CN106245239B - Clamping mechanism and sewing machine with same - Google Patents

Abstract

The invention can sew various curved surfaces. The clamping mechanism is provided with: a plurality of clamping units (40) which are provided with a pair of clamping components (41, 42) for clamping sewed objects (C1, C2) and a supporting block (44) for supporting the pair of clamping components; and a frame (31) to which the support block is attached, the frame having one or more elongated hole-shaped attachment holes (32-35) formed along a curved line or a plurality of straight lines along the curved line, the plurality of clamping units being attached so as to be adjustable in position along the attachment holes of the frame.

Description

Clamping mechanism and sewing machine with same

Technical Field

The present invention relates to a clamping mechanism for sewing a curved-surface-shaped object to be sewn and a sewing machine provided with the clamping mechanism.

Background

For example, in sewing of shoes, a toe portion and a heel portion of a shoe upper formed of left and right members are sewn in a loop shape, and a sewing member such as a label or a reinforcing member is sewn to the outer side of the heel portion.

The heel part of the upper of the shoe needs to be finished into a curved shape in accordance with the shape of the heel of the foot, but in order to sew the shoe in a curved state, a so-called high seam table (post bed) sewing machine is used in which a pot and a needle plate are provided upright from the upper surface of a sewing machine base part along the upper side so that the cloth on both sides of the sewing position can be curved.

In addition, sewing by automatic feeding along a pattern corresponding to the outer shape of the sewing member is also required for a sewn article having a curved surface shape such as a heel portion of an upper of the shoe.

However, a sewing machine that performs sewing by automatic feed according to a predetermined pattern is generally configured to place a workpiece on a plane and move the workpiece according to plane coordinates for each needle to perform sewing.

In order to solve this problem, the conventional sewing machine includes: a cylindrical support body for holding a curved-surface-shaped object to be sewn; and a stepping motor that rotates the support body arbitrarily, and the sewing machine realizes automatic feed sewing along the circumferential surface (see, for example, patent document 1).

Patent document 1: japanese laid-open patent publication No. 61-265169

However, the conventional sewing machine described above has a structure in which the cylindrical support body is rotated, and therefore, there is a problem in that the mechanism becomes large and the entire sewing machine becomes large.

Further, since the cylindrical support body has a fixed size, it is necessary to prepare support bodies of various sizes in order to sew objects of various sizes.

In particular, in the case of footwear, the size division is very fine, and since the footwear has a left-right difference, it is necessary to prepare a plurality of supports having different sizes.

Disclosure of Invention

The invention aims to provide a clamping mechanism capable of realizing sewing aiming at various curved surfaces and a sewing machine with the clamping mechanism.

(1) The present invention is a clamping mechanism, comprising:

a plurality of clamping units, which are provided with a pair of clamping components for clamping the sewed object and a supporting block for supporting the pair of clamping components; and

a frame mounting the support block,

the frame has one or more mounting holes in the form of long holes formed along a curved line or a plurality of straight lines along the curved line,

the plurality of clamping units are installed to be adjustable in position along the installation holes of the frame.

(2) The present invention is characterized in that, in the clamping mechanism described in (1),

the clamping surface of the clamping part is formed by one or more flat surfaces.

(3) The present invention is characterized in that, in the clamping mechanism described in (1),

the clamping surface of the clamping part is formed by a curved surface.

(4) The present invention is characterized in that, in the clamping mechanism described in any one of (1) to (3),

the pair of clamping members extend toward the opposite side of the frame from the support block,

the support block supports the pair of clamping members so as to be capable of position adjustment in the extending direction of the pair of clamping members.

(5) The present invention is characterized in that, in the clamping mechanism described in any one of (1) to (4),

the needle dropping device is provided with an avoidance guide part for avoiding a hanging part hanging from the sewed object clamped by the clamping component from a needle dropping position.

(6) The invention is a sewing machine, characterized by comprising:

a swing mechanism that swings the clamp mechanism described in any one of (1) to (5) about an axis that is located inside a curved line of the curvature of the mounting hole of the frame;

an axis moving mechanism for relatively moving the clamping mechanism and the needle bar along the axis of the swing of the clamping mechanism; and

and a control device for controlling the driving source of the swing mechanism and the driving source of the axial line moving mechanism to drop the needle to an arbitrary position of the sewing object.

(7) The invention is characterized in that, in the sewing machine described in (6),

the needle bar is provided with a middle presser foot which moves up and down in linkage with the needle bar.

(8) The present invention is characterized in that, in the sewing machine described in (7),

comprises a needle plate for dropping needles,

a projection is provided at a needle falling position of the needle plate, and the projection presses the sewn object from above and below in cooperation with the lowered middle presser foot.

ADVANTAGEOUS EFFECTS OF INVENTION

In the present invention, since the plurality of clamp units for holding the material to be sewn can be adjusted in position along one or more elongated hole-shaped mounting holes formed along the curved line, the material to be sewn can be held along the curved surface formed along the curved line, and the occurrence of wrinkles and hooks after sewing the material to be sewn having the curved surface can be suppressed, thereby achieving satisfactory sewing.

Further, since the position of each clamp unit is adjustable along the mounting hole, by changing the unit interval, it is possible to favorably hold the annular objects to be sewn in various sizes, and it is not necessary to prepare a plurality of clamp mechanisms having different sizes.

Further, since each clamp unit is adjustable in position along the mounting hole, even a sewn object having various curved surfaces with different curvature radii can be sewn satisfactorily by the adjustment in position.

In addition, since the cylindrical support is not required, the sewing machine can be downsized.

Drawings

Fig. 1 is a perspective view of a sewing machine according to the present embodiment.

Fig. 2 is a perspective view of the sewing machine according to the present embodiment after the table has moved.

Fig. 3 is a block diagram showing a control system of the sewing machine of fig. 1.

Fig. 4 is an oblique view of the first clamping mechanism mounted on the sewing machine.

Fig. 5 is a front view of the first clamping mechanism.

Fig. 6 is a rear view of the first clamping mechanism.

Fig. 7 is a side view of the pressing support mechanism of the first clamping mechanism.

Fig. 8 is an oblique view of the second clamping mechanism mounted on the sewing machine.

Fig. 9 is a rear view of the second clamping mechanism.

Fig. 10 is a front view of the first clamping mechanism provided with the avoidance guide.

Fig. 11 is an explanatory view showing a problem of the middle presser foot.

Fig. 12 is an explanatory view showing a boss portion for solving the problem of the middle presser foot.

Description of the reference numerals

11 middle presser foot

15 needle plate

16 convex part

30 first clamping mechanism

31 frame

32. 33 upper side mounting hole

34. 35 lower side mounting hole

38. 39 avoidance guide

40. 40A-40D clamping unit

41 upper clamping part

42 lower clamping part

43 pressing and supporting mechanism

44 support block

50 second clamping mechanism

51 frame

52. 53 upper side mounting hole

54. 55 lower side mounting hole

60. 60A-60C clamping unit

61. 611, 612 upper clamping member

62. 621, 622 lower clamping member

64 support block

70 swing mechanism

73 swing motor (Driving source)

80-axis moving mechanism

83 Axis moving motor (Driving source)

90 control device

100 Sewing machine

321. 322, 331, 332 straight line part

341. 342, 351 and 352 straight line parts

411. 412, 421, 422 plane

611. 612 upper clamping part

621. 622 underside clamping part

A1-A4 circular arc

C1 shoe upper (sewed fabric)

C2 reinforcing material (sewed fabric)

C3 label (sewed fabric)

C11 tiptoe (lower vertical part)

Detailed Description

[ integral Structure of Sewing machine ]

Next, a sewing machine 100 as an embodiment of the present invention will be described with reference to fig. 1 to 9. The sewing machine 100 is an automatic sewing machine which performs needle drop at an arbitrary position according to a predetermined sewing pattern using first and second clamping mechanisms 30 and 50 suitable for holding a workpiece having a curved surface.

Fig. 1 and 2 are oblique views illustrating a part of the sewing machine 100 with a part of the structure omitted, and fig. 3 is a block diagram showing a control system of the sewing machine.

In the following description, an example is given in which a reinforcing member C2 and a label C3 as a sewn object are sewn to a heel portion of a shoe upper C1 (see fig. 5) as a looped shoe as a sewn object.

The sewing machine 100 includes: a needle bar holding a sewing needle at a lower end portion; a needle bar up-and-down moving mechanism which moves the needle bar up and down; a kettle mechanism for catching the upper thread passing through the sewing needle and winding the lower thread; a middle presser foot mechanism which moves the middle presser foot 11 up and down; a first clamping mechanism 30 that holds upper C1 and reinforcement material C2; a second clamping mechanism 50 that holds upper C1 and tag C3; a swing mechanism 70 for swinging the first and second clamp mechanisms 30 and 50; an axis moving mechanism 80 for moving the first and second clamping mechanisms 30 and 50 along the swing axes thereof; a sewing machine frame 20 for storing or mounting the above-mentioned components; and a controller 90 for controlling the above structures to drop the needle at any position of the shoe upper C1, the reinforcing member C2, and the label C3.

The sewing machine frame 20 includes: a sewing machine base part 21 located at a lower part; a vertical body part 22 rising from the sewing machine base part 21; and a sewing machine arm 23 extending from an upper end of the longitudinal body 22 in parallel with the sewing machine bed 21.

In fig. 1 and 2, covers of the respective parts of the sewing machine frame 20 are not shown, and the internal structure thereof is also not shown.

The needle bar up-and-down moving mechanism comprises: a sewing machine motor 12; an upper shaft rotated by the sewing machine motor 12; and a crank mechanism for converting the rotational force of the upper shaft into a driving force for moving up and down and applying the driving force to the needle bar.

The kettle mechanism is provided with: so-called horizontal kettles; a kettle shaft supporting the horizontal kettle; a lower shaft rotated by the sewing machine motor 12; and a transmission mechanism for transmitting the rotational force from the lower shaft to the kettle shaft, which is a known structure, and therefore, a detailed description thereof is omitted.

The sewing machine 100 is a so-called sewing machine with a sewing bed (post bed), and a horizontal pot is built in an upper part of the sewing bed (post bed)24, and the sewing bed 24 is vertically provided at a position below a sewing needle at the sewing machine bed 21.

The middle presser foot mechanism is provided with: a middle presser bar holding a middle presser 11 at a lower end portion; and a crank mechanism for converting the rotational force of the upper shaft into a driving force for moving up and down and applying the driving force to the middle presser bar.

The middle presser foot 11 has a cylindrical portion into which the sewing needle is loosely inserted, and this cylindrical portion has a function of pressing the sewn object from above and pressing the sewn object to float when the sewing needle is lifted.

The middle presser foot mechanism performs a transmission operation so that the middle presser foot 11 moves up and down at the same cycle as the sewing needle and later than the sewing needle. Thus, the sewing needle is pulled up to push the sewing object to be lifted, and the sewing needle is pulled out from the sewing object well.

[ first clamping mechanism ]

Fig. 4 is an oblique view, fig. 5 is a front view, and fig. 6 is a rear view of the first clamping mechanism 30.

The first clamping mechanism 30 includes: four clamp units 40A to 40D arranged in series in the Y-axis direction and clamping the upper C1 and the reinforcing member C2 in an overlapping manner; and a frame 31 that supports the respective clamp units 40A to 40D.

Since the four clamp units 40A to 40D have substantially the same structure and structure, in the following description, the clamp units 40A to 40D are collectively referred to as the clamp unit 40, the same reference numerals are used for the structures of the respective portions of the clamp units 40A to 40D, the common contents are generally described, and the different points of the clamp units 40A to 40D are individually described.

The frame 31 of the first clamping mechanism 30 is an elongated flat plate, and the direction parallel to the flat plate surface of the frame 31 and parallel to the longitudinal direction thereof is the Y-axis direction, the direction parallel to the flat plate surface of the frame 31 and orthogonal to the longitudinal direction thereof is the Z-axis direction, and the direction perpendicular to the flat plate surface of the frame 31 is the X-axis direction, and the respective parts of the first clamping mechanism 30 will be described.

The clamp unit 40 includes: a pair of clamp members including an upper clamp member 41 and a lower clamp member 42, the upper clamp member 41 being disposed above the upper C1 and the reinforcement member C2, and the lower clamp member 42 being disposed below the upper C1 and the reinforcement member C2; a pressing support mechanism 43 that presses the upper clamping member 41 toward the lower clamping member 42; and a support block 44 supporting the upper clamping member 41 and the lower clamping member 42.

The lower clamp member 42 is a long plate-like member extending in the X-axis direction and extends from the support block 44 toward the side opposite to the frame 31.

Of the four clamp units 40A to 40D, the lower clamp members 42 of the two clamp units 40B, 40C located at the center in the Y-axis direction have upper surfaces constituted by two flat surfaces 421, 422 (clamp surfaces) parallel to the X-axis direction, and the lower clamp members 42 of the two clamp units 40A, 40D located at both ends in the Y-axis direction have upper surfaces constituted by one flat surface 421 (clamp surface) parallel to the X-axis direction.

As shown in fig. 5, the flat surfaces 421 and 422 of the upper surfaces of the lower clamp members 42 of the clamp units 40A to 40D are arranged in an upward convex arc when viewed in the X-axis direction.

Each lower clamp member 42 is attached to the support block 44 by a screw 441 in a state in which the upper surface of the end portion on the support block 44 side is in contact with the lower surface of the support block 44.

Each of the support blocks 44 includes a stepped portion that abuts against a side end portion of the lower clamp member 42 on one end portion side in the Y axis direction. Further, a long hole 442 extending in the X axis direction is formed vertically through the support block 44, and a screw 441 is inserted into the long hole 442 from above and into a screw hole of the lower clamp member 42.

Therefore, the screw 441 is screwed out, the lower clamping member 42 is moved in the X-axis direction by sliding contact with the lower surface of the support block 44 and the stepped portion, and the screw 441 is fastened at an arbitrary position, whereby the extension length of the lower clamping member 42 with respect to the support block 44 can be adjusted.

The shape of the extending end of each lower clamp member 42 as viewed in the Z-axis direction is similar to the shape of the side edge of the reinforcement member C2. Therefore, the reinforcing material C2 can be held at the vicinity of the needle drop position along the side edge portion during sewing.

The upper clamping member 41 is a plate-like member, and is supported by a support block 44 via a pressing support mechanism 43 in a state where the lower surface side thereof faces the upper surface of the lower clamping member 42.

Of the four clamp units 40A to 40D, the upper clamp members 41 of the two clamp units 40B and 40C located at the center in the Y axis direction have lower surfaces formed by two flat surfaces 411 and 412 (clamp surfaces) parallel to the X axis direction, and the upper clamp members 41 of the two clamp units 40A and 40D located at both ends in the Y axis direction have lower surfaces formed by one flat surface 411 (clamp surface) parallel to the X axis direction.

As shown in fig. 5, the flat surfaces 411 and 412 of the lower surfaces of the upper clamping members 41 of the clamping units 40A to 40D are arranged in an upward convex arc when viewed in the X-axis direction.

The flat surfaces 411 and 412 on the lower surface of the upper clamp member 41 of the clamp units 40A to 40D are parallel to the flat surfaces 421 and 422 on the upper surface of the lower clamp member 42, respectively, and hold the upper C1 and the reinforcing member C2 sandwiched between the upper clamp member 41 and the lower clamp member 42 substantially along the circumferential surface including the arc.

Fig. 7 is a side view of the clamping unit 40.

The pressing support mechanism 43 includes: a movable block 431 attached to the upper surface of the upper clamp member 41 by a screw; a base 432 fixedly equipped to the upper surface of the supporting block 44; an operation lever 433 that switches the upper clamp member 41 between a holding position facing the lower clamp member 42 and a release position separated from the lower clamp member 42 by a turning operation; a swivel wrist 434 that supports the upper clamp member 41 via the movable block 431; and a link member 435 that couples the base 432 and the operating lever 433.

The base 432 is coupled to a lower portion of one end of the swing arm 434 at one end in the X-axis direction so as to be pivotable about the Y-axis, and is coupled to one end of the link member 435 at the other end in the X-axis direction so as to be pivotable about the Y-axis.

The operation lever 433 has one end portion coupled to an upper portion of one end portion of the swing arm 434 so as to be rotatable about the Y axis, and has the other end portion serving as an input operation portion for switching between a holding position and a release position. Further, the other end of the link member 435 is coupled to the vicinity of one end of the operating lever 433 and at a position slightly closer to the other end thereof so as to be rotatable about the Y axis.

Thus, the base 432, the lever 433, the wrist 434, and the link member 435 constitute a four-joint link mechanism.

In this configuration, if the input operation portion of the operation lever 433 is rotated downward, the connection point between the operation lever 433 and the link member 435 is located lower than the straight line connecting the connection point between the operation lever 433 and the swing arm 434 and the connection point between the link member 435 and the base portion 432. In this state, the upper C1 and the reinforcing member C2 are clamped between the upper clamping member 41 and the lower clamping member 42, and even if the operation lever 433 is pushed back by its restoring force, the force is not transmitted in the direction of pushing up the input operation portion of the operation lever 433, and the clamped state can be maintained.

Further, a long hole 434b extending in the X axis direction is formed vertically through the pivot arm 434, and is coupled to the movable block 431 by a screw 434a inserted through the long hole 434 b. Therefore, the movable block 431 can be moved to an arbitrary position in the X-axis direction with the screw 434a being screwed out, and can be fixed at the position by tightening the screw 434 a.

That is, the upper clamping member 41 can be arbitrarily adjusted in position in the X-axis direction. As described above, since the lower clamp member 42 is also adjustable in position in the X-axis direction, the width that can be clamped between the upper clamp member 41 and the lower clamp member 42 can be adjusted by adjusting the positions of the two members.

As described above, the support block 44 supports the upper clamping member 41 on the upper surface side and the lower clamping member 42 on the lower surface side.

The support block 44 has an end surface portion abutting against the flat plate surface of the frame 31 at an end portion opposite to the extending end portion of the upper clamp member 41 and the lower clamp member 42, and is supported by the frame 31 in a state where the end surface portion is closely contacted.

As shown in fig. 6, the frame 31 is a flat plate elongated in the Y-axis direction and formed in a substantially arch shape.

In order to attach the four clamp units 40A to 40D to the frame 31, upper attachment holes 32 and 33 and lower attachment holes 34 and 35 are formed vertically in a line-like elongated hole formed by a plurality of straight lines along an arc which is a curved line.

The upper mounting holes 32, 33 are formed at one end portion and the other end portion in the Y-axis direction at the frame 31, and have two linear portions 321, 322 and 331, 332, respectively.

Each of the linear portions 321, 322, 331, and 332 is formed along a common arc a1, and the arc a1 is set at a central position below the frame 31.

The lower attachment holes 34 and 35 are formed in one end portion and the other end portion in the Y axis direction of the frame 31, and have two linear portions 341 and 342 and 351 and 352, respectively.

Each of the linear portions 341, 342, 351, 352 is formed along a common arc a2, and the arc a2 is set at a central position below the frame 31. The arc a2 is concentric with the arc a1 and has a smaller diameter than the arc a 1.

The upper mounting holes 32 and 33 are divided into two, but may be connected to form one upper mounting hole, and in this case, may be formed by a plurality of linear portions. The same applies to the lower mounting holes 34, 35.

The support block 44 of each of the clamp units 40A to 40D has two screw holes formed in an end surface portion on the frame 31 side so as to be vertically aligned, and is fixed to the frame 31 by fastening screws 36 and 37 (see fig. 7) inserted into the upper mounting hole 32 and the lower mounting hole 34 or the upper mounting hole 33 and the lower mounting hole 35, respectively.

By screwing out the screws 36 and 37, the position of each clamp unit 40 can be adjusted along the upper mounting hole 32 and the lower mounting hole 34, or the upper mounting hole 33 and the lower mounting hole 35. That is, each clamp unit 40 can be adjusted in position substantially along the arcs a1, a 2. Further, the position can be adjusted while maintaining a fixed posture with respect to the centers of the two arcs a1 and a 2.

Further, the support block 44 may be mounted to either the upper mounting hole or the lower mounting hole on a single axis, and may be angularly adjustable about the single axis. In this case, the clamp units 40 do not maintain a fixed posture with respect to the centers of the two circular arcs a1 and a2, but are not limited to circular arcs, and the object to be sewn may be flexed in a more abundant shape.

[ second clamping mechanism ]

Fig. 8 is an oblique view of the second clamping mechanism 50, and fig. 9 is a rear view.

Note that, in the second clamping mechanism 50, the same reference numerals are given to the same structures or structures as those of the first clamping mechanism 30, and overlapping descriptions are omitted, and the description is mainly given of the differences from the first clamping mechanism 30.

The second clamping mechanism 50 includes: three clamping units 60A to 60C arranged in series in the Y-axis direction to clamp the upper C1 and the tag C3; and a frame 51 supporting the clamping units 60A to 60C.

Similarly, in the case of the three clamp units 60A to 60C, the clamp units 60 are collectively referred to as a clamp unit 60, and the configurations of the respective parts included in the clamp units 60A to 60C are described using the same reference numerals, and the differences between the clamp units 60A to 60C will be described individually.

Similarly, in the case of the second clamping mechanism 50, a direction parallel to the plate surface of the frame 51 and parallel to the longitudinal direction thereof is referred to as a Y-axis direction, a direction parallel to the plate surface of the frame 51 and orthogonal to the longitudinal direction thereof is referred to as a Z-axis direction, and a direction perpendicular to the plate surface of the frame 51 is referred to as an X-axis direction.

The clamp unit 60 includes: a pair of clamping members consisting of an upper clamping member 61 and a lower clamping member 62, the upper clamping member 61 being disposed above the upper C1 and the label C3, the lower clamping member 62 being disposed below the upper C1 and the label C3; a pressing support mechanism 43 that presses the upper clamping member 61 toward the lower clamping member 62; and a support block 64 supporting the upper and lower clamping members 61 and 62.

The lower clamp member 62 is a plate-like member, and extends from the support block 64 toward the opposite side from the frame 51.

Of the three clamp units 60A to 60C, the lower clamp member 62 of the clamp unit 60B located only at the center in the Y axis direction is constituted by a pair of lower clamp members 621, 622 aligned in the Y axis direction.

The upper surfaces of the lower clamp members 62, 621, 622 of all the clamp units 60A to 60C are formed by a single plane (clamp surface) parallel to the X-axis direction.

The respective planes of the upper surfaces of the lower clamping members 62, 621, 622 of the clamping units 60A to 60C are arranged along an arc projecting upward when viewed from the X-axis direction.

In addition, the same point as the first clamping mechanism 30 is that the lower clamping members 62 of both the clamping units 60A, 60C are supported by the support block 64 so as to be positionally adjustable in the X-axis direction.

On the other hand, with respect to the center clamping unit 60B, the pair of lower clamping members 621, 622 are respectively supported by the supporting block 64 in a position-adjustable manner in the Y-axis direction.

The shape of the extended end of the lower clamp member 62 of all the clamp units 60A to 60C is similar to the shape of the side edge of the label C3.

The upper clamping member 61 is a plate-like member, and is supported by a support block 64 via a press support mechanism 43 in a state where the lower surface side thereof is opposed to the upper surface of the lower clamping member 62.

Further, only the upper clamping member 61 of the clamping unit 60B located at the center is constituted by a pair of upper clamping members 611, 612 aligned in the Y-axis direction.

The lower surfaces of the upper clamping members 61, 611, and 612 of all the clamping units 60 are formed by one plane (clamping surface) parallel to the X-axis direction.

The lower surfaces of the upper clamping members 61, 611, and 612 of the clamping units 60A to 60C are arranged in an arc shape that projects upward when viewed in the X-axis direction.

In addition, the same point as the first clamping mechanism 30 is that the lower surfaces (clamping surfaces) of the upper clamping members 61, 611, 612 are parallel to the upper surfaces of the opposing lower clamping members 62, 621, 622, respectively.

Since each clamp unit 60 includes the same pressing and supporting mechanism 43 as the first clamp mechanism 30, the description thereof is omitted.

However, the upper clamping members 61 of both the clamping units 60A, 60C are supported by the pressing support mechanism 43 so as to be positionally adjustable in the X-axis direction, but the pair of upper clamping members 611, 612 are supported by the pressing support mechanism 43 with respect to the central clamping unit 60B so as to be positionally adjustable in the Y-axis direction, respectively.

As shown in fig. 9, the frame 51 is a flat plate elongated in the Y-axis direction and formed in a substantially arch shape.

In order to attach the three clamp units 60A to 60C to the frame 51, upper attachment holes 52 and 53 and lower attachment holes 54 and 55 are formed in an up-down arrangement so as to penetrate therethrough, and these attachment holes are long holes formed of a plurality of straight lines along an arc which is a curved line.

The upper side mounting holes 52, 53 are formed in the frame 51 near the center in the Y-axis direction, and are each formed along a common circular arc a3 that sets a center position below the frame 51.

The lower attachment holes 54 and 55 are formed in the frame 51 near the center in the Y axis direction, and are formed along a common arc a4 having a center position set below the frame 51. The arc a4 is concentric with the arc A3 and has a smaller diameter than the arc A3.

The upper attachment holes 52 and 53 are divided into two, but may be connected to form one upper attachment hole, and in this case, may be a polygonal line formed by a plurality of straight portions. The same applies to the lower mounting holes 54 and 55.

The end surface portion of the clamp unit 60A on the frame 51 side of the support block 64 is fixed to the frame 51 by fastening two screws 56 (one is not shown) inserted into the upper attachment hole 52 and the lower attachment hole 54, respectively.

The support block 64 of the clamp unit 60C is fixed to the frame 51 by fastening two screws 56 (one is not shown) inserted into the upper mounting hole 53 and the lower mounting hole 55, respectively, to the end surface portion of the frame 51.

The same point as the first clamping mechanism 30 is that the two clamping units 60A and 60C can be adjusted in position along the upper mounting hole 52 and the lower mounting hole 54, or the upper mounting hole 53 and the lower mounting hole 55, and can be adjusted in position while maintaining a fixed posture.

[ axial moving mechanism ]

The axis moving mechanism 80 includes: a table 81 on which the swing mechanism 70 and the first and second clamp mechanisms 30 and 50 are mounted; a pair of slide guides 82 and 82 that support the table 81 so as to be movable in the direction of the swing axis of the swing mechanism 70; an axis movement motor 83 serving as a drive source for moving the table 81 in the swing axis direction; and a ball screw mechanism 84 that converts the torque of the axis movement motor 83 into a linear motion in the swing axis direction.

The slide guides 82 and 82 are fixedly attached to the upper surface of the sewing machine base 21 so as to be parallel to the swing axis direction. The direction of the swing axis coincides with the longitudinal direction of the sewing machine base 21 and the sewing machine arm 23.

Each of the slide guides 82 and 82 allows the table 81 to slide via four sliders 821 (only one is shown in fig. 1 and 2) provided at a lower portion of the table 81.

The table 81 is a rectangular frame.

The ball screw mechanism 84 includes: a ball nut 841 provided at a corner of the table 81; and a ball screw shaft 842 inserted into the ball nut 841 and coupled to an output shaft of the axis movement motor 83.

The axis moving motor 83 is not particularly limited as long as it is a motor whose operation amount can be controlled, and for example, a stepping motor is used.

With these configurations, the axis moving mechanism 80 can arbitrarily position the upper C1, the reinforcing material C2, and the label C3 held by the first and second clamping mechanisms 30, 50 on the table 81 in the swing axis direction.

[ Oscillating mechanism ]

The swing mechanism 70 includes: a swing frame 71 which is swingably provided about a predetermined swing axis with respect to the table 81 of the axis moving mechanism 80; a swing guide portion 72 that guides the swing of the swing frame 71; a swing motor 73 mounted on the upper surface of the table 81 and serving as a driving source for swinging the swing frame 71; and a transmission mechanism 74 that transmits the torque of the swing motor 73 to the swing frame 71.

The swing frame 71 fixedly supports the first clamp mechanism 30 and the second clamp mechanism 50 such that the extending directions of the pair of clamp members of the first clamp mechanism 30 and the second clamp mechanism 50 are parallel to and opposed to each other. For example, the first clamp mechanism 30 and the second clamp mechanism 50 are coupled in advance in an opposed state, and the clamp mechanisms 30 and 50 are fixedly supported by a toggle link mechanism 711 provided in the swing frame 71.

The swing frame 71 is supported by a swing shaft, not shown, provided below the table 81.

The centers of the arcs along which the lower surfaces of the upper clamp members and the upper surfaces of the lower clamp members of the first and second clamp mechanisms 30 and 50 fixedly supported are positioned on the axis of the swing shaft, and the centers of the arcs a1 and A3 of the upper mounting holes and the arcs a2 and a4 of the lower mounting holes are all positioned on the axis of the swing shaft.

Accordingly, even if the swing frame 71 swings, the distance of the sewing needle or the horizontal kettle from the upper C1, the reinforcing member C2, and the label C3 held by the first clamping mechanism 30 and the second clamping mechanism 50 can be maintained constant.

The swing guide 72 is a guide plate having a guide groove into which a boss-shaped protrusion, not shown, provided on the swing frame 71 is inserted. The guide groove is formed in an arc shape with the swing axis as a center, and suppresses vibration during swing of the swing frame 71 to maintain stable swing motion.

The swing motor 73 is not particularly limited as long as it is a motor whose operation amount can be controlled, and for example, a stepping motor is used.

The transmission mechanism 74 is a so-called belt mechanism, and specifically includes: a drive sprocket 741 provided on an output shaft of the swing motor 73; a driven sprocket, not shown, provided on the swing shaft of the swing frame 71; and a timing belt 742 that is stretched between the driving sprocket 741 and the driven sprocket.

With these configurations, the swing mechanism 70 can arbitrarily control the swing angles of the upper C1, the reinforcing material C2, and the label C3 held by the first and second clamping mechanisms 30, 50 on the table 81.

[ control System of Sewing machine ]

As shown in fig. 3, the control device 90 is connected to: a display panel 94 for displaying various settings related to sewing and the current state of the sewing machine; a setting switch 95 as a screen selection/setting input means provided simultaneously with the display panel 94, for performing various settings at the time of screen selection, and for inputting commands and numerical values at the time of setting input means; and an operation pedal 98 which inputs the start of sewing.

The operation pedal 98 is a means for inputting a drive command for the sewing operation to the control device 90 by a stepping operation. That is, if the operating pedal 98 is depressed, the control device 90 performs operation control for starting sewing.

The operator inputs various parameters for sewing the upper C1 with the reinforcing material C2 and the label C3, for example, setting of sewing pattern data for sewing and selection of sewing pattern, from the setting switch 95.

The sewing machine motor 12, the swing motor 73, and the axis movement motor 83, which are controlled by the control device 90, are connected to the drive circuits 12a, 73a, and 83a, respectively.

The control device 90 includes: a CPU 91 that performs various controls; and a memory 92 in which a control program for controlling the operation of the sewing machine 100 and various sewing data are written.

The memory 92 stores, for example, sewing pattern data.

The sewing pattern data is data including position coordinate data obtained by developing all needle drop positions constituting a sewing pattern for sewing the reinforcing material C2 and the label C3 in a coordinate system constituted by a position in the swing axis direction and a swing angle.

The sewing pattern data is determined for the shoe size and the left and right of the upper C1, and is appropriately selected from these sewing pattern data.

The CPU 91 reads the selected sewing pattern data in accordance with the control program, calculates the operation amounts of the swing motor 73 and the axis movement motor 83 for each stitch in order to position the shoe upper C1, the reinforcing material C2, and the label C3 at each needle fall position constituting the sewing pattern, and performs drive control in synchronization with the sewing machine motor 12 so that the swing motor 73 and the axis movement motor 83 become the calculated operation amounts for each stitch.

[ preparation for Sewing and Sewing actions ]

A flow from a preparation operation for sewing the reinforcement material C2 and the label C3 to the upper C1 of the sewing machine 100 to a sewing operation will be described.

First, one end of the upper C1 and the reinforcement member C2 are provided in the first clamping mechanism 30, and the other end of the upper C1 and the label C3 are provided in the second clamping mechanism 50.

That is, all the clamp units 40A to 40D of the first clamp mechanism 30 are set in the unclamped state by lifting up the operating rod 433. Subsequently, the upper C1 and the reinforcing member C2 are overlapped in a sewn and aligned state, placed on the lower clamping member 42, and clamped by the upper clamping member 41 and the lower clamping member 42 by setting down the operating rod 433.

Similarly, the shoe upper C1 and the label C3 are clamped by the clamping units 60A to 60C of the second clamping mechanism 50.

Subsequently, the first clamping mechanism 30 and the second clamping mechanism 50 are attached to the swing frame 71 of the swing mechanism 70 by the toggle link mechanism 711.

When the preparation operation is completed and the sewing pattern data is selected from the setting switch 95 of the sewing machine 100, the CPU 91 calculates the operation amounts of the swing motor 73 and the axis movement motor 83 for each needle.

When the start of sewing is inputted by operating the pedal 98, the CPU 91 starts driving the sewing machine motor 12, drives the swing motor 73 and the axis line moving motor 83 by the calculated movement amount for each needle in synchronization with the vertical movement of the needle bar, swings and moves the upper C1, the reinforcing material C2, and the label C3 in the axis line direction, and sequentially performs needle drop at the needle drop position determined by the sewing pattern data.

Then, if needle drop is performed at all the needle drop positions specified by the sewing pattern data, the sewing motor 12 is stopped, and the sewing operation is completed.

Then, the first clamp mechanism 30 and the second clamp mechanism 50 are detached from the swing frame 71, and the upper clamp member 41 is set in a released state with respect to all the clamp units 40A to 40D of the first clamp mechanism 30. Similarly, all the clamp units 60A to 60C of the second clamp mechanism 50 are set to the unclamped state.

This allows the upper C1 to be removed after the reinforcement C2 and the label C3 are sewn together, and a series of sewing operations are completed.

[ Effect of the embodiment ]

As described above, in the first clamp mechanism 30 of the sewing machine 100, the frame 31 has the elongated mounting holes 32 to 35 formed along the plurality of straight lines arranged to simulate the arc, and the four clamp units 40A to 40D are mounted to the first clamp mechanism 30 so that the four clamp units 40A to 40D are adjustable in position along the mounting holes 32 to 35 of the frame 31.

Similarly, the frame 51 of the second clamp mechanism 50 has elongated hole-shaped mounting holes 52 to 55 formed along a straight line which is aligned to simulate an arc, and the three clamp units 60A to 60C are mounted to the second clamp mechanism 50 so as to be adjustable in position along the mounting holes 52 to 55 of the frame 51.

Thus, the clamping units are arranged so as to be capable of corresponding to curved surfaces of various sizes, and the sewed object can be held along the curved surfaces, and a support body corresponding to each size is not required. In particular, in the shoe sewing, although the sizes of the objects to be sewn are finely classified, the first and second clamping mechanisms 30 and 50 are particularly effective in that the objects to be sewn can be held in various sizes by adjusting the positions of the clamping means.

Further, since the lower surfaces of the upper clamping members 41, 61 and the upper surfaces of the lower clamping members 42, 62 of the clamping units 40, 60 are formed by one or two flat surfaces in the first and second clamping mechanisms 30, 50, the clamping members can be easily processed. In particular, when the sewing machine is formed by two or more planes, the sewing material can be held in a state closer to the curved surface, and the sewing material having the curved surface shape can be sewn satisfactorily.

The upper clamping members 41, 61 and the lower clamping members 42, 62 of the first and second clamping mechanisms 30, 50 are adjustable in position in the extending direction.

Therefore, the extension amounts of the respective clamp members 41, 42, 61, 62 can be arbitrarily adjusted, and the clamping widths by the upper clamp members 41, 61 and the lower clamp members 42, 62 can be adjusted. Therefore, various sewed articles with different sizes can be well clamped.

Further, the sewing machine 100 includes: a swing mechanism 70 that swings the first and second clamp mechanisms 30, 50 about axes located at all centers of an arc a1 along the upper mounting holes 32, 33 and an arc a2 along the lower mounting holes 34, 35 of the frame 31 of the first clamp mechanism 30, an arc A3 along the upper mounting holes 52, 53 and an arc a4 along the lower mounting holes 54, 55 of the frame 51 of the second clamp mechanism 50; an axis moving mechanism 80 for moving the first and second clamping mechanisms 30 and 50 along the axis of oscillation of the first and second clamping mechanisms 30 and 50; and a control device 90 for controlling the above and for dropping the needle to an arbitrary position of the sewing object.

Therefore, by the combination of the swing and the linear movement, the needle can be accurately dropped on the curved surface of the sewing object, and the sewing quality can be improved.

In the sewing machine 100, the needle position is sequentially stored by sewing pattern data or the like, and thus, the sewing pattern on the curved surface can be automatically sewn.

Further, since the sewing machine 100 includes the middle presser foot 11, and the middle presser foot 11 moves up and down in conjunction with the needle bar, the needle after needle drop can be more reliably pulled out from the workpiece which moves along the swing axis and swings, and the workpiece and the needle can be prevented from being damaged, thereby performing a good movement operation of the workpiece.

[ avoidance guide part ]

Further, when the shoe upper C1 as a sewn object has the toe C11 as a hanging portion which is in a hanging state when it is set in the first clamping mechanism 30, the high sewing table 24 as a needle drop position is provided directly below the shoe upper C1, and there is a possibility that it interferes with the toe C11.

Therefore, as shown in fig. 10, a pair of escape guide portions 38, 39 may be provided in the frame 31 of the first clamping mechanism 30, and the escape guide portions 38, 39 may be used to bring the toe C11 closer to one side in the swing axis direction (the frame 31 side in this example).

The escape guide portions 38 and 39 are arranged further toward the frame 31 than the end surface of the high-seam table 24 on the frame 31 side in the swing axis direction in a state where the first clamping mechanism 30 moves maximally toward the opposite side to the frame 31 side in the swing axis direction in order to avoid interference between the entire guide portions and the high-seam table 24 during swing of the first clamping mechanism 30.

This reduces the occurrence of interference between the toe C11 and the sewing table 24 during sewing, and enables satisfactory sewing.

The escape guide portions 38 and 39 are configured to bring the toe C11 closer to the frame side, but may be configured to bring the toe C11 closer to the opposite side in the swing axis direction.

The evacuation guide portions 38 and 39 are rod-shaped, but may be plate-shaped. Further, the case where two evacuation guides 38 and 39 are provided is exemplified, but only one or three or more evacuation guides may be provided.

The escape guide portions 38 and 39 are not limited to the first clamping mechanism 30, and may be provided in the second clamping mechanism 50.

[ convex part ]

As shown in fig. 11, a pot 14 is built in an upper inner side of the high-sewing table 24, and a needle plate 15 is provided at an upper end portion of the high-sewing table 24, and a needle drop hole (not shown) for dropping the sewing needle 13 is formed in the needle plate 15.

Further, since the reinforcing material C2 and the tab C3 as the sewn object are held by the first or second clamping mechanism 30, 50 so as to follow the curved surface, a gap is generated between the reinforcing material C2 or the tab C3 and the needle plate 15.

In this case, if the middle presser foot 11 is lowered, the sewing is performed in a state where the reinforcing member C2 or the tab C3 is bent downward in order to press the gap, and therefore, there is a possibility that the sewing cannot be performed satisfactorily.

Further, if the reinforcing material C2 or tab C3 is brought close to the needle plate 15 to the maximum extent in order to eliminate the gap, the needle plate 15 and the reinforcing material C2 or tab C3 may slide in contact with each other and be displaced from the clamping mechanisms 30 and 50 or may damage the reinforcing material C2 or tab C3 when the first or second clamping mechanisms 30 and 50 are swung.

Therefore, when the presser foot 11 is used, it is more preferable to provide the projecting portion 16 projecting upward on the periphery of the needle drop position of the needle plate 15, and to press the reinforcing material C2 and the label C3 from above and below by the projecting portion 16 and the lowered middle presser foot 11, thereby performing sewing.

As described above, by providing the projection 16, downward deflection of the reinforcing member C2 and the label C3 due to the center presser 11 can be suppressed, and sewing can be performed while maintaining a state close to the curved surface, thereby achieving more favorable sewing.

In addition, the occurrence of sliding contact of the reinforcing material C2, the label C3, and the needle plate 15 can be reduced by the projection 16.

[ others ]

The upper mounting holes 32, 33, 52, 53 and the lower mounting holes 34, 35, 54, 55 formed in the frames 31, 51 of the first and second clamp mechanisms 30, 50 are formed in one or two straight lines, but may be formed in a plurality of straight lines, circular arcs, or curved lines other than circular arcs.

In particular, when the shape of the material to be sewn is a curved surface other than a curved surface having an arc-shaped cross section, it is preferable that each of the attachment holes is formed in a curved shape corresponding to the cross-sectional shape of the curved surface.

The position of the pivot axis formed by the pivot mechanism 70 is preferably the center of the arc along which each mounting hole extends, but may be closer to the arc side than the center.

In addition, when the shape of the mounting hole is not an arc shape and any one of the mounting holes is a concave shape, the pivot axis may be disposed inside the concave shape.

The lower surface of the upper clamp member and the upper surface of the lower clamp member are not limited to one plane or two or more planes, and may be formed of one curved surface. By forming these curved surfaces, the material to be sewn can be held in a state along the curved surfaces, and more satisfactory sewing can be performed.

In the first clamping mechanism 30 and the second clamping mechanism 50, the number of the clamping units may be at least two or more, and may be increased or decreased.

The clamping members are not limited to plate-like members. For example, the upper and lower clamp members may be constituted by a pair of rods. In this case, the number of the individual clamping units is larger, and it is preferable to further increase the clamping positions to be clamped by the rod.

In the above embodiment, the case of performing sewing using both the first clamping mechanism 30 and the second clamping mechanism 50 has been exemplified, but only one of the first clamping mechanism 30 and the second clamping mechanism 50 may be attached to the sewing machine 100 to perform sewing.

The axial moving mechanism 80 moves the clamp mechanisms 30 and 50 in the axial direction, but is not limited to this, and a mechanism that moves the needle bar in the axial direction or a needle swing mechanism that swings the lower end of the needle bar in the axial direction may be mounted on the sewing machine 100.

Claims (8)

1. A clamping mechanism is characterized by comprising:

a plurality of clamping units, which are provided with a pair of clamping components for clamping the sewed object and a supporting block for supporting the pair of clamping components; and

a frame mounting the support block,

the frame has one or more mounting holes in the form of long holes formed along a curved line or a plurality of straight lines along the curved line,

the plurality of clamping units are installed to be adjustable in position along the installation holes of the frame.

2. The clamping mechanism of claim 1,

the clamping surface of the clamping part is formed by one or more flat surfaces.

3. The clamping mechanism of claim 1,

the clamping surface of the clamping part is formed by a curved surface.

4. The clamping mechanism as recited in any one of claims 1 to 3,

the pair of clamping members extend toward the opposite side of the frame from the support block,

the support block supports the pair of clamping members so as to be capable of position adjustment in the extending direction of the pair of clamping members.

5. The clamping mechanism as recited in any one of claims 1 to 3,

the needle dropping device is provided with an avoidance guide part for avoiding a hanging part hanging from the sewed object clamped by the clamping component from a needle dropping position.

6. A sewing machine is characterized by comprising:

a swing mechanism that swings the clamping mechanism of any one of claims 1 to 5 about an axis that is located inside a curved line of the mounting hole of the frame;

an axis moving mechanism for relatively moving the clamping mechanism and the needle bar along the axis of the swing of the clamping mechanism; and

and a control device for controlling the driving source of the swing mechanism and the driving source of the axial line moving mechanism to drop the needle to an arbitrary position of the sewing object.

7. The sewing machine of claim 6,

the needle bar is provided with a middle presser foot which moves up and down in linkage with the needle bar.

8. The sewing machine of claim 7,

comprises a needle plate for dropping needles,

a projection is provided at a needle falling position of the needle plate, and the projection presses the sewn object from above and below in cooperation with the lowered middle presser foot.

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