JPH0847589A - Sewing machine - Google Patents

Abstract

PURPOSE:To improve the efficiency of sewing by facilitating work for setting a thick object to be sewn such as bedding to a holding frame on a sewing machine table or for detaching it even in the case of such an object to be sewn by extending a space between a sewing machine head and the sewing machine table. CONSTITUTION:Concerning the sewing machine in a form of movably mounting a holding frame 18 for the object to be sewn in both directions X and Y on a sewing machine table 16 positioned under a sewing machine head 30, the sewing machine head 30 is supported on the side of the sewing machine table 16 so as to be moved from a sewing position, where the sewing of the object to be sewn set to the holding frame 18 is enabled, to an upper saving position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine having a sewing machine head provided with a needle bar and a balance, and a holding frame which is driven in both X and Y directions on a sewing machine table located below the sewing machine head.

[0002]

2. Description of the Related Art This type of sewing machine is set on a holding frame by driving a needle bar of the sewing machine head and a balance and moving the holding frame on the sewing machine table in both X and Y directions. Sewing such as embroidery is performed on the sewn product. The positional relationship between the sewing machine head and the sewing machine table in the vertical direction is set to an interval suitable for sewing the material to be sewn.

[0003]

However, the vertical distance between the sewing machine head and the sewing machine table, that is, the space under the sewing needle connected to the lower end of the needle bar is narrow, and the sewing frame is sewn on the sewing frame. It is difficult to set or remove. Particularly when a thick sewn object such as a futon is set on the holding frame, the work is time-consuming and the efficiency of the sewing work is deteriorated. The problem to be solved by the present invention is to widen the space between the sewing machine head and the sewing machine table by moving the sewing machine head to the retracted position, and even if it is a thick sewn object such as a futon, The purpose of this is to facilitate the work of setting and removing the sewing machine on the holding frame on the sewing machine table and improving the efficiency of the sewing work.

[0004]

In order to solve the above-mentioned problems, the sewing machine according to the present invention is constructed as follows. According to the technique of claim 1, the holding frame for the sewing object is X, on the sewing machine table located below the sewing machine head.
A sewing machine of a type mounted so as to be movable in both Y directions, wherein the sewing machine head is provided on the sewing machine table side,
The sewing machine is movably supported from a sewing position where the material to be sewn set in the holding frame can be sewn to an upper retracted position.
The technique according to claim 2 is provided with a plurality of sewing heads, and a holding frame for a sewing object is movably mounted in both X and Y directions on a sewing machine table located below these sewing heads. The sewing machine head is attached to a supporting frame that can be moved up and down with respect to the sewing machine table side, and the sewing machine heads are moved by the lifting operation of the supporting frame.
The sewing machine is configured to move from the sewing position where the material to be sewn set in the holding frame can be sewn to the upper retracted position.

[0005]

According to the technique of claim 1, when the sewing machine head is in the sewing position, a predetermined sewing can be performed on the object to be sewn set in the holding frame,
When the sewing machine head is moved to the retracted position, the space between the sewing machine head and the sewing machine table is greatly expanded. Therefore, it becomes easy to replace the sewn item with respect to the holding frame. According to the technique of claim 2, in the case of expanding the space between each sewing machine head and the sewing machine table in a sewing machine having a plurality of sewing machine heads, these sewing machine heads are simultaneously moved to their respective retracted positions. It can be moved.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. The following embodiments apply the present invention to a sewing machine of a type having a plurality of multi-needle heads capable of color-changing embroidery. FIG. 1 is a front view of the embroidery sewing machine, and FIG. 2 is a plan view thereof. As shown in these drawings, the support parts 12,
13 are fixed respectively. These support parts 12,
Both ends of the support frame 20 are supported on the upper surface of 13 so that they can be moved up and down, respectively, as will be described later. On the front surface of the support frame 20, a plurality (seven) of sewing machine heads 3 having a plurality of (six) needle bars 30c and a balance (not shown) of the same number as the needle bars 30c are provided.
Zeros are arranged at equal intervals.

FIG. 3 is a sectional view taken along the line AA of FIG. As is apparent from this drawing, in each sewing machine head 30, a needle bar case 30b having six needle bars 30c is slidable in the width direction with respect to a sewing machine arm 30a fixed to the support frame 20. It has been assembled. Needle bar case 3 for each sewing machine head 30
0b is connected by a rod (not shown). By pushing and pulling this rod along its axis, each needle bar case 30b is slid with respect to each sewing machine arm 30a and used in each sewing machine head 30. Needle bar 30
You can select c.

As shown in FIGS. 1 to 3, a sewing machine table 16 is arranged on the upper surface of the frame body 10, and a predetermined sewing cloth (not shown) is provided on the upper surface of the sewing machine table 16.
A holding frame (embroidery frame) 18 on which can be set is placed. The holding frame 18 is adapted to move in both X and Y directions in conjunction with a frame driving mechanism (not shown) controlled based on, for example, embroidery data. Also, the sewing machine table 1
In the frame main body 10 located on the lower surface of the sewing machine 6, a hook base 40 having a hook 42 therein is provided.
Are respectively provided at positions corresponding to. A thread stand 60 is fixed to the upper surface of the support frame 20, and a sewing needle (not shown) connected to the lower end of the needle bar 30c of each sewing head 30 is attached to the upper surface of the thread stand 60. A winding yarn is set up to supply the yarn individually.

The mechanism for moving the support frame 20 up and down with respect to the support parts 12 and 13 is the same in both support parts 12 and 13. Therefore, the configuration on the side of the one support portion 12 arbitrarily selected will be described, and the description on the side of the other support portion 13 will be omitted. In FIG.
5 is a sectional view taken along line B-B of FIG. 5, and FIG. 5 shows a partially enlarged sectional view of FIG. Further, FIG. 6 shows a sectional view taken along the line DD of FIG. As is clear from these drawings, two guide pipes 1 are provided on the inner bottom portion of the support portion 12.
4 are fixed vertically. Two guide rods 22 fixed vertically to the lower surface of the support frame 20 are slidably inserted into these guide pipes 14, respectively.

On the other hand, a screw shaft 26 provided through the upper plate of the support portion 12 and the lower plate of the support frame 20.
Are rotatably supported by the upper plate of the support 12 and a bearing 28 fixed to the inner bottom thereof. A screw portion 26 a formed on the outer periphery of the screw shaft 26 near the upper end is screwed into a screw nut 23 fixed to the lower plate of the support frame 20. Further, as shown in FIG. 6, a control motor (pulse motor or the like) 24 is provided on the inner bottom portion of the support portion 12. The drive pulley 25 fixed to the output shaft of the control motor 24 and the driven pulley 27 fixed to the lower end of the screw shaft 26 can transmit rotation through a timing belt 29 hung between them. .

The individual control motors 24 on both the support portions 12 and 13 are synchronously driven in the same direction. Therefore, by rotating the screw shaft 26 by driving these control motors 24, the support frame 20 is moved up and down while being guided by the guide pipe 14 and the guide rod 22. That is, by raising the support frame 20 from the position shown in FIGS. 1 to 6 to the position shown in FIGS.
The sewn object set at is moved from the sewing position where it can be sewn to the retracted position.

As is apparent from FIGS. 1 to 3, each sewing machine arm 30a in each sewing machine head 30 described above.
A sewing machine main shaft 32 penetrates through. This sewing machine spindle 3
The needle bar 30c of each sewing machine head 30 is rotated by two rotations.
And a balance (not shown) are individually driven. Further, a hook drive shaft 44 penetrates through each of the above-mentioned hook bases 40, and rotation of this hook drive shaft 44 causes each hook base 40 to rotate.
The rotary hook 42 is driven to rotate. As shown in FIGS. 1, 3 and 4, the motor 50, which is a drive source of the sewing machine main shaft 32 and the shuttle drive shaft 44, has the support 12
Is provided on the frame body 10 below. The drive pulley 51 fixed to the output shaft of the motor 50 has a structure as shown in FIGS.
The rotation can be transmitted to the large-diameter pulley 46 fixed on the shaft of No. 4 through the first timing belt 52 hung between them. Further, the small-diameter pulley 47 fixed on the shaft of the shuttle drive shaft 44 and the main shaft pulley 38 fixed on the shaft of the sewing machine main shaft 32 can transmit rotation through a second timing belt 53 hung between them. Has become. As a result, the rotation of the motor 50 is transmitted to both the sewing machine main shaft 32 and the shuttle drive shaft 44.

FIG. 7 is an enlarged sectional view taken along the line CC of FIG. As is clear from this drawing, a portion of the sewing machine main shaft 32 to which the main shaft pulley 38 is fixed is a bearing 34 fixed to the front surface of the support frame 20.
It is rotatably supported by. Then, this portion is covered with a cover 36 fixed to the support frame 20. On the other hand, the shuttle drive shaft 44 is rotatably supported by a pair of bearings 45 fixed to the inner bottom of the support portion 12, and the large-diameter pulley 46 is interposed between the bearings 45.
A small-diameter pulley 47 is fixed to the shuttle drive shaft 44.

As is apparent from FIGS. 5 and 7, the intermediate portion of the second timing belt 53, which is hung between the main shaft pulley 38 of the sewing machine main shaft 32 and the small diameter pulley 47 of the shuttle drive shaft 44, is provided at a substantially intermediate portion. Is provided with a tension pulley 56. The tension pulley 56 is supported by an arm 55 with respect to an output shaft of a control motor (geared motor or the like) 54 fixed inside the support portion 12. By driving the control motor 54 and displacing the tension pulley 56, a change in the axial distance between the sewing machine main shaft 32 and the shuttle drive shaft 44 due to the lifting operation of the support frame 20 is allowed, as will be described below. And functions to keep the tension of the second timing belt 53 constant.

Next, the operation of the sewing machine configured as described above will be described. It is now assumed that the support frame 20 is in a lowered state as shown in FIGS. 1 to 7, and each sewing machine head 30 is in the sewing position as described above. Here, when the sewing machine is started, the sewing machine main shaft 32 and the shuttle drive shaft 44 are both rotated by the drive of the motor 50. As a result, the needle bar 30c and the balance selected as described above in each sewing machine head 30 are driven, and the shuttle 42 of each shuttle base 40 is rotationally driven. on the other hand,
The holding frame 18 is driven and controlled in the X and Y directions on the upper surface of the sewing table 16 in synchronization with these driving operations, whereby sewing such as embroidery is performed on the workpiece set in the holding frame 18.

When a large space is required between the needle bar 30c of the sewing machine head 30 and the sewing machine table 16 such as when setting a thick material to be sewn on the holding frame 18, The support frame 20 may be raised to move each sewing machine head 30 from the sewing position to the retracted position. Therefore, in order to move the sewing machine head 30 to the retracted position, the respective control motors 24 of the both support portions 12 and 13 are driven to rotate the screw shaft 26 in the direction in which the support frame 20 is raised. As a result, the support frame 20 is raised to the state shown in FIGS. 8 and 9, and the space between the needle bar 30c of each sewing machine head 30 and the sewing machine table 16 is expanded. 8 is a front view showing the sewing machine when the sewing machine head 30 is in the retracted position in correspondence with FIG. 1, and FIG. 9 is a sectional view showing the sewing machine in the same state in correspondence with FIG.

When the support frame 20 is raised as described above, the tension pulley 56, which applies tension to the second timing belt 53, is driven by the control motor 54 to move from the position shown in FIG. 5 to the position shown in FIG. 9, for example. Displace. Accordingly, it is possible to allow the axial distance between the sewing machine main shaft 32 and the shuttle drive shaft 44 to increase as the support frame 20 moves up. When the setting of the sewn product on the holding frame 18 is completed, the control motor 24
Are driven to rotate in the opposite direction to lower the support frame 20 to the original position, and each sewing machine head 30 is returned from the retracted position to the sewing position. At this time, the tension pulley 56 is also displaced to the original position again by the drive of the control motor 54, and the tension at the time of sewing the second timing belt 53 is maintained.

The raising and lowering of the support frame 20 is controlled based on an ascending command or a descending command by a switch operation (not shown). Once these ascending or descending commands are issued, the control motor 24 is stopped by an electric signal from a sensor (not shown) that detects the ascending or descending position of the support frame 20. Further, with respect to the raising command, the support frame 20 may be stopped at an arbitrary raising position.

In the above embodiments, the support frame 20 is provided with a plurality of sewing machine heads 30 (multihead type). However, the support frame 20 may be provided with one sewing machine head 30. Further, the sewing machine may have a form in which the sewing machine arm of one sewing machine head is fixed to the frame body 10 of the sewing machine. In the case of the structure in which the sewing machine arm is fixed to the frame body 10 as described above, the portion of the sewing machine head including the needle bar, the balance, and the sewing machine main shaft may be moved up and down with respect to the sewing machine arm.

On the other hand, the control motor 24, the screw shaft 26, and their interlocking members, which constitute the mechanism for moving the support frame 20 up and down, may be replaced by an actuator such as a hydraulic cylinder. Further, a control motor 54 for displacing the tension pulley 56
Instead of this, a biasing force in the direction of applying tension to the second timing belt 53 is always applied to the tension pulley 56, and a member corresponding to, for example, the arm 55 is moved along with the rise of the support frame 20. Alternatively, the tension pulley 56 may be rotated to displace it against the biasing force.

[0021]

According to the present invention, by moving a single or a plurality of sewing heads to a retracted position as required, a sewing needle connected to the lower end of the needle bar of the sewing head and a sewing table are sewn. The space can be greatly expanded, and even in the case of a thick material to be sewn, such as a futon, it is easy to set or remove it on the holding frame on the sewing machine table, and the efficiency of the sewing operation is improved.

[Brief description of drawings]

FIG. 1 is a front view of an embroidery sewing machine.

FIG. 2 is a plan view of an embroidery sewing machine.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

5 is a cross-sectional view showing an enlarged part of FIG.

6 is a cross-sectional view taken along the line DD of FIG.

7 is an enlarged cross-sectional view taken along the line CC of FIG.

FIG. 8 is a front view showing the sewing machine when the sewing machine head is in the retracted position in association with FIG. 1.

FIG. 9 is a cross-sectional view showing the sewing machine when the sewing machine head is in the retracted position, corresponding to FIG. 5;

[Explanation of symbols]

 16 Sewing machine table 18 Holding frame 20 Support frame 30 Sewing machine head

Claims (2)

[Claims] 1. A sewing machine in which a holding frame for an article to be sewn is placed on a sewing machine table located below the sewing machine head so as to be movable in both X and Y directions, and the sewing machine head is provided on the sewing machine table side. On the other hand, a sewing machine which is movably supported from a sewing position where the material to be sewn set in the holding frame can be sewn to an upper retracted position. 2. A sewing machine having a plurality of sewing heads, and a holding frame for a sewing object placed on a sewing table located below these sewing heads so as to be movable in both X and Y directions. The respective sewing machine heads are attached to a support frame that can be moved up and down with respect to the sewing machine table side, and the sewing machine heads are set to the holding frame by the raising operation of the support frame. A sewing machine configured to move from a sewing position at which a sewn product can be sewn to an upper retracted position.