JP2721713B2 - Button sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a button-stitch sewing machine, and more particularly to a double-thread sewing machine with a root-wrap sewing and a common sewing with a button without a root-roll.

2. Description of the Related Art Button wrapping is performed by forming a seam so that the thread of the wrap around the button thread between the cloth and the button attached to the cloth.

To do this, the button is flipped from a horizontal position to a vertical position and held to hold the thread with the button parallel to the machine bed.

On the other hand, the solid stitch is to sew the button in a state where the button is in contact with the cloth.

Conventionally, a button-stitched sewing machine has performed root winding sewing and solid sewing with separate sewing machines.

Problems to be Solved by the Invention However, in the conventional sewing machine as described above, since the root wrap sewing and the solid sewing are performed separately, it is necessary to perform the root wrap sewing and the solid sewing in one piece of clothing. There is a drawback that the clothes must be transported to other work, which makes the work troublesome. Further, if the sewing machine for the root winding sewing and the sewing machine for the solid sewing are placed in one work place, there is a disadvantage that the occupied area must be increased and the equipment cost increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a button sewing machine which solves the above-mentioned disadvantages of the prior art.

Means for Solving the Problems A button sewing machine according to the present invention for achieving the above-mentioned object includes a button holding mechanism for holding a pair of levers forming a button holder so as to be relatively movable, and a button sewing machine for wrapping a button. A needle plate switching mechanism that introduces each needle plate below the needle, a button height adjustment mechanism that adjusts the distance between the button and the cloth, a reversing mechanism that reverses the button to the root winding position, and a solid sewing root of the button And a control mechanism for controlling each of the winding stitches as a required sequence.

According to a preferred embodiment, the button holding mechanism includes a pair of levers each having a rack, a button chuck formed at a lever end, a pinion meshing with both racks, and a mounting plate for sliding the lever at a predetermined relative angle.

According to another embodiment, the chuck is concave with the line parallel to the sliding of the lever being a bisector.

According to another embodiment, a stopper is inserted between the reversing member of the reversing mechanism and the sewing machine frame, and the stopper acts when the height is less than the minimum root height.

Other embodiments further include a fabric retaining mechanism that retains the fabric as a double in the root winding position.

According to another embodiment, there is provided a mechanism for converting a cloth contact for attaching a root wrap button and a cloth holding plate for solid sewing in conjunction with the operation of the cloth holding mechanism.

According to another embodiment, the conversion mechanism includes a wire connecting the fabric rest and the foot plate, and means for moving the wire in response to actuation of the tongue of the fabric holding mechanism.

According to another embodiment, the thread handling mechanism is housed in a recess of the needle plate for root winding sewing.

According to another embodiment, a force button holder is mounted on a free end of a lever pivotally supported on a frame of the sewing machine, and the lever is operated by a cylinder.

A manual operation method according to another embodiment includes an upper position signal means for detecting a needle position, and operates the synchronizer by reciprocating the needle several times in the needle position.

Operation With the above-described configuration, the button-stitched sewing machine of the present invention can switch between solid sewing and root winding sewing very easily and reliably, and can be implemented as a sequence of a control device.

Examples Examples and drawings illustrating the present invention will be described.

FIG. 1 is a plan view of a button sewing machine according to the present invention, in which a normal sewing mechanism is removed. A button holding mechanism 2 for holding a button 1, a needle plate 3 for solid sewing and a needle plate 4 for root winding sewing are shown. Needle plate switching mechanism 5 and button reversing mechanism 6
And a control device (not shown).

The button holding mechanism 2 is shown in FIGS. 2 and 3, wherein grooves 12 and 13 having a required relative angle are formed in the mounting plate 11, and the button holders 14 and 15 are slidably engaged in the directions of arrows 14a and 15a, respectively. Let it. Racks 16 and 17 are formed on the holders 14 and 15, respectively. A pinion 19 is fitted in a circular groove 18 of the mounting plate 11 to engage with racks 16 and 17 so as to be rotatable about a pin 20. The upper surface of the mounting plate is covered with a cover (not shown) to prevent the holder and the pinion from falling off. The intersection of the two holders should be such that one does not obstruct free sliding. The tension spring 21 is engaged between the mounting plate 11 and one of the holders 15 to pull the holder in the closing direction.

The free ends of the button holders 14 and 15 are substantially L-shaped, and the opposing inner surfaces 22 and 23 (FIG. 2) holding the button 1 have lines a and b passing through the center C of the button 1 and parallel to the sliding direction of the holder. (FIG. 3). Line perpendicular to horizontal axis x
If lines 26, 27 are drawn at the same angle as the angle α at which 24, 25 intersects lines a, b, and if the inner surface formed by lines 24, 25 and lines 26, 27 is the button gripping surface, By relative sliding through the pinion 19, the holder opens right and left from the center C by the same dimension. Further, the opening formed between the holders 14 and 15 grips the button in the center position regardless of the size of the button.

The mounting plate 11 is mounted on the XY table of the sewing machine so that the center C in FIG. 3 coincides with the center of the stationary needle. The button 1 is inserted from below in FIG. 2 and the holders 14 and 15 are opened by the same dimension as the left and right from the center C of engagement with the pinion 19 in the grooves 12 and 13 of the mounting plate 11, and the button 1 is held. Prevent shedding. Button 1
The center coincides with the center C regardless of the size. Furthermore, since the only movable parts other than the holder are the pinions 19, the operation is simple and reliable.

The button detection device can have a required structure. Basically, the movement of the button holding device from the fully closed position is detected, and when the button holding device is moved from the fully closed position, it is assumed that the button is present. In a preferred example, a switch terminal inserted between one of the button holders 15 and the mounting plate 11 is used, and when the holders 14, 15 are opened to the minimum button size or more, the switch is opened or closed, and this signal is transmitted. The button presence signal is used. As another example, a hole is provided in the pinion 19 or one of the holders 14 and 15, and the grip of the button of the holder is detected by an optical sensor corresponding to the hole.

The needle plate switching mechanism 5 connects the needle plate 3 for solid sewing and the needle plate 4 for root winding sewing so as to be rotatable about a shaft 25a, and is rotated by 90 ° by a rotating device (not shown) such as an air cylinder.

The button height adjustment and reversing mechanism is shown in FIGS. 1 and 4 and the frame 31 is fixed on the XY table 30 on the sewing machine bed, and the shaft 32
, And a button lifting / lowering device 33 for vertically moving the button holding mechanism 2 is fixed to one end of the shaft 32 to constitute a button height adjusting mechanism. The other end of the shaft 32 connects the air cylinder 35 via a lever 34 to form a reversing mechanism, and rotates the shaft 32 and the button holding mechanism vertical device 33 by 90 °.

The housing 36 of the button height adjustment mechanism, that is, the button holding mechanism vertical device 33, is mounted on the mounting plate 11 of the button holding mechanism 2 via a rack and a pinion mechanism (not shown) or an eccentric shaft and a ring mechanism.
The mounting plate 11 and the button holders 14 and 15 are moved up and down by operating the knob 38 so that the button 1 has a required height with respect to the cloth. In a preferred example, a known click mechanism is interposed between the knob 38 and the housing 36 to stop the knob 38 at the required graduation position to prevent accidental movement. If necessary, a stepping motor (not shown) is used in place of the knob 38, and the button height is set according to a command from the control device.

Stopper 44 mounted on mounting plate 11 of button holding mechanism 2
Faces the stopper 45 fixed to the frame 31, and the mounting plate
When the height of 11 does not reach the minimum root winding sewing height, the stoppers 44 and 45 are engaged to prevent the air cylinder 35 from operating the button reversing mechanism.

Hold the buttons on the facing surfaces 22, 23 of the holders 14, 15,
By operating the knob 38 of the adjusting mechanism 33, the distance between the button and the cloth is set to a required value. In the case of solid sewing, the distance between the button and the cloth is small, and the stopper 44 attached to the mounting plate 11 of the holding device comes into contact with the stopper 45 attached to the frame 31 to prevent the mounting plate 11 from rotating. In case of solid sewing, there is no need to rotate,
Sewing continues at 11 stationary.

In the case of root wrap sewing, a button is provided by operating the knob 38 of the adjusting device 33 and setting the holders 14 and 15 on the mounting plate 11 to the required height. Since the mounting plate 11 has risen, the stoppers 44 and 45 are separated. By operating the air cylinder 35, the vertical device 33 and the button holding device 2 are rotated by 90 ° via the lever 34 and the shaft 32. The sewing machine performs root winding sewing. Since the click mechanism is inserted into the knob 38, the vertical adjustment position does not move unexpectedly.

The fabric holding mechanism 7 is shown in FIGS. This mechanism is for the purpose of holding the fabric in a double fold at the time of button wrap sewing, and is not used when the button is in the horizontal position. A holding plate 53 with a tongue 52 is fixed to a shaft 51 below the XY table of the sewing machine, and the shaft 51 is rotated by an air cylinder 54, and the button is turned to a vertical position by the reversing device 6 as shown in FIG. As such, the tongue 52 holds the fabric as a double fold, facilitating root wrap sewing. Tongue 52 by sensor not shown
Is detected.

As shown in FIG. 5, the root plate 4 has a relatively deep groove 55 for accommodating the holders 14, 15 and the like when the button is turned from the horizontal position in FIG. 6 to the vertical position in FIG. To create a space to work.

The operation of the sewing machine of the present invention will be described with reference to the sequence chart of FIG.

After the start 60, the root wrap sewing is selected 61. First, the solid sewing will be described.

The tongue sensor 62 indicating the rotation position of the tongue 52 of the cloth holding mechanism 7 is inspected, and the tongue movement 63 is performed as required. Next, the needle plate sensor is inspected 64 and, if necessary, the needle plate switching mechanism 5
To make the solid sewing needle plate 3 beneath the needle. Next, the button 1 is manually set 66, and the cloth is set 67. Inspect the button sensor 68 to confirm the button. Activate pedal 69
When the number-of-stitches counter 71 reaches a predetermined number of stitches 72, the sewing machine lower stop 74, the thread trimming upper stop 75, and the cloth removal 75 complete the solid sewing 76.

Next, root winding sewing is selected 61. The tongue sensor 77 performs tongue movement 78 as required. The needle plate sensor 79 moves the root winding needle plate 4 below the needle 80. Button 1
Is inserted 81 into the button holders 14 and 15. This causes the button sensor to indicate the presence of the button. When the pedal is operated 82 and the button sewing 84 is performed. When the sewing is changed from the solid sewing to the root winding, the mounting plate 11 and the holders 14 and 15 are set to required heights by the up-down device 33. When the number of stitches 85 reaches the predetermined number of stitches 86, the machine stops on the sewing machine 87 and stops on the thread trimming 88.
As a result, the mounting plate 11 and the holders 14 and 15 are turned 89 by 90 degrees. The cloth is set on the tongue 52 and moved 90, 91 to the position with the button. The button is in the position shown in FIG.
When the number of stitches 93 reaches a predetermined number of stitches 94, the sewing machine stops at 95 and the thread trimming stops at 96. The counterclockwise rotation 97 of the tongue 52 of the cloth holding device is performed. Position 98, remove the cloth 99, complete 100 with button.

FIG. 8 shows an apparatus for replacing a cloth pad 101 as a needle plate with a root wrap button and a cloth presser lower plate 102 as a solid sewing needle plate according to another embodiment of the present invention. In a normal sewing machine, the attachment is replaced.However, there are many cases where a root sewing button and a solid sewing button are mixed in one piece of sewing material.
Attachment replacement is impractical in practice. In the present invention, the tongue 53 of the fabric holding mechanism 7 is linked up and down.

As shown in FIG. 8, a pulley 105 in which a wire 103 for connecting a cloth contact 101 and a cloth presser lower plate 102 is attached to a frame 104,
Guided downwards by 106, 107, 108, an operating plate 109 is mounted on the vertical portion of the wire 103. Tongue 53 of fabric holding mechanism 7
Operation plate 1 by lever 110 attached to a part of the operation mechanism
By moving 09, the cloth contact 101 is set to the sewing position only when the tongue 53 is raised. The spring 111 always keeps the operation plate 109 below, that is, the presser foot lower plate 102 in the sewing position.

With the above-described configuration, the cloth wrap 101 for root wrap sewing is set to the sewing position when required without the need to replace the attachment.

FIG. 9 shows a yarn handling mechanism 120 according to another embodiment of the present invention. Conventionally, in the case of the needle plate 4 for the root winding sewing, a thread handling mechanism similar to that of the needle plate 3 for the solid sewing is used. However, since the seam is formed at a high position, the seam tends to be unstable. .

As shown in FIG. 9, according to the present invention, the root wrap sewing needle plate 4 is provided.
The thread handling mechanism 120 is accommodated in the button passing concave portion 121 of FIG. The thread handling mechanism 120 includes a swing lever 122 swinging back and forth by a groove cam 122a, a swing body 124 swinging left and right by a thread handling triangular cam 124a, and a thread operatively connected to the swing lever 122 and the swing body 124. The base of the handling body 123 is changed from a known thread handling mechanism (for example, JP-A-51-34054) to change the groove cam 122a.
And is disposed below the thread handling triangular cam 124a.
By arranging the tip of the thread handling body 123 at a normal position above the looper, a known thread handling action is performed by the combined action of the swing lever 122 and the swing body.

With this, the conventional groove cam 122a and the thread handling triangular cam 12
The swing lever 122 and the swing body 124 arranged above the 4a,
When the button holding mechanism is erected by removing the base of the thread handling body 123, the lower part of the button holding mechanism can be housed approximately half in the groove 55 in FIG. The button is close to the looper, and the stitch formation is in the same relative position as in the case of the button attaching step. The root winding can be performed without moving the cloth supported by the tongue 52, so that the sewing quality is stable. Moreover, the gap with the needle is widened, and the button setting is also improved.

FIG. 10 shows a force button sewing apparatus according to another embodiment of the present invention. Normal force buttoning is manual and inefficient. According to the present invention, the force button attaching can be automated.

As shown in FIG. 10, the button inversion mechanism 6 for inverting the button holding mechanism 2 is configured as described above, and the holders 14 and 15 hold the button 1. According to the present invention, the lever 132 is pivotally supported on the frame 131 on the XY table 30, and the force button holder 133 is attached to the lever end. The piston 135 of the cylinder 134 pivotally supported by the frame 131 is pivotally supported by the lever 132. This allows the force button 136 to be introduced below the upper button 1. The force button is small and has a button hole smaller than that of the button 1. The needle where the force button and the hole of the button 1 overlap is passed through the needle. Button and Button 1 are sewn.

The operation of the force button sewing device 130 will be described. First tenth
Button 1 is sewn in the state shown in the figure. Next, the cylinder 134 is operated to rotate the lever 132, and the force button 136 is set to a position below the button 1. Here, buttons 1136 are sewn. Next, the cylinder 134 is operated to return to the position shown in FIG. The cylinder 35 of the button reversing mechanism 6 is operated to activate the button holding mechanism 2.
Rotate 90 ° and perform the sewing. The button holding mechanism 2 is returned by the cylinder 35, and the holder is opened by the cylinder 137. The XY control is used to rotate a circle larger than the outer shape of the button and perform the wrapping around the button. The cylinder 35 is operated, the cylinder 137 is closed, and the button holding mechanism is rotated by 90 ° to perform the lock stitching. With this configuration, the force button attachment can be automated, and the efficiency is significantly improved.

11 and 12 show a manual feed operation method in a button sewing machine according to another embodiment of the present invention. Conventionally, in order to shift from the automatic sewing state to the manual operation method, it is necessary to rotate the flywheel one turn to generate a needle up signal and output a feed command. For example, in the case of a 20 stitch with a button, it is necessary to rotate 20 times. there were. The present invention overcomes the above-mentioned drawbacks by utilizing the performance of the synchronizer added to the flywheel.

In FIGS. 11 and 12, the normal mechanism instructs the feed by the signal of the detector 140 at a position immediately before the needle tip comes off the cloth. At the time of manual operation, the sewing machine pulley is rotated to start feeding at a point of 270 ° (141). The operation of the feed detector 140 is to prevent the needle from hitting the button if it is rotated slowly by a manual operation in order to allow for a delay in the feed of the mechanical part.

According to the present invention, the pulley of the sewing machine is slightly rotated several times so as to pass through the top of the needle at the time of manual operation, and the synchronizer is operated each time the pulley reciprocates to detect the top of the needle output from the synchronizer. Upper position signal
141 allows the button and cloth feed to be moved to the next step without hitting the needle with the button as is known. FIG. 12 shows the needle lower position 142 and the needle upper position 143.

Effects of the Invention According to the configuration of the present invention, solid sewing and root winding sewing can be performed under optimum conditions. In many cases, a single piece of clothing has a button that requires solid sewing and a button that requires root winding sewing. According to the present invention, the solid sewing and the root winding sewing can be performed by the sequence control of the control device. Performing without the need for extensive processing has significant advantages.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a button sewing machine according to the present invention, FIG. 2 is a plan view showing a button holding mechanism of the sewing machine shown in FIG. 1, and FIG. FIG. 4 is a perspective view showing a button upside-down mechanism of the sewing machine of FIG. 1, FIG. 5 is a perspective view showing a button inversion state of the sewing machine of FIG. 1, and a cloth holding mechanism, and FIG. FIG. 7 is a perspective view showing a part of the sewing machine shown in FIG. 7, FIG. 7 is a flowchart showing a sequence of the sewing machine of the present invention, and FIG. 8 shows a mechanism for converting a cloth holder for root winding and a cloth presser lower plate for solid sewing. Figure, ninth
The figure is a perspective view of a thread handling mechanism, FIG. 10 is a plan view of a force button automatic sewing device, and FIGS. 11 and 12 are diagrams of a manual operation mechanism. DESCRIPTION OF SYMBOLS 1 ... button, 2 ... button holding mechanism, 3 ... needle plate for solid sewing 4 ... needle plate for root winding sewing, 5 ... needle plate reversing device, 6 ...
Button reversing device 11… Mounting plate, 14, 15… Holder, 16, 17… Rack 19… Pinion, 21… Spring, 30 XY table 32… Shaft, 33… Vertical device, 38… … Knob 44,45… stopper, 52… tongue, 55… groove 101… cloth contact, 102… bottom plate, 103… wire 120… thread handling mechanism, 122… swing lever, 123: Thread handling body 124: Oscillating body, 132: Lever, 134, 137: Cylinder 133: Button holder, 140: Detector, 141: Needle position signal

Continuation of the front page (72) Inventor Masanori Shiraishi 8-2-1 Kokuryo-cho, Chofu-shi, Tokyo Juki Corporation (72) Inventor Hiroshi Horimoto 8-2-1 Kokuryo-cho, Chofu-shi, Tokyo Inside Juki Corporation

Claims (8)

(57) [Claims] A sewing machine capable of sewing with a button, comprising: a button holding mechanism for holding a pair of levers forming a button holder so as to be able to relatively move each other; Needle plate switching mechanism to be introduced below, button height adjustment mechanism to adjust the distance between the button and the cloth, reversing mechanism to rotate the button to the root winding position, and button solid sewing root winding sewing And a control mechanism for controlling as a sequence of the button sewing machine. 2. The button holding mechanism includes a pair of levers each having a rack, a button holder formed at a lever end, a pinion that meshes with both racks, and a mounting plate that slides the lever at a predetermined relative angle. The sewing machine according to claim 1, comprising: 3. The sewing machine according to claim 2, wherein the holder has a concave holding surface that bisects a line passing through the center of the button and parallel to the sliding of the lever. 4. The sewing machine according to claim 1, wherein a stopper is inserted between the button holding mechanism that is rotated by the reversing mechanism and the sewing machine frame, and the stopper acts when the height is less than the minimum root winding height. 5. The sewing machine according to claim 1, further comprising a fabric holding mechanism for holding the fabric in a double fold at the root winding position. 6. A button sewing machine comprising a mechanism for exchanging a cloth contact for attaching a root wrap button and a cloth presser lower plate for solid sewing in conjunction with an operation of a cloth holding mechanism. 7. The sewing machine according to claim 6, further comprising: a wire connecting the conversion mechanism, the cloth rest and the presser foot lower plate, and means for moving the wire in response to an operation of a tongue of the fabric holding mechanism. 8. A sewing machine capable of sewing with a button, comprising: a button holding mechanism for holding a button; and a reversing mechanism for rotating the button holding mechanism between a solid sewing position and a root winding sewing position. The swing lever 122 and the swing body 124 of the mechanism, and the thread handling body
A button sewing machine characterized in that the base of 123 is disposed below the groove cam 122a and the thread handling triangular cam 124a.