JP2001104671A - Multihead sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewing machine for simultaneously sewing a lot of thick cloths efficiently. SOLUTION: This multihead sewing machine is provided with a plurality of sewing machine units 11. In the sewing machine unit 11, lock-stitching is carried out by cooperation between a needle bar 5 supported in a sewing machine arm 3 arranged above sewing machine table 1 and an oscillation type loop catching apparatus 10 supported in a hook supporting body 7 arranged below the sewing machine table 1. The multihead sewing machine is also provided with a sewn cloth holding body 30 driven on the coordinate plane in both of the X and Y directions above the sewing machine table 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-head sewing machine comprising a plurality of sewing units provided with a half-turn shuttle as a swing type loop catcher.

[0002]

2. Description of the Related Art A multi-head sewing machine having a plurality of sewing machine units is generally of a lockstitch type employing a full rotary hook as a means for catching a lower thread. However, when sewing a thick workpiece such as an automobile seat cover, a sewing machine using a half-turn shuttle is often used as the lower thread catching means.

[0003]

However, existing sewing machines employing a half-turn shuttle as a swing type loop catcher include only a so-called single-head sewing machine having only one sewing machine unit. For this reason, the same sewing cannot be simultaneously performed on a plurality of objects to be sewn, and the sewing efficiency is low.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sewing machine which has been proposed in view of the above-mentioned disadvantages of the prior art, and which can efficiently sew a large number of thick workpieces simultaneously.

[0005]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and appropriately achieve the intended purpose, a multi-head sewing machine according to the present invention comprises a needle bar supported on a sewing machine arm provided above a sewing machine table; A plurality of sewing machine units for performing lockstitching in cooperation with an oscillating type loop catcher supported on a shuttle support provided below the sewing machine table are provided, and a coordinate plane is moved above the sewing machine table in both X and Y directions. And a sewn object holder that is driven by the sewing machine.

[0006]

The sewing object held in the sewing object holder corresponding to each sewing machine unit is simultaneously sewn by the corresponding sewing unit.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described below with reference to the accompanying drawings, taking an embodiment applied to a multi-head embroidery sewing machine. 1 to 3 show a first preferred embodiment of the present invention. FIG. 1 is an external perspective view of a multi-head embroidery sewing machine to which an embodiment is applied. An upper horizontal frame 2 is installed above a horizontal sewing table 1, and two sewing arms are provided on the front surface of the upper horizontal frame 2. Reference numerals 3, 3 are arranged at predetermined intervals in the horizontal direction. A needle bar 5 is supported on each of the sewing machine arms 3 so as to be movable up and down, and a balance 6 corresponding to the needle bar 5 is swingably supported. As shown in FIG. 2, each of the sewing machine arms 3 also supports a cloth holder 9.

As shown in FIG. 2, a lower frame 8 is provided below the sewing machine table 1, and respective shuttle supports 7 are provided on the lower frame 8 so as to be provided below the corresponding sewing machine arms 3. positioned. Each kettle support 7 has
As shown in FIG. 3, a half-turn shuttle 10 as a swing type loop catcher is supported. Each sewing machine arm 3 and the corresponding shuttle support 7 constitute one sewing machine unit 11.

As shown in FIG. 2, a sewing machine main shaft 12 extends through each of the sewing machine arms 3 so as to be rotatable, and the left end of the main shaft 12 is connected to the left side of the lower frame 8 standing upright. Is supported by a bearing 14 provided on the support 13 of the first embodiment. A needle bar driving mechanism and a balance driving mechanism (both not shown) built in each sewing machine arm 3 are connected to the sewing machine main shaft 12, and the needle bar driving mechanism and the balance are rotated by rotation of one of the main shafts 12. The driving mechanism is driven, whereby the needle bar 5 and the balance 6 are driven. A timing pulley 15 is fixed to a protruding portion of the sewing machine main shaft 12 from the bearing 14.
A timing belt 20 is stretched between the motor and a timing pulley 18 fixed to a motor shaft 17 of the drive motor 16. The drive motor 16 is fixed to the support 13 behind the upper frame 2 (see FIG. 1).
The power is transmitted via the timing belt 20 with the driving of the sewing machine, and the sewing machine main shaft 12 is driven to rotate in one direction.

Further, as shown in FIG. 3, each shuttle support 7
, A common drive shaft 21 is rotatably supported,
The left end of the drive shaft 21 is supported by a bearing 22 (see FIG. 2) provided on the left support 13. A drive bevel gear 23 is fixed to the drive shaft 21 inside each shuttle support 7, and each drive bevel gear 23 meshes with a driven bevel gear 25 fixed to the rear end of the shuttle shaft 24 supporting the half-turn shuttle 10. Have been.

As shown in FIG. 2, the drive shaft 21 is
A swing arm 26 is fixed to a portion protruding from the shaft 2, and a rotating arm 27 is fixed to the sewing machine main shaft 12 coaxially with the timing pulley 15. At the ends of the swing arm 26 and the rotating arm 27, connecting pins 29, 29 are projected in parallel with the rotation axis. Then, the ends of the swing arm 26 and the rotating arm 27 are connected to each other via the connecting pins 29, respectively.
Are connected by

The length of the swing arm 26 is the same as that of the rotary arm 2.
7 is set to be larger than the length of the swing arm 27. When the rotation arm 27 rotates with the rotation of the sewing machine main shaft 12, the swing arm 26 swings within a predetermined angle range via the connecting arm 28 (described later). ). Therefore, the drive shaft 21 reciprocates within a predetermined angle range with the rotation of the sewing machine main shaft 12. Therefore, the half-turn shuttle 10 shown in FIG. 3 includes a drive shaft 21 and a bevel gear 23,
It is reciprocated by the 25 linked drives. At this time, the predetermined angle range of the swing arm 26 is set such that the half-turn shuttle 10 reciprocates in an angle range of about 218 °.

As shown in FIG. 1, a workpiece holder 30 having a rectangular shape is placed on the upper surface of the sewing machine table 1. The workpiece holder 30 is connected to an X-direction drive mechanism 31 and a Y-direction drive mechanism 32 disposed below the sewing machine table 1, respectively. By driving the respective drive mechanisms, the holder 30 is moved to the sewing machine table 1. X above coordinate plane
It is designed to be moved in the -Y direction. In order to set the sewn objects on the sewn object holder 30, it is recommended that the sewn objects be set via frames (not shown) that individually support the respective sewn objects, but the present invention is not limited to this.

According to the configuration of the first embodiment, after setting the sewing object in the sewing object holder 30, the multi-head sewing machine is started in accordance with the sewing data input to the electric control unit (not shown). , The holding body 30 is attached to each sewing machine unit 11.
And the sewing is performed in accordance with the sewing data. In addition, since the half-turn kettle 10 is employed, even a thick sewing object and a thick thread to be used, it is possible to obtain a secure sewing with good sewing tightness.

FIGS. 4 and 5 show a second embodiment of the present invention. The same or equivalent members as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. . The difference between the second embodiment and the first embodiment is that the lower shaft 35 which rotates fully when the full rotary hook is driven is used to drive the drive shaft 37 via the power conversion mechanism 36. It is in. The power conversion mechanism 36 includes an eccentric ring 38 fixed to the lower shaft 35, an eccentric pin 41 eccentrically protruding from the shaft end of the drive shaft 37, and a ring portion 40 a at one end connected to the eccentric ring 38. And an arm 40 having a connecting hole at the other end fitted to the eccentric pin 41. When the lower shaft 35 is driven to rotate in one direction, the drive shaft 37 is reciprocated in a predetermined angle range by the power conversion mechanism 36, whereby each half rotary hook 10 is reciprocated in a predetermined angle range. It is supposed to.

<Other Embodiments> (1) In the illustrated embodiment, an example in which one needle bar is supported on the sewing machine arm has been described. However, a multi-needle type sewing machine that supports a plurality of needle bars may be used. (2) In the embodiment, a sewing machine provided with two sewing machine units is exemplified, but it is needless to say that the present invention can be applied to a sewing machine provided with three or more sewing machine units. (3) Multiple sewing machine units in Example 2 (for example, 10)
When the lower shaft is long, a plurality of (for example, five) power conversion mechanisms are provided, and a common drive shaft is arranged for each group consisting of a predetermined number (for example, two) of hook supports. And may be driven by respective power conversion mechanisms. (4) The drive shaft may be independently driven by a drive motor different from the drive arm side.

[0017]

As described above, according to the multi-head sewing machine according to the present invention, sewing is performed simultaneously on the workpieces corresponding to the respective sewing machine units, so that the sewing efficiency can be increased. In addition, since a half-rotary hook is used, sewing with good thread tightness can be efficiently performed on a thick workpiece.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a multi-head sewing machine according to a first embodiment of the present invention.

FIG. 2 is a left side view in which the multi-head sewing machine according to FIG. 1 is partially broken and enlarged.

FIG. 3 is a plan view schematically showing a connection state between each shuttle support and a drive shaft.

FIG. 4 is a plan view schematically showing a connection state between each shuttle support and a drive shaft in a second embodiment of the present invention.

FIG. 5 is a cross-sectional view taken along line AA of FIG. 4, showing a configuration in which a drive shaft is driven by a lower shaft via a power conversion mechanism.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sewing machine table 3 sewing machine arm 5 needle bar 7 shuttle support 10 half-turn shuttle 11 sewing machine unit 30 sewing object holder

Claims (2)

[Claims] A needle bar supported on a sewing machine arm provided above a sewing machine table and a swing type loop catcher supported on a shuttle support provided below the sewing machine table cooperate to perform lockstitch. And a coordinate plane above the sewing machine table.
A multi-head sewing machine comprising a workpiece holder to be driven in both directions. 2. The multi-head sewing machine according to claim 1, wherein a plurality of swing type loop catchers supported by the shuttle supports are driven by a common drive shaft.