JPH06126070A - Drive device of multi-head sewing machine - Google Patents

Abstract

PURPOSE:To simply perform an increase and decrease in the number of sewing arms in a multi-head sewing machine or the alteration of the multi-head sewing machine to a single head sewing machine while reducing the number of parts by making the shapes of the sewing arms common. CONSTITUTION:A plurality of sewing arms 1 respectively having upper shafts 6 built therein are arranged in parallel at an appropriate interval and hollow brackets 3 are mounted on the rear ends of the respective sewing arms 1 in a freely detachable manner and the common horizontal shaft 4 piercing all of the brackets 3 to be supported by the brackets 3 is rotationally driven by one drive motor 5. Power is transmitted to the upper shafts 6 in the sewing arms from the common horizontal shaft 4 through the drive gears 48 and follower gears 49 in the brackets 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a driving device for a so-called multi-head sewing machine, such as an embroidery sewing machine, in which a plurality of sewing machine arms are arranged in parallel on a bed.

[0002]

2. Description of the Related Art Conventionally, in this type of multi-head sewing machine,
For example, as described in JP-A-2-57289, a drive shaft such as an upper shaft built in each sewing machine arm is
It is configured to be rotationally driven by one drive motor via a common laterally long transmission shaft that penetrates all sewing machine arms.

In this case, as shown in the above-mentioned prior art, a laterally elongated cylindrical case for internally supporting a transmission shaft is integrally formed at the rear portion of the side surface of the sewing machine arm, and inside the rear portion of each sewing machine arm. In order to have a built-in transmission mechanism for the transmission shaft and the upper shaft, each sewing machine arm was designed to have a special shape.

[0004]

However, with the above construction, not only the sewing machine arm cannot be used as it is for a single-head type industrial embroidery multi-needle sewing machine, but also the number of sewing machine arms as a multi-head sewing machine is increased. There was a problem that it could not be easily increased or decreased. An object of the present invention is to solve this problem and to reduce the manufacturing cost by manufacturing a single-head sewing machine or by increasing / decreasing the number of sewing machine arms in a multi-head sewing machine by using one type of sewing machine arm in common. It is what

[0005]

In order to achieve the above object, a multi-head sewing machine driving apparatus of the present invention is a multi-head sewing machine in which a plurality of sewing machine arms each having an upper shaft therein are arranged in parallel at appropriate intervals. A hollow bracket is detachably attached to the rear end of each sewing machine arm so that the common horizontal shaft penetratingly supported by all the brackets can be rotationally driven by one drive source. While configuring
Power is transmitted from the common horizontal axis to the upper axis in each sewing machine arm through a transmission mechanism in each bracket.

[0006]

EXAMPLES Next, examples embodying the present invention will be described. FIG. 1 is a plan view of a multi-head, multi-needle sewing machine for embroidery in which a plurality of sewing machine arms 1 are arranged in parallel with a table 2. As will be described later in detail, a common horizontal shaft 4 penetrating laterally in a hollow cylindrical bracket 3 that is detachably provided at the rear end of each sewing machine arm 1 is rotationally driven by a single drive motor 5 to drive each bracket. Power is transmitted to the upper shaft 6 arranged in each sewing machine arm 1 via the transmission mechanism in 3.

In the base portion (rear portion) of each sewing machine arm 1, power is transmitted from the upper shaft 6 to the lower shaft (not shown) located below the bed (not shown) via the bevel gear pair 28 and the vertical axis 29. The electric power is transmitted to rotate a hook having a conventionally well-known structure (not shown). A slide case 7 having a rectangular frame shape in a front view is laterally movably supported on the front surface of a hollow and open front sewing machine head 1a which is a tip of each sewing machine arm 1, and a lower guide portion 7a of the slide case 7 is supported. And midway guide part 7b
Is a large number (12 in the embodiment) arranged in a horizontal row.
The lower part of the needle bar 9 and the middle part of the upper and lower parts are vertically slidably supported, and the needle 8 is attached to the lower end of each needle bar 9 (see FIGS. 3 and 5).

A cloth pressing frame (not shown) for holding a cloth to be sewn is arranged on the table 2.
The frame is intermittently moved in a predetermined XY direction via an X motor and an X direction moving mechanism and a Y motor and a Y direction moving mechanism, and is controlled by a control means (not shown) according to an embroidery pattern. It controls the intermittent operation of the forward and reverse rotations of the X motor and the Y motor.

Next, a drive mechanism for vertically driving one needle bar 9 and the balance 10 selected by the lateral movement of the slide case 7 will be described with reference to FIGS. 3 and 4. The needle bars 9 are provided on the upper side of the slide case 7.
The balances 10 arranged in a horizontal row corresponding to the above are supported by a horizontal shaft 11 so as to be vertically rotatable, and each balance 10 has a biasing spring 1
8 is set to the upward position. As shown in FIG. 4, the driven cam 13 is slidably fitted into the driven cam 13 of the balance driving cam 12 attached to the tip of the upper shaft 6 in the sewing machine head 1a. The swing arm 14 is attached to a rotary shaft 15 so as to rotate integrally. Then, by the rotation of the upper shaft 6, the rotating shaft 1
5 is reciprocally rotated by an appropriate angle. The fan-shaped drive gear 16 fixed to the rotary shaft 15 is selectively meshed with a fan-shaped driven gear 17 provided on the balance 10 that has come to the sewing position by the lateral movement of the slide case 6, and the balance 10 Swing only up and down.

A coil-shaped spring 20 is fitted between the needle holder 19 fixed to each needle bar 9 and the lower guide 7a of the slide case 7 to set each needle bar 9 to the raised position. Yes, by vertically moving the needle bar connector 23 mounted on the guide shaft 22 so as to be vertically movable via the connecting rod 21 eccentrically attached to the tip of the balance drive cam 12,
The engaging pin 25 of the needle holder 19 fixed to the needle bar 9 at the sewing position is selectively engaged with the engaging groove 24 of the needle bar connecting body 23 to sew only the needle bar 9 at that position. Drive up and down to the state.

On the front surface of the slide case 7,
As shown in FIG. 5, a cover plate 27 having a vertical hole 26 for vertically swinging each balance 10 is attached.
At the upper end of the slide case 7, as shown in FIG.
A thread tension stand 30 is fixed, and the upper end of the thread tension stand 30 is provided with a number of guide portions 31 (12 in the embodiment) corresponding to the number of the needle bars 9 in a horizontal row at regular intervals. On the other hand, on the front plate below it, there is a rotary member 3 for detecting thread breakage.
2 and the thread tension 33 which is clamped to apply tension to the needle thread are arranged in a zigzag shape in a front view.

Next, the mounting structure of the bracket 3 and the common horizontal shaft 4 to each sewing machine arm 1 will be described in detail with reference to FIGS. 6 and 7. As shown in FIG. 2, the rear end of the upper shaft 6 in each sewing machine arm 1 is rotatably supported via a bearing 40, and the rear end of the upper shaft 6 projects into the tubular bracket 3. There is. The base of the bracket 3 is detachably attached to the rear plate 1b of the sewing machine arm 1 with bolts 41. Thrust and radial bearings 42a and 42b and a radial bearing 43 for rotatably supporting the common horizontal shaft 4 are mounted on the side surfaces of the brackets 3, respectively. A restricting body 44 that blocks the lateral movement of the horizontal shaft 4 is fitted and fixed. A pulley 46 around which an endless belt 45 such as a V-belt for power transmission from the drive motor 5 is wound is attached to the outside of one side surface of the bracket 3 (see FIG. 7) closest to the position of the drive motor 5. And a safety cover 4 that stands on the bed
7, the pulley 46 and the endless belt 45 are covered.

Each of the brackets 3 has a drive gear 48 which is fitted and mounted on the common horizontal shaft 4 and a driven gear 49 which is fixed to the end of the upper shaft 6 and meshes with the drive gear 48. A mechanism is provided. The combination of the drive gear 48 and the driven gear 49 may be a screw gear pair, a bevel gear pair, a worm gear, or a face gear. A rotary encoder 50 is attached to the rear end of the upper shaft 6 so that the rotation speed of the upper shaft 6 can be measured. The rear end opening of each bracket 3 is covered by the cover body 5.
Covered by 1. The rotary encoder 50
May be mounted on the common horizontal axis 4.

With this configuration, when the drive motor 5 is started during sewing, the common horizontal shaft 4 is rotationally driven via the endless belt 45, and the drive gear 48 and the driven gear 49 in each bracket 3 are driven. The upper shafts 6 in all the sewing machine arms 1 can be simultaneously driven via the transmission mechanism of. According to the present invention, when the number of sewing machine arms 1 is increased or decreased, the bracket 3 is attached to the rear end of the sewing machine arm 1 to be added, and the common horizontal shaft 4 having a predetermined length is attached to all the brackets 3 ... Since the common horizontal shaft 4 and the upper shaft 6 in each bracket 3 may be provided with a transmission mechanism such as a gear in each bracket 3, the sewing machine arm 1 can have the same shape. At this time, the common horizontal shaft 4 is not a single thread, but the common horizontal shaft 4 having an appropriate length may be detachably connected by a joint (not shown).

When constructing a single-head sewing machine, the bracket 3 is removed from the rear end of the sewing machine arm 1,
A pulley (not shown) may be attached to the rear end of the upper shaft 6 protruding from the rear end of the sewing machine arm 1, and a belt from a drive motor may be wound around the pulley. Further, it goes without saying that the present invention can be applied not only to a multi-needle embroidery sewing machine, but also to a single-needle sewing machine.

[0016]

As described above, according to the present invention, the bracket is detachably attached to the rear end of the sewing machine arm, and the common horizontal shaft is supported through each bracket so that the bracket can be rotationally driven by one drive source. In addition, since a transmission mechanism from the common horizontal shaft to the upper shaft of each sewing machine arm is provided in each bracket, the bracket and the common horizontal shaft can be attached / detached and the transmission mechanism can be attached / detached. Thus, it is extremely easy to manufacture any type of sewing machine under the condition that the shape of the sewing machine arm is common to both the single-head sewing machine and the multi-head sewing machine. Further, the addition / removal work of the sewing machine arm in the multi-head sewing machine can be performed extremely easily because the addition / removal work of the sewing machine arm, bracket and transmission mechanism having the same shape may be performed. Further, since the sewing machine arm, the bracket and the transmission mechanism can be formed in the same shape, and the types of necessary parts can be greatly reduced, the manufacturing cost can be reduced and the parts management and the manufacturing process can be simplified. Play.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a multi-head multi-needle sewing machine.

FIG. 2 is a partially cutaway side view of a multi-needle sewing machine.

FIG. 3 is a side sectional view of a main part of a sewing machine head portion of a multi-needle sewing machine.

FIG. 4 is a perspective view of a drive mechanism for a needle bar and a balance.

FIG. 5 is a front view of a main portion of a multi-needle sewing machine head portion.

FIG. 6 is a view seen from the rear of the multi-head sewing machine.

FIG. 7 is a sectional view taken along the line VII-VII in FIG.

[Explanation of symbols]

 1 sewing machine arm 1a sewing machine head 2 table 3 bracket 4 common horizontal shaft 5 drive motor 6 upper shaft 7 slide case 40, 42a, 42b, 43 bearing 44 limiter 45 endless band 46 pulley 48 drive gear 49 driven gear

Claims (1)

[Claims] 1. In a multi-head sewing machine in which a plurality of sewing machine arms each having a built-in upper shaft are arranged in parallel at appropriate intervals, a hollow bracket is detachably attached to the rear end of each sewing machine arm. A common horizontal shaft penetratingly supported by all the brackets is configured to be rotationally driven by one drive source, while the common horizontal shaft is moved to the upper shaft in each sewing machine arm through a transmission mechanism in each bracket. A driving device for a multi-head sewing machine, which is configured to transmit power.