JPS5929989Y2 - Spreader drive mechanism in smotsuking sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spreader drive mechanism in a smonking sewing machine, which is driven by a stepping motor that guides the top thread.

Traditionally, multiple top threads were laid out in a zigzag pattern on the outer surface of women's clothing such as blouses and dresses, and these threads were then sewn onto the fabric using needle thread. A sewing machine is equipped with, for example, three spreaders that are movable back and forth in a direction perpendicular to the direction of movement of the fabric to guide the cover thread in front of the sewing needle, and these spreaders are attached to the main shaft of the sewing machine. A directly connected cam plate (usually a disk-shaped metal plate 5 with a tracing groove 2 corresponding to the pattern of the top thread as shown in FIG. 1) and a sliding groove 2VC of this cam plate 1 The sewing machine is driven by a drive motor on the sewing machine main body side through a guide pin 3 that moves in contact with the sewing machine and a connecting link that connects the guide pin 3 and the above-mentioned spreader.

Therefore, the movement of the spray saw is uniquely determined by the tracing motion of the guide pin 3 following the tracing groove 2 provided on the cam plate 1vc, and the pattern drawn by the top thread is determined by the shape of the tracing groove 2 provided on the cam plate 1. It is now possible to do so.

Therefore, when changing the pattern of the top thread, it is necessary to replace the cam plate each time, and it is necessary to prepare a large number of cam plates according to the setup time required to change the cam plate and the pattern to be used. etc., were a major obstacle to reducing manufacturing costs.

In addition, the shape of the tracing groove that can be carved on the cam plate is mechanically limited.In other words, if the curve that makes up the tracing groove changes suddenly, the guide pin will not be able to follow the tracing groove and will break. There is also a risk.

Therefore, it is not possible to use a cam plate that causes sudden changes in the shape of the tracing groove, and the range of the pattern drawn by the top thread is also limited in thickness.

In addition, in devices that use this type of cam plate, the pattern drawn when the cam plate rotates once corresponds to one cycle of the decorative pattern.
There were restrictions on the diversification of decorative patterns, such as the inability to draw patterns with longer cycles.

The present invention was developed in view of the above circumstances, and it overcomes all the drawbacks of this type of sewing machine using the conventional cam plate mentioned above, and also incorporates linear stitching into the drive source for driving the spresogger. By using a motor, the drive mechanism is simplified, and the present invention provides a spreader drive mechanism for a smonking sewing machine that is less likely to malfunction and is inexpensive.

Hereinafter, one embodiment of the present invention will be specifically described with reference to FIGS. 2 to 5.

Figure 2 shows the external view of the Smon King sewing machine, and shows 1
Reference numeral 0 designates a bed constituting the main body of the sewing machine, and reference numeral 11 designates an arm constituting the main body of the sewing machine. A large number of sewing needles 13 are attached to the lower end of a needle bar 12 that projects downward from the tip of the arm 11. The planted needle stock stand 14 is firmly attached.

In addition, three spreaders guiding the top thread to the front side of the sewing needles 13...
It is provided so that it can freely move back and forth in the direction perpendicular to the .

As shown in Fig. 3, these souffle saucers 15, 16, and 17 are directly driven by linear stepping motors 1B and 19vC, whose rotor side performs linear motion, and the spreader 15 located at the upper stage is driven by linear stepping motors 1B and 19vC. The tips of the arms 15a and 15b protruding from both ends are fixed via screws 25, 25 to brackets 24° 24 fixed to both ends of the shaft 71230, which is supported by the support frame 22 so as to be able to slide horizontally. .

Further, a bracket 26 is fixed to one end of the shaft 23, and a linear stepping motor 18 is attached to the bracket 26.
The output shaft 18a of the two is directly connected.

Furthermore, a bracket 29 is fixed to both ends of a shaft 28, which is slidably supported in the horizontal direction by support frames 22 at the tips of arms 16a and 16b protruding from both ends of the "spreader" 6 located in the middle stage. 29 through screws 30 and 30.

Furthermore, the soufflé souffle 17 located at the lower level is supported by a support frame 22 at the tips of arms 17a and 17b protruding from both ends thereof so as to be slidable in the horizontal direction. 32
It is fixed to via screws 33 and 33.

A bracket 34 is attached to one end of the shaft 31.
Then, the linear stepping motor 1 is attached to the platen) 34.
9 output shafts 19a are directly connected to each other.

In addition, ranks 36 and 37 are carved in side box parts adjacent to each other located in the middle part of the shafts 2B and 31, and a pinion 38 is inserted between these racks 36 and 37, so that one shaft When the shaft 28 moves, for example, to the right, the shaft 31, which is an external force, moves to the left, which is a symmetrical operation.

That is, by the reciprocating motion of the linear stepping motor 19, the middle and lower soufflé saucers 16 and 17 are caused to reciprocate symmetrically with respect to each other.

Also, each of the soufflés 15, 16, 17Tf- has through holes 15a..., 16a... to insert the top thread in the width direction.
. , 17a . . . are bored at a predetermined pitch.

Reference numerals 39 and 40 denote presser metal fittings for preventing each spreader 15, 16, and 17 from lifting up, and are fixed via screws 41 and 41 to the upper surface of a presser plate (not shown) that presses the fabric.

In addition, in Fig. 2, 42 is a thread tension regulator group for the upper decorative thread, 43
44 is a thread tension device group for the needle thread, and 44 is a thread tension device group for each looper thread. It is supplied to each of the soufflé sauces 15, 16, and 17 through gaps formed between the four guide bars 45.

By the way, as shown in FIG. 4, the linear stepping motors 18 and 19 are driven and controlled by a control device 50 composed of a microcomputer or the like. Between motor drivers 51 and 5
2 is inserted to supply each linear stepping motor 18 and 19 with a drive current according to a pulse signal output from the control device 50.

Reference numeral 53 denotes a detection switch for detecting the bottom dead center position or top dead center position of the sewing needle 13, and is composed of a non-contact switch, etc., and this non-contact switch is connected to a boolean 1154 directly connected to the main shaft. It is arranged near the outer periphery and detects the passage of an iron piece 55 or the like fixed to the pulley 54 and outputs a detection signal to the control device 50.

In other words, each time the control device 50 receives a detection signal from the detection switch 53, it sequentially outputs information regarding the decorative pattern programmed and stored in the control device 50 as a pulse signal to the motor drivers 51 and 52. Therefore, in the storage section of the control device 50, information regarding a large number of decorative patterns is converted into a subroutine in the form of the moving direction and moving amount of each spreader 15, 16, 17 for one stitch of each sewing needle 13... and is remembered.

Incidentally, when selecting a decorative pattern, a program related to an arbitrary decorative pattern can be selected by inputting data such as a preset code number into an input device such as a keyboard provided in the control device 50.

According to such a configuration, the control device 5
By inputting data such as a code number to select a desired decorative pattern from an input device such as a keyboard provided at 0, a subroutine related to the decorative pattern corresponding to the code number is called as an execution program.

Therefore, when the sewing machine starts operating, the control device 50 sends each sprayer 15. in synchronization with the movement of the sewing needles 13.
The direction and amount of movement of 16.17 are sequentially output to the motor drivers 51 and 52 in the form of pulse signals, and each motor driver 51 and 52 applies a drive current according to the input pulse signal to each linear stepping mode 18.
and 19, each spreader 15, 16 .
17 are sequentially driven according to the selected program.

By the way, in the present invention, linear stepping motors 18 and 19 are used as drive sources for driving the spray saws 15, 16, 17, and the linear stepping motors 15, 16, 17
, 16, 17 are directly driven, so there is no need for a power conversion mechanism to convert rotational motion into linear motion, unlike those using conventional stamping motors, and the structure of the drive mechanism is simple. It is easy to use, has few failures, and can be manufactured at low cost.

Furthermore, since the power conversion mechanism can be eliminated in this way, the frictional resistance between the drive source and the spreader flaps 15, 16.1 is reduced, and a drive mechanism with less loss can be obtained.

Furthermore, since the mass of the entire drive mechanism can be suppressed, the moment of inertia is reduced, and a drive mechanism with excellent followability can be obtained.

In addition, with conventional drive devices that require a power conversion mechanism, accurate sewing may not be possible due to gear bank lash, etc., but in the present invention, each spreader 15, 16, 17
Since the sewing machine is directly driven by the linear stepping motors 18 and 19, it is possible to perform sewing with even higher precision.

In addition, there is no need to install a cam plate like in conventional Smonking sewing machines, and the selection of decorative patterns can be done easily and quickly using an input device such as a keyboard. There is no need for setup time at all, and there is no need to prepare a large number of cam plates in advance, making it possible to significantly reduce the manufacturing cost of sewn products.

In addition, since a cam plate is not used, there are no mechanical constraints when designing a cam plate as in the past, and a wide variety of decorative patterns can be designed freely.This greatly contributes to the diversification of decorative patterns. It is something that can be contributed.

Furthermore, since the number of decorative patterns that can be sewn is determined by the storage capacity of the storage section provided in the control device 50, the number of decorations M can be arbitrarily increased by increasing the storage capacity.

Furthermore, in the past, one period of the decorative pattern corresponded to one round of the tracing groove formed on the cam plate, making it difficult to construct a pattern with a long period on ng. As shown in FIG. 5, the decorative pattern of one cycle can be extended arbitrarily.

Note that the distance t between each dot on the curve corresponds to one sewing needle.

In addition, with the conventional cam plate type, when changing the decorative pattern, it is necessary to design and manufacture a new cam plate, which takes a considerable number of days to deliver the cam plate, and increases production costs.
Although there have been various problems, with this device, it is easy to change the program, and the decorative pattern can be corrected or changed instantly and at low cost, such as when necessary.

In addition, with the conventional cam plate type, even if the designer created a new decorative pattern, it took several days to manufacture the cam plate, so it was not possible to immediately check the finished product by sewing it. By equipping the control device 50 with a display device and designing an interactive system, the designer can directly create decorative patterns while actually operating the sewing machine.

Furthermore, since the decorative pattern can be changed easily and instantly, it is possible to continuously mix and sew many types of patterns while changing them as needed, even with one sewing machine.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a cam plate used in a conventional Smonking sewing machine, Fig. 2 is an overall perspective view of the Smonking sewing machine, Fig. 3 is a perspective view showing an embodiment of the present invention, and Fig. 4 5 is a block diagram of the control section of the same embodiment, and FIG.
It is a schematic diagram showing a pattern for a period. 15.16.17... Spretsuda, 18.19...
Linear stepping motor, α... direction of fabric movement.

Claims (1)

[Scope of utility model registration request] A spreader drive mechanism in a smonking sewing machine, characterized in that a linear stitching motor directly drives a spresuge, which is provided so as to be movable back and forth in a direction perpendicular to the direction of movement of the fabric to guide the top thread. .