JP6394248B2 - Sewing machine provided with cloth feeding device and cloth feeding device - Google Patents

Description

  The present invention relates to a cloth feeding device and a sewing machine including the cloth feeding device.

  The sewing machine includes a cloth feeding device. The cloth feeding device moves the cloth in the X-axis direction and the Y-axis direction in synchronization with the vertical movement of the sewing needle of the sewing machine in order to form a predetermined stitch on the cloth. The cloth feeding device included in the sewing machine disclosed in Patent Document 1 includes a movable table, a cloth holding body, an X-axis motor, a Y-axis motor, a drive shaft, and a guide block. The moving table is provided so as to be able to reciprocate in the X-axis direction and the Y-axis direction. The cloth holder is provided on the moving table. The cloth holding body includes a presser base arm, a cloth presser, and a guide rail. The presser base arm is fixed to the movable base and extends in the Y-axis direction. The presser foot is connected to the tip of the presser foot arm. The cloth presser can hold the cloth. The guide rail extends in the X-axis direction. The central portion of the guide rail in the extending direction is connected to the proximal end portion of the presser base arm. The X-axis motor reciprocates the moving table in the X-axis direction. The Y-axis motor is connected to the drive shaft. The drive shaft extends in the Y-axis direction. The guide block is fixed to one end of the drive shaft. The guide block is connected to the guide rail. The guide block guides the guide rail moving in the X-axis direction. When the X-axis motor reciprocates on the moving table, the cloth holder reciprocates in the X-axis direction. In this case, the position of the presser arm relative to the drive shaft is displaced. When the Y-axis motor is driven, the drive shaft reciprocates the guide rail through the guide block. The cloth holder reciprocates in the Y-axis direction.

Japanese Patent Publication No. 6-93946

  When the Y-axis motor is intermittently driven in synchronization with the vertical movement of the sewing needle, the cloth holding body repeats movement and stop in the Y-axis direction in a short time. In this case, the inertial force acts on the cloth holding body, and the guide rail extending in the X-axis direction bends in the Y-axis direction. Therefore, the cloth swings in the Y-axis direction. When the presser arm and the drive shaft are at the same position in the X-axis direction, the guide rail has the highest rigidity in the Y-axis direction. The greater the displacement between the presser arm and the drive shaft in the X-axis direction, the lower the rigidity of the guide rail in the Y-axis direction. That is, the rigidity of the guide rail with respect to the Y-axis direction varies depending on the position of the cloth holder in the X-axis direction.

  However, if the rigidity of the cloth holding body changes greatly as the cloth holding body moves in the X-axis direction, the amount of deflection of the cloth in the Y-axis direction also changes greatly. In this case, when the cloth holding body is temporarily stopped, a deviation amount between the position where the cloth is actually stopped and the ideal stop position of the cloth varies depending on the position of the cloth holding body in the X-axis direction. Therefore, when the sewing machine sews, there is a possibility that any sewing will easily occur.

  The objective of this invention is providing the sewing machine provided with the cloth feeding apparatus which can stabilize the runout amount of a cloth, and a cloth feeding apparatus, when stopping the cloth to move temporarily.

  The cloth feeding device according to claim 1 includes a motor, a rod-shaped rod-like member extending in a first direction parallel to the horizontal direction and driven to reciprocate in the first direction by the motor, and a guide provided at one end of the rod-like member. A cloth holding body that can hold the cloth, the cloth holding body that can be moved in a second direction parallel to the horizontal direction and perpendicular to the first direction, and the cloth holding body. In a cloth feeding device comprising: a movement support mechanism that supports reciprocation in each of the direction and the second direction; and a movement mechanism that moves the cloth holder in the second direction via the movement support mechanism. The cloth holding body is movably connected to the guide portion in the second direction, extends in the second direction, extends in the second direction, and the rail portion is guided in the first direction. An extension part that supports from the opposite side of the part, A holding portion capable of holding the cloth, and the extending portion is connected to the rail portion at both ends in the extending direction. A central portion of the direction is opposed to the rail portion with a gap therebetween. When the motor is driven and the rod-shaped member is reciprocated in the first direction, the rail portion reciprocates in the first direction via the guide portion. Therefore, the cloth holder moves back and forth in the first direction. The moving mechanism reciprocates the cloth holder in the second direction. When the cloth holding body moves in the second direction, the relative position of the rail portion with respect to the guide portion is displaced. Here, the cloth holding body from the end position where the guide portion contacts the second direction one end portion of the rail portion to the central position where the guide portion contacts the second direction center portion of the rail portion. When moved, the rigidity of the cloth holder in the first direction increases. However, since the central portion of the extending member in the extending direction is opposed to the rail portion with a gap therebetween, even if the cloth holding body moves to the center position, the increase in the rigidity of the cloth holding body is reduced. That is, even if the position of the cloth holding body in the second direction is displaced, the rigidity of the cloth holding body in the first direction hardly changes. Therefore, when the cloth holding body moves intermittently in the first direction, even if the inertial force acts on the cloth holding body, the amount of bending of the cloth holding body in the first direction is unlikely to vary. Therefore, the cloth feeding device can stabilize the amount of movement of the cloth when the moving cloth is temporarily stopped.

  3. The cloth feeding device according to claim 2, wherein the guide portion includes a pair of holding portions that are opposed to each other with the rail portion interposed therebetween, and that guide the rail portion to be movable. You may provide in the position which guides the said rail part from both sides. Since the guide portion is not interposed between the extended portion and the rail portion, the length of the rail portion and the extended portion in the first direction is shortened. Therefore, the cloth feeding device can be miniaturized.

  4. The cloth feeding device according to claim 3, wherein the holding portion is provided on an arm portion extending from the extending portion toward the side opposite to the rail portion, and a tip portion of the arm portion, and is capable of holding the cloth. And a holding part. The length of the arm part and the extending part in the first direction is shortened, and the arm part extends from the extending part toward the side opposite to the rail part, thereby increasing the length of the entire cloth feeding device in the first direction. Without this, the length of the arm portion in the first direction can be secured. The operator can easily place the cloth held by the cloth holding unit. Therefore, the cloth feeding device can improve the workability of handling the cloth.

  5. The cloth feeding device according to claim 4, wherein the rail portion has a shape in which an end surface on the extension portion side is formed in a planar shape orthogonal to the first direction, and the extension portion is in the extension direction. The center portion may be recessed so as to be separated from the end surface along the first direction rather than the both end portions. Since the central part of the extending part in the extending direction is recessed from both ends, the amount of bending of the cloth holding body in the first direction can easily coincide with the amount of movement of the cloth. Therefore, the cloth feeding device can further stabilize the amount of movement of the cloth when the moving cloth is temporarily stopped.

  According to a fifth aspect of the present invention, there is provided a sewing machine including the cloth feeding device. The sewing machine has the same effect as the cloth feeding device.

The perspective view of the sewing machine 1. FIG. The right view of the sewing machine 1. FIG. The perspective view from the upper left of the sewing machine 1 which abbreviate | omitted the pedestal part 3 and the arm part 4. FIG. The perspective view from the upper left of the cloth feeding apparatus. The perspective view from the upper right of the cloth feeding apparatus. Exploded perspective view of the cloth holder 50 The left view of the shaft 68, the guide member 69, and the rail part 76. FIG. The top view of the cloth holding body 50 in a center position. The top view of the cloth holding body 50 in an edge part position. The top view of the cloth holding body 50 in which the assembly displacement has occurred. The enlarged plan view of the frame support part 96 and the presser frame 84 in which the assembly displacement has occurred. FIG. 11 is a cross-sectional view taken along the line I-I in FIG. 10.

  Hereinafter, a sewing machine 1 according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the upper direction, the lower direction, the left diagonally downward direction, the right diagonally upward direction, the left diagonally upward direction, and the right diagonally downward direction in FIG. The X-axis direction is the left-right direction of the sewing machine 1. The Y-axis direction is the front-rear direction of the sewing machine 1.

  The structure of the sewing machine 1 will be briefly described. As shown in FIGS. 1 and 2, the sewing machine 1 includes a bed part 2, a pedestal part 3, an arm part 4, and a control part (not shown). The bed part 2 includes a front part 8 and a rear part 9. The front portion 8 is located in front of the sewing machine 1 and the rear portion 9 is located behind the sewing machine 1. The front part 8 includes a work table support part 18 (see FIG. 2) and a storage part 89. The worktable support portion 18 is provided so as to protrude forward from the front wall of the housing portion 89. The worktable support unit 18 includes the worktable 5 on the upper surface. The work table 5 is provided with a needle plate 12 (see FIG. 1) substantially in the center. The needle plate 12 is provided with a needle hole (not shown) at substantially the center. The worktable support unit 18 includes a shuttle mechanism (not shown) inside. The pedestal 3 is erected on the upper part of the rear part 9. The arm part 4 extends forward from the upper part of the pillar part 3. The arm portion 4 includes a tip portion 7 at the front end portion. The upper surface of the needle plate 12 faces the lower end portion 7. The tip portion 7 includes a needle bar (not shown). A needle bar (not shown) is attached to the lower end of the needle bar. The needle bar is connected to a sewing machine motor (not shown) provided on the rear side inside the arm portion 4. When the sewing machine motor is driven, the sewing needle moves up and down. The accommodating part 89 is a substantially rectangular parallelepiped box shape whose upper side opens. The accommodating portion 89 accommodates the lower shaft 6 (see FIG. 4), the cloth feeding device 10 and the like inside. The worktable support portion 18 and the interior of the accommodating portion 89 communicate with each other. The lower shaft 6 extends in the front-rear direction, and the front end portion is connected to the shuttle mechanism. The lower shaft 6 drives the shuttle mechanism. The shuttle mechanism forms a seam in a cloth (not shown) in cooperation with a vertically moving sewing needle. The control unit stores sewing data for the sewing machine 1 to perform sewing.

  An outline of the cloth feeding device 10 will be described. The cloth feeding device 10 includes a cloth holding body 50. The cloth holding body 50 holds the cloth (not shown) on the work table 5 with a cloth (not shown) interposed between a presser frame 84 and a holding frame 87 which will be described later. The cloth holding body 50 can reciprocate in the left-right direction and the front-rear direction. The cloth feeding device 10 reciprocates the cloth holding body 50 in the left-right direction and the front-rear direction in synchronization with the drive of a sewing machine motor (not shown).

  Next, the structure of the cloth feeding device 10 will be described. As illustrated in FIGS. 3 to 5, the cloth feeding device 10 includes a movement support mechanism 20, an X-axis drive mechanism 30, a Y-axis drive mechanism 60, and a cloth holder 50. The movement support mechanism 20 is a mechanism that supports the cloth holder 50 so as to be capable of reciprocating in the left-right direction and the front-rear direction. The X-axis drive mechanism 30 is a mechanism that reciprocates the cloth holding body 50 in the left-right direction via the movement support mechanism 20. The Y-axis drive mechanism 60 is a mechanism that reciprocates the cloth holder 50 in the front-rear direction via the movement support mechanism 20.

  The movement support mechanism 20 includes a front support member 21, a rear support member 22, a pair of X axis fixed rails 24 and 25, an X axis guide member 26, an X axis movement member 40, a pair of Y axis fixed rails 51 and 52, and Y. A shaft guide member 53 (see FIG. 5), a Y-axis moving member 73 (see FIG. 5), and the like are provided.

  The front support member 21 and the rear support member 22 are fixed to the inner bottom surface of the accommodating portion 89 (see FIG. 1). The front support member 21 and the rear support member 22 have a substantially rectangular shape that is long in the left-right direction in plan view, and are arranged in the front-rear direction. The front support member 21 and the rear support member 22 include insertion holes 21A and 22A (see FIG. 4), respectively. The insertion holes 21 </ b> A and 22 </ b> A penetrate the front-side support member 21 and the rear-side support member 22 in the front-rear direction through the center portions in the left-right direction. The lower shaft 6 is inserted through the insertion holes 21A and 22A.

  The pair of X-axis fixed rails 24 and 25 are substantially rectangular in a side view and extend in the left-right direction. The X-axis fixed rail 24 is fixed to the upper surface of the front support member 21, and the X-axis fixed rail 25 is fixed to the upper surface of the rear support member 22. The X-axis guide member 26 is provided so as to be capable of reciprocating in the left-right direction with respect to each of the pair of X-axis fixed rails 24 and 25. The X-axis moving member 40 is a plate-like member having a substantially rectangular shape in plan view, and is fixed to the upper surface of the X-axis guide member 26. The X-axis guide member 26 is provided at positions corresponding to the front and rear, and left and right ends of the X-axis moving member 40.

  The pair of Y-axis fixed rails 51 and 52 are fixed to the upper surface of the X-axis moving member 40. The pair of Y-axis fixed rails 51 and 52 has a substantially rectangular shape when viewed from the front, and extends in the front-rear direction. The pair of Y-axis fixed rails 51 and 52 are arranged in the left-right direction. The Y-axis guide member 53 is provided so as to be capable of reciprocating in the front-rear direction with respect to each of the pair of Y-axis fixed rails 51 and 52. In FIG. 5, only the Y-axis guide member 53 provided on the Y-axis fixed rail 51 is shown. The Y-axis moving member 73 is a plate-like member having a substantially rectangular shape in plan view, and is fixed to the upper surface of the Y-axis guide member 53. The Y-axis guide member 53 is provided at a position corresponding to the right end portion and the left end portion of the Y-axis moving member 73.

  The X-axis drive mechanism 30 includes a left rotation shaft 34, a gear 33, an X-axis motor 31, a left pulley 36, a right rotation shaft (not shown), a right pulley 38, an endless belt 29, and the like. The left rotation shaft 34 is rotatably supported at the left end portions of the front support member 21 and the rear support member 22. The left rotation shaft 34 extends in the front-rear direction. A rear end portion of the left rotation shaft 34 projects rearward from the rear support member 22 and extends rearward of the housing portion 89. The gear 33 is fixed to the rear end portion of the left rotation shaft 34. The X-axis motor 31 is provided on the right rear side of the left rotation shaft 34 and is fixed to the outside of the rear surface of the accommodating portion 89. The X-axis motor 31 is located to the left of the rear part 9. A gear (not shown) is fixed to the drive shaft 32 of the X-axis motor 31. The gear fixed to the drive shaft 32 and the gear 33 mesh with each other.

  The left pulley 36 (see FIG. 5) is fixed at a position between the pair of X axis fixed rails 24 and 25 on the left rotating shaft 34. The right rotation shaft (not shown) is rotatably supported at the right end portion of the front support member 21 and the right end portion of the rear support member 22. The right pulley 38 (see FIG. 5) is fixed at a position between the pair of X-axis fixed rails 24 and 25 on the right rotation shaft. The endless belt 29 is bridged between the left pulley 36 and the right pulley 38. The upper surface of the endless belt 29 located between the upper part of the left pulley 36 and the upper part of the right pulley 38 is fixed to the X-axis moving member 40.

  The structure of the cloth holding body 50 will be described with reference to FIGS. In FIG. 6, illustration of a rail portion 76 (see FIG. 7) and a sandwiching frame 87 (see FIG. 5) which will be described later is omitted. As shown in FIG. 5, the cloth holding body 50 includes a sandwiching frame 87, a fixing member 70, and a holding member 90. The sandwiching frame 87 is formed in a plate shape, and the base end portion is fixed to the upper surface of the Y-axis moving member 73. The sandwiching frame 87 extends forward from the upper surface of the Y-axis moving member 73 along the horizontal direction. The sandwiching frame 87 includes a frame portion 87A at the tip. The frame portion 87A is a substantially rectangular frame body in plan view. The frame portion 87A forms an opening 87B on the inner side. The opening 87B has a substantially rectangular shape in plan view.

  The fixing member 70 is fixed to the upper surface of the Y-axis moving member 73 with the proximal end portion of the holding frame 87 interposed therebetween. As shown in FIG. 6, the fixing member 70 includes an extending portion 74 and a rail portion 76 (see FIGS. 7 and 8). The extending portion 74 extends in the left-right direction. The extension part 74 includes a support part 72, a right extension part 75, and a left extension part 71. The support part 72, the right extension part 75, and the left extension part 71 are integrally formed. The support part 72 has a substantially rectangular parallelepiped shape. The support portion 72 is fixed to the upper surface of the Y-axis moving member 73 and is installed behind the proximal end portion of the sandwiching frame 87 (see FIG. 5). The upper surface 72A of the support portion 72 is formed in a planar shape parallel to the horizontal direction. The upper surface 72A includes four fastening holes 42. The fastening holes 42 are formed at the four corners of the upper surface 72A. In FIG. 6, two fastening holes 42 among the four fastening holes 42 are illustrated.

  The right extension 75 extends from the right surface of the support 72 to the right. The left extension 71 extends leftward from the left surface of the support 72. The right extension 75 and the left extension 71 are symmetrical with respect to the support 72. In order to avoid overlapping description, only the structure of the right extension 75 of the right extension 75 and the left extension 71 will be described below.

  The right extending portion 75 includes a contact portion 75A, an upper protruding portion 75B, and a lower protruding portion 75C. The contact portion 75A is a substantially rectangular plate-like member that is long in the left-right direction when viewed from the front. The upper projecting portion 75B projects forward from the upper end portion of the contact portion 75A, and the lower projecting portion 75C projects forward from the lower end portion of the contact portion 75A. The upper protruding portion 75B is positioned below the upper surface 72A of the support portion 72, and the lower protruding portion 75C is positioned above the lower surface of the support portion 72. The upper protruding portion 75B and the lower protruding portion 75C protrude forward as they move toward the support portion 72 side.

  Here, the left rear surface of the contact portion 75 </ b> A of the right extending portion 75 is flush with the rear surface of the support portion 72. The left rear surface of the contact portion 75A and the rear surface of the support portion 72 are positioned in front of the right rear surface of the contact portion 75A. The right rear surface of the contact portion 75A protrudes rearward from the left rear surface. The left extension 71 is symmetrical to the right extension 75 with respect to the support 72. Therefore, the extended portion 74 includes a concave portion 74 </ b> A that is recessed forward in the center in the left-right direction of the rear surface of the extended portion 74 formed by the left-side extended portion 71, the support portion 72, and the right-side extended portion 75.

  As shown in FIG. 7, the rail portion 76 has a substantially rectangular shape in side view and extends in the left-right direction. The rail portion 76 is disposed on the rear side of the extending portion 74 (see FIG. 8). The rail portion 76 includes a front surface 76A (see FIG. 7) as an end surface on the extending portion 74 side. The front surface 76A has a planar shape extending in the left-right direction and the up-down direction. The front surface 76 </ b> A is fixed to the right rear surface of the right extending portion 75 and the left rear surface of the left extending portion 71. The central part in the left-right direction of the front surface 76A is located behind the recess 74A. The center part in the left-right direction of the rail part 76 and the center part in the left-right direction of the extending part 74 have a gap by the recess 74A. That is, the central portion in the left-right direction of the rail portion 76 and the central portion in the left-right direction of the extending portion 74 are opposed to each other with a gap therebetween.

  The rail portion 76 includes a groove portion 76B on each of the upper surface and the lower surface. The groove portion 76B is curved and dented from the upper surface and the lower surface of the rail portion 76 toward the central portion in the vertical direction of the rail portion 76 in a side view. The groove portion 76B extends along the left-right direction. In addition, illustration of the groove part 76B is abbreviate | omitted in FIG.4, FIG.5, FIG.8-10.

  As shown in FIG. 6, the holding member 90 includes an arm portion 81 and installation portions 92 and 94 (see FIGS. 4 and 6). The arm portion 81 protrudes forward from the upper surface 72A of the support portion 72 while being curved upward. The installation parts 92 and 94 are installed on the upper surface 72 </ b> A of the support part 72. The installation portions 92 and 94 are formed in a plate shape parallel to the horizontal direction. The installation part 92 is formed on the right side of the base end part of the arm part 81 (see FIG. 6), and the installation part 94 is formed on the left side (see FIG. 4). The installation portions 92 and 94 each include two through holes 41. The two through holes of the installation portion 94 are not shown. Each through hole 41 is formed in a portion of the installation portions 92 and 94 facing each fastening hole 42 on the upper surface 72A. The inner diameter of each through hole 41 is larger than the inner diameter of each fastening hole 42.

  The installation portions 92 and 94 are detachably fixed to the upper surface 72A of the support portion 72 by four screw members 46, four spring washers 48, and four flat washers 49. The screw member 46 has a shaft portion 46A and a head portion 46B. The shaft portion 46 </ b> A is inserted into a spring washer 48 and a flat washer 49 positioned below the spring washer 48. The outer diameter of the shaft portion 46 </ b> A is slightly larger than the inner diameter of the fastening hole 42 and smaller than the inner diameter of the through hole 41. The shaft portion 46 </ b> A is inserted into the through hole 41 and fastened to the fastening hole 42. The head portion 46B is provided at the upper end portion of the shaft portion 46A. In other words, the head portion 46B is provided at the end of the shaft portion 46A opposite to the support portion 72 with respect to the installation portion 92. The head 46 </ b> B is larger than the inner diameter of the through hole 41. The head 46 </ b> B presses the installation portions 92 and 94 downward via the spring washer 48 and the flat washer 49. That is, the head portion 46B fixes the installation portions 92 and 94 between the upper surface 72A. Therefore, the installation parts 92 and 94 are detachably fixed to the upper surface 72A of the support part 72. Here, by providing the flat washer 49 between the head 46B and the upper surface 72A, even if the screw member 46 is firmly fastened, the upper surface 72A pressed by the head 46B is hardly damaged. By providing the spring washer 48 between the head part 46B and the upper surface 72A, the fastened screw member 46 is difficult to loosen. The spring washer 48 and the flat washer 49 may not be provided. In FIG. 6, in order to make the drawing easy to understand, a fastening hole 42 having an inner diameter smaller than the actual diameter is shown (the same applies to FIG. 12).

  The arm part 81 includes a frame support part 96 at the tip part. The frame support portion 96 is a plate-like member having a substantially rectangular shape when viewed from the front. As shown in FIG. 5, the frame support portion 96 has two rail portions 82 on the front surface. The two rail portions 82 extend in the vertical direction. An L-shaped connecting portion 83 that is L-shaped in a side view is attached to each of the two rail portions 82 so as to be movable in the vertical direction. The two L-shaped connecting portions 83 hold the presser frame 84. The presser frame 84 is a substantially rectangular frame in plan view. The rear end portion of the presser frame 84 is connected to the lower surface of the L-shaped connecting portion 83. Therefore, the presser frame 84 can move up and down together with the L-shaped connecting portion 83. The presser frame 84 forms an opening 84A on the inner side. The opening 84 </ b> A has a substantially rectangular shape in plan view, and faces the opening 87 </ b> B of the sandwiching frame 87. The size of the opening 84A is substantially the same as the size of the opening 87B. The operator places a cloth (not shown) on the upper surface of the sandwiching frame 87, lowers the presser frame 84, and sandwiches the cloth with the sandwiching frame 87. Therefore, the cloth holder 50 holds the cloth.

  3 to 5, the Y-axis drive mechanism 60 includes a Y-axis motor 65, a gear (not shown), a shaft 68, a guide member 69, and the like. The Y-axis motor 65 is provided on the upper right side of the X-axis motor 31 and is located above the rear part 9 of the bed part 2. A drive shaft 66 (see FIG. 5) of the Y-axis motor 65 extends in the left-right direction. A gear (not shown) is fixed to the drive shaft 66. The shaft 68 extends below the drive shaft 66 in the front-rear direction. The shaft 68 includes a tooth portion 67 extending in the front-rear direction on the upper surface. The tooth portion 67 meshes with a gear (not shown) fixed to the drive shaft 66.

  The guide member 69 is fixed to the front end portion of the shaft 68. The guide member 69 is disposed on the rear side of the rail portion 76. As shown in FIG. 7, the guide member 69 is substantially C-shaped when viewed from the left side and extends in the left-right direction. The guide member 69 includes a facing portion 61 and a pair of clamping portions 62. The facing portion 61 has a substantially rectangular shape when viewed from the back, and faces the rear surface of the rail portion 76 from the rear. The facing portion 61 is fixed to the front end portion of the shaft 68. The pair of sandwiching portions 62 protrude forward from the upper end portion and the lower end portion of the facing portion 61, respectively. The pair of sandwiching portions 62 has a substantially rectangular shape in side view. Each of the pair of sandwiching portions 62 includes a convex portion 62 </ b> A that protrudes toward a direction close to each other at the center portion in the front-rear direction.

  The guide member 69 holds a plurality of balls 56 arranged in the left-right direction at a portion of the base end portion of the pair of sandwiching portions 62 on the center portion side of the facing portion 61 in the vertical direction. The guide member 69 holds a plurality of balls 59 arranged in the left-right direction at the tip of each convex portion 62A. The plurality of balls 56 and 59 have the same shape and are embedded in a rotatable manner.

  In the guide member 69, each convex portion 62A enters each groove portion 76B of the rail portion 76, so that the plurality of balls 59 abut on each convex portion 62A, and the plurality of balls 56 are arranged at the corners on the rear upper side of the rail portion 76 and It contacts the rear lower corner. Therefore, the guide member 69 is connected to the rail portion 76. A pair of clamping part 62 guides the rail part 76 so that a movement to the left-right direction is possible. The rail portion 76 can move smoothly in the left-right direction with respect to the guide member 69 by rotation of the plurality of balls 56 and 59.

  An outline of the operation of the cloth feeding device 10 will be described with reference to FIGS. 4 and 5. First, the operation of the cloth feeding device 10 reciprocating the cloth (not shown) in the left-right direction will be described. When the X-axis motor 31 is driven, the drive shaft 32 is rotated, and the left rotation shaft 34 is rotated by meshing between a gear (not shown) fixed to the drive shaft 32 and the gear 33. Since the left rotation shaft 34 rotates, the left pulley 36 rotates. When the left pulley 36 rotates, the right pulley 38 (see FIG. 5) rotates, and the endless belt 29 travels clockwise and counterclockwise in a side view. As the endless belt 29 travels, the X-axis moving member 40 reciprocates left and right along the pair of X-axis fixed rails 24 and 25. Therefore, the Y-axis moving member 73 (see FIG. 5) and the cloth holding body 50 reciprocate in the left-right direction. When the cloth holding body 50 reciprocates in the left-right direction, the rail portion 76 reciprocates in the left-right direction with respect to the guide member 69 (see FIGS. 8 and 9). That is, when the cloth holder 50 reciprocates in the left-right direction, the relative position in the left-right direction of the rail portion 76 with respect to the guide member 69 is displaced. Hereinafter, the position in the left-right direction of the cloth holding body 50 where the left end portion of the rail portion 76 contacts the guide member 69 is referred to as an end position (see FIG. 8), and the center portion in the left-right direction of the rail portion 76 contacts the guide member 69. The position in the left-right direction of the cloth holding body 50 is referred to as the center position (see FIG. 9). The end position refers to the position in the left-right direction of the cloth holding body 50 where the left end portion of the rail portion 76 contacts the guide member 69, but the same applies to the position where the right end portion of the rail portion 76 contacts the guide member 69. .

  An operation in which the cloth feeding device 10 reciprocates the cloth in the front-rear direction will be described. When the Y-axis motor 65 is driven, the drive shaft 66 (see FIG. 5) rotates. The shaft 68 is driven to reciprocate in the front-rear direction by the meshing of a gear (not shown) fixed to the drive shaft 66 and the tooth portion 67 of the shaft 68. The reciprocating shaft 68 reciprocates the rail portion 76 in the front-rear direction via the guide member 69. Therefore, the cloth holder 50 reciprocates in the front-rear direction together with the Y-axis moving member 73 (see FIG. 5). In this case, the Y-axis moving member 73 reciprocates back and forth with respect to the X-axis moving member 40 along the pair of Y-axis fixed rails 51 and 52.

  The cloth feeder 10 intermittently drives the X-axis motor 31 and the Y-axis motor 65 in synchronization with the drive of a sewing machine motor (not shown). Therefore, the cloth holding body 50 repeats the movement and stop along the left-right direction and the front-rear direction in a short time. The cloth feeder 10 intermittently reciprocates the cloth held by the presser frame 84 and the sandwiching frame 87 on the work table 5 in the left-right direction and the front-rear direction in synchronization with the vertical movement of the sewing needle. Therefore, the sewing machine 1 forms predetermined stitches on the cloth.

  With reference to FIG. 8, FIG. 9, the difference in the rigidity with respect to the front-back direction of the fixing member 70 in the case where the cloth holding body 50 is positioned at the end position and the center position will be described. In the following description, the central portion in the left-right direction of the rail portion 76 is referred to as a central portion 76C, and the left end portion of the rail portion 76 is referred to as a left end portion 76D. In FIG. 8 and FIG. 9, the two rail portions 82, the two L-shaped connecting portions 83, the presser frame 84, and the sandwiching frame 87 are not shown.

  As shown in FIG. 8, when the cloth holding body 50 is located at the end position, the shaft 68 is shifted to the left with respect to the arm portion 81 provided at the center portion in the left-right direction of the fixing member 70. Therefore, when the shaft 68 reciprocates the left end portion 76D of the rail portion 76 in the front-rear direction (arrow A direction), the central portion of the extending portion 74 bends in the front-rear direction using the left end portion 76D of the rail portion 76 as a fulcrum. .

  As shown in FIG. 9, when the cloth holding body 50 is located at the center position, when the shaft 68 reciprocates the center portion 76C of the rail portion 76 in the front-rear direction (arrow B direction), the center portion in the left-right direction of the extending portion 74 is used. Bends in the front-rear direction with both ends as fulcrums. The amount of bending of the central portion of the extending portion 74 in the left-right direction is compared to the state in which the central portion of the extending portion 74 and the central portion 76C of the rail portion 76 are in contact with no gap (the state having no concave portion 74A). growing.

  When the cloth holding body 50 moves from the end position to the center position, the shaft 68 and the arm portion 81 are positioned on the same straight line, so that the rigidity of the fixing member 70 in the front-rear direction increases. However, since the central portion 76C of the rail portion 76 and the central portion of the extending portion 74 are opposed to each other with a gap, the amount of increase in the rigidity of the fixing member 70 in the front-rear direction is reduced. That is, even if the position of the cloth holding body 50 in the left-right direction is displaced, the rigidity of the fixing member 70 in the front-rear direction is unlikely to change.

  The cloth feeding device 10 intermittently drives the X-axis motor 31 and the Y-axis motor 65 in accordance with sewing data stored by a control unit (not shown) of the sewing machine 1. When the Y-axis motor 65 is driven, the shaft 68 intermittently reciprocates the fixed member 70. The cloth holder 50 repeats the movement and stop in the front-rear direction in a short time. In this case, an inertial force acts on the fixing member 70. The central part in the left-right direction of the extending part 74 bends in the front-rear direction, and the cloth held by the holding member 90 swings. Therefore, the cloth held by the holding member 90 does not stop at an ideal position, and any sewing may occur. However, in this embodiment, the rigidity of the fixing member 70 in the front-rear direction is less likely to vary even if the position of the cloth holder 50 in the left-right direction is displaced. Stabilize. Therefore, the deflection amount in the front-rear direction of the holding member 90 due to the bending of the central portion in the left-right direction of the extending portion 74 is stabilized. Since the shake amount is stabilized, the deviation amount between the position where the cloth actually stops and the ideal stop position is stabilized. Therefore, the correction of the deviation based on the deviation amount is easy. If the operator of the sewing machine 1 holds a predetermined correction value based on the amount of deviation, the sewing machine 1 can easily suppress any occurrence of sewing.

  Next, a method for adjusting the fixing position of the holding member 90 with respect to the fixing member 70 will be described with reference to FIGS. As shown in FIGS. 10 and 11, the cloth holder 50 is fixed to the Y-axis moving member 73 (see FIG. 5) and the guide member 69 due to dimensional errors and assembly errors of various members constituting the cloth holder 50. In some cases, the frame support portion 96 and the presser frame 84 may be shifted from proper positions. In FIG. 11, a state where the frame support portion 96 and the presser frame 84 are at appropriate positions is indicated by a two-dot chain line, and a state where the frame support portion 96 and the presser frame 84 are displaced from the appropriate positions is indicated by a solid line. In this case, the movement range of the cloth deviates from the ideal range.

  Hereinafter, the cloth holding body 50 is moved to the Y-axis moving member 73 (see FIG. 5) in a posture in which the arm portion 81 of the cloth holding body 50 is not in an appropriate posture extending in the front-rear direction but in a posture extending diagonally right forward from the fixing member 70. The case where it is assembled to the guide member 69 will be described as an example. In this case, the frame support portion 96 is shifted to the right side from an appropriate position.

  The operator of the sewing machine 1 loosens the four screw members 46. As shown in FIG. 12, the head 46 </ b> B is spaced upward from the spring washer 48. The holding member 90 is movable by the gap between the through hole 41 and the shaft portion 46A. As shown in FIGS. 10 and 11, the operator rotates the holding member 90 clockwise (in the direction of arrow C) in the horizontal direction with respect to the fixed member 70 in a plan view. The holding member 90 rotates while sliding with respect to the upper surface 72 </ b> A (see FIG. 6) of the support portion 72. The frame support portion 96 and the presser frame 84 move to appropriate positions (two-dot chain lines in FIG. 11). An operator fastens the four screw members 46 again to fix the holding member 90 to the fixing member 70. Therefore, the operator can adjust the fixing position of the holding member 90 with respect to the fixing member 70 in the horizontal direction. The range of the cloth that the cloth feeding device 10 moves coincides with the ideal movement range.

  In the above description, since the arm portion 81 of the holding member 90 extends obliquely with respect to the front-rear direction, the example in which the operator rotates the holding member 90 has been described. However, the position of the holding member 90 is changed from the ideal position to the front-rear direction. The same applies to the case of shifting in the left-right direction. That is, the operator may move the holding member 90 in the left-right direction and the front-rear direction after loosening the four screw members 46. The operator can adjust the fixing position of the holding member 90 in the horizontal direction.

  As described above, the rail portion 76 is connected to the guide member 69 from the front side. The rail portion 76 can reciprocate in the left-right direction with respect to the guide member 69. The front surface 76 </ b> A of the rail portion 76 is fixed to the rear surface of the right side portion from the center portion in the left-right direction of the right extension portion 75 and from the center portion of the left extension portion 71 in the left-right direction. That is, the extending portion 74 supports the rail portion 76 from the side opposite to the guide member 69 in the front-rear direction. The extending portion 74 forms a recessed portion 74 </ b> A that is recessed forward in the left-right direction central portion of the rear surface of the left extending portion 71, the support portion 72, and the right extending portion 75. Both ends in the left-right direction of the extending portion 74 are connected to the rail portion 76. The center part in the left-right direction of the rail part 76 and the center part in the left-right direction of the extending part 74 have a gap by the recess 74A. That is, the central portion in the left-right direction of the extending portion 74 faces the rail portion 76 with a gap therebetween. Even if the position of the cloth holder 50 in the left-right direction is displaced, the rigidity of the fixing member 70 in the front-rear direction is unlikely to change. Therefore, even when the inertia force acts on the fixing member 70 when the cloth holding body 50 moves intermittently in the front-rear direction, the amount of bending at the center in the left-right direction of the extending portion 74 provided in the fixing member 70 is unlikely to vary. . The amount of run-out of the cloth held by the holding member 90 is stabilized. Therefore, the sewing machine 1 can stabilize the amount of movement of the cloth when the moving cloth is temporarily stopped. By stabilizing the amount of runout of the cloth, the sewing machine 1 can suppress any occurrence of sewing.

  The guide member 69 is provided at a position where the pair of holding portions 62 guides the rail portion 76 from both sides in the vertical direction. Since the guide member 69 is not interposed between the extending portion 74 and the rail portion 76, the length of the fixing member 70 in the front-rear direction is shortened. Therefore, the sewing machine 1 can downsize the cloth feeding device 10.

  The arm portion 81 of the holding member 90 extends from the upper surface 72A of the support portion 72 of the fixing member 70 toward the front side opposite to the rail portion 76. The length of the fixing member 70 in the front-rear direction is shortened. Therefore, the length in the front-rear direction of the arm portion 81 of the holding member 90 can be secured without increasing the length in the front-rear direction of the cloth feeding device 10. The sewing machine 1 can secure a space for the operator to place the cloth held by the holding frame 87 and the presser frame 84 provided on the distal end side of the arm portion 81. Therefore, the sewing machine 1 can improve the workability of cloth handling.

  A front surface 76A of the rail portion 76 extends in the up-down direction and the left-right direction, and is orthogonal to the front-rear direction. The extending portion 74 is recessed such that the center portion in the left-right direction is spaced apart from the front surface 76A in the front-rear direction from both ends. The extending portion 74 installs the holding member 90 on the upper surface 72 </ b> A of the support portion 72. Therefore, when an inertial force acts on the fixing member 70 of the cloth holding body 50 as the shaft 68 is intermittently driven, the central portion of the extending portion 74 is easily bent with both left and right end portions as fulcrums. The amount of deflection of the extending portion 74 and the amount of fabric shake easily match. Therefore, the sewing machine 1 can further stabilize the runout amount of the cloth when the cloth is moved intermittently and when the moving cloth is temporarily stopped. Therefore, the sewing machine 1 can further suppress the occurrence of any sewing.

  In the above description, the guide member 69 corresponds to the guide portion of the present invention. The Y-axis motor 65 corresponds to the motor of the present invention. The shaft 68 corresponds to the rod-shaped member of the present invention. The holding member 90 corresponds to the holding portion of the present invention. The frame support portion 96 corresponds to the cloth holding portion of the present invention. The X-axis drive mechanism 30 corresponds to the moving mechanism of the present invention. The front surface 76A corresponds to the end surface of the present invention. The front-rear direction corresponds to the first direction of the present invention. The left-right direction corresponds to the second direction of the present invention.

  The present invention is not limited to the above embodiment, and various modifications can be made. The holding member 90 may not be installed on the upper surface 72 </ b> A of the support portion 72 of the fixing member 70. Instead of being provided on the upper surface 72A, the fixing member 70 may be provided on the front side portion.

  The upper surface 72A of the support portion 72 of the fixing member 70 may not have a planar shape parallel to the horizontal direction. For example, a flat shape inclined with respect to the horizontal direction or an uneven shape may be used.

  The holding member 90 may include only one of the installation portions 92 and 94. Further, the holding member 90 may not include the installation portions 92 and 94. In this case, instead of providing the through holes 41 in the installation portions 92 and 94, a through hole that penetrates the base end portion of the arm portion 81 in the vertical direction may be provided.

  The holding member 90 may not be fixed to the fixing member 70 by the screw member 46. For example, instead of the screw member 46, the holding member 90 may be fixed to the fixing member 70 with bolts and nuts.

  The number of fastening holes 42 formed in the upper surface 72A of the support portion 72 may not be four. There may be at least two fastening holes 42. For example, when the number of the fastening holes 42 is two, the fastening holes 42 may be provided at any two of the four corners of the upper surface 72A, or at the left and right ends of the upper surface 72A at substantially the center in the front-rear direction.

  In the present embodiment, when the cloth holder 50 is in the end position, the rigidity of the fixing member 70 in the front-rear direction is the lowest, but the present invention is not limited to this. For example, when the cloth holding body 50 is in the center position, a gap is formed between the center part in the left-right direction of the extension part 74 and the center part in the left-right direction of the rail part 76 so that the rigidity of the fixing member 70 is reduced most. You may face each other.

  The center part in the left-right direction of the extending part 74 may not have a shape recessed forward than both end parts. For example, the extending portion 74 may extend linearly in the left-right direction, and the center portion 76C of the rail portion 76 may be recessed rearward from both end portions. For example, the extended portion 74 may be provided with spacers at both ends in the left-right direction, and both ends in the left-right direction of the rail portion 76 may be fixed to the spacers. Moreover, the center part 76C of the left-right direction of the extending part 74 and the center part 76C of the rail part 76 may each be dented in the direction spaced apart from each other.

  The guide member 69 may not be provided at a position where the pair of sandwiching portions 62 guide the rail portion 76 from both sides in the vertical direction. For example, the guide member 69 may be provided at a position where the pair of sandwiching portions 62 guide the rail portion 76 from both the front and rear sides. In this case, one of the pair of sandwiching portions 62 is interposed between the rail portion 76 and the extending portion 74.

DESCRIPTION OF SYMBOLS 1 Sewing machine 10 Cloth feed apparatus 20 Movement support mechanism 30 X-axis drive mechanism 50 Cloth holding body 62 A pair of clamping part 65 Y-axis motor 68 Shaft 69 Guide member 70 Fixing member 74 Extension part 76 Rail part 76A Front surface 81 Arm part 90 Holding | maintenance Member 96 Frame support

Claims (5)

A motor,
A rod-like rod-shaped member extending in a first direction parallel to the horizontal direction and driven to reciprocate in the first direction by the motor;
A guide portion provided at one end of the rod-shaped member;
A cloth holding body that is capable of holding a cloth, and is connected to the guide portion so as to be movable in a second direction parallel to the horizontal direction and perpendicular to the first direction;
A movement support mechanism for supporting the cloth holder in a reciprocating manner in each of the first direction and the second direction;
A cloth feeding device comprising: a movement mechanism that moves the cloth holder in the second direction via the movement support mechanism;
The cloth holder is
A rail portion connected to the guide portion so as to be movable in the second direction, and extending in the second direction;
An extending portion extending in the second direction and supporting the rail portion from the opposite side to the guide portion in the first direction;
Provided in a central portion in the extending direction of the extending portion, and a holding portion capable of holding the cloth,
The extending portion has a cloth feeding device in which both end portions in the extending direction are connected to the rail portion, and a central portion in the extending direction is opposed to the rail portion with a gap therebetween.   The guide portion includes a pair of holding portions that are arranged opposite to each other with the rail portion interposed therebetween and that guide the rail portion to be movable, and the pair of holding portions guide the rail portion from both sides in the vertical direction. The cloth feeding device according to claim 1, wherein the cloth feeding device is provided at a position. The holding part is
An arm portion extending from the extending portion toward the opposite side of the rail portion;
The cloth feeding device according to claim 2, further comprising: a cloth holding portion that is provided at a distal end portion of the arm portion and can hold the cloth. The rail portion has a shape in which an end surface on the extension portion side is a plane shape orthogonal to the first direction,
The said extending part is a shape dented so that the said center part of the said extending direction may be spaced apart from the said end surface along the said 1st direction rather than the said both ends. The cloth feeding device according to any one of the above.   A sewing machine comprising the cloth feeding device according to any one of claims 1 to 4.

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