JP4726569B2 - Sewing machine cloth cutting equipment - Google Patents

Description

  The present invention relates to a sewing machine cloth cutting apparatus for forming a button hole in a sewing product.

  In general, a buttonhole overlock sewing machine is known as a sewing machine that performs overlock stitching around a buttonhole formed in a cloth (a sewing object). This buttonhole sewing machine includes a cloth cutting device provided with a cloth cutting knife and a knife receiver facing each other in the vicinity of the sewing needle. As button holes, eyelet holes (also referred to as eyelet button holes) formed by connecting a drop-like hole (eyelet part) and a straight hole (straight part), and a straight hole (straight part) There are sleepy buttonholes that are formed only from.

  Here, the cloth cutting knife for forming the eyelet button hole has, for example, a shape in which a drop-shaped blade that forms the eyelet portion and a linear blade that forms the straight portion are connected to each other, and the sleeper button The cloth cutting knife for forming a hole includes a straight blade that forms a straight portion. And, for example, in a state where the fabric is placed on the cloth cutting knife provided below, the button receiver is driven downward and pressed against the cloth and the cloth cutting knife to form a button hole. It is supposed to be.

  By the way, conventionally, there has been proposed a cloth cutting device capable of forming eyelet button holes and sleepy button holes of various sizes without replacing the cloth cutting knife and the knife receiver. For example, in the cloth cutting device described in the second embodiment of Patent Document 1, the cloth cutting means provided in the cloth cutting device includes a cloth cutting knife on the lower side and a knife receiver on the upper side. A cloth cutting knife has a eyelet female part that forms the eyelet part and a straight female part that forms the straight part in a buttonhole buttonhole comprising a eyelet part and a straight part, and the knife receiver is the cloth It is arranged to face the cutting knife up and down, and has a eyelet knife receiving portion that matches the eyelet knife portion and a linear knife receiving portion that matches the straight knife portion. And at least one of the eyelet knife portion and the linear knife portion of the cloth cutting knife, when the knife receiver is driven to move down, a position where the knife receiver can be cut to match the knife receiver, and the knife receiver For example, when the straight knife portion is movable without moving the straight knife portion, the pig knife portion is at a position where the cloth can be cut. In this state, the cloth cutting knife and knife receiver are matched once to form the eyelet part of the eyelet button hole and a part of the straight part, and the eyelet female part is cut at the position where the cloth cannot be cut (that is, only the straight knife part is cut). Forming the rest of the straight part of the eyelet buttonhole by moving the cloth cutting knife and the knife receiver one or more times after moving (retracting) to a possible position), forming eyelet buttonholes of various sizes Be able to There. Note that after the formation of the eyelet button hole (after the end of the cloth cutting), the eyelet part that has been saved returns to the initial position to prepare for the next button hole formation.

In addition, if the eyelet part of the cloth cutting knife is moved (retracted) to a position where the cloth cannot be cut from the beginning, the sleeping knife of various sizes can be obtained by matching the cloth cutting knife and the knife receiver one or more times. A buttonhole can be formed. When the button hole to be cut next is the eyelet button hole, after the sleepy button hole is formed (after the cloth cutting is completed), the eyelet part that has been saved returns to the initial position.
JP 2003-88695 A

  However, in the conventional cloth cutting device that performs multiple times of cloth cutting described in Patent Document 1, since the eyelet knife part is retracted and returned, cloth waste or thread waste generated by thread cutting or cloth cutting is not generated during sewing. There is a problem that the eyelet knife part cannot be returned to the predetermined initial position by being caught by the movable part of the eyelet knife part, and this causes a problem that the eyelet knife part and the knife receiver come into contact with each other and the eyelet knife part is damaged. there were.

  In addition, when forming the eyelet button hole, the straight female receiving portion of the female receiver that matches the straight female portion when cutting a part of the eyelet portion and the linear portion by the first cutting, and the straight portion by the second and subsequent cuttings. When cutting only the knife part, the straight knife receiving part of the knife receiver that matches the straight knife part is the same part. As the number of matches with the knife increases and the burden on this part increases, the wear of the linear knife receiving part advances from the eyelet knife receiving part. Furthermore, since only the straight knife receiving portion is used when the sleepy buttonhole is formed, the number of matches between the straight knife receiving portion and the cloth cutting knife relative to the eyelet knife receiving portion is further increased. As a result, the knife matching part of the straight knife receiving part becomes recessed from the knife matching part of the eyelet knife receiving part, and there is a problem that the eyelet part and the straight line part cannot be cut in the first cutting. It was.

  An object of the present invention is to provide a cloth cutting device for a sewing machine that can take into account the above-described problems and can reliably form button holes of various lengths and types for a long period of time without problems.

In order to solve the above problems, the invention described in claim 1 is provided in a sewing machine that forms a button hole in a sewing product and forms a holed seam around the button hole,
A cloth cutting knife having a eyelet female part that forms the eyelet part and a straight female part that forms the straight part in a buttonhole buttonhole comprising a eyelet part and a straight part, and the cloth above the cloth cutting knife A cloth cutting means provided with a knife receiver disposed opposite to the cutting knife and coinciding with the cloth cutting knife;
A cloth cutting drive means for driving one up and down so that the cloth cutting knife and the knife receiver come in contact with and apart from each other;
The cloth cutting means is a cloth cutting device for a sewing machine that forms a button hole by cutting a sewing product when the cloth cutting knife and the knife receiver match each other.
The female knife receiver includes a first knife receiver formed of a horizontal plane that is longer than the cloth cutting knife, and a second knife receiver formed of a horizontal plane that extends downward from the first knife receiver. And
When the cloth cutting knife and the knife receiver are matched, the first knife receiving portion is aligned with both the eyelet knife portion and the linear knife portion, and the second knife The receiving portion is provided with a knife receiving driving means for horizontally moving to a second position that matches only the linear knife portion.

Thus, according to the first aspect of the present invention, since the cloth cutting knife below the cloth cutting device is fixed and the knife receiver above is moved, the cloth generated at the time of cloth cutting and sewing is generated. Waste and yarn waste are not caught between the movable parts of the cloth cutting device.
Regarding the formation of the eyelet button hole, the first knife receiving part used at the first cutting when the knife receiver matches both the piglet knife part and the straight knife part, and the second time when the knife receiver matches only the straight knife part. Since the second knife receiving portion used at the time of subsequent cutting is provided, each knife receiving portion is used independently, and the number of times that each of the knife receiving portions partially matches the cloth cutting knife is different. The part disappears. For this reason, the progress of wear is uniform in each female receiving part, and the state of the dent in the female receiving part is not different as in the conventional case, and the state of the dent in the female receiving part is not changed. It can be made uniform, and at the time of cloth cutting, the eyelet portion and the straight portion can be reliably cut without any trouble.

The invention according to claim 2 is provided in a sewing machine that forms a button hole in the sewing product and forms a holed seam around the button hole,
A cloth cutting knife having a eyelet female part that forms the eyelet part and a straight female part that forms the straight part in a buttonhole buttonhole comprising a eyelet part and a straight part, and the cloth above the cloth cutting knife A cloth cutting means provided with a knife receiver disposed opposite to the cutting knife and coinciding with the cloth cutting knife;
A cloth cutting drive means for driving one up and down so that the cloth cutting knife and the knife receiver come in contact with and apart from each other;
The cloth cutting means is a cloth cutting device for a sewing machine that forms a button hole by cutting a sewing product when the cloth cutting knife and the knife receiver match each other.
The female receiver has a third female receiving part made of a horizontal surface formed to have a length equal to or longer than the eyelet female part, and a fourth female receiving part made of a horizontal surface matching the straight female part,
The third knife receiving part and the fourth knife receiving part are such that when the cloth cutting knife and the knife receiver are matched, only one of the third knife receiving part and the fourth knife receiving part is the cloth. It is arranged at a predetermined distance so as to match the cutting knife and the connecting part of the both knife receivers is provided with a recess that does not match the cloth cutting knife,
When the cloth cutting knife and the knife receiver are matched, the knife receiver is moved to a third position where the third knife receiving part matches the eyelet knife part, and the fourth knife receiving part is the linear knife part. It is characterized by comprising a scalpel receiving drive means for horizontally moving to a fourth position that coincides only with the first position.

Thus, according to the invention described in claim 2, since the cloth cutting knife below the cloth cutting device is fixed and the knife receiver above is moved, the cloth generated at the time of cloth cutting and sewing is generated. Waste and yarn waste are not caught between the movable parts of the cloth cutting device.
In addition, regarding the formation of the eyelet button hole, it is used at the time of the second and subsequent cuttings when the knife receiver matches only the straight knife part and the third knife receiving part used at the first cutting when the knife receiver matches the eyelet knife part. Since the fourth knife receiving part is provided, the third knife receiving part is used when forming the eyelet part, and the fourth knife receiving part is used when forming the straight part. Thereby, each knife receiving part is used independently, and the site | part from which the frequency | count which matches a cloth cutting knife partially differs in each knife receiving part is lost. For this reason, the progress of wear is uniform in each female receiving part, and the state of the dent in the female receiving part is not different as in the conventional case, and the state of the dent in the female receiving part is not changed. It can be made uniform, and at the time of cloth cutting, the eyelet portion and the straight portion can be reliably cut without any trouble.

The invention according to claim 3 is provided in a sewing machine that forms a button hole in a sewing product and forms a hole seam around the button hole,
A cloth cutting knife having a eyelet female part that forms the eyelet part and a straight female part that forms the straight part in a buttonhole buttonhole comprising a eyelet part and a straight part, and the cloth above the cloth cutting knife A cloth cutting means provided with a knife receiver disposed opposite to the cutting knife and coinciding with the cloth cutting knife;
A cloth cutting drive means for driving one up and down so that the cloth cutting knife and the knife receiver come in contact with and apart from each other;
The cloth cutting means is a cloth cutting device for a sewing machine that forms a button hole by cutting a sewing product when the cloth cutting knife and the knife receiver match each other.
The female receiver is composed of a horizontal surface formed to have a length equal to or longer than the eyelet female portion, a fifth female receiver portion disposed above the linear female portion side, and a horizontal surface that matches the linear female portion. A sixth knife receiving portion disposed above the eyelet knife portion side,
When the cloth cutting knife and the knife receiver are matched, the knife receiver is moved to the fifth position on the eyelet female part side where the fifth knife receiving part matches the eyelet knife part, and the sixth knife receiver. It is characterized by comprising a scalpel receiving drive means for horizontally moving the part to a sixth position on the straight scalpel part side that matches only the straight scalpel part.

Thus, according to the invention described in claim 3, since the cloth cutting knife below the cloth cutting device is fixed and the knife receiver above is moved, the cloth generated at the time of cloth cutting and sewing is generated. Waste and yarn waste are not caught between the movable parts of the cloth cutting device.
Regarding the formation of the eyelet button hole, a fifth knife receiving part disposed above the straight knife part used for the first cutting when the knife receiver matches the piglet knife part, and the knife receiver is a straight knife part. Since the sixth knife receiving portion disposed above the eyelet knife portion used at the time of the second and subsequent cuttings that match only the eyelet portion is provided, when the eyelet portion is formed, the fifth knife receiving portion is provided. It is used by moving to the eyelet knife part side, and when forming the straight part, the sixth knife receiving part is moved to the straight knife part side. Thereby, each knife receiving part is used independently, and the site | part from which the frequency | count which matches a cloth cutting knife partially differs in each knife receiving part is lost. For this reason, the progress of wear is uniform in each female receiving part, and the state of the dent in the female receiving part is not different as in the conventional case, and the state of the dent in the female receiving part is not changed. It can be made uniform, and at the time of cloth cutting, the eyelet portion and the straight portion can be reliably cut without any trouble.

  According to the present invention, it is possible to greatly reduce malfunction due to cloth waste and yarn waste and damage to the cloth cutting knife caused by the malfunction. Further, cutting failures due to wear of the knife receiver can be greatly reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<First Embodiment>
FIG. 1 is an explanatory diagram for explaining a schematic configuration of a buttonhole sewing machine (hereinafter simply referred to as “sewing machine”) 1 provided with a cloth cutting device 10 for a sewing machine according to the present embodiment. The sewing machine 1 is a sewing machine that forms a button hole of a predetermined shape by automatic control and performs overlock sewing around the button hole. A pedestal 3 standing upright, an arm 4 extending along the longitudinal direction from the pedestal 3 onto the bed 2, a feed base 5 for moving the workpiece in a horizontal plane, A cloth presser 6 for pressing the cloth on the upper surface, a cloth cutting device 10 for forming a button hole, a control device (not shown) for controlling the operation of the sewing machine 1, and the like are roughly configured.

The cloth cutting device 10 forms the eyelet buttonhole 70 shown in FIGS. 7A to 7D and the sleepy buttonhole 80 shown in FIGS. 8A to 8D when buttonhole sewing is performed. Is.
As shown in FIGS. 2 to 4, the cloth cutting device 10 includes a cloth cutting means 20, and the cloth cutting means 20 includes a cloth cutting knife 30 and a knife receiver 50. They are arranged so that 50 faces upward.

The cloth cutting knife 30 includes an eyelet female part 30a that forms an eyelet part 71 and a linear part 72 in an eyelet button hole 70 including an eyelet part 71 and a linear part 72 as shown in FIGS. Is formed on the upper surface of the bed portion 2 and is fixed to a female base 32 fixed to the upper surface of the bed portion 2 by screws 31 with a female fixing plate 33 and screws 34. A key K is attached to the female base 32 with two screws 35 so that the upper surface of the bed portion 2 can be moved in parallel with the depth direction of FIG. 2 (the left-right direction of FIG. 3). In addition, a cloth chute boss 36 is press-fitted into the knife base 2, and a cloth chute 37 is attached to the cloth chute boss 36 by a set screw 38. A hose 39 is fixed to one side of the cloth chute 37 by a band 40 so that the cloth waste can be discharged to the outside of the sewing machine. In addition, on the upper surface of the cloth cutting knife 30, when the eyelet knife part 30a and the straight knife part 30b and a first knife receiving part 50a described later match, the second knife receiving part 50b described later contacts the cloth cutting knife. A relief portion 30c having a concave shape so as not to contact is provided.
In addition, it is preferable that the blade part of the cloth cutting knife 30 has a length capable of cutting with a minimum desired cutting length.

  The female receiver 50 is movably fitted in the mounting groove 51 a of the female receiver mounting base 51, and via a cylinder mounting plate 53 that is attached to the female receiver mounting base 51 so that the position can be adjusted by a screw 52. The rod end screw portion 55a of the air cylinder 55 as a female receiver driving means fixed by a screw 54, the screw portion 50c provided on the female receiver 50 and a nut 56 are fixed, and the air cylinder 55 is moved horizontally in the axial direction. It is possible. In this embodiment, the air cylinder is used as the knife receiver driving means for moving the knife receiver 50, but other driving sources may be used. In this embodiment, the drive source and the female receiver are directly connected, but they may be connected via a link or the like.

  A stopper 57 for restricting the initial position of the knife receiver 50 is attached to the knife receiver mounting base 51 with a screw 58 so that the position can be adjusted. The knife receiver mounting base 51 is fixed to a vertical shaft 59 that can be moved up and down by cloth cutting drive means (not shown) with a screw 60, and the vertical shaft 59 is fitted to a metal 61 so as to be movable up and down. The metal 61 is attached to the lower surface of the arm portion 4 with screws 62. A joint 63 is attached to the female receiver mounting base 51, and the air discharged from the joint 63 passes through a hole 63a provided in the female receiver mounting base 51 and a hole 50d provided in the female receiver 50, and the cloth is cut. Waste is smoothly discharged through the hole 30 d of the cloth cutting knife 30 and the hole 32 a of the knife base 32 and discharged from the cloth chute 37.

  On the lower surface of the knife receiver 50, the eyelet button as shown in FIGS. 7 (a) to 7 (d) is cut off in accordance with both the eyelet knife part 30a and the linear knife part 30b of the cloth cutting knife 30. The first knife receiving portion 50a formed of a horizontal plane for forming part of the eyelet portion 71 and the straight portion 72 in the hole 70 and the straight knife portion 30b of the cloth cutting knife 30 are matched with each other, and the workpiece is cut. A second knife receiving portion 50b made of a horizontal plane for forming only the straight portion 72 in the eyelet button hole 70 is provided.

  The first knife receiving part 50a is formed to have a length longer than both the blade part of the cloth cutting knife, that is, the eyelet knife part 30a and the straight knife part 30b, and the cloth cutting knife 30 and the second knife receiving part 50b are matched. In order to prevent the cloth from being cut at the first knife receiving portion 50a, the stepped shape is retracted upward from the second knife receiving portion 50b. Moreover, the 2nd knife receiving part 50b becomes the step shape extended below rather than the 1st knife receiving part 50a. It is preferable that the 2nd knife receiving part 50b shall be the minimum length which cut | disconnects a flower hole (sleeping eye hole). Further, when the cloth cutting knife 30 and the first knife receiving part 50b are matched, the second knife receiving part 50b does not contact the linear knife part 30b and the relief part 30c due to the step shape and the relief part 30c described above. A gap is formed.

Next, the operation | movement at the time of forming an eyelet buttonhole in the cloth cutting device 10 of the above structures is demonstrated.
At the time of cutting the eyelet button hole cloth, first, the knife receiver 50 is horizontally moved to the first position shown in FIG. In this state, as shown in FIG. 5 (b), the knife receiver 50 is moved downward by the cloth cutting driving means, and the first knife receiving part 50a of the knife receiver 50 and the blade part (eyelet knife part of the cloth cutting knife 30). 30a and the straight knife part 30b) are lowered to a position where they coincide to form part L1 of the eyelet part 71 and the straight part 72 as shown in FIG. 7A, and then the knife receiver 50 is moved to a predetermined position. Raise to.
At this time, the generated cloth waste passes through the hole 30d of the cloth cutting knife 30, the hole 32a of the knife base 32, and the cloth chute 37 by the air from the joint 63 attached to the knife receiving mount 51, and the outside of the sewing machine. Is discharged.

Next, when the cutting length of the straight portion 72 does not reach the predetermined length set by the above cutting, the air cylinder 55 is operated and the knife receiver 50 is moved to the second position in FIG. Move horizontally. In this state, the cloth feed device (not shown) moves the cloth of the feed base 5 by the calculated amount of movement, and then the knife receiver 50 is moved by the cloth cutting drive means as shown in FIG. The straight knife 30b of the cloth cutting knife 30 and the second knife receiver 50b of the knife receiver 50 are lowered again to a position where they match, and the L2 portion is cut and connected as shown in FIG. 7B. The amount of increase to the predetermined position after the cutting described above may be a minimum position where the knife receiver 50 and the cloth do not sufficiently contact when the cloth is fed by the cloth feeding device.
If the cutting length of the straight line portion 72 has not yet reached the set predetermined length, the cloth cutting operation at the second position is performed, and the remaining portion (for example, until the predetermined length is cut) , The cutting of the portion L3 in FIG. 7C and the portion L4 in FIG. 7D is repeated.

Next, the operation | movement at the time of forming a sleepy eye buttonhole in the cloth cutting device 10 is demonstrated.
When cutting the sleepy buttonhole, the knife receiver 50 is horizontally moved in advance to the second position in FIG. In this state, as shown in FIG. 6 (b), the knife receiver 50 is lowered by the cloth cutting driving means to a position where the linear knife part 30b of the knife cutter 50 and the second knife receiver 50b of the knife receiver 50 are matched. Then, as shown in FIG. 8A, the M1 portion of the cloth is cut. If the cutting length has not reached the predetermined length, the cloth cutting operation at the retracted position (second position) is repeated in the same manner as the above eyelet cutting, and the remaining length is cut until the predetermined length is cut. The part (for example, the M2 part in FIG. 8B, the M3 part in FIG. 8C, and the M4 part in FIG. 8D) is cut.

<Second Embodiment>
Next, a cloth cutting device according to a second embodiment will be described with reference to FIGS. In the present embodiment, since the configuration other than the knife receiver in the cloth cutting device is the same as that in the first embodiment, the same reference numerals are given and description thereof is omitted.

  On the lower surface of the knife receiver 150 of the present embodiment, the object to be sewn is cut only in conformity with the eyelet knife part 30a of the cloth cutting knife 30, and the eyelet buttonholes as shown in FIGS. 90, the third knife receiving portion 150a made of a horizontal plane for forming only the eyelet portion 91 in the shape of 90, and only the straight knife portion 30b of the cloth cutting knife 30 are cut to sew, and the straight portion in the eyelet button hole 90 is cut. A fourth knife receiving portion 150b made of a horizontal plane for forming only 92 is provided.

  The third knife receiving part 150a is formed to have a length equal to or longer than the eyelet knife part 30a of the cloth cutting knife. Moreover, it is preferable that the 4th knife receiving part 150b is made into the minimum length which cut | disconnects a flower hole (sleeping eye hole). Further, the third knife receiving portion 150a and the fourth knife receiving portion 150b are arranged so that only one of the third knife receiving portion 150a and the fourth knife receiving portion 150b is cut when the cloth cutting knife and the knife receiving portion are matched. It is arranged at a predetermined distance so as to match the knife. Further, the connecting portion 150 e of the third knife receiving portion 150 a and the fourth knife receiving portion 150 b is a recess that does not match the cloth cutting knife 30.

Next, the operation | movement at the time of forming an eyelet buttonhole in the cloth cutting device 110 of the above structures is demonstrated.
At the time of cutting the eyelet button hole cloth, first, the knife receiver 150 is horizontally moved to the third position shown in FIG. In this state, as shown in FIG. 9 (b), the knife receiver 150 is moved downward by the cloth cutting driving means so that the third knife receiving part 150 a of the knife receiver 150 and the eyelet knife part 30 a of the cloth cutting knife 30 match. As shown in FIG. 11A, the eyelet portion 91 (L5 portion) is formed, and then the knife receiver 150 is raised to a predetermined position.
At this time, the generated cloth waste is discharged to the outside of the sewing machine in the same manner as in the first embodiment.

Next, the air cylinder 55 is actuated to move the knife receiver 150 horizontally to the fourth position in FIG. In this state, the cloth feed device (not shown) moves the cloth of the feed base 5 by the calculated movement amount, and then the knife receiver 50 is moved by the cloth cutting drive means as shown in FIG. The straight knife part 30b of the cloth cutting knife 30 and the fourth knife receiver part 150b of the knife receiver 150 are lowered again to a position where the L6 part is cut and connected as shown in FIG. 11 (b). The amount of increase to the predetermined position after the cutting described above may be a minimum position where the knife receiver 150 and the cloth do not sufficiently contact when the cloth is fed by the cloth feeding device.
If the cutting length of the straight line portion 92 has not yet reached the set predetermined length, the cloth cutting operation at the fourth position is performed, and the remaining portion (for example, until the predetermined length is cut) , The cutting of the portion L7 in FIG. 11C and the portion L8 in FIG. 11D is repeated.
In addition, about the operation | movement at the time of forming a sleep eye hole button hole, the 2nd position in 1st Embodiment becomes a 4th position, and a 2nd knife receiving part changes into a 4th knife receiving part etc. At a certain point, since it is almost the same as the first embodiment, the description is omitted.

<Third Embodiment>
Next, a cloth cutting device according to a third embodiment will be described with reference to FIGS. In the present embodiment, since the configuration other than the knife receiver in the cloth cutting device is the same as that in the first embodiment, the same reference numerals are given and description thereof is omitted.

  On the lower surface of the knife receiver 250 of the present embodiment, the object to be sewn is cut only in accordance with the eyelet knife part 30a of the cloth cutting knife 30, and the eyelet buttonholes as shown in FIGS. 90, the fifth knife receiving portion 250a formed of a horizontal plane for forming only the eyelet portion 91 in the shape of the eyelet 90, and the straight knife portion 30b of the cloth cutting knife 30 are cut to match the sewing product, and the straight portion in the eyelet button hole 90 is cut. A sixth knife receiving portion 250b made of a horizontal plane for forming only 92 is provided.

  The fifth knife receiving portion 250a is disposed on the straight knife portion 30b side (the right side in FIG. 12A) of the knife receiver 250, and is formed to have a length longer than the eyelet knife portion 30a of the cloth cutting knife. The sixth knife receiver 250b is disposed on the eyelet knife part 30a side (left side of FIG. 12A) of the knife receiver 250, and preferably has a minimum length for cutting the flower hole (sleep eye hole). . Here, the fifth female receiving portion 250a and the sixth female receiving portion 250b may be separated by a step or may be on the same plane.

Next, the operation at the time of forming the eyelet button hole in the cloth cutting device 210 configured as described above will be described.
At the time of cutting the eyelet button hole cloth, first, the knife receiver 250 is horizontally moved to the fifth position shown in FIG. In this state, as shown in FIG. 12 (b), the knife receiver 250 is moved downward by the cloth cutting drive means so that the fifth knife receiving part 250 a of the knife receiver 250 and the eyelet knife part 30 a of the cloth cutting knife 30 match. As shown in FIG. 11A, the eyelet portion 91 (L5 portion) is formed, and then the knife receiver 250 is raised to a predetermined position.
At this time, the generated cloth waste is discharged to the outside of the sewing machine in the same manner as in the first embodiment.

Next, the air cylinder 55 is actuated to move the knife receiver 250 horizontally to the sixth position in FIG. In this state, the cloth feed device 5 moves the cloth by the calculated movement amount (not shown), and then, as shown in FIG. 13 (b), the knife receiver 50 is moved by the cloth cutting drive means. The straight knife part 30b of the cloth cutting knife 30 and the sixth knife receiving part 250b of the knife receiver 250 are lowered again, and the L6 part is cut and connected as shown in FIG. 11 (b). The amount of increase to the predetermined position after the cutting described above may be a minimum position where the knife receiver 250 and the cloth do not sufficiently contact when the cloth is fed by the cloth feeding device.
If the cutting length of the straight portion 92 has not yet reached the set predetermined length, the cloth cutting operation is performed at the sixth position, and the remaining portion (for example, until the predetermined length is cut) , The cutting of the portion L7 in FIG. 11C and the portion L8 in FIG. 11D is repeated.
In addition, about the operation | movement at the time of forming a sleep eye hole button hole, the 2nd position in 1st Embodiment changes to a 6th position, a 2nd knife receiving part turns into a 6th knife receiving part, etc. At a certain point, since it is almost the same as the first embodiment, the description is omitted.

As described above, according to the cloth cutting device for the sewing machine according to the first embodiment, the cloth cutting knife below the cloth cutting device is fixed and the knife receiver above is moved. In addition, cloth waste and thread waste generated during sewing are not caught between the movable parts of the cloth cutting device.
Regarding the formation of the eyelet button hole, the first knife receiving part used at the first cutting when the knife receiver matches both the piglet knife part and the straight knife part, and the second time when the knife receiver matches only the straight knife part. Since the second knife receiving portion used at the time of subsequent cutting is provided, each knife receiving portion is used independently, and the number of times that each of the knife receiving portions partially matches the cloth cutting knife is different. The part disappears. For this reason, the progress of wear is uniform in each female receiving part, and the state of the dent in the female receiving part is not different as in the conventional case, and the state of the dent in the female receiving part is not changed. It can be made uniform, and at the time of cloth cutting, the eyelet portion and the straight portion can be reliably cut without any trouble.

Further, according to the cloth cutting device of the sewing machine of the second embodiment, the cloth cutting knife below the cloth cutting device is fixed and the knife receiver above is moved. The cloth waste and the yarn waste that are sometimes generated are not caught between the movable parts of the cloth cutting device.
In addition, regarding the formation of the eyelet button hole, it is used at the time of the second and subsequent cuttings when the knife receiver matches only the straight knife part and the third knife receiving part used at the first cutting when the knife receiver matches the eyelet knife part. Since the fourth knife receiving part is provided, the third knife receiving part is used when forming the eyelet part, and the fourth knife receiving part is used when forming the straight part. Thereby, each knife receiving part is used independently, and the site | part from which the frequency | count which matches a cloth cutting knife partially differs in each knife receiving part is lost. For this reason, the progress of wear is uniform in each female receiving part, and the state of the dent in the female receiving part is not different as in the conventional case, and the state of the dent in the female receiving part is not changed. It can be made uniform, and at the time of cloth cutting, the eyelet portion and the straight portion can be reliably cut without any trouble.

Furthermore, according to the cloth cutting device of the sewing machine of the third embodiment, since the cloth cutting knife below the cloth cutting device is fixed and the knife receiver above is moved, the cloth cutting knife and the sewing machine are sewn. The cloth waste and the yarn waste that are sometimes generated are not caught between the movable parts of the cloth cutting device.
Regarding the formation of the eyelet button hole, a fifth knife receiving part disposed above the straight knife part used for the first cutting when the knife receiver matches the piglet knife part, and the knife receiver is a straight knife part. Since the sixth knife receiving portion disposed above the eyelet knife portion used at the time of the second and subsequent cuttings that match only the eyelet portion is provided, when the eyelet portion is formed, the fifth knife receiving portion is provided. It is used by moving to the eyelet knife part side, and when forming the straight part, the sixth knife receiving part is moved to the straight knife part side. Thereby, each knife receiving part is used independently, and the site | part from which the frequency | count which matches a cloth cutting knife partially differs in each knife receiving part is lost. For this reason, the progress of wear is uniform in each female receiving part, and the state of the dent in the female receiving part is not different as in the conventional case, and the state of the dent in the female receiving part is not changed. It can be made uniform, and at the time of cloth cutting, the eyelet portion and the straight portion can be reliably cut without any trouble.

  From these things, according to the cloth cutting device for the sewing machine of the first to third embodiments, the malfunction due to the cloth waste and the thread waste and the breakage of the cloth cutting knife due to the malfunction are greatly reduced. Can do. Further, cutting failures due to wear of the knife receiver can be greatly reduced.

  Of course, the present invention is not limited to the above-described embodiment and can be modified as appropriate.

It is a side view which shows the buttonhole sewing machine provided with the cloth cutting device which concerns on 1st Embodiment. It is a side view showing the cloth cutting device concerning a 1st embodiment. It is A view of FIG. FIG. 3 is a B view of FIG. 2. FIGS. 5A and 5B are side views showing the operation of the cloth cutting device of FIGS. 2 to 4, wherein FIG. 5A shows a state where the first knife receiving portion is positioned above the eyelet knife portion and the straight knife portion in the first position; ) Shows a state in which the first knife receiving portion matches the eyelet knife portion and the straight knife portion at the first position. It is a side view which shows operation | movement of the cloth cutting device of FIGS. 2-4, (a) shows the state which the 2nd knife receiving part was located above the linear knife part in the 2nd position, (b) is 2nd. A state in which the knife receiving portion matches the straight knife portion at the second position is shown. FIGS. 7A and 7B are diagrams for sequentially explaining how the eyelet button holes are formed during the operation of FIGS. 5 and 6; FIGS. FIG. 7 is a diagram for step by step explaining how to form a sleepy buttonhole during the operation of FIG. 6; It is a side view which shows operation | movement of the cloth cutting device which concerns on 2nd Embodiment, (a) shows the state which the 3rd knife receiving part was located above the eyelet knife part in the 3rd position, (b) is The state which the 3rd knife receiving part matched with the eyelet knife part in the 3rd position is shown. It is a side view which shows operation | movement of the cloth cutting device which concerns on 2nd Embodiment, (a) shows the state which the 4th knife receiving part was located above the linear knife part in the 4th position, (b) A state in which the fourth knife receiving portion matches the straight knife portion at the fourth position is shown. FIGS. 14A and 14B are diagrams for sequentially explaining how the eyelet button holes are formed during the operation of FIGS. 9 and 10 or FIGS. 12 and 13; FIGS. It is a side view which shows operation | movement of the cloth cutting device which concerns on 3rd Embodiment, (a) shows the state which the 5th knife receiving part was located above the eyelet knife part in the 5th position, (b) The state which the 5th knife receiving part corresponded with the eyelet knife part in the 5th position is shown. It is a side view which shows operation | movement of the cloth cutting device which concerns on 3rd Embodiment, (a) shows the state which the 6th knife receiving part was located above the linear knife part in the 6th position, (b) A state in which the sixth knife receiving portion matches the straight knife portion at the sixth position is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Buttonhole sewing machine 10,110,210 Cloth cutting device of sewing machine 20 Cloth cutting means 30 Cloth cutting knife 30a Eyelet knife part 30b Straight knife part 50,150,250 Knife holder 50a First knife receiver 50b Second knife receiver Part 150a Third female receiving part 150b Fourth female receiving part 150e Connection part 250a Fifth female receiving part 250b Sixth female receiving part 70, 90 Eyelet button hole 71, 91 Eyelet part 72, 92 Straight part 80 Sleeping eye button hole

Claims (3)

It is provided in a sewing machine that forms a button hole in the sewing object and forms a seam around the button hole.
A cloth cutting knife having a eyelet female part that forms the eyelet part and a straight female part that forms the straight part in a buttonhole buttonhole comprising a eyelet part and a straight part, and the cloth above the cloth cutting knife A cloth cutting means provided with a knife receiver disposed opposite to the cutting knife and coinciding with the cloth cutting knife;
A cloth cutting drive means for driving one up and down so that the cloth cutting knife and the knife receiver come in contact with and apart from each other;
The cloth cutting means is a cloth cutting device for a sewing machine that forms a button hole by cutting a sewing product when the cloth cutting knife and the knife receiver match each other.
The female knife receiver includes a first knife receiver formed of a horizontal plane that is longer than the cloth cutting knife, and a second knife receiver formed of a horizontal plane that extends downward from the first knife receiver. And
When the cloth cutting knife and the knife receiver are matched, the first knife receiving portion is aligned with both the eyelet knife portion and the linear knife portion, and the second knife A sewing machine cloth cutting device comprising: a knife receiving drive means for horizontally moving the receiving portion to a second position that matches only the linear knife portion. It is provided in a sewing machine that forms a button hole in the sewing object and forms a seam around the button hole.
A cloth cutting knife having a eyelet female part that forms the eyelet part and a straight female part that forms the straight part in a buttonhole buttonhole comprising a eyelet part and a straight part, and the cloth above the cloth cutting knife A cloth cutting means provided with a knife receiver disposed opposite to the cutting knife and coinciding with the cloth cutting knife;
A cloth cutting drive means for driving one up and down so that the cloth cutting knife and the knife receiver come in contact with and apart from each other;
The cloth cutting means is a cloth cutting device for a sewing machine that forms a button hole by cutting a sewing product when the cloth cutting knife and the knife receiver match each other.
The female receiver has a third female receiving part made of a horizontal surface formed to have a length equal to or longer than the eyelet female part, and a fourth female receiving part made of a horizontal surface matching the straight female part,
The third knife receiving part and the fourth knife receiving part are such that when the cloth cutting knife and the knife receiver are matched, only one of the third knife receiving part and the fourth knife receiving part is the cloth. It is arranged at a predetermined distance so as to match the cutting knife and the connecting part of the both knife receivers is provided with a recess that does not match the cloth cutting knife,
When the cloth cutting knife and the knife receiver are matched, the knife receiver is moved to a third position where the third knife receiving part matches the eyelet knife part, and the fourth knife receiving part is the linear knife part. A sewing machine cloth cutting device comprising: a knife receiving drive means for horizontally moving to a fourth position that coincides with only the first position. It is provided in a sewing machine that forms a button hole in the sewing object and forms a seam around the button hole.
A cloth cutting knife having a eyelet female part that forms the eyelet part and a straight female part that forms the straight part in a buttonhole buttonhole comprising a eyelet part and a straight part, and the cloth above the cloth cutting knife A cloth cutting means provided with a knife receiver disposed opposite to the cutting knife and coinciding with the cloth cutting knife;
A cloth cutting drive means for driving one up and down so that the cloth cutting knife and the knife receiver come in contact with and apart from each other;
The cloth cutting means is a cloth cutting device for a sewing machine that forms a button hole by cutting a sewing product when the cloth cutting knife and the knife receiver match each other.
The female receiver is composed of a horizontal surface formed to have a length equal to or longer than the eyelet female portion, a fifth female receiver portion disposed above the linear female portion side, and a horizontal surface that matches the linear female portion. A sixth knife receiving portion disposed above the eyelet knife portion side,
When the cloth cutting knife and the knife receiver are matched, the knife receiver is moved to the fifth position on the eyelet female part side where the fifth knife receiving part matches the eyelet knife part, and the sixth knife receiver. A cloth cutting device for a sewing machine, comprising: a knife receiving drive means for horizontally moving the section to a sixth position on the side of the straight knife section that matches only the straight knife section.