JP2659433B2 - Sewing machine with root wrap - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine with a button wrap.

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

In order to carry out this root winding, as shown in the hand movement diagram of FIG. 6, for example, the button 3 is held perpendicular to the sewing machine bed 1 so that the thread 5 with the button is parallel to the sewing machine bed 1, There is a method of forming a seam of the root winding thread 6 from the start point A to the end point B by moving the needle up and down while moving the button 2 and the button 3 relative to the needle in the XY direction.

As a sewing machine for performing such a wrapping around a button, a conventional button holding device performs buttoning while holding a button from a cloth at a desired distance in a direction perpendicular to a sewing machine bed, and then performs a button holding device. To
2. Description of the Related Art There is known a sewing machine with a root winding button that performs a root winding operation after rotating by 90 degrees. The distance between the button and the cloth held by the button holding device corresponds to the length of the wrapping (FIG. 6L), but this distance can be adjusted by a mechanical adjustment mechanism attached to the button holding device. . The number of root windings is set by a root winding number setting switch on a control plate connected to the CPU. At the time of root winding work, the CPU controls the relative movement in the XY direction between the cloth and the needle based on the signal from the root winding number setting switch and the control program stored in the ROM, and sets the number of root windings by the set number of root winding. Perform winding sewing.

Problems to be Solved by the Invention In the above-described sewing machine with a root-wound button, the distance L between the button and the cloth and the number of root-wounds are independently adjusted and set by the mechanical adjustment mechanism and the setting switch on the control plate. I was

Therefore, if the adjustment and setting are wrong, the hand and the button 3 on FIG.
The relative momentum in the Y direction may not match the root winding length L. If the relative momentum is shorter than the root winding length L, the quality of the product deteriorates.
And the needle may be broken.

Further, when changing the length of the root winding, the number of root windings must also be changed, so that not only the mechanism but also the control plate must be operated, which takes time.

Means for Solving the Problems A sewing machine with a root-wound button according to claim 1 will be described with reference to FIG. 2. A sewing machine bed 1 on which a cloth is placed and an XY table 40 movable in the XY direction with respect to the sewing machine bed. When,
A button holding device 10 mounted on the XY table and capable of holding the button 3 at a desired distance from the cloth 2 at an upper position or a Y-direction position; A drive control means 44 for controlling the driving of the XY table and the sewing machine motor 9 for performing sewing, an adjusting mechanism 20 for adjusting the interval L, and a detecting means for detecting the interval L adjusted by the adjusting mechanism
30; and a Y-direction drive amount instructing unit 73 that calculates a Y-direction drive amount by an XY table based on a signal from the detection unit and instructs the drive control unit.

The sewing machine according to claim 2, further comprising:
Referring to FIG. 1, a sewing machine bed 1 on which a cloth is placed
An XY table 40 movable in the XY direction with respect to the sewing machine bed, and a button 3 mounted on the XY table and
A button holding device 10 capable of holding the button at a desired distance from the cloth 2 at an upper position or a Y-direction position, and an XY table and a sewing machine motor for performing button attachment or root winding sewing at the upper position or the Y-direction position. Drive control means 44 for controlling the drive of the motor 9 and an adjusting mechanism for adjusting the distance L
20, a detecting means 30 for detecting the interval L adjusted by the adjusting mechanism, a setting means 60 for setting the number of root windings n with respect to the basic root winding length 1, and a signal from the setting means and the detecting means. A root winding number commanding means 74 for calculating the root winding number N according to the interval L and instructing the drive control means.

In the present specification, the number of root windings means the root winding yarn 6.
Refers to the number of times surrounding the thread 5 with the button, and the root winding length refers to the distance L between the button 3 and the cloth 2 for root winding sewing. The XY direction is a direction parallel to the sewing machine bed and perpendicular to each other.
The direction refers to a direction parallel to the root winding length L direction.

According to the root winding button attaching sewing machine according to the first aspect of the present invention, the length of the root winding is detected by the detecting means 30, and the Y-direction drive amount of the button holding device 10 is instructed based on the detection signal. The relative momentum in the Y direction between the needle and the button 3 matches the root winding length L.

According to the second aspect of the present invention, if the number of root windings n with respect to the basic root winding length 1 is set by the setting means 60, the root winding length is changed by the adjusting mechanism 20. At this time, the number of root windings N according to the changed root winding length L is automatically determined.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the present embodiment, FIG. 2 is a perspective view showing the present embodiment in a state where buttons are attached, and FIG.

First, the present embodiment will be generally described based on these drawings.

Reference numeral 1 denotes a sewing machine bed on which the cloth 2 is placed and a stitch forming mechanism (not shown) is built in to form a stitch in synchronization with the needle 7.
It is a button to be met to the above-mentioned meeting unit 4.

As shown in, for example, JP-A-63-279873, the cloth 2 is mounted on a cloth holder (not shown) provided on the XY table 40 as shown in FIGS. Is folded in two so that it comes to the edge of the cloth, and is placed below the needle 7.

Reference numeral 10 denotes a button holding device installed on the XY table 40, which is driven by the XY table 40 in the XY direction parallel to the sewing machine bed 1 together with the cloth 2.

The button holding device 10 holds the button 3 horizontally, as shown in FIG. 2, and is disposed above the folded-in cloth edge arranging portion 4 to meet the button on the cloth 2 and the upper position in FIG. As shown in the figure, the button is held vertically and spaced apart from the folded edge of the cloth along the Y-direction so as to be rotatable and held at the Y-direction position where the button is tied to the button-attached thread. The rotation of the button holding device 10 is performed by moving the attachment unit 4 to the rotation center P.
, The distance L between the upper position of the button 3 and the point P in the Y direction position is set to be the same (the desired distance L in the Y direction position from the attachment portion 4 corresponds to the root winding length). ). The distance L can be adjusted by the mechanical adjusting mechanism 20 and can be detected by the detecting means 30.

The XY table 40 is driven in the X direction by a step motor 41 and is driven in the Y direction by a step motor 42.

Reference numeral 44 denotes drive control means. The two stepping motors 41 and 42 and the sewing machine motor are arranged in a state where the button 3 is horizontally held by the button holding device 10 and the interval L is spaced above the joining portion 4 of the folded cloth. 9 by driving and controlling the XY table in synchronization with the vertical movement of the needle 7,
Attach the button to the cloth.

Thereafter, the drive control means 44 rotates the button holding device 10 by 90 degrees by the air cylinder 50, and moves the button 3 from the upper position to the side of the attachment portion 4 of the cloth from the upper position while maintaining the distance L with respect to the cloth 2. To the Y-direction position, the button 3 is held vertically, and the tie-up yarn with the cloth is horizontally arranged, and the XY movement of the XY table is synchronized with the vertical movement of the needle 7, so that the button It is configured to wrap around the welting thread.

Numeral 60 is a setting means for setting a root winding number (basic root winding number) n with respect to a basic root winding length 1 (for example, 2.5 mm),
It is provided on a control plate (not shown). The control plate is provided with a root winding number display means (display) 8 for displaying the root winding number N with respect to the actual root winding length L.

Reference numeral 70 denotes a CPU that constitutes a microcomputer together with the storage means 71. The storage means 71 stores a control program for performing root winding sewing, an arithmetic program described below, and the like, and the CPU 70 performs arithmetic and control according to the program.

 The CPU 70 has the following functions.

A function of receiving a signal from the detection means 30 and instructing the drive control means 43 of the Y-direction drive amount of the XY table 40 calculated according to the calculation program in the storage means 71 (corresponding to the Y-direction drive amount command means 73). Receiving the signals from the means 60 and the detection means 30 and calculating the root winding length L according to the calculation program in the storage means 71
To the drive control means 43 (corresponding to the number of root windings command means 74). In addition, the drive control means 43 based on the control program of the storage means 71 for performing the root winding sewing. Ability to control.

The input unit of the CPU 70 is connected to the detection unit 30 and the setting unit 60, and the output unit is connected to the drive control unit 44 and the display 8.

FIG. 4 is a plan view showing a main part of the present embodiment, and FIG. 5 is a front view of the same. The button holding device 10, the adjusting mechanism 20, and the detecting means 30 of the present embodiment will be described in detail with reference to these drawings.

The button holding device 10 includes a button chuck portion including two holding members 11 and 12 for holding the button 3, and holding members 11 and 12.
And a supporting portion 16 provided with guide grooves 14 and 15 for guiding the pressure. The holding members 11 and 12 are provided with the gear 1 attached to the support 16.
The teeth 18 and 19 meshing with 7 are provided, and by rotating the gear 17, the distance between the two holding members 11 and 12 can be changed.

The adjustment mechanism 20 includes a rack 21 provided on the support portion 16 of the button holding device 10, a first pinion 22 that meshes with the rack 21, and an adjustment dial 24 having a common rotation shaft 23 with the pinion 22. You. The rotating shaft 23 is a mounting member 25
Is provided through. The button holding device 10 is vertically guided by a guide 26 provided on the mounting member 25.

The detecting means 30 includes a second pinion 31 that meshes with the first pinion 22 of the adjustment mechanism 20, and a device 32 that can detect the rotation of the second pinion 31, for example, a bracket 32b fixed to the mounting member 25 with a screw 32a. And the pinion 31 and the common shaft 33
It consists of an encoder that rotates around. The encoder 32 is connected to the CPU 70. Note that a rotary switch or a potentiometer may be used instead of the encoder 32.

Next, the operation of the root winding button attaching sewing machine having the above configuration will be described.

Button 3 by the adjusting mechanism 20 and setting means 60 in advance
L between root and cloth 2 (length of root winding) and number of basic root windings n
Is adjusted to a desired value.

After the button 3 held by the holding device in the state shown in FIG. 2 is attached to the cloth 2 by the needle 7 of the sewing machine,
As shown in the figure, the button holding device 10 is
Rotate 90 degrees. At this time, the interval L between the button 3 and the cloth 2
Is rotated about the straight line P passing through the mating portion 4 on the cloth 2 so that the pressure is maintained.

Next, the XY drive control means 44
The XY table 40 and the sewing machine motor 9 are driven and controlled in order to perform the root winding sewing based on the command from the controller. The XY drive control means 44 is instructed based on the signal from the means 60.

The procedure for determining the root winding number N according to the root winding length L will be described. First, the root winding length L detected by the detecting means 30 is read and the basic root winding number n set by the setting means 60 is set. Is read, the number of root windings N with respect to the root winding length L is calculated based on the following equation (1), and the driving control means 44 is instructed.

N = L × n / l (1) Finally, for confirmation, this root winding number N is displayed on the display 8 on the control board.

As described above, according to the root winding button attaching sewing machine according to the first aspect of the present invention, since the relative momentum in the Y direction between the needle and the button 3 matches the root winding length L, a good root winding can be obtained. Can be performed, and there is no risk of needle breakage.

According to the second aspect of the present invention, since the number of root windings is automatically determined when the number of root windings is changed by the adjusting mechanism, the number of root windings needs to be changed again by the setting means. There is no. Therefore, the setting / adjustment time is reduced.

[Brief description of the drawings]

1 to 5 show an embodiment of a root-wound button sewing machine according to the present invention. FIG. 1 is a block diagram, FIG. 2 is a perspective view showing a state after button attachment, and FIG. FIG. 4 is a plan view of a main part, FIG. 5 is a front view of the main part, and FIG. 6 is a plan view showing a hand movement in attaching a root wrap button. 1 ... sewing machine bed, 2 ... cloth, 3 ... button, 5 ...
Thread with button, 6 Thread of root winding, 10 Button holding device, 20 Adjustment mechanism, 30 Detection means, 40 XY table, 44 Drive control means, 60 Setting means , 73 ... Y
Direction drive amount command means, 74 ... root winding number command means, L ...
… Needle length, l …… Basic root length.

Claims (2)

(57) [Claims] 1. A sewing machine bed provided with a stitch forming mechanism for forming a stitch in synchronization with a needle that moves up and down, and a folded fabric is arranged under the needle and can be moved in the XY direction with respect to the sewing machine bed. An XY table attached to the XY table, holding the buttons horizontally and arranging it above the button adhering position of the folded-in cloth edge and adhering the buttons to the cloth; Each of the cloths at the upper position and the Y direction position of the button are arranged so as to be spaced apart from each other in the Y direction from the folded cloth end so as to be rotatable at the Y direction position for root winding sewing on the button tying thread. A button holding device having the same interval L, drive control means for driving and controlling an XY table and a sewing machine motor for performing button attachment and root winding sewing, and an adjusting mechanism capable of adjusting the interval L. The said Detecting means for detecting the interval L adjusted by the adjusting mechanism; and a Y-direction moving amount command for calculating a Y-direction moving amount of the XY table during root winding sewing based on a signal from the detecting means and instructing the drive control means. A sewing machine with a button-up button. 2. A sewing machine bed having a stitch forming mechanism for forming a stitch in synchronization with a needle that moves up and down, and a folded fabric is arranged below the needle and can be moved in the XY direction with respect to the sewing machine bed. An XY table attached to the XY table, holding the buttons horizontally and arranging it above the button adhering position of the folded-in cloth edge and adhering the buttons to the cloth; Each of the cloths at the upper position and the Y direction position of the button are arranged so as to be spaced apart from each other in the Y direction from the folded cloth end so as to be rotatable at the Y direction position for root winding sewing on the button tying thread. A button holding device having the same interval L, drive control means for driving and controlling an XY table and a sewing machine motor for performing button attachment and root winding sewing, and an adjusting mechanism capable of adjusting the interval L. , Basic Setting means for setting the number of root windings with respect to the root winding length of the root, and calculating the number of root windings according to the interval L based on signals from the setting means and the detecting means during root winding sewing and instructing the drive control means. A sewing machine with a root winding button provided with a winding number instruction means.