JP3667420B2 - sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing machine having a function of forming a kind of embroidery pattern by piercing a boring knife into a workpiece such as a cloth and then sewing the periphery of an incised hole.
[0002]
[Prior art]
In a generally known multi-needle type sewing machine, a plurality of needle bars are supported in a vertically movable manner on a needle bar case that is slidably mounted on the sewing machine head, and is selected by a sliding operation of the needle bar case. One needle bar is reciprocated up and down by a needle bar drive mechanism to perform the sewing work. Some multi-needle type sewing machines have a boring knife attached to one of a plurality of needle bars instead of the sewing needle attached to the lower end thereof.
In this configuration, by sliding the needle bar case, first, a needle bar to which the boring knife is attached (hereinafter referred to as a knife bar) is selected. Then, the knife bar is driven to reciprocate up and down by a needle bar drive mechanism, and a boring knife is pierced into the workpiece to perform drilling. Next, an arbitrary needle bar is selected by a sliding operation of the needle bar case, and the needle bar is reciprocated up and down by a needle bar drive mechanism, so that the hole is stitched around the hole and a predetermined embroidery pattern (boring pattern) is obtained. ) Can be formed.
[0003]
By the way, the boring knife has a shape in which the size of the hole is adjusted according to the piercing depth to the workpiece. Therefore, if the driving stroke of the knife bar can be changed, it is possible to flexibly cope with the shape of the boring pattern.
Further, since the workpiece (embroidery cloth) is normally held in a state of being stretched on the embroidery frame, when the boring knife is inserted into the workpiece and incised, the workpiece is deformed by tension. For this reason, when forming a plurality of boring patterns, if a plurality of holes are first drilled in the work piece by the boring work, the deformation of the work piece will increase and hinder subsequent sewing work. become. Therefore, a work procedure is usually employed in which boring patterns are finished one by one by alternately performing drilling processing by boring work and overlock sewing around the hole by sewing work.
[0004]
[Problems to be solved by the invention]
However, in the above-described prior art, both the needle bar and the female bar supported by the needle bar case are reciprocated up and down by the needle bar drive mechanism, so that their drive strokes are constant. As a result, the piercing depth of the boring knife relative to the workpiece cannot be adjusted during the boring operation, and processing corresponding to the properties of the workpiece and the form of the boring pattern cannot be performed.
When a plurality of boring patterns are formed, the start and end of the sewing work is repeated each time to finish the boring patterns one by one for the reasons described above. At the start and end of this sewing operation, it is necessary to reduce the sewing speed by the needle bar. Since this speed reduction is performed for each boring pattern, the operating efficiency of the sewing machine is lowered.
[0005]
One object of the present invention is to make it possible to change the stroke of the knife bar during boring work, and to adjust the depth of piercing of the boring knife to the work piece to flexibly cope with the nature of the work piece and the form of the boring pattern. Is to realize.
Another object of the present invention is to eliminate the need to reduce the sewing speed at the start and end of the sewing operation using the needle bar, and to increase the operating efficiency of the sewing machine when forming a plurality of boring patterns.
Still another object of the present invention is to shorten the time required for switching between a sewing operation and a boring operation for a workpiece and to improve the operation efficiency.
[0006]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a sewing machine in which a needle bar supported so as to be movable up and down with respect to the sewing head is reciprocated up and down by a needle bar drive mechanism and its drive source. The rod is supported so that it can move up and down, and a knife bar drive mechanism for driving the knife bar up and down and its drive source are provided separately from the needle bar drive mechanism and its drive source. The reciprocating drive stroke can be changed.
Therefore, if you change the reciprocating drive stroke of this knife bar, you can adjust the hole size by changing the depth of the drilling knife to the workpiece, and you can flexibly deal with the nature of the workpiece and the shape of the boring pattern. It becomes.
[0007]
According to a second aspect of the present invention, the sewing machine according to the first aspect of the invention is provided with a jump mechanism capable of transmitting or blocking the driving force from the needle bar driving mechanism to the needle bar, and performing a boring operation for piercing a boring knife into a workpiece. The needle bar drive mechanism is set to stop the reciprocating drive of the needle bar by the control of the jump mechanism while maintaining the drive state by the drive source, and to reciprocate the knife bar by the female bar drive mechanism. It is characterized by.
Accordingly, it is possible to perform the boring operation by reciprocating driving of the scalpel bar while the needle bar driving mechanism is in the driving state. This means that when finishing a plurality of boring patterns one by one, it is not necessary to reduce the sewing speed at the start and end of the sewing operation with the needle bar, and the operating efficiency of the sewing machine is improved.
[0008]
According to a third invention, in the sewing machine according to the first invention, each of the needle bar and the female bar for the workpiece is controlled by the movement control of the workpiece when switching between the sewing operation and the boring operation for the workpiece. The position can be set.
As described above, the time required for switching between the sewing work and the boring work by moving the workpiece is shortened compared with the time required for switching by the sliding operation of the needle bar case.
[0009]
According to a fourth aspect of the present invention, in the sewing machine of the first aspect, the sewing head is mounted on the head main body so as to be slidable with respect to the head main body, and the needle bar case is supported so as to be vertically movable. And a female bar is supported on the head body so as to be movable up and down.
As a result, it is sufficient that the needle bar case has a space for supporting the number of needle bars required for the sewing machine.
[0010]
According to a fifth aspect of the present invention, in the sewing machine of the first aspect, the sewing machine head is mounted on the head main body so as to be slidable with respect to the head main body, and the needle bar case is supported so as to be movable up and down. The needle bar case is supported by a needle bar so as to be movable up and down.
As a result, the offset between the needle bar and the female bar is only in one direction, and switching control between the sewing work and the boring work is simplified.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. In the following description, the present invention is applied to a multi-head embroidery sewing machine.
Embodiment 1
FIG. 1 is a sectional view of the sewing head 10. The sewing machine head 10 includes a sewing machine arm 12 (head body) fixed to the front surface of the sewing machine frame 84, and a needle bar case 14 supported so as to be slidable laterally with respect to the front surface portion of the sewing machine arm 12. It has. The sewing machine frame 84 extends horizontally in the horizontal direction, and a plurality of the sewing heads 10 are provided along the horizontal direction.
[0012]
A needle bar 16 is supported on the needle bar case 14 so as to be movable up and down, and a sewing needle 18 is attached to a lower end portion of the needle bar 16. The needle bar 16 is provided with a spring 20 at its upper portion for holding the needle bar 16 together with the sewing needle 18 at the top dead center. A needle bar holder 22 having a pin 23 protruding rearward is fixed to a substantially middle part of the needle bar 16 in the vertical direction. A plurality (six) of needle bars 16 having such a configuration are provided at equal intervals along the sliding direction of the needle bar case 14.
[0013]
On the other hand, the sewing machine arm 12 is provided with a needle bar drive mechanism 30 for reciprocally driving one of the needle bars 16 up and down. The needle bar drive mechanism 30 is constituted by a link mechanism that is driven by the rotation of a needle bar drive cam fixed on the axis of the sewing machine main shaft 24. The sewing machine main shaft 24 is supported by penetrating the sewing machine arm 12 of each sewing head 10 and is driven to rotate in one direction by a motor (not shown) which is a driving source of the needle bar driving mechanism 30. Yes.
[0014]
FIG. 2 is a front view showing the sewing head 10 with the needle bar case 14 removed. A base needle bar 31 is vertically supported by the sewing machine arm 12 at a substantially central portion in the left-right direction of the drawing. A drive member 32 assembled on the shaft of the base needle bar 31 so as to be movable up and down is connected to the needle bar drive mechanism 30 as shown in FIG. Therefore, the drive member 32 is reciprocated up and down with a predetermined stroke on the axis of the base needle bar 31 by the drive of the needle bar drive mechanism 30.
[0015]
The drive member 32 includes a drive element 36 that also serves as a component of a jump mechanism 34 described below. With respect to the concave portion 37 formed on the front surface portion of the driver 36, the pin 23 of the needle bar holder 22 in the one needle bar 16 selected by the sliding operation of the needle bar case 14 is laterally viewed. Engageable. Only the needle bar 16 in which the pin 23 of the needle bar holder 22 is engaged with the recess 37 of the driver 36, that is, only the selected needle bar 16 is reciprocated up and down in conjunction with the drive member 32. The driver 36 is rotatable about the axis of the base needle bar 31, but normally receives a spring force for holding the concave portion 37 at the rotational position of FIGS.
[0016]
The jump mechanism 34 is a mechanism for transmitting or blocking the driving force from the driving member 32 of the needle bar driving mechanism 30 to the selected needle bar 16, and controls the driving element 36 by driving control of the motor 40 shown in FIG. The base needle bar 31 is rotated around the axis. Specifically, the lever 42 fixed to the output shaft 41 (FIG. 1) of the motor 40 is rotated from the solid line position of FIG.
[0017]
An engaging rod 38 that is long in the vertical direction is formed on the side of the driver 36. Therefore, even when the drive member 32 is being reciprocated, when the lever 42 is rotated to the phantom line position in FIG. 1, the free end (roller) of the lever 42 contacts somewhere in the vertical direction of the engagement rod 38. Thus, the driver 36 is rotated around the axis of the base needle bar 31. As a result, the concave portion 37 of the drive element 36 is disengaged from the pin 23 of the needle bar holder 22, the power transmission from the drive member 32 to the needle bar 16 is interrupted, and the needle bar 16 enters a jump state. If the lever 42 is returned to the solid line position in FIG. 1, the driver 36 is returned to the original rotational position by the spring force, and the jump state of the needle bar 16 is released.
As shown in FIGS. 1 and 2, a needle plate 80 positioned below the sewing head 10 has a needle hole 81 for the sewing needle 18 of the needle bar 16 to descend, and a female member 52 to be described next. The boring knife 53 has a knife hole 82 for lowering.
[0018]
A female bar 50 having a female member 52 at the lower end is disposed on the right side of the base needle bar 31. As apparent from FIG. 2, the female bar 50 is supported by an upper and lower support portion 46 that integrally projects from the support plate 44 attached to the right side surface of the sewing machine arm 12 to the inside of the sewing machine arm 12. ing.
FIG. 3 is an enlarged side view of the support plate 44 shown in FIG. As is apparent from this drawing, a female rod holding member 58 having a pin 59 protruding in the lateral direction is fixed to a substantially intermediate portion of the female rod 50 in the vertical direction. The tip of the pin 59 is connected to the knife drive mechanism 60 through the slit 48 formed in the support plate 44 in the vertical direction and outside the support plate 44.
[0019]
A motor 62 that is a drive source of the knife drive mechanism 60 is fixed to the outer surface of the support plate 44 by a bracket 64. The female drive mechanism 60 includes a drive lever 66 whose one end is fixed to the output shaft 63 of the motor 62, and a pivot whose base end is rotatably supported by the shaft 68 (FIG. 3) with respect to the support plate 44. Lever 67. As shown in FIG. 3, the other end of the drive lever 66 and the substantially intermediate portion of the rotating lever 67 are connected by a connecting lever 69, and the tip of the rotating lever 67 and the pin 59 of the female rod holder 58 are connected to each other. Are connected by a connecting lever 70.
[0020]
3 shows a state in which the knife rod 50 is raised to the retracted position. At this time, the drive lever 66 in the knife drive mechanism 60 rotates to a position where it abuts against a stopper 71 fixed to the bracket 64 of the motor 62. (Clockwise direction). In this state, the drive lever 66 and the connecting lever 69 overlap with each other in a straight line, so that even if the holding current of the motor 62 is interrupted, the female bar 50 in the retracted position does not descend due to its own weight or the like.
[0021]
FIG. 4 is an enlarged cross-sectional view of the female member 52 of the female bar 50. The female member 52 includes a boring knife 53 and a presser 55. The boring knife 53 is concentrically coupled with the female bar 50 by inserting the upper end of the shaft part 53 a into the axial hole of the coupler 54 fixed to the lower end of the female bar 50.
The presser 55 can move up and down with respect to the shaft portion 53 a of the boring knife 53 between the coupler 54 and the blade portion of the boring knife 53. However, due to the urging force of the spring 57 provided between the presser 55 and the coupler 54, the presser 55 covers the blade portion in the state of FIG. 4 in contact with the upper end surface of the blade portion of the boring knife 53. A cushion ring 56 is provided on the lower end surface of the presser 55.
[0022]
FIG. 5 is a side view showing the state during the boring operation in correspondence with FIG. When the boring operation is performed, the output shaft 63 of the motor 62 that is the drive source of the knife drive mechanism 60 is reciprocally rotated, so that the drive lever 66 and the rotation lever 67 of the knife drive mechanism 60 are changed from the phantom line to the solid line in FIG. It is reciprocated within the range indicated by. In conjunction with this, the female bar 50 is reciprocated between the top dead center indicated by the virtual line and the bottom dead center indicated by the solid line together with the female member 52.
[0023]
FIG. 6 is an enlarged cross-sectional view of the female member 52 during the boring operation. When the knife member 52 is in the downward stroke during the boring operation, as shown in FIG. 6 (A), the cushion ring on the lower end surface of the presser 55 immediately before the boring knife 53 pierces the embroidery cloth 90 as the workpiece. The embroidery cloth 90 is pressed by 56. The embroidery cloth 90 at this time is received by a receiving member 83 such as a synthetic rubber provided around the female hole 82 of the needle plate 80.
Thereafter, as shown in FIG. 6B, the boring knife 53 pierces the embroidery cloth 90, and the embroidery cloth 90 is incised thereby. In the upward stroke of the female member 52, the embroidery cloth 90 is pressed by the presser 55 until the boring knife 53 is completely removed from the embroidery cloth 90.
[0024]
Next, the formation of the boring pattern will be described.
FIG. 7 shows an embroidery cloth 90 on which a plurality of bowling patterns 100 are created. In order to form one of these boring patterns 100, first, the boring knife 53 is sequentially inserted into each point a in FIG. 8A by boring work, and the embroidery cloth 90 is incised, and FIG. A hole 102 is made as shown in FIG.
Next, the sewing needles 18 are alternately dropped at the needle drop points b and c between the hole 102 and the outer peripheral portion thereof by sewing work, and overlock stitching (satin stitch) is performed. As a result, as shown in FIG. 8C, a boring pattern 100 is formed in which the periphery of the hole 102 is stitched with the thread 103.
[0025]
As described above, the boring work and the overlock stitching by the sewing work are alternately performed to finish the boring pattern 100 one by one. Switching between the boring work and the sewing work is performed as follows.
In other words, when the sewing machine is started, the sewing machine main shaft 24 is rotated, and at the same time, a jump command is issued to operate the jump mechanism 34 so that the needle bar 16 is in a jump state. Therefore, the motor 62 of the knife driving mechanism 60 is driven to reciprocate the knife bar 50 up and down, and the hole 102 is made in the embroidery cloth 90 by the boring knife 53 as described above.
[0026]
When the boring operation is completed, the knife 50 is held at the top dead center position indicated by the phantom line in FIG. 5, and the first sewing operation is performed by controlling the movement of the embroidery frame (not shown) on which the embroidery cloth 90 is stretched. The embroidery cloth 90 is moved so that the needle drop point is aligned with the needle hole 81 of the needle plate 80. Here, the jump state of the needle bar 16 is canceled and the overlock stitching is performed as described above. When the sewing reaches the end point, the jump mechanism 34 is operated again to bring the needle bar 16 into the jump state, and the vertical driving of the needle bar 16 is stopped without stopping the sewing machine main shaft 24. At this point, the formation of the first boring pattern 100 is completed.
[0027]
Subsequently, the embroidery cloth 90 is moved by controlling the movement of the embroidery frame so that the piercing start position by the boring knife 53 for forming the second boring pattern 100 matches the knife hole 82 of the needle plate 80. Thereafter, the boring pattern 100, the embroidery frame movement control, and the sewing operation are sequentially performed in the same manner as described above to form a plurality of boring patterns 100.
Thus, when switching from the sewing work to the boring work, the driving of the needle bar 16 is stopped by the jump mechanism 34 and the movement of the embroidery frame is controlled, and then the female bar 50 can be driven immediately. Further, when switching from the boring operation to the sewing operation, the needle bar 16 can be immediately driven by releasing the jump state after controlling the movement of the embroidery frame after stopping the driving of the knife bar 50.
[0028]
That is, it is not necessary to stop the rotation of the sewing machine spindle 24 during the boring operation, and it is not necessary to reduce the sewing speed at the start and end of the sewing operation, so that the operation efficiency is improved. However, if there is a thread trimming request at the end of the sewing operation, the sewing machine spindle 24 is stopped before the boring operation is started. However, even in this case, the switching between the boring operation and the sewing operation is performed by the movement control of the embroidery frame as described above, so that the time is shortened compared with the switching by the sliding operation of the needle bar case 14, and the operation efficiency is correspondingly reduced. Is enhanced.
[0029]
Regarding the boring operation, the reciprocating drive stroke of the scalpel bar 50 can be adjusted by changing the reciprocating drive amount of the motor 62 in the scalpel drive mechanism 60. Accordingly, the piercing depth of the boring knife 53 with respect to the embroidery cloth 90 is changed, and the size of the hole 102 is adjusted, so that the properties of the embroidery cloth 90 and the shape of the boring pattern 100 can be flexibly dealt with.
[0030]
Embodiment 2
9 is a cross-sectional view showing the sewing head 10 of the second embodiment, FIG. 10 is a front view showing the sewing head 10 with the needle bar case 14 removed, and FIG. 11 is a front view of the needle bar case 14. . Although this needle bar case 14 is for six needles, a female bar 150 is supported at the right end support portion so as to be able to move up and down instead of the needle bar 16 (FIG. 11). It has become.
A female member 152 similar to that of the first embodiment is attached to the lower end portion of the female bar 150. The female bar 150 is held at the retracted position shown in FIGS. 9 and 11 by the urging force of the spring 151 provided on the upper part thereof. The retracted position of the knife bar 150 is restricted by the coupling tool 154 that couples the knife member 152 and the knife bar 150 coming into contact with the needle bar case 14 via the cushion 156. Moreover, a passive member 158 having a recess 159 on the rear side is fixed on the axis of the female bar 150.
[0031]
On the other hand, on the right side of the base needle bar 31, a base bar 110 for the female bar 150 is vertically supported by a support plate 44 attached to the right side surface of the sewing machine arm 12 so as to be integrally extended to the inside of the sewing machine arm 12. 46 (FIG. 10). A driving body 112 is supported on the shaft of the base rod 110 so as to be movable up and down, and a projection 113 that can be engaged with the concave portion 159 of the passive member 158 from the lateral direction is fixed to the front surface thereof. A pin 114 is fixed to the right side surface of the driver 112. The pin 114 is connected to a female drive mechanism 60 similar to that of the first embodiment through a vertically elongated slit 48 formed in the support plate 44.
FIG. 12 is a side view showing the location of the support plate 44 in FIG.
[0032]
In the second embodiment, when the needle bar case 14 is slid leftward as viewed from the front surface of the sewing head 10, the recess 159 of the passive member 158 of the female bar 150 causes the protrusion of the driver 112 of the base bar 110. The knife rod 150 can be reciprocated up and down by the knife drive mechanism 60. In addition, at this time, the needle bar 16A (first needle) located on the rightmost side in FIG. 11 among the needle bars 16 is set to be driven by the needle bar drive mechanism 30.
[0033]
In order to form a boring pattern, first, the knife rod 150 is reciprocated by the knife driving mechanism 60 to perform the boring operation, and then the embroidery cloth 90 is moved in the same manner as described above by controlling the embroidery frame, and the needle The bar 16A is driven by the needle bar drive mechanism 30 to perform over stitching. Also in this case, it is not necessary to stop the sewing machine main shaft 24 each time by operating the jump mechanism 34 to bring the needle bar 16A into the jump state during the boring operation.
However, in order to perform multi-color overlock sewing using not only the needle bar 16A (first needle) but also other needle bars 16 in the sewing operation (overlock sewing), when switching between the boring operation and the sewing operation, The needle bar case 14 needs to be slid, and the sewing machine spindle 24 must be temporarily stopped. However, it is very rare to form a boring pattern by multi-colored overlock.
[0034]
In order to enable the knife bar 150 to be driven by the slide operation of the needle bar case 14, the sewing machine is moved when the drive member 32 of the needle bar drive mechanism 30 is slightly lowered from its top dead center as shown in FIG. The rotation of the main shaft 24 is stopped. Each needle bar 16, including the needle bar 16 that has been selected so as to be drivable by the needle bar drive mechanism 30, by issuing a signal for operating the jump mechanism 34 immediately before the sewing machine main shaft 24 is stopped. Is held at top dead center.
[0035]
On the other hand, the female bar 150 is held in the retracted position by the urging force of the spring 151, and the female drive mechanism 60 is also in the retracted position shown in FIG. At this time, the recess 159 of the passive member 158 in the scalpel bar 150 is positioned below the driver 36 of the needle bar drive mechanism 30 and at the same height as the protrusion 113 of the driver on the base bar 110. .
If the needle bar case 14 is slid under such conditions and the recess 159 of the passive member 158 of the female bar 150 is engaged with the protrusion 113 of the driving body of the base bar 110, a boring operation can be performed. When the jump control is released, the concave portion 37 of the driver 36 of the needle bar drive mechanism 30 and the pin 23 of the needle bar holder 22 in the needle bar 16A are engaged, and the sewing operation by the needle bar 16A becomes possible.
[0036]
【The invention's effect】
The present invention can adjust the size of the hole by changing the piercing depth of the boring knife with respect to the workpiece, so that it is possible to flexibly cope with the properties of the workpiece and the shape of the boring pattern.
[Brief description of the drawings]
FIG. 1 is a sectional view of a sewing head.
FIG. 2 is a front view showing a sewing machine head with a needle bar case removed.
3 is an enlarged side view of a portion of the support plate in FIG. 2. FIG.
FIG. 4 is an enlarged cross-sectional view of a part of a female bar.
FIG. 5 is a side view showing a state during boring work in correspondence with FIG.
FIG. 6 is an enlarged cross-sectional view of a female member during a boring operation.
FIG. 7 is a plan view of an embroidery cloth on which a plurality of bowling patterns are created.
FIG. 8 is an explanatory diagram showing the machining process of one boring pattern.
FIG. 9 is a cross-sectional view of the sewing head in the second embodiment.
FIG. 10 is a front view showing a state in which the needle bar case is removed in the second embodiment.
FIG. 11 is a front view showing only a needle bar case in the second embodiment.
12 is a side view showing a portion of the support plate of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Sewing head 12 Sewing machine arm 14 Needle bar case 16 Needle bar 30 Needle bar drive mechanism 34 Jump mechanism 50,150 Female bar 53 Boring knife 60 Female drive mechanism 90 Embroidery cloth (workpiece)

Claims (5)

A needle bar supported so as to be movable up and down with respect to the sewing head is reciprocated up and down by a needle bar drive mechanism and its drive source, and the workpiece is moved and controlled in synchronization with the reciprocal drive of the needle bar. In a sewing machine that performs sewing, a female bar provided with a boring knife is supported on the sewing machine head so as to be movable up and down, and a female bar drive mechanism that drives the female bar to reciprocate up and down, and its drive source includes a needle bar drive mechanism The sewing machine is provided separately from the drive source thereof and is capable of changing the reciprocating drive stroke of the scalpel bar by the scalpel bar drive mechanism. The sewing machine according to claim 1, further comprising a jump mechanism capable of transmitting or interrupting a driving force from the needle bar driving mechanism to the needle bar, and for performing a boring operation for inserting a boring knife into a workpiece, The sewing machine is configured to stop the reciprocating drive of the needle bar by the control of the jump mechanism while maintaining the driving state by the drive source, and to reciprocate the knife bar by the scalpel bar driving mechanism. In the sewing machine according to claim 1, when the sewing work and the boring work are switched between the work pieces, the respective positions of the needle bar and the female bar with respect to the work piece can be set by the movement control of the work piece. A sewing machine characterized by 2. The sewing machine according to claim 1, wherein the sewing machine head includes a head main body, and a needle bar case that is mounted on the head main body so as to be slidable and supported so that the needle bar can move up and down. A sewing machine characterized in that a female bar is supported so as to be movable up and down. 2. The sewing machine according to claim 1, wherein the sewing head includes a head main body and a needle bar case that is slidably mounted on the head main body and that is supported so that the needle bar can be moved up and down. A sewing machine characterized in that a female bar is supported by a case so as to be movable up and down.

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