JPS6022925Y2 - Switching device in buttonhole - Google Patents

Description

[Detailed description of the invention] This invention has an operating plate on the sewing machine bed that has a cloth attachment part and can move forward and backward and left and right, and a cam shaft and a rotating shaft that rotate in conjunction with the sewing machine. A rotary cam member that transmits only lateral movement to the actuating plate is attached to the camshaft, and a cam member drive gear fixed to the rotating shaft has an elliptical inner part of the advancing/retracting cam member that conveys only forward and backward movement to the actuating plate. Regarding a button holer in which teeth are engaged and the actuating plate is moved from side to side by a cam member only when sewing both ends of the buttonhole, in particular, cams are provided above and below the rotary cam member to move the actuating plate from side to side only when sewing both ends of the buttonhole. The present invention provides a switching device which can sew any buttonhole by moving it left and right by any cam of a cam groove provided on the upper and lower cams.

Details of the attachment button holer implementing this invention will be explained below based on the attached drawings.

In addition, the right side of FIGS. 1 and 2 will be described as the front, the left side as the rear, the upper side of FIG. 2 as the left, and the lower side as the right.

In the figure, reference numeral 1 denotes a board, on which a mounting frame 2 is fixed, and a vertical cam shaft 3 is rotatably mounted on this mounting frame 2.

A gear 4 is fixed to the lower part of the camshaft 3, so that when the board 1 is fixed on the sewing machine bed B, the gear 4 meshes with a gear 6 on a drive shaft 5 provided on the bed.

Further, a gear 9 at the upper end of a vertical rotating shaft 8 rotatably attached to the right side of the frame 2 is fixed to a gear 10 to the camshaft 3.
mesh.

Reference numeral 11 denotes a reciprocating cam member, and an elongated cam recess 13 having elongated inner teeth 12 as shown in FIG. Projection 14
An arcuate guide groove 15 is formed between the inner teeth 12 and the inner teeth 12.

A cam member drive gear 16 at the lower end of the rotating shaft 8 is engaged with the internal teeth 12 of the cam member 11, and a center pin 17 that engages with the arcuate guide groove 15 is provided on the lower center surface of the gear 16.

Reference numeral 18 denotes a horizontal movement plate mounted between the substrate 1 and the mounting frame 2 by horizontally elongated holes and pins so as to be able to slide left and right, and the guide groove 20 of the cam member 11 can freely slide on the upward guide rail 19 on the right side. This lateral movement plate 18 is urged to the right by a spring (not shown), that is, in the direction of the arrow in FIGS. 4 and 6.

Reference numeral 21 denotes an advance/retreat plate superimposed on the lower side of the transverse motion plate 18, and is
It is attached so that it can slide back and forth using a long hole and a pin.

Further, the retaining piece 22 on the right side of the front portion of the reciprocating plate 21 is slidably engaged with the guide groove 23 in the left and right direction on the lower side of the cam member 11, as shown in FIG.

Reference numeral 24 denotes a movable frame which is attached to the right side attachment portion of the attachment frame 2 by screws so as to move forward and backward within a certain range, and a sliding frame 25 is attached to this frame 24 so as to be able to freely slide back and forth.

The upper part of the sliding frame 25 slides into contact with the lower side of the size setting table 26 formed on the upper part of the movable frame 24 through a side opening, and is inserted into the insertion hole of the movable receiving piece 27 which slides on the setting table 26. By inserting the fixing screw 28 into the long hole provided in the setting table 26 and screwing it into the screw hole of the sliding frame 25, when the screw 28 is loosened, the sliding frame 25 moves back and forth together with the receiving piece 27, and the screw 2
When 8 is tightened, the frame 25 is attached to the setting table 2 together with the receiving piece 27.
A receiving piece 29 is also fixed to the front end of the setting table 26, and a hot spring 30 is sandwiched between both receiving pieces 27 and 29 to set the size.

The lower end of the sliding frame 25 is bent below the guide frame 24 as an IJ IJ-strip 31 as shown in the bottom view of FIG. Make sure that the release piece 31 touches it.

Reference numerals 33 and 34 denote two levers that are swingably attached to the front right side of the board 1 with a vertical shaft 35.

The outer end of the upper lever 33 fits into a window-like engagement portion 36 on the front side of the movable frame 24, and a pin 37 is provided on the inner end.

The lower lever 34 is a fixing means for the transversely moving plate 18, and its outer end is also fitted into the engaging portion 36, and the downwardly directed retaining piece 38 at the inner end is used to lock the transversely moving plate 18, as shown in FIG. When the plate 18 moves to the left, it fits into an engagement notch 39 provided on its front side, and the inner ends of both levers 33 and 34 are pulled toward the rear camshaft 3 by a spring. .

A rook 40 is fixed to the lower surface of the gear 10 above the camshaft 3.

A rotary cam member 41 is attached to the lower side of the rook 40 so as to be rotatable about the shaft 3.

A keyhole cam 42 and a regular cam 43 are provided above and below this cam member 41.

44 in Figures 2 and 6 is a shaft 5 attached to the upper left side of the mounting frame 2.
2, a regular/keyhole switching lever 45 is attached to the left side of the rotating frame 44 so as to be swingable by a horizontal shaft 46, and a horizontal piece 4 at the rear end of this switching lever 45 is attached.
7 is inserted between the cams 42t43 as shown in FIG. 3, and above and below the cam grooves 48.
Attach the pins 50 and 51 that engage with the lever 49 and
When the front end of the lever 45 is pushed down, the pin 50 engages with the cam groove 48, and when the front end of the lever 45 is pushed up, the pin 51 engages with the cam groove 49.

In addition, a fixing device is provided to prevent the switching lever 45 from moving due to vibration or the like when the switching lever 45 is turned up or down in this manner.

That is, in the illustrated example, the base of the leaf spring 53 disposed outside the switching lever 45 is connected to the shaft 46, and the lever 4 is connected to the shaft 46 as shown in FIG.
A pair of engagement holes 54 are fixed to the swing frame 44 by fixing screws 45' which are loosely fitted into the arcuate elongated holes of No. The levers 45 are provided above and below, and the levers 45 are fixed by engagement between the projections 53' and the engagement holes 54.

The pin 57 on the lower front end of the lower piece of the rotating frame 44 is connected to the actuating plate 59.
It is engaged with the elongated hole 60 in the front-rear direction at the front end of.

As shown in FIG. 2, a pin 55 on the base plate 1 is engaged with a longitudinal hole 60 provided in the middle of the actuating plate 59, and the actuating plate 59 rotates left and right around this pin 55. , and be able to advance and retreat.

The two-pronged engagement portion 56 on the rear left side of the advancing/retracting plate 21 is inserted with an appropriate amount of play between the receiving piece 58 whose left end is fixed on the actuating plate 59 and the actuating plate 59 as shown in FIG. Also, the pin 61 provided on the lower side of the receiving piece 58 and the engaging portion 56 are engaged with each other.

As shown in FIG. 6, a claw 62 is rotatably attached to the cam part 41 by a pin 63, and is biased in the direction of engagement with the rook 40 by a spring (not shown). When the end comes into contact with the pin 37 of the lever 33, the claw 62
It is arranged so that the rook comes off from the rook 40.

Reference numeral 64 in FIG. 6 denotes a rocking piece rotatably mounted on the mounting frame 2 with a shaft 65 at the rear of the cam member 41. A pin 66 is fixed to the top and bottom of one end of the rocking piece, and the upper part of the rocking piece is attached to the claw 62. A spring 67 is attached to the other end so as to be in contact with the rear end, and to apply rotational force to the swinging piece 64 to bias the pin 66 in the direction of the cam member 41 .

Reference numeral 68 in FIG. 6 is a lever rotatably mounted on the frame 2 by a shaft 69. One end of this lever 68 is in contact with the lower part of the pin 66 of the swinging piece 64, and the other end is formed downward. The retaining piece 70 fits into the recess 71 on the upper right side when the cam member 11 moves to the right side.

A cloth attachment part 72 is provided at the rear end of the actuating plate 59, and an elliptical opening lower part 3 which is long in the front-rear direction is provided at the center thereof.

A swing frame 75 that swings up and down about a horizontal shaft 74 is provided on the side of the cloth mounting portion 72, and a cloth presser mounting frame 77 is swingably mounted to the end of the swing frame 75 by a horizontal shaft 76.

Further, at the ends of the arms 78 on the front and rear sides of this frame 77,
A presser foot 79 having an opening that coincides with that is rotatably mounted on a front and rear shaft 80.

Reference numeral 81 indicates the operating plates 5 located on both sides of the swing frame 75.
A presser cam 83 is rotatably mounted between the upper ends of both support pieces 81 by means of a horizontal shaft 82.

The attachment button holer A in which this invention was implemented has the above-mentioned structure, and the board 1 is removably fixed on the bed B of the sewing machine by screws or other means as shown in FIGS. 3 and 4, and the gear 4 is mesh with gear 6 on the sewing machine bed,
Set the needle so that it descends into the open lower part 3 of the cloth attachment part 72 of the actuating plate 59 of the attachment A.

Next, the presser cam 83 is raised as shown by the chain line in FIG. 1 to lift the cloth presser frame 79 above the cloth attachment part 72, and after inserting the desired fabric between these positions, the presser cam 83 is tilted down as shown by the solid line in FIG. The outer periphery of the cam 83 presses down the swing frame 75 and strongly pinches the cloth between the cloth presser frame 79 and the cloth attachment part 72.

Further, as shown in FIG. 1, a desired button 30 is placed on the size setting table 26, the button 30 is held between the receiving pieces 27 and 29, and the receiving piece 27 is fixed on the setting table 26 with the fixing screw 28.

Further, when the actuating plate 59 is set to the most advanced starting position using a suitable knob (not shown), the pin 17 of the gear 16 is placed in the center of the arcuate guide groove 15 of the cam member 11 as shown in FIG. To position.

On the other hand, when the sewing machine is set at the center base line and the swing width is set to a width suitable for buttonholes and the waist feed dog is lowered to the inoperative position, the needle will just create a stitch of a constant width between the start marks 84 of the open lower part 3 shown in Fig. 2. It will be in the state of making.

Furthermore, the lever 45 is operated to engage either the upper or lower pins 50, 51 of the horizontal piece 47 with any of the cam grooves 48 and 49.

When the sewing machine starts operating in this way, the needle (not shown) moves up and down to create a stitch in the fabric held between the fabric attachment part 72 and the fabric presser frame 79, and the operating plate 59 moves to move the fabric. Edge the buttonhole.

That is, when the sewing machine is operated, the gear 6.4 is turned and the gear 6.10 is driven as shown by the arrow in FIG.

Therefore, the gear 16 also rotates within the cam member 11, but since the pin 17 of the gear 16 is initially within the guide groove 15 of the cam member 11, as the gear 16 rotates, the cam member 11 moves the guide groove 15 along the pin 17. At the same time, the cam member 11 moves from left to right in FIG. 8 while performing an arcuate motion as indicated by the arrow in FIG.

For this reason, the guide rail 19 is engaged with the guide groove 20 on the lower side of the cam member 11.

The lateral movement plate 18 also moves in the same way, and the notch 3 provided in the lateral movement plate 18
At 9, the engagement piece 38 of the lever 34 engages to regulate the horizontal movement of the horizontal motion plate 18.

At this time, the gear 16 meshes with the right side (the left side in FIG. 8) of the internal teeth 12 of the cam member 11, as shown in FIG. 8H, and then moves the cam member 11 rearward as the sewing machine moves.

The cam member 11 has a guide groove 23 on its lower side as shown in FIG.
Since the engagement piece 22 of the advance/retreat plate 21 is engaged with the cam member 11, when the cam member 11 retreats in the direction of the arrow, the advance/retreat plate 21 also retreats.

When the advancing/retracting plate 21 retreats, the actuating plate 59 having the pin 61 that engages with the two-pronged engaging portion 56 also retreats.

On the other hand, at the start position, the pawl 62 on the cam member 41 engages with the rook 40 as shown in FIG. 9I, and the rook 40 and the cam member 41 rotate together.

At this time, pin 5 of the switching lever 45 attached to the rotating frame 44
0 or 51 is moved by the cam groove 48 or 49, the rotating frame 44 rotates around the shaft 52, and pins the actuating plate 59 through the pin 57 at its front end and the elongated hole 60. It rotates around 55.

When the cam member 41 rotates by a predetermined angle, the rear end of the pawl 62 moves to the ninth position.
As shown in Figure H, the pawl 62 comes into contact with and is stopped by the pin 37 of the lever 33, and is removed from the rook 40, the cam member 41 stops, and only the gear 9 continues to rotate.

That is, when the pawl 62 leaves the rook 40, the eighth
As shown in Figure H, the gear 16 meshes with the right side (left side in Figure 8) of the internal teeth of the cam member 11.

In this way, the actuating plate 59 rotates as it retreats, and the cloth attachment portion 7
Move the cloth No. 2 to edge the rear end right a (right side in FIG. 10) of the buttonhole 86 in FIG.

When the sewing machine continues to operate, the cam member 11 moves rearward due to the rotation of the gear 16 meshing with the right side of the internal teeth 12, and the advance/retreat plate 21 also moves along with this, causing the actuating plate 59 to move rearward.

During this time, since the rotating frame 44 does not move, the actuating plate 59 performs a linear movement to create a seam allowance for the left linear portion of the buttonhole 86.

When the straight part is edged by the length set by the button 30, the protrusion 32 on the lower side of the cam member 11 moves the IJ IJ-strip 31 integral with the sliding frame 25 as shown by the arrow in FIG. push.

Therefore, the sliding frame 25 moves together with the movable frame 24, and its retaining part 36 first pushes the outer end of the lever 33, and the pin 37 at the inner end comes off the rear end of the claw 62 as shown in FIG. 62
is engaged with the rook 40 by a spring and rotates the cam member 41 together with the rook 40, so that the rotating frame 44 is rotated via the pin 50 or 51 that is engaged with the cam groove 48 or 49 of the cam member 41. When the engaging portion 36 moves along the shape of the cam groove 48 or 49 and reaches a position where the front left side C of the buttonhole 86 is edged in an arc shape, the engaging portion 36 pushes the outer end of the lever 34, so that the inner end of the lever 34 The engagement piece 38 disengages from the engagement notch 39 of the transverse movement plate 18 and moves to the right by the spring.The left side (right side in FIG. 8) of the internal teeth 12 of the cam member 11, which has moved along with this, meshes with the gear 6. Therefore, after that, cam member 1
1 starts moving forward, and the reciprocating member 21 moves forward through the engagement between the guide groove 23 and the engagement piece 22, and moves the actuating plate 59 forward. As a result, the right side d of the front end of the buttonhole 86 is shaped like an arc.

When the cam member 41 rotates by a predetermined angle, the rear end of the pawl 62 hits the pin 66 as shown in FIG. Only the cam member 11 moves forward, and the right side e of the buttonhole is sewn, but the left side C and the right side d
When making the seam allowance, when the pin 50 is engaged with the cam groove 48, the buttonhole 86 becomes a keyhole as shown by the chain line in FIG. 10, and when the pin 51 is engaged with the cam groove 49, the buttonhole 86 becomes regular.

As described above, when the cam member 11 is moved to the right by the spring from the position shown in FIG.

Therefore, when the cam member 11 moves forward and the left side of the buttonhole is brought into contact with the predetermined long edge, the end of the recess 71 of the cam member 11 pushes the engagement piece 70 and rotates the lever 68.

Therefore, the lever 68 pushes the lower end of the pin 66 of the swing piece 64 outward, so the upper end of the pin 66 comes off the rear end of the pawl 62, and the pawl 62 is engaged with the rook 40 by the spring as shown in FIG. Then, the cam member 41 starts rotating again.

When the cam member 41 starts rotating as described above, the actuating plate 59
begins to rotate, and due to the forward motion of the actuating plate 59 by the advancing/retracting plate 18, the front left side f of the buttonhole is edged in an arc shape, the cam member 11 returns to the starting position, and the seam allowance of the buttonhole ends. .

The buttonhole that implemented this idea is as shown above on the board 1.
A reciprocating cam member 11 having oval internal teeth 12 is provided on the top, and this is moved forward and backward by a gear 16 that rotates with the movement of the sewing machine, thereby moving the actuating plate 59 forward and backward.
The lateral rotational movement of the actuating plate 59 is performed by the rotary cam member 41, which rotates with the movement of the sewing machine, so the longitudinal direction of the buttonhole is controlled by the advancement/retraction cam member 11, and the width direction is controlled by the forward/backward cam member 11. This is done using a rotating cam member 41, but in this invention, cams 42 and 43 are provided above and below the rotating cam member 41, and in the case of the embodiment, the seam allowance can be freely set for either the keyhole buttonhole or the regular buttonhole. It was made so that it could be done.

That is, in this invention, when the switching lever 45 is switched up or down, the pin 50 or 51 at the end of the switching lever 45 moves into the cam groove 4.
8 or 49 to create a seam allowance for a desired buttonhole according to its shape, it is very convenient and allows buttonhole selection to be made very easily.

[Brief explanation of the drawing]

Figure 1 is a right side view of an attachment button holer implementing this invention, Figure 2 is a plan view of the same as above, Figure 3 is a partially longitudinal front view, Figure 4 is a longitudinal rear view, and Figure 5 is the left side. 6 is a partial cross-sectional plan view of the main part, Fig. 7 is a bottom view of the main part seen through the board, Fig. 8 is an explanatory diagram of the operation of the advancing/retracting cam member, and Fig. 9 is a diagram of the rook and pawl. FIG. 10 is an explanatory diagram of the buttonhole rim order. 3...Camshaft, 8...Rotation shaft, 11.
・Curved forward/backward cam member, 12... Oval internal teeth, 16
...Curved cam member drive gear, 41... Rotating cam member, 42. Curved keyhole cam, 43... Regular cam, 44... Rotating frame, 45.・・・・・・
・Switching lever, 48.49・Cam groove, 50.51・
... Zen, 59 ... Actuation plate, 72 ...
...Fabric attachment part, B... Sewing machine bed.

Claims (1)

[Scope of utility model registration request] On the sewing machine bed, there is provided an actuation plate that has a fabric attachment part and can move forward and backward and left and right, and a camshaft and a rotating shaft that rotate in conjunction with the sewing machine, and the camshaft runs transversely to the actuation plate. A rotary cam member for transmitting movement is rotatably mounted, a cam member drive gear is fixed to the rotating shaft, and the drive gear is engaged with the oval internal teeth of the forward/backward cam member for transmitting forward/backward movement to the actuating plate; means for coupling the rotary cam member to the cam shaft when the advancing/retracting cam member comes to the sewing position at the end of the buttonhole; In the buttonhole machine, the switching lever is swingably attached to a rotating frame that swings in conjunction with the actuating plate. ,
The rotary cam member is provided with a cam in which a plurality of cam grooves are formed for sewing the ends of buttonholes having different end shapes, and the switching lever is provided with a cam formed with a plurality of cam grooves for sewing the ends of buttonholes having different end shapes. A switching device for a button holer equipped with a pin that engages with either of the buttons.