JP3817039B2 - Embroidery sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an embroidery sewing machine for embroidery sewing various patterns.
[0002]
[Prior art]
In general, a household zigzag sewing machine uses a needle having a threading hole through which an upper thread is passed in a direction perpendicular to the needle swinging direction (feeding direction by the feed dog). When the needle moves up in conjunction with the main shaft, the upper thread in front of the needle threading hole is pulled up by a balance similarly linked with the sewing machine main shaft to absorb the excess upper thread to form a seam.
[0003]
In recent years, in such a zigzag sewing machine, an embroidery frame holding a cloth is used in a direction along the needle swinging direction and a direction along the cloth feeding direction based on a pattern data instruction using a driving member such as a stepping motor. What is synthesized is one that performs embroidery sewing while moving in the so-called XY direction.
[0004]
The cloth feed direction by the normal feed dog is synchronized with the main spindle of the sewing machine, that is, it is gradually fed by a substantially elliptical locus synchronized with the vertical movement of the needle, whereas the movement of the embroidery frame by this stepping motor It happens immediately when it rises above the cloth on the board.
[0005]
[Problems to be solved by the invention]
When the embroidery frame is moved from the previous needle drop point to the next needle drop point during the formation of the embroidery pattern based on the pattern data, if the movement direction is along the penetration direction of the needle threading hole, the needle In some cases, the tip pierces the needle thread and the upper thread connected to the previous needle drop point. This is because as soon as the needle rises above the cloth, the embroidery frame moves in the above direction, the needle then descends from the top dead center and the balance pulls up the upper thread (as is well known, the balance is more in phase than the needle). As the embroidery frame moves to the next needle drop position, the upper thread connected to the previous needle drop point faces the needle lowering path as shown in FIG. However, the needle tip pierces the upper thread and falls, causing the twist of the upper thread to entangle with the needle, causing the thread to break up, causing thread breakage, and reducing the quality of the sewing product. In other words, the work efficiency is reduced due to the thread breakage repair.
[0006]
Therefore, an object of the present invention is to provide an embroidery sewing machine that can stably perform embroidery sewing without causing thread breakage.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a needle having a threading hole penetrating in the horizontal direction in the vicinity of the needle tip and moving up and down in conjunction with a sewing machine drive source, and Needle swinging means for swinging in a direction perpendicular to the through direction of the hole, and an embroidery frame for holding the workpiece, and moving the embroidery frame in the XY direction while the needle is positioned on the cloth. A frame moving means for designating, a pattern storage means for storing pattern data for designating each needle drop position for each pattern, and a desired pattern is designated from various patterns stored in the pattern storage means In the embroidery sewing machine, comprising: a selection means for reading, and a control means for controlling the frame driving means and the needle swinging means so as to change the needle drop position based on the pattern data read by the selection means. Means said embroidery to the next needle entry point When the moving direction of toward the penetrating direction of the threading hole has a function to swing in a direction to separate the needle when moving before or movement of the embroidery frame from the swing position in front of the needle drop point.
[0008]
According to a second aspect of the present invention, the swing drive control unit according to the first aspect has a function of operating the needle swing mechanism while the balance pulls up the sewing thread.
[0009]
According to the first aspect of the present invention, the embroidery sewing is performed while the needle is separated from the thread path from the hook to the needle by the needle swinging operation performed for each needle in the moving direction of the embroidery frame. As a result, the needle thread avoidance phenomenon is prevented by the needle thread avoiding operation, and the embroidery sewing operation is stably continued.
[0010]
The needle thread avoiding operation by such a needle swinging operation is performed more reliably when the balance is pulling up the sewing thread, particularly as in claim 2.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments in which the present invention is applied to a sewing machine that can be used for both normal sewing and embroidery pattern sewing will be described below in detail with reference to the drawings.
[0012]
First, the overall structure of the embroidery sewing machine main body 1 will be described with reference to FIG. 1. An arm base 3 is provided so as to rise upward from the sewing machine bed 2. The sewing machine arm 4 is provided so as to extend above the position 2. The arm base 3 is provided with an LCD display plate 5 of a touch panel display device that combines various display functions and functions of operation switches.
[0013]
An embroidery device 6 as shown in FIG. 2 is detachably attached to the sewing machine bed 2 via a connector 6a. The embroidery device 6 moves an embroidery frame 7 (see FIG. 3), which will be described later, in the left-right direction (X direction) and the front-rear direction (Y direction) according to a predetermined program. Y drive section 6c.
[0014]
In the X drive unit 6b, the rotational drive force from the X pulse motor 6b1 disposed inside the embroidery device 6 is transmitted to the X drive shaft 6b2 through a predetermined gear train, and one end of the X drive shaft 6b2 is transmitted. The X drive timing belt 6b5 stretched between the X drive pulley 6b3 and the X tension pulley 6b4 is reciprocated in the left-right direction (X direction) by the X drive pulley 6b3 attached to the section. Has been. The X drive timing belt 6b5 is connected to a part of the carriage 8 held so as to be reciprocally movable in the X direction with respect to the sewing machine bed 2. The carriage is reciprocated by the X drive timing belt 6b5. 8 is also reciprocated in the X direction.
[0015]
The Y driving portion 6c is provided in the carriage 8, and the rotational driving force from the Y pulse motor 6c1 is transmitted to the Y driving pulley 6c2 through a predetermined gear train, and the Y driving pulley 6c2 The Y drive timing belt 6c4 stretched between the Y tension pulley 6c3 is configured to reciprocate in the front-rear direction (Y direction). A connecting member (not shown) for the embroidery frame 7 as shown in FIG. 3 is attached to the Y drive timing belt 6c4, and the embroidery frame 7 attached via the connecting member is the above-described one. The X drive unit 6b and the Y drive unit 6c are configured to be appropriately driven in the left-right direction (X direction) and the front-rear direction (Y direction). Both the drive units 6b and 6c start to move when the needle N rises in the cloth upward direction, as in the prior art.
[0016]
As shown in FIG. 3, the embroidery frame 7 is composed of an outer frame 7a and an inner frame 7b made of a substantially rectangular hollow frame, and a cloth or the like is provided between the frames 7a and 7b. The sewing product is moved in the left-right direction (X direction) and the front-rear direction (Y direction) together with the embroidery frame 7 while the sewing product is held by the embroidery frame 7 by being sandwiched by the sewing product. Has been made.
[0017]
The embroidery frame 7 is provided with an identification plate 7c for identifying the type of frame used, and the identification plate 7c is detected when the embroidery frame 7 is attached. As a result, the model in use is discriminated.
[0018]
Next, the embroidery sewing machine according to the present embodiment is provided with a needle swing mechanism as shown in FIG. This needle swinging mechanism is widely known in, for example, Japanese Patent Publication No. 4-55720 (Japanese Patent Application No. Sho 63-17561), and a detailed structural description thereof will be omitted. Keep it.
[0019]
That is, as shown in FIG. 4, the needle bar 11 holding the needle N is supported so as to be movable up and down with respect to the swing base 12, and the swing base 12 is 12 is attached so as to be swingable around a pin 12a provided at an upper end portion. Further, the swing link 15 extends from the output shaft of the needle swing motor 13 formed of a pulse motor or the like via the arm 14 so as to be substantially horizontal and then bend downward. The swing link 15 The front end portion of the oscillating plate 12 is rotatably connected to the middle portion of the oscillating base 12.
[0020]
When the needle swing motor 13 is reciprocated within the needle swing section T, the swing base 12 is swung back and forth in the left-right direction (X direction). It is configured to reciprocate in the direction (X direction). Although not shown, the sewing machine is provided with a conventionally known balance that moves up and down in conjunction with the main spindle of the sewing machine.
[0021]
Next, embroidery sewing control means for driving and controlling the embroidery frame 7 and the needle N will be described.
As shown in FIG. 5, a central processing unit (hereinafter referred to as CPU) 21 loaded on a CPU board 20 constituting the embroidery sewing control means is used for selecting and editing an embroidery sewing pattern. There is a built-in ROM in which a pattern selection / editing program and a sewing machine control program for controlling the driving operation of the sewing machine based on the sewing data of the pattern selected / edited by the pattern editing / editing program are written. A pattern selection / editing means 22 and a sewing machine control means 23 are constituted by the built-in ROM and the arithmetic processing part similarly provided in the CPU 21.
[0022]
The CPU board 20 is loaded with an internal pattern storage means 24 comprising a built-in ROM storing sewing data relating to various patterns, and a card-type pattern storage means comprising a ROM card, RAM card, flash card or the like. A mounting portion 25 a for connecting the 25 is provided. The internal pattern storage unit 24 and the card type pattern storage unit 25 are connected to the above-described pattern selection / editing unit 22 of the CPU 21 through a data bus. Sewing data of a pattern selected and selected by the sewing machine operator from among the various stored patterns is read out to the pattern selection / editing means 22 side, and a saving operation for the flash memory 27 described later is executed. It has become.
[0023]
Note that a ROM card, a RAM card, a flash card, or the like as the card pattern storing means 25 is configured to be attached and detached so as to be inserted toward the mounting portion 25a on the sewing machine body side.
[0024]
The CPU board 20 is a RAM 26 for temporarily storing sewing data relating to various patterns read from the internal pattern storage means 24 or the card-type pattern storage means 25 and sewing data edited for the various patterns. In addition, a flash memory 27 is provided for storing and storing pattern data even when the power is turned off. The pattern storage operation described above is performed on the pattern storage area provided in the flash memory 27.
[0025]
The RAM 26 and the flash memory 27 are connected to the internal pattern storage unit 24 or the external pattern storage unit 25 by a data bus and to the above-described pattern selection / editing unit 22 of the CPU 21 by a data bus. ing.
[0026]
The pattern selection / editing means 22 has a function of calling sewing data of various patterns from the internal pattern storage means 24, the card-type pattern storage means 25, the RAM 26 and the flash memory 27 described above, and the various types of the called patterns. An edit function for changing the sewing data of the pattern in accordance with instructions from the sewing machine operator is provided. That is, the pattern selection / editing means 22 displays data on various patterns currently read out on the pattern display section 5a of the LCD display board 5 and also on the touch panel section 5b of the LCD display board 5. The pattern displayed on the pattern display unit 5a and the sewing data thereof are appropriately changed based on each instruction signal for pattern editing / combination instructed to the pattern selection / editing means 12 by operating the switch unit. Or they are configured to be combined.
[0027]
As described above, by operating the touch panel unit 5b as an input selection unit, sewing data for various patterns in the internal pattern storage unit 24, the card-type pattern storage unit 25, the RAM 26, and the flash memory 27 are arbitrarily selected. The pattern is appropriately edited or combined with other patterns, and the pattern changed by editing / combination is stored in the flash memory 27 as appropriate.
[0028]
On the other hand, various mechanical external switches 28 for turning on / off specific functions are connected to the input side of the sewing machine control means 23, and the start and stop of the sewing machine instructed through the external switches 28, In addition, a predetermined drive signal is issued from the sewing machine control means 23 to the drive circuit of the sewing machine motor 30 based on each thread cutting operation instruction.
[0029]
Further, a detection signal from a spindle angle detection device 32 composed of an encoder or the like that constantly detects the rotational position of the sewing machine spindle is input to the sewing machine control means 23, and the rotation speed of the sewing machine spindle is set. A speed setting signal is given from the speed setting means 31 constituted by the slide volume. A predetermined drive signal is issued from the sewing machine control means 23 to the driver circuit of the sewing machine motor 30 in accordance with the speed setting signal.
[0030]
Further, on the output side of the sewing machine control means 23, a driver for driving the X pulse motor 6b1 of the X drive unit 6b in the embroidery device 6 and a Y pulse motor 6c1 in the Y drive unit 6c are driven. The drivers are connected to each other, and based on the sewing data of the pattern selected by the sewing machine operator, the X driving unit 6b and the Y driving unit 6c are driven by a command signal issued from the sewing machine control means 13, and a predetermined X -Y feeding operation is performed.
[0031]
Further, in the sewing machine control means 23, a needle swing drive controller for controlling the operation of the needle swing mechanism described above is provided. A driver for driving the needle swing motor 13 in the above-described needle swing mechanism (see FIG. 4) is connected to the output side of the needle swing drive control unit at a predetermined timing corresponding to the rotation angle of the main shaft. The needle N is moved in the left-right direction (X direction) together with the needle bar 11 in response to a command signal issued from the sewing machine control means 23. That is, at least until the movement of the embroidery frame 7 is completed for each needle, for example, while the balance is pulling up the upper thread, the needle N is swung in a predetermined direction. The needle swinging direction at that time is set in a direction in which the needle N is separated from the thread path of the upper thread from the hook to the hole of the needle N with respect to the moving direction of the embroidery frame 7.
[0032]
Next, the operation procedure in such an embroidery sewing control means will be described.
First, in the main routine of embroidery sewing shown in FIG. 6, when the embroidery sewing operation is started, the amount of movement of the embroidery frame 7 to the next needle entry point based on the sewing data of the selected and read pattern Is calculated (step 1). When it is confirmed that the start / stop switch 28 is pressed (Yes in step 2), the driving of the sewing machine motor 30 is started (step 3).
[0033]
Next, the movement direction of the embroidery frame 7 is read (step 4). Of the movement amounts of the embroidery frame 7 calculated as described above, the movement amount Xd in the X direction (left-right direction) is zero or positive (Xd ≧ 0) (Yes in Step 5), it can be seen that there is a rightward movement, so the direction of the needle swing is set to the left (Step 6) and the X direction (left and right direction) of the embroidery frame 7 is set. If the movement amount Xd is negative (X <0) (No in Step 5), it is understood that there is a movement in the left direction, so the direction of swinging is set in the right direction (Step 7).
[0034]
When the rotational position φ of the spindle reaches the reference position 287 degrees (see FIG. 8) (Yes in step 8), the needle swinging operation is executed (step 9), and the process proceeds to FIG. The embroidery frame 7 is moved (step 10). The needle swinging operation in the present embodiment is swung about 0.5 mm at a timing while the balance is pulling up the upper thread while the needle N is rising. This needle swinging operation may be performed from the time when the needle N is removed from the sewing object until the embroidery frame 7 starts moving.
[0035]
When the frame movement for one stitch is completed in this way (Yes in step 11), the movement amount of the frame to the next next needle drop point is calculated (step 12), and the stop command by the start / stop switch is issued. If it is not applied (No in step 13), similar frame movement and needle swinging operations are repeated as indicated by symbol A. When the start / stop switch is further pressed and a stop command is issued (Yes in step 13), the sewing machine motor 30 is stopped (step 14), and the embroidery sewing operation is ended.
[0036]
As described above, according to the present embodiment, the embroidery sewing operation is performed while the needle N is separated from the thread path from the cloth to the needle hole by the needle swinging operation performed for each needle in the moving direction of the embroidery frame 7. As a result, such a thread avoiding operation of the needle N prevents the thread hook phenomenon of the needle tip, and the embroidery sewing operation is stably continued.
[0037]
The needle yarn avoiding operation by such a needle swinging operation is performed more reliably when the balance is pulling up the sewing thread as in the present embodiment.
[0038]
Although the embodiments of the invention made by the present inventor have been specifically described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. Not too long.
[0039]
For example, the needle may be swung to the left when the embroidery frame movement amount Xd = 0. Further, the determination of Xd = 0 in step 5 of this embodiment may be performed several stitches before or when a pattern is selected, and the needles may be swung when the stitches are formed.
[0040]
【The invention's effect】
As described above, according to the first aspect of the present invention, the needle swinging operation is performed so that the needle is separated from the thread path of the sewing thread from the cloth to the needle hole for each needle in the moving direction of the embroidery frame. By providing a swing control unit, it is configured to continue embroidery sewing while performing needle thread avoidance operation, thus preventing the needle thread hooking phenomenon well and preventing trouble such as thread breakage, needle breakage, etc. Thus, the embroidery sewing operation can be stably continued without causing the embroidery sewing machine to improve the reliability of the embroidery sewing machine.
[0041]
Further, as in the invention according to claim 2, by providing a needle swing control unit that performs a needle swing operation while the balance is pulling up the sewing thread, the needle thread avoiding operation is made more reliable, The effects described above can be further improved.
[Brief description of the drawings]
FIG. 1 is an explanatory front view showing an example of the overall configuration of an embroidery sewing machine to which the present invention is applied.
FIG. 2 is a schematic perspective view illustrating the internal structure of an embroidery apparatus to which the present invention is applied.
FIG. 3 is an explanatory perspective view illustrating the structure of an embroidery frame.
FIG. 4 is an explanatory side view showing an outline of a needle swing mechanism.
FIG. 5 is a block diagram showing the structure of an embroidery sewing control unit according to an embodiment of the present invention.
6 is a flowchart showing a main routine of an embroidery sewing operation procedure executed by the embroidery sewing control means according to FIG. 5. FIG.
7 is a flowchart showing the next step of the flow in FIG. 6. FIG.
FIG. 8 is a timing chart showing a relationship between frame movement and a needle swinging operation.
9A and 9B show a state of needle swinging, in which FIG. 9A is a front view showing a state of a thread when the needle is swung from side to side, and FIG. 9B is a plane explanatory view of the needle of FIG. (C) is side surface explanatory drawing of the needle | hook of (a).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sewing machine main body 5 LCD display board 6 Embroidery apparatus 6b X drive part 6c Y drive part 7 Embroidery frame 11 Needle bar N Needle 12 Swing stand 13 Needle swing motor 20 CPU board 21 Central processing unit (CPU)
22 pattern selection editing means 23 sewing machine control means 24 internal pattern storage means 30 sewing machine motor

Claims (2)

A needle that has a threading hole that penetrates in the horizontal direction in the vicinity of the needle tip and moves up and down in conjunction with a sewing machine drive source, and a needle swinging means that swings the needle in a direction perpendicular to the threading hole penetration direction A frame moving means for moving the embroidery frame in the XY direction while the needle is positioned in the cloth upper direction and a needle drop position for each pattern. Pattern storage means for storing pattern data to be selected, selection means for specifying and reading a desired pattern out of various patterns stored in the pattern storage means, and based on the pattern data read by the selection means In an embroidery sewing machine comprising: control means for controlling the frame driving means and the needle swinging means so as to change the needle drop position;
The control means swings the needle at the previous needle drop point before or during the movement of the embroidery frame when the movement direction of the embroidery frame to the next needle drop point is in the penetration direction of the threading hole. An embroidery sewing machine having a function of swinging in a direction away from a position. The embroidery sewing machine according to claim 1, wherein the swing drive control unit has a function of operating the needle swing mechanism while the balance pulls up the sewing thread.

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