JPS63105785A - Automatic sewing machine - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an automatic sewing machine that can sew a series of stitches including curved and rectangular stitches on a part-ef-to-stitch.

[Prior Art] Fig. 4 is a configuration diagram showing a conventional automatic sewing machine. In Fig. 4, (1) is a base, (74) is a needle bar,
5) is a needle bar holder provided in the middle of the needle bar, (7) is a needle provided at the tip of the needle bar (74), (8) is a needle bar crank that provides reciprocating motion to the needle bar (74), (9) is a balancer,
(73) is the upper axis, (71) is the vertical axis, (72) is the lower axis, (
70a).

(70b) is a bevel gear that interlocks the upper shaft (73) and vertical shaft (71), (70c) and (70d) are bevel gears that interlock the vertical shaft (71) and lower shaft (72), and (30) is a bevel gear that interlocks the upper shaft (73) and the vertical shaft (71). Lower axis (7
(2) is a hook that forms the seam provided at the tip of (18) is a sliding plate that sends out the cloth, (17) is a cloth presser foot that presses the cloth, (
19) is an XY table that feeds the cloth back and forth and left and right, (77)
) is a control device that determines the feeding direction of the XY table (17), and (12) is a control device that directs the power of the main motor (33) to the upper shaft (73).
), and this V-belt (12) connects the sewing machine pulley (11) installed on the upper shaft (73) and the motor (
Motor pulley (1) installed on the output shaft (33a) of
3) It's been a long time since I've been in the middle of a while.

(76) is an arm that accommodates and supports the upper shaft (73).

Next, the operation will be explained. The main motor (33) rotates the upper shaft (73) via the motor pulley (13), V-belt (12), and sewing machine pulley (11). Upper axis (73
) rotation balancer (9), needle bar crank (8)
With this movement, the needle bar (74) is fixed to the needle bar holder (75).
moves up and down. Furthermore, due to the rotation of the upper shaft (73), rotational force is transmitted to the vertical shaft (71) via the bevel gears (70a) and (70b), and this rotational force is transmitted to the vertical shaft (71) through the bevel gears (70a) and (70b).
0c) and (70d) to rotate the lower shaft (72). For this reason, the hook (30) fixed to the lower shaft (72)
) rotates at a constant cycle and forms stitches together with the reciprocating movement of the needle (7).

On the other hand, the work cloth (not shown) is sandwiched between the sliding plate (18) and the presser foot (17), and is fed out according to the commands of the control device (77) that determines the cloth feeding direction of the XY table (19), and the stitches are form a pattern.

[Problems to be Solved by the Invention] Since the conventional automatic sewing machine is configured as described above, the fabric to be processed is moved forward and backward by the fabric feeding mechanism consisting of the fabric presser foot, slide plate, and XY table provided on the sewing machine. When transferred from side to side, depending on the direction in which the fabric is being transferred, either hit-stitch or parts-ef-to-stitch is used, depending on where the exit of the thread passed through the needle or the thread exiting from the bobbin is relative to the needle. Since seams are formed, hit stitch has a poor appearance compared to parts-efto stitch, and has the problem of being unsuitable for various decorative stitches.

This invention was made to solve the above-mentioned problems, and it is possible to form a series of stitches in a part-eft stitch, and the movements of the needle and hook are connected by mechanical means, so that the timing of each stitch can be adjusted. To provide an automatic sewing machine that can eliminate misalignment, have an extremely small number of drive systems, and simplify control of a series of sewing operations.

[Means for Solving the Problems] The automatic sewing machine according to the present invention connects the needle bar drive unit and hook drive unit by mechanical means, and synchronizes the moving direction of the XY table for transporting the work cloth. The above-mentioned units are rotated at the same time so that the needle and hook are always oriented in the same direction as the direction in which the work cloth is transported.

[Function] The automatic sewing machine of the present invention has a needle bar drive unit and a rotary hook drive unit so that the direction of the needle and rotary hook in each unit is always in the same direction as the direction in which the workpiece cloth is transported. All eyes are made of parts with excellent appearance.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, (1) is the base, (2) is the arm, and (3)
is a needle bar, (4) is a collar that is fixed to the needle bar (3) with a flat screw (50) and maintains the vertical position of the needle bar, and (5) is a collar that is sandwiched between the collar (4) and is attached to the needle bar. (6) is the needle bar drive unit, (7) is the needle bar (3) that reciprocates up and down.
), (8) is a crank rod that provides reciprocating motion to needle bar (3), (9) is a balancer, (10
) is the upper shaft with the crank part (10a), (11) is the sewing machine pulley provided on the upper shaft (10), and (12) is the sewing machine pulley (11) and the motor pulley provided on the output shaft (33a) of the main motor (33). (13) V-belt suspended from (
14) is an intermediate spur gear that drives the needle bar drive unit (6), and (15) is an intermediate spur gear that is provided on the drive shaft (16).
Spur gear meshing with 14), (17) is the presser foot, (18)
(19) is a sliding plate (not shown) on which the processed cloth is placed; (19) is an XY table (not shown) that determines the transport direction of the processed fabric; (2G)
is a crank rod, (21) is a swinging arm that swings around the shaft (21a), (22) is a spur gear provided on the drive shaft (16), and (23) meshes with the spur gear (22). The drive gear (24) is a motor that drives the needle bar drive unit (6) and hook drive unit (28), and its output shaft (24a)
) has the drive gear (23).

(25) is the spur gear of the hook drive unit (28) that meshes with the drive gear (23); (26) is the collar that is fixed to the hook shaft (27) and transmits the vertical movement of the swinging arm (21); (29)
) is a crank rod, (30) is a hook, (31) is a crank that converts the reciprocating motion of the crank rod (29) into rotational motion and transmits it to the hook (30), (32) is a speed increasing gear train,
(34) is a control device that controls the above series of operations.

FIG. 2 is a detailed diagram showing the needle bar drive unit (6),
In Fig. 2, ('3a) and (3a) are flat parts provided on both sides of one end of the needle bar (3), and (51) is the flat part (
3a), (3a) is a slider pressed by a helical spring (52), (53) is a stopper for the helical spring (52), and (54) is integrated with the needle bar drive unit (6). This is a guide.

Next, the operation will be explained. The rotational force of the main motor (33) is applied to the motor pulley (13), V-belt (12), and sewing machine pulley (11) according to signals from the control device (34) to obtain a series of pre-programmed sewing patterns.
is transmitted to the upper shaft (10) via. The rotational force of the upper shaft (10) applies reciprocating force to the needle bar holder (5) through the balancer (9) and crank rod (8), and the collar (4)
is transmitted to the needle bar (3) as a reciprocating motion.

On the other hand, the crank rod (20) connected by the crank part (10a) of the upper shaft (10) generates a swinging motion in the swinging arm (21), and through the collar (26) having a spherical shape on one side, The hook shaft (27) is reciprocated on the needle bar movement axis. Also, crank rod (29), crank (31)
, the needle bar (
3) Gives rotational motion synchronized with.

Next, apply the work cloth (not shown) to the presser foot (17) and the sliding plate (1).
8), and is moved in synchronization with the needle (3) and hook (30) on the upper surface of the base (1) by an XY table (19) that can be moved back and forth and left and right according to the program of the control device (34).

At this time, in synchronization with the transport direction of the XY table (19),
When the motor (24) that rotates the needle bar drive unit (6) and hook drive unit (28) is driven according to the program of the control device (34), the output shaft of the motor (24) (
The spur gear (23) fixed to 24a) rotates, and the hook drive unit (28) rotates about the needle bar movement axis. At this time, the hook shaft (2) of the hook drive unit (28)
7), the swinging arm (21) is sandwiched between the collar (26) which is coaxial with the needle bar (3) and has a spherical shape on one side.
21) performs a swinging motion, the rotary hook drive unit (28) can obtain a smooth rotational motion.

On the other hand, the spur gear (22) fixed to the drive shaft (1δ) meshes with the spur gear (23), and the spur gear (15) meshes with the intermediate gear (14).
) and rotates the needle bar drive unit (6) in synchronization with the hook drive unit (28). At this time, the slider (51) pushes the flat part (3a) of the needle bar (3) under the force of the helical spring (52).

Since the needle bar (3) is in pressure contact with the needle bar (3a), the needle bar (3) is also rotated. Further, the needle bar (3) is also slid in the vertical direction by the slider (51) and the flat parts (3a), (3a) of the needle bar (3), and the needle bar (3) is reciprocating and rotating. You can do both types of exercise.

As mentioned above, according to the transfer of the XY table (19),
The synchronized movement of the reciprocating movement of the needle bar (3) attached to the needle bar drive unit (6) and the rotational movement of the hook (30) attached to the hook drive unit (28), and the rotation of the needle bar (3). By synchronizing the dynamic movement and the rotational movement of the rotary hook (30), part-ef-to-stitch is completed in a series of sewing operations.

In the above embodiment, gears (15), (14), (6) and a gear (22) are used to rotate the needle bar drive unit (6) and hook drive unit (28) from the motor (24).
Gear trains (23) and (25) were provided, but instead of these gear trains, toothed belt wheels (62) and (6
3), belt (64) and toothed belt wheel (65), (6
6) and a belt (67) may be provided.

[Effects of the Invention] As described above, according to the present invention, the drive source that moves the needle bar up and down and the drive source that rotates the hook are the same, and the timing of the needle and hook, which has a large effect on the sewing tension, is not changed. In addition, an interlocking device is provided to move the needle bar drive unit and rotary hook drive unit synchronously around the reciprocating axis of the needle.
Since the needle and the rotary hook are always oriented in the same direction as the feed direction of the work cloth transferred by the Y table, it is possible to form all the stitches in a series of parts. .

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an automatic sewing machine according to an embodiment of the present invention, FIG. 2 is a detailed diagram of a needle bar drive unit, and FIG. 3 is a configuration diagram showing an automatic sewing machine according to another embodiment of the invention. , FIG. 4 is a block diagram showing a conventional automatic sewing machine. In the figure, (6) is a needle bar drive unit, (7) is a needle,
(16) is the drive shaft, (14) and (15). (22), (23), (25) are gears, (
19) is the XY table, (20) is the crank rod, (
21) is a swing arm, (24) is a motor, (28) is a hook drive unit, (30) is a hook, and (34) is a control device. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent: Patent attorney Masuo Oiwa (and 2 others) Figure 2 Figure 3 Figure 4 Procedural amendment 0 own'' Showa year, month, day 1, case description Patent application No. 61-250151 No. 2
, Name of the invention Automatic sewing machine 3, Person making the amendment 5, Detailed description of the invention column and drawings of the subject specification of hO positive. 6. Contents of amendments and more Figure 4

Claims (1)

[Claims] (1) A needle that reciprocates, a needle bar drive unit that rotates the needle around its reciprocating axis, and a rotary hook that rotates fully;
A hook drive unit that rotates the hook around the reciprocating axis of the needle, an XY table that transfers the work cloth in the XY directions, and a synchronized movement of the needle bar drive unit and the hook drive unit by mechanical means. and an interlocking device for rotating the needle bar drive unit and hook drive unit in synchronization with the moving direction of the XY table so that the directions of the needle and hook are always in the same direction as the moving direction of the work cloth. What is claimed is: 1. An automatic sewing machine comprising: a drive system for controlling the sewing machine; and a control device for supplying signals to the drive system according to a predetermined sewing program.