KR101250287B1 - Embroidery machine having multi heads - Google Patents

Abstract

The present invention relates to a multi-head sewing machine, comprising: an upper shaft having a plurality of sewing heads arranged in a row; a drive shaft installed in parallel with the upper shaft and driven by a driving motor to transmit rotation driving force to the upper shaft; In a multi-head sewing machine including a lower shaft having a plurality of kilns corresponding to the head, the driving shaft is provided with at least two or more, and the driving motor is installed on each of the driving shafts to transmit rotational driving force, thereby reducing the capacity. The use of two drive motors reduces the load delivered by each axis and reduces the cost of installing and maintaining multiple head sewing machines.

Description

Multi-Duty Sewing Machine {EMBROIDERY MACHINE HAVING MULTI HEADS}

The present invention relates to a multi-head sewing machine, and more particularly, to a multi-head sewing machine that can reduce the load applied to the drive motor and minimize the torsion angle of the upper and lower shafts.

A sewing machine is a machine for forming various patterns on fabrics or sealing labels, sequins, etc. using threads. In order to increase the efficiency of embroidery work, conventional multi-head sewing machines are widely used.

Many-duty sewing machines are equipped with dozens of pairs of needle bars and kilns to carry out embroidery work. These needle bars and kilns must be maneuvered in an accurate positional relationship. This requires accurate power transfer from the drive motor.

Hereinafter, a configuration of a conventional multi-head sewing machine will be described with reference to FIGS. 1 and 2. 1 is a schematic perspective view of a frame of a multi-head sewing machine according to the prior art, and FIG. 2 is a configuration diagram of a multi-head sewing machine according to the prior art.

Normally the needle bar (not shown) is activated by the rotation of the upper shaft 100, the kiln (not shown) is activated by the rotation of the lower shaft (102). They are then linearly reciprocated by intermediary means such as cams or lever mechanisms.

The driving shaft 108 is installed in parallel with the upper shaft 100, and the driving shaft 108 is rotated by receiving power from the main driving motor 104, and rotates the driving force of the driving shaft 108 with respect to the upper shaft 100. It is configured to receive from a plurality of places.

The lower shaft 102 is rotated simultaneously with the upper shaft 100 by being connected to the upper shaft 100 by the pulley box 106. Transmission means such as timing belts are used between the drive shaft 108 and the upper shaft 100 to transmit accurate rotational force. The upper shaft 100 and the lower shaft 102 are installed along the elongated direction of the long beam 110 and the beam 110 is installed on the upper portion of the work table 112.

According to the related art, the driving shaft 108, the upper shaft 100, and the lower shaft 102 are driven by one driving motor 104. The rotational force of the drive motor 104 is applied to the main pulley 114 installed at the center position of the drive shaft 108 via the timing belt, which is also considered to reduce the torsion of the drive shaft 108 and the upper shaft 100. Do.

For more detailed information on this, refer to Patent Registration Nos. 10-0358929, 10-0419893, and the like, in which the applicant has filed a patent application with the Korean Patent Office.

Such multiple head sewing machine is provided that the length of the upper shaft 100 and the lower shaft 102 increases as the number of heads increases, thereby causing the following problems.

First, since the load of the drive motor 104 is greatly taken, it is necessary to use a large capacity motor. This adversely affects economics. To illustrate the problem of the prior art and the specification of the drive motor 104 that is conventionally used to numerically explain the effects of the present invention in the latter part of the present specification are as follows. The drive motor 104 has a capacity of 5KW, the rated output is 15.7Nm, the maximum output is 47.6Nm, and the rated rotational speed is 2600rpm.

Second, since the upper shaft 100 and the lower shaft 102 are connected to the pulley 106 installed at one end by a belt as shown in the drawing, the upper shaft 100 and the lower shaft 102 have a portion in which the twist angle increases along the longitudinal direction of each shaft. As a result, the needle bar and the kiln do not start with a precise positional relationship with each other, which causes a decrease in embroidery quality. For example, calculating the maximum torsion angle φ at each point M _A , M _B , M _C , M _D , M _E , M _F , M _G , in FIG. 2 results in the following results: . (In the equation below, M: moment, L: axis length, G: lateral elastic modulus of the shaft material, and I _z : cross-sectional secondary moment.

As in Equation 1 above, the twist angle is generated up to 1.53 ° at the M _E point.

Since the needle bar and the kiln move in proportion to the torsion angle, there may be an immediate problem related to the quality of the product.

In the case where the multi-head sewing machine is composed of 56 heads, the total load applied to the driving motor 104 can be calculated as follows. Figure 3 is a graph of the torque measured during one rotation (360 °) in one head when one drive motor rotates at a speed of 1300rpm. Referring to FIG. 3, the maximum torque applied to one head is measured as 0.806 Nm. If the total torque consists of 56 heads, the maximum torque of the driving motor 104 is

T = 0.806 (Nm) × 56 (EA) = 45.13 Nm

Will be calculated as

However, when using the power transmission device according to the prior art, the actual working torque is calculated as follows. 2, the total load (M _T ) actually applied to the drive motor,

M _T = M _U + M _L = 45.13 + 3.13 = 48.26 (Nm)

(Where M _U is the load acting on the upper axis, M _L is the load acting on the lower axis)

. 4 shows the rated torque and the maximum torque with respect to the rotational speed of the drive motor 104 used by the prior art in a solid line, and displays the actual maximum torque of the power transmission device according to the prior art in a dotted line to compare each other. will be. Referring to FIG. 4, the torque range of the conventionally used drive motor does not reach the maximum torque applied to the actual drive motor. Therefore, it can be seen that a larger capacity drive motor is required than was applied in reality.

The present invention has been made to solve the above problems, by reducing the load acting on the drive motor to reduce the installation and maintenance costs of the multi-head sewing machine, minimizing the torsion angle of the upper and lower shafts, the needle bar and the kiln as accurately as possible The objective is to provide a multi-head sewing machine that can improve the embroidery quality by maneuvering.

In order to achieve the object of the present invention as described above, the present invention is provided with a plurality of needle bar is provided with a plurality of needle heads arranged in a row at a predetermined interval on the front of the beam, and the needle bar while passing through the sewing head An upper shaft installed to be parallel to the upper shaft, connected to the driving motor using a power transmission means, and driven to rotate in synchronism with the driving motor, and at the same time to transmit a rotation driving force to the upper shaft, and the sewing machine. In a multi-head sewing machine including a lower shaft for driving a plurality of kilns corresponding to the head, the drive shaft is provided with at least two or more, the drive motor is installed on each of the drive shafts, characterized in that for transmitting a rotational driving force Two or more sewing machines are provided.

The upper and lower shafts may be divided into a plurality of, respectively.

In addition, any one of the upper and lower shafts may be divided into a plurality.

In the present invention, the upper shaft is divided into left and right by the first and second upper shafts, the lower shaft is divided into left and right by the first and second lower shafts, and the driving motor drives the first upper and first lower shafts located on one side. The first driving motor and the second driving motor which is synchronized with the first driving motor and drives the second upper shaft and the second lower shaft located on the other side.

In the present invention, the upper shaft is formed as one, the lower shaft is divided into left and right by the first and second lower shaft, the drive motor is a first drive motor for driving the first drive shaft located on one side, and the first drive motor And a second drive motor which is synchronized with and drives the second drive shaft located on the other side.

In addition, the upper shaft is divided into left and right by the first and second upper shaft, the lower shaft is formed as one, the drive motor is a first drive motor for driving the first drive shaft located on one side, and in synchronization with the first drive motor And it may be composed of a second drive motor for driving the second drive shaft located on the other side.

A timing belt may be used as a power transmission means for transmitting an accurate rotational force of the drive motor between the drive shaft and the upper shaft.

As described above, according to the configuration of the present invention, by using two drive motors of low capacity can reduce the load transmitted by each axis, it is possible to reduce the installation and maintenance costs of the multi-head sewing machine.

In addition, by minimizing the torsion angle of the upper and lower shafts to ensure that the needle bar and the kiln as accurately as possible, it is possible to improve the embroidery quality. Furthermore, by reducing the stress applied to each component of the embroidery machine to enable quiet operation and improve the durability of the device.

1 is a schematic perspective view of a frame of a multi-head sewing machine according to the prior art,
2 is a block diagram of a multi-head sewing machine according to the prior art,
3 to 4 is a graph showing the load to torque acting on the multi-head sewing machine according to the prior art,
5 is a schematic perspective view of a frame of a multi-head sewing machine according to an embodiment of the present invention;
6 is a block diagram of a multi-head sewing machine according to an embodiment of the present invention,
7 is a block diagram of a multi-head sewing machine according to another embodiment of the present invention,
8 to 9 is a graph showing the load to torque acting on the multi-head sewing machine according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, the configuration will be described with reference to FIGS. 5 to 6. 5 is a schematic perspective view of a frame of a multi-head sewing machine according to an embodiment of the present invention, FIG. 6 is a configuration diagram of a multi-head sewing machine according to an embodiment of the present invention, and FIG. 7 is a diagram of a multi-head sewing machine according to another embodiment of the present invention. It is a block diagram.

The multi-head sewing machine of the present invention includes a work table 1 and a beam 3 installed on the work table 1, and a plurality of needle bars (not shown) are provided on the upper shaft 5 on which the plurality of sewing heads are arranged. The lower shaft 7 is connected to a plurality of kilns (not shown) corresponding to the missing heads to be started.

In addition, the drive shaft 15 is installed in parallel with the upper shaft (5) and is driven by the drive motor 13 is provided, and the drive shaft 15 and the upper shaft (5) such as a timing belt to transmit an accurate rotational force Transmission means is provided.

The multi-head sewing machine of the present invention is provided with at least two drive shafts 15, and the drive motor 13 is connected to each of the drive shafts 15 and the power transmission means for transmitting rotational driving force. do.

According to the present invention, either the upper shaft 5 or the lower shaft 7 is divided into two parts.

First, as illustrated in FIG. 6, a structure in which the upper shaft 5 is formed as one axis and the lower shaft 7 is divided into first and second lower shafts 7a and 7b will be described. 5) is preferably composed of the first and second lower shafts 7a and 7b which are not divided into one axis and are arranged on the same line while the lower shaft 7 is also separated.

In this case, the lengths of the first and second lower shafts 7a and 7b are not necessarily the same, and it may be preferable to shorten the side where the load is high.

The first lower shaft 7a connected to one end of the upper shaft 5 is connected by the first pulley box 9 to be rotated together and the second lower shaft 7b connected to the other end of the second driving shaft 15b. ) Is connected by the second pulley box 11 and rotated together.

In one embodiment of the present invention the drive motor 13 is composed of the first and second drive motors (13a, 13b), to transfer the driving force of the first and second drive motors (13a, 13b) to the upper shaft (5) The driving shaft 15 is also divided into the first and second driving shafts 15a and 15b.

The first drive motor 13a and the first drive shaft 15a are driven by the first transmission means 19 , and the second drive motor 13b and the second drive shaft 15b are driven by the second transmission means 21 . Each is connected and powered.

At this time, the driving force of the first drive motor 13a transmitted to the first drive shaft 15a through the first transmission means 19 rotates the upper shaft 5, whereas the second transmission means 21 is driven. The driving force of the second drive motor 13b transmitted to the second drive shaft 15b through the upper shaft 5 is also transmitted to the second lower shaft 7b and the upper shaft 5 and the second lower shaft 7b. It is formed to drive the rotation at the same time.

On the other hand, the driving force of the first drive motor 13a transmitted to the upper shaft 5 is transmitted to the first lower shaft 7a through the first pulley box 9 connected to one end of the upper shaft 5 to the first lower shaft. 7a is driven to rotate, and the second lower shaft 7b is driven to rotate using the driving force transmitted through the second pulley box 11 connected to the other end of the second drive shaft 15b.

The drive shaft 15 and the upper shaft 5 are powered by the timing belt 17 at two or three locations. The number of timing belts 17 will be determined in proportion to the length of the upper axis. The drive shaft 15 offsets the problem of large loads by causing the upper shaft 5 to have a uniform torsional strength along the longitudinal direction.

Known transmission means can be used for the connection between the axes. For example, pulleys and belts may be used for the first and second transmission means 19 and 21 and the first and second pulley boxes 9 and 11. It is preferable to use a gear pulley as a pulley and a timing belt as a belt for accurate power transmission. However, the present invention is not limited thereto, and power transmission means such as gears, chains, and V-belts may be selected depending on circumstances.

In addition, in the embodiment of the present invention, the power transmission from the drive shaft 15 to the upper shaft 5 has also been described by using the timing belt 17, but is not necessarily limited thereto. A power transmission means such as a chain or a V-belt may be selected.

As described above, even if any one of the upper shaft 5 and the lower shaft 7 is divided into two or more and driven by a separate power source, some of the objects of the present invention can be achieved. However, it is further recommended that both the upper shaft 5 and the lower shaft 7 are divided into two, as shown in FIG. 7.

That is, the upper shaft 5 is composed of the first and second upper shafts 5a and 5b lying on the same line while being separated, and the first and second lower shafts 7a and 7b lying on the same line with the lower shaft 7 also separated. It is preferable that it consists of.

In this case, the lengths of the first and second upper axes 5a and 5b are not necessarily the same, and the same is true of the first and second lower axes 7a and 7b. It may also be desirable to shorten the more heavily loaded side.

In addition, it is preferable for synchronization that the needle bar and the kiln, which work in pairs, are driven by a single drive motor. Therefore, it is preferable that the first and second upper shafts 5a and 5b have the same length and the same number of needle bars are installed. The same applies to the first and second lower axes 7a and 7b.

The first upper shaft 5a and the first lower shaft 7a are connected and rotated together by the first pulley box 9 installed at one end, and the second upper shaft 5b and the second lower shaft 7b are provided at the other end. 2 are connected by the pulley box 11 and rotated together.

In one embodiment of the present invention, the drive motor 13 is also composed of first and second drive motors (13a, 13b).

The drive shaft 15 and the upper shaft 5 are powered by the timing belt 17 at two or three locations. The number of timing belts 17 will be determined in proportion to the length of the upper axis. The drive shaft 15 offsets the problem of large loads by causing the upper shaft 5 to have a uniform torsional strength along the longitudinal direction.

The first drive motor 13a and the first drive shaft 15a are respectively driven by the first transmission means 19, and the second drive motor 13b and the second drive shaft 15b are respectively driven by the second transmission means 21. Connected and powered.

Known transmission means can be used for the connection between the axes. For example, pulleys and belts may be used for the first and second transmission means 19 and 21 and the first and second pulley boxes 9 and 11. It is preferable to use a gear pulley as a pulley and a timing belt as a belt for accurate power transmission. However, the present invention is not limited thereto, and power transmission means such as gears, chains, and V-belts may be selected depending on circumstances.

According to the embodiment of the present invention, the power transmission device is provided symmetrically. However, it is not necessary to achieve symmetry exactly as shown. In addition, if the length of the beam 3 is longer, and the problems mentioned in the related art arise again, the upper shaft 5 and the lower shaft 7 may be divided into three or more, and the driving motor 13 may also be three or more. It may be provided.

According to the above configuration it can be obtained the following actions or effects. Hereinafter, the upper shaft 5 and the lower shaft 7 will be described with reference to FIGS. 7 to 9 by taking a state in which the upper and lower shafts 7 are divided left and right so as to have a similar length from side to side.

Calculating the maximum torsion angle φ at each point M _A , M _B , M _C , _Ml , M _J , M _K , in FIG. 7 results in the following results.

As shown in Equation 2 above, the maximum twist occurs at the M _K point and becomes 0.63 °. This result is a considerable reduction compared to the prior art results (1.53 ° at M _E ). This means that the position of the needle bar and the kiln can be maintained as accurately as possible compared to the prior art.

Since the first and second drive motors 13a and 13b share the load when the multi-head sewing machine is composed of 56 heads, 28 pieces (56 ÷ 2 = 28) are provided according to one drive motor 13. Will be loaded from the head of < RTI ID = 0.0 >, < / RTI > 8 is a graph of the torque measured during one rotation (360 °) in one head when one drive motor 13 rotates at a speed of 1300 rpm. Referring to FIG. 8, the maximum torque applied to one head is measured at 0.72 Nm (Note: it should be determined as an absolute value). If the total torque consists of 56 heads, the maximum torque applied to one driving motor 13 is

T = 0.72 (Nm) × 28 (EA) = 20.16 Nm

Will be calculated as

And the actual working torque is calculated as follows. Referring to Figure 6, the total load (M _T ) actually applied to one drive motor,

M _T = M _U + M _L = 20.16 + 1.56 = 21.72 (Nm)

(Where M _U is the load acting on the upper axis, M _L is the load acting on the lower axis)

. As a result, even if two drive motors are used, a total load of 43.44 Nm is applied, which is lower than the conventional state value (48.26 Nm).

9 shows the rated torque and the maximum torque in relation to the rotational speed of the drive motor 13 having a capacity of 2KW, and the actual maximum torque of the power transmission device according to the present invention is indicated by a dotted line and compared with each other. Referring to Figure 9 it can be seen that even if the capacity of the conventionally used drive motor is 2KW (rated torque 13.1 Nm, the maximum torque 3.5Nm) is not a problem at all, and rather has a 20% marginal power.

As described above, even when one motor of 5KW capacity is used, the output is insufficient, but sufficient torque can be exhibited by using two motors of 2KW capacity.

1: Worktable 3: Beam
5: upper axis 7: lower axis
9, 11: 1st, 2nd pulley box 13: Drive motor
15: drive shaft 17: timing belt
19, 21: 1st, 2nd transmission means

Claims (7)

A plurality of sewing heads provided with a plurality of needle bars and arranged in a line with a predetermined distance on the front of the beam;
An upper shaft driving the needle bar while passing through the sewing head;
A drive shaft installed in parallel with the upper shaft and connected to the driving shaft using a power transmission means, the driving shaft being synchronously rotated as the driving motor is driven, and simultaneously transmitting a rotation driving force to the upper shaft;
In a multi-head sewing machine comprising a lower shaft for driving a plurality of kilns corresponding to the sewing head,
At least two drive shafts are provided,
The drive motor is a multi-head sewing machine, characterized in that installed in each of the drive shaft to transmit a rotational driving force. The method of claim 1,
The upper and lower shafts are multi-threaded sewing machine, characterized in that each divided into a plurality. The method of claim 1,
Any one of the upper shaft and the lower shaft is divided into a plurality of sewing machine characterized in that the configuration. The method of claim 2,
The upper shaft is divided into left and right by the first and second upper shafts,
The lower axis is divided into left and right first and second lower axes,
The drive motor includes a first drive motor for driving the first upper shaft and the first lower shaft located on one side;
And a second driving motor synchronized with the first driving motor and configured to drive the second upper shaft and the second lower shaft on the other side. The method of claim 3,
The upper shaft is formed of one,
The lower axis is divided into left and right first and second lower axes,
The drive motor may include a first drive motor for driving the first drive shaft on one side of the drive shaft;
And a second driving motor configured to be synchronized with the first driving motor and to drive a second driving shaft on the other side of the driving shaft which is located on the other side. The method of claim 3,
The lower axis is formed as one,
The upper shaft is divided into left and right by the first and second upper shafts,
The drive motor may include a first drive motor for driving the first drive shaft on one side of the drive shaft;
And a second driving motor synchronous with the first driving motor and configured to drive a second driving shaft on the other side of the driving shaft which is located on the other side. 7. The method according to any one of claims 1 to 6,
And a timing belt is used as a power transmission means for transmitting an accurate rotational force of the drive motor between the drive shaft and the upper shaft.

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