JP2009011561A - Tool holder, processing unit and sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to mount a tool holder equipped with tools on a chuck part of the spindle or at least one chuck part of a needle bar and a presser bar in a reliable and detachable manner and to downsize the chuck part. <P>SOLUTION: The tool holder 31 has an engaging shaft 31a at its upper end, a first annular tapered surface 31b which continues from the lower end of the engaging shaft 31a downward, a second annular tapered surface 31c which continues from the lower end of the first annular tapered surface 31b downward, a tool attaching part 31d which continues from the second annular tapered surface 31c downward and an annular V-shaped groove 31e which continues from the tool attaching part 31d downward and the like. The first annular tapered surface 31b is formed so that the first inclination angle formed with the horizontal plane may be about 45°. The second annular tapered surface 31c is formed so that the second inclination angle formed with the horizontal plane may be larger than the first inclination angle of the first annular tapered surface 31b, that is, may be about 70°. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a tool holder on which a tool is mounted, a processing device for detachably mounting the tool holder on a chuck portion of a spindle, and a tool bar on which a needle bar is detachably mounted on at least one chuck portion of a presser bar. It is related to the sewing machine.

  Conventionally, an electronic sewing machine such as a lockstitch sewing machine has a needle bar on which a sewing needle is detachably attached to a lower end, and a needle bar is driven up and down by a sewing machine motor via a main shaft to In cooperation, it is possible to form seams on the work cloth. By the way, various needle stoppers have been proposed in which a sewing needle can be easily attached to a needle bar with a single touch.

  For example, a needle stopper device for a sewing machine described in Patent Document 1 is provided inside a needle shank adapter (30) in which a neck portion (331) and a fitting portion (321) having a tapered outer peripheral surface (323) are integrally formed. The upper end of the sewing needle (10) is partially inserted and held from below, and the upper half of this needle shank adapter (30) is inserted into the lower end of the needle bar (20) from below and attached. I have to do it.

At this time, the tapered outer peripheral surface (323) of the needle shank adapter (30) abuts the holding hole (23) having the tapered inner peripheral surface (231) formed at the lower end portion of the needle bar (20), and elastic A pair of engaging pins (25, 27) that are biased and protrude into the lower end of the needle bar (20) engage with the neck (331) of the needle shank adapter (30), and the needle shank adapter ( When 30) is mounted and held at the lower end of the needle bar (20), it is prevented from coming off.
Japanese Utility Model Publication No. 63-30977 (pages 3 to 5, FIGS. 2 and 4)

  In the needle stop device for a sewing machine described in Patent Document 1, when a needle shank adapter having a sewing needle is inserted into the lower end of the needle bar and attached, a tapered holding hole formed inside the lower end of the needle bar In addition, since the connection structure is such that the tapered outer surface of the needle shank adapter is in contact with the needle shank adapter, the large load acting on the needle shank adapter and the rotational moment acting on the needle shank adapter can be received only by this tapered holding hole. There is a need.

  In this case, a load acting upward on the needle shank adapter can be received by the holding hole by reducing the inclination angle formed between the tapered surface of the holding hole and the horizontal plane, for example, 30 ° to 45 °. Even if it can, the rotational moment generated in the needle shank adapter cannot be eliminated. In addition, when the load acting upward is large, it is necessary to increase the width of the tapered holding hole, and there is a problem that the needle bar forming the holding hole becomes thick.

  Therefore, by increasing the inclination angle formed between the tapered surface of the holding hole and the horizontal surface, for example, 60 ° to 70 °, the needle bar is moved by the occurrence of advancing input that bites by the wedge action of the tapered surface. Without being thickened, the rotational moment generated in the needle shank adapter can be received and eliminated. However, on the other hand, the longitudinal dimension of the tapered holding hole becomes large, and it becomes impossible to receive a load acting upward on the needle shank adapter. Furthermore, there is a problem that the needle shank adapter is excessively engaged with the holding hole, that is, the lower end portion of the needle bar, and the needle shank adapter cannot be pulled downward.

  An object of the present invention is to allow a tool holder with a tool mounted thereon to be securely and detachably mounted to a chuck portion of a spindle or at least one chuck portion of a needle bar and a presser bar, and to reduce the size of the chuck portion. It is to be.

  The tool holder according to claim 1 is a tool holder that is detachably attached to a chuck portion of a main shaft provided in a machining apparatus with a tool attached thereto, from an engagement shaft portion at an upper end portion and a lower end of the engagement shaft portion. A first annular taper surface that continues downward, and a second annular taper surface that continues downward from the lower end of the first annular taper surface, and a second inclination angle formed with a horizontal plane of the second annular taper surface is the first annular taper surface This is configured to be larger than the first inclination angle formed with the horizontal plane.

  When the tool holder is mounted on the chuck portion of the main shaft, the engagement shaft portion, the first annular tapered surface, and the second annular tapered surface engage with the annular engagement surface of the chuck portion, respectively. At this time, the second inclination angle formed with the horizontal surface of the second annular engagement surface of the chuck portion engaged with the second annular tapered surface is the first annular engagement surface of the chuck portion engaged with the first annular tapered surface. Therefore, even when a large load acts on the tool holder, this large load can be reliably received by the first annular engagement surface having the first inclination angle.

  In addition, by receiving this large load with the second annular engagement surface having the second inclination angle larger than the first inclination angle, the tool holder is subjected to an advance input that bites into the chuck portion due to the wedge action. . Therefore, the tool holder can be securely and firmly attached to the chuck portion by eliminating the rattling.

  By appropriately combining the sizes of the two first and second annular engagement surfaces on the chuck part side, the width dimension and vertical dimension of the chuck part are ideally shortened, that is, the chuck part can be made compact. become. Moreover, since the biting force of the tool holder with respect to the chuck portion when the tool holder is mounted on the chuck portion is not large, it is possible to reliably prevent the tool holder from excessively engaging the chuck portion, The tool holder can be easily pulled out from the chuck portion.

  The processing apparatus according to claim 2 is a processing apparatus in which a tool holder on which a tool is mounted is detachably mounted on a chuck portion of a main shaft. The tool holder is formed from an engagement shaft portion at an upper end portion and a lower end of the engagement shaft portion. A second annular taper surface that continues downward and a second annular taper surface that continues downward from the lower end of the first annular taper surface, and a second inclination angle formed with the horizontal plane is the first angle formed with the horizontal plane of the first annular taper surface. The chuck portion has an engagement hole into which the engagement shaft portion of the tool holder is fitted, and a first annular taper surface connected to a lower end of the engagement hole. A first annular engagement surface that can be engaged, and a second annular engagement surface that is continuous with the lower end of the first annular engagement surface and can be engaged with the second annular tapered surface.

  When the tool holder is mounted on the chuck portion of the main shaft, the engagement shaft portion, the first annular tapered surface, and the second annular tapered surface of the tool holder are respectively connected to the engagement hole, the first annular engagement surface, and the first annular engagement surface. Engages with two annular engagement surfaces. At this time, the second inclination angle formed with the horizontal surface of the second annular engagement surface with which the second annular taper surface engages is the first angle formed with the horizontal surface of the first annular engagement surface with which the first annular taper surface engages. Since it is larger than 1 inclination angle, it acts similarly to the above-mentioned claim 1.

  According to a third aspect of the present invention, there is provided a sewing machine including a needle bar that is driven up and down by a sewing motor through a main shaft of the sewing machine and a presser bar for mounting a presser foot that presses a work cloth. A chuck portion provided at one lower end portion and a plurality of types of tools that can be attached to and detached from the chuck portion, each of which includes a plurality of types of tools having a tool holder. The first annular taper surface that continues downward from the lower end of the engagement shaft portion, and the second annular taper surface that continues downward from the lower end of the first annular taper surface, and the angle formed by the horizontal plane is the first annular The chuck portion has an engagement hole into which the engagement shaft portion of the tool holder is fitted, and a lower end of the engagement hole and is engaged with the first annular taper surface. A first annular engagement surface that can be mated, and the first annular engagement surface Continuous to the lower end of the mating surface and has a second annular tapered surface engagable with the second annular engagement surface.

  Since the chuck part is provided at the lower end of at least one of the needle bar and the presser bar, when the tool holder is mounted on the chuck part, the engaging shaft part of the tool holder, the first annular taper surface, and the second annular taper surface Are engaged with the engagement hole, the first annular engagement surface, and the second annular engagement surface of the chuck portion, respectively. At this time, the second inclination angle formed with the horizontal surface of the second annular engagement surface with which the second annular taper surface engages is the first angle formed with the horizontal surface of the first annular engagement surface with which the first annular taper surface engages. Since it is larger than 1 inclination angle, it acts similarly to the above-mentioned claim 1.

  According to a fourth aspect of the present invention, there is provided a sewing machine according to the third aspect, wherein an annular groove is provided in an outer peripheral portion at a lower portion of the engagement shaft portion, and an engagement shaft of the tool holder is provided on the chuck portion via a ball engaged with the annular groove. A ball lock mechanism for locking the portion is provided.

  According to a fifth aspect of the present invention, the sewing machine according to the third or fourth aspect is provided with a key mechanism for rotationally restraining the tool holder to the chuck portion.

  A sewing machine according to a sixth aspect of the present invention is the sewing machine according to any one of the third to fifth aspects, wherein the tool includes a sewing needle, a cloth presser, a cutter for cutting the work cloth, and a drawing pen for drawing on the work cloth.

  According to the first aspect of the present invention, in the tool holder that is detachably mounted on the chuck portion of the main shaft provided in the machining apparatus after mounting the tool, the engagement shaft portion of the upper end portion, the first annular tapered surface, The second annular taper surface, and the second inclination angle formed with the horizontal surface of the second annular taper surface is greater than the first inclination angle formed with the horizontal surface of the first annular taper surface. Even when a large load is applied to the tool holder attached to the chuck portion, the large load can be reliably received by the first annular engagement surface having the first inclination angle. In addition, by receiving this large load with the second annular engagement surface having the second inclination angle larger than the first inclination angle, the tool holder is subjected to an advance input that bites into the chuck portion due to the wedge action. . Therefore, the tool holder can be securely and firmly attached to the chuck portion by eliminating the rattling.

  Furthermore, by appropriately combining the sizes of the two first and second annular engagement surfaces on the chuck part side, the width dimension and the vertical dimension of the chuck part are ideally shortened, that is, the chuck part is made compact. Is possible. Moreover, since the biting force of the tool holder with respect to the chuck portion when the tool holder is mounted on the chuck portion is not large, it is possible to reliably prevent the tool holder from excessively engaging the chuck portion, The tool holder can be easily pulled out from the chuck portion.

  According to the second aspect of the present invention, in the machining apparatus for detachably mounting the tool holder on which the tool is mounted on the chuck portion of the main shaft, the tool holder includes the engagement shaft portion at the upper end portion, the first annular tapered surface, and the second annular surface. Since the chuck portion has an engagement hole, a first annular engagement surface, and a second annular engagement surface, when the tool holder is mounted on the chuck portion of the main shaft, the engagement shaft portion of the tool holder And the first annular tapered surface and the second annular tapered surface engage with the engaging hole, the first annular engaging surface, and the second annular engaging surface of the chuck portion, respectively. The second inclination angle formed with the horizontal plane of the second annular engagement surface engaged with the second annular tapered surface is the first inclination angle formed with the horizontal plane of the first annular engagement surface engaged with the first annular tapered surface. Therefore, the same effect as in the first aspect can be obtained.

  According to a third aspect of the present invention, in a sewing machine comprising a needle bar that is driven up and down by a sewing machine motor via a sewing machine main shaft and a presser bar for mounting a presser foot that presses a work cloth, the needle bar and the presser bar A chuck portion provided at at least one lower end portion of the tool, and a plurality of types of tools that can be attached to and detached from the chuck portion, each having a tool holder, and the tool holder is engaged with the upper end portion. The shaft portion has a first annular tapered surface and a second annular tapered surface, and the chuck portion has an engagement hole, a first annular engagement surface, and a second annular engagement surface. When mounted on the part, the engaging shaft part of the tool holder, the first annular tapered surface, and the second annular tapered surface are respectively connected to the engaging hole, the first annular engaging surface, and the second annular engaging surface of the chuck part. Engage. The second inclination angle formed with the horizontal plane of the second annular engagement surface engaged with the second annular tapered surface is the first inclination angle formed with the horizontal plane of the first annular engagement surface engaged with the first annular tapered surface. Therefore, the same effect as in the first aspect can be obtained.

According to the invention of claim 4, an annular groove is provided on the outer peripheral portion of the lower portion of the engagement shaft portion,
Since the chuck portion is provided with a ball lock mechanism that locks the engagement shaft portion of the tool holder through a ball that engages with the annular groove, the engagement shaft portion of the tool holder is chucked through the ball lock mechanism. It is possible to easily and reliably attach the tool holder to the tool holder chuck portion by simply fitting it in the engaging hole of the portion, and it is possible to easily remove it from the chuck portion by simply pulling out the tool holder. Other effects similar to those of the third aspect are achieved.

  According to the invention of claim 5, since the key mechanism for rotationally restraining the tool holder to the chuck portion is provided, the phase of the tool holder with respect to the chuck portion when the tool holder is mounted on the chuck portion can be positioned. In addition, the rotation of the tool holder in the mounted state can be reliably prevented. Other effects similar to those of the third or fourth aspect are achieved.

  According to the invention of claim 6, the tool includes a sewing needle, a cloth presser, a cutter for cutting the work cloth, and a drawing pen for drawing on the work cloth. By using these tools in combination, the work cloth In addition to sewing, various work related to sewing can be performed, such as cutting the work cloth and drawing or marking a sewing line on the work cloth. Other effects similar to those of any one of claims 3 to 5 are achieved.

  The tool holder of the present embodiment includes an engagement shaft portion at an upper end portion, a first annular taper surface that continues downward from the lower end of the engagement shaft portion, and a second annular taper surface that continues downward from the lower end of the first annular taper surface. The second inclination angle formed with the horizontal plane of the second annular tapered surface is configured to be larger than the first inclination angle formed with the horizontal plane of the first annular tapered surface. The chuck portion provided at the lower end of the sewing machine needle bar and presser bar to which the tool holder is mounted, or the chuck portion of the main spindle of the processing apparatus is provided with an engagement hole into which the engagement shaft portion of the tool holder is fitted. A first annular engagement surface that is continuous with the lower end of the mating hole and engageable with the first annular tapered surface, and a second annular engagement that is continuous with the lower end of the first annular engagement surface and engageable with the second annular tapered surface And having a surface.

First, a case where the tool holder is mounted on the needle bar chuck portion provided on the pattern sewing machine 10 and the presser bar chuck portion 14 will be described.
As shown in FIGS. 1 to 3, the pattern sewing machine 1 is placed on a base table 2, a bed portion 3, a pedestal portion 4 erected from the rear end portion of the bed portion 3, and An arm portion 5 that extends forward from the upper end portion of the pedestal portion 4 so as to face the bed portion 3, a cloth holding mechanism 9, and a cloth feeding device 10 are provided.

  The pattern sewing machine 1 is further provided with a needle bar chuck portion 12 provided at the lower end portion of the needle bar 7 (see FIGS. 6 and 7) and a lower end portion of the presser bar 8 (see FIG. 6). A first tool magazine 16 containing a presser bar chuck portion 14 (see FIG. 6) and a plurality of types of tools 30, 35, 40 and 45 (see FIGS. 4 and 9 to 11) to be mounted on the needle bar chuck portion 12. The second tool magazine 18 storing a plurality of types of tools 50, 55, 60 (see FIGS. 12 to 14) to be mounted on the presser bar chuck portion 14, and the tools 30, 35 mounted on the needle bar chuck portion 12. , 40, 45 and the first tool changer 20 for exchanging the tools 30, 35, 40, 45 of the first tool magazine 16, the tools 50, 55, 60 mounted on the presser bar chuck portion 14 and the second tool magazine. 2nd to exchange 18 tools 50, 55, 60 Ingredients exchanging device 22 and the like.

  That is, as shown in FIG. 1, the first tool magazine 16 and the second tool magazine 18 are respectively provided at positions substantially symmetrical with respect to the arm portion 5 of the pattern sewing machine 1, and the first tool replacement is performed. The device 20 and the second tool changer 22 are provided at positions substantially symmetrical with respect to the arm portion 5 of the pattern sewing machine 1, respectively.

  A sewing machine main shaft 24 (see FIG. 20) is disposed inside the arm unit 5, and a sewing machine motor 25 for rotating the sewing machine main shaft 24 is provided at the rear end of the arm unit 5, and the needle bar 7 is placed at the uppermost position. A lock mechanism 26 (see FIG. 20) for locking the rotation of the sewing machine main shaft 24 is provided in order to maintain the position. A needle bar 7 and a presser bar 8 are disposed inside the front portion of the arm portion 5 so as to be movable up and down, and a needle bar vertical drive mechanism 27 (up and down) that drives the needle bar 7 up and down by the rotation of the sewing machine main shaft 24. Etc.) are provided. Since the needle bar 7, the presser bar 8, and the needle bar up / down drive mechanism 27 are known techniques, a detailed description thereof will be omitted here.

  The bed 3 includes a cloth holding mechanism 9 to be described later and a cloth feeding device 10 that moves the cloth holding mechanism 9 in the Y direction (front-rear direction) and the X direction (left-right direction). There is provided a rotary hook that forms a pattern seam in time with the vertical movement of the rod 7, a lower shaft that transmits the rotational driving force of the sewing machine motor 25 to the rotary hook via a connecting rod connected to the sewing machine main shaft 24, and the like. ing.

  A mounting table 6 made of a rectangular plate material is fixed to the upper surface of the bed 3. A proximal end portion of a presser arm 9a that is curved and cantilevered in a side view so as to face a strip-shaped notch formed in the rear half of the center portion of the mounting table 6 in the left-right direction ( (Rear end portion) is disposed and fixed to the upper surface of an X-direction moving body (not shown). A rectangular frame-shaped cloth holding frame 9b is provided at the tip of the presser arm 9a so as to be movable up and down in plan view. By switching the upper cloth holding frame 9b to the pressed position, the upper cloth holding frame 9b and the cloth receiving plate 9c made of a rectangular plate material are provided on the lower side. Is provided with a cloth holding mechanism 9 (not shown).

  Further, inside the bed portion 3, an X-direction drive mechanism (not shown) that moves the cloth holding mechanism 9 in the X direction by an X-direction drive motor 10 a (see FIG. 23), and the cloth holding mechanism 9 is driven in the Y direction. A cloth feeding device 10 (not shown) having a Y-direction drive mechanism (not shown) that is moved in the Y direction by a motor 10b (see FIG. 23) is provided. Since both the cloth holding mechanism 9 and the cloth feeding device 10 are well-known technologies, detailed description thereof is omitted here.

  Next, a plurality of types of tools 30, 35, 40, 45 that can be attached to and detached from a needle bar chuck part 12 and a presser bar chuck part 14 described later and have tool holders 31, 36, 41, 46, 51, 56, 61. , 50, 55, 60 will be described. However, since the tool holders 31, 36, 41, 46, 51, 56, and 61 of these plural types of tools 30, 35, 40, 45, 50, 55, and 60 are configured in the same manner, the sewing needles are used here. The tool 30 attached to the lower end as the tool body 32 will be described.

  As shown in FIGS. 4 and 5, the tool 30 includes a tool holder 31 and a tool body 32 that is a sewing needle detachably attached to the tool holder 31.

  The tool holder 31 has a substantially cylindrical shape, an engagement shaft portion 31a at the upper end portion, a first annular taper surface 31b continuous downward from the lower end of the engagement shaft portion 31a, and a lower end of the first annular taper surface 31b. A second annular tapered surface 31c extending downward from the second annular tapered surface 31c, a tool attaching portion 31d continuing downward from the second annular tapered surface 31c, an annular V-groove 31e continuing downward from the tool attaching portion 31d, and a tool body 32 as a sewing needle. The mounting hole 31f for attaching the upper end of the positioning key 30a and the like.

  A constricted annular groove 31g is formed on the outer peripheral portion of the lower portion of the engagement shaft portion 31a, and can be engaged with a steel ball 13a (ball) of a ball lock mechanism 13 described later provided in the needle bar chuck portion 12. It has become. The first annular taper surface 31b is formed so as to be continuous with the lower end of the annular groove 31g and have a first inclination angle with the horizontal plane of about 45 °. The second annular taper surface 31c that continues below the first annular taper surface 31b has a second inclination angle with the horizontal plane that is approximately 70 ° greater than the first inclination angle of the first annular taper surface 31b. Is formed.

  The tool attachment portion 31d has a cylindrical shape and has a downward attachment hole 31f formed therein. Therefore, the tool body 32 is detachably fixed by a set screw 33 in a state where the upper end portion is inserted into the attachment hole 31f. The upper end portion of the vertically long yarn guide member 34 is fixed to one side portion of the tool attachment portion 31d by a fixing screw 34a. When the tool 30 is replaced by rotating a first change arm 20A of the first tool changer 20, which will be described later, the annular V groove 31e is provided with a first grip 96a or a second grip at the tip of the first change arm 20A. It is formed for gripping by the portion 97a.

  On one side extending from the second annular tapered surface 31c of the tool holder 31 to the upper half of the tool mounting portion 31d, a positioning key 30a having a substantially oval shape (see FIG. 8) is fixed by an adhesive. . That is, the positioning key 30a partially protrudes outward from the outer peripheral surface of the tool attachment portion 31d. Therefore, when the tool 30 having the tool body 32 is mounted on the needle bar chuck portion 12 described later, the upper end portion of the positioning key 30a is engaged with the key groove 12g (see FIG. 7) of the needle bar chuck portion 12. The phase of attachment of the tool 30 to the needle bar chuck portion 12 is adjusted.

Next, the needle bar chuck portion 12 provided at the lower end of the needle bar 7 will be described.
As shown in FIGS. 6 and 7, the needle bar chuck portion 12 includes a block-like chuck main body 12a screwed to the lower end portion of the needle bar 7, and three sets of ball lock mechanisms provided on the chuck main body 12a. 13 etc. A needle bar metal 7 b is attached to the lower end of the needle bar 7.

  As shown in FIG. 6, the chuck main body 12a is formed with three locking mechanism forming portions 12b radially every 120 ° on a horizontal plane, and a fixed shaft portion 12c extending upward from the central portion of the chuck main body 12a. Is formed. Therefore, the chuck body 12a is fixed to the lower end portion of the needle bar 7 by screwing the male screw formed in the fixed shaft portion 12c with the female screw of the fixing hole 7a formed in the lower end portion of the needle bar 7. Yes. Each of the three lock mechanism forming portions 12b is provided with a ball lock mechanism 13 to be described later.

  In the chuck body 12a, as shown in FIG. 7, for example, in order to mount the upper end portion of the tool holder 31 of the tool 30, an engagement hole 12d into which the engagement shaft portion 31a of the tool holder 31 is fitted, A first annular engagement surface 12e which is continuous with the lower end of the engagement hole 12d and can be engaged in close contact with the first annular tapered surface 31b, and a second annular tapered surface 31c which is continuous with the lower end of the first annular engagement surface 12e. And a second annular engagement surface 12f that can be engaged in close contact with each other.

  The engagement hole 12d is a substantially cylindrical hole formed downward, and the outer dimension of the lower end of the first annular engagement surface 12e continuous below the engagement hole 12d is larger than the outer dimension of the engagement hole 12d. The outer dimension of the lower end of the second annular engagement surface 12f continuous below the first annular engagement surface 12e is larger than the outer dimension of the lower end of the first annular engagement surface 12e. Here, as shown in FIG. 7, a substantially semicircular key groove 12g into which the upper end portion of the positioning key 30a is fitted is recessed in one side portion of the second annular engagement surface 12f.

  Next, the ball lock mechanism 13 provided in each of the three lock mechanism forming portions 12b will be described. However, since these three sets of ball lock mechanisms 13 have the same structure, the ball lock mechanism 13 provided in one of the lock mechanism forming portions 12b will be described.

  In the middle step in the height direction of the engagement hole 12d, a laterally tapered communication hole 12h toward the lock mechanism forming portion 12b is formed. A cylindrical hole 12i continuous with the tapered communication hole 12h is formed in the lock mechanism forming portion 12b in a lateral direction. A metal steel ball 13a is fitted into the tapered communication hole 12h, a circular seat 13b and a compression coil spring 13c are internally provided in the cylindrical hole 12i, and a spring holding screw 13d is screwed from the outside.

  In this case, the steel ball 13a in the tapered communication hole 12h is biased toward the engagement hole 12d via the circular seat 13b by the spring force of the compression coil spring 13c, so that a part of the steel ball 13a is engaged with the engagement hole 12d. Facing inside. Therefore, when the tool holder 31 of the tool 30 shown in FIG. 4 is mounted on the needle bar chuck portion 12 shown in FIG. 7 from the lower side, the steel ball 13a is moved when the engagement shaft portion 31a of the tool holder 31 passes. Although it temporarily moves outward against the spring force of the compression coil spring 13c, when it corresponds to the annular groove 31g, it returns to the original engagement position and presses the upper side of the annular groove 31g.

  At this time, as shown in FIG. 8, the engagement shaft portion 31a of the tool holder 31 is engaged with the engagement hole 12d, the first annular tapered surface 31b is engaged with the first annular engagement surface 12e, and the second The annular tapered surface 31c is engaged with the second annular engagement surface 12f. In this way, the tool 30 having the sewing needle as the tool body 32 is easily and reliably attached to the needle bar chuck portion 12 via the tool holder 31.

A tool 50 having a presser foot as a tool body 52 attached to the lower end will be described.
As shown in FIG. 12, the tool 50 includes a tool holder 51 and a presser foot detachably attached to the tool holder 51 as a tool body 52. The tool holder 51 includes an engaging shaft portion 51a at the upper end portion, a first annular tapered surface 51b that continues downward from the lower end of the engaging shaft portion 51a, and a first annular portion that continues downward from the lower end of the first annular tapered surface 51b. Two annular taper surfaces 51c, a tool attachment portion 51d that continues downward from the second annular taper surface 51c, an annular V groove 51e that continues downward from the tool attachment portion 51d, and an upper end portion of the tool body 52 that is a presser foot It has a mounting hole (not shown) for mounting, a positioning key (not shown), and the like.

  As shown in FIG. 6, the presser bar chuck portion 14 provided at the lower end of the presser bar 8 is configured in the same manner as the needle bar chuck unit 12 described above, and includes a block-shaped chuck main body 14a and a chuck main body 14a. It has three sets of ball lock mechanisms (not shown) provided. And although illustration is abbreviate | omitted inside the chuck | zipper main body 14a, the engagement hole, the 1st annular engagement surface, and the 2nd annular engagement surface are formed in order from the upper side.

  A presser bar metal 8 b is attached to the lower end of the presser bar 8. Therefore, when the tool 50 having the presser foot shown in FIG. 12 as the tool body 52 is mounted on the presser bar chuck portion 14, the engaging shaft portion 51a of the tool holder 51 is engaged with the engaging hole, and the first annular The tapered surface 51b is engaged with the first annular engagement surface, and the second annular tapered surface 51c is engaged with the second annular engagement surface.

  In this way, the tool 50 is easily and reliably attached to the presser bar chuck portion 14 via the tool holder 51. Here, the presser bar 8 is moved between a press position where the work cloth is pressed on the needle plate 3A (see FIG. 20) by the presser bar motor 152 (see FIG. 23) and a raised position which is higher than the press position. Can be moved. Therefore, the presser bar 8 is raised to the raised position by the presser bar motor 152 when changing the tool, and the presser bar 8 is lowered to the pressed position by the presser bar motor 152 when performing the sewing work.

  In addition to the tools 30 and 50 described above, a plurality of types of tools 35, 40, 45, 55, and 60 are prepared. As shown in FIG. 9, the tool 35 is held by a tool holder 36 using a drawing pen as a tool body 37. As shown in FIG. 10, the tool 40 is held by a tool holder 41 using a cutter as a tool body 42. As shown in FIG. 11, the tool 45 is held by a tool holder 46 using a grommet press as a tool body 47. As shown in FIG. 13, the tool 55 is held by a tool holder 56 using a cutter presser as a tool body 57.

  As shown in FIG. 14, the tool 60 is held by the tool holder 61 with the eyelet holder as a tool body 62. Here, the eyelet press which is the tool main body 47 is used to attach the eyelet which reinforces the round hole through which the string passes to the cloth by caulking. The cutter presser, which is the tool main body 57, is used to press the work cloth when the work cloth is cut by the cutter (tool main body 42). The eyelet holder which is the tool main body 62 is used for holding the eyelet and preventing the work cloth from being lifted.

  Each of these tools 30, 35, 40, 45, 50, 55, 60 having a sewing needle, drawing pen, cutter, eyelet press, presser foot, cutter presser, eyelet holder is a tool holder 31, 36, 41, 46, 51, 56, and 61, respectively.

  Therefore, each of the tool holders 31, 36, 41, 46, 51, 56, 61 includes an engagement shaft portion 31a, 36a, 41a, 46a, 51a, 56a, 61a and a first annular tapered surface 31b, 36b. , 41b, 46b, 51b, 56b, 61b and second annular tapered surfaces 31c, 36c, 41c, 46c, 51c, 56c, 61c are formed respectively. These tools 30, 35, 40, 45 are mounted on the needle bar chuck unit 12, and these tools 50, 55, 60 are mounted on the presser bar chuck unit 14.

  In particular, the holder center line HC of the tool holders 41, 46, 51, 56, and 61 in the tools 40, 45, 50, 55, and 60 and the tool center line KC of the tool bodies 42, 47, 52, 57, and 62 are as follows. Each has shifted. When these tools 40 and 45 are used while being mounted on the needle bar chuck portion 12, a large bending moment acts on the needle bar chuck portion 12. When these tools 50, 55, 60 are mounted on the presser bar chuck unit 14 and used, a large bending moment acts on the presser bar chuck unit 14.

Next, the first tool magazine 16 in which the above-described plural types of tools 30, 35, 40, 45 to be mounted on the needle bar chuck portion 12 will be described.
As shown in FIGS. 1, 2, 15, and 16, the first tool magazine 16 is provided on a mounting plate 65, and a first tool magazine 16 on which a plurality of types of tools 30, 35, 40, and 45 are mounted. One magazine portion 16A and a first rotation drive mechanism 16B that rotates the first magazine portion 16A are provided. First, the first magazine portion 16A will be described.

  The first magazine portion 16A includes a mounting disc 67, eight magazine chucks 68, a rotation shaft 69, and the like. The mounting disc 67 is made of a metal disc having a predetermined thickness. In the vicinity of the outer periphery of the mounting disc 67, eight mounting portions are provided at predetermined intervals, and a magazine chuck 68 is fixed to each of the mounting portions by a fixing screw.

  These magazine chucks 68 are configured in the same manner as the chuck mechanism (engagement hole 12d, first and second annular engagement surfaces 12e and 12f, ball lock mechanism 13) provided in the needle bar chuck portion 12 described above. Therefore, the plurality of types of tools 30, 35, 40, 45 described above can be mounted on the magazine chuck 68 and stored.

  A cylindrical outer cylinder 71 is erected on the upper side of the mounting plate 65, and the first collar 72 is rotatably supported from above on a locking collar 71 a formed in the middle step inside the outer cylinder 71. . The upper end portion of the vertical rotation shaft 69 is fixed to the lower side of the central portion of the mounting disc 67. The mounting disc 67 is rotatably supported by the first collar 72 via a ring member 73 provided below the central portion.

  A disk plate 75 made of a transparent thin plate is fixed to the lower end portion of the rotating shaft 69 via a second collar 76 fixed to the rotating shaft 69. Therefore, a plurality of fine lines formed radially on the surface of the disk plate 75 are detected by the first position detection sensor 77 (see FIG. 23), so that the position output from the first position detection sensor 77 by the control device 145 is detected. Based on the detection signal, the rotation position of the mounting disc 67 by 45 ° can be detected.

  Next, the first rotation drive mechanism 16B includes a first magazine motor 80, a worm gear 81 connected to the first magazine motor 80, a worm wheel 82 that meshes with the worm gear 81, and the like. The first magazine motor 80 is a stepping motor, and is fixed forwardly on the mounting plate 65 in a horizontal posture via an L-shaped mounting plate 84. A worm gear 81 is connected to the drive shaft of the first magazine motor 80 via a coupling 85, and the worm gear 81 is rotatably supported by a clog-like support member 86. On the other hand, a worm wheel 82 is fixed to the lower half portion of the rotating shaft 69 and meshes with the worm gear 81.

  Therefore, when the first magazine motor 80 is driven to rotate, the worm gear 81 is rotated via the coupling 85 and the worm wheel 82 meshing with the worm gear 81 is rotated. Therefore, the rotating shaft 69 fixed to the worm wheel 82 is rotated. And the mounting disc 67 rotates about the vertical axis. At this time, every time the mounting disk 67 rotates 45 °, the rotational position of the mounting disk 67 is detected based on the position detection signal output from the first position detection sensor 77.

  Next, the second tool magazine 18 that houses the above-described plural types of tools 50, 55, 50 to be mounted on the presser bar chuck portion 14 will be described with reference to FIGS. The second tool magazine 18 includes a second magazine portion 18A for mounting a plurality of types of tools 50, 55, 60, and a second rotation driving portion 18B for rotating the second magazine portion 18A by a second magazine motor 88. Since it is configured similarly to the first tool magazine 16 described above, detailed description thereof is omitted.

Next, the first tool changer 20 for exchanging the tools 30, 35, 40, 45 of the needle bar chuck portion 12 and the tools 30, 35, 40, 45 of the first tool magazine 16 will be described.
As shown in FIGS. 1, 3, 17, and 18, a right support frame 93 that is substantially U-shaped in a side view is disposed close to the right side surface of the arm portion 5, and is passed to the upper side of the arm portion 5. It is supported by a support plate 11 that is long in the left-right direction and a face plate 5A on the front surface of the arm portion 5.

  The first tool changer 20 is provided in the right support frame 93, a linear first change arm 20 </ b> A supported on the right support frame 93 so as to be rotatable and vertically movable, and the right support frame 93. A first vertical drive mechanism 20B that moves the first exchange arm 20A up and down, and a first rotary drive mechanism 20C that is provided in the right support frame 93 and rotates the first exchange arm 20A around the vertical axis.

  As shown in FIGS. 1, 2, and 17 to 19, the first replacement arm 20 </ b> A is linear in plan view, and has a central arm main body 95 and the arm main body 95 at the center. The first gripping member 96, the second gripping member 97, and the like fixed in the length direction so as to be point-symmetric with respect to the shaft, a rotation shaft extending in the vertical direction, which will be described later, at the center of the arm main body 95. The lower end of 107 is fixed.

  The first grip member 96 is formed with a first grip portion 96a having a convex portion at the tip and a support portion 96b in the middle in the length direction. The grip shaft 98 in equilibrium with the first grip member 96 is supported by inserting the support portion 96 b and partially fitting the rear end portion into the arm main body portion 95. A gripping roller 99 such as an abacus bead is supported at the tip of the gripping shaft 98 so as to be rotatable around the vertical direction. Further, a gripping spring 100 made of a compression coil spring is interposed between the support portion 96 b and the arm main body portion 95. Therefore, the grip shaft 98 is always elastically biased toward the tip end side.

  Here, as will be described later, when the above-described tools 30, 35, 40, 45 are gripped by the first gripping portion 96a, the annular V grooves 31e, 35e, 41e, 46e of the tool holders 31, 35, 41, 46 are formed. In contact with the gripping roller 99, the first gripping portion 96 a has a tip portion of the first gripping portion 96 a so that the tools 30, 35, 40, 45 can be held horizontally and in a stable posture. An engagement pin (not shown) protruding inside is provided.

  The second gripping member 97 is configured in the same manner as the first gripping member 96. A gripping shaft 98 having a gripping roller 99 at the front end portion is supported by inserting the support portion 97 b and partially inserting the rear end portion into the arm main body portion 95, and between the support portion 97 b and the arm main body portion 95. The spring force of the gripping spring 100 interposed therebetween is always elastically biased toward the tip end side. An engagement pin 101 is provided on the second grip 97b.

  Therefore, in FIG. 19, when the first exchange arm 20A is rotated counterclockwise in a plan view by a first rotation drive mechanism 20C described later, any one of the tools 30, 35, 40, 45 is held in the first grip. One of the tools 30, 35, 40, 45 is gripped by the second gripping portion 97 a of the second gripping member 97 while being gripped by the first gripping portion 96 a of the member 96.

  Next, the first vertical drive mechanism 20B that moves the first replacement arm 20A up and down will be described. The first vertical drive mechanism 20B includes a first vertical motion air cylinder 105, a ball spline mechanism 106, a rotating shaft 107, a cover body 108, and the like. The first vertically moving air cylinder 105 is a backward moving type and is fixed downward on the upper surface of the right support frame 93.

  The ball spline mechanism 106 will be described. A vertically extending spline shaft 111 is disposed immediately below the piston rod 105 a extending downward from the first vertically moving air cylinder 105, and an outer cylinder 113 is disposed immediately outside the spline shaft 111. On the other hand, a cylindrical cover body 108 is disposed so as to enclose the spline shaft 111, and is supported by the right support frame 93 at the upper end portion. A rotating shaft 107 is disposed below the spline shaft 111, and a lower end portion of the spline shaft 111 and an upper end portion of the rotating shaft 107 are integrally connected by a coupling 112.

  Accordingly, the outer cylinder 113 is supported by the cover body 108 so as to be movable up and down and rotatable via a deep groove ball bearing 114 disposed on the outer side. The rotating shaft 107 is supported by the cover body 108 via a lower thrust bearing 115 so as to be movable up and down and rotatable. That is, a large number of steel balls (not shown) disposed between the outer cylinder 113 and the spline shaft 111 have a plurality of spline grooves (not shown) formed vertically on the outer peripheral surface of the spline shaft 111. The outer cylinder 113 is configured to act as a linear motion guide device that moves infinitely linearly on the spline shaft 111 so as to roll up and down.

  Screws are respectively formed at the upper end and the lower end of the connecting rod 110 arranged in the vertical direction, and the upper end of the connecting rod 110 is screwed to the piston rod 105a of the first vertically moving air cylinder 105. A lower end portion of 110 is rotatably connected to an upper end portion of the spline shaft 111. Furthermore, the lower end portion of the rotating shaft 107 is connected to the central portion of the first exchange arm 20A. Accordingly, when the first vertically moving air cylinder 105 is driven to advance and retract, the piston rod 105a moves downward or upward, so that the connecting rod 110 and the ball spline mechanism 106 (spline shaft 111 and outer cylinder 113). Then, the first replacement arm 20A moves up and down over a predetermined stroke via the rotating shaft 107.

Next, the first rotation drive mechanism 20C that rotates the first exchange arm 20A around the vertical axis will be described.
The first rotation drive mechanism 20C includes a first rotation motor 120, a drive gear 121 and a driven gear 122, the above-described ball spline mechanism 106, a rotation shaft 107, a cover body 108, and the like.

  The first rotation motor 120 is a stepping motor and is supported by the right support frame 93. A small-diameter drive gear 121 is fixed to the drive shaft of the first rotation motor 120. The driven gear 122 has a substantially donut shape, is connected to the outer cylinder 113 by a fixing screw 123, and meshes with the drive gear 121. Therefore, when the first rotation motor 120 is driven to rotate in an arbitrary direction, the drive gear 121 and the driven gear 122 rotate integrally, and the outer cylinder 113 connected to the driven gear 122 rotates, so that the ball spline mechanism The first exchange arm 20 </ b> A rotates through a predetermined angle through 106 (the outer cylinder 113 and the spline shaft 111) and the rotation shaft 107.

  Small and metallic position detecting pieces 124 are fixed at predetermined angles at a plurality of locations on the outer peripheral portion of the upper surface of the driven gear 122. Therefore, since the second position detection sensor 125 (see FIG. 23) outputs a position detection signal every time the position detection piece 124 is detected, the control device 145 outputs a position detection signal output from the second position detection sensor 125. Based on the above, the rotational position of the first exchange arm 20A can be detected.

  Next, the second tool changer 22 for exchanging the tools 50, 55, 60 of the presser bar chuck portion 14 and the tools 50, 55, 60 of the second tool magazine 18 will be described. However, the second tool changer 22 includes a left side support frame 128 supported by the support plate 11 and the face plate 5A, and a linear second changer supported by the left side support frame 128 so as to be rotatable and vertically movable. An arm 22A, a second vertical drive mechanism (not shown) provided in the left support frame 128 to move the second exchange arm 22A up and down, and a second exchange arm 22A provided in the left support frame 128 around the vertical axis. And a second rotation drive mechanism (not shown) that rotates the same as the first tool changer 20 described above.

  That is, since the second vertical drive air cylinder 130 (see FIG. 23) is provided in the second vertical drive mechanism, the second exchange arm 22A is moved up and down by the second vertical motion air cylinder 130. Further, since the second rotation driving mechanism 132 is provided with the second rotation motor 132 (see FIG. 23), the second exchange arm 22A is rotated around the vertical axis by the second rotation motor 132.

Next, the lock mechanism 26 that locks the rotation of the sewing machine main shaft 24 in order to hold the needle bar 7 in the uppermost position will be described.
As shown in FIG. 20, the lock mechanism 26 includes a lock disk plate 135 provided on the sewing machine main shaft 24, a drive lever 137 that engages a lock pin 136 with an engagement hole 135 a of the lock disk plate 135, and A guide shaft 138, a lock solenoid 139, and the like are included. As shown in FIGS. 20 and 21, the locking disk plate 135 is circular and is fixed to the vicinity of the rear end of the sewing machine main shaft 24.

  A left and right drive lever 137 is disposed immediately in front of the locking disk plate 135, and is fixed to a front and rear direction guide shaft 138 in the vicinity of the left end. The guide shaft 138 is supported by a support member (not shown) so as to be reciprocally movable in the front-rear direction. A lock pin 136 is fixed to the right end of the drive lever 137 in the rearward direction, and the locking disk plate 135 is formed with a tapered engagement hole 135a into which the lock pin 136 can be inserted, as shown in FIG. ing.

  The drive lever 137, together with the guide shaft 138, is a front non-engagement position (shown by a solid line in FIG. 21) where the lock pin 136 is disengaged from the engagement hole 135a, and a predetermined distance from the non-engagement position. 136 is slidable over a rear engagement position (illustrated by a solid line in FIG. 20) in which the engagement hole 136a engages with the engagement hole 135a. The drive lever 137 is always located at the front non-engagement position by the spring force of the compression coil spring 140 mounted on the guide shaft 138.

  On the front side of the left end portion of the drive lever 137, a rotating plate 141 that can be rotated in a horizontal plane by a vertical support screw is disposed, and the lock solenoid 139 can rotate the rotating plate 141 by this plunger, that is, in plan view. Can be rotated counterclockwise. When the lock solenoid 139 is not energized, the guide shaft 138 and the drive lever 137 stand by at the front disengagement position (see FIG. 21) by the spring force of the compression coil spring 140.

  When the lock solenoid 139 is energized during the tool change, the rotation plate 141 rotates counterclockwise and pushes the drive lever 137 backward, so that the drive lever 137 is compressed while being guided by the guide shaft 138. The coil spring 140 moves to the engagement position (see FIG. 20) against the spring force. At this time, since the engagement hole 135a is tapered, the lock pin 136 is easily and reliably engaged with the engagement hole 135a via the taper, and the rotation of the sewing machine main shaft 24 is locked at its uppermost position.

Next, a control system of the pattern sewing machine 1 will be described.
As shown in FIG. 23, the control device 145 includes a computer including a CPU 146, a ROM 147, a RAM 148, and the like. The control device 145 includes a start / stop switch 150, a spindle phase angle sensor 151 that detects the rotation angle of the sewing machine spindle 24, a first position detection sensor 77, a second position detection sensor 125, and a sewing machine motor 25. Drive circuit 155, drive circuit 156 for presser bar motor 152, drive circuits 157 and 158 for X and Y direction drive motors 10a and 10b, and first and second magazine motors 80 and 88. Drive circuits 159, 160, drive circuits 161, 162 for the first and second rotating motors 120, 132, drive circuits 163, 164 for the first and second vertically moving air cylinders 105, 130, The drive circuit 165 for the lock solenoid 139 is connected to each other.

  The ROM 147 stores not only various pattern sewing data but also various sewing data such as cutting data for cutting the work cloth along the cutting line and attachment position data for attaching the eyelet. The ROM 147 further includes a sewing tool change program for mounting the tools 30, 35, 40, and 45 on the needle bar chuck unit 12 and mounting the tools 50, 55, and 60 on the presser bar chuck unit 14 and a work cloth. A plurality of types of tool change programs such as a cutting tool change program for attaching the cutter tool 40 to the needle bar chuck portion 12 and attaching the cutter presser tool 55 to the presser bar chuck portion 14 are stored in advance. ing.

  Each of the plurality of tool change programs includes a magazine drive control for driving the first and second magazine motors 80 and 88 and rotating the first and second tool magazines 16 and 18 individually, The second rotation motors 120 and 132 are respectively driven to rotate the first and second exchange arms 20A and 22A individually, and the first and second vertically moving air cylinders 105 and 130 are respectively driven to be first. In addition, exchange drive control for individually driving the second exchange arms 20A and 22A up and down is stored in advance as a set.

Next, the sewing operation of the pattern sewing machine 1 configured as described above will be described.
When various sewing operations are performed by the pattern sewing machine 1, a plurality of types of tools 30, 35, 40, and 45 are mounted in advance on the eight magazine chucks 68 provided in the first tool magazine 16. A plurality of types of tools 50, 55, 60 are mounted in advance on the eight magazine chucks 68 provided in the second tool magazine 18. At this time, it is assumed that the tool 30 is attached to the needle bar chuck portion 12 and the tool 50 is attached to the presser bar chuck portion 14.

  When the tool 30 having the sewing needle as the tool body 32 is mounted on the needle bar chuck portion 12, as described above, the engagement shaft portion 31a of the tool holder 31 engages with the engagement hole 12d, and the first annular shape. The needle bar 7 is driven up and down with the tapered surface 31b engaged with the first annular engagement surface 12e and the second annular tapered surface 31c engaged with the second annular engagement surface 12f. In this case, the first inclined angle formed by the first annular tapered surface 31b and the horizontal plane of the first annular engagement surface 12e is about 45 °, respectively, and the horizontal plane of the second annular tapered surface 31c and the second annular engagement surface 12f. The second inclination angles formed by the above are respectively about 70 °.

  That is, even when a large upward load generated when the sewing needle descends during sewing is applied to the tool holder 31, this large load is reliably detected by the first annular engagement surface 12e having a first inclination angle of about 45 °. Can take it. In addition, by receiving this large load with the second annular engagement surface 12f having the second inclination angle larger than the first inclination angle, the tool holder 31 bites into the needle bar chuck portion 12 due to the wedge action. Hexadecimal input works. Therefore, the tool holder 31 can be securely and firmly attached to the needle bar chuck portion 12 by eliminating the rattling.

  In particular, when a tool 40 having a cutter as a tool body 42 is attached to the needle bar chuck portion 12, the holder center line HC of the tool holder 41 and the tool center line KC of the tool body 42 are shifted. Therefore, a large bending moment acts on the needle bar chuck portion 12. However, as described above, this bending moment can be reliably received and eliminated by the needle bar chuck portion 12 by the occurrence of advance input that bites by the wedge action of the second annular tapered surface 31c.

  As described above, when the tool 30 is mounted on the needle bar chuck portion 12, the tool holder 31 can be reliably received by the combination of the two annular engagement surfaces by the first and second annular engagement surfaces 12e and 12f. That is, the load in the axial direction of the needle bar 7 can be reliably received by the first annular engagement surface 12e, and the load due to the bending moment can be reliably received by the second annular engagement surface 12f.

  Further, by appropriately combining the sizes of the two first and second annular engagement surfaces 12e and 12f, the width direction dimension and the vertical direction dimension of the needle bar chuck portion 12 are ideally shortened. The part 12 can be made compact. Moreover, since the biting force of the tool holder 31 against the needle bar chuck portion 12 in the state where the tool 30 is mounted on the needle bar chuck portion 12 is not large, the tool holder 31 is excessively engaged with the needle bar chuck portion 12. This can be reliably prevented, and the first replacement arm 20A can easily pull the tool holder 31 downward from the needle bar chuck portion 12.

  Accordingly, FIGS. 24 to 29 show an exchange operation for exchanging the tool 30 already mounted on the needle bar chuck portion 12 and the tool 35 stored in the first tool magazine 16 by the first exchange arm 20A. This will be explained based on.

  First, as shown in FIGS. 1, 24-1 and 24-2, the first replacement arm 20 </ b> A waits at the standby position so that it does not interfere with the tools 30, 35, 40, 45 of the first tool magazine 16. Yes. At this time, the first replacement arm 20 </ b> A is lifted to the upper position by the retraction drive of the first vertically moving air cylinder 105. Further, the lock solenoid 139 is driven, and the guide shaft 138 and the drive lever 137 move to the engagement position (see FIG. 20) as described above, and the lock pin 136 enters the engagement hole 135a of the lock disk plate 135. Because of the engagement, the rotation of the sewing machine main shaft 24 is locked at its uppermost position.

  From this state, the first magazine motor 80 is driven, and the mounting disk 67 is rotated so that the tool 35 is located at a predetermined replacement position. Next, as shown in FIGS. 25A and 25B, the first replacement arm 20 </ b> A rotates counterclockwise by about 135 ° by driving the first rotation motor 120, and the first tool magazine 16. The tool 35 positioned at the replacement position is gripped by the first gripping portion 96a of the first replacement arm 20A, and at the same time, the tool 30 of the needle bar chuck portion 12 is gripped by the second gripping portion 97a.

  At this time, the gripping shaft 98 is temporarily retracted inside against the spring force of the gripping spring 100, but immediately returns to the original position, and the tool 35 is securely gripped by the gripping roller 99 at the first gripping portion 96a. Then, the tool 30 is reliably gripped by the gripping roller 99 at the second gripping portion 97a.

  Thereafter, as shown in FIGS. 26A and 26B, since the first vertically moving air cylinder 105 is driven forward, the first replacement arm 20A is lowered to the lower position. At this time, the tool 35 of the first tool magazine 16 was pulled out from the magazine chuck 68 through the ball lock mechanism while being gripped by the first gripping portion 96a, and the tool 30 was gripped by the second gripping portion 97a. In this state, the needle bar chuck unit 12 is pulled out via the ball lock mechanism 13.

  Next, as shown in FIGS. 27-1 and 27-2, the first replacement arm 20A is rotated counterclockwise by about 180 ° by the drive of the first rotating motor 120, and the first The tool 35 of the grip part 96a moves to the lower side of the needle bar chuck part 12, and the tool 30 of the second grip part 97a moves to the lower side of the replacement position where the tool 35 of the first tool magazine 16 was mounted. .

  Next, as shown in FIGS. 28A and 28B, the first vertically moving air cylinder 105 is driven to retract, and the first replacement arm 20A is raised to the upper position. At this time, the tool 35 is attached to the needle bar chuck portion 12 from below while being held by the first holding portion 96a of the first exchange arm 20A, and the tool 30 is held by the second holding portion 97a. Thus, the first tool magazine 16 is mounted on the magazine chuck 68 at the replacement position from below.

  At the time of mounting, the upper end portion of a positioning key (not shown) provided in the tool main body 36 is engaged with the key groove 12g of the needle bar chuck portion 12, and the mounting phase of the tool 35 with respect to the needle bar chuck portion 12 is matched. In addition, the rotation of the needle bar chuck portion 12 during use of the tool holder 36 is restricted.

  At this time, the engagement shaft portion 36a of the tool holder 36 of the tool 35 is engaged with the engagement hole 12d, the first annular tapered surface 36b is engaged with the first annular engagement surface 12e, and the second annular tapered surface 36c. Is engaged with the second annular engagement surface 12f. Moreover, the steel ball 13a of the ball lock mechanism 13 presses the upper portion of the annular groove 36g by the spring force of the compression coil spring 13c. Therefore, the tool 35 is always attached to the needle bar chuck portion 12 in a pressed state by the spring force of the compression coil spring 13c.

  Thereafter, the energization to the lock solenoid 139 is stopped, and the guide shaft 138 and the drive lever 137 are moved to the non-engagement position (see FIG. 21) by the spring force of the compression coil spring 13c, so that the lock at the uppermost position of the sewing machine main shaft 24 is locked. Canceled. Finally, as shown in FIGS. 29A and 29B, by driving the first rotation motor 120, the first replacement arm 20A is rotated to a standby position that does not interfere with sewing.

  On the other hand, when the tool 50 mounted on the presser bar chuck portion 14 and one of the tools 55 and 60 stored in the second tool magazine 18 are replaced by the second replacement arm 22A of the second tool changer 22. As described above, the tool 30 mounted on the needle bar chuck portion 12 and any of the tools 35, 40, and 45 stored in the first tool magazine 16 are replaced with those of the first tool changer 20. The exchange is performed in the same manner as the exchange by the first exchange arm 20A. Therefore, the description of the replacement operation is omitted.

  However, when the tool 50 mounted on the presser bar chuck portion 14 is replaced by the first tool changer 20, the presser bar motor 152 is driven and the presser bar 8 is raised to the raised position. Done. When sewing is started, the presser bar 8 is lowered to the press position by driving the presser bar motor 152, and the work cloth is pressed onto the needle plate 3A.

  Thus, when the tool 50 having the presser foot on the tool main body 52 and the tool 55 having the cutter presser on the tool main body 57 are mounted on the presser bar chuck portion 14, these tools 50, 55,. -The backlash can be reliably removed and firmly attached to the presser bar chuck portion 14.

  Even when a large bending moment is applied to the presser bar chuck part 14, the presser bar chuck part 14 can reliably receive and eliminate it due to the occurrence of advancing input by the wedge action of the second annular tapered surfaces 51c and 56c. it can.

  Furthermore, by appropriately combining the sizes of the two first and second annular engagement surfaces of the presser bar chuck part 14, the width direction dimension and the vertical direction dimension of the presser bar chuck part 14 are ideally shortened. The presser bar chuck portion 14 can be made compact. Moreover, since the biting force of the tool holder 51 against the presser bar chuck part 14 is not large when the tool 50 is mounted on the presser bar chuck part 14, the tool holder 51 is excessively engaged with the presser bar chuck part 14. This can be reliably prevented, and the tool 50 can be easily pulled downward by the second exchange arm 22A.

  In this way, the needle bar chuck part 12 and the presser bar chuck part 14 are provided at the lower ends of the needle bar 7 and the presser bar 8, and are attachable to and detachable from the chuck parts 12 and 14, respectively. A plurality of kinds of tools 30, 35, 40, 45, 50, 55, 60 having 46, 51, 56, 61 are provided, and the tool holders 31, 36, 41, 46, 51, 56, 61 are engaged with the upper end portion. Shaft portions 31a, 36a, 41a, 46a, 51a, 56a, 61a and first annular tapered surfaces 31b, 36b, 41b, 46b, 51b, 56b, 61b and second annular tapered surfaces 31c, 36c, 41c, 46c, 51c, 56c, 61c, and the chuck portions 12, 14 have an engagement hole 12d, a first annular engagement surface 12e, and a second annular engagement surface 12f, so that the tool holders 31, 36, 41, 46, 51 , 5 , 61 are attached to the chuck portions 12, 14, the engaging shaft portions 31a, 36a, 41a, 46a, 51a, 56a, 61a of the tool holders 31, 36, 41, 46, 51, 56, 61 and the first annular taper. The surfaces 31b, 36b, 41b, 46b, 51b, 56b, 61b and the second annular tapered surfaces 31c, 36c, 41c, 46c, 51c, 56c, 61c are respectively connected to the engagement holes 12d of the chuck portions 12, 14 and the first holes. The first annular engagement surface 12e and the second annular engagement surface 12f are engaged.

  The second inclined angle formed by the horizontal surface of the second annular engagement surface 12f with which the second annular tapered surfaces 31c, 36c, 41c, 46c, 51c, 56c, 61c engage is the first annular tapered surfaces 31b, 36b, 41b. , 46b, 51b, 56b, and 61b are larger than the first inclination angle formed by the horizontal surface of the first annular engagement surface 12e with which the tool holders 31, 36, 41, and 46 are mounted. , 51, 56, 61 even when a large load is applied, the large load can be reliably received by the first annular engagement surface 12e having the first inclination angle. Moreover, the tool holders 31, 36, 41, 46, 51, 56, 61 receive the large load by the second annular engagement surface 12f having the second inclination angle larger than the first inclination angle. An advance input that bites into the chuck portions 12 and 14 acts by the wedge action. Therefore, the tool holders 31, 36, 41, 46, 51, 56, 61 can be securely and firmly attached to the chuck portions 12, 14 by reliably eliminating rattling.

  Furthermore, by appropriately combining the sizes of the two first and second annular engagement surfaces 12e and 12f on the chuck portions 12 and 14 side, the width and vertical dimensions of the chuck portions 12 and 14 are ideal. The chuck portions 12 and 14 can be made compact. Moreover, the chuck portions of the tool holders 31, 36, 41, 46, 51, 56, 61 in a state where the tool holders 31, 36, 41, 46, 51, 56, 61 are mounted on the chuck portions 12, 14. Since the biting force with respect to 12 and 14 is not large, the tool holders 31, 36, 41, 46, 51, 56 and 61 can be reliably prevented from excessively engaging the chuck portions 12 and 14. 31, 36, 41, 46, 51, 56, 61 can be easily pulled out from the chuck portions 12, 14.

Next, a case where the tool holder is mounted on a spindle provided in a machine tool that is a processing apparatus will be described.
As shown in FIG. 30, a machine tool 170 includes a column (not shown) erected on a base (not shown), and a frame 171 composed of a box-shaped hollow casing horizontally disposed and fixed on the front surface of the column. , A spindle head 172 disposed on the frame 171, a spindle 173 rotatably supported by the spindle head 172, and a tool clamping mechanism 180 for clamping or unclamping a tool holder 185 mounted on the spindle 173. Etc.

  A column is fixed upright with respect to the base of the machine tool 170, and a ball screw extending in the vertical axis direction is provided on the front surface of the column, and is rotated clockwise or counterclockwise by an AC servo motor (not shown). It is designed to rotate around. When the ball screw is rotated by the AC servo motor, the frame 171 and the spindle head 172 are movable up and down via nuts (not shown) that are screwed onto the ball screw.

  A hollow cylindrical main shaft 173 is supported in front of the main shaft head 172 via a plurality of bearings 174 so as to be rotatable about a vertical axis. The main shaft 173 is connected to a main shaft motor 176 disposed upright on the top of the main shaft head 172 via a coupling 175 provided at the upper end. The main shaft 173 rotates by driving the main shaft motor 176.

Next, since the tool clamp mechanism 180 is well known, it will be briefly described.
A draw bar 181 is disposed inside the main shaft 173 and is urged to an upper holding position by a tension coil spring 182. The draw bar 181 is connected to the lower end of the swing lever 183 in the middle in the height direction. When the swing lever 183 is swung clockwise in the drawing by a swing mechanism (not shown), the draw bar 181 is lowered from the uppermost holding position to the lower release position. At this time, since the holding claw 181a (see FIG. 33) at the tip of the draw bar 181 is opened, the held state of the held tool holder 185 is released and can be removed downward.

Next, the tool holder 185 will be described.
As shown in FIG. 32, the tool holder 185 includes a pull stud 186 (engagement shaft portion) at the upper end portion with which the holding claw 181a is engaged, and a first annular tapered surface 185a continuous downward from the lower end of the pull stud 186. A second annular tapered surface 185b extending downward from the lower end of the first annular tapered surface 185a, a lower flange portion 187 of the second annular tapered surface 185b, and a chuck 188 below the flange portion 187. Have.

  Various cutting tools (for example, a drill) 189 are detachably attached to the flange portion 187 via a chuck 188. The flange portion 187 is formed with an annular V groove 187a having a substantially V-shaped cross section, and the tool holder 185 is held by the arm of an automatic tool changer (not shown) through the annular V groove 187a. ing.

Next, the chuck portion 191 at the lower end of the main shaft 173 will be described.
As shown in FIG. 31, the chuck portion 191 has a lower end portion of the draw bar 181, an engagement hole 173 a into which the pull stud 186 of the tool holder 185 is fitted, and a lower end of the engagement hole 173 a. A first annular engagement surface 173b engageable with the first annular tapered surface 185a, and a second annular engagement surface 173c continuous with the lower end of the first annular engagement surface 173b and engageable with the second annular tapered surface 185b; Have

  When the workpiece is processed, as shown in FIG. 33, the tool holder 185 is attached to the chuck portion 191 of the main shaft 173 by pulling the pull stud 186 by the holding claw 181 a by the upward pulling action of the draw bar 181. That is, the pull stud 186 of the tool holder 1853 is engaged with the engagement hole 173a, the first annular tapered surface 185a is engaged with the first annular engagement surface 173b, and the second annular tapered surface 185b is engaged with the second annular engagement. The workpiece is machined while engaged with the mating surface 173c.

  In this case, the first inclination angle formed between the first annular tapered surface 185a and the horizontal plane of the first annular engagement surface 173b is about 45 °, respectively, and the horizontal plane of the second annular tapered surface 185b and the second annular engagement surface 173c. The second inclination angles formed by the above are respectively about 70 °. That is, even when a large load generated upward is applied to the tool holder 185 during processing, the large load can be reliably received by the first annular engagement surface 173b having a first inclination angle of about 45 °. .

  In addition, by receiving this large load at the second annular engagement surface 173c having a second inclination angle larger than the first inclination angle, the tool holder 185 is advanced to bite into the chuck portion 191 due to the wedge action. Works. Therefore, the tool holder 185 can be securely and firmly attached to the chuck portion 191 with the backlash reliably eliminated.

Next, a modified embodiment in which the above embodiment is partially modified will be described.
1) The first inclined angles formed by the first annular tapered surfaces 31b and 185a and the horizontal surfaces of the first annular engaging surfaces 12e and 173b are arbitrary angles other than about 45 °, respectively, and the second annular tapered surfaces 31c and 185b And the second inclined angle formed by the horizontal surfaces of the second annular engagement surfaces 12f and 173c may be any angle other than about 70 °.

2) Although the pattern sewing machine has been described in the present embodiment, the present invention can be applied to various sewing machines such as a main sewing machine and various processing apparatuses.

It is a perspective view of the pattern sewing machine which concerns on the Example of this invention. It is a front view of the pattern sewing machine which concerns on the Example of this invention. It is a side view of the pattern sewing machine which concerns on the Example of this invention. It is a perspective view of the tool which has a sewing needle. It is a longitudinal cross-sectional view of the tool which has a sewing needle. It is a perspective view of a needle bar and a presser bar each having a chuck part at the lower end part. It is a principal part longitudinal cross-sectional view of a needle bar chuck | zipper part. It is a principal part longitudinal cross-sectional view of the tool which has a needle bar chuck | zipper part and a sewing needle. It is a perspective view of the tool which has a drawing pen. It is a perspective view of the tool which has a cutter. It is a perspective view of the tool which has an eyelet press. It is a perspective view of the tool which has a presser foot. It is a perspective view of the tool which has a cutter holder. It is a perspective view of the tool which has an eyelet holder. It is a top view of the 1st tool magazine. It is a principal part vertical side view of a 1st tool magazine. It is a perspective view of a 1st tool change apparatus. It is a principal part vertical side view of a 1st tool change apparatus. It is a perspective view of the 1st exchange arm. It is a perspective view which shows the internal structure of the arm part of a pattern sewing machine. It is explanatory drawing explaining the principal part of a locking mechanism. It is a principal part vertical side view of a sewing machine main shaft and the disk plate for a lock | rock. It is a block diagram of a control system of a pattern sewing machine. It is a top view of the 1st exchange arm of a standby state, a needle bar chuck | zipper part, and a 1st tool magazine. It is a front view of the 1st exchange arm of a standby state, a needle bar chuck part, and the 1st tool magazine. FIG. 24 is a view corresponding to FIG. 23-1 including the first exchange arm in the tool gripping state. FIG. 24 is a view corresponding to FIG. 23-2 including the first exchange arm in a tool gripping state. FIG. 25 is a view corresponding to FIG. 24-1 including the first exchange arm lowered in the tool gripping state. FIG. 25 is a view corresponding to FIG. 24-2 including the first replacement arm lowered in the tool gripping state. FIG. 25 is a view corresponding to FIG. 24-1 including a first exchange arm rotated in a tool gripping state. FIG. 25 is a view corresponding to FIG. 24-2 including the first exchange arm rotated in the tool gripping state. FIG. 25 is a view corresponding to FIG. 24-1 including the first exchange arm raised in the tool gripping state. FIG. 25 is a view corresponding to FIG. 24-2 including the first exchange arm raised in the tool gripping state. FIG. 25 is a view corresponding to FIG. 24-1 including the first exchange arm in a standby state. FIG. 25 is a view corresponding to FIG. 24-2 including the second exchange arm in a standby state. It is a principal part vertical front view of a machine tool. It is the elements on larger scale of a main axis. It is a front view of a tool holder. It is a principal part enlarged view of the main axis | shaft which equipped with the tool holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pattern sewing machine 7 Needle bar 8 Presser bar 12 Needle bar chuck part 12d Engagement hole 12e First annular engagement surface 12f Second annular engagement surface 13 Ball lock mechanism 13a Steel ball 14 Presser bar chuck part 24 Sewing spindle 25 Sewing machine Motor 30 Tool (sewing needle)
30a Positioning key 31 Tool holder 31a Engagement shaft portion 31b First annular tapered surface 31c Second annular tapered surface 31g Annular groove 35 Tool (drawing pen)
40 Tools (cutter)
45 Tools (Hatume Press)
50 tools (presser foot)
55 Tool (cutter presser)
60 tools (eyelet holder)
170 Machine tools (processing equipment)
173 Main shaft 173a Engagement hole 173b First annular engagement surface 173c Second annular engagement surface 185 Tool holder 185a First annular taper surface 185b Second annular taper surface 186 Pull stud (engagement shaft portion)
191 Chuck part

Claims (6)

In a tool holder that is detachably attached to a chuck portion of a spindle provided in a processing apparatus by attaching a tool,
An engagement shaft at the upper end,
A first annular tapered surface continuous downward from the lower end of the engagement shaft portion;
A second annular tapered surface continuous downward from the lower end of the first annular tapered surface;
The second inclination angle formed with the horizontal plane of the second annular tapered surface is configured to be larger than the first inclination angle formed with the horizontal plane of the first annular tapered surface,
A tool holder characterized by that. In a processing device for detachably mounting a tool holder with a tool mounted on a chuck portion of a spindle,
The tool holder includes an engagement shaft portion at an upper end portion, a first annular taper surface continuous downward from the lower end of the engagement shaft portion, and a second annular taper surface continuous downward from the lower end of the first annular taper surface. A second inclined taper surface having a second inclined angle with the horizontal plane and a larger first inclined angle with the horizontal plane of the first annular tapered surface;
The chuck portion includes an engagement hole into which an engagement shaft portion of the tool holder is fitted, a first annular engagement surface that is continuous with a lower end of the engagement hole and can be engaged with a first annular tapered surface, A second annular engagement surface that is continuous with the lower end of the first annular engagement surface and is engageable with the second annular tapered surface;
A processing apparatus characterized by that. In a sewing machine equipped with a needle bar that is driven up and down by a sewing machine motor via a sewing machine spindle and a presser bar for mounting a presser foot that holds the work cloth.
A chuck provided at the lower end of at least one of the needle bar and the presser bar;
A plurality of types of tools that can be attached to and detached from the chuck portion, each comprising a plurality of types of tools having a tool holder,
The tool holder includes an engagement shaft portion at an upper end portion, a first annular taper surface continuous downward from the lower end of the engagement shaft portion, and a second annular taper surface continuous downward from the lower end of the first annular taper surface. A second annular tapered surface having an angle with the horizontal plane that is greater than the first annular tapered surface;
The chuck portion includes an engagement hole into which an engagement shaft portion of the tool holder is fitted, a first annular engagement surface that is continuous with a lower end of the engagement hole and can be engaged with a first annular tapered surface, A second annular engagement surface that is continuous with the lower end of the first annular engagement surface and is engageable with the second annular tapered surface;
A sewing machine characterized by that. An annular groove is provided on the outer periphery of the lower portion of the engagement shaft portion,
The sewing machine according to claim 3, wherein a ball lock mechanism that locks an engagement shaft portion of the tool holder via a ball that engages with the annular groove is provided in the chuck portion.   The sewing machine according to claim 3 or 4, further comprising a key mechanism for rotationally restricting the tool holder to the chuck portion. The sewing machine according to claim 3, wherein the tool includes a sewing needle, a cloth presser, and a cutter for cutting a work cloth.

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