JPS5851904Y2 - Embroidery hoop drive device for automatic embroidery machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an embroidery frame driving device for an automatic embroidery machine.

In an automatic embroidery sewing machine that is controlled via multiple servo motors, which are the support mechanism for the embroidery frame, the amount of forward/reverse control for each needle of the servo motor is applied to the embroidery frame support frame in synchronization with the lifting and lowering timing of the needle of the sewing machine. There are two known examples of this mechanism.

However, in the two types of conventional devices, for example, those that are driven while being supported via a pantograph type support mechanism such as an embroidery frame, the support mechanism requires a large device space and is large. The frame tends to rattle and is not necessarily easy to manufacture.

In addition, there is a sewing machine table in which a Y table and an X table are provided on the upper surface of the sewing machine table, and drive mechanisms for driving the X and Y tables are provided on the lower surface of the sewing machine table and are connected by cables between them.

(Japanese Unexamined Patent Publication No. 52-126342) However, in this drive mechanism, only the tensioning of the cable is complicated and adjustment is difficult.

In response to the above-mentioned problems, the present invention aims to simplify the overall size of the drive mechanism.

In order to achieve the above purpose, X-axis drive and Y-axis drive servo motors are arranged at both ends of the frame in opposite directions,
The gist of the structure is that the embroidery frame is placed above and below a string frame that transmits the entire driving force of each servo motor, and that the embroidery frame supporting arm is bent into a U-shape.

With the above configuration, the embroidery frame drive device of the present invention has the following features:
Since the servo motors that drive the image components of the XY orthogonal coordinates are arranged at both ends of the frame, the drive device can be incorporated into the bed of the □ thin, resulting in an extremely compact drive device.

Also. The strings that transmit the driving force are placed separately on the top and bottom of the frame, making it easy to tension the strings and achieving the initial purpose.

In addition, the embroidery hoop support arm is bent into a U-shape.

Since the support arm extends from the back of the sewing machine toward the front, the embroidery support arm does not get in the way when the automatic embroidery machine embroidery frame drive device of the present invention is actually used, and has excellent practical effects. .

To explain the embodiment with reference to the figures, in the example shown in the first figure, 5
The sewing machine 1 is constructed so that the feeding mechanism and the bed section 1a that accommodates the strips are somewhat longer than those of a normal free-arm sewing machine. The main part of the two-axis drive mechanism is built-in, but the bed part 1a is configured to have a horizontally long opening (not shown) on the back side facing the □shin 1. , and from the opening, once this □
Upper front end joint of frame support arms 2 shaped like a pair of bent parallel rod-shaped bodies that protrude to the rear side of the frame, then extend upward and then toward the front again.
aK, configured to attach the embroidery frame 3.

The embroidery frame support drive mechanism will be explained below with reference to FIGS. 2 and 3.

The frame support arm 2 has, in addition to the upper front end joint 2a,
Similarly, in order to integrally grip and connect both bars, a plurality of intermediate joints 2b and 2c and a lower front end joint 2dv are provided.

and lower front end joint) 2d and lower rear end joint 2
The parallel straight rod portion 2e between the
4 through which it is slidably supported in the direction of the straight rod.

In this way, the rider 4 not only holds the frame support arm 2 facing the sewing machine 1 so as to be movable forward and backward.

The arm itself is slidably supported along a pair of parallel rods 5 in a direction perpendicular to the advancing and retreating direction of the frame support arm 2.

The rider 4 is provided with appropriate bushings 6 fitted into the respective penetration portions to ensure smooth sliding between the frame support arm straight bar portions 2e and the parallel rods 5 at the penetration portions thereof. The lid or rider 4 itself is made of a wear-resistant plastic material.

Both ends of the parallel rod 5 are fixedly supported by the frame 7.

The frame 7 has both ends 7a supporting the parallel rods 5 bent outward in a symmetrical manner with a U-shaped cross section, and a front plate 7b connecting the ends 7a together with a frame. A slit 7cY shape is formed to allow the parallel straight bar portion 2e of the support arm 2 to pass through and to allow its lateral movement.

A respective servo motor is attached to each of both ends 7a of the frame.

As for the servo motor used here. It is recommended to use a conventional pulse motor, preferably driven by the output of an open-loop automatic control system.

Both servo motors are supported in a vertical shaft type. First, as shown in Fig. 2, the relationship between the X-axis drive motor 9 supported on the upper shaft end by a capstan roll 8) will be explained. Circulating between an idler roll 10 pivotally supported on the upper surface of the end portion 7a and a capstan roll 8 on the X axis,
A string 11 is stretched, and the string 11 is wound around the capstan roll 8 several times, and one end of the string 11 is tied to the stop post 12VC on the upper surface of the rider 4, and the other end is tied to the stop post 12. The string 11 is always kept under tension due to the tension of the spring 13, which is tied to the free end of the stopped spring 13.

Next, on the opposite frame end 7aK to which the X-axis drive motor 9 is mounted, the Y-axis drive motor 14 is mounted with the shaft end exposed on the lower side opposite to the X-axis circumference, and is mounted vertically. The relevant parts are shown in Figure 3, which is shown in reverse.

A capstan roll 15 is similarly fixed to the shaft end, and a string 16 wound around it several times is connected to a pair of idlers 17 and 18 that are pivotally supported in parallel on the lower surface of the rider 4, and to the frame support arm 2. Idlers 19 and 2 are pivotally supported at each lower part l of the lower front end joint 2d and the lower rear end joint 2c.
0 and each winding.

Also when the rider 4 slides along the parallel rod 5.

Both ends of the string 16 are connected to a pair of wires planted on the underside of the end of the frame where the X-axis drive motor 9 is attached. They are each tied to a stop post 21 via a spring 22 in a form that suppresses slack.

When the capstan roll 15 on the Y axis rotates with the string 16 under emergency tension, the string 16 will move toward the front of the rider 4 as seen from the rider 4, depending on the direction of rotation.
The ratio between the distance between the idlers 17 and 19 on the rear side and the distance between the idlers 18 and 20 on the rear side changes, thereby allowing the frame support arm 2 to move forward and backward toward the rider 40.

However, the strings 11 and 16 used here are preferably stretch-resistant ones, such as Italian cords used in looms, etc., and metal wires may also be used.

Next, with the above configuration, its operation will be described.

As mentioned above, the upper part of the frame support arm 2 is attached to the upper front end joint 2a from the back side of the particularly long lower arm part 1a of the □shin 1, as shown in the first figure. The embroidery frame 3 is used by being attached to the sewing machine 1 in the form of holding a tray from the opposite side to the opening facing the sewing machine 1.
As a control power source for the X-axis drive motor 9 and the Y-axis drive motor 14, which are the driving force means of the embroidery frame drive means configured in this way, although not shown, the XY orthogonal coordinates corresponding to each stitch for embroidery are used. Each of the control data is carried in a suitable recording or storage element, and the data is read out in synchronization with the rise and fall of the thin needle bar (not shown), and the needle
At every period when the embroidery needle goes out above the plane, a control output corresponding to the power of both the X and Y coordinates corresponding to each stitch is applied to both the servo motors 9 and 14 from an automatic embroidery control circuit means (not shown) using a conventional method. It is something.

When both servo motors 9 and 14 are activated in this way, the rotation of the X-axis drive motor 9 gives the effect of pulling the string 11 in either direction via the capstan roll 8.
Accordingly, the rider 4 can move laterally along the lower arm portion 1a while accompanying the frame support arm 2, that is, 1
Cloth feeding operation 4 in the X direction occurs.

Further, the rotation of the Y-axis 1 drive motor 14 similarly causes the string 16 to be pulled in either direction via the capstan roll 15.

As a result, as described above, the frame support arm 2 is moved forward and backward in the direction in which the rider 40 moves forward and backward, that is, in the Y direction.

When both motors 9 and 14 are driven together,
The embroidery frame 3 is moved in the direction in which the XY amphibatic acid components are synthesized, and in this way, the fabric feed for embroidery stitching is automatically controlled for each stitch as the sewing machine needle moves up and down.

Incidentally, a modification of the circulation path of the string is shown in FIG. 4.

That is, a string drive method as shown in FIGS. 4a and 4b is also possible, and the driving force can be increased by implementing double or triple strings.

[Brief explanation of the drawing]

Fig. 1 is a transparent perspective view of an example of the device of the present invention installed on a sewing machine, Fig. 2 is a perspective view of the device of the invention from diagonally from the rear, and Fig. 3 is a perspective view of the device when it is turned upside down. be. FIGS. 4a and 4b are partial schematic views of modified examples of essential parts. 1... Sewing machine, 1a... Bed section, 2
...Frame support arm, 2a...Top front end joint, 2b...Middle joint), 2c...
...Lower rear end joint. 2d...Lower front end joint, 2e...
・Parallel straight bar part, 3...Embroidery frame, 4...
Rider, 5...Parallel rod, 7...
Frame, Ta... Frame end. 8...CX axis) capstan roll, 9...
...X-axis drive motor, 10 ... Idler roll, 11 ... (for X movement) string, 14 ...
・Y-axis drive motor, 15... (for Y-axis) capstan roll 16... (for Y-axis) string, 17~
20...Idler roll.

Claims (1)

[Scope of utility model registration request] Approximately U-shaped frame ends are provided at both ends of the frame, an X-axis drive servo motor is fixed to one end, a Y-axis drive servo motor is fixed to the other end, and both ends of the frame are connected with a rod. , a rider is slidably attached to the rondo, an embroidery frame support arm is extended and fixed from one end of the rider, a string is tied to a stop post attached to the rider, and the shaft of the X-axis drive servo motor is fixed. The string is wrapped around the capstan roll fixed to the frame, and the idler roll attached to the end of the frame is fixed to the rider, and the string is wrapped around the stop post attached to the back side of the X-axis drive servo motor. Tighten the string, wrap it around idlers provided on each side of the rider, wrap the string around an idler provided on the embroidery support arm that can slide in a direction perpendicular to the rondo, and attach one end to the Y axis. An embroidery frame drive device for an automatic embroidery sewing machine characterized by being wound around a capstan roll fixed to the shaft of a drive servo motor.