JP6467699B2 - sewing machine - Google Patents

Description

  The present invention relates to a sewing machine that is suitable for an operator to perform a sewing operation with a hand close to a needle drop portion.

  2. Description of the Related Art Conventionally, as described in Patent Document 1, for example, there is a sewing machine including a cloth folding device on the near side of a needle drop portion. The cloth folding device includes a plate-shaped guide portion that can move in the left-right direction, a ruler portion that is positioned to the right of the guide portion and has a curved surface corresponding to the guide portion, and an air nozzle that biases the cloth with air pressure. . With the guide portion and the ruler portion approaching each other at a predetermined interval, the fabric can be folded back between the right end portion of the guide portion and the curved surface of the ruler portion by the air flow ejected from the air nozzle. The folded fabric is sent to the needle drop section and sewn.

  In a sewing machine equipped with this cloth folding device, it is necessary to provide a driving mechanism or the like for moving the guide part to the left and right in the sewing machine bed. For this reason, as shown in FIG. 1 in Patent Document 1, a drive mechanism or the like is located on the front side of the sewing machine bed.

  Here, when the drive mechanism or the like of the cloth folding device is located on the front side of the sewing machine bed, the drive mechanism or the like interferes with the operator, and it is difficult for the operator to bring his hand around the needle drop portion. For this reason, when the operator sets the fabric in the needle drop portion, it is difficult to align the position at which the fabric starts to be sewn with the needle drop portion, so that the sewing efficiency tends to be lowered. This is particularly a problem for industrial sewing machines used for sewing large quantities of clothing.

  Further, together with the fabric folding device, a fabric edge cutting device capable of cutting the edge of the fabric folded during the sewing operation on the near side of the needle drop portion, and a fabric piece cut by the fabric edge cutting device There is also a sewing machine provided with a suction device for inhaling. In such a sewing machine, since the cloth edge cutting device and the suction device are present, the size of the front side of the needle drop portion of the sewing machine bed becomes larger, so the above problem becomes even more remarkable.

Japanese Patent Laid-Open No. 10-233504 (FIG. 1)

  Accordingly, in view of the above problems, the present invention provides a sewing machine that makes it easy for an operator to bring a hand near the needle drop portion, and allows the operator to quickly set the fabric on the needle drop portion to improve the sewing efficiency. The task is to do.

  In the sewing machine according to the present invention, a cloth folding device that folds an end portion of the cloth is provided in a sewing bed, and the cloth folding device is located on the front side of the needle drop portion. At least the fabric folding device includes the needle A recess is provided on the front side of the falling part and opened to the front and upward.

  According to this configuration, even if the sewing machine is provided with the cloth folding device, the operator can easily bring his hand close to the needle drop portion.

  And the lower end of the said recessed part is lower than the position of 1/3 from the top in the up-down direction distance of the upper surface of a needle plate and the lower end position of the said sewing machine bed in the longitudinal direction cross section which passes along the said needle drop part. And it can also be located above the lower end of the sewing machine bed.

  And the said recessed part has the inclination part of the shape which descends to the near side in the front-back direction longitudinal cross section, and the lower end of the said inclination part as a lower end of the said recessed part is the front-back direction longitudinal cross section which passes through the said needle drop part. Therefore, the vertical distance between the upper surface of the needle plate and the lower end position of the sewing machine bed may be lower than the position of 1/3 from above and higher than the lower end of the sewing machine bed.

  According to these configurations, it is possible to secure a space in which at least a part of the operator's hand enters the recess provided in the fabric folding apparatus.

  And the lower end of the said recessed part shall be in the position of 25 mm-100 mm below from the upper surface of a throat plate in the front-back direction longitudinal cross section which passes through the said needle drop part.

  According to this configuration, it is possible to form a recess suitable for the average hand size of the operator.

  The cloth folding device can be configured to be able to move to the front side with respect to the sewing machine bed.

  According to this configuration, the front side of the sewing machine can be exposed by separating the folding device from the sewing machine bed.

  Further, according to the present invention, a fabric folding device that folds the end portion of the fabric is provided in the sewing bed, and the fabric folding device and the fabric folded during the sewing operation are disposed on the front side of the needle drop portion of the sewing bed. In a sewing machine in which a fabric edge cutting device capable of cutting an edge and a suction device for sucking a piece of fabric cut by the fabric edge cutting device are located, at least the fabric folding device is more than the needle dropping unit. On the front side, a concave portion opened to the front side and the upper side is provided.

  According to this configuration, even in a sewing machine provided with a cloth folding device, a cloth edge cutting device, and a suction device, it is easy for an operator to bring his hand close to the needle drop portion.

  According to the present invention, it is easy for an operator to bring his hand close to the needle drop portion. For this reason, since an operator can set cloth | dough in a needle drop part quickly, sewing efficiency can be improved.

It is a perspective view which shows the sewing machine of this embodiment. It is a perspective view which shows a sewing machine bed unit among the sewing machines of this embodiment. It is a perspective view which shows the state which separated | separated the cloth folding apparatus from the sewing machine bed in the sewing machine bed unit. It is a perspective view of the longitudinal section which shows the circumference of a needle drop part in the sewing machine bed unit. It is the schematic which expanded the principal part which shows the relationship between the fabric folding | turning apparatus and fabric among the sewing machines of this embodiment. It is the schematic of the longitudinal cross-section which shows an example of the lower end shape of a recessed part, Comprising: (a) is an example which a lower end has a horizontal surface, (b) is an example which has a flat inclined surface at a lower end, (c) was curving at the lower end. It is an example which has an inclined surface.

  Next, the present invention will be described by taking an embodiment. Regarding the expression in the front-rear direction, the side closer to the operator who performs sewing is referred to as “front side”, and the side farther from is referred to as “rear side”. In addition, the vertical and horizontal expressions are expressed in the direction when the operator views the sewing machine.

  The sewing machine 1 of the present embodiment is a multi-needle double chain stitch sewing machine. As shown in FIG. 1, the sewing machine 1 includes a sewing machine bed unit 2 positioned below and a sewing machine arm 3 arranged so as to cover the sewing machine bed unit 2 from above.

  Although not shown, the sewing machine 1 is reciprocated in the vertical direction by a needle drive mechanism built in the sewing machine arm 3 and is parallel to the horizontal direction (two or three in the illustrated sewing machine 1). ). A fabric presser 31 that presses the fabric to be sewn from above and a needle plate 21 that is positioned below the needle and fixed to the upper surface of the sewing machine bed 2a that is a basic part of the sewing machine bed unit 2 are provided. The needle plate 21 has a needle drop portion 21a that is a hole through which a needle that reciprocates in the vertical direction can pass. Further, a fabric feed mechanism 22 protrudes around the needle drop portion 21 a in the needle plate 21. The fabric feed mechanism 22 has a plurality of feed teeth 221 that move relative to the needle plate 21 (see FIG. 4), and the fabric pressed by the fabric presser 31 from above is intermittently moved backward. Can send.

  The sewing machine bed unit 2 according to the present embodiment has a sewing machine bed 2a which is a basic part having a mechanism for supplying a lower thread from below the cloth at the time of sewing. A device such as the device 6 is attached. This sewing machine bed unit 2 is unitized in the unit shown in FIG. 2 and can be attached to a plurality of types of sewing machine arms 3. The sewing machine bed 2a includes a looper (not shown) for supplying a lower thread for forming a double chain stitch together with a needle thread that is passed through the needle. The sewing machine bed 2a of the present embodiment is a shape suitable for forming a tubular portion of clothes (for example, a hem portion of a T-shirt, a cuff, or a torso portion of an underwear) by sewing a so-called “round” fabric. The "cylinder bed".

  The fabric folding device 4 is a device for folding the end portion of the fabric with a predetermined width, and basically includes the same mechanism as that described in Patent Document 1. The cloth folding device 4 includes a substrate portion 41 that is a plate-like body and is disposed substantially parallel to the front surface (front surface) of the sewing machine bed 2a. A guide part 42, a ruler part 43, and an air ejection part 44 are attached to the upper part of the substrate part 41. A drive cylinder 45 for moving the guide portion 42 in the cloth folding device 4 is attached below the substrate portion 41, for example. In addition, the board | substrate part 41 is not essential in this invention, and it can also comprise the fabric folding | folding apparatus 4 without providing the board | substrate part 41. FIG.

  The guide part 42 is a substantially rectangular plate-like body arranged horizontally, and is movable in the left-right direction by the driving force of the driving cylinder 45 located at the lower end of the board part 41. In the present embodiment, an air cylinder that moves in a linear direction is used as the drive cylinder 45, but various drive mechanisms such as a rotary cylinder can be used.

  The ruler 43 is in a block shape and is located to the right of the guide 42. The ruler 43 has an arcuate curved surface 43a on the left side. The air ejection part 44 has two openings in the front-rear direction on the curved surface 43a. Further, two pipes are located on the upper side of the ruler portion 43, one of which is directed to the front side, and the other one tip is directed to the front side and the lower side, The air ejection part 44 is configured. Furthermore, a pipe having a portion extending in the left-right direction is located on the front side of the ruler portion 43, and the tip is directed leftward to constitute the air ejection portion 44. In addition, in FIG. 2, illustration of the air piping connected to the air ejection part 44 is omitted. As indicated by arrows in FIG. 5, the dough C is directed upward on the right side of the guide part 42 and downward along the curved surface 43 a of the ruler part 43 by the air flow F ejected from each air ejection part 44. The folded state is maintained so that the lower part of the guide part 42 is directed leftward. The fabric C is fed to the needle plate 21 in a state in which the folding is held.

  As shown in FIG. 4, the cloth edge cutting device 5 is driven by a fixed knife 51 fixed to the sewing machine bed 2 a side and a sewing machine main shaft (not shown), and is fixed while sliding with respect to the fixed knife 51. And a movable knife 52 that repeatedly rotates the range. The fabric edge cutting device 5 cuts the edge of the fabric fed toward the needle drop portion 21a in a state of being folded by the fabric folding device 4. The cloth edge cutting device 5 is not limited to the combination of the fixed knife 51 and the movable knife 52 as in the present embodiment, and various other configurations can be adopted.

  The suction device 6 includes an intake pipe 61, and an open front end 62 of the intake pipe 61 is disposed so as to face the fabric end cutting device 5. Further, a suction force generation mechanism (not shown) is connected to the proximal end of the intake pipe 61, and the fabric cut by the fabric end cutting device 5 from the distal end portion 62 with negative pressure at least inside the intake pipe 61. A piece, lint, dust, etc. can be sucked.

  The intake pipe 61 is routed around the sewing machine bed 2a as shown in FIGS. As shown in FIG. 3, the intake pipe 61 is positioned so as to extend in the left-right direction at the lower part of the sewing machine bed 2a in a partial section on the front side of the sewing machine bed 2a. The portion extending in the left-right direction of the intake pipe 61 is positioned further below the lower end of the recess 46 formed in the substrate portion 41 as shown in FIG. For this reason, when putting an operator's hand in the recessed part 46, the intake piping 61 does not become obstructive.

  As shown in FIG. 4, the cloth edge part cutting device 5 is disposed on the front side and the left side of the needle drop part 21a in the sewing machine bed 2a. The fabric folding device 4 is arranged on the front side of the fabric end cutting device 5 in the sewing machine bed 2a. In addition, the suction pipe 61 of the suction device 6 is disposed on the front side of the needle drop portion 21a in the sewing machine bed 2a.

  The cloth folding device 4 is configured so that it can be rotated about the supported shaft and moved to the front side with respect to the sewing machine bed 2a because the lower portion of the substrate portion 41 is supported by the shaft. . For this reason, as shown in FIG. 3, the cloth folding device 4 can be separated from the sewing machine bed 2a by opening the base plate 41 with respect to the sewing machine bed 2a. By separating the cloth folding device 4 from the sewing bed 2a in this way, the internal mechanism of the sewing bed 2a located on the front side of the sewing bed 2a and the device attached to the sewing bed 2a can be exposed. It is possible to reduce obstacles when adjusting the tone and performing maintenance. In addition, when actually performing maintenance, other parts that can be opened in the sewing machine bed 2a are also opened.

  In the substrate portion 41, a predetermined range on the right side from the extended position of the needle plate 21 toward the near side is cut out in a substantially rectangular shape in front view so that the upper end is opened. The notched portion is a recess 46. Therefore, the recessed part 46 is open | released in the near direction and the upward direction in the near side rather than the needle drop part 21a. In the present embodiment, the left end of the recess 46 is located further to the left than the left end of the needle plate 21. Further, when the extension position toward the front side of the needle drop portion 21a is used as a reference, the distance to the right end is formed larger than the distance to the left end of the recess 46. For this reason, even if the operator's right hand is located on the right side with respect to the needle drop portion 21a, the right hand can be easily put into the recess 46.

  In the present embodiment, there is an inclined portion 47 that continues to the near side of the recess 46 and descends toward the near side. The inclined portion 47 of the present embodiment has a curved surface that is concave upward. The inclined portion 47 is provided in order to easily guide the operator's hand to the recess 46. In addition, although the inclined part 47 of this embodiment is formed separately from the recessed part 46, not only this but the inclined part 462 can also be formed as a part of recessed part 46. FIG.

  For example, as shown in FIG. 6B, a flat surface portion 461 that is a horizontal surface located behind the concave portion 46, and an inclined flat surface that is continuously located on the near side of the flat surface portion 461 and descends toward the near side. As an example, an inclined portion 462 may be formed. Further, as shown in FIG. 6C, the same flat portion 461 as in FIG. 6B, and an inclined portion 462 is formed as a curved surface that continues to the near side of the flat portion 461 and descends to the near side. Things. In addition, although not illustrated, the inclined portion 462 can be formed in a stepped shape in which a plurality of surfaces that sequentially descend toward the near side are gathered.

  Since the concave portion 46 is formed in the substrate portion 41, the concave portion 46 can be formed together with the cloth folding device 4. For this reason, the recessed part 46 is easy to form. Also, as shown in FIG. 3, by tilting the substrate portion 41 toward the front side during maintenance, the concave portion 46 can be separated from the sewing machine bed 2a and the front side of the sewing machine 1 can be opened widely. For this reason, the trouble at the time of performing maintenance of the sewing machine 1 can be reduced.

  As described above, since the concave portion 46 is formed in the substrate portion 41 of the fabric folding apparatus 4, a space is secured on the right side of the guide portion 42 and the left side of the ruler portion 43 of the fabric folding apparatus 4. Furthermore, a space is also secured in front of the guide part 42 and the ruler part 43. For this reason, the drive mechanism for moving the guide portion, which has been conventionally provided in the sewing machine bed, is unlikely to be an obstacle, and the operator can easily bring his hand close to the needle drop portion 21a.

  In the present embodiment, the concave portion 46 is formed in the substrate portion 41, but the present invention is not limited to this. For example, when the substrate portion 41 is not provided, the recess 46 can be formed in another member constituting the fabric folding apparatus 4, or the recess 46 can be formed in a combination of the substrate portion 41 and another member. it can. Moreover, although the recessed part 46 was made into the shape with which the left end, the right end, and the lower end were closed in this embodiment (side-down substantially U shape or substantially U shape), it is not limited to this, Some end parts May be open (for example, substantially L-shaped).

  In the present embodiment, the drive cylinder 45 of the cloth folding device 4 is attached below the substrate portion 41. That is, since the drive cylinder 45 is positioned below the recess 46, it does not get in the way when the operator brings his hand close to the needle drop portion 21a.

  As described above, in the sewing machine 1 of the present embodiment, the operator can easily bring his hand close to the needle drop portion 21a. Therefore, when the operator sets the cloth folded in two on the needle drop portion 21a, the fabric The position at which sewing is started can be easily adjusted to the needle drop portion 21a, and a reduction in sewing efficiency can be suppressed. This is particularly advantageous when the sewing machine 1 is an industrial sewing machine used for sewing large quantities of clothing.

  Here, as a specific example of the scene where the operator sets the folded fabric in the needle drop portion 21a, the side seam (side stitching portion) of the folded fabric is used as a reference for the side seam before folding. For example, the fabric may be set in accordance with an instruction from a clothing manufacturer regarding whether to place the cloth on one side or the other side.

  A lower end 46a (see FIG. 6A) of the recess 46 is located at a distance H46 from the upper surface of the needle plate 21 in a longitudinal cross section passing through the needle drop portion 21a. That is, the lower end of the concave portion 46 is lower than the position of 1/3 from the top in the vertical distance between the upper surface of the needle plate 21 and the lower end position of the sewing machine bed 2a, and higher than the lower end of the sewing bed. Is located. In the present embodiment, the drive cylinder 45 that drives the guide portion 42 is located below the sewing machine bed 2a. However, even in such a case, in the present embodiment, a height dimension corresponding to a distance H46 that is 1/3 or more of the vertical distance H2a between the upper surface of the needle plate 21 and the lower end position of the sewing machine bed 2a is secured in the recess 46. Therefore, it is possible to secure a space where at least a part of the operator's hand enters the fabric folding device 4. Note that the recess 46 does not have to be formed so that all five fingers in the operator's hand can enter, but only needs to be formed so that only a part of the fingers can enter. Even in this case, it is easier for the operator to bring his hand closer to the needle drop portion 21a as compared with the case where the recess 46 is not formed.

  Specifically, the lower end 46a of the recess 46 is 25 mm to 100 mm downward from the upper surface of the needle plate 21 in the longitudinal cross section passing through the needle drop portion 21a in consideration of the average hand size of the operator. It is said that the position. By setting the lower end of the concave portion 46 at this position, most workers can easily put the hand into the concave portion 46.

  As shown in FIGS. 6B and 6C, when the concave portion 46 has the inclined portion 462, the lower end 462a of the inclined portion 462 as the lower end 46a of the concave portion is the front and rear of the needle drop portion 21a. In the longitudinal cross section, the vertical distance H2a between the upper surface of the needle plate 21 and the lower end position of the sewing machine bed 2a is lower than the position of 1/3 from above, and is higher than the lower end of the sewing machine bed. It is desirable to do so.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to each said embodiment, A various change can be added in the range which does not deviate from the summary of this invention.

  For example, the recess can be formed in the sewing machine bed 2a in addition to the cloth folding device 4. Further, the sewing machine of the present embodiment has a configuration particularly suitable for “round” fabrics, but it is naturally possible to sew flat fabrics, not exclusively for “round” fabrics. For this reason, the sewing machine bed 2a may be a “flat bed” other than the “cylinder bed” as in the present embodiment. Further, the sewing machine 1 of the present embodiment is a multi-needle double chain stitch sewing machine, but it is possible to form the recess 46 in the cloth folding device 4 in various other sewing systems.

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Sewing machine bed unit 2a Sewing machine bed 21 Needle plate 21a Needle drop part 4 Fabric folding device 46 Concave portion 5 Fabric edge cutting device 6 Suction device 61 Intake piping

Claims (6)

A fabric folding device that folds the edge of the fabric is provided in the sewing machine bed,
In the sewing machine in which the cloth folding device is located on the near side of the needle drop portion,
At least the cloth folding device includes a recess that is open toward the front and the upper side on the near side of the needle drop portion.   The lower end of the recess is a longitudinal cross section passing through the needle drop part, and is below the position of 1/3 from above in the vertical distance between the upper surface of the needle plate and the lower end position of the sewing machine bed, and The sewing machine according to claim 1, wherein the sewing machine is located above a lower end of the sewing machine bed. The concave portion has an inclined portion having a shape that descends to the front side in the longitudinal cross section in the front-rear direction,
The lower end of the inclined portion as the lower end of the concave portion is a position that is 1/3 from the top in the vertical distance between the upper surface of the needle plate and the lower end position of the sewing machine bed in the longitudinal cross section passing through the needle drop portion. The sewing machine according to claim 1, wherein the sewing machine is located below and below the lower end of the sewing machine bed.   The lower end of the concave portion is located at a position of 25 mm to 100 mm downward from the upper surface of the needle plate in a longitudinal longitudinal section passing through the needle drop portion. sewing machine.   The sewing machine according to any one of claims 1 to 4, wherein the cloth folding device is configured to be movable toward the front side with respect to the sewing machine bed. A fabric folding device that folds the edge of the fabric is provided in the sewing machine bed,
The fabric folding device, the fabric edge cutting device capable of cutting the edge of the fabric folded during the sewing operation, and the fabric cut by the fabric edge cutting device, in front of the needle drop portion of the sewing machine bed In a sewing machine where a suction device for inhaling a piece is located,
At least the cloth folding device includes a recess that is open toward the front and the upper side on the near side of the needle drop portion.

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