JP2766052B2 - Multi-head, multi-needle sewing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multi-head, multi-needle sewing machine mainly used as an industrial embroidery sewing machine.

[Conventional technology]

FIG. 6 is an external perspective view of a conventional multi-head, multi-needle embroidery sewing machine. As is apparent from the drawing, a plurality (six) of sewing heads 210 are provided on the front surface of the sewing machine frame 2 arranged on the sewing machine table 4 along the left-right direction of the drawing.

FIG. 7 shows one sewing head 210 in a longitudinal sectional view. In FIG. 7, the sewing machine head 210 includes a sewing machine arm 212 fixed to the front surface of the sewing machine frame 2,
It comprises a slide case 250 mounted on the front surface so as to be slidable in the horizontal direction.

One base needle bar 40 is disposed on the back of the slide case 250 on the sewing machine arm 212, and a drive member 44 is mounted on the base needle bar 40 so as to be vertically movable.
The drive member 44 is driven up and down through the operation of the needle bar drive lever 20 by the rotation of the needle bar drive cam 16 on the main shaft 14 of the sewing machine. The sewing machine arm 212 also has
A balance drive lever 28 that rotates in conjunction with the rotation of the upper balance drive cam 26 is provided.

A plurality of needle bars 60 (only one needle bar is disclosed in FIG. 7) are mounted on the slide case 250 so as to be vertically movable. Further, the slide case 250 is provided with a balance shaft 292, and the needle bar 60 is mounted on the balance shaft 292.
Are supported in a rotatable manner.

When the slide case 250 is slid for color change as a part of the embroidery sewing control, a pin protruding from the needle bar holder 62 of one needle bar 60 is engaged with the drive member 44 accordingly. At the same time, the gear 294 of one balance 290 corresponding to the needle bar 60 is connected to the drive gear 32 of the balance drive lever 28.
Mesh with. Therefore, the selected one needle bar 60 is driven up and down by the drive member 44, and the corresponding balance 290 is moved in conjunction with the operation of the balance drive lever 28 to move the balance shaft 2
It rotates around the axis of 92.

[Problems to be solved by the invention]

In the multi-head, multi-needle sewing machine having the above configuration, for example,
An embroidery frame 200 that is XY-controlled on the table 4 shown in the figure is of a special type, that is, an embroidery type in which an embroidery cloth is pressed from above and held (fixed) on a base frame, and the pressing frame is automatically opened and closed. When a frame is used, some of the sewing heads 210 have needle bars 60 that interfere with the embroidery frame 200, and such a sewing head 210 cannot be used.

Therefore, the needle bar 60 of the sewing machine head 210 which cannot be used conventionally
Is removed from the slide case 250, or the slide case 250 is removed from the sewing machine arm 212. FIG. 8 is a sectional view showing the slide case 250 detached from the sewing machine arm 212.

Now, when removing the needle bar 60 from the slide case 250, the needle bar 66 equipped with the removal needle 68 and the needle bar holder 62 and the top dead center stopper 70 must be removed from the needle bar 60 as a matter of course. . In addition, slide the needle bar 60 back into the slide case 25
When assembled to zero, it is necessary to adjust the positions of the needle bar clamp 62 and the top dead center stopper 70.

On the other hand, as shown in FIG.
0 is removed, the balance 290 is
It comes off from the balance guide rail 298 fixed to the side. Therefore, when assembling the slide case 250,
Each balance 290 must be set back on the balance guide rail 298.

A technical problem of the present invention is to provide a multi-head, multi-needle sewing machine that can collectively remove needle bars of an unused sewing head while leaving a corresponding balance on the sewing machine arm side. .

[Means for solving the problem]

In order to solve the above problems, a multi-head, multi-needle sewing machine according to the present invention is configured as follows.

That is, a plurality of sewing heads are provided for the sewing machine frame, and each sewing head has a sewing machine arm fixed to the sewing machine frame, and a slide case slidably mounted on the arm. The case is provided with a plurality of needle bars and a number of balances corresponding to the number of the needle bars, and one needle bar selected by the slide control of the slide case is driven up and down to correspond to this. In a sewing machine of a type in which a balance is driven to rotate around a balance axis, the slide case includes a first case in which each of the balances is rotatably supported by a balance shaft, and a detachable case with respect to the first case. Assembled,
And it is divided into the second case provided with each of the above-mentioned needle bars.

(Operation)

According to the configuration, in the sewing machine head that cannot be used due to the use of the auxiliary equipment for sewing or the like, by removing the second case from the first case, each needle bar of the sewing machine head is collectively collected. Removed. This secures a space for installing or operating the incidental facilities.

When the needle bar is to be reassembled, it is only necessary to attach the second case to the first case, and the balances corresponding to these needle bars are left on the sewing machine arm while being supported by the first case. The troublesome work involved in attaching and detaching the pod is eliminated.

〔Example〕

Next, an embodiment of the present invention will be described with reference to FIGS. In the following embodiment, the present invention is applied to a multi-head, multi-needle industrial embroidery sewing machine.

First, one sewing head 10 is shown in a sectional view in FIG. 1, and a front view thereof is shown in FIG. In these drawings, the sewing machine head 10 has a sewing machine arm 12 and a slide case 50. The sewing machine arm 12 is fixed to the sewing machine frame 2, and the slide case 50 is
It is slidably attached to a front surface portion 12 (right side portion in FIG. 1) by a support structure described later.

The sewing machine arm 12 is provided with a single base needle bar 40 as shown in FIG. This basic needle bar 40
A jump base 42 and a driving member 44 are mounted on the shaft so as to move up and down while maintaining an integral relationship with each other. The driving member 44 is formed so that a pin 64 of a needle bar holder 62 of one needle bar selected by sliding the slide case 50 among the needle bars 60 described later is engaged.

A sewing machine main shaft 14 penetrates through the inside of the sewing machine arm 12, and a needle bar driving cam 16 and a balance driving cam 26 are fixed on the shaft. Therefore, the cams 16 and 26 rotate continuously in one direction together with the main shaft 14 of the sewing machine when the main shaft 14 of the sewing machine is rotated by a motor (not shown).

The rotation of the needle bar drive cam 16 causes the needle bar drive lever 20 to rotate about the axis of the support shaft 22 thereof through the reciprocating movement of the rod 18. The tip of the needle bar drive lever 20 is connected to the jump base 42 by a link 24. Therefore, when the needle bar drive lever 20 rotates, the jump base 42 and the drive member 44 are driven up and down along the base needle bar 40.

The rotation of the balance driving cam 26 causes the balance driving lever 28 to rotate around the axis of the support shaft 30. The rotation of the balance driving lever 28 is converted into a reciprocating rotation of a balance 90 described later.

The slide case 50 is divided into a first case 50A and a second case 50B. The first case 50A has a support bracket 55 having a dimension that is the full width of the slide case 50, and a pair of upper case rails 54 is fixed to the bracket 55. These upper case rails
Numerals 54 are slidably attached to rails 46 fixed to the upper front surface of the sewing machine arm 12 in the left-right direction of FIG. The first case 50A has a guide roller supported on the sewing machine arm 12 side as shown in FIG.
It is also guided in the sliding direction by 34.

Change brackets 57 are disposed on both left and right sides of the support bracket 55, respectively. A slide shaft 59 is inserted through these change brackets 57, and the bracket 57 and the slide shaft 59 are integrally connected. By reciprocating the slide shaft 59 along the axis thereof, the slide control of the slide case 50, which will be described later, is executed.

Both ends of the balance shaft 92 are supported by the first case 50A,
On the balance shaft 92, a plurality (same number as the needle bar 60 described later) of a plurality of balances 90 are rotatably supported. In each balance 90, a balance gear 94 is formed at an arc portion centered on the axis of each balance shaft 92. Further, the first case 50A has a number of lock levers 98 corresponding to the respective balances 90 rotatably supported by a single shaft 97, respectively. These lock levers 98 receive a spring force around the axis of the shaft 97. Due to this spring force, the tip of each lock lever 98
Each of the balances 90 is held in a state of being engaged with the corresponding lock groove. This keeps each balance 90 in the standby position shown in the drawing.

When one needle bar is selected by the slide of the slide case 50 as described later, the lock lever 98 is disengaged from the lock groove of the balance 90 corresponding thereto. That is, the lock lever 98 is rotated in the lock release direction against the spring force due to interference with the release roller 119 fixed to the support arm 118 on the sewing machine arm 12 side.

At the same time, the balance gear 94 of the balance 90 meshes with the drive gear 32 formed at the tip of the balance drive lever 28. Therefore, the balance 90 is reciprocally rotated in conjunction with the rotation of the balance drive lever 28.

The second case 50B includes a plurality of needle bars 60, and each needle bar 6
Numeral 0 is vertically movably supported by upper and lower horizontal frames 52 and 53 of the second case 50B. Needle bar holding for each needle bar 60
Each of the needle bar clamps 62 has a pin 64 engageable with the driving member 44. A sewing needle 68 is attached to the lower end of each needle bar 60 by a needle stopper 66. It is well known that a cloth presser 80 is attached to each of the needle bars 60, and these cloth pressers 80 are interlocked with the vertical movement of each needle bar 60 at a predetermined timing.

As is apparent from FIG. 2, the second case 50B is attached to the support bracket 55 of the first case 50A at two locations on the left and right with fixing screws 51. Also the second case 50
The lower horizontal frame 53 in B has a lower case rail 58
Is provided. The lower case rail 58 is slidably received on the rail 47 of the sewing machine arm 12, and the rear surface of the case rail 58 is received by a radial bearing 48 mounted on the axis of the base needle bar 40. Can be

The first case 50A includes a tone table 100, and the tone table 100 is provided with a plurality of tone plates 102. The mandrel 104 of each tone plate 102 can be pushed out through the operation of the link mechanism 109 by switching the solenoid 108 shown in FIG. By pushing the mandrel 104, a gap is formed between the tension plates 102, and the thread tension can be loosened when changing the color of the thread or cutting the thread.

FIG. 3 shows a part of FIG. 1 in an enlarged sectional view, and FIG. 4 shows a main member of FIG. 3 in a perspective view. As is apparent from these drawings, a thread take-up spring 112 is mounted on the back side of the warp thread plate 110 provided on the front surface of the first case 50A. This thread take-up spring 112 has a shaft 114
Is loosely wound around the outer periphery of the thread, and the thread is passed through a ring-shaped end 112a protruding toward the front side from the slit 111 of the warp thread plate 110. Therefore, the thread take-up spring 112 repeatedly rotates on the shaft 114 in accordance with the strength of the tension acting on the thread, and stops rotating when the thread breaks. Therefore, if the deflection of the other end 112b of the thread take-up spring 112 is detected by the magnetic sensor 116 shown in FIG. 1, the thread breakage can be detected. The magnetic sensor 116 extends from the support arm 118 of the release roller 119 and is attached thereto.

On the shaft 114, a torsion spring 115 for applying a torsional force to the thread take-up spring 112 is provided. This spring 1
15 is a spring force according to the amount of rotation of the shaft 114 about its axis,
That is, the force of the thread take-up spring 112 with respect to the thread tension is adjusted.

In the sewing machine having the above-described configuration, when the slide case 50 including the first case 50A and the second case 50B is slid with respect to the sewing machine arm 12 as described above, one needle bar 60 selected by the slide operation is performed. Needle bar hugging 62
The pin 64 is engaged with the driving member 44, and the needle bar 60 is driven up and down. At the same time, the lock of the balance 90 corresponding to the needle bar 60 is released, and the balance gear 94 meshes with the drive gear 32 of the balance drive lever 28. This makes the balance 90
Rotates around the axis of the balance shaft 92.

Now, for the sewing machine head 10 in which sewing cannot be performed when using an auxiliary facility for sewing, for example, a special embroidery frame with an actuator, the first case 50 is used.
Remove the second case 50B from A. First, both cases
The two fixing screws 51 fixing the 50A and 50B are loosened and removed, and the lower case rail 58 of the second case 50B is removed from the rail 47 below the sewing machine arm 12.

This results in the second case, as shown in FIG.
The needle bar 50B is removed from the sewing head 10, and the needle bars 60 and the presser foot 80 are collectively removed. On the other hand, the balances 90 in this state are left on the sewing machine arm 12 side while being attached to the second case 50B. For this reason, of the balances 90, the one at the standby position is held at that position, and the balance driving lever
Anything that can be linked to 28 is kept in that state.

Therefore, when assembling the second case 50B again, the lower case rail 58 is engaged with the rail 47 of the sewing machine arm 12, and the two fixing screws 51 are simply screwed into the support bracket 55 of the first case 50A. Is fine.

〔The invention's effect〕

As described above, according to the present invention, each needle bar of the sewing head which cannot be used due to the use of the auxiliary equipment can be collectively removed while each balance is left on the sewing machine arm. This eliminates the need for removing the needle bar holder and the like when extracting the needle, and the time involved in attaching and detaching the balance, making this kind of work extremely simple.

[Brief description of the drawings]

1 to 5 show an embodiment of the present invention, FIG. 1 is a sectional view of a sewing head, FIG. 2 is a front view of the sewing head,
3 is an enlarged cross-sectional view showing a part of FIG. 1, FIG. 4 is an external perspective view showing main members of FIG. 3, and FIG. 5 is a first view showing a state where a second case is removed. It is sectional drawing represented by correspondence with a figure. FIG. 6 is a perspective view showing a general multi-head, multi-needle sewing machine, and FIG.
FIG. 8 is a sectional view showing a conventional sewing head, and FIG. 8 is a sectional view showing a conventional slide case detached from the sewing head. 2 Sewing machine frame 10 Sewing head 12 Sewing arm 50 Slide case 50A First case 50B Second case 60 Needle bar 90 Balance 92 Shaft shaft

Claims (1)

(57) [Claims] A plurality of sewing heads are provided for a sewing machine frame. Each sewing machine head has a sewing machine arm fixed to the sewing machine frame, and a slide case slidably mounted on the arm. The slide case is provided with a plurality of needle bars and a number of balances corresponding to these needle bars, and one needle bar selected by slide control of the slide case is driven up and down, In a sewing machine of a type in which a corresponding balance is rotated around a balance axis, the slide case includes a first case in which each of the balances is rotatably supported by a balance axis, and a first case corresponding to the first case. A multi-head, multi-needle sewing machine, wherein the sewing machine is detachably assembled and divided into a second case having the needle bars.