JP5429709B2 - Sewing machine folding back guide device - Google Patents

Description

  In the present invention, for example, when a sewn fabric having a round shape formed by stitching the front and back body parts, such as a T-shirt and underwear, is stitched, the end portion of the round sewn fabric is a needle drop portion. Folding of the sewing machine is configured to fold back at the front side of the sewing machine and to keep the folded back lower fabric portion and upper fabric portion in a predetermined folded state and to guide the feeding to the needle drop portion. The present invention relates to a guide device.

  This kind of sewing machine cloth folding guide device is basically installed at a position before the needle drop part, and a cloth feeding guide plate for guiding the feeding movement of the cloth placed in a horizontal posture in the sewing progress direction; The end portion of the fabric on the fabric feed guide plate is folded back into a passage formed between the lower surface of the fabric feed guide plate and the fixed feed surface, and the folded portion of the folded fabric is one end of the fabric feed guide plate A fixed guide member having a bending guide surface for folding back the fabric end portion that guides the feeding in the sewing progress direction between the edge portion and the edge of the lower fabric portion folded back in the passage. And a fabric edge guide for guiding the feeding of the edge of the folded lower fabric portion in the sewing progress direction.

  By the way, a stepped portion having a thickness larger than that of the other fabric portions is formed at the place where the front and back body parts are sewn together. When the sewing fabric in which such a thick step portion is locally present is sent to the needle drop portion for sewing, the vertical width of the passage formed between the fabric feeding guide plate and the fixed feeding surface is When fixedly set to a size sufficient for the folded lower fabric portion that is thick due to the presence of the stepped portion to pass, the lower folded fabric portion that does not have a stepped portion passes under the passage. A gap is created between the fabric portion and the lower surface of the fabric feed guide plate, so that the lower fabric portion cannot be pressed against the fixed feed surface. Sewing at the width cannot be performed, and it is easy to cause detachment or sewing wrinkles, and the sewing finish deteriorates. On the other hand, when the vertical width of the passage is fixedly set to be equal to or substantially equal to the thickness of the thin folded lower fabric portion having no stepped portion, the folded lower fabric portion whose thickness is increased due to the presence of the stepped portion Even if it is not transferred into the passage, or even if it is transferred, the lower fabric portion may not pass through the passage smoothly and may be clogged in the passage, so that a predetermined sewing cannot be performed at all.

  Therefore, conventionally, when sewing a fabric having a thick fabric portion due to the presence of a stepped portion and a thin fabric portion without a stepped portion, the vertical width of the passage depends on the thickness of the fabric portion passing through the passage. Can be automatically changed, a thin plate-like movable member is arranged on the lower surface side of the cloth feed guide plate, and this movable member is attached to the lower surface of the cloth feed guide plate via an elastic member such as sponge rubber. The present applicants have already proposed an elastic support that can move up and down (see, for example, Patent Document 1).

  According to the conventional sewing machine cloth folding back guide device proposed by the present applicants in Patent Document 1, the movable member is elastically pushed downward in the normal state, and the vertical width of the passage is thin with no stepped portion. The value corresponding to the thickness of the fabric portion is maintained, and in this state, when the fabric portion having a large thickness is transferred into the passage due to the presence of the stepped portion, the movable member resists elasticity and moves upward by the increase in thickness. It moves so as to increase the vertical width of the passage. As a result, regardless of the change in the thickness of the fabric portion that passes through the passage, the fabric portion is pressed against the fixed feed surface by the movable member to ensure the feed guide function in a predetermined folded state at all times. A reliable and stable stitching can be obtained.

Japanese Patent No. 4061424

  However, in the conventional cloth folding back guide device disclosed in Patent Document 1, a thin plate-like movable member is supported on the lower surface side of the cloth feed guide plate so as to be movable up and down via an elastic member such as sponge rubber. Because of this configuration, the number of parts is large, and not only is the structure and assembly complicated, but the elastic member that repeatedly expands and contracts in response to the change in the thickness of the lower fabric portion can be realized early. In addition to being easily deteriorated (sagging), the thin plate-like movable member is also easily deformed, and the durability of the component that responds vertically according to the thickness of the folded lower fabric portion is poor. Therefore, when used over a long period of time, the response performance to the change in the thickness of the folded lower fabric portion is reduced, and the fabric portion passing through the passage cannot be reliably stopped from moving up and down and left and right, and as a result, the fabric However, the feeding guide in the folded state is not stable, and there remains a problem that the function of preventing the occurrence of detachment, sewing wrinkles, etc. is impaired at an early stage. In order to compensate for the decrease in response performance, it is conceivable to replace the movable member and the elastic member with new ones every certain period of use. In this case, however, an increase in running cost is inevitable.

  The present invention has been made in view of the above circumstances, and not only can the number of parts be reduced, but also the durability of the component parts can be improved and the response performance to changes in the thickness of the folded fabric portion can be maintained appropriately and satisfactorily over a long period of time. An object of the present invention is to provide a cloth folding back guide device for a sewing machine that can be used.

In order to achieve the above object, a cloth folding back guide device for a sewing machine according to the present invention is installed at a location before a needle drop portion and guides a feed movement in a sewing progress direction of a cloth placed in a horizontal posture. The fabric feed guide plate and the end portion of the fabric on the fabric feed guide plate are folded back into a passage formed between the lower surface of the fabric feed guide plate and the fixed feed surface, and the folded portion of the folded fabric is set as the fabric. A fixed guide member having a bending guide surface for folding the fabric end portion for guiding the feed in the direction of sewing sandwiched between one edge portion of the feed guide plate, and an edge of the lower fabric portion folded back in the passage In the fabric folding guide apparatus for a sewing machine, the fabric feeding guide plate having rigidity, the fabric edge guiding device includes a fabric edge guide for contacting the edge of the folded lower fabric portion in contact with the fabric in the sewing progress direction. Composed of material and said Edge portion is formed on the inclined positioned progressively above the fixed feeding surface as the tip, the dough feed guide plate, the the position side of the fixed guide member is formed on the opposite other end of the And a spring member that elastically oscillates and biases the vertically movable dough feeding guide plate downwardly and is supported by the lower side that is folded back into the passage. Depending on the thickness of the fabric portion, the fabric feed guide plate swings downward by the elastic biasing force of the spring member, or swings upward against the elastic biasing force to automatically adjust the vertical width of the passage. It is characterized by being configured to increase or decrease.

In fabric fold guiding device of a sewing machine according to the present invention, the spring member, as claimed in claim 2, there is a coil spring which is wound around the outer circumference of the shaft for supporting the dough feed guide plate vertically swingably It is preferable.

In the cloth folding guide device for a sewing machine according to the present invention, as described in claim 3 , the cloth feeding guide plate and the fixed guide member are fed toward the passage in a folded state before the cloth feeding guide plate and the fixed guide member. A curl correcting member is provided to remove the curl formed at the end of the folded lower fabric portion by sliding contact with the lower surface of the lower fabric portion, and the curl correcting member is provided on the lower surface of the folded lower fabric portion. It is preferably biased so as to be elastically slidably held so that the lower surface of the folded lower fabric portion is held substantially flush with the fixed feed surface .

  According to the cloth folding back guiding device of the sewing machine according to the present invention having the above-described characteristic configuration, the cloth feeding guide plate for guiding the feeding movement of the cloth in the sewing progress direction is provided on the one end (other end) side thereof. The fabric feed guide plate itself is turned up and down by the elastic biasing force of the spring member or against the elastic biasing force according to the thickness of the lower fabric portion. Thus, the vertical width of the passage can be automatically increased or decreased, so that a thin plate-like movable member that moves up and down according to the thickness of the fabric portion is provided separately from the fabric feed guide plate. Compared to the conventional apparatus, the number of parts can be reduced, the structure can be simplified, the assembly can be facilitated, and the cost can be reduced.

Moreover, the folded back fabric portion is made up of the fabric feed guide plate itself that moves up and down corresponding to the thickness of the folded lower fabric portion, and is thick and does not deform when contacted with the fabric. The vertical response performance with respect to the change in thickness of the component can be maintained appropriately and satisfactorily over a long period of time, and the durability of the component can be improved. Therefore, it is possible to reliably prevent the fabric portion passing through the passage from moving up and down and to the left and right regardless of its thickness, and to stably feed and guide the lower fabric portion in the folded state. The prevention function can be ensured over a long period of time .

In addition , the dough feed guide plate is made of a material having rigidity, and one end edge of the dough feed guide plate is formed in an inclined shape that is gradually located above the fixed feed surface, so that there is a stepped portion. Thus, there is an effect that the transfer of the lower fabric portion having a large thickness into the passage can be performed reliably and smoothly without causing clogging or the like.

  In addition, as a spring member that elastically swings and biases the fabric feed guide plate downward, a coil spring wound around the outer periphery of a shaft that becomes the swing center of the fabric feed guide plate is used. It is possible to easily and compactly configure the support structure for vertically swinging.

  In addition, it is formed at the end of the folded lower fabric portion in sliding contact with the lower surface of the lower fabric portion fed toward the passage in a folded state at a position before the fabric feeding guide plate and the fixed guide member. By providing a curl correction member that removes the curl, the curl formed at the end of the folded lower fabric part is still bent to the lower surface side of the fabric part, and the lower fabric part is transferred into the passage. Thus, it is possible to reliably prevent the occurrence of defective finishing such that the sewing is performed with the curl present.

It is a schematic perspective view which shows the principal part of the fabric folding | turning guide apparatus of the sewing machine which concerns on this invention. It is a front view of the principal part of a cloth folding back guide device of the sewing machine same as the above. It is a disassembled perspective view of the principal part of the cloth folding back guide apparatus of a sewing machine same as the above. It is an enlarged front view of the principal part which shows the state in which the thin cloth | dough part has passed the channel | path of the cloth folding back guide apparatus of a sewing machine same as the above. It is an enlarged front view of the principal part which shows the state in which the thick cloth | dough part has passed through the channel | path of the cloth folding back guide apparatus of a sewing machine same as the above. It is an enlarged bottom view of the principal part explaining the effect | action of the curl correction member in the cloth | folding back | turnback guide apparatus of a sewing machine same as the above.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view showing a main part of a cloth folding back guide device for a sewing machine according to the present invention, FIG. 2 is a front view of the main part, and FIG. 3 is an exploded perspective view of the main part. In FIG. 1, reference numeral 21 denotes a needle attached to a lower end portion of a needle bar 22 supported by a tip end portion of a sewing machine arm (not shown) so as to be capable of driving reciprocating up and down via a needle stopper 23. Reference numeral 24 denotes a needle plate having a needle drop portion that falls into a penetrating state when the needle 21 is lowered. The needle plate 24 is fixed in a horizontal position on the upper surface of the sewing machine bed 25 that accommodates parts constituting sewing such as a looper and a fabric feed mechanism (these are well-known and will not be described or illustrated). Yes. Reference numeral 26 denotes a presser foot attached to a lower end portion of a presser bar 27 which is supported at the tip end portion of the sewing machine arm so as to be movable up and down.

  Reference numeral 28 denotes a cloth folding back guide device installed at a needle drop portion of the needle plate 24 and a position before the presser foot 26. As clearly shown in FIGS. 2 to 5, the fabric folding guide device 28 places the circular fabric W to be sewn in a horizontal posture and feeds the fabric W in the sewing progress direction X. A material feed guide plate 1 for guiding the end portion of the fabric W on the feed guide plate 1 and a fixed feed surface 3 on the upper surface of the rail member 2 fixed to the sewing machine bed 25. Folded to the passage 4 formed between them, and the wrapping portion Wa of the folded fabric W is sandwiched between one end edge portion 1a of the fabric feed guide plate 1 to guide the feed in the sewing progress direction X. A fixed guide member 5 having a bent guide surface 5a for folding the fabric end portion, and a position adjustment in the front side surface of the rail member 2 in a direction perpendicular to the sewing progress direction X through a long hole 6a and a fixing screw 6b. Lower fabric part that is fixed and folded back to the passage 4 And a cloth edge guide 7 for guiding the feeding of the sewing traveling direction X of contact with 該折-back lower fabric portions Wu edge to edge of Wu.

  The fabric feed guide plate 1 is made of a material having high rigidity, and the one end edge 1a of the fabric feed guide plate 1 is fixed so as to approach the tip, that is, the bending guide surface 5a of the fixed guide member 5. It is formed in an inclined shape located gradually above the feed surface 3.

  The other end 1b of the dough feed guide plate 1 is bent downward at a right angle, and the other end 1b is fitted into a rail groove 2a formed on the upper surface of the rail member 2. A pin shaft 10 having an axial center along the sewing progress direction X is provided at the tip of a sliding plate 9 slidably driven in a direction YY perpendicular to the sewing progress direction X via the air cylinder 8. Via a screw 12 to a bracket 11 that is swingably mounted around its axis. With the above-described configuration, the cloth feed guide plate 1 has the inclined end edge 1a close to the bending guide surface 5a of the fixed guide member 5 by the reciprocating drive sliding of the slide plate 9 by the air cylinder 8. Can be switched between a position for performing the dough feeding guide action and a position where the inclined one end edge portion 1a is separated from the bending guide surface 5a of the fixed guide member 5 and the circular dough W is placed and set on the upper surface. It is comprised and is supported so that it can rock | fluctuate up and down around the axial center of the said pin shaft 10 formed in the other end part side.

  A coil sbling 13 as a spring member is wound around the outer periphery of the pin shaft 10. One end of the coil spring 13 is engaged with the bracket 11, and the other end is engaged with the tip of the sliding plate 9. Thus, the dough feed guide plate 1 is elastically urged to swing downward via a coil spring 13. With the above configuration, the fabric feed guide plate 1 swings downward by the elastic biasing force of the coil spring 13 or the coil spring 13 according to the thickness of the lower fabric portion Wu folded back into the passage 4. The upper and lower widths H of the passage 4 are automatically increased or decreased by swinging upward against the elastic urging force.

  In addition, as shown in FIG. 6, the cloth feeding guide plate 1 and the fixed guide member 5 are in sliding contact with the lower surface of the lower fabric portion Wu fed toward the passage 4 in a folded state, as shown in FIG. A curl correction member 14 having a thin spatula shape with a substantially triangular plane is provided to remove curls Wc formed by the end of the lower fabric portion Wu rising in the direction opposite to the folding direction. The curl correcting member 14 is attached to the front side surface of the rail member 2 at its base end portion 14a via a screw 15 so as to be swingable up and down, and is fixed to the front side surface of the rail member 2. The upper lower limit of the swinging range limited by the frame 16, that is, the position where the upper surface of the curl correction member 14 is substantially flush with the fixed feed surface 3, and the lower lower fabric portion Wu via the spring 17. The lower surface of the folded lower fabric portion Wu is urged so as to be in a state of being flush with the fixed feed surface 3 while being elastically slidably contacted with the lower surface.

  The upper limit position of the swing of the curl correction member 14 by the U-shaped frame 16 can be adjusted by changing the vertical position of the pair of upper and lower bolts 18. Further, the position of the fixed guide member 5 is also adjustable via a slide member 19 fixed to the back side of the fixed guide member 5.

  Next, a step having a thickness larger than the thickness of the other portion (thickness equivalent to one piece of fabric) is formed by stitching the front and back body parts using the fabric folding back guide device 28 of the sewing machine configured as described above. The operation of hem-stitching a circular sewing fabric such as a T-shirt that has been used will be described.

  With the presser foot 26 raised, after placing the circular sewing material W in a horizontal posture on the material feed guide plate 1 moved to the material setting position, the fabric feed guide plate 1 is moved to the air cylinder. 8 and the sliding plate 9 are moved to a position where the inclined one end edge portion 1a is close to the bending guide surface 5a of the fixed guide member 5 and performs a predetermined cloth feed guide action. By this movement, one end portion of the circular sewing cloth W is folded back to the passage 4 below the feed guide plate 1 along the bending guide surface 5a of the fixed guide member 5.

  Next, the presser foot 26 is lowered to press the sewing fabric W from above. In this state, when the operation pedal (not shown) is depressed to rotate the sewing machine, the sewing fabric W is moved toward the needle drop portion along the upper surfaces of the fixed feed surface 3 and the needle plate 24 by the fabric feed mechanism. Sent to X sequentially. At this time, the folded portion Wa of the sewing fabric W is sandwiched between the inclined one end edge portion 1a of the feed guide plate 1 and the bending guide surface 5a of the fixed guide member 5 to guide the feed in the sewing progress direction X. At the same time, the end edge of the lower fabric portion Wu turned back to the passage 4 is brought into contact with the fabric guide 7 so that the feed in the sewing progress direction X is slidably guided. Then, when the sewing fabric W reaches the needle drop portion, a predetermined hem sewing is performed by the cooperative action of the needle 21 and the looper.

  At the time of the hemline sewing as described above, during the normal time when the folded lower fabric portion Wu having a small thickness t and no stepped portion is formed in the sewing fabric W passes through the passage 4, as shown in FIG. The guide plate 1 is swung downward around the pin shaft 10 by the elastic biasing force of the coil spring 13, and the vertical width H of the passage 4 becomes equal to the thickness t of the folded lower fabric portion Wu. Wu is elastically pressed against the fixed feed surface 3 by the feed guide plate 1. As a result, the thin folded lower fabric portion Wu is prevented from moving up and down or left and right, and the folded lower fabric portion Wu is stably fed and guided toward the needle drop portion.

  On the other hand, when the folded lower fabric portion Wu ′ whose thickness t1 is increased due to the presence of the step portion passes through the passage 4, the fabric feed guide plate 1 is elastically biased by the coil spring 13, as shown in FIG. Against this, the vertical width H of the passage 4 is automatically increased by swinging upward around the pin shaft 10 by the increase in thickness (t1-t), and the folded lower fabric portion Wu. 'Is elastically pressed against the fixed feed surface 3 by the feed guide plate 1. As a result, the thicker folded lower fabric portion Wu ′ is prevented from moving freely in the vertical direction, and the folded lower fabric portion Wu ′ smoothly passes through the passage 4 and is stably directed toward the needle drop portion. To be guided.

  As described above, the vertical radiation of the passage 4 is automatically increased / decreased in accordance with the change in thickness due to the presence / absence of the stepped portion of the sewing fabric W, so that the front and back body parts such as “T-shirts and underwear” The thickness of the folded lower fabric portion that passes through the passage 4 even when a round fabric having a step larger than the thickness of the other fabric portion is locally stitched at the stitching location. Regardless of the change of the cloth, it is possible to prevent the play of the lower fabric portion and to feed and guide the entire sewing fabric W always in a predetermined folded state, so that there is no occurrence of disengagement or sewing wrinkles. Further, the hem sewing fabric W can be hem-sewn reliably and stably over the entire circumference.

  The component for automatically increasing or decreasing the vertical width of the passage 4 in response to the change in the thickness of the folded lower fabric portion Wu is a fabric supported so as to be swingable up and down around the axis on the other end side. Since the feed guide plate 1 and the coil spring (spring member) 13 that swings and biases the fabric feed guide plate 1 downward may be used, another thin plate-like movable member is provided on the lower surface side of the fabric feed guide plate 1. The number of parts is reduced compared to a conventional fabric folding back guide device in which this movable member is elastically supported by an elastic member such as sponge rubber on the lower surface of the fabric feed guide plate so as to be vertically movable. As a result, the structure can be simplified, the assembly can be facilitated, and the cost can be reduced.

  In addition, the component that moves up and down in response to the thickness of the folded back fabric portion is thick, highly rigid, and does not deform when contacted with the fabric itself. Therefore, the response performance of the vertical movement with respect to the change in the thickness of the folded fabric portion can be maintained appropriately and satisfactorily for a long time, and the durability of the component can be improved. As a result, regardless of the thickness of the folded lower fabric portion passing through the passage 4, the fabric portion can be surely prevented from moving up and down or left and right, and the folded fabric lower fabric portion can always be fed stably and guided. The function of preventing the occurrence of disengagement or sewing wrinkles can be reliably maintained over a long period of time.

  Further, as shown in the above embodiment, the lower side of the lower fabric portion Wu that is fed toward the passage 4 in a folded state is placed in front of the fabric feed guide plate 1 and the fixed guide member 5. The end of the folded lower fabric portion Wu is provided by providing a thin spatula-shaped curl correction member 14 for removing the curl Wc formed in contact with the end portion of the lower fabric portion Wu in a direction opposite to the folded direction. The curl Wc formed in the portion is transferred to the passage 4 while being bent on the lower surface side of the lower fabric portion Wu, and as a result, the hem is sewn while the curl Wc is present. Can be reliably prevented.

  Furthermore, the curl correction member 14 is elastically slidably contacted with the lower surface of the folded lower fabric portion Wu via a spring 17 so that the lower surface of the folded lower fabric portion Wu is flush with the fixed feed surface 3. By urging to hold, it becomes possible to smoothly guide the lower fabric portion Wu after the curl Wc is removed into the passage 4 without being caught and the finish is further improved. Hemming can be performed.

  In the above embodiment, a coil spring 13 wound around the outer periphery of the pin shaft 10 is used as a spring member that swings and biases the dough feeding guide plate 1 around the pin shaft 10. In this case, the support structure for swinging the dough feed guide plate 1 up and down can be configured simply and compactly. However, instead of such a coil spring 13, for example, a portion connected to the sliding plate 9 and A configuration may be employed in which a tension spring is stretched between the dough feed guide plate 1 and the dough feed guide plate 1 is swung downward.

DESCRIPTION OF SYMBOLS 1 Material feed guide plate 1a Inclined one end edge 3 Fixed feed surface 4 Passage 5 Fixed guide member 5a Bending guide surface 7 Material edge guide 10 Pin shaft 13 Coil spring (an example of a spring member)
14 Curl correction member 28 Fabric folding guide device W Sewing fabric Wu Folding lower fabric portion Wc Curl X Sewing direction

Claims (3)

A fabric feed guide plate that is installed in front of the needle drop section and guides the feed movement of the fabric placed in a horizontal posture in the sewing progress direction, and the fabric end portion on the fabric feed guide plate Fold back in the passage formed between the lower surface of the feed guide plate and the fixed feed surface, and feed the folded fabric folded portion between the one end edge of the fabric feed guide plate in the sewing progress direction. A fixed guide member having a bending guide surface for folding the cloth edge portion to be guided, and feeding the edge of the folded lower cloth portion in the direction of sewing by contacting the edge of the lower cloth portion folded in the passage. In the cloth folding back guide device of the sewing machine provided with the cloth edge guide for guiding
The dough feed guide plate is made of a material having rigidity, and the one end edge portion is formed in an inclined shape that is gradually located above the fixed feed surface toward the tip,
The dough feed guide plate, said with the position side of the fixed guide member is supported vertically swingably about an axis which is formed on the opposite other end of the upper and lower pivotable dough feed guide A spring member that elastically swings and biases the plate downward is provided, and the fabric feed guide plate swings downward by the elastic biasing force of the spring member according to the thickness of the lower fabric portion folded back in the passage. A sewing machine cloth folding back guide device which is configured to move or swing upwardly against an elastic biasing force to automatically increase or decrease the vertical width of the passage. The sewing machine cloth folding back guide device according to claim 1, wherein the spring member is a coil spring wound around an outer periphery of a shaft that supports the cloth feed guide plate so as to swing up and down. In front of the dough feed guide plate and the fixed guide member, a slidable contact with the lower surface of the lower fabric portion fed toward the passage in the folded state is formed at the end of the folded lower fabric portion. A curl correction member that removes curl is provided ,
The curl correcting member is urged so as to elastically slidably contact the lower surface of the folded lower fabric portion and hold the lower surface of the folded lower fabric portion substantially flush with the fixed feed surface. Item 3. A sewing machine cloth folding guide apparatus according to Item 1 or 2 .

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