JPS642702B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a zigzag stitch swing device for a sewing machine. In particular, the present invention relates to a device for sewing a string-like member onto a fabric using a zigzag stitch in an industrial embroidery sewing machine.

(Prior art) The devices conventionally used as zigzag stitches zigzag the fabric by first moving a taut embroidery frame or hoop along the X and Y axes in synchronization with the movement of the needle that moves up and down. She was sewing.
There are two ways to move the embroidery frame from side to side: manual or electric; however, in industrial embroidery machines, the embroidery frame can be moved electrically in the Y-axis and X-axis directions to perform zigzag stitches and other stitches. A pattern was formed on the cloth.

Secondly, there is a device that forms zigzag stitches on fabric by swinging the needle itself from side to side.

In any of the above-mentioned devices, it is impossible to automatically sew the string-like member to the fabric using the zigzag stitch method, and the sewing method has mainly relied on manual methods.

(Problems to be Solved by the Invention) Even if the above-mentioned two methods of zigzag stitching are adopted in an industrial embroidery sewing machine, it is not possible to automatically and continuously sew the string-like member onto the fabric. There were problems such as the work being inefficient.

(Means for Solving the Problems) The present invention provides a device that makes it possible to automatically and continuously sew a string-like member to a embroidery frame using a zigzag stitch.

Means for automatically and continuously performing zigzag stitches can be broadly classified into two types. The first is a mechanism that causes the differential lever 58 to move up and down. In order to swing the connecting shaft 56 on which the differential lever 58 is attached, the cam lever 20 alternately fits into and slides in the grooves of the first cam 6 and the second cam 8 provided facing the sewing machine drive shaft 4. In order to cause the pins 24 and 26 on both sides to swing over time, a pair of solenoids 30 and 32 are used as actuators, and the pins 24 and 26 move by alternately fitting into the grooves of the cams 6 and 8 over time. 26
The movement of the cam lever 20 is converted into the swinging movement of the ball spline 18 and the spline shaft 16 into which the cam lever 20 is fitted and fixed, and the movement of the spline shaft 16 is converted into the swinging movement of the spline shaft 16.
4. This is a mechanism that generates vertical movement in the differential lever 58 by transmitting the signal to the connecting shaft 56 via the square rail 46, the square ball 48, and the driven lever 50.

The second is a swing device according to the present invention. This device is a swing device that converts the vertical movement of the differential lever 58 into a horizontal swinging movement. An annular leg part 74 fixed to the end of a vertically movable differential rod 62 connected to the differential lever 58, and an annular head part 78 connected to the annular leg part 74 whose vertical movement is controlled by the head part and the rotating outer cylinder part 7.
The L-shaped arm 82 is pivotally connected to the trunk 80 of the second embodiment, and the L-shaped arm 82 is converted into a horizontal swinging movement together with the guide plate 88 and the cord thread guide rod 86 via a connecting lever 84 installed on the L-shaped arm 82. By using the swing device configured as above, the vertical movement of the differential lever 50 is converted into a horizontal swinging movement.

(Function) By using this swing device, the string-like member C drawn out from the bobbin 134 housed in the bobbin frame 132 attached to the side surface of the body 80 of the rotating outer cylinder 72 can be moved to the thread guide 96, Passing through the tension plate 84 and the thread guide 98, the cord is pulled out from the thread guide pipe 94 of the thread guide bar 86, and the guide pipe 94 is pulled out by the horizontal swinging motion of the L-shaped arm 82 and the thread guide bar 86.
Notch guide hole 95 and nipple 118 opening in the direction
Below the needle thread α and the bobbin thread β are sewn to form a zigzag stitch on the fabric W attached to the embroidery frame 142.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings. As a device related to the present invention, there is a drive device that generates a vertical swing motion of a differential lever for a zigzag stitch motion. The device of the present invention is a swing device that converts the vertical movement of the differential lever into a horizontal swinging movement in conjunction with this.

In the following, the differential lever drive device related to the present invention will be explained first, and then the swing device according to the present invention will be referred to.

In FIG. 5, a sewing machine drive shaft 4 is rotatably mounted on a frame 2, and a first cam 6 and a second cam 8 are provided on the drive shaft with cam grooves 10 and 12, respectively, on the inside facing each other. It is inserted and fixed. The cam grooves 10 and 12 are provided relative to each other so as to form a circular circle with the sewing machine drive shaft 4 as the center. A ball spline 18 is fitted into a spline shaft 16 which is mounted on the upper end of the frame 2 and has a long groove 14.
Further, a cam lever 20 is fitted and fixed on the outer periphery thereof.
Pins 24 and 26 are attached to both ends of a shaft 22 that is fitted and fixed to the leg portion 21 of the cam lever 20. Lever holding arm 2 that holds the ball spline 18 from both ends
8 is a support shaft 3 installed on support members 34 and 36 of a pair of first solenoid 30 and second solenoid 32.
8 is fitted. 40 is another support shaft. 42 is a solenoid base. A drive lever 44 is fitted and fixed to one end of the spline shaft 16, and a square rail 46 containing a square ball 48 is attached to one side of the lever. A slidable pin 52 is connected thereto. The other end of the driven lever 50 is connected to a connecting shaft 56 that is mounted on a frame 54 of the sewing machine that is provided adjacent to the zigzag box.
Fixed. A differential lever 58 is fitted and fixed to the connecting shaft 56, and a balance 60 is fitted and inserted in contact with this. When either one of the pair of solenoids 30, 32 operates alternately, the support shaft 38 moves in the direction of the arrow, and in response, the lever holding arm 28 fixed to the support shaft 38 moves in the same direction together with the ball spline 18. do. When the ball spline 18 changes its position along the long groove 14 of the spline shaft 16, the cam lever 20 also moves, and its pins 24, 26 are rotated in response to the operation of the sewing machine drive shaft 4. 2 cam grooves 10, 12 of either cam 8
Since the spline shaft 16 contacts and slides within the cam groove, the spline shaft 16 rotates in the direction of the arrow. This movement is controlled by a driven lever 50 via a drive lever 44 fixed to the spline shaft 16, a square ball 48 of a square rail 46, and a pin 52.
This results in a rocking motion, and the connecting shaft 56 is rotated in the direction of the arrow. Therefore, the differential lever 58 attached to the connecting shaft 56 makes reciprocating up and down movements.

FIG. 1 is a side view of a swing device according to the present invention. The differential rod 62 is attached to an upper frame 64 and a lower frame 66 of a sewing machine frame 54 so as to be able to move up and down, and a protrusion 70 of a lever driving ball 68 fixed to the upper end of the differential rod 62 is fitted into the differential lever 58. .

An annular leg 74, which will be described later, is fixed 76 to the end of the differential rod 62 that passes through the lower frame 66.

A rotatable cylinder outer cylinder part 72 (hereinafter simply referred to as an outer cylinder part or a rotating outer cylinder part) with a gear 71 attached to the end thereof is movable in the axial direction with respect to a body part 80 and rotates integrally with the body part 80. It consists of a removably fitted annular head 78. The details will be described later. In addition, since only the annular head 78 is rotatably supported by the annular leg 74, the annular leg 74 is fitted into a groove bored in the outer periphery of the annular head 78, for example.

Although the gear 71 is not shown, the rotating outer cylinder part 72
It meshes with a gear 73 of a device that restricts the rotation of.

A slider 102 mounted on the body portion 80 of the outer cylinder portion is slidably engaged with a slit 100 formed in the annular head portion 78 . Therefore, the annular head 78 is
It is movable in the axial direction by a predetermined distance, that is, the length of the slit 100, relative to the body 80 of the outer cylinder, and is rotatable together with the body 80 of the outer cylinder. A connecting lever 84 is installed so as to be movable in the direction of the arrow, spanning one side of the annular head 78 and the end of an L-shaped arm 82 rotatably attached 83 to the body 80 of the outer cylinder. A thread tension disc 84 is provided on one side of the L-shaped arm 82, and a guide plate 88 with a cord thread guide rod 86 is mounted on the flat part thereof. Cord thread guide rod 8
A guide foot 92 having a hole 90 is attached to the end of the thread 6, and a removable thread guide pipe 94 is provided in the hole. Reference numeral 96 is a first thread guide, and 98 is a second thread guide. A part of the slit 100 of the annular head 78 has a slider 1 fixed to the body 80 of the rotating outer cylinder.
02 is slidably disposed, and as described later, when the annular head 78 is pressed by the annular legs 74, the annular head 78 moves in the direction of the outer cylinder body 80 within the remaining slit. be pushed down. A coil spring 106 is provided between the differential rod 62 to which the locking ball 104 is fixed and the lower frame 66. A needle bar 112, which has a thread hole 108 in its upper part and a needle 110 attached to its lower end, moves vertically within a cylinder 116 and a nipple 118 connected thereto by the operation of a drive device (not shown) connected to a drive ball 114. Upper thread α is thread hole 108
The needle passes through a through hole provided in the needle bar 112 and is drawn out from the needle hole. Reference numeral 120 is a cylinder lifting rod connected to the cylinder 116 via a coil 112 and an L-shaped lifting arm 124 having an annular ring 123 fitted into a cylinder lifting ring 126 provided at the end of the cylinder. The upward movement of the arm 124 is configured to pull the cylinder 116 upward along with the nipple 118.

A pair of arms 12 are provided on the outside of the body portion 80 of the rotating outer cylinder portion 72.
A bobbin frame 132 having a diameter of 8,130 (130 is not shown) is fixed, and a bobbin 134 is mounted within this frame. 135 is a bobbin rotation stopper. 1
Reference numeral 36 designates a locking arm that is installed between the body 80 of the rotating outer cylinder and the nipple 118, one end of which is fixed to the bobbin frame 132, and the threaded portion 137 of the other end engaged with the groove 119 of the nipple 118. The cord C wound around the bobbin 134 passes through the first thread guide 96, the thread tension plate 84, the second thread guide 98, the thread guide rod 86, the thread guide pipe 94, and the direction of the thread guide pipe 94. Notch guide hole 95 opened in a direction perpendicular to the needle 110
It extends below the nipple 118 which has a .

Next, the fabric W stretched on the stitching frame 142 is placed on the operating table provided below the nipple 118, and the bobbin thread β pulled out from the hook 144 below the working table is synchronized with the vertical movement of the needle. It works together with the needle thread α to form a seam.

The oscillating movement of the differential lever 58 by means of the differential lever drive has already been explained. The downward movement of the differential lever 58 causes the differential rod 62 to move downward, causing the differential rod 62 to move downwardly.
is pulled downwardly through the lower frame 66 against the coil spring 106, so that the annular leg portion 74 fixed thereto is pulled up by the annular head fitted into the body portion 80 of the rotating outer cylinder portion. The slider 102 provided on the body 80 of the outer cylindrical portion 78 is pushed down together with the slit 1 of the annular head 78.
This is done within the range of sliding within 00. As a result, the connecting lever 84 moves rightward (toward FIG. 2) to the L-shaped arm 82 which is pivoted 83 to the outer cylinder body 80.
move with Therefore, the cord thread guide rod 86 attached to the end of the L-shaped arm 82 via the guide plate 88 is similarly shifted to the right and maintains a vertical position substantially parallel to the nipple 118. Next, differential lever 5
When 8 is pushed upwards, the aforementioned related members undergo a completely opposite movement and return to their original positions. That is, each of the main related members makes a reciprocating motion in the direction of the arrow shown in the figure, and as a result, the guide foot 9
2. The cord thread guide rod 86, which has a thread guide pipe at its end, makes a swinging motion as indicated by the arrow, and the cord C pulled out from the bobbin 134 as shown in FIG.
(indicated by a chain line) passes through the yarn guide pipe 94,
When the cord C is sewn to the fabric W stretched on the stitching frame 142 by upper thread α and lower thread β below the nipple 118 having the notched guide hole 95, the cord thread guide rod 86 guides the cord C to the left and right with respect to the needle 110. By swinging it, a zigzag stitch pattern can be sewn continuously.

Although not shown, the sewing machine according to the present invention is provided with a control device using a central control box, and the needle bar 11
0, the cylinder 116, its rotary outer cylindrical portion 72, the sewing machine drive shaft 4 to which the pair of cams 6 and 8 are mounted, the stitching frame 142 for sewing the fabric, and other connecting members are operated synchronously.

In the present invention, modified zigzag stitches can also be performed using various zigzag stitch patterns, as shown in FIG.

(Effects) In the present invention, a zigzag stitch can be easily and automatically applied to a string-like member by using a swing device that converts the movement of an operating lever that moves up and down by a drive device into a horizontal swinging movement. .

[Brief explanation of the drawing]

FIG. 1 is a side view of a swing device according to the present invention.
FIG. 2 is a side view of the swing device as seen from the direction of arrow X in FIG. FIG. 3 is a detailed view showing the engagement between the head and body of the rotating outer cylinder. FIGS. 4A and 4B show zigzag stitch patterns, and A' and B' show zigzag stitches according to the patterns. FIG. 5 is a schematic side view showing the configuration of a differential lever drive device related to the present invention. 6A is a plan view showing the inside of the first cam in FIG. 5, and FIG. 6B is a sectional view. 7th
Figure A is a plan view showing the inside of the second cam. B is a cross-sectional view. FIG. 8 is a plan view of the solenoid member holding structure. 56... Connection shaft, 58... Differential lever, 62...
Differential rod, 71... Gear cylinder, 72... Outer cylinder part, 73... Gear, 74... Annular leg part, 78...
Annular head, 80... Outer cylinder body, 82... L-shaped arm, 84... Connection lever, 86... Cord thread guide bar, 92... Guide foot, 94... Thread guide pipe, 9
5... Notch guide hole, 96... First thread guide, 98...
...Second thread guide, 100...Slit, 102...
Slider, 110... Needle, 112... Needle bar, 11
6...Cylinder, 118...Nipple, 119...
... Nipple side groove, 136 ... Locking arm, 137 ...
screw.

Claims (1)

[Scope of Claims] 1. An annular leg fixed to the end of a differential rod that is movable up and down in conjunction with a differential lever that is driven to swing up and down by a drive device is attached to the body of the rotating outer cylinder. The annular head is rotatably attached to an annular head that is rotatably movable in the axial direction for a predetermined distance and integrally with the annular head, and is rotatably connected to the body of the rotating outer cylinder. A zigzag stitch swing device for a sewing machine, wherein a connecting lever is installed between the L-shaped arm and the annular head, and a cord thread guide rod equipped with a guide leg is attached to the rotatable L-shaped arm. 2. The zigzag stitch swing device for a sewing machine according to claim 1, wherein the slider provided on the body of the outer cylinder is slidable within the slit groove provided on the annular head. 3. A zigzag stitch swing device for a sewing machine according to claim 1, which has a cord thread guide rod having a thread guide pipe provided on a guide foot provided at an end thereof. 4 The movement of the differential rod, which moves up and down in conjunction with the movement of the differential lever, is transmitted to the L-shaped arm pivoted to the body of the outer cylinder, and the annular head is moved so as to horizontally swing the L-shaped arm. Department and L
A zigzag stitch swing device for a sewing machine according to claim 1, comprising a connecting lever installed at an end of the character-shaped arm.