JPH07303774A - Holding frame driving device for sewing machine - Google Patents

Abstract

PURPOSE:To improve quality by keeping a sewing state for embroidery on curved cloth to be sewn, etc., satisfactorily and to set the cloth to be sewn on a holding frame even when a raw material is the one of high rigidity. CONSTITUTION:This device is a holding frame driving device for a sewing machine, and it is equipped with a holder 30 provided so as to be moved in directions of X and Y based on frame driving data for sewing, and the holding frame 40 formed in curved shape so as to set the curved cloth to be sewn almost as it is and supported so as to roll the outer peripheral part for the holder 30 and to be moved in both directions of X and Y. Moreover, it is equipped with a mechanism consisting of a presser roller 60 to roll the holding frame 40 so as to always bring the outer peripheral part of a part in accordance with the needle dropping point of the sewing machine into contact with the side of the holder 30, etc., for example, by the movement to X direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding frame driving device for a sewing machine which, when sewing a curved cloth to be sewn such as embroidery, drives the cloth to be sewn based on frame driving data.

[0002]

2. Description of the Related Art For example, when embroidering at a predetermined position on the side circumference of a hat, one of the means is to set the hat in a semi-finished state on an embroidery sewing machine and sew it. That is, of the plurality of pieces forming the hat, a piece to be sewn is one in which only a predetermined number of pieces forming the portion where the embroidery is scheduled are sewn together. Since this cloth to be sewn is curved, it is conventionally spread as flat as possible and set on a flat holding frame, and this holding frame is moved on the plane X, X based on the frame drive data for sewing (embroidery). Embroidery is performed by driving in the Y direction.

[0003]

However, it is not possible to flatten the originally curved cloth to be sewn, and the material of the cloth to be sewn receives a partially biased pulling force, so that the cloth to be sewn as a whole is sewn. Is set in the holding frame in a distorted state. As a result, the sewing condition such as embroidery on the cloth to be sewn is poor and the quality is deteriorated. In addition, when the cloth to be sewn is a highly rigid material, it may not be possible to set it on the holding frame. The problem to be solved by the present invention is to set a curved cloth to be sewn in its holding frame in almost its shape to enable proper sewing, thereby maintaining a good sewing state such as embroidery and improving quality. In addition, it is possible to set on the holding frame even if the cloth to be sewn is a material having high rigidity.

[0004]

In order to solve the above-mentioned problems, a holding frame driving device for a sewing machine according to the present invention is constructed as follows. That is, the support provided so as to move in both the X and Y directions based on the frame driving data for sewing, and the curved cloth to be sewn are formed in a curved shape that can be set in substantially the same shape, and the outer circumference thereof is set. A holding frame whose part is rotatably supported with respect to the support and movable together with the support in both X and Y directions; and X and Y of the support.
It is provided with a mechanism for rolling the holding frame such that the outer peripheral portion of the portion corresponding to the needle drop point of the sewing machine always contacts the side of the support body by movement in any direction.

[0005]

According to the above construction, the curved cloth to be sewn is reasonably set in the holding frame without any difficulty, and the holding frame is moved together with the support body which moves in accordance with the frame drive data. , Y Move in both directions. By the movement in either direction at this time, the holding frame rolls so that the outer peripheral portion of the portion corresponding to the needle drop point of the sewing machine comes into contact with the support body side. As a result, even if the cloth to be sewn is still curved, at the needle drop point, the sewing needle of the sewing machine is inserted substantially at right angles to the material surface. Therefore, the sewing condition such as embroidery is improved, and the quality of the finished product is improved.

[0006]

Embodiments of the present invention will now be described with reference to the drawings. Example 1 FIG. 1 is a plan view showing a multi-head sewing machine. As shown in this drawing, an X-axis drive unit 12 and a Y-axis drive unit 14 are arranged on the lower surface of the sewing machine table 10. X
The axis drive unit 12 reciprocally drives the belt in the X direction by driving a pulse motor (not shown) based on frame drive data for embroidery, which is a type of sewing, and the Y-axis drive unit 14 also outputs a pulse based on the frame drive data. The belt is reciprocally driven in the Y direction by driving the motor.

On the other hand, on the upper surface of the sewing machine table 10, an X-axis moving body 13 which reciprocates only in the X direction by driving the X-axis driving unit 12, and a reciprocating movement in the Y direction only by driving the Y-axis driving unit 14. A moving Y-axis moving body 15 is arranged respectively. The X-axis moving body 13 is provided with a driver element 16 connected to a rod 34 described later. The driver 16 moves in the X direction together with the X-axis moving body 13, but moves in the Y direction together with the Y-axis moving body 15 in the X direction.
It can move relative to the shaft moving body 13. It should be noted that as shown by the phantom lines in FIG.
A frame 20 that is long in the width direction (X direction) is above 0.
And a plurality of (four in the drawing) sewing machine heads 22 are arranged on the front surface of the frame 20.

FIG. 2 is an enlarged side sectional view showing one sewing machine head 22 and a holding frame driving device corresponding thereto, and FIG. 3 is a front view of FIG. As is apparent from FIG. 2, the sewing machine head 22 includes a needle bar case 24 slidably attached to a head arm 23 fixed to the frame 20. The needle bar case 24 is provided with a plurality of needle bars 26 (four in the drawing) having sewing needles 28 at the lower end, as shown in FIG. These needle bars 2
Of the six needle bars, only one needle bar selected by sliding the needle bar case 24, for example, the needle bar 26 shown by the solid line in the drawing is driven up and down. By the cooperation of the sewing needle 28 of the needle bar 26 that is vertically driven and the shuttle (not shown) that is rotationally driven in synchronization with this, an upper thread and a lower thread are applied to the cloth 70 to be sewn, which will be described later. It is well known that stitches by entanglement are formed and sewing (embroidery) is performed.

FIG. 4 is a plan view of the holding frame driving device, and FIG. 5 is a perspective view of the holding frame driving device. As is clear from these drawings, one rod 34 is supported on the front surface of the Y-axis moving body 15 by a plurality of support brackets 36 so as to be movable in the X direction. One end of the rod 34 is connected to the driver 16 as already described, and is driven in the X direction by the reciprocating movement of the X-axis moving body 13.

The sewing machine head 2 is attached to the rod 34.
The support 30 is attached at a position corresponding to 2. The support 30 has a rectangular frame shape, and two left and right portions thereof are respectively connected to the rod 34 via connection blocks 32. The rod 34 moves in the Y direction by the reciprocating movement of the Y-axis moving body 15, and moves in the X direction relative to the Y-axis moving body 15 in conjunction with the reciprocating movement of the X-axis moving body 13. That is, the rod 34 functions as a driving body that moves in both X and Y directions, and the support body 30 connected to the rod 34 also moves in both X and Y directions. As shown in FIGS. 2 and 3, felts 31 are attached to the four corners of the lower surface of the support 30 so that the support 3 is placed on the surface of the sewing machine table 10.
It is considered that 0 moves smoothly.

On the upper surface of the support body 30, the outer peripheral portion of the curved holding frame 40 is supported. The holding frame 40 includes a receiving frame 41 and a pressing frame 46. The receiving frame 41 includes the receiving surface 43 and the rising portion 4
Both ends of the two members having an L-shaped cross section having 4 and
It has a frame structure that is connected to each other by a connecting rod 42. Further, the receiving frame 41 and the support body 30 are connected to each other at two positions before and after the receiving frame 41 by a total of four connecting members 50 and 51 forming a pair on the left and right. On the other hand, the holding frame 46 is formed in a frame shape that is in contact with the receiving surface 43 of the receiving frame 41. Hook portions 47, which are detachably engaged with the connecting rod 42 of the receiving frame 41, are integrally formed at both left and right ends of the holding frame 46.

FIG. 6 is a perspective view showing the pair of coupling members 50 and 51 in the assembled state. As is clear from this figure, the connecting members 50 and 51 are each formed in a strip shape. Moreover, these connecting members 50, 51
For this, a flexible material such as a stainless steel plate is used. Slotted screw holes 54 and 55 are formed at both ends of both coupling members 50 and 51, and an opening 52 is formed in one coupling member 50 over substantially the entire region except both ends in the length direction. Are formed. On the other hand, the other coupling member 51 has the opening 5 of the coupling member 50 over substantially the entire area in the length direction except both ends thereof.
The width is set to fit in 2.

One end portion of the pair of coupling members 50 and 51 is coupled with a screw at a location on the opposite side opposite to the support body 30, and the other end portion is coupled to the receiving frame 41. The outer peripheral portions on the opposite sides opposite to each other are coupled with screws. As a result, the receiving frame 41, that is, the holding frame 40, can move together with the support body 30, and can roll with respect to the support body 30 while flexing the pair of coupling members 50 and 51 to opposite sides. However, since the relative positions of these connecting members 50 and 51 with respect to the support 30 and the holding frame 40 do not change, the displacement of the holding frame 40 with respect to the support 30 and the lifting of the holding frame 40 are limited. The screw holes 54 and 55 are used for screwing the connecting members 50 and 51 to the support body 30 and the receiving frame 41. Each screw hole 54 and 55 has a long hole shape, and the connecting position by the screw is adjusted. Is possible. As a result, both coupling members 50 and 51 are attached with a predetermined tension applied.

A pressing roller 60 with a groove is rotatably supported on a roller supporting member 62 fixed to the upper surface of the Y-axis moving member 15 with a bolt 64. This press roller 60
The rotation center of is perpendicular to the front surface of the Y-axis moving body 15 and passes directly below the sewing needle 28 on the needle bar 26 selected by the sliding of the needle bar case 24, that is, the needle drop point A shown in FIG. It is located in the vertical plane. The groove of the pressing roller 60 is engaged with the rising portion 44 on the rear surface side of the receiving frame 41. When the support 30 moves together with the holding frame 40 in the X direction, the receiving frame 41 rolls so that the outer periphery of the portion corresponding to the pressing roller 60 contacts the support 30. Become.
As described above, by the pressing roller 60 supported by the Y-axis moving body 15 which moves relatively to the support body 30 in the X direction, the outer periphery of the portion of the receiving frame 41 corresponding to the needle drop point A is the support body 30. A mechanism for rolling is configured so as to come into contact with the side.

FIG. 7 shows a receiving frame 41 of the holding frame 40.
FIG. 8 is a perspective view showing a separated state of the press frame 46 and the holding frame 46 together with the cloth 70 to be sewn. As shown in this figure, the cloth to be sewn 70 is one in which only two pieces constituting the eaves portion of the cap (cap) are sewn together, and of course has a curved shape as a whole. By holding the edge portion of the sewn cloth 70 between the receiving surface 43 of the receiving frame 41 and the pressing frame 46, the sewn cloth 70 is set in the holding frame 40 in a substantially curved shape. . The sewn cloth 70
In the above, the portion 70a corresponding to the top of the hat is pressed to the side of the holding frame 40 by a holding tool (not shown) so as not to interfere with the sewing when the cloth 70 to be sewn is set on the holding frame 40.

Next, the driving of the holding frame 40 when sewing (embroidering) the cloth 70 to be sewn will be described. First, when the sewing machine 70 is set on the holding frame 40 and then the sewing machine is started, the X-axis drive unit 12 and the Y-axis drive unit 14 are reciprocally driven in the respective directions based on the frame drive data. In conjunction with these, the X-axis moving body 13
And the Y-axis moving body 15 reciprocates in the Y direction. As a result, as described above, the rod 34
Moves in both X and Y directions together with the support 30.

Due to the movement of the support 30, the holding frame 40 also moves in both X and Y directions. Moreover, the holding frame 40 rolls along with its movement in the X direction so that the outer circumference of the receiving frame 41 is always in contact with the support body 30 at the position corresponding to the needle drop point A by the function of the pressing roller 60. To do. Therefore, even when the cloth 70 to be sewn is set in a curved state, at the needle drop point A, the sewing needle 28 is inserted substantially at right angles to the material surface of the cloth 70 to be sewn, and the sewing is satisfactorily performed.

Embodiment 2 FIG. 8 is a plan view showing a multi-head sewing machine according to Embodiment 2.
In this embodiment, an original frame 84 is provided on the upper surface of the sewing machine table 10 so as to reciprocate in both the X and Y directions in association with the driving of the X-axis drive unit 12 and the Y-axis drive unit 14. The original frame 84 is a driving body which replaces the rod 34 of the first embodiment, and a supporting body 80 is detachably connected to the driving frame at a position corresponding to the sewing machine head 22.

FIG. 9 is an enlarged side sectional view showing one sewing machine head 22 and a holding frame drive device corresponding thereto, and FIG. 10 is a front view of FIG. 11 is a plan view of the holding frame driving device, and FIG. 12 is a perspective view of the holding frame driving device. As is clear from these figures, the support 80 is
Like the support 30 of the first embodiment, it has a rectangular frame shape, and the back side piece 84a and the front side piece 84b of the original frame 84.
, And are detachably coupled by a coupling tool 82 using a magnet. Felts 81 are also attached to the four corners of the lower surface of the support 80 in the same manner as in the first embodiment.

Since the supporting body 80 can be easily attached to and detached from the original fabric frame 84 by the respective connecting members 82, a normal flat cloth can be set on the original fabric frame 84 by removing the supporting body 80. In other words, it becomes easy to switch from the specification for the curved sewn cloth 70 to the specification for the flat cloth. Even when a flat cloth is set, there are a case where a large area of the cloth is directly set on the cloth frame 84 and a case where a plurality of embroidery frames having a small area of the cloth are set. is there.

On the upper surface of the support 80, a holding frame 40 having the same structure as that of the first embodiment is provided with a coupling member 50 similar to that of the first embodiment.
It is supported by 51. However, in the second embodiment, the directions of the support 80 and the holding frame 40 are opposite to those of the first embodiment in the X and Y directions. That is, Example 2
Then, when the support body 80 moves in the Y direction together with the holding frame 40, the support body 80 is always provided at a position where the outer circumference of the holding frame 40 (receiving frame 41) corresponds to the needle drop point A shown in FIG.
It will roll so as to contact the side of.

Next, the mechanism for rolling the holding frame 40 will be described. The grooved pressing rollers 90 are respectively engaged with the rising portions 44 on both the left and right sides of the receiving frame 41 constituting the holding frame 40. is doing. These presser rollers 90 are rotatably supported by respective roller supports 92 attached to the tips of the individual support arms 94. The center of rotation of both presser rollers 90 is parallel to the back side piece 84a and the front side piece 84b of the original fabric frame 84, and is located in a vertical plane passing through the needle drop point A shown in FIG. As a result, when the holding frame 40 moves in the Y direction, the holding frame 40 rolls as described above.

The respective base ends of the two support arms 94 are provided at both ends of two slide rods 95 supported slidably in the X direction with respect to a guide block 96 fixed to the lower surface of the frame 20. Are combined.
Therefore, the both pressing rollers 90 can move in the X direction together with the support 80 and the holding frame 40. Further, the roller support member 92 of the both pressing rollers 90 is supported by the both support arms 94 via respective support rods 97 which are vertically movably attached to the tip end portion of the support arm 94 as shown in FIG. Has been done. Then, the both pressing rollers 90 are constantly supported by the springs 98 mounted on the shafts of the respective support rods 97 so that the holding frame 41 of the holding frame 40 is constantly supported.
It is urged in the direction to hold down.

In the second embodiment, since the holding frame 40 rolls in the front-rear direction (Y direction) of the sewing machine head 22 as shown in FIG. 9, the number of needle bars 26 of each sewing machine head 22 is large. Even if the width in the left-right direction of the needle bar case 24 shown by 10 is increased, this does not affect the rolling amount of the holding frame 40. The members of the second embodiment that are considered to have the same or equivalent configurations as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment in the drawings, and duplicate description will be omitted. It should be noted that the same concept is applied to the third embodiment described below, and a duplicate description will be omitted.

Embodiment 3 FIG. 13 is a plan view showing a part of a holding frame driving device of Embodiment 3, and FIG. 14 is a sectional view taken along line BB of FIG. As is clear from these drawings, the present embodiment is a modification of the second embodiment. That is, the holding frame 40 is provided on the left and right sides of the upper surface of the support 80.
A guide rail 100 for guiding the rolling of the vehicle is formed. On the other hand, a guide groove 102 that fits into the guide rail 100 is formed on the lower surface of the receiving frame 41 that constitutes the holding frame 40. By forming these guide grooves 102, a pressing roller 9 with a groove is arranged in the same manner as in the second embodiment with respect to the convex portion that bulges toward the upper surface side of the receiving frame 41.
0 is engaged. However, the shape of the groove of the both pressing rollers 90 is changed according to the shape of the convex portion of the receiving frame 41.

According to the third embodiment, the rolling movement of the holding frame 40 (receiving frame 41) with respect to the support body 80 is guided by the guide rail 100 and the guide groove 102 fitted therein, so that it is more stable. Rolling is performed. Moreover, since the receiving frame 41 is pressed by the both pressing rollers 90 on the left and right sides thereof, the connecting members 50 and 51 may be omitted in this embodiment. Further, the guide rail 100 and the guide groove 102 can be applied to the support 30 of the first embodiment and the receiving frame 41 of the holding frame 40, respectively. Incidentally, the connecting members 50, 5 in each of the above-mentioned embodiments
1 is not limited to a strip plate shape, and may be replaced with, for example, a wire or the like.

[0027]

According to the present invention, a curved cloth to be sewn can be set in the holding frame without any difficulty in its shape, and the sewing needle can be inserted at a right angle to the material surface at the needle drop point. , The sewing condition such as embroidery is improved and the quality is improved. Further, according to the present invention, the relative displacement of the holding frame with respect to the support and the lifting of the holding frame are prevented, and the holding frame is always appropriately driven and controlled based on the frame driving data, which also maintains good sewing work. .

[Brief description of drawings]

FIG. 1 is a plan view showing a multi-head sewing machine.

FIG. 2 is an enlarged side sectional view showing one sewing machine head and a holding frame drive device corresponding thereto.

FIG. 3 is a front view of FIG.

FIG. 4 is a plan view showing a holding frame driving device.

FIG. 5 is a perspective view showing a holding frame driving device in the same manner.

FIG. 6 is a perspective view showing a pair of coupling members in a posture when they are assembled.

FIG. 7 is a perspective view showing the holding frame in a separated state together with the cloth to be sewn.

FIG. 8 is a plan view showing a multi-head type sewing machine according to a second embodiment.

FIG. 9 is a side sectional view showing, on an enlarged scale, a sewing machine head of Embodiment 2 and a holding frame drive device corresponding thereto.

FIG. 10 is a front view of FIG. 9.

FIG. 11 is a plan view showing a holding frame driving device according to a second embodiment.

FIG. 12 is a perspective view showing a holding frame drive device according to the second embodiment as well.

FIG. 13 is a plan view showing a part of the holding frame drive device according to the third embodiment.

14 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 30, 80 Support 40 Holding frame 50, 51 Coupling member 70 Sewing cloth A Needle drop point

Claims (1)

[Claims] 1. A support provided to move in both X and Y directions based on frame drive data for sewing, and a curved cloth to be sewn are formed in a curved shape that can be set in substantially the same shape. And a holding frame whose outer peripheral part is rotatably supported with respect to the support and movable together with the support in both X and Y directions, and movement of the support in either X or Y direction. And a mechanism for rolling the holding frame such that the outer peripheral portion of the portion corresponding to the needle drop point of the sewing machine is always in contact with the side of the support body. apparatus.