JP4105734B2 - Sewing machine code guidance device - Google Patents

Description

  The present invention relates to an apparatus for guiding a cord from a supply source to a work cloth in a sewing machine.

  As a method for sewing the decorative cord, there are a loop sewing that is sewn on a work cloth in a state where the cord is looped, and a cord sewing that is sewn on the work cloth in a state where the cord is extended (constricted). As a code guide device used for loop sewing, a technique described in Patent Document 1 is known. This conventional apparatus includes a presser foot that is held on the work cloth in a state where the cord is looped, and a guide member that guides the cord immediately before the presser foot (see FIG. 8 of the same document). The guide member moves up and down in conjunction with the needle bar of the sewing machine, guides the presser foot through the insertion hole with the cord lying down when descending, and does not clamp the cord between the presser foot and the lower part of the presser foot. A loop is formed on the side (see paragraph number 0007 of the same document).

As a code guide device used for cord sewing, a technique described in Patent Document 2 is known. This conventional apparatus includes a cord holder that holds a cord on a work cloth in an extended state, a cord guide in which two guide holes are formed immediately before and immediately above the cord holder, and a vertical line that connects the upper and lower guide holes. And a swing-out member in which a cord through hole is formed at the apex of a horizontal triangle with the base as the base (see FIG. 3 of the same document). The swinging member moves up and down in conjunction with the needle bar, and guides the cord in a natural state so that excessive tension does not act on the cord (see paragraph number 0035 of the same document).
Japanese Patent Laid-Open No. 9-31826 JP-A-8-170264

  However, according to the conventional device of Patent Document 1, since the guide member pulls down the cord when the needle bar is lowered, the cord is less slack on the supply source side than the guide member, and in this state, the needle bar is raised. Then, the loop is tightened and contracted by the guide member, and the size of the loop may become uneven. Further, according to the conventional device of Patent Document 2, since the cord is restrained by the two guide holes before and after the swinging member, when the needle bar is raised, the pulling amount of the cord by the swinging member becomes insufficient, and the cord holder On the underside, the cord slackened and meandered, and the appearance of the cord line sometimes deteriorated.

  Therefore, the first reference problem is that when loop sewing is performed, the cord is sufficiently pulled out from the supply source when the needle bar is lowered, and the drawn cord is loosened when the needle bar is raised, thereby preventing the loop from shrinking during sewing. The object is to provide a code guide device for a sewing machine. A second reference problem is to provide a cord guide device for a sewing machine that can slacken the cord when the needle bar is lowered and pulls the slack cord when the needle bar is raised to prevent meandering of the cord. . A third reference problem is to provide a cord guide device for a sewing machine that can be used for both loop sewing and cord sewing by changing the order of passing the cords.

  Then, the object of the present invention is to allow the cord presser to smoothly get over the already sewn cord when the cord is overlapped and sewn at the same position, so that the entire cord holder can be manufactured at low cost by sheet metal processing. To do. In addition, the operator can easily see the cord through hole in the bottom wall, and can easily and accurately position the cord through hole in the needle drop hole.

In order to solve this problem, a cord guide device according to the present invention is a cord guide device for a sewing machine used for cord sewing. A cord holder (72) is attached to the lower end of a lifting shaft (35), and the cord holder (72) A cord presser (124) is provided at the lower end, and the pair of opposed upright walls (125, 126) and the bottom wall (127) are folded on the cord presser (124) by sheet metal processing so as to form a U-shape with an open top surface. It is bent and one side of the standing wall (125) and the bottom wall (127) is provided with a cord passage hole (128, 129), and both the standing walls (125, 126) are inverted trapezoids that become narrower toward the bottom. It is formed.
Here, the cord through holes (128, 129) are rounded on the periphery of the entrance / exit portion by buffing so that the cord can be smoothly passed and guided, and the cord through holes are formed in the central portion of the standing wall (126). It can be set as the structure provided with the notch part (131) which lets the string buff for grinding | polishing of (129) pass.
In addition, the cord passage hole (129) of the bottom wall (127) may be configured such that the upper side is tapered and the lower side is formed with a small diameter.
In addition, the bottom wall (127) may be configured such that the lower surface is mirror-finished by buffing and the periphery is rounded to reduce friction with the cord or work cloth.

  In order to solve the first reference problem, the cord guiding device of the present invention is a device for guiding a cord from a supply source to a work cloth in a sewing machine, and a bracket is attached to the frame of the sewing machine, and the bracket is moved up and down. A shaft and a code guide are provided, a loop holder that holds the work cloth in a state where the cord is looped is attached to the lifting shaft, a guide hole that guides the cord between the supply source and the loop holder is formed in the code guide, The needle bar of the sewing machine is provided with a balance member for raising and lowering the cord on the supply source side from the guide hole.

  In order to solve the second reference problem, a cord guiding device of the present invention is a device for guiding a cord from a supply source to a work cloth in a sewing machine, wherein a bracket is attached to a frame of the sewing machine, and a lifting shaft is attached to the bracket. A cord guide is provided, and a cord holder for holding the work cloth in a state where the cord is extended to the lifting shaft is attached, a guide hole for guiding the cord between the supply source and the cord holder is formed in the cord guide, and the needle of the sewing machine The bar is provided with a balance member for raising and lowering the cord on the side of the cord holder from the guide hole.

  In order to solve the third reference problem, a cord guiding device of the present invention is a device for guiding a cord from a supply source to a work cloth in a sewing machine, wherein a bracket is attached to a frame of the sewing machine, and a lifting shaft is attached to the bracket. A cord guide is provided, and on the lifting shaft, a loop holder that is held on the work cloth in a state where the cord is looped, and a cord holder that is held on the work cloth in a state where the cord is extended are attached in a replaceable manner. A first guide hole for guiding the cord between the supply source and the loop holder and a second guide hole for guiding the cord between the supply source and the cord holder are formed, and the first guide hole is formed in the needle bar of the sewing machine. A balance member for raising and lowering the cord is provided between the first guide hole and the second guide hole.

In the above code guide device, the following means can be preferably employed.
(1) Attach the cord guide to the bracket so that the cord tension at the time of sewing can be adjusted according to the type of cord.
(2) A bracket is attached to the sewing machine frame so as to be rotatable around an axis parallel to the needle bar so that the loop holder and the cord holder can be retracted from the sewing portion when not in use.
(3) From the same viewpoint, attach the bracket to the sewing machine frame so that it can be raised and lowered.
(4) The guide hole of the cord guide and the balance hole of the balance member are formed so as to open in the vertical plane so that the cord can be smoothly guided with a small resistance.
(5) In this case, the balance member is provided so as to be rotatable around the axis of the needle bar so that the distance between the code guide and the balance member can be adjusted.

(6) In order to obtain a cord tension according to the thickness of the cord at the time of loop sewing, a plurality of large and small cord passage holes are formed in the loop holder, and the loop holder is provided so as to be rotatable around the axis of the lifting shaft. .
(7) A member for adjusting the upper limit position of the lifting shaft is provided so that the size of the loop can be adjusted.
(8) A spring member is provided on the bracket to urge the lifting shaft upward so that the loop holder can be driven using the presser foot of the sewing machine. When the needle bar is lowered, the loop holder is lowered with the presser foot. When the needle bar is raised, the loop holder is raised by the restoring force of the spring member.

(9) In a cord guide device used for loop stitching or cord stitching, a base is attached to the sewing machine frame, and the bracket is pivoted to the base between the use position approaching the needle bar along the vertical axis and the non-use position spaced apart from the needle bar. Means for supporting and holding the bracket in the non-use position and means for holding the bracket in the use position, the means for holding the bracket in the use position includes a leaf spring, and the leaf spring is either the bracket or the base It is attached to either side, the operation part is formed at the free end of the leaf spring, the bent part is provided in the middle of the leaf spring, the protrusion is provided on either the bracket or the base, and the bent part is deformed to the leaf spring. A locking hole that is forcibly fitted to the protrusion in the state is formed.

  According to the above configuration, when the cord is not sewn, the loop holder or the cord holder is retracted from the sewing location by holding the bracket in the non-use position, and normal sewing is performed without being hindered by these. be able to. When the cord is sewn, the loop holder or the cord holder can be positioned at the sewing location by holding the bracket in the use position. In this case, by forcibly fitting the locking hole of the leaf spring to the protrusion, the bracket can be firmly locked to the base by a simple operation, and the loop holder or the cord holder can be accurately positioned and held at the sewing location. .

(10) In a cord guide device used for loop sewing or cord sewing, a block is attached to a bracket, a lifting shaft is supported on the block, a loop holder or a cord holder is attached to the lower end of the lifting shaft, and a pin is attached to an intermediate portion of the lifting shaft A slit is formed in the bracket so that the upper end closes and the lower end opens, and the pin is fitted to the slit so that it can be raised and lowered. A fulcrum part located above the fulcrum part and a movable part rotatable about the fulcrum part in the width direction of the slit are provided, and the movable part is fixed to the block with a bolt.

  According to the above configuration, when there is a processing error in the pin or the slit, or when they are worn with long-term use, the movable part is rotated, and the slit is deformed so that the lower end is closed, The backlash around the axis of the lifting shaft can be easily eliminated. Accordingly, the cord through hole of the loop holder or the cord holder can be accurately aligned with the needle drop hole of the sewing machine, and the cord can be sewn with a good appearance. Especially in the case of loop sewing, the noise caused by the high-speed operation of the lifting shaft can be reduced. It becomes possible to suppress.

(11) In a cord guide device used for both loop sewing and cord sewing, a lifting shaft is supported on a bracket, a loop holder and a cord holder are attached to a lower end of the lifting shaft in a replaceable manner, and a pin is attached to an intermediate portion of the lifting shaft The coil portion of the torsion coil spring is held on the bracket, the movable portion of the torsion coil spring is hooked on the pin, and the fixed portion of the torsion coil spring is hooked on the bracket.

  According to the above configuration, the loop holder can be biased upward by hooking the movable part of the torsion coil spring to the pin from below, and the movable part of the torsion coil spring can be hooked to the pin from above. The cord holder can be biased downward. Therefore, one spring component can be used for both loop sewing and cord sewing. In addition, since the coil part is held by the bracket, the torsion coil spring can shorten the lifting shaft compared with the case where the compression coil spring is inserted into the lifting shaft, and can promote downsizing and weight reduction of the device. There is no need to remove the lifting shaft when changing the code sewing specifications. In addition, it is preferable to use a torsion coil spring as the spring member of (8) above in that the lifting shaft can be shortened.

(12) In a cord guide device used for cord sewing, a lifting shaft is supported on a bracket, a cord holder is attached to the lower end of the lifting shaft, a cord presser is provided on the lower end of the cord holder, and a pair of opposing cord pressers The standing wall and the bottom wall are bent by sheet metal processing so as to form a U shape with an open upper surface , and a cord passage hole is provided in one of the standing wall and the bottom wall, and both the standing walls are made narrower toward the lower side. The reverse trapezoid is formed.

  According to the above configuration, since the standing wall of the cord presser is formed in an inverted trapezoidal shape, the cord presser smoothly gets over the already sewn cord when the cord is sewn in the same position. For this reason, it is not necessary to form the cord presser in a cup shape, and the entire cord holder can be manufactured at low cost by sheet metal processing. Further, since the upper surface and the two side surfaces of the cord presser are open, the operator can easily see the cord passage hole in the bottom wall, and this can be easily and accurately positioned in the needle drop hole.

  According to the present invention, since the upright wall of the cord presser is formed in an inverted trapezoidal shape, the cord presser smoothly gets over the already sewn cord when the cord is overlapped and sewn at the same position. For this reason, it is not necessary to form the cord presser in a cup shape, and the entire cord holder can be manufactured at low cost by sheet metal processing. Further, since the upper surface and the two side surfaces of the cord presser are open, the operator can easily see the cord passage hole in the bottom wall, and this can be easily and accurately positioned in the needle drop hole.

In a cord guide device for a sewing machine used for cord sewing, a cord holder (72) is attached to the lower end of the lifting shaft (35), a cord presser (124) is provided on the lower end of the cord holder (72), and the cord presser (124) is provided. The pair of upstanding walls (125, 126) and the bottom wall (127) facing each other are bent by sheet metal processing so as to form a U-shape with the upper surface open , and one of the standing walls (125) and the bottom wall (127 ) Are provided with cord through holes (128, 129), and both standing walls (125, 126) are formed in an inverted trapezoidal shape that becomes narrower toward the lower side.
The cord through holes (128, 129) are rounded on the periphery of the entrance / exit portion by buffing so that the cord can be smoothly passed and guided, and the cord through holes (129) are formed at the center of the standing wall (126). A notch (131) is provided through which the polishing string buff is passed.
The cord through hole (129) of the bottom wall (127) is formed with a taper on the upper side and a small diameter on the lower side.
The bottom wall (127) has a mirror-finished bottom surface by buffing and a rounded chamfered edge to reduce friction with the cord and work cloth.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 5 show a first embodiment of a code guiding device in an embroidery sewing machine. The head frame 1 of the embroidery sewing machine is provided with a plurality of needle bars 2 and a presser bar 3 so as to be movable up and down. A needle 4 is attached to the lower end of the needle bar 2 via a needle stopper 5, and a presser foot 6 is attached to the lower end of the presser bar 3. The presser foot 6 positioned at one end of the head frame 1 (the left end in FIG. 1) is divided into a base portion 6a and a foot portion 6b, and the foot portion 6b is removably assembled to the base portion 6a with screws 7. In FIG. 4, for the sake of convenience, the illustration of the presser foot 6 (although it exists) is omitted.

  The head frame 1 is covered with a thread holding apron 9, and the apron 9 is provided with the same number of upper thread guides 10 as the needle 4 (see FIG. 2). A yarn feeder 11 is installed behind the head frame 1, and a cone 12 that is a supply source of the upper thread T and a cone 13 that is a supply source of the cord C are juxtaposed on the yarn feeder 11. Yes. A needle plate 15 and a shuttle 16 are provided on the bed 14 of the embroidery sewing machine, and a bobbin (not shown) as a lower thread supply source is stored in the shuttle 16. At the time of loop sewing, the cord C is guided from the cone 13 to the sewing portion of the work cloth W by the cord guiding device 21 and is sewn in a loop shape by the needle 4 using the upper thread T and the lower thread.

  The base 22 of the cord guiding device 21 is attached to one end of the head frame 1 via the thread holding apron 9 with screws 23, 24, and 25 (see FIG. 2). The base 22 is formed with a through hole 26 for exposing the upper thread guide 10 and a hanging portion 28 for supporting a longitudinal axis 27 parallel to the needle bar 2. On the vertical axis 27, a bracket 29 is rotatably supported by a U-shaped portion 30, and a use position approaching the needle bar 2 (solid line position in FIG. 2) and a non-use position away from the needle bar 2 (FIG. 2). The position of the chain line). A block 31 (see FIG. 4) is fixed to the bracket 29 by two upper and lower through bolts 32 and 33, and a lifting shaft 35 is supported on the block 31.

  A loop holder 37 is attached to a lower end portion of the elevating shaft 35 through a shaft holder 38 so that the height and rotation of the loop holder 37 can be adjusted. The loop holder 37 includes one cord passage hole 40 in the shin portion 37a and three large and small cord passage holes 41 in the foot portion 37b, and the work cloth W with the cord C looped below the foot portion 37b. It is comprised so that it may hold | maintain at the sewing location. A pin 42 projects from an intermediate portion of the lifting shaft 35, a slit 43 into which the pin 42 is fitted, and a torsion coil spring (winding spring) 44 that biases the lifting shaft 35 upward via the pin 42. Is provided.

  The torsion coil spring 44 is held by the bracket 29 by the retainer 45, the fixed portion 44 a of the torsion coil spring 44 is hooked to the lower through bolt 33, and the movable portion 44 b is hooked to the pin 42. An adjustment bolt 46 is screwed onto the upper end of the elevating shaft 35, and a stopper 47 is provided on which the adjustment bolt 46 hits the base 22. And by changing the height of the adjusting bolt 46, the upper limit position of the elevating shaft 35 can be adjusted, and the size of the cord loop can be adjusted.

  A locking part 49 is bent toward the base 22 at the upper end of the bracket 29, and a notch 50 is formed in the locking part 49. A clamp screw 51 that fits into the notch 50 is screwed onto the base 22, and the bracket 29 is held at the use position by clamping the locking portion 49 to the base 22 with this screw 51, and the foot portion of the loop holder 37 37b is positioned at the sewing location. As shown in FIG. 1, a plate spring 52 may be attached to the upper surface of the base 22 with a screw 53, and a latching portion 54 for holding the bracket 29 in the use position may be provided at the tip of the plate spring 52.

  A compression torsion spring 55 is fitted on the vertical axis 27 to urge the bracket 29 upward and to the use position side. A claw 56 is provided on the bracket 29 below the locking portion 49, and when the bracket 29 is opened to the non-use position side, the claw 56 is dissociated from the upper end portion 28 a of the drooping portion 28, and the bracket 29 is attached to the spring 55. The leg 37b of the loop holder 37 retreats upward from the work cloth W (chain line state in FIG. 1). In this state, the claw 56 comes into contact with the front surface of the base 22 above the drooping portion 28 (see FIG. 2), the bracket 29 is held in the non-use position by the restoring force of the spring 55, and the foot 37b is removed from the sewing location. It is arranged at a position retracted to the side.

  On the other hand, a code guide 58 is provided on the bracket 29 so as to protrude toward the needle bar 2, and a balance member 59 is provided on the needle stopper 5 on the needle bar 2. The code guide 58 is attached to the long hole 60 of the bracket 29 with a screw 61 so that the height can be adjusted. A guide hole 62 for guiding the cord C between the cone 13 and the loop holder 37 is formed in the hanging portion 58a of the cord guide 58 so as to open in a vertical plane.

  The balance member 59 is made of a bar, and is bent so that a balance hole 63 through which the cord C passes is opened in the vertical plane. The base end of the balance member 59 is fixed to the needle clamp 5, and the needle clamp 5 is attached to the needle bar 2 so as to be rotatable and adjustable with a screw 64 so that the balance hole 63 is positioned closer to the cone 13 than the cord guide 58. Has been. As the needle bar 2 moves up and down, the balance member 59 is configured to raise and lower the cord C on the supply source side from the guide hole 62.

  Next, the operation of the code guide device 21 will be described. At the time of loop sewing, the loop holder 37 is rotated and adjusted around the axis of the lifting shaft 35, and one of the three cord passage holes 41 of the foot portion 37 b that matches the thickness of the cord C is used as the passage of the needle 4. Position it. Further, the upper limit position of the foot portion 37 b is adjusted with the adjustment bolt 46 in accordance with the size of the loop, and the height of the code guide 58 is adjusted with the screw 61 according to the type of the code C. Then, as shown in FIG. 5A, the cord C is passed through the cone 13 in the order of the balance hole 63 of the balance member 59, the guide hole 62 of the code guide 58, and the cord passage holes 40 and 41 of the loop holder 37. Start sewing machine operation.

  When the needle bar 2 is lowered, as shown in FIG. 5 (b), the work clamp foot 6 steps down the loop holder 37 with the cord C interposed therebetween, and the foot portion 37b forms a loop in the cord C to process the cord loop. Hold on cloth W. The balance member 59 is lowered below the guide hole 62 integrally with the needle bar 2, sufficiently draws the cord C from the cone 13, and stores it on the supply source side from the cord guide 58. When the needle bar 2 is lifted, as shown in FIG. 5C, the balance member 59 is lifted, and the cord C previously stored is loosened around the loop holder 37, and the cord tension is lost. Then, the loop holder 37 is raised by the urging force of the torsion coil spring 44, and the presser foot 6 is separated from the loop holder 37 to release the cord C.

  In this state, the upper thread and lower thread are tightened and the loop is sewn to the work cloth W. At this time, the cord tension has already disappeared, so there is no risk that the loop will be tightened during sewing, preventing the loop from shrinking. As a result, the cord C can be sewn finely. Further, as shown in FIG. 5 (b), by adjusting the height of the cord guide 58, the amount of the cord drawn by the balance member 59 can be easily adjusted, and the cord tension at the time of sewing depends on the type of the cord. It can be adjusted appropriately.

  6 to 9 show a second embodiment of the code guiding device in the embroidery sewing machine, and the configuration different from the first embodiment will be described below. The cord guide device 71 includes a cord holder 72 at the lower end of the lifting shaft 35 so as to be applicable to cord sewing. A cup-shaped cord presser 73 is fixed to the lower end of the cord holder 72, and cord through holes 74 and 75 are formed in the peripheral wall and the bottom wall thereof. The fixed portion 44 a of the torsion coil spring 44 is hooked on the upper through bolt 32, and the movable portion 44 b is hooked on the pin 42. The elevating shaft 35 is urged downward by the torsion coil spring 44, and the cord presser 73 is pressed against the work cloth W in a state where the cord C is extended.

  A linear latching spring 78 is attached to the lower through-bolt 33 with a nut 77, an operating portion 78a is formed at the free end thereof, and a latching portion 78b is provided at an intermediate portion. When the bracket 29 is disposed at the non-use position, the lifting shaft 35 is raised and the pin 42 is hooked on the hooking portion 78b, whereby the cord holder 72 is held at the retracted position above the work cloth W. At the time of cord sewing, since the presser foot 6 does not function, the foot portion 6b is removed from the base portion 6a (see FIG. 7). Further, since the adjustment bolt 46 and the stopper 47 do not function, they may be removed.

  Similarly to the first embodiment, the cord guide 58 is attached to the elongated hole 60 of the bracket 29 with a screw 61 so that the height can be adjusted, and the cord C 58 is disposed between the cone 13 and the cord holder 72 on the hanging portion 58 a of the cord guide 58. A guide hole 62 for guiding the above is formed. The balance member 59 is fixed to the needle stopper 5, and the needle stopper 5 is fixed to the needle bar 2 with a screw 64 so that the balance hole 63 is positioned on the code holder 72 side from the code guide 58. As the needle bar 2 moves up and down, the balance member 59 is configured to raise and lower the cord C on the cord holder 72 side from the guide hole 62.

  Next, the operation of the code guidance device 71 will be described. When the cord is sewn, the cord holder 72 is rotated and adjusted around the axis of the elevating shaft 35 so that the cord passage hole 75 of the cord presser 73 is positioned in the passage of the needle 4 and the cord guide 58 is adjusted according to the type of the cord C. Adjust the height with the screw 61. Then, the cord C is passed from the cone 13 in the order of the guide hole 62 of the cord guide 58, the balance hole 63 of the balance member 59, and the cord passage holes 74 and 75 of the cord holder 72, and the operation of the embroidery sewing machine is started.

  During the operation of the sewing machine, the cord presser 73 of the cord holder 72 holds the cord C in a state where the cord C is extended, as shown in FIGS. In the vicinity of the top dead center of the needle 4, the balance member 59 loosens the cord C above the guide hole 62 on the cord holder 72 side from the hanging portion 58 a of the cord guide 58, as shown in FIG. Stockpile. When the needle bar 2 is lowered, as shown in FIG. 9B, the slack of the cord C is transferred to the cord holder 72 side as the balance member 59 is lowered. For this reason, there is no possibility that the cord C will be pulled before sewing, and the occurrence of wrinkles on the work cloth W can be prevented.

  When the needle bar 2 is lifted, as shown in FIG. 9 (c), the balance member 59 pulls up the cord C, and the slack around the cord holder 72 is eliminated. Sew on. Therefore, there is no possibility that the cord C is loosened under the cord presser 73 at the time of sewing, and the cord C can be prevented from meandering at the sewing location, so that the cord line can be formed with good appearance. Further, as shown in FIG. 9A, by adjusting the height of the cord guide 58, the amount of the cord pulled up by the balance member 59 can be easily adjusted, and the cord tension at the time of sewing depends on the type of cord. Can be adjusted appropriately.

  10 to 12 show a third embodiment of a code guiding device in an embroidery sewing machine. In the cord guide device 81, a loop holder 37 (see FIG. 11) and a cord holder 72 (see FIG. 12) are interchangeably attached to the lower end of the elevating shaft 35 so that both the loop stitching and the cord stitching can be performed. ing. The balance member 59 is fixed to the needle stopper 5 and a balance hole 63 is provided at the tip. The code guide 82 includes a mounting portion 82a that protrudes horizontally from the bracket 29, and a first guide portion 82b and a second guide portion 82c that are opposed to each other at the same height with the balance member 59 interposed therebetween. 29 is attached to 29 with a screw 61 so that the height can be adjusted.

  A first guide hole 83 for guiding the cord C between the cone 13 and the loop holder 37 is formed in the first guide portion 82b so as to open in a vertical plane. A second guide hole 84 for guiding the cord C between the cone 13 and the cord holder 72 is formed in the second guide portion 82c so as to open in a vertical plane. The balance member 59 is configured to move the cord C up and down between the first guide hole 83 and the second guide hole 84 as the needle bar 2 moves up and down. Other configurations are the same as those of the guide device 21 of the first embodiment and the guide device 71 of the second embodiment.

  According to the above configuration, by changing the order of passing the cord C, the cord guiding device 81 can be used for both loop stitching and cord stitching. When performing loop sewing, as shown in FIG. 11, a loop holder 37 is attached to the elevating shaft 35, the fixed portion 44a of the torsion coil spring 44 is hooked on the lower through bolt 33, and the movable portion 44b is connected to the pin 42. The cord guide 82 is adjusted with the screw 61. The cord C is passed from the cone 13 in the order of the balance hole 63 of the balance member 59, the first guide hole 83 of the code guide 82, and the cord passage holes 40 and 41 of the loop holder 37. During the operation of the embroidery sewing machine, the guide device 81 operates in the same manner as the device 21 of the first embodiment (see FIG. 5). When the needle bar 2 is lowered, the cord C is sufficiently pulled out, and the pulled cord C is Loosen when raised to prevent loop shrinkage when sewing.

  When performing cord sewing, as shown in FIG. 12, the cord holder 72 is attached to the lifting shaft 35, the latch spring 78 is attached to the lower through bolt 33, and the fixing portion 44a of the torsion coil spring 44 is attached to the upper side. The movable part 44 b is hooked on the pin 42, and the height of the cord guide 82 is adjusted with the screw 61. Then, the cord C is passed from the cone 13 in the order of the second guide hole 84 of the cord guide 82, the balance hole 63 of the balance member 59, and the cord passage holes 74 and 75 of the cord holder 72. During operation of the embroidery sewing machine, the guide device 81 operates in the same manner as the device 71 of the second embodiment (see FIG. 9), and the cord C is loosened when the needle bar 2 is lowered to prevent wrinkles of the work cloth W. When the needle bar 2 is raised, the cord C is pulled up to prevent the cord C from meandering at the sewing location.

13 to 17 show a fourth embodiment of the code guiding device in the embroidery sewing machine. The cord guide device 101 of the fourth embodiment and the cord guide device 81 of the third embodiment are the same in the basic configuration for both loop sewing and cord sewing, but the configuration related to the following four points Is different.
(A) The shape of the code guide 82.
(B) A mechanism for holding the bracket 29 in the use position.
(C) A mechanism for supporting the lifting shaft 35 on the bracket 29.
(D) The shape of the cord presser 124 in the cord holder 72.
Hereinafter, the difference will be described.

(Code Guide)
As shown in FIG. 13, in the cord guide 82 of the fourth embodiment, the first guide portion 82b and the second guide portion 82c are bent with the same width, and the entire cord guide 82 is compared with the third embodiment. In addition, it has a simpler shape and is smaller. The operation of the code guide 82 is the same as that of the third embodiment.

(Bracket holding mechanism)
As shown in FIGS. 13 to 15, the bracket 29 is supported by the base 22 so as to be rotatable about the vertical axis 27, and is separated from the needle bar 2 and the use position (solid line position in FIG. 14) approaching the needle bar 2. It is arranged at a non-use position (chain line position). The means for holding the bracket 29 in the non-use position includes a compression torsion spring 55 and a claw 56 as in the third embodiment. Unlike the third embodiment, the means for holding the bracket 29 in the use position is composed of a leaf spring 102 and a protrusion 103.

  The base end portion 104 of the leaf spring 102 is attached to the upper end portion of the bracket 29 with a bolt 105. At the free end of the leaf spring 102, the operation unit 106 is formed to bend upward. An R-shaped bent portion 107 is provided in the middle of the leaf spring 102. The upper end surface of the bracket 29 is provided below the upper surface of the base 22, and the bent portion 107 is connected to the bracket 29, the base 22, and the use position of the bracket 29, that is, in a state where the bracket 29 is joined to the end surface of the base 22. The step portion 108 can be deformed (see FIG. 15).

  The protrusion 103 is formed in a tapered shape at the upper end of the screw 109, and the screw 109 is screwed into the screw hole 110 of the base 22 and fixed by the nut 111 so that the protrusion amount of the protrusion 103 can be adjusted. Yes. A locking hole 112 having the same diameter as that of the protrusion 103 is formed between the operation portion 106 and the bent portion 107 of the leaf spring 102, and in a state where the bent portion 107 is deformed, the locking hole 112 is protruded 103. It is inserted by force.

  That is, as shown in FIG. 15A, when the bracket 29 is applied to the end surface of the base 22, the center of the locking hole 112 is shifted from the center of the protrusion 103 toward the bent portion 107 by a predetermined distance e. The locking hole 112 covers the protrusion 103 in an unfitted or half-fitted state. In this state, as shown in FIG. 15B, when the operation unit 106 is pushed down with the fingertip, the bent portion 107 is deformed toward the operation unit 106 due to the taper action of the projection 103, and the locking hole 112 is formed in the projection 103. It is designed to be completely fitted with a “click” and a confirmation sound.

  Therefore, according to this bracket holding mechanism, the bracket 29 can be firmly locked to the base 22 by a simple operation by forcibly fitting the locking hole 112 to the protrusion 103 during loop sewing or cord sewing. Therefore, there is no possibility that the loop holder 37 or the cord holder 72 will open as the work cloth W is fed, and the cord through holes 37b and 129 of the holders 37 and 72 are sewn, that is, the needle drop holes 17 of the needle plate 15. (See FIG. 3) can be accurately positioned and held.

  When the cord is not sewn, the bracket 29 is held in the non-use position by the compression torsion spring 55 and the claw 56 as in the third embodiment. Sewing can be performed. Since the leaf spring 102 acts independently of the code guide 82, the bracket holding mechanism is used as the code guide device 21 of the first embodiment, the code guide device 71 of the second embodiment, or the code holder or loop holder on the bracket. It is also possible to apply to various code guidance devices equipped with Alternatively, the leaf spring 102 may be mounted on the base 22 and the protrusion 103 may be provided on the bracket 29.

(Elevating shaft support mechanism)
As shown in FIGS. 13 and 16, the elevating shaft 35 is inserted and supported in the vertical hole 34 of the block 31, and the loop holder 37 or the cord holder 72 is attached to the lower end thereof in a replaceable manner. The block 31 is attached to the back surface side of the bracket 29, and a pin 42 projects from an intermediate portion of the elevating shaft 35. The pin 42 is fitted to the vertical groove 36 (see FIG. 16 b) of the block 31 and the slit 43 of the bracket 29 so as to be movable up and down, and the raising and lowering shaft 35 is prevented from rotating with respect to the bracket 29 by fitting the slit 43 and the pin 42. Has been.

  The slit 43 has a shape in which the upper end is closed and the lower end is opened, and is pierced through the bracket 29. A narrow portion 114 is formed to extend upward at the upper end of the slit 43. The bracket 29 is provided with a fulcrum part 115 located above the narrow part 114 and a movable part 116 that can be elastically rotated in the width direction of the slit 43 around the fulcrum part 115. The movable portion 116 is located on the free end side (the side opposite to the vertical axis 27) of the bracket 29, and is fixed to the block 31 with two upper and lower through bolts 117 and 118.

  The base end side portion of the bracket 29 is fixed to the block 31 with long through bolts 32 and 33, and one end of the torsion coil spring 44 is hooked on these bolts 32 and 33. The four bolts 32, 33, 117 and 118 are loosely inserted into the bolt insertion holes 119 of the block 31 and screwed into the screw holes 120 of the bracket 29. And the rotation (elastic deformation) of the movable part 116 is permitted by the bolt insertion hole 119 shown on the left side of FIG. In FIG. 16A, reference numeral 121 denotes a screw hole into which a plate spring mounting bolt 105 is screwed, and a height adjusting long hole 122 is formed in the base end portion 104 of the plate spring 102.

  Therefore, when there is a processing error in the pins 42 or the slits 43 or they are worn with long-term use, the elevating shaft 35 is first lowered and the four through bolts 32, 33, 117, 118 are first moved. To adjust the position of the block 31. Next, the through bolts 32 and 33 are tightened to fix the block 31 to the proximal end portion of the bracket 29. Subsequently, the movable portion 116 of the bracket 29 is pushed and rotated in the direction of arrow F in FIG. 16A to deform the slit 43 so that the lower end is closed, the through bolts 117 and 118 are tightened, and the movable portion 116 is blocked by the block 31. To fix. In this way, the pin 42 is sandwiched between the lower ends of the slits 43, the gap between both ends is eliminated, and the backlash around the axis of the elevating shaft 35 is eliminated.

  Therefore, the cord through holes 41 and 129 of the loop holder 37 or the cord holder 72 can always be accurately aligned with the needle drop hole 17, and the cord C can be sewn in an attractive manner. It becomes possible to suppress the noise accompanying the 35 high-speed operation. Since the operation of the lifting shaft 35 is not directly related to the function of the code guide 82, the lifting shaft support mechanism of the fourth embodiment is replaced with the code guiding device 21 of the first embodiment, the code guiding device 71 of the second embodiment, or The present invention can also be applied to various types of code guide devices in which a code holder or a loop holder is attached to a lifting shaft on a bracket.

  Further, a coil portion 44c (see FIG. 13) of the torsion coil spring 44 is held by a retainer 45 at a proximal end portion (a portion on the vertical axis 27 side) of the bracket 29. The movable portion 44b of the torsion coil spring 44 is hooked on the pin 42 from the lower side during loop sewing (see FIG. 11), and is hooked on the pin 42 from the upper side during cord sewing (see FIGS. 12 and 13). The fixing portion 44a of the torsion coil spring 44 is hooked on the lower right through bolt 33 from the upper side during loop sewing, and is hooked on the upper right through bolt 32 from the lower side during cord sewing.

  Accordingly, by changing the way of applying the torsion coil spring 44, one spring component can be used for both loop sewing and cord sewing. Further, since the coil portion 44c is held by the bracket 29, the torsion coil spring 44 can shorten the elevating shaft 35 as compared with the case where the compression coil spring is inserted into the elevating shaft 35, and the cord guiding devices 21, 71, 101 are provided. Can be promoted in size and weight, and there is no trouble of removing the lifting shaft 35 when changing the specifications of loop sewing and cord sewing.

(Cord holder)
As shown in FIGS. 13 and 17, the cord holder 72 used for cord sewing is attached to the lower end of the elevating shaft 35 with a screw 39 via a shaft holder 38. At the lower end of the shin portion 72a of the cord holder 72, a cord presser 124 is provided in a U shape whose upper surface is opened by sheet metal processing. In the cord presser 124, a pair of upright walls 125 and 126 facing each other and a bottom wall 127 in contact with the work cloth W are bent, and the cord is passed through the standing wall 125 and the bottom wall 127 on the shin portion 72a side. Holes 128 and 129 are provided. And both the standing walls 125 and 126 are formed in the inverted trapezoid shape which becomes narrow toward the lower side.

  As shown in FIG. 17 (c), in the cord through holes 128 and 129, the periphery of the entrance / exit portion is R-chamfered by buffing so that the cord C can be smoothly passed and guided. The cord passage hole 129 of the bottom wall 127 is formed such that the upper side is tapered and the lower side is small. As shown in FIGS. 17 (a) and 17 (c), the bottom wall 127 has a bottom surface mirror-finished by buffing and a peripheral edge R-chamfered to reduce friction with the cord C and the work cloth W. Yes. An R portion 130 for preventing the cord C from being hooked is provided at the upper end corners of the standing walls 125 and 126, and a notch portion 131 for passing the polishing string buff of the cord passage hole 129 is provided at the central portion of the standing wall 126. It has been.

  According to the cord presser 124 of the fourth embodiment, since the upright walls 125 and 126 are formed in an inverted trapezoidal shape that becomes narrower toward the lower side, the cord C is overlapped and sewn on the same portion of the work cloth W. The cord presser 124 smoothly gets over the already-sewn cord C. Therefore, it is not necessary to form the cord presser 124 in a cup shape (see FIGS. 8 and 12), and the entire cord holder 72 can be manufactured at low cost by sheet metal processing. Polishing of the holes 128 and 129 is facilitated. Moreover, since the upper surface and the two side surfaces of the cord presser 124 are open, it is easy for the operator to see the threading hole 129 of the bottom wall 127, and this can be easily and accurately positioned in the needle drop hole 17. It becomes possible.

As described in detail above, the code guidance device of each embodiment has the following effects.
(1) Since the balance member raises and lowers the cord on the supply source side from the guide hole of the cord guide, when loop sewing, the cord is sufficiently pulled out from the supply source when the needle bar is lowered, and the drawn cord is loosened when the needle bar is raised. It can prevent the loop from shrinking when sewing.
(2) Since the balance member raises and lowers the cord on the cord holder side from the guide hole of the cord guide, when sewing the cord, the cord is loosened when the needle bar is lowered, and the slack cord is pulled up when the needle bar is raised to meander the cord Can be prevented.
(3) Since the balance member moves up and down between the first guide hole and the second guide hole of the cord guide, the cord guide device can be used for both loop sewing and cord sewing by changing the order of passing the cord.

It is an elevational view of a code guide device showing Example 1 of the present invention. It is a top view of the same guidance device. It is a left view of the same guidance device. It is a perspective view of the guide device. It is operation | movement explanatory drawing of the same guidance apparatus. It is a top view of the code | cord | chord guide apparatus which shows Example 2 of this invention. It is a left view of the same guidance device. It is a perspective view of the guide device. It is operation | movement explanatory drawing of the same guidance apparatus value. It is a top view of the code | cord | chord guide apparatus which shows Example 3 of this invention. It is a perspective view which shows the loop sewing form of the same guide apparatus. It is a perspective view which shows the cord sewing form of the same guide apparatus. It is a perspective view of the code | cord | chord guide apparatus which shows Example 4 of this invention. It is a top view of the same guidance device. It is an elevational view of a bracket holding mechanism in the guide device. It is composition explanatory drawing of the raising / lowering axis | shaft support mechanism in the same guide apparatus. It is shape explanatory drawing of the cord holder in the same guide apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head frame 2 Needle bar 4 Needle 6 Work clamp foot 13 Cone 21 Code guide apparatus (Example 1)
22 Base 29 Bracket 35 Elevating shaft 37 Loop holder 44 Winding spring 46 Adjustment bolt 58 Code guide 59 Balance member 62 Guide hole 63 Balance hole 71 Code guide device (Example 2)
72 Code Holder 81 Code Guide Device (Example 3)
82 Code Guide 83 First Guide Hole 84 Second Guide Hole 101 Code Guide Device (Example 4)
C code W processed cloth

Claims (4)

In a cord guide device for a sewing machine used for cord sewing, a cord holder (72) is attached to the lower end of the lifting shaft (35), a cord presser (124) is provided on the lower end of the cord holder (72), and the cord presser (124) is provided. The pair of upstanding walls (125, 126) and the bottom wall (127) facing each other are bent by sheet metal processing so as to form a U-shape with the upper surface open , and one of the standing walls (125) and the bottom wall (127 ) Are provided with cord passage holes (128, 129), and both standing walls (125, 126) are formed in an inverted trapezoidal shape with a narrower width toward the lower side.   The cord through holes (128, 129) are rounded on the periphery of the entrance / exit portion by buffing so that the cord can be smoothly passed and guided, and the cord through holes (129) are formed at the center of the standing wall (126). The cord guide device for a sewing machine according to claim 1, further comprising a notch (131) through which the polishing string buff is passed.   The cord guide device for a sewing machine according to claim 1 or 2, wherein the cord passage hole (129) of the bottom wall (127) is formed with a taper on the upper side and a small diameter on the lower side.   The sewing machine cord according to claim 1, 2 or 3, wherein the bottom wall (127) has a mirror-finished bottom surface by buffing and a rounded chamfered edge to reduce friction with the cord and work cloth. Guide device.

Images