JP2655749B2 - Sewing machine with button - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a button sewing machine in which buttons are sewn to a cloth, and root wrap sewing is performed between the sewn cloth and the buttons. It is.

[Prior Art] Conventionally, as a sewing machine of this type, a sewing machine provided with a mechanism as shown in FIGS.

This mechanism includes a tongue 1 for holding a button sewing position of the cloth W in a bent state as shown in FIG. 9 (b) with respect to an elevating path of the sewing machine, and a support provided opposite thereto. A plate 2 and a holding member 3 for holding a button capable of holding the button B horizontally or vertically are provided. When the button B is sewn to the cloth W, the button holding member 3 first positions the button B in a horizontal state above the tongue 1 and the cloth W held on the support plate 2 ( (See FIGS. 9A and 9B). Then, when the sewing machine is driven, the tongue 1, the support plate 2 and the button holding member 3 move horizontally together in synchronization with the raising and lowering operation of the sewing needle, and the button sewing hole is formed.
The sewing needles N are alternately dropped on Ba to form a single thread stitch, and the button B is sewn.

Thereafter, when the sewing operation is completed, the button holding member 3 holds the button B in a state perpendicular to the tip of the tongue 1 as shown in FIG. 9C. Here, when the sewing machine is driven again, the tongue 1, the support plate 2 and the button holding member 3 move in the horizontal direction, and the stitches Sa and Sb connecting the button B and the cloth W are connected.
The sewing needles N are alternately dropped on both sides of the sewing machine, and root winding sewing is performed on the stitches Sa and Sb.

In addition to the effect of increasing the sewing strength of the button B and preventing the stitching of the sewn button B, the buttonhole is sewn when the button is pressed. There is also an effect that it is possible to prevent the appearance of unsightly appearance of being spread by the eye yarns Sa and Sba. That is, by performing root winding sewing, the stitches Sa and Sb are squeezed inward by the root winding Sc to be in a narrow and converged state, so that the buttonhole is not greatly pushed open.

[Problems to be Solved by the Invention] As described above, it is desirable that the stitches Sa and Sb be squeezed as thinly as possible. The tension applied by the wearing operation is directly generated on the stitches Sa and Sb,
As shown in FIG. 7A, since the thread is in the stretched state, the sewing threads Sa and Sb are not squeezed much inward, and there is a problem that the root winding portion cannot be formed sufficiently thin.

For this reason, the thread tension of the root winding thread Sc is increased, and the seam thread is forcibly forced.
It is conceivable to squeeze Sa, Sb inward, but in this case, as shown in FIG.
Has been lifted upward, causing the inconvenience that wrinkles W1 occur around the seam forming portion of the cloth W, resulting in a significant deterioration in the quality of the sewn product.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a sewing machine with a button which can perform root winding sewing without generating cloth wrinkles around a stitch forming portion.

Means for Solving the Problems The present invention performs a sewing operation in a state in which a button is held horizontally by a button holding member, and then holds the button vertically, and connects the cloth and the button. A button-adjusting sewing machine that performs root winding sewing on a sewing machine, further comprising an interval adjusting mechanism that relatively adjusts an interval between a button holding member that holds a button and a cloth holding member that holds a cloth, and the interval adjusting mechanism. Control means, the control means, in the horizontal holding state of the button, the interval between the button and the cloth, while maintaining a predetermined amount larger than the preset finishing interval, in the button vertical holding state, The interval between the button and the cloth is returned to the finishing interval.

[Operation] The button holding member according to the present invention holds the button at an interval larger than a preset finishing interval in the sewing operation of the button and the cloth, ends the sewing operation, and holds the button vertically. In this state, that is, the interval between the button and the cloth is returned to the finishing interval before the root winding sewing operation. As a result, a margin is provided for the stitches, so that the stitches can be narrowly converged by the root winding sewing operation, and even if the stitches are converged inward, excessive tension is generated in the stitches. The cloth is not pulled with the seam. Therefore, no wrinkles are generated on the cloth.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 and FIG. 2 are a perspective view and a plan view showing the appearance of this embodiment. In the drawing, reference numeral 10 denotes a support shaft horizontally held by an arm 11 provided on a movable base M, and reference numeral 12 denotes a tongue having a rear end fixed to a mounting member 13 rotatably provided on the support shaft 10. A needle drop groove 12a is formed at the tip. Reference numeral 14 denotes a support plate for holding the cloth W in a bent state together with the tip of the tongue 12, and is linked to the moving table M. The movable table M, the support plate 14, and the arm 11 supporting the tongue 12 are horizontally moved in two orthogonal directions (X, Y directions) in synchronization with the elevation of the sewing needle N by an X, Y drive mechanism (not shown). It can be moved.

Reference numeral 16 denotes a rotation shaft rotatably supported by an arm 17 provided on the movable table M, and reference numeral 18 denotes a cylinder provided on the arm 17. The distal end of the cylinder rod 18a of the cylinder 18 is connected to one end of the rotary shaft 16 via a connecting member 19, and the cylinder rod 18a projects and retracts,
The rotating shaft 16a is rotated 90 degrees in the directions a and b.

Reference numeral 21 denotes a rotary table fixed to the rotary shaft 16, and the rotary shaft
The rotation of the rotation 16 moves from the position shown in FIG. 1 to the position shown in FIG. As shown in FIG. 3, guide members 22a and 22b are fixed to both sides of the turntable 21, and the frame-shaped slide member 23 can move along the guide members 22a and 22b. It has become. Further, a shaft portion 24a of a dial 24 is fitted into the rotary table 21, and an eccentric cam 25 fitted into the slide member 23 is fixed to the shaft portion 24a. The slide member 23 is urged by a spring 26 so that a fixed portion of the inner surface thereof is always in pressure contact with the outer peripheral surface of the eccentric cam 25. Therefore, when the operator rotates the dial 24 to rotate the eccentric cam 25, the slide member 23 is moved to the guide member 22.
a, 22b.
Can be changed linearly.

The inner surface of the slide member 23 is always in contact with the cam 25 only once, and the other portions are not in contact with the eccentric cam 25. Therefore, if the slide member is pressed against the spring 26, the slide member 23 can be moved along the guide members 22a and 22b.

Reference numeral 30 denotes a mounting plate fixed to the moving block 22. The mounting plate 30 has grooves 30a and 30b extending in directions intersecting with each other as shown in FIG. , 30b are movably fitted with button holding members 31A, 31B. Racks 31A1 and 31B1 are formed on opposing surfaces of the button holding members 31A and 31B, respectively. Gears rotatably mounted on the mounting table 30 are provided on the racks.
32 are engaged. For this reason, both button holding members 31A, 31
The button holding portions 31a and 31b of B move symmetrically in directions adjacent to each other. Further, one holding member 31
B is constantly urged in the direction c by the spring 33, and the urging force holds the button B between the button holding portions 31a and 31b.

4 (a) and 4 (b), reference numeral 40 denotes the arm 11
Is a push-up lever rotatably held by a shaft 20 horizontally supported by the lever. At the rear end of the push-up lever 40, a cylinder rod of a cylinder 41 provided on the arm 11 is provided.
41a is mounted on a shaft, and is rotated in the vertical direction by the protruding and retracting operation of the cylinder rod 41a. Therefore,
When the slide member 23 is in the state as shown in FIG. 2, that is, when each of the holding portions 31a, 3 of the button holding members 31A, 31B
When the cylinder rod 41a is projected when 1b is in the horizontal state, the front end portion 40a of the push-up lever 40 presses the lower surface of the mounting base 30, pushes up the slide member 23 against the urging force of the spring 26, and pushes the button. The distance between B and the cloth W is increased.

Reference numeral 42 denotes an adjusting screw for adjusting the amount of upward rotation of the push-up lever 40, and by rotating the head 42a, the screw portion 42b advances and retreats, and the rear end portion when the push-up lever 40 is rotated upward. , And restricts upward rotation of the push-up lever 40. The push-up lever 40, the cylinder 41, and the adjusting screw 42 constitute an interval adjusting mechanism.

 Next, the operation will be described.

At the time of the button sewing operation, the operator first bends the cloth W along the tip of the tongue 12 as shown in FIG.
14 and the button B
It is press-fitted between both holding portions 31a and 31b of 31A and 31B to be held.

In this initial state, the holding portions 31a and 31b are in a horizontal state as shown in FIGS. 2 and 6 (a).
The interval between the button B and the cloth W is set to a finishing interval t set in advance by the dial 24.

Thereafter, when the sewing machine operation start switch is turned on, a control means (not shown) constituted by a microcomputer or the like controls the driving of the sewing machine motor for raising and lowering the sewing needle N, the X and Y drive mechanisms, and the respective cylinders. The sewing operation is performed according to the procedure shown in FIG.

That is, in response to the turning on of the sewing machine operation start switch, first, the cylinder rod 41a of the cylinder 41 protrudes, and the push-up lever 40 rotates upward until it comes into contact with the adjustment screw 42b (steps 1, 2). As a result, the slide member 23 is pushed up against the spring, and the distance between the button B and the cloth W is increased by Δt (for example, 1 mm) from the finishing distance t set in the initial state described above.

Thereafter, the sewing machine motor and the X and Y drive mechanisms are operated, the sewing needles N are alternately dropped into the pair of button sewing holes Ba and Ba to form a single thread ring stitch, and the button B is sewn to the cloth W. I do. At this time, a predetermined tension set in advance by the thread tension of the sewing machine or the like is generated in the stitch thread Sa connecting the button B and the cloth W, and as shown in FIG. Sa and Sb are in an extended state.

Then, when the sewing operation is completed, the cylinder rod 41a of the cylinder 41 enters the retracted state, and the push-up lever 40 descends to release the pressing of the slide member 23 (Step 4). As a result, the slide member 23 is lowered to the initial position by the urging force of the spring, so that the button holding members 31A and 31B are also lowered, and the interval between the button B and the cloth W returns to the original finishing interval t (FIG. 6). (C)). As a result, the stitches Sa and Sb are loosened as shown in FIG. 7 (b), and no tension is generated.

Next, the cylinder rod 18a of the cylinder 18 is immersed,
The rotation shaft 16 is rotated by 90 ° in the direction a through the connecting member 19 (step 5). As a result, the moving table is
21, slide member 23, mounting base 30, and button holding member 31
A and 31B also rotate with the rotation shaft 16, and the button holding members 31A and 31B
The button B sandwiched between the buttons is in a vertical state as shown in FIGS. 1 and 6 (d).

Here, the sewing machine motor and the X, Y drive mechanism are operated again, and the sewing needles N are alternately dropped on both sides of the stitches Sa, Sb to form a single thread ring stitch, and the stitches Sa, Sb Is wound around the periphery of the wrapper and a root wrap sewing is performed (step 6). At this time, the seam thread
Since the looseness is formed in Sa and Sb by the previous operation, almost no tension is generated in the stitches Sa and Sb even when the root winding Sc squeezes the stitches Sa and Sb inward. However, as shown in FIG. 7 (c), the state is narrowed and converged by the root winding thread Sc. Therefore, even if this is inserted into a buttonhole or the like, the appearance of the buttonhole being greatly pushed open does not occur, and the locking state to the buttonhole can be improved.

Further, since root winding sewing can be performed without generating excessive tension on the seam thread Sa.Sb, there is a disadvantage that the cloth W is pulled up by the seam thread and wrinkles occur as in the related art. And the selected sewing quality can be obtained. Thereafter, when the root winding sewing operation is completed, a thread cutting mechanism (not shown) is operated to cut the thread connected to the sewing needle N, the cylinder rod 18a of the cylinder 18 is projected, and the button holding members 31A and 31B are moved. Return to the initial position,
A series of sewing operations ends (steps 7, 8).

In the above embodiment, the case where the two-hole button is sewn to the cloth has been described as an example. However, it is needless to say that the four-hole button can be sewn.

[Effect of the Invention] As described above, the button-attached sewing machine according to the present invention includes the adjustment mechanism for adjusting the interval between the button and the cloth,
At the time of button sewing, the interval between the button and the cloth is maintained at an interval larger than the finishing interval, and at the time of root winding sewing operation, it is returned to the finishing interval, and the root winding sewing is performed with a margin for the stitch thread. Since it is performed, the root winding sewing can be performed without generating excessive thread tension on the stitch thread. For this reason, the sewing thread can be made to converge finely by the root winding thread, and it is possible to prevent the buttonhole from being greatly expanded when the button is applied, and
The seam also eliminates wrinkling of the cloth, and excellent sewing quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of an embodiment according to the present invention,
FIG. 2 is a plan view of what is shown in FIG. 1, FIG. 3 (a) is a front view showing the structure around the moving table shown in FIG. 2, and FIG. 2 (b) is shown in FIG. FIG. 4 (a) is an enlarged front view of the main part of FIG. 3, FIG. 4 (b) is a side view of FIG. 3 (a), and FIG. 5 is this embodiment. 6 (a), (b), (c) and (d) are side views showing the respective operating positions of the button holding member in this embodiment, and FIG. 7 (a) is a button sewing operation. FIG. 4B is an explanatory front view showing the state of the seam immediately after the wearing operation, and FIG. 4B is an explanatory front view showing the state of the seam when the interval between the button and the cloth is set to the finishing interval; ) Is a plan view showing a state where root wrap sewing is performed in this embodiment, FIG. 8 is a perspective view showing a conventional button sewing machine, and FIG. 9 (a) is a conventional button sewing machine. FIG. 2B is a plan view showing an operation state when sewing a button by the attaching sewing machine, FIG. 2B is a side view of FIG. 1A, and FIG. 1C is a plan view showing a state of the button holding member during root winding operation. 10 (a) and (b) are plan views showing the state of the stitches in the state of FIG. 9 (c),
FIG. 2B is a plan view showing a state where root wrap sewing is performed on the one shown in FIG. 1A. In the figure, 12 ... tongue (cloth holding member) 14 ... support plate (cloth holding member) 31A, 31B ... button holding member 40 ... push-up lever (spacing adjustment mechanism) 41 ... cylinder (spacing adjustment mechanism) 42 …… Adjustment screw (interval adjustment mechanism) B …… Button W …… Cloth N …… Sewing needle

Claims (1)

(57) [Claims] A cloth holding member for folding and holding a button to be sewn on, a plate-shaped cloth holding member for positioning the bent position in an ascending and descending path of a sewing needle; A button holding member that can hold the held button by switching horizontally or vertically with respect to the moving direction of the needle, and alternately sewing sewing needles in a plurality of sewing holes formed in the horizontally held button. And sew the button on the cloth,
After the button sewing operation is completed, in a button sewing machine in which a button is held vertically and sewing needles are alternately dropped on both sides of a stitch formed between the button and the cloth to perform root winding sewing, The button holding member is provided with an interval adjusting mechanism for relatively adjusting an interval between the cloth holding member, and a control unit for controlling the interval adjusting mechanism is provided.The control unit includes a button in the button horizontal holding state. A button-sewing machine, wherein the interval between the button and the cloth is maintained at an interval larger than a preset finishing interval, and the interval between the button and the cloth is returned to the finishing interval in the button vertical holding state.