JP2007105296A - Buttoning sewing machine and buttoning sewing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform stable sewing of buttons by which the buttons hardly come off without reducing the sewing strength of the buttons. <P>SOLUTION: The buttoning sewing machine is constituted by arranging a button holding mechanism 13 holding a button B, a lower plate 40 for mounting the object C to be sewn, a moving mechanism relatively moving the button, the object to be sewn, and a sewing needle, a looper forming a loop by grasping the sewing thread, and a movement control means 80 driving and controlling a sewing machine 12 and the moving mechanism and carrying out buttoning sewing by the movement control of each section, by arranging an abutting section 43 positioning the distal end section of the folding line L of the cloth C1 of a part of the folded object to be sewn in the lower plate, and by arranging a cloth pressing means 60 pressing the object to be sewn as it remains positioned. Then, the movement control means carries out the movement control alternately needing the front and back portions of the folding line of the object to be sewn. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a button sewing machine and a button attaching method using the button attaching sewing machine.

A conventional sewing machine with a button has a button holding mechanism that holds a button under a sewing needle that moves up and down, a cloth holding means that holds a workpiece under the held button, a held button, and a held button. A moving mechanism that relatively moves the fabric and the sewing needle, and a looper that captures the sewing thread from the lowered sewing needle to form a loop (see, for example, Patent Document 1).
As shown in FIG. 8 (A), the cloth holding means of the sewing machine has a flat plate surface that is substantially perpendicular to the vertical movement direction of the sewing needle N, and its tip is close to the vertical movement path of the sewing needle N. An extended plate-like tongue G is provided.

Then, for example, a button B that is sewn so that a seam is not formed on the lining C2 is sewn on the sewed article C that is formed by overlaying and sewing the two cloths of the outer cloth C1 and the lining C2, such as a decorative button. When doing so, set the fabric C to be folded at the front end of the tongue G2 with the lining C2 inside, and place needle drops alternately at the position I penetrating only the outer surface C1 and the position II in front of the crease. The so-called rake sewing to be performed was performed.
JP 2002-355453 A

However, in the conventional button sewing machine, in order to sew so that no seam is formed on the lining C2, only the outer surface C1 is scooped and sewn, so that the sewing thread T passes only at the front end portion of the folded outer surface C1. . For this reason, as shown in FIG. 8 (B), the passing width H of the sewing thread T of the outer material C1 after button sewing is narrowed, and the sewn button B tends to wobble with respect to the sewing product C and is stable. There was a disadvantage that it was difficult to sew.
Further, since the passing width H of the sewing thread T is narrow and the penetration depth of the sewing thread T with respect to the outer surface C1 is also shallow, there is a disadvantage that the sewing strength of the button B is lowered and the button B is easily removed.
An object of the present invention is to perform stable sewing of buttons.

  The invention described in claim 1 is a button holding mechanism that holds a button below a sewing needle that is driven by a sewing machine motor to move up and down, a lower plate that places a sewing product under the held button, A moving mechanism for relatively moving the held button, the workpiece to be sewn placed on the lower plate, and the sewing needle along a surface intersecting the vertical movement direction of the sewing needle, and a sewing thread from the lowered sewing needle Operation control to sewn buttons on the sewing product while driving and controlling the looper that seizes and forms a loop, the sewing machine motor, and the moving mechanism, and moving the sewing needle, button, and workpiece to move up and down relative to each other A sewing machine comprising a fabric folded along a fold passing through a button sewing position, and a sewing needle can be positioned with respect to the sewing needle by bringing the tip of the fold into contact with each other. like, It has a contact part provided on both the left and right sides of the front end of the plate across the vertical movement path of the sewing needle, and a cloth pressing means for pressing the work to be slid in contact with the crease. The control means adopts a configuration in which operation control of the sewing machine motor and the moving mechanism is performed so that needle dropping is alternately performed before and after the fold portion of the positioned sewing product.

  The moving mechanism includes (1) means for relatively moving the button and the sewing needle along a surface intersecting the vertical movement direction of the sewing needle, and the workpiece and the sewing needle. A mechanism that is individually provided with a means for relatively moving along a plane that intersects the vertical movement direction, and (2) the button and the sewing object are integrally held so as not to cause a positional change between the buttons and the button. In addition, it is meant to include both a mechanism that relatively moves the workpiece and the sewing needle along a surface that intersects the vertical movement direction of the sewing needle. The same applies to the configuration of the second aspect.

  The invention according to claim 2 is a button holding mechanism that holds a button below a sewing needle that is driven by a sewing machine motor to move up and down, a lower plate that places a workpiece to be sewn under the held button, A moving mechanism for relatively moving the held button, the workpiece to be sewn placed on the lower plate, and the sewing needle along a surface intersecting the vertical movement direction of the sewing needle, and a sewing thread from the lowered sewing needle Operation control to sewn buttons on the sewing product while driving and controlling the looper that seizes and forms a loop, the sewing machine motor, and the moving mechanism, and moving the sewing needle, button, and workpiece to move up and down relative to each other And a button-attaching method using a button-attaching sewing machine comprising a plurality of cloths, wherein a part of the cloth to be sewn, in which a plurality of cloths are overlapped and sewn together, is separated from other cloths and passes through the button sewing position. Fold along, Operation of the sewing machine motor and the moving mechanism so that the sewing product is placed on the lower plate while maintaining the folded state, and the needle drop is alternately performed before and after the fold portion of the positioned sewing product by the operation control means. The configuration is to perform control.

According to the first aspect of the present invention, in the case where a button is sewn so that a seam is not formed on a part of the fabric, the operator can At the button sewing position to be sewn, the sewn cloth and the cloth are separated (part of the cloth through which the sewing thread is inserted and the other cloth not inserted through the button sewing are separated).
Then, for the fabric on which button sewing is performed in such a state, the operator folds so as to form a fold along a line passing through the button sewing position, and the tip of the fold formed by folding is folded. Contact the lower plate contact part. Thereby, the position of the crease of the sewing material made of the folded fabric is positioned at a fixed position on the plane of the lower plate. Then, while maintaining the folded state in the positioned state, the sewing product is pressed and fixed by the pressing means.
Then, at the button sewing position located at the front end of the fold, sewing is performed so that needle drop is alternately performed before and after the fold portion (front and back when the direction in which the front end of the fold is directed is the front). .

In the first aspect of the present invention, the presser that holds the folded portion of the fabric to be sewed, which is composed of a plurality of fabrics sewn on top of each other, separated from the other fabric and held in a folded state. Means.
For this reason, unlike conventional sewing machines in which sewing is performed while a portion of the fabric through which the sewing thread is inserted and the fabric that is not inserted are overlapped, the sewing can be performed with the fabric that is not inserted through the sewing thread being separated. Needle drop can be performed at a deeper position with respect to the fold (a rear position when the front end of the fold is the front) without considering the presence of the fabric through which the thread is not inserted. Accordingly, when the work to be sewn is expanded after sewing, it becomes possible to increase the passage width H (see FIG. 7C) of the sewing thread of the fabric, and to reduce the wobbling of the button after sewing and to stabilize Sewing can be performed.
Furthermore, since the passage width H of the sewing thread of the fabric can be widened and the sewing is performed through a part of the fabric, the button can be firmly sewn to the sewing product.

In the invention according to claim 2, when a button is sewn so that a seam is not formed on a part of the cloth to be sewn, which is composed of a plurality of cloths sewn together, At the button sewing position to be sewn, the sewn cloth and the cloth are separated (part of the cloth through which the sewing thread is inserted and the other cloth not inserted through the button sewing are separated).
Then, the fabric for button sewing in this state is folded so as to form a crease along a line passing through the button sewing position, and the workpiece is placed on the lower plate while maintaining the folded state. To do.
Then, sewing is performed so that needle drop is alternately performed before and after the crease portion (front and rear when the direction in which the tip of the crease is directed is forward) with respect to the button sewing position located at the tip of the fold. Done.

In the invention according to the second aspect, a part of the fabric to be sewed on which a plurality of fabrics are overlapped and sewn is folded while being separated from the other remaining fabrics, and the leading end portion is stitched back and forth to sew. Is done.
Therefore, unlike a conventional sewing method in which sewing is performed while a portion of the fabric through which the sewing thread is inserted and the fabric that is not inserted are overlapped, sewing can be performed with the fabric that is not inserted through the sewing thread being separated. Therefore, the needle drop can be performed at a deeper position with respect to the fold (a rear position when the front end of the fold is the front) without considering the presence of the fabric through which the sewing thread is not inserted. Accordingly, when the work to be sewn is expanded after sewing, it becomes possible to increase the passage width H (see FIG. 7C) of the sewing thread of the fabric, and to reduce the wobbling of the button after sewing and to stabilize Sewing can be performed.
Furthermore, since the passage width H of the sewing thread of the fabric can be widened and the sewing is performed through a part of the fabric, the button can be firmly sewn to the sewing product.

(Overall configuration of the embodiment)
Hereinafter, a button sewing machine 100 according to an embodiment of the present invention will be described with reference to FIGS.
1 is an overall perspective view of the button-equipped sewing machine 100, and FIG. 2 is a block diagram showing the main configuration of the button-attached sewing machine 100. As shown in FIG.
The button-attached sewing machine 100 is entirely composed of a sewing machine bed 103 located at the lower part thereof, a sewing machine standing body 101 standing upward from one end of the rear of the sewing machine bed 103, and a sewing machine standing body 101 from above. The sewing machine arm 102 is provided so as to extend along the sewing machine bed 103, and the outline of the sewing machine arm 102 is formed in a substantially U shape.
In the following description, the direction in which the sewing machine arm 102 extends in parallel with the upper surface of the lower plate 40 described later is defined as the Y-axis direction, and the extending direction of the sewing machine arm 102 in FIG. 1 along the Y-axis direction. Is the front side and the opposite direction is the rear side. Further, a direction parallel to the upper surface of the lower plate 40 and orthogonal to the Y-axis direction is taken as an X-axis direction, the left side in FIG. 1 along the X-axis direction is the left side, and the right side in FIG. And Further, the direction perpendicular to the upper surface of the lower plate 40 is defined as the Z-axis direction, the upper direction in FIG. 1 along the Z-axis direction is defined as the upper side, and the lower direction in FIG.

As shown in FIG. 1, the button sewing machine 100 has a vertical movement mechanism (not shown) that drives the sewing needle 11 in the vertical direction while performing needle swing in the left-right direction (X-axis direction) while making the needle swing amount adjustable. ), A button holding mechanism 13 that holds the button B below the sewing needle 11, a lower plate 40 on which a fabric C as a sewing object is placed when sewing without using the tongue 15 described later, and a lower plate 40 A first cloth pressing means 60 for holding the cloth C placed on the upper surface, and a tongue 15 as a cloth holding member for holding the cloth in a state where the cloth is folded by the tip when sewing without using the lower plate 40 described above, The second cloth pressing means 65 for pressing and holding the fabric folded back by the tongue 15 and the cloth C set on the lower plate 40 or the tongue 15 are moved and positioned along the front-rear direction (Y-axis direction). A moving mechanism 50, a button moving mechanism that moves and positions the button B along the left-right direction and the front-rear direction via the button holding mechanism 13, and a looper (not shown) that captures the sewing thread T from the lowered sewing needle 11 to form a loop. And an operation control means 80 for performing operation control of each of the above-described configurations.
In addition, about the structure of these each part in the button sewing machine 100, it does not elaborate here on the conventionally well-known structure, but demonstrates the outline | summary.

(Vertical movement mechanism)
The vertical movement mechanism includes a needle bar that holds the sewing needle 11, a needle bar support frame that is disposed inside the sewing machine arm 102 and supports the needle bar so as to reciprocate along its longitudinal direction, and a sewing machine motor 21. And a transmission mechanism that converts the rotational driving force into a reciprocating driving force in the straight direction and transmits the reciprocating driving force to the needle bar.
The needle bar support frame can support the needle bar in a state along the Z-axis direction (vertical direction) when the needle swing described later is not performed. Therefore, at the time of sewing, the vertical movement mechanism drives the sewing needle 11 in the vertical direction by driving the sewing machine motor 21.

The needle bar support frame is supported in a swingable manner by a support shaft oriented in the Y-axis direction in the sewing machine arm 102, and at the lower end of the needle bar by swinging about the support shaft. It is possible to swing the sewing needle 11 along the X-axis direction (left-right direction).
Further, the vertical movement mechanism has a needle swing motor 35 that rotates around an axis of rotation along the Y-axis direction at an arbitrary reciprocating angular width, and swings at a predetermined rotational angle width by the needle swing motor 35. And a swing arm for performing The swing arm swings at its swing end along the X-axis direction, and the swing end is connected to the needle bar support frame, and the needle bar support frame is set according to the rotational drive amount of the needle swing motor 35. The body can be swung at an arbitrary angle.
As a result, the needle drop motor 35 is driven when the sewing needle 11 is at a position above the fabric, whereby the needle drop can be performed at an arbitrary position in the X-axis direction with respect to the fabric C.

(Cloth movement mechanism)
FIG. 3 is a perspective view showing almost the entire sewing bed 103, and FIG. 4 is an enlarged perspective view showing the configuration of the upper surface of the sewing bed 103 at an intermediate position in the extending direction.
The cloth moving mechanism 50 includes a side plate 51, 51 provided on each of the left and right side surfaces of the sewing machine bed 103, a feed base 52 for holding the side plates 51, 51, and a pinion-rack mechanism (not shown). A cloth Y-axis motor 34 (see FIG. 2) that moves and positions along the axial direction is provided.

The feed base 52 is provided on the upper surface of the sewing machine bed 103 so as to be capable of reciprocating along the Y-axis direction by a slide guide (not shown), and supports the rear end portions of the side plates 51 and 51 on both sides thereof. .
Further, the feed base 52 holds a lower plate 40 and a counter button holding plate 16 described later along the upper surface of the sewing machine bed 103. That is, the lower plate 40 and the counter button holding plate 16 can be moved and positioned along the Y-axis direction by the cloth moving mechanism 50.

  A tongue support shaft 53 is installed on each side plate 51, 51 at the lower part on the front end side. The tongue support shaft 53 is disposed along the X-axis direction, and pivotally supports the base end portion of the tongue 15 so that the distal end portion of the tongue 15 can swing along the Y-axis direction.

(Tang and second cloth holding means)
The tongue 15 is mainly used when scoop stitching and root winding stitching is performed, and the tip end portion extends rearward, and the tip end portion has a spatula shape. It is formed, and mounting is performed with the fabric folded back at the tip.
Further, the base end portion of the tongue 15 is pivotally supported by the tongue support shaft 53 as described above, and the tip end side of the tongue 15 is driven to swing by the tongue cylinder 28 that is an air cylinder via the tongue support shaft 53. It has become.

  On the other hand, at the upper part of the front end side of each of the side plates 51 and 51 described above, a contact plate 66 for contacting the tip of the tongue 15 at the time of sewing and a fabric set on the tongue 15 at the time of the contact are pressed and held from above. There is provided a second cloth pressing means 65 having a cloth holding portion 67 that performs the above and a second cloth pressing cylinder 68 that is an air cylinder that imparts a lifting operation to the cloth holding member 67.

The tongue 15 is provided with a tongue sensor 27 (see FIG. 2) for detecting that the tip of the tongue 15 is rotated in a direction approaching the contact plate 66. When the tongue 15 is detected, the tongue 15 is detected by the operation control means 80. Further, the tongue cylinder 28 attached to the cylinder 15 is driven so that the turning force is applied until the tip of the tongue 15 comes into contact with the contact plate 66.
At the time of sewing using the tongue 15, when the cloth 15 is attached in a folded state at the tip of the tongue 15, and the tongue 15 is manually rotated to the contact portion 66 side, the tongue sensor 27 detects this, and the tongue 15 The cylinder 28 is driven to bring the tip of the tongue 15 into contact with the contact plate 66. Then, by driving the second cloth holding cylinder 68 and lowering the cloth holding member 67, the tongue 15 and the folded cloth are sandwiched between the cloth holding member 67 and the upper surface of the sewing machine bed 103. ing.
Further, when performing sewing without using the tongue 15, the driving of the tongue cylinder 28 is released, and the tip of the tongue 15 can be retracted to a position separated from the contact plate 66.

In addition, since both the tongue 15 and the second cloth pressing means 65 are supported by the cloth moving mechanism 50, the tongue 15 and the second cloth pressing means 65 are connected to the sewing needle 11 when sewing without using the tongue 15. Is moved to a predetermined retracted position in front of the vertical movement path.
At the time of sewing using the tongue 15, the tongue 15 and the contact plate 66 of the second cloth pressing means 65 are moved backward to a predetermined sewing position in the vicinity of the vertical movement path of the sewing needle 11 and the sewing needle is used. It is possible to move and position the tip position of the tongue 15 forward or backward in accordance with the vertical movement of 11. As a result, rake stitching using the tongue 15 and root winding stitching associated therewith are performed.

(Lower plate and first cloth presser)
The lower plate 40, the counter button holding plate 16, and the first cloth pressing means 60 will be described with reference to FIGS. FIG. 5 is an explanatory diagram of a use operation when the lower plate 40 is viewed in plan.
The cloth moving mechanism 50 described above holds the counter button holding plate 16 below the lower plate 40 so that these flat plate surfaces are parallel to the XY plane.
As shown in FIG. 4, the counter button holding plate 16 is formed with a notch 16a through which the sewing needle 11 is inserted at the front end thereof, and a clamping claw 16b for holding the counter button immediately above it. It has. Here, the counter button refers to a button sewn together with the button on the back side of the button sewn on the outer surface of the fabric.

  The lower plate 40 is a substantially flat metal plate as a whole, and the sewing needle 11 is inserted into the front end of the lower plate 40 so as to overlap the notch 16a of the counter button holding plate 16 at the center in the X-axis direction. A notch 41 is formed. And the guide parts 42 and 42 which the front-end | tip each inclined below are formed in the both right and left sides of the notch part 41, respectively. The guide portions 42 and 42 are for guiding to the upper surface without entering the lower side of the lower plate 40 when setting the fabric C to be inserted from the front to the rear of the lower plate 40.

  Furthermore, contact portions 43 and 43 that are raised upward along the XZ plane by bending are provided on both the left and right sides of the front end portion of the lower plate 40 across the vertical movement path of the sewing needle 11. ing. The two abutting portions 43, 43 are erected so as to be aligned at the same position in the Y-axis direction, and the front end portion of the fabric C inserted from the front toward the rear abuts and stops at a fixed position. It has come to be. Further, as shown in FIG. 5A, the abutting position by the abutting portions 43, 43 is rearward of the front end portion of the lower plate 40 and more than the rear end position of the notch portion 41 described above. It is set to be forward.

The contact portions 43, 43 can be positioned with respect to the sewing needle 11 in the Y-axis direction by contacting the tip of the fold line L of the fabric C folded without using the tongue 15 described above. Is to do.
By sewing the sewing needle 11 along the Y-axis direction relative to the fabric C at the tip end portion of the fold line L of the fabric C positioned at the contact portions 43, 43, button sewing is performed by scoop sewing. To wear.
As used herein, “rake stitching” refers to button sewing while alternately dropping needles at the tip of the folded fabric fold and the portion of the fabric that is not in front (the rear in the Y-axis direction). This shows the overall sewing to be performed, and includes not only the case where the sewing thread is passed through the inside of the fabric so as not to penetrate the back of the fabric C but also the case where the sewing thread is penetrated to the back of the fabric C and is sewn.

The first cloth pressing means 60 is fixed to one end of the arm 61 and an arm 61 (partially omitted) supported by one side plate 51 so as to be swingable by a support shaft along the X-axis direction. And a first cloth presser cylinder 63 (see FIG. 2), which is an air cylinder that drives the arm 61 to swing.
The arm 61 is connected to the first cloth presser cylinder 63 at the other end, and swings so that the cloth presser plate 62 at the one end moves up and down.

The cloth presser plate 62 has a front end extending from the rear to the front, and holds the cloth presser by lowering the front end. A rectangular notch 62 a that is slightly larger than the notch 41 of the lower plate 40 is formed at the tip of the cloth presser plate 62.
Since both the first cloth pressing means 60 and the above-described lower plate 40 are supported by the cloth moving mechanism 50, when the cloth pressing plate 62 is lowered, the notch portion 62a of the cloth pressing plate 62 and A certain relative positional relationship is established so that the notch 41 of the lower plate 40 overlaps, and the front end of the cloth pressing plate 62 and the front end of the lower plate 40 are arranged at substantially the same position in the Y-axis direction. To maintain.
For this reason, since the front end portion of the fold line L of the fabric C positioned and arranged by the contact portions 43, 43 of the lower plate 40 is pressed by the front end portion of the fabric pressing plate 62 from above, the fabric C is While maintaining the folded state, the cloth is held while maintaining the position positioned by the contact portions 43, 43 (see FIG. 5B).

Further, since both the lower plate 40 and the first cloth presser means 60 are supported by the cloth moving mechanism 50, the lower plate 40 and the first cloth presser means 60 are used when sewing without using the lower plate 40. The sewing needle 11 is moved and retracted to a predetermined retracted position behind the vertical movement path of the sewing needle 11.
Further, when sewing using the lower plate 40, the contact portions 43, 43 of the lower plate 40 are moved forward to a predetermined sewing position near the vertical movement path of the sewing needle 11, and the vertical movement of the sewing needle 11 is also performed. It is possible to move and position the tip position of the fold line L of the fabric C forward or backward according to the above. As a result, rake stitching is performed on the fabric positioned by the contact portion 43 of the lower plate 40.

In addition, the lower plate 40 has a fabric C placed on the upper surface of the lower plate 40 without positioning the fabric by the contact portions 43, and is solid-stitched (a sewing thread is inserted through the front and back surfaces of the spread fabric so that Can be performed) and counter button stitching (solid stitching and stitching of the counter button at the same time on the back side) can be performed.
That is, the cloth pressing plate 62 is narrower in the X-axis direction than the lower plate 40, and the contact portions 43, 43 of the lower plate 40 and the cloth pressing plate 62 are arranged so as not to overlap. Even if the fabric is placed on the upper surface of the lower plate 40 so as to cover the fabric from above the portion 43, it is possible to hold the fabric by the fabric presser plate 62 from above without placing a support.

(Button holding mechanism)
The button holding mechanism 13 holds the button between the sewing needle 11 and the lower plate 40. The button holding mechanism 13 has a structure in which the outer periphery of the button B is held by two arms, and the button B is arbitrarily moved along the X-axis direction, the Y-axis direction, and the Z-axis direction via each arm. It is possible.
In addition, the tip of each arm can rotate the held button B 90 ° around the X-axis direction in order to perform root winding sewing. 25 (see FIG. 2) is also provided. And it is also possible to hold the button B in the activated state.

(Button movement mechanism)
The button moving mechanism can relatively position the sewing needle 11 and the button B held by the button holding mechanism 13. That is, the button moving mechanism includes a button X-axis motor 31 that moves and positions along the X-axis direction via the button holding mechanism 13 and a button Y-axis motor that moves and positions along the Y-axis direction via the button holding mechanism 13. 32 and a button Z-axis motor 33 that moves and positions along the Z-axis direction via the button holding mechanism 13, and the button is positioned at an arbitrary position on the XY plane via the button holding mechanism 13. Can be positioned. That is, the button B can be arbitrarily positioned with respect to the sewing needle 11. Further, the buttons can be raised and lowered via the button holding mechanism 13.

  Note that the sewing needle 11 and the held button B can be relatively positioned at an arbitrary position on the XY plane by the button moving mechanism and the needle swing of the vertical movement mechanism of the sewing needle 11 described above. The sewing needle 11 and the fabric held by the lower plate 40 or the tongue 15 are relatively positioned at an arbitrary position on the XY plane by the cloth movement mechanism 50 and the needle swing of the vertical movement mechanism of the sewing needle 11 described above. The button moving mechanism, the vertical moving mechanism, and the cloth moving mechanism 50 constitute a moving mechanism.

(Looper and interlocking means)
A looper is disposed below the sewing needle 11 and in the sewing machine bed 103. This looper is driven to rotate in synchronization with the vertical movement of the sewing needle 11 by a looper shaft (not shown) disposed substantially along the Y-axis direction in the sewing machine bed 103 and is counterclockwise when viewed from the rear. It is designed to rotate around.
Such a looper is provided with a claw for catching the sewing thread T from the sewing needle 11 at a position outside the rotation radius. When the sewing needle 11 is close to the bottom dead center position, the phase of the looper claw is adjusted so as to pass through the top dead center in the rotation, and the sewing has entered below the lower plate 40. The sewing thread T is captured from the needle 11. Then, the looper captures the thread from the sewing needle newly lowered in the next rotation, and inserts the loop of the sewing thread formed by capturing the previous time to form a seam of the single thread chain stitch. .
Note that a needle hole for inserting the sewing needle 11 into the sewing machine bed 103 is provided at the lowering position of the sewing needle 11 on the upper surface of the sewing bed 103, but the illustration is omitted.

(Control system for sewing machine with buttons)
Next, a control system of the button sewing machine 100 will be described. The button sewing machine 100 is provided with an operation control means 80 that includes a memory 82 that stores various programs for performing various controls, which will be described later, and a CPU 81 that executes the various programs and executes various controls and processes. Each part is connected to the operation control means 80.
That is, the operation control unit 80 is connected to the operation panel 83, the power switch 84, the temporary stop switch 86, and the start pedal 89. Further, an external memory 87 which is a portable non-volatile flash memory is connected to the operation control means 80 via an operation panel 83.
Further, the operation control means 80 includes a sewing machine motor 21, a button X-axis motor 31, a button Y-axis motor 32, a button Z-axis motor 33, a cloth Y-axis motor 34, and a needle swinging motor 35 as control targets, which are not shown. And via a driver circuit, it is possible to control rotation start, stop, rotation speed, rotation angle amount, and the like.
Further, the operation control means 80 includes an electromagnetic for individually driving the first cloth presser cylinder 63, the second cloth presser cylinder 68, the rotary cylinder 25, the thread trimming cylinder 26, and the tongue cylinder 28, which are various air cylinders. The valve 88 is connected via an interface and a driver circuit (not shown), and drive control of each cylinder 63, 25, 26, 28 is possible.

  On the operation panel 83, the operator of the sewing machine uses the tongue to rake without root winding sewing, to use the tongue with rake root winding, to use the counter button with the lower plate, with the bottom plate, with the bottom plate, with the lower plate Selects the type of button-attached sewing method from rake stitching, etc., the number of button threading holes and button types, various parameters according to the selected button-attached sewing, the number of sewing needles, the shape of the sewing (for example, four Input buttons for input such as whether to form two seams that intersect diagonally or form two seams aligned in parallel to a button having two threading holes) And a display panel for displaying the sewing conditions and the sewing status.

Various setting information input from the input button of the operation panel 83 is recorded in the external memory 87 as sewing data.
The external memory 87 stores a plurality of sewing data necessary for button sewing. The sewing data can be input to the external memory 87 from another button-attached sewing machine or an external data input device in addition to the operation panel 83 described above.

  The power switch 84 is an ON / OFF switch for turning on the button sewing machine 100. The temporary stop switch 86 is a switch for temporarily stopping after the start of sewing. The start pedal 89 is a sewing instruction input means for instructing the start of sewing according to the present invention, and is a foot pedal that outputs a sewing machine start signal and starts driving the sewing machine motor 21 when the main power is on.

(Operation control by operation control means)
The operation control performed when the CPU 81 performs rake stitching using the lower plate according to the control program in the memory 82 will be described with reference to FIGS. FIG. 6 is an explanation of the work performed on the lower thread C before setting the fabric C to be rake-sewn by using the lower plate on the lower plate 40 in the order of FIGS. 6 (A) to 6 (C). It is. FIG. 7 is a diagram for explaining the operation for performing rake sewing. FIG. 7 (A) shows a case where a needle drop is applied to the tip of the fold line L of the fabric C, and FIG. 7 (B) shows the crease line L of the fabric C. FIG. 7C shows a state after the completion of sewing.

The rake stitching using the lower plate is performed when, for example, the button B is sewn on the surface side of the outer surface C1 by inserting the sewing thread only into the outer surface C1 with respect to the fabric C as the sewing material composed of the outer surface C1 and the lining C2. Is the target.
First, a description will be given of an artificial work performed before the rake sewing operation control using the lower plate.
As shown in FIG. 6A, the fabric C as described above is partially sewn with the outer fabric C1 and the lining C2. A symbol P indicates a sewing position which is a target position for button sewing.
As shown in FIG. 6B, the fabric C has a bag shape between the seams, and the outer fabric C1 and the lining C2 can be separated from each other.
Then, as shown in FIG. 6 (B), only the outer surface C1 is folded along the crease L passing through the sewing position P while separating the outer surface C1 and the lining C2.

Then, the stitch position P of the crease L of the folded outer material C1 is the center position in the X-axis direction of the notch 41 of the lower plate 40, and the crease L of the outer material C1 is directed rearward from the front. The tip is positioned by moving it in the rearward direction so as to contact each of the contact portions 43, 43 (see FIG. 5A).
Up to this point, the operation is performed manually by the operator, and when the start pedal 89 is depressed, the operation control by the operation control means 80 is started.

That is, when the input of the start pedal 89 is detected, the CPU 81 controls the electromagnetic valve 88 to drive the first cloth presser cylinder 63 to lower the cloth presser plate 62 so that the outer surface C1 is folded and the crease L. Is held so as to maintain the position positioned on the contact portions 43, 43 (see FIG. 5B).
Then, the CPU 81 sets the cloth movement mechanism so that the initial position of the rake sewing using the lower plate, that is, the positioning line by the contact portions 43 and 43 and the sewing needle 11 are the same position or the close position in the Y-axis direction. The movement positioning control of the lower plate 40 and the first cloth pressing means 60 by 50 is performed.

On the other hand, the CPU 81 controls the operation of positioning the threading hole where the needle drop of the first needle of the button B is to be performed at the needle drop position of the sewing needle 11 by the button X-axis motor 31 and the button Y-axis motor 32.
Further, the CPU 81 performs operation control for moving the button B held by the button Z-axis motor 33 to the position immediately above the lower plate 40 (see FIG. 7A). At this time, the held button B has a height that is closest to the arm of the button holding mechanism 13 within a range in which the arm does not interfere with the lower plate 40 and the cloth presser plate 62.

Next, the CPU 81 drives the sewing machine motor 21 and adjusts the sewing needle 11 in the vertical movement cycle by the button Y-axis motor 32 based on setting data such as the arrangement of the threading holes of the button B input in advance. Positioning is performed in the Y-axis direction so that the front threading hole and the rear threading hole are located directly below the sewing needle 11.
In addition, when the threading holes of the button B are also provided on the left and right like the four holes, the CPU 81 sets the button X axis based on the setting data of the button B in accordance with the driving of the sewing machine motor 21. With the cooperation of the motor 32 and the needle swinging motor 35, the front threading hole and the rear threading hole are alternately directly below the sewing needle 11 in accordance with the vertical movement cycle of the sewing needle 11. Position in the axial direction.

Further, the CPU 81 controls the cloth Y-axis motor 34 in accordance with the vertical movement period of the sewing needle 11 so that the tip position of the fold line L of the fabric C held by the lower plate 40 is higher than the needle drop position of the sewing needle 11. Positioning is alternately performed in the Y-axis direction at a rear position (state shown in FIG. 7A) and a front position (state shown in FIG. 7B).
Thereby, the needle drop for the fabric C (state shown in FIG. 7A) and the empty drop for the front side (rear) of the fabric C (state shown in FIG. 7B) are alternately performed.
The distance M1 from the tip of the fold line L of the fabric C to the needle drop position in the fabric C can be set by the operation panel 83 as setting means and stored in the external memory 87 as storage means. It has become.
Further, the distance M2 from the tip of the fold line L of the fabric C to the needle drop position when the fabric C is dropped is set by the operation panel 83 and can be stored in the external memory 87. It has become.
That is, the CPU 81 refers to the set distances M1 and M2 and determines the position of the front surface of the contact portion 43 of the lower plate 40 (the contact position of the crease L of the fabric C) in accordance with the vertical movement cycle of the sewing needle 11. In addition, the movement control of the cloth Y feed motor is performed so as to alternately and repeatedly perform the backward movement of the distance M1 and the forward movement of the distance M2 from the front surface position.

The operation control for the sewing machine motor 21, the button X-axis motor 31, the button Y-axis motor 32, the button Z-axis motor 33, the needle swing motor 35, and the cloth Y feed motor 34 is repeated for the number of stitches set for button sewing. Button sewing is completed.
When the button B has four holes, the left and right threading holes are sewn by the number of stitches set for the number of stitches.

After the sewing, the CPU 81 drives the first cloth presser cylinder 63 to raise the cloth presser plate 62 and release the cloth C from being held.
As a result, when the outer surface C1 is expanded from the folded state to the original state, the outer surface C1 and the lining C2 come into contact again, and the sewing thread T sewing the button B penetrates only the outer surface C1. The sewing thread T does not appear on the surface of the lining C2.
Further, as shown in FIG. 7 (C), the passing width H of the sewing thread T of the outer cloth C1 after button sewing can be about twice the above-mentioned distance M1 (the thickness of the cloth is d). 2 × M1−d <H <2 × M1).

(Effect of embodiment)
In the button sewing machine 100, the front end portion of the crease L of the outer cover C1 is formed by pulling the outer cover C1 away from the lining C2 and folding the lower cover 40 on the cloth C in which the two cloths composed of the outer cover C1 and the lining C2 are stitched together. It has the contact part 43 and 43 to position, and has the 1st holding | suppressing means 60 hold | maintained in the folding state of the surface C1.
For this reason, it becomes possible to fold and hold only the outer surface C1 without interposing the lining C2 between the folded outer material C1 and the outer material C1.
Therefore, unlike the case of rake sewing using the tongue, which folds the outer surface C1 and the lining C2 while overlapping the outer surface C1 and the lining C2 at the front end portion of the tongue 15 and sews only the outer surface C1, when the rake sewing using the lower plate is performed, It becomes possible to set the distance M1 from the tip of the crease L of C1 to the needle drop position larger than the thickness d of the fabric.
As a result, the passage width H (see FIG. 7C) of the sewing thread T of the outer material C1 can be made wider, and the wobbling of the button B after sewing can be reduced and stable sewing can be performed. It becomes.
Further, the passage width H of the sewing thread T on the outer surface C1 can be widened, and at least only the outer surface C1 is pierced and sewn, so that the button B can be firmly sewn to the sewing product. Become.

(Other)
In addition, each contact part 43 and 43 of the lower board 40 has a structure which positions to the front-end | tip part of the crease | fold L of the fabric C about the Y-axis direction.
This is because the crease L of the fabric C is set along the X-axis direction at the time of rake sewing (see FIG. 5), and the fabric C is alternately moved back and forth along the Y-axis direction orthogonal thereto. This is due to the fact that
That is, since it is necessary to position the front end portion of the fold line L of the fabric C with respect to the relative alternating movement direction (Y-axis direction) of the sewing needle 11 and the fabric C in the rake stitch, the contact portions 43 and 43 are The tip of the fold line L of the fabric C is only positioned in the Y-axis direction.
Accordingly, when the sewing machine 11 and the fabric C are used in rake stitches in which the relative alternate moving direction of the sewing needle 11 is different from that in the Y-axis direction, the leading end of the fold line L of the fabric C is positioned by the contact portions 43 and 43. The direction to be performed is not limited to the Y-axis direction, and it is desirable to have a structure in which positioning is performed in the relative alternating movement direction of the sewing needle 11 and the fabric C in rake sewing.

  For example, when the needle swinging direction of the sewing needle 11 performed relative to the fabric C for rake sewing is performed along the X-axis direction other than the Y-axis direction, for example, it is formed on the lower plate 40. It is desirable that the contact portion 43 has a structure in which the distal end portion of the fold line L of the fabric C is brought into contact with the Y axis direction orthogonal to the needle swing and the distal end portion is positioned in the X axis direction.

Alternatively, in the above embodiment, the fold L of the fabric C is brought into contact with the contact portion 43 of the lower plate 40 from the front to the rear. However, the fold L of the fabric C from the rear to the front. Needless to say, it is also possible to adopt a configuration in which the abutment is made to contact.
In this case, it is desirable to dispose the sewing machine bed 103 further forward.

Moreover, although the case where scooping is performed with the lower plate 40 is illustrated, it goes without saying that the lower plate 40 may be used for solid stitching or sewing with a counter button.
In that case, the cloth C is placed on the upper surface of the lower plate 40 so as to cover the respective abutments 43 without being folded, and sewing is performed.

1 is an overall perspective view of a sewing machine with a button as an embodiment of the invention. It is a block diagram which shows the main structures of a sewing machine with a button. It is a principal part perspective view which shows the whole sewing machine arm. It is an expansion perspective view which shows the structure of the upper surface in the extending direction intermediate position of a sewing machine arm. FIGS. 5A and 5B are diagrams illustrating a use operation in plan view of the lower plate. FIG. 5A illustrates a state before the fabric is set, and FIG. 5B illustrates a state after the fabric is set and held. . FIG. 6 is an explanation of the work performed on the lower thread C before setting the fabric C to be rake-sewn by using the lower plate on the lower plate 40 in the order of FIGS. 6 (A) to 6 (C). It is. FIG. 7 is an explanatory view of the operation for performing rake sewing. FIG. 7 (A) shows a case where a needle drop is performed at the tip of the fold line L of the fabric C, and FIG. 7 (B) is a front side of the fold line L of the fabric C. FIG. 7C shows a state after the completion of sewing. FIGS. 8A and 8B are operation explanatory views for performing rake sewing with a conventional sewing machine. FIG. 8A shows a hand movement operation during sewing, and FIG. 8B shows a state after completion of sewing.

Explanation of symbols

11 Sewing Needle 13 Button Holding Mechanism 15 Tung 21 Sewing Motor 31 Button X Axis Motor 32 Button Y Axis Motor 33 Button Z Axis Motor 34 Cloth Y Axis Motor 35 Needle Swing Motor 40 Lower Plate 43 Abutment 50 Cloth Movement Mechanism 60 First Cloth pressing means 62 cloth pressing plate 63 first cloth pressing cylinder 65 second cloth pressing means 67 cloth holding member 68 second cloth pressing cylinder 80 operation control means 81 CPU
82 Memory 83 Operation panel 87 External memory 100 Button sewing machine B Button C Fabric C1 Outer fabric C2 Lining L Crease

Claims (2)

A button holding mechanism that holds a button under a sewing needle that is driven by a sewing machine motor to move up and down;
A lower plate for placing the workpiece under the held button;
A moving mechanism for relatively moving the held button, the workpiece placed on the lower plate, and the sewing needle along a plane intersecting the vertical movement direction of the sewing needle;
A looper that captures the sewing thread from the lowered sewing needle to form a loop;
An operation control means for performing button sewing on the sewing product while relatively moving the sewing needle, the button, and the sewing product that move up and down by driving and controlling the sewing machine motor and the moving mechanism;
In a sewing machine with a button,
At the front end portion of the lower plate, the sewing material made of fabric folded along the fold passing through the button sewing position can be positioned with respect to the sewing needle by bringing the tip of the fold into contact. Abutting portions provided on the left and right sides across the vertical movement path of the sewing needle;
A cloth pressing means for pressing a sewing product having a crease in contact with the contact portion,
The button control sewing machine, wherein the operation control means controls the operation of the sewing machine motor and the moving mechanism so as to alternately perform needle drop before and after the fold portion of the positioned sewing product. A button holding mechanism that holds a button under a sewing needle that is driven by a sewing machine motor to move up and down;
A lower plate for placing the workpiece under the held button;
A moving mechanism for relatively moving the held button, the workpiece placed on the lower plate, and the sewing needle along a plane intersecting the vertical movement direction of the sewing needle;
A looper that captures the sewing thread from the lowered sewing needle to form a loop;
An operation control means for performing button sewing on the sewing product while relatively moving the sewing needle, the button, and the sewing product that move up and down by driving and controlling the sewing machine motor and the moving mechanism;
In the button attaching method using the button attaching sewing machine provided with
Fold a part of the fabric that is sewn together with multiple pieces of fabric together and fold it along the crease that passes through the button sewing position.
Place the sewing product on the lower plate while maintaining the folded state,
A buttoning method, wherein the operation control means controls the operation of the sewing machine motor and the moving mechanism so that needle dropping is alternately performed before and after the fold portion of the positioned sewing product.

Images