JP2005137515A - Embroidery machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a thread from being cut by reducing the length of a threat passage formed on a thread passage forming table for each needle thread and to miniaturize the whole size of a head part of an embroidery machine. <P>SOLUTION: A thread tension adjusting part 12 for adjusting the tension of each embroidery thread S between a spool holder base and each thread take-up lever 39 consists of a tension table 13, a plurality of first tensions 19, a plurality of spinning wheels 24, a plurality of second tensions 27 and a plurality of thread take-up springs 33, etc. The tension of each embroidery thread S extending on the thread tension table 13 from the spool holder base toward each thread take-up lever 39 is roughly adjusted by each first tension 19, and after that, minutely adjusted by using a tension block in the second tension 27. The thread passages of the embroidery threads S are formed to extend linearly, parallel to each other, from the position of their spinning wheels 24 to the position of the thread take-up lever 39 via the second tensions 27 and the thread take-up springs 33. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an embroidery machine suitably used for forming a multicolored embroidery pattern on, for example, an embroidery cloth, and more particularly to a multi-head embroidery machine having a plurality of head portions.

  In general, an embroidery machine that realizes a multi-color embroidery pattern on an embroidery object such as a cloth using a multi-color upper thread (embroidery thread) by driving and controlling the main shaft of the embroidery machine according to embroidery data and the like. Is known (see, for example, Patent Document 1).

  This type of prior art embroidery machine includes a base provided with a drive source such as an electric motor that rotationally drives the main shaft, a plurality of sewing needles mounted on the base for performing multicolor embroidery, and a plurality of sewing needles. A head portion provided with a balance, and a plurality of colors of upper yarns provided on the base, located on the rear side of the head portion, for supplying upper thread to each sewing needle and each balance of the head portion. The upper thread storage section is configured to be stored, and the thread tension adjustment section that is provided between the upper thread storage section and the balance and is provided in the head section to adjust the tension of each upper thread.

  In this case, the yarn tension adjusting section is generally called a thread tension base, and is formed on the head section, and forms a thread path for each upper thread extending from the upper thread storage section toward each balance. A plurality of first thread tensions that are respectively provided on the thread path forming stand and are arranged on the upstream side of the thread path and that roughly adjust the tension of each upper thread individually, the first thread tensions, and the A plurality of second thread tensions or the like that are provided between the balances and are respectively placed horizontally on the yarn path forming stand and finely adjust the tension of each upper thread individually.

JP 2002-235271 A

  By the way, in the above-described embroidery machine according to the prior art, for example, the support shaft of the second thread tension is moved forward from the surface of the thread path forming base so that the second thread tension is arranged horizontally on the thread path forming base. It is provided so as to protrude vertically, and a circular tension plate or the like that attaches an upper thread from the front and rear directions and applies tension is provided on the outer peripheral side of the support shaft. Further, the thread take-up spring that is bent and deformed following the movement of the balance with the middle part of the upper thread hooked is also configured to extend in the radial direction of the support shaft and bend and deform in the circumferential direction.

  For this reason, the tension plate and the thread take-up spring of the second thread tension that are arranged horizontally on the yarn path forming table occupy a relatively large space on the front side of the yarn path forming table. For example, in the case where a total of 9 to 12 second thread tensions are attached to the yarn path forming base, it is necessary to arrange these second thread tensions in two stages, upper and lower, thereby forming the thread path. There is a problem that the external dimensions of the entire table increase.

  Further, the yarn path formed for each upper thread on the yarn path forming table is greatly bent left and right by the tension plate and the thread take-up spring at the position of the second thread tension. There is a problem that excessive tension is applied to the upper thread at the bent portion of the yarn path, causing thread breakage and the like.

  Further, in a multi-head embroidery machine having a structure in which a plurality of head parts are provided on the base of the embroidery machine, the thread path forming base provided in each head part is formed with a relatively large size in the left and right directions. Therefore, it is necessary to secure a large space between the head portions so that the yarn path forming bases do not contact and interfere with each other on the left and right, and there is a problem that the entire embroidery machine is enlarged.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to arrange the second thread tension on the yarn path forming table in a small occupied space, including the yarn path forming table. An object of the present invention is to provide an embroidery machine that can be made compact in size and compact.

  Another object of the present invention is to arrange the second thread tension on the yarn path forming table in a vertically placed state, not on the yarn path forming table, so that each upper thread is formed on the yarn path forming table. The embroidery machine can be formed as a thread path that extends in a straight line parallel to each other, the length of each thread path can be shortened, and the occurrence of thread breakage and the like can be satisfactorily suppressed. Is to provide.

  In order to solve the above-described problems, the present invention is provided with a base provided with a drive source for embroidery, a plurality of sewing needles mounted on the base and performing multicolor embroidery, and a plurality of balances. A head portion, an upper thread storage portion for storing upper threads of a plurality of colors for supplying the upper thread to each sewing needle and each balance of the head portion, and the upper thread storage portion and the balance. And is applied to an embroidery machine provided with a thread tension adjusting section that is provided in the head section and adjusts the tension of each upper thread.

  A feature of the configuration adopted by the invention of claim 1 is that the yarn tension adjusting portion is attached to the head portion and forms a yarn path for each upper yarn extending from the upper yarn storage portion toward each balance. A plurality of first thread tensions that are provided on the upstream side of the yarn path and arranged in parallel to the yarn path formation base, respectively, and that individually and roughly adjust the tension of each upper thread, And a plurality of second thread tensions which are provided between the first thread tensions and the respective balances and are provided in parallel on the yarn path forming base and finely adjust the tension of each upper thread individually. The plurality of second thread tensions are arranged in a vertical state on the yarn path forming table at intervals substantially corresponding to the intervals of the respective balances, and each thread path of the yarn path forming table is directed to the respective balances. In this configuration, the yarn paths are formed in parallel to each other in the right direction and extend linearly.

  According to a second aspect of the present invention, each of the second thread tensions has a support shaft extending in the left and right directions so as to cross the yarn path in parallel with the surface of the yarn path forming table, and the support shaft. A pair of tension plates that are inserted and fitted to the outer peripheral side of the upper thread from both the left and right sides, an adjustment dial that is screwed to the support shaft to finely adjust the tension of the upper thread, It is comprised by the spring which is arrange | positioned between one tone plate among a pair of tone plates, and this adjustment dial, and a spring force is variably adjusted with this adjustment dial.

  On the other hand, according to the invention of claim 3, the middle portion of each upper thread is hung on the yarn path forming stand of the yarn tension adjusting portion between the second thread tension and the balance. A plurality of thread take-up springs that bend and deform following the movement of the balance are provided, and the thread take-up springs are arranged in a parallel state with intervals in the left and right directions substantially corresponding to the intervals between the balances.

  According to a fourth aspect of the present invention, the yarn path forming stand of the yarn tension adjusting unit is positioned between the first thread tension and the second thread tension to detect thread breakage. A plurality of rotating bodies are provided in which a middle portion of the upper thread is wound and rotated following the movement of the upper thread, and the rotating bodies are arranged in the left and right directions substantially corresponding to the intervals between the second thread tensions. It is set as the structure arrange | positioned in a parallel state with a space | interval.

  As described above, according to the first aspect of the present invention, the yarn tension adjusting unit positioned between the upper yarn storage unit and the balance is provided with the yarn path forming base, the plurality of first yarn tensions, and the plurality of second yarns. The plurality of second thread tensions are arranged in a vertically placed state on the yarn path forming table at intervals substantially corresponding to the intervals of the respective balances, whereby each yarn path of the yarn path forming table is arranged. Since it is configured to be formed as a thread path extending in a straight line parallel to each other in the left and right directions toward each balance, it is possible to arrange the upper threads in a straight line at the shortest distance from the second thread tension toward the balance. The length of the yarn path for each upper thread can be shortened, and it is possible to prevent excessive tension from being applied to the upper thread in the middle part of the thread path, thereby reliably reducing the occurrence of thread breakage and the like. it can.

  Then, the plurality of first thread tensions and the plurality of second thread tensions can be arranged on the yarn path forming table with a small occupied space, and the overall outer dimension of the yarn path forming table can be formed small. In addition, the yarn tension adjusting unit composed of the yarn path forming table, the first thread tension, and the second thread tension, the tension of each upper thread extending on the yarn path forming table from the upper thread storage unit toward each balance, After coarse adjustment with the first thread tension, fine adjustment can be performed with the second thread tension, and the tension for each upper thread supplied toward the balance can be optimized.

  Accordingly, a plurality of second thread tensions corresponding to the number of embroidery threads (upper threads) for performing multicolor embroidery can be arranged on the thread path forming table in a small occupied space, and the embroidery machine including the thread path forming table is included. The entire head portion can be made compact and compact. In addition, each yarn path formed for each upper thread on the yarn path forming table can be formed as a thread path extending in a straight line parallel to each other, and the length of each thread path can be shortened. The occurrence of thread breakage and the like can be satisfactorily suppressed, and the quality of the embroidery pattern can be improved.

  The invention according to claim 2 is characterized in that the second thread tension is adjusted by a support shaft extending in the left and right directions so as to cross the yarn path, a pair of tension plates, an adjustment dial for finely adjusting the tension of the upper thread, and a spring. Since it is configured, the entire second thread tension can be disposed in parallel with the support shaft with respect to the surface of the yarn path forming table, and the occupied space of the second thread condition on the yarn path forming table is conventionally increased. The technology can be greatly reduced. Then, all the second thread tensions can be arranged in a line on the left and right sides in a compact manner with respect to the yarn path forming table.

  Further, if the operator of the embroidery machine winds the upper thread from the front side of the yarn path forming base by one turn on the outer peripheral side of the support shaft between the pair of tension plates, the upper thread can be easily applied to the second thread tension. The upper thread can be clamped between a pair of tone plates. Then, by turning the adjustment dial screwed to the support shaft from the front side of the yarn path forming table by manual operation, etc., the spring force of the spring (the holding force of the upper thread by the tension plate) can be easily adjusted. The tension applied to the yarn can be finely adjusted so as to be a yarn tension suitable for each type.

  On the other hand, according to the invention described in claim 3, the yarn path forming base of the yarn tension adjusting portion is provided with a plurality of thread take-up springs positioned between each second thread tension and each balance, and these thread take-up springs. Are arranged in parallel at left and right intervals substantially corresponding to the intervals of the balances, so that the upper thread is bent left and right by the thread take-up spring between the second thread tension and the balance. Accordingly, the yarn path of the upper thread from the second thread tension to the balance can be arranged linearly at the shortest distance, and the length of the thread path for each upper thread can be shortened. In addition, since the thread take-up spring is latched in the middle part of the upper thread and bends and deforms following the movement of the balance, the tension of the upper thread can be adjusted to an appropriate magnitude while the balance is moving up and down. At this time, the upper yarn can be fed to the balance with low friction.

  According to a fourth aspect of the present invention, the yarn path forming stand of the yarn tension adjusting section is positioned between each first thread tension and each second thread tension to rotate for detecting thread breakage. A plurality of bodies are provided, and these rotating bodies are arranged in a parallel state with intervals in the left and right directions substantially corresponding to the intervals between the second thread tensions. From these rotating bodies to the second thread tensions. The thread path of the upper thread can also be arranged in a straight line at the shortest distance, and the length of the thread path for each upper thread can be shortened. In addition, since the rotating body is wound in the middle part of the upper thread and rotates following the movement of the upper thread, the amount of consumption (supply) of the upper thread can be detected by the rotation of the rotating body, The occurrence of yarn breakage can be detected by nothing.

  Hereinafter, the case where the embroidery machine according to the embodiment of the present invention is applied to a multi-head embroidery machine will be described as an example and described in detail with reference to the accompanying drawings.

  Here, FIG. 1 to FIG. 12 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a base constituting the main body of the multi-head embroidery machine. On the base 1, as shown in FIG. A head support 4 extending in the left and right directions is fixed between the side frames 2 and 3.

  5, 5,... Are head portions of the embroidery machine provided on the front side of the head support 4, and a total of three head portions 5 are provided on the base 1. For example, a three-head sewing head is provided. It is composed. This is just an example, and there are some models on which three or more heads 5 are provided on the base 1, for example, 15 heads 5.

  These head portions 5 are provided on the head main body 6 and the front side of the head main body 6 as shown in FIGS. 2 and 3, and left and right with respect to the head main body 6 (arrow A in FIG. 1). , B direction) which is movable on the needle bar case 7 as a movable support, and provided on the needle bar case 7, and is integrated with the needle bar case 7 in the left and right directions by the color changing mechanism 10 described later. It is comprised by the below-mentioned thread tension stand 13 etc. which are moved.

  Further, on the upper side of the needle bar case 7, as shown in FIGS. 3 and 4, there are provided balance support frames 7A and 7A each consisting of a pair of frame bodies spaced leftward and rightward. Each balance 39, which will be described later, is sandwiched from both the left and right sides to protect each balance 39 from external obstacles.

  Further, the head main body 6 of each head unit 5 is provided with a balance driving unit and a needle bar driving unit (both not shown) driven by the main shaft motor 8 shown in FIG. The later-described balance 39 and needle bar 40 are respectively driven up and down by the driving unit.

  Reference numeral 10 denotes a color changing mechanism provided on the upper side of the head main body 6, and the color changing mechanism 10 is arranged on the upper side of the head main body 6 as shown in FIGS. 2 and 4, and includes a needle bar case 7 and a thread tension base 13. Are moved leftward and rightward (in the directions indicated by arrows A and B in FIG. 1) to perform a color change operation described later.

  Reference numeral 11 denotes a thread stand as an upper thread storage portion located on the base 1 and disposed on the rear side of the head support 4. The thread stand 11 includes a plurality of upper stands as shown in FIG. Threaded bobbins 11A, 11B, 11C,... Are provided, and these upper thread bobbins 11A, 11B, 11C,... Have, for example, multiple colors of upper threads (hereinafter referred to as embroidery) such as red, blue, yellow, white, and black. Thread Y) and the like are wound.

  At the time of embroidery work, the embroidery thread S selected by the color changing mechanism 10 from these upper thread bobbins 11A, 11B, 11C,... Many colors of embroidery (not shown) are performed in accordance with the operation of the sewing needle 41 described later.

  A thread tension adjusting unit 12 adjusts the tension of the embroidery thread S. The thread tension adjusting unit 12 is provided between the thread stand 11 and the balance 39 as shown in FIG. A thread tension base 13 as a yarn path forming base, and a first thread tension 19, a thread wheel 24, a second thread tension 27, a thread take-up spring 33, and the like, which will be described later, are configured.

  On the front surface (front surface) side of the thread tension base 13, as shown in FIG. 4, the plurality of embroidery threads S are connected to the second thread tension 27, the thread take-up springs 33 and the like from the positions of the first thread tensions 19 described later. A thread path for each embroidery thread S extending in parallel with each other with an interval C of, for example, about 5 to 10 mm is formed toward each balance 39. These thread paths are formed as thread paths that extend in a substantially straight line from a later-described spinning wheel 24 toward the second thread tension 27 and the thread take-up spring 33 (balance 39).

  Here, the thread tension base 13 includes a front case 14 formed in a substantially rectangular box shape as shown in FIGS. 4 and 5, a back cover 15 that covers the front case 14 from the rear side, and the front case 14 as a needle. It is comprised by the attachment bracket 16 etc. which consist of an angle material for fixing to the upper end side of the rod case 7.

  In the front case 14 of the thread tension base 13, a substrate 17 for a photosensor 26, which will be described later, is provided on the upper end side of the mounting bracket 16, and the substrate 17 is placed on the left and right sides in the front case 14. It is formed as an elongated plate-like body extending in the direction.

  Further, on the front surface (front surface) side of the front case 14, there is provided a stepped portion 14A which is located in the middle in the height direction and extends in the left and right directions, and the upper side of the stepped portion 14A is shown in FIG. In this way, stepped cylindrical bearing portions 14B, 14B,... Spaced apart from each other at intervals C (for example, about 5 to 10 mm) are provided in the left and right directions.

  Further, as shown in FIG. 5, the front case 14 is provided with spring bearings 14C, 14C,... Which are located below the second thread tension 27 described later and project toward the back cover 15 side. The bearings 14C are separated from each other in the left and right directions as shown in FIG.

  The spring bearing 14C has a substantially U-shaped cross section as shown in FIG. 12 on the protruding end (tip) side, and positions a spring shaft 34, which will be described later, with the presser plate 35. In addition, the front case 14 is provided with a pair of pedestal portions 14D (only one is shown in FIG. 12) located on both the left and right sides of each spring bearing 14C. The presser plate 35 described later is fixed in an abutting state.

  Further, on the lower side of the front case 14, substantially L-shaped openings 14E, 14E,... Extending upward and downward from the lower positions of the spring bearings 14C are formed. The thread take-up springs 33, which will be described later, are arranged so as to be able to advance and retreat in the forward and backward directions (in the direction of arrow E in FIG. 5).

  18 is a thread tension plate provided on the front upper end side of the front case 14, and the thread tension plate 18 is formed as a plate-like body extending in the width direction of the front case 14 as shown in FIGS. On the front side, for example, a total of 13 protrusions 18A, 18A,... Having a circular pin shape are provided with a spacing C in the left and right directions.

  .. Are a plurality of first thread tensions attached to the projections 18A of the thread tension plate 18. These first thread tensions 19 are metal thin plate materials having spring properties as shown in FIGS. Are formed by curving both end sides in a circular arc shape, one side of which is an arcuate mounting portion 19A, and the other side is an arcuate biasing portion 19B. Note that a receiving plate 20 curved in a U-shape is attached to the projection 18A located on the rightmost side among the projections 18A provided on the thread tension plate 18, as shown in FIG.

  Further, the attachment portion 19A of the first thread tension 19 is attached so as to be wound around the protrusion 18A of the yarn tensioning plate 18, and using a screw (not shown) or the like inserted into the retaining hole 19C shown in FIG. It is fixed to the protrusion 18A. In this case, the first thread tension 19 is attached to the protrusion 18A in an inclined state in advance, and the urging portion 19B of the first thread tension 19 is attached to the counterpart attachment section 19A (receiving plate) as shown in FIG. 20) between the embroidery thread S and the embroidery thread S.

  Each first thread tension 19 is arranged on each protrusion 18A of the yarn tension plate 18 with a left and right spacing C (for example, about 5 to 10 mm) as shown in FIG. 4, and each biasing portion 19B. The tension of the embroidery thread S is roughly adjusted on the side, and the thread path of the embroidery thread S extending parallel to each other with a gap C is formed on the front surface side of the thread tension base 13 in cooperation with a second thread tension 27 and the like described later. Is.

  .. Are thread breakage detecting devices that are located between the first thread tension 19 and the second thread tension 27 and are provided on the thread tension stand 13, and each thread breakage detecting device 21 is shown in FIG. As shown in FIG. 8, it is comprised by the rotating shafts 22 and 23 each rotatably provided in each bearing part 14B of the front case 14, and the below-mentioned spinning wheel 24, the slit board 25, the photo sensor 26, etc.

  In this case, as shown in FIG. 8, the rotary shafts 22 and 23 are spaced apart from each other with a gap C in the left and right directions, and the large-diameter shaft portions 22A and 23A located on the rear side of the bearing portion 14B are alternately different. It is formed in the axial length. Each of these large-diameter shaft portions 22A and 23A is provided with slit plates 25, which will be described later, fixed in positions that are alternated in the left and right directions.

  24, 24,... Are spinning wheels as rotating bodies located on the rotary shafts 22 and 23, respectively, located on the front side of the front case 14, and each spinning wheel 24 has two spinning wheel members 24A as shown in FIG. 24B are superposed on each other, and the embroidery thread S is wound around the spinning wheel member 24A, 24B toward the second thread tension 27 (to be described later) as shown in FIGS. It is arranged to extend.

  Further, as shown in FIG. 8, the spinning wheel members 24A and 24B of the spinning wheel 24 are formed in a disk shape having an outer diameter smaller than the interval C between the rotating shafts 22 and 23, and the rotating shaft is attached to the bearing portion 14B of the front case 14. 22 and 23 are rotatably supported. The spinning wheel 24 rotates following the movement of the embroidery thread S when the embroidery thread S is supplied (supplied) toward the second thread tension 27 side. To the slit plate 25.

  25, 25,... Are slit plates that are positioned in the front case 14 and are provided on the large-diameter shaft portions 22A, 23A of the rotary shafts 22, 23, and serve as detected bodies. The elongated slits 25A, 25A,... Are formed in a disk shape having an outer diameter larger than the interval C between 22 and 23, and radially extend as shown in FIG. It is drilled with.

  As shown in FIG. 8, the slit plates 25 are staggered in the front and rear directions (axial directions of the rotary shafts 22 and 23) by the large-diameter shaft portions 22A and 23A of the rotary shafts 22 and 23, and in the left and right directions. They are arranged so as to overlap with an overlap margin D (for example, about 1 to 3 mm), and each rotate independently.

  That is, each slit plate 25 adjusts the supply amount (consumption amount) of the embroidery thread S together with the spinning wheel 24 and the rotary shafts 22 and 23 following the supply of the embroidery thread S toward the second thread tension 27 side. The rotation is performed at a corresponding rotation number (rotation angle), and this rotation is detected by a photosensor 26 described later.

  Reference numeral 26 denotes a photosensor as a rotation detecting means for detecting the rotation of each slit plate 25. The photosensor 26 is located in the front case 14 and fixed to the lower surface side of the substrate 17 as shown in FIG. It has been. The photosensor 26 has a light emitting portion and a light receiving portion (both not shown) at positions where the slit plates 25 are sandwiched in front and behind, and optically slits through the slits 25A of the slit plate 25. The rotation of the plate 25 is detected.

  In this case, the photosensor 26 can detect the consumption (supply) amount of the embroidery thread S with high accuracy by detecting each slit 25A of the slit plate 25. Further, when the thread breakage occurs in the embroidery thread S (upper thread), the supply of the embroidery thread S is interrupted and the rotation of the spinning wheel 24 is stopped, so that the photocenter 26 rotates the slit plate 25 (thread wheel 24). The occurrence of thread breakage is detected by the presence or absence of.

  27, 27,... Are second thread tensions provided on the front surface side of the front case 14 between the respective thread pulleys 24 and the thread take-up springs 33. The second thread tensions 27 are shown in FIGS. As shown in FIG. 4, a mounting plate 28 formed by bending a metal plate into an L shape, a support shaft 29 attached to the mounting plate 28 in a cantilevered state, a tone plate 30, an adjustment dial 31 and a spring 32, which will be described later. Etc. In the second thread tension 27, the tension plate 30, the adjustment dial 31, and the like are arranged on the front side of the thread tension base 13 in a vertically placed state, not horizontally.

  Here, the mounting plate 28 of each second thread tension 27 is positioned below the stepped portion 14A as shown in FIG. 5 and fixed to the front side of the front case 14 with screws or the like, and at a distance C shown in FIG. They are installed side by side (in parallel) at the corresponding intervals. Further, the support shaft 29 has a proximal end fixed to the mounting plate 28 and a distal end that is a free end and extends along the axis OO shown in FIG.

  In this case, the axis OO of the support shaft 29 extends in the left and right directions so as to cross the yarn path (embroidery thread S) in parallel with the surface of the thread tension base 13 (front case 14). The support shaft 29 has an axial dimension shorter than the interval C shown in FIG. 4, and a male screw (not shown) into which an adjustment dial 31 described later is screwed is formed on the outer periphery on the front end side. Is.

  Reference numerals 30 and 30 denote a pair of condition dishes that are inserted into the outer peripheral side of the support shaft 29 and are in a vertically placed state. Each condition dish 30 is formed in a circular dish shape using a thin metal plate or the like as shown in FIG. The inner peripheral side of the support shaft 29 is slidably attached along the axis OO. An embroidery thread S, which is an upper thread, is wound and mounted between the pair of condition dishes 30 and 30. At this time, each condition dish 30 is embroidered by an urging force of a spring 32 described later. S is sandwiched from both the left and right sides.

  31 is an adjustment dial that is screwed to the tip end of the support shaft 29, 32 is a spring disposed between the adjustment dial 31 and the tension plate 30, and the spring 32 is, for example, a coil spring or the like. And is disposed between one of the pair of tone plates 30 and 30 and the adjustment dial 31 on the outer peripheral side of the support shaft 29.

  When the tension to be applied to the embroidery thread S is finely adjusted between the tension plates 30 and 30 of the second thread tension 27 arranged in the vertically placed state, the operator of the embroidery machine moves the adjustment dial 31 around the axis OO. , The spring force (biasing force) of the spring 32 is variably adjusted by changing the screwing position of the adjustment dial 31 with respect to the support shaft 29. Thereby, the tension applied to the embroidery thread S is finely adjusted so as to be a thread tension suitable for each type.

  33 are thread take-up springs provided on the front case 14 at the downstream side of each second thread tension 27. Each of the thread take-up springs 33 is a spring shaft 34 to be described later as shown in FIGS. These are arranged between the spring bearings 14C of the front case 14 using the holding plate 35 and the like, and are advanced and retracted forward and backward through the openings 14E, 14E,.

  Here, as shown in FIGS. 11 and 12, the thread take-up spring 33 includes a circular coil portion 33A that is inserted into the outer peripheral side of the spring shaft 34, and an L that protrudes radially outward from one end side of the coil portion 33A. A character-shaped hook portion 33B and a hook portion 33C which is opposite to the hook portion 33B and is drawn radially outward from the other end side of the coil portion 33A, and whose tip side has a hook shape. It is configured.

  Further, the thread hooking portion 33C of each thread take-up spring 33 is located between the second thread tension 27 and a thread guide 37 described later, and substantially corresponds to the interval C shown in FIG. Are arranged in parallel with an interval in the left and right directions. As shown in FIG. 5, each thread take-up spring 33 has its embroidery thread S in the middle of the thread hooking portion 33C and follows the movement of the balance 39, which will be described later. It bends and deforms.

  That is, while the balance 39 is driven downward from the position illustrated in FIG. 3, the thread take-up spring 33 returns to the position indicated by the solid line in FIG. 5, and when the balance 39 is driven upward, the movement of the embroidery thread S Following this, the thread take-up spring 33 is bent and deformed in the direction of arrow E in FIG. As a result, the embroidery thread S is fed with low friction from the second thread tension 27 side to the balance 39 side via the thread take-up spring 33 and the like.

  In this case, the thread take-up spring 33 applies an appropriate tension to the embroidery thread S together with the second thread tension 27, and the embroidery thread S is pulled beyond the tension by a balance 39 and a sewing needle 41 described later. The embroidery thread S is allowed to be fed toward the balance 39 side.

  Reference numeral 34 denotes a spring shaft that supports the thread take-up springs 33 arranged in the left and right directions. The spring shaft 34 is arranged between the left and right pedestal portions 14D (only one is shown) as shown in FIG. The coil portions 33 </ b> A of the thread take-up springs 33 are inserted on the outer peripheral side of the spring shaft 34. The spring shaft 34 holds the respective thread take-up springs 33 in an aligned state between the respective spring bearings 14C (including the pedestal portion 14D), and a later-described presser plate that tilts the thread take-up springs 33 to the left and right. 35 together with regulation.

  Reference numeral 35 denotes a press plate for holding each thread take-up spring 33 between each spring bearing 14C of the front case 14, and the press plate 35 has a substantially U-shaped cross section as shown in FIGS. The left and right ends are fixed to the pedestal portion 14D of the front case 14 in the abutting state using screws or the like.

  The upper end side of the presser plate 35 is a spring receiving portion 35A to which the hooking portion 33B of the thread take-up spring 33 is hooked, and the other lower end of the presser plate 35 is extended with another flat plate downward. A portion 35B is provided. Further, a stopper 36 made of a flat plate is fixed to the spring receiving portion 35B by means such as adhesion.

  In this case, the spring receiving portion 35B and the stopper 36 of the presser plate 35 are designed to show the spring force of the thread take-up spring 33 even when the yarn hooking portion 33C of the thread take-up spring 33 is repeatedly bent and deformed in the direction of arrow E in FIG. 5 is received at a position indicated by a solid line, and when a later-described balance 39 stops at a predetermined position, the thread catching portion 33C side of the thread take-up spring 33 is held in a standby state as shown in FIG. .

  Reference numeral 37 denotes a thread guide provided between the respective thread take-up springs 33 and the balance 39 and provided on the lower side of the front case 14. The thread guide 37 extends leftward and rightward along the lower end side of the front case 14. For example, a total of twelve thread hooking grooves 37A (see FIG. 5) are provided at intervals in the left and right directions substantially corresponding to the interval C shown in FIG. Then, one embroidery thread S is inserted between each thread catching groove 37A of the thread guide 37 between the thread take-up spring 33 and the balance 39.

  Reference numeral 38 denotes another thread guide provided on the front side of the needle bar case 7 and positioned below the balance 39. The thread guide 38 is arranged in the width direction (left side) of the needle bar case 7 as shown in FIG. , Rightward), for example, a total of 12 thread insertion portions 38A, 38A,... Are provided at intervals in the left and right directions substantially corresponding to the interval C.

  Further, as shown in FIGS. 3 and 4, the yarn guide 38 is provided with a total of 12 yarn hooking portions 38B corresponding to the respective yarn insertion portions 16A. Each embroidery thread S guided from the upper thread guide 37 is inserted into a thread hooking portion 38B of the thread guide 38, and then drawn toward a thread insertion hole 39A of a balance 39, which will be described later, from the thread insertion hole 39A. The guide 38 is guided to the sewing needle 41 side through the thread insertion portion 38A.

  39, 39,... Are scales provided so as to protrude from the needle bar case 7 of the head portion 5 to the front surface side. These balances 39 are substantially spaced with a distance C in the needle bar case 7 as shown in FIGS. A total of twelve are arranged in parallel with corresponding left and right spacings. Each balance 39 is rotatably supported by a balance support shaft (not shown), and swings up and down according to the rotation of the main shaft 9 by a balance drive unit (not shown) provided in the head body 6. It will be moved.

  In this case, the balance 39 is also provided with a balance holding mechanism similar to the embroidery machine described in, for example, JP-A-2002-235271. When the color changing mechanism 10 moves the needle bar case 7 to the left or right and performs the color changing operation, for example, one of the 12 balances 39 in total is the color changing mechanism 10. Only the selected balance 39 is selected and swung up and down. Further, the remaining balance 39 which is not selected is held at the standby position illustrated in FIG. 3 by the balance holding mechanism, and continues to stop at this standby position until it is selected by the color changing mechanism 10 thereafter. is there.

  On the other hand, a thread insertion hole 39A is formed on the tip (protruding end) side of the balance 39, and the embroidery thread S is inserted through the thread insertion hole 39A. In this state, when the balance 39 is driven downward from the top dead center to the bottom dead center, it gives a slight slack to the embroidery thread S between the sewing needle 41 and the embroidery thread S. Feed the yarn to the side.

  Further, when the balance 39 is driven upward, the embroidery thread S is placed between the seam (not shown) formed on the embroidery cloth by the sewing needle 41 and the thread take-up spring 33, the second thread tension 27, etc. A tension is applied to the embroidery thread S as if it is pulled up, and the seam is tightened and the embroidery thread S is fed out.

  .. Are, for example, twelve needle bars provided in the needle bar case 7 at the lower side of the balance 39, and a sewing needle 41 can be attached to and detached from the lower end side of each needle bar 40. It is installed. The needle bar 40 and the sewing needle 41 are driven up and down in accordance with the rotation of the main shaft 9 by a needle bar drive unit (not shown) provided in the head body 6.

  The needle bar 40 and the sewing needle 41 are also selected by the color changing mechanism 10 similarly to the balance 39, and only the selected needle bar 40 is reciprocated up and down together with the sewing needle 41. . The remaining needle bar 40 that is not selected by the color changing mechanism 10 stays at the top dead center position together with the sewing needle 41 as shown in FIGS. It is held at the dead center position.

  As shown in FIGS. 1 and 2, reference numeral 42 denotes a moving frame such as an embroidery frame located on the base 1 of the embroidery machine located below each head portion 5. An embroidery cloth (not shown) or the like is held under the three head portions 5 in a stretched state, and the embroidery cloth is horizontally moved forward, rearward, left, and right by the frame moving motor 43 and the like. The frame is moved in the direction.

  In this case, the frame moving motor 43 is provided on the back side of the base 1 as shown in FIG. 2, and constitutes the drive source of the embroidery machine together with the spindle motor 8 and the like described above. When the moving frame 42 is moved in this manner, the sewing needles 41 on the head unit 5 side are moved up and down almost in conjunction with this movement, so that the embroidery cloth or the like corresponds to the embroidery data. This embroidery pattern is realized for each head portion 5.

  1 are lower thread rotary hooks provided on the base 1 below the moving frame 42 as shown in FIG. 1. In each rotary hook 44, lower thread bobbins (not shown) are provided. )) Etc. are mounted.

  The multi-head embroidery machine according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

  First, a plurality of embroidery threads S drawn from the upper thread bobbins 11A, 11B, 11C,... Of the thread stand 11 are guided to the front surface side of the thread tension base 13 serving as a thread path forming base, and each first thread tension is determined. Hold between 19. As a result, the first thread tension 19 roughly adjusts the tension of the embroidery thread S on the respective biasing portions 19B side.

  Next, on the downstream side of the first thread tension 19, the embroidery thread S is wound around the spinning wheel 24 of the thread breakage detection device 21 by one turn and drawn downward. Wind one turn between the tension plates 30, 30 and pull it out to the thread take-up spring 33 side. When finely adjusting the tension to be applied to the embroidery thread S between the tension plates 30 and 30 of the second thread tension 27, the operator of the embroidery machine rotates the adjustment dial 31 around the support shaft 29 with a fingertip or the like. Turn to.

  As a result, since the screwing position of the adjustment dial 31 with respect to the support shaft 29 changes in each second thread tension 27, the spring force of the spring 32 can be variably adjusted by rotating the adjustment dial 31, and each embroidery thread S can be adjusted. The tension applied to the thread can be finely adjusted so that the thread tension is suitable for each type.

  Next, after the intermediate portion of the embroidery thread S is hooked on the thread hooking portion 33C of the thread take-up spring 33, the embroidery thread S is inserted into the thread hooking grooves 37A of the thread guide 37 one by one. Then, each embroidery thread S guided from the thread guide 37 is passed through the thread hooking portion 38B of the lower thread guide 38 and then drawn toward the thread insertion hole 39A of the balance 39, and the thread guide 39A is threaded through the thread insertion hole 39A. Each embroidery thread S is guided to the sewing needle 41 side through 38 thread insertion portions 38A.

  On the front side of the thread tension base 13, the first thread tension 19, the thread wheel 24, the second thread tension 27, and the thread take-up spring 33 are arranged in the left and right directions with a spacing C illustrated in FIG. These first thread tension 19, thread wheel 24, second thread tension 27 and thread take-up spring 33 allow the thread path of the embroidery thread S extending parallel to each other with a spacing C in the left and right directions on the front side of the thread tension base 13. Can be formed.

  Next, in this state, when the main shaft 9 is rotated by the main shaft motor 8 and the balance driving unit and the needle bar driving unit of the head unit 5 are operated, the needle bar 40 selected by the color changing mechanism 10 is driven by the needle bar. The sewing machine needle 41 can be driven up and down together with the sewing needle 41, and the sewing needle 41 can be moved with respect to the embroidery cloth on the moving frame 42 side. Further, the balance 39 selected by the color changing mechanism 10 is also driven up and down according to the rotation of the main shaft 9 by the balance driving unit.

  Then, the embroidery thread S of the desired color selected by the color changing mechanism 10 is one of the upper thread bobbins 11A, 11B, 11C,... On the thread stand 11 shown in FIG. Then, the thread is supplied to the sewing needle 41 side via the first thread tension 19, the thread wheel 24, the second thread tension 27, the thread take-up spring 33 and the like.

  During this time, the embroidery thread S is sewn on the embroidery cloth on the moving frame 42 side as the sewing needle 41 moves, and each time the sewing needle 41 forms a seam on the embroidery cloth, the embroidery thread S becomes sewn on the sewing needle 41 side. The embroidery pattern based on the embroidery data is formed.

  Thus, according to the present embodiment, the thread tension adjusting unit 12 that adjusts the tension of each embroidery thread S between the thread stand 11 and each balance 39 is provided with the thread tension base 13 and the plurality of first thread tensions 19. , The plurality of second thread tensions 27 and the plurality of thread take-up springs 33 and the like, the tension for each embroidery thread S extending on the thread tension base 13 from the thread stand 11 toward each balance 39, respectively. After the coarse adjustment with the first thread tension 19, fine adjustment can be performed using the second thread tension 27, and the tension for each embroidery thread S supplied to the balance 39 can be optimized.

  In addition, on the front side of the thread tension base 13 (front case 14), as shown in FIG. 4, a second thread tension 27 is disposed in a vertical position so that the second thread tension 27, the thread take-up from the position of each spinning wheel 24 can be obtained. A thread path is formed for each embroidery thread S that extends in a straight line parallel to each other to the position of the balance 39 via a spring 33. These embroidery threads S have a needle bar case with a spacing C between the left and right directions. In accordance with the interval of the balance 39 on the 7 side, the size is reduced to, for example, about 5 to 10 mm.

  Therefore, on the front side of the thread tension base 13, the embroidery thread S, which is the upper thread, is linearly formed at the shortest distance from the position of each spinning wheel 24 toward the balance 39 via the second thread tension 27 and the thread take-up spring 33. The length of the thread path for each embroidery thread S can be shortened, and an extra tension can be prevented from being applied to the embroidery thread S in the middle of these thread paths. Occurrence can be greatly reduced.

  Further, on the upper end side of the thread tension base 13 (front case 14), first thread tensions 19, 19,... Are arranged with a spacing C in the left and right directions via a thread tension plate 18, and these first threads are arranged. The tone 19 can be formed in a simple shape made of a leaf spring or the like. The spinning wheels 24 of the yarn breakage detecting device 21 can also be arranged at intervals in the left and right directions substantially corresponding to the interval C.

  In this case, the slit plates 25 of the yarn breakage detecting device 21 are staggered in the front and rear directions by the large-diameter shaft portions 22A and 23A of the rotary shafts 22 and 23 as shown in FIG. Since they are arranged so as to overlap with each other with D (for example, about 1 to 3 mm), the distance in the left and right directions of each spinning wheel 24 can be reduced to a dimension substantially corresponding to the distance C.

  The second thread tension 27 includes an L-shaped attachment plate 28 attached to the front side of the front case 14, a support shaft 29 that is fixed to the attachment plate 28 and extends in the left and right directions, A pair of tone trays 30 and 30 that are inserted on the outer peripheral side of the support shaft 29 and clamp the embroidery thread S from the left and right sides, and are screwed onto the distal end side of the support shaft 29 to finely adjust the tension of the embroidery thread S. And an adjustment dial 31 provided between the tension plate 30 and the adjustment dial 31, and a spring 32 whose spring force is variably adjusted by the adjustment dial 31. 27 tension plates 30, adjustment dials 31 and the like are arranged on the front side of the thread tension table 13 in a vertically placed state, not horizontally.

  Accordingly, the entire second thread tension 27 can be disposed in parallel with the support shaft 29 extending leftward and rightward on the front surface side of the thread tension base 13, and the second thread tension 27 on the thread tension base 13 can be arranged. Occupied space can be greatly reduced compared to the prior art. And, all of the plurality of second thread tensions 27, 27,... Can be arranged in a line in the left and right directions and compactly arranged with respect to the thread tension stand 13, and the interval between the second thread tensions 27 can be The distance can be reduced to a distance C substantially corresponding to the distance between the balances 39.

  As a result, the embroidery threads S can be linearly arranged at the shortest distance from the second thread tension 27 to the balance 39, and the length of the thread path for each embroidery thread S can be reliably shortened. Also, the first thread tensions 19, 19,... Having a simple structure are arranged on the thread tension table 13 with a small occupied space (interval C in the left and right directions) in substantially the same manner as the second thread tensions 27. Thus, the overall external dimensions of the thread tension table 13 can be reduced.

  Therefore, according to the present embodiment, multi-color embroidery is performed by arranging a plurality of second thread tensions 27, 27,... A plurality of second thread tensions 27 corresponding to the number of embroidery threads S can be arranged on the thread tension base 13 (front case 14) with a small occupied space, and the width dimension (left and right dimension) of the thread tension base 13 ) And height dimensions (upper and lower dimensions) can both be reduced and the size can be reduced.

  Thereby, the head part 5 of the embroidery machine including the thread tension base 13 can be reduced in size, and the entire head part 5 can be formed compactly. In particular, in a multi-head embroidery machine in which three head portions 5 are mounted on a base 1 as shown in FIG. 1, the left and right dimensions of the head portion 5 are shortened and the distance between the head portions 5 is reduced. Can be made small, and the entire embroidery machine can be miniaturized to save space.

  Further, since the head portion 5 of the embroidery machine is constituted by the head main body 6, the needle bar case 7, the thread tension base 13 (thread tension adjusting portion 12), etc., any one of the plurality of embroidery threads S is included. When the embroidery thread S is selected by the color changing mechanism 10, the needle bar case 7 and the thread tension base 13 are moved relative to the head body 6 in the left and right directions (indicated by arrows A and B in FIG. 1). The balance 39 and the sewing needle 41 corresponding to the embroidery thread S at this time can be selectively driven by the drive unit of the head body 6.

  At this time, since the thread tension base 13 is moved integrally with the needle bar case 7 in the left and right directions, for example, each balance 39 of the needle bar case 7 and each second thread tension 27 of the thread tension base 13, Each embroidery thread S can be held in a state of being substantially linearly aligned with each thread take-up spring 33. Further, the respective thread paths formed for each embroidery thread S on the thread tension base 13 can be formed as thread paths that extend in parallel and in a straight line, and each embroidery thread S (thread path). The length of the thread can be shortened, the occurrence of thread breakage and the like can be satisfactorily suppressed, and the quality of the embroidery pattern can be improved.

  Further, the first thread tension 19, the thread wheel 24, the second thread tension 27, and the thread take-up spring 33 provided on the thread tension table 13 are used to simply apply the thread when the operator of the embroidery machine performs threading of the embroidery thread S. For example, an operation for inserting a thread into a small threading hole or the like can be made unnecessary, so that the threading operation for each embroidery thread S can be greatly simplified.

  In particular, with respect to the second thread tension 27 arranged vertically on the front side of the thread tension base 13, a support shaft 29 extending in the left and right directions so as to cross the yarn path, a pair of tension plates 30, an adjustment dial 31, and Since it is constituted by the spring 32 and the like, the operator of the embroidery machine winds the embroidery thread S from the front side of the thread tension base 13 by one turn on the outer peripheral side of the support shaft 29 between the pair of tension plates 30 and 30. Then, the embroidery thread S can be easily attached to the second thread tension 27, and the embroidery thread S can be held between the pair of tension plates 30 and 30.

  Then, by turning an adjustment dial 31 screwed to the front end side of the support shaft 29 from the front side of the thread tension base 13 by manual operation or the like, the spring force of the spring 32 (the clamping force of the embroidery thread S by the tension tray 30) ) Can be easily adjusted, and the tension applied to the embroidery thread S can be finely adjusted so as to be a thread tension suitable for each type.

  Further, on the front side of the thread tension base 13, a plurality of embroidery threads S extend linearly up and down in the direction of each other at intervals C shown in FIG. The position and arrangement of each S can be easily confirmed, and the thread tension adjustment work suitable for each embroidery thread S can be accurately performed using the adjustment dial 31 of the second thread tension 27. Can be reduced.

  Further, the thread take-up springs 33 provided between the second thread tensions 27 and the balances 39 and provided on the lower side of the thread tension stand 13 also have left and right spacings (corresponding to the spacings of the balances 39). For example, since the thread take-up spring 33 is arranged in a parallel state with an interval C) shown in FIG. 4 and the thread take-up spring 33 bends and deforms in the front and rear direction of the thread tension table 13, the space between the second thread tension 27 and the balance 39 is Thus, the embroidery thread S is not bent in the left and right directions by the thread take-up spring 33, and the thread take-up spring 33 can be bent and deformed in the front and rear directions of the thread tension base 13 to adjust the thread tension.

  Also by this, the thread paths of the embroidery thread S from the second thread tension 27 to the balance 39 can be linearly arranged at the shortest distance, and the length of the thread path for each embroidery thread S can be shortened. Further, on the yarn hooking portion 33C side of the thread take-up spring 33, the middle portion of the embroidery thread S is hooked and follows the movement of the balance 39, so that it bends and deforms in the forward and backward directions of the thread tension base 13, so that the balance 39 The tension of the embroidery thread S can be adjusted to an appropriate magnitude while moving up and down, and the embroidery thread S can be fed toward the balance 39 with low friction.

  In addition, the spinning wheel 24 provided between the first thread tension 19 and the second thread tension 27 and provided on the front side of the thread tension base 13 is wound around the middle part of the embroidery thread S. Since the rotation follows the movement, the rotation of the spinning wheel 24 is transmitted to each slit plate 25 via the rotation shafts 22 and 23, and the rotation of the slit plate 25 is consumed (supplied) using the photosensor 26. ) As well as the rotation of the spinning wheel 24 and the slit plate 25, it is possible to immediately detect when the embroidery thread S (upper thread and lower thread) is broken.

  Next, FIGS. 13 to 15 show a second embodiment of the present invention. The feature of this embodiment is that the first thread tension is changed to a spring force adjustment type, and the thread take-up spring is changed to a simple shape. It is in the configuration to do. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 51 denotes a yarn tension adjusting unit that adjusts the tension of the embroidery thread S. The yarn tension adjusting unit 51 is configured in substantially the same manner as the yarn tension adjusting unit 12 described in the first embodiment, and the yarn path. A thread tension base 52 as a forming base, a first thread tension 55, a thread wheel 24, a second thread tension 27, a thread take-up spring 60, and the like, which will be described later, are provided.

  However, the thread tension base 52 in this case has a plurality of embroidery threads S on the front surface (front surface) side from the position of each first thread tension 55 to each second thread tension 27, each thread take-up spring 60, etc. as shown in FIG. A thread path is formed for each embroidery thread S that extends parallel to each other with a spacing C of, for example, about 5 to 10 mm, and extends substantially straight in the left and right directions. .

  Here, the thread tension base 52 includes a front case 53, a back cover 15, a mounting bracket 16, and the like, similar to the thread tension base 13 described in the first embodiment. However, the thread tension base 52 in this case is formed in a shape in which the shape of the front case 53 is different in accordance with a thread take-up spring 60 described later.

  That is, similarly to the front case 14 described in the first embodiment, the front case 53 is provided with a step portion 53A, a bearing portion, a spring bearing, and a pedestal portion (all not shown). However, the front case 53 in this case is provided with spring mounting portions 53E, 53E,... For the thread take-up spring 60, which will be described later, on the lower side of the front case 53, instead of the openings 14E described in the first embodiment. Are formed with an interval in the left and right directions substantially corresponding to.

  Reference numeral 54 denotes a thread tension plate provided on the front upper end side of the front case 53. The thread tension plate 54 is configured in substantially the same manner as the thread tension plate 18 described in the first embodiment. However, the thread tension plate 54 in this case is provided with a first thread tension 55 to be described later with a gap C (for example, about 5 to 10 mm) in the left and right directions.

  55 are a plurality of first thread tensions attached to the thread tension plate 54. These first thread tensions 55 are formed in a rectangular shape as shown in FIG. A back plate 56, a stacking plate 57 that is superposed on the back plate 56 from the front side and stopped by claw portions 57 A, 57 A,..., And penetrates the stacking plate 57 and the back plate 56. A spring force adjusting type thread tension is constituted by an adjusting screw 58 provided with the tip end screwed to the thread tension plate 54 and a coil spring 59 disposed on the outer peripheral side of the adjusting screw 58.

  Here, the back plate 56 of the first thread tension 55 is fixed in advance to the thread tension plate 54 with a spacing C in the left and right directions, for example. An embroidery thread S, which is an upper thread, is inserted between the back plate 56 and the overlap plate 57 so as to extend upward and downward, and a coil spring 59 is attached so that the overlap plate 57 faces the back plate 56. By energizing, tension is applied to the embroidery thread S between the back plate 56 and the overlapping plate 57.

  The urging force of the coil spring 59 is variably adjusted by the operator of the embroidery machine turning the adjustment screw 58, whereby the tension of the embroidery thread S is adjusted between the back plate 56 and the overlap plate 57. Coarse adjustment is made as the clamping force. Further, in this case, the first thread tension 55 is arranged at intervals C in the left and right directions as shown in FIG. 13, and the respective embroidery threads S are directed toward the spinning wheel 24, the second thread tension 27, the thread take-up spring 60, and the like. Are arranged so as to extend linearly.

  , 60 are thread take-up springs provided on the spring mounting portions 53E, 53E,... Of the front case 53, respectively. Each thread take-up spring 60 has the same function as the thread take-up spring 33 described in the first embodiment. The low-friction feeding of the embroidery thread S is performed between the second thread tension 27 and the balance 39.

  However, the thread take-up spring 60 in this case is formed as a thin plate-like body using a leaf spring material as shown in FIG. 15, and a threading portion 60A through which the embroidery thread S is inserted is provided at the lower end side. Yes. Further, the upper end side of the thread take-up spring 60 is fixed to the spring mounting portion 53E of the front case 53 shown in FIG. 13 by using means such as screwing, caulking, adhesion, or welding. The thread take-up springs 60 are arranged at intervals substantially corresponding to the interval C in the left and right directions of the front case 53.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. However, in the present embodiment, the first thread tension 55 is configured as a spring force adjustment type thread tension composed of the back plate 56, the overlapping plate 57, the adjustment screw 58 and the coil spring 59.

  Therefore, the operator of the embroidery machine can variably and roughly adjust the tension to be applied to the embroidery thread S by rotating the adjustment screw 58 of the first thread tension 55 from the front side of the front case 53. The first thread tension 55 extends so that each embroidery thread S extends linearly toward the spinning wheel 24, the second thread tension 27, the thread take-up spring 60 and the like with a spacing C in the left and right directions as shown in FIG. Can be arranged.

  Further, the thread take-up spring 60 can be formed into a simple shape by a plate spring made of a thin metal plate or the like, and the structure can be simplified. Then, the thread take-up spring 60 bends and deforms the threading portion 60A through which the embroidery thread S is inserted following the movement of the balance 39 in the direction indicated by the arrow F in FIG. Can be adjusted.

  In the first embodiment, the case where the first thread tension 19 is formed in a simple structure by a leaf spring or the like has been described as an example. However, the present invention is not limited to this. For example, the first thread tension 55 described in the second embodiment may be used in place of the first thread tension 19. Also, the thread take-up spring 33 may be used in place of the thread take-up spring 60 described in the second embodiment.

  In each of the above embodiments, the case where a total of three head portions 5 are provided on the base 1 of the embroidery machine has been described as an example. However, the present invention is not limited to this. For example, the present invention may be applied to a single-head embroidery machine having a single head portion 5, and a multi-head embroidery machine having two or more head portions 5. You may apply to.

1 is a front view showing a multi-head embroidery machine according to a first embodiment of the present invention. FIG. 2 is a right side view of FIG. 1 showing a part of the embroidery machine in a cutaway view. FIG. 3 is a partially cutaway side view showing an enlarged head portion in FIG. 2. It is a front view which expands and shows the head part in FIG. It is sectional drawing which looked at the thread tension adjustment part from the arrow VV direction in FIG. It is a fragmentary perspective view which expands and shows the thread tension plate in FIG. 4 with the 1st thread tension. It is a perspective view which expands and shows the 1st thread tension in FIG. It is sectional drawing seen from the arrow VIII-VIII direction in FIG. 5 which shows a thread break sensor. It is a perspective view which shows the spinning wheel in FIG. 8, a rotating shaft, and a slit board. It is a perspective view which expands and shows the 2nd thread tension 27 in FIG. It is a perspective view which expands and shows the thread take-up spring in FIG. FIG. 6 is an exploded perspective view showing a spring bearing, a spring shaft, a thread take-up spring, a presser plate, and the like in FIG. 5. It is a front view which shows the head part by 2nd Embodiment. It is a perspective view which expands and shows the 1st thread tension in FIG. It is a perspective view which expands and shows the thread take-up spring in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2, 3 Side frame 4 Head support body 5 Head part 6 Head main body 7 Needle bar case 8 Spindle motor (drive source)
9 Spindle 10 Color change mechanism 11 Thread stand (upper thread storage)
12, 51 Yarn tension adjusting unit 13, 52 Thread tension stand (yarn path forming stand)
14, 53 Front case 16 Mounting bracket 19, 55 First thread tension 21 Thread breakage detecting device 22, 23 Rotating shaft 24 Spindle (rotating body)
25 Slit plate 26 Photo sensor (rotation detection means)
27 Second thread tension 28 Mounting plate 29 Support shaft 30 Condition tray 31 Adjustment dial 32 Spring 33, 60 Thread take-up spring 34 Spring shaft 35 Presser plate 37, 38 Thread guide 39 Balance 40 Needle bar 41 Sewing needle 42 Moving frame 43 Frame moving motor (Drive source)
44 Rotary hook S Embroidery thread (upper thread)

Claims (4)

A base provided with a driving source for embroidery, a plurality of sewing needles mounted on the base for performing multicolor embroidery and a head provided with a plurality of scales, and a sewing needle and a balance of the head An upper thread storage unit for storing upper threads of a plurality of colors for supplying the upper thread, and a tension between the upper thread storage unit and the balance, which are provided between the upper thread storage unit and the balance, are adjusted. An embroidery machine including a thread tension adjusting unit
The yarn tension adjusting unit is attached to the head unit, and forms a yarn path for each upper thread extending from the upper thread storage unit to each balance,
A plurality of first thread tensions that are located upstream of the yarn path and are arranged in parallel on the yarn path forming table, respectively, and individually roughly adjust the tension of each upper thread;
A plurality of second thread tensions which are located between the first thread tensions and the balances and are provided in parallel on the yarn path forming base and finely adjust the tensions of the upper threads individually. And
The plurality of second thread tensions are arranged vertically on the yarn path forming table at intervals substantially corresponding to the intervals of the respective balances, and the respective thread paths of the yarn path forming table are directed to the respective balances to the left, An embroidery machine configured to be formed as a thread path extending in a straight line parallel to each other in the right direction.   Each of the second thread tensions is parallel to the surface of the yarn path forming base and extends to the left and right so as to cross the thread path, and is inserted into the outer peripheral side of the support shaft, and the upper thread A pair of tone dishes sandwiching the left and right sides, an adjustment dial screwed to the support shaft to finely adjust the tension of the upper thread, and one of the pair of tone dishes The embroidery machine according to claim 1, wherein the embroidery machine is configured by a spring disposed between the adjusting dial and the adjusting dial so that the spring force is variably adjusted by the adjusting dial.   The yarn tension adjusting section of the yarn tension adjusting section is located between each second thread tension and each balance, and a middle portion of each upper thread is latched to follow the movement of the balance and bend and deform. 3. The embroidery machine according to claim 1, wherein a plurality of thread take-up springs are provided, and the respective thread take-up springs are arranged in a parallel state with intervals in the left and right directions substantially corresponding to the intervals of the balances.   On the yarn path forming stand of the yarn tension adjusting unit, a middle portion of each upper thread is wound between the first thread tension and the second thread tension to detect thread breakage. A plurality of rotating bodies that rotate following the movement of the upper thread are provided, and each rotating body is arranged in a parallel state with an interval in the left and right directions substantially corresponding to the interval between the second thread tensions. The embroidery machine according to claim 1, 2 or 3.

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