JPH02198584A - Button sewing machine - Google Patents

Abstract

PURPOSE:To enable buttons to be surely efficiently sewed on by holding the button being sewed at three points, i.e. both sides of periphery of the button and the central portion of the button surface with the and of a pair of sandwiching pieces and button holding tool. CONSTITUTION:A shank button 6 is sandwiched by a pair of left and right sandwiching pieces 14A, 14B from both sides of the periphery of the button and then a button holding tool 34 is operated to cause the distal end to abut against the center of surface of the shank button 6 and press forcibly the back of a pressure plate piece 12b of a cloth guide 12 together with a button holder 14, so that both side portions of the back 6A of shank button 6 are pressed against the first receiving surfaces 14a, 14b of a pair of sandwiching pieces 14A, 14B to regulate the position of set shank button 6 relative to the button holder 14, while both the button 6 and holder 14 can be fixedly held to a predetermined button attaching position without any play of the button holder 14. Thus, any form and kind of button can be held in a predetermined position and surely satisfactorily sewed on.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides buttons parallel to the back side of the back surface, such as the front buttons of men's and women's jackets and vests, and the gold buttons of student uniforms. This sewing machine is used to NR shank buttons and marble buttons with holes into various sewn items.In detail, the sewing machine is used to sew buttons to fabrics through root threads, and to sew buttons to the root threads of rooted buttons. This invention relates to a button sewing machine used when neck wrapping is performed successively and sequentially in time.

[Conventional technology] Unlike flat buttons, shank buttons and marble buttons have a beautiful finish because the sewing thread is not exposed on the button or the surface of the fabric. On the other hand, by applying neck wrapping, not only does the sewing strength of the button increase, but also the button can be firmly held in a state where it is suspended from the fabric, making it easier to engage the button hole. It has the following advantages.

By the way, in this type of button sewing machine, both when sewing the button and when wrapping the button, the button hole provided on the back side of the button passes through it vertically, that is, the button is placed in a position perpendicular to the horizontal plane. need to be held.

For this reason, conventional sewing machines of this type have used a button holder that includes a pair of left and right gripping pieces that grip the circumference of the button from both sides when the button is in a standing position.

[Problem to be solved by the invention] However, with the button holder of the conventional button sewing machine, which is configured to simply hold the circumferential part of the button from both sides when the button is in a standing position, the button is held very unstablely. However, when vibrations are applied, the buttons tend to tilt or move back and forth.Furthermore, the button holder has some play in order to make the holder itself move smoothly. The backlash of the button holder tends to increase the above-mentioned inclination amount and front-to-back displacement, and as a result, there is a drawback that button attachment errors and button attachment defects are more likely to occur.

In addition, the stability of holding by the holder varies depending on the button type, which has different button thickness and shank protrusion.To improve this, multiple types of button holders are used depending on the button type. It was also considered to prepare and replace these, but in this case,
It is necessary to prepare multiple types of button holders for one sewing machine, which not only increases costs, but also requires the complicated and troublesome work of replacing the holders each time depending on the type of button, which reduces the button attachment process. This was also a cause of decreased efficiency.

This invention was made in view of the above-mentioned circumstances, and it is possible to securely hold many types of buttons in predetermined postures while using a single button holder.

To provide a button sewing machine capable of performing accurate and efficient button sewing.

[Means for Solving the Problems] In order to achieve the above object, the button sewing machine according to the present invention has a sewing needle that reciprocates up and down at a fixed position, and a sewing needle that moves horizontally in the left and right directions along the horizontal plane of the folded fabric. A fabric guide is provided on the fabric guide to guide movement, and has a cutout hole at the tip through which the sewing needle passes and moves. A fabric holder that is fixed close to the vertical movement path of the fabric holder, and a pair of clamps that sandwich the button from both sides of its periphery with button holes provided on the back side facing the fabric holder vertically penetrating the fabric holder. a button holder having a button holder; a drive device that reciprocates the button holder and the fabric holder in two-dimensional directions orthogonal to each other in a horizontal plane; The present invention is characterized by comprising a button presser that can press and fix the button and the button holder against the fabric guide side.

Further, the pair of left and right holding pieces of the button holder in the button sewing machine described above have a first receiving surface that comes into contact with the back surface of the button and a second receiving surface that comes into contact with the peripheral edge of the button,
The second receiving surface is formed into an inclined surface that extends closer to the center of the button as the distance from the first receiving surface increases.

Further, the button sewing machine described above is provided with a sewing speed variable means that can automatically change the sewing speed at least at the start of sewing to a lower sewing speed than the sewing speed during steady sewing.

[Function] According to the present invention, the fabric is folded in two, a fabric holder is inserted between the two-folded fabric, and the button sewing area of the two-folded fabric is placed close to the vertical movement path of the sewing needle. While fixed.

Drop the button between the pair of clamping pieces of the button holder,
By moving these pair of clamping pieces close to each other, the button is clamped from both sides of its periphery and held in a standing position with the button hole on the back side vertically penetrating the button. Next, operate the button presser, bring its tip into contact with the center of the surface of the button, and press it against the fabric guide to press the button and button holder against the fabric guide to initialize the button. Even if the button holder is tilted, it can be corrected and fixed in the specified position relative to the button holder, and the button holder itself has a slight play to ensure smooth movement. It can be fixed in a predetermined posture relative to the object. In this way, the fabric and buttons are set in a predetermined button attaching position.

In the above state, by operating the sewing machine, the sewing needle is reciprocated up and down, and the button holder and fabric holder are reciprocated by a set amount in one of the two-dimensional directions orthogonal to each other in the horizontal plane. First, stitching is performed between the folded part of the fabric and the button hole. Upon completion of the stitching, the button holder ladle and the fabric holder are moved to the other of the two-dimensional directions perpendicular to each other in the horizontal plane. By reciprocating the sewing machine by a set amount, the sewing thread is wrapped around the roots.

In addition, if the sewing speed at least at the start of sewing opening for root stitching and neck wrapping is configured to be automatically changed to a lower speed than the speed for regular sewing, it would be possible to Even if the material is thin, it prevents the thread from falling down the fabric due to inertia.
The yarn ends can be reliably held by the fabric.

[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described based on the drawings.

Fig. 1 is a perspective view of the main part, and in the same figure, (1) is a sewing needle, and this sewing needle (1) is fixed by a lifting mechanism (not shown) provided in the sewing machine arm (11). Move the position up and down. (12) is a fabric guide, and this fabric guide (12) guides the movement of the double-folded fabric (described later) in the left and right directions along the horizontal plane. A notch (12a) that opens toward the rear is formed in the center, and
Button holder pressing plate pieces (12b) are provided to protrude upward from the rear end edges on both sides of the notch (12a). (14) is a button holder with a shank button (6
) on the back side of the shank part (6a) passes through the button hole (θb) vertically. It includes arc-shaped clamping pieces (14A) and (14B). As shown in FIG. 3, the pair of left and right holding pieces (14A) and (14B) in this button holder (14) have a first receiving surface (14a) that comes into contact with the back surface (6A) of the shank button (6). ), (+4b) and the second receiving surface (14al
), (14bl), and a second receiving surface (1
4al), (14bl) is the first receiving surface (14a),
The button (14b) is formed into an inclined surface that extends closer to the center of the button (8) as it moves away from the button (14b). This button holder (14) is kept in a constant position so as to hold the shank button (6) in the above-mentioned standing position during both rooting and root wrapping, but the thread is cut by a thread cutting knife (not shown). Only when the cylinder for button holder rotation (
15), the shank button (6) is tilted via the connecting rods (16), (17) and the stopper (18) so that it is inclined at about 45 degrees with respect to the horizontal plane.

(18) is a fabric holder that folds the fabric (8) to be fully fastened to the shank button (6) in half, and inserts it in the middle of the folded fabric (8) to hold the button sewing area of the fabric (8). It is fixed close to the vertical M movement path of the sewing needle (1). (20) is a cylinder for rotating the fabric holder, and when this cylinder (20) contracts and expands, the connecting rods (21), (
The fabric holder (19) is configured to be switchable between a fixed state and a released state with respect to the fabric (8) via a shaft (23) and a bracket (24). ) at the tip of the fabric guide (12)
There is a notch (19a) at a location corresponding to the notch (12a).
) is formed.

(25) is a dough presser, (2B) is a dough presser operation cylinder, and this dough presser (25) is connected to the dough holder (19).
This fabric (
8) is pressed toward the front (f) to prevent the fabric (8) from bending as shown in FIG.

(27) is a movable table, and this movable table (27)
are two stepping motors (28) and (29) which will be described later.
) and timing bell) (38), (39) in two-dimensional directions perpendicular to each other in the horizontal plane, that is, X-Y
It is configured to move reciprocally in the axial direction. (
30) and (3) are a pair of left and right fabric holder arms,
It is fixed to both the left and right sides of the movable table (27). The dough guide (12) is fixedly connected between the pair of dough holder arms (30) and (31), and the shaft (2) is connected to one dough holder arm (30).
3) is supported. (32) is a button holder arm, which is attached to the movable table (33) via an arm joint (33).
27).

With the above configuration, the button holder (14) and fabric holder (19) are configured to be able to reciprocate in the X-Y axis directions via the movable table (27).

(34) is a button holder, and (35) is a button holder operating cylinder, which is fixed to the front end of the center of the movable table (27) in the width direction via a bracket (3B). ) comes into contact with the central part of the surface of the shank button (6) held by the button holder (14), and both sides of the shank button (6) in the radial direction are moved as shown in FIG. a pair of left and right holding pieces (14A), a first receiving surface (14a) of (14B);
(14b) to define the button set posture, and press the entire button holder (14) against the back of the pressing plate piece (12b) in the fabric guide (12), so that the button holder (14) It is configured to be fixed in a predetermined posture with respect to the fabric guide (12) regardless of the movement play.

Figure 4 shows the control system of the button sewing machine with the above configuration.
In the same figure, (40) is a microcomputer unit (hereinafter referred to as the microcomputer unit) that controls a series of sequence operations such as root sewing and neck wrapping sewing for attaching buttons, sewing speed, etc. It consists of a programmable program memory (40A), a data memory (4oB) capable of accessing various data, and a central processing unit (hereinafter referred to as CPU) (400).

(41) to (47) are the first to seventh setting devices arranged on the operation panel (55), and are connected to the microcomputer unit (40) through the interface circuit (48), respectively.
are connected to the first to seventh setting devices (41) to
(47) performs the following settings.

As shown in FIG. 5, the first setting device (41) is for setting the position from which button attachment should start on the fabric (8) at the origin position 2i (X=0) on the X axis; In other words, it is used to set the amount of movement (Δyl) of the movable table (27) in the Y-axis direction from the edge of the fabric (8) to the first stitch position (A), and the second setting device (42) is the position ii of the first stitch above! i (A) to the position CB of the first stitch during the neck wrapping process (Δy2) of the movable table (27) in the Y-axis direction, and these first and second setting devices By (41) and (42), the origin position of the movable table (27) is adjusted to correspond to the thickness of the shank button (6), the amount of protrusion of the shank portion (8a), etc., respectively.

The third setting device (43) is at the position of the first stitch ffl (A).
From force thread position i? ! This is to set the amount of movement (Δ!3) of the movable table (27) in the Y-axis direction up to (C),
The fourth setting device (44) is for setting the unit movement amount (y) of the movable table (27) in the Y-axis direction during the root wrapping process.The fifth setting device (45) is for setting the unit movement amount (y) of the movable table (27) in the Y-axis direction during the root wrapping process. The left and right swing width, that is, the unit movement amount (p) of the movable table (27) in the X-axis direction is set.

The sixth setter (4B) sets the number of stitches (Ml) during the rooting process of the button (6), and the seventh setter (47) sets the number of stitches (N2) during the neck wrapping process. be.

The above-mentioned microcomputer unit) (40) is the above-mentioned sixth setting device (
It has an up/down counter (not shown) that subtracts the number of hand movements (N1) set by 46), and when the count value of this up/down counter reaches zero, the CPU
(40G) to the motor driver (5B) via the I10 boat (51).
) stops the operation of the stepping motor (29).

(50 is a sensor that detects that the sewing needle (1) is at the top dead center. This sensor (54) detects the top dead center position of the sewing needle (1) when the above-mentioned number of stitches (Ml) becomes zero. Then, the detection signal (S2) is inputted to the microcomputer unit (40) via the interface circuit (53). A reed switch or the like is used as this sensor (50), and based on the logical OR operation of its detection signal (S2) and the rooting process end signal (Sl), the two motors are connected via the I10 port (51). Driver (5B)
, (52) are output with the actuation signal (S3), respectively.
The two stepping motors (28) and (29) are operated simultaneously to move the movable table (27) to the second setting device (
42) and the amount (Δ!2) set by the fifth setter (4
This movable table (27) is moved in the X-Y direction by half (p/2) of ff1(p) set by 5).
moves to the position (B) of the first stitch during the neck wrapping process.

(50) is a sensor, and the movable table (27) is at the position i of the first stitch during the neck wrapping process. t (B) is detected. A reed switch or the like is used as this sensor (50), and its detection signal (S4) is inputted to the microcomputer unit (40) via an interface circuit (53).

Motor driver (52) via I10 boat (51)
Outputs the operation signal (S5) to the stepping motor (
28), thereby causing the movable table (27) to adjust the setting lit by the fifth setting device (45) until the number of hand movement (N2) set by the seventh setting device (47) becomes zero.
At (p), it is reciprocated in the X-axis direction.

In addition, in the program memory (4OA) in the microcomputer unit (40), the sewing speed (Vl) of the first stitch and the second The sewing speed of the stitch (v2) and the sewing speed of the N stitch (V4) are determined by the sewing speed (
v3), the first mode is set to have the relationship of Vl<V2=V4<V3, and the second mode is set to a constant high-speed sewing speed (v3) from the start of sewing to the end of sewing. A speed program is stored in advance.

Next, the operation of the above configuration will be explained with reference to the flowchart shown in FIG.

Button holder (14) as shown in Figures 1 and 2
Next, the pair of clamping pieces (14A) and (14B) are used to clamp the shank button (6) from both sides of its circumference, and the fabric (8) is folded in half and set in the fabric holder (19). By depressing a pedal (not shown), the cylinder (20) is extended to press and fix the fabric holder (19) together with the folded fabric (8) on the upper surface of the fabric guide (12), and by the extension of the cylinder (26), The dough presser (26) presses the top surface of the folded dough (8) from above to prevent the dough (8) from bending.

In this state, if you turn on the button switch (not shown),
Via the first to seventh setting devices (41) to (47).

Data that has been input into the data memory (40B) in advance,
In other words, (Δyl), (Δy2), (Δy
3) (y), (p), (old), (N2) are read into the microcomputer unit (40) (step 100), and based on these data, the CPU (40G) moves with respect to the movable table (27). Create data (step 101).

Next, Microcomputer Units) (40) to Ilo, t?
- Based on the actuation signal (S5) output to the motor driver (56) via the movable table (51),
7) is moved to the first stitch sewing position (A) via the motor (29) (step 102), and then,
The sewing machine starts operating, but at this time, it is determined whether the first mode or the second mode has been selected among the speed programs stored in the program memory (40A) (step 103). If the mode is selected, ■Start the operation of the rooting process at a speed of 1 (Step 104), and if the second mode is selected, ■Start the operation of the rooting process at a speed of 3 (Step 104). 105).

Then, it is determined whether or not the table movement data created in step 101 has been completed (step 10B).
), when all the data has been completed, the operation of the sewing machine is stopped (step 107), and the movable table (2
7) is returned to the origin position (step 108) to complete the rooting process.

On the other hand, in step 106, if the table movement data has not yet been completed, it is determined whether or not there is a table movement signal (step 109), and when the table movement signal is present and the selected speed program is in the first mode. In step 110), it is determined whether or not a speed change is necessary upon completion of sewing the first stitch and completion of sewing the second stitch. While changing the speed to V4 (step txt), the movable table (27) is moved by a set amount in the Y-axis direction to root one stitch (step 112).
.

When the rooting for one stitch is completed, the next table movement data is changed (step +13).
Returning to step 10B, rooting is performed using a predetermined number of needle movements (old).

At -I-, the rooting process for the predetermined number of needle movements (N1) is completed, and the completion signal (Sl) causes the stepping motor (2
9), and based on the OR operation of the rooting process end signal (sl) and the detection signal (S2) of the top dead center position of the sewing needle (1) by the sensor (54),
Both motor drivers (5B) from I10 boat (51)
, (52) causes both stepping motors (2B) and (29) to operate simultaneously to move the movable table (27) to the position (B) of the first neck wrapping stitch. In this way, the sensor (50) detects that the movable table (27) has moved to the position 24 (B) of the first neck wrapping stitch, and the detection signal (S4) is input to the microcomputer unit (40). (51)
An actuation signal (S5) is output to the motor driver (52) through. As a result, the movable table (27) starts reciprocating in the X-axis direction by the stepping motor (28). In other words, the root wrapping process begins. This root wrapping process differs from the rooting process only in the number of needle movements, and the other operations are the same as steps 103 to 113 in the rooting process, so a detailed explanation will be omitted.

Through the series of operations described above, it is possible to attach a button in which the shank button (6) is firmly held on the fabric (8) while floating above the fabric (8), as shown in Figure 8. In such a button attaching work, the shank button (6) is held by a pair of left and right holding pieces (14A).
, (14B), it is extremely unstable if the shank button (6) is only held from both sides of its periphery, and the standing posture of the shank button (6) may be tilted or displaced back and forth due to vibrations, etc. In addition, the button holder (14) Due to the presence of backlash to ensure smooth operation, the amount of inclination and displacement becomes even larger, which tends to result in button attachment errors and button attachment defects. Here, according to the present invention, the shank button (6) is held by a pair of left and right holding pieces (14A).

(14B), hold the button holder (14) from both sides of its periphery and activate the button holder (30) to bring its tip into contact with the center of the surface of the shank button (6), including the button holder (14). Press the pressing plate piece (1) of the fabric guide (12)
2b), the first receiving surfaces (14a) of the pair of clamping pieces (14A) and (14B) hold both sides of the back surface (6A) of the shank button (6).

(14b) to define the set posture of the shank button (6) with respect to the button holder (14), and also to eliminate play in the button holder (14).
) and the holder (10) can both be fixed and held in a predetermined button attaching posture.Thereby, any shape or type of button can be held in a predetermined posture to ensure reliable and good button attaching. be able to.

In addition, for both root wrapping and root wrapping, at least the sewing speed (vl) at the start of tying should be changed to the sewing speed (vl) at the time of steady tying (
By providing a sewing speed variable means that can change the sewing speed to a lower speed than v3), even when the fabric (8) is slippery or has a rough mesh, the thread can be pulled out from the bottom of the fabric due to inertia. It prevents it from being put away, and the fabric (8
) The end of the thread can be sewn into the fabric and retained more reliably, regardless of the material. Furthermore, by increasing the sewing speed during steady fastening, the efficiency of button attachment as a whole can be kept sufficiently high.

Although the above embodiment has been described with reference to a shank button as an object to be sewn, the same effect as in the above embodiment can be obtained even if the present invention is suitable for sewing a marble button as shown in FIG. 9.

[Effects of the Invention] As described above, according to the present invention, a button that needs to be held in a standing position during button attachment work can be held around the button by the cooperation of a pair of clamping pieces and a button holder. It can be held at three points: on both sides of the button and at the center of the button surface, so even if the initial setting position by the operator is tilted or shifted back and forth, the disturbance can be corrected. This allows the button holder to reliably hold the button in a predetermined orientation. In addition, the button holder itself can be pressed against the fabric guide side to avoid any adverse effects due to backlash during its operation.

Therefore, there is no need to prepare many button holders corresponding to the types of buttons, and then use them interchangeably.You can use a single button holder to hold many types of buttons in the desired button attachment position. It is possible to securely hold the button, prevent mistakes or defective products, and perform button attachment with high efficiency.

In addition, by making it possible to automatically change the sewing speed at least at the start of the N lid to a lower speed than the sewing speed during steady sewing, the overall efficiency of button sewing work can be kept sufficiently high.
This prevents the thread from falling out and falling down the fabric due to inertial force, and even if the fabric is slippery or has a rough mesh, the yarn end can be reliably held within the fabric.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of a button sewing machine according to an embodiment of the present invention, Fig. 2 is an enlarged side view of the main parts showing the button setting state, and Fig. 3 is an enlarged view of the main parts in Fig. 2. A schematic cross-sectional view, FIG. 4 is a block diagram showing the main points of the control system,
Fig. 5 is a plan view for explaining the setting of the moving amount of the movable table in the X-axis and Y-axis directions, Fig. 6 is a graph showing the speed program, Fig. 7 is a flowchart explaining the operation, and Fig. 8 is FIG. 9 is a perspective view of a main part showing a state in which button attachment is completed, and FIG. 9 is a perspective view showing another example of a button to be sewn. (1)...Sewing needle, (8)...Shank button, (6
A)... Back side of button, (6a)... Button hole, (
8)...Fabric, (12)...Fabric guide, (14)
...button holder, (14A). (14b) - holding piece, (14a), (14b) - first receiving surface, (14al), (14bl) - second receiving surface,
(19)...Dough holder, (27)...Movable table, (28), (29)...Stepping motor, (34)...Button holder, (40)...Microcomputer unit) , (40A)...Program memory, (40B)...Data memory, (40C)...C
PU, (41) to (47)...first to seventh setting devices. Δy1: xh upper OA-color position η1 1st nail a part i'l-0 amount of movement y: p: 11 (Fun 4111F Teo size-Pull, Gisasasu) 1
And 4 shakuba-! 9! α5 forces θ4 anti-j width diagram N FF Figure 8 diagram b A

Claims (3)

[Claims] (1) A sewing needle that reciprocates up and down at a fixed position, a fabric guide that guides the horizontal movement of the folded fabric in the left and right directions along the horizontal plane, and a notch provided on the fabric guide through which the sewing needle passes. A fabric holder having a hole at its tip and inserted into the middle of the folded fabric to fix the button sewing area of the fabric in close proximity to the vertical movement path of the sewing needle; A button holder is provided with a pair of clamping pieces that clamp the button from both sides of its periphery with buttonholes provided on the sides penetrating vertically; A driving device for reciprocating in the dimensional direction, and a button holder that can press and fix the button and button holder against the fabric guide side by coming into contact with the center of the surface of the button held by the button holder. A button sewing machine characterized by comprising: (2) The pair of clamping pieces of the button holder have a first receiving surface that contacts the back surface of the button and a second receiving surface that contacts the peripheral edge of the button, and the second receiving surface is the first receiving surface that contacts the periphery of the button. 2. The button-sewing machine according to claim 1, wherein the button-sewing machine has an inclined surface that penetrates into the center of the button as it moves away from the receiving surface of the button. (3) The button sewing machine according to claim 1 or 2, further comprising a sewing speed variable means capable of automatically changing at least the sewing speed at the start of sewing to a sewing speed lower than the sewing speed during steady sewing.