JP2783978B2 - Buttonhole sewing machine drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for a buttonhole sewing machine. 2. Description of the Related Art As shown in FIG. 5, a buttonhole sewing machine is a sewing machine for forming a stitch around the buttonhole 104 as shown in FIG. In order to form such a stitch, sewing is not performed from A to B, and the cloth feed base of the sewing machine is rapidly fed in the Y direction. Next, during the period from B to G, the cloth feed table is intermittently fed at a predetermined pitch, and sewing is performed while the needle bar is swung in a direction perpendicular to the periphery of the button hole 104. At this time, C ~
During the interval F, the cloth feed table is fed not only in the Y direction but also in the X direction.
During the period from to E, the needle bar (not shown) is further rotated in addition to the XY directions to perform the sewing, thereby obtaining the illustrated sewing. [0005] As described above, in the buttonhole overlocking machine, it is necessary to move the cloth feed base of the sewing machine in the Y direction by rapid feed and intermittent feed, and to feed the cloth feed base in the X direction according to the shape of the buttonhole. FIG. 6 is a conceptual view of a conventional example of a mechanism for moving the cloth feed table in the XY directions. In the figure, 8 is a main cam having a main cam groove 8a formed therein, and 21 is a pattern cam having a pattern cam groove (not shown) formed therein. The two cams 8 and 21 move the cloth feed table in the Y and X directions, respectively, via members (not shown) fitted into the respective cam grooves. The motor 6 connected to the electrical box 1
6 rotates, pulley 68, belt 69, pulley 7
0, shaft 74, pulley 76, pulley 8 via belt 78
0 rotates. The rotation of the motor 66 is controlled by the pulley 7
2, transmitted to the belt 86 and the pulley 88. Pulley 80
An electromagnetic clutch 82 is provided between the shaft 56 and the main shaft 56, and an electromagnetic clutch 84 is provided between the pulley 88 and the sewing machine shaft 64. At first, the electromagnetic clutch 82 connects the pulley 80 to the main shaft 56, and the electromagnetic clutch 84 releases the connection between the pulley 88 and the sewing machine shaft 64. Accordingly, the motor 66 rotates the main shaft 56 via the pulley 80. As a result, the cloth feed table of the sewing machine rapidly moves in the Y direction from A to B in FIG. The electromagnetic clutches 82 and 84 at the position B in FIG.
Is switched, the connection between the main shaft 56 and the pulley 80 is released, and the sewing machine shaft 64 and the pulley 88 are connected. As a result, the motor 66 rotates the sewing machine shaft 64 via the pulley 88. When the sewing machine shaft 64 rotates, the sewing machine head 14
Starts operation and feed cam 15, feed bifurcated 1
6. The main shaft 56 is rotated by the feed arm 18 via the feed fork link 17. Since a one-way clutch 90 is provided between the feed arm 18 and the main shaft 56, the main shaft 56 intermittently moves every rotation of the pulley 88. Thus, the worm 7 rotates intermittently, the main cam 8 rotates, and the cloth feed base is intermittently fed in the Y direction. The main shaft 5
With the rotation of 6, the pattern cam 21 rotates via the X-axis worm 19, and moves the cloth feed table in the X direction according to the shape of the cam groove of the pattern cam 21. In the above-mentioned prior art, the transmission of the rotational force from one motor is performed in order to realize the rapid feed and the intermittent feed by alternately driving the main shaft 56 and the sewing machine shaft 64. Is switched by two electromagnetic clutches 82 and 84. However, electromagnetic clutches are expensive and costly. Further, the structure becomes complicated. Therefore, an object of the present invention is to reduce the cost,
An object of the present invention is to provide a driving device for a buttonhole sewing machine having a simple structure. According to the present invention, there is provided a cloth feed stand on which a workpiece is placed, and a bobbin feeder.
Adjust the cloth feed base to Y to form a buttonhole
Main cam for moving in X direction and moving in X direction
Feed control means having a pattern cam for
In the drive device for a buttonhole sewing machine, the main
A first rotating shaft for rotating the cam and the pattern cam;
A first motor for driving one rotary shaft and a sewing machine
A second rotating shaft, and a second motor for driving the second rotating shaft.
An intermittent drive means for intermittently rotating the first rotary shaft in one direction using the second rotary shaft as a drive source; and a second motor for driving the first motor during rapid feed of the cloth feed table. The first motor is stopped at the time of intermittent feed, and the second motor is stopped.
Of motor - to achieve control means for driving the motor, and the. When the cloth feed table is fast-forwarded, the first motor is driven and the second motor is stopped. The first motor
Are driven. Therefore, the cloth feed table is moved in the Y direction by the Y driving means. When the cloth feed base is intermittently fed, the first mode
The motor is stopped and the second motor is driven. The second rotating shaft is rotated by the second motor, and the first rotating shaft is intermittently rotated in only one direction by the intermittent driving means. Therefore, the cloth feed table is intermittently moved in the Y direction by the Y driving means. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual view of a driving device for a buttonhole holing machine according to the present embodiment, FIG. 2 is a perspective view including a rapid feed mechanism portion and an X feed mechanism portion of the present embodiment, and FIG. 3 is intermittent feed of the present embodiment. It is a partial perspective view of a mechanism part. First, based on FIG. 1 and FIG.
The feed mechanism and the X feed mechanism will be described. In these figures, 14 is the sewing machine head, and 8 is one rotation of FIG.
A main cam for controlling the Y direction between A and H is shown on the right side of the sewing machine head 14 in FIG. 1, but is actually provided below the sewing machine head 14. A main cam groove 8a is formed in the main cam 8, and the cloth feed table 10 is moved in the Y direction in FIG. 5 according to the shape of the main cam groove 8a by rotation of the main cam 8 as described later. A main shaft 56 (first rotation shaft) is provided below the main cam 8. A guide rod 50 is fixed to the cloth feed base 10, and the guide rod 50 slides in a guide groove (not shown) formed in the sewing machine head 14 to move the cloth feed base 10 in the XY directions. It is possible to move to. Below the guide rod 50 of the cloth feed base 10, the cloth feed base shaft 9 is fixed. The lower end of the cloth feed base shaft 9 is connected to the cam groove 8a of the main cam 8 disposed below the cloth feed base 10.
Is fitted inside. The cloth feed base 10 is also formed with a groove 54. The worm 7, the main cam 8, and the cloth feed shaft 9 constitute Y driving means. The worm 7 and the X-axis worm 19 are fixed near the center of the main shaft 56, and the feed arm 18 is provided at one end.
A pulley 6 is fixed to the other end. The worm 7 meshes with a gear formed on the outer periphery of the main cam 8. Reference numeral 21 denotes one rotation to control the X direction of A to H in FIG.
In Nkamu its axis - pattern for performing control (pattern - Nkamu shaft) 5
The X-axis gear 20 fixed to 8 meshes with the X-axis worm 19. The pattern cam 21 has a pattern cam groove 21a. The pattern cam shaft 58 further includes a disk 9 to be detected.
An origin detection sensor composed of a detector 2 and a detector 94 is provided. This sensor is for detecting the rotational position of the pattern cam 21. Reference numeral 62 denotes an X-axis link provided at one end with a protruding portion fitted into the pattern cam groove 21a, and at the other end provided with an X-axis square bead 22 fitted into the groove 54 of the cloth feed base 10. Have been. The X-axis worm 19, the X-axis gear 20, the pattern cam 21, and the X-axis link 62 constitute X driving means. The rotation of the main shaft 56 rotates the pulley 40 via the pulley 36 and the belt 38. The encoder 27 detects the rotational position of the main shaft via the pulley 40. Reference numeral 1 denotes an electric equipment box,
2, a foot pedal 28, a fast-forward motor 2 (first motor), and a sewing machine rotation motor 3 (second motor) are connected to the electronic component box 1. In the electrical box 1, an inverter circuit capable of controlling both the fast-forward motor 2 and the sewing machine rotating motor 3 is provided. The control means 110 drives the fast-forward motor 2 to stop the sewing machine rotation motor 3 when the cloth feed table 10 is fast-forwarded, and conversely, stops the fast-feed motor 2 and drives the sewing machine rotation motor 3 during intermittent feeding. . When the foot pedal 28 is pressed, the electrical box 1
Starts the fast-forward motor 2. When the fast-forward motor 2 rotates, the main shaft 56 rotates via the sewing machine 4, the belt 5, and the pulley 6. As a result, the cloth feed table 10 of the sewing machine rapidly moves in the Y direction from A to B in FIG. 5 via the worm 7 and the main cam 8. In the section between B and G in FIG.
0 needs to be controlled to move in the X and Y directions.
In addition to the movement control in the tenth Y direction of the cloth feed by the main cam 8 described above, the cloth feed table 10 is moved in the X direction by the X-axis square burrs 22 by the pattern cam 21. Next, the intermittent feed mechanism of this embodiment will be described with reference to FIGS. In these figures, a pulley 13 and a feed triangular cam 15 are fixed to a sewing machine shaft 64 (second rotation shaft). Feed triangular cam 15
Is fitted to the fork of the feed fork 16, and the feed fork 1
A feed bifurcated arm 16B is fixed to 6. A feed arm 18 is fixed to the tip of the main shaft 56, and this feed arm 18 is connected to a feed fork arm 16B of the feed fork 16 via a feed fork link 17. When the sewing machine rotating motor 3 rotates, the sewing machine shaft 64 is driven through the pulley 11, the belt 12, and the pulley 13.
Rotates. By the rotation of the sewing machine shaft 64, the feed fork 16 swings around the shaft 16C via the feed triangular cam 15, so that the feed fork arm 16B and the feed fork link 17 swing up and down. Since the one-way clutch 90 is provided between the feed arm 18 and the main shaft 56 as described above, the main shaft 56 is intermittently moved via the feed arm 18 and the one-way clutch 90 by the vertical swinging movement of the feed bifurcated link 17. Rotate. Accordingly, the main cam 8 is rotated by the worm 7, and the cloth feed base 10 is intermittently driven. This intermittent feed is performed as shown in FIG.
To G. Incidentally, the feed triangular cam 15, the feed bifurcation 16,
The feed bifurcated link 17, the feed arm 18, and the one-way clutch 90 constitute intermittent drive means. Reference numeral 106 denotes a main spindle brake for preventing the main spindle 56 from overrunning when the main arm 56 is intermittently fed by the feed arm 18. Reference numeral 108 denotes a main cam brake for preventing the main cam 8 from overrunning. 110 is a rotation position detecting device for the sewing machine shaft 64. A method of performing drilling in the embodiment having the above configuration will be described. The positions A and H in FIG. 5 can be detected, for example, by detecting the position of the cloth feed table 10 using a limit switch (not shown). Also, BG
Is determined, for example, by detecting the rotational position of the main shaft 56 by the encoder 27. When the foot pedal 28 is pressed, the electrical equipment box 1
As a result, the fast-forward motor 2 is rotated, and the main shaft 56 is rotated via the sewing machine 4, the belt 5, and the pulley 6. By this rotation, the main cam 8 and the pattern cam 21 rotate, and the cloth feed base shaft 9 and the cloth feed base 10 rapidly move in the Y direction from A to B in FIG. 5 along the shape of the main cam groove 8a. The rotational force of the sewing machine rotating motor 3 starts the operation of the sewing machine head 14 via the pulley 11, the belt 12, the pulley 13, and the sewing machine shaft 64. At the same time, the rotation of the feed triangular cam 15 causes the feed fork 16, the feed fork link 17 and the feed arm 18 to swing, respectively, and the one-way clutch 90 rotates the worm 7 and the main cam 8 intermittently. Feed shaft 9 and cloth feed bar 1
0 causes intermittent motion in the Y direction at a predetermined pitch. In the section between C and F in FIG.
Therefore, in addition to the movement control of the cloth feed table 10 in the Y direction by the main cam 8 described above, the pattern cam 21 is rotated by the worm 19 for the X axis, and the link 62 for the X axis is controlled. The cloth feed base 10 is moved in the X direction by the X-axis square sesame 22. Further, in the section between D and E in FIG.
8 needs to be swiveled. . For this reason, as shown in FIG. 4, a cam groove 8b is provided on the back surface of the main cam 8, and the projection 100 is fitted into the cam groove 8b.
The needle bar 98 is swiveled through 2. After completing the intermittent feed in the section from B to G,
Sewing machine rotation motor 3 stops at
Are turned on, and the motor returns to the origin by the rapid feed of G to H, thereby completing a series of basic operations. Although the driving device of the buttonhole sewing machine according to the present invention has been described based on the embodiment, the present invention is not limited to this embodiment and can be variously modified. According to the present invention, a first rotating shaft (main shaft 56) and a second rotating shaft (sewing shaft 6) are formed by using two motors.
Since the driving of 4) is alternately performed to realize fast-forward and intermittent-feed, there is no need to use an electromagnetic clutch.
Accordingly, there is provided a driving device for a buttonhole sewing machine which is inexpensive and has a simple structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conceptual diagram of one embodiment of a drive device for a buttonhole holing machine according to the present invention. FIG. 2 is a perspective view including a Y feed mechanism portion and an X feed mechanism portion of the present embodiment. FIG. 3 is a partial perspective view of an intermittent feed mechanism of the embodiment. FIG. 4 is a perspective view of the needle bar turning mechanism of the present embodiment. FIG. 5 is a plan view of a buttonhole sewn by the buttonhole overlocking machine. FIG. 6 is a schematic diagram of a conventional example of a mechanism for moving a cloth feed base in XY directions. [Description of Signs] 1 Electrical box 2 Fast-forward motor (first motor) 3 Motor for rotating sewing machine (second motor) 7 Worm 8 Main cam 8a, 8b Cam groove 10 Cloth feed Table 14 Sewing machine head 21 Pattern cam 21a Cam groove 56 Main shaft (first rotating shaft) 64 Sewing machine shaft (second rotating shaft) 90 One-way clutch (intermittent driving means) 112 Control means

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideki Yoshinobu 8-2, Kokuryo-cho, Chofu-shi, Tokyo Jury Co., Ltd. Examiner Masato Matsunawa (56) Reference JP-A-54-106348 (JP, A) JP-A-2-59778 (JP, U) JP-A-1-12709 (JP, Y2) JP-B-61-9876 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) D05B 3/08 D05B 69/14 D05B 19/00-19/16

Claims (1)

(57) [Claims] A cloth feed base on which a workpiece is placed and the cloth feed base so as to form a buttonhole buttonhole seam.
Main cam for moving in Y direction and moving in X direction
Feed control means having a pattern cam for
In the driving device of the buttonhole sewing machine, the first rotation for rotating the main cam and the pattern cam is performed.
Shaft, a first motor driving a first rotation shaft, a second rotation shaft driving a sewing machine, a second motor driving a second rotation shaft, and a second rotation. and intermittent drive means for rotating intermittently the first rotation axis shaft as a drive source in one direction, the at the fabric feed base fast forward first motor - drive the motor second mode - to stop the motor And a control means for stopping the first motor and driving the second motor at the time of intermittent feed, and a control device for driving the buttonhole sewing machine.