JP5318900B2 - Buttonhole sewing machine - Google Patents

Description

  The present invention relates to a buttonhole overlock sewing machine for performing overlock sewing on a peripheral portion of a buttonhole.

Generally, a sewing machine (button hole sewing) that forms a buttonhole over stitch by forming a straight or so-called eyelet-shaped cut (button hole) on the cloth that is to be sewn and performing a series of over stitches around the button hole. Sewing machine) is known.
This sewing machine usually has a pair of cloth-cutting knifes and a knife receiver disposed at a position sandwiching the sewing product from above and below in order to form a button hole in the sewing product, and the sewing product is placed on the upper surface. A cloth feed base that can be moved to an arbitrary position in the horizontal plane, a cloth presser that moves the workpiece to be integrally moved with the cloth feed base, and the like.

As shown in FIG. 9, the cloth presser 100 includes a presser arm 101 and a presser foot 102 disposed on one end side of the presser arm. The other end of the presser arm 101 is connected to an air cylinder 105 below the cloth feed base 104 via a plurality of connecting members 103, and the presser foot 102 is moved substantially vertically by driving the air cylinder 105. The structure is movable.
Then, in a state where the workpiece is held on the cloth feed base 104 by the cloth presser 100, for example, either the knife receiver attached to the sewing machine arm side or the cloth cutting knife is changed to the other attached to the sewing machine main body side. By being lowered, the button hole is formed in the sewing product.
Recently, a buttonhole sewing machine having a configuration in which the knife receiver or the cloth cutting knife is driven by a motor such as a pulse motor instead of a conventional actuator such as a solenoid is also known.
Further, in a buttonhole sewing machine capable of forming a seam stitch around a buttonhole having a eyelet hole, when the seam stitch is formed around the eyelet part, the needle bar is rotated to form the seam stitch. A sewing machine is known. In such a sewing machine, when changing the sewing thread, this needle bar turning function is used to turn the needle so that the thread insertion direction of the needle hole is directed to the operator side. And the operator turns the needle when the sewing thread is changed by operating the operating means.

By the way, since the cloth presser is generally arranged at a position where the cloth cutting knife and the knife holder are sandwiched from both the left and right sides, when replacing the cloth cutting knife and the knife holder in accordance with the shape of the button hole to be formed, There is a problem that this cloth presser becomes an obstacle and reduces the efficiency of the replacement work.
In a sewing machine configured to drive the knife receiver or cloth cutting knife with the cloth cutting motor, the cloth cutting motor is energized also when the knife holder or cloth cutting knife in the raised position is attached or detached. Unless the cutting is cut, the knife receiver or the cloth cutting knife cannot be moved manually in order to confirm the mounting position, which also causes a reduction in the efficiency of the replacement work.
In addition, when replacing the sewing thread, in addition to passing the tip of the new sewing thread through the eye hole of the needle, the path leading from the thread piece to the needle while passing the sewing thread used so far through the needle hole of the sewing needle. Cut the upper part of the thread, for example, near the thread spool, tie this cut part and a new sewing thread, and pull the other end of the cut part of the thread that has been used so far, to bring the new thread into the eye hole of the needle. There is a method of changing the sewing thread through the thread. However, the conventional method of turning the needle bar that was performed when changing the sewing thread was only to turn the needle bar so that the thread insertion direction of the needle hole was directed to the operator side. However, when replacing the yarn by the latter method, it is necessary to pull the yarn in the direction opposite to that of the operator, and the workability is extremely poor.

  An object of the present invention is to provide a buttonhole sewing machine capable of improving the workability of buttonhole stitching in consideration of the above-described circumstances.

  In order to solve the above problem, the buttonhole sewing machine (20) according to claim 1 is movable in the vertical and horizontal directions with the needle bar (40) moving up and down while supporting the sewing needle (41). And a cloth presser (70) for pressing the vicinity of the sewing position of the sewing product in the lowered position, a turning means (turning motor 84) for turning the needle bar, and turning the needle bar when changing the sewing thread. In a buttonhole sewing machine having an operation means (exchange mode key 90d) for outputting a command signal for turning 180 ° by the means, the turning is performed so that the needle bar is turned 180 ° each time the operating means is operated. Control means (CPU 13) for controlling the means is provided.

  According to the present invention, when changing the sewing thread, the needle bar can be reversed 180 ° every time the operating means is operated, so that the needle can be directed in the direction corresponding to the thread changing method. Work can be done efficiently. In other words, when replacing the sewing thread by passing the tip of a new sewing thread through the needle hole, the thread insertion side of the needle hole can be directed toward the operator and threading can be performed. When replacing the sewing thread with a new thread, pull the thread so that the side opposite to the thread insertion side of the needle hole, that is, the side from which the thread to be pulled out is directed toward the operator. Can be easily replaced.

It is a principal part side view of the sewing machine concerning an embodiment. It is a principal part side view of the sewing machine concerning an embodiment. It is a principal part side view of the sewing machine concerning an embodiment. It is a principal part front view of the sewing machine concerning an embodiment. It is a block diagram which shows the structure of a sewing machine. It is drawing which shows an operation panel. It is a flowchart which shows the control method of a sewing machine. It is a flowchart which shows the control method of a sewing machine. It is a principal part side view which shows a general cloth presser and a cloth feed base.

Hereinafter, the buttonhole sewing machine 20 according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 4, in the following description, the vertical direction refers to the axial direction of the needle bar 40, the front-rear direction refers to the cloth feed direction, and the left-right direction refers to the front-rear direction in the horizontal plane. Refers to the orthogonal direction.

As shown in FIGS. 1 and 5, the boring machine 20 (hereinafter simply referred to as “sewing machine 20”) includes a sewing machine frame 30, a needle bar 40, a cloth cutting means 50, a feed base 60, a cloth presser 70, and various actuators. The control unit (control means) 10 is configured to control driving of various actuators of the drive unit 80.
The sewing machine frame 30 includes a bed portion 31 having a substantially rectangular box shape, a vertical trunk portion 32 standing upward from the rear side of the bed portion 31, a sewing arm 33 extending forward from the upper side of the vertical trunk portion 32, and the like. Outlined. A drive unit 80 (a spindle motor 81 described later) for driving various mechanisms (the needle bar 40, the cloth cutting means 50, the feed base 60, the cloth presser 70, etc.) constituting the sewing machine 20 is provided inside the sewing machine frame 30. , X-axis motor 82 and the like). Note that a specific driving method of various mechanisms by the driving unit 80 is a well-known technique, and a detailed description thereof will be omitted.

  The needle bar 40 is disposed along the vertical direction at the tip of the sewing machine arm 33, supports the sewing needle 41 at the lower end thereof, moves up and down integrally with the sewing needle 41, swings in the horizontal direction, and rotates around the axis. Can be rotated.

The cloth cutting means 50 is provided for forming a button hole in the cloth, and includes a knife receiver 51 as a movable member and a cloth cutting knife 52 as a fixed cloth cutting member.
The knife receiver 51 protrudes downward from the lower surface side of the sewing machine arm 33 and can be moved in the vertical direction by a cloth cutting motor 85 stored in the sewing machine arm 33.
A plurality of knife receivers 51 are prepared corresponding to the shape of the button hole to be formed, and can be attached to and detached from the sewing machine arm 33 side. Reference numeral 51 a denotes a mounting screw for mounting the female receiver 51.

  The cloth cutting knife 52 is disposed on the bed 31 so as to face the knife receiver 51. In a state where the cloth is arranged between the knife receiver 51 and the cloth cutting knife 52, the knife receiver 51 is moved downward and matched with the cloth cutting knife 52 to form a button hole having a predetermined shape on the cloth. it can.

The feed stand 60 is a device for moving the cloth to an arbitrary position in the front-rear and left-right directions with the cloth placed on the upper surface thereof.
The feed base 60 has a thin rectangular box and is connected to an X-axis motor 82 and a Y-axis motor 83, which will be described later, and the control device 10 moves to an arbitrary position by controlling the drive of these motors. As a result, a button hole can be formed at a predetermined position of the cloth placed on the feed base 60, and a buttonhole over stitch can be formed.
Further, on the upper surface of the feed base 60, a right feed plate 61 and a left feed plate 62 are arranged on the left and right sides with the axis of the sewing machine extending in the front-rear direction (the front-rear direction line passing through the vertical trajectory of the sewing needle 41) as the center. They are arranged symmetrically.

The cloth presser 70 includes a right cloth presser 71 and a left cloth presser 72, and is a member that presses the cloth against the feed base 60 with the right cloth presser 71 and the left cloth presser 72 and moves integrally with the feed base 60. In addition, since the right cloth presser 71 and the left cloth presser 72 are arranged opposite to each other about the axis of the sewing machine and have a symmetrical shape with respect to the axis, only the right cloth presser 71 is described in the following description. explain.
The right cloth presser 71 includes a presser arm 71a and a presser foot 71b.
The pressing arm 71 a is pivotally supported by a support portion 63 disposed on the feed base 60. A presser foot 71b, which is a substantially rectangular plate body, is pivotally supported at one end of the presser arm 71a, and the other end is disposed below the feed base 60 via a plurality of connecting members. Are connected to a cloth holding cylinder 86.

Therefore, by driving the cloth presser cylinder 86, the right cloth presser 71 can be rotated in a plane perpendicular to the cloth feed surface with the shaft 63a as the center.
In the state where the right cloth presser 71 is moved to the lowest side, that is, in the state where the presser arm 71a is rotated counterclockwise around the shaft 63a in FIG. 2, the upper surfaces of the presser foot 71b and the cloth feed base 60 are The right feed plate 61 is in contact with the right feed plate 61.
Since the cloth presser 70 has such a structure, it is possible to press the left and right sides of the part where the button hole of the cloth is formed when the button hole is formed, and it is formed when the button hole is sewn. It is possible to move together with the cloth feed base 60 in a state where the left and right sides of the button hole are pressed.

Next, the configuration of the control device 10 will be described with reference to the block diagram of FIG.
The control device 10 includes a ROM 11, a RAM 12, a CPU 13, and the like.
An operation panel 90, a press switch 91, and a start switch 92 are connected to the control device 10 via an interface (I / F) 14, and a spindle motor 81, an X-axis motor 82, a Y-axis motor 83, a swing motor (swing) (Means) 84, a cloth cutting motor (cloth cutting drive means) 85, a cloth pressing cylinder 86, and the like.

Further, between the interface 14 and the main shaft motor 81, the X-axis motor 82, the Y-axis motor 83, the turning motor 84, and the cloth cutting motor 85, a main shaft motor drive circuit 81a for driving each motor, an X-axis motor drive A circuit 82a, a Y-axis motor drive circuit 83a, a turning motor drive circuit 84a, and a cloth cutting motor drive circuit 85a are interposed, and a cloth presser cylinder drive electromagnetic valve 86a is interposed between the interface 14 and the cloth presser cylinder 86. .
The control device 10 also includes an X-axis origin sensor 82b for detecting the origin positions of the X-axis motor 82, the Y-axis motor 83, the turning motor 84, and the cloth cutting motor 85 via the interface 14, and a Y-axis origin sensor. 83b, a turning origin sensor 84b, and a cloth cutting origin sensor 85b are connected.

The ROM 11 stores a drive control program for controlling the drive of various actuators of the drive unit 80.
The RAM 12 stores a plurality of pattern data, which will be described later, corresponding to each preset sewing shape (sewing pattern). If the pattern data is changed on the operation panel 90, the RAM 12 stores the changed pattern data. Remember. Further, the RAM 12 temporarily stores data (seam data) relating to, for example, the cloth feed amount relating to the seam calculated by the CPU 13 based on the drive control program.
The pattern data refers to a series of setting data necessary for forming a buttonhole stitch such as a sewing length and the number of stitches. These data can be arbitrarily changed on the operation panel 90.

The CPU 13 calculates stitch data including a cloth feed amount and a needle turning amount at each needle drop point based on the set pattern data and the drive control program. Based on the stitch data, the drive of each motor and the like is controlled via each drive circuit.
Although not shown, the CPU 13 also performs drive control of other components of the sewing machine 20, such as thread trimming and loopers, and checks whether these components are operating normally.
On the operation panel 90, as shown in FIG. 6, a pattern number determined for each sewing pattern is selected, a pattern number operation unit 90a for displaying the pattern number, and pattern data of the selected sewing pattern is displayed. If necessary, the data operation unit 90b for changing the pattern data, the preparation key 90c for setting the various types of data related to buttonhole sewing, the exchange selected when the knife receiver 51 and the thread S are exchanged A mode key 90d is provided.

The press switch 91 is a switch selected when the cloth presser 70 is moved up and down.
The start switch 92 is a switch that is selected when buttonhole sewing is executed.
The spindle motor drive circuit 81a is provided to control the drive mechanism of the needle bar 40 and the looper by controlling the drive of the spindle motor 81. Since the spindle motor 81 is provided with a detector (not shown) for detecting the needle position, the feed base synchronized with the needle position based on the stitch data calculated by the CPU 13 as will be described later. It is possible to move 60 and turn the needle bar 40 and the looper.

The X-axis motor drive circuit 82a and the Y-axis motor drive circuit 83a control the drive of the X-axis motor 82 and the Y-axis motor 83, respectively, so that the X-axis direction (left-right direction) and Y-axis direction (front-rear direction) of the feed base 60 are controlled. ) To control movement.
The turning motor drive circuit 84a is provided to control the driving of the turning motor 84 in order to rotate the needle bar 40 and the looper when forming the seam radially, for example, the eyelet portion of the eyelet-punched seam. .
The cloth cutting motor drive circuit 85a is provided to move the knife receiver 51 up and down by controlling the driving of the cloth cutting motor 85. The cloth cutting motor drive circuit 85a receives the motor current off signal output from the CPU 13, and cuts off (off) the supply current to the cloth cutting motor 85. Thus, when the current to the cloth cutting motor 85 is interrupted, the knife receiver 51 connected to the cloth cutting motor 85 can be manually moved up and down.
The pulley 87 shown in FIGS. 1 to 4 is provided to move the knife receiver 51 up and down at this time. The pulley 87 is connected to the knife receiver 51 by a connection mechanism (not shown), and the supply current to the cloth cutting motor 85 is supplied. The knife receiver 51 can be moved up and down by turning it manually when it is shut off.

Next, a sewing machine control method by the control device 10 according to the present embodiment will be described with reference to the flowcharts of FIGS.
First, in the main routine shown in FIG. 7, various data necessary for buttonhole sewing are set by the pattern number operation unit 90a and the data operation unit 90b of the operation panel 90 (step S100).
Next, the operation of the preparation key 90c is monitored (step S101). In the case of Yes here, that is, when the preparation key 90c is turned on, the cloth presser 70 is lowered and comes into contact with the upper surface of the cloth feed base 60. (Step S102), the process proceeds to Step S103. In the case of No, the process returns to step S100, the data can be set again, and is in a standby state until the preparation key 90c is turned on.

In step S103, an origin search for detecting the origin positions of the cloth feed base 60, needle bar 40, looper, knife receiver 51, etc. is performed by each origin sensor.
In step S104, the feed table 60 is moved to a so-called set position set in front so that the cloth can be easily set on the feed table 60, and the cloth presser 70 is raised in step S105. In this state, as shown in FIG. 1, when the sewing machine 20 is viewed from the side, the knife receiver 51 is in the raised position, and the pressing arm 71a of the cloth presser 70 overlaps the knife receiver 51, particularly the mounting screw 51a. It has become.
In step S106, the operation of the exchange mode key 90d is monitored. If No, that is, if the exchange mode key 90d is not turned on and there is no need to replace the cloth cutting table or the sewing needle 41, the process proceeds to step S108. If Yes, that is, if the exchange mode key 90d is turned on, the process proceeds to the exchange mode subroutine shown in FIG. 8 (step S107).

In the exchange mode subroutine, as shown in FIG. 2, the cloth presser 70 is first lowered (step S200), the feed base 60 moves to the origin position set rearward, and the needle bar 40 and the looper are located at the origin position. Is turned about 180 ° around the axis (step S201), and the current of the cloth cutting motor 85 is turned off (step S202). Then, the operation of the exchange mode key 90d is monitored (step S203).
During this time, the operator replaces the sewing needle 41 and the sewing thread S together with the knife receiver 51. Since the current of the cloth cutting motor 85 is off, the knife receiver 51 in the raised position is manually moved up and down by manually turning the pulley 87, so that the mounting position or the cloth cutting position of the knife receiver 51 is set. Can be confirmed.
When the operator wants to turn the direction of the needle bar 40 again in order to correspond to the desired sewing thread changing method during the replacement operation, Yes, that is, the replacement mode key 90d is turned on in step S203. If the answer is No, that is, if it is not necessary to turn the direction of the needle bar 40, the exchange mode key 90d is not turned on, and the process proceeds to step S207.

In step S204, it is detected whether or not the needle bar 40 is at the origin position.
If Yes, that is, if the needle bar 40 is at the origin position, the needle bar 40 is turned about 180 ° about the axis (step S205). If No, that is, if the needle bar 40 is not at the origin position and is at a position rotated 180 °, the needle bar 40 is turned to the origin position (step S206) (see FIG. 3).
In this manner, every time the exchange mode key 90d is turned on in step S203, a command signal for reversing the needle bar 40 by approximately 180 ° is output, whereby the needle bar 40 is reversed by 180 °. And the yarn S can be exchanged promptly.

In step S207, the operation of the preparation key 90c is monitored. If NO, that is, if the preparation key 90c is not turned on, the process returns to step S203, and a standby state is entered until the preparation key 90c is turned on.
When Yes, that is, when the preparation key 90c is turned on, a current is supplied to the cloth cutting motor 85 (step S208), and a search for the origin position with respect to the knife receiver 51 after replacement is performed (step S209).
Then, the feed base 60 is moved again to the set position, and the needle bar 40 and the looper are turned to the origin position (step S210). In step S210, when the needle bar 40 and the looper are at the origin position, they are not turned.
Thereafter, by raising the cloth presser 70 (step S211), the exchange mode subroutine is completed, and the process returns to step S106.

As described above, if the answer is No in step S106, that is, if the exchange mode key 90d is not turned on, the operation of the press switch 91 is monitored in step S108. If No, that is, if the press switch 91 is not turned on, the process proceeds to step S106, and the process waits until the press switch 91 is turned on. If Yes, that is, if the press switch 91 is turned on, the cloth presser 70 is lowered. The cloth is pressed against the holding table (step S109). By this time, the cloth is set on the feed base 60 in the set position.
If it is desired to reset the cloth at this time, Yes in step S110, that is, the press switch 91 is turned on, the cloth presser 70 is raised (step S111), and the process returns to step S106.
In step S110, if No, that is, if the pressing switch 91 is not turned on, the operation of the start switch 92 is monitored (step S112).

If NO in step S112, that is, if the start switch 92 is not turned on, the process returns to step S110 and waits until the start switch 92 is turned on. If Yes, that is, if the start switch 92 is turned on, the knife receiver is received. 51 is lowered, buttonholes are formed in the cloth pressed against the feed base 60, buttonhole sewing is executed (step S113), and after completion of buttonhole sewing, the process proceeds to step S114.
In step S114, the feed base 60, the needle bar 40, the looper, etc. are present at the position when the buttonhole sewing is completed, so that the feed base 60 is moved to the set position and the needle bar 40 and the looper are moved to the origin. Move to position.
Then, the cloth presser 70 is raised (step S115), and the process returns to step S106.
Thus, a series of control by the sewing machine control device 10 is completed.

According to the buttonhole sewing machine 20 according to the present embodiment, when the knife receiver 51 is exchanged, the cloth presser 70 is moved downward, that is, when viewed from the side, by simply turning on the replacement mode key 90d. Moves to a position that does not overlap with the knife receiver 51, particularly the mounting screw 51a, and the feed table 60 moves to the origin position, and the cloth presser 70 disposed on the feed table 60 moves away from the knife receiver 51. . Accordingly, the cloth presser 70 does not get in the way when the knife receiver 51 is replaced, and the replacement work is facilitated.
Further, since the cloth presser 70 is lowered and moved to the origin position of the feed base 60, the cloth presser 70 is moved to a position away from the sewing needle 41, and the thread replacement work and the threading work are facilitated. .
Further, it is not necessary to provide a new device for moving the cloth presser 70, and the cloth presser 70 is separated from the knife receiver 51 by using a general feed base 60 provided in a normal buttonhole sewing machine. Can do. Therefore, the manufacturing cost of the sewing machine can be suppressed.

Further, when the exchange mode key 90d is turned on in the main routine, the needle bar 40 turns about 180 ° around the axis. Therefore, the operator who is normally located in front of the sewing machine 20 can pass the thread S from the front side when passing the thread S through the sewing needle 41, for example, and the thread replacement work is facilitated.
In addition, the needle bar 40 can be inverted about 180 ° around the axis every time the exchange mode key 90d is turned on in the exchange mode subroutine. Therefore, for example, when replacing the thread S, the thread S that has been used up to now is passed through the sewing needle 41, and for example, the vicinity of the thread spool on the path of the thread S is cut and cut. Even when the new thread S is passed through the sewing needle 41 by connecting the part and the end of the new thread S and pulling the other end of the cut part of the thread S used so far, for example, the sewing needle By turning 41 in a desired direction, the direction in which the sewing thread S is pulled can be easily pulled (in the direction of arrow A in FIG. 3), and the workability of the thread replacement work can be improved.

  Since the knife receiver 51 can be manually moved up and down by turning off the current of the cloth cutting motor 85, for example, by manually lowering the knife receiver 51 to a position close to the cloth cutting knife 52, The position can be confirmed, and the button hole can be formed with high accuracy.

In the present embodiment, the buttonhole sewing machine 20 includes the feed base 60 and the cloth presser 70 moves together with the feed base 60. However, the present invention is not limited to this, and the feed base 60 is not provided. Also good. In this case, when the knife receiver 51 is replaced, the cloth presser 70 moves downward, so that the workability of the replacement work can be improved.
In the present embodiment, the case where the knife receiver 51 as the movable member and the cloth cutting knife 52 as the fixed member are provided has been described. However, the present invention is not limited thereto, and the cloth cutting knife 52 as the movable member is provided. And a female receiver 51 as a fixing member may be disposed.

Each time the exchange mode key 90d is operated when the cloth presser 70 is lowered when the knife receiver 51 is replaced and the feed base 60 moves to the origin position or when the energization to the cloth cutting motor 85 is cut off. The needle bar 40 is inverted 180 °. However, the present invention is not limited to this. Each time the exchange mode key 90d is operated without interrupting the movement of the cloth presser 70 and the feed base 60 and the energization of the cloth cutting motor 85. The needle bar 40 may be reversed only 180 °.
In addition, when the knife holder 51 is replaced, the cloth presser 70 is lowered and the feed base 60 is further moved to the origin position. However, the present invention is not limited to this. For example, the cloth presser 70 and the feed base 60 do not move. When the current of the cloth cutting motor 85 is turned off, the knife receiver 51 may be manually moved up and down, or may have a structure capable of turning the needle bar 40 at this time.
Further, in the buttonhole sewing machine according to the present invention, the order of buttonhole sewing is not limited. In other words, it does not matter whether a so-called point knife that forms a button hole in the cloth and then forms a button hole after applying a button stitch to a predetermined place on the cloth after the button hole is formed. .
The control method of the buttonhole sewing machine 20 by the control device 10 is not limited to that shown in the embodiment of the invention, and can be changed within the scope of the gist of the present invention.

10 Control means (CPU)
20 buttonhole sewing machine 33 sewing machine arm 40 needle bar 41 sewing needle 50 cloth cutting means 51 knife receiver 52 cloth cutting knife 60 feed base 70 cloth presser 82 X-axis motor 83 Y-axis motor 84 turning means (turning motor)
85 Cloth cutting drive means (Cloth cutting motor)
86 Material presser cylinder 90d Operating means (replacement mode key)

Claims (1)

A needle bar that moves up and down while supporting the sewing needle, a cloth presser that is movable in the vertical and horizontal directions, presses the vicinity of the sewing position of the sewing product in the lowered position, and swivels that rotate the needle bar And a buttonhole sewing machine having an operation means for outputting a command signal for turning the needle bar by about 180 ° by the turning means when changing the sewing thread,
A buttonhole sewing machine comprising control means for controlling the turning means so as to invert the needle bar approximately 180 ° each time the operating means is operated.

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