JP2000140471A - Multi-needle type sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress vibration easily generated at the time of a high-speed operation with respect to a multi-needle type sewing machine. SOLUTION: A plate 47 is provided on the side of a box 6 for holding plural needle bars and needle thread take-ups, and a pin 51 is provided on the side of a machine body frame 39 so as to be projected and recessed. Holes 49 of the same number as the needle bars are formed on the plate 47, and by the entrance of the pin 51, the box 6 is positioned in a horizontal direction. By a multi-needle type embroidery sewing machine constituted in such a manner, the box 6 is mechanically positioned by simple constitution and the vibration generated in the box 6 is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-needle sewing machine having a plurality of needle bars and balances in one head, and capable of forming a sewing pattern of a plurality of colors by switching these needle bars and balances.

[0002]

2. Description of the Related Art Conventionally, there is a sewing machine which has a plurality of needle bars and a balance in one head, and continuously performs a sewing operation by switching these needle bars and balances. Sewing machines illustrated in JP-A-9-38367 and JP-A-9-75569 are examples.

When such a sewing machine is used, a sewing operation using a plurality of colors of thread can be continuously performed while the thread is automatically changed without the operator having to change the thread each time. The thread change is performed by moving the box holding the needle bar and the balance to the left and right with respect to the main body frame, and operating a specific balance and the needle bar corresponding to the balance in accordance with the moved position.

[0004] By the way, in order to meet the demand for higher efficiency of the sewing work, attempts have been made to speed up such sewing machines. For example, in the case of an embroidery sewing machine, there has been a demand for further increasing the speed, which has conventionally been limited to about 1000 to 1200 rpm as the rotation speed of the upper shaft.

[0005]

However, when the sewing machine is operated at high speed, the acceleration of the needle bar and the balance increases. Then, vibration is likely to occur in the box formed separately from the main body frame. This can adversely affect the quality of the sewn product.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a multi-needle sewing machine capable of preventing generation of vibration and maintaining the quality of sewing products even when a needle bar and a balance operate at high speed. And

[0007]

Means for Solving the Problems and Effects of the Invention A multi-needle sewing machine according to claim 1 of the present invention which has been made to achieve the above object has at least a plurality of needle bars arranged in the left-right direction. And a box for holding the same number of needle bars as the balances arranged in the left-right direction, and a box for supporting the box movably in the left-right direction, and at least a needle bar driving mechanism for driving the needle bar, and A main body frame on which a balance driving mechanism for driving the balance is mounted, a box driving unit for moving the box in the left-right direction with respect to the main body frame, and the needle bar corresponding to the balance and the needle bar, At a position where power is transmitted from a driving unit and the balance driving mechanism, a positioning mechanism that mechanically positions the box with respect to the main body frame,
It is characterized by having.

In this multi-needle sewing machine, the positioning mechanism
The box is positioned with respect to the main body frame at a position where the balance and the needle bar receive power transmission from the needle bar drive unit and the balance drive mechanism, respectively. Since the multi-needle sewing machine has a plurality of needle bars and balances, this positioning can be performed at least at the same number of positions as the number of needle bars. Since this positioning is performed mechanically, not by electromagnetic force, the positioning is performed with high accuracy and certainty.

Therefore, according to the multi-needle sewing machine of the first aspect, the vibration generated in the box can be suppressed,
Consequently, the speed of the multi-needle sewing machine can be increased. According to a second aspect of the present invention, in the multi-needle sewing machine according to the first aspect, the positioning mechanism is disposed on the box side, and a hole along the left-right direction has at least the number of the needle bars. An equal number of plates and a protruding / retractable member disposed on the main body frame side, wherein the balance and a needle bar corresponding to the balance transmit power from the needle bar driving unit and the balance driving mechanism, respectively. And a pin that is aligned with the hole formed in the plate when protruded at the receiving position.

That is, mechanical positioning is performed by projecting a pin provided on the body frame side and inserting it into a hole of a plate provided on the box side. In addition,
When switching between the needle bar and the balance, the pin is immersed so that the plate can freely move left and right with the box.

Therefore, according to the multi-needle sewing machine of the second aspect, the box can be mechanically positioned with the simple configuration as described above, and the vibration generated in the box can be suppressed. In addition, if the pin is configured not to sink when a power failure occurs after the positioning, the relative position between the box and the main body frame can be maintained during the power failure or after the power failure is restored. Although contrary to this description, a pin may be provided on the box side and a plate may be provided on the main body frame side. In this case, the pins are moved right and left by the box driving unit together with the box.

According to a third aspect of the present invention, in the multi-needle sewing machine according to the second aspect, at least one of the hole and the pin is formed in a tapered shape. In this way, the position of the plate (that is, the horizontal position of the box with respect to the body frame) is corrected as the pins protrude and enter the holes in the plate, even if the position of the plate is slightly shifted with respect to the pins. You. Also,
Thereby, the alignment between the pin and the hole is also ensured.

Therefore, according to the multi-needle sewing machine according to the third aspect, it is possible to perform mechanical positioning while correcting a displacement occurring before the pin is projected. The multi-needle sewing machine according to claim 4, wherein a box holding at least a plurality of needle bars arranged in the left-right direction and balances arranged in the left-right direction in the same number as the needle bars, and the box is supported. A multi-needle sewing machine provided with a main frame that extends from at least both sides in the left-right direction of the box and extends substantially rearward, and penetrates the main body frame in the left-right direction at the rear position. Thus, the main frame is movably supported in the left-right direction.

[0014] In this case, in addition to the position where the box is conventionally supported on the main body frame (usually on the front side and / or above the main body frame) (or both), the shaft is also used at a position away from the box rearward. Will be supported. Therefore, according to the multi-needle sewing machine of the fourth aspect, since the box is also supported at the rear part of the main body frame, the occurrence of vibration can be suppressed.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 is a front view of a multi-needle embroidery sewing machine 1 to which the present invention is applied. As shown in the figure, the multi-needle embroidery sewing machine 1 has five needle bars 3, and correspondingly, five balances 5 are arranged side by side on the front side. By moving the box 6 provided with the needle bar 3 and the balance 5 in the left-right direction of FIG.
Are switched, and an embroidery operation is performed using the upper thread passed through these. The holding members 37 projecting to the left and right sides at the lower portion of the box 6 are portions for supporting the box 6 at the lower portion thereof with respect to the main body frame 39.

FIG. 2 is a right side view of the multi-needle embroidery sewing machine 1. In this drawing, the rear part of the multi-needle embroidery sewing machine 1 is partially omitted. As shown in the figure, the holder 37 extends rearward (rightward in the figure) from the box 6 and is divided into holders 37a and 37b in the middle thereof. The rear holding member 37b grips the left and right shafts 41 that pass through the main body frame 39 in the left and right direction (in the drawing, the direction perpendicular to the drawing). Further, the front and rear shafts 43 are built in the holder 37.

The motor 45 is a power source for moving the box 6 right and left, and corresponds to a box driving section of the present invention. The plate 47 is for positioning the box 6 moved by the motor 45, and the pin 51 is inserted into a hole 49 formed in the plate 47, thereby positioning the box 6 in the left-right direction. That is, the pin 51 corresponds to the pin of the present invention. The pin 51 is tapered, and the hole 49 is also tapered to match. Therefore, the box 6 can be positioned even if the box 6 is slightly shifted left and right. Cylinder 53
Is for pushing the pin 51 in and out.

FIG. 3 is a plan view of the box 6. As shown in this figure, the plate 47 is divided into five (of which,
One of them is hidden by the cylinder 53 and not shown), and each is fixed to the base plate 57 with screws 55.
By loosening the screw 55, each of the five plates 47 can be moved right and left by about 0.2 mm. The screws 59 fix the front and rear shafts 43 and the holders 37a and 37b. By loosening the screws 59, the posture of the box 6 with respect to the left and right shafts 41 can be adjusted. The left and right shafts 41 correspond to the shaft of the present invention.

FIG. 4 shows the balance driving section. This figure is a view of the inside of the multi-needle embroidery sewing machine 1 as viewed from the right side in FIG. The balance 5 is rotatable around the point P,
The second point formed substantially symmetrically with respect to the tip 7 with respect to this point P
The first cylindrical portion 11 held between the forked portions 9 is swung by being vertically moved. Note that the first cylindrical portion 11 extends in the depth direction in the drawing, and the diameter of the first cylindrical portion 11 is the second forked portion 9.
The gap is slightly open. When the balance 5 is switched to another balance 5, the upper shaft 27 is stopped with the needle bar 3 in a posture corresponding to its top dead center, and the box 6 (left part of the figure) is perpendicular to the figure. Is moved to another balance 5
The second bifurcated portion 9 sandwiches the first cylindrical portion 11.

The first cylindrical portion 11 is fixed to the balance driving rod 13, and the second cylindrical portion 15 protrudes rearward (rightward in the drawing) from a position slightly lower than the center of the balance driving rod 13.
Is driven by moving up and down. 2nd cylindrical part 15
Is moved up and down by a swing shaft 17, and a first forked portion 19 formed at the front end (the left end in this figure) of the swing shaft 17 is
5 is pinched and the pivot shaft 17 is pivoted,
Cylindrical part 15, balance drive rod 13, and first cylindrical part 1
1 is moved up and down, and the balance 5 is swung.

A mechanism for swinging the swing shaft 17 is provided by the arm 21.
, The sliding body 23, the crank 25, and the upper shaft 27. Upper shaft 2
7 is rotated at a constant speed by a motor (not shown) and transmitted to the crank 25 via gears 29 and 31 thereof. A sliding body 23 is provided on the crank 25 so as to be rotatable around an axis parallel to the upper shaft 27.
Is pierced. The arm portion 21 is provided perpendicular to the swing shaft 17, and when the upper shaft 27 is rotated at a constant speed in this state, the swing shaft 17 swings.

An engaging portion 83 provided on a side surface of the needle bar driving rod 33 is fitted inside the engaged portion 81. When the upper shaft 27 is rotated, the needle bar driving rod 33 operates a crank mechanism (not shown). The needle bar 3 is driven by being vertically moved through the needle bar 3. When the needle bar 3 is switched to another needle bar 3, the upper shaft 27 is stopped at the top dead center of the needle bar 3, the box 6 is moved in a direction perpendicular to the figure, and another needle bar 3 is moved. The engaged portion 81 is fitted inside the engaging portion 83.

The multi-needle embroidery sewing machine 1 constructed as described above.
According to this, the box 6 can be mechanically positioned with a simple configuration, and the vibration generated in the box 6 can be suppressed. In addition, since the pins 51 and the holes 49 are tapered, mechanical positioning can be performed while correcting the displacement of the box 6 that occurs before the box is made to protrude.

The plate 47 corresponds to the needle bar 3 and is
Since it is divided, it can be adjusted for each position to be positioned. In addition, the box 6 is
Since the rear portion is supported by the left and right shafts 41, the stability of the box 6 is increased, and the occurrence of vibration can be suppressed.

As described above, the multi-needle embroidery sewing machine 1 has been described as an embodiment of the present invention, but the present invention is not limited to such an embodiment and can be implemented in various modes. For example, the present invention may be applied to a multi-needle sewing machine other than an embroidery sewing machine. Further, the present invention may be applied to a multi-needle sewing machine having six or more needle bars 3 or a multi-needle sewing machine having two to four needle bars 3. Further, as in a sewing machine described in JP-A-61-37194, the box may be moved right and left by rotating the box with respect to the main body frame.

In the multi-needle embroidery sewing machine 1, the pins 51, the holes 4
9 are both tapered, but may be in a different form. For example, the hole 49 may have the same diameter, and the pin 51 may have a chamfered periphery. Further, the tip of the pin 51 may have a spherical shape. Even in this case, an effect similar to an embodiment in which both the pin 51 and the hole 49 are tapered is achieved.

[Brief description of the drawings]

FIG. 1 is a front view of a multi-needle embroidery sewing machine 1 according to an embodiment of the present invention.

FIG. 2 is a side view of the multi-needle embroidery sewing machine 1;

FIG. 3 is a plan view of the vicinity of a box 6 of the multi-needle embroidery sewing machine 1;

FIG. 4 is a side view showing a balance mechanism of the multi-needle embroidery sewing machine 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Multi-needle embroidery sewing machine 3 ... Needle bar 5 ... Balance 6 ... Box 11 ... 1st cylindrical part 13 ... Balance driving rod 15 ... 2nd cylindrical part 17 ... Oscillating shaft 19 ... 1st forked part 21 ... Arm part 23 ... Sliding body 25 ... Crank 27 ... Upper shaft 33 ... Needle drive rod 37,37a, 37b ... Holding body 39 ... Main body frame 41 ... Left and right shaft 45 ... Motor 47 ... Plate 49 ... Hole 51 ... Pin 81 ... Engaged part 83 ... engaging part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazushi Inoue 15-1 Naeshiro-cho, Mizuho-ku, Nagoya, Aichi Prefecture Inside Brother Industries, Ltd. No. 1 F-term in Brother Industries, Ltd. (reference) 3B150 AA20 CB04 CE24 CE28

Claims (4)

[Claims] 1. A box for holding at least a plurality of needle bars arranged in the left-right direction and the same number of balances as the needle bars, and a balance arranged in the left-right direction, and the box is movable in the left-right direction. A body frame on which a needle bar drive mechanism for driving the needle bar and a balance drive mechanism for driving the balance are mounted, and a box drive for moving the box relative to the body frame in the left-right direction. And a position for mechanically positioning the box with respect to the main body frame at a position where the balance and the needle bar corresponding to the balance receive power transmission from the needle bar driving unit and the balance driving mechanism, respectively. A multi-needle sewing machine comprising: a mechanism; 2. The positioning mechanism is disposed on the box side, and a plate having holes formed in the left-right direction at least as many as the number of the needle bars; A possible member, formed on the plate when the balance and the needle bar corresponding to the balance are projected at positions where power is transmitted from the needle bar drive unit and the balance drive mechanism, respectively. The multi-needle sewing machine according to claim 1, further comprising: a pin matching the hole. 3. The device according to claim 2, wherein at least one of the hole and the pin is formed in a tapered shape.
The multi-needle sewing machine according to 1. 4. A box for holding at least a plurality of needle bars arranged in the left-right direction, balances in the same number as the needle bars, and balances arranged in the left-right direction, and a main body frame for supporting the box. In the multi-needle sewing machine, the box extends at least from both sides in the left-right direction of the box and extends substantially rearward, and a shaft penetrating the main body frame in the left-right direction at the rear position. A multi-needle sewing machine movably supported by the main body frame.