JPH02126883A - Root winding buttoning sewing machine - Google Patents

Abstract

PURPOSE:To make the holding of a thread end part and the float at the time of sewing a first stitch certain and enable a proper root winding buttoning by regulating the top end position of a cloth holder in the far and near direction through a root winding first stitch position regulating mechanism according to the thickness and material of the cloth. CONSTITUTION:A button holder 14 has a pair of circular support-ing pieces 14a, 14b elastically holding a button 6 from the both sides of its circumferential part. A cloth holder 19 is inserted in the middle of a twofold cloth 8 on which the button 6 is sewed, and switched to the fixed state and the released state to the cloth 8 through connection beams 20, 22, a shaft 23, and a blanket 24. The button holder 14 and the cloth holder 19 are formed in such a manner that they can reciprocate periodically in the X-Y axial direction through a movable table 27. By rotating a stopper regulating tool 36 in the extended state of a cylinder 20 for rotating the cloth holder, the position to the vertically moving surface of a needle 1 in a notched part 19a formed in the top end part of the cloth holder 19 is moved in the longitudinal direction y-y to regulate the root winding first stitch position.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is applicable to various sewn products such as front buttons of men's and women's jackets and vests, buttons for inner pockets, buttons for screw pockets of pants, etc. This invention relates to a sewing machine used for sewing buttons, and particularly to a neck-wrapping button sewing machine used for neck-wrapping buttons that have been attached to fabric via root threads.

[Conventional technology] When the root thread used to sew buttons onto fabric is wrapped, it not only increases the sewing strength of the button, but also securely holds the button in a suspended state relative to the fabric. This has advantages such as ease of engagement with buttonholes.

By the way, a conventional neck-wrapping button sewing machine of this kind has a configuration as shown in FIGS. 11(a) and 11(b).

In FIGS. 11(a) and 11(b), (1) is a sewing needle, and this sewing needle (1) reciprocates up and down at a fixed position as shown by the imaginary line in the same figure. (2) is a fabric guide.

(3) and (4) are a pair of guide plates, and these guide plates (3) and (4) are brought into sliding contact with the fabric guide (2) and are driven by arrows (a to b) through a drive mechanism (not shown). ) and (C to d) directions so that the relative spacing can be adjusted on a feed plate (5) that is provided to be able to reciprocate synchronously. (6) is a button, which is sewn to the fabric (8) via the root thread (7). (3A) and (4A) are cut grooves formed in the guide plates (:l) and (4) downward from their upper edges;
) by engaging the root thread (7) in the inner surface of the button (6) to bring the back surface of the button (6) into contact with the inner surface of one of the guide plates (4), and
Fold the fabric (8) in half, bring it into contact with the outer surface of the other guide plate (3), and extend the root thread (7) along a substantially horizontal plane between the pair of guide plates (3) and (4). Obtain the neck wrapping sewing position. In other words, a pair of guide plates (3)
(4) Also works as a button holder when sewing neck wraps.

Next, the operation of the above configuration will be explained.

As mentioned above, the sewing machine is started with the sewing machine set in the neck wrapping sewing position in which the thread (7) is passed along a substantially horizontal plane between the pair of guide plates (3) and (4). By reciprocating the sewing needle (1) up and down and simultaneously reciprocating the feed plate (5) in the directions of arrows (a-b) and (c-d), )～(
As shown in N), the neck wrapping thread (9) is wrapped around the root thread (7) while moving by a predetermined step for each stitch. In such neck wrapping sewing, the sewing position of the first stitch is shown as (0) in Fig. 12, and the root thread (7)
It was set near the base of the.

[Problem to be solved by the invention] The conventional neck wrapping button sewing machine was configured as shown below, so that the sewing position of the first stitch when sewing the neck wrapping was determined by the presence of the guide plate (4). It was restricted near the base of the root thread (7). Therefore, the pull-out resistance against the root thread of the first stitch is small, and the root thread (7)
As the end of the thread that has been inserted returns to the top of the sewing needle (1), it is pulled out upwards and does not remain below the root thread (7), so the thread scooping by the louver at the start of neck wrapping is difficult. It becomes uncertain, and as a result, you may not be able to perform root wrapping after the second stitch at all, or even if you are able to perform root wrapping,
There is a drawback that the root wrapping thread tends to unravel, resulting in poor root wrapping.

This invention has been developed in view of the above-mentioned circumstances, and has been developed to provide a neck-wrapping button that securely holds and scoops the thread end when sewing the first stitch, and allows the prescribed neck-wrapping button to be properly attached. The purpose is to provide sewing machines.

[Means for Solving the Problems] In order to achieve the above object, the neck wrapping button sewing machine according to the present invention has a sewing needle that reciprocates up and down at a fixed position, and a through hole through which the sewing needle moves. a throat plate; a button holder that holds a button sewn to the fabric via a root thread in a position where the root thread traverses the through hole of the throat plate along a substantially horizontal plane by folding the fabric in half; (1) A fabric holder that is inserted between the middle of the two-folded fabric to fix the fabric; (1) a fabric presser that comes into contact with the top surface of the two-folded fabric and presses the fabric from above; and the button holder and fabric holder described above. A driving device that synchronously reciprocates in two-dimensional directions perpendicular to each other in a horizontal plane and a tip position of the fabric holder are moved in a direction from and to the side relative to the vertical movement plane of the sewing needle to adjust the position of the first needle for neck wrapping. A first needle position adjustment mechanism is provided.

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

[Function] According to the present invention, the fabric on which the button is sewn via the root thread is folded in half, the button is held in a button holder, and the fabric holder is inserted in the middle of the fabric folded in half, And, by abutting the fabric presser foot against the upper surface of the folded fabric from above, the button and the fabric are held firmly and Set in a predetermined neck wrapping sewing position without wrinkles or the like.

In this state, by operating the sewing machine, the sewing needle is reciprocated up and down, and the button holder and fabric holder are synchronously reciprocated in a two-dimensional direction orthogonal to each other in a horizontal plane, taking a predetermined step for each stitch. While moving the sewing machine step by step, perform neck wrapping sewing on the root thread.

Prior to the start of the above neck wrapping sewing, the
The sewing position of the first stitch is adjusted by moving the tip position of the fabric holder in the distance direction relative to the vertical slow movement surface of the sewing needle according to the thickness and material of the fabric through the needle position adjustment mechanism. should be set at the folded part of the double-folded fabric at a position that can provide sufficient resistance to the neck wrapping thread to prevent it from slipping out, thereby ensuring that the end of the thread is held at the start of neck wrapping sewing. I can do it.

In addition, the sewing speed at the start of neck wrapping can be automatically changed to a slower speed than during steady stacking, so even if the fabric is slippery or the mesh is rough, the stitching speed can be automatically changed to a lower speed than the stitching speed at the time of steady stacking. This prevents the yarn from falling down the fabric due to inertial force, making it possible to more reliably hold the yarn end by the fabric.

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

Figures 1 and 2 are perspective views of essential parts, and in the figures, (1) is a sewing needle, and this sewing needle (1) is a lifting drive mechanism (not shown) provided in the sewing machine arm (11). etc., to reciprocate up and down a fixed position. (12)
is a fabric guide, and on the underside of this fabric guide (12),
A through hole (13a) through which the sewing needle (1) moves vertically.
The throat plate (13) with a needle plate (13) is arranged and fixed in close contact with each other. (14) is a button holder, consisting of a pair of arc-shaped clamping pieces (14a) and (14b) that elastically hold the button (6) from both sides of the button holder; (15)
is a cylinder for rotating the button holder, and this cylinder (1
5), the button holder (14) is attached to the button holder (14) through the connecting rods (16) and (17) by the button (6) in the sewing position shown in FIG. 1 and in the sewing position shown in FIG. Switch to the winding sewing position.

(18) is a stopper screw, and the above button holder (1
4) This is for initial adjustment of the root sewing posture and the neck wrapping sewing posture.

(19) is a fabric holder which folds in half the fabric (8) on which the button (6) is to be worn, and is inserted into the middle of the folded fabric (8) to fix the fabric (8).

(20) is a cylinder for rotating the dough holder, and the contraction and expansion of this cylinder (20) connects the connecting rods (21) and (22).
, the shaft (23), and the racket (24) to switch the fabric holder (19) between a fixed state and a released state relative to the fabric (8). (25) is a dough presser, (26) is a dough presser operating cylinder, and this dough presser (25) is the upper surface of the double-folded fabric (8) placed on the fabric guide (12) by the fabric holder (19). The needle plate (13) is brought into contact with the fabric (8) from diagonally above, as shown in Figure 3.
This prevents the fabric (8) from bending by pressing it toward the front CF) which moves away from the fabric (8).

(27) is a movable table, and this movable table (27)
are two stepping motors (28) and (29) which will be described later.
) and timing belts (38) and (39) to synchronously reciprocate in two-dimensional directions perpendicular to each other in a horizontal plane, that is, in the X-Y axis directions. (30) and (31) are a pair of left and right fabric holder arms, which are fixed to both the left and right sides of the movable table (27). The pair of fabric holder arms (30) and (
31) The fabric guide (12) is fixedly connected to the fabric guide (12) between the two, and the shaft (23) is supported by one fabric holder arm (30). (32) is a button holder arm, which is supported by the movable table (27) via an arm joint (33).

With the above configuration, the button holder (14) and fabric holder (19) can be synchronously reciprocated in the x-y axis directions via the movable table (27).

Reference numeral (34) denotes a fabric holder m1ll plate, which is provided along the outside of the one fabric holder arm (30), and its lower end is attached to be swingable around a shaft (23).

Reference numeral (35) denotes a shaft arm stopper, which is fixed to the connecting rod (22) and has a bent piece (35a) that can come into contact with the upper side of the intermediate portion of the fabric holder adjustment plate (34).

(36) is the stopper [j], and the fabric holder arm (
30), and its distal end is attached to the upper end of the fabric halter adjustment plate (34) via a support shaft (37).

With the above configuration, by rotating the stopper adjuster (36) while the fabric holder rotation cylinder (20) is in the extended state, the tip of the fabric holder (19) can be rotated as shown in FIG. Notch (19a) formed in
) with respect to the vertical movement plane of the sewing needle (1) in the front-rear direction C.
y-y) to adjust the first needle position for neck wrapping.

FIG. 5 is a block diagram showing an overview of the control system of the neck wrapping button sewing machine having the above-mentioned configuration.
40) is a microcomputer unit (hereinafter referred to as the microcomputer unit) that stores various data and a block memory (40A) that can program a series of sequential operations such as root sewing and neck wrapping sewing for attaching buttons, sewing speed, etc. Accessible data memory (40
B) and central processing unit (hereinafter referred to as CPU) (4
0G), (41) to (48) are WIJ1 to 8th setting devices arranged on the operation panel (55),
Each is connected to the microcomputer unit (40) via an interface circuit (49).

The first setter (41) allows fine adjustment of the X-axis origin position (X=O), and the second setter (42) allows fine adjustment of the Y-axis origin position (Y=O).
O), and these first and second
Movable table (27) by setting devices (41) and (42)
The origin position is adjusted to correspond to the type of button (16), the pitch of buttonholes, etc.

The third setting device (43) sets the hole pitch (P) of the button (6) as shown in FIGS. 6(a) and (b), and
The setting device (44) is used to set the unit movement amount (P+△X) of the movable table (27) in the X-axis direction during the neck wrapping process, and the hole pitch (P) is determined by the third setting device (43). Since it is set, only ΔX is actually the set value.

The fifth setting device (45) is used to set the position from which to start neck wrapping on the fabric (8), from the position (0) of the first stitch sewn into the fabric (8) to the position of the second stitch. No place! (
The amount of movement of the movable table (27) in the Y-axis direction up to A) (
△y).

The sixth setting device (46) sets the unit movement amount (y) of the movable table (27) in the Y-axis direction during the neck wrapping process, that is, after the second stitch. The seventh setting device (47) is the button (6
) is used to set the number of needle movements (n) during the root wrapping process, and the eighth setting device (48) sets the number of needle movements (N) during the neck wrapping process.

The microcomputer unit (40) includes the seventh setting device (4).
7) has an up/down counter (not shown) that subtracts the number of hand movement (n) set by CPU (4).
The button holder rotation cylinder (15) contracts in response to the rooting process end signal (S) output from the button holder (0C) to the cylinder driver (52) via the I10 boat (51). (SO) is a sensor that detects contraction of the button holder rotation cylinder (15). A reed switch or the like is used as this sensor (50), and the detection signal (Sl) is inputted to the microcomputer unit (40) via the interface circuit (53) to control the transition to the next neck wrapping process. Output an acceptable signal.

(54) 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 number of stitches (n) mentioned above reaches zero. The detection signal (Sl) is input to the microcomputer unit (40) via the interface circuit (53). A reed switch or the like is used as this sensor (54), and its detection signal (Sl) and the sensor L (50
) based on the logical OR operation with the detection signal (sB), I
The operating signal (S3) is output to the motor driver (56) through the 10 port (5]), and the two stepping motors (28) and (29) operate simultaneously, causing the movable table (27) to -Moves in the X-Y direction by the amount set by the fifth setters (43) to (45).

In addition, in the program memory (40A) in the microcomputer unit (40), the sewing speed (Vt) of the first stitch and the second The sewing speed (v2) of the stitches is compared to the sewing speed (v3) at steady time, so that Vl<V2< V3
A selectable speed program is stored in advance between a first mode that is set to have the following relationship and a second mode that is set to a constant high-speed sewing speed (v3) from the beginning of sewing to the end of sewing.

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

As shown in Figure 1, the button (6) is attached to the button holder (14) which is in the sewing position due to the extension of the cylinder (15).
At the same time, the fabric (8) is folded in half and set in the fabric holder (19).Next, the cylinder (20) is extended by depressing a pedal (not shown), and the fabric holder (19) is held elastically. is pressed and fixed together with the folded fabric (8) on the upper surface of the fabric guide (12), and the fabric presser (26) is tightened by extending the cylinder (26).
Or press down on the top of the half-folded fabric (8) from above.
) In this state, the sewing machine starts operating and moves the movable table (27) back and forth in the X-axis direction by the amount of pitch (P) preset by the third setting base (43). At the same time, sewing is performed at the number of stitches (f+) set in advance by the seventh setting device (47) (step 1oo).

When this sewing process is completed, the sewing needle (1) reaches the top dead center and the sewing machine stops operating (step 101).
When the sewing machine stops operating, the thread trimming knife (not shown) operates to trim the thread, and the sensor (
54) is input to the microcomputer unit (40) via the interface circuit (53), and when the number of hand movements (n) reaches zero, the CPU
(40G) to the cylinder driver (52) via the I10 boat (51).
S), the cylinder (15) contracts and the button holder (14) rotates, and the button holder (14) is switched to the neck wrapping sewing position as shown in FIG. The contraction of the cylinder (15) is detected by the sensor (50) (step 104), and the detection signal (Sl) is inputted to the microcomputer unit (40) via the interface circuit (53). In this microcomputer unit (40), the third to sixth setting devices (4
3) to (46) and the data input in advance to the data memory (40B) via the eighth setting device (48), that is, the unit movement amount (
P+△x), from the first stitch position (0) at the start of neck wrapping to the second stitch position! Y of movable table (27) up to (A)
Based on these data, read out the amount of movement in the axial direction (Δy), the amount of movement in the Y-axis direction (y) of the movable table (27) after the second stitch, and the number of stitches in the neck wrapping process (N) (step 105). Then, the CPU (40C) creates movement data for the movable table (27) (step 106).

Next, from the microcomputer unit (40) to the I10 port)
Based on the actuation signal (S3) output to the motor driver (56) via (55), the movable table (27)
The sewing machine moves to the sewing position (0) of the first stitch via the motors (28) and (29) (step 107), and then the sewing machine starts operating. In step 108), it is determined whether the first mode or the second mode has been selected among the speed programs. If the first mode has been selected, the neck wrapping process is operated at a speed of Vl. If the second mode is selected, the neck wrapping process is started at a speed of v3 (step 110).

Then, it is determined whether or not the table movement data created in step 106 has been completed (step l1l
), and when all the data is completed, stop the operation of the sewing machine (step 112), and turn on the first and second setting devices (step 112).
1) and (42), the movable table (27) is returned to the preset origin position (step 113) to complete the neck wrapping process.

On the other hand, in step 111, if the table movement data has not yet been completed, table movement! I+@
(step 114), and when the table movement signal is present and the selected speed program is in the first mode, the end of sewing the first stitch and the beginning of sewing the second stitch are determined. Upon completion of the process, it is determined whether or not it is necessary to change the speed. Step 115) Change the speed to 2 or V3 (Step 116) While moving the movable table (27) by the set amount in the X-Y axis direction (step 117)
), when the neck wrapping for this one stitch is completed, change to the next table movement data is performed (step 118).
, returns to step 111, and performs neck wrapping at a predetermined number of needle movements (N).

By the above-mentioned operations, the neck wrapping is performed at the hand movement positions shown in Fig. 9 (A) to (N), and the button (6) is removed from the fabric (8) as shown in Fig. 10. Solidly raw while floating! (8) is obtained, but prior to this neck wrapping sewing, by rotating the stopper adjustment tool (36), the tip of the fabric holder (19) is attached to the fabric (8). By moving it in the front-back direction according to the thickness and material of the fabric (8), the position M(0) of the first stitch for neck wrapping can be adjusted in the thickness direction at the folded part of the fabric (8). Sufficient pull-out prevention resistance is applied to the starting end of the neck wrapping thread (9) through the fabric (8) to prevent the starting end from coming out upward as the sewing needle (1) returns to the upward position. (9) It is possible to reliably hold the starting end and to reliably perform yarn scooping with the louver.

In addition, by providing a sewing speed variable means that can change the sewing speed (Vl) at the start of neck wrapping to a lower speed than the sewing speed (v3) during steady neck wrapping, it is possible to Even if the thread is rough, it can prevent the neck wrapping thread from pulling out downwards due to inertia, and regardless of the material of the fabric (8), the end of the neck wrapping thread can be prevented from slipping out into the fabric. Sewing retention can be made even more reliable.

In addition, by increasing the sewing speed during steady neck wrapping,
To maintain sufficiently high efficiency of neck wrapping sewing as a whole.

Although the explanation was omitted in the above embodiment, the sewing speed during root sewing can be set to the same speed relationship as that during the neck wrapping sewing described above, and in this case as well, the efficiency of root sewing can be improved. However, removing the threads at the initial stage of Netsuke JIi has the effect of preventing this phenomenon.

In addition, in the above embodiment, a configuration is shown in which one sewing machine can perform root sewing and root wrapping continuously.
A button sewing machine exclusively for winding may be used.

In step 103 shown in the flowchart of FIG. 8, a thread tension device (not shown) provided for adjusting the tightness of the thread is adjusted according to the thickness and material of the thread used for neck wrapping. This is an adjustment process.

[Effects of the invention] As described above, according to this invention, the first
Not only can stitches be sewn into the fabric, but also the position of the first stitch can be adjusted arbitrarily depending on the thickness and material of the fabric, so the position of the first stitch can be sewn into the fabric. It becomes possible to have a sufficiently large resistance to retaining the material.

Therefore, without using a special thread end locking device,
By effectively utilizing the fabric itself, it is possible to reliably prevent the end of the neck-wrapping thread from pulling out upwards, and to perform the root-wrapping from the second stitch onward smoothly and with good thread line. This prevents the root wrapping thread from coming loose and unraveling after the button is attached.

In addition, since the sewing speed at the start of neck wrapping can be automatically changed to a lower speed than the sewing speed during steady neck wrapping, the stitching speed as a whole can be maintained sufficiently high while the neck wrapping thread is This prevents the puller from falling under the cloth, even on slippery fabrics or rough mesh fabrics.
The yarn ends can be reliably held within the fabric.

[Brief explanation of the drawing]

1 and 2 are respectively perspective views of the main parts of a neck wrapping button sewing machine according to an embodiment of the present invention, FIG. 3 is an enlarged side view of the main parts, and FIG. 4 is adjustment of the first needle position. Figure 5 is a plan view of the main parts explaining the l! of the control system. 6(a) and 6(b) are front views and plan views for explaining the setting of the table movement amount, FIG. 7 is a graph showing the speed program, and FIG. 8 is for explaining the operation. Flow chart, Fig. 9 is an explanatory diagram of the neck wrapping position, Fig. 1O is a perspective view of the main part showing the completed state of button attachment, Figs. 11 (a) (b)
) is a side view and a plan view showing a schematic configuration of a conventional neck wrapping button sewing machine, and FIG. 12 is an explanatory view of the neck wrapping position by the conventional neck wrapping button sewing machine. (1)...Sewing needle, (6)...Button, (7)...
Root thread, (8)...Fabric, (12)...Fabric guide,
(13)--throat plate, (14)--button holder,
(19)...Dough holder (25)...Dough presser,
(27)...Movable table, (28). (29)...Stella pink motor, (34)...Dough holder adjustment plate, (35)...Axis arm stopper, (
36) - Stopper adjustment tool, (40) - Microcomputer unit, (40A) - Program memory, (4
0B)...Data memory, (40G)...CPU,
(41) to (48)...first to eighth setting devices. Figure (a) Figure N (b) ○FF

Claims (2)

[Claims] (1) A sewing needle that reciprocates up and down at a fixed position, a throat plate with a through hole through which the sewing needle passes, and a button sewn to the fabric via the root thread, which is folded in half and folded into the fabric. a button holder that holds the button in a position that crosses the through hole of the throat plate along a substantially horizontal plane; a fabric holder that is inserted between the two folded fabrics and fixes the fabric; A fabric presser presses the fabric from above; a drive device synchronously reciprocates the button holder and the fabric holder in two-dimensional directions orthogonal to each other in a horizontal plane; A neck wrapping button sewing machine comprising: a first needle position adjustment mechanism that adjusts the position of the first needle for neck wrapping by moving it in a distance direction with respect to a vertical movement plane. (2) The neck wrapping button sewing machine according to claim 1, further comprising a sewing speed variable means that can automatically change the sewing speed at the start of neck wrapping to a sewing speed lower than the sewing speed during steady neck wrapping.