried out the root winding process to the thread.

13 is a schematic block diagram of a sewing machine.

Explanation of symbols on the main parts of the drawings

1: round bar sewing machine 4: needle

5: needle plate 6: thread

6a: end portion 6b: end portion

7: first scalpel 8: second scalpel

9: air cylinder 10: cutting link

11: holding plate 11a: holding hole

12: sliding plate 13: pulse motor

14: maintenance link

An object of the present invention is to make a thread remaining length from a sewing knot to a thread cutting end in a button sewing machine, and to reduce the deviation of the thread remaining length.

In order to achieve the above object, for example, as shown in Figs. 1 to 13, in the invention of claim 1, the first scalpel 7 rotatably supported by the scalpel support and the scalpel support are rotatably supported. And a supported second scalpel 8, a rotation driving unit for rotating the first scalpel, and an interlock mechanism for rotating the second scalpel opposite to the rotation of the first scalpel. By driving, the said 1st scalpel and said 2nd scalpel are rotated, both scalpels are engaged, both scalpels are joined, and the continuous thread is cut from the sewing knot part.

According to the invention of claim 1, at the end of sewing, the first scalpel and the second scalpel are rotated in association with each other, and the thread continuous to the sewing knot is sandwiched between the first scalpel and the second scalpel. That is, the thread is caught by any of the first and second scalpels to be rotated, and is moved by the first and second scalpels after the thread moves to the engagement position of the first and second scalpels together with the hanging scalpel. Is cut.

In this association position, the knot side of the thread is cut at the engagement position of each scalpel even if the position of the knot side of the thread is either the first scalpel side or the second scalpel side, and the deviation of the length dimension of the thread from the knot part to the end is determined. Can be minimized. That is, as in the conventional method of fixing the first scalpel to the scalpel support and rotating only the second scalpel, the assembling position of each scalpel becomes the first scalpel and the knot of the knot side of the thread is the first scalpel. When the length dimension of the thread from the part to the end becomes short, and the position of the knot side of the thread is the second scalpel side, the length dimension of the thread from the knot part to the end does not become long, so that the deviation of the length dimension is large. There is nothing to be done.

In the invention according to claim 2, the sewing machine according to claim 1 includes a holding mechanism for holding the starting end side of the thread on the scalpel support side at the start of sewing.

According to the invention described in claim 2, in addition to the action of claim 1, at the start of sewing in which the start end of the thread is inserted into the cloth, the start end side of the thread is held toward the scalpel support zone. With these, even when excessive tension is applied to the thread during sewing, it is possible to hold the starting end side of the thread on the scalpel support side. Therefore, at the time of sewing, the starting end side of the thread is not pulled out from the cloth, and it is possible to sew securely.

In the invention according to claim 3, in the sewing machine according to claim 2, the sewing drive unit is driven at the end of sewing, and the knot side and the starting end side of the thread are simultaneously cut by the first and second scalpels. It is characterized in that it is configured to.

According to the invention of claim 3, in addition to the invention of claim 1, the starting end side of the thread is also caught by either the first and second scalpels that rotate, similarly to the knot side, and the first scalpel together with the hooked scalpel. After moving to the engagement position of a 2nd scalpel, it cuts in a 1st scalpel and a 2nd scalpel.

Thereby, the position at the start end side of the thread is cut at the engagement position of each scalpel, whether the first scalpel side or the second scalpel side, and the deviation of the length dimension of the thread from the knot portion to the start end can be minimized. Can be.

In addition, the knot side and the starting end side of the thread can be cut at the same time by one operation of the first scalpel and the second scalpel, the sewing time of the sewing material can be significantly shortened, and the sewing cost of the sewing material can be reduced. .

In the invention according to claim 4, in the sewing machine according to claim 2 or 3, the retaining mechanism includes a retaining plate having a retaining hole through which a starting end side of the thread is inserted, and the retaining plate from an upper surface thereof as a moving material. A holding plate supporting member for supporting and a moving mechanism capable of moving the holding plate in a substantially horizontal direction,

At the start of sewing, the starting end side of the seal is inserted through the holding hole of the holding plate protruding from the end of the holding plate supporting member, and the holding plate is moved to the holding plate supporting member side by the moving mechanism. It is characterized in that it is configured to sandwich the starting end side of the seal on the lower surface side of the holding plate and the upper surface side of the holding plate support member.

According to invention of Claim 4, in addition to the action of Claim 2 or 3, a thread can be hold | maintained with a simple structure by fitting the starting end side of a thread with a retaining plate and a sewing machine supporter existing in the sewing machine.

In addition, by inserting the thread through the holding hole of the holding plate, and fitting the lower surface side of the holding plate and the upper surface side of the scalpel support, it is possible to reliably resist excessive thread tension at the time of sewing. It is extremely advantageous at the time.

In the invention of claim 5, in the sewing machine of claim 4, the holding mechanism is configured to hold the starting end side of the thread at a predetermined holding position at the start of sewing, and the starting end side of the thread is When it is relaxed, it is comprised so that the said holding plate may be moved further from the said holding position, and the starting end side of the said seal may be pulled to the said holding plate support member side.

According to the invention of claim 5, in addition to the function of claim 4, when the root of the button is finished, for example, when the fabric is lowered to the scalpel support side, the starting end side of the thread relaxes between the fabric and the scalpel support. . In this case, by moving the holding plate further from the holding position and pulling the starting end side of the thread to the scalpel support side, the loosening of the starting end side of the thread is eliminated, and the starting end side of the thread is in a relatively tensioned state.

As a result, at the end of sewing, the starting end side of the yarn, which is in a relatively tense state, is cut by each scalpel. Therefore, there is no case where the starting end side of the thread is relaxed and cannot be cut without being caught by each scalpel. In addition, it is possible to make the cut position on the start end side substantially constant, and to make the deviation in the length dimension of the yarn from the knot part to the start end smaller.

The sewing machine 1 shown in FIG. 1 is an example of a button sewing machine for sewing a button on a sewing cloth by monocyclic sewing, and at the same time performing a root winding sewing machine, which forms an upper part of the sewing machine and extends in the front-rear direction. A sewing machine frame 1c having an arm 1a and a sewing machine bed 1b which extends in the front-rear direction and which forms a lower part of the sewing machine, exhibits a substantially inverse "C" shape when viewed from the side. In addition, the sewing machine 1 has a lower plate 3 installed on the sewing machine bed 1b side and adjacent to the lower surface of the cloth 2, and a hole provided on the sewing machine arm 1a side and through which a thread passes, and moves up and down. The needle 4 which sews the cloth 2 by this is provided.

Moreover, this sewing machine 1 is the needle board 5 arrange | positioned under the lower board 3, and the looper 5b arrange | positioned under the needle board 5, as shown to FIG. 11 and FIG. Have The needle plate 5 is provided with a needle hole 5a through which the needle 4 which moves up and down can be inserted. That is, by repeating the operation | movement which rocks the looper 5b corresponding to the shanghai movement of the needle 4 by repeating the thread 6 to the looper 5b below the cloth 2, Sewing of monocyclic sewing by 6) is performed. The drive mechanism and structure of the looper 5b are the same as those known in the related art, and thus will not be described here.

In the sewing machine 1 of this embodiment, as shown in FIG. 12, when it is knotted inside the cloth 2, the start end side of the thread 6 (hereinafter, referred to as the start end portion 6a). The knot side (hereinafter referred to as end portion 6b) of the thread 6 is formed to extend downward through the needle hole 5a.

As shown in FIG. 8, the first scalpel 7 and the second scalpel 8 are rotatably supported on the lower surface of the needle plate 5 as the scalpel support. Guide grooves 7a formed by bending are formed in the first scalpel 7, and the pins 8a formed on the second scalpel 8 side are inserted through. That is, in this embodiment, the interlock mechanism is comprised by the guide groove 7a and the pin 8a, and it operates so that the 2nd scalpel 8 may rotate by operating opposite to the rotation of the 1st scalpel 7. In the present embodiment, when the first scalpel 7 rotates in one direction, the second scalpel 8 is configured to rotate in the other direction.

As shown in FIG. 8, a knot portion 7b is formed in the first scalpel 7 to accommodate a thread 6 extending downward from the inside of the cloth 2, and in the second scalpel 8, As seen from the upper surface, the cutting force 8b is formed in the part which engages with the knot part 6b. In this embodiment, the knot part 7b and the cutting force 8a are comprised so that it may associate under the needle hole 5a of the needle board 5. That is, when the first scalpel 7 rotates in one direction, the second scalpel 8 rotates in the other direction, and the knot portion 7b of the first scalpel 7 moves substantially in the left and right direction. , The cutting force 8b of the second scalpel 8 moves in the opposite direction to the knot portion 7b. The thread 6 extending downward from the inside of the cloth 2 through the needle hole 5a is sandwiched and cut by the respective scalpels 7, 8. It is preferable that this association position is located on the orthogonal horizontal line which passes through the middle part of the vibration range in vibrating to-be-engaged objects, such as a button.

As shown in FIG. 2 and FIG. 3, the other end side of the cutting link 10 whose one end side is connected to the air cylinder 9 is connected to the first scalpel 7. In this embodiment, the cutting link 10 extends in the front-back direction, and the cutting link 10 moves in the front-back direction by the drive of the air cylinder 9. That is, as the air cylinder 9 and the cutting link 10, the rotation drive part which rotates the 1st mes 7 is comprised.

In this embodiment, as shown in FIG. 3, the holding plate 11 and the sliding plate 12 which support the holding plate 11 so that sliding from the upper surface are provided below the 1st scalpel 7 are provided. It is. As shown in FIG. 2, the other end side of the retaining link 14 whose one end side is connected to the pulse motor 13 side via a plurality of links is connected to the retaining plate 11. In the present embodiment, the retaining link 14 extends in the front-rear direction, and the retaining link 14 moves in the front-rear direction by the rotation of the pulse motor 13. That is, in this embodiment, the moving mechanism which moves the holding plate 11 in the substantially horizontal direction is provided with the pulse motor 13 and the holding link 14. In addition, in this embodiment, the holding mechanism is provided with the moving mechanism, the holding plate 11, and the sliding plate 12. As shown in FIG.

In addition, as shown in FIG. 4, the holding plate 11 is comprised so that the sliding plate 12 can protrude below the needle hole 5a. Here, the holding plate 11 is formed with a holding hole 11a through which the seal 6 can be inserted, and protrudes downward from the sliding plate 12 to the needle plate 5a. The seal 6 extending downwards through the shape becomes insertable.

In addition, as shown in FIG. 13, the sewing machine 1 includes an air cylinder 9, a pulse motor 13, a needle drive unit 15 for swinging the needle 4, and a cloth 2. To the cloth drive unit 16 for moving the rod in the horizontal direction, the lower plate drive unit 17 for moving the lower plate 3 up and down, and the take-up mechanism 18 for pulling the thread 6 of the needle 4 to the supply side. The control part 100 is provided. Hereinafter, the operation of the controller 100 will be described.

First, as an initial state, the knot part 7b of the 1st scalpel 7 and the cutting force 8b of the 2nd scalpel 8 are mutually spaced apart. In this state, sewing is started, and as shown in FIGS. 4 and 9, after the start portion 6a is inserted into the holding hole 11a of the holding plate 11, the pulse motor 13 is driven to The holding plate 11 is moved to the sliding plate 12 side. Thereby, as shown in FIG. 5, the starting part 6a is fitted into the lower surface of the holding plate 11, and the upper surface of the sliding plate 12, and the starting part 6a of the sliding plate 12 is carried out. It is held in the holding position.

Subsequently, the needle drive unit 15 and the cloth drive unit 16 are controlled to sew a predetermined sewing on the cloth 2, and the thread 6 is knotted inside the cloth 2. Moreover, the edge part 6b at the time of a knot is located to the side of the sliding plate 12, as shown in FIG. 6B. Here, at the time of sewing, even when excessive tension is applied to the seal 6, the start end portion 6a is held at the holding position of the sliding plate 12. In this embodiment, after sewing a button to the cloth 2 with monocyclic sewing as shown in FIG. 11, as shown in FIG. 12, the cloth 2 is moved upward together with the lower plate 3. The yarn 6 is knotted with a rooting process in a state where the thread 6 is tensioned in the horizontal direction between the button and the cloth 2.

After the rooting treatment is completed, the cloth 2 is moved downward together with the lower plate 3. In this case, the start end part 6a and the end part 6b relax. Here, as shown in FIG. 10, the holding plate 11 is further moved from the holding position to pull the start end portion 6a toward the sliding plate 12 side, and at the same time by the thread winding mechanism 18. The end portion 6b is pulled to the supply side. As a result, the relaxation of the start end portion 6a and the end portion 6b is eliminated, and the start end portion 6a and the end portion 6b are brought into a relatively tense state.

Next, as shown in FIG. 7, the air cylinder 9 is driven to rotate the first scalpel 7 and the second scalpel 8 by rotating them, and the starting end portion 6a and the end portion 6b are rotated. ) Is cut by simultaneously inserting the first scalpel 7 and the second scalpel 8. That is, the start end portion 6a and the end portion 6b are caught by any one of the first scalpel 7 and the second scalpel 8 that rotate, and the first scalpel 7 and the second scalpel together with the scalpel. After moving to the engagement position of the scalpel 8, it is sandwiched and cut by the first scalpel 7 and the second scalpel 8.

As described above, according to the sewing machine 1 of the present embodiment, the position of the start end portion 6a and the end portion 6B is always the first scalpel 7 side or the second scalpel 8 side. It is possible to cut at the assembling position of the scalpels 7 and 8 and to minimize the deviation in the length dimension of the thread 6 from the knot part to the start and end.

Moreover, according to the sewing machine 1 of this embodiment, since the starting end part 6a is hold | maintained on the sliding plate 12 side, when sewing, even when excessive tension is applied to the thread 6 at the time of sewing, The starting end side of the yarn 6 is not pulled out from the cloth 2, and can be sewed securely.

Moreover, according to the sewing machine 1 of this embodiment, the knot side and the starting end side of the thread 6 can be cut | disconnected simultaneously by one operation of the 1st scalpel 7 and the 2nd scalpel 8, and sewing The sewing time of water can be shortened remarkably, and the manufacturing cost of a sewing material can be reduced.

Moreover, according to the sewing machine 1 of this embodiment, since the starting end side of the thread 6 is pinched by the holding plate 11 and the sliding plate 12, the thread 6 can be hold | maintained with a simple structure. . In addition, the thread 6 is inserted into the holding hole 11a of the holding plate 11, and the pin 6 is pinched to the lower surface side of the holding plate 11 and the upper surface side of the sliding plate 12. It can reliably resist excessive tension of the yarn 6 at the time of sewing, and is extremely advantageous in practical use.

Moreover, in the said embodiment, although applying this invention to the monocyclic sewing machine 1 is shown, even if it is sewing to cloth by another method, the effect similar to the said embodiment can be acquired.

In addition, in the said embodiment, the thread 6 is inserted through the holding hole 11a of the holding plate 11, and the pin 6 is pinched by the sliding plate 12 and the holding plate 11, Although the holding of the thread 6 is shown, for example, a pair of holders which approach and detach from each other may be provided, and the thread may be held by holding the thread by both holders.

In addition, in the said embodiment, although showing the movement of the holding plate 11 by the drive of the pulse motor 13, you may make it move the holding plate 11 by an air cylinder. In addition, although the 1st scalpel 7 is rotated by the air cylinder 9, the 1st scalpel 7 may be rotated by a pulse motor or the like.

In the above embodiment, the first scalpel 7 and the second scalpel 8 are shown to be interlocked using the guide grooves 7a and the pins 8a. However, each scalpel 7, 8) may be linked to each other by a link or the like, and of course, the specific details and the like may be changed as appropriate.

As described above, according to the invention described in claim 1, the position of the knot side of the thread is cut at the engagement position of each scalpel, whether the first scalpel side or the second scalpel side, and from the knot portion to the end. The deviation of the length dimension of the seal can be minimized.

According to the invention of claim 2, in addition to the effects of claim 1,

Since the starting end side of the thread is held on the holding plate support member side, even when excessive tension is applied to the thread at the time of sewing, the starting end side of the thread can be reliably sewn without being pulled out of the cloth.

According to the invention of claim 3, in addition to the effects of claim 2,

Whether the position at the start end side of the thread is the first scalpel side or the second scalpel side, it is to be cut at the engagement position of each scalpel and the variation in the length dimension of the thread from the knot to the start end can be minimized. .

In addition, the knot side and the starting end side of the thread can be simultaneously cut by one operation of the first scalpel and the second scalpel, the sewing time of the sewing material can be significantly shortened, and the sewing cost of the sewing material can be reduced. .

According to the invention described in claim 4, in addition to the action of claim 2 or 3,

It is possible to hold the starting end side of the thread with a simple configuration, to reliably resist excessive thread tension at the time of sewing, and to be extremely advantageous in actual use.

According to the invention of claim 5, in addition to the effects of claim 4,

There is no case that the starting end side of the thread is relaxed and cannot be cut without being caught by each scalpel, and the cutting position on the starting end side of the thread can be made substantially constant, and the length dimension of the thread from the knot part to the starting end The deviation of can be minimized.

Claims (5)

A first scalpel rotatably supported by a scalpel support, a second scalpel rotatably supported by the scalpel support, a rotation drive unit for rotating the first scalpel, and a movement of the first scalpel opposite to a rotation of the first scalpel And a linkage mechanism for rotating the two scalpels, and at the end of sewing, by driving the rotation drive unit, the first scalpel and the second scalpel are rotated to engage the first and second scalpels, and in the assembling position. A sewing machine characterized by cutting a continuous thread from a sewing knot. The sewing machine according to claim 1, further comprising a holding mechanism for holding the starting end side of the thread on the scalpel support side at the start of sewing. The sewing machine according to claim 2, wherein at the end of sewing, the rotating drive unit is driven to cut the knot side and the starting end side of the thread at the same time by the first scalpel and the second scalpel. . 4. The holding mechanism according to claim 3, wherein the holding mechanism includes a holding plate having a holding hole through which the starting end side of the seal is inserted, a holding plate supporting member for movably supporting the holding plate from an upper surface thereof, and the holding plate. A moving mechanism movable in a substantially horizontal direction, At the start of sewing, the starting end side of the seal is inserted through the holding hole of the holding plate protruding from the end of the holding plate supporting member, and the holding plate is moved to the holding plate supporting member side by the moving mechanism. And pinching the starting end side of the thread on the lower surface side of the holding plate and the upper surface side of the holding plate support member. The holding mechanism according to claim 4, wherein the holding mechanism is configured to hold the starting end side of the yarn at a predetermined holding position at the start of sewing, and the holding mechanism is held from the holding position when the starting end side of the yarn is relaxed. And the plate is further moved, and the starting end side of the thread is pulled to the holding plate support member side.